The important supporting component in a gas turbine is the casing,which has the characteristics of large size,complex structure,and thin wall.In the context of existing 3DP sand casting processes,casting crack defects...The important supporting component in a gas turbine is the casing,which has the characteristics of large size,complex structure,and thin wall.In the context of existing 3DP sand casting processes,casting crack defects are prone to occur.This leads to an increase in the scrap rate of casings,causing significant resource wastage.Additionally,the presence of cracks poses a significant safety hazard after the casings are put into service.The generation of different types of crack defects in stainless steel casings is closely related to casting stress and the high-temperature concession of the sand mold.Therefore,the types and causes of cracks in stainless steel casing products,based on their structural characteristics,were systematically analyzed.Various sand molds with different internal topology designs were printed using the 3DP technology to investigate the impact of sand mold structures on high-temperature concession.The optimal sand mold structure was used to cast casings,and the crack suppression effect was verified by analyzing its eddy current testing results.The experimental results indicate that the skeleton structure has an excellent effect on suppressing cracks in the casing.This research holds important theoretical and engineering significance in improving the quality of casing castings and reducing production costs.展开更多
AIM:To investigate the efficacy and safety of Honghua preserved amniotic membrane(AM)for preventing scar formation of the filtering bleb in a rabbit model of glaucoma trabeculectomy surgery.METHODS:Totally 36 rabbits(...AIM:To investigate the efficacy and safety of Honghua preserved amniotic membrane(AM)for preventing scar formation of the filtering bleb in a rabbit model of glaucoma trabeculectomy surgery.METHODS:Totally 36 rabbits(36 eyes)were randomly divided into 3 groups:the experimental group(ocular trabeculectomy in combination with Honghua preserved AM transplantation),the control group(ocular trabeculectomy surgery in combination with AM implantation),and the blank group(single trabeculectomy).Clinical observations[including intraocular pressure(IOP),filtering blebs and complications],MassonTrichrome staining,real-time quantitative reverse transcription-polymerase chain reaction(real-time PCR),Western blot were performed on different time points(D1,D7,D14,D21 and D56)after the surgery.RESULTS:After operated for 14d,there were statistically significant differences in the filtering blebs compared to the situation before operation(P【0.05),whereas no statistically difference on that among three groups(P】0.05).After 21d,the IOP of experimental group was lowest(P【0.05).There was significant difference between control group and blank group(P【0.05).On postoperative D14,the mean number of fibroblasts in the experimental group was significantlylower(40.6±10.2)compared to those in the control group(54.4±10.8)and blank group(68.2±11.6)(P【0.05,respectively).The mean numbers of the macrophage in the experimental and control groups were respcitively significantly lower versus the blank group(P【0.05,P【0.05,respectively).Compared to that in blank group,the level of transforming growth factor-β(TGF-β1)expression in sclera and conjunctival areas was reduced in the experimental and control groups on protein and mRNA level(P【0.05),but not significant difference between these two groups(P】0.05).CONCLUSION:The trabeculectory surgery with Honghua preserved AM can control IOP,sustain the functional filtration bleb,inhibit the proliferation of fibroblasts and open the filtrating pathway on the rabbit glaucoma models.展开更多
·AIM:To compare the efficacy and safety of intravitreal aflibercept with dexamethasone implant in the treatment of macular edema(ME)associated with diabetic retinopathy(DR)or retinal vein occlusion(RVO).·MET...·AIM:To compare the efficacy and safety of intravitreal aflibercept with dexamethasone implant in the treatment of macular edema(ME)associated with diabetic retinopathy(DR)or retinal vein occlusion(RVO).·METHODS:A comprehensive search of studies comparing dexamethasone and aflibercept in patients with ME was conducted at PubMed,Embase,and Cochrane Central Register of Controlled Trials from the beginning of library to April 16,2021.Extracting the data including bestcorrected visual acuity(BCVA),central retinal thickness(CRT),number of injections and serious adverse events(SAEs)from the final qualified articles.RevMan 5.3 software was used for Meta-analysis of the included studies.·RESULTS:Totally 7 studies with 369 eyes were included.The causes of ME in the final screening study included RVO and DR.Compared with the aflibercept treatment group,the BCVA of the dexamethasone implant treatment group showed no significant difference in the follow-up for 3 mo[mean difference(MD):-0.05,95%confidence interval(CI):-0.11,0.02;P=0.17]and 12 mo(MD:-0.01,95%CI:-0.38,0.37;P=0.98),but it was slightly worse than the aflibercept group at 6 mo(MD:0.12.95%CI:0.03,0.21;P=0.008).In terms of CRT reduction,there was no significant difference between the two groups at 3 mo(MD:-28.14,95%CI:-79.95,23.67;P=0.29),6 mo(MD:27.67,95%CI:-84.89,140.24;P=0.63),and 12 mo(MD:-59.00,95%CI:-127.37,9.37;P=0.09).However,dexamethasone implant had fewer injections,but more adverse events such as elevated intraocular pressure(IOP)and cataract.·CONCLUSION:Intravitreal injection of aflibercept and dexamethasone implant can both effectively increase BCVA and reduce CRT.Compared with aflibercept,dexamethasone implant is not inferior in improving vision and reducing CRT in the initial treatment period(3 mo)and long-term treatment period(12 mo).Besides,it has fewer injections and more likely to cause elevated IOP and cataract.展开更多
AIM:To quantitatively detect aqueous levels of angiopoietin-like(ANGPTL)3,ANGPTL4,and ANGPTL6 and investigate their correlation with optical coherence tomography angiography(OCTA)findings in patients with diabetic mac...AIM:To quantitatively detect aqueous levels of angiopoietin-like(ANGPTL)3,ANGPTL4,and ANGPTL6 and investigate their correlation with optical coherence tomography angiography(OCTA)findings in patients with diabetic macular edema(DME).METHODS:This cross-sectional study included 23 patients(27 eyes)with type 2 diabetes and 16 control subjects(20 eyes).All patients underwent OCTA imaging and ultra-wide field fundus photography.Diabetic patients were categorized into two groups according to the presence or absence of diabetic retinopathy(DME group,14 patients,16 eyes);and non-diabetic retinopathy(NDR)group,9 patients,11 eyes,respectively.Aqueous levels of ANGPTL3,ANGPTL4,and ANGPTL6 were assessed using suspension array technology,and foveal-centered 3×3 mm2 OCTA scans were automatically graded to determine the central,inner,and full vessel density(CVD,IVD,FVD);central,inner,and full perfusion density(CPD,IPD,FPD),foveal avascular zone(FAZ)area,FAZ perimeter,and FAZ circularity index(FAZ-CI)on superficial capillary plexuses.Additionally,central subfield thickness(CST),cube volume(CV),and cube average thickness(CAT)were measured in a model of macular cube 512×128.RESULTS:Aqueous ANGPTL3 levels were not significantly different among the three groups(P>0.05).ANGPTL4 levels were significantly higher in the DME group than the control and NDR groups(P<0.0001 and P<0.001),while ANGPTL6 levels were significantly higher in the DME group than the control group(P<0.05).In the whole cohort,the aqueous ANGPTL3 levels correlated negatively with the IVD,FVD,IPD,and FPD,and positively with the CV and CAT.The aqueous ANGPTL4 levels correlated negatively with the CVD,IVD,FVD,CPD,IPD,and FPD,and positively with the FAZ perimeter,CST,CV,and CAT.The aqueous ANGPTL6 levels correlated negatively with the IVD,FVD,IPD,FPD,FAZCI and positively with CST,CV,CAT.CONCLUSION:ANGPTL4 and ANGPTL6 may be associated with vascular leakage in DME and may represent good targets for DME therapy.In addition,OCTA metrics may be useful for evaluating macular ischemia in DME.展开更多
AIMTo investigate the expression of transcription factors Slug in human lens epithelial cells (HLECs) undergoing epithelial-mesenchymal transition (EMT) induced by connective tissue growth factor (CTGF).METHODSHLECs w...AIMTo investigate the expression of transcription factors Slug in human lens epithelial cells (HLECs) undergoing epithelial-mesenchymal transition (EMT) induced by connective tissue growth factor (CTGF).METHODSHLECs were treated with CTGF of different concentrations (20, 50 and 100 ng/mL) or without CTGF (control) for 24h. The morphological changes of HLECs were analysed by microscopy. The expression and cellular localization of Slug was evaluated by immumo-fluorescence. Expressions of Slug, E-cadherin and alpha smooth muscle actin (α-SMA) were further determined by Western blot analysis.RESULTSHLECs showed spidle fibrolasts-like characteristics and loosely connected each other after CTGF treatment. The immuno-fluorescence staining indicated that Slug was localized in the nuclei and its expression was induced by CTGF. The relative expressions of Slug protein were 1.64±0.11, 1.96 ±0.03, 3.12 ±0.10, and 4.08±0.14, respectively, in response to control group and treatment with CTGF of 20, 50 and 100 ng/mL (F=443.86, P<0.01). The increased Slug protein levels were correlated well with up-expression of α-SMA (0.78±0.05, 0.85±0.06, 2.17±0.15, 2.86±0.10; F=449.85, P<0.01) and down-expression of E-cadherin (2.50±0.11, 1.79±0.26, 1.05±0.14, 0.63±0.08; F=101.55, P<0.01).CONCLUSIONTranscription factor Slug may be involved in EMT of HLECs induced by CTGF in vitro.展开更多
AIM:To investigate whether inhibition of acetylcholinesterase(AChE)by donepezil ameliorate aberrant retinal neovascularization(RNV)and abnormal glial activation in oxygen-induced retinopathy(OIR).METHODS:A mouse model...AIM:To investigate whether inhibition of acetylcholinesterase(AChE)by donepezil ameliorate aberrant retinal neovascularization(RNV)and abnormal glial activation in oxygen-induced retinopathy(OIR).METHODS:A mouse model of RNV was induced in postnatal day 7(P7)mice by exposure to 75%oxygen.Donepezil was administrated to P12 mice by intraperitoneal injection.Expression and localization of AChE in mouse retinas were determined by immunofluorescence.RNV was evaluated by paraffin sectioning and hematoxylin and eosin(HE)staining.Activation of retinal M uller glial cells were examined by immunoblot of glial fibrillary acidic protein(GFAP).rMC-1.a retinal Muller cell line,was used for in vitro study.Expression of hypoxia-induced factor 1α(HIF-1α)and vascular endothelial growth factor(VEGF)were determined by Western-blot analysis,enzyme-linked immunosorbent assay(ELISA)or immunostaining.RESULTS:Aberrant RNV and glial activation was observed after OIR.Of note,retinal AChE was mainly expressed by retinal Muller glial cells and markedly increased in OIR mice.Systemic administration of donepezil significantly reduced RNV and abnormal glial activation in mice with OIR.Moreover,ischemia-induced HIF-1αaccumulation and VEGF upregulation in OIR mouse retinas and cultured rMC-1 were significantly inhibited by donepezil intervention.CONCLUSION:AchE is implicated in RNV with OIR.Inhibition of AChE by donepeizl is likely to be a potential therapeutic approach for retinal neovascular diseases.展开更多
Text event mining,as an indispensable method of text mining processing,has attracted the extensive attention of researchers.A modeling method for knowledge graph of events based on mutual information among neighbor do...Text event mining,as an indispensable method of text mining processing,has attracted the extensive attention of researchers.A modeling method for knowledge graph of events based on mutual information among neighbor domains and sparse representation is proposed in this paper,i.e.UKGE-MS.Specifically,UKGE-MS can improve the existing text mining technology's ability of understanding and discovering high-dimensional unmarked information,and solves the problems of traditional unsupervised feature selection methods,which only focus on selecting features from a global perspective and ignoring the impact of local connection of samples.Firstly,considering the influence of local information of samples in feature correlation evaluation,a feature clustering algorithm based on average neighborhood mutual information is proposed,and the feature clusters with certain event correlation are obtained;Secondly,an unsupervised feature selection method based on the high-order correlation of multi-dimensional statistical data is designed by combining the dimension reduction advantage of local linear embedding algorithm and the feature selection ability of sparse representation,so as to enhance the generalization ability of the selected feature items.Finally,the events knowledge graph is constructed by means of sparse representation and l1 norm.Extensive experiments are carried out on five real datasets and synthetic datasets,and the UKGE-MS are compared with five corresponding algorithms.The experimental results show that UKGE-MS is better than the traditional method in event clustering and feature selection,and has some advantages over other methods in text event recognition and discovery.展开更多
AIM:To investigate the effectiveness of a modified inferior oblique muscle belly transposition for treatment of V-pattern exotropia combined with mild to moderate inferior oblique muscle overaction.METHODS:Thirteen ca...AIM:To investigate the effectiveness of a modified inferior oblique muscle belly transposition for treatment of V-pattern exotropia combined with mild to moderate inferior oblique muscle overaction.METHODS:Thirteen cases(23 affected eyes)of V-pattern exotropia with inferior oblique muscle overaction(+or++)who underwent the modified inferior oblique muscle belly transposition procedure were retrospectively reviewed.The amount of V-pattern,grade of inferior oblique overaction,degree of vertical strabismus,abnormal head posture,and the fovea-disc angle were evaluated before and after surgery.RESULTS:The V-pattern was corrected in all cases,and the amount of V-pattern reduced by 17.85±5.13 prism diopter(PD)on average(t=16.07,P<0.001).The surgical cure rate for mild to moderate inferior oblique muscle overaction was 87.0%(20/23).The degree of the foveadisc angle has a mean reduction of 5.45°±2.87°(t=3.95,P=0.003)after surgery.The mean vertical deviation in 5 cases with a small-angle hypertropia(5.23±3.06 PD)in the primary position reduced by 3.15±1.86 PD(t=6.10,P<0.001).No serious complications were observed.CONCLUSION:The modified inferior oblique muscle belly transposition procedure can effectively treat mild to moderate inferior oblique overaction and relieve the V-pattern,which is safe and easy to perform.展开更多
AIM:To compare the dif ferences of choroidal neovascularization(CNV)measurements between sweptsource and spectral-domain optical coherence tomography angiography(SS-OCTA and SD-OCTA)in neovascular agerelated macular d...AIM:To compare the dif ferences of choroidal neovascularization(CNV)measurements between sweptsource and spectral-domain optical coherence tomography angiography(SS-OCTA and SD-OCTA)in neovascular agerelated macular degeneration(nAMD)and the imaging reliability of the two devices.METHODS:Prospective comparative study.SS-OCTA and SD-OCTA were used to scan the same eye with the modes of 3×3 and 6×6 mm2 centered on the neovascularization.Only qualified images were chosen and the border of CNV was manually delineated by two graders independently.The area of CNV(ACNV),vascular perfusion density(PD),and vessel length density(VLD)within the delineation were calculated using Image J.The differences of CNV measurements between the two OCTA devices were compared using Bland-Altman analysis.The agreement between the two graders on the measurements of each device was compared using the intraclass correlation coefficient(ICC).RESULTS:A total of 18 patients(22 eyes)with nAMD were included.The measurements of ACNV,PD,and VLD were 7.247±4.586 and 4.901±3.741 mm^(2),43.202±9.636 and 34.904±10.489,6.339±1.228 and 5.908±1.741 mm^(-1) for SS-OCTA and SD-OCTA,respectively.The differences between the two devices were 2.346±3.030 mm^(2)(Z=-3.782,P<0.0001),8.298±14.160(Z=-2.419,P=0.016),and 0.431±2.114 mm^(-1)(Z=-0.828,P=0.408)for ACNV,PD and VLD,respectively.The ICC between two graders were 0.893(P<0.001),0.902(P<0.001),0.885(P<0.001)for ACNV,PD,VLD in SS-OCTA,and 0.971(P<0.001),0.976(P<0.001),0.973(P<0.001)in SD-OCTA,respectively.CONCLUSION:Both OCTA devices have high imaging reliability.Compared with SD-OCTA,SS-OCTA has a larger ACNV measurements,but doesn’t show better resolution of internal vessels of CNV and well signal strength.展开更多
目的:评价改良折叠式人工晶状体(IOL)悬吊治疗外伤性晶状体脱位的手术技术。方法:前瞻性随机对照研究。共15例患者接受了改良折叠式IOL悬吊手术。其中,9例患者选择了Akreos AO IOL,使用聚丙烯缝线穿过IOL的环状襻,经巩膜引导穿刺后,缝...目的:评价改良折叠式人工晶状体(IOL)悬吊治疗外伤性晶状体脱位的手术技术。方法:前瞻性随机对照研究。共15例患者接受了改良折叠式IOL悬吊手术。其中,9例患者选择了Akreos AO IOL,使用聚丙烯缝线穿过IOL的环状襻,经巩膜引导穿刺后,缝合线末端热膨胀固定在巩膜。6例患者选择了Tecnis ZA9003 IOL,未使用缝合线,巩膜穿刺引导IOL襻穿出巩膜后,直接将IOL襻末端热膨胀固定在巩膜内。观察所有患者的最佳矫正视力(BCVA,LogMAR)及术后并发症。结果:研究共纳入15例患者,其中男7例,女8例,平均年龄64.00±9.85岁,平均病程5.80±3.17wk。人口统计学和基线临床特征之间没有显著差异。接受改良折叠式IOL悬吊手术后,所有患者视力均有明显改善。术后3mo,患者的BCVA(LogMAR)从1.28±0.56改善至0.52±0.30。其中,选择Akreos AO IOL患者的BCVA(LogMAR)从1.39±0.62改善至0.59±0.25,选择Tecnis ZA9003 IOL患者的BCVA(LogMAR)从1.12±0.45改善至0.42±0.35。此外,在我们的研究中没有观察到严重的术后并发症。仅1例患者IOL脱位,IOL光学面轻度倾斜。结论:改良折叠式IOL悬吊手术具有良好的视觉效果和预后,无严重并发症,是IOL悬吊手术的有效选择。展开更多
AIM： To compare a trifocal intraocular lens （IOL） and a bifocal IOL implantation in improving visual function after cataract surgery. METHODS： Eligible literatures were systematically searched through EMBASE and P...AIM： To compare a trifocal intraocular lens （IOL） and a bifocal IOL implantation in improving visual function after cataract surgery. METHODS： Eligible literatures were systematically searched through EMBASE and PubMed databases. The inclusion criteria were prospective comparative clinical trials on cataract surgery comparing trifocal IOL with bifocal IOL implantation that assessed visual acuity, contrast sensitivity and subjective vision quality. The effects were computed as standardized mean differences and pooled using fixed-effect or random-effect models. RESULTS： Four prospective randomized controlled trials （RCTs） and five cohorts provided data were included by a systematic review, comprising 265 eyes implanted with trifocal IOLs and 264 eyes implanted with bifocal IOLs. Monocular distance visual acuity （VA） showed a statistically significant but small difference that favored trifocal IOLs （MD=.0.06; 95%CI, -0.10 to -0.02; Z=2.90, P=0.004 for uncorrected distance VA, and MD- -0.02; 95%CI, -0.03 to .0.00; Z=2.02, P=0.04 for corrected distance VA）, but the data did not suggest that the effect of trifocal IOL implantation would clinically outperform bifocal IOL implantation. There was no significant difference in monocular near VA （MD=.0.01; 95%CI, -0.07 to 0.04; Z=0.42, P=-0.68 for distance-corrected near VA, and MD=-0.01; 95%CI, -0.06 to 0.03; Z=0.55, P=0.58 for corrected near VA） or refraction between two groups. Contrast sensitivity and subjective visual quality had no conclusive results. CONCLUSION： All results indicate that trifocal IOL and bifocal IOL had similar levels of monocular distance and near VA.展开更多
AIM：To investigate whether curcumin suppressed corneal neovascularization（CNV） formation via inhibiting activation of Wnt/β-catenin pathway.METHODS：Suture-induced CNV was established on Sprague-Dawley（SD） rats....AIM：To investigate whether curcumin suppressed corneal neovascularization（CNV） formation via inhibiting activation of Wnt/β-catenin pathway.METHODS：Suture-induced CNV was established on Sprague-Dawley（SD） rats.Curcumin were daily administrated by subconjunctival injection.Phosphorylation of low-density lipoprotein receptor-related protein 6（LRP6） and nuclear accumulation of β-catenin,two indicators of activated Wnt/β-catenin pathway,were determined by Western-blot analysis in subconfl uent/proliferating human microvascular endothelial cells（HMEC） and neovascularized corneas.Wnt3 a conditioned medium（WCM） were harvested from Wnt3 a expressing cells.WCM-induced cell proliferation and endothelial tubular formation capacity was measured by MTT assay and Matrigel assay,respectively.RESULTS：Phosphorylation of LRP6 and nuclear accumulation of β-catenin was significantly increased in subconfluent/proliferating endothelial cells.Activation of Wnt/β-catenin pathway by WCM markedly promotes HMEC proliferation and tubular formation.Curcumin inhibited LRP6 phosphorylation and nuclear accumulation of β-catenin.In addition,curcumin attenuated WCM-induced HMEC proliferation and disrupted tubular structure of endothelial cells on Matrigel.Meanwhile curcumin suppressed suture-induced CNV and inhibited LRP6 phosphorylation as well as β-catenin accumulation in SD rats.CONCLUSION：Taken together,activation of Wnt/β-catenin pathway could be involved in endothelial proliferation during suture-induced CNV formation and curcumin attenuated CNV formation via inhibition of Wnt/β-catenin pathway activation.展开更多
AIM: To analyze whether wet-lab training(WLT) or surgical-simulator training(SST) is better for ophthalmology residents to master the chopping technique.METHODS: Sixty ophthalmology residents(in their second year) and...AIM: To analyze whether wet-lab training(WLT) or surgical-simulator training(SST) is better for ophthalmology residents to master the chopping technique.METHODS: Sixty ophthalmology residents(in their second year) and three cataract surgeons participated in the study. The residents were randomly separated into two groups, WLT group and SST group. The residents in WLT group were asked to perform 10 trials of chopping using pig eyes and scored by the surgeons, and then they performed and scored using simulator for one time. The residents in SST group underwent 10 trials of chopping using simulator, and the simulator scored each trail. Then, this group were asked to perform the chopping using pig eyes and scored by the surgeons. At last, we investigated the residents’ satisfaction about the training.RESULTS: The demographic characteristics had no significant differences between the two groups. Recorded by the simulator, the residents in SST group got significantly higher overall score(83.90±1.31) than WLT group(78.73±1.92, P=0.03). And the residents in SST group got less corner area injured, and they spend less time than WLT group(P<0.05). Moreover, the residents in WLT group used more ultrasonic energy value than SST group(P=0.03). However, scored by the surgeons, the residents in two groups got nearly the same overall score. The residents in WLT group performed better on the frequencies of posterior capsule torn and incisional stress(P=0.03, 0.008, respectively). In the survey, the residents in two groups held the same opinion that the training was helpful and they strongly recommended this training. And all of them enjoyed the training, and enjoyed being randomized in their own group. However, with respect to the realistic character, the residents thought that WLT was better than SST(P<0.001).CONCLUSION: Both of the Eyesi surgical-stimulator and the wet-lab improve the residents’ chopping ability and each has its own advantages. The combination of the two training ways could be considered to be a part of the training curriculum for new residents.展开更多
The absorption spectrum of the cyclotrime-thylenetrinitramine （RDX） with four different particle sizes are measured in the frequency range from 0.1THz to 2.5THz by using the terahertz time-domain spectroscopy （THz-...The absorption spectrum of the cyclotrime-thylenetrinitramine （RDX） with four different particle sizes are measured in the frequency range from 0.1THz to 2.5THz by using the terahertz time-domain spectroscopy （THz-TDS）, and the characteristic absorption peaks are acquired. All the samples are measured in a loose condition, which is very close to the real using environment of the RDX. The results show that the four kinds of samples have similar absorption peaks around the frequency of 0.82THz, 1.05 THz, 1.30THz, 1.46THz, 1.65THz, and 1.95THz. The sample with a large particle size obtains more peaks than the small one, while the peaks obtained from the sample with a small size are more protrudent. The reasons for these differences can be the refraction, scattering, and attenuation of the terahertz wave when it passes through the crystal samples. The theoretical terahertz spectrum of RDX was simulated by using density functional calculations, in which, the Becke ＆amp; Perdew-Wang＇s functional is used in a double numerical plus polarization method （BP/DNP）. Good agreements between the experimental and computed results show that the three peaks located in the frequency of 1.30THz, 1.48THz, and 1.96THz are caused respectively by the twisting of three-nitrogen heterocyclic, the symmetrical oscillations of the double nitro groups, and the oscillations of a single nitro group.展开更多
基金financially supported by the National Natural Science Foundation of China(No.52175352)the Xing Liao Ying Cai Project of Liaoning Province(No.XLYC2008036)the Shenyang Youth Innovation Talent Support Program(No.RC220429)。
文摘The important supporting component in a gas turbine is the casing,which has the characteristics of large size,complex structure,and thin wall.In the context of existing 3DP sand casting processes,casting crack defects are prone to occur.This leads to an increase in the scrap rate of casings,causing significant resource wastage.Additionally,the presence of cracks poses a significant safety hazard after the casings are put into service.The generation of different types of crack defects in stainless steel casings is closely related to casting stress and the high-temperature concession of the sand mold.Therefore,the types and causes of cracks in stainless steel casing products,based on their structural characteristics,were systematically analyzed.Various sand molds with different internal topology designs were printed using the 3DP technology to investigate the impact of sand mold structures on high-temperature concession.The optimal sand mold structure was used to cast casings,and the crack suppression effect was verified by analyzing its eddy current testing results.The experimental results indicate that the skeleton structure has an excellent effect on suppressing cracks in the casing.This research holds important theoretical and engineering significance in improving the quality of casing castings and reducing production costs.
基金Supported by the National Natural Science Foundation of China(No.81160118)Clinical Medicine Research Special-purpose Foundation of China(No.L2012052)+3 种基金Science and Technology Foundation of Jiangxi Province(No.20111BBG70026-2)Jiangxi Province Youth Science Foundation(No.20114BAB215036)Science and Technology Platform Construction Project of Jiangxi Province(No.2013-116)Health Department Tradition Chinese Medicine Science and Technology Foundation(No.2012A087)
文摘AIM:To investigate the efficacy and safety of Honghua preserved amniotic membrane(AM)for preventing scar formation of the filtering bleb in a rabbit model of glaucoma trabeculectomy surgery.METHODS:Totally 36 rabbits(36 eyes)were randomly divided into 3 groups:the experimental group(ocular trabeculectomy in combination with Honghua preserved AM transplantation),the control group(ocular trabeculectomy surgery in combination with AM implantation),and the blank group(single trabeculectomy).Clinical observations[including intraocular pressure(IOP),filtering blebs and complications],MassonTrichrome staining,real-time quantitative reverse transcription-polymerase chain reaction(real-time PCR),Western blot were performed on different time points(D1,D7,D14,D21 and D56)after the surgery.RESULTS:After operated for 14d,there were statistically significant differences in the filtering blebs compared to the situation before operation(P【0.05),whereas no statistically difference on that among three groups(P】0.05).After 21d,the IOP of experimental group was lowest(P【0.05).There was significant difference between control group and blank group(P【0.05).On postoperative D14,the mean number of fibroblasts in the experimental group was significantlylower(40.6±10.2)compared to those in the control group(54.4±10.8)and blank group(68.2±11.6)(P【0.05,respectively).The mean numbers of the macrophage in the experimental and control groups were respcitively significantly lower versus the blank group(P【0.05,P【0.05,respectively).Compared to that in blank group,the level of transforming growth factor-β(TGF-β1)expression in sclera and conjunctival areas was reduced in the experimental and control groups on protein and mRNA level(P【0.05),but not significant difference between these two groups(P】0.05).CONCLUSION:The trabeculectory surgery with Honghua preserved AM can control IOP,sustain the functional filtration bleb,inhibit the proliferation of fibroblasts and open the filtrating pathway on the rabbit glaucoma models.
基金Supported by Key Research and Development Program of Shaanxi Province(No.2021SF-155)Natural Science Foundation of Jiangxi Province(No.20192BAB205049)+1 种基金National Innovation and Entrepreneurship Training Program for College Students(No.X202110698092)Clinical Research Grant from First Affiliated Hospital of Xi’an Jiaotong University(No.20ZD02)。
文摘·AIM:To compare the efficacy and safety of intravitreal aflibercept with dexamethasone implant in the treatment of macular edema(ME)associated with diabetic retinopathy(DR)or retinal vein occlusion(RVO).·METHODS:A comprehensive search of studies comparing dexamethasone and aflibercept in patients with ME was conducted at PubMed,Embase,and Cochrane Central Register of Controlled Trials from the beginning of library to April 16,2021.Extracting the data including bestcorrected visual acuity(BCVA),central retinal thickness(CRT),number of injections and serious adverse events(SAEs)from the final qualified articles.RevMan 5.3 software was used for Meta-analysis of the included studies.·RESULTS:Totally 7 studies with 369 eyes were included.The causes of ME in the final screening study included RVO and DR.Compared with the aflibercept treatment group,the BCVA of the dexamethasone implant treatment group showed no significant difference in the follow-up for 3 mo[mean difference(MD):-0.05,95%confidence interval(CI):-0.11,0.02;P=0.17]and 12 mo(MD:-0.01,95%CI:-0.38,0.37;P=0.98),but it was slightly worse than the aflibercept group at 6 mo(MD:0.12.95%CI:0.03,0.21;P=0.008).In terms of CRT reduction,there was no significant difference between the two groups at 3 mo(MD:-28.14,95%CI:-79.95,23.67;P=0.29),6 mo(MD:27.67,95%CI:-84.89,140.24;P=0.63),and 12 mo(MD:-59.00,95%CI:-127.37,9.37;P=0.09).However,dexamethasone implant had fewer injections,but more adverse events such as elevated intraocular pressure(IOP)and cataract.·CONCLUSION:Intravitreal injection of aflibercept and dexamethasone implant can both effectively increase BCVA and reduce CRT.Compared with aflibercept,dexamethasone implant is not inferior in improving vision and reducing CRT in the initial treatment period(3 mo)and long-term treatment period(12 mo).Besides,it has fewer injections and more likely to cause elevated IOP and cataract.
基金National Natural Science Foundation of China(No.81741058)Key Research and Development Program of Shaanxi Province(No.2021SF-155)First Affiliated Hospital of Xi’an Jiaotong University(No.2019QN-05).
文摘AIM:To quantitatively detect aqueous levels of angiopoietin-like(ANGPTL)3,ANGPTL4,and ANGPTL6 and investigate their correlation with optical coherence tomography angiography(OCTA)findings in patients with diabetic macular edema(DME).METHODS:This cross-sectional study included 23 patients(27 eyes)with type 2 diabetes and 16 control subjects(20 eyes).All patients underwent OCTA imaging and ultra-wide field fundus photography.Diabetic patients were categorized into two groups according to the presence or absence of diabetic retinopathy(DME group,14 patients,16 eyes);and non-diabetic retinopathy(NDR)group,9 patients,11 eyes,respectively.Aqueous levels of ANGPTL3,ANGPTL4,and ANGPTL6 were assessed using suspension array technology,and foveal-centered 3×3 mm2 OCTA scans were automatically graded to determine the central,inner,and full vessel density(CVD,IVD,FVD);central,inner,and full perfusion density(CPD,IPD,FPD),foveal avascular zone(FAZ)area,FAZ perimeter,and FAZ circularity index(FAZ-CI)on superficial capillary plexuses.Additionally,central subfield thickness(CST),cube volume(CV),and cube average thickness(CAT)were measured in a model of macular cube 512×128.RESULTS:Aqueous ANGPTL3 levels were not significantly different among the three groups(P>0.05).ANGPTL4 levels were significantly higher in the DME group than the control and NDR groups(P<0.0001 and P<0.001),while ANGPTL6 levels were significantly higher in the DME group than the control group(P<0.05).In the whole cohort,the aqueous ANGPTL3 levels correlated negatively with the IVD,FVD,IPD,and FPD,and positively with the CV and CAT.The aqueous ANGPTL4 levels correlated negatively with the CVD,IVD,FVD,CPD,IPD,and FPD,and positively with the FAZ perimeter,CST,CV,and CAT.The aqueous ANGPTL6 levels correlated negatively with the IVD,FVD,IPD,FPD,FAZCI and positively with CST,CV,CAT.CONCLUSION:ANGPTL4 and ANGPTL6 may be associated with vascular leakage in DME and may represent good targets for DME therapy.In addition,OCTA metrics may be useful for evaluating macular ischemia in DME.
基金Supported by National Natural Science Foundation of China(No.81470614,No.81460163,No.81300786)Fundamental Research Funds for the Central Universities(No.xjj2014146)+1 种基金Specialized Research Fund for the Doctoral Program of Higher Education(No.20133601120012)Key International Communication Project of Shaanxi province(No.2012KW-31)
文摘AIMTo investigate the expression of transcription factors Slug in human lens epithelial cells (HLECs) undergoing epithelial-mesenchymal transition (EMT) induced by connective tissue growth factor (CTGF).METHODSHLECs were treated with CTGF of different concentrations (20, 50 and 100 ng/mL) or without CTGF (control) for 24h. The morphological changes of HLECs were analysed by microscopy. The expression and cellular localization of Slug was evaluated by immumo-fluorescence. Expressions of Slug, E-cadherin and alpha smooth muscle actin (α-SMA) were further determined by Western blot analysis.RESULTSHLECs showed spidle fibrolasts-like characteristics and loosely connected each other after CTGF treatment. The immuno-fluorescence staining indicated that Slug was localized in the nuclei and its expression was induced by CTGF. The relative expressions of Slug protein were 1.64±0.11, 1.96 ±0.03, 3.12 ±0.10, and 4.08±0.14, respectively, in response to control group and treatment with CTGF of 20, 50 and 100 ng/mL (F=443.86, P<0.01). The increased Slug protein levels were correlated well with up-expression of α-SMA (0.78±0.05, 0.85±0.06, 2.17±0.15, 2.86±0.10; F=449.85, P<0.01) and down-expression of E-cadherin (2.50±0.11, 1.79±0.26, 1.05±0.14, 0.63±0.08; F=101.55, P<0.01).CONCLUSIONTranscription factor Slug may be involved in EMT of HLECs induced by CTGF in vitro.
基金Supported by National Natural Science Foundation of China(No.81960177,No.81741058,No.81400427,No.81460163,No.81300786)Grants from Jiangxi Science and Technology Department(No.20192BAB205049,No.20142BDH80005,No.20142BAB215029,No.20132BAB205024)Research Grants from Jiangxi Education Department(No.GJJ14094,No.GJJ13175)。
文摘AIM:To investigate whether inhibition of acetylcholinesterase(AChE)by donepezil ameliorate aberrant retinal neovascularization(RNV)and abnormal glial activation in oxygen-induced retinopathy(OIR).METHODS:A mouse model of RNV was induced in postnatal day 7(P7)mice by exposure to 75%oxygen.Donepezil was administrated to P12 mice by intraperitoneal injection.Expression and localization of AChE in mouse retinas were determined by immunofluorescence.RNV was evaluated by paraffin sectioning and hematoxylin and eosin(HE)staining.Activation of retinal M uller glial cells were examined by immunoblot of glial fibrillary acidic protein(GFAP).rMC-1.a retinal Muller cell line,was used for in vitro study.Expression of hypoxia-induced factor 1α(HIF-1α)and vascular endothelial growth factor(VEGF)were determined by Western-blot analysis,enzyme-linked immunosorbent assay(ELISA)or immunostaining.RESULTS:Aberrant RNV and glial activation was observed after OIR.Of note,retinal AChE was mainly expressed by retinal Muller glial cells and markedly increased in OIR mice.Systemic administration of donepezil significantly reduced RNV and abnormal glial activation in mice with OIR.Moreover,ischemia-induced HIF-1αaccumulation and VEGF upregulation in OIR mouse retinas and cultured rMC-1 were significantly inhibited by donepezil intervention.CONCLUSION:AchE is implicated in RNV with OIR.Inhibition of AChE by donepeizl is likely to be a potential therapeutic approach for retinal neovascular diseases.
基金This study was funded by the International Science and Technology Cooperation Program of the Science and Technology Department of Shaanxi Province,China(No.2021KW-16)the Science and Technology Project in Xi’an(No.2019218114GXRC017CG018-GXYD17.11),Thesis work was supported by the special fund construction project of Key Disciplines in Ordinary Colleges and Universities in Shaanxi Province,the authors would like to thank the anonymous reviewers for their helpful comments and suggestions.
文摘Text event mining,as an indispensable method of text mining processing,has attracted the extensive attention of researchers.A modeling method for knowledge graph of events based on mutual information among neighbor domains and sparse representation is proposed in this paper,i.e.UKGE-MS.Specifically,UKGE-MS can improve the existing text mining technology's ability of understanding and discovering high-dimensional unmarked information,and solves the problems of traditional unsupervised feature selection methods,which only focus on selecting features from a global perspective and ignoring the impact of local connection of samples.Firstly,considering the influence of local information of samples in feature correlation evaluation,a feature clustering algorithm based on average neighborhood mutual information is proposed,and the feature clusters with certain event correlation are obtained;Secondly,an unsupervised feature selection method based on the high-order correlation of multi-dimensional statistical data is designed by combining the dimension reduction advantage of local linear embedding algorithm and the feature selection ability of sparse representation,so as to enhance the generalization ability of the selected feature items.Finally,the events knowledge graph is constructed by means of sparse representation and l1 norm.Extensive experiments are carried out on five real datasets and synthetic datasets,and the UKGE-MS are compared with five corresponding algorithms.The experimental results show that UKGE-MS is better than the traditional method in event clustering and feature selection,and has some advantages over other methods in text event recognition and discovery.
文摘AIM:To investigate the effectiveness of a modified inferior oblique muscle belly transposition for treatment of V-pattern exotropia combined with mild to moderate inferior oblique muscle overaction.METHODS:Thirteen cases(23 affected eyes)of V-pattern exotropia with inferior oblique muscle overaction(+or++)who underwent the modified inferior oblique muscle belly transposition procedure were retrospectively reviewed.The amount of V-pattern,grade of inferior oblique overaction,degree of vertical strabismus,abnormal head posture,and the fovea-disc angle were evaluated before and after surgery.RESULTS:The V-pattern was corrected in all cases,and the amount of V-pattern reduced by 17.85±5.13 prism diopter(PD)on average(t=16.07,P<0.001).The surgical cure rate for mild to moderate inferior oblique muscle overaction was 87.0%(20/23).The degree of the foveadisc angle has a mean reduction of 5.45°±2.87°(t=3.95,P=0.003)after surgery.The mean vertical deviation in 5 cases with a small-angle hypertropia(5.23±3.06 PD)in the primary position reduced by 3.15±1.86 PD(t=6.10,P<0.001).No serious complications were observed.CONCLUSION:The modified inferior oblique muscle belly transposition procedure can effectively treat mild to moderate inferior oblique overaction and relieve the V-pattern,which is safe and easy to perform.
基金Supported by National Natural Science Foundation of China(No.82271098No.81960177)+1 种基金Key Research and Development Program of Shaanxi Province(2024SF-YBXM-322)Institutional Foundation of the First Affiliated Hospital of Xi’an Jiaotong University(No.2021ZXY-10).
文摘AIM:To compare the dif ferences of choroidal neovascularization(CNV)measurements between sweptsource and spectral-domain optical coherence tomography angiography(SS-OCTA and SD-OCTA)in neovascular agerelated macular degeneration(nAMD)and the imaging reliability of the two devices.METHODS:Prospective comparative study.SS-OCTA and SD-OCTA were used to scan the same eye with the modes of 3×3 and 6×6 mm2 centered on the neovascularization.Only qualified images were chosen and the border of CNV was manually delineated by two graders independently.The area of CNV(ACNV),vascular perfusion density(PD),and vessel length density(VLD)within the delineation were calculated using Image J.The differences of CNV measurements between the two OCTA devices were compared using Bland-Altman analysis.The agreement between the two graders on the measurements of each device was compared using the intraclass correlation coefficient(ICC).RESULTS:A total of 18 patients(22 eyes)with nAMD were included.The measurements of ACNV,PD,and VLD were 7.247±4.586 and 4.901±3.741 mm^(2),43.202±9.636 and 34.904±10.489,6.339±1.228 and 5.908±1.741 mm^(-1) for SS-OCTA and SD-OCTA,respectively.The differences between the two devices were 2.346±3.030 mm^(2)(Z=-3.782,P<0.0001),8.298±14.160(Z=-2.419,P=0.016),and 0.431±2.114 mm^(-1)(Z=-0.828,P=0.408)for ACNV,PD and VLD,respectively.The ICC between two graders were 0.893(P<0.001),0.902(P<0.001),0.885(P<0.001)for ACNV,PD,VLD in SS-OCTA,and 0.971(P<0.001),0.976(P<0.001),0.973(P<0.001)in SD-OCTA,respectively.CONCLUSION:Both OCTA devices have high imaging reliability.Compared with SD-OCTA,SS-OCTA has a larger ACNV measurements,but doesn’t show better resolution of internal vessels of CNV and well signal strength.
文摘目的:评价改良折叠式人工晶状体(IOL)悬吊治疗外伤性晶状体脱位的手术技术。方法:前瞻性随机对照研究。共15例患者接受了改良折叠式IOL悬吊手术。其中,9例患者选择了Akreos AO IOL,使用聚丙烯缝线穿过IOL的环状襻,经巩膜引导穿刺后,缝合线末端热膨胀固定在巩膜。6例患者选择了Tecnis ZA9003 IOL,未使用缝合线,巩膜穿刺引导IOL襻穿出巩膜后,直接将IOL襻末端热膨胀固定在巩膜内。观察所有患者的最佳矫正视力(BCVA,LogMAR)及术后并发症。结果:研究共纳入15例患者,其中男7例,女8例,平均年龄64.00±9.85岁,平均病程5.80±3.17wk。人口统计学和基线临床特征之间没有显著差异。接受改良折叠式IOL悬吊手术后,所有患者视力均有明显改善。术后3mo,患者的BCVA(LogMAR)从1.28±0.56改善至0.52±0.30。其中,选择Akreos AO IOL患者的BCVA(LogMAR)从1.39±0.62改善至0.59±0.25,选择Tecnis ZA9003 IOL患者的BCVA(LogMAR)从1.12±0.45改善至0.42±0.35。此外,在我们的研究中没有观察到严重的术后并发症。仅1例患者IOL脱位,IOL光学面轻度倾斜。结论:改良折叠式IOL悬吊手术具有良好的视觉效果和预后,无严重并发症,是IOL悬吊手术的有效选择。
基金Supported by National Natural Science Foundation of China(No.81741058No.81460163+10 种基金No.81400427No.81300786)Fundamental Research Funds for the Central Universities(No.xjj2015015)Research Grants from Shaanxi Provincial Department of Science and Technology(No.2016KJXX-12No.2016JM8029)Specialized Research Fund for the Doctoral Program of Higher Education(No.20133601120012)Research Grants from Jiangxi Provincial Department of Science and Technology(No.20142BAB215029No.20132BAB205024No.20142BDH80005)Research Grants from Education Department of Jiangxi Province(No.GJJ14094No.GJJ13175)
文摘AIM： To compare a trifocal intraocular lens （IOL） and a bifocal IOL implantation in improving visual function after cataract surgery. METHODS： Eligible literatures were systematically searched through EMBASE and PubMed databases. The inclusion criteria were prospective comparative clinical trials on cataract surgery comparing trifocal IOL with bifocal IOL implantation that assessed visual acuity, contrast sensitivity and subjective vision quality. The effects were computed as standardized mean differences and pooled using fixed-effect or random-effect models. RESULTS： Four prospective randomized controlled trials （RCTs） and five cohorts provided data were included by a systematic review, comprising 265 eyes implanted with trifocal IOLs and 264 eyes implanted with bifocal IOLs. Monocular distance visual acuity （VA） showed a statistically significant but small difference that favored trifocal IOLs （MD=.0.06; 95%CI, -0.10 to -0.02; Z=2.90, P=0.004 for uncorrected distance VA, and MD- -0.02; 95%CI, -0.03 to .0.00; Z=2.02, P=0.04 for corrected distance VA）, but the data did not suggest that the effect of trifocal IOL implantation would clinically outperform bifocal IOL implantation. There was no significant difference in monocular near VA （MD=.0.01; 95%CI, -0.07 to 0.04; Z=0.42, P=-0.68 for distance-corrected near VA, and MD=-0.01; 95%CI, -0.06 to 0.03; Z=0.55, P=0.58 for corrected near VA） or refraction between two groups. Contrast sensitivity and subjective visual quality had no conclusive results. CONCLUSION： All results indicate that trifocal IOL and bifocal IOL had similar levels of monocular distance and near VA.
基金Supported by Young Talent Research Scholar Grant(No.2016KJXX-12)Shaanxi Natural Science Grant(No.2016JM8029)
文摘AIM：To investigate whether curcumin suppressed corneal neovascularization（CNV） formation via inhibiting activation of Wnt/β-catenin pathway.METHODS：Suture-induced CNV was established on Sprague-Dawley（SD） rats.Curcumin were daily administrated by subconjunctival injection.Phosphorylation of low-density lipoprotein receptor-related protein 6（LRP6） and nuclear accumulation of β-catenin,two indicators of activated Wnt/β-catenin pathway,were determined by Western-blot analysis in subconfl uent/proliferating human microvascular endothelial cells（HMEC） and neovascularized corneas.Wnt3 a conditioned medium（WCM） were harvested from Wnt3 a expressing cells.WCM-induced cell proliferation and endothelial tubular formation capacity was measured by MTT assay and Matrigel assay,respectively.RESULTS：Phosphorylation of LRP6 and nuclear accumulation of β-catenin was significantly increased in subconfluent/proliferating endothelial cells.Activation of Wnt/β-catenin pathway by WCM markedly promotes HMEC proliferation and tubular formation.Curcumin inhibited LRP6 phosphorylation and nuclear accumulation of β-catenin.In addition,curcumin attenuated WCM-induced HMEC proliferation and disrupted tubular structure of endothelial cells on Matrigel.Meanwhile curcumin suppressed suture-induced CNV and inhibited LRP6 phosphorylation as well as β-catenin accumulation in SD rats.CONCLUSION：Taken together,activation of Wnt/β-catenin pathway could be involved in endothelial proliferation during suture-induced CNV formation and curcumin attenuated CNV formation via inhibition of Wnt/β-catenin pathway activation.
基金Supported by Natural Science Foundation Grant from Jiangxi Science and Technology Department (No.20192BAB205049)Young Talent Scholar Grant (No.2016KJXX-12)from Shaanxi Science and Technology Department, Teaching Reform Grant (No.JC2020-0309,No.JG20190330)。
文摘AIM: To analyze whether wet-lab training(WLT) or surgical-simulator training(SST) is better for ophthalmology residents to master the chopping technique.METHODS: Sixty ophthalmology residents(in their second year) and three cataract surgeons participated in the study. The residents were randomly separated into two groups, WLT group and SST group. The residents in WLT group were asked to perform 10 trials of chopping using pig eyes and scored by the surgeons, and then they performed and scored using simulator for one time. The residents in SST group underwent 10 trials of chopping using simulator, and the simulator scored each trail. Then, this group were asked to perform the chopping using pig eyes and scored by the surgeons. At last, we investigated the residents’ satisfaction about the training.RESULTS: The demographic characteristics had no significant differences between the two groups. Recorded by the simulator, the residents in SST group got significantly higher overall score(83.90±1.31) than WLT group(78.73±1.92, P=0.03). And the residents in SST group got less corner area injured, and they spend less time than WLT group(P<0.05). Moreover, the residents in WLT group used more ultrasonic energy value than SST group(P=0.03). However, scored by the surgeons, the residents in two groups got nearly the same overall score. The residents in WLT group performed better on the frequencies of posterior capsule torn and incisional stress(P=0.03, 0.008, respectively). In the survey, the residents in two groups held the same opinion that the training was helpful and they strongly recommended this training. And all of them enjoyed the training, and enjoyed being randomized in their own group. However, with respect to the realistic character, the residents thought that WLT was better than SST(P<0.001).CONCLUSION: Both of the Eyesi surgical-stimulator and the wet-lab improve the residents’ chopping ability and each has its own advantages. The combination of the two training ways could be considered to be a part of the training curriculum for new residents.
基金was supported by the National Natural Science Foundation of China under Grant No. U1330202 and 11204279the Foundation of Terahertz Research Center, CAEP under Grant No. T2014-005-0103
文摘The absorption spectrum of the cyclotrime-thylenetrinitramine （RDX） with four different particle sizes are measured in the frequency range from 0.1THz to 2.5THz by using the terahertz time-domain spectroscopy （THz-TDS）, and the characteristic absorption peaks are acquired. All the samples are measured in a loose condition, which is very close to the real using environment of the RDX. The results show that the four kinds of samples have similar absorption peaks around the frequency of 0.82THz, 1.05 THz, 1.30THz, 1.46THz, 1.65THz, and 1.95THz. The sample with a large particle size obtains more peaks than the small one, while the peaks obtained from the sample with a small size are more protrudent. The reasons for these differences can be the refraction, scattering, and attenuation of the terahertz wave when it passes through the crystal samples. The theoretical terahertz spectrum of RDX was simulated by using density functional calculations, in which, the Becke ＆amp; Perdew-Wang＇s functional is used in a double numerical plus polarization method （BP/DNP）. Good agreements between the experimental and computed results show that the three peaks located in the frequency of 1.30THz, 1.48THz, and 1.96THz are caused respectively by the twisting of three-nitrogen heterocyclic, the symmetrical oscillations of the double nitro groups, and the oscillations of a single nitro group.
