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Challenges in Diagnosing and Managing Dieulafoy’s Lesions: A Case Report Highlighting the Importance of Clinical Suspicion and Multidisciplinary Approach in Obscure Gastrointestinal Bleeding
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作者 Feruza Abraamyan Neeladri Misra +3 位作者 Kenneth Tran Khalid Mahmood Benjamin Coombs Shilpa Lingala 《Open Journal of Gastroenterology》 CAS 2024年第3期80-86,共7页
Upper gastrointestinal bleeding remains a significant cause of hospital admissions. Even though the incidence of peptic ulcer disease and gastritis is decreasing, the incidence rates in neoplasm, Dieulafoy’s lesions,... Upper gastrointestinal bleeding remains a significant cause of hospital admissions. Even though the incidence of peptic ulcer disease and gastritis is decreasing, the incidence rates in neoplasm, Dieulafoy’s lesions, angiodysplasia, and esophagitis are trending up, which necessities physicians to be aware of those pathologies and their specifics. Here, we represent a case of a 62-year-old male on dual antiplatelet therapy who was transferred to our hospital due to severe melena with suspicion of upper gastrointestinal bleeding. Due to hemodynamic instability, the patient was intubated and started on vasopressors. However, several repeated EGDs and CTs of the abdomen with GI bleeding protocol did not reveal the location of active bleeding to stop it. At the same time, clinically, the patient was hemodynamically unstable with continued melena. On the last EGD, a small area of concern resembling gastric varix was clipped for identification purposes, and the patient underwent a selective angiogram with further diagnosis of Dieulafoy’s lesion, which was successfully embolized. Our case demonstrates that Dieulafoy’s lesions can present as severe life-threatening hemorrhage, hard to diagnose with traditional methods such as EGD or CTs, in which case it is recommended to proceed with an angiogram sooner rather than later for further diagnosis and treatment if needed. 展开更多
关键词 Upper Gastrointestinal Bleeding dieulafoy’s Lesion ANGIODYsPLAsIA MELENA HEMATOCHEZIA EGD ANGIOGRAM EMBOLIZATION
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Dieulafoy’s病5例临床及病理观察 被引量:5
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作者 时淑舫 张长淮 黄受方 《临床和实验医学杂志》 2003年第4期234-235,T001,共3页
Dieulafoy's病又称胃黏膜异常恒径动脉畸形破裂出血,首次报道至今已有112年.随着对本病的认识的不断深入,发病率也不断增高.
关键词 dieulafoy’s 病理组织学 临床表现 发病机制
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Dieulafoy’s病的诊治 被引量:4
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作者 赵晓红 赵永庆 《中外医疗》 2010年第35期61-62,共2页
目的总结Dieulafoy’s病的诊断及治疗。方法复习近年有关Dieulafoy’s病的文献,综述成文。结果 Dieulafoy’s病临床少见,近年来发病率增加,由于急诊胃镜检查的开展,对本病的认识已大大提高。结论 Dieulafoy’s病又称粘膜恒径动脉畸形破... 目的总结Dieulafoy’s病的诊断及治疗。方法复习近年有关Dieulafoy’s病的文献,综述成文。结果 Dieulafoy’s病临床少见,近年来发病率增加,由于急诊胃镜检查的开展,对本病的认识已大大提高。结论 Dieulafoy’s病又称粘膜恒径动脉畸形破裂出血,以突然发生、反复发作性大量呕血,常伴有休克而又无相关病史为特点。该病死亡率高。胃镜为首选和主要的诊断方法,治疗方法有内镜治疗、血管栓塞及手术。 展开更多
关键词 dieulafoy’s 诊断 治疗
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Clinical and endoscopic analysis of gastric Dieulafoy’s lesion 被引量:11
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作者 Yi-Juan Ding,Liang Zhao,Jun Liu,He-Sheng Luo,Department of Gastroenterology,Renmin Hospital of Wuhan University, Jiefang Road 238,Wuhan 430060,Hubei Province,China 《World Journal of Gastroenterology》 SCIE CAS CSCD 2010年第5期631-635,共5页
AIM:To investigate the incidence,location,clinical presentation,diagnosis and effectiveness of endoscopic treatment of gastric Dieulafoy's lesion(DL)in China. METHODS:All patients who received emergency upper gast... AIM:To investigate the incidence,location,clinical presentation,diagnosis and effectiveness of endoscopic treatment of gastric Dieulafoy's lesion(DL)in China. METHODS:All patients who received emergency upper gastrointestinal(GI)endoscopy due to gastric DL from February 2000 to August 2008 at GI endoscopy center of Renmin Hospital of Wuhan University were included in this study.The clinical presentation,medical history,location and characteristics of DL methods and effectiveness of therapy of patients with DL were retrospectively analysed by chart reviews.Long-term follow-up data were collected at outpatient clinics or telephone interviews. RESULTS:Fifteen patients were diagnosized with DL,which account for 1.04%of the source of bleed- ing in acute non-variceal upper GI bleeding.Common comorbidities were found in one patient with hypertension and diabetic mellitus.Hemoclip or combined therapy with hemoclip produced primary hemostasis in 92.8%(13/14) of patients. CONCLUSION:DL is uncommon but life-threatening in China.Hemoclip proved to be safe and effective in controlling bleeding from DL. 展开更多
关键词 Gastric dieulafoy’s lesion Clinical analysis Endoscopic analysis
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Recurrent hemoptysis in pediatric bronchial Dieulafoy’s disease with inferior phrenic artery supply:A case report 被引量:1
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作者 Fang Wang Jiao Tang +4 位作者 Mou Peng Pu-Jue Huang Li-Juan Zhao Yin-Yue Zhang Tao Wang 《World Journal of Clinical Cases》 SCIE 2023年第26期6268-6273,共6页
BACKGROUND Bronchial Dieulafoy’s disease(BDD)is characterized by the erosion of an anomalous artery in the submucosa of the bronchus.The etiology of pediatric BDD is mainly congenital dysplasia of bronchus and pulmon... BACKGROUND Bronchial Dieulafoy’s disease(BDD)is characterized by the erosion of an anomalous artery in the submucosa of the bronchus.The etiology of pediatric BDD is mainly congenital dysplasia of bronchus and pulmonary arteries,which is different from chronic inflammatory injury of the airway in adult patients.The internal thoracic artery,subclavian artery,and intercostal artery are known to be involved in the blood supply to the BDD lesion in children.CASE SUMMARY We report a case of BDD in a 4-year-old boy with recurrent hemoptysis for one year.Selective angiography showed a dilated right bronchial artery,and anastomosis of its branches with the right lower pulmonary vascular network.Bronchoscopy showed nodular protrusion of the bronchial mucosa with a local scar.Selective embolization of the bronchial artery was performed to stop bleeding.One month after the first intervention,the symptoms of hemoptysis recurred.A computed tomography angiogram(CTA)showed another tortuous and dilated feeding artery in the right lower lung,which was an abnormal ascending branch of the inferior phrenic artery(IPA).The results of angiography were consistent with the CTA findings.The IPA was found to be another main supplying artery,which was not considered during the first intervention.Finally,the IPA was also treated by microsphere embolization combined with coil interventional closure.During the one-year follow-up,the patient never experienced hemoptysis.CONCLUSION The supplying arteries of the bleeding lesion in children with BDD may originate from multiple different aortopulmonary collateral arteries,and the IPA should be considered to reduce missed diagnosis.CTA is a noninvasive radiological examination for the screening of suspected vessels,which shows a high coincidence with angiography,and can serve as the first choice for the diagnosis of BDD. 展开更多
关键词 HEMOPTYsIs CHILD Bronchial dieulafoy’s disease Inferior phrenic artery Interventional treatment Case report
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An Infant with Dieulafoy’s Lesion: A Case Report from the Philippines
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作者 Jireh Grace Sabrido Manungas Perlina Umusig-Quitain Genelynne Juruena-Beley 《Open Journal of Gastroenterology》 2023年第12期420-428,共9页
This is a case of a 5-month-old infant who experienced repeated episodes of hematemesis and no known underlying health conditions. It was subsequently diagnosed as Dieulafoy’s lesion localized in the lesser curvature... This is a case of a 5-month-old infant who experienced repeated episodes of hematemesis and no known underlying health conditions. It was subsequently diagnosed as Dieulafoy’s lesion localized in the lesser curvature of the stomach. Endoscopic diagnosis and treatment were done by angiographic embolization. Dieulafoy’s lesion is considered rare even for adult cases, much more for pediatric patients and usually underdiagnosed. Hence, patients presenting with gastrointestinal bleeding should be managed in a multidisciplinary approach. Spreading awareness about this lesion by including it in the considerations, may help improve early detection and treatment. 展开更多
关键词 dieulafoy’s Lesion Gastrointestinal Bleeding Upper Gastrointestinal Bleeding HEMATEMEsIs BLEEDING
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Dieulafoy’s Lesion of the Duodenum: The Management of This Unusual Location
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作者 Rajae Bounour Amal Mejait +9 位作者 Maria Lahlali Asmae Lamine Hakima Abid Hakima Abid Amine Mekkaoui Mounia Elyousfi Dafrallah Benajeh Mohamed El Abkari Sidi Adil Ibrahimi Nada Lahmidani 《Case Reports in Clinical Medicine》 2022年第7期268-272,共5页
Dieulafoy lesion (DL) is a rare source of gastrointestinal tract bleeding that can affect any site of the gastrointestinal tract, particularly the stomach and less commonly the duodenum. Early endoscopy during a bleed... Dieulafoy lesion (DL) is a rare source of gastrointestinal tract bleeding that can affect any site of the gastrointestinal tract, particularly the stomach and less commonly the duodenum. Early endoscopy during a bleeding episode is essential for an accurate diagnosis and sometimes multiple endoscopies are needed to establish the diagnosis. In this report, we describe a case of duodenal DL detected and treated by endoscopy. We report the case of a 65-year-old patient admitted for massive upper gastrointestinal bleeding due to a Dieulafoy lesion of the duodenum. Endoscopic diagnosis and treatment were possible and hemostasis was achieved by injecting adrenaline and placing 3 clips. Various effective endoscopic techniques are available to control bleeding, the combination of injection therapy and mechanical therapy reduces the risk of recurrence. 展开更多
关键词 dieulafoy’s Lesion ENDOsCOPY Hemostatic Clips
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奥曲肽治疗Dieulafoy’s lesion 12例报告 被引量:3
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作者 柯元良 张葵玲 《海峡药学》 1999年第2期96-97,共2页
关键词 奥曲肽 杜氏损害 dieulafoy 治疗 疗效
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Efficacy of endoscopic therapy for gastrointestinal bleeding from Dieulafoy’s lesion 被引量:4
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作者 Jun Cui Liu-Ye Huang Yun-Xiang Liu Bo Song Long-Zhi Yi Ning Xu Bo Zhang Cheng-Rong Wu 《World Journal of Gastroenterology》 SCIE CAS CSCD 2011年第10期1368-1372,共5页
AIM: To investigate the endoscopic hemostasis for gastrointestinal bleeding due to Dieulafoy's lesion. METHODS: One hundred and seven patients with gastrointestinal bleeding due to Dieulafoy's lesion were treated ... AIM: To investigate the endoscopic hemostasis for gastrointestinal bleeding due to Dieulafoy's lesion. METHODS: One hundred and seven patients with gastrointestinal bleeding due to Dieulafoy's lesion were treated with three endoscopic hemostasis methods: aethoxysklerol injection (46 cases), endoscopic hemoclip hemostasis (31 cases), and a combination of hemoclip hemostasis with aethoxysklerol injection (30 cases). RESULTS: The rates of successful hemostasis using the three methods were 71.7% (33/46), 77.4% (24/31) and 96.7% (29/30), respectively, with significant differences between the methods (P 〈 0.05). Among those who had unsuccessful treatment with aethoxysklerol injection, 13 were treated with hemoclip hemostasis and 4 underwent surgical operation; 9 cases were successful in the injection therapy. Among the cases with unsuccessful treatment with hemoclip hemostasis,7 were treated with injection of aethoxysklerol and 3 cases underwent surgical operation; 4 cases were successful in the treatment with hemoclip hemostasis. Only 1 case had unsuccessful treatment with a combined therapy of hemoclip hemostasis and aeth- oxysklerol injection, and surgery was then performed. No serious complications of perforation occurred in the patients whose bleeding was treated with the endoscopic hemostasis, and no releeding was found during a 1-year follow-up. CONCLUSION: The combined therapy of hemoclip hemostasis with aethoxysklerol injection is the most effective method for gastrointestinal bleeding due to Dieulafoy's lesion. 展开更多
关键词 dieulafoys lesion Gastrointestinal bleeding Endoscopic therapy AETHOXYsKLEROL Therapeutic efficacy
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Endoscopic management of massive rectal bleeding from a Dieulafoy’s lesion:Case report 被引量:2
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作者 Mario Rene Pineda-De Paz Massiel Madelin Rosario-Morel +2 位作者 Jose Guadalupe Lopez-Fuentes Luis Ariel Waller-Gonzalez Rodrigo Soto-Solis 《World Journal of Gastrointestinal Endoscopy》 CAS 2019年第7期438-442,共5页
BACKGROUND Rectal Dieulafoy's lesions (DLs) are very rare;however, they can be life threatening when presented with massive hemorrhage. CASE SUMMARY A 44-year-old female with medical history of chronic renal failu... BACKGROUND Rectal Dieulafoy's lesions (DLs) are very rare;however, they can be life threatening when presented with massive hemorrhage. CASE SUMMARY A 44-year-old female with medical history of chronic renal failure who was on renal replacement therapy presented with lower gastrointestinal hemorrhage. Physical examination revealed signs of hypovolemic shock and massive rectal bleeding. Complete blood count revealed abrupt decrease in hematocrit. After hemodynamic stabilization, an urgent colonoscopy was performed. A rectal DL was diagnosed, and it was successfully treated with two hemoclips. There were no signs of recurrent bleeding at thirty days of follow-up. CONCLUSION Rectal DLs represent an unusual cause of lower gastrointestinal bleeding. Massive hemorrhage can increase the morbidity and mortality of these patients. Endoscopic management continues to be the reference standard in the diagnosis and therapy of these lesions. Thermal, mechanical (hemoclip or band ligation), or combination therapy (adrenaline injection combined with thermal or mechanical therapy) should be considered the first choice for treatment. 展开更多
关键词 dieulafoy's LEsION Endoscopic HEMOsTAsIs MAssIVE RECTAL BLEEDING Case report
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Uremic Bleeding in 2 Patients with Dieulafoy’s Lesion: Case Report and Literature Review
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作者 Gustavo Adolfo Hernández Valdez Diana Estefanía Ibarra García +7 位作者 Juan Antonio Contreras Escamilla Janette Alejandra Gamiño Gutierrez Francisco Manuel Tonatiuh Carrillo Beltran Ulises Solis Gomez Jocelyn Nataly Quintero Meléndez Ivan Alejandro Medina Jimenez Marco Antonio González Villar Jorge Rojas Morales 《Open Journal of Gastroenterology》 CAS 2024年第5期167-173,共7页
Dieulafoy’s lesions are rare vascular malformations of the gastrointestinal tract. A Dieulafoy’s lesion is an aberrant vessel that does not reduce in caliber when it extends from the submucosa to the mucosa. Damage ... Dieulafoy’s lesions are rare vascular malformations of the gastrointestinal tract. A Dieulafoy’s lesion is an aberrant vessel that does not reduce in caliber when it extends from the submucosa to the mucosa. Damage to this artery can cause severe and intermittent arterial bleeding from small vascular stumps that are difficult to visualize. Furthermore, these catastrophic bleeding episodes frequently result in hemodynamic instability and the need for transfusion of multiple blood products. Recently, uremic syndrome has been identified as a risk factor for gastric mucosal lesions. We present two clinical cases of acute digestive bleeding due to Dielafoy lesion with chronic kidney disease as the main cause, where two different therapies were performed endoscopically. We concluded with the results of our patients that the best therapy was the application of the hemostatic hemoclip on the injury vs the injection with adrenaline on the wound site. Uremia is identified as a risk factor for upper gastrointestinal bleeding in patients with pre-existing Dieulafoy’s lesion, as well as a higher incidence of new bleeding. 展开更多
关键词 dieulafoy’s Lesion Gastrointestinal Bleeding ENDOsCOPY ENDOsCOPY Hemostatic Clips Kidney Disease ADRENALINE Thermal Coagulation dieulafoy
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东昆仑造山带岩浆Ni-Co硫化物矿床成矿作用:橄榄石成分和全岩S同位素制约 被引量:1
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作者 陈文 陈列锰 +3 位作者 于宋月 李大鹏 吴树宽 王治安 《岩石学报》 北大核心 2025年第2期453-475,共23页
东昆仑造山带不仅产出世界级夏日哈木Ni-Co硫化物矿床,也产出多个同时代的含岩浆硫化物的镁铁-超镁铁质岩体,如石头坑德。夏日哈木和石头坑德岩体具有相似的矿物学和岩石学特征,但二者的成矿规模明显不同,这些异同点为探讨造山带环境幔... 东昆仑造山带不仅产出世界级夏日哈木Ni-Co硫化物矿床,也产出多个同时代的含岩浆硫化物的镁铁-超镁铁质岩体,如石头坑德。夏日哈木和石头坑德岩体具有相似的矿物学和岩石学特征,但二者的成矿规模明显不同,这些异同点为探讨造山带环境幔源岩浆的硫饱和机制与过程、以及岩浆硫化物成矿控制因素提供了良好的对象。本文在前人研究的基础上,系统分析与对比夏日哈木和石头坑德岩体的橄榄石成分和全岩S同位素组成,探讨造山带环境岩浆硫化物矿床的成矿作用。夏日哈木岩体中橄榄石的Fo牌号在82.3~90.0之间,Ni含量在558×10^(-6)~4370×10^(-6)之间;石头坑德岩体中橄榄石的Fo牌号在79.9~90.2之间,Ni含量在300×10^(-6)~3040×10^(-6)之间。夏日哈木岩体全岩的δ^(34) S值在4.0‰~6.4‰之间,平均值为5.2‰;石头坑德岩体全岩的δ^(34) S值在1.8‰~4.6‰之间,平均值为3.2‰。夏日哈木岩体中高Fo牌号橄榄石的Ni含量(高达4000×10^(-6))明显高于石头坑德岩体(通常小于3000×10^(-6)),表明前者母岩浆的Ni含量高于后者。石头坑德岩体贫硫化物纯橄岩中橄榄石具有高的Fo牌号和低的Ni含量,且显示出负相关性。这些特征表明石头坑德岩体母岩浆演化过程经历了富Mg碳酸盐岩的混染:富Mg物质的加入不仅促使结晶出高Fo牌号的橄榄石,也延长了橄榄石的结晶区间。由于Ni在橄榄石中为中等相容元素,大量橄榄石的结晶导致残余岩浆中的Ni含量进一步降低。此外,岩相学研究表明夏日哈木岩体中包裹硫化物珠滴的橄榄石Fo牌号较高,最高值达89.2;相反,石头坑德岩体中包裹硫化物珠滴的橄榄石的Fo牌号通常低于85。这些特征指示母岩浆演化过程中夏日哈木岩体的S饱和与硫化物熔离阶段早于石头坑德。另一方面,夏日哈木和石头坑德岩体的全岩δ^(34) S值均明显高于地幔(-2‰~+2‰),暗示二者母岩浆演化过程中有地壳S的加入。由于两个岩体直接围岩中的S含量都很低,因此,深部地壳S的加入是促使两个岩体母岩浆达到硫饱和、发生硫化物熔离的关键因素。综合以上认识,我们提出岩浆演化过程中早期大量橄榄石的结晶和较晚阶段S饱和是导致石头坑德岩体相对(夏日哈木岩体)贫Ni的重要机制。因此,原始岩浆富Ni、深部地壳S的加入导致岩浆演化早期硫化物熔离等条件与过程的耦合是东昆仑造山带超大型岩浆硫化物矿床成矿的关键控制因素。 展开更多
关键词 东昆仑造山带 镁铁-超镁铁质岩体 岩浆硫化物矿床 橄榄石 s同位素
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2021年老挝M_(S)6.0地震序列研究
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作者 孙楠 贺素歌 +1 位作者 刘自凤 李利波 《地震研究》 北大核心 2025年第1期1-9,共9页
云南地震活动与周边强震存在“构造相连,动力同源”的特征,研究周边强震的序列演化特征及发震构造,对云南地区地震研究具有重要意义。2021年12月24日老挝M_(S)6.0地震发生在滇西南地区的NW向整董断裂附近,震源机制解显示,此次地震是一... 云南地震活动与周边强震存在“构造相连,动力同源”的特征,研究周边强震的序列演化特征及发震构造,对云南地区地震研究具有重要意义。2021年12月24日老挝M_(S)6.0地震发生在滇西南地区的NW向整董断裂附近,震源机制解显示,此次地震是一次走滑型破裂事件,破裂方向与区域构造特征一致。老挝M_(S)6.0地震序列属于前震-主震-余震型序列,主震前震中附近出现3~4级地震非常活跃的现象,前震序列参数计算显示b值波动相对幅度较大,h值出现“上翘”形态,而余震序列b值和h值变化均相对平稳,主震的同震库伦应力结果表明老挝地震可能对云南地区有应力加载作用。 展开更多
关键词 老挝M_(s)6.0地震 前震序列 余震序列 序列参数
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采用Liutex涡识别法的水泵水轮机S区内流特性分析
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作者 肖业祥 肖微 +2 位作者 任绍成 陈柳 刘子实 《水力发电学报》 北大核心 2025年第1期135-142,共8页
为探究水泵水轮机S特性出现的原因,首先将数值预测的特性曲线与模型试验进行了对比分析,然后基于Liutex涡识别法分析了各过流部件在S特性区的流动和涡旋分布情况,探讨了S区相同转速不同流量工况下的内部流动变化规律。分析发现:相同转... 为探究水泵水轮机S特性出现的原因,首先将数值预测的特性曲线与模型试验进行了对比分析,然后基于Liutex涡识别法分析了各过流部件在S特性区的流动和涡旋分布情况,探讨了S区相同转速不同流量工况下的内部流动变化规律。分析发现:相同转速下水轮机工况蜗壳内的流动稳定性较好,几乎没有涡旋出现;导叶和转轮域内流动较为均匀,只在无叶区分布有少量涡旋,水流稳定性较好。制动工况蜗壳内流动开始变得较不稳定,涡旋集中分布在蜗壳出口环面上,容易形成涡团阻碍水流进入固定导叶;在导叶叶栅间存在明显的涡旋和回流现象,导叶和转轮的叶栅堵塞较为严重。反水泵工况在尾水管出口出现螺旋状回流,导致流入转轮的水流发生旋转失速等不稳定现象;水流一部分在活动导叶进水边沿圆周方向高速流动,存在严重的流动分离现象,涡旋分布最密集,由于无叶区内存在压力突变区,导致涡旋几乎占据整个流道。 展开更多
关键词 可逆式水泵水轮机 Liutex涡识别法 s特性区 涡旋特征
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2023年8月6日山东平原M_(S)5.5地震震源参数分析
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作者 李翠芹 郑建常 +1 位作者 张正帅 戴宗辉 《地震研究》 北大核心 2025年第2期334-340,共7页
基于Brune模型,使用高频截止方法估计模型参数,得到2023年8月6日山东省德州市平原M_(S)5.5主震及部分M_(L)≥2.0余震的震源谱的特征参数,对不同震源参数之间的定标关系以及视应力的时空特征进行了分析讨论,结果显示:(1)主震视应力约为1.... 基于Brune模型,使用高频截止方法估计模型参数,得到2023年8月6日山东省德州市平原M_(S)5.5主震及部分M_(L)≥2.0余震的震源谱的特征参数,对不同震源参数之间的定标关系以及视应力的时空特征进行了分析讨论,结果显示:(1)主震视应力约为1.71 MPa,应力降约为3.51 MPa,矩震级为5.2,拐角频率约为0.58 Hz;(2)平原地震序列视应力与震级存在线性关系,可表示为:lg δ_(app)=0.64M_(L)+2.92;(3)余震视应力随时间发展逐渐减小,38次余震的视应力均小于0.15 MPa,低于鲁西地区小震平均视应力(0.16 MPa)。 展开更多
关键词 平原M_(s)5.5地震 视应力 震源参数 拐角频率 鲁西地区
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基于背景噪声反演的兴蒙造山带阿巴嘎地区地壳S波速度结构
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作者 徐荟 吴庆举 《地震学报》 北大核心 2025年第1期54-72,共19页
利用布设于兴蒙造山带内蒙古中部阿巴嘎台阵记录的连续背景噪声数据,获取了研究区内周期为5—30 s的瑞雷面波频散,使用马尔科夫链-蒙特卡洛反演方法建立了阿巴嘎地区地壳高分辨率三维S波速度结构。结果显示,阿巴嘎和达里诺尔火山区上中... 利用布设于兴蒙造山带内蒙古中部阿巴嘎台阵记录的连续背景噪声数据,获取了研究区内周期为5—30 s的瑞雷面波频散,使用马尔科夫链-蒙特卡洛反演方法建立了阿巴嘎地区地壳高分辨率三维S波速度结构。结果显示,阿巴嘎和达里诺尔火山区上中下地壳的S波速度均呈低速,且下地壳30 km处存在明显的低速区,推断该处可能为下地壳的岩浆囊及上方岩浆通道。此外,阿巴嘎、达里诺尔、达里甘嘎和乌兰哈达火山群在地壳内的低速区都是相互连通的。结合前人研究结果,推测出阿巴嘎和达里诺尔火山群的岩浆源区位于上地幔顶部,并且进一步推测阿巴嘎和达里诺尔火山群的形成是源于区域内地幔热物质上涌,沿缝合带或断层侵入到地壳诱发了地表火山活动。 展开更多
关键词 兴蒙造山带阿巴嘎 阿巴嘎火山群 达里诺尔火山群 背景噪声 s波速度
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基于PC SDK的智能装配工作站远程监控系统研究与设计
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作者 梁盈富 赵豆 祝战科 《机械制造与自动化》 2025年第1期131-134,共4页
以智能装配工作站为研究对象,运用机器人控制器的PC SDK接口对工作站系统进行二次开发,研究了智能装配工作站的网络架构,并在C/S架构下设计工业机器人智能装配工作站远程监控方案,开发了智能装配工作站远程监控系统。实验结果表明:该系... 以智能装配工作站为研究对象,运用机器人控制器的PC SDK接口对工作站系统进行二次开发,研究了智能装配工作站的网络架构,并在C/S架构下设计工业机器人智能装配工作站远程监控方案,开发了智能装配工作站远程监控系统。实验结果表明:该系统能够有效完成对工作站运行状态的远程监控,实现对机器人远程操作及运行状态的获取。 展开更多
关键词 PC sDK C/s架构 远程监控 智能装配工作站
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基于SAO-VMD-S的双端柔性直流输电故障测距方案
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作者 王思华 王羚佰 《电力系统保护与控制》 北大核心 2025年第1期1-12,共12页
针对柔性直流输电线路故障定位过程中信号易受噪声干扰、耐过渡电阻能力差的问题,提出了采用小波变换(wavelet transform,WT)进行消噪处理、并结合变分模态分解(variational mode decomposition,VMD)的柔性直流输电线路故障定位方案。... 针对柔性直流输电线路故障定位过程中信号易受噪声干扰、耐过渡电阻能力差的问题,提出了采用小波变换(wavelet transform,WT)进行消噪处理、并结合变分模态分解(variational mode decomposition,VMD)的柔性直流输电线路故障定位方案。首先利用基于Logistic函数的循环位移小波阈值去噪对故障信号进行处理。然后采用雪消融优化器(snow ablation optimizer,SAO)结合VMD对信号进行有效分解。最后对分解后的高频分量进行S变换(S-transform,ST),选取对应频率下的幅值曲线进行波头标定。此外,提出了一种不依赖波速的测距算法。在PSCAD/EMTDC平台中搭建双端柔性直流系统并进行仿真验证。结果表明,所提方案不仅对采样率要求低,且能耐受300Ω的过渡电阻和30 dB的噪声,在不同故障距离下均能准确进行测距。 展开更多
关键词 柔性直流输电 小波去噪 雪消融优化器 变分模态分解 s变换 故障测距
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遗传性蛋白S缺乏症致兄弟二人患肺栓塞报告
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作者 胡建秋 乔华 《临床肺科杂志》 2025年第1期151-153,共3页
肺栓塞(pulmonary embolism, PE)是临床上常见的急危重症之一,具有致死性,由于症状及体征均不典型,常常导致漏诊、误诊。青少年肺栓塞性相对少见,更容易被临床医师忽视。但该类患者可能发病年龄早,应注重其求因的检查尤其遗传缺陷。本... 肺栓塞(pulmonary embolism, PE)是临床上常见的急危重症之一,具有致死性,由于症状及体征均不典型,常常导致漏诊、误诊。青少年肺栓塞性相对少见,更容易被临床医师忽视。但该类患者可能发病年龄早,应注重其求因的检查尤其遗传缺陷。本文通过报道兄弟患肺栓塞病例,最终确诊为遗传性蛋白S缺乏症,且为少见的复杂杂合变异病例,而提高临床医师对于青少年PE的诊治水平。 展开更多
关键词 肺栓塞 蛋白s缺乏 复杂杂合变异
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基于B/S架构的智慧农业管理系统的设计与实现
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作者 付世军 卢淞岩 +4 位作者 李梦 何震 袁佳阳 毕春兰 刘利 《湖北农业科学》 2025年第1期154-161,共8页
利用气象、小气候、土壤等农业大数据和专家总结的农业知识数据库,采用B/S架构,遵循前后端分离的MVC模式,以SpringBoot+MybatisPlus+VUE的前后端框架和分层架构模式为基础,运用HTML5、CSS3、JavaScript、AJAX、ECharts、云端存储OSS等... 利用气象、小气候、土壤等农业大数据和专家总结的农业知识数据库,采用B/S架构,遵循前后端分离的MVC模式,以SpringBoot+MybatisPlus+VUE的前后端框架和分层架构模式为基础,运用HTML5、CSS3、JavaScript、AJAX、ECharts、云端存储OSS等前端技术。结果表明,成功构建了“高内聚低耦合”的智慧农业管理系统,有效提高农业劳动生产率,促进耕地资源利用效率,助力中国农村经济振兴。 展开更多
关键词 智慧农业 B/s架构 数据融合 分层架构 阿里云
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