为了保障桥梁结构正常运营,及时发现桥梁损伤,本文提出了多阶曲率模态差(multi order curvature mode difference,简称MOCMD)损伤指标进行桥梁结构损伤位置的识别。为了验证本文方法的有效性,通过数值模拟建立一简支梁桥有限元模型,研...为了保障桥梁结构正常运营,及时发现桥梁损伤,本文提出了多阶曲率模态差(multi order curvature mode difference,简称MOCMD)损伤指标进行桥梁结构损伤位置的识别。为了验证本文方法的有效性,通过数值模拟建立一简支梁桥有限元模型,研究不同损伤程度、损伤位置和噪声水平对该指标的影响。数值模拟结果表明,该指标能够精确识别多个工况损伤位置,而且具有一定抗噪性。展开更多
Objective： To compare the effects of electroacupuncture （EA） and mild-warm moxibustion （Mox） therapies for constipation-predominant irritable bowel syndrome （C-IBS） patients. Methods： Sixty C-IBS patients were...Objective： To compare the effects of electroacupuncture （EA） and mild-warm moxibustion （Mox） therapies for constipation-predominant irritable bowel syndrome （C-IBS） patients. Methods： Sixty C-IBS patients were assigned to 2 groups by simple randomized method, i.e. EA group （30 cases） and Mox group （30 cases）. Both EA and Mox treatments were performed on bilateral Tianshu （ST 25） and Shangjuxu （ST 37） for 30 min each time, 6 times per week, for 4 consecutive weeks. The gastrointestinal symptoms and psychological symptoms of the two groups were scored before and after treatment. The effects on the corresponding functional brain areas, namely the anterior cingulate cortex （ACC）, insular cortex （IC） and prefrontal cortex （PFC） were observed by functional magnetic resonance imaging （fMRI） before and after treatment. Results： Compared with the Mox group, greater improvements in abdominal distension, defecation frequency, difficulty in defecation and stool features were observed in the EA group （all P〈0.01）, both Hamilton Anxiety Rating Scale and Hamilton Depression Rating Scale scores were significantly decreased in the EA group （all P〈0.01）. Finally, decreased activated voxel values were observed in the ACC, right IC and PFC brain regions of EA group with 150 mL colorectal distension stimulation （P〈0.05 or P〈0.01）. Conclusions： Both EA and Mox could significantly improve some of the most intrusive symptoms of C-IBS patients, and EA was more effective than Mox. The therapeutic effect of these two therapies might through modulating of the brain-gut axis function. （Registration No. ChiCTR- TRC-11001349）.展开更多
Background The Dextroscope system by Volume Interactions （Singapore） had been applied to minimally invasive neurosurgery in many units. This system enables the neurosurgeon to interact intuitively with the three-dim...Background The Dextroscope system by Volume Interactions （Singapore） had been applied to minimally invasive neurosurgery in many units. This system enables the neurosurgeon to interact intuitively with the three-dimensional graphics in a direct manner resembling the way one communicates with the real objects. In the paper, we explored its values in pre-operation surgical planning for intracranial meningiomas resection. Methods Brain computed tomography （CT）, magnetic resonance imaging （MRI）, and magnetic resonance venography （MRV） were performed on 10 patients with parasagittal and falcine meningiomas located on central groove area; brain CT, MRI and magnetic resonance angiography （MIRA） were performed on 10 patients with anterior skull base meningiomas and 10 patients with sphenoid ridge meningiomas. All these data were transferred to Dextroscope virtual reality system, and reconstructed. Then meningiomas, skull base, brain tissue, drainage vein and cerebral arteries were displayed within the system, and their anatomic relationships were evaluated. Also, the simulation operations were performed. Results For parasagittal and falcine meningiomas, the relationships of tumor with drainage vein and superior sagittal sinus were clearly displayed in the Dextroscope system. For anterior skull base and sphenoid ridge meningiomas, the relationships of tumor with bilateral internal carotid arteries, anterior cerebral arteries, middle cerebral arteries and skull base were vividly displayed within the virtual reality system. Surgical planning and simulation operation of all cases were performed as well. The real operations of all patients were conducted according to the simulation with well outcomes. Conclusions According to the virtual reality planning, neurosurgeons could get more anatomic information about meningioma and its surrounding structures, especially important vessels, and choose the best approach for tumor resection, which would lead to better prognosis for patients.展开更多
文摘为了保障桥梁结构正常运营,及时发现桥梁损伤,本文提出了多阶曲率模态差(multi order curvature mode difference,简称MOCMD)损伤指标进行桥梁结构损伤位置的识别。为了验证本文方法的有效性,通过数值模拟建立一简支梁桥有限元模型,研究不同损伤程度、损伤位置和噪声水平对该指标的影响。数值模拟结果表明,该指标能够精确识别多个工况损伤位置,而且具有一定抗噪性。
基金Supported by the National Natural Science Foundation of China(No.30973784)the National Basic Research Program of China,973 program(No.2009CB522900)
文摘Objective： To compare the effects of electroacupuncture （EA） and mild-warm moxibustion （Mox） therapies for constipation-predominant irritable bowel syndrome （C-IBS） patients. Methods： Sixty C-IBS patients were assigned to 2 groups by simple randomized method, i.e. EA group （30 cases） and Mox group （30 cases）. Both EA and Mox treatments were performed on bilateral Tianshu （ST 25） and Shangjuxu （ST 37） for 30 min each time, 6 times per week, for 4 consecutive weeks. The gastrointestinal symptoms and psychological symptoms of the two groups were scored before and after treatment. The effects on the corresponding functional brain areas, namely the anterior cingulate cortex （ACC）, insular cortex （IC） and prefrontal cortex （PFC） were observed by functional magnetic resonance imaging （fMRI） before and after treatment. Results： Compared with the Mox group, greater improvements in abdominal distension, defecation frequency, difficulty in defecation and stool features were observed in the EA group （all P〈0.01）, both Hamilton Anxiety Rating Scale and Hamilton Depression Rating Scale scores were significantly decreased in the EA group （all P〈0.01）. Finally, decreased activated voxel values were observed in the ACC, right IC and PFC brain regions of EA group with 150 mL colorectal distension stimulation （P〈0.05 or P〈0.01）. Conclusions： Both EA and Mox could significantly improve some of the most intrusive symptoms of C-IBS patients, and EA was more effective than Mox. The therapeutic effect of these two therapies might through modulating of the brain-gut axis function. （Registration No. ChiCTR- TRC-11001349）.
基金This study was supported by grants from the National Natural Science Foundation of China （No. 30872675 and No. 30901549）, Shanghai Committee of Science and Technology （No. 08411965100）, and 2011 Shanghai Medical College Young Scientist Fund of Hehai University （No. 11L-24）.
文摘Background The Dextroscope system by Volume Interactions （Singapore） had been applied to minimally invasive neurosurgery in many units. This system enables the neurosurgeon to interact intuitively with the three-dimensional graphics in a direct manner resembling the way one communicates with the real objects. In the paper, we explored its values in pre-operation surgical planning for intracranial meningiomas resection. Methods Brain computed tomography （CT）, magnetic resonance imaging （MRI）, and magnetic resonance venography （MRV） were performed on 10 patients with parasagittal and falcine meningiomas located on central groove area; brain CT, MRI and magnetic resonance angiography （MIRA） were performed on 10 patients with anterior skull base meningiomas and 10 patients with sphenoid ridge meningiomas. All these data were transferred to Dextroscope virtual reality system, and reconstructed. Then meningiomas, skull base, brain tissue, drainage vein and cerebral arteries were displayed within the system, and their anatomic relationships were evaluated. Also, the simulation operations were performed. Results For parasagittal and falcine meningiomas, the relationships of tumor with drainage vein and superior sagittal sinus were clearly displayed in the Dextroscope system. For anterior skull base and sphenoid ridge meningiomas, the relationships of tumor with bilateral internal carotid arteries, anterior cerebral arteries, middle cerebral arteries and skull base were vividly displayed within the virtual reality system. Surgical planning and simulation operation of all cases were performed as well. The real operations of all patients were conducted according to the simulation with well outcomes. Conclusions According to the virtual reality planning, neurosurgeons could get more anatomic information about meningioma and its surrounding structures, especially important vessels, and choose the best approach for tumor resection, which would lead to better prognosis for patients.
