检索结果-南通市图书馆

Growth and aggregation of Cu nanocrystals on ionic liquid surfaces

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第6期29卷 394-398页

作者： Jia-Wei Shen xun-Heng ye Zhi-Long Bao Lu Li Bo Yang Xiang-Ming Tao Gao-Xiang ye Department of Physics Zhejiang UniversityHangzhou 310027China

We report a catalyst-free growth of Cu nanocrystals on ionic liquid surfaces by thermal evaporation method at room *** deposition of Cu on ionic liquid surfaces,ramified Cu aggregates *** is found that the aggregates are composed of both granules and nanocrystals with triangular or hexagonal *** sizes of the nanocrystals are in the range of tens to hundreds of nanometers and increase with the nominal deposition *** growth mechanism of the Cu aggregates and nanocrystals is presented.

关键词： ramified aggregates Cu nanocrystals liquid substrates critical state

Nucleation, Growth, and Aggregation of Au Nanocrystals on Liquid Surfaces

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2020年第2期37卷 74-77页

作者： Lu Li Zhi-Long Bao xun-Heng ye Jia-Wei Shen Bo Yang Gao-Xiang ye Xiang-Ming Tao Department of Physics Zhejiang UniversityHangzhou 310027

We report the formation of gold ramified aggregates after deposition of Au on an ionic liquid surface by thermal evaporation method at room *** is observed that the aggregates are composed of both granules and nanocrystals with hexagonal or triangular *** most probable size of the nanocrystals is much larger than that of the granules and it increases with the nominal deposition *** formation mechanism of the granules,nanocrystals and aggregates is presented.

关键词： temperature. nominal hexagonal

An MFC capable of regenerating the cathodic electron acceptor under sunlight

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2010年第9期53卷 2489-2494页

作者： FU Qian,LI Jun,ZHU xun,LIAO Qiang,ye DingDing & ZHANG Liang Institute of Engineering Thermophysics,Chongqing University,Chongqing 400030,China Institute of Engineering Thermophysics Chongqing University Chongqing China

A renewable MFC (microbial fuel cell) cathode was used in this study because the iodide ion could react with oxygen to generate triiodide under natural *** feasibility of the regeneration of triiodide ion under natural sunlight and the effect of the regenerated triiodide ion concentration on the MFC performance were *** results showed that the power density of the MFC using triiodide ion as cathodic electron acceptor was significantly higher than that of using ferricyanate,and that the iodide ion can be oxidized to triiodide ion by oxygen in air at the expense of natural *** addition,it was obvious from the experimental results that the MFC performance was improved with the increase of the triiodide concentration,indicating that the concentration of triiodide ion had a critical effect on the MFC *** linear sweep voltammetry (LSV) curves for the electro-reduction of triiodide ion on the carbon paper were obtained and the results suggested that the diffusion process of triiodide ions to cathode was the control factor for the MFC performance.

关键词： microbial fuel cell cathodic electron acceptor triiodide ion

Improvement of machine learning-based vertex reconstruction for large liquid scintillator detectors with multiple types of PMTs

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2022年第7期33卷 93-102页

作者： Zi-Yuan Li Zhen Qian Jie-Han He Wei He Cheng-Xin Wu xun-ye Cai Zheng-Yun You Yu-Mei Zhang Wu-Ming Luo School of Physics Sun Yat-Sen UniversityGuangzhou510275China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai519082China Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China

The precise vertex reconstruction for large liquid scintillator detectors is essential.A novel machine learning-based method was successfully developed to reconstruct an event vertex in *** this study,the performance of machine learning-based vertex reconstruction was further improved by optimizing the input images of neural *** separating the information of different types of PMTs and adding the information of the second hit of PMTs,the vertex resolution was improved by approximately 9.4% at 1 MeV and 9.8% at 11 MeV.

关键词： JUNO Liquid scintillator detector Neutrino experiment Vertex reconstruction Machine learning

Digital subtraction angiographic characteristics of progression of moyamoya disease 6 months prior to surgical revascularisation

在线全文

学校读者我要写书评

暂无评论

Stroke & Vascular Neurology 2020年第1期5卷 97-102页

作者： Peicong Ge Qian Zhang xun ye Xingju Liu Xiaofeng Deng Jia Wang Rong Wang Yan Zhang Dong Zhang Ji Zong Zhao Department of Neurosurgery Beijing Tiantan HospitalBeijingChina

background Evidence on the natural angiographic course of moyamoya disease(MMD)is *** takes about 6 months for waiting for revascularisation *** issue of when to perform subtraction angiography(DSA)for follow-up remains *** investigated the natural course of MMD by DSA and attempted to determine the best interval to perform the follow-up *** This is a single-centre cohort study of Chinese MMD inpatients treated from 1 January 2015 to 31 August *** angiographic findings were evaluated on Suzuki stage and collateral circulation between two follow-ups of the same *** A total of 110 patients who met the criteria were enrolled in this *** a median 6 months follow-up,five patients(4.5%)had progression,four females and one *** interval of progression ranged from 4 to 137 months with a mean of 61.4 *** five patients with progression,four had unilateral lesion(two ipsilateral and two contralateral)and one had bilateral *** circulation was changed in three of five *** The angiographic evidence of progression in MMD was rare in the short-term follow-up,and most patients with progression had initial unilateral *** re-examination may be not needed in patients with bilateral MMD,but needed in unilateral MMD.

关键词： involvement progression characteristics

Moyamoya disease associated with ankylosing spondylitis in a 9-year-old child:a case report

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Neurosurgical Journal 2017年第3期3卷 188-191页

作者： Fan Yang Peicong Ge xun ye Department of Neurosurgery Beijing Tiantan Hospital Capital Medical University China National Clinical Research Center for Neurological Diseases Beijing Key Laboratory of Translational Medicine for Cerebrovascular Disease 6 Tiantanxili DongCheng District Beijing 100050 China Center of Stroke Beijing Institute for Brain Disorders Beijing Key Laboratory of Translational Medicine for Cerebrovascular Disease 6 Tiantanxili DongCheng District Beijing 100050 China

Background: Ankylosing spondylitis was reported to associate with an increased risk of cerebrovascular diseases. In this article, we aimed to report the first case of ankylosing spondylitis associated with moyamoya disease treated with encephalo-duroarterio-synangiosis. Case presentation: A 9-year-old boy with ankylosing spondylitis appeared a symptom of repeated transient ischemic attacks which performed as left hemiparesis. Magnetic resonance angiography showed a typical finding of left anterior cerebral artery, bilateral middle cerebral arteries and the supraclinoid portion of the right internal carotid artery stenosis with an abnormal vascular network at the base of the brain, diagnosed with moyamoya disease. He received a medication treatment but did not underwent revascularization surgery. After three months, ankylosing spondylitis symptoms got some relief, whereas transient ischemic attacks was more frequency. Due to the bad cerebral blood flow on acetazolamide computed tomography perfusion and poor clinical manifestation, he underwent a right encephalo-duroarterio-synangiosis. Postoperatively, the symptoms of transient ischemic attacks disappeared. Conclusions: We reported the first case of ankylosing spondylitis associated with moyamoya disease. Moyamoya disease could appear in patients with ankylosing spondylitis. Revascularization surgery probably is an effective treatment for preventing preoperative ischemic events recurrence.

关键词： Ankylosing spondylitis Moyamoya disease Transient ischemic attack

Evaluation of intraoperative MRI-assisted stereotactic brain tissue biopsy: a singlecenter experience in China

在线全文

学校读者我要写书评

暂无评论

Chinese Neurosurgical Journal 2019年第1期5卷 13-20页

作者： Chang-yu Lu Zong-sheng Xu xun ye Department of Neurosurgery Peking University International HospitalBeijingChina Department of Neurosurgery Beijing Tiantan HospitalCapital Medical UniversityBeijingChina

Background:This study aimed to investigate the value of high field-strength intraoperative magnetic resonance imaging(iMRI)-guided stereotactic biopsy in the surgery of intracranial space-occupying ***:A total of 87 patients who underwent stereotactic biopsy of intracranial lesions in the Peking University International Hospital from March 2016 to August 2018 were retrospectively surveyed;among these,50 patients underwent MRI-guided stereotactic biopsy using the Leksell frame(iMRI group)and 37 cases received traditional stereotactic biopsy using the Leksell frame(control group).The accuracy rates and complications of the two groups were ***:A 100%positive diagnosis was observed in all cases(n=50)in the iMRI *** 4 cases,the biopsy site was clearly found to have deviated from the target point,and the biopsy was performed *** control group had 33 cases(86.5%)with positive *** severe complications like neural functional deficit were observed in the iMRI group,while two patients developed bleeding at the puncture site(1 case receiving surgery to remove the hematoma)in the control *** were no deaths in either ***:iMRI-assisted stereotactic biopsy can confirm the target position and adjust the puncture path in real *** to the traditional stereotactic biopsy technique,the iMRI method has a higher positive diagnostic rate,though surgical trauma and complications have no significant difference.

关键词： High field-strength Stereotactic technique Brain biopsy Intraoperative magnetic resonance

Centrifuge model tests of the formation mechanism of coarse sand debris flow

在线全文

学校读者我要写书评

暂无评论

Journal of Chongqing University 2014年第3期13卷 77-89页

作者：周建周韵鸿 LI ye-xun WANG Zi-han Department of Geotechnical Engineering Tongji University Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji University The Second Engineering Company of CCCC Third Harbor Engineering Co.Ltd. School of civil engineering Hebei University of Technology

Using the self-developed visualization test apparatus, centrifuge model tests at 20 g were carried out to research the macro and microscopic formation mechanism of coarse sand debris flows. The formation mode and soil-water interaction mechanism of the debris flows were analyzed from both macroscopic and microscopic points of view respectively using high digital imaging equipment and micro-structure analysis software Geodip. The test results indicate that the forming process of debris flow mainly consists of three stages, namely the infiltration and softening stage, the overall slide stage, and debris flow stage. The essence of simulated coarse sand slope forming debris flow is that local fluidization cause slope to wholly slide. The movement of small particles forms a transient stagnant layer with increasing saturation, causing soil shear strength lost and local fluidization. When the driving force of the saturated soil exceeds the resisting force, debris flow happens on the coarse sand slope immediately.

关键词： coarse sand debris flow centrifuge model tests formation mode water-soil interaction mechanism

Clinical and pathological changes in cerebral arteriovenous malformations after stereotactic radiosurgery failure

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2008年第12期121卷 1076-1079页

作者： LIU Wei-ming ye xun ZHAO Yuan-li WANG Shuo ZHAO Ji-zong Department of Neurosurgery Beijing Tiantan Hospital Capital Medical University Beijing 100050 China

Background Stereotactic radiosurgery is an altemative to resection of intracranial cerebral arteriovenous malformations （AVMs）, while it will fail in some cases. This study aimed to evaluate the changes after stereotactic radiosurgery for AVMs.Methods Nineteen cases with cerebral AVMs had failure after stereotactic radiosurgery therapy. The symptoms and angiography were assessed. All patients underwent microsurgery. Pathologic examination was performed for all cases and electron microscopic examination was carried out in 6 patients.Results Seven cases had hemorrhage from 12 to 98 months after stereotactic radiosurgery, 5 had headache, 4 had refractory encephalon edema, 2 had epilepsy as a new symptom and 1 had a pressure cyst 5 years after radiosurgery. Angiography in 18 cases, 8-98 months after radiation therapy, demonstrated no significant changes in 5 cases, slight reduction in 9, near complete obliteration in 1 and complete obliteration in 3. An abnormal vessel was found on pathologic examination in 17 cases, even one case had obliterated in angiography. Electron microscopy examination showed vessel wall weakness, but the vessels remained open and blood circulated. One case died because of a moribund state before surgery. The other 18 cases had no new neurological deficiencies, seizure control and no hemorrhage occurred after microsurgery at an average follow-up of 3 years.Conclusion Stereotactic radiotherapy for AVMs should have a long period follow-up. If serious complications occur, microsurgery can be performed as salvage treatment.

关键词： cerebral arteriovenous malformations stereotactic radiosurgery microsurgery complications