检索结果-南通市图书馆

Biomedical and Environmental Sciences 2023年第11期36卷 1084-1089页

作者： li yu jian KAN Xuan Department of Pediatrics General Hospital of Tianjin Medical UniversityTianjin 300052China

Caesarean section is a well-established surgical procedure that allows for maximum fetal rescue under special circumstances,such as intrauterine distress and intrauterine hypoxia,and minimizes injuries to pregnant women who cannot tolerate vaginal *** caesarean section is a special type of caesarean section that plays an important role in protecting the lives of pregnant mothers and fetuses[1].

关键词： Blood injuries Emergency

Experimental and theoretical analysis on the procedure for estimating geo-stresses by the Kaiser effect

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2010年第5期17卷 514-518页

作者： yuan-hui li yu-jiang Yang jian-po liu Xing-dong Zhao College of Resources and Civil Engineering Northeastern University Shenyang 110004 China

Acoustic emission tests of the core specimens retrieved from boreholes at the depth over 1000 m in Hongtoushan Copper Mine were carried out under uniaxial compressive loading, and the numerical test was also done by using the rock failure process analysis （RFPA2D） code, based on the procedure for estimating geo-stresses by the Kaiser effect under uniaxial compression. According to the statistical damage mechanics theory, the Kaiser effect mechanism was analyzed. Based on these analyses, it is indicted that the traditional method of estimating geo-stresses by the Kaiser effect is not appropriate, and the result is usually smaller than the real one. Furthermore, the greater confining compression in the rock mass may result in a larger difference between the Kaiser effect stresses acquired from uniaxial loading in laboratory and the real in-situ stresses.

关键词： rock stresses Kaiser effect cyclic loading acoustic emission

Generation of Four-Mode Cluster-Type Entangled Coherent States in Free-Traveling Optical Fields

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2011年第3期55卷 426-430页

作者： HE Dai-Guo DONG yu-li FANG jian-Xing QIAN li HU Jie School of Physical Science and Technology Suzhou University Suzhou 215006 China

In this paper, we propose an optical scheme to generate four-mode cluster-type entangled coherent states （ECSs） in free traveling optical fields by using two single-photon sources, coherent state sources, beam splitters, pho- todetectors, cross-Kerr media, and phase shifters. And the success probability of the states preparation is calculated. At last we discuss the experimental feasibility of such proposal.

关键词： cluster states coherent states beam splitters cross-Kerr media

Mechanisms of secondary damage to the thalamic nucleus and substantia nigra in an adult hypertensive rat model following middle cerebral artery occlusion

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

Neural Regeneration Research 2010年第11期5卷 853-858页

作者： li Xiong jian yu Songjie liao Shihui Xing Zhan Zhao Jinsheng Zeng Stroke Center and Department of Neurology First Affiliated Hospital Sun Yat-Sen University Guangzhou 510080 Guangdong ProvinceChina

BACKGROUND： Following ischemia, apoptosis is observed at the ipsilateral ventropostenor thalamic nucleus and substantia nigra, which are distant from, but connected to, the ischemic cerebral cortex, in animals with normotension. However, secondary brain damage in hypertension has not been clearly investigated. OBJECTIVE： The present study determined whether neuronal apoptosis is associated with neuronal loss in the ipsilateral ventroposterior thalamic nucleus and substantia nigra following cortical ischemia in adult hypertensive rats. Results should provide options for determining a time window for anti-apoptotic therapy. DESIGN, TIME AND SETTING： All experimental procedures in this randomized, controlled trial were conducted at the Neurological Laboratory of the First Affiliated Hospital of Sun Yat-sen University of China between October 2006 and July 2008. MATERIALS： Monoclonal primary antibodies specific to mouse anti-rat microtubule-associated protein 2 and glial fibrillary acidic protein were respectively purchased from Sigma Chemical, USA and BD Pharmingen, USA. Terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate-biotin nick end-labeling （TUNEL） detection kits were purchased from Roche Applied Science, Switzerland and Upstate, USA, respectively. METHODS： A total of 64 male, Sprague Dawiey rats, aged 60-90 days, were equally and randomly divided into middle cerebral artery occlusion and sham surgery groups. Renovascular hypertension was established in both groups by renal artery occlusion. Right distal middle cerebral artery occlusion was performed by electrocoagulation in the middle cerebral artery occlusion group. MAIN OUTCOME MEASURES： Microtubule-associated protein 2 and glial fibrillary acidic protein were detected by immunohistochemistry, and apoptotic cells were observed by TUNEL assay. The stainings were separately detected in the ipsilateral ventroposterior thalamic nucleus and substantia nigra. RESULTS： During the 4 weeks followin

关键词： ventroposterior thalamic nucleus substantia nigra apoptosis rats cerebral infarction neural regeneration

An Exact Numerical Approach to Calculate the First Passage Time for General Random Walks on a Network

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第11期30卷 41-43页

作者： XIE Yan-Bo li yu-jian li Ming XI Zhen-Dong WANG Bing-Hong Department of Modern Physics University of Science and Technology of ChinaHefei 230026 Department of Satellite Measurement and Control on Sea of China Jiangyin 214400 College of Physics and Electronic Information Engineering Wenzhou UniversityWenzhou 325035 School of Science Southwest University of Science and TechnologyMianyang 621010

We present an exact numerical method to calculate the mean first passage time for the random walk on the network between any source node and any target which contains an arbitrary number of *** the network with the average degree~O(1)and the effective diameter D~lnN or less,the efficiency of our numerical approach is found to exceed all other general numerical methods presented in the *** method can also calculate the average of any function of the first passage time,provided it is finite.

关键词： numerical arbitrary exact

Establishment and reliability evaluation of the design space for HPLC analysis of six alkaloids in Coptis chinensis(Huanglian) using Bayesian approach

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Natural Medicines 2016年第9期14卷 697-708页

作者： DAI Sheng-yun XU Bing ZHANG Yi li jian-yu SUN Fei SHI Xin-yuan QIAO Yan-jiang Research Center of Traditional Chinese Medicine Information Engineering Beijing University of Chinese Medicine Engineering Research Center of Key Technologies for Chinese Medicine Production and New Drug Development Ministry of Education

Coptis chinensis(Huanglian) is a commonly used traditional Chinese medicine(TCM) herb and alkaloids are the most important chemical constituents in it. In the present study, an isocratic reverse phase high performance liquid chromatography(RP-HPLC) method allowing the separation of six alkaloids in Huanglian was for the first time developed under the quality by design(Qb D) principles. First, five chromatographic parameters were identified to construct a Plackett-Burman experimental design. The critical resolution, analysis time, and peak width were responses modeled by multivariate linear regression. The results showed that the percentage of acetonitrile, concentration of sodium dodecyl sulfate, and concentration of potassium phosphate monobasic were statistically significant parameters(P lied to further evaluate the interactions between the three parameters on selected responses. Full quadratic models were built and used to establish the analytical design space. Moreover, the reliability of design space was estimated by the Bayesian posterior predictive distribution. The optimal separation was predicted at 40% acetonitrile, 1.7 g·m L-1of sodium dodecyl sulfate and 0.03 mol·m L-1 of potassium phosphate monobasic. Finally, the accuracy profile methodology was used to validate the established HPLC method. The results demonstrated that the Qb D concept could be efficiently used to develop a robust RP-HPLC analytical method for Huanglian.

关键词： Coptis chinensis Quality by Design(Qb D) Bayesian approach Analytical design space Accuracy profile

能谱CT水-肌物质分离技术评估青年慢性非特异性腰痛椎旁肌水含量

在线全文

学校读者我要写书评

暂无评论

中国CT和MRI杂志 2025年第1期23卷 177-179页

作者：周晓娜罗慕晴刘音其向剑钟泽亚黎建宇张堃湖南中医药大学第一附属医院放射影像科湖南长沙410007 湖南中医药大学中西医结合学院湖南长沙410208

目的通过能谱CT水-肌物质分离技术比较慢性非特异性下腰痛(CNLBP)青年患者的椎旁肌水含量变化,并评估椎旁肌水含量诊断青年CNLBP的价值。方法本项研究前瞻性招募56名CNLBP患者和54例健康志愿者进行能谱CT成像,获取L1~L4椎体水平竖脊肌... 详细信息

目的通过能谱CT水-肌物质分离技术比较慢性非特异性下腰痛(CNLBP)青年患者的椎旁肌水含量变化,并评估椎旁肌水含量诊断青年CNLBP的价值。方法本项研究前瞻性招募56名CNLBP患者和54例健康志愿者进行能谱CT成像,获取L1~L4椎体水平竖脊肌及L2~L5椎体水平多裂肌水含量。采用独立样本t检验分析两组间水含量的差异,以临床诊断为标准,绘制受试者工作特征(ROC)曲线,计算曲线下面积(AUC),评估椎旁肌水含量诊断青年CNLBP的效能。结果 CNLBP患者各椎体层面竖脊肌及多裂肌水含量均高于于健康志愿者。CNLBP患者于L4及L5椎体多裂肌水平高于健康志愿者,差异具统计学意义(t=2.48,P=0.015;t=4.41,P<0.001)。L4、L5层面多裂肌水含量诊断青年CNLBP的AUC分别为0.633、0.729。结论能谱CT水-肌物质分离技术可以敏感、定量评估CN LBP青年患者椎旁肌水含量升高的改变,可为CNLBP的诊断与治疗评估提供一定的临床价值。

关键词：能谱CT 竖脊肌多裂肌慢性非特异性下腰痛

维普期刊数据库博看期刊

Resistance of Cement-based Grouting Materials with Nano- SiO_(2) Emulsion to Chloride Ion Penetration

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 114-119页

作者： li Shuiping CHENG jian WEI Chao yuAN Bin yu Chengxiao College of Architectural Science and Engineering Yangzhou UniversityYangzhou 225127China

The chloride penetration resistance of cement-based grout materials was improved by nano-silica *** of mixtures containing different nano-silica particles or emulsions were exposed in sodium chloride solutions of specific concentrations with different test *** properties of the mixes were assessed in terms of weight loss and compressive strength.X-ray diffraction(XRD)and scanning electron microscopy(SEM)of mixes were performed to analysis the phase evolution and *** results demonstrated that the introduction of nano-SiO_(2) emulsion significantly decreased the compressive strength loss and calcium hydroxide(CH)crystal content of hydration production,and then enhanced the resistance of cement-based grouting materials to chloride ion *** improvement derives from the filling and pozzolanic effects of nano-SiO_(2) particles,which were incorporated via an emulsion and attributed to a well dispersion in grouting matrix.

关键词： grouting materials nano-SiO_(2)emulsion chloride ion penetration,weight loss strength loss

Neuronal firing in the globus pallidus internus and the ventrolateral thalamus related to parkinsonian motor symptoms

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2009年第19期122卷 2308-2314页

作者： CHEN Hai ZHUANG Ping ZHANG yu-qing li jian-yu li Yong-jie Beijing Institute of Functional Neurosurgery Department of Neurology Xuanwu Hospital Capital Medical University Beijing 100053 China

Background It has been proposed that parkinsonian motor signs result from hyperactivity in the output nucleus of the basal ganglia, which suppress the motor thalamus and cortical areas. This study aimed to explore the neuronal activity in the globus pallidus internus （GPi） and the ventrolateral thalamic nuclear group （ventral oral posterior/ventral intermediate, Vop/Vim） in patients with Parkinson＇s disease （PD）. Methods Twenty patients with PD who underwent neurosurgery were studied. Microelectrode recording was performed in the GPi （n=10） and the Vop/Vim （n=10） intraoperatively. Electromyography （EMG） contralateral to the surgery was simultaneously performed. Single unit analysis was carried out. The interspike intervals （ISI） and coefficient of variation （CV） of ISI were calculated. Histograms of ISI were constructed. A unified Parkinson＇s disease rating scale （UPDRS） was used to assess the clinical outcome of surgery. Results Three hundred and sixty-three neurons were obtained from 20 trajectories. Of 175 GPi neurons, there were 15.4% with tremor frequency, 69.2% with tonic firing, and 15.4% with irregular discharge. Of 188 thalamic neurons, there were 46.8% with tremor frequency, 22.9% with tonic firing, and 30.3% with irregular discharge. The numbers of three patterns of neuron in GPi and Vop/Vim were significantly different （P 〈0.001）. ISI analysis revealed that mean firing rate of the three patterns of GPi neurons was （80.9±63.9） Hz （n=78）, which was higher than similar neurons with 62.9 Hz in a normal primate. For the Vop/Vim group, ISI revealed that mean firing rate of the three patterns of neurons （n=95） was （23.2±17.1） Hz which was lower than similar neurons with 30 Hz in the motor thalamus of normal primates. UPDRS indicated that the clinical outcome of pallidotomy was （64.3±29.5）%, （83.4±19.1）% and （63.4±36.3）%, and clinical outcome of thalamotomy was （92.2±12.9）%, （68.0±25.2）% and （44.3±7.2）% for tremor, rigidity and bradykinesia, respectively. A sign

关键词： Parkinson's disease movement disorders globus pallidus thalamus microelectrodes

在线全文

学校读者我要写书评

暂无评论

二维隐马尔可夫模型的几个等价定义

北京工业大学学报 2008年第6期34卷 652-657页

作者：李玉鑑北京工业大学计算机学院北京100022

为了对一般二维隐马尔可夫模型建立严格的形式化定义,在参照低阶二维隐马尔可夫模型定义的基础上,通过对高阶模型进行分析,总结了一般二维隐马尔可夫模型的5个形式化定义,并证明了它们之间的等价性.这些等价性结果有助于加深对二维隐马... 详细信息

为了对一般二维隐马尔可夫模型建立严格的形式化定义,在参照低阶二维隐马尔可夫模型定义的基础上,通过对高阶模型进行分析,总结了一般二维隐马尔可夫模型的5个形式化定义,并证明了它们之间的等价性.这些等价性结果有助于加深对二维隐马尔可夫模型本质的理解,为进一步研究提供严格的形式化基础.

关键词：统计方法马尔可夫过程等价定义