检索结果-南通市图书馆

Multi-objective dynamic detection of seeds based on machine vision

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2007年第2期17卷 217-221页

作者： XUN Yi, zhang Junxiong, li wei and CAI weiguo ( College of Engineering, China Agricultural University, Beijing 100083, China College of Science, Dalian Fisheries University, Dalian 116023, China) [a]College of Engineering China Agricultural University Beijing China [b]College of Science Dalian Fisheriers University Dalian China

An approach to inspecting massive numbers of moving seeds was studied based on the techniques of dynamic inspection and machine vision. A progressive scanning CCD camera with external trigger function was used for real-time capture of dynamic images of seeds. The methods based on R channel of RGB (Red, Green and Blue) and region-dependent segmentation were adopted to reduce the data size of image processing and improve the efficiency of seeds inspection. All the seeds were sorted into four grades according to their morphological characteristics, such as surface area, perimeter, major axis, minor axis, circularity and eccentricity. The detection experiments indicated that the eligible ratio of the classifications was about 81.90% by this real-time inspection system.

关键词： machine vision seed sorting multi-objective morphological parameter.

亲和毛细管电泳法和荧光法研究氟喹诺酮类药物与牛血清白蛋白的相互作用

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

高等学校化学学报 2008年第4期29卷 694-699页

作者：张黎伟张新祥北京大学化学与分子工程学院北京100871

分别采用亲和毛细管电泳法和荧光法对6种氟喹诺酮类药物(司帕沙星、洛美沙星、左氧氟沙星、诺氟沙星、培氟沙星和氟罗沙星)与牛血清白蛋白的相互作用进行考察.结合比均为1∶1,结合常数在104L/mol量级,热力学参数表明体系间的相互作用力... 详细信息

分别采用亲和毛细管电泳法和荧光法对6种氟喹诺酮类药物(司帕沙星、洛美沙星、左氧氟沙星、诺氟沙星、培氟沙星和氟罗沙星)与牛血清白蛋白的相互作用进行考察.结合比均为1∶1,结合常数在104L/mol量级,热力学参数表明体系间的相互作用力以范德华作用力和氢键力为主.另外,亲和毛细管电泳实验结果表明,缓冲溶液pH值和离子强度增大会造成结合常数在一定程度上的减小,使相互作用减弱.同时,荧光猝灭实验结合紫外光谱扫描说明体系间为静态猝灭.所得到的数据对进一步研究氟喹诺酮类药物的作用机理、提高药效和开发新一代氟喹诺酮类药物具有一定的参考意义.

关键词：亲和毛细管电泳荧光光谱法氟喹诺酮牛血清白蛋白相互作用

Frontolateral Approach Applied to Sellar Region Lesions： A Retrospective Study in 79 Patients

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2016年第13期129卷 1558-1564页

作者： Hao-Cheng liu Zhen Wu liang Wang Xin-Ru Xiao Da li Wang Jia li-wei zhang Jun-Ting zhang Department of Neurosurgery Beijing Tian Tan Hospital Capital Medical University Beijing 100050 China Department of Neurosurgery Beijing Tong Ren Hospital Capital Medical University Beijing 100730 China

Background： Various surgical approaches for the removal of sellar region lesions have previously been described. This study aimed to evaluate the reliability and safety of the frontolateral approach （FLA） to remove sellar region lesions. Methods： We presented a retrospective study of 79 patients with sellar region lesions who were admitted and operated by the FLA approach from August 2011 to August 2015 in Department of Neurosurgery of Beijing Tian Tan Hospital. We classified FLA into three types, compared the FLA types to the areas of lesion invasion, and analyzed operation bleeding volume, gross total resection （GTR） rate, visual outcome, and mortality. Results： Seventy-nine patients were followed up from 2.9 to 50.3 months with a mean follow-up of 20.5 months. There were 42 cases of meningiomas, 25 cases of craniopharyngiomas, and 12 cases of pituitary adenomas. The mean follow-up Karnofsky Performance Scale was 90.4. GTR was achieved in 75 patients （94.9%）. Two patients （2.5%） had tumor recurrence. No patients died perioperatively or during short-term follow-up. Three patients （3.8%） with craniopharyngioma died 10, 12, and 23 months, respectively, after surgery. The operative bleeding volume of this study was no more than that of the other approaches in the sellar region （P = 0.783）. In this study, 35 patients （44.3%） had visual improvement after surgery, 38 patients （48.1%） remained unchanged, and three patients＇ visual outcome （3.8%） worsened. Conclusions： FLA was an effective approach in the treatment of sellar region lesions with good preservation of visual function. FLA classification enabled tailored craniotomies for each patient according to the anatomic site of tumor invasion. This study found that FLA had similar outcomes to other surgical approaches of sellar region lesions.

关键词： Craniopharyngioma Meningioma Neurosurgery Procedures Pituitary Neoplasms Skull Base

Optimal microsurgical treatment of dorsum sellae meningioma

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2009年第16期122卷 1857-1861页

作者： GENG Su-min zhang Jun-ting zhang li-wei WU Zhen WANG Zhong-cheng Department of Neurosurgery Beijng Tiantan Hospital Capital Medical University Beijing 100050 China

Background There are few reports of microsurgical treatment of dorsum sellae meningiomas--which, because of location, size, and differences in growth direction, clinical presentations, degree of surgical difficulty, have varied posttreatment sequelae. In pursuit of an optimal microsurgical treatment option for dorsum sellae meningioma patients, we performed a retrospective analysis of eight microsurgery-treated patients in our set up. Methods Clinical data of eight microsurgery-treated dorsum sellae meningioma patients were analyzed. Dorsum sellae meningiomas were classified into 2 types based on tumor location, size, and direction of growth. Type Ⅰ tumors （dorsum sellae-inferior third ventricle type, four cases） were resected by craniotomy via the frontotemporal or orbitozygomatic approach. Type Ⅱ tumors （dorsum sellae-third ventricle type, 4 cases） were resected by frontal craniotomy via the transcallosal-interforniceal approach. Results Complete tumor resection was achieved in all the eight patients. In Type Ⅰ tumor patients, the only postoperative complication was oculomotor nerve palsy. In Type Ⅱ tumor patients, the postoperative complications included hyperthermia, electrolyte imbalances, endocrinologic disturbances, and hydrocephalus. The mean follow-up was 2.1 years. Four patients returned to normal life and found a job, two were able to live independently, one required assistance, while one died. Conclusions Dorsum sellae meningioma surgery is challenging, and resection of Type Ⅱ tumors is more difficult than Type Ⅰ tumors. The selection of a suitable microsurgical approach based on tumor type, and the active treatment of postoperative complications are important means of increasing therapeutic efficacy.

关键词： dorsum sellae meningioma microsurgery

Surgical treatment for thoracic hydatidosis: review of 1230 cases

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2005年第19期118卷 1665-1667页

作者： WU Ming-bai zhang li-wei ZHU Hui and QIAN Zhong-xi Department of Thoracic Surgery First Affiliated Hospital XinjiangMedical University Urumchi 830000 China

Hydatid disease, a serious health problem, is endemic in many sheep and cattle raising areas. Though many kinds of medicines were used experimentally, operation is the only effective treatment for thoracic hydatidosis. The surgical treatments of 1230 patients with the disease in our division between June 1957 and December 2002 are discussed below.

关键词： thorax hydatidosis surgery

Design and implementation of web fast sharing platform of massive geological map

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

Global Geology 2012年第2期15卷 114-119页

作者： YAN Yan XUE linfu zhang wei li Wenqing College of Earth Sciences Jilin University Changchun 130026 China

It is still a laborious work to consult massive multidisciplinary geological maps which are scattered in different geological departments,and hard to give full play to the potential application value of geological map. Along with the network,the development of communication and computer technology,especially with the Web2.0 technology arisen,provides opportunities to the web for sharing of geological maps. Web fast sharing platform of massive geological maps( WSPGM) is based on the Flex technology development,using B/S architecture,with map navigation,search,display,security and other functions of the software system. Through the map pretreatment and asynchronous communication the system can display any size of geological map,and through the range limits,rights management,sharing system and watermark logo to take effective security on geological map. On the basis of this system,with the Jilin University web sharing system of geological map,the system can greatly improve the efficiency of using geological map. for research.

关键词： geological map sharing platform WSPGM

Gut bacteria alteration in obese people and its relationshipwith gene polymorphism

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2011年第8期17卷 1076-1081页

作者： Hao-Jiang Zuo Zhi-Mei Xie wei-wei zhang Yong-Ru li wei Wang Xiao-Bei Ding Xiao-Fang Pei Department ofMedical Technology West China School of Public Health Sich-uan University Chengdu 610041 Sichuan Province China

AIM:To investigate the differences in cultivable gut bacteria and peroxisome proliferator-activated receptor γ2(PPAR-γ2) gene Pro12Ala variation in obese and normal-weight Chinese ***:Using culture methods,the amounts of Escherichia coli,Enterococci,Bacteroides,Lactobacilli,Bif idobacteria and Clostridium perfringens(***) in the feces of 52 obese participants [body mass index(BMI):≥ 28 kg/m2] and 52 participants of normalweight(BMI:18.5-24 kg/m2) were *** participants completed comprehensive questionnaires and underwent clinical laboratory *** polymerase chain reaction-restriction fragment length polymorphism(PCR-PFLP) assay was used to analyze PPAR-γ2 gene Pro12Ala ***:The obese group exhibited a lower amount of ***(6.54 ± 0.65 vs 6.94 ± 0.57,P = 0.001)and Bacteroides(9.81 ± 0.58 vs 10.06 ± 0.39,P = 0.012) than their normal-weight *** major differences were observed in Pro12Ala genotype distribution between the two groups;however,obese individuals with a Pro/Ala genotype had a signif icantly lower level of Bacteroides(9.45 ± 0.62 vs 9.93 ± 0.51,P = 0.027) than those with a Pro/Pro *** addition,the obese group demonstrated a higher stool frequency(U = 975,P weight ***:Our results indicated interactions among cultivable gut flora,host genetic factors and obese phenotype and this might be helpful for obesity prevention.

关键词： Obesity Human gut flora Culture methods Gene polymorphism Peroxisome proliferator-activated receptor γ2

以出版物国际交换为媒介的政府出版物海外传播机制研究

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

图书馆 2017年第3期 101-105,111页

作者：张玮李伟国家图书馆北京100081

我国政府出版物海外传播工作存在相关概念缺失、无效信息杂糅、馆配商利益驱动不足等难点。海外部分国家图书馆,如美国国会图书馆、日本国立国会图书馆、韩国国立中央图书馆在本国政府出版物国际交换方面均有相关实践。结合我国政府出... 详细信息

我国政府出版物海外传播工作存在相关概念缺失、无效信息杂糅、馆配商利益驱动不足等难点。海外部分国家图书馆,如美国国会图书馆、日本国立国会图书馆、韩国国立中央图书馆在本国政府出版物国际交换方面均有相关实践。结合我国政府出版物市场的特点,中国国家图书馆政府出版物国际交换在文献来源和范畴界定上摸索出了一条符合国情的模式,并证明了图书情报机构在政府出版物海外传播过程中具有权威性、系统性、开放性的优势。综合国际相关经验和我国实际国情,建议政府应设立政府出版物官方机构,出版物交换主体应重视订立交换协议,图书情报机构要积极探索数字环境下的政府出版品交换模式,政府出版物国际交换应恪守国家保密原则。

关键词：出版物交换政府出版物政府信息公开

Effect of mmPs/TIMPs on Atrial Structural Remodeling in A Chronic Canine Atrial Fibrillation Model

在线全文

学校读者我要写书评

暂无评论

中国心脏起搏与心电生理杂志 2004年第Z1期18卷 192-193页

作者： Yang guirong zhang wei li li Wang sujia Zhu hui zhang yun Department of cardiology Qilu hospital of Shandong University Jinan Shandong 250012China

　　Objective Atrial fibrillation (AF) is commonly associatedwith atrial dilation and fibrosis, but the mechanism underlying these abnormalities remains unclear. The purpose of this study is to investigate the effect of matrix metalloproteinase-9 (mmP-9)and tissue in hibitor metalloproteinase -1 (TIMP-1) on extracellular matrix of atrium.……

关键词： extracellular matrix Atrial fibrillation