检索结果-南通市图书馆

考虑剪切和轴向效应的半刚性连接Timoshenko梁柱的大挠度和后屈曲性态

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

钢结构(中英文) 2008年第1期 86-87页

作者： J.Dario Aristizabal-ochoa

研究Timoshenko梁-柱的非线性大挠度-小应变分析和后屈曲行为。这种梁具有半刚性连接的对称横截面,其连接经受保守和非保守端部荷载(力和弯矩)作用,分析中将组合剪切作用、轴向和弯曲变形、轴向偏心力、水平支撑和移位等都简化为单一的... 详细信息

研究Timoshenko梁-柱的非线性大挠度-小应变分析和后屈曲行为。这种梁具有半刚性连接的对称横截面,其连接经受保守和非保守端部荷载(力和弯矩)作用,分析中将组合剪切作用、轴向和弯曲变形、轴向偏心力、水平支撑和移位等都简化为单一的荷载作用。基于改进的剪力公式,推导出一套包括剪切变形和轴向外力导致的剪力等效应的函数集合。同时,还推出了因梁柱在端部力和弯矩作用下弯曲而产生的轴向位移δb的表达方式。尽管只是近似推算,但所提出的方法和相应的非线性方程,却可以用于带刚性、半刚性连接和铰接的Timoshenko梁-柱的拉压稳定性和非线性大挠度-小应变弹性分析。分析研究表明,剪切变形增加了纵横向的挠度,减小了梁柱由于轴向压力而产生的屈曲。在具有相对低效剪力区域或低抗剪刚度的梁柱分析中必须考虑剪切变形的作用。剪切效应在板式橡胶支座的拉压稳定性和动力特性方面的影响上同样非常重要。采用4个范例说明该方法和公式的有效性。

关键词：梁梁-柱大挠度 P-Δ分析非线性分析半刚性连接稳定性结构分析后屈曲性态 Timoshenko梁

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

新发现的激动

医学分子生物学杂志 1982年第1期 38-41页

作者： ochoa S 杨严礼

我于1955年在伦敦国际生化协会临时委员会会议上第一次迂见马塞尔·弗洛金(Macel Florkin),他是该协会的主席并召集起草了新协会的章程,接着任1955年到1961年国际生化协会(IUB)第一任主席。1961年我继任弗洛金(Florkin)国际生化协会主... 详细信息

我于1955年在伦敦国际生化协会临时委员会会议上第一次迂见马塞尔·弗洛金(Macel Florkin),他是该协会的主席并召集起草了新协会的章程,接着任1955年到1961年国际生化协会(IUB)第一任主席。1961年我继任弗洛金(Florkin)国际生化协会主席的职务。由于他的帮助,我任此职一直到

关键词：异柠檬酸脱氢酶洛金生化 NADPH mRNA 三氯醋酸柠檬酸循环磷酸化酶糖基转移酶多聚体 ADP 核昔酸密码子实验结果丙酮酸蛋白质合成系统苹果酸酶脱氢酶氨基酸氨基羧酸次黄

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

杀戮还是艺术?

中国慈善家 2020年第4期 78-91页

作者：吴可言 Daniel ochoa de Olza(摄影) 不详

华丽的斗牛士服装、血腥的场面、奄奄一息的公牛……这项涎生于18世纪中叶的西班牙传统表演如今仍令许多观众趋之若鹜;同时它也饱受争议,以动物杀戮为乐的斗牛表演正在减少。西班牙摄影师丹尼尔·奥乔亚花了7年时间、观看上百场斗牛表... 详细信息

华丽的斗牛士服装、血腥的场面、奄奄一息的公牛……这项涎生于18世纪中叶的西班牙传统表演如今仍令许多观众趋之若鹜;同时它也饱受争议,以动物杀戮为乐的斗牛表演正在减少。西班牙摄影师丹尼尔·奥乔亚花了7年时间、观看上百场斗牛表演后拍摄出这组照片,“爱它的人为之疯狂,恨它的人嗤之以鼻。”奥乔亚告诉《中国慈善家》。

关键词：斗牛奥乔亚杀戮慈善家丹尼尔摄影师西班牙

Role of laryngeal mask airway in laparoscopic cholecystectomy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2015年第11期7卷 319-325页

作者： José M Belena Ernesto Josué ochoa Mónica Núnez Carlos Gilsanz Alfonso Vidal Department of Anesthesiology and Critical Care Sureste University Hospital Department of Anesthesiology and Critical Care Hospital Sur Department of Anesthesiology and Critical Care Ramón y Cajal University Hospital Department of General and Gastrointestinal Surgery Sureste University Hospital

Laparoscopic cholecystectomy is one of the most commonly performed surgical procedures and the laryngeal mask airway(LMA) is the most common supraglottic airway device used by the anesthesiologists to manage airway during general anesthesia. Use of LMA has some advantages when compared to endotracheal intubation, such as quick and ease of placement, a lesser requirement for neuromuscular blockade and a lower incidence of postoperative morbididy. However, the use of the LMA in laparoscopy is controversial, based on a concern about increased risk of regurgitation and pulmonary aspiration. The ability of these devices to provide optimal ventilation during laparoscopic procedures has been also questioned. The most important parameter to secure an adequate ventilation and oxygenation for the LMA under pneumoperitoneum condition is its seal pressure of airway. A good sealing pressure, not only state correct patient ventilation, but it reduces the potential risk of aspiration due to the better seal of airway. In addition, the LMAs incorporating a gastric access, permitting a safe anesthesia based on these commented points. We did a literature search to clarify if the use of LMA in preference to intubation provides inadequate ventilation or increase the risk of aspiration in patients undergoing laparoscopic cholecystectomy. We found evidence stating that LMA with drain channel achieves adequate ventilation for these procedures. Limited evidence was found to consider these devices completely safe against aspiration. However, we observed that the incidence of regurgitation and aspiration associated with the use of the LMA in laparoscopic surgery is very low.

关键词： Laryngeal mask airway Laryngeal mask airway Prosea

Comparison of Two Pour-On Formulations of Ivermectin against Gastrointestinal Worms, Fleas and Lice in Naturally Infected Stray Dogs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pharmacology & Pharmacy 2015年第3期6卷 177-184页

作者： Froylán Ibarra-Velarde Yolanda Vera-Montenegro Joaquín Ambía Medina Karla Sánchez-Peralta Pedro ochoa Galván Departamento de Parasitología Facultad de Medicina Veterinaria y Zootecnia Universidad Nacional Autónoma de México México D.F. México Laboratorio Salud Animal México D.F. México Departamento de Génetica Facultad de Medicina Veterinaria y Zootecnia Universidad Nacional Autónoma de México México D.F. México

The aim of the present study was to evaluate the efficacy of two commercial pour-on ivermectin formulations against intestinal parasites (IP), fleas and lice in naturally infested stray dogs. Eighteen crossbreed dogs with eggs of IP as well as adult fleas and lice were included in the trial. On day 0, the dogs were randomly divided into 3 groups of 6 animals each: a group receiving a single pour-on treatment with 0.5% ivermectin (500 mcg/kg), a group treated similarly with 0.2% iver-mectin (200 mg/kg), and a control group. Fecal and skin analyses were carried out on days 0, 7, 14, 21 and 28 to determine the reduction of eggs and the number of fleas and lice. Weight gain was also measured on day 28. On day 30, the dogs were humanely sacrificed in order to count adult IP. Efficacy was measured as the percentage of the reduction of eggs per gram fecal mass (EPGF), of adult IP, fleas and lice relative to the control group. For the eggs of IP, ivermectin at 0.5% showed an efficacy of 100% against ascarids and 79% against Ancylostoma caninum. ivermectin at 0.2% removed 90.2% of the ascarids and 50.4% of A. caninum. For adult IP, the efficacy of 0.5% iver-mectin against Toxocara canis and A. caninum was 100%, and for 0.2% ivermectin it was 62.4% and 76.4% for T. canis and A. caninum, respectively. Both compounds were 100% effective against lice and 96% and 71.1% efficacious against fleas, respectively. However, neither treatment was effective against Dypilidium caninum. Weight gain in treated dogs was statistically different from that of the controls (p < 0.05). We concluded that 0.5% pour-on ivermectin showed better efficacy than 0.2% pour-on ivermectin in the reduction of eggs and adult intestinal parasites and fleas;it was similarly efficacious against lice.

关键词： Ivermectin Intestinal Worms Fleas and Lice Stray Dogs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

古巴石灰工业的现状

国外建材科技 1999年第4期20卷 23-24页

作者： P.A.ochoa George 谈正雄武汉工业大学外语系 430070

古巴的石灰生产是西班牙殖民者在16～17世纪引入的。在初始阶段石灰仅用于建筑业,到后来,特别是随着制糖工业的日益发展,石灰开始应用于其它的一些领域。在最近40年中,由于一批大型水泥厂的建成和投产,石灰在建筑业中的用量大大减少。... 详细信息

古巴的石灰生产是西班牙殖民者在16～17世纪引入的。在初始阶段石灰仅用于建筑业,到后来,特别是随着制糖工业的日益发展,石灰开始应用于其它的一些领域。在最近40年中,由于一批大型水泥厂的建成和投产,石灰在建筑业中的用量大大减少。这一发展过程使古巴的制糖厂已成为石灰最大的制造商和用户,石灰也成为制糖工业中最重要的化学剂见表1。

关键词：石灰工业现状古巴企业管理石灰生产

Evaluation of the Physicochemical Behavior of Waste Water Treatment Polyelectrolytes with Metal Ions

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Protection 2013年第3期4卷 270-279页

作者： Eduardo A. López Maldonado Mercedes T. Oropeza Guzmán Georgina Pina-Luis Adrián ochoa-Terán Graduate and Research Center of the Technical Institute of Tijuana Tijuana México Graduate and Research Center of the Technical Institute of Tijuana Tijuana México Centre for Research and Technological Development in Electrochemistry Tijuana México

In this paper is describing the physicochemical behavior of polyelectrolytes (PEs) used in waste water treatment with mono-, di- and trivalent metal ions as K+, Mg2+, Zn2+, Fe3+, Sn2+, Cd2+, Pb2+, Cu2+, Ni2+, Al3+ and Cr3+. A coagulant polyelectrolyte Poly(vinyl sulfate) potassium salt (PVSK), and a commercial available Flocculant Trident 2756, were used as models for the study. The colloidal titration UV-Vis spectroscopy technique was successfully implemented in order to evaluate the complexation of PEs with Toluidine Blue O (OTB) and the ability of different metal ions to displace the OTB from the PE-OTB complex and form the PE-metal ion complex. From the experiments was concluded that PVSK has a high affinity for Al3+ and Mg2+ while the Flocculant has the highest affinity for Sn2+ followed by Zn2+and Mg2+. The absorbance profiles of polyelectrolyte-OTB complex (Absorbance vs. Metal/PE) were used to calculate association constants. On the other hand, the mass balance of OTB and its absorbance profiles were used to calculate the association constants of polyelectrolyte-metal ion complexes. Thus metal ions with the highest affinities have the highest association constant. Metal ions with the highest affinities present the highest values of association constant.

关键词： Polyelectrolytes Metal Ions Colloidal Titration UV-Vis Spectroscopy O-Toluidine WastewaterTreatment

Early muscle reinnervation by means of end-to-side neurorrhaphy in an experimental model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plastic and Aesthetic Research 2017年第2期4卷 18-23页

作者： AraceIi Pérez RafaeI Reynoso Rosa MRomero AngéIica GonzáIez Jorge ochoa DuIce HGutiérrez Damián PaIafox Department of Plastic Surgery General Hospital“Dr.Manuel Gea Gonzalez”Mexico City14080Mexico Department of Morphology of Cell and Tissue National Pediatric InstituteMexico City14080Mexico Department of Plastic Surgery Hospital AngelesMexico City14080Mexico Department of Health Sciences Technological University of MexicoMexico City14080Mexico.

Aim:The aim of the study was to provide early muscular reinnervation to avoid muscle atrophy and functional loss in an experimental ***:Fifty rats were divided into five *** group 0(control group)only nerve dissection was *** peroneal nerve section was performed in the remaining *** end-to-end neurorrhaphy(EEN)was made in group *** group 2,an end-to-side neurorrhaphy(ESN)was performed from the tibial nerve to the peroneal *** group 3,a direct EEN,plus an ESN,were used as a nerve graft as a bridge from the donor nerve(tibial);all nerve coaptations were performed through an epineural *** group 4,only a neurotomy was made without any type of ***:Neural diameters were similar in groups 0,1,and 3(38±1μm,31±6μm,32±3μm).Neural fibers in group 3 had an 18%increase in the number of axons(P<0.001)when compared to group *** 2(28±1μm)and group 4(19±3μm)had diminished diameters with a lower index of muscle *** in group 4 presented with'clawed'lower extremities and had difficulty with *** graft diameters was similar in groups 2 and 3(33±4μm,31±3μm),but axon density was significantly higher in group 3(53±6μm,39±8μm)(P<0.001).Axon density was 36%higher when the combination of EEN and ESN with a neural graft through an epineural window was ***:This study revealed that the combination of EEN and ESN repairs with the addition of a neural graft provides a lower index of muscle fiber destruction,and can be a reliable method for reconstruction in high neural injuries.

关键词： Nerve transfer neurorrhaphy muscle reinnervation nerve repair

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

ARL发布协作教学与学习工具专门文件

图书情报工作动态 2012年第9期 10-17页

作者： MarilynN.ochoa ThomasCaswell 宋菲(编译) 栾冠楠(校对)

1 引言协作式教学与学习工具包括一系列用于评价、创造以及呈现信息的硬件设施。本调查特别聚焦在提供给用户用于个人化的、用户发起的、协作式的教学与学习自服务环境的设备、装置或系统。这些工具中有许多不能为人轻易学习掌握，而... 详细信息

1 引言协作式教学与学习工具包括一系列用于评价、创造以及呈现信息的硬件设施。本调查特别聚焦在提供给用户用于个人化的、用户发起的、协作式的教学与学习自服务环境的设备、装置或系统。这些工具中有许多不能为人轻易学习掌握，而另外一些工具则更为直观，被广泛用于研究机构。它们可能存在于图书馆或机构（译注：这里的“机构”多指图书馆所隶属的大学）的其他地方。一些工具用于用户协作式教学与学习，而另外一部分工具则可能与个体化教学与学习场景相关。尽管许多机构都提供技术外借以供教育使用，有关此类项目的记载仍旧很少。本调查旨在呈现126个ARL成员大学中61个大学的63所图书馆所提供或即将提供的此类工具的概览。

关键词：学习工具协作教学 ARL 协作式教学研究机构文件个体化教学图书馆