检索结果-南通市图书馆

STREAMLINE-EQUIVORTICITY-LINE ITERATION METHOD FOR CALCULATING STEADY FLOW OF NONUNIFORM STREAM PAST A CIRCULAR CYLINDER

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 1991年第2期3卷 1-4页

作者： Zhai, da-xi Zhao, Han-zhong Huazhong Univ of Science and Technology Wuhan China

In this paper, an iteration method is presented to calculate the steady noseparation flow past a circular cylinder with brokenline-shaped velocity profile. At each iteration step, the streamlines of the last step are considered as equivorticity lines to determine the new flow field. The iterative process is stopped when certain convergence criterion is reached. Several examples are given which show the effectiveness of the method.

关键词： Fluid Mechanics Hydrodynamics Mathematical Techniques Piecewise Linear Techniques Stream Flow

The optic nerve head perfusion and its correlation with the macular blood perfusion in unilateral idiopathic macular hole： an optical coherence tomography angiography study

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2018年第3期11卷 438-444页

作者： xin-xin Liu Yu-Fei Teng Meng Gao xi-da Liang Yan-Ping Yu Wu Liu Beijing Tongren Eye Center Beijing Tongren Hospital Capital Medical University Beijing Ophthalmology & Visual Sciences Key Laboratory Beijing 100730 China Beijing Institute of Ophthalmology Beijing Tongren Eye Center Beijing Tongren Hospital Capital Medical UniversityBeijing Ophthalmology & Visual Sciences Key Laboratory Beijing 100005 China

AIM： To compare the optic nerve head （ONH） perfusion in both eyes of unilateral idiopathic macular hole （IMH） with normal control group by using optical coherence tomography angiography （OCTA） and investigate its correlationship with the macular blood perfusion. METHODS： We performed a prospective and cross- sectional study that included 19 patients with full-thickness unilateral IMH and 24 age- and sex-matched controls. All participants received OCTA test. The ONH perfusion was evaluated by the regions of peripapillary and whole en face （the sum of peripapillary and optic disc）. The potential correlationship between ONH and parafovea were implied. All the data were performed using the nonparametric test. RESULTS： The mean values of ONH presented that normal control 〉IMH 〉unaffected eyes. A statistical variation was found between three groups in the region of temporal （P=-0.007）, Vessel density notablely decreased on the layers of superficial, deep and choroid of parafovea region in IMH group. The correlative coefficients showed that respectively whole en face and deep retina： r=0.528, peripapillary and deep retina： r=0.525, whole en face and choriocapillaries： r=0.569, peripapillary and choriocapillaries： t=0.504. CONCLUSION： Our study demonstrate a reduced ONH vessel density in both eyes of IMH patients and the vessel density of ONH in IMH eyes are positively correlated with both the retina capillary and choriocapillary in parafoveal. The reduction of vessel densities may indicate the hypoperfusion in IMH eyes,

关键词： idiopathic macular hole optic nerve headperfusion optical coherence tomography angiography

An Improved H∞ Filter Design for Nonlinear System with Time-delay via T-S Fuzzy Models

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

自动化学报 2010年第10期36卷 1454-1459页

作者： HUANG Sheng-Juan ZHANG da-Qing HE xi-Qin ZHANG Ning-Ning Science of School University of Science and Technology of Liaoning Anshan 114051 P. R. China

This paper is concerned with the filter design for nonlinear systems with time-varying delay via Takagi-Sugeno fuzzy model approach. Some sufficient conditions of the existence of fuzzy H ∞ filter are established through constructing an improved Lyapunov functional candidate, which could overcome the conservatism of the existing ones. The main technique used is the free weighting matrix method combined with a matrix decoupling approach. An illustrative example is given to show the effectiveness of the method

关键词：非线性系统自动化系统研究模糊性

The Effect of Parity on Conjugated Linoleic Acid(CLA) Content in Milk Fat and CLA-Desaturase Index from Holstein dairy Cows

在线全文

学校读者我要写书评

暂无评论

畜牧兽医学报 2009年第S1期40卷 28-33页

作者： HOU Jun-cai LIU Fei LIU Yan-ping HUO Gui-cheng REN da-xi TI Wei-gang Key Laboratory of dairy Science Ministry of EducationNortheast Agricultural University College of Food Northeast Agricultural University

The performance of lactating dairy cows and composition of the fatty acids in milk fat were measured to investigate the effect of parity on conjugated linoleic acid(CLA)in milk fat and△~9-desaturase indices from Holstein dairy *** samples of two hundred and thirty-five lactating Holstein dairy cows in north China were *** order to avoid possible confounding effects of diet and season,Holstein cows were fed a single diet and milk was sampled on the same *** average content of cis-9,trans-11 CLA was 5.14 mg/g fatty acids in milk fat,varying between 1.5 and 10.5 mg/g fatty *** average content of cis-9,trans-11 CLA of primiparous cattle was 5.19 mg/g fatty acids in milk fat,while it was 5.11 mg/g fatty acids in multiparous animals,with no significant difference between them(P>0.05).There was a significant(P0.05)in the△~9-desaturase index of cis-9 C18:l and cis-9,trans-11 CLA.

关键词： Parity conjugated linoleic acid(CLA) △9-desaturase indices

Microstructural damage pattern of vascular cognitive impairment: a comparison between moyamoya disease and cerebrovascular atherosclerotic disease

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2019年第5期14卷 858-867页

作者： Jia-Bin Su Si-da xi Shu-Yi Zhou xin Zhang Shen-Hong Jiang Bin Xu Liang Chen Yu Lei Chao Gao Yu-xiang Gu Department of Neurosurgery Huashan Hospital Fudan University Shanghai Medical College Fudan University Department of Radiology Huashan Hospital Fudan University

Moyamoya disease and cerebrovascular atherosclerotic disease are both chronic ischemic diseases with similar presentations of vascular cognitive impairment. The aim of the present study was to investigate the patterns of microstructural damage associated with vascular cognitive impairment in the two diseases. The study recruited 34 patients with moyamoya disease(age 43.9 ± 9.2 years; 20 men and 14 women, 27 patients with cerebrovascular atherosclerotic disease(age: 44.6 ± 7.6 years; 17 men and 10 women), and 31 normal controls(age 43.6 ± 7.3 years; 18 men and 13 women) from Huashan Hospital of Fudan University in China. Cognitive function was assessed using the Mini-Mental State Examination, long-term delayed recall of Auditory Verbal Learning Test, Trail Making Test Part B, and the Symbol Digit Modalities Test. Single-photon emission-computed tomography was used to examine cerebral perfusion. Voxel-based morphometry and tract-based spatial statistics were performed to identify regions of gray matter atrophy and white matter deterioration in patients and normal controls. The results demonstrated that the severity of cognitive impairment was similar between the two diseases in all tested domains. Patients with moyamoya disease and those with cerebrovascular atherosclerotic disease suffered from disturbed supratentorial hemodynamics. Gray matter atrophy in bilateral middle cingulate cortex and parts of the frontal gyrus was prominent in both diseases, but in general, was more severe and more diffuse in those with moyamoya disease. White matter deterioration was significant for both diseases in the genu and body of corpus callosum, in the anterior and superior corona radiation, and in the posterior thalamic radiation, but in moyamoya disease, it was more diffuse and more severe. Vascular cognitive impairment was associated with regional microstructural damage, with a potential link between, gray and white matter damage. Overall, these results provide insight into the p

关键词： nerve regeneration vascular cognitive impairment moyamoya disease cerebrovascular atherosclerotic disease magnetic resonance imaging diffusion tensor imaging gray matter volume tract-based spatial statistics single-photon emission computed tomography neural regeneration

中国共产党初创时期的组织结构特点及其制度化进程

在线全文

学校读者我要写书评

暂无评论

湖南师范大学社会科学学报 2005年第2期34卷 50-55页

作者：黄大熹湖南大学政治与公共管理学院湖南长沙410082

中国共产党组织的创生带有两个明显的表象特征:第一,它不是从议会内部演生而来,而是以反政府的面目出现,属于传统体制之外的"外源性"政党组织。这一特点决定了党的组织结构必须建立在高度一体化的基础之上,并辅之以刚性组织纪律,以便发... 详细信息

中国共产党组织的创生带有两个明显的表象特征:第一,它不是从议会内部演生而来,而是以反政府的面目出现,属于传统体制之外的"外源性"政党组织。这一特点决定了党的组织结构必须建立在高度一体化的基础之上,并辅之以刚性组织纪律,以便发挥其作用;第二,它的建立和发展借助了两种外在支持力量:一为共产国际的原则指导,二为中国国民党的组织平台。这两种力量对中国共产党组织发展所施加的影响,体现在两个方面:其积极的一面就是缩短了组织的创生过程,并加快了发展进度;其消极的一面就是弱化了政党领袖和组织的权威性与自主性,从而导致政党内部党员个体组织效忠意识一定程度的削弱。除此之外,这一时期的中国共产党依照民主集中制原则构建其组织结构,使其制度化的进程不断加快。

关键词：中国共产党外在支持力量组织结构制度化

在线全文

学校读者我要写书评

暂无评论

应重视血液透析远期并发症的防治

中华肾脏病杂志 2008年第4期24卷 223-226页

作者：季大玺南京军区南京总医院肾脏病研究所 210002

维持性血液透析（MHD）是一种不完全性肾功能替代疗法，不能完全纠正尿毒症的代谢紊乱和清除体内蓄积的毒性物质。因此，在透析治疗过程中经常遇到一些常规透析所不能解决的问题，而且随着存活时间的延长还会产生新的并发症。正确诊治... 详细信息

维持性血液透析（MHD）是一种不完全性肾功能替代疗法，不能完全纠正尿毒症的代谢紊乱和清除体内蓄积的毒性物质。因此，在透析治疗过程中经常遇到一些常规透析所不能解决的问题，而且随着存活时间的延长还会产生新的并发症。正确诊治和处理这些并发症，对降低我国透析患者的并发症发病率和病死率，改善生活质量和延长寿命均具有重要意义。

关键词：维持性血液透析远期并发症肾功能替代疗法防治毒性物质体内蓄积代谢紊乱常规透析

在线全文

学校读者我要写书评

暂无评论

血液透析相关高血压及低血压的治疗对策

中国实用内科杂志 2007年第22期27卷 1749-1752页

作者：季大玺南京军区南京总医院解放军肾脏病研究所江苏南京210002

1血液透析相关高血压血液透析相关高血压是指在血液透析充分的状态下,患者透析前平均动脉压(MAP)>106mmHg(血压>140/90mmHg,1mmHg=0.133kPa)。据HEMO研究报道,维持性血液透析(MHD)患者高血压的发生率大于70%。服用降压药物占75%,其中72... 详细信息

1血液透析相关高血压血液透析相关高血压是指在血液透析充分的状态下,患者透析前平均动脉压(MAP)>106mmHg(血压>140/90mmHg,1mmHg=0.133kPa)。据HEMO研究报道,维持性血液透析(MHD)患者高血压的发生率大于70%。服用降压药物占75%,其中72%以上的患者服用降压药后血压未能降至正常。部分患者经合理联合应用3种或3种以上降压药物,血压仍不能控制在正常水平,临床上称之为“难治性高血压”(5%)。[第一段]

关键词：维持性血液透析高血压低血压

Effect of culturing conditions on the expression of key enzymes in the proteolytic system of Lactobacillus bulgaricus

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2015年第4期16卷 317-326页

作者： Jun-cai HOU Fei LIU da-xi REN Wei-wei HAN Yue-ou DU Key Laboratory of dairy Science Ministry of Education Northeast Agricultural University College of Food Science Northeast Agricultural University College of Animal Sciences Zhejiang University

The proteolytic system of Lactobacillus bulgaricus breaks down milk proteins into peptides and amino acids, which are essential for the growth of the bacteria. The aim of this study was to determine the expressions of seven key genes in the proteolytic system under different culturing conditions （different phases, initial pH values, temperatures, and nitrogen sources） using real-time polymerase chain reaction （RT-PCR）. The transcriptions of the seven genes were reduced by 30-fold on average in the stationary phase compared with the exponential growth phase The transcriptions of the seven genes were reduced by 62.5-, 15.0-, and 59.0-fold in the strains KLDS 08006, KLDS 08007, and KLDS 08012, respectively, indicating that the expressions of the seven genes were significantly different among strains. In addition, the expressions of the seven genes were repressed in the MRS medium containing casein peptone. The effect of peptone supply on PepX transcription was the weakest compared with the other six genes, and the impact on OppD transcription was the strongest. Moreover, the expressions of the seven genes were significantly different among different strains （P〈0.05）. All these results indicated that the culturing conditions affected the expression of the proteolytic system genes in Lactobacillus bulgaricus at the transcription level.

关键词： Gene expression Proteolytic system Lactobacillus bulgaricus Proteinase