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小范围内二阶线性微分方程解的局部渐近形态

Journal of Mathematical Research and Exposition 1993年第3期13卷 337-350页

作者： Gingo.,H yu,,lh

An association study of HFE gene mutation with idiopathic male infertility in Chinese Han population

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An association study of HFE gene mutation with idiopathic ma...

三维超声心动图测量左室心肌质量与心脏终点结局事件的相关性

中华医学会第六次全国生殖医学学术会议

作者： yu XY Wang BB Xin ZC Liu T Ma K Jiang J Fang X yu lh Peng YF Ma X Institute of Reproductive Medicine Yijishan HospitalWannan Medical College National Research Institute for Family Planning Peking Union Medical College Andrology Center Peking University First Hospital World Health Organization Collaborating Centre for Research in Human Reproduction

Hemochromatosis(HFE) mutations influence the iron status of the general population in Northern Europe,and excess iron is related with impairment of *** aim of this study is to investigate the association between three...

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中国组织工程研究与临床康复 2007年第48期11卷 9718-9721页

作者：喻丽华蔡伟赵玉娟李学文武警医学院附属医院心内科天津市300162

目的:为评价三维超声心动图在心血管疾病中的应用前景,验证左室心肌质量对心血管事件和死亡发生的预测价值,应用三维超声心动图检测左室心肌质量,探讨左室心肌质量与心血管病患者远期预后的关系。方法:①超声测定:选择2003-10/2007-04... 详细信息

目的:为评价三维超声心动图在心血管疾病中的应用前景,验证左室心肌质量对心血管事件和死亡发生的预测价值,应用三维超声心动图检测左室心肌质量,探讨左室心肌质量与心血管病患者远期预后的关系。方法:①超声测定:选择2003-10/2007-04武警医学院附属医院CCU及普通病房住院的64例患者接受左室心肌质量指数、静息左室射血分数测定和NYHA心脏功能分级的评估,仪器采用彩色多普勒超声诊断仪,型号为GE vivid-7。②分组及随访:根据左室肥厚标准和各参数平均数分为2组,左室心肌质量指数男性0.05);左室肥厚的Ⅱ组死亡例数多于Ⅰ组(P0.05);左室心肌质量指数高于平均数的Ⅱ组与Ⅰ组死亡相对危险比为2.56(95%CI),差异有统计学意义(P=0.020),但是静息左室射血分数和NYHA心脏功能分级之间死亡相对危险比没有统计学意义(P>0.05)。结论:①左室心肌质量与心血管病患者远期预后关系密切,可用于预测心源性死亡的发生情况。②三维超声心动图测定左室心肌质量及功能参数方便准确,可用于心功能定量评估。

关键词：彩色多普勒超声左室心肌质量左室心肌质量指数长期预后心源性死亡

STUDIES ON THE SYNTHESIS OF NOVEL ISONUCLEOSIDE FROM D-GLUCOSE

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Chinese Chemical Letters 1995年第8期6卷 655-656页

作者： yu, HW Ma, LT Zhang, lh Beijing Med Univ Sch Pharmaceut Sci Beijing 100083 Peoples R China

A novel isonucleoside, 2,5-anhydro-4-(adenine-9-yl-)-L-iditol was synthesized from D-glucose through 9 steps.

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Regulation of Arabidopsis Early Anther Development by Putative Cell-Cell Signaling Molecules and Transcriptional Regulators

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Journal of Integrative Plant Biology 2007年第1期49卷 60-68页

作者： yu-Jin Sun Carey lh Hord Chang-Bin Chen Hong Ma Department of Biology and the Huck Institutes of the Life Sciences Pennsylvania State University University Park PA 16802 USA The Integrative Bioscience Graduate Program Pennsylvania State University University Park PA 16802 USA

Anther development in flowering plants involves the formation of several cell types, including the tapetal and pollen mother cells. The use of genetic and molecular tools has led to the identification and characterization of genes that are critical for normal cell division and differentiation in Arabidopsis early anther development. We review here several recent studies on these genes, including the demonstration that the putative receptor protein kinases BAM1 and BAM2 together play essential roles in the control of early cell division and differentiation. In addition, we discuss the hypothesis that BAM1/2 may form a positive-negative feedback regulatory loop with a previously identified key regulator, SPOROCYTELESS （also called NOZZLE）, to control the balance between sporogenous and somatic cell types in the anther. Furthermore, we summarize the isolation and functional analysis of the DYSFUNCTIONAL TAPETUM1 （DYT1） gene in promoting proper tapetal cell differentiation. Our finding that DYT1 encodes a putative transcription factor of the bHlh family, as well as relevant expression analyses, strongly supports a model that DYT1 serves as a critical link between upstream factors and downstream target genes that are critical for normal tapetum development and function. These studies, together with other recently published works, indicate that cell-cell communication and transcriptional control are key processes essential for cell fate specification in anther development.

关键词： anther development Arabidopsis signaling tapetum transcription factor

Method for Detecting Industrial Defects in Intelligent Manufacturing Using Deep Learning

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Computers, Materials & Continua 2024年第1期78卷 1329-1343页

作者： Bowen yu Chunli Xie College of Mechanical and Electrical Engineering Northeast Forestry UniversityHarbin150040China

With the advent of Industry 4.0,marked by a surge in intelligent manufacturing,advanced sensors embedded in smart factories now enable extensive data collection on equipment *** analysis of such data is pivotal for ensuring production safety,a critical factor in monitoring the health status of manufacturing *** defect detection techniques,typically limited to specific scenarios,often require manual feature extraction,leading to inefficiencies and limited versatility in the overall *** research presents an intelligent defect detection methodology that leverages deep learning techniques to automate feature extraction and defect localization *** proposed approach encompasses a suite of components:the high-level feature learning block(HLFLB),the multi-scale feature learning block(MSFLB),and a dynamic adaptive fusion block(DAFB),working in tandem to extract meticulously and synergistically aggregate defect-related characteristics across various scales and hierarchical *** have conducted validation of the proposed method using datasets derived from gearbox and bearing *** empirical outcomes underscore the superior defect detection capability of our *** demonstrates consistently high performance across diverse datasets and possesses the accuracy required to categorize defects,taking into account their specific locations and the extent of damage,proving the method’s effectiveness and reliability in identifying defects in industrial components.

关键词： Industrial defect detection deep learning intelligent manufacturing

Quantization of a Class of Super W-Agebras

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Algebra Colloquium 2022年第4期29卷 633-642页

作者： yu Zhang Xiaomin Tang School of Mathematical Science Heilongjiang University Harbin 150080China

We study a class of super W-algebras whose even part is the Virasoro type Lie algebra W(2,2).We quantize the Lie superbialgebra of the super W-algebra by the Drinfeld twist quantization technique and obtain a class of... 详细信息

关键词： quantization super W-algebra quantum group Lie superbialgebra

An Experimental Study on Dynamics Features of Three Side-by-Side Flexible Risers Undergoing Vortex-Induced Vibrations in A Uniform Flow

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China Ocean Engineering 2020年第4期34卷 500-512页

作者： LIU yu LI Peng WANG yu LIU Li-hua WANG Fei GUO Hai-yan FU Qiang College of Architecture and Civil Engineering Shandong University of Science and TechnologyQingdao 266590China Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation Qingdao 266590China College of engineering Ocean University of ChinaQingdao 266100China Yantai China International Marine Containers Raffles Offshore Ltd Yantai 264000China

A vortex-induced vibration(VIV)experiment on three side-by-side risers subjected to a uniform flow was carried out in a combined wave-current *** dynamic features of interference effect on three side-by-side risers were investigated by varying fluid velocity and inter-riser *** distributions of dimensionless displacement,dominant frequency,and displacement trajectory of the model risers were measured using mode decomposition and wavelet transform *** coupled interference of inter-riser fluid to adjacent risers at different spacings was disclosed by introducing the"interference ratio"*** results show that at spacings smaller than 6.0 D,the three model risers display appreciable deviations in their displacement responses in cross-flow or in-line direction,attributable to the strong proximity disturbance and wake interference between the *** the spacing is increased to 8.0 D,wake interference still makes great difference to the dynamic response of the risers in both *** reduced velocity increases,the three risers show higher agreement with an isolated riser in overall dominant vibration frequency in CF direction than that in IL direction at all spacings and the side risers,although symmetrically placed,do not vibrate symmetrically,as a result of the steady deflection of clearance flow within the riser *** effect results in a remarkable unsteady mode competition within the risers;quantitation of the interference levels for the three risers at different spacings with interference ratio revealed that under low flow velocities and large spacing ratios,clearance flow constitutes a non-neglectable interferer for three side-by-side risers.

关键词： three-riser group VIV side-by-side arrangement interference effect clearance flow mode competition

Identification of An Allosteric Pocket and Residues of GAB for Selective Glutaminase-2Inhibition

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Identification of An Allosteric Pocket and Residues of GAB f...