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New Chromone Glycosides from Hypericum Japonicum

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Chinese Chemical Letters 1997年第1期8卷 41-42页

作者： Wu, QL Liao, yh Wang, SP Wang, LW Feng, YX Yang, JS Xiao, PG Hong, SL BEIJING UNION MED COLL BEIJING 100094PEOPLES R CHINA BEIJING INST MICROCHEM BEIJING 100091PEOPLES R CHINA CHINESE ACAD MED SCI INST MED PLANT DEVBEIJING 100094PEOPLES R CHINA

From the aerial part of Hypericum japonicum Thunb. ex Murray, two new chromone glycosides, 5, 7-Dihydroxy-2-(1-methylpropyl) chromone-8-beta-D-glucoside and 5, 7-Dihydroxy-2-isopropylchromone-8-beta-D-glucoside, were ... 详细信息

关键词： ppm New Chromone Glycosides from Hypericum Japonicum

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中文联机中的问题与对策

国外情报科学 1991年第3期9卷 52-58页

作者： Shi,yh 赵更申

DIMENSION REDUCTION,FEATURE EXTRACTION AND INTERPRETATIO…

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电脑开发与应用 1996年第1期9卷 2-11,14页

作者： Pao.,yh 朱彦良

该文主要内容是模式识别和人工智能研究机械长期感兴趣的主题之一“特征提取”。它有助于分类任务和其他任务的完成，笔者认为：神经网络的内部显示法不会产生特征值，但却为诸如存储，妆类，显示及联想提供了大量信息和算法，文内用基... 详细信息

该文主要内容是模式识别和人工智能研究机械长期感兴趣的主题之一“特征提取”。它有助于分类任务和其他任务的完成，笔者认为：神经网络的内部显示法不会产生特征值，但却为诸如存储，妆类，显示及联想提供了大量信息和算法，文内用基准数据，现场传感器数据及由半导体晶格结构参数组成的三组数据来具体阐明了上述内容。

关键词：特征提取自动联想模式识别人工智能

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矢量GIS的坡线搜索

国外测绘 1994年第4期 40-47页

作者： Chou,yh 周秋生

过去由于栅格数据结构占有统治地位，从地形数据中搜索坡线的方法均是基于栅格的。近来，地理信息系统的发展很快，为更加有效地处理矢量结构的数据，必须建立基于矢量的处理方法。本文提出了一种用于分析地形坡线搜索的矢量方法。在等... 详细信息

过去由于栅格数据结构占有统治地位，从地形数据中搜索坡线的方法均是基于栅格的。近来，地理信息系统的发展很快，为更加有效地处理矢量结构的数据，必须建立基于矢量的处理方法。本文提出了一种用于分析地形坡线搜索的矢量方法。在等高线数字化后形成了两个关联地形数据文件，等高线属性表和点位坐标文件。任意给定地面上的一个点作为地势走向的起点，可由柯西－什瓦茨定理识别出最速下降的连续线段。

关键词：地理信息系统矢量坡线搜索

Increasing dietary fiber intake in terms of kiwifruit improves constipation in Chinese patients

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World Journal of Gastroenterology 2007年第35期13卷 4771-4775页

作者： Annie On On Chan Gigi Leung Teresa Tong Nina yh Wong Department of Medicine The University of Hong KongHong KongChina

AIM： To investigate if increased dietary fiber, in terms of kiwifruit, is effective in Chinese constipated patients. METHODS： 33 constipated patients and 20 healthy volunteers were recruited for a 4-wk treatment of kiwi fruit twice daily. Response during wk 1-4 was defined as an increase in complete spontaneous bowl, motion （CSBM）≥ 1/wk. Secondary efficacy included response during wk 1-4, individual symptoms and scores of bowel habits and constipation. Responses were compared with the baseline run-in period. Colonic transit time and anorectal manometry were performed before and after treatment. RESULTS： Responder rate was 54.5% in the constipated group. The mean CSBM increased after treatment （2.2±2.6 vs 4.4± 4.6, P = 0.013）. There was also improvement in the scores for bothersomeness of constipation （P = 0.02）, and satisfaction of bowel habit （P = 0.001）, and decreased in days of laxative used （P = 0.003）. There was also improvement in transit time （P = 0.003） and rectal sensation （P 〈 0.05）. However, there was no change in the bowel symptoms or anorectal physiology in the healthy subjects. CONCLUSION： Increasing dietary fiber intake is effective in relieving chronic constipation in Chinese population.

关键词： Constipation Dietary fiber Kiwifruit Chinese

The rheological behavior of carbon black filled natural rubber

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The rheological behavior of carbon black filled natural rubb...

Effect of pulley integrity on excursions and work of flexion in healing flexor tendons

中国化学会第12届复杂流体流变学学术研讨会

作者： Zhongjia Xu yh Song Qiang Zheng MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University

The research on the mechanisms of reinforcement and nonlinear viscoelastic responses is an important foundation for China’s rubber industry to move towards high-end and fine ***,the reinforcement mechanism has been in great dispute *** researchers tend to pay more attention to influence of filler network and interface effect on viscoelastic behavior of filled vulcanizates,the contribution of the rubber phase especially its filler loading-interfered viscoelasticity to the reinforcement and nonlinearity is usually *** the same time,the relationship between the matrix relaxation and the rheological behavior of the vulcanizates is still lack of a systematic *** herein prepare a series of carbon black filled natural rubber（CB/NR） vulcanizates with varying CB concentrations and crosslinking densities to investigate the *** results show that the vulcanizates have good modulus recovery properties while increasing CB concentration and crosslinking density tend to shorten the strain amplitude of the linear viscoelasticity ***,the CB concentration and crosslinking density have a synergistic effect on rubber reinforcement.

关键词： carbon black filled nature rubber vulcanizates nonlinear viscoelasticity

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南通大学学报(医学版) 2003年第1期 116-117页

作者： Wang yh Gu YT Chen F

We investigated the effect of incision of a single critical pulley on excursions and work of flexion in healing flexor ***-two long toes from 21 white leghorn chickens were used as the experimental *** excursions of the flexor digitorum profundus tendons and work of flexion of the long toes were studied 8 weeks after tendon repair to determine the functions of the healed tendons in intact,incised, or enlarged A2 *** additional chickens (22 long toes) were used to obtain tendon excursion measurements in normal chicken *** 8 weeks,gliding excursions were statistically smaller in the intact pulley group than in the incised or enlarged pulley groups;the excursions were 73%+/-4% for the intact pulley group,88%+/-9% for the incised pulley group,and 91%+/-8% for the enlarged sheath group compared with the normal *** of flexion of the toes in the intact pulley group was statistically greater than that in the incised or enlarged pulley *** efficiency of the flexor tendons was not statistically different among the toes receiving different treatments in the *** results of this study demonstrate that release of a single pulley after repair of the tendons in this area improved gliding excursions of the tendons and reduced resistance to motion of the repaired tendons,and provide support for partial A2 pulley incision after repair of the tendons in the area of the pulley.(J Hand Surg 2001;26A:347-353,Copyright(C) 2001 by the American Society for Surgery of the Hand).

关键词： tendon sheath repair biomechanics hand

Energy dissipation in the Mullins effect of NBR vulcanizate

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Energy dissipation in the Mullins effect of NBR vulcanizate

Comparative study of oxidative stress induced by sand flower and schistose nanosized layered double hydroxides in N2a cells

中国化学会第12届复杂流体流变学学术研讨会

作者： Zhiyun Li yh Song Qiang Zheng Department of Polymer Science and Engineering University of Zhejiang

The Mullins effect of filled vulcanizates has attracted wide attention for its use to reflect the mechanical property during cyclic ***,the mechanisms of this effect are still *** this work,we divide the dissipation energy generated during constant-velocity cyclic deformations of filled NBR vulcanizates into a reversible and an irreversible loss part and quantitatively analyze the change of dissipation energy and its recovery with respect to crosslinking degree of the rubber phase and content of carbon *** results show that（1） the reversible energy loss can be superposed well onto a master curve determined by the microscopic strain of the rubber phase,suggesting a cause involving in the friction of free chains dangling from the rubber network;（2） the irreversible part is related to both the microscopic strain of the rubber phase and the content of carbon black,revealing a secondary origination from the filler and interface;（3） the energy dissipation in the first stretch can basically recover after a long time conditioning of the stretched vulcanizates,revealing that the energy dissipation is essentially related to the viscoelastic deformation of the rubber phase in the vulcanizates.

关键词： Mullins effect Energy dissipation

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Frontiers in Biology 2015年第3期10卷 279-286页

作者： yh Lu Biao Yan Xudong Liu Yuchao Zhang Shibi Zeng Hao Hu Rong Xiang Yu Xu Ying Yu Xu Yang Hubei Key Laboratory of Genetic Regulation and Integrative Biology College of Life Science Central China Normal University Wuhan 430079 China Institute of Nanoscience and Nanoteehnology Central China Normal University Wuhan 430079 China Department of Otolaryngology Head & Neck Surgery Renmin Hospital of Wuhan University Wuhan 430060 China

Magnesium-aluminum layered double hydroxide （Mg/ALLDH） nanoparticles have strong potential application as drug delivery systems because of their low toxicity and suitable biocompatibility. However, few studies have described the morphological effects of these hydroxides on nerve cells. The present study compares the oxidative stress induced by different concentrations （i.e., 0, 50, 100, 200, 400, and 800 μg/mL） of sand flower and flake nano-Mg/ AI-LDHs in mouse neuroblastoma cells （N2a） when these cells were exposed for 24 and 48 h. Cell viability was detected by MTT assay, and production of reactive oxygen species （ROS）, glutathione （GSH）, and malondialdehyde （MDA） were monitored to evaluate oxidative damage. Results suggested that sand flower nano-LDHs, at the appropriate concentrations （less than 200 μg/mL）, especially those of about 100-200 nm in size, induce no harmful effects on N2a cells.

关键词： magnesium-aluminum layered double hydroxide mouse neuroblastoma cell oxidative stress reactive oxygenspecies