检索结果-南通市图书馆

Aim:To search the peroxisome proliferator-activated receptor γ(PPARγ)agonistsfrom Swietenia mahagony extract(SmE)and observe the possible ameliorativeeffects of SmE on diabetic db/db ***:The PPARγagonistic activity ofSmE was screened by yeast-two hybrid *** blood glucose levels ofdiabetic db/db mice were measured using a blood glucose level monitor and thedata were statistically analyzed by NDST8.8W ***:By using theclinical drug rosiglitazone as a positive control,it was found that the PPARγagonistic activity of SmE at a concentration of 50μg/L was approximately half thatof 35.7μg/L(0.1μmol/L)of *** the dose of 1000 mg/kg,SmE remark-ably decreased the blood glucose concentration of db/db mice from(15.26±2.98)to(7.58±2.20)mmol/L,and reduced the blood glucose levels by 55.49% comparedwith the control group(P<0.01).Conclusion:SmE shows agonistic activity toPPARγ and can ameliorate the blood glucose levels of diabetic db/db *** be thus used as a potential agent for diabetes therapy.

关键词： Swietenia mahagony diabetes mellitus peroxisome proliferator-activated receptor γ yeast-two hybrid

来源：

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

The Packaging Technology of Optical Switch Arrays

The Packaging Technology of Optical Switch Arrays

引用

20th Congress of the International Commission for Optics

作者： Lina Zhao 1 Jingqiu Liang 1 * Wei dong 2 Anjie Ming 1 Weihua Lan 1 Xia Jin 1 Wangbin Zhu1 Weibiao Wang 1 Zichun Le 3 Weiyou Chen 2 Lijun Wang 1 1: state key laboratory of Applied Optics Changchun Institute of Optical Fine Mechanics and Physics Chinese Academy of Sciences Changchun 130031 People’s Republic of china * 2: National Integrated Optoelectronics key & Ally lab Jilin university Changchun 130021 People’s Republic of china 3: zhejiang university of Technology hangzhou 310014 People’s Republic of china

Optical switch is one of key supporting technologies in all-optical-network (AON). And electrostatic MOEMS (Micro-Optical-Electro-Mechanical Systems) switch plays a very important role in all the rese

关键词： Optical switch MOEMS Insertion loss Collimator Pedestal Packaging

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Optimal Precoding Ratios for Precoded （3,6） LDPC Codes

Optimal Precoding Ratios for Precoded （3,6） LDPC Codes

引用

2011 IEEE International Conference on Information Theory and Information Security(ICITIS 2011)

作者： Huijuan Zheng Xi’an Institute of Post and Telecommunications P. R. china.Sheng Tong state key lab. of ISN Xidian Unviersity P. R. china

Recently, the technique of precoding is in- troduced to LDPC codes by Divsalar et al., resulting in precoded LDPC codes. It is shown that precoding can improve not only the iterative decoding thresholds of regular LDPC codes but also their maximum-likelihood （ML） decoding thresholds. In this paper, we apply pre- coding only to the information bits and consider the optimal precoding ratios for precoded （3,6） LDPC codes under both iterative and ML decodings. For iterative decoding performance analysis, the tool of EXIT charts is employed, which shows that the optimal precoding ratio is 0.25, i.e., half of the information bits are to be precoded;whereas, for ML decoding analysis, the asymp- totic ensemble distance spectrum of precoded （3,6） LDPC codes is first derived. Then, using the derived asymptotic ensemble distance spectrum along with Divsalar’s simple bound, we show that the optimal ML decoding threshold is achieved at a precoding ratio of 0.5, i.e., all information bits are to be precoded.

关键词： Low-density parity-check (LDPC) codes precoding weight distribution decoding thresholds.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

基于Petri网的一类调度问题的分层控制器设计

引用

系统仿真学报 2007年第A1期19卷 142-144页

作者：张志明吴维敏段红霞工业控制技术国家重点实验室浙江大学先进控制研究所浙江杭州310027 南京城建项目管理发展有限公司江苏南京210006

利用Petri网中T不变量的思想,针对约束为T不变量的Parikh向量形式的job-shop调度问题,提出了一种分层控制器的设计算法,该算法有效地解决了这一有并发约束的控制问题。即使随着系统规模的增大,该方法计算量仍然很小,而且与经典的库所不... 详细信息

利用Petri网中T不变量的思想,针对约束为T不变量的Parikh向量形式的job-shop调度问题,提出了一种分层控制器的设计算法,该算法有效地解决了这一有并发约束的控制问题。即使随着系统规模的增大,该方法计算量仍然很小,而且与经典的库所不变量方法相比较,它不受有无自回路的约束,可有效地解决一类实际制造系统中的job-shop调度问题。

关键词： Petri网分层控制 T不变量 Parikh矢量调度

来源：

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

Frequency Features of Acoustic Emission on Failure Mechanisms in PE Self-reinforced Laminates

Frequency Features of Acoustic Emission on Failure Mechanism...

引用

第二届先进纺织材料及加工技术国际会议

作者： Xu Wang Huipin Zhang Xiong Yan(key lab of Textile Science and Technology Ministry of Education College of Textiles Donghua university Shanghai 201620 china)

The purpose of this study is to investigate frequency features of acoustic emission（AE）on different failure mechanisms in PE self reinforced *** kinds of specimen pure LDPE resin,single fiber composites（SFC）and UHMWPE/LDPE unidirectional laminate were prepared to obtain desired damage *** signals of matrix damage,interface debonding and fiber breakage can be activated by quasi-state tension of LDPE resin,[90] laminate and SFC *** Fourier transform（FFT）was used to obtain frequency information of four different failure mechanisms including matrix plastic deformation（F1）,matrix fracture（F2）,interface debonding（F3）and fiber breakage（F4）.The result revealed,frequency features were different on four failure *** distribution of F1 and F2 are below 100 kHz with peak frequency at about 40 *** distribution of F3 has two main regions 0-100 kHz and 200-300 kHz with peak frequency at about 40 kHz and 240 kHz *** of F4 also has two main regions 100-200 kHz and 400-500 kHz with peak frequency at about 150 kHz and 450 kHz *** result can be applied to identify failure mechanism in PE self-reinforced composites.

关键词： PE self-reinforced laminates Acoustic emission Frequency features Failure mechanisms

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

A Discussion on Stability of Offset-free Linear Model Predictive Control

A Discussion on Stability of Offset-free Linear Model Predic...

引用

第24届中国控制与决策会议

作者： Baocang Ding and Hongguang Pan the Ministry of Education key lab For Intelligent Networks and Network Security (MOE KLINNS lab), Department of Automation, School of Electronic and Information Engineering, Xi’an Jiao Tong university Tao Zou the Department of Automation, zhejiang university of Technology

An offset-free controller is one that drives controlled outputs to their set-point values at the steady state. In the literature, conditions for offset-free linear model predictive control are given for combined estimator （for both the artificial disturbance and system state）, steady-state target calculation, and dynamic controller. In the presence of steady-state target calculation, the framework for MPC is called the double-layered MPC. Usually, the offset-free property of the double-layered MPC is obtained under the assumption that the system is asymptotically stable. This paper discusses on the dynamic stability property which has been rarely considered in the literature of double-layered MPC.

关键词： Model predictive control Offset-free control Stability

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：