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2003-2022 全部
为您找到包含“973”的内容共1076

刘勐,余重秀

2011-12-09

本文主要对全光信号再生中的再整形技术进行了研究。阐述了基于光纤四波混频效应进行光信号再整形的理论依据,在单级再生方案的基础上对基于色散位移光纤(DSF)四波混频的光信号再生级联方案进行了仿真研究,分析、对比了两种方案的模拟结果;仿真结果表明:级联方案能更好的提高消光比和Q值,减少噪声,提高信噪比,得到良好的再整形性能。

国家自然科学基金(973

北京邮电大学信息光子学与光通信研究院,北京 100876,北京邮电大学信息光子学与光通信研究院,北京 100876

#电子、通信与自动控制技术#

0评论(0 分享(0)

张林林,肖于德,周娟,黎文献

2005-09-08

采用OM,SEM,XRD,力学拉伸试验,硬度试验等测试手段研究了单独添加Mg及同时添加Mg和Cu对铸态Al-Fe-V-Si合金及其热挤压棒材显微组织和力学性能的影响,考察了固溶时效处理对同时添加Mg和Cu的Al-Fe-V-Si合金力学性能的影响。结果表明:添加Mg可以明显细化Al-Fe-V-Si合金的铸造组织,改善铝铁相的形貌与分布,还有利于提高合金的硬度与强度;同时添加Mg和Cu,Cu抵消部分Mg的细化作用,但经过淬火时效后,形成Mg2Si、Al2Cu和Al2CuMg相,使得Al-Fe-V-Si合金的硬度与强度进一步提高。

973(TG1999064912

中南大学材料科学与工程学院,中南大学材料科学与工程学院,中南大学材料科学与工程学院,中南大学材料科学与工程学院

#材料科学#

0评论(0 分享(0)

张林林,肖于德,周娟,黎文献

2005-09-12

在铸态Al-Fe-V-Si合金中加入不同含量的Be,考察其对Al-Fe-V-Si合金组织和力学性能的影响。结果表明:元素Be的加入能使铸态Al-Fe-V-Si合金中粗大针状铝铁相得到明显改善,基体晶粒得到细化,力学性能提高。在分析实验结果的基础上,对不同Be添加量的细化变质效果略做比较,综合来看,加入1.28%Be的合金中针状铝铁相已经消失,基体晶粒细小,力学性能较好。

973(TG1999064912

中南大学材料科学与工程学院,中南大学材料科学与工程学院,中南大学材料科学与工程学院,中南大学材料科学与工程学院

#材料科学#

0评论(0 分享(0)

张林林,肖于德,周娟,黎文献

2005-09-14

总结了Al-Fe-V-Si系铝合金中常用的添加元素,以及各元素在合金中的作用及影响,并提出了一些看法。

973(TG1999064912

中南大学材料科学与工程学院,中南大学材料科学与工程学院,中南大学材料科学与工程学院,中南大学材料科学与工程学院

#材料科学#

0评论(0 分享(0)

李仁泽,谢斌福,王崇骏

2013-06-04

为了解决昂贵中药材的廉价替代品问题,本文利用药物的配伍规律和性味归经描述来衡量药物的相似度。具体定义了两种相似度的度量方式,分别为基于药物配伍集合的相似度(similarity based on collocation herbs,简记为simchs)和基于药物配伍和性味归经的相似度(similarity based on collocation herbs and tropism of taste,简记为simchstt),并通过实验验证了两种度量方式衡量相似药物的可行性,对比了两种度量方式下聚类的准确率和聚类大小,证明了simchstt相对于simchs在准确率上有了较大的提升。

973计划(NO2011CB505300

南京大学计算机科学与技术系,南京 210023,南京大学计算机科学与技术系,南京 210023,南京大学计算机科学与技术系,南京 210023

#计算机科学技术#

0评论(0 分享(0)

SHEN Xiaoli,JIA Fengju,SONG Ning,XIE Junxia,JIANG Hong

In this paper Objective Obestatin is an endogenous peptide sharing the same peptide precursor with ghrelin. We aimed to investigate whether and how obestatin could exert neuroprotective effects on MES23.5 dopaminergic cells against 1-methyl-4-phenylpyridinium (MPP+)-induced neurotoxicity. Methods MES23.5 cells were pretreated with obestatin (10-13 ~ 10-6 mol/L) for 20 min prior to 200 μmol/L MPP+ incubation for 12 or 24 hrs, or treated with different doses of obestatin (10-13 ~ 10-7 mol/L) for 0, 6, 12, 24 hrs, respectively. Methyl thiazolyl tetrazolium (MTT) assay was used to measure cell viability. Flow cytometry was used to measure the caspase-3 activity and the mitochondrial transmembrane potential. Proliferating cell nuclear antigen (PCNA) protein levels were determined by western blotting. Results Obestatin (10-13 ~ 10-7 mol/L) pretreatment could block or even reverse MPP+-induced reduction of cell viability in MES23.5 cells. Solely obestatin treatment increased cell viability. However, it had no effects on MPP+-induced mitochondrial transmembrane potential collapse and caspase-3 activation. Elevated PCNA levels were observed with 10-7, 10-9, 10-11 and 10-13 mol/L obestatin treatment for 12 hrs. Conclusion The protective effects of obestatin against MPP+ in MES23.5 cells were due to its proliferative rather than anti-apoptotic effects.

2013-11-04

973 Program (2012CB526703

Department of Physiology,Medical College of Qingdao University,Department of Physiology,Medical College of Qingdao University,Department of Physiology,Medical College of Qingdao University,Department of Physiology,Medical College of Qingdao University,Department of Physiology,Medical College of Qingdao University

#Biology#

0评论(0 分享(0)

张殿宝,施萍,庞希宁

2011-12-13

上皮间充质转化(epithelial-mesenchymal transition, EMT)是指上皮细胞在某些生理或病理条件下失去上皮细胞特征并获得间充质细胞特征的生物学过程,其间涉及复杂的调控网络与分子机制。根据其在不同的生物学过程中起作用分为三个类型。在创伤修复的复杂过程中,表皮细胞经历EMT过程进行再生重建表皮层,对该过程进行深入研究对于创伤修复乃至干细胞与组织工程具有潜在意义。本文就此予以综述。

973计划(2012CB518100

中国医科大学,细胞生物学卫生部重点实验室,干细胞与再生医学研究室,沈阳 110001,中国医科大学附属第一医院全科医学教研室,沈阳 110001,中国医科大学 细胞生物学卫生部重点实验室 干细胞与再生医学研究室,沈阳 110001

#生物学#

0评论(0 分享(0)

ZHU Wanjiao,DING Hangchen,TONG Wenyi,GONG Shijing,WAN Xiangang,DUAN Chun-Gang

We propose that it is possible to engineer both the magnetic anisotropy energy (MAE) and the electric field modification of the MAE of ferromagnetic films. Using our recently developed orbital selective external potential (OSEP) method, we have unambiguously identified different contributions of each atomic orbital to the MAE of the ferromagnetic metal films, and find that the occupation of 3 dz2orbital is the key issue for the system to display large electric field response. Based on the theoretical conclusion, we have successfully designed several interesting Fe monolayers which demonstrate dramatically different MAE and could exhibit strong electric field control of magnetism. Our work may open a new avenue to the artificial design of electrically controlled magnetic devices.

2014-10-03

973 Programs (No. 2014CB921104

Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai 200241, China,Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai 200241, China,Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai 200241, China,Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai 200241, China,Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China,Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai 200241, China

#Physics#

0评论(0 分享(0)

LIU Wei,BAO Xin,MAO Lingling,JIRI Tucek,RADEK Zboril,LIU Junliang,GUO Fusheng,NI Zhaoping,TONG Mingliang

An unprecedented chiral metal-organic framework with spin crossover (SCO) property, [FeII(mptpy)2]?EtOH?0.2 DMF (1?nsolv), has been solvothermally synthesized through spontaneous resolution. It displays remarkable stability and two-step SCO under (Tc1 = 200 K) and above (Tc2 = 357 K) room temperature.

2014-01-08

SRFDP(20100171110015

NSFC(91122032

“973 Project”( 21371183

School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275,School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275,School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275,Regional Centre of Advanced Technologies and Materials, Palacky University in Olomouc,Regional Centre of Advanced Technologies and Materials, Palacky University in Olomouc,School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275,School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275,School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275,School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275

#Chemistry#

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雍国清,张春伟,陈云飞

2014-03-13

随着电子技术的发展,电子芯片散热已经达到极限,芯片的散热研究迫在眉睫,本篇文章采用飞秒激光瞬态热反射技术,分别测量了铝与石墨(GAl/g)以及铝与表面氧离子照射的石墨(GAl/O-g)之间的界面热导,实验结果表明,经过氧离子照射的石墨与铝之间的界面热导提高了接近30%,并且还发现调制频率较低时,调制频率的变化对于界面热导的测量影响较小。

国家973计划项目(2011CB707605

东南大学机械学院,南京 210000,东南大学机械学院,南京 210000,东南大学机械学院,南京 210000

#机械工程#

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