首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   82篇
  免费   7篇
  国内免费   12篇
电工技术   6篇
综合类   7篇
化学工业   3篇
金属工艺   10篇
机械仪表   3篇
建筑科学   1篇
石油天然气   2篇
武器工业   1篇
无线电   10篇
一般工业技术   8篇
冶金工业   4篇
原子能技术   1篇
自动化技术   45篇
  2021年   1篇
  2019年   3篇
  2018年   2篇
  2017年   2篇
  2016年   7篇
  2015年   3篇
  2014年   3篇
  2013年   9篇
  2012年   2篇
  2011年   9篇
  2010年   8篇
  2009年   9篇
  2008年   2篇
  2007年   4篇
  2006年   8篇
  2005年   8篇
  2004年   7篇
  2003年   7篇
  2002年   1篇
  2000年   2篇
  1999年   1篇
  1997年   1篇
  1995年   2篇
排序方式: 共有101条查询结果,搜索用时 0 毫秒
1.
A mechanism of synchronization of components of distributed systems in which communications are based on a common time schedule for all system components is illustrated by examples of simple Time-Triggered Protocols. For parametric linear models of synchronization, the optimization problem is considered for a parameter that should exclude the overlapping of messages in communication channels. The results of using numeric methods for estimation of the optimal value of this parameter are described. __________ Translated from Kibernetika i Sistemnyi Analiz, No. 3, pp. 24–32, May–June 2006.  相似文献   
2.
Extracellular vesicles (EV) are microparticles released in biological fluids by different cell types, both in physiological and pathological conditions. Owing to their ability to carry and transfer biomolecules, EV are mediators of cell-to-cell communication and are involved in the pathogenesis of several diseases. The ability of EV to modulate the immune system, the coagulation cascade, the angiogenetic process, and to drive endothelial dysfunction plays a crucial role in the pathophysiology of both autoimmune and renal diseases. Recent studies have demonstrated the involvement of EV in the control of renal homeostasis by acting as intercellular signaling molecules, mediators of inflammation and tissue regeneration. Moreover, circulating EV and urinary EV secreted by renal cells have been investigated as potential early biomarkers of renal injury. In the present review, we discuss the recent findings on the involvement of EV in autoimmunity and in renal intercellular communication. We focused on EV-mediated interaction between the immune system and the kidney in autoimmune diseases displaying common renal damage, such as antiphospholipid syndrome, systemic lupus erythematosus, thrombotic microangiopathy, and vasculitis. Although further studies are needed to extend our knowledge on EV in renal pathology, a deeper investigation of the impact of EV in kidney autoimmune diseases may also provide insight into renal biological processes. Furthermore, EV may represent promising biomarkers of renal diseases with potential future applications as diagnostic and therapeutic tools.  相似文献   
3.
一种基于正弦映射的混沌交织器设计及应用*   总被引:1,自引:1,他引:0  
陈朝  汤天浩 《计算机应用研究》2010,27(11):4276-4278
移动信道编码中交织器的设计直接影响Turbo码的距离谱和性能,其主要作用是提高低重序列的输出码重和减小译码输出之间的相关性。随机交织器在数据帧较长时性能比较好,通过码序列位置重置实现交织,利用正弦函数的混沌映射有很好的随机性和瞬时正交性的特点,实现了一种新型混沌随机交织器,提高了交织器的误码率性能,并且在伽利略卫星系统中应用达到接近理论值的编码效率和误码率的特性。  相似文献   
4.
基于离线可信第三方的电子支付协议公平性分析   总被引:1,自引:0,他引:1  
基于离线可信第三方的电子支付协议通常具有复杂结构,它由多个子协议组合而成,与传统认证协议有显著差别,主要表现在协议目标和攻击者模型两个方面.电子支付协议最主要目的是实现买卖双方的公平交换,同时假定交换双方都可能是不诚实的,需要考虑来自协议合法实体的内部攻击.在重新定义协议公平性和攻击者模型的基础上,提出扩展的串空间模型,以一个真实的电子支付协议为对象,演示了基于串空间理论的电子支付协议公平性形式化模型和分析方法,并指出该协议存在安全缺陷,提出改进意见.  相似文献   
5.
基于双曲线映射的签名设计了一种新型可分电子现金方案,方案中有效地加入了压缩支付和批处理支付,计算时间复杂度较小,从而使得系统的整体效率较高。另外,方案中无需可信第三方(TTP)的参与,因而系统的整体开销较小。方案的安全性基于q-SDK假设、计算离散对数困难性假设以及单向散列函数存在性假设。  相似文献   
6.
利用遗传算法求解中学课表安排问题   总被引:5,自引:0,他引:5  
论文采用三维编码方式及相应的遗传算子构成的遗传算法求解中学课表安排问题,通过实例验证该方法具有良好的收敛性,可产生比较优良的排课方案。  相似文献   
7.
在VC(可视密码)的实际应用中分发者和参与者均可能存在欺骗行为,导致秘密图像无法正确恢复,基于此提出了一种改进的防欺骗可视密码方案。该方案用 (可视密码方案)代替 来分享验证图像,不需要引入传统的TTP(可信第三方),可同时直接验证分发者和参与者的欺骗行为,提高了可视密码方案的实用性与安全性。  相似文献   
8.
结合常规时间-温度(TTP)参数法和粒子群优化算法(PSO),建立了 Larson -Miller(LM), Orr -Sherby -Dorn(OSD)和 Manson -Harferd(MH)模型,然后利用这3种模型对25Cr20NiNbN 钢的持久寿命进行了评估,并利用 Z 参数对3种参数模型的预测准确度进行分析。通过分析3种模型的预测结果,发现 MH 法的预测结果准确度最高。对不同可靠度下材料的持久寿命进行计算,保证了预测结果的可靠性。  相似文献   
9.
ABSTRACT

N-heteroacenes have received significant attention due to their unique properties, especially in applications of organic electronics. 9, 11, 20, 22-tetraaza-tetrapyridopentacene (TTP) has been prepared under two conditions, respectively. It is found that with addition of 2-iodoxybenzoic acid (IBX) as a catalyst, the yield of TTP rises from 83% to 94%, and the mechanism for this phenomenon is analyzed. After purified by physical transport sublimation, TTP was characterized by MALDI-TOF, FT-IR, and TGA. The structure of TTP has been solved by single-crystal X-ray diffraction analysis as well. All the results indicate TTP exhibits promising potential for applications in organic semiconductor devices.  相似文献   
10.
Precipitation kinetics of Nb(C,N) in microalloyed steels is crucial for the achievement of favoured steel properties. Therefore, numerous experimental studies have been performed in the past and various theoretical models have been developed to describe Nb(C,N) precipitation. However, the experimental data is sometimes contradictory and even the thermodynamic data for NbC solubility in austenite have a large scatter. In this paper, experimental results on the Nb(C,N) and NbV(C,N) precipitation kinetics in deformed and undeformed austenite are reviewed. Based on these data and with the precipitation kinetics module of the software package MatCalc, computer simulations are performed. The predicted interfacial energy of precipitates is adjusted to match the observed kinetics. A comparison between experimental information and simulation, i.e. time ‐ temperature ‐ precipitation (TTP) diagrams, is drawn and discussed. The results of the computer simulations using modified interfacial energies are in good agreement with the experiments.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号