首页 | 官方网站   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   8298篇
  免费   976篇
  国内免费   438篇
工业技术   9712篇
  2024年   17篇
  2023年   137篇
  2022年   232篇
  2021年   351篇
  2020年   289篇
  2019年   259篇
  2018年   282篇
  2017年   310篇
  2016年   336篇
  2015年   373篇
  2014年   450篇
  2013年   655篇
  2012年   566篇
  2011年   608篇
  2010年   519篇
  2009年   515篇
  2008年   475篇
  2007年   432篇
  2006年   442篇
  2005年   401篇
  2004年   265篇
  2003年   247篇
  2002年   217篇
  2001年   172篇
  2000年   159篇
  1999年   148篇
  1998年   140篇
  1997年   120篇
  1996年   89篇
  1995年   82篇
  1994年   69篇
  1993年   66篇
  1992年   31篇
  1991年   45篇
  1990年   27篇
  1989年   22篇
  1988年   24篇
  1987年   10篇
  1986年   9篇
  1985年   11篇
  1984年   16篇
  1983年   6篇
  1982年   13篇
  1981年   12篇
  1980年   12篇
  1979年   7篇
  1978年   6篇
  1977年   6篇
  1973年   6篇
  1972年   5篇
排序方式: 共有9712条查询结果,搜索用时 21 毫秒
1.
2.
3.
Several immune checkpoint molecules and immune targets in leukemic cells have been investigated. Recent studies have suggested the potential clinical benefits of immuno-oncology (IO) therapy against acute myeloid leukemia (AML), especially targeting CD33, CD123, and CLL-1, as well as immune checkpoint inhibitors (e.g., anti-PD (programmed cell death)-1 and anti-CTLA4 (cytotoxic T-lymphocyte-associated protein 4) antibodies) with or without conventional chemotherapy. Early-phase clinical trials of chimeric antigen receptor (CAR)-T or natural killer (NK) cells for relapsed/refractory AML showed complete remission (CR) or marked reduction of marrow blasts in a few enrolled patients. Bi-/tri-specific antibodies (e.g., bispecific T-cell engager (BiTE) and dual-affinity retargeting (DART)) exhibited 11–67% CR rates with 13–78% risk of cytokine-releasing syndrome (CRS). Conventional chemotherapy in combination with anti-PD-1/anti-CTLA4 antibody for relapsed/refractory AML showed 10–36% CR rates with 7–24 month-long median survival. The current advantages of IO therapy in the field of AML are summarized herein. However, although cancer vaccination should be included in the concept of IO therapy, it is not mentioned in this review because of the paucity of relevant evidence.  相似文献   
4.
艾俊哲  谢郢  周可心  池伸 《广东化工》2022,49(3):186-188
胶体电泳速度测定实验是大学物理化学实验中一个重要的综合性教学实验.本文针对该实验中存在半透膜制作不稳定、渗析时间过长、电泳现象不明显、胶体/辅助液界面不清晰等问题.从胶体浓度、电极电压、半透膜、稳定剂四个方面进行了改进.结果表明,胶体界面移动距离,胶体/辅助液界面的清晰程度都有很大的改善,大大提高了实验的体验感.  相似文献   
5.
6.
Tang  Yayuan  Guo  Kehua  Zhang  Ruifang  Xu  Tao  Ma  Jianhua  Chi  Tao 《World Wide Web》2020,23(2):1319-1340
World Wide Web - To solve the problem that users’ retrieval intentions are seldom considered by personalized websites, we propose an improved incremental collaborative filtering (CF)-based...  相似文献   
7.
Surfactant flooding has widely been used as one of the chemically enhanced oil recovery (EOR) techniques. Surfactants majorly influence the interfacial tension, γ, between oil and brine phase and control capillary number and relative permeability behavior and, thus, influence ultimate recovery. Additives, such as nanoparticles, are known to affect surfactant properties and are regarded as promising EOR agents. However, their detailed interactions with surfactants are not well understood. Thus, in this work, we examined the influence of silica nanoparticles on the ability of surfactants to lower γ and to increase viscosity at various temperatures and salinities. Results show that the presence of nanoparticles decreased γ between n-decane and various surfactant formulations by up to 20%. It was found that γ of nanoparticles–surfactant solutions passed through a minimum at 35 °C when salt was added. Furthermore, the viscosity of cationic surfactant solutions increased at specific salt (1.5 wt.%) and nanoparticle (0.05 wt.%) concentrations. Results illustrate that selected nanoparticles–surfactant formulations appear very promising for EOR as they can lower brine/n-decane interfacial tension and act as viscosity modifiers of the injected fluids.  相似文献   
8.
9.
Chi  Mucong  Liu  Jun  Yang  Jie 《Wireless Personal Communications》2020,111(4):2325-2351
Wireless Personal Communications - With the astounding growth of the information era, the amount of data increases at high speed. However, a significant fraction of the data residing in storage is...  相似文献   
10.
Efficient energy and temperature management techniques are essential elements for operators of cloud data centers. Dynamic virtual machine (VM) consolidation using live migration techniques presents a great opportunity for cloud service providers to adaptively reduce energy consumption and optimize their resource utilization. In recent studies, power consumption readings of individual physical hosts were chosen as the main monitoring parameters in their allocation policies, whereas very few have considered host temperature, which has shown to have a negative impact on server reliability, as a migration criterion. In this work, a thermal-aware VM consolidation mechanism is proposed for resource allocation optimization and server reliability assurance. We consider the variability in host temperature as a migration criterion to avoid outage incidents via having better VM consolidations. Extensive simulation results obtained from CloudSim show the promising performance of the proposed mechanism in energy saving while reducing the number of server outage incidents due to fluctuations in host temperature.  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-23

京公网安备 11010802026262号