全文获取类型
收费全文 | 234篇 |
免费 | 32篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 59篇 |
金属工艺 | 6篇 |
机械仪表 | 8篇 |
建筑科学 | 13篇 |
能源动力 | 13篇 |
轻工业 | 18篇 |
水利工程 | 3篇 |
石油天然气 | 1篇 |
无线电 | 25篇 |
一般工业技术 | 67篇 |
冶金工业 | 20篇 |
原子能技术 | 3篇 |
自动化技术 | 29篇 |
出版年
2024年 | 1篇 |
2023年 | 7篇 |
2022年 | 13篇 |
2021年 | 13篇 |
2020年 | 13篇 |
2019年 | 25篇 |
2018年 | 23篇 |
2017年 | 14篇 |
2016年 | 20篇 |
2015年 | 10篇 |
2014年 | 18篇 |
2013年 | 16篇 |
2012年 | 17篇 |
2011年 | 13篇 |
2010年 | 16篇 |
2009年 | 9篇 |
2008年 | 7篇 |
2007年 | 3篇 |
2006年 | 3篇 |
2005年 | 2篇 |
2002年 | 1篇 |
1999年 | 1篇 |
1998年 | 4篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 4篇 |
1994年 | 2篇 |
1987年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 1篇 |
排序方式: 共有267条查询结果,搜索用时 31 毫秒
1.
Ana Rita Gomes Nasim Bahram Sangani Tiago G. Fernandes M. Margarida Diogo Leopold M. G. Curfs Chris P. Reutelingsperger 《International journal of molecular sciences》2020,21(24)
The central nervous system (CNS) is the most complex structure in the body, consisting of multiple cell types with distinct morphology and function. Development of the neuronal circuit and its function rely on a continuous crosstalk between neurons and non-neural cells. It has been widely accepted that extracellular vesicles (EVs), mainly exosomes, are effective entities responsible for intercellular CNS communication. They contain membrane and cytoplasmic proteins, lipids, non-coding RNAs, microRNAs and mRNAs. Their cargo modulates gene and protein expression in recipient cells. Several lines of evidence indicate that EVs play a role in modifying signal transduction with subsequent physiological changes in neurogenesis, gliogenesis, synaptogenesis and network circuit formation and activity, as well as synaptic pruning and myelination. Several studies demonstrate that neural and non-neural EVs play an important role in physiological and pathological neurodevelopment. The present review discusses the role of EVs in various neurodevelopmental disorders and the prospects of using EVs as disease biomarkers and therapeutics. 相似文献
2.
3.
The effect of nickel and molybdenum concentrations on the phase transformation and mechanical properties of conventional 18Ni(350)
maraging steel has been investigated. Both of these elements act as strong austenite stabilizers. When the concentration of
molybdenum or nickel is greater than 7.5 or 24 wt %, respectively, the austenite phase remains stable up to room temperature.
In both molybdenum- and nickel-alloyed steels, the austenite phase could be transformed to martensite by either dipping the
material in liquid nitrogen or subjecting it to cold working. When 7.5 wt% Mo and 24 wt% Ni were added in combination, however,
the austenite phase obtained at room temperature did not transform to martensite when liquid-nitrogen quenched or even when
cold rolled to greater than 95% reduction. The aging response of these materials has also been investigated using optical,
scanning electron, and scanning transmission electron microscopy. 相似文献
4.
Zarghami Mahdi Safari Nasim Szidarovszky Ferenc Islam Shafiqul 《Water Resources Management》2015,29(12):4285-4303
Water Resources Management - This paper shows the utility of a new interval cooperative game theory as an effective water diplomacy tool to resolve competing and conflicting needs of water users... 相似文献
5.
The practice of service-based manufacturing, utilized in various industries, particularly in electronics, pharmaceuticals, and automotive, is on the rise as it improves enterprise effectiveness in dynamic markets. The mutual responsibilities between the supplier(s) and user(s) of such services are spelled out in defined-time-horizon contracts. While such contracts define mutual obligations of both parties on a tactical/operational level, the long-term strategic objectives of the parties may be in conflict. This paper is focused on studying the dynamics of manufacturing service contracts. It investigates the factors affecting the shape of the negotiation space for such contracts and also the way the space should be navigated in response to changing market conditions. The paper presents an analytical framework developed to facilitate behavior analysis of the actors involved in the contract. 相似文献
6.
Tianyu Du Chunqiu Zhao Fawad ur Rehman Lanmei Lai Xiaoqi Li Yi Sun Shouhua Luo Hui Jiang Matthias Selke Xuemei Wang 《Nano Research》2017,10(8):2626-2632
Early diagnosis remains highly important for efficient cancer treatment,and hence,there is significant interest in the development of effective imaging strategies.This work reports a new multimodal bioimaging method for accurate and rapid diagnosis of cancer cells by introducing aqueous Fe2+ and Zn2+ ions into cancer cells (i.e.,HeLa,U87,and HepG2 cancer cells).We found that the biocompatible metal ions Fe2+ and Zn2+ forced the cancer cells to spontaneously synthesize fluorescent ZnO nanoclusters and magnetic Fe3O4 nanoclusters.These clusters could then be used for multimodal cancer imaging by combining fluorescence imaging with magnetic resonance imaging and computed tomography imaging.Meanwhile,for normal cells (i.e.,L02) and tissues,neither fluorescence nor any other obvious difference could be detected between preand post-injection.This multimodal bioimaging strategy based on the in situ biosynthesized Zn&Fe oxide nanoclusters might therefore be useful for early cancer diagnosis and therapy. 相似文献
7.
8.
Muhammad Faisal Michael B. C. Khoo Ayesha Nayab Raja Fawad Zafar 《Quality and Reliability Engineering International》2023,39(1):472-477
Link relative-based approach was used in an article (see reference 1) to enhance the performance of the cumulative sum (CUSUM) control chart. This technique involves the use of firstly, the link relative variable to convert the process observations in a relative to the mean form and secondly, optimal constants to define a new variable which is used as the plotting statistic of the link relative CUSUM chart. In this article, it is proven through simulation study that the optimal constants with fixed values, as reported in the aforementioned article, give different results. Instead, if the regression technique is used, then the same results will be obtained. 相似文献
9.
Traditional, hands-on dissection of an animal is common practice in many classrooms to aid in the study of anatomy and biology.
More specifically, virtual dissection environments have been developed making it possible to study the inner workings of animals
without cutting them up. In this paper, we present a novel virtual reality dissection simulator, where a user can dissect
an animal (i.e. frog) and its organs using a 3D force feedback haptic device. The simulator uses force feedback as part of
a multimodal cue to provide guidance and performance feedback to the user. This paper highlights methodologies which are used
for addressing some of the key challenges involved in designing and developing simulators, such as: modelling and mechanics
of deformation, collision detection between multiple deformable bodies, and haptic feedback. 相似文献
10.
The circle formed in the course of surveying the movement from idea to work—which makes the act of creation—and from work to idea—which is concerned with the sphere of thinking, cognition and perception—leads to the formation of culture and civilization. Formation of any civilization is a direct result of interaction between ideas and forms. If there is no idea, there will be no form, and if there is no form, promotion of idea will be meaningless. From the ancient time, the religious-mythical idea, as a whole idea, has been leading to other ideas including philosophical, mystical and political ideas. Architecture, as a historical form, has been the outcome of interactions between the triple ideas proposed under the religious idea. In this study, an attempt is made to explain the role of each idea in the creation of architectural works of Achaemenid civilization by defining them. It also aims to review the historical form of the Achaemenid era, which was based on a philosophical-political idea, in order to investigate the role of this period in relation to architectural form which is addressed with a kind of pluralism. In other words, the main objective was to clarify the interaction between the prevailing notion of time and architectural works. 相似文献