全文获取类型
| 收费全文 | 4754篇 |
| 免费 | 48篇 |
| 国内免费 | 4篇 |
专业分类
| 电工技术 | 40篇 |
| 综合类 | 1篇 |
| 化学工业 | 390篇 |
| 金属工艺 | 53篇 |
| 机械仪表 | 47篇 |
| 建筑科学 | 89篇 |
| 矿业工程 | 7篇 |
| 能源动力 | 39篇 |
| 轻工业 | 329篇 |
| 水利工程 | 18篇 |
| 石油天然气 | 7篇 |
| 无线电 | 210篇 |
| 一般工业技术 | 365篇 |
| 冶金工业 | 2791篇 |
| 原子能技术 | 17篇 |
| 自动化技术 | 403篇 |
出版年
| 2022年 | 19篇 |
| 2021年 | 34篇 |
| 2020年 | 37篇 |
| 2019年 | 40篇 |
| 2018年 | 40篇 |
| 2017年 | 36篇 |
| 2016年 | 35篇 |
| 2015年 | 32篇 |
| 2014年 | 48篇 |
| 2013年 | 123篇 |
| 2012年 | 80篇 |
| 2011年 | 111篇 |
| 2010年 | 88篇 |
| 2009年 | 78篇 |
| 2008年 | 102篇 |
| 2007年 | 110篇 |
| 2006年 | 94篇 |
| 2005年 | 67篇 |
| 2004年 | 69篇 |
| 2003年 | 70篇 |
| 2002年 | 68篇 |
| 2001年 | 45篇 |
| 2000年 | 55篇 |
| 1999年 | 141篇 |
| 1998年 | 849篇 |
| 1997年 | 499篇 |
| 1996年 | 314篇 |
| 1995年 | 184篇 |
| 1994年 | 137篇 |
| 1993年 | 197篇 |
| 1992年 | 49篇 |
| 1991年 | 40篇 |
| 1990年 | 42篇 |
| 1989年 | 54篇 |
| 1988年 | 38篇 |
| 1987年 | 38篇 |
| 1986年 | 37篇 |
| 1985年 | 45篇 |
| 1984年 | 26篇 |
| 1983年 | 34篇 |
| 1982年 | 46篇 |
| 1981年 | 40篇 |
| 1980年 | 52篇 |
| 1979年 | 25篇 |
| 1978年 | 25篇 |
| 1977年 | 51篇 |
| 1976年 | 119篇 |
| 1975年 | 26篇 |
| 1972年 | 12篇 |
| 1963年 | 13篇 |
排序方式： 共有4806条查询结果，搜索用时 31 毫秒
941.
942.
Christelle Schaffer-Lequart Undine Lehmann Alastair B. Ross Olivier Roger Alison L. Eldridge Edwin Ananta 《Critical reviews in food science and nutrition》2017,57(8):1562-1568
Some countries now incorporate recommendations for increased consumption of whole grain (WG) into local dietary guidelines. Cereal and pseudo-cereal grains are good sources of complex carbohydrates, dietary fiber, proteins, phytochemicals, vitamins and minerals. However, research shows that the large majority of consumers are still falling short of WG consumption goals. To address this, we are actively involved in research to help increase the WG content of processed foods without compromising on taste and texture. In order to ensure consumer trust, the advancement of process technologies in incorporating WG to produce tasty food has to go hand in hand with well designed clinical trials that confirm the health benefits resulting from diets rich in WG. 相似文献
943.
This paper examines the dynamics of entrepreneurial acquisitions undertaken by UK high growth small and medium enterprises (SMEs). While entrepreneurial acquisitions are increasingly deployed by SMEs, little is known about their antecedents, motivational drivers and organisational outcomes. Drawing on detailed case study evidence from Scotland, the key factor found to be driving these acquisitions was the desire to augment and exploit technological complementarities between the acquiring and acquired firms. Acquisition can therefore be conceptualised as an advanced stage of the outside-in ‘open innovation’ strategies proactively used within these innovative SMEs. Firms executing this strategy typically have an acute propensity for risk, a desire for close customer engagement, effective business models and strong external orientation. The work suggests that greater attention should be paid within M&A theory to the dynamics of these types of smaller scale entrepreneurial acquisitions. 相似文献
944.
Grace G. D. Han Kun‐Hua Tu Farnaz Niroui Wenshuo Xu Si Zhou Xiaochen Wang Vladimir Bulović Caroline A. Ross Jamie H. Warner Jeffrey C. Grossman 《Advanced functional materials》2017,27(45)
Monolayer 2D MoS2 grown by chemical vapor deposition is nanopatterned into nanodots, nanorods, and hexagonal nanomesh using block copolymer (BCP) lithography. The detailed atomic structure and nanoscale geometry of the nanopatterned MoS2 show features down to 4 nm with nonfaceted etching profiles defined by the BCP mask. Atomic resolution annular dark field scanning transmission electron microscopy reveals the nanopatterned MoS2 has minimal large‐scale crystalline defects and enables the edge density to be measured for each nanoscale pattern geometry. Photoluminescence spectroscopy of nanodots, nanorods, and nanomesh areas shows strain‐dependent spectral shifts up to 15 nm, as well as reduction in the PL efficiency as the edge density increases. Raman spectroscopy shows mode stiffening, confirming the release of strain when it is nanopatterned by BCP lithography. These results show that small nanodots (≈19 nm) of MoS2 2D monolayers still exhibit strong direct band gap photoluminescence (PL), but have PL quenching compared to pristine material from the edge states. This information provides important insights into the structure–PL property correlations of sub‐20 nm MoS2 structures that have potential in future applications of 2D electronics, optoelectronics, and photonics. 相似文献
945.
946.
Ross Sparks 《Quality and Reliability Engineering International》2016,32(5):1871-1888
This paper investigates detecting significant increases in communication patterns and levels between small groups of individuals within a moderate‐size targeted group. Potential applications range from trying to establish emerging thought leaders within an organisation to the detection of the planning stages of a crime. The scan statistic is a popular choice for monitoring and detecting spatio‐temporal outbreaks, but it is difficult to apply to large‐scale target groups because of the computational effort required. When monitoring communication levels between thousands of people, the number of combinations of people whose communication may have increased is very high, and to scan through all of these to find which combinations have increased communications significantly is an enormous task. A successful surveillance plan will have early communication outbreak detection properties and good diagnostic capabilities for identifying individuals contributing to this outbreak. This paper proposes a new computationally feasible approach for detecting communication outbreaks based on exponentially weighted moving average smoothed communication counts between individuals within the network. We apply a cumulative sum of ordered signal‐to‐noise (SN) ratios for communication counts to flag significant departures from their respective median values. This plan is demonstrated to be efficient at detecting changes in communication levels for a small part of the network and diagnosing who is involved in the outbreak. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
947.
The development of the fiber distributed data interface (FDDI), a 100-Mb/s token ring that uses optical fiber that has become the premier high-speed local area network (LAN) standard, is examined. The important decisions that shaped FDDI are described. It is shown that technical innovation came from a variety of contributors and that adopting their ideas converted contributors into supporters. Adopting new ideas also improved the FDDI standards; by the time FDDI matured, it had become a family of standards with much broader appeal than was imagined initially 相似文献
948.
949.
950.
Implementation issues such as synchronization, implementation of abstract data types, and scheduling of processes are usually not addressed in the formal derivation of parallel programs. We seek to redress the situation by considering these issues in the context of developing an efficient implementation of an actual parallel program. The computational problem that we proceed by developingan algorithm in Unity and investigating the issues that arise in producing an efficient C implementation of the resulting algorithm. Along the way, we develop some theorems about program refinements, and illustrate the usefulness of the theorems in the context of refining the original Unity program.Work supported in part by ONR Grants N00014-86-K-0763 and N00014-87-K-0510 while the author was at The University of Texas at Austin. 相似文献