全文获取类型
收费全文 | 180篇 |
免费 | 10篇 |
专业分类
电工技术 | 4篇 |
综合类 | 1篇 |
化学工业 | 48篇 |
金属工艺 | 15篇 |
机械仪表 | 3篇 |
建筑科学 | 7篇 |
能源动力 | 15篇 |
轻工业 | 12篇 |
无线电 | 18篇 |
一般工业技术 | 27篇 |
冶金工业 | 19篇 |
原子能技术 | 3篇 |
自动化技术 | 18篇 |
出版年
2024年 | 1篇 |
2023年 | 3篇 |
2022年 | 7篇 |
2021年 | 5篇 |
2020年 | 5篇 |
2019年 | 10篇 |
2018年 | 10篇 |
2017年 | 9篇 |
2016年 | 4篇 |
2015年 | 8篇 |
2014年 | 10篇 |
2013年 | 13篇 |
2012年 | 7篇 |
2011年 | 11篇 |
2010年 | 13篇 |
2009年 | 9篇 |
2008年 | 7篇 |
2007年 | 7篇 |
2006年 | 13篇 |
2005年 | 8篇 |
2004年 | 4篇 |
2003年 | 4篇 |
2002年 | 2篇 |
2000年 | 1篇 |
1998年 | 6篇 |
1997年 | 4篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1988年 | 3篇 |
1978年 | 1篇 |
排序方式: 共有190条查询结果,搜索用时 0 毫秒
1.
Jit Biswas Andrei Tolstikov Maniyeri Jayachandran Victor Foo Aung Aung Phyo Wai Clifton Phua Weimin Huang Louis Shue Kavitha Gopalakrishnan Jer-En Lee Philip Yap 《电信纪事》2010,65(9-10):505-521
Monitoring and timely intervention are extremely important in the continuous management of health and wellness among all segments of the population, but particularly among those with mild dementia. In relation to this, we prescribe three design principles for the construction of services and applications. These are ambient intelligence, service continuity, and micro-context. In this paper, we provide three exemplars from our research and development activities that illustrate the use of these design principles in the construction of services and applications. All the applications are drawn from the field of care for mild dementia patients in their living quarters. 相似文献
2.
Aishani Mazumder Chung Kim Nguyen Thiha Aung Mei Xian Low Md. Ataur Rahman Salvy P. Russo Sherif Abdulkader Tawfik Shifan Wang James Bullock Vaishnavi Krishnamurthi Nitu Syed Abhishek Ranjan Ali Zavabeti Irfan H. Abidi Xiangyang Guo Yongxiang Li Taimur Ahmed Torben Daeneke Akram Al-Hourani Sivacarendran Balendhran Sumeet Walia 《Advanced functional materials》2023,33(36):2303641
Miniaturization and energy consumption by computational systems remain major challenges to address. Optoelectronics based synaptic and light sensing provide an exciting platform for neuromorphic processing and vision applications offering several advantages. It is highly desirable to achieve single-element image sensors that allow reception of information and execution of in-memory computing processes while maintaining memory for much longer durations without the need for frequent electrical or optical rehearsals. In this work, ultra-thin (<3 nm) doped indium oxide (In2O3) layers are engineered to demonstrate a monolithic two-terminal ultraviolet (UV) sensing and processing system with long optical state retention operating at 50 mV. This endows features of several conductance states within the persistent photocurrent window that are harnessed to show learning capabilities and significantly reduce the number of rehearsals. The atomically thin sheets are implemented as a focal plane array (FPA) for UV spectrum based proof-of-concept vision system capable of pattern recognition and memorization required for imaging and detection applications. This integrated light sensing and memory system is deployed to illustrate capabilities for real-time, in-sensor memorization, and recognition tasks. This study provides an important template to engineer miniaturized and low operating voltage neuromorphic platforms across the light spectrum based on application demand. 相似文献
3.
4.
5.
6.
7.
A Fluorimetric Readout Reporting the Kinetics of Nucleotide‐Induced Human Ribonucleotide Reductase Oligomerization 下载免费PDF全文
Dr. Yuan Fu Dr. Hong‐Yu Lin Somsinee Wisitpitthaya William A. Blessing Prof. Yimon Aye 《Chembiochem : a European journal of chemical biology》2014,15(17):2598-2604
Human ribonucleotide reductase (hRNR) is a target of nucleotide chemotherapeutics in clinical use. The nucleotide‐induced oligomeric regulation of hRNR subunit α is increasingly being recognized as an innate and drug‐relevant mechanism for enzyme activity modulation. In the presence of negative feedback inhibitor dATP and leukemia drug clofarabine nucleotides, hRNR‐α assembles into catalytically inert hexameric complexes, whereas nucleotide effectors that govern substrate specificity typically trigger α‐dimerization. Currently, both knowledge of and tools to interrogate the oligomeric assembly pathway of RNR in any species in real time are lacking. We therefore developed a fluorimetric assay that reliably reports on oligomeric state changes of α with high sensitivity. The oligomerization‐directed fluorescence quenching of hRNR‐α, covalently labeled with two fluorophores, allows for direct readout of hRNR dimeric and hexameric states. We applied the newly developed platform to reveal the timescales of α self‐assembly, driven by the feedback regulator dATP. This information is currently unavailable, despite the pharmaceutical relevance of hRNR oligomeric regulation. 相似文献
8.
Mi Mi Saine Aye 《Chemical engineering science》2005,60(23):6702-6717
Stricter and ever increasing environmental legislations and demand for higher quality products are the driving forces for the refiner in an attempt to characterise the refining streams on the molecular basis. The objective of this work is to develop a new methodology to interrelate the bulk properties and molecular information of the refining streams in order for refiners to look at the contribution of each molecular group on the properties of the refining streams.The molecular information of a particular refining stream is presented in the form of MTHS (molecular type homologous series) matrix representation [Peng, B., 1999. Molecular modelling of petroleum processes. Ph.D. Thesis, UMIST]. To enhance the accuracy and usability of the method, structural contribution of each isomer on various properties such as octane number, and reid vapour pressure, etc. are considered. Structural lumping rules are then applied to obtain the physical properties of each homologous series. Databases are set up for the properties and molecular information of typical refining streams. Automatic selection of sample matrices through linear combination is used to predict new composition matrices. The methodology is illustrated for refining streams with gasoline range hydrocarbons. The properties predicted based on the new methodology proves to be within 5-6% error range. 相似文献
9.
The aim of this paper is to simulate the performance of an air source heat pump water heater using carbon dioxide (CO2) as a working fluid. The heat pump water heating system consists of a compressor, a gas cooler, an expansion device and an evaporator. The computer simulation model has been developed by using the heat transfer data and the thermodynamic properties of CO2. The effects on the heat pump performance by the operating parameters such as the compressor rotational speed, the inlet water temperature at the gas cooler, the inlet air temperature at the evaporator and the mass flow rate ratio of water to refrigerant were presented. For rated capacities of a 4 kW compressor with a 10 kW gas cooler and a 6 kW evaporator, the coefficient of performance is found to be between 2.0 and 3.0. The mass flow rate ratio of water and CO2 between 1.2 and 2.2 is the most suitable value for generating hot water temperature above 60°C at 15–25°C ambient air temperature. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
10.
CoVID-19 is a multi-symptomatic disease which has made a global impact due to its ability to spread rapidly, and its relatively high mortality rate. Beyond the heroic efforts to develop vaccines, which we do not discuss herein, the response of scientists and clinicians to this complex problem has reflected the need to detect CoVID-19 rapidly, to diagnose patients likely to show adverse symptoms, and to treat severe and critical CoVID-19. Here we aim to encapsulate these varied and sometimes conflicting approaches and the resulting data in terms of chemistry and biology. In the process we highlight emerging concepts, and potential future applications that may arise out of this immense effort. 相似文献