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排序方式: 共有604条查询结果,搜索用时 328 毫秒
71.
Murali K. Akkapeddi 《Polymer》1979,20(10):1215-1216
The free radical copolymerization of α-methylene γ-butyrolactone (α-MBL, I) has been studied at 60°C, with methyl methacrylate, styrene, acrylamide, acrylonitrile and vinylene carbonate, respectively. The reactivity ratios thus determined generally establish the high reactivity of α-MBL as a comonomer. 相似文献
72.
73.
Tang Q Tummala N Gupta SK Schwiebert L 《IEEE transactions on bio-medical engineering》2005,52(7):1285-1294
A network of biosensors can be implanted in a human body for health monitoring, diagnostics, or as a prosthetic device. Biosensors can be organized into clusters where most of the communication takes place within the clusters, and long range transmissions to the base station are performed by the cluster leader to reduce the energy cost. In some applications, the tissues are sensitive to temperature increase and may be damaged by the heat resulting from normal operations and the recharging of sensor nodes. Our work is the first to consider rotating the cluster leadership to minimize the heating effects on human tissues. We explore the factors that lead to temperature increase, and the process for calculating the specific absorption rate (SAR) and temperature increase of implanted biosensors by using the finite-difference time-domain (FDTD) method. We improve performance by rotating the cluster leader based on the leadership history and the sensor locations. We propose a simplified scheme, temperature increase potential, to efficiently predict the temperature increase in tissues surrounding implanted sensors. Finally, a genetic algorithm is proposed to exploit the search for an optimal temperature increase sequence. 相似文献
74.
Gold nanoparticles of triangular morphology possess interesting optical properties with potential application in medicine and infrared absorbing coatings, however, little is known about conditions that favor their growth. In this paper, we have reinvestigated a time-tested recipe for the formation of gold nanospheres by citrate reduction of aqueous gold ions under boiling conditions (Turkevich recipe). Our principle findings are that gold nanotriangle formation is kinetically controlled and is highly favored at low temperatures. Furthermore, the presence of chloride ions from the precursor chloroaurate ions plays a major role in promoting the growth of <111> oriented triangular/truncated triangular particles. The presence of bromide and iodide ions that possess the ability to replace surface-bound chloride ions inhibits triangle formation to varying degrees. 相似文献
75.
Senapati S Ahmad A Khan MI Sastry M Kumar R 《Small (Weinheim an der Bergstrasse, Germany)》2005,1(5):517-520
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An enhanced hybrid scheme of wavelength reservation for dynamic wavelength routed optical networks is proposed. The performance of a newly introduced composite-two-phase reservation protocol (C2P-RP) is evaluated and compared with the existing hybrid reservation protocol. By offering connection requests an enhanced scope of finding an end-to-end available wavelength, the C2P-RP scheme shows improved connection-request blocking performance. 相似文献
79.
Guillermo Talavera Murali Jayapala Jordi Carrabina Francky Catthoor 《Journal of Signal Processing Systems》2008,53(3):271-284
Nowadays embedded systems are growing at an impressive rate and provide more and more sophisticated applications characterized
by having a complex array index manipulation and a large number of data accesses. Those applications require high performance
specific computation that general purpose processors can not deliver at a reasonable energy consumption. Very long instruction
word architectures seem a good solution providing enough computational performance at low power with the required programmability
to speed up the time to market. Those architectures rely on compiler effort to exploit the available instruction and data
parallelism to keep the data path busy all the time. With the density of transistors doubling each 18 months, more and more
sophisticated architectures with a high number of computational resources running in parallel are emerging. With this increasing
parallel computation, the access to data is becoming the main bottleneck that limits the available parallelism. To alleviate
this problem, in current embedded architectures, a special unit works in parallel with the main computing elements to ensure
efficient feed and storage of the data: the address generator unit, which comes in many flavors. Future architectures will
have to deal with enormous memory bandwidth in distributed memories and the development of address generators units will be
crucial for effective next generation of embedded processors where global trade-offs between reaction-time, bandwidth, energy
and area must be achieved. This paper provides a survey of methods and techniques that optimize the address generation process
for embedded systems, explaining current research trends and needs for future.
相似文献
Francky CatthoorEmail: |
80.
到了2010年,“超越摩尔定律(More Than Moore)”的业界思潮将进一步推动系统集成(而不是晶体管密度)的发展,并引发具有超强功能的电子设备的革命。 相似文献