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51.
Derya Eren Akyol G. Mirac Bayhan 《The International Journal of Advanced Manufacturing Technology》2008,37(5-6):576-588
This paper addresses the problem of scheduling a set of independent jobs with sequence-dependent setups and distinct due dates
on non-uniform multi-machines to minimize the total weighted earliness and tardiness, and explores the use of artificial neural
networks as a valid alternative to the traditional scheduling approaches. The objective is to propose a dynamical gradient
neural network, which employs a penalty function approach with time varying coefficients for the solution of the problem which
is known to be NP-hard. After the appropriate energy function was constructed, the dynamics are defined by steepest gradient
descent on the energy function. The proposed neural network system is composed of two maximum neural networks, three piecewise
linear and one log-sigmoid network all of which interact with each other. The motivation for using maximum networks is to
reduce the network complexity and to obtain a simplified energy function. To overcome the tradeoff problem encountered in
using the penalty function approach, a time varying penalty coefficient methodology is proposed to be used during simulation
experiments. Simulation results of the proposed approach on a scheduling problem indicate that the proposed coupled network
yields an optimal solution which makes it attractive for applications of larger sized problems. 相似文献
52.
53.
Huseyin Zengin Yunus Turen Hayrettin Ahlatci Yavuz Sun 《Journal of Materials Engineering and Performance》2018,27(2):389-397
The effects of La content on the mechanical properties and corrosion behavior of as-cast Mg-Zn-Zr (ZK) magnesium alloys were investigated. The results showed that La addition to ZK60 alloy resulted in a considerable grain refinement and an increase in the volume fraction of second phases by formation of Mg-Zn-La ternary phase. The tensile tests were performed at both room and elevated temperatures. At room temperature, the yield and tensile strengths and elongation-to-fracture significantly increased with 0.2 wt.% La addition, then deteriorated slightly with increasing La additions above 0.2 wt.%. At 200 °C, the yield and tensile strengths continually improved and elongation-to-fracture decreased with increasing La content due to the presence of thermally stable Mg-Zn-La phase. Immersion and electrochemical corrosion tests revealed that the formation of Mg-Zn-La phases led to a higher amount of cathodic sites and preferential corrosion propagation, and thus a decrease in the corrosion resistance of ZK60 alloys. 相似文献
54.
Saricimen Huseyin Kahraman Ramazan Malaibari Zuhair Abdur Rauf Md. 《Protection of Metals and Physical Chemistry of Surfaces》2018,54(5):926-933
Protection of Metals and Physical Chemistry of Surfaces - The objective of this study was to characterize the surfaces of the steel products produced locally during their exposure to the industrial... 相似文献
55.
Electrospun nylon 6,6 nanofibers functionalized with cyclodextrins for removal of toluene vapor
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Functional nylon 6,6 nanofibers incorporating cyclodextrins (CD) were developed via electrospinning. Enhanced thermal stability of the nylon 6,6/CD nanofibers was observed due to interaction between CD and nylon 6,6. X‐ray photoelectron spectroscopy and attenuated total reflectance Fourier transform infrared spectroscopy studies indicated the existence of some CD molecules on the surface of the nanofibers. Electrospun nylon 6,6 nanofibers without having CD were ineffective for entrapment of toluene vapor from the environment, whereas nylon 6,6/CD nanofibrous membranes can effectively entrap toluene vapor from the surrounding by taking advantage of the high surface‐volume ratio of nanofibers with the added advantage of inclusion complexation capability of CD presenting on the nanofiber surface. The modeling studies for formation of inclusion complex between CD and toluene were also performed by using ab initio techniques. Our results suggest that nylon 6,6/CD nanofibrous membranes may have potential to be used as air filters for the removal of organic vapor waste from surroundings. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 41941. 相似文献
56.
Huseyin Cankaya Reyhane Kilci Alphan Sennaroglu Emel Yilgor Iskender Yilgor 《应用聚合物科学杂志》2010,117(1):378-383
Novel, polymeric UV‐to‐visible converters were prepared by doping elastomeric poly(ether‐urethaneurea) copolymers with 5–25% by weight of ErCl3 6H2O, corresponding to Er3+ concentrations of 2.19 to 10.86% by weight. When excited in the UV at 355 nm, the doped films generated a very broad, continuous visible luminescence between 400 and 750 nm. Preparation and spectroscopic characterization of the samples are discussed in detail. The color coordinates, color temperature, color rendering index of the samples, and the degree of overlap of their emission bands with the spectral response of the eye were determined. The color rendering index of samples is in the 57–70 range. The sample containing 2.19% by weight of Er3+ was found to give the color coordinates closest to the white‐source region and the highest color rendering index. The color temperatures of the samples were in the 5093–5540 K range. Overlap between the emission bands and the spectral response of the eye improved with increasing erbium concentration. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
57.
L. M. Aksel’rod S. A. Suvorov V. I. Rumyantsev N. Yu. Korableva A. S. Osmakov Ya. G. Dyatlova I. G. Maryasev S. I. Ivanitsa M. G. Dzhundiet 《Refractories and Industrial Ceramics》2009,50(2):94-97
Technology is developed for manufacturing dispensing nozzles made of zirconium dioxide. Test-industrial batches of objects,
manufactured using separate and combined stabilization of ZrO2, are produced and tested under industrial conditions. Dispensing nozzles differ in open porosity. The service behavior for
the objects developed and imported analogs is compared. The efficiency of using dispensing nozzles made of zirconium dioxide
with porosity less than 12% during operation in a CBCM is demonstrated.
Translated from Novye Ogneupory, No. 4, pp. 73 – 77, April 2009. 相似文献
58.
Aerobic yeasts of the genera Pichia and Williopis are commonly regarded as spoilage yeasts of beer and wine by causing turbidity, a surface film of yeast growth and often an excessive estery flavour. However, their ability to utilise sugars oxidatively for cell growth with the production of estery and other flavours of wine with only minimal production of ethanol suggests a method for the production of low-alcohol wines of pleasant “fermented” flavour without the need for additional equipment to remove alcohol by dialysis, reverse osmosis or distillation, or without the excessive sweetness remaining from arrested fermentation. Three strains of Pichia and one of Williopsis were examined for their ability to produce approximately 3%(v/v) ethanol and a good estery and fruity flavour. With normal anaerobic fermentation conditions, or with gentle stirring to prevent formation of a surface film, excessive amounts of alcohol were produced from grape juice of 15% or 20% (w/v) initial sugar concentration. However, an acceptably flavoured wine of alcohol content < 3% was produced by agitation and aeration during fermentation. The ethanol formed in the early stages of culture was oxidised to a final level < 3%, with the production of cell mass and an acceptable flavour. 相似文献
59.
Huseyin Yavuz 《国际水资源开发杂志》1997,13(4):561-566
In spite of the fact that abundance of water creates problems and sometimes disasters, much of the problem with water lies with its scarcity. Water shortages in a region occur mainly for two reasons. The most important one is associated with climatic conditions, whereas the other has to do with the fact that the location of the water resource does not coincide with where it is needed. This is where engineering and technology come into play along with a handsome amount of capital requirement. As is the case for almost all engineering projects, project economy entails both technical and economic feasibility, which in turn requires that water should be treated as an economic commodity. 相似文献
60.