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151.
Isamu Namiki 《应用聚合物科学杂志》1976,20(7):1933-1939
By measuring moisture permeability constants of printed circuit adhesive films having different solder dip resistances, a study was made of the relation between moisture permeability and solder dip resistances. Comparisons of poly(vinylbutyral) (I)–phenolic resin with I–epoxy resin, I–phenolic resin with poly(vinyl acetate)–phenolic resin, I–phenolic resin with poly(vinylformal)–phenolic resin and study of the effect of hydroxyl group content of I show that adhesive films of good solder dip resistance have small moisture permeability. The solder dip resistance depends markedly on the mole ratio of formaldehyde–phenol in the phenolic resin, while the moisture permeability is almost independent of the ratio. 相似文献
152.
Isamu Namiki 《应用聚合物科学杂志》1976,20(3):799-807
Phenolic resins were synthesized by using various kinds and amounts of catalyst and changing the mole ration of formaldehyde and phenol. The solder dip resistance and the peel strength were measured for two-component printed circuit adhesives mixed with poly(vinyl acetal) resin, and the relation between these properties and the molecular structure of the phenolic resins were studied. Catalysts such as ammonia, amines having low boiling points, and alkaline earth metal oxide and hydroxides give resins with good properties. When the mole ratios of ammonia to phenol and formaldehyde to phenol are respectively 0.05–0.10 and 1.5, the resins obtained have good characteristics. The solder dip resistance is improved by aging the resin solution at moderate temperature. 相似文献
153.
The relationships between mechanical properties and superstructure of nylon-6 fibre prepared by a new annealing method, called the zone-annealing method, were investigated in comparison with three other annealing methods, namely, annealing under release, annealing at constant length, and annealing under tension. It was found that the very high modulus and strength of the zone-annealed fibre were directly attributed to the large number of tie molecules connecting the crystallites and to the high orientation of the amorphous chains. 相似文献
154.
The UNIFAC model, developed for binary systems alkanes with n-alcohols, ketones, esters and ethers, and for ternary n-alcohol—n-alcohol—n-alkane systems, gives satisfactory predictions of excess enthalpies of mixing for the systems studied. 相似文献
155.
156.
Electronic transport properties of a bundle of Si nanochains/nanowires were investigated. Si nanochains and nanowires were grown via a self-organized vapor-liquid-solid process and located on a pair of electrodes with a gap of several hundred nanometers. Unstable and a variety of current-voltage (I-V) characteristics were observed and some of those were Coulomb staircase-like. In addition, fluctuations which were seemingly random but partly and partially reproducible were observed in I-V curves of a parallel junction of a nanochain and a nanowire. 相似文献
157.
158.
Akiba I Seki T Mori M Iizuka M Nishimura S Sasaki S Imoto K Barsoumian EL 《Receptors & channels》2003,9(5):291-299
Nociceptive transduction in inflammatory and neuropathic pain involves peripherally expressed voltage-gated sodium channels, such as tetrodotoxin (TTX)-sensitive PN1 and TTX-resistant PN3. We generated recombinant cell lines stably expressing the human PN1 and PN3 sodium channels in Chinese hamster ovary (CHO) cells using inducible expression vectors. The PN1 and PN3 cDNAs were isolated from human adrenal gland and heart poly(A)+ RNAs, respectively. The recombinant human PN1 currents exhibited rapid activation and inactivation kinetics and were blocked by TTX with a half-maximal inhibitory concentration (IC50) of 32.6 nM. The human PN3 channel expressed in stable transfectants showed TTX-resistant inward currents with slow inactivation kinetics. The IC50 value for TTX was 73.3 microM. The voltage-dependence of activation of the PN3 channel was shifted to the depolarizing direction, compared to that of the PN1 channel. Lidocaine and mexiletine exhibited tonic and use-dependent block of PN1 and PN3 channels. The PN1 channel was more susceptible to inhibition by mexiletine than PN3. These results suggest that stable transfectants expressing the human PN1 and PN3 sodium channels will be useful tools to define subtype selectivity for sodium channel blockers. 相似文献
159.
Seiichi Kawahara Asangi Gannoruwa Ken Nakajima Xiaobin Liang Isamu Akiba Yoshimasa Yamamoto 《Advanced functional materials》2020,30(15)
Nanodiamond glass is an amorphous solid consisting of nanodiamond as a nanoparticle. The several‐nm‐space between the nanodiamonds is filled with a medium that reversibly deforms and recovers. Hence, nanodiamonds linked in the medium are arranged in several‐nm intervals. To prepare the nanodiamond glass, nanodiamonds are dispersed as inorganic nanoparticles with highly reactive functional groups into natural rubber as an incompressible medium exhibiting reversible deformation and recovery. Nanodiamond glass can be distinguished from nanodiamond‐filled rubber, which exhibits ordinary entropic elasticity. Natural rubber particles dispersed in water (i.e., latex) are used to prepare nanodiamond glass, chemically embed nanodiamonds onto the surface of the natural rubber particles, and subsequently attach the surfaces together to achieve close packing of the nanodiamonds. Increasing the modulus of natural rubber constrained in the nanospaces ensures the energetic elasticity of nanodiamond glass. This work demonstrates that nanodiamond glass with energetic elasticity is a new research field. 相似文献
160.
Zhi Chao Shinshi Tadahiko Uehara Minoru Matsutani Akihiro Yuito Isamu Takeuchi Teruaki 《Microsystem Technologies》2015,21(3):675-681
Microsystem Technologies - In this paper we propose a MEMS fabrication process that enables a polydimethylsiloxane (PDMS) diaphragm to be integrated with a sputtered thin film permanent magnet... 相似文献