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排序方式: 共有2776条查询结果,搜索用时 15 毫秒
81.
Yuki Tanaka Takumi Sako Tatsuhiro Hiraoka Misaki Yamaguchi Masayuki Yamaguchi 《应用聚合物科学杂志》2020,137(46):49516
The structure and rheological properties of binary blends of polycarbonate (PC) and polystyrene (PS) were investigated using various PS samples with different molecular weights, namely PS1k (Mw = 1,000), PS53k (Mw = 53,000), and PS240k (Mw = 240,000). The blends with PS53k and PS240k show phase-separated structures, whereas the blend with PS1k is miscible. The shear viscosity decreases greatly on addition of PS53k and PS240k, especially at high shear rates, which would be a great advantage at processing operations. Because the nonlinear response occurs in the small strain region for multilayered films of PC and PS240k, the origin of the significant viscosity drop for the phase-separated system is interfacial slippage at the phase boundary. 相似文献
82.
Apichaya Jianprasert Pathavuth Monvisade Masayuki Yamaguchi 《Journal of Coatings Technology and Research》2016,13(2):345-354
A novel coating material on paperboard and fiberboard from poly(vinyl alcohol) (PVA) modified with Tung oil was developed. The PVA/Tung oil coating was cured at several conditions: 25, 40, 50, and 60°C, in the presence of two types of catalysts, i.e., thermal catalyst using potassium persulfate (KPS) and redox catalyst using KPS and sodium thiosulfate. The chemical crosslinked structure of PVA/Tung oil-coating films was confirmed by FTIR. The result indicated the decrease in the double bonds of Tung oil by crosslinking reaction, especially at 60°C. In comparison with the same curing temperature, the films with redox catalyst showed more reduction in the number of double bonds of Tung oil. DMA results of the PVA/Tung oil-coating materials with redox catalyst showed the lowering of the heights of both β transition peak of Tung oil and α transition peak of PVA. FTIR and DMA results confirmed the more efficient crosslinking reaction of redox catalytic system than that of the thermal catalytic system. The water resistance and mechanical properties of these coating materials exhibited better values as projected to higher curing temperature and redox catalyst. SEM images showed the smooth surface of PVA/Tung oil covered on the paperboards with ~72 µm in thickness. The contact angle of water or oil drop and dynamic change in contact angle on the surfaces of PVA/Tung oil-coated paperboards and fiberboards were investigated. The results show the contact angles for both water and oil were lower than those of the uncoated ones, indicating the improvement of water and oil affinities of the PVA/Tung oil-coating materials. The dynamic changes in contact angle of the coated ones also decreased, suggesting the reduction in water and oil absorption rates of these coated substrates. 相似文献
83.
An efficient and compact catalytic membrane reactor for reforming of CH4 was developed by integrating a hydrogen perm-selective silica membrane with an Rh/-Al2O3 catalyst layer. The catalytic layer was sandwiched between the outer surface of the -Al2O3 support tube and the silica membrane with an aim of improving the heat and mass transfer rates through the system and to simplify the reactor geometry. The system showed improved efficiency for reforming of CH4 at comparatively lower operating temperatures and steam to C molar ratios than the conventional fixed-bed steam reforming systems. Under optimized conditions, a nearly 25-30% improvement from the equilibrium conversion level was achieved as a result of abstraction of hydrogen from the product stream by the silica membrane integrated with the catalyst layer. The performance of the system was evaluated as a function of various process parameters. Because of the compactness and efficiency, the present system emerges as a promising alternative to the conventional membrane reactors, which possess separate catalytic and membrane units. 相似文献
84.
Toshiyuki Yamaguchi Yasutaka AsaiNaoyuki Oku Shigetoshi NiiyamaToshito Imanishi Shigeyuki Nakamura 《Solar Energy Materials & Solar Cells》2011,95(1):274-276
Cu(In,Ga)(S,Se)2 thin films with high Ga/III ratio (around 0.8) were prepared by sequential evaporation from CuGaSe2, CuInSe2, In2Se3 and Ga2Se3 compounds and then annealing in H2S gas atmosphere. The annealing temperature was varied from 400 to 500 °C. These samples were characterized by means of XRF, EPMA, XRD and SEM. The S/(S+Se) mole ratio in the thin films increased with increase in the annealing temperature, keeping the Cu, In and Ga contents nearly constant. The open circuit voltage increased and the short circuit current density decreased with increase in the annealing temperature. The best solar cell using Cu(In,Ga)(S,Se)2 thin film with Ga/(In+Ga)=0.79 and S/(S+Se)=0.11 annealed at 400 °C demonstrated Voc=535 mV, Isc=13.3 mA/cm2, FF=0.61 and efficiency=4.34% without AR-coating. 相似文献
85.
Tamotsu Tanaka Kouji Ikita Tetsuji Ashida Yoshiaki Motoyama Yasunori Yamaguchi Kiyoshi Satouchi 《Lipids》1996,31(11):1173-1178
The effects of growth temperature on the fatty acid compositions of the phosphatidylcholine (PC), phosphatidylethanolamine
(PE), and total lipid (TL) fractions of the free-living nematodeCaenorhabditis elegans were investigated. A reduction in growth temperature from 25 to 15°C caused the proportions of eicosapentaenoic acid (20∶5n-3)
to increase from 23.6 to 32.5% in the PC, from 7.4 to 10.8% in the PE, and from 12.9 to 19.9% in the TL fractions. Conversely,
the levels of dihomo-γ-linolenic acid (20∶3n-6) and arachidonic acid (20∶4n-6) in these phospholipid fractions and the TL
fraction both decreased with decreasing growth temperature. Analysis of the positional distribution of fatty acids in the
PC fraction revealed that the change in the composition of C20 polyunsaturated fatty acid was obvious in positionsn-2. Lowering the growth temperature induced an increase in the level of the diacyl subclass of PE from 58% at 25°C to 71%
at 15°C, with a concomitant decrease in the levels of the alkylacyl and alkenylacyl subclass of PE ofC. elegans. These changes observed in the phospholipids ofC. elegans might be one mechanism for adaptation to low temperature. Lipids 31, 1173–1178 (1996). 相似文献
86.
Imaging of optical disc using reflection-mode scattering-type scanning near-field optical microscopy
Yamaguchi M Sasaki Y Sasaki H Konada T Horikawa Y Ebina A Umezawa T Horiguchi T 《Journal of microscopy》1999,194(PT 2-3):552-557
A phase-change optical disc was observed using a reflection-mode scattering-type scanning near-field optical microscope (RS-SNOM). In an a.c.-mode SNOM image, the 1.2 microm x 0.6 microm recording marks were successfully observed although the data were recorded on the groove. In contrast, no recording marks could be resolved in a d.c.-mode SNOM image. These results are in good agreement with those from a numerical simulation using the finite difference time domain method. The resolution was better than 100 nm with a.c.-mode SNOM operation and the results indicate that recording marks in phase-change optical media can be directly observed with the RS-SNOM. 相似文献
87.
Theasaponin E1 destroys the salt tolerance of yeasts 总被引:1,自引:0,他引:1
Tomita M Yamamoto S Yamaguchi K Ohigashi H Yagi T Kohata K Berden JA 《Journal of Bioscience and Bioengineering》2000,90(6):637-642
Cells of Zygosaccharomyces rouxii in a medium containing a high concentration of NaCl were killed during incubation for 2-4 h with a low concentration of a mixture of saponins from tea seeds (TSS). The higher the concentration of NaCl in the medium, the higher the inhibitory effect of TSS on the growth of the yeast. The above inhibitory effect of TSS on the growth of the yeast was not observed when cells were incubated in hypertonic media composed of nonionic substances such as sugars. The ATPase activity of plasma membrane preparations from the yeast cells was slightly affected by the addition of TSS. It is shown that TSS facilitates leakage of glycerol from the yeast cells under NaCl-hypertonic conditions. The major inhibitor in the mixture of saponins was isolated and identified as theasaponin E1. Its isomer, theasaponin E2, did not have any effect on the salt tolerance of Z. rouxii or Saccharomyces cerevisiae. 相似文献
88.
Processability at extrusion coating and mechanical properties of the films obtained are investigated by means of linear and nonlinear rheological measurements and tensile tests for blends of polypropylene (PP) and linear low‐density polyethylene (LLDPE). Both materials are produced by metallocene catalyst. The processability of PP is found to be improved by the addition of LLDPE; the blend shows low level of motor torque and head pressure in an extruder and small level of neck‐in as compared with pure PP. Further, the anisotropy of ultimate tensile strength, which is prominent for PP, is reduced by blending with LLDPE. As a result, the blend having 20 wt % of LLDPE shows appropriate properties in the molten state for extrusion coating and in the solid state as a film. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
89.
毛细管电泳仪具有灵敏度高、分析速度快等优势,为降低其生产成本,基于电泳原理,以荧光显微镜为基础,设计了一套毛细管电泳系统。以20 bp(base pairs,碱基对)DNA ladder和100 bp DNA ladder为样本,全面分析了系统的稳定性、灵敏度和分离效果。结果表明:该系统在9 min内可以实现1500 bp以内DNA片段的高效分离,系统检测极限为0.1 ng/μL;在优化的电泳条件下,对限制性内切酶φX174-HincⅡ作用过的λ-DNA片段5 min内实现了291 bp与297 bp DNA片段的区分。 相似文献
90.
Hot-rolling workability, texture and grain boundary character distribution of B2-type FeAl, NiAl and CoTi intermetallic compounds were investigated as a function of alloy stoichiometry. All the FeAl (i.e., Fe-38Al, -43Al and -48Al, denoted by at.%), and stoichiometric NiAl and CoTi were successfully hot-rolled at 1273 K but off-stoichiometric NiAl (Ni-48Al and -52Al) and CoTi (Co-48Ti and -49Ti) failed. After hot-rolling, all the FeAl showed microstructures with recrystallized coarse grains while (stoichiometric) CoTi retained a deformed microstructure. Hot-rolled (stoichiometric) NiAl showed an intermediate microstructure between FeAl and CoTi. The hot-rolling and annealing textures of FeAl essentially consisted of {111}u v w. For NiAl and CoTi, {111}110 and {111}112 were prominent in the hot-rolling texture, respectively. Both the hot-rolled NiAl and CoTi showed fully-recrystallized microstructures by subsequent annealing, but the resultant recrystallization textures were similar to their hot-rolling textures. On the other hand, grain boundary character distributions of FeAl, NiAl and CoTi with fully-recrystallized microstructures were similar to one another and characterized by a high frequency of low angle boundaries (i.e. 1 boundaries). Based on these results, recrystallization and grain boundary structure of the B2-type ordered intermetallic compounds were briefly discussed. 相似文献