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41.
Nitrogen implantation has been performed in silicon [001] crystals in carefully controlled alignment conditions. The channeling effects are clearly evident when implanting in [001] and [011] directions at energies ranging from 0.6 to 1.4 MeV. Both ion distribution and damage profiles are strongly influenced by channeling effects during ion implantation. The angular region around the [001] direction has been also investigated by implanting at small angles with respect to the axis. The same kind of study has been performed by implanting at different angles with respect to the planar (011) direction. The ion distributions (investigated by SIMS) show a strong dependence upon the alignment conditions. Moreover in high energy ion implantation, the lattice damage is located deep inside the crystal, leaving the surface layer almost unperturbed. The channeling effects on the damage production have been investigated by double crystal diffraction (DCD) in the low-dose regime and by RBS-channeling experiments (after implantation at doses greater than 1 × 1015 cm–2) and for different ion alignment conditions.A big increase in the ion ranges and a strong reduction in the lattice damage is evident when implanting along major crystal axes. No saturatíon of the lattice damage and of the channelled component of the beam has been detected if the implantation is performed parallel to the [011] axis. 相似文献
42.
聚碳硅烷/纳米镍粉的热裂解 总被引:3,自引:0,他引:3
聚碳硅烷/纳米镍粉的热裂解王军*宋永才冯春祥(国防科学技术大学材料工程与应用化学系长沙410073)关键词聚碳硅烷,纳米材料,镍,热解,碳化硅纤维1996-09-17收稿,1996-12-13修回国家攻关计划和“863”高技术资助项目聚碳硅烷(PCS... 相似文献
43.
本文研究了以玻碳电极为基体的1:12硅钼杂多酸根(SiMo_(12)O_(40)~(4-)简称12-MSA)修饰电极的制备及其电化学行为,将12-MSA电极应用于线性扫描伏安法测定天然水中可溶性硅酸盐,结果满意.硅浓度在8.0×10~(-7)~1.7×10~(-3)mol/L,相对标准偏差(n=7)为1.85%,加标回收率为98.2%~103.6%,SiMo_(12)电极具有优良的选择性和稳定性。 相似文献
44.
45.
The results of NMR-spectroscopy studies of the structure, dynamic stereochemistry, and intermolecular interactions in solutions
of organic derivatives of penta-and hexacoordinated silicon, germanium, and tin containing amidomethyl, lactamomethyl, and
related bidentate ligands are surveyed.
For the series of works “Dynamic stereochemistry of hypervalent compounds of silicon, germanium, and tin,” the author was
awarded the Academia Europea Prize for young scientists from CIS in 1996.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 1912–1934. November, 1997. 相似文献
46.
采用溶胶凝胶法,以蔗糖和正硅酸乙酯(TEOS)为原料,草酸为TEOS水解的催化剂,制备均相碳化硅前驱体,在氩气氛和高温条件下(1 350~1 600 ℃)将碳化硅先驱体进行碳热还原,制备出高比表面积的SiC。考察了水/TEOS物质的量的比、碳/硅物质的量的比及镍盐等因素对碳化硅比表面积的影响。结果表明,当nwater/nTEOS=7.5,nC/nSi=4时,适宜的镍催化剂(nNi/nTEOS=0.005),凝胶形成的时间最短,镍盐的加入可使碳热还原温度降低200 ℃。 相似文献
47.
By use of salt elimination, the transition metal substituted oligosilanes (η5-C5Me4Et)Fe(CO)2SiMe2SiMe2Cl 1, (η5-C5Me4Et)Mo(CO)3SiMe2SiMe2Br 2, (η5-C5Me4Et)Fe(CO)2(SiMe2)6(CO)2Fe(η5-C5Me4Et) 3 and (η5-C5Me4Et)Fe(CO)2(SiMe2)6Br 4 were prepared and characterized. Compound 1 is well crystallized from pentane and its structure has been determined by X-ray diffraction analysis. 相似文献
48.
Masahiro Murayama Ryoji Kanno Michihiko IrieShinya Ito Takayuki HataNoriyuki Sonoyama Yoji Kawamoto 《Journal of solid state chemistry》2002,168(1):140-148
The new lithium ionic conductors, thio-LISICON (LIthium SuperIonic CONductor), were found in the ternary Li2S-SiS2-Al2S3 and Li2S-SiS2-P2S5 systems. Their structures of new materials, Li4+xSi1−xAlxS4 and Li4−xSi1−xPxS4 were determined by X-ray Rietveld analysis, and the electric and electrochemical properties were studied by electronic conductivity, ac conductivity and cyclic voltammogram measurements. The structure of the host material, Li4SiS4 is related to the γ-Li3PO4-type structure, and when the Li+ interstitials or Li+ vacancies were created by the partial substitutions of Al3+ or P5+ for Si4+, large increases in conductivity occur. The solid solution member x=0.6 in Li4−xSi1−xPxS4 showed high conductivity of 6.4×10-4 S cm−1 at 27°C with negligible electronic conductivity. The new solid solution, Li4−xSi1−xPxS4, also has high electrochemical stability up to ∼5 V vs Li at room temperature. All-solid-state lithium cells were investigated using the Li3.4Si0.4P0.6S4 electrolyte, LiCoO2 cathode and In anode. 相似文献
49.
G. A. Gavrilova M. G. Voronkov N. N. Chipanina L. I. Gubanova O. M. Trofimova Yu. L. Frolov 《Russian Chemical Bulletin》1995,44(4):667-669
The IR spectra of solutions of (=OSi)-(benzoyloxymethyl)trifluorosilane (1),-(benzoyloxymethyl)methyldifluorosilane (2), and butyl benzoate (3) are examined in the region of thev(C=O) stretching vibrations in 24 solvents. The ability of compounds1—3 to undergo specific intermolecular interactions is evaluated from the dependence ofv(C=O) on the Kamlet-Taft (*,, ) parameters, which was obtained for the carbonyl groups involved in the intramolecular coordinate (=OSi) bond and for free carbonyl groups. The corresponding values of the coefficients in the Kamlet-Taft equations are indicative of a weak ability of pentacoordinate silicon compounds1 and2 to undergo acid-base interactions.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 689–692, April, 1995. 相似文献
50.
p—Si上电沉积Ni—W—P薄膜的结构与热稳定性 总被引:3,自引:0,他引:3
研究了p-Si上恒电流沉积Ni-W-P合金薄膜组成与结构的关系,讨论了镀层的组成、结构随沉积时间的变化.测定了非晶合金的晶体结构随热处理温度的改变以及DTA曲线,结果表明,非晶Ni-W-P合金在晶化过程中形成两个纳米超微晶相,非晶Ni-W-P薄膜的热稳定性远高于通常使用的非晶Ni-P薄膜. 相似文献