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81.
采用热分解法制备钛基IrSnOx电极,并将电极应用于电催化氧化对二氯苯制备2,5-二氯苯酚,探索了绿色高效的电合成途径. 结果表明,电极表面存在裂纹,中间层Sn:Sb为94:6时裂纹较少,强化寿命较长;电极对对二氯苯电氧化具有较好的循环伏安响应;IrSnOx电极电催化氧化对二氯苯所得产物主要为2,5-二氯苯酚、1,2,4-三氯苯、对氯苯酚等,其中2,5-二氯苯酚选择性达93%,产率57%,显著优于以析氯电极、析氧电极、铂为阳极时,2,5-二氯苯酚的选择性89%、27%、87%和30%、15%、49%的产率,体现了优良的电催化氧化性能. 相似文献
82.
Tingjun Zhong Richard J. Mandle John W. Goodby Lanying Zhang Cuihong Zhang 《先进技术聚合物》2019,30(11):2781-2789
In this work, the thiol‐ene click reaction is employed to fabricate polymer‐dispersed liquid crystal (PDLC) films by photoinitiated polymerization. The PDLC films are prepared by systematic variation of key conditions: variety and content of ‐ene monomer, liquid crystal (LC) content, curing time, and curing light intensity. We find that both the morphologies and electro‐optic properties of these films are adjustable. When increasing the length of alkyl main chain of ‐ene monomers, the driving voltages reduce, but in turn, the contrast ratio decreases. Increasing ‐ene monomer content raises the driving voltages as well as the response time, and the increase of LC content lowers the driving voltages but has a negative effect on the contrast ratio. The changes to the curing conditions (both curing time and UV light intensity) can be used to modify the driving voltages, response time, and contrast ratios of PDLC films. These comparative studies will elucidate new insights in commercial applications of intelligent PDLC films. 相似文献
83.
直线电机是一种无需中间传动装置而直接将电磁力转换为线性运动的特种电机,在交通运输领域具有广泛的应用前景.将高温超导技术与电机理论相结合,能够有效利用超导材料的强载流能力与高场特性提高直线电机的输出能力.本文提出了一种应用于超导磁悬浮列车牵引的空芯高温超导直线电机,首先建立空芯高温超导直线电机的二维有限元模型对电机结构参数进行初步探索,并完成了超导直线电机样机的设计与制作.通过搭建实验测试平台完成了空芯高温超导直线电机定子磁场和电磁力的实验测试.有限元计算结果与实验数据有较好的一致性,验证了模型的有效性,并利用该模型研究了定子电流,超导线圈电流以及电机气隙对电机推进力输出的影响.本文的相关成果将促进超高速磁浮交通领域关键驱动技术的研究与发展. 相似文献
84.
纳米孔单分子检测技术以其简便、快速、高通量及无需标记等特点, 应用于DNA及蛋白质测序, 更有望实现单分子动态构象变化的研究. Aerolysin(气单胞菌溶素)纳米孔道由于其特有的较长的β-桶限域区(β-barrel)及孔内壁丰富的带电荷氨基酸残基, 在单个寡聚核苷酸分子分析中展现出极高的灵敏性. 本设计利用dA14-4-X, dA14-11-X, dA14-4-X-11-X (X=C, T, G)等单个寡聚核苷酸探针分子, 研究了Aerolysin的两个灵敏区域R1和R2, 探索了R1灵敏区域对单个碱基弱相互作用的差异, 实现区分单个碱基差异. 进一步实验证明, R1灵敏区域对单个碱基类型差异的灵敏区分不受R2灵敏区域被碱基A、C、T占位所影响. 然而, 当R2区域被碱基G占位时, 会使R1区域丧失对整个孔道电流的主导性. 本研究有助于理解Aerolysin对单个寡聚核苷酸分子的超灵敏测量机制. 相似文献
85.
86.
《中国化学》2017,35(9):1405-1410
Pd and Pdx Ni nanoparticles have been supported on reduced graphene oxide (Pd/rGO and Pdx Ni/rGO ) by using the microwave‐assisted heating method in glycol. The morphology, composition and electrochemical performance have been characterized by TEM , XRD , XPS and electrochemical methods. The XRD and XPS results show that there are no PdNi alloy particles formed in Pdx Ni/rGO and the composites exist mostly in the form of Pd0 and NiOOH species. The electrochemical results reveal that Pdx Ni/rGO synthesized from the feeding source of Pd and Ni with an atomic ratio of 4∶1 exhibits higher activity, better stability and smaller electron transfer resistance toward formic acid electro‐oxidation compared with commercial Pd/C, Pd/rGO and other Pdx Ni/rGO samples. The excellent electrocatalytic performance indicates that the addition of appropriate amount of Ni can greatly enhance the activity and stability of Pd catalysts for formic acid oxidation. 相似文献
87.
88.
89.
F. J. Luque J. M. López-Bes J. Cemeli M. Aroztegui M. Orozco 《Theoretical chemistry accounts》1997,96(2):105-113
. High-level ab initio quantum mechanical methods have been used to analyze the tautomeric preferences in the gas phase and in aqueous solution
of three important five-member heterocycles: 4-(5-)methylimidazole, 5-hydroxyisoxazole, and 3-hydroxypyrazole. Solvent effects
have been introduced by means of self-consistent reaction field (SCRF) calculations at the ab initio level using our parametrized version of the polarizable continuum model developed by Miertus, Scrocco and Tomasi (MST), including
geometry relaxation upon solvation. The extent to which the MST model, and SCRF methods in general, are suitable for the study
of processes of this type is discussed. 相似文献
90.
P. Sen Joyee Ghosh Alqudami Abdullah Prashant Kumar Vandana 《Journal of Chemical Sciences》2003,115(5-6):499-508
We describe a novel process for the production of nanoparticles of Cu, Ag, Fe and Al which involves exploding their respective
wires, triggered by large current densities in the wires. The particles are characterised by X-ray diffraction (XRD) and atomic
force microscopy (AFM). Particle sizes in the range 20–100nm were obtained employing this technique. The XRD results reveal
that the nanoparticles continue to retain lattice periodicity at reduced particle sizes, displaying in some cases evidence
of lattice strain and preferential orientation. In the case of Fe, Mossbauer spectroscopy reveals loss of ferromagnetism as
a result of the reduced size of the particles.
Dedicated to Professor C N R Rao on his 70th birthday 相似文献