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《Arabian Journal of Chemistry》2014,7(5):747-751
The copolymer carbazole–phenol formaldehyde doped with 4 (4-hydroxy-phenyl azo)-benzene sulfonic acid (PABS), 2,5-dimethyl benzene sulfonic acid (PXSA) and 4-hydroxy-m-benzene disulfonic acid (PDSA) were prepared. These compounds are identified by FT-IR spectroscopy.The conductivity of copolymer carbazole–phenol formaldehyde doped with 4 (4-hydroxy-phenyl azo)-benzene sulfonic acid (PABS), 2,5-dimethyl benzene sulfonic acid (PXSA) and 4-hydroxy-m-benzene disulfonic acid (PDSA) was studied as a function of weight of the dopant compounds; an increase of conductance of the copolymer by doping with PABS is noted; the conductance became equal to 0.000595 ohm−1 for 0.1 g higher conductance for the copolymer when it is doping with PABS. 相似文献
4.
掺杂剂对聚乙炔中电荷密度波的影响 总被引:2,自引:0,他引:2
用CNDO/2方法研究了各种掺杂剂对聚乙炔中电荷密度波的影响,在掺杂剂附近的碳原子上出现较大的电荷密度,且p型比n型掺杂剂的影响更大,讨论了电荷波与导电性的关系。 相似文献
5.
Simulating the \hbox{BF}_{4}^{-} -doped poly(3-octylthiophene) lattice by molecular dynamics results in a structure in which dopant ions intercalate as a sandwich between thiophene rings on adjacent polymer chains. The ions occupy sites in channels parallel to the polymer main chain, which retains a high degree of planarity in contrast to the pristine (undoped) polymer. Even when lattice imperfections are created by expanding the cell, Coulomb forces ensure that the intercalation features containing the dopant channels are largely retained. On applying electric fields in the principal directions of the 'perfect lattice' it is found that the ions migrate most readily along the ion-channel directions (the lattice c axis), leaving the lattice undisturbed. Although higher electric fields cause dopant migration to occur perpendicular to the channel directions they destroy the intercalated lattice. In the reduced-order lattice regions substantial motion of the ions are predicted at a critical value of the lattice parameter. 相似文献
6.
Boron-doped silicon single crystals of 207 mm diameter with various growing conditions are grown from a large amount of the melt in the cusp-magnetic Czochralski method, and the effects of growing parameters on dopant concentrations in the crystals are experimentally investigated. Equilibrium distribution coefficient of boron calculated by BPS model is 0.716. With the crystal rotation (ω) of 13 rpm and the crucible rotation of , the effective distribution coefficient (ke) is 0.751 in zero magnetic strength and increases up to 0.78 in the magnetic strength of 640 G. For , there is no significant influence of ω on ke. With , ke is almost unity. The experimental results are compared with theory. 相似文献
7.
M. Papanastasiou A.W. McMahon N.S. Allen B.W. Johnson K. Keck-Antoine L. Santos M.G. Neumann 《International journal of mass spectrometry》2008,275(1-3):45-54
The hydrolysis reaction mechanism of phosphite antioxidants is investigated by liquid chromatography-mass spectrometry (LC/MS). The phosphites were chosen because they differed in chemical structure and phosphorus content. Dopant assisted-atmospheric pressure photoionization (DA-APPI) is chosen as the ion source for the ionization of the compounds. In our previous work, DA-APPI was shown to offer an attractive alternative to atmospheric pressure chemical ionization (APCI) since it provided background-ion free mass spectra and higher sensitivity [M. Papanastasiou, et al., Polymer Degradation and Stability 91 (11) (2006) 2675–2682]. In positive ion mode, the molecules are generally detected in their protonated form. In negative ion mode, the phosphites are unstable and only fragment ions are observed; these however, are characteristic of each phosphite and may be used for the identification of the analytes in complex mixtures.The analytes under investigation are exposed to accelerated humid ageing conditions and their hydrolytic pathway and stability is investigated. Different substituents around the phosphorus atom are shown to have a significant effect on the stability of the phosphites, with phenol substituents producing very hydrolytically stable structures. Alkanox P24 and PEP-36 follow a similar hydrolytic pathway via the scission of the first and then the second POphenol bonds, eventually leading to the formation of phenol, phosphorous acid and pentaerythritol as end products. HP-10 exhibits a rather different structure and the products detected suggest scission of either the POhydrocarbon or one of the POphenol bonds. A phenomenon similar to that of autocatalysis is observed for all phosphites and is attributed to the formation of dialkyl phosphites as intermediate products. 相似文献
8.
Guangming Wang Shunhua Chen Qiwei Duan Fenfei Wei Prof. Sen Lin Prof. Zailai Xie 《Angewandte Chemie (International ed. in English)》2023,62(38):e202307470
Borocarbonitride (BCN) materials are newly developed oxidative dehydrogenation catalysts that can efficiently convert alkanes to alkenes. However, BCN materials tend to form bulky B2O3 due to over-oxidation at the high reaction temperature, resulting in significant deactivation. Here, we report a series of super stable BCN nanosheets for the oxidative dehydrogenation of propane (ODHP) reaction. The catalytic performance of the BCN nanosheets can be easily regulated by changing the guanine dosage. The control experiment and structural characterization indicate that the introduction of a suitable amount of carbon could prevent the formation of excessive B2O3 from BCN materials and maintain the 2D skeleton at a high temperature of 520 °C. The best-performing catalyst BCN exhibits 81.9 % selectivity towards olefins with a stable propane conversion of 35.8 %, and the propene productivity reaches 16.2 mmol h−1 g−1, which is much better than hexagonal BN (h-BN) catalysts. Density functional theory calculation results show that the presence of dispersed rather than aggregated carbon atoms can significantly affect the electronic microenvironment of h-BN, thereby boosting the catalytic activity of BCN. 相似文献
9.
掺杂聚苯胺溶致液晶相的产生和表征 总被引:1,自引:0,他引:1
聚苯胺(PAN)具有共轭结构,从理论上满足形成液晶相的基本条件[1,2].但由于聚苯胺难溶、难熔,长期以来对于聚苯胺溶液(尤其是浓溶液)或熔体的研究甚少.近年来,人们采用具有“增塑作用”的大分子功能质子酸对聚苯胺进行掺杂,获得可溶于多种有机溶剂中的掺杂态聚苯胺[3~5].然而,聚苯胺溶液的结构与性能的特点及能否产生溶致液晶相等问题目前尚未见报道.为此,我们研究了十二烷基苯磺酸(DBSA)掺杂聚苯胺在有机溶剂中形成液晶相的条件,探讨了不同掺杂方法对PAN-DBSA的溶解性及形成液晶棺的影响;采用差式扫描量热分… 相似文献
10.
基于器件模拟仿真,设计了一种PNP型1.5 μm 波长多量子阱InGaAsP-InP异质结晶体管激光器材料外延结构,并采用金属有机化学气相沉积外延生长.其中基区采用N型Si掺杂.因为扩散系数小,比较P型Zn搀杂具有较高的稳定性,因而较NPN结构外延材料容易获得高质量的光学有源区.由于N型欧姆接触比P型容易获得,基区搀杂浓度可以相对较低,有利于减小基区光损耗和载流子复合,从而获得较低的阈值电流和较高的输出光功率.所获得的外延材料呈现较高光-荧光谱峰值和65.1 nm较低半峰宽.测试结果显示了较高的外延片光学质量. 相似文献