全文获取类型
收费全文 | 92篇 |
免费 | 5篇 |
国内免费 | 37篇 |
专业分类
化学 | 105篇 |
综合类 | 1篇 |
数学 | 1篇 |
物理学 | 27篇 |
出版年
2023年 | 2篇 |
2020年 | 1篇 |
2018年 | 3篇 |
2017年 | 8篇 |
2016年 | 4篇 |
2015年 | 5篇 |
2014年 | 11篇 |
2013年 | 11篇 |
2012年 | 9篇 |
2011年 | 13篇 |
2010年 | 13篇 |
2009年 | 12篇 |
2008年 | 4篇 |
2007年 | 6篇 |
2006年 | 3篇 |
2005年 | 5篇 |
2004年 | 1篇 |
2002年 | 2篇 |
2001年 | 4篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 4篇 |
1995年 | 1篇 |
1991年 | 4篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1987年 | 4篇 |
排序方式: 共有134条查询结果,搜索用时 15 毫秒
21.
Visible light variable optical attenuators(VOA) are essential devices in the application of channel power regulation and equalization in wavelength-division multiplexing cross-connect nodes in plastic optical fiber(POF) transmission systems.In this paper, a polymer/silica hybrid waveguide thermo–optic attenuator based on multimode interference(MMI) coupler is designed and fabricated to operate at 650 nm. The single-mode transmission condition, MMI coupler, and transition taper dimensions are optimized through the beam propagation method. Thermal analysis based on material properties provides the optimized heater placement angle. The fabricated VOA presents an attenuation of 26.5 dB with a 21-mW electrical input power at 650 nm. The rise time and fall time are 51.99 and 192 μs, respectively. The time–stability measurement results prove its working reliability. 相似文献
22.
以姜黄素和碘甲烷为原料,一步合成了二甲基姜黄素分子探针L,其结构经X-射线单晶衍射、~1H NMR,~(13)C NMR和ESI-MS等分析手段确证。该化合物晶体属单斜晶系,空间群C2/c,晶胞参数:a=22.317(6)nm,b=8.703 8(19)nm,c=23.039(5)nm,β=93.378(10)°,V=4 467.4(18)nm3,Z=4,Dc=1.206 g·cm-3,F(000)=1 720,μ(MoKα)=0.088 mm-1,R=0.080 9,ωR=0.216 3。探针L在甲醇-水溶液(体积比9∶1,Tris-HCl缓冲溶液,p H 7.2)中对Fe~(3+)具有选择性识别和较强的抗干扰能力。通过紫外滴定以及质谱确证探针L与Fe~(3+)形成1∶1配合物,结合常数(K)为1.089×106L/mol。该识别体系在Fe~(3+)浓度为5.5×10-6~3×10~(-5)mol/L范围内具有较好的线性关系(r2=0.997 8),检出限为2.2×10~(-6)mol/L。 相似文献
23.
The title compound 3,9-bis(pyridin-2-yl)-2,4,8,10-tetraoxaspiro[5.5]undecane 4(C17H18N2O4) has been synthesized by the reaction of 2,2-bis(hydroxymethyl)propane-1,3-diol with pyridine-2-carbaldehyde in the presence of p-toluenesulfonic acid,and characterized by IR,1H-NMR and X-ray single-crystal diffraction.The crystal belongs to monoclinic system,space group C2/c with a = 25.133(2),b = 5.7219(5),c = 21.942(2) ,β = 99.145(2)°,V = 3115.3(5)3,Z = 8,Dc = 1.340 g/cm3,Mr = 314.33,F(000) = 1328,μ = 0.097 mm-1,MoKa radiation(λ = 0.71073),R = 0.0352 and wR = 0.1022 for 2486 observed reflections with I > 2σ(I).X-ray analysis reveals that the two 1,3-dioxane rings passing through the central spiro-C atom both adopt chair conformation.Intermolecular C-H…π,C-H…O and C-H…N weak interactions link the molecules to form a three-dimensional samdwich,which are effective in the stabilization of the crystal structure. 相似文献
24.
感应耦合等离子体刻蚀在聚合物光波导制作中的应用 总被引:1,自引:0,他引:1
提出了利用感应耦合等离子体(ICP)刻蚀技术提高聚合物光波导器件性能的方法,介绍了ICP刻蚀技术的原理和优点。选取聚甲基丙烯酸甲酯-甲基丙烯酸环氧丙酯(P(MMA-GMA))作为波导材料,采用氧气作为刻蚀气体,研究了ICP参数变化对刻蚀效果的影响。介绍了倒脊形光波导的制备过程,采用改变单一工艺参数的方法,分析了刻蚀效果随时间、功率、压强、气体流量等参数的变化,对参数优化后刻蚀得到的凹槽和平板结构进行了表征。实验结果表明:在天线射频功率为300 W,偏置射频功率为30 W,气体压强为0.5 Pa,氧气流速为50 cm3/min的条件下,可获得侧壁陡直、底面平整的P(MMA-GMA)凹槽结构。 相似文献
25.
26.
27.
28.
A novel molecule tetra-N-alkylation of cyclen (1,4,7,10-tetraazacyclododecane), 1,4,7,10-tetrakis(2-((4-hydroxy)phenoxy)ethyl)-1,4,7,10-tetraazacyclododecane 2, was synthesized and structurally characterized by single-crystal X-ray diffraction. The molecule turned into chiral helical compound crystals grown from EtOH by slow diffusion at room temperature and three of the four hydroquinone groups of the benzene ring formed a g-electron-rich cavity by C-H…π stacking interaction. The crystal belongs to the monoclinic system, space group P21/C with a = 13.9192(9), b = 13.2871(6), c = 22.1894(15)A^°, β = 91.4600(10)°, V = 4102.5(4)A^°3, Z = 4, Dc = 1.219 g/cm^3, C40H52N4O8, Mr = 752.89, F(000) = 1616,μ = 0.088 mm^-1, MoKa radiation (λ = 0.71073), R = 0.0578 and wR = 0.1389 for 5588 observed reflections with I 〉 2σ(I). Moreover, compound 2 was characterized with ^1H NMR, ^13C NMR, IR spectra and MS. 相似文献
29.
30.