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91.
该系统是基于高频宽带运放OPA695和可控增益放大器LMH6502组合而成的射频宽带放大器,可实现0~60 d B连续可调。由于O PA695是一款具有超低输入噪声电压信号的电流型运放,所以将其作为前级放大。LMH6502作为第二级放大电路可通过DA控制其增益大小,变化范围为-40~20 d B。最后一级经OPA695进行信号的总体放大,使其总增益可达到60 d B以上。调零电路使整个放大器最大程度的减小了直流偏移,并通过减小电源纹波和使用屏蔽线等方法将噪声减小到最小。同时,放大器增益可预设,并可将增益同步显示在LCD上。 相似文献
92.
93.
采用EDTA-柠檬酸盐法制备了(Pr0.9La0.1)2(Ni0.74Cu0.21Ga0.05)O4+δ(PLNCG),并与Ce0.9Gd0.1O2-δ(CGO)形成复合阴极PLNCG-CGO。XRD和SEM分析结果表明PLNCG与CGO在1 000℃具有较好的化学相容性。电化学阻抗测试结果表明PLNCG-30% CGO复合阴极在700℃的极化电阻为0.092 Ω·cm2;过电位为39.3 mV时,电流密度达到113.3 mA·cm-2。氧分压分析表明电极反应的速率控制步骤为电荷转移过程。阳极支撑单电池(Ni-CGO/CGO/PLNCG-30% CGO)在700℃的最大输出功率密度达到569 mW·cm-2,开路电压(OCV)为0.76 V。综上结果预示PLNCG-30% CGO复合阴极是一种有发展前景的电极材料。 相似文献
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95.
αB‐crystalin, a small heat shock protein and a component of α‐crystalin, is a molecular chaperone playing an important role in preventing the formation of cataracts. It has been reported that His18 is an important site for Cu2+ to bind with to form a stable metal complex and thus to enhance this chaperone‐like activity of human αB‐crystalin. In this work, we used site‐directed mutagenesis to clone and express H18G rat lens αB‐crystalin in order to investigate the role of His18 in chaperoning activity. We found that 1 mM of Cu2+, or Zn2+, rather than Mg2+, significantly enhanced the chaperone‐like activity of wild type αB‐crystalin. Whereas, it is Zn2+ and Mg2+, not Cu2+, that significantly reduced this activity of H18G αB‐crystalin. In the absence of cation, H18G showed better activity compared to the wild type αB‐crystalin. ANS fluorescence measurement showed there was no linear relationship between chaperone‐like activity and surface hydrophobicity, indicating that surface hydrophobicity is not a prerequisite for chaperone‐like activity. An HPLC size‐exclusion chromatography study showed that in the presence of metal ions, wild type αB‐crystalin tended to aggregate via dissociation and re‐association into a high molecular aggregate with a molecular weight higher than 1400 kDa and then precipitated, suggesting that the presence of metal ions is a factor leading to the formation of cataracts. Both the near and far UV‐CD spectra suggested that the wild type αB‐crystalin reflected more β‐sheet structural characteristics; whereas the H18G reflected more random coil characteristics. The H18G induced structural alterations as to develop more random coil characteristics and more micro‐environmental changes around the tryptophan residues. This work suggested that His18 may not be a crucial binding site for Cu2+, but rather that it may be an important binding site for Zn2+ in terms of chaperone‐like activity and the process of metal induced self‐aggregation is prerequisite for chaperone‐like activity to occur. 相似文献
96.
A novel, convenient, efficient, three‐step, one‐pot synthesis of 2‐oxazolidinones from phenyl 2‐hydroxyalkyl selenides was developed. Using this methodology, 2‐oxazolidinones are obtained in good yields (76–85%) by reaction of phenyl 2‐hydroxyalkyl selenides with benzoyl isocyanate and subsequent oxidation/cyclization, followed by hydrolysis with hydrochloric acid solution. 相似文献
97.
A general and practical one‐pot synthesis of naphthopyran derivatives using hexadecyltrimethylammonium bromide (HTMAB) as catalyst (10 mol%) is described. This method provides several advantages such as neutral conditions, high yields and simple workup procedure. The catalyst is low cost, facile, active, environmentally friendly, and reusable. In addition, water is chosen as a green solvent. 相似文献
98.
99.
The mixed-metal cluster Yb4O4(OiPr)16Na12 has been synthesized and structurally determined by IR, elemental analysis, and single-crystal X-ray diffraction. The crystal belongs to the cubic system, space group P23 with a = b = c = 13.9788(3), V = 2731.55(10)3 , Z = 1, Dc = 1.202 g/cm 3 , Mr = 1977.42, = 3.480 mm-1 , F(000) = 972, the final R = 0.0288 and wR = 0.1511 for 1677 observed reflections with Ⅰ > 2σ(Ⅰ). X-ray analysis reveals that Yb4O4 (OiPr)16Na12 is centrosym-metric and the structure contains four ytterbium metals and twelve sodium metals, and each ytterbium atom is coordinated by six oxygen atoms. In addition, an ancillary computational analysis of the optimized molecular unit was provided. The large energy gap (3.31 eV) between HOMO and LUMO indicates that the structure framework is particularly stable. 相似文献
100.
A two-step sintering method was used to prepare Al8.31Si1.91Mg3.78O20 (corundum solid solution)/Al4.8Si1.2O9.6 (mullite solid solution)/Mg2.0Al4.02Si4.98O18 (cordierite solid solution) multiphase material, for the purposes of making these three crystal structures have point defects which could help the particles diffuse and transfer at high temperature, accelerate the sintering efficiently and enhance the material strength as well as the bulk density. The impacts of different formulas on the structure and properties of the multiphase material were investigated. With XRD and SEM analyses, for each sample, the crystal structure and microstructure were characterized, the crystalline phase content and cell parameters were determined with Rietveld Quantification software, and the properties were tested. The comparative optimal formula determined was calcinated chamotte of 80wt% and calcinated sludge of 20wt%; and its corresponding bending strength and retention rate of bending strength after a thermal shock were 29.74 MPa and 80.15%, respectively. 相似文献