全文获取类型
收费全文 | 102522篇 |
免费 | 5126篇 |
国内免费 | 4634篇 |
专业分类
化学 | 44150篇 |
晶体学 | 1163篇 |
力学 | 7998篇 |
综合类 | 363篇 |
数学 | 34549篇 |
物理学 | 24059篇 |
出版年
2024年 | 61篇 |
2023年 | 533篇 |
2022年 | 720篇 |
2021年 | 966篇 |
2020年 | 1181篇 |
2019年 | 1263篇 |
2018年 | 11226篇 |
2017年 | 11006篇 |
2016年 | 7328篇 |
2015年 | 2234篇 |
2014年 | 1936篇 |
2013年 | 2336篇 |
2012年 | 6111篇 |
2011年 | 12748篇 |
2010年 | 7369篇 |
2009年 | 7699篇 |
2008年 | 8412篇 |
2007年 | 10320篇 |
2006年 | 1698篇 |
2005年 | 2567篇 |
2004年 | 2542篇 |
2003年 | 2880篇 |
2002年 | 2008篇 |
2001年 | 1145篇 |
2000年 | 884篇 |
1999年 | 659篇 |
1998年 | 549篇 |
1997年 | 430篇 |
1996年 | 429篇 |
1995年 | 326篇 |
1994年 | 225篇 |
1993年 | 219篇 |
1992年 | 180篇 |
1991年 | 194篇 |
1990年 | 163篇 |
1989年 | 133篇 |
1988年 | 110篇 |
1987年 | 89篇 |
1986年 | 99篇 |
1985年 | 80篇 |
1984年 | 63篇 |
1983年 | 49篇 |
1982年 | 46篇 |
1981年 | 42篇 |
1980年 | 48篇 |
1979年 | 49篇 |
1914年 | 45篇 |
1912年 | 40篇 |
1909年 | 41篇 |
1908年 | 40篇 |
排序方式: 共有10000条查询结果,搜索用时 515 毫秒
991.
FT-IR and Raman spectroscopic study of hydrated rubidium (cesium) borates and alkali double borates 总被引:1,自引:0,他引:1
Zhu Lixia Yue Tao Wang Jiang Gao Shiyang 《Russian Journal of Inorganic Chemistry》2007,52(11):1786-1792
FT-IR and Raman spectra of five hydrated alkali borates and five hydrated alkali double borates have been recorded at room
temperature in the range 400 to 4000 cm−1, and analyzed. Fundamental vibrational modes have been identified and assignments tentatively made in comparison with the
work of Janda and Heller, and Li Jun.
The text was submitted by the authors in English. 相似文献
992.
Yuanyuan Han Qinghai Cai Bin Lu Xue Xiao Shuhan Cui 《Reaction Kinetics and Catalysis Letters》2007,91(1):29-35
A novel solid acid prepared from concentrated sulfuric, boric and phosphoric acid is a highly selective catalyst for the dimerization
of α-methylstyrene at room temperature to generate 4-methyl-2,4-diphenyl-1-pentene. 相似文献
993.
以巯基丙酸(MPA)为稳定剂, 利用共沉淀法制备了水溶性的Ag掺杂的ZnxCd1-xS合金型纳米晶. Ag掺杂后ZnxCd1-xS纳米晶产生新的发射峰, 并且发光效率得到了有效提高. 通过改变纳米粒子中Zn/Cd比例可有效地调控ZnxCd1-xS∶Ag纳米晶的吸收带隙宽度, 同时可以在425~603 nm之间实现对ZnxCd1-xS∶Ag纳米晶发射峰位的连续调控. 相似文献
994.
Polymer electrolyte systems were prepared for the first time by dissolution of amidomagnesium chlorides in poly(ethylene oxide),
(PEO). For the preparation, solutions of (hexamethyldisilylamido)magnesium chloride, (dimethylpyrrolyl)magnesium chloride,
(diisopropylamido)magnesium chloride, piperidinomagnesium chloride and morpholinomagnesium chloride were chosen. The composition
of these polymer electrolyte systems corresponds to the general formula R2NMgCl·P(EO)n·THF. Most work has been done with the system (hexamethyldisilylamido)magnesium chloride in PEO, (Me3Si)2NMgCl·P(EO)n·THF, with n= 3, 4, 5, or 7. The electrolytes have a soft rubber-like consistency. At 30 °C, electrical conductivities of 10−6–10−5 S/cm were found. The conductivities were measured in the temperature range 20–60 °C. Within this temperature range a linear
dependence of the logarithms of the conductivity on the inverse temperature was found and activation energies for the conducting
process of 30–60 kJ/mol were calculated. Using those polymer electrolytes with a high content of the amidomagnesium compound,
a reversible magnesium deposition takes place by cathodic reduction at potentials below −1.9 V vs. a Ag/AgCl reference electrode.
These polymer electrolytes were found to be stable against oxidation up to about −0.3 V vs. Ag/AgCl.
Electronic Publication 相似文献
995.
CrystalStructureandMolecularAbsoluteConfigurationof(+)-Isocedranol(C_(15)H_(26)O)¥LiuJie;ChenMin-Qin(CenterofAnalysis&Measurem... 相似文献
996.
Xiao-pingYan Bao-linHe JieZhang Han-fanLiua 《高分子科学》2005,(4):393-399
Modification of transition metal cations to polymer-stabilized Pt colloidal clusters modified with cinchonidine was studied in enantioselective hydrogenation of methyl pyruvate. Compared to the enantiomeric excess (e.e.) value (71.4%) obtained without the presence of metal cations, obvious e.e. enhancement (up to 82.5%) was resulted from the addition of Zn^2 but with a certain decrease in activity. The reaction parameters in the presence of Zn^2 were also studied. It was found that the Pt colloidal catalysts in the presence of metal cations performed very differently from that in the absence of metal cations. 相似文献
997.
The total synthesis of a didemnin B analogue containing a conformationally constrained replacement for the isostatine moiety is reported. Synthetic highlights include an improved preparation of 2-hydroxy-3-cyclohexenecarboxylic acid and a new strategy for accessing the macrocycle. 相似文献
998.
The micellization behavior of an anionic gemini surfactant, GA with nonionic surfactants C12E8 and C12E5 in presence of 0.1 M NaCl at 298 K temperature, has been studied tensiometrically in pure and mixed states, and the related
physicochemical parameters (cmc, γ
cmc, pC
20, Γ
max, and A
min) have been evaluated. Tensiometric profile (γ vs log [surfactant]), for conventional surfactants, generally consists of a single point of intersection; a gradually decreasing
line (normally linear, or with slight curvature) ultimately saturates in γ at a particular [surfactant], corresponding to complete monolayer saturation. The gemini, in this report, led to two unequivocal
breaks in the tensiometric isotherm. An attempt to the interpretation of the two breaks from molecular point of view is provided,
depending solely on the chemical structure of the surfactant. The gemini, even in mixed state with the conventional nonionic
surfactants C12E5 and C12E8, manifested the dual breaks; of course, the dominance of the feature decreases with increasing mole fraction of the nonionics
in the mixture. Theories of Clint, Rosen, Rubingh, Motomura, Georgiev, Maeda, and Nagarajan have been used to determine the
interaction between surfactants at the interface and micellar state of aggregation, the composition of the aggregates, the
theoretical cmc in pure and mixed states, and the structural parameters according to Tanford and Israelachvili. Several thermodynamic
parameters have also been predicted from those theories. 相似文献
999.
Suyun Jie Tianzhu Zhang Jiutong Chen Dongbing Liu Wei Chen 《Journal of organometallic chemistry》2005,690(7):1739-1749
A series of bridged bis(pyridinylimino) ligands were efficiently synthesized through the condensation reaction of 4,4′-methylene-bis(2,6-disubstituted aniline) with 2-pyridinecarboxaldehyde or 2-benzoylpyridine. They reacted with (DME)NiBr2 to form dinuclear Ni(II) complexes. All resultant compounds were characterized by elemental analysis, IR spectra as well as the single-crystal X-ray diffraction to confirm the structures of ligands and complexes. Activated with methylaluminoxane (MAO), these nickel complexes showed considerably good activities for ethylene oligomerization and polymerization. Their catalytic activities and the properties of PEs obtained were depended on the arched environment of ligand and reaction conditions. 相似文献
1000.
Facile synthesis of exfoliated and highly conductive poly(arylene disulfide)/graphite nanocomposites
Exfoliated graphite has been synthesized by first synthesizing H2SO4 intercalated compound in a H2O2‐H2SO4 mixture, followed by exfoliation under microwave irradiation. Poly(arylene disulfide)/graphite nanocomposites were then fabricated by absorbing cyclic(arylene disulfide) oligomers into the pores of exfoliated graphite. Subsequently, the nanocomposite precursor was subjected to heat treatment to carry out the in situ ring‐opening polymerization of the oligomers via free radical mechanism. The as‐prepared nanocomposite exhibited a exfoliated nanostructure as evidenced by transmission electron microscopy (TEM) observation. The nanocomposite with a very small amount of graphite, 5 wt%, possesses a highly electrical conductivity of 4 S/cm, therefore, many applications can be found as conductive materials. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献