全文获取类型
收费全文 | 74篇 |
免费 | 5篇 |
专业分类
化学 | 51篇 |
晶体学 | 1篇 |
力学 | 2篇 |
数学 | 14篇 |
物理学 | 11篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 5篇 |
2019年 | 3篇 |
2018年 | 2篇 |
2017年 | 1篇 |
2016年 | 8篇 |
2015年 | 5篇 |
2014年 | 8篇 |
2013年 | 9篇 |
2012年 | 8篇 |
2011年 | 5篇 |
2010年 | 3篇 |
2009年 | 1篇 |
2008年 | 4篇 |
2007年 | 1篇 |
2006年 | 2篇 |
2004年 | 2篇 |
1996年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1984年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有79条查询结果,搜索用时 31 毫秒
21.
Franco Dinelli Tommaso Sgrilli Andrea Ricci Paolo Baschieri Pasqualantonio Pingue Manjunath Puttaswamy Peter Kingshott 《Journal of Polymer Science.Polymer Physics》2013,51(15):1149-1156
The viscoelastic properties of thin polystyrene (PS) films depend on confinement, as it can modify the molecular dynamics affecting the glass transition. In the recent past, the authors have investigated the region next to the free interface by means of an atomic force microscope suitably modified to monitor the indentation of a tip into a film during a given lapse of time while applying a constant load. Herein, to explore the interface with the substrate, the authors report on experiments in which PS brushes grafted to native silicon oxide were used. It was found that the film wettability on brushes and H‐terminated silicon can be highly improved when compared with native silicon oxide. In addition, the glass transition temperature of thin films increases up to the bulk value in the case of film/brush combinations with high molecular weight or films with high molecular weight on H‐terminated silicon. Data are discussed according to hypotheses such as residual solvent presence, interface free volume, and molecular mechanical coupling. These observations can be of great interest for nanotechnological applications, especially in those instances where one needs to tailor the temperature dependence of viscoelastic properties of thin films. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2013, 51, 1149–1156 相似文献
22.
Vikram Manjunath 《International Journal of Game Theory》2014,43(3):579-597
We study the problem of locating a single public good along a segment when agents have single-dipped preferences. We ask whether there are unanimous and strategy-proof rules for this model. The answer is positive and we characterize all such rules. We generalize our model to allow the set of alternatives to be unbounded. If the set of alternatives does not have a maximal and a minimal element, there is no meaningful notion of efficiency. However, we show that the range of every strategy-proof rule has a maximal and a minimal element. We then characterize all strategy-proof rules. 相似文献
23.
B. N. Manjunath K. Harikrishna Indrapal Singh Aidhen B. Varghese 《Journal of carbohydrate chemistry》2013,32(5):264-277
A new and convenient synthesis of 2-O-benzyl-3, 4: 5, 6-di-O-isopropylidene-D-glucitol has been accomplished and has been generalized with the syntheses of differently protected D-glucitols at C-2 position. In the course of our new route to the differently protected D-glucitols at C-2 position, a new D-gluco configured building block, 1-morpholino-(3, 4: 5, 6-di-O-isopropylidene)-D-gluconamide has been achieved. 相似文献
24.
25.
We introduce a new method for studying universality of random matrices. Let Tn be the Jacobi matrix associated to the Dyson beta ensemble with uniformly convex polynomial potential. We show that after scaling, Tn converges to the stochastic Airy operator. In particular, the top edge of the Dyson beta ensemble and the corresponding eigenvectors are universal. As a byproduct, these ideas lead to conjectured operator limits for the entire family of soft edge distributions.© 2015 Wiley Periodicals, Inc. 相似文献
26.
Vinaya Kambappa Chandrashekara Ganganahalli Kotturappa Raghavendra Sheshachar Manjunath Prasanna Doddakunche Shivaramu 《Journal of heterocyclic chemistry》2020,57(9):3475-3482
In the present study, we are reporting a simple and efficient method for the one-pot synthesis of the biologically important heterocyclic molecules 5-unsubstituted 3,4-dihydropyrimidin-2-ones and thiones using gem-dibromomethylarenes, oxalacetic acid, and urea or thiourea. Gem-dibromomethylarenes are used as aldehyde equivalent for the efficient synthesis of 3,4-dihydropyrimidin-2-ones/thiones. This reaction offers advantages for the synthesis of these compounds, including ready availability of the starting materials, experimental simplicity and in good yields. Besides, the synthesized molecules are interesting for their biological and pharmacological actions. 相似文献
27.
A facile metal-free route of oxidative amination of benzoxazole by activation of C-H bonds with secondary or primary amines in the presence of catalytic iodine in aqueous tert-butyl hydroperoxide proceeds smoothly at ambient temperature under neat reaction condition to furnish the high yield of the aminated product. This user-friendly method to form C-N bonds produces tertiary butanol and water as the byproduct, which are environmentally benign. The application of the methodology is demonstrated by synthesizing therapeutically active benzoxazoles. 相似文献
28.
A novel non-metal catalyzed oxidation of organic azides to nitriles under solvent-free conditions is presented employing catalytic amounts of KI, and DABCO in aq. TBHP at room temperature. This non-metal catalyzed oxidation of azides provides good selectivity as double and triple bonds were not oxidized under the present reaction conditions. 相似文献
29.
The Riemann–Roch theorem on a graph G is related to Alexander duality in combinatorial commutative algebra. We study the lattice ideal given by chip firing on G and the initial ideal whose standard monomials are the G-parking functions. When G is a saturated graph, these ideals are generic and the Scarf complex is a minimal free resolution. Otherwise, syzygies are obtained by degeneration. We also develop a self-contained Riemann–Roch theory for Artinian monomial ideals. 相似文献
30.
H. R. Manjunath S. Naveen C. S. Ananda Kumar S. B. Benaka Prasad M. A. Sridhar J. Shashidhara Prasad K. S. Rangappa 《Journal of chemical crystallography》2012,42(5):504-507