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排序方式: 共有271条查询结果,搜索用时 15 毫秒
181.
Roy A Prabhakaran P Baruah PK Sanjayan GJ 《Chemical communications (Cambridge, England)》2011,47(42):11593-11611
Conformationally ordered synthetic oligomers, also called "foldamers", have attracted considerable attention in recent years owing to their ability to mimic the structural architecture of biopolymers and also because of their potential applications in biomedical and material science fields. Until recently, the major focus in this area has been the development of oligomers featuring a single type of monomer building blocks. However, due to the enormous possibility of augmenting the conformational space available for oligomer design, the hetero foldamer approach has been introduced very recently. This feature article aims to describe foldamers with unique structural architectures, exclusively featuring heterogeneous backbones (hetero foldamers). 相似文献
182.
We consider the point processes based on the eigenvalues of the reverse circulant, symmetric circulant and k-circulant matrices with i.i.d. entries and show that they converge to a Poisson random measures in vague topology. The joint
convergence of upper ordered eigenvalues and their spacings follow from this. We extend these results partially to the situation
where the entries are come from a two sided moving average process. 相似文献
183.
Paramita Gayen Somnath Jan Dr. Nilkanta Chowdhury Dr. Snehasish Ghosh Monjuri Hembram Dr. Angshuman Bagchi Dr. Rituparna Sinha Roy 《化学:亚洲杂志》2021,16(24):4018-4036
Developing non-immunogenic therapeutic biomolecules for facilitating blood clotting followed by wound healing via therapeutic angiogenesis, still remains a formidable challenge. Excessive blood loss of accident victims and battalions cause a huge number of deaths worldwide. Patients with inherited bleeding disorders face acute complications during injury and post-surgery. Biologically-inspired peptide-based hemostat can act as a potential therapeutic for handling coagulopathy. Additionally, non-healing wounds for patients having ischemic diseases can cause severe clinical complications. Advancement in stabilized growth-factor-based proangiogenic therapy may offer effective possibilities for the treatment of ischemic pathology. This review will discuss nature-inspired biocompatible stabilized peptide- and protein-based molecular medicines to serve unmet medical challenges for handling traumatic coagulopathy and impaired wound healing. 相似文献
184.
Fluorescein sodium, which does not exhibit electrical bistability in thin films, can be switched to a high conducting state by the introduction of carbon nanotubes as channels for carrier transport. Thin films based on fluorescein sodium/carbon nanotubes display memory switching phenomenon among a low conducting state and several high conducting states. Read-only and random-access memory applications between the states resulted in multilevel memory in these systems. Results in thin films and in a monolayer (deposited via layer-by-layer assembly) show that instead of different molecular conformers, multilevel conducting states arise from the different density of high conducting fluorescein molecules. 相似文献
185.
Environmentally Friendly Synthesis of p‐Doped Reduced Graphene Oxide with High Dispersion Stability by Using Red Table Wine
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Suk‐Joon Kim Jang Mi Lee Roy Arup Kumer Prof. Sung Young Park Prof. Sang Chun Kim Prof. Insik In 《化学:亚洲杂志》2015,10(5):1192-1197
Reduced graphene oxide (rGO) with high dispersion stability and p‐type semiconducting property was synthesized by using environmentally friendly mussel‐inspired chemistry with red table wine. (+)‐Catechin and tannic acid, polyphenolic model compounds present in wine, were selected and successfully utilized for the synthesis of soluble polycatechol‐functionalized rGO. 相似文献
186.
In this paper we employ the hydrodynamic formulation of time-dependent density functional theory to obtain the van der Waals
coefficientsC
6
andC
8
of alkali metal clusters of various sizes including very large clusters. Such calculations become computationally very demanding
in the orbital-based Kohn-Sham formalism, but are quite simple in the hydrodynamic approach. We show that for interactions
between the clusters of the same sizes,C
6
andC
8
scale as the sixth and the eighth power of the cluster radius, respectively, and approach their classically predicted values
for the large size clusters. 相似文献
187.
Jyotirekha G. Handique Arup Purkayashtha Jubaraj B. Baruah 《Journal of organometallic chemistry》2001,620(1-2)
The reduction of α,β unsaturated carbonyl compounds by sodiumborohydride is catalysed by Ni(bpy)Cl2 (bpy=2,2′-bipyridine). Various carbonyl compounds having the general formula R1CH=CHCRO [where R1, R=C6H5, H; p-MeO---C6H4---,C6H4; p-CH3---C6H4, C6H5; (m-OMe---)(p-OMe---)C6H3, C6H5; C6H5, (CH3)2CH---; CH3, H; m-Br---C6H4---, C6H5] are reduced to corresponding allylicalcohol [R1CH=CHCRHOH] at 25°C within half an hour. During these reductions the double bond is partially reduced to give saturated alcohols as minor products having the molecular formula R1CH2CH2CRHOH. The reduction of trans-3-phenyl-2-propenal with NaBH4 and catalytic amounts of Ni(bpy)Cl2 in solvents containing active deuterium (D2O, CD3OD), leads to the partial incorporation of deuterium at the α and γ positions to give C---D bonded alcohols. 相似文献
188.
189.
A very efficient algorithm for determining the geometrically feasible binding modes of a flexible ligand molecule at the receptor site is presented. It is based on distance geometry but maintains the requirements of three dimensions. The distance geometry manipulation can superimpose two bodies without explicitly calculating the necessary rigid rotation and translation. The whole conformation space of a flexible molecule can be efficiently examined by considering only a finite number of conformational points. The method is suitable only when the criterion for superposition is some minimum distance limit. It cannot, however, give the exact distance between two points in two different bodies. 相似文献
190.
Rupesh A. Khare Arup R. Bhattacharyya Ajit R. Kulkarni Madhumita Saroop Amit Biswas 《Journal of Polymer Science.Polymer Physics》2008,46(21):2286-2295
Polypropylene (PP) and acrylonitrile‐butadiene‐styrene (ABS) blends with multiwall carbon nanotubes (MWNT) were prepared by melt mixing. PP/ABS blends without MWNT revealed coarse co continuous structures on varying the ABS content from 40 to 70 wt %. Bulk electrical conductivity of the blends showed lower percolation threshold (0.4–0.5 wt %) in the 45/55 co continuous blends whereas the percolation threshold was between 2 and 3 wt % in matrix‐particle dispersed morphology of 80/20 blends. Interestingly, droplet size was observed to decrease with addition of MWNT above percolation threshold in 80/20 blends. Further, the bulk electrical conductivity was found to be dependent on the melt flow index of PP. The non‐polar or weakly polar nature of blends constituents resulted in the temperature independent dielectric constant, dielectric loss, and DC electrical conductivity. Rheological analysis revealed the formation of 3D network‐like structure in 80/20 PP/ABS blends at 3 wt % MWNT. An attempt was made to understand the relationship between rheology, morphology, and electrical conductivity of these blends. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 2286–2295, 2008 相似文献