全文获取类型
收费全文 | 109篇 |
免费 | 1篇 |
专业分类
化学 | 73篇 |
晶体学 | 3篇 |
力学 | 1篇 |
数学 | 7篇 |
物理学 | 26篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2020年 | 1篇 |
2019年 | 4篇 |
2018年 | 2篇 |
2017年 | 5篇 |
2016年 | 2篇 |
2014年 | 2篇 |
2013年 | 9篇 |
2012年 | 8篇 |
2011年 | 10篇 |
2010年 | 2篇 |
2009年 | 4篇 |
2008年 | 7篇 |
2007年 | 3篇 |
2006年 | 7篇 |
2005年 | 4篇 |
2004年 | 3篇 |
2003年 | 5篇 |
2002年 | 1篇 |
1999年 | 1篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1970年 | 2篇 |
1935年 | 1篇 |
1932年 | 3篇 |
1931年 | 3篇 |
1930年 | 1篇 |
1928年 | 4篇 |
1927年 | 1篇 |
1925年 | 4篇 |
1922年 | 2篇 |
1921年 | 1篇 |
排序方式: 共有110条查询结果,搜索用时 31 毫秒
11.
12.
We report the fabrication of La(0.7)Ca(0.3)MnO(3) nanotubes (LCMONTs) with a diameter of about 200 nm, by a modified sol-gel method utilizing nanochannel alumina templates. High resolution transmission electron microscopy confirmed that the obtained LCMONTs are made up of nanoparticles (8-12 nm), which are randomly aligned in the wall of the nanotubes. The strong irreversibility between zero field cooling (ZFC) and field cooling (FC) magnetization curves as well as a cusplike peak in the ZFC curve gives strong support for surface spin glass behavior. 相似文献
13.
Hydroxyapatite coating on stainless steel pre-coated with bovine serum albumin at ambient conditions
Nayar S Pramanick AK Sharma BK Mishra RK Bansal SK Prajapati A Sahu KK Das SK Pathak L Sinha A 《Colloids and surfaces. B, Biointerfaces》2006,48(2):183-187
A biomimetic process for coating of nanosized hydroxyapatite on stainless steel, which capitalises the dual nature of the protein bovine serum albumin in both metal binding and a strong affinity for calcium ions, has been developed. The novelty of the process lies in pre-conditioning the metallic surface using the above protein prior to its mineralization with hydroxyapatite at ambient conditions. The microporous morphology of these coatings may provide favourable solubility and resorbability as desired by many orthopaedic and orthodontic applications. 相似文献
14.
Satyendra Kumar Pandey 《Tetrahedron letters》2006,47(25):4167-4169
An efficient and short synthesis of (2R,3R)- and (2S,3S)-β-hydroxyornithine 1a-b is described using Sharpless asymmetric dihydroxylation and regioselective nucleophilic opening of a cyclic sulfite as the key steps. 相似文献
15.
Dhammaraj Rokade Lal B. Azad Suparna Poddar Satyendra Mishra Harshawardhan V. Pol 《Journal of Macromolecular Science: Physics》2017,56(4):213-233
The research described was concerned with the effect of layered-silicate-based organically modified nanoclay fillers on controlling the extent of necking in a polymer melt extrusion film casting (EFC) process. We show that a linear polythylene resin (such as a linear low-density polyethylene—LLDPE) filled with a very low percentage of well-dispersed (or intercalated) nanoclay displays an enhanced resistance to the necking phenomenon. In general, melt-compounded nanoclay-filled LLDPE resin formulations displayed a higher final film width (less necking), thus a lower final film thickness (greater draw down for the same draw ratio), and cooled down faster when compared to the base LLDPE resin. Incorporation of nanoclay filler in the mainly linear chain LLDPE resin led to significant modification of the melt rheological properties that, in turn, affected the melt processability of these formulations. Primarily, the intercalated nanoclay-filled LLDPE formulations displayed the presence of strain-hardening in unaxial extensional rheology. Additionally, the presence of well-dispersed nanoclay in the LLDPE resin led to a display of prominent extrudate swell indicating the presence of melt elasticity in such formulations. The presence of melt elasticity, as shown by shear rheology and strain-hardening, observed by uniaxial extensional rheology, contributed to the LLDPE nanoclay formulations displaying an enhanced resistance to necking for these films. It can be concluded that linear chain polymers susceptible to necking in an EFC process can be made more resistant to such necking by using nanoclay fillers at very low levels of loading. 相似文献
16.
17.
Quality profile of litchi (Litchi chinensis) cultivars from India and effect of radiation processing
Sachin N. Hajare Sudhanshu Saxena Sanjeev Kumar Surbhi Wadhawan Varsha More B.B. Mishra Madan Narayan Parte Satyendra Gautam Arun Sharma 《Radiation Physics and Chemistry》2010,79(9):994-1004
Litchi (Litchi chinensis) is a non-climacteric tropical fruit. The fruit has a short shelf-life making its marketing difficult. Physical, biochemical, microbiological, and organoleptic properties of two major commercially grown Indian cultivars of litchi, ‘Shahi’ and ‘China’ were studied. The effect of gamma radiation processing and low temperature storage on the above parameters was evaluated to standardize the optimal process parameters for shelf-life extension of litchi. Physical and biochemical parameters analyzed included weight, moisture, pH, titratable acidity, texture, color, total and reducing sugar, total soluble solids, vitamin C, and flavonoid content. Weight, moisture content, and pH in the fresh fruit ranged between 21–26 g, 74–77%, and 3.7–4.4, respectively, whereas, total and reducing sugar ranged 10–15, and 10–13 g%, respectively. In ‘Shahi’ vitamin C content was found to be around 17–19 mg%, whereas, in ‘China’ it was 22–28 mg%. Flavonoid content was in the range of 26–34 μg catechin equivalents/g of fresh fruit. Total surface and internal bacterial load was around 4 and 3 log cfu/g, respectively. Surface yeast-mold count (YMC) was ~3 log cfu/g whereas internal YMC was ~2 log cfu/g. Radiation treatment reduced microbial load in a dose dependent manner. Treatment at 0.5 kGy did not significantly affect the quality parameters of the fruit. Treated fruits retained the “good” organoleptic rating during storage. Thus, radiation treatment (0.5 kGy) in combination with low temperature (4 °C) storage achieved a shelf-life of 28 days for litchi fruit. 相似文献
18.
19.
Satyendra Ray 《Colloid and polymer science》1935,73(3):269-272
Zusammenfassung Durch Festlegung zweier Diskontinuit?ten in den Daten für ges?ttigten Wasserdampf, wie sie von Zeuner in Landolt-B?rnstein's
Tabellen angegeben sind, wurde eine interessante A Best?tigung der Theorie erhalten. Diese Diskontinuit?ten stellen eine Art
‚'verz?gernden Effekt“ in der Bestimmung der Konstanten dar.
übersetzt von R. Riedel (Leipzig). 相似文献
20.
Rajkumar Joshi Guruaribam Shashikumar Sharma Vikrant Kumar Athar Adil Hashmi Satyendra Kumar R. Achila M. Ejaz Hussain 《应用有机金属化学》2006,20(11):740-746
A heteroscorpionate ligand, potassium hydrobis(benzoato)(salicylaldehyde)borate (KL), has been synthesized. This was converted into organotin complexes R2SnL2 and R3SnL complexes by mixing and stirring with a methanolic solution/suspension of organotin chloride. The ligand and its complexes were characterized by elemental analyses and spectral studies (IR, 1H NMR, 13C NMR, ESI mass spectra and Thermo gravimetric analysis (TGA)). Antibacterial and antifungal studies of these compounds were evaluated by the disc diffusion method at variable concentration against three species of bacteria (Staphylococcus aureus, Klebsiella pneumonia and Bacillius subtillis) and two species of fungi (Asperjillius fiavus and Candida albicans). It was found that triorganotin derivatives (R3SnL) of the ligand were more effective as compared with diorganotin derivatives (R2SnL2). The organotin complexes of borates were tested for their algicidal activity on the cyanobacterial strains Aulosira fertilissma, Anabaena species, Anabaena variabilis and Nostoc muscorum and showed high to moderate toxicity towards the above species. The ligand and its complexes were also tested for its pH effect on soil in vitro for a duration of more than one month and it was found that they are able to kill pests without damaging the soil quality. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献