全文获取类型
收费全文 | 99篇 |
免费 | 1篇 |
专业分类
化学 | 61篇 |
晶体学 | 3篇 |
力学 | 1篇 |
数学 | 7篇 |
物理学 | 28篇 |
出版年
2022年 | 3篇 |
2021年 | 2篇 |
2020年 | 5篇 |
2019年 | 2篇 |
2018年 | 5篇 |
2017年 | 3篇 |
2016年 | 3篇 |
2015年 | 3篇 |
2014年 | 4篇 |
2013年 | 7篇 |
2012年 | 3篇 |
2011年 | 7篇 |
2010年 | 11篇 |
2009年 | 5篇 |
2008年 | 3篇 |
2007年 | 3篇 |
2006年 | 3篇 |
2005年 | 2篇 |
2004年 | 5篇 |
2003年 | 3篇 |
2002年 | 2篇 |
2001年 | 3篇 |
2000年 | 5篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1989年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1980年 | 1篇 |
排序方式: 共有100条查询结果,搜索用时 0 毫秒
1.
Karolina Kiebasa ahin Bayar Esin Apaydin Varol Joanna Srescek-Nazzal Monika Bosacka Piotr Midlicki Jarosaw Serafin Rafa J. Wrbel Beata Michalkiewicz 《Molecules (Basel, Switzerland)》2022,27(21)
Cost-effective activated carbons for CO2 adsorption were developed from molasses using H2SO4, H3PO4, HCl, NaOH, and KOH as activating agents. At the temperature of 0 °C and a pressure of 1 bar, CO2 adsorption equal to 5.18 mmol/g was achieved over activated carbon obtained by KOH activation. The excellent CO2 adsorption of M-KOH can be attributed to its high microporosity. However, activated carbon prepared using HCl showed quite high CO2 adsorption while having very low microporosity. The absence of acid species on the surface promotes CO2 adsorption over M-HCl. The pore size ranges that are important for CO2 adsorption at different temperatures were estimated. The higher the adsorption temperature, the more crucial smaller pores were. For 1 bar pressure and temperatures of 0, 10, 20, and 30 °C, the most important were pores equal and below: 0.733, 0.733, 0.679, and 0.536 nm, respectively. 相似文献
2.
3.
Begüm Akduman Murat Uygun Esin Poyrazoğlu Çoban Deniz Aktaş Uygun Halil Bıyık Sinan Akgöl 《Applied biochemistry and biotechnology》2013,171(8):2285-2294
In this work, bacterial cellulose nanofibers were produced by using the Gluconacetobacter hansenii HE1 strain. These nanofibers were derivatized with dye affinity ligand Reactive Green 5, and these newly synthesized dye-attached nanofibers were used for affinity adsorption of urease. Reactive Green 5-attached nanofibers were characterized by Fourier transform infrared spectroscopy, SEM, and energy-dispersive x-ray spectroscopy analysis. Some adsorption conditions which significantly affect the adsorption efficiency were investigated. The maximum urease adsorption capacity was found to be 240 mg/g nanofiber in pH 6.0 and at room temperature. Dye-free plain nanofibers also used for studying nonspecific urease adsorption onto plain nanofibers and nonspecific adsorption were found to be negligible (3.5 mg/g nanofiber). Prepared dye-attached nanofibers can be used in five successive adsorption/desorption steps without any decrease in their urease adsorption capacity. The desorption rate of the adsorbed urease was found to be 98.9 %. The activity of the urease was also investigated, and it was found that free and desorbed urease from the dye-attached nanofibers showed similar specific activity. 相似文献
4.
A relationship is shown to exist between the size of the cellular-dendritic substructure and the growth conditions. The dependence of the cell diameter on the crystallization rate is non-monotonic, having a maximum in the region of low solidification rates. Theoretical calculations are compared with experimental data. 相似文献
5.
JETP Letters - We experimentally investigate longitudinal and transverse second-harmonic voltage response to ac electrical current for a magnetic Weyl semimetal Co3Sn2S2. In contrast to the... 相似文献
6.
Parallel Simulated Annealing Algorithms in Global Optimization 总被引:4,自引:0,他引:4
Global optimization involves the difficult task of the identification of global extremities of mathematical functions. Such problems are often encountered in practice in various fields, e.g., molecular biology, physics, industrial chemistry. In this work, we develop five different parallel Simulated Annealing (SA) algorithms and compare them on an extensive test bed used previously for the assessment of various solution approaches in global optimization. The parallel SA algorithms consist of various categories: the asynchronous approach where no information is exchanged among parallel runs and the synchronous approaches where solutions are exchanged using genetic operators, or where solutions are transmitted only occasionally, or where highly coupled synchronization is achieved at every iteration. One of these approaches, which occasionally applies partial information exchanges (controlled in terms of solution quality), provides particularly notable results for functions with vast search spaces of up to 400 dimensions. Previous attempts with other approaches, such as sequential SA, adaptive partitioning algorithms and clustering algorithms, to identify the global optima of these functions have failed without exception. 相似文献
7.
Suchandrima Banerjee Esin Ozturk-Isik Sarah J. Nelson Sharmila Majumdar 《Magnetic resonance imaging》2009
Magnetic Resonance Spectroscopic Imaging (MRSI) is a technique for imaging spatial variation of metabolites and has been very useful in characterizing biochemical changes associated with disease as well as response to therapy in malignant pathologies. This work presents a self-calibrated undersampling to accelerate 3D elliptical MRSI and an extrapolation-reconstruction algorithm based on the GRAPPA method. The accelerated MRSI technique was tested in three volunteers and five brain tumor patients. Acceleration allowed larger spatial coverage and consequently, less lipid contamination in spectra, compared to fully sampled acquisition within the same scantime. Metabolite concentrations measured from the accelerated acquisitions were in good agreement with measurements obtained from fully sampled MRSI scans. 相似文献
8.
V. M. Grachev V. I. Esin N. G. Polukhina S. G. Rassomakhin 《Bulletin of the Lebedev Physics Institute》2014,41(5):119-122
The problem of the creation of the needed technology allowing the effective development of corporate databases is considered. As a solution, we propose a new technology based on the “object-event” semantic model and the use of the universal data model, data model language, and special database software development tools. The principal features of the proposed technology and its advantages are considered. 相似文献
9.
M. M. Zverev V. O. Val’dner N. A. Gamov R. V. Esin S. I. Gronin E. V. Zhdanova S. V. Ivanov P. S. Kop’ev D. V. Peregoudov I. V. Sedova S. V. Sorokin V. B. Studionov 《Optics and Spectroscopy》2011,111(2):178-181
The fracture patterns of active elements of pulsed green lasers with transverse electron-beam pumping, based on ZnSe-containing quantum-size structures, have been investigated. The fracture in the form of thin (~1 μm) and long (to 100–150 μm) filaments can be explained by the self-focusing of the intrinsic laser radiation in the semiconductor structure. 相似文献
10.
Mehmet?Gokhan?Caglayan Esin?Kasap Demet?Cetin Zekiye?Suludere Ugur?TamerEmail author 《Mikrochimica acta》2017,184(4):1059-1067
The authors report on a robust method for the synthesis of gold nanorods (AuNRs) with tunable dimensions and longitudinal surface plasmon resonance. The method relies on seed-mediated particle growth in the presence of benzalkonium chloride (BAC) in place of the widely used surfactant cetyltrimethyl ammonium bromide (CTAB). Uniform AuNRs were obtained by particle growth in solution, and BAC is found to stabilize the AuNRs for >1 year. The SERS activity of the resulting AuNRs is essentially identical to that of CTAB-protected nanorods. The SERS activity of the BAC protected nanorods was applied to the quantitative analysis of potato virus X (PVX). The calibration plot for PVX is linear in the 10 to 750 ng?mL?1 concentration range, and the detection limit is 2.2 ng?mL?1. 相似文献