全文获取类型
收费全文 | 57篇 |
免费 | 3篇 |
专业分类
化学 | 31篇 |
力学 | 7篇 |
数学 | 7篇 |
物理学 | 15篇 |
出版年
2020年 | 1篇 |
2018年 | 1篇 |
2017年 | 2篇 |
2016年 | 4篇 |
2015年 | 1篇 |
2014年 | 2篇 |
2013年 | 8篇 |
2010年 | 2篇 |
2008年 | 3篇 |
2007年 | 2篇 |
2005年 | 1篇 |
2002年 | 1篇 |
2000年 | 2篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1990年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1981年 | 1篇 |
1979年 | 2篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1967年 | 1篇 |
1966年 | 1篇 |
1964年 | 2篇 |
1962年 | 1篇 |
1961年 | 1篇 |
1960年 | 1篇 |
1959年 | 1篇 |
1943年 | 2篇 |
1940年 | 2篇 |
1933年 | 2篇 |
排序方式: 共有60条查询结果,搜索用时 15 毫秒
11.
Somarajan S Hasan SA Adkins CT Harth E Dickerson JH 《The journal of physical chemistry. B》2008,112(1):23-28
The controlled electrophoretic deposition of polystyrene/divinylbenzene (PS/DVB) star polymer films from a colloidal suspension is reported. Liquid suspensions, containing the PS/DVB star polymer, were prepared by injecting a dichloromethane (DCM) solution of the star polymer into a stratified liquid combination of hexane and DCM. A variety of hexane/DCM volume ratios were examined to identify the optimal solution conditions for electrophoretic deposition; thin films were produced from both unmixed and well-mixed hexane/DCM suspensions. Unmixed suspensions yielded spatially separated thin films, deposited in a controlled fashion, that were dependent on the polarity of the corresponding electrode. Films on the positive electrode differed in thickness, microstructure, and appearance from those formed on the negative electrode. In contrast, films produced from well-mixed hexane/DCM suspensions deposited uniformly across only the negative electrode. Atomic force microscopy studies revealed nanostructured surface morphologies that were unique to each of these films. Additionally, these microscopy studies shed light on the possible conformations of star polymers adsorbed on a surface. By controlling the composition and the mixing state of the solution and by controlling the bias of electrodes, we achieved controlled deposition of star polymer films with a specific nanostructure. These nanostructured films may have broad use in optical and biological device applications. 相似文献
12.
Kathleen E. Berg Jaclyn A. Adkins Sarah E. Boyle Charles S. Henry 《Electroanalysis》2016,28(4):679-684
Mn concentrations were determined using square‐wave cathodic stripping voltammetry (CSV) with inexpensive, stencil‐printed carbon ink electrodes generated on polypropylene transparency films. Using an optimized pH 5 ammonium acetate buffer and addition of 1,4‐benzoquinone, a detection limit as low as 500 nM (30 ppb) was achieved. Addition of 1,4‐benzoquinone improved peak potential reproducibility and height, while addition of 3.5 % w/w sodium chloride to the background solution approximately doubled the sensitivity (μA/ppm). Tolerance tests with interfering metals were conducted and the method was found to be resilient to chromium(VI), iron(III), magnesium(II), nickel(II), and zinc(II), but susceptible to aluminum(III), copper(II), iron(II), and lead(II) at concentration ratios at or below one. This technique was successfully used to measure Mn levels in yerba mate and green tea samples as an example application. 相似文献
13.
K. Fischer C. H. Weiss P. Woog E. Masters A. E. Goddard S. W. Ferris F. Höppler O. Scarpa L. Steiner St. M. Rogers L. R. Adkins H. Mallison H. Vollmann A. Ter-Pogossjan E. Schlenker J. Givaudon A. C. Galletti F. L. de Beaukelaer J. R. Powell E. F. Bahlmann 《Analytical and bioanalytical chemistry》1933,95(9-10):342-348
14.
15.
Gaurav S. J. B. Rana Timothy P. York Jeffery S. Edmiston Barbara K. Zedler Joel G. Pounds Joshua N. Adkins Richard D. Smith Zaigang Liu Guoya Li Bradley T. Webb Edward L. Murrelle Jason W. Flora 《Analytical and bioanalytical chemistry》2010,397(5):1809-1819
Chronic obstructive pulmonary disease (COPD) is the fourth leading cause of morbidity and mortality in the United States and cigarette smoking is a primary determinant of the disease. COPD is characterized by chronic airflow limitation as measured by the forced expiratory volume in one second (FEV1). In this study, the plasma proteomes of 38 middle-aged or older adult smokers with mild to moderate COPD, with FEV1 decline characterized as either rapid (RPD, n?=?20) or slow or absent (SLW, n?=?18), were interrogated using a comprehensive high-throughput proteomic approach, the accurate mass and time (AMT) tag technology. This technology is based upon a putative mass and time tag database (PMT), high-resolution LC separations and high mass accuracy measurements using FT-ICR MS with a 9.4-T magnetic field. The peptide and protein data were analyzed using three statistical approaches to address ambiguities related to the high proportion of missing data inherent to proteomic analysis. The RPD and SLW groups were differentiated by 55 peptides which mapped to 33 unique proteins. Twelve of the proteins have known roles in the complement or coagulation cascade and, despite an inability to adjust for some factors known to affect lung function decline, suggest potential mechanistic biomarkers associated with the rate of lung function decline in COPD. Whether these proteins are the cause or result of accelerated decline will require further research. 相似文献
16.
Grotjahn DB Lo HC Dinoso J Adkins CD Li C Nolan SP Hubbard JL 《Inorganic chemistry》2000,39(12):2493-2499
A comparative synthetic, structural, and thermochemical study on a series of chelate complexes containing the fragment (eta 5-C5Me5)Ir [(eta 5-C5Me5)Ir(TsNCH2CH2NTs) (1), (eta 5-C5Me5)Ir(TsNCH2CO2) (2), (eta 5-C5Me5)Ir(CO2CO2) (3)] was performed to clarify the roles of carboxylato and sulfonamido ligands. Whereas 1 and 2 are monomeric in solution and in the solid state, 3 appears to exist as an oligomer or polymer, (3)n, which can be broken up by addition of a ligand L such as a phosphine, CO, or 2-methoxypyridine to form (eta 5-C5Me5)Ir(L)(CO2CO2) (6). The synthesis of (3)n from [(eta 5-C5Me5)IrCl(mu-Cl)]2 required the use of silver oxalate in CH3CN, but if other solvents were used, the bridging oxalato complex (eta 5-C5Me5)IrCl(mu-eta 2-eta 2-C2O4)ClIr(eta 5-C5Me5) (7) was obtained and identified by X-ray diffraction. Enthalpies for reaction of THF-soluble monomers 1 and 2 with PMe3 were determined to be -28.7(0.5) and -28.5(0.4) kcal mol-1, respectively. The oligomerization behavior of 3 may be a result of reduced sigma- or pi-donation of carboxylato ligands compared to N-tosylamido ligands, because the values for nu CO in oxalato and bissulfonamido complexes 6-CO and (eta 5-C5Me5)Ir(CO)(TsNCH2CH2NTs) (4-CO) were 2064 and 2042 cm-1, respectively. 相似文献
17.
Kui Huang Teresa A. Croce Sharon K. Hamilton Chinessa T. Adkins Billie L. Evans III Eva Harth 《Macromolecular Symposia》2007,255(1):20-23
Summary: The development of suitable delivery systems for intracellular delivery of proteins, peptides and other bioactive materials opens the possibility to establish refined strategies for small drug delivery, gene delivery and vaccination. We present the assembly of advanced drug delivery systems from tailored building blocks to scaffolds and bioactive cargos to afford targeting and transport across biological barriers. In particular, the utilization of novel molecular transporter will advance the bioavailability of small and macromolecular drugs that show targeted intracellular delivery. 相似文献
18.
Lele Su Xiaowei Li Hai Ming Jason Adkins Mangmang Liu Qun Zhou Junwei Zheng 《Journal of Solid State Electrochemistry》2014,18(3):755-762
A series of LiMn1-x V x PO4 samples have been synthesized successfully via a conventional solid-state reaction method. The active materials are characterized by x-ray diffraction, x-ray photoelectron spectroscopy, and scanning electron microscopy. The electrochemical performances of the samples are tested using cyclic voltammetry, electrochemical impedance spectroscopy, and charge/discharge measurement techniques. It is confirmed that the samples are in single phase when the content of vanadium (x) is lower than 0.05. If that content is higher than 0.1, the samples are shown to contain an additional conductive phase of Li3V2(PO4)3. The vanadium doping significantly enhances the electrochemical properties of LiMnPO4. It is underlined that the optimal ratio for a low-vanadium doping with the best electrochemical performance is 0.1 and this material exhibits a corresponding initial charge and discharge capacity of 98.9 and 98.1 mAh g?1 at 0.1 C under 50 °C. The capacity retention is higher than 99 % after 30 cycles. The dramatic electrochemical improvement of the LiMnPO4 samples is ascribed to the strengthened ability of lithium-ion diffusion and enhanced electronic conductivity for the V-doped samples. 相似文献
19.
20.
D. Reichinstein W. F. Whitmore A. Revukas W. Covert und H. Adkins 《Fresenius' Journal of Analytical Chemistry》1943,125(1-2):58-59
Ohne Zusammenfassung 相似文献