全文获取类型
收费全文 | 64篇 |
免费 | 4篇 |
专业分类
化学工业 | 17篇 |
金属工艺 | 3篇 |
机械仪表 | 1篇 |
矿业工程 | 1篇 |
轻工业 | 15篇 |
水利工程 | 1篇 |
石油天然气 | 2篇 |
无线电 | 4篇 |
一般工业技术 | 13篇 |
冶金工业 | 5篇 |
原子能技术 | 1篇 |
自动化技术 | 5篇 |
出版年
2021年 | 2篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 1篇 |
2016年 | 1篇 |
2015年 | 2篇 |
2014年 | 2篇 |
2013年 | 4篇 |
2012年 | 3篇 |
2011年 | 5篇 |
2010年 | 1篇 |
2009年 | 1篇 |
2008年 | 2篇 |
2007年 | 3篇 |
2006年 | 1篇 |
2002年 | 1篇 |
2000年 | 1篇 |
1999年 | 4篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1994年 | 1篇 |
1993年 | 6篇 |
1992年 | 2篇 |
1990年 | 2篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1983年 | 1篇 |
1979年 | 3篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有68条查询结果,搜索用时 15 毫秒
11.
Material soluble in chloroform has been extracted from bright bituminous coals of two different ranks
- 1. (1) following preheating to the temperatures of maximal plasticity;
- 2. (2) after treatment with sodium in liquid ammonia;
- 3. (3) by fractionating the pyridine extracts;
- 4. (4) after preliminary acetylation with acetic anhydride in the presence of pyridine.
12.
13.
Angelova Anelia Carneiro Gustavo Sünderhauf Niko Leitner Jürgen 《International Journal of Computer Vision》2020,128(5):1160-1161
International Journal of Computer Vision - 相似文献
14.
Violina R Angelova Angel S Ivanov Dimitar M Braikov 《Journal of the science of food and agriculture》1999,79(5):713-721
An Erratum has been published for this article in Journal of the Science of Food and Agriculture 79(15)1999, 2122. The investigation was carried out in the period 1991–1995 in a region with a major industrial pollutant, the Non‐Ferrous‐Metal Works, and a region with no industrial pollutants (as a control). The heavy metal content in soil, roots, annual shoots and perennial parts of grapevine, leaves, grapes and wine, was determined. Soil samples and roots of the rootstock Kober 5BB were taken at 10 cm intervals from depths of 0–100 cm. Roots were divided by thickness in fractions at 1 mm intervals. The shoots, bark, vascular tissue, wood, core and diaphragm were investigated. The leaf analyses included leaf blade and leaf petioles, and those of grapes, berry‐free raceme (washed in a lot of water and unwashed). Berries were analysed (the berry skin, the pulp and the seeds). The results obtained for the Pb, Cu, Zn and Cd contents in the grapevine roots show that they depend significantly both on their amounts in the soil and the age of the roots. The main parts of the heavy metal amounts taken by the roots of the grapevine from the soil are fixed and accumulated in the young feed rootlets (with diameters of 1 mm), and small amounts of them move through the conducting system to the older, larger diameter root system. The experimental data obtained for the presence of Pb, Cu, Zn and Cd in the separate tissues and organs of grapevines grown in an industrially polluted region showed that their amounts were mainly due to the heavy‐metal‐containing aerosols falling from the atmosphere. Part of them, however, got into the soil, and from there, even if in minimal amounts, penetrated via the root system into the grapevine plants and accumulated into their different overground parts. © 1999 Society of Chemical Industry 相似文献
15.
Angelova A Angelov B Mutafchieva R Lesieur S Couvreur P 《Accounts of chemical research》2011,44(2):147-156
Lipids and lipopolymers self-assembled into biocompatible nano- and mesostructured functional materials offer many potential applications in medicine and diagnostics. In this Account, we demonstrate how high-resolution structural investigations of bicontinuous cubic templates made from lyotropic thermosensitive liquid-crystalline (LC) materials have initiated the development of innovative lipidopolymeric self-assembled nanocarriers. Such structures have tunable nanochannel sizes, morphologies, and hierarchical inner organizations and provide potential vehicles for the predictable loading and release of therapeutic proteins, peptides, or nucleic acids. This Account shows that structural studies of swelling of bicontinuous cubic lipid/water phases are essential for overcoming the nanoscale constraints for encapsulation of large therapeutic molecules in multicompartment lipid carriers. For the systems described here, we have employed time-resolved small-angle X-ray scattering (SAXS) and high-resolution freeze-fracture electronic microscopy (FF-EM) to study the morphology and the dynamic topological transitions of these nanostructured multicomponent amphiphilic assemblies. Quasi-elastic light scattering and circular dichroism spectroscopy can provide additional information at the nanoscale about the behavior of lipid/protein self-assemblies under conditions that approximate physiological hydration. We wanted to generalize these findings to control the stability and the hydration of the water nanochannels in liquid-crystalline lipid nanovehicles and confine therapeutic biomolecules within these structures. Therefore we analyzed the influence of amphiphilic and soluble additives (e.g. poly(ethylene glycol)monooleate (MO-PEG), octyl glucoside (OG), proteins) on the nanochannels' size in a diamond (D)-type bicontinuous cubic phase of the lipid glycerol monooleate (MO). At body temperature, we can stabilize long-living swollen states, corresponding to a diamond cubic phase with large water channels. Time-resolved X-ray diffraction (XRD) scans allowed us to detect metastable intermediate and coexisting structures and monitor the temperature-induced phase sequences of mixed systems containing glycerol monooleate, a soluble protein macromolecule, and an interfacial curvature modulating agent. These observed states correspond to the stages of the growth of the nanofluidic channel network. With the application of a thermal stimulus, the system becomes progressively more ordered into a double-diamond cubic lattice formed by a bicontinuous lipid membrane. High-resolution freeze-fracture electronic microscopy indicates that nanodomains are induced by the inclusion of proteins into nanopockets of the supramolecular cubosomic assemblies. These results contribute to the understanding of the structure and dynamics of functionalized self-assembled lipid nanosystems during stimuli-triggered LC phase transformations. 相似文献
16.
R. E. Siemon B. S. Bauer T. J. Awe M. A. Angelova S. Fuelling T. Goodrich I. R. Lindemuth V. Makhin W. L. Atchison R. J. Faehl R. E. Reinovsky P. J. Turchi J. H. Degnan E. L. Ruden M. H. Frese S. F. Garanin V. N. Mokhov 《Journal of Fusion Energy》2008,27(4):235-240
A method is described for choosing experimental parameters in studies of high-energy-density (HED) physics relevant to fusion
energy, as well as other applications. An important HED issue for magneto-inertial fusion (MIF) is the interaction of metal
pusher materials with megagauss (MG) magnetic fields during liner compression of magnetic flux and fusion fuel. The experimental
approach described here is to study a stationary conductor when a pulsed current generates MG fields at the surface, instead
of studying the inner surface of a moving liner. This places less demand upon the pulsed power system, and significantly improves
diagnostic access. Thus the deceptively simple geometry chosen for this work is that of a z pinch composed of a metal cylinder
carrying large current. Consideration of well known stability issues for the z pinch shows that for given peak current and
rise time from a particular power supply, there is a minimum radius and thus maximum B field that can be created without disruption
of the conductor before peak current. The reasons are reviewed why MG levels of magnetic field, as required for MIF, result
in high temperatures and plasma formation at the surface of the metal in response to Ohmic heating. The distinction is noted
between the liner regime obtained with cylindrical rods, which have a skin depth small compared to the conductor radius, and
the exploding thin-wire regime, which has skin depth larger than the wire radius. A means of diagnostic development is described
using a small facility (DPM15) built at the University of Nevada, Reno. It is argued that surface plasma temperature measurements
in the 10-eV range are feasible based on the intensity of visible light emission. 相似文献
17.
The chemical structure of the organic matter from Krassava oil shale has been investigated by means of chemical degradation with metallic sodium in liquid ammonia and with phenol in the presence p-toluenesulphonic acid. The former reaction yielded 20 wt% of pyridine-soluble material and the latter ≈ 65 wt%. Extensive depolymerization of the oil shale was achieved by a combination of both methods in which case the solubility of the organic matter was increased to 85–95 wt%. The characterization of soluble and insoluble products by pyrolysis g.c. and elemental analysis indicated that aliphatic chains were prevalent in the organic matter of the Krassava oil shale. 相似文献
18.
19.
The paper presents a numerical study on the heat transfer in through-thickness direction of single woven layers, based on the jet system theory. A mathematical model, involving the Reynolds-Averaged Navier-Stokes partial differential equations is used, and two turbulence models (k ? ? and RSM) are applied to solve the closure problem. Numerical results for the temperature distribution, heat rate, heat flux and thermal resistance of the samples are obtained, analyzed, and validated by experimental data. The presented approach for modeling the heat transfer through woven macrostructures is concluded to be a working numerical tool that has the potential to replace costly design iterations and experiments to produce woven textiles with desired performance. 相似文献
20.