全文获取类型
收费全文 | 180篇 |
免费 | 6篇 |
专业分类
化学工业 | 78篇 |
金属工艺 | 3篇 |
机械仪表 | 4篇 |
建筑科学 | 4篇 |
矿业工程 | 1篇 |
能源动力 | 3篇 |
轻工业 | 33篇 |
水利工程 | 2篇 |
无线电 | 6篇 |
一般工业技术 | 23篇 |
冶金工业 | 18篇 |
原子能技术 | 2篇 |
自动化技术 | 9篇 |
出版年
2023年 | 4篇 |
2022年 | 7篇 |
2021年 | 13篇 |
2020年 | 3篇 |
2019年 | 3篇 |
2018年 | 6篇 |
2017年 | 4篇 |
2016年 | 4篇 |
2015年 | 4篇 |
2014年 | 4篇 |
2013年 | 11篇 |
2012年 | 5篇 |
2011年 | 4篇 |
2010年 | 7篇 |
2009年 | 5篇 |
2008年 | 12篇 |
2007年 | 3篇 |
2006年 | 7篇 |
2005年 | 5篇 |
2004年 | 6篇 |
2003年 | 5篇 |
2002年 | 6篇 |
2001年 | 3篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1998年 | 3篇 |
1997年 | 7篇 |
1996年 | 9篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 4篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1984年 | 5篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 3篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有186条查询结果,搜索用时 15 毫秒
71.
Jadwiga Konefał-Góral Anna Małek Stanisława Kluska Witold Jastrzębski Sławomir Zimowski Stanisława Jonas Jerzy Lis 《Materials Science-Poland》2013,31(3):476-483
This work reports the results concerning formation and tribological properties of SiC x N y (H) layers deposited on Ti Grade 2 and polyurethane foil. Depending on the substrate, two variants of PACVD were used. The SiC x N y (H) layers on titanium were deposited with application of MWCVD (2.45 GHz, 2 kW). The layers on polyurethane were deposited using RFCVD (13.56 MHz, 400 W). Good adhesion between the SiC x N y (H) layers and polymeric foil was achieved by formation of a transitional C:N:H layer and incorporating Si gradient into the structure of the SiC x N y (H) layer. The chemical composition of the layers was tailored by precise control of the gaseous precursors ratios: [SiH4]/[NH3], [SIH4]/[NH3]/[CH4], [SiH4]/[CH4] or [SiH4]/[N2]/[CH4]. The structure and chemical composition of the obtained layers were subjected to further studies (FTIR, SEM/EDS). The roughness, friction coefficient and wear resistance were also measured. The results show that SiC x N y (H) layers offer attractive tribological properties which make them good candidates for various applications, including biomedical devices. 相似文献
72.
73.
Vladimir M. Gun’ko Oleksandr P. Kozynchenko Stephen R. Tennison Roman Leboda Jadwiga Skubiszewska-Zięba Sergey V. Mikhalovsky 《Carbon》2012,50(9):3146-3153
Detailed analysis of nanopores (IUPAC micropores at pore half-width x < 1 nm) of carbonised porous phenolformaldehyde resin microbeads used as a precursor of activated carbon (AC) and CO2 activated carbon (at 50% burn-off) has been performed on the basis of high-resolution transmission electron microscopy (HRTEM) image analysis and nitrogen adsorption data analysed using several density functional theory (DFT) methods. The results of quenched solid DFT (QSDFT) and nonlocal (NLDFT) are in agreement with the pore size distributions of nanopores based on the HRTEM image analysis. Development of porosity with progressive activation degree in a series of ACs leads to enhancement of the deviation of the pore shape from the used pore models. The TG/DTA data and Raman spectra show nonlinear but weak changes in the AC characteristics with increasing burn-off degree. 相似文献
74.
Jadwiga Mielcarek Agnieszka Matłoka Paweł Grobelny 《Drug development and industrial pharmacy》2013,39(9):861-869
Photoproducts of hexahydroquinoline derivatives have been analyzed with gas chromatography electro ionization-mass spectrometry (GC-EI-MS) and high performance chromatography electrospray ionization-mass spectrometry (HPLC-ESI-MS). The study was performed on four HHQ derivatives: 2,6,6-trimethyl-3-carbomethoxy-5-oxo-4-(R-phenyl)-1,4,5,6,7,8-hexahydroquinoline; R=2′-Me, 3′-Me, 2′-MeO, and 3′-MeO. The photochemical degradation of each of the HHQ derivatives led to the appearance of one product. The photoproducts were identified as the corresponding tetrahydroquinoline analogues, which were formed by dehydrogenation of dihydropyridine moiety. In GC-mass spectra, the most frequent way of fragmentation was elimination of CH3* or CH3O* radical of the ester group. In the photoproducts substituted at 2′-position of the phenyl ring, elimination of isobutene (C4H8) was observed. In the photoproducts with 3′-position substituents, elimination of COOCH3* radical was noted. 相似文献
75.
Jadwiga Sadowska Wioletta Błaszczak Stanisław Konopka Józef Fornal Wojciech Rybiński 《International Journal of Food Properties》2013,16(4):814-825
The seeds of grass pea were selected based on their size, hardness, and microstructure in order to examine their mechanical properties and friction coefficients versus mass. The size, shape, mass, and static friction coefficients of seeds were determined using adequate methods. Seed hardness was measured using compression methods, and it was described by typical and corrected fracture parameters. The microstructure of cotyledons and seed surfaces was viewed using scanning electron microscopy, and surface microimages were processed by digital image analysis. The length of the examined seeds ranged from 5.86 mm to 14.25 mm, their width ranged from 5.47 mm to 12.93 mm, thickness from 4.59 mm to 6.21 mm, mass from 0.110 g to 0.570 g, projected area from 28.55 mm2 to 148.73 mm2, and roundness from 1.060 to 1.126. The static friction coefficients for seeds of the examined accessions and varieties determined on steel, wood, rubber, and PVC surfaces were 23.4–33.3°, 24.4–37.2°, 29.6–50.4°, and 22.4–35.4°, respectively. For grass pea seeds of irregular size and shape, corrected fracture energy values (with regard to seed mass and volume) were proposed as a more robust parameter of seed hardness. The values of the static friction coefficient depend on both seed mass and the microstructural properties of seed surface digitalized with the involvement of image analysis techniques. 相似文献
76.
Wioletta?B?aszczakEmail author Jadwiga?Sadowska Cristina?M.?Rosell Józef?Fornal 《European Food Research and Technology》2004,219(4):348-354
The influence of fungal and bacterial -amylases on the texture and microstructure of dough and bread was investigated. Loaf specific volume, crumb porosity and texture properties were accepted as bread structure and texture characteristics. The microstructure analysis of dough and bread using light and scanning microscopy methods was performed.The changes in loaf specific volume, crumb porosity and texture properties showed different anti-staling activity of the enzymes used. The simultaneous action of enzyme addition and the fermentation process evoked significant changes in the microstructure of dough. The character of these changes depended on the kind of enzyme used. A substantial effect of both amylases on starch behaviour during bread baking and staling was also observed. 相似文献
77.
The objective of this article was to determine the structure of microbial communities and the activity of dehydrogenases in soil samples contaminated with four polycyclic aromatic hydrocarbons (PAHs), i.e., naphthalene, phenanthrene, anthracene, and pyrene, in the amount of 0, 1000, 2000, and 4000 mg kg?1soil DM. Organic substances—cellulose, sucrose, and compost—were added to the samples in the amount of 0 and 9 g kg?1soil DM. The experiment was performed in a laboratory on samples of loamy sand. Indices of colony development (CD) and eco-physiological diversity (EP) of organotrophic bacteria, soil resistance (RS), and soil resilience (RL) were calculated. Soil contamination with PAHs differentiated the structure of organotrophic bacteria, and the lowest CD and EP values were noted in soil samples containing pyrene. PAHs inhibited the activity of dehydrogenases, and pyrene exerted the most inhibitory effect on enzyme activity. Dehydrogenase activity was determined mainly by the applied PAH dose, the date of analysis and the type of organic substance added to soil. Low RL values indicate that exposure to PAHs induces long-term changes in dehydrogenase activity. 相似文献
78.
Effect of ground corn steeping on starch properties 总被引:1,自引:0,他引:1
Monica Haros Wioletta Blaszczak Oscar E. Perez Jadwiga Sadowska Cristina M. Rosell 《European Food Research and Technology》2006,222(1-2):194-200
Pasting and thermal properties, and microstructure of starch from ground corn (GS) steeped at 52 °C in sulphurous acid solution
(0.20%) at different steep times (8, 16, 24, 32 and 40 h) were investigated. The isolated starch obtained by wet milling was
characterised by determining pasting properties in Rapid Visco Analyser (RVA), retrogradation enthalpy in differential scanning
calorimetry (DSC), and microstructure of granules in light (LM) and scanning electron microscopy (SEM). Milling before steeping
and long steep time caused reduction in peak, hot paste, cool paste, breakdown and setback viscosities. Steep time provoked
an increase in the retrogradation temperatures (onset and peak), whereas no significant differences were found in retrogradation
enthalpy. Microstructure characteristics analysed by SEM showed many cracks and cavities on surface in samples steeped 8 h,
whereas samples steeped 40 h showed a great alteration and disruption of their inner layer. LM with polarised light confirmed
that starches retained birefringence with several differences depending on the steep time. The use of ground kernels allowed
a better steep solution–endosperm interaction, which caused changes in rheological, thermal and microstructural starch characteristics. 相似文献
79.
80.
Research on water scarcity and water management in Europe has accelerated significantly in the past two decades, mainly as a result of growing water demand for agricultural, industrial, and municipal uses. Most research studies in the field evaluate water use and management by means of static indicators that depict a one-time value for a given time period (e.g., one year). This paper suggests a dynamic indicator measuring product (here: water) generational dematerialization. The indicator presents a comprehensive approach for evaluating water resources and water management strategies, as it represents a function of both resource use changes and population changes occurring simultaneously and over time. To accentuate the benefits of this dynamic indicator over static indicators as well as its practical applicability for decision-making support, the paper evaluates water management in Europe based on the total water use between 2001 and 2013. The results show that water management estimated cumulatively for the analyzed European countries has been effective for the last 13 years, though significant regional variations have been found. The research and the dynamic water generational dematerialization indicator can be helpful with addressing regional and national water deficit problems and designing sustainable water management strategies in the mid- and long-run. 相似文献