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1.
M. Ksiazek N. Sobczak B. Mikulowski W. Radziwill B. Winiarski M. Wojcik 《Journal of Materials Science》2005,40(9-10):2513-2517
The subject of the work was to study the effect of Ti thin film on alumina ceramic on mechanical strength and fracture character of Al2O3/Al/Al2O3 joints. The joints were formed by liquid state bonding of alumina substrates covered with titanium thin film of 800 nm thickness using Al interlayer of 30μm thickness at temperature of 973 K in a vacuum of 0.2 mPa for 5 min. The bend strength was measured by four–point bending test at room temperature. Scanning and transmission electron microscopy were applied for detailed characterization of interface structure and failure character of fractured joint surfaces. Result analysis has shown that application of the Ti thin film on alumina leads to decrease of bond strength properties of Al2O3/Al/Al2O3 joints along with the change either of structure and chemistry of interface or of failure character. 相似文献
2.
Synthesis of Novel Phosphonic‐Type Activity‐Based Probes for Neutrophil Serine Proteases and Their Application in Spleen Lysates of Different Organisms 下载免费PDF全文
Dr. Renata Grzywa Dr. Ewa Burchacka Maria Łęcka Dr. Łukasz Winiarski Maciej Walczak Agnieszka Łupicka‐Słowik Dr. Magdalena Wysocka Prof. Timo Burster Dr. Kamila Bobrek Dr. Keri Csencsits‐Smith Prof. Adam Lesner Dr. Marcin Sieńczyk 《Chembiochem : a European journal of chemical biology》2014,15(17):2605-2612
Neutrophils are a type of granulocyte important in the “first line of defense” of the innate immune system. Upon activation, they facilitate the destruction of invading microorganisms by the production of superoxide radicals, as well as the release of the enzymatic contents of their lysozymes. These enzymes include specific serine proteases: cathepsin G, neutrophil elastase, proteinase 3, as well as the recently discovered neutrophil serine protease 4 (NSP4). Under normal conditions, the proteolytic activity of neutrophil proteases is tightly regulated by endogenous serpins; however, this mechanism can be subverted during tissue stress, thereby resulting in the uncontrolled activity of serine proteases, which induce chronic inflammation and subsequent pathology. Herein, we describe the development of low‐molecular‐weight activity‐based probes that specifically target the active sites of neutrophil proteases. 相似文献
3.
The current paper addresses the problem of 2-D modelling of the onset of failure process in a layered composite with periodic
array of interfacial cracks under static compression along layers. The statement of the problem is based on the most accurate
approach, the model of piecewise-homogenous medium. The condition of plane strain state is considered. The shear and the extensional
buckling modes are examined. The laminae are modelled by transversally isotropic material (a matrix reinforced by continuous
parallel fibres). The complex non-classical failure mechanics problem is solved utilizing finite element analysis. It is found
that the 0°-plies volume fraction, the crack length and the mutual position of cracks influence the critical strain in the composite. 相似文献
4.
Marzena Gawrysiak-Witulska Jolanta Wawrzyniak Antoni Ryniecki Juliusz Perkowski 《Journal of Stored Products Research》2008,44(4):360-365
Environmental microbiologists frequently use ergosterol, a fungal-specific membrane lipid, as an indicator of fungal infection in grain and other plant materials. Microbiological loading and technological quality of barley was determined directly after harvest, after post-harvest drying, and during storage. The conventional plate count method was used to measure fungal contamination (CFU). Ergosterol concentration (ERG) was determined by extraction, saponification and quantification using high-performance liquid chromatography (HPLC) with UV detection. The laboratory malting method was used to determine technological quality of the malt. Results showed a significant correlation between ERG and CFU (the coefficient of correlation was 0.92). Analyses also indicated that the high germinative energy and technological quality of the malt produced from dried barley was retained. 相似文献
5.
G Malm O Ringdén M Anvret U von D?beln L Hagenfeldt B Isberg S Knuutila I Nennesmo J Winiarski C Marcus 《Canadian Metallurgical Quarterly》1997,86(5):484-492
Three children with adrenoleukodystrophy (ALD) underwent allogeneic bone marrow transplantation (BMT) between 1992 and 1993. The first boy had attention deficits, marked neuropsychological deficits and widespread demyelination in the frontal lobes on MRI before transplantation. Four years later he has mentally deteriorated and the demyelination on MRI has progressed. The second boy had no symptoms but had white matter lesions on MRI when diagnosed. He was regularly followed with MRI and neuropsychological investigations until BMT 18 months later. A progress of the lesions was noted on the initial MRI investigations, and 4 months before BMT a worsening of deficits in attention and kinaesthetic praxis could be observed. He rapidly deteriorated after the transplantation and died 18 months later. Both PCR and in situ hybridization confirmed the presence of donor cells in the brain. The third boy had no symptoms but white matter lesions on MRI when diagnosed. The neuropsychological tests remained normal but a slight progress was observed on MRI just before transplantation. This boy is still healthy 3.5 years after BMT. BMT as treatment for ALD has to be considered very early, even if a child without symptoms but signs of demyelination on MRI, if a suitable donor is available. 相似文献
6.
S Carlens O Ringdén M Remberger B L?nnqvist H H?gglund S Klaesson J Mattsson BM Svahn J Winiarski P Ljungman J Aschan 《Canadian Metallurgical Quarterly》1998,22(8):755-761
We retrospectively compared the changes in serum albumin concentration and colloid osmotic pressure between survivors and nonsurvivors of prolonged (> or = 7 days) critical illness over a 2-year period from 1 July 1995. All patients had serum albumin measured daily, and colloid osmotic pressure measured 5 days a week, throughout their ICU admission. They received crystalloid and colloid infusions as well as parenteral or enteral feeding. Infusions of albumin were not used to treat hypoalbuminaemia. One hundred and forty-five patients were included, 66 nonsurvivors and 79 survivors. Nonsurvivors were significantly older than survivors [mean (95% CI): 58 (3.8) and 49 (4.1) years, respectively] and had a greater risk of death [mean (95% CI): 0.44 (0.06) and 0.28 (0.05); p < 0.05]. There was no significant difference in gender, APACHE II score [mean (95% CI): 22 (2.7) (nonsurvivors); 18 (2.3) (survivors)] or length of stay [median (interquartile range): 14 (9-27) days (nonsurvivors); 15 (9-26) days (survivors)]. There was no difference between the two groups in the absolute minimum serum albumin concentrations reached, the time to reach that minimum or the minimum in the first 7 days. However, nonsurvivors had a significantly lower mean serum albumin concentration: [mean (95% CI): 15.7 (5.1) g.l-1 compared with 18.3 (4.6) g.l-1 in survivors; p < 0.05]. They also had a lower recovery mean (the weighted mean after the minimum value): [mean (95% CI): 13.3 (5.1) g.l-1 (nonsurvivors) and 18.6 (5.3) g.l-1 (survivors); p < 0.01]. Analysis of colloid osmotic pressure results showed no difference between the groups in mean, minimum or recovery mean. Regression analysis of mean colloid osmotic pressure and albumin revealed that albumin only contributed 17% of the colloid osmotic pressure in these patients. The similar decrease in albumin in nonsurvivors and survivors may reflect the acute inflammatory response and/or haemodilution. However, survivors showed an ability to increase serum albumin concentrations, possibly owing to resumption of synthesis. The colloid osmotic pressure varied little between or within either group of patients, possibly because of the use of artificial colloids. There was no relationship between death and colloid osmotic pressure. 相似文献
7.
SNOB is a small CAD system, developed for the statical analysis and partial design of buildings of cross-wall construction. It is particularly suited for the design of large precast panel blocks of flats. This paper is a case study of its development, during which great attention was paid to controlled growth, user comfort, effectiveness and economy. 相似文献
8.
A 24 factorial experiment program was carried out to study the main and interaction effects of four factors (mixture CTMABr/SiO2, H2O/SiO2, and EthAc/SiO2, and reaction time) on pore ordering, hexagonal unit cell parameter a0, and morphology of MCM-41. The MCM-41 was synthesized from a sodium silicate solution using cetyltrimethylammonium bromide
(CTMABr) surfactant and ethyl acetate (EthAc) pH modifier. None of the factors acted independently to determine pore ordering,
in contrast to earlier limited literature data, which suggested a higher CTMABr/SiO2 disturbs the assembly of the MCM-41 structure. However, there is no contradiction between these results considering that
the poorly ordered product was obtained previously from a reaction mixture with the higher EthAc/SiO2 and lower H2O/SiO2, which are shown to hinder pore ordering. A combination of these factors, resulting in a higher concentration of acetic acid
(hydrolysis of EthAc), and thus, in a lower mixture alkalinity, implies that the pH affects pore ordering in MCM-41. This
is consistent with extensive literature data on this mesoporous material. A small (up to ∼5%) variation of a0 due to the reaction composition and time variation was insignificant compared to the reported doubling of a0 caused by the effects of varying the surfactant alkyl chain length, addition of swelling organic compounds, or hydrothermal
restructuring. Particle morphology (hexagonal platelets, gyroids, and crescent-like or worm-shaped particles) depended on
the combination of mixture CTMABr/SiO2, H2O/SiO2, and EthAc/SiO2. This is consistent with the literature evidence that morphogenesis of hexagonally ordered silica is a complex phenomenon
involving a variety of reaction variables. 相似文献
9.
This issue contains papers presented at the 7th International Conference on Electrical and Related Properties of Organic Solids (ERPOS-7). It is a companion issue to Vol. 6. No. 5/6 which contained the bulk of the papers. Unfortunately, not all of the papers could be published in one special issue. © 1997 John Wiley & Sons, Ltd. 相似文献
10.
Ida Borgh Peter Hedström Joakim Odqvist Annika Borgenstam John Ågren Ali Gholinia Bartlomiej Winiarski Philip J. Withers George E. Thompson Ken Mingard Mark G. Gee 《Acta Materialia》2013,61(13):4726-4733
In the present work, the size distribution and shape of WC grains in cemented carbides (WC–Co), with different Co contents, have been investigated in three dimensions. Direct three-dimensional (3-D) measurements, using focused ion beam serial sectioning and electron backscattered diffraction (EBSD), were performed and a 3-D microstructure was reconstructed. These measurements were supplemented by two-dimensional (2-D) EBSD and scanning electron microscopy on extracted WC grains. The data from 2-D EBSD collected on planar sections were transformed to three dimensions using a recently developed statistical method based on an iterative inverse Saltykov procedure. This stereological analysis revealed that the assumed spherical shape of WC grains during the Saltykov method is reasonable and the estimated 3-D size distribution is qualitatively in good agreement with the actual distribution measured from 3-D EBSD. Although the spherical assumption is generally fair, the WC grains have both faceted and rounded surfaces. This is a consequence of the relatively low amount of liquid phase during sintering, which makes impingements significant. Furthermore, the observed terraced surface structure of some WC grains suggests that 2-D nucleation is the chief coarsening mechanism to consider. 相似文献