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21.
22.
S. Chatterji 《Cement and Concrete Research》1973,3(2):215-217
Experiments with synthetic tobermorite, made from industrial raw materials, showed that 11Å tobermorite can not be rehydrated to any higher hydrate even by storing them in water. 11Å tobermorite can be transformed to lower hydrate by heating at about 300°C. In this transformation the interlayer spacing changes discretely. 相似文献
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24.
Dr. Avisek Mahapa Gopal Ch Samanta Dr. Krishnagopal Maiti Prof. Dipankar Chatterji Prof. Narayanaswamy Jayaraman 《Chembiochem : a European journal of chemical biology》2019,20(15):1966-1976
Lipomannan and lipoarabinomannan are integral components of the mycobacterial cell wall. Earlier studies demonstrated that synthetic arabinan and arabinomannan glycolipids acted as inhibitors of mycobacterial growth, in addition to exhibiting inhibitory activities of mycobacterial biofilm. Herein, it is demonstrated that synthetic mannan glycolipids are better inhibitors of mycobacterial growth, whereas lipoarabinomannan has a higher inhibition efficiency to biofilm. Syntheses of mannan glycolipids with a graded number of mannan moieties and an arabinomannan glycolipid are conducted by chemical methods and subsequent mycobacterial growth and biofilm inhibition studies are conducted on Mycobacterium smegmatis. Growth inhibition of (73±3) % is observed with a mannose trisaccharide containing a glycolipid, whereas this glycolipid did not promote biofilm inhibition activity better than that of arabinomannan glycolipid. The antibiotic supplementation activities of glycolipids on growth and biofilm inhibitions are evaluated. Increases in growth and biofilm inhibitions are observed if the antibiotic is supplemented with glycolipids, which leads to a significant reduction of inhibition concentrations of the antibiotic. 相似文献
25.
Mandal Pratap Chandra Mukherjee Imon Chatterji Biswa Nath 《Multimedia Tools and Applications》2021,80(3):3623-3644
Multimedia Tools and Applications - Data hiding is a noteworthy research topic in digital technology for years. Reversible data hiding (RDH) technique plays a vital role for confirming security of... 相似文献
26.
Seetharam RN Szuchmacher Blum A Soto CM Whitley JL Sapsford KE Chatterji A Lin T Johnson JE Guerra C Satir P Ratna BR 《Nanotechnology》2008,19(10):105504
Wild type, mutant, and chemically modified Cowpea mosaic viruses (CPMV) were studied for long term preservation in the presence and absence of cryoprotectants. Viral complexes were reconstituted and tested via fluorescence spectroscopy and a UV/vis-based RNase assay for structural integrity. When viruses lyophilized in the absence of cryoprotectant were rehydrated and RNase treated, UV absorption increased, indicating that the capsids were damaged. The addition of trehalose during lyophilization protected capsid integrity for at least 7 weeks. Measurements of the fluorescence peak maximum of CPMV lyophilized with trehalose and reconstituted also indicate that the virus remained intact. Microarray binding assays indicated that CPMV particles chemically modified for use as a fluorescent tracer were intact and retained binding specificity after lyophilization in the presence of trehalose. Thus, we demonstrate that functionalized CPMV nanostructures can be stored for the long term, enabling their use in practical sensing applications. 相似文献
27.
M. Patra S. Majumdar S. Giri G. N. Iles T. Chatterji 《Journal of Superconductivity and Novel Magnetism》2011,24(1-2):775-777
We report the magnetocaloric effect (MCE) in a Pr0.52Sr0.48MnO3 single crystal estimated from the isothermal magnetization curve using the Maxwell relation. Isothermal magnetization curves are measured over the range 20 K to 320 K where the field was applied parallel (??) and perpendicular (??) to the [110] direction of the perovskite structure with Pbnm space group. A peak in the temperature (T) dependence of magnetic entropy change (??S M) with a fairly large negative value (???3.3 J/kg?K) is observed at 275 K close to the Curie temperature (T C) for a change in field of ??H=40 kOe. The ?? and ?? components of ??S M deviate from each other below ??260 K and an inverse MCE is observed below ??150 K. We note that the Landau theory of phase transitions satisfactorily explains the ??S M vs T plot around the second-order transition at T C. 相似文献
28.
In commercial practice, two-step ageing is commonly used in Al-Zn-Mg alloys to produce a fine dispersion of η′ precipitates
to accentuate the mechanical properties and resistance to stress corrosion cracking. While this is true in Al-Zn-Mg alloys,
two-step ageing leads to inferior properties in Al-Mg-Si alloys. This controversial behaviour in different alloys can be explained
by Pashley’s Kinetic model. Pashley’s model addresses the stability of clusters after two-step ageing. In the development
of the model, the surface energy term between cluster and matrix is taken into account while the coherency strains between
the cluster and matrix are not considered. In the present work, a model is developed which takes into account the coherency
strains between cluster and matrix and defines a new stability criterion, inclusive of strain energy term. Experiments were
done on AA 7010 aluminium alloy by carrying out a two-step ageing treatment and the results fit the new stability criterion.
Thus it is found that the new model for two-step ageing is verified in the case of Al-Zn-Mg alloy. 相似文献
29.
K. T. Kashyap C. Ramachandra M. Sujatha B. Chatterji 《Bulletin of Materials Science》2000,23(1):39-45
Discontinuous precipitation (DP) occurs in many alloy systems under certain conditions. It is called discontinuous precipitation
because precipitation occurs on prior matrix grain boundaries followed by grain boundary movement. The DP nodule consists
of alternate lamellae of the precipitate and the matrix respectively. The chemical driving force for DP is one of solute supersaturation.
Although solute supersaturation is responsible for precipitation, it has to be coupled with another driving force to explain
grain boundary migration. This coupling driving force has been identified to be diffusional coherency strain which has been
verified to be active in diffusion induced grain boundary migration and liquid film migration.
To test diffusional coherency strain theory for discontinuous precipitation Mg-7Al and Mg-7Al-1Pb alloys were studied. While
the fraction transformed was high at 6% in Mg-7Al alloy, dit was significantly low at 2% in Mg-7Al-1Pb alloy. The velocity
of DP nodules decreased by half in alloy with Pb as compared to the alloy without Pb. Theoretical calculations also predict
that the misfit parameter δth decreases with the addition of Pb. These observations are an evidence to the fact that diffusional coherency strain is the
most active driving force for the movement of the grain boundaries of the DP nodules during discontinuous precipitation in
Mg-Al alloy. 相似文献
30.
The strengthening of particulate reinforced metal-matrix composites is associated with a high dislocation density in the matrix
due to the difference in coefficient of thermal expansion between the reinforcement and the matrix. While this is valid, the
role of work hardening characteristics of the matrix alloys in strengthening of these composites is addressed in the present
paper. It is found that commercial purity aluminium which has the lowest work hardening rate exhibits the highest strength
increment. This effect is due to increased prismatic punching of dislocations. This relationship of decreasing work hardening
rate associated with increasing prismatic punching of dislocations in the order 7075, 2014, 7010, 2024, 6061 and commercial
purity aluminium leading to increased strength increments is noted. 相似文献