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排序方式: 共有62条查询结果,搜索用时 78 毫秒
21.
Khor Soo Wei Lee Yean Kee Abas Mhd Radzi Bin Tay Kheng Soo 《Journal of Sol-Gel Science and Technology》2017,82(3):834-845
Journal of Sol-Gel Science and Technology - This study demonstrated the application of chalcone-based dithiocarbamate derivative as metal capturing ligand for the removal of mercury ion (Hg2+) in... 相似文献
22.
It is shown that the linear current flow regime in two-dimensional, two-component textures is unstable for some critical values
of the ratio of the linear conductivities of the components. The critical current and critical field are studied as functions
of the parameters of the system. The possibility of observing the predicted effect experimentally is discussed.
Pis’ma Zh. éksp. Teor. Fiz. 64, No. 7, 495–499 (10 October 1996) 相似文献
23.
24.
Shi Xunqing John HL Pang Yang Qianjin Wang Zhiping Nie Jingxu 《Acta Mechanica Sinica》2002,18(4):356-367
In the present study, a facility, i.e., a mechanical deflection system (MDS), was established and applied to assess the long-term
reliability of the solder joints in plastic ball grid array (BGA) assembly. It was found that the MDS not only quickly assesses
the long-term reliability of solder joints within days, but can also mimic similar failure mechanisms in accelerated thermal
cycling (ATC) tests. Based on the MDS and ATC reliability experiments, the acceleration factors (AF) were obtained for different
reliability testing conditions. Furthermore, by using the creep constitutive relation and fatigue life model developed in
part I, a numerical approach was established for the purpose of virtual life prediction of solder joints. The simulation results
were found to be in good agreement with the test results from the MDS. As a result, a new reliability assessment methodology
was established as an alternative to ATC for the evaluation of long-term reliability of plastic BGA assembly.
The project supported by the National Natural Science Foundation of China (59705008) 相似文献
25.
26.
Y. J. Leng S. H. Chan K. A. Khor S. P. Jiang 《Journal of Solid State Electrochemistry》2006,10(6):339-347
Development of high performance cathodes with low polarization resistance is critical to the success of solid oxide fuel cell
(SOFC) development and commercialization. In this paper, (La0.8Sr0.2)0.9MnO3 (LSM)–Gd0.2Ce0.8O1.9(GDC) composite powder (LSM ~70 wt%, GDC ~30 wt%) was prepared through modification of LSM powder by Gd0.2Ce0.8(NO3)
x
solution impregnation, followed by calcination. The electrode polarization resistance of the LSM–GDC cathode prepared from
the composite powder was ~0.60 Ω cm2 at 750 °C, which is ~13 times lower than that of pure LSM cathode (~8.19 Ω cm2 at 750 °C) on YSZ electrolyte substrates. The electrode polarization resistance of the LSM–GDC composite cathode at 700 °C
under 500 mA/cm2 was ~0.42 Ω cm2, which is close to that of pure LSM cathode at 850 °C. Gd0.2Ce0.8(NO3)
x
solution impregnation modification not only inhibits the growth of LSM grains during sintering but also increases the triple-phase-boundary
(TPB) area through introducing ionic conducting phase (Gd,Ce)O2-δ, leading to the significant reduction of electrode polarization resistance of LSM cathode. 相似文献
27.
H. S. O. Chan M. Y. B. Teo E. Khor C. N. Lim 《Journal of Thermal Analysis and Calorimetry》1989,35(3):765-774
Thermogravimetry (TG) has been conducted on a series of electroconducting acid-doped polyanilines. The weight loss results suggest that the majority of dopants are eliminated between 230 °C to 350 °C leaving behind the skeletal non-conducting polyaniline. The doped polyaniline are thermally more stable than the pristine polyaniline in air at high temperatures. This suggests that despite the early elimination observed, the presence of dopant at the begining has a stabilizing effect on the skeletal polyaniline. By comparison the acid-doped polyanilines are more thermally stable than many other electroconductive polymers, such as polypyrroles and polyacetylenes.
Zusammenfassung An einer Reihe von elektrisch leitenden säureversetzten Polyanilinen wurden thermogravimetrische (TG) Untersuchungen durchgeführt. Die Gewichtsverluste zeigen, daß die Mehrzahl der Zusätze bei einer Temperatur zwischen 230 °C und 350 °C eliminiert werden, wobei die nichtleitenden Polyaniline zurückbleiben. Bei hohen Temperaturen ist das versetzte Polyanilin in Luft thermisch stabiler als das ursprüngliche Polyanilin. Das bedeutet, daß eine anfängliche Gegenwart der Zusätze ungeachtet der frühen Eliminierung einen stabilisierenden Effekt auf das Polyanilingerüst ausübt. Im Vergleich erwiesen sich säureversetzte Polyaniline als thermisch stabiler als andere elektrisch leitende Polymere wie z. B. Polypyrrole oder Polyazethylene.
, . , 230–350°, . , . , , . , - , , , .相似文献
28.
A. M. Satanin S. V. Khor’kov V. V. Skuzovatkin 《Journal of Experimental and Theoretical Physics》1997,85(2):351-359
We study the effect of a weak nonlinearity in media on the linear regime of current flow in two-dimensional periodic structures
with two equal component concentrations. We find that the asymptotic behavior of the electric field and current as functions
of the distance between the angles in heterogeneous media is determined by the parameter h=σ
2/σ
1 (here σ
1 and σ
2 are the linear conductivities of the cells) and the external magnetic field B. This dependence leads to divergence of the higher-order moments of field and current at certain critical values h
c and B
c and to divergence of the response functions related to the higher-order moments. For square cells the effective nonlinear
conductivity diverges at h⩽h
c, with
. For structures of general shape we find the dependence of h
c on the angles and the external magnetic field. We show that for a given structure the linear regime of current flow in the
system can be reversibly transformed into a nonlinear one by varying the magnetic field strength. The critical field B
c is approximately determined from the condition ω
c
τ∼1, where ω
c and τ
−1 are, respectively, the cyclotron frequency and the collision rate. Finally, we discuss the feasibility of detecting these
effects experimentally.
Zh. éksp. Teor. Fiz. 112, 643–660 (August 1997) 相似文献
29.
30.
An electrochemical immuno-biosensor for detecting glycosylated haemoglobin (HbA1c) is reported based on glassy carbon (GC) electrodes with a mixed layer of an oligo(phenylethynylene) molecular wire (MW) and an oligo(ethylene glycol) (OEG). The mixed layer is formed from in situ-generated aryl diazonium cations. To the distal end of the MW, a redox probe 1,1'-di(aminomethyl)ferrocene (FDMA) was attached followed by the covalent attachment of an epitope N-glycosylated pentapeptide (GPP), an analogon to HbA1c, to which an anti-HbA1c monocolonal antibody IgG can selectively bind. HbA1c was detected by a competitive inhibition assay based on the competition for binding to anti-HbA1c IgG antibodies between the analyte in solution, HbA1c, and the surface bound epitope GPP. Exposure of the GPP modified sensing interface to the mixture of anti-HbA1c IgG antibody and HbA1c results in the attenuation of ferrocene electrochemistry due to free antibody binding to the interface. Higher concentrations of analyte led to higher Faradaic currents as less anti-HbA1c IgG is available to bind to the electrode surface. It was observed that there is a good linear relationship between the relative Faradaic current of FDMA and the concentration of HbA1c from 4.5% to 15.1% of total haemoglobin in serum without the need for washing or rinsing steps. 相似文献