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1.
S. Brabetz R. Weidl F. Klemm L. Dörrer F. Schmidl P. Seidel 《Journal of Low Temperature Physics》1997,106(3-4):527-532
We investigated different types of high-Tc DC-SQUID gradiometers with the aim to develop an one-channel heart monitoring system for non-invasive measurements in unshielded
environment. This system could be used to obtain information about the patients condition in serial examinations and in emergency
cases fast and stable. Step-edge and bicrystal Josephson junctions were used to prepare planar galvanically coupled thin film
gradiometers and magnetometers. These sensors were used to carry out measurements in well-shielded and non-shielded environment
and we compared the different noise properties and field gradient resolutions. With different types and sizes of high-Tc DC-SQUID sensors magnetocardiograms were measured in a magnetically shielded room. The influence of antenna configurations,
SQUID parameters, and cooling conditions on the measurement of magnetocardiograms will be discussed. We investigated possibilities
to suppress the earth magnetic field (with pairs of Helmholtz coils) and for noise field compensation in unshielded environment. 相似文献
2.
boundary conditions. A cell structure which is independent to the nodes is used to evaluate the integrals of EFG 相似文献
3.
CuIn5Se8 homogeneous crystals of n-type conductivity have been grown. Donor centers activation energy has been estimated. In/n-CuIn5Se8 Schottky barriers have been created and the first spectral dependencies of quantum efficiency of photoconversion of these structures have been derived. The nature of interband optical transitions has been interpreted and the band gap values for direct and indirect transitions in CuIn5Se8 crystals have been determined on the results of analysis of the Schottky barriers photoactive edge absorption. A possibility of utilization of CuIn5Se8 crystals in wide-band photoconverters of the optical radiation has been established. 相似文献
4.
为了掌握高Al2O3条件下(w(Al2O3)为15%以上)高炉渣系的熔化特性,利用差式扫描量热仪分析了不同w(MgO)/w(Al2O3)、碱度(R)以及w(Al2O3)对高铝高炉渣的熔化温度及熔化热的影响。试验结果表明,炉渣熔化开始温度为1 248~1 291 ℃、熔化结束温度为1 432~1 485 ℃、熔化热为137~211 J/g;当w(Al2O3)=15%、高w(MgO)/w(Al2O3)时,发生了共晶逆反应,导致高炉炉渣熔化开始温度逐渐降低,但由于高炉炉渣的液相线温度基本未变,所以炉渣熔化结束温度基本未发生改变;w(Al2O3)为20%时,随着w(MgO)/w(Al2O3)的增加,炉渣中易生成熔点较高的镁铝尖晶石,导致高炉炉渣熔化开始温度逐渐增大,与此同时,炉渣液相线温度逐渐降低,导致炉渣熔化结束温度逐渐降低;随着碱度R的增加,高炉炉渣中生成了具有高熔点的化合物、炉渣的液相线温度升高,使得高炉炉渣的熔化开始温度逐渐增加、炉渣熔化结束温度逐渐升高;随着w(Al2O3)的增加,发生了共晶逆反应,故炉渣的熔化开始温度逐渐降低,而随着w(Al2O3)的增加,炉渣中键能较大的Al—O键增多,需要在更高温度下才能实现炉渣的最终熔化,即熔化结束温度逐渐增加;随着w(MgO)/w(Al2O3)、R以及w(Al2O3)的增加,炉渣熔化热逐渐增多。分析认为,随着R的增加,炉渣中有高熔点化合物的生成,熔化热增加;随着炉渣中w(Al2O3)的增加,炉渣中Al—O键增多,解聚破坏熔渣结构消耗的热量增多;而随着w(MgO)/w(Al2O3)增加,高熔点化合物的生成或熔化开始温度降低,造成熔化热增加。 相似文献
5.
Phosphorus modification of ZSM-5 leads to extra framework P5+ and probably incorporation of +3 valence state of P in the framework. The resulting system has increased Brønsted acidity. Theoretical calculations also favour the postulate that phosphorus in +3 valence state can be incorporated into the lattice. 相似文献
6.
Methanol extracts of the green algaUlva pertusa contain four kinds of glycerolipids that are active as feeding-stimulants for marine herbivorous gastropods. These compounds are digalactosyldiacylglycerol (DGDG), 1,2-diacylglycerly-4w2043171124/xxlarge8242.gif" alt="prime" align="BASELINE" BORDER="0">-O-(N,N,N-trimethyl)-homoserine (DGTH), 1-monoacylglyceryl-4'-O-(N,N,N-trimethyl)-homoserine (MGTH), and 6-sulfoquinovosyldiacylglycerol (SQDG). The various gastropods exhibit marked specificity, however, as young abaloneHaliotis discus respond to DGDG and DGTH at minute dosages of 20–30 w2043171124/xxlarge956.gif" alt="mgr" align="MIDDLE" BORDER="0">g/sample zone, but do not respond to 300 w2043171124/xxlarge956.gif" alt="mgr" align="MIDDLE" BORDER="0">g of SQDG, which is a phagostimulant for two other kinds of gastropods,Turbo comutus andOmphalius pfeifferi.Chemical Studies on Phagostimulants for Marine Gastropods. Part VI. For Part V, see Sakata et al. (1986b). 相似文献
7.
Short syntheses of (Z)-7-dodecen-1-yl acetate, (Z)-7-tetradecen-1-yl acetate, (Z)-9-dodecen-1-yl acetate, and (Z)-9-tetradecen-1-yl acetate from 7-hydroxyheptanal and 9-oxononanoic acid precursors obtained by oxidative cleavage of easily available aleuritic acid are reported. The key step in these syntheses is a stereoselective Wittig reaction between aldehyde and alkyl-phosphonium salt. Wittig-Horner type reaction of 7-hydroxyheptanal and diethyl cyanomethylphosphonate gave the w10775652622p203/xxlarge945.gif" alt="agr" align="BASELINE" BORDER="0">,w10775652622p203/xxlarge946.gif" alt="beta" align="MIDDLE" BORDER="0">-unsaturated nitrile derivative which after protection of the hydroxyl group was reduced to the corresponding aldehyde. Wittig reaction of the latter, followed by acetylation, completed the synthesis of (E,Z)-7,9-dodecadien-1-yl acetate, the sex pheromone of the European grapevine mothLobesia botrana Schiff. 相似文献
8.
In-situ EXAFS studies of sulphided Mo/TiO2 catalysts have shown that at low Mo loadings (2–4 wt%), an active species with a short Mo-S distance of 2.25 Å is formed, while on Mo/TiO2 with high Mo loadings as well as on Mo/w45/xxlarge947.gif" alt="gamma" align="MIDDLE" BORDER="0">-Al2O3, bulk MoS2 (Mo-S, 2.42 Å) is formed. The species with the short Mo-S distance has Mo in an oxidation state close to 6 + and is likely to result from the sulphidation of the tetrahedral molybdate species present in the oxidic precursor at low Mo loadings. The calcination temperature of the oxidic precursor appears crucial, a high calcination temperature of 973 K favouring the formation of MoS3 on sulphidation, and a low calcination temperature of 623 K favouring MoS2.Contribution No. 790 from the Solid State and Structural Chemistry Unit. 相似文献
9.
挤压后硼酸铝晶须增强铝复合材料表面的腐蚀特征 总被引:1,自引:0,他引:1
利用原于力显微镜观察了挤压态Al18B4O33 w/pure Al复合材料早期腐蚀过程中表面形貌的变化特征.研究了沿与挤压方向成不同角度截取的Al18B4O33 w/pure Al复合材料在3.5%NaCl溶液中的腐蚀规律.结果表明:晶须与基体的界面是腐蚀易于发生的地方.点蚀首先在晶须的端部产生,随后沿着晶须与基体的界面扩展.挤压后沿与挤压方向成不同角度截取的Al18B4O33 w/pure Al复合材料表面腐蚀坑的深度存在差别. 相似文献
10.
K. F. Loe 《The Visual computer》1996,12(1):18-25
A linear singular blending (LSB) technique can enhance the shape—control capability of the B-spline. This capability is derived from the blending parameters defined at the B-spline control vertices and blends LSB line segments or bilinear surface patches with the B-spline curve or surface. Varying the blending parameters between zero and unity applies tension for reshaping. The reshaped curve or surface retains the same smoothness properties as the original B-spline; it possesses the same strict parametric continuities. This is different from the w04k063/xxlarge946.gif" alt="beta" align="MIDDLE" BORDER="0">-spline, which introduces additional control to the B-spline by imposing geometrical continuities to the joints of curve segments or surface patches. For applications in which strict parametric continuities cannot be compromised, LSB provides an intuitive way to introduce tension to the B-spline. 相似文献