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排序方式: 共有140条查询结果,搜索用时 20 毫秒
81.
Evans TE Moyer RA Thomas PR Watkins JG Osborne TH Boedo JA Doyle EJ Fenstermacher ME Finken KH Groebner RJ Groth M Harris JH La Haye RJ Lasnier CJ Masuzaki S Ohyabu N Pretty DG Rhodes TL Reimerdes H Rudakov DL Schaffer MJ Wang G Zeng L 《Physical review letters》2004,92(23):235003
A stochastic magnetic boundary, produced by an applied edge resonant magnetic perturbation, is used to suppress most large edge-localized modes (ELMs) in high confinement (H-mode) plasmas. The resulting H mode displays rapid, small oscillations with a bursty character modulated by a coherent 130 Hz envelope. The H mode transport barrier and core confinement are unaffected by the stochastic boundary, despite a threefold drop in the toroidal rotation. These results demonstrate that stochastic boundaries are compatible with H modes and may be attractive for ELM control in next-step fusion tokamaks. 相似文献
82.
83.
An analysis is made of the print-quality characteristics of multi-copy printing in which a rigid type font indents several layers of paper and carbon paper resting on a rigid platen. Particular attention is given to determining the contact-pressure distributions for two indenter shapes and for layers of various thicknesses. Stress distributions in the layers are computed and, using a stress-failure mechanism for solid ink, the stress distributions are found to agree well with opticalprint density and reflectance measurements obtained from experiments. 相似文献
84.
85.
B. N. Ellison P. L. Schaffer W. Schaal D. Vail R. E. Miller 《International Journal of Infrared and Millimeter Waves》1989,10(8):937-947
A 345GHz superconductor insulator superconductor (SIS) tunnel junction receiver utilizing a full height rectangular waveguide mixer with two tuning elements, i.e. an E-plane and backshort tuner, has been constructed and installed on the Caltech Submillimeter Observatory 10m antenna on Mauna Kea, Hawaii. The receiver exhibits a best double side-band noise temperature response of 150K±20K (averaged over a 500 MHz IF bandwidth centered at 1.5GHz) at a design center frequency of 345GHz and at an ambient temperature of approximately 3.8K. Additional measurements show that the receiver has an excellent response at selected points within an RF input range of 280 to 363GHz. 相似文献
86.
Matthias Pailer Eveline Schaffer Irene Schläger 《Monatshefte für Chemie / Chemical Monthly》1979,110(3):589-592
The synthesis of the ,-unsaturated ketones4, 5 und6
via the regiospecific aldol- andWittigreaction with some indolealdehydes is described.4 and5 are stable enough for NaBH4-reduction to the corresponding alcohols. 相似文献
87.
Minimally disruptive laser-induced breakdown in water 总被引:1,自引:0,他引:1
We produce minimally disruptive breakdown in water by using tightly focused 100-fs laser pulses and demonstrate the potential use of this technique in microsurgery of the eye. Using time-resolved imaging and piezoelectric pressure detection, we measure the magnitude and speed of propagation of the pressure wave produced in the breakdown. Compared with breakdown with longer pulses, here there is a much lower energy threshold for breakdown of 0.2microJ , a smaller shock zone diameter (11microm for 1-microJ pulses), and consistent energy deposition. 相似文献
88.
89.
Schaffer S Weil B Nguyen VD Dongmann G Günther K Nickolaus M Hermann T Bott M 《Electrophoresis》2001,22(20):4404-4422
We present a high-resolution reference map for soluble proteins obtained from Corynebacterium glutamicum cells grown in glucose minimal medium. The analysis window covers the pl range from 4-6 and the molecular mass range from 5-100 kDa. Using overlapping narrow immobilized pH gradients for isoelectric focusing, 970 protein spots were detected after second-dimensional separation on SDS-polyacrylamide gels and colloidal Coomassie-staining. By tryptic peptide mass fingerprinting 169 protein spots were identified, representing 152 different proteins including many enzymes involved in central metabolism (18), amino acid biosynthesis (24) and nucleotide biosynthesis (11). Thirty-five of the identified proteins have no known function. A comparison of the observed and the expected physicochemical properties of the identified proteins indicated that nine proteins were covalently modified, since variants with apparently identical molecular mass, but differing pl were detected. The N-termini of eight proteins were determined by post-source decay (PSD) analysis of selected peptides. In addition to the soluble proteins, a map of the membrane-bound proteins within the pl range 4-7 is presented, which contains 660 protein spots, 22 of which were identified, representing 13 different proteins. 相似文献
90.