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排序方式: 共有10000条查询结果,搜索用时 484 毫秒
941.
K. Tsuzuki T. Banno A. Kinbara Y. Nakagawa T. Tsukada 《Journal of Nuclear Materials》1993,200(3):291-295
The self-bias potential (Vdc) induced on an RF-powdered electrode (153 mm Ø) in a plasma is measured using electrical probes which are buried in, de-insulated from, and RF-connected to the electrode. The configuration of the probes allows to study the distribution of Vdc discretely on the electrode. The potential is homogeneous in the absence of external magnetic field. In the presence of a homogeneous magnetic field parallel to the electrode, it is reduced and a monotonous gradient takes place in its distribution due to the plasma shift induced by E × B drift. When the magnetic field is rotated along the axis of the RF-electrode at a frequency less than 50 Hz, the distribution, which is almost identical to the one in a static field, rotates with the magnetic field. On the coordinate system rotating with the magnetic field, the probes are regarded to be rotating. The potential distribution is obtained as a continuous function of the azimuthal angle. Thus the rotation of the field provides information for the experimental interpolation. 相似文献
942.
The tone sense multiaccess with partial collision detection (TSMA/PCD) protocol is particularly suitable for a packet satellite system serving an area with a dense population of earth stations. By incorporating a narrowband ground radio channel for broadcasting busy ones, the earth stations are able to avoid packet collisions by sensing for the absence of busy tones before transmitting packets. Partial collision detection capability can also be achieved. Single-tone TSMA/PCD gives 97% of the carrier-sense multiaccess with collision detection (CSMA/CD) throughput when N =10 tones are used, while for multitone and slot-by-slot announcement TSMA/PCD protocols only N =8 and N =2, respectively, are sufficient to drive the system to the CSMA/CD performance 相似文献
943.
944.
对弹性杆与水下壳体接触冲击问题进行了研究,用有限元法模拟壳体,边界无法模拟无限域流体,通过温面上的耦合条件进行联立求解,文中给出了典型算例,并进行了有关讨论。 相似文献
945.
R.M. Scanlan W.A. Barletta D. Dell'Orco A.D. McInturff A. Asner E.W. Collings P.F. Dahl H. Desportes A. Devred R. Garre E. Gregory W. Hassenzahl M. Lamm D. Larbalestier D. Leroy P. McIntyre J. Miller T. Shintomi H. ten Kate S. Wipf 《Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment》1996,380(3):544-554
946.
947.
Inertia and Change in the Early Years: Employment Relations in Young, High Technology Firms 总被引:2,自引:0,他引:2
HANNAN MICHAEL T.; BURTON M. DIANE; BARON JAMES N. 《Industrial and Corporate Change》1996,5(2):503-536
This paper considers processes of organizational imprintingin a sample of 100 young, high technology companies. It examinesthe effects of a pair of initial conditions: the founders' modelsof the employment relation and their business strategies. Ouranalyses indicate that these two features were well alignedwhen the firms were founded. However, the alignment has deterioratedover time, due to changes in the distribution of employmentmodels. In particular, the star model and commitmentmodel are less stable than the engineering modeland the factory model. Despite their instability,these two blueprints for the employment relation have strongeffects in shaping the early evolution of these firms. In particular,firms that embark with these models have significantly higherrates of replacing the founder chief executive with a non-founderas well as higher rates of completing an initial public stockoffering. Some implications of these findings for future studiesof imprinting and inertia in organizations are discussed. 相似文献
948.
M. Bennahmias H. B. Radousky T. J. Goodwin R. N. Shelton 《Journal of Electronic Materials》1993,22(10):1189-1193
Magnetic characterization has been performed on the members of the cuprateniobate RBa2Cu2NbO8 (R = Pr, Nd, and La) series and R1.5Ce0.5Sr2Cu2NbO10 (R = Pr, Eu, Nd, and Sm) series. The PrBCNO samples show a signature in the magnetization of a magnetic ordering at 12K.
The PrCSCNO sample is nonsuperconducting and shows two distinct orderings at 17K and 53K. No such magnetic phase transition
is observed down to 2K in the Nd and La based RBCNO materials or the Nd, Sm, and Eu based RCSCNO materials. Measurements of
the lower critical field curve, dc irreversibility line, and critical curent densities are reported for each of the superconducting
NdCSCNO, SmCSCNO, and EuCSCNO compounds. 相似文献
949.
950.
The concept of moving surface boundary-layer control, as applied to a Joukowsky airfoil, is investigated through a planned
experimental programme complemented by numerical studies. The moving surface was provided by rotating cylinders located at
the leading edge and/or trailing edge as well as top surface of the airfoil. Results suggest that the concept is quite promising,
leading to a substantial increase in lift and a delay in stall. Depending on the performance desired, appropriate combinations
of cylinder geometry, location and speed can be selected to obtain favourable results over a wide range of angle of attack.
Next, effectiveness of the concept in reducing drag of bluff bodies such as a two-dimensional flat plate at large angles of
attack, rectangular prisms and three-dimensional models of trucks is assessed through an extensive wind tunnel test-programme.
Results show that injection of momentum through moving surfaces, achieved here by introduction of bearing-mounted, motordriven,
hollow cylinders, can significantly delay separation of the boundary-layer and reduce the pressure drag. The momentum injection
procedure also proved effective in arresting wind-induced vortex resonance and galloping type of instabilities. A flow visualization
study, conducted in a closed-circuit water tunnel using slit lighting and polyvinyl choride tracer particles, adds to the
wind-tunnel and numerical investigations. It shows, rather dramatically, the effectiveness of the moving surface boundary-layer
control (MSBC).
The Sabita Chaudhury Memorial Lecture
The models were fabricated in the Mechanical Engineering Workshop. The assistance of M/s E Abell, P Hurren and D Camp in the
design and construction of the models is gratefully acknowledged. The investigation was supported by the Natural Sciences
and Engineering Research Council of Canada, Grant No. A-2181. 相似文献