Simulation Research of Tapered Sidewall Trench Superjunction MOSFETs

2014 ◽  
Vol 568-570 ◽  
pp. 1196-1200
Author(s):  
Jun Liu ◽  
Li Li ◽  
Yue Yang Liu ◽  
Wen Yu Gao ◽  
Rui Jin ◽  
...  
Keyword(s):  
Process Control ◽  
Breakdown Voltage ◽  
Doping Concentration ◽  
Vertical Sidewall ◽  
Simulation Research ◽  
Charge Imbalance ◽  
Dopant Profile ◽  
Relationship Of ◽  
The Relationship ◽  
Uniform Doping

This paper studied the relationship of breakdown voltage and charge imbalance of 600V tapered sidewall trench superjunction MOSFETs. Simulation structures including three types of structures: 600V vertical sidewall trench superjunction MOSFET (Type1) and 600V tapered sidewall trench superjunction MOSFET (Type2 and Type3). Under the condition of P-column and N-column uniform doping, Type1 structure has the highest peak breakdown voltage. Type2 structure has the lowest peak breakdown voltage under the condition of P-column doping concentration slightly lower than N-column doping concentration. The peak breakdown voltage of structure Type3 is higher than Type2, but the sensitivity of breakdown voltage in the charge imbalance state is the highest. The Gaussian dopant profile in P-column can make the peak breakdown voltage of the tapered sidewall trench superjunction MOSFET achieved the same level of the peak breakdown voltage of the vertical sidewall trench superjunction MOSFET. It is concluded that the sensitivity of breakdown voltage in the charge imbalance state is related to the structure: Type2 structure under the condition of P-column undercompensation and Type3 structure under the condition of P-column overcompensation are both beneficial to the process control.

A Simulation Research for Railroad Freight Car-to-Car End Impact Based on Numerical Analysis

2015 ◽  
Vol 764-765 ◽  
pp. 1020-1025 ◽  
Author(s):  
Meng Qi Ma ◽  
Fang Ping Lei ◽  
Yu Qiao Ren ◽  
Bai Song Mu
Keyword(s):  
Numerical Analysis ◽  
Kinematic Model ◽  
Kutta Method ◽  
Simulation Research ◽  
Runge Kutta Method ◽  
Freight Car ◽  
Runge Kutta ◽  
Relationship Of ◽  
The Relationship ◽  
Railroad Freight

A method of establishing a kinematic model for simulated railroad freight car impact based on the Runge-Kutta method is introduced in this paper. The model is solved based on numerical analysis to obtain the relationship of variables, furthermore providing a basis for determining the loading support and loading securement method.

Study of Fault Location Algorithm Based on Fault Analysis Method

2014 ◽  
Vol 631-632 ◽  
pp. 350-353
Author(s):  
Lu Yi Li ◽  
Rong Li
Keyword(s):  
Fault Location ◽  
Fault Analysis ◽  
Analysis Method ◽  
Simulation Research ◽  
Matlab Simulink ◽  
Electrical Quantity ◽  
Location Algorithm ◽  
Relationship Of ◽  
The Relationship

Analyze and derive the relationship of each electrical quantity of the single-end fault location algorithm and present a fault location formula of two-end fault location algorithm. Through the simulation research of MATLAB/Simulink, when the fault occurs near in either end of the line, the ranging device near the fault point is adopted, fault distance can be measured with single-ended electrical quantities algorithm, when the fault occurred in near the midpoint of the line, two-end fault location algorithm is chosen to ensure the results’ accuracy higher.

Application of X-Ray Fluorescence Analysis to Process Control

1961 ◽  
Vol 5 ◽  
pp. 486-499 ◽  
Author(s):  
F. Bernstein
Keyword(s):  
Particle Size ◽  
Process Control ◽  
Sampling Technique ◽  
Fluorescence Analysis ◽  
Particle Sizes ◽  
X Ray ◽  
Direct Sampling ◽  
Precision And Accuracy ◽  
Relationship Of ◽  
The Relationship

AbstractThe application of X-ray fluorescence-analysis methods to process control is discussed. Various methods of sample preparation are reviewed and compared. The use of the direct sampling technique is discussed and consideration is given to the effects of particle size on precision and accuracy of analytical results. The mechanism of these effects if presented, and some general principles concerning the relationship of fluorescent intensities and particle sizes of pure materials and mixtures are derived. Examples of particle-size effects in cement and mining applications are illustrated.

Simulation Research for Strip Shearing Section Level Distribution

2012 ◽  
Vol 157-158 ◽  
pp. 231-235
Author(s):  
Bing Chen ◽  
Shu Hao Liu ◽  
Jing Yang
Keyword(s):  
Coincidence Degree ◽  
Theory Analysis ◽  
Simulation Research ◽  
Software Simulation ◽  
Simulation Tools ◽  
Shear Process ◽  
Simulation Results ◽  
Relationship Of ◽  
The Relationship ◽  
Section Level

In view of the generally phenomenon of section burr in of disk shearing, through using the theory analysis combined with FEA software simulation tools in article, exploring the relationship between cutting edge coincidence degree, gap shear process. And take the" taking hierarchical method " get the relationship of the coincidence degree, clearance and strip shearing section level proportion on the factors on shear technology. Finally using the theoretical knowledge demonstrates the accuracy of simulation results.

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

Studies on Leukemogenic and Sarcomagenic Viruses

1970 ◽  
Vol 28 ◽  
pp. 156-157
Author(s):  
Leon Dmochowski
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Morphological Properties ◽  
Mode Of Development ◽  
Relationship Of ◽  
The Relationship

Electron microscopy has proved to be an invaluable discipline in studies on the relationship of viruses to the origin of leukemia, sarcoma, and other types of tumors in animals and man. The successful cell-free transmission of leukemia and sarcoma in mice, rats, hamsters, and cats, interpreted as due to a virus or viruses, was proved to be due to a virus on the basis of electron microscope studies. These studies demonstrated that all the types of neoplasia in animals of the species examined are produced by a virus of certain characteristic morphological properties similar, if not identical, in the mode of development in all types of neoplasia in animals, as shown in Fig. 1.

The relationship of IGE receptor topography to signaling activity in RBL-2H3 mast cells

1991 ◽  
Vol 49 ◽  
pp. 236-237
Author(s):  
J.R. Pfeiffer ◽  
J.C. Seagrave ◽  
C. Wofsy ◽  
J.M. Oliver
Keyword(s):  
Mast Cells ◽  
Protein A ◽  
Scattered Electron ◽  
Ige Receptor ◽  
Receptor Complexes ◽  
Ige Binding ◽  
Electron Imaging ◽  
Small Clusters ◽  
Relationship Of ◽  
The Relationship

In RBL-2H3 rat leukemic mast cells, crosslinking IgE-receptor complexes with anti-IgE antibody leads to degranulation. Receptor crosslinking also stimulates the redistribution of receptors on the cell surface, a process that can be observed by labeling the anti-IgE with 15 nm protein A-gold particles as described in Stump et al. (1989), followed by back-scattered electron imaging (BEI) in the scanning electron microscope. We report that anti-IgE binding stimulates the redistribution of IgE-receptor complexes at 37“C from a dispersed topography (singlets and doublets; S/D) to distributions dominated sequentially by short chains, small clusters and large aggregates of crosslinked receptors. These patterns can be observed (Figure 1), quantified (Figure 2) and analyzed statistically. Cells incubated with 1 μg/ml anti-IgE, a concentration that stimulates maximum net secretion, redistribute receptors as far as chains and small clusters during a 15 min incubation period. At 3 and 10 μg/ml anti-IgE, net secretion is reduced and the majority of receptors redistribute rapidly into clusters and large aggregates.

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