1.3 kV Vertical GaN-Based Trench MOSFETs on 4-Inch Free Standing GaN Wafer

In this work, a vertical gallium nitride (GaN)-based trench MOSFET on 4-inch free-standing GaN substrate is presented with threshold voltage of 3.15 V, specific on-resistance of 1.93 mΩ·cm2, breakdown voltage of 1306 V, and figure of merit of 0.88 GW/cm2. High-quality and stable MOS interface is obtained through two-step process, including simple acid cleaning and a following (NH4)2S passivation. Based on the calibration with experiment, the simulation results of physical model are consistent well with the experiment data in transfer, output, and breakdown characteristic curves, which demonstrate the validity of the simulation data obtained by Silvaco technology computer aided design (Silvaco TCAD). The mechanisms of on-state and breakdown are thoroughly studied using Silvaco TCAD physical model. The device parameters, including n−-GaN drift layer, p-GaN channel layer and gate dielectric layer, are systematically designed for optimization. This comprehensive analysis and optimization on the vertical GaN-based trench MOSFETs provide significant guide for vertical GaN-based high power applications.

A New Method for Calculating the Cementation Exponent of Triple-Porosity Media Reservoirs

The value of a cementation exponent, usually obtained by rock and electricity experiments, significantly affects the calculation of water saturation, thickness of the hydrocarbon reservoir, and recovery rate. The determination of the cementation exponent for porous-media reservoirs has been a challenge because of the limited core sampling. A new method was proposed to determine the value of cementation exponent for complex triple-porosity media reservoirs in the work. Firstly, the work discussed the effects of fractures and nonconnected vugs on the cementation exponent of the reservoir as well as the calculation method of the cementation exponent of the dual-porosity media reservoir. Then, a new model for calculating the cementation exponent of triple-porosity media reservoirs was derived by combining the Maxwell-Garnett theory and series-parallel theory, which matched with the real physical-experiment data of rocks. The results showed that the fractures decreased the cementation exponent of the reservoir but the vugs increased. The mixture of matrix pores, fractures, and vugs made the value of the cementation exponent of the triple-porosity media reservoir vary around 2.0. The conductivity of the triple-porosity media reservoir was the external macroscopic expression of the microscopic conductive network. The new calculation model of the cementation exponent proposed in the work could reasonably predict the cementation exponent of the strongly inhomogeneous triple-porosity media reservoir.

Comparative study of construction of divergence of wind field based on OLR data obtained from – polar orbiting and geostationary satellites

An assessment of Outgoing longwave radiation data obtained from polar orbiting and geostationary satellites is made to see which one, is more convenient and useful for the construction of divergence of the wind field for regional models. The availability of OLR data from TIROS-N (polar orbiting) and GOES-IO (geostationary) satellites during 1979 made it possible to assess and explore a statistical relationship among the OLR data and divergence of the wind field at 850 and 2°9 hPa. constructed from the analysls of the Global Experiment data sets. This study reveals a very strong relationship between these fields in the region of deep convective activity and this relationship has also been found to be stronger for geostationary satellite than polar orbiting satellite. The use or this relationship especially over data-sparse tropical oceanic regions for NWP models is suggested.

LiDAR Odometry by Deep Learning-based Feature Points with Two-step Pose Estimation

KITTI dataset is collected from three types of environments, i.e., country, urban and highway The types of feature point cover a variety of scenes. The KITTI dataset provides 22 sequences of LiDAR data. 11 sequences of them from sequence 00 to sequence 10 are "training" data. The training data are provided with ground truth translation and rotation. In addition, field experiment data is collected by low-resolution LiDAR, VLP-16 in Wuhan Research and Innovation Center.

LiDAR Odometry by Deep Learning-based Feature Points with Two-step Pose Estimation

KITTI dataset is collected from three types of environments, i.e., country, urban and highway The types of feature point cover a variety of scenes. The KITTI dataset provides 22 sequences of LiDAR data. 11 sequences of them from sequence 00 to sequence 10 are "training" data. The training data are provided with ground truth translation and rotation. In addition, field experiment data is collected by low-resolution LiDAR, VLP-16 in Wuhan Research and Innovation Center.

Oriental Ethnic Mind: Ways to Represent It in Translation from Buryat into Russian

The urgency and topicality of the research is due to an insufficient study of zoom-investigating into a pre- and post-translation mental stage, and of ways to identify or forecast the authors mind ethno-centered content. Hereby the objective of the study is to describe ways of representing the oriental ethnic mind in translation from Buryat into Russian. To implement it, the following tasks are solved: to prove the conceptual difference of the Buryat mind within three dimensions the experimental axiological data on the semantic space of three generations of modern Buryats are presented, the main vectors of oriental Buryat mind are determined, the given axiological observations are confirmed on the basis of a literary text material, the author being a conservatively orientally-minded author by himself, and a number of ways to represent the Buryat ethnic mind in translation into Russian are discussed, and their correlated correspondences (ir)relevance issue is respectively raised. The materials are as follows: the semantic differential experiment data and Dambinima Tsyrendashievs story Һuhlshyn uulzalga Last meeting. The research methods are a psycholinguistic experiment, a posttranslation analysis of the target text in Russian, an algorithm presentation of the source text ethnocentered semantics explication at the pre-translation stage which is presented in the conclusion.

STUDY OF FROUDE AND HUGHES METHODS BY NUMERICAL TOWING TANK

The resistance of a cargo ship is calculated by numerical towing tank. RANSE multi-phase parallel solver with K-Z SSTturbulent model and VOF formulation is applied. Computational results from double model (without free surface) areused to obtain 1+k in Hughes’ method and those with free surface are analyzed by both Froude and Hughes’ approachesto investigate model and full scale correlation. ITTC recommended uncertainty study is carried out to evaluate numericalerror due to grid density. The computed wave elevation, wake distribution and resistance components by fine, mediumand coarse meshes are cross-compared and validated against experiment data where applicable. It is found that gridresolution has most effect on wave pattern. The predicted friction and viscous-pressure resistance coefficients arerelatively grid independent from present numerical simulation.

Scheme Design and Data Analysis of Critical Physical Experiment for Hexagonal Casing Type Fuel Reactor

Based on the requirement of Hexagonal Casing Type Fuel Reactor (HCTFR) nuclear design and the critical physical experiment design method introduced by a single factor, 11 core critical physical experiments are proposed to validate the calculation accuracy and reliability of the nuclear design code CPLEV2. The experiment loading scheme fully takes into account the various components and more than one irradiate hole in the HCTFR core, which is used as critical physical experiment schemes successfully. According to the critical physical experiment data, the reactivity calculation deviations of all critical physical experiments are within ±1.0%. The validation results show that the nuclear design code CPLEV2 has high calculation accuracy and reliability for the core of hexagonal casing type fuel, and it can be used for HCTFR nuclear design.