A5100773047- Rock Mechanics and Modeling
- GaN-based semiconductor devices and materials
- Semiconductor Quantum Structures and Devices
- Pregnancy and preeclampsia studies
- Air Quality and Health Impacts
- Structural Response to Dynamic Loads
- High-Velocity Impact and Material Behavior
- Semiconductor materials and devices
- Gestational Diabetes Research and Management
- Ga2O3 and related materials
- Drilling and Well Engineering
- ZnO doping and properties
- Birth, Development, and Health
- Tunneling and Rock Mechanics
- Geomechanics and Mining Engineering
- Lung Cancer Treatments and Mutations
- Climate Change and Health Impacts
- Landslides and related hazards
- Hydraulic Fracturing and Reservoir Analysis
- Hemoglobinopathies and Related Disorders
- Metal and Thin Film Mechanics
- Geotechnical and Geomechanical Engineering
- Maternal and fetal healthcare
- Thin-Film Transistor Technologies
- Coal Properties and Utilization
Guizhou Minzu University
2010-2024
Guizhou University
2010-2024
National Health and Family Planning Commission
2017-2024
Zhejiang University
2024
Tianjin Municipal Research Institute for Family Planning
2024
Hohai University
2021-2024
Guizhou Institute of Technology
2023
Chinese Academy of Medical Sciences & Peking Union Medical College
2018-2023
Sichuan Provincial Architectural Design and Research Institute (China)
2023
Northwestern Polytechnical University
2023
Abstract For shaped charge blasting projects in mining, civil engineering, and similar fields, it is proposed to modify the structure by combining slotted tubes liners obtain a new type of structure. This aims achieve directional rock breaking through focused action charge. The influence different pipe materials on rock-breaking effect concentrated energy using explored theoretical analysis combined with model test study, high-speed camera, stress–strain gauge, other equipment. A comparison...
Electron overflow limits the quantum efficiency of InGaN/GaN light-emitting diodes. InGaN electron cooler (EC) can be inserted before growing multiple wells (MQWs) to reduce overflow. However, detailed mechanisms how EC contributes improvement have remained unclear so far. In this work, we theoretically propose and experimentally demonstrate an mean-free-path model, which reveals reduces mean free path in MQWs, increases capture rate also valence band barrier heights turn promoting hole...
Background The effect of second‐hand smoking, especially husband on wife's hypertension has not been well studied. current study was aimed to assess the association smoking with among females aged 20 49 years. Methods and Results This included 5 027 731 along their husbands from National Free Pre‐pregnancy Checkup Projects conducted across 31 provinces in China 2014. Smoking/passive status collected by a standard questionnaire blood pressure measured an electronic device after 10 minutes...
Low-thermal-mass LEDs (LTM-LEDs) are developed and demonstrated in flip-chip configuration, studying both experimentally theoretically the enhanced electrical optical characteristics limits.LT M-LED chips 25×25 μm 2 , 50×50 100×100 200×200 mesa sizes fabricated comparatively investigated.It is revealed that properties improved by chip size due to reduced thermal mass.With a smaller (from 200 50 μm), device generally presents higher current density against voltage power density.However,...
The power supply system of diesel generators is isolated. Sudden loading and unloading will lead to fluctuation the engine speed exert an impact on quality. In order improve stability against impact, this paper proposes a flywheel with variable moment inertia, through adjustment which, can be improved. Imbalance between output torque load cause changes in inertia flywheel. forms internal feedback loop control system, it takes Angular acceleration as input signal its reduces pulse loading....
Globally, severe anemia impacts millions of non-pregnant women. However, studies on the prevalence through large epidemiologic surveys among women have been scarce in China. In this study, we aimed to study and its determinants living rural areas Data were gathered for 712,101 aged between 21 49 years who attended 2012 National Free Preconception Health Examination Project. Severe was defined as a hemoglobin (Hb) concentration lower than 80 g/L. Associated factors analyzed using univariate...
A three-step graded undoped-InGaN layers embedded between the GaN last quantum barrier layer and p-AlGaN electron blocking was proposed its effect on performance of InGaN/GaN light-emitting diodes investigated both experimentally theoretically. In structure, leakage is found to be effectively reduced, while hole injection efficiency simultaneously increased significantly, hence enabling a greatly enhanced radiative recombination rate within active region. As result, improvements 12.25% in...
Evidence of couples' BMI and its influence on birth weight is limited contradictory. Therefore, this study aims to assess the association between couple's preconception risk small for gestational age (SGA)/large (LGA) infant, among over 4·7 million couples in a retrospective cohort based National Free Pre-pregnancy Checkups Project 1 December 2013 30 November 2016 China. Among live births, 256 718 (5·44 %) SGA events 506 495 (10·73 LGA were documented, respectively. After adjusting...
Due to the limitation of hole injection, p-type doping is essential improve performance InGaN/GaN multiple quantum well light-emitting diodes (LEDs). In this work, we propose and show a depletion-region Mg-doping method. Here systematically analyze effectiveness different profiles ranging from electron blocking layer active region. Numerical computations that decreases valence band barrier for holes thus enhances transportation. The proposed approach also increases height electrons, which...
This work proposes an effective electrode length model and reveals for the first time relationship between this mesa shape effect. On basis of model, we demonstrate high-performance triangular miniaturized-LEDs (mini-LEDs) benchmark to conventional square, circular shapes same area. Here, systematically study impact shaping in mini-LEDs both theoretically experimentally, which is fundamentally different than that regular-sized LEDs. We find that, at current level 200 mA, deliver enhancement...
Abstract In order to study the influence of slit structure on blasting effect charge, super dynamic strain test system and photographic equipment were used response charge distribution cracks under different shapes angles. The results show that changing shape does not make energy-gathering damage-reducing cartridge disappear, but it will affect its effect. Compared with round hole slit, peak in direction strip blast is larger, directional crack forming more obvious, better. energy...
<abstract abstract-type="Summary"> <sec> <b>What is already known about this topic?</b> The significance of maternal liver health concerning preterm birth (PTB) well recognized; however, there a gap in understanding the precise influence preconception serum alanine aminotransferase (ALT) levels on risk PTB. </sec><sec> added by report?</b> In retrospective cohort study, J-shaped relationship between ALT and PTB was observed, indicating that both significantly elevated decreased may...
N-GaN/P-GaN/N-GaN/P-GaN/N-GaN (NPNPN-GaN) junctions embedded between the n-GaN region and multiple quantum wells (MQWs) are systematically studied both experimentally theoretically to increase performance of InGaN/GaN light emitting diodes (LEDs) in this work. In proposed architecture, each thin P-GaN layer sandwiched NPNPN-GaN structure is completely depleted due built-in electric field junctions, ionized acceptors these layers serve as energy barriers for electrons from region, resulting a...
In this work, the authors report incorporation of TiW alloy in InGaN/GaN-based flip-chip light-emitting diodes (LEDs). The advantages provided by use are analyzed detail. InGaN/GaN multiple quantum well LEDs with a Ni/Ag/TiW metal stack found to tolerate high-temperature annealing better than those Ni/Ag stack. Highly improved current–voltage characteristics and enhanced optical output power achieved for devices thin layer. These changes ascribed higher reflectivity, smoother surface, ohmic...
To examine the associations between macrosomia risk and exposure to fine particulate matter (PM2.5) its chemical components during pregnancy, we collected birth records 2010 2015 in mainland China from National Free Preconception Health Examination Project used satellite-based models estimate concentrations of PM2.5 mass five main components, namely, black carbon (BC), organic (OC), nitrate (NO3–), sulfate (SO42–), ammonium (NH4+). Associations prenatal were examined by logistic regression...
Abstract The shape of a charge liner used in shaped charges with combined will greatly influence the blasting effect. In this study, we examined how liners different shapes affected directional rock blasting, and assessed mechanism. numerical simulation results showed that among three liners, arc triangular performed significantly better than flat‐top liner, was slightly superior to arc‐shaped liner. Model testing indicated principal cracks developed along energy‐gathering direction, while...