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Journal of Modern Power Systems and Clean Energy 2021年第1期9卷 199-209页

作者： Muhammad Najwan Hamidi Dahaman Ishak Muhammad Ammirrul Atiqi Mohd Zainuri Chia Ai ooi Tarmizi Tarmizi the School of Electrical and Electronic Engineering Universiti Sains MalaysiaNi-bong TebalMalaysia the Department of Electrical Electronic and System EngineeringUniversiti Kebangsaan MalaysiaBangiMalaysia the Department of Electrical Engineering University Syiah KualaBanda AcehIndonesia

In this paper, a perturb and observe(P&O) based voltage regulator(POVR) and a capacitor compensator(CC)circuit are proposed for the implementation on 31-level asymmetrical switch-diode based multi-level DC-link(MLDCL) inverter. Since the application of MLDCL in a standalone photovoltaic(PV) system requires constant DC voltages from PV panels, the POVR strategy is deployed to regulate the voltage along with the capability to deliver the maximum power at full *** DC-DC converters are used as the interface between the panels and the inverter for the POVR operation. The results show that POVR is capable of achieving the desired fixed DC voltages even under varying environmental and load conditions,with a steady 230 V at the output. At full load, the standalone system successfully delivers 97.21% of the theoretical maximum power. Additionally, CC is incorporated to mitigate voltage spikes at the output when supplying power to inductive *** successfully eliminates the spikes and also reduces the total harmonic distortion(THD) of output current and voltage from more than 10% to less than 5%, as recommended in IEEE 519 standard.

关键词： Multi-level inverter photovoltaic(PV)system maximum power point voltage regulator capacitor compensator(CC)

Paraventricular Nucleus P2X7 Receptors Aggravate Acute Myocardial Infarction Injury via ROS-Induced Vasopressin-V1b Activation in Rats

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Neuroscience Bulletin 2021年第5期37卷 641-656页

作者： Wenjing Cheng Yinggang Sun Qin Wu Kokwin ooi Yi Feng Chunmei Xia Danian Zhu Department of Physiology and Pathophysiology School of Basic Medical SciencesFudan UniversityShanghai 200032China Department of Cardiovascular Diseases Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200092China Department of Medical Technology Jiangsu Vocational College of MedicineYancheng 224005China Department of Integrative Medicine and Neurobiology School of Basic Medical SciencesFudan UniversityShanghai 200032China

The present study was designed to investigate the mechanisms by which P2X7 receptors(P2X7Rs)mediate the activation of vasopressinergic neurons thereby increasing sympathetic hyperactivity in the paraventricular nucleus(PVN) of the hypothalamus of rats with acute myocardial ischemia(AMI). The left anterior descending branch of the coronary artery was ligated to induce AMI in rats. The rats were pretreated with BBG(brilliant blue G, a P2X7R antagonist), nelivaptan(a vasopressin V1b receptor antagonist), or diphenyleneiodonium(DPI) [an nicotinamide adenine dinucleotide phosphate(NADPH)oxidase inhibitor]. Hemodynamic parameters of the heart were monitored. Myocardial injury and cardiomyocyte apoptosis were assessed. In the PVN of AMI rats, P2X7R mediated microglial activation, while reactive oxygen species(ROS) and NADPH oxidase 2(NOX2) were higher than in the sham group. Intraperitoneal injection of BBG effectively reduced ROS production and vasopressin expression in the PVN of AMI rats. Moreover, both BBG and DPI pretreatment effectively reduced sympathetic hyperactivity and ameliorated AMI injury, as represented by reduced inflammation and apoptosis of ***, microinjection of nelivaptan into the PVN improved cardiac function and reduced the norepinephrine(AE) levels in AMI rats. Collectively, the results suggest that, within the PVN of AMI rats, P2X7R upregulation mediates microglial activation and the overproduction of ROS, which in turn activates vasopressinergic neuron V1b receptors and sympathetic hyperactivity, hence aggravating myocardial injury in the AMI setting.

关键词： PVN P2X7 receptor Vasopressin Reactive oxygen species c-fos Myocardial ischemia

Tunable passively Q-switched ytterbium-doped fiber laser with mechanically exfoliated GaSe saturable absorber

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Chinese Optics Letters 2018年第2期16卷 93-97页

作者： H.Ahmad S.N.Aidit S.I.ooi Z.C.Tiu Photonics Research Centre University of Malaya

A tunable passively Q-switched ytterbium-doped fiber laser using few-layer gallium selenide（GaSe） as a saturable absorber（SA） is *** few-layer GaSe SA,which is fabricated by the mechanical exfoliation method,is able to generate a Q-switched fiber laser that has a maximum repetition rate of 92.6 kHz and a minimum pulsed width of 2.3 μ*** highest pulse energy exhibited by the generated pulse is 18.8 nJ with a signal to noise ratio of ~40 *** tunability of the proposed laser covers from 1042 to 1082 nm,giving a tuning range of 40 nm.

关键词： Tunable passively Q-switched ytterbium-doped fiber laser with mechanically exfoliated GaSe saturable absorber SA

Phenol photocatalytic degradation over mesoporous TUD-1-supported chromium oxide-doped titania photocatalyst

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Chinese Journal of Catalysis 2016年第11期37卷 1871-1881页

作者： Yee Khai ooi Leny Yuliati Siew Ling Lee 马来西亚工艺大学理学院化学系马来西亚新山81310 马来西亚工艺大学科学与工业研究所可持续纳米材料中心马来西亚新山81310

Mesoporous Technische Universiteit Delft（TUD-1）-supported chromium oxide-doped titania（Cr-TiO2） was developed as a promising photocatalyst for phenol photodegradation under visible light ***-angle X-ray diffraction and Fourier transform infrared spectroscopy results confirmed the amorphous and mesoporous silicate framework of TUD-1 in TUD-1-supported *** mesostructure of TUD-1 was further verified via N2 adsorption-desorption analysis,which showed a type-IV isotherm with a narrow average pore size distribution of 3.9 nm and high surface area of 490 m^2/*** electron microscopy analysis results indicated that TUD-1-supported Cr-TiO2 contained nanoparticles and porous *** increase in band gap energy was observed after loading Cr-TiO2 into *** with that of unsupported Cr-TiO2,TUD-1-supported Cr-TiO2 showed higher photocatalytic activity for phenol degradation under visible light *** TUD-1 supported Cr-TiO2 photocatalyst with a Si/Ti molar ratio of 30 exhibited the highest photodegradation of phenol（82%） of the prepared *** photodegradation of phenol by the supported catalyst followed the Langmuir adsorption isotherm with first-order kinetics.

关键词： Phenol TUD-1 Titania Photocatalyst Mesoporous

Aspartate aminotransferase-immunoglobulin complexes in patients with chronic liver disease

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World Journal of Gastroenterology 2005年第10期11卷 1529-1531页

作者： Masahiko Tameda Katsuya Shiraki Kinue ooi Koujirou Takase Yoshitane Kosaka Tsutomu Nobori Yukihiko Tameda Department of Clinical Laboratory Medicine The First Department of Internal Medicine

AIM: To determine the complex of AST and immunoglobulin and to investigate its clinical significance in patients with liver ***: The complex of AST and immunoglobulin was determined by encounter immunoelectrophoresis and its clinical significance was investigated in 128 patients with liver ***: AST was bound to immunoglobulin of antiimmunoglobulin A (IgA) class, but any binding to antiimmunoglobulin G and anti-immunoglobulin M classes was not observed. Although the incidence of ASTimmunoglobulin complex was 41.8% in chronic hepatitis (CH), the incidences in liver cirrhosis and hepatocellular carcinoma were 62.2 and 90.0%, respectively. In alcoholic liver disease with high level of serum IgA, the incidence of the complex was 66.7%, which was higher than that in CH. The ratio of binding to lambda-chain of IgA was higher than that to kappa-chain of IgA. The serum level of IgA and the ratio of AST/alanine aminotransferase (ALT) were significantly higher in patients with AST-IgA complex than in those without ***: These results suggest that AST-IgA complex in patients with progressive liver diseases and alcoholic liver injury can lead to elevation of the ratio of AST/ALT.

关键词： Alcoholic liver disease Aspartate aminot-ransferase AST/ALT Chronic hepatitis Chronic liver disease Hepatocellular carcinoma Immunoglobulin Liver cirrhosis

Real-time remote monitoring system for crop water requirement information

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International Journal of Agricultural and Biological Engineering 2014年第6期7卷 37-46页

作者： Han Wenting Xu Zhiqing Zhang Yang Cao Pei Chen Xiangwei Su Ki ooi Institute of Water Saving Agriculture in Arid regions of China Northwest A&F UniversityYangling 712100China Kunming Shipbuilding Equipment Co.Ltd. Kunming 650236China College of Mechanical and Electronic Engineering Northwest A&F UniversityYangling 712100China College of Food Science and Engineering Northwest A&F UniversityYangling 712100China National ICT Australia Victoria Research Lab.Department of Electrical and Electronic EngineeringThe University of MelbourneParkvilleVIC 3010Australia

Rapidly acquiring and real-time transmitting crop water requirement information constitute the basis for achieving intelligent diagnosis and precision *** order to collect and transmit crop water requirement information at real time,a new microcontroller-based real-time remote monitoring system was designed,including system hardware design,software and anti-jamming *** system achieved the functions including clock reading,information configuration,LCD display,keyboard control,data sending and receiving,multi-channel information acquisition,conversion and *** and field tests showed that the system can achieve data acquisition and real-time display of the crop water requirement *** the current weather station,the system collects crop water information,meteorological factors and soil parameters at the same *** has a high level of stability and acquisition accuracy,and can meet the requirements for real-time remote monitoring of the crop water requirement information for irrigation decision-making.

关键词： crop water requirement information collection microcontroller real time monitoring irrigation decision making

基于多边形比例边界有限元的复合材料裂纹扩展模拟

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工程力学 2014年第7期31卷 1-7页

作者：施明光徐艳杰钟红 Ean Tat ooi 张楚汉清华大学水沙科学与水利水电工程国家重点实验室北京100084 大连理工大学海岸和近海工程国家重点实验室大连116024 新南威尔士大学土木与环境工程系

该文采用近年提出的多边形比例边界有限元(Polygon Scaled Boundary Finite Elements,PSBFE),结合基于拓扑的局部网格重剖分方法,首次模拟了层状复合材料交界面、不同弹性模量的圆形夹杂对复合材料裂纹扩展的影响。结果表明,该文方法可... 详细信息

该文采用近年提出的多边形比例边界有限元(Polygon Scaled Boundary Finite Elements,PSBFE),结合基于拓扑的局部网格重剖分方法,首次模拟了层状复合材料交界面、不同弹性模量的圆形夹杂对复合材料裂纹扩展的影响。结果表明,该文方法可以有效模拟复合材料的裂纹扩展,算例的结果同现有文献的实验数据和数值模拟结果吻合良好,采用不同网格密度和不同裂纹扩展步长对计算结果影响不大。基于SBFEM的PSBFE可以半解析求解裂纹尖端应力奇异性,具有比FEM更高的精度。另一方面,同现有基于SBFEM的裂纹扩展方法相比,基于拓扑的局部网格重剖分的PSBFE可以处理任意复杂的二维模型,具有更好的通用性。

关键词：断裂力学裂纹扩展比例边界有限元网格重剖分应力强度因子

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Easy removing of phenol from wastewater using vegetable oil-based organic solvent in emulsion liquid membrane process

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Chinese Journal of Chemical Engineering 2017年第1期25卷 45-52页

作者： Norasikin Othman Norul Fatiha Mohamed Noah Lim Yin Shu Zing-Yi ooi Norela Jusoh Mariani Idroas Masahiro Goto Centre of Lipids Engineering and Applied Research (CLEAR) Ibnu Sina Institute for Scientuific and Industrial Research (Ibnu Sina ISIR) Universiti Teknologi Malaysia 81310 UTM Johor BahruJohor Malaysia Faculty of Chemicul and Energy Engineering Universiti Teknologi Malaysia 81310 UTM Johor BahruJohor Malaysia Department of Applied Chemistry Graduate School of Engineering Kyushu University 744 Motooka Nishi-ka Fukuoka-shi fukuoka 819-0395Japan

Phenol is considered as pollutant due to its toxicity and carcinogenic ***,variety of innovative methods for separation and recovery of phenolic compounds is developed in order to remove the unwanted phenol from wastewater and obtain valuable phenolic *** of potential method is extraction using green based liquid organic ***,the feasibility of using palm oil was *** this research,palm oil based organic phase was used as diluents to treat a simulated wastewater containing 300×10^(-6) of phenol solution using emulsion liquid membrane process(ELM).The stability of water-in-oil(W/O) emulsion on diluent composition and the parameters affecting the phenol removal efficiency and stability of the emulsion;such as emulsification speed,emulsification time,agitation speed,surfactant concentration,pH of external phase,contact time,stripping agent concentration and treat ratio were carried *** results of ELM study showed that at ratio7 to 3 of palm oil to kerosene,5 min and 1300 r·min^(-1) of emulsification process the stabile primary emulsion were ***,no carrier is needed to facilitate the phenol *** experimental conditions of500 r·min^(-1) of agitation speed,3%Span 80,pH 8 of external phase,5 min of contact time,0.1 mol·L^(-1) NaOH as stripping agent and 1:10 of treat ratio,the ELM process was very promising for removing the phenol from the *** extraction performance at about 83%of phenol was removed for simulated wastewater and an enrichment of phenol in recovery phase as phenolate compound was around 11 times.

关键词： Vegetable palm oil-based Liquid membrane Phenol removal Wastewater

Pulmonary sequestration:diagnosis by magnetic resonance angiography and computed tomography

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Chinese Medical Journal 1999年第7期000卷 92-94页

作者： GC ooi CW Cheung WK Lam

ＧＣＯｏｉ，ＣＷＣｈｅｕｎｇ，ＷＫＬａｍａｎｄＫＷＴＴｓａｎｇＤｅｐａｒｔｍｅｎｔｓｏｆＤｉａｇｎｏｓｔｉｃＲａｄｉｏｌｏｇｙ（ＯｏｉＧＣａｎｄＣｈｅｕｎｇＣＷ）ａｎｄＭｅｄｉｃｉｎｅ（ＬａｍＷＫａｎｄＴｓａｎｇＫＷ... 详细信息

ＧＣＯｏｉ，ＣＷＣｈｅｕｎｇ，ＷＫＬａｍａｎｄＫＷＴＴｓａｎｇＤｅｐａｒｔｍｅｎｔｓｏｆＤｉａｇｎｏｓｔｉｃＲａｄｉｏｌｏｇｙ（ＯｏｉＧＣａｎｄＣｈｅｕｎｇＣＷ）ａｎｄＭｅｄｉｃｉｎｅ（ＬａｍＷＫａｎｄＴｓａｎｇＫＷＴ），ＴｈｅＵｎｉｖｅｒｓｉｔｙｏ...

关键词： magnetic sequestration resonance and Pulmonary

Biobrane^(TM) for burns of the pubic region: minimizing dressing changes

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Military Medical Research 2019年第1期6卷 89-92页

作者： Jia-Jun Feng Jia Le See Abby Choke Adrian ooi Si Jack Chong Department of Plastic Reconstructive and Aesthetic Surgery Singapore General Hospital University of Auckland Faculty of Medical and Health Sciences

Background: The pubic region is often involved in accidental hot water or soup-spill burns. Most of these wounds are superficial partial thickness burns. Due to their proximity to the urinary system, as well as vaginal and anal openings,these burns are easily contaminated. Daily dressings are routinely prescribed as the sole treatment. The cumbersome dressing process is uncomfortable and embarrassing for patients. Biobrane^(TM) is a bilayered biosynthetic dressing. Its coverage of superficial partial thickness burns promotes wound healing and allows one-time *** presentations: We report two patients who suffered superficial dermal burns over their pubic region. One patient had 23% total body surface area(TBSA) burns over her lower abdomen, both thighs and pubic region. The second patient had 10% TBSA burns that involved her perineum and the medial sides of both thighs and *** were managed with the standard resuscitation protocol in the initial phase. Their burn injuries were managed by shaving, Foley catheterization and Biobrane^(TM) coverage. Their wounds healed uneventfully without *** epithelization was achieved by post-operative day seven. Both patients consented to medical photography and academic ***: Shaving and catheterization improved the hygiene of the burns of the pubic area. The Biobrane^(TM)method circumvents the need of regular dressing changes, eliminating the pain due to dressing changes and preserving patient dignity.

关键词： Pubic Thermal burns Perineum Dressing BiobraneTM