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Enhancement of Large Renewable Distributed Generation Penetration Levels at the Point of Common Coupling

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Energy Engineering 2022年第6期119卷 2711-2744页

作者： Akinyemi Ayodeji Stephen kabeya Musasa Innocent Ewean Davidson Department of Electrical Power Engineering Durban University of TechnologyDurban4000South Africa

The occurrence of distortion and over voltage at the Point of Common Coupling(PCC)of Renewable Distributed Generation(RDG)limits its penetration levels to the power system and the RDG integration is expected to play a crucial role in power system *** its penetrations to be sustained without disconnection from the system,there must be a solution to the voltage rise,distortion,unbalanced current and grid reactive power control strategy at *** is an IEEE-1547 requirement that RDG integration to the power system should be regulated at PCC to avoid disconnection from the network due to power quality *** integration must meet up with this specification to uphold power quality and avoid damage to the sensitive equipment connected at *** this paper,voltage rise,unbalanced current,reactive power and distortion are being managed at PCC while Distribution Network(DN)accepts more RDG penetration levels without violation of the IEEE and South Africa grid code *** Power Filter and Full Bridge Multi-Level Converter(FBMC)are considered to safeguard power quality to the grid,they are modelled in MATLAB/SIMULINK and the results obtained shown that the proposed strategy can successfully regulate voltage rise,distortion,unbalanced current and continuously improve power quality with RDG integration at *** proposed method’s key innovation is the strategic generation and absorption of reactive power to curtain an overvoltage,reverse power flow,and distortion at the PCC,allowing more RDG penetration levels to the grid without disconnection while maintaining the standard requirement for power quality at the *** simulation outcomes validate the superiority of the FBMC over the active power filter with respect of reactive power generation/absorption,dynamic response,and damping capability.

关键词： Electrical circuit reactive power voltage rise distortion and power quality

Evapotranspiration Characteristics of a Lowland Dry Evergreen Forest in Central Cambodia Examined Using a Multilayer Model

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Journal of Water Resource and Protection 2009年第5期1卷 325-335页

作者： Tatsuhiko NOBUHIRO Akira SHIMIZU Katsunori TANAKA Koji TAMAI Naoki kabeya Eriko ITO Takanori SHIMIZU makoto ARAKI Sophal CHANN 不详

Development pressure has led to serious deforestation on the Indochina Peninsula. Particularly rapid defor-estation has occurred in easily accessible lowland areas, and it is thus important to accumulate knowledge about these forests immediately. We measured evapotranspiration rates for a lowland dry evergreen forest in Kampong Thom Province, central Cambodia, using the energy balance Bowen ratio (EBBR) method based on meteorological data collected from a 60-m-high observation tower. Daily evapotranspiration was higher during the dry season than during the rainy season of the Asian monsoon climate. The seasonal variation in evapotranspiration generally corresponded to the seasonal difference in the vapor pressure deficit. A multi-layer model was used to simulate the seasonal variation in evapotranspiration. The multilayer model also reproduced the larger evapotranspiration rate in the dry season than in the rainy season. However, observed values substantially exceeded model-calculated results during certain periods at the beginning of the dry season and in the late dry season. Moreover, during the rainy season, the model tended to overestimate evapotranspiration. The differences between these observed and simulated values may have been caused by seasonal characteristics of photosynthesis and transpiration in the lowland dry evergreen forest that were not considered in the model simulation.

关键词： Cambodia Energy Balance Bowen Ratio Method Evapotranspiration Lowland Dry Evergreen Forest Multilayered Model

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非瓣膜病心房颤动患者卒中危险因素分析

非瓣膜病心房颤动患者卒中危险因素分析

作者： paulin BILONDA kabeya（波林）大连医科大学

学位级别：硕士

背景:临床危险因素评估(CHA2DS2-VASC评分系统)是众所周知的预测心房颤动(简称房颤)的血栓栓塞风险(中风)的主要方法。而生物标志物,包括炎症因子和心脏标志物等作为额外因素也参与了危及生命的血栓事件,需要进一步研究他们之间的相关... 详细信息

背景:临床危险因素评估(CHA2DS2-VASC评分系统)是众所周知的预测心房颤动(简称房颤)的血栓栓塞风险(中风)的主要方法。而生物标志物,包括炎症因子和心脏标志物等作为额外因素也参与了危及生命的血栓事件,需要进一步研究他们之间的相关性。目的:分析房颤患者的卒中危险因素,探讨常规的CHA2DS2-VASC评分与生物标志物结合对卒中发生的预测价值。方法:回顾性研究(横截面设计)2015年01月至2017年12月期间**医科大学附属第二医院内科病房连续收治的非瓣膜病房颤患者。分为两组,第一组非卒中房颤患者,第二组首发卒中的房颤患者。我们用传统的人口学特点、CHA2-DS2-VASC模型和生活方式(吸烟、酒精摄入)等来描述临床危险因素;分别用化学发光免疫分析、定量免疫分析和胶乳增强IMM获得心脏生物标志物(高灵敏度肌钙蛋白、BNP、D-二聚体)结果,采用入院后第一次血液检查。应用卡方检或Kruskall-Wallis H检验,以及多变量(二元)Logistic回归分析(SPSS 23.0)评估临床危险因素和心脏生物标志物等和中风的关系,P0.05),这些因素与卒中不相关。进一步多因素回归分析显示年龄[OR=1.465,95%CI(1.168-1.900),p=0.006],吸烟[OR=3.200,95%CI(1.080-5.000),p=0.006];心力衰竭[OR=0.477,95%CI(0.371-0.673),p<0.000],冠心病[OR=0.394,95%CI(0.220-0.706),p<0.002],肌钙蛋白水平[OR=1.000,95%CI(0.999-1.001),p=0.010],BNP 水平[OR=0.999,95%CI(0.999-0.100),p=0.001],永久性房颤[OR=0.453,95%CI(0.192-1.073),p=0.042];warfarin 抗凝[OR=0.429,95%CI(0.238-0.773),p=0.005]与卒中的发生独立相关。而性别、高血压、糖尿病、肾脏疾病、酒精摄入、季节(春夏秋冬)、阿司匹林治疗、阵发性房颤和D-二聚体水平不是卒中发生的独立相关因素。ROC曲线分析表明高敏肌钙蛋白和BNP水平对卒中发生有良好的预测价值,曲线下面积分别为[(AUROC=(0568±0.029),p=0.010]和[(AUROC=(0.288±0.0.026),p=0.001]。ROC曲线分析还表明常规CHA2DS2-VASC评分系统,以及CHA2-DS2-VASc联合生物标志物评分系统(CHA2-DS2-VASc/BS)对卒中的预测均有价值,曲线下面积分别为[AUROC=(0.378±0.028),p=0.000]和[AUROC=(0.410±0.028),p=0.002]。CHA2DS0-VASc/BS评分系统对卒中的预测的敏感性和特异性分别是88.1%和94.2%,而常规CHA2DS2-VASC评分系统对卒中的预测的敏感性和特异性分别是74.1%和81.7%。结论1.非瓣膜病房颤患者中冠心病、心力衰竭、吸烟、房颤类型、华法林抗凝、BNP和高敏肌钙蛋白等因素与卒中的发生相关。2.多因素分析显示年龄、心力衰竭、冠心病、吸烟、永久性房颤、华法林抗凝、BNP和高敏肌钙蛋白水平是非瓣膜病房颤患者发生卒中的独立相关因素。3.常规CHA2DS2-VASC评分系统结合生物标志物(高敏肌钙蛋白和BNP)水平增高对卒中发生有很好的预测价值,比CHA2DS2-VASC评分系统的敏感性和特异性更高。

关键词：非瓣膜病心房颤动心脏生物标志物卒中危险因素

HIV阳性患者阴茎阴囊Fournier's坏疽29例报告

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中华男科学杂志 2013年第11期19卷 984-987页

作者：李益坚易露 kabeya Matumba 中南大学湘雅二医院泌尿外科湖南长沙410011 津巴布韦哈拉雷中心医院泌尿外科

目的：探讨HIV阳性Fournierg坏疽的临床特点并总结治疗体会。方法：回顾性分析了一组29例HIV阳性Foumierg坏疽患者特点和诊断治疗方法。结果：本组29例，均为HIV阳性男性患者，年龄21～81岁。CD4＋T淋巴细胞计数均〈320／mm^3，所有病... 详细信息

目的：探讨HIV阳性Fournierg坏疽的临床特点并总结治疗体会。方法：回顾性分析了一组29例HIV阳性Foumierg坏疽患者特点和诊断治疗方法。结果：本组29例，均为HIV阳性男性患者，年龄21～81岁。CD4＋T淋巴细胞计数均〈320／mm^3，所有病例均未接受抗逆转录病毒治疗（ART）。2例老年患者合并糖尿病。所有病例均以阴囊阴茎感染起病，进而发展为坏疽，并累及周围皮肤软组织。入院即行广泛清创，切开引流，并应用广谱抗生素治疗；4例需阴囊成形。26例痊愈，3例死亡（其中1例死于感染性休克，2例死于糖尿病并发肺部感染），死亡率10．3％。结论：早期广泛的外科清创引流和广谱抗生素应用仍然是处理HIV阳性Fournier＇s坏疽的关键；和之前的报道相比，未发现HIV阳性直接影响Foumier＇s坏疽的预后。

关键词： Fournier's坏疽 HIV阳性外科治疗

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单相单级式光伏并网逆变器设计

单相单级式光伏并网逆变器设计

作者： YASIN kabeya NKOMA（亚辛）东华大学

学位级别：硕士

随着全球能源资源的减少,新能源的开发成为全球共同的焦点。近几年,光伏发电的兴起给日益紧缺的能源带来了新的希望。光伏发电以其巨大的储存能量,适用范围广、绿色环保在所有新能源中占有重要的地位。因此,对光伏系统的研究,对未来能... 详细信息

随着全球能源资源的减少,新能源的开发成为全球共同的焦点。近几年,光伏发电的兴起给日益紧缺的能源带来了新的希望。光伏发电以其巨大的储存能量,适用范围广、绿色环保在所有新能源中占有重要的地位。因此,对光伏系统的研究,对未来能源问题的解决具有重要的意义和研究价值。本文主要研究光伏发电系统的可调度系统蓄电池充电系统和不可调度系统3KW单级式光伏并网逆变系统。主要研究两个系统MPPT算法的MATLAB仿真和实验实现及整个系统的软硬实现,系统的开发平台分别为PIC18F23K20,开发环境为MAPLAB和TMS320 C2812,其开发环境为CCStduio 3.3。首先,论文阐述了蓄电池充电系统的主电路DC/DC拓扑结构,分析基于Buck电路和Sepic电路的工作原理和基于半桥PWM的控制模式。设计主电路电感、储能电容参数,选择合理的功率开关管的设,通过实验对设计结果进行验证,在一定输入光伏电源下能完成对蓄电池的稳定充电。针对3KW单级式光伏并网逆变系统,分析主电路在双极性PWM控制下工作模式,设计输入平波电容参数,输出滤波电感参数,通过MATLAB仿真及实验验证,3KW逆变系统能在固定负载给定下稳定工作,且THD<5%。其次,本文主要完成光伏系统MPPT算法的研究。针对光伏蓄电池充电系统,根据对蓄电池充电特性的研究结合主电路工作特性,研究调节变器占空比的MPPT算法,在实现系统中得到验证其能源利用率可达90%以上。针对3KW单级式光伏并网逆变系统,研究光伏电池数学模型和工作暂态特性的基础上,研究分析传统MPPT算法的功率电压法和改进型功率电压法以及基于电荷流积的MPPT新型算法,通过MATLAB仿真和实验结果,其新型算法具有较好的实时性和稳定性,能源利用率可达95%以上。对光伏并网逆变系统进行孤岛效应研究。研究分析主动检测法和被动检测法,把输出电压过压、欠压被动检测发应用的实验系统中,系统能及时检测孤岛效应的产生,作出保护。最后,完成实验系统软硬件设计。本实验系统设计合理可靠,实验数据较为科学。光伏蓄电池充电系统能完成MPPT状态下稳定给蓄电池充电,充电效率达85%。单相3KW单级式光伏并网逆变系统成功并网,且并网电流THD<5%。

关键词：单级式光伏并网逆变系统 MPPT 孤岛检测并网逆变器公关控制器并网逆变器单级光伏逆变器最大功率跟踪孤岛检测电流波形

Prognostic Factors in Geriatric Patients with Metastatic Colon Cancer

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Journal of Cancer Therapy 2019年第10期10卷 779-788页

作者： Kenji Ina Megumi kabeya Shu Yuasa Yuko Kato Satoshi Kayukawa Takae Kataoka Ryuichi Furuta Department of Medical Oncology Nagoya Memorial Hospital Nagoya Japan Department of Phamacy Nagoya Memorial Hospital Nagoya Japan Medical Social Work Consultation Room Nagoya Memorial Hospital Nagoya Japan Department of Clinical Oncology Nagoya Memorial Hospital Nagoya Japan.

Backgrounds: Colorectal cancer is an important contributor to cancer morbidity and mortality. Given that many older adult patients often have concomitant diseases and impairments in organ function, they are at increased risk for chemotherapy toxicity. Therefore, it is important to identify prognostic factors in older patients undergoing chemotherapy. Methods: We performed a retrospective chart review of colorectal cancer patients treated at Nagoya Memorial Hospital between 2012 and 2017 and selected those who received chemotherapy for metastatic colon cancer. Overall survival was calculated from the beginning of chemotherapy until death or the most recent follow-up date. We used the Kaplan-Meier method to plot survival curves and performed a statistical comparison using a log-rank test. In addition, multivariate analysis was performed using stepwise Cox proportional hazards models. Finally, a comprehensive geriatric assessment was conducted for older patients. The chart review was approved by the ethics committee of Nagoya Memorial Hospital. Results: The overall survival of metastatic colon cancer patients was not markedly different between patients aged ≥ 65 years of age (N = 37). Neither lesion site nor the RAS status affected survival, whereas the usage of three kinds of cytotoxic agents prolonged longevity. In a multivariate analysis of patients ≥ 65 years of age, the only independent prognostic factor for survival was the functional capacity, as measured by the Tokyo Metropolitan Institute of Gerontology (TMIG) index of competence. Conclusions: A combination of the comprehensive geriatric assessment and TMIG index was useful for predicting the longevity in patients with metastatic colon cancer ≥ 65 years of age.

关键词： Metastatic Colon Cancer Chemotherapy Comprehensive Geriatric Assessment TMIG Index of Competence

Calculation of Forest Potential Evapotranspiration of Okinawa in Japan Using the Penman Equation

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Journal of Water Resource and Protection 2014年第9期6卷 813-820页

作者： Takuya Arakaki Akira Shimizu Naoki kabeya Hitoshi Ikuzawa Takanori Shimizu Shin’ichi Iida Hiroshi Furugen Forestry and Forest Products Research Institute Tsukuba Japan Incorporated Okinawa Prefecture Environment Science Centre Urazoe Japan Kyushu Research Centre Forestry and Forest Products Research Institute Kurokami Japan Okinawa Prefecture Forest Resource Research Centre Nago Japan

The northern area of Okinawa Island is a unique forest area in Japan, with a distinctive ecosystem and subtropical climate. The area is a central region of forestry in Okinawa Prefecture. However, quantitative evaluation of the effects of the forest environment is inadequate. The authors began meteorological observation of this forested area to address this situation by setting up a weather station in 2009. In this study, we performed research on one of the major factors of the water cycle in forest ecosystems, evapotranspiration. We calculate seasonal changes in potential evapotranspiration through analysis of data from our weather station in 2013, because all measurement elements were assembled. To calculate potential evapotranspiration, we used the Penman equation. We found that the potential evapotranspiration in this forest area was 1170.5 mm in 2013. The mean temperature in 2013 was 20.7°C, yearly average relative humidity was 84.7%, and average wind speed was 1.40 m/s. Regarding the amount of evapotranspiration in the forests of northern Okinawa Island, which has not been previously obtained, it has become possible to calculate the amount of potential evapotranspiration using the Penman equation.

关键词： Potential Evapotranspiration Penman Equation Weather Station Subtropical Region Evergreen Forest

Dynamics of non-structural carbohydrates following a full masting event reveal a role for stored starch in relation to reproduction in Fagus crenata

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Forestry Research 2021年第1期1卷 163-172页

作者： Daisuke kabeya Atsuhiro Iio Yoshitaka Kakubari Qingmin Han Department of Plant Ecology Forestry and Forest Products Research Institute(FFPRI)1 MatsunosatoTsukubaIbaraki 305-8687Japan Faculty of Agriculture University of ShizuokaOhya 836Shizuoka 422-8529Japan University of Shizuoka

Although mature trees have substantial non-structural carbohydrate(NSC)storage that is well documented with respect to its capacity to buffer the asynchrony of supply and demand at the whole-plant level,its role in reproduction remains poorly understood,especially in mast seeding *** order to elucidate whether masting depletes the whole-tree NSC storage pool,seasonal and inter-annual variations in starch and soluble sugar(SS)concentrations in branchlets,stems and coarse roots of Fagus crenata were measured in two stands over 5 years after a full masting *** masting reduced individual storage pools to 72% and 49% of the maxima in the two stands;this was observed 2-3 years after full *** addition,temporary reduction in starch concentration in summer due to moderate fruiting was found in roots and deep sapwood cores of stems,representing tree rings formed 20 years ago,but not in *** with a higher starch storage pool in roots than in branchlets,these results indicate that starch stored in roots and stems is available and supports life-history traits,such as masting events,that occur ***,limited rainfall in the late growing season caused a reduction in both organ NSC concentration and individual storage irrespective of masting,which further complicated the masting-NSC *** findings have important implications for interpreting the role of carbon resources in masting events.

关键词： roots starch structural

Rainfall and Runoff Observations in the Subtropical Forest of Okinawa Island, Japan

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Journal of Water Resource and Protection 2014年第6期6卷 625-634页

作者： Naoki kabeya Akira Shimizu Takanori Shimizu Hitoshi Ikuzawa Takuya Arakaki Hiroshi Furugen Yashuhiro Ohnuki Shiho Asano Forestry and Forest Products Research Institute Tsukuba Japan Incorporated Okinawa Prefecture Environment Science Centre Urazoe Japan Kyushu Research Centre Forestry and Forest Products Research Institute Kumamoto Japan Okinawa Prefecture Forest Resource Research Centre Nago Japan

We set up two experimental catchments to provide an improved understanding of hydrological processes in a subtropical forested area in the northern part of Okinawa Island, Japan. We calculated runoff using water level data (recorded by a pressure-type water level gauge installed in a box culvert) and a discharge rating curve (derived from in situ observations). Water balance calculations for 2010 showed that the rainfall, runoff and evapotranspiration losses (= rainfall – runoff) were 3403.6 mm, 2285.7 mm and 1117.4 mm, respectively. This result was in agreement with previous results from other forested experimental catchments in this region. Direct runoff, as a proportion of event total rainfall, can be expressed by the empirical equation (Qdirect = 0.0048, Pevent 1.7971, R2 = 0.9599). When Pevent was 100 mm or less, the ratios of Qdirect to Pevent were less than 15% in general. When Pevent exceeded 100 mm, the ratios were 20% - 30%.

关键词： Direct Runoff Forested Watershed Okinawa Island Rainfall-Runoff Observation Sub-Tropical Forest Water Balance