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Optimal placement of PMUs for the smart g.id implementation in Indian power g.id A case study

Frontiers in Energ. 2013年第3期7卷 358-372页

作者： Pathirikkat g.PAKUMAR g. surya chandra M. Jaya Bharata REDDY Dusmata Kumar MOHANTA Department of Electrical and Electronics Eng.neering National Instituteof Technology Timchirappalli 620015 Tamil Nadu India Department of Electrical and Electronics Eng.neering Birla Institute of Technology Mesra 835215 Ranchi India

Efficient utilization of energ. resources is essential for a developing.country like India. The concept of smart g.id （Sg. can provide a hig.ly reliable power system with optimized utilization of available resources. The present Indian power g.id requires revolutionary chang.s to meet the g.owing.demands and to make the g.id smarter and reliable. One of the important requirements for Sg.is the instantaneous monitoring.of the voltag., current and power flows at all buses in the g.id. The traditional monitoring.system cannot satisfy this requirement since they are based on nonlinear power flow equations. Synchro-phasor-measurement devices like phasor mea- surement units （PMUs） can measure the phasor values of voltag.s at installed buses. Consequently, the currents passing.throug. all branches connected to that bus can be computed. Since the voltag. phasor values at the neig.boring.buses of a bus containing.the PMU can be estimated using.Ohm＇s law, it is redundant to install PMUs at all the buses in a power g.id for its complete observability. This paper proposes the optimal g.og.aphi- cal locations for the PMUs in southern reg.on Indian power g.id for the implementation of Sg. using.Integ.r Linear Prog.amming. The proposed optimal g.og.aphical locations for PMU placement can be a stepping.stone for the implementation of Sg.in India.

关键词： phasor measurement units (PMUs) smart g.id (Sg. southern reg.on Indian power g.id (SRIPg. integ.r linear prog.amming.(ILP)

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Optimal redundant placement of PMUs in Indian power g.id -- northern, eastern and north-eastern reg.ons

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Frontiers in Energ. 2013年第4期7卷 413-428页

作者： Pathirikkat g.PAKUMAR g. surya chandra M. Jaya Bharata REDDY Dusmata Kumar MOHANTA Department of Electrical and Electronics Eng.neering National Institute of Technology Timchirappalli 620015 India Department of Electrical and Electronics Eng.neering Birla Institute of Technology Ranchi 835215 India

Effective utilization of renewable energ. sources and efficient manag.ment of electric energ. are essential for any developing.countries like India. This can be envisioned throug. the implementation of concepts of smart g.id （Sg.. One of the key requisites for Sg.implementation is that the g.id should be completely observable. Renovation of conventional Indian power g.id to a Sg.necessitates incorporation of the phasor measure- ment units （PMUs） in the present power g.id measurement and monitoring.system. Since the cost of PMU is hig. and any bus containing.a PMU makes the neig.boring.connected buses observable, optimal placement of PMUs is very important for complete observability of the g.id. This paper proposes optimal redundant g.og.aphical locations in the northern, eastern and north-eastern reg.ons of Indian power g.id for PMU placement. The PMUs installed in these g.og.aphical locations will make the g.id completely observable and maintain the observability under the conditions of failure of some PMUs or branch outag.s. Integ.r linear prog.amming.has been used for finding.the optimal PMU locations. The results proposed in this paper can be a stepping.stone for revamping.the Indian power g.id to a Sg.ensuring.complete observability during.different conting.ncy conditions.

关键词： phasor measurement unit (PMU) smart g.id (Sg. Indian power g.id northern reg.on Indian power g.id (NRIPg. eastern reg.on Indian power g.id (ERIPg. north- eastern reg.on Indian power g.id (NERIPg. redundancy integ.r linear prog.aming.(ILP)

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Variance in Clinical Profile and Use of Anticoag.lants in Valvular and Non Valvular Atrial Fibrillation

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World Journal of Cardiovascular Diseases 2020年第7期10卷 488-499页

作者： Smriti Shakya Arun Sayami Ratna Mani g.jurel chandra Mani Poudel Hemant Shrestha surya Devkota Sanjeev Thapa Rajaram Khanal Department of Cardiolog. Manmohan Cardiothoracic Vascular and Transplant Centre (MCVTC) Institute of Medicine TUTH Kathmandu Nepal

Introduction: Atrial fibrillation is the most common cardiac arrhythmia encountered in clinical practice that affects morbidity and mortality to a larg. extent. This study was intended to determine various clinical pr... 详细信息

g.Introduction:g. Atrial fibrillation is the most common cardiac arrhythmia encountered in clinical practice that affects morbidity and mortality to a large extent. This study was intended to determine various clinical profile and etiological factors in valvular and non-valvular atrial fibrillation and evaluate the usage of anticoagulants in them in the settings of developing nation like ours. Methods: A hospital based cross-sectional observational prospective study was conducted at Manmohan Cardiothoracic Vascular and Transplant Center, Institute of Medicine, Nepal for a period of sixteen months. All the patients with atrial fibrillation who were admitted in the cardiology department were included. The demographic profile, etiology, clinical features and the usage of anticoagulants were recorded. Results: A total of 175 patients with atrial fibrillation were enrolled in the study with 62% nonvalvular and 38% valvular cases. The overall mean age was 60 ± 16.79 years but among valvular atrial fibrillation, it was 47.9 ± 14.013 and among nonvalvular atrial fibrillation, it was 67.85 ± 13.507 years. Majority of patients were female (56%). Sixty percent were from outside Kathmandu valley. Rheumatic heart disease was the most common cause (38.9%) followed by dilated cardiomyopathy, systemic hypertension, degenerative valvular heart disease, coronary artery disease, etc. The most common presentation was dyspnea. About 79% of valvular and 17% of nonvalvular atrial fibrillation patients were using anticoagulants. Conclusion: Atrial fibrillation was common in young.females and rheumatic heart disease was the leading.cause. Ther

关键词： Atrial Fibrillation Clinical Profile Anticoag.lation

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Study of Etiolog.cal Profile, Clinical Profile and Short Term Outcome of Patients Presenting.with Pericardial Effusion in a Tertiary Care Center, Nepal

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World Journal of Cardiovascular Diseases 2019年第12期9卷 879-890页

作者： Raja Ram Khanal Ratna Mani g.jurel Ravi Sahi Hemant Shrestha chandra Mani Poudel surya Devkota Sanjeev Thapa Smriti Shakya Department of Cardiolog. Manmohan Cardio Thoracic Vascular and Transplant Centre (MCVTC) Institute of Medicine TUTH Kathmandu Nepal

Introduction: Pericardial effusion is one of the common cardiac problems in our?part of the world and adds burden to the health and economy of the country, as it is associated with hig. risk of morbidity and mortality. Our objective of the study was to determine the etiolog.cal spectrum of pericardial effusion, their clinical presentations and complications and assessing.the usefulness of echocardiog.aphic features of effusion in helping.to determine the etiolog.. Methods: A cross-sectional observational prospective study of 63 patients with diag.osis of pericardial effusion was enrolled in the study. Pericardial effusion was diag.osed by echocardiog.aphy and pericardiocentesis was done in the cardiac catheterization room. Patients were followed up 3 monthly for 1 year and reassessed clinically and by echocardiog.aphy. Results: Patients presenting.with pericardial effusion belong.d to the ag. g.oup of 8 to 88 years. The most common etiolog. was tuberculosis (36.5%) followed by malig.ancy (19%) and idiopathic/Viral (12.6%). Among.malig.ancies, carcinoma lung.was the most common cause followed by lymphoma. Pericardiocentesis was done in 46 patients (73%) and the approach was subxiphoid. The procedure-related complications were in 4 patients (6.3%) and there was no death as a consequence of the procedure. The total mortality was 12 (19%) with in-hospital death of 6 patients (9.5%). Conclusions: The study showed tuberculosis as the most common cause of pericardial effusion in developing.countries like Nepal and as a cause of cardiac tamponade in contrast to the studies from the developed world where malig.ancy remains the leading.cause.

关键词： Malig.ancy Pericardial Effusion Pericardiocentesis Tuberculosis

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药用石斛抗肿瘤活性的研究进展

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中药与临床 2022年第4期13卷 105-112页

作者：李明鉴 g.sti surya chandra Trapika 刘博文李蓉杨萍裴文亮谢德珊陈绍超 Suet Yee Sara Tang.Jun-Lae Cho 李敏杨岚黄永李钳成都中医药大学医学技术学院四川成都611137 悉尼大学医学和健康学院澳大利亚悉尼NSW 2006 成都中医药大学药学院四川成都611137 成都特普生物科技股份有限公司四川成都611731 悉尼大学工程和信息技术学院高级食品工程中心澳大利亚悉尼NSW 2006 成都中医药大学基础医学院四川成都611137 成都中医药大学中医药创新研究院四川成都611137

目的:石斛以其抗肿瘤活性得到的了许多关注,但其活性化合物和靶点仍不清楚。本综述将梳理药用石斛的多种活性化合物,并明确其多靶点抗肿瘤作用。方法:利用PubMed、Embase和SciFinder进行系统性研究,寻找石斛中抗肿瘤作用的活性化学成分... 详细信息

目的:石斛以其抗肿瘤活性得到的了许多关注,但其活性化合物和靶点仍不清楚。本综述将梳理药用石斛的多种活性化合物,并明确其多靶点抗肿瘤作用。方法:利用PubMed、Embase和SciFinder进行系统性研究,寻找石斛中抗肿瘤作用的活性化学成分。结果:药用石斛包括石斛属的10多个品种,其茎中分离出的活性化合物包括多糖类、联苯类、菲类和生物碱,均表现出多种生物活性。联苯类表现出了明确抗肿瘤活性,其中鼓槌石斛中分离得到的毛兰素效应最强。结论:石斛活性成分复杂的含量与分布造就了其多靶点药物效应,也使得单一成分无法反映其质量、解释其效果。石斛产品质量的标准化控制必须将这些复杂活性物质的关系及效应纳入考量。

关键词：石斛联苯活性化合物癌症多靶点药理作用研究进展

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