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Exciton-polaritons in a 2D hybrid organic-inorganic perovskite microcavity with the presence of optical Stark effect

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Chinese Physics B 2024年第3期33卷 551-555页

作者： kennet. coker 郑楚媛 Joseph Roger Arhin Kwame Opuni-Boachie Obour Agyekum 张伟利 School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Department of Electrical and Electronic Engineering Ho Technical UniversityHo 00233Ghana Telecommunication Engineering Department Kwame Nkrumah University of Science and TechnologyKumasi 00233Ghana

This study investigates the properties of exciton-polaritons in a two-dimensional(2D)hybrid organic-inorganic perovskite microcavity in the presence of optical Stark *** both steady and dynamic state analyses,strong coupling between excitons of perovskite and cavity photons is revealed,indicating the formation of polaritons in the perovskite ***,it is found that an external optical Stark pulse can induce energy shifts of excitons proportional to the pulse intensity,which modifies the dispersion characteristics of the polaritons.

关键词： exciton-polaritons perovskite microcavity optical Stark effect

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塞拉利昂近海沙丁鱼种群动态和管理策略

塞拉利昂近海沙丁鱼种群动态和管理策略

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作者：库克（Ivorymae coker）大连海洋大学

学位级别：硕士

2015年9月联合国大会第70/1号决议通过2030年可持续发展议程。议程宣布了 17项全球可持续发展目标(SDGs),旨在通过综合解决当前社会、经济和环境层面的发展问题,促进全球可持续发展。可持续发展目标1(消除贫困)、2(零饥饿)和14(水下生命... 详细信息

2015年9月联合国大会第70/1号决议通过2030年可持续发展议程。议程宣布了 17项全球可持续发展目标(SDGs),旨在通过综合解决当前社会、经济和环境层面的发展问题,促进全球可持续发展。可持续发展目标1(消除贫困)、2(零饥饿)和14(水下生命)与渔业密切相关。渔业资源的可持续发展和管理是渔业高质量发展的基础。马德拉沙丁鱼(Sardinella maderensis)是塞拉利昂近海重要经济鱼种。进入21世纪以来,马德拉沙丁鱼的渔业资源明显减少,体型小型化日益明显。因此,了解马德拉沙丁鱼的生物学和种群特征,科学制定开捕规格、最大持续产量和禁渔期等管理策略至关重要。利用2017年现场调查数据,从体长-体重关系、个体生长方程等方面分析了沙丁鱼的生长特征;从瞬时死亡率、开发率、单位补充量渔获量等方面分析了渔业资源的动态变化;在分析鱼类繁殖习性和繁殖力的基础上,模拟了禁捕策略。结果如下:(1)生长特征:塞拉利昂近海马德拉沙丁鱼的体长-体重关系为W=6×10-5L2.6157,Von Bertalanffy 生长方程为 Lt=396[1-e-0.29(t+0.47)];Wt=374.1[1-e-0.29(t+0.47)]2.6157。体重生长的拐点年龄为2.84龄,拐点体长为244.4mm,拐点体重为218.2g。(2)种群特征:塞拉利昂近海马德拉沙丁鱼群体的瞬时总死亡率(Z)、瞬时自然死亡率(M)、瞬时捕捞死亡率(F)和开发率分别为2.97 a-1、0.7096 a-1、2.258 a-1和0.761。群体的临界年龄为2.29龄,临界体长为218.2mm,临界体重为78.7g。资源生物量为128,277.79 t。在当前资源利用状态下(即Lc=135 mm时),获得最适产量、最大持续产量和最大产量对应的开发率分别为E0.1=0.507,E0.5=0.316 and Emax=0.602均小于当前开发率(E=0.7609),渔业资源处于过度利用状态;(3)休渔期:运用ERR和SBR模型模拟了四种管理策略对EPR和SBR值的影响,结果表明:采用策略1时(休渔期为4-5月,当前休渔策略),EPR值占理论未开发时的18.2%,SBR值占理论未开发时的18.1%;采用策略2时(休渔期为2-4月),EPR值占理论未开发时的59.8%;SBR值占理论未开发时的27.4%;采用策略3时(休渔期为8-10月),EPR值占理论未开发时的40.4%;SBR值占理论未开发时的21.4%;采用策略4时(休渔期为4月和10月),EPR值占理论未开发时的30.8%;SBR值占理论未开发时的16.9%。综合考虑后建议塞拉利昂海域马德拉沙丁鱼的休渔期为2月至4月。

关键词：马德拉沙丁鱼塞拉利昂近海资源现状管理策略

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Progress in surgical and nonsurgical approaches for hepatocellular carcinoma treatment

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Hepatobiliary & Pancreatic Diseases International 2016年第3期15卷 234-256页

作者： Ender Gunes Yegin Erkan Oymac1 Emrah Karatay Ahmet coker Department of Gastroenterology Bozyaka Trainingand Research HospitalIzmir Depatment of Gastroenterology Surgery Bozyaka Trainingand Research HospitalIzmir Department of Radiology Bulanlk State HospitalMus Department of General Surgery Ege University Faculty of MedicineIzmiTurk

BACKGROUND： Hepatocellular carcinoma （HCC） is a com- plex and heterogeneous malignancy, frequently occurs in the setting of a chronically diseased organ, with multiple con- founding factors making its management challenging. HCC represents one of the leading causes of cancer-related mortal- ity globally with a rising trend of incidence in some of the de- veloped countries, which indicates the need for better surgical and nonsurgical management strategies.

关键词： hepatocellular carcinoma surgical liver resection liver transplantation locoregional therapies molecular targeted systemic therapies immunotherapy gene therapy

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Mass-transfer studies of solid-base catalyst-aided CO_(2) absorption and solid-acid catalyst-aided CO_(2) desorption for CO_(2) capture in a pilot plant using aqueous solutions of MEA and blends of MEA-MDEA and BEA-AMP

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Clean Energy 2019年第4期3卷 263-277页

作者： James coker Daniel Boafo Afari Jessica Narku-Tetteh Raphael Idem Clean Energy Technologies Research Institute(CETRI) University of Regina3737 Wascana ParkwayReginaSK S4S 0A2Canada

Mass-transfer studies of catalyst-aided CO_(2) absorption and desorption were performed in a full-cycle,bench-scale pilot plant to improve CO_(2) absorption using 5M MEA,5M MEA-2M MDEA and 2M BEA-2M AMP.A solid-base catalyst,K/MgO,and an acid catalyst,HZSM-5,were used to facilitate absorption and desorption,*** and desorption mass-transfer performance was presented in terms of the overall mass-transfer coefficient of the gas side(KGav)and liquid side(K_(L)a_(v)),*** non-catalytic runs,the highest K_(G)a_(V) and K_(L)a_(V) were 0.086 Kmol m^(3).*** and 0.7851 hr for 2M BEA-2M AMP *** results showed 38.7% KGav and 23.6% K_(L)a_(v) increase for 2M BEA-2M AMP with only HZSM-5 catalyst in desorber and a 95% K_(G)a_(V) and 45% K_(L)a_(V) increase for both K/MgO catalyst and HZSM-5 *** was attributed to the role of K/MgO in bonding loosely with CO_(2) and making it available for the amine reaction.

关键词： HZSM-5 K/MgO catalyst CO_(2)removal efficiency CO_(2)capture mass-transfer coefficients of absorber(KGaV)and desorber(K_(L)a_(V))

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Xanthogranulomatous pancreatitis treated by duodenum-preserving pancreatic head resection

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Hepatobiliary & Pancreatic Diseases International 2010年第2期9卷 216-218页

作者： Alper Uguz Sava■ Yakan Baris Gurcu Funda Yilmaz Tankut Ilter Ahmet coker Department of Surgery Hepatopancreatobiliary DivisionEge University Faculty of Medicine Department of Pathology Ege University Faculty of Medicine Department of Gastroenterology Ege University Faculty of Medicine

BACKGROUND:Xanthogranulomatosis is an idiopathic,rare process in which lipid-laden histiocytes are deposited at various locations in the *** present two cases who were treated by duodenum-preserving pancreatic head resection and eventually diagnosed as having xanthogranulomatous pancreatitis. METHODS:A 30-year-old caucasian man was admitted to our clinic for vague abdominal pain and epigastric dullness. Magnetic resonance cholangiopancreatography and endoscopic retrograde pancreatography suggested the existence of chronic *** 34-year-old caucasian woman was admitted to our clinic because of right upper quadrant pain. Magnetic resonance cholangiopancreatography demonstrated a dilatation and stone of the main pancreatic *** on a diagnosis of chronic pancreatitis,pancreatic head resection was planned and a laparotomy was performed in both of cases. RESULTS:In both cases,duodenum-preserving pancreatic head resection was *** and microscopic findings revealed xanthogranulomatous inflammation,which led to a diagnosis of xanthogranulomatous pancreatitis. CONCLUSION:Although this type of pancreatitis is extremely rare,it is important to keep it in mind for a differential diagnosis because it may simulate chronic pancreatitis or a malignant tumor on imaging.

关键词： xanthogranulomatous pancreatitis pancreatic head resection

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