The effects of electron-phonon interaction on energy levels of a polaron in a wurtzite nitride finite parabolic quantum well （PQW） are studied by using a modified Lee-Low-Pines variational method. The ground state, ...The effects of electron-phonon interaction on energy levels of a polaron in a wurtzite nitride finite parabolic quantum well （PQW） are studied by using a modified Lee-Low-Pines variational method. The ground state, first excited state, and transition energy of the polaron in the GaN/Al0.3Ga0.7N wurtzite PQW are calculated by taking account of the influence of confined LO（TO）-like phonon modes and the half-spaee LO（TO）-like phonon modes and considering the anisotropy of all kinds of phonon modes. The numerical results are given and discussed. The results show that the electron-phonon interaction strongly affects the energy levels of the polaron, and the contributions from phonons to the energy of a polaron in a wurtzite nitride PQW are greater than that in an A1GaAs PQW. This indicates that ehe electron-phonon interaction in a wurtzite nitride PQW is not negligible.展开更多
The present work proposed a method for match SAR and AIS data to detect vessels carrying out suspicious activity in the Ivorian EEZ. Two superposition methods, detected AIS and SAR data, based on point-to-point associ...The present work proposed a method for match SAR and AIS data to detect vessels carrying out suspicious activity in the Ivorian EEZ. Two superposition methods, detected AIS and SAR data, based on point-to-point association on the one hand and point-to-line on the other hand, were used to detect suspicious vessels in Ivorian marine waters. The results showed that most vessels detected in the Ivorian EEZ do not declare their positions to avoid being spotted. These funds are likely to practice illegal, undeclared and unregulated fishing (INN fishing). This clandestine activity is very recurrent in Ivorian waters. This is illustrated by the number of suspicious vessels detected by SAR radar imagery which is greater compared to declared or authorized vessels.展开更多
生物药(bio-therapeutics)是指采用生物技术制备的、临床上用于疾病治疗的大分子生物制品,具有结构复杂、异质性高等特点,科学严谨的生物药通用名命名,是区分生物药物质基础的主要依据,也是药品生命周期管理的重要基础。世界卫生组织(Wo...生物药(bio-therapeutics)是指采用生物技术制备的、临床上用于疾病治疗的大分子生物制品,具有结构复杂、异质性高等特点,科学严谨的生物药通用名命名,是区分生物药物质基础的主要依据,也是药品生命周期管理的重要基础。世界卫生组织(World Health Organization,WHO)协调建立的国际非专利名称(International Nonproprietary Names,INN)是全球药物命名的标准化体系。从INN的起源,以及生物药INN的类别、发生与发展为主线,以较为详实的数据统计和分析,呈现了全球生物药的衍化进程,从不同的角度纵览生物药技术发展历程,对生物药的研发设计、技术标准及监管策略的考量均具有一定的参考意义。展开更多
InN film was grown on 4H-SiC （0001） substrate by RF plasma-assisted molecular beam epitaxy （RF- MBE）. Prior to the growth of InN film, an InN buffer layer with a thickness of ～5.5 nm was grown on the substrate. S...InN film was grown on 4H-SiC （0001） substrate by RF plasma-assisted molecular beam epitaxy （RF- MBE）. Prior to the growth of InN film, an InN buffer layer with a thickness of ～5.5 nm was grown on the substrate. Surface morphology, microstructure and structural quality of InN film were investigated. Micro-structural defects, such as stacking faults and anti-phase domain in InN film were carefully investigated using transmission electron microscopy （TEM）. The results show that a high density of line contrasts, parallel to the growth direction （c-axis）, was clearly observed in the grown InN film. Dark field TEM images recorded with diffraction vectors g = 1120 and g = 0002 revealed that such line contrasts evolved from a coalescence of the adjacent rnisoriented islands during the initial stage of the InN nucleation on the substrate surface. This InN nucleation also led to a generation of anti-phase domains.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 10364003.
文摘The effects of electron-phonon interaction on energy levels of a polaron in a wurtzite nitride finite parabolic quantum well （PQW） are studied by using a modified Lee-Low-Pines variational method. The ground state, first excited state, and transition energy of the polaron in the GaN/Al0.3Ga0.7N wurtzite PQW are calculated by taking account of the influence of confined LO（TO）-like phonon modes and the half-spaee LO（TO）-like phonon modes and considering the anisotropy of all kinds of phonon modes. The numerical results are given and discussed. The results show that the electron-phonon interaction strongly affects the energy levels of the polaron, and the contributions from phonons to the energy of a polaron in a wurtzite nitride PQW are greater than that in an A1GaAs PQW. This indicates that ehe electron-phonon interaction in a wurtzite nitride PQW is not negligible.
文摘The present work proposed a method for match SAR and AIS data to detect vessels carrying out suspicious activity in the Ivorian EEZ. Two superposition methods, detected AIS and SAR data, based on point-to-point association on the one hand and point-to-line on the other hand, were used to detect suspicious vessels in Ivorian marine waters. The results showed that most vessels detected in the Ivorian EEZ do not declare their positions to avoid being spotted. These funds are likely to practice illegal, undeclared and unregulated fishing (INN fishing). This clandestine activity is very recurrent in Ivorian waters. This is illustrated by the number of suspicious vessels detected by SAR radar imagery which is greater compared to declared or authorized vessels.
文摘生物药(bio-therapeutics)是指采用生物技术制备的、临床上用于疾病治疗的大分子生物制品,具有结构复杂、异质性高等特点,科学严谨的生物药通用名命名,是区分生物药物质基础的主要依据,也是药品生命周期管理的重要基础。世界卫生组织(World Health Organization,WHO)协调建立的国际非专利名称(International Nonproprietary Names,INN)是全球药物命名的标准化体系。从INN的起源,以及生物药INN的类别、发生与发展为主线,以较为详实的数据统计和分析,呈现了全球生物药的衍化进程,从不同的角度纵览生物药技术发展历程,对生物药的研发设计、技术标准及监管策略的考量均具有一定的参考意义。
基金黑龙江省自然基金(F201202)黑龙江省教育厅骨干教师项目(125G031)+1 种基金黑龙江省研究生创新科研资金项目(No.YJSCX2011-414HLJ)The Natural Science Foundation of Heilongjiang Province under Grant(A201304)
文摘以金属铟为靶材,蓝宝石为衬底,氩和氮的混合气体为溅射气体,衬底温度为100℃,溅射功率为100 W,采用射频磁控溅射技术分别制备了溅射压强为0.8、1.0、1.4 Pa的In N薄膜.利用XRD、SEM分析薄膜样品呈六方纤锌矿结构.使用双光束紫外/可见分光光度计测量薄膜的吸收谱,计算得到在溅射压强为0.8、1.0、1.4 Pa下制得的薄膜样品带隙分别为1.825、1.74、1.82 e V.结果表明溅射压强为1.0 Pa时,带隙值最小,结晶质量最好.
基金supported by the Thailand Center of Excellence in Physics(Th EP)the King Mongkut’s University of Technology Thonburi under The National Research University Project+2 种基金supported by the National Research Council of Thailand(NRCT)the Thai Government Stimulus Package 2(TKK2555)the Project for Establishment of Comprehensive Center for Innovative Food,Health Products and Agriculture
文摘InN film was grown on 4H-SiC （0001） substrate by RF plasma-assisted molecular beam epitaxy （RF- MBE）. Prior to the growth of InN film, an InN buffer layer with a thickness of ～5.5 nm was grown on the substrate. Surface morphology, microstructure and structural quality of InN film were investigated. Micro-structural defects, such as stacking faults and anti-phase domain in InN film were carefully investigated using transmission electron microscopy （TEM）. The results show that a high density of line contrasts, parallel to the growth direction （c-axis）, was clearly observed in the grown InN film. Dark field TEM images recorded with diffraction vectors g = 1120 and g = 0002 revealed that such line contrasts evolved from a coalescence of the adjacent rnisoriented islands during the initial stage of the InN nucleation on the substrate surface. This InN nucleation also led to a generation of anti-phase domains.
