检索结果-南通市图书馆

Photonics Research 2020年第3期8卷 375-380页

作者： yeyu ZHU SIWEI ZENG LIN ZHU Department of Electrical and Computer Engineering Center for Optical Materials Science and Engineering TechnologiesClemson UniversityClemsonSouth Carolina 29634USA

Chip-scale,tunable narrow-linewidth hybrid integrated diode lasers based on quantum-dot RSOAs at 1.3μm are demonstrated through butt-coupling to a silicon nitride photonic integrated *** hybrid laser linewidth is around 85 k Hz,and the tuning range is around 47 ***,a fully integrated beam steerer is demonstrated by combining the tunable diode laser with a waveguide surface *** system can provide beam steering of 4.1°in one direction by tuning the wavelength of the hybrid ***,a wavelength-tunable triple-band hybrid laser system working at^1,~1.3,and^1.55μm bands is demonstrated for wide-angle beam steering in a single chip.

关键词： tunable tuning waveguide

Dealloyed TiCuMn efficiently catalyze the NO reduction and Zn-NO batteries

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2024年第9期18卷 51-59页

作者： Lang Zhang Tong Hou Weijia Liu yeyu Wu Tianran Wei Junyang Ding Qian Liu Jun Luo Xijun Liu State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures MOE Key Laboratory of New Processing Technology for Nonferrous Metals and MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China Education Department of Guangxi Zhuang Autonomous Region Key Laboratory of Applied Analytical ChemistryGuangxi Collaborative Innovation Center for Chemistry and Engineering of Forest ProductsGuangxi Key Laboratory of Chemistry and Engineering of Forest ProductsKey Laboratory of Chemistry and Engineering of Forest ProductsState Ethnic Affairs CommissionSchool of Chemistry and Chemical EngineeringGuangxi Minzu UniversityNanning 530006China Institute for New Energy Materials&Low-Carbon Technologies School of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China Institute for Advanced Study Chengdu UniversityChengdu 610106China ShenSi Lab Shenzhen Institute for Advanced StudyUniversity of Electronic Science and Technology of ChinaShenzhen 518110China

Electrocatalytic NO reduction reaction offers a sustainable route to achieving environmental protection and NH3 production targets as *** this work,a class of dealloyed Ti_(60)Cu_(33)Mn_(7)ribbons with enough nanoparticles for the high-efficient NO reduction reaction to NH_(3)is fabricated,reaching an excellent Faradaic efficiency of 93.2%at–0.5 V vs reversible hydrogen electrode and a high NH_(3) synthesis rate of 717.4μmol·h^(-1)·mg_(cat).^(-1) at–0.6 V vs reversible hydrogen *** formed nanoparticles on the surface of the catalyst could facilitate the exposure of active sites and the transportation of various reactive ions and ***,the Mn content in the TiCuMn ribbons modulates the chemical and physical properties of its surface,such as modifying the electronic structure of the Cu species,optimizing the adsorption energy of N^(*)atoms,decreasing the strength of the NO adsorption,and eliminating the thermodynamic energy barrier,thus improving the NO reduction reaction catalytic ***,a Zn-NO battery was fabricated using the catalyst and Zn plates,generating an NH_(3) yield of 129.1µmol·h^(-1)·cm^(-2)while offering a peak power density of 1.45 mW·cm^(-2).

关键词： nitric oxide reduction NH_(3)electrosynthesis TiCuMn alloy Mn modulation Zn-NO battery

Integrated coherent combining of angled-grating broad-area lasers

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Optoelectronics 2016年第2期9卷 290-300页

作者： Yunsong ZHAO yeyu ZHU Lin ZHU Electrical and Computer Engineering Department Clemson University Clemson SC 29634 USA Center for Optical Material Science and Engineering Technologies Clemson University Clemson SC 29634 USA

In this paper, we investigated coherent beam combining of angled-grating broad-area lasers in a completely integrated approach. We obtained the simultaneous coherent beam combining and single transverse mode operation on a single chip through the integrated coupling regions and the transverse Bragg resonance （TBR） gratings, respectively. The proposed combining method can be easily extended to a zigzag-like laser array. We analyzed the scalability of the zigzag-like combining structure and compared it with other coherent combining methods. Two and six angled-grating broad-area lasers are fabricated and coherently combined by use of the proposed method. The high contrast interference fringes within an overall single lobe envelope in the measured far field prove that the emitters in the array are indeed coherently combined. By p-side-down bonding, we obtained over l W output power with over 90% combining efficiency in the two coherently combined lasers.

关键词： semiconductor lasers angled-grating broad-area lasers coherent beam combining high power highbrightness

在线全文

学校读者我要写书评

暂无评论

基于频段导向的PWM逆变器主动热管理控制

电力自动化设备 2017年第5期37卷 34-39页

作者：黄守道陈叶宇刘平荣飞湖南大学电气与信息工程学院湖南长沙410082

对绝缘栅双极型晶体管(IGBT)进行主动热管理,是提高器件使用寿命和降低逆变器运行维护成本的有效途径,然而,输出频率对器件的结温性能的影响往往被忽略。因此,基于频段导向,针对电压型PWM逆变器提出了一种主动热管理控制的新方法。通过... 详细信息

对绝缘栅双极型晶体管(IGBT)进行主动热管理,是提高器件使用寿命和降低逆变器运行维护成本的有效途径,然而,输出频率对器件的结温性能的影响往往被忽略。因此,基于频段导向,针对电压型PWM逆变器提出了一种主动热管理控制的新方法。通过损耗计算和实时结温观测,在低输出频率区域采用滞环控制调节开关频率,在高输出频率区域对电流进行限幅。仿真结果表明,该控制策略能有效降低器件平均结温和结温波动,提高热容量利用率,改善逆变器可靠性,延长器件使用寿命。

关键词：电压型PWM逆变器绝缘栅双极型晶体管可靠性主动热管理结温控制频段导向

Gas accumulation mechanism in Denglouku Formation of Changling fault depression, southern Songliao Basin, China

在线全文

学校读者我要写书评

暂无评论

Global Geology 2017年第3期20卷 170-175页

作者： YANG Guang FAN yeyu LIU Changli College of Earth Sciences Jilin University Changchun 130061 China

The Changling gas field is occurs in tight sandstone reservoirs of the Lower Cretaceous Denglouku Formation in the Changling fault depression,southern Songliao Basin,China,which constitutes a new gas-producing area in the depression. Using information on the source-reservoir-cap rock assemblage of the Denglouku Formation,fault activity,and single well burial history of well CS1,together with data on reservoir fluid inclusion and laser Raman spectroscopy,we described the formation of the Changling gas field and determine that this fault depression did not possess suitable conditions for hydrocarbon generation. Coal-derived methane generated from underlying hydrocarbon source rock accumulated in the Lower Cretaceous Yingcheng Formation. At the end of the Late Cretaceous Qingshankou Stage,underwater volcanic eruptions occurred in the northern part of the Changling gas field near Qian'an,resulting in the reactivation of deep faults. Mantle-sourced inorganic CO2 migrated along faults to hydrocarbon gas reservoirs in volcanic rocks of the Yingcheng Formation; Meanwhile,displaced methane( hydrocarbon gas) migrated upward to sand reservoirs of the Denglouku *** methane accumulated and formed secondary gas reservoirs,Therefore fault activity was the main factor controlling the generation of gas reservoirs in the Denglouku Formation. The main accumulation period of the Yingcheng hydrocarbon gas reservoirs was 82 Ma. Whereas gas reservoir formation in the overlying Denglongku Formation was 79 Ma,slightly later than the time of formation of the Yingcheng gas reservoir in CS1 well *** 79 Ma,the burial depth of the Denglouku Formation was 1 800--2 000 m,the diagenesis is relatively weak and the physical properties of the reservoir are relatively favorable for accumulation. This period is not only at gas generation peak time of three sets of source rock but also at the reactivation of deep faults during the formation of fault-bound depressions,thereby providing favor

关键词： Changling gas field volcanic reservoir Denglouku Formation inorganic CO2 replacement effect

城郊有机农场生态系统服务评估——以北京市为例

在线全文

学校读者我要写书评

暂无评论

生态学报 2021年第22期41卷 9076-9083页

作者：华野毓黄甘霖北京师范大学地表过程与资源生态国家重点实验室人与环境系统可持续研究中心北京100875 北京师范大学地理科学学部自然资源学院土地资源与区域发展研究中心北京100875

快速城市化对周边农业区域造成巨大影响。都市农业能够提供世界上20%的食品,为粮食安全做出了重要贡献。在全球环境危机的背景下,农业生态保护问题得到了越来越多的关注。有机农场在生产过程中遵循自然规律,不使用化学合成的农药、化肥... 详细信息

快速城市化对周边农业区域造成巨大影响。都市农业能够提供世界上20%的食品,为粮食安全做出了重要贡献。在全球环境危机的背景下,农业生态保护问题得到了越来越多的关注。有机农场在生产过程中遵循自然规律,不使用化学合成的农药、化肥和生长调节剂等物质,是实现生态农业的有效模式之一。城郊有机农场得益于临近都市的地理位置,常常同时提供参观、采摘等休闲服务,加深了游客对农业的理解和与自然的连结。目前,国内研究大多关注有机食品健康、有机农业政策和环境效益,但往往忽视其提供的经济和文化价值。基于生态系统服务与人类福祉关系的概念框架,以北京市为例,从供给、调节、文化三个方面全面评估城郊有机农场的生态系统服务。结果显示,截至2019年北京市城郊共有271家有机农场,种植面积1.09万hm^(2),占北京市耕地面积的5.1%。供给服务价值为16.12亿元。调节服务方面,提供了2140万元的土壤碳固存价值,并且比相同面积的常规农场减少了16.4万GJ能量、2639tCO_(2)、202tSO_(2)和29tPO_(2)的排放。文化服务方面,提供了1.189亿元的采摘服务,并促成了120余次农夫市集和50余次讲座、沙龙的宣传教育活动,积累了社会资本。本研究尝试通过直观的数据全面反映城郊有机农场对收益者的多种惠益,凸显了在有限的供给服务之外,城郊有机农场在休闲游憩和教育宣传等文化服务的贡献,为深入理解城郊有机农场生态系统服务提供基础,有助于进一步提高农业管理的精细程度和城市的可持续性。

关键词：都市农业有机农场生态系统服务

“寂寞地鸣动”:《野草》与20世纪20年代新诗坛的对话

在线全文

学校读者我要写书评

暂无评论

广东社会科学 2023年第4期 182-193页

作者：宋夜雨山东大学文学院济南250100

《野草》不仅是鲁迅自我的“心声”,同时也内含着与20世纪20年代新诗坛的对话,无论是《我的失恋》对徐志摩的讽刺,还是针对张耀翔“亡国之音”的回应,鲁迅都在表明自我以“心声”为根底的诗歌态度,这种态度不仅与《野草》的写作缘起相呼... 详细信息

《野草》不仅是鲁迅自我的“心声”,同时也内含着与20世纪20年代新诗坛的对话,无论是《我的失恋》对徐志摩的讽刺,还是针对张耀翔“亡国之音”的回应,鲁迅都在表明自我以“心声”为根底的诗歌态度,这种态度不仅与《野草》的写作缘起相呼应,同时也在一定程度上影响到了《野草》的文体选择和形式实践。《秋夜》作为《野草》的首篇首先就设定了鲁迅对自我内在声音的找寻,而《一觉》作为《野草》的终篇,鲁迅又再次强调“寂寞地鸣动”的诗歌意义。对“心声”的探求由此形成了首尾的呼应,在呈现《野草》完整的组织形式的同时,更串联起了《野草》内在的诗歌精神。鲁迅不仅借此化解了自我关于“死”的困惑,更从中整理出如何“活”的“生”的勇气和态度。由此,鲁迅完成了由“野草”的自我到“杂文”的自我的思想进化。

关键词：鲁迅《野草》徐志摩张耀翔诗歌态度新诗坛

同方期刊数据库

早期新诗与现代中国的“抒情”起源——以田汉、周作人的抒情实践为中心

在线全文

学校读者我要写书评

暂无评论

文学评论 2021年第3期 116-124页

作者：宋夜雨南京师范大学文学院

早期新诗的兴起,不仅是一种现代文类的生成,更设定了现代中国的"抒情"起源。新诗的抒情机制,对于有着情感化自我表达需求的五四青年,具有强烈的吸引力。随着"五四"的落潮,不仅情感化的主体生成方式失效,与之相应的抒情方法也失去意义。... 详细信息

早期新诗的兴起,不仅是一种现代文类的生成,更设定了现代中国的"抒情"起源。新诗的抒情机制,对于有着情感化自我表达需求的五四青年,具有强烈的吸引力。随着"五四"的落潮,不仅情感化的主体生成方式失效,与之相应的抒情方法也失去意义。在相关的应对方案中,田汉等人不仅看到新诗对苦闷的抒发,还从苦闷中整合出一种新的抒情可能性。而周作人在对新诗展开系统批判的同时,又通过翻译与创作为早期新诗植入了一种象征化的抒情风格,在完成新诗抒情改造的同时,也完成了自我情感世界的再造。

关键词：早期新诗抒情新浪漫主义田汉周作人

Some synergetic therapy strategies for overcoming hypoxia for photodynamic therapy of cancer

在线全文

学校读者我要写书评

暂无评论

Journal of Cancer Metastasis and Treatment 2023年第1期9卷 112-130页

作者： Tian Chai Ya Li yeyu Cai Yiyang Li Necla Kenar Hyun Soo Lim Hunter Temple Xiangyu Chen Wei Chen Department of Radiology The Second Xiangya Hospital of Central South UniversityChangsha 410011HunanChina Department of CT/MRI Xi’an Ninth HospitalXi’an 710000ShaanxiChina Department of Physics The University of Texas at ArlingtonArlingtonTX 76019USA Xiangya School of Medicine Central South UniversityChangsha 410011HunanChina Department of Physics Arts and Science FacultyKocaeli UniversityUmuttepe CampusIzmit-Kocaeli 41380Turkey Department of Electrical-Electronics Engineering Applied Science and Technology FacultySakarya University Esentepe CampusAdapazarı54187Turkey

As an emerging strategy in antitumor therapy,photodynamic therapy(PDT)has garnered significant attention in recent years for the treatment of various malignant *** is due to its low side effects,superior spatial selectivity,and maximum preservation of normal tissue ***,the hypoxic nature of tumors,continuous oxygen consumption,and microvascular damage associated with PDT treatment have impeded its ***,the focus of antitumor therapy has shifted towards enhancing the efficacy of PDT by addressing tumor *** objective of this review is to assess and summarize the recent advancements in tumor treatment using synergistic therapy strategies(PDT+X,where X represents photothermal therapy,chemodynamic therapy,chemotherapy,immunotherapy,Photoacoustic therapy,etc.)that overcome ***,this review aims to outline the advantages and disadvantages of various collaborative methods for improving tumor hypoxia,while also discussing the challenges that lie ahead for future research.

关键词： Nanomaterials photosensitizer photodynamic therapy deep tumor hypoxia

Nuclear magnetic resonance spectroscopy is highly sensitive for lipid-soluble metabolites

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2013年第22期8卷 2103-2110页

作者： Haiyang Dai Bikai Hong Zhifeng Xu Lian Ma Yaowen Chen yeyu Xiao Renhua Wu Department of Medical Imaging Second Affiliated HospitalShantou University Medical College Department of Medical Imaging Huizhou Municipal Central Hospital Department of Radiology the First People's Hospital of Foshan Department of Pediatrics Second Affiliated HospitalShantou University Medical College Central Laboratory Shantou University

Although the water-soluble metabolite profile of human mesenchymal stem cells is known, the lipid profile still needs further investigation. In this study, methanol-chloroform was used to extract lipid-soluble metabolites and perchloric acid was used to extract water-soluble metabolites. Fur- thermore, a dual phase extraction method using methanol-chloroform and water was used to obtain both water and lipid fractions simultaneously. All metabolite extractions were analyzed on a 9.4T high-resolution nuclear magnetic resonance spectrometer. Metabolite resonance peaks were as- signed in the acquired spectra according to the chemical shift, and the extraction efficiency of dif- ferent methods was compared. Results showed that in the spectra of water-soluble extracts, major metabolites comprised low molecular weight metabolites, including lactate, acetic acid, fatty acids, threonine, glutamic acid, creatine, choline and its derivatives, while in the spectra of lipid-soluble extracts, most metabolites were assigned to fatty acids. Among the different extraction procedures, perchloric acid was more efficient in extracting water-soluble metabolites and methanol-chloroform was efficient in extracting organic components compared with the dual phase extraction method. Nuclear magnetic resonance spectroscopy showed that as low as 0.7 mg organic yield was enough to obtain clear resonance peaks, while about 6.0 mg water-soluble yield was needed to obtain rela- tively favorable spectral lines. These results show that the efficiency of extracting water and lipid fractions is higher using perchloric acid and methanol-chloroform compared with dual phase ex- traction and that nuclear magnetic resonance spectroscopy is highly sensitive for analyzing lipid-soluble extracts.

关键词： neural regeneration nuclear magnetic resonance spectroscopy mesenchymal stem cells metabo-lite profiles extraction method optimization water-soluble lipid-soluble perchloric acid metha-nol-chloroform grants-supported paper neuroregeneration