检索结果-南通市图书馆

Realization of warm white light emitting in single phase Gd(P_(x)V_(1−x))O_(4):y at% Sm^(3+),1 at% Bi^(3+) phosphor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2022年第4期40卷 559-566,I0002页

作者： Chao Dou Yanzhen Yin Fei Zheng Zhen Wang Shijia Sun chen Hu yang che Bing Teng Degao Zhong College of Physics University-Industry Joint Center for Ocean Observation and Broadband CommunicationQingdao UniversityQingdao 266071China National Demonstration Center for Experiment Applied Physics Education(Qingdao University) Qingdao 266071China Shandong Provincial University Key Laboratory of Optoelectrical Material Physics and Devices Qingdao 266071China

A series of single phase,warm white light emitting phosphors,Gd(P_(x)V_(1−x))O_(4):y at%Sm^(3+),with 1 at%Bi^(3+) doping concentration were synthesized by high temperature solid state method in this work.The experimental results indicate broadband cyan emission of Bi^(3+)and characteristic orange-red emission of Sm^(3+)can be effectively tuned by changing the ratios of PO^(3−)_(4)/VO^(3−)_(4) in Gd(P_(x)V_(1−x))O_(4):1 at%Sm^(3+),1 at%Bi^(3+),and the energy transfer process among VO^(3−)_(4),Sm^(3+),Bi^(3+) also can be adjusted.Based on this,warm white light emitting can be realized by further optimizing the doping concentration of Sm^(3+) in the phosphors.At 423 K,the PL intensity of Gd(P_(0.7)V_(0.3))O_(4):2 at%Sm^(3+),1 at%Bi^(3+) remains~84.3%of the initial value at 293 K,while the measured quantum efficiency is 67.8%.EL spectrum analysis results of the fabricated white light emitting diode(wLED)based on a 310 nm UV-chip and Gd(P_(0.7)V_(0.3))O4:2 at%Sm^(3+),1 at%Bi^(3+)phosphors imply low correlated color temperature(3132 K)and appropriate color-rending index(R_(a)=82.7).These results demonstrate that Gd(P_(0.7)V_(0.3))O4:2 at%Sm^(3+),1 at%Bi^(3+)is a good candidate for manufacturing UV-activated warm white light emitting diodes.

关键词： Warm white light emitting Single phase phosphor Color-tunability Rare earths

在线全文

学校读者我要写书评

暂无评论

工程认证背景下能源与动力工程实验教学改革

实验室研究与探索 2024年第5期43卷 211-214页

作者：叶竹杨澈杜涛孙文强东北大学冶金学院沈阳110819

为强化以学生为中心的教学改革,通过阶段性、导向性、系统性课程目标的设计,双碳产教融合教学内容的更新,以及微课、6S标准化改善实验教学环境的引入,以知识应用能力为考核重点的论文式报告考核,闭环的持续改进机制构建等方式对实验教... 详细信息

为强化以学生为中心的教学改革,通过阶段性、导向性、系统性课程目标的设计,双碳产教融合教学内容的更新,以及微课、6S标准化改善实验教学环境的引入,以知识应用能力为考核重点的论文式报告考核,闭环的持续改进机制构建等方式对实验教学过程进行全面改革,逐步培养学生掌握能源与动力实验研究的基本方法。通过学生独立开展实验研究方案制定、实施,培养数据分析处理及反馈的能力,提高了实验课程的教学价值。

关键词：人才培养产教融合微课课程评价

在线全文

学校读者我要写书评

暂无评论

储气库掩埋井口精确磁定位技术

石油钻采工艺 2024年第1期46卷 60-66,118页

作者：车阳方明星贺梦琦王辰龙黄洋王开龙中国石油集团工程技术研究院有限公司非常规油气工程研究所北京102206 油气钻完井技术国家工程研究中心北京102206 中国石油大学(北京)石油工程学院北京102249 中国石油辽河油田储气库公司辽宁盘锦124000 东北石油大学电气工程信息学院黑龙江大庆163319

在建设地下储气库时,首先应确保储气库的密封性,要确定废弃掩埋老井的位置并对其进行封堵,常见测量手段存在一定的误差和不确定性。为此提出一种掩埋井口精确磁定位技术,通过主动激发掩埋井口周围的磁场分布特征,结合反向散射信号提取解... 详细信息

在建设地下储气库时,首先应确保储气库的密封性,要确定废弃掩埋老井的位置并对其进行封堵,常见测量手段存在一定的误差和不确定性。为此提出一种掩埋井口精确磁定位技术,通过主动激发掩埋井口周围的磁场分布特征,结合反向散射信号提取解算,实现精确测量和定位。硬件系统主要由发射器、接收器和计算装置组成,采用信号提取、坐标转换、平面定位、垂向定位等定位算法可以锁定被埋井口位置,同时从算法方面分析了绞车、回路、发射器等可能会对磁定位结果产生的干扰。该技术应用于辽河油田国家级自然保护区的桥下S井定位作业中,共钻进4口浅井,交替测量2次后成功锁定S井井口位置,随后一次开挖成功,与测量坐标的误差小于0.5 m。该技术解决了长期困扰油田的储气库无法顺利建库的难题,为掩埋井口精确定位提供了可靠思路,具有指导意义。

关键词：储气库掩埋井口磁定位技术反向散射信号精确测量

维普期刊数据库博看期刊

Invasion or Construction-A Brief Introduction on Trump Immigration Policy in Higher Education Circles

在线全文

学校读者我要写书评

暂无评论

Proceedings of Business and Economic Studies 2019年第2期2卷 1-2页

作者： yang che School of Government Central University of Finance and EconomicsBeijing100081China

The new immigration policies introduced by Trump administration have saturated the world's screens,which have gained a mixed reception from the higher education circles amid considerable controversy,exacerbating the plight of the brain drains,hurting the enthusiasm of those who have a strong desire to live in the USA,particularly the college leavers,and triggering a decline in the quality of education for foreign students,which could be a game-changer in the competition pattern of higher education and loom large.On this occasion,in matters of China,some more robust methodologies are to jump at the chance,attract qualified personnel and present some more aggressive human resources strategies.

关键词： Trump Immigration Policy higher education talent introduction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

结核病实验室信息化管理平台的建设与应用

A simple technique for suprachoroidal space injection of triamcinolone acetonide in treatment of macular edema

科学与信息化 2024年第9期 150-152页

作者：樊明锁史宏博车洋宁波市疾病预防控制中心浙江宁波 315000

目的:建立一个与各级结核病防治机构互联互通的结核病实验室信息化管理平台.方法:改造定点医疗机构结核病实验室系统数据交换接口,并采用分级账号权限机制来实现对多方信息的共享和保护.结果:通过结核病实验室信息平台的构建及应用,完... 详细信息

目的:建立一个与各级结核病防治机构互联互通的结核病实验室信息化管理平台.方法:改造定点医疗机构结核病实验室系统数据交换接口,并采用分级账号权限机制来实现对多方信息的共享和保护.结果:通过结核病实验室信息平台的构建及应用,完成十万余条检测数据的高质量交互工作,使结核病防治各项工作质量大幅提高.结论:基于该管理平台的成功构建及广泛应用,实现了结核病实验室检测数据的自动化管理和共享,提高了数据交互的准确性、安全性和及时性,对结核病疫情的有效防控具有重要意义.

关键词：结核病实验室信息平台互联互通定点医疗机构

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2022年第12期15卷 2017-2021页

作者： Dan-Dan Zhang Dan-yang che Dong-Qing Zhu Department of Ophthalmology Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai 200001China Shanghai Key Laboratory of Orbital Diseases and Ocular Oncology Shanghai 200001China

AIM:To introduce a simple resistance controlled suprachoroidal space(SCS)injection technique using a disposable 30-gauge needle connected to a 1 m L syringe and evaluate the effectiveness and applicability of this technique in the treatment of macular edema.METHODS:A total of 20 patients with various types of macular edema were subjected to a resistance controlled SCS injection of triamcinolone acetonide(TA)with a disposable 30-gauge needle connected to a 1 m L syringe.This technique allows the easy and smooth injection of the TA only once the tip of the needle reached the potential SCS which was indicated by the lower resistance on the plunger.The main outcome measures were anterior segment spectral-domain optical coherence tomography(AS-OCT)measurements post-operation immediately and central subfield thickness(CST),best-corrected visual acuity(BCVA),and intraocular pressure(IOP)measurements at 3mo postoperation.RESULTS:AS-OCT examination showed the expansion of the SCS near the injection site immediately after SCS injection.At three months of follow-up,as compared to the baseline,the mean CST was significantly decreased from 535.0±157.24 to 319.55±127.30μm(P<0.001),the mean BCVA was significantly improved from 1.05±0.41 to 0.73±0.41 log MAR(P<0.001),and the mean IOP was not significantly different,from 15.05±2.54 to 15.85±3.60 mm Hg(P=0.185).Any complication related to the injection procedure including cataract,choroidal and retinal hemorrhage,retinal detachment,or endophthalmitis was not observed in this study.CONCLUSION:The simple and minimally invasive technique of SCS injection of TA with a disposable 30-gauge needle connected to a 1 m L syringe is useful and applicable for macular edema.

关键词： suprachoroidal space injection needle macular edema triamcinolone acetonide

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

储气库救援井磨料水射流管外开窗试验研究

石油机械 2024年第5期52卷 25-31页

作者：任宪可郭爽赵昌明张强王国强车阳李敬彬中国石油集团工程技术研究院有限公司东北石油大学机械科学与工程学院中国石油大庆油田有限责任公司采油工程研究院中国石油大学(北京)油气资源与勘探国家重点实验室

针对井筒不完整和存在落鱼的废弃事故老井出现井下封堵困难和气窜问题,如何实现有效封堵已成为老井改造储气库的关键。为此开展了储气库救援井磨料水射流钻杆成孔试验。试验结果表明:随着喷射距离的增大,单位时间内钻杆成孔深度显著减小... 详细信息

针对井筒不完整和存在落鱼的废弃事故老井出现井下封堵困难和气窜问题,如何实现有效封堵已成为老井改造储气库的关键。为此开展了储气库救援井磨料水射流钻杆成孔试验。试验结果表明:随着喷射距离的增大,单位时间内钻杆成孔深度显著减小;随着喷射压力的增大,钻杆成孔所需的时间缩短;钻杆成孔所需的最佳磨料质量分数为6%~8%,磨料粒径分布在40~60目范围内,可实现较好的破坏效果。通过正交试验分析认为,钻杆成孔的极限喷距随着喷射压力的增大而增大,随着喷射距离增大而减小;为缩短作业时间,应调整参数为高喷射压力(>25 MPa)和短喷射距离(<20 cm)。所得结论可为现场作业提供技术借鉴。

关键词：储气库救援井落鱼封堵磨料水射流喷砂射孔参数优化

Artificial intelligence improves accuracy, efficiency, and reliability of a handheld infrared eccentric autorefractor for adult refractometry

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2022年第4期15卷 628-634页

作者： Yi-Ting Cao Dan-yang che Yi-Lei Pan Yun-Li Lu Chong-yang Wang Xiao-Li Zhang Yun-Fei yang Ke-Ke Zhao Ji-Bo Zhou Department of Ophthalmology Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai 200011China Shanghai Key Laboratory of Orbital Diseases and Ocular Oncology Shanghai 200011China Shanghai MediWorks Precision Instruments Company Limited Shanghai 201112China Department of Ophthalmology Shanghai Children’s Medical CenterShanghai Jiao Tong University School of MedicineShanghai 200127China

AIM: To evaluate the accuracy, efficiency, and reliability of a handheld infrared eccentric autorefractor(h ICA) with artificial intelligence(AI) by comparing its refraction measurements to those recorded using h ICA and a clinical table-mounted automatic refractor(TAR).METHODS: A cross-sectional study using three optometers, including h ICA with or without AI and TAR, for refractometry of adults(aged 19-49 years old) with no signs of ocular disease or trauma in the absence of cycloplegia. Right and left eye refraction data were recorded, including the spherical equivalent(SE), diopter of spherical power(DS), diopter of cylindrical power(DC) decomposed into vectors J0 and J45, and measurement times. To avoid analytical difficulties associated with the interdependence of observations between eyes from the same individual, the Generalized Estimation Equation was used to compare the SE, DS, J0 and J45 measurements, and the times thereof, among the different groups. The intraclass correlation coef f icient(ICC) and Spearman’s rank correlation coefficient were used to evaluate correlations among the measurements recorded by the three different instruments. Bland-Altman were used to analyze the precision of the equipment by the agreement. RESULTS: A total of 70 patients(140 eyes;mean age: 31.37 y;range: 19-49 y) were assessed using refractometry. In a brightly lit environment, there was no significant difference between the mean SE recorded using TAR and that recorded using h ICA with AI or without AI(both P>0.05). In an intense-light environment, h ICA equipped with AI showed a better detection rate than without AI. Light intensity had a greater effect on dioptric measurements recorded using h ICA without AI(P<0.001) than on those recorded using the one equipped with AI(P<0.05). Measurement times varied significantly between the different light intensities and instruments(P<0.05).CONCLUSION: For the normal human eyes, AI may improve the accuracy, efficiency, and reliability of measurements recorded using h ICA in vari

关键词： dioptric measurement artificial intelligence equipment design infrared eccentric autorefractor

Biogenic volatile organic compounds dominated the near-surface ozone generation in Sichuan Basin,China,during fall and wintertime

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第7期141卷 215-224页

作者： Dasheng Huang Qing Li Yan Han Shi-Yong Xia Jiawei Zhou Hanxiong che Keding Lu Fumo yang Xin Long yang chen Research Center for Atmospheric Environment Chongqing Institute of Green and Intelligent TechnologyChinese Academy of SciencesChongqing 400714China Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714China College of Resources and Environment Chongqing SchoolUniversity of the Chinese Academy of Sciences(UCAS Chongqing)Chongqing 400714China College of Environmental and chemical Engineering Chongqing Three Gorges UniversityChongqing 404199China Key Laboratory for Urban Habitat Environmental Science and Technology School of Environment and EnergyPeking University Shenzhen Graduate SchoolLishui RoadNanshan DistrictShenzhen 518055China SKL-ESPC and BIC-ESAT College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China College of Architecture&Environment Sichuan UniversityChengdu 610065China

The complex air pollution driven by both Ozone(O_(3))and fine particulate matter(PM2.5)sig nificantly influences the air quality in the Sichuan Basin(SCB).Understanding the O_(3)for mation during autumn and winter is necessary to understand the atmospheric oxidative capacity.Therefore,continuous in-site field observations were carried out during the late summer,early autumn and winter of 2020 in a rural area of Chongqing.The total volatile organic compounds(VOCs)concentration reported by a Proton-Transfer-Reaction Time-of Flight Mass Spectrometry(PTR-ToF-MS)were 13.66±9.75 ppb,5.50±2.64 ppb,and 9.41±5.11 ppb in late summer,early autumn and winter,respectively.The anthropogenic VOCs(AVOCs)and biogenic VOCs(BVOCs)were 8.48±7.92 ppb and 5.18±2.99 ppb in late sum mer,3.31±1.89 ppb and 2.19±0.93 ppb in autumn,and 6.22±3.99 ppb and 3.20±1.27ppb in winter.A zero-dimensional atmospheric box model was employed to investigate the sensitivity of O_(3)-precursors by relative incremental reactivity(RIR).The RIR values of AV OCs,BVOCs,carbon monoxide(CO),and nitrogen oxides(NOx)were 0.31,0.71,0.09,and-0.36 for late summer,0.24,0.59,0.22,and-0.38 for early autumn,and 0.30,0.64,0.33 and-0.70 for winter,and the results showed that the O_(3)formation of sampling area was in the VOC-limited region,and O_(3)was most sensitive to BVOCs(with highest RIR values,>0.6)This study can be helpful in understanding O_(3)formation and interpreting the secondary formation of aerosols in the winter.

关键词： VOCs PTR-MS Model Ozone