检索结果-南通市图书馆

Design of an on‑chip wavelength conversion device assisted by an erbium‑ytterbium co‑doped waveguide amplifier

在线全文

学校读者我要写书评

暂无评论

Frontiers of Optoelectronics 2024年第2期17卷 51-60页

作者： Chen zhou Xiwen He Mingyue Xiao Deyue Ma Weibiao Chen zhiping zhou School of Physical Sciences University of Science and Technology of ChinaHefei 230026China Aerospace Laser Technology and System Department Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Hangzhou Aijie Optoelectronic Technology Co.Ltd. Hangzhou 311400China

In current documented studies,it has been observed that wavelength converters utilizing AlGaAsOI waveguides exhibit suboptimal on-chip wavelength conversion efficiency from the C-band to the 2μm band,generally falling below−20.0 *** address this issue,we present a novel wavelength conversion device assisted by a waveguide amplifier,incorporating both AlGaAs wavelength converter and erbium-ytterbium co-doped waveguide amplifier,thereby achieving a notable conversion efficiency exceeding 0 *** noteworthy enhancement in efficiency can be attributed to the specific dispersion design of the AlGaAs wavelength converter,which enables an upsurge in conversion efficiency to−15.54 dB under 100 mW of pump ***,the integration of an erbium-ytterbium co-doped waveguide amplifier facilitates a loss compensation of over 15 *** the use of external optical amplifiers,this device enables efficient and high-bandwidth wavelength conversion,showing promising applications in various fields,such as optical communication,sensing,imaging,and beyond.

关键词： Silicon-based optoelectronics Wavelength conversion Waveguide amplifier 2μm band

日粮添加不同比例果寡糖对育肥猪生长性能和养分表观消化率的影响

在线全文

学校读者我要写书评

暂无评论

中国饲料 2024年第10期 39-42页

作者：周治平戈胜湖北省宜都市畜牧服务中心湖北宜都443300

为研究果寡糖对育肥猪生长性能和养分表观消化率的影响,本试验选用200头健康育肥猪为研究对象,共分为4组,每组5个重复,即5栏,每个重复(栏)10头,对照组饲喂基础日粮,试验组分别在基础日粮中添加0.1%、0.5%和1%果寡糖,试验为期40 d。试验... 详细信息

为研究果寡糖对育肥猪生长性能和养分表观消化率的影响,本试验选用200头健康育肥猪为研究对象,共分为4组,每组5个重复,即5栏,每个重复(栏)10头,对照组饲喂基础日粮,试验组分别在基础日粮中添加0.1%、0.5%和1%果寡糖,试验为期40 d。试验结果表明,添加果寡糖对育肥猪的采食量没有显著影响,但是显著增加了育肥猪的平均日增重,降低了料重比和腹泻率,添加0.1%、0.5%和1%果寡糖的育肥猪平均日增重比对照组分别显著提高9%、24%和23%(P0.05),添加1%果寡糖处理的育肥猪肠道消化酶活性最高;因此,添加不同比例果寡糖显著提高了育肥猪对干物质、粗纤维和粗脂肪的消化率,其中,添加0.5%和1%果寡糖处理的育肥猪对干物质、粗纤维和粗脂肪的消化率与对照组相比增幅分别为9%~10%、20%~26%和14%~19%(P<0.05),而对粗灰分和粗蛋白质的消化率无显著影响。综上所述,在日粮中添加0.5%~1%含量的果寡糖可以显著提高育肥猪肠道消化酶活性,增加对养分的表观消化率,从而提高饲料转化率,提高生长性能。

关键词：果寡糖育肥猪生长性能消化酶表观消化率

在线全文

学校读者我要写书评

暂无评论

硫酸亚铁铵滴定法测定硫铁矿中高含量砷

冶金分析 2024年第2期44卷 66-70页

作者：黄葡英孙福林周志平广东省科学院工业分析检测中心

毒砂作为主要的砷矿物，常与以黄铁矿为主的硫铁矿紧密共生。在毒砂和硫铁矿伴生的矿床选矿中，硫铁矿中砷含量的高低严重影响硫铁矿的品位和应用。实验采用硝酸-氯酸钾饱和溶液溶解样品，加入一定量的硫酸加热冒浓白烟驱除硝酸，然后... 详细信息

毒砂作为主要的砷矿物，常与以黄铁矿为主的硫铁矿紧密共生。在毒砂和硫铁矿伴生的矿床选矿中，硫铁矿中砷含量的高低严重影响硫铁矿的品位和应用。实验采用硝酸-氯酸钾饱和溶液溶解样品，加入一定量的硫酸加热冒浓白烟驱除硝酸，然后在盐酸介质中以硫酸铜为催化剂，用次亚磷酸钠将As5+还原为As0(单质砷),通过一定的水浴时间和单质砷沉淀静置时间，过滤使砷与其他杂质分离，用过量的重铬酸钾标准滴定溶液溶解As0,最后用硫酸亚铁铵标准滴定溶液滴定过量的重铬酸钾标准滴定溶液，从而准确测定硫铁矿中高含量砷(1%～10%)。方法用于两个硫铁矿实际样品中砷的测定，结果的相对标准偏差(RSD,n=9)分别为0.78%和0.51%;并与碘滴定法分析结果吻合。方法避免了采用剧毒试剂三氧化砷测定硫铁矿中高含量砷。

关键词：硫铁矿砷硫酸亚铁铵滴定法毒砂

Silicon-based optoelectronics for general-purpose matrix computation:a review

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Advanced Photonics 2022年第4期4卷 1-13页

作者： Pengfei Xu zhiping zhou Peking University State Key Laboratory of Advanced Optical Communication Systems and NetworksSchool of ElectronicsBeijingChina Chinese Academy of Sciences Shanghai Institute of Optics and Fine MechanicsShanghaiChina

Conventional electronic processors,which are the mainstream and almost invincible hardware for computation,are approaching their limits in both computational power and energy efficiency,especially in large-scale matrix *** combining electronic,photonic,and optoelectronic devices and circuits together,silicon-based optoelectronic matrix computation has been demonstrating great capabilities and *** computation is one of the few general-purpose computations that have the potential to exceed the computation performance of digital logic circuits in energy efficiency,computational power,and ***,electronic processors also suffer from the tremendous energy consumption of the digital transceiver circuits during high-capacity data *** review the recent progress in photonic matrix computation,including matrix-vector multiplication,convolution,and multiply–accumulate operations in artificial neural networks,quantum information processing,combinatorial optimization,and compressed sensing,with particular attention paid to energy *** also summarize the advantages of siliconbased optoelectronic matrix computation in data interconnections and photonic-electronic integration over conventional optical computing *** toward the future of silicon-based optoelectronic matrix computations,we believe that silicon-based optoelectronics is a promising and comprehensive platform for disruptively improving general-purpose matrix computation performance in the post-Moore’s law era.

关键词： silicon-based optoelectronics photonic matrix computation optical interconnections photonic-electronic integration

桂北地区建筑底层架空对夏季校园微气候的影响

在线全文

学校读者我要写书评

暂无评论

建筑科学 2024年第6期40卷 107-115页

作者：周志平徐紫霞郑文亨尹应德桂林电子科技大学建筑与交通工程学院广西桂林541004

为研究桂北地区建筑底层架空对夏季校园微气候的影响,选取桂北地区某高校内的底层架空教学楼群为研究对象,通过现场实测获取校园夏季微气候数据,分析建筑底层架空对微气候的影响规律,并用数值模拟比较不同架空高度对校园热舒适性的调节... 详细信息

为研究桂北地区建筑底层架空对夏季校园微气候的影响,选取桂北地区某高校内的底层架空教学楼群为研究对象,通过现场实测获取校园夏季微气候数据,分析建筑底层架空对微气候的影响规律,并用数值模拟比较不同架空高度对校园热舒适性的调节效果。结果表明:与架空外阳光直射地相比,架空层起到降温增湿的作用,其平均降温增湿效果分别为2.3℃、4.18%;敞开型架空对改善风环境的效果显著,平均风速为1.25 m/s;架空层下的生理等效温度(PET)比室外降低12.8℃,营造了舒适稳定的空间环境;当架空高度为3 m时,降温增湿效果最好,整体热舒适性最佳;当架空高度为5 m时,通风效果最好。研究结果为桂北地区校园建筑规划设计和改善校园微气候舒适性提供参考。

关键词：桂北地区校园微气候建筑架空现场测试计算流体力学

Silicon-based optoelectronics:progress towards large scale optoelectronic integration and applications

在线全文

学校读者我要写书评

暂无评论

Frontiers of Optoelectronics 2022年第2期15卷 179-180页

作者： Dingshan Gao zhiping zhou Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Optical Communication Systems and Networks School of ElectronicsPeking UniversityBeijing 100871China

In the past half century,silicon-based microelectronics and optical fiber communication have triggered a far-reaching information technology revolution,which has moved human society into a high-speed information *** demand for communication capacity and speed is growing *** the other hand,data center and high-performance computing are facing bottlenecks of speed,bandwidth,and energy consumption of electrical interconnections.

关键词： interconnection optoelectronic communication

Unsupervised Time Series Segmentation: A Survey on Recent Advances

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

Computers, Materials & Continua 2024年第8期80卷 2657-2673页

作者： Chengyu Wang Xionglve Li Tongqing zhou zhiping Cai College of Computer National University of Defense TechnologyChangsha410073China

Time series segmentation has attracted more interests in recent years,which aims to segment time series into different segments,each reflects a state of the monitored *** there have been many surveys on time series segmentation,most of them focus more on change point detection(CPD)methods and overlook the advances in boundary detection(BD)and state detection(SD)*** this paper,we categorize time series segmentation methods into CPD,BD,and SD methods,with a specific focus on recent advances in BD and SD *** the scope of BD and SD,we subdivide the methods based on their underlying models/techniques and focus on the milestones that have shaped the development trajectory of each *** a conclusion,we found that:(1)Existing methods failed to provide sufficient support for online working,with only a few methods supporting online deployment;(2)Most existing methods require the specification of parameters,which hinders their ability to work adaptively;(3)Existing SD methods do not attach importance to accurate detection of boundary points in evaluation,which may lead to limitations in boundary point *** highlight the ability to working online and adaptively as important attributes of segmentation methods,the boundary detection accuracy as a neglected metrics for SD methods.

关键词： Time series segmentation time series state detection boundary detection change point detection

The"Magical Chinese Herbal Medicine"Series

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

China Book International 2023年第3期 116-117页

作者： zhou zhiping China Popular Science Writers Association

This series is writtenbyexperts to introducethe culture of Chinese herbal medicine to *** talking about the stories of more than 120 interesting Chinese herbal medicines,this series leads children into the realm of tr... 详细信息

关键词： herbal Medicine Magic

急性后循环大血管闭塞血管内治疗预后的危险因素分析

维普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

中国卫生标准管理 2024年第7期15卷 96-100页

作者：朱国吴达周志平宋金海沈春升齐明江苏大学附属宜兴医院神经外科江苏宜兴214200

目的探讨急性后循环大血管闭塞血管内治疗后90 d预后的危险因素。方法回顾性分析2019年3月—2023年6月江苏大学附属宜兴医院神经外科收治的64例患者资料,均为急性后循环大血管闭塞并行血管内治疗的病例。根据患者术后90 d改良Rankin量表... 详细信息

目的探讨急性后循环大血管闭塞血管内治疗后90 d预后的危险因素。方法回顾性分析2019年3月—2023年6月江苏大学附属宜兴医院神经外科收治的64例患者资料,均为急性后循环大血管闭塞并行血管内治疗的病例。根据患者术后90 d改良Rankin量表(modified rankin score,mRS)评分,mRS评分≤2分者为预后良好组,mRS评分≥3分者为预后不良组,将基线资料、临床资料及随访资料行组间比较。先行单因素分析筛选出危险因素,再行多因素logistic回归分析。结果共入组64例患者,其中预后良好组25例,预后不良组39例,单因素分析结果显示,2组间术前美国国立卫生研究院卒中量表(National Institutes of Health stroke scale,NIHSS)评分及基底动脉闭塞血管造影侧支分级(angiographic collateral grading system for basilar artery occlusion,ACGS-BAO)比较,差异有统计学意义(P<0.05)。多因素logistic回归分析结果显示,术前NIHSS评分≥20分及ACGS-BAO分级≤2级与不良预后相关,2组比较差异有统计学意义(P<0.05)。结论急性后循环大血管闭塞血管内治疗术后90 d不良预后与术前高NIHSS评分,低ACGS-BAO分级相关。

关键词：急性后循环大血管闭塞血管内治疗预后