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On-chip integrated few-mode erbium–ytterbium co-doped waveguide amplifiers

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Photonics Research 2024年第5期12卷 1067-1077页

作者： XIWEN HE DEYUE MA CHEN zhou MINGYUE XIAO WEIBIAO CHEN zhiping zhou Aerospace Laser Technology and Systems Department Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China School of Physical Sciences University of Science and Technology of ChinaHefei 230026China School of Microelectronics Shanghai UniversityShanghai 201800China State Key Laboratory of Advanced Optical Communications Systems and Networks School of ElectronicsPeking UniversityBeijing 100871China

We propose for the first time,to the best of our knowledge,an on-chip integrated few-mode erbium–ytterbium co-doped waveguide amplifier based on an 800 nm thick Si_(3)N_(4)platform,which demonstrates high amplification gains and low differential modal gains(DMGs)*** eccentric waveguide structure and a co-propagating pumping scheme are adopted to balance the gain of each mode.A hybrid mode/polarization/wavelengthdivision(de)multiplexer with low insertion loss and crosstalk is used for multiplexing and demultiplexing in two operation wavebands centered at 1550 nm and 980 nm,where the light in these two bands serves as the signal light and pump light of the amplifier,*** results demonstrate that with an input signal power of 0.1 mW,TE_(0)mode pump power of 300 mW,and TE_(1)mode pump power of 500 m W,the three signal modes(TE_(0)∕TM_(0)∕TE_(1))all exhibit amplification gains exceeding 30 dB,while maintaining a DMG of less than 0.1 dB.

关键词： waveguide pump amplifier

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

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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

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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广东广州510650

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... 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As^(5+)还原为As^(0)(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As^(0),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

中华优秀传统文化融入高职院校思政课“互联网+”传播矩阵的构建

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广东交通职业技术学院学报 2024年第4期23卷 125-128页

作者：吴颖周志平广东交通职业技术学院广东广州510650

在“互联网+”普及的时代背景下,多元文化对中华优秀传统文化形成诸多挑战。通过“互联网+”教学模式的探索,高职院校思政课教学方式仍有提升空间,同时伴随“互联网+”技术迭代飞速,颠覆了中华优秀传统文化的常规传播模式。因此,应充分... 详细信息

在“互联网+”普及的时代背景下,多元文化对中华优秀传统文化形成诸多挑战。通过“互联网+”教学模式的探索,高职院校思政课教学方式仍有提升空间,同时伴随“互联网+”技术迭代飞速,颠覆了中华优秀传统文化的常规传播模式。因此,应充分利用现代化技术,以网络平台触达,打造“互联网+”数字化育人的协同平台,以思政课涵养,丰富“互联网+”教学内容的传导模式,以院校机制引领,发挥“互联网+”微传播的带动作用,引导高职院校青年学生解读中华优秀传统文化的卓越成就与时代价值,助力高职院校青年学生坚定个人信仰与政治方向,更好地成为能肩负起为实现中华民族伟大复兴大任的时代新人。

关键词：高职教育传统文化互联网+ 思政课

Photonics Research emerges as a top choice for publication in photonics:editorial

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Photonics Research 2018年第12期6卷 I0001-I0002页

作者： zhiping(JAMES)zhou Photonics Research Peking University

Time really flies! It has been six years since I assumed the founding Editor-in-Chief position for the new journal,Photonics Research, in August 2012, then approved seven founding Associate Editors, opened its submission site in December 2012, and published its first issue in June *** Photonics Research is much more mature, so it is also time for me and the group of founding Associate Editors to pass on the editorial responsibility to a new team.

关键词： photonics published editing

桂北地区建筑底层架空对夏季校园微气候的影响

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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

On-chip light sources for silicon photonics

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Light(Science & Applications) 2015年第1期4卷 79-91页

作者： zhiping zhou Bing Yin Jurgen Michel State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer SciencePeking UniversityBeijing 100871China Department of Materials Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA

Serving as the electrical to optical converter,the on-chip silicon light source is an indispensable component of silicon photonic technologies and has long been ***,we briefly review the history and recent progress of a few promising contenders for on-chip light sources in terms of operating wavelength,pump condition,power consumption,and fabrication ***,the performance of each contender is also assessed with respect to thermal stability,which is a crucial parameter to consider in complex optoelectronic integrated circuits(OEICs)and optical ***,III-V-based silicon(Si)lasers formed via bonding techniques demonstrate the best performance and display the best opportunity for commercial usage in the near ***,in the long term,direct hetero-epitaxial growth of III–V materials on Si seems more promising for low-cost,high-yield *** demonstration of high-performance quantum dot(QD)lasers monolithically grown on Si strongly forecasts its feasibility and enormous potential for on-chip *** superior temperature-insensitive characteristics of the QD laser promote this design in large-scale high-density *** Germanium(Ge)-on-Si laser is also competitive for large-scale monolithic integration in the *** with a III-V-based Si laser,the biggest potential advantage of a Ge-on-Si laser lies in its material and processing compatibility with Si ***,the versatility of Ge facilitates photon emission,modulation,and detection simultaneously with a simple process complexity and low cost.

关键词： on-chip light sources optical interconnections optoelectronic integrated circuit silicon photonics

Kinetic analysis of self-condensing vinyl polymerization with unequal reactivities

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Chinese Science Bulletin 2008年第22期53卷 3516-3521页

作者： zhou zhiping WANG GaiJuan YAN DeYue School of Materials Science and Engineering Jiangsu University Zhenjiang 212013 China State Key Laboratory of Metal Matrix Composites Shanghai Jiaotong University Shanghai 200240 China

The distribution function of the hyperbranched polymers formed from the self-condensing vinyl polymerization with unequal reactivities was derived and the differential equations for the second moments are established, based on the variable of the conversion of B* groups. The various average degrees of branching can be designed by suitable values of reactivities ratio (r) and the conversion of A group (x). In order to reach the maximum degree of branching at a specified x, r needed is dependant on the value of x. The higher the x, the less the r needed is for the maximum value of degree of branching. At the end of the reaction, the maximum degree of branching reaches 0.5 with r=2.59.

关键词：聚合物聚合作用 SCVP 分布功能

Spontaneous emission rate and optical amplification of Er3+ in double slot waveguide

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Science China(Physics,Mechanics & Astronomy) 2015年第12期58卷 166-172页

作者： WANG XingJun JIANG LingJun GUO RuiMin YE Rui zhou zhiping State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer SciencePeking University Division of Biological Energy and Environmental Measurement National Institute of Metrology

The spontaneous emission(SE) of Er3+ embedded in a double slot dielectric structure was studied by a quantum-electrodynamical formalism. The study shows that the slot width and the position of Er3+ in slot structure have a significant effect on the SE. The double slot waveguides were fabricated by embedding two low-index Er/Yb silicate material layers into high-index silicon. The radiative efficiency of Er3+ in the double slot waveguides is found to be higher than that of the single slot waveguide, which is consistent with the theory simulation. The 0.67 d B signal enhancement at 1.53 ?m in a 4.6-mm-long slot waveguide was observed pumped by 1476 nm laser. These results show the relevance of our model to study the SE processes in multilayer structures and are important for future realization of silicon-compatible active optical devices.

关键词： slot waveguide spontaneous emission rate quantum efficiency