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Harmonic mode-locked fiber laser based on microfiber-assisted nonlinear multimode interference

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Chinese Optics Letters 2022年第1期20卷 12-16页

作者： Renyan Wang Liang Jin Jiazhu Wang shangzhi xie Xiaohui Li Yingtian Xu He Zhang Xin Zhao Xiaohui Ma National Key Laboratory of High-power Semiconductor Lasers Changchun University of Science and TechnologyChangchun 130022China

A novel harmonic mode-locked fiber laser based on nonlinear multimode interference(NL-MMI) in a microfiber-assisted ultrafast optical switch is proposed in this *** microfiber-assisted ultrafast optical switch can be obtained by tapering the splicing point of the graded-index multimode fiber(GIMF) and single-mode fiber,which not only helps to shorten the self-imaging period in GIMF to relax the strict requirement of NL-MMI on the length of multimode fiber,but also improves the harmonic *** the experiment,with the waist diameter of ~15 μm,the repetition rates of the fiber laser can be stably locked at 285 MHz,corresponding to the 16 th-order harmonic mode-locking,with the pulse duration of 1.52 *** results provide novel insight into the design of a high-repetition-rate laser and the application of microfibers in the modelocking device.

关键词： multimode interference optical fiber devices laser mode-locking

滑坡堆积体变形失稳机制--以贵州剑河县东岭信滑坡为例

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吉林大学学报（地球科学版） 2022年第2期52卷 503-516页

作者：唐军峰唐雪梅周基钟辉亚谢尚智湖南科技学院土木与环境工程学院湖南永州425199 中国电建中南勘测设计研究院有限公司长沙410014 湖南华安基础工程有限公司长沙410000

为了对滑坡堆积体的变形机制进行研究,更有效地开展滑坡治理工作,以贵州剑河县东岭信滑坡堆积体为例,根据现场地质勘查、室内试验和排水隧洞施工揭露情况,探明了东岭信滑坡堆积体的地质条件;基于丰富的监测数据,综合分析了地表位移、地... 详细信息

为了对滑坡堆积体的变形机制进行研究,更有效地开展滑坡治理工作,以贵州剑河县东岭信滑坡堆积体为例,根据现场地质勘查、室内试验和排水隧洞施工揭露情况,探明了东岭信滑坡堆积体的地质条件;基于丰富的监测数据,综合分析了地表位移、地表裂缝、洞内裂缝和深部位移,探讨了滑坡堆积体的变形特征;采用数值方法,分析和评价了堆积体的边坡稳定性.研究结果表明:水库初期蓄水开启了东岭信滑坡堆积体的变形失稳进程,边坡进入蠕滑变形阶段;河水位上升与持续强降雨导致边坡地下水位抬升,激发边坡变形曲线呈阶跃式发展;边坡安全系数在汛前枯水期达到最高(1.14),在汛期末处于最低值(1.01).治理工作重点在于做好边坡的截排水措施,降低地下水位.

关键词：滑坡堆积体地下水位变形机制滑坡稳定性

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钌基催化剂配位环境对聚乙烯氢解性能的影响

化工学报 2024年第10期75卷 3588-3599页

作者：颜诗宇高姣姣杨太顺谢尚志杨艳娟徐晶广西大学化学化工学院广西石化资源加工与过程强化技术重点实验室广西南宁530004 华东理工大学化工学院绿色化工与工业催化全国重点实验室上海200237

聚乙烯氢解可以产生多种碳氢化合物,产品分布非常宽,产物选择性调控具有一定挑战性。通过调控钌负载量制备了不同钌粒径的Ru/CeO_(2)催化剂,利用TEM、insitu DRIFTS和模型计算等多种技术,发现聚乙烯催化氢解的产物分布与钌金属配位环境... 详细信息

聚乙烯氢解可以产生多种碳氢化合物,产品分布非常宽,产物选择性调控具有一定挑战性。通过调控钌负载量制备了不同钌粒径的Ru/CeO_(2)催化剂,利用TEM、insitu DRIFTS和模型计算等多种技术,发现聚乙烯催化氢解的产物分布与钌金属配位环境密切相关。表征和模型计算表明,不同尺寸的钌纳米颗粒具有不同的几何结构和配位环境。钌平均粒径为0.85 nm时,低配位的边/角位点占主导,其C_(2)~C_(40)选择性达到92%。钌平均粒径达到2.75 nm时,高配位的平台位点占主导,C_(2)~C_(40)选择性仅为8%,甲烷选择性高达92%。结合截断六角双锥模型和CO-DRIFTS实验,推断Ru/CeO_(2)催化剂上产物的选择性可能与聚乙烯氢解中间体和钌纳米颗粒表面的相互作用有关,提出了Ru/CeO_(2)催化剂上聚乙烯氢解两种反应路径与配位环境的关系。

关键词：废塑料降解催化剂加氢碳氢化合物钌纳米颗粒

基于抗氯盐型灌浆料的承插式预制桥墩的抗震性能研究

同方期刊数据库博看期刊评论

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黑龙江科学 2023年第14期14卷 64-67,71页

作者：宋林林赵连地谢尚志薛振山东交通学院济南250300 济南城建集团有限公司济南250031

为了满足高氯盐环境下承插式预制桥墩的耐久性需求,在灌浆连接部位采用抗氯盐型灌浆料,以改善桥墩根部的防腐性能,并对其抗震性能进行研究。参考实际工程结构,基于有限元软件ABAQUS建立了采用抗氯盐型灌浆料的承插式钢筋混凝土桥墩动力... 详细信息

为了满足高氯盐环境下承插式预制桥墩的耐久性需求,在灌浆连接部位采用抗氯盐型灌浆料,以改善桥墩根部的防腐性能,并对其抗震性能进行研究。参考实际工程结构,基于有限元软件ABAQUS建立了采用抗氯盐型灌浆料的承插式钢筋混凝土桥墩动力分析模型,对低周往复荷载下的破坏模式、滞回曲线及耗能等进行研究。结果表明,承插式桥墩受震破坏为预制构件连接处混凝土破坏,灌浆料局部发生轻微损坏,但并不会影响结构整体抗震性能。滞回曲线呈饱满的“梭形”,表明结构耗能稳定,该承插式桥墩抗震性能较好。

关键词：承插式桥墩灌浆料数值模拟结构抗震高氯盐

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现代化综合性医院建设的前期思考——以温州市中西医结合医院滨江院区概念设计为例

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中国医院建筑与装备 2021年第3期22卷 50-53页

作者：于悦谢尚志展利军严书婷温州市中西医结合医院总务科温州325000 北京市大兴区观音寺街道城市管理办公室北京102600

针对温州市中西医结合医院滨江院区新建项目,详细分析了其初步概念设计方案中存在的问题并给出相应的优化措施,同时结合现代化综合性医院建设的要求给出相关的设计建议。

关键词：温州市中西医结合医院滨江院区初步概念设计综合性医院

Predictive models for characterizing the atomization process in pyrolysis of methyl ricinoleate

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Chinese Journal of Chemical Engineering 2020年第4期28卷 1023-1028页

作者： Xiaoning Mao Qinglong xie Ying Duan shangzhi Yu Xiaojiang Liang Zhenyu Wu Meizhen Lu Yong Nie Biodiesel Laboratory of China Petroleum and Chemical Industry Federation Zhejiang Provincial Key Laboratory of Biofueland College of Chemical EngineeringZhejiang University of TechnologyHangzhou 310014China

Pyrolysis of methyl ricinoleate(MR)can produce undecylenic acid methyl ester and heptanal which are important *** feeding favors the heat exchange in the pyrolysis process and hence increases the product ***,predictive models to characterize the atomization process were *** effect of spray distance on Sauter mean diameter(SMD)of atomized MR droplets was examined,with the optimal spray distance to be 40-50 *** mainly affected the physical properties of feedstock,with smaller droplet size obtained at increasing *** addition,pressure had significant influence on SMD and higher pressure resulted in smaller atomized ***,a model for SMD prediction,combining temperature,pressure,spray distance,and structural parameters of nozzle,was developed through dimensionless *** results showed that SMD was a power function of Reynolds number(Re),Ohnesorge number(Oh),and the ratio of spray distance to diameter of swirl chamber in the nozzle(H/dsc),with the exponents of-1.6618,-1.3205 and 0.1038,*** experimental measured SMD was in good agreement with the calculated values,with the error within±15%.Moreover,the droplet size distribution was studied by establishing the relationship between the standard deviation of droplet size and *** study could provide reference to the regulation and optimization of the atomization process in MR pyrolysis.

关键词： Atomization Methyl ricinoleate pyrolysis Predictive model Sauter mean diameter(SMD) Spray distance

Toplayer-dependent crystallographic orientation imaging in the bilayer two-dimensional materials with transverse shear microscopy

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Frontiers of physics 2021年第5期16卷 165-172页

作者： Sabir Hussain Rui Xu Kunqi Xu Le Lei Shuya Xing Jianfeng Guo Haoyu Dong Adeel Liaqat Rashid Iqbal Muhammad Ahsan Iqbal shangzhi Gu Feiyue Cao Yan Jun Li Yasuhiro Sugawara Fei Pang Wei Ji Liming xie Shanshan Chen Zhihai Cheng Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-nano Devices Department of PhysicsRenmin University of ChinaBeijing100872China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing100190China Key Laboratory of Inorganic Functional Materials and Devices Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China University of Chinese Academy of Sciences Beijing100039China Department of Applied Physics Graduate School of EngineeringOsaka University2-1 YamadaokaSuitaOsaka565-0871Japan

Nanocontact properties of two-dimensional(2D)materials are closely dependent on their unique nanomechanical systems,such as the number of atomic layers and the supporting ***,we report a direct observation of toplayer-dependent crystallographic orientation imaging of 2D materials with the transverse shear microscopy(TSM).Three typical nanomechanical systems,MoS_(2) on the amorphous SiO_(2)/Si,graphene on the amorphous SiO_(2)/Si,and MoS_(2) on the crystallized Al_(2)O_(3),have been investigated in *** experimental observation reveals that puckering behaviour mainly occurs on the top layer of 2D materials,which is attributed to its direct contact adhesion with the AFM ***,the result of crystallographic orientation imaging of MoS_(2)/SiO_(2)/Si and MoS_(2)/Al_(2)O_(3) indicated that the underlying crystalline substrates almost do not contribute to the puckering effect of 2D *** work directly revealed the top layer dependent puckering properties of 2D material,and demonstrate the general applications of TSM in the bilayer 2D systems.

关键词： 2D materials toplayer-dependent crystallographic orientation imaging nanomechanical contact properties transverse shear microscopy

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数学创造力的特征、培养与研究展望

全球教育展望 2020年第5期49卷 119-128页

作者：谢明初王尚志华南师范大学数学科学学院广州510631 首都师范大学数学科学学院北京100048 普通高中数学课程标准修订组

创造力是推动数学发展的源动力。中小学生创造力培养正成为评价数学教育水平的重要指标之一。中国基础数学教育取得了国际公认的成绩,但如何提高学生的数学创造力却面临挑战。本文通过比较数学创造过程与数学学习过程,分析学生数学创造... 详细信息

创造力是推动数学发展的源动力。中小学生创造力培养正成为评价数学教育水平的重要指标之一。中国基础数学教育取得了国际公认的成绩,但如何提高学生的数学创造力却面临挑战。本文通过比较数学创造过程与数学学习过程,分析学生数学创造力的特征;以数学教育价值观、数学教育目标,数学学习环境为切入点,探讨如何在课堂教学中培养学生的数学创造力,并提出数学创造力进一步研究有价值的课题。

关键词：数学教育创造力特征培养

CLONING AND CHARACTERIZATION OF A METAL RESPONSIVE ELEMENT-CONTAINING FRAGMENTF ROM THE WILSON DISEASE GENE LOCUS BY JUNCTION TRAPPING

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Chinese Medical Sciences Journal 1998年第1期13卷 9-13页

作者：谢久永刘国抑王梅黄尚志罗会元 Department of Medical Genetics Institute of Basic Medical Sciences CAMS & PUMC Beijing 100005

All mammalian metallothionein genes studied to date have several metal responsive elements (MRE) with consensus sequences of TGCRCNC (R, purine) in their regulatory region. MRE-like sequences were also found in many other metal-related genes. To see whether there is also such a sequence at the genetic locus (13q14. 3) of Wilson disease, which is a genetic disorder of copper metabolism, junction-trapping method based on the MRE sequence was used. A fragment containing MRE and MRE-like sequences from YAC 27D8 at the WND locus was successfully cloned and mapped back to the YAC by PCR. Presence of such a sequence in the copper transporter gene at the WD locus might imply that it has a possible interesting role in the regulation of WD gene expression.

关键词： metal responsive element (MRE) Wilson disease junction-trapping