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Performance of an electron linear accelerator for the first photoneutron source in China

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Nuclear Science and Techniques 2019年第4期30卷 1-7页

作者： Xuan Li Jun-qiang Zhang Guo-qiang lin Wen-Cheng Fang qiang Gu Meng Zhang Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai Synchrotron Radiation Facility Chinese Academy of Sciences University of Chinese Academy of Sciences

A compact 15.0-MeV, 1.5-kW electron linear accelerator(linAC) was successfully constructed to provide an electron beam for the first photoneutron source at the Shanghai Institute of Applied Physics, Shanghai,China. This linAC consists of five main parts: a thermal cathode grid-controlled electron gun, a pre-buncher, a variable-phase-velocity buncher, a light-speed accelerating structure, and a high-power transportation beamline. A digital feedforward radio frequency compensator is adopted to reduce the energy spread caused by the transient beam loading effect. Furthermore, a real-time electron gun emission feedback algorithm is used to keep the beam stable. After months of efforts, all the beam parameters successfully met the requirements of the facility. In this paper, the beam commissioning process and performance of the linAC are presented.

关键词： Electron linear accelerator High-power transportation beamline Digital feedforward radio frequency compensation Real-time electron gun emission feedback algorithm Transmission efficiency

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用于可移动量子重力仪的光纤拉曼激光源研究

光子学报 2024年第8期53卷 148-159页

作者：高浚超陈俊杰叶留贤程冰吴彬王河林王肖隆林强浙江工业大学理学院浙江省量子精密测量重点实验室杭州310023

基于两个窄线宽光纤激光器和自制的锁相控制系统,研制了一个低相位噪声窄线宽拉曼光纤激光源,建立了拉曼光纤激光系统的相位噪声模型,研究了拍频光功率、不同频率参考源对拉曼激光相位噪声的影响。实验结果表明,该拉曼光纤激光源在10 Hz... 详细信息

基于两个窄线宽光纤激光器和自制的锁相控制系统,研制了一个低相位噪声窄线宽拉曼光纤激光源,建立了拉曼光纤激光系统的相位噪声模型,研究了拍频光功率、不同频率参考源对拉曼激光相位噪声的影响。实验结果表明,该拉曼光纤激光源在10 Hz~1 MHz范围内相位噪声功率谱密度可达到^(-11)8 dBc/√Hz,相应的相位噪声为22.7 mrad,将其应用到重力仪中获得的重力测量灵敏度为10.93μGal/√Hz。对拉曼激光源进行连续3 h的相位噪声稳定性测试和连续25 min的频率稳定性测试,得到的相位噪声标准差为0.734 mrad,相应的重力灵敏度标准差仅为0.349μGal/√Hz。当积分时间为1 s时,相位锁定时频率稳定度为2.675×10^(-11),验证了该激光源具有低相位噪声和高稳定性。利用相位噪声模型得到的理论结果与实验结果一致,证实了理论模型的正确性。

关键词：冷原子拉曼激光光纤锁相干涉仪相位噪声窄线宽

Chemistry and biology of Pestalotiopsis-derived natural products

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Fungal Diversity 2014年第3期66卷 37-68页

作者： Jing Xu Xiaobo Yang qiang lin Key Laboratory of Protection and Development Utilization of Tropical Crop Germplasm Resources Ministry of EducationCollege of Material and Chemical EngineeringHainan UniversityHaikou 570228People’s Republic of China Institute of Functional Biomolecules State Key Laboratory of Pharmaceutical BiotechnologyNanjing UniversityNanjing 210093People’s Republic of China Key laboratory of water pollution treatment&resource reuse of Hainan province Hainan Normal UniversityHaikou 571158People’s Republic of China

Species within the fungal genus Pestalotiopsis have become a topic of research in many microbial-chemical and pharmacological laboratories because they contain structurally complex,biologically active *** article is a follow-up to a previous review(Xu,Ebada,and Proksch,Fungal Divers 44:15–31,2010).It focuses particularly on new findings concerning the chemistry and bioactivity of Pestalotiopsis sp.,covering a period ranging from August 2010 to August *** 160 metabolites were isolated from Pestalotiopsis species during this period and their structures are reported within a biogenetic *** showed antitumor,antifungal,and antimicrobial activities to be the most notable bioactivities of secondary metabolites isolated from this *** biogenetic pathways associated with the alkaloids,sesquiterpenes,quinines,xanthones,and lactones covered in this review are highlighted.

关键词： Secondary metabolites Bioactivity Biogenetic relationships

Raman spectroscopy as process analytical tool in downstream processing of biotechnology

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Chinese Journal of Chemical Engineering 2021年第2期34卷 204-211页

作者： Yu Kiat lin Hui Yi Leong Tau Chuan ling Dong-qiang lin Shan-Jing Yao Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Institute of Biological Sciences Faculty of ScienceUniversity of MalayaKuala Lumpur 50603Malaysia

Downstream processing or product recovery plays a vital role in the development of *** improve the bioprocess efficiency,some unconventional methods are much *** continuous manufacturing in downstream processing makes the Process Analytical Technologies(PATs)as an important *** and controlling bioprocess are an essential factor for the principles of PAT and quality by *** methods can apply to monitor multiple analytes in real-time with less sample processing with significant *** spectroscopy is an extensively used technique as an analytical and research tool owing to its modest process form,non-destructive,non-invasive optical molecular spectroscopic imaging with computer-based ***,its application is essential for the analysis and characterization of biological samples,and it is easy to operate with minimal *** innovation on various types of enhanced Raman spectroscopy was designed to enhance the Raman analytical *** spectroscopy could couple with chemometrics to provide reliable alternative analysis method of downstream process ***,this review aims to provide useful insight on the application of Raman spectroscopy for PAT in downstream processing of biotechnology and Raman data analysis in biological fields.

关键词： Raman spectroscopy Process analytical technology Downstream bioprocessing Biotechnology

Effect of rare earth and alloying elements on the thermal conductivity of austenitic medium manganese steel

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International Journal of Minerals,Metallurgy and Materials 2017年第6期24卷 670-674页

作者： Shao-chun Chen Hong-xiang Ye Xin-qiang lin School of Mechanical Engineering and Automation Fuzhou University Fuzhou 350116 China

The influence of different contents of Cr, Mo, and rare earth element(RE) additives on the thermal conductivity of austenitic medium manganese steel was studied and discussed. The results show that the addition of Cr in medium manganese steel can improved the ordering of C–Mn atomic clusters, so as to improve the steel's thermal conductivity. However, Cr will lead to precipitation of a great deal of carbides in medium manganese steel when its content is greater than 4wt%. These carbides would aggregate around the grain boundary, and as a result, the thermal conductivity is decreased. By the addition of Mo whose content is about 2wt%, spherical carbides will be formed, thus improving the thermal conductivity of the medium manganese steel. The interaction between rare earth elements and alloying elements will raise both the thermal conductivity and the wear-resisting property of medium manganese steel.

关键词： medium manganese steel alloying elements rare earth thermal conductivity

盐度对电化学预处理污泥-餐厨垃圾共发酵的影响

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中国给水排水 2024年第17期40卷 23-30页

作者：白华清曾正仁魏业香林强习诗浩王宗平雷琳慧中国市政工程西南设计研究总院有限公司四川成都610081 华中科技大学环境科学与工程学院湖北武汉430074

餐厨垃圾中的盐分在电化学预处理(EPT)作用下会被转化为活性氯化物(RCS),其能够有效促进剩余污泥-餐厨垃圾厌氧共发酵产挥发性脂肪酸(VFAs),但残留量过高会抑制厌氧发酵菌的活性。为此,研究了不同盐度(3、6、10 g/L,以NaCl计)对剩余污泥... 详细信息

餐厨垃圾中的盐分在电化学预处理(EPT)作用下会被转化为活性氯化物(RCS),其能够有效促进剩余污泥-餐厨垃圾厌氧共发酵产挥发性脂肪酸(VFAs),但残留量过高会抑制厌氧发酵菌的活性。为此,研究了不同盐度(3、6、10 g/L,以NaCl计)对剩余污泥-餐厨垃圾电化学预处理后有机质溶出情况及厌氧共发酵产酸效能的影响,并通过测定关键酶活性和微生物高通量测序分析其作用机理。结果表明,电化学预处理可有效提高较低盐度(3 g/L)混合基质中有机质的溶出效能,抑制产甲烷菌,促进水解酸化细菌(如Prevotella_7)的富集,强化后续厌氧共发酵产酸效能。混合基质的最佳盐度为3 g/L,经电化学预处理后厌氧共发酵的VFAs产量最高达到2259.33 mg/L,相比未电化学预处理组提升了33.27%。

关键词：剩余污泥餐厨垃圾厌氧共发酵电化学预处理盐度挥发性脂肪酸

海丝情怀:陶瓷技术创新对德化陶瓷文化对外传播

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陶瓷 2024年第4期 130-132,176页

作者：陈琰赖盈彤林强林桂池陈智捷陈琳莆田学院福建莆田351100

笔者以海丝背景下陶瓷技术创新为研究对象,探讨其在陶瓷文化传播中的重要影响。随着“海上丝绸之路”(海丝)战略的推进,陶瓷作为中国传统文化的重要组成部分,其传播与交流也得到了前所未有的发展机遇。在这个背景下,陶瓷技术创新的出现... 详细信息

笔者以海丝背景下陶瓷技术创新为研究对象,探讨其在陶瓷文化传播中的重要影响。随着“海上丝绸之路”(海丝)战略的推进,陶瓷作为中国传统文化的重要组成部分,其传播与交流也得到了前所未有的发展机遇。在这个背景下,陶瓷技术创新的出现为陶瓷文化的传播带来了新的动力。通过对陶瓷技术创新的介绍及其特点的展示,分析其在陶瓷文化传播中的优势,以及从多个方面阐述陶瓷技术创新如何推动陶瓷文化的交流与传播,并提出相应的对策建议。

关键词：陶瓷陶瓷技术创新陶瓷文化传播一带一路德化陶瓷

双(2-柠康酰亚胺苯基)二硫化物对天然橡胶性能的影响

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橡胶工业 2024年第1期71卷 3-10页

作者：何铭彬邹立经陈朝晖黄学智吴再生林强华南理工大学材料科学与工程学院广东广州510641 江苏锐巴新材料科技有限公司江苏连云港222200

采用双(2-柠康酰亚胺苯基)二硫化物(BCoPD)作为天然橡胶(NR)的多功能硫化助剂,通过机械共混制备BCoPD/NR复合材料,探讨BCoPD用量和复合材料制备方法对BCoPD/NR复合材料的门尼粘度、Payne效应、硫化特性、交联键分布、物理性能和动态力... 详细信息

采用双(2-柠康酰亚胺苯基)二硫化物(BCoPD)作为天然橡胶(NR)的多功能硫化助剂,通过机械共混制备BCoPD/NR复合材料,探讨BCoPD用量和复合材料制备方法对BCoPD/NR复合材料的门尼粘度、Payne效应、硫化特性、交联键分布、物理性能和动态力学性能的影响。结果表明:采用在生胶塑解过程中加入BCoPD的BCoPD/NR复合材料制备方法,加入0.5份BCoPD使得复合材料的门尼粘度下降22.2%,60 min时的抗硫化返原率减小3%,多硫键比例增大3%,物理性能小幅下降,抗湿滑性能小幅提高;采用在加硫化体系时加入BCoPD的BCoPD/NR复合材料制备方法,加入1份BCoPD使得复合材料60 min时的抗硫化返原率下降11.9%,多硫键比例增大4%,物理性能有所提高,滚动阻力小幅下降。

关键词：天然橡胶双(2-柠康酰亚胺苯基)二硫化物塑解多硫键抗硫化返原性能

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单轴压缩下不同饱和度红砂岩横波特征研究

有色金属科学与工程 2024年第1期15卷 105-114页

作者：程锦山管华栋王观石汪永超林强江西理工大学江西省环境岩土与工程灾害控制重点实验室江西赣州341000 江西理工大学土木与测绘工程学院江西赣州341000

为了研究饱和度对岩石超声波横波传播规律影响,以红砂岩为研究对象,开展不同饱和度下入射频率分别为50、100、200 kHz的超声波横波传播实验,分析饱和度及入射频率对横波声学参数变化规律。结果表明:干燥至饱和状态,横波波速随饱和度增... 详细信息

为了研究饱和度对岩石超声波横波传播规律影响,以红砂岩为研究对象,开展不同饱和度下入射频率分别为50、100、200 kHz的超声波横波传播实验,分析饱和度及入射频率对横波声学参数变化规律。结果表明:干燥至饱和状态,横波波速随饱和度增大呈非线性下降趋势,幅值衰减系数随饱和度增大呈非线性递增趋势,均满足三次函数关系,属于高度相关;整体分析发现横波波速受饱和度变化影响大于幅值衰减系数,幅值衰减系数拟合参数能较好反映岩样物理量的变化;基于敏感性及决定系数的综合考虑,建议今后采用100 kHz作为含水砂岩超声波横波测试优势频率。研究成果可为不同饱和度下岩石超声波测试技术发展提供参考。

关键词：饱和度超声波横波横波波速幅值衰减系数入射频率