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Stress and optical constants in thin films of BaF₂-PrF₃: A potential Th-free infrared low-index evaporation material

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OPTIK 2018年 173卷 174-179页

作者： Lva, xuwen Zheng, Weimin Xie, Ping Li, Bin He, Weixiang Jing, Chao liu, Dingquan Shanghai Univ Dept Phys Shanghai 200444 Peoples R China Shandong Univ Sch Space Sci & Phys Weihai 264209 Peoples R China Chinese Acad Sci Shanghai Inst Tech Phys Shanghai 200083 Peoples R China Shanghai Tech Univ Sch Phys Sci & Technol Shanghai 200031 Peoples R China

Although PrF3 can be regarded as a potential infrared low-index evaporation material used in infrared antireflection to substitute for radioactive ThF4 because its thin films have a good transparency, the lower refractive index n and extinction coefficient k in the spectral range of thermal infrared, the greater tensile stress emerging in its layers will deteriorate the reliability and durability of antireflection coatings. In our investigation, BaF2-PrF3 thin films were deposited using electron beam evaporation from the sintered pellets of PrF3 admixed with BaF2. Stress in thin films was calculated from Stoney's equation on the basis of measuring the changes of radius of curvature of thin silicon strips. The stoichiometry of thin films was determined using the energy dispersive X-ray analysis (EDX). The optical constants of thin films were determined by fitting the measured spectral transmittance curves using Lorentz oscillators as a dispersion model. It can be observed that stress in BaF2-PrF3 thin films is obviously reduced with the increasing of the concentration of BaF2 in thin films and the sintered pellets. Moreover, it was also demonstrated that incorporation of BaF2 into PrF3 can reduce the refractive index of thin films, although BaF2-PrF3 thin films have a greater dispersion than that of PrF3 thin films. In addition, the lower value of extinction coefficient is also presented in thin films, like those of rare-earth fluorides.

关键词： Antireflection coatings Infrared Praseodymium fluoride Barium fluoride Electron beam evaporation Stress Optical constant

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Thallium isotopic fractionation in industrial process of pyrite smelting and environmental implications

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JOURNAL OF HAZARDOUS MATERIALS 2020年 384卷 121378页

作者： liu, Juan Yin, Meiling Xiao, Tangfu Zhang, Chaosheng Tsang, Daniel C. W. Bao, Zhi'an Zhou, Yuting Chen, Yongheng Luo, xuwen Yuan, Wenhuan Wang, Jin Guangzhou Univ Sch Environm Sci & Engn Inst Environm Res Greater BayMinist Educ Key Lab Water Qual & Conservat Pearl River Delta Guangzhou 510006 Guangdong Peoples R China Hong Kong Polytech Univ Dept Civil & Environm Engn Hung Hom Kowloon Hong Kong Peoples R China Natl Univ Ireland Sch Geog & Archaeol & Ryan Inst Int Network Environm & Hlth Galway Ireland Northwest Univ Dept Geol State Key Lab Continental Dynam Xian 710069 Shaanxi Peoples R China

Thallium (Tl) is typical rare element with severe toxicity comparable to Hg and Pb. To track Tl pollution, isotopic fractionation of Tl was evaluated during pyrite smelting for sulfuric acid production. Large variations in Tl isotope compositions were observed among the pyrite ore (PO) and its four different smelting wastes. The starting raw PO had an epsilon Tl-205 value of + 1.28. The fluidized-bed furnace slag generated by high-temperature smelting had the heaviest epsilon Tl-205 (+ 16.24) in the system. Meanwhile, the boiler fly ash (epsilon Tl-205 = +8.34), cyclone fly ash (epsilon Tl-205 = + 2.17), and electrostatic precipitation fly ash (epsilon Tl-205 = -1.10), with decreasing grain sizes during the treatment processes, were characterized by elevated levels of Tl contents and substantial enrichment in the light Tl isotopes relative to the furnace slag. Further calculation and high-resolution transmission electron microscopy indicated that Tl isotope fractionation could be governed by both Rayleigh-type fractionation and adsorption of volatilized Tl by particles of various grain sizes. According to the substantial differences in the PO from its smelting wastes and the measurement precision of isotopic fractionation, it is suggested that Tl isotopes can serve as a new tool for tracing pollution of Tl.

关键词： Potentially toxic elements Fly ash Source apportionment Isotopic signature Pyrite smelting

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High Q and high gradient performance of the first medium-temperature baking 1.3 GHz cryomodule

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Physical Review Accelerators and Beams 2024年第9期27卷 092003页

作者： Weimin Pan Jiyuan Zhai Feisi He Rui Ge Zhenghui Mi Peng Sha Song Jin Ruixiong Han Qunyao Wang Haiying Lin Guangwei Wang xuwen Dai Zhanjun Zhang Mei Li Minjing Sang Liangrui Sun Rui Ye Tongxian Zhao Shaopeng Li Keyu Zhu Baiqi liu Xiaolong Wang Xiangchen Yang Xiaojuan Bian Xiangzhen Zhang Huizhou Ma Jianbing Zhao Liang Zhang Hui Zhao Runbing Guo Zhihui Mu Conglai Yang Xiaobing Zheng Chao Dong Hongjuan Zheng Zhengze Chang Xiaochen Yang Tongming Huang Qiang Ma Zihan Wang Ming liu Wenzhong Zhou Senyu Chen Chinese Academy of Sciences Beijing 100049 China Beijing 100049 China

The world’s first 1.3 GHz cryomodule containing eight 9-cell superconducting radio-frequency (rf) cavities treated by medium-temperature furnace baking (mid-T bake) was developed at the Institute of High Energy Physics, Chinese Academy of Sciences. The 9-cell cavities in the cryomodule achieved an unprecedented high average intrinsic quality factor (Q0) of 3.8×1010 at 16 MV/m and 3.6×1010 at 21 MV/m in the horizontal test. The cryomodule can operate stably up to a total continuous wave rf voltage greater than 193 MV, with an average cavity usable accelerating gradient of more than 23 MV/m. The results significantly exceed the specifications of Circular Electron Positron Collider and Dalian advanced light source and the other high repetition rate free electron laser facilities [Linac Coherent Light Source II (LCLS-II), LCLS-II-high energy, Shanghai High Repetition Rate X-ray FEL and Extreme Light Facility, Shenzhen Superconducting Soft X-Ray Free Electron Laser, etc.]. There is evidence that the mid-T bake cavity may not require fast cooldown or long processing time in the cryomodule. This paper reviews the cryomodule performance and discusses some important issues in cryomodule assembly and testing.

关键词： Radio frequency techniques Superconducting RF

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Studies on New Steroidal Saponins from Allii macrostemonis Bulbus and Their Antitumor Activities

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Chemical Research in Chinese Universities 2018年第1期34卷 61-66页

作者： YAO Hua WANG Tong WU Qian liu Ying LI Peng LI xuwen JIN Yongri Scienttfic Research Center China-Japan Union Hospital of Jilin University Changchun 130033 P. R. China College of Chemistry Jilin University Changchun 130012 P. R. China

Two new steroidal saponms（2, 3） and two known compounds（1, 4） were isolated from 75% ethanol extract ofAllii macrostemonis bulbus by various spectral methods. The two new steroidal saponins were respectively elucidated as （25S）-26-O-β-D-glucopyranosyl-5α-furostanol-2α,3β,22,26-tetrol-3-O-β-D-glucopyranosyl（1→2）-[β-D- glucopyranosyl（1→3）]-β-D-glucopyranosyl（1→4 ）-β-D-galactopyranoside（2 ） and 26-O-β-D-glucopyranosyl-5α- furostanol-25（ 27）-ene-3β,22,26-tetrol-3-O-β-D-glucopyranosyl（ 1→2 ）-[β-D-glucopyranosyl（ 1→3 ）] -β-D-glucopyranosyl- （1→4）-β-D-galactopyranoside（3）. Compound 4 was obtained from this medical plant for the first time. The activity experiments of proliferation inhibition on tumor cells were performed by cell counting kit-8（CCK-8） method for compound 2（25S-configuration） and its isomer（compound 1, 25R-configttration）. The results show that compounds 1 and 2 have weak inhibition on lung cancer A549 cells, melanoma A375 cells and breast cancer MCF-7 cells as well as certain inhibitory effect on liver cancer HepG2 cells, and the inhibitory effect of compound 1 is stronger than that of compound 2.

关键词： Allii macrostemonis bulbus Steroidal saponin Structure identification Proliferation inhibition Cell counting kit-8（CCK-8） method

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Transcriptomic and physiological changes in western mosquitofish (Gambusia affinis) after exposure to norgestrel

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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019年 171卷 579-586页

作者： Hou, Liping Chen, Shanduo liu, Juan Guo, Jingwen Chen, Zhong Zhu, Qiaoling Zhang, Wei Xu, GuoLiang Liang, Ye Wu, Rongrong Fang, xuwen Zhang, Cuiping Xing, Ke Guangzhou Univ Sch Life Sci Guangzhou 510655 Guangdong Peoples R China Shantou Univ Guangdong Prov Key Lab Marine Biotechnol Shantou 515063 Peoples R China Guangzhou Univ Key Lab Water Qual & Conservat Pearl River Delta Guangdong Prov Key Lab Radionuclides Pollut Contr Minist EducInst Environm Res Greater Bay Guangzhou 510006 Guangdong Peoples R China Guangzhou Univ Coll Environm Sci & Engn Guangzhou 510655 Guangdong Peoples R China NanWu Middle Sch Guangzhou 510655 Guangdong Peoples R China Guangzhou Tieyi Middle Sch Guangzhou 510655 Guangdong Peoples R China Rural Nonpoint Source Pollut Comprehens Managemen Guangzhou 510655 Guangdong Peoples R China

Norgestrel (NGT) is a synthetic progestin used in human and veterinary medicine. Adult female mosquitofish were exposed to NGT for 42 d at 377 ng L-1. The fin morphology and the liver transcriptome were assessed. NGT exposure increased ray 4:6 length ratio. As compared to the control, NGT treatment affected the expression of 11,772 annotated transcripts in female mosquitofish. Specifically, we found 5780 were repressed while 5992 were significantly induced. Gene ontology (GO) analysis showed that 53 KEGG (Kyoto Encyclopedia of Genes and Genomes) pathways and 158 GO terms were significantly over expressed. Genes showing the largest magnitude of expression changes were related to fin development, androgen biosynthesis, and lipid and fatty acid metabolisms, suggesting the involvement of these biological processes in response to NGT exposure in G. affinis. This first comprehensive study on the transcriptomic alterations by NGT in G. affinis not only provides valuable information on the development of molecular markers but also opens new avenues for studies on the molecular mechanisms of effects of NGT in particular and possibly other progestins in G. affinis.

关键词： Endocrine disruption Norgestrel Secondary sexual characteristics transcriptomics Gambusia affinis

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Aluminum oxide/titanium dioxide nanolaminates grown by atomic layer deposition: Growth and mechanical properties

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JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A 2017年第1期35卷 01B105-01B105页

作者： Ylivaara, Oili M. E. Kilpi, Lauri liu, xuwen Sintonen, Sakari Ali, Saima Laitinen, Mikko Julin, Jaakko Haimi, Eero Sajavaara, Timo Lipsanen, Harri Hannula, Simo-Pekka Ronkainen, Helena Puurunen, Riikka L. VTT Tech Res Ctr Finland POB 1000 FI-02044 Espoo 02044 Finland Aalto Univ Dept Mat Sci & Engn Sch Chem Technol POB 16200 FI-00076 Aalto Finland Aalto Univ Dept Micro & Nanosci Sch Elect Engn POB 13500 FI-00076 Aalto Finland Univ Jyvaskyla Dept Phys POB 35 FI-40014 Jyvaskyla Finland

Atomic layer deposition (ALD) is based on self-limiting surface reactions. This and cyclic process enable the growth of conformal thin films with precise thickness control and sharp interfaces. A multilayered thin film, which is nanolaminate, can be grown using ALD with tuneable electrical and optical properties to be exploited, for example, in the microelectromechanical systems. In this work, the tunability of the residual stress, adhesion, and mechanical properties of the ALD nanolaminates composed of aluminum oxide (Al2O3) and titanium dioxide (TiO2) films on silicon were explored as a function of growth temperature (110-300 degrees C), film thickness (20-300 nm), bilayer thickness (0.1-100 nm), and TiO2 content (0%-100%). Al2O3 was grown from Me3Al and H2O, and TiO2 from TiCl4 and H2O. According to wafer curvature measurements, Al2O3/TiO2 nanolaminates were under tensile stress;bilayer thickness and growth temperature were the major parameters affecting the stress;the residual stress decreased with increasing bilayer thickness and ALD temperature. Hardness increased with increasing ALD temperature and decreased with increasing TiO2 fraction. Contact modulus remained approximately stable. The adhesion of the nanolaminate film was good on silicon. (C) 2016 American Vacuum Society.

关键词： Titanium dioxide

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胶体果胶铋动力黏度的测定方法

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山西化工 2020年第6期40卷 4-6,10页

作者：李娜王旭文刘艳之山西振东安特生物制药有限公司山西晋中030600

目的:建立胶体果胶铋动力黏度的测定方法,为其质量控制提供新方法。方法:将胶体果胶铋加适量水分散后,再加人工胃液形成高黏度的稳定溶胶,采用转子型旋转黏度计测定上述溶胶在37℃条件下的动力黏度。结果:3批样品动力黏度平均值分别为55... 详细信息

目的:建立胶体果胶铋动力黏度的测定方法,为其质量控制提供新方法。方法:将胶体果胶铋加适量水分散后,再加人工胃液形成高黏度的稳定溶胶,采用转子型旋转黏度计测定上述溶胶在37℃条件下的动力黏度。结果:3批样品动力黏度平均值分别为557.6、634.0、627.3 mPa·s,RSD分别为1.45%、1.43%、1.41%(n=6);样品溶液6 h内较稳定。结论:该方法简便、准确、重复性好,适合用于测定胶体果胶铋的动力黏度。

关键词：胶体果胶铋动力黏度旋转黏度计人工胃液

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早熟棉花品种——金垦1565

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中国棉花 2021年第11期48卷 27-28,F0003页

作者：孔宪辉余渝王旭文司爱君刘文豪赵福相刘丽新疆农垦科学院棉花研究所/农业农村部西北内陆区棉花生物学与遗传育种重点实验室新疆石河子832000

金垦1565于2021年8月通过新疆维吾尔自治区农作物品种审定委员会审定,在北疆早熟棉区的生育期为123 d左右,株型紧凑,植株呈筒形,Ⅰ~Ⅱ式果枝,吐絮畅,含絮好,易摘拾;高抗枯萎病,耐黄萎病。2016―2017年新疆早熟棉组区域试验中,金垦1565... 详细信息

金垦1565于2021年8月通过新疆维吾尔自治区农作物品种审定委员会审定,在北疆早熟棉区的生育期为123 d左右,株型紧凑,植株呈筒形,Ⅰ~Ⅱ式果枝,吐絮畅,含絮好,易摘拾;高抗枯萎病,耐黄萎病。2016―2017年新疆早熟棉组区域试验中,金垦1565平均籽棉、皮棉产量分别为4778.3 kg·hm^(-2)、1954.5 kg·hm^(-2)。本文简要介绍了金垦1565的选育过程、特征特性、产量表现、纤维品质、抗病性及栽培技术。

关键词：早熟棉花品种金垦1565 高产优质抗病性纤维品质栽培技术

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Metabolomics analysis of Danggui Sini decoction on treatment of collagen-induced arthritis in rats

Metabolomics analysis of Danggui Sini decoction on treatment...

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第四届中荷代谢组学论坛

作者： Bang Cheng Hua Zheng Fang Wu Jinxia Wu xuwen liu Chaoling Tang Shiyin Lu Zhaoni Chen Fangming Song Junxiang Ruan Hongye Zhang Hui Song Wei liu Hongwei Guo Yonghong Liang Zhiheng Su Pharmaceutical College Guangxi Medical UniversityNanning 530021China Medical Research Center Guangxi Medical UniversityNanning 530021Chin Pharmaceutical College Guangxi Medical UniversityNanning 530021China Department of Clinical Pharma

Rheumatoid arthritis(RA)is a chronic autoimmune disorder characterized by persistent joint inflammation leading to bone and cartilage damage and even ***,the pathogenesis of RA is multi-factorial and to a large degree,remains *** Sini decoction(DSD),a traditional Chinese medicine(TCM)formula,has been widely used as a remedy for rheumatoid arthritis(RA)in recent *** our study,1H-nuclear magnetic resonance(1H-NMR)based metabolomics analysis of 7 potential biomarkers,including taurine(1),urea(2),betaine(3),pyruvate(4),hippurate(5),succinate(6)and acetone(7)was performed to investigate the progression of RA and assess the efficacy of DSD in collagen-induced arthritis(CIA)*** to pathway analysis using identified metabolites and correlation construction,taurine and hypotaurine metabolism,gut microbiota metabolism,pyruvate metabolism,glycolysis/gluconeogenesis,the citrate cycle(TCA cycle)and lipid metabolism were recognized as being the most influenced metabolic pathways associated with *** a result,deviations of metabolites 1,3,4,5,6 and 7 in CIA rats were improved by DSD,which suggested that DSD mediated the abnormal metabolic pathways *** summary,the efficacy and its underlying therapeutic mechanisms of DSD on RA were systematically investigated and expect to provide a new insight in relevant studies of other TCM formulas.

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Synthesis of Composite Carbon-Based Nano-Zero-Valent Iron Micro-Electrolytic Material and Removal of Dichloromethanesulfonic Acid in Drinking Water

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NANO 2019年第5期14卷

作者： liu, Kai Shangguan, Zhonghua Zhang, Xiaohang Shi, Yali Wang, Hao Yang, Shipeng He, xuwen China Univ Min & Technol Sch Chem & Environm Engn 11 Xueyuan Rd Beijing 100083 Peoples R China Xian Zhongdi Environm Technol Co Ltd Xian Geol Survey Ctr China Geol Survey Youyi East Rd Xian 710054 Shanxi Peoples R China Chinese Acad Sci Res Ctr Ecoenvironm Sci 18 Shuangqing Rd Beijing 100085 Peoples R China Tsinghua Univ Sch Environm 30 Shuangqing Rd Beijing 100084 Peoples R China

Composite carbon-based nano-zero-valent iron materials not only have excellent characteristics of nano materials, but also solve the difficulty of recycling nano materials after use, and overcome the shortcomings of the nano materials. The introduction of copper increases the redox reaction activity of the micro-electrolytic material and expands the applicable pH range of the reaction environment. In the range of pH = 3-9, the removal efficiency of dichloromethanesulfonic acid (Cl-2-MSA) was maintained at 95.5-99.7% after 30 min. Continuous dynamic simulation experiments verified that the composite carbon-based nano zero-valent iron material has a stable removal effect on the target pollutants.

关键词： Nano-zero-valent iron micro-electrolytic dichloromethanesulfonic acid

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