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Power losses caused by longitudinal HOMs in 1.3-GHz cryomodule of SHINE

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Nuclear Science and Techniques 2019年第7期30卷 16-26页

作者： Jun-Jie guo qiang gu Meng Zhang Zhen Wang Jian-Hao Tan Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049 China Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201210 China

Shanghai high-repetition-rate XFEL and extreme light facility (SHINE), the first hard XFEL based on a superconducting accelerated structure in China, is now under development at the Shanghai Institute of Applied Physics, Chinese Academy of Sciences. In this paper, power losses caused by trapped longitudinal high-order modes (HOM), steady-state loss, and transient loss generated by untrapped HOMs in the 1.3-GHz SHINE cryomodule are investigated and calculated. The heat load generated by resistive wall wakefields is considered as well. Results are presented for power losses of every element in the 1.3-GHz cryomodule, caused by HOM excitation in the acceleration RF system of the continuouswave linac of SHINE.

关键词： Power loss Higher-order modes (HOMs) Resistive wall wakefields Impedance Superconducting cavities

APPLICATIONS OF INTRANASAL LOW INTENSITY LASER THERAPY IN SPORTS MEDICINE

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Journal of Innovative Optical Health Sciences 2010年第1期3卷 1-16页

作者： TIMON CHENG-YI LIU DE-FENG WU ZHI-qiang gu MIN WU Lab of Laser Sports Medicine College of Life Science South China Normal University GuangzhouGD510006China

Function-specific homeostasis(FSH)has been defined as a negative-feedback response of a biosystem to maintain its interior function-specific conditions so that the function is perfectly *** is no photobiomodulation of intranasal low intensity laser therapy(ILILT)on a function in its FSH,but ILILT could modulate a function far from its *** rehabilitation has been found to be mediated by the ratio of intracellular nicotinamide adenine dinucleotide(NAD+)and its reduced form NADH,NAD+/NADH,and then sirtuin 1(SIRT1).There might be FSH-specific NAD+/NADH(FSN)and SIRT1 activity(FSA).ILILT might enhance NAD+/NADH and SIRT1 activity until they arrive at FSN and FSA,*** NAD+/NADH and SIRT1 activity of related cells of many athletic diseases such as upper respiratory tract infection,asthma,osteoarthritis,exercise-induced muscle damage,wound,traumatic brain injury,and osteoporosis are lower than FSN and FSA,***,there may be therapeutic effects of ILILT on those athletic ***,many phenomena and the ILILT mechanism have been integrated to support the prophylaxis effects of ILILT on the swine-origin influenza A(H1N1).

关键词： Photobiomodulation homeostasis nicotinamide adenine dinucleotide sirtuin 1 sports medicine

Velocity bunching for the linac of Shanghai Deep UV FEL facility

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Nuclear Science and Techniques 2012年第3期23卷 134-138页

作者： ZHANG Meng gu Duan gu qiang LIN guoqiang LAN Taihe WANG Xingtao DENG Haixiao Shanghai Institute of Applied Physies Chinese Academy of Sciences Shanghai 201800 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

High brightness electron beam is one of the main goals of the research and development effort in RF *** with the normally used magnetic chicane,an alternative scheme,commonly known as 'velocity bunching',has been proposed as a tool to compress electron beam pulses in modern high brightness photo-injector *** paper presents numerical optimization systematically and the first attempt to demonstrate the velocity bunching scheme on SDUV-FEL linac *** relationship between the degree of bunching and the off-crest phase of the accelerating structure is explored *** bunching operating mode illustrates flexible performances with an intrinsic machine jitter,which agrees well with the theoretical prediction.

关键词：速度聚束直线加速器自由电子激光深紫外高亮度电子束设施上海调制解调器

Radio-frequency design of a new C-band variable power splitter

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Nuclear Science and Techniques 2019年第6期30卷 122-128页

作者： Zong-Bin Li Alexej Grudiev Wen-Cheng Fang qiang gu Zhen-Tang Zhao Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049 China European Organization for Nuclear Research 1211 Geneva Switzerland

A novel variable C-band radio-frequency (RF) power splitter was designed at Shanghai Institute of Applied Physics, Chinese Academy of Sciences. Using three RF impedance combiners, an H-bend, and an RF polarizer, this new power splitter is much more compact than a traditionally designed splitter, which comprises three 3-dB hybrids. The parameters were optimized to achieve good matching and minimize reflection. Here, the RF design of the new C-band variable power splitter is presented.

关键词： Power splitter Variable Polarizer Compact

Novel optical properties and induced magnetic moments in Ru-doped hybrid improper ferroelectric Ca3Ti2O7

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Journal of Advanced Ceramics 2021年第1期10卷 120-128页

作者： Xingxing WU Shouyu WANG Winnie WONG-NG qiang gu Yao JIANG Chao WANG Shuang MA Weifang LIU Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology School of ScienceTianjin UniversityTianjin 300072China College of Physics and Material Science Tianjin Normal UniversityTianjin 300074China Materials Measurement Science Division National Institute of Standards and TechnologyGaithersburgMaryland 20899USA

Hybrid improper ferroelectric Ca3Ti2O7 and Ca3Tii ***7 ceramics were successfully synthesized by conventional solid-state reaction *** strongest diffraction peaks located around 2θ=33°shifted towards the lower angle region with Ru substitution,reflecting structure *** growth and higher oxygen vacancy concentration after doping resulted in a reduction in the coercive field about 20 kV/*** bandgap estimated by UV-vis diffuse reflectance(DR)spectrum and X-ray photoelectron spectroscopy(XPS)valence band spectra showed a decreasing trend due to the existence of impurity energy level upon Ru doping,which was consistent with the results of first-principles *** origin of the unexpected induced magnetic moments in Ru-dope Ca3Ti2O7 is also discussed.

关键词： oxides electronic materials optical properties X-ray diffraction defects lectronic structure ferroelectricity

Cytochrome P45026A1 Contributes to the Maintenance of Neuropathic Pain

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Neuroscience Bulletin 2024年第3期40卷 293-309页

作者： De-Li Cao Ling-Jie Ma Bao-Chun Jiang qiang gu Yong-Jing Gao Institute of Pain Medicine and Special Environmental Medicine Co-innovation Center of NeuroregenerationNantong UniversityNantong226019China Nantong University Medical School Nantong226001China Department of Pain Management The Affiliated Hospital of Nantong UniversityNantong226001China

The cytochrome P450 proteins(CYP450s)have been implicated in catalyzing numerous important biological reactions and contribute to a variety of ***26A1,a member of the CYP450 family,carries out the oxidative metabolism of retinoic acid(RA),the active metabolite of vitamin *** we report that CYP26A1 was dramatically upregulated in the spinal cord after spinal nerve ligation(SNL).CYP26A1 was mainly expressed in spinal neurons and *** analysis displayed that the content of all-trans-RA(at-RA),the substrate of CYP26A1,was reduced in the spinal cord on day 7 after *** of CYP26A1 by siRNA or inhibition of CYP26A1-mediated at-RA catabolism by talarozole relieved the SNL-induced mechanical allodynia during the maintenance phase of neuropathic *** also reduced SNL-induced glial activation and proinflammatory cytokine production but increased anti-inflammatory cytokine(IL-10)*** RA receptors RARα,RXRβ,and RXRγwere expressed in spinal neurons and glial *** promoter of Il-10 has several binding sites for RA receptors,and at-RA directly increased Il-10 mRNA expression in ***,intrathecal IL-10 attenuated SNL-induced neuropathic pain and reduced the activation of astrocytes and ***,the inhibition of CYP26A1-mediated at-RA catabolism alleviates SNL-induced neuropathic pain by promoting the expression of IL-10 and suppressing glial ***26A1 may be a potential therapeutic target for the treatment of neuropathic pain.

关键词： CYP26A1 Microglia Astrocytes ERK P38 IL-10 Neuropathic pain

Microwave-assisted Synthesis of New 1,2,3-Triazoles Bearing an Isoxazole Ring by the Azide-alkyne Cycloaddition Click Chemistry

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Chemical Research in Chinese Universities 2018年第2期34卷 197-202页

作者： LI Jing LIU Hongwei MENG Fanyu YAN Liuqing SHI Yanpeng ZHANG Yumin gu qiang College of Chemistry Jilin University Changchun 130012 P. R. China National-Local Joint Engineering Laboratory of In-situ Conversion Drilling and Exploitation Technology for Oil Shale Changchun 130021 17. R. China

A comparison synthesis of 1,2,3-triazoles bearing isoxazole ether was developed between conventional and microwave-assisted heating. Single/donble 1,2,3-triazoles bearing isoxazole ether were synthesized by click reaction starting from substituted isoxazolyl alkyne compounds and substituted benzyl azide compounds or neopen- tylglycol diazide in the presence of copper（I） that in-aim generated. Herein, the effect of different catalysts on the yield was researched by conventional method, and the optimal catalyst was selected. The structures of all the synthe- sized compounds were confirmed by MS, FTIR, ^1H and ^13C NMR spectroscopies. Moreover, the crystal structure of 5-{[（1-benzyl-1H-1,2,3-triazol-4-yl）methoxvlmethvl}-3-（4-fluoroohenvl）isoxazole（2h） was determined.

关键词： Microwave-assisted heating 1,2,3-Triazole Isoxazole Azide-alkyne Click chemistry

A New Tetrasubstituted Imidazole Based Difunctional Probe for UV-spectrophotometric and Fluorometric Detecting of Fe^3+Ion in Aqueous Solution

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Chemical Research in Chinese Universities 2019年第2期35卷 200-208页

作者： SHI Yanpeng CHEN Xiaodong MI Zhiming ZHENG Ran FAN Jie gu qiang ZHANG Yuinin College of Chemistry Jilin UniversityChangchun 130012P.R.China

Two new compounds,4-(2-bromophenxl-4,5-diphenyl-imidazol-1-yl)ani 1 ine(probe 1)and 4-[2,4,5-tris(4-bromopheny1)-1H-imidazol-1-y1]aniline(probe 2),were synthesized via a soft and high-efficiency one-pot microwave-assisted method under solvent-free *** sensing to different metal ions was detected by UV spectrophotometry and fluorescence *** 2 revealed highly selective and sensitive UV and fluorescence response to Fe^3+*** the addition of Fe^3+ion,probe 2 showed obvious color change of the solution,conspicuous absorbance enhancement and relatively quick fluorescence *** detection limit for Fe^3+ion was respectively calculated to be 0.72μmol/L(fluorescent detection)and 0.48μmol/L(UV-spectnim detection).Also,probe 2 was bound by Fe^3+ion to tonn a 1:1 ***,preliminary application of probe 2 tor detecting Fe^3+ion in aqueous solution was attempted,and satisfying results were obtained.

关键词： Fe^3+ion probe Imidazole Fluorescence quenching Absorbance enhancement Microwave synthesis

The nonresonant perturbation theory based field measurement and tuning of a linac accelerating structure

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Science China(Physics,Mechanics & Astronomy) 2013年第11期56卷 2104-2109页

作者： FANG WenCheng TONG DeChun gu qiang ZHAO ZhenTang SHENG Xing CHEN LiFang WANG Lin Shanghai Institute of Applied Physics (SINAP) Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences Department of Engineering Physics Tsinghua University Beijing Vacuum Electronic Research Institute

Assisted by the bead pull technique,nonresonant perturbation theory is applied for measuring and tuning the field of the linac accelerating *** method is capable of making non-touching amplitude and phase measurements,real time mismatch feedback and field *** key considerations of the measurement system and of a C-band traveling-wave structure are discussed,and the bead pull measurement and the tuning of the C-band traveling-wave linac accelerating structure are presented at last.

关键词： nonresonant perturbation accelerating structure RF test tuning