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Development of the bunch-by-bunch beam position acquisition system based on BEEcube

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Nuclear Science and Techniques 2016年第2期27卷 86-91页

作者： Yong Yang Yong-Bin Leng Ying-Bing Yan wei-min zhou Ren-Xian Yuan Zhi-Chu Chen Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049China

In this paper, we report the development of a bunch-by-bunch beam position acquisition *** a wideband synthesizer of PLL, the system realizes synchronous clock of bunch signal. Based on the highperformance FPGA hardware DAQ environment, fourchannel raw data of beam signal can be achieved. Test results in the SSRF storage ring show that the system can obtain beam position of single bunch with the resolution of10 lm and multi-bunch instability can be observed.

关键词：采集系统束流位置基础同步时钟数据采集 FPGA 原始数据合成器

Single-order soft x-ray spectra with spectroscopic photon sieve

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Chinese Physics B 2020年第5期29卷 225-228页

作者： Yu-Lin Gao Lai wei Qiang-Qiang Zhang Zu-Zua Yang wei-min zhou Lei-Feng Cao Hi-tech Research and Development Centre China Academy of Engineering PhysicsBeijing 100094China China Jiuyuan Hi-Tech Equipment Corporation Limited Beijing 100094China National Key Laboratory for Laser Fusion Research Center of Laser FusionMianyang 621900China

A single-order diffraction transmission grating named spectroscopic photon sieve(SPS)for soft x-ray region is proposed and demonstrated in this *** SPS consists of many circular pinholes located randomly,and can realize both free-standing diffractions and the suppression of higher-order *** this paper,the basic concept,numerical simulations,and calibration results of a 1000-lines/mm SPS for soft x-ray synchrotron radiation are *** predicted by theoretical calculations,the calibration results of a 1000-lines/mm SPS verify that the higher-order diffractions can be significantly suppressed along the symmetry *** the current nanofabrication technique,the SPS can potentially have a higher line density,and can be widely used in synchrotron radiation,laser-induced plasma diagnostics,and astrophysics.

关键词： higher-order diffraction suppression extreme ultraviolet and soft x-rays single-order diffraction grating

Quantum splitting of electron peaks in ultra-strong fields

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Matter and Radiation at Extremes 2023年第5期8卷 26-34页

作者： Bo Zhang Zhi-Meng Zhang wei-min zhou AFFILIATIONS Key Laboratory of Plasma Physics Research Center of Laser FusionCAEPMianshan Rd 64621900 MianyangSichuanChina

Effects of multiple nonlinear Compton scattering on electrons in ultra-strong fields are described using analytic formulas similar to those in the theory of multiple *** on these analytic formulas,a new pure quantum effect of multiple nonlinear Compton scattering called quantum peak splitting is identified:the electron peak splits into two when the average number of nonlinear Compton scatterings per electron passes a threshold of 5.1 and is below *** peak splitting stems from the discreteness of quantum radiation reaction,with one of the split peaks being formed by electrons emitting zero to three times and the other by electrons emitting four or more *** effect provides a new mechanism for the formation of electron peaks,imposes a new beamstrahlung limit on future colliders,and corrects the picture of quantum radiation *** can be performed on lasers with intensities≳10^(21)W/cm^(2),which are reachable on PW-scale facilities.

关键词： reaction splitting quantum

Multivariate model for predicting semen ：ryopreservation outcomes in a human sperm ban

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Asian Journal of Andrology 2017年第4期19卷 404-408页

作者： Xu-Ping Jiang wei-min zhou Shang-Qian Wang wei Wang Jing-Yuan Tang Zhen Xu Zhao-Xia Zhang Chao Qin Zeng-Jun Wang wei Zhang Department of Urology Yixing People's Hospital Yixing 214200 China State Key Laboratory of Reproductive Medicine Department of Urology The First Affiliated Hospital of Nanjing Medical University Nanjing 210029 China Human Sperm Bank Department of Urology The First Affiliated Hospital of Nanjing Medical University Nanjing 210029 China

Semen cryopreservation is widely used in assisted reproductive technologies, but it reduces sperm quality dramatically. The aim of this study was to develop a model using basal semen quality to predict the outcome of postthaw semen parameters and improve the efficiency of cryopreservation in a human sperm bank. Basal semen parameters of 180 samples were evaluated in the first stage, and a multiple logistic regression analysis involving a backward elimination selection procedure was applied to select independent predictors. After a comprehensive analysis of all results, we developed a new model to assess the freezability of sperm. Progressive motility （PR）, straight-line velocity （VSL） and average path velocity （VAP） were included in our model. A greater area under the receiver operating characteristic curve was obtained in our model when compared with other indicators. In the second stage of our study, samples that satisfied the new model were selected to undergo freeze-thawing. Compared with the first stage, the rate of good freezability was increased significantly （94% vs 67%, P = 0.003）. By determining basal semen quality, we have developed a new model to improve the efficiency of cryopreservation in a human sperm bank.

关键词： cryopreservation freezability model sperm bank

Effects of CYP3A5 polymorphisms on tacrolimus pharmacokinetics in pediatric kidney transplantation:a systematic review and meta-analysis of observational studies

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World Journal of Pediatrics 2017年第5期13卷 421-426页

作者： Yi-Ping Zong Zi-Jie Wang Wan-Li zhou wei-min zhou Tie-Liang Ma Zheng-Kai Huang Chun-Chun Zhao Zhen Xu Ruo-Yun Tan min Gu Department of Urology Nanjing Medical University First Affiliated HospitalNanjingChina Department of Urology The Affiliated Yixing Hospital of Jiangsu UniversityYixingChina Department of Urology Nanjing Medical University First Affiliated HospitalNanjingChina Central Laboratory The Affiliated Yixing Hospital ofJiangsu UniversityYixingChina

Background:CYP3A5 genetic polymorphisms have been reported to be strongly associated with the tacrolimus pharmacokinetics in adult kidney ***,there is no published meta-analysis in the influence of CYP3A5 variants on the requirements of the tacrolimus dose in pediatric renal-transplant recipients (RTRs).We wished to determine the effects of CYP3A5 polymorphisms on tacrolimus pharmacokinetics in pediatric ***:A literature search was conducted to include relevant articles by searching PubMed,EMBASE and the Cochrane Central Register of Controlled ***-associated parameters such as dose administration,as well as concentrations and dose-adjusted concentrations of tacrolimus were extracted and the metaanalysis ***:The meta-analysis involved four studies and one study series involving 268 pediatric RTRs.A significant difference was observed in the mean trough concentration/ dose of tacrolimus between recipients carrying CYP3A5* 3/*3 variants (referred to as 'non-expressers') and those carrying CYP3A5*1 (referred to as 'expressers') [standard mean difference (SMD)=-1.09,95% confidence interval (CI):-1.92 to-0.25,P=0.011].Moreover,significance was observed in the mean daily dose of tacrolimus between nonexpressers and expressers in pediatric RTRs (SMD=0.44,95% CI:0.20 to 0.68,P<0.001).Conclusion:Our meta-analysis identified a positive correlation between CYP3A5 genotypes and tacrolimus pharmacokinetics in pediatric RTRs.

关键词： CYP3A5 kidney transplantation meta-analysis pediatric tacrolimus

Detailed calibration of the PI-LCX：1300 high performance single photon counting hard x-ray CCD camera

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Chinese Physics B 2017年第2期26卷 334-340页

作者： wei Hong Xian-Lun Wen Lai wei Bin Zhu Yu-Chi Wu Ke-Gong Dong Chun-Ye Jiao Bo Wu Ying-Ling He Fa-Qiang Zhang wei-min zhou Yu-Qiu Gu Science and Technology on Plasma Physics Laboratory Laser Fusion Research Center China Academy of Engineering Physics Mianyang 621900 China

X-ray charge-coupled-device（CCD） camera working in single photon counting mode is a type of x-ray spectrometer with high-sensitivity and superior signal-to-noise performance. In this study, two single photon counting CCD cameras with the same mode（model： PI-LCX： 1300） are calibrated with quasi-monochromatic x-rays from radioactive sources and a conventional x-ray tube. The details of the CCD response to x-rays are analyzed by using a computer program of multi-pixel analyzing and event-distinguishing capability. The detection efficiency, energy resolution, fraction of multi-pixel events each as a function of x-ray energy, and consistence of two CCD cameras are obtained. The calibrated detection efficiency is consistent with the detection efficiency from Monte Carlo calculations with XOP program. When the multi-pixel event analysis is applied, the CCDs may be used to measure x-rays up to 60 ke V with good energy resolution（E /？E ≈ 100 at60 ke V）. The difference in detection efficiency between two CCD cameras is small（5.6% at 5.89 ke V）, but the difference in fraction of the single pixel event between them is much larger（25% at 8.04 ke V）. The obtained small relative error of detection efficiency（2.4% at 5.89 ke V） makes the high accurate measurement of x-ray yield possible in the laser plasma interaction studies. Based on the discrete calibration results, the calculated detection efficiency with XOP can be used for the whole range of 5 ke V–30 ke V.

关键词： hard x-ray detector single photon counting CCD calibration laser plasmas

Effects of trimetazidine on atrial structural remodeling and platelet activation in dogs with atrial fibrillation

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Chinese Medical Journal 2009年第18期122卷 2180-2183页

作者： HAN wei LI wei-min zhou Hong-yan HUO Hong wei Na DONG Guo CAO Yong zhou Guo YANG Shu-sen Department of Cardiology First Clinical College of Harbin Medical University Harbin Heilongjiang 150001 China

Atrial fibrillation （AF） is one of the most common .arrhythmias in clinical practice. AF results in electrophysiological alterations which involve increased atrial effective refractory period and atrial effective refractory period dispersion, reduced rate adaptation of atrial effective refractory period, and slowed atrial conduction. These variances promote their own maintenance-AF begets AF.1 Previous study suggested that Ca^2＋ overload and metabolic derangement contributed to electrophysiological remodeling in AF. However, we did not demonstrate a persistent disturbance in energy metabolism during AF in our previous study,

关键词： atrialfibrillation structural remodeling thrombosis trimetazidine

CARBON FILMS PREPARED BY PLASMA POLYMERIZATION OF NATURAL GAS (Ⅲ) APPLICATION OF CARBON FILM TO MAGNETIC RECORDING MEDIA

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Journal of Energy Chemistry 1992年第3期 270-277页

作者： CAO wei-min zhou Kun-Lin zhou Rui-Hua ZHANG Ji-Ren Chengdu Institute of Organic Chemistry,Academia Sinica Chengdu,Sichuan 610015 Received April 20,1992

Amorphous carbon film was deposited on thin-film magneticrecording disk and tape by RF glow discharge decpmposition of *** and corrosion resistances of the coated media were improved withoutany deterioration of magnet... 详细信息

关键词： APPLICATION OF CARBON FILM TO MAGNETIC RECORDING MEDIA test CARBON FILMS PREPARED BY PLASMA POLYMERIZATION OF NATURAL GAS

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产业集群与县域经济发展

陕西师范大学学报(哲学社会科学版) 2008年第5期37卷 81-85页

作者：魏民洲中共陕西省委

产业集群对县域经济的发展具有明显的聚集效应,在提高县域经济的规模化水平、经济发展的竞争力和创新能力、促进产业结构的提升和优化、提高农村工业化和城镇化水平等方面可以发挥重要作用。政府在营造产业集群,加快发展县域经济中应采... 详细信息

产业集群对县域经济的发展具有明显的聚集效应,在提高县域经济的规模化水平、经济发展的竞争力和创新能力、促进产业结构的提升和优化、提高农村工业化和城镇化水平等方面可以发挥重要作用。政府在营造产业集群,加快发展县域经济中应采取以下对策:构建产业集群发展的政策环境;培育具有比较优势的特色产业集群;积极推动产业的集中;加快小城镇建设步伐;优化县域投融资体制。

关键词：产业集群县域经济区域经济发展