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Beam-beam effects and mitigation in a future proton-proton collider

Nuclear Science and Techniques 2022年第10期33卷 90-105页

作者： Li-jiao Wang Tanaji Sen Jing-Yu Tang lin-Hao Zhang Institute of High Energy Physics CASYuquan Road 19BBeijing 100049China University of Chinese Academy of Sciences CAS19A Yuquan RoadBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China Fermi National Accelerator Laboratory P.O.Box 500BataviaIL 60510USA

The beam-beam effects in a hadron collider with an unprecedented energy scale were *** effects are strongly related to the attainable luminosity of the ***-range interactions were identified as the major factor limiting the dynamic aperture,which is strongly dependent on the crossing angle,β*,and bunch *** mitigation methods of the beam-beam effects were addressed,with a focus on the compensation of long-range interactions by electric curren *** CEPC-SPPC project is a two-stage large circular collider,with a first-stage circular electron-positron collider(CEPC)and a second-stage super proton-proton collider(SPPC).The design of the SPPC aims to achieve a center-of-mass energy of 75 TeV and peak luminosity of approximately 1×10^(35) cm^(-2)s^(-1).We studied the beam-beam effects in the SPPC and tested the effectiveness of the mitigation *** found that with compensation using electric current wires,the dynamic aperture is at an acceptable ***,considering the significant emittance damping in this future proton-proton collider the beam-beam effects and compensation are more complicated and are studied using long-term *** was found that with a smaller emittance,the head-on interactions with a crossing angle become more prominent in reducing the beam stability,and combined head-on and long-range compensation is needed to improve the beam *** the reduction in population owing to burnoff was included,it was found that the coupling between the transverse and longitudinal planes at smaller emittance is the main driving source of the ***,crab cavities and emittance control are also necessary than just the compensation of the long-range interactions to improve the beam *** study serves as an example for studying the beam-beam effects in future proton-proton colliders.

关键词： Particle collider Beam-beam effects Luminosity Tune footprint Dynamic aperture

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Factors controlling fetal echocardiography determine the diagnostic accuracy of isolated ventricular septal defect

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World Journal of Pediatrics 2017年第3期13卷 278-281页

作者： jiao Chen Liang Xie Han-min Liu Department of Ultrasonography West China Second University HospitalSichuan UniversityChengduChina The Vascular Remodeling and Developmental Defects Research Unit West China Institute of Women and Children's HealthWest China Second University HospitalSichuan UniversityChengduChina Department of Pediatric Pneumology West China Second University HospitalSichuan UniversityChengduChina Key Laboratory of Birth Defects and Related Diseases of Women and Children(Sichuan University) Ministry of EducationWest China Second University HospitalSichuan UniversityChengduChina

Background:Fetal echocardiography (FECG) is a key screening tool for prenatal cardiac ***,we examined the ultrasonic factors determining prenatal ultrasonic diagnosis of isolated ventricular septal defect (IVSD).Methods:The diagnostic role of ultrasonic factors was investigated in patients in middle or late pregnancy,diagnosed with IVSD by FECG and confirmed using postnatal ***:One hundred and six patients with IVSD were enrolled;the majority had perimembranous *** combined imaging mode of 2 dimentionalechocardiography (2DE) and color doppler flow imaging (CDFI) showed the highest rate (56.6%) of IVSD detection,while CDFI was more efficient than 2DE (32.1% vs.11.3%).The single-view mode was more efficient than multiple-view mode (75.5% vs.24.5%).The highest efficient mode to detect IVSD was achieved using combined imaging mode on the single view of the left ventricular outflow tract view (LVOTV) (28.3%).FECG correctly classified 71.7% of fetal *** was a significant difference of accuracy rate in classifying IVSD among the three different imaging modes (x2=7.141,P0.05) or between single-view mode and multiple-view mode (x2=0.32,P>0.05).Conclusion:Single LVOTV in CDFI or CDFI combined with 2DE of FECG were the most effective diagnostic modes for fetal IVSD diagnosis.

关键词： congenital heart diseases/defects echocardiography fetal-ultrasound isolated ventricular septal defect

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Evaluating the impacts of converting grain to vegetable fields on nitrate transport in the deep vadose zone of the North China Plain

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Journal of Geographical Sciences 2025年第1期 189-212页

作者： LIU Meiying min Leilei WU lin ZHANG Yucui QI Yongqing WANG Shiqin LIU Binbin GENG Di SHEN Yanjun Hebei Key Laboratory of Water-Saving Agriculture Key Laboratory of Agricultural Water ResourcesCenter for Agricultural Resources ResearchInstitute of Genetics and Developmental BiologyCAS School of Advanced Agricultural Sciences University of Chinese Academy of Sciences

Nitrate （NO3-） accumulation and transport processes in the thick vadose zone affect the evolution of the groundwater NO3-content in intensive agricultural *** land-use change （ALUC）,typically accompanied by substantial alterations in nitrogen fertilizer application and irrigation practices,is an important influencing *** study evaluated the changes in NO3-accumulation and transport in the deep vadose zone （DVZ,below the root zone）,and the groundwater NO3-content associated with ALUC from grain to vegetable fields in the North China Plain （NCP）.The ALUC from grain to vegetable resulted in nitrate–nitrogen （NO3--N） accumulation in DVZ increased by 235.5 kg ha-1m-1（163.2%） in the piedmont plain and 224.9 kg ha-1m-1（102.7%） in the central plain,*** change accelerated downward transport velocity in the DVZ (from 0.81±0.47 to 0.89±0.55 m yr-1in the piedmont plain,and from 0.24±0.12 to 0.92±0.12 m yr-1in the central plain) and increased NO3-leaching *** transport velocity and leaching fluxes resulted in chemical N-fertilizer entering the aquifer in several areas in the piedmont *** impact of the agricultural activity intensity changes,accompanied by the ALUC,on groundwater quantity and quality should be considered in similar regions.

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Assessment of the high-resolution estimations of global and diffuse solar radiation using WRF-Solar

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Advances in Climate Change Research 2023年第5期14卷 720-731页

作者： Yun-Bo LU Lun-Che WANG jiao-jiao ZHOU Zi-Geng NIU ming ZHANG Wen-min QIN Hubei Key Laboratory of Regional Ecology and Environmental Change School of Geography and Information EngineeringChina University of GeosciencesWuhan 430074China Hunan Key Laboratory of Remote Sensing of Ecological Environment in Dongting Lake Area School of Geography and Information EngineeringChina University of GeosciencesWuhanChina Hubei Luojia Laboratory Wuhan 430079China

Compared with physical models,WRF-Solar,as an excellent numerical forecasting model,includes abundant novel cloud physical and dynamical processes,which enablesenable the high-frequency output of radiation components which are urgently needed by the solar energy ***,the popularisation of WRF-Solar in a wide range of applications,such as the estimation of diffuse radiation,suffers from unpredictable influences of cloud and aerosol optical property *** study assessed the accuracy of the improved numerical weather prediction(WRF-Solar)model in simulating global and diffuse *** optical properties at 550 nm,which were provided by a moderate resolution imaging spectroradiometer,were used as input to analyse the differences in accuracies obtained by the model with/without aerosol *** sensitivity of WRF-Solar to aerosol and cloud optical properties and solar zenith angle(SZA)was *** results show the superiority of WRF-Solar to WRF-Dudhia in terms of their root mean square error(RMSE)and mean absolute error(MAE).The coefficients of determination between WRF-Solar and WRF-Dudhia revealed no statistically significant difference,with values greater than 0.9 for the parent and nested *** addition,the relative RMSE(RRMSE%)reached 46.60%.The experiment on WRF-Solar and WRF-Dudhia revealed a negative bias for global radiation,but WRF-Solar attained a slightly lower RMSE and higher correlation coefficient than *** WRF-Solar-simulated results on diffuse radiation under clear sky conditions were slightly poorer,with RMSE,RRMSE,mean percentage error and MAE of 181.93 W m^(−2),170.52%,93.04%and 138 W m^(−2),*** on Himawari-8 cloud data,statistical results on cloud optical thickness(COT)for cloudy days revealed that WRF-Solar overestimated diffuse radiation at COTs greater than ***,when the aerosol optical depth was greater than or equal to 0.8,WRF-Solar also overestimated the diffuse radiation

关键词： WRF-Solar Solar radiation simulation Cloud optical thickness Aerosol optical depth Dependency analysis

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Preparation of Zirconia Based Packing Material and Its Evaluation

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Chinese Chemical Letters 2001年第5期12卷 439-442页

作者： Xiang Na JIA Jun jiao YANG Yu min ZUO Department of Chemistry Nankai UniversityTianjin 300071

A new reversed-phase packing (C-18-PBD-ZrO2) was prepared by depositing and crosslinking 1-octadecene (ODE or C-18) and polybutadiene (PBD) onto the surface of porous zirconia microspheres (5 similar to 10 mum in diameter) which were synthesized by a sol-gel process. These novel column packings possess high mechanical and chemical stability, wider usable pH range and can be used to separate basic compounds with no observable peak tailing.

关键词： Zirconia C18-modified polybutadiene-coatings stationary phase liquid chromatography.

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富血小板血浆联合脂肪干细胞移植加速伤口愈合的临床前研究:系统评价和Meta分析

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中国组织工程研究 2025年第13期29卷 2753-2763页

作者：蔺莉焦琳茜于芳宁马逸朝张博徐旭英首都医科大学附属北京中医医院北京市100010

目的:研究表明,富血小板血浆和脂肪来源干细胞的组合可加速皮肤损伤的愈合,但仍缺乏二者联合治疗的系统证据。该文评价两种干预措施在临床啮齿动物皮肤创伤模型中的联合疗效。方法:检索PubMed、Embase和Cochrane及CNKI数据库,选择各数... 详细信息

目的:研究表明,富血小板血浆和脂肪来源干细胞的组合可加速皮肤损伤的愈合,但仍缺乏二者联合治疗的系统证据。该文评价两种干预措施在临床啮齿动物皮肤创伤模型中的联合疗效。方法:检索PubMed、Embase和Cochrane及CNKI数据库,选择各数据库建库至2023年7月发表的富血小板血浆与脂肪干细胞移植联合使用以及单独使用于实验动物皮肤伤口的研究,以伤口愈合及伤口中转化生长因子β、CD31、Ⅰ型胶原蛋白和血管内皮生长因子为观察指标,使用RevMan 5.3和Stata 15.0软件对数据进行Meta分析。结果:共纳入12项研究,其中8项研究使用大鼠作为实验对象,4项研究使用小鼠作为实验对象,实验组采用富血小板血浆联合脂肪干细胞移植治疗,对照组采用单独的富血小板血浆治疗。Meta分析结果显示,实验组治疗后第3,7,10天的伤口愈合率均大于对照组[SMD=2.65,95%CI(1.29,4.01),Z=3.81,P=0.0001;SMD=3.38,95%CI(2.47,4.30),Z=7.24,P<0.00001;SMD=2.62,95%CI(1.50,3.73),Z=4.61,P<0.00001],实验组伤口愈合时间短于对照组[SMD=-2.12,95%CI(-3.5,-0.74),P=0.003],实验组伤口中的转化生长因子β表达、CD31阳性率、Ⅰ型胶原蛋白及血管内皮生长因子表达均高于对照组[SMD=5.65,95%CI(1.22,10.08),Z=2.50,P=0.01;SMD=2.49,95%CI(1.96,3.02),Z=9.28,P<0.00001;SMD=3.44,95%CI(0.72,6.17),Z=2.48,P=0.01;SMD=2.38,95%CI(0.97,3.79),Z=3.30,P=0.0010]。结论:研究结果表明,富血小板血浆与脂肪干细胞联合治疗可提高伤口愈合率、缩短伤口愈合时间,同时增加转化生长因子β、CD31、Ⅰ型胶原蛋白和血管内皮生长因子的表达,加速伤口愈合。由于模型的局限性,需要进行更多的动物实验和临床试验进行进一步证实。

关键词：富血小板血浆脂肪干细胞伤口愈合临床前研究荟萃分析系统评价

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Demonstration of record-high 352-Gbps terahertz wired transmission over hollow-core fiber at 325 GHz

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Science China(Information Sciences) 2022年第2期65卷 241-242页

作者： min ZHU jiao ZHANG Jianjun YU Xiaohu YOU National Mobile Communications Research Laboratory Southeast University School of Information Science and Technology Fudan University

Terahertz (THz) waves,extending from 0.1 to 10 THz,are attracting extensive attention in the interdisciplinary fields of electronics and *** THz band offers a larger available bandwidth,which can meet the Tbps transmission capacity for 6G wireless ***,it could enable high-resolution sensing and imaging to implement Internet of Things (Io T) for trillion communicating devices,owing to the short wavelength compared to the microwave system[1].

关键词： THz communication THz hollow-core fiber optical-THz-optical communication advanced multi-dimension multiplexing techniques THz in-depth coverage

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Nanosheet-stacked flake graphite for high-performance Al storage in inorganic molten AlCl_(3)-NaCl salt

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International Journal of minerals,Metallurgy and Materials 2020年第12期27卷 1711-1722页

作者： Jun-xiang Wang Ji-guo Tu Han-dong jiao d Hong-min Zhu State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China Department of Metallurgy Graduate School of EngineeringTohoku UniversitySendaiMiyagi 9808579Japan

Aluminum storage systems with graphite cathode have been greatly promoting the development of state-of-the-art rechargeable aluminum batteries over the last five years;this is due to the ultra-stable cycling,high capacity,and good safety of the *** study discussed the change of electrochemical behaviors caused by the structural difference between flake graphite and expandable graphite,the effects of temperature on the electrochemical performance of graphite in low-cost AlCl_(3)-NaCl inorganic molten salt,and the reaction mechanisms of aluminum complex ions in both graphite materials by scanning electron microscopy,X-ray diffraction,Raman spectroscopy,cyclic voltammetry,and galvanostatic charge-discharge *** was found that flake graphite stacked with noticeably small and thin graphene nanosheets exhibited high capacity and fairly good rate *** battery could achieve a high capacity of^219 mA·h·g^(-1) over 1200 cycles at a high current density of 5 A·g^(-1),with Coulombic efficiency of 94.1%.Moreover,the reaction mechanisms are clarified:For the flake graphite with small and thin graphene nanosheets and high mesopore structures,the reaction mechanism consisted of not only the intercalation of AlCl4^-anions between graphene layers but also the adsorption of Al Cl4^-anions within mesopores;however,for the well-stacked and highly parallel layered large-size expandable graphite,the reaction mechanism mainly involved the intercalation of AlCl4^-anions.

关键词： flake graphite expandable graphite molten salts aluminum storage intercalation

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Design and simulation of a tuning fork micromachined gyroscope with slide film damping

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光学精密工程 2005年第5期13卷 519-524页

作者： CHE Lu-feng XIONG Bin jiao Ji-wei WANG Yue-lin State Key Laboratory of Transducer Technology Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

A novel tuning fork micromachined gyroscope, based on slide-film damping, is presented. The electrostatic driving gyroscope consists of two driving masses each of which supports one sensitive mass. The angular rate is sensed by the differential capacitances consisted of movable bar electrodes and fixed bar electrodes located on the glass wafer. The gyroscope can operate at atmospheric pressure with slide film damping in the driving and sensing directions, eliminate vacuum packaging and restrain cross-axis acceleration signal. The results of design and simulation show that the driving and sensing mode frequencies are 3 106 Hz and 3 175 Hz,respectively, and the Q-values in driving and sensitive modes are 1 721 and 1 450 respectively. The design resolution is 0.025°/s.

关键词：等效电路模拟角度传感器微电子力学系统电路等效方程

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Differential Analysis of ARX Block Ciphers Based on an Improved Genetic Algorithm

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Chinese Journal of Electronics 2023年第2期32卷 225-236页

作者： KANG Man LI Yongqiang jiao lin WANG mingsheng State Key Laboratory of Information Security Institute of Information EngineeringChinese Academy of Sciences School of Cyber Security University of Chinese Academy of Sciences State Key Laboratory of Cryptology

Differential cryptanalysis is one of the most critical analysis methods to evaluate the security strength of cryptographic algorithms. This paper first applies the genetic algorithm to search for differential characteristics in differential cryptanalysis. A new algorithm is proposed as the fitness function to generate a high-probability differential characteristic from a given input difference. Based on the differential of the differential characteristic found by genetic algorithm, Boolean satisfiability(SAT) is used to search all its differential characteristics to calculate the exact differential probability. In addition,a penalty-like function is also proposed to guide the search direction for the application of the stochastic algorithm to differential cryptanalysis. Our new automated cryptanalysis method is applied to SPECK32 and SPECK48. As a result, the 10-round differential probability of SPECK32 is improved to 2-30.34, and a 12-round differential of SPECK48 with differential probability2-46.78is achieved. Furthermore, the corresponding differential attacks are also performed. The experimental results show our method’s validity and outstanding performance in differential cryptanalysis.

关键词： Ciphers Technological innovation Probability Genetic algorithms

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