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| 1 | Lattice-Valued Proposition Logic(Ⅱ)显示文摘Lattice-ValuedPropositionLogic(Ⅱ)QinKeyun;XuYang(Dept.ofAppl.Mathematics,SouthwestJiaotongUniversity)Chengdu610031,ChinaLatti... | Qin Keyun Xu Yang( Dept. of Appl. Mathematics, Southwest Jiaotong University)Chengdu 610031,China | 1994 | Journal of Modern Transportation1994，11，1： | 13 |
| 2 | Observational evidences for the speed of the gravity based on the Earth tide显示文摘We have found that the current practical Newtonian formula for the gravity tide of the Earth implies a hypothesis that gravity travels at the speed of light; furthermore, we have derived and solved the propagation equation of gravity using the observation data of Earth tides from Shiquanhe and Wushi, after correction of phase lag due to the anelasticity of the Earth, and found that the speeds of gravity are from 0.93 to 1.05 times the speed of light with a relative error of about 5%. This provides first set of strong evidences to show that the speed of gravity is the same as the speed of light. | TANG KeYun HUA ChangCai WEN Wu CHI ShunLiang YOU QingYu YU Dan | 2013 | Chinese Science Bulletin2013，58，4： | 8 |
| 3 | Indications of stratospheric anomalies in the freezing rain and snow disaster in South China,2008显示文摘NCEP/NCAR reanalysis data were used to characterize stratospheric temperature and water-vapor anomalies before and after the freezing rain and snow disaster of South China in 2008,and the influence of stratospheric circulation anomalies on the troposphere.Stratospheric temperature and water-vapor anomalies provided good leading indicators of this weather event.The period from December 1st 2007 to February 28th 2008 was divided into 18 pentads.During the 6th pentad,temperature decreased significantly at 10 hPa in the near-polar stratospheric region,and the decreasing trend strengthened and extended downward and southward to middle and lower latitudes.During the 14th-18th pentads,the temperature decrease reached its maximum and extended to 30°N.This coincided with the widespread freezing rain and snow event.By the end of January 2008,the temperature decrease ended in the near-polar stratospheric region,but continued in the mid-latitude area of the troposphere as the freezing rain and snow weather persisted.Similar to the temperature variations,positive anomalies of relative humidity in the stratospheric near-polar region also strengthened and extended downward and southward,coinciding with the freezing rain and snow event.Along with the significant relationship between the freezing rain and snow disaster and stratospheric circulation anomalies,the stratospheric polar vortex changed its shape in late December,intensifying and spreading downward from the top of the stratosphere and southward to the Asian continent,resulting in a deepening of the East Asian Trough and a strengthening of meridional circulation.Before the occurrence of the freezing rain and snow event,temperature and vapor increases in the stratosphere transferred downward to the troposphere,along with a stratospheric flow in the near-polar region southward to lower latitudes. | CHEN QuanLiang LI Zhan FAN GuangZhou ZHU KeYun ZHANG Wen ZHU HongQin | 2011 | Science China Earth Sciences2011，54，8： | 5 |
| 4 | A design study on the CSNS LEBT pre-chopper显示文摘The China Spallation Neutron Source (CSNS) front end incorporates a pre-chopper in the Low Energy Beam Transport line (LEBT) that will remove a 530 ns section of beam at approximately 1 MHz rate, which is the RF frequency of the ring at injection. It's one of the most critical devices for properly controlling the injecting beam loss. Physical designing of the pre-chopper is carried out, and the RFQ itself is used as the beam dump of the chopper system. In order to examine the reliability of the pre-chopper design, the beam study of a similar chopper system is successfully performed. The results of physical design and experiments are presented. | LIU HuaChang OUYANG HuaFu PENG Jun HUANG Tao GONG KeYun XU TaoGuang FU ShiNian | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，S2： | 3 |
| 5 | The R&D status of DTL for CSNS显示文摘The China Spallation Neutron Source (CSNS) is a spallation neutron research facility being built at Dongguan in Guangdong Province. The 324 MHz Alvarez-type Drift Tube Linac will be used to accelerate the H- ion beam from 3 to 80.0 MeV with peak current 15 mA. The R&D of a prototype structure at the low energy section of DTL is taking place at IHEP. The first unit tank ~2.8 m in length and 28 drift tubes containing electromagnetic quadrupoles are developed. The SAKAE coils are applied in the fabrication of the electromagnetic quadrupoles. This paper introduces the R&D status of the tank and 28 drift tubes. The fabrication process and measurement results of the electromagnetic quadrupoles of special interest are also presented. | YIN XueJun GONG KeYun PENG Jun SONG Hong XIAO YongChuan LI AHong LIU Lei FU ShiNian | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，S2： | 3 |
| 6 | Control system for cryogenic permanent magnet undulator(CPMU)of high energy photon source(HEPS)显示文摘Background High energy photon source(HEPS)is the fourth-generation light source,which uses a large number of highperformance insertion devices to generate synchrotron radiation.The control system is an important part of the insertion device(ID).Purpose Cryogenic permanent magnet undulator(CPMU)is one kind of IDs that works in liquid nitrogen temperature and ultra-high vacuum environment,and its control system is more difficult and complex than in-air ID.The design of the control system for CPMU will be introduced in detail.Method The sub-systems include high-precision magnetic gap control,safety protection,measurement and compensation of magnetic gap at cryogenic temperature and cryogenic temperature monitoring.Mature,reliable,stable technical schemes are designed to meet the technical specifications of sub-systems.Results The experiment results show that the magnetic gap motion accuracy can be controlled within 0.2–0.3μm under the step size of 1μm.The safety protection system has been tested in turn,and the predetermined protection can be achieved.The average value of magnetic gap cold contraction is 1.512 mm measured by optical micrometer,and the compensation is realized by software.The average temperature of the main magnet structure measured by the temperature sensors is 81.0 K,and the temperature gradient is 0.7 K/m.The temperature monitoring is reliable and stable.Conclusion The CPMU control system which is based on EPICS has been successfully applied to the CPMU prototype,and the test results have met the design specifications. | Shutao Zhao Jianshe Cao Huihua Lu Xiaoyu Li Shuchen Sun Yajun Sun Xiangzhen Zhang Lei Zhang Yuhui Li Zhiqiang Li Wan Chen Lingling Gong Qing Guo Keyun Gong Yongsheng Huang Yanwei Yang Yufeng Yang | 2021 | Radiation Detection Technology and Methods2021，5，1： | 2 |
| 7 | City Size,Population Concentration and Productivity: Evidence from China显示文摘This paper investigates the impact of China's city size and urban population concentration on city productivity by developing a distinctive index based on global nighttime light data.Using the panel data of 280 prefecture cities from 2004 to 2013 and employing dynamic system generalized method of moments and panel threshold model regression techniques,our results show that city size has a positive impact on city productivity;therefore,cities in China still have the potential to expand.While moderate urban population concentration can benefit city productivity,excessively concentrated urban population distribution may impede the growth of city productivity.We also find that the level of labor income significantly affects the impacts of urban agglomeration on labor productivity.Therefore,our results imply that city development policies should focus more on how to appropriately allocate economic activities and adjust population distribution in urban areas according to different stages of economic development. | Jie Shen Chunlai Chen Mengyu Yang Keyun Zhang | 2019 | China & World Economy2019，27，1： | 2 |
| 8 | On filters of lattice implication algebras 显示文摘 | XU Yang QIN Keyun | 1993 | J Fuzzy Math1993，1，： | 1 |
| 9 | On the topological properties of fuzzy rough sets显示文摘 | Qin Keyun Pei Zheng | 2005 | Fuzzy sets and systems2005，114，3： | 1 |
| 10 | Generalized rough sets based on reflexive and transitive relations 显示文摘 | QIN Keyun YANG Jilin PEI Zheng | 2008 | Information Sci- ences2008，178，： | 1 |
| 11 | Generalized rough sets based on reflexive and transitive relations显示文摘 | Qin Keyun Yang Jilin Pei Zheng | 2008 | Information Sciences2008，178，21： | 1 |
| 12 | Lattice-valued propositional logic(I)显示文摘 | Xu Yang Qin Keyun | 1993 | Journal of Southwest Jiaotong University1993，1，2： | 1 |
| 13 | On filters of lattice implication algebras 显示文摘 | Xu Yang Qin Keyun | 1993 | Joural of Fuzzy Mathematics1993，，1： | 1 |
| 14 | L-valued propositional logic Lvpl 显示文摘 | Xu Yang Qing Keyun | 1999 | Information Sciences1999，114，： | 1 |
| 15 | Mechanical design of a cryogenic Delta-Knot undulator for high energy photon source显示文摘Introduction A novel type of pure permanent cryogenic Delta–Knot Undulator was developed at IHEP to supply a high flux of full adjustable polarization synchrotron radiation with low on-axis power density.This prototype was an active attempt and early exploration for future APPLE–Knot undulator,which will be used at high energy photon source(HEPS).Materials and methods There are several challenges to develop a cryogenic delta undulator,such as the complicated structure,the influence of large magnetic force,and the magnetic measurement difficulty due to the very small gap.In this paper,the mechanical design for overcoming these difficulties will be presented in detail.Conclusion A special hall measuring system is developed,and the preliminary results agree with the theoretical results.This undulator prototype will provide valuable experience for angle magnetization technology,intricate magnetic attraction structure design,and magnetic field measurement under closed small space. | Shuchen Sun Huihua Lu Xiaoyu Li Xiangzhen Zhang Yanwei Yang Yajun Sun Lei Zhang Yuhui Li Zhiqiang Li Wan Chen Lingling Gong Shutao Zhao Qing Guo Keyun Gong Yongsheng Huang Yufeng Yang | 2021 | Radiation Detection Technology and Methods2021，5，1： | 1 |
| 16 | On semantics of L-valued first order logic Lvfl 显示文摘 | Xu Yang Qing Keyun | 2000 | Int J General systems2000，29，1： | 1 |
| 17 | Ultra LI-ideals in lattice implication algebras and MTL-algebras 显示文摘 | Zhang Xiaohong Qin Keyun Dudek W A | 2007 | Czechoslovak Math J2007，57，132： | 1 |
| 18 | Ul- tra LI-ideals in lattice implication algebras and MTL- algebras 显示文摘 | ZHANG Xiaohong QIN Keyun WIESLAW A | 2007 | Czechoslovak Mathematical Journal2007，57，59： | 1 |
| 19 | Correlation of periodontal diseases with intracranial aneurysm formation:novel predictive indicators显示文摘Background:We investigated whether periodontal diseases,specifically,periodontitis and gingivitis,could be risk factors of the incidence of intracranial aneurysms(IAs).Methods:We performed a case–control study to compare the differences in the periodontal disease parameters of 281 cases that were divided into the IAs group and non-IAs group.All cases underwent complete radiographic examination for IAs and examination for periodontal health.Results:Comparing with those in the non-IAs group,the cases in the IAs group were older(53.95±8.56 vs 47.79±12.33,p<0.001)and had a higher incidence of hypertension(76 vs 34,p=0.006).Univariate logistic regression analysis revealed that age(>50 years)and hypertension were predictive risk factors of aneurysm formation(odds ratio[OR]1.047,95%confidence interval[95%CI]1.022–1.073,p<0.001 and OR 2.047,95%CI 1.232–3.401,p=0.006).In addition,univariate and multivariate logistic regression analyses showed that the parameters of periodontal diseases,including gingival index,plaque index,clinical attachment loss,and alveolar bone loss,were significantly associated with the occurrence of IAs(all p<0.05).For further statistical investigation,the parameters of periodontal diseases were divided into four layers based on the quartered data.Poorer periodontal health condition(especially gingival index>1.1 and plaque index>1.5)had the correlation with IAs formation(p=0.007 and p<0.001).Conclusion:Severe gingivitis or periodontitis,combining with hypertension,is significantly associated with the incidence of IAs. | Keyun Liu Jia Sun Lingling Shao Hongwei He Qinglin Liu Youxiang Li Huijian Ge | 2021 | Chinese Neurosurgical Journal2021，7，3： | 1 |
| 20 | ILI-ideals and prime LI-ideals in lattice implication algebras显示文摘 | LIU Yonglin LIU Anyang QIN Keyun | 2003 | Information Sci- ences2003，155，： | 1 |
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