Medical works and histories provide a general understanding of foreign influence on Chinese medicine,but a variety of miscellaneous texts give a deeper understanding of the details of this interaction.Trade manuals,no...Medical works and histories provide a general understanding of foreign influence on Chinese medicine,but a variety of miscellaneous texts give a deeper understanding of the details of this interaction.Trade manuals,notes on foreign interactions,archeological discoveries,and religious works all fill in important details on the incorporation of foreign medicines and ideas into Chinese medicine.展开更多
930610 The retrospective study on the mortalityof 0-4 years old children in five monitoring vil-lages of Baoying County,Jiangsu Province.JI Ji-ayu(季家鈺).Women & Children Health Center,Baoying County,Baoying,2258...930610 The retrospective study on the mortalityof 0-4 years old children in five monitoring vil-lages of Baoying County,Jiangsu Province.JI Ji-ayu(季家鈺).Women & Children Health Center,Baoying County,Baoying,225800.Chin RuralHealth Serv Administr 1993;13(3):44-45.According to the monitoring plan laid down bythe Department of Women and Children Affairs,Ministry of Public Health,a basal survey on theacute respiratory infection of the children in thewhole county was engaged.The condition of theretrospective study of the mortality of 0-4 yearsold children in 1990 of 5 monitoring villages(Sishui,Zhangshidang,Wangzhi,Chengjiao andXiaji)was reported and analyzed.There were2227 neonatal live births in 1990.The mortalityof the infants in the 5 monitoring villages was展开更多
920754 Injurious effects of TNF-α on viscer-al organs of germ-free rats: a preliminaryreport. SHENG Zhiyong(盛志勇), et al.Postgraduate Med Coll, PLA, 30th Hosp, PLA.Med J Chin PLA 1992; 17(3): 168-170. TNF might be ...920754 Injurious effects of TNF-α on viscer-al organs of germ-free rats: a preliminaryreport. SHENG Zhiyong(盛志勇), et al.Postgraduate Med Coll, PLA, 30th Hosp, PLA.Med J Chin PLA 1992; 17(3): 168-170. TNF might be one of the most importantcytokines in the process of sepsis. The presentstudy is to evaluate its direct effects on differentorgans. For this purpose, germ-free rats展开更多
970395 Screening and genetic analysis of fragile Xsyndrome in Tongling Anhui province of China, SHENYan(沈岩), et al. Basic Med Sci Instit, CAMS &PUMC, Beijing, 100005. Natl Med J China 1997; 77(4): 260-262 Object...970395 Screening and genetic analysis of fragile Xsyndrome in Tongling Anhui province of China, SHENYan(沈岩), et al. Basic Med Sci Instit, CAMS &PUMC, Beijing, 100005. Natl Med J China 1997; 77(4): 260-262 Objective: To investigate the prevalence of fragile展开更多
The thermal gradient is an important factor that causes degradation to the image quality of telescopes. In order to ensure the accurate alignment of the primary focus unit and the primary mirror, the hexapod platform(...The thermal gradient is an important factor that causes degradation to the image quality of telescopes. In order to ensure the accurate alignment of the primary focus unit and the primary mirror, the hexapod platform(as a corrector) is investigated in this paper. First, a ground-based telescope with 2.5 m aperture and 3.5 deg field of view is described. The telescope is under construction, and it is expected to be finished in 2023. Second, the hexapod platform with flexure hinges utilized to adjust the primary focus unit is proposed, which is applied as a corrector.Then, the inverse kinematics of the platform is established and an open-loop control system is built based on it.Finally, the cryogenic performance test for the hexapod platform is performed. The experimental results show that the resolution and repeatability of the translation for the hexapod platform can be achieved at the micrometer level.The resolution and repeatability of the rotation can be achieved at the arc-second level. Therefore, the cryogenic performance of the hexapod platform can meet the optical imaging requirements of the wide-field ground-based telescope. The kinematic analysis and cryogenic performance tests in the paper provide a technical reference for the precise alignment of the primary focus unit and the primary mirror, which can improve the imaging quality of the telescope.展开更多
Leighton Chajnantor Telescope(LCT), i.e., the former Caltech Submillimeter Observatory telescope, will be refurbished at the new site in Chajnantor Plateau, Chile in 2023. The environment of LCT will change significan...Leighton Chajnantor Telescope(LCT), i.e., the former Caltech Submillimeter Observatory telescope, will be refurbished at the new site in Chajnantor Plateau, Chile in 2023. The environment of LCT will change significantly after its relocation, and the telescope will be exposed to large wind disturbances directly because its enclosure will be completely open during observation. The wind disturbance is expected to be a challenge for LCT's pointing control since the existing control method cannot reject this disturbance very well. Therefore, it is very necessary to develop a new pointing control method with good capability of disturbance rejection. In this research, a disturbance observer—based composite position controller(DOB-CPC) is designed, in which an H∞feedback controller is employed to compress the disturbance, and a feedforward linear quadratic regulator is employed to compensate the disturbance precisely based on the estimated disturbance signal. Moreover, a controller switching policy is adopted, which applies the proportional controller to the transient process to achieve a quick response and applies the DOB-CPC to the steady state to achieve a small position error. Numerical experiments are conducted to verify the good performance of the proposed pointing controller(i.e., DOB-CPC) for rejecting the disturbance acting on LCT.展开更多
Cross-matching is a key technique to achieve fusion of multi-band astronomical catalogs. Due to different equipment such as various astronomical telescopes, the existence of measurement errors, and proper motions of t...Cross-matching is a key technique to achieve fusion of multi-band astronomical catalogs. Due to different equipment such as various astronomical telescopes, the existence of measurement errors, and proper motions of the celestial bodies, the same celestial object will have different positions in different catalogs, making it difficult to integrate multi-band or full-band astronomical data. In this study, we propose an online cross-matching method based on pseudo-spherical indexing techniques and develop a service combining with high performance computing system(Taurus) to improve cross-matching efficiency, which is designed for the Data Center of Xinjiang Astronomical Observatory. Specifically, we use Quad Tree Cube to divide the spherical blocks of the celestial object and map the 2D space composed of R.A. and decl. to 1D space and achieve correspondence between real celestial objects and spherical patches. Finally, we verify the performance of the service using Gaia 3 and PPMXL catalogs. Meanwhile, we send the matching results to VO tools-Topcat and Aladin respectively to get visual results. The experimental results show that the service effectively solves the speed bottleneck problem of crossmatching caused by frequent I/O, and significantly improves the retrieval and matching speed of massive astronomical data.展开更多
To address the problem of real-time processing of ultra-wide bandwidth pulsar baseband data,we designed and implemented a pulsar baseband data processing algorithm(PSRDP)based on GPU parallel computing technology.PSRD...To address the problem of real-time processing of ultra-wide bandwidth pulsar baseband data,we designed and implemented a pulsar baseband data processing algorithm(PSRDP)based on GPU parallel computing technology.PSRDP can perform operations such as baseband data unpacking,channel separation,coherent dedispersion,Stokes detection,phase and folding period prediction,and folding integration in GPU clusters.We tested the algorithm using the J0437-4715 pulsar baseband data generated by the CASPSR and Medusa backends of the Parkes,and the J0332+5434 pulsar baseband data generated by the self-developed backend of the Nan Shan Radio Telescope.We obtained the pulse profiles of each baseband data.Through experimental analysis,we have found that the pulse profiles generated by the PSRDP algorithm in this paper are essentially consistent with the processing results of Digital Signal Processing Software for Pulsar Astronomy(DSPSR),which verified the effectiveness of the PSRDP algorithm.Furthermore,using the same baseband data,we compared the processing speed of PSRDP with DSPSR,and the results showed that PSRDP was not slower than DSPSR in terms of speed.The theoretical and technical experience gained from the PSRDP algorithm research in this article lays a technical foundation for the real-time processing of QTT(Qi Tai radio Telescope)ultra-wide bandwidth pulsar baseband data.展开更多
Leighton Chajnantor Telescope(LCT)will be moved from the summit of Maunakea,Hawaii to Chajnantor Plateau,Chile and be refurbished there.Strong wind disturbance at the new site will bring great challenges to the servo ...Leighton Chajnantor Telescope(LCT)will be moved from the summit of Maunakea,Hawaii to Chajnantor Plateau,Chile and be refurbished there.Strong wind disturbance at the new site will bring great challenges to the servo control of LCT.It is necessary and important to develop a simulation platform that behaves as close as possible to the real telescope for testing the performance of the designed servo controller.In this paper,a collaborative simulation platform of LCT based on Adams and Matlab/Simulink is constructed.On this platform,the mechanical structure model of LCT can be integrated with its control system model such that a collaborative simulation of the mechanical structure and the control system of LCT can be conducted.The mechanical structure model of LCT,which contains both rigid body models(i.e.,the mount)and flexible body models(i.e.,the primary reflector),is developed by using Adams.The servo system model and the wind disturbance model are constructed by using Matlab/Simulink.By conducting collaborative simulation,the performances of the servo controller based on the rigid body model and the rigid-flexible coupling model of LCT are compared.The comparison shows that the controller designed based on the rigid body model does not perform well when it is employed to control the rigid-flexible coupling model of LCT.However,by readjusting parameters of the servo controller,its performance can be further improved when applied to the rigid-flexible coupling model.Therefore,an LCT model of integrated mechanical structure and control systems is very helpful for analyzing its performance more accurately and designing a better servo controller.展开更多
文摘Medical works and histories provide a general understanding of foreign influence on Chinese medicine,but a variety of miscellaneous texts give a deeper understanding of the details of this interaction.Trade manuals,notes on foreign interactions,archeological discoveries,and religious works all fill in important details on the incorporation of foreign medicines and ideas into Chinese medicine.
文摘930610 The retrospective study on the mortalityof 0-4 years old children in five monitoring vil-lages of Baoying County,Jiangsu Province.JI Ji-ayu(季家鈺).Women & Children Health Center,Baoying County,Baoying,225800.Chin RuralHealth Serv Administr 1993;13(3):44-45.According to the monitoring plan laid down bythe Department of Women and Children Affairs,Ministry of Public Health,a basal survey on theacute respiratory infection of the children in thewhole county was engaged.The condition of theretrospective study of the mortality of 0-4 yearsold children in 1990 of 5 monitoring villages(Sishui,Zhangshidang,Wangzhi,Chengjiao andXiaji)was reported and analyzed.There were2227 neonatal live births in 1990.The mortalityof the infants in the 5 monitoring villages was
文摘920754 Injurious effects of TNF-α on viscer-al organs of germ-free rats: a preliminaryreport. SHENG Zhiyong(盛志勇), et al.Postgraduate Med Coll, PLA, 30th Hosp, PLA.Med J Chin PLA 1992; 17(3): 168-170. TNF might be one of the most importantcytokines in the process of sepsis. The presentstudy is to evaluate its direct effects on differentorgans. For this purpose, germ-free rats
文摘970395 Screening and genetic analysis of fragile Xsyndrome in Tongling Anhui province of China, SHENYan(沈岩), et al. Basic Med Sci Instit, CAMS &PUMC, Beijing, 100005. Natl Med J China 1997; 77(4): 260-262 Objective: To investigate the prevalence of fragile
基金supported by the Jilin Scientific and Technological Development Program (No.20220204116YY)the National Natural Science Foundation of China(No.62235018 and No.12133009)。
文摘The thermal gradient is an important factor that causes degradation to the image quality of telescopes. In order to ensure the accurate alignment of the primary focus unit and the primary mirror, the hexapod platform(as a corrector) is investigated in this paper. First, a ground-based telescope with 2.5 m aperture and 3.5 deg field of view is described. The telescope is under construction, and it is expected to be finished in 2023. Second, the hexapod platform with flexure hinges utilized to adjust the primary focus unit is proposed, which is applied as a corrector.Then, the inverse kinematics of the platform is established and an open-loop control system is built based on it.Finally, the cryogenic performance test for the hexapod platform is performed. The experimental results show that the resolution and repeatability of the translation for the hexapod platform can be achieved at the micrometer level.The resolution and repeatability of the rotation can be achieved at the arc-second level. Therefore, the cryogenic performance of the hexapod platform can meet the optical imaging requirements of the wide-field ground-based telescope. The kinematic analysis and cryogenic performance tests in the paper provide a technical reference for the precise alignment of the primary focus unit and the primary mirror, which can improve the imaging quality of the telescope.
文摘Leighton Chajnantor Telescope(LCT), i.e., the former Caltech Submillimeter Observatory telescope, will be refurbished at the new site in Chajnantor Plateau, Chile in 2023. The environment of LCT will change significantly after its relocation, and the telescope will be exposed to large wind disturbances directly because its enclosure will be completely open during observation. The wind disturbance is expected to be a challenge for LCT's pointing control since the existing control method cannot reject this disturbance very well. Therefore, it is very necessary to develop a new pointing control method with good capability of disturbance rejection. In this research, a disturbance observer—based composite position controller(DOB-CPC) is designed, in which an H∞feedback controller is employed to compress the disturbance, and a feedforward linear quadratic regulator is employed to compensate the disturbance precisely based on the estimated disturbance signal. Moreover, a controller switching policy is adopted, which applies the proportional controller to the transient process to achieve a quick response and applies the DOB-CPC to the steady state to achieve a small position error. Numerical experiments are conducted to verify the good performance of the proposed pointing controller(i.e., DOB-CPC) for rejecting the disturbance acting on LCT.
基金supported by the National Key R&D Program of China (Nos. 2022YFF0711502 and 2021YFC2203502)the National Natural Science Foundation of China (NSFC)(12173077 and 12003062)+6 种基金the Tianshan Innovation Team Plan of Xinjiang Uygur Autonomous Region (2022D14020)the Tianshan Talent Project of Xinjiang Uygur Autonomous Region(2022TSYCCX0095)the Scientific Instrument Developing Project of the Chinese Academy of Sciences (grant No. PTYQ2022YZZD01)China National Astronomical Data Center (NADC)the Operation,Maintenance and Upgrading Fund for Astronomical Telescopes and Facility Instruments,budgeted from the Ministry of Finance of China (MOF)and administrated by the Chinese Academy of Sciences (CAS)Natural Science Foundation of Xinjiang Uygur Autonomous Region (2022D01A360)supported by Astronomical Big Data Joint Research Center,co-founded by National Astronomical Observatories,Chinese Academy of Sciences。
文摘Cross-matching is a key technique to achieve fusion of multi-band astronomical catalogs. Due to different equipment such as various astronomical telescopes, the existence of measurement errors, and proper motions of the celestial bodies, the same celestial object will have different positions in different catalogs, making it difficult to integrate multi-band or full-band astronomical data. In this study, we propose an online cross-matching method based on pseudo-spherical indexing techniques and develop a service combining with high performance computing system(Taurus) to improve cross-matching efficiency, which is designed for the Data Center of Xinjiang Astronomical Observatory. Specifically, we use Quad Tree Cube to divide the spherical blocks of the celestial object and map the 2D space composed of R.A. and decl. to 1D space and achieve correspondence between real celestial objects and spherical patches. Finally, we verify the performance of the service using Gaia 3 and PPMXL catalogs. Meanwhile, we send the matching results to VO tools-Topcat and Aladin respectively to get visual results. The experimental results show that the service effectively solves the speed bottleneck problem of crossmatching caused by frequent I/O, and significantly improves the retrieval and matching speed of massive astronomical data.
基金supported by the National Key R&D Program of China Nos.2021YFC2203502 and 2022YFF0711502the National Natural Science Foundation of China(NSFC)(12173077 and 12003062)+5 种基金the Tianshan Innovation Team Plan of Xinjiang Uygur Autonomous Region(2022D14020)the Tianshan Talent Project of Xinjiang Uygur Autonomous Region(2022TSYCCX0095)the Scientific Instrument Developing Project of the Chinese Academy of Sciences,grant No.PTYQ2022YZZD01China National Astronomical Data Center(NADC)the Operation,Maintenance and Upgrading Fund for Astronomical Telescopes and Facility Instruments,budgeted from the Ministry of Finance of China(MOF)and administrated by the Chinese Academy of Sciences(CAS)Natural Science Foundation of Xinjiang Uygur Autonomous Region(2022D01A360)。
文摘To address the problem of real-time processing of ultra-wide bandwidth pulsar baseband data,we designed and implemented a pulsar baseband data processing algorithm(PSRDP)based on GPU parallel computing technology.PSRDP can perform operations such as baseband data unpacking,channel separation,coherent dedispersion,Stokes detection,phase and folding period prediction,and folding integration in GPU clusters.We tested the algorithm using the J0437-4715 pulsar baseband data generated by the CASPSR and Medusa backends of the Parkes,and the J0332+5434 pulsar baseband data generated by the self-developed backend of the Nan Shan Radio Telescope.We obtained the pulse profiles of each baseband data.Through experimental analysis,we have found that the pulse profiles generated by the PSRDP algorithm in this paper are essentially consistent with the processing results of Digital Signal Processing Software for Pulsar Astronomy(DSPSR),which verified the effectiveness of the PSRDP algorithm.Furthermore,using the same baseband data,we compared the processing speed of PSRDP with DSPSR,and the results showed that PSRDP was not slower than DSPSR in terms of speed.The theoretical and technical experience gained from the PSRDP algorithm research in this article lays a technical foundation for the real-time processing of QTT(Qi Tai radio Telescope)ultra-wide bandwidth pulsar baseband data.
文摘Leighton Chajnantor Telescope(LCT)will be moved from the summit of Maunakea,Hawaii to Chajnantor Plateau,Chile and be refurbished there.Strong wind disturbance at the new site will bring great challenges to the servo control of LCT.It is necessary and important to develop a simulation platform that behaves as close as possible to the real telescope for testing the performance of the designed servo controller.In this paper,a collaborative simulation platform of LCT based on Adams and Matlab/Simulink is constructed.On this platform,the mechanical structure model of LCT can be integrated with its control system model such that a collaborative simulation of the mechanical structure and the control system of LCT can be conducted.The mechanical structure model of LCT,which contains both rigid body models(i.e.,the mount)and flexible body models(i.e.,the primary reflector),is developed by using Adams.The servo system model and the wind disturbance model are constructed by using Matlab/Simulink.By conducting collaborative simulation,the performances of the servo controller based on the rigid body model and the rigid-flexible coupling model of LCT are compared.The comparison shows that the controller designed based on the rigid body model does not perform well when it is employed to control the rigid-flexible coupling model of LCT.However,by readjusting parameters of the servo controller,its performance can be further improved when applied to the rigid-flexible coupling model.Therefore,an LCT model of integrated mechanical structure and control systems is very helpful for analyzing its performance more accurately and designing a better servo controller.
