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Induced ion-channel instability

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Nuclear Science and Techniques 2005年第2期16卷 65-69页

作者： daizhi-Min ShanghaiInstituteofAppliedPhysics theChineseAcademyofSciencesShanghai201800

In this paper, a new mechanism of electromagnetic instability, the induced ion-channel instability, is stud- ied. It is based on the transverse driven betatron oscillation of relativistic electron beam induced by an additional magnetic undulator with a period close to the betatron wavelength in an ion channel. As its amplitude is sensitive to the electron beam energy, the driven betatron oscillation may determine electron beam grouping in the ponderomotive potential by selecting the undulator strength and period, and it provides a new mechanism of electron bunching, re- sulting in electromagnetic instability. Under proper condition, a new free-electron laser based on this mechanism may be realized.

关键词：自由电子激光器离子轨道不稳定性从动共振电子感应加速器

Study of orbit stability in the SSRF storage ring

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Nuclear Science and Techniques 2003年第3期14卷 157-160页

作者： daizhi-Min LIUGui-Min HUANGNan ShanghaiInstituteofNuclearResearch theChineseAcademyofSciencesShanghai201800 InstituteofHighEnergyPhysics theChineseAcademyofSciences.Beijing100039

In this paper, analysis of the beam orbit stability and conceptual study of the dynamic orbit feedback inthe SSRF storage ring are presented. It is shown that beam orbit position movement at the photon source points issmaller than the orbit stability requirements in horizontal plane, but exceeds the orbit stability requirements in verticalplane. A dynamic global orbit feedback system, which consists of 38 high-bandwidth air-coil correctors and 40high-precise BPMs, is proposed to suppress the vertical beam orbit position movement. Numerical simulations showthat this dynamic orbit feedback system can stabilize the vertical beam orbit position movement in the frequencyrange up to 100 Hz.

关键词：轨道稳定性 SSRF 储存环反馈系统同步加速器辐射装置

Sepsis biomarkers： an omics perspective

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Frontiers of Medicine 2014年第1期8卷 58-67页

作者： Xiao Liu Hui Ren daizhi Peng Institute of Burn Research Southwest Hospital State Key Laboratory of Trauma Burns and Combined Injury Third Military Medical University Chongqing 400038 China School of Nursing Third Military Medical University Chongqing 400038 China

Sepsis is a common cause of death in hospitalized patients worldwide. The early detection of sepsis remains a great challenge for clinicians, and delayed diagnosis frequently undermines treatment efforts, thereby contributing to high mortality. Omics technologies allow high-throughput screening of sepsis biomarkers. This review describes currently available and novel sepsis biomarkers in the context of genomics, transcriptomics, proteomics, and metabolomics. The combination of these technologies can help refine the diagnosis of sepsis. This review paper serves as a reference for future studies that employ an integrated, multi-omics approach to disease identification.

关键词： sepsis biomarker genomics transcriptomics proteomics metabolomics

Design of the SSRF storage ring magnet lattice

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Nuclear Science and Techniques 2003年第2期14卷 89-92页

作者： daizhi-Min LIUGui-Min HUANGNan ShanghaiInstituteofNuclearResearch theChineseAcademyofSciencesShanghai201800 InstituteofHighEnergyPhysics theChineseAcademyofSciencesBeijing100039

The Shanghai Synchrotron Radiation Facility (SSRF) is a proposed 3rd generation light source with 3.5 GeV in energy. It is composed of 20 DBA cells resulting in a ring that is about 10 nm(rad in emittance and 396 m in circumference, and provides 10 straight sections of 7.24 m and other 10 straight sections of 5.0 m for the inclusion of insertion devices, injection components and RF cavities. The lattice has high flexibility, and the tunes and beta functions can be easily adjusted within a wide range to meet the requirements for different operation modes, including high beta mode and hybrid beta mode with and/or without dispersion in straight sections. In this paper, the results of linear optics design and dynamic aperture study are presented.

关键词：电子储存环同步加速器辐射装置 SSRF 上海光源磁格

Characteristics of coherent diffraction terahertz radiation at SDUV-FEL

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Nuclear Science and Techniques 2005年第2期16卷 70-75页

作者： LIUAi-Qin LIUGui-Min daizhi-Min ShanghaiInstituteofAppliedPhysics theChineseAcademyofSciencesShanghai201800

Coherent diffraction radiation (CDR), generated by relativistic femtosecond electron bunches passing through an aperture in a metallic foil, is becoming widely used as a high brightness, coherent, polarized, and broad- band terahertz radiation source. It is one of the most promising technique for non-destructive beam diagnostics in ac- celerators. In this paper, how to produce CDR is studied by utilizing femtosecond electron bunches at wavelengths equal to or longer than the bunch length with the aperture size at the condition of a≤γλ/(2π), which is provided by Shanghai Deep Ultraviolet-Free Electron Laser (SDUV-FEL) facility. General characteristics of CDR at SDUV-FEL are analyzed and numerically calculated. The results show that the radiance of this radiation within the frequency range from 0.2 up to 5 terahertz greatly exceeds that available from conventional black body radiation or synchrotron radiation.

关键词：一致衍射辐射太赫辐射源 SDUV-FEL 金属薄片同步加速器

A field investigation into the characteristics and formation mechanisms of particles during the operation of laser printers and photocopiers

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Journal of Environmental Sciences 2023年第4期126卷 697-707页

作者： Qiang Wang daizhi an Zhengquan Yuan Rubao Sun Wei Lu Lili Wang Chinese People’s Liberation Army Center for Disease Control and Prevention Beijing 100071China

Indoor particle release from toner printing equipment (TPE) is a major health concern and has received wide *** this study,nine printing centers were randomly selected and three working phases were simulated,namely,non-working,normal printing/copying,and heavy printing/*** dynamics of the ozone (O_(3)),volatile organic compound (VOC),and particle emissions from TPE were determined by portable *** showed that particles,VOCs,and O_(3)were indeed discharged,and particles and VOCs concentrations remained at high *** them,44%of the rooms represented high-level particle ***-sized particles,especially nanoparticles,were positively correlated with VOCs,but were inversely proportional to the O_(3)*** elements,Ca,Al,Mg and Ni,were usually present in nanoparticles because of the discharge of ***,Al,K,Ni and Pb were found in the submicrometer-sized particles and were consistent with the toner *** potential particle precursors were identified,which suggested that styrene was the most likely secondary organic aerosol (SOA) ***,the use of the toner formulation and the discharge of paper attribute to the TPE-emitted particles,in which styrene is a specific monitoring indicator for the formation of SOA.

关键词： Toner-based printing equipment Particulate matter Ozone Volatile organic compound Secondary organic aerosol precursor

Improve Spatiotemporal Kriging with Magnitude and Direction Information in Variogram Construction

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Chinese Journal of Electronics 2016年第3期25卷 527-532页

作者： CHEN Dingxin LIU daizhi LI Yihong MENG Liang YANG Xiaojun PLA Rocket Force Engineering University

Magnitude information and direction information are utilized to improve the spatiotemporal Kriging method in the step of variogram construction. Basement of spatiotemporal variogram construction is to calculate vector distance between time slices, and space slices. Criterions of vector distance to spatiotemporal variogram construction is discussed, and a new vector distance model considering both magnitude and direction information is proposed. Case study using data from National Network of Geomagnetic Observatories of China is carried out for cross validation. Results illustrate that the proposed model performs better in analyzing in the statistics of Mean absolute error(MAE) and Mean square error(MSE). The accuracy of spatiotemporal Kriging interpolation is improved with such an operation in vector distance.

关键词： Spatiotemporal Kriging Variogram Vector distance criterions Vector directional filters

Study on Traditional Chinese Medicine theory of lung being connected with large intestine

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Journal of Traditional Chinese Medicine 2012年第3期32卷 482-487页

作者： Ping Liu Ping Wang daizhi Tian Junfeng Liu Gang Chen Songlin Li Key Laboratory of Traditional ChineseMedicine Resource and Compound Prescription Hubei Col-lege of Traditional Chinese MedicineMinistry of EducationHubeiWuhan 430065China

OBJECTIVE:The theory of lung being connected with large intestine,which is a major topic in Traditional Chinese Medicine(TCM),has guided clinical practice for thousands of years in ***:In this study,we analyzed the history,main contents,clinical application,and material basis of the theory,to attempt to improve the potential clinical significance of "lung being connected with large intestine" in ***:The lung being connected with large intestine was first described in "Huang Di Nei Jing",and formed one of the basic theories of *** thousands of years,the majority of TCM practitioners explored this theory continuously,leading to its development and use as an important theory in the guidance of TCM clinics In the last decade,researchers in the field of integrated TCM and Western medicine have studied clinical applications and biomedical mechanisms with experimental methods to explore the implications of the ***:With the further development of science and technology,research concerning the theory of lung being connected with large intestine will be greatly stimulated and contribute to the modernization of TCM.

关键词： Lung being connected with large intestine Traditional Chinese Medicine Clinical application

Hydrothermal Synthesis and Crystal Structure of a Microporous Gallophosphate with 12-Membered Ring Channels:Ga_9(PO_4)_(12)(H_3TREN)(H_2TREN)_3·xH_2O

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Chemical Research in Chinese Universities 2004年第1期20卷 24-28页

作者： CHENXiao-bo LIYi LIGuang-hua daizhi-min FUWen-sheng SHIZhan ZHANGDong XUYao-hua FENGShou-hua StateKeyLaboratoryofInorganicSynthesisandPreparativeChemistry CollegeofChemistryJilinUniversityChangchun130023P.R.China

An open-framework gallophosphate, Ga_9(PO_4)_ 12[(H_3TREN)(H_2TREN)_3]·xH_2O was hydrothermally synthesized at 453 K with tris(2-aminoethyl) amine(TREN) as the organic template and characterized by single-crystal X-ray diffraction. Ga_9(PO_4)_ 12[(H_3TREN)(H_2TREN)_3]·xH_2O crystallized in a cubic space group I43m, with a=1.68552(3) nm and Z=2. The structure contains 12-membered ring channels and supercages of 1.434 nm in diameter, and is an analogue of Al_9(PO_4)_ 12(C_ 24H_ 91N_ 16)·17H_2O. Template-TREN in the supercage was different from triethylenetetraamine(TETA) used in the initial reaction mixture due to the construction transformation. The TETAs transformed into the TRENs due to the low interaction energy between the template and framework. We verified it via energy calculation and liquid state NMR.

关键词： Microporous Gallophosphate Hydrothermal Energy calculation