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193nm光分解CS自由基的LIF光谱研究

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应用激光 1989年第1期9卷 1-5,29页

作者：邱明新 w.m.jackson 上海市激光技术研究所美国加州大学Davis分校化学系

本文研究了 CS 的 LIF 光谱、得到了不同参量下的振转态的荧光光谱。理论分析表明 CS 的主要分解渠道是产生 X^1D)态的过程。分解后 CS 的自由基的振动态集居数,在低υ值大体是同一数量级,而υ≥4的集居数,随υ值增加指数地减少。同时,... 详细信息

本文研究了 CS 的 LIF 光谱、得到了不同参量下的振转态的荧光光谱。理论分析表明 CS 的主要分解渠道是产生 X^1D)态的过程。分解后 CS 的自由基的振动态集居数,在低υ值大体是同一数量级,而υ≥4的集居数,随υ值增加指数地减少。同时,得到一些相应的截面和有关常数。

关键词： CS LIF光谱自由基 193nm光

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氨基氰分子在193nm的光离解动力学

物理学报 1987年第6期 691-697页

作者：解笑湘,I.A.mcLaren,J.B.Halpern,w.m.jackson 中国科学院安徽光学精密机械研究所美国Howard大学化学系美国Howard大学化学系美国加州大学Davis分校化学系

本文研究了氨基氰分子（H2NCN）的光离解动力学。利用激光诱导荧光技术（LIF）检测了这一分子在193nm下光解所生成的CN（X2Σ+）基,在激光能量为0.35mJ/脉冲的条件下,CN（X）基的LIF信号十分弱,其0—0带的转动温度为1590±90K;当激光能... 详细信息

本文研究了氨基氰分子（H2NCN）的光离解动力学。利用激光诱导荧光技术（LIF）检测了这一分子在193nm下光解所生成的CN（X2Σ+）基,在激光能量为0.35mJ/脉冲的条件下,CN（X）基的LIF信号十分弱,其0—0带的转动温度为1590±90K;当激光能量较高时,LIF信号明显增加,并观察到=2能级上的布居。在50℃的温度下,本实验测量了氨基氰分子的紫外吸收光谱,在193nm其吸收截面小于2.4×10-19cm2。二次光解机理可用来解释本实验的结果。

关键词：氨基氰氰化合物 CN LIF nm 准分子激光分子吸收截面光子玻色子动力学荧光池原子紫外吸收光谱反应式

C4H4N2、C4H2N2和C6N4分子在193nm处的激光光离解——CN（X2Σ+）基的转动能量分布

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中国激光 1987年第8期 480-486页

作者：解笑湘,I.A.mcLaren,J.B.Halpern,w.m.jackson 中国科学院安徽光机所 Howard大学 Howard大学加州大学Davis分校

本文描述了C4H4N2、C4H2N2和C6N4分子的紫外光离解过程。利用激光诱导荧光技术（LIF）研究了以上分子被193nm激光光解后所产生的CN（X）基的新生内能态分布。实验中观察到,CN基×2∑+态的0-0带和1-1带的转动分布均具有Boltzman分布的特... 详细信息

本文描述了C4H4N2、C4H2N2和C6N4分子的紫外光离解过程。利用激光诱导荧光技术（LIF）研究了以上分子被193nm激光光解后所产生的CN（X）基的新生内能态分布。实验中观察到,CN基×2∑+态的0-0带和1-1带的转动分布均具有Boltzman分布的特征。CN（X）基υ″=0能级的转动温度分别为1680±40K（C4H4N2）、20004±50K（C4H2N2）和1470±30K（C6N4）,而C4H2N2分子所产生的CN（X）基V″=1能级的转动温度为1150±160K。本文也测量了以上三个分子在气相中的紫外吸收光谱

关键词：紫外吸收光谱气相激光 C4H4N2 C6N4 X~2 C4H2N2 CN 分子 nm

高平动能（1.15eV）CN基的T-V过程的探讨

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物理化学学报 1988年第3期 103-106页

作者：李学初 jackson w.m. 中国科学院大连化学物理研究所美国California大学Davis分校

用193毫微米光解BrCN和ClCN的研究,发现一些很有意义的结果。如在光解BrCN时发现碎片CN X2∑+ v″=0的转动能级高达80以上,它可研究高转动能在传能和反应中的作用。研究中发现一些异常现象;Heaven等在扩散分子束中得到BrCN的光解产物CN... 详细信息

用193毫微米光解BrCN和ClCN的研究,发现一些很有意义的结果。如在光解BrCN时发现碎片CN X2∑+ v″=0的转动能级高达80以上,它可研究高转动能在传能和反应中的作用。研究中发现一些异常现象;Heaven等在扩散分子束中得到BrCN的光解产物CN X2∑+,共中v″=0约占80%,v″=1约占20%;而Halpern等在10-5Torr延迟0.2微秒测得的光解产物,v″=0占94%,v″=1占6%。Heaven给出的谱图上出现很高的P0,0支带头,与Halpern结果比较,明显地发生了转动弛豫,达表明实验中有碰撞弛豫。但为什么v″=1的布居不下降,却反而上升?为了弄清达个问题,我们在不同BrCN压办及不同延迟时间下去探测CN X2∑+,v″的碰撞弛豫。

关键词： CN 碎片 T-V 布居振动能级光解产物

氢原子与激发态二氧化硫分子的反应动力学研究

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中国科学（B辑） 1997年第5期27卷 457-462页

作者：韩克利吕日昌 V.R.morris 林桦 w.m.jackson 中国科学院大连化学物理研究所分子反应动力学国家重点实验室 116023 Dept.of Chemistry Dept.of Chemistry Califon

利用泵浦-探测和时间分辨的红外化学技术研究了H与SO_2的反应.测量了高振动态SO的粒子布居及OH的振动布居.并按照从头计算的结果,构造了模型势能面.在此势能面上,对此体系进行了经典轨迹理论计算.理论结果与实验有比较好的符合.

关键词：氢原子二氧化硫激发态反应动力学

Protocol for the development and validation of a clinical measurement tool for fear of disease progression and recurrence in cardiac patients

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Chronic Diseases and Translational medicine 2024年第3期10卷 195-204页

作者： Sarah T.Clarke michael Le Grande Barbara m.murphy Robert Hester Alun C.jackson melbourne School of Psychological Sciences University of MelbourneParkvilleVictoriaAustralia Australian Centre for Heart Health MelbourneVictoriaAustralia Centre on Behavioral Health University of Hong KongPokfulamHong KongChina

Introduction: One in two cardiac patients fear having another heart event or their heart condition getting worse. Research in other chronic illnesses demonstrates that screening for fear of progression and recurrence is vital for adequately addressing such concerns in clinical care. The current project aims to develop and validate a measure for fear of progression and recurrence in cardiac ***: The Fear of Cardiac Recurrence and Progression Scale (FCRP) will be developed through a multistep process. An initial item pool will be generated through a review of the literature and existing measures and consultation with and feedback from key informants. The item pool will be tested in a sample of over 250 adults who have ever had an acute coronary event, undergone cardiac surgery, or a chronic cardiac condition. Exploratory factor analysis will be used to identify the underlying factors, and Rasch analysis will be used to reduce the number of items. A short form version of the FCRP will be developed for use as a brief screening tool, informed by clinical relevance and Rasch psychometric ***: while many cardiac patients experience fears related to the progression or recurrence of their illness, there remains the need for a validated tool with which these concerns can be identified and measured. It is expected that the design and validation of the FCRP will aid identification of cardiac patients suffering from clinically significant levels of fear of progression and recurrence and facilitate the design of tailored psychological interventions to target these fears.

关键词： anxiety cardiac anxiety cardiac recovery cardiac rehabilitation depression fear of progression fear of recurrence psychological measurement psychosocial screening

modelling dynamic pantograph loads with combined numerical analysis

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Railway Engineering Science 2024年第1期32卷 81-94页

作者： F.F.jackson R.mishra J.m.Rebelo J.Santos P.Antunes J.Pombo H.magalhaes L.wills m.Askill School of Computing and Engineering University of HuddersfieldHuddersfieldUK School of Computing and Engineering Institute of Railway ResearchUniversity of HuddersfieldHuddersfieldUK IDmEC Instituto Superior TecnicoUniversidade de LisboaLisbonPortugal ISEL Instituto Politecnico de LisboaLisbonPortugal Hitachi Rail Newton AycliffeUK wabtec/Brecknell willis ChardUK

Appropriate interaction between pantograph and catenary is imperative for smooth operation of electric *** heights of overhead lines to accommodate level crossings,overbridges,and tunnels pose significant challenges in maintaining consistent current collection performance as the pantograph aerodynamic profile,and thus aerodynamic load changes significantly with operational *** research aims to analyse the global flow characteristics and aerodynamic forces acting on individual components of an HSX pantograph operating in different configurations and orientations,such that the results can be combined with multibody simulations to obtain accurate dynamic insight into contact ***,computational fluid dynamics simulations are used to investigate the pantograph component loads in a representative setting,such as that of the recessed cavity on a Class 800 *** an aerodynamic perspective,this study indicates that the total drag force acting on non-fixed components of the pantograph is larger for the knuckle-leading orientation rather than the knuckle-trailing,although the difference between the two is found to reduce with increasing pantograph *** the aerodynamic loads acting on individual components with multibody tools allows for realistic dynamic insight into the pantograph *** results obtained show how considering aerodynamic forces enhance the realism of the models,leading to behaviour of the pantograph-catenary contact forces closely matching that seen in experimental tests.

关键词： Pantograph-catenary interaction Pantograph aerodynamics Computational fluid dynamics Pantograph loads Current collection performance

Integrated Single-cell multiomic Analysis of HIV Latency Reversal Reveals Novel Regulators of Viral Reactivation

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Genomics, Proteomics & Bioinformatics 2024年第1期22卷 67-88页

作者： manickam Ashokkumar wenwen mei jackson J.Peterson Yuriko Harigaya David m.murdoch David m.margolis Caleb Kornfein Alex Oesterling Zhicheng Guo Cynthia D.Rudin Yuchao Jiang Edward P.Browne Department of medicine University of North Carolina at Chapel HillChapel HillNC 27599USA HIV Cure Center University of North Carolina at Chapel HillChapel HillNC 27599USA Department of Biostatistics University of North Carolina at Chapel HillChapel HillNC 27599USA Department of microbiology and Immunology University of North Carolina at Chapel HillChapel HillNC 27599USA Department of Genetics University of North Carolina at Chapel HillChapel HillNC 27599USA Department of medicine Duke UniversityDurhamNC 27708USA Department of Computer Science Duke UniversityDurhamNC 27708USA Department of Statistics Texas A&M UniversityCollege StationTX 77843USA Department of Biology Texas A&M UniversityCollege StationTX 77843USA Department of Biomedical Engineering Texas A&M UniversityCollege StationTX 77843USA

Despite the success of antiretroviral therapy,human immunodeficiency virus(HIV)cannot be cured because of a reservoir of latently infected cells that evades *** understand the mechanisms of HIV latency,we employed an integrated single-cell RNA sequencing(scRNA-seq)and single-cell assay for transposase-accessible chromatin with sequencing(scATAC-seq)approach to simultaneously profile the transcriptomic and epigenomic characteristics of~125,000 latently infected primary CD4^(+)T cells after reactivation using three different latency reversing *** expressed genes and differentially accessible motifs were used to examine transcriptional pathways and transcription factor(TF)activities across the cell *** identified cellular transcripts and TFs whose expression/activity was correlated with viral reactivation and demonstrated that a machine learning model trained on these data was 75%-79%accurate at predicting viral ***,we validated the role of two candidate HIV-regulating factors,FOXP1 and GATA3,in viral *** data demonstrate the power of integrated multimodal single-cell analysis to uncover novel relationships between host cell factors and HIV latency.

关键词： HIV latency reversal Primary CD4þT cell Single-cell multiomics HIV-regulating factor machine learning

Levels of Polycyclic Aromatic Hydrocarbons (PAHs) in Healthcare waste Incinerators’ Bottom Ash from Five County Hospitals in Kenya

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Journal of Environmental Protection 2024年第3期15卷 318-337页

作者： muriithi jackson Githinji Paul mwangi Njogu Zipporah Nganga mohamed Karama Institute of Tropical medicine and Infectious Diseases (ITROmID) Jomo Kenyatta University of Agriculture and Technology Nairobi Kenya Institute of Energy and Environmental Technology Jomo Kenyatta University of Agriculture and Technology Nairobi Kenya Academic Research and Student Affairs South Eastern Kenya University Kitui Kenya Public Health and Epidemiology Umma University Kajiado Kenya

Health-care waste contains potentially harmful microorganisms and compounds which can infect and affect hospital patients, healthcare workers, the general public and environment. Therefore, management of health care waste requires safe handling, treatment and disposal procedures. while incineration reduces the volume and quantity of waste for final disposal, it leads to the production of fly and bottom ashes laden with toxic incomplete combustion products such as Polycyclic Aromatic Hydrocarbons (PAHs), dioxins, furans and heavy metals. This exposes workers who handle and dispose the bottom ashes, hospital patients, the general public and environment. The goal of this study was to determine the total and individual levels of 16 most prevalent and toxic PAHs. Bottom ash samples were collected from incinerators in five county hospitals in Kenya, namely;moi-Voi, Narok, Kitale, makindu and Isiolo. Bottom ash samples were collected over a period of six months from the five hospitals. The samples were then sieved, homogenised and stored at 4°C in amber coloured glass containers. The PAHs were extracted using 30 ml of a hexane-acetone solvent (1:1) mixture by ultrasonication at room temperature (23°C) for 45 minutes. The PAHs were then analyzed with a GC-mS spectrophotometer model (Shimadzu GCmS-QP2010 SE) connected to a computer work station was used for the PAHs analysis. The GC-mS was equipped with an SGE BPX5 GC capillary column (30 m × 0.25 mm × 0.25 μm) for the separation of compounds. Helium was used as the carrier gas at a flow rate of 15.5 ml/minute and 14.5 psi. 1 μl of the sample was injected at 280°C, split mode (10:1). The oven programming was set for a total runtime of 40 minutes, which included: 100°C (2-minute hold);10°C /min rise to 200°C;7°C /min rise to 249°C;3°C /min rise to 300°C (2-minute hold). The interface temperature was set at 290°C. Analysis was done in Selected Ion monitoring (SIm) mode and the peak areas of each of the PAHs were collected from

关键词： PAHs GC-mS Healthcare wastes Disposal Incinerator Bottom Ash