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Model of the Crustal Magnetic Field in the Martian Aurora Zone

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Chinese Physics Letters 2011年第11期28卷 286-288页

作者： tONG Dong-Sheng CHEN chu-Xin School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026

It is well known that aurorae are prominent on planets with a global magnetic field and occur where open magnetic field lines *** UV spectrometer used for investigating the characteristics of the atmosphere of Mars(SPICAM)on board the Mars Express made the first observation of auroral-type emission in the cusp region of the strong crustal magnetic field on Mars and found that the arc of the Martian aurora zone is very narrow in width,which obviously differs from that of other *** on the observation,we put forward a model of a crustal magnetic field on the Martian aurora zone through the morphology of Martian *** the model,equivalent currents are proposed;the topology and magnitude of the magnetic field generated by these equivalent currents are consistent with that of the crustal magnetic field in the Martian aurora *** morphology of the Martian aurora zone generated through the model matches well with the observations made by the Mars Express orbiter.

关键词： zone crustal currents

Modeling of a Planar Nine-way Metamaterial Power Divider/Combiner

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Journal of Electronic Science and technology 2015年第2期13卷 158-162页

作者： wei-Chiang Lee tah-Hsiung chu Department of Electrical Engineering National Taiwan University

Analysis of the scattering parameters（S-parameters） of planar N-way metamaterial power dividers/combiners mostly uses commercial microwave circuit simulators due to the large circuit size involved. this paper presents an efficient circuit modeling approach, which is based on the multi-input and multi-output transmission matrix（t-matrix） method, to analyze the S-parameter of a planar nine-way metamaterial power-divider/combiner structure. S-parameter computation results are shown in good agreement with the simulation results by using the Agilent advanced design system（ADS） and measurement results. the computation time of an N-way metamaterial power divider/combiner with N=5, 9, 13, and 17 using t-matrix method is also compared with those of ADS and AwR Microwave Office（MwO） to demonstrate its computational efficiency.

关键词： planar microwave sparse matrices dividing mostly decomposed properly combine acquire

tumor angiogenesis imaging agent:biodistribution of ^(131)I-YG5 and ^(131)I-Boc-YG5

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Nuclear Science and techniques 2010年第5期21卷 302-305页

作者： SUN Xin chu taiwei wANG Xiangyun Beijing National Laboratory for Molecular Sciences Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science College of Chemistry and Molecular Engineering Peking University Beijing 100871 China

the cyclic peptide YG5 and the t-butyloxycarbonyl(Boc)-modified analog(Boc-YG5) were labeled with *** radiochemical purity of 131I-YG5 or 131I-Boc-YG5 was almost 100% after purification by *** in BALB/C nude mice bearing MCF-7 tumor was *** t-butyloxycarbonyl(Boc)-modification,the 131I-Boc-YG5 was quite resistant to deiodination in vivo,resulting in negligible radioactivity accumulation in *** radiotracer clearance in tumor became faster,the absolute tumor uptake decreased for 131I-Boc-YG5,but the tumor-to-tissue uptake ratios *** uptake ratios of tumor to muscle,blood,heart,and lung at 1 h post injection reached 4.73,1.70,4.09 and 1.70,*** is demonstrated that Boc-group is an effective prosthetic one to prevent deiodination in vivo and improve tumor imaging for radioiodinated NGR.

关键词：放射性碘标记肿瘤生物分布显像剂反相高效液相色谱法银放射化学纯度摄取率

Bimanual motor skill learning and robotic assistance for chronic hemiparetic stroke: a randomized controlled trial

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Neural Regeneration Research 2021年第8期16卷 1566-1573页

作者： Maral Yeganeh Doost Benoît Herman Adrien Denis Julien Sapin Daniel Galinski Audrey Riga Patrice Laloux Benoît Bihin Yves Vandermeeren UCLouvain CHU UCL Namur–site Mont-GodinneDepartment of NeurologyStroke UnitYvoirBelgium UCLouvain Institute of NeuroScience(IoNS)Clinical neuroscience division(NEUR)divisionBrusselsBelgium UCLouvain Louvain BionicsLouvain-la-NeuveBelgium UCLouvain Institute of MechanicsMaterials and Civil Engineering(iMMC)Louvain-la-NeuveBelgium AXINESIS SA WavreBelgique Scientific Support Unit CHU UCL Namur–site Mont-GodinneYvoirBelgium

Using robotic devices might improve recovery post-stroke, but the optimal way to apply robotic assistance has yet to be determined. the current study aimed to investigate whether training under the robotic active-assisted mode improves bimanual motor skill learning(biMSkL) more than training under the active mode in stroke patients. twenty-six healthy individuals(HI) and 23 chronic hemiparetic stroke patients with a detectable lesion on MRI or Ct scan, who demonstrated motor deficits in the upper limb, were randomly allocated to two parallel groups. the protocol included a two-day training on a new bimanual cooperative task, LIFt-tHE-tRAY, under either the active or activeassisted modes(where assistance decreased in a pre-determined stepwise fashion) with the bimanual version of the REAplan? robotic device. the hypothesis was that the active-assisted mode would result in greater biMSkL than the active mode. the biMSkL was quantified by a speed-accuracy trade-off(SAt) before(t1) and immediately after(t2) training on days 1 and 2(t3 and t4). the change in SAt after 2 days of training(t4/t1) indicated that both HI and stroke patients learned and retained the bimanual cooperative task. After 2 days of training, the active-assisted mode did not improve biMSkL more than the active mode(t4/t1) in HI nor stroke patients. whereas HI generalized the learned bimanual skill to different execution speeds in both the active and active-assisted subgroups, the stroke patients generalized the learned skill only in the active subgroup. taken together, the active-assisted mode, applied in a pre-determined stepwise decreasing fashion, did not improve biMSkL more than the active mode in HI and stroke subjects. Stroke subjects might benefit more from robotic assistance when applied "as-needed." this study was approved by the local ethical committee(Comité d'éthique médicale, chu UCL Namur, MontGodinne, Yvoir, Belgium;Internal number: 54/2010, Eudra Ct number: NUB B039201317382) on July 1

关键词： bimanual hemiparesis motor learning rehabilitation robotic robotic assistance slacking stroke retention

Gamma Spectrometry of Inhomogeneous Samples Using Peak-Ratio Method

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Journal of Applied Mathematics and Physics 2021年第11期9卷 2641-2659页

作者： thomas M. Semkow Liang t. chu Adam G. Burn wadsworth Center New York State Department of Health Empire State Plaza Albany NY USA Department of Environmental Health Sciences School of Public Health University at Albany State University of New York Rensse-laer NY USA

In gamma spectrometry of voluminous samples, inhomogeneous distribution of radioactivity caused by the presence of hot particles can create significant Bias in the results of activity determinations. we developed a novel method to reduce this Bias using the gamma-peak ratio. we show that the peak area ratio of two gamma peaks of different energies, emitted by the same radionuclide, is a sensitive measure of emitting source location and thus the inhomogeneity. A new calibration formula was then derived for true gamma efficiency pi as a function of efficiency ratio pi/pj of two peaks. this approach was verified by Monte Carlo simulations for a sample of 1-L volume containing from 1 up to 2048 of hot particles randomly distributed in a soil matrix. A 152Eu radionuclide was selected for calculations and we used various combinations of two gamma spectral peaks selected from three gamma energies of 121.8, 344.3, and 1408.0 keV. this new method is shown to reduce the Bias range and Bias standard deviation by several times when compared with the traditional homogeneous calibration applied to measuring hot particles. the method is independent of the number, location, and distribution of hot particles in the samples, and can be applied to a mixture of radionuclides. It complements our previous calibration model based on the peak-to-total ratio.

关键词： Monte Carlo Simulation Gamma Attenuation Hot Particle Effective Peak Efficiency Signal Detection theory

Statistical process monitoring based on improved principal component analysis and its application to chemical processes

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第7期14卷 520-534页

作者： chu-dong tONG Xue-feng YAN Yu-xin MA Key Laboratory of Advanced Control and Optimization for Chemical Processes of Ministry of Education East China University of Science and Technology

In this paper, a novel criterion is proposed to determine the retained principal components (PCs) that capture the dominant variability of online monitored data. the variations of PCs were calculated according to their mean and covariance changes between the modeling sample and the online monitored data. the retained PCs containing dominant variations were selected and defined as correlative PCs (CPCs). the new Hotelling's t2 statistic based on CPCs was then employed to monitor the process. Case studies on the simulated continuous stirred tank reactor and the well-known tennessee Eastman process demonstrated the feasibility and effectiveness of the CPCs-based fault detection methods.

关键词： Fault detection Principal component analysis (PCA) Correlative principal components (CPCs) tennessee Eastman process

Navigating Epstein–Barr virus autoimmunity:role of NK cells and t cells in multiple sclerosis

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Signal transduction and targeted therapy 2024年第3期9卷 833-835页

作者： chu Xie Cong Sun Mu-Sheng Zeng State Key Laboratory of Oncology in South China Guangdong Provincial Clinical Research Center for CancerGuangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and TherapySun Yat-sen University Cancer CenterGuangzhouP.R.China

In a recent study published in Cell,Vietzen and colleagues discovered the novel role of natural killer(NK)cells and EBVspecific CD8+t cell response in controlling EBV-inducing autoimmune response and collectively def... 详细信息

关键词： Epstein sclerosis killer

Neuroprotective effects of neurokinin receptor one agonist septide in models of Parkinson’s disease

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Neuroprotective effects of neurokinin receptor one agonist s...

Geochronology, Geochemistry and Hf Isotope of the Late Mesozoic Granitoids from the Lushi Polymetal Mineralization Area: Implication for the Destruction of Southern North China Craton

中国神经科学学会第四次会员代表大会暨第八届全国学术会议

作者： John M.t.chu K.K.L.YUNG Department of Biology Hong Kong Baptist University

＜正＞Parkinson’s disease（PD） is one of the serious motor *** is caused by degeneration of dopaminergic neurons in substantia ***（NK） is a group of neuropeptides that is suggested to be involved in the pathogenesis of *** the present study,neuroprotective effects of NKl receptor agonist septide to dopaminergic neurons were investigated using in vivo and in vitro ***,results of lactate dehydrogenase（LDH） assays showed that septide treatments reduced toxicity of 6-hydroxdopamine（6-OHDA） in cultured SH-SY5Y neuroblastoma ***, in unilateral 6-hydroxdopamine-leisoned rats,significantly higher cell number of tyrosine hydroxylase（tH）-immunoreac- tive neurons was found in the substantia nigra with lesion after septide *** addition,western blot experiments also showed that after septide treatments,there was significant up-regulation of phosphorylated Akt protein in the substantia nigra with *** results as a whole indicate that septide is a potential neuroprotective agent to dopaminergic neurons that protects the neurons against 6-OHDA *** neuroprotective effects of septide are likely to be mediated by the activation of PI3K/Akt cell survival signaling pathway.

关键词：

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Journal of Earth Science 2020年第2期31卷 313-329页

作者： Yuanyuan Zhai Shuai Gao Qingdong Zeng Shaoxiong chu Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Institution of Earth Science Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences、Beijing 100049 China Linyi Natural Resources and Planning Bureau Linyi 276000China

the North China Craton(NCC)is the best example of an Archean craton that has lost its stability in the Late *** the cratonic destruction is generally considered to have occurred in the Eastern Block and reached a peak in the Early Cretaceous,the exact areal extent of cratonic destruction is debated,especially the southern and northern margin of the *** we report geochronology,geochemical and Hf isotopic data of the Late Mesozoic granitoids from Lushi polymetal mineralization area(LPMA)in the southern margin of *** results provide new insights into the destruction in the southern margin of the NCC during the Late *** U-Pb dating indicates that eight granitoids intruded in the Late Jurassic to Early Cretaceous(136.8–154.1 Ma),*** signatures define these granitoids being A-type or I-type granite that formed in an extension *** addition,Hf isotopic compositions of zircons from these granitoids vary in a relatively large range,withεHf(t)values and tDM2 ages ranginge from-26.1 to+15.2 and 215 to 2849 Ma,*** parental magmas were likely derived from diverse sources,including materials of the partial melting of ancient lower crust and mantle-derived mafic magmas in various *** with previous studies on the contemporaneous magma-tectonic activities in circum of NCC,we suggest that the rim of NCC was already unstabilized from the Late Jurassic in the *** subduction of the Paleo-Pacific Plate was the main trigger to the destruction of the southern margin of NCC,which was responsible for the lithospheric extension and thinning,extensive magmatism and mineralization.

关键词： Late Mesozoic granitoids geochronology geochemistry Hf isotopic composition southern margin of NCC cratonic destruction