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Development of gated fiber detectors for laser-induced strong electromagnetic pulse environments

Nuclear Science and Techniques 2021年第6期32卷 36-44页

作者： Po Hu Zhi-guo Ma Kai Zhao guo-Qiang Zhang De-Qing Fang bao-Ren Wei chang-Bo Fu Yu-Gang Ma Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China School of Physical Science and Technology Shanghai Tech UniversityShanghai 201210China School of Nuclear Sciences and Technology University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China

With the development of laser technologies,nuclear reactions can happen in high-temperature plasma environments induced by lasers and have attracted a lot of attention from different physical ***,studies on nuclear reactions in plasma are still limited by detecting *** is mainly due to the fact that extremely high electromagnetic pulses(EMPs)can also be induced when high-intensity lasers hit targets to induce plasma,and then cause dysfunction of many types of traditional ***,new particle detecting technologies are highly *** this paper,we report a recently developed gated fiber detector which can be used in harsh EMP *** this prototype detector,scintillating photons are coupled by fiber and then transferred to a gated photomultiplier tube which is located far away from the EMP source and shielded *** those measures,the EMPs can be avoided which may result that the device has the capability to identify a single event of nuclear reaction products generated in laser-induced plasma from noise EMP *** new type of detector can be widely used as a time-of-flight(TOF)detector in high-intensity laser nuclear physics experiments for detecting neutrons,photons,and other charged particles.

关键词： Gated fiber detector Radiation detection High-intensity laser Strong electromagnetic pulses

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ON NODAL LINE OF THE SECOND EIGENFUNCTION OF THE LAPLACIAN OVER CONCAVE DOMAINS IN R^2

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Journal of Systems Science & Complexity 2013年第3期26卷 483-488页

作者： YANG Dong-Hui guo bao-Zhu Department of Mathematics Central South University Academy of Mathematics and Systems Science Academia Sinica

In this note,the Payne's conjecture from convex domains to concave domains is *** is shown that the nodal line N of the second eigenfunction of the Laplacian over some simply connected concave domain Ω in R^2 must in... 详细信息

关键词： Eigenfunction eigenvalue Laplacian.

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A route for the study on mass transfer enhancement by adding particles in liquid phase

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Chinese Journal of Chemical Engineering 2022年第8期35卷 158-165页

作者： Xing Su Ning Qiao bao-chang Sun College of Chemical and Material Engineering Quzhou UniversityQuzhou 324000China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China

This work presents a route for the study on the absorption performance of gas into liquid under the condition of adding particles in a stirred constant temperature *** evaluated systems,hydrogen–water and hydrogen–methanol,with the addition of activated carbon particles(ACP)were carried out,*** results showed that the addition of ACP into the water can enhance the mass transfer between hydrogen and water,the enhancement factor increases rapidly with the increase of the ACP content,and then tends to be ***,for the hydrogen–methanol system,ACP has little effect on the mass transfer *** addition,a gas–liquid mass transfer model considering the effect of solid particle enhancement was established based on the shuttle effect and two-film *** indicated that the predicted value agreed well with the experimental value in both hydrogen–methanol–ACP and hydrogen–water–ACP systems.

关键词： Mass transfer Hydrogen Water Methanol Activated carbon

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Numerical simulation of flash reduction in a drop tube reactor with variable temperatures

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International Journal of Minerals,Metallurgy and Materials 2022年第2期29卷 228-238页

作者： Yiru Yang Qipeng bao Lei guo Zhe Wang Zhancheng guo State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

A computational fluid dynamics(CFD)model was developed to accurately predict the flash reduction process,which is considered an efficient alternative ironmaking ***-scale experiments were conducted in drop tube reactors to verify the accuracy of the CFD *** reduction degree of ore particles was selected as a critical indicator of model prediction,and the simulated and experimental results were in good *** influencing factors,including the particle size(20–110μm),peak temperature(1250–1550°C),and reductive atmosphere(H_(2)/CO),were also *** height variation lines indicated that small particles(50μm)had a longer residence time(3.6 s)than large *** provided a longer residence time(~1.29 s)than H_(2)(~1.09 s).However,both the experimental and analytical results showed that the reduction degree of particles in CO was significantly lower than that in H2 *** optimum experimental particle size and peak temperature for the preparation of high-quality reduced iron were found to be 50μm and 1350°C in H2 atmosphere,and40μm and 1550°C in CO atmosphere,respectively.

关键词： flash reduction hematite particles drop tube reactor numerical analysis

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Relationship between Thermodynamic Parameters for Mn-Fe Melt and Temperature

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Journal of Iron and Steel Research International 2004年第3期11卷 5-10页

作者： CHEN Er-bao DONG Yuan-chi guo Shang-xing WU bao-guo Anhui University of Technology

The carbon solubility in Mn-Fe melts were measured at 1350℃,1375℃,1425℃and 1450 ℃,and accordingly the calculated equations were *** thermodynamic derivation and calculation,some relationships between thermodynamic... 详细信息

关键词： Mn-Fe melt thermodynamic parameter temperature activity interaction coefficient

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雅西高速冕宁段主要地质灾害类型及发育规律

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地质力学学报 2013年第4期19卷 364-376页

作者：张瑞端郭长宝孙进忠张永双付晓晓汪西海中国地质大学(北京)工程技术学院北京100083 中国地质科学院地质力学研究所北京100081

在资料搜集、野外地质调查的基础上,对雅西高速冕宁段主要地质灾害类型及发育规律进行了分析总结,以期减少和预防高速公路遭受崩塌、滑坡和泥石流等的危害。研究表明,该区地质灾害类型主要为滑坡和泥石流,且以泥石流为主,具有分布广、... 详细信息

在资料搜集、野外地质调查的基础上,对雅西高速冕宁段主要地质灾害类型及发育规律进行了分析总结,以期减少和预防高速公路遭受崩塌、滑坡和泥石流等的危害。研究表明,该区地质灾害类型主要为滑坡和泥石流,且以泥石流为主,具有分布广、密度大、危害性大等特点,在空间和时间上具有群发性和集中诱发的特征;地质构造、地形地貌、新构造运动、地层岩性是导致雅西高速冕宁段崩塌、滑坡和泥石流灾害频繁发生的内在影响因素,降雨、地震及人类工程活动是最为重要的诱发因素。

关键词：雅西高速冕宁段地质灾害发育规律

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Tetra-detector size exclusion chromatography characterization of molecular and solution properties of soluble microbial polysaccharides from an anaerobic membrane bioreactor

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Frontiers of Environmental Science & Engineering 2017年第2期11卷 165-174页

作者： Qingbin guo Sheng chang School of Engineering University of Guelph Guelph Ontario N 1G 2W1 Canada

Characterization of the molecular properties of soluble microbial products （SMP） is critical for understanding the membrane filtration and fouling mechanisms in anaerobic and aerobic membrane bioreactors （AnMBR ＆ MBR）. In this study, the distributions of the absolute molecular weight and intrinsic viscosity of SMP polysaccharides from an AnMBR were effectively determined by a high pertbrmance size exclusion chromatography （HPSEC） that was coupled with the refractive index （RI）,cliode array UV （DAUV）, right and low angle light scattering （LS）, and viscometer （Vis） detectors. Based on the tetra-detector HPSEC determined absolute molecular weights and intrinsic viscosity, a universal calibration relationship for the SMP polysaccharides was developed and the molecularconformations, average molecular weights~ and hydrodynamic sizes of the SMP polysaccharides were also explored. Two factors which can be derived from the tetra-detector HPSEC analysis were proposed for the characterization of the viscous and osmotic pressure properties of the SMP polysaccharides. In addition, it was also extrapolated how to analyze the resistance characteristics of the concentration polarization layers formed in membrane filtration based on the molecular properties determined by the tetra-detector HPSEC analysis.

关键词： Soluble microbial productExtracellular polymeric substanceMembrane bioreactorMembrane foulingMolecular weightIntrinsic viscosity

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Advancements in adoptive CAR immune cell immunotherapy synergistically combined with multimodal approaches for tumor treatment

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Bioactive Materials 2024年第12期42卷 379-403页

作者： Yun chang Mingyang chang Xiaoping bao Cheng Dong Department of Biomedical Engineering The Hong Kong Polytechnic University999077Hong KongChina The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen518000China Davidson School of Chemical Engineering Purdue UniversityWest LafayetteIN47907USA Purdue University Institute for Cancer Research West LafayetteIN47907USA

Adoptive immunotherapy,notably involving chimeric antigen receptor(CAR)-T cells,has obtained Food and Drug Administration(FDA)approval as a treatment for various hematological malignancies,demonstrating promising preclinical efficacy against ***,the intricate and resource-intensive autologous cell processing,encompassing collection,expansion,engineering,isolation,and administration,hamper the efficacy of this therapeutic ***,conventional CAR T therapy is presently confined to addressing solid tumors due to impediments posed by physical barriers,the potential for cytokine release syndrome,and cellular exhaustion induced by the immunosuppressive and heterogeneous tumor ***,a strategic integration of adoptive immunotherapy with synergistic multimodal treatments,such as chemotherapy,radiotherapy,and vaccine therapy etc.,emerges as a pivotal approach to surmount these inherent *** collaborative strategy holds the key to addressing the limitations delineated above,thereby facilitating the realization of more precise personalized therapies characterized by heightened therapeutic *** synergistic strategy not only serves to mitigate the constraints associated with adoptive immunotherapy but also fosters enhanced clinical applicability,thereby advancing the frontiers of therapeutic precision and effectiveness.

关键词： Adoptive cellular immunotherapy Immune cell engineering Multiple-model synergistic therapy Tumor microenvironment

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Rotation,scaling and translation invariant image watermarking using feature points

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The Journal of China Universities of Posts and Telecommunications 2008年第2期15卷 82-87页

作者： LI Lei-da guo bao-long guo Lei Institute of Intelligent Control and Image Engineering Xidian UniversityXi'an 710071 China National Laboratory of Pattern Recognition Chinese Academy of SciencesBeijing 100080 China

In this article, a novel robust image watermarking scheme is presented to resist rotation, scaling, and translation （RST）. Initially, the original image is scale normalized, and the feature points are then extracted. Furthermore, the locally most stable feature points are used to generate several nonoverlapped circular regions. These regions are then rotation normalized to generate the invariant regions. Watermark embedding and extraction are implemented in the invariant regions in discrete cosine transform domain. In the decoder, the watermark can be extracted without the original image. Simulation results show that the proposed scheme is robust to traditional signal processing attacks, RST attacks, as well as some combined attacks.

关键词： image watermarking geometric attack featurepoint image normalization

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Structure-dependent re-dispersibility of graphene oxide powders prepared by fast spray drying

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Chinese Journal of Chemical Engineering 2021年第4期34卷 485-492页

作者： Yexun Shi chang Li Liming Shen Ningzhong bao College of Chemical Engineering State Key Laboratory of Material-Oriented Chemical EngineeringNanjing Tech UniversityNanjing 210009China

The graphene oxide powder(GOP)obtained from the spray drying process often exhibits poor redispersibility which is considered due to the partial reduction of GO *** reduction of drying temperature can effectively increase the redispersibility of GOP,but result in a decreased drying ***,we found that the redispersibility of GOP is strongly affected by its microstructure,which is determined by the feed *** the increase of feed concentration,the GO nanosheet assembly varies from the disordered stacking to relatively oriented assembly,making the morphology of the GOP transform from balllike(the most crumpled one)to flakelike(the least crumpled one),and the 0.8 mgml 1 is the threshold concentration for the morphology,structure,and redispersibility *** the feed concentration reaches 0.8 mg ml 1,the appearance of the nematic phase in droplet ensures the relatively oriented assembly of GO sheets to form the layered structure with a low crumpling degree,which greatly improves the polar parts surface tension of the solid GOP,making the GOP easier to form hydrogen bonding with water during the redispersion process,thus stabilizing *** work provides useful information for understanding the relationships between the morphology,microstructure,and final redispersibility of GOPs.

关键词： Graphene oxide powder Spray drying Re-dispersibility Oriented assembly Layered structure

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