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Fast efficient photon deceleration in plasmas by using two laser pulses at different frequencies

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Matter and radiation at Extremes 2024年第3期9卷 11-18页

作者： Y.X.Wang X.L.Zhu S.M.Weng p.li X.F.li h.Ai h.r.pan Z.M.Sheng Key Laboratory for Laser plasmas(moe) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China collaborative Innovation center of IFSA Shanghai Jiao Tong UniversityShanghai 200240China research center of Laser Fusion of china Academy of Engineering physics MianyangSichuan 621900China State key Laboratory of high Field Laser physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Tsung-dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China

The generation of ultrashort high-power light sources in the mid-infrared(mid-Ir)to terahertz(Thz)range is of interest for applications in a number of fields,from fundamental research to biology and *** conventional laser technology,photon deceleration in plasma wakes provides an alternative approach to the generation of ultrashort mid-Ir or Thz ***,we present a photon deceleration scheme for the efficient generation of ultrashort mid-Ir or Thz pulses by using an intense driver laser pulse with a relatively short wavelength and a signal laser pulse with a relatively long *** signal pulse trails the driver pulse with an appropriate time delay such that it sits at the front of the second wake bubble that is driven by the driver *** to its relatively long wavelength,the signal pulse will be subjected to a large gradient of the refractive index in the plasma wake ***,the photon deceleration in the plasma wake becomes faster and more efficient for signal pulses with longer *** greatly enhances the capacity and efficiency of photon deceleration in the generation of ultrashort high-power light sources in the long-wavelength Ir and Thz spectral ranges.

关键词： laser ultrashort photon

cr-induced fusion reactions to synthesize superheavy elements

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nuclear Science and Techniques 2024年第5期35卷 122-130页

作者： S.Madhu h.c.Manjunatha n.Sowmya B.M.rajesh L.Seenappa r.S.Susheela Department of physics R V College of EngineeringBangalore 560074India Visvesvaraya Technological University BelagaviKarnataka 590018India Department of physics Government First Grade CollegeSrinivasapurKarnataka 563135India Department of physics Government First Grade CollegeDevanahallyKarnataka 562110India Department of physics Government First Grade CollegeMulbagalKarnataka 563131India Department of physics Government First Grade collegeNanjangudOoty RoadMysore 571301India

We investigated ^(50,52-54)cr-induced fusion reactions for the synthesis of the superheavy element in the 104≤Z≤122 *** cross sections produced in this investigation using ^(54)cr projectiles were compared with those obtained in prior *** estimated cross sections from this analysis are consistent with the findings of prior *** the current study,the predicted cross section was found to be 42fb at 236 MeV for ^(53)cr+^(243)Am,23.2 fb at 236 MeV for ^(54)cr+^(247)cm,95.6 fb at 240 MeV for ^(53)cr+248Bk,and 1.33 fb at 242 MeV for ^(53)cr+***,these projected cross sections with excitation energy and beam energy will be useful in future cr-induced fusion reaction investigations.

关键词： Fusion cross sections compound nucleus formation probability Survival probability Evaporation residue cross sections

Atomistic Investigation of Shock-Induced Amorphization within Micro-shear Bands in hexagonal close-packed Titanium

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Acta Metallurgica Sinica(English Letters) 2024年第9期37卷 1590-1600页

作者： Z.c.Meng K.G.Wang T.Ali D.li c.G.Bai D.S.Xu S.J.li A.h.Feng G.J.cao J.h.Yao Q.B.Fan h.Wang r.Yang Institute of Metal research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Interdisciplinary centre for Additive Manufacturing(IcAM) School of Materials and ChemistryUniversity of Shanghai for Science and TechnologyShanghai 200093China School of Materials Science and Engineering Tongji UniversityShanghai 201804China Key Laboratory for light-Weight Materials Nanjing Tech UniversityNanjing 210009China national Key Laboratory of Science and Technology on Materials Under Shock and Impact School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology chongqing Innovation center Chongqing 401135China

The mechanical response of a single crystal titanium sample against(0001)α surface impact was investigated using molecular dynamics ***,non-uniform plastic deformation was observed in the *** high strain rates,amorphization occurred near the edge of the contact region where severe shear strain induced a large number of stacking faults(SFs)and *** contrast,the central part of the contact region underwent less deformation with significantly fewer ***,instead of amorphization by consuming SFs and dislocations,there was a gradual increase in the density of dislocations and SFs during the process of *** local amorphous regions eventually grew into shear bands.

关键词： Shock compression Amorphization Shear band Titanium Molecular dynamics

Bile acid signaling in the regulation of whole body metabolic and immunological homeostasis

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Science china(life Sciences) 2024年第5期67卷 865-878页

作者： Wei Jia Yitao li Kenneth c.p.cheung Xiaojiao Zheng School of chinese Medicine Hong Kong Baptist UniversityHong KongChina center for Translational Medicine and Shanghai Key Laboratory of Diabetes Mellitus Shanghai Sixth People's Hospital Affiliated to Shanghai JiaoTong University School of MedicineShanghai 200233China

Bile acids(BAs)play a crucial role in nutrient absorption and act as key regulators of lipid and glucose metabolism and immune *** the enterohepatic circulation,BAs are synthesized,metabolized,and reabsorbed,with a portion entering the vascular circulation and distributing *** allows BAs to interact with receptors in all major organs,leading to organ-organ interactions that regulate both local and global metabolic processes,as well as the immune *** review focuses on the whole-body effects of BA-mediated metabolic and immunological regulation,including in the brain,heart,liver,intestine,eyes,skin,adipose tissue,and *** BA synthesis and receptor signaling is a promising strategy for the development of novel therapies for various diseases throughout the body.

关键词： bile acid whole body metabolism immunity

Stability Analysis of Dc Microgrid clusters Based on Step-by-step System Matrix Building Algorithm

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Journal of Modern power Systems and clean Energy 2024年第3期12卷 900-912页

作者： K.Jithin n.Mayadevi r.hari Kumar V.p.Mini the Department of Electrical Engineering College of Engineering TrivandrumAPJ Abdul Kalam Technological University(APJAKTU)ThiruvananthapuramIndia

Dc microgrids(DcMGs)are made up of a network of sources and loads that are connected by a number of power electronic converters(pEcs).The increase in the number of these pEcs instigates major concerns in system *** interconnecting the microgrids to form a cluster,the system stability must be *** paper proposes a novel stepby-step system matrix building(SMB)algorithm to update the system matrix of an existing DcMG cluster when a new microgrid is added to the cluster through a distribution *** stability of the individual DcMGs and the DcMG cluster is analyzed using the eigenvalue ***,the particle swarm optimization(pSO)algorithm is used to retune the controller gains if the newly formed cluster is not *** simulation of the DcMG cluster is carried out in MATLAB/Simulink environment to test the proposed *** results are also validated using the Op4510 real-time simulator(rTS).

关键词： converter Dc microgrid cluster eigenvalue interconnection particle swarm optimization system stability system matrix

Study of ZnO nanoparticle-supported clay minerals for electrochemical sensors,photocatalysis,and antioxidant applications

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chemphysMater 2024年第1期3卷 83-93页

作者： Mylarappa M n.raghavendra n.r.Bhumika c.h.chaithra B.n.nagalaxmi K.n.Shravana Kumara Department of chemistry Sri Jagadguru Renukacharya College of ScienceArts&CommerceBengaluru 560009India Department of chemistry East West Institute of TechnologyBengaluru 560091India Department of chemistry Maharani Lakshmi Ammanni College for WomenBengaluru 560012India

In view of the current study’s demonstration of the synthesis of clay-doped ZnO composites,we present a low-cost method for producing clay-metal oxide(clay/ZnO).Utilizing the solution combustion technique,a composite of clay/ZnO was produced utilizing citric acid as both a fuel and a complexing *** hexagonal unit cell structure of the created clay/ZnO may be seen using XrD *** ZnO-infused clay was visible in FE-SEM micrographs as homogenous,sphere-shaped *** possible involvement of clay/ZnO photocatalytic activity in the UV-induced photodegradation of malachite green dye was *** 90%degradation rate shows the composite’s outstanding photocatalytic degradation *** resulting substance was electrochemically analyzed using a constructed electrode in 0.1 M KOh *** increased its sensor capabilities,which now include chemical and biomolecule sensors,and it excelled in cyclic voltammetry-based redox potential *** efficiently evaluate chemically synthesized nps for electrochemical,sensing,and photocatalytic applications,this study intends to create a solution combustion procedure for the synthesis of clay/ZnO nanocomposite using urea as fuel.

关键词： clay clay/ZnO photocatalytic Electrochemical sensors

ce-and La-doped polymetallic layered double hydroxides for enhanced oxygen evolution reaction performance at high current density

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Science china chemistry 2024年第8期67卷 2586-2598页

作者： rinel r.Kimaka p. ping Wang Miao he Senyao Meng Jiasai Yao huawei li cheng Yang Zhenxing li State Key Laboratory of heavy Oil processing College of New Energy and MaterialsChina University of Petroleum(Beijing)Beijing 102249China

polymetallic layered double hydroxides are promising cost-effective catalysts for the oxygen evolution reaction(OEr) due to their versatile anionic and cationic tunability. nevertheless, several challenges persist, notably, issues related to low electrical conductivity, poor catalytic activity, and stability, especially at high current density. herein, we report the design of ce-and Ladoped co ni Fe-layered double hydroxide(ce La co ni Fe-LDh) nanosheets through a facile and scalable in situ self-assembly strategy that displays enhanced OEr activity. Experimental and theoretical investigations provide insights into the impact of ceand La-doping by comparing ce co ni Fe-LDh, La co ni Fe-LDh, and pristine co ni Fe-LDh, all synthesized using the same methodology. These results reveal that doping ce^(3+)and La^(3+)into co ni Fe-LDh substantially improves its electronic structure,resulting in enhanced conductivity, more oxygen vacancies(Vo), electron interaction, and active site formation. consequently,significantly reduced overpotentials of 175, 314, and 424 m V at 10, 100, and 500 m A cm^(-2), respectively, and a highly stable current density of 120 h in 1 M KOh were achieved. notably, these performance metrics surpass those of unmodified LDhs and are competitive with many lanthanide-doped transition metal-based LDh electrocatalysts, as well as noble metal catalysts like ruthenium catalysts. This work represents a pioneering effort in doping ce^(3+)and La^(3+)ions into a functional co ni Fe-based electrocatalyst, offering inspiring OEr performance and scalability potential.

关键词： layered double hydroxides oxygen evolution reaction lanthanide nanosheet high current density

role of marine natural products in the development of antiviral agents against SArS‑coV‑2:potential and prospects

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Marine life Science & Technology 2024年第2期6卷 280-297页

作者： D.p.nagahawatta n.M.liyanage Thilina U.Jayawardena h.h.A.c.K.Jayawardhana Seong‑hun Jeong hyung‑Jun Kwon You‑Jin Jeon Department of Marine life Sciences Jeju National UniversityJeju 690-756Republic of Korea Department of chemistry Biochemistry and PhysicsUniversitédu QuébecàTrois-RivièresTrois-RivièresQC G8Z 4M3Canada Marine Science Institute Jeju National UniversityJeju 63333Republic of Korea Functional Biomaterial research center Korea Research Institute of Bioscience and BiotechnologyJeongeup-siRepublic of Korea

A novel coronavirus,known as severe acute respiratory syndrome coronavirus 2(SArS-coV-2),has surfaced and caused global concern owing to its ***-coV-2 is the causative agent of coronavirus disease 2019;however,it was only discovered at the end of the year and was considered a pandemic by the World health ***,the develop-ment of novel potent inhibitors against SArS-coV-2 and future outbreaks is urgently *** naturally occurring bioactive substances have been studied in the clinical setting for diverse *** intricate infection and replication mechanism of SArS-coV-2 offers diverse therapeutic drug targets for developing antiviral medicines by employing natural products that are safer than synthetic *** natural products(Mnps)have received increased attention in the development of novel drugs owing to their high diversity and ***,this review article investigates the infection and replication mechanisms,including the function of the SArS-coV-2 genome and ***,we highlighted anti-SArS-coV-2 therapeutic intervention efforts utilizing Mnps and predicted SArS-coV-2 inhibitor design.

关键词： SArS-coV-2 Marine natural products Drug targets Inhibitors

Marinoan glaciation in the Indian subcontinent——Anatomy and global implications

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Journal of palaeogeography 2024年第2期13卷 293-308页

作者： h.n.Bhattacharya Department of Earth Sciences Techno India UniversityWest BengalSector VSalt LakeKolkata700091India

Detailed sedimentological analysis of the pokaran Boulder Bed,representing the most basal unit of the neoproterozoic-Lower cambrian Marwar Supergroup,clearly indicates its glacial *** glacial sediments are interpreted as an ice-contact submarine fan *** on the detrital and inherited zircon population of the Marwar Supergroup sediments and interlayered pyroclastic deposits,a Marinoan cryochron of the cryogenian period is envisaged for the pokaran Boulder *** well-preserved Ediacaran elements in the post-glacial sedimentary succession also support a cryogenian to Early cambrian age of the Marwar *** glacial deposition at the base of the Marwar Supergroup strengthens the regional correlation between the studied sediments with the Lesser himalayan Blaini-Krol-Tal sediments and the haqf Supergroup of *** available zircon ages and paleomagnetic data of the Malani Igneous suite,along with the Marinoan glacial deposits,detrital zircon ages,and Ediacaran fossil elements of the Marwar Supergroup add significant information to the neoproterozoic Earth history.

关键词： neoproterozoic Marinoan glaciation Diamictites pokaran Boulder Bed Marwar Supergroup