检索结果-南通市图书馆

Reflection Asymmetric Shapes in the Neutron-Rich ^(140,143)Ba Isotopes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1997年第8期14卷 569-572页

作者：朱胜江王牧歌 J.H.Hamilton A.V.Ramayya B.R.S.Babu W.C.Ma 龙桂鲁邓景康朱凌燕李明 T.N.Ginter J.komicki J.D.Cole R.Aryaeinejadv Y.k.Dardenne M.W.Drigert J.O.Rasmussen Yu.Ts.Oganessian M.A.Stoyer S.Y.Chu k.e.gregorich M.F.Mohar S.G.Prussin I.Y.Lee N.R.Johnson F.k.McGowan Department of Physics Tsinghua UniversityBeijing 100084 Department of Physics Vanderbilt UniversityNashvilleTN 37235U.S.A. Department of Physics Mississippi State UniversityMS 39762U.S.A. daho National engineering Laboratory Idaho FallsID 83415U.S.A. Lawrence Berkeley Laboratory BerkeleyCA 94720U.S.A. Oak Ridge National Laboratory Oak RidgeTN 37831U.SA.

Level schemes for the neutron-rich ^(140,143)Ba nuclei have been determined by study of promptγ-rays in spontaneous fission of ^(252)Cf.The level pattern and enhanced e1 transitions betweenπ=+andπ=-bands show reflection asymmetric shapes with simplex quantum number s=+1 in ^(140)Ba and s=±i in ^(143)Ba,respectively.The octupole deformation stability with spin variation has been discussed.

关键词： bands transitions

Octupole Deformation and Signature Inversion in ^(145)Ba

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1999年第10期16卷 715-717页

作者：朱胜江萨哈伊 J.H.Hamilton A.V.Ramayya 甘翠云朱凌燕杨利明龙桂鲁朴秀日 B.R.S.Babu J.k.Hwang W.C.Ma J.komicki X.Q.Zhang e.F.Jones J.D.Cole R.Aryaeinejad M.W.Drigert J.O.Rasmussen M.A.Stoyer S.Y.Chu k.e.gregorich M.F.Mohar S.G.Prussin I.Y.Lee Yu.Ts.Oganessian M.Ter-Akopian A.V.Daniel Department of Physics Tsinghua UniversityBeijing 100084 Department of Physics Vanderbilt UniversityNashvilleTN 37235USA Department of Physics Mississippi State UniversityMS 39762USA Idaho National engineering Laboratory Idaho FallsID 83415USA Lawrence Berkeley Laboratory BerkeleyCA 94720USA Joint Institute for Nuclear Research Dubna 141980Russia

High spin states in neutron-rich odd-N ^(145)Ba nucleus have been investigated from study of promptγ-rays in spontaneous fission of^(252)Cf.The alternating parity bands are identified indicating octupole deformation with simplex quantum number s=-i.The ground state band shows signature splitting and inversion at low spin.These collective band structures exhibit the competition and co-existence between symmetric and asymmetric shapes.

关键词： Inversion collective signature

Octupole Deformation Bands of πh_(11/2) in Neutron-Rich 145,147La Nuclei

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1999年第3期16卷 169-171页

作者：朱胜江王牧歌 J.H.Hamilton A.V.Ramayya B.R.S.Babu W.C.Ma 龙桂鲁朱凌燕李明萨哈伊甘翠云杨利明 J.komicki J.D.Cole R.Aryaeinejad M.W.Drigert J.O.Rasmussen M.A.Stoyer S.Y.Chu k.e.gregorich M.F.Mohar S.G.Prussin I.Y.Lee Yu.Ts.Oganessian G.M.Ter-Akopian A.V.Daniel Department of Physics Tsinghua UniversityBeijing 100084 Department of Physics Vanderbilt UniversityNashvilleTN 37235USA Department of Physics Mississippi State UniversityMS 39762USA Idaho National engineering Laboratory Idaho FallsID 83415USA Lawrence Berkeley Laboratory BerkeleyCA 94720USA Joint Institute for Nuclear Research Dubna 141980Russia

Octupole deformation bands built onπh ll/2 orbital in neutron-rich odd-Z 145,147La nuclei have been investigated by measuring the promptγ-rays emitted from the 252Cf source.The alternating parity band structures and strong e1 transitions observed between negative-and positive-parity bands in both nuclei indicate the octupole deformation enhanced by the h ll/2 single proton coupling.According to observed energy displacements the octupole deformation becomes stable at the intermediate spin states.

关键词： coupling. bands parity

exploration of chromene-based BioAIegens

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2024年第3期11卷 47-48页

作者： Fritz e.kühn Department of Chemistry&Catalysis Research Center School of Natural Sciences Technical University of Munich

Photoemission efficiency is usually higher in solution than in solid state.Some compounds however, display a reverse behavior. Such a behavior is called aggregation-induced emission(AIe).

关键词：

Insm1:orchestrating cellular mimicry in the thymus medulla

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2024年第4期21卷 414-416页

作者： k.D.James J.e.Cowan UCL Institute of Immunity and Transplantation The Pears BuildingRowland Hill StreetLondonNW32PPUK

The thymus is the primary production site for a functional and self-tolerant T-cell repertoire.The establishment of immune tolerance is mediated by the generation and presentation of tissue-restricted self-antigens(TRAs)by medullary thymic epithelial cells(mTeCs),which screen T-cell receptors for self-reactivity to eliminate autoreactive T cells.Recent studies have extended our understanding of mTeC heterogeneity by examining the mechanisms by which mTeCs mimic the peripheral self[1].

关键词： medullary eliminate restricted

Immunotherapy of gastric cancer:Present status and future perspectives

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2024年第8期30卷 779-793页

作者： John k Triantafillidis Manousos M konstadoulakis Apostolos e Papalois Inflammatory Bowel Disease Unit “Metropolitan General”HospitalHolargos 15562AtticaGreece.Hellenic Society for Gastrointestinal Oncology354 Iera OdosChaidari 12461AtticaGreece Second Department of Surgery University of Athens School of MedicineAretaieion HospitalAthens 11528AtticaGreece Unit of Surgical Research and Training Second Department of SurgeryUniversity of AthensSchool of MedicineAretaieion HospitalAthens 11528AtticaGreece

In this editorial,we comment on the article entitled“Advances and key focus areas in gastric cancer immunotherapy:A comprehensive scientometric and clinical trial review(1999-2023),”which was published in the recent issue of the World Journal of Gastroenterology.We focused on the results of the authors’bibliometric analysis concerning gastric cancer immunotherapy,which they analyzed in depth by compiling the relevant publications of the last 20 years.Before that,we briefly describe the most recent data concerning the epidemiological parameters of gastric cancer(GC)in different countries,attempting to give an interpretation based on the etiological factors involved in the etiopathogenesis of the neoplasm.We then briefly discuss the conservative treatment(chemotherapy)of the various forms of this malignant neoplasm.We describe the treatment of resectable tumors,locally advanced neoplasms,and unresectable(advanced)cases.Special attention is given to modern therapeutic approaches with emphasis on immunotherapy,which seems to be the future of GC treatment,especially in combination with chemotherapy.There is also a thorough analysis of the results of the study under review in terms of the number of scientific publications,the countries in which the studies were conducted,the authors,and the scientific centers of origin,as well as the clinical studies in progress.Finally,an attempt is made to draw some conclusions and to point out possible future directions.

关键词： Gastric cancer Chemotherapy Immunotherapy Immune checkpoint inhibitors Bibliometrics Scientometrics

emission colour tuning in kLnF_(4):Yb^(3+),er^(3+)/Ho^(3+)phosphor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare earths 2024年第1期42卷 57-65,I0002页

作者： Janani k Gayathri e Vijayatha V Ramasubramanian S Thiyagarajan P Department of Science and Humanities Nehru Institute of TechnologyKaliapuramThirumalayampalayamCoimbatoreIndia Department of Sciences Amrita School of Physical SciencesAmrita Vishwa VidyapeethamCoimbatoreIndia Department of Physics Anna UniversityChennaiIndia

kLnF_(4):Yb^(3+),er^(3+)/Ho^(3+)(Ln=Y,Yb,Gd)phosphors were prepared by solid-state reaction technique.For each of the Yb^(3+)/er^(3+)and Yb^(3+)/Ho^(3+)co-doped phosphors independently,phase confirmation and morphological examination were accomplished using the X-ray diffraction technique and scanning electron microscope analysis.X-ray photoelectron spectroscopy analysis shows the charge state and existence of lanthanides and dopants.Upconversion luminescence emissions of green and red colour were detected for the synthesized phosphors.The changes in the upconverted emission intensities and colour output pertaining to the change of the lanthanide host matrix along with dopants were investigated for the prepared phosphors.In the upconversion luminescence,erbium-doped samples exhibit a predominance of red emission while holmium-doped samples display a prevalence of green emission.The rare-earth er/Ho doped kYbF4shows strong red emission compared to other hosts.kYF_(4):Yb,er/Ho exhibits relatively significant green upconve rsion emissions,while Yb,er-doped kGdF_(4)host displays a 10-fold increase in green/red emission ratio with an increase in the input power of 20-780 mW.Downshifting photoluminescence studies and decay curve analysis were carried out using UV light excitation for the developed phosphors.A higher lifetime of 2.2 ms was measured for the downshifting red emission in the Ho doped kYbF_(4)sample.This study suggests a potential for colour tunability in the upconversion and downshifting emissions through host modifications to the fluoride phosphor.

关键词： Rare earths energy transfer upconversion Downshifting Colour coordinates

维普期刊数据库

丰中子核^(145,147)La的八极形变

在线全文

学校读者我要写书评

暂无评论

高能物理与核物理 2000年第5期24卷 418-425页

作者：朱胜江王牧歌朱凌燕李明甘翠云杨利明萨哈伊朴秀日邓景康龙桂鲁 J.H.Hamilton A.V.Ramayya B.R.S.Babu J.k.Hwang W.C.Ma J.komicki J.D.Cole R.Aryaeinejad M.W.Drigert J.O.Rasmussen M.A.Stoyer S.Y.Chu k.e.gregorich M.F.Mohar S.G.Prussin I.Y.Lee Yu.Ts.Oganes 清华大学现代应用物理系北京100084 DepartmentofPhysics VanderbiltUniversityNashville DepartmentofPhysics MississippiStateUniversity IdahoNationalengineeringLaboratory IdahoFalls LawrenceBerkeleyLaboratoryBerkeley JointInstituteforNuclearResearch

通过对 2 5 2　Cf自发裂变产生的瞬发γ谱的实验研究 ,建立与扩展了丰中子核145 ,147　　La的高自旋态能级图 ,最高自旋态达到 ( 4 1 / 2 + )与 ( 4 3/ 2 - ) .测得的交叉相联的相反宇称带及带间的强化e1跃迁说明在 145 ,147　　La中形... 详细信息

通过对 2 5 2　Cf自发裂变产生的瞬发γ谱的实验研究 ,建立与扩展了丰中子核145 ,147　　La的高自旋态能级图 ,最高自旋态达到 ( 4 1 / 2 + )与 ( 4 3/ 2 - ) .测得的交叉相联的相反宇称带及带间的强化e1跃迁说明在 145 ,147　　La中形成强的八极形变 .对145 La的研究表明 ,具有轴对称形状的四极形变与具有反演不对称形状的八极形变在同一核中产生共存与竞争 .在πh11/ 2 带中观测到的带交叉位于 ω≈ 0 2 6— 0 30MeV附近 ,由推转壳模型计算表明 ,它是由一对i13/ 2

关键词：高自旋态八极形变镧145 镧147

维普期刊数据库

enhanced quantum resources via two distant atom-cavity systems under the influence of atomic dissipation

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第2期76卷 62-73页

作者： M Setodeh kheirabady M k Tavassoly M Rafeie e Ghasemian Laser and Optics Group Faculty of PhysicsYazd UniversityYazd 89195-741Iran Department of electrical engineering Faculty of Intelligent Systems Engineering and Data SciencePersian Gulf UniversityBushehrIran

Quantum resources such as entanglement and coherence are the holy grail for modern quantum technologies. Although the unwanted environmental effects tackle quantum information processing tasks, suprisingly these key quantum resources may be protected and even enhanced by the implementation of some special hybrid open quantum systems. Here, we aim to show how a dissipative atom-cavity-system can be accomplished to generate enhanced quantum resources.To do so, we consider a couple of dissipative cavities, where each one contains two effective two-level atoms interacting with a single-mode cavity field. In practical applications, a classical laser field may be applied to drive each atomic subsystem. After driving the system, a Bell-state measurement is performed on the output of the system to quantify the entanglement and coherence. The obtained results reveal that the remote entanglement and coherence between the atoms existing inside the two distant cavities are not only enhanced, but can be stabilized, even under the action of dissipation. In contrast, the local entanglement between two atoms inside each dissipative cavity attenuates due to the presence of unwanted environmental effects.Nevertheless, the local coherence may show the same behavior as the remote coherence.Besides, the system provides the steady state entanglement in various interaction regimes,particularly in the strong atom-cavity coupling and with relatively large detuning. More interestingly, our numerical analyses demonstrate that the system may show a memory effect due to the fact that the death and revival of the entanglement take place during the interaction. Our proposed model may find potential applications for the implementation of long distance quantum networks. In particular, it facilitates the distribution of quantum resources between the nodes of large-scale quantum networks for secure communication.

关键词： remote entanglement and coherence atomic dissipation steady state entanglement Bell-statemeasurement

维普期刊数据库