检索结果-南通市图书馆

An Initial Analysis of a Strongly Lensed QSO Candidate Identified by LAMOST

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2023年第10期23卷 349-356页

作者： y.h.Chen M.y.Tang h.Shu h.Tu Institute of Astrophysics Chuxiong Normal UniversityChuxiong 675000China School of Physics and Electronical Science Chuxiong Normal UniversityChuxiong 675000China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of SciencesKunming 650011China Department of Astronomy Yunnan Universityand Key Laboratory of Astroparticle Physics of Yunnan ProvinceKunming 650091China Physics Department&Shanghai Key Lab for Astrophysics Shanghai Normal UniversityShanghai 200234China

From 2011 to 2021,LAMOST has released a total of 76,167 quasar *** try to search for gravitationally lensed QSOs by limiting coordinate differences and redshift differences of these *** name,brightness,spectrum,photometry and other information of each QSO will be visually checked *** attention should be paid to check whether there are groups of galaxies,gravitationally lensed arcs,Einstein crosses,or Einstein rings near the *** careful selection,we select LAMOST J160603.01+290050.8(A)and LAMOST J160602.81+290048.7(B)as a candidate and perform an initial *** A and B are336 apart and they display blue during photometric *** redshift values of components A and B are0.2%different,their Gaia_g values are 1.3%different,and their ugriz values are 1.0%or less *** the spectra covering from 3690 to 9100?,the emission lines of C II,Mg,hγ,OⅢ,and hβare present for both components A and B and the ratio of flux(B)to flux(A)from LAMOST is basically a constant,around ***,no galaxies have been found between components A and *** et *** them as binary *** we accidentally find a galaxy group near components A and *** the center of dark matter in the galaxy group is at the center between components A and B,components A and B are probably gravitationally lensed *** estimate that the Einstein mass is 1.46×10^(11)M_⊙and the total mass of the lens is1.34×10^(13)M_⊙.The deflection angle is 197 at positions A and B and the velocity dispersion is 261 km s^(-1).Theoretically,this candidate could be a pair of fold images of a strong lensing system by a galaxy group,and we will investigate the possibility when the redshifts of nearby galaxies are available.

关键词： gravitational lensing:strong (galaxies:)quasars:individual(LAMOST J1606+2900) techniques:imaging spectroscopy

Correction of the Littlest higgs Model to higgs Production Process e-γ→veW-h in e-γ Collisions

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2007年第4X期48卷 699-704页

作者： LIU yao-Bei du Lin-Lin WANG Xue-Lei henan Institute of Science and Technology Xinxiang 453003 China College of Physics and Information Engineering Henan Normal University Xinxiang 453007 China

The littlest higgs model is the most economical one among various little higgs models. In the context of the littlest higgs （Lh） model, we study the process e-γ → veW^-h and calculate the contributions of the Lh model to the cross section of this process. The results show that in most of the parameter spaces preferred by the electroweak precision data, the value of the relative correction is larger than 10%. Such correction to the process e-γ →veW^-h is large enough to be detected via e-γ collisions in the future high energy linear e^＋ e^- collider （ILC） experiment with the c.m. energy √s = 500 GeV and a yearly integrated luminosity ￡ = 100fb^-1, which will give an idea/way to test the model.

关键词： littlest higgs model higgs boson cross section

A hOMOTOPy METhOD OF SWITChING SOLUTION BRANChES AT ThE PITChFORK BIFURCATION POINT

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2001年第3期19卷 299-308页

作者： Cong, y.-h. Zhu, Z.-y. College of Mathematical Sciences Shanghai Teachers University Shanghai 200234 China

Provides information on a study which proposed a continuation method for switching solution branches at a pitchfork point. Problem of the standard pitchfork; Information on the systems of equations; Numerical examples... 详细信息

关键词： homotopy method switching solution branches pitchfork point

In-hospital direct costs for thromboembolism and bleeding in Chinese patients with atrial fibrillation

在线全文

学校读者我要写书评

暂无评论

Chronic Diseases and Translational Medicine 2018年第2期4卷 127-134页

作者： San-Shuai Chang Jia-hui Wu yi Liu Ting Zhang Xin du Jian-Zeng Dong Gregory y.h. Lip Chang-Sheng Ma Department of Cardiology Beijing Anzhen HospitalCapital Medical UniversityNational Clinical Research Centre for Cardiovascular DiseasesBeijing 100029China Department of Cardiology Xuzhou Center HospitalXuzhouJiangsu 221000China University of Birmingham Institute of Cardiovascular Sciences City HospitalBirmingham B18 7QHUnited Kingdom

Objective: Limited data are available on the direct costs of hospitalization owing to thromboembolism and bleeding in patients with atrial fibrillation (AF) in China. Such data are essential for policy development, service planning, and cost-effectiveness analysis of new therapeutic strategies. This study aimed to provide detailed data regarding in-hospital direct costs for these pa-tients, compare the costs at different scenarios, and identify independent factors that may predict the costs. Methods: We collected data regarding in-hospital direct costs among patients with AF who were hospitalized owing to ischemic stroke (IS), transient ischemic attack (TIA), intracranial hemorrhage (ICh), or major gastrointestinal bleeding. All data were collected from 7 representative tertiary referral hospitals and 3 secondary care hospitals from December 2009 to October 2014. Results: In total, 312 eligible patients with thromboembolism and 143 patients with major bleeding were identified, and their hospital charts were reviewed. The median in-hospital direct costs were 17,857 Chinese yuan (CNy) for IS and 16,589 CNy for TIA (equivalent to 2907 US dollars and 2701 US dollars, respectively). For patients with major bleeding, the costs were 27,924 CNy for ICh and 18,196 CNy for major gastrointestinal bleeding (equivalent to 4546 US dollars and 2962 US dollars, respec-tively). The direct costs were mainly driven by medications, which accounted for approximately 33.4%-36.1% in different groups of patients. The direct costs were highly related to the hospital level and National Institutes of health Stroke Scale scores in patients with thromboembolism; in patients with ICh, the factors included hospital level, warfarin treatment before admission, and prior hospitalization for stroke. Conclusions: Given the high prevalence, AF-related thromboembolism and bleeding impose considerable economic burden on the Chinese society. Efforts to improve the management of AF may confer substantial e

关键词： Atrial fibrillation Ischemic stroke Bleeding In-hospital direct costs

Pre-reduction of WO_(3)-Co_(3)O_(4)by.h.(2)-C_(2)h_4 in a fluidized bed

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2024年第2期66卷 273-284页

作者： huijun Shang hengli Li Weijun Li Feng Pan Zhan du State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of Sciences(CAS)Beijing 100190China College of Chemical Engineering Nanjing Technology UniversityNanjing 211816China School of Chemistry and Chemical Engineering Shihezi UniversityShihezi 832003China College of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China Chinalco Environmental Protection and Energy Conservation Group Co. Ltd.Xiong’an 071700China

In order to avoid the formation ofηphase(W_(6)Co_(6)C or W_(3)Co_(3)C)that adversely affects the sintering process and its products in the preparation process of ultra-fine WC-Co powder,a technical route of prereduction of WO_(3)-Co_(3)O_(4)to WO_(2)-Co and then deep reduction carbonization to WC-Co powder has been *** study mainly investigates the influence of gas partial pressure on the pre-reduction process of WO_(3)-Co_(3)O_(4)under a mixed atmosphere of h_(2)-C_(2)h_(4)-Ar at 600℃and establishes the kinetic equations of pre-reduction and carbon *** results indicate that increasing the partial pressure of hydrogen is conducive to the rapid and complete conversion of WO_(3) to WO_(2).high carbon content can be generated by the deposition of C_(2)h_(4),and it hinders the diffusion of the reducing gas;WO_(3)still cannot be completely reduced to WO_(2)as the partial pressure of C_(2)h_(4) increases to 60%.For the carbon evolution of C_(2)h_(4),the carbon amount is positively related to the h_(2)partial pressure,but it shows the highest amount and evolution rate when the ethylene partial pressure is 20%.Based on the reduction rate curves of WO_(3) and carbon evolution rate curves of C_(2)h_(4),the rate equations of pre-reduction and carbon evolution of WO_(3)-Co_(3)O_(4)system at 600℃are *** pre-reduction reaction belongs to the first-order reaction,and its equation is expressed as follows:r=-(dw_(WO_(3)))/dt=(9±0.15)×10^(-2)×P_(h_(2))^(0.44)P_(C_(2)h_(4))&(0.57)The carbon deposition rate equation of C_(2)h_(4) can be expressed as follows:r=-(dc_C)/dt=r_f-r_b≌7.35×10^(-2)×P_(C_(2)h_(4))^(0.31)

关键词： Fluidization WO_(3)-Co_(3)O_(4) Reduction Carbon deposition Rate equation

PROMOTIONAL EFFECT OF BISMUTh AS DOPANT IN BI-DOPED VANADyL PyROPhOSPhATE CATALySTS FOR SELECTIVE OXIDATION OF N-BUTANE TO MALEIC ANhyDRIDE

在线全文

学校读者我要写书评

暂无评论

PROMOTIONAL EFFECT OF BISMUTH AS DOPANT IN BI-DOPED VANADYL ...

Ordering-induced Elinvar effect over a wide temperature range in a spinodal decomposition titanium alloy

40th IUPAC Congress

作者： y.h. Taufiq-yap y. Kamiya K.P. Tan Department of Chemistry Universiti Putra Malaysia43400 UPM SerdangSelangorMalaysia. Graduate School of Environmental Earth Science Hokkaido UniversitySapporo 060-0810Japan. Department of Chemistry Universiti Putra Malaysia43400 UPM SerdangSelangorMalaysia.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第19期150卷 245-255页

作者： D.L.Gong h.L.Wang S.h.hao P.Liu X.yang y.N.Jiang W.J.Wang K.Lin B.Li K.du y.D.Wang R.yang y.L.hao Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China School of Mechanical Engineering Dongguan University of TechnologyDongguan 523808China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Analysis and Testing Center Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Solid State ChemistryDepartment of Physical ChemistryUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

Temperature-independent elastic modulus is termed as Elinvar effect,which is available by tuning the continuous spin transition of ferromagnetic alloys via composition optimization and the first-order martensitic transformation of shape memory alloys via plastic ***,these reversible mechanisms are restricted generally in a narrow temperature range of less than 300 *** reports,by tuning a spinodal decomposition in a Ti-Nb-based titanium alloy via aging treatment,both the Elinvar effect in a wide temperature range of about 500 K and a high strength-to-modulus ratio of about 1.5%can be obtained by a continuous and reversible crystal ordering *** results demonstrate that the alloy aged at 723 K for 4 h has a nanoscale plate-like modulatedβ+α"two-phase microstructure and its elastic modulus keeps almost constant from 100 to 600 *** and in-situ X-ray diffraction measurements reveal that the crystal ordering parameter of theα"phase increases linearly with temper-ature from 0.88 at 133 K to 0.97 at 523 K but its volume fraction keeps a constant of about 33.8%.This suggests that the continuous ordering of theα"phase toward the high modulusαphase induces a posi-tive modulus-temperature relation to balance the negative relation of the elastically stableβ*** aged alloy exhibits a high yield strength of 1200 MPa,good ductility of 16%and a high elastic admissible strain of 1.5%.Our results provide a novel strategy to extend the Elinvar temperature range and enhance the strength by tuning the crystal ordering of decomposition alloys.

关键词： Titanium alloy Spinodal decomposition Crystal ordering Elinvar effect Mechanical properties

PhlCl_(2)/Nh_(4)SCN-Mediated Oxidative Regioselective Thiocyanation of Pyridin-2(1h)-ones

维普期刊数据库评论

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 Journal of Chemistry 2021年第9期39卷 2536-2546页

作者： Shanqing Tao Jiaxi Xiao yadong Li Fengxia Sun yunfei du Tianjin Key Laboratory for Modern Drug Delivery.h.gh-Efficiency School of Pharmaceutical Science and TechnologyTianjin UniversityTianjin 300072China College of Chemical and Pharmaceutical Engineering Hebei University of Science and TechnologyHebei Research Center of Pharmaceutical and Chemical EngineeringShijiazhuangHebei 050018China

The reaction of pyridin-2(1h)·ones with PhlCl_(2) and Nh_(4)SCN enables an efficient regioselective thiocyanation,leading to the synthesis of the biologically interesting C5 thiocyanated 2-pyridones in good to high *** mechanistic pathway of this metal-free approach is postulated to involve the formation of the reactive thiocyanogen chloride from the reaction of PhlCl_(2) and Nh4SCN followed with the regioselective electrophilic thiocyanation of the pyridin-2(1h)-one ring.

关键词： Pyridone PhlCl_(2) Thiocyanogen chloride Regioselective Electrophilic thiocyanation

The Log-Concavity of Kazhdan-Lusztig Polynomials of Uniform Matroids

维普期刊数据库评论

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 Systems Science & Complexity 2023年第1期36卷 117-128页

作者： XIE Matthew h y ZhANG Philip B College of Science Tianjin University of TechnologyTianjin 300384China College of Mathematical Science Tianjin Normal UniversityTianjin 300387China

Elias,et al.(2016)conjectured that the Kazhdan-Lusztig polynomial of any matroid is *** by a computer proof of Moll’s log-concavity conjecture given by Kauers and Paule,the authors use a computer algebra system to pr... 详细信息

关键词： holonomicFunctions Kazhdan-Lusztig polynomial log-concavity uniform matroid