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Exact solutions to the angular Teukolsky equation with s≠0

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Communications in Theoretical Physics 2022年第11期74卷 1-15页

作者： chang-yuan Chen Xiao-Hua Wang yuan You Dong-Sheng Sun Fa-Lin Lu Shi-Hai Dong School of Physics and Electronic Engineering Yancheng Teachers UniversityYancheng224007China Research Center for Quantum Physics Huzhou UniversityHuzhou313000China Laboratorio de Información Cuántica CIDETECInstituto Politécnico NacionalUPALMC.P 07700CDMXMexico

We first convert the angular Teukolsky equation under the special condition ofτ≠0,s≠0,m=0 into a confluent Heun differential equation(CHDE)by taking different function transformation and variable *** then according to the characteristics of both CHDE and its analytical solution expressed by a confluent Heun function(CHF),we find two linearly dependent solutions corresponding to the same eigenstate,from which we obtain a precise energy spectrum equation by constructing a Wronskian *** that,we are able to localize the positions of the eigenvalues on the real axis or on the complex plane whenτis a real number,a pure imaginary number,and a complex number,respectively and we notice that the relation between the quantum number l and the spin weight quantum number s satisfies the relation l=∣s∣+n,n=0,1,2….The exact eigenvalues and the corresponding normalized eigenfunctions given by the CHF are obtained with the aid of *** features of the angular probability distribution(APD)and the linearly dependent characteristics of two eigenfunctions corresponding to the same eigenstate are *** find that for a real numberτ,the eigenvalue is a real number and the eigenfunction is a real function,and the eigenfunction system is an orthogonal complete system,and the APD is asymmetric in the northern and southern *** a pure imaginary numberτ,the eigenvalue is still a real number and the eigenfunction is a complex function,but the APD is symmetric in the northern and southern ***τis a complex number,the eigenvalue is a complex number,the eigenfunction is still a complex function,and the APD in the northern and southern hemispheres is also ***,an approximate expression of complex eigenvalues is obtained when n is greater than∣s∣.

关键词： angular Teukolsky equation linearly dependent Wronskian determinant

Targeting methyltransferase-like 5-mediated sphingomyelin metabolism:A novel therapeutic approach in gastric cancer

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World Journal of Gastrointestinal Oncology 2024年第10期16卷 4060-4063页

作者： Jin-Juan Zhang chang yuan Sheng-Chun Dang Department of General Surgery The Affiliated Hospital of Jiangsu UniversityZhenjiang 212001Jiangsu ProvinceChina

Gastric cancer(GC)is a global health problem and a leading cause of cancerrelated deaths,with its mortality rate ranking third among all *** etiology and progression of GC are characterized by a complex interplay of genetic and epigenetic changes,which present challenges for its early diagnosis and effective *** the mechanisms underlying the occurrence and development of GC and identifying novel biomarkers for early detection and prognosis are crucial to improving patient *** editorial examines the role of methyltransferase-like 5(METTL5)in the progression of GC through sphingomyelin metabolism by considering an article published by Zhang et al in the World Journal of Gastrointestinal Oncology in 2024,which is entitled“METTL5 promotes GC progression via sphingomyelin metabolism”.These authors investigated the biological behavior of METTL5 in GC by examining its expression patterns,clinical relevance,functional effect,and potential mechanisms,as well as its response to *** editorial provides valuable insights into the role of METTL5 in the progression of GC and its potential as a therapeutic target.

关键词： Gastric cancer Methyltransferase-like 5 Sphingomyelin metabolism Biomarkers Chemotherapy response

Optimization of reaction conditions for the electroleaching of manganese from low-grade pyrolusite

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International Journal of Minerals,Metallurgy and Materials 2015年第11期22卷 1121-1130页

作者： Xing-ran Zhang Zuo-hua Liu Xing Fan Xin Lian chang-yuan Tao College of Chemistry and Chemical Engineering Chongqing University Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization

In the present study, a response surface methodology was used to optimize the electroleaching of Mn from low-grade pyrolusite. Ferrous sulfate heptahydrate was used in this reaction as a reducing agent in sulfuric acid solutions. The effect of six process variables, including the mass ratio of ferrous sulfate heptahydrate to pyrolusite, mass ratio of sulfuric acid to pyrolusite, liquid-to-solid ratio, current density, leaching temperature, and leaching time, as well as their binary interactions, were modeled. The results revealed that the order of these factors with respect to their effects on the leaching efficiency were mass ratio of ferrous sulfate heptahydrate to pyrolusite 〉 leaching time 〉 mass ratio of sulfuric acid to pyrolusite 〉 liquid-to-solid ratio 〉 leaching temperature 〉 current density. The optimum conditions were as follows： 1.10：1 mass ratio of ferrous sulfate heptahydrate to pyrolusite, 0.9：1 mass ratio of sulfuric acid to pyrolusite, liquid-to-solid ratio of 0.7：1, current density of 947 A/m^2, leaching time of 180 min, and leaching temperature of 73°C. Under these conditions, the predicted leaching efficiency for Mn was 94.1%; the obtained experimental result was 95.7%, which confirmed the validity of the model.

关键词： pyrolusite manganese ore treatment electroleaching reaction conditions optimization

Simulation of ENA Imaging Measurements on a Geosynchronous Orbit

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空间科学学报 2022年第5期42卷 884-890页

作者： LU Li YU Qinglong ZHOU Ping JIA Shuai chang yuan Laboratory of Space Environment Exploration National Space Science CenterChinese Academy of SciencesBeijing 100190 Beijing Key Laboratory of Space Environment Exploration Beijing 100190 Key Laboratory of Science and Technology on Space Environment Situational Awareness Chinese Academy of ScienceBeijing 100049 Shanghai Institute of Satellite Engineering Shanghai 200240

Geosynchronous orbit is located in the ring current region,where the energetic particle emission environment challenges the ion deflection design limit of the Energetic Neutral Atom(ENA)***,there is no measurement record of ENA imaging in this area *** the basis of possessing the patent of high-energy ion deflection technology,ENA imaging under different Kp index in geosynchronous orbit is *** simulation images show the characteristics of low-altitude ENA emission source and the rough sketch of *** to the north-south conjugation observation of geosynchronous orbit,the simulated ENA images at different positions all have north-south *** at the unsolved problems,such as the input source of ring current energetic ions during geomagnetic activities and its evolution process,we analyzed the possible results of ENA imaging combined with in-situ particle measurements in the same satellite,as well as the subversion effect of any north-south asymmetry of ENA map on the inversion model.

关键词： Energetic Neutral Atom(ENA) Magnetosphere Ring current ENA imaging

Promoting electrocatalytic nitrogen reduction to ammonia via dopant boron on two-dimensional materials

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Rare Metals 2024年第10期43卷 5117-5125页

作者： Ya-Hui Cui Wen-Cheng Ouyang Ai-Jun Gao chang-yuan Yu Li-Peng Zhang State Key Laboratory of Organic-Inorganic Composites College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China College of Materials Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China College of Life Science and Technology Beijing University of Chemical TechnologyBeijing 100029China

Electrocatalytic nitrogen reduction reaction(NRR)is a key process for producing energy efficient and environment friendly ***-doped two-dimensional materials are highly promising as NRR ***,the interaction between doped boron and matrix materials on NRR catalytic performance is still unclear,which is limiting the development of catalysts containing boron for ***,NRR on different boron-doped twodimensional(2D)materials was explored by first principle *** is found that adsorption energy of intermediate*NNH(E*NNH)can be used as a descriptor to characterize the catalytic activity for ***-adsorbed black phosphorus(B-BP)is demonstrated showing excellent NRR catalytic activity and suppressing hydrogen evolution *** is disclosed that the excellent catalytic performance of boron-doped structures comes from a proper quantitatively electron transfer(0.8e)between nitrogen in*NNH and the active site boron *** work not only established a descriptor for NRR catalytic activity on B-doped 2D materials,but also screened out a potential NRR *** importantly,the intrinsic reason and mechanism of high catalytic activity of boron-doped structures were *** work provides a design principle for exploring high-performance NRR electrocatalysts containing boron.

关键词： Electrocatalytic nitrogen reduction reaction Boron-doped two-dimensional materials Descriptor Density functional theory

Approximate Analytical Solutions for Scattering States of D-dimensional Hulthen Potentials

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Communications in Theoretical Physics 2011年第3期55卷 399-404页

作者： CHEN chang-yuan SUN Dong-Sheng LIU Cheng-Lin LU Fa-Lin School of Physics and Electronics Yancheng Teachers University Yancheng 224002 China

Using the exponential function transformation approach along with an approximation for the centrifugal potential, the radial Schr6dinger equation of D-dimensional Hulthen potential is transformed to a hypergeometric differential equation. The approximate analytical solutions of scattering states are attained. The normalized wave functions expressed in terms of hypergeometrie functions of scattering states on the ＂k/2π scale＂ and the calculation formula of phase shifts are given. The physical meaning of the approximate analytical solutions is discussed.

关键词： D-dimensional Hulthen potential Schrodinger equation scattering states approximate analytical solutions

Unraveling the influence of surface roughness on oil displacement by Janus nanoparticles

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Petroleum Science 2023年第4期20卷 2512-2520页

作者： yuan-Hao chang Sen-Bo Xiao Rui Ma Zhi-Liang Zhang Jian-Ying He Department of Structural Engineering Norwegian University of Science and Technology(NTNU)7491TrondheimNorway

Janus nanoparticles(JNPs)possess great potential in recovering the residual oil from reservoirs,however,the fundamental interaction mechanisms among nanoparticles,the oil,and reservoir wall characteristics remain to be *** this work,models of oil trapping grooves with different geometric features are subjected to molecular dynamics simulations for investigating the influences of roughness parameters on oil displacement dynamics by *** key surface geometry parameters and different degrees of surface hydrophobicity are *** results indicate that JNPs hold an outstanding performance in displacing residual oil on weakly to moderately hydrophobic ***,smaller entry and exit angles,the larger aspect ratio of the oil trapping grooves,and a bigger tip length of the rough ridges lead to superior oil *** the key geometric parameters,the aspect ratio of the oil trapping grooves plays the dominant *** insights about the interaction of surface properties and JNPs and the resulting trapped oil displacement could serve as a theoretical reference for the application of JNPs for targeted reservoir conditions.

关键词： Janus nanoparticles Oil displacement Enhanced oil recovery Molecular dynamics simulation Rough surface

Safety of menstrual blood-derived stromal cell transplantation in treatment of intrauterine adhesion

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World Journal of Stem Cells 2020年第5期12卷 368-380页

作者： Qi-yuan chang Si-Wen Zhang Ping-Ping Li Zheng-Wei yuan Ji-Chun Tan Department of Obstetrics and Gynecology Shengjing Hospital of China Medical UniversityShenyang 110022Liaoning ProvinceChina Key Laboratory of Reproductive Dysfunction Diseases and Fertility Remodeling of Liaoning Province Shenyang 110004Liaoning ProvinceChina Key Laboratory of Health Ministry for Congenital Malformation Shengjing Hospital of China Medical UniversityBenxi 117004Liaoning ProvinceChina

BACKGROUND Intrauterine adhesion(IUA)can cause serious damage to women’s reproductive health,yet current treatment methods are difficult to achieve satisfactory *** our previous studies,we demonstrated that menstrual-derived stromal stem cells(MenSCs),with high proliferative capacity and self-renewal ability,have a powerful therapeutic effect in patients with severe ***,safety assessment of MenSCs transplantation is essential for its further *** To evaluate the short-,medium-,and long-term biosafety of MenSCs via intrauterine transplantation in a rat model of IUA,with a focus on toxicity and *** MenSCs were injected into the sub-serosal layer of the uterus in an IUA rat model,for 3 d,3 mo,and 6 mo separately,to monitor the corresponding acute,sub-chronic,and chronic *** rats of the same age served as negative *** effects were evaluated by body weight,organ weight,histopathology,hematology,and biochemistry *** of MenSCs was investigated in Balb/c-nu mice in vivo and by colony formation assays in *** Compared with the same week-old control group,all of the IUA rats receiving MenSC transplantation demonstrated no obvious changes in body weight,mainorgan weight,or blood cell composition during the acute,sub-chronic,and chronic observation *** the same time,serum biochemical tests showed no adverse effects on metabolism or liver and kidney *** 4 wk of subcutaneous injection of Men SCs in Balb/c-nu nude mice,no tumor formation or cell metastasis was ***,there was no tumor colony formation of Men SCs during soft agar culture in *** There is no acute,sub-chronic,or chronic poisoning,infection,tumorigenesis,or endometriosis in rats with IUA after Men SC *** above results suggest that intrauterine transplantation of Men SCs is safe for endometrial treatment.

关键词： Menstrual blood-derived stromal cells Endometrial treatment Intrauterine adhesion Stem cell transplantation Biosafety Toxicity

Preparation of Uniform Ni-B Amorphous Alloy Catalyst on CNTs and its Performance for Acetylene Selective Hydrogenation

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Chinese Chemical Letters 2006年第1期17卷 109-112页

作者： chang yuan HU Feng Yi LI Rong Bin ZHANG Li HUA Department of Chemistry Nanchang University Nanchang 330047

Uniform Ni-B amorphous alloys about 14 nm have been prepared on CNTs-A support,named Ni-B/CNTs-A. In comparison with the Ni-B/CNTs amorphous catalyst, Ni-B/CNTs-A showed higher nickel loading, determined by ICP and be... 详细信息

关键词： CNTs aniline Ni-B amorphous alloy catalyst acetylene selective hydrogenation.