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First extraction of the proton mass radius and scattering length |αρ0p|from ρ^(0) photoproduction

Science China(Physics,Mechanics & Astronomy) 2023年第3期66卷 98-103页

作者： xiao-yun wang Fancong Zeng Quanjin wang Li Zhang Department of Physics Lanzhou University of TechnologyLanzhou 730050China Lanzhou Center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu ProvinceLanzhou UniversityLanzhou 730000China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

As it involves the lightest physical states excited from the vacuum by the vector quark current,near-threshold ρ^(0)photoproduction is considered a possible way to research the proton radius and the absolute value of the scattering lengths of the ρ^(0)-proton *** this study,under the assumption of a scalar form factor of dipole form,the value of the proton mass radius is calculated as(0.85±0.06) fm by fitting the differential cross section of the γp→ρ^(0)p reaction at near-threshold *** light vector meson photoproduction,because the exchange of a scalar quark-antiquark pair is not suppressed and should dominate the scalar gluon exchange,the radius we extract from ρ^(0)photoproduction is likely to represent the quark radius of the *** fact may explain why the value obtained in this study is very near the proton charge ***,the absolute value of the ρ^(0)-proton scattering length |αρ^(0)p|=(0.31±0.06) fm is obtained for the first time within the vector meson dominance *** result disobeys the rule that the absolute value of the vector meson and proton scattering length |αVp| increases with the meson’s mass,which can be attributed to treating the ρ^(0)meson as a point in the *** results provide useful theoretical information for an in-depth understanding of proton structure and the proton-vector meson interaction.

关键词： nucleon radius scattering length gravitational form factor meson photoproduction

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Hand-assisted laparoscopic splenectomy is a useful surgical treatment method for patients with excessive splenomegaly: A metaanalysis

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World Journal of Clinical Cases 2019年第3期7卷 320-334页

作者： Yong Huang xiao-yun wang Kai wang Department of General Surgery Hepato-Biliary-Pancreatic Surgery Division The Second Affiliated Hospital of Nanchang University Department of Operating Room The Second Affiliated Hospital of Nanchang University

BACKGROUND Hand-assisted laparoscopic splenectomy(HALS) can help overcome the drawbacks of laparoscopic splenectomy(LS) while maintaining its *** To evaluate the efficacy and advantages of HALS for *** The relevant literature was reviewed using the PubMed, EMBASE, Cochrane,Ovid Medline, and Wanfang databases to compare the clinical outcomes of HALS and LS. Odds ratios or mean differences were calculated with 95% confidence intervals for fixed-effects and random-effects models. Overall, 754 patients from16 trials who met the inclusion criteria were *** In pure splenectomy, blood loss volume(P < 0.001) and conversion rate(P =0.008) were significantly lower in the HALS group than in the LS ***, for splenomegaly, the operative time(P = 0.04) was shorter and blood loss volume(P < 0.001) and conversion rate(P = 0.001) were significantly lower in the HALS group than in the LS group. However, no significant difference was observed in hospital stay length, blood transfusion, time to food intake, complications, or mortality rate between the two groups. Moreover, in splenectomy and devascularization of the upper stomach(DUS), the operative time(P = 0.04) was significantly shorter and blood loss volume(P < 0.001) andconversion rate(P = 0.05) were significantly lower in the HALS + DUS group than in the LS + DUS group. However, no significant difference was observed in hospital stay length, timing of diet, and complications between the two *** HALS is an ideal surgical treatment method for splenomegaly because it can maximize the benefits for patients while maintaining the advantages of LS.

关键词： Hand-assisted Laparoscopic Splenectomy Splenomegaly Devascularization

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Pion-induced K^* production with Σ^* baryon off proton target

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Communications in Theoretical Physics 2020年第11期72卷 74-79页

作者： Jie Xiang xiao-yun wang Hao Xu Jun He Lanzhou University of Technology Lanzhou 730050China Department of Physics Lanzhou University of TechnologyLanzhou 730050China Department of Applied Physics School of ScienceNorthwestern Polytechnical UniversityXi’an 710129China Department of Physics and Institute of Theoretical Physics Nanjing Normal UniversityNanjingJiangsu 210097China

In this work,the reactionπ-p→K^*Σ^*is investigated with an effective Lagrangian *** contributions from the Born terms,including the s,t,and u channel,are considered,and the Regge model and the Feynman model are applied to treat the t-channel *** existing experimental data can be reproduced with the best-fittedχ^2 being 2.38 and 1.54 for the Feynman and Regge models,***,it is found that the contribution from the t channel is dominant in the *** contribution of the u channel is mainly distributed at backward angles,and the contribution from the s channel is small and *** the Feynman model,the contribution of the t-channel K exchange is much larger than the contribution of the K^*exchange,while in the Regge model the contribution of the t-channel K exchange is comparable to that of the K^**** about the differential crosssection of theπ-p→K^*Σ^*reaction is also presented,which is helpful for clarifying the role of the Regge *** current results suggest high-precision experimental measurements which can be performed at J-PARC and COMPASS.

关键词： effective Lagrangian approach Regge model hadron states

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Biochemical Properties and Inhibition Kinetics of Phosphatase from Wheat Thylakoid Membranes

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Journal of Integrative Plant Biology 2006年第3期48卷 294-299页

作者： Mei-Juan Fei Jian-Sheng Chen xiao-yun wang College of Life Sciences Shandong Agricultural University Taian 271018 China Shandong Key Laboratory of Crop Biology Shandong Agricultural University Taian 271018 China

A phosphetase that hydrolyses phosphate monoesters has been Isolated from wheat thylakold membranes. Biochemical properties and inhibition kinetics of the phosphatase were Investigated using several Ions, organlc solvents, and Inhlbltors. Wheat （Trltlcum aestivum L. cv. PH82-2-2） thylakold membrane phosphatase activity was activated by Mg^2＋, Ca^2＋, and Fe^2＋ and was inhibited by Mn^2＋ and Cu^2＋. For example, enzyme activity was acUvated 34.81% by 2 mmol/l. Mg^2＋, but was Inhibited 22.3% and 8.5% by 2 and 1 mmol/L Cu^2＋, respectively. Methanol, ethanol and glycol were all able to activate enzyme activity. Enzyme activity was activated 58.5%, 48.2%, and 8.7% by 40% ethanol, methanol and glycol, respectively. From these results, It can be seen that the degree of actlvetlon of the phosphetase was greatest for ethanol and the type of acUvatlon was uncompetltlve. Moreover, the activity of the thylakold membrane phosphetase was Inhibited by molybdate, vanadete, phosphate, and fluoride and the type of Inhibition produced by these elements was uncompetltlve, non-competitive, competltlve and mixed, respectively.

关键词： calcium ions copper enzyme activity enzyme inhibitors enzymes ethanol ferric ions fluoride glycols ions kinetics magnesium manganese methanol molybdates phosphate phosphoric monoester hydrolases solvents thylakoids wh eat

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Inhibitory effect of Houttuynia cordata Thunb on LPS-induced retinal microglial activation

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International Journal of Ophthalmology(English edition) 2019年第7期12卷 1095-1100页

作者： Ying-Hui Zhang Le-Meng Ren xiao-yun wang The Second Hospital of Shandong University Shandong UniversityJinan 250033 Shandong ProvinceChina The First Clinical Medical College Lanzhou UniversityLanzhou 730000 Gansu ProvinceChina

AIM: To identify the effect of Houttuynia cordata Thunb(HCT) on lipopolysaccharide(LPS)-induced microglial activation and investigate its possible molecular mechanisms. METHODS: The primary retinal microglial cells were cultured from the retinas of newborn Sprague-Dawley rats and exposed to LPS, and/or HCT with different concentrations. The survival ability of retinal microglia cells was tested by standard MTT method. BrdU cell proliferation assay was used to evaluate the proliferation of retinal microglia. Inflammatory factors in the culture supernatants, including TNF-α, iNOS and IL-1β, were measured using ELISA. Microglia cells’ migration was determined with Transwell migration assay. The total p38-MAPK and phosphorylation of p38-MAPK(p-p38-MAPK) were detected with Western ***: Primary retinal microglia in culture exposed to LPS to induce microglia activation. Pretreatment with HCT significantly inhibited the LPS-induced cell proliferation, but not the cell viability. LPS induced inflammatory reaction in microglia and cell migration. HCT significantly reduced LPS-stimulated release of pro-inflammatory factors and decreased the number of migrating cells substantially in a concentration-dependent manner. Moreover, the protein levels of p-p38 MAPK were identified as the up regulation and co-treatment with HCT obviously inhibited the upregulation of p-p38 MAPK, but had no effect on the levels of total ***: The data suggest that HCT inhibits LPSinduced retinal microglial activation via suppression of the p-p38-MAPK. HCT may be used for the treatment of ocular diseases characterized by over-activated microglia.

关键词： Houttuynia cordata Thunb microglia activation retina inhibitory effect

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Production of vector mesons in pentaquark state resonance channel in p-A ultraperipheral collisions

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Chinese Physics C 2021年第1期45卷 280-285页

作者： Ya-Ping Xie xiao-yun wang Xurong Chen Institute of Modem Physics Chinese Academy of SciencesLanzhou 730000China Department of physics Lanzhou University of TechnologyLanzhou 730050China University of Chinese Academy of Sciences Beijing 100049China Institute of Quantum Matter South China Normal UniversityGuangzhou 510006China

Ultraperipheral collisions(UPCs) of protons and nuclei are important for the study of the photoproduction of vector mesons and exotic *** photoproduction of vector mesons in the pentaquark resonance channel in p-Au UPCs at the Relative Heavy Ion Collider(RHIC) and p-Pb UPCs at the Large Hadron Collider(LHC) is investigated by employing the STARlight *** cross sections of vector mesons via the pentaquark state resonance channel are obtained using the effective Lagrangian *** pseudo-rapidity and rapidity distributions of J/Ψ and γ(1 S) are given for p-Au UPCs at the RHIC and p-PbUPCs at the *** is found that the RHIC is a better platform for discovering pentaquark states than the ***,Pb(11080) is easier to identify than PC(4312) because the background of γ(1 S) is weaker than that of J/Ψ in the t-channel at the RHIC.

关键词： ultraperipheral collisions pentaquark states photoproduction

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Effects of the dust size distribution in one-dimensional quantum dusty plasma

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Frontiers of physics 2015年第5期10卷 69-74页

作者： Juan-Fang Han Dong-Ning Gao Heng Zhang xiao-yun wang Wen-Shan Duan College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070 China Department of Mathematics and Physics Lanzhou Jiao Tong University Lanzhou 730070 China

The effects of the dust size distribution in ultracold quantum dusty plasmas are investigated. The amplitude φm and width ω of quantum dust acoustic waves are studied with different dust size distributions in the system. The φm and ω of the quantum dust acoustic waves are found to increase as the total number density increases. The φm and ω are greater for unusual dusty plasmas than for typical dusty plasmas. Moreover, as the Fermi temperature of the dust grains increases, the φm of the wave decreases. The ω of quantum dust acoustic waves increases as the speed u0 of the wave increases

关键词： dusty plasma electrostatic waves

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THE EFFECT OF OIL CAVITY DEPTH ON TEMPERATURE FIELD IN HEAVY HYDROSTATIC THRUST BEARING

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Journal of Hydrodynamics 2011年第5期23卷 676-680页

作者： SHAO Jun-peng DAI Chun-xi ZHANG Yan-qin YU xiao-dong XU xiao-qiu wang yun-fei College of Mechanical and Power Engineering Harbin UniverSity of Science and Technology Harbin150080 China

For a heavy hydrostatic bearing with a high linear velocity, the results of numerical calculations often differ from practical conditions if the viscosity is considered as constant. In this article, the influence of the oil cavity depth on the temperature field in the heavy hydrostatic bearing is discussed in the context of variable viscosity. The viscosity-temperature relations for the gap oil film are first established by fitting B-Spline curves, then, numerical calculations for the temperature field in the heavy hydrostatic bearing of different oil cavity depths are carried out based on Finite Volume Method （FVM） under the same rotating speed, and the influence of the oil cavity depth on the temperature distribution in the gap oil film of the hydrostatic bearing is discussed. The results of numerical calculations provide the temperature distribution state inside the hydrostatic bearing, which would help the selection and the design of hydrostatic bearings in engineering practice.

关键词： hydrostatic thrust bearing viscosity-temperature characteristic Finite Volume Method (FVM) temperature field

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Unraveling the macroevolution of horseshoe bats(Chiroptera: Rhinolophidae: Rhinolophus)

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Zoological Research 2023年第1期44卷 169-182页

作者： Wei-Jian Guo Yi Wu Kai He Yi-Bo Hu xiao-yun wang Wen-Hua Yu Key Laboratory of Conservation and Application in Biodiversity of South China School of Life SciencesGuangzhou UniversityGuangzhouGuangdong 510000China CAS Key Laboratory of Animal Ecology and Conservation Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China

Unraveling the diversification mechanisms of organisms is a fundamental and important macroevolutionary question regarding the diversity,ecological niche, and morphological divergence of life. However, many studies have only explored diversification mechanisms via isolated factors. Here,based on comparative phylogenetic analysis, we performed a macroevolutionary examination of horseshoe bats(Chiroptera: Rhinolophidae:Rhinolophus), to reveal the inter-relationships among diversification, intrinsic/extrinsic factors, and climatic ecological niche characteristics. Results showed a general slowing trajectory during diversification, with two dispersal events from Asia into Southeast Asia and Africa playing key roles in shaping regional heterogeneous diversity. Morphospace expansions of the investigated traits(e.g., body size,echolocation, and climate niche) revealed a decoupled pattern between diversification trajectory and trait divergence, suggesting that other factors(e.g., biotic interactions) potentially played a key role in recent diversification. Based on ancestral traits and pathway analyses, most Rhinolophus lineages belonging to the same region overlapped with each other geographically and were positively associated with the diversification rate, implying a competitive prelude to speciation. Overall, our study showed that multiple approaches need to be integrated to address diversification history. Rather than a single factor, the joint effects of multiple factors(biogeography, environmental drivers, and competition) are responsible for the current diversity patterns in horseshoe bats, and a corresponding multifaceted strategy is recommended to study these patterns in the future.

关键词： Diversification Rhinolophus Historical biogeography Abiotic/Biotic factors Climatic niche characteristics Competition

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Essential oil of Actinidia macrosperma, a catnip response kiwi endemic to China

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2006年第9期7卷 708-712页

作者： ZHAO yun-peng wang xiao-yun wang Zhi-can LU Yin FU Cheng-xin CHEN Shao-yuan Research Program for Medicinal Plant Resource Lab of Systematic ＆ Evolutionary Botany and Biodiversity School of Life Sciences Zhejiang University Hangzhou 310058. China

Objective: To identify compounds that may be responsible for catnip response of Actinidia macrosperma, and compare chemical compositions in the wild and in vitro regenerated plants. Methods: GC-MS and relative retention indices with n-alkanes as reference points were used for compound identification, and component relative percentage was calculated based on GC peak areas without using correction factors. Results: There are 28 compounds (92.72%) and 15 compounds (93.88%) identi- fied in the essential oils from the wild and regenerated plants, respectively. Dihydronepetalactone, iridomyrmecin, and dihydro- actinidiolide, which are believed to be attractive to felines, are present in both wild and regenerated plants. Actinine was not detected, and beta-pheylethyl alcohol was only present in wild plant. In addition, short-chain enol derivatives, messengers in chemical communication, are commonly present in wild plant of A. macrosperma, but absent in regenerated one. Conclusion: Dihydronepetalactone, iridomyrmecin, and dihydroactinidiolide are responsible for the catnip response of A. macrosperma.

关键词： Actinidia macrosperma GC-MS Dihydronepetalactone lridomyrmecin Dihydroactinidiolide Catnip response

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