Loading [MathJax]/extensions/TeX/noErrors.js
按提交时间
按主题分类
按作者
按机构
  • Exploring the multiplicity dependence of the flavor hierarchy for hadron productions in high energy pp collisions

    分类: 物理学 >> 核物理学 提交时间: 2025-01-19

    摘要: In this work, we perform a systematic study on the multiplicity dependence of hadron productions at mid-rapidity ($|y|<0.5$), ranging from the light to the charm sector in pp collisions at $\sqrt{s}=13$ TeV. This study utilizes a multi-phase transport model (AMPT) coupled with PYTHIA8 initial conditions. We have investigated the baryon to meson ratios as well as the strange to non-strange meson ratios varying with the charged particle density. By tuning the coalescence parameters, the AMPT model provides a reasonable description to the experimental data for inclusive productions of both light and charm hadrons, comparable to the string fragmentation model calculations with color reconnection effects. Additionally, we have analyzed the relative production of hadrons by examining self-normalized particle ratios as a function of the charged hadron density. Our findings suggest that parton evolution effects and the coalescence hadronization process in AMPT model lead to a strong flavor hierarchy in the multiplicity dependence of the baryon to meson ratio. Furthermore, our investigation on the $p_T$ differential double ratio of baryon to meson fraction between high and low multiplicity events indicates distinct modifications to the flavor associated baryon to meson ratio $p_T$ shape in high multiplicity events when comparing the coalescence hadronization model to the color reconnection model. These observations highlight the importance of understanding the hadronization process in high-energy proton-proton collisions through a comprehensive multiplicity dependent multi-flavor analysis.

  • Exploring the multiplicity dependence of the flavor hierarchy for hadron productions in high energy pp collisions

    分类: 物理学 >> 核物理学 提交时间: 2025-01-04

    摘要: In this work, we perform a systematic study on the multiplicity dependence of hadron productions at mid-rapidity ($|y|<0.5$), ranging from the light to the charm sector in pp collisions at $\sqrt{s}=13$ TeV. This study utilizes a multi-phase transport model (AMPT) coupled with PYTHIA8 initial conditions. We have investigated the baryon to meson ratios as well as the strange to non-strange meson ratios varying with the charged particle density. By tuning the coalescence parameters, the AMPT model provides a reasonable description to the experimental data for inclusive productions of both light and charm hadrons, comparable to the string fragmentation model calculations with color reconnection effects. Additionally, we have analyzed the relative production of hadrons by examining self-normalized particle ratios as a function of the charged hadron density. Our findings suggest that parton evolution effects and the coalescence hadronization process in AMPT model lead to a strong flavor hierarchy in the multiplicity dependence of the baryon to meson ratio. Furthermore, our investigation on the $p_T$ differential double ratio of baryon to meson fraction between high and low multiplicity events indicates distinct modifications to the flavor associated baryon to meson ratio $p_T$ shape in high multiplicity events when comparing the coalescence hadronization model to the color reconnection model. These observations highlight the importance of understanding the hadronization process in high-energy proton-proton collisions through a comprehensive multiplicity dependent multi-flavor analysis.

  • Multiple Mutation Strategies Differential Evolution With the Best Individuals Allocated to the Best Performer Among the Strategies

    分类: 计算机科学 >> 计算机科学的集成理论 提交时间: 2024-12-10

    摘要: Real parameter single objective optimization has been a prominent field for these decades. Recently, long-term search of real parameter single objective optimization is widely concerned based on the fact that solving difficulty always scales exponentially with the increase of dimensionality of solution space. So far, a number of population-based metaheuristics have been proposed. Among the algorithms, IMODE - a differential evolution algorithm based on three mutation strategies and the binomial or exponential crossover - demonstrates good performance. In this paper, based on IMODE, we propose multiple mutation strategies Differential Evolution with the Best Individuals allocated to the Best performer among the Strategies - BIBSDE - by revising IMODE. Altogether, we make five revisions in algorithm behavior and a change in parameter setting. The most important revision is that, during execution, for the next generation, the current best individuals are allocated to the best performer among the three mutation strategies as reward. Experimental results show that our BIBSDE performs better or at least not worse than existing population based metaheuristics for long-term search. Besides, each measure proposed by us is effective for enhancement.

  • Research on the Consumption and Development of Film Spin-offs under the Fan Economy——Take

    分类: 数字出版 >> 数字技术 提交时间: 2023-07-23

    摘要: Based on the fan economy and transmedia storytelling theory, this paper takes "The Wandering Earth 2" as the research object, and uses the research method of questionnaire survey to grasp the problems and enlightenment in the current consumption and development process of film spin-offs. Through questionnaire survey, it is found that fans' recognition and liking of spin-offs will affect their purchase intention, while the degree of restoration and value proximity of movie spin-offs will affect the recognition and love of fans. At the same time, it is found that there are a variety of problems in the transformation process from film content to spin-offs, and enlightenment is obtained for the problems: film content spin-offs should convey the core value of films, restore the image in the movie, develop spin-offs before the planning stage of the film, maximize publicity to ensure the smooth flow of information and sales channels, and focus on emotional connection with fans.

  • Investigating the pion emission source in pp collisions using the AMPT model with sub-nucleon structure

    分类: 物理学 >> 核物理学 提交时间: 2025-01-22

    摘要: The measurement of momentum correlations of identical pions serves as a fundamental tool for probing the space-time properties of the particle emitting source created in high-energy collisions. Recent experimental results have shown that, in pp collisions, the size of the one-dimensional primordial source depends on the transverse mass (\mt) of hadron pairs, following a common scaling behavior, similar to that observed in Pb--Pb collisions. In this work, a systematic study of the \pipi source function and correlation function is performed using the multiphase transport model (AMPT) to understand the properties of the emitting source created in high multiplicity pp collisions at $\sqrt{s}=13$ TeV. The \mt scaling behavior and pion emission source radii measured by ALICE experiment can be well described the model with sub-nucleon structure. These studies shed new light on the understanding of the effective size of the \pipi emission source and on studying the intensity interferometry in small systems with a transport model.

  • Investigating the pion emission source in pp collisions using the AMPT model with sub-nucleon structure

    分类: 物理学 >> 核物理学 提交时间: 2025-01-19

    摘要: The measurement of momentum correlations of identical pions serves as a fundamental tool for probing the space-time properties of the particle emitting source created in high-energy collisions. Recent experimental results have shown that, in pp collisions, the size of the one-dimensional primordial source depends on the transverse mass (\mt) of hadron pairs, following a common scaling behavior, similar to that observed in Pb--Pb collisions. In this work, a systematic study of the \pipi source function and correlation function is performed using the multiphase transport model (AMPT) to understand the properties of the emitting source created in high multiplicity pp collisions at $\sqrt{s}=13$ TeV. The \mt scaling behavior and pion emission source radii measured by ALICE experiment can be well described the model with sub-nucleon structure. These studies shed new light on the understanding of the effective size of the \pipi emission source and on studying the intensity interferometry in small systems with a transport model.

  • Investigating the pion emission source in pp collisions using the AMPT model with sub-nucleon structure

    分类: 物理学 >> 核物理学 提交时间: 2024-12-26

    摘要: The measurement of momentum correlations of identical pions serves as a fundamental tool for probing the space-time properties of the particle emitting source created in high-energy collisions. Recent experimental results have shown that, in pp collisions, the size of the one-dimensional primordial source depends on the transverse mass (\mt) of hadron pairs, following a common scaling behavior, similar to that observed in Pb--Pb collisions. In this work, a systematic study of the \pipi source function and correlation function is performed using the multiphase transport model (AMPT) to understand the properties of the emitting source created in high multiplicity pp collisions at $\sqrt{s}=13$ TeV. The \mt scaling behavior and pion emission source radii measured by ALICE experiment can be well described the model with sub-nucleon structure. These studies shed new light on the understanding of the effective size of the \pipi emission source and on studying the intensity interferometry in small systems with a transport model.

  • HS-ES-DE: HS-ES Followed by L-SHADE-EpSin for Real Parameter Single Objective Optimization

    分类: 计算机科学 >> 计算机软件 提交时间: 2022-12-07

    摘要: For real parameter single objective optimization, Differential Evolution (DE) and Covariance Matrix Adaptation Evolution Strategy (CMA-ES) both perform powerfully. Nevertheless, in the field of real parameter single objective optimization, it is impossible for a given algorithm to perform well in all fitness landscapes. Practice has proved that ensemble of different algorithms may lead to improvement in solution. In this paper, based on two famous population-based metaheuristics - LSHADE-EpSin and HS-ES, we propose ensemble with successively executed constituent algorithms - HS-ES-DE. In our algorithm, HS-ES is replaced by L-SHADE-EpSin after stagnation is detected. Beside our HS-ES-DE, 12 population-based metaheuristics are involved in our experiments in which three benchmark test suites are employed. Experimental results show that our algorithm is very competitive.

  • The intersubjective interaction in psychoanalysis: Enlightenment from Martin Buber’s philosophy of dialogue

    分类: 心理学 >> 心理学其他学科 分类: 心理学 >> 临床与咨询心理学 提交时间: 2023-09-19

    摘要: 自20世纪70年代末伊始,精神分析领域的许多流派都发生了一种主体间转向。其中,布伯的对话哲学对理解精神分析的主体间互动具有重要启示,但这种探索有待深入。在结合众多现象学家的论述之后,可以将布伯区分的我-它关系和我-你关系视为两种最基本的人际关系模式。在精神分析中,我你关系主要表现为:(1)互动双方能充分投入到当下的对话之中,进行全身心地回应,在非言语交流和语言交流层面完成匹配;(2)当产生冲突之时,双方能够就意见不一致的地方进行协商,甚至在关系破裂之后努力修复。这种主体间互动模式在安全型依恋和一些良好的咨访关系中可以看到。我它关系更多意味着单向地操纵他人,以此满足自身的各种需求(如安全需要和自恋需要)。在极端的我它关系模式中,他人只是我的一种延伸,在我的需要和预期之外的各种情感、观念和行为,往往被漠视。这种主体间互动模式在自恋者、精神变态者、癔症来访者、躁狂者和强迫者等适应不良的个体那里很常见,也广泛存在于在日常生活中。我它关系的操纵过程可以通过语言、情绪和身体行动等途径来完成。此外,海德格尔描述的从上手状态转变为现成在手状态的三个阶段(触目、腻味和窘迫)可以用于理解人际操纵从成功到失败的变化,为来访者更替不良的互动模式提供转机。未来的精神分析研究可以在此基础上深入探索。

  • Communication within a Dyadic System

    分类: 心理学 >> 心理学其他学科 分类: 心理学 >> 临床与咨询心理学 提交时间: 2023-05-05

    摘要: The body, unconsciousness, and consciousness can be considered three stages of evolutionary mind from a phylogenetic perspective, which can be further framed as three hierarchies of mind based on dynamic systems theory. These three hierarchies interact via intrapersonal information flow, working in tandem to manage an individual well. Within a dyadic system, two minds with multiple hierarchies can interact through several basic communication forms (i.e., body-to-body, body-to-unconsciousness, body-to-consciousness, unconsciousness-to-unconsciousness, unconsciousness-to-consciousness, and consciousness-to-consciousness) based on interpersonal information flow. In actual exchanges, these forms are blended and become richer due to intrapersonal information flow. In psychoanalytic therapy, analysts should focus on intrapersonal information flow to enhance patients self-regulation while emphasizing therapistpatient interaction to execute mutual regulation. Overall, the therapistpatient and motherinfant interaction constitutes a complex communication process.

  • From defense to reconstruction: The hostility-meaning dual-path model of how observing others’ adversity influences self-negative disclosure

    分类: 心理学 >> 社会心理学 提交时间: 2025-06-08

    摘要: Objective: This study explored the mechanism by which observing peers’ adverse experiences influences distress disclosure of negative information through two progressive studies.Methods: Study 1 (N=218) constructed a moderated mediation model to analyze the relationships among stress, self-esteem, hostility traits, and disclosure. Study 2 (N=536) employed a situational experiment to test a chain mediation effect of "stress→meaning in life→distress disclosure," supplemented by multigroup analysis of path coefficient differences.Results: Study 1 showed stress directly inhibited disclosure (β=-0.37, pLimitations: The moderating effects of cultural values on the mechanism of adverse circumstance perception were not examined in this study.Conclusions: This research first uncovered the adaptive function of downward comparison and the mediating boundary of meaning reconstruction, expanding social comparison theory’s application scenarios. It provides a dual-path model for psychological interventions in failure education, based on stress transformation and meaning construction. Future studies are recommended to investigate cultural value moderations.

  • Synergistic effects of multiple driving factors on the runoff variations in the Yellow River Basin, China

    分类: 地球科学 >> 地理学 提交时间: 2021-09-08 合作期刊: 《干旱区科学》

    摘要: River runoff plays an important role in watershed ecosystems and human survival, and it is controlled by multiple environmental factors. However, the synergistic effects of various large-scale circulation factors and meteorological factors on the runoff on different time-frequency scales have rarely been explored. In light of this, the underlying mechanism of the synergistic effects of the different environmental factors on the runoff variations was investigated in the Yellow River Basin of China during the period 1950–2019 using the bivariate wavelet coherence (WTC) and multiple wavelet coherence (MWC) methods. First, the continuous wavelet transform (CWT) method was used to analyze the multiscale characteristics of the runoff. The results of the CWT indicate that the runoff exhibited significant continuous or discontinuous annual and semiannual oscillations during the study period. Scattered inter-annual time scales were also observed for the runoff in the Yellow River Basin. The meteorological factors better explained the runoff variations on seasonal and annual time scales. The average wavelet coherence (AWC) and the percent area of the significant coherence (PASC) between the runoff and individual meteorological factors were 0.454 and 19.89%, respectively. The circulation factors mainly regulated the runoff on the inter-annual and decadal time scales with more complicated phase relationships due to their indirect effects on the runoff. The AWC and PASC between the runoff and individual circulation factors were 0.359 and 7.31%, respectively. The MWC analysis revealed that the synergistic effects of multiple factors should be taken into consideration to explain the multiscale characteristic variations of the runoff. The AWC or MWC ranges were 0.320–0.560, 0.617–0.755, and 0.819–0.884 for the combinations of one, two, and three circulation and meteorological factors, respectively. The PASC ranges were 3.53%–33.77%, 12.93%–36.90%, and 20.67%–39.34% for the combinations one, two, and three driving factors, respectively. The combinations of precipitation, evapotranspiration (or the number of rainy days), and the Arctic Oscillation performed well in explaining the variability in the runoff on all time scales, and the average MWC and PASC were 0.847 and 28.79%, respectively. These findings are of great significance for improving our understanding of hydro-climate interactions and water resources prediction in the Yellow River Basin.

  • A study on historical location and evolution of Lop Nor in China with maps and DEM

    分类: 地球科学 >> 地理学 提交时间: 2021-07-23 合作期刊: 《干旱区科学》

    摘要: Lop Sea, located at the east end of the Tarim Basin, Northwest China, dried up permanently, which is the terminal lake of the Tarim River. Lop Sea was considered as the lake basin of Lop Nor since Quaternary. However, the possibility that Lop Nor was away from the Lop Sea in historical time is crucial to be discussed to interpret the proxy records in sediment profiles. To obtain a general view of the evolution of Lop Nor and Lop Sea in a historical period, several approaches were adopted in this paper. First, the Qianlong Thirteen-Row Atlas, an ancient imperial atlas of the Qing Dynasty, which was completed around 1760, indicated that the Tarim River formed a relatively large lake at its modern upstream region. Second, a Digital Elevation Model (DEM) with a 10-m spatial resolution and a relative precision of 0.42 m was derived from TanDEM-X/TerraSAR-X satellite image pairs using the interferometry method, which was verified using ICESat-GLAS laser footprints and a local DEM acquired by a drone. Finally, based on the spatial analysis of historical documents, expedition reports, sediment profiles and archaeological evidence, it can be deduced that the lacustrine deposition was discontinued in the Lop Sea. Six episodes in the evolutionary history of the drainage system in eastern Tarim Basin were summarized. The proved depositional condition variations could be used for future interpretation of proxy records in sediment. The high-accurate DEM provided a reference for the location of further fieldwork in the Lop Sea. The method proposed in this paper may be efficient for the research of inland lakes or rivers in global arid regions.

  • Quantification of groundwater recharge and evapotranspiration along a semi-arid wetland transect using diurnal water table fluctuations

    分类: 地球科学 >> 地理学 提交时间: 2021-06-04 合作期刊: 《干旱区科学》

    摘要: Groundwater is a vital water resource in arid and semi-arid areas. Diurnal groundwater table fluctuations are widely used to quantify rainfall recharge and groundwater evapotranspiration (ETg). To assess groundwater resources for sustainable use, we estimated groundwater recharge and ETg using the diurnal water table fluctuations at three sites along a section with different depths to water table (DWT) within a wetland of the Mukai Lake in the Ordos Plateau, Northwest China. The water table level was monitored at an hourly resolution using a Keller DCX-22A data logger that measured both the total pressure and barometric pressure, so that the effect of barometric pressure could be removed. At this study site, a rapid water table response to rainfall was observed in two shallow wells (i.e., Obs1 and Obs2), at which diurnal water table fluctuations were also observed over the study period during rainless days, indicating that the main factors influencing water table variation are rainfall and ETg. However, at the deep-water table site (Obs3), the groundwater level only reacted to the heaviest rainfalls and showed no diurnal variations. Groundwater recharge and ETg were quantified for the entire hydrological year (June 2017–June 2018) using the water table fluctuation method and the Loheide method, respectively, with depth-dependent specific yields. The results show that the total annual groundwater recharge was approximately 207 mm, accounting for 52% of rainfall at Obs1, while groundwater recharge was approximately 250 and 21 mm at Obs2 and Obs3, accounting for 63% and 5% of rainfall, respectively. In addition, the rates of groundwater recharge were mainly determined by rainfall intensity and DWT. The daily mean ETg at Obs1 and Obs2 over the study period was 4.3 and 2.5 mm, respectively, and the main determining factors were DWT and net radiation.

  • Propagation characteristics from meteorological drought to agricultural drought over the Heihe River Basin, Northwest China

    分类: 地球科学 >> 大气科学 提交时间: 2023-05-11 合作期刊: 《干旱区科学》

    摘要:In the context of global warming, drought events occur frequently. In order to better understanding the process and mechanism of drought occurrence and evolution, scholars have dedicated much attention on drought propagation, mainly focusing on drought propagation time and propagation probability. However, there are relatively few studies on the sensitivities of drought propagation to seasons and drought levels. Therefore, we took the Heihe River Basin (HRB) of Northwest China as the case study area to quantify the propagation time and propagation probability from meteorological drought to agricultural drought during the period of 1981–2020, and subsequently explore their sensitivities to seasons (irrigation and non-irrigation seasons) and drought levels. The correlation coefficient method and Copula-based interval conditional probability model were employed to determine the drought propagation time and propagation probability. The results determined the average drought propagation time as 8 months in the whole basin, which was reduced by 2 months (i.e., 6 months) on average during the irrigation season and prolonged by 2 months (i.e., 10 months) during the non-irrigation season. Propagation probability was sensitive to both seasons and drought levels, and the sensitivities had noticeable spatial differences in the whole basin. The propagation probability of agricultural drought at different levels generally increased with the meteorological drought levels for the upstream, midstream, and southern downstream regions of the HRB. Lesser agricultural droughts were more likely to be triggered during the irrigation season, while severer agricultural droughts were occurred mostly during the non-irrigation season. The research results are helpful to understand the characteristics of drought propagation and provide a scientific basis for the prevention and control of droughts. This study is of great significance for the rational planning of local water resources and maintaining good ecological environment in the HRB.

  • Investigating the elliptic anisotropy of identified particles in p–Pb collisions with a multi-phase transport model

    分类: 物理学 >> 核物理学 提交时间: 2024-01-18

    摘要: The elliptic azimuthal anisotropy coefficient ($v_{2}$) of the identified particles at midrapidity ($ eta <0.8$) was investigated in p--Pb collisions at $ sqrt{s_ mathrm{NN}}=$ 5.02 TeV using a multi-phase transport model (AMPT). The calculations of differential $v_{2}$ based on the advanced flow extraction method of light flavor hadrons (pions, kaons, protons, and $ Lambda$) in small collision systems were extended to a wider transverse momentum ($p_{ mathrm{T}}$) range of up to 8 GeV/$c$ for the first time. The string- melting version of the AMPT model provides a good description of the measured $p_{ mathrm{T}}$-differential $v_{2}$ of the mesons but exhibits a slight deviation from the baryon $v_{2}$. In addition, we observed the features of mass ordering at low $p_{ mathrm{T}}$ and the approximate number of constituent quarks (NCQ) scaled at intermediate $p_{ mathrm{T}}$. Moreover, we demonstrate that hadronic rescattering does not have a significant impact on $v_{2}$ in p--Pb collisions for different centrality selections, whereas partonic scattering dominates in generating the elliptic anisotropy of the final particles. This study provides further insight into the origin of collective-like behavior in small collision systems and has referential value for future measurements of azimuthal anisotropy.

  • The first Stalicoolithus shifengensis discovered in a clutch from the Sanshui Basin, Guangdong Province

    分类: 地球科学 >> 地质学 提交时间: 2018-01-23 合作期刊: 《古脊椎动物学报》

    摘要: The first clutch of Stalicoolithus shifengensis is described here. This incomplete dinosaur egg clutch in which three nearly complete eggs and two egg prints were preserved was discovered in the red deposits of the Sanshui Formation at a construction site near the sluice of North Village, Dali Town, Nanhai District, Foshan City, Guangdong Province, China. The eggs in the clutch are stacked with various ranges. Based on the characteristics of the eggshell, these eggs can be assigned to S. shifengensis. The discovery of S. shifengensis in the Sanshui Formation complements the clutch information about the oospecies as well as expands its paleogeographic distribution, and sets the foundation for discussing the diversity of dinosaur eggs in the Sanshui Basin.

  • New ootype prismatoolithids from the Late Cretaceous, Laiyang Basin and its significance

    分类: 生物学 >> 生物学其他学科 提交时间: 2018-07-18 合作期刊: 《古脊椎动物学报》

    摘要: Here we discribe a new ootypes of prismatoolithids found from the Late Cretaceous Jiangjunding Formation in the Laiyang Basin, Shandong Province. On the basis of characters such as elongate ovoids, smooth eggshell surface, relatively thinner eggshell thickness, prismatic eggshell units, slender pores in radial section of eggshell and little pores with round or irregular shapes in tangeital section of eggshell, we erect one new oogenus and one new oospecies: Laiyangoolithus lixiangensis oogen. et oosp. nov. The discovery of L. lixiangensis not only enriches the diversity and composition of the Laiyang Dinosaur Egg Fauna, but the paleogeographic distribution of primatoolithids as well. In addition, it provides more paleontological materials for the study of the diversity and paleogeographic distribution of troodontids in China.

  • Ecosystem service values of gardens in the Yellow River Basin, China

    分类: 环境科学技术及资源科学技术 >> 环境科学技术基础学科 提交时间: 2022-03-24 合作期刊: 《干旱区科学》

    摘要: Studies on the ecosystem service value (ESV) of gardens are critical for informing evidence- based land management practices based on an understanding of the local ecosystem. By analyzing equivalent value factors (EVFs), this paper evaluated the values of 11 ecosystem services of gardens in the Yellow River Basin of China in 2019. High-precision land use survey data were used to improve the accuracy of the land use classification, garden areas, and spatial distribution of the ESVs of gardens. The results showed that garden ecosystem generally had high ESVs, especially in terms of the ESV of food production, which is worthy of further research and application to the practice of land use planning and management. Specifically, the value of one standard EVF of ecosystem services in 2019 was 3587.04 CNY/(hm2a), and the ESV of food production of gardens was much higher than that of croplands. Garden ecosystem provided an ESV of 1348.66108 CNY/a in the Yellow River Basin. The areas with the most concentrated ESVs of gardens were located in four regions: downstream in the Shandong-Henan zone along the Yellow River, mid-stream in the Shanxi-Shaanxi zone along the Yellow River, the Weihe River Basin, and upstream in the Qinghai-Gansu-Ningxia-Inner Mongolia zone along the Yellow River. The spatial correlation of the ESVs in the basin was significant (global spatial autocorrelation index Moran's I=0.464), which implied that the characteristics of high ESVs adjacent to high ESVs and low ESVs adjacent to low ESVs are prominent. In the Yellow River Basin, the contribution of the ESVs of gardens to the local environment and economy varied across regions. We also put forward some suggestions for promoting the construction of ecological civilization in the Yellow River Basin. The findings of this study provide important contributions to the research of ecosystem service evaluation in the Yellow River Basin.