物理最新文献

{"title":"Editorial.","authors":"David Andelman, Jean-Marc Di Meglio, Cyrus R Safinya","doi":"10.1140/epje/s10189-024-00439-2","DOIUrl":"https://doi.org/10.1140/epje/s10189-024-00439-2","url":null,"abstract":"","PeriodicalId":790,"journal":{"name":"The European Physical Journal E","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141449293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Calorimetric, optical and dielectric measurements on two Schiff's based liquid crystalline materials exhibiting multiple phase transitions.","authors":"Prabir Sarkar, Barnali Barman, Parameswara Rao Alapati, Malay Kumar Das","doi":"10.1140/epje/s10189-024-00436-5","DOIUrl":"https://doi.org/10.1140/epje/s10189-024-00436-5","url":null,"abstract":"<p><p>We report high-resolution calorimetric, optical and dielectric studies on two Schiff's based liquid crystalline materials, 4O.5 and 5O.5, which exhibit multiple phase transitions. The study goes beyond the commonly studied isotropic-to-nematic (I-N) and nematic-to-smectic A (N-SmA) phase transitions and explores higher-order smectic phase transitions. The critical exponent, α values, for different phase transitions has been explored. For the I-N, N-SmA, SmA-SmC, SmC-SmF, SmF-CrG and SmB-CrG transitions, α values close to 0.5 and amplitude ratios A^-/A⁺ ~ 1.6 and D^-/D⁺ ~ 1 indicate a first-order nature. Notably, for the SmA-SmB transition, although α (≈ 0.64) is larger than the tricritical value of 0.5, A^-/A⁺ ~ 1.2 and D^-/D⁺ ~ 1, and the study reports an order parameter critical exponent (β) of 0.26 ± 0.002, which supports a tricritical nature for this transition. Importantly, the ratios of A^-/A⁺ and D^-/D⁺ are found to have similar values across all three-measurement methods, indicating consistency and agreement among these methods.</p>","PeriodicalId":790,"journal":{"name":"The European Physical Journal E","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141441945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of the number of topological defects in active nematic fluids under applied shear flow.","authors":"Zhenna Li, Hao Ye, Jianzhong Lin, Zhenyu Ouyang","doi":"10.1140/epje/s10189-024-00437-4","DOIUrl":"https://doi.org/10.1140/epje/s10189-024-00437-4","url":null,"abstract":"<p><p>The number of topological defects in the shear flow of active nematic fluids is numerically investigated in this study. The evolution of the flow state of extensile active nematic fluids is explored by increasing the activity of active nematic fluids. Evidently, medium-activity active nematic fluids exhibit a highly ordered vortex lattice fluid state. However, high-activity active nematic fluids exhibit a meso-scale turbulent flow accompanied by topological defects. The number of topological defects (N_def) increases with increasing shear Reynolds number (Re_s). Fluid viscosity strongly influences N_def, while the influence of fluid density is relatively weak. N_def decreases with increasing activity length scale (l_ζ) value. A small Re_s value strongly influences N_def, whereas a large l_ζ value only weakly influences N_def. As the activity increases, N_def in contractile active nematic fluids becomes larger than that of extensile active nematic fluids.</p>","PeriodicalId":790,"journal":{"name":"The European Physical Journal E","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141425944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structure-property modeling of physicochemical properties of fractal trigonal triphenylenoids by means of novel degree-based topological indices.","authors":"K Jyothish, Roy Santiago, S Govardhan, Sakander Hayat","doi":"10.1140/epje/s10189-024-00438-3","DOIUrl":"https://doi.org/10.1140/epje/s10189-024-00438-3","url":null,"abstract":"<p><p>Trigonal triphenylenoids (TTPs) are a fascinating class of organic molecules with unique structural and electronic properties. Their diverse applications, ranging from organic electronics to nonlinear optics, have spurred significant research interest in understanding their physicochemical behavior. Topological indices, mathematical descriptors derived from the molecular graph, offer valuable insights into the structural complexity and potential properties of TTPs. This work focuses on exploring the utility of degree-based topological indices in characterizing and predicting the properties of trigonal triphenylenoids. We systematically calculate various degree-based topological indices, for a diverse set of TTPs with varying substituents and topologies. The relationships between these indices and key physicochemical properties, such as HOMO-LUMO energy gap, thermodynamic stability, and reactivity are investigated using statistical and machine learning approaches. We identify significant correlations between specific degree-based indices and different properties, allowing for potential prediction of these properties based solely on the topological information.</p>","PeriodicalId":790,"journal":{"name":"The European Physical Journal E","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141417119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bifurcation analysis and control of improved traffic flow model considering the effect of strong winds.","authors":"Wenhuan Ai, Zhengqing Lei, Danyang Li, Jingming Zeng, Dawei Liu","doi":"10.1140/epje/s10189-024-00433-8","DOIUrl":"https://doi.org/10.1140/epje/s10189-024-00433-8","url":null,"abstract":"<p><p>In recent years, the problem of traffic congestion has become increasingly serious, and research on traffic system control has become a new hotspot. Studying the bifurcation characteristics of traffic flow systems and designing control schemes for unstable support points can alleviate traffic congestion from a new perspective. This article improves the full speed differential model considering strong wind models from the perspective of bifurcation control to adjust traffic flow. This article theoretically proves the existence conditions of Hopf bifurcation and saddle node bifurcation in the model and finds the stability mutation point of the transportation system stability. A nonlinear system feedback controller was designed for unstable bifurcation points using Chebyshev polynomial approximation and random feedback control methods. Without changing the system equilibrium point, the advance, delay, and elimination of Hopf bifurcation were achieved, and the abrupt behavior of the transportation system was controlled, thereby alleviating traffic congestion. This article explains the changes in the stability of complex transportation systems from the perspective of bifurcation analysis, which can better capture the characteristics of traffic flow. By adjusting the control parameters in the feedback controller, the influence of boundary conditions on the stability of the transportation system is fully described, and the influence of unstable focal points and saddle points on the system is suppressed, thereby slowing down the traffic flow. In addition, unstable bifurcation points can be eliminated, and the Hopf bifurcation can be controlled to advance, delay, and disappear, thereby achieving control over the stable behavior of the transportation system. This helps alleviate traffic congestion and also helps describe actual traffic phenomena.</p>","PeriodicalId":790,"journal":{"name":"The European Physical Journal E","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141330082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Setup for interaction-free measurement of multiple objects using single quantum probe","authors":"S. Filatov, Marcis Auzinsh","doi":"10.1007/s00340-024-08257-2","DOIUrl":"https://doi.org/10.1007/s00340-024-08257-2","url":null,"abstract":"","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141335531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessing the influence of public behavior and governmental action on disease dynamics: a PRCC analysis and optimal control approach","authors":"Protyusha Dutta, Sangeeta Saha, G. Samanta","doi":"10.1140/epjp/s13360-024-05327-4","DOIUrl":"https://doi.org/10.1140/epjp/s13360-024-05327-4","url":null,"abstract":"","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141336085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Strain manipulates the electric, elastic, thermal, and optical properties of MXene Lu2CT2 (T = F, OH)","authors":"Shaobo Chen, San-Dong Guo, Bing Lv","doi":"10.1140/epjp/s13360-024-05326-5","DOIUrl":"https://doi.org/10.1140/epjp/s13360-024-05326-5","url":null,"abstract":"","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141335970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ag2S nanoflakes decorated over rGO nanosheets: a sustainable and highly efficient electrocatalyst for oxygen evolution reaction","authors":"Monizah Nazim, A. Alrowaily, B. M. Alotaibi, Haifa A. Alyousef, Abdullah G. Al-Sehemi, A. M. A. Henaish","doi":"10.1140/epjp/s13360-024-05285-x","DOIUrl":"https://doi.org/10.1140/epjp/s13360-024-05285-x","url":null,"abstract":"","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141336684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Time-division multiplexing underwater light communication using two identical green quantum well diodes","authors":"Pengzhan Liu, Linning Wang, Ziqian Qi, Yingze Liang, Yuan Jiang, Yongjin Wang","doi":"10.1007/s00340-024-08259-0","DOIUrl":"https://doi.org/10.1007/s00340-024-08259-0","url":null,"abstract":"","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141336847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}