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Correlations for Limestone Properties Used in Cultural Heritage Monuments in Malta 马耳他文化遗产古迹所用石灰岩特性的相关性
IF 1.5 4区 物理与天体物理
Romanian Journal of Physics Pub Date : 2023-12-15 DOI: 10.59277/romjphys.2023.68.911
Lino Bianco
{"title":"Correlations for Limestone Properties Used in Cultural Heritage Monuments in Malta","authors":"Lino Bianco","doi":"10.59277/romjphys.2023.68.911","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.911","url":null,"abstract":"\"The aim of this paper is to identify mathematical correlations between the physical and geochemical properties of first quality limestone extracted from the Lower Globigerina Member. Based on published results, it can be confirmed that very strong correlations exist for (i) apparent density and uniaxial compressive strength when limestone is in a saturated condition, and (ii) ultrasonic pulse velocity – both perpendicular and parallel to the bedding plane – and uniaxial compressive strength when limestone is in either oven-dried or saturated conditions. Stronger correlation is present with respect to apparent density when limestone is oven-dried and color. The correlations for color and (a) ferric oxide, and (b) loss-on-ignition are also strong.\"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"225 16","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138997280","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}
引用次数: 0
Hyperbranched PEI-PEG/DNA Polyplex Formation: A Molecular Dynamics Study 超支化 PEI-PEG/DNA 多聚体的形成：分子动力学研究
IF 1.5 4区 物理与天体物理
Romanian Journal of Physics Pub Date : 2023-12-15 DOI: 10.59277/romjphys.2023.68.618
Paul Trofin, T. Beu
{"title":"Hyperbranched PEI-PEG/DNA Polyplex Formation: A Molecular Dynamics Study","authors":"Paul Trofin, T. Beu","doi":"10.59277/romjphys.2023.68.618","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.618","url":null,"abstract":"\"PEGylated PEIs are intensely studied non-viral vectors for gene delivery, having high transfection efficiencies. Using all-atom molecular dynamics simulations, the interaction of hyperbranched polyethylenimine polyethylene glycol (HPEI-PEG) with DNA was investigated for different number of PEG chains per HPEI core, and, to this end, a new CHARMM Force Field for PEG was developed. The obtained force field parameters are validated by the good agreement of structural measures, such as the radius of gyration, with experimental evidence. The reported investigations reveal an upper bound for the PEG fraction in the modelled HPEI-PEG polymers. The addition of PEG reduces cytotoxicity, increases solubility, while still ensuring a high efficiency of forming polyplexes with DNA. Useful correlations between the copolymer structure and polyplex properties are observed, along with insights on the dynamics of the formation of hydrogen bonds between the HPEI core and DNA.\"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"169 s1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138998401","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}
引用次数: 0
RF Electron Source Design Modelling for Optimization of Initial e- Beam Parameters for LCS γ-Ray System 用于优化 LCS γ 射线系统初始电子束参数的射频电子源设计模型
IF 1.5 4区 物理与天体物理
Romanian Journal of Physics Pub Date : 2023-12-15 DOI: 10.59277/romjphys.2023.68.304
E. Iuciuc, P. Tracz, H. Schubert
{"title":"RF Electron Source Design Modelling for Optimization of Initial e- Beam Parameters for LCS γ-Ray System","authors":"E. Iuciuc, P. Tracz, H. Schubert","doi":"10.59277/romjphys.2023.68.304","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.304","url":null,"abstract":"\"The paper presents results from computer simulations performed on a model of an RF electron source for the Laser Compton Scattering (LCS) γ-ray system. The new LCS γ-ray system is under implementation at ELI-NP/IFIN-HH. Different configurations of the system modelled with the ASTRA software package and different setings on the system components were analysed to optimize the inital beam parameters before acceleration up to ultra-relativistic energy in linac. The properly designed RF electron source contibutes significantly towards delivery a high brightness beam, which is a crucial specification for the LCS γ-rays systems.\"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"55 4","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138999348","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}
引用次数: 0
Steps Toward Optimizing HPGE Detector Efficiency in the Context of Low-Level Radioactivity Detection 在低水平放射性检测中优化 HPGE 检测器效率的步骤
IF 1.5 4区 物理与天体物理
Romanian Journal of Physics Pub Date : 2023-12-15 DOI: 10.59277/romjphys.2023.68.305
Dalal Abdel Aziz, H. Saudi, H. Zakaly, Waffa EL-MELEGY, H. M. Diab
{"title":"Steps Toward Optimizing HPGE Detector Efficiency in the Context of Low-Level Radioactivity Detection","authors":"Dalal Abdel Aziz, H. Saudi, H. Zakaly, Waffa EL-MELEGY, H. M. Diab","doi":"10.59277/romjphys.2023.68.305","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.305","url":null,"abstract":"\"Different empirical and theoretical methods are used to precisely determine radionuclide activity concentrations. This study used Monte Carlo simulation MCNP5 code and EFFTRAN software (Efficiency Transfer) to determine the HPGe detector Full-Energy Peak (FEP) efficiency. A set of point sources (133Ba, 152Eu, 137Cs, 60Co, and 22Na) fixed on the top of the standard geometry plastic container were measured in order to obtain the calibration curve. Because of the importance of chemical composition parameters, the detector behavior due to different matrices was investigated. Experimental verification of the calibration was obtained using IAEA-TEL-2021-03 quality control water sample spiked with 152Eu and 133Ba, and the results were compared with reported results. A set of Certified Standard Reference samples were used for method validation. The obtained results were compared with the experimental results. The comparison clarified the advantages and disadvantages of both methods and their precision to demonstrate and suitable method for matrix types.\"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"11 4","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138996638","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}
引用次数: 0
Numerical Simulation of Thermally Radiative and EMHD Influenced Viscoplastic Fluid Flow: A Second Law Investigation 热辐射和电磁流影响粘塑流体流动的数值模拟：第二定律研究
IF 1.5 4区 物理与天体物理
Romanian Journal of Physics Pub Date : 2023-12-15 DOI: 10.59277/romjphys.2023.68.117
K. Deepa
{"title":"Numerical Simulation of Thermally Radiative and EMHD Influenced Viscoplastic Fluid Flow: A Second Law Investigation","authors":"K. Deepa","doi":"10.59277/romjphys.2023.68.117","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.117","url":null,"abstract":"\"This work rigorously presents the findings of entropy generation in Casson fluid flow on a Riga plate, exposed in a radiative environment. The conceptual basis for the investigation of fluid flow is the system of governing boundary layer equations. By means of implicit finite difference procedure the solutions of boundary layer equations are acquired. Primary goal of this study manifests the optimization of entropy generation in Casson fluid flow associated with EMHD (Electro Magneto Hydro Dynamics) Lorentz force and thermal radiation. Additionally, the contours of entropy generation and Bejan number are demonstrated. Validation of present results with previously obtained results from literature is accomplished conscientiously.\"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"333 8","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138996654","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}
引用次数: 0
Modeling Alpha Particle-Induced Radioluminescence Using Geant4 利用 Geant4 模拟阿尔法粒子诱发的放射线发光
IF 1.5 4区 物理与天体物理
Romanian Journal of Physics Pub Date : 2023-10-23 DOI: 10.59277/romjphys.2023.68.307
Claudia Olaru, Mihail-Răzvan Ioan, Mastaneh Zadehrafi
{"title":"Modeling Alpha Particle-Induced Radioluminescence Using Geant4","authors":"Claudia Olaru, Mihail-Răzvan Ioan, Mastaneh Zadehrafi","doi":"10.59277/romjphys.2023.68.307","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.307","url":null,"abstract":"\"Optical detection of alpha particle emitters in the environment by air radioluminescence is a new technology that enables sensing a radiological threat at safe distances, without putting personnel at risk or contaminating equipment. Radiolumi- nescence detection systems need to be fine-tuned to efficiently capture a substantial number of photons while minimizing the contribution from ambient ultraviolet light. The accurate simulation of radioluminescence, in conjunction with ray tracing, facili- tates the design and optimization of such detection systems. In this work, an application within the Geant4 framework has been developed to simulate radioluminescence pho- tons emitted in the vicinity of accelerated alpha particles and at the surface of alpha ra- dioactive samples. The application relies on existing scintillation physics implemented in Geant4 classes such as G4OpticalPhysics and G4Scintillation, which are used to simulate radioluminescence photons as scintillations produced during the passage of alpha particles through air. The application computes the ultraviolet image of alpha particles accelerated at energies of 5.1 MeV and 8.3 MeV, as well as an extended alpha source, M. Luchkov et al., Nucl. Instrum. Meth. Phys. Res. A 1047, 167895 (2023) [1]. The application enables optimization of experimental setups for various scenarios, such as radiological emergency management, radiological crime scene investigations, or decommissioning of nuclear facilities, thus minimizing the use of costly resources and exposure to radiation.\"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"197 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139315063","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}
引用次数: 0
Romanian Earthquakes Database. Part I: 984 - 1899 罗马尼亚地震数据库。第一部分:984 - 1899
4区 物理与天体物理
Romanian Journal of Physics Pub Date : 2023-09-15 DOI: 10.59277/romjphys.2023.68.805
R. DINESCU, M. POPA, D. GHICA, A. CHIRCEA, M. RADULIAN, B. GRECU, C. NEAGOE, O. JIANU
{"title":"Romanian Earthquakes Database. Part I: 984 - 1899","authors":"R. DINESCU, M. POPA, D. GHICA, A. CHIRCEA, M. RADULIAN, B. GRECU, C. NEAGOE, O. JIANU","doi":"10.59277/romjphys.2023.68.805","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.805","url":null,"abstract":"\"The main purpose of this study is to create a database that correlates the data from the current catalogue of Romanian earthquakes (ROMPLUS) with the information from other available catalogues, research studies for the events produced between 984 and 1899, historical documents, and mentions in archives or historical papers. The database will contain, in addition to the ROMPLUS available information, the type of event (tectonic or anthropic) and the references attached to each event. In the second step of our analysis (events recorded after 1900), the database will be updated and connected with the catalogue of the earthquake mechanisms. \"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"290 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135487858","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}
引用次数: 0
Gravity and Matter Reinterpreted 重新诠释重力和物质
4区 物理与天体物理
Romanian Journal of Physics Pub Date : 2023-09-15 DOI: 10.59277/romjphys.2023.68.110
RENATA JORA
{"title":"Gravity and Matter Reinterpreted","authors":"RENATA JORA","doi":"10.59277/romjphys.2023.68.110","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.110","url":null,"abstract":"\"In this work we propose a universal action for gravity and matter which in first orders leads to standard gravity and QFT theories. In our theory matter acts as conformal factors of generic conformal transformations applied to the metric. In this framework we derived easily the Schwarzschild metric with cosmological constant and the Reissner-Nordstrom metric. Moreover we estimate the value of the cosmological constant in very good agreement with the natural value.\"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135488285","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}
引用次数: 0
Post-Earthquake Assessment for Seismic Risk Mitigation in Romania: Case-Studies Based on Recorded Data 罗马尼亚减轻地震风险的震后评估:基于记录数据的案例研究
4区 物理与天体物理
Romanian Journal of Physics Pub Date : 2023-09-15 DOI: 10.59277/romjphys.2023.68.804
B. F. APOSTOL, S. F. BALAN, A. DANET
{"title":"Post-Earthquake Assessment for Seismic Risk Mitigation in Romania: Case-Studies Based on Recorded Data","authors":"B. F. APOSTOL, S. F. BALAN, A. DANET","doi":"10.59277/romjphys.2023.68.804","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.804","url":null,"abstract":"\"The seismic recordings from certain types of buildings in urban areas during moderate earthquakes from Vrancea-intermediate depth focal region are processed and analysed. One of the most important element in hazard evaluation at national level is the seismic recording network which has been upgraded in the last years up to over 20 strong motion accelerometers in Bucharest and 135 in Romania with easy data handling (accelerations easy to transform in displacements). The general behaviour of reinforced concrete buildings in Bucharest Metropolis during destructive seismic events from Vrancea-intermediate depth focal region is briefly described. The analysis of the elastic response spectra is made for four buildings subjected to the two recent earthquakes with magnitude higher than 4.8, of October 28, 2018 and January 31, 2020 from Vranceaintermediate depth seismic zone. The information consisting in maximum level of the pseudo-acceleration to which the buildings were subjected may be used to detect and quantify any exceedance of the code spectra of interest in near real-time. The recorded earthquakes data are transmitted in real time to the National Data Centre. The goal is to develop and implement modern techniques and tools able to estimate the effect of earthquakes on the built environment in the shortest time possible after a major earthquake. \"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"210 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135488287","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}
引用次数: 0
Controlling the Size of C70 Fullerene Whiskers by Evaporation of Solution Droplets 用液滴蒸发法控制C70富勒烯晶须的尺寸
4区 物理与天体物理
Romanian Journal of Physics Pub Date : 2023-09-15 DOI: 10.59277/romjphys.2023.68.616
U.K. MAKHMANOV, S.A. ESANOV, B.A. ASLONOV, Z. BEKMURODOV, K.N. MUSURMONOV, A. SHUKUROV, A.M. KOKHKHAROV
{"title":"Controlling the Size of C70 Fullerene Whiskers by Evaporation of Solution Droplets","authors":"U.K. MAKHMANOV, S.A. ESANOV, B.A. ASLONOV, Z. BEKMURODOV, K.N. MUSURMONOV, A. SHUKUROV, A.M. KOKHKHAROV","doi":"10.59277/romjphys.2023.68.616","DOIUrl":"https://doi.org/10.59277/romjphys.2023.68.616","url":null,"abstract":"\"The formation of one-dimensional nanostructures (nanowhiskers) during the evaporation of a drop of C70 fullerene solution in ortho-xylene on a smooth surface of a glass substrate was studied. The growth mechanisms of fullerene nanostructures were analyzed, as well as their morphological and size characteristics were determined. \"","PeriodicalId":54449,"journal":{"name":"Romanian Journal of Physics","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135488289","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}
引用次数: 0
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