Doklady Physics最新文献_第3页

Composition-Driven Structural and Thermo-Physical Evolution in In–Sb–Se Chalcogenide Glasses: A Theoretical Study in - sb - se硫系玻璃成分驱动结构和热物理演化的理论研究

IF 0.3 4区物理与天体物理

Doklady Physics Pub Date : 2026-07-17 DOI: 10.1134/S1028335826600094

Diksha Sharma, Rita Sharma, Lakshay Dhiman

{"title":"Composition-Driven Structural and Thermo-Physical Evolution in In–Sb–Se Chalcogenide Glasses: A Theoretical Study","authors":"Diksha Sharma, Rita Sharma, Lakshay Dhiman","doi":"10.1134/S1028335826600094","DOIUrl":"10.1134/S1028335826600094","url":null,"abstract":"The present work investigates the influence of indium incorporation on the structural and thermo-physical characteristics of In–Sb–Se chalcogenide glass systems, InxSb30Se70 – x (x = 0–25), using a theoretical framework. A set of composition-dependent parameters including average coordination number, bond energy, network constraints, heat of atomization, deviation from stoichiometry, and lone-pair electron concentration were evaluated to understand the evolution of network connectivity and thermal stability. The results indicate that increasing indium content leads to enhanced network rigidity, as reflected by higher coordination numbers, increased bond strength, and reduced structural disorder. The decrease in lone-pair electrons and deviation from stoichiometry suggests improved cross-linking within the glassy network, contributing to enhanced thermal stability. In addition, a simple machine-learning-based regression model was employed as a supplementary validation tool to examine correlations between selected structural parameters and the glass transition temperature (Tg). The close agreement between theoretical predictions and regression-based estimates confirms the consistency and robustness of the adopted approach. The present study provides a systematic theoretical understanding of composition-driven trends in In–Sb–Se chalcogenide glasses and offers useful guidance for tailoring their thermo-physical properties.","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"71 6","pages":"188 - 193"},"PeriodicalIF":0.3,"publicationDate":"2026-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148466088","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

Tailored Synthesis and Detailed Characterization of Ni–Mg Co-doped CuO Nanostructures for Photocatalytic Degradation Efficiency Ni-Mg共掺杂CuO纳米结构的合成及光催化降解效率的详细表征

IF 0.3 4区物理与天体物理

Doklady Physics Pub Date : 2026-07-17 DOI: 10.1134/S1028335826600367

Sonia Attaf, Fouzia Abbas, Ouassila Benzaoui, Bouchra Slimani, Rosalba Fittipaldi, Chourouk Namoune, Rabeh Bensaha

{"title":"Tailored Synthesis and Detailed Characterization of Ni–Mg Co-doped CuO Nanostructures for Photocatalytic Degradation Efficiency","authors":"Sonia Attaf, Fouzia Abbas, Ouassila Benzaoui, Bouchra Slimani, Rosalba Fittipaldi, Chourouk Namoune, Rabeh Bensaha","doi":"10.1134/S1028335826600367","DOIUrl":"10.1134/S1028335826600367","url":null,"abstract":"In this study, we synthesized and investigated the influence of dopant nature on copper oxide nanoparticles (NPs) for four compositions: undoped CuO, Ni-doped CuO (Cu0.95Ni0.05O), Mg-doped CuO (Cu0.95Mg0.05O), and (Ni,Mg) co-doped CuO (Cu0.90Ni0.05Mg0.05O), using the sol–gel method. Samples were characterized through various characterization techniques and by photocatalytic performance. X-ray diffraction (XRD) analysis confirmed single-phase monoclinic CuO structure. (Ni,Mg) co-doping significantly reduced the average crystallite size from 20.95 to 6.24 nm. Scanning electron microscopy (SEM) demonstrated that the incorporation of Ni and Mg affected the morphology of the CuO NPS. Fourier-transform infrared (FTIR) spectra confirm the formation of CuO NPs. Moreover, (Ni,Mg) co-doping generated a synergistic electronic effect, where Ni narrowed and Mg widened the band gap, yielding an optimized band structure, improved light absorption in both the visible and UV ranges. This tunability is advantageous for photocatalytic applications, as the broader spectral response improves light harvesting and, consequently, photocatalytic efficiency.","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"71 6","pages":"178 - 187"},"PeriodicalIF":0.3,"publicationDate":"2026-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148466090","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

Nonlinear Second Harmonic Generation of q-Gaussian Laser Beam in Cold Quantum Plasma with Relativistic and Ponderomotive Forces 冷量子等离子体中q-高斯激光束的非线性二次谐波产生

IF 0.3 4区物理与天体物理

Doklady Physics Pub Date : 2026-07-17 DOI: 10.1134/S1028335826600057

Arnika Sharma, Anuj Vijay

引用次数: 0

A Novel Approach for Fabrication of Functional Carbon–Ceramic Composites with High Resistance to Gas Plasma Treatment 一种制备高抗气体等离子体处理功能碳-陶瓷复合材料的新方法

IF 0.5 4区物理与天体物理

Doklady Physics Pub Date : 2026-05-15 DOI: 10.1134/S1028335826600240

I. V. Sukmanov, O. A. Butusova, V. A. Pogodin, A. N. Astapov

{"title":"A Novel Approach for Fabrication of Functional Carbon–Ceramic Composites with High Resistance to Gas Plasma Treatment","authors":"I. V. Sukmanov, O. A. Butusova, V. A. Pogodin, A. N. Astapov","doi":"10.1134/S1028335826600240","DOIUrl":"10.1134/S1028335826600240","url":null,"abstract":"This work is aimed to develop a technology for fabrication of high-temperature carbon–ceramic composite materials. The approach includes the following processing stages: the fabrication of filled carbon-fiber blanks, their subsequent carbonization, high-temperature heat treatment, and pyrolytic compaction. A distinctive feature of the technology is the impregnation of particles of refractory component precursors into the interlayer space, that ensures in situ synthesis and subsequent sintering of the ceramic component of the matrix during the carbonization and high-temperature heat treatment stages. This approach has been successfully tested in the fabrication of carbon–ceramic composites in the Cf/C system—carbides and borides of transition metals of IV (Hf, Ti) and V (Nb) groups. The results of gas-dynamic tests of samples of the resulting composites under the influence of high-speed, high-enthalpy flows of oxidizing gases are presented. It is noted that the number of functional layers and their thickness allow to regulate the magnitude of the thermal load by changing the rate of oxidation, ablation and the duration of each mode.","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"71 3","pages":"86 - 92"},"PeriodicalIF":0.5,"publicationDate":"2026-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147938768","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

The Effect of Dynamic Viscosity of Hydrocarbons Saturated with Supercritical CO2 on the Filtration Process of the Hydrocarbon–Supercritical-Fluid System in a Porous Medium 饱和超临界CO2的烃类动态粘度对多孔介质中烃类-超临界-流体体系过滤过程的影响

IF 0.5 4区物理与天体物理

Doklady Physics Pub Date : 2026-05-15 DOI: 10.1134/S1028335826700011

A. V. Radaev, A. N. Sabirzyanov, N. A. Vaseneva

引用次数: 0

An Experimental Investigation of the Normal Total Emissivity of EP718 Alloy as a Function of the Surface Condition EP718合金法向总发射率随表面条件变化的实验研究

IF 0.5 4区物理与天体物理

Doklady Physics Pub Date : 2026-05-15 DOI: 10.1134/S1028335826700023

D. V. Kosenkov, V. V. Sagadeev

引用次数: 0

RF Behavior and Non-Quasi-Static Modeling of Junctionless Tunnel Field Effect Transistor under Process Driven Variations 工艺驱动下无结隧道场效应晶体管的射频行为和非准静态建模

IF 0.5 4区物理与天体物理

Doklady Physics Pub Date : 2026-05-15 DOI: 10.1134/S1028335825600907

Yusra Siddiqui, Vedvrat, Imran Ullah Khan

{"title":"RF Behavior and Non-Quasi-Static Modeling of Junctionless Tunnel Field Effect Transistor under Process Driven Variations","authors":"Yusra Siddiqui,  Vedvrat, Imran Ullah Khan","doi":"10.1134/S1028335825600907","DOIUrl":"10.1134/S1028335825600907","url":null,"abstract":"Junctionless field effect transistors heavily rely on control gate engineering to perform. Dielectric material types, scaling of gate oxide, gate metal work, among others all choose the performance of the entire device. This paper simulates and analyses a graphene nanoribbon double gate junctionless tunnel field effect transistor (DG-JL GNR-TFET) using a non-quasi-static small-signal model to investigate its radio frequency properties. The control gate engineering effect, dielectric choice, and oxide scaling has been evaluated in detail with regard to device performance. The experiment shows that as the thickness of the oxide is increased, the efficiency of tunneling increases and the cut-off frequency (fT) reaches a maximum of 1.01 × 1012 Hz when the oxide thickness is 1nm thick. Electrostatic control is further enhanced by high-k dielectrics with TiO2 (2 nm) giving the best trade-off, with current ratio of 2.61 × 1012, subthreshold swing of 20.75 mV/dec, transconductance of 0.36 mS and gate capacitance of 0.065 fF at 1 V gate and drain voltages. Work function variation reveals an inverse dependence of frequency on work function, with the highest value (5.23 × 1011 Hz) obtained at 4.1 eV. Comparative benchmarking against reported tunnel field effect transistors highlights the superior switching ratio and steep subthreshold swing of the proposed device, confirming its potential for low-power, high-efficiency radio frequency front-end circuits and emerging Internet of Everything applications.","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"71 3","pages":"67 - 81"},"PeriodicalIF":0.5,"publicationDate":"2026-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147938738","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

Analytical Investigation of q-Gaussian Beam Propagation in Cold Quantum Plasma with Absorption Effects 具有吸收效应的冷量子等离子体中q-高斯光束传输的分析研究

IF 0.5 4区物理与天体物理

Doklady Physics Pub Date : 2026-05-14 DOI: 10.1134/S1028335826600045

Keshav Walia

引用次数: 0

Terahertz Generation in Collisional Plasma: A Comparative Study of Slanted Density Profiles Using Radially Polarized q-Gaussian Laser Beams 碰撞等离子体中的太赫兹产生：使用径向偏振q-高斯激光束的倾斜密度分布的比较研究

IF 0.5 4区物理与天体物理

Doklady Physics Pub Date : 2026-05-14 DOI: 10.1134/S1028335826600082

Himani Kokila, Vivek Sharma, Vishal Thakur

{"title":"Terahertz Generation in Collisional Plasma: A Comparative Study of Slanted Density Profiles Using Radially Polarized q-Gaussian Laser Beams","authors":"Himani Kokila, Vivek Sharma, Vishal Thakur","doi":"10.1134/S1028335826600082","DOIUrl":"10.1134/S1028335826600082","url":null,"abstract":"Laser-plasma interaction-based terahertz (THz) radiation sources are being actively studied due to their tunability and large output potential. In this research, we analyze the theoretical study of THz wave generation driven by two radially polarized q-Gaussian laser beams propagating through a slanting density collisional plasma. A model is formulated to study the effect of plasma density gradient on the nonlinear ponderomotive force. This force is responsible for creating nonlinear current density that emits THz. Factors such as variation in plasma density, density gradient (({{n}_{r}})), background plasma density (({{n}_{0}})), beam radial position ((r)), electron neutral collision frequency (({{nu }_{{{text{en}}}}})) and the q-parameter have been included in the model. A comparison analysis, along with 3D graphical results, indicates that the output of THz enhances in case of positive density gradient but the q-parameter govern the field amplitude. According to these findings, the adjustment of plasma density profile and beam structure allows higher quality and tunable THz generation. The findings provide valuable guidance to developing plasma-based THz sources with efficient and structured plasma waveguides.","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"71 2","pages":"57 - 65"},"PeriodicalIF":0.5,"publicationDate":"2026-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147924051","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

Investigation of the Thermomechanical Properties of a Polylactic Acid/ZnO Biocomposite Film Distained for Food Packaging 食品包装用聚乳酸/ZnO生物复合膜的热机械性能研究

IF 0.5 4区物理与天体物理

Doklady Physics Pub Date : 2026-04-20 DOI: 10.1134/S1028335825600750

S. Hadjab, F. Boufelgha, R. Zellagui, N. Brihi, A. Rouabah

{"title":"Investigation of the Thermomechanical Properties of a Polylactic Acid/ZnO Biocomposite Film Distained for Food Packaging","authors":"S. Hadjab, F. Boufelgha, R. Zellagui, N. Brihi, A. Rouabah","doi":"10.1134/S1028335825600750","DOIUrl":"10.1134/S1028335825600750","url":null,"abstract":"Studies have been conducted on how the structural, thermal, morphological, mechanical, and antibacterial properties of PLA polymer are affected by low filling concentrations of ZnO nanoparticles. This study proposes the fabrication of biodegradable PLA–ZnO films with ZnO filling percentages ranging from 2.5 to 40%, utilising a cost-effective process involving solvent casting combined with ultrasonication at room temperature. The films were characterised using XRD, FTIR, SEM, TGA testing, tensile testing, and antibacterial testing against E. coli and S. aureus. The integration of ZnO affects the structural semi-crystallisation of the PLA matrix and prefers an hkl crystallographic orientation as support. SEM images confirmed the efficient dispersion of nanoparticles in all films, which has a direct impact on thermal stability. Regarding mechanical properties, tests conducted according to the ATMD-882 standard demonstrated good properties even at the saturation point of 40%. Ultimately, this study demonstrates that biodegradable films exhibit effective antibacterial activity against E. coli and S. aureus, even at low filling ratios, thereby suggesting their potential applicability in the food packaging sector.","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"71 1","pages":"10 - 22"},"PeriodicalIF":0.5,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147865761","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