Doklady Physics最新文献_第4页

Cavitation Technologies for Deep Processing of Lignocellulosic Biomass 木质纤维素生物质深加工的空化技术

IF 0.5 4区物理与天体物理

Doklady Physics Pub Date : 2026-04-20 DOI: 10.1134/S1028335825600889

I. A. Kozlov, V. A. Mamonov

{"title":"Cavitation Technologies for Deep Processing of Lignocellulosic Biomass","authors":"I. A. Kozlov, V. A. Mamonov","doi":"10.1134/S1028335825600889","DOIUrl":"10.1134/S1028335825600889","url":null,"abstract":"This paper substantiates the relevance of developing new technological solutions for the complex processing of lignocellulosic raw materials in the interests of Russia’s scientific and technological leadership. A comprehensive method has been developed that allows the production of high-quality wood pulp suitable for further deep chemical processing to produce products, including dual-use ones. A comprehensive method for alkaline hydrolysis of wood assortments is proposed, including alkaline catalytic delignification and a pre-hydrolysis stage using physical methods, that is, ultrasonic treatment. In this work, the lignocellulose raw material is subjected to an additional physical influence, which leads to its destruction and an increase in the specific surface area, and, consequently, to an increase in reactivity. By selecting the process modes and design parameters of the reactor, it is possible to ensure predetermined values of the quality of the resulting cellulose. This approach allows one to obtain high-quality cellulose with a yield of 40–45% and a degree of delignification of up to 2–5 Kappa units, with content α-cellulose up to 94–98 units, breaking length up to 12 500 m, and a tear resistance of up to 1500 mN.","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"71 2","pages":"41 - 44"},"PeriodicalIF":0.5,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147924048","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

Truth in Nonlinearity: Measurement of n2 and Multiphoton Absorption Coefficients in Fused Silica from 420 to 1600 nm 非线性的真理：420至1600 nm熔融二氧化硅中n2和多光子吸收系数的测量

IF 0.5 4区物理与天体物理

Doklady Physics Pub Date : 2026-04-20 DOI: 10.1134/S1028335825600890

P. A. Danilov, C. Zhu, Yu. S. Gulina, D. A. Pomazkin, G. K. Krasin, M. S. Kovalev

{"title":"Truth in Nonlinearity: Measurement of n2 and Multiphoton Absorption Coefficients in Fused Silica from 420 to 1600 nm","authors":"P. A. Danilov, C. Zhu, Yu. S. Gulina, D. A. Pomazkin, G. K. Krasin, M. S. Kovalev","doi":"10.1134/S1028335825600890","DOIUrl":"10.1134/S1028335825600890","url":null,"abstract":"This paper presents quantitative measurements of the nonlinear refractive index n2 and multiphoton absorption coefficients (from three- to six-photon) of fused silica (SiO2) in the wavelength range of 420–1600 nm, performed by Z-scan technique with femtosecond pulses (~150 fs). It was found that the nonlinear susceptibility is caused predominantly by the instantaneous electronic response, as confirmed by the agreement of the experimental data with the Kramers–Kronig relations. The observed nonmonotonic spectral dispersion, including an anomalous enhancement of four-photon absorption at 490 nm and a maximum n2 in the near IR at 1300 nm, is interpreted as a consequence of resonant enhancement of virtual transitions near UV‑edges of the fundamental absorption band and the possible contribution of phonon modes in the infrared region. The obtained data provide a consistent and reliable set of parameters for modeling the nonlinear interaction of ultrashort laser pulses with SiO2 in bulk photonics and laser micromachining applications.","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"71 2","pages":"45 - 49"},"PeriodicalIF":0.5,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147924049","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

Angular Displacement as a Temporal Coordinate: A Geometric Framework for Rotational Dynamics 角位移作为时间坐标：旋转动力学的几何框架

IF 0.5 4区物理与天体物理

Doklady Physics Pub Date : 2026-04-20 DOI: 10.1134/S1028335825600701

Pu Guangyi

{"title":"Angular Displacement as a Temporal Coordinate: A Geometric Framework for Rotational Dynamics","authors":"Pu Guangyi","doi":"10.1134/S1028335825600701","DOIUrl":"10.1134/S1028335825600701","url":null,"abstract":"Traditional special relativity (SR) exhibits limitations in describing rotating reference frames, particularly due to ambiguities in the definition of simultaneity and the inapplicability of Lorentz transformations. While general relativity (GR) addresses rotational effects through metric theory, its complexity and focus on point-mass systems render it less accessible for engineering applications. To overcome these challenges, an alternative framework [1] has systematically defined angular displacement space–time (φ(τ)), where φ denotes angular displacement (in radians) and τ represents temporal progression. This framework introduces an alternative Lorentz transformation tailored to rotational physical laws and establishes a universal rotational speed limit, Ωmax = c/(2π), analogous to the universal speed limit c. By postulating complex time (Time = t + iτ), where t is linear time and τ is angular time, this theory separates linear and rotational dimensions, forming a kinematic symmetry hypothesis. The angular displacement space–time (φ(τ)) framework offers a concise toolkit for analyzing rotational phenomena across disciplines, including rotor dynamics, astrophysics, fluid mechanics, and quantum systems. Its potential lies in bridging relativity and quantum mechanics under rotational contexts. Currently, the theory remains in a kinematic phase, necessitating experimental validation—particularly for the Ωmax postulate—and mathematical refinement to transition toward dynamic formulations. Should experiments refute Ωmax, the symmetry framework would collapse, yet the exploratory process could still yield novel techniques (e.g., ultra-high-speed rotational measurement) or mathematical constructs (e.g., engineering applications of complex time). Regardless of outcomes, angular displacement space–time (φ(τ)) constitutes a distinct mathematical framework with profound interdisciplinary relevance.","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"71 1","pages":"1 - 9"},"PeriodicalIF":0.5,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147865651","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

Laser Ultra-Nanoablation of Diamond Free from Color Center Generation 激光超纳米烧蚀无色心金刚石的研究

IF 0.5 4区物理与天体物理

Doklady Physics Pub Date : 2026-04-20 DOI: 10.1134/S1028335825600786

V. P. Pashinin, M. A. Dezhkina, N. D. Kurochitsky, K. Kh. Ashikkalieva, T. V. Kononenko, V. V. Kononenko, V. I. Konov

引用次数: 0

Thermal Analysis for Noise and Linearity Parameters of Junctionless Surround-Gate Graded Channel MOSFET 无结环栅梯度沟道MOSFET的噪声和线性参数热分析

IF 0.5 4区物理与天体物理

Doklady Physics Pub Date : 2026-04-20 DOI: 10.1134/S1028335825600816

Vidyadhar Gupta, Vedvrat, Alok Kumar, Vivek Patel

{"title":"Thermal Analysis for Noise and Linearity Parameters of Junctionless Surround-Gate Graded Channel MOSFET","authors":"Vidyadhar Gupta,  Vedvrat, Alok Kumar, Vivek Patel","doi":"10.1134/S1028335825600816","DOIUrl":"10.1134/S1028335825600816","url":null,"abstract":"In communication systems, noise becomes an important performance metric for any electronic component; in this case, it reduces the effectiveness of MOSFETs in carrying out their activities at the nanoscale. In this paper, investigated the thermal analysis for noise, linearity parameters and HCI degradation for junctionless surround-gate graded channel (JL-SG-GC) MOSFET. The noise parameters examined using NFmin, Real Z0, ACF (〈V1V1*〉 and 〈V2V2*〉 ) CCF (Re〈V1V2*〉 and Img〈V1V2*〉 ), and NC. Noise characteristics have been simulated using ATLAS 3D device simulator at a frequency of 1 THz for different temperature variation. The noise parameter is the lowest when compared to existing structures when temperature rises, which demonstrates that the JL-SG-GC is suitable for analog, low noise performance application. Additionally, linearity metrics have been examined, and the findings indicate that, in comparison to other structures, the JL-SG-GC MOSFET’s features are the most important. As a result, it is a better structure than others for communication applications at high temperature.","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"71 1","pages":"31 - 39"},"PeriodicalIF":0.5,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147865683","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

Erratum to: Interface Trap-Induced Impact in Linearity and Small-Signal Performance of InAs-Channel TFETs: Reliability Implications 接口陷阱诱导对InAs-Channel tfet线性和小信号性能的影响：可靠性影响

IF 0.5 4区物理与天体物理

Doklady Physics Pub Date : 2026-01-12 DOI: 10.1134/S102833582501001X

Vedvrat, Rajeev Kumar Sachan

引用次数: 0

An Optimized Deep Learning Framework for Turbulence Modeling 湍流建模的优化深度学习框架

IF 0.5 4区物理与天体物理

Doklady Physics Pub Date : 2025-12-12 DOI: 10.1134/S1028335825600713

Roohollah Mahoori, Zeinab Pouransari, Behnam Pourpooneh

{"title":"An Optimized Deep Learning Framework for Turbulence Modeling","authors":"Roohollah Mahoori, Zeinab Pouransari, Behnam Pourpooneh","doi":"10.1134/S1028335825600713","DOIUrl":"10.1134/S1028335825600713","url":null,"abstract":"The recent rise of machine learning in computer engineering, serving purposes such as prediction, image processing, classification, and clustering, has extended into various scientific fields. Recently, neural networks have been developed to be integrated with Reynolds-averaged Navier–Stokes (RANS) modeling to improve the prediction of turbulent flow. In this study, a multilayer perceptron network (MLP) and a cascade MLP network will be trained to predict the turbulent eddy viscosity (({nu _t})) and the Reynolds stress (({R_{ij}})). To predict the eddy viscosity, input variables are selected from high-fidelity data at <img>. First, they are grouped based on feature importance to determine input categories for the MLP network, and then the performance of each group is evaluated. All studied groups demonstrated acceptable performance; among them, the model closest to the direct numerical simulation (DNS) solution was identified. In the spectrum of input variables, the wall distance emerged as the paramount parameter, boasting the highest feature importance value among the variables considered. To assess the accuracy of the neural network, the prediction of turbulent viscosity is carried out at <img>. The output of the MLP network and the strain-rate tensor are considered as the input of the cascade MLP network to investigate the effect of these inputs on Reynolds stress prediction. The cascade MLP and MLP networks demonstrated acceptable accuracy in predicting Reynolds stress and eddy viscosity, with their results indicating a strong correlation between the outputs of the two neural networks.","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"70 9-12","pages":"92 - 100"},"PeriodicalIF":0.5,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145950712","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

Analysis of the Viscous Dissipation and Nonlinear Velocity Slip Effect on the Thin Film Nanofluid Flow 薄膜纳米流体流动的粘性耗散和非线性速度滑移效应分析

IF 0.5 4区物理与天体物理

Doklady Physics Pub Date : 2025-12-12 DOI: 10.1134/S1028335825600579

Ananya V. Kamath, V. Puneeth, Sini Katharin

{"title":"Analysis of the Viscous Dissipation and Nonlinear Velocity Slip Effect on the Thin Film Nanofluid Flow","authors":"Ananya V. Kamath, V. Puneeth, Sini Katharin","doi":"10.1134/S1028335825600579","DOIUrl":"10.1134/S1028335825600579","url":null,"abstract":"In the contemporary study, the dynamics of the nanofluid thin film is investigated by considering the viscous dissipation and chemical reaction effects. Additionally, the surface is assumed to have a nonlinear slip rather than the conventional no-slip conditions. This helps in better flow and heat transfer characteristics. This nonlinear velocity slip at the boundary is modelled using the idea proposed by Thompson and Troian. Also, the presence of viscous dissipation in the energy equation, depicts the loss of energy due to the internal friction. Hence, the viscous dissipation turns out to be a critical factor in determining the thermal properties of the nanofluid thin film. The chemical reactions take place within the system because of the presence of nanoparticles, that in turn will have a significant impact on the mass transfer characteristics of the thin film nanofluid. The incorporation of the similarity transformation helps in converting the partial differential equations (PDEs) that govern the fluid flow into a system of nonlinear ordinary differential equations (ODEs). This resulting system is then solved using the BVP package in python whose accuracy is assessed through residual analysis. By this error analysis, convergence of residues was confirmed. Thus validating the method and the results obtained. The outcomes of the study are interpreted through the graphs which highlighted the intensification of heat transfer for the increase in the Eckert number while the magnetic field confirmed its flow controlling feature. Also, the streamlines and contours were plotted to understand and visulaise the flow, all these contours showed the significance of the presence of nonlinear velocity slip at the boundary.","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"70 9-12","pages":"78 - 91"},"PeriodicalIF":0.5,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145950713","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

Technical Devices for Obtaining Equilibrium Radiation 获得平衡辐射的技术装置

IF 0.5 4区物理与天体物理

Doklady Physics Pub Date : 2025-11-20 DOI: 10.1134/S1028335825700120

D. V. Kosenkov, V. V. Sagadeev

引用次数: 0

Enhancing the Figure of Merit in Fano Resonance Sensors with Weyl Semimetals for Skin Cancer Detection 用于皮肤癌检测的Weyl半金属增强法诺共振传感器的优值

IF 0.5 4区物理与天体物理

Doklady Physics Pub Date : 2025-11-20 DOI: 10.1134/S102833582560066X

B. Roumi, V. Fallahi

{"title":"Enhancing the Figure of Merit in Fano Resonance Sensors with Weyl Semimetals for Skin Cancer Detection","authors":"B. Roumi, V. Fallahi","doi":"10.1134/S102833582560066X","DOIUrl":"10.1134/S102833582560066X","url":null,"abstract":"Over the past few decades, optical sensors based on surface plasmon resonance (SPR) in attenuated total reflection (ATR) configurations have emerged as powerful tools for label-free biochemical sensing. SPR high sensitivity to refractive index variations enables precise monitoring of molecular interactions. Here, we propose a novel SPR-based sensor that employs Weyl semimetal (WSM) to excite low-loss surface plasmon polaritons (SPPs) in the mid-infrared regime, optimized for skin cancer detection. The designed structure supports a sharp Fano resonance (FR) localized at the WSM and sensing medium interface. This FR manifests as an asymmetric lineshape with an ultra-narrow width, significantly enhancing sensitivity to refractive index changes in the analyte. Numerical simulations demonstrate that the SPP mode resonance angle exhibits exceptional sensitivity (S = 113.50°/RIU) and an ultra-high figure of merit (FOM = 22 700 RIU–1) to the dielectric environment. This performance makes the sensor ideal for detecting subtle biomolecular shifts associated with early-stage skin cancer biomarkers. We also systematically investigate the influence of the WSM layer Fermi energy and node separation length on sensor performance. These parameters critically govern SPP dispersion and loss characteristics, enabling spectral tunability across the mid-IR range.","PeriodicalId":533,"journal":{"name":"Doklady Physics","volume":"70 5-8","pages":"53 - 60"},"PeriodicalIF":0.5,"publicationDate":"2025-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145950766","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