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An effective stress-based DSC model for predicting hydromechanical shear behavior of unsaturated collapsible soils subjected to initial shear stress

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Journal of Rock Mechanics and Geotechnical Engineering 2025年第1期17卷 539-555页

作者： Saman Soleymani Borujerdi S.Mohsen Haeri Amir Akbari Garakani Chandrakant SDesai Civil Engineering department Sharif University of TechnologyTehranIran Power Industry Structures Research department Niroo Research InstituteTehranIran department of Civil and Architectural Engineering and Mechanics University of ArizonaArizonaUSA

Evaluation of hydromechanical shear behavior of unsaturated soils is still a challenging issue. The time and cost needed for conducting precise experimental investigation on shear behavior of unsaturated soils have encouraged several investigators to develop analytical, empirical, or semi-empirical models for predicting the shear behavior of unsaturated soils. However, most of the previously proposed models are for specimens subjected to the isotropic state of stress, without considering the effect of initial shear stress. In this study, a hydromechanical constitutive model is proposed for unsaturated collapsible soils during shearing, with consideration of the effect of the initial shear stress. The model implements an effective stress-based disturbed state concept (DSC) to predict the stress-strain behavior of the soil. Accordingly, material/state variables were defined for both the start of the shearing stage and the critical state of the soil. A series of laboratory tests was performed using a fully automated unsaturated triaxial device to verify the proposed model. The experimental program included 23 suction-controlled unsaturated triaxial shear tests on reconstituted specimens of Gorgan clayey loess wetted to different levels of suctions under both isotropic and anisotropic stress states. The results show excellent agreement between the prediction by the proposed model and the experimental results.

关键词： Unsaturated collapsible soil Initial shear stress Hydromechanical shear behavior Effective stress Disturbed state concept Critical state

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Rainfall-induced wind erosion in soils stabilized with alkali-activated waste materials

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Journal of Rock Mechanics and Geotechnical Engineering 2025年第1期17卷 465-480页

作者： Alireza Komaei Abbas Soroush Seyed Mohammad Fattahi Hesam Ghanbari department of Civil and Environmental Engineering Amirkabir University of TechnologyTehran159163431Iran

This study evaluates the efficacy of sustainable erosion control using slag-based alkali-activated cement crusts under varying rainfall and wind conditions. The rainfall intensities ranged from 30 mm/h to 120 mm/h, with durations ranging from 15 min to 90 min, and crust slopes of ∼2° (gentle) and 30° (steep). Wind tunnel experiments were conducted at wind velocities of 14 m/s, 21 m/s, and 28 m/s to investigate post-rainfall wind erodibility, along with changes in crust strength and microstructure analysis. The findings show the development of hydrated cementitious phases in alkali-activated material, which form around and between the particles during the alkaline activation process. Alkali-activated cement crusts significantly reduced erosion caused by rainfall and subsequent wind by several orders of magnitude. At the highest rainfall intensity of 120 mm/h, rainfall erosion was measured to be 1654.81 kg/m2 for untreated samples and 0.89 kg/m2 for treated samples, demonstrating a substantial 99.95% reduction in erosion due to the treatment. Similarly, at the highest wind speed tested, wind erosion was 122.75 kg/m2 for untreated samples and 0.095 kg/m2 for treated samples, indicating a significant 99.92% reduction in erosion due to the formation of an alkali-activated cement crust on the soil surface. However, exposure of the samples to 120 mm/h rainfall for 90 min resulted in a 5.2-fold increase in wind erosion compared to pre-rainfall conditions. Similarly, penetrometer results indicated a 37%–54% reduction in post-rainfall surface strength.

关键词： Rainfall erosion Alkali-activated material Wind erosion Crust formation

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Tunable and wideband high-performance rare earth-doped Ni-Mg-Cu-Zn nano ferrite-based meta-absorbers for C-band application

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Journal of Rare Earths 2025年第1期43卷 124-132,I0005页

作者： Majid Niaz Akhtar Magbool Alelyani Fatimah Mohammed AAlzahrani Abdullah Almohammedi Sabih Qamar MABaqir MIrfan Muhammad Azhar Khan Kheir SAlbarkaty ZAAlrowaili MSAl-Buriahi Institute of physics The Islamia University of Bahawalpur63100BahawalpurPakistan department of Radiological Sciences College of Applied Medical ScienceKing Khalid University61421bhaSaudi Arabia department of Chemistry College of SciencePrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabi department of physics Faculty of ScienceIslamic University of Madinah42352.Saudi Arabia department of Chemical Engineering Muhammad Nawaz Sharif University of Engineering and Technology(MNSUET)60000MultanPakistan department of Electrical and Computer Engineering COMSATS University IslamabadSahiwal Campus57000Pakistan department of physics Umm Al-Qura UniversityMakkah24382Saudi Arabia department of physics College of ScienceJouf UniversityP.O.Box:201474331SakakaSoudi Arabia department of physics Sakarya University6900SakaryaTurkey

Due to advanced technology,electromagnet interference and dissipation problems in the electronic and portable devices at GHz range are increasing *** absorbing materials with outstanding electromagnetic properties,wide bandwidth,and strong absorption are highly *** present investigation deals with the preparation of Ni-Mg-Cu-Zn(NMCZ)substituted nano ferrites with composition of Ni_(0.3)Mg_(0.2)Cu_(0.3)Zn_(0.2)X_(0.02)Fe_(1.98)O_(4)(X=Nd,Ho,Pr,Gd,Yb).X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),a vibratory sample magnetometer(VSM),and a Vector network analyzer(VNA)were used to investigate these rare earth-doped nanocrystalline ferrites'*** reveals the single spinel phase structure in all Ni-Mg-Cu-Zn *** spectroscopy shows the presence of tetrahedral and octahedral bands of spinel *** images reveal the lowest agglomeration for the Ho-doped NMCZ nano-spinel ferrites *** images show the hexagon shapes of the Yb-and Nd-doped NMCZ ***-doped NMCZ ferrites show more coercivity than other rare earth metals substituted NMCZ nanocrystalline *** analysis was used to calculate the magnetic features like initial permeability,magnetic anisotropy constant,remanence,coercivity,and magnetic ***-frequency switching field distributions(SFD)analyses were also *** characteristics such as losses,permittivity,modulus,Q,ac conductivity,and impedance of the Nd^(-),Ho^(-),Pr^(-),Gd^(-),Yb-doped Ni-Mg-Cu-Zn ferrites were *** minimum reflection loss(-57.3 dB)is found at 1.4 GHz for Pr-doped Ni-Mg-Cu-Zn ferrite ***,the reflection loss(RL)of-53.9 dB at 2.9 GHz is observed for Ho-doped Ni-Mg-Cu-Zn ferrite *** magnetization,low coercivity,outstanding magnetodielectric,and absorption properties of theNd^(-),Ho^(-),Pr^(-),Gd^(-)and Yb^(-)doped Ni-Mg

关键词： Rare earths Reflection loss Cubic phase Magnetodielectric Ni-Mg-Cu-Zn(NMCZ)meta-absorber

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Evaluation of Transmutation of ^137Cs（γ, n） 136Cs Using Ultra-Intense Lasers in Solid Targets

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Chinese physics Letters 2006年第6期23卷 1434-1436页

作者： R. Sadighi-Bonabi O. Kokabee department of physics Sharif University of Technology 11365-9161 Tehran Iran department of Mechanical Engineering Sharif University of Technology 11365-9567 Tehran Iran Bonab Research Centre 56515-196 Bonab Azerbaijan province Iran

Relativistic electrons produced in ultra-intense laser-solid interaction generate highly collimated γ-ray beams through Bremsstrahlung that can be used to induce photonuclear reactions. Photonuclear transmutation （of （% n） type） of ^137 Cs, one of the hazardous nuclear wastes with half-life of 30.17 years which cannot be transmuted practically with neutron bombardment due to its very low neutron capture cross section, has been considered. Nuclear activity of produced 136Cs with half-life of 13.16 days has been evaluated analytically using available experimental data. With irradiating a ^137Cs sample by p-polarized laser light of 10^20 Wcm^-2 and the repetition rate of 10Hz for 30min, the activity of 0.24 Bq is obtained. It is found that intensity has a large effect in yield around 10^21 Wcm^-2. For similar laser with intensity of 5 ×10^21 Wcm^-2, the activity increases with a factor of 10^5.

关键词： Transmutation 137Cs(γ,n) Solid Targets

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Fibrotic liver extracellular matrix induces cancerous phenotype in biomimetic micro-tissues of hepatocellular carcinoma model

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Hepatobiliary & Pancreatic Diseases International 2025年第1期24卷 92-103页

作者： Kosar Nouri Abbas Piryaei Homeyra Seydi Ibrahim Zarkesh Ibrahim Ghoytasi Bahare Shokouhian Mustapha Najimi Massoud Vosough department of Developmental Biology University of Science and CultureACECR 14155-4364 TehranIran department of Regenerative Medicine Cell Science Research CenterRoyan Institute for Stem Cell Biology and TechnologyACECR 14155-4364 TehranIran department of Stem Cells and Developmental Biology Cell Science Research CenterRoyan Institute for Stem Cell Biology and TechnologyACECR 14155-4364 TehranIran department of Biology and Anatomical Sciences School of MedicineShahid Beheshti University of Medical SciencesTehranIran department of Tissue Engineering and Applied Cell Sciences School of Advanced Technologies in MedicineShahid Beheshti University of Medical SciencesTehranIran department of Cell Engineering Cell Science Research CenterRoyan Institute for Stem Cell Biology and TechnologyACECR 14155-4364 TehranIran department of Medical Biotechnology School of Advanced Technologies in MedicineTehran University of Medical SciencesTehranIran Laboratory of Pediatric Hepatology and Cell Therapy Institute of Experimental and Clinical Research(IREC)UCLouvainBrusselsBelgium Experimental Cancer Medicine Institution for Laboratory MedicineKarolinska InstituteStockholmSweden

Background: Despite considerable advancements in identifying factors contributing to the development of hepatocellular carcinoma(HCC), the pathogenesis of HCC remains unclear. In many cases, HCC is a consequence of prolonged liver fibrosis, resulting in the formation of an intricate premalignant microenvironment. The accumulation of extracellular matrix(ECM) is a hallmark of premalignant microenvironment. Given the critical role of different matrix components in regulating cell phenotype and function, this study aimed to elucidate the interplay between the fibrotic matrix and malignant features in HCC. Methods: Liver tissues from both control(normal) and carbon tetrachloride(CCl_(4))-induced fibrotic rats were decellularized using sodium dodecyl sulfate(SDS) and Triton X-100. The resulting hydrogel from decellularized ECM was processed into micro-particles via the water-in-oil emulsion method. Microparticles were subsequently incorporated into three-dimensional liver biomimetic micro-tissues(MTs) comprising Huh-7 cells, human umbilical vein endothelial cells(HUVECs), and LX-2 cells. The MTs were evaluated using the 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium(MTS) assay at day 11, immunofluorescence staining, immunoblotting, and spheroid migration assay at day 14 after co-culture. Results: Fibrotic matrix from CCl4-treated rat livers significantly enhanced the growth rate of the MTs and their expression of CCND1 as compared to the normal one. Fibrotic matrix, also induced the expression of epithelial-to-mesenchymal transition(EMT)-associated genes such as TWIST1, ACTA2, MMP9, CDH2, and VIMENTIN in the MTs as compared to the normal matrix. Conversely, the expression of CDH1 and hepatic maturation genes HNF4A, ALB, CYP3A4 was decreased in the MTs when the fibrotic matrix was used. Furthermore, the fibrotic matrix increased the migration of the MTs and their secretion of alpha-fetoprotein. Conclusions: Our findings suggest a

关键词： Liver fibrosis Decellularized extracellular matrix Spheroid Epithelial-to-mesenchymal transition Cell differentiation Hepatocellular carcinoma

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Investigation of a mutual interaction force at different pressure amplitudes in sulfuric acid

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Chinese physics B 2011年第8期20卷 454-459页

作者： Nastaran Rezaee Rasoul Sadighi-Bonabi Mona Mirheydari Homa Ebrahimi department of physics Sharif University of Technology11365-91TehranIran department of physics Islamic Azad University Central Tehran BranchTehranIran

This paper investiages the secondary Bjerknes force for two oscillating bubbles in various pressure amplitudes in a concentration of 95% sulfuric acid. The equilibrium radii of the bubbles are assumed to be smaller than 10 μm at a frequency of 37 kHz in various strong driving acoustical fields around 2.0 bars （1 bar=10^5 Pa）. The secondary Bjerknes force is investigated in uncoupled and coupled states between the bubbles, with regard to the quasi-adiabatic model for the bubble interior. It finds that the value of the secondary Bjerknes force depends on the driven pressure of sulfuric acid and its amount would be increased by liquid pressure amplitude enhancement. The results show that the repulsion area of the interaction force would be increased by increasing the driven pressure because of nonlinear oscillation of bubbles.

关键词： multi-bubble sonoluminescence secondary Bjerknes force coupled and uncoupled state,nonlinear oscillation

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A Unified Optimization-Based Framework to Adjust Consensus Convergence Rate and Optimize the Network Topology in Uncertain Multi-Agent Systems

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IEEE/CAA Journal of Automatica Sinica 2021年第9期8卷 1539-1548页

作者： Mohammad Saeed Sarafraz Mohammad Saleh Tavazoei department of Electrical Engineering Sharif University of TechnologyTehran 11365-9363Iran

This paper deals with the consensus problem in an uncertain multi-agent system whose agents communicate with each other through a weighted undirected(primary)*** considered multi-agent system is described by an uncertain state-space model in which the involved matrices belong to some matrix *** the main contribution of the paper,a unified optimization-based framework is proposed for simultaneously reducing the weights of the edges of the primary communication graph(optimizing the network topology)and synthesizing a controller such that the consensus in the considered uncertain multi-agent system is ensured with an adjustable convergence *** the NP-hardness nature of the optimization problem related to the aforementioned framework,this problem is relaxed such that it can be solved by regular LMI ***/practical-based examples are presented to verify the usefulness of the obtained results.

关键词： Convergence-rate element-wise uncertainty robust controller topology design

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A model-driven approach to semi-structured database design

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Frontiers of Computer Science 2015年第2期9卷 237-252页

作者： Amir JAHANGARD-RAFSANJANI Seyed-Hassan MIRIAN-HOSSEINABADI department of Computer Engineering Sharif University of Technology Tehran 11365-11155 Iran

Recently XML has become a standard for data representation and the preferred method of encoding struc- tured data for exchange over the Internet. Moreover it is fre- quently used as a logical format to store structured and semi- structured data in databases. We propose a model-driven and configurable approach for modeling hierarchical XML data using object role modeling （ORM） as a flat conceptual model. First a non-hierarchical conceptual schema of the problem domain is built using ORM and then different hierarchical views of the conceptual schema or parts of it are specified by the designer using transformation rules. A hierarchical mod- eling notation called H-ORM is proposed to show these hier- archical views and model more complex semi-structured data constructs and constraints. We also propose an algorithm to map hierarchical H-ORM views to XML schema language.

关键词： semi-structured database design object rolemodeling model driven approach

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Assessment of leachate-contaminated clays using experimental and artificial methods

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Journal of Rock Mechanics and Geotechnical Engineering 2025年第1期17卷 524-538页

作者： Hossein Moradi Moghaddam Ahmad Fahimifar Taghi Ebadi Mohsen Keramati Sumi Siddiqua department of Civil&Environmental Engineering Amirkabir University of TechnologyTehran***Iran Faculty of Civil Engineering Shahrood University of TechnologyShahrood***Iran School of Engineering University of British ColumbiaKelownaV6T 1Z4Canada

The investigation of leachate-contaminated clay(LCC)is essential for landfill engineering assessment and achievement of sustainable development *** static and dynamic laboratory tests,including unconfined compressive strength(UCS),California bearing ratio(CBR),and cyclic simple shear,are *** simple shear experiments on LCCs were performed to evaluate the damping and shear *** investigated factors are vertical load(VL),leachate content(LC),frequency(F),and shear strain(ShS)for ***-based investigation optimization(FBIO)and equilibrium optimizer algorithm(EOA)were utilized in addition to multiple types of ensemble models,including adaptive boosting(ADB),gradient boosting regression tree(GBRT),extreme gradient boosting(XGB) and random forest(RF).The comparison of the methods showed that GBRT-FBIO and XGB-EOA models outperformed other models for shear modulus and damping of *** p-value less than 0.0001 shows the significance of the used models in the response surface methodology(RSM)method.

关键词： Contaminated liner Dynamic parameter Response surface methodology(RSM) Python method

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Electron trajectory evaluation in laser-plasma interaction for effective output beam

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Chinese physics B 2010年第6期19卷 344-348页

作者： P. Zobdeh R. Sadighi-Bonabi H. Afarideh department of physics Qom Branch Islamic Azad University Qom Iran department of physics Sharif University of Technology 11365-9567 Tehran Iran department of physics Amirkabir University of Technology Tehran Iran

Using the ellipsoidal cavity model, the quasi-monoenergetic electron output beam in laser-plasma interaction is described. By the cavity regime the quality of electron beam is improved in comparison with those generated from other methods such as periodic plasma wave field, spheroidal cavity regime and plasma channel guided acceleration. Trajectory of electron motion is described as hyperbolic, parabolic or elliptic paths. We find that the self-generated electron bunch has a smaller energy width and more effective gain in energy spectrum. Initial condition for the ellipsoidal cavity is determined by laser-plasma parameters. The electron trajectory is influenced by its position, energy and cavity electrostatic potential.

关键词： electron intense laser plasma accelerator laser wake field bubble regime wave breaking

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