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Improving the Surface Roughness of Dental Implant Fixture by Considering the Size,Angle and Spraying Pressure of Sandblast Particles

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Journal of Bionic Engineering 2024年第1期21卷 303-324页

作者： Ehsan Anbarzadeh bijan Mohammadi School of Mechanical Engineering Iran University of Science and TechnologyTehranIran

In this study,different conditions of sandblasting on dental implant fixtures were investigated to achieve the best sandblasting conditions.18 different sandblasting conditions(Using 152 implant fixture samples)were examined,including parameters such as particle size,particle blasting pressure,and particle blasting *** surface treatment of the samples was performed using the SLA+Anodizing *** testing was performed for each of the 18 different states,and the average surface roughness of each of these was compared with each ***,a bone layer was placed on the sample with the closest average surface roughness to the standard and the least amount of aluminum oxide on its surface among the 18 different states,to confirm the accuracy and quality of the desired surface roughness by examining the bone formation process and *** results showed that state No.4(sandblast particle size:75µm,spraying pressure of sandblast particles:4 bar,sandblast particle spraying angle:30 degrees),which was prepared using the SLA+Anodizing method and had a surface roughness of 1.989µm(The percentage of Al_(2)O_(3)on the surface=6%),had the best sandblasting conditions and showed 95%cell viability and accelerated the treatment and bone formation process for about a *** simulation results,using Abaqus software,indicated that the stress distribution on the surface of the implant fixture in contact with the bone surface has increased by approximately 4.3%for state *** will help prevent loosening of the dental implant fixture over time.

关键词： Dental implants Surface treatment Sandblast Surface roughness Osseointegration

Cancer immunotherapy with envelopedself-amplifying mRNA CARG-2020 thatmodulates IL-12,IL-17 and PD-L1 pathways toprevent tumor recurrence

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Acta Pharmaceutica Sinica B 2024年第1期14卷 335-349页

作者： Ju Chen Bhaskara Reddy Madina Elham ahmadi Timur Olegovich Yarovinsky Marie Marthe Krady Eileen Victoria Meehan Isabella China Wang Xiaoyang Ye Elise Pitmon Xian-Yong Ma bijan Almassian Valerian Nakaar Kepeng Wang Department of Immunology School of MedicineUniversity of Connecticut Health CenterFarmingtonCT 06030USA CaroGen Corporation FarmingtonCT 06030USA The Eighth Clinical Medical College of Guangzhou University of Chinese Medicine Foshan Hospital of Traditional Chinese MedicineFoshan 528000China The Loomis Chaffee School WindsorCT 06095USA

Targeting multiple immune mechanisms may overcome therapy resistance and further improve cancer immunotherapy for ***,we describe the application of virus-like vesicles(VLV)for delivery of three immunomodulators alone and in combination,as a promising approach for cancer *** vectors were designed to deliver single chain interleukin(IL)-12,shorthairpin RNA(shRNA)targeting programmed death ligand 1(PD-L1),and a dominant-negative form of IL-17 receptor A(dn-IL17RA)as a single payload or as a combination *** delivery of the VLV vector expressing IL-12 alone,as well as the trivalent vector(designated CARG-2020)eradicated large established ***,only CARG-2020 prevented tumor recurrence and provided long-term survival benefit to the tumor-bearing mice,indicating a benefit of the combined *** abscopal effects of CARG-2020 on the non-injected contralateral tumors,as well as protection from the tumor cell re-challenge,suggest immune-mediated mechanism of protection and establishment of immunological ***,CARG-2020 potently activates Th1 immune mechanisms and inhibits expression of genes related to T cell exhaustion and cancer-promoting *** ability of CARG-2020 to prevent tumor recurrence and to provide survival benefit makes it a promising candidate for its development for human cancer immunotherapy.

关键词： Virus-like vesicles Oncolytic virus IL-12 IL-17 PD-L1 T cell exhaustion Combination therapy Cancer immunotherapy

Analysis of the overall pressure balance loop for a methanol-to-olefins dual fluidized bed reactor-regenerator

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Particuology 2023年第11期82卷 13-24页

作者： bijan Hejazi Neda Shabany Chemical Engineering Department Faculty of EngineeringFerdowsi University of MashhadMashhad***Iran Petrochemical Research and Technology Co. TehranIran

Development of a comprehensive reactor model is of paramount importance for design and scale-up of methanol-to-olefins (MTO) process in a dual fluidized bed reactor (DFB). These models must integrate suitable reaction kinetic expressions with hydrodynamic models properly descriptive of gas-solid contact in fluidized bed reactors. In this modeling study, our previously developed kinetic models of MTO fluidized bed reactor and regenerator are coupled with overall mass, energy and pressure balances to ensure smooth circulation of catalyst particles between the two fluidized beds. This integrated model was then applied to determine geometric dimensions of a demo-scale MTO DFB configuration and to obtain the mass distribution of catalyst particles throughout the entire system including the pipes connecting the two reactors. Our model is capable of being integrated into simulation software such as Aspen Plus for plant-wide optimization and scale-up studies.

关键词： Pressure balance loop Methanol-to-olefins Dual fluidized bed SAPO-34 catalyst

Prediction of mode I fracture toughness of rock using linear multiple regression and gene expression programming

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第5期14卷 1421-1432页

作者： bijan Afrasiabian Mosleh Eftekhari Department of Mining Engineering Science and Research BranchIslamic Azad UniversityTehranIran Department of Mining Engineering Faculty of EngineeringTarbiat Modares UniversityTehranIran

Prediction of mode I fracture toughness(KIC) of rock is of significant importance in rock engineering analyses. In this study, linear multiple regression(LMR) and gene expression programming(GEP)methods were used to provide a reliable relationship to determine mode I fracture toughness of rock. The presented model was developed based on 60 datasets taken from the previous literature. To predict fracture parameters, three mechanical parameters of rock mass including uniaxial compressive strength(UCS), Brazilian tensile strength(BTS), and elastic modulus(E) have been selected as the input parameters. A cluster of data was collected and divided into two random groups of training and testing ***, different statistical linear and artificial intelligence based nonlinear analyses were conducted on the training data to provide a reliable prediction model of KIC. These two predictive methods were then evaluated based on the testing data. To evaluate the efficiency of the proposed models for predicting the mode I fracture toughness of rock, various statistical indices including coefficient of determination(R2),root mean square error(RMSE), and mean absolute error(MAE) were utilized herein. In the case of testing datasets, the values of R2, RMSE, and MAE for the GEP model were 0.87, 0.188, and 0.156,respectively, while they were 0.74, 0.473, and 0.223, respectively, for the LMR model. The results indicated that the selected GEP model delivered superior performance with a higher R2value and lower errors.

关键词： Mode I fracture Toughness Critical stress intensity factor Linear multiple regression(LMR) Gene expression programming(GEP)

Drivers of Forecasting the Behavioral Intention and Acceptance Behavior of the Hail Canon Technology(HCT): Using Logistic and System Dynamics Modeling

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Chinese Geographical Science 2023年第3期33卷 549-564页

作者： ABADI bijan HAGHANINIA Mohammad Faculty of Agriculture University of MaraghehGolshahr Town 55181-83111Iran

Globally known about the drivers through which farmers are instigated to uphold and use Hail Canon Technology(HCT)is ***,this article intended to examine the drivers of forecasting the behavioral intention and acceptance behavior of the HCT,249 apple farmers from northwestern Iran were recruited,including adopters(n1=114)and non-adopters(n2=135).The conceptual foundation included demographic theory,resource-based theory,theory of planned behavior,innovation diffusion model,and institutional support *** also used the system dynamics model(SDM)in the Netlogo to assess the results of the conventional statistical approach(i.e.,the logistic model).Authenticated the fitness of conceptual model with the data,logistic model manifests that the most outstanding determinants of the acceptance of HCT entail age,experience,total land size,income,attitude,compatibility,visibility,relative advantage,and financial *** the SDM,it was also shown that the results of the logistic model are confirmed by the *** conclusion,management implications are available for the university extension to eliminate the adoption obstacles and stir up farmers to join in applying HCT,furthermore,researchers would avail themselves of remarks for future research.

关键词： Canon visibility furthermore

Determinants of Adaptation to Climate Change:A Case Study of Rice Farmers in Western Province,Iran

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Chinese Geographical Science 2022年第1期32卷 110-126页

作者： JAMSHIDI Alireza JAMSHIDI Masomeh ABADI bijan Department of Geography Faculty of Literature and HumanitiesUrmia UniversityUrmia 57561-51818Iran Department of Entrepreneurship and Rural Development Ham UniversityHam 14666-64891Iran Department of Biosystem Mechanics Engineering Faculty of AgricultureUniversity of MaraghehMaragheh 55181-83111Iran

The decisions made by agricultural households to adjust to climate change(CC)in Iran are not well *** study is intended to investigate the influence of perceptions and socioeconomic,institutional features on farmers’adaptation decisions about CC,which constitute the hypothetical statements of the *** undertook a survey of 200 farm householders from 31 villages of Ilam Province,situated in the western Iran,as randomly *** result discloses that the proposed discriminant model matches the dataset well,with a strong effect size of partial eta-squared(η^(2)=0.38).The analysis further signals that adapters are younger and more welleducated than *** are also knowledgeable about CC risks and institutional policy *** adapters have subsidiary work,better access to credit,and have good contacts with expansion agents and *** paper concludes that government authorities should provide farmers with the enriched capabilities and competencies enabling them to adapt to CC.

关键词： climate change(CC) drought adaptation management rice farmers Iran

Characteristics of Statically Indeterminate Symmetric Flexure Structures

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Nanomanufacturing and Metrology 2023年第1期6卷 1-14页

作者： Yan-Ding Qin Yue-Yang Shi bijan Shirinzadeh Yan-Ling Tian Da-Wei Zhang College of Artificial Intelligence Nankai UniversityTianjinChina Department of Mechanical and Aerospace Engineering Monash UniversityMelbourneAustralia School of Mechanical Engineering Tianjin UniversityTianjinChina

Statically indeterminate symmetric(SIS)flexure structures are symmetric structures with“clamped-clamped”boundary *** static indeterminacy and topological symmetry significantly attenuate the parasitic motions associated with statically determinate flexure ***,SIS flexure structures feature decoupled linear and angular motions,improved motion accuracy,high stiffness,and high *** SIS flexure structures have been more frequently utilized as prismatic joints,they can also be utilized as revolute *** study systematically investigates the characteristics of SIS flexure *** on the unified compliance models of a single flexure hinge,analytical compliance models of two fundamental types of SIS flexure structures are *** 1-degree-of-freedom or planar applications,multiple SIS-based structures can also be integrated into various configurations to transmit linear or angular *** stiffness models are also *** characteristics and possible applications of the SIS flexure structures are computationally investigated through case ***,several SIS prototypes are manufactured,and the modeling accuracy of the established stiffness models is experimentally verified.

关键词： Statically indeterminate structure Flexure hinge Compliance modeling Prismatic joint

Multi-criteria prioritization of the renewable power plants in Australia using the fuzzy logic in decision-making method(FMCDM)

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Clean Energy 2022年第1期6卷 16-34页

作者： Amin Aryanfar Aslan Gholami Payam Ghorbannezhad bijan Yeganeh Mahdi Pourgholi Majid Zandi Svetlana Stevanovic Faculty of Mechanical and Energy Engineering Shahid Beheshti UniversityTehranIran Faculty of New Technologies and Energy Engineering Shahid Beheshti UniversityTehranIran Faculty of Civil Water&Environmental EngineeringShahid Beheshti UniversityTehranIran Centre for Air Pollution Energy and Health ResearchGlebeNew South Wales 2037Australia Faculty of Electrical Engineering Shahid Beheshti UniversityTehranIran Faculty of Science Engineering&Built EnvironmentSchool of EngineeringDeakin UniversityGeelongVictoria 3220Australia

The presented study focused on developing an innovative decision-making framework to select the best renewable-power-plant technologies,considering comprehensive techno-economic and environmental *** to the favourable conditions,Australia was selected as the case study.A fuzzy-logic method and analytical hierarchy process were applied to prioritize different renewable-energy power *** techno-economic factors included levelized cost of energy,initial cost,simple payback time,and operation and maintenance costs along with environmental factors including carbon payback time,energy payback time and greenhouse-gas emissions were used to rank the power *** results showed that the capital cost and simple payback time had the highest priority from an economic point of *** comparison,greenhouse-gas emissions and carbon payback time were the dominant environmental *** analysis results provided economic and environmental priority tables for developing different power plants in the current state and a future scenario by *** fuzzy results and pairwise composite matrix of alternatives indicated that the onshore wind,offshore wind,single-axis tracker polycrystalline photovoltaic,single-axis tracker monocrystalline photovoltaic,fix-tilted polycrystalline photovoltaic and fix-tilted monocrystalline photovoltaic scored the highest in the current *** contrast,by 2030,the single-axis tracker photovoltaic power plants will be the best choice in the future scenario in ***,the results were used and analysed to recommend and suggest several policy implementations and future research studies.

关键词： photovoltaic wind fuzzy logic analytical hierarchy process prioritization

The role of viscoelastic damping on retrofitting seismic performance of asymmetric reinforced concrete structures

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Earthquake Engineering and Engineering Vibration 2020年第1期19卷 223-237页

作者： Zeshan Alam Chunwei Zhang bijan Samali School of Civil Engineering Qingdao University of TechnologyQingdao 266033China Centre for Infrastructure Engineering Western Sydney UniversityPenrith NSW 2751Australia

The primary purpose of this research is to improve the seismic response of a complex asymmetric tall structure using viscoelastic(VE) dampers. Asymmetric structures have detrimental effects on the seismic performance because such structures create abrupt changes in the stiffness or strength that may lead to undesirable stress concentrations at weak locations. Structural control devices are one of the effective ways to reduce seismic impacts, particularly in asymmetric structures. For passive vibration control of structures, VE dampers are considered among the most preferred devices for energy dissipation. Therefore, in this research, VE dampers are implemented at strategic locations in a realistic case study structure to increase the level of distributed damping without occupying significant architectural space and reducing earthquake vibrations in terms of story displacements(drifts) and other design forces. It has been concluded that the seismic response of the considered structure retrofitted with supplemental VE dampers corresponded well in controlling the displacement demands. Moreover, it has been demonstrated that seismic response in terms of interstory drifts was effectively mitigated with supplemental damping when added up to a certain level. Exceeding the supplemental damping from this level did not contribute to additional mitigation of the seismic response of the considered structure. In addition, it was found that the supplemental damping increased the total acceleration of the considered structure at all floor levels, which indicates that for irregular tall structures of this type, VE dampers were only a good retrofitting measure for earthquake induced interstory deformations and their use may not be suitable for acceleration sensitive structures. Overall, the research findings demonstrate how seismic hazards to these types of structures can be reduced by introducing additional damping into the structure.

关键词： viscoelastic dampers seismic analysis asymmetric structure nonlinear modal time history analysis