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Combinatorial design-based quasi-cyclic LDPC codes with girth eight

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Digital Communications and Networks 2018年第4期4卷 296-300页

作者： sina Vail Narges Rezvani Majid College of Ertgineering Information Technology and Environment Charles Din-win UmversityEllengowan DriveNT0909Australia

This paper presents a novel regular Quasi-Cyclic (QC)Low Density Parity Check (LDPC)codes with columnweight three and girth at least *** are designed on the basis of combinatorial design in which subsets applied for the construction of circulant matrices are determined by a particular *** the nonexistence of cycles four and six in the structure of the parity check matrix,a bound for their minimum weight is *** simtdations conducted confirm that without applying a masking technique,the newly implemented codes have a performance similar to or better than other well-known *** is evident in the waterfall region, while their error floor at very low Bit Error Rate (BER)is expected.

关键词： Quasi-cyclic LDPC codes Combinatorial design Minimum weight Girth

ROSIC: Enhancing secure and accessible robot control through open‐source instant messaging platforms

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IET Cyber-Systems and Robotics 2024年第2期6卷 35-51页

作者： Rasoul Sadeghian Shahrooz Shahin sina Sareh RCA Robotics Laboratory Royal College of ArtLondonUK

Ensuring secure communication and seamless accessibility remains a primary challenge in controlling robots *** authors propose a novel approach that leverages open-source instant messaging platforms to overcome the complexities and reduce costs associated with implementing a secure and user-centred communication system for remote robot control named Robot Control System using Instant Communication(ROSIC).By leveraging features,such as real-time messaging,group chats,end-to-end encryption and cross-platform support inherent in the majority of instant messenger platforms,we have developed middleware that establishes a secure and efficient communication system over the *** using instant messaging as the communi-cation interface between users and robots,ROSIC caters to non-technical users,making it easier for them to control *** architecture of ROSIC enables various scenarios for robot control,including one user controlling multiple robots,multiple users con-trolling one robot,multiple robots controlled by multiple users,and one user controlling one ***,ROSIC facilitates the interaction of multiple robots,enabling them to interoperate and function collaboratively as a swarm system by providing a unified communication platform that allows for seamless exchange of data and *** was specifically chosen as the instant messaging platform by the authors due to its open-source nature,robust encryption,compatibility across multiple platforms and interactive communication capabilities through channels and ***,the ROSIC is designed to communicate effectively with robot operating system(ROS)-based robots to enhance our ability to control them remotely.

关键词： encryption interactive communication remote robot control secure communication

Progress in the development of vaccines for hepatitis C virus infection

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World Journal of Gastroenterology 2015年第42期21卷 11984-12002页

作者： Faezeh Ghasemi sina Rostami Zahra Meshkat Department of New Sciences and Technology Faculty of Medicine Mashhad University of Medical Sciences Department of Biology Faculty of Sciences Ferdowsi University of Mashhad The Influenza Centre Department of Clinical Science University of Bergen Antimicrobial Resistance Research Center Faculty of Medicine Mashhad University of Medical Sciences

The hepatitis C virus(HCV), first described in 1989, is now a leading cause of liver cirrhosis and hepatocellular carcinoma. With more than 170 million people infected globally, this virus is a major public health issue. The current standard therapy is based on interferon in combination with ribavirin. This costly therapy often fails to completely clear the infection and is associated with adverse side effects. Recent anti-HCV therapies are interferon-free direct-acting antiviral(DAA) regimens for HCV, including simeprevir, sofosbuvir, and ledipasvir, which have effects on non-structural proteins. DAA regimens have several advantages, such as specifically targeting HCV viral replication, accompanied by very high sustained virological response rates and lower side effects like flu-like syndrome. These facts plus the fact that most HCV cases progress to chronic infection suggest the potential need for an efficient HCV vaccine. Different innovative methods, including methods based on peptide, recombinant protein, DNA, vector-based, and virus-like particles, have been introduced for the development of HCV vaccines. An extensive number of studies have been published on these vaccines, and some vaccines were even tested in clinical trials. In the current review, progress in the development of preventive and therapeutic vaccines against the HCV is reviewed in the context of peptide vaccines, recombinant protein vaccines, HCV-like particle, DNA vaccines and viral vectors expressing HCV genes.

关键词： Preventive vaccine Therapeutic vaccine Hepatitis C

Sensitivity analysis of ground motion prediction equation using next generation attenuation dataset

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Geodesy and Geodynamics 2020年第1期11卷 40-45页

作者： sina Sabermahani Parisa Ashjanas Department of Earth Science Graduate University of Advanced TechnologyIran

Seismic hazard assessment is an important stage in earthquake *** the ground motion prediction equation(GMPE)has a key role in seismic hazard assessment,it is necessary to determine this equation as well as *** mutual seismic parameters,such as earthquake magnitude,distance,fault type,and site effect,are applied in *** ridge regression method is applied to find the relation between input seismic parameters and targets(PGA,PGV,PGD,SA(T=0.02 s),and SA(T=1 s)).Results of regression show that equations obtained in this study have a root mean square error(RMSE)of 90%.In the last part,GMPEs are inspected by sensitivity analysis through two methods:Sobol and Delta Moment-Independent *** results from the two methods were very similar to each other for each ***,the analysis shows that the most effective parameters in determining GMPEs are moment magnitude and shear wave velocity.

关键词： Ground motion prediction equation Ridge-regression Next generation attenuation Sobol Delta

Mechanochemical leaching of chalcopyrite concentrate by sulfuric acid

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International Journal of Minerals,Metallurgy and Materials 2016年第4期23卷 380-388页

作者： Farhad Khorramshahi Mohammadabad sina Hejazi Jalil Vahdati khaki Abolfazl Babakhani Materials and Metallurgical Engineering Department Faculty of Engineering Ferdowsi University of Mashhad Materials and Metallurgical Engineering Department Faculty of Engineering University of Tehran

This study aimed to introduce a new cost-effective methodology for increasing the leaching efficiency of chalcopyrite concentrates at ambient temperature and pressure. Mechanical activation was employed during the leaching（mechanochemical leaching） of chalcopyrite concentrates in a sulfuric acid medium at room temperature and atmospheric pressure. High energy ball milling process was used during the leaching to provide the mechanochemical leaching condition, and atomic absorption spectroscopy and cyclic voltammetry were used to determine the leaching behavior of chalcopyrite. Moreover, X-ray diffraction and scanning electron microscopy were used to characterize the chalcopyrite powder before and after leaching. The results demonstrated that mechanochemical leaching was effective; the extraction of copper increased significantly and continuously. Although the leaching efficiency of chalcopyrite was very low at ambient temperature, the percentages of copper dissolved in the presence of hydrogen peroxide（H2O2） and ferric sulfate（Fe2（SO4）3） after 20 h of mechanochemical leaching reached 28% and 33%, respectively. Given the efficiency of the developed method and the facts that it does not require the use of an autoclave and can be conducted at room temperature and atmospheric pressure, it represents an economical and easy-to-use method for the leaching industry.

关键词： chalcopyrite mechanical activation mechanochemical leaching sulfuric acid cyclic voltammetry

Techno-economic-environmental feasibility study of a photovoltaic system in northern part of Iran including a two-stage multi-string inverter with DC-DC ZETA converter and a modified P&O algorithm

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Clean Energy 2022年第1期6卷 127-140页

作者： sina Semeskandeh Mehrdad Hojjat Mohamad Hosseini Abardeh Department of Electrical and Computer Engineering Shahrood BranchIslamic Azad UniversityShahroodIran

Inverters play a significant role in the configuration of grid-connected photovoltaic(PV)*** perturb-and-observe(P&O)algorithm is a common method to derive the maximum power from grid-connected inverters;however,the possibility of losing maximum power due to sudden changes in radiation is a significant drawback of this control *** overcome this barrier,the two-stage multi-string inverter using the ZETA DC-DC converter and a novel P&O algorithm has been proposed to increase the efficiency of these *** proposed inverter has been simulated in MATLAB/SIMULINK *** investigate the performance of the proposed inverter,technical,environmental and economic feasibility studies have been performed for the construction of a 5-kW PV power plant in a northern city of Iran(Sari)using the RETScreen software developed by Natural Resources *** the other hand,most feasibility studies for power-plant construction are based on the concept of inverter peak efficiency,which leads to non-optimal system design due to the short operation duration of the inverter at this ***,the weighted European efficiency has been used in the feasibility study for more accurate ***,the performance of the proposed inverter is compared to that of a two-stage multi-string inverter using a conventional P&O algorithm and the single-stage(central)*** simulation results indicated that the proposed inverter injects 7.6 MW of power into the grid per ***,it prevents the emission of 88 tons of CO_(2)(over 20 years),which is equivalent to saving 1883.5 litres of gasoline per year.

关键词： photovoltaic environmental inverter grid-connected feasibility P&O algorithm

Discrete element method model calibration and validation for the spreading step of the powder bed fusion process to predict the quality of the layer surface

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Particuology 2024年第11期94卷 261-273页

作者： Marco Lupo sina Zinatlou Ajabshir Daniele Sofia Diego Barletta Massimo Poletto Department of Industrial Engineering University of SalernoVia Giovanni Paolo II13284084FiscianoSAItaly Granutools Rue Jean Lambert Defrene 1074340 AwansBelgium Dipartimento di Ingegneria Informatica ModellisticaElettronica e Sistemistica dell’Universita’della CalabriaVia Pietro Bucci87036 Rende CS(CS)Italy

A Discrete Element Method model,including interparticle cohesive forces,was calibrated and validated to develop a tool to predict the powder layer’s quality in the powder bed fusion *** elastic contact model was used to describe cohesive interparticle *** surface energy of the model particles was estimated by assuming that the pull-off force should provide the strength of the material evaluated at low consolidation with shear test *** particle rolling friction was calibrated considering the bulk density of the layer produced by the spreading *** model was validated with the experiments by comparing the wavelet power spectra obtained with the simulations with those of the experimental layers illuminated by grazing *** calibration proposed in this study demonstrated superior performance compared to our previous methods,which relied on measuring the angle of repose and unconfined yield strength.

关键词： Additive manufacturing Powder bed fusion Laser sintering Powder spreading Discrete element method Wavelet transform

Techno-economic-environmental comparison of floating photovoltaic plant with conventional solar photovoltaic plant in northern Iran

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Clean Energy 2022年第2期6卷 353-361页

作者： sina Semeskandeh Mehrdad Hojjat Mohamad Hosseini Abardeh Department of Electrical and Computer Engineering Shahrood BranchIslamic Azad UniversityShahroodIran

Photovoltaic(PV)systems can be used to generate electricity due to the potential for solar energy in *** floating photovol-taic(FPV)systems is a new approach to utilizing PV systems in *** of Iran’s energy consumption is supplied from fossil fuels,especially oil and *** recent years,Iran has faced environmental problems and air *** generation using fossil fuels has led to increased environmental ***,PV systems can be used to generate electricity due to the potential for solar energy in *** interest in predicting the energy production of PV power plants has increased in recent *** this regard,the techno-economic-environmental study of constructing PV power plants is a basic process to encourage people to use solar energy.A techno-economic-environmental feasibility study has been performed to construct a 5-kW FPV and ground PV(GPV)power plant in a northern city of ***,the FPV system is compared with the ground PV system using MATLAB^(■)Simulink and RETScreen^(■)*** this study,the effects of wind and water temperature have been ***,a sensitivity analysis was performed due to the uncertainty in climatic conditions and the amount of PV energy *** simulation results show that due to the cooling effect for panels in the FPV system,the production capacity and panels’efficiency are respectively 19.47%and 27.98%higher than the those of the GPV *** addition,the FPV system was found to have a 16.96%increase in the annual performance ***,using the FPV system reduces the equity payback to 6.3 years(a 22.2%reduction compared to the GPV power plant).

关键词： photovoltaic solar energy floating feasibility environmental

Thiopurines in inflammatory bowel disease revisited

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World Journal of Gastroenterology 2013年第11期19卷 1699-1706页

作者： Florian Br Christian sina Klaus Fellermann Medical Department 1 University Hospital Schleswig Holstein23538 LübeckGermany

Although a great variety of new drugs have been introduced for the therapy of inflammatory bowel diseases so far,a definite cure of the disease is still out of *** anti-inflammatory approach to induce remission followed by maintenance therapy with immunosupressants is still the mainstay of *** comprising azathioprine and its active metabolite mercaptopurine as well as tioguanine,are widely used in the therapy of chronic active inflammatory bowel disease(IBD).Their steroid sparing potential and efficacy in remission maintenance are out of ***,untoward adverse events are frequently observed and may preclude further administration or be life *** review will focus on new aspects of thiopurine therapy in IBD,its efficacy and safety.

关键词： Thiopurines Mercaptopurine Tioguanine Azathioprine Ulcerative colitis Crohn’s disease