检索结果-南通市图书馆

Can Social Media be Used to Control Academic Stress?An Application of the Theory of Planned Behavior

在线全文

学校读者我要写书评

暂无评论

International Journal of Mental Health Promotion 2022年第1期24卷 25-38页

作者： Maliheh Shadi Nooshin peyman Ali Taghipour Alireza Jafari Hadi Tehrani Department of Health Education&Health Promotion School of HealthStudent Research CommitteeMashhad University of Medical SciencesMashhad13131-99137Iran Health Education&Health Promotion Social Determinants of Health Research CenterMashhad University of Medical SciencesMashhad13131-99137Iran Epidemiology Social Determinants of Health Research CenterMashhad University of Medical SciencesMashhad13131-99137Iran Social Determinants of Health Research Center Gonabad University of Medical SciencesGonabadIran

The present study was conducted aiming at investigating the effect of social media-based intervention according to the Theory of Planned Behavior(TPB)to control the academic stress of the *** study comes in two descriptive and quasi-experimental sections in the Academic Year *** order to determine the effect of planned behavioral constructs on stress levels,the descriptive study was conducted on 320 *** quasiexperimental study was organized to determine the effect of a social media-based educational intervention on the TPB on 180 *** collection was conducted through questionnaires of personal information,Gadzella’s Student-Life Stress Inventory,and researcher-made questionnaire based on the TPB,with a confirmed validity and *** predicted 15.1%of the variance of academic stress among students and the perceived behavioral control construct had the most significant effect(p<0.001).The mean score of knowledge and subject norms in the experimental group was significantly increased during the study(p<0.05).The social media intervention could reduce the students’academic stress to some extent and lead to the student’s subject norms development.

关键词： Academic stress social media students

A RESULT OF SUZUKI TYPE IN PARTIAL G-METRIC SPACES

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2014年第2期34卷 274-284页

作者： peyman SALIMI Pasquale VETRO Young Researchers and Elite Club Rasht BranchIslamic Azad University Università degli Studi di Palermo Dipartimento di Matematica e Informatica

Recently, Suzuki [T. Suzuki characterizes metric completeness, Proc. A generalized Banach contractlon principle that Amer. Math. Soc. 136 （2008）, 1861-1869] proved a fixed point theorem that is a generalization of the Banach contraction principle and char- acterizes the metric completeness. Paesano and Vetro [D. Paesano and P. Vetro, Suzuki＇s type characterizations of completeness for partial metric spaces and fixed points for partially ordered metric spaces, Topology Appl., 159 （2012）, 911-920] proved an analogous fixed point result for a self-mapping on a partial metric space that characterizes the partial metric O- completeness. In this article, we introduce the notion of partial G-metric spaces and prove a result of Suzuki type in the setting of partial G-metric spaces. We deduce also a result of common fixed point.

关键词： Fixed and common fixed points Suzuki fixed point theorem partial G-metricspaces

Empirical Investigation of Major Variables for Purification of Industrial Waste Water

在线全文

学校读者我要写书评

暂无评论

Advances in Nanoparticles 2023年第3期12卷 81-93页

作者： peyman Haghighi Farshad Farahbod Department of Chemical Engineering Marvdasht Branch Islamic Azad University Marvdasht Iran Department of Chemical Engineering Firoozabad Branch Islamic Azad University Firoozabad Iran

The total petroleum hydrocarbon (TPH), polycyclic aromatics (PCA), nonvolatile suspended solids and volatile suspended solids besides other important parameters, total hardness, calcium hardness, CO2 content, total dissolved solids, electrical conductivity, sedimentation time, chemical oxygen demands, biochemical oxygen demands, pH value after sedimentation and pH after coagulation in aerobic treatment are surveyed due to the changes in fast mixing rate. The experimental results show the TPH removal percentage and PCA removal percentage increases from 53.5% to 62.8% and 43.8% to 46.3% with increasing of nano dosage from 1 gr to 2.5 gr, respectively.

关键词： Wastewater TPH PCA Temperature Fast Mixing Oxygen pH Hardness

A Facile Method for Dye and Heavy Metal Elimination by p H Sensitive Acid Activated Montmorillonite/Polyethersulfone Nanocomposite Membrane

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2018年第1期36卷 49-57页

作者： Mehdi Mahmoudian peyman Gozali Balkanloo Ehsan Nozad Nanotechnology Research Institute Urmia University

Modified clay/polyethersulfone（PES） mixed matrix membranes（MMMs） were prepared by acid activated montmorillonite（AA-MMT） with different concentrations and used to eliminate dyes and remove heavy metals from aqueous solution. The morphology and physiochemical properties of prepared clay nanoparticles and MMMs were characterized using X-ray diffraction（XRD）, Fourier transform infrared（FTIR） spectroscopy, scanning electron microscopy（SEM）, enegy dispersive X-ray（EDX） spectroscopy, Brunauer-Emmett-Teller（BET） analysis, atomic force microscopy（AFM）, contact angle measurement and fouling studies. The filtration study showed that removal of dyes and heavy metals was strongly dependent on p H so that dyes with positive and negative charges showed different separation efficiency in acidic and alkaline conditions. The modified membranes possessed better heavy metal removal in acidic and alkaline p Hs. When the rejection of heavy metals was measured in an alkaline environment, it was observed that the rejection had a great increase compared to the neutral values for Zn^（2＋） and Ni^（2＋） ions, while rejection of Cu^（2＋） and Cd^（2＋） did not undergo significant changes. So it can be concluded that modified membranes show good selectivity for elimination of Zn^（2＋） and Ni^（2＋） ions with respect to other cations.

关键词： Nanocomposite membranes Acid activated montmorillonite Heavy metal/dye elimination

Shape factor for regular and irregular matrix blocks in fractured porous media

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2020年第1期17卷 136-152页

作者： peyman Rostami Mohammad Sharifi Morteza Dejam Department of Petroleum Engineering Amirkabir University of Technology(Polytechnic of Tehran)Hafez AvenueP.O.Box 15875-4413TehranIran Department of Petroleum Engineering College of Engineering and Applied ScienceUniversity of Wyoming1000 E.University AvenueLaramieWY 82071-2000USA

Describing matrix–fracture interaction is one of the most important factors for modeling natural fractured reservoirs.A common approach for simulation of naturally fractured reservoirs is dual-porosity modeling where the degree of communication between the low-permeability medium(matrix)and high-permeability medium(fracture)is usually determined by a transfer *** of the proposed matrix–fracture functions depend on the geometry of the matrix and fractures that are lumped to a factor called shape ***,there is no unique solution for calculating the shape factor even for symmetric *** fine-scale modeling is a tool for calculating the shape factor and validating the current solutions in the *** this study,the shape factor is calculated based on the numerical simulation of fine-grid simulations for single-phase flow using finite element *** the best of the author’s knowledge,this is the first study to calculate the shape factors for multidimensional irregular bodies in a systematic *** models were used,and shape factors were calculated for both transient and pseudo-steady-state(PSS)cases,although in some cases they were not clarified and assumptions were not *** boundary condition dependency of the shape factor was also investigated,and the obtained results were compared with the results of other *** show that some of the most popular formulas cannot capture the exact physics of matrix–fracture *** obtained results also show that both PSS and transient approaches for describing matrix–fracture transfer lead to constant shape factors that are not unique and depend on the fracture pressure(boundary condition)and how it changes with time.

关键词： Fractured reservoirs Shape factor Matrix–fracture boundary conditions Computational fluid dynamic(CFD)

A Machine Learning Approach for Collusion Detection in Electricity Markets Based on Nash Equilibrium Theory

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2021年第1期9卷 170-180页

作者： peyman Razmi Majid Oloomi Buygi Mohammad Esmalifalak the Department of Electrical Engineering Ferdowsi University of MashhadMashhadIran the Predictive Modeling Department of Fiix Software TorontoCanada

We aim to provide a tool for independent system operators to detect the collusion and identify the colluding firms by using day-ahead data. In this paper, an approach based on supervised machine learning is presented for collusion detection in electricity markets. The possible scenarios of the collusion among generation firms are firstly identified. Then,for each scenario and possible load demand, market equilibrium is computed. Market equilibrium points under different collusions and their peripheral points are used to train the collusion detection machine using supervised learning approaches such as classification and regression tree(CART) and support vector machine(SVM) algorithms. By applying the proposed approach to a four-firm and ten-generator test system, the accuracy of the proposed approach is evaluated and the efficiency of SVM and CART algorithms in collusion detection are compared with other supervised learning and statistical techniques.

关键词： Market power collusion detection machine learning support vector machine(SVM) classification and regression tree(CART) statistical method

Active Control of A Piston-Type Absorbing Wavemaker with Fully Reflective Structure

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2020年第5期34卷 730-737页

作者： Saeed MAHJOURI Rasoul SHABANI Ghader REZAZADEH peyman BADIEI Department of Mechanical Engineering Faculty of EngineeringUrmia UniversityUrmiaIran South Ural state University ChelyabinskRussian Federation cDepartment of Civil Engineering Tehran UniversityTehranIran

Multiple reflections of the waves between structure and wavemaker in hydraulic flumes could change the frequency content of the desired incident wave or result in resonance. A prominent approach to avoid multiple reflections is active control of the wavemaker. This paper proposes a simple and practical active control algorithm for piston-type wavemaker. The block diagram of the control system is presented in real time domain. It is shown that there is no need to use any transfer function or filter in the feedback and feed forward loops and the use of constant gains can yield acceptable results. In the operating frequency range(0.25-2 Hz), it is revealed that the proposed system is very effective at suppressing the excitation of resonant sloshing for regular wave. In the case of irregular waves, it is depicted that the experimental waves agree quite well with the desired wave elevation in frequency domain. In addition, comparison of the results obtained both with and without absorption discloses the good characteristics in time domain.

关键词： wave flume piston-type wavemaker active absorption mathematical modeling reflective waves

Performance enhancement of cantilever piezoelectric energy harvesters by sizing analysis

在线全文

学校读者我要写书评

暂无评论

International Journal of Smart and Nano Materials 2020年第2期11卷 93-116页

作者： peyman Hajheidari Ion Stiharu Rama Bhat Department of Mechanical Industrial and Aerospace Engineering(MIAE)University of ConcordiaMontrealQuébecCanada

This paper presents the results of the performance of piezoelectric cantilever beams in relation to their *** total produced power represents the main indicator of performance of a piezoelectric harvesting system while the area of the beams stays *** design is an important aspect in any industry,mainly in the *** this study,the effects of non-uniformity on the efficiency and power output are *** element method(FEM)with the application of superconvergent element(SCE)is adopted here to solve the *** is observed that the trapezoidal geometry(converging beam)provides a higher output power while the efficiency ***,in order to prove that the power enhancement is achievable while the amount of piezoelectric material consumed is constant the new configuration is *** the configuration,an array of uniform beams connected in series is used instead of one single rectangular *** proposed setting generates an output power of 1.817mWat a resonant frequency of 284.6 Hz when excited by an input acceleration of 1 *** only challenge is the fundamental frequency difference which ismet with the application of proof mass and thinner substrate and piezoelectric layers.

关键词： Piezoelectric energy harvester superconvergent element tapered beam performance enhancement sizing

Practical seismic resilience evaluation and crisis management planning through GIS-based vulnerability assessment of buildings

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2021年第1期20卷 25-37页

作者： peyman Narjabadifam Ramin Hoseinpour Mohammad Noori Wael Altabey Department of Civil Engineering Faculty of EngineeringUniversity of Bonab***BonabIran Department of Mechanical Engineering California Polytechnic State UniversitySan Luis ObispoCA 93405USA International Institute for Urban Systems Engineering(IIUSE) Southeast UniversityNanjing 210096China Department of Mechanical Engineering Faculty of EngineeringAlexandria UniversityAlexandria21544Egypt

The objective of this paper is to demonstrate how assessment of seismic vulnerability can be effective in protection against *** are reported from a case study in a densely populated urban area near an active fault,utilizing practical methods and exact engineering *** factors were determined due to technical considerations,and a field campaign was performed to collect the required ***-criteria decision making was carried out by means of an analytical hierarchy process including a fuzzy *** scenarios were applied through an implicit vulnerability *** was utilized and the results were analyzed by classifying the state of vulnerability in levels as very low,low,moderate,high,and very *** resilience was evaluated as vulnerabilities below the moderate state,being about 40% in an intensity of 6 Mercalli and less than 10% in 10 *** is concluded that seismic resilience in the area studied is not acceptable,the area is vulnerable in the expected scenarios,and due to the high seismicity of the region,proper crisis management planning is required in parallel with attempts toward *** this regard,an emergency map was developed with reference to the assessed vulnerabilities.

关键词： seismic resilience crisis management vulnerability assessment earthquake retrofit AHP Expert Choice GIS