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298篇 您的检索式:作者名="Daneshvar"
    题名 作者 年代 出处 被引量
1Independent component analysis approach for fault diagnosis of condenser system in thermal power plant显示文摘A statistical signal processing technique was proposed and verified as independent component analysis(ICA) for fault detection and diagnosis of industrial systems without exact and detailed model.Actually,the aim is to utilize system as a black box.The system studied is condenser system of one of MAPNA's power plants.At first,principal component analysis(PCA) approach was applied to reduce the dimensionality of the real acquired data set and to identify the essential and useful ones.Then,the fault sources were diagnosed by ICA technique.The results show that ICA approach is valid and effective for faults detection and diagnosis even in noisy states,and it can distinguish main factors of abnormality among many diverse parts of a power plant's condenser system.This selectivity problem is left unsolved in many plants,because the main factors often become unnoticed by fault expansion through other parts of the plants.Ajami Ali Daneshvar Mahdi 2014Journal of Central South University2014,21,1:6
2以金属硫酸氢盐为催化剂在无溶剂条件下高效合成3,4-二氢嘧啶-2(1H)-酮显示文摘以金属硫酸氢盐M(HSO4)n(Ca(HSO4)2,Zn(HSO4)2和过硫酸氢钾制剂oxone○R)为催化剂催化醛、1,3-二羰基化合物和尿素进行缩合反应,在90℃及无溶剂的条件下高收率、一锅法合成了3,4-二氢嘧啶-2(1H)-酮.Khodabakhsh NIKNAM Mohammad Ali ZOLFIGOL Zahra HOSSIENINEJAD Nader DANESHVAR 2007催化学报2007,28,7:3
3MRI and PET images fusion based on human retina model显示文摘The diagnostic potential of brain positron emission tomography (PET) imaging is limited by low spatial resolution. For solving this problem we propose a technique for the fusion of PET and MRI images. This fusion is a trade-off between the spectral information extracted from PET images and the spatial information extracted from high spatial resolution MRI. The proposed method can control this trade-off. To achieve this goal, it is necessary to build a multiscale fusion model, based on the retinal cell photoreceptors model. This paper introduces general prospects of this model, and its application in multispectral medical image fusion. Results showed that the proposed method preserves more spectral features with less spatial distortion. Comparing with hue-intensity-saturation (HIS), discrete wavelet transform (DWT), wavelet-based sharpening and wavelet-à trous transform methods, the best spectral and spatial quality is only achieved simultaneously with the proposed feature-based data fusion method. This method does not require resampling images, which is an advantage over the other methods, and can perform in any aspect ratio between the pixels of MRI and PET images.DANESHVAR Sabalan GHASSEMIAN Hassan 2007Journal of Zhejiang University-Science A(Applied Physics & Engineering)2007,8,10:2
4Pre-sowing treatment for breaking dormancy in Acer velutinum Boiss. seed lots显示文摘Acer velutinum Boiss is a valuable tree species native to Iran, and its seeds possess physiological dormancy that hampers seedling production in the nursery for large-scale reforestation efforts. The aim of this study was to determine the optimal dormancy breaking treatments for A. velutinum seeds. We conducted a factorial experiment involving six seed lots collected along an elevation gradient from 300 to 1800 m at 300 m interval and four cold-moist stratification periods (0, 4, 8 and 16 weeks) at 4℃ and 70% relative humidity. The result shows that the germination of cold-moist stratified seeds was significantly (p < 0.0001) higher than the control for all seed lots. The highest germination capacity was recorded after 16 weeks of cold-moist stratification for all seed lots (68% 88% depending on the seed lot) except those collected from mid altitude sites (600 and 900 m) that germinated equally well (≥ 75%) after 4and 8-week of clod-moist stratification compared to the other seed lots. The mean germination time was significantly shorter (12 to 19 days, depending on the seed lot) for seeds stratified for 16 weeks than for untreated seeds. It can be concluded that: (1) cold-moist stratification for 16 weeks is the best pre-sowing treatment for breaking dormancy in A. velutinum seeds; and (2) seeds should be collected from mid altitude sites (600 and 900 m) to get more than 80% germination within 15 days, and these seed lots even required shorter cold-moist stratification period(eight weeks) than other seed lots.Mostafa Farhadi Mulualem Tigabu Alireza Ghasemi Arian Mehdi Sharifani Abolfazl Daneshvar Per Christer Oden 2013Journal of Forestry Research2013,24,2:2
5Physico-chemical characteristics and heavy metal concentrations of copper mine wastes in Zambia:implications for pollution risk and restoration显示文摘Soil characterization is a vital activity to develop appropriate and effective restoration protocols for mine wastelands while insights into the total content of heavy metals in the soil is an important step in estimating the hazards that the metals may pose to the vital roles of soil in the ecosystem.This study addressed the following research questions:(1)To what extent do the physico-chemical characteristics vary between mine waste sediments and the nearby forest soil?(2)Are the concentrations of heavy metals high enough to be considered as toxic?and(3)Are heavy metals present in mine waste sediments potential sources of pollution?We hypothesized that the physicochemical characteristics of mine waste sediments are less favorably for plant establishment and growth while the concentrations of heavy metals are very high,thus restricting the success of revegetation of mine waste lands.Mine waste sediments were sampled following a diagonal transect across tailings dams,overburden dump sites and the local forest soil from the top layer(0-20 cm)using a closed auger.Samples were analyzed for arsenic,barium,lead,cadmium,cobalt,copper,chromium,nickel,vanadium,and zinc as well as for soil physico-chemical properties.The mine waste sediments were dominated by silt whilst the forest soil by sand particles,with significantly high bulk density in the former.Both the forest soil and overburden sediments were acidic than the alkaline tailings dam sediment.Total organic carbon and nitrogen contents were significantly low in mine wasteland substrates but the concentration of Ca and Mg were significantly higher in tailings dam substrate than the forest soil.The concentrations of available P,K and Na were similar across sites.The mean concentrations of heavy metals were significantly(p<0.01)higher in mine waste sediments than the forest soil;except for cadmium(p=0.213).The order of contamination by heavy metals on the tailings was Cu>Co>Ba>Ni>As>Zn>Pb>Cr>V>Cd,and that on the overburdens was Cu>Co>Ba>Ni>Zn>Cr>Pb>V>As>Cd.The pollution load index(PLI)was nearly twice higher for the tailings dam(8.97)than the overburden(5.84).The findings show that the copper mine wastes(the tailings dams and overburden waste rock sites)are highly contaminated by heavy metals;which,in turn,might pose serious hazards to human health and agricultural productivity.In addition,poor macro-nutrient availability,substrate compaction and soil acidity(particularly on overburden sites)coupled with toxic level of heavy metals would be the main challenges for successful phytostabilization of copper mine wastelands.Mutale N.Chileshe Stephen Syampungani Emma Sandell Festin Mulualem Tigabu Abolfazl Daneshvar Per Christer Odén 2020Journal of Forestry Research2020,31,4:2
6Effectiveness of seatbelts in mitigating traumatic brain injury severity显示文摘INTRODUCTION Over the past few decades,traumatic brain injuries(TBIs)have become one of the leading causes of death and the leading cause of injury-related death in the USA.[1,2]It is estimated that 1.70 million people are subject to TBIs each year.[2]Males are more likely to sustain TBIs(59%);the most common age groups are 0–5 years,15–19 years,and>65 years.[2]Approximately 1.36 million people present to the emergency department(ED),275,000 are admitted to the hospital,and 52,000 people die from TBIs.[2]The leading causes of TBIs are falling(35.2%),motor vehicle collisions(MVCs,17.3%),struck by/against an object(16.5%),and assault(10.0%).[2]These statistics combine to make TBIs the leading cause of injury-related death in the USA at 30.5%.[2]It has been estimated that,with specifi c guidelines from the Brain Trauma Foundation,up to 50.0%of the 52,000 TBIrelated deaths may be prevented.[3]Latha Ganti Aakash NBodhit Yasamin Daneshvar Kelsey Hatchitt Sudeep Kuchibhotla Christa Pulvino Sarah WAyala Keith RPeters 2021World Journal of Emergency Medicine2021,12,1:2
7显示文摘Kang K Daneshvar K Tsu R 2004Microelectron J2004,35,8:1
8显示文摘Kang K Daneshvar K 2004J Appl Phys2004,95,:1
9Kinetic modeling of photocatalytic degradation of acid red 27 in UV/TiO2 process显示文摘Daneshvar N Rabbani M Modirshahla N 2004J Photochem Photobio A:Chem2004,168,1:1
10Photocatalyticdegradation of the herbicide erioglaucine in the presence ofnanosized titanium dioxide : Comparision and modeling ofreaction kinetics 显示文摘Daneshvar N Salari D Niaei A 2006Journal of Environmental Science andHealth Part b-Pesticides Food Contaminants andAgricultural Wastes2006,41,8:1
11Flotation techniques to improve viability of Juniperus polycarpos seed lots显示文摘The germination of freshly collected Juniperus polycarpos(K. Koch) seeds is very low and attributed to the large proportion of nonviable seeds in the seed lots.Thus, the aim of this study was to improve seed lot quality by removing nonviable seeds using two flotation techniques: incubation-drying-separation(IDS) and modified specific gravity(MSG) separation. We examined different IDS conditions(the specific incubation time, subsequent drying time and sorting media) for effectively sorting out nonviable seeds; and tested the feasibility of modified SG separation, which involved soaking seeds in water for a certain period before sorting in different concentrations of sucrose solution. Viable seeds were expected to absorb and metabolically bind more water during soaking than dead seeds could, and hence be sorted effectively depending on the viscosity of the sucrose solution. The viability of the seeds that floated or sank was determined in a topographical tetrazolium chloride(TTC) test. For the IDS trial,7 days incubation followed by 9 h of drying and sedimentation in pure water or 200 g L-1sucrose solution identified, respectively, 75 and 82 % of the seeds as viable(sunken) seeds. For the MSG trail, 77 % viable seeds were recovered in the sunken fraction when seeds were soaked for 48 h then immediately sorted in 600 g L-1sucrose solution. In both cases, the loss of viable seeds in the discarded floating fraction was only 4 %. The results demonstrate that both IDS and MSG separation techniques substantially improved seed lot viability, but MSG separation is simple and needs no modern seed handling facility, and its efficacy relies on seed mass(due to the initial soaking) and the specific density and viscosity of the flotation medium.Abolfazl Daneshvar Mulualem Tigabu Asaddollah Karimidoost Per Christer Odén 2017Journal of Forestry Research2017,28,2:1
12Chromium adsorption and Cr( Ⅵ ) reduction to trivalent chromium in aqueous solutions by soya cake 显示文摘Daneshvar N Salari D Aber S 2002Journal of Hazardous Materials2002,94,1:1
13Survival of colorectal cancer patients in the presence of competing-risk显示文摘Baghestani AR Daneshvar T Pourhoseingholi MA Asian Pac J Cancer Prev0,15,15:1
14Decreased expression of toll like receptor signaling molecules in chronic HBV infected patients显示文摘Momeni M Zainodini N Bidaki R Hassanshahi G Daneshvar H Khaleghinia M Ebrahim M KarimiGoogheri M Askari A Arababadi M K Kennedy D 2014Hum Immunol2014,75,1:1
15Motion control of omni-directional three-wheel robots by brain-emotional-learning- based Intelligent controller 显示文摘SHARBAFI M A LUCAS C DANESHVAR R 2010IEEE Transactions on Systems Man and cybernetics2010,40,6:1
16Photocatalytic degradation of aze dye acid red 14 in water on ZnO as an alternative catalyst to TiO2显示文摘Daneshvar N Salari D Khataee A R 2004J Phtochem Photobiol A2004,162,23:1
17The effects of ulnar styloid fractures on patients sustaining distal radius fi-actures 显示文摘Daneshvar P Chan R MacDermid J 2014Journal of hand surgery2014,39,10:1
18HLA-DQB1 subtypes predict dia-betic retinopathy in patients with type I diabetes meUitus 显示文摘Khazaee MH Tavakol Afshari J Khazaee B Daneshvar R Ak- barzadeh J Khazaee L 2009Eur J Ophthalmol2009,19,4:1
19On the stress dis- tribution around the hole in mechanically fastened joints显示文摘Yavari V Raiahi I Daneshvar F 2009Mechanics Research Communications2009,36,3:1
20Decolorization of dye solution containing Acid Red 14 by electrocoagulation with a comparative investigation of different electrode connections显示文摘DANESHVAR N SORKHABI H A KASIRI M B 2004J Hazard Materi2004,112,:1
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