检索结果-南通市图书馆

Proportional integral derivative controller design using Legendre orthogonal functions

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2016年第10期23卷 2616-2629页

作者： Reza Moradi mohammad tabatabaei Department of Electrical Engineering Khomeinishahr Branch Islamic Azad University

The Legendre orthogonal functions are employed to design the family of PID controllers for a variety of plants. In the proposed method, the PID controller and the plant model are represented with their corresponding Legendre series. Matching the first three terms of the Legendre series of the loop gain with the desired one gives the PID controller parameters. The closed loop system stability conditions in terms of the Legendre basis function pole(λ) for a wide range of systems including the first order, second order, double integrator, first order plus dead time, and first order unstable plants are obtained. For first order and double integrator plants, the closed loop system stability is preserved for all values of λ and for the other plants, an appropriate range in terms of λ is obtained. The optimum value of λ to attain a minimum integral square error performance index in the presence of the control signal constraints is achieved. The numerical simulations demonstrate the benefits of the Legendre based PID controller.

关键词： PID controllers orthogonal functions legendre functions moment matching PI controller PD controller

Preconcentration of Lead in Sugar Samples by Solid Phase Extraction and Its Determination by Flame Atomic Absorption Spectrometry

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

American Journal of Analytical Chemistry 2011年第5期2卷 626-631页

作者： Saied Saeed Hosseiny Davarani Neda Sheijooni-Fumani Amin Morteza Najarian mohammad-Ali tabatabaei Siavash Vahidi 不详

A simple and sensitive solid phase extraction utilizing C18 filled cartridges incorporated with dithizone for preconcentration of lead and its subsequent determination by flame atomic absorption spectrometry (FAAS) was developed. Several parameters such as type, concentration and volume of eluent, pH of the sample solution, flow rate of extraction and volume of the sample were evaluated. The effect of a variety of ions on preconcentration and recovery was also investigated. At pH = 7.4 and 1.0 mol?L–1 HCl eluting them, lead ions were recovered quantitatively. The limit of detection (LOD) defined as 3Sbl was determined to be 8.1 μg L–1 for 500 mL of sample solution and eluted with 5 mL of 1.0 mol?L–1 HCl under optimum conditions. The accuracy and precision (RSD %) of the method were >90% and <10%, respectively. In the end, the proposed method was applied to a number of real sugar samples and the amount of lead was determined by spiking a known concentration of lead into the solution.

关键词： Solid Phase Extraction Lead Dithizone Flame Atomic Absorption Spectroscopy (FAAS) C18 Modified Cartridges

Comparison of the predictive value of the Helsinki,Rotterdam,and Stockholm CT scores in predicting 6-month outcomes in patients with blunt traumatic brain injuries

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 Traumatology 2023年第6期26卷 357-362页

作者： Nushin Moussavi Biuki Hamid Reza Talari mohammad Hossein tabatabaei Masoumeh Abedzadeh-Kalahroudi Hossein Akbari Mahsa Masjedi Esfahani Reihaneh Faghihi Department of Surgery Trauma Research CenterKashan University of Medical SciencesKashanIran Department of Radiology Kashan University of Medical SciencesKashanIran Trauma Research Center Kashan University of Medical SciencesKashanIran Department of Biostatistics Trauma Research CenterKashan University of Medical SciencesKashanIran

Purpose:Despite advances in modern medicine,traumatic brain injuries(TBIs)are still a major medical *** diagnosis of TBI is crucial for clinical decision-making and *** study aims to compare the predictive value of Helsinki,Rotterdam,and Stockholm CT scores in predicting the 6-month outcomes in blunt TBI ***:This cohort study was conducted on blunt TBI patients of 15 years or *** of them were admitted to the surgical emergency department of Shahid Beheshti Hospital in Kashan,Iran from 2020 to 2021 and had abnormal trauma-related findings on brain CT *** patients’demographic data such as age,gender,history of comorbid conditions,mechanism of trauma,Glasgow coma scale,CT images,length of hospital stay,and surgical procedures were *** Helsinki,Rotterdam,and Stockholm CT scores were simultaneously determined according to the existing *** included patients'6-month outcome was determined using the Glasgow outcome scale extended.M Data were analyzed by SPSS software version ***,specificity,negative/positive predictive value and the area under the receiver operating characteristic curve were calculated for each *** Kappa agreement coefficient and Kuder Richardson-20 were used to compare the scoring ***:Altogether 171 TBI patients met the inclusion and exclusion criteria,with the mean age of(44.9±20.2)*** patients were male(80.7%),had traffic related injuries(83.1%)and mild TBIs(64.3%).Patients with lower Glasgow coma scale had higher Helsinki,Rotterdam,and Stockholm CT scores and lower Glasgow outcome scale extended *** all the scoring systems,the Helsinki and Stockholm scores showed the highest agreement in predicting patients’outcomes(kappa=0.657,p<0.001).The Rotterdam scoring system had the highest sensitivity(90.1%)in predicting death of TBI patients,whereas the Helsinki scoring system had the highest sensitivity(89.8%)in predicting the 6-month outcome in TBI

关键词： Brain injuries,traumatic Traumatic Rotterdam CT scoring system Helsinki CT scoring system Stockholm CT scoring system CT scan Glasgow outcome scale extended

Complications of intrastromal bevacizumab injection in lamellar keratoplasty

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2020年第2期13卷 356-358页

作者： mohammad Soleimani Ahad Shahbazi Nader mohammadi Seyed Ali tabatabaei Ocular Trauma and Emergency Department Eye Research CenterFarabi Eye HospitalTehran University of Medical SciencesTehran ***Iran

Dear Editor,We would like to report complications of intrastromal bevacizumab injection for corneal neovascularization(CNV)after lamellar keratoplasty(LK)in two *** is a significant risk factor for graft *** leads to graft failure by disturbing the immune function of the cornea after penetrating keratoplasty(PKP).Studies reported that more than fifty percent of graft failure occurs in this condition[1].

关键词： bevacizumab Complications lamellar keratoplasty

A survey of incidental ocular trauma by pencil and pen

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2018年第10期11卷 1668-1673页

作者： Seyed Ali tabatabaei mohammad Soleimani Morteza Naderan Aliasghar Ahmadraji mohammad Bagher Rajabi Hajar Jafari Mona Safizade Department of Ophthalmology Eye Research Center Farabi Eye Hospital Tehran University of Medical Sciences

AIM：To determine characteristic features of ocular trauma resulted from self-trauma by writing instruments among pediatric ***：Thirty-six children who suffered from selfinflicted ocular trauma with a writing instrument were included in this prospective cross-sectional ***：The mean age was 5.6±2.7y with male：female ratio of *** right eye was involved two times more than the left *** superomedial（55.5%）and inferomedial（30.6%）quadrants were the most common sites of *** leading culprit was colored pencils（44.4%）.During surgical exploration,no foreign body（FB）was found in 25（69.4%）patients while an FB was found in 11（30.5%）*** injury was present in two patients（5.6%）and only in superomedial quadrant *** 1 was the most common site for ocular trauma associated with penetrating *** mean ocular trauma score（OTS）in penetrating injuries was 3.8±*** best corrected visual acuity（BCVA）was 0.3±0.6 upon admittance and 0.08±0.21 after one *** final BCVA was significantly correlated with the entrance site,better final BCVA was found in nasal entrance site（P〈0.05）.CONCLUSION：The ophthalmologists should keep a high index of suspicion to rule out penetrating eye injuries related to writing instruments in a young uncooperative *** injury is a life-threatening event that should be ruled out by appropriate *** canthal area as the most common site needs an especial attention in writing instrument injuries.

关键词： pencil pediatric children trauma ocular

An attempt to find a suitable place for soil moisture sensor in a drip irrigation system

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Information Processing in Agriculture 2022年第2期9卷 254-265页

作者： Zahra Amiri Mahdi Gheysari mohammad Reza Mosaddeghi Samia Amiri Mahsa Sadat tabatabaei Water Engineering Department College of AgricultureIsfahan University of TechnologyIsfahan84156-83111Iran Environmental Sciences Department University of California-RiversideCA92521USA Department of Soil Science College of AgricultureIsfahan University of TechnologyIsfahan84156-83111Iran Department of Civil and Environmental Engineering Colorado State UniversityFort CollinsColorado 80523USA

Determination of an appropriate location for monitoring soil water content (SWC) is a keyfactor in efficient use of water in precision agriculture, however, the main challenge is thedynamic movement of water and root development in the soil profile. The objective of thisstudy was investigating how SWC distribution in a loam soil profile at two growth stages ofmaize may impact the suitable location for SWC monitoring in a drip-tape irrigation system.A new concept, Average Moisture Representative Surface (AMRS) was proposed to determine the surface of the soil profile, which represent the average soil moisture of the wettedvolume. SWC samples were taken during two irrigation intervals (48~52 days after planting(DAP) and 68~73 DAP) and root growth pattern was studied through root length density (RLD)at 50 and 100 DAP. The results revealed that a non-uniform wetting pattern after irrigationlimits the appropriate locations for SWC monitoring to point measurements and with time,SWC depletion resulted in enlarging AMRS. At the end of growing season, an increase of rootgrowth around the drippers increased the variation of root water uptake in different soil layers, and thus optimal place for soil sensors was limited to the upper layers, where the maximum root water uptake occurred. Overall, it is recommended to install soil sensors, such astensiometers and TDRs at a horizontal distance of 5~20 cm from the crop and a depth of10~20 cm from the soil surface while drip-tape is aligned close to the maize row.

关键词： Drip-tape irrigation Maize Precision agriculture Root development Soil water content distribution

Open globe injuries in geriatric population in Iran: characteristics and outcomes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2021年第8期14卷 1237-1240页

作者： Maryam Zamani Seyed Ali tabatabaei Akbar Fotouhi Morteza Naderan mohammad Soleimani Ocular Trauma and Emergency Department Eye Research CenterFarabi Eye HospitalTehran University of Medical SciencesTehran ***Iran Department of Epidemiology and Biostatistics School of Public HealthTehran University of Medical SciencesTehran ***Iran

AIM:To investigate the patterns and outcomes of open globe injuries in the elderly population in ***:In this retrospective cross-sectional chart review,medical records of 248 patients(aged 60 y and more)with the diagnosis of open globe injury from 2006 to 2016 were *** features,type,and mechanism of open globe injury,ocular trauma score(OTS),visual acuity before and after treatment,the zone of injuries,and the associated injuries found at the presentation or thereafter were ***:A total of 248 eyes of 248 patients were *** mean age was 69.2±5.8 y(range:60-90 y).Male/female ratio was about 3:1(187 vs 61).The three most common causes of injury were falling(25.2%),sharp objects(18.9%),and tree branches(13.9%).Penetrating injury accounted for most of the geriatric ocular trauma(50.4%),followed by globe rupture(40.3%),intraocular foreign body(IOFB;7.3%),and perforating injury(2.0%).The median raw OTS for the population was 60.5 and the most common OTS class was *** injuries tend to affect zoneⅠmore than zoneⅡand zoneⅢ.The only predictor of final visual acuity was the class of OTS(P<0.001).CONCLUSION:Geriatric open globe injury should be valued *** most common type of open globe injury in Iran is penetrating injuries but falling remain the main *** OTS class must be considered as an important predictor of final visual acuity.

关键词： geriatric ocular trauma ocular trauma score open globe injury

Urrets-Zavalia syndrome in different methods of keratoplasty

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2016年第9期9卷 1358-1360页

作者： Alireza Foroutan Seyed Ali tabatabaei mohammad Soleimani Shahbaz Nekoozadeh Eye Research Center Rassoul Akram HospitalIran University of Medical Sciences Ocular Trauma and Emergency Department Farabi Eye HospitalTehran University of Medical Sciences

INTRODUCTIONUrrets-Zavalia was first described as a syndrome consisting of a fixed,dilated pupil with iris atrophy following penetrating keratoplasty（PKP）in 1963 and back then it was thought that this syndrome was only related to keratoconus *** findings that were not essential for the diagnosis were posterior synechiae,ectropion uvea,pigment dispersion,anterior subcapsular lens opacities and secondary glaucoma syndrome.

关键词： PKP Urrets-Zavalia syndrome in different methods of keratoplasty TASS

Epidemiological aspects of ocular superglue injuries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2016年第2期9卷 278-281页

作者： Seyed Ali tabatabaei Shokoufeh Modanloo Arezoo mohammadkhani Ghiyasvand Abolghasem Pouryani mohammad Soleimani Seyed Mehdi tabatabaei Ahmad Reza Pakrah Hamideh Masarat Eye Research Center Farabi Eye Hospital Tehran University of Medical Sciences

AIM： To report the frequency, associated risk factors and characteristics of cases referred to Farabi Eye Hospital with ocular superglue injuries. METHODS： In a descriptive cross-sectional study conducted between December 2012 and February 2013, patients with ocular superglue injuries were evaluated. Age, sex, educational level, location, time, mechanism, type, site and time of eye injury were gathered through interview using a customized questionnaire. All participants had given consent to undergo thorough eye examination. RESULTS： Over the course of three months, 105 patients with ocular superglue injuries enrolled in the study, including 56 （53.3%） men and 49 （46.7%） women with the mean age of 24.7±11.6 （range, 2 to 53）y. The right eye, left eye and both eyes were involved in 52%, 42% and 6% of the patients, respectively. Most of injuries had occurred at home （72.4%） and at night （55%）. More than half of patients （52.4%） did not take any primary aids following the ocular injury. Patient carelessness （78.1%）, childhood curiosity and lack of parental supervision （11.4%）, storing superglue in inappropriate places and inadvertently using superglue as eye drops due to poor vision （2.9%）, inadequate awareness of superglue applications [used to stick on artificial nails （3.8%）, artificial eyelashes （1.9%） and broken tooth （1%）] and being assaulted with glue （1%） were common risk factors. CONCLUSION： The frequency of ocular superglue injuries in patients referred to Farabi Eye Hospital is relatively high. This finding underlines the importance of public education and awareness about superglue injuries to the eye and taking protective measures and safety strategies in order to prevent these injures.

关键词： eye injuries superglue risk factors