维普中文期刊产品整合服务
310篇 您的检索式:作者名="Farman"
    题名 作者 年代 出处 被引量
1基于离散元法的旋耕过程土壤运动行为分析显示文摘土壤与耕作部件间的相互作用规律是设计和选用土壤耕作部件的基础。研究土壤和耕作部件间的相互作用规律就是要研究耕作部件对土壤产生的作用和它们之间的作用力,首先必须探讨耕作部件工作时土壤运动规律和施加于土壤的作用力。为此本文建立基于离散元方法的旋耕工作模型;对比分析实验与仿真的土壤位移:在土槽实验中采用示踪块方法测量土壤位移,仿真中通过追踪表层土壤颗粒的运动获得仿真位移;利用实验和仿真数据对土壤位移和运动机理进行分析。结果表明:土壤水平和侧向位移都随着转速增加呈现增加的趋势;土壤的水平运动位移总是大于同转速下的侧向位移。浅层土壤颗粒的运动位移最大,中层土壤次之,深层土壤最小。较深位置的土壤,距离旋转中心越近的土壤颗粒水平位移和侧向位移越大。在旋耕刀切土范围内的土壤,有向相反方向运动趋势的浅、中、深层颗粒比例分别为26.2%、72.1%、48.4%。在水平力作用下,大部分土壤颗粒随着旋耕刀切土有向后运动的行为;土壤在开始时刻的侧向受力和侧向运动方向,由颗粒的侧向位置是否偏离侧切刃轴线决定,位于侧切刃轴线左侧的颗粒,则其侧向力向左,反之亦然;土壤在垂直方向先随着刀具入土向下运动,然后滑出刀刃边界被抛起。本文建立的仿真模型得到的土壤水平位移和侧向位移与相应实验值的误差为24.9%和15.3%。本文运用离散元法进行旋耕过程中土壤宏观和细观运动行为的分析,有助于理解旋耕刀与土壤的相互作用机理,为旋耕机械的设计与优化提供理论依据。方会敏 姬长英 Farman Ali Chandio 郭俊 张庆怡 Chaudhry Arslan 2016农业机械学报2016,47,3:110
2CBCT的基本原理及在口腔各科的应用进展显示文摘目的锥形束CT(cone beam computer tomography,CBCT)应用于口腔科进行三维立体成像,具有广泛的临床应用前景。本文主要综述CBCT成像的基本原理,以及在口腔种植科、正畸科、颌面外科和内科等口腔临床科室应用的最新进展。鞠昊 朱红华 段涛 李志民 孙宏晨 Farman AG Scarfe WC 2015医学影像学杂志2015,25,5:37
3不同药剂拌种对小麦根腐病和孢囊线虫病的防效显示文摘在田间条件下研究了150 g·L^(-1)苯醚·阿维·吡等10种药剂拌种对小麦根腐病和孢囊线虫病的防治效果。结果表明:30 g·L^(-1)苯醚甲环唑和60 g·L^(-1)戊唑醇拌种处理对小麦根腐病防治效果分别为73.9%和66.2%,但二者对小麦孢囊线虫无防治效果; 50 g·L^(-1)阿维菌素和140 g·L^(-1)阿维·吡拌种处理后,土壤中校正孢囊减退率分别为58.4%和69.2%;使用600 g·L^(-1)吡虫啉拌种对孢囊线虫未见明显防治效果,但吡虫啉能对阿维菌素的杀线作用有一定增效作用;复配剂150 g·L^(-1)苯醚·阿维·吡和160 g·L^(-1)戊·阿维·吡对小麦根腐病和小麦孢囊线虫病防治效果较好,二者对小麦根腐病防治效果分别为75.6%和63.8%,校正孢囊减退率分别为71.3%和74.1%;从增产效果来看,150 g·L^(-1)苯醚·阿维·吡拌种后小麦增产效果最好,平均产量为7 869.9 kg·hm^(-2),增产率为8.6%。综合药剂安全性、防病效果和增产效果,150 g·L^(-1)苯醚·阿维·吡适合在生产上防治小麦根腐病和孢囊线虫病。迟元凯 赵伟 汪涛 陈晴晴 Farman Ali 戚仁德 2018植物病理学报2018,48,5:9
4Measurement of total phenolic content and antioxidant activity of aerial parts of medicinal plant Coronopus didymus显示文摘Objective: To evaluate the total phenolic content and compare the antioxidant activity of various solvent extracts and fractions from the aerial parts of Coronopus didymus through various assays. Methods: Total phenolic content was determined using the Folin-Ciocalteu assay and the in vitro antioxidant activity of a number of different extracts was investigated in a dose-dependent manner with three different methods: the 2,2-diphenyl-1-picrylhydrazyl(DPPH), 2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt(ABTS) and ferric reducing antioxidant power(FRAP) assays. A flavone was isolated from the most active ethanolic extract with high antioxidant activity using size exclusion chromatography. IC_(50) values were calculated for the DPPH and ABTS methods. The FRAP activity was assessed in terms of μM Fe(II) equivalent. Results: The phenolic content was found to be highest in the ethanol extract(CDA Et; 47.8 mM GAE) and the lowest in the dichloromethane extract(CDA DCM; 3.13 mM GAE). The ethanol extract showed high radical scavenging activity towards DPPH and ABTS radicals with IC_(50) values of(7.80 × 10~2) and(4.32 × 10~2) μg/m L, respectively. The most active ethanol extract had a FRAP value of 1 921.7 μM Fe(Ⅱ) equivalent. The isolated flavone F10C(5,7,4'-trihydroxy-3'-methoxy flavone) was far more effective for scavenging free radicals in the DPPH and ABTS assays with IC_(50) of 43.8 and 0.08 μg/m L, than the standard trolox, with IC_(50) values of 97.5 and 21.1 μg/m L, respectively. In addition, the flavone F10C and the standard ascorbic acid had FRAP values of 1 621.7 and 16 038.0 μM Fe(Ⅱ) equivalents, respectively. Conclusions: The total phenolic content of extracts in decreasing order is ethanol extract(CDA Et)> acetone extract(CDA ACE)> phenolic extract(CDA MW)> n-hexane extract(CDA nHX)> chloroform extract(CDA CHL)> dichloromethane extract(CDA DCM). The ordering of extracts in terms of antioxidant activity from highest to lowest is CDA Et> CDA MW> CDA DCM> CDA CHL> CDA ACE> CDA nHX in DPPH, ABTS and FRAP assays. A significant relationship is found between antioxidant potential and total phenolic content, suggesting that phenolic compounds are the major contributors to the antioxidant activity of Coronopus didymus.Hafiza Noreen Nabil Semmar Muhammad Farman James S.O.McCullagh 2017Asian Pacific Journal of Tropical Medicine2017,10,8:9
5小麦茎秆力学性能的国内外研究显示文摘小麦是我国主要粮食经济作物。本文对其茎秆的拉伸、剪切、弯曲、压缩等力学性能的研究进展进行了简要回顾,对现有研究存在的不足进行了简要分析。国内外的相关研究均忽略了小麦茎秆上鞘的存在对小麦茎秆力学性能的影响,鲜有文献分析小麦茎秆的力学性质与机具的相互作用。将小麦茎秆力学性能与现有的仿真分析技术结合,将有利于小麦茎秆力学性能的发挥及农业机械的设计与优化。方会敏 姬长英 张庆怡 Farman Ali Chandio 2014中国农机化学报2014,35,6:6
641.7%氟吡菌酰胺悬浮剂对栝楼根结线虫病的防治效果显示文摘[目的]探究41.7%氟吡菌酰胺悬浮剂防治栝楼根结线虫病的使用方法和使用剂量。[方法]采集、鉴定并室内繁殖安徽省潜山市供试田中栝楼根结线虫;在室内接种试验和大田试验条件下,评价41.7%氟吡菌酰胺悬浮剂对栝楼根结线虫病的防治效果。[结果]安徽省潜山市供试田块栝楼根结线虫病病原为南方根结线虫(Meloidogyne incognita);分别在栝楼出苗后第10和70天,使用41.7%氟吡菌酰胺悬浮剂80~100μL/株,对水1000 mL后灌根,田间栝楼根部病情指数分别降低79.3%和91.4%。[结论]41.7%氟吡菌酰胺悬浮剂灌根可以有效防治栝楼根结线虫病。迟元凯 汪涛 赵伟 叶梦迪 Farman Ali 戚仁德 2019安徽农业科学2019,47,23:5
7丹参膜上倾斜移栽机构设计与试验显示文摘针对丹参膜上倾斜移栽人工作业效率和质量较低、劳动强度较大、现有移栽机不适合丹参膜上倾斜移栽等问题,结合丹参大垄双行覆膜高效生产技术提出的膜上倾斜移栽农艺要求,设计一种基于变形椭圆齿轮-双变速曲柄五杆机构的鸭嘴式丹参膜上倾斜移栽机构。在移栽机构所要求的运动轨迹、栽植器倾斜姿态和设计要求的基础上,分析机构的工作原理并建立机构理论模型。依据数学模型运用Matlab开发出移栽机构人机交互可视化辅助程序,应用该辅助程序研究机构参数对栽植器倾斜角和栽植器端点轨迹的影响规律,通过人机交互的方式得到符合丹参膜上倾斜移栽机构农艺要求的参数组合。根据优化后的参数组合设计样机并进行虚拟仿真和样机田间试验,试验结果表明:变形椭圆齿轮-双变速曲柄五杆式丹参膜上倾斜移栽机构在满足丹参膜上倾斜移栽要求的同时能保证作业质量,移栽机构的立苗角度合格率为90. 7%、漏栽率为2. 7%、株距变异系数为5. 6%、栽植深度合格率为93. 7%。徐高伟 刘宏新 FARMAN A C 方会敏 荐世春 何腾飞 2019农业机械学报2019,50,2:4
8Mechanical strength of wheat grain varieties influenced by moisture content and loading rate显示文摘Mechanical shear resistance of wheat grain is a significant concern for the designers and researchers related to the design of threshing,handling and processing machinery of the field crops.The grain mechanical properties directly affect the machine geometry and its operational parameters.The present study was carried out to determine the shear resistance of five wheat varieties(Locally names;TD-02,Sindhu-1105,Benazir,China and SKD-118)influenced by moisture content(16.7%,18.7%and 19.5%)and loading rate(3 mm/s,6 mm/s and 9 mm/s).However,some physio-dimensional properties(length,width,thickness,slenderness ratio,surface area and sphericity)were obtained at different moisture contents.The results showed that the shear resistance reduced by increasing the moisture content and loading rate.The average shear resistance decreased from 10.45 N to 3.74 N for 3-9 mm/s loading rate at moisture content of 16.7%to 19.5%.Thus,the maximum correlation(r=0.905)of shear resistance obtained at 16.7%,whereas minimum correlation(r=0.692)obtained at 19.5%.The shear resistance of wheat grain was highly significant(p<0.05)at 9 mm/s for 19.5%.Shear resistance decreased with an increase in the moisture content in the grain whereas deformation is increasing with the increase of moisture content.However,the maximum bulk density of wheat grain obtained at 19.5%for SKD-118,while the minimum obtained at 16.7%for TD-02.It is recommended that the design and modification of wheat grain processing equipment should be executed on the physio-mechanical properties of grain varieties.Yaoming Li Farman Ali Chandio Zheng Ma Imran Ali Lakhiar Abdul Razaque Sahito Fiaz Ahmad Irshad Ali Mari Umer Farooq Muhammad Suleman 2018International Journal of Agricultural and Biological Engineering2018,11,4:4
9Productive performance, egg quality, hematological parameters and serum chemistry of laying hens fed diets supplemented with certain fat-soluble vitamins, individually or combined, during summer season显示文摘This present study aimed to determine the efficacy of supplementing layer diets with vitamin A(0, 8,000 and16,000 IU/kg diet) and vitamin E(0, 250 and 500 mg/kg diet) either individually or in combination on egg production and quality, and blood hematology and chemistry of birds reared under summer conditions. A total of 135 Bovans Brown laying hens were distributed to 9 treatment groups with 5 replicates of 3 hens/pen in a 3 × 3 factorial design. A significant improvement in feed conversion ratio(FCR) was observed as supplementary vitamin A or E increased(P 0.01). Hens fed diets supplemented with 16,000 IU vitamin A plus 500 mg vitamin E/kg diet had the best FCR among all groups. Egg quality traits were not significantly affected by the interaction of vitamin A and vitamin E levels. There was a significant increase in monocytes(P ≤ 0.01)and a decrease in basophils counts(P ≤ 0.05) in response to vitamin E. Significant decreases were observed in packed cell volume(PCV), thyroxine(T_4), alanine transferase(ALT), albumin, total cholesterol and total lipids((P ≤ 0.05 or P ≤ 0.01) P 0.01), and increases were observed in serum concentrations of globulin(P ≤ 0.05)and calcium(P ≤ 0.01) due to vitamin A. The combination of 0 IU vitamin A and 500 mg vitamin E/kg diet had the highest values of PCV(40.09%) and hemoglobin(Hb)(10.33 mg/100 mL) among all groups. Vitamin E raised serum values of total protein, total cholesterol and total lipids(P ≤ 0.05 or P≤ 0.01). Feed intake, FCR,PCV, Hb, lymphocytes, monocytes, eosinophils, T_4, ALT and total protein were significantly affected by the interaction of vitamins A and E(P ≤ 0.05 or P ≤ 0.01). The interaction of vitamins A and E was only significant with respect to serum total protein(P ≤ 0.05). It can be concluded that layer diets supplemented with vitamins A and E had good results in alleviating the harmful impacts of high ambient temperature. The combination of 16,000 IU vitamin A and 500 mg vitamin E per kilogram diet is preferable for obtaining better production of laying hens reared under hot summer conditions.Mohamed E.Abd El-Hack Mahmoud Alagawany Khalid M.Mahrose Muhammad Arif Muhammad Saeed Muhammad A.Arain Rab N.Soomro Farman A.Siyal Sarfraz A.Fazlani Justin Fowler 2019Animal Nutrition2019,,1:3
10Effects of different irrigation frequencies and incorporation of rice straw on yield and water productivity of wheat crop显示文摘The current rapid increase in irrigation water consumption is considered unsustainable and threatens the world food production.Therefore,it is mandatory to promote modern techniques and to manage existing conventional irrigation methods.The present study was attempted to determine the effects of different irrigation frequencies and rice straw incorporation rates on yield and water productivity of the wheat crop.The experiment was arranged with randomize complete block design involving nine treatments(RS 0 I 7,RS 0 I 15,RS 0 I 22,RS 1 I 7,RS 1 I 15,RS 1 I 22,RS 2 I 7,RS 2 I 15 and RS 2 I 22)under three replications.Results exposed that the incorporation of rice straw with different irrigation frequencies significantly improved physico-chemical properties of soil.Moreover,soil bulk density,infiltration rate,pH,electrical conductivity significantly decreased and soil porosity significantly increased under all treatments.Furthermore,maximum crop yield and crop water productivity of 7706.4 kg/hm 2 and 1.92 kg/m 3 respectively were found under RS 1 I 15 treatment.Based on experimental results it can be concluded that irrigation frequency and incorporation of rice straw had significant effects on the physico-chemical properties of soil,total grain yield and water productivity of the wheat crop.However,this study suggested that the wheat crop yield and water productivity could be increased by incorporating 1 t/hm 2 rice straw with 15 d of irrigation frequency.Mazhar Hussain Tunio Jianmin Gao Mashooque Ali Talpur Imran Ali Lakhiar Farman Ali Chandio Sher Ali Shaikh Kashif Ali Solangi 2020International Journal of Agricultural and Biological Engineering2020,13,1:2
11A Comparison of Maxillofacial CBCT and Medical CT显示文摘Christos Angelopoulos William C. Scarfe Allan G. Farman 2012Atlas of the Oral & Maxillofacial Surgery Clinics of North A2012,,1:2
12植保无人飞机作业参数对田外除草靶标区内外雾滴沉积规律的影响显示文摘雾滴大小、气象条件和施药装备的作业参数对雾滴的覆盖范围、靶标的吸附性能有影响。无人飞机(UAV)是目前有助于高效喷雾的现代施药技术装备。然而作业参数对靶标区和脱靶区的影响依然尚待确定。开展了田间试验并运用沉积扫描软件测定了在田外除草中不同飞行高度(2 m和3 m)和飞行速度(2 m/s和3 m/s)下雾滴的沉积量、覆盖密度、覆盖率和雾滴直径。结果表明,当无人飞机在处理T_(1)中以2 m/s速度、2 m高度飞行时,靶标区域平均沉积量最高,为2.29μL/cm^(2),飞行航线中央0点位置的覆盖率达到36.19%。处理T_(1)、T_(2)、T_(3)和T_(4)在飞行航线中央的雾滴谱相对宽度分别为0.70、1.01、1.03、1.05。处理T_(1)体积中值直径(VMD,也即D_(v0.5))最大,为448.75μm;而处理T_(4)的D_(v0.5)最小,为238.95μm。单旋翼无人飞机在脱靶区的沉积量几乎可以忽略不计。本研究为无人飞机运营商、农民和生产企业提供了参考,从而优化航空植保技术在除草上的应用。Fiaz Ahmad 邱白晶 董晓娅 马靖 黄鑫 Shibbir Ahmed Farman Ali Chandio 蔡晨(译) 2021中国农机化学报2021,42,8:2
13The dysregulated autophagy signaling is partially responsible fordefective podocyte development in wt1a mutant zebrafish显示文摘Podocytes are essential elements of the glomerular filtration barrier and relevant to many kidney diseases.But the molecular mechanism in podocyte development is still unclear.Wilms tumor protein(WT1)is an essential factor for urogenital system development.Zebrafish have two wt1 genes,naming wt1a and wt1b.Here,we examined the roles of both wt1 genes in zebrafish embryonic development employing the CRISPR/Cas9 technology.The homozygous wt1a mutants displayed developmental malformations including pericardial edema,yolk sac edema and failure of glomerulus development.Loss of wt1a function disrupted podocyte differentiation and inhibited expression of podocin and nephrin.In contrast,the homozygous wt1b mutants were phenotypically normal and had no severe phenotypes of nephrogenesis defects that were observed in wt1b morpholino knockdown embryos.Therefore,wt1a plays an essential role in kidney development,whereas wt1b might not be essential for kidney development.Interestingly,from previous studies we knew that autophagy is involved in podocyte differentiation.By detecting the protein level of P62 and LC3A/B,we found the autophagy signal was greatly reduced in wt1a mutants.To better understand the relationship between autophagy signal and wt1a function in podocyte development,rapamycin was added to activate autophagy in wt1a-mutated embryos.As a result,podocyte injury was ameliorated in wt1a homozygous mutants by rapamycin treatment.In conclusion,our findings not only confirmed the essential function of wt1a during kidney development,but also provided a possible way for treatment of diseases involving podocyte injury.Xuemei Zhang Qiaohong Lin Fan Ren Jin Zhang Farman Ullah Dawar Jie Mei 2018Aquaculture and Fisheries2018,3,3:2
14Pediatric dental patients' attitudes to rubber dam显示文摘McKay A Farman M Rodd H 2013J Clin Pediatr Dent2013,38,2:1
15Epidemiological Analysis of the Coronavirus Disease Outbreak with Random Effects显示文摘Today,coronavirus appears as a serious challenge to the whole world.Epidemiological data of coronavirus is collected through media and web sources for the purpose of analysis.New data on COVID-19 are available daily,yet information about the biological aspects of SARS-CoV-2 and epidemiological characteristics of COVID-19 remains limited,and uncertainty remains around nearly all its parameters’values.This research provides the scientic and public health communities better resources,knowledge,and tools to improve their ability to control the infectious diseases.Using the publicly available data on the ongoing pandemic,the present study investigates the incubation period and other time intervals that govern the epidemiological dynamics of the COVID-19 infections.Formulation of the testing hypotheses for different countries with a 95%level of condence,and descriptive statistics have been calculated to analyze in which region will COVID-19 fall according to the tested hypothesized mean of different countries.The results will be helpful in decision making as well as in further mathematical analysis and control strategy.Statistical tools are used to investigate this pandemic,which will be useful for further research.The testing of the hypothesis is done for the differences in various effects including standard errors.Changes in states’variables are observed over time.The rapid outbreak of coronavirus can be stopped by reducing its transmission.Susceptible should maintain safe distance and follow precautionary measures regarding COVID-19 transmission.Muhammad Farman Aqeel Ahmad Ali Akgül Muhammad Umer Saleem Muhammad Naeem Dumitru Baleanu 2021Computers, Materials & Continua2021,,6:1
16Genome organization of Magnaporthe grisea: integration of genetic maps, clustering of transposable elements and identification of genome duplications and rearrangments显示文摘Nitta N Farman M L Leong S A 1997Theor Appl Genet1997,95,:1
17Trends in maxillofa-cial cone-beam computed tomography usage显示文摘Arnheiter C Scarfe WC Farman AG 0,,02:1
18Anesthesia for hepatic transplantation: cardiovascular and metabolic alterations and their management显示文摘Carmichael FS Lindop MJ Farman JV 1985Anesth Analg1985,64,:1
19Variations in the normal anatomy of the inferior dental (mandibular)canal: a retrospective study of panoramic radiographs from 3612 rou- tine dental patients显示文摘Nortje C J Farman A G Grotepass F W 1977Br J Oral Maxillofac Surg1977,15,1:1
20Genome organization of Magnaporthe grisea:genetic map,electrophoretic karyotype,and occurrence of repeated DNAs显示文摘Skinner D Z Budde A D Farman M L 1993Theor Appl Genet1993,,87:1
返回顶部 每页显示:
共16页 首页 上一页 第1页 下一页 末页 /16 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费