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329篇 您的检索式:作者名="Qadir"
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1硅钾肥配施对水稻茎秆理化性状及抗倒伏能力的影响显示文摘该研究以易倒伏品种‘B优827’为试验材料,通过分析硅钾肥配合施用对水稻茎秆的弯曲力矩、抗折力以及倒伏指数的影响,探索通过肥料调控提高水稻抗倒伏能力的方法与技术措施。结果显示:(1)硅钾肥配施能显著增加水稻基部节间茎秆直径和壁厚,缩短节间长度,并在低硅中钾处理(T2,硅肥300kg/hm2、钾肥400kg/hm2)下基部各节间长度缩短幅度最大(12.44%~20.80%),直径和壁厚增加幅度分别为2.82%~5.76%、22.95%~28.57%。(2)硅钾肥配施处理后,水稻基部各节间纤维素、木质素及灰分含量显著变化,并以低硅中钾处理(T2)差异较显著,且基部节间木质素含量分别比对照显著提高14.55%、8.67%、7.73%。(3)硅钾肥配施处理能显著增加水稻基部节间抗折力,降低倒伏指数,同时仍以低硅中钾处理(T2)的抗折力最大、倒伏指数最小,对提高‘B优827’植株抗倒伏能力效果最好。研究表明,合理的硅钾肥配比(硅肥300kg/hm2、钾肥400kg/hm2)能显著增加易倒伏水稻品种‘B优827’的茎秆壁厚和直径,缩短基部节间长度,提高抗折力,同时还能增加其基部节间木质化程度,最终增强植株抗倒伏能力;硅钾肥配合施用可通过改善茎秆物理化学特性有效增强易倒伏水稻植株的抗倒伏能力。范永义 杨国涛 陈敬 蒋芬 MUSLIM Qadir 陈永军 胡运高 2017西北植物学报2017,37,4:25
2Extraction and characterization of alumina nanopowders from aluminum dross by acid dissolution process显示文摘A significant amount of aluminum dross is available as a waste in foundry industries in Bangladesh. In this study, alumina was extracted from aluminum dross collected from two foundry industries situated in Dhamrai and Manikgang, near the capital city, Dhaka. Aluminum dross samples were found to approximately contain 75wt% Al2O3 and 12wt% SiO2. An acid dissolution process was used to recover the alumina value from the dross. The effects of various parameters, e.g., temperature, acid concentration, and leaching time, on the extraction of alumina were studied to optimize the dissolution process. First, Al(OH)3 was produced in the form of a gel. Calcination of the Al(OH)3 gel at 1000°C, 1200°C, and 1400°C for 2 h produced θ-Al2O3,(α+θ)-Al2O3, and α-alumina powder, respectively. Thermal characterization of the Al(OH)3 gel was performed by thermogravimetric/differential thermal analysis(TG/DTA) and differential scanning calorimetry(DSC). The phases and crystallite size of the alumina were determined by X-ray diffraction analysis. The dimensions of the alumina were found to be on the nano level. The chemical compositions of the aluminum dross and alumina were determined by X-ray fluorescence(XRF) spectroscopy. The microstructure and morphology of the alumina were studied with scanning electron microscopy. The purity of the alumina extracted in this study was found to be 99.0%. Thus, it is expected that the obtained alumina powders can be potentially utilized as biomaterials.Saifur Rahman Sarker Zahangir Alam Rakibul Qadir M A Gafur Mohammad Moniruzzaman 2015International Journal of Minerals,Metallurgy and Materials2015,22,4:20
3MicroRNA-185通过靶向调节DN-MT1/PTEN/Akt通路抑制肝细胞癌的生长显示文摘近来研究表明miRNAs与肝癌的发生密切相关,然而单个miRNAs的具体作用机制仍未完全阐明。作者对microR-NA-185(miR-185)在肝细胞癌生物学功能和分子机制方面做了一些研究。实验发现,与非肿瘤性的肝脏实质相比, miR-185在人肝细胞癌组织中的表达减少;qRT-PCR检测显示,与原代肝细胞相比, miR-185在人肝细胞癌细胞中的表达下降;在体外人肝细胞癌细胞中miR-185的过表达会抑制细胞的增殖和侵袭,并且阻止SCID小鼠体内肿瘤的生长。miR-185的过表达能够抑制肝细胞癌细胞中DNMT13′端非翻译区域荧光素酶的活性,当 miR-185结合位点发生突变时,就不存在该效应;miR-185的复制或过表达会减少肝细胞癌细胞中DNMT1蛋白的表达。这些结果表明DNMT1是miR-185在肝细胞癌细胞中的靶向作用蛋白。 DNMT1在miR-185诱导抑制肝细胞癌的增殖中所起的作用,可进一步通过DNMT1的过表达阻止miR-185诱导抑制肝细胞癌细胞的增殖和侵袭这一事实所证实。 miR-185的复制或过表达能够减少PTEN启动子DNA甲基化并且提高PTEN的表达,从而抑制Akt磷酸化;如果DNMT1过表达,这些效应刚好相反。以上结果表明:miR-185靶向作用于DNMT1,通过诱导PTEN和抑制Akt,从而抑制肝细胞癌细胞的增殖,活化或激活miR-185可能成为肝细胞癌新的治疗策略之一。Qadir X V Han C Lu D 魏建国 许春伟 2014临床与实验病理学杂志2014,30,12:12
4Development of Magnesium-Dominant Soils Under Irrigated Agriculture in Southern Kazakhstan显示文摘Irrational irrigation practices in the Arys Turkestan Canal command area in the southern part of Kazakhstan have led to the formation of soils with poor physical and chemical properties. To study whether irrigation and leaching practices and/or groundwater rise have contributed to the accumulation of Mg2+ on the cation exchange complex of these soils, historical changes in soil and groundwater quality were used as source data and the Visual MINTEQ model was applied to analyze the chemical composition of water and soils in the study area. The imposed irrigation regime and the leaching of light sierosem soils led to the dissolution and subsequent leaching of inherent gypsum and organic matter from the soil profile. Further, the domination of bicarbonate in the irrigation water promoted weathering of the carbonate minerals present as calcite. The higher concentrations of Mg2+ in comparison to Ca2+ in the irrigation water resulted in the replacement of Na+ by Mg2+ on the cation exchange complex. In the lower part of the command area, shallow groundwater has contributed to the accumulation of Na+ and to a large extent of Mg2+ on the cation exchange sites.A. KARIMOV M. QADIR A. NOBLE F. VYSHPOLSKY K. ANZELM 2009Pedosphere2009,19,3:9
5基于病例研究冠状动脉扭曲对血流动力学的影响显示文摘目的探讨扭曲冠状动脉血流动力学的改变,从而阐明扭曲对冠状动脉血流灌注和壁面切应力(wall shear stress,WSS)的影响。方法选取冠状动脉左前降支(left anterior descending,LAD)扭曲和无扭曲两例个体病例,在Mimics软件中重建出LAD扭曲和无扭曲血管模型,并将模型导入ANSYS Fluent软件中进行血流动力学模拟计算,比较两种不同LAD模型的血流动力学情况。结果扭曲的冠状动脉在最大曲率大于1 mm^-1的弯曲处WSS下降较为明显,这种情况可能导致下游供血不足;弯曲外侧具有较低WSS(0~26 Pa),而弯曲内侧WSS相对较高(〉100 Pa);无扭曲和扭曲血管WSS均值分别为10.79、36.12 Pa,相比于无扭曲血管,扭曲血管整体WSS增高。结论扭曲冠状动脉整体WSS增高,从而可能延缓冠状动脉粥样硬化的进展。李洋 张叙 李志勇 ABDUL Qadir Nawabi 戴启明 童嘉毅 冯毅 沈成兴 刘乃丰 马根山 2018医用生物力学2018,33,3:8
6Disposal and Use of Sewage on Agricultural Lands in Pakistan: A Review显示文摘Raw sewage is widely used on agricultural soils in urban areas of developing countries to meet water shortages. Although it is a good source of plant nutrients, such sewage also increases the heavy metal load to soils, which may impact the food chain. Management options for sewage contaminated soils includes addition of nontoxic compounds such as lime, calcium sulfate and organic matter, which form insoluble metal complexes, thus reducing metal phytoavailability to plants. In this paper we review the variation in irrigation quality of sewage at different sites and its impact on the quality of soils and vegetables. Although quality of sewage was highly variable at source, yet the effluent from food industries was relatively safe for irrigation. In comparison effluent samples collected from textile, dyeing, calendaring, steel industry, hospitals and clinical laboratories, foundries and tanneries were hazardous with respect to soluble salts, sodium adsorption ratio and heavy metals like zinc, copper, iron, manganese, nickel, cobalt and cadmium. The sewage quality in main drains was better than that at the industry outlet, but was still not safe for irrigation. In general, higher accumulation of metals in fruits and vegetable roots was recorded compared to that in plant leaves. Edible parts of vegetables (fruits and/or leaves) accumulated metals more than the permissible limits despite the soils contained ammonium bicarbonate diethylenetriaminepentaacetic acid extractable metals within a safe range. In either case further scientific investigations are needed to ensure safe management strategies. Cadmium appeared to be the most threatening metal especially in leafy vegetables. It is advisable to avoid leafy vegetables cultivation in sewage irrigated areas everywhere to restrict its entry into food chain.G. MURTAZA A. GHAFOOR M. QADIR G. OWENS M. A. AZIZ M. H. ZIA SAIFULLAH 2010Pedosphere2010,20,1:6
7基于GIS与水动力模型的陶乐防洪保护区漫溢洪水风险分析显示文摘黄河青铜峡至石嘴山段洪涝灾害易发,分析黄河青石段防洪保护区的洪水风险,有助于完善黄河洪水防御体系,开展防汛应急工作和洪水风险管理。基于水动力学数值模拟理论,构建一维水动力洪水漫溢风险分析模型,以陶乐防洪保护区为研究对象,计算陶乐计算区100年一遇洪水的淹没水深及淹没范围,利用GIS技术生成保护区淹没水深图。研究成果表明,陶乐防洪保护区遭遇100年一遇洪水时,受灾较为严重的区域为芦苇、王家沟、小红柳滩、中滩村、下八顷村和黄泥岗等村庄,研究成果计算合理可靠,可为河道漫溢洪水精细化仿真与防汛部门防洪决策提供技术支撑。周跃华 岳志春 潘汀超 Rizwan Qadir 2020水力发电2020,46,10:5
8Isolation and characterization of xanthine oxidase inhibitory constituents of Pyrenacantha staudtii显示文摘Six compounds have been isolated from the leaves of Pyrenacantha staudtii, two of which are new compounds. The new compounds have been characterized as kaempherol 3-O-β-rhamnopyranosyl (1→6)-β-D-glucopyranoside (1) and 4-β-glucopyranosyl-(2-furyl)-5-methy-l,2-glucopyranoside phenylmethanone (2). The known compounds are 3-pyridinecarboxylic acid (3), β-sitosterol (4), sitosterol 3-O-β-glucopyranoside (5) and taraxerol (6). Their structures were determined by spectroscopic and chemical evidences. The two new compounds together with 3-pyridinecarboxylic acid showed significant in vitro xanthine oxidase inhibitory activity. To the best of our knowledge, this is the first report of these compounds from this plant.Abiodun FALODUN Muhammad Irfan QADIR Muhammad Iqbal CHOULDARY 2009药学学报2009,44,4:4
9Comparative Analysis of Ti,Ni,and Au Electrodes on Characteristics of TiO_2 Nanofibers for Humidity Sensor Application显示文摘The effect of metal(Ti,Ni,and Au) electrodes on humidity sensing properties of electrospun TiO_2 nanofibers was investigated in this work.The devices were fabricated by evaporating metal contacts on SiO_2 layer thermally grown on silicon substrate.The separation between the electrodes was 90μm for all sensors.The sensors were tested from 40%to 90%relative humidity(RH) by AC electrical characterization at room temperature. When sensors are switched between 40%and 90%RH,the corresponding response and recovery time are 3 s and 5 s for Ti-electrode sensor,4 s and 7 s for Ni-electrode sensor,and 7 s and 13 s for Au-electrode sensor.The hysteresis was 3%,5%and 15%for Ti-,Ni-,and Au-electrode sensor,respectively.The sensitivity of Ti,Ni,and Au-electrode sensors are 7.53 MΩ/%RH,5.29 MΩ/%RH and 4.01 MΩ/%RH respectively at 100 Hz.Therefore Ti-electrode sensor is found to have linear response,fast response and recovery time and higher sensitivity as compared with those of Ni- and Au-electrode sensors.Comparison of humidity sensing properties of sensors with different electrode material may propose a compelling route for designing and optimizing humidity sensors.S.S.Batool Z.Imran M.Israr Qadir M.Usman H.Jamil M.A Rafiq M.M.Hassan M.Willander 2013Journal of Materials Science & Technology2013,29,5:3
10Crop and irrigation management strategies for saline-sodic soils and waters aimed at environmentally sustainable agriculture显示文摘M Qadir J.D Oster 2003Science of the Total Environment2003,,1:1
11A review of eosinophilic gastroenteri- tis显示文摘Baig MA Qadir A Rasheed J 2006J Natl Med Assoc2006,98,10:1
12黄河卫宁段河南溃堤洪水风险及沟渠倒灌影响显示文摘黄河卫宁段河南溃堤洪水灾害风险较大,引排水沟渠倒灌危害较为严重,威胁沿岸交通、通信、水利工程等基础设施以及人民群众生命财产安全,为加强洪灾预防与应对措施建设,基于一、二维水动力学数值模拟方法及沟渠倒灌影响评估方法,采用非结构化网格与内边界处理技术合理优化了复杂边界与线状地物阻挡水效果,建立了考虑排水沟渠倒灌影响的溃堤风险分析精细化仿真模型,并将其应用于黄河卫宁段河南保护区溃堤洪水演进模拟,并评估了引排水沟渠倒灌影响。结果表明:所建模型能较精确地模拟卫宁段河南保护区遭遇100 a一遇洪水堤防溃决造成的淹没风险,当卫宁段河南保护区遭遇100 a一遇洪水在泉眼山处溃堤时,跃进渠、七星渠和张裕沟将不发生倒灌退水现象,南河子沟将发生倒灌退水现象,南河子沟倒灌长度为3910 m。岳志春 周跃华 曹鲁赣 RIZWAN Qadir 2021人民黄河2021,43,4:1
13Digital text watermarking: secure content delivery and data hiding in digital documents显示文摘Qadir M A Ahmad I 2006Aerospace and Electronic Systems Magazine IEEE2006,21,11:1
14Crop and irrigation management strate- gies for saline-sodic soils and waters aimed at environmen- tally sustainable agriculture显示文摘Qadir M Oster J D 2004Science of the Total Envi- ronment2004,323,13:1
15Amelioration Strategies for Saline Soils显示文摘Qadir M Ghafoor A and Murtaza G 2000Land Degradation and Development2000,11,:1
16Agricultural water management in water-starved countries: Challenges and opportunities 显示文摘Qadir M Boers Th M Schubert S 2003Agricultural Water Management2003,62,:1
17Productivity enhancement of salt-affected environments through crop diversification显示文摘Qadir M Tubeileh A Akhtar J 2008Land Degradation and Development2008,19,:1
18Fecal incontinence and constipation in children:A clinical conundrum显示文摘Ali SR Ahmed S Qadir M 2011Oman Med J2011,26,5:1
19A review of eosinophilic gastroenteritis 显示文摘Baig MA Qadir A Rasheed J 2006J Natl Med Assoc2006,98,10:1
20Photophysical characterization of triazole-substituted coumarin fluorophores显示文摘Jessie A. Key Sherni Koh Qadir K. Timerghazin Alex Brown Christopher W. Cairo 2009Dyes and Pigments2009,,2:1
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