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Particle size dependent sinterability and magnetic properties of recycled HDDR Nd-Fe-B powders consolidated with spark plasma sintering

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Journal of Rare Earths 2020年第1期38卷 90-99页

作者： Awais Ikram farhan mehmood Richard Stuart Sheridan muhammad Awais Allan Walton Anas Eldosouky Saso Sturm Spomenka Kobe Kristina Zuzek Rozman Department for Nanostructured materials Jozef Stefan InstituteJamova 39SI-1000 LjubljanaSlovenia Jozef Stefan International Postgraduate School Jamova 39SI-1000 LjubljanaSlovenia School of metallurgy and materials University of BirminghamEdgbastonBirminghamB152TTUnited Kingdom magneti Ljubljana d.d.Stegne 37SI-1000 LjubljanaSlovenia

The dependence of the magnetic properties on the particle size of recycled HDDR Nd-Fe-B powders was investigated,with the aim to assess the reprocessing potential of the end-of-life scrap magnets via spark plasma sintering(SPS).The as received recycled HDDR powder has coercivity(Hci)=830 kA/m and particles in the range from 30 to 700 μm(average 220 μm).After burr milling,the average particle size is reduced to 120 μm and subsequently the Hci of fine(milled) powder was 595 kA/*** plasma sintering was exploited to consolidate the nanograined HDDR powders and limit the abnormal grain *** optimal SPS-ing of coarse HDDR powder at 750℃for 1 min produces fully dense magnets with Hci=950±100 kA/m which further increases to 1200 kA/m via thermal treatment at 750℃for 15 *** burr milled fine HDDR powder under similar SPS conditions and after thermal treatment results in Hci=940 kA/*** fine powder is further sieved down from 630 to less than 50 μm mesh size,to evaluate the possible reduction in Hci in relation to the particle *** gain in oxygen content doubles for m sized particles as compared with coarser fractions(>200 μm).The XRD analysis for fractionated powder indicates an increase in Nd2O3 phase peaks in the finer(m)***,the Hci reduces from 820 kA/m in the coarse particles(>200 μm) to 460 kA/m in the fine sized particles(m).SPS was done on each HDDR powder fraction under the optimal conditions to measure the variation in Hci and *** Hci of SPS-ed coarse fraction(>200 μm) is higher than 930 kA/m and it falls abruptly to just 70 kA/m for the fine sized particles(m).The thermal treatment further improves the Hci to>1000 kA/m only up to 100 μm sized fractions with>90% sintered *** full densification(>99%) is observed only in the coarse *** loss of coercivity and lack of sinterability in the fine sized particles(m) are attributed to a very high oxygen *** implies that durin

关键词： Reprocessing end-of life scrap Rare earth permanent magnets HDDR Nd2Fe14B Recycling Spark plasma sintering

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Aqueous ruthenium detection by microwave-assisted laser-induced breakdown spectroscopy

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Plasma Science and Technology 2022年第8期24卷 32-39页

作者： Abu farhan ABU KASIm m A WAKIL Kevin GRANT milton HEARN Zeyad T ALWAHABI School of Chemical Engineering The University of AdelaideAdelaide SA 5005Australia

Aqueous ruthenium was detected in real-time under ambient conditions using microwaveassisted laser-induced breakdown spectroscopy(mW-LIBS).A 10 mJ laser energy and 750 W microwave power were directed at an open liquid jet sample of *** was observed that,for liquid flow,the coupling efficiency between the microwave and the laser-induced plasma was limited to 43%.The improvement in the ruthenium’s signal-to-noise ratio with mW-LIBS,with respect to LIBS,was *** on mW-LIBS,the limit of detection for aqueous ruthenium was determined to be 957±84 ppb.

关键词： microwave-assisted laser induced breakdown spectroscopy ruthenium detection laser induced breakdown spectroscopy

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Numerical Analysis on Thermal Performance of Cool Asphalt Pavement

Numerical Analysis on Thermal Performance of Cool Asphalt Pa...

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作者：法和（farhan Sarwar）东南大学

学位级别：硕士

Cool asphalt pavement is the pavement with reduced surface temperature by employing using a reflective coating,thermal resistance materials,water-permeable/remaining materials or other *** materials,materials that can change their color variable in response to temperature,reflect solar energy at high temperatures and accept that at low *** of these factors can reduce surface temperature of a paved *** this study,cool asphalt pavement is designed by incorporating thermochromic materials into asphalt *** performance of cool asphalt pavement is investigated with numerical simulation and field *** using COmSOL software,a threedimensional element model was proposed to mimic the thermal characteristics of an asphalt pavement based on measured climate data in muzaffarabad,*** measurements showed that higher temperatures of asphalt concrete could be reduced to 4.7 °C in may and increased to 1.3 °C in February,respectively compared to conventional asphalt *** corresponding temperature gradient across the mound can be reduced to 16.5 K/m and 13.7 K/m *** concrete results have the advantage of reducing operational damage associated with high temperatures of the paved road,in order to improve the durability and safety of the asphalt pavement,and to reduce the thermal effects of urban *** practical studies were used with the aim of investigating the effect of materials on changing the temperature of the asphalt paved surface,and thereby proving its suitability for improving its *** total,standard asphalt concrete and asphalt concrete containing black,blue and red materials were studied respectively,from April to June,2021,for 24 *** investigate the thermal performance of thermochromic asphalt concrete,higher temperatures were measured and analyzed in *** has been shown that temperatures higher than thermochromic asphalt concrete may be 5.8 °C,6.1 °C and 3

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密度和纤维取向对炭/炭复合材料烧蚀性能的影响(英文)

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新型炭材料 2010年第3期25卷 161-167页

作者： Shameel farhan 李克智郭领军高全明兰逢涛西北工业大学材料学院陕西西安710072 晋西工业集团有限责任公司质量检验中心山西太原030027

采用不同的预制体和致密化方法制备了密度不同的5种炭/炭复合材料(密度范围1.77g/cm3～1.85g/cm3)。用氧-乙炔焰对试样进行了烧蚀试验,并用SEm表征了烧蚀后材料的形貌。结果表明:烧蚀后,与乙炔焰成30o角的纤维变成楔形,而与火焰平行的... 详细信息

采用不同的预制体和致密化方法制备了密度不同的5种炭/炭复合材料(密度范围1.77g/cm3～1.85g/cm3)。用氧-乙炔焰对试样进行了烧蚀试验,并用SEm表征了烧蚀后材料的形貌。结果表明:烧蚀后,与乙炔焰成30o角的纤维变成楔形,而与火焰平行的纤维变成直径为3.5μm～4.5μm的针状,针状纤维更易被火焰烧蚀而钝化。部分宏观孔(直径为1.0mm～1.26mm)、针状微孔及界面裂纹等缺陷处更易被烧蚀而变成烧蚀坑。包裹纤维的沥青炭层由于热解炭基体的不连续而出现了严重的剥蚀。高密度材料(1.85g/cm3)具有良好的抗烧蚀性能。

关键词：炭/炭复合材料炭纤维烧蚀

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Triple-Columned and multiple-Layered 3D Polymers:Design,Synthesis,Aggregation-Induced Emission(AIE),and Computational Study

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Research 2021年第1期2021卷 112-124页

作者： Guanzhao Wu Yangxue Liu Zhen Yang Liulei ma Yao Tang Xianliang Zhao Hossein Rouh Qixuan Zheng Peng Zhou Jia-Yin Wang farhan Siddique Sai Zhang Shengzhou Jin Daniel Unruh Adelia JAAquino Hans Lischka Kristin m.Hutchins Guigen Li Department of Chemistry and Biochemistry Texas Tech UniversityLubbockTexas 79409-1061USA Institute of Chemistry and Biomedical Sciences School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210093China School of Pharmaceutical Sciences and Technology Tianjin UniversityTianjin 300072China Department of mechanical Engineering Texas Tech UniversityLubbockTX 79409USA

Conjugated polymers and oligomers have great potentials in various fields,especially in materials and biological sciences because of their intriguing electronic and optoelectronic *** recent years,the through-space conjugation system has emerged as a new assembled pattern of multidimensional ***,a novel series of structurally condensed multicolumn/multilayer 3D polymers and oligomers have been designed and synthesized through one-pot Suzuki polycondensation(SPC).The intramolecularly stacked arrangement of polymers can be supported by either X-ray structural analysis or computational *** all cases,polymers were obtained with modest to good yields,as determined by GPC and 1 ***-TOF analysis has proven the speculation of the step-growth process of this *** computational study of ab initio and DFT calculations based on trimer and pentamer models gives details of the structures and the electronic *** results of optical and AIE research confirmed by calculation indicates that the present work would facilitate the research and applications in materials.

关键词： properties transition materials

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Virtual orthopedic assessment:main principles and specific regions

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World Journal of Orthopedics 2021年第9期12卷 672-684页

作者： Khaled m Emara Ramy Ahmed Diab mohamed Amr Shady Abdelghaffar mahmoud mohamed Nour Ahmed Abdelsalam mahmoud Ahmed Elshobaky mona farhan mostafa Gemeah Ahmed K Emara Orthopedic Surgery Department Ain Shams UniversityCairo 11566Egypt Orthopedic Surgery Department Bank Ahly HospitalCairo 11566Egypt Department of Health Care Innovation Arizona State UniversityArizonaAZ 85287United States Department of Orthopedic Surgery Cleveland ClinicOhioNY 44195United States

Telemedicine was originally created as a way to treat patients who were located in remote places far away from local health facilities or in areas with shortages of medical *** is still used today to address those problems,and is increasingly becoming a tool for convenient medical *** the emergence of pandemics,telemedicine became almost a mandatory and valuable option for continuing to provide medical care in various *** the threat of pandemic progress has continued for months and may continue for years,it is essential to validate existing tools to maintain clinical assessment and patient treatment to avoid negative consequences of the lack of medical ***,the establishment of a virtual assessment technique that can be conducted effectively is of outmost importance as a way of adapting to the current *** study evaluated the role of telemedicine in the assessment of various orthopedic pathologies by means of a systematic virtual evaluation.

关键词： Telemedicine Virtual assessment Orthopedics Epidemic diseases

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Regional Hypsometric Analysis of the Jordan Rift Drainage Basins (Jordan) Using Geographic Information System

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Open Journal of Geology 2016年第10期6卷 1312-1343页

作者： Yahya farhan Rami mousa Arij Dagarah Durgham Shtaya Department of Geography University of Jordan Amman Jordan

This research is intended to assess the regional pattern of hypsometric curves (HCs) and hypsometric integrals (HIs) for the watersheds draining into the Jordan Rift (River Jordan, the Dead Sea, and Wadi Araba watersheds). Hypsometric analysis was performed on 22 drainage basins using ASTER DEm (30 m resolution) and GIS. The area-elevation ratio method was utilized to extract the hypsometric integral values within a GIS environment. A prominent variation exists in the HC shapes and HI values. The highest hypsometric values are found for the Dead Sea ( = 0.87) and River Jordan ( = 0.77) watersheds. Whereas the lowest values ( = 0.51) characterized Wadi Araba catchments, except Wadi Nukhaileh (lower Wadi Araba) which yields an HI value of 0.26. Seventeen HCs pertained to the River Jordan and the Dead Sea watersheds evince remarkably upward convex shapes indicating that such drainage basins are less eroded, and at the youth-stage of the geomorphic cycle of erosion. Catchments draining to Wadi Araba are of intermediate HI values (0.41 - 0.58) which are associated with a balance, or dynamic equilibrium between erosion and tectonic processes. Accordingly, they correspond to a late mature stage of geomorphic development. Additionally, Wadi Nukhaileh yields the lowest HI value (0.26) and is associated with highly eroded terrain of late mature geomorphic evolution, approaching an old stage therefore, with distorted concave upward curves. High HI values indicate that these watersheds have been subjected to tectonic uplift, down faulting of the Rift and intense rejuvenation. Differences in HI values can be attributed to disparity in tectonic uplift rate, base level heights, and mean heights of the River Jordan watersheds, the Dead Sea and Wadi Araba watersheds, and variation in lithology, which caused noticeable differences in rejuvenation processes, and channel incision. Regression analysis reveals that R2 values which represent the degree of control of driving par

关键词： Hypsometric Analysis Tectonic Activity GIS ASTER DEm Regression Analysis Jordan Rift

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Hypsometric Analysis of Wadi mujib-Wala Watershed (Southern Jordan) Using Remote Sensing and GIS Techniques

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International Journal of Geosciences 2016年第2期7卷 158-176页

作者： Yahya farhan Adel Elgaziri Ibtisam Elmaji Intisar Ali Department of Geography University of Jordan Amman Jordan

Hypsometric analysis is considered an effective tool for understanding the stages of geomorphic evolution and geological development of river catchment, and for the delineation of erosional proneness of watershed. In the present study, twenty eight fourth order sub-basins of W. mujib-Wala (Southern Jordan) were selected, and hypsometric analysis was carried out using 30 m ASTER DEm. Elevation-relief ratio method was employed to calculate the hypsometric integral values within GIS environment. The hypsometric integral values range from 0.71 to 0.88, whereas, the hypsometric curves exhibit remarkably upward convex shapes which indicate that all sub-basins and the W. mujib-Wala watershed are at the youth-age stage of geomorphic development. Thus, they are of high susceptibility to erosion, incised channel erosion and mass movement activity. marginal differences exist in mass removal from the watershed and the 28 sub-basins are attributed to variation in tectonic effect, lithology and rejuvenation processes. The relation between basin area and hypsometric integral was examined using regression analysis. Results reveal that negative and weak relationships dominate, where r2 ranges from 0.05 to 0.478 which confirm with other results reported elsewhere. Indirect assessment of erosion status based on hypsometric integral values was validated using estimated sediment yield information related to wadi mujib and wadi Wala watersheds separately. The recorded sediment yields were in affirmation with high hypsometric integrals values, where higher values of hypsometric integrals and sediment yields occurred in the western part of the W. mujib-Wala watershed. These findings would help in the construction of appropriate soil and water conservation measures across the watershed and its sub-basins to control soil erosion, to conserve water, and to reduce sediment discharge into the W. mujib and W. Wala reservoirs.

关键词： Hypsometric Analysis Geomorphic Evolution RS GIS Hypsometric Integral Projected Profiles

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The Biological Activity of Some Bacteria as Biocides to Protect Sesame Crop （Sesamum indicum） from Fungi Diseases

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Journal of Agricultural Science and Technology(A) 2011年第3X期1卷 344-353页

作者： H. N. farhan A. T. Hameed H. m. Aobad Biology Department College of Education (AI-Qaim) AI-Anbar University Ramadi P.O. Box 55 Baghdad P.O. Box 55431 Iraq

Two experiments were conducted during 2006-2007 in Complete Randomized Design （CRD） to test the biological activity of Pseudomonas bacteria as biocides to protect sesame crop from some fungi and to evaluate its efficiency as plant growth promoting First experiment investigated the effects of Pseudomonas putida2 and Pseudomonas fluorescens3 on germination and seedlings growth of sesame crop against Pythium, Alternaria and Fusarium under plastic house conditions. Second experiment conducted in large pots to investigate the effects of the two bacterial isolates on some morphological, productive and physiological characters of sesame plants against same fungi under normal conditions. Results showed very low germination and slowly seedlings growth in Pythium, Fusarium and Alternaria treatments respectively, but adding bacterial vaccine of Pseudomonas putida2 and Pseudomonas fluorescens3 as a Biocide to fungi treatments, increased the germination percent and seedlings growth of sesame crop significantly, 20 days after planting compared with control treatment. In the second experiment, control treatment scored germination by 52%, while vaccines of Pseudornonas putida2 and Pseudomonas fluorescence3 treatments increased germination percentage in Fusarium, Pythium and Alternaria treatments significantly in average more than 71%. Both isolates increased significantly Leaf number per plant, leaf area per plant, height of plant, branches number per plant, total dry weight of shoot per plant and chlorophyll content compared with other and control treatments. Similar significant effect for both isolates was recorded in seeds number per pod per plant, total weight of 1,000 seeds per plant and pods number per plant and percentage of N, P, K in total dry weight of shoot per plant and oil percentage in seeds per plant compared with other and control treatments. P. putida2 increased oil percentage in seeds by 43.3, 48.0 and 45.0% respectively while with P. fluorescens3 increased to 4

关键词： Biological activity pseudomonas fungi biocides biofertilizers sesame crop.

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多模式匹配算法

多模式匹配算法

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作者： AHmED ABDO farhan SAIF 吉林大学

学位级别：硕士

大多数信息安全应用程序如反病毒程序以及入侵检测系统，都会选择多模式匹配算法作为其核心组成部分。该算法能够同时搜索千上万的模式串并且判断出这些模式串的位置。本文提出了两种多模式匹配算法，分别属于标准的多模式匹配算法和... 详细信息

大多数信息安全应用程序如反病毒程序以及入侵检测系统，都会选择多模式匹配算法作为其核心组成部分。该算法能够同时搜索千上万的模式串并且判断出这些模式串的位置。本文提出了两种多模式匹配算法，分别属于标准的多模式匹配算法和带有通配符的模式匹配算法。在标准方式下，多模式匹配算法的研究是基于哈希函数的。它对Karp-Rabin算法进行了扩展，其预处理时间为O(|P|)。如果没有匹配结果并且所有模式串长度相同，则算法执行时间为O(n+nlogk)。如果匹配后得到的模式串长度为l则验证函数需要时间l来检查是否真正匹配，其算法所用时间为O(n+nlogk+ooc(l))。如果模式串的长度不同则时间为O(mn+nk+ooc(l))(最会条件)，其中occ是真假匹配的数量。算法能够计算的最大的哈希值为xm(m+1)其中σ≈x/lnx。该算法不容易被攻击并且能够较好的运行在多处理器的并行模式下。此外本文提出的包含通配符的模式匹配算法是基于欧几里得距离和哈希函数的，该算法使用FFT来计算欧几里得距离和哈希函数。如果没有匹配结果，算法执行时间为O(k n logl)。如果匹配结果带有通配符并且通配符的符号仅存在于模式串中，需要时间为O(k n logl+ox)。如果文本中也包含了通配符，那么算法的执行时间要增加到O(k n log l+2ox)。对于匹配后的任意模式串，该算法存在1/σ的错误匹配率，其中k是模式串的数量，l为块长度，o是完成匹配的模式串的数量，x是完成匹配的模式串中块的数量。

关键词：多模式匹配 FFT 哈市函数欧几里得距离

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