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高性能钕铁硼磁体的晶界调控与性能增强机制研究（英文）

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高性能钕铁硼磁体的晶界调控与性能增强机制研究（英文）

中国稀土学会2021学术年会

作者：黄清芳江庆政 Sajjad ur.Rehman 钟震晨江西理工大学福建省稀土功能材料重点实验室

Post-sinter annealing process plays an important role in the microstructur.s and magnetic properties of the Nd-Fe-B sintered *** this paper,systematically investigated are the magnetic properties and microstructur.s of the as-sintered and post-sinter annealed Nd-Fe-B magnets with Pr-Fe-Ga boundary *** choice consecutive annealing methods are adopted at high and low temperatur.s,namely the1 annealing at 880oC for 2 h and the 2 annealing at 880oC for 2 h and then 440oC for 3 *** is exceptional to find out that both the remanence and coercivity are improved after 2 annealing process for this type of *** coercivity is hugely increased from 10.09 kOe for the as-sintered sample to 17.19 kOe for the 2 annealed magnet,with a significant increment of 70.37%in *** extraordinary magnetic properties of Br=14.44 kGs,Hcj=17.19 kOe and (BH)max=51.08 MGOe are obtained for the designated Nd-Fe-B sintered magnets without heavy rare earth (HRE)elements manufactur.d by dual alloy *** Cur.e temperatur. is monotonically decreased from 634 K to 602 K while the c-axis alignment degree is optimized after *** observation and analysis indicate that the elemental distribution patterns are altered after the 2 *** diffusion of the aggregate(Pr,Nd,Cu,Ga)-rich phase from triple junctions into the grain boundary regions is ascribed to the formation of thin and continuous grain boundary layer,which is critical to improve the microstructur.s and magnetic properties.

关键词： Nd-Fe-B sintered magnets HRE-free Dual alloy method Post-sinter annealing Magnetic properties

化疗对通过FDG-PET／CT选择可行结直肠癌肝转移手术切除患者的影响：PET-CAM随机试验的单中心研究

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中华核医学与分子影像杂志 2017年第10期37卷 672-673页

作者：顾佳唐军苏州大学医学部放射医学与防护学院 215123 苏州大学附属第二医院核医学科 215004

目的关于FDG—PET在结直肠癌肝转移（***）手术治疗中作用的随机对照试验（RCT）结果表明，8％的患者其手术治疗决策发生了改变。该研究拟探讨***患者近期化疗和随后的PET探测转移性病灶之间的关系，并确定回顾性集中阅片是否会影响随... 详细信息

目的关于FDG—PET在结直肠癌肝转移（***）手术治疗中作用的随机对照试验（RCT）结果表明，8％的患者其手术治疗决策发生了改变。该研究拟探讨***患者近期化疗和随后的PET探测转移性病灶之间的关系，并确定回顾性集中阅片是否会影响随机试验的结果。方法研究纳入来自同一医院的120例患者。首次PET读片报告（PET-L）取自医院数据库，再次回顾性读片报告（PET-C）由其他至少1位阅片者独立完成。记录PET显像前未知的、未被列入手术切除计划的肝外病灶（EHD）和肝内转移灶（SALM）。根据术后病理结果和实体肿瘤疗效评估标准（RECIST），全部患者被分为化疗有效组和其他组。结果50例患者PET显像前90d内进行了化疗．其中37例有效。EHD为30／120（25％）。有效组内PET-L（7／37；18．9％），PET—C（7／37；18．9％）和CT（4／37；10．8％）发现EHD的结果无差异（P=0．375）；但在其他组，PET—L（15／83；18．1％）和PET．C（22／83；26．5％）发现的EHD比cT（8／83；9．6％）多（P=0．039和P〈0．001）。50例患者中，被PET—L和PET—C发现EHD和（或）SALM而没有被cT发现的患者数分别为14例（11．7％）和22例（18．3％）。结论近期化疗对PET显像探测结直肠癌转移的影响表明，先前进行的随机对照试验结果可能低估了可进行肝内转移病灶切除的患者数。

关键词： PET FDG 直结肠癌肝转移化疗

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世界的真相

中外文摘 2019年第20期 I0002-I0003页

作者：乌尔·加仑不详

乌尔·加仑(U·ur.Gallen)通过两张照片的配凑效果,来展示世界面临的严峻问题。

关键词：世界真相

Retraction note to “Development and characterization of hot dip aluminide coated stainless steel 316L”(J. Cent. South Univ., 10.1007/s11771-018-3937-y)

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Jour.al of Central South University 2020年第9期27卷 2792-2792页

作者： Sehrish MUKHTAR Waqas ASGHAR Zubair BUTT Zaheer ABBAS Mudaser ULLAH Rana ATTA-ur.REHMAN College of Engineering and Emerging Technologies University of the PunjabLahorePakistan University of Engineering and Technology Taxila 47050TaxilaPakistan Ningbo Institute of Materials Technology and Engineering(NIMTE) Chinese Academy of Sciences(CAS)Ningbo 315201China Mechatronics Engineering Department University of Engineering and Technology TaxilaChakwal Campus48800ChakwalPakistan MOE Key Lab for Liquid-Solid Structur. Evolution and Materials Processing Institute of Materials JoiningShandong UniversityJi’nan 250061China Department of Mechanical Engineering CETUniversity of SargodhaPakistan

The Editor-in-Chief has retracted this article [1] because Figur.s 11 and 12 appear to be identical with Figur.s 3 and 4respectively from a previously published article [2].Sehrish MUKHTAR,Waqas ASGHAR,Zubair BUTT,Zah... 详细信息

关键词： steel aluminide dip

Iron Deficiency Anemia in School Age Children in District Karak Khyber Pakhtunkhwa Province, Pakistan

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Open Jour.al of Blood Diseases 2014年第2期4卷 9-15页

作者： Irfan Ullah Muhammad Zahid Aftab Alam Sthanadar Iram Alam Sthanadar Pir Asmat Ali Mudassirshah Muhammad Ismail Khan Muhammad Kaleem Muhammad Aslam Khayyam Atiq-ur.Rehman Wasif Ullah Department of Zoology and Animal Sciences Post Graduate College Dargai Malakand Pakistan Department of Zoology Islamia College University Peshawar Pakistan Government Degree College Dara Adam Kheil FR Kohat Pakistan

The present study aimed to estimate the prevalence of iron deficiency anemia (IDA) in school-going children. Both Iron deficiency and iron deficiency anemia have considerable adverse effect on human health. Among the different negative health concerns, including stunt development, less developed immunity, lower IQ level, no proper physical work capacity, more fatigue, maternal mortality rates, young ones born with low birth weight, birth complications and infant mortality rates are some of the remarkable health concerns posed by iron deficiency level. Our.study sample was consisting of 420 school age children of both genders. The blood samples were collected in EDTA (Ethylenediaminetetraacetic acid) tubes from different school and health maternity centres by trained and veteran persons. Questionnaires were utilised for the data collection, at the time of blood samples collection. Hemoglobin (Hb), hematocrite (Hct), Mean Corpuscular Volume (MCV), Mean Corpuscular hemoglobin concentration (MCHC), white blood cell and red blood cell (RBC) were determine by automatic hematological analyzer model Symex Ks-21 having two reagents, cell pack and Stromatolyser-wwt 500 ml. The total percentage of anemia recorded in school age children was 34.0%. In tehsil Banda Daud Shah, the incidence of anemia was high up to 43.6% while in tehsil Takhti Nasrati and Karak was 32.1% and 26.4% respectively. The percentage was higher in girls (38.9%) than in boys (31.0%). The anemia percentage was recorded high (55.8%) in lower socioeconomic family children, than middle class (32.2%) and upper class (17%). The percentage of anemic children was also high (40%) in age group of 10 - 12 years. Pale skin was the most common symptom of anemia.

关键词： Iron Deficiency Anemia (IDA) Red Blood Cells (RBC) Hemoglobin (Hb) Hematocrit (Hct) Ethylenediamine Tetraacetic Acid (EDTA)

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纳米晶高丰度稀土永磁合金研究进展

纳米晶高丰度稀土永磁合金研究进展

中国稀土学会2020学术年会暨江西(赣州)稀土资源绿色开发与高效利用大会

作者：江庆政胡永峰 Sajjad ur.Rehman 钟震晨江西省稀土磁性材料及器件重点实验室&江西理工大学稀土磁性材料及器件研究所 Canadian Light Sour.e University of Saskatchewan

钕铁硼(Nd-Fe-B)磁体的广泛应用促使全球对中低丰度稀土元素钕、镨、镝、铽的需求猛增。然而,以镧(La)、铈(Ce)、钇(Y)为主的高丰度稀土元素在稀土永磁中仍未获得大量应用,造成稀土资源的严重不平衡利用。从原材料成本和国家战略安全角... 详细信息

钕铁硼(Nd-Fe-B)磁体的广泛应用促使全球对中低丰度稀土元素钕、镨、镝、铽的需求猛增。然而,以镧(La)、铈(Ce)、钇(Y)为主的高丰度稀土元素在稀土永磁中仍未获得大量应用,造成稀土资源的严重不平衡利用。从原材料成本和国家战略安全角度考虑,高性价比的高丰度稀土永磁的研究与开发势在必行。不同于Nd-Fe-B,含高丰度稀土的钕铁硼类永磁体在主相热稳定性、第二相种类、各元素的冶金及相析出行为、价态、微观结构等方面均与前者存在较大差异。我们对La、Y元素在永磁合金制备过程中的冶金行为及合金成分与Ce元素价态之间的内在关系进行了相关研究。

关键词：纳米晶高丰度稀土永磁冶金行为 Ce价态

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L形截面钢骨混凝土异形柱温度场分析

L形截面钢骨混凝土异形柱温度场分析

第二十一届全国现代结构工程学术研讨会

作者：张俞昕于洋魏宏先 ATTA ur.REHMAN 徐亚丰沈阳建筑大学土木工程学院

为了探究L形钢骨混凝土异形柱的温度场分布情况,本文根据现有的理论基础,通过ABAQUS有限元软件对L形钢骨混凝土异形柱的温度场分布情况进行模拟。本文的升温曲线采用的是ISO-834标准升温曲线,对异形柱进行不同时段的升温模拟。通过温度... 详细信息

为了探究L形钢骨混凝土异形柱的温度场分布情况,本文根据现有的理论基础,通过ABAQUS有限元软件对L形钢骨混凝土异形柱的温度场分布情况进行模拟。本文的升温曲线采用的是ISO-834标准升温曲线,对异形柱进行不同时段的升温模拟。通过温度场的分布云图可以清晰直观的看出异形柱截面的温度分布情况,并提取出温度—时间曲线,通过对比可以看出钢骨、混凝土在火灾中的升温情况。并且对比在不同参数下L形钢骨混凝土异形柱的升温情况,更好的了解L形钢骨混凝土异形柱的抗火性能。

关键词： L形钢骨混凝土异形柱温度场分析火灾有限元分析

Varicocele and infertility: Role of pressur. flow dynamics

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World Jour.al of Clinical ur.logy 2014年第3期3卷 340-343页

作者： Khaleeq ur.Rehman Muhammad-Quaid Zaman Habib ur.Rehman Hafsa Zaneb Department of ur.logy and Andrology FMH College of Medicine and DentistryLahore 54000 Pakistan Department of Physiology University of Veterinary and Animal SciencesLahore 54000 Pakistan Department of Anatomy and Histology University of Veterinary and Animal SciencesLahore 54000 Pakistan

Varicocele is prevalent in infertile individuals as well as in normal adolescents and *** has an increasing trend with growing *** individuals with varicocele,develop varying degrees of sperm abnormalities that range from mild to severe semen abnormalities,even azoospermia may *** main proposed featur.s of these abnormalities are incompetence of one-way valves of the draining veins of testes,that allow backflow of blood into *** backflow produces abnormally high intra-testicular pressur. and temperatur.,that has been confirmed by thermography and pressur. estimation in various *** varicocelectomy may reverse the pathologic effects on spermatogenesis in most patients,which points towards the cause and effect relationship of varicocele with testicular *** propose that the prolonged effect of gravity might or may not be the initiating factor for varicocele,as in our.experience,around 1/4th of hypogonadotropic hypogonadism patients who had no varicocele before treatment,developed varicocele within 3 to 6 mo of treatment with *** varicocele is produced by"Nutcrackerphenomenon",which is compression of left renal vein between the abdominal aorta and superior mesenteric *** deleterious effects of varicocele may develop slowly,causing delayed secondary infertility or rapidly,leading to azoospermia or individual may be spared of damage due to unknown factors that need fur.her research.

关键词： Varicocele Scrotal Doppler ultrasonography Testicular blood flow Pressur. flow dynamics Testes Infertility Oligospermia Aesthenospermia

纳米晶Ce-Fe-B基磁体的结构与性能调控

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纳米晶Ce-Fe-B基磁体的结构与性能调控

稀土元素镧铈钇应用研究研讨会暨广东省稀土产业技术联盟成立大会

钕铁硼(Nd-Fe-B)磁体的广泛应用促使全球对中低丰度稀土元素钕、镨、镝、铖的需求猛增。然而,以铈(Ce)为主的高丰度稀土元素在稀土永磁中仍未获得大量应用,造成稀土资源的严重不平衡利用。从原材料成本和国家战略安全角度考虑,高性价比... 详细信息

钕铁硼(Nd-Fe-B)磁体的广泛应用促使全球对中低丰度稀土元素钕、镨、镝、铖的需求猛增。然而,以铈(Ce)为主的高丰度稀土元素在稀土永磁中仍未获得大量应用,造成稀土资源的严重不平衡利用。从原材料成本和国家战略安全角度考虑,高性价比的高丰度稀土永磁的研究与开发势在必行。本文采用熔体快淬技术制备了纳米晶Ce-Fe-B基永磁合金,通过非稀土元素添加优化了合金的成分。Ce原子L边X射线吸收精细结构图谱(图1)表明,成分优化后合金中的Ce价态比重增加,而Ce价态比重降低。将低熔点NdCu合金粉末与上述优化后的Ce-Fe-B合金粉末混合,通过放电等离子烧结(SPS)技术制备了具有双主相结构的纳米晶(Nd,Ce)-Fe-B磁体。透射电镜结果(图2)显示,部分Nd原子扩散进入了主相晶粒内部,由于NdFeB化合物具有比CeFeB化合物更优异的内禀性能,(Nd,Ce)-Fe-B主相的形成有效改善了磁体的硬磁性能和热稳定性。与快淬合金相比,SPS磁体晶间交换耦合作用明显弱化,长程静磁相互作用增强。

关键词：纳米晶 Ce-Fe-B基磁体 Ce价态放电等离子烧结