检索结果-南通市图书馆

Preparation of Sm2O3 and co3O4 from Smco magnet swarf by hydrometallurgical processing in chloride media

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

journal of Rare Earths 2018年第7期36卷 725-732页

作者： k.Sahoo A.k.Nayak M.k.Ghosh k.Sarangi CSIR-Institute of Minerals and Materials Technology Bhubaneswar-751013OdishaIndia

The recycling of rare earth elements（REE） from end-of-life REE based products is an environment friendly proposition. Waste Sm-co based permanent magnet generated during machining is a good source for both Sm and co. In the present study a simpler process of acid leaching at 80 ℃ followed by solvent extraction, oxalate precipitation and calcination is described for producing pure Sm2 O3 and co3 O4. With either 10 vol% H2SO4 or 15 vol% HCI at 80 ℃ more than 95% Sm and co are leached in 1 *** of Sm from sulphate leach liquor with TBP or Aliquat 336 was poor. Although extraction with TOPS-99 is quantitative but Sm from sulphate leach liquor precipitated as Sm2（SO4）3·8 H2O. The chloride leach liquor at an initial pH of 2.5 and with 1.2 mol/L TOPS-99 shows requirement of 4-stages at A：O = 3：2. Stripping with oxalic acid precipitates Sm-oxalate which is calcined at 800 ℃ to produce Sm2 O3. co3 O4 is recovered from the raffinate through oxalate precipitation followed by calcination at450℃.

关键词： Smco magnet Samarium cobalt TOPS-99 Solvent extraction Precipitation stripping

Numerical Simulation of Duct Flow with Fog Droplets

在线全文

学校读者我要写书评

暂无评论

journal of Thermal Science 2010年第6期19卷 533-539页

作者： Abhilash Suryan j. k. Lee D. S. kim H. D. kim Department of Mechanical Engineering Andong National University FMTRC Daejoo Machinery Co.

Evaporative cooling is a widely used air cooling technique. In this method, evaporation of a liquid in the surrounding air cools the air in contact with it. In the current investigation, numerical simulations are carded out to visualize the evaporation and dynamics of tiny water droplets of different diameters in a long air duct. The effect of initial droplet size on the temperature and relative humidity distribution of the air stream in the duct is investigated. Three different initial conditions of air are considered to verify the influence of ambient conditions. Droplet spray patterns are also analyzed to identify the suitable locations for the spray nozzles within the duct. The resuits obtained are displayed in a series of plots to provide a clear understanding of the evaporative cooling process as well as the droplet dynamics within the ducts.

关键词： Evaporative cooling Fog droplet Two-phase flow Relative humidity

State of the Art Treatment of Non-Ferrous Castings 3-in-l Heat Treatment Systems combine Foundry Processes

在线全文

学校读者我要写书评

暂无评论

材料热处理学报 2004年第5期25卷 552-554页

作者： Volker R. knobloch CEC - consolidated Engineering co. Inc.

The interior of a high-pressure die-casting is of an unsatisfactory quality. Engine blocks made with this die casting process show lower specific engine performance. Pressure die-casting can hardly be heat treated for obvious reasons. PSM (Precision Sand Molds) process uses sand and organic binder to generate a mold and even allows the manufacturing of complex diesel engine blocks in aluminum alloys. combined technologies are available for semi-permanent mold castings with cores and castings made in Precision Sand Molds with organic binders. Castings are placed into the special heat treatment furnace immediately after pouring without the operations in stand alone machinery. This patented Sand Lion 3- in-1 technology processes hot castings and carries out three (3) foundry processes simultaneously in one (1) automated machine: 1) De-coring and sand removal; 2) Thermal sand reclamation; 3) Solution heat treatment of castings. The combination of several main casting processes is reflected in significant reductions of energy consumption, of production costs, and improving the quality of the castings. Audits in foundries using the 3-in-l process showed an average reduction in production costs of more than 30%.

关键词：沙模固溶热处理集成铸造流化床

Overview:Development of Clean Steel Production at Baosteel

在线全文

学校读者我要写书评

暂无评论

journal of Iron and Steel Research International 2011年第S2期18卷 36-41页

作者： HUANG Zong-ze,ZHENG Yi-yu,jIANG Xiao-fang,CUI jian(Baoshan Iron and Steel co Ltd.Shanghai 201900,China) Baoshan Iron & Steel co Ltd Shanghai 201900 Peoples R China

The development of clean steel technology at Baosteel can be dated back to the first production of IF steels and pipeline steels in the early *** the technology has gradually covered nearly the whole range of *** progressive development is introduced in the overview including the levels of cleanliness for some steel grades at *** technologies at different processes for the production of clean steel and the removal of some impurity elements in molten steel are also *** are given on the future research and development of clean steel technology at Baosteel in the aim to keep a sustainable development,which should focus on the basic research,inclusion control and making efficient use of inclusions,as well as stable and reliable low-cost manufacturing technology,removal of harmful residual elements,and the expanding of the technology to stainless steels and special steels.

关键词： clean steel inclusion secondary refining

Analysis and Discussion on controlling Inclusions in the Heavy Steel Plate of Wugang

在线全文

学校读者我要写书评

暂无评论

journal of Iron and Steel Research International 2011年第S1期18卷 941-946页

作者： LI jing-tao,ZHU Yi-jin,MO De-min (Wuyang Iron and Steel co.,Ltd.,Wuyang 462500,Henan,China) Wuyang Iron & Steel co Ltd Wuyang 462500 Henan Peoples R China

By taking sample at the location of NDT defective area of 120mmthickness low alloy steel plate,electrolyzing the bulk sample and making energy spectrum analysis on the inclusions,it is found that the inclusions represented by silicate and alumina are the major origin of *** inclusions in the steel have been significantly reduced by means of improvement measures like slag system and slag volume adjustment.

关键词： silicate and alumina inclusion Al slag system

Study on Heat Treatment Process of AB/EQ56 Steel Plate

在线全文

学校读者我要写书评

暂无评论

journal of Iron and Steel Research International 2011年第S1期18卷 978-982页

作者： ZHANG Zhi-jun,YU Zhong-xin,YANGYue-hui (Wuyang Iron and Steel co.,Ltd.,Wuyang 462500,Henan,China) Wuyang Iron & Steel co Ltd Wuyang 462500 Henan Peoples R China

The article mainly describes the development process of AB/EQ56 steel plate for ocean engineering with thickness ≤50mm in Wuyang Iron and Steel co.,Ltd.(Wugang),and studies the chemical analysis,metallographic structure,tensile strength and serial temperatures impact toughness of the steel *** results show that a good match of strength and toughness of AB/EQ56 steel plate with thickness ranging from 12mm to 95mm produced by ultra low alloying component control,controlled rolling and controlled cooling,proper quenching and tempering process,of which the properties are all conforming to the requirements of ABS *** steel plate has passed the certification of ABS and is qualified for *** than 7000 tons of such steel plate have been ordered,which mainly apply for the cantilever beam of offshore oil platform.

关键词： low alloy composition design controlled rolling quenching process microstructure property

Overview of surface ozone variability in East Asia-North Pacific region during IGAC/APARE(1994—1996)

在线全文

学校读者我要写书评

暂无评论

journal of Environmental Sciences 2004年第4期16卷 599-609页

作者： k.S. Lam T.j.Wang T. Wang j. Tang . Y.kajii C.M. Liu S.G. Shim Environmental Engineering Unit Department of Civil and Structural Engineering The Hong Kong Polytechnic University Hong Kong Department of Atmospheric Science Nanjing University Nanjing 210093 China Chinese Academy of Meteorological Science Beijing 100081 China Research Center for Advanced Science and Technology University of Tokyo Tokyo Japan Department of Atmospheric Science "National" Taiwan University Taipei Taiwan China Global Environmental Research Center Korea Institute of Science and Technology Seoul South Korea

Surface ozone(O\-3) was measured at Oki Island(japan), Cheju Island(South korea), Lanyu Island(Taiwan Province, China), Cape D'Aguilar(Hong kong SAR) and Lin'an, Longfenshan, Waliguan(China mainland) during january 1994—December 1996 as a component of IGAC/APARE(International Global Atmospheric Chemistry/East Asia-North Pacific Regional Experiment). This paper gave a joint discussion on the observational results at these stations over the study region. Investigations showed that the average of surface O 3 mixing ratios at the seven sites are 47.9±15.8, 48.1±17.9, 30.2±16.4, 31.6±17.5, 36.3±17.5, 34.8±11.5 and 48.2±9.5 ppbv, respectively. Significant diurnal variations of surface O 3 have been observed at Oki, Cheju, D’Aguilar, Lin'an and Longfenshan. Their annual averaged diurnal differences range from 8 to 23 ppbv and differ in each season. Surface O 3 at Lanyu and Waliguan do not show strong diurnal variability. Seasonal cycles of surface O 3 showed difference at the temperate and the subtropical remote sites. Oki has a summer minimum-spring maximum, while Lanyu has a summer minimum-autumn maximum. The suburban sites at D'Aguilar and Lin'an report high-level O 3 in autumn and low level O 3 in summer. Surface O 3 remains high in autumn and low in winter at the rural site Longfenshan. For the global background station Waliguan, surface O 3 exhibits a broad spring-summer maximum and autumn-winter minimum. The backward air trajectories to these sites have shown different pathways of long-range transport of air pollution from East Asia continent to North Pacific Ocean. Surface O 3 was found to be strongly and positively correlated with co at Oki and Lanyu, especially in spring and autumn, reflecting the substantial photochemical buildup of O\-3 on a regional scale. It is believed that the regional sources of pollution in East Asia have enhanced the average surface O 3 concentrations in the background atmosphere of North Pacific.

关键词： surface ozone trajectory transport photochemistry

In vivo and in vitro study of resorbable magnesium wires for medical implants:Mg purity,surface quality,Zn alloying and polymer coating

在线全文

学校读者我要写书评

暂无评论

journal of Magnesium and Alloys 2024年第6期12卷 2472-2488页

作者： k.Tesar j.Luňácková M.jex M.Žaloudková R.Vrbová M.Bartoš P.klein L.Vištejnová j.Dušková E.Filová Z.Sucharda M.Steinerová S.Habr k.Balík A.Singh Department of Materials Faculty of Nuclear Sciences and Physical EngineeringCzech Technical University in PragueTrojanova 13Prague 12000Czech Republic Institute of Physics Czech Academy of SciencesNa Slovance 2Prague 18221Czech Republic Institute of Dental Medicine First Faculty of MedicineCharles University and General University Hospital in PragueKaterinská32Prague 12801Czech Republic Department of Physics Faculty of Nuclear Sciences and Physical EngineeringCzech Technical University in PragueBrehová7Prague 11519Czech Republic Department of composites and Carbon Materials Institute of Rock Structure and MechanicsCzech Academy of SciencesV Holešovickách 41Prague 18209Czech Republic Institute of Anatomy First Faculty of MedicineCharles UniversityU Nemocnice 3Prague 12800Czech Republic Biomedical Center Faculty of Medicine in PilsenCharles UniversityAlej Svobody 76Pilsen 32300Czech Republic Department of Pathological Physiology Faculty of Medicine in PilsenCharles UniversityAlej Svobody 7632300 PilsenCzech Republic Department of Histology and Embryology Faculty of Medicine in PilsenCharles UniversityAlej Svobody 7632300 PilsenCzech Republic Institute of Pathology First Faculty of MedicineCharles University and General University Hospital in PragueStudnickova 2Prague 12800Czech Republic Department of Biomaterials and Tissue Engineering Institute of PhysiologyCzech Academy of SciencesVidenska 1083Prague 14200Czech Republic Research Center for Structural Materials National Institute for Materials Science1-2-1 SengenTsukuba 305-0047Japan

Magnesium is an excellent material in terms of biocompatibility and its corrosion products can serve as an active source for new bone ***,localized corrosion and H_(2)generation limit the potential of Mg-based *** low-alloyed Mg-Zn wires can strongly reduce problems with large H_(2)bubbles and improve the mechanical properties considerably while maintaining excellent long-term *** pickling and a polymer coating can be effectively used to lower the rate of in vivo *** this work,microstructural,mechanical,and in vitro characterization of 250μm and 300μm extruded wires made from ultra-pure Mg,commercially pure Mg,Mg-0.15Zn,Mg-0.4Zn and Mg-1Zn was ***,Mg-0.4Zn wires together with a variant coated with a copolymer of L-lactide andε-caprolactone were tested in vivo on artificially damaged Wistar rat *** on the observed Mg-induced osteogenesis,polymer-coated Mg wires with a small addition of Zn are a perspective material for bone-support applications,such as cerclage and fixation wires.

关键词： Magnesium Resorbable Mg wire Mg-Zn implant degradation Biocompatibility study Zn grain boundary segregation

渤海Qk17-2大位移水平井TCP射孔技术实践

在线全文

学校读者我要写书评

暂无评论

天然气工业 2002年第5期22卷 49-52页

作者：姜伟倪满友中海石油研究中心中海石油海洋测井公司

文章介绍国家 863项目 82 0 - 0 9海底大位移钻井技术 ,在渤海Qk1 7- 2项目中 ,成功地在大位移水平井完井中应用TCP射孔技术的情况 ,该项目在最大井深 4 690m ,最大井斜 86° ,最大水平位移 3 697m ,射孔段长近 10 0 0m的情况下 ,经过... 详细信息

文章介绍国家 863项目 82 0 - 0 9海底大位移钻井技术 ,在渤海Qk1 7- 2项目中 ,成功地在大位移水平井完井中应用TCP射孔技术的情况 ,该项目在最大井深 4 690m ,最大井斜 86° ,最大水平位移 3 697m ,射孔段长近 10 0 0m的情况下 ,经过项目组潜心研究 ,并且对油藏保护 ,射孔液 ,射孔工艺 ,作业方案等问题进行了严格评价、反复论证和精心筛选 ,使用了模拟射孔管柱下入精细校深技术 ,水平井仪器下入工具的泵送技术 ,正压差长井段射孔技术 ,井下压力延迟点火技术等四大技术 ,同时在实践中还总结和摸索出了一套作业方法并且初步形成了一套大位移水平井现场作业技术集成 ,在射孔压差选择、防止地层出砂 ,一次射孔井段长度确定 ,保证射孔枪起枪安全措施等方面取得了成功经验 ,保证了国家 863项目任务的圆满完成 ,同时也为大位移水平井进行TCP射孔作业提供了值得借鉴的经验 ,并且为今后进一步完善和发展我国海洋大位移水平井钻完井技术。

关键词：渤海Qk17-2大位移水平井 TCP 射孔技术油气井射孔工具井壁稳定