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Investigations of physicochemical properties of dusts generated in mechanical reclamation process of spent moulding sands with alkaline resins

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China Foundry 2014年第2期11卷 132-138页

作者： R.Dańko M.Holtzer j.Dańko AGH University of Science and Technology Faculty of Foundry Engineering

Mechanical reclamation processes of spent moulding sands generate large amounts of postreclamation dusts mainly containing rubbed spent binding agents and quartz dusts. The amount of postreclamation dusts, depending in the reclamation system effi ciency and the reclaim dedusting system, can reach 5%-10% in relation to the total reclaimed spent moulding sand. The proper utilization of such material is a big problem facing foundries these days. This study presents the results of investigations of physicochemical properties of post- reclamation dusts. All tested dusts originated from various Polish cast steel plants applying the mechanical reclamation process of moulding sands with alkaline resins, obtained from different producers. Different dusts, delivered from foundries, were tested to determine their chemical composition, granular characterization, physicochemical and energetic properties. Presented results confi rmed assumptions that it is possible to utilize dusts generated during mechanical reclamation of used sands with organic resins as a source of energy.

关键词： dust recycling environmental protection reclamation moulding and core sands energy

Unimodal Sequences of Gorenstein Ideals of Codimension 4

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Acta Mathematica Sinica,English Series 1998年第4期14卷 563-568页

作者： Hyoung j. ko Department of Mathematics. Yonsei University 134 Shinchon-dong Seodaemun-gu. Seoul Korea 120-749

We present Gorenstein ideals of condimension 4 which have unimodal Hilbert functions.

关键词： k-configuration Hilbert function Minimal free resolution Gorenstein ideal of codimension 4

THE INFLUENCE OF PRECURSOR VARIABLES ON THE PHASE FORMATION, MICROSTRUCTURE AND TRANSPORT PROPERTY OF Bi-2223/Ag TAPES

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Acta Metallurgica Sinica(English Letters) 2003年第2期16卷 84-89页

作者： C.H.jiang j.M.Yoo j.W.ko G.W.Qiao Institute of Metal Research The Chinese Academy of SciencesShenyang 110016ChinaMaterials Engineering Dept.Korea Institute of Machinery&Materials66 Sangnam-DongChangwon641-010KoreaMaterials Engineering Dept.Korea Institute of Machinery&Materials66 Sangnam-DongChangwon641-010KoreaInstitute of Metal ResearchThe Chinese Academy of SciencesShenyang 110016China

The Bi-2223/Ag tapes were prepared with spray-died powders, which are of different particle sizes and phase assemblages by varying the annealing time in pure oxygen. Longer time annealing degraded the reactivity of precursor powder, which in turn resulted in an incomplete conversion from precursors to Bi-2223, porosity core and misaligned grains in fully processed tapes. The best jc in short pressed samples varied from 29.7 to 47kA/cm2 for the tapes made from different powders.

关键词： Bi-2223/Ag tape precursor powder critical current density

Degradation and resynthesis of chlorophyll during increased oxidative stress and prolonged darkness differ between annual and perennial flax(Linum L.)

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Oil Crop Science 2024年第2期9卷 121-130页

作者： Kenyon j. Nisbett Abida Alokozai Su Hyun Elizabeth ko G. Adam Mott jason C.L. Browna Department of Biological Sciences University of Toronto ScarboroughTorontoONCanada Department of Cell&Systems Biology University of TorontoTorontoONCanada Centre for the Analysis of Genome Evolution&Function University of TorontoTorontoONCanada

Among plants,there is considerable variation in lifespan:annuals live less than one year,whereas perennials live for several years,with the longest-living perennial having survived 43,600 *** proposed by the Disposable Soma Theory,this lifespan variation among plants likely reflects differential investment of limited energy and nutrient resources,with perennials investing more energy and nutrients into biomolecular maintenance compared to annuals in order to ensure persistence over multiple *** differential investment may be particularly important during periods of exogenous stress,which are known to accelerate biomolecular *** present study evaluated this hypothesis using annual and perennial flax(Linum L.)subjected to two exogenous stressors—increased oxidative stress(i.e.,foliar H2O2spraying)and complete prolonged *** chlorophyll has been shown to exhibit degradation in response to changes in environmental conditions,we utilized changes in chlorophyll levels during and after periods of exogenous stress to evaluate our *** predicted that i)perennials would exhibit a slower rate of chlorophyll degradation during exposure to exogenous stressors compared to annuals,and ii)perennials would exhibit a faster rate of chlorophyll resynthesis following such exposure compared to *** levels before,during,and after exposure to both exogenous stressors were measured in two separate trails,once using image colour analysis and once using *** chlorophyll degradation rates in response to oxidative stress did not differ between annuals and perennials,contrary to our predictions,chlorophyll resynthesis rates following such exposure were significantly higher in perennials,as *** plants were subjected to complete prolonged darkness,chlorophyll degradation rates were significantly lower in perennials than annuals,as predicted;however,when plants were subsequently reintroduced to natural photoperiod,ch

关键词： Ageing Life history Maximum lifespan Oxidative stress Somatic maintenance

Transcriptional Profi le by Cold Water Stress at the Booting Stage of japonica Rice

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分子植物育种 2007年第2期5卷 184-185页

作者： K.Y. Kim j.C. ko B.K. Kim K.I. Noh j.K. ko Y.D. Kim C.K. Kim Honam Agricultural Research Institute NICS RDA Iksan Chonbuk Korea

This study was carried out to identify molecular responses of the two varieties with different cold tolerance under cold water stress (13℃) at the booting stage. Transcriptional responses of the genes were analyzed in

关键词：冷水刺激作用种植技术稻子

Titania coating formation on hydrostatically extruded pure titanium by micro-arc oxidation method

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journal of Materials Science & Technology 2022年第16期111卷 224-235页

作者： Ł.Maj D.Wojtas A.jarz˛ebska M.Bieda K.Trembecka-Wójciga R.Chulist W.kozioł A.Góral A.Trelka K.janus j.Kawałko M.Kulczyk F.Muhaffel H.Çimeno˘glu K.Sztwiertnia Institute of Metallurgy and Materials Science Polish Academy of SciencesReymonta 25Krakow 30-059Poland Faculty of Physics and Applied Computer Science AGH University of Science and TechnologyKrakowPoland Academic Centre of Materials and Nanotechnology AGH University of Science and TechnologyKrakowPoland Institute of High Pressure Physics Polish Academy of SciencesWarsawPoland Department of Metallurgical and Materials Engineering Istanbul Technical UniversityIstanbulTurkey

In this work,the microstructure of titania coating fabricated on the surface of hydrostatically extruded titanium grade 4 with the use of the micro-arc oxidation method was *** surface topography and microstructure investigations performed with atomic force microscopy and scanning and transmission electron microscopy revealed that,by using an Na_(2)HPO_(4)electrolyte,a well-adherent porous coating is produced on the top surface and side walls of the extruded *** distribution of chemical elements was analyzed by using energy dispersive X-ray *** chemical elements dissolved in the electrolyte(Na,P and O)incorporated into the *** locates preferentially in the outer part of the coating,while phosphorus and oxygen are distributed throughout the whole *** most relevant finding shows that a grain refinement caused by a hydrostatic extrusion provoked an increase in density of high-angle grain boundaries(HAGB),which in turn secured the formation of a continuous amorphous layer close to the *** presence of this layer compensates for the effect of anisotropic substrate,producing a comparable and homogenous microstructure with a large number of micropores.

关键词： Micro-arc oxidation Titanium of commercial purity Hydrostatic extrusion Surface topography Microstructure

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大型桥梁结构健康监测的研究进展

钢结构 2008年第6期23卷 93-94页

作者： j.M. ko

桥梁管理局已经认识到,对大型桥梁实行长期结构健康监测的意义在于保证结构和运行安全发出损坏和老化的早期预警可以避免昂贵的维修甚至灾难性的坍塌。对大型桥梁建立长期监测系统一方面是在桥梁正常使用期内评估结构完整性、耐久性、... 详细信息

桥梁管理局已经认识到,对大型桥梁实行长期结构健康监测的意义在于保证结构和运行安全发出损坏和老化的早期预警可以避免昂贵的维修甚至灾难性的坍塌。对大型桥梁建立长期监测系统一方面是在桥梁正常使用期内评估结构完整性、耐久性、可靠性的信息,制定最佳的维护计划,保证安全运行。另一方面,从选择合适的传感器到结构健康评估系统的设计等方面,在不同水平提出技术挑战。本文对大型桥梁结构健康监测和应用方面的最新技术发展进行了探究。对不同学科的技术融合结构健康评估的范例的需求日益显著,这些需求能够真正帮助进行桥的修复、维护和紧急修理。

关键词：大型桥梁结构健康监测仪表测量系统损伤监测桥梁维护

编程语言易用性最低，却是迄今为止最强大的人机接口

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程序员 2014年第5期 10-11页

作者： Andrew j.ko 美国西雅图华盛顿大学信息学院

这是真的吗？当自己破译一些神秘的错误信息，调试一些悄无声息的故障，或者给一些没有很好存档的函数提供正确的参数时，我经常会这样思考。上周我在对一个难以理解的PHP错误信息绞尽脑汁时，把这样的说法发到了Twtter上。但是，编程... 详细信息

这是真的吗？当自己破译一些神秘的错误信息，调试一些悄无声息的故障，或者给一些没有很好存档的函数提供正确的参数时，我经常会这样思考。上周我在对一个难以理解的PHP错误信息绞尽脑汁时，把这样的说法发到了Twtter上。但是，编程语言是否真的易用性差呢？

关键词：编程语言易用性人机接口错误信息 PHP 破译

A Robust Approach for the Derivation of Closed-Form Green’s Functions for Microstrip Structures

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A Robust Approach for the Derivation of Closed-Form Green’s...