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Role of Grain Boundary Segregation in Texture Weakening of Mass-Produced Mg-Al-Zn-Ca Alloy Sheet Coils 晶界偏析在量产Mg-Al-Zn-Ca合金板卷织构弱化中的作用
Pub Date : 2019-07-27 DOI: 10.2139/ssrn.3427485
J. Kim, Junho Park
The role of grain boundary segregation in texture modification in mass-produced coils with high formability was investigated. In contrast to commercial Mg-3Al-1Zn (wt.%) alloy, texture weakening was observed in Mg-(1, 2, and 3)Al-1Zn-0.7Ca (wt.%) alloys sheets, which was contributed to solute segregation effect on grain boundaries. Moreover, texture weakening was more promoted by reducing Al contents in Mg-Al-Zn-Ca alloys sheets, leading to the highest index of Erichsen value of 9.1mm at room temperature.
研究了晶界偏析在量产高成形性线圈织构改性中的作用。与Mg- 3al - 1zn (wt.%)合金相比,Mg-(1、2和3)Al-1Zn-0.7Ca (wt.%)合金片材的织构弱化是由于晶界上的溶质偏析效应造成的。Mg-Al-Zn-Ca合金板材中Al含量的降低更能促进织构弱化,室温下的Erichsen指数最高,为9.1mm。
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引用次数: 0
Quantifying of Particle Shape Differences of Different Milled Barite Using a Novel Technique; Dynamic Image Analysis 用新技术定量测定不同磨矿重晶石的颗粒形状差异动态图像分析
Pub Date : 2019-07-10 DOI: 10.2139/ssrn.3417470
Ugur Ulusoy
In this study, shape analysis of barite mineral ground by various mills (ball, rod and autogenous) that are widely used in mineral processing, were achieved by the recent developed technique, namely; DIA and quantified shape differences by created different grinding in terms of the most common the shape parameters namely circularity (C) and bounding rectangle aspect ratio (BRAR). DIA results released that, ball milling produced particles with the highest BRAR and the lowest C values while the autogenous milling gave the highest C and the lowest BRAR values. Besides, these results, which were manually measured from microphotographs are in good agreement with results of previous studies performed by SEM technique. DIA can be used as a tool for the characterization of barite particles in some industries, where particular shape and morphology of barite is required such as paint, filler, and rubber industry.
本研究采用最新发展的技术,对选矿中广泛使用的各种磨机(球磨机、棒磨机和自磨机)磨出的重晶石矿物进行了形状分析。根据最常见的形状参数,即圆度(C)和边界矩形宽高比(BRAR),通过创建不同的磨削直径和量化形状差异。DIA结果表明,球磨得到的颗粒BRAR最高,C最低,而自磨得到的颗粒C最高,BRAR最低。此外,这些从显微照片中人工测量的结果与以前用扫描电镜技术进行的研究结果吻合得很好。在某些行业,如涂料、填料和橡胶行业,需要重晶石的特定形状和形态,DIA可以用作表征重晶石颗粒的工具。
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引用次数: 0
Comments on Experimental Assessment of the Thermodynamic Factor for Diffusion in Cocrfeni and Cocrfemnni High Entropy Alloys Cocrfeni和Cocrfemnni高熵合金中扩散热力学因素的实验评定
Pub Date : 2019-06-19 DOI: 10.2139/ssrn.3406391
I. Belova, G. Murch
In this contribution, as a response to the paper in Scripta Materialia, v.157, p.81, 2018, we show that the pseudo-binary approach for analysis of interdiffusion in multicomponent alloys has its reference value of the Manning factor (vacancy-wind factor) that is very different from true binary interdiffusion. In true binary interdiffusion, this factor is usually compared with unity. In the pseudo-binary analysis this reference value must be changed to the inverse of N1+N2, where Ni are the compositions (mole fractions), and components 1 and 2 are the atomic components that have different terminal compositions in the corresponding experiment.
在这篇文章中,作为对Scripta Materialia, v.157, p.81, 2018的论文的回应,我们表明,用于分析多组分合金中相互扩散的伪二元方法具有曼宁因子(空缺风因子)的参考价值,这与真正的二元相互扩散有很大不同。在真正的二元互扩散中,这个因素通常与统一进行比较。在伪二元分析中,必须将该参考值改为N1+N2的倒数,其中Ni为组分(摩尔分数),组分1和组分2为相应实验中具有不同末端组分的原子组分。
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引用次数: 0
Effect of Marine Diesel and Biodiesel Blend on Basic Fuel Properties: A Novel Study for Marine Diesel Engines 船用柴油和生物柴油混合燃料对基本燃料性能的影响:船用柴油机新研究
Pub Date : 2019-06-15 DOI: 10.31033/IJEMR.9.3.13
Idubor Fabian. I, Agberegha OrobomeL.
Biodiesel has received increased attention due to higher cetane number, flash point, lesser exhaust emission compared to diesel fuel. Important correlation of density, viscosity and flash point with diesel fuel for spectrum blends are still lacking. Therefore, in this study, waste oil biodiesel (WOB) was procured and blended with diesel fuel (B0) at volume ratios of 25%, 50% and 75%, which are referred to as B25, B50 and B75. The important fuel properties of the biodiesel-diesel fuel blends were also analyzed and correlations were established for the WOB and B0 blends. The result obtained show that density and viscosity with flash point can be modelled with the fourth degree and second degrees equations respectively and can be useful for industrial applications of diesel and biodiesel blends.
与柴油相比,生物柴油因其十六烷值高、闪点高、废气排放少而受到越来越多的关注。谱混合燃料的密度、粘度和闪点与柴油燃料的重要相关性仍然缺乏。因此,本研究采购废油生物柴油(WOB),与柴油(B0)按25%、50%和75%的体积比混合,分别称为B25、B50和B75。分析了生物柴油-柴油混合燃料的重要燃料性能,并建立了WOB和B0的相关性。结果表明,密度和粘度随闪点的变化可以分别用四度方程和二度方程来模拟,可用于柴油和生物柴油混合物的工业应用。
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引用次数: 0
Developing and Implementing a Web-Based Recycling System for Protecting the Green Environment 开发和实施网络回收系统,保护绿色环境
Pub Date : 2019-05-31 DOI: 10.5121/IJSEA.2019.10306
Dalal Al-Omairi, Wejdan AlNasheri, Waad Al-Qarni, Ibrahim Almarashdeh, M. Alsmadi, Muneerah Alshabanah, Daniah Alrajhi
Our society suffers a lot from the things that are thrown uselessly; these things may be beneficial to our society. On the other hand, communities suffer a lot of waste especially plastic waste; this has led to environmental pollution and depletion of natural resources. Therefore, this research aims to achieve sustainable development and achieve part of the Saudi Arabia vision 2030. Hence we have distributed a questionnaire to 88 responders, and based on the results of this study, which shows the importance of recycling and its impact on the environment and the extent of community interest in this subject and their supporters, The Let's Recycle site, based on the results of the questionnaire, will improve waste and plastics disposal in an environmentally positive manner.The proposed system was developed using the Unified Modelling Language (UML) and Microsoft Visual Studio2010 programming language.
我们的社会遭受了很多无用的东西;这些事情可能对我们的社会有益。另一方面,社区遭受了大量的废物,特别是塑料废物;这导致了环境污染和自然资源的枯竭。因此,本研究旨在实现可持续发展,实现沙特阿拉伯2030年愿景的一部分。因此,我们向88名回应者分发了一份问卷,并根据这项研究的结果,显示回收的重要性及其对环境的影响,以及社区对这一主题的兴趣程度及其支持者,根据问卷调查的结果,“让我们回收”网站将以环保的方式改善废物和塑料的处置。本系统采用统一建模语言(UML)和Microsoft Visual Studio2010编程语言进行开发。
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引用次数: 14
Application of An Encrypted Data Search Across Mobile Clouds 跨移动云的加密数据搜索应用
Pub Date : 2019-05-28 DOI: 10.2139/ssrn.3395106
P. Sowjanya, P. Sudhakar, Dr. V. Surya Narayana
Cloud storage provides a convenient and more storage at low cost, but data privacy is a major concept that prevents users from storing files on the cloud. One way of improving the data privacy is to encrypt the files before sending them onto the cloud and decrypt the files when they are downloaded. However, data encryption is a difficult task for the mobile devices, and data retrieval process is a complicated communication between the data user and cloud. With limited capacity and a limited battery life of mobile phones, these issues may introduce heavy overhead to computing and more power consumption for mobile device users, which makes the encrypted search over mobile cloud very difficult and as a challenge task for the user. In this paper, we have proposed, TEES, in which with more bandwidth and better energy efficient encrypted search over a mobile cloud. The proposed architecture removes the computation from mobile devices to the cloud, and hence we further can optimize the communications of the mobile clients and the cloud.
云存储以低成本提供了方便和更多的存储空间,但数据隐私是阻止用户在云上存储文件的主要概念。改善数据隐私的一种方法是在将文件发送到云端之前对其进行加密,并在下载文件时对其进行解密。然而,对于移动设备来说,数据加密是一项艰巨的任务,数据检索过程是数据用户与云之间复杂的通信。由于移动电话的容量和电池寿命有限,这些问题可能会给移动设备用户带来沉重的计算开销和更多的功耗,这使得在移动云上进行加密搜索非常困难,对用户来说是一项具有挑战性的任务。在本文中,我们提出了tee,其中具有更大的带宽和更节能的移动云加密搜索。所提出的架构将计算从移动设备转移到云端,从而进一步优化移动客户端与云的通信。
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引用次数: 1
Smart Viewer Counter for Digital Billboards 智能观众计数器的数字广告牌
Pub Date : 2019-05-17 DOI: 10.2139/ssrn.3419490
Yogesh P. Murumkar, Ashish Sharma, Shreya Uppala, Gaurav Sanas
This paper presents an approach for counting the number of people that are watching their advertisements on signals, near some specific area of interest. This would give the advertising company/advertisers that whether or not to show this particular advertise in that particular area. This will be helpful for organizations to make decision on spending money on advertising or to change the theme or strategy of advertise or to advertise in that area or not.
本文提出了一种计算在特定兴趣区域附近的信号上观看广告的人数的方法。这将给广告公司/广告商提供是否在特定区域显示特定广告的信息。这将有助于组织决定在广告上花钱或改变广告的主题或策略,或在该地区做广告或不做广告。
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引用次数: 2
Coagulation/Flocculation and Aerobic Treatment of Fenton Pre-treated Phenalkamine Condensate Fenton预处理苯萘胺凝聚物的混凝/絮凝及好氧处理
Pub Date : 2019-05-17 DOI: 10.2139/ssrn.3508533
Aswathy K R, Chaithra K V, Vishnu C Damodar, Dr. B. Manu
Phenalkamine is a curing agent produced by the reaction of cardanol, paraformaldehyde, and amine. It has high pH, high COD (Chemical Oxygen Demand), low BOD/COD ratio. In this study coagulation/flocculation and aerobic treatment of Fenton pre-treated Phenalkamine condensate (having COD of 1,50,000 mg/l ) was investigated.The optimum operating conditionin the Fenton's oxidation stage was pH-3.5, H2O2/COD ratio-1and Fe2+/H2O2 -1/30 and achieved COD removal efficiency was 80%. Fenton treated Phenalkamine condensate was subjected to  coagulation-flocculation (CF)  by using different coagulants like alum, ferrous sulphate, ferric chloride and polyacrylamide (anionic polymer) and the removal of COD at optimum dose of alum (200 mg/L), ferrous sulphate(200 mg/L), ferric chloride(300 mg/L) and polyacrylamide(150 mg/L),  were 43.40%, 32.35%, 35.29% and 47.05% respectively. Fenton treated Phenalkamine condensate was diluted and fed toaerobic reactors operated under different hydraulic retention time (HRT-2d,5d,10d) with 3500 mg/l MLSS (Mixed Liquor Suspended Solids). 10 d HRT was found to be suitable for the treatment and the average COD removal efficiency was 75%. Fenton’s oxidation followed by coagulation/flocculation or aerobic treatmentis a feasible treatment technique for Phenalkamine condensate
酚醛胺是由腰果酚、多聚甲醛和胺反应而成的固化剂。它具有高pH值,高COD(化学需氧量),低BOD/COD比。研究了Fenton预处理苯酚胺冷凝物(COD为15万mg/l)的混凝/絮凝及好氧处理。Fenton氧化阶段的最佳操作条件为pH-3.5, H2O2/COD比为1,Fe2+/H2O2 -1/30, COD去除率达80%。采用明矾、硫酸亚铁、氯化铁、聚丙烯酰胺(阴离子聚合物)等不同混凝剂对Fenton处理后的苯alkamine冷凝水进行混凝-絮凝(CF)处理,明矾(200 mg/L)、硫酸亚铁(200 mg/L)、氯化铁(300 mg/L)、聚丙烯酰胺(150 mg/L)的最佳投加量下COD去除率分别为43.40%、32.35%、35.29%和47.05%。Fenton处理后的苯萘胺冷凝液经稀释后,以3500mg /l MLSS(混合液悬浮物)投入不同水力停留时间(HRT-2d、5d、10d)的好氧反应器。10 d HRT处理效果较好,COD平均去除率为75%。Fenton氧化+混凝/絮凝或好氧处理是处理苯萘胺冷凝物的可行工艺
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引用次数: 0
Assessment of Material Selection for the CO2 Absorption Process with Aqueous MEA Solution Based on Results from Corrosion Monitoring at Technology Centre Mongstad 基于蒙斯塔德技术中心腐蚀监测结果的MEA水溶液CO2吸收工艺材料选择评估
Pub Date : 2019-05-01 DOI: 10.2139/ssrn.3366304
N. Flø, Leila Faramarzi, F. Iversen, Eirik Romslo Kleppe, Brit Graver, Heidi Nornes Bryntesen, K. Johnsen
Abstract In 2017 and 2018, Technology Centre Mongstad (TCM) performed long-term testing of CO2 capture with aqueous monoethanolamine (MEA) solvent through a series of test campaigns. As part of the test campaigns, a selection of materials was assessed for the CO2-MEA process by investigation and analysis of material test coupons. The test coupons were exposed to various operating conditions at five different locations in the plant. Both metal and rubber materials were tested in order to detect possible material compatibility issues with the CO2-MEA process. All metals proved to be suitable, except CS235 which in general showed severe corrosion rates exposed to the MEA solvent. However, a mid-campaign weight loss analysis indicated that CS235 might be acceptable for specific process conditions on the cold rich solvent location. No significant changes were observed on the tested rubber materials, however minor changes in hardness and tensile properties indicated some impact by the MEA solvent environment. In addition to examination of test coupons, the solvent was frequently monitored for typical factors that might indicate or influence corrosion such as the concentration of dissolved metals and heat stable salts (HSS). Some variability in average metal dissolution was observed between specific operational phases, however, the flue gas source did not seem to have significant effect on metal dissolution.
2017年和2018年,蒙斯塔德技术中心(TCM)通过一系列测试活动,对单乙醇胺(MEA)水溶液捕集CO2进行了长期测试。作为测试活动的一部分,通过对材料测试券的调查和分析,对CO2-MEA过程的材料选择进行了评估。测试板在工厂的五个不同位置暴露在不同的操作条件下。金属和橡胶材料都进行了测试,以检测二氧化碳- mea工艺中可能存在的材料兼容性问题。除CS235外,所有金属都被证明是合适的,CS235暴露在MEA溶剂中通常表现出严重的腐蚀速率。然而,一项中期失重分析表明,CS235在冷富溶剂位置的特定工艺条件下可能是可以接受的。测试的橡胶材料没有明显的变化,但硬度和拉伸性能的微小变化表明受到MEA溶剂环境的影响。除了检查试样外,还经常监测溶剂中可能指示或影响腐蚀的典型因素,如溶解金属和热稳定盐(HSS)的浓度。在具体操作阶段之间观察到平均金属溶解度存在一些差异,但是,烟气源似乎对金属溶解度没有显著影响。
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引用次数: 6
Pulsed Flow in a Vertical Channel with Discrete Heat Sources 具有离散热源的垂直通道中的脉冲流动
Pub Date : 2019-04-21 DOI: 10.2139/ssrn.3372913
A. Korichi, Nassim Laouche
This work is a numerical simulation of pulsed flow in an adiabatic vertical parallel plate channel with four discrete heat sources on one wall of the channel and subjected to a sinusoidal profile velocity at the inlet. The finite volume method was used to solve governing equations using open source OpenFoam free code. The effects of certain topical parameters such as pulsation amplitude and frequency and Richardson number are studied. The results reveal the flow behaviour and temperature distribution are strongly affected by the pulsation of the velocity at the inlet and the rate of heat transfer during a pulsation cycle increases considerably by increasing the pulsation amplitude.
本研究是一个在绝热垂直平行板通道中脉冲流动的数值模拟,在通道的一个壁面上有四个离散的热源,并且在入口处受到正弦剖面速度的影响。利用开放源代码OpenFoam免费代码,采用有限体积法求解控制方程。研究了脉动幅值、频率和理查德森数等局部参数的影响。结果表明,进口速度脉动对流动特性和温度分布有强烈的影响,脉动周期内换热速率通过增大脉动幅值而显著提高。
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引用次数: 0
期刊
Materials Processing & Manufacturing eJournal
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