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POWER FACTOR OF Bi2Te3 AND Sb2Te3 ENHANCED BY HIGH DENSITY AND HARDNESS 高密度和高硬度提高了 Bi2Te3 和 Sb2Te3 的功率系数
IF 0.2 Q4 Engineering Pub Date : 2023-12-14 DOI: 10.55766/sujst-2023-05-e02873
Surasak Ruamruk, B. Chayasombat, K. Singsoog, A. Vora–ud, W. Namhongsa, P. Pilasuta, T. Seetawan
The power factor is an indicator of the performance of thermoelectric materials. Many researchers improved the thermoelectric conversion efficiency of materials by various techniques such as doping, substitution, and decreasing particle size for dense samples. We present Bi2Te3 and Sb2Te3 materials prepared by hot pressing method at 673 K for 2 h in Ar atmosphere. Bulk samples were investigated for their crystalline structure, hardness, and power factor by XRD, micro-Vickers hardness, and ZEM-3, respectively. The Seebeck coefficient, electrical resistivity, and power factor of n- Bi2Te3 and p- Bi2Te3 bulk samples were higher than literature data in the same temperature range of 325 to 475 K. The higher power factor value of Bi2Te3 and Bi2Te3 bulk samples of this study have resulted from the high density and high micro-Vickers hardness of the samples.
功率因数是衡量热电材料性能的指标。许多研究人员通过掺杂、替代、减小致密样品的粒径等各种技术提高了材料的热电转换效率。我们介绍了在氩气环境中于 673 K 下热压 2 小时制备的 Bi2Te3 和 Sb2Te3 材料。分别通过 XRD、显微维氏硬度和 ZEM-3 对块状样品的晶体结构、硬度和功率因数进行了研究。在 325 至 475 K 的相同温度范围内,n- Bi2Te3 和 p- Bi2Te3 块状样品的塞贝克系数、电阻率和功率因数均高于文献数据。
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引用次数: 0
ELECTRICAL PROPERTIES OF MULTI-VALENT ALTERNATE ABO3 PEROVSKITE (KNN) MULTI-FUNCTIONALFERROELECTRIC CERAMICS 多价交替 ABO3 包晶体(KNN)多功能铁电陶瓷的电学特性
IF 0.2 Q4 Engineering Pub Date : 2023-12-14 DOI: 10.55766/sujst-2023-03-e03037
Mohammed Abdul Basheer, A. Rajasri, Syed Tahseen Hussain, Nandiraju Venkata Prasad
Ecological-friendly and unhazardous materials are being prepared by the scientific community in search of novel lead-free ferroelectric materials. K0.5Na0.5NbO3belonging to the ABO3 perovskite was found to be promising ferroelectric lead-free material. A new set of compound, namely, double dopant LKNZN compound was prepared by solid state route. Here, Lithium is partially replaced with Sodium, at A-site, and Zirconium substituted with Niobium, at B-site. The compositional formula of the present investigations is: [((K0.5Na0.5)(1-x)Lix) (Zr0.025Nb0.98)O3], where x=0, and 0.025 9 (labelled as KNN1 and KNN2). In addition we have prepared (K0.5(Na0.475Li0.025)) (Zr0.025Nb0.98)O3 (labelled as KNN3). XRD patterns obtained at room temperaturehave shown maximum intensity peak of (111), confirms the formation of a single-phase. SEM pictures of KNN1 and KNN2 have shown cubical grain with bimodal grain distribution, whereas KNN3 consist of circular bimodal grain distribution. Delectric measurements were studied on the said above samples. It is observed a hump around 200°Cand dielectric transition at 4520°C for all the samples. From this it is evident that: (i) the samples are transforming from orthorhombic phase to tetragonal phase near 200°C (ii) around 420°C, samples transform from tetragonal phase to cubic phase. Theresults were corroborated to the tolerance factor and lattice distortions.
为寻找新型无铅铁电材料,科学界正在制备生态友好型无害材料。研究发现,属于 ABO3 包晶的 K0.5Na0.5NbO3 是一种很有前途的无铅铁电材料。通过固态路线制备了一组新化合物,即双掺杂 LKNZN 化合物。其中,锂在 A 位被钠部分取代,锆在 B 位被铌取代。本研究的组成式为[((K0.5Na0.5)(1-x)Lix)(Zr0.025Nb0.98)O3],其中 x=0 和 0.025 9(标记为 KNN1 和 KNN2)。此外,我们还制备了 (K0.5(Na0.475Li0.025)) (Zr0.025Nb0.98)O3(标记为 KNN3)。室温下获得的 XRD 图谱显示出最大强度峰(111),证实了单相的形成。KNN1 和 KNN2 的扫描电镜照片显示了具有双峰晶粒分布的立方晶粒,而 KNN3 则由圆形双峰晶粒分布组成。对上述样品进行了介电测量。观察到所有样品在 200°C 左右出现驼峰,在 4520°C 出现介电转变。由此可见(i) 在 200°C 附近,样品从正方相转变为四方相 (ii) 在 420°C 附近,样品从四方相转变为立方相。这些结果与公差系数和晶格畸变相吻合。
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引用次数: 0
EFFECT OF h-BN AS AN ADDITIVE ON PHYSICAL AND MECHANICAL PROPERTIES OF Al2TiO5 COMPOSITE 添加剂 h-BN 对 Al2TiO5 复合物物理和机械性能的影响
IF 0.2 Q4 Engineering Pub Date : 2023-12-14 DOI: 10.55766/sujst-2023-05-e02854
Paramapat Treetornkeerati, Montree Hankoy, M. Kitiwan, Mana Rodchom, S. Vichaphund, D. Atong, P. Tunthawiroon
Aluminum titanate (Al2TiO5) is a promising material for high-temperature applications due to its low thermal expansion, high melting point, and excellent corrosion resistance. In this study, the effect of h-BN addition on the properties of Al2TiO5 composites was investigated. The composites were prepared by sintering a mixture of Al2O3 and TiO2 at a 1:1 molar ratio, with varying amounts of h-BN (5-20 mol%) added to the mixture. The samples were sintered at 1,500ºC for 4 h in an N2 atmosphere, and the bulk density, porosity, phase transition, microstructure, flexural strength, and hardness of the composites were investigated. XRD analysis confirmed the presence of Al2TiO5, Al2O3, and Al18B4O33 phases in the composites. The addition of h-BN in increasing amounts from 5 to 20 mol% resulted in a gradual improvement in the bulk density, flexural strength, and hardness of the Al2TiO5 composites. The composite with the highest h-BN content (20 mol%) exhibited a bulk density of 3.12 g/cm3, as well as the highest flexural strength and hardness values of 123.6±8.9 MPa and 11.2±4.1 GPa, respectively.
钛酸铝(Al2TiO5)具有热膨胀率低、熔点高和优异的耐腐蚀性等特点,是一种很有前途的高温应用材料。本研究探讨了添加 h-BN 对 Al2TiO5 复合材料性能的影响。复合材料是通过烧结摩尔比为 1:1 的 Al2O3 和 TiO2 混合物制备的,混合物中添加了不同量的 h-BN(5-20 摩尔%)。样品在 1,500ºC 的氮气环境中烧结 4 小时,并对复合材料的体积密度、孔隙率、相变、微观结构、抗弯强度和硬度进行了研究。XRD 分析证实了复合材料中存在 Al2TiO5、Al2O3 和 Al18B4O33 相。h-BN 的添加量从 5 mol% 增加到 20 mol%,使 Al2TiO5 复合材料的体积密度、抗弯强度和硬度逐渐提高。h-BN 含量最高(20 摩尔%)的复合材料的体积密度为 3.12 g/cm3,弯曲强度和硬度值也最高,分别为 123.6±8.9 MPa 和 11.2±4.1 GPa。
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引用次数: 0
EFFECT OF REFUSE-DERIVED FUEL FEEDING RATIO ON PERFORMANCE AND STABILITY OF COMBUSTION TEMPERATURE CONTROL 垃圾衍生燃料进料比对燃烧温度控制性能和稳定性的影响
IF 0.2 Q4 Engineering Pub Date : 2023-12-14 DOI: 10.55766/sujst-2023-05-e0936
Nontakorn Phakphoom, P. Liplap, J. Wannapeera, Thipsuphin Hinsui, W. Arjharn, Thitikorn kijjanasiri, Kanchanaporn Sribunrueang
In this study, the effect of Refuse-Derived Fuel type 3 (RDF-3) feeding ratio on a performance and a stability of combustion temperature control was exmined. A new direct-combustion furnace was designed and constructed for co-combustion of RDF-3 and woodchip (WC) feedstock. In this work, four main ratios on wet basis of WC and RDF-3; 100 : 0, 90 : 10, 80 : 20, and 70 : 30 wt.% were tested at the combustion temperature of 970°C. The results showed that the complete combustion was achieved from all of feeding ratios. From an actual fuel feed rate, an increase in RDF mixing ratio could reduce the using of pure woodchip by 5.3 wt.%, 14.3 wt.% and 34.0 wt.% when mixing the RDF at 10 wt.%, 20 wt.% and 30 wt.%, respectively. At increasing of RDF mixing ratio, non-smoothy burning was also found to increase, however, a more rapid ignition behavior of was achieved
本研究探讨了垃圾衍生燃料 3 型(RDF-3)进料比对性能和燃烧温度控制稳定性的影响。设计并建造了一个新的直接燃烧炉,用于 RDF-3 和木屑(WC)原料的共同燃烧。在这项工作中,在 970°C 的燃烧温度下测试了 WC 和 RDF-3 的四种主要湿基比例:100:0、90:10、80:20 和 70:30。结果表明,所有进料比都实现了完全燃烧。从实际燃料进料率来看,当混合比例分别为 10 重量%、20 重量% 和 30 重量%时,增加混合比例可使纯木屑的使用量分别减少 5.3 重量%、14.3 重量% 和 34.0 重量%。随着 RDF 混合率的增加,非光滑燃烧也有所增加,但点火速度更快。
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引用次数: 0
A STUDY ON SiC SUSCEPTOR CONFIGURATION FOR MICROWAVE HYBRID HEATING 用于微波混合加热的碳化硅吸附器配置研究
IF 0.2 Q4 Engineering Pub Date : 2023-12-14 DOI: 10.55766/sujst-2023-05-e03043
Akawat Ngamkiatpaisan, Montree Hankoy, M. Kitiwan, N. Keawprak, P. Tunthawiroon
Microwave hybrid heating (MHH) is a novel method to enhance ceramic sintering at high temperatures. The heating mechanism by MHH involves two directions of heat transfer for materials: microwaves heat the sample from the inside out, while the susceptor provides conventional heating from the outside. This unique heating mechanism offers several advantages, including uniform heating, rapid sintering, and enhanced microstructure and properties of materials. This study investigates the configuration of silicon carbide (SiC) susceptors for microwave hybrid heating. The microwave oven (multi-mode, 2.45 GHz, 1.2 kW) was modified with a ceramic insulator housing to maintain the temperature in the chamber. The effects of different configurations of SiC susceptors and microwave powers on the heating rate and maximum temperature were investigated. SiC susceptor plates were placed in the microwave oven using 3 different configurations, and for each condition, the microwave power was varied at 40, 60, 80, and 100% (480, 720, 960, and 1,200 W). The temperature in the microwave chamber was recorded until it reached 900°C or after 30 min of heating. Using two plates of SiC susceptor at 100 % power resulted in the highest heating rate of 62°C/min to reach 925°C. The results of this study offer guidance for the selection of appropriate heating conditions for individual ceramic materials, which can lead to more effective sintering processes.
微波混合加热(MHH)是一种在高温下增强陶瓷烧结的新方法。MHH 的加热机制涉及材料的两个传热方向:微波从内向外加热样品,而感热体则从外向内提供传统加热。这种独特的加热机制具有多个优点,包括加热均匀、烧结迅速、材料的微观结构和性能得到改善。本研究调查了用于微波混合加热的碳化硅(SiC)感应器的配置。微波炉(多模式,2.45 GHz,1.2 kW)改装了陶瓷绝缘体外壳,以保持炉腔内的温度。研究了不同配置的碳化硅吸收体和微波功率对加热速率和最高温度的影响。使用 3 种不同的配置将碳化硅吸收板放入微波炉,每种条件下的微波功率分别为 40、60、80 和 100%(480、720、960 和 1,200 W)。微波室的温度一直记录到达到 900°C 或加热 30 分钟后。在 100 % 功率下使用两片碳化硅感热体,最高加热速度为 62°C/分钟,达到 925°C。这项研究的结果为针对各种陶瓷材料选择适当的加热条件提供了指导,从而可以提高烧结工艺的效率。
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引用次数: 0
PHYSICAL PROPERTIES CORRESPONDING TO COMFORT FEEL OF BEDDING FABRICS 与床上用品面料舒适感相对应的物理特性
IF 0.2 Q4 Engineering Pub Date : 2023-12-13 DOI: 10.55766/sujst-2023-04-e02268
Saracha Kitchagan, Phannaphat Phromphen, A. Soontrunnarudrungsri, Pithalai Phoophat
The market for bedding products in Thailand now offers a wide range of physical attributes (fiber types, structures, fabric densities, thicknesses, and weights) that produce a variety of tactile sensations and comfort qualities. This study investigated the comfort properties of bedding fabrics in Thailand. Twenty-one bedding fabric samples were collected and measured for their mechanical and surface properties based on the Kawabata evaluation system for fabric (KES-F) as well as the horizontal wicking test and abrasion resistance, air permeability, wrinkle recovery, and thermal resistance (Qmax). The primary hand value (HV) and total hand value (THV) were calculated using the Kawabata hand evaluation equation KN-201-LDY describing women's thin dress fabric, using 5 different properties from the KES-F (tensile, shear, bending, compression, and surface friction). The principle component analysis (PCA) and cluster analysis of the physical properties of fabric samples showed that the samples could be placed in 4 groups. The first group was mostly cotton woven samples. The second group consisted of 2 samples that were both knitted, while the third group was mostly mixed (M) fabric samples. The last group contained cotton and M cotton samples. The first cluster was considered to provide the best hand-feel characteristics of all 4 clusters, while the second cluster was considered the least desirable based on hand-feel. The findings of this study should assist the bedding textile sector in developing new products.
目前,泰国市场上的床上用品具有多种物理属性(纤维类型、结构、织物密度、厚度和重量),可产生各种触感和舒适性。本研究调查了泰国床上用品织物的舒适特性。研究人员收集了 21 种床上用品织物样本,并根据织物川畑(Kawabata)评估系统(KES-F)、水平排汗测试、耐磨性、透气性、皱纹恢复性和热阻(Qmax)对其机械和表面特性进行了测量。主要手感值(HV)和总手感值(THV)是使用川端手感评价方程 KN-201-LDY 计算得出的,该方程描述了女式薄礼服面料,并使用了 KES-F 中的 5 种不同特性(拉伸、剪切、弯曲、压缩和表面摩擦)。织物样品物理性质的主成分分析(PCA)和聚类分析显示,样品可分为 4 组。第一组主要是棉织样品。第二组包括 2 个针织样品,第三组主要是混合(M)织物样品。最后一组包括棉布和 M 型棉布样品。第一组被认为是所有 4 组样品中手感最好的一组,而第二组被认为是手感最差的一组。这项研究的结果应有助于床上用品纺织品行业开发新产品。
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引用次数: 0
Resistance of Chloride and Sulfate of Geopolymer based on fly ash and silica fume as alternative raw materials. 以粉煤灰和硅灰为替代原料的土工聚合物的耐氯化物和硫酸盐性能。
IF 0.2 Q4 Engineering Pub Date : 2023-12-13 DOI: 10.55766/sujst-2023-05-e01092
S. Rattanachan, Rawee Dangwiriyakul, Oranich Thongsri, Paritat Thaitalay, Sawitri Srisuwan
Concrete durability to salt resistance is the main factor affecting the service life of concrete used in acid or salt environment. This project aims to develop the concrete composition for salt resistance of chloride and sulfate at 50,000 mg/L as the simulated salt solution in this project. Geopolymer consisted of 10%wt ordinary Portland cement (OPC  type 1) with the other alternative raw materials which were pozzolanic materials and wastes (fly ash, silica fume and rice husk ash). The various parameters which were type and content of the alternative raw materials, plasticizers content, liquid to powder ratio, etc, were studied for developing the compressive strength of geopolymer after soaking in the simulated salt solution for 14 days as comparison with those in the normal water and the ordinary Portland cement. The results found that geopolymer consisted of fly ash and silica fume with the mixture of NaOH (10M): Na2SiO3 in a ratio of 24:16 (wt./wt.) could improve the compressive strength of geopolymer cement after soaking in the simulated sulfate salt solution for 14 days as compared to the ordinary Portland cement type 1 and type 5. Moreover, this geopolymer showed low density which was beneficial for use in the engineering structure in the high salt area. In addition, the change of chemical reaction and phases after setting of geopolymer in high concentrations of chloride and sulfate solution were studied to understand the mechanism of salt resistance of geopolymer and to develop the concrete composition for salt resistance in the future.
混凝土的耐盐耐久性是影响在酸或盐环境中使用的混凝土使用寿命的主要因素。本项目以 50,000 mg/L 的模拟盐溶液为条件,旨在开发抗氯化物和硫酸盐盐的混凝土成分。土工聚合物由 10%重量的普通硅酸盐水泥(OPC 类型 1)和其他可替代的原材料组成,这些原材料包括水泥基材料和废料(粉煤灰、硅灰和稻壳灰)。研究了替代原材料的类型和含量、增塑剂含量、液粉比等各种参数,以确定土工聚合物在模拟盐溶液中浸泡 14 天后的抗压强度,并与在普通水和普通硅酸盐水泥中的抗压强度进行比较。结果发现,土工聚合物由粉煤灰和硅灰与 NaOH(10M)、Na2SiO3(10M)和 Na2SiO3(10M)的混合物组成:与普通硅酸盐水泥 1 型和 5 型相比,在模拟硫酸盐盐溶液中浸泡 14 天后,由粉煤灰和硅灰与 NaOH(10M):Na2SiO3 的混合物组成的土工聚合物可提高土工聚合物水泥的抗压强度。此外,这种土工聚合物的密度较低,有利于在高盐地区的工程结构中使用。此外,还研究了土工聚合物在高浓度氯化物和硫酸盐溶液中凝固后的化学反应和物相变化,以了解土工聚合物的抗盐机理,并为今后开发抗盐混凝土成分提供参考。
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引用次数: 0
EFFECT OF PRASEODYMIUM ION CONCENTRATION ON OPTICAL AND LUMINESCENCE PROPERTIES OF TELLURITE GLASSES PRODUCED BY MELT-QUENCHING TECHNIQUE 镨离子浓度对熔淬技术制备的碲玻璃的光学和发光特性的影响
IF 0.2 Q4 Engineering Pub Date : 2023-12-13 DOI: 10.55766/sujst-2023-05-e03009
Kittipun Boonin, Pattarawagee Yasaka, J. Kaewkhao, N. Sangwaranatee
Tellurite glasses with different concentration of praseodymium (Pr3+) ion was produced by melt-quenching technique. The effect of Pr3+ concentration on optical and luminescence properties was presented. The optical absorption spectra of Pr3+ ions in glasses were recorded in the UV-VIS-NIR region. By using the integrated absorption spectrum, the Judd-ofelt parameters for Pr3+ ions were derived. The Judd-Ofelt theory was used to calculate the radiative transition probability, stimulated emission cross-section, and branching ratio of the glasses. These findings support the use of these glasses in laser and other optical device applications.
通过熔淬技术制备了不同镨(Pr3+)离子浓度的碲玻璃。研究结果表明了 Pr3+ 浓度对光学和发光特性的影响。在 UV-VIS-NIR 区域记录了玻璃中 Pr3+ 离子的光学吸收光谱。通过使用积分吸收光谱,得出了 Pr3+ 离子的 Judd-ofelt 参数。利用 Judd-Ofelt 理论计算了玻璃的辐射转变概率、受激发射截面和分支率。这些发现支持了这些玻璃在激光和其他光学设备中的应用。
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引用次数: 0
Clustered Regularly Interspaced Short Palindromic Repeats- a new era in Genomic technology and its applications in Theranostics 成簇的正则间隔短联合重复序列--基因组技术的新时代及其在治疗学中的应用
IF 0.2 Q4 Engineering Pub Date : 2023-12-13 DOI: 10.55766/sujst-2023-04-e0229
Karthik Rajaram mohan, Saramma Mathew Fenn, Ramachandra Reddy
Clustered Regularly Interspaced Short Palindromic Repeats is termed as CRISPR. Bacteria having "spacer" sequences of deoxyribonucleic acid between the repeats of genomic sequences that resemble genomic sequences in viruses were found to have repetitive DNA sequences known as CRISPR.The CRISPR technology in genetic engineering has revolutionalized the field of medicine in treating various genetically linked diseases that are difficult to treat such as Lebers Congenital amaurosis, in which there is bi-allelic deletion caused by mutation in mitochondrial DNA MT-ND4(NADH ubiquinone oxidoreductase chain4) 1178G are treated by intravitreous injection of AAV2-ND4 produced by CRISPR-Cas9 genomic editing technology.CRISPR-Cas9 genomic editing is used to remove the expression of receptor Enhancer Protein-6 (Reep6 p.Leu135Pro ) gene that causes retinitis pigmentosa. Open angle Glaucoma caused by mutations in myocilin (MYOR) gene was effectively removed out by CRISPR-Cas9 editing technology. Mutation in KRT-12 gene that caused Meesman epithelial corneal dystrophy ( MECD) was alleviated by Cas9/sgRNA injection into the stroma of cornea. CRISPR-Cas9 genomic sequencing used in the treatment of Haemophilia -B , an inherited disease caused by mutation of factor IX gene Y371D was successfully modified by CRISPR-
簇状有规律间隔短链重复序列(Clustered Regularly Interspaced Short Palindromic Repeats)被称为CRISPR。细菌的基因组序列重复序列之间有脱氧核糖核酸的 "间隔 "序列,与病毒的基因组序列相似,被发现具有重复的 DNA 序列,称为 CRISPR。基因工程中的 CRISPR 技术为医学领域带来了革命性的变化,它可以治疗各种难以治疗的与基因有关的疾病,如先天性无脑畸形(Lebers Congenital amaurosis),其中线粒体 DNA MT-ND4(NADH ubiquinone oxidoreductase chain4)1178G 基因突变导致双等位基因缺失,通过玻璃体内注射 CRISPR-Cas9 基因组编辑技术产生的 AAV2-ND4 可以治疗这种疾病。CRISPR-Cas9 基因组编辑技术用于去除导致视网膜色素变性的受体增强蛋白-6(Reep6 p.Leu135Pro )基因的表达。利用CRISPR-Cas9基因组编辑技术,有效清除了由肌球蛋白(MYOR)基因突变引起的开角型青光眼。通过将 Cas9/sgRNA 注入角膜基质,缓解了导致梅斯曼上皮性角膜营养不良症(MECD)的 KRT-12 基因突变。CRISPR-Cas9基因组测序技术被用于治疗血友病-B,这是一种由因子IX基因Y371D突变引起的遗传性疾病。
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引用次数: 0
FAULT DETECTION AND DIAGNOSIS BY SUPPORT VECTOR MACHINES: APPLICATION TO VINYL-CHLORIDE-MONOMER PROCESS 支持向量机的故障检测和诊断:在氯乙烯单体工艺中的应用
IF 0.2 Q4 Engineering Pub Date : 2023-12-13 DOI: 10.55766/sujst-2023-03-e03028
C. Panjapornpon, Siriwatida Srirabai
Monitoring process status and identifying process operational faults are essential for improving the process safety in petrochemical plants that interactions between various process streams and units are associated. This paper presents a deployment of a support vector machine technique for detecting and identifying operational fault cases with a case study of a vinyl chloride monomer plant. An integrated simulation environment between MATLAB and UniSim Design dynamic simulator is utilized for evaluating the performance of the proposed fault detection and identification framework. Under the real-time software-in-the-loop simulation, the confusion matrix results and receiver operating characteristics supported that the proposed framework provides high accuracy of fault classification.
监控工艺状态和识别工艺运行故障对于提高石化工厂的工艺安全至关重要,因为各种工艺流和装置之间存在着关联。本文以氯乙烯单体工厂为例,介绍了支持向量机技术在检测和识别操作故障案例中的应用。本文利用 MATLAB 和 UniSim Design 动态模拟器之间的集成模拟环境来评估所提出的故障检测和识别框架的性能。在实时软件在环仿真下,混淆矩阵结果和接收器工作特性证明了所提出的框架具有较高的故障分类准确性。
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引用次数: 0
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Suranaree Journal of Science and Technology
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