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CaTiO_(3) nano ceramic for NTCR thermistor based sensor application

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Journal of Advanced Ceramics 2014年第2期3卷 117-124页

作者： subhanarayan sAHOO s.K.s.parashar s.M.ALI school of Electrical Engineering KIIT UniversityBhubaneswar-751024India Department of Electrical and Electronics Engineering Trident Academy of TechnologyBhubaneswar-751024India school of Applied sciences KIIT UniversityBhubaneswar-751024India

It is possible to fabricate highly sensitive NTCR(negative temperature coefficient of resistance)thermistor using nano crystalline CaTiO_(3) synthesized by high energy ball *** shaped green pellets were prepared and effects of sintering on the disc pellets were studied as thermistor by sintering the samples at 1000℃,1100℃and 1200℃.The as-prepared samples were characterized by X-ray diffraction(XRD),impedance analysis and electrical *** resistivity of the prepared samples varies predictably with temperature:this makes them promising material for temperature *** experimental results prove that nano crystalline CaTiO_(3) ceramic is one kind of thermistor with exponential negative temperature coefficient of resistance in the temperature range of 300-500℃.The samples have the advantages of rapid response,high sensitivity and capability to withstand thermal surges over the temperature range of 300-500℃.Resistance-temperature characteristics are described by thermistor equation with thermistor constant around 4003 K to 10795 K and thermal coefficient of resistanceαaround-1%/℃to-13%/℃.The activation energy is in the range of 0.34-0.93 *** observed thermistor parameters are found to be comparable with many of the known thermistor *** suggests that the electrical properties can be adjusted to desirable values by controlling the temperature *** influence of fabrication process of disc thermistor and electrical properties are *** study shows the potential of nano crystalline CaTiO_(3) to act as an NTCR material for thermistor applications.

关键词： CaTiO_(3) thermistor sensitivity index temperature coefficient

Effect of Li^(+)ion mobility on the grain boundary conductivity of Li_(2)TiO_(3) nanoceramics

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Journal of Advanced Ceramics 2014年第2期3卷 98-108页

作者： Umasankar DAsH subhanarayan sAHOO s.K.s.parashar Paritosh CHAUDHURI school of Applied sciences KIIT University Bhubaneswar-751024India Department of Electrical and Electronics Engineering Trident Academy of TechnologyBhubaneswar-751024India Institute for Plasma Research BhatGandhinagarGujurat-382428India

Lithium titanate(Li_(2)TiO_(3))is one of the most promising candidates among the tritium breeding materials because of its good tritium release *** concentration has much significance on the diffusivity of tritium in the *** nanocrystalline single-phase Li_(2)TiO_(3) with monoclinic structure has been prepared by high energy ball milling followed by calcination at 700℃for 2 *** field emission scanning electron microscopy(FEsEM)studies confirmed uniform distribution of nanocrystalline phase with particle size below 100 *** study of the Li^(+)ion diffusion on the sintered sample was investigated by means of electrical conductivity *** properties of the samples were studied in wide temperature(50-500℃)and frequency(100 Hz-1 MHz)*** complex impedance spectroscopy(CIs)studies showed the presence of both bulk and grain boundary effects in nanocrystalline Li_(2)TiO_(3).The bulk resistance of the samples has been observed to decrease with rise in temperature showing a typical negative temperature coefficient of resistance(NTCR)*** low activation energies of the samples suggested the presence of singly ionized oxygen vacancies in the conduction *** hopping frequency shifted toward higher frequency with increase in *** energy of 0.86 eV was calculated from AC conductivity.

关键词： high energy ball milling AC conductivity impedance spectroscopy nanocrystalline

Frequency and temperature dependent electrical characteristics of CaTiO_(3) nano-ceramic prepared by high-energy ball milling

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Journal of Advanced Ceramics 2013年第3期2卷 291-300页

作者： subhanarayan sAHOO Umasankar DAsH s.K.s.parashar s.M.ALI school of Electrical Engineering KIIT UniversityBhubaneswar 751024India Center for Nanotechnology KIIT UniversityBhubaneswar 751024India school of Applied sciences KIIT UniversityBhubaneswar 751024India

Nanocrystalline calcium titanate(CT)ceramic has been synthesized by a combination of solid-state reaction and high-energy ball *** nano-ceramic is characterized by X-ray diffraction(XRD),dielectric study and impedance *** XRD pattern shows single phase ceramic of orthorhombic *** frequency-dependent dielectric study shows that the dielectric constant is maximized at low frequencies and decreases with an increase in *** spectroscopy analyses reveal a non-Debye type relaxation phenomenon.A significant shift in impedance loss peaks toward the higher-frequency side indicates conduction in the material favoring the long-range motion of mobile charge *** grain conduction effect is observed from the complex impedance spectrum by the appearance of one semicircular arc in Nyquist *** is also observed that the resistance decreases with an increase in temperature showing a negative temperature coefficient of resistance(NTCR).Various thermistor parameters have been calculated by fitting with steinhart-Hart *** modulus plots represent the presence of temperature-dependent electrical relaxation phenomenon with the *** frequency-dependent AC conductivity at different temperatures indicates that the conduction process is thermally *** activation energy has been calculated from an Arrhenius plot of DC conductivity and relaxation frequency.

关键词： high-energy ball milling dielectric study impedance spectroscopy thermistor conductivity

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热障涂层对非道路用柴油机性能和排放的影响

汽车与新动力 2016年第1期48卷 32-36页

作者： M.A.Quazi s.parashar 张然治

一方面,内燃机的性能应随着某些技术要求和燃料费用的快速提高而有所改善。另一方面,由于使用替代燃料和环境的要求,也迫使人们改进发动机使用的材料。因此,发动机材料的性能变得越来越重要。业内对引入热障涂层(TBC)的隔热柴油机的试... 详细信息

一方面,内燃机的性能应随着某些技术要求和燃料费用的快速提高而有所改善。另一方面,由于使用替代燃料和环境的要求,也迫使人们改进发动机使用的材料。因此,发动机材料的性能变得越来越重要。业内对引入热障涂层(TBC)的隔热柴油机的试验研究产生了一些争议。有些报道称,发动机效率会随着隔热有所提高,而另一些报道的结论则为之相反,也有报道给出了喜忧参半的结论。对基本型发动机和隔热(活塞顶采用等离子喷涂法涂覆氧化锆涂层)柴油机放热情况进行的比较分析。涂层系统会影响到燃油消耗率、功率、燃烧效率、污染物含量和发动机零部件的疲劳寿命。采用等离子体热喷涂法在燃烧室,包括活塞、气缸盖、气缸体、进气门和排气门上涂覆陶瓷层,通常会产生一些有利的影响。采用涂层系统时也存在一些缺点,例如会产生氮氧化物。基于试验结果,对热障涂层的所有优点和缺点进行了研究。同时,还给出了效率损失原因的解释。用1台在活塞、气门、气缸盖和气缸套上涂覆0.5mm厚的压电陶瓷(PZT)和氰酸盐改性环氧树脂的3缸柴油机,在不同负荷工况下进行了试验研究。结果表明燃油消耗率有所降低。未燃碳氢化合物和一氧化碳的排放量减少,而氮氧化物排放增加。

关键词：热障涂层排放陶瓷涂层

抑郁治疗和急性心肌梗死后1年死亡率的相关性:TRIUMPH注册研究

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中华高血压杂志 2017年第2期25卷 140-140页

作者：刘莉叶鹏 smolderen KG Buchanan DM Gosch K Whooley MA Chan Ps Vaccarino V parashar s shah AJ Ho PM spertus JA

在急性心肌梗死（acute myocardial infarction,AMI）患者中,抑郁症是很普遍的,并且与不良的生活质量和预后相关。尽管一些国家组织提出了筛选抑郁症的建议,但尚不清楚AMI患者的抗抑郁治疗是否与更好的预后相关。该研究的目的是确定接... 详细信息

在急性心肌梗死（acute myocardial infarction,AMI）患者中,抑郁症是很普遍的,并且与不良的生活质量和预后相关。尽管一些国家组织提出了筛选抑郁症的建议,但尚不清楚AMI患者的抗抑郁治疗是否与更好的预后相关。该研究的目的是确定接受抗抑郁治疗是否对患者的预后有影响。方法：

关键词：急性心肌梗死后抗抑郁治疗抑郁症年死亡率相关性 AMI患者注册预后相关

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氮肥水平和施用时间对第一年宿根蔗影响的研究

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甘蔗糖业 1988年第4期 45-45页

作者： K.s.parashar Arjun Prasad 陈渐佳

宿根蔗需肥比新植蔗多得多(Bhoj1962,Chui和samuele 1977)。在阿讷加伯莱的研究表明,每生产一吨新植蔗需氮0.97公斤,而生产一吨宿根蔗则几乎是它的2倍,即1.98公斤(Lakshmikantam,1973)。有关第一年宿根蔗施氮水平和施肥时间效果的报道很... 详细信息

宿根蔗需肥比新植蔗多得多(Bhoj1962,Chui和samuele 1977)。在阿讷加伯莱的研究表明,每生产一吨新植蔗需氮0.97公斤,而生产一吨宿根蔗则几乎是它的2倍,即1.98公斤(Lakshmikantam,1973)。有关第一年宿根蔗施氮水平和施肥时间效果的报道很少,故进行本研究。1983年,在新德里印度农业研究所进行田间试验,试验区的土壤质地是沙壤土(沙占62.5%、淤泥20.3%和粘士17.2%),弱碱性(pH 7.8),有机碳和全氮量分别为0.45%和0.035%。试验设计为:4种施氮

关键词：宿根蔗新植蔗蔗汁第一年

Obtaining Crisp Priorities for Triangular and Trapezoidal Fuzzy Judgments

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Computer systems science & Engineering 2022年第4期41卷 157-170页

作者： Raman Kumar Goyal Jaskirat singh Nidhi Kalra Anshu parashar Gagan singla sakshi Kaushal Computer science and Engineering Department Thapar Institute of Engineering and TechnologyPatialaPunjabIndia Computer science and Engineering University Institute of Engineering and TechnologyPanjab UniversityChandigarhIndia

This paper proposes anoptimal fuzzy-based model for obtaining crisp priorities for Fuzzy-AHP comparison *** judgments cannot be given for real-life situations,as most of these include some level of fuzziness and *** these situations,judgments are represented by the set of fuzzy *** of the fuzzy optimization models derive crisp priorities for judgments repre-sented with Triangular Fuzzy Numbers(TFNs)*** do not work for other types of Triangular shaped Fuzzy Numbers(TsFNs)and Trapezoidal Fuzzy Numbers(TrFNs).To overcome this problem,a sum of squared error(ssE)based optimization model is *** some other methods,the proposed model derives crisp weights from all of the above-mentioned fuzzy judgments.A fuzzy number is simulated using the Monte Carlo method.A threshold-based constraint is also applied to minimize the deviation from the initial *** Algorithm(GA)is used to solve the optimization *** have also conducted casestudiesto show the proposed approach’s advantages over the *** show that the proposed model outperforms other models to minimize ssE and deviation from initial ***,the proposed model can be applied in various real time scenarios as it can reduce the ssE value upto 29%compared to the existing studies.

关键词： Analytic hierarchy process comparison matrices priority vectors fuzzy judgments triangular fuzzy numbers triangular-shaped fuzzy numbers trapezoidal fuzzy numbers

Autism spectrum Disorder Prediction by an Explainable Deep Learning Approach

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Computers, Materials & Continua 2022年第4期71卷 1459-1471页

作者： Anupam Garg Anshu parashar Dipto Barman sahil Jain Divya singhal Mehedi Masud Mohamed Abouhawwash Computer science and Engineering Department Thapar Institute of Engineering and TechnologyPatialaIndia school of Computer science and statistics Trinity College DublinDublinIreland University Institute of Biotechnology Chandigarh UniversityMohaliIndia Department of Computer science College of Computers and Information TechnologyTaif UniversityTaif21944Saudi Arabia Department of Mathematics Faculty of ScienceMansoura UniversityMansoura35516Egypt Department of Computational Mathematics Scienceand Engineering(CMSE)Michigan State UniversityEast LansingMI48824USA

Autism spectrum Disorder (AsD) is a developmental disorderwhose symptoms become noticeable in early years of the age though it canbe present in any age group. AsD is a mental disorder which affects the communicational, social and non-verbal behaviors. It cannot be cured completelybut can be reduced if detected early. An early diagnosis is hampered by thevariation and severity of AsD symptoms as well as having symptoms commonly seen in other mental disorders as well. Nowadays, with the emergenceof deep learning approaches in various fields, medical experts can be assistedin early diagnosis of AsD. It is very difficult for a practitioner to identifyand concentrate on the major feature’s leading to the accurate prediction ofthe AsD and this arises the need for having an automated approach. Also,presence of different symptoms of AsD traits amongst toddlers directs tothe creation of a large feature dataset. In this study, we propose a hybridapproach comprising of both, deep learning and Explainable Artificial Intelligence (XAI) to find the most contributing features for the early and preciseprediction of AsD. The proposed framework gives more accurate predictionalong with the recommendations of predicted results which will be a vital aidclinically for better and early prediction of AsD traits amongst toddlers.

关键词： Deep learning explainable artificial intelligence autism spectrum disorder machine learning

A sEQUENCE sPACE DEFINED BY ORLICZ FUNCTIONs

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Approximation Theory and Its Applications 2002年第4期18卷 70-75页

作者： B.Choudhary s.D.parashar University of Zambia University of Delhi Zambia India

In this paper we define a sequence space using Orlicz functions. We give certain properties and inclusion relations between known sequence spaces and new sequence space.

关键词： A sEQUENCE sPACE DEFINED BY ORLICZ FUNCTIONs

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