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均相和非均相催化微藻脂质提取和酯交换制备生物燃料的研究进展

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Chinese Journal of Catalysis 2024年第4期59卷 97-117页

作者： Vinoth kumar Ponnumsamy Hussein E.Al-Hazmi Sutha Shobana Jeyaprakash Dharmaraja dipak Ashok Jadhav Rajesh Banu J Grzegorz Piechota Bartłomiej Igliński Vinod kumar Amit Bhatnagar Kyu-Jung Chae Gopalakrishnan kumar 高雄医科大学药物与应用化学系环境医学研究中心中国台湾高雄高雄医科大学医学研究部中国台湾高雄格但斯克理工大学土木与环境工程学院波兰纳鲁特维察格但斯克范朗大学工程与技术学院建筑绿色技术与可持续发展研究组越南胡志明市工程技术学院科学与人文系化学部印度泰米尔纳德邦韩国海洋大学海洋科学与工程学院环境工程系韩国釜山泰米尔纳德邦中央大学生命科学系印度泰米尔纳德邦 GPCHEM沼气研究与分析实验室波兰尼古拉斯哥白尼大学化学系波兰克兰菲尔德大学水与能源学院英国拉彭兰塔工业大学工程科学学院分离科学系芬兰韩国海洋大学海洋可再生能源工程专业韩国釜山延世大学土木与环境工程学院韩国首尔斯塔万格大学科学技术学院化学、生物科学与环境工程研究所挪威斯塔万格

随着化石燃料燃烧导致的二氧化碳排放不断加剧气候变化,且化石燃料储量日益减少,寻求可再生能源已成为一项紧迫的任务.其中,藻类衍生可持续燃料因具有成本优势和可运输性,在解决全球能源危机方面展现出广阔前景,备受关注.利用化学转化... 详细信息

随着化石燃料燃烧导致的二氧化碳排放不断加剧气候变化,且化石燃料储量日益减少,寻求可再生能源已成为一项紧迫的任务.其中,藻类衍生可持续燃料因具有成本优势和可运输性,在解决全球能源危机方面展现出广阔前景,备受关注.利用化学转化技术从微藻中提取脂质,并通过酯交换反应可以将其转化为脂肪酸甲酯,是生产绿色生物燃料的有效途径.这一过程涉及游离脂肪酸、磷脂和甘油三酯的提取,并且生产过程能耗低,成为满足日益增长的能源需求的一种理想解决方案.本文综述了微藻脂质提取和酯交换制备生物燃料的相关研究进展.首先,介绍了微藻脂质的提取方法,包括溶剂提取法、索氏提取法、布利格和戴耶法、超临界二氧化碳提取以及离子液体溶剂法等,并分析了各方法的优缺点.随后,重点阐述了酯交换技术在微藻脂质转化中的应用,包括酸碱催化、酶催化以及原位酯交换反应等,并探讨了这些技术的反应机理、催化剂选择、反应器设计以及生物油生产工艺等方面的研究进展.通过综述上述研究进展,为微藻脂质的生产和应用提供了理论指导.研究表明,通过优化催化剂种类、反应条件以及提取方法,可以有效提高微藻脂质的转化效率和生物油品质.同时,本文也指出了当前微藻脂质生产中面临的挑战,如微藻栽培和生长条件优化、高效转化技术的开发等.随着可持续能源日益受到重视,微藻脂质作为一种可再生能源具有巨大的发展潜力.未来研究应进一步关注微藻的规模化栽培、生长条件优化以及高效转化技术的研发,以提高微藻脂质的产量和品质.同时,应进一步推动和实现微藻生物燃料的实际应用,从而为应对气候变化和能源危机提供有效的解决方案.

关键词：微藻脂质提取酯交换催化酶催化原位技术

Microstructure studies of air-plasma-spray-deposited CoNiCrAlY coatings before and after thermal cyclic loading for high-temperature application

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International Journal of Minerals,Metallurgy and Materials 2016年第8期23卷 934-942页

作者： dipak kumar K.N.Pandey dipak kumar Das Mechanical Engineering Department Motilal Nehru National Institute of TechnologyAllahabad-211004India Defense Metallurgical Research Laboratory Hyderabad-500058India

In the present study, bond-coats for thermal barrier coatings were deposited via air plasma spraying（APS） techniques onto Inconel 800 and Hastelloy C-276 alloy substrates. Scanning electron microscopy（SEM）, transmission electron microscopy（TEM）, X-ray diffraction（XRD）, and atomic force microscopy（AFM） were used to investigate the phases and microstructure of the as-sprayed, APS-deposited Co Ni Cr Al Y bond-coatings. The aim of this work was to study the suitability of the bond-coat materials for high temperature applications. Confirmation of nanoscale grains of the γ/γ′-phase was obtained by TEM, high-resolution TEM, and AFM. We concluded that these changes result from the plastic deformation of the bond-coat during the deposition, resulting in Co Ni Cr Al Y bond-coatings with excellent thermal cyclic resistance suitable for use in high-temperature applications. Cyclic oxidative stability was observed to also depend on the underlying metallic alloy substrate.

关键词： thermal barrier coatings coating structure plasma spraying thermal cycle high-temperature applications microstructure studies

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Chinese Physics Letters 2006年第11期23卷 2944-2947页

作者： dipak Ghosh Argha Deb Samabrata Sarkar Prabir kumar Haldar Nuclear and Particle Physics Research Centre Department of Physics Jadavpur University Kolkata-700032 India

The intermittent fluctuation of target evaporated particles is studied in both ring-like and jet-like events emitted in ^32 S-emulsion interactions at 200 A Ge V within the framework of multi-dimensional factorial moment methodology using the concept of the Hurst exponent. It is observed that the intermittent fluctuation in the ring-like event is self-similar, whereas in the jet-like event fluctuation is self-affine. However, study indicates that the strength of fluctuation in the ring-like events is much stronger than that in the jet-like events.

关键词： HIGH-ENERGY MULTIPARTICLE PRODUCTION JET-LIKE INTERMITTENCY DISTRIBUTIONS ANNIHILATION PARTICLES MOMENTS GEV/C

Evidence of Strong Pion Fluctuation in Jet-Like Events in ^32S-AgBr Interactions

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Chinese Physics Letters 2006年第4期23卷 815-818页

作者： dipak Ghosh Argha Deb Prabir kumar Haldar Sima Guptaroy Nuclear and Particle Physics Research Centre Department of Physics Jadavpur University Kolkata-700 032 India

We presents the analysis of ring-like and jet-like events in terms of Scaled Factorial Moments （SFMs） in one dimensional space up to the sixth order of moments for ^32S-AgBr interactions at 200 AGeV energy. The study reveals a power law growth of SFMs with decreasing bin width of the azimuthal distribution in the ^32S- AgBr data at 200 AGeV in both the cases. It is seen that strong intermittent pattern is revealed only in jet-like events.

关键词： Evidence of Strong Interactions

Pronounced Fluctuations of Target Fragments in Forward Hemisphere Only in Ultra Relativistic Nuclear Collision

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Chinese Physics Letters 2006年第6期23卷 1441-1444页

作者： dipak Ghosh Argha Dev Samabrata Sarkar Prabir kumar Haldar Nuclear and Particle Physics Research Centre Department of Physics Jadavpur University Kolkata-700032 India

Dynamical fluctuation of target evaporated black particles is investigated in both forward and backward hemispheres within the framework of multi-dimensional factorial moment methodology using the brilliant concept of the Hurst exponent. We analyse the black particles emitted in ^32S-AgBr interactions at 200AGeV and it is evident that the dynamical fluctuation in the backward hemisphere is self-affine. In the forward hemisphere, dynamical fluctuation is self-similar but not self-affine. However, study indicates that the fluctuation in the forward hemisphere is more pronounced than that in backward hemisphere.

关键词： HEAVY-ION COLLISIONS SELF-AFFINE PHASE-SPACE MULTIPARTICLE PRODUCTION HIGH-ENERGY MULTIPLICITY FLUCTUATION HADRON COLLISIONS COLLECTIVE-FLOW INTERMITTENCY

Model for mucus transport in the airways due to air motion： Effect of slipperiness

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International Journal of Biomathematics 2016年第5期9卷 171-183页

作者： dipak kumar Satpathi Kota Venkata Ratnamt Adepalli Ramu Department of Mathematics Birla Institute of Technology and Science Pilani Hyderabad Campus Jawahar Nagar Shameerpet Rangaveddy District 500078 India

In this paper, a circular three-layer flow model is proposed to study mucus transport in the airways due to air motion caused by mild forced expiration or mild coughing. Mucus is represented by four-parameter viscoelastic fluid, a combination of Maxwell and Voigt elements, whereas air and serous fluid are taken as Newtonian fluids （incompressible）. The pressure gradient generated in the fluid layers is assumed to be given by a time- dependent function representing mild forced expiration or mild cough in the airways causing laminar flow. The effect of slip velocity at the mucus-serous interface caused by the presence of surfactant and at the top surface caused by immotile cilia are Mso taken into account. The roles of rheological properties of mucus on its transport are studied. The effect of serous fluid and its viscosity on mucus transport is also considered.

关键词： Viscoelastic Maxwell fluid mucus serous layer surfactant

Fire monitoring in coal mines using wireless underground sensor network and interval type-2 fuzzy logic controller

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International Journal of Coal Science & Technology 2019年第2期6卷 274-285页

作者： Sweta Basu Sutapa Pramanik Sanghamitra Dey Gautam Panigrahi dipak kumar Jana Prajnanananda Insitute of Technology & Management 94/2 Park Street Koi-17 Park Circus 7th point Kolkata WB 700 017 India Deulia Balika Vidyamandir Kolaghat 721154 India Department of Mathematics NIT Durgapur WB India Department of Applied Science Haldia Institute of Technology Haldia Purba Midnapur WB 721657 India

From the view of underground coal mining safety system, it is extremely important to continuous monitoring of coal mines for the prompt detection of fires or related problems inspite of its uncertainty and imprecise characteristics. Therefore, evaluation and inferring the data perfectly to prevent fire related accidental risk in underground coal mining (UMC) system are very necessary. In the present article, we have proposed a novel type-2 fuzzy logic system (T2FLS) for the prediction of fire intensity and its risk assessment for risk reduction in an underground coal mine. Recently, for the observation of underground coal mines, wireless underground sensor network (WUSN) are being concerned frequently. To implement this technique IT2FLS, main functional components are sensor nodes which are installed in coal mines to accumulate different imprecise environmental data like, temperature, relative humidity, different gas concentrations etc. and these are sent to a base station which is connected to the ground observation system through network. In the present context, a WUSN based fire monitoring system is developed using fuzzy logic approach to enhance the consistency in decision making system to improve the risk chances of fire during coal mining. We have taken Mamdani IT2FLS as fuzzy model on coal mine monitoring data to consider real-time decision making (DM). It is predicted from the simulated results that the recommended system is highly acceptable and amenable in the case of fire hazard safety with compared to the wired and off-line monitoring system for UMC. Legitimacy of the suggested model is prepared using statistical analysis and multiple linear regression analysis.

关键词： Type-2 fuzzy logic Underground coal mining system Mine environment Fire and risk monitoring of mine Wireless sensor networks Fire Intensity

Finite-size-effect on a very large length scale in NBT-based lead-free piezoelectrics

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Journal of Advanced Dielectrics 2019年第5期9卷 35-41页

作者： Anupam Mishra dipak kumar Khatua Gobinda Das Adhikary Naveen kumar Uma Shankar Rajeev Ranjany Department of Materials Engineering Indian Institute of Science Bangalore-560012 India

Na_(0.5)Bi_(0.5)TiO_(3)-based lead-free piezoelectrics are considered for potential replacement of the lead-based commercial piezoceramics in high-power transducer *** have examined the role of grain size in influencing the structural-polar inhomogeneity of stoichiometric and off-stoichiometric Na_(0.5)Bi_(0.5)TiO_(3)(NBT),and its morphotropic-phase-boundary(MPB)derivative 0.94Na_(0.5)Bi_(0.5)TiO_(3)-0.06BaTiO_(3)(NBT-6BT).Our study reveals that size effect comes into play in these systems on a very large length scale(on the scale of microns)considerably affecting its global structure and properties.

关键词： Lead-free piezoelectrics Na_(0.5)Bi_(0.5)TiO_(3) size effect crystal structure depolarization temperature

Use of Medicinal Plant and Its Vulnerability Due to Climate Change in Northern Part of Bangladesh

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American Journal of Plant Sciences 2016年第13期7卷 1782-1793页

作者： Sadhan kumar Roy dipak kumar Roy Department of Geography and Environmental Science Faculty of Life and Earth Sciences Begum Rokeya University Rangpur Bangladesh Department of Public Health School of Health & Life Sciences North South University Dhaka Bangladesh

Medicinal plants are playing an important role to human livelihood. Bangladesh is well recognized of medicinal plants wealth as unique and globally rich. The studies demonstrate about the value of traditional systems of medicine as economically useful plants and possible effects of climate change on medicinal plants. It is true that climate change is causing noticeable effects on life cycles and distribution of the plant species. However, climate change effects on medicinal plants are widely unclear in Bangladesh. At present, a huge number of populations in Bangladesh are directly dependent on the healthcare treatment by medicinal plants that is why it is an emerging concern in Bangladesh. It is a crying need to improve our understanding the effects on medicinal plants by various researches is stressed in the present article. To know the present condition of medicinal plants and effects of climate change on medicinal plants in northern part of Bangladesh an attempt is being taken here. The study also added the optimum use of medicinal plants and their conservation in northern part of Bangladesh.

关键词： Climate Change Drought Medicinal Plants Conservation