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Friction and wear characteristics of robust carbon–carbon composites developed solely from petroleum pitch without reimpregnation

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Friction 2020年第5期8卷 945-956页

作者： Shishobhan SHARMA Bharat patel Rasmika patel Department of Materials Science Sardar Patel UniversityVallabh VidyanagarAnandGujarat 380012India Kana Advanced Composites Industry PORVadodaraGujarat 380012India

Friction and wear characteristics correlating the fiber reinforcement percentage of carbon–carbon (C/C) composites solely developed from petroleum pitch matrices were investigated. This study exhibits the tribo-characteristics of C/C composites developed in a single-step carbonization process for varying loads for the first time without a reimpregnation process. A pin-on-disc tribometer with a sliding speed of 0.5 m/s and loads of 5, 10, and 20 N with a flat tool grade stainless steel pin as a static partner was employed. Further, polarized light optical and scanning electron microscopes (SEM) were utilized for a morphological analysis. Elastic modulus and strength were determined by a compression test. A result analysis is conducted to analyze sliding wear accompanied with minor abrasion. The composites with a high percentage of reinforcement exhibit credible wear resistance and mechanical robustness.

关键词： carbon sliding wear microstructure composite friction pitch characterization

Role of inter-particle collision on solids acceleration in riser

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Particuology 2010年第1期8卷 13-18页

作者： Rajesh patel Department of Mechanical Engineering New Jersey Institute of Technology

Collision among particles plays a significant role in governing the structure of gas-solids flow in a riser, especially in the dense and acceleration region. The inter-particle collision is the major cause not only for the kinetic energy dissipation （in terms of additional pressure drop beyond the solids hold-up） but also for the control of solids acceleration （in terms of a balancing force to prevent a free acceleration of solids）. A neglect of the balancing force of inter-particle collision against the hydrodynamic force in the solids momentum equation would simply overestimate the solids acceleration or concentration while underestimate the axial gradient of pressure along the riser by a large margin, typically by up to two orders of magnitude. This paper aims to illustrate the importance of the collision on the characteristic of the gas-solids riser flow. Our analysis shows that the collision force should be of the same order of magnitude as that of the drag force in the dense and acceleration region, which can be far beyond that of gravitational force on solids. A simple formulation of the collision force is therefore proposed to bear a similar format of drag force, with regard to the dependence upon local solids *** the inclusion of the proposed correlation of collision force in the solids momentum equation, our model would be able to yield reasonable phase distributions of gas-solid flows, which can be validated, in a bulk range, against available measurements of solids volume fraction and axial gradient of pressure.

关键词： Gas-solids flow Fluidization Solid acceleration Energy dissipation

Bio-Nanocarriers for Lung Cancer Management:Befriending the Barriers

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Nano-Micro Letters 2021年第9期13卷 238-291页

作者： Shruti Rawal Mayur patel Department of Pharmaceutics Institute of PharmacyNirma UniversitySG HighwayChharodiAhmedabadGujarat 382481India

ABSTRACT Lung cancer is a complex thoracic malignancy developing consequential to aberrations in a myriad of molecular and biomolecular signaling *** is one of the most lethal forms of cancers accounting to almost 1.8 million new annual incidences,bearing overall mortality to incidence ratio of *** dismal prognostic scenario at advanced stages of the disease and metastatic/resistant tumor cell populations stresses the requisite of advanced translational interdisciplinary interventions such as *** review article deliberates insights and apprehensions on the recent prologue of nanobioengineering and bionanotechnology as an approach for the clinical management of lung *** role of nanobioengineered(bio-nano)tools like bio-nanocarriers and nanobiodevices in secondary prophylaxis,diagnosis,therapeutics,and theranostics for lung cancer management has been ***,bioinspired,and biomimetic bio-nanotools of considerate translational value have been *** on existent oncostrategies,their critical comparison with bio-nanocarriers,and issues hampering their clinical bench side to bed transformation have also been summarized.

关键词： Biomimetic nanoparticles Exosomes Circulating tumor cells Mesenchymal stem cells Theranostics

Renewable hydrogen production from butanol:a review

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Clean Energy 2017年第1期1卷 90-101页

作者： Ronak patel Sanjay patel Chemical Engineering Department Institute of TechnologyNirma UniversityAhmedabadGujarat 382481India Chemical Engineering Department L.D.College of EngineeringAhmedabadGujarat 380015India

Hydrogen production from butanol is a promising alternative when it is obtained from bio-butanol or bio-oil due to the higher hydrogen content compared to other oxygenates such as methanol,ethanol or *** and operating conditions play a crucial role in hydrogen *** and Rh are metals mainly used for butanol steam reforming,oxidative steam reforming and partial *** such as Cu can improve catalytic activity in many ***,support-metal interaction and catalyst preparation technique also play a decisive role in the stability and hydrogen production capacity of *** reforming technique as an option is more frequently researched due to higher hydrogen production capability in comparison to other thermochemical techniques despite its endothermic *** use of the oxidative steam reforming and partial oxidation has the advantages of requiring less energy and longer stability of ***,the hydrogen yield is *** article brings together and examines the latest research on hydrogen production from butanol via steam reforming,oxidative steam reforming and partial oxidation *** addition,the review examines a few thermodynamic studies based on sorption-enhanced steam reforming and dry reforming where there is potential for hydrogen extraction.

关键词： butanol hydrogen production steam reforming oxidative steam reforming partial oxidation

Recent development in upconversion nanoparticles and their application in optogenetics:A review

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Journal of Rare Earths 2022年第6期40卷 847-861,I0001页

作者： Madhumita patel Maninder Meenu Jitender Kumar Pandey Pawan Kumar Rajkumar patel Department of Chemistry and Nano Science Ewha Womans UniversitySeodaemun-guSeoul120-750South Korea College of Biosystems Engineering and Food Science Zhejiang UniversityHangzhou 310058China School of Basic and Applied Sciences Adamas UniversityKolkata700126India Institut National de la Recherche Scientifique-Centreénergie Materiaux Télecommunications(INRS-EMT) VarennesQCCanada Department of Chemistry and Biochemistry University of Oklahoma101 Stephenson ParkwayNormanOK73019United States Energy&Environmental Science and Engineering(EESE) Integrated Science and Engineering Division(ISED)Underwood International CollegeYonsei University85 Songdogwahak-roYeonsu-guIncheon21983South Korea

Ion channels present in the plasma membrane are responsible for integration and propagation of electric signals,which transmit information in nerve *** of these ion channels leads to many neurological ***,optogenetic technology has gained a lot of attention for the manipulation of neuronal *** is a neuromodulation approach that has been developed to control neuronal functions and activities using *** lanthanide-doped upconversion nanoparticles(UCNPs)absorb low energy photons in near-infrared(NIR) window and emit high energy photons in the visible spectrum region via nonlinear *** the last few decades,UCNPs have gained great attention in various bio-medical applications such as bio-imaging,drug delivery and *** near-infrared illumination is considered more suitable for optogenetics application,due to its lower degree of light attenuation and higher tissue penetration compared to visible ***,UCNPs have been considered as the new promising candidates for optogenetics *** nanoparticlemediated optogenetic systems provide a great opportunity to manipulate the ion channel in deep ***,we summarize the upconversion photoluminescence in lanthanide doped nanomaterials and its mechanisms and several approaches adopted to tune emission color or enhance upconversion *** advances of lanthanide-doped UCNPs design strategy and their mechanism are ***,we discuss the neural circuitry modulation using upconversion nanoparticles mediated ***,the future perspectives towards optogenetics are also included.

关键词： Lanthanide Upconversion Optogenetics Nanoparticles Neuronal modulation Rare earths

The Impingement Heat Transfer Data of Inclined Jet in Cooling Applications: A Review

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Journal of Thermal Science 2020年第1期29卷 1-12页

作者： PAWAR Shashikant patel Devendra Kumar SMEC Vellore Institute of Technology

On the impingement heat transfer data,the experimental studies of air and liquid jets impingement to the flat surfaces were collected and critically *** oblique impingements of both single circular and planar slot jets were considered in *** review focused on the surface where the jet impingement cooling technique was *** nozzle exit Reynolds numbers based on the hydraulic diameter varied in the range of 1,500–52,*** oblique angles relative to the plane surface and the dimensionless jet-to-plate spacing vary in the range of 15°–90°and 2–12 *** review suggested that the magnitude of maximum heat transfer shifted more for air jets compared with the liquid *** drop in the inclination angle and the jet-to-plate separation led to the increase in the asymmetry of heat transfer *** displacement of maximum Nusselt number(heat transfer)locations was found to be sensitive to the inclination angle and the smaller jet-to-plate ***,the Nusselt number correlations proposed by various researchers were discussed and compared with the results of the cited references.

关键词： heat and fluid flow jet impingement Nusselt number oblique angle

Tsunami wave propagation model:A fractional approach

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Journal of Ocean Engineering and Science 2022年第6期7卷 509-520页

作者： Priti Tandel Hardik patel Trushit patel Department of Mathematics Veer Narmad South Gujarat UniversitySuratGujaratIndia Department of Mathematics Uka Tarsadia UniversityBardoliGujaratIndia Department of Mathematics Veermata Jijabai Technological InstituteMumbaiIndia

This paper presents a fractional approach to study the mathematical model of tsunami wave propagation along a coastline of an *** Reduced Differential Transform Method(FRDTM)is used to analyze this *** present model has been studied on the shallow-water *** is represented by a time-fractional coupled system of non-linear partial differential *** to the proposed model for different coastal slopes and ocean depths have been *** of coast slope and sea depth variations on tsunami wave velocity and wave amplification have been demonstrated at different time levels and different ordersα.The obtained results are compared with Elzaki Adomian Decomposition Method(EADM)to validate the proposed method for an orderα=1.

关键词： Tsunami wave Shallow water Time-fractional coupled system of partial differential equations Fractional reduced differential transform method(FRDTM)

A Review on Pharmacological and Analytical Aspects of Naringenin

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Chinese Journal of Integrative Medicine 2018年第7期24卷 551-560页

作者： Kanika patel Gireesh Kumar Singh Dinesh Kumar patel G.L.A Institute of Pharmaceutical Research MathuraIndia Department of Pharmaceutics Institute of TechnologyBanaras Hindu UniversityVaranasi-221005India

Flavonoids are a widely distributed group of phytochemicals having benzo-pyrone nucleus, and more than 4,000 different flavonoids have been described and categorized into flavonols, flavones, flavanones, isoflavones, catechins and anthocyanidins. Flavonoids occurs naturally in fruits, vegetables, nuts, and beverages such as coffee, tea, and red wine, as well as in medical herbs. Flavonoids are responsible for the different colors of plant parts and are important constituents of the human diet. Flavanoids have different pharmacological activities, such as antioxidant, anti-allergic, antibacterial, anti-inflammatory, antimutagenic and anticancer activity. Naringenin belongs to the flavanones and is mainly found in fruits（grapefruit and oranges） and vegetables. Pharmacologically, it has anticancer, antimutagenic, anti-inflammatory, antioxidant, antiproliferative and antiatherogenic activities. Naringenin is used for the treatments of osteoporosis, cancer and cardiovascular diseases, and showed lipid-lowering and insulin-like properties. In the present review, detailed pharmacological and analytical aspects of naringenin have been presented, which revealed the impressive pharmacological profile and the possible usefulness in the treatment of different types of diseases in the future. The information provided in this communication will act as an important source for development of effective medicines for the treatment of various disorders.

关键词： analytical techniques flavonoids naringenin pharmacological activity phytoconstituents

An efficient technique for solving fractional-order diffusion equations arising in oil pollution

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Journal of Ocean Engineering and Science 2023年第3期8卷 217-225页

作者： Hardik patel Trushit patel Dhiren Pandit Department of Mathematics Uka Tarsadia UniversityBardoliGujaratIndia Computer Science University of the PeoplePasadenaCA 91101United States Department of Mathematics and Humanities Nirma UniversityAhmedabadIndia

In this article,non-linear time-fractional diffusion equations are considered to describe oil pollution in the *** latest technique,fractional reduced differential transform method(FRDTM),is used to ac-quire approximate solutions of the time fractional-order diffusion equation and two cases of Allen-Cahn *** acquired results are collated with the exact solutions and other results from literature for integer-orderα,which reveal that the proposed method is ***,FRDTM can be employed to obtain solutions for different types of nonlinear fractional-order IVPs arising in engineering and science.

关键词： FRDTM Time-fractional nonlinear partial differential equation Diffusion equation Allen-Cahn(AC)equation Parabolic equations