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Computer simulation of Cu:AlOOH/water in a microchannel heat sink using a porous media technique and solved by numerical analysis AGM and FEM

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Theoretical & Applied Mechanics Letters 2023年第3期13卷 177-187页

作者： S.A.Abdollahi p.Jalili B.Jalili H.Nourozpour Y.Safari p.pasha D.D.Ganji Master student-Mechanical Engineering-Energy conversion Faculty of Mechanical EngineeringTabriz UniversityTabrizIran Engineering Faculty of EngineeringNorth Tehran BranchIslamic Azad UniversityTehranIran Department of Mechanical Engineering Noshirvani University of TechnologyBabolIran Department of Mechanical engineering Mazandaran University of science and TechnologyBabolIran

Extensive improvements in small-scale thermal systems in electronic circuits,automotive industries,and microcomputers conduct the study of microsystems as *** and thermic field characteristics of the coherent nanofluid-guided microchannel heat sink are described in this *** porous media approximate was used to search the heat distribution in the expanded sheet and Cu:γ-AlOOH/water.A hybrid blend of Boehme copper and aluminum nanoparticles is evaluated to have a cooling effect on the microchannel heat *** using Akbari Ganji and finite element methods,linear and non-linear differential equations as well as simple dimensionless equations have been *** purpose of this study is to investigate the fluid and thermal parameters of copper hybrid solution added to water,such as Nusselt number and Darcy number so that we can reach the best cooling of the ***,by installing a piece of fin on the wall of the heat sink,the coefficient of conductive heat transfer and displacement heat transfer with the surrounding air fluid increases,and the efficiency of the system *** overall results show that expanding values on the Np(series heat transfer fluid system maximizes performance with temperatures)volume division of copper,as well as boehmite alumina particles,lead to a decrease within the stream velocity of the Cu:AlOOH/*** the volume fraction of nanoparticles in the hybrid mixture decreases the temperature of the solid surface and the hybrid *** Brownian movement improves as the volume percentage of nanoparticles in the hybrid mixture grows,spreading the heat across the *** a result,heat transmission rates *** the Darcy number increases,the thermal field for solid sections and Cu:AlOOH/water improves.

关键词： Finite element method AGM method Microchannel Heat sink porous media Cu:γ-AlOOH/water

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Immune consequences of exercise in hypoxia:A narrative review

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Journal of Sport and Health Science 2024年第3期13卷 297-310,I0002页

作者： Johannes Burtscher Qadar pasha Neha Chanana Gregoire p.Millet Martin Burtscher Barbara Strasser Institute of Sport Sciences University of LausanneLausanne 1015Switzerland Institute of Hypoxia Research New Delhi 110067India Department of Biochemistry Jamia HamdardNew Delhi 110062India Department of Sport Science University of InnsbruckInnsbruck 6020Austria Faculty of Medicine Sigmund Freud Private UniversityVienna 1020Austria Ludwig Boltzmann Institute for Rehabilitation Research Vienna 1100Austria

Immune outcomes are key mediators of many health benefits of exercise and are determined by exercise type,dose(frequency/duration,intensity),and individual ***,reduced availability of ambient oxygen(hypoxia)modulates immune functions depending on the hypoxic dose and the individual capacity to respond to *** combined exercise and hypoxia(e.g.,high-altitude training)sculpts immune responses is not well understood,although such combinations are becoming increasingly ***,in this paper,we summarize the impact on immune responses of exercise and of hypoxia,both independently and together,with a focus on specialized cells in the innate and adaptive immune *** review the regulation of the immune system by tissue oxygen levels and the overlapping and distinct immune responses related to exercise and hypoxia,then we discuss how they may be modulated by nutritional ***,antioxidant,and anti-inflammatory mechanisms underlie many of the adaptations that can lead to improved cellular metabolism,resilience,and overall immune functions by regulating the survival,differentiation,activation,and migration of immune *** review shows that exercise and hypoxia can impair or complement/synergize with each other while regulating immune system *** acclimatization,training,and nutritional strategies can be used to avoid risks and tap into the synergistic potentials of the poorly studied immune consequences of exercising in a hypoxic state.

关键词： Altitude Exercise Hypoxia Immune response Training

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Development of a Side Door Composite Impact Beam for the Automotive Industry

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Open Journal of Composite Materials 2024年第1期14卷 1-14页

作者： Vinay papaiya Jens Schuster Yousuf pasha Shaik Department of Applied Logistics and polymer Sciences University of Applied Sciences Kaiserslautern Institute for Plastics and Engineering West Pfalz (IKW) Pirmasens Germany

The automobile industry has been searching for vehicles that use less energy and emit fewer pollutants, which has resulted in a high demand for fuel-efficient vehicles. Because of their higher strength-to-weight ratio compared to traditional steel, using fiber-reinforcement composite materials in automobile bodies has emerged as the most effective strategy for improving fuel efficiency while maintaining safety standards. This research paper examined the utilization of fiber-reinforced composite materials in car bodies to meet the increasing consumer demand for fuel-efficient and eco-friendly vehicles. It particularly focused on a carbon-aramid fiber-reinforced composite impact beam for passenger car side door impact protection. Despite the encouraging prospects of the carbon-aramid fiber-reinforced beam, the research uncovered substantial defects in the fabrication process, resulting in diminished load-bearing capacity and energy absorption. As a result, the beam was un-successful in three-point bending tests. This was accomplished by using an I cross-section design with varying thickness because of the higher area moment of inertia. Vacuum-assisted resin transfer molding (VARTM) manufacturing process was used and the finished beam underwent to three-point bending tests.

关键词： Side-Door Impact Beam Impact Energy Absorption Carbon-Aramid Reinforcement VARTM

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Enhancing Stress Intensity Factor Reduction in Cracks Originating from a Circular Hole in a Rectangular plate under Uniaxial Stress through piezoelectric Actuation

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Materials Sciences and Applications 2024年第1期15卷 1-14页

作者： Gopi Krishna Konda Jens Schuster Yousuf pasha Shaik Department of Applied Logistics and polymer Sciences University of Applied Sciences Kaiserslautern Institute for Plastics Engineering West Pfalz (IKW) Pirmasens Germany

Circular holes are commonly employed in engineering designs;however, they often serve as locations where cracks initiate and propagate. This paper explores a novel approach to structural repair by utilizing piezoelectric actuators. The primary focus of this study is to investigate the influence of an adhesively bonded piezoelectric actuator patch placed above a circular hole on the stress intensity factor (SIF) in an aluminium plate. The plate is subjected to uniaxial tensile stress, while the piezoelectric actuator is excited with varying voltage levels. The analysis is conducted using the finite element method (FEM), a powerful numerical technique for simulating complex structures. The study assesses the stress distribution and employs the SIF as an adequate criterion for evaluating the impact of different patch configurations. The results indicate a strong correlation between the applied voltage and the SIF. Whether the SIF increases or decreases depends on the polarization of the piezoelectric actuator. particularly noteworthy is the finding that rectangular patches in a horizontal orientation significantly reduce the SIF compared to other patch geometries. Moreover, double-sided patches exhibit a pronounced decrease in the SIF compared to single-sided patches. In summary, this research underscores the potential of piezoelectric actuators in mitigating stress intensity in structures with circular hole with crack initiation. It offers valuable insights into the influence of applied voltage, patch geometry, and patch placement on the SIF, thereby contributing to developing effective strategies for enhancing structural integrity.

关键词： piezoelectric Actuators Stress Intensity Factor (SIF) Aluminium plate Voltage Finite Element Method (FEM)

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Fabrication and Characterization of Bamboo—Epoxy Reinforced Composite for Thermal Insulation

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Open Journal of Composite Materials 2024年第1期14卷 15-32页

作者： Nandavardhan Reddy Kopparthi Jens Schuster Yousuf pasha Shaik Institute of polymer Technology West palatine University of Applied Sciences Kaiserslautern Pirmasens Germany

As global warming intensifies, researchers worldwide strive to develop effective ways to reduce heat transfer. Among the natural fiber composites studied extensively in recent decades, bamboo has emerged as a prime candidate for reinforcement. This woody plant offers inherent strengths, biodegradability, and abundant availability. Due to its high cellulose content, its low thermal conductivity establishes bamboo as a thermally resistant material. Its low thermal conductivity, enhanced by a NaOH solution treatment, makes it an excellent thermally resistant material. Researchers incorporated Hollow Glass Microspheres (HGM) and Kaolin fillers into the epoxy matrix to improve the insulating properties of bamboo composites. These fillers substantially enhance thermal resistance, limiting heat transfer. Various compositions, like (30% HGM + 25% Bamboo + 65% Epoxy) and (30% Kaolin + 25% Bamboo + 45% Epoxy), were compared to identify the most efficient thermal insulator. Using Vacuum Assisted Resin Transfer Molding (VARTM) ensures uniform distribution of fillers and resin, creating a structurally sound thermal barrier. These reinforced composites, evaluated using the TOpSIS method, demonstrated their potential as high-performance materials combating heat transfer, offering a promising solution in the battle against climate change.

关键词： Thermal Insulator Rooftiles Hollow Glass Microspheres Bamboo Kaolin Epoxy VARTM process Thermal Conductivity Mechanical properties

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Development of Morus alba Reinforced poly-Lactic Acid with Elevated Mechanical and Thermal properties

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Materials Sciences and Applications 2024年第7期15卷 186-200页

作者： Girish Kumar Reddy Madda Jens Schuster Yousuf pasha Shaik Department of Applied Logistics and polymer Sciences University of Applied Sciences Kaiserslautern Institute for Plastics Engineering West Pfalz (IKW) Pirmasens Germany

This research investigates the mechanical and thermal properties of Morus alba combined with polylactic acid in comparison with other natural fibers. The study uses three different fiber and pLA compositions - 20%, 30%, and 40% respectively - to produce composite materials. In addition, another composite with the same fiber volume is treated with a 4% NaOH solution to improve mechanical properties. The composites are processed by twin-screw extrusion, granulation, and injection molding. Tensile strength measurements of raw fibers and NaOH-treated fibers were carried out using a single-fiber tensile test with a gauge length of 40 mm. It was observed that the NaOH surface treatment increases the resistance against tensile loading and exhibited improved properties for raw fiber strands. The diameter of the fibers was measured using optical microscopy. During this research, flexural tests, impact tests, differential scanning calorimetry (DSC), and heat deflection temperature measurements (HDT) were conducted to evaluate the mechanical and thermal properties of the developed composite samples. The results indicate that the mechanical properties of NaOH-treated Morus alba-reinforced polylactic acid outperform both virgin pLA samples and untreated Morus alba samples.

关键词： Morus Alba Fiber (MAF) White Mulberry polylactic Acid (pLA) Sodium Hydroxide (NaOH) Solution Single Fiber Tensile Test Thermal Stability Optical Microscopy

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Development of Kaolin and Glass Fiber Reinforced Composites for Thermal Insulating panels

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Open Journal of Composite Materials 2024年第1期14卷 44-59页

作者： Jagadiswar Reddy Tippi Reddy Jens Schuster Yousuf pasha Shaik Department of Applied Logistics and polymer Sciences University of Applied Sciences Kaiserslautern Institute for Plastics Engineering West Pfalz (IKW) Pirmasens Germany

In our modern world, where conserving energy is highly valued, thermal insulation panels play a crucial role in reducing heat transfer between two spaces, surfaces, or materials. They are used to enhance the energy efficiency of various industrial applications by minimizing heat loss and temperature control. These panels function as silent protectors, aiding in reducing energy consumption and making things more sustainable and better for the environment. This is where composite materials come in;they are known for their lightweight nature, high strength-to-weight ratio, and excellent thermal insulation properties and have gained significant attention. Researchers are actively engaged in various studies aimed at enhancing these materials further. This research project focuses on the development of kaolin and glass fiber-reinforced composites for thermally insulating panels, to which natural strengthening materials like corn husk and bamboo fibers are added. The aim is to create cost-effective and efficient composite materials for thermal insulation applications by incorporating these components with a binder consisting of potassium silicate, hydroxide, and distilled water. This project involves conducting compression tests, bending tests, impact tests, thermal conductivity measurements, and microscopic analysis to evaluate the mechanical and thermal properties of the developed composites. The profound impact of these engineered composites on thermal insulation panels stands to revolutionize energy conservation efforts, offering a potent avenue to minimize heat loss and enhance overall energy efficiency across an array of industrial sectors.

关键词： Kaolin Glass Fiber Corn Husk Bamboo potassium Silicate potassium Hydroxide

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Etiology and therapeutic management of neonatal jaundice in Iran:a systematic review and meta-analysis

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World Journal of pediatrics 2020年第5期16卷 480-493页

作者： Yadollah Zahed pasha Shaghayegh Alizadeh-Tabari Ermia Zahed pasha Mohammad Zamani Non-Communicable pediatric Diseases Research Center Amirkola Children's HospitalBabol University of Medical SciencesBabolIran Student Research Committee Babol University of Medical SciencesBabolIran Department of pathology Rohani HospitalBabol University of Medical SciencesBabolIran Cancer Research Center Health Research InstituteBabol University of Medical SciencesBabolIran

Background Jaundice is a life-threatening disorder in the *** the present study,we aimed to assess systematically available evidence on causes and management of jaundice in Iranian newborn *** We searched the databases of pubMed,Web of Sciences,Scopus and Google Scholar for English articles published since inception until May 2019.A search was also done for persian articles in Magiran and Scientific Information *** were evaluated based on predefined criteria by two *** analysis was performed by STATA *** A total of 33 articles were finally *** overall pooled prevalence of causes of jaundice among Iranian neonates was as follows:ABO blood groups incompatibility,16.9%[95%confidence interval(CI)10.9-22.8];Rh blood group incompatibility,4%(95%CI 2.5-5.5);ABO and Rh blood groups incompatibility,3.6%(95%CI 0-7.7);glucose6-phosphate dehydrogenase(G6pD)deficiency,6.3%(95%CI 5.1-7.5);infection,6.6%(95%CI 5.2-8.1);hypothyroidism,4.2%(95%CI 0.1-8.3);infant of diabetic mother:2.3%(95%CI 0.1-4.5);unknown,50.7%(95%CI 33.4-68);cephalohematoma,0.6%(95%CI 0.3-0.9).Regarding treatment of icterus,seven and eight articles were found on phototherapy and exchange transfusion,*** five studies,all patients underwent phototherapy,but rate of exchange transfusion use was between 6.6%and 50.9%.Conclusions According to the results,unknown factors were the most common causes of icterus in Iranian neonates,followed by ABO blood groups incompatibility,infections and G6pD *** the way,phototherapy and exchange transfusion were found as therapeutic choices of neonatal jaundice.

关键词： Etiology Jaundice Newborn Systematic review Therapeutics

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Development of a Side Door Composite Impact Beam for the Automotive Industry

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Open Journal of Composite Materials（复合材料期刊） 2024年第1期

作者： Vinay papaiya Jens Schuster Yousuf pasha Shaik

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Fabrication and Characterization of Bamboo—Epoxy Reinforced Composite for Thermal Insulation

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Open Journal of Composite Materials（复合材料期刊） 2024年第1期

作者： Nandavardhan Reddy Kopparthi Jens Schuster Yousuf pasha Shaik

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