r. kumar
-
Construction and demolition (C&D) wastes are increasing continuously with intensified construction activities worldwide resulting in ecological concerns. Recycling of these waste products into recycled concrete aggregates (RCA) in base and sub-base layers of pavement is one of the solutions for the problem. Thus, the present study is an in-depth investigation of the utilization of the RCA in construction sector containing laboratory tests, microstructural characterization, and economic analysis. The experiment revealed that, for each mix proportion, the maximum dry density decreases and the ideal moisture content increases as the cement percentage is increased. The 7-day average ultimate compressive strength value for natural aggregates (NA) and recycled concrete (RCA) combined with additives met the requirements. The durability index for all the mix proportions was greater than 0.80. Finally, it was found that 17.86% of the material cost was saved with incorporation of RCA (50%)-NA (50%) for the construction of the sub-base layer of the pavement.Keywords: Construction, demolition wastes, Recycled concrete aggregates, Microstructural Characterization, Economic Analysis, Ultimate Compressive Strength
-
Fault detection and its restoration is the major challenge for the smooth functioning of the Multi-Level Inverter (MLI). In this paper, fault detection and its clearance scheme for an Open Circuit (OC) fault on a 3-level 5-level Cascaded H-Bridge Multi-Level Inverter (CHBMLI) has been developed and tested to improve the reliability and suitability of the system. An accurate and fast detection, isolation and bypassing of faulty bridges enhance the reliability, suitability, and acceptability of CHBMLI in any domestic, industrial drive applications. To reschedule the line voltage and current value close to the pre-fault level, a Neutral Point Shift (NPS) technique is presented in this paper. The desired output voltage is governed by Level Shift Pulse Width Modulation (LSPWM) technique. The proposed scheme is developed in MATLAB/Simulink environment and results are validated by using Opal-RT simulator. Simulation results has confirmed the performance and Opal-RT simulator results shows feasibility and applicability of the proposed scheme.
Keywords: Cascaded Multi-level Inverter, Level Shift PWM Technique, Fault Detection, Fault Tolerant, Neutral Point Shift Technique -
We show that the radical bundle of an algebra bundle is a characteristic ideal bundle. Further we prove an algebra bundle is semisimple if and only if its derivation algebra bundle is either semisimple or zero.Keywords: Algebra bundle, Characteristic ideal bundle, Radical bundle, semisimple algebra bundle, Vector bundle
-
The global demand for food can be eliminated by precision farming. This research work proposes a low-cost IoT-enabled handy device to measure soil water content. Three different sensor probes are designed in COMSOL Multiphysics 5.4 and fabricated using PCB Technology. The designed sensor probes are calibrated to effectively measure moisture content for three different soil types (silt/sandy/clay). An electronic system has been programmed according to Optimized-Moisture-Value (OMV) algorithm to read and collect the soil moisture information. Three sensor probes, capacitance, and voltage responses are analyzed using linear fitting. It has been observed from the response data that model B's performance is better than the other two presented models in terms of soil moisture. The obtained goodness of fitness value for model B is around 0.999 for all the categories of soils. The electronic system is built around W78E054D and ESP8266 controllers. The W78E054D controller is used to excite the sensor probe with a signal having a frequency of 500 kHz. The IoT-enabled controller ESP8266 reads and collects the soil moisture data according to the OMV algorithm.Keywords: Fringing field capacitive sensor, Soil moisture, Internet of Things (IoT), OMV algorithm, COMSOL simulation
-
Measurement of soil moisture and control of irrigation according to the measured data is crucial in agriculture fields where water scarcity is always a serious issue. For this purpose, a cost-effective distributive network system has been proposed and developed using technology like IoT to control complex irrigation processes. An internet-enabled embedded moisture sensing unit was designed that consists of a capacitive sensor probe and electronic system to process the soil moisture value. The sensor probe was calibrated for six different varieties of soil using the Thermo gravimetric method. The output response is inspiring, with a goodness of fit value of 0.99. Algorithms are developed for irrigation control that operates by a developed web-based application from the control station. The system was implemented at a total cost of 122.37 US dollars and tested in cassava agriculture field for loam soil in Nagaland, India, for 91 days and showed magnificent water saving of up to 95% compared with traditional approaches.Keywords: Soil moisture, Irrigation control, Distributive network system, capacitive moisture sensor, Embedded moisture sensing unit
-
A greater community of researchers widely studies fog computing as it reduces the massive data flow to the existing cloud-connected network and performs better for real-time systems that expect a quick response. As the fog layer plays a significant role in a fog-cloud system, all of the devices participating in fog computing must be balanced with appropriate load to upstretched the system performance. The proposed method is founded on a tree-based dynamic resources arrangement mechanism that refreshes the fog clusters created using Fuzzy C Mean (FCM) to increase the speed of resource allocation. With the help of Fuzzy rule-based load calculation and intra-cluster job allocation, the load inside the group is maintained. The system also has the facility of inter-cluster job forwarding, which works on demand. A novel load balancing strategy, Real-Time Flexi Forwarded Cluster Refreshing System (RTFRS) is proposed by which all the tasks can be handled efficiently within the fog cloud system. The proposed system is designed so that overall complexity is not upraised and becomes suitable for fog computing architecture with low processing capacity by maintaining the quality of service. Experimental results show that the proposed model outperforms standard methods and algorithms used in fog computing concerning average turnaround time, average waiting time, resource utilization, average failure rate, and the load on the gateway.Keywords: Fog Computing, Cloud Computing, Load Balancing, Fuzzy System, Clustering
-
In this paper, the effects of weight concentration of nanoparticles and temperature on the viscosity of water-based copper oxide nanofluids have been studied experimentally using analysis of variance (ANOVA)-based two-factor three-level (23) factorial design. The results show that a maximum increase of 23.12% in viscosity is observed at 30°C temperature as the weight concentration of nanoparticles increases from 0.03 to 0.3wt.%. Whereas the temperature increases from 30 to 60°C, the viscosity decreases up to 46.19% in the case of 0.3wt.% nanofluid. Temperature is found to be more dominant than the concentration of nanoparticles. The optimum value of viscosity (0.513 mPa.s) is found at concentrations of 0.1wt.% and 60°C temperature with an 18.72% enhancement in viscosity as compared to the base fluid. The experimental and model values of viscosity have been compared with the predictions of the proposed equation for viscosity. The experimentally measured results are found near the proposed results whereas the model underestimates the viscosity in the case of all nanofluids. The maximum underestimation of 25.92 % was observed in the case of 0.3wt.% nanofluid at 60°C temperature.
Keywords: Viscosity, Temperature, Nanofluid, Analysis of Variance, Concentration, Contour, Surface Plots -
In this paper, We define Jordan algebra bundles of finite type and we give one-one correspondence between Jordan algebra bundles of finite type and Jordan rings.Keywords: Jordan algebra bundle, Lie algebra bundle, Vector bundle
-
Platelets are the reservoir of growth factors and play a major role in several physiological processes, such as coagulation, angiogenesis, immune response, and tissue repair. Platelet concentrates are broadly classified into two groups depending on their fibrin content, namely platelet-rich plasma (PRP) and platelet-rich fibrin (PRF). They are further divided based on their leucocyte contents. The PRP is plasma containing supra-physiological concentrations of the platelets. The growth factors present in the PRP play a crucial role in the promotion of local angiogenesis, regulation of cellular activity, stem cell homing, proliferation and differentiation of different stem cells, and deposition of matrix proteins contributing to tissue regeneration. This review aimed to establish the therapeutic potential of PRP in canine medicine with a particular focus on the applications in ophthalmology, dermatology, and musculoskeletal disorders. A systematic literature review was performed to identify the literature published during the past 20 years (2001-2021) using authentic academic databases, such as PubMed, Science Direct, Google Scholar, and Scopus. In the initial search, 556 articles were identified and based on the specific inclusion and exclusion criteria, 59 articles were selected for further analysis. The clinical efficacy of PRP depends on the number of platelets and the growth factor concentration. The PRP-based biological therapy has broad clinical applications in musculoskeletal pathologies. It is a simple, safe, and cost-effective method that can be used to treat various diseases and disorders in canine practice. For example, PRP is used for managing corneal ulcers, corneal erosion, alkali burn, keratoconjunctivitis sicca, burn wounds, chronic wounds, cutaneous ulcers, acute traumatic bone fractures, tendinopathies, cartilage pathologies, osteoarthritis, and abdominal wall defects either as monotherapy or as an adjunctive therapeutic agent. In addition, PRP is widely used as a carrier of mesenchymal stem cells for transplanting into bone defects. Therefore, allogeneic PRP therapy can be considered a simple, safe, and cost-effective method for the treatment of various diseases and disorders in canine practice. The therapeutic application of PRP in canine medicine is limited in the present study due to the lack of consensus for collection, characterization, and clinical use. Hence, further studies are required to establish the actual worth of PRP-based regenerative strategies in canine medicine.
Keywords: canine medicine, canine practice, dermatology, platelet-rich plasma, regenerative medicine -
We show that, every derivation of a Lie algebra bundle can be viewed as an inner derivation if one embeds the Lie algebra bundle into a larger Lie algebra bundle. We define, the radical and the nilradical bundle of a Lie algebra bundle and prove, both are characteristic ideal bundles of Lie algebra bundle.Keywords: Characteristic ideal bundle, Lie algebra bundle, Radical bundle, Vector bundle
-
In the present investigation the reflection and transmission phenomenon of plane waves between two half spaces elastic and orthotropic piezothermoelastic with two-temperature theory is discussed. A piezothermoelastic solid half space is assumed to be loaded with an elastic half space. Due to the phenomenon, four qausi waves are obtained; quasi longitudinal (qP) wave, quasi transverse (qS) wave, quasi thermal (qT) wave and electric potential wave (eP). It is found that the amplitude ratios of various reflected and refracted waves are functions of angle of incidence, frequency of incident wave and are influenced by the piezothermoelastic properties of media. The energy ratios are computed numerically using amplitude ratios for a particular model of graphite and cadmium selenide (CdSe). The variations of energy ratios with angle of incidence are shown graphically depicting the effect of two-temperature. The conservation of energy across the interface is justified. A particular case of interest is also deduced from the present investigation.Keywords: Reflection, Piezothermoelastic, Energy ratios, Transmission, Orthotropic, Amplitude ratios
-
A dynamic mathematical model of photothermoelastic (semiconductor) medium is developed to analyze the deformation due to inclined loads. The governing equations for photothermoelastic with dual phase lag model are framed for two dimensional case and are further simplified by using potential function. Appropriate transforms w.r.t time (Laplace) and w.r.t space variables (Fourier) are employed on the resulting equations which convert the system of equations into differential equation. The problem is examined by deploying suitable mechanical boundary conditions. Specific types of distributed loads as uniformly distributed force and Linearly distributed force are taken to examine the utility of the model. The analytic expressions like displacements, stresses, temperature distribution and carrier density are obtained in the new domain (transformed).To recover the quantities in the physical domain, numerical inversion technique is employed. Numerical computed results with different angle of inclination vs distance are analyzed with and without dual phase lag theories of thermoelasticity in the form of visual representations. It is seen that physical field quantities are sensitive towards photothermoelastic and phase lag parameters.Keywords: Photo-thermal, semiconductor, Inclined load, Laplace, Fourier transforms
-
پیشینه
فتق دیسک بین مهره ای (IVDH) یکی از دلایل عمده آسیب های نخاعی (SCI) در سگ ها است. این ضایعه معمولا با رفع فشار به وسیله جراحی که شامل برداشتن مواد دیسک بیرون زده است، درمان می شود. با این حال، میزان نرخ بهبودی پس از مداخلات جراحی متغیر است و بارها رضایت بخش نیست. هدف از این گزارش مستند سازی یک مورد پاراپلژیای ناشی از IVDH در یک سگ بیگل و مدیریت درمانی آن با استفاده از سلول های بنیادی مزانشیمی مشتق شده از مغز استخوان آلوژنیک (aBM-MSCs) است.
توصیف بیماراین سگ با پاراپلژیایی که از 3 هفته قبل آغاز شده بود معرفی شد. بر اساس یافته های مقطع نگاری کامپیوتری (CT)، شرایط به عنوان IVDH هانسن تیپ 1 در فضای بین مهره ای T12 تا T13 تشخیص داده شد. یافته ها/درمان و نتیجه درمان: به منظور درجه بندی نقص عصبی، معاینه عصبی انجام شد. جداسازی، کشت و شناسایی aBM-MSCs بر اساس دستورالعمل استاندارد انجام شد. سوسپانسیون سلولی آماده شده از aBM-MSCs از طریق پوست به پارانشیم طناب نخاعی در محل آسیب پیوند زده شد. در مجموع چهار دوز از 106 × 1 سلول در فاصله های 15 روزه به همراه متیل کوبال آمین و گاباپنتین خوراکی تجویز شد. بهبودی بر اساس معاینه عصبی و درجه بندی ارزیابی شد. پس از تجویز اولین دوز از aBM-MSCs، بهبودی قابل توجهی مشاهده شد. پس از تجویز دو دوز، حیوان شروع به تحمل وزن کامل بر اندام های خلفی کرد.
نتیجه گیریپیوند aBM-MSCs از طریق پوست ممکن است که نقش مهمی در بهبود نقایص عصبی ثانویه ناشی از IVDH در این سگ ایفا کرده باشد. برای تایید اثر بخشی درمان با aBM-MSCs در بر طرف کردن نقایص عصبی ناشی از IVDH به مطالعات بیشتری ترجیحا در جمعیت بزرگ تر نیاز است.
کلید واژگان: سگ، دیسک بین مهره ای، سلول های بنیادی مزانشیمی، پاراپلژیا، آسیب های طناب نخاعیBackgroundIntervertebral disc herniation (IVDH) is one of the common causes of spinal cord injury (SCI) in dogs. It is commonly treated by performing surgical decompression that involves the removal of the extruded disc material. However, the recovery rates after surgical interventions are variable and many times unsatisfactory. This report aims to document a case of paraplegia associated with IVDH in a Beagle dog and its therapeutic management using allogenic bone marrow-derived mesenchymal stem cells (aBM-MSCs).
Case descriptionThe dog was presented with paraplegia that was initiated three weeks back. Based on the findings of computed tomography (CT), the condition was diagnosed as Hansen type I IVDH at T12-T13 intervertebral space. Findings/treatment and outcome: Neurological examination was performed to grade the neurological deficit. The isolation, culture, and characterization of aBM-MSCs were done as per the standard protocol. The prepared cell suspension of aBM-MSCs was percutaneously transplanted to the spinal cord parenchyma at the site of injury. A total of four doses of 1 × 106 cells were given at an interval of 15 days along with methylcobalamin and gabapentin orally. Improvement was evaluated based on the neurological examination and grading. Considerable improvement was noticed after the first dose of aBM-MSCs. The animal started complete weight bearing on its pelvic limbs after two doses.
ConclusionPercutaneous transplantation of aBM-MSCs might have played an important role in reversing the neurological deficits secondary to IVDH in this dog. Further studies are required preferably in a larger population to confirm the efficacy of aBM-MSCs therapy in ameliorating neural deficits associated with IVDH.
Keywords: dog, Intervertebral Disc, Mesenchymal Stem Cells, Paraplegia, Spinal Cord Injuries -
The present investigation deals with study of thermoelastic damping and frequency shift of Kirchhoff plate resonators by using generalized thermoelasticity theory of dual-phase-lag model. The basic equations of motion and heat conduction equation are written with the help of Kirchhoff-Love plate theory and dual phase lag model. The analytical expressions for thermoelastic damping and frequency shift of modified couple stress dual-phase-lag thermoelastic plate have been obtained. A computer algorithm has been constructed to obtain the numerical results. Influences of modified couple stress dual-phase-lag thermoelastic plate, dual- phase-lag thermoelastic plate and Lord-Shulman (L-S, 1967) thermoelastic plate with few vibration modes on the thermoelastic damping and frequency shift are examined. The thermoelastic damping and frequency shift with varying values of length and thickness are shown graphically for clamped-clamped and simply-supported boundary conditions. It is observed from the results that the damping factor and frequency shift have noticed larger value in the presence of couple stress for varying values of length but opposite effect are shown for varying values of thickness in case of both vibration modes and boundary conditions.
Keywords: Modified couple stress theory, Kirchhoff-Love plate theory, Dual-phase-lag model, Thermoelastic damping, Frequency shift -
پیشینه:
اجسام خارجی داخل چشمی (IOFBs) از قبیل تیر تفنگ بادی یک یافته نادر در حیوانات وحشی مانند میمون رزوس (ماکاکا مولاتا) هستند. هدف از گزارش علمی حاضر توصیف جراحی خارج سازی IOFB ناشی از زخم گلوله در یک میمون رزوس وحشی بود.
توصیف بیمار:
یک میمون رزوس ماده جوان با سابقه تورم و التهاب چشم راست از چند روز گذشته، آورده شد.
یافتهها/درمان و نتیجه درمان:
معاینه بالینی، یک زخم نسبتا بهبود یافته بر روی پلک پشتی را نشان داد. بررسی رادیوگرافی وجود یک جسم خارجی فلزی را در حدقه سمت راست نشان داد. پلک ملتهب و مداوم بسته مانع از مکان یابی دقیقتر جسم خارجی فلزی شد. کانتوتومی جانبی تحت بیهوشی عمومی انجام شد. به دنبال عدم یافتن جسم خارجی فلزی در آدنکس چشم، زجاجیه برداری چشم راست برای خارج سازی IOFB، انجام شد. جسم خارجی فلزی از اتاقک خلفی چشم راست خارج شد. به علت پیش آگهی ضعیف چشم آسیب دیده، تخلیه چشم و به دنبال آن دوختن پلکها انجام شد. در بررسی بیشتر مشخص شد که جسم خارجی یک گلوله 5/4 میلی متری تفنگ بادی (کالیبر 177.) است. پس از عمل جراحی حیوان با آنتی بیوتیکها و داروهای ضد التهاب تیمار شد. بهبودی حیوان بدون مشکل بود.
نتیجهگیری:
اجسام خارجی داخل چشمی ناشی از زخم گلوله باید همیشه به عنوان فوریتهای جراحی در نظر گرفته شوند. برای جلوگیری از عوارض بیشتر در مواردی که پیش آگهی ضعیف است به خصوص در حیوانات وحشی مثل میمون رزوس، باید تخلیه و در آوردن چشم انجام شود.
کلید واژگان: تخلیه چشم، جسم خارجی در چشم، ماکاکا مولاتا، میمون رزوس، برداشتن زجاجیهBackgroundIntraocular foreign bodies (IOFBs) such as air gun pellet is a rare finding in wild animals like Rhesus macaque (Macaca mulatta). The purpose of the present scientific report is to describe the surgical retrieval of IOFB secondary to ballistic wound in a wild Rhesus macaque.
Case description:
A juvenile female wild Rhesus macaque was brought with the history of swollen and inflamed right eye for the past several days.
Findings/treatment and outcome:
Clinical examination revealed presence of partially healed wound over the dorsal eyelid. Radiographic examination revealed the presence of a metallic foreign body inside the right orbit. Inflamed and persistently closed eyelid prevented the further localization of the metallic foreign body. Lateral canthotomy was performed under general anesthesia. Following the failure to recover the metallic foreign body from the ocular adnexa, right eye vitrectomy was performed to retrieve the IOFB. The metallic foreign body was recovered from the posterior chamber of the right eye. Due to the poor prognosis of the already damaged eye, enucleation of the eye was performed which was followed by tarsorrhaphy. Further examination of the foreign body identified it as a 4.5 mm (.177 Calibre) air gun pellet. Post-operatively animal was treated with antibiotics and anti-inflammatory drugs. The animal recovered uneventfully.
ConclusionIntraocular foreign bodies secondary to gunshot wound should always be considered as a surgical emergency. Enucleation should be performed in cases having poor prognosis to avoid further complications especially in wild animals like Rhesus macaque.
Keywords: Eye enucleation, Eye foreign body, Macaca mulatta, Rhesus macaque, Vitrectomy -
In this study an effort has been made for the plasma ion nitriding (PIN) of Inconel 600 and 601 alloys at low temperatures. After plasma ion nitriding, microstructure study, growth kinetics of nitrided layer formation and wear properties were investigated by various characterization techniques such as; scanning electron microscope (SEM), X-ray diffraction (XRD) analysis, micro-hardness measurement and wear test by pin on disk technique. It was found that, surface micro-hardness increases after PIN process. A mix peak of epsilon (ε) phase with fcc (γ) phase was detected for all temperature range (350 0C to 450 0C), while the chromium nitride (CrN) phase was detected at elevated temperature range ~450 0C in inconel 601 alloy. The calculated values of diffusion coefficient and activation energy for diffusion of nitrogen are in accordance with the literature. Volume loss and wear rate of the plasma nitrided samples decreases, but it increases as PIN process temperature increases.
Keywords: Micro-hardness, X-ray diffraction, Wear test, Diffusion coefficient, Plasma nitriding -
Background
Trans Fatty Acid (TFA) content in oil is an important quality parameter due to its adverse health effect. This study was aimed to examine the TFA content in the frying oil used by street food vendors in India for two traditional snack foods.
MethodsTotally, 143 oil samples were collected at different frying times (0, 2, and 4 h) from five different vendors for Samosa and Jalebi. TFA levels of the oil samples were analyzed by Attenuated Total Reflection-Fourier Transform Infrared Spectroscopy (ATR-FTIR). Statistical analyses were carried out using SPSS software version 23.0.
ResultsATR-FTIR spectra exhibited an increase in peak intensity at 966 cm-1 with different frying time in both frying oil samples, indicating the formation of TFA. The TFA content in oils fried at 4 h was significantly higher than the ones at 0 and 2 intervals. It was found that 3 out of 74 (4%) Samosa fried oils and 12 out of 69 (17.4%) Jalebi fried oils were over the maximum allowed regulatory limit of TFA (5%). Jalebi fried oils had significantly higher TFA content than Samosa fried oils.
ConclusionThe increase in frying time decreased the peroxide values and increased saturated fatty acids and TFA values of oils used for both food items. The local vendors and consumers should be educated by national authorities regarding health risk of TFA in street fried snacks.
Keywords: Trans Fatty Acids, Plant Oils, Fourier Analysis, Snacks, India -
The fundamental solution of the system of differential equations in bio-thermoelasticity with dual phase lag (DPL) in case of steady oscillations in terms of elementary function is constructed and basic property is established. The tissue is considered as an isotropic medium and the propagation of plane harmonic waves is studied. The Christoffel equations are obtained and modified with the thermal as well as bio thermoelastic coupling parameters. These equations explain the existence and propagation of three waves in the medium. Two of the waves are attenuating longitudinal waves and one is non-attenuating transverse wave. The thermal property has no effect on the transverse wave. The velocities and attenuating factors of longitudinal waves are computed for a numerical bioheat transfer model with phase lag. The variation with frequency, thermal parameters, blood perfusion parameter and phase lag parameter are presented graphically. Also the reflection of plane wave from a stress free isothermal boundary of isotropic bio-thermoelastic half space in the context of DPL theory of thermoelasticity is studied. The amplitude ratios of various reflected waves are obtained and these amplitude ratios are further used to obtain the energy ratios of various reflected waves. These energy ratios are function of the angle of incidence and bio-thermoelastic properties of the medium. The expressions of energy ratios have been computed numerically for a particular model to show the effect of Poisson ratio, blood perfusion rate and phase lag parameters.
Keywords: Fundamental solution, Dual-phase-lag, Bio-thermoelasticity, Wave propagation, Energy ratios -
This study investigates that the sound wave propagation of multiferroic thermo elastic Nanofibers under the influence of surface effect and parametric excitation via Timoshenko form of beam equations. The equation of analytical model is obtained for Nanofiber through shear and rotation effect. The solution of the problem is reached through the coupled time harmonic equations in flexural direction. Graphs are drawn for frequency, phase velocity, piezoelectric strain, magnetic field and dynamic displacement at different vibration modes of Nanofibers. From the result obtained, it is seen that the surface effect and excitation frequency gives significant contribution to the physical variables of the Nanofiber. The frequency grows in the presence of surface effect and decay as length increases both in Euler’s and Timoshenko beam theory. Also, a comparison of numerical results is made with existing literature and good agreement is arrived. The present study is expected to be more helpful for the design of piezo-thermo-magneto-mechanical Nanofiber-based devices.
Keywords: Sound waves, Nano fiber, Parametric excitation, Surface effect, NEMMS -
In this work, the nonlocal elastic waves in a fluid conveying armchair thermo elastic single walled carbon nanotube under moving harmonic load is studied using Eringen nonlocal elasticity theory via Euler Bernoulli beam equation. The governing equations that contains partial differential equations for single walled carbon nanotube is derived by considering thermal and Lorenz magnetic force. The small scale interactions induced by the nano tubes are simulated by the non-local effects. The time domain responses are obtained by using both modal super position method and Newmarks’s direct integration method. The effect of nonlocal parameter, thermal load, magnetic field of the moving harmonic load on the dynamic displacement of SWCNT is discussed. The results obtained show that the dynamic displacement of fluid conveying SWCNT ratio is significantly affected by the load velocity and the excitation frequency. This type of results presented here, will provide useful information for researchers in structural nano science to understand the small scale response of elastic waves coupled with thermo elasticity and some field forces.Keywords: Nonlocal model, Thermo elastic nanotube, Harmonic load, Newmarks’s direct integration method, Armchair
-
In this research, a plan to implement a zero-energy building (ZEB) for a hot and dry climate region of Iran (Yazd) is introduced and a comparison with a typical house of that climate is performed. Based on climate conditions, several active or passive methods are available in order to create a balance between energy supply and demand, namely improving wall insulations by using efficient heating/cooling devices, using solar energy, utilizing energy storage devices, and etc. Here, the SketchUp software is employed to present the plot of the selected building. In addition, one of the interfaces of Energy plus software called "BEOpt" is used for performing energy and economic analyses on the fast-constructed and pre-fabricated schemes. Considering the equipment’s world price, the results demonstrate that the zero-energy building scheme in selected climate conditions is applicable and the payback period is estimated to be about 5.5 years. In addition, replacing the typical buildings with a ZEB will decrease carbon dioxide emissions by about 27.4 metric tons/yr.
Keywords: Zero Energy Building, Green building, Iran climate, Energy optimization, Reducing energyconsumption, clean Energy -
The problem treated here is to determinethe viscosity effect on stresses, temperature change and chemical potential in a circular plate. The mathematical formulation is applied to two theories of thermoelastic diffusion developed by Sherief et al. [27] with one relaxation time and Kumar and Kansal [9]with two relaxation times. Laplace and Hankel transform techniques are used to obtain the expression for the displacement components, stresses, temperature change and chemical potential. The resulting quantities are computed numerically and depicted graphically by using numerical inversion technique for a particular model. Effect of viscosity is shown in the normal stress, tangential stress, temperature change and chemical potential. Some particular cases of interest are also deduced. Viscoelastic materials play an important role in many branches of engineering, technology and, in recent years, biomechanics. Viscoelastic materials, such as amorphous polymers, semicrystalline polymers, and biopolymers, can be modelled in order to determine their stress or strain interactions as well as their temporal dependencies.Keywords: Viscothermoelastic, Thick circular plate, Laplace, Hankel transforms, Viscosity
-
This paper studies the propagation of shear waves in a composite structure consisting of a piezoelectric layer perfectly bonded over a micropolar elastic half space. The general dispersion equations for the existence of shear waves are obtained analytically in the closed form. Some particular cases have been discussed and in one special case the relation obtained is in agreement with existing results of the classical –Love wave equation. The micropolar and piezoelectric effects on the phase velocity are obtained for electrically open and mechanically free structure. To illustrate the utility of the problem numerical computations are carried out by considering PZT-4 as a piezoelectric and aluminium epoxy as micropolar elastic material. It is observed that the micropolarity present in the half space influence the phase velocity significantly in a particular region. The micropolar effects on the phase velocity in the piezoelectric coupled structure can be used to design high performance acoustic wave devices.Keywords: Shear wave, Micropolar, Piezoelectric, Dispersion, Phase velocity
-
In the present manuscript, we investigated a two dimensional axisymmetric problem of nonlocal microstretch thermoelastic circular plate subjected to thermomechanical sources. An eigenvalue approach is proposed to analyze the problem. Laplace and Hankel transforms are used to obtain the transformed solutions for the displacements, microrotation, microstretch, temperature distribution and stresses. The results are obtained in the physical domain by applying the numerical inversion technique of transforms. The results of the physical quantities have been obtained numerically and illustrated graphically. The results show the effect of nonlocal in the cases of Lord Shulman (LS), Green Lindsay (GL) and coupled thermoelasticity (CT) on all the physical quantities.Keywords: Nonlocal microstretch, Thermoelasticity, Laplace, Hankeltransforms, Eigenvalue approach, Circular plate
-
The present paper is devoted to the determination of displacement, stresses and temperature from three dimensional anisotropic half spaces due to presence of heat source. The normal mode analysis technique has been used to the basic equations of motion and generalized heat conduction equation proposed by Green-Naghdi model-II [1]. The resulting equation are written in the form of a vector –matrix differential equation and exact expression for displacement component, stresses, strains and temperature are obtained by using eigen value approach. Finally, temperature, stresses and strain are presented graphically and analyzed.Keywords: Eigenvalue, Generalized thermoelasticity, Normal mode analysis, vector-matrix, Differential equation
- در این صفحه نام مورد نظر در اسامی نویسندگان مقالات جستجو میشود. ممکن است نتایج شامل مطالب نویسندگان هم نام و حتی در رشتههای مختلف باشد.
- همه مقالات ترجمه فارسی یا انگلیسی ندارند پس ممکن است مقالاتی باشند که نام نویسنده مورد نظر شما به صورت معادل فارسی یا انگلیسی آن درج شده باشد. در صفحه جستجوی پیشرفته میتوانید همزمان نام فارسی و انگلیسی نویسنده را درج نمایید.
- در صورتی که میخواهید جستجو را با شرایط متفاوت تکرار کنید به صفحه جستجوی پیشرفته مطالب نشریات مراجعه کنید.