Feasibility of waste-derived hydroxyapatite mixed with ultra high molecular weight polyethylene composites for fused deposition modeling process

In this study, feasibility of waste-derived hydroxyapatite (HAp) reinforced UHMWPE composites for Fused Deposition Modeling (FDM) process was investigated. Compared to the commercial HAp, derived from natural resources such as corals, fish bone and eggshells have been converted into HAp and show the similarity with the commercial HAp. Ca/P ratio was so important to human body because Ca influence growth of human bones and P play a role in immune system activation. This research has used waste eggshell has been used to synthesize HAp by using hydrothermal synthesis. The Ca/P ratio was investigated by using SEM/EDS and XRD test. By using these test, it revealed Ca/P ratio of waste-derived HAp has shown 1.69 approximately with the standard Ca/P ratio (1.67). HAp/UHMWPE composites formulation samples were prepared by mixed between HAp and UHMWPE using Brabender Mixer. HAp/UHMWPE composite formulation samples were characterized by their weight percentage. The feasibility of each HAp/UHMWPE composite samples has been studied by their morphology, thermal and rheology properties by using SEM/EDS, TGA/DSC and Rheology test. Formulation sample U50H50 with 50 wt.% of HAp has shown the homogenous mixture, 1.69 Ca/P ratio, lowest melting point and good pseudo-plastic behavior compared to other formulation samples. Therefore, this formulation samples has been used in single screw extruder to fabricate diameter size of 1.75+0.05 mm filament wire for FDM process. DOE has been developed by using Taguchi method with the parameter controlled were die temperature and screw frequency. The optimum parameter setting to produce the diameter of 1.75+0.05 mm filament wire was successfully found at screw frequency of 2.5 Hz and die temperature of 190 ºC. The characteristic of the FDM process shows the samples with optimum dimensional accuracy and relative density was found at 245 ºC of temperature nozzle and 130 ºC of temperature platform. This result shown Hap/UHMWPE composite has potential to become material filament wire feedstock for FDM process

ROLE OF KATI BASTI AND PATRA POTTALI SWEDA IN THE MANAGEMENT OF GRIDHRASI- A CASE STUDY

The modern busy lifestyle of these days leads to several lifestyle disorders. Sciatica is one of the locomotory disorder occurs due to improper sitting posture, heavy weight lifting, stress injury and trauma to the spine. This disease became a great concern to the working people. Sciatica can be correlated with Gridhrasi in Ayurveda which is characterized as Ruk (pain), Stambha (stiffness), tingling sensation and numbness of lower limb. Gridhrasi is a type of Vatavyadhi mentioned in Ayurveda classics. Ayurveda through its advance treatment i.e. Panchakarma (Bio purification) eliminates the causative factors for disease. A male patient presented with signs and symptoms of Gridhrasi (sciatica) and MRI report suggesting of disc diffuse and disc protrusion and mild thecal compression. So In the present single case study patient was treated with Patra pottali sveda and Kati basti with some oral medicine. Both the therapies were effective in relieving symptoms like pain, stiffness, pricking sensation and numbness of leg

A study on IoT-related security issues, challenges, and solutions.

The Internet of Things is now being developed to be the most cutting-edge and user-centric technology in the works. Raising both an individual\u27s and society\u27s level of life is the goal of this endeavour. When a technology advances, it always acquires certain flaws, which are always open to being attacked and taken advantage of in some manner. In this work, the problems posed by the Internet of Things (IoT) based on the fundamental security principles of confidentiality, integrity, and availability are discussed. It has also been discussed how an overview of the security restrictions, requirements, processes, and solutions implemented for the challenges generated in secured communication inside the IoT ecosystem. In this paper, the vulnerabilities of the underlying Internet of Things network are brought to light, and many security concerns on multiple tiers of the Internet of Things ecosystem have been examined. Based on the findings of our research into the vulnerabilities that are now present, a variety of potential solutions have been proposed in order to solve the ongoing problems that are plaguing the IoT ecosystem. In addition to that, it provides an overview of the various protocols that are used for security in IoT

Lightweight Cryptography based Communication Model for Device Identification, Mutual Authentication, and Encryption in a Smart City Environment

Providing security to smart city networks is one of the challenging and demanding tasks in the present days, due to its increased utilization in smart intelligent transportation systems. For this purpose, there are various security protocols and mechanisms that have been developed in the existing works, which targets to establish the reliable and secured communication in smart city networks. However, it limits the major issues of increased computational cost, communication cost, storage overhead, and reduced efficiency. In order to solve these problems, the proposed work intends to design an intelligent security framework by using the Light-weight Cryptography based Communication Model (LCCM). Proposed framework includes the modules of setup initialization, vehicle registration, authentication, key generation, encryption, and decryption. Here, the Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) communications are performed with reduced cost complexity. For guaranteeing the security of networks, the random value-based key generation, data encryption, and decryption processes are performed. During the performance analysis, various evaluation measures have been used to assess the results of both convention and proposed security protocols. This paper presented a new methodology named as, LCCM for enhancing the security of smart city transportation networks

DRUG UTILIZATION BASED ADRS MONITORING OF ANTIHYPERTENSIVE AGENTS PRESCRIBED IN AL-QUWAYIYAH GENERAL HOSPITAL, SAUDI ARABIA

Objective: To monitor drug utilization based adverse drug reactions (ADRs) of antihypertensive agents prescribed in Al-Quwayiyah general hospital, Saudi Arabia.Methods: An open, non-comparative, observational study was conducted on hypertensive patients attending the medicine outpatient department of Al-Quwayyah general hospital, Al-Quwayyah, Saudi arabia. Data were collected by conducting patient interviews. Data were captured for adverse drug reaction monitoring based on Narinjo scale and WHO format.Results: 25 ADRs were observed out of 212 hypertensive patients. Incidence was found to be higher in patients more than 40 y age, and females experienced more ADRs (n = 16, 7.54%) than males, 9 (4.62%). Combination therapy was associated with more number of ADRs (64.0%) as against monotherapy (36.0%). Calcium channel blockers were found to be the most frequently associated drugs with ADRs (n = 8), followed by diuretics (n = 6), and β-blockers (n = 5). Among individual drugs, amlodipine was found to be the commonest drug associated with ADRs (n = 8), followed by torasemide (n = 4). ADRs associated with the central nervous system was found to be the most frequent (48.0%) followed by musculoskeletal complaints (20.0%) and respiratory system disorders (16.0%).Conclusion: ADRs were experienced by taking the antihypertensive drugs prescribed in Al-Quwayyah general hospital, Saudi arabia. The findings would be useful for physicians in rational prescribing. Calcium channel blockers were found to be the most frequently associated drugs with ADRs

NUMERIČKO MODELIRANJE UTJECAJA POČETNE DISTRIBUCIJE ZASIĆENJA VODOM NA IZVEDBU ZAVODNJAVANJA TOPLOM VODOM U NEIZOTERMNIM UVJETIMA

The heterogeneity in the spatial distribution of initial water saturation influences the performance of hot water flooding. The prospect of a reduction in oil recovery arises from the development of viscous instability. In the present study, a numerical simulation model has been developed by coupling heat transport, and multiphase flow in porous media integrated with the non-isothermal flow, and the numerical model has been verified with the existing analytical solution by Buckley and Leverett. The formation of a wavy temperature profile at the condensation front was found with a decreased depth of temperature penetration. The average rise of temperature is drastically affected by the spatial distribution of initial water saturation. The formation of viscous fingering was highly dominating in the reservoir, with initial water saturation randomly distributed and causing the front to move in an irregular pattern from the initial stage of the flooding. The heterogeneous reservoir with initial water distribution showed the earlier formation of viscous fingering than the homogeneous reservoir. The heterogeneity in the spatial distribution of initial water saturation had caused viscous instability, lower viscosity reduction, lower displacement sweeps efficiency, and higher residual oil saturation. The present study is limited to spatial distribution in initial water saturation to a certain degree of heterogeneity. The heterogeneity in the spatial distribution of initial water saturation highly impacted the production performance of hot water flooding. The present study provides an idea for the implementation and future development of hot water flooding in a randomly initial water saturation distributed environment.Heterogenost u prostornoj distribuciji početog zasićenja vodom utječe na izvedbu zavodnjavanja toplom vodom. Smanjenje iscrpka nafte proizlazi iz povećanja nestabilnosti viskoznosti. U ovom je istraživanju razvijen numerički simulacijski model, koji uključuje prijenos topline i višefazni protok u poroznoj sredini integriran s neizotermnim protokom, pri čemu je navedeni numerički model potvrđen postojećim analitičkim rješenjem Buckleya i Leveretta. Sa smanjenem dubine prodiranja topline utvrđeno je stvaranje valovitog temperaturnog profila na fronti kondenzacije. Na prosječni porast temperature drastično utječe prostorna raspodjela početnog zasićenja vodom. U ležištu s nasumično raspoređenim početnim zasićenjem vodom domininantno je bilo prstoliko prodiranje vode (engl. fingering) koje je od početne faze zavodnjavanje uzrokovalo pomicanje fronte u nepravilnom obrascu. Heterogeno ležište s početnom raspodjelom vode pokazalo je raniju pojavu prstolikog prodiranja utisnute tople vode od homogenog ležišta. Heterogenost u prostornoj distribuciji početnog zasićenja vodom uzrokovala je nestabilnost viskoznosti, manje smanjenje viskoznosti, niži koeficijent istiskivanja fluida i veću zasićenost zaostalom naftom. Ovo istraživanje je ograničeno na prostornu distribuciju početnog zasićenja vodom do određenog stupnja heterogenosti. Heterogenost u prostornoj distribuciji početnog zasićenja vodom uvelike je utjecala na proizvodni učinak zavodnjavanja toplom vodom. Ovo istraživanje daje ideju za implementaciju i budući razvoj zavodnjavanja toplom vodom u poroznoj sredini s nasumično raspodijeljenim početnim zasićenjem vodom

Study of Concrete Filled Unplasticized Poly-Vinyl Chloride Tubes as Columns under Axial Loading

This article aims to examine the behavior of Unplasticized Poly- Vinyl-Chloride (UPVC) bounded reinforced columns with polypropylene fibers under axial compression. To develop this model, a no samples of concrete filled UPVC pipe (CFUT)  with different geometric properties were tested. To obtain the specimens different class pipes with three different diameters were used to investigate the sensitivity of these columns to various parameters. The effect of each variable on the ultimate strength, ductility and confinement efficiency of the samples was investigated. All specimens were compressed by applying load only to the concrete core to obtain the load-displacement variations and the corresponding deformation mode. A finite element model was developed using the proposed stress-strain variation of confined concrete with UPVC tubes to simulate axial compression of CFUT specimens. According to the results obtained, the effect of the change in diameter-thickness ratio failure stress of concrete limited by (D/t) is obtained and discussed with empirical relationship. Polypropylene fibers were found to slightly increase column strength up to a certain volume fraction, after which the strength generally experienced a decrease