Study Some Mechanical Properties of Binary Polymer Blends Fabricated by Friction Stir Processing

تعتبر طريقة الاحتكاك والخلط تقنية واعدة لتحسين الخواص الميكانيكية لسطح الخلائط البوليميرية مع الاحتفاظ بخواص باقي الجسم، في هذا العمل جرت محاولة لإضافة نسب مختلفة من البولي بروبلين، ستيرين أكريلونيتريل والبولي فينيل كلوريد كمادة ثانية إلى البولي اثيلين عالي الكثافة (كمادة اساس). تم أجراء الاختبارات الميكانيكية (الصلادة والشد) لتقييم أداء عملية الاحتكاك والخلط لتحضير الخلائط البوليميرية الثنائية: (البولي اثيلين عالي الكثافة: بولي فينيل كلوريد)، (البولي اثيلين عالي الكثافة: ستيرين أكريلونيتريل) و (البولي اثيلين عالي الكثافة: بولي بروبلين) على عمق 3 مم من سطح (البولي اثيلين عالي الكثافة). أظهرت نتائج الاختبارات أن أفضل قيم للصلادة ومقاومة الشد تم الحصول عليها عند إضافة نسبة (15٪) من (البولي فينيل كلوريد) إلى المادة الاساس (البولي اثيلين عالي الكثافة).  في ضوء ما سبق، يمكن الاستنتاج أن تقنية الاحتكاك والخلط، يمكن أن تستخدم لإصلاح التشققات والعيوب التي تتكون على سطح المواد البوليميرية.Friction stir processing (FSP) is a promising technique to improve the mechanical properties of the polymer blends surface with retainment of bulk properties, in this work an attempt was done to add different ratios of polypropylene (PP), styrene acrylonitrile (SAN) and polyvinyl chloride (PVC) as a second material to the matrix plate high density polyethylene (HDPE). Mechanical properties were estimated for hardness and tensile tests were carried out to assess the performance of friction stir processed to prepared the binary polymers blends (HDPE: PP), (HDPE: SAN) and (HDPE: PVC) at depth 3 mm from the surface of (HDPE) plate. The results of the tests showed that the best values of the tensile strength, young modulus and hardness, it was obtained when adding the ratio of (15%) of the (PVC) to matrix (HDPE). The friction stir processing technique was successfully used to improve the mechanical properties of polymer surface. In view of the foregoing, it can be concluded that the friction stir processing technique, can be utilizing to repair the cracks and imperfections that are formed in polymeric materials

Axisymmetric stagnation-point flow of a third-grade fluid over a lubricated surface

In this article, axisymmetric stagnation-point flow of a third-grade fluid over a disk lubricated with a power law fluid is considered. Due to thin lubrication layer of variable thickness, third-grade fluid experiences a partial slip on the surface. The flow problem is governed through a system of nonlinear partial differential equations with nonlinear boundary conditions. A nonsimilar solution is presented in this article by implementing hybrid homotopy analysis method. This method combines the features of homotopy analysis and shooting methods. The results varying from no-slip to full-slip case are discussed under the influence of pertinent parameters

Lung Transplantation in a Patient with COVID-19-Associated Acute Respiratory Failure

Coronavirus disease 2019 (COVID-19) is currently a significant cause of acute respiratory failure worldwide, leading to irreversible fibrotic lung disease. In patients with persistent respiratory failure after acute COVID-19 infection, lung transplant is an emerging option. Here, we have presented a case where the patient required venovenous extracorporeal membrane oxygenation (VV-ECMO) support for 33 days until a bilateral lung transplant was performed on day 71 after the initial COVID-19 infection. The early outcomes have been favorable. Currently, no guidelines exist for an acceptable time period after initial COVID-19 infection, duration of negative COVID polymerase chain reaction (PCR) testing, or negative Vero cell culture in the setting of persistent positive COVID PCR testing before listing for a lung transplant. Due to a lack of standardized guidelines, this patient was not listed for a lung transplant until the COVID-19 PCRs came negative on days 47 and 49 after the infection

New Method to Harness More Wind Energy

A new and novel method to harness more wind energy has been designed Details of the experimental results and theoretical explanation is presented in the paper. The simplicity and economic viability of the method is expected to be a boon in converting poor windy sites to usable ones and to harness more energy at the existing windmill sites

Privacy Mining from IoT-based Smart Homes

Recently, a wide range of smart devices are deployed in a variety of environments to improve the quality of human life. One of the important IoT-based applications is smart homes for healthcare, especially for elders. IoT-based smart homes enable elders' health to be properly monitored and taken care of. However, elders' privacy might be disclosed from smart homes due to non-fully protected network communication or other reasons. To demonstrate how serious this issue is, we introduce in this paper a Privacy Mining Approach (PMA) to mine privacy from smart homes by conducting a series of deductions and analyses on sensor datasets generated by smart homes. The experimental results demonstrate that PMA is able to deduce a global sensor topology for a smart home and disclose elders' privacy in terms of their house layouts.Comment: This paper, which has 11 pages and 7 figures, has been accepted BWCCA 2018 on 13th August 201

Contribution of advanced fluorescence nano microscopy towards revealing mitotic chromosome structure

The organization of chromatin into higher-order structures and its condensation process represent one of the key challenges in structural biology. This is important for elucidating several disease states. To address this long-standing problem, development of advanced imaging methods has played an essential role in providing understanding into mitotic chromosome structure and compaction. Amongst these are two fast evolving fluorescence imaging technologies, specifically fluorescence lifetime imaging (FLIM) and super-resolution microscopy (SRM). FLIM in particular has been lacking in the application of chromosome research while SRM has been successfully applied although not widely. Both these techniques are capable of providing fluorescence imaging with nanometer information. SRM or nanoscopy is capable of generating images of DNA with less than 50 nm resolution while FLIM when coupled with energy transfer may provide less than 20 nm information. Here, we discuss the advantages and limitations of both methods followed by their contribution to mitotic chromosome studies. Furthermore, we highlight the future prospects of how advancements in new technologies can contribute in the field of chromosome science

Relationship Algebra for Computing in Social Networks and Social Network Based Applications

Online communities are the latest phenomena on the Internet. At the heart of each community lies a social network. In this paper, we show a generalized framework to understand and reason in social networks. Previously, researchers have attempted to use inference-specific type of relationships. In this paper, we propose a framework to represent and reason with general case of social relationship network in a formal way. We call it relationship algebra. This paper presents this algebra and then shows how this algebra can be used for various interesting computations on a social network weaved in the virtual communities

Evaluation of a maternal, neonatal and child health intervention package in a rural district of Pakistan: A quasi-experimental study

Background: Pakistan is among the countries which have the highest maternal, neonatal and child mortality rates. Immediate efforts are required to enable Pakistan to achieve the health related sustainable development goals. The continuum of care interventions can substantially reduce the mortality burden, however local evidence to implement them is lacking in Pakistan. We implemented the maternal, neonatal and child health intervention package comprised of health facility strengthening, capacity building, continuum of care interventions and community mobilization and evaluated its effectiveness on maternal, neonatal and child health care practices and neonatal mortality.Methods: The intervention package was delivered through existing public health system in a rural district of Pakistan. We used a quasi-experimental design to assess the impact of interventions. Baseline and end line surveys were conducted and neonatal mortality was considered as the primary outcome measure. Data were analysed using bivariate and difference and difference analysis techniques.Results: We found a reduced risk of neonatal mortality (RR 0.704; 95% CI 0.557-0.889; p=0.0033), in intervention areas compared to control area. For secondary outcomes; including mortality for infants and under five children, antenatal care, skilled birth attendance, institutional deliveries, postnatal care, delayed bathing, inappropriate cord care practices, birth asphyxia, exclusive breastfeeding and immunization a significant difference (p\u3c0.001) was observed in the intervention area compared to control area.Conclusions: This study provides local evidence from Pakistan that effective methods for delivering MNCH interventions within the existing health infrastructure can improve the MNCH outcomes especially in the rural areas

Perceived coercion and need for hospital admission among psychiatric in-patients: figures from a Pakistani tertiary care hospital

In Pakistan, an increasing proportion of psychiatric patients present to community health services as crisis admissions, with their relatives as the main decision makers. Patients are bound to perceive this process as coercive. Farnham & James (2000) report that elements of coercion are found even in voluntary hospital admission, in the form of verbal persuasion, physical force and threats of commitment. Few patients consider hospitalisation justified and most view the process of admission negatively (Swartz et al, 2003; Katsakou & Priebe, 2006; Priebe et al, 2009)