Flow and heat transfer in a Maxwell liquid sheet over a stretching surface with thermal radiation and viscous dissipation

The fluid flow and heat transfer behavior in a Maxwell liquid film over a stretching surface with thermal radiation and viscous dissipation is presented in this paper. The governing nonlinear thermal boundary layer that covers the physical problem is formulated and transformed into a system of higher order nonlinear ordinary differential equations using similarity transformation. The resultant systems of equations are solved numerically using Explicit Runge-Kutta scheme technique along with shooting technique. The effects of various thermophysical interesting parameters on the velocity profile, thermal energy and nanoparticle concentration, skin friction, Nusselt number and Sherwood number are discussed and analyzed graphically and numerically. Favorable comparisons with previous published papers have been done with an excellent agreement

USING FGM FOR CYCLIC SHELL STRUCTURES

This article deals with FGM for cyclic shell structure and the finite element modeling and analysis of functionally graded (FG) shell structures under self-loading. In order to study the influences of important parameters on the responses of FG shell structures, some types of cyclic shells have been considered. The responses obtained for FG shells are based on the analysis; some important results are presented and discussed for thincyclic shells

Hybrid Feature Selection Approach to Improve the Deep Neural Network on New Flow-Based Dataset for NIDS

Network Intrusion Detection System (NIDS) detects normal and malicious behavior by analyzing network traffic, this analysis has the potential to detect novel attacks especially in IoT environments. Deep Learning (DL)has proven its outperformance compared to machine learning algorithms in solving the complex problems of the real-world like NIDS. Although, this approach needs more computational resources and consumes a long time. Feature selection plays a significant role in choosing the best features only that describe the target concept optimally during a classification process. However, when handling a large number of features the selecting such relevant features becomes a difficult task. Therefore, this paper proposes Enhanced BPSO using Binary Particle Swarm Optimization (BPSO) and correlation–based (CFS) classical statistical feature selection approach to solve the problem on BPSO feature selection. The selected feature subset has evaluated on Deep Neural Networks (DNN) classifiers and the new flow-based CSE-CIC-IDS2018 dataset. Experimental results have shown a high accuracy of 95% based on processing time, detection rate, and false alarm rate compared with other benchmark classifiers

Characteristics of the Electrical Conductivity of the Basalt-Aluminum System Manufactured by Powder Technology

تضمنت الدراسة تدعيم مساحيق البازلت بواسطة الالمنيوم باستخدام طريقة المساحيق حيثُ تم اخذ نسب تدعيم الالمنيوم     (0, 10, 20. 30, 40 and 50%)  مع المادة الاساس البازلت. ثم خلط المساحيق وكبسها بمكبس كهربائي عند (ton4) ولزمن دقيقة واحدة, تم تلبيد العينات الناتجة بفرن حراري عند (1000) وباستخدام غاز الاركون لتقليل التأكسد ولزمن ساعتين فقط. تم دراسة البنية التركيبية للنماذج باستخدام المجهر الالكتروني الماسح (SEM) وكذلك دراسة الخصائص الكهربائية وعند مدى ترددي 50-5×106 Hz)) شملت الخصائص الكهربائية كل من (ثابت العزل الحقيقي والخيالي, زاوية الفقد, التوصيلية الكهربائية المتناوبة, المقاومة الكهربائية) مع التردد وعند درجة حرارة الغرفة. وجد من خلال الخصائص التركيبية تجانس النماذج وخصوصاً نموذج التدعيم 20Al)%) اما الخصائص الكهربائية اظهرت انخفاض لقيم ثابت العزل و زاوية الفقد مع زيادة التردد و زيادة قيم التوصيلية عند نموذج التدعيم 20Al)%) اكثر من بقية النماذجThis study included reinforcement of basalt powders with aluminum using powder method, where the reinforcement ratios of aluminum were (0, 10, 20. 30, 40 and 50%) with basalt material as a matrix. The two powders were mixed and have been pressed up to (4 ton) for (1 minute). The samples were sintered inside an oven at a temperature of (1000 ˚C) with the presence of Argon (Ar) gas in order to minimize oxidation, along two hours. The microscopic structure of the samples has been examined using scanning electron microscope (SEM)  along with the electrical properties in the frequency range between (50-5×106 Hz). The electrical properties included (real and imaginary dielectric constant, loss angle, electrical conductivity, electrical resistivity) were studied with the ranged frequencies at room temperature. The microstructure properties exhibited a homogenized properties especially sample with (20%Al). Concerning the electrical properties, the results showed a decrease in the dielectric constant and the loss angle with increasing the frequency and increasing the conductivity values at the (20%Al)  among other samples

Evolving trends in the management of acute appendicitis during COVID-19 waves. The ACIE appy II study

Background: In 2020, ACIE Appy study showed that COVID-19 pandemic heavily affected the management of patients with acute appendicitis (AA) worldwide, with an increased rate of non-operative management (NOM) strategies and a trend toward open surgery due to concern of virus transmission by laparoscopy and controversial recommendations on this issue. The aim of this study was to survey again the same group of surgeons to assess if any difference in management attitudes of AA had occurred in the later stages of the outbreak. Methods: From August 15 to September 30, 2021, an online questionnaire was sent to all 709 participants of the ACIE Appy study. The questionnaire included questions on personal protective equipment (PPE), local policies and screening for SARS-CoV-2 infection, NOM, surgical approach and disease presentations in 2021. The results were compared with the results from the previous study. Results: A total of 476 answers were collected (response rate 67.1%). Screening policies were significatively improved with most patients screened regardless of symptoms (89.5% vs. 37.4%) with PCR and antigenic test as the preferred test (74.1% vs. 26.3%). More patients tested positive before surgery and commercial systems were the preferred ones to filter smoke plumes during laparoscopy. Laparoscopic appendicectomy was the first option in the treatment of AA, with a declined use of NOM. Conclusion: Management of AA has improved in the last waves of pandemic. Increased evidence regarding SARS-COV-2 infection along with a timely healthcare systems response has been translated into tailored attitudes and a better care for patients with AA worldwide

Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Abstract Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries

Mucosal Schwann cell hamartoma of the gallbladder

Mucosal Schwann cell hamartoma (MSCH) is a rare benign neurogenic tumor characterized by pure S100p positive spindle cell proliferation. Most cases occur in the distal colon. Involvement of the gall bladder is exceedingly rare. There have been no reports of recurrence or a syndromic association with MSCH. Herein, we describe a case of MSCH of the gallbladder in a 55-year-old female patient with prior history of gastrointestinal neurofibromas who presented with abdominal pain. MR imaging revealed choledocholithiasis, gallbladder thickening, and marked biliary and pancreatic ductal dilation. The patient subsequently underwent cholecystectomy with choledochoduodenostomy. Histologic evaluation of the gallbladder showed diffuse expansion of the mucosa with S100p positive cells with spindly nuclei and indistinct cytoplasmic borders and diagnosis of MSCH of the gallbladder was rendered

The (3+1)-dimensional Boussinesq equation: Novel multi-wave solutions

The Boussinesq equation is a partial differential equation that describes the behavior of waves in shallow water. In this paper, we address some new dynamical behaviors to the (3+1)-dimensional Boussinesq equation, which are not constructed beforehand. Various solutions namely: multi-soliton, multi-M-lump, and the hybrid soliton solutions are reported. New explored features of equation are presented graphically to better analyze the gained solutions. For different period of time multi-soliton, multi-lump solutions are plotted. The results have important applications in oceanography, geophysics, fluid dynamics, and also used to study the behavior of waves in complex three-dimensional domains, particularly in situations where the nonlinear effects are strong

ПРИМЕНЕНИЕ ФУНКЦИОНАЛЬНО-ГРАДИЕНТНЫХ МАТЕРИАЛОВ В КОНСТРУИРОВАНИИ ЦИКЛИЧЕСКИХ ОБОЛОЧЕК

This article deals with FGM for cyclic shell structure and the finite element modeling and analysis of functionally graded (FG) shell structures under self-loading. In order to study the influences of important parameters on the responses of FG shell structures, some types of cyclic shells have been considered. The responses obtained for FG shells are based on the analysis; some important results are presented and discussed for thincyclic shells.Статья посвящена функционально-градиентным материалам (ФГМ) в конструиро-вании и конечно-элементном моделировании циклических оболочек под действием собственного веса. Для исследования влияния функционально-градиентных материалов на прочность оболочек, рассмотрены некоторые виды циклических оболочек. Получены важные результаты, которые представлены и прокомментированы в стать