Effect of two-step pretreatment on cobalt contents and surface roughness of tungsten carbide substrate prior to diamond coating

Cemented tungsten carbide is the most widely used material for cutting tools. Due to extreme demands higher tool life several types of coating have been introduced to prolong the service time which include diamond coating. However cobalt binder in tungsten carbide prevents diamond to adhere well on the substrate and its content at the outer surface should be reduce to below 1%. Single step and two-step pretreatments have been studied by many researchers. But to date poor adhesion of diamond coating still an issue. In this work a two-step pretreatment was used to etch tungsten carbide with 6% cobalt (WC-6% Co) at the surface of the substrate in order to solve poor adhesion problem. First step with Murakami's reagent (2, 3, 6, and 20 minutes) and the second step of the process were carried out by etching in a solution of hydrochloric acid (30, 45, and 60 seconds) or a solution of sulfuric acid (10 seconds). The effect of them on Co cemented tungsten carbide samples in term of surface morphology, surface roughness, and cobalt removal from the surface were examined. It is found the longer Murakami etching time produces a slightly rougher surface than the shorter exposing time. Both acid solutions were used in the second pretreatment step able to reduce cobalt content to below 1% at all conditions regardless of etching time. The best combination of pretreatment process is 20 minutes Murakami etching and 45 seconds exposure time of hydrochloric acid that yields the higher surface roughness and the lowest cobalt content on the substrate surface

Enhancing Employee Engagement at a Higher Education Institution: A Leadership Development Framework

The low levels of employee engagement at a school within a Higher Education Institution is the Problem of Practice (PoP) addressed in this Organizational Improvement Plan (OIP). The results of an employee engagement survey revealed that faculty and staff yearn for feedback, mentoring, and recognition from their academic managers. The survey also indicated that academic managers lack the necessary skills and time to coach and mentor their direct reports. The principles of interpretive theory, coupled with adaptive and servant leadership are foundational elements of this OIP, and are leveraged to help address the PoP. Studies have shown that the quality of the relationship between leaders and their followers is an important antecedent of employee engagement. The latter is defined as the intellectual and emotional commitment to one’s organization which results in discretionary efforts and exhibition of passion for work in the workplace. As such, a leadership development framework is proposed to build leadership capacity of the academic managers. A combination of the Change Path Model and the Plan-Do-Study-Act Cycle will guide the implementation of this change in the organization. Once implemented, it is anticipated that the outcomes of this OIP will go beyond enhancing the levels of employee engagement. Arguably, engaged faculty are known to motivate their students, offer them timely feedback, and contribute to their success. The research and recommendations brought forward by this OIP can be adapted and adopted at other schools within the organization, or at other Higher Education Institutions

The Sustainability of Retirement System: Comparative Study and Predictive Models Based on NATIXIS Index

Retirement systems are complex tools that are part of the financial systems of countries. There are different pension systems and retirement plans around the world, from the most sophisticated actuarial system to the emerging governmentally controlled one. The goal of this paper is to analyze the current retirement security level of the United States, France, Japan, and Morocco. It also aims to create an assessment model, inspired from the Natixis Global Retirement Index, that is capable of evaluating the retirement system of a country at a specific point in time. In this paper, we use it to assess the Moroccan Retirement System. Using substantial Macroeconomic data over the period 2012-2021, the study provides a Regression model that allows to estimate the Natixis Index of Morocco to 10 Global Retirement Index with an accuracy of 94%. It also provides Neural Networks model but with a lower accuracy of 69 to 70%. Most of the changes in the retirement system aim to reduce pension expenditure as a share of the Gross Domestic product. As common factors, the three countries\u27 focus of the study increase their life expectancy and undergo great changes in disposable income and saving over generations. Variables used in the model include; Retirement Type System: Government dominated system/ Private dominated/ Hybrid, Health Care Type System, GDP per Capital in USD, Inflation Consumer Price, Interest Rate, Average age of retirement, Life expectancy, Fertility Rate, Government debt in USD, Annual Growth Rate in Population, Average Government Spending in Pension as a % of GDP, and Human development Index

Pressure Ulcers in Critical Care Units: Research Notes from the Jordanian Context

Pressure ulcer is a common problem among hospitalized patients, especially those admitted to critical care units. Limited evidence existed about this problem in this particular population worldwide and in Jordan. This paper will describe the existed literature regarding pressure ulcer within Jordanian context focusing on the critical care units. Keywords: Pressure ulcer, critical care unit, Jorda

A model of service quality aspects conveyed in hotel advertising

Advertisements play a significant role in communicating product information, guarantees and service excellence. This study aims to investigate the role played by hotel advertisements in building customers’ expectation of service quality. After a mixed qualitative and quantitative research on 14 hotel marketing officers and 228 potential customers in Jordan, collected questionnaires were subjected to an exploratory factor analysis refining study model’s dimensions; the model was inherent to study’s results which adopts that advertisements should convey a message of quality through its attractiveness (celebrity endorsement, entertainment, tangibles and appeal), credibility (reliability, promise of quality, slogan, and reasonable price) and information (imagery, risk reduction and message effectiveness). Results of the factor analysis confirmed that all dimensions’ items were loaded significantly proving their validity. Having established models’ constructs’ validity, a multiple regression was applied to assess the models’ explanation of quality conveyed by hotel advertisements; results confirmed significantly the model’s predictability with R2 =54.7%. After confirming the model’s validity and its predictability of customers’ perceived quality, recommendations were suggested to hotel managers and marketers; these to help them utilize the model’s constructs in achieving optimal communication for their service qualityLos anuncios juegan un papel importante en la comunicación de la información de productos, garantías y la excelencia del servicio. Este estudio busca investigar el papel que juegan los anuncios de hoteles en la creación de expectaciones de la calidad del servicio en los clientes. Después de una investigación cualitativa y cuantitativa mixta de 14 ejecutivos de comercialización hotelera y 228 clientes potenciales in Jordania, los cuestionarios reunidos fueron sujetos a un análisis de exploratorio de las dimensiones del modelo de estudio; el modelo era inherente a los resultados del estudio que adopta que los anuncios deben transmitir un mensaje de calidad a través de sus atractivo (apoyando celebridades, entretenimiento, materiales e intereses), credibilidad (fiabilidad, promesa de calidad, eslogan, y precio razonable) y información (imágenes, reducción del riesgo, y eficacia del mensaje). Los resultados del análisis de factores confirmaron que todas las dimensiones de los productos estaban significante mente cargadas probando si validez. Habiendo establecido la construcción de modelos válidos, se aplicó una regresión múltiple para evaluar la explicación de los modelos de calidad transmitidas por los anuncios del hotel; los resultados confirmaron significativamente la credibilidad del modelo con un R2=54.7%. Tras confirmar la validez del modelo y su credibilidad de la calidad percibida por los clientes, se sugirieron recomendaciones a la gestión del hotel y los vendedores; para ayudarles a utilizar el modelo construido para lograr un a comunicación óptima para la calidad de su servicio

On Transient heating and dynamic response to acoustic oscillation of a vaporizing droplet

International audienc

On Transient heating and dynamic response to acoustic oscillation of a vaporizing droplet

International audienc

Determination of TOF characteristics in Iranian patients

Objective: Tetralogy of fallot (TOF) is one of the most common forms of cyanotic congenital heart disease (CHD). The aim of this study was determination of demography, associated anomalies, peripheral pulmonary stenosis (PPS), blood grouping, Rh typing, operation results and complications in TOF. Material & Methods: The records of 270 patients were reviewed. These patients were admitted from 1993 to 2003, in Shaheed Rajaei Hospital. Findings: Male patients were 60.37% and females were 39.63%. Incidence of patent foramen ovale (PFO), Right Aortic Arch (RAA), coronary artery (CA) anomalies and other anomalies were 44.81%, 21.11%, 9.25% and 36.30% respectively. Single ostium coronary artery (SOCA) was the most common CA anomaly. The most common PPS was bifurcation stenosis. TOF was more common in 0 blood group patients. The mean age at the first palliative operation was 5.21 years and for TC was 7.19 years. Post surgical mortality rate was about 3% and morbidity rate, 12.18%. Conclusion: Trend toward earlier total correction (TC), and single stage early TC of TOF should be recommended as the preferred management strategy

IMAGE DETECTION IN THE AIMBOT PROGRAM USING YOLOV4-TINY

Cheats are a way for players to gain an unfair advantage. The rise of cheats in online games encourages game producers to increase the security of their games by implementing an anti-cheat system. However, the currently widely circulated anti-cheat system only monitors incoming and outgoing raw data. With the widespread use of image detection systems, we can fool most of today's anti-cheat systems. This can be done by capturing the image that appears on the screen and then processing it through the image detection system. From the process, it can be seen whether there are opponents that appear on the screen. If there is, the program will move the mouse to the place where the enemy is and shoot it. This program is built on the core of the YOLOv4-tiny image detection system