Optimum rescheduling of water networks for batch processes using a goal programming technique.

Batch processes are relevant to a wide variety of industries in chemical processes. In batch operations, water sources are almost not directly reused/recycled in process sinks without considering time constraints and storage tanks. However, storage tanks are usually expensive and thus a cost-effective water system has to be synthesized. Rescheduling the water network can contribute to reducing the cost of storage tanks by reducing their number and capacity. In the current research work, a goal programming is used to reschedule the water network in batch processes considering the time and storage tanks. A Mixed Integer Non-Linear Program model is introduced using the Lingo optimization program. This model is used to optimize multiple objectives, which are freshwater usage, wastewater discharge, the number and capacity of tanks, the degree of shifting streams, and the total cost of the water network. Three case studies are presented in this study to demonstrate the effectiveness of the proposed procedure, considering both single and multi-contaminants problems. The results of the first case study show a reduction in the network cost and the freshwater flowrate by 26.4% and 42%, respectively. Regarding the rescheduled water network results of the second case study, the cost is reduced by 24.6% and the freshwater flowrate is decreased by 21.8% with no requirement of storage tanks. The third case study highlights the model's applicability to multi-contaminants problem, revealing a 15.1% cost reduction and a 25.7% decrease in freshwater flow.

Emotional eating in relation to psychological stress during COVID-19 pandemic: a cross-sectional study in faculty of medicine, Tanta University, Egypt.

BACKGROUND: Stress, anxiety, and depression resulting from the COVID-19 pandemic as well as subsequent restrictive measures had a negative impact on eating behaviors. This study aimed to determine the emotional eating behaviors and the perceived stress level and to assess the relation between them among adults in the faculty of medicine during the late period of lockdown during the COVID-19 pandemic. METHODS: This was a cross-sectional study among 580 persons from the faculty of medicine, at Tanta University, Egypt conducted over a period of one month during the last period of partial lockdown (October 2020). A self-administered structured questionnaire consisted of five parts used in the study (sociodemographic factors, COVID-19-related parameters, nutrition-related information during the pandemic, emotional eating scale, and perceived stress scale). RESULTS: More than two-fifths of students, employees, and staff (45.2%, 45.5%, and 44.2%, respectively) stated that their weight increased as a result of the lockdown. 50.8% of students, 42.5% of employees, and 54.6% of staff were in the moderate emotional eating groups. Similarly, the majority of students, employees, and staff reported moderate levels of stress(84%, 80.8%, and 76.1% respectively). The total emotional eating score was positively correlated with the total perceived stress scores (r = 0.13, p = 0.001*). CONCLUSION: COVID-19 pandemic, particularly during the period of lockdown, had a negative impact on individuals' psychological stress levels and levels of emotional eating behaviors.

Physicians' attitudes and acceptance regarding COVID-19 vaccines: a cross-sectional study in mid Delta region of Egypt.

Safe and effective vaccines became an important preventive tool against novel corona virus disease infection. Physicians were prioritized for early vaccination since they are at higher risk for contagion of the infection and they might affect the general populations' uptake of the vaccine. This study aimed to examine the acceptability of COVID-19 vaccines and the underpinnings of reluctance to uptake the vaccine among working physicians in Egypt. A cross-sectional study was conducted for 3 months, recruiting 1268 physicians using a snowballing random sampling technique. A self-administered electronic questionnaire was deployed to collect related data. Of participants, 24% expressed their acceptance towards COVID-19 vaccines, 39% would wait for further review, while 36.7% did not agree to get vaccinated. Findings revealed that 22% of them were vaccinated and the significant determinants of unacceptability included age, gender, higher educational attainments, prior infection, lack of direct patients' contact, and working in rural health facilities (p < 0.05). The most common reasons beyond their reluctance were fear of the vaccines' adverse effects and the short duration of its clinical trials (60% and 49.5%). Physicians had a low intention to receive COVID-19 vaccines particularly between females, senior staff, and those who had a low self-perceived risk for the infection. Integrated approaches should be designed to address concerns and factors associated with vaccine unacceptability to reduce vaccination reluctance between physicians, hence the general population.

Social media and spreading panic among adults during the COVID-19 pandemic, Egypt.

The COVID-19 pandemic became a challenge to human well-being. The rapid spread of the coronavirus diseases with quarantine measures make people use social media platforms more than before. The bad use of social media platforms affects the mental health of users leading to spread of panic among persons. This study aimed to determine the impact of social media on spreading panic about COVID-19 among adults in Egypt. This was a cross-sectional study that enrolled 2032 participants through online snowball sampling approach conducted during May 2021 to collect data from adults in Egypt. A self-administered questionnaire was used. It consists of three sections as follows: demographic characteristics, the social media platforms employed during the pandemic, the impact of social media on study participants. Nearly half of both sexes believed that spreading news about COVID-19 on social media platforms has a major role in spreading fear among people. More than half of the study participants reported that the level of Egyptian pages on social media covering COVID-19 was not good. A total of 46% females and 30.1% of males; those with primary, preparatory, higher, and postgraduate education; and 46.7% of medical and 32.1% of nonmedical were psychologically affected. The impact of social media on spreading panic among Egyptians varies according to gender, level of education, and occupation. Therefore, social media played an important role in spreading panic during the COVID-19 pandemic.

Internet addiction among medical and non-medical students during COVID-19 pandemic, Tanta University, Egypt.

Internet addiction is one of the most growing addictive behaviors worldwide, especially among university students affecting their physical and mental health negatively. During COVID-19, accessing online books, completing assignments, and online assessments are highly recommended by universities, teachers, and students. The Internet has increasingly become a vital part of our lives, and distant online classes increase the dependency of students on the Internet. The aim of this study is to assess the level of internet addiction among medical or non-medical students in Tanta University, Egypt. This was a cross-sectional study conducted during October and November 2020. It included 373 students from the faculty of medicine and 373 non-medical students from the faculty of science. The validated (IAT-20) was used to assess the level of Internet addiction among these students. A total of 51.7% of medical students were found severe internet addicts and 43.4% of them were possible addicts compared to only 11.3% of non-medical students who were found severely addicted to the Internet and 68.9% of them were possible addicts with statistically significant difference between them. Female students of both colleges were found addicted to the Internet than males. Female medical and non-medical students suffered from severe Internet addiction more than non-medical and male ones. Appropriate awareness creation intervention strategies should be implemented to decrease the level of Internet addiction among university students and to reduce its harmful and negative consequences.

Stigma Towards Mental Illness Among Tanta University Students, Egypt.

A "mental disorder" can be defined as a "behavioral or psychological syndrome that occurs in an individual. It represents about 13% of the global disease burden which is expected increase to 15% by 2020. Moreover, by 2020, depression is expected to be second to ischemic heart disease as a contributor in the global disease burden. This study aimed to assessment of stigmatizing beliefs towards mental illness among students, in Tanta University, Egypt. The study was conducted on medical, pharmaceutical and science faculties, Tanta University, Egypt during October and November 2018. The methods were a self administered questionnaire consisted of two parts sociodemographic factors and Belief about Mental Illness Scale. The results were: the pharmaceutical students have more negative beliefs towards mental illness than other students. The study concluded that: science students showing a more positive belief towards mental illness followed by medical then pharmaceutical students.

Epidemiology of liver cancer in Nile delta over a decade: A single-center study.

BACKGROUND: In Egypt, there has been a remarkable increase in the proportion of hepatocellular carcinoma (HCC) among chronic liver diseases patients. This rising proportion may be explained by the increasing risk factors as hepatitis C virus (HCV) infection, hepatitis B virus (HBV) infection, improvement of the diagnostic tools of HCC as well as the extended survival among patients with cirrhosis to allow time for some of them to develop HCC. The aim of this study was to study the epidemiology of HCC in Nile delta over the last decade. METHODS: The study was carried out on patients diagnosed as HCC in liver cancer clinic in Tanta University Hospital, Egypt, from January 2005 to January 2015. This retrospective study reviewed the files of HCC patients with special stress on age, sex, residence, occupation, smoking, and viral markers. RESULTS: Over the last decade, 1440 HCC patients were diagnosed or referred to liver cancer clinic in Tropical Medicine Department in Tanta University Hospital from January 2005 to January 2015. The mean age of HCC patients was 56.13 ± 9.53 years. Nearly, half of the patients with HCC were smokers and quarter of HCC patients were diabetics. HBV surface antigen-positive patients were only 3.26%, and the majority of patients were HCV-Ab positive (94.86% of patients). CONCLUSIONS: In Nile delta, hepatitis C rather than hepatitis B was linked to the development of HCC in our region which may be related to the high prevalence of HCV in this area.