Physical Sciences and Engineering

Denial of service attack was a stretch of Distributed Denial of Service Attack (DDoS). DDoS comes the largest security risks and problems facing Internet users. This risk affecting obstruct with work of any system of targeted organizations, which leads to the harassment of system customer. This attack succeeds by exploiting several weaknesses to access resources in the target organizations. The attacker exhausts all capacity of resources in a period short time. The previous method leads to the denial of using any organization's resources from any authorized user.

This work concerns an experimental study of beef drying with a mixed tunnel solar dryer with forced convection. Drying experiments were carried out at the Centre for Study and Research on Renewable Energies (CERER). The evolution of air and product temperatures as a function of irradiance and the position of the racks was studied, as well as the effect of treatment and air temperature on drying speed. The experimental curves presented in terms of reduced moisture content as a function of drying time are approximated by mathematical models of existing drying kinetics.

In the last few years, power demand has increased substantially while the expansion of power generation and transmission has been severely limited due to limited resources and environmental restrictions. As a consequence, some transmission lines are heavily loaded and the system stability becomes a power transfer-limiting factor. Flexible AC transmission systems (FACTS) controllers have been mainly used for solving various power system steady state control problems. Flexible AC transmission systems or FACTS are devices which allow the flexible and dynamic control of power systems.

The blockage of the erect muscle fascia (ESP) of the spine is a relatively recent technique that was first described by Forero et al. In September 2016. It has applications in the control of chronic pain with neuropathic component of the thoracic wall, where its original usefulness is born in metastatic rib disease and a defective bonding pathology of multiple coastal fractures. Recent anatomical and radiological research into corpses indicates that the likely site of action for such blockage is in the dorsal and ventral branch of the thoracic spinal nerves.

Background: most persons will experience acute low back pain during their lifetime. The first epi¬sode usually occurs between 20 and 40 years of age. Objectives: to investigate the effect of intermittent sitting on the lumbar range of motion of prolonged standing low back pain developers. Methods: 60 subjects participated in this study. They were randomly distributed into two equal groups; group I involved 30 subjects were stood for 15 min. and sit for 5 min. Group II involved 30 subjects where stand for 30min and sit 10 min throughout the workday for 8 hours.

The various transformations marked by social, economic and political life in the last decades, have given a prominent place to education, both in the education systems and in the institutions themselves as complex and modern organizations. In times of uncertainty, there are several proposals around education. It is also in this scenario that distance education (DE) comes to assume a fundamental role for the development of education itself.

Smartphone addiction could be described as smartphone mismanagement, mishandling and misuse. It is also being fuelled by the fear of being without a mobile phone for certain number of hours. It is a non-chemical addiction that is been driven by an Internet overuse problem thereby becoming a destructive behaviour. Smartphone addiction has the capacity to negatively affect an individual in his/her physical and mental health, relationships, productivity and academic performance.

Large battery packs composed of Lithium-Ion cells are continuously gaining in importance due to their applications in Electric Vehicles (EVs) and smart energy grids. To ensure maximum lifetime, safety and performance of the battery pack, complex embedded system architectures consisting of sensors, power electronics and microcontrollers are integrated into the pack as Battery Management System (BMS).Active cell balancing is a recently developed method that reduces losses by reducing the hardware components and providing more software control.

In this paper, we prove coincidence and common fixed point theorems for two pair of multivalued and single valued mappings in complete partial metric spaces. These results improve, extend and generalize the corresponding results in the literature. Moreover, an example is provided to illustrate the usability of main results.

Background : To increase the country's energy production, the State of Niger has built a 7MW photovoltaic solar power plant connected on grid of the Nigerien electricity company in the department of Malbaza, Tahoua region (130 58'3.54 ”North and 5031'11.95 " East). Objective: In order to analyze the operation of this plant, a study of energy production was carried out in this article. Methods: The study was based on data on energy production as a function of irradiation and temperature from January 1, 2019 to December 31, 2019.