A smart city focuses on enhancing and interconnecting facilities and services through digital technology to offer convenient services for both people and businesses. The basic infrastructure of smart cities consists of modern technologies such as the Internet of Things (IoT), cloud computing and artificial intelligence. These urban areas utilize different networks, such as the Internet and IoT, to share real-time information, improving convenience for the inhabitants. However, the reliance of smart cities on modern technologies exposes them to a range of organized, diverse, and sophisticated cyber threats. Therefore, prioritizing cybersecurity awareness and implementing appropriate measures and solutions are essential to protect the privacy and security of citizens. This study aims to identify cyber threats and their impact on smart cities, as well as the methods and measures required for key areas such as smart government, smart healthcare, smart mobility, smart environment, smart economy, smart living, and smart people. Furthermore, this study seeks to evaluate previous research in this field, establish necessary policies to mitigate these threats, and propose an appropriate model for the infrastructure associated with IT networks in smart cities.

Based on the application of phase diagram calculation technique (CALPHAD), the Fe-Nd-B magnetic materials were investigated, and alloy design and microstructure evolution concerning. According to the thermodynamic database of Fe-Nd-B ternary system, the equilibrium solidification process of Fe78Nd15B7 alloy is simulated, and we explained well the reason of this experimental phenomenon by the metastable extension of the equilibrium phase diagram.

Several studies have investigated Islamic endowment (Waqf), but less attention has been given to the application of legal principles of Islamic objectives in the regulation and management of Islamic endowments in Muslim communities. The primary focus of this study is to explore the legal implementation of Maqasidush-Shari’ah or otherwise known as the Objectives of Islamic Law, as evidenced in Islamic charitable endowments. This study employs an analytical research approach (ARA), systematic literature review (SLR) and content analysis (CA) to demonstrate and evaluate how the Waqf institution can be revitalized in contemporary times, drawing parallels with its effective implementation during the formative years of Islam, rooted in the principles of Maqasidush-Shari’ah. The results demonstrate that the efficacy of Waqf typically stems from the societal advantages it offers, derived from the safeguarding of faith, property, life, honour, and lineage, which are fundamental of Maqasidush-Shari’ah or objectives of Islamic law. The study further demonstrated that Islamic endowment has various benefits such as providing grant to the social development and interests to the public. However, various challenges such as knowledge deficit in the application of Shari‘ah principles in Waqf, lack of a developed framework for managing various types of Waqf among others are identified. Nonetheless, effective regulation and management of Waqf applications of Islamic objectives on Waqf. In conclusion, this study has underscored the significant contributions of the Islamic endowment system across various spheres, including social welfare, scientific advancements, economic prosperity, and healthcare, all of which align with the objectives of Islamic legal principles encapsulated in Maqasidush-Shari’ah. Hence, the research ultimately proposes several favourable elements that could bolster the resurgence of Waqf in contemporary times, reviving its significance and societal impact. It is therefore suggested that the stakeholders should enhance understanding of the policies, legal principles, and governance structures governing Waqf as an Islamic charitable foundation, substantiated by Islamic objectives (Maqasidush-Shari’ah).

With the wide application of the Internet and smart systems, data centers (DCs) have become a hot spot of global concern. The energy saving for data centers is at the core of the related works. The thermal performance of a data center directly affects its total energy consumption, as cooling consumption accounts for nearly 50% of total energy consumption. Superior power distribution is a reliable method to improve the thermal performance of DCs. Therefore, analyzing the effects of different power distribution on thermal performance is a challenge for DCs. This paper analyzes the thermal performance numerically and experimentally in DCs with different power distribution. First, it uses Fluent simulate the temperature distribution and flow field distribution in the room, taking the cloud computing room as the research object. Then, it summarizes a formula based on the computing power distribution in a certain range by the numerical and experimental analysis. Finally, it calculates an optimal cooling power by analyzing the cooling power distribution. The results shows that it reduces the maximum temperature difference between the highest temperature of the cabinet from 5-7k to within 1.2k. In addition, the cooling energy consumption is reduced by more than 5%.

The use of porous media to simplify the thermohydraulic of a nuclear reactor is the topic of recent research. As a case study, the rector of 200 kW installed at Missouri University of Science and Technology is modeled in this paper. To help this objective, a fundamental CFD examination was completed to supplement the neutronics investigation on the present reactor. Characteristics of thermal energy removal from a typical research reactor are modeled by numerical thermal transport in porous media. The neutron flux is modeled by the nodal expansion method. For the thermo-hydraulic part, a three-dimensional governing equation is solved by an iterative method to find the steady-state solution of fluid flow and temperature in loss of coolant condition where the heat produced in the reactor core is removed by free convection. The profiles of heat flux for various power levels are benchmarked. Pressure, temperature, and velocity contours in the power passage were assessed at 300 kW and 500 kW power levels. To reduce the computational cost, a porous media approach for the whole geometry was utilized. The numerical results agree with the experimental results. The developed model can be used for safety and reliability analysis for various loss of coolant accidents.