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Waste Recovery and Sustainable Development. A Case Study of Material Development from Used Tires in Africa

Smart Grid and Renewable Energy 2023年第6期14卷 107-129页

作者： Bachirou Bogno paul-salomon ngohe ekam Mohammadou Sali Dieudonné Kidmo Kaoga Abderrezak Guenounou Michel Aillerie Higher Teachers’ Training College University of Maroua Maroua Cameroon Laboratoire Matériaux Optiques Photonique et Systèmes (LMOPS) University of Lorraine Centrale Supélec Metz France National Advanced School of Engineering of Yaounde University of Yaounde I Yaounde Cameroon National Advanced School of Engineering of Maroua University of Maroua Maroua Cameroon Faculty of Technology Department of Renewable Energies University of Blida Blida Algeria

This paper outlines a mechanical transformation process for rubber recycling, demonstrating the development of a new material from used tires. With the crumbs obtained using a crusher-compactor, a novel material for the manufacture of O-rings has been developed, with properties close to those found on the market. The process includes an experimental methodology of a sulfur vulcanization system choice and the quantification of ingredients, as well as the experimental determination of cure parameters. Mechanical tests on the samples completed the work by providing the mechanical characteristics of both unaged and aged (thermo-oxidative ageing) novel material. This process has a high potential for sustainable development and industrialization, making it a valuable contribution to the recycling of rubber in African developing countries.

关键词： Sustainable Development Circular Economy Used Tires Elastomers Recycling Vulcanization Parameters

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Contribution for Efficient Planning of Millimeter Wave Frequencies: Case of the 80 GHz E-Band for High-Speed Broadband Transmissions

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Journal of Computer and Communications 2023年第11期11卷 111-148页

作者： Patrick Dany Bavoua Kenfack Alphonse Binele Abana Emmanuel Tonye paul-salomon ngohe-ekam Jacques Nyemb Nga Department of Electrical and Telecommunications Engineering National Advanced School of Engineering of Yaounde University of Yaounde I Yaounde Cameroon

Due to the very high demand for Internet data capacity from mobile and fixed customers as well as the saturation of conventional frequency bands by numerous services, many countries have opened the E band, for broadcasting services. E-band involves the creation of a significant number of links in a given area. The present work addressed the problem that arises in the context of transmission is that of assigning the frequencies of this band to these multiple transmission links. The aim of this work is to study and plan the radio links of the 80 GHz frequency and to implement them in a tool in order to define an optimal distribution on the telecommunications network by guaranteeing maximum flow of data traffic while minimizing the interference. The contribution of this work is part of its unique subject: the planning of E-band frequencies for improving the quality of service of transmission in the network of telecommunications operators. Also, it intends to contribute to the resolution of unsatisfied situations of poor planning of E-band radio frequencies in telecommunications networks. With the aim of opening several opportunities for alternative high-speed data transport solutions, our work has helped prove that E-band transmission links are very efficient with capacities in the gigabyte range.

关键词： Radio Beams E-Band Frequency Planning Microwave

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Waste Recovery and Sustainable Development. A Case Study of Material Development from Used Tires in Africa

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Smart Grid and Renewable Energy（智能电网与可再生能源） 2023年第6期

作者： Bachirou Bogno paul-salomon ngohe ekam Mohammadou Sali Dieudonné Kidmo Kaoga Abderrezak Guenounou Michel Aillerie

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Towards a New Model for the Production of Civil Status Records Using Blockchain

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Journal of Information Security 2023年第1期14卷 52-75页

作者： Tankou Tsomo Maurice Eddy Bell Bitjoka Georges ngohe ekam paul salomon Laboratory of Electrical Engineering Mechatronics and Signal Processing ENSPY1 University of Yaoundé 1 Yaoundé Cameroon

The work presented in this article focuses on document forgery. Document fraud is a generic term used to designate a fraud, a falsification of a document. The said falsification can be observed in several sectors of everyday life. For a better illustration, let’s consider a system for producing civil status forms. The birth certificate is generally the basis of any individual’s life, and if this document is falsified, it can have repercussions at several levels, particularly in the academic field, where false diplomas, false national identity cards, false passports, false marriage certificates, etc. are obtained. It is therefore demonstrated that a secure production unit for civil status forms can be beneficial to both developed and developing countries. In addition, smart contract is proposed using a private Hyperledger fabric blockchain for validation of civil status documents, and a non-state public key management infrastructure is also proposed to authenticate the nodes that will validate the transactions. This improved blockchain solves the problem of falsification of civil status documents, as false nodes can contribute to the validation of a transaction. The contribution of such a hybrid system is of paramount importance for the identity of civil status documents on the one hand and for the identity of documents in general, and the blockchain to guarantee the distributed, unforgeable, non-repudiation, transparency and disintermediation character.

关键词： Blockchain Forgery PKI Civil Status Documentary Identity

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Towards a New Model for the Production of Civil Status Records Using Blockchain

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Journal of Information Security（信息安全） 2023年第1期

作者： Tankou Tsomo Maurice Eddy Bell Bitjoka Georges ngohe ekam paul salomon

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