A review on modelling and dynamic analysis of viscoelastic rotor systems

Purpose The purpose of this study is to bring down collective information about various issues encountered in modelling of rotor systems. Design/methodology/approach The most important and basic part of “rotor dynamics” is the study related to its different modelling techniques which further involves the analysis of shaft for understanding the system potential, competence and reliability. The issues addressed in this study are classified mainly into two parts: the initial part gives out a vast overview of significant problems as well as different techniques applied to encounter modelling of rotor systems, while the latter part of the study describes the post-processing problem that occurs while performing the dynamic analysis. Findings The review incorporates the most important research works that have already placed a benchmark right from the beginning as well as the recent works that are still being carried out to further produce better outcomes. The review concludes with the modal analysis of rotor shaft to show the importance of mathematical model through its dynamic behaviour. Originality/value A critical literature review on the modelling techniques of rotor shaft systems is provided from earliest to latest along with its real-time application in different research and industrial fields.

Communication regimes in Central Asian countries: a scientific discussion

The article contains the main ideas expressed by Russian and foreign participants in the international scientific discussion on the topic «Communication regimes in Central Asian countries». The discussion was held by National Research Institute for Communications Development. Studies of communication regimes conducted on the basis of the author’s methodology revealed: (1) asymmetry of actor models of communication regimes in Central Asian countries (Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, Uzbekistan); (2) pronounced etatism and policy of state regulation and control of processes and structures of public communication; (3) specifics of social engineering of communication regimes based on securitization of issues of ethnic cultural and national identity; (4) attempts to update communication regimes that have not yet attained serious success. In the course of discussions, scientists from Central Asian countries offered their research materials and keynoted: the role of cultural and religious factors in the formation of communication regimes; the influence of the financial basis of mass media on their structure and media discourse; frequent borrowings of the content from foreign information channels. Russian experts noted: artificially accentuated problems of «historical trauma» in the information space in the Central Asian countries; changes in communication formats within the context of COVID-19; the importance of studying communication regimes in the context of ensuring collective information security, the need to develop common terms and concepts for Russia and Central Asian countries in the drawing up the legislation on communication and information.

Reinforcement-learning-based optimal trading in a simulated futures market with heterogeneous agents

This paper simulates a futures market with multiple agents and sequential auctions, where agents receive long-lived heterogeneous signals on the true value of an asset and with a known deadline. The evolution of the amount of differential information and its impact on the distribution of overall gains and the pace of truth discovery is examined for various depth levels of the limit order book (LOB). The paper also formulates a dynamic programming model for the problem and presents an associated reinforcement learning (RL) algorithm for finding optimal strategy in exploiting informational disparity. This is done from the perspective of an agent whose information is superior to the collective information of the rest of the market. Finally, a numerical analysis is presented based on a futures market example to validate the proposed methodology for finding the optimal strategy. We find evidence in favor of a waiting strategy where agent does not reveal her signal until the last auction before the deadline. This result may help bring more insight into the micro-structural dynamics that work against market efficiency.

GreenMolBD: Nature Derived Bioactive Molecules' Database

Aims: One of the most important resources for the development of new drugs is a biologically active lead compound from natural sources. Biomedical researchers and pharmaceutical companies have a high interest in plant-derived molecules that can be used for drug development. Background: The collective knowledge of plants and their phytoconstituents would be of great benefit for the researchers involved in drug design. Therefore, we developed a unique and dynamic database GreenMolBD, to provide collective information of medicinal plants such as their individual profile, chemical constituents and pharmacological evidence, along with their plant parts and extract types based on different studies. Objective: We have also provided a complete profile of each compound, their physical, quantum, drug-likeliness, and toxicity properties (48 type’s descriptor) using in silico tools. Method: 1846 associated targets, related to individual compounds that are already explored in different studies, are also incorporated and synchronized. Result: GreenMolBD is freely accessible and searchable by keywords, plant name, synonym, common name, family name, family synonym, compound name, synonym, IUPAC name, InChI Key, target name and disease name. Conclusion: This is the first evidence-based database of bioactive molecules from medicinal plants specially grown in Bangladesh, which may help to explore and foster nature-inspired rational drug discovery in the future. Our database is continuously updating with the new information.

PENEGAKAN HUKUM TERHADAP TINDAK PIDANA PENIMBUNAN OBAT-OBATAN TERAPI COVID-19

It has been almost two years since the COVID-19 pandemic devastated Indonesia. This, of course, forces the community and the government to face various problems and new polemics. However, the government did not just let go and always tried to overcome it so that the burden on the community during the Covid-19 pandemic could be lighter. This article was created to know the law enforcement carried out by the government by following applicable laws and regulations in overcoming the problem of hoarding Covid-19 therapeutic drugs and to examine the factors that influence the law enforcement process against the criminal act of hoarding Covid-19 therapeutic drugs. The research methodology used is normative legal research, centered on the use of library materials as a source of information. This research uses a qualitative approach by combining data and collective information from various sources which is then developed from a sociological point of view. The perpetrators of hoarding Covid-19 therapeutic drugs can be charged with several articles of criminal law as regulated in-laws and regulations, including Law No. 7 of 2014, Law No. 36 of 2009, and so on, with a maximum prison sentence of 10 years. However, in practice, the law enforcement process is very dependent on several factors, such as legislation, law enforcement officers, the availability of facilities and facilities, as well as the community. The Covid-19 pandemic has put people in a state of panic and the need for medicines has increased drastically, so efforts are urgently needed to deter hoarders and hope that similar incidents will not happen again. Law enforcers need to make legal breakthroughs in cracking down on drug hoarders, and also make other efforts such as revocation of permits, fines, and confiscation of stockpiled drugs to be subsequently given to people in need, also need to consider the characteristics of one case with another by following scale of stockpiling and types of drugs.Hampir dua tahun lamanya Pandemi Covid-19 telah memporakporandakan Indonesia. Hal itu tentu memaksa masyarakat dan juga pemerintah untuk menghadapi berbagai permasalahan hingga polemik baru. Namun pemerintah lantas tak lepas tangan begitu saja dan selalu berusaha untuk mengatasinya agar beban masyarakat di masa pandemi Covid-19 dapat lebih diringankan . Artikel ini dibuat dengan tujuan untuk mengetahui penegakan hukum yang dilakukan oleh pemerintah sesuai dengan peraturan perundang-undangan yang berlaku dalam mengatasi masalah penimbunan obat terapi Covid-19 serta menelaah faktor-faktor yang berpengaruh pada proses penegakan hukum terhadap tindak pidana penimbunan obat terapi Covid-19. Metodologi penelitian yang digunakan adalah penelitian hukum normatif, berpusat pada penggunaan bahan pustaka sebagai sumber informasi. Penelitian ini menggunakan pendekatan kualitatif dengan mengkombinasikan data dan informasi kolektif dari berbagai sumber yang kemudian dikembangkan dengan sudut pandang sosiologis. Pelaku penimbun obat terapi Covid-19 dapat dijerat dengan beberapa pasal hukum pidana sebagaimana diatur dalam peraturan perundang-undangan, antara lain UU No. 7 Tahun 2014, UU No.36 Tahun 2009,dan lain sebagainya, dengan ancaman hukuman penjara maksimal 10 tahun. Namun pada prakteknya proses penegakan hukum sangat bergantung pada beberapa faktor seperti peraturan perundang-undangan, aparat penegak hukum, ketersediaan sarana dan fasilitas serta masyarakat. Pandemi Covid-19 telah membuat masyarakat berada dalam kepanikan dan kebutuhan obat-obatan pun meningkat drastis, sehingga sangat diperlukan daya upaya agar para penimbun menjadi jera dan kejadian serupa diharapkan tidak terulang kembali. Penegak hukum perlu melakukan terobosan hukum dalam menindak tegas penimbun obat, dan juga melakukan upaya lain seperti pencabutan izin, sanksi denda, dan penyitaan obat-obatan yang ditimbun untuk selanjutnya diberikan kepada masyarakat yang membutuhkan, juga perlu mempertimbangkan karakteristik kasus satu dengan yang lain sesuai dengan skala penimbunan dan jenis obat-obatannya.

The content and structure of reputation domains across human societies: a view from the evolutionary social sciences

Reputations are an essential feature of human sociality and the evolution of cooperation and group living. Much scholarship has focused on reputations, yet typically on a narrow range of domains (e.g. prosociality and aggressiveness), usually in isolation. Humans can develop reputations, however, from any collective information. We conducted exploratory analyses on the content, distribution and structure of reputation domain diversity across cultures, using the Human Relations Area Files ethnographic database. After coding ethnographic texts on reputations from 153 cultures, we used hierarchical modelling, cluster analysis and text analysis to provide an empirical view of reputation domains across societies. Findings suggest: (i) reputational domains vary cross-culturally, yet reputations for cultural conformity, prosociality, social status and neural capital are widespread; (ii) reputation domains are more variable for males than females; and (iii) particular reputation domains are interrelated, demonstrating a structure consistent with dimensions of human uniqueness. We label these features: cultural group unity , dominance , neural capital , sexuality , social and material success and supernatural healing . We highlight the need for future research on the evolution of cooperation and human sociality to consider a wider range of reputation domains, as well as their social, ecological and gender-specific variability. This article is part of the theme issue ‘The language of cooperation: reputation and honest signalling’.

A Systematic Review of Domestication, Ethnopharmacological Use, Phytochemistry, Nutritional Composition, and Biological Activities of Parkia Biglobosa (Jacq.) R.Br. ex G.Don

Medicinal plants are an unceasing source of herbal medicine from which many molecules are being isolated for the treatment of various diseases. Parkia biglobosa (family; Mimosaceae), commonly known as African locust bean is an economically vivacious plant of tropical and subtropical regions, cultivated in many countries across the world. Parkia biglobosa contains a broad spectrum of phytochemicals, including polysaccharides, vitamins, minerals, enzymes, proteins, tannins, saponins, glycosides, sterols, triterpenes, saponosides, tannins, reducing compounds, coumarins, anthocyanosides, flavonosides. These bioactive components are responsible for the pharmacological properties of this auspicious plant and demonstrate its importance in daily intake and alimentation. Traditionally, different parts of the plant are used as anticancer, anti-oxidant, anti-diabetes, antibacterial activity, antifungal activity, antiinflammatory activity. In the current review, pharmacological attributes, the nutritional value of Parkia biglobosa, and the medicinal properties of its various parts have been elaborated to provide collective information on this multipurpose commercial plant