bluuebunny/crossref_metadata_2025 huggingface dataset:
Machine learned calibrations to high-throughput molecular excited state calculations
Authors: Verma Shomik , Rivera Miguel , Scanlon David O. , Walsh Aron
Published: March 2022

Understanding the excited state properties of molecules provides insights into how they interact with light. These interactions can be exploited to design compounds for photochemical applications, including enhanced spectral conversion of light to increase the efficiency of photovoltaic cells. While chemical discovery is time- and resource-intensive experimentally, computational chemistry can be used to screen large-scale databases for molecules of interest in a procedure known as high-throughput virtual screening. The first step usually involves a high-speed but low-accuracy method to screen large numbers of molecules (potentially millions) so only the best candidates are evaluated with expensive methods. However, use of a coarse first-pass screening method can potentially result in high false positive or false negative rates. Therefore, this study uses machine learning to calibrate a high-throughput technique (xTB-sTDA) against a higher accuracy one (TD-DFT). Testing the calibration model shows a ~6-fold decrease in error in-domain and a ~3-fold decrease out-of-domain. The resulting mean absolute error of ~0.14 eV is in line with previous work in machine learning calibrations and out-performs previous work in linear calibration of xTB-sTDA. We then apply the calibration model to screen a 250k molecule database and map inaccuracies of xTB-sTDA in chemical space. We also show generalizability of the workflow by calibrating against a higher-level technique (CC2), yielding a similarly low error. Overall, this work demonstrates machine learning can be used to develop a both cheap and accurate method for large-scale excited state screening, enabling accelerated molecular discovery across a variety of disciplines.
An All-Organic Photochemical Magnetic Switch with Bistable Spin States
Authors: Günther Konstantin , Grabicki Niklas , Battistella Beatrice , Grubert Lutz , Dumele Oliver
Published: March 2022

Controlling the electronic spin state in single-molecules through an external stimulus is of interest in developing devices for information technology, such as data storage and quantum computing. We report the synthesis and operation mode of two all-organic molecular spin state switches that can be photochemically switched from a diamagnetic (EPR silent) to a paramagnetic (EPR active) form at cryogenic temperatures due to a reversible electrocyclic reaction of its carbon skeleton. Facile synthetic substitution of a configurationally stable 1,14-dimethyl-[5]helicene with radical stabilizing groups at the 4,11-positions afforded two spin state switches as 4,11-dioxo or 4,11-bis(dicyanomethylidenyl) derivatives in a closed diamagnetic form. After irradiation with an LED light source at cryogenic temperatures a stable paramagnetic state is readily obtained, rendering this system a bistable magnetic switch that can reversibly react back to its diamagnetic form through a thermal stimulus. The switching can be monitored with UV/Vis spectroscopy, EPR spectroscopy, or induced by electrochemical reduction and reoxidation. Variable-temperature EPR spectroscopy of the paramagnetic species revealed an open-shell triplet ground state with an experimentally determined triplet–singlet energy gap of < 0.1 kcal/mol. The inherent chirality and the ability to separate the enantiomers turns this helical motif into a potential chiroptical spin state switch. The herein developed 4,11-substitution pattern on the dimethyl[5]helicene introduces a platform for designing future generations of organic molecular photomagnetic switches that might find applications in spintronics and related fields.
Membrane Catalysed Formation of Nucleotide Clusters and Its Role in the Origins of Life
Authors: Saha Rajlaxmi , Poduval Prathyush , Baratam Krishnakanth , Nagesh Jayashree , Srivastava Anand
Published: March 2022

One of the mysteries in studying the molecular “Origin of Life” is the emergence of RNA and RNA-based life forms, where non-enzymatic polymerization of nucleotides is a crucial hypothesis in formation of large RNA chains. The non-enzymatic polymerization can be mediated by various environmental settings such as cycles of hydration and dehydration, temperature variations and proximity to a variety of organizing matrices such as clay, salt, fatty acids, lipid membrane and mineral surface. In this work, we explore the influence of different phases of the lipid membrane towards nucleotide organization and polymerization in a simulated prebiotic setting. We calculate the free energy cost of localizing a mononucleotide, Uridine monophosphate (UMP), in distinct membrane settings and we perform all-atom molecular dynamics (MD) simulations to estimate the role of the monophasic and biphasic membrane in modifying the behavior of UMPs localization and their clustering mechanism. Based on the free-energy and diffusion data from our MD calculations, we develop a lattice based model to explore the thermodynamic limits of the observations made from the MD simulations. The mathematical model substantiates our hypothesis that the lipid layers can act as unique substrates for ‘catalyzing’ polymerization of mononucleotides due to the inherent spatiotemporal heterogeneity and phase change behavior.
Design of the thermomechanical clamp joint of materials with shape memory effect for unmanned aerial vehicle
Authors: Kupriyanova Ya. A.
Published: March 2022

Currently, materials with shape memory effect (SME) are widely utilized in the field of joining thin-walled shells. The application of SME materials in the joining of unmanned aerial vehicle (UAV) compartments makes it possible to increase the accuracy, high assembly manufacturability to perform multiple joint assembly-disassembly work and ensures the forces transfer from UAV different surfaces in compliance with the specified strength conditions. The paper considers a design technique for a detachable clamp (tape) joint, made up of SME material, of UAV small-diameter compartments. The clamp is an open shell made up of SME material. Before installation, the clamp is cooled, and the required shape is given to it. When heated, its diameter reduces to the specified to ensure tightness and absence of clearances in the design. The critical parameters were specified. They are required to solve the problem of parametric optimization of the clamp joint, whereby the joint will meet the strength requirements and have the minimum mass. Based on the calculation of a clamped joint, the calculation algorithm, that allows the calculation of tape connections for various diameters UAV compartments, was obtained. A computer model of joining in CAD Solid Works with the parameters that comply with the structural strength requirements was created. Based on geometry of the model and the properties of the stated materials, the calculation of structural mass under various values of the inclination angle of the clamp surface was carried out. The method of designing a clamp joint, made up of titanium nickel, is represented. The dependences of compartments joints strength on the clamp parameters and a set of parameters, allowing us to design the working structure of the clamp joint with the lowest mass, are found.
Freedom to Roam
Authors: Brinkmann Matthias
Published: March 2022

Some European countries legally recognise a “right to roam”—a right to freely traverse across land, even if privately owned. Political philosophers have paid little attention to the right, and have often conceptualised property rights to include strong claim-rights to exclude others. I offer an account of the right to roam, and consider whether it can be philosophically justified on a left-liberal account of property. After finding a defence in terms of the interests served by the right lacking, I suggest that the most promising defence of the right to roam is that it serves as a symbolic reminder of a fundamental type of social equality.
Is Epistocracy Irrational?
Authors: Gibbons Adam
Published: March 2022

Proponents of epistocracy worry that high levels of voter ignorance can harm democracies. To combat such ignorance, they recommend allocating comparatively more political power to more politically knowledgeable citizens. In response, some recent critics of epistocracy contend that epistocratic institutions risk causing even more harm, since much evidence from political psychology indicates that more politically knowledgeable citizens are typically more biased, less open-minded, and more prone to motivated reasoning about political matters than their less knowledgeable counterparts. If so, perhaps epistocratic institutions will perform worse epistemically than corresponding democratic institutions. Call this 'the problem of epistocratic irrationality'. This paper argues that the problem of epistocratic irrationality can be overcome. First, I argue that critics of epistocracy have overlooked several complications regarding the psychological data they claim shows that more knowledgeable citizens are less politically rational. Second, I argue that appropriately designed epistocratic institutions could overcome the problem of epistocratic irrationality even if such critics have interpreted the data correctly. I first explore whether refined selection mechanisms could allow epistocrats to avoid empowering less rational citizens, before assessing the prospects of implementing only those epistocratic institutions with a solid track record of reliable performance.
Access to safe, timely and affordable surgical, anaesthesia and obstetric care in Pakistan: a 16-year scoping review
Authors: Ashraf Muhammad , Vervoort Dominique , Rizvi Syeda , Fatima Irum , Shoman Haitham , Meara John G. , Samad Lubna
Published: March 2022

Background: Very little is known about the state of surgical, anaesthesia and obstetric care in Pakistan. Aims: This study aimed to assess the literature available on surgical, anaesthesia and obstetric care in Pakistan to understand the strengths and weaknesses of this care based on the domains of the framework of national surgical obstetric anaesthesia plans, namely: infrastructure, workforce, service delivery, information management, governance and service delivery. Methods: Relevant studies in English published between 2003 and 2018 were identified by searching electronic databases including PubMed/MEDLINE, EMBASE and Scopus. Searches of the grey literature were also done for documents of various organizations. Thematic content analysis was conducted to collate, summarize and analyse the data. Results: A total of 2347 studies were identified and screened, of which 57 articles met the inclusion criteria. While national-level surveys, reviews and policy documents provided an understanding of the existing surgical, anaesthesia and obstetric care services in the country, most of the studies were limited in their scope and therefore were not representative of the situation at the national level. In terms of surgical, anaesthesia and obstetric care, the health care infrastructure, availability of services, workforce, financial protection, information management and governance frameworks have failed to develop at the same pace as the needs of the ever-growing population in Pakistan. Conclusions: Our findings can be used to guide future research activities as part of efforts to strengthen the surgical system in Pakistan. Recent government initiatives hold promise for future improvement in access to surgical care.
Reasons for individual and concurrent use of vaped nicotine and cannabis: their similarities, differences, and association with product use
Authors: Smith Danielle , Kozlowski Lynn , O'Connor Richard , Hyland Andrew , Goniewicz Maciej , Collins Lorraine
Published: March 2022

Background: Understanding similarities, differences, and associations between reasons people use vaped nicotine and cannabis may be important for identifying underlying contributors to co-use. Methods: A cross-sectional survey of n=112 co-users of vaped nicotine and cannabis was conducted in 2020. Participants reported on their use of nicotine and cannabis products (vaped and smoked), along with reasons for individual product use, nicotine-cannabis co-use, and engagement with sequential use and co-administration. Results: Cannabis vaping and smoking exhibited similar ratings for user experience and product/substance-related reasons for use. Reasons related to product utility were similar for cannabis vaping and nicotine vaping. Ratings for utility-related reasons for use were significantly higher for cannabis vaping than cannabis smoking (mean (SD):3.6(±1.0) vs. 2.6(±1.2), difference=0.98, t=7.84, p<0.0001). Harm reduction-related reasons for use were rated higher for nicotine vaping than cannabis vaping (2.4(±1.6) vs. 1.8(±1.4), difference=0.65, t=4.24, p<0.0001). Regression models showed higher ratings for utility-related and harm reduction-related reasons for nicotine vaping were significantly associated with more frequent nicotine vaping (both p<0.05). Greater endorsement of instrumentality-related reasons for co-use corresponded with more frequent monthly nicotine vaping and a three-fold increase in odds of ever chasing cannabis with nicotine. Conclusions: Vaping serves purposes that differ by substance; nicotine vaping was more closely related to reducing tobacco smoking-related harms, and cannabis vaping was more closely related to circumventing social problems posed by cannabis smoking. Lifetime sequential co-use practices and more frequent nicotine vaping were associated with enhancing the intoxicating effects of cannabis. Findings have implications for understanding nicotine and cannabis co-use.
Trends in cannabis use among US adults amid the COVID-19 pandemic
Authors: Brenneke Savannah , Nordeck Courtney , Riehm Kira , Schmid Ian , Tormohlen Kayla , Smail Emily , Johnson Renee , Kalb Luther , Stuart Elizabeth , Thrul Johannes
Published: March 2022

Background: The COVID-19 pandemic has had an impact on mental health and alcohol use in the US, however there is little research on its impacts on cannabis use. Considering the role of cannabis as a coping strategy or self-medicating behavior, there is a need to understand how individuals who use cannabis have adapted their use amid the pandemic. Therefore, this study examined changes in self-reported cannabis use among US adults in the context of COVID-19 pandemic by (1) describing trends of use during the first 8 months of the pandemic among adults who used cannabis in this period; and (2) characterizing trajectories of use within sociodemographic subgroups and by state cannabis policy status. Methods and Findings: The sample consisted of 1,761 US adults who used cannabis at least once during the 8 month study period from the nationally representative Understanding America Study. Linear mixed-effect models were used to model changes in the number of days of past-week cannabis use across 16 waves from March 10, 2020, to November 11, 2020. Compared to early March, the number of days cannabis was used per week was significantly higher at the start of April (β=0.11, 95% CI=0.03, 0.18) and May (β=0.21,95% CI=0.05, 0.36). In subsequent months (June - November), the number of days of cannabis use returned to levels comparable to early March. Trajectories of cannabis use across the study period generally did not differ across sociodemographic groups. Conclusions: In the US, adults who used cannabis reported statistically significant increases in cannabis use days at the start of the pandemic (April - May 2020), compared to March 2020, in the overall sample and among several sociodemographic groups. In Summer and Fall 2020, cannabis use days attenuated to levels comparable to March. Though increases in use were marginal among many groups, the evolving pandemic and the growing concern for the mental health of segments of the U.S. population warrant close monitoring of coping behaviors, including substance use.
Distress Tolerance and Hazardous Cannabis Use: Does the Form of Cannabis Matter?
Authors: Sotelo Melissa , Cservenka Anita
Published: March 2022

Objectives. Among cannabis users, low distress tolerance may result in greater vulnerability for hazardous cannabis use and cannabis use disorder. Although this relationship has been reported in the past, the role of primary form of cannabis used has not been examined as a moderator of this association. While marijuana flower remains the preferred form of cannabis used, there has been an increasing popularity of other forms of cannabis, including concentrates and edibles. The aim of the current study was to examine the association between distress tolerance and hazardous cannabis use, as well as to determine whether the primary form of cannabis used would have a moderating effect on this relationship. Methods. Participants completed a survey on cannabis use, including questionnaires on distress tolerance and hazardous cannabis use. 695 (67.60% male) past-month cannabis users were included in the current analyses. Multiple linear regressions were used to assess whether distress tolerance, primary form of cannabis used, and their interaction were associated with hazardous cannabis use, while controlling for covariates such as demographic variables and past 30-day alcohol and cannabis use frequency. Results. There was a significant regression equation (F(13, 681) = 33.31, p < .001, R2 = 0.39) that included a main effect for distress tolerance (b = 0.64, p < 0.001), indicating that lower tolerance for distress was significantly related to hazardous cannabis use. There was also a main effect for primary form of cannabis used, where preference for using concentrates compared to marijuana flower was associated with hazardous cannabis use (b = 1.38, p = 0.006), preference for using marijuana flower compared to edibles was associated with hazardous cannabis use (b = -4.39, p < 0.001), and preference for using concentrates compared to edibles was associated with hazardous cannabis use (b = -5.76, p < 0.001). Furthermore, the primary form of cannabis used significantly moderated the relationship between distress tolerance and hazardous cannabis use (F(2, 681) = 3.77, p = 0.024, R2 change = 0.01). Specifically, the relationship between low distress tolerance and more hazardous cannabis use was moderated by preference for marijuana flower (b = 0.64, p < 0.001) and concentrates (b = 0.69, p < 0.001), but was not moderated by preference for using edibles as the primary form of cannabis (b = 0.18, p = 0.25). Conclusions. By determining which particular cannabis users have the strongest relationship between lower tolerance for distress and hazardous cannabis use, these findings can help inform interventions geared towards aiding individuals to better tolerate stressful situations so as to minimize their hazardous cannabis use.
Israel: the land of milk, honey and cannabis
Authors: Shoshan Stacy , Levy Iris , Rosca Paola
Published: March 2022

Cannabis use in Israel has escalated exponentially leading to paralleled increases in psychiatric disorders and admissions to residential drug treatment facilities. Our data from the Israeli Ministry of Health Department for the Treatment of Substance Abuse shows that mental and behavioral disorders due to cannabis use have gone up 825% between 2010 and 2019. Also in 2019, amongst drug and alcohol residential treatment centers, where polysubstance use has become the norm, cannabis was reported as the primary substance leading to treatment admission. 52% of those admitted to treatment listed cannabis as their drug of choice, with a huge gap between cannabis and alcohol in second place at 21%. These statistics are particularly concerning since cannabis is currently available not only in the black market and online in Israel, but also as "medical cannabis." The most alarming issue is that Israel will most likely become the 3rd nation in the world to officially legalize cannabis within the next year.
Do consumers seek out terpenes in their vaping products? Findings from a pilot study of concurrent vapers of nicotine and cannabis
Authors: Smith Danielle , Collins Lorraine , Kozlowski Lynn , O'Connor Richard , Hyland Andrew , Goniewicz Maciej
Published: March 2022

Background: Terpenes are aromatic compounds found in nicotine and cannabis vaping products. Terpenes are promoted by the cannabis industry as having beneficial health effects, yet the evidence on this topic is still evolving. We examined whether vapers consider terpenes as a factor in their cannabis purchasing decisions, and their awareness of terpenes in their vaping products. Methods: We used Amazon Mechanical Turk to administer a survey on nicotine and cannabis use to 112 concurrent vapers of both substances, who resided in legal cannabis policy environments. Participants were asked to select from a list of 14 non-mutually exclusive factors that influence their cannabis purchases, including terpene content. Those who endorsed terpenes as a factor in their cannabis purchases were asked to identify specific terpenes they sought. A subset of vapers who used cannabis e-liquids (n = 86) were asked to identify ingredients present in their products from a list of six pre-specified constituents, including terpenes. Responses were assessed using descriptive statistics. Results: The top five factors influencing cannabis purchasing decisions were THC content (83%), price (79%), smell/taste (59%), availability (58%), and strain (47%); terpene content ranked 11th (13%) out of the list of 14 purchase-related factors. Among those who sought out terpenes (n = 13), most reported seeking products containing limonene (67%), terpinolene (40%), myrcene (40%), and linalool (33%). Terpenes were the most frequently reported individual e-liquid constituent among participants who vaped cannabis oils in an e-cigarette, with nearly one-quarter (24%) of participants selecting this option. Conclusions: In this sample of co-users, most vaping consumers did not cite terpenes as a major factor in their cannabis purchases. Among the few who did, limonene was the most commonly sought after terpene, which is also present in many nicotine containing e-liquids. Nearly one-quarter of those vaping cannabis oils reported awareness of terpenes as a constituent in their vaping product. Findings support monitoring consumer awareness of terpene-containing products as well as any increases in use as the cannabis vaping market evolves.
Young adults’ perceptions of cannabis risks, benefits, and quality of life by chronic pain status
Authors: Shorey-Fennell Bethany , Magnan Renee , Ladd Benjamin , Fales Jessica
Published: March 2022

Many young adults experience chronic pain and may be more likely to self-medicate with cannabis. The present study examined perceptions of personal risks and benefits of cannabis use among young adult users, assessed if these perceptions varied by chronic pain status, and identified relationships among perceived risks and benefits, health-related quality of life, and cannabis-related problems. Young adult regular cannabis users (n=176), half of whom met criteria for chronic pain, reported their perceptions of lifetime risks and benefits associated with cannabis use, as well as their physical and mental health-related quality of life and cannabis-related problems. Overall, participants perceived low risk associated with their cannabis use and moderate benefits. Perceived risks and benefits of cannabis use were associated with mental, but not physical health-related quality of life. Only perceived risk was associated with cannabis-related problems. Cannabis use, problems, risks, and benefits did not differ by chronic pain status. As expected, young adults without chronic pain reported better physical and mental health-related quality of life than those with chronic pain. Finally, chronic pain status moderated the relationships between perceived benefits and physical health-related quality of life and cannabis problems. The current study offers insight into the role of perceived risks and benefits in young adults’ cannabis use and associations with physical and mental health outcomes. The effects of perceived benefits on physical health-related quality of life and cannabis-related problems may be conditional based on chronic pain status. Future research should further explore the relationship of perceived benefits of cannabis use on health outcomes and cannabis-related problems.
ANÁLISE DE NARRATIVAS (AUTO)BIOGRÁFICAS DE LICENCIADOS EM GEOGRAFIA: REFLEXÕES SOBRE IDENTIDADE DOCENTE E EPISTEMOLOGIA DA CIÊNCIA
Authors: Broilo Juliana Schwingel , Menezes Victória Sabbado , Dambrós Gabriela
Published: March 2022

O olhar para o conhecimento orienta as ações, sendo indispensável para a profissão docente ter domínio sobre as bases filosóficas da ciência que se ensina, bem como dos seus próprios sentidos de educação e de docência. Com o objetivo de analisar as concepções epistemológicas da Geografia, enquanto ciência e disciplina escolar, manifestadas em narrativas (auto)biográficas de licenciados na UFPel/RS, a presente pesquisa se realizou em três etapas: levantamento do referencial teórico; coleta de dados com entrevistas narrativas; e análise dos dados produzidos. Como principais resultados se constatou a escassez de reflexões autorreferentes quanto à epistemologia da ciência e, também, um quadro de desorientação epistemológica devido a utilização de concepções contraditórias para justificar determinados posicionamentos.
Instructional Leadership Models in Modern Schools
Authors:   Higher School of Economics National Research University, Moscow, Russia, Kasprzhak Anatoly , Kobtseva Anna ,   Higher School of Economics National Research University, Moscow, Russia, Tsatrian Marina ,   Higher School of Economics National Research University, Moscow, Russia
Published: March 2022

The tool developed by Hallinger (PIMRS) has been widely used to identify the level of involvement of a school principal and his/her management team in instructional leadership. PIMRS unfolds the domains which principals delegate to their team, domains that are of a priority for the leadership team when drawing up the school’s instructional leadership profile. However, no studies have been conducted aimed at identifying instructional leadership models based on the profiles obtained by applying PIMRS. Cluster analysis (Ward’s method) was carried out to identify the instructional leadership patterns of 120 schools in one of the megacities of Russia. Four instructional leadership models were identified, and recommendations were provided.
ANALISIS PEMUNGUTAN RETRIBUSI PASAR GUNA MENINGKATKAN EFEKTIFITAS PENDAPATAN DAERAH KABUPATEN PAMEKASAN
Authors: Rachmawati Ria
Published: March 2022

The purpose of this study was to analyze the activities of collecting market levies in order to increase the effectiveness of those applied to the Pamekasan Regency Industry and Trade Office and Regional Regulation No. 13 of 2012 concerning Market Levies. This type of research uses descriptive quantitative. This type of data uses quantitative data. The data source uses secondary data. The data collection technique uses documentation techniques in the form of local revenue reports and the stages of data analysis used by identifying market retribution collection activities, effectiveness analysis, growth analysis and trend analysis. The results showed that the activity of collecting retribution at the Department of Industry and Trade of Pamekasan Regency was in accordance with the Regional Decree of Pamekasan Regency Number 13 of 2012 concerning Market Retribution, so that the researchers considered that the activities of collecting Market Retribution at the Department of Industry and Trade of Pamekasan Regency had been effective. Based on the calculation of the effectiveness analysis of the industrial office, it has been effective. The growth of market retribution revenue has decreased significantly every year. Meanwhile, the average percentage growth for 3 years shows that every year the Department of Industry and Trade has not been maximized for collecting market levies so that the growth rate has not been met.
“GRAND STYLE” IN BOSPORAN ART: EVIDENCE, ORIGINS AND DEVELOPMENT
Authors:   Moscow State Academic Art Institute named after V. I. Surikov at the Russian Academy of Arts, Savostina Elena A.
Published: March 2022

Among the objects of greek art of the Bosporan production, greek archaic art basis is quite clearly observed. We can interpret it as the preserva- tion of early aesthetic ideas in the perception of plastic form, a certain “manner of vision”, transferred with the Hellenic impulse to a new environment in the C. 6 BC. Over time, the plastic manner was modified, but the “archaic trace” in the sculpture was preserved. Undoubtedly, it became the defining basis of a peculiar local form, which was gradually filled with elements learned from subsequent masters of the new “classical” schools. A relief with a battle scene (Pushkin State Museum of Fine Arts) turned out to be a kind of key to understanding the bright variety of local art, which was proposed to be distinguished and designated as the “Bosporan style”. We can also refer to it a number of other monuments of monumental sculpture, both of the late 6 th and 4 th centuries BC, and later, including the widespread Bosporan tombstone steles of the Hellenistic and Early Roman era. There are reasons to assume the existence of the Bosporan style in the forms of architectural deco- ration, and in torevtik (gold objects from the Donetsk and Stavropol mounds: Perederieva Mogila and the mound, excavated in 2013 in Stavropol), and even in small forms – terracotta plastic – this style is reflected: the statuette of a horse- man from the Pushkin State Museum of Fine Arts in the composition, flattened surface of the relief and characteristic details resembles the style of the Bosporan steles of late Hellenism. All this translates the phenomenon under consideration into the status of the so-called “Grand Style”, that is, an artistic manner that manifests itself in various categories of culture and for several centuries has de- termined the expressive appearance of the Bosporan environment.
12TH CENTURY GUSLI WITH ZOOMORPHIC DECORUM FROM NOVGOROD: WESTERN EUROPEAN ANALOGIES AND POSSIBLE SYMBOLIC MEANING
Authors:   Charitable Foundation “The Private Museum of Russian Icon”, Slapinia Anna A.
Published: March 2022

The article is devoted to the decorum of the wooden gusli (psal- tery) found during archaeological excavations in Novgorod the Great in 1969. This artefact, dated from the first half of 12 th century, is decorated with two carved dragon’s heads. Also there are depicted graffiti carvings: one with drag- on’s heads and another one with a lion and a bird. The similarity between caved dragon’s heads at gusli from Novgorod and decorum of Western European medieval musical instruments (citoles and harps) is found. There is mentioned in the article that images of harps with zoomorphic decorum are known from miniatures with King David depicted in medieval illuminated psalters. Also it is found that the graffiti with a lion and a bird has iconographic parallels in the stone carvings with King David on the walls of the Church of the Interces- sion on the River Nerl (1165) situated near the city of Vladimir in Russia. Therefore a hypothesis about reflection of King David’s theme in the decorum of gusli from Novgorod is expressed.
“CHRIST PANTOCRATOR” OF THE 13TH CENTURY FROM THE COLLECTION OF RUBLEV MUSEUM IN THE CONTEXT OF GREEK-RUSSIAN RELATIONS
Authors:   Russian State University for the Humanities, Etinhof Ol’ga E. ,   Research Institute of Theory and History of Fine Arts  of the Russian Academy of Arts
Published: March 2022

It still seems to me correct to date the icon “Christ Pantocrator” from the Rublev Museum back to around 1200 or to the first quarter of the 13th century, that is, the pre-Mongol period. Masterfully painted, but far from the refined roots of the Constantinople style, the icon bears clear signs of the art of Northern Greece and Macedonia, and the tradition of Kastoria seems to be especially close. The origin of the object remains unclear; it could have been the work of both a Greek and a Russian master. However, even if we consider both the icon board and its painting to be by Russians, it is very close to Byzantine art, and precisely of this region. Probably, such closeness is an indication of the influence of Northern Byzantine art on the development of regional features of the painting of 13th century North-Eastern Russia.
Rancangan Dasar Perhitungan Proteksi Katodik dengan Menggunakan Anoda Korban Pada Struktur Baja Anjungan Minyak di Lingkungan Air Laut
Authors: Goffar Abdoel
Published: March 2022

Pembuatan dokumen setiap pekerjaan proyek adalah sangat penting. Penelitian denganperhitungan rancangan dasar proteksi katodik anoda korban pada pile di anjungan lepas pantaidilakukan dengan membuat laporan sebagai dokumen. Dokumen ini berisi laporan yang tersusunsecara sistematika dengan menerangkan pekerjaan proyek meliputi rekayasa dasar untukperhitungan proteksi katodik dan menggunakan anoda korban (sacrificial anode) untuk melindungikorosi pada tiang baja (steel pile) anjungan minyak di lepas pantai. Paper ini menunjukkan tahapanmerancang proteksi katodik sesuai dengan standar dan spesifikasi dari salah satu perusahaanmilik negara Eropa yang beroperasi di Indonesia. Rancangan meliputi perhitungan secara telitikebutuhan arus pile dari anjungan minyak (platform) di lingkungan air laut (lepas pantai). Kerjasama tim insinyur dari berbagai disiplin ilmu yang masing-masing memiliki data lapangan kemudianterkumpul dalam beberapa arsip (file) dalam komputer yang sebagai jejaring (network), sehinggamemudahkan perolehan data secara lengkap. Selain dari pada itu dibutuhkan juga gambar autocadguna mengetahui keadaan sebenarnya instalasi terhadap tiang pancang (pile) anjungan yangdiproteksi katodik. Perhitungan dilakukan dengan menyusun tabulasi secara sistematis danmemudahkan perhitungan dalam komputer secara cepat,sehingga menjadi praktis dan efisien.Hasil dari perhitungan dapat memberi penjelasan terhadap kebutuhan arus pada pile danmemudahkan koreksi apabila ada kesalahan dengan memasukkan semua parameter yang diketahui.Rancangan ini dikenal dengan rekayasa dasar (basic engineering) agar anoda yang tersediadapat memenuhi kebutuhan arus tiang pancang (pile) yang telah ditentukan hingga 20 tahun danmemastikan sistem berjalan sesuai rancangan.
Geologi Penginderaan Jauh Dalam Studi Evaluasi Lahan Migas di Cekungan Kutei Atas Bagian Utara
Authors: Suliantara Suliantara
Published: March 2022

Cekungan Kutei Atas Bagian utara terletak di Hulu Sungai Mahakam, Hulu Sungai Sangata,Sungai Bungalon, dan Sungai Marah Kalimantan Timur. Kegiatan eksplorasi migas telah banyakdilakukan akan tetapi belum menemukan cadangan yang signifikan. Studi ini bertujuan untuk mengetahuikondisi geologi permukaan, digunakan beberapa jenis citra satelit, yaitu citra PALSAR, CitraLandsat, dan Citra SRTM. Perangkat lunak pengolah citra professional Envi 4.0 dan ERMapper7.0 diaplikasikan atas data citra sehingga menghasilkan citra yang memberikan informasi kondisigeologi. Hasil pengolahan ketiga citra yang mampu memberikan informasi kondisi geologi daerahkajian dikelola dalam basis data sistem informasi geografi (SIG) dengan sistem koordinat WGS’84.Interpretasi secara simultan terhadap data citra tersebut menghasilkan informasi geologi yang berupasatuan batuan dan struktur geologi pada perangkat lunak Map Info. Interpretasi geologi daerahkajian menghasilkan peta geologi penginderaan jauh, yang memperlihatkan dua puluh empat (24)satuan batuan, struktur lipatan yang berarah relatif utara – selatan, dan sesar yang berarah relatifbaratlaut – tenggara dan utara – selatan. Daerah Muara Wahau – Muara Marah dan Daerah Ritan –Muara Bengkal berpotensi untuk eksplorasi migas lanjut. Kombinasi citra satelit PALSAR, SRTM,dan Landsat mampu meningkatkan perolehan informasi geologi dalam kegiatan Kajian EvaluasiLahan Migas di Cekungan Kutei Atas Bagian Utara.
Definite Integral of Logarithmic Trigonometric Functions Expressed in terms of the Incomplete Gamma Function
Authors: Reynolds Robert , Stauffer Allan
Published: March 2022

We present a method using contour integration to derive definite integrals and their associated infinite sums which can be expressed as a special function. We give a proof of the basic equation and some examples of the method. The advantage of using special functions is their analytic continuation which widens the range of the parameters of the definite integral over which the formula is valid. We give as examples definite integrals of logarithmic functions times a trigonometric function. In various cases these generalizations evaluate to known mathematical constants such as Catalanâ€™s constant and Ï€.
Analytical Study for Certain Ordinary Differential Equations with Variable Coefficients via GÎ±-Transform
Authors: Prasertsang Patarawadee , Sattaso Supaknaree , Nonlaopon Kamsing , Kim Hwajoon
Published: March 2022

GÎ±-transform, which is a comprehensive and essential form of Laplace-type integraltransforms, has both advantages and limitations. The purpose of this study is to consider the applicable range of GÎ±-transform in finding solutions of ordinary differential equations with variable coefficients. Finally, several examples are given to demonstrate the effectiveness of these results.
Upper and Lower almost Weak (Ï„1, Ï„2)-continuity
Authors: Boonpok Chawalit , Viriyapong Chokchai
Published: March 2022

The purpose of the present paper is to introduce the notions of upper and lower almost weakly (Ï„1, Ï„2)-continuous multifunctions. Several characterizations of upper and lower almost weakly (Ï„1, Ï„2)-continuous multifunctions are investigated.
Coincidence and Common Fixed Point Theorems in Gb-Cone Metric Spaces
Authors: Benchabane Saadia , Djebali Smail
Published: March 2022

In this article, some coincidence and common fixed point results were obtained for four mappings satisfying some special contractive conditions and defined on a G_b-cone metric space (with or without the assumption of normality). Our results generalize recent results in the literature. Two illustrative examples are included and some consequences are supplied.
On k-Cost Effective Domination Number in the Join of Graphs
Authors: Palco Jesrael Bataluna , Paluga Rolando N. , Malacas Gina A.
Published: March 2022

In this paper, we characterize the k-cost effective domination in the join of graphs.Further, we investigate the k-cost effective domination, cost effective domination index, maximal cost effective domination in the join of graphs.
A Quadruple Integral Involving the Hermite Polynomial Hn(x): Derivation and Evaluation
Authors: Reynolds Robert , Stauffer Allan
Published: March 2022

A closed form expression of a quadruple integral involving the Hermite polynomial $H_{n}(x)$ is derived. Special cases are expressed in terms of special functions and fundamental constants. All the results in this work are new.
MODELING AND SIMULATION OF A DUAL CHANNEL ACTIVE NOISE CONTROL SYSTEM FOR POWER TRANSFORMER USING FXLMS ALGORITHM
Authors: SUNDAY ADETONA , RAIFU SALAWU , MORUF ALABI
Published: March 2022

Power transformers are known to generate noise, however, active noise emanating from power transformers many at time is unbearable and has been a subject of concern overtime in power engineering. Several studies on it have principally centered on single channel active noise controller (scANC) using fixed step size, which are characterized with the problems such as signal congestion and instability. This study, therefore, employed Filtered-X Least Mean Square (FXLMS) on a dual channel active noise controller (dcANC) using variable step-size. The noise emanating from a 100 MVA, 132/33 kV power transformer was captured with the help of a smart phone in flight mode in accordance with IEC 60076-10 standard of 2 m away from the transformer and 1 m apart between each measurement. The recorded noises were taken at one-third of the height of the transformer tank, while electromagnetic interference from the phone and others were assumed to be negligible. A dcANC with FXLMS was model mathematically and implemented in Simulink in the MATLAB environment. Noise reduction ratio, loudness unit full scale and mean square error were used as performance metrics. The simulation results obtained showed that the original noise emanating from the power transformer when ANC was not used was found to be 70 dB. When scANC with FXLMS was used, the noise was reduced to 30.55 dB whereas, when dcANC with the FXLMS was employed it was reduced to 0.19 dB. Also, the MSE value of -72 dB was obtained in the proposed dcANC with FXLMS, compared with -64 dB obtained from scANC with FXLMS algorithm. The results of the simulation using FXLMS on both scANC and dcANC showed that the performance of the dcANC is comparatively better in term of the stated performance metrics.
OPTIMIZATION OF SINGLY REINFORCED BEAM DESIGN USING SIMULATED ANNEALING
Authors: OLAWALE SIMON OLAYIWOLA ADEREMI , AKINTUNDE OLUTOSIN PETER , AFOLABI MOSES OLADIPUPO , AGBEDE OLUWOLE AKINYELE , FADIPE OLUSOLA OLAYEMI
Published: March 2022

This paper investigated the optimization of a singly reinforced concrete beam using the simulated annealing. The enhancement of minimum cost of structures and the adoption of the algorithm method of simulated annealing were projected in resolving the complications of constraints associated with optimization problems. The variables are the width, depth, compression steel, tension steel, and cost. The constraints are steel ratios, ultimate moment of resistance, maximum and minimum area of reinforcements while materials costs are considered as the objective function. It is demonstrated that using the concrete compressive strength of 25MPa, simulated annealing can be used to optimize the design of concrete beams effectively. The results also indicate that the complications connected to the actual and genuine evaluation of costs of structures and the connectivity with the compulsory restraints can be adequately resolved using this method.
AN ENHANCED MULTIMODAL BIOMETRIC SYSTEM BASED ON CONVOLUTIONAL NEURAL NETWORK
Authors: OMOTOSHO LAWRENCE , OGUNDOYIN IBRAHIM , ADEBAYO OLAJIDE , OYENIYI JOSHUA
Published: March 2022

Multimodal biometric system combines more than one biometric modality into a single method in order, to overcome the limitations of unimodal biometrics system. In multimodal biometrics system, the utilization of different algorithms for feature extraction, fusion at feature level and classification often to complexity and make fused biometrics features larger in dimensions. In this paper, we developed a face-iris multimodal biometric recognition system based on convolutional neural network for feature extraction, fusion at feature level, training and matching to reduce dimensionality, error rate and improve the recognition accuracy suitable for an access control. Convolutional Neural Network is based on deep supervised learning model and was employed for training, classification, and testing of the system. The images are preprocessed to a standard normalization and then flow into couples of convolutional layers. The developed multimodal biometrics system was evaluated on a dataset of 700 iris and facial images, the training database contain 600 iris and face images, 100 iris and face images were used for testing. Experimental result shows that at the learning rate of 0.0001, the multimodal system has a performance recognition accuracy (RA) of 98.33% and equal error rate (ERR) of 0.0006%.
A REAL TIME FACE RECOGNITION SYSTEM USING ALEXNET DEEP CONVOLUTIONAL NETWORK TRANSFER LEARNING MODEL
Authors: OMOTOSHO LAWRENCE O. , OGUNDOYIN IBRAHIM K. , OYENIYI JOSHUA O. , OYENIRAN OLUWASHINA A.
Published: March 2022

. In the field of deep learning, facial recognition belongs to the computer vision category. In various applications such as access control system, security, attendance management etc., it has been widely used for authentication and identification purposes. In deep learning, transfer learning is a method of using a neural network model that is first trained on a problem similar to the problem that is being solved. The most commonly used face recognition methods are mainly based on template matching, geometric features based, algebraic and deep learning method. The advantage of template matching is that it is easy to implement, and the disadvantage is that it is difficult to deal with the pose and scale changes effectively. The most important issue, regardless of the method used in the face recognition system, is dimensionality and computational complexity, especially when operating on large databases. In this paper, we applied a transfer learning model based on AlexNet Deep convolutional network to develop a real time face recognition system that has a good robustness to face pose and illumination, reduce dimensionality, complexity and improved recognition accuracy. The system has a recognition accuracy of 98.95 %.
TRANSFER LEARNING BASED OFFLINE YORÙBÁ HANDWRITTEN CHARACTER RECOGNITION SYSTEM
Authors: OYENIRAN OLUWASHINA , OYEBODE EBENEZER
Published: March 2022

This study presents Transfer Learning-based framework through the use of AlexNet for the development of an offline Yorùbá Handwritten Character Recognition System. The system encompasses the upper and case characters of the Yorùbá language, and tonal letters that have a significant impact on the Yorùbá language. The model reported network accuracy of 82.8%, validation accuracy of 77.7%, with F1 score of 0.7795, precision of 0.7819 and Recall of 0.7771. While the average recognition time is estimated to 0.371372 seconds. Thus, the technique of deep learning has shown significant improvement when compared to other existing approaches in recognizing standard Yorùbá characters.
HETEROGENEOUS CATALYSIS USING BENTONITE-SUPPORTED Fe-Co-Ni TRIMETALLIC NANOPARTICLES
Authors: ALADE ADERIBIGBE FATAI , LATIFAT ADEWOYE TUNMISE , ISHOLA MUSTAPHA SHERIF , ALHASSAN MOHAMMED ISHAQ , BAMIDELE SAKA HARVIS , OLAWALE AJALA ELIJAH , SAMUEL OLUWASEYI SOILE
Published: March 2022

Herein, the synthesis and characterization of a bentonite-supported Fe-Co-Ni trimetallic nanocatalyst applied in transesterification reaction was reported. The synthesized heterogeneous catalyst was used to investigate the production of biodiesel by varying the reaction parameters using Box-Behnken design response surface methodology (RSM-BBD). An optimum biodiesel yield of 95.2 % was obtained at methanol to oil ratio of 10:1, reaction time of 2 hours, reaction temperature of 55  and catalyst concentration of 5 % (w/w of the oil). The biodiesel produced was later analysed using GC-MS analysis and the results shows a fatty acid methyl esters (FAME) profile that confirms the presence of biodiesel.
DIMETHYL N-CYANODITHIOIMINOCARBONATE AND TRIPHENYLPHOSPHINE OXIDE METAL HALIDE COMPLEXES: MOLECULAR CRYSTAL ELUCIDATION
Authors: DIOP MOUHAMADOU BIRAME , SARR MODOU , DIOP LIBASSE , OLIVER ALLEN G. , HUGHES DAVID
Published: March 2022

Two MX2 (M = Ni, Zn; X = Cl, Br) dimethyl N-cyanodithioiminocarbonate compounds and one CrCl2 triphenylphosphine oxide complex were isolated and elucidated by single crystal X-ray crystallography. NiCl2[(CH3S)2C═NC≡N]2 (1) features inversion-related hydrogen bonded dimers linked into chains interacting through C-H···Cl growing layers along [110] whose junction into a 3D structure is enabled by H-bonds. ZnBr2[(CH3S)2C═NC≡N]2 (2) also exhibits inversion-related H-bonded dimers. In contrast with 1, the structure of 2 comprises chains along [110], connected via C-H···Br and C-H···S into a 2D layer along [-110]. CrCl2(OPPh3)2 (3) obtaining undergone redox processes, oxidizing [CH3C(O)CH2PPh3]+ to form PPh3PO, and reducing Cr from CrVI to CrII. In the structure, each molecule is linked to height neighbors through H-bonds affording a 3D network.