bluuebunny/crossref_metadata_2025 huggingface dataset:
Análise Estática e Dinâmica do Conversor CC-CC Duplo-Buck Quadrático
Authors: Sá Francieli L. , Agnol Cleiton Dal , Ruiz-Caballero Domingo , Mussa Samir A.
Published: April 2021

Neste artigo será apresentado o conversor não-isolado CC-CC duplo buck quadrático. Esta topologia possui as vantagens de robustez, confiabilidade e alta taxa de conversão estática, além da redução dos esforços de tensão nos interruptores pela metade do valor em comparação com o conversor buck quadrático convencional. A simetria topológica simplifica a análise teórica do conversor. Inicialmente, realiza-se a análise estática, apresentando as etapas de operação do conversor com suas formas de ondas. Após, apresenta-se a curva de ganho estático em condução contínua, assim como são equacionados os modos de condução para obtenção da curva da característica externa do conversor. Além do modelo estático, apresenta-se o modelo dinâmico e o controle da corrente de entrada e da tensão de saída. Por fim, é construído um protótipo de 500W, frequência de comutação de 50kHz com controle e modulação baseados em FPGA, de forma a validar a análise teórica e a curva de rendimento do conversor.
Analysis of the relationship between fetal magnetic resonance imaging indications and findings with ultrasonographic examination
Authors: AKSELİM Burak , KARAŞİN Süleyman Serkan , ŞENKUTLU KUYUCU Beril
Published: April 2021

Objectives: We aimed to examine the indications for the use of fetal MRI in obstetrics practice and the relationship between fetal MRI and ultrasonographic findings.
Methods: Seventy-three patients were examined with Fetal MRI for various reasons between July 2017 and July 2020, and whose results were available were evaluated retrospectively. Ultrasonographic and MRI findings were recorded. The detected pathologies were divided into groups according to systems. The relationship between the findings was examined.
Results: In our study, ultrasonographic findings of fifty-five (75.3%) cases were confirmed by MR findings. MRI detected additional findings in eight (10.9%) cases, most of which were intracranial pathologies. The most detected ultrasonographic findings as an indication for the request were in the intracranial region (54.8%).
Conclusions: Fetal MRI indications in perinatal care and follow-up are not clear. Determining these indications is also essential in preventing unnecessary use in obstetric practice and determining the cost-effectiveness.
Protection of the Rights of Individual Depositors in Ukrainian Banking Market
Authors: Lobozynska Sophia
Published: April 2021

The complex analysis of deposit operations of individuals in Ukraine was realized. The national legal norms of protection the rights of investors – individuals were investigated. Also the proposals were developed for the further improvement of the protection system of individual depositor rights in Ukraine by improving banking regulation and supervision, the increase of the financial sustainability of the Deposit Guarantee Fund and financial literacy of citizens.
A COMUNICAÇÃO INTERNA EM UM HOSPITAL UNIVERSITÁRIO FEDERAL DA REDE EBSERH: OTIMIZANDO O PROCESSO USANDO APRENDIZADO DE MÁQUINA
Authors: Oliveira de Carvalho Clarissa , Ramos Casimiro Alysson José , De Castro Lins Hertz Wilton , Nagem Danilo Alves Pinto
Published: April 2021

O atual contexto de inovação tecnológica digital que a indústria 4.0 trouxe, gerando um gigantesco volume de dados, traz novos desafios para a comunicação interna das organizações. Os hospitais são instituições naturalmente complexas em virtude de sua diversidade de atividades, perfis de profissionais, tipos de públicos e regulamentações a serem seguidas, sendo um exemplo de instituição com demandas de gerenciamento de dados em larga escala. O perfil organizacional dos hospitais universitários e seu papel na sociedade, instigaram a reflexão sobre a importância da qualidade das informações, a maneira como são divulgadas, bem como a forma que são recebidas pelo público interno de um hospital universitário, ou seja, sobre a eficácia na comunicação interna desse tipo de instituição, tendo em vista que esta vai impactar a todos que lidam direta ou indiretamente com pacientes, influenciando nos resultados entregues, seja na formação acadêmica ou na assistência de saúde. Porém, observa-se que os processos referentes à comunicação interna nesse tipo de organização apresentam algumas dificuldades como a falta de comunicação dirigida e interatividade entre os diversos segmentos do público interno. O objetivo deste trabalho foi verificar as necessidades e carências do público interno de um grande hospital universitário da rede Ebserh (Complexo Hospital de Clínicas da UFPR) e fazer uma proposta de utilização de inteligência artificial como instrumento para realizar a comunicação dirigida, por meio de recomendação de conteúdo. O estudo pautou-se em pesquisa bibliográfica, pesquisa quanti-qualitativa junto à amostra qualificada do público interno do Complexo Hospital de Clínicas da UFPR (formado por profissionais e residentes de todas as áreas), bem como o desenvolvimento de uma prova de conceito para recomendação de conteúdo a partir de notícias disponibilizadas nos portais do CHC-UFPR e Ebserh. Este trabalho proporcionou verificar a importância e as dificuldades que existem na comunicação interna de um grande hospital universitário, ao mesmo tempo em que demonstrou que o uso de inteligência artificial, como gestão de dados e recomendação de conteúdo, pode ser uma solução viável e promissora para essas carências inserindo esse tipo de organização na era da comunicação 4.0.
Investigar la vida en/de las organizaciones
Authors: Silva Pintos Virginia
Published: April 2021

Esta nueva publicación de InMediaciones de la Comunicación es una continuidad del Volumen 15 – Nº 1, el cual también estuvo dedicado al tema “Tendencias y desafíos de la comunicación en las organizaciones: crisis, reputación y gestión de vínculos” contó con la participación del Dr. Paul Capriotti como editor invitado. El despliegue de ambos volúmenes entona con una serie de convicciones acerca del desarrollo y el dinamismo que ha mostrado –en las últimas décadas– el amplio universo de la comunicación en las organizaciones.
Comparaison des phénotypes camelins de Mauritanie aux écotypes d’Afrique et d’Asie
Authors: Diop Abdel Kerim M. , Chrif Ahmed Mohamed S. , Biya Mohamed B. , Haki Mohamed Lemine , Konuspayeva Gaukhar , Faye Bernard
Published: April 2021

Afin d’évaluer la diversité phénotypique caméline en Mauritanie, des mensurations corporelles ont été réalisées sur 131 chamelles adultes amenées à l’abattoir de Nouakchott, animaux en provenance de l’ensemble du territoire mauritanien. En moyenne les mensurations corporelles ont été (en cm) de 51,5 ± 2,0 (longueur de la tête), 21,5 ± 1,5 (largeur de la tête), 108,4 ± 6,6 (longueur du cou), 65,6 ± 4,9 (tour du cou), 184,7 ± 8,1 (hauteur au garrot), 197,8 ± 8,2 (tour de poitrine), 147,1 ± 9,3 (longueur du corps) et 76,8 ± 5,2 (tour de cuisse). Par classification automatique, il a été possible d’identifier cinq phénotypes allant des animaux de petite taille, au petit gabarit et au cou fin et court, à des animaux longilignes de grande taille en passant par des gabarits de taille moyenne se distinguant par la grosseur de la tête ou des membres. Comparés aux données de la littérature, ces phénotypes apparaissent très proches des races décrites dans les pays du Maghreb et plus globalement des races africaines, et s’opposent aux races asiatiques, plus grandes et plus productives. La variabilité des phénotypes mauritaniens s’est avérée de faible ampleur, ce qui peut s’expliquer par la position de la Mauritanie, à l’extrémité occidentale de l’aire de répartition du dromadaire en Afrique, zone de brassage génétique important avec de faibles divergences rendues possibles par la topographie du pays.
The Excellence of Performance, Semen Quality and Testosterone Levels on Bull in Teaching Farm, Faculty of Veterinary Medicine, Universitas Airlangga
Authors: Srianto Pudji , Sardjito Trilas , Utomo Budi , Widodo Oky Setyo
Published: April 2021

Study on performance, semen quality and testosterone levels of 2 young bulls (age range 3-5 years) Limousine and Simental and 2 old bulls (age range 6-8 years) types Limousin and Simental have been carried out in the Teaching Farm, Faculty of Veterinary Medicine, Universitas Airlangga. This study aimed to determine the performance, semen quality and testosterone levels can be used as a guideline whether or not the ejaculate of young and old bulls should be continued into frozen semen. Performance tests were carried out using measuring sticks and weight bands, semen quality tests included macroscopic and microscopic tests, semen concentration using a spectrophotometer and testosterone test using the Sandwich-ELISA method. The mean results of the performance test in young bulls were, while the mean for older bulls were: body weight 700 kg; hump height 136.5 cm; circumferens of chest 213 cm; body length 171 cm and scrotal circumference 35.5 cm. The performance test for old bulls is body weight 840 kg; hump height 143 cm; circumferens of chest 225.5 cm; body length 177.5 cm and scrotal circumference 40.25 cm. Mean macroscopic of semen examination for young bulls, mean volume 8 cc; milky white color; characteristic odor; The degree of acidity was 6.5 and mucous consistency, while for the old bulls the volume was 6.85; milky white color; characteristic odor; 6.5 degrees of acidity and mucous consistency. The mean microscopic examination for young bulls was mass movement ++ / +++; individual movement 80/3; concentration 745.5 million / ml; abnormalities 3% and 92.25% viability, for old bulls: movement mass ++ / +++; individual movement 77.5 / 3; concentration 1291.5 millon / ml; abnormalities 5% and viability 90%. Examination of serum testosterone levels using the Sandwich-ELISA technique was obtained by an average of 1.299 ± 0.1598 ng/ml in young bulls and 1.101 ± 0.1502 ng/ml in older bulls. This study concluded that young bulls and old bulls in the Teaching Farm, Faculty of Veterinary Medicine, Universitas Airlangga in terms of performance, semen quality and testosterone levels are suitable for processing into high quality frozen semen.
Acanthochephaliasis in White-lipped Green Pitviper (Trimeresurus insularis)
Authors: Panjaitan Cahaya , Suprihati Endang , Yudhana Aditya , Hastutiek Poedji , Wibawati Prima Ayu , Purnama Muhammad Thohawi Elziyad
Published: April 2021

White-lipped Green Pitviper (Trimeresurus insularis) is one type of snake whose population in nature is still not extinct and has a wide spread starting from the island of Java, Bali, Komodo, Lombok, Padar, Rinca, Romang, Roti, Sumba, Sumbawa, Timor. Population decline can occur if the incidence of disease infections continues to increase, one of the most common infectious diseases is helminthiasis. This study aimed to identify and determine the level of Acathochepala infection in White-lipped Green Pitviper in Banyuwangi Regency. A total of 20 green snakes were examined for Acanthochepala infection. Identification was done when the worm had been stained using carmine. The results showed that 20 positive green snake samples were infected with Acanthochepala in the subcutan, muscle tissue, digestive tract and reproductive tract.
Administration of Palm Kernel Meal and ß-Mannanase on Laying Hens Productivity
Authors: Wicaksana Dimas , Hidanah Sri , Lokapirnasari Widya Paramita , Al-Arif Muhammad Anam , Lamid Mirni , Suprianondo Koesnoto
Published: April 2021

The aim of this research was to observe the influence of palm kernel meal and ß-Mannanase on laying hens. Laying hens up to 2500 birds were reared in opened-house cage fed with commercial feed substituted with palm kernel meal and ß-Mannanase. All hens were divided into five groups in an order P0 as control group, groups without enzyme which are P1 with 7% palm kernel meal and P2 with 14% palm kernel meal, groups with ß-Mannanase which are P3 7% palm kernel meal and P4 with 14% palm kernel meal. The observed variables are feed intake, feed cost, egg weight, egg mass, feed conversion ratio, hen day production, and mortality rate. The results indicated that threr are no significant difference from all variables. The percentage of palm kernel meal for 14% with ß-Mannanase cannot give any influence on laying hens productivity.
Detection of Fertility Levels of Female Bawean Deer (Axis kuhlii) Based on Fecal Steroid Metabolic
Authors: Rahmawati Mitha Ardila , Hariadi Mas’ud , Restiadi Tjuk Imam , Rimayanti Rimayanti , Lestari Tita Damayanti , Srianto Pudji
Published: April 2021

The aim of the study was to detect the fertility level of females Bawean deer (Axis kuhlii) through fecal steroid metabolic which were tested using Enzyme-Linked Immunosorbent Assay (ELISA). The study used five females Bawean deer in Taman Flora Surabaya, which were marked using R1, R2, R3, R4, and R5 necklaces. The feces of each deer was collected on the 1st day, 6th day, 11th day, 16th day, and 21st day. The samples which were collected then extracted using the freeze dry method. Samples were tested using ELISA. The results of the measurement of the levels of fecal steroid metabolic  in five Bawean deers showed that three Bawean deer (R1, R4, and R5) were in the luteal or pregnant phase as indicated by the increased of progesterone from 1st day to 21st day. While the other two Bawean deer (R2 and R3) were in the follicular or estrous phase as indicated by the decreased of level of faecal steroid metabolic  on 11th day for deer R2 and 16th day for deer R3. The results showed that the levels of the fecal steroid metabolic can be used to determine the follicular phase and luteal phase and the pregnancy status of female Bawean deer.
Development planning to accelerate Sustainable Development Goals (SDGs) in Mahakam Ulu Districts as a new autonomous region
Authors: Irawan Bambang , Akbar Paisal , Purnomo Eko Priyo , Nurmandi Achmad
Published: April 2021

The new autonomous regions have been seen as a burden because many have not developed into areas that can build inclusive societies. The upstream area of the Mahakam River in 2013 bring forth a new autonomous region called the Mahakam Ulu Districts, and the study aims to describe development planning in the region. This research adopts a descriptive qualitative approach using secondary data. The research results show that the newly autonomous region of Mahakam Ulu Districts is a breath of fresh air for the people of the ideals of equitable development in their regions. Development planning has also upheld the SDGs’ goals; this can be seen from the programs that have been carried out, aiming to bring the Mahakam Ulu District prosperity and justice. The transformation of the values contained in the pillars of the SDGs has also felt to be present in the annual priority programs that have been carried out by Mahakam Ulu Districts, including in terms of social development, environmental development, economic development, and legal and governance development which continue to be pursued by all parties upstream of the Mahakam River, Mahakam Ulu Districts.
Development of community-based tourism: Study in Kertayasa Village, Pangandaran Districts, West Java
Authors: Putra Rifki Rahmanda , Khadijah Ute Lies Siti , Rakhman Cecep Ucu , Novianti Evi
Published: April 2021

Kertayasa Tourism Village is one of the leading tourism villages in the Pangandaran Districts, West Java Province. It is proven by having won various awards, one of which is the champion of the advanced tourism village category in the 2019 Nusantara Tourism Village Competition. The community’s role in developing the village’s potential with sustainable tourism is one of the keys to the tourism village’s success. This study aims to identify a general description of Kertayasa Village development as a tourism village, analyze the development concept of community-based tourism, and analyze the relationship between the development concept with the Sustainable Development Goals (SDGs). The research method used is a qualitative approach with case study design and interactive model analysis techniques. The key informants in this study were selected using purposive sampling techniques, including the elements of the Kertayasa Village apparatus, community leaders, and tourism practitioners. The results showed the criteria for developing Kertayasa Tourism Village based on attractions, amenities, accessibility, and ancillary services. The development pattern is a tourist attractions cluster model (Green Canyon), which stimulates the surrounding villages’ development. The development’s characteristic is bottom-up with community empowerment’s central issue in environment, economy, and social-cultural to supports SDGs.
Reproduction of Volcanic Rituals in Appealing for the Right to Live in Disaster-Prone Zones on Mount Merapi
Authors: Hudayana Bambang
Published: April 2021

In response to the Mount Merapi eruption in 2010, the government had conducted several disaster risk reduction programs. However, the programs had ironically threatened hamlets as communities regarding their rights to practice their local knowledge and live in their home ground. This study employed a qualitative method involving five hamlets from December 2019 until February 2020. The data were collected by employing participatory observation and depth interviews, involving the ritual organizers, participants, citizens, guests, and other audience. Spirited by ritual theory as political action, this research showed that the hamlets formulated volcanic ritual reproductions into three forms which were the delegitimation of the disaster risk reduction programs, the reinforcement of Kejawen identity, and the showing off the safety and prosperity. Those reproductions were recognized by the emergence of new ritual processions in the forms of parades, pilgrimages, offerings, and enhancements of ritual formalization and celebrations. Those reproductions positively impacted the literacy and recognition from both the government and general society that those hamlets have been living a safe and prosperous life in Merapi, even though they are located in disaster-prone areas.
Development of Control Drainage Operation Model and Utilization Planning of Post-Fire Peatlands
Authors: Imanudin Momon Sodik , Bakri Bakri , Armanto M E , Wildayana E , Al Rashid S
Published: April 2021

The research aimed to determine the monthly operational groundwater control and land use patterns in fire prevention efforts on peatlands. The research method was carried out using a detailed survey scale method in the representative sample area of 20-30 ha. Observations in the field included measuring the physical properties of soils and observing hydrological components. Group discussions with the community were conducted to explore information on the causes of fires, compilation of plans for operational activities in the field, and land use models. The research results showed that in the soil depth of 0-20 cm the level of peat maturity classified as Sapric (mature), at a depth of 20-50 cm is classified as hemic and at a depth of 50-100 cm belongs to fibric (immature). The effects of blocking canal construction were very significant in raising the water level in the channel and groundwater table. However, due to the low rainfall until December 2019, the groundwater level was not yet able to raise to the point of arrangement 40 cm. Till the end of December 2019, the groundwater level was at 70 cm, however there has been an increase in groundwater level of 30 cm since the beginning of December 2019. In the rainfall conditions < 2500 mm/year, blocking canal operations with a retention system have to begin in April. Agroforestry is the best model and Albizia chinensis (Osbeck) Merr. (sengon) in combination with pineapple plants are the best land use pattern. In addition, some short-term proposals are to provide infrastructure for firefighting, the construction of a road embankment, normalization of main rivers and canals, providing boring wells, making security control posts, training, monitoring, and providing some incentives for farmers to clear land and firefighting teams at the village level.
Exploration of Swampland Plants in South Kalimantan and the Toxicity Test Against Armyworms (Spodoptera sp.)
Authors: Ilhamiyah Ilhamiyah , Ni'mah Gusti Khairun , Kinardi Ari Jumadi
Published: April 2021

This research aims  explored  swampland plants in South Kalimantan which have potential as a botanical pesticides and compared the levels of toxicity between the swampland plants extracts     against armyworms (Spodoptera sp). The exploration of plants that have the potential as botanical pesticides was carried out in the swamps of South Kalimantan, while the toxicity test was carried out in the Basic Laboratory of  the Kalimantan Islamic University of  Muhammad Arsyad Al Banjari Banjarmasin. The research  was carried out by exploring plants that have the potential as botanical pesticides carried out by collecting samples of swampland plants in South Kalimantan which are commonly used by rural communities as materials for controlling insects such as mosquitoes and plant pests, plants used for traditional medicine, plants used for kill animals for example to find fish. The plants found identified to species level, at least to the family level, then a toxicity test were carried out to determine the LC50 by probit analysis. The results of this research showed that there are 3 plant spesies of plant that have the potential as botanical pesticide, namely karamunting (Melastoma malabathricum); gelinggang (Cassia alata); and galam (Melaleuca cajuputi). The basis for the selection of South Kalimantan swampland plants is plants that are commonly used by the community as an ingredient for controlling insects such as mosquitoes and plant pests. The highest levels of toxicity between the extracts of all swampland plants in South Kalimantan to armyworms (Spodoptera sp) were galam (Melaleuca cajuputi) with 429.04 g/l of LC50; then karamunting (Melastoma malabathricum) with 447.995 g/l LC50, while the lowest toxicity was gelinggang (Cassia alata) with 498.301 g/l LC50.

 

Key words: Probit analysis, LC50, toxicity, exploration, swampland
Gröbner-Shirshov Bases Theory for Trialgebras
Authors: Huang Juwei , Chen Yuqun
Published: April 2021

We establish a Gröbner-Shirshov bases theory for trialgebras and show that every ideal of a free trialgebra has a unique reduced Gröbner-Shirshov basis. As applications, we give a method for the construction of normal forms of elements of an arbitrary trisemigroup, in particular, A.V. Zhuchok’s (2019) normal forms of the free commutative trisemigroups are rediscovered and some normal forms of the free abelian trisemigroups are first constructed. Moreover, the Gelfand-Kirillov dimension of finitely generated free commutative trialgebra and free abelian trialgebra are calculated respectively.
Recent Advances in the Electrocatalytic Application of Transition Metal Nitrides Nanocrystalline
Authors: Tang Haolin , Zheng Shuhong , Luo Ren
Published: April 2021

The energy crisis and environmental problems are becoming more and more severe due to the long-term consumption of fossil fuels. Therefore, energy conversion devices with high energy density and environmental friendliness (such as fuel cells, metal-air batteries, etc.) have been ex-pected to be reliable alternatives to traditional fossil energy. However, due to the inevitable use of precious metals as the electrode catalysts for these devices, the popularization of these alternatives is seriously hindered. Transition metal nitrides (TMNs) exhibit similar surface and adsorption properties to noble metals since the atomic distance between metal atoms increases and the d-band center of metal atoms downshift after the nitrogen atoms enter the metal lattice. TMNs have become one of the best electrode materials to replace noble metal electrocatalysts in energy storage and conversion devices. In this review, the latest development in the electrocatalytic ap-plication of TMNs nanocrystalline is covered. Firstly, we briefly discuss the structure and activity origin of TMNs and introduce the common physical and chemical methods for the preparation of TMNs. Subsequently, we illustrate the applications of unary TMNs and multivariate TMNs in oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Finally, we summarize the challenges and problems of TMNs encountered at the present stage, and expect its future de-velopment.
Static and Dynamic Testing of Sei Dareh Cable-Stayed Bridge West Sumatera, Indonesia
Authors: Sumargo Sumargo , Ramdhani Afdhal Lazuardiansyah
Published: April 2021

The Sei Dareh Bridge is a cable-stayed bridge located in West Sumatra Province, Indonesia. The bridge, has a main span of 123 meters length and 9 meters wide, crosses the Batanghari River. Traffic load is transmitted through 4 prestressed cables to a 42.4 meter high pylon made of concrete. Bridge deck and traffic loads are directly supported by steel box girders as main beams that are reinforced laterally with cross beams IWF 800.300.16.24 and stringers IWF 350.350.12.19. This paper discusses static and dynamic testing on the bridge which aims to assess the feasibility before it is opened for public. Based on the test, it was concluded that the 73% static load could not be achieved because the deflection that occurred was beyond the allowable deflection. This is exacerbated by the sound of a loud clanging sound on the ST2-X1 prestressed cable when loading to 240 tons or 58% of the targeted load. In addition, this bridge is included in the "lazy bridge" category because it takes 24 hours to return to an undeformed condition after loading. As a recommendation for this bridge, it is necessary to carry out a structural health monitoring system (SHMS) regularly on the vehicle floor and cables.
Connection of Two Conventional Enhanced to Encrypt Color Images
Authors: Hraoui Said , JarJar Abdellatif
Published: April 2021

This document introduces a new cryptosystem mixing two improvement standards generally used for text encryption, in order to give birth a new color image encryption algorithm capable of dealing with known attacks. Firstly, two substitution matrixes attached to a strong replacement function will be generated for advanced Vigenere technique application. At the end of this first round, the output vector is subdivided into size blocks according to the used chaotic map, for acting a single enhanced Hill circuit insured by a large inversible matrix. A detailed description of such a large involutive matrix constructed using Kronecker products will be given. accompanied by a dynamic translation vector to eliminate any linearity. A solid chaining is established between the encrypted block and the next clear block to avoid any differential attack. Simulations carried out on a large volume of images of different sizes and formats ensure that our approach is not exposed to any known attacks.
Quantification of the Direct Solar Impact on Some Components of the Hydroclimatic System
Authors: Constantin Mares , Ileana Mares , Venera Dobrica , Crisan Demetrescu
Published: April 2021

This study addresses the causal links between external factors and the main hydro-climatic variables. There is a gap in the literature on the description of a complete chain in addressing the structures of direct causal links of solar activity on the terrestrial variables. This is why, the present study uses the extensive facilities of the application of information theory in view of recent advances in different fields. Also, by other methods (e.g. neural networks) first are tested the existence non-linear links of solar-terrestrial influences on hydro-climate system. The results are promising related to the solar impact on terrestrial phenomena which is discriminant in space-time domain. The implications prove robust for determining the causal measure of climate variables under direct solar impact which makes it easier to consider solar activity in climate models, by appropriate parametrizations. This study found that hydro-climatic variables are sensitive to solar impact only for certain frequencies (periods) and these have a coherence with the Solar-Flux only for some lags of the Solar-Flux (in advance).
Synthesis, Spectroscopic, Calculated and Thermal Study of Copper and Cobalt Complexes with Dacarbazine
Authors: Świderski Grzegorz , Łaźny Ryszard , Sienkiewicz Michał , Kalinowska Monika , Świsłocka Renata , Acar Ali Osman , Golonko Aleksandra , Matejczyk Marzena , Lewandowski Włodzimierz
Published: April 2021

: Dacarbazine, DAC, 5-(3,3-dimethyltriazeno)imidazol-4-carboxamideis is an imidazole-carboxamide derivative, that is structurally related to purines. DAC belongs to the triazene compounds, which are a group of alkylating agents with antitumour and mutagenic properties. DAC is a non-cell cycle specific drug, active on all phases of cellular cycle. In the frame of this work the 3d-metal complexes (cobalt and copper) with dacarbazine were synthesized. Their spectroscopic properties by the use of FT-IR, FT-Raman and 1HNMR were studied. The structures of dacarbazine and its complexes with copper(II) and cobalt(II) were calculated using DFT methods. The effect of metals on the electronic charge distribution of dacarbazine was discussed on the basis of calculated NBO atomic charges. The reactivity of metal complexes in relation to ligand alone was estimated on the basis of calculated energy of HOMO and LUMO orbitals. The aromaticity of imidazole ring in dacarbazine and the complexes was compared (on the basis of calculated geometric indices of aromaticity). Thermal stability of the investigated 3d-metal complexes with dacarbazine and the products of their thermal decomposition were analyzed.
Evolution of the Microstructure and Mechanical Properties of a Ti35Nb2Sn Alloy Post-Processed by Hot Isostatic Pressing for Biomedical Applications
Authors: Femenía Joan Lario , Escuder Angel Vicente , Borrás Vicente Amigó
Published: April 2021

The influence of the hot isostatic pressing (HIP) post-processing step on structural and phase changes, porosity healing and mechanical strength in a powder metallurgy Ti35Nb2Sn alloy was studied. Powders were pressed at room temperature at 750 MPa, and then sintered at 1,350°C in a vacuum for 3 h. The standard HIP process at 1,200°C and 150 MPa for 3 h was performed to study its effect on a Ti35Nb2Sn powder metallurgy alloy. The influence of the HIP process and cold rate on density, microstructure, the quantity of interstitial elements, mechanical strength and Young's modulus was investigated. HIP post-processing for 2 h at 1,200°C and 150 MPa led to greater porosity reduction and a marked retention of the β phase at room temperature. The slow cooling rate during the HIP process affected phase stability, with a large amount of α”-phase precipitate, which decreased the titanium alloy’s yield strength.
Long-Range Optical Fiber Based Distributed Mechanical Vibration Sensing
Authors: Novotný Vít , Sysel Petr , Prokeš Aleš , Hanák Pavel , Slavíček Karel , Přinosil Jiří
Published: April 2021

The paper deals with the sensing system utilizing the standard single-mode optical fiber as a distributed sensor for detection, localization and classification of the mechanical vibrations that can be generated by various events such as walking or running people, moving cars, trains, etc. Sensor system capabilities were tested both in the laboratory and in the real situation with 88 km telecom optical link and the results are presented.
Solid Phase Synthesis of an Insect Pyrokinin Analog Incorporating an Imidazoline Ring as Isosteric Replacement of a trans Peptide Bond
Authors: Kaczmarek Krzysztof , Pacholczyk-Sienicka Barbara , Albrecht Łukasz , Zabrocki Janusz , Nachman Ronald
Published: April 2021

A facile solid-phase synthetic method for incorporating the imidazoline ring motif, a surrogate for a trans peptide bond, into bioactive peptides is reported. The example described is the synthesis of an imidazoline peptidomimetic analog of an insect pyrokinin neuropeptide via a cyclization reaction of an iminium salt generated from the preceding amino acid and 2,4-diaminopropanoic acid (Dap).
Video-Based Communication and its Association with Loneliness, Mental Health and Quality of Life among Older People during the COVID-19 Outbreak
Authors: Bonsaksen Tore , Thygesen Hilde , Leung Janni , Ruffolo Mary C. , Schoultz Mariyana , Price Daicia , Østertun Geirdal Amy
Published: April 2021

The aim of the study was to examine the use of video-based communication and its association with loneliness, mental health and quality of life in older adults (60-69 years versus 70+ years) during the COVID-19 pandemic. A cross-sectional online survey was conducted in Norway, UK, USA and Australia during April/May 2020, and 836 participants in the relevant age groups were included in the analysis. Multiple regression analyses were conducted to examine associations between use of video-based communication tools and loneliness, mental health and quality of life within age groups, while adjusting by sociodemographic variables. Video-based communication tools were found to be more often used among participants aged 60-69 years (60.1%), compared to participants aged 70 or above (51.8%, p < 0.05). Adjusting for all variables, use of video-based communication was associated with less loneliness (β = -0.12, p < 0.01) and higher quality of life (β = 0.14, p < 0.01) among participants aged 60-69 years, while no associations occurred for participants in the oldest age group. The use of video-based communication tools was therefore associated with favorable psychological outcomes among participants in their sixties, but not among participants in the oldest age group. The study results support the notion that age may influence the association between use of video-based communication tools and psychological outcomes amongst older people.
Comparison of Backpropagation and Kalman Filter-based Training for Neural Networks
Authors: Luttmann Laurin , Mercorelli Paolo
Published: April 2021

This work describes and compares the backpropagation algorithm with the Extended Kalman filter, a second-order training method which can be applied to the problem of learning neural network parameters and is known to converge in only a few iterations. The algorithms are compared with respect to their effectiveness and speed of convergence using simulated data for both, a regression and a classification task.
Toulouse, the Glorious Athens of the South? Computational Analysis of the Salons des Artistes Meridionaux (1907-1939)
Authors: Saint-Raymond Léa , Amice Solène , Hadjali Danyl , Hassayoun Haythem , Jean Paul , Sentuc Julien , Soriano Pavel , Videau Mathurin , Zhao Yi
Published: April 2021

Created in 1905, the Société des Artistes Meridionaux organized annual exhibitions in Toulouse, in order to promote regional arts and (re)created a "Latin" - and modern - style. Based on a corpus of 11,486 artworks exhibited at the SAM between 1907 and 1939, this paper seeks to measure the contours and particularities of the Salons des Artistes Meridionaux, using a computational approach.
Marshall McLuhan’s General Theory of Media (GToM), His Laws of Media; Comparing Three Kinds of Law
Authors: Logan Robert K.
Published: April 2021

We suggest that despite McLuhan’s claim not to have a theory of communication that in fact the body of his work does indeed constitute a theory of media and their effects which I have called his General Theory of Media (GToM) that also includes his Laws of Media (LoM). Both McLuhan’s GToM and his LoM are described. A comparison is made of three notions of law: i. McLuhan’s notion of law as used in his Laws of Media; ii. the notions of the Law in the legal sense and iii. the notion of law as formulated in scientific laws. McLuhan’s understanding of media is used to analyze some of the negative effects of social media suggesting that laws need to be formulated to prevent the misuse of social media that are antithetical to democracy and the invasion of the privacy of the individual users of these apps. McLuhan’s Laws of Media are then used to provide insights into the nature of scientific laws, the Law in the legal sense and his own Laws of Media.
Deep Learning-based Survival Analysis for High-dimensional Survival Data
Authors: Ha Il Do , Hao Lin , Kim Juncheol , Kwon Sookhee
Published: April 2021

As the development of high-throughput technologies, more and more high-dimensional or ultra high-dimensional genomic data are generated. Therefore, how to make effective analysis of such data becomes a challenge. Machine learning (ML) algorithms have been widely applied for modelling nonlinear and complicated interactions in a variety of practical fields such as high-dimensional survival data. Recently, the multilayer deep neural network (DNN) models have made remarkable achievements. Thus, a Cox-based DNN prediction survival model (DNNSurv model) , which was built with Keras and Tensorflow, was developed. However, its results were only evaluated to the survival datasets with high-dimensional or large sample sizes. In this paper, we evaluate the prediction performance of the DNNSurv model using ultra high-dimensional and high-dimensional survival datasets, and compare it with three popular ML survival prediction models (i.e., random survival forest and Cox-based LASSO and Ridge models). For this purpose we also present the optimal setting of several hyper-parameters including selection of tuning parameter. The proposed method demonstrates via data analysis that the DNNSurv model performs overall well as compared with the ML models, in terms of three main evaluation measures (i.e., concordance index, time-dependent Brier score and time-dependent AUC) for survival prediction performance.
ISIDOG Consensus Guidelines on Covid-19 Vaccination for Women before, during and after Pregnancy
Authors: Donders Gilbert Gerard Ghislain , Grinceviciene Svitrigaile , Haldre Kai , Lonnee-Hofmann Risa , Donders Francesca , Tsiakalos Aristotelis , Adriaanse Albert , Martinez de Oliveira Jose , Ault Kevin , Mendling Werner
Published: April 2021

Introduction.Sars-CoV-2 infection poses particular problems in pregnancy, as the infection more frequently causes severe complications than in unaffected pregnant women, or non-pregnant women with SARS-CoV-2 infection. Now that vaccination is available and rapidly getting implemented worldwide, the question arises whether pregnant women should be vaccinated, and if so, whether they should get priority. Methods. Available scientific data and available guidelines about vaccination against SARS-CoV-2 were collected by the Guideline Committee of the International Society of Infectious Diseases in Obstetrics and Gynecology (ISIDOG), and were analyzed, discussed and summarized as guidelines for health care workers caring for pregnant women. Concluding statements were graded according to the Oxford Evidence Based Medicine Grading System. Results. There is evidence to consider pregnancy as a risk factor for serious complications of COVID-19 infection, even in the absence of additional risk factors, such as hypertension, diabetes and obesity which increase these risks even more in pregnancy. Currently available data slightly favor mRNA-based vaccines above vector-based vaccines during pregnancy and breastfeeding, until more safety data become available. Conclusion. ISIDOG advices policy makers and societies to prioritize pregnant women to receive vaccination against SARS-CoV-2, and favor the mRNA vaccines until further safety information becomes available.
Enriching Elementary School Mathematical Learning with the Steepest Descent Algorithm
Authors: Araya Roberto
Published: April 2021

The Steepest Descent (or Ascent) algorithm is one of the most widely used algorithms in Science, Technology, Engineering, and Mathematics (STEM). However, this powerful mathematical tool is neither taught nor even mentioned in K12 education. We study whether it is feasible for elementary school students to learn this algorithm, while also aligning with the standard school curriculum. We also look at whether it can be used to create enriching activities connected to children’s real-life experiences, thus enhancing the integration of STEM and fostering Computational Thinking. To address these questions, we conducted an empirical study in two phases. In the first phase, we tested the feasibility with teachers. In a face-to-face professional development work-shop with 457 mathematics teachers actively participating using an online platform, we found that after a 10-minute introduction they could successfully apply the algorithm and use it in a couple of models. They were also able to complete two complex and novel tasks: selecting models and adjusting the parameters of a model that uses the steepest descent algorithm. In a second phase, we tested the feasibility with 90 fourth graders from 3 low Socioeconomic Status (SES) schools. Using the same introduction and posing the same questions, we found that they were able to understand the algorithm and successfully complete the tasks on the online platform. Additionally, we found that close to 75% of the students completed the two complex modeling tasks and performed similarly to the teachers.
AuNP Coupled Rapid Flow-Through Dot-Blot Immuno-Assay for COVID-19 (SARS-CoV-2) Explicit IgG Antibody Revelation
Authors: Sil Bijon Kumar , Jamiruddin Mohd. Raeed , Haq Md. Ahsanul , Khondoker Mohib Ullah , Jahan Nowshin , Khandker Shahad Saif , Ali Tamanna , Oishee Mumtarin Jannat , Kaitsuka Taku , Mie Masayasu , Tomizawa Kazuhito , Kobatake Eiry , Haque Mainul , Adnan Nihad
Published: April 2021

Background: Flow-through dot-blot assay (FT-DBA) for SARS-CoV-2 specific IgG detection will provide a reliable and affordable immunoassay for the rapid serosurveillance against COVID-19. Method: SARS-CoV-2 antigens were immobilized on nitrocellulose membrane to capture IgG immunoglobulins, which were then detected with AuNP anti-human IgG. A total of 181 samples were characterized with in-house and commercial immunoassay. The positive panel consisted of RT-PCR positive samples from patients with both <14 days and >14 days from the onset of symptoms, while the negative panel contained samples collected either from the pre-pandemic era dengue patients from healthy donors during the pandemic period. Results: In-house ELISA selected a total of 79 true seropositive and 100 seronegative samples. The sensitivity of samples with <14 days using FT-DBA was 94.7% which increased to 100% for samples >14 days. The overall detection sensitivity and specificity were 98.8% and 98%, respectively, whereas the overall PPV and NPV were 97.6% and 99%. Moreover, comparative analysis between ELISA and FT-DBA revealed clinical agreement of Cohen’s Kappa value of 0.944. Conclusion: The assay can confirm past SARS-CoV-2 infection with high accuracy within 2 minutes compared to ELISA. It can help track SARS-CoV-2 disease progression, population screening, and vaccination response.
Morphological Transformation of Arched Ribbon Driven by Torsion
Authors: Dai Yuanfan , sun bohua , Zhang Yi , Li Xiang
Published: April 2021

The morphological transformation of an arched ribbon driven by torsion is a scientific problem that is connected with daily life and requires thorough analysis. An arched ribbon can achieve an instantaneous high speed through energy transformation and then return to the original shape of the structure. In this paper, based on the characteristics of the ribbon structure, the dynamic mathematical model of the arched ribbon driven by torsion is established from the Kirchhoff rod equation. The variations of the Euler angle of each point on the center line of the ribbon with the arc coordinate s and the rotation angle of the supports $\phi$ was examined. The relationship between the internal force distribution of each point in the direction of $\hat{d}_{a}$ and the material, cross-sectional properties, and rotation angle of the supports was obtained. We used ABAQUS, a nonlinear finite element analysis tool, to simulate the morphological transformations of the ribbons, verified our theory with simulation results, and reproduced the experimental results of Sano. Furthermore, we redefined the concept of the ``critical flipping point'' of Sano. In this paper, the dimensional analysis method was used to fit the simulation data. The following relationship between the critical width $ w ^{*} $, thickness h, and the radius R of the ribbon with different cross sections was obtained: $w^{*}=A\cdot R\left(h/R\right)^{0.6}$, where A is 3.19 for rectangular cross sections and 3.06 for elliptical cross sections. By analyzing the simulation data, we determined the variation behavior of the out-of-plane deflection of the center point of the ribbon with the radius R, width w, and thickness h. Our research has guiding significance for understanding and designing arched ribbons driven by torsion, and the results can be applied to problems of different scales.
Directional Plasmonic Excitation by Helical Nanotips
Authors: Singh Leeju , Maccaferri Nicolò , Garoli Denis , gorodetski yuri
Published: April 2021

The phenomenon of coupling between light and surface plasmon polaritons requires specific momentum matching conditions. In the case of a single scattering object on a metallic surface, like a nanoparticle or a nanohole, the coupling between a broadband effect, i.e. scattering, and a discrete one such as surface plasmon excitation, leads to Fano-like resonance lineshapes. The necessary phase matching requirements can be used to engineer the light-plasmon coupling and to achieve a directional plasmonic excitation. Here we investigate this effect by using a chiral nanotip to excite surface plasmons with a strong spin-dependent azimuthal variation. This effect can be described by a Fano-like interference with a complex coupling factor that can be modified thanks to a symmetry breaking of a nanostructure.
One-bath One-step Dyeing of Polyester/Cotton (PC) Blends Fabric With Disperse Dyes After Acetylation of Cotton
Authors: Bana Girmaye Kumsa , Gelebo Gemeda Gebino , Janka Gezu Ketema
Published: April 2021

Usually, the two-bath dyeing process using disperse dyes and reactive dyes separately was employed for the dyeing of PC blends. The cost of the double bath, dyeing cycle, energy consumption and chemical consumption is quite higher than the one-step or single bath dyeing methods. In this study, the one-bath dyeing process using one kind of dye was investigated. Polyester cotton blends dyed in one-bath one-step dyeing methods with disperse dye after surface modifications of cotton by acetylation methods were studied. Surface modification of cotton was carried out using fibrous acetylation methods. The effect of acetic anhydride and time on percent acetyl content at room temperature was studied. Modified polyester/cotton was carried out in HTHP dyeing machine incorporates with different dye concentrations and dyeing temperature. Surface chemistry, thermal decomposition property and moisture regain of modified polyester/ cotton blend are evaluated. The color strength of the dyed fabrics and their fastness properties to washing, light, and rubbing as well as tear strength and abrasion resistance were evaluated. The effect of dye concentration and temperature color strength, tensile strength warp and weft direction was assessed. The optimum value for surface modification was obtained with a concentration of acetylation agent 16% and time of reaction 2.5 hours, gave percent acetylation of 34. An FTIR spectrum shows acetylation resonance. The experiment result of dyeing showed that the optimum value was obtained with dye concentration above 1% at a temperature of 120oC, warp tensile strength decreased by 12% and weft tensile strength was decreased by 9% from the control half-bleached fabric. Results of this study showed that a one-step one-bath dyed modified polyester/cotton blend with disperse dye fabric presents good fastness property compared with conventional two-bath dyed fabric as well as colour strength values.