bluuebunny/crossref_metadata_2025 huggingface dataset:
COMMENT HACKER LA CATASTROPHE ?
Authors: MAMAVI Olivier , ZERBIB Romain
Published: April 2021

La pandémie du Covid-19 est une catastrophe ! Mais l'heure est maintenant venue de penser les stratégies et les décisions qui peuvent être issues de l'exploitation de la donnée. C'est dans cette perspective que la revue de Management & Datascience propose un numéro qui montre comment le pilotage par la donnée permet d’organiser la métamorphose pour #hackezlacatastrophe.
Key performance indicators and set-points in sugar beet processing
Authors: Bruijn Jan Maarten de
Published: April 2021

Each sugar factory needs appropriate guidance to produce the desired white sugar product and co-products in their installed process equipment from the received sugar beet in a cost-effective way. Based on the generally known principles of sugar technology and supported by the extensive experience in beet sugar processing, this paper provides an overview of important key performance indicators (KPIs) which a factory could use as targets to optimize their beet processing. The recommended technological process set-points, which are required to fulfil the defined KPI targets, will be covered too. The theoretical background of sugar process technology is at the basis for the determination of the recommended process control parameters and will be used to explain the preferred choices of KPIs and process set-points.
INSTITUTIONAL SUPPORT FOR THE IMPLEMENTATION OF STATE DEMOGRAPHIC POLICY IN UKRAINE
Authors: Dragan Ivan Dragan Ivan , Dolinchenko Olga Dolinchenko Olga
Published: April 2021

The article substantiates the theoretical provisions for improving the implementation of state demographic policy based on the development of its institutional support. It is proposed to create a single subject of organizational and economic influence on demographic development.
The concept of activity of such subject on blocks is specified: the purposes and tasks, principles of activity, sources of financing, a product of activity (strategy of the state regulation of demographic development of region, the program of its realization), expected result.
The main tasks of the Regional Commission for Demographic Development should be: ensuring cooperation between state executive bodies, local governments, public organizations; conducting demographic examination of regulations, socio-economic programs to identify possible demographic factors and the consequences of management decisions at the regional and local levels that may affect the demographic development of the region, or relate to those aspects of regional development that depend on demographic processes; monitoring of the demographic situation in the districts and cities of the region, analysis of the practice of implementation of demographic policy in the region, evaluation of the effectiveness of the measures taken; preparation of proposals for improving policies in the field of stimulating the birth rate, reducing mortality and regulating migration processes; organization of sociological research on the implementation of demographic policy measures; holding meetings, conferences, seminars on issues related to the development and implementation of state regulation of demographic development; interregional cooperation on the regulation of demographic processes.
Keywords: state demographic policy, state regulation, institutional support, development of the region, mechanisms of influence, strategy.
The Specter of Inequality
Authors: Lepage Henri
Published: April 2021

The tremendous acclaim received by Thomas Piketty’s Capital in the Twenty-First Century has less to do with its intrinsic quality than with its utility to those who seek to legitimize the intrusive ambitions of the modern state. The book itself is riddled with theoretical and methodological shortcomings, as detailed here by economist Henri Lepage.
Tōhoku
Authors: Jardine Rick
Published: April 2021

Rick Jardine evaluates Alexander Grothendieck’s 1957 mathematical masterpiece, Some Aspects of Homological Algebra, a turning point in homological algebra, algebraic topology and algebraic geometry, and for modern mathematics as a whole.
Evolution: A Theory in Crisis Revisited (Part Two of Three)
Authors: Denton Michael
Published: April 2021

Despite massive discoveries in many areas of biology, orthodox evolutionary theory is no better able to explain the origins of key taxa-defining innovations than it was 30 years ago. Biochemist Michael Denton reappraises his 1985 book Evolution: A Theory in Crisis in light of these discoveries.
Smells, Spanners, and Switches
Authors: Turin Luca
Published: April 2021

Luca Turin argues that the olfactory system uses electron currents in receptors to detect the vibrational resonances of molecular bonds in odorants. The nose is a vibrational spectroscope; it is electronic, not mechanical.
Hitler’s Christianity
Authors: Lawson Chris , Scialabba George
Published: April 2021

Far from irreligious, Adolf Hitler did not perceive himself as being anti-Christian, but rather as bringing the Church back to what he saw as its proper, traditional role in persecuting the pestilent.
Cantor’s Diagonalization Method
Authors: Kharazishvili Alexander
Published: April 2021

The set of arithmetic truths is neither recursive, nor recursively enumerable. Mathematician Alexander Kharazishvili explores how powerful the celebrated diagonal method is for general and descriptive set theory, recursion theory, and Gödel’s incompleteness theorem.
Lost at Sea
Authors: Gelernter Josh
Published: April 2021

In 1938, the brilliant young theoretical physicist Ettore Majorana dropped off the face of the earth. Josh Gelernter explores Majorana’s foundational work with autoionization and fermions, and his mysterious disappearance.
Les monnaies cryptographiques et les systèmes à blockchain
Authors: Delahaye Jean-Paul
Published: April 2021

Que sont les cryptomonnaies, et comment fonctionnent-elles ? En prenant le cas de Bitcoin, Jean-Paul Delahaye présente l’état actuel des systèmes de monnaie pair à pair, et à quoi ressemblent leurs futurs.
The Pope
Authors: Bernstein Jeremy
Published: April 2021

The story of the human (and elemental) interactions leading to the development of the atomic bomb. Jeremy Bernstein reviews The Pope of Physics: Enrico Fermi and the Birth of the Atomic Age by Gino Segrè and Bettina Hoerlin.
A Hand-Waving Exact Science
Authors: Glashow Sheldon Lee
Published: April 2021

Cosmology has evolved over the past few decades from a hand-waving qualitative discipline to what is more and more becoming an exact science. Max Tegmark’s work has been integral in this progression.
Five Orientations of Indonesian Christian Scholars’ Role: A Reflection Based on Joel A. Carpenter’s Thought
Authors: Pasang Fery Alexander
Published: April 2021

Christianity has grown to become the largest of world religions today. One of the strategic roles that Christianity has done so far is the role of its scholars. However, as the direction of its development is moving to the Southern and Eastern hemispheres of the world, Christianity is facing new challenges. The role of the Christian scholars in that area is facing new ones as well. The important question is not how large the extent but how the deep and fruitful Christianity is in the south and the east. In the end, these developments and fruits will have a reverse impact on the world globally. Indonesia is in an area where Christianity is developing and experiencing all these developments. How have Indonesian Christian scholars responded to this? This paper reflects Joel Carpenter's thoughts about Christian scholars' new orientation that the author tries to relate to the Indonesian context. Carpenter’s points of thought are very important and relevant to be implemented seriously in Indonesia. Its implementation becomes a concrete form for Indonesian Christian scholars to carry out their intellectual mandates.
Photodynamic therapy as a treatment option for skin cancer, developed on scars
Authors: Kapinus V. N. , Kaplan M. A. , Yaroslavtseva-Isayeva E. V. , Spichenkova I. S. , Kaprin A. D. , Ivanov S. A.
Published: April 2021

It is given a literature reference on the etiology, frequency and mechanisms of development, features of the clinical presentation and treatment options for skin cancer that has developed on scars. It is presented a detailed clinical observation of a patient with squamous cell skin cancer in the area of the right elbow joint, which occurred 67 years after the kerosene lamp burns of the skin of the right upper limb and the right half of the chest. The patient was initially treated with electron radiotherapy in the total focal dose 60 Gy with a partial effect, but after 10 months a relapse was diagnosed, for which multi-course photodynamic therapy was performed with a Photolon photosensitizer at a dose of 1.1 mg/kg; the way of light delivery was polypositional interstitial and distant, the laser radiation power density was 0.30 W/cm2, the laser radiation energy density was 200 J/cm2. The result of treatment is complete regression of the tumor, the patient was under regular observation without any signs of local, regional and distant metastasis. After 3 years, by the absence of signs of local relapse, the disease progression was diagnosed: metastatic lesion of the axillary lymph nodes on the right and multiple metastases in the lung tissue of both lungs. Treatment was performed: axillary lymphadenectomy on the right, targeted therapy with IgGl monoclonal antibodies directed against the epidermal growth factor receptor; on this background stabilization of the process was noted.
Treatment of beneficial prostate hyperplasia of large sizes: traditional surgical, low-invasive and laser technologies (literature review)
Authors: Roitberg G. E. , Astashov V. V. , Mkrtchyan K. G. , Lomshakov A. A.
Published: April 2021

Benign prostatic hyperplasia – one of the most common diseases in older men. The treatment strategy for benign prostatic hyperplasia consists in its drug therapy, or active surgical tactics. The indication for planned surgical treatment of benign prostatic hyperplasia is the progression of symptoms of the lower urinary tract, which are not amenable to drug correction. Men with a large prostate volume of more than 80 m3, with severe symptoms of the lower urinary tract, with a history of acute urinary retention episodes, represent a difficult group of patients in terms of choosing the tactics of surgical treatment. This article discusses the most common operations that are used in the treatment of benign prostatic hyperplasia (especially of large sizes): open adenectomy, transurethral resection of the prostate gland, enucleation of benign prostatic hyperplasia using a holmium laser, embolization of an artery of the prostate gland. Surgical treatment of benign prostatic hyperplasia requires an individual approach to the patient, taking into account his age, concomitant pathology and clinical symptoms.
BRCA1 ve BRCA2 Mutasyonlarının Tespitine Yönelik Yeni Nesil Dizileme Temelli Kit Geliştirilmesi ve Rutinde Kullanılan Yöntemler ile Valide Edilmesi
Authors: GİRGİN ÖZGÜMÜŞ Gözde , GÜNEY İlter
Published: April 2021

Amaç: Meme kanseri, kadınlarda en yaygın görülen kanser türü olup, Göğüs Kanseri Duyarlılık gen (BRCA1 ve BRCA2) mutasyonlarının meme ve yumurtalık kanserlerinin önemli bir kısmından sorumlu olduğu bilinmektedir. Bu genlerden birinde mutasyon taşıyan bireylerde yaşam boyu meme, yumurtalık, pankreas ve diğer kanserlere yakalanma riski oldukça yükselmektedir. BRCA1/2 gen mutasyonlarına sahip olan kişilerin belirlenmesi, genetik danışma ile tarama sıklığının artırılması ve potansiyel olarak hayat kurtaran önleyici tedavi stratejilerinin uygulanabilmesi için büyük önem taşımaktadır. Bu çalışmada gerçek zamanlı polimeraz zincir reaksiyonu (RT-PZR) yöntemi kullanılarak BRCA1/2 genlerinin yeni nesil dizi (NGS) analizi kütüphanelerinin hazırlanması ve NGS analizlerine uygun biyoinformatik iş akışının belirlenmesi amaçlanmıştır.Yöntem: Rutin analizlerde yaygın olarak kullanılan Multiplicom BRCA MASTR™ Dx Kiti ile çalışılmış hastalardan alınan kan örneklerinden, DNA izolasyonu sonrası RT-PZR ile NGS kütüphanelerinin hazırlanması ve her bir örneğin 2 farklı etiket dizi ile işaretlenmesinin ardından NGS analizlerinin biyoinformatik iş akışlarının belirlenmesi gerçekleştirilmiştir.Bulgular: Referans metoda göre test limitleri; %100 duyarlılık, %100 özgüllük ve %100 doğruluk olarak belirlenmiştir. Wilson yöntemi kullanılarak testin güven aralığı CI: %86-%100 olarak hesaplanmıştır.Sonuç: BRCA1 ve BRCA2 genlerinin klinik laboratuvarlar değerlendirmesine uygun verilerin elde edildiği, patojenik mutasyon tespitini yüksek verimlilik ve doğrulukla yapabilen uygun maliyetli bir NGS testinin geliştirilmesi ve analitik doğrulaması bu çalışma ile tamamlanmıştır.
Penerapan Kepemimpinan Pastoral Yesus Kristus Dalam Kitab Injil Bagi Sekolah Tinggi Teologi Pelita Dunia
Authors: Putra Adi , Sahari Gunar
Published: April 2021

This research discusses the pastoral leadership of Jesus Christ as written in the Bible to be applied in the Pelita Dunia Theological Seminary. So that every graduate produced can understand and practice correct pastoral leadership in accordance with the teachings and actions of Jesus Christ. This study uses a qualitative approach that combines a literature review with the results of interviews with several alumni. Through this research, information was obtained that Jesus' pastoral leadership based on the explanations in the Gospels is clearly visible in three ways, as Jesus' pastoral leadership carries out God's vision and that means that every pastor also carries out God's vision, Jesus' pastoral leadership reaches out to the lost and improves relationships and that means every pastor also reaches out to the lost congregation and mends broken relationship with God, and pastoral leadership Jesus disciplines and sends and that means every pastor disciplines and sends the congregation to preach the gospel. In addition, this study also concluded that Pelita Dunia Theological Seminary should include and teach Pastoral Leadership to every student in order to produce graduates who can serve like Jesus.
Validation of Stereophotoclinometric Shape Models of Asteroid (101955) Bennu during the OSIRIS-REx Mission
Authors: Al Asad M. M. , Philpott L. C. , Johnson C. L. , Barnouin O. S. , Palmer E. , Weirich J. R. , Daly M. G. , Perry M. E. , Gaskell R. , Bierhaus E. B. , Seabrook J. A. , Espiritu R. , Nair H. , Ernst C. , Daly R. T. , Nolan M. C. , Enos H. L. , Lauretta D. S.
Published: April 2021

NASA’s OSIRIS-REx mission to asteroid (101955) Bennu relied on the production of real-time shape models for both spacecraft navigation and scientific analysis. The primary method of constructing shape models during the early phases of the mission was image-based stereophotoclinometry (SPC). The SPC shape models were used for operational planning, navigation, sample site selection, and initial scientific investigations. To this end, detailed analyses of the quality of each shape model and a thorough documentation of all sources of error were vital to ensure proper considerations of the limitations of each model. In this paper, we present methods used during the OSIRIS-REx mission to validate the SPC shape models and construct the associated quality reports. Although developed for the OSIRIS-REx mission, these validation techniques can be applied to SPC-derived shape models of other planetary bodies.
Clubiona jiugong sp. nov., the fifth species of C. zilla-group from China (Araneae: Clubionidae)
Authors: Zeng Zuxian , Wang Da , Song Wanjuan , Yu Hao , Zhong Yang
Published: April 2021

The Clubiona zilla-group is a relatively small species group, distributed exclusively in East Asia, with only three species clearly documented so far.

Clubiona hooda Dong & Zhang, 2016, which was previously placed in the C. trivialis-group, is assigned to the C. zilla-group in the present paper. A new spider of the C. zilla-group from Jiugong Mountain in China is described under the name of C. jiugong sp. nov. Detailed descriptions and photographs of the new species are provided.
A rare case of intrathymic epidermoid cyst
Authors: Covantev Serghei , Afanaseva Varvara , Corlateanu Alexandru
Published: April 2021

Thymic cysts are a rare abnormality accounting for 1%–3% of all mediastinal masses. In most cases, they are asymptomatic and localized in the anterior mediastinum. Despite their benign nature, the presence of a mass is an indication for surgery to obtain a histological conclusion and reliably exclude an oncological process. Epidermoid cysts are rare and only a few cases are described in the literature. In our case report, we present a rare case of examination and treatment of a patient with a large anterior mediastinum mass, which, according to the results of histology, was an epidermoid cyst of the thymus.
Global stability of HIV/HTLV co-infection model with CTL-mediated immunity
Authors: Elaiw A. M. , AlShamrani N. H.
Published: April 2021

Mathematical modeling of human immunodeficiency virus (HIV) and human T-lymphotropic virus type Ⅰ (HTLV-I) mono-infections has received considerable attention during the last decades. These two viruses share the same way of transmission between individuals; through direct contact with certain contaminated body fluids. Therefore, a person can be co-infected with both viruses. In the present paper, we construct and analyze a new HIV/HTLV-I co-infection model under the effect of Cytotoxic T lymphocytes (CTLs) immune response. The model describes the interaction between susceptible CD\begin{document}$ 4^{+} $\end{document}T cells, silent HIV-infected cells, active HIV-infected cells, silent HTLV-infected cells, Tax-expressing (active) HTLV-infected cells, free HIV particles, HIV-specific CTLs and HTLV-specific CTLs. The HIV can spread by two routes of transmission, virus-to-cell (VTC) and cell-to-cell (CTC). Both active and silent HIV-infected cells can infect the susceptible CD\begin{document}$ 4^{+} $\end{document}T cells by CTC mechanism. On the other side, HTLV-I has only one mode of transmission via direct cell-to-cell contact. The well-posedness of the model is established by showing that the solutions of the model are nonnegative and bounded. We calculate all possible equilibria and define the key threshold parameters which govern the existence and stability of all equilibria of the model. We explore the global asymptotic stability of all equilibria by utilizing Lyapunov function and LaSalle's invariance principle. We have discussed the influence of CTL immune response on the co-infection dynamics. We have presented numerical simulations to justify the applicability and effectiveness of the theoretical results. In addition, we evaluate the effect of HTLV-I infection on the HIV dynamics and vice versa.
Bloch wave approach to almost periodic homogenization and approximations of effective coefficients
Authors: Ganesh Sista Sivaji , Tewary Vivek
Published: April 2021

Bloch wave homogenization is a spectral method for obtaining effective coefficients for periodically heterogeneous media. This method hinges on the direct integral decomposition of periodic operators, which is not available in a suitable form for almost periodic operators. In particular, the notion of Bloch eigenvalues and eigenvectors does not exist for almost periodic operators. However, we are able to recover the almost periodic homogenization result by employing a sequence of periodic approximations to almost periodic operators. We also establish a rate of convergence for approximations of homogenized tensors for a class of almost periodic media. The results are supported by a numerical study.
Synthesis and Characterization of LiFe1-xGdxPO4/C (x = 0.01; 0.05; 0.07) for a Lithium Battery Cathode
Authors: Suprabawati Anggi , Rahayu Iman , Noviyanti Atiek Rostika , Anggraeni Anni , Jodi Heri
Published: April 2021

Synthesis of LiFe1-xGdxPO4/C with (x = 0.01; 0.05; 0.07) have been carried out using a solid-state method from LiH2PO4, Fe2O3, Gd2O3, and Carbon. Al reactant are mixed and mashed with a ball milling for 8 hours, then heated at 80°C for 2 hours to evaporate free water. To complete the reaction, the sample then was sintered at two different temperature; first at 350°C for 6 hours and continue at 830°C for 10 hours under Argon gas (Ar) atmosphere. The sintered powder was characterized by XRD to determine the structure and phase purity. Sample LiFe1-xGdxPO4/C (x = 0.01; 0.05; 0.07) was adopted orthorhombic crystal structure and pnma space group, and no impurities detected. In general, the lattice parameter decreases with increasing Fe concentration, because of the size of the Fe3+ ion is smaller than that Gd3+ ion. Conductivities of LiFe0.93xGd0.07PO4/C, LiFe0.95Gd0.05PO4/C and LiFe0.99Gd0.01PO4/C are 2.17 x 10-4 S/cm, 1.54 x 10-4 S/cm, and 2.02 x 10-4 S/cm, respectively.
Origin of Degradation in Perovskite Solar Cells by Intensity Modulated Photovoltage Spectroscopy Measurement (IMVS)
Authors: Nurunnizar Adhita Asma , Fariz Alvin , Herman Herman , Hidayat Rahmat
Published: April 2021

Perovskite solar cells (PSCs) based on lead halide perovskite have attracted much attention owing to the fast development of their power conversion efficiency (PCE) from 3.8% to 25%. Various factors play important roles in affecting the conversion efficiency of PSCs, such as charge carrier generation, transport, recombination, and collection. In addition, the presence of interfacial defects has also a crucial effect in charge carrier transfer and recombination processes. However, the origin and mechanism of interfacial charge recombinations in PSCs are still not comprehensively investigated. For that purpose, we have performed intensity-modulated photovoltage spectroscopy (IMVS) and transient photovoltage (TPV) measurements of PSCs, which were fabricated with FTO/c-TiO2/mp-TiO2/Perovskite/PTAA/Au cell structure. The solar cell (J-V) characteristics of the PSCs on the day-1, day-2, day-3, and day-6 after the cell fabrication, indicating a significant degradation of the cell with time. The Nyquist plots of IMVS measurement on the same day as the J-V measurement seem to be composed of two semicircles at a lower frequency range and a higher frequency range. The semicircle at the lower frequency range enlarged on the day-6 measurement, but the semicircle at higher frequency decreased. The change of this Nyquist plot is in agreement with a significant decrease in the J-V curves. The semicircle at lower frequency may be assigned to the ion diffusion or migration. Therefore, cell degradation may be caused by the liberation of ions (including iodide) from the surface of the perovskite crystal structure. It then increases recombination loss due to back charge transfer from TiO2 to perovskite as indicated by the changing of the semicircle at high frequency into a smaller semicircle. Therefore, the present results reemphasize that the improvement of PSC stability needs the prevention of ions liberations from the surface by introducing passivation substances. In addition, the results also show the practical usefulness of IMVS for inspecting PSC degradation due to such an ion liberation process.
Study on the Diffusion Rate of the Charge Carrier Transport in Regio-Random and Regio-Regular P3HT
Authors: Riveli Nowo , Risdiana Risdiana
Published: April 2021

Muon spin relaxation experiment has been conducted to probe the hopping mechanism in the poly(3-hexylthiophene-2,5-diyl) (P3HT) for both types of regio-random (Rdm) and regio-regular (RR). In this study we have performed calculations over the collected data to obtain the parallel and perpendicular diffusion rates, at temperatures of 10 K and 300 K. The calculation is based on the fitting method to the empirical function that relates the relaxation rate with the diffusion rates. For Rdm-P3HT, we have obtained the parallel diffusion rate to be 5.43 x 1013 rad/s at 300 K and 4.90 x 1014 rad/s at 10 K. While the perpendicular diffusion rates are 5.29 x 108 rad/s at 300 K and 1.88 x 106 rad/s at 10 K. For RR-P3HT, we have obtained the parallel diffusion rate to be 1.04 x 1014 rad/s at 300 K and 1.28 x 1015 rad/s at 10 K. While the perpendicular diffusion rates are 6.10 x 108 rad/s at 300 K and 5.35 x 105 at 10 K. The diffusion rates of RR-P3HT are higher than that of Rdm-P3HT, especially in the parallel direction. In both types of material, the parallel diffusion rate decreased with temperature, while the perpendicular diffusion rate increased with temperature, showing a change of behavior from 1D to 3D direction of charge transport.
Electronic Structure of Lead-Free Halide Perovskite Material: Cs2SnI6, for Perovskite Solar Cells Applications
Authors: Handayani Yolla Sukma , Wulandari Priastuti , Herman Herman , Hidayat Rahmat
Published: April 2021

Perovskite solar cells have been investigated intensively due to their promising performance which increased significantly since it was found a few years ago. In this paper, we reported the computational results of electronic structures of lead-free halide perovskite material, Cs2SnI6. This perovskite has been much reported recently because of its properties as electron transport material. Its electronic structure was computationally calculated based on the Density Functional Theory (DFT) by using the Quantum Espresso computational package, implemented by using the Perdew-Burke-Ernzerhof (PBE) of scalar relativistic exchange-correlation functional and the HSE06 hybrid functional. The calculation results show that Cs2SnI6 has a direct bandgap of 0.28 eV and 0.82 eV for the calculation by using PBE and HSE06, respectively. The calculation using HSE06 results produce a closer result to the experimental data.
Thermal Modification by High Speed In Situ Mixing for Nanoparticles TiO2 and SDS Surfactant to Paraffin Based PCM Nano Enhanced Composite
Authors: Arfiansyah Edwin , Juwono Ariadne Lakshmidevi
Published: April 2021

The use of liquid-solid type phase change material (PCM) is increasing due to the importance of having a good storage for latent heat, which can be attributed to its wide range of application, such as electronics, buildings, textiles, and the automotive sector. This study employed an experimental procedure through in situ mechanical mixing of paraffin-based PCM and 4Wt% Titanium dioxide (TiO2) rutile to form nanocomposite PCM with high-speed agitation (900 rpm at 90°C for 60 minutes) and mixed with Sodium Dodecyl Sulphate (SDS) as the dispersant. It was conducted by applying premixing of polar solution (distilled H20 + 4Wt% SDS dispersant) to the aforementioned non-polar paraffin-based solution (paraffin wax + 4Wt% TiO2) in a 1:4 ratio, then cooled naturally. The Fourier Transient Infrared (FTIR) spectrum and the X-Ray Diffraction (XRD) pattern indicated a characteristic typical of composite systems, in which. there is no new material system composed. The typical wavenumbers of composite PW+TiO2 (2918 cm-1, 2851cm-1, 1471 cm-1, 720cm-1 and 469 cm-1) were also seen in the FTIR, while high intensity peaks 2θ = 21.4°, 23.8 and low intensity peaks 27.4°, 36.074°, XRD patterns could be tied to monoclinic paraffin crystal with the typical plane diffractions of (110) and (200) and TiO2. The thermal properties of the composite were measured using Differential Scanning Calorimetry. The findings showed that the paraffin based PCM comprised a higher thermal storage capacity of 144.3 J/g compared to its common 104.5 J/g typology. Scanning Electron Microscope observation showed a better dispersion of TiO2 clusters (smooth, spherical, and spreading). The results ultimately showed that optimizing the agitation speed at the prompt temperature contributes to the increase of the crystallite size and the capacity to isolate the temperature of nanoparticles, which may elicit a growing interest for more practical applications of the nanocomposites PCM.
Preparation of Iron Nitride Material from Natural Iron Sand
Authors: Sidharta Indra , Romadhon Nur Hidayat , Syah Rakhasoni Firman , Hafiyanda Rayhan Kurnia , Darminto Darminto , Shahab Abdullah
Published: April 2021

Iron nitride is a promising material for soft magnetic composite. In the current research, iron nitride compound was produced from natural iron sand, involving coprecipitation and gas nitriding. Prior to coprecipitation, natural iron sands were separated magnetically to obtain pure Fe3O4. Afterward, the coprecipitation was carried out to obtain nanosized Fe3O4. Gas nitriding of Fe3O4 powders was performed at different temperatures i.e. 500 °C, 600 °C and 700 °C, under flowing NH3 gas. Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD) are used to investigate the phases obtained after the nitriding process. XRD patterns of the resulted powder indicate that nitriding temperature at 600 °C and 700 °C can produce iron nitride material, i.e. ε-Fe3N. While nitriding temperature of 500 °C is not able to yield iron nitrides. SEM examination reveals that the ε-Fe3N has irregular lamellar morphology. Some impurities are still detected, in the form of Fe3O4, Fe2O3, Ti2O3 and TiO2. Further works regarding the examination of the magnetic properties of the powders will be carried out.
Study of Phase Purity of Eu2-xCexCuO4 Synthesized by Solid State Method without Annealing Process
Authors: Tayubi Yuyu R. , Maryati Yati , Syakuur Muhammad Abdan , Auliya Diba Grace , Saragi Togar , Risdiana Risdiana
Published: April 2021

The samples of Eu2-xCexCuO4 (ECCO) with x = 0.10, 0.13, 0.17 and 0.20 have been synthesized by the solid reaction method without annealing process [1,2]. Each sample is covered by CuO powder to prevent excess oxygen entering the sample during heating process. The purpose of this research is to study the crystal structure and the level of phase purity in ECCO samples in the wide ranges of doping concentration of ECCO. The results of X-ray diffraction (XRD) characterization showed that the main peaks of T' tetragonal structure were observed in all samples. From the XRD analysis, it was found that the level of phase purity of ECCO was 100 % for x = 0.10, 100 % for x = 0.13, 79.5.% for x = 0.17, and 79.1 % for x = 0.20, respectively. For the lattice constant, it is found that both a and c-axis did not change significantly as the concentration increased. These results show that the synthesis method with CuO covering has succeeded in synthesizing materials with high phase purity although the constants do not change significantly when the concentration increased. However, there are some impurity phases found in high concentration of x that is probably due to the existence of excess oxygen, which was not fully absorbed by CuO Covering.
Thermoelectric Properties of SnO2/Bi2Te3 Composite
Authors: Nugraha Asep Ridwan , Kartika Nadya Larasati , Dedi Dedi , Nugroho Agustinus Agung
Published: April 2021

In this study, SnO2 nanoparticles of wt% 2, 4, 6, and 8 were uniformly composite in Bi2Te3 matrix. SnO2 nanoparticle was synthesized using co-precipitation method. The result shows that based on XRD and EDS analysis the composites do not contain any impurities. The thermoelectric properties of the composites strongly depend on the Seebeck coefficient. The highest value of Seebeck coefficient of -177 µV/K is obtained at around 375 K for the 4% SnO2/Bi2Te3 sample. This yields the highest value of the power factor of 4.0 × 10-3 Wm-1K-1 compared to the pure Bi2Te3 synthesized using the same procedure by 14.3%. This result demonstrates that the thermoelectric properties of Bi2Te3 can be improved using oxide nanoparticles.
Management Strategies for Nile Tilapia (Oreochromis niloticus) Hatchery in the Face of Climate Change Induced Rising Temperature
Authors: Alam S. M. Ashiqul , Sarkar Md. Shirajul Islam , Miah Md. Mahbubul Alam , Rashid Harunur
Published: April 2021

In the quest for appropriate management strategies for less egg production in Nile tilapia (Oreochromis niloticus) due to climate change induced increasing temperature, five treatments (T): shade with cloth over brood hapa (T1), increase in pond depth (T2), aeration (T3), combination of above three interventions (T4) and control (no intervention) (T5) were investigated in a commercial hatchery in Mymensingh, Bangladesh during April to September. Mean egg production in T1, T2, T3, T4 and T5 was 20488, 15369, 3596, 21021 and 3979 eggs/hapa, respectively. T1 was the best strategy considered due to efficiency and simplicity. In May T1, T2, T3, T4 and T5 produced highest 30859, 36119, 8997, 45876 and 5506 eggs/hapa at 29.69°C, 30.12°C, 29.96°C, 29.61°C, and 31.26°C temperature, respectively. The most suitable water temperature for highest egg production (20365 eggs/hapa) was 29-31°C. Egg production above 32°C was found to be very low (179 eggs/hapa). Suitable ranges of dissolved oxygen, pH, alkalinity, ammonia and turbidity for egg production were found to be 4.5-6.0 mg/L, 8.0-8.8, 105-150 mg/L, 0-0.5 mg/L and 15-35 cm, respectively. In high temperature months commercial fish hatcheries should use shed with cloth over brood hapa to produce higher amount eggs.
Effect of Zinc Sulphate (ZnSO4) on the Gall Bladder of Clarias batrachus (Linn. 1758)
Authors: Khan Saba Khursheed , Badroo Irfan Ashraf
Published: April 2021

Heavy metal exposure to biota has become a severe thread to the environment, as its bioaccumulation, toxicity and persistence is happing at an alarming rate. Heavy metal presence in water bodies has been reported by various researchers. Henceforth their exposure to aquatic organisms is certain. An investigation on the possible toxicological impact of Zinc sulphate on fish Clarias batrachus is carried out in laboratory. Histology of gall bladder was used as a marker for evaluation of toxicity after sub lethal exposure. Fish were exposed to sub-lethal concentrations of 5mg/L, 10mg/L and 15mg/L for 20 days. Simultaneous control was also maintained. Principle histological alterations were deformities in the normal structures of columnar epithelial line, muscular layer, and mucosal folds. 15mg/L and 20mg/L exposure of zinc sulphate altered the sub mucosa besides leading the formation of bile crystals, an indication of water loss. The severity of histopathology was exposure dependent. Histopathological alteration in gall bladder can be regarded as sensitive biomarkers of Zinc sulphate toxicological manifestations hence can be utilized for ecotoxicological biomonitoring of aquatic bodies.
Inland Aquaculture and Fish Health Management: A Case Study of Sylhet District in Bangladesh
Authors: Deb Anik , Chandan Chironjib Singha Samanta , Roy Puja , Hossain Md. Istiaque , Bari Sayed Mashequl
Published: April 2021

The inland aquaculture of Bangladesh has been intensified recently; however, decreased total inland production was also observed in few regions, including the Sylhet district. Therefore, the study was conducted to assess the condition of inland aquaculture and fish diseases in 36 aquaculture farms (Sylhet, Bangladesh) through questionnaire interviews and focus group discussions among farm stakeholders (n=216). There was no significant Upazilla-wise variation considering different parameters (P>0.05), except expenditure to prevent diseases. However, farms of medium and large size spent high to prevent diseases (P<0.05); this expense seems to make better farming conditions. In contrast, smaller farms were observed to have higher stocking density and production (P<0.05). Though different traditional and commercial chemicals and medicines were applied to prevent diseases and maintain water quality, respondents mentioned outbreaks of several diseases. Most respondents perceived financial help, proper training, and technical support could improve farming practices. Overall, public farms with well trained and experienced managers seemed to have better farming conditions than private farms.
О заменах переменной, сохраняющих абсолютную сходимость
рядов Фурье-Хаара непрерывных функций
Authors: Bitsadze Kakha Rostomovich
Published: April 2021

Известно, что среди всех дифференцируемых гомеоморфных замен
переменной только функции $\varphi_1(x)=x$ и $\varphi_2(x)=1-x$,
$x\in[0,1]$, сохраняют абсолютную сходимость всюду рядов Фурье-Хаара.
Устанавливается, что класс всех дифференцируемых гомеоморфных
замен переменной, сохраняющих абсолютную сходимость всюду, не
станет шире, если ограничиться непрерывными внешними функциями.
Библиография: 8 названий.
О свойствах окрестности аттрактора динамической системы
Authors: Kalitin Boris Sergeevich
Published: April 2021

Статья посвящена изучению динамических систем,
допускающих компактные аттракторы, которые описывают
поведение траекторий системы на бесконечности и играют важную роль
в качественной теории устойчивости движения.
Устанавливаются свойства траекторий динамической системы
в области притяжения аттракторов и на границе
с привлечением таких понятий, как эллиптические и
слабо эллиптические множества, а также свойств псевдоустойчивости
и псевдопролонгаций.
Библиография: 41 название.
Comparison of the predictability of the ultimate axial strength of elliptical CFST columns using existing square and circular section-based code formulae
Authors: İPEK Süleyman , GÜNEYİSİ Esra Mete
Published: April 2021

The elliptical hollow section has been recently included in the family of the structural steel hollow sections. This type of steel section is also used in the production of concrete-filled steel tubular (CFST) members. For the elliptical CFST compression members, there is no specific design formulation in the current provisions, except the code called “Technical code for concrete-filled tubular structures” prepared by the Ministry of Housing and Urban-Rural Development of the People’s Republic of China. However, the formula proposed by this code for estimating the ultimate strength of the elliptical CFST columns was achieved by modifying the formula for predicting the ultimate strength of the square CFST members. In this context, the objective of this study is to evaluate the applicability of the existing code formulae that were proposed for the axially loaded CFST columns with rectangular or circular sections to that of columns with an elliptical section. To this, a data repository consisting of 97 experimentally tested elliptical CFST columns was compiled. Herein, the main criterion in the selection of the data was the axial loading condition. Thereafter, the prediction performance of these code formulae was assessed in terms of statistical parameters. The results indicated that the code formulae proposed for the circular-sectioned CFST columns have better prediction capability than that suggested for the rectangular sections. Among these design formulae proposed for the CFST columns with a circular section, the formulae recommended by the American Institute of Steel Construction, British Standard Institute, Canadian Standards Association, and Eurocode 4 performed the best prediction capability. These code formulae had the lowest mean absolute percent error values and R-squared values of higher than 0.8.
FINOT PHYSTOOL (Find Out Physics Tools) sebagai Media Pengenalan Alat-Alat Praktikum Fisika Berbasis Aplikasi Game Android
Authors: Anggeraeni Raeka Widi , Rahmawati Yulika , Febriyana Monica Merry , Astuti Irnin Agustina Dwi
Published: April 2021

Umumnya, pelajaran fisika berkaitan dengan berbagai praktikum di laboratorium. Namun, sebagian besar siswa tidak memahami nama-nama alat praktikum yang akan digunakan. Hal ini juga mempengaruhi kegiatan praktikum menjadi kurang kondusif. Diperlukan inovasi untuk membantu peserta didik memahami alat praktikum yang bermanfaat. Salah satu aplikasi yang kami tawarkan adalah FINOT PHYSTOOL (Find Out Physics Tools), aplikasi media pembelajaran fisika berbasis game android yang menampilkan nama alat praktikum dan konsep materialnya. Penelitian ini adalah Research & Development (R&D) dengan model ADDIE. Instrumen yang digunakan adalah lembar pengamatan dan kuesioner validasi. Hasil analisis menunjukkan nilai rata-rata validasi ahli materi 80,50% dan ahli media 84,00%. Nilai rata-rata total dari validasi materi dan validasi media sebesar 82,25%. Ini menunjukkan bahwa aplikasi FINOT PHYSTOOL yang dikembangkan layak diimplementasikan untuk peserta didik. FINOT PHYSTOOL mudah dan fleksibel untuk meningkatkan minat belajar siswa sekaligus memudahkan siswa untuk mengenali alat-alat praktikum fisika.
Tingkat Stress Akademik Mahasiswa dalam Pembelajaran Daring pada Periode Pandemi Covid-19
Authors: Oktariani Iqtina Sabnaha , Sofah Rahmi , Putri Rani Mega
Published: April 2021

Institusi pendidikan baik itu dari tingkat pendidikan dasar hingga perguruan tinggi terpaksa ditutup untuk sementara waktu karena penyebaran Corona Virus 2019 (Covid-19). Tujuan penelitian ini untuk mengetahui tingkat stress akademik mahasiswa selama pembelajaran daring pada Program Studi Bimbingan dan Konseling di Universitas Sriwijaya. Tujuh puuh orang mahasiswa bimbingan dan konseling dilibatkan dalam studi ini. Kami menggunakan menggunakan angket Stress Akademik selama pembelajaran daring untuk mengumpulkan data dan penyebarannya melalui google form serta dianalisis secara deskriptif kuantitatif. Hasil dari penelitian menunjukkan bahwa stress Akademik mahasiswa bimbingan dan Konseling FKIP Universitas Sriwijaya berada pada kategori tinggi 15,71%, kategori sedang 65,71%, dan kategori rendah 18,57%. Mengacu temuan penelitian ini, dapat disimpulkan bahwa mahasiswa Bimbingan dan Konseling Kelas Palembang-Indralaya angkatan 2018, 2019, 2020 mengalami stress akademik dengan kategori sedang.
Pengembangan Media Pop-up Book Materi Kingdom Animalia untuk Siswa Sekolah Menengah Pertama
Authors: Mungallamah Dwi , Saifuddin Much Fuad
Published: April 2021

Penelitian ini bertujuan untuk mengetahui kelayakan media pop-up book pada materi kingdom animalia kelompok avertebrata. Penelitian ini merupakan penelitian pengembangan dengan model 4D (Define, Design, Develope, Disseminate). Data yang diperoleh melalui instrumen penelitian untuk ahli materi, ahli media, penilaian guru IPA, dan angket respon siswa Sekolah Menengah Pertama. Hasil nilai kelayakan dari ahli media dengan rata-rata 85,8% yang dinyatakan sangat layak. Hasil nilai kelayakan dari ahli materi dengan nilai rata-rata 63,8% yang dinyatakan layak. Hasil penilaian dengan guru IPA dengan nilai rata-rata 95,25% dinyatakan sangat layak. Uji coba dilakukan dengan uji coba kelompok kecil dan uji coba kelompok besar. Hasil uji coba kelayakan pada kelompok kecil dengan rata-rata sebesar 98,66% yang dikatakan sangat layak; sedangkan uji coba kelompok besar dengan rata-rata sebesar 92,91% dengan kategori sangat layak. Temuan ini menunjukkan bahwa media pop-up book dikatakan layak menjadi media pembelajaran yang digunakan dalam kegiatan pembelajaran.
Mengkaji Pengaruh Pemberian Lemon Tehadap Emesis Gravidarum
Authors: Susiloningtyas Is , Suhartinah Siti
Published: April 2021

Pendahuluan selama masa kehamilan, berbagai perubahan terjadi baik perubahan fisik maupun psikis yang memungkinkan timbulnya masalah pada kehamilan, terutama kehamilan trimester pertama. Salah satu masalah yang muncul adalah mual dan muntah yang biasa disebut morning sickness yang biasa terjadi. 60-80% wanita hamil pernah mengalami mual muntah (NVP). Salah satu alternatif untuk mengatasi mual dan muntah pada kehamilan non farmakologis adalah dengan menggunakan aromaterapi. Salah satu aromaterapi yang dapat digunakan yaitu dengan menggunakan lemon. Metode literatur mancanegara ditelusuri melalui sarana media elektronik dengan penuntun kata kunci. Artikel terseleksi sejumlah 8, yang masing masing mewakili satu pengaruh lemon terhadap penurunan mual muntah pada ibu hamil dan memberi informasi yang bervariatif. Hasil: Adanya perbedaan mual muntah pada responden sebelum dan sesudah dilakukan pemberian perlakuan dengan aromaterapi lemon. Pembahasan cara mengatasi mual muntah pada saat hamil dapat dilakukan dengan beberapa cara yaitu dapat melalui tindakan farmakologis dan non farmakologis. Tindakan non farmakologis biasanya dianjurkan oleh petugas kesehatan seperti mendorong ibu hamil untuk melakukan aromaterapi. Salah satu aromaterapi yang dapat digunakan untuk mengurangi mual muntah saat hamil yaitu aromaterapi lemon karena lemon memiliki bahan yang dapat membunuh bakteri meningokokus (meningococcus), bakteri tifus, memiliki efek antijamur dan efektif untuk menetralkan bau tidak sedap, serta menghasilkan anticemas, antidepresi, anti stres, serta untuk mengangkat dan memfokuskan pikiran. Kesimpulan berdasarkan analisa yang telah dilakukan, penggunaan aromaterapi lemon efektif untuk mengurangi mual muntah pada ibu hamil.
Pengaruh Kerjasama Tim Terhadap Upaya Pengurangan Risiko Infeksi Di Unit Rawat Inap Rs
Authors: Elvira Purba Cintya , Nugroho Natsir , Indrawati Ratna
Published: April 2021

Tanggal 11 Maret 2020 WHO menetapkan Covid-19 sebagai pandemik. Di Indonesia sampai dengan Juni 2020 menurut data dari PHEOC Kemenkes kasus Covid-19 terkonfirmasi sudah mencapai 56.385 kasus diantaranya 2.976 kasus meninggal dunia. Dalam era pandemic Covid-19, RS X Pulomas menerapkan berbagai upaya dalam mengurangi risiko infeksi. Penelitian ini bertujuan untuk mengetahui pengaruh komunikasi dan kerjasama tim yang dimediasi oleh kepemimpinan terhadap upaya pengurangan risiko infeksi di Unit Rawat Inap Rumah Sakit X, Pulomas. Model penelitian yang digunakan adalah korelasi multipel, dimana menggunakan pendekatan kuantitatif dan metode survey. Variabel terikat dalam penelitian ini adalah Upaya Pengurangan Risiko Infeksi dengan variabel-variabel bebas adalah: Komunikasi, Kerjasama Tim dan Kepemimpinan sebagai variabel mediasi. Sampel dalam penelitian ini merupakan sampel jenuh yaitu sebanyak 60 perawat di unit rawat inap, menggunakan instrument kuesioner dengan pengukuran skala Likert. Data hasil penelitian dianalisis menggunakan SPSS 25 dan AMOS 20.  Hasil penelitian menunjukkan bahwa, Komunikasi dan kerjasama tim berpengaruh signifikan terhadap upaya pengurangan risiko infeksi. Variabel kerjasama tim merupakan variabel yang paling berpengaruh dalam upaya pengurangan risiko infeksi. Hasil analisis lainnya didapatkan kepemimpinan tidak memediasi antara komunikasi dan kerjasama tim terhadap upaya pengurangan risiko infeksi
Tingkat Pengetahuan Pandemi Covid-19 Kader Posyandu Di Wilayah Kerja Puskesmas Jakarta Timur
Authors: Rahmawati Eka , Krianto Tri
Published: April 2021

Pandemi COVID-19 ialah tantangan dalam upaya peningkatan derajat kesehatan serta pembangunan Indonesia. Salah satu akibat dari keadaan tersebut ialah terganggunya penerapan pelayanan kesehatan publik yaitu penutupan ataupun penundaan layanan di posyandu yang ialah sarana pelayanan kesehatan primer serta merupakan kekuatan utama dalam peningkatan derajat kesehatan. Tujuan penelitian ini untuk mengetahui gambaran tingkat pengetahuan kader posyandu terkait pandemi COVID-19 di Jakarta Timur. Penelitian dilakukan secara deskriptif menggunakan kuesioner. Subjek penelitian sebanyak 382 kader posyandu yang terbagi dalam 10 Wilayah Puskesmas Kecamatan di Jakarta Timur. Pengetahuan kader posyandu mengenai pandemi COVID-19 secara umum baik. Namun terdapat beberapa pertanyaan dengan jawaban benar terendah. Sebanyak 53,14% kader posyandu tidak mengetahui bagaimana upaya untuk menjaga diri terhindar dari COVID-19 di rumah, 43,46% tidak mengetahui suhu tubuh yang bisa diindikasikan sedang terjangkit penyakit termasuk COVID-19, dan 39,01% tidak mengetahui etika batuk/bersin yang benar.