bluuebunny/crossref_metadata_2025 huggingface dataset:
Understanding Lifeguard Recruitment and Selection Practices in Victorian Aquatic and Recreation Centers (ARCs)
Authors: Butson Michael , Tower John , Schwarz Eric
Published: March 2022

Extensive research has focused on human resource management (HRM) and recruitment and selection practices across different settings. However, there is a gap in the scholarly literature in ARC settings, including lifeguards. Additionally, the aquatics industry is experiencing unprecedented levels of lifeguard turnover within aquatic facilities. The recruitment and selection process can impact employee turnover. Therefore, an important first step to address lifeguard turnover is to better understand the current recruitment and selection practices of lifeguards. This study focuses on the recruitment and selection practices of ARC management to better understand the recruitment and selection of lifeguards. The analysis is based on 16 semi-structured interviews with ARC managers involved in lifeguard recruitment and selection. Participants included center managers, assistant center managers, and operations managers/coordinators. A deductive analysis was able to effectively explain the current recruitment and selection practices for recruiting lifeguards in Victorian ARCs.
Effects of a Demand-Valve SCUBA Regulator on Cardiorespiratory Response During Submaximal Exercise Under Normobaric Conditions: A Preliminary Investigation
Authors: Kovacs Christopher , Dhom Camille
Published: March 2022

SCUBA diving fatalities are often related to cardiac events triggered by stress linked to equipment. The purpose of this investigation was to examine the effects of a SCUBA regulator on cardiorespiratory exercise at a submaximal workload. Ten participants (mean = 21.5 yrs; s.d. = 1.16) completed two submaximal exercise tests at 1 ATA; one while breathing normally and a second while breathing directly from a demand valve SCUBA regulator. Total time to test completion (TOT), heart rate (HR), blood pressure (BP), rating of perceived exertion (RPE), and arterial oxygen levels were all assessed. No significant differences between conditions were found for measures of TOT, heart rate, blood pressure, RPE, and arterial oxygen measures. Statistical analysis suggested that use of a SCUBA regulator itself did not affect exercise tolerance or increase cardiorespiratory stress at submaximal workloads. Several anecdotal observations in HR, BP, TOT, and RPE responses suggested further research is warranted.
Soliton solutions for perturbed Radhakrishnan-Kundu-Lakshmanan equation
Authors: TÜLÜCE DEMİRAY Şeyma , BAYRAKCI Uğur , YILDIRIM Vehpi
Published: March 2022

To find some soliton solutions of the equation, the perturbed Radhakrishnan-Kundu-Lakshmanan (RKL) equation has been considered. For this purpose, GKM (generalized Kudryashov method), which is one of the solution methods of nonlinear evolution equations (NLEEs), has been applied to the perturbed RKL equation. First, considered the nonlinear partial differential equation, is reduced to an ordinary differential equation with the help of the traveling wave transformation. Afterward, obtained the algebraic equation system through the balance principle was solved with the help of Wolfram Mathematica 12. Thus, some new soliton solutions of the discussed equation have been obtained. Both 2D and 3D graphics have been drawn with the help of Wolfram Mathematica 12 by giving some values to obtained these new solutions.
Some multipliers of DBCK-algebras
Authors: AYAR ÖZBAL Şule
Published: March 2022

The purpose of this document is to develop some of the basic theory of the multipliers algebra of dual BCK-algebras. In this study we demonstrate the concept of left bi-multiplier and right bi-multiplier of dual BCK (DBCK-algebra) algebras. Several examples and results pertaining to these multipliers on DBCK-algebras are developed based on these definitions. Then we study the characteristics of the bi-multipliers on DBCK-algebras and obtained some properties of DBCK-algebras. We focused on the behavior of the elements of DBCK-algebras under the concept of left bi-multiplier and right bi-multiplier of DBCK-algebras. We also characterize Kera(X) and Fixa(X) by bi-multipliers on DBCK- algebras. We describe some elementary related properties of these sets.
ECONOMIA COMPARTILHADA E MODO DE PRODUÇÃO CAPITALISTA NO CONTEXTO DOS APLICATIVOS DE ENTREGA
Authors: Palacios Rosiane Alves , Amaral Paola Reis do , Luciano Edimara Mezzomo , Santos Ana Clarissa Matte Zanardo dos
Published: March 2022

RESUMOAlgumas das características da economia compartilhada podem gerar novas dinâmicas nas relações de trabalho, por isso se faz importante entender se esse novo modelo de economia pode reforçar a precarização do trabalho. Por meio de entrevistas semiestruturadas com cinco entregadores vinculados a diferentes aplicativos de entrega de comida, o artigo buscou compreender se as empresas de aplicativos perpetuam práticas do modo de produção capitalista a partir da exploração da atividade de entregador. As análises foram realizadas a partir das categorias, a priori, de motivação, rotina, vantagens e desvantagens de realizar a atividade de entregador, ciência dos direitos trabalhistas, relacionamento com as empresas e a perspectiva de futuro em relação à atividade e a empregos formais. Como resultado foi possível identificar que mesmo que a economia compartilhada traga muitos ganhos para plataformas inovadoras, existe um contexto de forte desigualdade por trás do crescimento econômico que questiona o pilar social da sustentabilidade.Palavras-chave: Economia compartilhada. Modo de produção capitalista. Entregadores. Aplicativos. Bicicleta. ABSTRACTSome of the sharing economy characteristics generate new work relationships. Therefore, it is important to understand whether this new economic model can reinforce the already precarious nature of work. Through semi-structured interviews with five bike messengers from different delivery applications, the article sought to understand if application companies perpetuate the capitalist mode of production practices through the exploitation of the delivery activity. Analyses were carried out based on a priori categories related to motivation, routine, advantages, and disadvantages of performing the activity of delivery, awareness of labor rights, relationship with companies, and the future perspective of the activity and formal jobs. As a result, it was possible to identify that even though the sharing economy brings many gains for innovative platforms, there is a context of inequality behind this economic growth that questions the social pillar of sustainability.Keywords: Sharing economy. Capitalist mode of production. Deliveries. Applications. Bike messenger.
Traditions and their role in the development of family and society
Authors: Kabanova Kseniia Vladimirovna
Published: March 2022

The subject of this research is the traditions and their role in the development of family and society. The article raises the problem of loss of cultural-historical and family values, conservation and passing on goal leis in following the process of transmission of cultural, historical and socio-psychological experience from generation to generation through traditions. The article provides the theoretical analysis of modern research in the field of traditions; examines the concept and structure of the phenomenon of "tradition" and its formation. Special attention is given to family traditions as one of the factors of socio-psychological security of a family. The novelty consists in summarizing the material on the topic, introducing the authorial version of the definition of tradition, and resuming the development of family traditions as a factor of stability and psychological security of a family. In addition to temporal component (succession in generations), the acquired results allow outlining the value component of the tradition. The conclusion is made that traditions are an achievement and value of any community, any civilization and culture; while family traditions, playing the role of sociocultural practice of security, pass on family experience to succeeding generations, stabilize and structure life, form positive family identity, are essential for social adaptation, and affect confidence in life of an individual.
COVID-19, consulta y atención ginecológica: breve revisión
Authors: Díaz-Villadiego Angélica , Bustamante-Hernández Mabis
Published: March 2022

El objetivo del artículo fue revisar la literatura disponible sobre el SARS-CoV-2 relacionada con la consulta y atención ginecológica que surgió en 2020 y primer semestre de 2021. La metodología consistió en una revisión en las bases de datos electrónicas Pubmed, SciELO, Elsevier y Redalyc; así como en el buscador Google Académico, extendido a las referencias de los artículos encontrados. En términos de resultados, las consultas ginecológicas han sido restringidas a la asistencia a embarazadas, urgencias, pacientes oncológicas y posoperatorios. Han disminuido las revisiones de rutina y los tratamientos de fertilidad; las mujeres deben asistir sin acompañantes a la clínica, por su seguridad y la de todos; se redujo al mínimo su permanencia en el centro de salud, así como la duración de las visitas. Como conclusión, los centros de salud están siendo atendidos solo por el personal indispensable, guardando la protección exigida según la normativa, para cubrir la atención médica especializada; y se ha extremado la desinfección sistemática tanto de los consultorios como de las instalaciones de diagnóstico y tratamiento, incluidos los respectivos aparatos y equipos de alta tecnología; los ginecólogos especialistas deben estar conscientes del incremento en los casos de contagio con COVID-19 y, por ello, es importante estar preparados.
DEVELOPMENT OF TLC METHODS FOR IDENTIFICATION OF PHYTOSTEROLS IN ALCOHOL EXTRACT OF SALVIA LEAVES
Authors: Филимонова С.М. , Щепочкина О.Ю. , Мельников Е.С. , Садчикова Н.П. , Комарова А.А.
Published: March 2022

Разработана ТСХ методика стандартизации спиртового экстракта листьев шалфея. Идентификацию фитостеролов проводили с использованием -ситостерола стандартного образца. Проведенные исследования показали, что при детектировании спиртовым раствором ванилина сернокислого для более четкого разделения БАВ целесообразно использовать двухмерную хроматографию. Также возможна детекция раствором серной кислоты (1:3) в воде с последующим нагреванием. В этом случае пластинки рассматривали в УФ-свете при длине волны 254 нм. Значение Rf зоны фитостеролов около 0,6.

TLC method for standartisation of leaves Salvia offi cinalis alcohol extract was developed. Identifi cation of phytosterols was carried out using standard solution of -sitosterol. Studies have shown there are two ways of detection: sulfuric acid solution (1:3) in water and vanilin solution with subsequent heating. In case of detection with vanillin solution it is advisable to use two-dimensional chromatography, the plates were examined in UV light at a wavelength of 254 nm. The Rf value of the phytosterols zone is about 0.6.
THE ANALYSIS OF CLASSICAL ALGORITHMS FOR IMPLEMENTATION OF HYDRAULIC CALCULATIONS OF ISOTHERMAL HORIZONTAL SIMPLE PIPELINES TRANSPORTING REVERSE WATER-STEADY REGIME OIL EMULSIONS
Authors: Борисевич Ю.П. , Хохлова Н.Ю. , Краснова Г.З.
Published: March 2022

Осуществлен анализ существующих алгоритмов расчета трубопроводов, проведено сравнение расчетных показателей с экспериментальными, найдены границы применимости существующих алгоритмов, определена абсолютная ошибка для различных режимов течения.

The authors is carried out analysis of existing algorithms for calculating pipelines, the calculated parameters are compared with experimental ones, the applicability limits of existing algorithms are found, the absolute error for various fl ow regimes is determined.
PROBLEMS OF STATE REGULATION OF USE OF LANDS OF COASTAL TERRITORIES ON MATERIALS OF SPACE SURVEY
Authors: Портнов А.М. , Малинников В.А. , Мансбергер Р. , Бауэр Т.
Published: March 2022

Одной из особенностей государственного регулирования земельных ресурсов является установление ограничений в их использования. Это необходимое условие для соблюдения экологических и градостроительных норм, интересов общества и хозяйствующих субъектов. В связи с чем, следует говорить об актуальной задачи идентификации таких объектов, и, что самое главное, организации системы контроля за изменением их границ. Для Российской Федерации, несмотря на наличие огромных территорий, такие задачи актуальны для земель находящихся в интенсивном обороте и использовании. Современные методы получения материалов и данных об объектах местности, возможность их периодического обновления позволяю с максимальной оперативностью и минимальными затратами выявлять такие изменения. В данном исследовании продемонстрированы методы получения таких материалов и данных на примере объектов водного фонда, их значимость для установления ограничений в использовании прибрежных территорий. Также затронуты проблемы обновления картографической основы. Выявлены проблемы связанные с отсутствием стабильно работающей системы актуализации и верификации пространственных данных топографических карт различных масштабов. Хотя отчасти, такие процедуры, возможно, было бы, реализовывать на основе автоматизированных алгоритмов дешифрирования объектов местности. Тем самым, в целом, следует говорить о необходимости разработки и создания системы мониторинга границ природных и антропогенных объектов и явлений.

One of the features of state regulation of land resources is the establishment of restrictions in use. This is a requirement for compliance with environmental and planning regulations, social interests and business entities. In this connection, the identifi cation and documentation of such land resources is an essential task. In cases of constantly changing objects, the implementation of a system for monitoring the dynamic of their borders is important. Despite the existence of huge territories, land monitoring issues are relevant for the lands that are in intensive circulation and use in the Russian Federation. Modern methods based on remote sensing data of the Earth, their timely updating allow one to identify terrain feature changes at low cost and effi ciency. Methods of obtaining remote sensing data exemplifi ed be water resources, their importance for the establishment of restrictions in the use of coastal areas are demonstrated. The challenges of updating the cartographic base are considered in this article. Problems were identifi ed related to the lack of a stable system of updating and verifi cation of spatial data of topographic maps of different scales. Therefore, it is necessary to develop and establish a system for monitoring the changing boundaries of natural (anthropogenic) objects and activities on the land surface.
GODOGRAF OF SEISMIC WAVES OF EARTHQUAKES OF THE NORTHEAST OF THE BAIKAL RIFT
Authors: Тубанов Ц.А. , Санжиева Д.П.-Д. , Гилева Н.А. , Суворов В.Д.
Published: March 2022

Представлены предварительные результаты анализа сейсмологической базы данных о временах вступлений сейсмических волн землетрясений. Показано, что соотношение между наблюденными (в интервале эпицентральных расстояний до 100 км) и теоретическими (рассчитанными в одномерной модели коры) временами пробега волн на северо-востоке Байкальского рифта характеризуется невязками, достигающими 34 с. Основная причина таких расхождений определяется трехмерной неоднородностью коры и зависимостью от глубины гипоцентров. Цель работы заключается в разработке методики составления априорной трехмерной модели среды, которая позволит получить более определенные сведения о распределении глубины очагов землетрясений и их связи с тектоникой земной коры рифтовой зоны.

The preliminary results of the analysis of the seismological database on the times of seismic waves of earthquakes are presented. It is shown that the difference between the observed (in the interval of epicentral distances up to 100 km) and theoretical travel time curves (calculated in a one-dimensional model of the crust) in the North-East of the Baikal rift is characterized by residuals reaching 34 s. The aim of the work is to develop a methodology for compiling a priori three-dimensional model of the environment for more reasonable information about the earthquake foci distribution and their relationship with the tectonics of the rift zone earths crust.
CHARACTERISTICS OF ANALYSIS OF SURFACE DEFECTS OF THE TYPE OF DELAMINATIONS OF ASYMMETRIC STRUCTURE IN PANELS FROM COMPOSITE MATERIALS UNDER BIAXIAL COMPRESSION
Authors: Митрофанов О.В. , Клесарева М.В.
Published: March 2022

Рассмотрены особенности анализа испытаний конструктивно-подобных образцов панелей из композитных материалов с поверхностными дефектами типа расслоений с возможной несимметричной структурой. Приведено решение геометрически нелинейной задачи для исследования начального этапа поведения расслоения при двухосном сжатии, которое возникает при закреплении продольных кромок от перемещений.

The characteristics of the analysis are of tests of structurally similar coupons of panels made of composite materials with surface defects such as delamination with a possible asymmetric structure are shown. The solution of the geometrical nonlinear problem is given for studying the initial stage of the behavior of the delamination under biaxial compression, which occurs when the longitudinal edges are fi xed from displacement.
The letters of Protopresbyter Dimitri Petrovich Novsky to Archimandrite Leonid (Kavelin) 1873-1875 гг.
Authors: Зеленская Г.М.
Published: March 2022

Публикуются письма протопресвитера Димитрия Петровича Новского (1799-1879) к архимандриту Леониду (Кавелину; 1822-1891), настоятелю ставропигиального Воскресенского, Новый Иерусалим именуемого монастыря. Переписка двух видных деятелей Русской Православной Церкви велась в 1873-1875 гг., когда о. Леонид занимался составлением Главной Описи обители, включавшей описи ее церквей, ризницы и книгохранилища. Протопресвитер Димитрий, настоятель Успенского собора Московского Кремля, проверял эту работу как член Конторы Святейшего Синода. Его письма свидетельствуют о внимательном, вдумчивом отношении к документам, представлявшим собой подробный реестр монастырского имущества. Замечания протопресвитера, отраженные в переписке, помогли усовершенствовать структуру Описи, которая до настоящего времени остается эталонным образцом для аналогичных исторических источников. Вместе с тем переписка содержит подробности жизни и служения о. Димитрия. Эти детали характеризуют личность протопресвитера, впитавшую лучшие черты русского православного духовенства XIX столетия.

The letters of Protopresbyter Dimitri Petrovich Novsky (1799-1879) to Archimandrite Leonid (Kavelin; 1822-1891), abbot of the stavropegic Resurrection, New Jerusalem monastery, are published. Correspondence between two prominent figures of the Russian Orthodox Church was conducted in 1873-1875, when Fr. Leonid was engaged in the compilation of the Main Inventory of the monastery, which included the inventory of churches, sacristy and book depositories. Protopresbyter Dimitri, rector of the Assumption Cathedral of the Moscow Kremlin, checked this work as a member of the Office of the Holy Synod. His letters testify to the attentive, thoughtful attitude to the documents, which constituted a detailed register of the monastery property. His letters testify to the attentive, thoughtful attitude to the documents, which constituted a detailed register of the monastery property. The remarks of the Protopresbyter, reflected in the correspondence, helped to improve the structure of the Inventory, which to this day remains a reference model for similar historical sources. At the same time, the correspondence contains details of the life and ministry of Fr. Demetrius. These «little things» characterize the personality of the Protopresbyter, who reflected the best features of the Russian Orthodox clergy of the 19th century.
KARAKTERISASI FLAVONOID DARI DAUN MUNDU (Garcinia dulcis [ROXB.] KURZ) SEBAGAI PENGOMPLEKS Pb (II)
Authors: Sari Emilda , Widiyantoro Ari , Gusrizal Gusrizal
Published: March 2022

Pb (II) merupakan salah satu zat beracun dan berbahaya. Keberadaannya dalam tubuh manusia dapat mengganggu sistem metabolisme tubuh. Penelitian ini bertujuan untuk mengkarakterisasi flavonoid yang diisolasi dari daun mundu (Garcinia dulcis) sebagai pengompleks logam Pb (II). Tahapan penelitian yang dilakukan meliputi persiapan sampel kemudian ekstraksi, isolasi, dan pemurnian senyawa menggunakan metode kromatografi vakum cair (KVC), kromatografi kolom gravitasi (KKG), dan kromatografi lapis tipis (KLT), sedangkan identifikasi senyawa dilakukan menggunakan spektroskopi ultraungu-tampak (UV-Vis) dan inframerah (IR) serta 1H-NMR. Penelitian ini telah berhasil memperoleh 6 fraksi gabungan dari KVC dan 6 fraksi gabungan dari proses KKG. Pada fraksi F4.1 dari KKG dilakukan pemurnian lebih lanjut dengan metode kromatografi lapis tipis (KLT) preparatif sehingga diperoleh 5 isolat. Pada isolat F4.1.3 dilakukan pengujian keberadaan flavonoid dengan uji fitokimia dan hasilnya positif mengandung fenolik dan flavonoid. Selanjutnya isolat tersebut dilakukan pengujian aktivitas pengompleks terhadap logam Pb (II) 100 ppm, 200 ppm dan 300 ppm. Berdasarkan hasil pengujian UV-Vis, isolat F4.1.3 terdapat dua pita pada 287 nm dan 291 nm yang menunjukkan adanya karakteristik senyawa flavonoid. Pergeseran batokromik dari 287 nm dan 291 menjadi 289 dan 293 nm ini setelah penambahan Pb (II) menunjukkan bahwa isolat memiliki kemampuan mengkompleks Pb (II). Hasil analisis spektra inframerah (IR) dan 1H-NMR diduga isolat F41.3 adalah senyawa 5,8,4’–trihidroksi-flavan.
PENGARUH PENAMBAHAN JENIS DAN KONSENTRASI PLASTICIZER TERHADAP KUALITAS BIOPLASTIK BERBASIS SELULOSA DARI TANDAN KOSONG KELAPA SAWIT
Authors: Andahera Cindy , Sholikhah Isni , Islamiati Deah Ayu , Pusfitasari Memik Dian
Published: March 2022

Plastic is a material that commonly used in daily activities. The increasing of using plastic can increase the amount of plastic waste that can give a negative impact on environment. One effort to solve the problem is by replacing plastic material with a material that convenient degraded by soil, that’s called bioplastic. Bioplastic has a biodegradable characteristic and it is 67% compostable. One of the raw material to producing bioplastic is cellulose. Cellulose can be found in non-food plants such as woods, because most of them contain 40-45% cellulose. Oil palm is the one of the plants which is the cellulose taken by utilize oil palm empty fruit bunch. On the other hand, plasticizer must be added for producing bioplastic to make plastic has elastic characteristic. Sorbitol, Glycerol, Oleic Acid are types of plasticizer. In this research, bioplastic is producing by using solution casting method by addition of plasticizer. With these methods indicates that by using sorbitol as plasticizer is more suitable than glycerol and oleic acid. By using 30% v/v sorbitol can get the optimum quality of bioplastic with 58,7% mass reduction using degradation-analysis during 4 days, and maximum attraction which can be detained is 6,27 kPa
SINTESIS DAN AKTIVITAS ANTIKANKER SENYAWA C-4-ALILOKSI-3-METOKSIFENILKALIKS[4]RESORSINARENA
Authors: Sayekti Endah , Jumina Jumina , Siswanta Dwi , Mustofa Mustofa
Published: March 2022

The aims of this study was to synthesize of C-4-alyloxy-3-methoxyphenylcalix[4]resorcinarene (3). The syntheses was conducted  by condensation reaction of resorcinol with 4-allyloxy-3-methoxybenzaldehyde (2) in ethanol with hydrochloric acid as a catalyst. The (2) compound was synthesized by the reaction of the 4-hydroxy-3-methoxybenzaldehyde (vanillin) (1) via allylation reaction using an allylbromide with the sodium metal as a catalyst in ethanol. A (3) compound was orange solid. m.p. of 176–177 °C (dec.). Yield (78%). FTIR (KBr, ν; cm-1): 3441 (-OH); 3086 and 3008 (Csp2-H); 2939 (Csp3-H ); 1612 (C=C aliphatic); 1512 (C=C aromatic); 1427 (>CH- methine); 1234, 1211, 1080 and 1018 (C-O-C asymmetric); 925 (C=CH2 terminal). 1H-NMR (DMSO-d6; 500 MHz) δ (ppm): 8,50 (8H, s, OH); 6.43 (4H, s, ArC-H); 6,36-6,38 (4H, d, J=10 Hz); 6.32 (4H, s, ArC-H); 6.26-6.28 (4H, d, J=10 Hz); 6.13 (4H, s, ArC-H); 6.00-6.05 (4H, m, =C-H); 5.38-5.40 (4H, d, J=10 Hz); 5.31 (4H, s, >C-H methine); 5.16-5.18 (4H, d, J=10 Hz); 4.34-4.36 (8H, d, J=10 Hz); 3.29 (12H, s, -OCH3). 13C-NMR (DMSO-d6; 500 MHz) dC (ppm): 33 (4 x CH methine);  55 (4 x CH3); 69 (4 x CH2-); 101 (4 x ArC-H); 112 (4 x ArC-H); 113 (4 x ArC-H); 116 (4 x =CH allyl terminal); 120 (4 x ArC-H); 122 (8x ArC-); 132 (4 x ArC-H); 134 (4 x =CH allyl); 137 (4 x ArC-); 145 (4 x ArC-O); 148 (4 x ArC-O); 152 (8 x ArC-OH). MS (ESI) m/z: 1137.5 (M+). Anticancer evaluation was performed on (3) compound by MTT (3-(4,5-dimethyltiazole-2-yl)-2,5-diphenyltetrazolium bromide) method showed that (3) compound has a cytotoxic activity against HeLa and T47D cells which IC50 value respectively are 13,58 and 65,26 µg/mL.
ASAP CAIR DARI LIMBAH KULIT MANGROVE Avicennia alba UNTUK PENGAWETAN BAKSO IKAN (LIQUID SMOKE FROM MANGROVE SKIN WASTE Avicennia alba FOR THE PRESERVATION OF FISH BALLS)
Authors: Aritonang Anthoni Batahan , Wenisda Fransiska M , Sofiana Mega S
Published: March 2022

Liquid smoke has been successful pabricated from mangrove Avicennia alba shell by pyrolysis method at a temperature of 400℃ for 3 hours. Liquid smoke was purified by adsorption using activated kaolinite as adsorbent.  The test results showed that activated kaolinite could bring down the rancidness to become odorless and the color of liquid smoke from dark chocolate to gray colour. The composition of the liquid smoke compound was determined by using the Gass Chromatography-Mass  Spectrophotometer (GC-MS) consists of 2-propanone (CAS) acetone 25.79% and furan, tetrahydro- of 10.37% and carbamic acid, monoammonium salt (CAS) ammonium carbamate of 58.46% . The LC50 value of pure liquid smoke ranging from 1000 ppm is an indication that it is not toxic and safe to use for food preservation.  Activity test against the inhibition of microbial growth in fish meatballs, showed that ability. The higher the concentration of liquid smoke, the better the inhibition of microbial growth. Based on the results, it can be concluded that the liquid smoke produced from mangrove Avicennia alba shell purified by the activated kaolinite is very promising as a foodstuffs preservative
FOTODEGRADASI FENOL DALAM LEMPUNG TERPILAR TIO2 (PHOTODEGRADATION OF PHENOL ON TIO2-PILLARED-KAOLINITE
Authors: Silalahi Imelda H , Wahyuni Nelly , Irwan Irwan
Published: March 2022

Photodegradation of phenol on TiO2-pillared-kaolinite was observed. Pillarization of kaolinite was conducted through intercalation of polyoxotitanium sol into clay suspension followed by calcination giving TiO2-kaolinite which showed an increase in specific surface area and total pore volume compared with the kaolinite. The analysis of XRD demonstrated no significant change on d-space of second order of kaolinite structure associated with 2q 26.61°, but diffractions with regard to 2q 25.3° and 48.0° interpreted for TiO2 anatase were seen on the diffractogram of TiO2-kaolinite. The significant decrease of phenol concentration was observed in the presence of both kaolinite and TiO2-kaolinite under UV illumination (hn  ³ 365 nm) compare with the photoreaction without the kaolinite materials however the degradation rate of phenol on TiO2-kaolinite was faster than that on the kaolinite-only where 50% of phenol was consumed after 45 minutes of reaction. Kinetic study showed the photoreaction of phenol on TiO2-kaolinite follows the first order reaction with the reaction rate constant of 1.8 x 10-2 min-1.
EKSTRAKK UMBI BAWANG DAYAK (Eleutherine palmifolia (L.) Merr.) SEBAGAI PEREDUKSI ION PERAK DALAM SINTESIS NANOPARTIKEL PERAK
Authors: Rahayu Normaningsih , Gusrizal Gusrizal , Nurlina Nurlina
Published: March 2022

Silver nanoparticles (AgNPs) are one of the best plasmonic candidates that have been used in Surface Plasmon Resonance (SPR)-based nanosensors for the detection of metallic ions. In this research, AgNPs were prepared by the method using Eleutherine palmifolia (L.) Merr root ethanol extract. Silver nanoparticles were synthesized by reduction of silver nitrate with Eleutherine palmifolia (L.) Merr. Tuber extract (concentration of extract = 0,01%, pH = 11, volume ratio 1:1) in the boiling water bath for 90 minutes. The formation of silver nanoparticles was indicated by the appearance of yellow color and monitored using a UV-Visible spectrophotometer. The spectra showed the maximum peak at 401-405 nm. The resulted silver nanoparticles with the size of 10-20 nm were stable at least for 16 weeks.
KOMPOSISI UNSUR DAN KARAKTERISTIK MINERAL PASIR PUYA DARI SINTANG, KALIMANTAN BARAT (ELEMENT COMPOSITION AND MINERAL CHARACTERISTIC OF PUYA SAND FROM SINTANG, WEST KALIMANTAN)
Authors: Agustina Duwan , Nofiani Risa , Silalahi Imelda H
Published: March 2022

Puya sand is a byproduct from local gold mining activities found in Sintang, West Kalimantan. Puya sand is usually left by the miners after the mining activity leaving a pile of abandoned sands. Mineral characterisation conducted by using XRD and XRF methods demonstrated that the sand contains valuable elements and mineral, i.e. zircon silicate, quartz and ilmenite. A simple physical flotation separation method removed quartz remaining material containing concentrated zircon silicate. XRD analysis by using Search-Match followed by amount calculation by using Rietveld refinement showed that the sand consists of zircon silicate (58.3%), ilmenite (35.2%) and anatase (6.5%). Elemental analysis by using XRF presented the percentage of Zr, Ti, Fe and Si is 41.0, 23.9, 13.06 and 8.3, respectively. Hafnium with 1.5% was also observed along with Th, U and rare earth elements (REEs), such as Nd, Y, Eu, and Yb.
SENYAWA GOLONGAN STEROID DARI DAUN ADAM HAWA (Rhoeo discolor (L,Her.) Hance) DAN UJI SUN PROTECTING FACTOR STEROID COMPOUND FROM ADAM HAWA (Rhoeo discolor (L,Her.) Hance) LEAVES AND SUN PROTECTING FACTOR TEST
Authors: Anggelita Anggelita , Sayekti Endah , Destiarti Lia
Published: March 2022

The isolation of steroid compounds from Adam Hawa leaves has been carried out through maceration, partition, separation, and purification.  The relatively pure BF2 isolate was 7 mg amorphous and with a melting point of 158-1700C.  Results of 1H-NMR spectrum analysis with CDCl3 solvent, 500 MHz δH: 7,53 (d, J= 5,4 Hz, = C-H  ); 7,72 (d, J= 5,7 Hz, = C-H); 5,35 (1H, d, J=5,15 Hz, =C-H); 3,51 (1H, m, Ar-CH), 0,93 (d, J= 6,2 Hz, 3H), 0,86 (3H, s), 0,84 (3H, s), 0,81 (3H, m), 0,84 (d, J= 5,2 Hz, 3H). The 1H-NMR spectrum of isolate BF2 similar to the 1H-NMR spectrum of ergosterol peroxide and ergosterol. So it is predicted that BF2 isolate has resembled structures with those compounds. In vitro sunscreen tests were performed on BF2 isolates and methanol extracts using a UV-Vis spectrometer. The SPF values of BF2 isolate and methanol extract at concentrations (ppm) of 120, 140, 160 and 180 respectively were 1.913; 1,684; 2252; 2483; and also 1,428; 1,655; 2,465; 1883. The results showed that BF2 isolate and methanol extract had weak activity as sunscreen
PRODUKSI DAN KARAKTERISASI BIOCHAR AMPAS TEBU(Saccharum officinarum Linn) PRODUCTION AND CHARATERIZATION OF BAGASSE BIOCHAR (Saccharum officinarum Linn)
Authors: Suparnawati Suparnawati , Warsidah Warsidah , Harlia Harlia , Aritonang Anthoni Batahan
Published: March 2022

The production and characterization of bagasse biochar (Saccharum officinarum Linn) in this study was carried out through pyrolysis for 4 hours at a temperature of 1100C. The purpose of this research was to determine the biochar capacity of bagasse (Saccharum officinarum Linn) as an ameliorant for improving fertility in marginal lands, especially in West Kalimantan, namely peatlands. The capacity of biochar as an ameliorant in this study is known based on gravimetric analysis, which has a moisture content of 0.38%, ash content of 2.42%, volatile content of 0.53%, fixed carbon (cf) 97.02%. Meanwhile, from the results of SEM-EDX characterization there were 100% carbon compounds and the presence of pores in the form of micro pores. And the results of FTIR characterization have the absorption of functional groups of organic compounds at wave numbers (cm-1) 3448.72 from the Ogroup OH streching, 2978.09 and 2931.80 CH bending groups of cellulose compounds, 2368.59 and 2276 C≡C bending groups lingnin compounds and 1620.21 and 1435.04 groups of C=O and C=C streching compounds of lingninsellulose and hemicellulose
Nickel-Catalyzed Diversification of Phosphine Ligands by Formal Substitution at Phosphorus
Authors: Roediger Sven , Leutenegger Sebastian , Morandi Bill
Published: March 2022

We report a general diversification strategy for phosphines that enables the rapid discovery of new ligands. Alkylated phosphonium salts, prepared by standard alkylation of phosphines, are selectively dearylated in a nickel-catalyzed process to access alkylated phosphine products via a formal substitution at the phosphorus center. The reaction can be used to introduce a wide range of alkyl substituents into both mono- and bisphosphines. We also show that the alkylation and dearylation steps can be conducted in a one-pot sequence, enabling accelerated access to underexplored ligand space. The phosphine products of the reaction are converted in situ to air-stable borane adducts for isolation, and versatile derivatization reactions of these adducts are demonstrated.
Bioisostere Effects on the EPSA of Common Permeability-Limiting Groups
Authors: Ecker Andrew , Levorse Dorothy , Victor Daniel , Mitcheltree Matthew
Published: March 2022

Polar molecular surface area provides a valuable metric when optimizing properties as varied as membrane permeability and efflux susceptibility. The EPSA method to measure this quantity has had a substantial impact in medicinal chemistry, providing insight into the conformational and stereoelectronic features that govern the polarity of small molecules, targeted protein degraders, and macrocyclic peptides. Recognizing the value of bioisosteres in replacing permeation-limiting polar groups, we determined the effects of common amide, carboxylic acid, and phenol bioisosteres on EPSA, using matched molecular pairs within the Merck compound collection. Our findings highlight bioisosteres within each class that are particularly effective in lowering EPSA and others which, despite widespread use, offer little to no such benefit. Our method for matched-pair identification is generalizable across large compound collections and thus may constitute a flexible platform to study the effects of bioisosterism both in EPSA and other in vitro assays.
Isothermal self-assembly of multicomponent and evolutive DNA nanostructures
Authors: Rossi-Gendron Caroline , El Fakih Farah , Nakazawa Koyomi , Chocron Léa , Endo Masayuki , Sugiyama Hiroshi , Morel Mathieu , Rudiuk Sergii , Baigl Damien
Published: March 2022

Self-assembly is both an advantageously spontaneous process to organize molecular or colloidal entities into synthetic functional superstructures and a key-feature of how life builds its components. However, compared to their living counterparts, synthetic materials made by self-assembly usually lack some of the interesting properties of living systems such as multicomponent character or capability to adapt, transform and evolve. Here we describe an isothermal multicomponent DNA self-assembly method that recapitulates all these characteristics and leads to user-defined objects with programmable shape, site-specific function, intrinsic reconfigurability and unprecedented capacity of major transformation and shape evolution. Using a generic magnesium-free buffer containing NaCl, we show that a complex cocktail of hundreds of different DNA strands can spontaneously assemble at room or body temperature to form desired DNA origamis of various shapes with site-specific protein functionalization, extended nanogrids or single-strand tile-assemblies. In situ atomic force microscopy allows us to follow the self-assembly process and demonstrate that DNA origami assembly proceeds through multiple folding pathways, the system escaping kinetic traps until it reaches its equilibrium target structure. We also show that, under thermodynamic control, this method allows a given system to self-select its most stable shape in a large pool of competitive DNA strands. We finally demonstrate the first giant morphological transformation of DNA origamis spontaneously evolving at constant temperature from one shape to a radically different one by the massive exchange of all its constitutive staple strands. This method greatly expands the repertoire of shapes and functions attainable by isothermal self-assembly as well as provides tools to design evolutive DNA assemblies, with applications ranging from directed or self-adaptive morphological changes to nanostructure optimization by evolution.
Silver-Catalyzed [4+3] Cycloaddition of 1,3-Dienes with Vinyl-N-triftosylhydrazones: A Practical Approach to 1,4-Cycloheptadienes
Authors: Liu Shaopeng , Liu Zhaohong , Bai Huricha , Li Shuang , Giuseppe Zanoni , bi xihe
Published: March 2022

The first formal [4+3] cycloaddition of 1,3-dienes with vinyl-N-sulfonylhydrazones has been achieved by virtue of easily decomposable vinyl-N-triftosylhydrazones in the presence of silver catalysis. A series of acyclic and cyclic 1,3-dienes reacted effectively with silver(I) non-acceptor vinyl carbenes, including alkyl- and alkenyl-substituted carbenes, which are notoriously challenging, producing a broad spectrum of 1,4-cycloheptadienes with high yield and predictable stereochemistry. The products resulting from the herein described transformation include bridged and fused polycyclic systems, as well as the natural product dictyopterene C' and its isomer ectocarpene. The reaction mechanism and the origin of stereoselectivity were investigated via experimental work and density functional theory calculations.
Cost and performance targets for fully electrochemical ammonia production under flexible operation
Authors: Lazouski Nikifar , Limaye Aditya , Bose Abhishek , Gala Michal L , Manthiram Karthish , Mallapragada Dharik
Published: March 2022

Methods to produce ammonia from air, water, and renewable electricity are necessary to transition ammonia production away from the CO2-emitting Haber-Bosch process. In this vein, a fully electric process in which water-splitting-derived hydrogen and air-separation-derived nitrogen are reacted in an electrochemical process to produce ammonia is attractive. Such a process has the potential to be highly flexible and utilize intermittent renewable energy well. Here, we evaluated the cost-effectiveness of large-scale fully electric ammonia production relying on renewable electricity sources in conjunction with different types of storage and flexible operation, using a mixed-integer linear programming framework. The approach incorporates a first-principle, chemistry-independent representation of reactor power consumption and its dependence on reactor sizing and electrochemical parameters, the impact of product separation and recycling unconverted reactants, and plant dynamics in response to temporal variability in renewable energy availability. Given the emerging nature of electrochemical ammonia synthesis from nitrogen and hydrogen, we used the model to identify the reaction descriptors and their threshold values that enable cost parity between fully electric ammonia production with commercially viable production using thermochemical synthesis coupled with electrolytic hydrogen powered by renewable energy. We found that ammonia can be produced in an economically competitive manner, i.e. at costs <1 $/kg, at large scales if the electrochemical reactor can produce ammonia at partial currents exceeding 400 mA cm-2, energy efficiencies exceeding 30%, and process lifetimes of several years. In light of this, novel chemistries that can reduce nitrogen at high rates and moderate (<2.5 V) overpotentials are necessary for economic, large-scale ammonia production.
Knowledge-sharing to enhance global health equity
Authors: Cheng Breagh , Chaudhry Salma , Cheng Brianna
Published: March 2022

Knowledge produced by specialized professionals can be shared to promote public understanding and decision-making. During the COVID-19 pandemic, the application, translation, and dissemination of specialized knowledge has informed global policy responses and contributed to new vaccine technologies that protect against disease. However, the pandemic has also highlighted the potential impacts that ineffective knowledge dissemination and misinformation can have on health outcomes, which can further deepen health inequities between groups. Preliminary considerations are suggested for ways to foster a culture of knowledge sharing aimed at promoting global health equity.
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Authors: Prakash Gnana
Published: March 2022

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LA GESTIÓN DE LA CADENA DE SUMINISTROS PARA MEJORAR PROCESOS LOGÍSTICOS EN LA EMPRESA SERVICIO L&C DEL PERÚ, LIMA - 2020
Authors: Domínguez Malaver Carlos Andrés , Villanueva Calderón Juan Amílcar
Published: March 2022

La presente investigación se realizó en la empresa Servicio L&C del Perú SAC, Lima - 2020; se planteó como objetivo general, proponer un Plan de Gestión de la Cadena de Suministros para mejorar los Procesos Logísticos en la empresa Servicio L&C del Perú SAC, 2020. La formulación del problema responde a la siguiente pregunta: ¿Cómo mejorar los procesos logísticos en la empresa Servicio L&C del Perú SAC, 2020? La metodología es de tipo descriptivo - propositivo con diseño no experimental - transversal con un enfoque cuantitativo, para el análisis de los resultados y la interpretación de estos se utilizó la encuesta aplicada sobre una muestra de 20 colaboradores de la empresa Servicio L&C del Perú. Los resultados de la investigación mostraron que, con que respecto al estado actual de los procesos logísticos en la empresa Servicio L&C del Perú SAC, 2020, se logró evidenciar que, dichos procesos se encontraban en un nivel regular (80%), influenciado por los niveles regulares de estrategias de selección de proveedor (85%), estrategias de administración de productos (80%) y la gestión logística misma (75%). Se concluye que, el Plan de Gestión de la Cadena de Suministros mejorará los procesos logísticos en la empresa Servicio L&C del Perú SAC, 2020.
MODELO FILOSOFÍA DE NIÑOS PARA EL DESARROLLO DEL PENSAMIENTO CRÍTICO-CREATIVO EN ESTUDIANTES DE EDUCACIÓN PRIMARIA DE CUTERVO
Authors: Carranza Montenegro Maribel Soledad
Published: March 2022

El presente trabajo de innovación educativa tuvo como objetivo construir un modelo de Filosofía de niños, para el desarrollo del pensamiento crítico-creativo, en los estudiantes del sexto grado de educación primaria de las IIEE N°10234 y 10237, de Cutervo. El estudio es de tipo básico, con diseño descriptivo propositivo y con enfoque metodológico cuantitativo; donde participaron 43 estudiantes, seleccionados de forma probabilística, a los cuales se les administró un cuestionario de medición en torno al pensamiento crítico-creativo en sus dimensiones investigación, conceptualización, razonamiento, traducción y percepción.  Cuyos resultados indicaron que el desarrollo del pensamiento crítico-creativo en la mayoría de estudiantes se ubica en el nivel regular, lo que significa que no alcanzaron a desarrollar como se esperaba las dimensiones del pensamiento indicado. Se concluye señalando que el desarrollo del  pensamiento crítico-creativo se encuentra en proceso de logro y para fortalecerlo se deben aplicar estrategias  relevantes como el modelo de filosofía de niños, potente recurso que exige partir de la lectura de un texto propio del contexto de los estudiantes, provocando diversas interrogantes que dan inicio a la discusión, desplegando una serie de indagaciones y conflictos cognitivos, permitiendo que los estudiantes desarrollen las habilidades del pensamiento crítico-creativo.
RESILIENCIA EN ADOLESCENTES INTERNADOS EN UN CENTRO JUVENIL DE LA CIUDAD DE PIURA: UN ESTUDIO INSTRUMENTAL Y DESCRIPTIVO
Authors: Remaycuna Vasquez Alberto
Published: March 2022

El objetivo de esta investigación fue establecer los procesos psicométricos de la escala de resiliencia, para poder identificar los niveles de resiliencia que presentan los adolescentes internados en un centro juvenil de la ciudad de Piura. Fue de tipo aplicada, descriptiva de corte transversal con un diseño instrumental, la muestra estuvo compuesta por 132 adolescentes con edades de 14 a 18 años, se les administró la escala de resiliencia compuesta por 25 reactivos. Los resultados psicométricos mostraron un KMO de 0.88, dentro del análisis factorial se han obtenido 4 dimensiones con un valor absoluto de 0.35; la validez convergente presentó valores de 0.60; la confiabilidad general de Omega fue superior a 0.80; las normas percentilares han presentado tres categorías: Bajo, promedio y alto. Los resultados descriptivos mostraron que, los más altos porcentajes (70,4%) de adolescentes presentaron niveles regulares y bajos de resiliencia, lo que implica que existen dificultades para lograr adaptarse y sobreponerse ante las situaciones adversas o   fracasos en alguna actividad o proyecto que emprendan. En conclusión, la escala de resiliencia ha resultado siendo válida en toda su extensión, en consecuencia, es factibles su uso como instrumento de evaluación y diagnóstico.
APRENDIZAJE – SERVICIO EN LOS ESTUDIANTES DE EDUCACIÓN UNIVERSITARIA
Authors: Valle Castillo Sandra Maritza , Chanamé Chira Ricardo , Rojas Zuñiga Susana Astrid , Barrientos López Patricia Emperatriz , López Regalado Oscar
Published: March 2022

El siguiente artículo tiene como objetivo analizar  el  Aprendizaje Servicio a nivel de malla curricular en los estudiantes universitarios. La metodología empleada se basó en la revisión sistemática, con un enfoque cualitativo, retrospectivo de tipo bibliométrico. Para el análisis de los artículos científicos se utilizó los operadores booleanos AND, OR, con un período intervalo desde 2016 al 2021 y como método de inclusión y exclusión se logró seleccionar artículos difundidos en revistas indexadas a Scopus, Ebsco y Eric. Entre los criterios de análisis figuran los autores que investigan el tema aprendizaje servicio, tipo de revista, el enfoque utilizado, el diseño y las técnicas e instrumentos utilizados. Como resultado de la investigación se puede precisar que existen trabajos cualitativos, utilizando técnicas para obtener información como cuestionario, entrevistas, análisis documental, encuestas, e instrumentos; siendo en España el país que se encuentra con mayor incidencia  de estudios sobre este tipo de investigación. Se concluye que, de la revisión de los artículos abordados, que el aprendizaje servicio es usado en algunas universidades como parte de la malla curricular y otros como servicios sociales es decir extracurriculares.
DIAGNÓSTICO DEL NIVEL DE COMPRENSIÓN LECTORA EN ESTUDIANTES DE SECUNDARIA
Authors: Martínez Ubillús Juilianna Julissa , Carrión Barco Gilberto
Published: March 2022

La presente investigación buscó diagnosticar el nivel de comprensión lectora en estudiantes de educación secundaria, caracterizándola a partir de capacidades conexas: la oralidad, el placer por la lectura y el pensamiento crítico. Se asumió el enfoque cuantitativo con diseño no experimental, descriptivo. La técnica de recolección de datos fue la encuesta mediante un cuestionario suministrado a 35 estudiantes de cuarto año secundaria de una institución educativa pública en una provincia del norte peruano, procesándose mediante SPSS- V-25. Los hallazgos estadísticos determinaron que las tres dimensiones evidencian niveles preocupantes de comprensión lectora, puesto que en comprensión literal se obtuvo el 57%, la comprensión inferencial 74% y la crítico-valorativa 74%, concluyéndose que en la institución educativa bajo estudio se encuentra en el nivel de inicio en comprensión lectora.