bluuebunny/crossref_metadata_2025 huggingface dataset:
Dióxido de chumbo eletrodepositado sobre grafite como sensor potenciométrico a ions chumbo e sulfato
Authors: Cassiano Neila Maria , Ramos Luiz Antônio , Capelato Milton Duffles
Published: July 2023

No presente trabalho, foi desenvolvido um eletrodo de PbO2 eletrodepositado sobre grafite a partir do eletrólito metanosulfonato de chumbo-ácido metanosulfônico contendo o agente tensoativo brometo de cetiltrimetilamônio (BCTA). Foram avaliadas a resposta potenciométrica do eletrodo de PbO2 como sensor à íons Pb2+ e SO42-, em pH e força iônica constante. A aplicação deste eletrodo em titulações potenciométricas de precipitação em meio hidro-etanólico também foi investigada. Os resultados demonstraram que o eletrodo de PbO2 eletrodepositado pode ser utilizado como sensor potenciométrico alternativo à íons Pb(II) apresentando uma linearidade na faixa de concentração de 3,98x10-4 a 3,09x10-2 mol L-1 em meio de íons nitrato com limite de detecção de (4,98 ± 0,11)x10-4 mol L-1. Para íons sulfato o eletrodo de PbO2 não responde diretamente porém, estes íons podem ser dosados indiretamente por titulação potenciométrica com solução padrão de Pb(II), em meio ácido, em uma mistura 1:1 (v/v) de etanol-água, com boa definição dos volumes de equivalência. A repetitividade dos potenciais e dos volumes de equivalência obtidos em amostras de concentração milimolar em sulfato, indicam a viabilidade deste eletrodo na dosagem de íons sulfato.
Potencialidades e aplicações do ligante dietilditiofosfato de amônio em análises químicas
Authors: Fernandes Andréa Pires , De Moraes Mercedes , Gomes Neto José Anchieta
Published: July 2023

Este trabalho descreve uma revisão a respeito do uso do ligante dietilditiofosfato de amônio em química analítica e suas potencialidades no campo da análise química espectrofotométrica (UV/VIS) e espectrométrica (AAS, ICP-AES, ICP-MS) em diferentes matrizes e meios. A discriminação de espécies químicas por meio de complexações seletivas de elementos químicos com dietilditiofosfato e a hifenação de técnicas espectroscópicas a etapas de separação como extração em fase sólida, extração líquido-líquido, extração por "cloud point", são outros assuntos abordados neste trabalho.
Construção de pilhas elétricas simples - um experimento integrado de química e física
Authors: De Oliveira Luiz Antonio Andrade , Valle Gisele Gomes , Zanluqui Luís André
Published: July 2023

Neste artigo são descritas formas simples e de baixo custo de se montar pilhas, empregando-se placas de zinco, magnésio e cobre mergulhadas diretamente nas soluções eletrolíticas. Como soluções eletrolíticas podem ser empregadas suco de frutas cítricas, ou mesmo apenas água de torneira. A tensão e corrente produzidas pelas pilhas montadas são suficientes para acionar dispositivos com baixa demanda de potência, como relógios analógicos e digitais . Os experimentos podem ser explorados como simples demonstração de transformação de energia química em elétrica para alunos do nível fundamental, ou utilizados como práticas interdisciplinares de Física e Química para alunos mais avançados.
Model studies on the synthesis of the natural meroterpenoid cordiaquinone A
Authors: Batalini Claudemir , Bieber Lothar Wilhelm
Published: July 2023

Two main strategies for the synthesis of the natural meroterpenoid cordiaquinone A (1) - isolated of the roots of Cordia corymbosa G. Don (Boraginaceae) - were tested on model compounds. Whereas all attempts of alkylation of e-caprolactone (10) were unsuccessful, the coupling of epoxycitronellol (17) with an appropriate organocuprate proceeded in the expected direction.
Statistical model to DNA melting
Authors: Augusto Paulo Sergio Pilz , Drigo Filho Elso , Ruggiero Jose Roberto
Published: July 2023

We explore a DNA statistical model to obtain information about the behavior of the thermodynamics quantities. Special attention is given to the thermal denaturation of this macromolecule.
Thermoanalytical study of the complexes of 4-dimethylaminocynnamylidenepyruvate with manganese (II), cobalt (II), nickel (II), copper (II), zinc (II) and lead (II), in the solid state
Authors: Schnitzler Egon , Lazzarotto Márcio , Carvalho-Filho Marco Aurelio da Silva , Ionashiro Massao
Published: July 2023

Solid state compounds M-4-DMCP, where 4-DMCP is 4-dimethylaminocinnamylidenepyruvate and M represents Mn (II), Co (II), Ni (II), Cu (II), Zn (II) and Pb (II) were prepared. These compounds were studied by thermoanalitycal techniques: thermogravimetry (TG), derivative thermogravimetry (DTG), differential scanning calorimetry (DSC), X-ray diffraction powder patterns and complexometric titration with EDTA. From the results obtained by the complexometric titration with EDTA, TG, DTG and DSC curves, was possible to establish the hydration degree, stoichiometry and thermal stability of the prepared compounds.
Cinética de dissolução da superfície de aço SAE-AISI 1005 em meio ácido
Authors: Magnani Marina , Fugivara Cecílio Sadao , Garcia Roberto , Benedetti Assis Vicente
Published: July 2023

O setor automotivo é um dos mais competitivos e um grande consumidor de materiais ferrosos, que exigem uma eficiente proteção contra a corrosão. Esta proteção é alcançada aplicando revestimentos adequados. Para se aplicar revestimentos se requer uma cuidadosa preparação da superfície que pode ser feita por ataque químico. Neste trabalho, determinou-se a velocidade de reação do aço extra-doce, SAE-AISI 1005, laminado a frio (CFF) utilizando várias soluções ácidas, de baixo custo, baixa agressividade ao meio ambiente e que geram pouco hidrogênio. O estudo cinético foi realizado medindo-se a perda de massa (deltam/mg cm-2) de chapas de aço CFF em função do tempo (s) de reação nas diferentes soluções, com e sem agitação, a 30ºC. Os resultados foram interpretados considerando-se os efeitos de transporte de massa, o efeito oxidante dos íons Me3+ e inibidor dos íons Fe2+. Dentre as várias soluções estudadas a que apresentou maior velocidade de reação foi a solução de H2SO4 2 M + MeCl3 1 M, v = 15,44 x 10-6 g cm-2s-1 para tempos até 1800 s.
Determinação de zinco em álcool combustível opr voltametria de redissolução anódica
Authors: De Oliveira Marcelo Firmino , Saczk Adelir Aparecida , Okumura Leonardo Luiz , Stradiotto Nelson Ramos
Published: July 2023

A presença de metais pesados em álcool combustível origina-se na produção e armazenamento do álcool etílico, constituindo uma contaminação inorgânica. A análise quantitativa deste contaminante tem sido usualmente monitorada empregando-se técnicas convencionais de análise tal como espectrofotometria de absorção atômica. Tendo em vista a alta sensibilidade das técnicas voltamétricas de redissolução anódica para a quantificação de metais e que poucos estudos foram realizados para este tipo de matriz, este trabalho tem por objetivo desenvolver uma metodologia eletroanalítica para a determinação de zinco em álcool combustível. A determinação eletroquímica para o zinco em meio aquoso utilizando-se a modalidade de varredura linear exibe uma corrente de pico anódica em um potencial de -1,12 V vs. ECS, apresentando uma dependência linear em relação à concentração de zinco no intervalo de 5,0x10-7 a 5,0x10-6 mol.L-1 com uma sensibilidade amperométrica de 1,2x10(6) miA.mol-1.L e um limite de detecção de 2,6x10-7 mol.L-1. A análise de íons zinco em amostra comercial de álcool combustível foi determinada pela adição de 200 miL de amostra em um volume final de 20 mL de eletrólito-suporte, sendo obtida a concentração de zinco na amostra pelo método de adição de padrão com um valor correspondente a 5,7± 0,19x10-5 mol.L-1 em zinco.
Eletrodo modificado em filme de paládio para a determinação voltamétrica de fosfito
Authors: Ito Helenice Akemi , De Oliveira Marcelo Firmino , Gomes Neto José Anchieta , Stradiotto Nelson Ramos
Published: July 2023

Os íons fosfito constituem um importante componente inorgânico como fonte de fósforo na fertilização de solos, apresentando incontáveis vantagens em relação ao fosfato. A determinação desse ânion em produtos fertilizantes é usualmente realizada empregando-se método clássico de análise como gravimetria, sob a forma de pirofosfato de magnésio ou pela formação de cloreto mercuroso. Entretanto, existem algumas desvantagens nesta metodologia, como a necessidade de um elevado tempo de digestão e a possível produção de resíduos tóxicos. Sendo assim, este trabalho teve como objetivo propor uma metodologia eletroquímica alternativa para a determinação de fosfito. A modificação eletroquímica na superfície de eletrodos de platina realizada por eletrodeposição de paládio apresentou efeito catalítico para a oxidação de íons fosfito a fosfato em meio de ácido sulfúrico 1,0 mol.L-1. Uma dependência linear em relação à concentração de fosfito foi obtida no intervalo de 5,0x10-6 a 5,0x10-4 mol.L-1 tendo uma sensibilidade amperométrica de 8,5x10(4) miA.mol-1.L e um limite de detecção de 3.67x10-6 mol.L-1.
Luminóforo azul preparado a partir do método de combustão
Authors: Gomes Janaína , Serra Osvaldo Antonio , Pires Ana Maria
Published: July 2023

Neste trabalho, o luminóforo azul Sr2CeO4 é preparado a partir de um precursor multicomponente na forma de pó via método de combustão, variando-se o combustível, resultando num pó de partículas finas. A utilização de ácido cítrico ou glicina como combustível leva à formação de composições diferentes, que após tratamento térmico a 950ºC, convertem-se em um material com predominância da fase Sr2CeO4. A emissão de luz branca azulada é somente observada nas amostras após tratamento térmico, e seus espectros de excitação e de emissão são idênticos e característicos da fase luminescente Sr2CeO4. Portanto o método de combustão é apropriado para preparação de luminóforos azuis.
Estudo da secagem de materiais hibridos siloxano-PMMA preparados pelo processo sol-gel
Authors: Sacco Ana Paula , Dahmouche Karim , Santilli Celso Valentim , Pulcinelli Sandra Helena
Published: July 2023

Híbridos siloxano-PMMA apresentando ligações covalentes entre as fases orgânica e inorgânica foram preparados a partir do processo sol-gel. O efeito da fração em massa de fase siloxano no mecanismo de secagem dos géis a 50oC foi estudado através de medidas de perda de massa e retração linear. Pode-se distinguir os três períodos clássicos de secagem já observados em géis inorgânicos. A duração do primeiro período (estágio de velocidade constante) aumenta com o teor de polímero, o que pode ser explicado pelo menor tamanho dos poros presentes nos géis contendo concentrações elevadas de PMMA. Com o aumento da concentração da fase siloxano observou-se o aumento da perda de massa total e da retração linear final do material após o terceiro período de secagem. Este comportamento deve-se ao aumento do teor de água livre resultante da policondensação das espécies siliciosas nestes sistemas, o que leva a uma maior plasticidade do material. O volume poroso do material aumenta com o teor de fase siloxano, o que é consistente com a perda de massa observada durante a secagem.
Estudo da adsorção/dessorção de 2,4-D em solos usando técnica cromatográfica
Authors: De Amarante Junior Ozelito Possidônio , Brito Natilene Mesquita , Rodrigues dos Santos Teresa Cristina , Ribeiro Maria Lúcia
Published: July 2023

Este trabalho estudou a adsorção e a desorção do herbicida ácido 2,4-Diclorofenoxiacético (2,4-D) em solo da região de Urbano Santos - MA. A região possui campos de cultivo de eucaliptos para obtenção de celulose. Para a limpeza dos campos, antes da plantação e nos primeiros 12 meses de plantio, são aplicados herbicidas, dentre os quais destacamos o 2,4-D. A isoterma de Freundlich foi utilizado como modelo para este estudo e a concentração de 2,4-D foi determinada por cromatografia líquida de alta eficiência (CLAE), acompanhada de ensaios de recuperação para garantir a confiabilidade dos dados obtidos na investigação de adsorção/dessorção. Os resultados indicaram que o 2,4-D apresenta maior adsorção à matéria orgânica do solo estudado, quando comparado a outros tipos de solo, o que pode resultar em pequena diminuição em sua tendência de lixiviação e de degradação microbiológica. Entretanto, este herbicida apresenta elevado potencial de lixiviação quando comparado a outros pesticidas.
Óxido de zinco dopado com gálio preparado pelo método Pechini
Authors: Gonçalves Agnaldo de Souza , De Lima Sergio Antonio Marques , Davolos Marian Rosaly
Published: July 2023

Óxido de zinco dopado com gálio (ZnO:Ga) foi preparado pelo método Pechini a partir de citrato de zinco e hidróxido de gálio. Utilizsando este método, foi possível obter ZnO:Ga cristalino pela calcinação do precursor polimérico em ar a 900ºC por 4 horas. A resina homogênea contendo 2% de dopante só pôde ser obtida com a adição de ácido etilenodiaminotetracético (edta). A adição do edta, também, ocasionou a diminuição de tamanho de partícula do óxido.
Efeito do tipo e tempo de agitação na atividade catalítica de rutenioporfirina
Authors: Guimarães Christian Alexander , De Moraes Margarida
Published: July 2023

Neste trabalho, o complexo (carbonil)[tetrakis(5,10,15,20-ortobromofenil)porfirinato]rutênio(II) foi sintetizado e estudado como catalisador na oxidação de cicloexano por iodosilbenzeno. Em tal estudo variou-se as condições do sistema a fim de se verificar o melhor tempo e meio de agitação (mecânica e/ou sonicação). Os resultados demonstram boa eficiência, seletividade e regeneração do catalisador quando se utiliza um sistema misto de agitação.
Análise exploratória dos teores de constituíntes inorgânicos em sucos e refrigerantes de uva
Authors: Ferreira Edilene Cristina , Rodrigues Silvia Helena Bonfim Gomes , Ferreira Márcia Miguel Castro , Nóbrega Joaquim Araújo , Nogueira Ana Rita Araujo
Published: July 2023

Os teores de Ca, Cu, K, Mg, Na, P e S foram determinados simultaneamente em sucos e refrigerantes de uva utilizando espectrometria de emissão óptica com plasma de argônio induzido (ICP-OES) como técnica analítica. Os dados obtidos foram submetidos à dois métodos de análise exploratória: análise de componentes principais (PCA) e análise de hierárquica de agrupamentos (HCA). Os resultados mostraram que o Na foi o principal elemento para discriminação entre as amostras, diferenciando principalmente sucos e refrigerantes. A adição de conservantes e o teor de sais minerais também foram aspectos relevante para a discriminação dos grupos. A análise exploratória mostrou-se útil para o tratamento dos dados em questão, produzindo informações que dificilmente seriam visualizadas diretamente na matriz de dados.
Discriminação geográfica de águas minerais do Estado de São Paulo pela análise exploratória
Authors: Silva Fernando Vitorino , Kamogawa Marcos Yassuo , Ferreira Márcia Miguel Castro , Nóbrega Joaquim Araújo , Nogueira Ana Rita Araujo
Published: July 2023

A correlação e agrupamento de águas minerais de diferentes regiões do estado de São Paulo foi realizada utilizando análise exploratória de valores de pH e teores de Ba, Ca, K, Mg, Na e V. Utilizando a análise de componentes principais e a análise de agrupamento hierárquico avaliou-se a similaridade das amostras de água mineral pela formação de grupos que foram diretamente correlacionados com suas procedências. Utilizaram-se scores que fornecem a composição das componentes principais em relação as amostras e loadings que fornecem essa mesma composição em relação às variáveis. Observaram-se a formação de dois grupos e a separação de amostras provenientes de Ibirá e Itu. O primeiro grupo é composto por amostras da região da Serra da Mantiqueira (Águas da Prata, Campos do Jordão e Lindóia) e o outro é formado por amostras de cidades localizadas acima do Aquífero Guarani (Águas de Santa Bárbara, Palmares Paulista, Presidente Prudente, São Carlos, São Simão e Santa Rosa do Viterbo). A segregação das amostras de Ibirá se deveu à presença predominante de Na e V em sua composição mineral, já nas amostras de Itú observou-se maior contribuição de elementos Ba, Ca e Mg; Correlacionando a composição química com a localização geográfica das amostras.
NEW METHODOLOGY TO SYNTHESIS 3- SECONDARY AMINES OF IMIDAZOBENZOTHIAZOLE DERIVATIVES WITH STUDY THEIR BIOLOGICAL ACTIVITIES
Authors:   1Assist. Luc. Dept. of Chemistry, College of Sciences, Univ. of Baghdad, Baghdad, Iraq. Abduljabar.m89@gmail.com, Maged Abdul Gabar Abdul , AL-Lami Naeemah ,   2 Prof. Dr. Dept. of Chemistry, College of Sciences, Univ. of Baghdad, Baghdad, Iraq. naeemah.owaid@sc.uobaghdad.edu.iq
Published: July 2023

In this research, new derivatives of bicyclic fused rings containing bridgehead nitrogen atom imidazo/benzothiazole were prepared from 2-aminobenzothiazole with 2-bromo-1-(4-bromophenyl)ethan-1-one to form compound A1. Then, through the Mannich reaction, compound A2 was prepared from compound A1 with formaldehyde and 4-aminoacetophenone. Schiff bases A3-A6 were prepared from condensation reaction between compound A2 with different amines. Finally, the reduction reaction was accomplished by using NaBH4 to reduce the imine group to forming new compounds A7-A10. These compounds were characterized by FTIR, 1HNMR, and 13CNMR. The prepared compounds showed biological activity against some microorganisms.
Development of an Algorithm for Multicriteria Optimization of Deep Learning Neural Networks
Authors: Alexandrov Islam A. , Kirichek Andrey V. , Kuklin Vladimir Z. , Chervyakov Leonid M.
Published: July 2023

Nowadays, machine learning methods are actively used to process big data. A promising direction is neural networks, in which structure optimization occurs on the principles of self-configuration. Genetic algorithms are applied to solve this nontrivial problem. Most multicriteria evolutionary algorithms use a procedure known as non-dominant sorting to rank decisions. However, the efficiency of procedures for adding points and updating rank values in non-dominated sorting (incremental non-dominated sorting) remains low. In this regard, this research improves the performance of these algorithms, including the condition of an asynchronous calculation of the fitness of individuals. The relevance of the research is determined by the fact that although many scholars and specialists have studied the self-tuning of neural networks, they have not yet proposed a comprehensive solution to this problem. In particular, algorithms for efficient non-dominated sorting under conditions of incremental and asynchronous updates when using evolutionary methods of multicriteria optimization have not been fully developed to date. To achieve this goal, a hybrid co-evolutionary algorithm was developed that significantly outperforms all algorithms included in it, including error-back propagation and genetic algorithms that operate separately. The novelty of the obtained results lies in the fact that the developed algorithms have minimal asymptotic complexity. The practical value of the developed algorithms is associated with the fact that they make it possible to solve applied problems of increased complexity in a practically acceptable time. Doi: 10.28991/HIJ-2023-04-01-011 Full Text: PDF
Ciudades y mercaderes: tiempo moderno y complejización social en las obras de Moishe Postone y Norbert Elias
Authors: Labajos Sebastian Vidal
Published: July 2023

En el presente artículo, quiero comparar las propuestas teóricas de Norbert Elias y Moishe Postone en torno al surgimiento y la naturaleza histórica del tiempo moderno. Para ello, en primer lugar, contextualizaré esta discusión en el debate más amplio sobre los orígenes e implicaciones sociales y teóricas sobre el tiempo moderno que se ha establecido en la historiografía y la sociología histórica. Más adelante, abordaré los conceptos de complejización social y proceso de civilización a partir de las aportaciones de Postone y de su concepto de tiempo abstracto. Además, desarrollaré las implicaciones de las propuestas de Postone y Elias sobre las formas de dominación temporal y la subjetividad en las sociedades contemporáneas, así como sobre potenciales discusiones con los conceptos de presentismo y aceleración social.
Historical Aspects of the Food Crises: Causes and Solutions
Authors: Prosekov Alexander
Published: July 2023

The thesis considers the food crisis in Russia considering historical, socio-economic and political circumstances. The study aims at determining food crises causes and identifying its compensation ways. Therefore, a man solved the following tasks consistently: studying the food crises content throughout all stages of the Russian agrarian development; determining the main food crisis causes at each stage; identifying the main ways to solve the food crisis. The study objects are articles, reports, notes with messages about the food crisis and the fight against hunger, statistical and economic information about agriculture in Russia. The researchers considered historical experience of food difficulties caused by natural or social factors, including statistical data on corn failures for 1891, 1906 and 1911 in the European part of Russia; the reduction dynamics of the grain cropped land and the productive cattle number in the RSFSR in 1913–1928; the share of the USSR agricultural territory occupied in 1941–1944; the dynamics of the USSR agricultural machinery fleet in 1940–1945; the dynamics of agricultural machinery and mineral fertilizers supplies for the USSR agriculture in 1940–1945. The paper concerns ways of solving food crisis, including technologies application that increase food production, such as biotechnology, genetic engineering, as well as the equal food distribution and public pressure to promote sovereign food programs, food production increase technologies.
Innovative Technology Complexity Assessment of the Russian Agro-Industrial Complex
Authors: Panfilov Victor
Published: July 2023

The article concerns some aspects of technologies development for the future agro-industrial complex. The focus is on the systems complexity concept. The range of issues discussed are the following: analysis and synthesis tasks of technological systems; the technological system behavior in conditions of interaction with the external environment; the characteristic features of a complex technological system – integrity, openness, nonlinearity, hierarchy, structure degree, emergence, dynamism, instability, adaptability; the quantitative structure complexity assessment of elements depending on the composition (type, number); the quantitative structure complexity assessment of communications depending on the composition (type, number); the quantitative technology complexity assessment as a whole; the technological system complexity assessment study through the complexity categories of equipment maintenance implementing this technology; the equipment maintenance complexity category as a processes complexity measure in the technological flow; the features of complex technologies development with a quantitative assessment of their complexity level; the analysis of complex technological system as synergetics object. A man paid special attention to the dialectic of agricultural technologies, which complication was a natural historical process.
Complex Supplement Development for the Gastroenterological Diseases Prevention
Authors: Evdokimova Oksana , Evdokimov Nikita , Ivanova Tamara , Pyanikova Elvira
Published: July 2023

The thesis concerns the primary gastroenterological incidence analysis in certain districts of the Kursk region and the identification of areas with a steady level decrease in primary morbidity. A man ranked the subjects of the Russian Federation on the incidence of acute intestinal infections of unknown etiology. According to the Aleksandr A. Spasov classification, the authors identified nine groups of biologically active additives supporting the digestive organs function; studied ingredients reducing the risk of gastrointestinal inflammatory and ulcerative processes; scrutinized the general chemical composition of plant ingredients of gastroenterological action. Roots of ginseng and calamus contain a significant amount of digestible carbohydrates (39.8 and 34.1 %, respectively). Spirulina and calamus root have an increased content of minerals, including antioxidants such as zinc, magnesium, selenium, copper (7.1 and 5.9 %, respectively). The paper presents the study results of the vitamin composition and the macro- and microelements content in plant ingredients, as well as ginseng root ginsenosides aged four, five and six years. A man developed three specialized food additive compositions based on the chemical medicinal plant composition analysis and justification of active substances for gastroenterological purposes, that included from 5 to 10 % ginseng root, from 60 to 65 % flax seeds, from 3 to 5 % calamus root, from 22 to 27 % spirulina. Against nutritiology, the food products enrichment with the developed additive will contribute to the gastroenterological disease prevention.
Analisis Citraan Dalam Puisi ‘Perempuan Yang Tergusur’ Karya W.S. Rendra
Authors: Adam Permana Mochammad Dimas , Haerussaleh Haerussaleh , Huda Nuril
Published: July 2023

This research focuses on imagery in the poetry collection “Perempuan Yang Tergusur” by W.S. Rendra. While the aim of this research is to describe the various types of imagery in the collection of poems “Perempuan Yang Tergusur” by W.S. Rendra. The method used is descriptive qualitative method. While the type of research used is library research. The research data focused on written data regarding the imagery aspect contained in the collection of poems “Perempuan Yang Tergusur” by W.S. Rendra. For data collection, the techniques used are reading techniques and note-taking techniques. The results of the analysis of the poetry of Perempuan Yang Digusur found 5 (five) forms of imagery, namely: (1) visual imagery; (2) auditory imagery; (3) olfactory imagery; (4) tactile imagery, and; (5) motion image. The imagery in the poem "“Perempuan Yang Tergusur” is described by the character "you", namely "evicted women" which is a representation of reality that occurs in marginalized communities who live in various big cities with various kinds of suffering and various injustices that they experience
Teknik Budidaya Tanaman Nanas (Ananas comosus (L.) Merr.) di Japan Agricultural (JA) Okinawa
Authors: Azomah Laelatul , Bambang Budi Santoso  , Uyek Malik Yakop
Published: July 2023

Sebagai negara tropis, Indonesia sangat berpotensi untuk pengembangan buah nanas. Jika dibudidayakan dengan baik, akan memberikan keuntungan yang cukup besar. Harga jual nanas saat ini di masyarakat tergolong sangat murah sebanding dengan kualitasnya yang kurang bagus akibat teknik budidaya yang kurang optimal. Berbeda dengan yang didapatkan di daerah Okinawa Jepang, teknik budidaya nanas sudah intensif sehingga kualitas hasilnya lebih tinggi. Tulisan ini bertujuan untuk memberikan informasi dan pembelajaran mengenai teknik budidaya nanas yang dilakukan di JA Okinawa (Japan Agricultural Cooperatives Okinawa) Prefektur Okinawa, Jepang. Metode yang digunakan yaitu deskripsi kualitatif. Teknik pengumpulan data berupa observasi, dokumentasi dan data-data dari lembaga koperasi yang terkait. Analisis data berupa analisis deskripsi kejadian. Hasil pengamatan menunjukkan bahwa teknik budidaya nanas yang dilakukan di JA Okinawa dapat dikatakan sudah termasuk teknik budidaya yang maju, mulai dari pembibitan hingga penanganan pascapanen telah menggunakan peralatan modern dengan penanganan yang teliti dan intensif. Selain itu, produk olahan nanas JA Okinawa telah memenuhi standar JAS (Japanese Agricultural Standard).
Peer Tutoring Pada Pembelajaran Qiraah di Program Bimbingan Belajar Lisan Arab PBA UPI
Authors: Roshua Astifa M. Iqbal , Syihabuddin Syihabuddin , Tantowi Yusuf Ali
Published: July 2023

Salah satu program yang dapat mengurangi diferensiasi kemampuan mahasiswa yang berbeda latar belakang pendidikan ialah program bimbingan belajar mahasiswa, diantaranya ialah Lisan Arab PBA UPI.Pada program ini, salah satu kemampuan kemahiran berbahasa yang memiliki mata pelajaran khusus ialah kemahiran membaca (qiraah). Penelitian ini bertujuan untuk mengGambarkan dan mendeskripsikan mengenai penerapan metode dan komponen pada pembelajaran qiraah di Lisan Arab. Fokus penelitian ini ialah pada metode yang digunakan dalam pembelajaran qiraah di program Lisan Arab serta komponen pendukung lainnya. Komponen yang dimaksud berupa tujuan pembelajaran, materi, bahan ajar, evaluasi, peserta didik dan pendidik. Metode yang digunakan dalam penelitian ini ialah metode analisis deskriptif dengan pendekatan kualitatif. Pengumpulan data dilakukan dalam tiga teknik, yaitu wawancara, angket dan dokumentasi. Analisis data yang digunakan ialah teknik Miles dan Huberman, yaitu reduksi data, display data dan penarikan kesimpulan. Objek dalam penelitian ialah komponen pembelajaran qiraah di Lisan Arab PBA UPI. Sedangkan subjeknya ialah penanggung jawab program, pendidik dan 19 orang peserta didik pada semester genap TA 2022/2023. Hasil dari penelitian ini berkaitan dengan metode. Metode yang digunakan pada pembelajaran qiraah di Lisan Arab ialah metode peer tutoring (tutor sebaya). Penggunaan metode ini dipadukan dengan pendekatan bimbingan, sehingga pendidik selain menjadi pengajar juga menjadi tutor bagi peserta didik. Metode ini menjadikan komunikasi dalam proses bimbingan menjadi lebih intens antara pendidik dan peserta didik. Suasana pembelajaran lebih cair, sehingga tidak ada lagi rasa malu dan canggung untuk bertanya Serta dengan adanya komponen pembelajaran yang telah dipersiapkan, menjadikan pembelajaran lebih terorganisir dan terarah. Kesimpulan dari penelitian ini ialah metode tutor sebaya pada pembelajaran qiraah di Lisan Arab memberikan dampak yang baik. Hal itu terGambar dari peningkatan nilai qiraah siswa dalam perkuliahan. Serta dari data yang dikumpulkan bahwa dengan menerapakan metode tutor sebaya, peserta didik lebih menyukai pembelajaran qiraah dibandingkan pembelajaran kemahiran berbahasa lainnya.
Saving Ukrainian Cultural Heritage Online and the Mission to Preserve Digital Cultural Heritage
Authors: Jolicoeur Kiley
Published: July 2023

The purpose of this paper is to provide a brief and preliminary examination of lessons learned by Saving Ukrainian Cultural Heritage Online (SUCHO) in its efforts to web-scrape Ukrainian cultural heritage websites and develop educational materials, following a grounding of the work in an equally brief foundation of the importance of Ukraine’s cultural heritage.
Pengaruh Perputaran Aset dan Likuiditas terhadap Profitabilitas
Authors: Tia Saptianti Agustina  , Helliana
Published: July 2023

Abstrak. Profitabilitas merupakan suatu proses untuk melihat seberapa besar investasi yang telah ditanamkan yang mana memberi keuntungan sesuai dengan yang diinginkan. Investasi tersebut sesungguhnya sama dengan aset perusahaan yang ditanamkan atau ditempatkan, kemuadian di kenal dengan ROA yang dapat dipengaruhi oleh elemen-elemen seperti perputaran aset, likuiditas, perpuratan persedian dan lain-lain. Penelitian ini bertujuan untuk mengetahui pengaruh total assets turn over terhadap profitabilitas serta untuk mengetahui pengaruh current ratio terhadap profitabilitas. Penelitian ini dilakukan pada sektor makanan dan minuman yang terdaftar di BEI tahun 2019 – 2021. Metode penelitian yang digunakan dalam penelitian ini adalah metode Verifikatif Deskriptif dengan pendekatan kuantitatif  dengan menggunakan metode analisis yang digunakan adalah regresi linear berganda, uji F dan uji t. Hasil analisis dari penelitian ini adalah total assets turn over dan current ratio berpengaruh secara simultan terhadap profitabilitas. Sedangkan analisis secara parsial menunjukkan hanya current ratio, yang berpengaruh terhadap profitabilitas sedangkan untuk  total assets turn over tidak berpengaruh signifikan terhadap profitabilitas.

 

Abstract. Profitability is a process to see how much investment has been invested which gives the desired profit. This investment is actually the same as the company's assets invested or placed, then known as ROA which can be influenced by elements such as asset turnover, liquidity, inventory balance and others. This study aims to determine the effect of total assets turnover on profitability and to determine the effect of the current ratio on profitability. This research was conducted in the food and beverage sector listed on the IDX in 2019 – 2021. The research method used in this research is the Descriptive Verification method with a quantitative approach using the analytical method used is multiple linear regression, F test and t test. The results of the analysis of this study are total assets turnover and current ratio simultaneously affect profitability. While the partial analysis shows that only the current ratio has an effect on profitability, while total assets turnover does not have a significant effect on profitability.
Pengaruh Penerapan Total Quality Management dan Motivasi Kerja terhadap Kinerja Manajerial
Authors: Mochammad Shalfa Mughni  , Epi Fitriah
Published: July 2023

Abstrak. Persaingan dalam dunia usaha terus mengalami perkembangan, sehingga pemanfaatan mutu dan sumber daya harus diperhatikan oleh perusahaan, karena sangat penting bagi perkembangan perusahaan tersebut. Perusahaan harus berusaha meningkatkan kinerja terbaiknya. Oleh karena itu perusahaan harus memiliki strategi agar dapat bertahan dalam persaingan jangka panjang, hal ini tidak lepas dari kinerja manajerial. Peningkatan kinerja manajerial salah satunya disebabkan oleh total quality management dan motivasi kerja. Hal tersebut memberikan mekanisme penting bagi perusahaan dalam memperbaiki rangka peningkatan kinerja dan tujuan perusahaan yang telah ditetapkan. Tujuan penelitian ini adalah untuk mengetahui pengaruh penerapan total quality management dan motivasi kerja terhadap kinerja manajerial pada PT X di Jawa Barat. Metode penelitian yang digunakan penelitian ini adalah metode pendekatan kuantitatif. Sumber data yang digunakan merupakan data primer. Selain itu dalam pengambilan sampel menggunakan non probability sampling dan teknik convenience sampling. Hasil penelitian ini menyatakan bahwa Penerapan Total Quality Management berpengaruh terhadap Kinerja Manajerial dan Motivasi Kerja tidak berpengaruh pada Kinerja Manajerial.

 

Abstract. Competition in the business world continues to experience development so the utilization of quality and resources must be considered by the company because it is very important for the development of the company. The company must try to improve its best performance. Therefore companies must have a strategy to survive in long-term competition, this cannot be separated from managerial performance. One of the reasons for improving managerial performance is total quality management and work motivation. This provides an important mechanism for the company to improve the performance improvement framework and company goals that have been set. The purpose of this study was to determine the effect of implementing total quality management and work motivation on managerial performance at PT X in West Java. The research method used in this research is a quantitative approach method. The source of data used is primary data. In addition, in taking samples using non-probability sampling and convenience sampling techniques. The results of this study state that the implementation of Total Quality Management has an effect on Managerial Performance and Work Motivation has no effect on Managerial Performance.
Model SEIR Penyebaran Covid-19 dengan Parameter Penggunaan Masker Kesehatan dan Vaksinasi
Authors: Afia Shahnaz , Ramdani Yani
Published: July 2023

Abstract. In Mathematics, research on the spread of a disease can be carried out by establishing an epidemiological model. One type of epidemiological model is the SEIR model. In this study, the SEIR model was developed to determine the effect of mask wearing and vaccination on the spread of Covid-19. The entire population was divided into six compartments, mask wearing and non mask wearing susceptible compartments, exposed compartment, mask wearing and non mask wearing infected compartments, and recovered compartment. The model for the spread of Covid-19 was formed by compiling a compartment diagram for the spread of Covid-19 disease with the parameters of mask wearing and vaccination first. Then, disease-free equilibrium point, endemic equilibrium point, and Basic Reproduction Number are determined. After that, numerical simulation was carried out. The results of this study indicate that the disease-free equilibrium point is locally asymptotically stable when the Basic Reproduction Number is less than one. Meanwhile, the endemic equilibrium point is locally asymptotically stable when the Basic Reproduction Number is larger than one. In addition, this study also shows that mask wearing and vaccinations reduce the value of  Basic Reproduction Number.

Abstrak. Dalam bidang Matematika, penelitian mengenai penyebaran penyakit dapat dilakukan dengan membentuk model epidemiologi. Salah satu jenis model epidemiologi adalah model SEIR. Pada penelitian ini, model SEIR dikembangkan untuk mengetahui pengaruh penggunaan masker kesehatan dan vaksinasi terhadap penyebaran penyakit Covid-19. Keseluruhan populasi dibagi menjadi enam kompartemen, yaitu kompartemen rentan yang tidak menggunakan masker kesehatan, kompartemen rentan yang menggunakan masker kesehatan, kompartemen terpapar, kompartemen terinfeksi yang tidak menggunakan masker kesehatan, kompartemen terinfeksi yang menggunakan masker kesehatan, dan kompartemen sembuh. Model penyebaran Covid-19 dibentuk dengan menyusun diagram kompartemen penyebaran penyakit Covid-19 dengan parameter penggunaan masker kesehatan dan vaksinasi terlebih dahulu. Setelah model Matematika terbentuk, dilakukan penentuan titik ekuilibrium bebas penyakit, titik ekuilibrium endemik, dan Basic Reproduction Number. Kemudian, dilakukan simulasi numerik. Hasil dari penelitian ini menunjukkan bahwa titik ekuilibrium bebas penyakit bersifat stabil asimtotik lokal saat nilai basic reproduction kurang dari satu. Sementara itu, titik ekuilibrium endemik bersifat stabil asimtotik lokal saat nilai Basic Reproduction Number lebih dari satu. Selain itu, penelitian ini juga menunjukkan bahwa penggunaan masker kesehatan dan vaksinasi berperan dalam penurunan nilai Basic Reproduction Number.
Implementasi Metode Topsis dalam Seleksi Penerimaan Dana Bantuan Masyarakat
Authors: Salsabila Hilwa Gifty , Suhaedi Didi
Published: July 2023

Abstract. One of the economic conditions in society is poverty. Poverty is the inability of a person to meet his basic needs, namely clothing, food and shelter. Therefore, the government's role is needed to help people who are lacking so they can live their lives. The only assistance provided by the government is the Assistance Fund for the underprivileged. In practice, the distribution of aid funds in the community is not always on target. This also happened in one of the villages, namely Sindang village. The aim of the research is to assist in the selection stage of receiving aid funds with the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) method. The TOPSIS method is one of the methods in a decision support system. The use of the TOPSIS method is to obtain more objective and precise results. The calculation of the TOPSIS method at the stage of selecting grant recipients was carried out using Microsoft Excel software. The results obtained are in the form of a list of recipients of aid funds based on preference values. The order is based on the highest preference value. The top sequence is people who are entitled to receive aid funds, while those at the bottom do not or are less eligible to receive aid funds.

Abstrak. Salah satu kondisi perekonomian di masyarakat adalah kemiskinan. Kemiskinan merupakan ketidakmampuan seseorang dalam memenuhi kebutuhan dasarnya, yaitu sandang, pangan, dan papan. Oleh karena itu, dibutuhkan peran pemerintah untuk membantu warga yang kekurangan agar dapat melangsungkan kehidupannya. Bantuan yang diberikan pemerintah salah-satunya adalah Dana Bantuan untuk masyarakat yang kurang mampu. Pada praktiknya penyaluran dana bantuan di masyarakat tidak selalu tepatan sasaran. Hal tersebut juga terjadi di salah satu desa, yaitu desa Sindang. Tujuan penelitian ialah membantu tahapan seleksi penerimaan dana bantuan dengan metode Technique for Order Preference by Similarity to Ideal Solution (TOPSIS). Metode TOPSIS merupakan salah satu metode dalam sistem pendukung keputusan. Digunakannya metode TOPSIS ialah untuk mendapatkan hasil yang lebih objektif dan tepat. Perhitungan metode TOPSIS pada tahapan seleksi penerima dana bantuan dilakukan menggunakan software Microsoft Excel. Diperoleh hasil berupa urutan daftar penerima dana bantuan berdasarkan nilai preferensi. Urutan didasarkan pada nilai preferensi tertinggi. Urutan teratas adalah masyarakat yang berhak menerima dana bantuan, sedangkan yang paling bawah tidak atau kurang layak menerima dana bantuan.
Fungsi Transposisi Modulo untuk Mencari Nada pada Komposisi Akor dalam Musik Blues
Authors: Pratama Fakhri Murfid , Sukarsih Icih
Published: July 2023

Abstract. Many people were not aware that mathematics is often used to solve problems in their daily life. It can solve various problem which may connected to one's hobby, such as  music. Many did not realize that music is related to mathematics. One of the music theory that is closely related to mathematics is the use of numerical notation. One of the important aspect of music theory is chords, which is a group if notes that produce harmonious sound when played simultaneously. There are many variations of chords, especially in blues songs. To determine the composition of the chord itself, the major scale of the chord was used, and the scales of the 12 existing notes transformed into integer using Integer Model of Pitch. In this research, the modulo transposition function was used to find a scale with 12 different basic tones. Modulo arithmetic was also used in this study to transpose several notes in chord compositions. The scales that have been transposed then was used to translate chord compositions in blues songs.

Abstrak.Pada kehidupan sehari – hari banyak yang tidak sadar bahwa ilmu matematika sering digunakan untuk menyelesaikan masalah. Salah satu penyelesaian masalah tersebut adalah penyelasaian terhadap hobi yang sering dijumpai di masyarakat umum yaitu bermusik. Banyak yang tidak menduga bahwa musik berhubungan dengan matematika. Salah satu ilmu bermusik yang berkaitan erat dengan matematika adalah penggunaan notasi angka. Selain notasi angka adapun akor yang merupakan dari nada – nada yang apabila dimainkan secara bersamaan akan menghasilkan suara yang harmonis. Akor sendiri memiliki banyak variasi sehingga komposisi di dalam akor bisa dikatakan sangat bervariasi terutama dalam lagu beraliran blues. Musik beraliran blues menggunakan akor yang bervariasi dalam satu lagunya. Untuk menentukan komposisi akor sendiri digunakan tangga nada mayor dari nama akor tersbut sehingga harus dicari semua tangga nada dari 12 nada yang ada. Dalam penelitian ini fungsi transposisi modulo digunakan untuk mencari tangga nada dengan 12 nada dasar yang berbeda dengan menggunkan Integer Model of pitch. Aritmetika modulo pun digunakan dalam penelitian ini untuk mentrasposisi beberapa nada yang ada komposisi akor. Tangga nada sudah ditransposisi selanjutnya digunakan untuk menerjemahkan komposisi akor dalam lagu blues yang akan dijadikan sebagai objek penelitian.
Pengaruh Pet Attachment terhadap Tingkat Stres pada Pemilik Hewan Peliharaan Kucing di Kota Bandung
Authors: Citra Lalitya Optiarni  , Farida Coralia
Published: July 2023

Abstract. Stress can be experienced by anyone and occurs in everyday life, stress emphasizes experiences that occur when individuals perceive or evaluate the experience as a threat or potential danger and the resources they have are inadequate to overcome it. Individuals will look for ways or use the resources they have in an effort to reduce stress, one of which is keeping a pet or bonding with pets. Pet attachment or the attachment that pet owners have with their pets is how someone has an emotional connection with their pets based on the interactions they make, and pet owners get a sense of comfort and even psychological support. The purpose of this study was to see whether there was an effect of pet attachment on the stress level of cat pet owners in the city of Bandung. Respondents in this study amounted to 243 respondents and the data analysis used was simple linear regression analysis. The pet attachment variable was measured using the Lexington Attachment to Pets Scale (LAPS) and stress levels were measured using the Perceived Stress Scale (PSS). The results of this study are found that pet attachment contributes to stress levels, when the pet attachment is strong, the stress level can decrease. The contribution of the pet attachment variable to the stress level is 6.4% and the regression coefficient value is -0.145.

Abstrak. Stres dapat dialami oleh siapapun dan terjadi dalam kehidupan sehari-hari, stres menekankan pada pengalaman yang terjadi ketika individu mempersepsikan atau mengevaluasi pengalaman tersebut sebagai suatu ancaman atau potensi bahaya dan sumber daya yang dimiliki tidak memadai untuk mengatasinya. Individu akan mencari cara atau menggunakan sumber daya yang dimiliki sebagai upaya untuk mengurangi stres, salah satu upaya nya yaitu memelihara hewan peliharaan atau keterikatan dengan hewan peliharaan. Pet attachment atau keterikatan yang dimiliki pemilik hewan peliharaan dengan hewan peliharaannya yaitu bagaimana seseorang memiliki hubungan emosional dengan hewan peliharaannya berdasarkan interaksi yang dilakukan, serta pemilik hewan peliharaan mendapatkan rasa kenyamanan dan bahkan dukungan psikologis. Tujuan dari penelitian ini adalah untuk melihat apakah terdapat pengaruh pet attachment terhadap tingkat stres yang dimiliki pemilik hewan peliharaan kucing di kota Bandung. Responden pada penelitian ini berjumlah 243 responden dan analisis data yang digunakan adalah analisis regresi linear sederhana. Variabel pet attachment diukur dengan menggunakan alat ukur Lexington Attachment to Pets Scale (LAPS) dan tingkat stres diukur dengan menggunakan alat ukur Perceived Stress Scale (PSS). Hasil dari penelitian ini yaitu ditemukan bahwa pet attachment memberikan kontribusi terhadap tingkat stres, ketika pet attachment kuat maka tingkat stres yang dimiliki dapat menurun. Besarnya kontribusi variabel pet attachment terhadap tingkat stres adalah sebesar 6,4% dan nilai koefisien regresi sebesar -0,145.