bluuebunny/crossref_metadata_2025 huggingface dataset:
Accounting Information and Stock Price of Consumer Good Companies Listed in Vietnam Stock Market in COVID Time
Authors: Thanh Quy Tran Thi , Van Tan Mai , Viet Cuong Pham , Thao Nguyen Nguyen Thi , Hoai Nam Nguyen , Doan Trang Le Ngoc
Published: July 2023

Purpose: The study's objective is to find more empirical evidence on the relationship between accounting information on financial statements and stock prices of consumer good companies listed on the Vietnamese stock market in Covid time.
 
Theoretical framework: Follow efficient market theory, in an efficient market, the actual price will immediately reflect new information about the intrinsic value of the firm, based on the idea that stock market prices will reflect public information available on the market (including financial information of enterprises).
 
Design/Methodology/Approach: The sampling method was used to from 2019 to 2021 (the period when the Vietnamese and world economies were severely affected by the Covid-19 epidemic) through the analysis of OLS, FEM, REM, and GLS models and Stata17 software.
 
Findings: The results show that DPS and EPS are two of the factors that have the most positive influence on stock prices during this period, while ROE is an indicator that harms companies' stock prices.
 
Research, practical & social implications: Therefore, future studies regarding sample size and research space can be more extensive. In addition, it is possible to measure accounting information and stock prices by other statistical methods or other indicators to improve further the theoretical framework in the relationship between accounting information and stock price.
 
Originality/Value: Thereby helping investors, businesses, and policymakers better understand the accounting information's role in the capital market, offering appropriate business and regulatory solutions to improve market efficiency.
The Significance of Clothing in Figure Sculptures
Authors: Li Wenhao
Published: July 2023

Changes in clothing styles symbolize the continuation of history because clothes are a basic human necessity. The role of clothing has evolved over time from its primary purpose of providing warmth and modesty, to being a way to express one’s identity, profession, tradition and aesthetic. The development and formation of clothing styles are influenced by regional, historical and cultural factors, as well as deep-rooted ethnic characteristics. When artists explore the incorporation of clothing styles in sculpture creation, they illuminate the inherent values, forms, connotations, and aesthetic qualities of clothing from different ethnic groups and historical periods. Therefore, the study of clothing in figure sculptures is a fundamental discipline in the research and process of sculpture creation. It is also a unique and specialized training method of modern sculpture, serving as a significant aspect of the basic training for modern sculpture creation.
Pupilometri Dinamis untuk Mengukur Respons Pupil sebagai Pendeteksi Dini Demensia pada Lansia
Authors: WAHYUDI CELINE GABRIELLA , LUKAS LUKAS , BUDIYANTA NOVA EKA
Published: July 2023

ABSTRAKPupilometri merupakan metode pengukuran respons pupil terhadap stimulus. Kemampuan pupil mata dalam merespons cahaya diamati melalui pupillary light response (PLR). Penelitian mendapati PLR pasien demensia berbeda dengan pasien normal. Penelitian ini bertujuan merancang algoritma computer vision yang dapat mendeteksi pupil secara akurat, menampilkan respons pupil terhadap cahaya dalam bentuk grafik dan PLR pada sebuah aplikasi desktop, yang mengendalikan goggles berisi rangkaian kamera, pencahayaan, dan sensor jarak VL53L0X. Rekaman diproses dengan Local Binary Pattern (LBP) dan deteksi kontur untuk mendeteksi pupil. Data pengukuran diproses dan disimpan pada basis data lokal dan aplikasi web, sehingga tenaga medis dapat menentukan ada atau tidaknya gejala demensia pada pasien lansia. Tingkat ketelitian algoritma pengukuran pupil sebesar 73,33% yang didapatkan dari 30 kali pengujian.Kata kunci: computer vision, demensia, deteksi dini, pupillary light response, pupilometri ABSTRACTPupillometry is a method of measuring the pupil’s response towards stimulus. Pupil response to light is observed through pupillary light response (PLR). Research found that PLR values of patients suffering from dementia differ from that of normal patients. This study implements a computer vision algorithm that accurately detects the pupil, calculates, and shows its response towards light in graphs and PLR values on a desktop application which controls goggles that contain a camera, lighting setup, and the VL53L0X distance sensor. Video is processed using Local Binary Pattern (LBP) and contour detection to detect the pupil. Results are processed and saved in the local and web database, so experts can determine the presence of dementia symptoms in the elderly patient. The accuracy of the pupil detection algorithm is 73,33%, as obtained from 30 tests.Keywords: computer vision, dementia, early detection, pupillary light response, pupillometry
Clustering Suara Corona Discharge berdasarkan Tegangan menggunakan Metode Fuzzy C-Mean
Authors: FIKRI MIFTAHUL , CHRISTIONO CHRISTIONO , MULYANA K. IWA GARNIWA , MAURIRAYA KARTIKA TRESYA , PASRA NURMIATI , SAMSURIZAL SAMSURIZAL , ROMADHONI MUHAMMAD LUTHFIANSYAH , THAHARA ANDI AMAR
Published: July 2023

ABSTRAKCorona discharge (CD) atau peluahan permukaan merupakan faktor kegagalan isolasi pada sistem kelistrikan yang dipengaruhi oleh kondisi lingkungan tidak menentu dan perlu pemantauan secara terkini. CD menghasilkan gelombang suara yang digunakan sebagai parameter untuk langkah awal mencapai tujuan tersebut, penelitian ini mengkluster suara CD pada terminasi kubikel 20 kV. Penelitian menggunakan elektroda jarum-jarum berjarak 3 cm. Tercatat nilai sebelum breakdown voltage terjadi pada tegangan 33,4 kV, dan pengambilan data terbagi 3 klaster: 20-24 kV, 25-29 kV, 30-33 kV. Proses klasterisasi dengan metode LPC untuk menghasilkan ekstraksi suara. Kemudian menggunakan metode fuzzy c-mean untuk memperoleh akurasi dengan membandingkan pola suara training dan testing. Pada Kelembapan berkisar 70%-95% dengan suhu antara 27,5°C - 35.3°C diperoleh hasil akurasi 96,00% untuk data training dan 80,00% untuk data testing.Kata kunci: Corona discharge, fuzzy c-mean, linear predictive coding, kegagalan isolasi ABSTRACTCorona discharge (CD) is a factor in insulation failure in electrical systems, which is affected by uncertain environmental conditions and requires up-to-date monitoring. CD which produces sound waves, is used as a parameter for the initial step to achieve this goal. This research will cluster CD sounds at 20 kV cubicle terminations. The study used electrode needles spaced 3 cm apart. The value recorded before the breakdown voltage occurred was 33.4 kV, and data collection was divided into 3 clusters: 20–24 kV, 25–29 kV, and 30-33 kV. The clustering process with the LPC method produces sound extraction. Then use the fuzzy C-mean method to obtain accuracy by comparing trained and tested sound patterns. At a humidity range of 70%–95% and temperatures between 27.5°C–35.3°C, the results obtained an accuracy of 96.00% for training data and 80.00% for testing data.Keywords: Corona discharge, fuzzy c-mean, linier predictive coding, insulation failure
Analisis Arsitektur Jaringan Syaraf Tiruan-Multilayer Perceptron untuk Efektivitas Estimasi Beban Energi Listrik PT. PLN (Persero) UP3 Salatiga
Authors: SAPUTRA RONI , SUNARDIYO SAID , NUGROHO ANAN , SUBIYANTO SUBIYANTO
Published: July 2023

ABSTRAKPT PLN (Persero) UP3 Salatiga merupakan perusahaan penyedia energi listrik enam kabupaten di Jawa Tengah. Agar energi listrik yang mengalir ke pelanggan handal dan ekonomis, penyesuaian antara supply dan demand penting untuk dilakukan. Hal ini bisa dilakukan dengan perencanaan operasi sistem tenaga listrik dalam bentuk estimasi beban energi listrik. Pada penelitian ini, estimasi dilakukan dengan jaringan syaraf tiruan-multilayer perceptron. Sejumlah variasi jumlah layer dan node pada arsitektur perceptron diuji-cobakan untuk mendapatkan performa estimasi yang terbaik. Dari penelitian ini, diperoleh arsitektur terbaik yaitu TRAINGDA 4 hidden layer dengan 20 node hidden layer, dengan nilai MAPE sebesar 2.79% tahap training, serta nilai MAPE sebesar 3.24% tahap testing. Hasil ini mengindikasikan bahwa metode jaringan syaraf tiruan-multilayer perceptron lebih akurat sebagai estimator beban energi listrik PT PLN (Persero) UP3 Salatiga.Kata kunci: estimasi, estimasi beban, energi listrik, multilayer perceptron ABSTRACTPT PLN (Persero) UP3 Salatiga is an electricity provider company for 6 districts in Central Java. To ensure reliable and economical electricity supply to customers, adjustment between supply and demand is important to be conducted. This can be achieved through planning of power system operation in the form of electricity load estimation. In this study, estimation was performed using artificial neural network-multilayer perceptron. Several variations of the number of layers and nodes in the perceptron architecture were tested to obtain the best estimation performance. From this study, the best architecture was obtained with TRAINGDA 4 hidden layers and 20 hidden layer nodes, resulting in MAPE value of 2.79% in the training phase and 3.24% in the testing phase. These results indicate that artificial neural network-multilayer perceptron method is more accurate as an estimator of electricity load for PT PLN (Persero) UP3 Salatiga.Keywords: estimation, load estimation, electrical energy, multilayer perceptron
Klasifikasi Warna pada Kematangan Buah Kopi Kuning menggunakan Metode CNN Inception V3
Authors: UNGKAWA UUNG , HAKIM GALIH AL
Published: July 2023

ABSTRAKKopi kuning adalah varietas kopi yang berciri khas berwarna kuning saat matang. Permasalahan muncul saat petani tidak sengaja memanen kopi yang masih belum matang sempurna karena warna kopi kuning yang matang berbeda dari kopi lainnya. Penelitian ini menggunakan metode CNN Inception V3 yang merupakan metode deep learning untuk menentukan kematangan buah kopi kuning. Ada permasalahan yakni kurangnya dataset. Dengan teknik augmentasi dan transfer learning permasalahan tersebut dapat diatasi dengan memperoleh model yang baik. Dengan menggunakan label yaitu mentah, setengah matang, matang, dan total 1380 dataset citra buah kopi yang dipecah menjadi 984 citra untuk training, 246 citra untuk validasi dan 150 citra buah kopi untuk testing, didapatkan nilai akurasi metode CNN Inception V3 sebesar 92.00%.Kata kunci: Kopi Kuning, CNN Inception V3 ABSTRACTYellow coffee is a variety of coffee that is distinctive, which has a yellow color when ripe. Problems arise when farmers accidentally harvest coffee that is not fully ripe yet because the color of ripe yellow coffee is different from other coffees. This study used the CNN Inception V3 method, which is a deep learning method for determining the ripeness of yellow coffee cherries. There is a problem, namely the lack of datasets. With augmentation techniques and transfer learning these problems can be overcome by obtaining a good model. By using three labels, namely raw, half-ripe, and ripe, and a total of 1380 coffee bean image datasets broken down into 984 images for training, 246 images for validation and 150 coffee bean images for testing, the accuracy value of the CNN Inception V3 method is 92.00%.Keywords: Yellow Coffee, CNN Inception V3
Pengendalian Arus pada Inverter Lima Tingkat Penaik dan Penurun Tegangan
Authors: PRATOMO LEONARDUS HERU , CHRISTIAWAN HAPPY DIPTYA EKA
Published: July 2023

ABSTRAKPenggunaan inverter terkendali arus pada sistem integrasi dengan jala-jala memiliki beberapa kendala seperti nilai tegangan masukan inverter harus melebihi tegangan pada jala-jala, ditambah lagi terdapat gangguan harmonisa pada frekuensi pensaklaran inverter yang dapat menginterferensi jala-jala. Penggunaan inverter lima tingkat yang digabung dengan AC-AC boost diajukan pada makalah ini untuk mengeliminasi gangguan harmonisa dan mampu menghasilkan nilai tegangan yang lebih tinggi dari pada nilai tegangan masukan. Dengan begitu konverter yang diajukan mampu bekerja sebagai penaik dan penurun tegangan. Konverter yang diajukan menggunakan satu buah sumber DC dan menerapkan metode arus keluaran yang terkendali sebagai dasar dalam penyuntikan arus ke jala-jala untuk riset ke depan. Konverter yang diajukan mampu menghasilkan nilai Total Harmonic Distortion (THD) sebesar 2,6% dan memenuhi standar IEEE Std 519-2014 yaitu kurang dari 5%.Kata kunci: inverter lima tingkat , kendali arus, penaik dan penurun tegangan, THD, penyuntikan arus ke jala-jala ABSTRACTThe use of grid connected current-controlled inverters has several constraints such as the input voltage value of the inverter must exceed the voltage on the grid, plus there are harmonic disturbances at the inverter switching frequency which can interfere with the grid. The use of a five-level inverter combined with AC-AC boost is proposed in this article to eliminate harmonic disturbances and be able to produce a higher voltage value than the input voltage value. Thus the proposed converter is able to work as a buck and boost voltage. The proposed converter uses a single DC source and applies a controlled output current method as a basis for injecting current into the grid for future research. The proposed converter is capable of producing a Total Harmonic Distortion (THD) value of 2.6% and meets the IEEE Std 519-2014 standard, which is less than 5%.Keywords: five-level inverter, current controlled, buck-boost inverter, THD, current injection
Studi Kelayakan Pembangkit Listrik Tenaga Hybrid Surya Bayu di Kota Bandung
Authors: HADIATNA FEBRIAN , FAUZIAH DINI , SYAHIRAH ELISA
Published: July 2023

ABSTRAKPada penelitian ini dilakukan analisis studi kelayakan potensi pembangkit listrik tenaga hybrid dengan sumber energi terbarukan surya dan bayu untuk skala rumah tangga di daerah kota Bandung. Beban yang digunakan sebesar 4896Wh setiap harinya. Analisis dilakukan dengan menggunakan aplikasi HOMER untuk menentukan nilai investasi dari PLTH yang dirancang serta produksi energi listrik yang dihasilkannya. Hasil dari penelitian ini adalah sistem pembangkit listrik hybrid mampu menghasilkan daya sebesar 2.313 kWh/tahun dengan perbandingan 48,7% dari sumber energi angin, 20,8% dari sumber energi surya, serta 9,7% sumber PLN. Nilai investasi dari sistem tersebut adalah Rp 32.910.770 untuk NPC, dengan IRR yang dihasilkan adalah 13%. Berdasarkan hasil analisis studi kelayakan tersebut, maka investasi yang digunakan pada sistem hybrid ini tidak rugi dan layak untuk direalisasikan.Kata kunci: PLTH, studi kelayakan, HOMER, surya, bayu. ABSTRACTIn this research, an analysis of the feasibility study of potential hybrid power plants with solar and wind renewable energy was carried out for household scale in Bandung city. The load used is 4896Wh every day. The analysis was carried out using the HOMER application to determine the investment value of the designed PLTH and the production of the electrical energy it produces. The result of this research is that the hybrid power generation system is capable of producing a power of 2313 kWh/year with a ratio of 48.7% from wind energy sources, 20.8% from solar energy sources, and 9.7% from PLN sources. The investment value of the system is IDR 32,910,770 for NPC, with the resulting IRR of 13%. Based on the results of the feasibility study analysis, the investment used in this hybrid system is lossless and feasible to realize.Keywords: hybrid power plant, feasibility study, HOMER, solar, wind.
MAIN WAYS OF DEVELOPING THE LANGUAGE PERSONALITY OF A CHILD WITH AUTISM SPECTRUM DISORDER
Authors: D.V. Dremin
Published: July 2023

The article provides a substantiation of the significance of the development of the linguistic personality of a child with an autism spectrum disorder. This article also puts forward the idea of creating a set of exercises aimed at the consistent development of the levels of the child's linguistic personality. We pay special attention to examples of exercises for psychological and correctional practice.
Consistent development of the three levels of the language personality of a child with ASD will effectively influence not only the formation of communication and social skills, but also cognitive development. A clear distinction between three levels (according to Yu. N. Karaulov): verbal-semantic, cognitive and motivational is rather arbitrary, since in practice all three levels related to each other. In this paper, we propose to revise the hierarchy of levels of linguistic personality, distributing them in reverse order: motivational, cognitive and verbal-semantic. It is in this order that we propose to carry out correctional work with children of preschool and primary school age who have an autism spectrum disorder. A prerequisite for working with this category of children is that they have adequately expressed verbal skills of both expressive and impressive speech. The article presents a set of tasks that allow influencing the cognitive and speech impairments in children with ASD through the formation of internal communicative motivation.
CREATING A TASK BOOK FOR THE COURSE "PHYSICAL CHEMISTRY OF NATURAL IUDS" IS ONE OF THE IMPORTANT ASPECTS OF IMPROVING THE LEARNING PROCESS AT A MEDICAL UNIVERSITY
Authors: N.V. Golovina , D.A Dobrokhotov , A.A. Filippova , N.Yu Garnova , O.V. Nesterova
Published: July 2023

In modern higher education, an important component of the educational process is the independent work of students. Independent work is one of the key elements of educational activity, with the help of which it is possible to judge the effectiveness of student learning. For more successful and high-quality independent work of students, good material and technical support, teaching aids and guidance from the teaching staff are required. [1]. In our article, we would like to talk about the independent work of students of Sechenov University, which can be improved and aimed at solving professionally oriented tasks through the use of a modern, designed for the needs of the formation of a unified natural science concept of the problem book. Control and measuring materials prepared by the team of authors are included in the problem book developed for students of 2-3-4 courses of different faculties (medical, pharmaceutical, pediatric, dental, bioengineering) in the course "Physical chemistry of natural IUDs". The materials of the problem book were compiled in the initial version for the Faculty of Bioengineering and Biotechnology, but in the process of creating a database, the authors came to the conclusion that the material presented in the problem book is of interest to all medical specialties, because, to one degree or another, it is studied by students all faculties of medical universities. The revised and supplemented problem book for the course "Physical Chemistry of Natural Naval Forces" will allow a deeper and more detailed study of educational material relevant to all medical specialties. Fundamental and in-depth knowledge of students in this course is not always, to the right extent, in demand at various faculties. This is probably due to the fact that the use of knowledge in this course in certain specialties is not clearly explained by teachers. The task book contains a brief theoretical material on the topics of the course "Physical Chemistry of Natural Compounds". Sections on topics contain: control questions, tests for self-study, examples of solving typical problems, tasks for self-solving; reference material is provided in the appendix.
CONCEPTUAL PICTURE OF THE WORLD AS A COGNITIVE COMPONENT OF THE LANGUAGE PERSONALITY OF A CHILD WITH AUTISM SPECTRUM DISORDER
Authors: D.V. Dremin
Published: July 2023

The article considers the possibility of expanding the methods of correcting the speech and cognitive skills of a child with autism spectrum disorder (ASD) by referring to the analysis of the conceptual picture of the world as a component of the child's linguistic personality. The basis of the conceptual picture of the world is a unique mental product associated with the peculiarities of the transformation and interpretation of information by an individual. This peculiarity of the conceptual picture of the world provides rich ground for research in the field of cultural linguistics, however, the application of the theory of the conceptual picture of the world can be no less effective in psychological and pedagogical practice, in particular, in working with children with autism spectrum disorder. The results of the study of the conceptual picture of the world are presented and a model of its development in children with ASD, who have the initial skills of expressive speech, is developed. The significance of an integrated approach to the development of the language personality of a child with ASD is substantiated, which implies a simultaneous impact on all language levels and cognitive activity of the child. Particular emphasis is placed on the sequence of correctional activities of a specialist in the context of the development of the linguistic personality of a child with ASD, taking into account the peculiarities of his conceptual picture of the world.
Potentiometric determination of captopril in pharmaceutical formulations
Authors: Ribeiro Paulo Roberto da Silva , Santini Alberto Oppermann , Pezza Helena Redigolo , Pezza Leonardo
Published: July 2023

A simple, precise, rapid and low-cost potentiometric method for captopril determination in pureform and in pharmaceutical preparations is proposed. Captopril present in tablets containing knownquantity of drug was potentiometrically titrated in aqueous solution with NaOH using a glass pH elec-trode, coupled to an autotitrator. No interferences were observed in the presence of common compo-nents of the tablets as lactose, microcrystalline cellulose, croscarmellose sodium, starch and magnesiumstearate. The analytical results obtained by applying the proposed method compared very favorably withthose obtained by the United States Pharmacopoeia Standard procedure. Recovery of captopril fromvarious tablet dosage formulations range from 98.0 to 102.0%.
Avaliação e caracterização da pastilha sensora de um eletrodo de segunda espécie sensível a oxalato
Authors: Villafranca Ana Cristina , De Moraes Mercedes , Pezza Leonardo
Published: July 2023

O eletrodo Pt|Hg|Hg 2 Ox|Grafite (Ox = íon oxalato) foi estudado utilizando NaClO 4 como eletrólitode suporte. Foram feitas experiências preliminares utilizando o NaNO 3 como eletrólito de suporte seguindoa mesma metodologia do trabalho anterior e verificou-se que havia uma diminuição na sensibilidade doeletrodo em função do tempo de uso. Visando compreender a diferença de comportamento do eletrodoem meio de NaClO 4 e NaNO 3 foram feitas experiências de obtenção de curvas de potencial em função dotempo para verificar seu comportamento em função do tempo e em diferentes meios iônicos. A morfologiada superfície da pastilha sensora usada em meio de NaNO 3 apresentou alteração, a qual sugere que estemeio favorece reações na superfície da pastilha sensora que fica em contato com a solução.
Dielectric spectroscopy and thermally stimulated discharge current in PEEK film
Authors: Sakamoto Walter Katsumi
Published: July 2023

The complex permittivity of films of polyether ether ketone (PEEK) has been investigatedover a wide range of frequency. There is no relaxation peak in the range of 1Hz to 10 5 Hz but in the low-frequency side (10 -4 Hz) there is an evidence of a peak that also can be observed by thermally stimulateddischarge current measurements. That peak is related with the glass transition temperature (T g ) of thepolymer. The activation energy of the relaxation was found to be 0.44 eV, similar to that of severalsynthetic polymers. Space charges are important in the conduction mechanism as shown by dischargingtransient.
Effect of alcohol concentration and electrode composition on the ethanol electrochemical oxidation
Authors: Bergamaski Kleber , Gomes Janaína Fernandes , Goi Beatriz Eleuterio , Nart Francisco Carlos
Published: July 2023

The electrochemical oxidation on platinum and platinum rhodium bimetallic electrodes wasstudied by Differential Electrochemical Mass Spectrometry for several ethanol concentrations in solution.It is found that increasing the ethanol concentration the production of the partially oxidized products(acetaldehyde) increases as the concentration increases. On the other hand, addition of 25% at. of rhodiumincreases the full oxidation to CO 2 . Another interesting result observed is a correlation between theintensity of the dehydrogenations peak at 0.3 V vs. RHE and the CO 2 yield for the different ethanolconcentration studied.
Determinação de parâmetros físico-químicos com um sensor potenciométrico sensível ao íon p-aminobenzoato
Authors: Santini Alberto Opperman , Da Silva Júnior Elias Severo , Pezza Helena Redigolo , Pezza Leonardo
Published: July 2023

Este trabalho descreve a construção e a determinação de parâmetros físico-químicos com umeletrodo de segunda ordem do tipo, Pt|Hg|Hg 2 (PAB) 2 |Grafite, sensível ao íon p-aminobenzoato (PAB). Oeletrodo é construído facilmente, apresenta um rápido tempo de resposta, é de baixo custo e tem umtempo de vida útil superior a 12 meses. Utilizando o referido eletrodo foi possível estimar os coeficientesde atividade iônica individuais do PAB, a 25 0 C, em força iônica ajustada entre 0,700-3,000 mol L -1 comNaClO 4 , em solução aquosa. O potencial molal padrão do eletrodo determinado a 25oC é de (445,5 ± 0,5)mV. A constante termodinâmica do produto de solubilidade, T K ps (I=0) do Hg 2 (PAB) 2 determinada com oeletrodo é de ( T K ps = 2,50 x 10 -12 mol 3 L -3 , a 25oC). Uma característica favorável consiste no fato de queo eletrodo pode ser utilizado para determinar a concentração de íons p-aminobenzoato livres em sistemascomplexos de íons metálicos.
Synthesis and thermal studies of solid state 2-chloro- benzylidenepyruvic acid and its compounds with sodium, aluminium (III), gallium (III) and indium (III) cations
Authors: Bannach Gilbert , Schnitzler Egon , Melios Cristo Bladimiros , Ionashiro Massao
Published: July 2023

The synthesis of sodium 2-chlorobenzylidenepyruvate and its corresponding acid as well asbinary, binary together with it’s acid or hydroxo-2-chorobenzylidenepyruvate of aluminium (III), gallium(III) and indium (III), were isolated. Chemical analysis, thermogravimetry, derivative thermogravimetry(TG/DTG), simultaneous thermogravimetry-differential thermal analysis (TG-DTA) and X-ray powderdiffractometry have been employed to characterize and to study the thermal behaviour of these compounds.The results provided information concerning the stoichiometry, crystallinity, thermal stability and thermaldecomposition.
Aplicação da zeólita natural escolecita na remoção de metais pesados de efluentes industriais: competição entre os cátions e processo de dessorção
Authors: Dal Bosco Sandra Maria , Jimenez Ricardo Sarti , Carvalho Wagner Alves
Published: July 2023

Efluentes aquosos industriais são a principal causa de contaminação das águas com metaispesados. Diante de uma legislação cada vez mais rígida para o descarte desses metais, o desenvolvimen-to de procedimentos eficientes e de baixo custo para o tratamento de efluentes contendo metais pesadostorna-se de grande interesse. Um estudo sobre a capacidade de retenção de metais pesados pela zeólitanatural escolecita foi realizado, de modo a se avaliar a viabilidade desta aplicação. Os cátions utilizadosforam Mn(II), Cd(II), Ni(II) e Cr(III). Nesta etapa do trabalho, foi avaliado o comportamento da zeólitana adsorção seletiva de cátions presentes nos pares Cd/Mn, Cr/Ni, Cr/Cd e Ni/Mn, bem como a possibi-lidade de dessorção dos cátions metálicos adsorvidos em sua estrutura. A escolecita apresentou umaseletividade que pode ser relacionada, na maioria dos casos, à valência e ao raio iônico das espécieshidratadas. Os cátions Cr(III) e Ni(II) foram fortemente adsorvidos, não podendo ser substancialmenteremovidos por troca com cátions sódio ou cálcio. Dos cátions testados, apenas o Cd(II) apresentoucomportamento de adsorção e de dessorção atípicos, demonstrando uma elevada labilidade no processode troca iônica.
Thermal behavior of alginic acid and its sodium salt
Authors: Soares João da Paixão , Dos Santos Jose Estrela , Chierice Gilberto Orivaldo , Cavalheiro Éder Tadeu Gomes
Published: July 2023

An evaluation of hydration and thermal decomposition of HAlg and its sodium salt isdescribed using thermogravimetry (TG) and differential scanning calorimetry (DSC). TG curves inN 2 and air, were obtained for alginic acid showed two decomposition steps attributed to loss of waterand polymer decomposition respectively. The sodium alginate decomposed in three steps. The firstattributed to water loss, followed by the formation of a carbonaceous residue and finally the Na 2 CO 3 .DSC curves presented peaks in agreement with the TG data. In the IR alginic acid presented bands at1730 and 1631 cm -1 , while sodium alginate presented a doublet at 1614 e 1431 cm -1 , evidencing thepresence of salified carboxyl groups.
The Li+, Na+ and K+ ion exchange reaction process on the surface of mixed oxide SiO2/TiO2/Sb2O5 surface prepared by the Sol-Gel processing method
Authors: Ferreira Cláudia Urbano , Gonçalves José Eduardo , Kholin Yuriy Valentinovych , Gushikem Yoshitaka
Published: July 2023

The porous mixed oxide SiO 2 /TiO 2 /Sb 2 O 5 obtained by the sol-gel processing method presenteda good ion exchange property and a high exchange capacity towards the Li + , Na + and K + ions. In the H + /M + ion exchange process, the H + / Na + could be described as presenting an ideal character. The ionexchange equilibria of Li + and K + were quantitatively described with the help of the model of fixedtetradentate centers. The results of simulation evidence that for the H + / Li + exchange the usual situationtakes place: the affinity of the material to the Li + ions is decreased with increasing the degree of ionexchange. On the contrary, for K + the effects of positive cooperativity, that facilitate the H + / K + exchange,were revealed.
Uso de reações de Fenton na remediação de solo contaminado com p,p’ DDT
Authors: Villa Ricardo Dalla , Nogueira Raquel Ferandes Pupo
Published: July 2023

Neste trabalho foram estudados dois sistemas utilizando reações de Fenton para a remediação deum solo contaminado com p,p ́ DDT. O primeiro envolveu a formação de uma lama com o solo contamina-do, na qual foram adicionados os reagentes de Fenton. No segundo, não houve a formação de lama e osreagentes foram adicionados diretamente ao solo por meio de um “tubo injetor”. Foram avaliados algunsparâmetros que podem influenciar a reação de Fenton, tais como minerais de ferro naturalmente presentesno solo e a irradiação solar. A principal espécie mineral de ferro encontrada no solo é a hematita (Fe 2 O 3 ), queteve pouca influência na degradação do contaminante. Nos experimentos com lama sem adição de ferrosolúvel a porcentagem de degradação do p,p ́ DDT foi inferior a 25% após 24 horas de reação. Nos ensaioscom lama na presença de ferro solúvel, a degradação do p,p ́ DDT atingiu 70% em 32 horas, enquanto quenos experimentos sem lama, a porcentagem de degradação foi de 32% no mesmo intervalo de tempo. Emambos os sistemas, a irradiação solar teve pouca influência na degradação do contaminante.
Electrochemical evaluation of lipophilic antioxidants from Iryanthera juruensis fruits (Myristicaceae)
Authors: Silva Dulce Helena Siqueira , Pereira Francisco Claudece , Yoshida Massayoshi , Zanoni Maria Valnice Boldrin
Published: July 2023

TLC autographic assays revealed in the hexane extract of Iryanthera juruensis (Myristicaceae)the presence of two compounds, with antioxidant properties towards β-carotene. They were isolated andidentified as 3-methyl-sargachromenol (1) and sargachromenol (2). Further investigation of the hexaneextract led to isolations of 3-methyl-sargaquinoic acid (3) and sargaquinoic acid (4). The electrochemicalbehaviour of these compounds was studied in CH 2 Cl 2 /Bu 4 NBF 4 at glassy carbon electrode. The phenolicgroup in both tocotrienols 1 and 2 are oxidized at +0.23V and +0.32V and their oxidation potentials arecorrelated with the observed antioxidant activities and oxidation mechanism of α-tocopherol. The reductivevoltametric behaviour of quinone function in both plastoquinones 3 and 4 is discussed.
Estudo do comportamento térmico dos compostos de Ag+ e Pb2+ com o ligante 1,4-bis(3-carbóxi-3-oxo-prop-1-enil)benzeno
Authors: De Oliveira José Dilson Silva , Barilli Deoclécio José , Hamer Marisa , Siqueira Onofre Salgado , Ionashiro Massao
Published: July 2023

Este trabalho reporta o estudo de compostos binários do dicarboxilato 1,4-bis(3-carbóxi-3-oxo-prop-1-enil)benzeno, C 6 H 4 (-CH=CH-CO-COO-) 2 , com os cátions metálicos Ag + e Pb 2+ , obtidos a partir desoluções aquosas do ligante e dos nitratos dos cátions metálicos, em proporções estequiométricas. Para acaracterização e o estudo do processo de decomposição térmica desses compostos foram empregadasEspectrofotometria de Absorção na Região do Infravermelho com Transformada de Fourier (FT-IR), Análi-se Elementar (C, H), Complexometria com EDTA, Termogravimetria (TG) e Calorimetria Exploratória Dife-rencial (DSC).
Determinação de ácidos carboxílicos em composto de resíduos sólidos urbanos por cromatografia gasosa com detector de ionização em chama
Authors: Aquino Felipe Thomaz , Santiago-Silva Mary Rosa
Published: July 2023

Um método simples e eficiente para determinação simultânea de quatro ácidos carboxílicosde cadeia curta (acético, propiônico, butírico e valérico) em resíduos sólidos urbanos (RSU) é descritono presente trabalho. Estes ácidos são considerados fitotóxicos na literatura e a variabilidade das suasconcentrações durante o processo pode ser usada como parâmetro da maturação do composto de resí-duos sólidos urbanos (RSU).A determinação dos ácidos carboxílicos presentes no composto de RSU envolve uma extração em águae filtração em membranas de polifluoreto de vinilideno (PVDF), seguida da injeção direta em um cro-matográfo a gás com detector por ionização em chama (CG-DIC).Foram analisados três tipos de leira. Boas linearidades e coeficientes de correlação foram obtidas paratodos os ácidos, e os limites de detecção e quantificação foram baixos, resultando em um método sen-sível para monitoramento desses ácidos em composto de RSU.
Determinação de chumbo em álcool combustível por voltametria de redissolução anódica utilizando um eletrodo de pasta de carbono modificado com resina de troca iônica Amberlite IR 120
Authors: Bergamini Márcio Fernando , Vital Saulo Lotti , Dos Santos Andre Luiz , Stradiotto Nelson Ramos
Published: July 2023

Um método envolvendo a pré-concentração e redissolução anódica em condições devoltametria de pulso diferencial empregando um eletrodo de pasta de carbono modificado (EPCM)com uma resina de troca iônica Amberlite IR120 foi proposto para a determinação de íons chumbo emálcool combustível. O procedimento é baseado em um pico de oxidação do analito observado em -0,53V(vs. Ag/AgCl) em solução de HCl. As melhores condições experimentais encontradas foram: 5%(m/m) da Amberlite IR120 para a construção do eletrodo, solução de HCl 0,1 mol L -1 , velocidade devarredura de 10 mVs -1 , tempo de pré-concentração de 15 min e amplitude de pulso de 100 mV.Utilizando essas condições, o EPCM apresentou uma resposta linear entre a corrente de pico anódicae a concentração de íons chumbo para o intervalo entre 9,9 x 10 -9 e 1,2 x 10 -6 mol L -1 e um limite dedetecção de 7,2 x 10 -9 mol L -1 . Valores de recuperação entre 96 % e 102 % foram encontrados paraamostras de álcool combustível enriquecidas com Pb 2+ em níveis de 10 -7 mol L -1 . O efeito da pre
A new approach to determining the blending octane number of gaseous components of motor gasolines
Authors: Kovaleva E. B. , Dyachkova S. G. , Ganina A. A. , Kuzora I. E. , Sergeev V. A.
Published: July 2023

The octane number for gaseous components (GC) is currently determined using the calculation method proceeding from the hydrocarbon composition. The method provides determination of the research octane number (RON) only. A discrepancy between the actual and predicted values of the octane number thus determined leads to an overestimated introduction of these components into the fuel which results in the reduced fuel performance and economic indicators of the production. In this regard, the development of a new approach to the determination of the blending octane number of low-boiling components is extremely important for designing optimal formulations of motor fuels. A method for determining the blending octane numbers (both RON and MON) of motor gasoline gaseous components has been improved due to preliminary sample preparation by bubbling which provided taking into account the proportion of involving fractions of C4 hydrocarbon and pentane-amylene along with the chemical nature of the base fuel components. It is shown that the value of the blending octane number for gaseous components depends on the hydrocarbon composition of the base component. Application of the developed method to determining the blending octane number of gaseous components of motor fuels allowed us to obtain optimal formulations of gasoline with the involvement of low-boiling by-products and increased the accuracy of forecasting the composition of fuels thus improving the economic performance of the production.
Artificial intelligence, neural networks, big data, and mathematical research methods
Authors: Orlov A. I.
Published: July 2023

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On the reasons for the premature failure of safety valve springs in the equipment of the primary oil refining
Authors: Tupitsin M. A. , Trishkina I. A. , Storozheva E. I.
Published: July 2023

The reasons for the premature failure of a spring made of steel 50KhFA used in the safety valve of the column head part of the flare facility were analyzed. The failure of the spring occurred after 7 years of operation at a temperature below 90°C in a working environment of light oil products (sulfurous gasoline). Visual and measurement control, chemical analysis of the steel composition, energy-dispersive X-ray spectroscopy (EDS) of metal in local areas, macro- and microstructural analysis, macro- and electron fractography, phase chemical and X-ray structural analysis, hardness and microhardness tests and reductive heat treatment were used in the research. The data on the characteristic external signs, typical micro damages, and the mechanism of destruction under low-temperature hydrogen sulfide corrosion of steel 50KhFA with hydrogenation, the most dangerous accompanying process, were gained in the study. According to the results obtained, the chemical composition and hardness of the spring metal meet the requirements of the standards for steel 50KhFA. The microstructure of the studied metal is tempered martensite with a decarburized layer up to 0.158 mm in thickness present on the surface. The analysis of the results showed that the premature failure of the spring is attributed both to technological heredity and contact with the working environment unauthorized by the project. An ulcerative damage of the metal surface and penetrating of corrosion products into the depth of metal due to violation of the integrity of the spring coating were revealed, which indicates a low resistance of 50KhFA steel to low-temperature hydrogen sulfide corrosion. The failure occurs predominantly near non-metallic inclusions along the boundaries of primary austenitic grains, where the largest precipitates of chromium carbides are located, as well as along the interphase boundaries of oriented carbide plates.
Single Nucleotide Polymorphism of LDLR Gene as Atherogenesis Markers on Macaca fascicularis and Macaca nemestrina
Authors: Saepuloh Uus , Nenden Shanazvira Azizah  , Darusman Huda S , Farajallah Dyah Perwitasari
Published: July 2023

Long-tailed macaques (Macaca fascicularis) and pig-tailed macaques (M. nemestrina) are non-human primate species that most commonly used as animal model in the study of atherosclerosis.  Genetic variation in the low density lipoprotein receptor gene (LDLR) has been associated with normal variations in plasma lipid profile and the risk of coronary heart disease (CAD) in humans. In this study, the screening of nucleotide polymorphisms on LDLR genes as molecular markers of atherogenesis in M. fascicularis and M. nemestrina was performed. The LDLR gene of exon region 6 is amplified with a specific primers. The nucleotide sequences of the amplicons is determined by the sequencing technique and the results were bioinformatic analyzed. Analysis of exon 6 region LDLR gene in M. fascicularis and M. nemestrina revealed no SNP in this exon. Based on the alignment results, the entire sample has a type of haplotype I. The type of haplotype owned by the six animals is related to the hyper-repons. Both of this species are a potential species for animals model in the study of atherosclerotic disease. The use of exon 6 as a genetic marker of M. fascicularis and M. nemestrina on a fat cholesterol diet makes the animal selection of hypo- from hyper-responder are more efficient.
Konya Ekolojik Şartlarında Kültürü Yapılan Aynısefa (Calendula officinalis L.) Bitkisinin Farklı Ekim Zamanlarının Kalite Özellikleri Üzerine Etkisinin Belirlenmesi
Authors: AYRAN İrem , KAN Yüksel
Published: July 2023

Amaç: Aynısefa (Calendula officinalis L), Asteraceae familyasına ait tek yıllık, otsu gövdeli bir bitkidir. Eski çağlardan bu yana halk arasında tıbbi ve kozmetik amaçlı kullanılmaktadır. Aynısefa bitkisi kimyasal kompozisyonu nedeniyle geleneksel ve tamamlayıcı tıp uygulamalarında soğuk algınlığında, yara tedavilerinde, ateşli hastalıklarda, böcek ısırıklarında, bebek pişiklerinde, diş eti hastalıklarında, hemoroidde, mide kramplarında ve fitoterapide kullanılmaktadır. Bitkinin parlak sarı ve turuncu renkteki güzel çiçekleri peyzaj alanlarında ve kesme çiçekçilikte süs bitkisi olarak kullanım alanı bulmaktadır. Bu çalışma ile Konya ekolojik koşullarında yetiştirilen aynısefa (Calendula officinalis L.) bitkisinde ekim zamanlarının bazı kalite özellikleri üzerine etkisi incelenmiştir.

Materyal ve Yöntem: Tarla çalışmaları Mart- Ağustos 2017 yetiştirme döneminde “Tesadüf Blokları Deneme Desenine” göre 3 tekrarlamalı olarak kurulmuştur. Kültüre alınan aynısefa çiçeklerinde toplam fenolik ve flavonoid miktarı, uçucu yağ verim ve bileşenleri, sabit yağ verim ve bileşenleri incelenmiştir.

Araştırma Bulguları: Yapılan analiz sonuçlarına göre; toplam fenolik miktarı 513.25 - 575.15 mg GAE/L, toplam flavonoid miktarı 91.08 - 110.13 mg QEs/L, çiçek uçucu yağ verimleri % 0.02 - 0.08, çiçek uçucu yağ major bileşenlerinden alfa-kadinol miktarı % 35.6 - 39.9, çiçek sabit yağ verimi % 5.52 - 6.17 ve çiçek sabit yağ bileşenlerinden doymamış yağ asitlerinin toplamı % 41.53 - 49.15 arasında belirlenmiştir.

Sonuç: Çalışmada aynısefa çiçeklerinin uçucu ve sabit yağ verimi ekim zamanı geciktikçe artmasına rağmen, farklı ekim zamanlarının uçucu yağ ve sabit yağ bileşenlerinde farklılığa neden olmadığı tespit edilmiştir. Toplam flavonoid miktarının ekim zamanı geciktikçe arttığı, toplam fenolik miktarının ise Nisan ayının ilk haftası yapılan ekimlerde yüksek olduğu sonucuna varılmıştır.
Yetiştirici Koşullarında Akkaraman Irkı Koyunlarda Döl Verimi ile Kuzularda Büyüme ve Yaşama Gücü Özelliklerinin Belirlenmesi
Authors: TÜFEKCİ Hacer
Published: July 2023

Amaç: Bu çalışma yetiştirici koşullarında Akkaraman ırkı koyunlarda döl verimi, kuzularda büyüme ve yaşama gücü özelliklerini incelemek amacıyla yapılmıştır.

Materyal ve Yöntem: Araştırmanın hayvan materyalini 460 baş Akkaraman koyunu ve 537 baş kuzu oluşturmuştur. Koyunların döl verim özelliklerinin belirlenmesi amacıyla doğum, tekiz doğum, ikiz doğum, bir doğumdaki kuzu sayısı ve kuzuların büyüme özelliklerinin belirlenmesi için doğum ağırlığı, 60, 90, 120 ve 150. gün canlı ağırlığına ait veriler kullanılmıştır.

Araştırma Bulguları: Koyunlara ait döl verim özelliklerinden kuzulama oranı %95.8; ikiz doğum oranı %21.8 ve doğuran koyun başına düşen kuzu sayısı 1.22 olarak hesaplanmıştır. Akkaraman kuzularına ait doğum ağırlığı 3.71 kg iken 60., 90., 120. ve 150. gün canlı ağırlığı sırası ile 15.54 kg, 23.30 kg, 31.08 kg ve 38.85 kg olarak tespit edilmiştir. Çalışmada elde edilen yaşama gücü değerleri 60, 90, 120 ve 150. günde sırası ile %97.6, %96.3, %94.8 ve %94.4 olarak hesaplanmıştır.

Sonuç: Sonuç olarak yetiştirici koşullarında Akkaraman ırkı koyunlardan elde edilen döl verimi ve kuzuların bazı büyüme özellikleri literatürde bildirilen değerler ile uyum içerisinde olduğu görülmüştür.
SWOT/TOWS Analizi Kapsamında Terapatik Peyzaj Tasarım ve Planlama Stratejilerinin Belirlenmesi: Ordu Ahmet Cemal Mağden Huzurevi Örneği
Authors: ŞENGÜR Şeyma , KEPEZ Berika
Published: July 2023

Amaç: Yaşlılık süreci, bireylerin birtakım hastalıklar, rahatsızlıklar ile ruhsal ve mental problemlerin arttığı, bireyin tamamen veya kısmen bir başkasına ihtiyaç duyduğu bir evreyi ifade etmektedir. Yaşlı bireylerin fiziksel ve ruhsal sağlıklarının iyi olmaları yaşadıkları çevrenin kalitesi ile paralellik gösterir. Bu anlamda, yaşlıların yaşadığı çevre peyzajının kalite düzeyi bireyler üzerindeki tam iyilik halini korumak ve gözetmek açısından büyük önem taşımaktadır. Çevre ve sağlık arasındaki ilişkinin fiziksel ve ruhsal iyileşme sürecine katkı sunmasının tespit edilmesi ile birlikte hastane, yaşlı bakım evi, huzurevi gibi kuruluşların bahçeleri terapatik bahçe/terapatik peyzaj kapsamında değerlendirilmesi gereken alanlar olarak karşımıza çıkmaktadır. Bu araştırma ile, Ordu ilinde bulunan Ahmet Cemal MAĞDEN huzurevi bahçesinin terapatik peyzaj tasarım konseptine ilişkin mevcut potansiyelinin ortaya konulması amaçlanmakta olup bu kapsamda planlama ve tasarım ölçeklerinde stratejilerin belirlenmesi hedeflenmektedir.

Materyal ve Yöntem: Araştırmanın materyalini Ordu İli Altınordu İlçesi’nde yer alan Ahmet Cemal Mağden Huzurevi’nin bahçesi oluşturmaktadır. Çalışmada peyzaj planlama yöntem tekniklerinden olan SWOT analizi (Strength/ Güçlü Yön, Weakness/ Zayıf Yön, Opportunities/ Fırsat, Threats/ Tehditler) ile eyleme yönelik stratejilerin belirlenmesine olanak sunan TOWS analizi (Threats/ Tehditler, Opportunities/ Fırsat, Weakness/ Zayıf Yön, Strength/ Güçlü Yön) yöntemleri kullanılmıştır. Bu yöntemlerden SWOT analizi LAWSHE tekniği ile 5 uzmanın değerlendirmesine tabi tutulmuş ve elde edilen son SWOT analizi verileri TOWS matrisine dâhil edilmiştir.

Araştırma Bulguları: Araştırma alanına yönelik terapatik peyzaj kapsamında yürütülen SWOT analizi gerçekleştirilmiş olup Lawshe tekniği kapsamında 5 uzman değerlendirmesinin ardından 14 Zayıf Yön, 9 Güçlü Yön, 7 Tehdit ve 8 Fırsat bulgularına ulaşılmıştır. Bu bulgular TOWS matrisine dahil edilerek planlama ölçeğinde 4 sayıda, tasarım ölçeğinde 2 sayıda strateji geliştirilmiştir.

Sonuç: Araştırma sonucunda Ahmet Cemal Mağden Huzurevinin terapatik peyzaj konsepti açısından mekânsal olarak uygunluğu planlama ve tasarım ölçeğindeki analizler doğrultusunda tespit edilmiştir. Mekansal olarak önemli bir potansiyele sahip alanın geliştirilen 6 temel strateji ile terapatik peyzaj yaklaşımı için uygun olabileceği öngörülmektedir. Temel strateji alanda sürdürülebilir Terapatik Peyzaj Tasarımının gerçekleştirilmesi ve hortikültür terapi programlarının Huzurevi’nin işleyişine dahil edilmesi şeklindedir. Bu kapsamda Huzurevi binasının depreme dayanıklı bir yapıya dönüşmesi, Evrensel tasarım ilkelerinin sürece dahil edilmesi, drenaj probleminin çözülmesi, bitkisel tasarımın güçlendirilmesi ile deniz tuzlu rüzgarlarının önlenmesi ve güvenliğin arttırılması, alanın güneyindeki sahil yolunu da kapsayacak alan içi ve alan dışı ulaşım sisteminin kurgulanması hedefleri ivedilikle gerçekleştirilmelidir.