bluuebunny/crossref_metadata_2025 huggingface dataset:
Dynamics of the lipoperoxidation process in the oral fluid of patients with chronic generalized periodontitis with the complex application of laser therapy and interval hypoxic training
Authors:   OOO “Vitam”, Moscow, Dzgoeva I. V. , Remizova A. A. ,   Laboratory of Dentistry and Medical Technologies, Scientific and Educational Center for Applied Medicine and Food Safety, Lomonosov Moscow State University, Moscow, Nagornev S. N. ,   FSBI Center for Strategic Planning and Management of Biomedical Health Risks, FMBA of Russia, Moscow, Frolkov V. K. ,   FSBI Center for Strategic Planning and Management of Biomedical Health Risks, FMBA of Russia, Moscow
Published: June 2022

The performed research is devoted to the study of lipid peroxidation processes in patients with chronic generalized periodontitis under the conditions of the course application of infrared laser therapy and normobaric interval hypoxic training. The results of the study allow us to conclude that the development of inflammatory destructive processes in periodontal tissues closely correlates with manifestations of oxidative stress, which develops as a result of an imbalance in the pro-oxidants-antioxidants system. Supplementing the standard therapy of chronic generalized periodontitis with the course use of physiotherapeutic factors in the mono-influence mode is accompanied by an increase in the potential of the antioxidant protection of the oral cavity. The complex use of physiofactors contributes to an increase in the activity of the antioxidant system, realized through the mechanisms of functional potentiation. The close relationship revealed between lipid peroxidation products and index characteristics of dental status, reflecting the pathogenetic role of pro-oxidant factors in the development of chronic generalized periodontitis, allows us to consider biomarkers of peroxide metabolism and the antioxidant protection coefficient as criteria for the effectiveness of the treatment.
Restriction of working hours of distance workers and the interests of employers: legal issues
Authors:   Federal State Budgetary Educational Institution of Higher Education ", Sapphirova A.A. ,   Kuban State Agrarian University named after I.T. Trubilin",   , Krasnodar
Published: June 2022

The article deals with the issues of limiting working hours in relation to remote workers in the period of digitalization of the economy, when there is practically no legal regulation of the duration of daily work, which is the basis for employers to abuse their rights. The novelties in the Labor Code of the Russian Federation, effective from 01/01/2021, did not solve the problems, and the norms regulating remote work did not clearly establish this duration of daily work. In general, the limitation of working time is compensated by rest time, which allows the employee to avoid professional fatigue and burnout. The article provides examples of the relationship between working hours and the interests of employees and employers.
Refusal to moving to another location and the right to a fair dismissal: problems of law enforcement practice
Authors:   Saratov State Law Academy, Abalduev V.A.
Published: June 2022

The norms of the Labor Code of the Russian Federation and judicial practice in cases related to the refusal of employees to move to another area are being studied. This has acquired particular relevance in connection with the adoption of the Resolution of the Constitutional Court of the Russian Federation of January 20, 2022 No. 3-P. Particular attention is paid to the incorrect practice of dismissal under paragraph 7 of Part 1 of Art. 77 of the Labor Code of the Russian Federation in cases of refusal to move in situations that are not reflected in the law. Based on a general assessment of law enforcement and taking into account the position of the Constitutional Court of the Russian Federation, a universal concept for regulating the relations in question in the Labor Code of the Russian Federation is proposed, which guarantees employees the right to a fair dismissal and protection of their interests in this case.
Social guarantees in job loss and unemployment
Authors:   Novosibirsk State University of Economics and Management, Markeev A.I. , Zinovieva V.V. ,   Novosibirsk State University of Economics and Management, Mishkina A.K. ,   Novosibirsk State University of Economics and Management, Emelyanov N.A. ,   Novosibirsk State University of Economics and Management
Published: June 2022

In this article, special attention is paid to such a phenomenon as unemployment, as well as proximity, what special support people have, the special status of the unemployed. This problem has been and remains relevant, especially at the present time, maximum unemployment due to misleading. The article considers the decision “unemployment”, the causes of these phenomena, its consequences, and also considers aspects of social support: problems and prospects of social support, legal regulation and problems of protection from settlements in modern conditions.
Factors Affecting Indonesian Higher Education Institution Students’ Academic Achievement in the Industry 4.0 Era
Authors: Andika Aditya , Louwisia Fabiola J. Y. , Susilo Claudia F. , Victoria Aurellia
Published: June 2022

Industry 4.0 presents new challenges for Higher Education Institutions in Indonesia. Jobs in this era requires intellectual capabilities at a higher level. One of the ways to measure intellectual capabilities is through Academic Achievement in the form of Grade Point Average (GPA). Organizations around the world, including in Indonesia, want employees with high GPA. Therefore, it is imperative for Higher Education Institutions in Indonesia to understand the factors affecting Students’ Academic Achievement. This study conducts literature reviews to find and analyse factors affecting Indonesian Students’ Academic Achievement in Industry 4.0 era. This study finds 28 factors. Based on these factors, this study develops development initiatives that Indonesian Higher Educations Institutions in Indonesia can do in order to improve Indonesian students’ academic achievement.
The Essential Aspects of Teaching Children to Read in English
Authors: Hartati Hartati , Susanti Siti Misra , Henny Henny , Kurniati Asma , Marwah Marwah
Published: June 2022

This paper aims to introduce the essential aspects that teachers should know in teaching children to read in English. The age level of the children referred to in this paper are children aged 5 to 7 years. The aspects include the characteristics of children, the importance of teaching children to read in English, decoding and phonemic awareness. The aspects were selected from the results of the analysis of previous related literature that are still considered important for discussion so as to provide new treasures for teachers in particular. With this paper, it is hoped that it can enrich information about teaching young chidren to read in English and increase the teacher's insight about teaching young children to read in English so that teaching reading can take place effectively.
Penentuan Harga Beli Opsi Asia Menggunakan Monte Carlo-Antithetic Variate dan Monte Carlo-Control
Authors: Zubedi Fahrezal , Achmad Novianita , Mahmud Sri Lestari , Mowuu Rusli
Published: June 2022

Math is applicable in many fields, including financial computing and discussing options. Options are contracts between two parties. The first part acts as a buyer with non-obligatory rights to buy or sell from the second party, who act as the seller with particular assets of predetermined time and price. This research aims to compare the monte Carlo-Antithetic Variate and monte Carlo-Control Variate in determining the purchase price of the Asian option. This study uses data from the closing price of the daily stock of PT Adhi Karya Tbk from October 1st, 2018 – to November 27th, 2019. The findings revealed varying option prices and different error standards. The Antithetic Variate simulation produces option price Rp. 246,6821 and error standard 0,071495 in 10000000th simulation and the Control Variate simulation produce option price Rp. 183,2139 and error standard 0,09716 in the 5000th simulation.  The result was that the Control Variate was considered better at determining Asian option purchase price because of the smaller option and faster error standard in approaching zero.
Pemodelan Pneumonia Berat Menggunakan Regresi Zero Inflated Negative Binomial di Gorontalo
Authors: Achmad Novianita , Payu Muhammad Rezky Friesta , Rahim Yolanda
Published: June 2022

In certain cases, the response variable has an excess zero that causes overdispersion. Therefore, to overcome overdispersion because excess zero Zero-inflated negative binomial regression can be used. The purpose of this study is to apply Zero inflated negative binomial regression to model the case of severe pneumonia in Bone Bolango and on the city of Gorontalo. Based on the result of ZINB Regression, it was found that there are 3 (three) factors that are significant that is ASI, Vitamin A, and low birth weight.
Model Matematika Optimasi Multi-Objektif Penurunan Beban Limbah Biochemical Oxygen Demand pada Instalasi Pengolahan Air Limbah
Authors: Kamilah Shelly Sholatan , Sunarsih Sunarsih , Udjiani Titi
Published: June 2022

The increase in community activities causes the amount of wastewater to increase. This wastewater comes from industrial production processes and from the community activities which are domestic wastewater. Domestic wastewater must be treated before being discharged to water sources because it contains pathogenic organisms. The place for treating domestic wastewater is Wastewater Treatment Plant (WWTP). The main purpose of WWTP is to degrade the Biochemical Oxygen Demand (BOD) and pathogenic organisms. This study develops a multi-objective optimization mathematical model for reducing the BOD load in the WWTP. This optimization model has three objective functions, namely maximizing the BOD load that is treated in the pond minimizing the difference between the BOD reduction efficiency value in the WWTP with the reference efficiency value and minimizing the power used by the aerator. The simulation results show that the maximum BOD load that can be treated in facultative ponds I and II is 1,589.688 Kg/day while for facultative ponds III and IV is 1,727.158 Kg/day. The efficiency value of reducing BOD load is influenced by the residence time variable, where the efficiency value of reducing the BOD load for facultative ponds I and II by 54% while for facultative ponds III and IV by 57%. The power used by the aerator is influenced by the treated BOD load variable, the aerator power in facultative ponds I and II is 49.67775 Kwh while in facultative ponds III and IV it is 53.97369 Kwh.
Pengelompokan Jenis Penerimaan Pajak di Kota Makassar Menggunakan Fuzzy Clustering
Authors: Irwan Irwan , Sidjara Sahlan , Aryati Asmelia Putri
Published: June 2022

This research discusses grouping types of tax receipts in the City of Makassar with the method of Fuzzy C-Means (FCM). The data used are secondary data from the tax office in the form of the amount of the receipts of income tax, value-added tax, and land tax building each district in the year 2018. The discussion starts from the theory of fuzzy clustering, simulation, and the characteristics of the simulation results. In this study, the obtained number of clusters the optimum, namely the 7 clusters that have the potential for tax revenue is relatively high, namely at cluster seven consists only of the District Tamalanrea, and the lowest in the cluster a sixth consisting of the Kecamatan Tallo, Ujung Tanah, and Sangkarrang. After hashing on a cluster that is formed can be used to see the level of the welfare of the community in each district.
Aplikasi Geometric Brownian Motion dengan Jump Diffusion dalam Memprediksi Harga Saham Liquid Quality 45
Authors: Ditasari Prilia , Rohaeti Embay , Kamila Isti
Published: June 2022

At the beginning of 2021, stock LQ45 experienced a significant spike in stock prices, making the stock price difficult to predict and the profits obtained by investors uncertain. The purpose of this study is to predict the stock price of LQ45 using the Geometric Brownian Motion model with Jump Diffusion and determine investment by comparing the expected return and return of stock price prediction results. This study uses a Geometric Brownian Motion model with Jump Diffusion to predict stock prices because it can predict when stock prices experience price spikes and fluctuations. Based on the results of the study, of the 45 stocks listed on LQ45 stock, only nine stock companies were selected that had a normally distributed return whose stock price was predicted by applying the Geometric Brownian Motion model with jump-diffusion and each MAPE value obtained was in the very good category. There are six stock companies with investment decisions in the form of buying shares, including Ace Hardware Indonesia Tbk, Bank Central Asia Tbk, Charoen Pokphand Indonesia Tbk, Indofood CBP Sukses Makmur Tbk, Vale Indonesia Tbk and Indah Kiat Pulp Paper Tbk. Three stock companies with investment decisions in the form of selling shares including, Bank Rakyat Indonesia (Persero) Tbk, Jasa Marga (Persero) Tbk and Mitra Keluarga Karyasehat Tbk.
Emission Saving Potentials of Freight Transportation in Europe: Shifting Road to Rail Transport?
Authors: Wedemeier Jan , Jahn Malte , Wolf André
Published: June 2022

This paper aims at investigating the savings potential of increasing the share of rail transport in the European freight transport sector regarding greenhouse gas emissions. This paper sets itself apart by using the realized modal shift instead of the potential as the starting point for calculating the associated potential reductions in GHG emissions. The expected emission reductions associated with shifting long-distance freight transport from road to rail until 2030, as considered in this paper, are estimated using the modal shift of EU-member states with the base year 2017 and national growth rates of rail share from 2005 to 2017. The expected emission reductions are relatively small compared to the total emissions of the growing freight transport sector although (very) ambitious scenarios were assumed. To achieve a substantial reduction in greenhouse gas emissions, transport initiatives must be complemented by a reduction in the specific emissions of the respective modes of transportation. The paper closes with a short outlook for the development of the transportation sector.
Investigasi Kepuasan Pelanggan dan Kualitas Pelayanan Menggunakan Metode Servqual dan Kano
Authors: Nugraha Muhammad Candra
Published: June 2022

The purpose of this study was to determine the level of customer satisfaction of a coffee business in Padang, West Sumatra. The method used is Servqual and the measurement of service quality is the Kano method. This study explores the quality of service that has an impact on customer satisfaction at a coffee business in Padang. The type of data in this study is primary data in the form of a questionnaire that has been distributed to respondents. The number of samples in the study amounted to 100 respondents. The results of the study show that0 with the Servqual method, it is found that the gap scores for 27 service attributes measured in this study produce a negative value, and 1 service attribute produces a positive value. There are 24 one-dimensional attribute categories, which means that consumer satisfaction is proportional to the performance of the attributes. The higher the attribute performance, the higher the customer satisfaction. And 3 attributes of the reverse category, which means the degree of customer satisfaction is higher if the service does not exist.
Geosentetik Donatılı İstinat Duvarı ile Betonarme İstinat Duvarının Karşılaştırmalı Analizi: Kastamonu-Karabük Karayolu Örneği
Authors: YUMRUTAŞ Halil İbrahim , KESKİN İnan , AYDIN Ulaş
Published: June 2022

Dolgu uygulaması karayolu ve demiryolu inşaatlarında sıklıkla karşılaşılan bir uygulamadır. Bu çalışmada dolgu stabilizasyonunu sağlamak amacıyla yapılan ve geleneksel sanat yapılarından olan betonarme istinat duvarı ile geosentetik (geogrid) donatılı istinat yapısı maliyet, yapım süresi, hizmete açılma süresi, estetiklik ve hizmet ömrü kriterleri dikkate alınarak karşılaştırmalı olarak analiz edilmiştir. Mukayeseler, Karayolları Genel Müdürlüğü (KGM) tarafından uygulama yapılmakta olan aynı karayolu üzerindeki farklı iki lokasyondaki mühendislik yapıları üzerinde yapılmıştır. Birinci lokasyonda mevcut geosentetik donatılı duvar yerine betonarme istinat duvarı projelendirilirken, ikinci lokasyonda ise mevcut betonarme istinat duvarı yerine geosentetik donatılı duvar projelendirilmiştir. KGM pozları doğrultusunda maliyet analizleri yapılmıştır. Özellikle yükseklik artışına paralel olarak geosentetik donatılı duvarların maliyet açısından avantajlı duruma geçtiği sonucuna ulaşılmıştır. Ayrıca hizmet ömrü, inşa süresi, kullanıma açılma süresi ve estetiklik kriterleri açısından performansları değerlendirildiğinde ise geosentetik donatılı duvarların daha avantajlı olduğu ortaya konulmuştur. Çalışma sonuçlarından elde edilen bilgilerin, yol çalışmalarında dolgu stabilite sorunu ortaya çıkan lokasyonlarda hem performans hem de maliyet açısından hangi sanat yapısının tercih edilmesinin daha uygun olacağının karar verilmesine katkı sunulacağı düşünülmektedir.
DH-PIM İletim Yöntemi için Bir Hata Düzeltme Yapısı
Authors: SONMEZ Mehmet
Published: June 2022

Yapılan çalışmada optik haberleşme sistemleri için önerilen DH-PIM yöntemi için hata düzeltme yapılarının performans analizi incelenmiştir. Silme ve Yanlış Alarm hataları için uygulanabilir bir sistem modeli Görünür Işık Haberleşme (Visible Light Communication: VLC) sistemlerine entegre edebilmek için elde edilmiştir. Yapılan çalışmada model için terorik bir analiz verilmiştir. Silme hatası yapısı için bir FPGA (Field Programmable Gate Arrays: Alanda Programlanabilir Kapı Dizileri) derleyicisi Quartus programında yeni bir sayısal devre tabanlı mimari geliştirilmiştir. Sonuçlar Modelsim-Altera Programında zamana göre incelenmiştir. Alınan sonuçlara göre, önerilen sayısal devre tabanlı hata düzeltme yapısının başarılı bir şekilde hatalı slotları düzeltebildiği görülmüştür. Ayrıca teorik ifadesi elde edilen hem silme hatası hem de yanlış alarm hatası için slot hata oranı performansları incelenmiştir. Elde edilen sonuçlara göre geleneksel DH-PIM (G-DHPIM) sistemine göre sadece silme hatası uygulanan sistem (S-DHPIM) daha iyi bir slot hata performansı vermiştir. Ayrıca, hem silme hatası hem de yanlış alarm hatası uygulanan DH-PIM sisteminin (SY-DHPIM) de S-DHPIM göre daha iyi bir slot hata performansı verdiği izlenmiştir.
Homojen ve Heterojen Filolu, Kapasite Kısıtlı Araç Rotalama Problemi İçin Bir Uygulama
Authors: ŞEHİTOĞLU Adem , AĞAYEVA Çerkez
Published: June 2022

Günümüz rekabet dünyasında firmalar ürünlerinin müşterilerine ulaştırılması aşamasında, büyük bir öneme sahip olan lojistik desteği sağlamak adına maksimum bir çaba içerisindedirler. Araç rotalama problemleri (ARP), Lojistik problemlerinin en önemli son aşamasıdır. Araç rotalama problemleri, en kısa mesafede ve en kısa sürede müşterilerinin taleplerini karşılayacak şekilde bir depodan aynı veya farklı kapasitelerdeki araçlar ile optimale yakın rotaların bulunması problemleridir. ARP, artan çeşitleri ile firmalara en iyi sonuçları sunmaya devam etmektedir. Bu çalışmada bir ekmek fabrikasının 20 markete ekmek dağıtımı sırasında kullandığı gerçek mesafeler ve koordinatlar kullanılarak rotalar oluşturulmuştur. Bu gerçek hayat problemini modellemede klasik kapasiteli araç rotalama modeli hem homojen hem de heterojen filolu olarak modellenmiştir. Problem için optimale yakın çözümü, tavlama benzetimi (TB) algoritması kullanılarak Matlab’da hesaplanmıştır. TB ile elde edilen meta sezgisel çözümler ekmek fabrikasının kendi rotaları ile karşılaştırılmıştır. TB ile elde edilen optimale yakın sonuçlar yapılan tüm testlerde fırının kendi toplam rota mesafelerinden daha iyi sonuçlar vermiştir. TB algoritmasını kullanarak, iki araç ile yapılan dağıtım sırasında oluşan toplam rota mesafesinin fırın ile en büyük farkı 8,8 km’dir. TB’de üç araç ile yapılan dağıtım sırasında oluşan toplam rota mesafesinin fırın ile en büyük farkı 6,5 km olarak hesaplanmıştır.
Ankastre Bir Kirişin Ayrık Zamanlı Titreşim Modelinin Meta-sezgisel Optimizasyon Yöntemleri Kullanılarak Elde Edilmesi
Authors: ÇAŞKA Serkan , DOKUZ Muhammed Enes
Published: June 2022

Bu çalışmada, ankastre bir kiriş Ansys programında 3 boyutlu olarak modellenmiştir ve kirişe 5 kN’lik bir giriş kuvveti uygulanarak kirişin serbest ucunda meydana gelen yer değişimleri kaydedilmiştir. Kirişe uygulanan giriş kuvveti ve kirişin serbest ucunda oluşan yer değişimine ait çıkış veri seti kullanılarak literatürde dinamik sistemlerin modellenmesinde başarıyla uygulanmış Genetik Algoritmalar ve Parçacık Sürüsü Optimizasyonu yöntemleri ile ayrık zamanlı titreşim modelleri elde edilmiştir. Titreşim modellerinin modelleme başarısını içeren sonuçlar tablo halinde sunulmuştur. Ayrıca, Ansys programından alınan titreşim verisine ait harmonikler ve ayrık zamanlı modellere ait harmonikler Matlab/Simulink ortamında elde edilmiştir. Ayrık zamanlı titreşim modellerinin çıkış grafikleri ve harmonikleri incelendiğinde kirişin çıkış grafikleri ve harmoniklerine oldukça yakın olduğu tespit edilmiştir. Ayrık zamanlı modellerin kirişin titreşim davranışını başarıyla temsil ettiği görülmüştür.
Determination of Optimum PGPB-Priming Protocol on Germination and Seedling Growth in Lentil
Authors: ERMAN Murat , ÇIĞ Fatih , CERİTOĞLU Mustafa
Published: June 2022

Plant growth promoting bacterias (PGPBs) can be described as bacterial strains increasing water and nutrient uptake, gaining nitrogen and phosphorus to plants by biological nitrogen fixation and phosphate mineralization, promoting plant growth and enabling to improve the tolerance to stress factors due to mechanisms as secretion of various phytohormones, vitamins and growth regulators, restriction of ethylene synthesis with ACC deaminase activity, decreasing of pathogen damage by the secret of antibiotic and fungicidal compounds. This study was carried out in a laboratory of Field crops in Siirt University under controlled conditions. The 2 original bacterial strains (KF3B and KF63C) and 5 different priming times (control, 1, 2, 4 and 6 h) were applied on the Fırat-87 lentil variety. The study was laid out in a completely randomized design with 3 replications. It was aimed with this study that investigating effects based on bacterial biodiversity and priming time on germination characteristics and seedling growth in lentils. According to results, biodiversity-induced differences were observed in germination percentage, seedling fresh weight, seedling dry weight, seedling length and seedling vigor index while priming time significantly affected all investigated parameters except for germination percentage. However, the interaction of strains and priming times did not lead to any significant differences in traits. In conclusion, microbial diversity and priming time have a critical role on successful of the priming technique. Optimum priming time for lentils was determined as 4 hours. Besides, the strain of KF63C had a noteworthy stimulative effect on especially seedling growth in the experiment.
Leaf Nitrogen, Phosphorous, Carbon Variation, and N and P Resorption in Diospyros kaki L. along an Altitudinal Gradient
Authors: ERBAY Murat , BİLGİN Ali , GÜZEL İZMİRLİ Şule
Published: June 2022

In the present study, nitrogen (N), phosphorus (P), carbon (C) levels and nutrient contents, N and P resorption were investigated in Diospyros kaki L., whose leaves has a strong antioxidant property and is cultivated in the Eastern Black Sea Region. The research was carried out at four different locations where Diospyros kaki was grown within the provincial borders of Trabzon. Leaf samples were taken from these selected locations monthly from May to December. Soil samples were taken from a depth of 0-20 cm from each locality. Soil N, P and C analysis were also determined. There were important differences in N (%) concentration and N (g dm-2) content values in terms of localities. N, P and C (%) concentration values significantly varied among months. Similarly, there were notable differences in N and P (g dm-2) values depending on months. Nitrogen and phosphorus resorption efficiency (RE) values were below stated boundaries at only 796 m. Nitrogen and phosphorus resorption proficiency (RP) values significantly varied between localities.
A New Chemical Method to Predict Grindability Index (HGI) for Limestones
Authors: BİLEN Candan
Published: June 2022

In this study, limestone samples (a total of 58 sample) were investigated in terms of their grindability and chemical composition. Grindability tests were carried out on standard HGI mill. Limestone samples were collected from two different limestone quarry and they were characterized in terms of their chemical composition. In the order of technological utilization, grindability nature of limestones is as significant as their chemical composition. Chemical composition of the limestone samples from the quarries under investigation differs and so does the grinding index, i.e. HGI (Hardgrove Grinding Index). In the context of this study, chemical composition data of limestone samples were correlated with the results of the grinding tests (HGI values). In addition, abovementioned correlations were provided as graphical demonstrations in this context. After these abovementioned graphical demonstration of the relationships between HGI values and chemical composition data, the role of the each chemical composition item in terms of grindability was understood. Based on this understanding, an empirical formula employing the chemical composition data was proposed to predict HGI.
Characterization of Anatolian Bee Breads by Principal Component Analysis Based on Their Physicochemical and Chemical Characteristics
Authors: KALAYCIOĞLU Zeynep
Published: June 2022

Bee bread is a fermented bee product which is the mixture of pollen and honey. This substance is actually the main source of food for honey-bee workers. Due to its rich therapeutic properties, bee bread has gained an increasing interest for human consumption in recent years. The purpose of this study was to compare the physicochemical characteristics and chemical composition of bee bread samples collected from seven different regions in Anatolia. Various measurements such as pH, electrical conductivity, colour, colour intensity, and optical density were performed. Together with the mentioned, the content of moisture, ash, total protein, and free acidity were analyzed. Principal component analysis (PCA) was applied to analyze results in order to classify the bee breads from different regions. This study contributes to the chemical and physicochemical knowledge of this scarcely explored natural bee-product.
Pengaruh Variabel Solvent dan Waktu Leaching terhadap Konsentrasi Emas Terlarut pada PCB Handphone
Authors: Putri Raden Rara Dewi Artanti , Pangestu Dimas , Khairunnisa Diva Candra
Published: June 2022

ABSTRAK

 Perkembangan industri elektronik di Indonesia meningkat, maka begitu juga dengan limbah elektronik yang dihasilkannya. Salah satu bentuk limbah elektronik adalah lempengan PCB (Printed Circuit Board). Logam seperti Au, Ag, dan Cu dapat ditemukan pada PCB, dan logam-logam tersebut dapat dilakukan pemisahan dengan metode leaching. Penelitian ini bertujuan untuk mengetahui pengaruh volume larutan HNO3 sebagai tahapan pre-leaching, perbandingan HCl:HNO3 (aqua regia) dan waktu leaching terhadap konsentrasi emas terlarut. Variasi volume larutan HNO3 (20, 40, 45, 60) mL, variasi perbandingan HCl:HNO3 (3:1, 1:3, 10:1, 1:10) (v/v) dan variasi waktu leaching dengan aqua regia (30, 60, 90, 120) menit. Proses leaching dilakukan pada suhu 70℃. Filtrat hasil leaching dengan aqua regia kemudian dianalisis menggunakan AAS. Hasil penelitian ini memperoleh kondisi optimum leaching logam Au pada volume HNO3 60 mL dengan konsentrasi hasil pelarutan sebesar 26,11 mg/L, perbandingan HCl:HNO3 1:3 (v/v) dengan konsentrasi emas terlarut sebesar 23,77 mg/L dan waktu leaching dengan aqua regia 90 menit dengan konsentrasi logam Au sebesar 26,38 mg/L.

 

ABSTRACT

 The development of the electronics industry in Indonesia is increasing, and so is the electronic waste it produces. One form of electronic waste is PCB (Printed Circuit Board) slabs. Metals such as Au, Ag, and Cu can be found on PCBs, and these metals can be separated by the leaching method.. This study aims to determine the effect of the volume of HNO3 solution as a pre-leaching step, the ratio of HCl: HNO3 (aqua regia), and the leaching time to the dissolved gold concentration. Variations in the volume of HNO3 solution (20, 40, 45, 60) mL, variations in the ratio of HCl:HNO3 (3:1, 1:3, 10:1, 1:10) (v/v) and variations in leaching time with aqua regia ( 30, 60, 90, 120) minutes. The leaching process is carried out at a temperature of 70℃. The filtrate from leaching with aqua regia was then analyzed using AAS. The results of this study obtained the optimum conditions for leaching Au metal at a volume of 60 mL HNO3 with a concentration of 26.11 mg/L, a ratio of HCl: HNO3 1:3 (v/v) with a dissolved gold concentration of 23.77 mg/L and Leaching time with aqua regia was 90 minutes with a concentration of Au metal of 26.38 mg/L.
Pemanfaatan Bioadsorben Dari Sekam Padi Untuk Mendegradasi Logam Cu Pada Minyak Pelumas Bekas
Authors: Pratama Jusuf , Anindya Arlin Dini , Luckita Yurike , Latiefa Nabila Nur , Adhitasari Alfiana
Published: June 2022

Penggunaan minyak pelumas dalam industri sebagai bahan untuk melindungi mesin dari gesekan dengan komponen lain menghasilkan limbah yang sifatnya mudah terbakar dan meledak apabila salah dalam pengelolaan dan pembuangannya, sehingga dapat membahayakan manusia dan lingkungan. Salah satu upaya untuk mengolah minyak pelumas bekas adalah dengan metode asidifikasi-adsorpsi. Metode asidifikasi atau penambahan asam kuat seperti asam sulfat (H2SO4) digunakan untuk menghilangkan pengotor dan mengembalikan beberapa sifat fisik seperti densitas, viskositas dan warna. kemudian untuk menghilangkan kandung logam Cu digunakan metode adsorpsi menggunakan adsorben dari selulosa yang berasal dari sekam padi. Tujuan dari penelitian ini yaitu mengetahui pengaruh penambahan asam sulfat (H2SO4) pada metode asidifikasi, mengetahui pengaruh komposisi massa sekam padi pada metode adsorbsi, serta membandingkan hasil pengujian minyak pelumas bekas sebelum dan setelah diolah ditinjau dari kadar logam berat yang terkandung, viskositas dan Spesific Garivity (SG). Berdasarkan penelitian yang sudah dilakukan penurunan konsentrasi logam Cu tertinggi terjadi pada asidifikasi H2SO4 sebanyak 5% dari volume sampel dengan variasi selusosa-asetat 1:3. Metode asidifikasi-adsorpsi dengan adsorben alami selulosa-kitosan berhasil dilakukan untuk mengubah beberapa sifat fisik dan kadar logam Cu dari minyak pelumas bekas.

 

The use of lubricating oil in industry as a material to protect the machine from friction with other components produces waste that is flammable and explodes if mismanaged and disposed of, so that it can harm humans and the environment. One of the efforts to process used lubricating oil is by acidification-adsorption method. Acidification methods or the addition of strong acids such as sulfuric acid (H2SO4) are used to remove impurities and restore some of the physical properties such as density, viscosity and color. then to remove cu metal bladder used adsorption method using adsorbens from cellulose derived from rice husks The purpose of this study is to find out the effect of sulfuric acid addition (H2SO4) on acidification methods, find out the effect of rice husk mass composition on adsorbtion methods, and compare the results of testing of used lubricant oil before and after processing in view of the levels of heavy metals contained, viscosity and Spesific Garivity (SG). Based on research that has been done the highest reduction in cu metal concentration occurred in the acidification of H2SO4 as much as 5% of the sample volume with a cellulose-acetate variation of 1:3. The acidification-adsorption method with the natural adsorbent cellulose-chitosan was successfully performed to change some of the physical properties and levels of Cu metal from used lubricating oil.
Optimasi Suhu Reaksi Sintesis Senyawa LiFePO4 Menggunakan Prekursor Lithium Sulfat Sebagai Sumber Ion Lithium
Authors: Rispiandi  , Andrijanto Eko
Published: June 2022

ABSTRAK

Dengan meningkatnya kebutuhan akan konsumsi energi, maka semakin meningkat pula kebutuhan akan peralatan  untuk mengkonversi energi dan menyimpannya, seperti baterai lithium. Lithium-ion batteries (LIBs) menjadi salah satu alat yang paling mendapat perhatian karena dianggap memiliki densitas energi yang tinggi. Senyawa LiFePO4 (LIPO) mulai dilirik sebagai alternatif yang paling cocok menggantikan LiCoO2 sebagai katoda pada baterai lihium karena memiliki stabilitas termal yang tinggi.  Pada penelitian ini, dipelajari pengaruh  kondisi reaksi sintesis LiFePO4 menggunakan metode solid state reaction yang dioptimasi dengan memvariasikan  suhu kalsinasi. Bahan baku yang digunakan adalah  Li2SO4. H2O , FeSO4. 4H2O dan NH4PO4 dengan ratio molar 1:1:0,5. Sintesis dengan metode solid state reaction ini dilakukan dengan memvariasikan suhu kalsinasi  600o, 650o dan 700 oC selama 5 jam untuk membentuk fase kristalin  LiFePO4. Difraktogram LiFePO4 hasil sintesis dibandingkan dengan difraktogram standar LiFePO4 - JCPDS 40-1499. Ketiga variasi suhu ini menghasilkan  difraktogram yang sangat identik dengan standar LiFePO4, namun demikian pada suhu 700 oC dianggap menjadi  kondisi yang optimum untuk menghasilkan LiFePO4 dengan tingkat kemiripan yang lebih baik dengan LiFePO4 rujukan atau standar. Li2SO4 adapat dijadikan precursor sumber lithium dalam sintesis material LiFePO4.

ABSTRACT

The increasing for energy consumption, the need for electrical devices to convert energy and store it also increases, such as lithium ion battery.  Lithium-ion batteries (LIBs) have received the wide attention because they are considered to have high energy density. LiFePO4 (LIPO) compounds are starting to be regarded as the most suitable alternative to replace LiCoO2 as a cathode in lithium ion batteries because it has high thermal stability. In this study, the reaction conditions for the synthesis of LiFePO4 utilized the solid state reaction method which was optimized by varying the calcination temperature was examined. The raw material used in this synthesis is Li2SO4. H2O, FeSO4. 4H2O and NH4PO4 with a molar ratio of 1:1:0.5. The synthesis method was carried out at high temperature calcination of 600o, 650o and 700oC for 10 hours to form a crystalline LiFePO4 phase. The synthesized LiFePO4 diffractogram was compared with the diffractogram standard of LiFePO4 - JCPDS 40-1499. These three temperature variations resulted in diffractogram that was very identical to the standard LiFePO4, however at 700oC it was considered to be the optimum condition to produce LiFePO4 with a better similarity to the reference LiFePO4. The Li2SO4 can be utilized as a precursor of ion sources in the synthesis of cathode material LiFePO4.
Contribution of The Tourısm to The Partially or Entirely External Economic Structure Dynamic
Authors: ÖZBAY İsmail
Published: June 2022

Turizm, yakın geçmişte, Türkiye’de, ekonomik ve sosyal kalkınma gelişiminin önemli bir dalı haline gelmiştir. Bu performans, turizmin üretime, istihdama, gelire ve dış ödemeler dengesine sağladığı doğrudan katkılarında olduğu gibi, ekonominin geri kalan kısmına sağladığı dolaylı katkılarında da gözlemlenebilir. Günümüzde, turizm, Türkiye’nin ekonomik kalkınmasının önemli bir faktörü haline gelmiştir. Diğer taraftan, aynı anda, turizm, kısmen veya tamamen ekonomi dışı yapısal dinamiğin üzerinde de sonuçlara sahip olabilir. Gerçekten, turizm endüstrisinin gelişmesi, sosyo-ekonomik ve sosyo-kültürel alanlarda sayısız avantajların ve dezavantajların kaynağı olabilir. Bu çalışmamızda, turizmin, kısmen veya tamamen ekonomi dışı yapısal dinamiğin üzerindeki sonuçlarını önce, sosyo-ekonomik alandaki etkilerinin doğurduğu avantajlarını ve dezavantajlarını ve sonra sosyo-kültürel alandaki etkilerinin doğurduğu avantajlarını ve dezavantajlarını ayrı ayrı inceleyerek birer bilanço oluşturmaya çalışılacaktır.
The Effects of Covid 19 Pandemic to "Events After the Reporting Date": A Content Analysis on Turkish Firms
Authors: ESEN Özgür , SAKIN Turgay
Published: June 2022

The Covid pandemic has had significant effects all over the world, and these effects have been and will be researched in various dimensions. In this study, the effect of the Covid pandemic on financial reporting was assessed and analyzed within the framework of IAS 10 Events After the Reporting Date. In the study, the interim financial statements of the companies included in the BIST 100 index as of 31 March 2020 were examined. 80% of the companies inspected made a statement regarding covid in events after the reporting date or in another footnote. 53 companies that made an after the reporting period event disclosure made statements about the covid pandemic. And only 3 companies made sufficient statement about the effects of the pandemic. In conclusion companies do not make sufficient and quality statements regarding the covid pandemic in their financial reports.
Experiencias en la implantación de un modelo educativo por investigación en una institución de educación superior
Authors: Calva Cavaría Primo Alberto , Pérez Cabrera Gloria M.ª , Gutiérrez Aranzeta Carlos
Published: June 2022

En este artículo se presentan aspectos fundamentales del diseño, puesta en operación y resultados en la implantación de un Modelo Educativo por Investigación en una nueva institución de educación superior en México. El Modelo Educativo establece fundamentos y condiciones para el diseño, operación y evolución de los planes y programas de estudio, así como las bases filosóficas y psicopedagógicas, situando a la investigación en el centro de sus actividades académicas y haciendo de ella la base de la enseñanza. Se muestra como la ausencia de una política nacional de estado, particularmente sobre la educación superior; afecta la implantación del modelo
Hay que enseñar a hacer ensayos
Authors: Alzate Yepes Teresita
Published: June 2022

Llegué muy entusiasmada a trabajar con los estudiantes de octavo semestre de Nutrición y Dietéticaen la asignatura Comunicación, sobre escritura de tipo argumental, y me llevé una primera sorpresa, dijeronhaber hecho ensayos en varias asignaturas y que obtuvieron excelentes calificaciones, en la mayoría decasos. Cuando empecé a recoger sus saberes previos, con el fin de fijar unos mínimos sobre los cualesíbamos a diferenciar los géneros: expositivo, narrativo e informativo del argumental, me encontré con unasegunda sorpresa: los estudiantes llaman ensayo a cualquier escrito en prosa, con una extensión de entretres y diez páginas y una relativa propiedad para abordar un tema...
La integración social a través del empleo y la formación: origen y evolución histórica de la Formación Profesional Ocupacional
Authors: Aznar Díaz Inmaculada , Hinojo Lucena Francisco Javier
Published: June 2022

Presentamos en este artículo una perspectiva histórica de la Formación Profesional Ocupacional, fundamen­ta­da en la satisfacción de las necesidades sociales emergentes que actualmente se encuentran presentes en nuestra sociedad. Una de las necesidades que cubre la formación ocupacional es la integración social de los más necesitados (colectivos en situación de riesgo social, jóvenes desempleados, etc.) desde el ámbito de la formación y el empleo. El recorrido por la evolución histórica de la formación ocupacional nos ayudará a comprender, más de cerca, lo necesaria que ha sido, y es hoy en día, esta formación para dar respuesta a las demandas sociales; es por ello que dentro de las políticas activas de empleo que se desarrollan en nuestro país, nos encontramos objetivos de primera prioridad que hacen precisamente referencia al tema que se plantea en este trabajo.
Tránsito digital en el ámbito educativo
Authors: Caballero Sybil Lorena
Published: June 2022

Este artículo se sustenta en los aportes de la línea de investigación “Tránsito digital, en el ámbito educativo”. En el marco del Centro de Investigaciones Educativas de la Universidad Central de Venezuela: TEBAS, cuyo propósito fundamental es el estudio de la educación y la cultura. El TEBAS se orienta a la promoción de la calidad educativa en Venezuela a través de valores como la dignidad, la solidaridad, la cooperación, la participación, la paz, entre otros.Este trabajo se sustenta en la nueva práctica pedagógica que surge a partir de las transfiguraciones socio-culturales, las cuales develan un cambio significativo en la forma como se concibe la comunicación. Esta última es la base fundamental en los procesos de socialización y, en consecuencia, del hecho educativo, el cual se transfigura gracias a la emergencia de nuevos métodos, herramientas y espacios de transmisión de saberes.En virtud de ello se parte de tres supuestos fundamentales:

Ya no se lee, ni se escribe igual.Ya no se enseña, ni se aprende igual.Un salto ético en la escuela sobre la base de la integración de la escuela a la comunidad y de la emergencia de nuevas socialidades.Complementa la propuesta presentada la Red social: www.redtebas.ning.com y el Blog www.trasitodigital.blogspot.com, donde se difunde esta línea de investigación a través de la actividad docente a nivel de postgrado, bajo la modalidad de b-learning integrando a otros docentes en la producción de conocimiento y en su formación sobre el uso de ambientes colaborativos en red, y producción de contenidos digitales bajo distintos medios (wiki, blogs, páginas web, videos, podcast) bajo el lema aprender haciendo.
O contexto científico-tecnológico e social acerca de uma abordagem crítico-reflexiva: perspectiva e enfoque
Authors: Maciel Pinheiro Nilcéia Aparecida , Monteiro Castilho Foggiatto Silveira Rosemari , Bazzo Walter Antonio
Published: June 2022

Esse artigo tem como propósito apresentar algumas reflexões sobre ciência-tecnologia-sociedade e suas relações, procurando mostrar como a educação pode contribuir para esse debate. Inicialmente expomos que na visão positivista a ciência e a tecnologia são consideradas como alavancas para o progresso e desenvolvimento humano sem que se considerem suas implicações sociais. Evidenciamos que o uso de novas tecnologias são impulsionadas por interesses políticos, econômicos e militares, o que implica riscos para a sociedade contemporânea. Existe a necessidade de a população alcançar, além do acesso às informações sobre o desenvolvimento cientifico-tecnológico, também as condições de avaliar e participar de decisões que venham a atingir o meio onde vive. Todavia, para que a sociedade possa se tornar efetiva nessas discussões é necessário que tenhamos uma formação que compreenda o funcionamento da tecnociência. Nesse contexto, ressaltamos que algumas atitudes já começaram a ser tomadas. Uma delas vem se evidenciando em vários setores da sociedade, especialmente na área educacional, por meio da abordagem CTS, a qual se apresenta como uma forma de postura que pode ser assumida pelos educadores, indo muito além do academicismo e cientificismo, ao se preocupar com os problemas sociais relacionados com o contexto cientifico-tecnológico.
Formación de los docentes y la promoción de innovaciones educativas Una experiencia B-learning en el curso "La educación bolivariana"
Authors: López Marisol
Published: June 2022

El curso la educación bolivariana tuvo como propósito contribuir a la formación permanente de los docentes para fortalecer su práctica pedagógica, según políticas educativas del MPPE (Ministerio del Poder Popular para la Educación) en la construcción del Currículo Nacional Bolivariano (2007). La experiencia B-learning se realizó en el CEI "JA Román Valecillos" con el uso de TIC: http://www.gapsipe.org/virtual/course/ view.php?id=197, curso: innovaciones educativas en educación bolivariana y http://www. innovacionespedagogicas.com.ve. Se logró formar integralmente a 47 docentes según las necesidades y potencialidades educativas diagnosticadas con la aplicación de instrumentos: entrevistas y cuestionarios, asesorías, visitas de acompañamiento pedagógico y equipos interdisciplinarios e interinstitucionales para promover la consolidación de innovaciones educativas en la práctica pedagógica.
Determinación de los contenidos básicos de matemáticas en educación infantil y desarrollo de una prueba de evaluación criterial
Authors: Vicent Catalá Consuelo , Gil Llario M.ª Dolores
Published: June 2022

El objetivo de este estudio es elaborar y validar una prueba criterial de la competencia matemática del segundo ciclo de Educación Infantil. En la elaboración de una prueba de evaluación de las competencias básicas referida a un criterio se han de seguir una serie de fases, a saber, la especificación del dominio educativo, el análisis de los ítems, la determinación de estándares y puntos de corte y la comprobación de la fiabilidad y validez (Rivas, 1997). En este trabajo se han desarrollado dichas fases para la elaboración de la prueba de evaluación criterial.El procedimiento seguido para determinar las prescripciones generales de los contenidos matemáticos ha sido el sistema de consenso entre jueces expertos. Un grupo de 8 maestros en activo, con una experiencia de al menos 5 años en educación infantil, elaboró un documento definitivo con los objetivos y análisis de los ítems. Después se estableció el punto de corte y se analizó la fiabilidad y la validez del instrumento. En los resultados hemos podido comprobar la efectividad de la prueba
Indicaciones para el logro de competencias geométricas con una visión holística del Algebra Lineal y la Geometría Analítica en los estudiantes de Arquitectura y de Ingeniería de la Universidad de Camagüey
Authors: Rodríguez María Lourdes , Yordi Isabel , Mola Reyes Cila , Sampedro Reinaldo
Published: June 2022

El presente trabajo se propuso contribuir a la solución de la problemática referente a las dificultades que presentan en el proceso enseñanza aprendizaje de la Matemática los estudiantes de Arquitectura y de Ingeniería en la adquisición de las competencias geométricas. Su objetivo es ofrecer un grupo de indicaciones metodológicas que permita perfeccionar el proceso de enseñanza aprendizaje de la Matemática y la formación de habilidades y capacidades específicas en las carreras antes mencionadas. Por su importancia, estas indicaciones metodológicas para el profesor se sustentan en la utilización, en el proceso de enseñanza aprendizaje, de las TIC, el modelo de Van Hiele y la teoría para la formación y desarrollo de las habilidades geométricas.
Influencia del aprendizaje cooperativo en educación física
Authors: Prieto Saborit José A. , Nistal Hernández Paloma
Published: June 2022

El aprendizaje cooperativo se ha presentado continuamente como una alternativa a los métodos de enseñanza tradicional. En nuestro estudio hemos analizado una muestra de alumnos de1º ESO, que se dividieron en dos grupos (control y experimental). El objetivo principal se basaba en evaluar la influencia de la metodología cooperativa en factores tan decisivos en estas edades como el social-afectivo, el motriz o físico y el motivacional. Se utilizó un cuestionario de 21 ítems que recogía cuestiones sobre las variables señaladas, además se para la obtención de los datos físico-motrices se utilizaron pruebas validadas de resistencia, fuerza, velocidad y flexibilidad con unos baremos preestablecidos. Tanto el cuestionario como los test físicos se realizaron al comienzo y al final del curso académico 07-08. Los resultados muestran un incremento significativo en el ámbito social y motivacional del grupo experimental. Los dos grupos mejoran sus resultados físico-motrices después del periodo de intervención, destacando en los alumnos que en el test inicial habían presentado valores más bajos y posteriormente utilizaron la metodología cooperativa. Se demuestra por tanto que el aprendizaje cooperativo es una metodología que influye positivamente en aspectos como las relaciones sociales, la responsabilidad, la motivación y las capacidades físicas.