bluuebunny/crossref_metadata_2025 huggingface dataset:
Revealing Students Attitudes (Views and Assessments) on Drug Use in Vocational High Schools in Padang
Authors: Izzati Rahmi , Firman Firman , Kiram Yanuar
Published: December 2021

Drug abuse one of the problems that have swept the world and become a frightening problem for the society and Indonesian. Students become one of the targets of drug abuse. Drug abuse occurs during adolescence because adolescents have rapid biological, psychological, and social changes that cause vulnerable individuals to get involved in drug abuse. The cause of drug abuse among adolescents was due to the low attitude of students in addressing the occurrence of drug abuse. The population of this research was the students of SMK in Padang. There were 124 students as the sample of this research. The sampling technique used was a purposive random sampling and the data collection tools used student` attitude instruments used students' attitude instruments in drug abuse with a Likert scale model, with Alpha Cronbach reliability of r=0,991. The data were analyzed by using the descriptive statistical methods with the data processing using SPSS version 22. The results revealed that the students’ attitudes in drug abuse were in the middle category (54.2%). Clearly, the affective component was in the middle category (2.69%); the behavioral component was in the middle category (2.91%); the cognitive component was in the low category (2.47%).
Social Cohesion of Padang City Vocational School Students
Authors: Wahidah Syarifah , Firman Firman
Published: December 2021

Brawls among students in various regions of Indonesia are still often the main topic in various media. Even though student brawls are not new in Indonesia, in recent years, the community has felt uneasy because brawls increasingly threaten a sense of security in the community. When explored further, a lack of student social cohesion causes student brawl. This study aims to provide an overview of the social cohesion of vocational students in Padang. This research is a descriptive study with a quantitative approach using a data collection instrument in the form of a social cohesion questionnaire with a validity greater than 0,404 and a reliability of 0,936. The subjects of this study were vocational high school students in Padang. The subjects were chosen by simple random sampling technique. This study applied data analysis with descriptive analysis. The results of this study indicate that the students' social cohesion consists of various dimensions. Each dimension has a different percentage. Dimension Inclusion has the lowest percentage that is 10%, dimension Participation as a percentage of 23%, dimension Recognition and Appreciation has a percentage of 25%, and dimension Sense of Belonging has the highest percentage, which is 42%.
Student Consumptive Lifestyle and Its Implications in Guidance and Counseling
Authors: Azhari Rahmi , Nirwana Herman , Iswari Mega
Published: December 2021

This study aims to analyze how the form of student's consumptive lifestyle, the factors that cause it, and the negative impact of the student's consumptive lifestyle. This research uses descriptive qualitative method with case study research type. The research subjects were 2 people within the scope of UIN Suska Riau students, using data collection techniques, namely in-depth interviews, observation and documentation. The data analysis technique used by researchers was guided by the Miles & Huberman model. The results showed that the form of a consumptive lifestyle that was seen in the research subjects was excessive shopping and buying goods that did not suit their needs. The contributing factors are shopping because of discounts, likes to be admired by others, and environmental factors. As well as the negative impact of a consumptive lifestyle that occurs on the subject of the study are: low budget economy, likes to lie, becomes a person who likes to be in debt, and is negligent in doing college assignments
Self-Disclosure of Students with Minangkabau and Batak Cultural Backgrounds
Authors: Ayuni Tati , Nirwana Herman , Netrawati Netrawati
Published: December 2021

The expression is derived from the Minangkabau and Batak Toba cultures. This study aims to describe the self-disclosure of high school students in terms of Minangkabau and Batak Toba culture. The sample used in this study were 329 high school students consisting of 165 students with a Minangkabau cultural background and 164 students with a Toba Batak culture background. This research uses Proportional Random Sampling technique. The instrument used in this study was a system Self Disclosure Skala with a reliability of 0.91029. The data analysis used in this research is ANOVA (Analysis Of Variants). there is no difference in the self-disclosure of students with Minangkabau cultural backgrounds between men and women. There is no difference in the self-disclosure of students with Batak cultural backgrounds between boys and girls.There are differences in the self-disclosure of students with Minangkabau and Batak cultural backgrounds in terms of male gender. There are differences in students' self-disclosure with Minangkabau and Batak cultural backgrounds which are reviewed based on the gender of the women.
Contribution of Academic Self-Concept and Parental Social Support to Learning motivation
Authors: Ummi Ayunil , Marsidin Sufyarma , Mudjiran Mudjiran
Published: December 2021

Contribution of academic self-concept and parental social support to learning motivation. This research is motivated by the low student motivation. Academic self-concept and parental social support are thought to have an effect on student motivation. This study aims to describe: (1) academic self-concept, (2) parental social support, (3) student learning motivation, (4) Contribution of academic self-concept to student learning motivation, (5) contribution of parental social support to student learning motivation , and (6) the contribution of academic self-concept and parents' social support together on learning motivation. This research uses a descriptive correlational quantitative method. The study population was students of class X and XI at SMKN 6 Padang, totaling 983 students, a sample of 284 students, who were selected by using cluster random sampling technique. The results of this study indicate that academic self-concept and parental social support together have a significant effect on learning motivation at SMKN 6 Padang by 64.5%. The implications of the results of this study can be used as a needs analysis in making Guidance and Counseling service programs at SMKN 6 Padang.
Factors Affecting Student Learning Motivation During the Covid-19 Pandemic
Authors: Hanesty Ebnovrio , Neviyarni Neviyarni , Karneli Yeni
Published: December 2021

The last few years have been the most difficult due to Covid-19, a disease that attacks and is transmitted through the human respiratory tract, sweeping the world. As a result, a number of public facilities were closed including schools so that the distance learning model was applied. The condition of the Covid-19 pandemic has made it possible to decrease student learning motivation which is the key to student learning success. Thus, it is important to study the factors that affect student learning motivation. This study aims to describe student learning motivation in terms of self-concept support, parental support, subject teachers, guidance and counseling teachers and smartphone facility factors. This type of research is descriptive using quantative methods. The population of this study were students of MTsN 2 Pesisir Selatan, totaling 711 students, with a sample of 256 students who were taken using a proportional stratified random sampling technique. The results of the study found that in general the learning motivation of MTsN 2 Pesisir Selatan students during the Covid-19 pandemic was in the moderate category, which means that most students lost their motivation to learn.
Reinforcement Level: An Analysis Teacher in Junior High School Teacher
Authors: Maulidia Citra , Nirwana Herman , Marlina Marlina
Published: December 2021

The implementation of the learning process cannot be separated from the existence of the teacher. The creation of an effective learning atmosphere requires a close relationship between teachers and students. The reinforcement given by the teacher affects the level of student activity and participation in the learning process. In schools, there are still teachers who are not appropriate to implement reinforcement. This can be seen in the poorly educated treatment of teachers towards students, such as yelling at students in public, and negative labeling of students.The purpose of this study was to describe the level of reinforcement of subject teachers in Padang City Junior High School. This research uses a quantitative descriptive approach. The research sample consisted of 149 students who were taken using the purposive random sampling technique. The instrument used was the "Teacher Reinforcement Scale" with a reliability value of 0.714. The results of this study reveal that the reinforcement of subject teachers in schools is in a low category. The results of the study generally show that the reinforcement of subject teachers is in a low category and needs to be improved in order to encourage students to be more active in participating in the learning process. The results of this research can be used as a basis for school counselors or Guidance and Counseling teachers in providing guidance and counseling services in schools by involving subject teachers.
Enhanced Self-Control for the Prevention of Pornography of Student in Senior High School
Authors: Hafizh Ahsanul , Firman Firman , Netrawati Netrawati
Published: December 2021

The lack of students' self-control led to the emergence of pornography. The phenomenon of pornography is a general term that refers to sexually explicit material that may be softcore or hardcore and can also be referred to as things that attempt to stimulate and increase sex drive with text and images. Self-control is the ability to organize, guide, regulate, and direct forms of behavior that can lead to positive consequences. The purpose of this study was to describe students' self-control at SMA N 1 Merbau. This research uses descriptive analysis. The research sample consisted of 128 students who were taken using purposive sampling technique. The instrument used was "Self-control scale in preventing pornography" with a reliability value of (0.888). The results showed that: most of the students as many as (65.6%) of the students had "moderate" self-control in the prevention of pornography, then a small proportion of students (2.3%) of students had "low self-control". "In the prevention of pornography. Furthermore, as many as (5.5%) students had “very high” self-control in preventing pornography and as many as (26.6%) students had “high” self-control in preventing pornography. The results of the study generally showed that students' self-control was in the medium category with a percentage of 65.6% and it needed to be improved in order to prevent pornography. The results of this research can be used as a basis for counseling teachers in providing guidance and counseling services to prevent student pornographic behavior in schools.
Increasing student identity in preventing student aggressive behavior
Authors: Zera Arga Dian , Firman Firman , Kiram Yanuar
Published: December 2021

The low self-identity of students causes aggressive behavior. The phenomenon of aggressive behavior is the act of attacking others directly or indirectly to hurt others both physically and psychologically. Aggressiveness among adolescents is increasing from year to year, based on data released by the Central Statistics Agency, in 2007 it was recorded that 3145 adolescents aged ? 18 years of age became criminals and continued to increase to 3280 in 2007, and 4123 in 2008. Self-identity is one of the factors that influence the emergence of aggressive behavior. The purpose of this study is to describe the self-identity of students at SMK Muhammadiyah 1 Padang City. This research uses descriptive analysis. The sample of this study was 114 students who were taken using purposive sampling technique. The instrument used was "Self-identity scale in preventing aggressiveness" with a reliability value of 0.881. The results showed that: (1) the aspect of Identity diffusion was in the medium category with a percentage of 67%; (2) Identity foreclosure aspects are in the medium category with a percentage of 39%; (3) the Identity aspect of the moratorium is in the low category with a percentage of 45%; and (4) Identity achievement is in the low category with a percentage of 41.2%. The results of the study generally show that the students' self-identity is in the medium category with a percentage of 71.1% and it needs to be improved in order to prevent aggressive behavior.
The contribution of self determination and peer conformity to sexual harassment
Authors: Sari Weni Puspita , Firman Firman
Published: December 2021

This research is motivated by the rise of cases of sexual harassment that occur among teenagers. Sexual harassment by teenagers occurs in verbal, visual, and physical forms such as: sexual jokes, flirting and touching someone's sensitive area. Factors that influence adolescents to commit sexual harassment are due to peer group involvement and the inability of adolescents to make choices in actions that are reflected in peer conformity and self-determination. The aims of this study is to examine the contribution of self-determination to sexual harassment, to examine the contribution of peer conformity to sexual harassment, and to examine the contribution of self-determination and peer conformity together with sexual harassment. This research uses quantitative method with simple and multiple regression analysis. The study population is all students high school city of Padang who are active in 2020/2021. The number of samples in this study were 273 teenagers who were selected by cluster random sampling technique using the Slovin formula. Methods of data collection using self-determination scale, peer conformity scale, and sexual harassment scale with a Likert Scale model to then be tested for validity and reliability. The research findings show that: (1) there is a significant negative contribution between self-determination with sexual harassment shown by correlation coefficient of R= 0.736 and R Square of 0.542, which means that the contribution of self-determination to sexual harassment is 54.2%. (2) there is a significant positive contribution between peer conformity to sexual harassment shown by correlation coefficient of R = 0.767 and R Square of 0.588, which means that the contribution of peer conformity to sexual harassment is 58.8%. (3) there is a significant contribution between self-determination and peer conformity together to sexual harassment shown by correlation coefficient of R =  0.810 and R Square of 0.665, which means that the contribution of peer conformity to sexual harassment is 68.5%.
Effectiveness of group guidance using Expressive Arts Therapy in improving self management of sexual harassment among vocational high school students in city of Pinang
Authors: Rismaniar Rismaniar , Firman Firman
Published: December 2021

The case of sexual harassment are more and more extends, spread, and found a lot in several areas, the city, even among all these villages not only the community but also in the world of education in indonesia. Sexual harassment case it is becoming even diverse and no longer eat his victims who are in the age range of adult , but those who are in the age range of teenagers even children very much a victim or an offender sexual harassment. Sexual harassment that occured in schools happened because of incompetence students in regulating and manage himself with good. One of the efforts was to enhance the capacity of students in regulating and manage himself in do sexual harassment is to hold guidance services use the art of expressive of group. The sample as many as 13 students for the experiments on class, X, XI  and 13, students to the control group the sample used are proportionate stratified random sampling. Statistical analysis of data used in this research are nonparametrik statistics. Instruments gather data using the model scale likert, data analyzed using wilcoxon signed ranks kolmogorov-smirnov test and with the help of two independent sampels spss 20. Version. The findings of this study are: 1) there is a significant differences self management group experiment before and after given guidance services group use an expressive art therapy, 2) there is a significant differences self management control group before and after the guidance given services without special treatment, 3) there is a differences self management group experiment given guidance services group use an expressive art therapy to the control group given guidance services group about self management without special treatment , this was apparent from the score average postest group experiment rise higher than the average posttest score control group.
Enhancing Wireless Sensor Networks Routing Protocols based on Cross Layer Interaction
Authors: Ismail Reem J. , Jasim Khalid F. , Ismael Samar J. , Solaimanzadeh Soma A. M.
Published: December 2021

Wireless sensor networks aim to develop a smart city based on sensing environment. The routing protocols of wireless sensor networks is important to transfer the data in smart cities since sensor nodes have limited power and transmission range. The aim of this research is to enhance wireless sensor networks routing protocols based on proposed cross-layer interaction between physical layer and network layer also a proposed routing table information of wireless sensor nodes is developed to consider the transmission power of neighbor’s nodes to determine the next hop. Cross-layer interaction provides a useful information and effective adaptation for WSN routing protocols. As a result, the proposed routing protocol shows an improvement in network performance when number of intermediate nodes are minimized.
EFEKTIFITAS PENGGUNAAN MODEL PEMBELAJARAN BERBASIS PRODUK TERHADAP PENINGKATAN MINAT WIRAUSAHA MAHASISWA
Authors: Dewy Mega Silfia , Isnaini Muhammad
Published: December 2021

AbstrakPenelitian ini bertujuan untuk mendesktripsikan dan mengevaluasi efektivitas dari penerapan model pembelejaran bebasis produk untuk meningkatkan minat wirausaha mahasiswa. Dalam penerapan pembelajaran berbasis produk, mahasiswa diharapkan dapat meningkatkan keaktifannya, sehingga proses pembelajaran yang diikuti menjadi lebih bermakna. Melalui pembelajaran berbasis produk ini mahasiswa difasilitasi untuk mengembangkan minat wirausahanya dengan merencankan peluang-peluang usaha yang bisa dikembangkan dari produk yang dihasilkan dalam pembelajaran. Tujuan akhir pembelajaran dengan menerapakan model pembelajaran berbasis produk adalah menghasilkan mahasiswa yang aktif serta kreatif dalam proses pembelajaran sehingga dapat menghasilkan sebuah produk yang memiliki nilai jual sehingga bisa menciptakan peluang usaha. Penelitian ini menggunakan metode desktiptif kualitatif. Teknik pengumpulan data yang digunakan adalah melalui wawancara, observasi langsung, dokumentasi dan kuisioner. Hasil penelitian menunjukkan penerapan model pembelajaran berbasis produk efektif dalam meningkatkan minat wirausaha mahasiswa dengan terus menciptakan peluang berwirausaha melalui pembelajaran. Kata Kunci: Model Pembelajaran, Model Pembelajaran Berbasis Produk, Minat Wirausaha AbstractThis study aims to describe and evaluate the effectiveness of the application of product-based learning models to increase student entrepreneurial interest. In the application of product-based learning, students are expected to increase their activeness, so that the learning process that is followed becomes more meaningful. Through product-based learning, students are facilitated to develop their entrepreneurial interests by planning business opportunities that can be developed from the products produced in learning. The ultimate goal of learning by applying a product-based learning model is to produce students who are active and creative in the learning process so that they can produce a product that has a selling value so that it can create business opportunities. This study uses a qualitative descriptive method. Data collection techniques used are through interviews, direct observation, documentation and questionnaires. The results showed that the application of product-based learning models was effective in increasing student entrepreneurial interest by continuing to create entrepreneurial opportunities through learning.  Keywords: Learning Model, Product Based Learning Model, Entrepreneurial Interest
Biodegradable plastic modification from durian seed starch and shrimp chitosan with the addition of plasticiziers glycerol and polyglycerol using microwaves
Authors:   Department of Chemistry, Universitas Negeri Medan, Medan 20221, Indonesia, Salomo Saud , Pakpahan Astri Devi Br ,   Department of Chemistry, Universitas Negeri Medan, Medan 20221, Indonesia, Siagian Dea Gracella ,   Department of Chemistry, Universitas Negeri Medan, Medan 20221, Indonesia, Tampubolon Grecy Kristina ,   Department of Physics, Universitas Negeri Medan, Medan 20221, Indonesia, Afani Salsabila ,   Department of Physics, Universitas Negeri Medan, Medan 20221, Indonesia, Eddiyanto Eddiyanto ,   Department of Chemistry, Universitas Negeri Medan, Medan 20221, Indonesia, Sihombing Junifa Layla ,   Department of Chemistry, Universitas Negeri Medan, Medan 20221, Indonesia
Published: December 2021

Plastic waste takes up to 450 years to decompose. These problems can be overcome by creating other alternatives, one of which is by using biodegradable plastic. Biodegradable plastics are plastics made from natural polymers that are easily degraded by microorganisms. This study aims to examine the effect of the amount of plasticizer on the length of the degradation process and the effect of using microwaves on the length of time for molding biodegradable plastic. This biodegradable plastic is made by combining durian seed starch, shrimp chitosan and plasticizers in the form of glycerol and polyglycerol with volume variations of 1 mL, 2 mL, 3 mL, 4 mL, and 5 mL. This polymerization was carried out using a microwave with a power of 100 watts for 60 minutes. The resulting biodegradable plastics were characterized using the FTIR test, the Mechanical Properties test, the Absorbency test, and the Biodegradation test to determine the quality of the biodegradable plastic. The results of this study indicate the greatest tensile strength value is 1.9768 MPa, the largest elongation value is 21.2772%, the smallest water absorption is 45.40% for 5 minutes, and the largest degraded mass is 0.908 grams for 7 days. Based on this research, it can be concluded that the use of polyglycerol can accelerate the plastic degradation process. In addition, the use of microwaves can speed up the molding time of biodegradable plastics.
Methanol extract from kesambi (Schleichera oleosa (L.) oken) stem bark as a natural antioxidant to increase crude palm oil (CPO) quality
Authors:   Department of Chemistry, Faculty of Mathematic and Natural Science, Gorontalo Sate University, Gorontalo, Indonesia, Musa Weny J A , Bialangi Nurhayati ,   Department of Chemistry, Faculty of Mathematic and Natural Science, Gorontalo Sate University, Gorontalo, Indonesia, Kurniawan Diky ,   Department of Chemistry, Sekolah Tinggi Analis Kimia Cilegon, Cilegon, Indonesia, Sunardi M Amrin ,   Department of Chemistry, Sekolah Tinggi Analis Kimia Cilegon, Cilegon, Indonesia, susparini Ninik Triayu ,   Department of Chemistry, Sekolah Tinggi Analis Kimia Cilegon, Cilegon, Indonesia, Sriwijayanti Sriwijayanti ,   Department of Chemistry, Sekolah Tinggi Analis Kimia Cilegon, Cilegon, Indonesia, Situmeang Boima ,   Department of Chemistry, Sekolah Tinggi Analis Kimia Cilegon, Cilegon, Indonesia
Published: December 2021

The content of active compounds in methanol extract of kesambi stem bark (Scheleicera oleosa) is known to have good antioxidant activity. Methanol extract of kesambi stem bark contain flavonoid and fenolic compounds. The purpose of this study was to evaluate the methanol extract of kesambi in inhibiting the oxidation of crude palm oil (CPO). In this study, the extraction of kesambi stem bark was carried out with methanol solvent. Antioxidant activity test of methanol extract of kesambi using the DPPH method. The parameters observed were free fatty acids (FFA) values, acids value, and DOBI (Deterioration of Bleachability Index). The used concentration of natural antioxidant were 200; 400; 600; 800 and 1000 ppm. Based on the results of this study, the natural antioxidant of methanol extract of Kesambi stem bark (Schleichera oleosa) can reduce levels of free fatty acid numbers, acid value, and DOBI value. Actioxidant activity methanol extract of kesambi stem bark shown IC50 42.092 ppm. The lowest FFA levels and acid numbers were obtained from samples with addition of 1000 ppm natural antioxidants with free fatty acid (4.1%), acid value (7.7 mg KOH/g) while the DOBI value increased to 1.331. Furthermore, FFA value meets the CPO quality standard, according to SNI-01-2901-2006.
Students’ learning outcomes on hydrocarbon materials through mind mapping method
Authors:   Department of Chemistry Education, Faculty of Teacher Training and Education, Universitas Kristen Indonesia, Jakarta, Indonesia, Andriani Andriani , Harefa Nelius ,   Department of Chemistry Education, Faculty of Teacher Training and Education, Universitas Kristen Indonesia, Jakarta, Indonesia, Sormin Elferida ,   Department of Chemistry Education, Faculty of Teacher Training and Education, Universitas Kristen Indonesia, Jakarta, Indonesia, Azzah St Fatimah ,   Department of Chemistry Education, Faculty of Teacher Training and Education, Universitas Kristen Indonesia, Jakarta, Indonesia
Published: December 2021

The purpose of this study was to determine the effect of the Mind Mapping learning method on student learning outcomes in class XI MIPA SMAN 1 Siberut Tengah on hydrocarbon material. The research sample amounted to 28 students, who were selected using the Purpose Sampling technique. The instrument used was a test instrument for chemistry learning outcomes, in the form of pretest and posttest which were analyzed using SPSS 22 for window to determine the results of the T-test on the Independent Sample Test. Normality test using Shapiro-Wilk test on sig. > 0.05 that is equal to 0.034. The results of hypothesis testing using the Independent Sample Test which shows that the value of sig. (2-tailed) 0.000 < 0.05, which means Ha is accepted. Thus, it is concluded that there is an effect of using Mind Mapping to improve student chemistry learning outcomes.
The effectiveness of the four-step jigsaw and jigsaw learning model in improving students' argumentation skills about salt hydrolysis concept
Authors:   Chemistry Education Study Program, Postgraduate, Jambi University, Jambi 36361, Indonesia, Kartika Windy , Asrial Asrial ,   Department of Chemistry Education, Jambi University, Jambi 36361, Indonesia, Effendi-Hasibuan Muhammad Haris ,   Department of Chemistry Education, Jambi University, Jambi 36361, Indonesia
Published: December 2021

One of the learning models that can train students in developing argumentation skills is the jigsaw learning and its modified forms. This study aimed to see the effectiveness of the four-step jigsaw learning and the Jigsaw learning in improving students' argumentation skills about the concept of salt hydrolysis. This study was conducted with 2 classes of 11 grade students of SMAN 7 Kerinci Jambi. Some 53 students in total were purposively recruited and participated in this experiment. Concurrent embedded mixed method with two-group pretest-posttest control group design was used in this study. The results of independent t-test showed that 4SJ was more effective than the Jigsaw class (t= 2.668; p-value = 0.01 < 0.05). It was supported by the n-Gain of 4SJ which was 0.71 and the n-Gain of jigsaw was 0.67. Two factors that influenced the differences in students' argumentation skills were observed; these included the difference in learning duration and the intensiveness in conducting the argumentation debate.
PENGARUH PENERAPAN PEMBELAJARAN ONLINE TERHADAP HASIL BELAJAR MELALUI MINAT BELAJAR PADA MATA PELAJARAN MARKETING KELAS X (SEPULUH) KOMPETENSI DASAR 3.9 DI SMK KETINTANG SURABAYA
Authors: Septorini Hervina Dwi , Harti Harti
Published: December 2021

The research was conducted to determine whether online learning affects learning outcomes through learning interest in marketing subjects for class X KD. 3.9 about analyzing the product life cycle at SMK Ketintang Surabaya. The sample is the tenth grade students of SMK Ketintang Surabaya, the online business and marketing expertise program, totaling 68 students. This research is a type of quantitative research. Collecting data using a closed Likert scale questionnaire. Data were analyzed by path analysis technique. The results of the study explain that online learning has a significant influence on learning interest by 21,6%, learning interest has a significant influence on learning outcomes by 39%, online learning has a direct influence on learning outcomes by 39%, and online learning on learning outcomes through interest in learning does not have a significant effect because the direct influence value is greater than the indirect influence value, namely 45,6% > 10,5%. It is hoped that this research will provide benefits for a teacher to know what can affect student learning outcomes.
The Perception of Thermal Comfort in Malaysia Public Low-Cost Housing
Authors: Yong Kelvin , Abdullah Zunaibi , Che Din Nazli
Published: December 2021

In Malaysia, the thermal comfort of low-cost high-rise housing has not been widely given a significant emphasis in the qualitative study despite its increasing scale and significance in the urban areas. Occupant’s perception and adaptive behaviour are important to achieve the level of satisfaction in terms of a comfortable living environment. This paper assesses the occupants’ perception and behaviour in a low-cost high-rise housing development that has been argued with various problems which have a considerable impact on lifestyle. Understanding of comfort as social and cultural behaviour, rather than an engineering approach. This research shows the results of a pilot study that utilized a qualitative strategy for analysing thermal comfort, rather than using the standard thermal comfort research methodologies. The building of study, in the category of low-cost high rise residential located at the urban context of Kuala Lumpur housing area, which is mainly natural ventilated with a versatile adaptive possibility available for the occupants. The outcomes signify the adaptive behaviour that enhances or limit the thermal comfort-related varieties. The results from the pilot study direct for more extensive research and comparison with previous qualitative studies.

Keywords: Thermal comfort, Qualitative study, Occupant perception, Adaptive behaviour, Housing
Ligaza γ-glutamylocysteiny – od molekularnych mechanizmów regulacji aktywności enzymatycznej do implikacji terapeutycznych
Authors: Gabryel Bożena , Bontor Klaudia
Published: December 2021

Abstrakt

Glutation (γ-glutamylocysteinyloglicyna, GSH) jest najbardziej rozpowszechnionym tiolowym antyoksydantem wytwarzanym w cytozolu wszystkich komórek ssaków, który pełni ważną rolę ochronną przed stresem oksydacyjnym. GSH jest syntetyzowany de novo przez sekwencyjne działanie dwóch enzymów: ligazy γ-glutamylocysteiny (GCL) i syntetazy glutationowej (GS). GCL katalizuje pierwszy etap biosyntezy GSH, którego produktem jest γ-glutamylocysteina (γ-GC). GCL jest heterodimerycznym enzymem zbudowanym z podjednostki katalitycznej (GCLc) i modulatorowej (GCLm), kodowanych przez dwa różne geny. Podjednostki GCL podlegają złożonej regulacji zarówno na poziomie przed-, jak i potranslacyjnym. Zmiany w ekspresji i aktywności GCL mogą zaburzać poziom GSH i homeostazy redoks. Przyczyną wielu przewlekłych schorzeń związanych ze stresem oksydacyjnym jest upośledzenie aktywności katalitycznej GCL oraz spadek stężenia GSH. Badania przedkliniczne sugerują, że podawanie egzogennej γ-GC podwyższa wewnątrzkomórkowe GSH przez dostarczenie brakującego substratu i może wykazywać potencjał jako terapia uzupełniająca w chorobach związanych z deplecją GSH.
The combination of brush cytology with the results of histopathological examination in laryngeal cancer diagnosis
Authors: Lepka Paulina , Hałoń Agnieszka , Barnaś Szczepan , Zatoński Tomasz
Published: December 2021

Recently, the incidence rate of head and neck cancer (HNC) has been increasing significantly. It is estimated that there are over 550,000 new cases per year, of which over 130,000 are laryngeal cancers. It is assumed that in more than 60% of patients the disease is diagnosed late, at stages III–IV, which is associated with unfavorable prognoses: the average survival ranges from 15% to 45%. The mainstay of successful tumor therapy is the early detection of neoplastic tissue. The laryngological examination with the use of traditional instruments should be expanded with an endoscopic examination of the larynx using optics in the outpatient clinics. This procedure is sufficient to select patients who need a direct laryngoscopy with a surgical biopsy, usually under general anesthesia in operating room conditions. However, it may bear potential complications. In 1941, Papanicolaou and Traut showed that brush cytology could be useful in detecting precancerous conditions and cervical cancers. For decades, research on the usefulness of brush cytology in diagnosing precancerous conditions and laryngeal cancers has been conducted. This paper aims to enable the reader to understand the issues related to laryngeal cancer and present the results of the previous use of brush cytology in the diagnostic process.
Arylesterase activity of paraoxonase 1 in patients with primary hypertension
Authors: Baszczuk Aleksandra , Wysocka Ewa , Płóciniczak Alicja , Thielemann Anna , Dżumak Anna , Hoffmann Karolina , Michalak Sławomir , Bryl Wiesław
Published: December 2021

Introduction

Paraoxonase 1 is an enzyme associated with high-density lipoprotein fraction and is considered to present antioxidant activity.

Objectives

The aim of the study was to assess the arylesterase activity of paraoxonase 1 (PON1) in the serum of patients with hypertension, due to effect of therapy and before treatment. Patients and Methods. The study was conducted in 76 patients with primary hypertension and 28 volunteers for the control group. Hypertensive subjects were assigned to one of three groups: well controlled (n=25), poorly controlled (n=26), and newly diagnosed before therapy (n=25) hypertension. We evaluated metabolic parameters in all participants using routine laboratory methods, as well as arylesterase activity of PON1.

Results

The four study groups differed with arylesterase activity of PON1 and the highest levels were found in patients with well controlled hypertension and the lowest in newly diagnosed. All patients diagnosed with hypertension presented negative correlations between PON1 and systolic and diastolic blood pressure.

Conclusions

Effective treatment of hypertension could result in increased PON1 activity, despite unfavorable homocysteine concentrations in blood. Untreated hypertension might decrease activity of PON.
Spruce and Barley Elemental and Stochiometric Analysis Affected by the Impact of Pellet Production and Torrefaction
Authors: Jeníček Lukáš , Neškudla Michal , Malaťák Jan , Velebil Jan , Passian Luboš
Published: December 2021

Biomass is a potential biofuel which may help fighting high carbon dioxide emissions and negative impacts of global warming. Analysis of Norway spruce (Picea abies) and barley (Hordeum vulgare) were performed at the laboratory of Czech University of Life Sciences. Material was torrefied in an inert nitrogen atmosphere at the temperatures of 250 °C and 280 °C for 45 minutes. Elementary and stoichiometric parameters were monitored and impact of torrefaction and pellet production on carbon footprint was determined. Torrefied and pelleted material showed better fuel properties in comparison to the original material. Calorific value of the torrefied spruce wood chip increased by 12.27% when torrefied at the temperature of 250 °C, and by 25.41% when torrefied at the temperature of 280 °C.
Assessment of the Possibility of Reducing the Thermal Load in the Barn by using Mechanical Ventilation
Authors: Lendelová Jana , Hauliková Ana , Žitňák Miroslav , Kuchar Peter
Published: December 2021

The aim of this work is to evaluate possibility of reducing the heat stress of milking cows via climatic indices and the influence of air flow velocity in the object with milking cows using the cross-section method. For the purposes of evaluation, there was selected a four-row housing facility for 160 milking cows with natural ventilation; for the summer period, natural ventilation was supplemented with mechanical ventilation (2877 m3·h−1 per cow). Measurements were conducted in the network created with 12 measuring points across the barn width, repeated in five cross-sections A, B, C, D and E, followed by further measurements in the longitudinal direction performed always in a row of 22 points placed in resting zones along the air flow direction. Considering the state of potentially high heat load with THI >78, it was observed that, according to ETIC, without employing the fans, ETIC in AOZ was higher than nAOZ, ETICAOZ = 25.34 ±0.42 vs ETICnOAZ = 24.51 ±0.44 (p <0.05). After activation of fans above lying area, ETIC in AOZ was lower than nAOZ, ETICAOZ = 23.40 ±0.61 vs ETICnAOZ = 23.68 ±0.60, which was not validated in evaluation of THI. Even though the limiting value of very high heat stress ETIC = 25 was not exceeded after activation of fans, decreasing of heat stress in rest zones did not reach recommended value ETIC = 20. A more significant improvement was validated in ETIC evaluation with measurements in longitudinal direction in the lying area – there was confirmed dominant influence of air flow speed. Heat load decreasing was influenced by speed and distribution of air in AOZ, both overall and local air exchanges in AOZ with ACHv >100 h−1, and barn length.
Evidence for Phase Transitions in Replication Fidelity and Survival Probability at the Origin of Life
Authors: Garte Sy
Published: December 2021

Highly accurate self-replication of cellular phenotype is a requirement for biological evolution. I previously investigated the degree of self-replication fidelity needed in a viable, evolving population of living cells. Here I present a phase transition approach from non-living chemical complexity to evolving living creatures and illustrate the necessary non-continuity of whatever process led to the origin of evolution. A theoretical approach to the relationship between replication fidelity, survival probability and the capacity to grow and evolve is presented consistent with previous data from experimental simulations. The implications for the origin of life to include explanations for non-continuity are discussed.
A Survey on Proxy Re-Signature Schemes for Translating One Type of Signature to Another
Authors: Chaudhari Shilpa , Aparna R. , Rane Archana
Published: December 2021

Proxy Re-Signature (PRS) complements well-established digital signature service. Blaze-Bleumer-Strauss discussed PRS in 1998 for translating a signature on a message from Alice into a signature from Bob on the same message at semi-trusted proxy which does not learn any signing-key and cannot produce new valid signature on new message for Alice or Bob. PRS has been largely ignored since then but it has spurred considerable research interest recently for sharing web-certificates, forming weak-group signatures, and authenticating network path. This article provides a survey summarizing and organizing PRS-related research by developing eight-dimensional taxonomy reflecting the directional feature, re-transformation capability, re-signature key location, delegatee involvement, proxy re-signing rights, duration-based revocation rights, security model environment, and cryptographic approach. Even though multi-dimensional categorization is proposed here, we categorize the substantial published research work based on the eighth dimension. We give a clear perspective on this research from last two-decades since the first PRS-protocol was proposed.
A Review on Privacy Requirements and Application Layer Security in Internet of Things (IoT)
Authors: Sudha K. Swapna , Jeyanthi N.
Published: December 2021

Internet of Things (IoT) is the predominant emerging technology that targets on facilitating interconnection of internet-enabled resources. IoT applications concentrate on automating different tasks that facilitate physical objects to act autonomously without any human interventions. The emerging and current IoT applications are determined to be highly significant for improving the degree of efficiency, comfort and automation for its users. Any kind of security breach on the system will directly influences the life of the humans In this paper, a comprehensive review on Privacy requirements and application layer Security in Internet of Things (IoT) is presented for exploring the possible security issues in IoT that could be launched over the individual layers of IoT architecture. This review explores different challenges of classical security solutions that are related to authentication, key management and cryptographic solutions.It also presents the details of existing access control and device authentication schemes with their pros and cons.
Dactylogyrus Infestation in Farmed Common Carp Cyprinus carpio from Aquaculture Facilities in Macedonia
Authors: Blazhekovikj-Dimovska Dijana , Stojanovski Stojmir
Published: December 2021

A total of 958 specimens of farmed common carp Cyprinus carpio from eight of the most significant and largest cyprinid aquaculture facilities in Macedonia (pond and cage culture systems) were examined for parasitological investigation for three years. The following parasite species of the genus Dactylogyrus were identified: Dactylogyrus extensus, Dactylogyrus minutus and Dactylogyrus anchoratus. The highest prevalence was determined for D. extensus (38.8%), followed by D. minutus (7.9%) and D. anchoratus (2.8%). The highest mean intensity was determined for D. extensus (6.2), followed by D. minutus (4.7) and D. anchoratus (3.8). By seasons, the highest prevalence (16.5%) was recorded for D. extensus in winter, while the lowest (0.6%) for D. minutus in autumn. The highest mean intensity (8.0) was also determined for D. extensus in winter, and the lowest (1.9) for D. minutus in spring.
Fish Biodiversity, Threat Status and Conservation Significance of the Jamuna River, Bangladesh
Authors: Paul Sulav Indra , Majumdar Bhaskar Chandra , Hasan Mahmudul , Sarker Apurbo Kumer , Baidya Arpan , Hakim Md. Azizul
Published: December 2021

The present survey aimed to explore the fish fauna diversity, abundance and conservation status in the Jamuna River, a tributary of the River Brahmaputra, Bangladesh. During the study period from November 2018 to October 2019, a total of 55 species of fish were recorded, belonging to 6 orders, 20 families and 41 genera from the five selected stations near the river. Orders Cypriniformes and Siluriformes were recorded as the dominant group in the fish fauna community that comprises 34.55% and 30.91% of total species, respectively. Various types of Small Indigenous Species (SIS) and a total of 26 International Union for Conservation of Nature (IUCN) red-listed species were recorded. Population indices, viz. Shannon–Weaver index (H), Simpson’s dominance index (D), Simpson’s index of diversity (1-D), Margalef’s index (d) and Evenness (E), were applied to demonstrate the species diversity, richness and evenness of fish, and their overall values were 1.28-1.48, 0.26-0.33, 0.67-0.74, 1.22-1.46 and 0.77-0.86, respectively. To sustain the prospect of fisheries biodiversity in the Jamuna River of Bangladesh, different fish management and conservation plan of action specifically establishing and maintaining fish sanctuaries, banning indiscriminate fishing and the use of destructive fishing gears for the protection of the breeding and nursery grounds of fish should be taken into consideration with utmost priority.
Some notes on complex symmetric operators
Authors: Ferreira Marcos S.
Published: December 2021

In this paper we show that every conjugation C on the Hardy-Hilbert space H
2 is of type C = T *
𝒥T, where T is an unitary operator and

𝒥
f

(
z
)

=

f

(

z
¯

)

¯

\mathcal{J}f\left( z \right) = \overline {f\left( {\bar z} \right)}

with f ∈ H
2. Moreover we prove some relations of complex symmetry between the operators T and |T|, where T = U |T| is the polar decomposition of bounded operator T ∈ ℒ(ℋ) on the separable Hilbert space ℋ.
Effect of alpha-lipoic acid on arterial stiffness parameters in type 2 diabetes mellitus patients with cardiac autonomic neuropathy
Authors: Serhiyenko Victoria A. , Serhiyenko Ludmila M. , Sehin Volodymyr B. , Serhiyenko Alexandr A.
Published: December 2021

Objective. Significantly underdiagnosed, diabetes-associated cardiac autonomic neuropathy (CAN) causes a wide range of cardiac disorders that may cause life-threatening outcomes. This study investigated the effects of alpha-lipoic acid (ALA) on arterial stiffness and insulin resistance (IR) parameters in type 2 diabetes mellitus (T2D) patients and definite CAN.

Methods. A total of 36 patients with T2D and a definite stage of CAN were recruited. This investigation was carried out on two separate arms: traditional hypoglycemic therapy (n=18, control) and ALA (n=18) 600 mg in film-coated tablets/q.d. in addition to traditional hypoglycemic therapy. The duration of the study was three months.

Results. In subjects with T2D and definite stage of СAN, treatment with ALA resulted in a significant decrease of glucose, immunoreactive insulin concentration, and Homeostasis Model Assessment (HOMA)-IR (HOMA-IR) parameters; pulse wave velocity (PWV), aorta augmentation index (AIxao) during the active period of the day and decrease of PWV, AIxao, and brachial augmentation index during the passive period of the day compared with the results, obtained in the control group. Therefore, the administration of ALA to patients with T2D for three months promotes the improvement of glucose metabolism and arterial stiffness parameters.

Conclusions. In patients with T2D and definite stage of СAN treatment with ALA improved HOMA-IR and arterial stiffness parameters. These findings can be of clinical significance for the complex treatment of diabetes-associated CAN.
Nutrition management of Niemann Pick disease type C: A case report
Authors: Viana dos Santos Rejane , das Neves Ferreira Tamila , Oliveira de Almeida Daniela , Brito da Silva Fatal Lilian , Queiroz Araujo Edilene Maria
Published: December 2021

Objectives. We aim to report the clinical repercussions of a nutritional approach in a patient diagnosed with Niemann Pick disease type C (NPC) using miglustat as pharmacological therapy.

Case report. A 33-year-old woman diagnosed with NPC using miglustat was instructed to look for a dietary management at our nutrition service. Patient’s symptoms were weight loss and important gastrointestinal alterations. Our nutritional prescription was a high-calorie and high-protein, lactose- and sucrose-free diet, as well as a daily supplementation of L-glutamine, probiotics, omega 3, and coenzyme Q10. After two months, the patient had weight gain and improvement in the intestinal health.

Conclusions. We found that nutritional prescription aided in the treatment of NPC and revealed that nutritional care represents an important strategy in the management of rare genetic diseases.