bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparative technical and economic study of Hybrid Solar-Geothermal Power Plant in Ethiopia
Authors: Gemechu B. D. , Orlov M. E.
Published: February 2021

This paper presents a techno-economic assessment of a hybrid solar-geothermal power plant that is modelled taking into account the available geothermal and solar energy resources at the Tendaho-1 (Dubti) geothermal field in Ethiopia. The hybrid power plant combines a single-flash geothermal power plant with a parabolic trough solar thermal plant to increase the energy level of geothermal steam. The geothermal fluid from one of the production wells at the geothermal site and the direct normal solar irradiance prevailing in the area offer the primary sources of energy used in the modelling. A thermodynamic analysis based on the principles of mass and energy conservation and a figure of merit analysis that allows evaluating the energy and economic performance of the hybrid power plant were performed. The technical and economic efficiency assessment was performed by comparing the performances of the hybrid power plant with a power system consisting of stand-alone geothermal and solar power plants. Results of the techno-economic assessment showed that for the same amount of energy inputs, depending on the available thermal energy storage capacity, a hybrid power plant generates up to 10.4% more electricity than a power system of two stand-alone power plants while generating a higher net present value at a lower cost of generation. In addition, the hybrid power plants with and without thermal storage system exhibit an economic figure of merit values of 2.62 and 3.42, i.e. the cost of solar resource per kWh of electricity in the hybrid energy system is reduced by 70.5% and 61.5%, respectively.
Training of the current reserve in «Mosoblenergo» JSC
Authors: Kropachev S. A.
Published: February 2021

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Penerapan Model Pembelajaran Kooperatif Tipe CTL untuk Meningkatkan Hasil Belajar Siswa Kelas XI pada Materi Elastisitas di SMAN 1 Peusangan
Authors: Ismatunsarrah Ismatunsarrah , Ridha Iqbal , Hadiya Izkar
Published: February 2021

Penelitian ini bertujuan untuk mengetahui efektifitas penerapan metode pembelajaran CTL dalam meningkatkan hasil belajar fisika peserta didik kelas XI IPA 2 di SMA Negeri 1 Peusangan pada materi elastisitas. Jenis penelitian yang digunakan menggunakan metode Penelitian Tindakan Kelas (PTK). Waktu penelitian selama 3 bulan. Subyek penelitian yakni peserta didik kelas XI IPA 2 yang berjumlah 22 orang. Hasil pembelajaran sesudah dilakukan tindakan penerapan metode pembelajaran CTL terlihat adanya peningkatan sampai 37% dibanding kondisi awal dengan merujuk pada hasil tes. Rasa ingin tahu peserta didik juga meningkat selama proses pembelajaran yang ditandai dengan keaktifan peserta didik berdiskusi dan bertanya jawab dalam kelompok belajar. Hal ini terlihat sangat berbeda dengan suasana belajar sebelum dilaksanakan penelitian.
Deskripsi Pemahaman Konsep Calon Guru pada Materi Perancangan dan Pembangunan Laboratorium Kimia Menggunakan Model Discovery Learning
Authors: Sartika Rody Putra , Ariansyah Deden , Azhari Ilyas
Published: February 2021

A prospective chemistry teacher needs to learn about the planning and construction of a chemical laboratory that they can apply when becoming a chemistry teacher at school. This study aims to describe prospective teachers' understanding of discovery learning on the topic of designing and construction of the laboratory. The form of this research is pre-experimental with the design of one shoot case study. Subjects in this study were 21 chemistry education department students of Tanjungpura University conducted. Data collection using measurement techniques with learning outcomes test instruments. Data then were analyzed through steps as follows: 1) data reduction; 2) data presentation; 3) data deduction. The results obtained by understanding the concept of students on the indicators determine and explain the selection of laboratory development positions are in the right criteria. The indicator determines and explains the selection of space for students in the laboratory is in the first category
Analisis Kelayakan dan Kepraktisan Modul Praktikum Berbasis Literasi Sains untuk Pembelajaran IPA
Authors: Samsu Nur , Mustika Dona , Nafaida Rizky , Manurung Nurhasnah
Published: February 2021

Practicum modules are needed during the practical learning process activities that can be used by teachers and students. Science literacy must be mastered by students, because it is related to the environment. Science literacy is assessed from three aspects namely content, process and context. The purpose of this study was to determine the feasibility test and practical test of practicum modules based on science literacy for science learning in SMP Negeri 1 Langsa. This type of research is research and development which is modified into three stages of research implementation with the module trial stage developed in the form of research and information gathering, module design phase and module development stage with documentary study data collection techniques, questionnaires, and experiments. The scores obtained will be processed using descriptive analysis by conducting a feasibility test by material and media experts consisting of biology education lecturers while the practicality test uses a questionnaire distributed to students of class VIII at SMP Negeri 1 Langsa on Natural Sciences subjects. The results showed that the IPA practicum product modules analyzed consisted of three categories: the percentage value of the highly valid aspects with a value of 78% on the module quality element, while the practicality test consisted of three aspects namely the content, process and context aspects of the results of the three aspects. The percentage value of 82.8% of the aspects of positive student response content that practicum modules are used is very practical. Based on the values obtained that the IPA practicum module is feasible and practically used as a practical guide.
Identifikasi Tingkat Kemampuan Berpikir Kritis Siswa pada Materi ASI Eksklusif dan Program Keluarga Berencana
Authors: Sinurat Risdawaty , Nevrita Nevrita , Hindrasti Nur Eka Kusuma
Published: February 2021

High school students should be able to think critically in responding to myths related to exclusive breastfeeding and family planning programs, because they are used to thinking scientifically. The purpose of this study was to determine the level of critical thinking skills of students on exclusive breastfeeding material and family planning programs in SMA Negeri I Bintan Timur. This quantitative descriptive study was conducted in the even semester of the 2018/2019 school year. The sample in this study amounted to 100 students who were determined using the Random Sampling technique. The data in this study are students' critical thinking skills. Researchers collected data using test instruments in the form of essay questions and interview rubrics. The instrument was developed based on aspects of  critical thinking, namely: (1) Basic clarification; (2) Bases for a decision; (3) Inference; (4) Advanced clarification; (5) Supposition and integration; (6) Abilities facilitate the other abilities. Furthermore, the data were analyzed using a statistical formula in the form of a percentage. Based on the results of the data analysis, it can be concluded that the critical thinking ability of the 11th grade students of Mathematics and Natural Sciences in East Negeri I Bintan is in the less category. Based on the aspect of critical thinking ability, the results obtained are aspects of basic clarification, bases for decisions, and inference in the good category, aspects of advanced clarification in the less category, while aspects of suppositionand integration and the abilities to facilitate other abilities in the middle category
Pengembangan Handout Materi Sistem Koloid Berbasis Guided Note Taking untuk Meningkatkan Hasil Belajar dan Respon Siswa Kelas XI SMA
Authors: Sari Sri Adelila , Putri Sulistia Ningsih
Published: February 2021

One reason for the low student learning outcomes is the inactivity of students in making notes independently. This study was aimed to develop (HGNT) on colloidal system material. The research method used was research and development (RD) with the 4D model, namely: (i) Define, (ii) Design, (iii) Development, and (iv) Disseminate. The research instrument used to assess the feasibility of the HGNT that has been developed was a validation sheet, while in the dissemination stage, learning outcomes and student responses were measured using an objective test and questionnaire. The study was conducted at Budisatrya Private High School Medan in class XI IPA 1. The results showed that the developed HGNT was obtained very decent criteria. In addition, student learning outcomes were found to be improved and student responses to HGNT showed a positive category. Based on the results of this study, it can be concluded that the HGNT which has been developed was very feasible to use in learning of the colloidal system material, and student learning could be success with a very positive responses
Uji Anti Jamur Ekstrak Buah Mengkudu (Morinda citrifolia L.)
Authors: Hardani Ririen , Krisna I Kadek Adi , Hamzah Baharuddin , Hardani Muhammad Fakhrul
Published: February 2021

Noni is a plant that has the potential to be used as traditional medicinal ingredients. This study aims to determine the inhibition of noni extracts (Morinda citrifolia L.) in inhibiting the growth of the fungus Candida albicans. This type of research is experimental. A total of 150 grams of dried noni fruit that has been mashed, macerated with three different types of solvents namely aquades, acetone and n-hexane to obtain thick extract. Preparation of the fungus suspension was Candida albicans made by mixing the media Nutrient Broth with 5 ose test fungus that were equated with turbidity of a standard MC. Farland. The fungus suspension made was implanted on the Sabouroud Dextrose agar to solidify and divided into 7 sterile petri dishes. Testing the inhibition of fungi using the method of wells. Each cup is made of 1 hole diameter of 3 cm in the center. Tests were carried out by adding non-solvent aquades fruit extract into the 1 cup, acetone noni fruit extract into the cup 2, n-hexane solvent noni fruit extract into the cup 3, for 3 other plates added with three solvents as negative control, while for 1 cup added to the cup fungal infection drug is nystatin as a positive control, each as much as 1 mL. Measurement data were analyzed using the formula of the percentage of inhibition. Inhibitory power of noni fruit extract using distilled water is 3.55%, noni fruit extract using acetone solvent is 50.15%, noni fruit extract using n-hexane solvent that is equal to 38.83%. negative control of aquades, acetone and n-hexane solvent has no inhibitory power while positive control of nystatin is 9.73%. Noni fruit extract using acetone solvent has the strongest inhibitory ability. It can be concluded that the noni fruit extract has fungal inhibitory effect on the growth of the fungus Candida albicans
Analisis Karakteristik Kemampuan Literasi Sains Konteks Bencana Gempa Bumi Mahasiswa Pendidikan IPA pada Domain Pengetahuan Prosedural dan Epistemik
Authors: Fadilah Muhyiatul , Permanasari Anna , Riandi Riandi , Maryani Enok
Published: February 2021

The typical geological structure of West Sumatra causes a high risk of earthquakes. Therefore, the ability of disaster context science literacy (LSKB) needs to be developed in order to students can apply science to solve problems related earthquakes. The research aims to describe the characteristics of the early science literacy abilities of science education students about earthquake markers. The knowledge aspect of scientific literacy is focused on the procedural and epistemic domains. Determination of research subjects by purposive sampling involving 70 students. Data collection was carried out with thorough tests and surveys using the LSKB Test and the Disaster Preparedness Questionnaire. Data were analyzed quantitatively-descriptive. The results showed that: 1) The level of mastery in the domain of procedural and epistemic knowledge was 38.18 and 19.12, included in the very low category, 2) In procedural knowledge, students already had sufficient knowledge in determining variables but had problems making graphs and graphical interpretations, 3) In epistemic knowledge, analysis and inference most mastered by students, 4) the characteristics of procedural and epistemic knowledge are content novelty, contextuality, dimensions of inquiry, scientific exploration and data visualization. It can be concluded that the level of mastery of procedural and epistemic domain knowledge in science students is still moderate, and it requires training in the three domains of scientific literacy
Analisis Pengembangan Video Pembelajaran Fisika Berbasis CTL pada Materi Fluida
Authors: Novisya* Dira , Desnita Desnita
Published: February 2021

Needs analysis becomes an empirical basis for developing research. Data and studies are produced from a complete needs analysis in producing the right product. In this study the analysis was conducted as a preliminary study to reveal the needs of stake holders for CTL-based videos for fluid material. Applied survey research methods with quantitative and qualitative approaches. Research objects related to student characteristics, learning resources, teaching materials and learning media. Quantitative and qualitative data collection procedures use questionnaire and interview instruments. Technical analysis of quantitative dataprocess and categorize data while qualitative data reduces, presents and verifies data. Obtained the results of student characteristics are good, but the aspect of interest shows the lowest value, especially solving and finding solutions to problems of daily life. The media teachers use to teach fluids are powerpoints, images and videos. Learning resources are only textbooks equipped with teaching materials in the form of encyclopedias, modules and worksheets that contain a collection of questions that do not provide experience in solving everyday problems. These findings indicate that the cause of the lack of student interest in solving everyday problems and the low student learning outcomes is that learning media is not in accordance with needs. Media is needed that can facilitate students solving everyday problems. Fluid material that has many daily applications, media needed in the form of CTL-based video. Besides CTL-based videos can display phenomena in full, videos can also develop students' higher-order thinking skills by thoroughly analyzing the phenomena that are displayed
Students' Perceptions of the Internalization of Islamic Values in Buffer Solution Teaching Materials
Authors: Sundari Uun , Heliawati* Leny , Permanasari Anna
Published: February 2021

Learning that has a divine value has an important role in preparing a generation of higher quality, who masters science and technology with good morals. This study aims to analyze students' perceptions of chemistry teaching materials on buffer solution material with Islamic internalization values. This study compares students' perceptions of teaching materials that have been used with teaching materials internalized with Islamic values. The perception of the Islamic value in this study was measured by analyzing the motivation, use, and belief of the buffer solution teaching material that integrates Islamic values. This type of research is ex post facto research by collecting data directly to respondents through questionnaires, interviews, and observations. The data analysis technique was done by descriptive qualitative method. This research conducted on 50 eleventh dan twelfth-grade students. The target analysis of these needs is focused on students studying in Islamic-based schools. The results showed that the number of students in the category of “highly need teaching materials with Islamic internalization” was 36 people (72%), 14 people are in “need” category (28%), and no one was of the view that teaching materials with Islamic internalization were not needed. From this study, we can conclude that students in Islamic-based schools have good perceptions and need buffer solution teaching material with Islamic internalization values
Moodle-Enabled Virtual Lab for Fieldbus Process Control
Authors: Viegas Vítor , Dias Pereira José Miguel Costa
Published: February 2021

The paper presents a Moodle-enabled remote laboratory intended to teach the principles of process control using the Foundation Fieldbus technology. The student logs into Moodle and accesses a “Virtual PC” learning activity that opens a private remote desktop with all set to run an FF simulator. Behind the scenes, a virtualization infrastructure, hosted on the Azure cloud, handles storage, cloning and deployment of virtual machines. The paper explains how this infrastructure was set up and how it works internally. Positive results were achieved with a limited number of students, on an elective course, making us believe that this infrastructure can be extended to highly populated courses.
Teaching Random Variables
Authors: Jovanovic Dolecek Gordana
Published: February 2021

This paper presents demo program for teaching random variables dedicated to demonstration and visualization of behaviour of the product of m independent uniform random variables. The demo is used as a complementary tool in the teaching Random signals and processes curriculum at the graduate level. The demo is made in MATLAB and utilizes all benefits provided by MATLAB, such as simplicity, and good graphic environment, interactive use, among others. Additionally, this demo is used with other demo programs, also made in MATLAB, in teaching/learning process of random variables. Students were very satisfied with this demo program expressing that helped them understanding better the behaviour of the product of uniform random variables.
The Increase of Brazilian Students in a Portuguese Engineering School
Authors: Reis Mateus , Duarte Teresa , Marques Eduardo , Borges Catarina , Sousa Fernando , Carbas Ricardo , Da Silva Lucas
Published: February 2021

In the last fifteen years, the number of Brazilian students in Portugal has shown an increase of more than 600%. This trend was firstly driven by Portuguese economic recovery, which included investments in university education and incentives for receiving foreign students, through the international student statute, established in 2014. In the same year, Portugal started to accept the Brazilian national exams (ENEM) for the university admission, increasing the educational migratory flux once a directly access was stablished. Moreover, other secondary reasons led to this increase, such as the opportunity to study and live in a safer country and the possibility of obtaining a prestigious foreign degree. Currently, Brazilian students represent more than 33% of the foreign students in Portugal. However, the Brazilian students are highly concentrated in the top 3 Portuguese universities, Coimbra, Lisbon and Porto. In the specific case of the University of Porto, 73% of the foreign students are of Brazilian origin, with the Faculty of Engineering (FEUP) representing the largest contingent. This sharp growth in a specific group of foreign students on the engineering courses has created several important educational challenges, as the Brazilian students often exhibit higher failure rates in exams and curricular units as well as increased dropout rates when compared with Portuguese students. This is due to several factors, such as differences on the educational methodology, the quality of the high-school education, cultural differences, difficulty of adaptation and other socioeconomics aspects. The present work evaluates the causes behind the limited academic success of Brazilian students and introduces the measures and methodologies applied to the Brazilian students on the Faculty of Engineering of University of Porto, and on the Integrated Master’s in Mechanical Engineering (MIEM) in particular, in the pursuit of maintaining educational equality and ensuring success for all enrolled students, independently of their origin.
Post-COVID Recovery Assessment Clinics: A Real Need of Time
Authors: Raza Muhammad Ahmer , Aziz Shireen , Shahzad Sana , Raza Shahid Masood
Published: February 2021

COVID-19 is an infectious respiratory and vascular disease caused by SARS-CoV-2. This virus was first identified in Wuhan, China and caused an ongoing pandemic. The World Health Organization (WHO) declared the outbreak a public health emergency of international concern in January 2020 and a pandemic in March 2020. Reports suggest that patients experience persistent deficits in pulmonary and cognitive functioning, as well as multifaceted health issues and worsened quality of life. From records in Italy and France, COVID-19 survivors experience the return of symptoms. COVID-19 survivors need specialist investigation once they have been discharged from hospital. No proper guidelines are recommending that COVID-19 survivors should be under assessment. We intended to provide a model to assist local healthcare systems to establish post-COVID recovery assessment clinic(s) for CVOID-19 survivors. Our model will enable COVID-19 patients’ access to multi-professional advice, so that they are put onto the right clinical pathway to treat their symptoms. Furthermore, the findings of different specialties in post-COVID recovery assessment clinic(s) may help doctors determine the best discharge plan for COVID-19 patients.
A Positive Project Outcome: Lessons from a Non-Dominant Government University-Based Program
Authors: Lutomia Anne Namatasi , Bello-Bravo Julia , Medendorp John , Pittendrigh Barry
Published: February 2021

This article explores factors contributing to a non-dominant collaboration paradigm in a partnership between a government-based international development agency and a university-based non-governmental organization. Anchored in Wood’s and Gray’s collaborative framework, this article describes how the steeply hierarchical partnership navigated the elements of collaboration – organizational autonomy; shared problem domain; interactive processes; shared rules, norms, and structures; and decision making – to produce non-dominant values and practices deriving from negotiated processes, rules, norms, and structures that produced positive collaboration outcomes. In particular, a history of prior mutually beneficial interactions emerges as a critical precondition for achieving a non-dominant collaboration in this case study’s steeply hierarchical organizational relationship, one in which egalitarianism and equal decision-making regarding the agenda and the goals of the collaboration could have been highly constrained.
Artist's Statement: D Street
Authors: Bauer Marlene
Published: February 2021

Artist’s Statement for the cover art of IJPS volume 7, issue 2: D Street, acrylic and ink on paper
Phytoremediation of zinc polluted soil using sunflower (Helianthus annuus L.)
Authors: Soares Elda , Hamid Abdul , Mangkoedihardjo Sarwoko
Published: February 2021

This study aimed at assessing the ability of sunflower to remediate zinc (Zn) impacted soils and the partitioning factors of Zn in soil-plants interactions. The research method used ex situ experiments using teddy bear sunflower seeds with 8 different treatments for each. This began with the preparation of the sample soil media on garden soil, and the seeding of sunflower seeds. This research was carried out for six months starting in August - December 2020, with Helianthus annuus plants with variations of the Zn. Various concentrations of Zn were applied, ranging from 50 ppm to 350 ppm. Laboratory analysis of Zn was carried out using the Atomic Absorption Spectrophotometry (AAS) method. The research results have revealed that roots have the ability to translocate more Zn than shoots, which suggests a phytoremediation mechanism. Sunflower plants are able to translocate Zn, which proves it reliable for phytoremediation of Zn-polluted soil.
РОЗРОБКА ІНГІБІТОРІВ КОРОЗІЇ МЕТАЛІВ У ВОДНИХ СЕРЕДОВИЩАХ ІЗ РІЗНИМ РІВНЕМ МІНЕРАЛІЗАЦІЇ
Authors: Gomelya Mykola , Stepova Olena , Kamaiev Viktor
Published: February 2021

Актуальність теми дослідження. Актуальність теми дослідження зумовлена гостротою проблеми захисту трубопроводів та обладнання від корозії при контакті з природними та стічними водами, включаючи високомінералізовані шахтні та пластові води. Постановка проблеми. Нині застосування високоефективних інгібіторів для захисту трубопроводів та обладнання від корозії та відкладень в енергетиці, промисловості, видобувній галузі є економічно вигідним та доцільним у плані захисту довкілля від шкідливих впливів при виливі або скиді забруднених вод із високою мінералізацією.
Аналіз останніх досліджень і публікацій. Досліджено застосування пасиваційних інгібіторів, таких як оксиетилендефосфонова кислота. Цей реагент забезпечував високу стабільність води щодо осадко відкладень. Високу ефективність при боротьбі з корозією забезпечували й інші композиції на основі фосфонових кислот. Ефективні інгібітори є досить дорогими, а сировина для їх виготовлення є важкодоступною на Україні. Виділення недосліджених частин загальної проблеми. Створення ефективних інгібіторів корозії на основі похідних фосфористої та диметилолфосфінової кислот, перспективних стабілізаторів накипеутворення. Виклад основного матеріалу. Було розроблено новий метод синтезу диметилсульфонатфосфінату натрію із гіпофосфіту натрію, пара форму та сульфіту натрію, а також створено новий інгібітор – нітрилоксиетиледиметилфосфонову кислоту шляхом конденсації фосфористої кислоти з етанол аміном в присутності формальдегіду. Отримані реагенти використовували як інгібітори корозії металів у водних середовищах. Показано, що вони не
поступаються за ефективністю іншім інгібіторам пасиваційного типу у прісних водах. У мінералізованих водах ефективними були інгібітори адсорбційного типу. Висновки відповідно до статті. Створено нові методи синтезу диметилсульфонатфосфінату натрію та нітрилоксиетиледиметилфосфонової кислоти з доступних реагентів. Досліджено інгібітори корозії металів на основі диметилсульфонатфосфінату натрію та нітрилоксиетилдиметилфосфонової кислоти. Показано, що вони, наряду з іншими фосфонатами є ефективними інгібіторами корозії металів у прісних водах. Їх ефективність зростає в присутності іонів цинку. Показано, що інгібітори пасиваційного типу неефективні при захисті від корозії металів у високо мінералізованих водах. Захист металів від корозії забезпечують інгібітори адсорбційного типу.
ПРОБЛЕМИ ЗАБЕЗПЕЧЕННЯ ВОДОКОРИСТУВАННЯ САДІВНИЧИХ ТОВАРИСТВ ЧЕРНІГІВЩИНИ В СУЧАСНИХ УМОВАХ
Authors: Tereshchuk Oleksiy , Movenko Victor
Published: February 2021

Актуальність теми дослідження. У зв’язку з введенням у дію Закону України № 1830 від 07.02.2017 року «Про внесення змін до деяких законодавчих актів України, що регулюють відносини, пов’язані з одержання документів дозвільного характеру щодо спеціального водокористування» змінився порядок надання дозволів на спеціальне водокористування, що потребує досліджень та розрахунків водокористування та водовідведення відповідних водокористувачів. Постановка проблеми. Для отримання дозвільних документів щодо спеціального водокористування водокористувачі повинні виконати дослідження й розрахунки потреби у воді та оцінку обсягів водокористування відповідних
садівничих товариств та надати технічну документацію в дозвільний центр. Аналіз останніх досліджень і публікацій. Були розглянуті останні публікації у відкритому доступі, присвячені
проблемам водокористування та водовідведення в сучасних умовах. Виділення недосліджених частин загальної проблеми. Потреби у воді та оцінка обсягів водокористування садівничих товариств, відповідно до сучасних нормативних документів, не досліджені й не визначені. Постановка завдання. Розглянуті дослідження і розрахунки потреб у воді та оцінка обсягів водокористування
відповідних садівничих товариств та рекомендації щодо природоохоронних заходів. Виклад основного матеріалу. У статті розглянуто питання вирішення проблем спеціального водокористування садівничих товариств, дослідження й розрахунки їхніх потреб у воді та оцінка обсягів водокористування, запропоновані необхідні природоохоронні заходи. Висновки відповідно до статті. Проведені дослідження садівничих товариств дозволили визначити поливну площу, потреби у воді на поливання садівничих ділянок та обсяги їх водокористування.
ТЕОРЕТИЧНЕ ОБҐРУНТУВАННЯ ТОЧНОСТІ ВИЗНАЧЕННЯ ПЛОЩ ЗЕМЕЛЬНИХ ДІЛЯНОК ПОЛЮСНИМ МЕТОДОМ
Authors: Kryachok Serhiy , Mamontova Lyudmila , Shcherbak Yuliya
Published: February 2021

Актуальність теми дослідження. Визначення площ територій є одним із головних завдань геодезичного супроводу землеустрою. Достовірність інформації про земельні ресурси безпосередньо пов’язана з точністю визначення площ земельних угідь. Необхідність у визначенні площі виникає і під час вирішення містобудівних завдань, проведення рекреаційних робіт, вертикального планування будівельних майданчиків, прогнозування територій підтоплення та лісових пожеж. Постановка проблеми. Є такі методи визначення площ: графічний, інструментальний, аналітичний. Графічний метод передбачає застосування спеціально розграфлених палеток із прозорого матеріалу, які наклада-
ються на картографічне зображення ділянки. Площу підраховують за кількістю елементарних фігур у вигляді прямокутників з відомою площею. Інструментальний метод потребує використання механічних чи електронних планіметрів. Площа ділянки на її картографічному зображенні визначається після обведення контуру спеціальним важелем з маркою за різницею відліків за шкалою планіметра. Найбільш точним є аналітичний метод. Він передбачає визначення площі ділянки за координатами точок, розташованих на контурі ділянки, з використанням відповідного математичного апарату.
Аналіз останніх досліджень і публікацій. Були розглянуті останні публікації у відкритому доступі, які присвячені точності визначення площ аналітичним методом. Виділення недосліджених частин загальної проблеми. Недослідженою є точність визначення площ земельних ділянок полюсним методом з урахуванням кореляційних залежностей між суміжними горизонтальними кутами,
виміряними на межових знаках. Мета статті. Головною метою статті є теоретичне обґрунтування точності визначення площ земельних ділянок полюсним методом з урахуванням кореляційної залежності між суміжними горизонтальними кутами, виміряними на межових знаках.
Виклад основного матеріалу. Виконано теоретичне обґрунтування визначення площ земельних ділянок у вигляді багатокутників полюсним методом з урахуванням виміряних горизонтальних кутів та довжини базису. На основі отриманих формул визначено вирази для часткових похідних. З урахуванням кореляційної залежності між горизонтальними кутами виведені формули для визначення середньої квадратичної похибки визначення площ земельних ділянок із конфігурацією меж у вигляді багатокутника. Виконано спрощення загальних формул для визначення точності площ ділянок у вигляді правильного трикутника та п’ятикутника, прямокутника, квадрата. Наведено розрахунки точності площ земельних ділянок для вказаних фігур за спрощеними формулами. Висновки відповідно до статті. Виконано теоретичне обґрунтування точності визначення площ земельних ділянок
полюсним методом з урахуванням кореляційної залежності між горизонтальними кутами, виміряними на межових знаках. Загальні формули спрощені для випадків конфігурації меж у вигляді правильного трикутника та п’ятикутника, прямокутника та квадрата. Наведено приклади обчислення точності визначення площ для вказаних фігур.
Rīgas Stradiņa universitātes profesionālās bakalaura studiju programmas “Policijas darbs” noslēguma pētniecisko darbu kopsavilkumi (2020./2021. mācību gads)
Authors:   Rīgas Stradiņa universitāte, Juridiskā fakultāte, Gribova Angelina , Āre Ģirts , Briņķis Andris , Frīdvalde Judīte , Graudiņa Kristīne , Ose Ieva , Krafte Agnese , Smiltene Annija , Šteinberga Dace , Rupeiks Mārtiņš
Published: February 2021

Lai policijas darbinieku pētnieciskajos darbos iegūtā informācija, secinājumi un priekšlikumi būtu apzināti un izsvērta to lietderība praktiskai izmantošanai, RSU Juridiskā fakultāte kopā ar Izdevniecības un poligrāfija nodaļu ir izstrādājušas “Noslēguma pētniecisko darbu kopsavilkumus”. Izdevumā apkopoti labākie profesionālās bakalaura studiju programmas “Policijas darbs” studentu pētījumi dažādos policijas darba virzienos ar pamatotiem secinājumiem un konstruktīviem priekšlikumiem normatīvās bāzes uzlabošanā. Valsts policijas amatpersonu izvēlētās pētniecisko darbu tēmas ir aktuālas noziedzības apkarošanas un sabiedriskās kārtības nodrošināšanas jomā. Pētījumos iegūtā informācija ir pietiekami inovatīva un specifiska, savukārt tajot gūtie rezultāti var būt lietderīgi Valsts policijas darbības pilnveidošanā.
Oglądanie telewizji w telewizji. Przypadek Gogglebox
Authors: Wendlińska Anna
Published: February 2021

Autorka w niniejszej pracy próbuje przedstawić zjawisko komunikacji społecznej w przekaziereality TV, a także skupia się na analizie brytyjskiej i polskiej wersji formatuGogglebox. Stara się pokazać kierunki rozwoju telewizyjnej rozrywki, skupiając się nagatunku reality TV. W pracy przytoczono wyniki badań jakościowych grupy studentów.Na przykładzie programu Gogglebox, autorka próbuje wskazać przyczyny zainteresowaniaodbiorców telewizją rozrywkową i postrzeganie uczestników tego typu programów.Dodatkowo obrazuje wpływ konwergencji mediów na oglądalność przekazu telewizyjnego.
Efeito do tratamento com Casearia Sylvestris sobre a angiogênese induzida pelas células tumorais de Ehrlich
Authors: Francese Monique Malta , Christianini Ádrika Maria Andrade , Weckwerth Paulo Henrique
Published: February 2021

Objetivo: Avaliar a interferência do tratamento com extrato de Casearia Sylvestris Sw. sobre a angiogênese induzida por células tumorais de Erhlich. Métodos: Utilizou-se 28 ovos embrionados aleatoriamente distribuídos em quatro grupos de ovos (n=7/grupo), sendo eles: Grupo 1 - Soro fisiológico; Grupo 2 - Tumor de Ehrlich (TE); Grupo 3 - Casearia Sylvestris Sw. - Grupo 4: Casearia Sylvestris Sw + Tumor de Ehrlich. Os ovos foram submetidos à incubação durante 48 horas; sendo sujeitados ao tratamento decorridas 24 horas iniciais de incubação. Resultados: O tipo de tratamento aplicado em cada grupo interferiu individualmente nos resultados, onde relatou-se: Grupo 1- Padrão normal de crescimento (grupo controle); Grupo 2 - Aumento na proliferação de vasos sanguíneos; Grupo 3 - Baixa interferência no efeito do tratamento; Grupo 4 - Ramificações de vasos sanguíneos menos evidentes. Conclusão: Considera-se através dessa técnica a possibilidade da utilização do extrato de Casearia Sylvestris Sw. para o tratamento de células tumorais de Ehrlich, pela eficácia da planta contra proliferação de células malignas, entretanto devem ser realizados testes confirmatórios para confirmar quais propriedades da mesma são responsáveis por tal efeito.
Condromatose sinovial: caso raro em articulação temporomandibular
Authors: Da Silva Cibele Leite , Araújo Laís Farias , Theotonio Pedro Emanuel Sales , Loureiro Ariana Maria Luccas Costa , De Araújo Rafaella Amorim Bittencourt Maranhão , Filho Luciano Schwartz Lessa , Nogueira Pedro Thalles Bernardo de Carvalho
Published: February 2021

Objetivo: Relatar um caso cínico de condromatose sinovial em articulação temporomandibular direita. Detalhamento do caso: Durante o exame físico foi observado um aumento de volume na região pré-auricular direita, assimetria facial e limitação de abertura bucal, além de deflexão durante a abertura. No exame de imagem (tomografia computadorizada) observou-se imagem hiperdensa em região de articulação temporomandibular direita, recobrindo todo o côndilo mandibular direito. Logo, foi realizada uma biópsia incisional da região, e encaminhada para analise histopatológica onde foi obtido o diagnóstico de condromatose sinovial. Como tratamento definitivo, foi realizada a exérese total da lesão sob anestesia geral, com o acesso pré-auricular. Atualmente, a paciente encontra-se em pós-operatório de dois anos, apresenta abertura de boca satisfatória ausência de queixas álgicas e boa abertura bucal. No exame tomográfico de controle não foi observado qualquer sinal de recidiva. Considerações finais: O diagnóstico de condromatose sinovial na articulação temporomandibular é desafiador. Caracteriza-se por ser uma lesão rara e comumente descartada do diagnóstico diferencial inicial. Desta forma, é relevante a realização de exames radiológicos e histopatológicos para auxilio no diagnóstico correto.
Contribuições das práticas e estágios no curso de enfermagem para a formação acadêmica
Authors: Jardim Suellen Hoffmann , Bernardino Paloma dos Santos , Ferreira Beatriz Neres , Cacciari Pamella
Published: February 2021

Objetivo: A proposta do estudo é mencionar a experiência de acadêmicas de enfermagem durante as práticas e estágios realizados no decorrer do curso. Relato de experiência: Trata-se de um estudo descritivo, tipo relato de experiência, elaborado a partir das vivências das autoras do presente trabalho. Os dados obtidos na experiência das alunas evidenciaram que as práticas e estágios contribuem para o conhecimento do aluno acerca do SUS e fornece a possibilidade de vivenciar acontecimentos reais e fictícios, como realizar curativo, cuidar de um paciente com distúrbios psiquiátricos e dependência química, visita domiciliar e atender puérpera e recém-nascido, desenvolvendo assim a capacidade de analisar e responder à situações do ser enfermeiro, devido a utilização de todo o seu conhecimento adquirido em âmbito teórico e prático. Contudo, defronta-se com inseguranças, distinção entre teoria e prática e cobranças excessivas. Considerações finais: As práticas e estágios são relevantes para a formação integral do aluno de enfermagem para atuar nos diferentes níveis de atenção.
Análise da ocorrência de reações adversas à poliquimioterapia no tratamento para hanseníase
Authors: Pires Carla Andréa Avelar , Dos Santos Maria Amélia Lopes , Biasi Beatriz Hosana , Moreira Amanda Gabay , Coimbra Amália Costa , Ferreira Mariana Chisté , Nascimento Mayara Silva , De Brito Juliana Bacellar Nunes , Carneiro Francisca Regina Oliveira
Published: February 2021

Objetivo: Analisar os principais efeitos colaterais do esquema medicamentoso padrão, poliquimioterapia, utilizada no tratamento para hanseníase. Métodos: Trata-se de estudo transversal descritivo, conduzido com 40 participantes, atendidos no Ambulatório de Dermatologia da Universidade do Estado do Pará. Os pesquisadores empregaram uma adaptação da Ficha para Investigação de Ocorrência de Efeitos Adversos na Poliquimioterapia (PQT) em hanseníase, com variáveis agrupadas em perfil social, dermatológico, laboratorial e reacional. Resultados: Os pacientes em sua maioria foram: homens, com mais de 60 anos de idade, aposentados, com apenas ensino fundamental. Quanto a classificação clínica, predominantemente, a forma dimorfa e multibacilar, em 12 meses de tratamento. Os sistemas orgânicos com maior relação com reações adversas foram: excretor, nervoso, tegumentar e respiratório, sobretudo mediante ao uso da dapsona. Entre os efeitos adversos, destaca-se o enjoo (32,50%) no uso de rifampicina, mialgia (65%) no uso de dapsona e hiperpigmentação cutânea (77,50%) no uso de clofazimina. Conclusão: O presente estudo demonstrou que as reações adversas mais frequentes foram leves e estão associadas ao uso de dapsona e clofazimina, sendo de suma importância a detecção precoce desses efeitos, para eficaz intervenção de eventos graves.
Multiorgan damage and dysfunction due to infection by severe acute respiratory syndrome coronavirus-2 and post-recovery complications
Authors: Singh Inder Raj , Parayitam Mallikarjun Ratnam , Chauhan Vandana , Vermani Maansi , Yadav Sunishtha Singh
Published: February 2021

Large clusters of patients were reported with pneumonia such as symptoms of unknown causes, all linked to a seafood, and wet animal wholesale market in the city of Wuhan, Hubei Province, China in December 2019. This was followed by studies conducted by the Chinese authorities leading to the detection of a novel strain of coronavirus named as 2019-novel coronavirus. Further studies on the viral genome indicated that the virus is possibly of bat-origin belonging to the genus Betacoronavirus and family Coronaviridae. The name of the virus was changed to severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) due to its high similarity with SARS-CoV-1 and the disease was named coronavirus disease-2019 (COVID-19). The disease was declared a pandemic by the WHO by March 12, 2020. As of December 17, 2020, the total cases have been reported to be around 7.29 million with 1.63 million deaths worldwide. Symptoms of the disease can range from severe pneumonia requiring mechanical ventilation to basic symptoms such as fever and cough sometimes even being asymptomatic. Diagnostic tests include different laboratory based, point-of-care, and serological tests for controlling the spread of the disease. It has been indicated that the virus shows its effect by complete immune dysregulation due to excessive release of cytokines which is known as “cytokine storm” leading to the effect on multiple organs mainly the lungs through pneumonia such as symptoms, liver by causing severe damage indicated by high aspartate aminotransferase and alanine aminotransferase levels, kidneys through renal damage, and neurological symptoms being reported in some cases. It also affects circulatory systems through blood coagulation, skin damage, etc. Different symptoms have also been observed post recovery in the respiratory, cardiovascular, endocrine, and immune systems. Currently used treatment strategies are mostly symptomatic that includes use of invasive and non-invasive ventilation and broad spectrum antibiotics and steroids. Furthermore, different novel treatments are also being developed. It is extremely important to conduct further research on the effects of the disease on different organs and post-recovery symptoms to not only develop better diagnostic tools and treatment strategies but also to help people that have already recovered from the disease.
Synthesis and styrene copolymerization of novel trisubstituted ethylenes: 11. Halogen ring-trisubstituted 2-methoxyethyl phenylcyanoacrylates
Authors: Kaffey Zipporah Y. , McKenna Tyler J. , Moore Angelina B. , Noble Abigail T. , Patel Simoni , Rivera Ana S. , Sapinsley Joshua , Sasso Elena G. , Sevald Paige , Smith Kay A.K. , Rocus Sara M. , Schjerven William S. , Kharas Gregory
Published: February 2021

Novel trisubstituted ethylenes, methyl and methoxy ring-trisubstituted 2-methoxyethyl phenylcyanoacrylates, RPhCH=C(CN)CO2CH2CH2OCH3 (where R is 2,3-dimethyl-4-methoxy, 2,5-dimethyl-4-methoxy, 2,4-dimethoxy-6-methyl, 3,5-dimethoxy-4-hydroxy, 4-hydoxy-3,5-dimethyl, 2,3,4-trimethoxy, 2,4,5-trimethoxy, 2,4,6-trimethoxy, 3,4,5-trimethoxy) were prepared and copolymerized with styrene. The ethylenes were synthesized by the piperidine catalyzed Knoevenagel condensation of ring-substituted benzaldehydes and 2-methoxyethyl cyanoacetate, and characterized by CHN analysis, IR, 1H and 13C NMR. All the ethylenes were copolymerized with styrene in solution with radical initiation (ABCN) at 70°C. The compositions of the copolymers were calculated from nitrogen analysis.
Mixed Chirality α-Helix in a Stapled Bicyclic and a Linear Antimicrobial Peptide Revealed by X-Ray Crystallography
Authors: Baeriswyl stéphane , Personne Hippolyte , Di Bonaventura Ivan , Köhler Thilo , van Delden Christian , Stocker Achim , Javor Sacha , Reymond Jean-Louis
Published: February 2021

The peptide α-helix is right-handed when containing amino acids with L-chirality, and left-handed with D-chirality. What happens in between is largely unknown, however α-helices have not been reported with mixed chirality sequences unless a strong non-natural helix inducer such as amino-isobutyric acid was used. Herein we report the discovery of a membrane disruptive amphiphilic antimicrobial undecapeptide containing seven L- and four D-residues forming a stable right-handed α-helix in stapled bicyclic and linear forms. The α-helical fold is evidenced by X-ray crystallography and supported in solution by circular dichroism spectra as well as molecular dynamics simulations. The linear mixed chirality peptide is as active as the L-sequence against multidrug resistant bacteria but shows no hemolysis and full stability against serum proteolysis. Searching for mixed chirality analogs preserving folding might be generally useful to optimize α-helical bioactive peptides.
Spherical Neutralizing Aptamer Inhibits SARS-CoV-2 Infection
Authors: Sun Miao , Liu Siwen , Song Ting , Chen Fude , Zhang Jialu , Huang Jiaao , Wan Shuang , Lu Yao , Chen Honglin , Tan Weihong , Song Yanling , Yang Chaoyong
Published: February 2021

New neutralizing agents against SARS-CoV-2 and the associated mutant strains are urgently needed for the treatment and prophylaxis of COVID-19. Herein, we develop a spherical cocktail neutralizing aptamer-gold nanoparticle (SNAP) to synergistically block the interaction of SARS-CoV-2 receptor-binding domain (RBD) and angiotensin-converting enzyme-2 (ACE2). Taking advantage of the simultaneous recognition of multi-homologous and multi-heterogenous neutralizing aptamers and dimensionally matched nano-scaffolds, the SNAP exhibits increased affinity to the RBD with a dissociation constant value of 5.46 pM and potent neutralization against authentic SARS-CoV-2 with a half-maximal inhibitory concentration of 142.80 aM. Additional benefits include the multi-epitope blocking capability of the aptamer cocktail and the steric hindrance of the nano-scaffold, which further covers the ACE2 binding interfaces and affects the conformational transition of the spike protein. As a result, the SNAP strategy exhibits broad neutralizing activity, almost completely blocking the infection of N501Y and D614G mutant strains. Overall, the SNAP strategy provides a new direction for development of anti-virus infection mechanisms, both to fight the COVID-19 pandemic and serve as a powerful technical reserve for future unknown pandemics.
Total Synthesis, Isolation, Surfactant Properties, and Biological Evaluation of Ananatosides and Related Macrodilactone-Containing Rhamnolipids
Authors: Cloutier Maude , Prévost Marie-Joëlle , Lavoie Serge , Feroldi Thomas , Piochon Marianne , Groleau Marie-Christine , Legault Jean , Villaume Sandra , Crouzet Jérôme , Dorey Stéphan , Dìaz De Rienzo Mayri Alejandra , Déziel Eric , Gauthier Charles
Published: February 2021

Rhamnolipids are a specific class of microbial surfactants, which hold great biotechnological and therapeutic potential. However, their exploitation at the industrial level is hampered because they are mainly produced by the opportunistic pathogen Pseudomonas aeruginosa. The non-human pathogenic bacterium Pantoea ananatis is an alternative producer of rhamnolipid-like metabolites containing glucose instead of rhamnose residues. Herein, we present the isolation, structural characterization, and total synthesis of ananatoside A, a 15-membered macrodilactone-containing glucolipid, and ananatoside B, its open-chain congener, from organic extracts of P. ananatis. Ananatoside A was synthesized through three alternative pathways involving either an intramolecular glycosylation, a chemical macrolactonization or a direct enzymatic transformation from ananatoside B. A series of diasteroisomerically pure (1®2), (1®3), and (1®4)-macrolactonized rhamnolipids were also synthesized through intramolecular glycosylation and their anomeric configurations as well as ring conformations were solved using molecular modeling in tandem with NMR studies. We show that ananatoside B is a more potent surfactant than its macrolide counterpart. We present evidence that macrolactonization of rhamnolipids enhances their cytotoxic and hemolytic potential, pointing towards a mechanism involving the formation of pores into the lipidic cell membrane. Lastly, we demonstrate that ananatoside A and ananatoside B as well as synthetic macrolactonized rhamnolipids can be perceived by the plant immune system, and that this sensing is more pronounced for a macrolide featuring a rhamnose moiety in its native 1C4 conformation. Altogether our results prove that macrolactonization of glycolipids can dramatically interfere with their surfactant properties and biological activity.