bluuebunny/crossref_metadata_2025 huggingface dataset:
Analisa Kadar Logam Berat Merkuri (Hg) Pada Krim Pemutih Yang Beredar Di Daerah Percut Sei Tuan Sampali Secara Spektrofotometri Serapan Atom (SSA)
Authors: Harmawan Tisna , Irmawati Ade
Published: January 2019

Several researches have been conducted about "Analysis of Heavy Metal Content Mercury (Hg) On Whitening Face Cream Circulating On Percut Sei Tuan Sampali area with Atomic Absorption Spectrophotometer (AAS)". The research study was run at the Health Central Laboratory of North Sumatra. This study aimed to determine the levels of mercury (Hg) in the whitening face creams that ciirculating in the Percut Sei Tuan Sampali district. It also need to determine the levels of mercury (Hg) from Percut Sei Tuan Sampali area that accordance with the Regulation No. HK.03.1.23.07.11.6662 POM. However, this was an experiment study with a random of 5 samples among the whitening face cream at Percut Sei Tuan Sampali area. Thus, this area presented that the heavy metal mercury (Hg) from 5 samples were obtained the results that samples 1A was 1.5429 mg / L, samples 2A is 1.5334 mg / L, samples 3A is 1.4851 mg / L, samples 4A is 1.4916 mg / L, the sample 5A is 1, 5180 mg / L. However, the results showed that the mercury (Hg) value was above the levels was determined by BPOM RI, (the permission terms of heavy metal contamination Mercury (Hg) 1 mg / L No. HK.03.1.23.07.11.6662 in 2011). Thus, it was necessary to supervise the facial whitening cream in the Percut Sei Tuan Sampali society.
Penerapan Model Contextual Teaching And Learning Untuk Meningkatkan Kemampuan Mendeskripsikan Fabel Pada Siswa Kelas VIII-6 SMP Negeri 2 Peusangan Bireuen
Authors: Asma Nur , Insya Muhammad
Published: January 2019

The problem studied was how the application of the CTL model could improve the ability to describe a fable in Class VIII-6 of SMPN 2 Peusangan. This study aimed to improve the ability to describe a fable in the class through the CTL model. The benefit of this research included improving fable describing ability on Class VIII-6 students of SMP Negeri 2 Peusangan through the application of the CTL model. The approaches used in this study were the qualitative research and the Class Action Research (PTK). Data collected in the study came from the pre-test and post test, observation, interviews, and field notes. The results showed that the implementation of narrative essay writing with the CTL approach could increase the activities of teachers and students. The results of observations of the teachers and students activities in the implementation of the cycle I action obtained and average percentage of 80.4%. However, in terms of the results, the implementation of the first cycle of action had not been successful because the students obtained the value of â‰¥ 65 were 68.6%, with 56% of class completeness. Thus, the researcher conducted a repetition cycle. The results of observations of teachers and students in the second cycle of action earned the average percentage of 84.2%, and reached 88% of classical completeness. Moreover, in terms of the results, the implementation of the second cycle showed that teaching narrative essay writing by applying the CTL model could improve students' writing on the fable describing materials. This can be seen from the percentage of the students who received â‰¥ 65 classically were 88%, with the class average of 84.2. Therefore, the CTL model used could increase the activities of teachers and students in fable describing in Class VIII-6 students of SMP Negeri 2 Peusangan, Bireuen district.

Kata Kunci: CTL, Fabel.
Optimalisasi Metode Electroplatting Koagulasi Terhadap Penurunan Kadar Logam Zinkum (Zn) Pada Air Buangan Limbah Industri Pengolahan Karet
Authors: Harahap Muhammad Ridwan , Nasution Abdul Chalik , Aritonang Sri Pratiwi
Published: January 2019

Penelitian tentang penggunaan metode electroplatting koagulasi untuk menurunkan konsentrasi logam Zn dalam air limbah industri karet telah dilakukan. Limbah yang digunakan memiliki karakteristik kontaminan Zn 1.2771 mg/L. Percobaan dilakukan dengan tegangan listrik 12 Volt, kuat arus 10 A, variasi waktu 0, 15, 30, 45, sampai 60 menit, variasi pH limbah 4, 7,dan 8, karakteristik plat elektroda dengan panjang 10 cm, lebar 2 cm dan ketebalan 0,5 mm, serta volume sampel sebanyak 1 liter dalam keadaan statis. Analisis Zn pada hasil akhir digunakan Spektrofotometer Serapan Atom (SSA). Hasil penelitian menunjukkan penurunan konsentrasi logam Zn pada pH 7 dengan waktu kontak 60 menit, yakni sebesar 99,56 %.

Kata Kunci: electroplatting, koagulasi, zinkum, limbah, industri karet.
Analisa Perbandingan Switch Mode Power Supply (SMPS) dan Transformator Linear Pada Audio Amplifier
Authors: Cholish Cholish , Rimbawati Rimbawati , Hutasuhut Abdul Aziz
Published: January 2019

The Advantages of electronics equipment requires the increased efficiency and technology to reduce the use of electrical energy. The electrical equipment in residential energy consumption is the dominant burden on electricity supply service. Audio Amplifier is a widely used household appliance in general based on the linear transformer. A Linear transformer has much deficiency such as dimensions of equipment and the use of technology control systems which less of good and large voltage drop. Because of that, the design of Switch Mode Power Supply (SMPS) model would be a replacement linear transformer. In this research, we will compare the performance of Linear Trafo with SMPS specification +/- 35VDC - 350W. By making modifications to SMPS on the transformer windings which could be seen as the significant comparison to the use of equipment.
Cytotoxic Activity of Aporphine Alkaloids from Alseodaphne Peduncularis (Wall. Ex. Ness) Meissn against Hela Cell Line
Authors: Amna Ulil , Ahmad Kartini , Nafiah Mohd Azlan
Published: January 2019

Genus of Alseodaphne has been known as a source of apoprhine alkaloid that displayed potent cytotoxic activities against selected cell lines. Two aporphine alkaloids, Corydine 1 and norlirioferine 2 were isolated from leaves of Alseodaphne peduncularis (Wall. Ex. Ness) Meissn. (Lauraceae). Phytochemical study involved extraction, separation and purification by using various chromatography methods and structural elucidation by using spectoscopic techniques such as UV, IR LC-MS and 1D and 2D NMR. These compounds were then assayed for cytotoxicity against human uteric cervical tumor (heLa) and compare for safety with normal mouse fibroblast (NIH/3T3) cell lines by using the MTT assay. Compound 2 displayed potent cytotoxic activities against heLa cell, but compound 1 showed as inactive. Both compounds have no significant effect against NIH/3T3 cell lines indicated good for cancer agent treatment.
Student Project Management With Project-Based Learning: A Preliminary Study in The Polytechnic Malaysia
Authors: Sadrina Sadrina , Lassim Mohammad Mohd. , Ichsan Muhammad
Published: January 2019

Finishing the project are the main task for last semester students in Polytechnic. They do the project in order finishing the syllabus without any improving skills for their future work in industry. The common educational system has improved the quantity of graduate but not the quality. Many industrial department dissatisfied with the workforce less of soft skills although they have enough hardskills in their field. Technical and vocational education has given an opportunity for students to develop their interested in technical and vocational program. Project Based Learning (PjBL) is one the various learning based on student oriented learning. Project-Based Learning is a student-centered learning approach based on the principles of constructivism to enhance studentsâ€™ learning and creativity by solving a real-world problem. The purpose of this study was to asses the project management system by using Project-Based Learning. This study was held at Mechanical Engineering department at Polytechnic Kota Bharu, Malaysia. We used a set of questionnaire and observation into this research. We found Project-Based Learning are suitable for student project management. PjBL has improve students softskill such as communication skills, work in team, solving problem and creative. Futher application of this study will lead to the development of Project-Based Learning implement in other institution to improve student management project.
Perancangan Interface Aplikasi Pengaduan Masyarakat Kepada Kepolisian
Authors: Alkaf Said Ammar , Basrul Basrul , Mursyidin Mursyidin
Published: January 2019

Based on the results of the analysis conducted by the researchers, there are many unpredictable things like traffic accidents, robbery, theft case and others. This study aims to facilitate the community in reporting the unexpected events of each individual. The designed app will later give you an idea of which system will be used by the community to report instances that are experienced easily and quickly. This research uses prototyping method. This research is done by collecting the data needed to create an application design that can be used to disrupt the application. Data obtained for further processing can be obtained so that a design can be used as a picture when the application will be implemented.
Penggunaan Metode Problem Based Instruction (pbi) Untuk Meningkatkan Hasil Belajar dan Motivasi Siswa Pada Materi Pengukuran Nilai Resistor Kelas X Di SMK Negeri 1 Darul Kamal Aceh Besar
Authors: Yulidatullah Yulidatullah , Silahuddin Silahuddin , Sadrina Sadrina
Published: January 2019

Based on the observation result, the learning system applied in SMK Negeri 1 Darul Kamal Aceh Besar, is more dominated by conventional learning. Therefore, the student activity tends to be passive. However, in the process of learning the student is less understanding the material provided by the teacher. One of the alternatives to solving the problem is by offering a PBI learning method. The purpose of this research is to know the improvement of student learning motivation after learning by using PBI learning method. This research was carried out on November 13-15, 2017. The design of this research uses a real experimental research design. The population in this study is all students of SMKN 1 Darul Kamal which amount to 198 students, while the sample in this research is 22 students of class X Electronics. Technique of collecting data used observation and motivation questionnaire. Observation results showed significant improvement using RPP I, RPP II and RPP III, both observing the ability of teachers to manage learning and student activity observation. Teacher observation results at first meeting with total value of 80.62%, at second meeting with 81.85% and third meeting result increasing up to 85%. Similarly, student activity observation result from 76.42%, to 79.28%, even up to 84.28%. The result of the research by using motivation questionnaire shows that the average value of experimental class is 87,4%. Based on the result of the research, it can be concluded that the use of learning method of PBI can increase students' motivation to learn "resistor value measurement" in class X Electronic SMKN 1 Darul Kamal Aceh Besar.
Electrical Safety in the farm: Case Study Research at Michigan USA 2010
Authors: Fathurrahman Fathurrahman
Published: January 2019

Electrical safety concern has been rise from early utilization of electricity. This report is about electrical accident that took place in one agricultural farm in Michigan, USA in summer 2010. A bilingual Latino farm worker (28) was electrocuted in a 6000-acre potato farm when he touched one of tower of self-propelled central pivot irrigators, which is irrigating the farm at that time. The delta corner-grounded system is used at the farm. The multicultural environment is also escalated the risk.
Perancangan Filter LCL Pada Penyearah Terkendali Satu Fasa Full Converter
Authors: Lastya Hari Anna
Published: January 2019

Abstrak

Perkembangan elektronik yang dewasa ini cukup pesat telah menghasilkan banyak peralatan elektronik baik untuk kebutuhan rumah tangga, perkantoran maupun industri. Umumnya peralatan ini membutuhkan catu daya sumber tegangan arus searah, sementara catu daya yang tersedia merupakan sumber tegangan arus bolak balik. Oleh karena itu, dibutuhkan konverter ac-dc yang berfungsi mengubah sumber tegangan arus bolak balik yang ada menjadi sumber tegangan arus searah. Namun, pemakaian peralatan konverter ac-dc, menghasilkan distorsi pada bentuk gelombang arus, yang dikenal dengan harmonisa yang dapat mengganggu kerja peralatan listrik lainnya yang terpasang pada sumber tegangan yang sama. Jadi, haruslah diupayakan agar harmonisa yang dibangkitkan oleh konverter ac-dc sekecil mungkin dibawah standar yang diizinkan. Pada penelitian ini hanya meneliti konverter ac-dc berupa penyearah terkendali satu fasa full converter. Banyak metoda yang dapat dilakukan untuk mengurangi harmonisa yang dibangkitkan oleh kedua penyearah ini, salah satu cara adalah dengan menggunakan filter LCL pada sisi inputnya. Pada daya beban sebesar 2 kW, pada penyearah terkendali satu fasa full converter dengan beban RL menghasilkan arus harmonisa ke tiga sebesar 40,36 Ampere, sesudah dipasang filter LCL arus harmonisa ke 3 menjadi 0,02 Ampere. Sedang menurut standard IEC-1000-3-2, arus harmonisa ketiga yang diizinkan adalah sebesar 2,3 Ampere.
Pengembangan DeanLEP Application pada Fakultas Sains dan Teknologi UIN Ar-Raniry Banda Aceh
Authors: Dwitawati Ima
Published: January 2019

The existence of digital technology should be able to provide a positive and productive impact, rather than the passive and negative one. Technology is enabler that facilitates ubiquitous all human activities both for personal gains and for the public and professional interests. This study aims to develop the DeanLEP application of the Faculty of Science and Technology of UIN Ar-Raniry Banda Aceh. DeanLEP is an acronym for Dean Live Event Page Application that is used to assist the dean in monitoring all daily activities and performance in the faculty. Dean LEP Application contains information about the number of lecturers who teach in the current semester and academic year; recapitulation of active students, on leave students and alumni; lecturers' research, lecturers' ranks, employee permits and leave, study center, lecturers with additional assignments, guest lecturers and guest lectures, women's activities, and cooperatives. In addition to dynamic information updated at any time, Dean LEP Application also provides static information such as information on leaders, lecturers, staff, and contract workers of the faculty.
Peningkatan Hasil Belajar Siswa Pada Mata Pelajaran Elektronika Dasar Dalam Materi Hukum Ohm Dengan Menggunakan Metode Demonstrasi Di Kelas X Smk Muhammadiyah 1 Banda Aceh
Authors: Zuyadi Zuyadi , Silahuddin Silahuddin , Anna Lastya Hari
Published: January 2019

The implementation of demonstration methods in productive learning is very influential on the level of student learning success in SMK. The results of observation indicated that many student learning outcomes of SMK were below average. This was caused by teachers who did not apply the demonstration method in the lesson, so it affect their learning ability. This study aims to determine the level of students learning success at class X SMK Muhammadiyah 1 Banda Aceh by applying the methods of demonstration on Basic Electronics subjects. This research is a quantitative research using pre- experiment design method: one-group pretest-posttest design. Data were collected through pretest, posttest and questionnaires. Then the data was processed by using t-test. The results of the study revealed that there are differences in learning outcomes of students of class X SMK Muhammadiyah 1 Banda Aceh between after and before applied methods of demonstration. This can be seen from the average score of student achievement achieved on pretest < posttest (74.5 < 80.5). After analyzed by using the t- test formula obtained t-count = 1.96. While t-table obtained by using dk = n-1, dk = 10-1 = 9 at a significant level of 5%, ie 0.251. Base on the initial hypothesis of this study, it indicated that, if tcount > ttable (1,96> 0,521), Ha is accepted. Thus it can be concluded that the implementation of demonstration methods can improve student learning outcomes of class X SMK Muhammadiyah 1 Banda Aceh.
Optimalisasi Pendidikan Karakter melalui Ekstrakurikuler di SMP Negeri 1 Labuhan Haji Barat Aceh Selatan
Authors: Azimah Azimah
Published: January 2019

Character education is an important aspect in improving the quality of human resources. Poor management of human resources will eventually lead to poor quality of education. The study took place at SMPN (junior high school) 1 Labuhan Haji Barat in Aceh Selatan. Data were obtained from the school principal, vice principal of student affairs, head of administration section, teachers, and students. The data were collected by observation, interview, and documentation. In this study, the instrument was the researcher himself to conduct observation, interview, and documentation. The data were then analyzed through these three following stages; reduction, display, and verification. Findings showed that the main types of extracurricular activities were sports, religious studies, culture and arts, and others (scout, flag raisers, and Olympiad). In addition, the extracurricular activities which helped optimize the character education included playing volleyball, performing congregated prayers, handshaking with teachers, praying before and after studying, Friday cleaning day, being discipline, saying dzikir of tawheed tasawuf, 7-minute speech, observing Islamic days, giving advice and guidance, dancing rapa-i geleng, learning dances, scout, and flag raising. Further, the obstacles in optimizing the character education were related to the internal factors, from the within students themselves and the teachers, and also the external factors such as from the other students and the school facilities.
Istikhdām Kitāb “al-Tațbīq al-Nahwī wa al-Șarfī” bi al-Ṭarīqah al-Qiyāsiyyah fi Ṭārqiyyah Sayṭarah al-Ṭalabah ‘Ala al-Jumlah al-Ismiyyah bi Ma’had Dār al-Ulūm Bandā ‘Atsyīh Indonisiā
Authors: Anwar Kasyful
Published: January 2019

Every “kalam” in Arabic is a sentence “jumlah”. The ability of student to express something in their mind’s, or their heart’s, or convey the idea, or giving information to other, or reading comprehension, or daring to speak with Arabs, or interaction with other is affected by understanding of the “jumlah”. The problem which experienced by student in class Va in Darul Ulum Islamic Boarding School is understanding of “jumlah ismiyah” was still little bit. Therefore, expected to teachers who teach nahwu’s lesson to use a method or a correspond’s book. And name of the book is al-Ṭabīq al-Nuhawil wa al-Șarfi. The aim of this research is to know effectiveness al-Ṭabīq al-Nuhawil wa al-Șarfi book to improve student’s ability in understanding “jumlah ismiyah”. The method used in this research is Quasi Experiment. This study conducted in class five Darul Ulum Islamic boarding school Banda Aceh, Indonesia. The total sample was twenty eight students of class five A. This research found that the use at-Tathbiq an-Nahwi wa as-Sharfi textbook to improve students’ ability in the understanding “jumlah ismiyah” is very effective.
Kinerja Pengasuh dalam Pembinaan Akhlak Anak di Panti Asuhan Yatim Piatu Kinderhut Indonesia
Authors: Masyhur Rifqy
Published: January 2019

Moral is a very important issue in the life of mankind nowadays, especially for children who are still in the growth phase and even more for children who lack attention from their families, such as orphans and broken home children. This is why caregivers in orphanages play a role in fostering the children morals. The purpose of this research was to determine the extent of moral development performed by the caregivers of Kinderhut Indonesia Orphanage in Indrapuri in improving the children's morals.

This field research employed qualitative research approach. Data collection was conducted by interview, observation, and documentation. The data were then analyzed by data reduction, data display, and verification to draw conclusions. The respondents of the research consisted of the head of the orphanage, several caregivers and children residing in the orphanage. The results indicated that first, the ability of the caregivers in developing the childrenâ€™s morals included knowing the nature and characters of the children, communicating well and politely, acting in accordance with religious norms, planning the development program, and being responsible for the children. Second, the coaching methods applied by caregivers were role modeling, habituation, giving advice, storytelling, and promises and punishments. Third, the supporting factors in fostering morals of the children involved a conducive orphanage environment, a religious community environment, and good cooperation between the caregivers and the management of the orphanage. On the other hand, the inhibiting factors were the diverse background of the children and the lack of caregivers. This research is expected to provide benefits to all caregivers in orphanages throughout Indonesia about children's moral development, to the Social Office, to pay more attention to the caregivers in the orphanages, one of which is by providing regular training on the character development of children, and to the universities for sharing knowledge with any caregivers in orphanages and providing enlightenment to them in guiding the morals of children.
Kepemimpinan Kepala Sekolah dalam Pembinaan Guru PAI di SDN Kecamatan Indrajaya Kabupaten Pidie
Authors: Mansuri Mansuri
Published: January 2019

One of the duties of a school principal is to guide teachers. To achieve this duty, a principal employs various approaches and styles of leadership. This study aimed to investigate the implementation of the principals’ leadership in terms of guiding the teachers of Islamic education in the elementary schools in Indrajaya, Pidie. The focuses of the study included the approaches used by the principals in guiding the teachers of Islamic education (i.e., the use of charismatic potential and authority of the principals), the styles used by the principals in guiding the teachers, and the problems faced by the principals in guiding the teachers. The study used descriptive qualitative method. The objects of the study were five elementary schools within Indrajaya. The results showed that the principals applied their charismatic potential and authority when leading the teachers of which the charimastic factor was the predominant one. The principals used participative and authoritarian leadership styles, with the former being the most preferred. Further, there were problems in guiding the teachers, including the preparation of learning instruments, learning innovations, proper assessment, teachers’ personalities, and issues during academic supervision.
Прямые и обратные задачи реконструкции операторов эволюции в анализе динамики многомерных процессов
Authors: Краснов Андрей Евгеньевич , Надеждин Евгений Николаевич , Никольский Дмитрий Николаевич , Галяев Владимир Сергеевич
Published: January 2019

Физические процессы рассеяния электромагнитных волн и процессыпорождения аномалий при передаче информации в сетевых каналах связирассмотрены с единых позиций преобразований многомерных потоков данных соответствующимиоператорами эволюции, действующими как проекционные операторы. Основаниемработы послужили результаты исследований одного из авторов, посвященныезадачам синтеза объемных голографических фильтров для обработки когерентныхоптических сигналов, задачам локации объектов, движущихся в неоднородной среде,а также результаты совместных работ авторов в областизащиты информации, передаваемой по каналам связи. В настоящей работе делаетсяопределенное обобщение результатов данных исследований. Так,поставлена и решена прямая задача реконструкции стационарного оператора эволюции,описывающего упругое рассеяние когерентного электромагнитного поля напространственных неоднородностях стационарной среды. Показано, что сточностью до малых помех, пропорциональных дисперсии неоднородностей среды,оператор эволюции представляется в виде проекционного оператора или активногофильтра угловых (пространственных) частот поля. На основании полученных результатовнеупругое рассеяние нестационарного электромагнитного поля в нестационарной средерассматривается как его преобразование нестационарным оператором эволюции, такжеимеющим вид проекционного оператора или активного фильтра, но преобразующего временныечастоты поля. По аналогии с задачами рассеяния оператор эволюции в виде проекционногооператора, реконструируемого по наблюдаемым сетевым информационным потокам данных,применяется к описанию процессов порождения аномалий припередаче информации в каналах связи. Оператор эволюции используется дляформирования специальных статистик многомерного процесса, которые возможно использоватьдля его последовательного статистического анализа и классификации. Приводятсяпримеры практического использования этих статистик для обнаружения и классификациианомалий сетевого трафика. В частности, проведен вычислительный эксперимент поформированию статистических распределений значений информативных признаковреального трафика и классификации на их основе различных типов сетевых атак.Результатом экспериментальных исследований стало подтверждениеэффективности метода реконструкции оператора эволюции сетевого трафика.
Вопросы суммирования арифметических функций, родственных функции Чебышева
Authors: Деза Елена Ивановна , Варухина Лидия Владимировна
Published: January 2019

Многие вопросы теории чисел связаны с исследованием {\it рядов Дирихле}$f(s)=\sum\limits_{n=1}^{\infty} a_nn^{-s}$ и {\it сумматорных функций} $\Phi(x)=\sum\limits_{n\leq x} a_n$ ихкоэффициентов. Наиболее известным примером ряда Дирихле является {\it дзета-функция Римана} $\zeta(s)$, определенная для любого комплексногочисла $s=\sigma+it$ с действительной частью $\Re s=\sigma> 1$ как$\zeta(s)=\sum\limits_{n=1}^{\infty}\frac{1}{n^s}.$

Квадрат дзета-функции$\zeta^{2}(s)=\sum\limits_{n=1}^{\infty}\frac{\tau(n)}{n^s}, \,\,\Re s >1,$связян с {\it функцией делителей}$\tau(n)=\sum\limits_{d|n}1$, дающей число натуральных делителейнатурального числа $n$. Сумматорной функцией ряда Дирихле $\zeta^2(s)$ является функция $D(x)=\sum\limits_{n\leq x}\tau(n)$, вопросы асимптотической оценки которой известны как {\it проблема делителей Дирихле}.В общем случае,$\zeta^{k}(s)=\sum\limits_{n=1}^{\infty}\frac{\tau_k(n)}{n^s}, \,\,\Re s>1,$ где функция $\tau_k(n)=\sum\limits_{n=n_1\cdot ...\cdot n_k}1$ дает число представлений натурального числа $n$ в виде произведения $k$ натуральных сомножителей. Cумматорной функцией ряда Дирихле $\zeta^k(s)$ является функция $D_k(x)=\sum\limits_{n\leq x}\tau_k(n)$. Ее изучение - это {\it многомерная проблема делителей Дирихле}.

 

Логарифмическая производная $\frac{\zeta^{'}(s)}{\zeta(s)}$ дзета-функции представима ввиде $\frac{\zeta^{'}(s)}{\zeta(s)}=$ $=-\sum\limits_{n=1}^{\infty}\frac{\Lambda(n)}{n^s},$ $\Re s >1.$Здесь $\Lambda(n)$ - {\em функция Мангольдта}, котораяопределяется как $\Lambda(n)=\log p$, если $n=p^{k}$ для простого$p$ и натурального $k$, и как $\Lambda(n)=0$, иначе.Таким образом, {\em функция Чебышева}$\psi(x)=\sum\limits_{n\leq x}\Lambda(n)$является сумматорной функцией коэффициентов ряда Дирихле$\sum\limits_{n=1}^{\infty} \frac{\Lambda(n)}{n^s}$, соответствующегологарифмической производной $\frac{\zeta^{'}(s)}{\zeta(s)}$дзета-функции Римана. Она хорошо известна в аналитической теории чисел и связана со многими классическими задачами, прежде всего, с {\it асимптотическим законом распределения простых чисел}.

В частности, хорошо известно представление функции $\psi(x)$ по нулям дзета-функции:$\psi(x)=x-\sum\limits_{|\Im \rho|\leqT}\frac{x^{\rho}}{\rho}+O\left(\frac{x\ln^{2}x}{T}\right),$ где $x=n+0,5$, $n \in\mathbb{N}$, $2\leq T \leq x$, и $\rho=\beta+i\gamma$ - {\it нетривиальные нули} дзета-функции Римана, то есть нули $\zeta(s)$, лежащие в {\em критической полосе} $0< \Re s<1$.

Мы получаем аналогичные представления, связанные с нетривиальными нулями дзета-функции Римана, для двух арифметических функций, родственных функции Чебышева:$$\psi_{1}(x)=\sum\limits_{n\leq x}(x-n)\Lambda(n) \, \mbox{ и } \,\psi_{2}(x)=\sum\limits_{n \leq x}\Lambda(n)\ln\frac{x}{n}.$$Аналогичные результаты можно получить и для других функций, родственныхфункции Чебышева, если использовать логарифмические производные $L$-функций Дирихле.
О взаимосвязи констант Никольского для тригонометрических полиномов и целых функций экспоненциального типа
Authors: Горбачёв Дмитрий Викторович , Мартьянов Иван Анатольевич
Published: January 2019

Для $0<p<\infty$ мы изучаем взаимосвязь между константой Никольского длятригонометрических полиномов порядка не больше $n$\[\mathcal{C}(n,p)=\sup_{T_{n}\ne 0}\frac{\|T_{n}\|_{\infty}}{\|T_{n}\|_{p}}\]и константой Никольского для целых функций экспоненциального типа небольше~$1$\[\mathcal{L}(p)=\sup_{f\ne 0}\frac{\|f\|_{\infty}}{\|f\|_{p}}.\]

Недавно Е.~Левин и Д.~Любинский доказали, что\[\mathcal{C}(n,p)=\mathcal{L}(p)n^{1/p}(1+o(1)),\quad n\to \infty.\]М.~Ганзбург и С.~Тихонов обобщили этот результат на случай константНикольского--Бернштейна.

Мы доказываем неравенства\[n^{1/p}\mathcal{L}(p)\le \mathcal{C}(n,p)\le (n+\lceilp^{-1}\rceil)^{1/p}\mathcal{L}(p),\quad n\in \mathbb{Z}_{+},\quad 0<p<\infty,\]которые уточняют результат Левина и Любинского. Доказательство следует нашемустарому подходу, основанному на свойствах интегрального ядра Фейера. С помощьюэтого подхода ранее были доказаны оценки при $p=1$\[n\mathcal{L}(1)\le \mathcal{C}(n,1)\le (n+1)\mathcal{L}(1).\]

Данные неравенства позволяют оценить константу $\mathcal{L}(p)$, приближенновычисляя $\mathcal{C}(n,p)$ для больших $n$. Чтобы это сделать мы используемнедавние результаты В.В.~Арестова и М.В.~Дейкаловой, которые выразили константуНикольского $\mathcal{C}(n,p)$ при помощи алгебраического полинома $\rho_{n}$,наименее уклоняющегося от нуля в пространстве $L^{p}$ на отрезке $[-1,1]$ свесом $(1-t)v(t)$, где $v(t)=(1-t^{2})^{-1/2}$~--- вес Чебышева. Как следствие,мы уточняем оценки для константы Никольского $\mathcal{L}(1)$ и находим, что\[1.081<2\pi \mathcal{L}(1)<1.082.\]Для сравнения предыдущие оценки были $1.081<2\pi \mathcal{L}(1)<1.098$.
Об условии удвоения для положительно определенных функций на полуоси со степенным весом
Authors: Горбачёв Дмитрий Викторович , Иванов Валерий Иванович
Published: January 2019

Непрерывные неотрицательные положительно определенные функции удовлетворяютследующему свойству:\[\int_{-R}^{R}f(x)\,dx\le C(R)\int_{-1}^{1}f(x)\,dx,\quad R\ge 1,\tag{$*$}\]где наименьшая положительная константа $C(R)$ не зависит от $f$. При $R=2$ этосвойство хорошо известно как условие удвоения в нуле. Данные неравенства имеютприложения в теории чисел.

В одномерном случае неравенство~($*$) изучалось Б.Ф.~Логаном (1988), а такженедавно А.~Ефимовым, М.~Гаалом и Сц.~Ревешем (2017). Было доказано, что$2R-1\le C(R)\le 2R+1$ для $R=2,3,\ldots$, откуда следует, что $C(R)\sim 2R$.Вопрос о точных константах здесь открыт.

Многомерный вариант неравенства ($*$) для евклидова пространства$\mathbb{R}^{n}$ исследовался Д.В.~Горбачевым и С.Ю.~Тихоновым (2018). Вчастности доказано, что для непрерывных положительно определенных функций$f\colon \mathbb{R}^{n}\to \mathbb{R}_{+}$\[\int_{|x|\le R}f(x)\,dx\le c_{n}R^{n}\int_{|x|\le 1}f(x)\,dx,\]где $c_{n}\le 2^{n}n\ln n\,(1+o(1))(1+R^{-1})^{n}$ при $n\to \infty$. Отсюда нарадиальных функциях получаем одномерное весовое неравенство\[\int_{0}^{R}f(x)x^{n-1}\,dx\le c_{n}R^{n}\int_{0}^{1}f(x)x^{n-1}\,dx,\quad n\in \mathbb{N}.\]

Мы изучаем следующее естественное весовое обобщение данных неравенств:\[\int_{0}^{R}f(x)x^{2\alpha+1}\,dx\leC_{\alpha}(R)\int_{0}^{1}f(x)x^{2\alpha+1}\,dx,\quad \alpha\ge -1/2,\]где $f\colon \mathbb{R}_{+}\to \mathbb{R}_{+}$~--- произвольная четнаянепрерывная положительно определенная функция относительно веса$x^{2\alpha+1}$. Это понятие было введено Б.М.~Левитаном (1951) и означает, чтодля произвольных $x_{1},\ldots,x_{N}\in \mathbb{R}_{+}$ матрица$(T_{\alpha}^{x_i}f(x_j))_{i,j=1}^{N}$ неотрицательно определенная. Здесь$T_{\alpha}^{t}$~--- оператор обобщенного сдвига Бесселя--Гегенбауэра. Левитандоказал аналог классической теоремы Бохнера для таких функций, согласнокоторому $f$ имеет неотрицательное преобразование Ганкеля (в смысле меры).

Мы доказываем, что для каждого $\alpha\ge -1/2$\[c_{1}(\alpha)R^{2\alpha+2}\le C_{\alpha}(R)\le c_{2}(\alpha)R^{2\alpha+2},\quadR\ge 1.\]Нижняя оценка тривиально достигается на функции $f(x)=1$. Для доказательстваверхней оценки мы применяем нижние оценки сумм вида$\sum_{k=1}^{m}a_{k}T^{x_{k}}\chi(x)$, где $\chi$~--- характеристическаяфункция отрезка $[0,1]$, а также свойства свертки Бесселя.
LA ENTREVISTA EN LA INVESTIGACIÓN SOCIAL. UNA PERSPECTIVA DESDE EL ENFOQUE CUALITATIVO
Authors: Satriano Cecilia R.
Published: January 2019

Este trabajo destaca la importancia de la instrumentación metodológica empleada en la investigación sobre los Efectos de la Ley de Protección Integral a Niños, Niñas y Adolescentes en las instituciones públicas (Psicología, Secretaría Ciencia y Tecnología, UNR)[1]. La utilización de esta técnica de indagación respondió a los intereses del proyecto; y posibilitó identificar los aspectos más relevantes de lo generado por la norma. El primer propósito de recurrir a este método fue porque permite establecer una perspectiva y un procedimiento cualitativo. Las entrevistas es un dispositivo que sirve para la construcción de los datos; y permite conocer las opiniones y actitudes de las personas frente a un tema determinado. En este caso, uno de los objetivos fue destacar los aspectos subjetivos de los entrevistados. Esto significó además, establecer un modelo que posibilite una relación entre entrevistador e informante. Se perfiló como una investigación cualitativa, considerando que el investigador es el principal instrumento de recolección y análisis de los datos. Su función es guiar las preguntas que integran los elementos conceptuales que forman el objeto en estudio. La modalidad cualitativa permitió analizar e interpretar las unidades de sentido y la significación de las analogías que se utilizan en su elaboración, mediante los procesos resultantes de la interacción mencionada. Resultados: A partir de la textualización de los testimonios de los entrevistados, se conoció las interpretaciones que se hacen del nuevo modelo de ley.  También las modalidades de las prácticas que se realizan en las instituciones. Obtenido esto, se aplicó el método de comparación constante entre los distintos grupos. [1] El objetivo general de la investigación fue conocer el efecto de esta ley 12967 en las instituciones de Rosario, con el propósito de analizar los cambios que se produjeron a partir de esta implementación, y su evaluación respecto del paradigma anterior.
Sentidos de contrassexualidade e tecnologias corporais nos diálogos de 'Bombadeira' e 'Protagonismo Trans'
Authors: Monica Eder Fernandes
Published: January 2019

Discutem-se os possíveis sentidos de contrassexualidade e os usos de tecnologias corporais com base em discursos das personagens transexuais dos documentários Bombadeira (2007) e Protagonismo Trans (2015). Partindo de uma condução analítica pós-feminista que se vale de Rubin, Butler, Haraway e Preciado, tenta-se identificar sentidos discursivos de contrassexualidade nas falas das personagens. A metodologia baseou-se em análise fílmica, discursiva e bibliográfica.
O horror do corpo em dois contos de Gastão Cruls
Authors: França Júlio
Published: January 2019

O ensaio objetiva refletir sobre os horrores relacionados ao corpo humano, ou, sendo mais específico, sobre os modos como o corpo humano é representado nas narrativas de horror. Para tanto, em um primeiro momento, situa-se a vertente do horror do corpo na tradição das narrativas que exploram o medo como prazer estético, para, em seguida, tomar como demonstração duas narrativas curtas do escritor carioca Gastão Cruls (1888-1959): “G.C.P.A.” (1920) e “O espelho” (1938).
Uji Klirens dan Uji Pirogenitas sebagai Bagian dari Penentuan Mutu Biologi Sediaan 90Y-EDTMP
Authors: Sulaiman Sulaiman , Aguswarini Sri , Karyadi Karyadi , Chairuman Chairuman , Setiawan Gatot , HG Adang , Subur M.
Published: January 2019

Cancer is one of the causes of death in Indonesia and even the world. Nuclear medicine techniques with radiopharmaceuticals and SPECT are one of the ways to treat cancer, but their use in Indonesia is not yet popular. Radiopharmaceuticals marked with radionuclide emitting beta (β) radiation are proven to be used for cancer therapy, one that has been developed in PTRR-BATAN is 90Y-EDTMP. Yttrium-90 is used in nuclear medicine by utilizing β radiation (E max 2.28 MeV). The β energy which is produced from the decay process of 90Y radionuclides to 90Zr can kill cancer cells. This study aimed to provide information about the substances biological effects so that preventive measures can be taken to protect humans. This study conducted evaluation of the 90Y-marked radiopharmaceutical (90Y produced from a 90Sr / 90Y generator which is 90Y-EDTMP) encompasses clearance test, pyrogen test, and dose safety test in experimental animals. The clearance test utilized mice, the pyrogen test utilized rabbits, and the dose safety test utilized mice. The results of the clearance test showed that 90Y-EDTMP compound which was excreted in 192 hour was 49.70% through urine and 14.59% through feces. The total excretion of 90Y-EDTMP within 192 hours was 64.57%. Based on the results of clearance tests with calculations, 90Y of 90Sr / 90Y generators in 90Y-EDTMP dosage form had 84.2 hours of half-life, 36.5 hours of an effective half-life and 52.7 hours of a residence time. Pyrogen test results showed pyrogen-free. The 90Y-EDTMP dose safety test showed that the dose is safe and not deadly. The development of 90Y-EDTMP is expected to be improved to produce radiopharmaceuticals for cancer therapy in order to make a real contribution in public health services.
Control over Coastal Sedimentation Land by the Indonesian Household Migrant Workers
Authors: Septianto Marzuqo
Published: January 2019

This study aims to analyze: 1). power relations over land emerging that occurred in Sugihwaras. 2). Land institutional crisis that becomes the arena of mastery among actors in it, 3). the reason behind the interest of Indonesian Migrant Workers in exploiting land emerging in Sugihwaras. A qualitative approach is applied in this case and data collection is done using observation, interview, and documentation methods. The results show that the power relations of the land arise form the agrarian structure in the society where each actor has a boundary of power and boundle of right are different. The existing institutional land crises in the Community are described in chronological crises of land ownership by actors and their claims to land arising in Sugihwaras. Indonesian Migrant Workers become one of the important actors in relation to access to arising land, where they have access to funds used for land purchase, or building settlements on arising land.
The first case of surgical myocardial revascularization and endarterectomy of the right carotid artery in the same procedure in a patient with haemophilia A
Authors: Jankovic Natasa , Simic Dragan , Mikic Aleksandar , Matkovic Milos , Vukicevic Petar , Elezovic Ivo
Published: January 2019

Introduction. Haemophilia A is the most common hereditary coagulation disturbance occurring due to the lack of coagulation factor VIII. It is widely accepted that people with haemophilia have a reduced incidence of coronary artery disease, potentially because of the protective effect of the impaired coagulation against the pathogenic mechanisms of the acute coronary syndrome. Case report. A 53-year-old man with mild haemophilia [FVIII 22% (mild form: more than 5%?40% of normal)] was hospitalized because of frequent anginal pain at rest. Selective coronary angiography revealed a severe three-vessel coronary disease. A need for urgent surgical revascularization was indicated. The color duplex scan showed the existence of hemodynamically significant stenosis on the right internal carotid artery. After consulting a haematologist, a cardiac surgeon, and a vascular surgeon, it was concluded that due to high bleeding risk, the patient should undergo an endarterectomy of the right carotid artery and a triple aortocoronary bypass in the same procedure. Procedures were performed with a substitution of FVIII concentrate. The patient firstly underwent the endarterectomy of the right carotid artery. Then, the left mammary artery graft was implanted to the left anterior descending artery as well as the venous grafts to the first obtuse marginal artery and posterior descending branch. There were no complications. During the revascularization, there was no need for blood transfusion, nor was there excessive bleeding in the postoperative period. The patient was discharged with antithrombotic therapy (aspirin, 50 mg). Conclusion. Patients with haemophilia are not protected against the development of atherosclerosis. Cardiac surgery in these patients presents a unique challenge for medical teams in securing haemostasis. Adequate substitution with factor VIII concentrate provides adequate haemostasis and the possibility for treatment with antiplatelet therapy.
Mitochondrial Stability in Diabetic Retinopathy: Lessons Learned From Epigenetics
Authors: Kowluru Renu A.
Published: January 2019

Diabetic retinopathy remains the leading cause of acquired blindness in working-age adults. While the cutting-edge research in the field has identified many molecular, functional, and structural abnormalities, the exact molecular mechanism of this devastating disease remains obscure. Diabetic environment drives dysfunction of the power generator of the cell and disturbs the homeostasis of mitochondrial dynamic. Mitochondrial DNA (mtDNA) is damaged, the transcription of mtDNA-encoded genes is impaired, and the electron transport chain is compromised, fueling into a vicious cycle of free radicals. The hyperglycemic milieu also alters the epigenetic machinery, and mtDNA and other genes associated with mitochondrial homeostasis are epigenetically modified, further contributing to the mitochondrial damage. Thus, mitochondria appear to have a significant role in the development of diabetic retinopathy, and unraveling the mechanism responsible for their damage as well as the role of epigenetic modifications in mitochondrial homeostasis should identify novel therapeutic targets. This will have a major impact on inhibiting/halting diabetic retinopathy and preventing the loss of vision.
Farklı Oranlarda Etanol ve Metanol Katkısının Tam Yük Altında Dört Silindirli Dizel Bir Motorun Performans ve Emisyon Değerlerine Olan Etkilerinin Sayısal Olarak İncelenmesi
Authors: AKTAŞ Fatih , KARAASLAN Salih , KILIÇ Merthan , YÜCEL Nuri
Published: January 2019

Dizel motorlarda
farklı oranlarda biyodizel yakıt kullanılması belirli motor çalışma
koşullarında fazla performans kayıplarına yol açmadan egzoz emisyonlarının
azaltılması için oldukça iyi bir yöntemdir. Birçok ülkede ise %5 biyodizel
yakıt katkısı zorunlu hale gelmiştir ve bu oran bazı ülkelerde çok daha
fazladır. Bu çalışmada da dört silindirli dizel bir motorda %5, %10 ve %15
etanol ve metanol katkısının motor performansı ve emisyonlar üzerine olan
etkileri AVL Boost v2018.1 yazılımı kullanılarak incelenmiştir. Analizler
neticesinde elde edilen sonuçlar değerlendirilecek olursa; %5, %10 ve %15
hacimsel oranlarındaki etanol katkısında saf dizel yakıt kullanımına göre
güçteki düşüş oranları sırasıyla maksimum %5, %4 ve %5 iken, aynı hacimsel
orandaki metanol katkılı yakıt karışımında ise bu oranlar %5, %5 ve %8
olmaktadır. Benzer şekilde NOx oluşumunda etanol katkısı ile azalma
oranları maksimum %25, %27 ve %28 değerlerini alırken bu oran metanol katkısı
ile %27, %28 ve %30 şeklinde gerçekleşmiştir. İs oluşumunda ise hem etanol hem
de metanol kullanımında hıza bağlı olarak değişken bir davranış gözlenmiştir.
Effect of Calcium and Fluoride Addition to Hydrogen Peroxide Bleaching Gel On Tooth Diffusion, Color, and Microhardness
Authors: Torres CRG , Zanatta RF , Silva TJ , Borges AB
Published: January 2019

Objectives:

The aim of this study was to evaluate the effect of calcium and fluoride addition to a 35% hydrogen peroxide (HP) bleaching gel with regard to its diffusion through the tooth structure, enamel microhardness, and bleaching efficacy.

Methods and Materials:

Eighty specimens (6 mm in diameter and 2 mm in height; 1 mm/enamel and 1 mm/dentin) were obtained from bovine incisors that were polished and divided into four groups (n=20) according to the remineralizing agent added to the gel: Ca = 0.5% calcium gluconate; F = 0.2% sodium fluoride; Ca+F = 0.5% calcium gluconate and 0.2% sodium fluoride; and control = no agent. Initial microhardness and color were assessed. The samples were positioned over simulated pulpal chambers filled with acetate buffer solution to capture the HP. Gels were applied over enamel for 30 minutes, and HP diffusion was assessed by spectrophotometry two hours after bleaching. Microhardness was measured immediately after bleaching and then the specimens were immersed into artificial saliva for seven days for final color assessment. Data were analyzed by one-way analysis of variance followed by Tukey test.

Results:

Bleaching reduced microhardness for all groups (p=0.0001), but the Ca+F and F groups showed lower reductions after bleaching. The addition of Ca, F, and Ca+F decreased the peroxide penetration through the tooth structure (p=0.0001), but there were no differences in color change for ΔL (p=0.357), Δa (p=0.061), Δb (p=0.823), and ΔE (p=0.581).

Conclusion:

The addition of calcium and fluoride in the gel did not affect bleaching efficacy, but it was able to reduce both the peroxide diffusion and the bleached enamel microhardness loss.
Fabrication and characteristic evaluation of direct metal laser sintered SiC particulate reinforced Ti6Al4V metal matrix composites
Authors: Misra Saurav , Hussain Manowar , Gupta Ankit , Kumar Vikas , Kumar Shakti , Das Alok Kumar
Published: January 2019

The present work deals with the fabrication of silicon carbide (SiC) reinforced Ti6Al4V metal matrix composites (MMC’s) by a direct metal laser sintering process, followed by characterization of microstructures and evaluation of mechanical properties. Variable process parameters like laser power density [3.528–5.172 W/cm2 (×104)], SiC reinforcements (5%–15% by volume), and beam scanning speed (3500–4500 mm/min) and constant process parameters such as spot diameter (0.4 mm), hatching gap (0.2 mm), and layer thickness (0.4 mm) were considered to perform the experiments. The influence of addition of reinforcements on mechanical and physical properties of fabricated samples as compared to Ti6Al4V was examined. Field emission scanning electron microscope images show good metallurgical bonding between reinforcement and matrix. The presence of intermetallic compounds formed during the sintering process was detected by x-ray diffraction, which enhances the mechanical properties of the fabricated samples. Density of sintered samples increased on the increment in laser power density but decreased with an increase in the percentage of SiC in the mixture. Mean value of coefficient of friction was found in the range of 0.157–0.115 in a testing duration of 10 min, showing improvement in the wear resistance property as compared to Ti6Al4V. The improved mechanical properties and surface characteristics result in the formation of effective MMC's for various engineering applications.