Design and Development of a Class EF2 Inverter and Rectifier for Multi-megahertz Wireless Power Transfer Systems

This paper presents the design and implementation of a Class EF2 inverter and Class EF2 rectifier for two -W wireless power transfer (WPT) systems, one operating at 6.78 MHz and the other at 27.12 MHz. It will be shown that the Class EF2 circuits can be designed to have beneficial features for WPT applications such as reduced second-harmonic component and lower total harmonic distortion, higher power-output capability, reduction in magnetic core requirements and operation at higher frequencies in rectification compared to other circuit topologies. A model will first be presented to analyze the circuits and to derive values of its components to achieve optimum switching operation. Additional analysis regarding harmonic content, magnetic core requirements and open-circuit protection will also be performed. The design and implementation process of the two Class-EF2-based WPT systems will be discussed and compared to an equivalent Class-E-based WPT system. Experimental results will be provided to confirm validity of the analysis. A dc-dc efficiency of 75% was achieved with Class-EF2-based systems

ANAK-ANAK MEMBAGIKAN PENGALAMAN; PRAKTIK DIGITAL DI KOMUNITAS

Adapun tujuan dari penelitian ini adalah untuk mendapatkan pengetahuan tentang praktik digital yang dilakukan oleh anak-anak dalam suatu komunitas. Pertanyaan penelitian yang memandu penelitian ini adalah; bagaimana pelaksanaan praktik digital anak dalam suatu komunitas? Penelitian ini dilakukan dengan pendekatan studi literatur, pada 19 artikel jurnal ilmiah yang terindeks. Studi ini menghasilkan studi empiris yang dapat digunakan sebagai acuan dalam memahami penggunaan teknologi digital pada anak-anak. Penerapan teknologi digital dapat mempererat hubungan dengan sesama anggota komunitas. Temuan utama yaitu terdapat empat partisipasi anak-anak dalam penggunaan teknologi digital, yaitu; partisipasi dikarenakan persahabatan, minat, berbasis pengetahuan dan kinerja serta pentingnya pengawasan dalam penerapan literasi digital

Special Article: Physical Activity, Physical Fitness, and Cardiovascular Risk Factors in Childhood

In adults, physical activity and exercise training are associated with reduced cardiovascular morbidity and mortality, a reduced likelihood of developing adverse cardiovascular risk factors, and improved insulin sensitivity. In childhood, participation in appropriate physical activity may prevent the development of cardiovascular risk factors in the future and complement treatment of existing cardiovascular risk factors, including hypertension, dyslipidemia, and overweight. Exercise in children can also significantly improve insulin sensitivity independent of weight loss. These e fects are mediated in overweight children by increases in lean body mass relative to fat mass and associated improvements in inflammatory mediators, endothelial function, and the associated adverse hormonal milieu

Cooperation between interleukin-5 and the chemokine eotaxin to induce eosinophil accumulation in vivo.

Experiments were designed to study the effect of systemically administered IL-5 on local eosinophil accumulation induced by the intradermal injection of the chemokine eotaxin in the guinea pig. Intravenous interleukin-5 (IL-5) stimulated a rapid and dramatic increase in the numbers of accumulating eosinophils induced by i.d.-injected eotaxin and, for comparison, leukotriene B4. The numbers of locally accumulating eosinophils correlated directly with a rapid increase in circulating eosinophils: circulating eosinophil numbers were 13-fold higher 1 h after intravenous IL-5 (18.3 pmol/kg). This increase in circulating cells corresponded with a reduction in the number of displaceable eosinophils recovered after flushing out the femur bone marrow cavity. Intradermal IL-5, at the doses tested, did not induce significant eosinophil accumulation. We propose that these experiments simulate important early features of the tissue response to local allergen exposure in a sensitized individual, with eosinophil chemoattractant chemokines having an important local role in eosinophil recruitment from blood microvessels, and IL-5 facilitating this process by acting remotely as a hormone to stimulate the release into the circulation of a rapidly mobilizable pool of bone marrow eosinophils. This action of IL-5 would be complementary to the other established activities of IL-5 that operate over a longer time course

Analisis Nilai-nilai Budaya Karia Dan Implementasinya Dalam Layanan Bimbingan Dan Konseling

Tujuan penelitian ini adalah untuk mengetahui (1) gambaran nilai-nilai budaya karia. (2) Implikasi budaya karia dalam layanan bimbingan dan konseling. Teknik analisis data dalam penelitian ini adalah analisis data deskriptif, dan analisis observasi. Subjek penelitian ini yaitu tokoh adat, remaja yang akan melaksanakan budaya karia, remaja yang telah melaksanakan karia, dan ahli Bimbingan dan Konseling. Hasil penelitian ini mengemukakan (1) lima nilai utama budaya karia yang diuraikan ke dalam prosesi budaya karia antara lain: kafoluku (pemahaman diri dan tingkah laku), kabhansule (pemahaman peran), kalempagi (pertumbuhan dan perkembangan), katandano wite (rendah hati dan amanah), dan linda (aktualisasi diri). (2) Implikasi nilai-nilai budaya karia dalam layanan bimbingan dan konseling dalam penelitian ini teridentifikasi dalam bentuk layanan dasar bidang bimbingan keluarga

RESPONS AKUT KADAR GULA DARAH AKIBAT LATIHAN “SENAM DIABETES MELLITUS VERSI JAKARTA” DAN SENAM DIABETES MELLITUS VERSI JOGJA PADA PENDERITA DIABETES MELLITUS

By the rapid development of science and technology, the development in the economic sector and uncontrolled healthy life patterns can cause serious diseases. Degenerative diseases have replaced chronic diseases. The prominent degenerative diseases these days are heart disease, hypertension, and diabetes mellitus. The diseases are caused by unhealthy life style, diet, and less physical activity. Minor diabetes mellitus can be controlled through diet and exercise programs, and if the programs do not work, the patients can consume anti-diabetes medicines. The patients who perform the exercise experience the decrease of the needs of insulin until 40%. This is an experimental research study using Randomized pre-test post-test Design. The populations involved in this study were patients of diabetes mellitus which were the members of diabetes mellitus exercise fitness program in dr. Sardjito Hospital, Yogyakarta. The samples were 12 participants which were divided into two groups. The tool used in this research was One Touch BASIC Plus Life Scan 2000 made in USA. The results of this study show that there were different decreases of blood sugar levels as the effect of treatment of Senam Diabetes Mellitus Versi Jakarta and Senam Diabetes Mellitus Versi Jakarta Dan Versi Jogja (Jakarta and Jogja Versions of Diabetes Mellitus Exercise). The stressors of Jakarta version of diabetes mellitus exercise could stimulate the decrease of sugar blood levels (pre-post) of 15mg/100ml in average, while the stressors of Jogja version of diabetes mellitus exercise could stimulate the decrease of sugar blood level (pre-post) of 20.83mg/100ml in average. Statistically, the results show that t count was 0.913 with the probability level of 0.403 (p>0.05). Thus, statistically the levels of sugar blood before and after performing Jakarta version of diabetes mellitus exercise were relatively similar. It implies that Jakarta version of diabetes mellitus exercise was not effective to decrease the acute levels of sugar blood. The results of t-test on the group of Jogja version of diabetes mellitus exercise show that t count was 2.016 with the probability level of 0.100 (p>0.05). It implies that the levels of sugar blood before and after performing Jogja version of diabetes mellitus exercise were relatively similar. Therefore, it was said that Jogja version of diabetes mellitus exercise could not effectively decrease the levels of sugar blood. Keywords: acute response, diabetes mellitus, sugar bloo

Fast synchrotron X-ray tomographic quantification of dendrite evolution during the solidification of Mg-Sn alloys

The evolution of dendritic microstructures during the solidification of a Mg-15 wt%Sn alloy was investigated in situ via fast synchrotron X-ray microtomography. To enable these in situ observations a novel encapsulation method was developed and integrated into a fast, pink beam, imaging beamline at Diamond Light Source. The dendritic growth was quantified with time using: solid volume fraction, tip velocity, interface specific surface area, and surface curvature. The influence of cooling rate upon these quantities and primary phase nucleation was investigated. The primary dendrites grew with an 18-branch, 6-fold symmetry structure, accompanied by coarsening. The coarsening process was assessed by the specific surface area and was compared with the existing models. These results provide the first quantification of dendritic growth during the solidification of Mg alloys, confirming existing analytic models and providing experimental data to inform and validate more complex numeric models

UPAYA PENINGKATAN KETERAMPILAN MENULIS RESENSI MAHASISWA PENDIDIKAN BAHASA DAN SASTRA INDONESIA DENGAN PENERAPAN PENDEKATAN PROSES

Penelitian ini bertujuan untuk meningkatkan keterampilan mahasiswa dalam menulis resensi ditinjauk dari aspek kebahasaan, penalaran, maupun muatan isisnya dan untuk meningkatkan proses pembelajaran menulis resensi. Penelitian ini dil;aksanakan dalam bentuk penelitian tindakan kelas dengan dua siklus. Kedua siklus tersebut dilaksanakan pada jam perkuliahan Menulis Karya Ilmiah yaitu sejak bulan Maret s.d. Juli 2006. Subjek penelitian ini adalah mahasiswa Program Studi Pendidikan Bahasa dan Sastra Indonesia angkatan 2004/2005 kelas A yang berjumlah 17 mahasiswa. Pengambilan data dilakukan dengan tes, wawancara, dan observasi. Instrumen yang digunakan dalam penelitian ini adalah pedoman penilaian, pedoman penyekoran, angket, dan lembar observasi. Dengan teknik partisipasi kolaboratif, peneliti melakukan perencanaan, implementasi tindakan, pemantauan, dan evaluasi secara spiral berkelanjutan. Refleksi tindakan digunakan sebagai bekal pemberian tindakan yang dilakukan peneliti pada siklus berikutnya. Validitas penelitian tindakan dalam penelitian ini dicapai dengan trianggulasi. Adapun untuk mencapai reliabilitas penelitian ini, penggunaan alat evaluasi dilengkapi dengan pedoman penilaian dan pedoman penyekoran. Indikator keberhasilan penelitian ini adalah ketika keterampilan menulis resensi mahasiswa sudah meningkat yang ditandai dengan peningkatan nilai akhir untuk tugas resensi. Berdasarkan hasil penelitian, diketahui bahwa sebelum diberi tindakan rata-rata nilai adalah 59,00, nilai tertinggi 76 dan nilai terendah 24. Setelah diberi tindakan, yaitu pada siklus pertama, rata-rata nilai 76,69, nilai tertinggi 88, dan nilai terendah 44. Setelah diberi tindakan kedua, rata-rata nilai untuk resensi mahasiswa adalah 83,88, nilai tertinggi 94, dan nilai terendah 65. Hal itu menunjukkkan bahwa keterampilan menulis resensi mahasiswa telah mengalami peningkatan yang cukup signifikan antara sebelum diberi tundakan dan sesudah diberi tindakan. Hal itu berarti bahwa penggunaan pendekatan proses pada siklus pertama dan kedua cukup memberikan peningkatan terhadap keterampilan menulis resensi mahasiswa. Sementara itu, berdasarkan hasil penelitian dapat diketahui pula bahwa dengan penerapan pendekatan proses, mahasiswa lebih antusias bertanya kepada dosen kepada teman dan tampak bersedia memberi atau menerima masukan dari temannya. Hal ini juga menunjukkan juga bahwa pendekatan proses mampu meningkatkan proses pembelajaran menulis resensi. Dengan demikian, dapat dikatakan bahwa penerapan pendekatan proses mampu meningkatkan keterampilan menulis resensi mahasiswa serta mampu meningkatkan proses belajar mengajar menulis karya ilmiah khususnya resensi. Kata kunci: menulis, resensi, pendekatan proses FBS, 2006 (PEND. BHS & SASTRA INDONESIA

Exercise and Coronary Atherosclerosis: Observations, Explanations, Relevance, and Clinical Management.

Physical activity and exercise training are effective strategies for reducing the risk of cardiovascular events, but multiple studies have reported an increased prevalence of coronary atherosclerosis, usually measured as coronary artery calcification, among athletes who are middle-aged and older. Our review of the medical literature demonstrates that the prevalence of coronary artery calcification and atherosclerotic plaques, which are strong predictors for future cardiovascular morbidity and mortality, was higher in athletes compared with controls, and was higher in the most active athletes compared with less active athletes. However, analysis of plaque morphology revealed fewer mixed plaques and more often only calcified plaques among athletes, suggesting a more benign composition of atherosclerotic plaques. This review describes the effects of physical activity and exercise training on coronary atherosclerosis in athletes who are middle-aged and older and aims to contribute to the understanding of the potential adverse effects of the highest doses of exercise training on the coronary arteries. For this purpose, we will review the association between exercise and coronary atherosclerosis measured using computed tomography, discuss the potential underlying mechanisms for exercise-induced coronary atherosclerosis, determine the clinical relevance of coronary atherosclerosis in middle-aged athletes and describe strategies for the clinical management of athletes with coronary atherosclerosis to guide physicians in clinical decision making and treatment of athletes with elevated coronary artery calcification scores

Upaya Meningkatkan Prestasi Belajar IPA Materi Siklus Makhluk Hidup Melalui Metode Bekerja Berpasangan Pada Siswa Kelas IV SD Negeri Jatigembol 2 Kedunggalar Semester Genap Tahun Pelajaran 2018/2019

Sampai saat ini dalam pembelajaran IPA siswa hanya bisa menghafal konsep yang dipelajarinya, tetapi siswa kurang mampu untuk menghubungkan antara apa yang mereka pelajari dengan bagaimana pengetahuan tersebut akan dimanfaatkan. Rumusan masalah dalam penelitian ini adalah: Apakah dengan diterapkannya metode Bekerja Berpasangan dapat meningkatkan hasil belajar siswa pada materi siklus makhluk hidup. Adapun Tujuan yang ingin dicapai dalam kegiatan belajar melalui metode Bekerja Berpasangan adalah membantu siswa dalam kegiatan belajar agar bisa berfikir secara cepat dan melatih ketelitian, kecerdasan serta kecermatan dengan waktu yang  di tentukan. Metode yang digunakan dalam penelitian ini adalah Penelitian Tindakan Kelas (PTK) dengan siklus berdaur, yaitu siklus di ulangi jika tujuan yang dirumuskan belum dicapai secara optimal. Setiap siklus pembelajaran terdiri dari empat tahapan: (1) perencanaan, (2) Pelaksanaan,(3) Pengamatan (observastion), dan (4) Refleksi. Hasil penelitian menunjukan bahwa pembelajaran IPA melalui penggunaan metode Bekerja Berpasangan ternyata dapat meningkatkan hasil belajar siswa, pada setiap tindakan mengalami peningkatan yang cukup baik sehingga hasil belajar siswa meningkat yaitu pada siklus I Peserta didik yang tuntas mencapai kriteria ketuntasan minimal (KKM) sebanyak 18 orang siswa atau sebanyak 59,4% sedangkan Peserta didik yang belum mencapai kriteria ketuntasan minimal (KKM) sebanyak 17 orang siswa atau sebanyak 40,6%. Sedangkan pada siklus II mengalami peningkatan hasil belajar siswa yaitu sebanyak 27 siswa atau sebesar 89,1% tuntas dan sebanyak 8 siswa atau sebesar 9,9% belum tuntas. Dengan demikian, penggunaan metode Bekerja Berpasangan sangat menunjang terhadap hasil belajar siswa pada materi siklus makhluk hidup di kelas IV SD Negeri Jatigembol 2 KedunggalarTahunPelajaran 2018/2019