Wirelessly Powered Backscatter Communications: Waveform Design and SNR-Energy Tradeoff

This paper shows that wirelessly powered backscatter communications is subject to a fundamental tradeoff between the harvested energy at the tag and the reliability of the backscatter communication, measured in terms of SNR at the reader. Assuming the RF transmit signal is a multisine waveform adaptive to the channel state information, we derive a systematic approach to optimize the transmit waveform weights (amplitudes and phases) in order to enlarge as much as possible the SNRenergy region. Performance evaluations confirm the significant benefits of using multiple frequency components in the adaptive transmit multisine waveform to exploit the nonlinearity of the rectifier and a frequency diversity gain.Comment: submitted for publicatio

OPTIMALISASI LERENG GALIAN BANKO BARAT PIT 2 TAHUN 2016 DI PT. BUKIT ASAM (PERSERO), TBK. UNIT PERTAMBANGAN TANJUNG ENIM, PROVINSI SUMATERA SELATAN

Kestabilan lereng biasanya menjadi masalah yang membutuhkan perhatian yang lebih bagi kelangsungan operasi penambangan setiap harinya, dikarenakan dapat mengganggu aktivitas penambangan dan mengakibatkan kerugian baik dari segi materi maupun sampai memakan korban jiwa. Dalam merancang suatu tambang terbuka, sangat perlu dilakukan suatu analisis terhadap kestabilan lereng untuk memberikan rancangan yang aman dan ekonomis. Optimalisasi analisis kestabilan lereng galian di PT. Bukit Asam (Persero), Tbk. dengan daerah penelitian Banko Barat Pit 2 menggunakan metode Bishop Simplified. Penelitian ini menggunakan Software GeoSlope 2007/Slope W untuk merancang dan mengoptimalkan lereng galian yang aman, dengan memasukkan data sekunder yang didapatkan di PT. Bukit Asam (Persero), Tbk. yaitu rancangan penambangan (desain geometri lereng) dan data-data sifat fisik dan mekanik batuan meliputi density, kohesi, dan sudut geser dalam. Hasil kajian pada optimalisasi menunjukkan bahwa untuk penampang A-A', C-C', dan D-D' masih bisa ditambahkan 3 jenjang. Penampang B-B' ditambahkan 3 jenjang ke bawah. Nilai faktor keamanan (FK) optimalisasi 1 dan 2 didapatkan lereng dalam kondisi stabil, untuk optimalisasi jenjang ketiga (overall slope) nilai FK yang didapatkan dalam kondisi riskan. Penampang E-E' dengan menambahkan 5 jenjang ke bawah. Kelima penampang dalam keadaan stabil

HUBUNGAN PENYAKIT PARU OBSTRUKSI KRONIK (PPOK) TERHADAP RISIKO OBSTRUCTIVE SLEEP APNEA (OSA) DI POLIKLINIK PARU RSUDZA BANDA ACEH

ABSTRAKPenyakit Paru Obstruksi Kronik (PPOK) adalah suatu penyakit dimana terjadinya hambatan udara pada saluran pernapasan yang akan meningkatkan respon inflamasi. Tingkat kekambuhan PPOK akan menyebabkan perburukan kualitas hidup pasien. Di Indonesia, angka kejadian PPOK sebesar 3,7% menjadikan PPOK penyakit kedua terbanyak setelah asma. Beberapa penelitian menunjukkan dimana pasien PPOK mengalami Obstructive Sleep Apnea (OSA) secara bersamaan, yang dapat meningkatkan angka komorbiditas dan mortalitas pasien. Tujuan penelitian ini untuk mengetahui hubungan Penyakit Paru Obstruksi Kronik (PPOK) terhadap risiko Obstructive Sleep Apnea (OSA) di Poliklinik Paru RSUDZA Banda Aceh. Penelitian ini bersifat analitik observational dengan pendekatan cross sectional. Pengambilan sampel secara accidental sampling, didapatkan 30 responden yang menderita PPOK di Poliklinik Paru RSUDZA Banda Aceh. Penelitian ini dilakukan dengan cara mewawancarai responden PPOK menggunakan Kuesioner Berlin. Data diuji dengan menggunakan uji Mann-Whitney dengan nilai p valu

PENGEMBANGAN KARTU KARIR SEBAGAI MEDIA DALAM BIMBINGAN KARIR SISWA SD NEGERI SAMIRONO

Penelitian yang berjudul pengembangan kartu karir sebagai media dalam bimbingan karir siswa SD bertujuan untuk menghasilkan permainan kartu karir sebagai media bimbingan karir yang sesuai dengan karakter dan layak digunakan siswa Sekolah Dasar. Metode penelitian ini adalah penelitian pengembangan. Tahap pengembangan yang dilakukan adalah penelitian awal dan pengumpulan informasi, perencanaan, pengembangan draf produk awal, uji validasi ahli, revisi validasi ahli, uji coba lapangan awal, revisi uji coba lapangan awal, uji coba lapangan utama, revisi hasil uji coba lapangan utama, uji lapangan operasional, dan revisi produk akhir. Setelah melalui tahap pengembangan produk awal maka dihasilkan produk awal yang telah divalidasi oleh ahli materi dan media. Selanjutnya roduk diujicobakan kepada siswa melalui tiga tahap, yaitu uji coba lapangan awal yang terdiri dari 6 siswa, uji coba lapangan utama yang terdiri dari 15 siswa, uji lapangan operasional ang terdiri dari 30 siswa. Subyek uji coba produk adalah siswa kelas I, II, dan III SD Negeri Samirono, Yogyakarta. Data dikumpulkan melalui angket pada saat uji coba. Hasil penelitian ini adalah kartu karir sebagi media bimbingan karir yang layak berdasarkan uji materi dan media. Hasil uji ahli materi yang meliputi 19 item pernyataan terkait dengan kelayakan isi, kebahasaan, penyajian, dan tujuan bimbingan karir, maka diperoleh rata-rata skor 1 dengan kategori baik dan dinyatakan telah layak untuk digunakan. Hasil uji ahli media yang meliputi 47 item pernyataan terkait dengan tampilan desain grafik kartu karir, tampilan fisik kemasan, tampilan desain grafik kemasan, tampilan fisik kartu karir, kemudahan penggunaan, konsistensi, formasi artistik, kemanfaatan, daya dukung, aturan penggunaan, dan logo produsen dengan kategori baik dan dinyatakan telah layak untuk digunakan. Kata kunci: kartu karir, media permainan bimbingan karir

INTERVENSI PELATIHAN PENGENALAN DIRI UNTUK MENINGKATKAN SELF ESTEEM PADA REMAJA PENDERITA THALASSAEMIA

The purpose of this study is to provide new insights self-esteem for participants, and to find outcome increasing participant’s self-esteem after participating in the training. This experimental study was conducted for 6 teenagers with thalassemia who were selected based on the specific characteristics proposed. This study used a pure experimental design without control group. Data were collected through interviews and observations before and before treatment. The intervention provided was in the form of personal recognition training. This treatment uses lecture, discussion, brainstorming, and games with light methods. Lasts for 2 times with a duration of 2.5 hours. In general, almost all people who experience development and able to be creative during the material session, and allow participants to have and be able to be more confident. There was a change in the classification of participants, namely DA, DE, L, S, and W. Meanwhile, there was no change in Lu

ANALISIS PENGARUH KUALITAS PRODUK, KUALITAS LAYANAN DAN STORE ATMOSPHERE TERHADAP KEPUTUSAN PEMBELIAN MELALUI CITRA RESTORAN SEBAGAI VARIABEL INTERVENING (Studi pada Restoran Pondok Ijo Weleri Kendal)

The purpose of this study is to explain the effect of product quality, service quality and restaurant atmosphere to influence purchase decisions, where restaurant image is used as an intervening variable to the purchase decision at Pondok Ijo Weleri Kendal Restaurant. This research is done by taking sample using purposive sampling technique, that is consumers who have visited and bought some food in Pondok Ijo Restaurant at least once with average of age 14 years old up to 40 years and above. Data collection was obtained from 100 consumers of Pondok Ijo Restaurant by giving questionnaires which consist of open questions which is analyzed qualitatively, and the answer of the closed questions were analyzed using Multiple Linear regression method using SPSS 22 program. The results of the analysis show that product quality, service quality and store atmosphere have a positive and significant influence on the restaurant image, then restaurant image has a positive and significant influence on purchase decisions

ELECTROMAGNETIC BASED CMOS-MEMS ENERGY HARVESTING SYSTEM

An Electromagnetic Based CMOS-MEMS Energy Harvesting System can convert kinetic energy which comes from vibration into electrical power. Energy harvesting technique is very promising because no changing batteries or setting cable and wires. Kinetic energy present in various form such as vibrations, random displacements also force can be harvested into electrical energy by using electromagnetic mechanisms. Electromagnetic is suitable since it is more precise, energy efficient, extremely powerful and easier to maintain. Power is generated by means of electromagnetic transduction between a moving coil construct on a CMOS-MEMS structure and a static magnet placed between it. It mainly consists of a proof mass, thin film, coil and also a permanent magnet. Simulation shows that the line width and the turns of coil influence the efficiency of the induced voltage. Acceleration also play important role because higher acceleration give higher frequency and result in increasing the change of magnetic flux rate in the coil and yield in higher output voltage according to Faraday's Law. The mechanical characteristics are being simulated by using engineering software, CoventorWare. The sensitivity of the structure achieved from the simulation is 7.938xlo·6 V/g at 1.5 Tesla

Formulating Specific Water Quality Criteria for Lakes: A Malaysian Perspective

Monitoring water quality of inland water bodies such as lakes, reservoirs and ponds throughout Malaysia is important to ensure that these water bodies can be managed sustainably for their ecosystem functioning and services. Determining the quality of these water bodies for different uses is limited due to the unavailability of specific criteria or standards for such water bodies in the country. The aim of this study is to develop national water quality criteria and guidance values for lakes to enhance the water quality of the water bodies in Malaysia. The work is based on a literature review and a consensus among experts from the various stakeholders’ consultative sessions. The criteria were divided into four specific uses which aim at protecting the health of human and aquatic life. The criteria and standards are targeted for non‐regulatory purposes to promote lake quality monitoring by various stakeholders. More than 20 parameters were identified in the lake criteria to determine the classification. The identification of parameters and limits for the standards, however, was limited by data availability and appropriate understanding of the water body characteristics. The role of the criteria and their limitation was also discussed

Autonomy, workload, work-life balance, and job performance among teachers

The purpose of this research is to examine the relationship between autonomy, workload and work-life balance on job performance among secondary school teachers in Alor Setar, Kedah. A total of 302 teachers are participated in the study. Regression analyses were used to test the hypotheses. Based on the explanatory factor analysis result, the independent variables for autonomy are control over methods, control at work and control over timing, workload and Work Personal Life Enhancement (WPLE) and Work Interference with Personal Life (WIPL) for worklife balance while dependent variables are sportsmanship, task performance, courtesy, altruism and conscientiousness. The results showed that control over methods of autonomy was found to have a positive relationship with task performance, altruism and conscientiousness of job performance. Control at work reportedly has significant relationship with courtesy but negatively with sportsmanship of job performance while control over timing had significant but negative relation with sportsmanship, courtesy and conscientiousness. Moreover, it was found that workload also has a positive relationship with task performance and courtesy. Further, for work-life balance dimension, Work Interference with personal life (WIPL) found out to have significant but negative relationship with sportsmanship of job performance while Work Personal Life Enhancement (WPLE) have significant relationship with three out of five job performance dimension which is courtesy, altruism and conscientiousness. Limitations of the study, suggestions for future research, theoretical and practical implication were also highlighte