Development of an FPGA-based gate signal generator for a multilevel inverter

The application of Field Programmable Gate Array (FPGA) in the development of power electronics circuits control scheme has drawn much attention lately due to its shorter design cycle, lower cost and higher density. This paper presents an FPGA-based gate signal generator for a multilevel inverter employing an online optimal PWM switching strategy to control its output voltage. FPGA is chosen for the hardware implementation of the switching strategy mainly due to its high computation speed that can ensure the accuracy of the instants that gating signals are generated. The gate signal generator has been realized by an FPGA (FLEXlOKZO) from Altera. The design and development of the FPGA based gate signal generator is described in detail. Results from the timing simulation using MAX+PLUSII software are given and verified by the results obtained from the FLEXlOK2O output

Phase-Fitted and Amplification-Fitted Higher Order Two-Derivative Runge-Kutta Method for the Numerical Solution of Orbital and Related Periodical IVPs

A phase-fitted and amplification-fitted two-derivative Runge-Kutta (PFAFTDRK) method of high algebraic order for the numerical solution of first-order Initial Value Problems (IVPs) which possesses oscillatory solutions is derived. We present a sixth-order four-stage two-derivative Runge-Kutta (TDRK) method designed using the phase-fitted and amplification-fitted property. The stability of the new method is analyzed. The numerical experiments are carried out to show the efficiency of the derived methods in comparison with other existing Runge-Kutta (RK) methods

Peningkatan Hasil Belajar IPA dengan Index Card Match Materi Sifat Bahan dan Kegunaan Benda

Intention of this research is to know do applying of model study of Index of Card Match can improve motivation learn and student creativity at study of Natural Sciences in SDN 13 SP3 Trans Nobal. This Research is research of class action (Classroom Action Research) including planning, execution, and observation of refleksi. This research take place during 2 cycle. Technique intake of data pass/through observation sheet and student creativity, tes result of learning and documentation. Applying of Index method of Card Match started by preparing RPP, preparing card, picture media, student observation sheet and tes. Applying of Index method of Card Match can improve result learn student[at Natural Sciences items subject ofis Nature of Materials and Usefulness of Object in class of IV SDN 13 SP3 Trans Nobal District of Belimbing, this matter can be seen from complete learn at cycle pre there is 7 student or 35% with class average value 57, cycle of I there is 14 student or 70% with class average value 72 and cycle of II there is 20 student or 100% with class average value 83

Technical and vocational education students’ perception of using learning videos during Covid-19 pandemic period

The closure of Higher Education Institutions and Schools due to COVID-19 pandemic has affected the structure of Learning and Teaching (T&L) from direct method at institutions to Open and Distance Education (ODE) completely. All face-to-face T&L activities are not allowed except for certain categories of students who need to return to campus in stages to participante in T&L activities in full compliance of the Standard Operating Procedures (SOP) set by prioritizing safety measures and social distancing. This study used a quantitative approach by using online questionnaire as instrument (google form). A total of 73 Technical and Vocational Education (TVE) students from various backgrounds of respondents participated in the study. The findings of the study showed that there was a strong correlation between the aspects of interest and gender of TVE students in using learning videos during the COVID-19 pandemic period (r = .701). Therefore, all parties must prepare to face the new norm, namely the ODL method as a whole during the COVID-19 pandemic period to continue the T&L process for students

The Predictors of Habitual Behavior in Using Mobile Phone among University Students

The use of technology in academic activities, particularly in higher education institutions is one thing in common and undeniable. Entering the era of information technology without borders, the use of technology such as computers, laptops, tablets, mobile phones and so on are seen as essential roles to assist educational activities. Therefore, the utilization has become the norm among instructors and students in higher education institutions. Through previous studies, the terms of norms often referred to habitual behavior or automatically behavior. This study focused on three of independent variables from UTAUTrsquos model (performance expectancy, effort expectancy and social influences) to predict studentsrsquo habitual behavior in higher education in the use of mobile phone. This study involved 393 of undergraduatesrsquo student and was conducted entirely in Universiti Putra Malaysia (UPM), Serdang.nbsp The results of data analysis revealed all the independent variables have significant effect on habitual behavior.nbs

Antioxidant and antityrosinase activities of piper maingayi HK. Essential oils

The study was aimed to investigate the chemical components of stem and fruit volatile oils of Piper. maingayi Hk. with their antioxidant and antityrosinase activities. GC and GC-MS analysis of the essential oils obtained from the fresh stem and fruit of P. maingayi Hk. resulted in the identification of 34 and 18 components accounting for 83.6% and 78.7% of the total amount, respectively. Sesquiterpene hydrocarbons and oxygenated sesquiterpenes were the most highly represented classes as the former ranging from 64.7% to 70.7%, and the latter varying from 7.4% to 8.6%. The main constituents of the stem oil were: α-caryophyllene (26.2%), α-cedrene (8.4%), caryophyllene oxide (6.7%) and cis-calamenene (6.2%), while the fruit oil was dominated by δ-cadinene (22.6%), β-caryophyllene (18.8%), α-copaene (11.2%) and α-cadinol (7.1%). The stem and fruit of P. maingayi oils showed significant value for antioxidant and antityrosinase activities

Sistem Informasi Penjualan Sandal Berbasis Web

Toko Cucko Bandung adalah sebuah USAha yang bergerak dalam bidang penjualan sandal cucko yang beralamat di jalan leuwi Anyar VI , Kota Bandung – Jawa Barat. Toko Cucko ini menyediakan berupa penjualan sandal dan dapat menerima pemesanan sandal sesuai keinginan konsumen, dari model sandal ,warna sandal dan ukuran. Permasalahan saat ini pada Toko Cucko Bandung adalah dalam penjualan, mempromosikan dan pemesanan masih dengan manual ,hal ini kurang efektif karena tidak ada informasi yang detail mengenai sandal pada toko cucko untuk komsumen. Proses pemesanan yang sedang berjalan pada toko cucko bandung masih menggunakan via bbm, whatshap atau datang lansung ke tempat, hat tersebut masih kurang efesien. Pencatatan dan pengecekan data – data transaksi, data pelanggan, data barang ,masih dilakukan dengan manual dalam arsip dokumen tertulis, kehilangan data masih besar kemungkinan akan rentan terjadi.Metode penelitian yang digunakan adalah dengan wawancara, dokumentasi dan observasi. Adapun metode pendekatan sistem yang digunakan adalah Struktur dengan menggunakan Flowmap sebagai alat bantu untuk merancang sistem yang akan dibuat dengan metode pengembangan sistem ini adalah prototype. Pembangunan Sistem Informasi Penjualan sandal ini menggunakan PHP sebagai Bahasa pemrograman dan XAMPP sebagai database. Dengan adanya Sistem Informasi berbasis Website diharapkan dapat mempermudah proses pelayanan penjulan, pemensanan dan pengolahan data pada Perusahaan ini

A whole-health-economy approach to antimicrobial stewardship: Analysis of current models and future direction.

Antimicrobial stewardship (AMS) strategies are widely implemented in single healthcare sectors and organisations; however, the extent and impact of integrated AMS initiatives across the whole health economy are unknown. Assessing degree of integration of AMS across the whole health economy and its impact is essential if we are to achieve a ‘One Health’ approach to addressing antimicrobial resistance (AMR), and therefore we searched systematically for and analysed published examples of integrated AMS initiatives to address this gap. Application of a system-level framework to analyse integration of AMS initiatives across and within healthcare sectors shows that integration is emerging but needs strengthening. Findings from a small number of evaluations in high-income countries suggest that antimicrobial prescribing and healthcare-associated infections can be reduced using a multisectoral integrated AMS approach. More robust research designs to evaluate and understand the impact of multisectoral integrated AMS are needed, particularly with respect to differing health systems in different countries and local organisational contexts. Our analysis highlights a number of challenges and ways forward for enhancing the delivery of AMS through an integrated approach

Generation of Q-switched thulium-doped fiber laser (TDFL) using differentsaturable absorbers

A Q-switched Thulium-doped Fiber Laser (TDFL) operating at approximately 2 µm wavelength is successfully generated by using four different saturable absorbers (SAs) which are nitrogen-doped graphene in PVA (NG:PVA), nitrogen-doped graphene in PEO (NG:PEO), single-walled carbon nanotube in PVA (SWCNT:PVA), and high pressure carbon monoxide carbon nanotube in PVA (CNTHiPCO:PVA). The SAs integrated in the cavity were able to provide the real saturable absorption in modulating the intra-cavity losses. SWCNT gives the best results with the highest repetition rate and lowest pulse width of 57.45 kHz and 1.958 nJ correspondingly as compared to the other three SAs

Struktur Komunitas Biologi di Danau Pondok Lapan, Kabupaten Langkat Provinsi Sumatera Utara

Danau Pondok Lapan (DPL) adalah sebuah danau buatan yang terdapat di Kabupaten Langkat. Danau ini berfungsi sebagai sumber air, irigasi, resapan air tanah bagi masyarakat sekitar, pengendali banjir, dan kegiatan pemancingan ikan. Sampai saat ini data-data tentang danau tersebut sangatlah terbatas. Data-data terkait sumberdaya yang terdapat di danau sangat diperlukan untuk pengelolaan yang lebih tepat. Diantara beberapa data yang dimaksud adalah organisme penyusun danau. Penelitian ini bertujuan untuk mempelajari kondisi biologis DPL dengan melihat keragaman jenis dan struktur komunitas nekton, benthos dan plankton di perairan. Pengambilan sampel dilakukan pada bulan Februari - April 2015. Hasil pencacahan plankton di DPL ditemukan 52 jenis dari 10 kelas. Ada 6 kelas dari kelompok pitoplankton dan 4 kelas dari kelompok zooplankton. Jumlah genus paling banyak ditemukan jenis fitoplankton dan zooplankton masing-masing dari kelas Chlorophyceae berjumlah 18 genus dan dari kelas Cladocera sebesar 5 genus. Nekton yang ditemukan terdapat 2 kelas yaitu Actinopterygii dan Malacostrata.Terdapat 5 Ordo nekton yang ditemukan, yaitu 4 ordo dari jenis ikan dan 1 ordo dari jenis udang. Benthos yang ditemukan hanya 3 jenis dari kelas gastropoda, yaitu Bithynia tentaculata, Pomacea canaliculata dan Campeloma decisum. Struktur komunitas plankton, nekton dan benthos relatif tidak stabil serta ada kecenderungan didominansi oleh jenis tertentu.Pondok Lapan Lake (PLL) is an artificial lake located in Langkat regency. The lake its function as source of water, irrigation, catchment area, flood control, and fishing activities. Until recently data about this lake, are limited. The data related to the resource contained in the lake is very necessary for a more appropriate management. Among some of these data are organisms that inhabit the lake. This research aims to study the biological conditions of PLL to see the diversity and community structure of nekton, benthos and plankton. Sampling was conducted in February - April 2015. PLL enumeration results in the plankton found 52 species of 10 classes. There are 6 classes of groups pitoplankton and 4 classes of zooplankton groups. Nekton found there are 7 types of two classes, namely Actinopterygii and Malacostrata. Benthos found only 3 species of gastropod class, namely Bithynia tentaculata, Pomacea canaliculata and Campeloma decisum. Community structure benthos, nekton and plankton are relatively unstable and there is a trend happening dominance by a particular typ