Miniaturized Concentric Hexagonal Fractal Rings Based Monopole Antenna for WLAN/WiMAX Application

In this paper a new antenna design technique is introduced in order to achieve tri-band operation as well as antenna miniaturization. The technique consists of using two concentric first-iterative hexagonal rings connected to each other as a radiating patch fed with a Y-shaped microstrip line. The proposed antenna operates at three frequency bands to cover 2.4/5.8 GHz WLAN and 3.5GHz WiMAX bands. The numerical analysis and simulation are carried out with CST MWS. The measured return losses of the proposed antenna show good performance and good agreement with the simulated results. Consequently the proposed antenna with compact size of 9.77 mm x 17 mm x 1.63 mm is well suited for wireless applications

Design and Fabrication of a Novel Quadruple-Band Monopole Antenna Using a U-DGS and Open-Loop-Ring Resonators

In this Article, a novel quadruple-band microstrip patch antenna is proposed for the systems operating at quad-band applications. The antenna structure is composed of modified rectangular patch antenna with a U-shaped defected ground structure (DGS) unit and two parasitic elements (open-loop-ring resonators) to serve as a coupling-bridge. The proposed antenna with a total size of 31×33 mm2 is fabricated and tested. The measured result indicates that the designed antenna has impedance bandwidths for 10 dB return loss reach about 180 MHz (4.4–4.58 GHz), 200 MHz (5.4–5.6 GHz), 1100 MHz (7.2–8.3 GHz), and 700 MHz (9.6–10.3 GHz), which meet the requirements of the wireless local area network (WLAN), worldwide interoperability for microwave access (WiMAX), C and X bands applications. Good agreement is obtained between measurement and simulation results

A Compact Multi-Band Monopole Antenna using Metamaterial for WLAN/WiMAX Applications

In this paper, a tri-band printed monopole antenna with electrically coupled metamaterial units is proposed and investigated. The proposed antenna is designed to cover WLAN/WiMAX applications. The antenna consists of a printed strip line and two double metamaterial unit cells of different size placed near the monopole antenna on opposite sides. Each unit cell exhibits a negative permeability over the resonance frequency at 2.5 GHz and 3.62 GHz, which produces magnetic couplings with the monopole antenna. The proposed antenna structure was fabricated and measured. The measured -10 dB bandwidth for the return loss is from 2.47GHz-2.51GHz, 3.59GHz-3.69GHz, and 5.3GHz - 7.2 GHz, which are suitable for (WLAN: 2.4–2.484,  5.15–5.35,  and  5.725–5.85  GHz) and  (WiMAX: 2.5–2.69, 3.4–3.8, and 5.25–5.85 GHz) band Applications. By using the switches across the gap of proposed-MTM unit cell, the effect of this unit deactivated and its resonance frequency will disappear. Hence, the proposed antenna maintains the omnidirectional radiation pattern

EVALUASI PELAKSANAAN PROGRAM GERAKAN LITERASI SEKOLAH DI SEKOLAH DASAR NEGERI

 Abstract: This research aimed to determine: (1) the context of school literacy movement programs implementation, (2) the input of school literacy movement programs implementation,  (3) the process of school literacy movement programs implementation,  and (4) the product obtained from school literacy movement programs implementation in all of public elementary schools in subdistrict of Paguat. The design of this study was an evaluation study using evaluation model of Process and Product Input Context. (PPIC). The technique of data collection used  questionnaire and interview. The research results showed that: (1) the context of school literacy movement programs implementation was in good category, (2) the input of school literacy movement programs implementation was in good category, (3) the process of school literacy movement programs implementation was in good category, and (4) the product obtained from school literacy movement programs implementation was in good category. It can be concluded that the evaluation of the school literacy movement programs implementation in all of public elementary schools in subdistrict of Paguat have been carried out properly in terms of the implementation of the activities from the habit stage to the learning stages that have been carried out in accordance with the guidelines of school literacy movement implementation. Abstrak: Penelitian ini bertujuan untuk mengetahui: (1) konteks pelaksanaan program gerakan literasi sekolah, (2) input pelaksanaan program gerakan literasi sekolah,  (3) proses pelaksanaan program gerakan literasi sekolah,  dan (4) produk pelaksanaan program gerakan literasi sekolah di SD Negeri se Kecamatan Paguat. Desain penelitian ini bersifat studi evaluasi dengan menggunakan model evaluasi Conteks Input Proses, dan Produk (CIPP). Teknik pengumpulan data yang digunakan  adalah kuesioner, dan wawancara. Hasil penelitian menunjukan bahwa: (1) konteks dalam pelaksanaan program gerakan literasi sekolah berada pada kategori baik, (2) input dalam pelaksanaan program gerakan literasi sekolah berada pada kategori baik, (3) proses dalam pelaksanaan program gerakan literasi sekolah berada pada kategori baik, dan (4) produk dalam pelaksanaan program gerakan literasi sekolah berada pada kategori baik. Kesimpulan dari hasil penelitian bahwa evaluasi pelaksanaan program gerakan literasi sekolah se Kecamatan Paguat sudah dilaksanakan dengan baik, dilihat dari segi pelaksanaan kegiatan dari tahap pembiasaan sampai dengan tahap pembelajaran telah dilakukan sesuai pedoman pelaksanaan gerakan literasi sekolah

Thermomechanical behavior of brake drums under extreme braking conditions

Braking efficiency is characterized by reduced braking time and distance, and therefore passenger safety depends on the design of the braking system. During the braking of a vehicle, the braking system must dissipate the kinetic energy by transforming it into heat energy. A too high temperature can lead to an almost total loss of braking efficiency. An excessive rise in brake temperature can also cause surface cracks extending to the outside edge of the drum friction surface. Heat transfer and temperature gradient, not to forget the vehicle's travel environment (high speed, heavy load, and steeply sloping road conditions), must thus be the essential criteria for any brake system design. The aim of the present investigation is to analyze the thermal behavior of different brake drum designs during the single emergency braking of a heavy-duty vehicle on a steeply sloping road. The calculation of the temperature field is performed in transient mode using a three-dimensional finite element model assuming a constant coefficient of friction. In this study, the influence of geometrical brake drum configurations on the thermal behavior of brake drums with two different materials in grey cast iron FG200 and aluminum alloy 356.0 reinforced with silicon carbide (SiC) particles is analyzed under extreme vehicle braking conditions. The numerical simulation results obtained using FE software ANSYS are qualitatively compared with the results already published in the literature

Spectroscopic (FT-IR,H-1 and C-13 NMR) characterization and density functional theory calculations for (Z)-5-(4-nitrobenzyliden)-3-N(2-ethoxyphenyl)-2-thioxo-thiazolidin-4-one (ARNO)

In this work, the vibrational spectral analysis is carried out by using FTIR spectroscopy in the range 4000 -400 cm(-1) (2)-5-(4-nitrobenzyliden)-3-N(2-ethoxypheny1)-2-thioxo-thiazolidin-4-one (ARNO) molecule. Theoretical calculations were performed by using density functional theory (DFT) method using 6-31G (d, p) and 6-311G (d, p) basis sets. The results of the calculations were applied to simulated spectra of the title compound, which show excellent agreement with observed spectra. The first order hyperpolarizability and related properties (mu and alpha) for ARNO were also calculated. Stability of the molecule has been analyzed by natural bond orbital (NBO) analysis. Mulliken population analysis on atomic charges of the title compound has been carried out by the same method and basis sets. Finally, molecular electrostatic potential (MEP) and HOMO-LUMO energy levels have been evaluated. (C) 2017 Elsevier B.V. All rights reserved

Pelaksanaan Pembelajaran Soft Skill Mahasiswa

Perguruan tinggi memiliki peranan penting dalam menjadikan mahasiswa yang memiliki soft skill, pengembangn soft skill dapat dilakukan dalam berbagai kegiatan baik melalui integrasi ke dalam kurikulum dan kegiatan, kegiatan kemahasiswaan. Penelitian ini bertujuan untuk mengetahui pelaksanaan pembelajaran soft skill mahasiswa di Universitas Muhammadiyah Luwuk, dengan pendekatan penelitian menggunakan kualitatif diskriptif, melalui observasi, wawancara studi dokumentasi, data yang diperoleh disimpulkan. berdasarkan hasil penelitian, menunjukan bahwa pelaksanaan pembelajaran soft skill mahasiswa sudah dilakukan namun masih dalam pelaksanaan pendekatan konfensional atau kesepakatan. Pengembangan soft skill mahasiswa dengan prioritas pengembangan agar mahasiswa mampu beradaptasi dengan lingkungan dilakukan dengan pendekatan model pembelajaran yang dapat mensinergikan antara hard skill dan soft skill

On the influence of the exciton-blocking layer on the organic multilayer cells properties

The performances of organic photovoltaic cells based on the layer couple electron donor/electron acceptor (ED/EA) are significantly improved when an exciton blocking layer (EBL) is inserted between the organic acceptor and the cathode. A new material, the (Z)-5-(4-chlorobenzylidene)-3-(2-ethoxyphenyl)-2-thioxothiazolidin-4-one, that we called (CBBTZ), has been synthesized, characterized and probed as EBL. The energy levels corresponding to the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) of the CBBTZ have been determined from the first oxidation and reduction potential respectively, using cyclic voltametric (CV) measurements. From CV curves, CBBTZ in dichloromethane showed a one electron reversible reduction and oxidation waves. The values of its HOMO and LUMO have been estimated to be 6.42 eV and 3.42 eV respectively. Such values show that CBBTZ could be probed as EBL in organic solar cells based on the ED/EA couple copper phthalocyanine(CuPc)/fullerene (C60). The photovoltaic solar cells have been obtained by sequential deposition under vacuum of the different films. The different thin film thicknesses were measured in situ by a quartz monitor. Multilayer solar cells ITO/Au/CuPc/C60/EBL/Al have been probed, where EBL is the aluminium tris(8-hydroxyquinoline) (Alq3), the CBBTZ, the 2-(4-byphenylyl)-5-(4-tert-buthylphenyl)-1,3,4-oxadiazole (butyl PBD) or the bathocuproine (BCP). The optimum film thickness is 8–9 nm whatever the EBL used. When obtained in the same run, the averaged efficiency of the cells using the CBBTZ is of the same order of magnitude than that obtained with BCP and higher than that achieved with Alq3 or butyl PBD. It is shown by XPS study that some aluminium of the cathode is present in the buffer layer. This aluminium could justify the ability of the electrons to cross the insulating exciton blocking layer thick of 9 nm