Development of an Obstacle Avoiding Robot

Development of an obstacle avoiding robot model is required as a fundamental step towards a bigger goal, for example development of an autonomous vehicle. An obstacle avoiding robot uses a proximity sensor module, besides other parts. In this case, this robot uses a proximity sensor developed by ourselves. The robot is controlled by a program that is embedded into a microcontroller. The logics produced by the microcontroller are further processed by an interface module, in this case, also developed by ourselves. The interface module translates microcontroller’s logics into voltage and current that can practically drive the two motors. This article provides a report on the project activity, consisting of summary of the design, summary of the development process and report on the running test of the robot. Following the test and program fine-tuning, it has been proven that the robot model operated well just as programmed

Computation and Experiment on Linearly and Circularly Polarized Electromagnetic Wave Backscattering by Corner Reflectors in an Anechoic Chamber

Electromagnetic wave backscattering by corner reflectors in an anechoic chamber is studied using our developed computational tool. The tool applies the Finite-Difference Time-Domain (FDTD) method to simulate the propagation of the wave’s electric and magnetic fields. Experimental measurement in an anechoic chamber is also carried out as a comparison. The two results show agreement, including the finding that the backscatter intensity variation amongst the four circularly polarized modes is significantly smaller than the variation amongst the four linearly polarization modes

توكيل ولي النكاح عند عقد النكاح (دراسة حالة: فهم الولي بقرية جنطيني لارن لامونجان في أركان النكاح) إعداد: محمد نصوحا،المشرف الأول: عيسى أنصاري الماجستر، المشرف الثاني:عبد الباسط الماجستر.

Abstract :Guardian is one of the pillars in a marriage, because the position of the guardian is a legal and whether a marriage determinant. However, some trustees understand that the position of guardians is only used as a formality. So that many trustees are still found to represent their guardianship rights to the Penghulu. This is the case, in Centini Village, Laren Subdistrict, Lamongan Regency, many marriage guardians choose someone else to be their guardian on the marriage covenant, although there is no obstacle for the representatives to marry off their daughter on the marriage covenant.From this background, the writer formulates the problem into 2, namely 1) How is the understanding of guardians in Centini Village, Laren Subdistrict, Lamongan Regency, regarding Tauki>l Waly nikah in a marriage covenant? 2) What are the reasons for the marriage guardian in doing Tauki>l Waly ?. This type of research is field research because researchers observe directly what is happening in the community. This research uses descriptive qualitative normative analysis method in presenting the results of research using words based on data obtained. The data collection method is obtained through observation, interviews and documentation.Centini Laren Subdistrict Lamongan Regency has an understanding that Tauki>l Waly nikah is allowed. Their understanding is only based on the many practices of Tauki>l Waly in Centini Village which are carried out by the marriage guardian in each marriage procession. Nevertheless, they agreed that the guardian was a harmonious marriage covenant and was a virtue for the guardian if he allowed his own child getting married. The factors that became the reason for the marriage guardian in doing Tauki>l Waly were 1) The assumption of the trustees that marriage is the duty of the Office of Religious Affairs officers, while the guardian is only looking for a partner for his child. 2) Fear that mistakes occur when Ijab in a marriage covenant. 3) Tauki>l Waly becomes a custom for marriage guardians. Keywords: Guardians’ Understanding, Tauki>l Waly, Marriage Covena

Pengembangan Sistem Kendali Alat Elektronika Menggunakan Mikrokontroler Arduino Uno R3 dan Ethernet Shield dengan Antarmuka Berbasis Android

Sistem kendali perangkat elektronika merupakan sebuah sistem sederhana yang dibangun untuk dapat mematikan dan menghidupkan perangkat elektronika, khususnya  perangkat elektronika yang terdapat di sekitar rumah dengan memanfaatkan perkembangan teknologi informasi saat ini. Penelitian yang dilakukan bertujuan untuk mengembangkan sebuah sistem yang dapat membantu masyarakat perkotaan dalam melakukan pengendalian terhadap alat elektronika yang digunakan sehari-hari di tempat tinggal yang mencakup software dan hardware dengan perangkat mobile sebagai kendalinya. Penelitian mengadopsi tahapan-tahapan metode pengembangan prototype dan sistem yang akan dikembangkan nantinya menggunakan perangkat keras mikrokontroler Arduino UNO R3 sebagai pusat kendali utama sistem yang terhubung dengan jaringan lokal dengan akses nirkabel pada jaringan lokal menggunakan wireless router dan ethernet shield, dan sebagai antarmuka kendali terhadap sistem digunakan aplikasi berbasis Android menggunakan aplikasi open source MIT Application Inventor. Setelah beberapa kali percobaan dilakukan, dapat disimpulkan bahwa sistem ini memungkinkan pengguna untuk mematikan dan menghidupkan alat lektronika melalui perangkat mobile, seperti lampu, kipas angin dan lainnya tanpa harus dengan berjalan menuju lokasi saklar yang ditempatkan menyebar di dalam tempat tinggal sehingga dapat menghemat waktu dan tenaga

Axial Ratio and Gain Enhancement of a Circular-Ring Slot Antenna Using a Pair of Asymmetrical Rectangular Slots and a Parasitic Patch for a Radio Beacon on a Nanosatellite

Radio beacons enable measurements of ionospheric radio scintillations and total electron content (TEC). These beacons transmit unmodulated, phase-coherent waves in S-band frequencies. Many satellite applications require circularly polarized (CP) wideband antennas. Their compact size, lightweight, and simple fabrication method make CP antennas suitable for small satellite systems. The slot antenna has wideband impedance, but the 3 dB axial ratio bandwidth (ARBW) is narrower compared to the impedance bandwidth (IBW). In this paper, a circularly polarized circular-slotted antenna (CSA) is proposed to enhance the ARBW and the antenna gain. A pair of asymmetrical rectangular slots, a simple 50 Ω feedline and a parasitic patch were introduced to a CSA to enhance the 3 dB ARBW and the antenna gain. Rectangular slots were inserted on the diagonal axis of the CSA, the feedline was shifted to the left side of the x-axis, and a parasitic patch was attached to the circular slot. The lengths of the rectangular slots correspond to the resonant frequency, and the parasitic patch width corresponds to the higher frequency of the 3 dB ARBW. The asymmetrical rectangular slots, the shifted feedline, and the parasitic patch successfully improved the measured 3 dB ARBW of the antenna by 787.5 MHz or 35.79%. The measured gain of a CSA with left-hand circular polarization (LHCP) was also improved by shifting the feedline and the rectangular slot, achieving a peak gain of 5 dBic

The maiden flight of Hinotori-C: The first C band full polarimetric circularly polarized synthetic aperture radar in the world

Synthetic Aperture Radar (SAR) is a very powerful tool in microwave remote sensing due to its capability of all-weather and day-to-night time operation [1]. Carl Wiley invented SAR in 1951 to overcome the poor azimuth resolution in conventional Side-Looking Airborne Radar (SLAR), followed by a patent filed in 1954 [2]. Unlike SLAR, using the forward motion of the platform and the principle of Doppler beam sharpening, the azimuth resolution of a SAR is equal to half the antenna length and is independent of the range distance [3]. Since the invention of SAR, steered by the breakthrough in science and technology, many advanced SAR techniques have been proposed and realized. These techniques include, but are not limited to, spotlight SAR for a finer image resolution [4], scan SAR for a wider swath coverage [5], and the remarkable polarimetric [6] and interferometric [7] SAR techniques using multichannel SAR system [8], [9], [10] for advanced remote sensing applications. Over the years, SAR has been widely used in different types of application, particularly in Earth observation such as disaster damage assessment [11], land deformation observation [12], oceanography [13], terrain classification [14], target detection [15], and so on. The diversified applications of SAR have encouraged the rapid development of airborne and spaceborne SAR sensors