Judul: Notifikasi Antrian Pesanan Di Rumah Makan Self Service Menggunakan Frekuensi Radio Dengan Model Komunikasi Point-To-Point.
Abstrak: Cara pemesanan makanan di sebagian rumah makan di Indonesia masih kurang efektif dan efisien karena pembeli harus menunggu pesanannya selesai dalam keadaan berdiri. Oleh sebab itu, suatu alat untuk memberikan notifikasi pesanan makanan yang murah dan sederhana dibuat agar pembeli dapat menunggu pesanannya dengan nyaman. Penelitian ini bertujuan untuk membuat alat yang dapat memberikan notifikasi menggunakan frekuensi radio dengan modulasi digital amplitude shift keying (ASK). Penelitian ini menghasilkan alat notifikasi pesanan makanan yang terdiri atas 4 pasang perangkat yaitu 4 transmitter untuk di kasir dan 4 receiver untuk pembeli. Alat telah berfungsi berfungsi dengan baik, namun masih ada sedikit kekurangan. Receiver dapat menerima sinyal dengan memberikan tanda berupa nyala LED dan buzzer yang berbunyi. Bel notifikasi dengan antena sepanjang 17 cm dan frekuensi 433 MHz dapat menempuh jarak 120 m pada luar ruangan dan 40 m sampai 50 m di dalam ruangan. Pembuatan 4 pasang transmitter dan receiver memerlukan biaya sebesar Rp400.000,00.
Keyword: frekuensi, transmitter, receiver, ASK, modulasi

Judul: Sistem Notifikasi Pemesanan Makanan Berbasis Mikrokontroler Dengan Radio Frequency
Abstrak: Food ordering system in Indonesia is still inefficient because there is no tool that can reduce the notification queue and replace the function of servars. This study aims to develop a cheap and simple notification system for food ordering based on microcontroller with radio frequency. The system consists of 2 main devices: a transmitter for the seller and a receiver for the customer. These devices are connected to each other by a radio signal with a frequency of 433 MHz using Amplitude Shift Keying (ASK) modulation. It is found that this device can make the queuing system becomes more efficient by giving notification in the form of LED light and buzzer sound. The maximum distance between the transmitter and receiver is 70-80 m.
Keyword: Bogor Agricultural University (IPB), transmitter, receiver, radio frequency, microcontroller, amplitude shift keying

Judul: Waxes, policosanols and aldehydes in sugarcane (Saccharum officinarum L.) and okinawan brown sugar (kokuto)
Abstrak: Waxes, long chain alcohols and aldehydes were found in several variants of sugarcane (Saccharum officinarum L.) and Kokuto, a non-centrifuged Okinawan cane brown sugar. Long chain alcohols, policosanols, have been reported to have beneficial effect to human health. The composition of wax in sugarcane was analyzed using HPLC with an evaporative light scattering detector. Sugarcane wax composed of 55–60% aldehydes, sterol esters and wax esters, 32–40% alcohols, and small amounts of triacylglycerols, acids and sterols. Extraction of policosanols performed effectively with hexane and methanol (20:1 v/v), while that of long chain aldehydes was with chloroform and methanol (2:1 v/v). Their composition was determined using GC with a flame ionization detector, whereas their compounds were identified using GC-MS. Sugarcane rinds contained up to 500 mg policosanols and 600 mg aldehydes per 100 g sample of Ni 22 cultivar. The content of policosanol and long chain aldehyde in Kokuto was influenced by its production systems. Compositional analysis of the end product confirmed the presence of policosanols and aldehydes up to 85 mg and 8 mg respectively per 100 g sample of Kokuto A, a product of brown sugar manufacture with open pan heating system. Octacosanol and octacosanal were found to be the major wax components in both sugarcane and Kokuto samples. This study revealed significant difference in content and composition of waxes, policosanols and long chain aldehydes between sugarcane parts, cultivars and harvesting times; also between Kokuto types and production methods.
Keyword: