Judul: Design and fabrication of one-dimensional photonic crystal as real time optical sensor for sugar solution concentration detection:
Abstrak: This study is developed from the results of theoretical study of onedimensional photonic crystals with two defects that have unique characteristics in response of Photonic Band Pass (PPB) on the frequency interval of Photonic Band Gap (PBG). This study focused on prototyping photonic crystal sensor based on refractive index changes in a second defect that serves as a receptor in which to respond transmitansi value changes, so that could be used as a single-frequency index sensing. The reference wavelength that used in this study is 525 nm. This research was conducted with some of the following stages: theoretical model of observation through implementation and simulation, fabrication of photonic crystal, characterization, sensing test, assembly and instrumentation devices, and device performance measurement. Fabrication process of a prototype of this system by means of electron beam evaporation equipment in a sample chamber at pressure of 10-3 Pa with BK-7 glass substrate at temperature 573 K. Each of the photonic cells is composed of a high index layer of OS-5 with refractive index of n  2.10 , and an equal optical thickness low index layer of MgF2 with n 1.38. In the first defect cell, the high index layer has twice the thickness of the other layers with the low index layer left unchanged, while in the second defect cell separated by 6 unit cells, the first layer is void to be filled with the sample solution.
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Judul: Sistem Instrumentasi Berbasis Kristal Fotonik Satu Dimensi untuk Pengukuran Parameter Gas NO2 pada Indeks Standar Pencemar Udara
Abstrak: The objective of this research was to build an integrated instrumentation based on one dimensional photonic crystal for NO2 gas measurement. The phenomenon of photonic pass band has been used as an optical detection for liquid concentration measurement. Photonic crystal, light emitting diode, and photodiode were designed to operate in NO2 absorption spectra that are in the range between 500 – 600 nm. The integrated optical instrument consists of three major subsystems i.e. optical sensor based on photonic crystal, signal conditioning, as well as control and data processing. The experimental results showed that the instrument was able to detect and measure the variation of NO2 gas concentration with resolution about 8 bit per μg/m3 equivalent to 14 bit/ppb.
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Judul: Koefisien Kawin-dalam Harimau Sumatera (Panthera tigris sumafme) di Empat Kebun Binatang di Jawa
Abstrak: Harimau Sumatera (Panthera tigris sumatrae) merupakan satwa liar Indonesia spesies Panthera tigris yang masih dapat bertahan hidup, sedangkan dua sub spesies lainnya yang berasal dari Indonesia yaitu Panthera tigris balica (harimau Bali) dm Panthera tigris sondaica (harimau Jawa) telah dinyatakan punah (Santiapillai dan Ramono, 1985). Kepunahan ini disebabkan adanya peningkatan kebutuhan manusia seperti lahan pertanian dan perurnahan sehingga meningkatkan pembukaan hutan dan perburuan liar, ha1 ini menyebabkan semakin terdesaknya kehidupan satwa liar yang menghuni hutan tersebut dan lama kelamaan mengalami kepunahan.
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