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"Penelitian yang dilakukan oleh Wahyu Riyadi, Endang Mardiati dan Heru Winayadi pada tahun 1999 telah menghasilkan apparatus untuk memodelkan aliran air tanah terkekang. Apparatus ini berada pada tahap pengembangan dimana masih memerlukan berbagai penyempurnaan dari sisi alatnya maupun protokolnya. Penelitian ini mengusulkan suatu protokol untuk memodelkan aliran air tanah terkekang dan transpor pencemar pada media berpori heterogen dengan menggunakan alat buatan Wahyu Riyadi, Endang Mardiati dan Heru Winayadi. Pemodelan ini meliputi aliran air pada kondisi steady dan transpor pencemar berupa NaCl. Protokol yang diusung haruslah memberi hasil yang akurat dan presisi sehingga dilakukan repetisi percobaan dengan protokol yang sama, yang nantinya akan diamati penyimpangan data antar percobaannya. Hasil dari penelitian ini belum dapat dinyatakan sempurna karena hasil percobaan belum akurat dan presisi. Karena itu diperlukan beberapa penyempurnaan pada alat dan protokol.

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Research conducted by the Wahyu Riyadi, Endang Mardiati and Heru Winayadi in 1999 has produced apparatus for modeling unconfined groundwater flow. This apparatus is at development stage where they still require improvements in the in terms of the instrument and protocols. This research proposes a protocol for modeling unconfined groundwater flow and transport of contaminants in the heterogeneous porous media. This includes modeling of water flow in steady state and pollutant transport in the form of NaCl. Protocols carried must generate accurate and precise result, so experiment repetitions were done with the same protocol, and the deviations of data between experiments will be observed. The results of this research has not been stated as perfect because the result of the experiment is not yet accurate and precise. Therefore some improvements on the equipments and protocols are needed."

"One of the fisheries management model for the open seas is a population diffusion model , where fish are free to move . This model could be developed from population growth and harvesting models...."

"This paper is the result of the rain attenuation research, especially the results of ARIMA modeling of tropical rain attenuation in thr design of 28 GHZ millimeter wave communication system. Data acquasition is done on the link distance of 56.4 meters on Electrical campus ITS Surabaya. Data acquisition was recorded using the device every 1 second. The data obtained are processed using an ARIMA (p,d,q) model. The process aims to obtain a time series model. Validation process in done by comparing the ARIMA model result with measurements and attenuation model of ITU - R P.838-3. From 6 events that obtained in February 2009 concluded that all events can be approached by ARIMA (0,1,1) model. ARIMA (0,1,1) model can be used to generate rain attenuation data."