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"Sulitnya mengandalkan penggunaan air permukaan dikarenakan permasalahan distribusi dan ketersediaanya menyebabkan orang-orang mulai menggunakan sumber air bersih lainnya untuk di konsumsi dan memenuhi aktifitasnya, yaitu air tanah. Untuk menghindari munculnya permasalahan akibat daya konsumsi yang yang berlebihan, maka dibuatkan sebuah program simulator GWFM 2012 oleh Departemen teknik sipil Universitas Indonesia untuk memprediksi dampak pengambilan air tanah tersebut. Namun pada skripsi ini penulis mencoba mengembangkan simulator sejenis dengan menggunakan metode numerik Runge Kutta orde dua, orde tiga dan orde empat untuk mengkaji efisiensi penggunaannya dari segi akurasi, ketelitian dan waktu proses hingga tinggi head sudah tidak berubah lagi terhadap waktu (konvergen).

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Difficulties on relying onto surface water utilization are caused by the limitation issues of surface water availability and distribution, in which eventually leads to the tendency of people on exploiting groundwater as their domestic water source. In order to predict further implications regarding the massive exploitation of groundwater, GWFM 2012 simulator program was developed by the Civil Engineering Department, Faculty of Engineering University of Indonesia. In this undergraduate thesis, author tried to develop similar program by using 2nd, 3rd dan 4th Order of Runge Kutta Numeric Methods so that utilization efficiency in terms of accuracy, precision and running time to reach convergent state can be analyzed thoroughly."

"Column of circular cross setion is favourable to most people for its cool looking and may create image of important place. In addition, the spirally stirrupts and the evently distributed longitudinal reinforcement, embedded in such a column, are amongst favourable characteristic demanded by structural enginneers since those increase ductility as well as strength in all direction. Determining distances of the reinforcement to neutral axis as well as the centre of gravity of concrete in compression are amongst problems found in desinging a circular cross section column. Whitney and Whitney-Hognestad formula as quoted by Wang and Salmon (1979) resolve the problems by converting the circular cross section into squared cross section and by arranging the position of reinforcement.This research studied the effectiveness of the simplified formula proposed by Priyosulistyo (2007) on various material qualities and amount of reinforcement. The reselts of the study are presented graphically in the form of interaction diagrams and are compared to the diagram of exact solution, the Whitney and the Whitney-Hognestad solutions. On the same diagramthe stright lines, established from simplified design formula (Priyosulistyo, 2007) connecting to the point of maximum axial load at zero moment to balance point as well as connecting point of maximum flexural moment at zero axial load to balance point, are developed.This research showed that Whitney formula is conservative at compression control region, but excessively over estimate at about balance and tension control regions, although the application is limited to low ratio of steel to concrete cross sections (less than 1%) and become excessively overestimate along with the increase of the steel to concrete ratio, therefore, one should carefully consider the range of the applicability. The simplified formula as proposed by Priyisulistyo (2007) herein is consistant and reliable enough in any region (compression, balance snd tension regions), although the results tends to be conservative. Since columns of building, in accordance with SNI-03-2487-2002 code, should be designed stronger than that the beams connecting to them the conservative performance resulting from the simplified formula is still acceptable."

"Skripsi ini membahas tentang analisa perhitungan Track Acces Charge (TAC) pada perkeretaapian Indonesia atas penggunaan infrastruktur kereta api. Pendekatan yang digunakan menggunakan metode Marginal Cost Plus Markup (MC+). Metodologi yang digunakan pada penelitian ini adalah dengan melakukan benchmarking terhadap komponen-komponen penyusun TAC di berbagai negara Eropa. Penelitian ini akan menghasilkan sebuah simulasi untuk menentukan besaran TAC berbasis Infrastructure Maintenance and Operations (IMO) yang bisa digunakan untuk memperkirakan besaran TAC yang seharusnya dibayarkan oleh Operator serta dukungan dan komitmen dari Pemerintah terkait subsidi yang diberikan untuk perkembangan transportasi kereta api di Indonesia.

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This final report discuss about analysis of Track Access Charge (TAC) calculation on Indonesian railways for the use of railway infrastructure. The approach used in this study is Marginal Cost Plus Markup (MC+). The methodology of this study is benchmarking the components that compose TAC in Europe countries. The research done for this thesis will generate a simulation to design the TAC that is Infrastructure Maintenance and Operation (IMO) based which can be used to determine the amount of TAC that should be paid by the Operator. The simulation can also be used to determine the goverment’s support and commitment as subsidy on railway development in Indonesia."

"Kebutuhan moda transportasi umum kereta api di Indonesia mengalami kemunduran. Salah satu penyebab kemunduran adalah kualitas dari moda transportasi tersebut. Penelitian ini dilakukan untuk memberi solusi untuk sebuah penyelesaian masalah dari salah satu faktor penyebab kemunduran kualitas dari kereta api tersebut. Dalam penelitian ini dilakukan analisa komponen-komponen dari TAC (Track Access Charge) dan kemudian dilakukan benchmarking kepada negara-negara Eropa yang telah menggunakan sistem TAC tersebut. Perhitungan dilakukan berdasarkan hasil analisa benchmarking. Hasil perhitungan menunjukan bahwa besaran TAC (track Access Charge) lebih besar dibandingkan besaran IMO (Infrastructure Maintenance and Operation). Walaupun demikian, pemerintah masih bisa menurunkan besaran TAC dengan memberikan subsidi kepada operator kereta api.

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The needs of public transportation mode of railways in Indonesia suffered a setback. One of the causes of the decline is the qualities of the transportation. This research was conducted to provide a solution for solving the problems of one of the factors causing the decline of the quality of the railway. In this research, researcher conducted analysis of the components of the TAC (Track Access Charge) and then carried out benchmarking to the European countries which have been using the TAC system. The calculation is done based on the results of the benchmarking analysis. The results show that value of TAC is bigger than the value of IMO (Infrastructure Maintenance and Operation). However, Government could still decrease the value of TAC by giving subsidies to train operator."

"Sebuah perusahaan (PT.X) memiliki rencana jangka panjang untuk mengoptimalkan beberapa aset lahan dan bangunannya saat ini yang berada di kota-kota besar dengan tujuan asset lahan dan bangunan yang ada saat ini dapat menghasilkan sumber pendapatan bagi perusahaan.Optimalisasi difokuskan terhadap beberapa aset yang berlokasi di DKI Jakarta. Rencana yang akan dilakukan adalah dengan mengoptimalisasi aset lahan dan bangunan yang dimiliki dengan orientasi optimalisasi di bidang properti komersial seperti optimalisasi bangunan menjadi hotel, kantor sewa, dan ritel sewa. Namun pemilihan jenis alternatif optimalisasi tersebut ditentukan berdasarkan beberapa kriteria antara lain : 1. Aspek legalitas, 2. Aspek Teknis, 3. Aspek Lingkungan, 4. Aspek Bangunan/Tapak, 5. Aspek Pasar, 6. Aspek Keuangan sehingga dibutuhkan suatuan alias pemilihan terhadap optimalisasi yang sesuai dengan lokasi asset lahan dan bangunan. Metode Analytic Hierarchy Process (AHP) merupakan metode yang digunakan untuk pemilihan jenis optimalisasi aset berdasarkan aspek-aspek yang mempengaruhi optimalisasi suatu aset lahan dan bangunan.

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A company (PT.X) has a long term plan to optimize some of the land and buildings assets currently located in major cities with the goal of land and building assets that exist today can generate a source of revenue for the company. Optimization is focused on several assets located in Jakarta. The planning is to optimize land and building assets that owned with optimizing orientation in the field of commercial property such as the optimization of the building into a hotel, rental office, and rental retail spaces.

However, the choice of optimization alternatives is determined based on several criteria, such:

1.Legality Aspect,

2. Technical Aspect,

3. Environmental Aspect,

4. Aspect of Building / Site,

5. Aspect of Market,

6. Financial Aspect, that required an analysis of the selection optimization according to the location of the land and building assets.

Analytic Hierarchy Process (AHP) is a method that used for selecting the type of asset optimization based on the aspects that influence the optimization of a land and building assets."

"Sermo Reservoir has been useful for irrigation and power plant. Despite its good reservoir management the reservoir spills millions of cubic meter of water yearly. On the other hand, there is a need for domestic water for surrounding area that can not be met. It indicates that the reservoir capacity needs increasing. The combined spillway (Free flow spillway and siphon) has been studied where higher capacity of water storage may be attained without increasing the dam crest. This is conducted by increasing the crest of the open type spillway (for examole ogee) to a certain height and at the same time adding the capacity of the open type spillway with spion. At certain height above the open spillway crest, the siphon is priming to add the discharge out from the spillway and hence required height of flood water above the open spillway is reduced. Such method that is increasing spillway weir crest may be applied for Sermo Dam.The paper studie a typical reservoir called Waduk Sermo that is located in Kulon Progo, Special province of Jogjakarta, where the data is available for simulation. During three years of record, Sermo resevoir spills quite a lot of water which otherwise was very useful for the domestic water. With the increasing need for clean water, it is essential to study the real availability of water in the reservoir. Such spill would have been minimized when the dam was equipped with siphon spillway. Mathematical modeling of water balance in the reservoir during the three years of record was carried out. The out flow includes water for irrigation, electricity power and domestic purpose (drinking water). The domestic water discharge is varied in order to obtain optimal capacity for water withdrawal. The effect of higher spillway crest on the capacity of the reservoir to supply domestic water is simulated for comparison.The study shows that Sermo reservoir is capable of serving approximately 1501/s of domestic water with time of service is 92%. This is the same as if no water is available for approximately one month per year. An additional dam crest of 1 m high produces a capacity of approximately 2251/s at the same risk as before. There is approximately an additional 2 million m3 of water available for domestic water yearly. It is concluded that such reservoir might have been more optimal when the crest was 1 m higher."