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Abstrak :
Pengotoran membran telah menjadi tantangan utama dalam penerapan praktis teknologi membran untuk pengolahan dan pemurnian air limbah. Dalam penelitian ini, membran oksida grafena (GO) terinterkalasi g-C3N4@TiO2-nanowire (GO/CN@TNW) yang dapat didaur ulang berhasil dibuat melalui interaksi elektrostatik dan proses bantuan filtrasi vakum. Membran yang dipreparasi memiliki aktivitas respon cahaya yang lebih tinggi daripada TNW murni, yang disebabkan oleh pengenalan GO dengan penyerapan dan mobilitas pembawa yang tinggi, dan efek sinergis dari TNW dan CN. Selain itu, interaksi penumpukan π - π antara GO dan molekul pencemar organik berkontribusi pada efisiensi adsorpsi yang sangat baik dari membran GO/CN@TNWs (91,25%) terhadap tetrasiklin hidroklorida (TCH). Kemampuan degradasi fotokatalitik membran juga didapatkan baik, dengan efisiensi fotodegradasi dari membran GO/CN@TNW terhadap tetrasiklin hidroklorida sebesar 86,825%. Oleh karena itu disimpulkan bahwa membran GO/CN@TNWs dapat digunakan untuk menghilangkan TCH dari air limbah. Kinerja fotokatalitik komposit membran tersebut dapat diaktifkan oleh cahaya matahari, memberikan potensi membran adsorpsi berbasis GO/CN@TNW dengan kemampuan daur ulang untuk realisasi pemurnian air limbah skala besar. ......Membrane fouling has been a significant challenge in applying membrane technology for wastewater treatment and purification. This study successfully prepared a recyclable g-C3N4@TiO2-nanowire (GO/CN@TNW) intercalated graphene oxide (GO) membrane through electrostatic interaction and vacuum filtration-assisted processes. The prepared membranes had higher light response activity than pure TNW due to the introduction of GO with high absorption and carrier mobility and the synergistic effect of TNW and CN. In addition, the π - π stacking interactions between GO and organic pollutant molecules contributed to the excellent adsorption efficiency of GO/CN@TNWs (91.25%) membranes against tetracycline hydrochloride (TCH). The ability of photocatalytic degradation of the membrane was also found to be good, with a photodegradation efficiency of the GO/CN@TNW membrane against tetracycline hydrochloride of 86.825%. Therefore it was concluded that GO/CN@TNWs membranes could be used to remove TCH from wastewater. The photocatalytic performance of these composite membranes can be activated by sunlight, giving potential GO/CN@TNW-based adsorption membranes with recyclability to realize large-scale wastewater purification.

Abstrak :
ABSTRAK
The study was concerned with the effects of the organic loading as food/microbe (F/M) and nitrogen concentration as BOD5: TN on the sequencing batch reactor (SBR) system efficiency and performance with 1:5 diluted-electroplating wastewater (EPWW) solutions. The results showed that chemical oxygen demand (COD) and biological oxygen demand (BOD5) removal efficiencies were almost the same with the organic loadings of 0.125-0.375 kg BOD5/m3.d. The CN- and Zn2+ loadings of 1.2-2.9 and 1.6-4.0 g/m3.d did not show strong repression effects to the COD and BOD5 removal efficiencies. In addition, the high Zn2+ removal efficiency level of 94-96% was detected. Moreover, the system did not show any difference in Zn2+ and COD removal efficiencies at the BOD5: TN ratios of 100:5-100:10. Urea and (NH4)2SO4 could be used as the nitrogen source of 1:5 diluted-electroplating wastewater solution. The highest COD, BOD5, Zn2+, CN-, Total Kjeldahl nitrogen (TKN) and total nitrogen (TN) removal efficiencies of 98.0±0.2, 97.0±0.7, 97.7±0.1, 93.3±1.2, 86.5±1.1 and 80.9±0.5%, respectively, were detected at the BOD5:TN ratio of 100:10 and (NH4)2SO4 was used as the nitrogen source. The system also showed good bio-sludge performance with the Sludge Volume Index (SVI) and Sludge Retention Time (SRT) values of 51±4 mL/g and 29±3 days, respectively.

Abstrak :
Micro alloying in High Strength Low Alloy (HSM) steel is very important role to improve the quality of those steel formation of precipitation of carbonitride such as Nb(CN) in those niobium containing steel has a significant influenced on strength. Mechanism of strength improvement due to the existing of micro alloy the precipitated in hot finishing deformation not fully studied The previous investigated use relationship between deformation and density of dislocation. HSLA steel containing 0.037% Nb was used in this research and deformation was performed using compressive plane stress, the relationship between 5 % fraction precipitate, t@__¢, and maximum stress achieved at a temperature of 9009 C under strain rare of I sec'l were evaluated. Analysis data results shows that the relationship between 5% fraction and density of dislocation can be described as, tg,? .,p"'5.

Abstrak :
ABSTRAK
Untuk menunjang fitur baru dalam jaringan telekomunikasi seperti Trimitra dan Indosat Fax Plus dibutuhkan kemampuan sentral untuk menghubungkan beberapa sentral sekaligus dalam sebuah sambungan telepon pada saat yang bersamaan (multidestination).

Algoritma Shortest Shortest Part Tree (SSP-T), Common Link (CL), dan Center Node (CN) merupakan tiga algoritma yang dapat diterapkan untuk mengatasi permasalahan multidestination statik. Ketiga algoritma ini mempunyai karakteristik yang berbeda-beda (dalam hal biaya dan waktu) apabila diterapkan pada suatu jaringan telekomunikasi.

Skripsi ini merupakan suatu simulasi dalam menentukan keputusan routing pada permasalahan multidestination statik dengan menggunakan algoritma SSP-T, CL, dan CN. Dari hasil simulasi terlihat bahwa algoritma SSP-T selalu mempunyai waktu operasi yang tercepat, sementara algoritma CN selalu menghasilkan biaya sambungan yang lebih kecil dibandingkan dengan algoritma SSP-T.

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Abstrak :
Rainfall is the primary input into rainfall-runoff modeling. Previous work indicates that the accurate representation of rainfall in time and space is important due to its influence on the hydrological response. The objective of this study is to evaluate the relevance of theoretical indices of spatial rainfall variability and the theoretical criteria of the hydrological response proposed by Emmanuel et al. (2015) in a real case study. The distributed model CINECAR has been chosen to accommodate the spatial discretization of hydrological data. The production function of the model adopts the Soil Conservation Service-Curve Number method, while the transfer function is based on a kinematic wave model. The simulations used weather radar data and also their average over the watershed, with a data resolution of 1×1 km2. They were conducted on the basis of 13 watersheds in the Gard region and four events in 2008 for each watershed. The difference between the distributed and averaged hydrographs obtained from the CINECAR model were calculated using two criteria, namely the difference in peak discharge (LQ) and the difference in peak time (TQ). The values of LQ and TQ represent the influence of spatial rainfall variability on the hydrological response. The spatially distributed rainfall was analyzed based on the values of its maximum Horizontal and Vertical Gab (HG and VG) to watershed centroid acting as indices, as proposed by Emmanuel. The analysis of the influence of spatial rainfall variability on the watershed response was conducted by quantification of the averaged and distributed hydrographs using the proposed indices and criteria. The results show that value of LQ rises by more than 50% for some events, and that TQ shows different times to peak between the average and distributed hydrographs. The values of the HG and VG indices accurately describe the rainfall distribution in the watershed. Therefore, these criteria and indices are effective in quantifying the influence of spatial rainfall variability on the hydrological modeling in particular events which are affected by rainfall distribution.