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<![CDATA[THE DESIGN AND TESTING OF ADSORPTION REFRIGERATION SYSTEM WITH TWO ADSORBERS ]]>
<![CDATA[Andi Taufan]]>;
<![CDATA[Nasruddin Nasruddin]]>
<![CDATA[ Widyariset Vol 16, No 2 (2013): Widyariset ]]>
Publisher : <![CDATA[Pusbindiklat - LIPI ]]>
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DOI: 10.14203/widyariset.16.2.2013.269-276
<![CDATA[This paper discusses design and testing of adsorption refrigeration system with two adsorbers. Main components consisted of two adsorber with 6.6 kg solidified activated carbon inside, expansion valve, evaporator, condenser, and reservoir. All of that were connected with stainless steel pipes. The test performed for 75 minutes using 250 ml of methanol pro-analysis of 99.9% as a refrigerant in the system and the water temperature is 250C which is pumped through copper pipes to cool the adsorbents. The air pressure in the system during the test were in vacuum. The average pressure difference between the adsorber and the evaporator during testing was 4.6 cmHg. The lowest temperature was 140C obtained after the 65th minute.]]>
<![CDATA[URBANISASI DAN DAYA DUKUNG LINGKUNGAN DI KOTA TANGERANG ]]>
<![CDATA[Gusti Ayu Ketut Surtiari]]>
<![CDATA[ Widyariset Vol 12, No 3 (2009): Widyariset ]]>
Publisher : <![CDATA[Pusbindiklat - LIPI ]]>
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DOI: 10.14203/widyariset.12.3.2009.171-180
<![CDATA[The purpose of this article is to know the condition of the carrying capacity of Tangerang City. The background is that Tangerang City has rapidly increased in development and population growth according to its location as a Buffer zone ofD KI Jakarta and a central of industry. A Buffer zone is hoped to be able to counter the high population growth in Jakarta by creating a harmonious development between Jakarta and its surroundings. Tangerang City acts as housing for commuters to Jakarta and have to accommodate migrants who want to work in Tangerang City. The development of housing and its facilities increase the utilization of natural resources such as land and water. Otherwise, the natural resources have limitation of capacity. The over utilization will encourage the risk of land degradation that can threaten a sustainable urban development. For its purpose, this article used data from BPS publication and other related sources, and it was analyzed descriptively. ]]>
<![CDATA[PERFORMANCE EVALUATION OF SPRAY COLUMN FOR TOLUENE REMOVAL AS A TAR MODEL FROM A GAS FLOW ]]>
<![CDATA[Suharto Suharto]]>
<![CDATA[ Widyariset Vol 14, No 3 (2011): Widyariset ]]>
Publisher : <![CDATA[Pusbindiklat - LIPI ]]>
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DOI: 10.14203/widyariset.14.3.2011.599-606
<![CDATA[Gasifi cation has become an alternative technology to convert biomass as renewable energy resource. How-ever, the utilization of gas from the process as diesel-engine fuel is hindered by the presence of tar. Used cooking oil could be used as tar absorbent medium due to its higher or nearly equal boiling point compared with that of tar component. In this study, the performance of spray column was evaluated by measuring the absorption effi ciency and mass transfer coeffi cient of volumetric tar in liquid phase (KLa). The tar used in this study was represented by toluene which was carried by air fl ow and then set as tar model in gas producer. The tar model dispersed in air was injected to spray column for absorption process with gas fl ow rate 2.580 L/min and temperature 30°C. The composition of tar model in gas phase was determined both as input and output of spray column by gas chromatography fl ame ionization detector (GC-FID). The absorption effi ciencies of toluene with absorption liquid of water, 5.4% w/w used cooking oil in water and 10.8% w/w used cooking oil in water are 70.2%, 93.8% and 95.2% respectively in 30°C, with KLa value 1.59.10-2/min, 7.10-4/min and 4.10-4/min respectively.]]>
<![CDATA[CORRELATION DIVERSITY OF BACTERIA TO SECONDARY META BOLITES Nephthea spp. from SERIBU ISLANDS NATIONAL PARKS WATERS ]]>
<![CDATA[Gintung Patantis]]>;
<![CDATA[Hedi Indra Januar]]>;
<![CDATA[Ekowati Chasanah]]>
<![CDATA[ Widyariset Vol 15, No 3 (2012): Widyariset ]]>
Publisher : <![CDATA[Pusbindiklat - LIPI ]]>
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DOI: 10.14203/widyariset.15.3.2012.509–518
<![CDATA[Bioactive compounds from biota on coral reef is potentially of plasma nutfah that has high economic value.Their existence was influenced by the microbes which associated with them and the environmental conditions. Theaim of the research was to analyze the correlation between the diversity of bacteria and secondary metabolitesNephthea spp. collected from Seribu Islands National Parks (TNKpS). The analysis of bacteria diversity performedby Terminal Restriction Fragment Length Polymorphism (T-RFLP) and secondary metabolites used High PerformanceLiquid Chromatography (HPLC). The results of study showed that the range of diversity index (H), richness(R), and evenness index (E) of bacteria were 1,47–0,88; 13–3; 0,84–0,43. And the for the secondary metabolitesthe range were 2,21–1,12; 20-5; 0,95–0,63. Further study showed that there was a significant correlation (R =0.96 at p< 0.01) between bacteria and secondary metabolites group richness. The area which high diversity ofbacteria and secondary metabolites were within central and southern TNKpS waters. This results were in line withthe best water quality in these areas.]]>
<![CDATA[PERUBAHAN IKLIM DAN PEMANASAN GLOBAL DI INDONESIA; DAMPAKNYA TERHADAP KONDISI BAWAH PERMUKAAN Studi Kasus : DKI JAKARTA ]]>
<![CDATA[Rachmat Fajar Lubis]]>;
<![CDATA[Robert Delinom]]>
<![CDATA[ Widyariset Vol 13, No 3 (2010): Widyariset ]]>
Publisher : <![CDATA[Pusbindiklat - LIPI ]]>
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DOI: 10.14203/widyariset.13.3.2010.65–70
<![CDATA[Indonesia is exposed to climate change, especially with regard to the rising sea level, changes in precipitation and extreme events. This will particularly impact to many sectors in this country. In order to evaluate the impact on subsurface environment, groundwater temperatures in boreholes can be an important source of information on recent climatic changes. Subsurface temperatures in Jakarta city were analyzed to evaluate the effects. As a result the magnitude of surface warming was increase 1.4°C which agreed with the increase of air temperature meteorological data during the last 100 years. This is the preliminary results of significant increase in climate change during the last century in Jakarta. Still today, the information on vulnerability and adaptive measures is not sufficient in order to plan and design appropriate activities on the national level in Indonesia.]]>
<![CDATA[IDENTIFICATION AND COMPOSITION OF FEEDING PLANTSPECIES OF SIMAKOBU MONKEYS (Simias concolor) IN NORTHERN SIBERUT, MENTAWAI ARCHIPELAGO ]]>
<![CDATA[Nurul Silva Lestari]]>;
<![CDATA[wendy Erb]]>
<![CDATA[ Widyariset Vol 14, No 2 (2011): Widyariset ]]>
Publisher : <![CDATA[Pusbindiklat - LIPI ]]>
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DOI: 10.14203/widyariset.14.2.2011.323-332
<![CDATA[The availability of food resources is one of habitat components that support simakobu conservation. This study was aimed to identify the species and composition of feeding plants and habitat structures of simakobu. Habituation of simakobu was conducted in prior to the study. Afterwards it was performed to collect the data on species and composition of feeding plants of simakobu using ad libitum methods. Determination of the structure and composition of vegetation on simakobu habitat, vegetation analysis was done by establishing plot measuring all long 100 m for 15 plots. Result showed that amount of 116 plant species was eaten by simakobu. Katatairek (Bhesa paniculata), logauna (Knema sumatrana) and ungla (Aporosa symplocoides) were species that its parts were most widely used as food source of simakobu. Young leaves, leaf bud, fl ower and fruit parts of those speciesare eaten by simakobu. This study suggests that the dominant plant species on the simakobu habitat is Logauna (Knema sumatrana).]]>
<![CDATA[AROK’S LEADERSHIP FROM THE ASTHABRATA PERSPECTIVE IN AROK DEDES NOVEL BY PRAMOEDYA ANANTA TOER ]]>
<![CDATA[I Wayan Nitayadnya]]>
<![CDATA[ Widyariset Vol 16, No 1 (2013): Widyariset ]]>
Publisher : <![CDATA[Pusbindiklat - LIPI ]]>
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DOI: 10.14203/widyariset.16.1.2013.81-92
<![CDATA[The concept of leadership is not only useful for the leader but it is also useful for everyone who is led, meaning that by understanding the concept of good leadership, a leader will be able to do what he should do and how the follower should shows their loyalty and dedication to the leader. By using the leadership role contained in the Arok Dedes novel written by Pramoedya Ananta Toer, the objectives to be achieved in this study were (1) reveals patterns how Arok leads, (2) reveals leadership perspective of Asthabrata Arok, and (3) knowing the relevance Arok leadership in relation to the present leadership and the future leadership. The method used in the data collection is the literature study. The data analysis is carried out by reconstruction and reflection text (text meaning), then proceed with interpretation by evaluating the perspective of Asthabrata leadership and correlate the text with the concept of leadership in the future leadership. The result of the analysis shows that the leadership pattern of Arok reflects strong leadership and fairness. Arok leadership represents the leadership of Asthabrata. The character of leadership is very relevant to be applied in order to leading a nation in which experiencing a crisis of leadership like today.]]>
<![CDATA[PERFORMANCE ANALYSIS OF PSO-PD CONTROLLER IN CONTROLING THE RIGID GANTRY CRANE SYSTEM ]]>
<![CDATA[Rifa Rahmayanti]]>;
<![CDATA[Qidun Maulana Binu Soesanto]]>;
<![CDATA[Edwar Yazid]]>
<![CDATA[ Widyariset Vol 4, No 2 (2018): Widyariset ]]>
Publisher : <![CDATA[Pusbindiklat - LIPI ]]>
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DOI: 10.14203/widyariset.4.2.2018.133-142
<![CDATA[Karya tulis ini membahas tentang algoritma particle swarm optimization (PSO) untuk mengoptimalkan penguat pengendali PD yang dinamakan pengendali PSO-PD. Efektivitas algoritma pengendali yang diusulkan diuji dengan menggunakan fungsi step dan dibandingkan dengan pengendali PD berbasis Zigler-Nichols (ZN-PD). Hasil simulasi yang didapatkan menunjukkan bahwa pengendali PSO-PD menghasilkan waktu naik dan waktu puncak yang lebih lambat dibandingkan dengan pengendali ZN-PD, tetapi memiliki waktu tunak yang lebih cepat dan nilai overshoot yang kecil di bawah trayektori yang didefinisikan.Kata kunci: Sistem gantry crane, PSO, Gain PD, Sudut ayunan AbstractThis paper presents the particle swarm optimization (PSO) algorithm to optimize the gains of the PD controller to form what so-called the particle swarm optimization (PSO-PD) controller. The effectiveness of the proposed control algorithm is tested under constant step function and compared with Ziegler-Nichols (ZN-PD) controller. Simulation results show that proposed controller has slower rise time and peak time than ZN-PD controller as well as small overshoot under the predefined trajectories.]]>
<![CDATA[PEREKAM/PEMUTAR SUARA DIGITAL BERKAPASITAS BESAR UNTUK APLIKASI EMBEDDED SYSTEM ]]>
<![CDATA[- Yoppy]]>;
<![CDATA[Waru Djuriatno]]>;
<![CDATA[- Suprapto]]>
<![CDATA[ Widyariset Vol 13, No 2 (2010): Widyariset ]]>
Publisher : <![CDATA[Pusbindiklat - LIPI ]]>
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DOI: 10.14203/widyariset.13.2.2010.99-106
<![CDATA[In embedded-system designs that involve just a small capacity voice-recorder, one may use EEPROM or voice-recorder IC. However, sometimes one needs a high capacity voice recorder also. In this case, EEPROM can’tfulfill the needs anymore because it’s hard to get EEPROM with capacity even at 512 kbyte. Meanwhile, the ISD® voice-recorder IC could store voice up to 16 minutes only. For this background, the writer proposes a high-capacity digital voice recorder which is able to record voice for several hours. It uses SD Card as the storage media.. With sampling rate at 8 kHz/8 bit and 512 MB SD Card, the recorder can store voice until 18 hours. The recorded voices are stored in WAV file format so that can be transfered from and to PC when needed.]]>
<![CDATA[ANALISIS PARAMETER OPTIMUM PENYERAPAN KATION ZN(II) OLEH BIOMASSA Hydrilla verticillata ]]>
<![CDATA[Meyrina Eka Putri]]>
<![CDATA[ Widyariset Vol 17, No 3 (2014): Widyariset ]]>
Publisher : <![CDATA[Pusbindiklat - LIPI ]]>
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DOI: 10.14203/widyariset.17.3.2014.374-379
<![CDATA[Hydrilla verticillata has a functional group that has free electrons. If the functional group is contacted with a solution containing heavy metals, it will form a bond with the metals. This study aims to determine the uptake ca- pacity of Hydrilla verticillata biomass in optimum condition and its reaction kinetics using measurement methods Atomic Absorption Spectrophotometer (AAS). Based on the research that has been done, the optimum conditions of Zn2+ cation absorption by Hydrilla verticillata biomass is at pH 5, its contact time is 120 minutes, and its maximum absorption capacity is 125 ppm. The order reaction Zn2+ cation absorption by Hydrilla verticillata biomass is 1.]]>
