Articles
25 Documents
Search results for
, issue
"Vol 14, No 3 (2011): Widyariset"
:
25 Documents
clear
<![CDATA[THE PROPERTIES KRAFT PULP SENGON WOOD (Paraserianthes falcataria):Differences Of Cooking Liquor Concentration and Bleaching Sequence ]]>
<![CDATA[Widya Fatriasari]]>;
<![CDATA[Lucky Risanto]]>
<![CDATA[ Widyariset Vol 14, No 3 (2011): Widyariset ]]>
Publisher : <![CDATA[Pusbindiklat - LIPI ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
Full PDF (243.641 KB)
|
DOI: 10.14203/widyariset.14.3.2011.589-598
<![CDATA[The research was to investigate the difference effect of cooking liquor concentration and bleaching sequence on the properties Kraft pulp sengon wood (Paraserianthes falcataria). The Kraft pulp conditions were alkalinity (16 and 20%) and sulfi dity (20 and 25%). The maximum pulping temperature was 170°C for 4 hours, Liquor to wood ratio of 4:1 and 100 gram OD. Pulp bleaching sequences were P1 DEP2 and D1ED2P. Utilization of selected Kraft pulping was effective enough for dissolving lignin. The highest and the lowest lignin decreasing were 90% and 61% respectively. The increasing effect of alkali concentration was more dominant than its sulfi dity on the pulp delignifi cation selectivity. Generally, the optimum Kraft pulping conditions were alkalinity 20% and sulfi dity 25%. The sequence bleaching difference of the selected pulp tended on the decreasing of kappa number and pulp yield. The fi rst pulp bleaching method (P1EDP2) was relatively better than the second method (D1ED2P)]]>
<![CDATA[MICROHABITATS OF Hylarana chalconota ALONG FAST FLOWING WATER STREAMS IN DEGRADED LAND IN GUNUNG SALAK FOOT HILL ]]>
<![CDATA[Hellen Kurniati]]>;
<![CDATA[Alex Sumadijaya]]>
<![CDATA[ Widyariset Vol 14, No 3 (2011): Widyariset ]]>
Publisher : <![CDATA[Pusbindiklat - LIPI ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
Full PDF (269.263 KB)
|
DOI: 10.14203/widyariset.14.3.2011.515-524
<![CDATA[This research was conducted to determine the microhabitat selection in the frog species Hylarana chalco-nota in fl owing aquatic habitats situated in degraded land. Three survey sites (river, ditch, pine plantation) were selected in the Curug Nangka area on the slopes of Gunung Salak at an altitude between 630–740 m above sea level. Transect methodology was used to determine the microhabitat preference in H. chalconota. Two ways paired and one-way ANOVA were used to test the impact of environmental factors on the microhabitat preference of H. chalconota. A signifi cant effect of air humidity on the presence of individual frog in the river and pine plantations was observed, but other environmental factors (air temperature, water temperature, air humidity, moon phase) had no signifi cant effect on individual H. chalconota along the ditch irrigation. In selecting microhabitats, the frog prefers vegetation below the substrate. However, frogs did not select specifi c plant species;preference appears to be related to the nature of the leaf and petiole strength. In horizontal microhabitat selection, individual frog tend to choose a distance between 0-1 meters from the edge of a river or ditch, while in vertical microhabitat selection, individual H. chalconota tend to choose a distance between 0–1 m from the ground.]]>
<![CDATA[WING PLANFORM INFLUENCE ON FLIGHT CHARACTERISTIC OF ROCKET-LAUNCHED UNMANNED AIR-VEHICLE ]]>
<![CDATA[Larasmoyo Nugroho]]>
<![CDATA[ Widyariset Vol 14, No 3 (2011): Widyariset ]]>
Publisher : <![CDATA[Pusbindiklat - LIPI ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
Full PDF (635.451 KB)
|
DOI: 10.14203/widyariset.14.3.2011.633-642
<![CDATA[Design of the wing planform depended on some geometry key factors such as aspect ratio, sweep angle, taper ratio, and angle of incidence. The search for optimum fl ight characteristic could be observed from aerody-namic coeffi cients, fl ight stability, fl ight dynamic, fl ight performance, and fl ight quality. To examine the design of the wing planform, this paper presented an experiment that modify few factors of wing geometry and simulated it concerning the launching phase of the unmanned air-vehicle or UAV using rocket as booster. The optimal design of the wing is a prerequisite for the UAV to achieve its main mission as a national defense missile. Using X-Plane v 8.6 as a fl ight simulation tool, the experimental results showed that a hybrid wing could produce an intermediate grade fl ight characteristic between rectangular wing and delta wing. Rectangular wing tended to produce a highly pitch-up trajectory when catapulted by a rocket booster, while delta wing produced a more stable pitch attitude and more better fl ight performance. This experiment showed that hybrid wing was the appropriate choice for subsonic jet UAV that had to be launched by rocket.]]>
<![CDATA[THE POTENTIAL YIELD OF THREE NEW PADDY VARIETIES AT KEBON AGUNG – BANTUL ]]>
<![CDATA[Setyorini Widyayanti]]>;
<![CDATA[Kristamtini Kristamtini]]>;
<![CDATA[Sutarno Sutarno]]>
<![CDATA[ Widyariset Vol 14, No 3 (2011): Widyariset ]]>
Publisher : <![CDATA[Pusbindiklat - LIPI ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
Full PDF (234.884 KB)
|
DOI: 10.14203/widyariset.14.3.2011.559-564
<![CDATA[Food needs will increase every year due to population growth and changing patterns of food consumption, so it needs a good cultivation technology to increase the productivity and national food production. Some efforts have been done including the use of paddy new varieties (VUB). The purpose of this research was to investigate the yield of three new varieties of paddy rice fi eld in Imogiri, Bantul, Yogyakarta Province. The experiment was carried out in Jayan village, Kebon Agung, Imogiri, Bantul, Yogyakarta from August to November 2009. The experiment was arranged in a randomized block design with three new varieties of Inpari 1, Conde and Dodokan as treatments. Each treatment had three replicates and conducted in the total area of 3,000 m2. The results showed that Inpari 1 had the highest dry harvested grain crops (11.64 t / ha GKP), followed by Conde (11.28 t / ha GKP) and Dodokan (9.47 t / ha GKP), respectively.]]>
<![CDATA[THE EFFECT OF INTERCROPPING MODEL AGAINTS WHEAT AND TABACCO GROWTH AND PRODUCTION ]]>
<![CDATA[Alfna Handayani]]>
<![CDATA[ Widyariset Vol 14, No 3 (2011): Widyariset ]]>
Publisher : <![CDATA[Pusbindiklat - LIPI ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
Full PDF (216.012 KB)
|
DOI: 10.14203/widyariset.14.3.2011.479-488
<![CDATA[The aim of this research was to study the effect of intercropping model against wheat and tobacco pro-duction. The experiment was conducted in Kaliangrik-Kabupaten Magelang, Samiran-Kabupaten Boyolali, Kledung-Kabupaten Temanggung from April 2010 to October 2010.The experiment was arranged in Random-ized Completed Block Desain consisted of 3x3+2 control with 5 replications. The fi rst factor were 3 location (Kaliangkrik, Samiran, Kledung). The second factor were 3 model wheat-tobacco intercropping, i.e: model I: tobacco population is constant with wheat planted in two other sides of tobacco, model II Tobacco population is constant with wheat planted only in one side, model III tobacco population is decreased a half and is replaced by wheat population (50%). In general the most efi sien model in Kaliangkrik-Magelang was model III (50%), Samiran-Boyolali was model II (one side), and Kledung Temanggung were both model II (one side) and model III (50%) showed the highest value.]]>
<![CDATA[SPEED CONTROL DESIGN OF THREE PHASE AC INDUCTION MO- TOR USING THE SPACE-VECTOR METHOD AND PROPORTIONAL INTEGRAL CONTROLLER (PI) ]]>
<![CDATA[Slamet Slamet]]>
<![CDATA[ Widyariset Vol 14, No 3 (2011): Widyariset ]]>
Publisher : <![CDATA[Pusbindiklat - LIPI ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
Full PDF (490.728 KB)
|
DOI: 10.14203/widyariset.14.3.2011.675-682
<![CDATA[This research described about speed control of three-phase AC induction motor use space vector method and Proportional Integral (PI) controller. To determine the parameters of PI controller used Tuning Charts for PI Feedback Controllers. Measurement of motor speed used dc motor 12 volts functioned as a generator connected by Op-Amp circuit. Output Voltage Op-Amp interfaced to ADC Microcontroller as signal feedback from actual speed of triphase AC induction motor. Then in empiric is searched transfer function of the motor to determine value of the Kp (proportional gain), Ki (integral gain), θ (dead time), and τ (time constant). Testing system is done for set point maneuver from 480 rpm to 1,080 rpm, and then from 1,200 rpm to 480 rpm. Based on the result of research indicates that control system PI for speed of triphase AC motor can be controlled to reach stable condition, if maneuver set point under specifi cation of nominal speed performance of three phasa AC induction motor for 900 rpm.]]>
<![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 ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
Full PDF (192.536 KB)
|
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[QUANTITATIVE ANALYSIS AND LIGNIN HISTOCHEMICAL ASSAY OF SENGON (Paraserianthes falcataria) ]]>
<![CDATA[N. Sri Hartati]]>;
<![CDATA[Enny Sudarmonowati]]>;
<![CDATA[Suharso Suharso]]>;
<![CDATA[Kurnia Sofyan]]>
<![CDATA[ Widyariset Vol 14, No 3 (2011): Widyariset ]]>
Publisher : <![CDATA[Pusbindiklat - LIPI ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.14203/widyariset.14.3.2011.525-534
<![CDATA[The presence of lignin in plant cells is a factor limiting the effi ciency of processing lignocellulosic materials of wood-based industries including pulp and paper industry either chemically or biologically (biopulping) process using white rot fungi. Lignin content determination of sengon collected from different areas in Indonesia indicated that it ranged low to moderate category (16.58–35.59%). Lignin histochemical assay of transverse section of stems using phloroglucinol-HCl staining showed that the initiation of lignin deposition was noted in 2 weeks old seedling. Lignin quantitative and qualitative assessment through histochemical assay showed that lignin content was varied in trees depending on height]]>
<![CDATA[STUDY AND DISTRIBUTION IN OIL PORTS SHALLOWING SEDIMENTS (OIL WHARVES) PT CALTEX PACIFIC INDONESIA DUMAI, RIAU 1990 POST-DREDGING ]]>
<![CDATA[Hendra Yusran Siry]]>
<![CDATA[ Widyariset Vol 14, No 3 (2011): Widyariset ]]>
Publisher : <![CDATA[Pusbindiklat - LIPI ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.14203/widyariset.14.3.2011.643-650
<![CDATA[To study the process of rapid sedimentation occurred required an understanding of the characteristics of the sediments and oceanographic processes. This paper is to analyse source of silting up and sediment distribution surrounding oil wharves of PT Caltex Pacifi c Indonesia (PT CPI) after big dredging in 1990 during four months research and intensive survey in 18 research sampling areas. The research used gravimetric method for sediment samples identifi cation and fi eld survey for oceanographic conditions twice sampling time, fl ood tide and ebb fl ood. Data showed sediment fraction consist of sandy mud with 48.175–74.735% mud content. Classifi cation and result of sediment statistic analysis indicated wave energy and tide caused silting-up process in the surrounding PT CPI’s oil wharves. This process was sped up by the environmental conditions, reclamation and coastal land changes.]]>
<![CDATA[LOCAL RICE RESPONSE TO MENTIK POWDER TECHNOLOGY APPROACH SRI (SYSTEM OF RICE INTENSIFICATION) AND INTEGRATED CROP MANAGEMENT ]]>
<![CDATA[Kristamtini Kristamtini]]>;
<![CDATA[Setyorini Widyayanti]]>;
<![CDATA[Siti Rahayu]]>
<![CDATA[ Widyariset Vol 14, No 3 (2011): Widyariset ]]>
Publisher : <![CDATA[Pusbindiklat - LIPI ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
DOI: 10.14203/widyariset.14.3.2011.565-570
<![CDATA[Mentik wangi is one of the local rice varieties that need to be conserv and explored its potential. Therefore, research is needed that aims to determine the response of local rice fragrant mentik technology approach System of Rice Intensifi cation (SRI) and Integrated Crop Management (ICM). SRI goals and ICM on the same principle is to increase farmers’ production with different targets and different managers. Research conducted in Jayan Village, Kebon Agung, Imogiri in May 2009 (MK 2009). Research carried out on land owned by farmers with a total area of 2000 m2. Planted rice varieties are fragrant with mentik treatment 2 repeated 3 times. The fi rst treatment is the SRI technology approaches, including: age of young seedlings (14 the day after the scatterplot), spacing of 30 x 30 cm,10 tons/ha of organic fertilizer, without the use of chemical pesticides. The second treatment is the approach of Integrated Crop Management (PTT), including: age of young seedlings (14 the day after the scatterplot), spacing of 25 x 25 cm, 2 tons/hectar of organic fertilizer, 250 kg/ha Urea, 50 kg/ha Sp-36 and 50 kg/ha KCL). The results showed that the results achieved mentik fragrant rice with higher SRI approach (10.89 tons/hectar)compared with ICM technology, technological approach (9.22 tons/ha). Mentik wangi rice produced by SRI and the technology approach is pulen with ICM (SRI amilosa content = 15.65% and ICM = 15.96%), while levels of macro and micro elements mentik fragrant rice produced with higher ICM approach (Phosphor = 15.95 ppm; Fe = 2.48 ppm; Zn = 0.961 ppm; Cu = 0.426 ppm and Mg = 0.670 ppm) compared with the SRI approach (Phosphor = 15.13 ppm; Fe = 2.35 ppm; Zn = 0.648 ppm; Cu = 0.371 ppm and Mg = 0.623 ppm)]]>
