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Search results for , issue "Vol 5, No 2 (1988): Jurnal Penelitian Hasil Hutan" : 12 Documents clear
PENGGUNAAN FOTO UDARA DALAM PENILAIAN KERUSAKAN TAJUK AKIBAT EKSPLOITASI HUTAN Sumantri, Ishak; Endom, Wesman
Jurnal Penelitian Hasil Hutan Vol 5, No 2 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (6769.131 KB) | DOI: 10.20886/jphh.1988.5.2.85-92

Abstract

An investigation of the impact of logging operations on crown damage by using the aerial photograph  of forest  areas of PT. INHUTANI II in Pulau Laut, South Kalimantan was carried out.The results of the investigation lead to the following conclusions:1.  Panchromatic   black and white  aerial photograph of 1:20.000 scale is good  enough  to  use for  evaluating  the damage of dominant and codominant crowns and crown  closure of the trees. It is found that  the crown of  11 trees/ha  were damaged, consisted of 9 tree crowns were damaged partially and  2  tree crowns  were damaged  totally.2.   Steeper terrains  caused  larger decrease  of  crown closure  of  the  trees. On  the slope  of  0-15%,  25-45% and 45%  and above, the  crown  closure  reductions   were  61%, 76%  and 80%,  respectively
PRODUKTIVITAS DAN BIAYA ANGKUTAN TRUK DI TIGA KPH PERUMPERHUTANI, JAWA TENGAH Sianturi, Dulsalam Apul
Jurnal Penelitian Hasil Hutan Vol 5, No 2 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4052.778 KB) | DOI: 10.20886/jphh.1988.5.2.37-41

Abstract

 An  investigation  on  truck   hauling of  logs  has been carried out  at three Perhutani  Forest  Districts in Central Java, in 1980, 1981 and 1982. The investigation comes to the following  conclusions: Annual   working  days  for gasoline trucks  range from  689 to l,676   hours with  an average  of 1,240 hours, and that for diesel trucks from  671 to 811 hours with an average of  790 hours.Effective  hauling output of gasoline iruchs in ton-km/year  ranges from 9,833 to 65,482  with an average of 33,000, and that  for  diesel  trucks  from  6,683 to  108,948 with  an average of  33,650.Hauling cost by  gasoline  truck in Rp per ton-km for  the years  1980, 1981, 1982  increases from year  to year,  namely Rp  95, Rp  128 and Rp  169, and that by diesel truck  Rp 78, Rp  80 and Rp 83, consecutively.                                          Hauling cost  by gasoline  truck  is higher than  that  by diesel truck.The highest component cost of hauling logging by gasoline truck  is fuel, i.e. 43 percent, and that at diesel  truck, spare parts, i.e. 62 percent
ANALISIS KIMIA 6 JENIS KAYU JAWA BARAT Ando, Jacob
Jurnal Penelitian Hasil Hutan Vol 5, No 2 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1688.348 KB) | DOI: 10.20886/jphh.1988.5.2.50-51

Abstract

The result  of  chemical analyses of 6 wood species from  West Java is presented  in this report.  The analyses comprised of determination of  cellulose,   lignin,  pentosan   and  extractive  contents.The result shows  that  specific  gravity  ranges from  0.40  to 0.47,  cellulose  content   from  45.4  to  60.6 percent, lignin from  22.5 to 33,2  percent,  pentosan  from  15,1 to 18, 7 percent  and extractive from  0.8 to 2.7 percent. 
MODEL PENDUGAAN LIMBAH DALAM PENGUPASAN VENIR KAYU MERANTI DAN RAMIN Basuki, Suwidji; Effendi, Rachman
Jurnal Penelitian Hasil Hutan Vol 5, No 2 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4526.521 KB) | DOI: 10.20886/jphh.1988.5.2.71-76

Abstract

The  wood  waste  in plywood  manufacturing can  be used as fuel  in the boiler so it is worth  while  to know  how  much waste  is produced.  The data  obtained  can  be used as input  to determine   the amount  of fuel   to be purchased  from  outside source.In  plywood  making most waste  is produced at peeling  process, i.e. at rotary cutter,  it could  make  up  to 80  % of the  total  waste produced.This  study showed   that  the  waste  of  individual log  is significantly affected by log diameter and  log quality,  the relationship  is given  by regression  model.  
PERCOBAAN PEMBUATAN DEKSTRIN DARI TEPUNG SAGU (Metroxylon spp.) Ando, Yacob; Silitonga, Toga
Jurnal Penelitian Hasil Hutan Vol 5, No 2 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4126.56 KB) | DOI: 10.20886/jphh.1988.5.2.42-46

Abstract

The experimental study of dextryn manufacture was conducted at the Forest Products Research and Development Centre laboratory in Bogor. The sago flour was obtained from Riau, originally extracted from female sago as signified by the absence of spine on the leaves.                     The sago starch was manufactured into dextryin at 80oC starting reaction temperature. Prior to the reaction sufficient amount of sago starch was bleached with 1% CaOCl2. The starch was allowed to settle down and dried. Umbleached sago starch was prepared as control. During the dextryn manufacture the HCl was gradually sprayed to the starch while elevating the temperature to 120oC, at which it was maintained for 2 hours.            The reaction products were then tested and the properties compared with that of the existing standard. The quality of the dextryn manufactured was evaluated and discussed. The result of the experiment was slighty inverior compared with that of the superior and prima quality due to the low dextryn content.
SERANGAN KUMBANG AMBROSIA PLATYPUS TREPANATUS PADA DOLOK RAMIN Sukartana, Paimin
Jurnal Penelitian Hasil Hutan Vol 5, No 2 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2643.987 KB) | DOI: 10.20886/jphh.1988.5.2.68-70

Abstract

The infestations of ambrosia beetle Platypus trepanatus Chap. (Coleoptera:  Platypodidae)    on  felled  ramin trees (Gonystylus bancanus  Kurz.)  were studied  in a logging area of  West Kalimantan. Three felled ramin trees, d.b.h,  approximately 25  cm,  were prepared  for  the  beetle  infestations   on  their  felling  sites  for 20 days.  Six sections of each  trunk, each of  0.5 m length, which  were consecutively arranged at intervals 2.0 m started  from  the basal, were observed.  Number of  the  beetle  tunnels  on each trunk  section  were counted, and diameter,  area of surface, and volume  of the trunk  sections, were  measured.More  tunnels   were  found   on  the  larger diameter  of  trunk  sections.  However,  analyses  of  the  data showed  no  discernible  trends  for  the  intensity   of  the  beetle  attacks   in  different   trunk  sections  and  that  the size  as well.  Those,  the increasing number  of  the  tunnels  of  the  beetle   is in lines   with  the increase  of  the  host  sizes.
FAKTOR EKSPLOITASI MERANTI DI SUMATRA BARAT, KALIMANTAN BARAT DAN KALIMANTAN SELATAN Dulsalam, Dulsalam
Jurnal Penelitian Hasil Hutan Vol 5, No 2 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2082.583 KB) | DOI: 10.20886/jphh.1988.5.2.47-49

Abstract

A  study  on recovery in Meranti  logging operation  was carried out  in West Sumatra  and  West  Kalimantan  in 1984, and in South  Kalimantan  in 1985. The purpose of  this study  is to determine  recovery  figures for Meranti at  these particular locations, which may be use full  in the planning  efforts  of  logging companies.The  study  comes  to  the  following  conclusions   :Average  logging recovery for Meranti in West Sumatra, West Kalimantan and South  Kalimantan is 0.84.Recovery  among provinces  and among forest  companies  do not differ significantly,Recovery between diameter  classes differs significantly.  It  is suggested  that  logging of small diameter trees be done  with care, to avoid leaving relatively  small timber in the forest. 
PRODUKTIVITAS DAN BIAYA ANGKUTAN KAYU DENGAN REL BAJA DAN REL KAYU Dulsalam, Dulsalam
Jurnal Penelitian Hasil Hutan Vol 5, No 2 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5980.084 KB) | DOI: 10.20886/jphh.1988.5.2.52-59

Abstract

The paper presents  the result of a study  on the productivity  and cost of haulage on steel and wooden  rails.  The study was  conducted at  4 logging companies in  West  Kalimantan   during  year  1982.  There  were 2  methods of  log haulage observed, namely using locomotive and  manual  pushing.The  logging companies generally  used rail weighing  7 - 10 kg/m  and 5 x 7 cm wooden  rail. The distance between steel and  wooden  rails were  respectively 60  - 70  cm  and  60  cm  or  less.  The  crew  size  varied  from  8 to 12 men  for locomotive haulage consisting  of  12 - 16  lorries,  and  2 - 4 men/lorry for haulage on  wooden rail.  The  result  of  the haulage study  reveals also the productivity figures of respectively  156.9  m3 km/hour  and 2.4 m3 km/hour for the first and the second  methods mentioned   above.                                                                                            Log  transportation   on steel  rail  is safer for the labour compared  with  that on wooden  rail,  and the life of steel  rail is much   longer  than  that,  of  wooden rail.   Although   steel  rail is higher  in the  investment   cost  compared  with  woode'n  rail (Rp  14 - 21  million/km and Rp  2.35 million/km respectively), the average haulage cost per m3' km  is about  one-third  of the  latter  (Rp 80.1/m3 km  and Rp  254.4/m3 km respectively).
PEMBUATAN GLUKOSA DAN ALKOHOL DARI SAGU (Metroxylon spp.) Syahri, Tjutju Nurhayati; Hartoyo, Hartoyo
Jurnal Penelitian Hasil Hutan Vol 5, No 2 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1988.5.2.93-96

Abstract

A study for  production  of glucose   and  alcohol  from  sago  (Metroxylon Spp)  was conducted   on a  laboratory  scale in  the  Forest  Product Research and  Development Centre, Bogor.Treatment condition given  for hydrolysis of  sago in order   to produce   glucose  was three  levels of  sulfuric  acid  (of 0.5 N; 0,75 N and 1.0 N)  with  three levels of  temperature and pressure  (of 250°F/15psi, 259°F/20psi,  and 274oF/30psi).The  reaction time  for hydrolysis at  each  treatment combination were three levels  (of  90  minutes, 120  minutes and 150 minutes). Glucose obtained from sago hydrolysis   in this experiment  was then  fermented for producing  alcohol  by means of  Sacharomyses cereuiciae  enzym   activity    from  yeast.The  result  showed   that  glucose  yield   during  these experiment  ranged  from 42.8 to  77,6  percent. The  maximum glucose  yield is obtained from the 274°F/30psi treating  condition   and  sulfuric  acid concentration of  1.0 N  within 120 minutes of  hydrolysis time.  Until 120  minutes   of  hydrolysis  period   the glucose  yield  tend  to increase with  the increasing treatment   combination level.   The  results  of glucose tends to  decrease afterwards  at hydrolysis  period  of 1.50 minutes.The highest  alcohol  yield  is 14.2  percent and is obtained  from  fermentation  of highest  glucose yield of 77.6 percent. Based on the result of chromatographic analysis  of alcohol  revealed  that alcohol produced is classified cu. ethanol  (C2H50H)
PERCOBAAN PENYULINGAN KAYU CENDANA (Santalum album L.) DARI KUPANG Silitonga, Toga
Jurnal Penelitian Hasil Hutan Vol 5, No 2 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1988.5.2.80-84

Abstract

Cendana  oil,  an  essential  oil  extracted   from Santalum  album  L. is  an  important non  wood  forest  products from Indonesia. Recently,  there  has been a lot  of  inquiries  on  the  quality  of  the  oil obtained  from different part  of a tree and on  the effect  of processing condition on  oil properties.In  this study,  the  Santalum  album L. wood  was obtained  from  Kupang, Nusa Tenggara Timur province  of Indonesia, where  this  wood  is   native  to. The  wood  samples  were prepared  for  further  processing  in two different  sizes being those retained on and screened  out  wood  particles  of  40  mesh screen. The sample  specimens were  taken  from trunk and root parts, then  treated  in three processing  times.  The yield and the chemical properties  of the oil were measurea and recorded. A gas chromatography was employed  in determining the  santalol   content   of  the  oil  and  the  result  was analysed  and evaluated.

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