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Search results for , issue "Vol 7, No 1 (1990): Jurnal Penelitian Hasil Hutan" : 6 Documents clear
PENGARUH TANJAKAN DAN VOLUME MUATAN TERHADAP PRODUKTIVITAS LORI DORONG DI HUTAN JATI Dulsalam, Dulsalam
Jurnal Penelitian Hasil Hutan Vol 7, No 1 (1990): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3499.259 KB) | DOI: 10.20886/jphh.1990.7.1.8 - 11

Abstract

An  investigation on the effect of slopes and load volumes  on the productivity  of hand lorry was carried out  at Padangan Forest  District, Unit II Perum Perhutani,  East Java, in 1983.  In the investigation,  four  levels of slopes  (i.e. 3, 4, 5, and 6 percent), four  levels of  load volumes  (i.e. 3.5, 4.0, 4.5, and 5.0 m3) and the crew of 4 workers were used.  The objective was to find  the productivity of  hand  lorry  opearating  on several slopes  and  with  several load volumes. The results reveal that:The productivities of log hauling by hand lorry ranged from : 7.16 to 25.09  m3km/hour   with an average of 16.46  m3km/hour.Higher slope and load volume  caused the decrease in lorry productivity.The relation  of productivity (Y), slope (X 1) and load volume (X2) can  be expressed  by  the following  equation  of linear multiple regression: Y  = 48.626 - 2.199X1 -  5.342X2 with  R2 = 0.58Slopes and load volumes  have highly significant  effect  on productivities.
PENGARUH PENAMBAHAN UREA DAN AMONIUM KARBONAT PADA PEREKAT UREA FORMALDEHIDA TERHADAP EMISI FORMALDEHIDA DAN KETEGUHAN REKAT TRIPLEKS JABON Sutigno, Paribotro; Santoso, Adi Santoso
Jurnal Penelitian Hasil Hutan Vol 7, No 1 (1990): 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.1990.7.1.12 - 16

Abstract

The problem in using plywood bonded with urea formaldehyde  (UF) is formaldehyde   emission, especially in a room with limited ventilation.  To  reduce  formaldehyde emission,   the glue  can be mixed  with  catching agent. In this paper the effect of  urea and  ammonium   carbonate  as catching  agent  on  formaldehyde emission   and  on  bonding  strength  of  UF bonded  three plies made from jabon  is discussed.The effect of catching agent  type on formaldehyde emission  is  not  significant    while  the  effect of percentage of catching  agent is highly  significant on  formaldehyde   emission. The  higher percentage of catching agent,  the lower formal dehyde  emission  of plywood.The effect of type and percentage  of  catching  agent  on plywood bonding strength  is  highly  significant. The  higher percentage  of catching agent,  the lower plywood  bonding strength.To meet  formaldehyde emission  of  0,165 µg/ml  it  is recomended to use urea  14%  on  the  weight basis of liquid  UF. The bonding strength  of this plywood conforms   with  the Japanese standard, 1973.
PERBAIKAN BEBAN KERJA KERJANTARA DALAM KEGIATAN PENEBANGAN SECARA MEKANIS MELALUI PENERAPAN PRINSIP ERGONOMI Soenarno, Soenarno; Idris, Maman Mansyur
Jurnal Penelitian Hasil Hutan Vol 7, No 1 (1990): 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.1990.7.1.17 - 24

Abstract

Tree felling  operations in  Indonesia are commonly  done by  standing or bending  workers,  using chain saws.  These techniques cause  high  stump residues  (about  8.94%)  and  increase  workers' energy  consumption by 12% for standing and 55% for bending  workers' positions.From ergonomics point of  view, above techniques cause  body position to be less natural,  produce longer static muscular work,  reduce  work hours, create early fatique  and physiological effect  like work stress.This  paper described  the  effect of  improved felling method on work  stress of  chain saw  operators  and  construction wood production.  An investigation was carried out in two private forest companies in Central Kalimantan  in 1988. The results are as the following:The  improved  felling  method decreases  work  stress  of  chain  saw  operators;  showed   by the reduction  of pulse  rate to the amount  of 13-15 beats/minute.                                                                          The  improved  method  of felling  trees with  buttress  heights  of  < 50 cm and 50-150    cm cause the increase in construction  wood products  about  0.354  m3 and 0.542 m3  per  tree felled,  respectively.
PENGARUH METODE DAN WAKI'U PENYULINGAN TERHADAP RENDEMEN DAN SIFAT FISIKO KIMIA MINYAK KENANGA Wiyono, Bambang
Jurnal Penelitian Hasil Hutan Vol 7, No 1 (1990): 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.1990.7.1.25 - 27

Abstract

This paper  described   the study on  the  effect   of  distilling  time and methods  on yield and pysiocheical properties of  cananga  oil.  The  distillation   methods   applied   were  water  distillation an  water steam  distillation with   the  distilling time  being  8, 16, and  24  hours, consecutively. The  results  were analysed  using  the  randomized completely block  design, and the difference  between means were tested  with  the Least  Significant  Difference  method.The  results  showed that  the  distilling method appeared   to  have  significant   effect   on  the  saponification and ester numbers whereas, the oil yield was  significantly increased  with prolonged distilling time. Water distillation method produced higher quality of  cananga  oil than that produced by  the water-steam distillation  one.  This was indicated  by a higher ester number  of  the oil obtained  by  the water  distillation.
ANTROPOMETRIK PENEBANG JATI DI BKPH BANDUNGSARI KPH PURWODADI PERUM PERHUTANI UNIT JAWATENGAH Suhartana, Sona; Idris, Maman Mansyur
Jurnal Penelitian Hasil Hutan Vol 7, No 1 (1990): 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.1990.7.1.28 - 33

Abstract

Anthropometric  data  of  the  workers  are essential  in  the practice of  ergonomics,  especially  for  the  design of  work places,  machines  and equipment in order to attain work comfort and increased  work productivity.Anthropometric measurements were carried out to 18 teak loggers aging between  20-35 years. The measurements included: body,  shoulder, elbow  and hip  height;  shoulder  and hip  width; length  of arm and. hand, length  of upper arm, lower arm and  hand;upper   reach  and  arm  span (measurements in  standing   position).   In  sitting  position, the  body measurements comprised  sitting,  elbow,  hip and knee  height;  length  of upper and lower log.The  result shoures  that  elbow  height  of  teak  logger has high  variability  and decreo,se their working comfort and productivity.  Lenght of arm and hand  which  are longer than axe handle  on the other hand speed  up working  fatique  and infficient work.
STUDI LIMIT DIAMETER PADA SISTEM TEBANG PILIH HUTAN ALAM Dwiprabowo, Hariyatno
Jurnal Penelitian Hasil Hutan Vol 7, No 1 (1990): 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.1990.7.1.1 - 7

Abstract

Indonesian Selective Cutting (Tebang Pilih  Indonesia) as a silviculture  system  pays  a  considerable  attention to the growth  of seedlings  and saplings in  the forests  as it is considered  to represent  the fourth generation  in the succession  of the  tropical  rain forests. However, there is some question as to how  to relate  the growth  to the detennination   of cutting diameter   limit  quantitatively   such  that  in detennining   the diameter  limit  the growth  of  the seedlings can  be. part  of  the objective  to be considered.With  regard  to  this  problem a  study was conducted  in S. Seruyan Hulu  and  S.  Jelang - S. Delai  forests, Central Kalimantan, to examine the relationship between the height  of seedlings of  meranti  species  (Shorea  spp.)  and tress basal area in several sample  plots.   The  relationship  expressed   in  a  polynomial  regression equation  then  was used  to find  the optimal  diameter  limits  with a criterion  of maximizing   the height  of the seedlings.The  study showed   that  the optimal  diameter  limit  was dependent   upon  the  trees basal area and  the distribution  of trees diameters  of the stand.

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