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Articles 7 Documents
Search results for , issue "Vol 9, No 2 (1991): Jurnal Penelitian Hasil Hutan" : 7 Documents clear
ESTIMATING THE DETBBIORATION OF RAMIN LOGS GAUSED BY THE AMEROSIA BEEILE PLATYPUS TREPANATUB CHAP. (COLEOPTERA: PLATYPODIDAR)ⁱ sukartana, Paimin
Jurnal Penelitian Hasil Hutan Vol 9, No 2 (1991): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1602.37 KB) | DOI: 10.20886/jphh.1991.9.2.59 - 62

Abstract

Kerusakan dolok karena serangan kumbang ambrosia Platypus  trepanatus Chap. (Coleoptera:’Platy pedidas) termasuk masalah terpenting dalam usaha penebangan pohon ramin (Gonystylus baneanus kurs.) selama ini penentuan derajatkerusakan karena serangan kumbang penggerek  tersebut  hanya dihitung berdasarkan jumlah lubang gerak   yang terdapat  pada permukaan dolok. Tampa memperhatikan perkembangan serangan di dalamny.Suatu metode penelitian dihembangkan perkembangan untuk menentukan tingkat kerusakan kayu berdasarkan pols penembusan lubang gerek serangan kumbang di dalam dolok. Dalam penelitian ini dilalukan penghitungan jumlah lubang gerak yang menembus dolok pada berbagai tingkat kedalaman.hasil analisis menunjukkan bahwa persamaan regrasi                                                Y = 97,91+ 26,53X ­ 10,51X2+0, 71X3dimana: Y =nisbah jumlah  lubang gerek pada  tiap tingkat kedalaman terhadap jumlah lubang pada permukaandolok (%)  X= kedalaman bagian kayu dari permukaan dolok (cm)dapat digunakan sebagai dasar perhitungan tingkat kerusakan atau renderaen dolok ramin yang diserang oleh kumbang penggerek tersebut.                                                   
SIFAT VENIR DAN KAYU LAPIS 9 JENIS KAYU DARI JAWA BARAT lskandar, M I; Kliwon, Suwandi; Sutigno, Paribotro
Jurnal Penelitian Hasil Hutan Vol 9, No 2 (1991): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (14429.225 KB) | DOI: 10.20886/jphh.1991.9.2.89 ­ 94

Abstract

A  study result on the suitability of  9 wood species  from   West  Java  as raw material for  veneer and plywood is reported in this paper study  conaisted of  log peeling characteristic, veneer property   and some  physical/ mechanical properties  of plywood  (triplex and multiplex):All  of the logs  from 9 wood species could be peeled in cold condition, producing 1.5 mm veneer at a cuting angle between 90°30-91°30. The average shrinkage of veneer  is  7.21%, with a minimum of 4.08% (Enteroloblum)  and maximum 10. 75% (keruing). Veneer swelling from oven-dry to air-dry  condition varied between 2.04% (Enterolobium)  and 4.28%  (Damar)  with an average of  2.93%.The bonding strength of plywood  from 6 wood species (66%.) conform with the Indonesian standard fo  type 11 or water resistant, all wood  species conform with Japanese and German standard.The specific gravity of multiplex (0,60) is  higher than triplex (0,58). Some mechanical properties of multiplex are higher than triplex.
SAFAT PEMESINAN 10 JENIS KAYU DARI DAERAH SULAWESI UTARA Rulliaty, Sri; rachman, osly
Jurnal Penelitian Hasil Hutan Vol 9, No 2 (1991): 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.1991.9.2.82-88

Abstract

machining properties of ten wood species from north Sulawesi was studied. the sampie  materiawas tested using ASTM D-1666-64, that was modified to forest products researeh institute report No. 160 (1982). firatiy,the;samples (25 pieoes/species) were dried to an equilibrium moisture content condition (15 or 18 % of MC). the machine-ing properties examined were paining, shaping, boring,turning and the percentage wood defect recorded.                the result shows that, five wood species has fair to very good machining properties i.e.Dysoxylum sp. elmerillia ovalis, lophopetalum javenicum,pangium edule and serianthes minahassae.the remainders has good to very good machine-ing properties, whereas three wood secies i.e. aglaia versteghii.lapiacea subintegerrima and neonaudes sp. better than others.  
ANALISIS.KERAPATAN JALAN HUTAN BERDASARKAN HASILPENAFSIRAN FOTO UDARA DAN SURVEl LAPANGAN: STUDI KASUS PT.INHUTANI II Sumantri, Ishak
Jurnal Penelitian Hasil Hutan Vol 9, No 2 (1991): 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.1991.9.2.53-58

Abstract

Forest road network has a very important role in tranaporling logs fram the frest to processing site or logyard. The investigation of forest road density by using theaerial photo of l : 20.000 and 1: 60.000 scales had been conducted.The scope of the aerial photo is the second five-year working plan of PT. lnhutani 11 Pulau Laut, South kelimanten. The results are. as follows :1.Based on aerial photo interpretation, forest road density is 7,6 m/ha.2.Based on average skidding distance, and road construction and road maintenance costs, road denvities ha and 17,4 m/ha. respectively.3. Actual forest road density in PT. lnhutani II forest area is not optimum yet because it is far less than optimum values resulted from calculation based on average skidding distance and road construction and maintenance costs.
Kemungkinan nitrifikasi dapat menghantar pembentukan organik nitrogen pada lingkungan yang kaya akan bahan organik Sudradjat, R
Jurnal Penelitian Hasil Hutan Vol 9, No 2 (1991): 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.1991.9.2.70-81

Abstract

Penelitian ini bertujuan untuk mengetahui kemungkinan proses nitrifikasi menghantarkan terjadinya proses nitrosasi yaitu   reaksi antara  N02 atau NO3  sebagai produk  nitrifikasi, dengan polyphenol  dari Jerami atau  lignin dengan mem- bentuk senyawa organik nitrogen non biomas. Dengan proses nitrosasi atau perubahan status mineral nitrogen menjadi organik nitrogen akan membantu mengurangi terhanyutnya mineral nitrogen pada aplikasi pemupukan tanaman dengan pupuk nitrogen pada tanah gundul, atau lahan hutan non produktif yang mengandung sedikit bahan organik. Hal tersebut disebabkan sifat organik nitrogen yang lebih lambat terdekomposisi.Terjadinya proses nitrifikaai diamati melalui peningkatan kadar organik nitrogen biomas dan non biomas dengan menggunakan kontrol penghambat  nitrifikasi yaitu  nitrapirin, asetilen serta campuran  asetilen, NaCI03.  dan kaptan. Selanjutnya organik nitrogen diidentifikasi dengan spektrofotomefer  infra-merah untuk mengetahui kandungan senyawa kimia  yang lebih spesifik.Hasil penelitian menunjukkan  bahwa proses nitrifikasi untuk  substrat jerami dan  lignin berlangsung dengan baik seperti ditunjukkan  dengan penurunan kadar NH4   Proses nitrosasi cenderung berlangsung pada penggunaan substrat lignin yaitu  dengan meningkatnya kadar organik nitrogen pada sample yang tidak dihambat dibandingkan dengan yang dihambat proses nitrifikasinya.  Evaluasi sulit dilakukan untuk substrat jerami oleh karena rendahnya  penghambatan proses nitrifikasi (40 ­   66%), pengaruhh bakteria mineralisasi dan pengaruh kaptan yang  mengurangi kadar biomas  nitrogen di samping juga menghambat pertumbuhan fungi.Analisis absorpsi frekuensi menunjukkan terjadinya pembentukan nitro dan oksim pada sempel yang tidak dihambat proses nitrikasinya. Keberadaan oksim menunjukkan kemungkinan berasal  dari  tautomerisasi nitroso grup  bagai  hasil proses nitrosesi.
PRODUKTIVITAS DAN BEBAN KERJA OPERATOR GERGAJI RANTAI, PADA KEGIATAN PENEBANGAN POHON BERBANIR TINGGI DI HUTAN ALAM DI KALIMANTAN TENGAH Idris, Maraan Mansyur; Soenamo, Soenamo
Jurnal Penelitian Hasil Hutan Vol 9, No 2 (1991): 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.1991.9.2.45 - 52

Abstract

In general, there are three basic  types/methods  of  chain saw operator's body position  in doing mechanical tree felling in natural forest i.e; felling with squat, felling with standing in deeply bending forward and standing while both arms in extreme position  in the soulder joint.  However, the body Position of chain saw operator in high buttress tree felling are usually in standing while both arms in extreme position in the shoulder joint.The extreme  body position  above does not  only  generate static  muscular load  cauaing early fatique and  pain in the shoulder joint  (Hagberg, et al,  1987) but also cause physiological load during work (Ayaz,.1987).   For this matter, a  study   was conducted  for  the  improvement  of  worker's productivity  and  workstress by introducing a new methbd of body position's felling technique.The investigation took place at Central Kalimantan in 1989. The results of this research as follows:1.From faal variable point of view, the chain saw operator's workstress during work is higher than the limited works-tress level recommended by international medical opinion.2.New  felling technique applied on  high buttress tree of  150 to 300 cm can reduse workstress rate about 3-8 beats/min.  While, if  it  is  applied on high buttress tree of > 300 cm causes the operator chain saw's workstres about 1-4  beats/min lower than operator chain saw's workstress. in felling of tree with conventional method.3.Productivity rote with new felling method applied on buttrea  high of 150 cm -  300 cm and > 300 cm are about 19.298rm3/hr and 18.207  m3/hr. The productivity rate with conventional method applied on high buttress of 15’0 cm -300  and> 300 cm are 22.974 m3/hr and 24.974 m.3/hr.4.Altliough the use of new method  on high buttrea  tree felling causes negative effect in work productivity  but in fact it can increasethe forest wood utilization.about  2.63% -4.27%.
PENGARUH PENAMBAHAN UREA DAN AMONIUM KARBONAT PADA PEREKAT UREA FORMAIDEHIDA TERHADAP EMISI FORMALDEHIDA DAN SIFAT FISIS-MEKANIS PAPAN PARTIKEL Sutigno, Paribotro; Santoso, Adl
Jurnal Penelitian Hasil Hutan Vol 9, No 2 (1991): 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.1991.9.2.63 - 69

Abstract

The  formaldehye  emission  of  particleboard  bonded   with  urea  formaldehyde  (UFJ  cain  affect  human  hseith. sepecially if It  used  in a room with limited ventilation. To reduce formaldehyde emission,  the glue can be  mixed with catching agent.  In  this paper, the effect  of  using  urea and  ammonium carbonate as catching agents  on   fermaldehyde emission,and on the physical and mechanical properties of UF bonded particleboard  is described.the effect of catching agent type on formaldehyde emission is not signifivant while effect of percentage,of catching agent is highly significant on formaldehyde emission. The higher  the percentage  of catching agent, the lower  formaldehye emission of particleboard. The formaldehyde emission reaches  the requirement (max. 1  ug/ml) at the leve of  18% of amntonium carbonate or 14%  of the mixture of ammonium carbonate and urea. Type  and percentage of catching agent aflect   water absoprtion, thickness  swelling, internal bond strength,shear  strength and modulus of rupture,but not the modulus of elasticity. 

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