Judul: Penentuan Jumlah Bidang Sadap pada Penyadapan Getah Pinus dengan Metode Bor di PT Kencana Hijau Binalestari
Abstrak: Metode penyadapan yang digunakan dalam menyadap getah pinus saat ini menggunakan metode quarre.Metode penyadapan ini mudah diimplementasikan namun penggunaan metode ini menyebabkan tingginya tingkat kerusakan pada pohon yang disadap.Untuk meminimalisir tingkat kerusakan pada pohon maka digunakan alternatif metode penyadapan yaitu metode bor. Tujuan penelitian ini adalah memperoleh getah dengan jumlah bidang sadap yang optimal dalam satu pohon dengan meminimalisir tingkat kerusakan.Pohon pinus disadap menggunakan bor mekanis yang kemudian diberi stimulansia.Rancangan percobaan yang digunakan adalah Rancangan Acak Lengkap Faktorial. Data diperoleh dari enam perlakuan yaitu jumlah bidang sadap: dua sampai lima bidang sadap. Setiap perlakuan menggunakan 10 pohon contoh yang berdiameter ≥20 cm. Hasil penelitian menunjukkan semakin banyak jumlah bidang sadap maka produksi getah pinus pada satu pohon akan semakin besar, namun lama penyadapan pada satu pohon didapatkan semakin menurun. Laju pertambahan produksi getah akibat penambahan bidang sadap akan meningkat sampai dengan lima bidang sadap pada penggunaan stimulansia ETRAT®dan empat bidang sadap pada penggunaan stimulansia Campuran .
Keyword: bidang sadap, metode bor, pinus, produksi getah

Judul: Penentuan Jumlah Bidang Sadap pada Penyadapan Getah Pinus dengan Metode Bor
Abstrak: The current method of tapping pine resin is quarre method. A method of tapping is simple to be implemented, but using this method causes the high level of damage to the tree. In order to decrease the rate of the damage, drill method can be used as an alternative. The purpose of this experiment was to find out the optimum number of tapping areas to obtain an optimal productivity of resin in one tree. Pine trees were tapped using a mechanical drill and stimulant was then sprayed. Experimental design used was completely randomized design (CRD). The data were obtained from the six treatments, i.e., one to six of tapping areas on the sample trees with a diameter ≥30 cm. Each treatment consisted of 10 sample trees. The results showed that resin production in line with quantity of tapping areas, but the average resin production per tapping area will be lesser. The rate of resin production increased up to three tapping areas per tree. The addition of tapping areas more than three reduced rate of production. The optimum quantity of tapping area by the drill method in pine trees are three tapping areas. The average production from that optimum method is 38.02 gr/tree/day
Keyword: tapping, resin production, pine trees, drill method

Judul: Comparison of HIV Model with and without Time Delay
Abstrak: Acquired immunodeficiency syndrome (AIDS) is the reduction of the human immune system. AIDS is caused by human immunodeficiency virus (HIV). No medicine has been found for this desease until recently. An AIDS therapy is usually performed with highly active antiretroviral therapy, namely reverse transcriptase inhibitors, protease inhibitors and combination of both. Various models have been developed to explain the immune system of patients with AIDS, namely the HIV, response and the time delay model. This paper discusses the comparison between the dynamics of the HIV virus, the dynamic response of protease inhibitors and dynamics of time delay. The dynamics model of HIV is influenced by the level of white blood cells produced and the rate of its death. Dynamics of protease inhibitors on the response and the time delay model is influenced by the death rate of infected white blood cells and the failure rate of treatment.
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