Judul: Model spasial pendugaan dan pemetaan biomassa di atas permukaan tanah menggunakan citra ALOS PALSAR resolusi 12.5 m
Abstrak: Teknologi penginderaan jauh merupakan salah satu teknologi untuk mengetahui seberapa besar kandungan biomassa dalam hutan. Citra ALOS PALSAR memiliki keunggulan dapat menembus lapisan awan tebal. Penelitian ini bertujuan untuk membangun model penduga biomassa pada areal revegetasi pertambangan batubara PT Bukit Asam menggunakan Citra ALOS PALSAR resolusi spasial 12.5 m dan memetakan sebaran biomassanya. Biomassa di lapangan diduga dengan menggunakan metode alometrik Chave (2005) dan Ketterings (2001). Model penduga biomassa disusun menggunakan analisis regresi antara nilai-nilai biomassa di lapangan dengan nilai-nilai backscatter polarisasi HH dan HV dari citra ALOS PALSAR. Kriteria yang digunakan dalam pemilihan model terbaik didasarkan pada kriteria R2adj paling tinggi dan Root Mean Square Error paling rendah. Verifikasi model terpilih dilakukan dengan menggunakan uji t-berpasangan, kemudian dilakukan pemetaan biomassa berdasarkan hasil model terverifikasi. Dari analisis model yang dicobakan untuk menduga biomassa diperoleh hasil Y= EXP (16.724 + (0.387 x BS_HV)), dengan nilai R2adj 87.9%, RMSE 24.19, Overall Accuracy 58.93% dan Kappa Accuracy 19.5%.
Keyword: Bogor Agricultural University, Institut Pertanian Bogor, IPB, Biomass, Backscatter

Judul: Model Spasial Pendugaan dan Pemetaan Biomassa di Atas Permukaan Tanah Menggunakan Citra ALOS PALSAR Resolusi 12.5 M.
Abstrak: Remote Sensing Technology is one of the technology to estimate biomass in the forest. ALOS PALSAR image has a capability to penetrate the thick cloud layer. The aim of this research was to create biomass estimation model in coal mining areas of revegetation PT. Bukit Asam using 12.5 m resolution of ALOS PALSAR image and mapped the distribution of biomass. Field biomass was estimated using allometric Chave (2005) and Ketterings (2001). The biomass estimation models were developed using regression analysis by relating the field biomass values and the backscatter values of HH and HV polarizations of the ALOS PALSAR image. Selection of the best model based on parameters maximum R2adj, Root Mean Square Error as the least. The verification of selected model done by using t-paired test, then the biomass mapping based on models that have been verified. Based on model analysis to estimate biomass obtained results Y = EXP (16.724 + (0.387 x BS_HV)), with value of R2adj 87.9%, RMSE 24.19, Overall Accuracy 58.93% and Kappa Accuracy 19.5%.
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Judul: The Effects of Hypothyroidism in the Fertility of Male Rats
Abstrak: Thyroid hormones are involved in the development and maintenance of virtually all tissues. The purpose of the study is to understand effects of the neonatal hypothyroidism in the fertility of male rats. Recent studies with juvenile rats indicate that changes in thyroid function early in life have a major impact on the endocrine and/or paracrine factors regulating testicular growth and function. However, one should keep in mind that hypothyroidism is a complex hormonal dysfunction rather than a single hormonal defect. Hypothyroidism has been also shown to reduce the secretion of GnRH (gonadotropins releasing hormone), LH (Luteinizing Hormone), FSH (Follicle Stimulating Hormone), GH (Growth Hormone) and testicular testosterone in rats. Therefore, many of the testicular changes observed in prolonged hypothyroidism could result in some degree of diminished levels of the aforementioned hormones. The transient neonatal hypothyroidism model results in the unnatural testicular development and in sperm production in neonates hence resulting in decreased fertility upon puberty.
Keyword: Hypothyroidism, Neonates, Testicular Growth, Fertility