Venus Landing Site Analysis

2016 ◽  
Author(s):  
Jason Rabinovitch ◽  
Kathryn Stack ◽  
Richard Otero ◽  
Gary M. Ortiz ◽  
Mark A. Bullock
Keyword(s):  
2018 ◽  
Vol 9 (3) ◽  
pp. 185
Author(s):  
Helman Nur Yusuf ◽  
Ali Suman ◽  
Thomas Hidayat ◽  
Anthony Sisco Panggabean

Lobster bambu (Panulirus versicolor) merupakan komoditas perikanan penting yang telah diekspolitasi di perairan Simeulue. Peningkatan permintaan dan pengusahaan lobster menyebabkan tekanan penangkapan terhadap populasi lobster semakin intensif dan tidak terkendali. Untuk itu  diperlukan informasi tentang biologi reproduksi dan parameter populasi lobster dalam rangka pengelolaan sumberdaya lobster yang berkelanjutan. Penelitian dilaksanakan pada Mei sampai dengan Desember 2015 diperairan Simeulue dengan tujuan untuk mengestimasi parameter populasi lobster bambu. Pengamatan dan pengukuran lobster dilakukan di tempat pengumpul lobster dengan sistem sampling acak (random sampling). Analisis data parameter populasi menggunakan software FiSAT (Stock Assessement Tools). Dari hasil penelitian diperoleh bahwa kondisi lobster bambu jantan dan betina tidak seimbang (1 : 1,5),  pola pertumbuhan bersifat alometrik negatif dengan nilai b sebesar 2,924 dan rata-rata pertama kali tertangkap (Lc) = 86 mmCL. Laju pertumbuhan (K) = 0,320 per tahun dan panjang karapas asimtotik (CL) 149,1 mm. Laju mortalitas alami (M) = 0,99 per tahun, laju kematian akibat penangkapan (F) sebesar 0,84 per tahun dan laju kematian total (Z) sebesar 1,83 per tahun. Tingkat eksploitasi (E) sebesar 0,46 atau pemanfaatan sumberdaya lobster bambu belum optimum. Penambahan baru dalam populasi berlangsung sepanjang tahun dan mencapai puncaknya pada Juni dan Juli bersamaan dengan musim timur. Untuk itu perlu adanya regulasi pemerintah dalam pengelolaan perikanan lobster yang berkelanjutan dengan menerapkan close season lobster pada puncak musim pemijahan.The painted green/bamboo lobster (Panulirus versicolor) is an important fish commodities that have been exploited in the waters of Simeulue. Increased utilization and uncontrolled exploitation of lobster causing pressure on the lobster population. For this reason, there is a need for information about the parameters of the lobster population in the management for the sustainability of lobster resource. The experiment was conducted in May to December 2015 Simeulue waters for the purpose of estimating the population parameters lobster green. Sampel collected randomly in the lobster landing site. Analysis of the data using FiSAT II software (FAO-ICLARM Stock Assessement Tools). The results obtained unbalanced condition of green lobster (1:1.5), the growth pattern is allometrically negative with value b of 2,924, length at fish first caught (Lc) = 86 mm CL. The lobster growth rate (K) = 0,320 per year and asymptotic carapace length (CL) 149.10 mm. The rate of natural mortality (M) = 0.99 per year, the mortality rate due to the arrest of (F) of 0.84 per year and total mortality rate (Z) of 1.83 per year. The rate of exploitation (E) 0,46 or green lobster resource was not optimum. Recruitment occur throughout the year with peak recruitment in June and July of the southeast monsoon. A government regulation is needed for the sustainable management of lobster resources by applying a close season during the peak spawning peri.


2020 ◽  
Vol 12 (3) ◽  
pp. 544 ◽  
Author(s):  
Vyron Antoniou ◽  
Chryssy Potsiou

This paper presents an end-to-end methodology that can be used in the disaster response process. The core element of the proposed method is a deep learning process which enables a helicopter landing site analysis through the identification of soccer fields. The method trains a deep learning autoencoder with the help of volunteered geographic information and satellite images. The process is mostly automated, it was developed to be applied in a time- and resource-constrained environment and keeps the human factor in the loop in order to control the final decisions. We show that through this process the cognitive load (CL) for an expert image analyst will be reduced by 70%, while the process will successfully identify 85.6% of the potential landing sites. We conclude that the suggested methodology can be used as part of a disaster response process.


Science ◽  
1976 ◽  
Vol 193 (4255) ◽  
pp. 804-805 ◽  
Author(s):  
BENTON C. CLARK ◽  
PRIESTLEY TOULMIN ◽  
A. K. BAIRD ◽  
KLAUS KEIL ◽  
HARRY J. ROSE

1972 ◽  
Author(s):  
R.M. Batson ◽  
K.B. Larson ◽  
V.S. Reed ◽  
R.L. Tyner
Keyword(s):  

Sign in / Sign up

Export Citation Format

Share Document