The research aims to know the life cycle, feeding and mating behavior of predatory beetle S. gilvifrons, and was conducted at entomology laboratory of Assessment Institute for agricultural technology Malang -East Java. The treatments involved feeding behavior and capacity of the various instars and imago of S. gilvifrons. The number of mites consumed within 24 hours by each stage of beetle was also recorded. The average voracity of five individual predators for each instar was determined. The result showed that average life cycle of S. gilvifrons feed on E. orientalis was 4.11 + 0.78; 8 + 1.10; 3.83 + 0.41, respectively for egg, larva and pupa. The predator caught the preys from the front side, then chewed and sucked the body contents of adult preys or consumed the whole egg. The feeding capacity was greater in egglaying than that in non egg-laying females and males. The smallest size of the cage (1.5 cm diameter x 5 cm long) and clear weather were the most preferred situation for S. gilvifrons mating, which usually occurs on the upper leaf surface. The male positioned itself over the female body and extended its aedeagus to reach the female.
Coolant is one of the factors that affects the quality of the workpiece. The selection of coolant is useful to lower the surface roughness of the workpiece. In addition, coolant should be easily degradable in the environment so that the environment is not polluted. Example coconut oil is an oil that can be degraded in the environment. This research is aimed to observe the influence of coconut oil for cooling to the surface roughness obtained during face milling process. In the experimental tests, conventional milling machine was used and the milling tests were performed under various machining parameters, namely spindle rotational speed was 360 and 490 rpm, feeding speed was 60 mm/min and 70mm/min. Based on the result, the surface for spindle rotational speed of 360 rpm and feeding speed 60 mm/min was more rough than one in spindle rotational speed of 360 rpm and feeding speed 70 mm/min. Besides, the surface roughness for spindle rotational speed of 490 rpm and feeding speed of 60 mm/min was also more rough than one in spindle 490 rpm and 70 mm/min.
This research aims to know the influence of export, import and population against Indonesia gross domestic product. The data used in this research is secondary data from the years 1969-2016 were sourced from a variety of reports and the compilation of the particular publication of the World Bank. The model used was multiple linear regression analysis method using the approach of Generalized Least Square parameter estimation (GLS). The results of calculations indicate that the variable is positive and significant effect of exports to GDP, population of Indonesia a negative and significant effect against Indonesia'S GDP, while imports of influential positive and insignificant to GDP Indonesian. The value of the coefficient of determination (R2 = 0.9464 adj.)show that Indonesia'S GDP amounted to 94.64 percent affected by the Export, import and Population, while the remaining 5.36 percent affected by factors other than this research.Keywords : Import, Export, Population, Gross Domestic Product, Generalized Least SquareAbstrakPenelitian ini bertujuan untuk mengetahui pengaruh ekspor, impor dan jumlah penduduk terhadap produk domestik bruto Indonesia. Data yang digunakan dalam penelitian ini adalah data sekunder dari tahun 1969-2016 yang bersumber dari berbagai laporan dan kompilasi khususnya publikasidari World Bank. Model yang digunakan adalah regresi linear berganda dengan metode analisis menggunakan pendekatan estimasi parameter Generalized Least Square (GLS). Hasil perhitungan menunjukkan bahwa variabel ekspor berpengaruh positif dan signifikan terhadap PDB Indonesia, jumlah penduduk berpengaruh negatif dan signifikan terhadap PDB Indonesia, sedangkan imporberpengaruh positif dan tidak signifikan terhadap PDB Indonesia. Nilai koefisien determinasi (Adj.R2= 0.9464) Menunjukkan bahwa PDB Indonesia sebesar 94,64 persen dipengaruhi oleh Ekspor, Impor dan Jumlah Penduduk, sedangkan sisanya 5,36 persen dipengaruhi oleh faktor-faktor lain diluar penelitian ini.Kata Kunci : Impor, Ekspor, Jumlah Penduduk, Produk Domestik Bruto, Generalized Least Square
The research objective was to quantify the development and survivorship rate of S. dorsalis in different phenological stages of mango and selected weeds. The research was conducted in the laboratory of PT. Trigatra Rajasa, Mango plantation in Ketowan, Arjasa, Situbondo, East Java, Indonesia from February to September 2015. The development and survivorship rate were done through observation of life span of S. dorsalis from egg to pupa. Analysis of Variance and Duncan Multiple Range Test (p = 0.05) with 5 replications were applied to ensure the significant differences among the treatments. The result showed that development and survivorship of Scirtothrips dorsalis were supported by mango flushes and flower as well as some weeds such as Leucania leucochepala, Ipomoea triloba, Achalypha indica, Desmanthus leptophyllus and Azadirachta indica as source of food. Achalypha indica was the most suitable host with development time (12.82 ± 0.21 days) and survivorship (33 %). Weed Tridax procumbent, Momordica charantia and Mimosa pudica were unable to provide the living requirement for immature developmental stage of S. dorsalis.
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