Judul: Aktivitas Perilaku Meghimatium bilineatum dan Deroceras laeve pada daun bawang (Allium fistulotum) di Kawasan Pertanian Agropolitan Cipanas.
Abstrak: Meghimatium bilineatum and Deroceras laeve are gastropod without shells. These animals live as pests in horticultural commodities (such as Allium fistulotum). This study aims to determine the behavioural activities of the M. bilineatum and D. laeve on Allium fistulotum in Agropolitan Agricultural Regions, Cipanas. The observed behavioural activities are their emerging, locomotion, feeding, returning to their hideout and mating. Observations were carried out from 18:00 in the twilight until 6:00 in the morning for 20 days. The results of this study indicated that the M. bilineatum’s behavioural emerging activity was peaked at 19:00, locomotion activity peaked at 19:00 and 02:00, feeding activity peaked at 23:00 pm, and returning to their hideout peaked at 03:00, while mating activity was not too often found. For D. laeve’s emerging activity, locomotion activity, feeding activity, returning to their hideout peaked at 18:00, at 18:00 and 04:00, at 22:00, and respectively, at 05.00. Meanwhile mating activity of this slug is not too obvious.
Keyword: Meghimatium bilineatum, Deroceras laeve, behavioural activity, Agropolitan Region

Judul: Kepadatan dan Persebaran Deroceras laeve dan Meghimatium bilineatum pada 10 Jenis Sayuran di Agropolitan, Cipanas
Abstrak: Deroceras laeve and Meghimatium bilineatum are slugs which are pest, that attacks the vegetables crop. The aims of this research is to study the density and distribution (pattern, feeding activity, and size) of D. laeve and M. bilineatum on 10 types of vegetables at Agropolitan, Cipanas. Sampling was conducted by quadrat method randomly. The highest density of D. laeve was 13.33 ind/m2 on Allium fistulotum and the lowest was 4 ind/m2 on Cripsum frutescens. The highest density of M. bilineatum was 6.22 ind/m2 on Solanum lycopersicum whereas the lowest was 0.56 ind/m2 on Daucus carota. Distribution Pattern of D.laeve and M. bilineatum is group. Distribution of D. laeve of small size (< 1.5 cm), medium (1.5−2.5 cm), and large (> 2.5 cm) were found in 9 different types of vegetables. Distribution of M. bilineatum of small size (< 2 cm) are rare, while the medium size (2−4 cm) and large (> 4 cm) were found in the 4 types of vegetables. Both D. laeve and M. bilineatum were prefer to eat leave than stems and tuberous root.
Keyword: Deroceras laeve, Meghimatium bilineatum, density, distribution

Judul: : Persamaan Tunggal sebagai Representasi Kurva Komposit
Abstrak: A mathematical method is introduced to represent a composite curve based on an extension of analytic geometry. The representation is given either with a single equation or with two equations, in the case of parametric representation. This method permits the representation of composite curves in similar manner to the conventional representation of non-composite curves. Some mathematical tools, including Heaviside unit step function and periodizer function, are used in the establishment of a single equation. In this paper, regular equations of regular and irregular polygon, as well as composite curves of two dimensions, are implemented using a computer algebraic system, Mathematica.
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