POPULASI KUMBANG TANDUK (Oryctes rhinoceros L.) PADA KEBUN KELAPA SAWIT PEREMAJAAN SISTEM SISIPAN DAN TUMBANG SEREMPAK DI KECAMATAN BAHAR UTARA KABUPATEN MUARO JAMBI

It is necessary to carry out replanting activities to increase the production and productivity of oil palm plants. Rejuvenation of oil palm plantations can be done through an inserting system and totally rejuvenation system. The population propagation of horn beetles growed faster in oil palm plantations with inserting rejuvenation system than in totally rejuvenation system. This study aimed to obtain an accurate information on the population of horn beetles in oil palm plantations. The research has been conducted on July-August 2020 in Talang Bukit Village as an inserting system area Talang Datar Village as a totally rejuvenation area, Bahar Utara District, Muaro Jambi Regency, Jambi Province. An unformated trial was carried out as an experimental design and the location determination was purposively chosen for there were plants under study and showed a uniform condition at that location. the sampling locations based on oil palm plantation rejuvenation systems, namely: (1) inserting rejuvenation system, and (2) totally rejuvenation system. There were 15 / Ha population at oil palm plantation with inserting rejuvenation system, while there were 3 horn beetles/Ha in totally rejuvenation system. The percentage of horn beetle attacking was 22,22 in inserting rejuvenation system while it was only 3.70%. in the totally rejuvenation system.Key words: population, horn beetle, rejuvenation, oil palm

Research on Off-Grid Photovoltaic System Under Non-Linear Condition Using Solar GIS Tool

This paper proposes a novel method for the analysis of photovoltaic system under unreliable condition. The photovoltaic system is the combination of large number of PV cells connected in series. The photovoltaic system plays a great role in reducing the global warming and maintaining the ecological balance by promoting to the green environment. The photovoltaic system replaces the conventional method of generating electricity to the non-conventional method of generating electricity. This paper focus on distinguishing the performance of photovoltaic system under uniform condition and non-uniform unreliable condition through the solar GIS tool.

Interpretation of MPPT Techniques in Grid Connected Solar PV Array System

Solar energy is one of the most used and readily available renewable energy sources among the other energy sources. The power generated by PV systems is dependent on solar irradiance and temperature parameters. In the literature, many researchers and studies are interested in estimating true maximum efficiency point for the PV systems. Due to that fact, MPPT applications and techniques become an important issue for PV systems under both uniform and non uniform conditions. Although, PV system under uniform environment has only one maxima point on P-V curve which is simple to estimate correctly by conventional MPPT techniques, it is not as simple as under non-uniform condition such as partial shading and mismatch effects. To overcome the drawbacks of the conventional MPPTs under non uniform condition, researchers has been investigated new soft computing MPPTs, PV array configurations, system architectures and topologies.

Class-Uniformly Resolvable Group Divisible Structures II: Frames.

We consider Class-Uniformly Resolvable frames (CURFs), which are group divisible designs with partial resolution classes subject to the class-uniform condition. We derive the necessary conditions, including extremal bounds, build the foundation for general CURF constructions, including a frame variant of the $\lambda$ blow-up construction from part I. We also establish a PBD-closure result. For CURFs with blocks of size two and three we determine the existence of CURFs of type $g^u$, completely for $g=3$, with a small list of exceptions for $g=6$, asymptotically for $g=4,5$ and give some other infinite families.