Polarization sensitivity (PS) is a common feature of invertebrate visual systems. In insects, PS is well known for its use in several different visually guided behaviours, particularly navigation and habitat search. Adult dragonflies use the polarization of light to find water but a role for PS in aquatic dragonfly larvae, a stage that inhabits a very different photic environment to the adults,...

The intracellular response of the ocellar nerve dendrite, the second order neuron in the retina of the dragonfly ocellus, has been modified by application of various drugs and a model developed to explain certain features of that response. Curare blocked the response completely. Both picrotoxin and bicuculline eliminated the "off" overshoot. Bicuculline also decreased the size of response and t...

All natural flyers equip flexible wings. It’s widely thought that the wing flexibility can play important roles in flight aerodynamics. In the current work, a combined experimental and computational method is developed to study the role of morphing wing in hovering dragonfly aerodynamic performance. We start with taking high-speed images of a freely flying dragonfly. Next, a surface reconstruct...

In larval damselflies, the self-amputation (autotomy) of the caudal lamellae permits escape from predatory larval dragonflies. Lamellar joint size declines among populations with increasing risk of dragonfly predation, but the breaking force required for autotomy and the biomechanical factors that influence breaking force are unknown. If autotomy enhances survival in larval damselflies, then pr...

Several reports suggested that rice seedling nursery-box application of some systemic insecticides (neonicotinoids and fipronil) is the cause of the decline in dragonfly species noted since the 1990s in Japan. We conducted paddy mesocosm experiments to investigate the effect of the systemic insecticides clothianidin, fipronil and chlorantraniliprole on rice paddy field biological communities. C...

Dragonflies are bioindicator insects for the quality of aquatic environment, especially springs. This study aims to determine types dragonflies that live in Science Techno Park (STP) spring, Beleknehe village, Nekemese sub-district, Kupang District. STP is owned by Widya Mandiri Catholic University. research was conducted September 2022. Data collection consisted dragonfly samples and abiotic f...

Abstract The machining performance, such as carbon emission, dilution ratio rate, and powder utilization can be improved by selecting appropriate process parameters in laser cladding. However, the importance evaluation of performance users is often fuzzy. How to make a reasonable decision about cladding under this condition? To resolve problem, multi-objective fuzzy decision-making approach pro...

Cloud computing offers flexible, interactive, and observable access to shared resources on the Internet. It frees users from requirements of managing their hardware. enables not only store data over internet but also can it whenever wherever is required. The frequent use smart devices has helped cloud realize need for its rapid growth. As more are adapting environment, focus been placed load ba...