Effects of External Loads on Human Head Movement Control Systems

The central and reflexive control strategies underlying movements were elucidated by studying the effects of external loads on human head movement control systems. Some experimental results are presented on dynamic changes weigh the addition of aviation helmet (SPH4) and lead weights (6 kg). Intended time-optimal movements, their dynamics and electromyographic activity of neck muscles in normal movements, and also in movements made with external weights applied to the head were measured. It was observed that, when the external loads were added, the subject went through complex adapting processes and the head movement trajectory and its derivatives reached steady conditions only after transient adapting period. The steady adapted state was reached after 15 to 20 seconds (i.e., 5 to 6 movements)

On the number of electrons that a nucleus can bind

We review some results on the ionization conjecture, which says that a neutral atom can bind at most one or two extra electrons.Comment: Contribution to the Proceedings of ICMP12, Aalborg, Denmark, August 6--11, 201

Community-based fish culture in seasonal floodplains

During the rainy season in extensive river floodplains and deltaic lowlands, floods render the land unavailable for crop production for several months each year. These waters are considerably underutilized in terms of managed aquatic productivity. This raises the opportunity to enclose parts of these floodwater areas to produce a crop of specifically stocked aquatic organisms aside from the naturally occurring ‘wild’ species that are traditionally fished and are not affected by the culture activity, resulting in more high-quality, nutrient-dense food production and enhanced farm income for all stakeholders, notably the poor. The WorldFish Center and its national partners recently tested the concurrent rice-fish culture in the shallower flooded areas and the alternating rice-fish culture in the deep-flooded areas of Bangladesh and Viet Nam through a community-based management system. Results indicate that community-based fish culture in rice fields can increase fish production by about 600 kg/ha/year in shallow flooded areas and up to 1.5 t/ha/year in deep-flooded areas, without a reduction in the rice yield or wild fish catch

Network Simulator dan Network Animator Menggunakan Cygnus Windows dalam Windows XP

Ada beberapa keuntungan menggunakan NS sebagai perangkat lunak simulasi pembantu analisisdalam riset, NS dilengkapi dengan tool validasi. Tool validasi digunakan untuk menguji validitaspemodelan yang ada pada NS. Secara default, semua pemodelan pada ns akan dapat melewati prosesvalidasi ini. Jika ingin melakukan validasi terhadap pemodelan protocol yang ada pada library ns, dapatdilakukan dengan mengetikkan ./validate pada console saat pada direktori ns2.Network Simulator (NS) mensimulasikan jaringan berbasis TCP/IP dengan berbagai medianya. Dapatmensimulasikan protokol jaringan (TCPs/UDP/RTP), Trafic behaviour (FTP, Telnet, CBR, dan lain-lain),Queque management (RED, FIFO, CBQ) algoritma routing unicast (Distance Vector, Link State) danmulticast, (PIM SM, PIM DM, DVMRP, Shared Tree dan Bi Directional Shared Tree), aplikasi multimediayang berupa layered video, Quality of service video-audio dan transcoding. Ns juga mengimplementasikanbeberapa MAC (IEEE 802.3, 802.11), di berbagai media, misalnya jaringan wired (LAN, WAN, point topoint), wireless (seperti mobile IP, Wireless LAN), bahkan simulasi hubungan antar node jaringan yangmenggunakan media satelit