In this paper, the dynamics of multicellular chopper are considered. The model is described by a continuous time three--dimensional autonomous system. Some basic dynamical properties such as Poincar'e mapping, power spectrum and chaotic behaviors are studied. Analysis results show that this system has complex dynamics with some interesting characteristics.

Cogongrass {Imperata cylindrica) is a globally recognized invasive weed; it has caused land management problems and threatened critical habitat in the southeastern United States as well as on most continents. We tested four rates of imazapyr (1.17, 2.34, 3.51 and 4.68 L/ha), the most effective active ingredient available for cogongrass control, as two formulations (Chopper and the new generatio...

The cytoplasmic juxtamembrane region of the p75 neurotrophin receptor (p75(NTR)) has been found to be necessary and sufficient to initiate neural cell death. The region was named "Chopper" to distinguish it from CD95-like death domains. A 29-amino acid peptide corresponding to the Chopper region induced caspase- and calpain-mediated death in a variety of neural and non-neural cell types and was...

In all multilevel topology with several DC link, the voltage balancing problem of DC capacitors is a key problem. This paper proposes a new topology of chopper circuit for dc capacitor voltage balancing in diode clamped multilevel inverters (DCMLI). In the presented topology the number of switches is reduced respect to other proposed topology in literatures. Suggested topology is modular and ha...

Fig. 2 shows a plot of the measured temporal waveform of the returned THz signal. The first signal (left) is the THz reflection from the metallic chopper blade once the chopper blade was set to be perpendicular to the propagation direction of the THz beam, and the second peak is the THz signal transmitted through the chopper but reflected back from the metallic mirror. Because there is a n phas...

Eric Harris Davidson was a unique and creative intellectual force who grappled with the diversity of developmental processes used by animal embryos and wrestled them into an intelligible set of principles, then spent his life translating these process elements into molecularly definable terms through the architecture of gene regulatory networks. He took speculative risks in his theoretical writ...

BACKGROUND The intracellular domain (ICD) of the neurotrophin receptor, p75NTR, exhibits variably pro- and antiapoptotic activity and has been implicated in neurodegenerative and neurodestructive disease. The molecular determinants of these cellular effects are not completely understood. The "Chopper" domain of p75ICD has been shown to be proapoptotic in in vitro systems in which p75ICD is proa...

WREN d-e signals are to be amplified, the usual approach is to use a direct-coupled circuit. The difficulty of maintaining sufficiently low drift in a direct-coupled configu ration led to the development of chopper and chopper-stabilized circuits, where a mechanical chopper reduces drift to low values. Unfortunately, other shortcomings arise, and in most applications the direct-coupled d-e ampl...

Neutron choppers at spallation-neutron facilities are rotating devices that are precisely phased to chop a neutron beam. Depending on the mass, moment-ofinertia, and velocity of rotation, a chopper can have a large amount of stored kinetic energy. For example, the PHAROS T-zero chopper at the LANSCE facility at Los Alamos National Laboratory has a rotating kinetic energy of over 1 MJ. When ener...