Optical beaming of electrical discharges

Igniting and guiding electrical discharges to desired targets in the ambient atmosphere have been a subject of intense research efforts for decades. Ability to control discharge and its propagation can pave the way to a broad range of applications from nanofabrication and plasma medicine to monitoring of atmospheric pollution and, ultimately, taming lightning strikes. Numerous experiments utilizing powerful pulsed lasers with peak-intensity above air photoionization and photo-dissociation have demonstrated excitation and confinement of plasma tracks in the wakes of laser field. Here, we propose and demonstrate an efficient approach for triggering, trapping and guiding electrical discharges in air. It is based on the use of a low-power continuous-wave vortex beam that traps and transports light-absorbing particles in mid-air. We demonstrate a 30% decrease in discharge threshold mediated by optically trapped graphene microparticles with the use of a laser beam of a few hundred milliwatts of power. Our demonstration may pave the way to guiding electrical discharges along arbitrary paths.

Design of a Facility for Tsunami Run up Generation to Study Tsunami and Seawall Interaction

Experimental researches on the tsunami in the laboratory have been conducted using various methods. The use and techniques of tsunami wave generator depend on the objective of the tsunami observation to be conducted. When the objective is the scouring at the downstream of a seawall, the use of a short flume with control discharge seems to be appropriate. A valve with a mechanic controller was equipped to control the discharge from a reservoir into the flume. A numerical simulation of discharge into the flume and the overflow above the seawall was conducted to determine the dimension of the tsunami flume and its generator before construction. The experiments were conducted to simulate the hydrograph of tsunami overflow above the seawall model. The numerical hydrograph is found to be comparable with the experimental hydrograph. This indicates that the tsunami wave generator is capable of simulating tsunami hydrograph and ready for further use of simulations.

The Study about Breakdown between the Electrodes Gap Law in WEDM

For the question of difficult to control discharge process between the electrodes in WEDM, Systematic analysis of the relationship breakdown and the distance between poles、the relationship of the breakdown voltage and pulse duration、the relationship breakdown and impurity、the relationship breakdown and the temperature、Summed up the WEDM in the general laws of the electrode gap breakdown、So as to better control of WEDM process in the very room provides a theoretical basis for discharge.

Embedded UPS Remote Control Management System Based on ARM

Design an Embedded UPS Remote Control and Management System with S3C2440. Remote control discharge, field manual discharge, regular maintenance for discharge operation, remote and manual power recovery operation can be realized through INTRANET LAN and field terminal. Further more, overdischarging protection, power abnormal protection, fault alarm, field data collection and upload are also achieved, which makes the system widely applied in the field of bank and hospital.

Effects of inhaled CO2 on airway stretch receptors in the newborn dog

The response of 96 slowly adapting airway stretch receptors (SARs) to inhaled CO2 was studied in 26 puppies, which were anesthetized, paralyzed, and passively ventilated with the chest open. Both inhibitory and excitatory influences were obtained during CO2 inhalation depending on the presence or absence of a partially intact parasympathetic innervation and the receptor location. In puppies in the vagotomized condition, tracheal SARs of the youngest puppies (1–10 days) were inhibited (68% of control discharge), whereas bronchial SARs were unaffected by CO2. In the older age groups (12–17 and 26–30 days) there was a gradual acquisition of the adult response with a progressive increase in the inhibitory action of CO2 on bronchial SARs, whereas tracheal SARs became less affected. An excitatory action of CO2 could be found if the contralateral vagus nerve was intact. This response, which was abolished by vagotomy or atropine, was limited to tracheal SARs (occurring in 8 out of 23 receptors with the remainder inhibited) and was not accompanied by changes in transpulmonary pressure. Considering that only one-half of the functional efferent innervation of the trachea was present (i.e., left vagus only) and that the response has never been reported in the adult, the stimulation of SAR activity via smooth muscle contraction may represent a mechanism that could severely limit the neonate's ability to respond to periods of apnea or asphyxia.