摘要:
The present invention is based on a two-dimensional photonic crystal in which are inserted four waveguides and one resonant cavity. Due to the existence of the photonic band gap, an electromagnetic signal that flows through the device is confined to the interior of the cavity and waveguides and, by adjusting the orientation of a dipole mode excited in the resonator, it can operate in three distinct regimes. In regime 1, subjected to an external DC magnetic field + H 0 , it operates as a two-way divider, with isolation of the input from the two outputs, and, by inverting the sign of the DC magnetic field, as an optical switch. In regime 2, with the application of a DC magnetic field -Ho, it operates as a waveguide bending element, with isolation of input from output, and, by inverting the sign of the DC magnetic field, as an optical switch. In regime 3, subjected to the application of an external DC magnetic field + H 1 , the device operates as a three-way divider.
摘要:
The present invention refers to the use of HMP (a secondary metabolite obtained from Aspergillus fungi) as an agent that intensifies the mechanism of macrophage activation, leading to the death of L. (Leishmania) amazonensis, the etiologic agent of cutaneous leishmaniasis. The main mechanism of action of this agent is the activation of the microbicidal activity of host cells, through increased superoxide production, number of lysosomes, actin and microtubule filament polymerization and increased spreading, typical of activated cells. Additionally, HMP represents a molecule of easy acquisition, presents an efficient combat mechanism with no adverse reactions and capacity to inhibit the development of promastigotes and amastigotes forms. Finally, results suggest HMP to be a potential candidate for use against cutaneous leishmaniasis at a minimal concentration of 50 μg/mL.
摘要:
The present invention is based on a two-dimensional photonic crystal composed of a square lattice of dielectric rods immersed in air, in which are inserted, in a controlled manner, defects that originate three waveguides and one resonant cavity. The cavity is composed of a ferrite cylinder with magneto-optical properties, and by two dielectric cylinders located near to the ferrite cylinder. It has the function of transmitting electromagnetic signals in a desired direction (clockwise or counterclockwise), defined by the sign of an external DC magnetic field H 0 .
摘要:
The present invention refers to the use of HMP (a secondary metabolite obtained from Aspergillus fungi) as an agent that intensifies the mechanism of macrophage activation, leading to the death of L. (Leishmania) amazonensis, the etiologic agent of cutaneous leishmaniasis. The main mechanism of action of this agent is the activation of the microbicidal activity of host cells, through increased superoxide production, number of lysosomes, actin and microtubule filament polymerization and increased spreading, typical of activated cells. Additionally, HMP represents a molecule of easy acquisition, presents an efficient combat mechanism with no adverse reactions and capacity to inhibit the development of promastigotes and amastigotes forms. Finally, results suggest HMP to be a potential candidate for use against cutaneous leishmaniasis at a minimal concentration of 50 μg/mL.
摘要:
A new and low cost method for producing single wall nanotubes and other allotropic forms of carbon. The method uses a high electric current and 127 VAC or 220 VAC power supplies to sublimation of a solid precursor, which material can be made of graphite. The solid precursor is connected to metallic electrodes, so that an intense electric current cross the contacts to pulverize the graphite under high temperature. The carbon materials are deposited in the wall of the reactor as well as in the electrodes, in an atmospheric pressure. The obtained material is purified in acids and, then, the carbon nanotubes are separated. In general, the synthesis is characterized by the absence of a metal catalyst, the employ of a short circuit current with an agent to produce carbon materials, the low pressure into reaction, and the assembly of the apparatus involving a low voltage of operation.
摘要:
The invention concerns a method for generating a pulsed magnetic field, the method being implemented using a device (10) comprising an electrical supply (20), a switch (25), a capacitor (15) and a coil (30) having a first extremity (80) connected to an electrical ground and a second extremity (85), the capacitor (15) comprising a first electrode connected to the electrical ground and a second electrode, the switch (25) being able to commute between a first configuration wherein the second electrode and the second extremity (85) are electrically insulated and at least one second configuration wherein the second electrode and the second extremity (85) are electrically connected, the capacitor (15), the switch (25) and the coil (30) forming a series circuit when the switch (25) is in the second configuration, the series circuit being underdamped.
摘要:
The present invention is based on a two-dimensional photonic crystal in which are inserted three waveguides and one resonant cavity by the creation of linear and local defects. Due to the photonic band gap related to the photonic crystal, electromagnetic signals are confined to the interior of waveguides and resonant cavity. By exciting dipole modes in the resonant cavity, with orientation that depends on the intensity of the applied DC magnetic field, the present circulator can provide the nonreciprocal transmission of signals in the clockwise and counterclockwise directions. It can fulfill the isolation function and it is fork-shaped, providing greater flexibility in the design of integrated optical communication systems.
摘要:
Patent of a process that consists of a coupling a fixing split clamp to the torch (2) in a injecting device of two "cold" wires a to a welding torch (14) that is connected to the electrode wire head (12), which is also connected to the welding power source (11) that establishes the electric arc and the weld pool, the two "cold" wires are boosted by auxiliary heads (13), lead through the conduit (17) until the injector tube (8), which is fastened to the injector tube basis (7) by brake bolts (10) and therefore the injector tube (8) may dislocate horizontally to the welding torch, also enabling the injector tube (8) to make a turn perpendicular to the welding torch, these two movements determine the input angle of the "cold" wires in relation to the electrode wire (torch wire) and between the two "cold" wires. The "cold" wires pass through the contact nozzles (9) which are made of electrolytic copper and they have the function of leading "cold" wires as close as possible to the electric arc to prevent vibrations and disturbance in the wire.