Abstract:
The present invention provides a process of producing a trifluoromethoxylated aryl or trifluoromethoxylated heteroaryl having the structure: wherein A is an aryl or heteroaryl, each with or without substitution; and R1 is —H, -(alkyl), -(alkenyl), -(alkynyl), -(aryl), -(heteroaryl), -(alkylaryl), -(alkylheteroaryl), —NH-(alkyl), —N(alkyl)2, —NH-(alkenyl), —NH-(alkynyl) —NH-(aryl), —NH-(heteroaryl), —O-(alkyl), —O-(alkenyl), —O-(alkynyl), —O-(aryl), —O-(heteroaryl); —S-(alkyl), —S-(alkenyl), —S-(alkynyl), —S-(aryl), or —S-(heteroaryl), comprising: (a) reacting a compound having the structure: with a trifluoromethylating agent in the presence of a base in a first suitable solvent under conditions to produce a compound having the structure: and (b) maintaining the compound produced in step (a) in a second suitable solvent under conditions sufficient to produce the trifluoromethoxylated aryl or trifluormethoxylated heteroaryl having the structure:
Abstract:
A frequency calibration apparatus, applied to a phase locked loop (PLL), includes a frequency detecting module and a search module. The frequency detecting module includes a first counter, a second counter and a comparing unit. During a monitoring period, the first counter and the second counter respectively generates a first count and a second count. The comparing unit compares the first count with the second count to generate a comparison result indicating at least three situations. The search module selects a frequency curve in response to the comparison result, and calibrates configuration of a voltage controlled oscillator (VCO) according to the frequency curve.
Abstract:
A wide field of view monocentric lens system for an infrared aerial reconnaissance camera includes front and rear lens shell elements and a core lens element, with the number of front and rear shell lens elements depending on the IR band of interest (LWIR, MWIR or SWIR). Infrared radiation entering the monocentric lens passes sequentially through the front shell lens element(s), the core lens element, and the rear shell lens element(s) and is focused onto a curved focal surface. The front shell lens element(s) and the rear shell lens element(s) are made of material having a relatively higher refractive index or a relatively higher optical dispersion, or both, in the band of interest, as compared to the core lens element.
Abstract:
A composite filter apparatus includes a container with a receiving space, and top and bottom openings communicated with the receiving space. A filter member includes a filter core in the receiving space, a blocking member on a top end of the filter core, and a retainer plate on a bottom end of the filter core. The receiving space is divided by the blocking member into an upper receiving space that communicates the top opening of the container, and a lower receiving space that surrounds the filter core and that communicates the bottom opening. Activated carbon particles are filled in the upper and lower receiving spaces.
Abstract:
A table is provided with a height-adjusting apparatus. The height-adjusting apparatus includes a post, an elevating unit and an operating unit. The post includes an external tube and an internal tube. The internal tube includes a lower end telescopically inserted in the external tube and an upper end for supporting the table. The elevating unit includes a threaded rod and a nut. The threaded rod is connected to the internal tube so that the threaded rod is rotatable but not rectilinearly movable relative to the internal tube. The nut is non-movably connected to the external tube. The nut is engaged with the threaded rod. The operating unit is operable to rotating the threaded rod relative to the nut to rectilinearly move the threaded rod relative to the nut. Thus, the internal tube is rectilinearly movable relative to the external tube.
Abstract:
A microwave filter has a housing defining an inner cavity. A first resonator is positioned in a first portion of the inner cavity. A second resonator is positioned in a second portion of the inner cavity. A third resonator is positioned in a third portion of the inner cavity. The first resonator and the third resonator are cross-coupled via an iris. The second resonator is elongated and is coupled to the first resonator and the third resonator. The resulting microwave filter has a frequency response having a transmission zero in the lower stopband. A high-pass filter is realized without the use of a cross-coupling probe.
Abstract:
The present invention relates to systems, compositions, and methods for the synthesis and use of imaging agents, or precursors thereof. An imaging agent precursor may be converted to an imaging agent using the methods described herein. In some cases, the imaging agent is enriched in 18F. In some cases, an imaging agent may be used to image an area of interest in a subject, including, but not limited to, the heart, cardiovascular system, cardiac vessels, brain, and other organs. In some embodiments, methods and compositions for assessing perfusion and innervation mismatch in a portion of a subject are provided.
Abstract:
A handheld apparatus is provided. The handheld apparatus includes a first touch pad, a second touch pad, an impedance unit, and a microprocessor. When an input tool touches the first touch pad and the second touch pad simultaneously, a touch voltage signal is generated on a common contact of the second touch pad and the impedance unit, wherein the resistance of the impedance unit is greater than that of the input tool. The microprocessor executes a specific function according to the touch voltage signal.
Abstract:
A portable speaker having a base, a cover, a scissors mechanism, a positioning mechanism, a restoring element, a push-push type mechanism and a speaker module is provided. The scissors mechanism, the positioning mechanism, the restoring element, the push-push type mechanism are disposed between the base and the cover, respectively. The scissors mechanism translates the cover vertically. The positioning mechanism translates the cover to an original position, a first position or a second position. The restoring element repositions the cover from the first position to the original position or the second position. The push-push type mechanism fixes the cover to the original position or the second position. The speaker module is disposed in the base or the cover, wherein the sound from the speaker module is able to be output from the interval between the base and the cover when the cover is at the second position.