The idea of wireless power transfer (WPT) has been around since the inception of electricity. In the late 19th century, Nikola Tesla described the freedom to transfer energy between two points without the need for a physical connection to a power source as an ?all-surpassing importance to man? [1]. A truly wireless device, capable of being remotely powered, not only allows the obvious freedom of movement but also enables devices to be more compact by removing the necessity of a large battery. Applications could leverage this reduction in size and weight to increase the feasibility of concepts such as paper-thin, flexible displays [2], contact-lens-based augmented reality [3], and smart dust [4], among traditional point-to-point power transfer applications. While several methods of wireless power have been introduced since Tesla?s work, including near-field magnetic resonance and inductive coupling, laser-based optical power transmission, and far-field RF/microwave energy transmission, only RF/microwave and laser-based systems are truly long-range methods. While optical power transmission certainly has merit, its mechanisms are outside of the scope of this article and will not be discussed.

Harvesting Wireless Power: Survey of Energy-Harvester Conversion Efficiency in Far-Field, Wireless Power Transfer Systems

This article presents the history of WPT and the various technologies and applications of this exciting technology. In the near future, standardization and regulation will be of importance to realizing WPT based products for commercial applications. The WPC has defined a standard for inductive coupling and members of this group have released conforming products. There are, as yet, no standards or regulation for resonant coupling and MPT technologies. In Japan, a technical forum known as Broadband Wireless Forum has been established to discuss the future of WPT. SPS researchers have also submitted a proposal for WPT to the International Telecommunication Union (ITU). In the IEEE MTT Society, the Technical Committee MTT-26 Wireless Energy Transfer and Conversion was established in June, 2011 to discuss the future of WPT.

Power without wires

Catalytic nucleic acids, i.e. ribozymes, with new motifs giving an altered endoclease specificity, methods of screening, synthesis and expression, and uses thereof in modulating gene expression.

Nucleic acid catalysts with endonuclease activity

The Hydrolysis of RNA: From Theoretical Calculations to the Hammerhead Ribozyme-Mediated Cleavage of RNA.

Small inorganic rings in the 21st century: from fleeting intermediates to novel isolable entities.

Kinetically stabilized silaneselone [Tbt(Dip)Si=Se (4); Tbt=2,4,6-tris[bis(trimethylsilyl)methyl]phenyl, Dip=2,6-diisopropylphenyl] and silanetellone [Tbt(Dip)Si=Te] were synthesized by direct chalcogenation of Tbt(Dip)M: (M=Si, Ge) with elemental chalcogen. Deselenation of Tbt(Dip)SiSe2 also gave 4. Metallanetellones [Tbt(Dip)M=Te; M=Si, Ge] were also synthesized by the reaction of Tbt(Dip)MLi2 (M=Si, Ge) with TeCl2, which is a new synthetic method for heavy ketones.

Synthesis of Kinetically Stabilized Silaneselone and Silanetellone

Exhaustive reduction of dibromo(2,6-diisopropylphenyl){2,4,6-tris[bis(trimethylsilyl)methyl]phenyl}silane with excess amount of lithium naphthalenide (more than 4 molar amounts) in tetrahydrofuran at −78 °C gave the corresponding dilithiosilane, the effective formation of which was confirmed by the trapping experiments with a variety of electrophiles. The diaryldilithiosilane thus generated was found to be stable at −78 °C but undergo an intramolecular proton abstraction to give the lithium-migrated dilithiosilane.1

Generation and Reactions of an Overcrowded Diaryldilithiosilane

The First Stable Heteracyclopropabenzene: Synthesis and Crystal Structure of a Silacyclopropabenzene

We designed and fabricated the rectennas which use class-F load as an output filter in order to develop highly efficient rectennas at 24GHz and 60GHz. We also fabricated conventional rectennas which use a capacitor as an output filter, and compared the efficiency of class-F load rectennas with that of capacitor rectennas. We selected the diode which can produce high efficiency even at high frequency, and we parallelized the diode to improve the efficiency. The experimental result of efficiency of class-F load rectennas was 65.6%, on the other hand, that of capacitor rectennas was 52.1%.

Development of class-F load rectennas

The present invention provides nucleic acid compounds which have a non-nucleic acid structure with ring skeleton to which two functional groups are bound with fixed state and are able to point to substantially the same direction, nucleic acid compounds which can form triple strands with third nucleotide chains, nucleic acid compounds which have improved permeability, and synthetic methods thereof.

Ken Hatano

Papers

Synthesis of Kinetically Stabilized Silaneselone and Silanetellone

Generation and Reactions of an Overcrowded Diaryldilithiosilane

The First Stable Heteracyclopropabenzene: Synthesis and Crystal Structure of a Silacyclopropabenzene

Development of class-F load rectennas

Hammerhead-like nucleic acid analogues and their synthesis