Abstract: A distributed wireless sensor network includes two or more wireless nodes adapted for sensing a condition at any first node, first programming located within each node for transmitting a signal representing the sensed condition from the first node to another node, second programming located within each node for receiving the signal transmitted from any other node and for retransmitting a received signal representing the sensed condition along with additional data indicating the number of retransmissions of the signal between nodes.

Abstract: A transceiver node includes a pulse coupled oscillator in an integrated circuit, which can synchronize with other nodes to generate a global clock subsequently used to facilitate synchronous communications between individual nodes. Known potential uses include a low power sensor node radio for an ad-hoc network for military applications and medical applications such as ingestible and implantable radios, self powered radios, and medical monitoring systems such as cardiac and neural monitoring patches.

Abstract: A distributed wireless sensor network includes two or more wireless nodes adapted for sensing a condition at any first node, first programming located within each node for transmitting a signal representing the sensed condition from the first node to another node, second programming located within each node for receiving the signal transmitted from any other node and for retransmitting a received signal representing the sensed condition along with additional data indicating the number of retransmissions of the signal between nodes.

Abstract: The present invention provides a communications system, node and method of operation for forming a wireless network from independently operating nodes that have the ability to self-synchronize with each other, independently determine master and slave modes of operation to cooperate as a network, and independently vary those functions to adjust to changes in the network.

Abstract: The present invention provides a communications system, node and method of operation for forming a wireless network from independently operating nodes that have the ability to self-synchronize with each other, independently determine master and slave modes of operation to cooperate as a network, and independently vary those functions to adjust to changes in the network.

Abstract: The present invention provides a communications system, node and method of operation for forming a wireless network from independently operating nodes that have the ability to self-synchronize with each other, independently determine master and slave modes of operation to cooperate as a network, and independently vary those functions to adjust to changes in the network.

Abstract: The present invention provides a communications system, node and method of operation for forming a wireless network from independently operating nodes that have the ability to self-synchronize with each other, independently determine master and slave modes of operation to cooperate as a network, and independently vary those functions to adjust to changes in the network.

Abstract: A transceiver node includes a pulse coupled oscillator in an integrated circuit, which can synchronize with other nodes to generate a global clock subsequently used to facilitate synchronous communications between individual nodes. Known potential uses include a low power sensor node radio for an ad-hoc network for military applications and medical applications such as ingestible and implantable radios, self powered radios, and medical monitoring systems such as cardiac and neural monitoring patches.

Abstract: A method of preparing dried, concentrated ascorbate 2-polyphosphate salts is provided wherein a starting aqueous solution containing the desired 2-polyphosphate species (as well as contaminating inorganic phosphates) as sodium and potassium salts is subjected to a sequential precipitation technique to first remove the contaminants, followed by recovery of the desired species. In preferred practice, the inital starting solution is first supplemented with calcium chloride and sufficient calcium hydroxide to adjust the pH from about 6-8, thereby causing precipitation of the inorganic contaminants. At this point the ascorbate 2-polyposphate species are recovered from the supernatant and dried. The latter preferably involves washing the precipitated organophosphate salts with an aqueous organic solvent, concentration, addition of a non-solvent such as ethanol to induce precipitation, and subsequent drying.

Abstract: A catalyzed synthesis of ascorbate 2-phosphorylated compounds is provided which gives both mono-and polyphosphorylated species in excellent yield using inexpensive, readily available reactants. The method involves forming a reaction mixture of an ascorbic acid reactant such as L-ascorbic acid and a metaphosphate phosphorylating agent (e.g., sodium trimetaphosphate), and carrying out the phosphorylation reaction in the presence of a catalyzing ion selected from the group consisiting of calcium, strontium and barium ion and mixtures thereof, while maintaining the pH of the reaction mixture at a level of from about 3-12. The synthesis is characterized by very short reaction times, preferably from about 15 minutes-2 hours, and moderate temperatures on the order of 18.degree. C.-25.degree. C. Preferably, the catalyzing ion is provided by addition of calcium, strontium or barium hydroxide to the reaction mixture, this serving to also elevate the pH of the system to the desired range.