Abstract: Refrigerant comprising from more than 84% to less than 91% by weight of HFO-1234yf; from more than 7% to less than 15% by weight of HFO-1132(E); and from more than 1% to 2.5% by weight of CO2.

Abstract: Novel non-flammable refrigerants having a GWP of less than 750 and containing R-32, R-125, R-134a and R-1234yf, and novel air conditioning systems (including heat pumps) which use such refrigerants, and method of retrofitting standard single refrigerant vapor compression air conditioning systems using said refrigerants, including especially residential heat pumps and residential split direct expansion air conditioning systems.

Abstract: A beamformee receives a channel coefficient matrix H of a wireless communication channel between a beamformer and the beamformee. The channel coefficient matrix is a 2×N complex matrix having two rows corresponding to two antenna of the beamformee and N columns corresponding to N antenna of the beamformer. A real symmetric matrix M is determined based on the matrix H followed by determining eigenvalues and eigenvectors of matrix M. Singular vectors of the matrix H based on the eigenvectors are determined where the singular vectors define a steering matrix. The steering matrix is transmitted to a beamformer, wherein a beam is steered by the beamformer to the beamformee based on the steering matrix.

Abstract: The present invention relates to heat transfer compositions comprising refrigerant, lubricant and stabilizer, wherein the refrigerant comprises from about 5% by weight to 100% by weight of trans-1,2-difluorethylene (R1132(E)), and wherein said lubricant comprises polyol ester (POE) lubricant and/or polyvinyl ether (PVE) lubricant, and wherein said stabilizer comprises an alkylated naphthalene and optionally but preferably an acid depleting moiety.

Abstract: A wireless network includes a networking device and various stations. The networking device determines an available bandwidth of each station of the wireless network. Further, the networking device assigns a bandwidth and at least one spatial stream to each station. The bandwidth assigned to each station is less than or equal to the available bandwidth of the corresponding station. Further, the bandwidth assigned to one station is different from and partially overlaps with the bandwidth assigned to another station. Similarly, the spatial stream assigned to one station is different from the spatial stream assigned to another station. The networking device generates a data packet indicative of the bandwidth and the spatial stream assigned to each station of the wireless network, and transmits the data packet to each station to enable multi-user multiple-input-multiple-output (MU-MIMO) communication between the networking device and the stations.

Abstract: Disclosed are refrigerants comprising at least about 97% by weight of a blend of three compounds, said blend consisting of: from about 38% by weight to about 48% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 41% by weight trifluoroiodomethane (CF3I) and from about 2% by weight to about 16% by weight 2,3,3,3-tetrafluoropropene (HFO-1234yf) wherein the percentages are based on the total weight of the three compounds in the blend, and methods and systems which use same.

Abstract: Methods for improving a refrigeration systems comprising modifying the system and replacing existing refrigerant with a replacement refrigerant comprising: (1) at least about 50% by weight of R1234ze(E); (2) greater than 0% to about 11% of HFC-134a, HFC-134, HFC-227ea, HFC-125, and combinations of two or more of these; and (3) from about 4% to about 20% by weight of HFO-1336mzz(E), HFO-1224yd(Z), and combinations of these, wherein said second refrigerant: (i) has an Occupational Exposure Limit (OEL) greater than 400; (ii) is classified as class A1 by ASHRAE Standard 34; and (iii) has a GWP of about 150 or less.

Abstract: A wireless network includes a client device and an access point (AP). The client device generates a data packet having a physical layer protocol data unit frame format. The client device transmits the data packet to the AP such that a plurality of long training fields (LTFs) of the data packet is transmitted at higher power as compared to a data field of the data packet, and a preamble portion of the data packet is transmitted at higher power as compared to the plurality of LTFs. Further, the data field includes various resource units (RUs) and one such RU is utilized for data transmission between the client device and the AP. The transmission of the data packet from the client device to the AP in the aforementioned manner results in the range extension of the wireless network.

Abstract: Method for retrofitting an existing heat transfer system comprising adding to said existing system a refrigerant consisting essentially of: (i) from about 25% to about 45% by weight of 1,1,1,2-tetrafluoroethane (HFC-134a); (ii) from 25% to about 35% by weight of trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)) and/or 2,3,3,3-tetrafluoropropene (HFO-1234yf); and (iii) from about 37% to about 46% by weight of a combination of difluoromethane (HFC-32) and pentafluoroethane (HFC-125), provided that the weight ratio of HFO-32:HFC-125 is from about 1.21:1 to about 0.8:1, wherein the refrigerant preferably is a non-flammable refrigerant having a GWP of 1350 or less.

Abstract: Disclosed are refrigerants and refrigeration systems, including cascade refrigeration sysemsar comprising: a plurality of refrigeration units, each refrigeration unit containing a first refrigeration circuit, each first refrigeration circuit comprising an evaporator and a heat exchanger; and a second refrigeration circuit; wherein each first circuit heat exchanger is arranged to transfer heat energy between its respective first refrigeration circuit and the second refrigeration circuit.

Abstract: The present invention provides cascade refrigeration systems in which the low stage comprises a refrigerant with a GWP less than 150, and the high stage comprises a refrigerant that is either Class A1 or Class A2L and comprises at least about 75% by weight of HFO-1234ze(E).

Abstract: Disclosed are methods for providing heating and/or cooling of the type comprising evaporating refrigerant liquid and condensing refrigerant vapor in a plurality of repeating cycles, where the method comprises (a) providing the refrigerant comprising at least about 5% by weight of a lower alkyl iodofluorocarbon; and (b) exposing at least a portion of said refrigerant in at least a portion of said plurality of said cycles to a sequestration material comprising: i) copper or a copper alloy; ii) a molecular sieve (preferably a zeolite), comprising copper, silver, lead or a combination thereof; iii) an anion exchange resin, and iv) a combination of two or more of these, wherein said exposing temperature is preferably above about 20 C.

Abstract: The present invention provides a refrigerant composition comprising: (a) from about 65% by weight to about 90% by weight of HFO-1234ze (E); (b) from about 10% by weight to about 35% by weight of HFO-1336mzz (E); and optionally (c) from about 0% to about 4.4% by weight of HFC-227ea for use in a variety of refrigeration applications, including air conditioning and/or refrigeration and particularly cooling products such as fruits, vegetables and beverages without exposing those articles to temperatures below the freezing point of water.

Abstract: Methods for forming an improved, centralized refrigeration systems comprising: (a) providing an existing refrigeration circuit with an existing high GWP refrigerant; (b) disconnecting the fluid connection between the existing liquid refrigerant from the condenser and the evaporators; (c) disconnecting the fluid connection between the existing refrigerant vapor from the evaporators and the compressor suction; (d) establishing a new first refrigeration circuit comprising the compressor and the condenser; (e) establishing a new second refrigeration circuit comprising the evaporators by removing existing refrigerant from the evaporators and the disconnected conduits and replacing the removed refrigerant with a second refrigerant comprising at least 50% of R1234ze(E) and being Class A1 and having an OEL greater than 400 and a GWP of about 150 or less; and thermally interconnecting the new first refrigeration circuit and the new second refrigeration circuit with an inter-circuit heat exchanger.

Abstract: A wireless communication device includes first and second links. The first and second links respectively include first and second sets of antennae having an arrangement that renders a null space of a channel matrix between the first and second links non-zero. When the first and second links operate on a first frequency band, the first link obtains first channel state information that indicates a first channel measurement of a first set of channels observed from the second link to the first link. Based on the first channel state information, the first link determines a spatial mapping matrix that facilitates null steering of a signal transmission from the first link in a direction of the second link. The first link transmits to a remote device, a wireless signal on the first frequency band based on the spatial mapping matrix.

Abstract: A WLAN AP includes an array of antennas, a transceiver and a processor. The transceiver is configured to transmit via the array of antennas downlink packets to WLAN STAs, and to receive uplink packets from the STAs. The processor is coupled to the transceiver and is configured to send a request to a plurality of the STAs to transmit a respective plurality of channel-sounding packets corresponding to the plurality of STAs, to receive the plurality of channel-sounding packets from the plurality of STAs in response to the request, to compute, based on the received plurality of channel-sounding packets, a beamforming matrix that defines subsequent transmission beams aimed toward at least a subset of the plurality of STAs, and to transmit one or more downlink data packets to one or more of the STAs via the array of antennas, in accordance with the beamforming matrix.

Abstract: The present invention relates to heat transfer compositions comprising refrigerant, lubricant and stabilizer, wherein the refrigerant comprises from about 5% by weight to 100% by weight of trifluoroiodomethane (CF3I), and wherein said lubricant comprises polyol ester (POE) lubricant and/or polyvinyl ether (PVE) lubricant, and wherein said stabilizer comprises an alkylated naphthalene and optionally but preferably an acid depleting moiety.

Abstract: A wireless network includes a networking device and various stations. The networking device determines an available bandwidth of each station of the wireless network. Further, the networking device assigns a bandwidth and at least one spatial stream to each station. The bandwidth assigned to each station is less than or equal to the available bandwidth of the corresponding station. Further, the bandwidth assigned to one station is different from and partially overlaps with the bandwidth assigned to another station. Similarly, the spatial stream assigned to one station is different from the spatial stream assigned to another station. The networking device generates a data packet indicative of the bandwidth and the spatial stream assigned to each station of the wireless network, and transmits the data packet to each station to enable multi-user multiple-input-multiple-output (MU-MIMO) communication between the networking device and the stations.

Abstract: The present invention relates to a refrigerant composition comprising 75-80% by weight of HFO-1234ze(E), 6% to not greater than 12% by weight of HFC-134a and from 11% to about 17% by weight of HFO1336mzz(E), and to the use of the refrigerant in a heat exchange systems, including electronic cooling, low and medium temperature refrigeration and to the use of such compositions as a replacement of the refrigerant R-410A for heating and cooling applications.

Abstract: The present invention relates to a refrigerant composition comprising at least about 98.5% by weight of the following three compounds, with each compound being present in the following relative percentages: 33.0% to 45% by weight difluoromethane (HFC-32); 48.5% to 67.0% by weight of 2,3,3,3-tetrafluoropropene (HFO-1234yf); and 1.0% to 6.0% by weight fluoroethane (HFC-161), and to the use of the refrigerant in a heat exchange system, including air conditioning, refrigeration applications and heat pump applications and to the use of such compositions as a replacement of the refrigerant R-410A or R-32 or R-454B for heating and cooling applications.