Abstract: Provided is a dual-mode compressor. The dual-mode compressor includes a first scroll plate (31), a second scroll plate (32), and an impeller (33). The first scroll plate (31) and the second scroll plate (32) define a scroll compression working cavity (3a), and the impeller (33) defines a centrifugal compression flow channel (33d). The impeller (33) and the second scroll plate (32) are fixed relative to each other and are arranged coaxially, and the inlet of the centrifugal compression flow channels (33d) is communicated with the outlet of the scroll compression working cavity (3a).

Abstract: This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer-readable media, for wireless range extension for communication in a wireless local area network (WLAN). In some aspects, a first WLAN device and a second WLAN device may exchange one or more management frames advertising support for a non-orthogonal frequency-division multiplexing (non-OFDM) data rate for communications via one or more non-2.4 GHz bands. In some aspects, the non-OFDM data rate may be a data rate of a plurality of data rates associated with an IEEE 802.11b standard, and the one or more non-2.4 GHz bands may include one or more of a 3.5 GHz band, a 5 GHz band, a 6 GHz band, a 45 GHz band, and a 60 GHz band. The first and second WLAN devices may select the non-OFDM data rate and at least one of the non-2.4 GHz bands for exchange data communications.

Abstract: A heat exchanger is provided, including a heat exchanger core. The heat exchanger core at least includes a first core part, a second core part and a third core part which are stacked. The first core part, the second core part and the third core part are formed by stacking plates. The third core part is located between the first core part and the second core part. The first core part is in the form of unilateral flow. The second core part is in the form of diagonal flow. The third core part can realize transformation of flow channel forms of the first core part and the second core part, and is stacked with the first core part and the second core part, and thus the heat exchange efficiency is good.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a transmitter may detect at least one distance between the transmitter and a receiver. The transmitter may transmit, to the receiver, information using a selected band of a wide band or a narrow band, where the selected band is based at least in part on the at least one distance. Similarly, in some aspects, a receiver may detect at least one distance between the receiver and a transmitter. The receiver may receive, from the transmitter, information using a selected band of a wide band or a narrow band, where the selected band is based at least in part on the at least one distance. Numerous other aspects are described.

Abstract: A heat exchanger is provided, including a heat exchanger core. The heat exchanger core at least includes a first core part, a second core part and a third core part which are stacked. The first core part, the second core part and the third core part are formed by stacking plates. The third core part is located between the first core part and the second core part. The first core part is in the form of unilateral flow. The second core part is in the form of diagonal flow. The third core part can realize transformation of flow channel forms of the first core part and the second core part, and is stacked with the first core part and the second core part, and thus the heat exchange efficiency is good.

Abstract: A centrifugal compressor includes an asymmetric self-recirculating casing treatment that includes, on an inner face of a casing 10, a suction ring groove 1, a ring guide channel 2 and a back-flow ring groove 3 to form a self-recirculating channel. An axial distance Sr from an upstream end face of the suction ring groove 1 to an impeller full blade leading edge 4 or a width br of the suction ring groove 1 is represented as A·sin(?+?0)+A0 and is distributed in a sinusoidal shape in a circumferential direction, an initial phase angle ?0 is in a range of 0°??0?360°, and a circumferential angle ? of the casing 10 has a definition range of ?0????0+360°. In the expression, A denotes amplitude of distribution of the axial distance Sr or the width br, and A0 denotes an average of the axial distance Sr or the width br.

Abstract: A centrifugal compressor has a casing 7. In the casing 7 is formed a back-flow channel 9 to return fluid from a downstream position of an impeller full blade leading edge 6a to an upstream position of the impeller full blade leading edge 6a. The back-flow channel 9 includes a suction ring groove 9a and a back-flow ring groove 9b. The suction ring groove opens at the downstream position on the inner face 7a of the casing 7, and extends in the circumferential direction. The back-flow ring groove opens at the upstream position on the inner face 7a, and extends in the circumferential direction. Distribution in the circumferential direction of the axial-direction position of the suction ring groove 9a or a width of the suction ring groove 9a is asymmetric with reference to the rotation axis.

Abstract: A centrifugal compressor includes: a volute casing including a first casing and a second casing that are mutually coupled, the first casing including a volute chamber therein and the second casing including an impeller installation space therein; an impeller provided in the impeller installation space so as to be rotatable around a rotation axis; and a vaneless diffuser that has an inlet that communicates with an inside of the second casing and has an outlet that communicates with an inside of the first casing. The vaneless diffuser has a width having a non-axisymmetric distribution in the circumferential direction.

Abstract: A centrifugal compressor includes an asymmetric self-recirculating casing treatment that includes, on an inner face of a casing 10, a suction ring groove 1, a ring guide channel 2 and a back-flow ring groove 3 to form a self-recirculating channel. An axial-direction position Sr from an upstream end face of the suction ring groove to an impeller full blade leading edge 4 or a width br of the suction ring groove 1 is represented as A(?·D??·D)2+A0 and is distributed in a parabolic shape in a circumferential direction. An initial phase angle ?0 is in a range of 0??0?2?. A circumferential angle ? of the casing has a definition range of ?0????0+2?. In the expression, A denotes a parameter of the parabola in the axial-direction position Sr or the width br, and A0 denotes an extreme of the axial-direction position Sr or the width br when corresponding circumferential angle ? and the ? are equal at an extreme point of distribution of the parabola.

Abstract: A centrifugal compressor includes an asymmetric self-recirculating casing treatment that includes, on an inner face of a casing 10, a suction ring groove 1, a ring guide channel 2 and a back-flow ring groove 3 to form a self-recirculating channel. A position or a width of the suction ring groove 1 is distributed in an arc shape in a circumferential direction, and the arc has a center angle ? in a range of 0<??30°.

Abstract: A turbo-compound apparatus having a variable geometry turbocharger turbine and an engine system having the same are provided. The turbo-compound apparatus includes a variable geometry turbocharger turbine connected to an exhaust manifold of the engine and having an adjustable mechanism to distribute the exhaust energy between two turbines; a power turbine fitted downstream of the variable geometry turbocharger turbine and driven by exhaust gas passing through the variable geometry turbocharger turbine, an output end of the power turbine being adapted to connect with a crankshaft of the engine to transfer mechanical work output from the power turbine to the crankshaft; and an actuator configured to control the adjustable mechanism according to actual engine operation conditions to regulate the exhaust energy distribution between the variable geometry turbocharger turbine and the power turbine.

Abstract: A centrifugal compressor includes: a volute casing including a first casing and a second casing that are mutually coupled, the first casing including a volute chamber therein and the second casing including an impeller installation space therein; an impeller provided in the impeller installation space so as to be rotatable around a rotation axis; and a vaneless diffuser that has an inlet that communicates with an inside of the second casing and has an outlet that communicates with an inside of the first casing. The vaneless diffuser has a width having a non-axisymmetric distribution in the circumferential direction.

Abstract: A centrifugal compressor includes an asymmetric self-recirculating casing treatment that includes, on an inner face of a casing 10, a suction ring groove 1, a ring guide channel 2 and a back-flow ring groove 3 to form a self-recirculating channel. An axial distance Sr from an upstream end face of the suction ring groove 1 to an impeller full blade leading edge 4 or a width br of the suction ring groove 1 is represented as A·sin(?+?0)+A0 and is distributed in a sinusoidal shape in a circumferential direction, an initial phase angle ?0 is in a range of 0°??0?360°, and a circumferential angle ? of the casing 10 has a definition range of ?0????0+360°. In the expression, A denotes amplitude of distribution of the axial distance Sr or the width br, and A0 denotes an average of the axial distance Sr or the width br.

Abstract: A centrifugal compressor has a casing 7. In the casing 7 is formed a back-flow channel 9 to return fluid from a downstream position of an impeller full blade leading edge 6a to an upstream position of the impeller full blade leading edge 6a. The back-flow channel 9 includes a suction ring groove 9a and a back-flow ring groove 9b. The suction ring groove opens at the downstream position on the inner face 7a of the casing 7, and extends in the circumferential direction. The back-flow ring groove opens at the upstream position on the inner face 7a, and extends in the circumferential direction. Distribution in the circumferential direction of the axial-direction position of the suction ring groove 9a or a width of the suction ring groove 9a is asymmetric with reference to the rotation axis.

Abstract: A centrifugal compressor includes an asymmetric self-recirculating casing treatment that includes, on an inner face of a casing 10, a suction ring groove 1, a ring guide channel 2 and a back-flow ring groove 3 to form a self-recirculating channel. An axial-direction position Sr from an upstream end face of the suction ring groove to an impeller full blade leading edge 4 or a width br of the suction ring groove 1 is represented as A(?·D??·D)2+A0 and is distributed in a parabolic shape in a circumferential direction. An initial phase angle ?0 is in a range of 0??0?2?. A circumferential angle ? of the casing has a definition range of ?0????0+2?. In the expression, A denotes a parameter of the parabola in the axial-direction position Sr or the width br, and A0 denotes an extreme of the axial-direction position Sr or the width br when corresponding circumferential angle ? and the ? are equal at an extreme point of distribution of the parabola.

Abstract: A centrifugal compressor includes an asymmetric self-recirculating casing treatment that includes, on an inner face of a casing 10, a suction ring groove 1, a ring guide channel 2 and a back-flow ring groove 3 to form a self-recirculating channel. A position or a width of the suction ring groove 1 is distributed in an arc shape in a circumferential direction, and the arc has a center angle a in a range of 0<?30°.

Abstract: The present invention discloses a new and improved kind of chromatographic cake and its manufacturing methods and applications. The objective of this invention is to provide an improved chromatographic apparatus and methods for manufacturing such an apparatus, whereby the separation and simultaneous renaturation and purification of biopolymers can be efficiently performed with excellent results. The chromatographic cakes of this invention generally comprise a chromatographic packing cake with a mobile phase inlet and a mobile phase outlet, together with a chromatographic packing packed into an inner cavity region of the chromatographic packing cake. The ratio of the thickness to the diameter of the inner cavity region of the chromatographic packing cake is less than or equal to 1.

Abstract: The present invention discloses a new and improved kind of chromatographic cake and its manufacturing methods and applications. The objective of this invention is to provide an improved chromatographic apparatus and methods for manufacturing such an apparatus, whereby the separation and simultaneous renaturation and purification of biopolymers can be efficiently performed with excellent results. The chromatographic cakes of this invention generally comprise a chromatographic packing cake with a mobile phase inlet and a mobile phase outlet, together with a chromatographic packing packed into an inner cavity region of the chromatographic packing cake. The ratio of the thickness to the diameter of the inner cavity region of the chromatographic packing cake is less than or equal to 1.