Abstract: A speaking user selecting method and apparatus, an electronic device, a storage medium, a computer program product, and a computer program. The method comprises: receiving a first request sent by a first terminal device, the first request being used for determining a speaking user in a user group, wherein the user group comprises at least two users to be selected, and each user to be selected corresponds to one second terminal device; determining a random selection model corresponding to the first request, the random selection model being used for representing a policy for randomly determining a speaking user from the user group; and determining a speaking user from the at least two users to be selected according to the random selection model, and sending identification information of the speaking user to the first terminal device and the second terminal device.

Abstract: A signal transmission method, signal detection method and apparatuses thereof and communication system. The signal transmission apparatus includes a transmitting unit configured to transmit a synchronization signal (SS) block to a user equipment within a time window of a predetermined position in an SS block transmission period. Hence, UE cell search and measurement time is reduced, complexity at the UE is lowered, power consumption of the UE is lowered, cell handover is sped up, communication interruption is avoided, and currently at least one of existing problems is solved.

Abstract: The copolymerization of ethylene with a cyclic mono olefin (such as norbornene) is conducted in the presence of a catalyst system comprising a bridged hafnocene catalyst and a three part activator. The catalyst system provides excellent activity at high polymerization temperatures. Copolymers produced according to this invention have unique microstructure (with methyl branching being observed) and unique rheology.

Abstract: The copolymerization of ethylene with a cyclic mono olefin (such as norbornene) is conducted in the presence of a catalyst system comprising a bridged hafnocene catalyst and a three part activator. The catalyst system provides excellent activity at high polymerization temperatures. Copolymers produced according to this invention have unique microstructure (with methyl branching being observed) and unique rheology.

Abstract: A polyethylene composition including a first polyethylene which is an ethylene copolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution Mw/Mn of <2.3, a second polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 50,000 to 200,000 and a molecular weight distribution Mw/Mn of <2.3, and a third polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 70,000 to 200,000 and a molecular weight distribution Mw/Mn of <2.3, where the first polyethylene has more short chain branching than the second polyethylene or the third polyethylene.

Abstract: The copolymerization of ethylene with an optional comonomer is conducted in the presence of a catalyst having a specific aryloxy ether ligand structure. The process enables very high conversions of ethylene to polyethylene at very short residence times when conducted under conditions of pressures of at least 10.3 MPa and high ethylene feed concentrations of from 70 to 150 grams per liter. Using these polymerization conditions, the level of unsaturation may be controlled by the polymerization temperature: for example, a level of 0.09 vinyl groups per 1000 carbon atoms was observed at a polymerization temperature of 160° C. and a level of 0.22 vinyls per 1000 carbon atoms was observed at 220° C.

Abstract: The copolymerization of ethylene with an optional comonomer is conducted in the presence of a catalyst having a specific aryloxy ether ligand structure. The process enables very high conversions of ethylene to polyethylene at very short residence times when conducted under conditions of pressures of at least 10.3 MPa and high ethylene feed concentrations of from 70 to 150 grams per liter.

Abstract: A polyethylene composition which when made into a film layer having a thickness of about 1 mil exhibits a machine direction (MD) 1% secant modulus of ?190 MPa and an oxygen transmission rate (OTR) of ?650 cm3 per 100 inch2 per day, and when made into a film layer having a thickness of about 2 mil exhibits a seal initiation temperature (SIT) of ?100° C. and an area of hot tack window (AHTW) of ?160 Newtons·° C.

Abstract: A polyethylene composition which when made into a film layer having a thickness of about 1 mil has a machine direction (MD) 1% secant modulus of ?200 MPa and an oxygen transmission rate (OTR) of ?600 cm3 per 100 inch2 per day and when made into a film layer having a thickness of about 2 mil has a seal initiation temperature (SIT) of ?90° C. and an area of hot tack window (AHTW) of ?160 Newtons·° C.

Abstract: A polyethylene composition includes a first polyethylene which is an ethylene copolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution Mw/Mn of <2.3, a second polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 15,000 to 100,000 and a molecular weight distribution Mw/Mn of <2.3, and a third polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution Mw/Mn of >2.3, where the first polyethylene has more short chain branching than the second polyethylene or the third polyethylene. The polyethylene composition has a soluble fraction in a CEF analysis of at least 10 weight percent. Film made from the polyethylene composition may have a machine direction 1% secant modulus of ?190 MPa (at a film thickness of about 1 mil), a seal initiation temperature (SIT) of ?100° C.

Abstract: A polyethylene composition comprises a first polyethylene which is an ethylene copolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution Mw/Mn of <2.3, a second polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 50,000 to 200,000 and a molecular weight distribution Mw/Mn of <2.3, and a third polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 70,000 to 200,000 and a molecular weight distribution Mw/Mn of <2.3, where the first polyethylene has more short chain branching than the second polyethylene or the third polyethylene. The polyethylene composition has a composition distribution breadth index, CDBI50 obtained from a crystallization elution fractionation (CEF) analysis of <45 weight %.

Abstract: A polyethylene composition includes a first polyethylene which is an ethylene copolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution Mw/Mn of <2.3, a second polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 15,000 to 100,000, a molecular weight distribution Mw/Mn of >2.3, and a third polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution Mw/Mn of >2.3, where the first polyethylene has more short chain branching than the second polyethylene or the third polyethylene. The polyethylene composition has a soluble fraction in a CEF analysis of at least 10 weight percent. Film made from the polyethylene composition may have a machine direction 1% secant modulus of 200 ?MPa (at a film thickness of about 1 mil), a seal initiation temperature (SIT) of ?90° C.

Abstract: The copolymerization of ethylene with a cyclic mono olefin (such as norbornene) is conducted in the presence of a catalyst system comprising a bridged hafnocene catalyst and a three part activator. The catalyst system provides excellent activity at high polymerization temperatures. Copolymers produced according to this invention have unique microstructure (with methyl branching being observed) and unique rheology.

Abstract: A polyethylene composition including a first polyethylene which is an ethylene copolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution Mw/Mn of <2.3, a second polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of less than 75,000 and a molecular weight distribution Mw/Mn of <2.3, and a third polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 100,000 to 300,000 and a molecular weight distribution Mw/Mn of >2.3, where the first polyethylene has more short chain branching than the second polyethylene or the third polyethylene. The polyethylene composition has a soluble fraction in a CEF analysis of at least 15 weight percent.

Abstract: A polyethylene composition including a first polyethylene which is an ethylene copolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution Mw/Mn of <2.3, a second polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 50,000 to 200,000 and a molecular weight distribution Mw/Mn of <2.3, and a third polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 70,000 to 200,000 and a molecular weight distribution Mw/Mn of <2.3, where the first polyethylene has more short chain branching than the second polyethylene or the third polyethylene.

Abstract: In some embodiments disclosed herein are polyethylene composition including a first polyethylene which is an ethylene copolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution Mw/Mn of <2.3, a second polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of less than 75,000 and a molecular weight distribution Mw/Mn of <2.3, a third polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of less than 75,000 and a molecular weight distribution Mw/Mn of <2.3, and a fourth polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 100,000 to 250,000 and a molecular weight distribution Mw/Mn of >2.3, where the first polyethylene has more short chain branching than the second polyethylene or the third polyethylene. The polyethylene composition may have a soluble fraction in a CEF analysis of at least 7.

Abstract: The various embodiments provide, a magnesium titanium polymerization procatalyst, and methods for making and using the same.

Abstract: A continuous solution polymerization process is disclosed wherein at least two catalyst formulations are employed. A first homogeneous catalyst formulation is employed in a first reactor to produce a first ethylene interpolymer and a first heterogeneous catalyst formulation is employed in a second reactor to produce a second ethylene interpolymer. Optionally a third ethylene interpolymer is formed in a third reactor. The resulting ethylene interpolymer products possess desirable properties in a variety of end use applications, for example in film applications. A means for increasing the molecular weight of the first ethylene interpolymer is disclosed and/or a means for increasing the temperature of the first reactor, relative to a third homogeneous catalyst formulation. A means for reducing the (?-olefin/ethylene) weight ratio in the first reactor is disclosed and/or reducing the density of the first ethylene interpolymer, relative to a third homogeneous catalyst formulation.

Abstract: A continuous solution polymerization process is disclosed wherein at least two homogeneous catalyst formulations are employed. A first homogeneous catalyst formulation is employed in a first reactor to produce a first ethylene interpolymer and a second homogeneous catalyst formulation is employed in a second reactor to produce a second ethylene interpolymer. Optionally a third ethylene interpolymer is formed in a third reactor. The resulting ethylene interpolymer products possess desirable properties in a variety of end use applications, for example in film applications. A means for increasing the molecular weight of the first ethylene interpolymer is disclosed and/or a means for increasing the temperature of the first reactor, relative to the third homogeneous catalyst formulation. A means for reducing the (?-olefin/ethylene) weight ratio in the first reactor is disclosed and/or reducing the density of the first ethylene interpolymer, relative to the third homogeneous catalyst formulation.

Abstract: A continuous solution polymerization process is disclosed wherein at least two catalyst formulations are employed. A first homogeneous catalyst formulation is employed in a first reactor to produce a first ethylene interpolymer and a first heterogeneous catalyst formulation is employed in a second reactor to produce a second ethylene interpolymer. Optionally a third ethylene interpolymer is formed in a third reactor. The resulting ethylene interpolymer products possess desirable properties in a variety of end use applications, for example in film applications. A means for increasing the molecular weight of the first ethylene interpolymer is disclosed and/or a means for increasing the temperature of the first reactor, relative to a third homogeneous catalyst formulation. A means for reducing the (?-olefin/ethylene) weight ratio in the first reactor is disclosed and/or reducing the density of the first ethylene interpolymer, relative to a third homogeneous catalyst formulation.