摘要:
A polyethylene powder is described having a molecular weight in the range of from 3,000,000 g/mol to less than 4,000,000 g/mol as determined by ASTM 4020 and a bulk density of 0.10 to 0.20 g/cm 3 . On sintering, the polyethylene powder produces a porous article having an elastic modulus of at least 90 MPa.
摘要:
A polyethylene powder has a molecular weight in the range of about 300,000 g/mol to about 2,000,000 g/mol as determined by ASTM-D 4020, an average particle size, D 50 , between about 300 and about 1500 μm, and a bulk density between about 0.25 and about 0.5 g/ml. On sintering, the polyethylene powder produces a porous article having a porosity of at least 45% and a pressure drop less than 5 mbar. The porous article is useful in, for example, wastewater aeration and capillary and filtration applications.
摘要:
A method of providing electrical power using a split bus configuration includes receiving a first direct current at a positive bus of a split bus, where the first direct current originates from a first fuel cell segment. A second direct current is received at a negative bus of the split bus, where the second direct current originates from a second fuel cell segment. A third direct current is also received at the split bus such that a combined direct current is formed including the first direct current, the second direct current, and the third direct current. The third direct current originates from an alternative direct current (DC) source. The combined direct current is provided to an inverter such that an alternating current is generated for a load.
摘要:
A method for charging electric vehicles includes receiving information regarding an electric vehicle. At least a portion of the information is received through a vehicle interface configured to place a battery of the electric vehicle into electrical communication with a fuel cell system. A charge is delivered from the fuel cell system to the battery of the electric vehicle through the vehicle interface without use of a direct current to alternating current (DC/AC) converter. The charge is delivered based at least in part on the information.
摘要:
Systems, methods and devices for power generation systems are described. In particular, embodiments of the invention relate to the architecture of power conditioning systems for use with fuel cells and methods used therein. More particularly, embodiments of the present invention relate to methods and systems usable to reduce ripple currents in fuel cells.
摘要:
Spunbonded fabrics are formed by melt-spinning a blend comprised of a major amount of an uncured substantially amorphous polyarylene sulfide and a minor amount of a crystallinity enhancer to obtain a nonwoven mass of filaments, and thereafter passing the nonwoven mass of filaments through a nip of heated calendering rolls to form a spunbonded fabric therefrom having at last substantially crystalline surface regions. Preferably, blending minor amounts of a polyolefin (e.g., polypropylene) with an uncured polyarylene sulfide (e.g., polyphenylene sulfide) allows spunbonded nonwoven fabrics to be formed which do not suffer from the drawbacks noted above. More specifically, spunbonded fabrics formed of a blend of PPS and polypropylene may be calendered (bonded) at temperatures greater than between about 110 to about 125 ° C (preferably greater than about 140 ° C), and exhibit lengthwise and widthwise shrinkage after heatsetting at 120 ° C for 3 minutes which is less than about 5%.
摘要:
Disclosed are filters, smoking devices, related articles and apparatus, and related methods. The filters include porous masses that have an active particle and a binder particle, wherein the active particle comprises carbon and the porous mass has a carbon loading of at least about 6 rag/mm and an encapsulated pressure drop of about 20 mm of water or less per mm of porous mass.
摘要:
Disclosed are filters, smoking devices, related articles and apparatus, and related methods. The filters have porous masses, the porous masses having an active particle and a binder particle, wherein the active particle includes an element selected from the group consisting of: a nano-scaled carbon particle, a carbon nanotube having at least one wall, a carbon nanohoro, a bamboo-like carbon nanostructure, a fullerene, a fullerene aggregate, graphene, a few layer graphene, oxidized graphene, a iron oxide nanoparticle, a nanoparticle, a metal nanoparticle, a gold nanoparticle, a silver nanoparticle, a metal oxide nanoparticle, an alumina nanoparticle, a magnetic nanoparticle, a paramagnetic nanoparticle, a superparamagnetic nanoparticle, a gadolinium oxide nanoparticle, a hematite nanoparticle, a magnetite nanoparticle, a gado-nanotube, an en do fullerene, Gd@C60, a core-shell nanoparticle, an onionated nanoparticle, a nanosheli, an onionated iron oxide nanoparticle, and any combination thereof.
摘要:
A method for charging electric vehicles includes receiving information regarding an electric vehicle. At least a portion of the information is received through a vehicle interface configured to place a battery of the electric vehicle into electrical communication with a fuel cell system. A charge is delivered from the fuel cell system to the battery of the electric vehicle through the vehicle interface without use of a direct current to alternating current (DC/AC) converter. The charge is delivered based at least in part on the information.
摘要:
Systems and methods for power conversion are illustrated. Power conversion architecture for fuel cell systems in particular are described that use dual bus architectures having stack segment pairs and a center-tapped neutral line, and/or an architecture employing integer multiple of three DC/DC converter branches.