Abstract:
A method and system for drilling a wellbore is described. The system includes a wellbore with a variable density drilling mud, drilling pipe, a bottom hole assembly disposed in the wellbore and a drilling mud processing unit in fluid communication with the wellbore. The variable density drilling mud has compressible particles and drilling fluid. The bottom hole assembly is coupled to the drilling pipe while the drilling mud processing unit is configured to separate the compressible particles from the variable density drilling mud. The compressible particles in this embodiment may include compressible hollow objects filled with pressurized gas an configured to maintain the mud weight between the fracture pressure gradient and the pore pressure gradient. In addition, the system and method may also manage the use of compressible particles having different characteristics, such as size, during the drilling operations.
Abstract:
The present invention relates to novel compounds of 2-propene-1-one series, of general formula (I), their derivatives, analogs, tautomeric forms, stereoisomers, polymorphs, pharmaceutically acceptable salts, pharmaceutically acceptable solvates and pharmaceutically acceptable compositions containing them, wherein R5, R6, Q and Y are as defined in the specification. The present invention also relates to a process for preparing such compounds, compositions containing such compounds, and use of such compound and composition in medicine. The compounds of the general formula (I) induce HSP-70 and are useful for the treatment of diseases accompanying pathological stress in a living mammalian organism, including a human being, such as stroke, myocardial infarction, inflammatory disorder, hepatotoxicity, sepsis, diseases of viral origin, allograft rejection, tumourous diseases, gastric mucosal damage, brain haemorrhage, endothelial dysfunctions, diabetic complications, neuro-degenerative diseases, post-traumatic neuronal damage, acute renal failure, glaucoma and aging related skin degeneration.
Abstract:
A system, method and computer program product are provided including a router and a security sub-system coupled to the router. Such security sub-system includes a plurality of virtual firewalls, a plurality of virtual intrusion prevention systems (IPSs), and a plurality of virtual virus scanners. Further, each of the virtual firewalls, IPSs, and virus scanners is assigned to at least one of a plurality of user and is configured in a user-specific
Abstract:
An exhaust path 3 and a heated portion 5 such as an air duct of an internal combustion engine are connected to each other by a heat pipe 1. A heat pipe working fluid (water) vaporized by the heat of the exhaust gas in a heat receiving portion 1c of the heat pipe 1 is condensed in a heat discharging portion 1d of the heat pipe 1 and heated in the heated portion by the heat of the exhaust gas. An outer cylinder 10 is formed around the casing la of the heat pipe 1, and the exhaust path 3 and the heated portion 5 are connected to each other through heat insulating members 13, 15, while at the same time supporting the heat pipe body through heat insulating members 11. By doing so, the structural strength can be maintained by the outer cylinder and no load is imposed on the heat pipe, so that the thickness of the casing can be reduced. Also, since the heat conduction from the heating portion to the heated portion through the outer cylinder is suppressed by the heat insulating members, the overheating of the heated portion at high temperatures is suppressed.
Abstract:
In an internal combustion engine fuel system having a membrane separator for separating a primary fuel into a high octane fuel and a low octane fuel, and wherein the primary fuel is heated for separation in the membrane separator, the improvement comprising a heat pipe having an evaporator section positioned to be in the heat exchange relationship with exhaust gas from the internal combustion engine under conditions of use; and a heat output area in heat exchange relationship with a primary fuel as it is fed into the separator whereby the primary fuel is heated. In one embodiment the heat pipe is a variable conductance heat pipe having a top operating temperature not greater than about 160° C.
Abstract:
An apparatus removes CO from a hydrogen-rich gas stream in a hydrogen fuel cell system. CO fouls costly catalytic particles in the membrane electrode assemblies. Both a catalyst adapted to perform a water gas shift reaction, and a carbon dioxide adsorbent are disposed in a rotating pressure swing adsorber housing. The adsorption of carbon dioxide shifts equilibrium toward carbon monoxide consumption. A second adsorbent may be disposed in the housing for adsorbing carbon monoxide at low temperatures, and is adapted to desorb carbon monoxide at high temperatures. The present invention advantageously eliminates a unit operation from a space-constrained fuel cell vehicle by combining the WGS catalyst and a CO2 adsorbent in a single reactor/housing. The apparatus further eliminates the use of a PROX reactor, by providing an apparatus which incorporates CO2 adsorption and consequent carbon monoxide consumption in the place of the PROX reactor.
Abstract:
A hydroprocessing process for removing impurities from a feed comprising a hydrocarbonaceous liquid comprises at least two cocurrent, upflow hydroprocessing reaction stages and a non-catalytic, vapor-liquid contacting stage. The reaction and contacting stages may all be in the same reactor vessel. The feed and a hydrogen treat gas are passed up into a catalyst bed which comprises the first reaction stage, which produces a partially hydroprocessed liquid and vapor effluent. This first stage vapor is passed up into the contacting stage in which it contacts a hydrocarbonaceous liquid which reduces the vapor impurity content. The impurity-enriched contacting liquid passes down and mixes with the first stage liquid effluent. The combined effluents and hydrogen are passed up into the second reaction stage to form a processed product liquid and hydrogen-containing vapor effluent. This second reaction stage vapor effluent is passed up into the first stage to provide at least a portion of the hydrogen for the first stage reaction. Additional product liquid may be recovered by cooling the contacting and condensing the purified contacting stage vapor effluent.
Abstract:
A process for automatically providing for periodic surge flow or liquid slugs in the catalyst bed to insure that the catalyst is periodically fully wetted. Therefore, before dry spots develop in the bed and some catalyst particles are deprived of the liquid reactants, the aforesaid liquid pulse or slug will rewet the catalyst. This desired periodic introduction of a liquid slug through a catalyst bed is accomplished by the provision of a plurality of automatically actuating and operating siphon means disposed and distributed across the area of the distributor tray means within the reactor.
Abstract:
The invention is for a fixed bed reactor with two phase gas and liquid flow. The reactor has at least one auxiliary bed of solid particles disposed above the main bed of solid particles. The auxiliary bed has a liquid bypass comprised of hollow tubing extending through the auxiliary bed. Liquid receptacles provide a liquid seal above the liquid bypasses, thereby preventing gas from bypassing along with the liquid. The liquid spilled from the flow receptacles seeks its lowest level and flows through the auxiliary bed. The tubing provides a bypass first for the liquid and later for both the liquid and gas when the auxiliary bed becomes fouled and the liquid seal is thereby broken. This feed arrangement allows for a low pressure drop bypassing of the auxiliary bed, when the auxiliary bed becomes fouled and clogged. The invention is also applicable to other apparatuses which use a flow arrangement similar to fixed bed reactors, but which do not necessarily utilize a chemical reaction. One example of such apparatus is a packed absorption tower having co-current downflow of gas and liquid.
Abstract:
The invention is for a fixed bed reactor with two phase gas and liquid flow. The reactor has at least one auxiliary bed of solid particles disposed above the main bed of solid particles. The auxiliary bed has separate liquid and gas bypasses comprised of hollow tubing extending through the auxiliary bed to a distributor tray. A liquid layer on the tray provides a liquid seal above the liquid bypasses, thereby preventing gas from bypassing along with the liquid. This feed arrangement allows for a low pressure drop bypassing of the auxiliary bed, when the auxiliary bed becomes fouled and clogged. The invention is also applicable to other apparatuses which use a flow arrangement similar to fixed bed reactors, but which do not necessarily utilize a chemical reaction. One example of such apparatus is a packed absorption tower having co-current downflow of gas and liquid.