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Jaw structure for electrosurgical instrument and method of use

An electrosurgical medical device and technique for creating thermal welds in engaged tissue that provides very high compressive forces. In one exemplary embodiment, at least one jaw of the instrument defines a tissue engagement plane carrying first and second surface portions that comprise (i) an electrically conductive material and (ii) a positive temperature coefficient (PTC) material having a selected increased resistance that differs at each selected increased temperature over a targeted treatment range. One type of PTC material is a doped ceramic that can be engineered to exhibit a selected positively sloped temperature-resistance curve over about 37° C. to 100° C. The 70° C. to 100° C. range can bracket a targeted “thermal treatment range” at which tissue welded can be accomplished. The engineered resistance of the PTC matrix at the upper end of the temperature range will terminate current flow through the matrix. In one mode of operation, the engagement plane cause ohmic heating within tissue from Rf energy delivery tissue PTC matrix is heated to exceed the treatment range. Thereafter, energy density in the engaged tissue will be modulated as the conductivity of the second portion hovers within the targeted treatment range to thereby provide optical tissue heating for purposes of tissue welding.
Owner:ETHICON ENDO SURGERY INC

Implant to be implanted in bone tissue or in bone tissue supplemented with bone substitute material

An implant (1) to be implanted in bone tissue, e.g. a dental implant or an implant for an orthopedic application, comprises surface regions (4) of a first type which have e.g. osseo-integrative, inflammation-inhibiting, infection-combating and/or growth-promoting properties, and surface regions (8) of a second type which consist of a material being liquefiable by mechanical oscillation. The implant is positioned in an opening of e.g. a jawbone and then mechanical oscillations, e.g. ultrasound is applied to it while it is pressed against the bone. The liquefiable material is such liquefied at least partly and is pressed into unevennesses and pores of the surrounding bone tissue where after resolidification it forms a positive-fit connection between the implant and the bone tissue. The surface regions of the two types are arranged and dimensioned such that, during implantation, the liquefied material does not flow or flows only to a clinically irrelevant degree over the surface regions of the first type such enabling the biologically integrative properties of these surface regions to start acting directly after implantation. The implant achieves with the help of the named positive fit a very good (primary) stability, i.e. it can be loaded immediately after implantation. By this, negative effects of non-loading are prevented and relative movements between implant and bone tissue are reduced to physiological measures and therefore have an osseo-integration promoting effect.
Owner:WOODWELDING

Multiple-clutch device

The invention is directed to a multiple-clutch device, such as a double-clutch device, for arranging in a drivetrain of a motor vehicle between a drive unit and a transmission, wherein the clutch device has a first clutch arrangement associated with a first transmission input shaft of the transmission and a second clutch arrangement associated with a second transmission input shaft of the transmission for transmitting torque between the drive unit and the transmission. According to one aspect of the invention, it is suggested that plates in a plate stack of a clutch arrangement constructed as a plate clutch arrangement which have at least one friction facing can be brought into frictional engagement with plates having no friction facing, wherein at least one of the plates not having a friction facing is thicker in axial direction than friction facing carrying elements of adjacent plates having at least one friction facing. Alternatively or in addition, it is suggested that at least one plate which has at least one friction facing of sintered material and at least one plate which has at least one friction facing made of another friction facing material are provided in the plate stack, wherein the other friction facing material has a progressive frictional coefficient curve (dlambd / dDELTAN) in relation to a slip speed (DELTAN).
Owner:ZF FRIEDRICHSHAFEN AG +1

Molten salt heat storage type electric heating central heating system

The invention relates to a molten salt heat storage type electric heating central heating system, and belongs to the technical field of heat storage. The molten salt heat storage type electric heating central heating system comprises a molten salt electric heater, a high-temperature hot salt tank, a low-temperature cold salt tank, a molten salt pump, a molten salt-water heat exchanger and a heat user. During the time period of low-price low off-peak electricity at night, the molten salt in the cold salt tank is pumped out through the molten salt pump to be conveyed to the molten salt electric heater for heating, and enters the hot salt tank after being heated up to high temperature. During the time period of a power utilization peak, the high-temperature molten salt, with accumulated heat, in the hot salt tank is pumped put through the molten salt pump to be conveyed to the molten salt-water heat exchanger and heats water used for municipal heating to produce hot water for supplying heat to residents. On the basis of a coal-fired boiler central heating system which is in general use at present, only a boiler room of the central heating system needs to be transformed into the molten salt heat storage type electric heating system, and neither a municipal heat supply pipe network nor heat supply terminal equipment needs to be transformed. Besides, the molten salt heat storage type electric heating central heating system can cut down a peak to supplement a trough and reduce the usage amount of coal, thereby playing a role in protecting the environment.
Owner:中投亿星新能源投资有限公司

High Power Dense Down-Hole Heating Device for Enhanced Oil, Natural Gas, Hydrocarbon, and Related Commodity Recovery

ActiveUS20160053596A1Great transmission efficiencyIncreased power levelInsulationFluid removalCapital costHeating system
Electrical down-hole heating devices help enhance the recovery of thick waxy oil, heavy oil, bitumen, natural gas, hydrocarbons, and related commodities by lowering the viscosity and raising the pressures of the surrounding fluid and gas. In addition, the use of the more energy efficient electrical heat can help reduce the amount, and in some cases eliminate the use altogether, of less energy efficient steam to heat the oil. The higher power density superconducting down-hole heating system can enable the in-situ generation of steam down-hole within the confines of the well-bore. The in-situ generation of steam with this device has multiple benefits including reductions in capital costs of the above ground steam plant, increased energy efficiency, reduced greenhouse gas emission, and minimizing water usage and its corresponding reclamation costs. Common types of electrical down-hole heaters include: a) radiative type, b) inductive type, or c) resistive type. A superconducting down-hole heater has many advantages over conventional normal conducting down-hole heaters including: higher power transmission density, higher recovery fluid and gas throughput, increased energy efficiency, higher production capacity per well-bore, and more environmentally friendly fluid and natural gas extraction. Down-hole heaters involving superconductors and cryogenically cooled non-superconductors are disclosed. Additional enhancements involving coil rotation and/or vibration, well-casing rotation and/or vibration, and direct current power sources are disclosed.
In addition, superconducting cables used to transmit large amounts of electric power to facilitate fracturing of shale and rock in subterranean down-hole wells is disclosed.
Owner:REY CHRISTOPHER M

Control method for combined refrigerating multi-split air conditioner system

The invention discloses a control method for a combined refrigerating multi-split air conditioner system. The multi-split air conditioner system is characterized in that two or more outdoor combined refrigerating modules are arranged the outdoor side to form a cold source system of the multi-split air conditioner system, each outdoor combined refrigerating module is composed of a first refrigerant vapor compression and refrigeration circulating loop and a second refrigerant circulating loop, one or more direct evaporation type indoor air cooler modules are arranged at the indoor side, and a refrigerant storing and conveying unit is connected with the part between each outdoor combined refrigerating module and the corresponding indoor air cooler module to form a closed circulating system through a liquid collecting tube, a main liquid supply tube and a main air return tube. According to the control method for the combined refrigerating multi-split air conditioner system, the number of the indoor and outdoor modules is decided according to the designed thermal load of an air conditioner, and the control method precisely regulates the refrigerating capacity to meet the heat control needs of round-the-clock running data machine rooms and electronic equipment; the control method for the combined refrigerating multi-split air conditioner system is capable of making the maximum use of the natural cold source of the day and night, transition season and winter so as to realize the great energy conservation and emission reduction of the air conditioner system.
Owner:CHINA YANGZI GRP CHUZHOU YANGZI AIR CONDITIONERCO

New concept high-speed aerocraft propulsion system layout method

The invention provides a new concept high-speed aerocraft propulsion system layout method. Two cycles are built in a propulsion system, namely a Brayton cycle with the air as the working medium and a closed cycle with supercritical state fluid as the working medium. The two cycles are coupled through a supercritical microscopic scale heat exchange technology, a supercritical state fluid turbine and compressor power balance. By adjusting related valves, the propulsion system can be in a turbofan engine model when taking off or flying at a low speed and in a turbine rocket engine model when flying at a high Mach number, so that it is guaranteed that the aerocraft can effectively cruise for a long time in both a subsonic state and a supersonic state. Through the supercritical microscopic scale heat exchange technology, the gas flow temperature at an inlet of a compressor can be effectively reduced when the propulsion system is flying at a high speed, and when the supercritical microscopic scale heat exchange technology is applied in combination with a closed cycle technology, optical distribution of energy of the propulsion system can be achieved. By means of the method, the defects of the propulsion system of an existing high-speed aerocraft are overcome, and working performance of the high-speed aerocraft propulsion system is remarkably improved when Ma ranges from 0 to 5.
Owner:BEIHANG UNIV

Combined type refrigeration and multi-connected air conditioning system

The invention discloses a combined refrigeration and multi-connected air conditioning system which is characterized in that a cold source system of the multi-connected air conditioning system, which is composed of two or more than two outdoor composite refrigeration modules is arranged outdoors; each outdoor combined refrigeration module is formed by compositing a first refrigerant vapor compression refrigeration cycle loop and a second refrigerant cycle loop; one or more direct evaporative indoor air cooler modules are arranged indoors, and a refrigerant storage and transmission unit is connected between each outdoor composite refrigeration module and the corresponding indoor air cooler module to form a closed cycle system through a liquid collecting pipe, a liquid supply main pipe and a return air main pipe. According to the combined refrigeration and multi-connected air conditioning system, the number of the indoor and outdoor modules is set according to the design heating loads of air conditioning objects, refrigerating capacity is precisely regulated, the thermal control demands of various all-weather running data rooms and electronic devices are met, and natural cold sources in days and nights, transition seasons and winters can be used to the maximum extent to realize energy conservation and emission reduction of the air conditioning system.
Owner:CHINA YANGZI GRP CHUZHOU YANGZI AIR CONDITIONERCO
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