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4766 results about "Lower limit" patented technology

Lower limit refers to the smallest value in a class. Lower limit is also called as infimum limit, liminf, inferior limit or inner limit.

Electronic cigarette and control method thereof

The invention provides an electronic cigarette and a control method thereof. The electronic cigarette comprises a heating wire assembly, a power source and a controller. The heating wire assembly is used for generating heat and comprises heating wires, wherein the resistance value of the heating wires changes along with the changes of temperatures. The power source is used for providing voltages for the heating wire assembly. The controller is electrically connected with the heating wire assembly and the power source and used for controlling the power source to output the voltages. The controller comprises a temperature detecting module which is used for detecting the resistance value of the heating wires to obtain the real-time temperature of the heating wire assembly, an upper limit heating temperature and a lower limit heating temperature are set in the temperature detecting module, the controller controls the power source to output a first voltage when the real-time temperature is smaller than or equal to the lower limit heating temperature and controls the power source to output a second voltage when the real-time temperature is larger than or equal to the upper limit heating temperature, the second voltage is smaller than the first voltage, and the controller controls the power source to keep outputting the current voltage when the real-time temperature is larger than the lower limit heating temperature and smaller than the upper limit heating temperature. The electronic cigarette and the control method thereof can ensure the taste consistency of the smoke of all times and save electric quantity.

Determining method for surveying reserves of hypotonic clastic rock oil-gas reservoir

The invention relates to a determining method for surveying the reserves of hypotonic clastic rock oil-gas reservoir positioned on a clastic rock oil (gas) geological reservoir enrichment boundary, comprising the following steps of: carrying out statistical regression on the daily produced oil-gas data and water data of the traditional testing oil well and the traditional testing gas well and thecorresponding physical data, oil-bearing data and electrical data of an oil layer to determine the physical lower limit value, the oil-bearing lower limit value and the electrical lower limit value of an oil-gas layer, which correspond to industrial oil-gas flows; determining the minimum values of output and a sand body thickness according to the relationship between an effective thickness and test oil output and between the sand body thickness and test production; determining the area boundary of the oil-gas reservoir by using a sandrock thickness isoline method and an effective thickness isoline method; and calculating the reserves of the hypotonic clastic rock oil-gas reservoir. The invention solves the problem that the oil-bearing area of the traditional hypotonic clastic rock oil (gas) reservoir is extrapolated depending on artificial well points, is convenient to apply in the calculation of the reserves, can not only be used for more accurately calculating the reserves of oil (gas) reservoir, but also furthest save the exploration discovery workload and reduce the discovery cost of ton reserves, thereby enhancing the economic benefits of oil-gas exploration and development.

Method for group matching of power lithium-ion rechargeable battery

The invention discloses a method for group matching of power lithium-ion rechargeable batteries. The method comprises the following steps: one-step charge and discharge detection is conducted to the power lithium-ion rechargeable batteries and the batteries with capacities larger than lower limit capacity are taken as acceptable batteries; the acceptable batteries are charged to a state with 50-90 percent of rated capacity and the rechargeable batteries with acceptable voltage drop are sorted; the obtained acceptable batteries are fully charged and are connected in parallel for at least 4 hours to enable the voltage difference between any two rechargeable batteries to be less than or equal to 1mV; the obtained rechargeable batteries are connected in series to discharge, the voltage of each rechargeable battery during discharge is acquired and recorded, and the discharge is stopped when the voltage of any battery reaches cutoff voltage; and a voltage difference standard is set according to the number of series batteries required for group matching and the battery voltage at the moment of discharge cutoff, and the batteries with voltage differences within the preset range are matched into a group. Since the parameters of the batteries are measured and sorted under the simulated battery use conditions and the single rechargeable batteries with close characteristics are sorted, the quality of the group matching is improved.

Preparation method for silicon carbide ceramic tube or rod

The invention relates to a preparation method for a silicon carbide ceramic tube or rod. An extrusion moulding method is adopted to form a blank body; a normal pressure sintering method is adopted for sintering; and submicron level silicon carbide powder and additives are taken as main raw materials. The preparation method comprises the following steps: 1) carrying out ball milling on the main raw materials by a dry method, adding water, a dispersant, a plasticizer, a lubricant and a liquid state binder, and then carrying out ball milling by a wet method; 2) adopting a spray granulation process to granulate silicon carbide slurry; 3) extruding the blank body by a one-shot direct extrusion moulding method after vacuum pug, corrosion, and vacuum pug; 4) drying the molded blank body by a stage drying mechanism; and 5) placing the blank body of the silicon carbide ceramic tube or rod in a vacuum furnace and carrying out sintering for two times by taking argon gas as protective gas. The high temperature resisting strength and the corrosion resistance of the silicon carbide ceramic tube or rod prepared by the method are both better than those of a reactive sintered product. Compared with a hot press sintering method, the method has lower limit on the product shape and size, and lower cost. The method is suitable for the industrialized production.

Control system for distributed power generation, conversion, and storage system

A distributed power generating system enables very rapid and reliable start-up of an engine used to generate back-up power, thereby substantially reducing the need for stored power. More particularly, the distributed power generating system comprises a power bus electrically coupled to commercial power and to a load, an engine comprising a rotatable shaft, a starter/generator operatively coupled to the shaft of the engine and electrically coupled to the power bus, and a temporary storage device electrically coupled to the power bus. The distributed power generating system further comprises a control system adapted to detect a failure of the commercial power and cause the starter/generator to start the engine from a standstill condition. The control system provides the starter/generator with an initial voltage vector selected to rapidly bring the engine to an operational speed sustainable by the engine alone. The temporary storage device supplies electrical power to the power bus for delivery to the load and for powering the starter/generator until the engine reaches the operational speed, whereupon the control system causes the starter/generator to take over supply of electrical power to the power bus for delivery to the load. The control system starts the engine upon detection of a voltage on the power bus below a predetermined lower limit. After the engine has started, the control system monitors speed of the engine to determine whether the operational speed is reached. The control system terminates operation of the engine upon detection of a voltage on the power bus above a predetermined upper limit.
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