Abstract: A lighting device includes a photosensitive element, a first pull-up resistor, a light source driver, a current-limiting detecting resistor, a controller and a pull-up resistance adjusting circuit. The two ends of the photosensitive element are respectively connected to a first node and a grounding point. The two ends of the first pull-up resistor are respectively connected to the first node and a second node (connected to an operating voltage source). The detecting signal input end of the controller is connected to the first node via the current-limiting detecting resistor. The voltage input end of the controller is connected to the second node. The driving signal output end of the controller is connected to the light source driver. The first end, second end and third end of the pull-up resistance adjusting circuit are respectively connected to the first node, second node and control signal output end.

Abstract: Disclosed in the present application are a projection device and a method for the projection device. A projection device comprises a light modulation assembly, a lens, a distance sensor, an image collection device and a controller. The method comprises: in response to a start-up instruction for a projection device, starting the projection device; detecting whether there is a blocking object between the projection device and a projection surface according to the positional relationship between a lens, a distance sensor and an image collection device on a first plane and a distance measurement value of the distance sensor, wherein the first plane is a plane on the projection device that is parallel to the projection surface during projection, and the projection surface is used for receiving and displaying projection content, which is projected by a light modulation assembly.

Abstract: A lighting device includes a photosensitive element, a first pull-up resistor, a light source driver, a current-limiting detecting resistor, a controller and a pull-up resistance adjusting circuit. The two ends of the photosensitive element are respectively connected to a first node and a grounding point. The two ends of the first pull-up resistor are respectively connected to the first node and a second node (connected to an operating voltage source). The detecting signal input end of the controller is connected to the first node via the current-limiting detecting resistor. The voltage input end of the controller is connected to the second node. The driving signal output end of the controller is connected to the light source driver. The first end, second end and third end of the pull-up resistance adjusting circuit are respectively connected to the first node, second node and control signal output end.

Abstract: The present disclosure relates to a light energy collecting system and a detection apparatus. Some embodiments of the present disclosure provide a light energy collecting system and a detection apparatus, to correct chromatic aberration, simplify system structure, and improve system reliability and stability.

Abstract: The invention discloses an expandable copolymer resin used for manufacturing a lost foam casting model and a preparation method thereof, wherein the molecular weight of the expandable copolymer resin is 150000-300000, and the expandable copolymer resin comprises mixed monomers, deionized water, a cellulose ether dispersant, sodium salt, an initiator, a foaming agent and a molecular weight regulator; the mixed monomers comprise MMA and ST, wherein MMA accounts for 70-95% wt of the mixed monomers, and ST accounts for 5-30% wt of the mixed monomers. The model formed by the expandable copolymer resin has the advantage of reducing or eliminating carbon defects of castings when casting cast iron and cast steel.

Abstract: The invention discloses an expandable copolymer resin used for manufacturing a lost foam casting model and a preparation method thereof, wherein the molecular weight of the expandable copolymer resin is 150000-300000, and the expandable copolymer resin comprises mixed monomers, deionized water, a cellulose ether dispersant, sodium salt, an initiator, a foaming agent and a molecular weight regulator; the mixed monomers comprise MMA and ST, wherein MMA accounts for 70-95% wt of the mixed monomers, and ST accounts for 5-30% wt of the mixed monomers. The model formed by the expandable copolymer resin has the advantage of reducing or eliminating carbon defects of castings when casting cast iron and cast steel.

Abstract: A gas separation cartridge including a housing comprising an inlet port for an air sample to enter; a top cover attached to the housing; an upper cavity comprising individual chambers comprised of a chemical or an absorbent or a mixture thereof attached to the top cover wherein each end of each chamber has an opening; a bottom cover attached to the upper cavity, wherein the bottom cover comprises a lower cavity, a separate opening for an air sample traveling from an individual chamber to pass through, and a separate opening for an air sample that does not pass through an individual chamber; and a base upon which the bottom cover of the cartridge is seated, wherein the base has an exit port.

Abstract: The present invention discloses a special modified expandable polystyrene copolymer particle for a lost foam, which respectively comprises the following parts by weight: 90 to 100 parts of styrene; 3 to 8 parts of methyl methacrylate; 100 to 140 parts of deionized water; 0.2 to 0.5 part of benzoyl peroxide; 0.2 to 0.5 part of dicumyl peroxide: 0.1 to 0.5 part of tert-butyl peroxybenzoate: 0.001 to 0.01 part of anionic surfactant; 1 to 2 parts of suspension concentrate; 5.0 to 10.0 parts of foaming agent; 0.1 to 0.4 part of nucleator; 0.2 to 2 parts of organic bromine; 0.01 to 0.1 part of molecular weight regulator having the effect of increasing molecular weight, and 0.3 to 0.5 part of surface coating agent.

Abstract: A hydroponic growth system may be integrated into a programmable system providing for the growth of plants. An upper section of a system may include a lighting system able to vary lighting characteristics such as the intensity or spectral content of light provided to the plants and atmospheric systems to control the temperature, flow, or humidity of air around the plants that are mounted on an actuated platform. A control system may execute a program to control the available systems including the actuated above-plant platform to programmably control the height or heights of the systems above plants.

Abstract: A gas separation cartridge including a housing comprising an inlet port for an air sample to enter; a top cover attached to the housing; an upper cavity comprising individual chambers comprised of a chemical or an absorbent or a mixture thereof attached to the top cover wherein each end of each chamber has an opening; a bottom cover attached to the upper cavity, wherein the bottom cover comprises a lower cavity, a separate opening for an air sample traveling from an individual chamber to pass through, and a separate opening for an air sample that does not pass through an individual chamber; and a base upon which the bottom cover of the cartridge is seated, wherein the base has an exit port.

Abstract: A system and method of combining group buying with regular selling is provided. A group-buying company advertises a first product for sale from a group-buying website. The first product is a group-buying deal with deep discount offered for a short period of time. The group-buying websites also provides recommendation information on one or more products based on the first product. The one or more recommended products are supplied by another non-group-buying company. Consumers are able to purchase the one or more recommended products from the group-buying website.

Abstract: A merchandise selection system comprises a merchandise trial selection module, a sales volume prediction module, and a targeted selling module. The trial selection module determines a set of trial parameters including city information, product information, price information, and trial period information. The sales volume prediction module determines estimated sales volume for a product during a sales period in a selected city based on trial result. The targeted selling module determines to feature the product for the sales period in the selected city if the estimated sales volume meets a threshold. The merchandise selection system provides better prediction result, facilitates precise planning, and enables better control of shelf space in each city.

Abstract: A lightweight merchandise distribution system for online group-buying is provided. The distribution system comprises a computer server, a plurality of small distribution centers, and a plurality of delivery entities. The computer server comprises a merchandise sales-prediction module and a distribution center-optimization module. Before a product is featured on a group-buying website, the number of small distribution centers is set up in a densely populated city based on the center-optimization result. The featured product is then pre-allocated to each distribution center based on the sales-prediction result. Each delivery entity comprises a delivery person, a wireless handheld device, and a delivery vehicle. The delivery person preloads the featured products onto the delivery vehicle before receiving any order. The delivery person delivers the ordered product by the delivery vehicle once the purchase order is received from the wireless handheld device.

Abstract: The application relates to a foamable copolymer resin and a process for preparing the same, which comprises firstly adding an organic peroxide initiator, a modifying aid and a foaming agent to a mixed monomers of methyl methacrylate and styrene so as to constitute a homogenous mixture; at the same tine charging a deionized water into a polymerization reactor and adding a dispersant hydroxy ethyl cellulose or hydroxylpropyl cellulose ether with stirring to produce a homogenous mixture, then sealing the reactor and introducing N2 gas to purge the reactor before the above homogenous monomer mixture is added; after the completion of the reaction the residue is washed with water and dewatered and dried, obtaining foamable pellets.

Abstract: The application relates to a foamable copolymer resin and a process for preparing the same, which comprises firstly adding an organic peroxide initiator, a modifying aid and a foaming agent to a mixed monomers of methyl methacrylate and styrene so as to constitute a homogenous mixture; at the same time charging a deionized water into a polymerization reactor and adding a dispersant hydroxy ethyl cellulose or hydroxylpropyl cellulose ether with stirring to produce a homogenous mixture, then sealing the reactor and introducing N2 gas to purge the reactor before the above homogenous monomer mixture is added; after the completion of the reaction the residue is washed with water and dewatered and dried, obtaining foamable pellets.