34results about How to "Short flight distance" patented technology

An object of the present invention is to provide a golf ball having an improved controllability and shot feeling while maintaining a flight distance on driver shots. The present invention provides a golf ball having a core, an intermediate layer disposed around the core, and a cover disposed around the intermediate layer, wherein the core has a center and an envelope layer disposed around the center, and has a specific hardness distribution, and the intermediate layer is formed from an intermediate layer composition comprising, as a resin component, (A) a modified polyester elastomer and (B) a binary ionomer resin, and having a flexural modulus ranging from 150 MPa to 450 MPa, a maximum loss factor (tan δ) between −20° C. and 0° C. of 0.08 or less, a repulsive modulus of 55% or more, and a slab hardness ranging from 60 to 90 in JIS-hardness.

A golf ball includes a spherical core and a cover covering the spherical core, wherein the cover is formed from a polyurethane composition containing a polyurethane elastomer as a resin component, the polyurethane composition has a shear loss modulus G″ of more than 5.03×10⁶ Pa and 1.17×10⁸ Pa or less when measured in a shear mode using a dynamic viscoelasticity measuring apparatus at the conditions of the temperature of 0° C., and the oscillation frequency of 10 Hz, the golf ball has a hardness distribution that R² of a linear approximate curve determined by a least-squares method is 0.95 or more, when plotting center hardness (JIS-C) of the spherical core, hardness (JIS-C) measured at intervals of 2.5 mm from the center of the spherical core, surface hardness (JIS-C) of the spherical core, and slab hardness (JIS-C) of the cover versus distances from the center of the spherical core.

The present invention provides a golf ball comprising a spherical core and at least one cover layer covering the spherical core, wherein the cover is formed from a polyurethane composition containing a polyurethane elastomer as a resin component, the polyurethane composition satisfying properties of rebound resilience of 54% or more and a shear loss modulus G″ of 5.03×10⁶ Pa or less when measured in a shear mode using a dynamic viscoelasticity measuring apparatus at the conditions of the temperature of 0° C., and the oscillation frequency of 10 Hz, and the spherical core has a hardness distribution that R² of a linear approximate curve determined by a least-squares method is 0.95 or more, when plotting JIS-C hardness measured at a center, a surface and at intervals of 2.5 mm from the center of the spherical core, versus distances from the center of the spherical core.

The invention discloses an automatic unmanned plane express delivery shortest path program method. The address information of each to-be-delivered express is scanned through scanning equipment, all target sites of a present delivery task are determined, and the shortest path starting from an express distribution center, passing by all the target sites and finally returning back to the express distribution center is programmed. An initialization algorithm is firstly provided, a population including a series of molecules is generated, and each molecule represents a feasible path satisfying the delivery task; four corresponding chemical reaction sub algorithms are further provided, including a decomposition algorithm, a synthesis algorithm, a local search algorithm and a greedy search algorithm, iteration is carried out according to relevant rules, the molecule population is made to realize continuous evolution till iteration termination conditions are satisfied, a molecule of the population having the smallest potential energy is found out, and the optimal path is programmed. The method is advantaged in that on the condition that the delivery task of all the target express sites is accomplished, the total flight path of the unmanned plane is the shortest, the total consumption time is the shortest, consumption energy is effectively reduced, and express delivery efficiency is improved.

The invention discloses an air route planning method for multi-unmanned aerial vehicle target positioning, which is used for solving the technical problem of poor practicability of an existing unmanned aerial vehicle air route planning method. According to the technical scheme, the method comprises the steps of firstly, enabling a navigation system of an unmanned aerial vehicle to obtain the position information of the unmanned aerial vehicle, and searching to obtain the approximate position of a ground fixed target; and obtaining the flight speed v, the maximum roll angle and the radius R ofa trajectory circle flying around the fixed target of the unmanned aerial vehicle as the initialization parameters. Under the condition that the initial positions of the multiple unmanned aerial vehicles are random, it can be guaranteed that the multiple unmanned aerial vehicles can rapidly reach the space above the target, and an equidistant formation configuration on a trajectory circle is rapidly formed. According to the method, the information needed by planning is little, the engineering implementation is easy, the calculated amount is very small, and the planning speed is high; the formed planned road section only has a straight line section and a curved line section, the flight distance is as short as possible, the flight time is as short as possible, and the practicability is good.

An object of the present invention is to provide a golf ball cover resin composition containing an ionomer resin with an excellent resilience and fluidity. Another object of the present invention is to provide a golf ball using an ionomer resin for a cover, with an excellent shot feeling, durability and resilience. The present invention provides a golf ball cover resin composition comprising (A) an ionomer resin consisting of a metal ion-neutralized product of a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and an α,β-unsaturated carboxylic acid ester; (B) a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and an α,β-unsaturated carboxylic acid ester, and (C) a zinc compound, wherein a content ratio ((A)/(B)) of (A) component to (B) component ranges from 50/50 to 80/20 in a mass ratio and a content of (C) component ranges from 0.1 part to 20 parts with respect to 100 parts by mass of a sum of (A) component and (B) component, and the golf ball cover resin composition has a melt flow rate (190° C., 2.16 kg) of 5 g/10 min or more.

The invention discloses a sabot separation device of a high-speed air cannon. The sabot separation device comprises a vacuum cavity, a deflating hole is formed in the vacuum cavity, and a thin film isarranged on the deflating hole. The separation device has small influence to the speed and attitude of an emitted projectile body and is convenient to install and maintain

The invention provides a course reversal method and device of an unmanned aerial vehicle, and relates to the field of unmanned aerial vehicles. The problem that an unmanned aerial vehicle has a relatively large risk in a flight process of flying to a standby landing point. The specific technical scheme is as follows: acquiring a target route, wherein the target route is a flight route of a currently executed flight task of the unmanned aerial vehicle; acquiring a standby landing point list, wherein the standby landing point list comprises at least one standby landing point; matching a course reversal point of the unmanned aerial vehicle with the at least one standby landing point according to the target route and a preset algorithm; determining a landing point of the unmanned aerial vehicle from the at least one standby landing point according to a matching result; and controlling the unmanned aerial vehicle to fly to the landing point along the target route. The unmanned aerial vehicle course reversal method and device provided by the invention are applied to course reversal of unmanned aerial vehicles.

An object of the present invention is to provide a golf ball traveling a great flight distance on driver shots and an excellent shot feeling. The present invention provides a golf ball comprising a spherical core, an intermediate layer covering the spherical core, and a cover covering the intermediate layer, wherein a material hardness (Hm) of a resin composition constituting the intermediate layer ranges from 65 to 80 in Shore D hardness, a material hardness (Hc) of a resin composition constituting the cover ranges from 57 to 72 in Shore D hardness, a hardness difference (Hm−Hc) between the material hardness (Hm) and the material hardness (Hc) is more than 0, and the intermediate layer has a surface hardness satisfying a hardness difference (HmsC−HmsD) between a hardness thereof shown in Shore C hardness (HmsC) and a hardness thereof shown in Shore D hardness (HmsD) of 27 or less.

An object of the present invention is to provide a golf ball resin composition with an excellent resilience and fluidity. Another object of the present invention is to provide a golf ball resin composition with a high hardness and durability. Yet another object of the present invention is to provide a golf ball traveling a great distance with an ionomer cover. The present invention provides a golf ball resin composition comprising, (A) an ionomer resin consisting of a metal ion-neutralized product of a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms; (B) a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, and (C) a zinc compound, wherein a content ratio ((A)/(B)) of (A) component to (B) component ranges from 50/50 to 80/20 in a mass ratio and a content of (C) component ranges from 0.1 part to 20 parts with respect to 100 parts by mass of a sum of (A) component and (B) component, and the golf ball resin composition has a melt flow rate (190° C., 2.16 kg) of 15 g/10 min or more.

An object of the present invention is to improve the durability of the golf ball without substantially lowering the spin performance. The present invention provides a golf ball comprising a spherical core and a cover covering the spherical core, wherein the cover contains: (A) a base resin component, and (B) resin fine particles containing a polyrotaxane component having a cyclodextrin, a linear molecule penetrating the cyclic structure of the cyclodextrin in a skewering manner, and blocking groups located at both terminals of the linear molecule to prevent disassociation of the cyclodextrin, wherein at least a part of hydroxyl groups of the cyclodextrin is modified with a caprolactone chain via a —O—C₃H₆—O— group.

An object of the present invention is to provide a novel golf ball material that controls the spin rate on the approach shots while suppressing the change in the spin rate on the driver shots. Another object of the present invention is to provide a golf ball which produces a high spin rate on the approach shots and a low spin rate on the driver shots. The present invention provides a golf ball resin composition comprising: a polyurethane having a polyol component having a number average molecular weight from 200 to 1,500 as a constituting component.