1142 results about "Interaction forces" patented technology

In one aspect, the invention provides a method for modeling the wear of a fixed cutter bit drilling earth formations. A method for determining wear of a fixed cutter drill bit includes simulating the fixed cutter drill bit drilling an earth formation; determining a cutter-formation interaction force and a relative sliding velocity of a selected area on a cutting surface on a cutter of the fixed cutter drill bit during the drilling; and calculating a wear rate of the selected area based on the cutter-formation interaction force and the relative sliding velocity.

The invention provides a method for preparing graphene through a large-scale aqueous phase. According to the method, graphite serves as a raw material. The method comprises the following steps: intercalating the graphite by adopting an intercalator, so that interlayer spacing between graphene sheet layers is enlarged, and the interaction force between the layers is weakened; and directly treating the intercalated graphite through ultrasonic waves, stripping and uniformly dispersing the graphite in an alkaline aqueous solution with the pH value of 10-14, wherein the content of graphene in the dispersion can be over 100mg/mL (about 10 weight percent of graphene), the content of single-layer graphene in the aqueous phase dispersion is more than 90 percent, the equivalent diameter of the graphene sheet layers can be over 1-10 microns, and a graphene film formed by filtering has a complete lattice structure and high electric conductivity. The prepared high-concentration aqueous phase graphene paste can be stored for a long time and is convenient to transport and use. The method is simple in process flow, high in production efficiency, low in energy consumption and low in cost, a commercially available low-cost reagent is adopted, the reagent is easy to recover, and the production process is environment-friendly and pollution-free.

The invention discloses a method for preparing large-size high-quality graphene with controllable number of layers, wherein graphite powder or flake graphite is mainly adopted as a raw material. The method specifically comprises the steps of intercalating the graphite raw material by virtue of an intercalating agent to initially weaken the intercalation interaction force and obtain different orders of graphite intercalation compounds (GICs); soaking the GICs in an appropriate expander, and then under the case that an auxiliary agent is added or not, enabling the intercalation materials to be quickly reacted with the expander to release a gases to obtain highly expanded wormlike graphene aggregate and further to cause the distances among graphene lamellar layers to be increased; and after certain processing, peeling, and then repeatedly centrifuging and dispersing to obtain a graphene dispersion with different numbers of layers. According to the method disclosed by the invention, the intercalation-expansion-peeling process is involved, raw materials are cheap, the reaction process is simple and easily controlled, and the number of layers of graphene is precisely controlled; the obtained graphene lamellar layers have the advantages of few defects, large size, high conductivity, high yield and the like, the large-scale industrial production is easily implemented, and the problems of high cost, low productivity, poor quality, small size, uncontrollable number of layers and the like in an existing graphene preparation technology are solved.

The invention provides a current collector and a preparation method thereof. The current collector comprises a current collector foil and at least one surface of the current collector foil is coated with coating layers containing graphene and a binder. The preparation method comprises the following steps of dispersing graphene and the binder in a solvent to obtain slurry, coating the slurry on at least one surface of the current collector foil and drying. Graphene of the coating layer has a two-dimensional sheet structure and thus the graphene forms a uniform and compact coating on the surface of the current collector foil so that a contact area of the graphene and the surface of the current collector is greatly improved; a conductive contact between an active material and the current collector is improved; the interface resistance of the current collector and the active material is effectively reduced; and internal resistance of a cell is reduced. Contact areas of graphene layers paved on the surface of the current collector and contact areas of the graphene layers and the current collector are large and thus interactional forces are strong; falling off is difficult; adhesive forces are strong; separation of the active material and the current collector is avoided in charging and discharging; and internal resistance reduction is promoted.

The invention discloses a non-adhesion driving structure for a straddle type railway vehicle. The structure comprises a monorail runway track and a bogie which are matched with each other, and is improved in that: the two sides of the monorail runway track are provided with an induction plate respectively; the two sides of the bogie are provided with a linear motor respectively; and the linear motors and the induction plates correspond one to one, and are arranged opposite. The non-adhesion driving structure has the advantages that: the adhesion driving of the conventional straddle type railway vehicle is changed into non-adhesion driving, and the braking and acceleration of the vehicle are finished by an interaction force between the linear motors and the induction plates, so the load of a traveling wheel is decreased, the stability of the structure is improved and the running cost of the vehicle is decreased.

A method and system for micro-force guided cooperative control that assists the operator in manipulating tissue in the direction of least resistance. A tool holder receives a surgical tool adapted to be held by a robot and a surgeon. A first sensor measures interaction forces between a tip of the surgical tool and tissue of a region of interest. A second sensor measures interaction forces between the surgeon and a handle to the surgical tool. A data processor is configured to perform an algorithm to actively guide the surgical tool by creating a bias towards a path of least resistance and limit directional tool forces of the surgical tool as a function of handle input forces and tip forces. This function offers assistance to challenging retinal membrane peeling procedures that require a surgeon to delicately delaminate fragile tissue that is susceptible to hemorrhage and tearing due to undesirable forces.

The invention relates to an experimental device and method for simulating the extension influence of hydraulic fracturing cracks and natural cracks. Fracturing pipe columns are simulated through steelpipes, planar rock samples are formed through pouring and cured, and then rock samples with random spots are prepared; then the samples are placed into adjustable hydraulic fracturing cavities, unequal ground stress is applied to the two sides of the samples, and then fracturing liquid is injected through the fracturing pipe columns; and meanwhile a high-speed camera is utilized to shoot the crack extension condition in the hydraulic fracturing process, the rock body deformation condition in the hydraulic fracturing process is collected through a deformeter, and the pumping-in pressure and strain change are detected. According to the experimental device and method for simulating the extension influence of the hydraulic fracturing cracks and the natural cracks, the interplaying mechanicalrelation between the hydraulic fracturing cracks and the natural cracks can be intuitively analyzed, the distribution problem after a flow makes contact with the natural cracks can be accurately researched, and meanwhile the complex mechanical behavior such as cracking rules of hydraulic fracturing, rock body deformation caused by hydraulic crack extension and opening, re-starting or dislocation of the natural cracks at different strength is intuitively observed.

A scanning probe microscope and methodology called resonant difference-frequency atomic force ultrasonic microscopy (RDF-AFUM), employs an ultrasonic wave launched from the bottom of a sample while the cantilever of an atomic force microscope, driven at a frequency differing from the ultrasonic frequency by one of the contact resonance frequencies of the cantilever, engages the sample top surface. The nonlinear mixing of the oscillating cantilever and the ultrasonic wave in the region defined by the cantilever tip-sample surface interaction force generates difference-frequency oscillations at the cantilever contact resonance. The resonance-enhanced difference-frequency signals are used to create images of nanoscale near-surface and subsurface features.

The invention discloses a lower limb rehabilitation training robot system based on virtual reality, which comprises a virtual interaction scene module, a physiological parameter acquisition module, a man-machine interaction module, a control module and a lower limb rehabilitation training robot, wherein the virtual interaction scene module simulates motion of a virtual person in a virtual scene and calculates an interaction force between the virtual person and a virtual environment; the man-machine interaction module displays and transmits physiological parameters of a patient, a motion state of the lower limb rehabilitation training robot and the acting forces of the patient in all directions to the control module; the control module generates and issues a control instruction; and the lower limb rehabilitation training robot is responsible for force feedback output under an active rehabilitation condition and traction of the patient for rehabilitation training under a passive rehabilitation training condition. According to the system, simpler virtual scene interaction is achieved by establishing a virtual person model; a real-time and friendly virtual scene interaction system with feedback of a visual sense, an auditory sense and a touch sense is provided for the rehabilitation training robot; and the patient is encouraged to actively perform rehabilitation training.

A separatory material comprising a composite material containing a stimulus-responsive polymer and a substance interacting specifically with a target substance, wherein said stimulus-responsive polymer undergoes a structural change upon a physical stimulus so that the interaction of said substance interacting specifically with the target substance is affected by the chemical or physical environmental change, thereby causing a reversible change in the interaction force with the target substance due to the physical stimulus, which separatory material is characterized in that said stimulus-responsive polymer has no affinity with said substance interacting specifically with the target substance.

The invention discloses a railway infrastructure detection system. The system involves a positioning synchronization subsystem, and a rail geometry detection subsystem, a rail contour detection subsystem, a rail state detection subsystem, a rail wheel force detection subsystem, a catenary geometric parameter detection subsystem, a pantograph-catenary current collection parameter detection subsystem which are in communication with the positioning synchronization subsystem. According to the system, on the basis of the structural characteristics and operation modes of urban rail transit infrastructure, the plurality of detection subsystems are integrated on a urban rail transit electric bus, rail geometric parameters, rail contour abrasion, rail state information, rail wheel interaction force, catenary geometric parameters and pantograph-catenary current collection parameters of the urban rail transit infrastructure are synchronously collected and accurately measured, the detection efficiency is improved, the urban rail transit operation maintenance cost is reduced, and the system can be widely applied to urban rail traffic construction and operation and maintenance.

The invention provides a supporting structure with variable forms and an electronic device having the supporting structure. The supporting structure comprises a fixing module, tail end module assemblies, and flexible module assemblies through which the fixing module and the tail end module assemblies are connected. The flexible module assemblies comprise multiple chain link units, wherein each chain link comprises a supporting piece containing a supporting face and a lower surface which are opposite to each other, and a driving part which extends downwards from one side of the supporting piece. The chain link units are successively connected to each other in a hinged mode through a connecting part on one side of the supporting piece. The flexible module assembly changes its forms by the supporting face driven by the interaction force of the driving parts of the adjacent chain link units. Through the interaction force of the driving parts of adjacent chain link units, different forms of successively hingedly connected supporting faces are constructed so that a supporting structure having flexibly variable forms is formed. The invention also provides an electronic device having the supporting structure.

The invention discloses a Pico/Nano satellite and rocket fixing and separating device. The Pico/Nano satellite and rocket fixing and separating device comprises a bottom plate. Satellite supporting bases, pull rods, pull rod cut-off mechanisms and satellite popping mechanisms are fixed to the bottom plate. At least one pair of satellite supporting bases is arranged. Any one pair of satellite supporting bases is oppositely arranged in pairs. At least one pair of pull rods is arranged. Each pair of pull rods is installed in any one pair of satellite supporting bases respectively. Each pull rod stretches out of a satellite supporting face of the corresponding satellite supporting base to be connected with a satellite and presses the satellite on the satellite supporting face. According to the Pico/Nano satellite and rocket fixing and separating device, when the satellite and the bottom plate are connected, pull force and pressure exerted on the bottom plate are exerted on the same straight line, and therefore the interaction force between the bottom plate and the satellite is reasonably distributed, the integral structure is simple and stable, meanwhile, installing is convenient, and the manufacturing cost is low.

The invention discloses a laser-electric arc compound welding gun which is characterized in that the welding gun respectively adopts ball screw linear guide rail mechanisms driven by three stepping motors or servo motors to precisely adjust the space positions of a laser focal point and an electric arc electrode along x, y and z three right-angle coordinate axis directions, and meanwhile, a gear pair rotation adjustment mechanism driven by one stepping motor or one servo motor to enable the electric arc electrode to freely rotate around the axial line of a laser beam within a 360-degree range; furthermore, by additional arrangement of an electromagnetic anti-splashing device fed with high-frequency alternating current, the compound welding gun controls a moving path of welding splashing under the mutual action between a magnetic field and a vortex, so that pollution caused by the welding splashing to a laser optical system and an electric arc welding gun protection system can be reduced. Due to the structural design, the compound welding gun disclosed by the invention can meet the requirements on efficient digitalized welding of complicated parts and manufacturing of complicated part additives.

A multi-configuration portable electronic device including a first body, a second body, a dual-axis hinge and at least a guiding module is provided. The dual-axis hinge has a first axis pivotally coupled to the first body and a second axis pivotally coupled to the second body. The guiding module prevents the first axis and the second axis from acting simultaneously. The guiding module includes a track disposed in the first body and a slide connected with the second body. The slide has an interaction force with the track so that the slide can move from the second body to couple with the track.

The invention discloses a shift driving device and a combination thereof based on the interaction of a permanent magnet and an electromagnet. The device comprises a driving component, a motion initiating component and a guide component, wherein the driving component and the motion initiating component interacts with each other, the guide component is arranged between the driving component and the motion initiating component for restricting the shift direction of the motion initiating component, a fixed electromagnet or a fixed permanent magnet is used as the driving component, and a mobile permanent magnet or a mobile electromagnet is used as the motion initiating component. The device has the advantages of direct motion driving, simple mechanism, great rigidity, accurate driving shift, simplicity and convenience in control, rapid driving response and high efficiency. Linear reciprocating translational motion or rotating motion is directly generated based on the displacement of magnetic poles. Large stroke and micro stroke are easily realized. Motion force, shift distance and shift accuracy can be controlled through the accurate application of a magnetic field or the intensity of current. The magnetic field is directly used for driving, and a larger driving magnetic field is produced under the combined action of an electromagnetic field and a permanent magnetic field, so that the mechanism has larger driving force.

The invention relates to a method for green environmental-protection preparation of a high-concentration ultra-clean graphene dispersion liquid; graphite or a graphite intercalated compound is mainly used as a raw material and is expanded by a certain way to weaken the interaction force between graphite layers, then in an ionic liquid, stripping is achieved under a certain mechanical force by using interaction between pi-anions and pi-cations, and the high-concentration high-electric-conductivity graphene dispersion liquid is obtained. The preparation process is simple and is easy to control, and does not involve any harsh conditions such as high temperature and high pressure, has low energy consumption, and has no need for use of strong oxidizing agents, so as to avoid destruction of acute oxidization on the structure and properties of graphene. In addition, the method has the advantages of green environment protection, does not introduce any impurities, enables the used ionic liquid to be recycled and used, and is quite suitable for large-scale industrialized production.