Showing papers on "Paddle published in 2015"

Match analysis of elite players during paddle tennis competition

Abstract: The aim of this study was to determine notational anaylisis structure in paddle tennis in relation to gender. Sixteen semi-final or final paddle tennis matches (8 men and 8 women) of the circuit Paddle Pro Tour were selected. All matches were recorded with a wide-angle camera (Panasonic HC-700; Japan) and were analysed with Kinovea 8.15 software according to Anguera’s method. Match analysis (total time, real time, rest time, work-to-rest-time, points, strokes for points, rally time, and rest rally time) and shots (service, return, ground strokes, net strokes, and indirect strokes) were studied. The results showed statistically significant differences in real time, rest time and number of strokes with higher values in female than in male paddle tennis players (p<.05). A statistical difference was shown in percentage of type of strokes (backhand volley, indirect forehand lob, backhand lob) by gender (p<.05). In conclusion, knowledge of activity patterns within competition helps with specific training for th...

Reduction of tablet weight variability by optimizing paddle speed in the forced feeder of a high-speed rotary tablet press

Abstract: Context: Tableting is a complex process due to the large number of process parameters that can be varied. Knowledge and understanding of the influence of these parameters on the final product quality is of great importance for the industry, allowing economic efficiency and parametric release.Objective: The aim of this study was to investigate the influence of paddle speeds and fill depth at different tableting speeds on the weight and weight variability of tablets.Materials and methods: Two excipients possessing different flow behavior, microcrystalline cellulose (MCC) and dibasic calcium phosphate dihydrate (DCP), were selected as model powders. Tablets were manufactured via a high-speed rotary tablet press using design of experiments (DoE). During each experiment also the volume of powder in the forced feeder was measured.Results and discussion: Analysis of the DoE revealed that paddle speeds are of minor importance for tablet weight but significantly affect volume of powder inside the feeder in...

Paddling Force Profiles at Different Stroke Rates in Elite Sprint Kayaking

Abstract: In sprint kayaking the role that paddling technique plays in optimizing paddle forces and resultant kayak kinematics is still unclear. The aim of this study was to analyze the magnitude and shape of the paddle force–time curve at different stroke rates, and their implications for kayak performance. Ten elite kayak paddlers (5 males and 5 females) were analyzed while performing 2000-m on-water trials, at 4 different paces (60, 80, and 100 strokes per minute, and race pace). The paddle and kayak were instrumented with strain gauges and accelerometers, respectively. For both sexes, the force–time curves were characterized at training pace by having a bell shape and at race pace by a first small peak, followed by a small decrease in force and then followed by a main plateau. The force profile, represented by the mean force/peak force ratio, became more rectangular with increasing stroke rate (F[3,40] = 7.87, P < .01). To obtain a rectangular shape to maximize performance, kayak paddlers should seek a stronger...

Controller for a games console

Abstract: The invention provides an improved controller (10) for a games console. The invention is a games controller (10) that is intended to be held by a user in both hands in the same manner as a conventional controller (1). Additionally, the controller of the invention (10) may comprise the same controls (2, 3, 4, 5, 6, 7, 8, 9) as a conventional controller (1). The controller of the present invention (10) is advantageous as it additionally comprises four additional controls (11A, 11B, 11C, 11D) located on the rear of the controller (10) in a position to be operated by the middle fingers of a user (12). The additional controllers (11A, 11B, 11C, 11D) may be paddle levers and may replicate the functions of one or more of the controls (2, 3, 4, 5, 6, 7, 8, 9) located on the front or top of the controller (10).

Paddle-based rotating-shield brachytherapy

Abstract: Purpose: The authors present a novel paddle-based rotating-shield brachytherapy (P-RSBT) method, whose radiation-attenuating shields are formed with a multileaf collimator (MLC), consisting of retractable paddles, to achieve intensity modulation in high-dose-rate brachytherapy. Methods: Five cervical cancer patients using an intrauterine tandem applicator were considered to assess the potential benefit of the P-RSBT method. The P-RSBT source used was a 50 kV electronic brachytherapy source (Xoft Axxent™). The paddles can be retracted independently to form multiple emission windows around the source for radiation delivery. The MLC was assumed to be rotatable. P-RSBT treatment plans were generated using the asymmetric dose–volume optimization with smoothness control method [Liu et al., Med. Phys. 41(11), 111709 (11pp.) (2014)] with a delivery time constraint, different paddle sizes, and different rotation strides. The number of treatment fractions (fx) was assumed to be five. As brachytherapy is delivered as a boost for cervical cancer, the dose distribution for each case includes the dose from external beam radiotherapy as well, which is 45 Gy in 25 fx. The high-risk clinical target volume (HR-CTV) doses were escalated until the minimum dose to the hottest 2 cm3 (D 2cm3 ) of either the rectum, sigmoid colon, or bladder reached their tolerance doses of 75, 75, and 90 Gy3, respectively, expressed as equivalent doses in 2 Gy fractions (EQD2 with α/β = 3 Gy). Results: P-RSBT outperformed the two other RSBT delivery techniques, single-shield RSBT (S-RSBT) and dynamic-shield RSBT (D-RSBT), with a properly selected paddle size. If the paddle size was angled at 60°, the average D 90 increases for the delivery plans by P-RSBT on the five cases, compared to S-RSBT, were 2.2, 8.3, 12.6, 11.9, and 9.1 Gy10, respectively, with delivery times of 10, 15, 20, 25, and 30 min/fx. The increases in HR-CTV D 90, compared to D-RSBT, were 16.6, 12.9, 7.2, 3.7, and 1.7 Gy10, respectively. P-RSBT HR-CTV D 90-values were insensitive to the paddle size for paddles angled at less than 60°. Increasing the paddle angle from 5° to 60° resulted in only a 0.6 Gy10 decrease in HR-CTV D 90 on average for five cases when the delivery times were set to 15 min/fx. The HR-CTV D 90 decreased to 2.5 and 11.9 Gy10 with paddle angles of 90° and 120°, respectively. Conclusions: P-RSBT produces treatment plans that are dosimetrically and temporally superior to those of S-RSBT and D-RSBT, although P-RSBT systems may be more mechanically challenging to develop than S-RSBT or D-RSBT. A P-RSBT implementation with 4–6 shield paddles would be sufficient to outperform S-RSBT and D-RSBT if delivery times are constrained to less than 15 min/fx.

Paddle card assembly for high speed applications

Abstract: A paddle card assembly is disclosed for use in providing a high speed transmission line for connecting electronic devices together. The paddle card takes the form of a circuit board that has two distinct portions, a base portion to which wires of a cable are terminated, and an extension portion that extends rearwardly toward the cable wire in order to extend between sets of wires. The extension portion has one or more ground plane layers formed therewith and supported thereby and as such, the extension portion places a ground plane in the termination area of the connector, rear of the trailing edge of the paddle card to provide shielding between pairs of wires on opposite sides of the paddle card where the cable shields are cut back. The extension portion may have either a reduced thickness, or wire-receiving channels formed therein which accommodate portions of the wires of the cable.

CFD modeling and simulation of a hydropower system in generating clean electricity from water flow

Abstract: In this study, electric generation capacity of a hydropower system was evaluated through computational fluid dynamics (CFD) modeling and simulation. Performance of paddle wheels in producing hydropower out of running water under different speeds was evaluated, and effects of side and bottom fins and paddle wheel shape on power generation were discussed based on the CFD results. It was also found that, compared to the regular straight paddles, the curved paddles can increase the electricity generation capacity of the entire system by 10–20 % at different water speeds. A preliminary economic analysis revealed the great prospects of applying the presented hydropower technology in regions with rich water resource to produce and supply low-cost, clean, and renewable electricity for a large amount of households and industries.

Composite type multi-mode multi-purpose aircraft

Abstract: The invention discloses a composite type multi-mode multi-purpose aircraft, and belongs to the technical field of overall design of aviation flight vehicles. The aircraft comprises a body of a fixed wing aircraft, a driving/autorotation rotor wing system, an expelling aero-engine and a flying control system, wherein the driving/autorotation rotor wing system comprises paddle hubs and paddles; the paddles are hollow, and guide tubes B are communicated with the inner parts of the paddles; an H2O2 catalysis decomposition engine is mounted at the tail end of each paddle; the H2O2 catalysis decomposition engines are connected with the guide tubes; the guide tubes are communicated with guide tubes A; the guide tubes A are connected with an H2O2 storage box. The aircraft disclosed by the invention has the property of vertical/short-distance lifting and suspension, or even can achieve certain back flying and side flying, and can also fly forwards at a high speed; due to adoption of paddle tip air injection driving/autorotation wings, no reaction torque is generated in any mode, and thus a tail rotor as well as a speed reduction transmission and control mechanism of an ordinary helicopter are canceled; the differential thrust for thrusting an aero-engine is adopted to control to achieve steadiness and control in flying direction at a low speed, the waste weight and the energy consumption are reduced, the cost is lowered, the complexity is alleviated, and the flying security in a complex environment is effectively improved.

Modeling of Sewage Sludge Flow in a Continuous Paddle Dryer

Abstract: A model based on the theory of Markov chains has been developed to represent the residence time distribution (RTD) of municipal sewage sludge in a continuous paddle dryer. The flow of dry solids is described by a chain of n perfectly mixed cells, n corresponding to the number of paddles attached to the shaft. The transition probabilities between the cells are governed by two parameters: the parameter of internal recirculation, R, and the solids hold-up, Hu. In the absence of available correlation, both parameters are identified by fitting the model to experimental RTD data. The model demonstrates its ability to describe the sludge flow in a continuous lab-scale paddle dryer. A sensitivity analysis highlights that R is critical for the treatment uniformity while Hu controls the mean residence time and thus the final moisture content.

Portable paddleboard exercise apparatus

Abstract: A portable paddleboard exercise apparatus having a balance platform, an elongated member, a paddle handle, and a number of resistance bands. The apparatus may further include a frame with one or more support members configured to support the balance platform. The balance platform includes an upper surface for a user to balance thereon. The elongated member extends from the balance platform. The resistance bands extend from a distal end of the elongated member to the paddle handle. A user may balance on the balance platform in one of a number of positions while pulling the paddle handle against a resistive force generated by the resistance bands.

Water storage barrel convenient for cleaning interior

Abstract: The invention discloses a water storage barrel convenient for cleaning the interior. A decontamination paddle device is arranged on a water tank body, and comprises a paddle part, a paddle adjustment part and a rotary handle part, wherein the paddle part is formed by a telescopic rod and a cleaning paddle; the cleaning paddle is fixedly connected to the lower end of the telescopic rod; the paddle part is connected with the rotary handle part; a flat guide for the telescopic rod to be in the longitudinal position in the water tank body is arranged on the paddle adjustment part; the paddle adjustment part is movably connected with the upper end face of the water tank body; a dull polish layer is formed on the outer surface of the cleaning paddle; a spraying nozzle is formed on the telescopic rod; a drain outlet is formed in the bottom part of the water tank body. Compared with the prior art, according to the water storage barrel convenient for cleaning the interior, through the pivoting friction of the paddle part in the water tank body, and the cooperation of the spraying nozzle for washing the interior of the water tank body, invisible dirt in the water tank can be effectively removed.

Simple rotor mechanism of coaxial dual-rotor helicopter test stand

Abstract: The invention relates to a simple rotor mechanism of a coaxial dual-rotor helicopter test stand The rotor mechanism comprises an inner shaft, an outer shaft, an actuator group, a lower control system, an upper control system, an upper rotor propeller hub and a lower rotor propeller hub, wherein the upper rotor propeller hub comprises a first propeller hub seat, and a first paddle arm arranged on the first propeller hub seat in a full articulation manner; the lower rotor propeller hub comprises a second propeller hub seat and a second paddle arm arranged on the second propeller hub seat in a full articulation manner; the upper control system is connected with the first paddle arm; the lower control system is connected with the second paddle arm; the upper control system is connected with the lower control system via an intermediate draw bar; and the actuator group is connected with the lower control system to control synchronous motion of the first paddle arm and the second paddle arm The mechanism can achieve collective pitch control and cyclic pitch change of coaxial dual rotors, and effectively achieves various dynamic tests of the helicopter such as upper and lower rotor aerodynamic characteristics of the coaxial dual rotors, dynamic stability of the rotors, and moving part loads of the rotors

Self-adapting scraping and washing device for agitation vat

Abstract: The invention belongs to the technical field of agitators, and particularly relates to a self-adapting scraping and washing device for an agitation vat. The self-adapting scraping and washing device comprises an agitation paddle body. Scraping plates are hinged to the edges, close to the inner wall of the agitation vat, of the agitation paddle body through hinge pins and can rotate around the hinge pins. A limiting device is arranged between each scraping plate and the agitation paddle body, and therefore the angle between each scraping plate and the agitation paddle body is not larger than 180 degrees. A torsion spring is further arranged between each scraping plate and the agitation paddle body, and the angle between each scraping plate and the agitation paddle body is not smaller than 90 degrees and not larger than 180 degrees under the effect of the torsion spring. The self-adapting scraping and washing device is applied to the field of the agitators and effectively solves the problem that the agitation vat is difficult to clean.

High-sensitivity parametrically amplified chemo-mechanical vapor sensors

Abstract: In this paper we present a new kind of high sensitivity chemo-mechanical sensors. These devices consist of a torsional conductive see-saw paddle suspended by two torsional springs from a substrate with symmetric electrodes under each paddle wing. One of the wings is coated with a thin chemically sensitive polymer layer that swells when a specific compound vapor is absorbed. The absorption induced swelling thus causes wing bending and downward deflection proportional to the vapor concentration. Upon application of a fixed DC bias, the deflection is parametrically amplified causing a much larger deflection, and pull-in instability. A sufficiently large amplification results in unstable equilibrium of deflected paddle wing causing it to snap. This amplified drive mechanism does not consume any power, yet it can magnify the observed deflection by one or two orders of magnitude. This deflection is measured through a profilometer as well as a change in capacitance. We present the theory, fabrication and testing results of these sensors.

Variable paddle reaction kettle

Abstract: The utility model discloses a variable paddle reaction kettle which comprises a reaction kettle cylinder, a bracket, a stirring rod, a motor, a plurality of fixed blades and a sliding sleeve, wherein the bracket is mounted on the reaction kettle cylinder; the stirring rod is arranged inside the reaction kettle cylinder; the motor is mounted on the bracket; the plurality of fixed blades are transversely mounted at the bottom of the stirring rod; the sliding sleeve is sleeves the stirring rod in a sliding manner. In initial stirring, because of high viscosity, a driving device is used for driving the sliding sleeve to move upwards to pull moving blades through a pull rod to rotate relative to the fixed blades through a rotating shaft, so that an anchor type stirrer structure is formed, and liquid with relatively high viscosity can be sufficiently and uniformly stirred. After the liquid is stirred for a certain time and the viscosity is reduced, the driving device is used for driving the sliding sleeve to move downwards, and the moving blades are driven by the pull rod to be parallel to the fixed blades, so that a paddle type stirrer structure is formed, a motor rotates to drive the stirring rod to rotate, and the moving blades and the fixed blades are driven to rotate to stir up the liquid. Therefore, due to adoption of a paddle type stirrer, the liquid flows in the axial direction, and the stirring efficiency is improved.

Ward off glass retort

Abstract: The utility model relates to a reaction unit especially relates to a ward off glass retort, including a jar body, cover and agitating unit, the cover is sealed to be set up on the jar body, is provided with the mouth of pipe on the cover. Agitating unit includes the motor and sets up in the transmission shaft of motor output that the transmission shaft passes the mouth of pipe and stretches into a jar body. Agitating unit still includes the frame, and the frame sets up on the cover, and motor and transmission shaft set up in the frame. Still be provided with on the cover and take the speculum hand -hole, jar external surface is provided with outer jacket, is equipped with on jar internal surface and wards off glass glaze layer. Be provided with a plurality of paddles on the transmission shaft, the paddle evenly sets up on the transmission shaft, the paddle including set up the anchor formula paddle of the bottom of transmission shaft with set up in the fan -shaped paddle on transmission shaft upper portion, fan -shaped paddle includes middle axle sleeve and blade, and the blade extends to both sides. Still be provided with the overhead tank on the cover, be provided with the pressure gauge on the overhead tank. Its safe handling can be guaranteed to the retort of this structure.

Game controller with removable paddle accessory

Abstract: A game controller includes a grip, one or more finger-actuatable controls on the grip, and a rim located on the grip. The rim defines an aperture. The game controller further includes a paddle-actuatable sensor accessible through the aperture and a pivot spaced apart from the aperture. The pivot is configured to removably affix a selected paddle accessory to the game controller and to translate a touch applied to the selected paddle accessory outside of the aperture to an actuation of the paddle-actuatable sensor inside the aperture.

Modeling paddle-aided stair-climbing for a mobile robot based on eccentric paddle mechanism

Abstract: To gain high mobility on challenging terrains, a mobile robot based on eccentric paddle mechanism (ePaddle) with locomotion versatility has been proposed. In this paper, a paddle-aided stair-climbing motion is presented for this ePaddle-based robot. The robot can roll on the stair as a traditional wheeled vehicle and also can climb up the stair under the help of its paddles. Robot-stair interaction modes are presented and typical feasible postures of the robot in stair-climbing are discussed. Frictional requirements for the robot to hold a desired posture are evaluated by modelling statics of the robot. Analyzed results reveal that two critical scenarios in wheeled mode occur when the front-wheel is at the bottom of the riser, and when the rear-wheel is at the top of the riser, respectively. In contrast, frictional requirements of the paddle-aided stair-climbing postures confirm that the robot can climb up the stair with all feasible postures by touching the stair with the paddle, which verifies the effectiveness of the proposed paddle-aided stair-climbing.

Effect of Paddle-Wheel Pulsating Velocity on the Hydrodynamic Performance of High-Rate Algal Ponds

Abstract: High-rate algae ponds (HRAPs) are widely used in increasing biofuel production because of their effective design in terms of cost and power consumption. Using modeling and simulation techniques is an economical approach for improving the design of raceways. Previous modeling studies reported the use of a flat velocity profile, thus failing to depict the real phenomena involved. However, in practice, the rotating paddle wheel in HRAPs produces a pulsating velocity that is necessary for culture growth. In this study, the hydrodynamic characteristics of algal ponds were investigated using a coupling algorithm to map the effects of a two-dimensional paddle wheel on a three-dimensional raceway model. HRAPs with and without paddle wheels were compared in terms of hydrodynamic mixing, dead zones, and power consumption. The results revealed that compared with a flat velocity at the inlet, the pulsating velocity of a paddle wheel produced a large dead zone volume with reduced power consumption, shear stres...

Paddle accessory for a game controller

Abstract: A paddle accessory includes a blade, a sensor-activation feature extending from the blade, and a mounting interface spaced apart from the sensor-activation feature. The blade is sized and shaped for manual manipulation by a finger. The mounting interface is configured to selectively mate with a pivot of a game controller to removably affix the paddle accessory to the game controller. The paddle accessory is configured to rotate relative to the pivot to translate a touch force applied to the blade into an actuation force applied by the sensor-activation feature to a paddle-actuatable sensor interior an aperture of the game controller.

A milli-volt triggered MEMS paddle switch

Abstract: This paper presents an implementation of an electrostatic MEMS switch which can be triggered by a very low input voltage in the range of ∼50mV. This device can thus be used as a zero-DC power signal threshold detector suitable for waking up larger battery powered systems. The device consists of an electrically conductive torsional see-saw paddle with four balanced electrodes. The device is symmetrically biased by applying the same voltage at its inner electrodes leading to bistable behavior at flat or collapsed equilibrium positions. The use of elevated symmetric bias softens the springs such that the transition of the paddle state from flat to collapsed can be triggered when a few mV are applied to one of its outer electrode thus causing device snapping in and switch closure.

Permanent-magnet direct-drive wind power generator, system and stator thereof

Abstract: Disclosed are a permanent-magnet direct-drive wind power generator, a system and a stator thereof, wherein the stator comprises a stator bracket (1), a stator iron core (8) arranged on the peripheral wall of the stator bracket and a paddle side tooth pressing plate (6). The paddle side tooth pressing plate is arranged on a paddle side axial end face of the stator iron core. At least one first air hole (2) is formed in the peripheral wall of the stator bracket. At least one second air hole (5) is formed in the paddle side tooth pressing plate. The stator further comprises at least one air flow passage (9) used for linking the first air holes with the second air holes. The air flow passage penetrates through the interior of the stator iron core. The electric motor can self-adaptively dry itself, the service life of permanent magnet poles is prolonged, an "insulation level reduction" of components inside the electric motor is prevented, the risk that the electric motor is corroded by severe air flow is lowered, and insulation reliability is improved.

Study on double-shaft mixing paddle undergoing planetary motion in the laminar flow mixing system

Abstract: This article has studied the impact of double-shaft mixing paddle undergoing planetary motion on laminar flow mixing system using flow field visualization experiment and computational fluid dynamic...

Training paddle for rowing rower

Abstract: The utility model provides a training paddle for a rowing rower and relates to the field of sports training equipment. According to the training paddle, the rower or a trainer can master the training state more effectively in the training process. The training paddle for the rowing rower comprises a paddle body, N pressure sensors, a three-dimensional acceleration sensor and two infrared laser transmitters, wherein N is a positive integral number, the N pressure sensors are evenly and fixedly distributed on the stress surface of a paddle blade, the three-dimensional acceleration sensor is fixed to the other surface of the paddle blade, and the two infrared laser transmitters are fixed to a paddle rod and the bottom of the paddle blade respectively. Infrared laser light transmitted by the two infrared laser transmitters is propagated linearly along the horizontal plane. The handheld part of the paddle rod and the bottom of the paddle blade are each provided with two through holes, and the two through holes in the paddle rod are communicated with the two through holes in the bottom of the paddle blade respectively inside the paddle body. The training paddle is specially applicable to training of the rowing rower.

Torsion diaphragm apparatus

Abstract: A diaphragm assembly disposed in a receiver and includes a support structure. The support structure is generally rectangular and has a length that extends along a longitudinal axis. The support structure has a width that is generally perpendicular to the longitudinal axis. The length is greater than the width. The assembly includes a paddle and a membrane, and the membrane extends over and being supported by the support structure and paddle. A gap is disposed between the paddle and the support structure. A plurality of tabs extend across the gap and connecting the paddle and support structure. The tabs are located along the length of the support structure and extend outward from the longitudinal axis across the gap. The tabs move in a twisting motion and not bending motion as the paddle moves.

Low force actuation dispenser paddle for a dispenser assembly of an appliance

Abstract: A dispensing mechanism for an appliance includes an operable paddle having a lower portion and an upper portion pivotally attached to a dispenser wall between outward and inward positions. An actuator has a switch positioned proximate a pivot defined by a first end of an actuator lever. A second end of the actuator lever is positioned proximate the lower portion of the operable paddle, wherein operation of the operable paddle to the inward position engages the lower portion of the operable paddle with the bottom portion of the actuator lever and operates the actuator lever from an idle state to a use state. Movement of the bottom portion of the actuator lever operates the switch from a deactivated state to an activated state, wherein the activated state of the switch activates the at least one of the ice dispenser and the water dispenser.

Flat-paddle drying machine and flat-paddle drying method

Abstract: The invention relates to a flat-paddle drying machine and a flat-paddle drying method so as to dry materials. The drying machine is characterized by comprising a drive unit, a cylinder, a stirring unit and a de-dusting unit. The stirring unit is supported in the cylinder in a free rotary mode and is coupled with and driven by the drive unit. The stirring unit comprises a stirring shaft and a plurality of straight paddles distributed on a rotation shaft. An inclined angle is formed between the straight paddles and the axis of the rotation shaft. A sleeve heating unit is arranged on the outer side of the cylinder which comprises a material inlet, a material outlet, a hot air inlet and a hot air outlet. The hot air inlet and the material outlet are disposed at one end of the cylinder, and the hot air outlet and the material inlet are disposed at the other end of the cylinder. The de-dusting unit is connected with the hot air outlet.