Dual Mechanical Environment Simulations on Liquid Reserve Batteries

2010 ◽  
Vol 29-32 ◽  
pp. 1414-1419
Author(s):  
Bin Wu ◽  
De Dong Huang ◽  
Sheng Xi
Keyword(s):  
High Speed ◽  
Mechanical Environment ◽  
Wooden Block ◽  
Recoil Force ◽  
Vehicle Impact ◽  
Impulse Duration ◽  
Vehicle Acceleration ◽  
Simulator Design ◽  
Time Required ◽  
Liquid Reserve

Dual mechanical environment simulators are usually used to supply recoil force and centrifugal force for simulation of liquid reserve batteries during artillery projection. When the vehicle with fuze batteries impacts the wooden block rotating with high speed, whether the transient impact parameters and the time required for the vehicle reaching the rated revolution are in accordance with the test conditions of fuze batteries is one of the key technologies. Finite element simulations are implemented for the transient vehicle impact process, the variation of vehicle acceleration under different projection velocities, the variations of vehicle acceleration and impulse duration with different wooden block thicknesses, and the time required to achieve stable rotational speed are discussed in this paper, which can be a reference for the simulator design.

scholarly journals The effect of a lack of uncapped brood on social interactions between honey bee workers and the queen

Apidologie ◽  
2021 ◽  
Author(s):  
Sylwia Łopuch ◽  
Adam Tofilski
Keyword(s):  
Social Interactions ◽  
Honey Bee ◽  
Honey Bees ◽  
High Speed ◽  
Egg Production ◽  
Social Contexts ◽  
The Other ◽  
High Speed Camera ◽  
Time Required ◽  
Honey Bee Workers

AbstractVibro-acoustic communication is used by honey bees in many different social contexts. Our previous research showed that workers interact with their queen outside of the swarming period by means of wing-beating behaviour. Therefore, the aim of this study was to verify the hypothesis that the wing-beating behaviour of workers attending the queen stimulates her to lay eggs. The behaviour of workers and the queen was recorded using a high-speed camera, at first in the presence of uncapped brood in the nest and then without one. None of the queens performed wing-beating behaviour. On the other hand, the workers attending the queen demonstrated this behaviour two times per minute, on average, even in the presence of uncapped brood in the nest. After removing the combs with the uncapped brood, the incidence of wing-beating behaviour increased significantly to an average of four times per minute. Wing-beating behaviour did not differ significantly in its characteristics when uncapped brood was present or absent in the nest. During 3 days after removing the combs with the uncapped brood, there was no significant increase in the rate of egg lying by the queen. Therefore, the results presented here do not convincingly confirm that the wing-beating behaviour of workers affects the rate of queen's egg-lying. This negative result can be related to colony disturbance and longer time required by the queen to increase egg production.

scholarly journals Forensic Engineering Analysis Of Bicycle Versus Pickup Collision

2010 ◽  
Vol 27 (1) ◽  
Author(s):  
Jerry S. Ogden
Keyword(s):  
High Speed ◽  
Engineering Analysis ◽  
Test Procedures ◽  
Data Set ◽  
Vehicle To Vehicle ◽  
Vehicle Collision ◽  
Vehicle Impact ◽  
General Test ◽  
Forensic Engineering ◽  
A Minor

The Forensic Engineering Analysis Of Bicycle-Vehicle Incidents Presents Its Own Unique Set Of Challenges. Often, The Forensic Engineer Is Faced With A Limited Data Set For Determining Vehicle Impact Speed From The Physical Evidence Produced By A Bicycle Collision With An Automobile, Which May Not Be Of Issue For A Vehicle-To-Vehicle Collision At Similar Speeds. This Paper Analyzes A Collision Between A Light Duty Pickup Pulling A Tandem Axle Utility Trailer And A Bicycle Ridden By A Minor Child. There Were Allegations That The Pickup Was Traveling At A High Speed Above The Speed Limit, As Well As Passing Another Vehicle At The Time Of The Incident. In Order To Accurately And Dependably Determine The Speed Of The Ford F350 Pickup Involved In This Incident Event, This Forensic Engineer Elected To Recreate The Vehicle Locked Wheel Skidding Evidence That Was Produced During The Incident Event And Photographically Recorded By Police Investigators. The Dynamic Skid Testing Technique, Test Equipment, And General Test Procedures Used To Accurately Determine Vehicle Speeds For This Incident Event, And How It Can Be Applied To Similar Collision Events Are Discussed In This Paper

Interdisciplinary study on pottery experimentally impregnated with wine

2014 ◽  
Vol 68 (8) ◽  
Author(s):  
Eugenia Teodor ◽  
Georgiana Badea ◽  
Andreia Alecu ◽  
Larisa Calu ◽  
Gabriel Radu
Keyword(s):  
Capillary Electrophoresis ◽  
Lactic Acid ◽  
Tartaric Acid ◽  
Malic Acid ◽  
High Speed ◽  
White Wine ◽  
Good Resolution ◽  
Fine Grained ◽  
Electrophoresis Method ◽  
Time Required

AbstractExperimentally developed ceramic pots, with two different sizes of grain, were half-filled with wine and subjected to thermal alteration at constant elevated temperature ((60 ± 2)°C) in darkness for 12 weeks. This work sought to characterise the samples thereby obtained from chemical and mineralogical perspectives using scanning electron microscopy and an energy-dispersive X-ray microanalysis system (SEM-EDX), Fourier transform infrared spectroscopy (FTIR) and capillary electrophoresis (CE) with UV detection as an alternative to chromatographic methods, due to its good resolution, automation, simplicity, high speed, low consumption of chemicals and short time required for sample preparation. The capillary electrophoresis method was used for the detection of five wine biomarkers: succinic acid, malic acid, tartaric acid, citric acid and lactic acid. In general, it was noted that the fine-grained ceramic assortment retained the organic material better than the coarser-grained ceramics. An interesting observation derived from this study was that not only could tartaric acid be considered as a biomarker for wine residues in archaeological pottery, but malic acid could also act similarly for white wine and lactic acid for red wine.

A Remote Operating Slit Lamp Microscope System

2011 ◽  
Vol 50 (05) ◽  
pp. 427-434 ◽  
Author(s):  
N. Tanabe ◽  
K. Go ◽  
Y. Sakurada ◽  
M. Imasawa ◽  
F. Mabuchi ◽  
...  
Keyword(s):  
High Speed ◽  
Slit Lamp ◽  
Ocular Diseases ◽  
Diagnostic Ability ◽  
The Core ◽  
Examination Time ◽  
Loading System ◽  
High Consistency ◽  
Time Required ◽  
Completion Times

SummaryObjectives: To develop a remote-operating slit lamp microscope system (the remote slit lamp) as the core for highly specialized ophthalmology diagnoses, and to compare the utility of this system with the conventional slit lamp microscope system (the conventional slit lamp) in making a diagnosis.Methods: The remote slit lamp system was developed. Three factors were evaluated in comparison to the conventional slit lamp. The ability to acquire skills was investigated using a task loading system among specialists and residents in ophthalmology. Participants repeated a task up to ten times and the time required for each task was analyzed. The consistency of the two systems in making a diagnosis was investigated using eyes of patients with ocular diseases as well as healthy volunteers.Results: The remote slit lamp is composed of a patient’s unit and ophthalmologist’s unit connected by high-speed internet. The two units share images acquired by the slit lamp in addition to the images and voices of patients and ophthalmologists. Both ophthalmology specialists and residents could minimize the completion times after several trials. The remote slit lamp took more time than the conventional slit lamp. Both systems showed a high consistency in evaluations among eyes with healthy eyes or those with ocular diseases.Conclusions: The remote slit lamp has a similar diagnostic ability, but required more examination time in comparison to the conventional slit lamp. The currently developed remote slit lamp has the potential to be employed for telemedicine purposes in the field of ophthalmology.

Toolpath Generation Method Based on Control Characteristics of Machine Tool for High-Speed and High-Accuracy Machining

2012 ◽  
Vol 6 (6) ◽  
pp. 697-703 ◽  
Author(s):  
Kosuke Saito ◽  
◽  
Hideki Aoyama ◽  
Noriaki Sano ◽  
Keyword(s):  
Machine Tool ◽  
Surface Quality ◽  
High Speed ◽  
Linear Interpolation ◽  
Machining Accuracy ◽  
Drive Control ◽  
Interpolation Problems ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Time Required

Drive control of NC machine tools is based on linear interpolation. When curved surfaces are machined using linear interpolation, problems arise with the feedrate not reaching the command feedrate, machining accuracy and surface quality decreasing, etc. In order to solve such problems, a method for generating a toolpath based on the control characteristics of a machine tool is proposed. The effectiveness of the proposed method is confirmed through simulations and experiments. It is found that the proposed method can reduce the cutting time to approximately 50% of the time required when conventional CAM systems are used. The proposed method also improves surface quality.

Access Spacing Based on Turning-Vehicle Acceleration

2017 ◽  
Vol 2618 (1) ◽  
pp. 1-7
Author(s):  
James L. Gattis ◽  
Justin R. Chimka ◽  
Andrew Evans
Keyword(s):  
Small Study ◽  
Access Management ◽  
Left Turn ◽  
The Core ◽  
Different Types ◽  
Vehicle Acceleration ◽  
Time Required ◽  
Vehicle Movement ◽  
Suburban Environment

Spacing between access connections—whether between a public roadway and a driveway or between two successive driveways—is one of the core techniques employed to effect access management. Several rationales reflecting different types of traffic interactions have been developed as a basis for minimum spacing distances. A small study was done in which two attributes were recorded: positions of vehicles turning from a side street and accelerating along the through roadway and time required for vehicles to turn left from the through roadway into a driveway. The vehicle movement described—a vehicle turning right from the side street into the through roadway—may be more likely to surprise the driver contemplating a left turn from the through roadway. Information derived from these observations, combined with perception–reaction values found in the literature, offers a basis for minimum spacing criteria that addresses one of many types of traffic interactions related to spacing, where a left turn is allowed across the through roadway downstream of another connection. These findings provide one more means to assess spacing along four-lane arterials in a developed suburban environment. A study with a greater scope to expand these findings is also proposed.

scholarly journals Hybrid MVDR-LMS beamforming for Massive MIMO

2019 ◽  
Vol 16 (2) ◽  
pp. 715
Author(s):  
Yasmine M. Tabra ◽  
Bayan Sabbar
Keyword(s):  
Massive Mimo ◽  
High Speed ◽  
Lms Algorithm ◽  
Mean Square ◽  
Least Mean Square ◽  
Training Time ◽  
Multiple Users ◽  
Multiple Beams ◽  
Time Required ◽  
Beamforming Algorithm

<p>With the high speed of communication in LTE-5G, fast beamforming techniques need to be adopted. The training time required to form and steer the main lobes toward 5G multiple users must be short. Least-Mean-Square (LMS) training time is not suitable to work with in LTE-5G, but it has a good performance in forming multiple beams to large number of users and producing nulls in the interference direction. In this paper, an optimized hybrid MVDR-LMS beamforming algorithm is proposed to reduce the time required to estimate the antenna’s weights. This optimization is made by the benefit of previously set weights calculated using MVDR algorithms. The performance of the proposed hybrid MVDR-LMS algorithm tested using MATLAB 2016a.</p>

Vision System for an Autonomous Underwater Vehicle with a Benthos Sampling Function

2018 ◽  
Vol 30 (2) ◽  
pp. 248-256 ◽  
Author(s):  
Shinsuke Yasukawa ◽  
Jonghyun Ahn ◽  
Yuya Nishida ◽  
Takashi Sonoda ◽  
Kazuo Ishii ◽  
...  
Keyword(s):  
High Speed ◽  
Autonomous Underwater Vehicle ◽  
Vision System ◽  
Image Acquisition ◽  
Underwater Vehicle ◽  
Sampling Function ◽  
Software Modules ◽  
Preparation Mode ◽  
Time Required ◽  
Mode Tm

We developed a vision system for an autonomous underwater robot with a benthos sampling function, specifically sampling-autonomous underwater vehicle (AUV). The sampling-AUV includes the following five modes: preparation mode (PM), observation mode (OM), return mode (RM), tracking mode (TM), and sampling mode (SM). To accomplish the mission objective, the proposed vision system comprises software modules for image acquisition, image enhancement, object detection, image selection, and object tracking. The camera in the proposed system acquires images in intervals of five seconds during OM and RM, and in intervals of one second during TM. The system completes all processing stages in the time required for image acquisition by employing high-speed algorithms. We verified the effective operation of the proposed system in a pool.

A Discussion on recent research in air pollution - Developments in air pollution measurement

1969 ◽  
Vol 265 (1161) ◽  
pp. 143-151 ◽  
Keyword(s):  
Air Pollution ◽  
Particle Size ◽  
High Speed ◽  
Dust Emission ◽  
Dust Concentration ◽  
Full Effect ◽  
Pollution Measurement ◽  
Averaging Time ◽  
Time Required ◽  
Dust Monitor

The behaviour of plumes from tall chimneys is now fairly well understood. To achieve this understanding it has been necessary to develop high speed recording devices for sulphur dioxide concentration and plume height and to use recorders of atmospheric turbulence and temperature profile at heights up to some hundreds of metres. Instruments for pollution control, in particular the control of dust, have a different requirement. They must be simple; and in addition must measure meaningful functions of the basic variables rather than a single variable. A dust gauge has been developed which measures in the field a function of dust concentration, dust velocity and particle size, and is also dependent on wind direction. The function is considered to represent the ‘ nuisance value ’ of the dust emission. A dust monitor has been developed which measures, before emission, the same function of the dust variables, and can be used for emission control. It supplements the smoke meter type of instrument which measures a different function of dust concentration and particle size. The zero stability of both instrument types has been studied and improved. The averaging time of a measurement is an important conception both in the investigation and the control of pollution. In monitoring instruments it must be related to the | integrating time ’ of each type of complaint. This is the time required for a pollutant to produce its full effect from an arbitrary starting time.

Physics of Fresh Produce Safety: Role of Diffusion and Tissue Reaction in Sanitization of Leafy Green Vegetables with Liquid and Gaseous Ozone-Based Sanitizers

2015 ◽  
Vol 78 (12) ◽  
pp. 2108-2116 ◽  
Author(s):  
MYKOLA V. SHYNKARYK ◽  
TARAS PYATKOVSKYY ◽  
HUSSEIN M. MOHAMED ◽  
AHMED E. YOUSEF ◽  
SUDHIR K. SASTRY
Keyword(s):  
High Speed ◽  
Fresh Produce ◽  
Tissue Reaction ◽  
Transport Processes ◽  
Wash Water ◽  
Produce Safety ◽  
Ozone Concentrations ◽  
Washing Process ◽  
Time Required ◽  
K 12

Produce safety has received much recent attention, with the emphasis being largely on discovery of how microbes invade produce. However, the sanitization operation deserves more attention than it has received. The ability of a sanitizer to reach the site of pathogens is a fundamental prerequisite for efficacy. This work addresses the transport processes of ozone (gaseous and liquid) sanitizer for decontamination of leafy greens. The liquid sanitizer was ineffective against Escherichia coli K-12 in situations where air bubbles may be trapped within cavities. A model was developed for diffusion of sanitizer into the interior of produce. The reaction rate of ozone with the surface of a lettuce leaf was determined experimentally and was used in a numerical simulation to evaluate ozone concentrations within the produce and to determine the time required to reach different locations. For aqueous ozone, the penetration depth was limited to several millimeters by ozone self-decomposition due to the significant time required for diffusion. In contrast, gaseous sanitizer was able to reach a depth of 100 mm in several minutes without depletion in the absence of reaction with surfaces. However, when the ozone gas reacted with the produce surface, gas concentration was significantly affected. Simulation data were validated experimentally by measuring ozone concentrations at the bottom of a cylinder made of lettuce leaf. The microbiological test confirmed the relationship between ozone transport, its self-decomposition, reaction with surrounding materials, and the degree of inactivation of E. coli K-12. Our study shows that decontamination of fresh produce, through direct contact with the sanitizer, is more feasible with gaseous than with aqueous sanitizers. Therefore, sanitization during a high-speed washing process is effective only for decontaminating the wash water.

Sign in / Sign up

Export Citation Format

Share Document