scholarly journals Evaluating Alternative Seed-Cotton Reclaimers for High-Speed Roller Ginning

2020 ◽  
Vol 36 (3) ◽  
pp. 245-256
Author(s):  
Carlos B. Armijo ◽  
Derek P. Whitelock ◽  
Paul A. Funk ◽  
Joe W. Thomas
Keyword(s):  
Upland Cotton ◽  
High Speed ◽  
High Capacity ◽  
Seed Storage ◽  
List Type ◽  
Seed Cotton ◽  
Seed Loss ◽  
Pima Cotton ◽  
Full Speed ◽  
In Series

HighlightsExperimental high-capacity seed-cotton reclaimers were evaluated for the growing high-speed roller-ginning industry.The experimental reclaimers minimized the amount of seed-cotton loss compared to the conventional reclaimer, but had more seed loss than a conventional reclaimer.The conventional reclaimer had the lowest combined seed and lint loss when processing Pima cotton.An experimental reclaimer based on a current cotton gin machine had seed and lint losses nearly $10 per cotton bale less than the conventional reclaimer when processing Upland cotton.Abstract. In a roller ginnery, a reclaimer machine removes partially-ginned or unginned seed cotton (carryover) from the mixture of carryover and ginned cottonseed that is expelled from the roller-gin stand during operation and returns the carryover to the gin stand for re-ginning. Conventional seed-cotton reclaimers are marginally adequate in their capacity to handle the increased carryover that high-speed roller ginning produces. Overloading a reclaimer often leads to choke-ups and downtime for the ginnery. The objective of this study was to develop and test high-capacity reclaimers. A modified 3-saw cylinder stick machine and a modified 2-saw cylinder gin-stand feeder were tested and compared to a conventional reclaimer. The saw-cylinders in the modified machines were operated at standard full speed, 1/2 of full speed, and 3/4 of full speed. Both Pima and Upland cotton were included in this study because there is a sizable amount of roller-ginned Upland cotton. Results showed that the experimental reclaimers reclaimed more carryover than the conventional reclaimer. An effective reclaimer will 1) reclaim carryover without also capturing residual seed that will likely be removed with cotton trash when returned to the gin stand feeder (seed loss) and 2) allow seed to pass through to the seed storage while minimizing the amount of residual carryover that escapes with the seed (carryover loss). The experimental reclaimers minimized the amount of residual carryover loss, but they had more residual seed loss than the conventional reclaimer. Increasing the saw-cylinder speeds of the experimental reclaimers decreased the residual seed loss but increased the residual carryover loss. Estimates of the value of the lost seed and of the lint on the lost carryover revealed that the conventional reclaimer had the lowest combined loss of $3.56 per bale when processing Pima cotton and the experimental 2-saw feeder with saw-cylinders operating at full speed had the lowest combined loss of $6.89 per bale when processing Upland cotton. The results suggest that losses of lint and seed may be further reduced by using a combination in series of different types of reclaimers to take advantage of each of their respective best features. Keywords: Cotton ginning, Roller ginning, Seed-cotton reclaimer.

scholarly journals Prototype Design and Experimental Evaluation of Autonomous Collaborative Communication System for Emerging Maritime Use Cases

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3871
Author(s):  
Jiri Pokorny ◽  
Khanh Ma ◽  
Salwa Saafi ◽  
Jakub Frolka ◽  
Jose Villa ◽  
...  
Keyword(s):  
Communication System ◽  
Autonomous Vehicles ◽  
High Speed ◽  
High Capacity ◽  
Workplace Safety ◽  
Unmanned Vehicles ◽  
Use Cases ◽  
Automated Systems ◽  
Collaborative Communication ◽  
Wide Range

Automated systems have been seamlessly integrated into several industries as part of their industrial automation processes. Employing automated systems, such as autonomous vehicles, allows industries to increase productivity, benefit from a wide range of technologies and capabilities, and improve workplace safety. So far, most of the existing systems consider utilizing one type of autonomous vehicle. In this work, we propose a collaboration of different types of unmanned vehicles in maritime offshore scenarios. Providing high capacity, extended coverage, and better quality of services, autonomous collaborative systems can enable emerging maritime use cases, such as remote monitoring and navigation assistance. Motivated by these potential benefits, we propose the deployment of an Unmanned Surface Vehicle (USV) and an Unmanned Aerial Vehicle (UAV) in an autonomous collaborative communication system. Specifically, we design high-speed, directional communication links between a terrestrial control station and the two unmanned vehicles. Using measurement and simulation results, we evaluate the performance of the designed links in different communication scenarios and we show the benefits of employing multiple autonomous vehicles in the proposed communication system.

scholarly journals The effect of including the Nordic Hamstring exercise on sprint and jump performance in athletes: protocol of a systematic review and meta-analyses

2020 ◽  
Author(s):  
Kasper Krommes ◽  
Mathias F. Nielsen ◽  
Laura Krohn ◽  
Birk M. Grønfeldt ◽  
Kristian Thorborg ◽  
...  
Keyword(s):  
Systematic Review ◽  
High Speed ◽  
Data Extraction ◽  
Force Production ◽  
List Type ◽  
Jump Performance ◽  
Production Studies ◽  
Hamstring Strain ◽  
Data Extraction Form ◽  
Meta Analyses

AbstractThe Nordic Hamstring exercise reduces hamstring strain injuries in football and other sports, but the exercise is not well adopted in practice. Barriers from practitioners include fear of performance decrements, due to lack of specificity of the exercise with high speed running. However, in theory, increased eccentric hamstring strength could transfer to faster sprinting due to higher horizontal force production. Studies on the effect of the Nordic Hamstring exercise on performance have been conflicting and no synthesis of the evidence exists. We therefore pose the following question: does including the Nordic Hamstring exercise hamper sprint or jump performance in athletes? We will answer this question by performing a systematic review of the literature, critically appraise relevant studies, and GRADE the evidence across key outcomes and perform meta-analyses, meta-regression and subgroup analyses. In this protocol we outline the planned methods and procedures.Progress reportBesides this protocol, our data extraction form and the process of data extraction has been piloted on 3 relevant studies, along with familiarization with the Risk of Bias 2.0 tool. We have also comprised a preliminary search strategy for PubMed.Supplementary filesData Extraction Form (.pdf)Populated PRISMA-P checklist (.pdf)

scholarly journals Preliminaries on the Accurate Estimation of the Hurst Exponent Using Time Series

2021 ◽  
Author(s):  
Ginno Millán ◽  
Román Osorio-Comparán ◽  
Gastón Lefranc
Keyword(s):  
Time Series ◽  
Hurst Exponent ◽  
High Speed ◽  
Mean Squared Error ◽  
Computer Network ◽  
Accurate Estimation ◽  
Minimum Length ◽  
Squared Error ◽  
In Series ◽  
Speed Computer

<div>This article explores the required amount of time series points from a high-speed computer network to accurately estimate the Hurst exponent. The methodology consists in designing an experiment using estimators that are applied to time series addresses resulting from the capture of high-speed network traffic, followed by addressing the minimum amount of point required to obtain in accurate estimates of the Hurst exponent. The methodology addresses the exhaustive analysis of the Hurst exponent considering bias behaviour, standard deviation, and Mean Squared Error using fractional Gaussian noise signals with stationary increases. Our results show that the Whittle estimator successfully estimates the Hurst exponent in series with few</div><div>points. Based on the results obtained, a minimum length for the time series is empirically proposed. Finally, to validate the results, the methodology is applied to real traffic captures in a high-speed computer network.</div>

scholarly journals Diagnosis of primary ciliary dyskinesia: summary of the ERS Task Force report

Breathe ◽  
2017 ◽  
Vol 13 (3) ◽  
pp. 166-178 ◽  
Author(s):  
Claudia E. Kuehni ◽  
Jane S. Lucas
Keyword(s):  
Secondary Care ◽  
Primary Ciliary Dyskinesia ◽  
High Speed ◽  
Task Force ◽  
Diagnostic Testing ◽  
List Type ◽  
European Respiratory Society ◽  
Term Infants ◽  
Task Force Report ◽  
Ciliary Dyskinesia

Key pointsPrimary ciliary dyskinesia (PCD) is a genetically and clinically heterogeneous disease characterised by abnormal motile ciliary function.There is no “gold standard” diagnostic test for PCD.The European Respiratory Society (ERS) Task Force Guidelines for diagnosing PCD recommend that patients should be referred for diagnostic testing if they have several of the following features: persistent wet cough; situs anomalies; congenital cardiac defects; persistent rhinitis; chronic middle ear disease with or without hearing loss; or a history, in term infants, of neonatal upper and lower respiratory symptoms or neonatal intensive care admission.The ERS Task Force recommends that patients should be investigated in a specialist PCD centre with access to a range of complementary tests: nasal nitric oxide, high-speed video microscopy analysis and transmission electron microscopy. Additional tests including immunofluorescence labelling of ciliary proteins and genetic testing may also help determine the diagnosis.Educational aimsThis article is intended for primary and secondary care physicians interested in primary ciliary dyskinesia (PCD), i.e. those who identify patients for testing, and those involved in diagnosing and managing PCD patients. It aims: to inform readers about the new European Respiratory Society Task Force Guidelines for diagnosing patients with PCDto enable primary and secondary care physicians to: identify patients who need diagnostic testing; understand the diagnostic tests that their patients will undergo, the results of the tests and their limitations; and ensure that appropriate care is subsequently delivered.

Remote Monitoring and Failure Diagnosis for a Microturbine Cogeneration System

2007 ◽  
Author(s):  
Tadashi Kataoka ◽  
Tadahiko Kishikawa ◽  
Shigeru Sakata ◽  
Takahiro Nakagawa ◽  
Jun Ishiguro
Keyword(s):  
Remote Monitoring ◽  
High Speed ◽  
High Capacity ◽  
Failure Detection ◽  
Failure Diagnosis ◽  
Remote Monitoring System ◽  
Cogeneration System ◽  
Trend Data ◽  
High Speed Data Acquisition ◽  
Detection And Diagnosis

This paper presents the implementation of failure detection and diagnosis, and predictive maintenance for a microturbine cogeneration system. It also introduces a remote monitoring system with capabilities for high-capacity high-speed data acquisition and storage, as well as data sharing via the Internet. Additionally, this paper provides failure diagnosis that uses high-speed transient data in order to determine the root cause of microturbine emergency shutdown or start failure, as well as failure prediction that uses long-range trend data in order to carry out the appropriate maintenance with some examples.

The Development of Turboexpander-Generators for Gas Pressure Letdown Part I: Design and Analysis

2021 ◽  
Author(s):  
Rasish Khatri ◽  
Jeremy Liu ◽  
Freddie Sarhan ◽  
Ovais Najeeb ◽  
Hiroshi Kajita ◽  
...  
Keyword(s):  
High Speed ◽  
Field Testing ◽  
Magnetic Bearing ◽  
Gas Pressure ◽  
Loop Dynamics ◽  
Full Speed ◽  
Detailed Simulation ◽  
Bearing Design ◽  
Net Load

Abstract This paper describes the design and development of an innovative 280 kW and a 125 kW Turboexpander Generator (TEG) for natural gas pressure letdown (PLD) applications. The flange-to-flange TEG is supported by active magnetic bearings (AMB) and uses an advanced thrust balancing scheme to minimize the net load on the thrust bearing. The machine designs for the two TEG frame sizes are very similar to maintain commonality between parts. A review of the high-speed generator (HSG) and AMB design is provided. A complete AMB closed-loop dynamics study is presented, including a comprehensive rotordynamics and controls analysis. The touchdown bearing design is shown and discussed, and design details of the touchdown bearing resilient mount are presented. The touchdown bearings are given resilience with a tolerance ring. A detailed simulation of a rotor touchdown event at full speed is shown. The magnetic bearing controller (MBC) and variable speed drive (VSD) are located approximately 35 m from the TEG, exposed to the outside environment, and are not required to be explosion-proof. The prototype TEGs are intended to be manufactured and tested in Q1 2021. They will be commissioned, and field tested in Q2 2021. A follow-up paper detailing the mechanical testing and field testing of the units will follow in 2022.

Needle Fatigue Analysis for High-Speed Knitting Machines

1995 ◽  
Author(s):  
Richard H. Lyon ◽  
Leonid M. Malinin
Keyword(s):  
High Speed ◽  
Transfer Functions ◽  
High Capacity ◽  
Time History ◽  
Stationary Problem ◽  
Element Analysis ◽  
Speed Increase ◽  
Design Engineers ◽  
Machine Element ◽  
Needle Longevity

Abstract In modern, high capacity circular knitting machines, the small and fragile latch needles are often a performance-limiting machine element (Schuler, 1980). For these machines, the operating circumferential speed may exceed 1.5 m/sec. Due to the kinematics of the process, the cam driven needles are exposed to periodic excitation with frequency proportional to the speed. Increase in rotational speed gives rise to needle head fatigue breakages unless special design measures are undertaken. Frequencies up to 15 kHz have been observed and up to 60 kHz may be expected in the vibration spectrum. To understand what particular features of needle design may be responsible for their longevity, several techniques were developed to apply Finite Element Analysis software to estimating the fatigue life under a non-harmonic periodic loading. The known FEA packages handle dynamics of a system with such loading as a general non-stationary problem, whereas much more efficient solution can be constructed by combining the analytical solution for a one DOF system under recurring impulses (5-functions of amplitude A) at the moments 0, T, 2T, …, and the natural modes of the system (with the driving point fixed) provided by FEA. As applied to the system in question, from the broad frequency range of the excitation forces and displacements, only frequencies close to those providing maxima to the transfer functions from the driving point to the head of the needle were selected. These frequencies are referred to further on as the response frequencies. Then the time history simulating polyharmonic stresses in the dangerous area was generated and processed according to the chosen fatigue criteria (a corrected linear hypothesis of damage summation, see below). Thus for any given node of the needle a point on the S-N diagram was obtained. A wide spread desktop package, ALGOR, was selected as a Linear Stress Analysis solver. The described procedure is built on top of this package and allows design engineers to make judgements as to what design is more advantageous for needle longevity.

Seed Cotton Yield and Fibre Properties of F1 and F2 Hybrids of Upland Cotton

2001 ◽  
Vol 1 (1) ◽  
pp. 48-50
Author(s):  
Mohammad Jurial Balo . ◽  
Abdul Rahim Lakho . ◽  
Hidayatullah Butto . ◽  
Rehmatullah Rind .
Keyword(s):  
Upland Cotton ◽  
Cotton Yield ◽  
Seed Cotton ◽  
Fibre Properties ◽  
Seed Cotton Yield ◽  
F2 Hybrids
Sign in / Sign up

Export Citation Format

Share Document