scholarly journals Effectiveness and Optimization of Harbour Tug Fleet

2018 ◽  
Vol 19 (2) ◽  
pp. 140-150
Author(s):  
Oleksandr Bondarenko ◽  
Valery Nekrasov ◽  
Oleksii Yastreba
Keyword(s):  
Low Cost ◽  
Random Variables ◽  
Weather Conditions ◽  
Time Interval ◽  
Fleet Composition ◽  
Conditional Time ◽  
Economic Indexes ◽  
One Year ◽  
Selection Of

Abstract Determination of efficiency and optimization harbour tug fleet is based on simulation of fleet work and usage for this the methods of ship dynamics and probability theory. Visiting the port transport vessels of possible types is considered as random stream of given intensity. This stream is distributed over the berths. Productivities of berths are given random variables. Random variables are also characteristics of weather conditions in the harbour basin. Tug fleet is represented by the collection of existing port tugs of different types. Work of tugs is determined by operations of approaching to ships, escorting theirs in the near-port waters, posting on the approach channels, transportation within the port waters, berthing, unberthing and going out the ship from the port with the repetition of functioning operations in reverse order. Selection of tugs to service the next arriving or departing ship is dependent from the intensity of the current weather conditions in the port and busyness of tugs in operations with other ships. Work fleet is considered on the conditional time interval of one year. In this time the efficiency of the tug fleet is defined by economic indexes of fulfilment of all towing operations and operations on maintenance tugs. Optimization of the fleet composition is carried out according to the criteria required minimum total bollard pull, low cost and high profit. Based on performed research a program for calculating the efficiency and optimization of the port towing fleet is composed. The program can be adapted to any port with whatever types of tugs.

One-Year Evaluation of a 20 MW Photovoltaic Power Station

2013 ◽  
Vol 805-806 ◽  
pp. 143-148
Author(s):  
Li Ying Xie ◽  
Yun Lin Sun ◽  
Rui Jiang Hong
Keyword(s):  
Low Cost ◽  
Weather Conditions ◽  
Photovoltaic System ◽  
Test Field ◽  
Power Demand ◽  
Power Station ◽  
High Quality ◽  
Partial Shading ◽  
Photovoltaic Power ◽  
One Year

Grid-connected PV power station is one of the most important applications of photovoltaic system, generating low cost and high-quality electric power without non-renewable energy, as well as relaxing the tightness of daytime power demand. In China, it is usually installed on remote open area for low cost to guarantee the abundant solar power. However, this kind of place usually comes with tough weather conditions. In this paper, the property of the PV test field is estimated by its output characteristic. One inevitable and two avoidable reasons which affect the plant output are proposed. Firstly, the inevitable factor is weather, and the assessment analyzing the performance of PV power system under different weather conditions, such as sunny, cloudy, rainy and snowy is then presented. Secondly, losses owing to the mounting type and partial shading, which can be reduced by well designing and installing, are also mentioned and analyzed.

Variable selection for the determination of total polar materials in fried oils by near infrared spectroscopy

2018 ◽  
Vol 27 (2) ◽  
pp. 107-114 ◽  
Author(s):  
Mari M Cascant ◽  
Salvador Garrigues ◽  
Miguel de la Guardia
Keyword(s):  
Variable Selection ◽  
Near Infrared ◽  
Low Cost ◽  
Oil Quality ◽  
Analytical Techniques ◽  
Coefficient Of Determination ◽  
Prediction Errors ◽  
Polar Materials ◽  
Selection Of

Total polar materials (TPM) content is considered as the best indicator and the most common parameter to check the quality of deep-frying oils. The development of simpler and quicker analytical techniques than the available methods to monitor oil quality in restaurants and fried food outlets is an important topic related to the human health. This paper reports a comparison of the variable selection of near infrared (NIR) spectra by multiple linear regression (MLR-NIR) with partial least squares (PLS-NIR) models for the quantification of TPM in fried vegetable oils. The use of PLS-NIR offers an alternative in laboratory bench equipment for the determination of TPM in oils employed for frying different kinds of foods with relative prediction errors of 6.5%, a coefficient of determination for prediction of 0.99 and a residual predictive deviation (RPD) of 9.2 when selected wavenumber intervals were employed. MLR-NIR allows the selection of a reduced number of wavenumber in order to develop low cost instruments to evaluate the frying oil quality. Based on the NIR signals at four wavenumbers, the relative prediction error was 12.1%, the coefficient of determination for prediction was 0.96 and the RPD was 5.0.

scholarly journals Spear leaf in determining the harvest timing of peach palm heart

2020 ◽  
Vol 38 (4) ◽  
pp. 356-362
Author(s):  
Valéria A Modolo ◽  
Larissa do N Ferreira ◽  
Sandra H Spiering ◽  
Norma M Erismann
Keyword(s):  
Mass Production ◽  
Total Mass ◽  
Weather Conditions ◽  
Leaf Length ◽  
Peach Palm ◽  
Palm Heart ◽  
Harvest Timing ◽  
One Year ◽  
Leaf Parameters

ABSTRACT The harvest timing of peach palm stems for heart-of-palm production is mainly defined by the height and diameter of the stem. Spear leaf parameters could be used in the field to obtain a higher heart-of-palm yield. The aim of this study is to verify if the length and opening of the spear leaf are related to the peach palm heart production. Three harvests were carried out in Campinas (SP), over a period of one year. Before harvest the plants were measured: main stem circumference, height, number of tillers and leaves, length and degree of spear leaf opening. After stem harvest, heart-of-palm production was evaluated. Regardless of the harvest date, the length of the first-rate heart-of-palm was longer when the spear leaf was open. Total mass production of heart-of-palm as a function of spear leaf opening is variable and dependent on weather conditions. When there was a difference in total mass production, this was higher when spear leaf was open. There was no correlation between spear leaf length and total heart-of-palm production. Although there may be an increase in the number of stalks, this had not resulted in a significant effect in terms of mass. The insertion of the spear leaf openness criterion in the determination of the harvest timing may not be worthwhile, since the payment to the producer occurs on the total mass of first-rate heart-of-palm, which may not be higher due to the degree of spear leaf opening.

scholarly journals Noninvasive Fractional Flow Reserve for the Diagnosis of Lesion-specific Ischemia: A Case Example

2015 ◽  
Vol 5 ◽  
pp. 3 ◽  
Author(s):  
Jesper Møller Jensen ◽  
Lars Christian Gormsen ◽  
Henning Mølgaard ◽  
Bjarne Linde Nørgaard
Keyword(s):  
Fractional Flow Reserve ◽  
Coronary Intervention ◽  
Fractional Flow ◽  
Atypical Chest Pain ◽  
Physically Active ◽  
Flow Reserve ◽  
Percutaneous Coronary ◽  
One Year ◽  
Selection Of

A physically active 52-year-old male with atypical chest pain was referred to our department. A coronary computed tomography angiography (CCTA) showed a stenotic plaque in the mid left anterior descending coronary artery (LAD). A rest–stress Rubidium-82 myocardial perfusion was normal. One year later the patient sustained a cardiac arrest and percutaneous coronary intervention of the mid-LAD was successfully performed. The original CCTA data were submitted for noninvasive determination of fractional flow reserve (FFRCT) revealing an ischemia-producing lesion in the mid-LAD. This case demonstrates the inherent limitations of assessing lesion-specific ischemia. FFRCT shows promise as a new method for future selection of patients for coronary angiography.

A stochastic study of floods in Canada: frequency analysis and regionalization

1991 ◽  
Vol 18 (2) ◽  
pp. 225-236 ◽  
Author(s):  
Daniel Caissie ◽  
Nassir El-Jabi
Keyword(s):  
Frequency Analysis ◽  
Extreme Values ◽  
Flood Frequency ◽  
Independent Random Variables ◽  
Time Interval ◽  
Partial Duration Series ◽  
Stream Discharge ◽  
Index Flood ◽  
One Year

Peak stream discharge is a hydrologic parameter that is very important for the determination of flood risk, design of engineering works, and management of water resources. In this study, some 237 stream records across Canada were analyzed using the theory of stochastic processes applied to extreme values. This model, based on partial duration series analysis, was applied to each stream record, considering the time of occurrence of floods to be a Poisson process. In addition, exceedances (values above a given discharge level or truncation level) were considered to be independent random variables identically distributed over a one-year time interval. After this frequency analysis of each stream record, a regionalization of the flood frequency characteristics in Canada was performed using two different approaches: multiple regression analysis and index-flood method. A comparison of the two approaches was carried out by examining mean relative error and root-mean-square error. It was determined that the level of difficulty in applying the stochastic flood model was not the same across Canada. Moreover, error associated with the index-flood method is mainly due to error in estimating low return floods. Key words: flood, partial duration series, regional hydrology, index-flood method, low return flood.

scholarly journals Application of Selected Reverse Engineering Procedures Based on Specific Requirements

2021 ◽  
Vol 4 (1) ◽  
pp. 75-85
Author(s):  
Mária Hrčková ◽  
Pavol Koleda
Keyword(s):  
Reverse Engineering ◽  
Time Interval ◽  
Base Line ◽  
Cloud Processing ◽  
Point Cloud Processing ◽  
Starting Point ◽  
Tool Replacement ◽  
Geometric Elements ◽  
Selection Of

Abstract The paper describes a solution of reverse engineering tasks using the equipment of the laboratory of the Technical University in Zvolen. The first task was linked to evaluation of a wear rate of the tool used to for mulching and elimination of unwanted wood or weed vegetation. The obtained data will be used as a base line for determination of the time interval for the tool replacement. We developed a prototype of components and their drawing documentation for a single-purpose machine for cutting barley. We created the 3D model using the method of photogrammetry. The finished drawing documentation and prototypes were handed over to the company KRUP. Finally, we identified the most suitable procedures for creating a model of a part with a complex shape. We tested the techniques of editing the point cloud processing, as well as of smoothing the surfaces and automating the creation of partial geometric elements of the model. Based on the properties of the component, which is the starting point of the entire reverse engineering process and from the achieved results, we set recommendations for the selection of appropriate procedures.

scholarly journals On the geometry of baselines suitable for UT1 estimation with VLBI Intensive sessions

2021 ◽  
Author(s):  
Lisa Kern ◽  
Matthias Schartner ◽  
Benedikt Soja ◽  
Axel Nothnagel ◽  
Johannes Böhm
Keyword(s):  
Rotation Axis ◽  
Formal Error ◽  
One Year ◽  
Single Baseline ◽  
The Individual ◽  
Long Baselines ◽  
Right Ascension ◽  
East West ◽  
Selection Of

<p>One hour single baseline VLBI sessions, so-called Intensives, are routinely observed to derive UT1-UTC with a short latency. The selection of baselines for VLBI Intensive sessions and their application for the determination of UT1-UTC is a complex task. Thus far, it has been understood that long east-west extensions are critical for the accuracy of UT1-UTC. In this presentation, we show, that the answer is not as simple as that. </p><p>We run Monte-Carlo simulations for a global 10° grid of artificial station locations and discuss the suitability of the individual baselines for UT1-UTC estimation based on the formal error of dUT1. The antennas are located at latitudes of -80° to 80° and longitudes of 0° to 180° and are assumed to have the same properties than the WETTZ13S telescope. The nine stations at longitude 0° on the northern hemisphere are defined as reference stations. In total, 2898 possible baselines between the reference stations and other artificial stations are investigated over one year based on monthly schedules to minimize potential seasonal variations. Thus, with this study, it is possible to derive a complete picture of which baselines are most suitable for dUT1 estimates. </p><p>In general, the findings show optimal global geometries concerning Intensives. For example, we can confirm that the IVS-INT1 baseline including the stations Kokee and Wettzell is among the best ones available. Furthermore, we show that north-south baselines are also sensitive to dUT1 as long as their orientations are not parallel to the Earth rotation axis. Moreover, we highlight that east-west baselines on the equator are not suitable for estimating dUT1 due to the lack of variety in right-ascension of the visible sources. Additionally, we highlight, that very long baselines are problematic due to the highly restricted mutual visibility.</p>

scholarly journals The Development of a Quantitative RCM/MSG Application using Microsoft Office

AVIA ◽  
2021 ◽  
Vol 2 (2) ◽  
Author(s):  
R Sianturi ◽  
E Suwondo
Keyword(s):  
Low Cost ◽  
Application Development ◽  
Microsoft Excel ◽  
Academic Field ◽  
Microsoft Access ◽  
Microsoft Office ◽  
User Friendly ◽  
The Relationship ◽  
Selection Of

The number of small to medium scale industries makes the development of a low cost and easy to use application to support maintenance programs development is necessary. Besides for industries, the developed application can be used also in the academic field for research. For cost reasons, the application is developed using Microsoft Access and Microsoft Excel. The development of the application is carried out in three steps, i.e. the determination of application specifications, the programming in Microsoft Access and Microsoft Excel, and the validation and user-friendly test. The application is developed by considering the relationship between the risk quantification of a failure effect and the selection of a maintenance task and its interval. The effectiveness assessments are based on the failure risk reduction up to an acceptable level. The developed application is named "Quantitative RCM/MSG". The application can conduct a database management according to the steps of the RCM/MSG method. The application can determine the required maintenance tasks and intervals for the category of evident and hidden failure effects by taking the safety and financial aspects into account. This application does its functions correctly and easy to use. For further application development, application can be developed using series and combination systems. Application with module redesign on default action

A Low-Cost Image Acquisition System for the Systematic Observation of Traces of Buried Archaeological Structures

GEOMATICA ◽  
2014 ◽  
Vol 68 (4) ◽  
pp. 299-308 ◽  
Author(s):  
Dimitris Kaimaris ◽  
Petros Patias
Keyword(s):  
Low Cost ◽  
Image Acquisition ◽  
Satellite Image ◽  
Systematic Observation ◽  
Large Numbers ◽  
Image Acquisition System ◽  
One Year ◽  
Over Time ◽  
Remote Sensing Archaeology

The determination of the best period for image acquisition is of major importance for research in aerial and remote sensing archaeology. This will facilitate enhanced research results by enabling the iden ti fi cation of large numbers of traces that would be otherwise unidentified. To determine the best period for satellite image acquisition in the extensive archaeological plain of Philippi (Eastern Macedonia, Greece), a systematic observation of change of intensity over time, at known places of buried archaeological structures, was performed. A low-cost image acquisition UAV was developed, which was used to acquire images every month for the period of one year.

scholarly journals Determine the Tonality of of News Media Reports by Conceptual Analysis

2019 ◽  
Vol 09 (4) ◽  
pp. 67-79
Author(s):  
A.A. Khoroshilov ◽  
Y.D. Kozlovskaya ◽  
R.R. Mussabayev ◽  
A.M. Krassovitsky ◽  
A.A. Khoroshilov
Keyword(s):  
News Media ◽  
Time Interval ◽  
Software Complex ◽  
News Reports ◽  
Evaluation Measure ◽  
The Republic ◽  
Media Reports ◽  
Selection Of

The article describes the solution of the task of creating linguistic tools and the methodology of automatic determination of the tonality of news reports related to the quality of life of an ordinary citizen of the Republic of Kazakhstan. The approach for solving the problem was defined, software and methods of automated creation of object dictionaries and evaluation predicate dictionaries, as well as evaluation measure modifier dictionaries were developed. The experiment confirmed the correctness of the proposed methodology for assessing events covered in news reports and the operability of the software complex. This technique, with appropriate selection of event assessment objects, can be used in creating tonal portraits of specific authors on the set of their publications, as well as tonal portraits of various news aggregates on the set of events they cover in a particular time interval.

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