scholarly journals Evaluating the parameters of a mobile maize dryer in practice

2013 ◽  
Vol 61 (6) ◽  
pp. 1779-1784
Author(s):  
Josef Los ◽  
Jiří Fryč ◽  
Zdeněk Konrád
Keyword(s):  
Large Scale ◽  
Electric Energy ◽  
Operating Parameters ◽  
The Czech Republic ◽  
Maize Hybrids ◽  
Post Harvest ◽  
Second Stage ◽  
Energy Intensiveness ◽  
Two Stages ◽  
The Given

The method of drying maize for grain has been recently employed on a large scale in the Czech Republic not only thanks to new maize hybrids but also thanks to the existence of new models of drying plants. One of the new post-harvest lines is a plant in Lipoltice (mobile dryer installed in 2010, storage base in 2012) where basic operational measurements were made of the energy intensiveness of drying and operating parameters of the maize dryer were evaluated. The process of maize drying had two stages, i.e. pre-drying from the initial average grain humidity of 28.55% to 19.6% in the first stage, and the additional drying from 16.7% to a final storage grain humidity of 13.7%. Mean volumes of natural gas consumed per 1 t% for drying in the first and second stage amounted to 1.275 m3 and 1.56 m3, respectively. The total mean consumption of electric energy per 1 t% was calculated to be 1.372 kWh for the given configuration of the post-harvest line.

scholarly journals Computer Vision Technique for Blind Identification of Modal Frequency of Structures from Video Measurements

2021 ◽  
Vol 10 (1) ◽  
pp. 12
Author(s):  
Vishal Allada ◽  
Thiyagarajan Jothi Saravanan
Keyword(s):  
Large Scale ◽  
Principal Component ◽  
Frequency Separation ◽  
Blind Identification ◽  
Modal Frequency ◽  
Motion Data ◽  
Second Stage ◽  
Mode Decomposition ◽  
Two Stages ◽  
Millennium Bridge

Operational modal analysis (OMA) is required for the maintenance of large-scale civil structures. This paper developed a novel methodology of non-contact-based blind identification of the modal frequency of a vibrating structure from its video measurement. There are two stages in the proposed methodology. The first stage is extracting the motion data of the vibrating structure from its video using a complex steerable pyramid. In the second stage, the principal component analysis combined with analytical mode decomposition is used for modal frequency separation from the motion data. Numerical validation of the methodology on a 10 DOF model is presented. The application of the proposed methodology on the London Millennium Bridge is also presented.

Large-Scale Tests Performed in Support of LBB Projects Applied to WWER Type NPPs in the Czech Republic in Years 1992–1994

2009 ◽  
Author(s):  
Dana Lauerova ◽  
Jiri Palyza ◽  
Jiri Zdarek
Keyword(s):  
Czech Republic ◽  
Large Scale ◽  
Bending Moment ◽  
Limit Load ◽  
Computational Results ◽  
The Czech Republic ◽  
Normal Operating ◽  
Two Stages ◽  
Large Scale Tests ◽  
Stable Tearing

In the paper, an overview of large-scale experiments performed on components of WWER primary circuits within several LBB projects conducted in the Czech Republic in years 1992 – 1994 is presented. The tested components were replicas of the real ones; they contained a through-wall crack and were loaded by pressure and bending moment in two stages, as appropriate according to the LBB methodology. All tested components exhibited stable behaviour under normal operating loading superposed with safe shutdown earthquake loading (NOC + SSE) applied during 1st stage of experiment. During 2nd stage of experiment, under loading by bending moment only, the models usually exhibited stable tearing of the crack, in some cases limit load (maximum force at loading controlled by displacement) was reached. In the paper, the experiments are briefly described, with presenting the main experimental and (in some cases) FE computational results.

THERMODYNAMIC AND ELECTROCHEMICAL STUDY OF VANADIUM SOLUTIONS: TOWARDS VANADIUM RECOVERY FROM A SPENT CATALYST

2021 ◽  
Author(s):  
René Antaño-López ◽  
Fidel Hernández-Pérez ◽  
Fabricio Espejel-Ayala
Keyword(s):  
Petrochemical Industry ◽  
Large Scale ◽  
Industrial Wastes ◽  
Electrochemical Study ◽  
Spent Catalyst ◽  
Second Stage ◽  
Reduction Potentials ◽  
Electrochemical Processes ◽  
Thermochemical Processes ◽  
Two Stages

Due to the low abundance of vanadium in nature (about 135 g/t), the feasibility to recover it from industrial wastes has highly attracted scientific and technological attention. The main recovery routes reported are associated with chemical or thermochemical processes. However, the electrochemical recovery of vanadium from industrial wastes has been poorly investigated. In this work, a thermodynamic and electrochemical study for the possible vanadium recovery from a spent catalyst generated in the petrochemical industry was conducted. The study was divided into two stages using low vanadium concentrations. In the first stage, the recovery of vanadium was possible in its V4+ state at low reduction potentials, whereas for the second stage, cyclic voltammetry was used to calculate the diffusion coefficient and the heterogeneous velocity coefficient of the V5+/V4+ redox pair. The obtained values are similar to those reported in the literature for aqueous solutions at high vanadium concentrations and would allow the design of the system at large scale. This report aims to set the conditions for the possible vanadium recovery from a spent catalyst by means of electrochemical processes, although the optimization of such conditions must be further explored.

Study of Cyclization of 1-Benzoyl-3-methyl-3-(2-methoxycarbonylphenyl)thiourea to 1-Methyl-2-thioxo-4-quinazolone

1993 ◽  
Vol 58 (5) ◽  
pp. 1122-1132 ◽  
Author(s):  
Jaromír Kaválek ◽  
Vladimír Macháček ◽  
Miloš Sedlák ◽  
Vojeslav Štěrba
Keyword(s):  
Reaction Mechanism ◽  
Kinetic Study ◽  
Title Reaction ◽  
Initial Substance ◽  
Second Stage ◽  
Rate Determining Step ◽  
Benzoyl Group ◽  
Two Stages ◽  
The Given

The reaction mechanism of the title reaction was proposed on the bases of the kinetic study. The reaction takes place in two stages considerably differing in rates. In the first, faster stage, the anion of initial substance cyclizes to 1-methyl-3-benzoyl-2-thioxo-4-quinazolone. The reaction is reversible, the concentration of 1-methyl-3-benzoyl-2-thioxo-4-quinazolone decreases with increasing concentration of methanolate. In the second stage, the benzoyl group rearrangement in the given substance from nitrogen to sulfur and subsequent methanolysis to 1-methyl-2-thioxo-4-quinazolone take place. The rate-determining step is the methanolysis for [CH3O(-)] < 4 . 10-3 mol l-1 and the benzoyl group rearrangement for higher methanolate concentrations.

scholarly journals Reliability Assessment of Aircraft Commutators

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7404
Author(s):  
Wojciech Wawrzyński ◽  
Mariusz Zieja ◽  
Justyna Tomaszewska ◽  
Mariusz Michalski
Keyword(s):  
Operating Time ◽  
Reliability Assessment ◽  
Electric Energy ◽  
Primary Source ◽  
Technical Condition ◽  
Diagnostic Parameter ◽  
Second Stage ◽  
Flight Profile ◽  
Two Stages ◽  
Starter Generator

The article describes the method of predicting the reliability and durability of an aircraft commutator, which is a primary source of electric energy in helicopters. Tests were conducted for 10 starter-generators. From this research it follows that the technical condition of brushes and bearings has a significant impact on the reliability of starter-generators. The reliability of starter-generators was determined based on the method consisting of two stages that was adopted: the first stage involved determining the density function of changes in diagnostic parameter depending on the operating time, but the second stage included the assessment of the reliability of bearings of the starter-generator taking into account the real flight profile. The first stage of the adopted method consisted of defining the dynamic model of changing the length of the starter-generator’s brush, which became the probabilistic model. Subsequently, based on differential equations, Fokker–Planck partial differential equation was derived, which describes the process of increasing the brush wear in a probabilistic way. This method enables the prediction of the residual durability of the helicopter’s starter-generator due to the change in a diagnostic parameter which is the wear of brushes during starter-generator operation. The second stage of this method allows determining the durability of starter-generator’s bearings building upon the average helicopter’s flight profile. Owing to the difficulty in measuring the wear of bearings, the relation between the durability of bearings and the temperature of surroundings can be applied by replacing the flight altitude with temperature. The reliability of the helicopter’s starter-generator was determined based on the serial-type reliability structure.

scholarly journals Investigating pre-service science teachers’ laboratory approach choices

2016 ◽  
Vol 8 (1) ◽  
pp. 61 ◽  
Author(s):  
Nurhan ÖZTÜRK GEREN ◽  
Esra BOZKURT ALTAN ◽  
Serhat ERCAN
Keyword(s):  
Science Teachers ◽  
Science Curriculum ◽  
Service Science ◽  
Science Laboratory ◽  
Structured Interviews ◽  
Inquiry Based Learning ◽  
Second Stage ◽  
Two Stages ◽  
The Given ◽  
Selection Of

The main focus of the current study was to determine what kind of laboratory approaches will be designed how this process will be evaluated by pre-service teachers. The study was carried out on the basis of a qualitative paradigm. The study group of the research consisted of 40 pre-service science teachers. In the current study, the application was conducted within the Laboratory Applications in Science I-II courses at two stages. The per stage was conducted in 14 weeks (four hours per weeks). The first stage of the process (14 weeks) started with a theoretical presentation introducing laboratory approaches and was conducted with the guidance of five experiment manuals designed on the basis of different laboratory approaches ranging from a confirmatory laboratory approach to an inquiry-based learning by the researcher. In the second stage, the pre-service teachers were asked to examine the units and objectives of the Science Curriculum Program and then were asked to select a laboratory approach and set the objectives to design an activity manual. The pre-service teachers worked for five weeks to determine the objectives, find the appropriate approach and design an experiment manual in line with the selected approach. Then, each group conducted the laboratory class under the guidance of their experiment manual that they had developed for each week. The data of the study was collected within two periods through the difficulties experienced, skills attained through the process, reflective texts presenting course-related suggestions and semi-structured interviews. It was determined that the students experienced some difficulties in the selection of the laboratory approach for the given topic and the design of experiment manuals; they preferred inquiry-based learning laboratory activities as they were believed to be more effective and administration of experiment manuals to peers were believed to be conducive to professional development.Keywords:Laboratory applications in science, laboratory approaches, pre-service science teachers 

scholarly journals Potassium nitrate to overcome dormancy of Urochloa humidicola Comum seeds

2021 ◽  
Vol 42 (3) ◽  
pp. 963-978
Author(s):  
Thaís Soares Pereira ◽  
◽  
Tatiane Sanches Jeromini ◽  
Breno Rosa Neves ◽  
Renato Téo de Barros ◽  
...  
Keyword(s):  
Seed Germination ◽  
Water Content ◽  
Seed Dormancy ◽  
Large Scale ◽  
Potassium Nitrate ◽  
Germination Percentage ◽  
Main Difficulty ◽  
Second Stage ◽  
Suitable Treatment ◽  
Two Stages

The main difficulty with propagating Urochloa humidicola Comum is the high percentage of seed dormancy. Thus, the objective of this study was to develop a treatment to overcome seed dormancy and promote seed germination of this species that can be applied at a large scale. This study was conducted in two stages. First, the following treatments were evaluated using one seed lot: control (without treatment), immersion in H2SO4 (98%, 36N) for 10 min, moistening the germination substrate with KNO3 (0.2%) and immersion in KNO3 at concentrations of 0%, 2%, 4%, 6%, and 8% for periods of 12, 24, 36, and 48 h, followed by drying in the shade. In the second stage, three seed lots were evaluated in all of the aforementioned treatments, except for those of immersion in 0% KNO3 and of all concentrations for 36 and 48 h. The seeds were evaluated for water content, germination, percentage of abnormal seedlings, dead and dormant seeds, first count, and average germination time. Immersion in the KNO3 solution was efficient in overcoming dormancy and promoting germination. To be used by companies, the immersion of seeds in a 4% KNO3 solution for 24 h was the most suitable treatment to overcome dormancy and promote the germination of U. humidicola Comum seeds.

scholarly journals An Efficient Method for a Specific Case of Detecting Impulse Noise on Scanned Documents

2021 ◽  
Author(s):  
Petar Prvulović ◽  
Jelena Vasiljević ◽  
Dhinaharan Nagamalai
Keyword(s):  
Large Scale ◽  
Impulse Noise ◽  
Detection Method ◽  
Detection Accuracy ◽  
Primary Concern ◽  
Noise Detection ◽  
Second Stage ◽  
Margin Detection ◽  
Two Stages ◽  
Scanned Documents

This paper explains a method used to detect the presence of impulse noise in a set of scanned documents as a part of OCR preprocessing. As the document set is supposed to be processed in large scale, the primary concern of the noise detection method was efficiency within existing project constraints. Following the nature of noise, the method seeks to detect the presence of noise in document margins. The method works in two stages. First stage is margin detection, based on color spectre analysis. Second stage is noise recognition in margin samples, based on a pixel contrast score. The resulting implementation proved efficient both in terms of detection accuracy and algorithmic complexity.

scholarly journals Optimal Replenishment and Lot Sizing Strategy for Inventory Mechanism with Step-Shaped Demand and Backordering

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Lixia Zhang ◽  
Lili Han
Keyword(s):  
Lot Sizing ◽  
Closed Form Solution ◽  
Planning Horizon ◽  
Form Solution ◽  
Inventory Cost ◽  
Second Stage ◽  
Demand Rate ◽  
Two Stages ◽  
The Given ◽  
Infinite Planning Horizon

This paper discusses the inventory mechanism with backordering and with the infinite planning horizon consisting of two stages wherein the demand rate in the first stage is strictly greater than that in the second stage. To minimize the retailer’s inventory cost, we establish a lot sizing decision model. On the basis of the inventory cost analysis, we present a closed-form solution to the model and provide an optimal replenishment and stocking strategy to the retailer. The given numerical experiments show the validity of the model.

Altered Fine Structure of B Lymphocytes Correlated with Defective Terminal Differentiation

1973 ◽  
Vol 31 ◽  
pp. 386-387
Author(s):  
Dale E. Bockman ◽  
L. Y. Frank Wu ◽  
Alexander R. Lawton ◽  
Max D. Cooper
Keyword(s):  
Immune Deficiency ◽  
B Lymphocytes ◽  
Plasma Cells ◽  
Present Report ◽  
Specific Antigen ◽  
Terminal Differentiation ◽  
Second Stage ◽  
Two Stages ◽  
Deficiency Diseases ◽  
Cell Line Generation

B-lymphocytes normally synthesize small amounts of immunoglobulin, some of which is incorporated into the cell membrane where it serves as receptor of antigen. These cells, on contact with specific antigen, proliferate and differentiate to plasma cells which synthesize and secrete large quantities of immunoglobulin. The two stages of differentiation of this cell line (generation of B-lymphocytes and antigen-driven maturation to plasma cells) are clearly separable during ontogeny and in some immune deficiency diseases. The present report describes morphologic aberrations of B-lymphocytes in two diseases in which second stage differentiation is defective.

Sign in / Sign up

Export Citation Format

Share Document