scholarly journals Solidification Mechanism of the D-Gun Sprayed Fe-Al Particles

2017 ◽  
Vol 62 (4) ◽  
pp. 2391-2397
Author(s):  
W. Wołczyński ◽  
C. Senderowski ◽  
B. Fikus ◽  
A.J. Panas
Keyword(s):  
Centrifugal Force ◽  
Water Surface ◽  
Solid Shell ◽  
Liquid Droplets ◽  
Liquid Particle ◽  
Second Stage ◽  
Two Stages ◽  
Solidification Mechanism ◽  
The Impact ◽  
Spraying Method

AbstractThe detonation gas spraying method is used to study solidification of the Fe-40Al particles after the D-gun spraying and settled on the water surface. The solidification is divided into two stages. First, the particle solid shell forms during the particle contact with the surrounding air / gas. Usually, the remaining liquid particle core is dispersed into many droplets of different diameter. A single Fe-Al particle is described as a body subjected to a rotation and finally to a centrifugal force leading to segregation of iron and aluminum. The mentioned liquid droplets are treated as some spheres rotated freely / chaotically inside the solid shell of the particle and also are subjected to the centrifugal force. The centrifugal force, and first of all, the impact of the particles onto the water surface promote a tendency for making punctures in the particles shell. The droplets try to desert / abandon the mother-particles through these punctures. Some experimental evidences for this phenomenon are delivered. It is concluded that the intensity of the mentioned phenomenon depends on a given droplet momentum. The droplets solidify rapidly during their settlement onto the water surface at the second stage of the process under consideration. A model for the solidification mechanism is delivered.

scholarly journals STUDY OF THE EFFECT OF EXAMINATION STRESS ON THE INDICES OF THE MENTAL WORKING CAPACITY OF UNIVERSITY STUDENTS

2019 ◽  
Vol 98 (5) ◽  
pp. 527-533
Author(s):  
Ekaterina S. Grosheva ◽  
N. V. Sokolova ◽  
O. I. Gubina
Keyword(s):  
Correlation Analysis ◽  
Factor Model ◽  
Mental Performance ◽  
Low Level ◽  
Second Stage ◽  
Reactive Anxiety ◽  
Exam Stress ◽  
Group 2 ◽  
Two Stages ◽  
The Impact

Introduction. In this study, there were examined features of the impact of exam stress on mental performance and anxiety level in 2-3 year students of medical and pedagogical universities. Materials and methods. The levels of reactive and personal anxiety were studied according to the C. Spielberger anxiety scale adapted by Yu. L. Khanin, attention was assessed using the Pieron-Rüser test, the Bourdon-Anfimov correction test was used to study the level of mental performance, the type of temperament was determined using a two-factor model of extraversion and neuroticism using questionnaire H.J. Eysenck. The study was implemented in two stages: the first stage - during the semester period, and the second stage - during the examination session. For processing the data obtained during the study, a standard statistical software package was used, and correlation analysis was used to identify the relationships between the variables studied. Results. The assessment of situational anxiety in the second stage showed a statistically significant increase in the number of students with high and extremely high levels of anxiety in 24 and 3 respondents from the 1 group respectively (p ≤ 0.05), and 17 and 3 respondents in group 2, respectively (p ≤ 0.05). Correlation analysis of the relationship between reactive anxiety and mental performance showed a weak and medium correlation among students in both groups. The attention study in both groups showed that in the second stage of the study, the indices change: in 1 group, the proportion of students with a low level of attention increased to 40%, and in 2 the number of students with low and very low level of attention decreased by 2.77% and 11.08%, respectively (p ≤ 0.05). Conclusion. Increased study loads and requirements for students were proved to contribute to an increase in the level of reactive anxiety, in the period between sessions indices of mental performance in students decrease, respectively, and the level of attention declines.

Investigation of the Cost of Future Naval Amphibious Capability

2015 ◽  
Author(s):  
Andrew J. Jones ◽  
Rob Armstrong
Keyword(s):  
Task Group ◽  
Second Stage ◽  
The Creation ◽  
Two Stages ◽  
Vessel Impact ◽  
The Cost ◽  
The Impact

Through the creation of a large number of concept designs, the cost and vessel impact of deploying and supporting amphibious operations has been investigated. The investigation has looked at capabilities such as the transportation and delivery of vehicles, landing craft, aviation and embarked troops in a number of platform types such as LPDs, LHDs and Ro-Ros. A series of trends describing the costs of the capability have been investigated to estimate the cost of individual capabilities within a design. Over the timeframe of the study, vessel manning is predicted to change and a method of predicting the crew requirement has been developed to investigate the impact of reduced manning on amphibious platform designs. This is the first of two stages of work; in the second stage the requirements for a task group will be investigated to determine the best way to deploy capability at a fleet level.

Studies on the impact of external fire on the lye of the shelter housing

2021 ◽  
Vol 109 (1) ◽  
pp. 11-16
Author(s):  
A. Baryłka
Keyword(s):  
Numerical Analysis ◽  
Second Stage ◽  
Heating And Cooling ◽  
Flow Through ◽  
Time Changes ◽  
Two Stages ◽  
The Impact ◽  
Fourier Equation ◽  
Practical Implications ◽  
Vast Area

Purpose: The presented article presents a numerical analysis carried out to determine the impact of an external fire taking place on the surface of the ground on the level of stress of the trench shelter casing protected by a layer of soil. Design/methodology/approach: Numerical analysis was carried out in two stages. In the first stage, a quasi-stationary distribution of the initial temperature in the centre of the ground and the shelter casing was sought. In the second stage of the analysis, the effect of the fire was considered according to the profile of time changes in the temperature of the shelter object. Findings: We assume that the trench shelter is in an oblong shape, and the fire extends over a vast area. The area surrounding the shelter casing was treated as a material with average constant thermodynamic values. Research limitations/implications: The process related to heating and cooling the enclosure was described on the basis of the Fourier equation on heat conduction in terms of the heterogeneous nature of the material, primer and concrete. Practical implications: The use of the trench shelter model as a research element in the design of special objects. Originality/value: The methods of non-stationary temperature flow through the ground and the shelter casing used, allows for a very realistic indication of how the housing will behave under the influence of high temperature caused by an external fire. The article can be useful for designers who design underground shelters.

scholarly journals Optimal Facility Location Model Based on Genetic Simulated Annealing Algorithm for Siting Urban Refueling Stations

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Dawei Chen ◽  
Shun Zhou ◽  
Yuanchang Xie ◽  
Xuhong Li
Keyword(s):  
Simulated Annealing ◽  
Simulated Annealing Algorithm ◽  
Impact Factors ◽  
Location Decisions ◽  
Second Stage ◽  
Genetic Simulated Annealing Algorithm ◽  
Annealing Algorithm ◽  
Two Stages ◽  
Station Location ◽  
The Impact

This paper analyzes the impact factors and principles of siting urban refueling stations and proposes a three-stage method. The main objective of the method is to minimize refueling vehicles’ detour time. The first stage aims at identifying the most frequently traveled road segments for siting refueling stations. The second stage focuses on adding additional refueling stations to serve vehicles whose demands are not directly satisfied by the refueling stations identified in the first stage. The last stage further adjusts and optimizes the refueling station plan generated by the first two stages. A genetic simulated annealing algorithm is proposed to solve the optimization problem in the second stage and the results are compared to those from the genetic algorithm. A case study is also conducted to demonstrate the effectiveness of the proposed method and algorithm. The results indicate the proposed method can provide practical and effective solutions that help planners and government agencies make informed refueling station location decisions.

scholarly journals Assessment of telephone speech perception in individuals who received cochlear implant in the period 1993-2003

CoDAS ◽  
2013 ◽  
Vol 25 (5) ◽  
pp. 400-406 ◽  
Author(s):  
Pricila Perini Rigotti ◽  
Orozimbo Alves Costa ◽  
Maria Cecilia Bevilacqua ◽  
Leandra Tabanez do Nascimento ◽  
Katia de Freitas Alvarenga
Keyword(s):  
Speech Perception ◽  
Cochlear Implant ◽  
Cell Phone ◽  
Rehabilitation Program ◽  
Second Stage ◽  
Auditory Rehabilitation ◽  
Satisfactory Performance ◽  
Telephone Speech ◽  
Two Stages ◽  
The Impact

OBJECTIVE: To evaluate telephone speech perception in individuals who received cochlear implant in the period 1993-2003. METHODS: Twenty seven CI users were divided into pre and post-lingual groups, being the speech perception assessed in two stages: first by a list of sentences imposed on speakerphone with the same mapping used to evaluate the phone and, in a second stage, using the landline, landline phone adapter with CI and cell phone. RESULTS: In the group of pre-lingual hearing loss, 75% of subjects were able to maintain a dialogue with the interlocutor and 19% did so with difficulty. In the post-lingual group, 89% were able to maintain the dialogue with the interlocutor and 11% did so with difficulty. Both groups of subjects pre and post-lingual use the phone as a media, and most have satisfactory performance without the need for aid or CI accessories. CONCLUSION: One of the benefits of the CI is to introduce the life of the hearing impaired phone use regardless of their technology and accessories, as well as with the phone adapter and cell phone. In this study, most individuals CI users showed satisfactory performance in the comprehension of sentence and questions by the telephone, with better performance, although discrete, for the group post-lingual. Thus, there is the importance of careful indication of the IC and auditory rehabilitation program that minimize the impact of deafness in the communication, especially via telephone, regardless of the time when the hearing was acquired. So, this fact improves the conditions for CI users to maintain their daily activities, following the dynamism of contemporary life.

SMS spam filtering and thread identification using bi-level text classification and clustering techniques

2016 ◽  
Vol 43 (1) ◽  
pp. 75-87 ◽  
Author(s):  
Naresh Kumar Nagwani ◽  
Aakanksha Sharaff
Keyword(s):  
State Of The Art ◽  
Binary Classification ◽  
Spam Detection ◽  
Spam Filtering ◽  
Clustering Techniques ◽  
Second Stage ◽  
Classification Technique ◽  
Two Stages ◽  
The Impact ◽  
Non Negative Matrix Factorization

SMS spam detection is an important task where spam SMS messages are identified and filtered. As greater numbers of SMS messages are communicated every day, it is very difficult for a user to remember and correlate the newer SMS messages received in context to previously received SMS. SMS threads provide a solution to this problem. In this work the problem of SMS spam detection and thread identification is discussed and a state of the art clustering-based algorithm is presented. The work is planned in two stages. In the first stage the binary classification technique is applied to categorize SMS messages into two categories namely, spam and non-spam SMS; then, in the second stage, SMS clusters are created for non-spam SMS messages using non-negative matrix factorization and K-means clustering techniques. A threading-based similarity feature, that is, time between consecutive communications, is described for the identification of SMS threads, and the impact of the time threshold in thread identification is also analysed experimentally. Performance parameters like accuracy, precision, recall and F-measure are also evaluated. The SMS threads identified in this proposed work can be used in applications like SMS thread summarization, SMS folder classification and other SMS management-related tasks.

scholarly journals Policies for Improving PM2.5 Particles and GHGs Emissions in a Maritime Port of Taiwan: Evidence Based on the INDC and GGRMA Regulations

2021 ◽  
Vol 9 (12) ◽  
pp. 1315
Author(s):  
Ching-Chih Chang ◽  
Yi-An Tsai
Keyword(s):  
Pollution Reduction ◽  
Evidence Based ◽  
Second Stage ◽  
Reduce Emissions ◽  
Set Up ◽  
Liquid Natural Gas ◽  
Two Stages ◽  
The Impact ◽  
Policy Proposals ◽  
Port Of Kaohsiung

The impact of possible emission reduction policies designed to reduce port emissions in the Port of Kaohsiung in Taiwan was analyzed, focusing on ways to reduce air pollution from CO2, CH4, N2O, PM10, PM2.5, NOx, and SOx generated by vessels, cranes, and truck tractors in the port. This paper was set up in two stages to determine how pollution reduction policies could reach the 2030 and in 2050 goals. The results showed that emissions of CO2, CH4, N2O, PM10, PM2.5, NOx, and SOx could be reduced by 46%, 26%, 25%, 77%, 77%, 76%, and 68%, respectively, in the first stage (in 2030, INDC), and by 57%, 59%, 53%, 79%, 79%, 80%, and 69%, respectively, in the second stage (in 2050, GGGRMA), as compared to 2005 data. This paper concludes as follows: (1) for vessels, the use of liquid natural gas is the best way to reduce GHGs when navigating by water; (2) for bridge cranes, electrification is the better policy during operation; (3) in the case of truck tractors, the generation of battery-electric power is the best way to reduce emissions. These policy proposals for improving air quality can be applied to all ports in Taiwan.

scholarly journals Method of Abdominal Cavity Postoperative Infiltrates Treatment in Children with Appendiceal Peritonitis

2016 ◽  
Vol 23 (3) ◽  
Author(s):  
M. G. Melnichenko ◽  
V. V. Antoniuk ◽  
L. P. Tkachenko
Keyword(s):  
Abdominal Cavity ◽  
Physical Factors ◽  
Utility Model ◽  
Second Stage ◽  
Abdominal Region ◽  
Two Stages ◽  
The Impact ◽  
Rectal Suppositories

Treatment of postoperative abdominal infiltrates in children operated on appendicular peritonitis with the use of antibiotics and physical factors on the abdominal region according to the utility model includes two stages. The first stage involves regional antibacterial electrophoresis and therapeutic antibacterial microclysters. The second stage includes the impact of diadynamic therapy in infiltration projection and NSAIDs as rectal suppositories.

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.

Distributed Entropy Energy-Efficient Clustering algorithm for cluster head selection (DEEEC)

2020 ◽  
Vol 39 (6) ◽  
pp. 8139-8147
Author(s):  
Ranganathan Arun ◽  
Rangaswamy Balamurugan
Keyword(s):  
Energy Efficient ◽  
Clustering Algorithm ◽  
Cluster Head ◽  
Residual Energy ◽  
Energy Utilization ◽  
Sensor Nodes ◽  
Second Stage ◽  
Energy Efficient Clustering ◽  
Two Stages ◽  
Ch Selection

In Wireless Sensor Networks (WSN) the energy of Sensor nodes is not certainly sufficient. In order to optimize the endurance of WSN, it is essential to minimize the utilization of energy. Head of group or Cluster Head (CH) is an eminent method to develop the endurance of WSN that aggregates the WSN with higher energy. CH for intra-cluster and inter-cluster communication becomes dependent. For complete, in WSN, the Energy level of CH extends its life of cluster. While evolving cluster algorithms, the complicated job is to identify the energy utilization amount of heterogeneous WSNs. Based on Chaotic Firefly Algorithm CH (CFACH) selection, the formulated work is named “Novel Distributed Entropy Energy-Efficient Clustering Algorithm”, in short, DEEEC for HWSNs. The formulated DEEEC Algorithm, which is a CH, has two main stages. In the first stage, the identification of temporary CHs along with its entropy value is found using the correlative measure of residual and original energy. Along with this, in the clustering algorithm, the rotating epoch and its entropy value must be predicted automatically by its sensor nodes. In the second stage, if any member in the cluster having larger residual energy, shall modify the temporary CHs in the direction of the deciding set. The target of the nodes with large energy has the probability to be CHs which is determined by the above two stages meant for CH selection. The MATLAB is required to simulate the DEEEC Algorithm. The simulated results of the formulated DEEEC Algorithm produce good results with respect to the energy and increased lifetime when it is correlated with the current traditional clustering protocols being used in the Heterogeneous WSNs.

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