scholarly journals The “Sandwich” System: A Potential Solution for Protecting Overwintering Cornu aspersum Snails Reared in Semi-Intensive Heliciculture Farms in Colder Climates

Animals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1420
Author(s):  
Dan Manea ◽  
Anișoara Aurelia Ienciu ◽  
Ramona Ștef ◽  
Ioan Peț ◽  
Laura Șmuleac ◽  
...  
Keyword(s):  
Thermal Protection ◽  
Lower Surface ◽  
Habitat Choice ◽  
System A ◽  
Effective System ◽  
Cornu Aspersum ◽  
Air Cushion ◽  
Protective Structures ◽  
Overwintering Survival ◽  
Sandwich System

(1) Background: Hibernation in pens covered with LFC was associated with high mortality of C. aspersum snails in Romanian snail farms. This three-year study aimed to develop a simple, but effective system for protecting breeders in colder climates. (2) Methods: The first phase investigated the (pre)hibernal burrowing behavior and the overwintering habitat choice. Protective structures based on straw, LFC, and/or HDPE were tested at pilot level (no snails). The most suitable system was applied under farm conditions. (3) Results: Wood and ridge-tile micro shelters were significantly preferred to corrugated iron micro shelters. Burrowing specimens acted as shallow-burrowers, and this behaviorwas significantly more common for looser soils. All pilot systems displayed significantly higher thermal protection efficiency compared to the sole use of LFC. The balance between straw moistening and thermal protection favored using structure soil/LFC/straw/10-cm air cushion/HDPE. Its use yielded significantly higher survival compared to the sole use of LFC. Most hibernating snails clustered together in large groups, attached on the lower surface of micro shelters. Predator occurrence appeared to marginally affect overwintering survival. (4) Conclusions: The “sandwich” system could be an effective solution for overwintering mature C. aspersum snails in colder climates.

scholarly journals An Intelligent Course Decision Assistant by Mining and Filtering Learners’ Personality Patterns

2019 ◽  
Vol 9 (21) ◽  
pp. 4665 ◽  
Author(s):  
Ja-Hwung Su ◽  
Yi-Wen Liao ◽  
Liang-Ni Chen
Keyword(s):  
Subject Matter ◽  
Pattern Mining ◽  
Actual System ◽  
Strong Interest ◽  
System A ◽  
Area Of Interest ◽  
Effective System ◽  
The Subject ◽  
Learning Guide ◽  
Personality Patterns

For a student, determining how to choose from a set of courses is an important issue prior to learning. An appropriate learning guide can direct students toward an area of interest. The learning results produced by the student in this case are superior due to their strong interest in the subject matter. Although a number of methods have been proposed to address this issue, the effectiveness remains unsatisfactory. To this end, we created an effective system, called the personality-driven course decision assistant, to help students determine the courses they should select by mining and filtering learners’ personality patterns. For learner pattern mining, the relationships between the students’ learning results and the referred personalities are discovered to provide the learners with valuable information before learning. For filtering learner personality patterns, students with similar personality patterns are filtered to predict the potential learning results. Through the actual system, a number of subjective and objective evaluations were conducted, and the evaluation results reveal that the proposed system is highly effective and reliable.

Numerical Simulation on the Process of Al-Alloy Air Cushion Continuous Casting

2014 ◽  
Vol 496-500 ◽  
pp. 187-192
Author(s):  
Yan Lu Huang ◽  
Yu Min Zhang
Keyword(s):  
Continuous Casting ◽  
Solution Method ◽  
Solidification Process ◽  
Momentum Conservation ◽  
Al Alloy ◽  
System A ◽  
Air Cushion ◽  
Solid Liquid ◽  
Coupled Solution ◽  
Change System

According to the characteristics of solidification process of air cushion continuous casting, and on the basis of continuum model for binary solid-liquid phase change system, a set of equations which include continuity, momentum conservation, energy conservation and solute conservation ones are established. Furthermore, a coupled solution method of the set of equations, in which controlled-volume finite difference method is used and developed. The effects of some typical parameters such as billet diameter, casting speed and the second cooling on the solidification behavior are studied, and some meaningful results, which are significant to the technique optimizing of the air cushion continuous casting, are obtained.

Investigation of a washer embedded in an orbiter vehicle tile

1994 ◽  
Vol 52 ◽  
pp. 654-655
Author(s):  
H. S. Kim ◽  
V. J. Cummings
Keyword(s):  
Phase Analysis ◽  
Air Force ◽  
Thermal Protection ◽  
Space Shuttle ◽  
Lower Surface ◽  
Thermal Protection System ◽  
Protection System ◽  
Kennedy Space Center ◽  
Air Force Base ◽  
Kennedy Space

At NASA’s Kennedy Space Center (KSC), an engineering debris team performs a post-landing inspection of the space shuttle orbiter for debris and for anomalies in the thermal protection system. The areas of inspection and debris sampling include the orbiter windows, lower surface orbiter tiles, reinforced carbon-carbon panels of the orbiter wings, and the external tank (ET)/orbiter umbilicals.On October 18, 1989, the space shuttle Atlantis was launched from launch pad 39B at KSC. Atlantis landed on runway 23 at Edwards Air Force Base, California on October 23, 1989. During the post-landing inspection performed October 23-24, 1989, a washer, approximately 1/2 inch in diameter, was found embedded in one of the lower surface tiles forward of the LH2 ET/orbiter umbilical area. The washer was oriented perpendicular to the airflow, and approximately half of the washer protruded into the aerodynamic flow.The washer was submitted to the NASA KSC microchemistry laboratory for examination and elemental and phase analysis.

Modification of superalloy honeycomb thermal protection system

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Łukasz Brodzik
Keyword(s):  
Thermal Protection ◽  
Thermal Protection System ◽  
Protection System ◽  
Aerodynamic Heating ◽  
Underlying Structure ◽  
Insulation Material ◽  
Content Type ◽  
System A ◽  
Delay Increase ◽  
Commercial Environment

Purpose Paper aims to present problem of aerodynamic heating of a metallic heat shield. The key elements of this construction are metallic layers of superalloy honeycomb, which significantly increase the structure’s resistance to impact. Paper describes the problem of influence of damage size on increase of thermal load. Design/methodology/approach Numerical analysis was performed in a non-commercial environment FreeFem++ using finite element method, and its results were compared with the results given in the literature. Findings In thermal protection system, a modification was used to delay increase in temperature on the underlying structure as well as to reduce its maximum value. Originality/value In the further part of the paper, selected insulation material was modified by adding additional conductive material.

Influence of Structure and Composition of the Fibrous Materials on the Performance Characteristics of Thermal Protection Structures with Combined Functions

2018 ◽  
Vol 284 ◽  
pp. 65-70 ◽  
Author(s):  
I.V. Cherunova ◽  
L. Osipenko ◽  
M. Stenkina
Keyword(s):  
Multilayer Structure ◽  
Thermal Protection ◽  
Fibrous Materials ◽  
Structure And Properties ◽  
Ministry Of Education ◽  
State Technical ◽  
Textile Materials ◽  
Moist Environment ◽  
Protective Structures ◽  
Made In

In the article research results are presented, the aim of which is to provide high quality and reliability while using heat-protective structures for machines and people. Textile materials perform important function contacting moisture in the atmosphere. Results of moist environment textile structure and properties research are also presented here. It was established that multilayer structure with free elementary cells, including knitwear, for the purposes of barrier maintenance of moisture level is not sufficient. Based on the performed experimental research, new characteristics and properties pattern defining behavior of materials while contacting liquids (wetting, capillarity, moisture, hygroscopy) are established. Recommendations relating to groups and samples of textile materials are given. The research was made in Don State Technical University within the framework of State Assignment of the Ministry of education and science of Russia under the project 11.9194.2017/BCh.

scholarly journals Organization Development for Improving Public Enterprises

1976 ◽  
Vol 1 (2) ◽  
pp. 27-40
Author(s):  
Nitish R. De
Keyword(s):  
Organization Development ◽  
Public Enterprises ◽  
The West ◽  
The Past ◽  
System A ◽  
The Future ◽  
Effective System ◽  
Appreciative System ◽  
Work And Life

Organization Development with its process focus, as developed in the West, may not be able to deal with several problems of social reality like alienation from work and life, tension ridden culture of consumerism, effects of future shocks, etc. The picture is complicated in developing countries where bureaucratic‐work orientation with concomitant values and attitudes dominate public enterprises. The need for the establishment of an effective system for the continuous rise in the quality of life is quite important in public enterprises. A new culture has to be developed. There is a need to internalize a larger “appreciative system” with OD strategies in terms of the process and design. This may lead to “eco-system,” a meaningful linkage of the past and the future through the present, an ideal-seeking approach to the future. Such an approach may free 00 from its narrow confines.

scholarly journals TOOLS FOR SETTING UP THE PERSONNEL LABOR MOTIVATION SYSTEM: A REVIEW OF RESEARCH BY RUSSIAN SCIENTISTS AND PRACTITIONERS

2021 ◽  
pp. 41-53
Author(s):  
O.Y. Ponomareva ◽  
◽  
O.U. Nikitina ◽  
Keyword(s):  
Theory And Practice ◽  
Length Of Service ◽  
Motivation System ◽  
System A ◽  
Compensation Package ◽  
Effective System ◽  
Strategic Goals ◽  
Sustainable Competitive Advantages ◽  
Analysis Models ◽  
Stimulation Of

This paper provides an overview of modern theoretical and practical approaches to the systems of motivation and stimulation of the work of the personnel. The main focus is on the works of Russian researchers within the last decade. The relevance of this study is due to the lack of such reviews in scientific sources, as well as the possible comparison of the achievements of theory and practice in order to create an effective system of staff labor motivation. The purpose of this study is to analyze modern approaches in theory and practice to the content of labor motivation and incentive systems, the mechanism of labor motivation and the selection of the most effective “tools for tuning” the system of labor motivation and incentives. The research methods used in this study include analysis, systematization and generalization of the published approaches of researchers and practitioners, including copyright research, for the period from 2012 to 2020, presented in academic journals and monographic sources. The results of the study were systematized by the authors in three areas of analysis: models and systems of motivation and incentives for personnel and the composition of their elements; approaches to studying mechanisms of motivation and stimulation of labor, guiding the labor behavior of employees; experience of a differentiated approach to managing labor motivation. Systematization and generalization of the approaches made it possible to single out the “tuning tools” of the system of motivation and stimulation of labor and to define the concept. Moreover, it helped to compile the list of such tools, including: monitoring the need-motivational sphere and job satisfaction, studying the dynamics of the employee’s motivational profiles for making and changing management decisions; application of a flexible incentive system, taking into account the differentiation of incentives by gender, age, length of service, job positions of personnel in the company; providing an employee with a choice of a compensation package from the enterprise’s cafeteria. These customization tools guide managers towards a targeted approach to personnel, combining the efforts of management at different levels to align labor motivation with the strategic goals of the company. The authors argue that a timely use and alternation of the tools for setting up and tuning the labor motivation system, focusing on the urgent needs of personnel, allows to change the company’s motivational strategy creating sustainable competitive advantages which are necessary in modern economic realities.

scholarly journals Heat Transfer and Failure Mode Analyses of Ultrahigh-Temperature Ceramic Thermal Protection System of Hypersonic Vehicles

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Tianbao Cheng ◽  
Weiguo Li ◽  
Wei Lu ◽  
Yushan Shi
Keyword(s):  
Heat Transfer ◽  
Tensile Stress ◽  
Compressive Stress ◽  
Thermal Protection ◽  
Lower Surface ◽  
Thermal Protection System ◽  
Protection System ◽  
Hypersonic Vehicles ◽  
Middle Plane ◽  
Ultrahigh Temperature

The transient temperature distribution of the ultrahigh-temperature ceramic (UHTC) thermal protection system (TPS) of hypersonic vehicles is calculated using finite volume method. Convective cooling enables a balance of heat increment and loss to be achieved. The temperature in the UHTC plate at the balance is approximately proportional to the surface heat flux and is approximately inversely proportional to the convective heat transfer coefficient. The failure modes of the UHTCs are presented by investigating the thermal stress field of the UHTC TPS under different thermal environments. The UHTCs which act as the thermal protection materials of hypersonic vehicles can fail because of the tensile stress at the lower surface, an area above the middle plane, and the upper surface as well as because of the compressive stress at the upper surface. However, the area between the lower surface and the middle plane and a small area near the upper surface are relatively safe. Neither the compressive stress nor the tensile stress will cause failure of these areas.

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