Laboratory Critical Experiment Simulating Long-Term Exposure to External Environment: A Hollow Brick Block with Mineral-Wool-Fiber Cavity Filler

A consequence of a loss of coolant accident is that the local insulation material is damaged and maybe transported to the containment sump where it can penetrate and/or block the sump strainers. An experimental and theoretical study, which examines the transport of mineral wool fibers via single and multi-effect experiments is being performed. This paper focuses on the experiments and simulations performed for validation of numerical models of sedimentation and resuspension of mineral wool fiber agglomerates in a racetrack type channel. Three velocity conditions are used to test the response of two dispersed phase fiber agglomerates to two drag correlations and to two turbulent dispersion coefficients. The Eulerian multiphase flow model is applied with either one or two dispersed phases.

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Study on the effect of hybrid fiber length on tensile strength of sealing composites

Journal of Engineered Fibers and Fabrics ◽

10.1177/1558925020968226 ◽

2020 ◽

Vol 15 ◽

pp. 155892502096822

Author(s):

Li Yuxian ◽

Liu Meihong ◽

Sun Junfeng ◽

Wang Juan ◽

Tian Shuo

Keyword(s):

Tensile Strength ◽

Fiber Length ◽

Uniform Design ◽

Cellulose Fiber ◽

Mineral Wool ◽

Interfacial Bonding ◽

Wool Fiber ◽

Pulp Fiber ◽

Hybrid Fiber ◽

Mineral Wool Fiber

The present paper aims at investigating the relationship between fiber length of hybrid fibers and the tensile strength of sealing composite materials. First, three kinds of fibers: cellulose fiber, aramid pulp fiber, and mineral wool fiber were sieved and their weight-average length was measured. Second, a uniform design method of U8 (43) was adopted to prepare sealing composites by the beater-addition process, and the properties of the tensile strength of the composite were examined. In the end, the relation model was concluded and verified using multi-linear regression analyzation and was further analyzed using micro mechanic theory and interfacial bonding mechanism. The results show that the regression equation can be used to estimate the tensile strength of composites with different hybrid fiber lengths. The tensile strength increased corresponding to the increase of the length of the cellulose fiber but decreased with the increase of the length of aramid pulp and mineral wool fiber. Particularly the fiber length of aramid pulp fiber had the most significant effect on tensile properties. The cases were decided by the comprehensive effects of fibers dispersion, interfacial bonding, and micromechanics.

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Fabrication Characteristics of Mineral Wool Fiber Used the Waste

Materials Science Forum - Eco-Materials Processing & Design VII ◽

10.4028/0-87849-995-4.602 ◽

2006 ◽

pp. 602-605

Author(s):

Ki Hwan Kang ◽

Sang Youl Kim ◽

Yong Su Um ◽

Bo Young Hur

Keyword(s):

Mineral Wool ◽

Wool Fiber ◽

Mineral Wool Fiber

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Fabrication Characteristics of Mineral Wool Fiber Used the Waste

Materials Science Forum ◽

10.4028/www.scientific.net/msf.510-511.602 ◽

2006 ◽

Vol 510-511 ◽

pp. 602-605

Author(s):

Ki Hwan Kang ◽

Sang Youl Kim ◽

Yong Su Um ◽

Bo Young Hur

Keyword(s):

Sandwich Panel ◽

Mineral Wool ◽

Wool Fiber ◽

Face Sheet ◽

Functional Effect ◽

Organic Form ◽

Curing Conditions ◽

Mineral Wool Fiber ◽

Good Environment

The development of mineral wool core sandwich panel depends on the reaction of resin on mineral wool and face sheet. The most important factors in developing the mineral wool core are optimization of the Curing system and density of the used resin. In addition, this product considers the functional effect and good environment instead of organic form core. This paper studied the curing conditions, the density of used resin, and the functional effect after manufacturing the mineral wool core.

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A Multi-Attribute Decision Method under Uncertainty Environment Conditions—The Green Supplier Evaluation Perspective

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph18010344 ◽

2021 ◽

Vol 18 (1) ◽

pp. 344

Author(s):

Hao Xu ◽

Liuxin Chen ◽

Qiongfang Li ◽

Jianchao Yang

Keyword(s):

Environmental Pollution ◽

Evaluation Method ◽

External Environment ◽

Environmental Indicators ◽

Supplier Evaluation ◽

Uncertain Environment ◽

Green Suppliers ◽

Uncertainty Environment ◽

Selection Of

Due to the continuous changes of political environment, consumption habits, technological progress and other factors, the external environment of enterprises is full of uncertainty. The turbulence of external environment is not conducive to the long-term operation and development of enterprises, but also brings great challenges to the selection of suppliers. This makes the competition of enterprises focus on how to choose long-term cooperation suppliers in the uncertain external environment. In addition, due to the deterioration of the global environment, governments pay more and more attention to environmental pollution, and consumers are more and more inclined to green consumption, which makes many companies pay more and more attention to environmental indicators when selecting suppliers. In the case of external environment turbulence and serious environmental pollution, the evaluation and selection of green suppliers in uncertain environment is particularly important for the long-term development of enterprises. What’s more, when the supplier’s capability gap is small, the decision-maker often hesitates among several suppliers. In this paper, the hesitant fuzzy is used to describe the hesitant psychology of decision-makers in selecting suppliers, the variance fluctuation is used to describe the characteristics of hesitant fuzzy numbers, and the probability is used to measure the uncertainty of the environment. A green supplier evaluation model under the uncertainty environment is proposed, which comprehensively evaluates the green suppliers under the uncertain environment. Furthermore, it is compared with other methods that do not consider the uncertainty and the adaptability of evaluation method and right confirmation method, so as to reflect the influence of uncertainty to green supplier evaluation and the importance of adaptability of evaluation method and right confirmation method.

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Experimental Study on the Drying Performance of the High Temperature Heat Pump Dryer

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.550-553.3219 ◽

2012 ◽

Vol 550-553 ◽

pp. 3219-3223

Author(s):

Xing Wang Zhu ◽

Chun Xia Hu ◽

Zhi Min Guo ◽

Yu Gui Su

Keyword(s):

High Temperature ◽

Heat Pump ◽

External Environment ◽

Stable Operation ◽

Obvious Effect ◽

Electromagnetic Valve ◽

Exhaust Temperature ◽

Temperature Heat ◽

High Temperature Heat Pump

In this paper，a high temperature heat-pump dryer and a corresponding semi-enclosed test drying room for using the dryer are built up respectively. While the average dry bulb of the external environment is 25°C and the relative humidity is 55%, the performance of the dryer is obtained when the dryer is running continuously for five hours. The results show that: the electromagnetic valve-capillary institution has an obvious effect on the lower the dryer exhaust temperature. It makes the suction temperature of compressor dropped 10 °C~15 °C, which can reduce the exhaust temperature and prevent compressor’s overheating. When the exhaust temperature keep at 100~110 °C, it can not only guarantee the temperature of wind coming from the dryer is high, but also can make sure the drying system’s long-term stable operation.

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Ubuntu and Educational Leadership

Advances in Religious and Cultural Studies - Understanding Ubuntu for Enhancing Intercultural Communications ◽

10.4018/978-1-7998-7947-3.ch016 ◽

2021 ◽

pp. 202-214

Author(s):

Charles Bryan Davis

Keyword(s):

Educational Leadership ◽

Case Studies ◽

Local Population ◽

External Environment ◽

Educational Leaders ◽

Strong Sense ◽

Mutual Dependence ◽

External Stakeholders

Ubuntu has implications that extend beyond the boundaries of the organization, promoting a strong sense of mutual dependence with the community. For educational leaders, Ubuntu implies strong connections with parents of students as well as the entire local population. The author of this chapter is an American who has worked in Senegal for 25 years and learned about Ubuntu in the context of educational leadership. Using enacted environment theory as a theoretical lens, this chapter uses four short case studies that illustrate how the author learned what educational leaders do to enact an environment for their schools in which Ubuntu values are evident. The lesson drawn from these accounts is that the value of external stakeholders must be seen with a long-term lens, and the dividends these relationships pay elude Western ideas of management. These case studies also identify concrete advantages that the external environment can provide for a school when its leaders have enacted the values of Ubuntu.

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Adaptation of mammalian protein metabolism to amino acid supply

Proceedings of The Nutrition Society ◽

10.1017/s0029665100100126 ◽

1969 ◽

Vol 28 (02) ◽

pp. 215-225

Author(s):

Hamish N. Munro

Keyword(s):

Amino Acid ◽

Protein Metabolism ◽

External Environment ◽

The Body ◽

Metabolic Adaptation ◽

Internal Factors ◽

Physiological Adaptations ◽

Essential Nutrient ◽

Mammalian Protein

The metabolism of the animal is equipped to adapt to changes in both the internal and the external environment. Among internal factors are activity versus rest and sleep, and the menstrual cycle in the case of the female. Metabolism must also respond to variations in the external environment, such as heat and cold, and notably the availability of food. Metabolic adaptation to nutrient supply is of two kinds. First, there are transient physiological adaptations to the intermittent intake of nutritionally adequate meals. These short-lived adaptations account for a large part of the diurnal variations that have been observed in the protein metabolism of mammals (Wurtman, 1969). Secondly, long-term adaptive reactions occur when there is a decrease in availability of an essential nutrient in the diet. Under such circumstances, tissue constituents are lost to varying degrees from different parts of the body. It is proposed to discuss here mainly short-term physiological adaptations to variations in amino acid supply and their relevance to the needs of the body for dietary protein. Adaptive changes resulting from long-term protein deficiency are considered in the paper by Waterlow & Stephen (1969).

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The Effect of Acidity Coefficient on Crystallization Behavior of Blast Furnace Slag Fibers

High Temperature Materials and Processes ◽

10.1515/htmp-2015-0280 ◽

2018 ◽

Vol 37 (1) ◽

pp. 33-37

Author(s):

Tie-Lei Tian ◽

Yu-Zhu Zhang ◽

Hong-wei Xing ◽

Jie Li ◽

Zun-Qian Zhang

Keyword(s):

Thermal Stability ◽

Crystallization Kinetics ◽

Blast Furnace Slag ◽

Chemical Structure ◽

Crystallization Behavior ◽

Three Dimensional ◽

Mineral Wool ◽

Mineral Wool Fiber ◽

Kinetics Of ◽

Furnace Slag

AbstractThe chemical structure of mineral wool fiber was investigated by using Fourier Transform Infrared Spectroscopy (FTIR). Next, the glass transition temperature and the crystallization temperature of the fibers were studied. Finally, the crystallization kinetics of fiber was studied. The results show that the chemical bond structure of fibers gets more random with the increase of acidity coefficient. The crystallization phases of the fibers are mainly melilites, and also a few anorthites and diopsides. The growth mechanism of the crystals is three dimensional. The fibers with acidity coefficient of 1.2 exhibit the best thermal stability and is hard to crystallize as it has the maximum aviation energy of crystallization kinetics.

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Detecting Technology for External Anticorrosive Coating Defects of Buried Pipelines

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.615.165 ◽

2014 ◽

Vol 615 ◽

pp. 165-168

Author(s):

Xing Zheng He

Keyword(s):

Data Analysis ◽

External Environment ◽

Buried Pipelines ◽

Basic Principles ◽

Anticorrosive Coating ◽

Running Safety ◽

Periodic Inspection ◽

On Line ◽

Line Defects

The external anticorrosive coating is the shelter for preventing buried steel pipelines from corrosive damage. Many pipelines face severe corrosive problems because of the performance decrease of the coating, especially during long-term services. This situation usually causes safety accidents. Periodic inspection to the coating is an important way to ensure running safety. Aimed at the detecting technology, the methods for locating the pipelines and the means of on-line defects detecting with no excavation for the coating were studied and introduced. The ways for direction detecting, depth measuring and location coordinates detecting were pointed out. The basic principles of data analysis were also outlined. The various influences coming from external environment factors to the detecting results were analyzed.

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