scholarly journals Modification of activated carbons for application in adsorption cooling systems

2019 ◽  
Vol 1 (22) ◽  
pp. 87-98
Author(s):  
Eliza Wolak ◽  
Elżbieta Vogt ◽  
Jakub Szczurowski
Keyword(s):  
Chemical Modification ◽  
Activated Carbons ◽  
Thermal Capacity ◽  
Raw Material ◽  
Cooling Systems ◽  
Heat Of Wetting ◽  
Chemical Agents ◽  
Hydrophobic Materials ◽  
Relationship Of ◽  
The Relationship

In this paper commercially available activated WD-extra carbon (Gryfskand) which is applied for water treatment was used. Activated carbon was modified by the following chemical agents: H2O2, HNO3 and HCl. Chemical modifications significantly affect the chemical, structural and surface properties of activated carbons. Hydrophobization with ethereal stearic acid was performed on the raw material and samples after chemical modification. Hydrophobic properties of the samples were specified. The relationship of the chemical modification agents with hydrophobization degree was indicated. The thermal effects of wetting by methanol was measured. The heat of wetting was calculated. The purpose of the work was to modify the WD carbon properties to obtain an adsorbent for cooling systems characterized by both good thermal capacity and moisture resistance. The modifying chemical substances applied accounted for an increase in the concentration of the acid functional groups. The hydrophobized and HCl-modified WD(HCl) carbon has the best hydrophobized properties. The results of studies describing such modifications allow to conclude that the use of hydrophobic materials may lead to the production of sorbents with new functions facilitating their storage and use.

Experimental Study on Adsorption of Gasoline Vapor on Activated Carbon at High Concentration

2013 ◽  
Vol 807-809 ◽  
pp. 549-552 ◽  
Author(s):  
Chen Lu Zhao ◽  
Wei Qiu Huang ◽  
Ying Xia Wang ◽  
Li Shi
Keyword(s):  
Temperature Rise ◽  
Activated Carbons ◽  
Thermodynamic Characteristics ◽  
High Concentration ◽  
Vapor Adsorption ◽  
Gasoline Vapor ◽  
Adsorption Capacities ◽  
Bed Temperature ◽  
Relationship Of ◽  
The Relationship

Dynamic and thermodynamic characteristics of gasoline vapor adsorption at 0.3 mol/mol on different activated carbons (ACs) were investigated. The adsorption capacities of AC1 and AC3 were 0.295 g/g and 0.189 g/g at 20 oC, and 0.284 g/g and 0.165 g/g at 30 °C, respectively. Bed temperature rise was up to 50°C to 60°C in the adsorption of gasoline vapor at 0.3 mol/mol.The heat effect formula for high concentration vapor adsorption was deduced to evaluate the relationship of the adsorption capacity of the activated carbons, the mole fraction of the inlet gasoline vapor, the recovery efficiency of the gasoline vapor with the temperature rise.

The (re-)establishment of order: Disorder in the priestly understanding and in the teaching and acts of Jesus

2017 ◽  
Vol 114 (2) ◽  
pp. 166-175
Author(s):  
Mark E. Biddle
Keyword(s):  
Skin Diseases ◽  
Christian Theology ◽  
Raw Material ◽  
Objective Quality ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Concrete Reality ◽  
Legal Sense

While a biblical doctrine of sin requires the honest and careful assessment of the complexity and plurality of the biblical witness,2 especially with regard to the relationship of the two Testaments, scholarship often draws lines of demarcation between the two Testaments too sharply. Ancient Israel’s priests devoted significant attention to the “objective” quality of wrong done as a pastoral problem, for example. Leviticus establishes that “unintentional sin” covers the whole gamut of behaviors short of willful sin that can result in terrible injury and harm. Indeed, the priests so consistently held the notion that wrong inheres in a situation, regardless of the intention of the actor, that they could use the language of sin to discuss skin diseases (Lev 14:1–32) and mold in houses (Lev 14:33–53). Israel’s priests did not speculate as to the precise point along the spectrum of willfulness and inadvertence at which one becomes morally culpable in the legal sense. Instead, their approach was much more pastoral: whatever the psychological and ethical dynamics preceding and underlying a wrong, the priests saw their role primarily in terms of healing, restoration, and restitution. Jesus and James expanded the priestly notion of sin as an objective reality to include intention as a category in the discussion of sin, but did not make it definitive of sin. Although the Gospels preserve no other discourse of Jesus even impinging on the subject of the concrete reality of sin, Jesus’ behaviors, especially instances when he healed without assigning blame or seeking repentance first, manifest his priestly concern for correcting inherent wrongness, for restoring rightness. Following Jesus, the priests’ view that any disorder threatens the harmony of the cultic community can supply useful and pertinent raw material for Christian theology and ethics today.

scholarly journals The Relationship of Nutritive Value of Condensed Fish Solubles to Quality of Raw Material

1949 ◽  
Vol 28 (1) ◽  
pp. 134-140 ◽  
Author(s):  
S. Lassen ◽  
E.K. Bacon ◽  
H.J. Dunn
Keyword(s):  
Nutritive Value ◽  
Raw Material ◽  
Relationship Of ◽  
The Relationship

scholarly journals Chemical basis for beef charqui meat texture

2007 ◽  
Vol 50 (4) ◽  
pp. 719-724 ◽  
Author(s):  
Elza Y. Youssef ◽  
Carlos Eduardo Rocha Garcia ◽  
Fábio Yamashita ◽  
Massami Shimokomaki
Keyword(s):  
Mathematical Modeling ◽  
Chemical Composition ◽  
Moisture Content ◽  
Shear Force ◽  
Vastus Lateralis ◽  
Fold Increase ◽  
Raw Material ◽  
Water Molecules ◽  
Relationship Of ◽  
The Relationship

This work evaluated the relationship of charqui meat (CHM) chemical composition with the tenderness throughout its production. CHM was prepared from beef Vastus lateralis of 4-5 years old. Shear force of fresh CHM showed an approx. 3-fold increase in toughness compared to the raw material while, in the case of cooked CHM it was 6-fold increased in relation to the raw charqui. The moisture content decreased by 39.0 and 58.0% (p<0.05) for uncooked and cooked CHM, respectively, in relation to the raw material. Mathematical modeling of the influence of these meat components showed that shear force increased exponentially with the loss of moisture. The texture of CHM was the result of a multitude of factors involving myofibril proteins which promoted dynamic biochemical events such as the binding of water molecules. It was the amount of the latter which ultimately determine the final charqui meat texture.

The relationship of phase and chemical compositions of a durable ceramic material of the fortification wall of the city of Thessaloniki (Greece) age more than 1000 years

2020 ◽  
pp. 56-59
Author(s):  
E. S. Abdrakhimova ◽  
V. Z. Abdrakhimov
Keyword(s):  
Ceramic Material ◽  
Glass Phase ◽  
Raw Material ◽  
Chemical Compositions ◽  
Element Analysis ◽  
Ceramic Shard ◽  
Alkali Oxides ◽  
Relationship Of ◽  
The Relationship ◽  
The City

A ceramic material with an age of more than 1000 years has been studied. Plinth was used as a ceramic material for the construction of the fortress wall. In addition, the element analysis determined an increased content of carbon in the samples - 9,50 %. Increased carbon content in inclusions indicates the introduction of fuel into the raw material. The introduction of fuel into the raw material not only increases the porosity of the products, but also contributes to the uniform sintering of the ceramic shard and with an increased content of alkali oxides (R2O > 4 %), the formation of a glass phase up to 1000 oC.

scholarly journals FAKTOR-FAKTOR YANG MEMPENGARUHI NILAI PRODUKSI INDUSTRI PERABOT DI KECAMATAN JEUMPA KABUPATEN BIREUN

2019 ◽  
Vol 8 (2) ◽  
pp. 48
Author(s):  
Agus Susanti ◽  
Devi Andriyani
Keyword(s):  
Regression Analysis ◽  
Linear Regression Analysis ◽  
Secondary Data ◽  
Multiple Linear Regression Analysis ◽  
Raw Material ◽  
Furniture Industry ◽  
Investment Value ◽  
Production Value ◽  
Relationship Of ◽  
The Relationship

This study aims to analyze the Factors that Influence the Value of Furniture Industry Production in the Sub-district of Jeumpa District Bireuen in 2017. The data used in this study is secondary data. The method use to analyze the relationship of the dependent variable independently is the method of multiple Linear Regression Analysis. The results of the research are partially Labor and Investment Value have a positive and significant effect on the Value of Furniture Industry Production in the Sub-district of Jeumpa District Bireuen. Raw Material costs do not affect the Value of Furniture Industry Production in the Sub-district of Jeumpa District Bireuen. Simultaneously Labor, Investment Value and Raw Material Cost have a positive and significant effect on the Production Value of the Bireuen district of Jeumpa Sub-district Funiture Industry. The amount of influence is equal to 0,6080 or 60,80% . While the rest is influenced by other variables outside the model at 39,20 %.

scholarly journals Global problems of the world – structure, urgency

2008 ◽  
Vol 54 (No. 2) ◽  
pp. 63-70
Author(s):  
V. Jeníček
Keyword(s):  
Complex Problem ◽  
Raw Material ◽  
Common Denominator ◽  
War And Peace ◽  
Economic Changes ◽  
The Social ◽  
Global Problems ◽  
Nutrition Problem ◽  
Relationship Of ◽  
The Relationship

Global problems are very different. The division of global problems into three big groups: Inter-social global problems usually included the problems like the problem of diverting world wars, nuclear, eventually other conflicts connected to the problematic of armament (the problem of war and peace). At present, there gains in importance also the fight towards terrorism. The problem of the social and economic backwardness of developing countries, eventually the whole North-South relationship also belong there, as well as the problem of solving global debts, the relationship of the indebted and creditors. The problem of the international relationships (namely economic) changes under the new conditions formed namely by the scientific and technological progress. Into the second group of natural-social global problems, there are most often included the following problems: environmental problem, raw material and energy problem, population problem, food, respectively nutrition problem. Lastly, the third group of anthropo-social problems includes the general human problems of the social, cultural and humanitarian-ethical nature. Sometimes, they are ranked as one great complex problem (so-called problem of the future of man), sometimes this group is divided into a number (10–15) of partial “sub-global” problems the common denominator of which are the shortcomings of the development of man in the relationship to the life and social conditions created by himself. Here belong different kinds of the unequal approach to education, health care, housing, culture, human rights, eventually also serious defects in their securing or a disharmonic and uncontrolled development (e.g. accelerated urbanisation) etc.

scholarly journals Chert procurement in Corsica during the Neolithic: Inferring social territories in the Tyrrhenian islands

2021 ◽  
Vol 7 (2) ◽  
Author(s):  
Céline Leandri ◽  
Paul Fernandes
Keyword(s):  
Raw Material ◽  
Italian Peninsula ◽  
Lithic Assemblages ◽  
Surrounding Areas ◽  
Relationship Of ◽  
The Relationship ◽  
Non Destructive

From the Neolithic, foreign siliceous materials were imported into Corsica as the island lacks local chert and obsidian. Such a context constitutes a real opportunity to investigate the relationship of the island with surrounding areas, in perspective with cultural evolutions. For 20 years, chert sourcing studies were carried out. We took into account 26 sites, dating from the Ancient Neolithic to the Final Neolithic. The work is based on non-destructive petro-archaeological observations of the artefacts. and on the survey and characterization of Sardinian sources (320 samples collected and 60 different lithotypes characterized). The study aims to better understand the place of chert among the lithic assemblages throughout time and identify the provenance of most of the chert material introduced into Corsica. It reveals procurement evolution in terms of preferred facies and of stages of introduction, depending on the chronology and geographical situation of the sites. The results confirm connections with Sardinia, among which Perfugas basin constitutes a major source of raw material for Corsica. It also shows relations with the Italian Peninsula for some Middle Neolithic sites in Northern Corsica. Comparisons with data from Sardinia show the affinities and differences between the two islands and open further avenues for research.

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