scholarly journals Effective polymer concrete on waste concrete production

2019 ◽  
Vol 97 ◽  
pp. 02032
Author(s):  
Evgeny Pyataev ◽  
Alexey Zhukov ◽  
Kirill Vako ◽  
Marina Burtseva ◽  
Elizaveta Mednikova ◽  
...  
Keyword(s):  
Average Density ◽  
Polymer Concrete ◽  
Polymer Additive ◽  
Highly Active ◽  
Active Experiment ◽  
High Durability ◽  
Concrete Production ◽  
Building Systems ◽  
Active Waste ◽  
Selection Of

Finish materials in facade systems are experiencing significant stress associated with atmospheric and mechanical influences. The use of tiles with high durability and the ability to relax deformations will allow to obtain efficient cladding for building systems. The article presents the results of the selection of compositions and technologies of a composite material based on finely ground highly active waste produced by portland cement, mineral binder, additives based on polycarboxylic ether MC-6955, and polymer additive MC-Adhesive. MC-Adhesive is a polymer additive used for: a significant increase in flexural strength; reduce the elastic modulus; increase water resistance; increase the concrete mix cohesion; making coatings with high requirements for abrasion, low dusting and high resistance to aggressive substances.The article presents the results of research methods of selection of compositions of composite polymer concrete. The strength characteristics of polymer concrete with an average density of 2370-2450 kg/m3 are most dependent on the consumption of fine waste and polymer additives. The nomogram obtained as a result of an active experiment makes it possible to evaluate the dependence of the strength on these factors and select their optimal ratio.

Effect of Cyclic Exposure of Chemicals on Compressive Strength of Polyester Resin Based Polymer Concrete

2013 ◽  
Vol 687 ◽  
pp. 185-190 ◽  
Author(s):  
Masoud Jamshidi ◽  
Mohammad Javad Ghasemi ◽  
Abdolreza Hashemi
Keyword(s):  
Compressive Strength ◽  
Construction Industry ◽  
Polyester Resin ◽  
Unsaturated Polyester ◽  
Concrete Structures ◽  
Polymer Concrete ◽  
Acid Solutions ◽  
Gas Oil ◽  
Demineralized Water ◽  
Concrete Production

Polymer concretes (PC) were introduced to building and construction industry more than 50 years ago. Gradually, they became a suitable substitute for concrete structures. Their superior properties againt aggresives introduced them as a good overlay for concrete structures; however, their application was shortly diminished due to the higher costs. In this research a homemade cost-quality effective resin (unsaturated polyester) is used as binder in the polymer concrete production. Polymer concrete specimens were evaluated for compressive strength and its fluctuation due to cyclic exposure to different aggresive solutions (sulfuric acid, nitric acid, citric acid, chloridric acid, sodum sulfate, water, demineralized water, sodium hydroxid, potasium hydroxid and gas oil). It was found that PC specimens degraded more in alkali conditioned in comparison to acid solutions.

scholarly journals Efficient CRISPR/Cas9-mediated biallelic gene disruption and site-specific knockin after rapid selection of highly active sgRNAs in pigs

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Xianlong Wang ◽  
Jinwei Zhou ◽  
Chunwei Cao ◽  
Jiaojiao Huang ◽  
Tang Hai ◽  
...  
Keyword(s):  
Gene Disruption ◽  
Site Specific ◽  
Highly Active ◽  
Selection Of

scholarly journals Biologically Active Aldehydes In Extracts Of Lactarius Pergamenus (Fr.) Fr Fresh Fruiting Bodies

2020 ◽  
Vol 15 (3) ◽  
pp. 125-131
Author(s):  
V.O. Antonyuk ◽  
L.V. Panchak ◽  
M.V. Tsivinska ◽  
R.S. Stoika
Keyword(s):  
Thin Layer ◽  
Aromatic Amines ◽  
Methylene Chloride ◽  
Biologically Active ◽  
Fruiting Bodies ◽  
Highly Active ◽  
Vegetable Kingdom ◽  
Methylene Chloride Extract ◽  
Colored Compound ◽  
Selection Of

The biologically active aldehydes in extracts of fungi of the genus Lactarius were identified. It’s established that these substances are unstable, they are found in fresh and frozen fungi, but are absent in dried mushrooms and interact with 1,4-phenylenediamine to form a colored compound. Methylene chloride is the best extragent for these substances. TLC on silufol plates showed that there were several substances in Lactarius pergamenus fruiting bodies and they had varying degrees of stability. For selection of these substances, methylene chloride extract was separated on a column of silica gel. Fraction, which gave the most expressive reaction with 1,4-phenylenediamine on thin-layer chromatograms were analyzed by GC-MS both in the absence and in the presence of 1,4-phenylenediamine. As a result, it was found that 1,4-phenylenediamine or other aromatic amines interacted with highly active aldehydes, that were present in fruiting bodies. Among them 2,2-dimethylocta- 3,4-dienal was the most stable and was present in the biggest quantity. This substance very rarely occurs in the vegetable kingdom and in fungi extracts of Lactarius genus wasn’t previously described. Its possible function in fungi is prevention of damage by parasites and eating by animals.

scholarly journals РАЗРАБОТКА ВЫСОКОАКТИВНОГО ШТАММА-ПРОДУЦЕНТА ВИРДЖИНИАМИЦИНА И ПОВЫШЕНИЕ ЕГО ПРОДУКТИВНОСТИ С ПОМОЩЬЮ СИНТЕТИЧЕСКИХ АБСОРБИРУЮЩИХ СМОЛ

2016 ◽  
Vol 6 (3) ◽  
pp. 195-208 ◽  
Author(s):  
V. A. Savushkin ◽  
V. V. Dzhavakhiya ◽  
E. V. Glagoleva ◽  
V. V. Savel'eva ◽  
E. D. Popova ◽  
...  
Keyword(s):  
Fermentation Medium ◽  
Culture Broth ◽  
Medium Composition ◽  
Basic Medium ◽  
High Productivity ◽  
Highly Active ◽  
Different Types ◽  
Total Productivity ◽  
Industrial Use ◽  
Selection Of

<p>Virginiamycin, an antibiotic produced by some <em>Streptomyces</em> species, is widely used in veterinary and bioethanol production. It represents a natural mix of two different macrocyclic components, among which M1 and S1 factors are the main acting components. M1 and S1 act synergistically when present in the optimum ratio of 60-75% of M1 and 25-40% of S1. Due to a large number of genes involved into the virginiamycin biosynthesis, the development of overproducing strains able to synthesize M1 and S1 at a synergistic ratio with the total productivity exceeding 3-4 g/L still remains a relevant problem. Using a multi-step random UV mutagenesis of the <em>Streptomyces</em> sp. strain DSM40559, a highly active strain S 15-30 was obtained, which virginiamycin titer on a basic medium significantly increased that of the parental strain (2.6 and 0.35 g/L, respectively), and the M1:S1 ratio remained synergistic (72:28). Various sources of carbon, nitrogen, and macroelements were evaluated for medium improvement, and several different types of synthetic macroporous resins were tested to provide the highest virginiamycin titer in culture broth of the developed strain. The resulting improved fermentation medium supplemented with 20 g/L of Amberlite XAD-16 resin increased strain productivity up to 5.03 ± 0.12 g/L with the simultaneous maintenance of the M1:S1 ratio within the synergistic range (72:28) and highly selective level of adsorption of the antibiotic from culture broth (92-95%). The variability of the M1:S1 ratio in the total antibiotic titer depending on various medium composition and resin type was first demonstrated. The obtained strain is promising for the industrial use due to its high productivity and the optimal M1:S1 ratio. Results of the study will be used for the further selection of overproducing strains and the scaling up of the virginiamycin production. The obtained data can be interesting for other researchers working in the field of production of macrolide antibiotics.</p>

scholarly journals Determination of fundamental criteria in the selection of a construction system

2020 ◽  
Vol 157 ◽  
pp. 06025 ◽  
Author(s):  
Mukhammet Fakhratov ◽  
Sergey Sinenko ◽  
Mohammad Akbari ◽  
Farid Asayesh
Keyword(s):  
Construction Industry ◽  
Statistical Tests ◽  
Decision Makers ◽  
Construction Methods ◽  
Building Systems ◽  
Social Environmental ◽  
Selection Of ◽  
Modern Building ◽  
Comprehensive Study

There is a lack of an efficient systematic approach to the selection of appropriate construction methods for modern building systems. Identifying key criteria is necessary to help decision-makers in implementing the principles of this process. The present article was conduct for the same purpose. In this article, after reviewing of the literature, we found that construction experts’ opinions did not consider until now. Thus, we considered the opinion of experts in the field of the construction industry (Technical and executive specialists of the Afghanistan’s Ministry of Urban Development and Housing, Technical and executive specialists of the Kabul Municipality and Omran Houlding Group). For identifying key criteria, “64” criteria have been extracted that affect the selection of modern building systems and are classified into “six” economic, qualitative, social, environmental, executive and technical groups. A comprehensive study conducted through the distribution of questionnaires. The collected data were analysed using SPSS statistical software; the main criteria ranked by using “Friedman’s statistical test”. Based on the results of statistical tests, 18 criteria were determined and ranked as fundamental criteria. Therefore, paying attention to these criteria for the selection of appropriate construction methods for modern building systems can help experts in the country of Afghanistan.

A Cu2Se–Cu2O film electrodeposited on titanium foil as a highly active and stable electrocatalyst for the oxygen evolution reaction

2018 ◽  
Vol 54 (39) ◽  
pp. 4979-4982 ◽  
Author(s):  
Hu Chen ◽  
Yan Gao ◽  
Lu Ye ◽  
Yanan Yao ◽  
Xuyang Chen ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Current Density ◽  
Oxygen Evolution Reaction ◽  
Titanium Foil ◽  
Catalytic Current ◽  
Cathodic Electrodeposition ◽  
Carbonate Buffer ◽  
Highly Active ◽  
High Durability ◽  
Cu2o Film

Cu2Se–Cu2O/TF electrode prepared via a simple and fast cathodic electrodeposition method. The electrode achieved a catalytic current density of 10 mA cm−2 for the OER at relatively low overpotential of 465 mV in 0.2 M carbonate buffer (pH = 11.0) and displayed a high durability over 20 h.

Selection of Concrete Production Facility Location Integrating Fuzzy AHP with TOPSIS Method

2012 ◽  
Vol 1 (1) ◽  
pp. 40-59 ◽  
Author(s):  
Golam Kabir ◽  
Razia Sultana Sumi
Keyword(s):  
Facility Location ◽  
Fuzzy Ahp ◽  
Facility Location Problem ◽  
Strategic Decision ◽  
Production Facility ◽  
Topsis Method ◽  
Location Selection ◽  
Concrete Production ◽  
Public And Private Sector ◽  
Selection Of

Evaluation and selection of a concrete production facility location is an important strategic decision making problems for both the public and private sector. The multi-dimensional, multi-criteria nature of the concrete production facility location problem limits the usefulness of any particular single objective model. In this study, social, economical, technological, environmental, and transportation factors and sub criteria have been derived to make the optimal concrete production facility location selection decision more realistic and effectual. This study shows an improved and appropriate concrete production facility location evaluation and selection model has been developed by integrating Modified Delphi and Fuzzy Analytic Hierarchy Process (FAHP) with Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS) method. An example is presented to show applicability and performance of the proposed methodology followed by a sensitivity analysis to discuss and explain the results.

Production of High Strength Pastes, Mortars, and Concretes

1984 ◽  
Vol 42 ◽  
Author(s):  
Ramon L. Carrasquillo
Keyword(s):  
High Strength Concrete ◽  
Heterogeneous Material ◽  
High Strength ◽  
Materials Selection ◽  
Cement Pastes ◽  
Relative Contribution ◽  
Concrete Production ◽  
Conventional Production ◽  
Production Techniques ◽  
Selection Of

AbstractFor concrete, a grossly heterogeneous material, guidelines for selection of materials for its production, especially high strength concrete, should consider the interactions of its different components under load. Materials selection and production techniques for achieving concretes, mortars and cement pastes with strengths in excess of 10,000 psi are discussed. Emphasis is placed on the production of concretes having a compressive strength in the range of 10,000 to 15,000 psi using readily available materials and conventional production techniques. Emphasis is placed on the practical and technical significance of the factors involved in the selection of the materials and their proportions to achieve uniform, economical, high quality concrete. Selection of the concrete ingredients and their proportions is discussed in terms of their relative contribution to the compressive and flexural strength, elastic properties and observed failure mode of the paste, mortar and concrete. Production of concretes having compressive strengths in excess of 15,000 psi using exotic materials and special production techniques is also discussed.

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