scholarly journals SMALL ARCHITECTURAL FORMS: COMPOSITION AND PROPERTIES OF CONCRETE FOR THEIR PRODUCTION

2021 ◽  
Vol 6 (11) ◽  
pp. 8-31
Author(s):  
V. Strokova ◽  
N. Hmara ◽  
V. Nelyubova ◽  
N. Shapovalov
Keyword(s):  
Urban Space ◽  
Physical And Mechanical Properties ◽  
Parameter Analysis ◽  
Bibliometric Indicators ◽  
High Quality ◽  
Scientific Publications ◽  
Cement Ratio ◽  
Fine Grained ◽  
Weather Resistance ◽  
Modern Landscape

The work is the result of a multi parameter analysis of scientific publications affecting the study of the properties and characteristics of composite binders and concretes based on them, used in the design and production of small architectural forms. General assessment of the prospects for the use of composite binders in this type of buildings and structures is given. All publications and experimental materials on this topic are summarized according to the following parameters: bibliometric indicators of articles for the period from 2000 to 2020, types of concrete used for small architectural forms, types of binders, aggregates, fillers and additives used, physical and mechanical properties and controlled parameters of concrete. It is shown that in most of the studies under consideration, fine-grained concrete based on white, general construction and non-ferrous cement was used. At the same time, to increase the efficiency of finished products in terms of the formation of a developed shape and ensure their weather resistance, high-quality cements are used, the water-cement ratio decreases, including due to the use of additives for various purposes. It is substantiated that designing of concrete for small architectural forms should be carried out based on the specified requirements for this type of structures. The production of high-workability mixtures should be considered to ensure the specified castability in order to form products of various configurations and standard sizes while maintaining architectural expressiveness and compliance with the modern landscape of urban space.

Evaluating quality of science in CGIAR research programs: Use of bibliometrics

2021 ◽  
pp. 003072702110242
Author(s):  
Max Rünzel ◽  
Paolo Sarfatti ◽  
Svetlana Negroustoueva
Keyword(s):  
Review Process ◽  
Research Output ◽  
Monitoring And Evaluation ◽  
Bibliometric Indicators ◽  
Scientific Publications ◽  
Practical Utilization ◽  
Research Programs ◽  
First Time ◽  
Quality Of Research

When evaluating Quality of Science (QoS) in the context of development initiatives, it is essential to define adequate criteria. The objective of this perspective paper is to show how altmetric and bibliometric indicators have been used to support the evaluation of QoS in the 2020 Review of the Phase 2-CGIAR Research Programs (CRPs, 2017–2022), where, for the first time, the Quality of Research for Development (QoR4D) frame of reference has been utilized across the entire CGIAR CRP portfolio. Overall, the CRP review showed a significant output of scientific publications during the period 2017–2020, with 4,872 articles, 220,101 references, and 7.1 citations per article. Additionally, wider interest in scientific publications is demonstrated by good to high altmetrics, with average attention scores ranging from 70.8 to 806.9 with an average of 425.1. The use of selected bibliometrics was shown to be an adequate tool, for use together with other qualitative indicators to evaluate the QoS in the 12 CRPs. The CRP review process clearly demonstrated that standardized, harmonized and consistent data on research output is paramount to provide high-quality quantitative instruments and should be a priority throughout the transition toward One CGIAR. Therefore, we conclude that the QoR4D framework should be augmented by standardized bibliometric indicators embedded in measurement frameworks within the new One CGIAR. Finally, its practical utilization in monitoring and evaluation should be supported with clear guidelines.

Physical and Mechanical Properties of Fine-Grained Soil in the Zhejiang-Fujian Coastal Area, China

2011 ◽  
Vol 29 (4) ◽  
pp. 333-345 ◽  
Author(s):  
Yuan-Qin Xu ◽  
Pei-Ying Li ◽  
Ping Li ◽  
Le-Jun Liu ◽  
Cheng-Xiao Cao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Coastal Area ◽  
Physical And Mechanical Properties ◽  
Fine Grained ◽  
Fine Grained Soil

Research on Simulation Test of Coal Similar Material

2013 ◽  
Vol 850-851 ◽  
pp. 847-850 ◽  
Author(s):  
Lin Chao Dai
Keyword(s):  
Compressive Strength ◽  
Raw Materials ◽  
Similarity Theory ◽  
Design Method ◽  
Uniform Design ◽  
Physical And Mechanical Properties ◽  
Raw Material ◽  
Similar Material ◽  
Cement Ratio ◽  
Water Cement Ratio

In order to study the coal and gas outburst similar simulation experiment, coal similar material was made up based on the similarity theory. Based on the previous similar material study, the cement, sand, water, activated carbon and coal powder was selected as the raw material of similar material. Meanwhile similar material matching program with 5 factors and 6 levels was designed by using Uniform Design Method. And the physical and mechanical properties of the similar material compressive strength was measured under different proportions circumstances. The relationship between similar material and the raw materials was analyzed. The results show that choosing different materials can compound different similar materials with different requirements. And the water-cement ratio plays a decisive influence on the compressive strength of similar material. The compressive strength of similar material decreases linearly when the water-cement ratio increases.

scholarly journals From journal to headline: the accuracy of climate science news in Danish high quality newspapers

2011 ◽  
Vol 10 (02) ◽  
pp. A03 ◽  
Author(s):  
Gunver Lystbæk Vestergård
Keyword(s):  
Climate Change ◽  
Content Analysis ◽  
Mass Media ◽  
Scientific Research ◽  
Climate Science ◽  
High Quality ◽  
Scientific Publications ◽  
News Stories ◽  
Science News ◽  
Preliminary Study

A significant number of mass media news stories on climate change quote scientific publications. However, the journalistic process of popularizing scientific research regarding climate change has been profoundly criticized for being manipulative and inaccurate. This preliminary study used content analysis to examine the accuracy of Danish high quality newspapers in quoting scientific publications from 1997 to 2009. Out of 88 articles, 46 contained inaccuracies though the majority was found to be insignificant and random. The study concludes that Danish broadsheet newspapers are ‘moderately inaccurate’ in quoting science publications but are not deliberately hyping scientific claims. However, the study also shows that 11% contained confusion of source, meaning that statements originating from press material or other news outlets were incorrectly credited to scientific peer-reviewed publications.

scholarly journals High-Quality Image Captioning With Fine-Grained and Semantic-Guided Visual Attention

2019 ◽  
Vol 21 (7) ◽  
pp. 1681-1693 ◽  
Author(s):  
Zongjian Zhang ◽  
Qiang Wu ◽  
Yang Wang ◽  
Fang Chen
Keyword(s):  
Visual Attention ◽  
Image Captioning ◽  
High Quality ◽  
Fine Grained ◽  
High Quality Image ◽  
Quality Image

scholarly journals Mechanical and physical properties of fine-grained concrete for concrete additive manufacturing

2019 ◽  
Vol 91 ◽  
pp. 02041
Author(s):  
Sergey Udodov ◽  
Yuriy Galkin ◽  
Philip Belov
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
3D Printing ◽  
Physical Properties ◽  
Crucial Role ◽  
Physical And Mechanical Properties ◽  
Concrete Composition ◽  
Fine Grained ◽  
Mechanical And Physical Properties ◽  
Time Periods

Additive manufacturing (3D printing) is becoming more and more common in the field of modern construction. However, for wider implementation of this technology, it is necessary to solve a number of material-oriented scientific problems related to development of concrete composition with targeted rheological, stress-strain, physical and mechanical properties. It has been established that time periods between successful applications of layers play the crucial role in ensuring monolithic features of the “printed” structures. Application of mathematics planning of the experiment allowed establishing the main principles of formation of basic physical and mechanical properties of fine-grained concrete depending on material composition.

Influence of Physical Properties of B4C Powder on the Strength Properties of the Ceramics Manufactured by SPS Sintering

2015 ◽  
Vol 1085 ◽  
pp. 312-315
Author(s):  
Oleg L. Khasanov ◽  
Edgar S. Dvilis ◽  
Zulfa G. Bikbaeva ◽  
Valentina V. Polisadova ◽  
Alexey O. Khasanov ◽  
...  
Keyword(s):  
Physical Properties ◽  
Boron Carbide ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Strength Properties ◽  
Carbide Powder ◽  
Fine Grained ◽  
Fine Grained Structure ◽  
Determining Factor ◽  
Sps Sintering

Ceramics samples in the form of a parallelepiped with high strength characteristics have been made. For the manufacture of the ceramics samples a powder mixture from submicron В4С powder with additives (1 wt%, 5 wt%, 10 wt%) of boron carbide nanopowder was used. The physical properties of the powder mixtures and strength properties of sintered ceramics have been studied. It was shown that the use of submicron fractions of the boron carbide powder together with nanoadditives is a determining factor in the formation of dense fine-grained structure providing improved physical and mechanical properties of the ceramics.

Basalt Fiber Reinforce Cement-Based Composite Materials

2011 ◽  
Vol 374-377 ◽  
pp. 1837-1842
Author(s):  
Ming Tang ◽  
Jing Qi Li ◽  
Hong Liang Liu ◽  
Ning Chen
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Flexural Strength ◽  
Basalt Fiber ◽  
Physical And Mechanical Properties ◽  
Alkali Resistance ◽  
Orthogonal Experimental Design ◽  
Enhancement Effect ◽  
Cement Ratio ◽  
Water Cement Ratio

In order to obtain the high performance cement-based consistent materials，the enhancement effect of basalt fiber was studied to develop the building mortar with a high flexural strength . Three factors such as basalt fibers fraction，water-cement ratio and sand-lime ratio are studied on compressive and flexural strength on 7 days and 28 days through the orthogonal experimental design and statistical analysis. According to project needs, the best combination of flexural strength is optimized. The enhancement mechanism and damage features are analyzed and evaluated by SEM, the result shows that the basalt fiber as enhanced component have a very good flexural strength enhancement effect, the maximum increased rate will reach 2.91 times. The effect on the strength of different age period is remarkable with different fiber fraction which is far greater than the water-cement ratio and sand-lime ratio. Basalt fiber have better physical and mechanical properties and better alkali resistance, some performance are second only to carbon fiber, and the cost of basalt fiber is far lower than carbon fiber, So the basalt fiber have a broad application prospects in the field of cement-based composite materials.

The Comparison between Boron Carbide (B4C) with other Common Inhibitors on Physical and Mechanical Properties of WC/Co

2012 ◽  
Vol 05 ◽  
pp. 102-110 ◽  
Author(s):  
H. Tamizifar ◽  
A.M. Hadian ◽  
M. Tamizifar
Keyword(s):  
Boron Carbide ◽  
Vanadium Carbide ◽  
Sintering Temperature ◽  
Physical And Mechanical Properties ◽  
Growth Inhibitor ◽  
Hard Metal ◽  
Growth Inhibitors ◽  
Fine Grained ◽  
Hard Metals ◽  
Boron Carbide B4c

The hardness, toughness and sum of cracks measurement of fine-grained WC - Co hard metals were studied. Thirty commercial and experimental hard metal grades with different additives such as boron carbide ( B 4 C ), vanadium carbide ( VC ), chromium carbide ( Cr 3 C 2) and silicon carbide ( SiC ) were prepared in a commercial sinter HIP furnace. Physical, mechanical and microstructure properties were investigated to build up a representative hardness/sum of cracks measurement band. This band was then used to estimate the most effective sintering temperature and the amount of each additives. Afterwards, influence of grain growth inhibitors in optimum condition were compared. The results showed that the grades, doped with B 4 C and VC as growth inhibitor exhibits more hardness than other comparable doped alloys. However, Cr 3 C 2 is favorable in toughness improvement.

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