scholarly journals Re-Use of Date Palm Wastes to Improve Aging of Composite Concrete System

2020 ◽  
pp. 462-471
Author(s):  
Falak O. Abas
Keyword(s):  
Composite System ◽  
Date Palm ◽  
Chemical Properties ◽  
Sem Images ◽  
Mixing Ratios ◽  
Composite Systems ◽  
Time Period ◽  
New Material ◽  
Physical And Chemical ◽  
And Chemical Properties

The presented research aims to manipulate and improve the aging behaviors of concrete composite systems by employing ecologically safe date palm (seeds and husks) waste as a filler. In addition, optimized workability, durability, and erosion resistance properties for the new material were investigated.The experimental work included the application of different mixing ratios (50/50, 30/70, and 70/30) of husk date/ date seeds to study the enhanced physicochemical behaviors and erosion resistant of bio-waste-concrete composite system exposed to severe temperature conditions (50 ºC) for a time period of 25 days. Optimum results were observed for samples reinforced with the natural filler with a ratio of 50/50 in comparison to the base samples.In conclusion, good resistance to erosion and creeping thickness appeared at optimum conditions of 250 μm particle size. Also, higher reaction compatibility and less pores between particles were observed, which improved all physical and chemical properties as depicted by SEM images.

Review of Physical Properties and Preparation of Nano-Superconducting Materials

2013 ◽  
Vol 816-817 ◽  
pp. 65-69
Author(s):  
Yi Zhang
Keyword(s):  
Transition Temperature ◽  
Chemical Properties ◽  
Material Research ◽  
Physical And Chemical Properties ◽  
Superconducting Transition ◽  
New Materials ◽  
Preparation Methods ◽  
New Material ◽  
Physical And Chemical ◽  
And Chemical Properties

New materials play an important part in today high and new technology.Superconducting nanomaterial has become the most vibrant in new material research due to its unique physical and chemical properties. This paper focuses on how small-size effect affects superconducting transition temperature, and summarizes the concrete preparation methods of superconducting nanomaterials, hoping to provide a reference for material researchers.

The Utilization of Bamboo Residues and Grease Waste for Charcoal Briquette Production

2019 ◽  
Vol 886 ◽  
pp. 154-158
Author(s):  
Supaporn Pongthornpruek ◽  
Achitpon Sasitharanuwat
Keyword(s):  
Alternative Energy ◽  
Chemical Properties ◽  
Heating Value ◽  
Minimum Requirement ◽  
Mixing Ratios ◽  
Feasible Alternative ◽  
American Society ◽  
Product Standard ◽  
Physical And Chemical ◽  
And Chemical Properties

This study aims to investigate appropriate utilization of mixing grease waste (GW) from a canteen’s grease trap with bamboo residues charcoal (BC) to produce briquette fuel in the various ratio by weight, 1:2, 2:2, 3:2 and 4:2 (GW:BC). The physical and chemical properties of briquette fuel were analyzed to verify its heating value components as specified by the American Society for Testing and Material (ASTM). The results showed that the mixture of all components could produce charcoal briquette fuel. The GW:BC mixing ratios 3:2 and 4:2 have heating values exceeding the minimum requirement under the Thai Community Product Standard (tcps 238/2004). The briquettes mixing ratio of 3:2 was suitable for utilization. The heating value high to 7,938 cal/g on a dry basis.The charcoal briquette mixed with grease waste can be a feasible alternative energy source for incinerating which minimize to reduce waste.

scholarly journals Variability of Physical and Chemical Properties of TLUD Stove Derived Biochars

2020 ◽  
Vol 10 (2) ◽  
pp. 507 ◽  
Author(s):  
Federico Masís-Meléndez ◽  
Diana Segura-Chavarría ◽  
Carlos A García-González ◽  
Jaime Quesada-Kimsey ◽  
Karolina Villagra-Mendoza
Keyword(s):  
Low Cost ◽  
Chemical Properties ◽  
Exchange Capacity ◽  
Thermochemical Conversion ◽  
Sem Images ◽  
Skeletal Density ◽  
Available Water Content ◽  
Operating Temperatures ◽  
Physical And Chemical ◽  
And Chemical Properties

Biochar is a carbon-rich organic material, obtained by the thermochemical conversion of biomass in an oxygen-limited environment, used as a soil amendment to stimulate soil fertility and improve soil quality. There is a clear need in developing countries for access to low cost, low technology options for biochar production, for example, top-lit updraft (TLUD) stoves, which are popular and spread worldwide. However, TLUD biochars are inevitably very variable in their properties for a variety of reasons. We present laboratory triplicate tests carried out on TLUD biochars obtained from waste pinewood and a Guadua bamboo. Analyzed properties include specific surface area (A-BET), porosity, skeletal density, hydrophobicity, proximal and elemental composition, cation exchange capacity (CEC), relative liming capacity and pH. SEM images of the bamboo and wood biochars are compared. The biochars were mixed with composted human excreta at 5% and 10% biochar content, and available water content (AWC) was analyzed. Operating temperatures in the TLUD were recorded, showing different behaviors among the feedstocks during the process. Differences in operating temperatures during charring of the bamboo samples seem to have led to differences in A-BET, hydrophobicity and CEC, following unprecedented trends. For the mixtures of the biochars with compost, at 5% biochar no significant differences were observed for AWC. However, in the 10% biochar mixtures, bamboo biochar showed an unexpectedly high AWC. Overall, variations of chemical and physical properties between bamboo biochars were greater, while pinewood biochars showed similar properties, consistent with more homogeneous charring temperatures.

scholarly journals Strand thinning of Khadrawi date palm cultivar in relation to yield and fruit quality

2019 ◽  
Vol 43 (1) ◽  
Author(s):  
A. R. Moustafa ◽  
N. Abdel-Hamid ◽  
A. Abd El-Hamid ◽  
M. R. El-Sonbaty ◽  
S. K. M. Abd El-Naby
Keyword(s):  
Fruit Quality ◽  
Date Palm ◽  
Chemical Properties ◽  
Fruit Weight ◽  
Total Sugars ◽  
Palm Fruits ◽  
And Control ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract Background This experiment was carried out during 2015 and 2016 seasons to investigate the effect of strand thinning treatments by removing 15 and 30% of the total number of strands from the bunch center after 8 weeks from pollination (kimri stage) on productivity and fruit quality of Khadrawi date palm cultivar compared to the control (without thinning). Results The present results indicated that strand thinning by removing 30% of the total number of strands gave the lowest bunch weight and yield per palm compared to thinning 15% and control treatments during the two seasons of study. Also, removing 30% of the total number of strands improved some physical properties, i.e., fruit weight, flesh weight, fruit length, and fruit diameter than control in both seasons. All strand thinning treatments improved some chemical properties such as TSS %, total sugars %, and reducing sugars % than control (without thinning). However, both 15 and 30% strand thinning treatments had no significant effect on nonreducing sugars %, total acidity %, and tannins content in the two studied seasons. Conclusion From the obtained results, it was revealed that application of thinning treatment by removing 15 or 30% of the total number of strands from bunch center improved some physical and chemical properties of Khadrawi date palm fruits although there are no significant differences found between strand thinning at 15% and control during the second season.

Analysis of the Degradation of External Plasters in the Buildings with ETICS

2014 ◽  
Vol 1041 ◽  
pp. 15-18
Author(s):  
Veronika Kučeriková ◽  
Michal Kraus ◽  
Darja Kubečková
Keyword(s):  
Carbon Dioxide ◽  
Composite System ◽  
Raw Materials ◽  
Chemical Properties ◽  
Ambient Air ◽  
Temperature Extremes ◽  
Biological Degradation ◽  
Physical And Chemical ◽  
And Chemical Properties

The external plaster are currently the most common finish coat of buildings. The characteristic technological and chemical properties of plasters protect supporting structure against weather and temperature extremes. Quality of plaster is determined by its durability, which depends primarily on the quality of raw materials, the quality and porosity of the substrate, the temperature during application, concentration of carbon dioxide and humidity of the ambient air. The physical and chemical and biological degradation of plaster is caused due to weathering and exposure to aggressive substances of environment. The paper deals with the analysis of the causes of degradation (green facades) and the possibilities of remediation of biotic attack of plasters buildings with External Thermal Insulation Composite System (ETICS).

scholarly journals Chemistry for nanotechnology

2014 ◽  
Vol 16 (1) ◽  
pp. 70-74 ◽  
Author(s):  
Grzegorz Schroeder ◽  
Joanna Kurczewska
Keyword(s):  
Chemical Synthesis ◽  
Chemical Compound ◽  
Chemical Properties ◽  
Functional Materials ◽  
Chemical Compounds ◽  
Physical And Chemical Properties ◽  
Processing Order ◽  
New Material ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract In recent years, the processing order during the synthesis of new chemical compounds has been redefined. Until now a chemist considered primarily receiving a new compound and only then searched for its potential application. The new philosophy of proceedings forces chemists to answer the question: what physical and chemical properties a new chemical compound must have, and what should be structured. After that it has to be planned how to get the compound including the defined budget. The compounds obtained by conventional chemical synthesis are then used to create new functional materials having the properties as scheduled. The paper presents the way of the proceedings from a molecular receptor to a new nanomaterial containing this receptor, so in other words from individual molecules to new material with specific and previously planned properties.

scholarly journals Stabilization and Carbonization of PAN Nanofiber Mats Electrospun on Metal Substrates

2021 ◽  
Vol 7 (1) ◽  
pp. 12
Author(s):  
Jan Lukas Storck ◽  
Bennet Brockhagen ◽  
Timo Grothe ◽  
Lilia Sabantina ◽  
Bernhard Kaltschmidt ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Chemical Properties ◽  
Substrate Material ◽  
Metal Foil ◽  
Sem Images ◽  
Additional Equipment ◽  
Nanofiber Mats ◽  
Physical And Chemical ◽  
Pan Nanofiber ◽  
And Chemical Properties

Polyacrylonitrile (PAN) nanofiber mats are typical precursors for carbon nanofibers. They can be fixed or even elongated during stabilization and subsequent carbonization to gain straight, mechanically robust carbon nanofibers. These processes necessitate additional equipment or are—if the nanofiber mats are just fixed at the edges—prone to resulting in the specimens breaking, due to an uneven force distribution. Hence, we showed in a previous study that electrospinning PAN on aluminum foils and stabilizing them fixed on these substrates, is a suitable solution to keep the desired morphology after stabilization and incipient carbonization. Here, we report on the influence of different metallic and semiconductor substrates on the physical and chemical properties of the nanofiber mats after stabilization and carbonization at temperatures up to 1200 °C. For stabilization on a metal substrate, an optimum stabilization temperature of slightly above 240 °C was found, approached with a heating rate of 0.25 K/min. Independent from the substrate material, SEM images revealed less defect fibers in the nanofiber mats stabilized and incipiently carbonized on a metal foil. Finally, high-temperature carbonization on different substrates is shown to allow for producing metal/carbon nano-composites.

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

Sign in / Sign up

Export Citation Format

Share Document