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Online since: May 2021
Authors: T.V. Diaghileva, R.A. Sokolov, V.F. Novikov, M.V. Deneko
Anosov established the relationship between the structure of steel and its properties.
Thus, chemistry and physics play an important role in understanding the properties of metal.
Currently, non-destructive testing methods are more and more common in the steel structures’ inspection for buildings and structures.
The first study of metal structure in the native materials science was conducted by P.
He carried out research on the atomic, crystal and electronic structure of metals.
Online since: August 2013
Authors: Zhao Sheng Li, Yi Qiu Tan
The factors such as shrinkage coefficient of asphalt pavement, temperature stress, pavement structure combination forms and temperature contribution affect the asphalt pavement on cracking behavior.
Introduction Low-temperature cracking is one of the main forms of asphalt pavement damage, the existence of the crack make the water go through and enter the inside structure of the pavement, the water infiltrates base course and subgrade along the pore of the asphalt mixture, it will reduce the carrying capacity of the pavement structure, seriously affects the ride quality of vehicle and reduces the service life of the pavement[1,2].
Through the numerical method of theoretical structure analysis, the inside temperature field of asphalt pavement can be calculated and then the crack temperature can be predicted[5,6].
Factors influencing low-temperature cracking of asphalt are very complex including the shrinkage coefficient of asphalt mixture, temperature stress, the combination forms of pavement structure and temperature contribution[7,8].
[5] J.T.Christison,The Response of Asphalt Concrete Pavements to Low Temperature climatic Enviroments,Proceedings of 3rd Int.Conf.on the Structural Design of Asphalt Pavements,Vol.1,1972 [6] C.Vander Poel,A.General System Denscribing the Vicoelastic Properties of Bitumen and Its Relation to routine Test Data Journal of Applied Chemistry, Vol.4,1954,P221~236 [7] B.
Online since: November 2012
Authors: Toomas Tamm, Raido Metsvahi, Lembit Kommel
Effect of New Superhard Phases Formation on Properties of Composite Processed by SHS Lembit Kommel1, a, Toomas Tamm2, b, Raido Metsvahi1, c 1Department of Materials Engineering, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia 2Department of Chemistry, Tallinn University of Technology, Akadeemia tee 15, 19086 Tallinn, Estonia alembit.kommel@ttu.ee, btamm@yki.ttu.ee, craido.metsvahi@ttu.ee Keywords: SHS, CMC, c-BC2N, wear, friction, hardness Abstract.
In other cases chemistry-based methods are used to enhance the mechanical properties of composites.
It is proposed that initially a change in the structure of B4C takes place, followed by insertion of nitrogen.
Oikawa, Simultaneous crystallization of diamond and cubic boron nitride from the graphite relative BC2N under high pressure/high temperature conditions: Chemistry of Materials 5 (1993) 695-699
Online since: April 2019
Authors: Janis Rizhikovs, Aigars Paze
Study of an Appropriate Suberinic Acids Binder for Manufacturing of Plywood Aigars Paze1,a* and Janis Rizhikovs1,b 1Latvian State Institute of Wood Chemistry, Dzerbenes 27, Riga, LV-1006, Latvia, aaigars.paze@gmail.com, bj.rizikovs@edi.lv Keywords: birch outer bark, suberin depolymerization, precipitation pH level, suberinic acids.
A linear polymer structure is formed when SA are heated up to 130 °C but the further temperature increase up to 160 °C contributes to the formation of a three-dimensional elastomer, which has low solubility in organic solvents.
To remove the extractives, birch outer bark with a particle size of 1.0-4.0 mm was extracted with ethanol using the technology and laboratory-scale pilot equipment developed at the Biorefinery Laboratory of the Latvian State Institute of Wood Chemistry.
Garyntseva, A study of the isolation process of the suberinic substances from birch outer bark, Himija rastitel'nogo syr'ja (Chemistry of Plant Raw Material) 1 (2008) 41-44 (in Russian)
Online since: June 2020
Authors: Hamdan Sinin, Md. Tipu Sultan, Md. Faruk Hossen, Md. Rezaur Rahman
Schneider, “Furfurylation of wood: chemistry, properties and commercialization,” in:Development of Commercial Wood Preservatives, ACS Symposium Series 982 (2008) 337-355
In Hand book of Wood Chemistry and Wood composites (Rowell, R.
Popescu, Structural modifications of Tiliacordata wood during heat treatment investigated by FT-IR and 2D IR correlation spectroscopy, Journal of Molecular Structure 1033 (2013)176–186
Perejon, Nanoclay Nucleation Effect in the Thermal Stabilization of a Polymer Nanocomposite: A Kinetic Mechanism Change, The journal of physical chemistry 116 (2012) 11797–11807.
Online since: November 2020
Authors: Abidin Trimurni, Syafrudin Ilyas, Marline Nainggolan, Endang Syamsudin, Olivia Avriyanti Hanafiah
extremely well for a long time and has been consumed more than thousands of years ago in China and Taiwan [5][6] besides that binahong has long been used in traditional medicine on wound healing by the people in Indonesia.[7] Several researchers have studied that Binahong leaves extract was able to heal wound in experimental animals.[3][8][9] The previous study showed that administration of Binahong leaves extract gel for 7 days can increase the number of fibroblast cells on marmot tooth socket healing.[10] The gel dosage form is easier to use and provides comfort in the mouth of the patient than other dosage forms.[11] Binahong contains active compounds of flavonoid, saponin, tannin and polyphenol which can stimulate proliferation of fibroblast and collagen formation which has a role in the process of wound healing.[3][4][9] Fibroblasts are cells that is necessary role play in wound healing, such as the destruction of fibrin clots, forming new extracellular matrices and forming collagen structures
Proceedings of the 9th Joint Conference on Chemistry – Green Chemistry Section 4: Organic Chemistry, 317-321
Online since: June 2003
Authors: Gulzhian I. Dzhardimalieva, Anatolii D. Pomogailo, A.S. Rosenberg
Applications in chemistry include new reactions, catalytic and sensor systems, and preparation of compounds and nanocomposites with novel properties.
Physics applications include material synthesis for electronics, nanometric structures for recording and the transformation of radiation of different energies; whilst in biology and medicine, new drugs and their transportation mechanisms are also problems of nanochemistry and nanotechnology [1].
Many of these principles are employed in the rapidly developing field of nanotechnology [5] and are likely to form the basis of a new branch of science which may be defined as chemistry of highly organised compounds, including supramolecular chemistry.
Online since: January 2021
Authors: Muhammad Ali Zulfikar, Herlina Herlina, Buchari Buchari
Electron Transfer in Electro-Oxidation of Amoxicillin Using Platinum Electrode and Platinum Modified Cobalt Electrodes Herlina1,2,a*, Muhammad Ali Zulfikar1,b*, Buchari1,c 1Institut Teknologi Bandung, Analytical Chemistry Research Group, Indonesia 2Institut Teknologi Medan, Electrical Engineering Department, Indonesia e-mail: herlina@itm.ac.id ; zulfikar@chem.itb.ac.id ; buchari@.chem.itb.ac.id Keywords: amoxicillin; electro-oxidation; linear sweep voltammetry, Nernstian factor.
Figure 4 shows the UV/Vis spectra of amoxicillin: Fig. 4 UV/Vis spectra of 50 ΜM amoxicillin in the pH range of 2 – 11 Fig. 5 Amoxicillin and its pKa values According to amoxicillin pKa’s values (the amoxicillin structure as proposed in Figure 5), when the solution has pH higher than 2 the protonation occurs and amoxicillin is in COO- and NH3+ form.
[6] Institute of Chemistry, Jan Kochanowski University, Swietokrzyska St. 15G, PL-25406 Kielce, Poland, M.
Cairns, Essentials of pharmaceutical chemistry, 3. ed, Pharmaceutical Press, London, 2008
Online since: November 2023
Authors: Erick Cordova-Tapia, Lucía Morales Rivas, Carlos Garcia-Mateo, Radhakanta Rana
Introduction Due to the quest for lightweight structures in automobiles in general (both in passenger cars and heavy commercial vehicles), the automotive industry is striving to use stronger materials.
Therefore, a second set of calculations were performed to optimize criterion 4, varying Mo and Si in the already narrowed down chemistries.
The exact steel chemistry (wt.%) after casting was: Fe-0.3C-2.46Si-1.51Mn-1.43Cr-0.24Mo, all in wt.%.
All these shape, size and chemistry related characteristics of RA are conducive in achieving a high stability of RA in the steels.
Online since: August 2012
Authors: Jing Xu, Yu Hong Feng, Qiang Lin, Zhen Yi Liang, Zhao Wang, Yan Feng Liu, Yu Kai Chen
Comparative evaluation of the chemical composition of essential oil from different parts of Ficus microcarpa Qiang Lin1, a, Yanfeng Liu2, b, Yukai Chen3, c, Zhao Wang4, d, Zhenyi Liang5, e, Yuhong Feng6, f, Jing Xu7, g,* 1 Key Laboratory of Tropical Medicinal Plant Chemistry, Ministry of Education, Hainan Normal University, Haikou 571158, China 2 Key Laboratory of Protection and Development Utilization of Tropical Crop Germplasm Resources, Ministry of Education, College of Material and Chemical Engineering, Hainan University, Haikou 570228, China 3 Key Laboratory of Protection and Development Utilization of Tropical Crop Germplasm Resources, Ministry of Education, College of Material and Chemical Engineering, Hainan University, Haikou 570228, China 4Key Laboratory of Protection and Development Utilization of Tropical Crop Germplasm Resources, Ministry of Education, College of Material and Chemical Engineering, Hainan University, Haikou 570228, China 5 Key Laboratory of Protection
These results encourage complementary and more in-depth studies on the chemical composition of the plant extracts with the aim of separation and structure elucidation of their active components and evaluation of biological activity of each compound separately.
Research Starting Found (kyqd1066), 2011 Hainan Provincial Natural Science Foundation (No. 211012), 2012 Key lab of tropical pharmaceutical herb chemistry of Hainan province Open Fund in Hainan Normal University (No. 201105) are gratefully acknowledged.
Eitenmiller: Chemistry, nutrition and biotechnology, (1998), 423–448