Search Options

Sort by:

Sort search results by

Publication Type:

Publication Type filter

Open access:

Publication Date:

Periodicals:

Periodicals filter

Search results

Online since: September 2008
Authors: Pasquale Stano
Within this question, there are two complementary aspects: the first is whether, and to what extent, life can be explained in terms of the laws of chemistry and physics, and the second is, whether and to what extent, life - in its simplest expression - can be constructed in the laboratory.
Even the simplest unicellular organism is extreme complex: it contains at least 500-700 genes, and actually a living cell can be seen as a hierarchic structure of high complexity consisting of many sub-systems linked to each other: the nucleus (in eukaryotic cells), the ribosomal system, RNA- and DNA-polymerases, several interlocked metabolic cycles, and so on.
In turn, this should mean that in a very permissive environment, the essential structure/function of a cell can be probably much simpler, and nevertheless being characterized by a "blue print" of cellular life, i.e. those basic processes that are responsible for the essence of life of a cell.
A lower degree of complexity may signify a lower number of sub-systems in the hierarchic structure of the cell, as well as a lower number of components in each of the sub-systems.
Online since: November 2017
Authors: Volodymyr Falshtynskyi, Edgar Caseres Cabana, Roman Dychkovskyi, Gennadiy Pivnyak
Depending upon qualitative composition and availability of the required combustible or other agents within waste structure, its utilization may be directed to a complete, thermally destructive disposal; however, its transformation into useful gas components for further application (including that in a closed cycle of gas generator) is more promising alternative. 2.
Chemical transformations of organic structures take place at 150-200 °С temperatures.
Energy of compound breakages depends upon the nature of components which united them into one system as well as upon the features of the structure of radicals forming them.
Conclusions The authors’ practices concerning chemistry of reaction medium heating up and the results of initial temperature action within reaction channel of underground gas generator prove demonstratively the possibility to achieve flash point of industrial and municipal waste.
Online since: June 2022
Authors: Nebahat Aral, Idil Yigit
On the other hand, since there are many compounds in the structure of propolis, more detailed analyzes are needed to evaluate the effect of the content.
Since chemical analysis was not performed on nonwovens, it was not determined that which phenolic compounds are removed from the surface of samples or remain in the nonwoven structure.
It can be assumed that filtration properties of the surgical masks can be preserved by using spunbond nonwoven with propolis, only in the outermost layer, and meltblown structures in the inner layers.
Macedonian Journal of Chemistry and Chemical Engineering, 35(1), (2016), 1-11
Online since: August 2017
Authors: Ajith Kumar Soman, Arul Maximus Rabel, P. Kuppusami
Any anode must have prepared with (i) sufficient porous structure for the fuel supply and the reaction product removal, (ii) stable under reducing atmosphere at operating temperature, (iii) thermal expansion coefficient (TEC) should match with adjoining electrolyte, and (iv) high electrochemical catalytic activity for the oxidation of the selected fuel gases [24, 25].
Fig. 2 (a) Lattice parameters of NiO and (b) Lattice parameter of GDC10 using Nelson-Riley Function of NiO-GDC (50:50) sample The lattice parameter value for GDC calculated from the present study is close to pure CeO2 with cubic fluorite structure (5.411 Å).
Bharadwaj, Materials Chemistry and Physics, 99, 2-3 (2006) 289-294
Jadhav, Fabrication and characterizations of NiO-GDC/GDC structure for IT-SOFC, AIP Conf.
Online since: December 2024
Authors: Nimish H. Vasoya, P. Satishkumar, R. Rathinam, Nischal P. Mungle, T.G Sakthivel, S. Selvarasu
Vasoya2,b, T.G.Sakthivel3,c, R.Rathinam4,d, S.Selvarasu5,e, Satishkumar P6,f* 1Assistant Professor, Department of Mechanical Engineering, Yeswantrao Chavan College of Engineering, Nagpur, Wanadongri, Maharashtra, India. 2Associate Professor, Department of Balbhavan, Children's University, Gandhinagar, Gujarat, India. 3Department of Mechanical Engineering, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Chennai 602105. 4Professor, Department of Chemistry, Sri Eshwar College of Engineering, Kinathukadavu, Coimbatore - 641202, India. 5Department of Mechanical Engineering, Arunai Engineering College, Velu Nagar, Tiruvannamalai, Tamilnadu, India 606603. 6Assistant Professor, Department of Mechanical Engineering, Rathinam Technical Campus, Coimbatore, Tamilnadu, India.
Sepiolite, a needle-shaped hydrated magnesium silicate with the distinct chemical composition of Si12O30Mg8(OH)4(H2O)4·8H2O, differs from other phyllosilicates with lamellar structures and has garnered attention for its potential in enhancing polymer flame resistance [4], [5].
Magnesium ions in octahedral coordination hold together two layers of silica tetrahedrons to form the structure.
Over a wide temperature range, the dynamic mechanical test has a profound effect on the chemical and physical structure of polymer materials.
Online since: December 2024
Authors: Tran Thi Ngat, Duy Nam Phan, Nguyen Minh Tuan, Nguyen Van Toan
The plain weave cotton fabric's structures and morphologies were analyzed using scanning electron microscopy (SEM, Hitachi TM4000 Plus), X-ray diffraction (XRD, D8 Advance, Brucker, Germany), and Energy-dispersive X-ray spectroscopy (EDS, EDS, SU-8000 microscope, Hitachi, Japan).
Fig.2 illustrates the XRD pattern used to analyze the phase formation and crystal structure of TiO2 nanoparticles synthesized via the sol-gel method.
Zecchina, Cotton textile fibres coated by Au/TiO2 films: Synthesis, characterization and self cleaning properties, Journal of Photochemistry and Photobiology A: Chemistry 199(1) (2008) 64-72
Venkataraman (Eds.), Advanced Multifunctional Materials from Fibrous Structures, Springer Nature Singapore, Singapore, 2023, pp. 105-129
Online since: April 2014
Authors: Annika Raatz, Christoph Herrmann, Stefan Andrew, Jan Schmitt
Figure 1: Structure of a battery system Especially the complex structure and the high weight of lithium ion batteries require special equipment to handle and dismantle the battery systems.
Some of the identified approaches focus on the planning of the whole disassembly system, i.e. the logistics, layout and organisational structure, such as [8], [9], [10], [11], [12] and [13].
Due to uncertainties about the development of the battery technology (e.g. cell chemistry, design) as well as the development of the electric vehicle market (number of end-of-life battery systems) the planning of one specific disassembly system that is suitable for the next 30 years is impossible.
Online since: May 2016
Authors: Saman Firoozi, Amir Amani, Mohammad Ali Derakhshan, Hossein Ghanbari
Applying artificial neural networks (ANNs) as a modeling technique, which mimics structure of a neural brain, in order to analyze data especially for highly interconnected and fused data could be a proper option.
Network structure No. of hidden layers 1 No. of nodes in hidden layer 5 Back prop. type Angle Driven Learning Back propagation parameters Momentum factor 0.8 Learning rate 0.7 Targets Maximum iterations 1000 MS error 0.0001 Random seed 10000 Smart stop Minimum iterations 20 Test error weighting 0.1 Iteration overshoot 200 Auto weight On Smart stop enabled On Transfer function Output Asymmetric Sigmoid Hidden layer Asymmetric Sigmoid The test data (i.e. 10% of data set, as recommended by the software) were employed to cease training process at incidence of overtraining.
Lee, Preparation of electrospun porous ethyl cellulose fiber by THF/DMAc binary solvent system, JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY-SEOUL-, 13 (2007) 1002
Lyoo, Role of molecular weight of atactic poly (vinyl alcohol)(PVA) in the structure and properties of PVA nanofabric prepared by electrospinning, J.
Online since: September 2019
Authors: Saulekul Aizhambaeva, Gulnara Zhetessova, Tatyana Nikonova, Michael Belik, Galina Vavilova
As a result, there was formation of a copper cover on the surface of particles of the steel with formation of the pseudo-alloy structure of spraying particles.
Getting on the sprayed surface, particles are heaped at each other and form a metallic covering of the layered structure.
The data of the impact of operating modes of a spraying machine on the process of dispersion allows establishing the ways of controlling the particle size, distribution of products of dispersion with arc spraying pseudo-alloy coverings and respectively the structure and properties of the obtained coverings.
Physics, Chemistry 4(1) (2011) 3-7
Online since: November 2016
Authors: Jörg Franke, Sven Kreitlein, Fabian Baumhoer, Fabian Ultsch
For the identification of highly efficient production structures a comparison to derive specific saving potentials is possible.
Only by means of this is it possible to identify highly efficient production structures and specific saving potentials that can be a positive example and reference.
From the energetic perspective, there is no difference of process sequences between microscopic and macroscopic level in the chemistry.
The reasons for these deviations are defects in the real lattice structure, which lead to a reduction of the critical shear stress [22].