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The as-received screws were probably in rolled and quenched and tempered condition according to structure and mechanical properties (Table 2).
It is considered the information about presence of impurities, microcavities, microcracks, primary and secondary structure and mechanical properties.
The samples for structure analysis were taken from different parts of new, used-unbroken and used-broken screws by cutting in radial direction.
Primary structure was revealed by use of Oberhoffer’s reagent, while secondary structure with 2% Nital.
The presence of microcavities and microcracks was analyzed on polished surfaces by use of Scanning Electron Microscopy with Energy Dispersive System (SEM-EDS), as well as fractography and fractured surfaces chemistry.

In order to simulate, with a high accuracy, a process that includes in its structure a distributed parameter sub-process, an original method based on the matrix of partial derivatives of the state vector, associated with Taylor series, is used.
The modeling-simulation procedure introduces the premise to approximate the concentration value of the gas absorbed in liquid, in relation to the initial pressure from the reactor, respectively the premise of including the technological process in a concentration control structure.
In (16), the φ00 function includes in its structure de signals yI0 , yI1 , respectively yI2 .
The first two elements from the structure of the xT vector, more exactly yIB2 and y20 are the pivot elements having a big importance in the numerical simulation procedure.
The mathematical model proposed in this paper, with minor adjustments, can be used in order to be included in an automatic control structure of the concentration of the gas absorbed in the liquid [7,8].

The temperature increase within the concrete originating from the hydratation exothermic reaction of cement is emphasized by the mass effect of the structures and can lead to thermal variations of around 50°C between the heart and the structures walls.
Introduction The concrete is the most used material in the world for the construction of buildings and structures.
Fires in tunnels under the English Channels (1996 and 2008) in France, Tauern (1999) in Austria and St Gotthard (2001) in Switzerland are real examples of the damages of structures subjected to high temperatures.
Research in the field provide a deeper knowledge of the behavior of very high performance concrete (VHPC) at high temperatures in order to improve the safety of buildings and structures. 2.
Figi "The influence of superplasticizers on the refuel of Portland cement", 12th International Congress on the Chemistry of Cement, Montreal, Canada, July 8-13, (2007)

Noted that the introduction of time delay of 2 min significantly altered the structure whereby in n-type (111), the circular pore spreaded into spongy structures.
The uniform pore structures from pulse technique possibly responsible for the higher peak intensity.
The crystal orientation of n-type (100) showed larger and less dense pore structure compare to n-type (111).
Finally the sensitivity of the MSM photodetector can be enhanced by the PS structure under the Ni contact.
Habubi, Fabrication and characterizatiom of porous silicon layer prepared by photo-electrochemical etching in CH3OH:HF solution, International Letters of Chemistry, Physics and Astronomy, 3 (2013) 29-36

The illustrative results using Vesta software of the Sr-CoFe2O4 structure in this research are presented in Figure 2.
Thus, the available Sr2+ cation content determines the energy required for the final crystalline structure [10].
The main absorption band range corresponds to the cobalt ferrite based structure.
Matsuyama, Annealing temperature dependence of crystalline structure and magnetic properties in nano-powder strontium-substituted cobalt ferrite, Nano-Structures and Nano-Objects. 30 (2022). https://doi.org/10.1016/j.nanoso.2022.100862
Lide, CRC Handbook of Chemistry and Physics, Internet Version 2005, CRC Press.

The induced CD spectra by Congo red and the CD spectra of KGM in aqueous and urea solution indicated further that KGM had a single-helical structure.
The ordered structure of the glucan can form a complex with Congo red.
Moreover, KGM had the ordered, single-helical structure in distilled water when T<55 , and had disordered, random coils in NaOH (>0.5 M) solutions or at T>60 .
Opticity is the most direct and valid character on reflecting helical structure of polymer[47].
Foster, in: Starch: Chemistry and Technology , edtied by R.L.

XRD, BET surface area and micropore volume are applied in order to study the structure and properties of Al-pillared montmorillonite.
[19] H.Van Olphen, An Introduction to Clay Colloid Chemistry, Wiley, New York, 2nd ed., 1977.

It also causes serious distress to the existing structures such as pavements, foundations, underground pipelines and culverts.
Marín, Free-product plume distribution and recovery modeling prediction in a diesel-contaminated volcanic aquifer, Physics and Chemistry of the Earth, ELSEVIER, 37 (2012) 43-51

The hydrological conditions of wetlands are key factors, which decided ecological process, structure and function of wetlands.
Impacts of Climate Change on ecological system structure and function of Wetlands.
The biodiversity state decides structure and function of wetland ecosystem.
The research is also involved in impacts of climate change on structure and function of wetland ecosystem [2].
Journal of atmospheric chemistry, Vol. 8(4) (1989), P.307-358 [39] Matthews E Fung I.

School of Chemistry and Environment Protection Engineering, Southwest University for Nationalities, Chengdu, Sichuan 610041, China.
Microgel preparation The chemical structure of the proposed PNG-CD microgels is shown in Fig. 1.
Fig. 1 Schematic illustration of the chemical structure of PNIPAM microgels with β-CD moieties and the molecular-recognition property.