Physical Properties Of Water Research Articles

Water-surface photovoltaic systems have affected water physical and chemical properties and biodiversity

The implementation of water-surface photovoltaic systems as a source of renewable power has expanded rapidly worldwide in recent decades. Water-surface photovoltaic avoids negative impacts on terrestrial ecosystems, while the impacts on aquatic physical and chemical properties and biodiversity are unclear. To understand the ecological and environmental impacts of water-surface photovoltaic systems, here we conducted a field survey on water physical and chemical properties, plankton and bird communities of 26 water-surface photovoltaic systems in the Yangtze River basin in China during the winter and summer of 2022. We found that water-surface photovoltaic systems decreased water temperature, dissolved oxygen saturation and uncovered area of the water surface, which caused a reduction in plankton species and individual density, altering the community composition. Water-surface photovoltaic systems also caused an overall decrease in bird diversity and changed bird community compositions. These findings suggested that water-surface photovoltaic systems have impacts on the water environment and ecology. Since water-surface photovoltaic systems will continue to expand in the future, our results emphasize that rational planning is critical for the sustainable development of water-surface photovoltaic systems and the protection of the aquatic environment and biodiversity.

Spatial Distribution of Physical and Chemical Properties of Deep Sea Water in Xisha, South China Sea

Deep sea water (DSW) is a globally utilized source of renewable energy and other resources. To understand the characteristics of DSW resources in the South China Sea, in July 2022, the Guangzhou Marine Geological Survey (GMGS) investigated temperature, salinity, pH, dissolved oxygen (DO), inorganic salts (DIN, PO43−-P, and SiO3-Si), heavy metals (Hg, Pb, As, and Cd), trace elements (Cu, Zn, Fe, Mn, Ni, Se, and Mo), and other related indicators. The results of this investigation elucidate the horizontal and vertical changes in the physical and chemical properties of deep sea water in the Xisha Sea. The surface seawater quality in Xisha was found to be excellent and to meet first-class seawater survey standards. However, the concentrations of various nutrient salts in the surface layer were relatively low. As the seawater depth increased, different trace elements and heavy metals exhibited variations, and the concentrations of various nutrients also gradually increased.

Влияние приемов орошения на структуру почвы и продуктивность посевов яровой пшеницы в сухостепном Поволжье

Irrigation plays a key role in preserving land fertility and ensuring the growth of crop yields in the arid conditions of the dry-steppe zone of the Volga region. This factor primarily limits the volume and stability of crop production. The article presents the results of studies on the study of various irrigation techniques - watering along the strips and irrigation by sprinkling. An analysis was carried out on the effect of the applied irrigation methods on the soil structure and productivity of spring wheat crops. It was found that irrigation methods had different effects on the factors of changing the water-physical properties of the soil and the spring wheat crop. The most effective in terms of productivity of spring wheat grain - a yield of 1.74 t/ha was detected during irrigation with sprinkling using wide-grip sprinklers. Irrigation in strips is less expensive, but the productivity of spring wheat is less with this type of irrigation - 1.16 t/ha. When watering along the strips immediately after the first watering, the overall duty cycle decreases. When watering by sprinkling, water-resistant units pass into the category of sprayed only by the end of the vegetation of spring wheat. Thus, strip watering had the most negative impact on the structure of dark chestnut soil under spring wheat crops. With this version of irrigation, erosion processes begin to develop to a greater extent.

Effect of In Situ Polymerization of Super Absorbent Polymers on the Protection of Earthen Heritage Sites in Semi-Arid Regions

As precious cultural heritage, earthen sites are susceptible to various natural factors, leading to diverse forms of degradation. To protect earthen sites, the effects of super absorbent polymers (SAPs) on soil water retention, physical properties, and color compatibility at different concentrations were studied. After applying SAP treatment to an earthen site with different degrees of weathering, we drew the following conclusions. SAP-2 improved soil water retention capacity, increased soil water content, and slowed down the precipitation of soluble salts. At the same time, SAP-2 had the least effect on soil color difference and reduced the development of cracks by filling soil pores and enhancing the cohesion between soil particles, thus giving the earthen sites better weathering resistance. Therefore, the results provide a useful reference for the surface cracking of earthen sites in semi-arid areas and the degradation caused by flaking and block spalling.

Spatial Variability in Soil Water-Physical Properties in Southern Subtropical Forests of China

Quantification of soil water-physical properties and their spatial variation is important to better predict soil structure and functioning, as well as associated spatial patterns in the vegetation. The provision of site-specific soil data further facilitates the implementation of enhanced land use and management practices. Using geostatistical methods, this study quantified the spatial distribution of soil bulk density (SBD), soil moisture (SM), capillary water-holding capacity (CWHC), capillary porosity (CP), non-capillary porosity (NCP), and total porosity (TP) in southern subtropical forests located at the Tropical Forest Research Center in Pingxiang City, China. A topographic map (scale = 1:10,000) was used to create a grid of l km squares across the study area. At the intersections of the grid squares, the described soil water-physical properties were measured. By calculating the coefficient of variation for each soil water-physical property, all measured soil water-physical properties were found to show moderate spatial heterogeneity. Exponential, gaussian, spherical, and linear models were used to fit the semivariograms of the measured soil water-physical properties. Across all soil water-physical properties, the range A0 variable (i.e., the separation distance between the semivariance and the sill value) measured between 3419 m and 14,156 m. The nugget-to-sill ratio ranged from 9 to 41%, indicating variations in the level of spatial autocorrelation among the soil water-physical properties. Many of the soil water-physical properties were strongly correlated (as assessed using Pearson correlation coefficients). Spatial distribution maps of the soil water-physical properties created via ordinary kriging (OK) showed that most water-physical properties had clumped (aggregated) distributions. SBD showed the opposite spatial pattern to SM and CWHC. Meanwhile, CP and TP showed similar distributions.

The influence of aquatic activity on osteoarthritis

© 2024 Medical University of Lublin. This is an open access article distributed under the Creative Commons Attribution-NonComercial-No Derivs licence (http://creativecommons.org/licenses/by-nc-nd/3.0/) Abstract Introduction. In 2020, osteoarthritis (OA) affected up to 595 million people in the world, which is 7% of the population. Three quarters of them are over 55 years old and 60% are women. The pathophysiological basis of degenerative disease is a disturbance in the balance between the processes of formation and degradation of articular cartilage. Additionally, degeneration processes affect other elements of the musculoskeletal system, such as the synovial capsule, ligaments and muscles around the joint. Due to the severe pain, degenerative disease leads to a significant reduction in the quality of life and limited mobility. In the final stage it leads to disability. Arthritis most often involves the knee, hip joints, arms as well as vertebral column. To slow down the degenerative processes and minimize the complications of the disease, effective preventive methods should be implemented as soon as possible. Especially since there is currently no effective drug available for this disease. A popular method of combating pain is aquatic activity. The physical properties of water have a positive effect on the musculoskeletal and nervous systems. This review article assessed the effectiveness of aquatherapy depending on risk factors and the stage of osteoarthritis. Aim. Review and presentation of the current state of knowledge about water exercises on the course of osteoporosis, taking into account groups at risk of degenerative disease. Material and methods. Analysis of the studies available on open access sources at PubMed, Google Scholar, National Library of Medicine and Coachrane. The research was conducted through word analysis key words such as: “arthritis”, „aquatic activity”, „osteoarthritis”. Selection criteria for articles included consideration of their title, abstract, and publication date, with a focus on English-language publications. Conclusion and Results.This article demonstrates the positive impact of water exercises on the course of osteoporosis, as well as their preventive effect. The relationship between hydrotherapy and OA in individual risk groups was presented. Aquatic activity has been shown to be effective in inhibiting degenerative processes, reducing joint stiffness, improving walking distance, and mental condition. Keywords: osteoarthritis, aquatic activity, arthritis, WOMAC, degenerative disease, DALY.

Influence of «ORGANIC MAX» organic fertilizer on soil condition in Zakarpattia

With a shortage of traditional organic fertilizers and a constant increase in the cost of mineral fertilizers, it is important to find alternative environmentally friendly sources of nutrients. The effectiveness of the new organic fertilizer «Organic MAX», made on the basis of lignite (brown coal) and chicken droppings in the conditions of Zakarpattia region, which provides positive changes in the agrochemical criteria of the soil, has been proposed and studied. Under the influence of bird droppings, the humic substances of lignite go into a physiologically active state and effectively act as plant growth stimulants and sources of nutrients. According to the results of field studies, there is an increase in the effectiveness of this fertilizer with an increase in the content of animal waste: «Organic MAX–20» (lignite + 20% chicken droppings) and «Organic MAX–30» (lignite + 30% chicken droppings). It was found that the application of this fertilizer at a rate of 1 t/ha provided an increase in the content of organic soil matter (humus) by 0.05% for pure lignite, by 0.19% for Organic MAX–20 and by 0.66% for Organic MAX–30. There was also an increase in the content of nutrients: easily hydrolyzed nitrogen by 14.1–55.9 mg/kg; mobile phosphorus compounds at 64.5–109.3 mg/kg; mobile potassium compounds at 64.9–125.5 mg/kg. The effective effect of the fertilizers applied for the next year was revealed despite the high level of nutrient removal by a crop such as corn. The humic component is a nutrient medium for soil bacteria. The active work of microorganisms is the main link in the process of humus formation. After fertilization, there is an improvement in the water-physical properties of the soil, an increase in microbiological activity, as well as a decrease in the negative impact of adverse factors on the development of plants. On acidic soils, first of all, liming must be carried out before fertilizing. The type of this fertilizer is chosen for a specific crop after conducting agrochemical analyzes of the soil. The most effective application of these fertilizers on low-humus low-fertile soils, as well as non-structural ones, since they contribute to the optimization of soil properties. Its use is economically and environmentally feasible. It is possible to recommend environmentally friendly organic fertilizer «Organic MAX» for use in organic farming, the popularity of which in Ukraine is growing every year, to resume soil fertility.

ТРАНСФОРМАЦИЯ ПЛОДОРОДИЯ ПОЧВ ЗАЛЕЖЕЙ ЛЕСОСТЕПНОЙ ЗОНЫ ПРИ РАЗЛИЧНОМ НАПРАВЛЕНИИ ИХ ИСПОЛЬЗОВАНИЯ

The purpose of research is to provide a comprehensive comparative assessment of the fertility of gray fallow soils in the forest-steppe zone of the Krasnoyarsk Region, overgrown with forest, used for hayma-king and re-developed into arable land. The studies were conducted in 2007–2020 in the Krasnoyarsk and Achinsk-Bogotol forest-steppe on gray soils of fallow lands no longer used for agricultural purposes. Stu-dies were carried out to assess the indicators of the potential and effective fertility of gray soils of fallow lands of the Krasnoyarsk and Achinsk-Bogotol forest-steppe with their various post-agrogenic use. It has been established that forests regenerated on fallow lands do not lead to degradation of soil fertility, especially in terms of the content of humus and agronomically valuable aggregates. The emerging forest litter and tree litter accelerate the accumulation of organic matter, a source of humus. There is weak spatial va¬riation in most indicators of effective and potential fertility in soils under regenerating forest compared to pure fallow lands. With the re-involvement of fallow land into arable land, nitrification somewhat increases, spatial variation in soil properties decreases, and the content of humus and absorbed bases decreases. The structural composition of the soils of all study objects is characterized as excellent (ACF 88–77 %) with an insignificant value of the coefficient of variation of fractions (4–7 %). When reclaiming fallow lands into arable land, the proportion of the blocky fraction is significantly reduced. The spatial variability of the structural composition of soils in fallow lands and hayfields is higher than on arable land, which is asso¬ciated with the “clumpiness” of the ground cover and root system of plants on uncultivated soils. In terms of fertility, post-agrogenic gray soils used for haymaking occupy an intermediate position between clean fallow lands and those overgrown with forest. The productivity of the phytomass of fallow lands, arable land and hayfields in the Krasnoyarsk and Achinsk-Bogotol forest-steppe is more closely correlated with the indicators of the potential fertility of post-agrogenic gray soils. In most cases, the values of the correlation coefficients are closer between phytomass reserves and indicators of effective fertility in the Achinsk-Bogotol forest-steppe, which is associated with more favorable hydrothermal conditions in this research area and optimal water-physical properties.

Исследование закономерностей изменения солевого состава буровых шламов в процессе их утилизации

Drill cuttings in their natural state have viscous-plastic properties; in a dry state they are cohesive and hard. This is due to the content of sodium ions in the absorbing complex. Features of the physical and mechanical properties of drill cuttings indicate its ability to absorb and retain dissolved salts. When gypsum is added to drill cuttings in different percentages of the waste volume, the concentration of chloride ion changes in all samples, and chloride-sulfate salinization is observed. The content of sulfate ion increases with a minimum volume fraction of gypsum application. The addition of gypsum in a volume fraction of 15 and 20% affects the reduction of phosphate and carbonate ions. A change in electrical conductivity indicates an increase in the concentration of water-soluble salts in the water extract, which is confirmed by a direct high correlation. When adding gypsum from 7–20% volume fractions, a significant reduction in the dense residue occurs. The use of gypsum increases the filtration capacity of drill cuttings. The use of gypsum makes it possible to lighten the granulometric composition of drill cuttings due to the active coagulation of colloids. As a result of the removal of water-soluble salts, optimal water-physical properties of drill cuttings are created, structuring and filtration properties of drill cuttings are increased. A mathematical model for predicting the dissolution of salts in drill cuttings allows taking into account uncontrollable factors (density, particle size distribution, filtration coefficient, content of water-soluble salts).

Non-surgical pain management for hip joint disease in veterinary medicine.

The most common orthopaedic developmental disease in dogs is hip dysplasia. This condition results in coxofemoral laxity due to incongruity and lack of stabilisation of the joint by the soft tissues. Currently, there is no therapeutic plan to correct hip dysplasia without surgical intervention at a very early age. The goal of the non-surgical treatment is to relieve pain and stiffness and to increase the muscle strength, usually through hydrotherapy and the beneficial physical properties of water. Recently, there has been growing interest in regenerative medicine, which involves the use of mesenchymal stem cells (MSCs) and their products to alleviate the characteristic clinical symptoms of osteoarthritis (OA). In vivo studies with canine MSCs have shown that an intra-articular injection of MSCs into cartilage lesions leads to the excellent regeneration of the hyaline cartilage. Regenerative medicine has undergone rapid development in recent years thanks to new therapies based on the application and combination of innovative biomaterials. One of the first known regenerative methods to be used in clinical practice was platelet-rich plasma (PRP). This review summarises the use and potential of MSCs and PRP, including their in vitro properties, their therapeutic effects in the treatment of cartilage lesions in preclinical in vivo studies, their clinical efficacy in the treatment of naturally occurring OA in dogs, and the current limitations of the studies.

Analysis Of The Potential Of Volcanic Aquifers In Supporting The Development Of Groundwater Resources In Bogor District, West Java

This research is crucial for understanding the aquifer potential of volcanic deposits as a sustainable groundwater source, especially in regions experiencing rapid urbanization and agricultural expansion. It aims to analyze the aquifer potential of volcanic deposits in Bogor Regency, focusing on the Bogor Groundwater Basin, the upper Cisadane watershed, the eastern slopes of Mount Salak, and the western slopes of Mount Pangrango. The methods used include secondary data collection from regional geological maps and primary data collection through field surveys, geological mapping, and hydrogeological mapping. The results show that the volcanic rock units in this area, consisting of stony tuff, tuff breccia, lava, and andesite lava, have unique characteristics with significant potential as aquifers. Detailed geomorphological and hydrogeological mapping revealed different types of springs and physical properties of water that support the sustainability of groundwater resources. These findings contribute significantly to the development of better groundwater management policies, effective water infrastructure development, and environmental conservation strategies in Bogor District, ensuring clean water availability for the future.

Effectiveness of use zeolite in vegetable growing in the footdown zone of southeast Kazakhstan

Natural zeolite from the Shankanay deposit is effective for use as an additive to mineral fertilizers when growing vegetable crops in the foothill zone of south-east Kazakhstan. Zeolite added to the soil with mineral fertilizers leads to an increase in the water-physical properties of dark chestnut soil. The water permeability of these options has increased noticeably. The use of zeolite and fertilizers helps to increase the mobile forms of nitrate nitrogen, mobile phosphorus and exchangeable potassium. The addition of zeolite reduces the concentrations of mobile forms of heavy metals in the dark chestnut soil under study. Thus, the concentration of cadmium in the soil in a 0-20 cm layer under sowing table beets when using 2 tons of zeolite decreased by 50% with a control value of 1.0 mg/kg, which does not exceed the maximum permissible concentration.A positive effect of zeolite fertilizer on the productivity of vegetable crops was revealed, which makes it possible to increase the total yield of table beet roots from 42.8 t/ha in control to 43.3-62.7 t/ha in fertilized variants with an increase in yield from 4.4 t/ha up to 19.9 t/ha. The yield of cabbage was 25.7 t/ha on the control, and increased by 6.5-16.5 t/ha on the fertilized variants. The use of zeolite and fertilizers contributes to the production of vegetables with good and high quality indicators. Application of both zeolite and fertilizers increased the dry matter, sugar and vitamin C content of the studied crops. The amount of nitrates in the products decreased with the addition of zeolite and increased in other variants of the experiment, but did not exceed the maximum permissible concentration. Thus, in the control variant, the nitrate content in cabbage heads was 223 mg/kg wet weight, in the variants with zeolite 2t/ha - 205 mg/kg, in beetroots - 248 mg/kg and 195 mg/kg, respectively.

Sustainable pectin-based film for carrying phenolic compounds and essential oil from Citrus sinensis peel waste

Currently, food science faces the challenge of finding methods to deliver functional and nutritional compounds in ready-to-eat products. Biopolymeric films enriched with essential oils are an emerging strategy for incorporating valuable components into edible carrier matrices. This study investigated the wastewater from orange peel hydrodistillation as a source of phenolic compounds and an innovative ingredient to develop bioactive limonene-loaded pectin-based films, addressing waste disposal challenges by developing a multi-functional packaging material. The objective was to evaluate the effects of formulation synergies, particularly pectin-phenolic interactions, on the physicochemical, rheological properties, and essential oil retention capacity of film-forming emulsions, and then assess the effects on the physicochemical and mechanical properties of the films. Films were analyzed for morphology, water vapor permeability, light transmittance, mechanical, chemical, and physical properties, and encapsulation efficiency. Three formulations were evaluated: pectin control (PC), pectin with Tween-80 surfactant (PT), and pectin with phenolic-rich wastewater (PPW). PPW emulsions displayed higher viscosity, consistency, kinetic stability, and essential oil retention compared to PC. The resulting environmentally-friendly films exhibited increased thickness, improved oil droplet distribution, a more crystalline structure, lower clarity, better flexibility, and increased water vapor permeability. Altered FTIR spectrum bands suggested potential pectin-phenolic interactions, influencing film physicochemical properties through mechanisms such as enhanced crosslinking. The PT film-forming emulsion demonstrated lower kinetic stability and less homogeneity than PC and PPW, showing that the use of the commercial surfactant (0.1g/100 g of film-forming emulsion) led to less favorable performance in terms of emulsion stability and film properties compared to PPW and PC. Conclusively, utilizing orange residue for bioactive pectin-based films offers valuable insights for promoting shelf life, reducing the need for formulation surfactants, and adding nutritional value in food applications, while simultaneously repurposing underutilized waste. This research also contributes to insights into the development of more stable emulsions for creating uniform films.

Natural Factors of Microplastics Distribution and Migration in Water: A Review

Microplastics are widely present worldwide and are of great concern to scientists and governments due to their toxicity and ability to serve as carriers of other environmental pollutants. The abundance of microplastics in different water bodies varied significantly, mainly attributed to the initial emission concentration of pollutants and the migration ability of pollutants. The migration process of microplastics determines the abundance, fate, and bioavailability of microplastics in water. Previous studies have proved that the physicochemical properties of water bodies and the properties of microplastics themselves are important factors affecting their migration, but the change in external environmental conditions is also one of the main factors controlling the migration of microplastics. In this paper, we focus on the effects of meteorological factors (rainfall, light, and wind) on the distribution and migration of microplastics and conclude that the influence of meteorological factors on microplastics mainly affects the inflow abundance of microplastics, the physical and chemical properties of water, and the dynamics of water. At the same time, we briefly summarized the effects of aquatic organisms, water substrates, and water topography on microplastics. It is believed that aquatic organisms can affect the physical and chemical properties of microplastics through the physical adsorption and in vivo transmission of aquatic plants, through the feeding behavior, swimming, and metabolism of animals, and through the extracellular polymers formed by microorganisms, and can change their original environmental processes in water bodies. A full understanding of the influence and mechanism of external environmental factors on the migration of microplastics is of great theoretical significance for understanding the migration law of microplastics in water and comprehensively assessing the pollution load and safety risk of microplastics in water.

Application of Chitosan as a Coagulant- A Preliminary Review

One of the best water treatment methods is to use coagulant. Coagulation with metal salts like aluminium or iron salt are commercially use in the treatment of turbid sea water today. However, this type of coagulant might leave toxic residue in the treated water since it is made up from metal or inorganic material. Thus it might affect the health if the water is use for drinking and such else. Several studies on synthetic and organic polymer has been carried out in order to identify which polymer can works as a coagulant to replace the use of metal salts. Chitosan is natural polymer that can be used as a coagulant in the treatment of turbid sea water. Chitosan has been used at water purification system for detoxifying water. This might be due to its ability to form bond or coagulate with other particles. It is able to absorbs greases, oil, and other potential toxins and also have relatively lowest toxicity or risk for human since it is an organic. The contamination of water can affect both physical and chemical properties of water. Thus it is essential for the sea water to be treated to remove the turbidity so that the water can be used safely. There are many methods that can be used in the water treatment but may produce different properties of treated water. Some treated water may have poor microbiological quality which is unsafe to be use or consumed by human.

Zamzam Water Surpasses Global Standards in Quality and Mineral Content

This study investigates the physical, chemical, and bacteriological properties of Zamzam tap water and two popular bottled waters, "Rounaq" and "Naba' Al- Rayan," in Diyala Governorate. Conducted at Al-Rafidain University College and the Central Public Health Laboratory in Baghdad, the research analyzes taste, odor, color, pH, essential minerals, and bacterial contamination. Findings indicate that Zamzam water excels in sensory qualities and contains beneficial minerals like potassium and magnesium within safe limits, with no bacterial contamination detected. These results affirm Zamzam's superior quality and underline the necessity for regular quality checks of bottled waters to ensure public health safety. Highlights: Superior Sensory Qualities: Zamzam water was notably superior in taste, odor, and color compared to the other bottled waters tested. Mineral Content and Safety: All water samples contained essential minerals like potassium and magnesium within safe limits, confirming their nutritional value and compliance with health standards. Bacterial Purity: No bacterial or pathogenic contamination was detected in any of the water samples, ensuring their safety for consumption. Keywords: Zamzam Water, Bottled Water Quality, Mineral Content, Bacteriological Safety, Sensory Properties

Development of an innovative and original portable pipette with different filtration layers for water purification

The environment is the external environment in which living creatures on Earth constantly interact throughout their lives. Any negative situation that may occur in the environment greatly affects living life. Increasing industrialization and urbanization along with the ever-increasing population are the main causes of environmental pollution. Water pollution covers the negative effects on the physical, chemical or biological properties of water as a result of human activities. The pollution of water, which is of vital value for living things, due to different factors every day, causes the decrease in potable water resources. In our study, a portable pipette was designed to use different water sources as drinkable water. Four different filter layers were used in the pipette we designed. Filter layers used; coarse filter, activated carbon, magnetic nanoparticle and silver nanoparticle (AgNP). Magnetic nanoparticle and silver nanoparticle were synthesized within the scope of our study. The performance of the purification pipette we developed was investigated with samples containing methyl parathion at different concentrations. In our study, a UV-Vis spectrophotometer was used as an analysis device. As a result of the analyses, it was found that the pipette we developed could purify around 65%, regardless of the concentration of the analyte. The portable purification pipette we developed in our study is promising in terms of making water resources found in nature drinkable, especially in military operations.

Simulation of freezing a sea water droplet moving in a cold air

A rapid freezing of a sea water droplet moving in a cold air is modeled. A droplet freezing model is a key component needed for computational forecasting of ice accretion on surfaces of ships and other equipment operating in low-temperature regions. The freezing process consists of the three stages: 1) water cooling to the incipient solidification temperature; 2) liquid solidification; 3) further freezing of the primarily solidified droplet. An icy region, being formed during the 2nd stage, initially represents a slurry, composed of ice crystals suspended in water. Further cooling is associated with an increase in the crystal concentration that at a certain threshold causes slurry transformation into a spongy (porous) ice. The solidification stage model is composed of the three coupled differential equations formulated in the moving coordinate system. All the physical and thermophysical water properties, required for modeling droplet freezing, are calculated by using the empirical correlations. The set of the equations is solved numerically. The solidification process is illustrated by computational examples for different droplet sizes and water salinities. The computed icy region thickness vs. time, as well as temperature distributions and porosities along droplet radius at different time moments are shown.

Study of Some Physical and Chemical Properties of Saline Water from Several Wells in the Naameh Area

Study of Some Physical and Chemical Properties of Saline Water from Several Wells in the Naameh Area

Study on Phenol-Formaldehyde Resin-Montmorillonite Impregnation and Compression Modification of Chinese Fir.

In this study, a phenol-formaldehyde resin-montmorillonite intercalation composite solution was used as a modifier to treat Chinese fir via impregnation and compression. The basic characteristics and wettability of the PF (phenol-formaldehyde)-montmorillonite impregnation solution were analyzed. The effects of the solid content of PF, the quantity of montmorillonite, and the impregnation time on the impregnation weight gain of Chinese fir were studied through orthogonal experiments. The results showed that when the amount of montmorillonite was 1%, the wettability of the PF-montmorillonite impregnation solution performed the best, the curing time was short, and the curing strength was high. The optimal impregnation process consists of a PF solid content of 25%, an impregnation time of 120 min, and a montmorillonite ratio of 1%. Under these conditions, the modified Chinese fir was prepared via hot pressing. The effects of the addition of montmorillonite and different levels of compressibility on the physical and mechanical properties of modified wood were studied. The physical and mechanical properties were found to be better when the compression ratio was 33%: the density increased from 0.33 g/cm3 to 0.58 g/cm3; the surface hardness increased from 33.6 HD to 70.9 HD; the static bending strength increased from 60.4 MPa to 98.7 MPa; and the elastic modulus increased from 6 390 MPa to 11 498 MPa. After 30 days of release, the compression rebound rate was 3.97%. Meanwhile, the micromorphology and heat resistance of the impregnated compressed Chinese fir showed that the PF-montmorillonite impregnation solution entered into the cell cavity and intercellular space of the Chinese fir and formed a good composite, thus improving the water resistance, heat resistance, and physical and mechanical properties.