Ferrous Content Research Articles

Selenium inhibits ferroptosis in ulcerative colitis through the induction of Nrf2/Gpx4

Background and aimSelenium, an essential micronutrient for human and has been reported to have a protective effect in ulcerative colitis (UC). However, the role of selenium in UC is unclear. Our aim was to investigate the mechanism of action of selenium in UC. MethodsSerum selenium levels were measured in UC patients and healthy controls. In addition, the effect of sodium selenite supplementation on experimental colitis in mice treated with dextran sulfate sodium (DSS) was investigated. The effect of sodium selenite on IECs ferroptosis was evaluated by observing the cell mortality, intracellular ferrous content, lipid reactive oxygen species and mitochondrial membrane damage in DSS-treated Caco2 cells. In addition, glutathione peroxidase 4 (Gpx4) and nuclear factor erythroid 2-like 2 (Nrf2) were detected in Caco2 cells and mouse intestines to explore their mechanisms. ResultsThe serum selenium content of UC patients was lower than that of healthy subjects. In addition, serum selenium levels were negatively correlated with disease activity. The in vivo results showed that selenium treatment could improve colitis induced by DSS and inhibit IECs ferroptosis. The in vitro results further showed that selenium inhibited the ferroptosis of Caco-2 cells induced by DSS. Nrf2/Gpx4 was up-regulated after selenium supplementation in vivo and in vitro. ConclusionsSerum selenium level is associated with IECs ferroptosis in UC patients. Selenium can relieve DSS-induced colitis and inhibit IECs ferroptosis by up-regulating the expression of Nrf2/Gpx4.

WD‐XRF technique for speciation of iron and quantification of its oxidation states in geological samples using L‐series of iron X‐ray spectrum

AbstractWavelength dispersive X‐ray fluorescence (WD‐XRF) spectrometry is a fast and widely used technique for elemental analysis of geological samples from Na to U. However, it has seldom been applied for quantitative determination of oxidation states of elements in complex matrices. In this study, we present a method to determine the oxidation states of iron in geological samples by WD‐XRF. We used the FeLα1,2 fluorescence line as a tool for iron speciation and Fe(II)/Fetotal ratio determination. We found that the normalized intensity (peak height) of FeLα1,2 fluorescence line was linearly correlated with the spin multiplicity (2S + 1) of ferrous and ferric content in the samples. To account for the matrix effects of chemical environment (matrix and chemical bonding) on FeLα1,2 fluorescence line, we introduced a chemical index factor (μ) that enabled accurate determination of Fe(II)/Fetotal ratio in different types of geological samples. The method was validated using international certified reference materials and their mixtures and obtained promising results, with only 6 out of 55 determinations showing relative error more than 5% of the certified values.

Silencing of long non-coding RNA SDCBP2-AS1/microRNA-656-3p/CRIM1 axis promotes ferroptosis of lung cancer cells.

Long non-coding RNAs (lncRNAs) play central roles in lung cancer progression by acting as competing endogenous RNAs (ceRNAs). This study aimed to explore the roles of lncRNA SDCBP2-AS1 in lung cancer and the molecular mechanism. The expression of SDCBP2-AS1, microRNA (miR)-656-3p, and cysteine-rich transmembrane BMP regulator 1 (CRIM1) was measured using quantitative real-time polymerase chain reaction. Ferroptosis was evaluated by analyzing cell death, ferrous content, reactive oxygen species (ROS) level, and protein levels of ferroptosis markers. The binding relationship was assessed using a dual-luciferase reporter assay. We observed that SDCBP2-AS1 was highly expressed in lung cancer cells. Knockdown of SDCBP2-AS1 promoted ferroptosis of lung cancer cells. SDCBP2-AS1 is a sponge of miR-656-3p, which directly targets CRIM1. Rescue experiments confirmed that SDCBP2-AS1 regulates ferroptosis by miR-656-3p, and overexpression of CRIM1 abrogated the effects of miR-656-3p on ferroptosis. In conclusion, depletion of SDCBP2-AS1 promoted lung cancer cell ferroptosis via the miR-656-3p/CRIM1 axis.

Developing a steady state wear equation for AA7050 hybrid composites/steel interface at elevated temperature

ABSTRACT In this research work, an attempt was made to reinforce AA7050/5Gr composites with multi-walled carbon nanotube (MWCNT) of varying weight percentages processed through stir casting route. SEM with EDS mapping revealed that the particles were uniformly distributed over the composites. Hardness reduces with increasing MWCNT weight percentage owing to the inverse hall petch effect and increment in void content. A third-body abrasion, which happens when the CNT in the aluminium matrix material detaches from the surface and erodes material from the composites pin as well as the counter face, causes the wear resistance to rise with the addition of CNT particles. A mechanically mixed layer, which avoids direct metal-to-metal contact and thus increases wear resistance, was created at the abraded surface and at high temperature, where the reduction of wear rate was due to the development of oxide protective layer. A steady-state wear equation for the contacting surface at high temperature (R = 1/Y √(ln W/2X)) for AA7050 hybrid composites–steel interface was developed. The enhancement in wear resistance was directly proportional to the proportion of ferrous content present on the surface, which was confirmed on the elemental analysis. Pock marks, micropits, craters and cracks were the features observed on the worn surface morphology, whereas delamination and plasticisation were the observed modes of wear mechanism.

Experimental Investigation on Bio-Machining of Nickel, Titanium and Nitinol (Shape Memory Alloys) Using Acidithiobacillus ferrooxidans Microorganisms

Micromachining plays a vital role in the manufacturing industry in producing microcomponents with high sensitivity and fine dimensional tolerances for implant materials in medical applications. Micro-machining can be carried out through various machining processes like physical, chemical and biological processes, although the use of biological machining is limited. In biological machining, microorganisms are used as a source of energy to machine the components, and machining with microorganism brings a lot of advantages in the machining process like the production of components with lower energy resources, low cost, no heat-affected zone and fine dimensional tolerances, which makes it suitable for machining implant materials. In other machining process like conventional and unconventional machining processes, the heat-affected zone, dimensional tolerances and environmental-related problems are the major issues, as these processes generate more heat while machining. This damages the material, which will not be able to be used for certain applications, and this issue can be overcome by bio-machining. In this present work, nickel, titanium and nitinol are manufactured using the powder metallurgy technique. They are manufactured as a 10 mm diameter and 5 mm thick pellet. The fabricated nickel, titanium and nitinol shape memory alloys are machined with Acidithiobacillus ferrooxidans microorganisms to obtain a better material removal rate and surface roughness and to check the bio-machining performance by considering various parameters such as shaking speed, temperature, pH and percentage of ferric content for the future scope of biomedical applications. Considering these parameters, microorganisms play a vital role in the temperature, shaking speed and time of the bio-machining process, and it was observed that a better material removal rate and surface roughness are achieved at a temperature of 30 °C, shaking speed of 140 rpm and machining time of 72 h.

Iron precipitation under controlled oxygen flow: Mineralogical implications for BIF precursors in the Archean ocean

Banded iron formation (BIF) deposition in the Archean ocean is thought to have been initiated by the oxidation of dissolved iron into ferric primary precursor phases that descended through the water column and were deposited on the seafloor. Effective interpretation of the trace element and isotopic composition of BIFs in the geologic record requires an understanding of the identity and longevity of those precursor phases. Temporal and spatial variation in oxidant concentration and ocean chemistry may have driven precursor mineralogy. Furthermore, precursor phases may undergo transitions during descent and burial. This experimental study follows the evolution of iron mineralogy, speciation, and redox state during the precipitation of iron under variable oxygen fluxes and in fluids containing different iron-complexing anions (chloride, sulfate, and phosphate). Additionally, suspensions collected after incomplete oxidation were anoxically aged to simulate changes to precursor mineralogy during descent below the seawater redoxcline.Results from X-ray diffraction, sequential dissolution, colorimetric determination of Fe redox state, and Fe K-edge X-ray absorption fine structure spectroscopy showed that under all experimental conditions, intermediate precipitates collected before complete iron uptake contained mineralized ferrous iron. Purely ferric mineral assemblages were not observed until iron was removed from solution. In low-oxygen experiments, intermediate precipitates contained phases with stoichiometric Fe2+, including magnetite, vivianite, and green rust (GR). Chloride green rust (GR1) had more ferric iron than sulfate green rust (GR2) and more readily transitioned to magnetite via disproportionation. GR2 was stable over a broader range of iron uptake; magnetite appeared mainly as an additional oxidation product in sulfate solution. In high oxygen experiments, mineralized ferrous iron occurred in amorphous phases or as a non-stoichiometric component in ferric oxides; final ferric assemblages were less crystalline than in low-oxygen equivalents.Low concentrations of phosphate increased the total iron oxidation rate, but also increased the ferrous content of intermediate precipitates. The incorporation of phosphate stabilized GR2 and facilitated GR2 precipitation over a larger range of iron uptake. In higher concentrations of phosphate, vivianite and poorly crystalline ferric hydroxides formed in place of GR. These findings suggest that over a range of possible ocean chemistries, mixed-valence phases may have been short lived but relevant precursors to BIF. Additionally, anionic chemistry and oxidant concentration are shown to influence the crystallinity and chemical resistivity of final ferric assemblages, affecting their reactivity during later anoxic burial.

Study on the Application of the GTAW Process in Strengthening the Welding Quality of Short Duplex Stainless Pipe

This study focuses on the results of the welding process when the Taguchi method is added to the design of experimental welding parameters when creating the welding procedure for gas tungsten arc welding (GTAW) by ASME Code for duplex stainless steel (UNS31803). A Vickers hardness tester is employed to collect and convert the tensile strength data for each test piece (weld bead, base material, and heat-affected area). A ferritic rate meter can quickly determine the ferric contents, which affect corrosion resistance and susceptibility to cracking. The test data are entered into the Taguchi technique to analyze the influence of each component on the welding quality. The L9 (34) orthogonal table is used to design the parameters for the experiment. We fixed the same shielding gas and flow rate. Backing gas at root, workpiece clamping angle, heat input, and interlayer temperature are employed as control factors for the four essential variables of the GTAW process. The ideal set of quality analysis and optimization parameters can be found. The welding parameters could be used to improve the welding quality of thin and short duplex stainless steel pipe fittings during argon welding.

Innovative Plant-Based Mordants and Colorants for Application on Cotton Fabric

ABSTRACT Sustainable Development Goals (SDGs) promote the utilization of renewable materials and processing methodologies for achieving circularity in the fashion industry production. Hence, the research was initiated to investigate the innovative and renewable plant-based sources of mordants and colorants for textiles that benefit the environment and human health alike. The research examinations established mugwort herb, rue herb, black cherry stems, and hops flower as a sustainable and innovative source of mordants and colorants on cotton fabrics. The Atomic Absorption Spectrometry (AAS) analysis of 6% stock herbal infusions identified the highest levels of copper and ferrous content in hops flower, and black cherry stems of 6.5 mg/l and 11 mg/l respectively as a prospective renewable and innovative source of mordants and colorants. Their applications on textiles would prevent the fatal mining and depletion of mineral ores of copper and ferrous elements, and metal toxicity to the ecosystem would be combated. Very good rub fastness and wash fastness to color staining, on the other hand, fair lightfastness ratings were gained. The cotton fabrics pre-treated with black cherry stems and colored with hops flowers exhibited the minimum transmittance percentage in the UVB region at 12.98% therefore practically appropriate for summer wear. Evaluation of ecological parameters, ATR-FTIR study of herbs and their treated fabrics, and Life Cycle Analysis is recommended for future work.

Evaluation of animal- and green manures co-application on soil micronutrients and yield of sesame (Sesamum indicum L.) in organic farm condition

This study was conducted to evaluate effects of organic fertilizers on micronutrients status of soil and yield of sesame. Research was performed in split-plot design based on a randomized complete block design with three replications. The experimental treatments included animal manure as main factor at three levels (0, 10, and 20 t ha−1) and application of green manures as sub factor at four levels (no green manure, Berseem clover, Fenugreek, and Vicia villosa). The results showed by application of animal manure, copper (Cu), zinc (Zn), manganese (Mn), and ferrous (Fe) contents in the treatment of 20 t ha−1 of animal manure were about 27, 22, 7.5, and 6% higher than the control treatment, respectively. The soil analysis showed in the post-harvesting stage of sesame 2.7% Cu and 29% Zn were stored in the soil. While the amounts of Fe 11% and Mn 71% in the soil were less than pre-planting of sesame. In general, fenugreek green manure application increased the amounts of micronutrients of soil more than the other green manures and animal manure individually. The highest total dry weight (10720.0 kg ha−1), grain yield (1929.4 kg ha−1) and oil yield (946.8 kg ha−1) were observed in the 20 t ha−1 of animal manure and Fenugreek of green manure treatments, which were about 44, 52 and 50% higher than the non-application of animal and green manures treatments, respectively. In general, the application of organic manures increased sesame yield by improving the physico-chemical properties and the amount of soil micronutrients.

Sustainable application of novel herbs on cotton fabrics as biomordants and colourants

The textile industry is ambitiously parading towards circularity and curtailing its dependency on fossil fuels hence the instigated research that adheres to Sustainable Developmental Goals (SDGs) and benefits the environment and human health alike. The current research experimented with innovative sources of plant-based biomaterials namely dandelion leaves, bilberry leaves, nettle leaves, and violet herb for application on cotton fabric as biomordants and colourants. The AAS analysis of mild 6% herbal solution revealed ferrous content of 6.78 mg/l in violet herb and 5.03 mg/l of the copper content in dandelion leaves applicable on cotton fabrics as biomordants thereby preventing the depletion of copper and ferrous elements mineral ores. A fair lightfastness rating and good to very good wash and rub fastness test results were obtained individually. The maximum K/S value of 13.95 was gained on cotton fabrics treated with a mild herbal infusion of bilberry leaves and coloured with violet herbs. The ATR-FTIR peak analysis noted strong = C-H bend of alkenes, strong C = O stretch of α and β unsaturated esters, and strong C-O stretch of carboxylic acids functional groups in raw herbs and its treated cotton fabrics. The dissolved oxygen (DO), oxidation–reduction potential (ORP), and potential of Hydrogen (pH) values were found in the acceptable range for all the spent solutions left after colouration of cotton fabrics with violet herbs hence sustainable. The data set obtained was statistically validated with ANOVA one-way test. Life cycle analysis and clinical investigation on potential therapeutic benefits of herbal fabrics to the wearer are suggested for future research and development.

ИЗУЧЕНИЕ КЕРАМИКИ ПЕРВОЙ ПОЛОВИНЫ XX ВЕКА С ТЕРРИТОРИИ ТАБУНСКОГО РАЙОНА АЛТАЙСКОГО КРАЯ

The article presents the results of a technical and technological study ceramics of the first half of the 20th century, originating from two now defunct settlements of the Tabunsky district ofthe Altai Territory: the village ofYamki and the village ofGrigorievka. It has been established that most of the investigated vessels were made of clays of medium and strong ferrous content, of various plasticity. Two recipes for molding masses have been recorded. The products were fired at high temperatures with oxygen access. Comparison of these collections with previously studied samples suggests that pottery dating from the first half ofthe 20th century from various settlements ofthe Tabunsky district ofthe Altai Territory was generally identical, and probably came from the same sources.

Obtention and Characterization of Ferrous Chloride FeCl2·4H2O from Water Pickling Liquors

As a hazardous waste, water pickling liquors must be properly treated. An alternative consists of promoting the formation of ferrous salts from this residue due to their higher ferrous content. Since FeCl2·4H2O is widely used in several applications, obtaining pure crystals of this material appears to be an interesting prospect. However, this compound has scarcely been investigated. In the present work, FeCl2·4H2O crystals were obtained from water pickling liquors. Their structural and morphological characteristics were investigated by X-ray diffraction, scanning electron microscopy as well as Mössbauer spectroscopy. In addition, the photoluminescence study of the obtained samples was also assessed. It was observed that after some aging time, the obtained crystals changed in colour from green to more yellowish. As such, the aged sample was also evaluated, and their structural characteristics were compared with the original crystals. Despite this, the obtained crystals exhibit a FeCl2·4H2O structure, which is not modified with the aging of the sample.

Abiotic dechlorination in the presence of ferrous minerals

Laboratory batch experiments were performed to assess the reduction of trichloroethene (TCE) and oxygen via natural ferrous minerals. TCE reduction under anoxic conditions was measured via the generation of reduced gases, while oxygen reduction via the generation of hydroxyl radicals was measured as a surrogate for potential TCE oxidation. Results showed that TCE reduction under anoxic conditions was observed for ankerite, siderite, and illite, but not for biotite; acetylene was the primary identified dechlorination product. With the exception of biotite, first-order dechlorination rate constants increased with increasing ferrous content of the mineral, with rate constants ranging from 3.1 × 10−8 to 4.8 10−7 L g−1 d−1. Measured reduction potentials (mV vs SHE) ranged from −104 for illite to +84 for biotite. When normalizing measured first-order dechlorination rate constants to the estimated ferrous iron mineral specific surface area (where surface area was based on nitrogen adsorption analysis of the minerals), TCE dechlorination rate constants increased with increasing reduction potentials. Under oxic conditions, hydroxyl radicals were generated with each of the four minerals. However, mineral activity showed no readily apparent correlation to ferrous content or mineral surface area. In terms of TCE and oxygen reduced per mole of ferrous iron initially present in each mineral, illite was the most reactive of the four minerals. Together, these results suggest that several ferrous minerals may contribute to abiotic dechlorination in the natural environment, and (at least for TCE reduction under anoxic conditions) measurement of ferrous mineral content and reduction potential may serve as useful tools for estimating TCE first-order abiotic dechlorination rate constants.

A literature review on the durability of ferrous and non-ferrous geopolymer concrete for sustainable developments

The usage of cement in concrete caused the release of CO2 emission which can cause global warming. Moreover, cement as main ingredient can result in depletion or even loss of limestone which serves as a water supplier for farmers. Geopolymer concrete does not use cement but industrial byproducts containing aluminate (Al) and silicate (Si) such as slag, fly ash, and metakaolin. Moreover, these materials are from industrial solid waste (slag) so that it becomes an added value for construction. This paper discusses the durability of geopolymer concrete with material derived from the ferrous and non-ferrous melting processes because of the lack of study in durability. In construction, the concrete durability is the main thing that must be considered. Durability analysis aims to make the concrete last a long time, especially in aggressive environments. It refers to high concentrated CO2 level in an urban area or marine environment that has sodium chloride and sodium sulfate levels. Increasing of non-ferrous content can lower total pore volume in geopolymer binder while the macropores are formed. High-calcium ferrous content addition has pore-enhancing effect. The lower the porosity, the lower the permeability in the concrete. It lowers the water content and compounds such as chloride absorbed in concrete. Chloride and CO2 diffusion can cause carbonation in concrete leading to corrosion in steel reinforcement and shrinkage. This literature study aims to enhance knowledge in concrete durability so building construction can last as the planned period. Hence, the utilization of natural resources as construction material can be more efficient.

Middle Bronze Age cemeteries, ‘double barrows’ and mortuary houses in the Upper Dniester Basin, Western Ukraine: Geophysical prospection and archaeological verification

AbstractThis article discusses two cases of so‐called double barrows from the Middle Bronze Age Komarów culture cemetery in Bukivna, in the Upper Dniester Basin (Ukraine), in order to demonstrate the potential of incorporating geophysical image analysis, excavations and sedimentological studies towards identifying subterranean funerary architecture. The magnetometer prospection of the Bukivna necropolis revealed the presence of a specific dipolar anomaly within the extent of a double barrow. The excavations uncovered burnt wooden‐clay constructions related to mortuary houses. The sedimentological samples collected from the features below the mound provided data for the increased ferrous content. Another double barrow located in the Pidhoroddia cemetery was prospected by means of magnetometry, which did not reveal any similar anomaly within the magnetometry plan, thus providing evidence for a possible lack of discussed mortuary structure.

Phytoplasma-induced biochemical and genetic variations in Crassula argentea

Phytoplasma is a plant pathogenic bacteria that causes several morphological abnormalities.This study reports on biochemical and genetic variability between the phytoplasma infected (PI) and symptomless Crassula argentea plants using RAPD markers. Chemical composition of normal plants was higher of all elements. However, change in ferrous (Fe) content was not significant between normal and abnormal plants. Infected plants had potassium content higher than normal plant. Also, chlorophyll contents were decreased by phytoplasma infection. Water content was higher in infected plant than normal plant The electrophoresis revealed a high level of polymorphism among the studied plants. A total number of 67 amplified bands were generated across the PI and symptomless plants with polymorphism percentage of 32.8. The primers OPC10, OPK05 and OPU05 yielded different polymorphic banding patterns that were unique to each primer and distinguishable over the PI and symptomless plants. RAPD molecular marker analysis revealed epigenetic variations between normal and phytoplsma infected plants, and itcould be utilized for the identification of Crassula genotypes.

Traditional Chinese Formula Xiaoyaosan Alleviates Depressive-Like Behavior in CUMS Mice by Regulating PEBP1-GPX4-Mediated Ferroptosis in the Hippocampus

BackgroundAt present, the pathogenesis of depression is not fully understood, and nearly half of depression patients experience no obvious effects during treatment. This study aimed to establish a depression mouse model to explore the possible role of ferroptosis in the pathogenesis of depression, and observe the effects of Xiaoyaosan on PEBP1-GPX4-mediated ferroptosis in the hippocampus.MethodsForty-eight male C57BL/6 mice were randomly divided into a control group, CUMS group, Xiaoyaosan group and fluoxetine group, and the model was established by chronic unpredictable mild stress (CUMS) for a successive 6 weeks. The medication procedure was performed from the 4th to the 6th week of modeling. The behavioral evaluations were measured to evaluate depressive-like behaviors. The expressions of GPX4, FTH1, ACSL4 and COX2 were detected as ferroptosis-related indicators. Then, the total iron and ferrous content in the hippocampus were measured. The levels of PEBP1 and ERK1/2 were observed, and the expressions of GFAP and IBA1 were also detected to measure the functions of astrocytes and microglia in the hippocampus.ResultsEight herbs of Xiaoyaosan had 133 active ingredients which could regulate the 43 ferroptosis-related genes in depression. After 6 weeks of modeling, the data showed that mice in the CUMS group had obvious depressive-like behaviors, and medication with Xiaoyaosan or fluoxetine could significantly improve the behavioral changes. The expressions of GPX4, FTH1, ACSL4, COX2, PEBP1, ERK1/2, GFAP and IBA1 changed in the CUMS group mice, while the total iron and ferrous content also changed. Xiaoyaosan and fluoxetine had obvious curative effects that could significantly alleviate the above changes in the hippocampus.ConclusionOur results revealed that the activation of ferroptosis might exist in the hippocampi of CUMS-induced mice. The PEBP1-GPX4-mediated ferroptosis could be involved in the antidepressant mechanism of Xiaoyaosan. It also implied that ferroptosis could become a new target for research into the depression mechanism and antidepressant drugs.

Determination of Ferrous Iron in Ferric Chloride Hexahydrate

Objective: As a pharmaceutical raw material, ferric chloride hexahydrate has been included in the British Pharmacopoeia, the European Pharmacopoeia (2008) and the United States Pharmacopoeia (2015), and there are detailed discussions on quality standards and testing methods. Ferric chloride hexahydrate has not been included in the Chinese Pharmacopoeia. This study is the part of research to establish a spectrophotometric method for the determination of ferrous iron in ferric chloride hexahydrate. In this study, the two methods were discussed in detail, and the spectrophotometric method for detecting the content of ferrous iron in ferric chloride hexahydrate was proposed. Methods: The detection method on ferrous iron in ferric chloride hexahydrate among European pharmacopoeia, United States pharmacopoeia and Chemical Reagent Ferric Chloride Hexahydrate (HG/T3474-2014) of China's Chemical Industry were compared. The last two methods were not easy to operation. On the basis of the European pharmacopoeia, a method was proposed that after Fe³⁺ were screened with H3PO4, Fe2+ was measured by spectrophotometry, and the method was verified by experiments. Results and Conclusion: The spectrophotometry method is easy to operate and has good reproducibility. The content of ferrous iron can be calculated semi-quantitatively by masking ferric iron with H3PO4 and spectrophotometric determination of ferrous ion content. Therefore, the method established in this study can more clearly detect whether the ferrous content in ferric chloride hexahydrate is up to standard.

ТЕХНИКО-ТЕХНОЛОГИЧЕСКОЕ ИЗУЧЕНИЕ КЕРАМИКИ 1-Й ПОЛОВИНЫ XX В. С ТЕРРИТОРИИ ТАБУНСКОГО РАЙОНА АЛТАЙСКОГО КРАЯ

The article is devoted to the publication ofmaterials of a technical and technological analysis of ceramics discovered on four nowadays non-existent settlements, founded during the Stolypin reforms, on the territory of the modern Tabunsky district of the Altai region. As a result of the study, it was found that ceramic products from clays of medium and strong ferrous content, of various plasticity prevailed there. Three recipes for molding materials have been founded. Most of the products were fired at high temperatures with oxygen access. Most of the crockery were not subjected to additional surface treatment; glazed items are also found, one vessel was ornamented. The data obtained agree with the available written and ethnographic sources. Further work on the technical and technological analysis of “Russian” ceramics, as well as conducting archaeological and ethnographic research, can provide more complete information about the level of development of pottery production in Altai, as well as reveal the specifics and local features of different districts. Keywords: pottery, ceramics, first half of the 20th century, altai, technical and technological analysis

Development of models for estimating specific energy and specific wear rate of circular diamond saw blades based on properties of carbonate rocks

This paper presents an experimental study to assess the effects of physical and mechanical properties of carbonate rocks and diamond/metal matrix characteristics on performance and tool life of segmented circular sawblades. For this purpose, pertinent rock properties including strength, hardness, abrasivity, water absorption, porosity and unit weight were measured by laboratory tests and compiled into a database for subsequent analysis. The testing program including using six commercially available sawblades with different segment compositions in full scale tests. The related characteristics of the sawblades were diamond concentration, Vickers hardness of the hard facing matrix, mean diamond grain size, cobalt, tin, copper, and ferrous content. Thirteen different carbonate rocks including marble, limestone, and travertine samples from various sites in Turkey were used in the experimental program. The experimental data was analysed by multiple linear and nonlinear regression analysis to develop models for estimation of specific energy (SE) and specific wear (SW) rates using rock properties and sawblades segment parameters. The proposed models were validated by comparing the results of their prediction with those of actual test results and showed good agreements. The concept of optimum total (cutting) cost (OTC) estimation for natural stone cutting is also discussed in the context of estimating sawblade wear life.