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Cole, Thomas B. "Group of Artists". JAMA 307, n. 7 (15 febbraio 2012): 642. http://dx.doi.org/10.1001/jama.2012.99.
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Green, Alison. "Citizen Artists: Group Material". Afterall: A Journal of Art, Context and Enquiry 26 (gennaio 2011): 17–25. http://dx.doi.org/10.1086/659292.
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Jing, Xiwei, Weiguang Gong, Zhongjun Feng, Xin Meng e Baicun Zheng. "Comb-like copolymer dispersant for PP/CaCO3 composites: effects of particle concentration on properties of composites". Journal of Polymer Engineering 37, n. 6 (26 luglio 2017): 607–16. http://dx.doi.org/10.1515/polyeng-2016-0290.
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Abstract A comb-like copolymer poly (styrene-co-maleic anhydride)-graft-poly (ε-caprolacton) (SMA-g-PCL, SP) with carboxyl group as an anchoring group and polycaprolactone as a solvent chain was used as an effective dispersant for CaCO3 in the polypropylene (PP) matrix. The effects of CaCO3 concentration on crystallization behaviors, mechanical properties, and thermal stabilities were studied systematically. The results revealed that the dispersion of CaCO3 in the PP matrix was markedly improved owing to the steric hindrance effect caused by PCL, and the SP-coated CaCO3 was a very effective nucleating agent for PP. Proper CaCO3 concentration corresponded to the improvement of crystallization temperature, crystallinity, and crystallization rate of PP. There was only a slight improvement in yield stress but great improvement in Young’s modulus, flexural modulus, and impact strength. However, the excessive CaCO3 filler deteriorated the mechanical properties. The good dispersion of SP-coated CaCO3 in the PP matrix also accounted for the improvement of thermal stability. The initial decomposition temperature of the PP/CaCO3 composite with 7.4 wt.% CaCO3 increased 35°C compared with neat PP.
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Pan, Chonggen, Jiawei Zang, Keyu Chen e Jingge Ren. "Study on the Properties of Cement-Based Cementitious Materials Modified by Nano-CaCO3". Applied Sciences 13, n. 4 (14 febbraio 2023): 2451. http://dx.doi.org/10.3390/app13042451.
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The effects of Nano-CaCO3 on the physical, mechanical properties and durability of cement-based materials were investigated in this paper. The mechanical property, durability and SEM microscopic tests of test blocks with different Nano-CaCO3 content were carried out. Results showed that Nano-CaCO3 could improve the flexural strength, compressive strength and impermeability of cement-based materials. When the content of Nano-CaCO3 is 2.0%, the strengthening effect of Nano-CaCO3 on the cement-based materials was optimized, and the flexural strength of cement-based materials after 3 d, 7 d and 28 d increased by 12.6%, 18% and 32.4%, respectively, compared with the reference group. When the content of Nano-CaCO3 exceeded 2.0%, the flexural strength of cement-based materials begins to decline with the increase of Nano-CaCO3 content. Similarly, when the content of Nano-CaCO3 reached 2.0%, the impermeability of the cement-based materials was also optimized, and the permeability height of the base group could be increases by 41.4%. At the early stage of hydration, the exothermic rate of cement with 2.0% Nano-CaCO3 content was higher than that of other contents. When the content of Nano-CaCO3 increased from 0 to 2.0%, the hydration exothermic rate increased gradually with the increase of Nano-CaCO3 content.
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Olszewska-Świetlik, Justyna, Bożena Szmelter-Fausek, Ewa Pięta e Edyta Proniewicz. "Spectroscopic and Gas Chromatographic Studies of Pigments and Binders in Gdańsk Paintings of the 17th Century". Journal of Spectroscopy 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/187407.
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This work presents spectroscopic (optical microscopy, OM; micro-Raman, Raman; and Fourier-transform adsorption infrared, FT-IR) and gas chromatographic studies of two famous panel paintings from the Gdańsk artists of the 17th century Golden Age, “Servilius Appius” by Isaac van den Blocke and “Allegory of Wealth” probably by Anton Möller. Application of the aforementioned methods allowed us to identify pigments and binders used in the panel paintings. In particular, it was determined that the yellow pigment used by both artists is lead-tin yellow type I (2PbO·SnO2), the white pigment is lead (II) carbonate hydroxide (2PbCO3·Pb(OH)2), and the ground layer material consist of chalk (CaCO3). The analysis showed also that in the case of “Allegory of Wealth,” the red layer consists not only of cinnabar (HgS) but also of lead-tin yellow type I.
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Saraswati, Widya, Nirawati Pribadi e Chaerun Mutmainnah. "Differences in the solubility of CaCO3 from blood clam shells and Ca(OH)2 as a candidate pulp capping material". Conservative Dentistry Journal 13, n. 1 (3 agosto 2023): 16–18. http://dx.doi.org/10.20473/cdj.v13i1.2023.16-18.
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Background: Calcium hydroxide (Ca(OH)2) is the gold standar in pulp capping treatment because the biocompatibility and capability to stimulate hard tissue formation and also antibacterial effect. However, this compound has the disadvantage of being easily soluble in saliva which will increase the risk of leakage in the cavity. Another alternative pulp capping material is calcium carbonate from blood clam shells. Blood clam shells contain 98% CaCO3, CaCO3 has low solubility and is difficult to dissolve in water due to the large ions on Ca2+ and CO32- so that the attractive force between these ions is very strong and finally H2O is not able to break down the CaCO3 compound to be dissolved. Purpose: Explained the differences in the solubility of calcium carbonate from blood clam shells and calcium hydroxide as candidates pulp capping materials. Methods: This research is a laboratory experimental study with a pretest-posttest control group design method. The samples consisted of 12 pieces of Ca(OH)2 and CaCO3 then divided into 2 groups and given treatment. Group 1 CaCO3 immersed in 1 day, group 2 Ca(OH)2 immersed in 1 day, group 3 CaCO3 immersed in 7 days, and group 4 Ca(OH)2 immersed in 7 days. Solubility is calculated according to the solubility formula. Data testing with Anova-Welch. Results: There was a significanly difference in the solubility rate between the CaCO3 dan Ca(OH)2 groups immersed for 1 day and 7 days on the Anova-Welch results (p<0.05). Conclusion: The solubility of CaCO3 in blood clam shells is lower than the solubility in Ca(OH)2.)
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Sturken, Marita. "Women Artists’ Group Fights Discrimination". Afterimage 25, n. 6 (maggio 1998): 5. http://dx.doi.org/10.1525/aft.1998.25.6.5.
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Fowler, Joan. "Women Artists Action Group Seminar". Circa, n. 41 (1988): 26. http://dx.doi.org/10.2307/25557339.
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Cummins, Pauline. "The women artists action group". Women's Studies International Forum 11, n. 4 (gennaio 1988): 403–4. http://dx.doi.org/10.1016/0277-5395(88)90093-3.
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Silva, Lenise Vargas Flores da, Jaqueline Ineu Golombieski e Bernardo Baldisserotto. "Growth and survival of silver catfish larvae, Rhamdia quelen (Heptapteridae), at different calcium and magnesium concentrations". Neotropical Ichthyology 3, n. 2 (giugno 2005): 299–304. http://dx.doi.org/10.1590/s1679-62252005000200008.
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Since the relative ratios of Ca2+ and Mg2+ can vary greatly from one water body to another, and lime used for the increase of water hardness or pH can have different ratios of Ca2+ and Mg2+ in its composition, the objective of this study was to analyze the growth and survival of silver catfish, Rhamdia quelen, larvae at different calcium and magnesium concentrations. After fertilization, eggs were randomly divided into 4 treatments (three replicates per treatment) with different concentrations of Ca2+ and Mg2+ at hardness values of 70 mg.L-1 CaCO3 (mg.L-1 : 5.2 Ca2+ and 14.12 Mg2+; 13.11 Ca2+ and 7.11 Mg2+; 20.26 Ca2+ and 2.86 Mg2+; 24.95 Ca2+ and 0.95 Mg2+) and 150 mg.L-1 CaCO3 (mg.L-1 : 5.2 Ca2+ and 32.70 Mg2+; 28.63 Ca2+ and 16.44 Mg2+; 44.68 Ca2+and 6.44 Mg2+; 62.78 Ca2+ and 0.95 Mg2+). There was also another group exposed to water hardness of 20 mg.L-1 CaCO3 (Ca2+ 5.2 mg.L-1 and Mg2+ 0.95 mg.L-1) at both experiments. The post-hatch larvae were transferred to continuously aerated 40 L polyethylene aquaria (400 larvae/tank) containing the same water as used for incubation. Samples of larvae were collected on days 0, 7, 14, and 21, and the length, weight, and specific growth rate were determined for each collection. Survival and biomass were calculated on day 21. At water hardness of 70 mg.L-1 CaCO3, the best survival and growth of silver catfish larvae was observed at water with 20.26 mg.L-1 Ca2+ and 2.89 mg.L-1 Mg2+, with similar results to the group exposed to water hardness of 20 mg.L-1 CaCO3. However, compared to the group exposed to water hardness of 20 mg.L-1 CaCO3, survival and growth were lower at 150 mg.L-1 CaCO3. Therefore, a hardness range of 20 to 70 mg.L-1 CaCO3 is recommended for silver catfish larviculture, but with 20.26 mg.L-1 Ca2+ and 2.89 mg.L-1 Mg2+ at 70 mg.L-1 CaCO3. Water hardness of 150 mg.L-1 CaCO3 is not recommended for this species.
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Djustiana, Nina, Mitha Amaranila, Nadia Greviana, Myrna Nurlatifah Zakaria, Sunarso e Arief Cahyanto. "Hardness Evaluation of Carbonate Apatite Cement Based on Various Ratio of Precursor". Key Engineering Materials 758 (novembre 2017): 52–55. http://dx.doi.org/10.4028/www.scientific.net/kem.758.52.
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Carbonate Apatite (CO3Ap) cement is considered as an ideal bone substitute due to its biocompatibility and osteoconductivity. Also, CO3Ap cement has the chemical composition that closes to natural bone. During cement preparation, precursors play an important role that affects the properties of CO3Ap cement. Cement hardness is one of the important properties that need to be evaluated before the obtained cement can be applied as a bone substitute. Therefore, the purpose of this study is to determine the effect of precursor ratio of CaCO3 and CaHPO4 on the hardness level of CO3Ap cement. In the present study, the CO3Ap cement was prepared from CaCO3 and CaHPO4. Both Commercial and synthesized CaCO3 were used. The CO3Ap cement obtained from commercial CaCO3 was used as a control group. Synthesized CaCO3 was obtained from Indonesian natural limestone. Three different CaCO3:CaHPO4 ratios, 40:60, 30:70 and 20:80 were mixed with 1 mol/L Na2HPO4. Samples were kept at 37°C with 100% relative humidity for 24 hours then tested using micro Vickers hardness testing machine. The micro Vickers hardness of the control group with CaCO3:CaHPO4 ratio of 40:60, 30:70 and 20:80 were 5.09 VHN, 6.34 VHN, and 6.73 VHN, respectively. Meanwhile, the micro Vickers hardness of the CO3Ap cement obtained from synthesized CaCO3 were 6.22 VHN, 7.50 VHN, and 10.37 VHN for the CaCO3:CaHPO4 ratio of 40:60, 30:70 and 20:80, respectively. The micro Vickers hardness level of CO3Ap cement precursor ratio from the lowest to the highest was 40:60 < 30:70 < 20:80. In conclusion, the precursor ratio significantly affects the hardness level of the CO3Ap cement. The hardness level of CO3Ap cement obtained from synthesized CaCO3 was higher compared with that obtained from commercial CaCO3.
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Silva, L. D., V. C. S. Amaral, M. C. Vinaud, A. M. Castro, H. H. A. Rezende, D. B. Santos, C. C. Mello-Silva e J. C. B. Bezerra. "Changes in energetic metabolism of Biomphalaria glabrata (Mollusca, Planorbidae) in response to exogenous calcium". Brazilian Journal of Biology 77, n. 2 (5 settembre 2016): 304–11. http://dx.doi.org/10.1590/1519-6984.13315.
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Abstract Calcium is considered an essential element for the metabolism of aquatic snail Biomphalaria glabrata (Say, 1818), intermediate host of Schistosoma mansoni Sambon, 1907 in Brazil, and represents a limiting factor to its distribution and adaptation to the environment. This study investigated the effect of different concentrations of exogenous CaCO3 on the energetic metabolism of B. glabrata for better understanding the physiological interference of chemical elements dissolved in the environment with the physiology of this species. Sixty-day-old snails were distributed into six groups, five exposed to different concentrations of CaCO3 (20, 40, 60, 80 and 100 mg/L) and a control group. The exposure to CaCO3 was assessed over time, with analysis of 15 snails of each group in the following intervals: 1, 14, 21 or 30 days for hemolymph extraction. Concentrations of calcium and glucose in the hemolymph were determined by commercial kits, and organic acids were extracted using an ion exchange column and analyzed by high-performance liquid chromatography. Concentration of calcium in the hemolymph showed no significant difference (p>0.05) from the control group and between the concentrations tested. Concentration of glucose decreased (p<0.05) in the treatments of exposure to 20 and 40 mg/L and increased when exposed to 80 and 100 mg/L CaCO3 compared to control and to other concentrations tested over 30 days. The organic acids pyruvate, oxaloacetate, citrate, succinate, fumarate, beta-hydroxybutyrate and lactate presented increased concentrations, while propionate and acetoacetate, decreased concentrations, when exposed to CaCO3 compared to control. Considering the influence of different periods of exposure to CaCO3, on the 14th day, there were stronger alterations in the metabolism of B. glabrata. In conclusion, exposure to CaCO3 reduced the concentration of glucose, which is metabolized into pyruvate, the final product of glycolysis, and also influenced the energetic metabolism pathways, indicating an aerobic or partially anaerobic functioning.
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Rawstrone, Annette. "We've explored…artists". Nursery World 2024, n. 2 (2 febbraio 2024): 28–29. http://dx.doi.org/10.12968/nuwa.2024.2.28.
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Diningsih, Candra, e Lydia Rohmawati. "SYNTHESIS OF CALCIUM CARBONATE (CaCO3) FROM EGGSHELL BY CALCINATION METHOD". Indonesian Physical Review 5, n. 3 (27 settembre 2022): 208–15. http://dx.doi.org/10.29303/ipr.v5i3.174.
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Calcium is an essential nutrient the human body needs to control blood pressure and maintain strong bones and teeth. One type of calcium that is often consumed and safe for health is calcium carbonate. It can obtain this material from chicken eggshell waste, where it is known that the CaCO3 content is 95%. Therefore, it conducted this research to see the phase, functional group, absorbance level, and energy band gap of CaCO3 samples. CaCO3 was synthesized using the calcination method, in which the egg shells were first soaked in sodium hypochlorite, then dried at 250°C for 10 minutes, and CaCO3 powder was obtained. Then the powder was characterized by XRD, FTIR, and UV-Vis. The results of XRD analysis showed that the calcite phase of CaCO3 was 100% according to the JCPDS PDF of calcite (96-901-6707) with a crystalline size of CaCO3 of 22.6 nm. The results of FTIR of CaCO3 samples at the absorption peak of 4000-500 cm-1 identified the functional groups of Ca-O, C-O, -CH2, and O-H. CaCO3 samples can absorb light at wavelengths of 237.1 nm, 251.5 nm, and 289.7 nm, which have an energy band gap of 3.91 eV. Thus, using this simple calcination method, the CaCO3 sample obtained from the extraction of chicken egg shells can later be applied in the medical field.
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Kumar.L, Sampath, Shantha V e Hariharan P. "CHARACTERIZATION AND ANTIMICROBIAL ACTIVITY STUDIES OF CALCITE-ZINCATE NANOPARTICLES BY GREEN SYNTHESIS". International Journal of Innovative Research in Advanced Engineering 9, n. 10 (30 ottobre 2022): 426–34. http://dx.doi.org/10.26562/ijirae.2022.v0910.03.
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Nanoparticles (Nps) are extremely useful in a extensive choice of industries, together with electronics, the environs, cosmetics, material science, and medicinal systems, among others. Calcium Carbonate (CaCO3) and Zinc Oxide (ZnO) nanomaterials have long been popular research topics. It is frequently used in dentistry applications due to its biocompatibility. The purpose of this study was to produce and describe calcium carbonate/zinc oxide nanoparticles (CaCO3/ZnO-NPs) prepared via precipitation method. The precipitation method has many advantages, including being more controllable and reproducible, as well as allowing for easy particle size control. Temperature and the calcination process both have an impact on the formation of nanoparticles. The calcination at high temperatures resulted in spherical-shaped particles, a reduction in aggregate size, and an increase in the crystalline nature of the NPs. Nitrates of calcium and zinc, sodium hydroxide were used, along with silk washed waste water containing sericin as a capping agent. CaCO3/ZnO-NPs were produced at 60°C using calcination (500°C). The antibacterial activities of the nanoparticles against gram-positive bacteria Staphylococcus aureus and Enterococcus faecalis, as well as gram-negative bacteria Escherichia coli and Klebsiella pneumoniae, also, Fungus - Candida albicans were investigated, via the disk diffusion method. CaCO3/ZnO-NPs were successfully produced and exhibited a crystalline nanostructure, confirmed the elements of CaCO3/ZnO-NPs, and revealed that the CaCO3/ZnO-NPs obtained had an irregular spherical shape. The nanoparticles were found to be void of contaminants and organic. The absorption group at nm points out the occurrence of CaCO3, and the absorption group at 380 nm confirm the existence of ZnO. In addition, these CaCO3/ZnO-NPs have improved antimicrobial activity with potential applications in dentistry.
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Zhang, Yi, Zhong Tao, Lei Wu, Zhiqi Zhang e Zhiman Zhao. "Study on Effect of Nano-CaCO3 on Properties of Phosphorus Building Gypsum". Materials 16, n. 9 (25 aprile 2023): 3354. http://dx.doi.org/10.3390/ma16093354.
Testo completoAbstract (sommario):
Phosphogypsum is an industrial by-product from the wet preparation of phosphoric acid. Phosphorus building gypsum (PBG) can be obtained from phosphogypsum after high-thermal dehydration. Improving the mechanical properties of PBG is of great significance to extending its application range. In this paper, PBG was modified by adding nano-CaCO3. Specifically, this study, conducted on 0.25–2% nano-CaCO3-doped PBG, tested effects on the fluidity, setting time, absolute dry flexural strength, absolute dry compressive strength, water absorption and softening coefficient of PBG, followed by its microscopic analysis with SEM and XRD. The experimental results showed that, with an increase in nano-CaCO3 content, the fluidity and setting time of PBG-based mixes were decreased. When the content was 2%, the fluidity was 120 mm, which was 33% lower than that of the blank group; the initial setting time was 485 s, which was 38% lower than that in the blank group; the final setting time was 1321 s, which was reduced by 29%. Nano-CaCO3 evidently improved the absolute dry flexural strength, absolute dry compressive strength, water absorption and softening coefficient of PBG to a certain extent. When the content was 1%, the strengthening effect reached the optimum, with the absolute dry flexural strength and absolute dry compressive strength being increased to 8.1 MPa and 20.5 MPa, respectively, which were 50% and 24% higher than those of the blank group; when the content was 1.5%, the water absorption was 0.22, which was 33% lower than that of the blank group; when the content approached 0.75%, the softening coefficient reached the peak of 0.63, which was 66% higher than that of the blank group. Doping with nano-CaCO3 could significantly improve the performance of PBG, which provides a new scheme for its modification.
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Addenan, Nurul Asyiqin, Mohamad Syazwan Ngalimat, Raja Noor Zaliha Raja Abd Rahman, Rakesh Donepudi, Noor Azline Mohd Nasir, Mohd Saleh Jaafar e Suriana Sabri. "Evaluation of Calcium Carbonate Precipitation by Bacillus spp. Isolated from Stingless Bee Products". Sains Malaysiana 52, n. 6 (30 giugno 2023): 1723–35. http://dx.doi.org/10.17576/jsm-2023-5206-09.
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Microbiologically Induced Calcium Carbonate Precipitation (MICCP) through urea hydrolysis is the most effective way to precipitate a high concentration of calcium carbonate (CaCO3) within a short time. The MICCP process is used to remediate the micro-crack in the concrete. However, limited research has been conducted to determine CaCO3 precipitation by bacteria, especially in Malaysia. Here, Bacillus spp. isolated from the Malaysian stingless bee products were evaluated for CaCO3 precipitation. Bacillus spp. were selected for further study according to their ability to produce urease enzymes. The urease-positive Bacillus spp. were screened for CaCO3 precipitation by culturing on both CaCO3 precipitation agar and broth media. The survivability of the urease-positive Bacillus spp. in various temperatures, pH values, and NaCl concentrations were tested. Seven out of 11 Bacillus spp. were found as ureolytic bacteria. Among the ureolytic bacteria, bacteria belonging to the Bacillus subtilis species complex group showed the highest number of bacteria (36.4%) that are capable of precipitating CaCO3. Bacillus stratosphericus PD6 and B. aryabhattai BD8 exhibited the largest CaCO3 precipitation zones (15 mm). Bacillus stratosphericus PD6 also precipitated the highest amount of CaCO3 (65 mg) and urease activity (0.197 U/mL). All the urease-positive Bacillus spp. were able to grow at 45 °C, pH (8 to 12), and 5% NaCl. Only B. subtilis BD3 can withstand high temperatures up to 55 °C and 15% NaCl concentration. In conclusion, Bacillus spp. isolated from stingless bee products showed the ability as the CaCO3 precipitating bacteria; suggesting its potential application in self-healing concrete.
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Butler, Allison. "Earthworks: Visual Artists for the Earth Group". Leonardo 20, n. 2 (1987): 205. http://dx.doi.org/10.2307/1578353.
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Nelson, Glen. "Mormon Artists Group: Adventures in Art Making". Dialogue: A Journal of Mormon Thought 39, n. 3 (1 ottobre 2006): 115–24. http://dx.doi.org/10.2307/45227285.
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Vujasinovic-Stupar, Nada, Snezana Novkovic e Ivana Jezdic. "Supplementation with bio-calcium from shells Pinctada maxima in postmenopausal women with decreased mineral bone density: Pilot study". Srpski arhiv za celokupno lekarstvo 137, n. 9-10 (2009): 518–23. http://dx.doi.org/10.2298/sarh0910518v.
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Introduction Treatment of osteoporosis, in addition to a specific antiresorptive or anabolic treatment, requires supplementation with calcium and vitamin D. Widespread cultivation of pearl shells has made pearls available for commercial use for a very reasonable price. The main chemical compound of pearls from shells Pinctada maxima is calcium-carbonate (CaCO3). Recently developed technologies applied in a micronisation process have provided increased gastrointestinal resorption of calcium, estimated at over 90% of calcium intake. Objective The paper is aimed at monitoring of efficacy and tolerance of six-month bio-calcium supplementation in postmenopausal women with reduced bone mineral density. Methods Group I (30 patients) received, three times a day, capsules of pearl powder from shells Pinctada maxima (it is equal to 260 mg of elementary calcium); group II (20 patients) received a daily dose of 500 mg inorganic CaCO3. Both groups received 666 IU of cholecalciferol per day. In all patients, bone mineral density (BMD) of the spine or hip, serum blood and urine levels of Ca, phosphates and alkaline phosphatase, were measured before and after six months of the treatment. Results Group I/Group II: average age 61.7/61.7 years; beginning of menopause: 48.32 /48 years; menopause duration 13.4/13.7 years; average body mass index 27.2/27 kg/m2 . These two groups did not different significantly before supplementation. Six-month supplementation with CaCO3 of the biological origin led to the increase of BMD from 0.901 g/cm2 to 0.948 g/cm2 (p=0.067), while BMD remained the same in the group supplemented with inorganic CaCO3. Gastrointestinal tolerability of bio-calcium was excellent, without any adverse events. Conclusion These data could not strongly support the hypothesis of better efficacy of bio-calcium taking into account a small number of patients and a short follow-up period in this pilot study. Tolerance of CaCO3 of the biological origin was excellent and free of any adverse events. The results of laboratory values were within normal range.
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Khan, Waqas-ud-Din, Rabia Shaukat, Muhammad Ansar Farooq, Muhammad Nadeem Ashraf, Faisal Nadeem, Mohsin Tanveer, Yasir Hamid e Nan Sun. "Iron-Doped Biochar Regulated Soil Nickel Adsorption, Wheat Growth, Its Physiology and Elemental Concentration under Contrasting Abiotic Stresses". Sustainability 14, n. 13 (28 giugno 2022): 7852. http://dx.doi.org/10.3390/su14137852.
Testo completoAbstract (sommario):
The prevalence of abiotic stresses hampers soil health and plant growth in most ecosystems. In this study, rice husk iron-enriched biochar (BC) was prepared and its superiority in terms of nutrients enrichment, porosity and different acidic functional group (O-H, C=O) relative to simple biochar was confirmed through scanning electron microscopic, X-ray fluorescence and Fourier transform infrared analysis. To further evaluate its nickel (Ni), salt (NaCl) and carbonate (CaCO3) stress mitigating impact on wheat physiology and biochemical attributes, a pot experiment was conducted using; BC (1%), Ni (0.5 mM NiNO3), Na (100 mM NaCl) and CO3 (100 mM CaCO3) and with twelve treatments; T1; Control, T2; NiNO3, T3; CaCO3, T4; NaCl, T5; BC, T6; Ni + BC, T7; CaCO3 + BC, T8; NaCl + BC, T9; Ni + CaCO3 + BC, T10; Ni + NaCl + BC, T11; CaCO3 + NaCl + BC, T12; Ni + NaCl + CaCO3 + BC. The Langmuir isotherm model revealed the maximum Ni adsorption capacity (2433 mg g−1) in treatments where Ni was applied with BC soil. Maximum soil DTPA-extractable Ni was found in the T9 treatment; however, Ni concentration was not reported in wheat roots while only trace amounts of Ni were found in wheat shoots with the T9 treatment. It was suggested that BC has the capacity to induce the immunization effect in plant roots by providing additional Fe so their ionic homeostasis and redox metabolism worked properly. This argument was further paved by the enhanced adsorption of these toxic ions in the presence of BC-favored wheat growth as indicated by maximum increases in shoot iron and potassium concentrations under Ni + CaCO3 + BC, relative to control. Furthermore, the decrease in shoot hydrogen peroxide (H2O2) (20%) and malondialdehyde (32%) concentrations and increase in shoot ascorbate peroxidase (81%) and catalase (three-fold) activities under Ni + BC relative to Ni + NaCl + CaCO3 + BC controlled the cell membrane damage. In conclusion, BC proved to be an excellent amendment to reduce the toxic effects of Ni, NaCl and CaCO3 stresses and enhance wheat growth and nutrition.
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Ferreira, Meire Coelho, Maria Letícia Ramos-Jorge, Alberto Carlos Botazzo Delbem e Ricardo de Sousa Vieirac. "Effect of Toothpastes with Different Abrasives on Eroded Human Enamel: An in situ/ex vivo Study". Open Dentistry Journal 7, n. 1 (30 settembre 2013): 132–39. http://dx.doi.org/10.2174/1874210601307010132.
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The aim of the present study was to investigate the abrasive effect of CaCO3 and SiO2-based fluoride-free experimental toothpastes on eroded human permanent dental enamel and evaluate the effectiveness of waiting periods between acid exposure and tooth brushing. Twelve volunteers wore palatal appliances containing human enamel blocks for two periods of five days each. The appliances were immersed in a soft drink for five minutes four times a day (9:00 am, 11:00 am, 2:00 pm and 4:00 pm). On two occasions, two blocks were not submitted to additional treatment; two blocks were brushed (30 s) either with a CaCO3 or SiO2 toothpaste immediately after erosion and two blocks were brushed 1 h after erosion. Thus, the sample was divided into six groups: erosion alone (CaCO3 and SiO2 control); brushing with fluoride-free toothpaste (CaCO3 immediate and 1 h after erosion; SiO2 immediate and 1 h after erosion). Significant differences in wear depth were found between the enamel blocks in the CaCO3 immediate and 1 h after erosion groups and the blocks in the CaCO3 control group (p=0.001; p=0.022). No significant differences were found regarding the change in roughness and wear depth between blocks submitted to immediate abrasion and 1 h after erosion (CaCO3 and SiO2). The data revealed that surface roughness and wear depth is increased when erosion is combined with dental abrasion, regardless of the abrasive used. Waiting for 1 h to brush the eroded blocks offered no protective effect.
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Zaynutdinova, Zukhra. "ACTIVITY OF THE GROUP OF ARTISTS "5 + 1" IN CONCEPTUAL ART". CURRENT RESEARCH JOURNAL OF HISTORY 02, n. 12 (1 dicembre 2021): 6–12. http://dx.doi.org/10.37547/history-crjh-02-12-02.
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The article examines the role and significance of the "5 + 1" group in the development of contemporary art in Uzbekistan in the context of the creativity of the group's artists. The ideas and aesthetics of paintings, installations, video art in the work of individual artists are revealed in detail.
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Bwatanglang, Ibrahim Birma, Samuel T. Magili e Iliya Kaigamma. "Adsorption of phenol over bio-based silica/calcium carbonate (CS-SiO2/CaCO3) nanocomposite synthesized from waste eggshells and rice husks". PeerJ Physical Chemistry 3 (2 marzo 2021): e17. http://dx.doi.org/10.7717/peerj-pchem.17.
Testo completoAbstract (sommario):
A bio-based Silica/Calcium Carbonate (CS–SiO2/CaCO3) nanocomposite was synthesized in this study using waste eggshells (ES) and rice husks (RH). The adsorbents (ESCaCO3, RHSiO2 and, CS-SiO2/CaCO3) characterized using XRD show crystallinity associated with the calcite and quartz phase. The FTIR of ESCaCO3 shows the CO−23 group of CaCO3, while the spectra of RHSiO2 majorly show the siloxane bonds (Si–O–Si) in addition to the asymmetric and symmetric bending mode of SiO2. The spectra for Chitosan (CS) show peaks corresponding to the C=O vibration mode of amides, C–N stretching, and C–O stretching. The CS–SiO2/CaCO3 nanocomposite shows the spectra pattern associated with ESCaCO3 and RHSiO2. The FESEM micrograph shows a near monodispersed and spherical CS–SiO2/CaCO3 nanocomposite morphology, with an average size distribution of 32.15 ± 6.20 nm. The corresponding EDX showed the representative peaks for Ca, C, Si, and O. The highest removal efficiency of phenol over the adsorbents was observed over CS–SiO2/CaCO3 nanocomposite compared to other adsorbents. Adsorbing 84–89% of phenol in 60–90 min at a pH of 5.4, and a dose of 0.15 g in 20 ml of 25 mg/L phenol concentration. The result of the kinetic model shows the adsorption processes to be best described by pseudo-second-order. The highest correlation coefficient (R2) of 0.99 was observed in CS-SiO2/CaCO3 nanocomposite, followed by RHSiO2 and ESCaCO3. The result shows the equilibrium data for all the adsorbents fitting well to the Langmuir isotherm model, and follow the trend CS-SiO2/CaCO3 > ESCaCO3 > RHSiO2. The Langmuir equation and Freundlich model in this study show a higher correlation coefficient (R2 = 0.9912 and 0.9905) for phenol adsorption onto the CS–SiO2/CaCO3 nanocomposite with a maximum adsorption capacity (qm ) of 14.06 mg/g compared to RHSiO2 (10.64 mg/g) and ESCaCO3 (10.33 mg/g). The results suggest good monolayer coverage on the adsorbent’s surface (Langmuir) and heterogeneous surfaces with available binding sites (Freundlich).
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Lew, Jin Hau, Paul F. Luckham, Omar K. Matar, Erich A. Müller, Adrielle Sousa Santos e Myo Thant Maung Maung. "Consolidation of Calcium Carbonate Using Polyacrylamides with Different Chemistries". Powders 3, n. 1 (21 dicembre 2023): 1–16. http://dx.doi.org/10.3390/powders3010001.
Testo completoAbstract (sommario):
In this work, the consolidation of calcium carbonate (CaCO3) by polyacrylamide (PAM) of different molecular weights, charge densities, and functional groups was investigated via oscillatory rheology and unconfined compressive strength (UCS) analysis. Oscillatory rheology showed that the storage modulus G′ was approximately 10 times higher than the loss modulus G″, indicating a highly elastic CaCO3 sample upon consolidation via PAM. Both oscillatory rheology and UCS analysis exhibited similar trends, wherein the mechanical values (G′, G″, and UCS) first increased with increasing polymer dosage, until they reached a peak value (typically at 3 mgpol/gCaCO3), followed by a decrease in the mechanical values. This indicates that there is an optimum polymer dosage for the different PAM-CaCO3 colloidal systems, and that exceeding this value induces the re-stabilisation of the colloidal system, leading to a decreased degree of consolidation. Regarding the effect of the PAM molecular weight, the peak G’ and UCS values of CaCO3 consolidated by hydrolysed PAM (HPAM) of different molecular weights are very similar. This is likely due to the contour length of the HPAMs being either almost the same or longer than the average distance between two CaCO3 particles. The effect of the PAM charge density revealed that the peak G′ and UCS values decreased as the charge density of the PAM increased, while the optimum PAM dosage increased with decreasing PAM charge density. The higher likelihood of lower-charge PAM bridging between the particles contributes to higher elastic energy and mechanical strength. Finally, regarding the PAM functional group, CaCO3 consolidated by sulfonated polyacrylamide (SPAM) typically offers lower mechanical strength than that consolidated with HPAM. The bulky sulfonate side groups of SPAM interfere with the surface packing, reducing the number of polymers able to adsorb onto the surface and, eventually, reducing the degree of consolidation of CaCO3. The zeta potential of the PAM-CaCO3 samples became more negative with increasing PAM concentration due to the saturation of the particle surface. Good agreement between oscillatory rheology and UCS analysis could accelerate PAM screening for optimum CaCO3 consolidation.
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Oettinger, C. W., J. C. Oliver e E. J. Macon. "The effects of calcium carbonate as the sole phosphate binder in combination with low calcium dialysate and calcitriol therapy in chronic hemodialysis patients." Journal of the American Society of Nephrology 3, n. 4 (ottobre 1992): 995–1001. http://dx.doi.org/10.1681/asn.v34995.
Testo completoAbstract (sommario):
Alternative phosphate binders, such as CaCO3, have been shown to be effective in the control of phosphate (P) retention in hemodialysis patients (HDP). Additionally, both oral (POC) and iv (IVC) calcitriol are purported to be of benefit in the control of secondary hyperparathyroidism. This investigation was undertaken to determine: (1) the effectiveness of CaCO3 as the sole P binder in combination with low (2.5 mEq/L) Ca dialysate; (2) the effects of discontinuing Al(OH)3 binders on both unstimulated and stimulated Al concentrations; and (3) the comparative parathyroid hormone (PTH) response to both POC and IVC in a large group of hemodialysis patients. One hundred ninety-four HDP completed part 1 of the study where CaCO3 was substituted for Al(OH)3 as the sole P binder for 6 months. A cohort of 49 HDP was given desferoximine (40 mg/kg) initially and 10 months after using CaCO3. In part 2, 54 HDP were given POC and 97 HDP were given IVC in dosages of 0.25 to 0.5 micrograms/day and 1.5 to 6.0 micrograms/wk, respectively, for an additional 6 months. In part 1, Ca and P were not different from baseline values observed with Al(OH)3 therapy. Ionized Ca increased (P < 0.05) and PTH decreased (P < 0.001) during CaCO3 therapy without vitamin D. In part 2, PTH declined 23% with IVC and was unchanged with POC in equivalent dosages (P < 0.05) at 3 months. By 6 months, PTH declined a total of 54% with IVC and was unchanged with POC. Ca, ionized Ca, P, and serum calcitriol were greater (P < 0.05) in the IVC group at 6 months. Serum Al concentrations for the entire 194 HDP fell 65% (P < 0.0001) over 12 months. In the 49 HDP cohort, serum Al fell 43.6% (P < 0.001) and stimulated Al concentrations decreased 68.7% (P < 0.0001) after 10 months. We conclude that: (1) CaCO3 is as effective as Al(OH)3 in controlling P, (2) a small decrease in PTH is observed with CaCO3 alone, (3) serologic evidence of Al excess is virtually eliminated, (4) PTH suppression with IVC is superior to that seen with POC in equivalent doses.
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Russell, Will G., e Michelle Hegmon. "Identifying Mimbres Artists". Advances in Archaeological Practice 3, n. 4 (novembre 2015): 358–77. http://dx.doi.org/10.7183/2326-3768.3.4.358.
Testo completoAbstract (sommario):
AbstractPast researchers have identified individual styles of painting in Mimbres Black-on-white bowls, leading Steven LeBlanc to recently call for the development of quantitative methods to enable and assess such identifications. We propose such a methodology here. Through a process of pair-wise, micro-stylistic comparisons, bowls painted by a single artist or group of closely cooperating artists are analytically linked in chain-like fashion. Two bowls are attributed to the “same hands” if their similarity measure is at or above 70 percent. Similarity measures are determined by comparing minute details that reflect artistic decisions. The method takes into account diachronic development of artistic skill, subject matter diversity, and the transfer of style across generations. Results can contribute to an understanding of stylistic development, craft specialization, and the role of artists in traditional societies.
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Rapisarda, Marco, Maria Chiara Mistretta, Michelangelo Scopelliti, Melania Leanza, Francesco Paolo La Mantia e Paola Rizzarelli. "Influence of Calcium Carbonate Nanoparticles on the Soil Burial Degradation of Polybutyleneadipate-Co-Butylenetherephthalate Films". Nanomaterials 12, n. 13 (1 luglio 2022): 2275. http://dx.doi.org/10.3390/nano12132275.
Testo completoAbstract (sommario):
A polybutyleneadipate-co-butylenetherephthalate (PBAT) sample, commercially known as Ecoflex®, was processed via melt extrusion with CaCO3 nanoparticles coated with a hydrophobic coating. Blown films of PBAT and two composites with nanofiller (2% and 5%wt) were prepared and degradation tests in soil at 30 °C up to 180 days were carried out with weight loss measurements. Furthermore, biodegradation test according to ISO 14851 was carried out at 30 °C. The effect of CaCO3 on soil burial degradation was assessed by surface wettability and SEM. ATR-FTIR and XPS analyses highlighted chemical modifications induced by soil degradation. CaCO3 nanoparticles decreased surface wettability and discouraged the disintegration in soil. Interestingly, SEM images after soil degradation highlighted in the nanocomposite films selective zones of disintegration. XPS showed an increasing peak area C 1s ratio of C–O to C=O with degradation time. Moreover, after the soil burial test, carbonyl index determined by ATR-FTIR increased in both nanocomposites. In fact, the addition of CaCO3 leads to a rise in the carbonyl zone due to the presence of the carbonate group. Remarkably, FTIR data after soil degradation showed an enrichment of the aromatic content, a preferential cleavage and erosion of the aliphatic moiety in PBAT films, amplified by the presence of the CaCO3 nanofiller.
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Aboelyazeed, Hossam, Sahar El-haggar e Kamal Okasha. "COMPARATIVE STUDY BETWEEN THE EFFECT OF HISTAMINE RECEPTOR ANTAGONISTS OF TYPE II (FAMOTIDINE) AND PROTON PUMP INHIBITORS (OMEPRAZOLE) ON THE EFFICACY OF CALCIUM CARBONATE AS PHOSPHATE BINDER IN HAEMODIALYSIS PATIENT". International Journal of Pharmacy and Pharmaceutical Sciences 9, n. 8 (1 agosto 2017): 10. http://dx.doi.org/10.22159/ijpps.2017v9i8.12072.
Testo completoAbstract (sommario):
Objective: The purpose of this study was to compare the effect of famotidine versus omeprazole on the efficacy of calcium carbonate as a phosphate binder in the hemodialysis patient.Methods: From February 2014 to June 2014 a total number of 64 patients of both sexes were recruited from the department of renal dialysis, Tanta University Hospital, Egypt. Patients categorized into 3 groups. Group I (control group) consisted of 20 Patients (10) females and (10) males take calcium carbonate (caco3) (2.5–4 g/d) only, Group II consisted of 21 Patients (13) females and (8) males take the same dose of caco3 with famotidine 10 mg/d and Group III consisted of 23 Patients (8) females and (15) male take the same dose caco3 with omeprazole 20 mg/d.Results: All data are expressed as the mean±SD. Group II showed a significant increase (p<0.05) in serum phosphorus at 3rd mo with significant decreased (p<0.05) in serum calcium comparing with pre-treatment. Group III showed no significant change (p>0.05) in serum calcium, phosphorus and parathyroid hormone (PTH) comparing with pre-treatment. Both groups (II and III) showed a significant decrease in alkaline phosphatase (ALP) (p<0.05).Conclusion: Co-administration of famotidine with calcium carbonate aggravates hyperphosphatemia and this may increase the incidence of complications. The efficacy of calcium carbonate as a phosphate binder was not affected by co-administration of omeprazole.
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Feser, Frauke. "The visiting artist researcher experiment". Journal of Science Communication 14, n. 01 (31 marzo 2015): C02. http://dx.doi.org/10.22323/2.14010302.
Testo completoAbstract (sommario):
The visiting artist researcher experiment discussed here brought together visual artists and climate scientists, amongst them my research group which studies storms. The artists’ stay led to a dialogue between our diverging perspectives and an open exchange of ideas. The exchange in my research group was more interactive than I had expected. Many conversations provided insights into ideas and work flows of the artists and, eventually, a new view on our storm studies.
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Jang, S. O., Su Young Lee, Hae Sun Kim, W. G. Chung, Kyoung Nam Kim, Kwang Mahn Kim e B. I. Kim. "Abrasivity of Desensitizing Dentifrice Containing Sodium Metasilicate". Key Engineering Materials 330-332 (febbraio 2007): 1397–400. http://dx.doi.org/10.4028/www.scientific.net/kem.330-332.1397.
Testo completoAbstract (sommario):
This in vitro study compared the abrasivity of commercial desensitizing dentifrices with a sodium metasilicate (Na2SiO3) dentifrice using a Surface Profile Method. Dentin specimens were made from the root of extracted human molars. The cervical part of the teeth was sectioned with a diamond wheel disk. The teeth were embedded into an epoxy resin mold and the surface was gradually polished by silicone carbide paper. After grinding, the degree of surface roughness was tested within the range of 2 mm with tapping. The British Standard Institution reference dentifrice (BSI: CaCO3 40%) and experimental dentifrices (group 1: Na2SiO3 25%, CaCO3 10% and SiO2 10%, group 2: CaCO3 10% and SiO2 10%, group 3: CaCO3 10% and SrCl2 10%, group 4: Colloidal Silica 2-3% and Hydroxyapatite 10-20%) were evaluated. The dentifrice slurries were prepared by mixing 24 grams of the dentifrice in 12 ml distilled water. Each tooth specimen was brushed with the dentifrice slurries 1,000 times. The relative abrasivity of each dentifrice was evaluated from the ratio of the BSI standard dentifrice to each experiment. The results were analyzed by one-way ANOVA and Tukey’s multiple comparisons using Window SPSS (Statistical analysis system) 12.0. Groups 1 (71), 2 (74.2), 3 (38) and 4 (7.8) showed a lower abrasivity than the BSI dentifrice (100) (p<0.05). The relative abrasivity of groups 3 (38) and 4 (7.8) was the lowest compared with the BSI dentifrice (100). However, group 1 (71) containing Na2SiO3 showed a similar abrasivity to group 2 (74.2), which did not contain Na2SiO3 (p>0.05). Therefore, Na2SiO3 had no influence on the abrasivity of the dentifrice. In conclusion, the dentifrice containing Na2SiO3 had a lower abrasivity than the BSI reference dentifrice, but showed a significantly higher abrasivity than the existing commercial desensitizing dentifrices. Overall, the relatively high abrasivity of Na2SiO3 dentifrice is believed to be the result of other components in the abrasive system.
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Taewana, Thitiyada, e Rewadee Wongmaneerung. "Synthesis Hydroxyapatite from Three Types Eggsshells by Co-Precipitation Method". Applied Mechanics and Materials 866 (giugno 2017): 73–76. http://dx.doi.org/10.4028/www.scientific.net/amm.866.73.
Testo completoAbstract (sommario):
In the present work, hydroxyapatite (HAp) were synthesised from three types eggshells (hen eggshells, duck eggsshells and quail eggsshells) by co-precipitation method. By using recycled eggshells, there were calcined at 700-900 °C for 2 h to form calcium carbonate (CaCO3). Then, CaCO3 and ammonium dihydrogenphosphate (NH4H2PO4) were used as precursor to produce HAp. The molar ratio of Ca to P was 1.67 : 1. In order to determine the most suitable calcination temperature to produce HAp based on purity of CaCO3, HAp were investigated over the temperatures range of 800-1100 °C for 2 h. Phase formation and microstructure evolution of HAp samples were determined by using (XRD), (SEM) and (FTIR) respectively. The results showed that CaCO3 formed at 700 °C for 2 h of all eggshell types. XRD investigations show that HAp powder were stable up to 1100 °C with hexagonal structure. SEMinvestigations demonstrate that the HAp powder obtained with a sphere morphology and FTIR confirmed that the HAp powder calcined at 1100 °C corresponded to the phosphate group in PO43- with significant characteristic peaks at 1026.5 and 563.9 cm-1.
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Hanrahan, Stephanie J. "Sport Psychology and Indigenous Performing Artists". Sport Psychologist 18, n. 1 (marzo 2004): 60–74. http://dx.doi.org/10.1123/tsp.18.1.60.
Testo completoAbstract (sommario):
A group of students from the Aboriginal Centre for the Performing Arts participated in a mental skills training program that focused on goal setting, self-confidence development, and team building. There were 13 two-hour sessions held over a 20-week period. The participants, cultural issues, and the basic structure of the program are described. The author’s observations regarding competition, displays of affection, collective values, and the importance of family and nature are provided. The participants qualitatively evaluated the program. Conclusions related to group process, program structure, and diversity are presented. These conclusions should be of value in terms of shaping future group mental skills training programs.
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Lake, Susan. "The Challenge of Preserving Modern Art: A Technical Investigation of Paints Used in Selected Works by Willem de Kooning and Jackson Pollock". MRS Bulletin 26, n. 1 (gennaio 2001): 56–60. http://dx.doi.org/10.1557/mrs2001.20.
Testo completoAbstract (sommario):
Willem de Kooning (1904–1997) and Jackson Pollock (1912–1956) are perhaps the best-known members of the abstract expressionist movement, a group of diverse artists from disparate backgrounds who radically transformed American art during the 1940s and into the 1950s. While the development and legacy of abstract expressionism remains a subject of considerable debate, what this diverse group of artists had in common was the belief that the materials, and the ways the artists applied them, are crucial to the expression of their art.
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Vašíčková, Kateřina, Andrea Mikotová e Lucie Šilerová. "Stress in Music Managers and Artists: Pilot study on Czech and Slovak Students". Zeitschrift für Kulturmanagement 4, n. 1 (1 maggio 2018): 133–44. http://dx.doi.org/10.14361/zkmm-2018-0108.
Testo completoAbstract (sommario):
AbstractThe aim of the presented study was to do a pilot research on the comparison of the incidence of stress in a group of students of music management and art of music. We examined whether artists and music managers differ in the perception of the intensity of stress when playing (working) solo from the intensity when playing (working) in group. Furthermore, we focused on the most common stressors and main stress symptoms among music managers and artists. Total 63 students of music, cultural or art management (average age 28.6 years; 69.8 % were women) and 75 students of art of music (average age 26.7 years; 64 % were women) filled out an online questionnaire in the spring of 2016. The results show that while artists reported higher stress levels when playing solo, music managers reported higher stress levels when working in a group. A closer look showed that while only a few music managers (4,8 %) are intensely stressed when working in a team, a considerable group of artists (26 %) stated that they were most stressed out when playing solo. As their main work stressors artists mentioned blackouts, unpreparedness, and audience, music managers listed flaws in the human factor, time pressure and financial problems. Stress symptoms among artists are mainly physiological and short-term but at the same time intensive, while stress symptoms among music managers are rather long-term and related to psyche, and relationships with others.
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Winestein, Anna. "Artists at Play". Experiment 25, n. 1 (30 settembre 2019): 328–45. http://dx.doi.org/10.1163/2211730x-12341346.
Testo completoAbstract (sommario):
Abstract The exhibition of Russian folk art at the Paris “Salon d’Automne” of 1913 has been generally overlooked in scholarship on folk art, overshadowed by the “All-Russian Kustar Exhibitions” and the Moscow avant-garde gallery shows of the same year. This article examines the contributions of its curator, Natalia Erenburg, and the project’s instigator, Iakov Tugendkhold, who wrote the catalogue essay and headed the committee—both of whom were artists who became critics, historians, and collectors. The article elucidates the show’s rationale and selection of exhibits, the critical response to it and its legacy. It also discusses the artistic circles of Russian Paris in which the project originated, particularly the Académie russe. Finally, it examines the project in the context of earlier efforts to present Russian folk art in Paris, and shows how it—and Russian folk art as a source and object of collecting and display—brought together artists, collectors, and scholars from the ranks of the Mir iskusstva [World of Art] group, as well as the younger avant-gardists, and allowed them to engage Parisian and European audiences with their own ideas and artworks.
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Saraswati, Widya, Devi Eka Juniarti, Vita Lestari, Adioro Soetojo, Sri Kunarti, Febriastuti Cahyani, Ketut Suardita e Nabiela Rahardia. "Differences of compressive strength between calcium carbonate from blood clam shells and calcium hydroxide as a candidate for pulp capping material". Conservative Dentistry Journal 14, n. 1 (24 luglio 2024): 11–14. http://dx.doi.org/10.20473/cdj.v14i1.2024.11-14.
Testo completoAbstract (sommario):
Background: Pulp capping is one of the treatments for reversible pulpitis and aims to maintain pulp vitality. This treatment requires a material that can protect the pulp with good biocompatibility. The physical and mechanical properties, bio interactivity and bioactivity of pulp capping materials are very important for the formation of reparative dentin. Calcium hydroxide (Ca(OH)2) as the gold standard material in pulp capping treatment also has some disadvantages. Another alternative for pulp capping material is blood clam shell because it contains 98% calcium carbonate (CaCO3), which is a compound with a bone-like structure and can induce pulp cell differentiation. Objective: To investigate and explain the difference in compressive strength between CaCO3 from blood clam shells and Ca(OH)2 as a candidate pulp capping material. Methods: This research is a laboratory experimental study with post test only control group design method. Ca(OH)2 and CaCO3 samples were formed with a mixture of powder and aquadest with 4x6 mm sample size. The samples were dried at room temperature and the compressive strength was measured using a universal testing machine (UTM). Result: There is a significant difference in compressive strength between Ca(OH)2 and CaCO3 blood clam shells in the Mann-Whitney test results (p<0.05). Conclusion: The results of the compressive strength test between the mixture of Ca(OH)2 with aquadest in a ratio of 1:1 are greater than the mixture of CaCO3 blood clam shells with aquadest in a ratio of 3:1 so that pure CaCO3 blood clam shells with distilled water without other additives cannot be used as a candidate for capping pulp material.
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Stack. "Gender and Suicide Risk Among Artists: A Multivariate Analysis". Suicide and Life-Threatening Behavior 26, n. 4 (dicembre 1996): 374–79. http://dx.doi.org/10.1111/j.1943-278x.1996.tb00841.x.
Testo completoAbstract (sommario):
Research on mental disorders among male artists has suggested that artists are at risk of suicide. However, given that men are higher in suicide risk than women, the presumed suicide risk of artists may be an artifact of sampling bias. A logistic regression analysis of data from 21 states finds that artists have a 270% higher risk of suicide than nonartists. However, after controlling for gender and sociodemographic variables, this risk level is reduced to 125%. The findings are related to both psychiatric and work‐related stress factors that may place artists at risk of suicide as an occupational group.
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Głaz, Stanisław. "Relationship of Personality Traits and Hope With Job Satisfaction in the Life of Polish Artists and Pedagogues". Journal for Perspectives of Economic Political and Social Integration 28, n. 2 (25 gennaio 2023): 89–120. http://dx.doi.org/10.18290/pepsi-2022-0009.
Testo completoAbstract (sommario):
The purpose of this paper was to show the relationship between personality traits and hope, as well as the job satisfaction in the lives of artists and pedagogues (teachers). The research was conducted among artists and pedagogues living and working in Poland. Research tools such as: Job Satisfaction (SSP) by Zalewska, Personality Inventory (NEO-FFI) by Costa and McCrae, and the Hope Scale (HS) by Snyder were used. The obtained results show that extraversion correlates significantly and positively with job satisfaction, while neuroticism – negatively – in the group of pedagogues. Agency correlates significantly and positively with job satisfaction in the group artists and pedagogues. Result of multiple regression analysis reveals that agency and pathways have a statistically significant and positive relationship with job satisfaction in the group of artists and pedagogues. Extraversion and neuroticism have a statistically significant relationship with job satisfaction in the group of pedagogues. Extraversion has a positive relationship with job satisfaction and neuroticism negative. In addition, extraversion and neuroticism have a significant impact on job satisfaction in the group of pedagogues, where the function of the mediator is fulfilled by hope.
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Tankersley, Kenneth Barnett, Isabel Hassett, Elaine Platt, Audrey Laiveling e Emma Bradford. "The impact of soil salinity on maize agriculture: An experimental archaeology approach". North American Archaeologist 40, n. 1 (gennaio 2019): 36–48. http://dx.doi.org/10.1177/0197693119840086.
Testo completoAbstract (sommario):
This article uses experimental archaeology to provide empirical data on the impact of soil salinization on ancient maize agriculture. Hopi blue maize was experimentally grown in a drought-prone soil containing an extremely high level (50%) of evaporite mineral salts (CaCO3, CaSO4, and NaCl) in order to evaluate their effect on agricultural productivity. A control group of plants was grown in the absence of mineral salts. All of plants, which were companion planted with beans and squash, were adversely impacted by evaporite mineral salts. Maize grown alone in CaCO3−, CaSO4−, and NaCl-enriched soil exceeded the height of the control plants because the mineral salts acted as a fertilizer. Plants grown in NaCl-enriched soil produced cobbs that were reduced in size and kernel number. These findings suggest that CaCO3 and CaSO4, the most common evaporite mineral salts found in soil, would not have adversely impacted Ancestral Puebloan maize agriculture.
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Moss, Anne Eakin, Niloofar Haeri e Narges Bajoghli. "Legacies of Protest Art in Iran". Public Culture 36, n. 2 (1 maggio 2024): 153–79. http://dx.doi.org/10.1215/08992363-11158958.
Testo completoAbstract (sommario):
Abstract This article examines the art practice of a group of professors and students—who later came to be known as Group 57—at the Fine Arts College of the University of Tehran during the revolutionary period of 1978 to 1980. Through interviews with artists and art historical research, the authors describe the artists’ workshop where they produced posters against the Shah, the United States, and imperialism. Their posters drew on the bold colors, clear text, symbolic imagery, and easy reproducibility of international radical poster art and the early Russian revolutionary avant-garde. The authors recover these aesthetic and intellectual connections in the academic and professional training of the artists and in the art historical context of the posters themselves, examining the posters’ recent and more distant influences, and reinscribing the artists in the history of Iranian art and international art history. The authors also point toward connections between Group 57 and protest art in Iran today.
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Ardelt, Monika, e Lucinda Orwoll. "DOES AGE AFFECT CREATIVE PROCESS AND STYLE? A COMPARISON OF OLDER AND YOUNGER VISUAL ARTISTS". Innovation in Aging 3, Supplement_1 (novembre 2019): S417—S418. http://dx.doi.org/10.1093/geroni/igz038.1558.
Testo completoAbstract (sommario):
Abstract This study investigated differences in the creative process and style between 85 older (age 60-89 years, M=72.39) and 63 younger (age 27-58 years, M=41.95) visual artists who were nominated as artistically creative exemplars. Answers to open-ended survey questions were coded and compared by age group. Results of t-tests showed that the described creative process and style were similar for older and younger artists, with many being inspired by their environment or ideas and engaging in an intuitive and visual style. However, younger artists were more likely than older artists to be inspired by ideas, words, life, and the work process and to use an intuitive, expressionistic, eclectic, spiritual, and textured style. Interestingly, younger artists were more likely to believe that older artists have greater artistic experience, maturity, willingness to take risks, and understanding of the art world, whereas older artists tended to think that young artists are more original.
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Ilyasova, R. I. "Artistic Design in Soviet Tatarstan on the Example of “Group No. 17”". Art & Culture Studies, n. 1 (marzo 2024): 326–49. http://dx.doi.org/10.51678/2226-0072-2024-1-326-349.
Testo completoAbstract (sommario):
The article is devoted to a little-studied page of the late Soviet art of Tatarstan: the activity of design artists of the 1970s-1990s — “Group No. 17” (E. Golubtsov, V. Nesterenko, A. Leukhin, O. Boyko, R. Safiullin, V. Vyaznikov, and A. Yakupov), whose works represented the characteristic features of the technical aesthetics of the Senezh studio. The purpose of the article is to identify the context and facts related to the creative activity of the participants of this association, outline their range of interests, and study their projects. The first part of the article analyses the activities of the Senezh studio and its influence on the formation of young artists, those of Tatarstan in particular. The second part of the article presents the history of the emergence of the “Group No. 17” creative association in Kazan, its composition, forms and principles of operation. The third part of the article is devoted to the creative heritage of the design artists. For the first time, an attempt is made to generalize and systematize both realized and unrealized projects of the association, some of which are characterized. The author of the article investigates the main approaches and the nature of the Tatarstan design artists’ creative activity and highlights the originality and value of the group’s design projects, which brought the world-class high aesthetics to the masses.
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Ittu, Gudrun-Liane. "Siebenbürgisch-deutsche Künstlerinnen vom Ende des 19. und Anfang des 20. Jahrhunderts". Studia Universitatis Babeș-Bolyai Historia Artium 65, n. 1 (31 dicembre 2020): 127–55. http://dx.doi.org/10.24193/subbhistart.2020.07.
Testo completoAbstract (sommario):
"Transylvanian German women artists from the end of the 19th and beginning of the 20th century. The paper is aiming at analyzing the life and art of a group of six German women artists from Transylvania, the first ones who studied abroad, real forerunners for the next generation of female plastic artists. Emancipated ladies, determined to become artists and earn their own money, the gifted women studied in Budapest, Vienna, Munich or Paris. Only Molly Marlin did not come back home, while the others had a prodigious artistic and pedagogical activity, being present at the annual exhibitions, together with well-known male colleagues. Keywords: art academies, women artists, painters, graphic artists, art teachers, exhibitions, Sibiu, Betty Schuller, Hermine Hufnagel, Molly Marlin Horn, Anna Dörschlag, Lotte Goldschmidt, Mathilde Berner Roth "
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Styrna, Natasza. "Malarki, rzeźbiarki i graficzki z krakowskiego Zrzeszenia Żydowskich Artystów (1931–1939)". Studia Judaica, n. 2 (48) (2021): 407–35. http://dx.doi.org/10.4467/24500100stj.21.017.15072.
Testo completoAbstract (sommario):
Painters, Sculptors and Graphic Female Artists From the Kraków Association of Jewish Artists, 1931–1939 Eleven women belonged to the Kraków Association of Jewish Artists, active in the 1930s. They dealt with painting, graphic art and sculpture. Unfortunately, not much has survived from their achievements. One of the most interesting artistic personalities in this group was Henryka Kernerówna, educated in Vienna. From 1918 on, female artists younger than her could benefit from studies at the Academy of Fine Arts in Kraków. In the reviews of the exhibitions of the Association, the gender of artists was rarely mentioned, except in some cases. The artists also belonged to other non-Jewish art groups. Most of them survived the war, but none of them remained in Kraków. Three of them were killed.
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Jee, Sangbaum, e Sungah Ahn. "Analysis of Social Network and Performance of High-Income Artists". Korean Society of Culture and Convergence 45, n. 7 (31 luglio 2023): 299–310. http://dx.doi.org/10.33645/cnc.2023.07.45.07.299.
Testo completoAbstract (sommario):
This study is the first research to derive a social network activity index based on the career factors of the top 50 artists and analyze its relationship with transaction performance. The analysis results indicate that personal network centrality among artists has the most significant impact on transaction performance, followed by the importance of group network centrality. Additionally, the study categorizes artists into three clusters based on their careers: major and awards, education and number of solo exhibitions, and whether they studied abroad and social experience. These clusters demonstrate differences in transaction performance and social network characteristics. This study validates the importance of social networks that influence the transaction performance of visual artists, particularly by examining the network characteristics more closely by distinguishing between individual networks among artists and organization networks involving artists.
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Nugroho, Pringgodigdo, Maruhum B. H. Marbun, Bella Yunita, Cindy Astrella, Chairina A. Noor e Aida Lydia. "The Effectiveness and Safety of Calcium Carbonate Use in Chronic Kidney Disease Patients with Normophosphatemia". Open Urology & Nephrology Journal 14, n. 1 (23 dicembre 2021): 13–19. http://dx.doi.org/10.2174/1874303x02114010013.
Testo completoAbstract (sommario):
Background: Patients with early and moderate stages of chronic kidney disease (CKD) have normal serum phosphate levels. Increased fibroblast growth factor-23 (FGF23) levels in these patients are responsible for maintaining normophosphatemia status by increasing the excretion of phosphate through urine. However, an increased serum FGF23 level is related to cardiomegaly, vascular calcification, CKD progression, and mortality. This study aimed to examine the effectiveness and safety of calcium carbonate use in stage 3 or 4 CKD patients with normophosphatemia. Methods: This double-blind randomized controlled trial (ClinicalTrials.gov identifier NCT03550534) included stage 3 or 4 CKD patients with normophosphatemia who visited the nephrology or endocrinology clinic at Dr. Cipto Mangunkusumo Hospital. Forty-six subjects were randomized to receive either calcium carbonate or placebo over a 12-weeks period. Urine phosphate, serum phosphate, serum calcium, and serum intact FGF23 levels were measured before and after the intervention. Results: The baseline characteristics of the two groups were similar, except for the higher prevalence of dyslipidemia in the placebo group. The CaCO3 group had shown reduced levels of FGF23 compared to the placebo group, -8.03 vs. 0.15 pg/ml respectively (p = 0.019). The median level of FGF23 showed a significant decrease only in the CaCO3 group. An increase in eGFR and a slightly decrease in urine phosphate were observed in the CaCO3 group; however, the data was found to be statistically not significant. No significant changes were noted in the serum calcium levels in both groups. Conclusion: The administration of calcium carbonate has been shown to be effective and safe for moderate CKD patients with normophosphatemia due to its effect in lowering FGF23 levels without escalating the serum calcium level.
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Liao, Zisheng, Shijun Wu, Hanxiao Zhang e Fanrong Chen. "Removal of Aqueous Cu2+ by Amorphous Calcium Carbonate: Efficiency and Mechanism". Minerals 12, n. 3 (16 marzo 2022): 362. http://dx.doi.org/10.3390/min12030362.
Testo completoAbstract (sommario):
Crystalline calcium carbonate (CaCO3, such as calcite) could scavenge aqueous metals via adsorption and coprecipitation. As a precursor to crystalline CaCO3, amorphous calcium carbonate (ACC) is poorly understood on metals removal. Herein, we synthesized silica-stabilized ACC and investigated its Cu2+ removal efficiency and mechanism. The results showed that the Cu2+ removal efficiency by ACC is controlled by the initial solution pH, initial Cu2+ concentration, contacting time, and ACC dosage. The maximum Cu2+ removal capacity was 543.4 mg/g at an ACC dosage of 1 g/L, an initial pH of 5.0, an initial Cu2+ concentration of 1000 mg/L, and an equilibrium time of 20 h. X-ray powder diffraction (XRD) and scanning electron microscope with an energy dispersive spectrometer (SEM-EDS) revealed that Cu2+ precipitated as paratacamite (Cu2(OH)3Cl, space group: R3¯) at an ACC dosage of 1 g/L, whereas botallackite (Cu2(OH)3Cl, space group: P21/m) was the Cu-bearing product for crystalline calcite using the same dosage as ACC. However, Cu2+ preferred to incorporate into calcite, which is transformed from ACC at high ACC loading (such as 4 g/L). Our results demonstrated that the crystallinity and dosage of CaCO3 could control the Cu2+ removal mechanism.
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Grube, Katherine. "Labouring bodies: Big Tail Elephants in 1990s Guangzhou". Journal of Contemporary Chinese Art 7, n. 2-3 (1 dicembre 2020): 201–19. http://dx.doi.org/10.1386/jcca_00026_1.
Testo completoAbstract (sommario):
Big Tail Elephant Working Group (daweixiang gongzuo zu, hereafter BTE) is synonymous with the city of Guangzhou and the surrounding Pearl River Delta. Formed in 1991, the group is most closely associated with the artists Chen Shaoxiong (1962–2016), Liang Juhui (1959–2006), Lin Yilin (1964–) and Xu Tan (1957–). This article re-examines BTE artists’ practice from 1991 to 1994 and argues that the artist’s performing body provides the critical lens through which to understand BTE artists’ work during this time. Acknowledging that the experience of BTE’s work was primarily physical, embodied and performative allows for an important reconsideration of not only their works but also the predominant ways in which the global capitalist ‘turn’ in the 1990’s China has been discussed in art historical writing. This article argues that BTE artists were primarily interested in urban forms for what they signified about commercialization as a form of a new political rationality after 1989 and suggests that BTE artists were ultimately concerned with commodification’s transformation of society and of ideas of cultural value.
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Moh. Andri, Budiman e Fabotin Taib. "The Effectiveness of Slow Sand Filtration on Reduction of Iron (Fe) and Calcium (CaCO3) Levels in Water". International Journal of Health, Economics, and Social Sciences (IJHESS) 5, n. 3 (5 luglio 2023): 210–15. http://dx.doi.org/10.56338/ijhess.v5i3.3788.
Testo completoAbstract (sommario):
Ground water or well water is the largest source of clean water used. The most common obstacle in using groundwater is the problem of iron (Fe) and calcium (CaC03) content in raw water. This research aims to determine the effectiveness of slow sand filtration to reduce Fe and CaCO3 levels in water. This type of research is a pure experimental study in a re-treatment design (One Group Pretest Posttest). The samples of raw water were taken from water pump wells owned by residents on JI. Datu Adam, Lere Village. Sample testing after slow sand filtering was carried out at the UPTD Laboratory of the Office of Environment, Donggala. The filter was carried out with a medium thickness of 45 cm sand, 5 cm gravel sand, 7 cm gravel and 5 cm high puddle water. Before filtering the test results Fe 0.4mg/L and CaCO3 546.37mg/L. Based on the effectiveness test of slow sand filtration with 3 treatments, it was found that the levels of substances after filtering were iron (Fe) 0.29, 0.21 and 0.I2 mg/L respectively, while calcium (CaCO3) was 273.41, 241.35 and 210.11 mg/L respectively. From these results, slow sand filtration is effective in reducing Fe and CaCO3 levels in water. The community is expected to be able to use simple filtering media such as slow sand filters to reduce iron (Fe) and calcium (CaCO3) levels in water. It is also expected to provide additional knowledge studies in the field of public health, especially environmental health.