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Valorization of bottom ash with geopolymer synthesis: Optimization of pastes and mortar

  • Froener, Muriel S.;Longhi, Marlon A.;de Souza, Fabiana;Rodriguez, Erich D.;Kirchheim, Ana Paula
    • Advances in concrete construction
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    • v.14 no.1
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    • pp.1-13
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    • 2022
  • Due to the physical-chemical characteristics of some bottom ash (BA), there are technical, economic and environmental limitations to find a destination that will add value to it. In Brazil, this residue is eventually used for filling coal extraction pits or remains in sedimentation ponds, creating a susceptible panorama to environmental issues. The geopolymers binders are one of the alternatives to the proper use high amounts of these materials. In this work, geopolymeric binder pastes were produced with BA mixed to activators with different alkali contents (expressed as %Na2O), as well as the incorporation of soluble silicates (Ms content). The production of binary geopolymeric pastes based on the use of two industrial wastes: fluid catalytic cracking (FCC) and aluminum anodizing sludge (AAS), was also assessed. The content in mass of BA/FCC and BA/AAS ranged from 100/0, 90/10; 80/20 and 70/30. Systems with soluble silicates as activator in a molar ratio SiO2/Na2O of 1.0 (Ms = 1.0) and Na2O content of 15%, showed the best results of mechanical strength (42 MPa at day 28th). The improvement is up to 5X when compared to NaOH based systems. For systems with partial replacement of BA of 10% of AAS and 20% of FCC (80/20), the presence of soluble silicates was also effective to increase compressive strength.

Spectrophotometric evaluation of restorative composite shades and their match with a classical shade guide

  • Rafael Melara;Luciana Mendonca;Fabio Herrmann Coelho-de-Souza;Juliana Nunes Rolla;Luciano de Souza Goncalves
    • Restorative Dentistry and Endodontics
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    • v.46 no.4
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    • pp.60.1-60.8
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    • 2021
  • Objectives: The aim of this study was to verify the match between 5 shades of composites from different manufacturers with a shade guide and among the systems using a portable spectrophotometer. Materials and Methods: Shade measurements were performed on specimens of Z350 XT (3M ESPE), Charisma Diamond (Heraeus Kulzer GmbH), Esthet X-HD (Dentsply Caulk), and Empress Direct (Ivoclar-Vivadent) for shades A1, A2, A3, B1, and C3 using a Vita Easyshade spectrophotometer (Vita Zahnfabrik) against a white background. Corresponding shades of Vitapan Classical (Vita Zahnfabrik) guide were measured likewise and shade variation (ΔE) was calculated based on International Commission on Illumination L*a*b* parameters. The ΔE of the composites in each shade was compared by one-way analysis of variance and Tukey's post hoc test (α = 0.05). Results: All composites presented ΔE > 3.7 compared with the shade guide. Variation in shades A3, B1, and C3 was significantly different for all composites. ΔE of Z350 XT was significantly lower for A1 than for the other shades, whereas ΔE of Z350 XT and Charisma Diamond were significantly lower for A2 than for the other shades. Conclusions: No composite shade matched with the shade guide. Equivalent shades of the restorative composite from different manufacturers may show clinically noticeable ΔE.

Effects of a Hypocaloric Diet with or without Strength Training on Intermuscular Adipose Tissue Mass and Serum Lipid Concentrations in Obese Elderly Women (비만 노인 여성에서 저열량식과 근력운동의 병행이 근내지방과 혈중지질에 미치는 영향)

  • Kim, Jaehee
    • Korean Journal of Exercise Nutrition
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    • v.13 no.1
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    • pp.9-14
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    • 2009
  • The effects of a hypocaloric diet with or without strength training on body fat distribution and serum lipid concentrations in obese elderly women were investigated. Twenty-six healthy women (age 66±4.6 yr; body mass index 32.3±2.9 kg/m2) were randomly assigned to 3 groups: control (C; n=8), hypocaloric diet (DO; n=9) or hypocaloric diet with strength training (DST; n=9). Subcutaneous adipose tissue (SAT), visceral adipose tissue (VAT), and inter and intra muscular adipose tissue (IMAT) were measured using magnetic resonance imaging. Serum lipid concentrations including total cholesterol (TC), high density lipoprotein cholesterol (HDLC), low density lipoprotein cholesterol (LDLC), and triglycerides (TG) were measured. No significant changes occurred in body weight and percent body fat in the C group over the 16-week period. The DO and DST groups lost similar amounts of weight and fat after 16 weeks. SAT and VAT decreased after weight loss in the DO and DST groups but not in the C group. IMAT was significantly reduced in the DO and DST groups, whereas in the C group IMAT increased. The loss in IMAT mass was similar in the DO and DST groups. TC and LDLC decreased in the DO and DST groups but not in the C group. There were no differences between the DO and DST groups in decrease in TC and LDLC. HDLC decreased in the DO group but not in the C and DST groups. TG tended to decrease in the DST group. In conclusion, body fat distribution including SAT, VAT, and IMAT and serum lipid concentratons were modulated by weight loss resulting from the hypocaloric diet with or without strength training in obese elderly women. Strength training did not enhance the improvement in body fat distribution and serum TC and LDLC concentrations by the hypocaloric diet.

Space Composition and Layout of the Location of Seon-Un Temple (선운사 입지의 공간구성과 가람 배치)

  • Young-Han Bae;Jeong-Hae Park
    • Industry Promotion Research
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    • v.9 no.2
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    • pp.137-151
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    • 2024
  • This study analyzes the feng shui characteristics of the location of Seon-un Temple in Do-sol Mountain, Gochang from a metaphysical and selfish perspective through field research and literature review.A characteristic element of feng shui was that it prioritized harmony with nature and made it a reference point for selecting a location through a reasonable method. In the Silla Dynasty, adherent monks studied in the Gangseo area, where the Hyeongsepungsu first appeared, and this Hyeongsepungsu of the Gangseo District Law flowed into Korea and played a leading role in selecting the location of the temple and arranging Garam. Seon-un Temple was located under Do-sol Mountain and had no choice but to have great significance, and it was a practice of the desire to achieve Buddhist perfection through Do-sol Stream and Do-sol Small Temple, which enter the kingdom of Buddha. A s a result, the location of Seon-un Temple under Do-sol Mountain in Gochang reflected a variety of feng shui characteristics. In particular, the location of Sun-un Temple in Do-sol Mountain logically used the characteristics and meanings of feng shui and practiced becoming one with nature, which is aimed at spreading Buddhist doctrine and ideology, which has the holiest meaning of Buddhism.

A Study on the Improvement Measures for Export Support Projects for SMEs in Jeollabuk-do (중소기업 수출지원 사업 활용 현황 및 개선방안에 관한 연구: 전라북도 지역을 중심으로)

  • Bangwool Han;Minho Kim
    • Asia-Pacific Journal of Business
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    • v.14 no.4
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    • pp.387-399
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    • 2023
  • Purpose - The purpose of this study is to review the export support projects in Jeollabuk-do and to provide implications to the policy makers and to the local exporters. Based on this review, the study proposes future measures to enhance the efficiency of the current Jeollabuk-do export support project. Design/methodology/approach - This study reviews export support projects in Jeollabuk-do, d examines program types and utilization status, and subsequently summarizes the key aspects of Jeollabuk-do SMEs' export support projects. Findings - This study suggests that Jeollabuk-do's export support project can become more effective through active development of overseas markets and professional integration of marketing activities, particularly focusing on regionally specialized export products. Additionally, given the crucial roles played by the government, related agencies, and local offices in improving the export capabilities of SMEs in Jeollabuk-do, there is an emphasis on the need for continuous and systematic follow-up management and the establishment of export support projects and services. Research implications or Originality - While small and medium-sized enterprises (SMEs) in Korea account for a significant portion of export activities, their actual export performance and contribution are low. The export competitiveness of SMEs, particularly those located in regions other than Seoul and Gyeonggi Province, is not improving despite various export support projects being promoted. Under the circumstances, this study provide meaningful implications to the policy makers and to the local exporters.