• Title, Summary, Keyword: nut quality

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Antioxidant Activity and Quality Characteristics of Mung Bean Starch Gel Prepared with Ginkgo Nut Powder (은행 분말을 첨가한 청포묵의 항산화활성 및 품질특성)

  • Joo, Shin-Youn;Choi, Hae-Yeon
    • Journal of the Korean Society of Food Culture
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    • v.29 no.1
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    • pp.84-90
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    • 2014
  • This study investigated the effects of ginkgo nut powder on the antioxidant activity and quality characteristics of mung bean starch gel. Mung bean starch gels were prepared with different amounts of ginkgo nut powder (0, 1, 3, 5, and 7%). The antioxidant activity of ginkgo nut powder and mung bean starch gel was estimated through measuring DPPH free radical scavenging activity and total phenolic acid content. For analyzing quality characteristics several factors were considered: syneresis, pH, color, texture profile analysis, and sensory evaluations. In the results, syneresis in the treated group was higher than the control group. The pH, b values, total phenolic acid content, and DPPH free radical scavenging activity of mung bean starch gels also significantly increased with increasing ginkgo nut powder. In contrast, the L values and a values of mung bean starch gels significantly decreased with increasing ginkgo nut powder. In the texture profile analysis, the mung bean starch gels with 5% and 7% ginkgo nut powder showed significantly lower degrees of hardness, chewiness, and gumminess. On the other hand, cohesiveness was highest in the mung bean starch gels with 5% and 7% ginkgo nut powder. The consumer acceptability score for the mung bean starch gel prepared with 5% and 7% ginkgo nut powder ranked significantly higher than the other groups in flavor and taste. Overall, these results suggest that ginkgo nut powder is a good ingredient for increasing the consumer acceptability and functionality of mung bean starch gel.

Analysis of the Accidental Hydrogen Embrittlement Affecting the Track Nut of Self-Propelled Howitzer (자주포 궤도 너트에 미치는 우발적 수소취성 현상의 영향)

  • Gil, Hyeon-Jun;Kim, Byeong-Ho;Kang, Hyeon-Jae;Seo, Jae Hyun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.15 no.3
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    • pp.72-78
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    • 2016
  • In this study, we analyzed the accidental hydrogen embrittlement affecting the track nut on a self-propelled howitzer. Tracks are key components to maintain a high degree of confidence in the operation of the self-propelled howitzer and the safety of the crew. This study analyzed the fractured surface using SEM to review accidental damage of the wedge nut. In addition, we conducted revival tests and analyzed the results to identify the cause of the wedge nut damage from hydrogen embrittlement. We should carry out factor analysis and continuous improvement of the manufacturing process to determine the accidental breakage mechanism for future enhancement of the self-propelled howitzer. This study will be the useful reference for enhancing process designs in similar products.

The Effect of Processing Condition on Preference in Sensory Quality of Pine Nut Gruel (잣죽의 제조조건이 관능적 품질의 기호도에 미치는 영향)

  • Zhang, Xian;Lee, Fan-Zhu;Kum, Jun-Seok;Ahn, Tae-Hoi;Eun, Jong-Bang
    • Korean Journal of Food Science and Technology
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    • v.35 no.1
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    • pp.33-37
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    • 2003
  • Sensory quality of pine nut gruel was investigated to determine the effects of processing conditions on its quality. Response surface methodology was applied to investigate effects of water volume and pine nut weight ratios to rice weight and heating time on the preference of pine nut gruel in terms of color, flavor, viscosity, taste, and overall acceptance. Results showed that processing conditions did not affect the color of pine nut gruel. Viscosity and overall acceptance were affected by the ratio of water volume to rice weight and heating time. $R^2$ of response surface regression equations were 0.6954, 0.8333 (p<0.05), 0.9668 (p<0.01), 0.8664 (p<0.05), and 0.8159 (p<0.10) for color, flavor, viscosity, taste, and overall acceptance respectively. No relationship was observed between color and overall acceptance. The relationship between viscosity and overall acceptance was the highest.

The Joining Quality of High Strength Bolt, Nut and Washer Set (A490) in the Extreme Conditions (극한 상태에서 A490 고장력 볼트 세트의 체결 품질 연구)

  • Suk, Han-Gil;Cho, In-Seup;Hong, Hyeon-Sun
    • Journal of the Korean institute of surface engineering
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    • v.44 no.1
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    • pp.21-25
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    • 2011
  • This test focuses on the correlation between the lubrication, ductility and strength through the change of nut lubricant which decides joining angle for A490 bolt sets required in the AASHTO (American Association of State Highway & Transportation Officials). Because the lubrication of high tension bolt, nut, washer sets becomes an important factor to ductility and joining load, the quality improvement is required for improving reliability and securing enough lubrication of maker and user. This study examines the quality characteristics required in the specification through tests because only this standard specifies joining quality in the extreme conditions (as much about two times of the joining angle on site as normal condition). Moreover, this study is limited to the test on joining axial force required in the AASHTO for the three nut lubrication conditions of A490 bolt set. It is concluded that the nuts should be coated or waxed enough for the improvement of the joining axial force and ductility of bolts required in the standards. It is shown that in the case of plain high tension bolt sets, a rust preventing lubricative oil shall be applied and the torque coefficient value for A490 bolt sets should be maintained below 0.175.

Effect of Chemical Composition of Nut Material on the Fracture Behavior in Nut Projection Welding of Hot-Stamped Steel Sheet (핫스탬핑강의 너트 프로젝션 용접시 너트 재질이 용접부 파단모드 변화에 미치는 영향)

  • Lim, Sung-Sang;Kim, Young-Tae;Chun, Eun-Joon;Nam, Ki-Sung;Park, Young-Wan;Kim, Jae-Wan;Lee, Sun-Young;Choi, Il-dong;Park, Yeong-Do
    • Journal of Welding and Joining
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    • v.34 no.2
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    • pp.1-10
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    • 2016
  • The use of materials for modern lightweight auto-bodies is becoming more complex than hitherto assemblies. The high strength materials nowadays frequently used for more specific fields such as the front and rear sub frames, seat belts and seats are mounted to the assembled body structure using bolt joints. It is desirable to use nuts attached to the assembled sheets by projection welding to decrease the number of loose parts which improves the quality. In this study, nut projection welding was carried out between a nut of both boron steel and carbon steel and ultra-high strength hot-stamped steel sheets. Then, the joints were characterized by optical and scanning electron microscope. The mechanical properties of the joints were evaluated by microhardness measurements and pullout tests. An indigenously designed sample fixture set-up was used for the pull-out tests to induce a tensile load in the weld. The fractography analysis revealed the dominant interfacial fracture between boron steel nut weld which is related to the shrinkage cavity and small size fusion zone. A non-interfacial fracture was observed in carbon steel nut weld, the lower hardness of HAZ caused the initiation of failure and allowed the pull-out failure which have higher in tensile strengths and superior weldability. Hence, the fracture load and failure mode characteristics can be considered as an indication of the weldability of materials in nut projection welding.

Inhibition of the Aspergillus flavus Growth and Aflatoxin B1 Contamination on Pistachio Nut by Fengycin and Surfactin-Producing Bacillus subtilis UTBSP1

  • Farzaneh, Mohsen;Shi, Zhi-Qi;Ahmadzadeh, Masoud;Hu, Liang-Bin;Ghassempour, Alireza
    • The Plant Pathology Journal
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    • v.32 no.3
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    • pp.209-215
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    • 2016
  • In this study, the treatment of pistachio nuts by Bacillus subtilis UTBSP1, a promising isolate to degrade aflatoxin B1 (AFB1), caused to reduce the growth of Aspergillus flavus R5 and AFB1 content on pistachio nuts. Fluorescence probes revealed that the cell free supernatant fluid from UTBSP1 affects spore viability considerably. Using high-performance liquid chromatographic (HPLC) method, 10 fractions were separated and collected from methanol extract of cell free supernatant fluid. Two fractions showed inhibition zones against A. flavus. Mass spectrometric analysis of the both antifungal fractions revealed a high similarity between these anti-A. flavus compounds and cyclic-lipopeptides of surfactin, and fengycin families. Coproduction of surfactin and fengycin acted in a synergistic manner and consequently caused a strong antifungal activity against A. flavus R5. There was a positive significant correlation between the reduction of A. flavus growth and the reduction of AFB1 contamination on pistachio nut by UTBSP1. The results indicated that fengycin and surfactin-producing B. subtilis UTBSP1 can potentially reduce A. flavus growth and AFB1 content in pistachio nut.

Leakage-reduction Measures at a Joint between CPVC Piping for a Sprinkler System and a Pipe Expansion (스프링클러설비용 CPVC관과 신축배관 접속부분에서의 누수저감 대책에 관한 연구)

  • Lim, Chun-Ki;Lim, Yun-Tack;Baek, Eun-Sun
    • Fire Science and Engineering
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    • v.29 no.3
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    • pp.21-30
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    • 2015
  • In this study, we try to suggest measures to reduce leakage at a joint between CPVC piping for a sprinkler system and a pipe expansion through reviews of domestic and foreign standards and related tests. The quality of the waterproof rubber packing material between a valve socket and pipe expansion nut was examined. In the leak test, the valve socket material over the expansion part of the metal pipe nut was found to use a metal part or a schlorinated polyvinyl chloride pipe nut part. In addition, the KS B 0221 standard for parallel pipe threads with threaded and thread inspection criteria and inspection standards in order to ensure an acceptable quality of valve socket, there is a need to amend the regulations to comply with the KS B 5223 (screw thread limit gauges parallel pipe threads). We do not have detailed standards for expansion piping nuts for waterproof rubber ring material, so we need to amend the relevant criteria for EPDM material to be used with excellent waterproofing, for which both NBR and EPDM are currently used.

Postharvest Nut Quality, and Changes of Soluble Solids Content and Kernel Hardness During Cold Storage in Korean Prevailing Chestnut Cultivars (밤 재배품종의 수확 후 과실품질 및 저온저장 중 밤 과실의 당도 및 경도 변화)

  • Kim, Mahn-Jo;Lee, Uk;Kim, Sun-Chang;Hwang, Myoung-Soo;Kwon, Yong-Hee;Lee, Moon-Ho
    • Journal of Korean Society of Forest Science
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    • v.95 no.6
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    • pp.672-679
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    • 2006
  • Postharvest nut quality, and changes of soluble solids content and kernel hardness during cold storage in 13 Korean prevailing chestnut cultivars were investigated to establish the chestnut grading and standardization for marketing and processing industry. Chestnut quality attributes such as nut weight, soluble solids content, kernel hardness, % with the pericarp split, and % of polyembryonic nuts were measured from 2001 to 2005. There were significant difference among cultivars in quality characteristics, and also annual variation within same cultivar, corresponded to the high genetic and environmental variability. During cold storage at $2^{\circ}C$ for 16 weeks, remarkable changes in soluble solids content were observed, and Isseumo showed the highest increase of 8% at 16 weeks of cold storage compared with postharvest. In case of most cultivars except early ripening cultivars, soluble solids content of chestnut increased until 12 weeks during cold storage, followed by decreased gradually thereafter. Kernel hardness of most cultivars except lshizuchi during cold storage increased slightly, but it was not statistically significant. This work would be a useful reference to the quality of each chestnut cultivar for the growers and breeders alike.

Development of High Precision Fastening torque performance Nut-runner System (고정밀 체결토크 성능 너트런너 시스템 개발)

  • Kim, Youn-Hyun;Kim, Sol
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.4
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    • pp.35-42
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    • 2019
  • Nut fasteners that require ultra-precise control are required in the overall manufacturing industry including electronic products that are currently developing with the automobile industry. Important performance factors when tightening nuts include loosening due to insufficient fastening force, breakage due to excessive fastening, Tightening torque and angle are required to maintain and improve the assembling quality and ensure the life of the product. Nut fasteners, which are now marketed under the name Nut Runner, require high torque and precision torque control, precision angle control, and high speed operation for increased production, and are required for sophisticated torque control dedicated to high output BLDC motors and nut fasteners. It is demanded to develop a high-precision torque control driver and a high-speed, low-speed, high-response precision speed control system, but it does not satisfy the high precision, high torque and high speed operation characteristics required by customers. Therefore, in this paper, we propose a control technique of BLDC motor variable speed control and nut runner based on vector control and torque control based on coordinate transformation of d axis and q axis that can realize low vibration and low noise even at accurate tightening torque and high speed rotation. The performance results were analyzed to confirm that the proposed control satisfies the nut runner performance. In addition, it is confirmed that the pattern is programmed by One-Stage operation clamping method and it is tightened to the target torque exactly after 10,000 [rpm] high speed operation. The problem of tightening torque detection by torque ripple is also solved by using disturbance observer Respectively.