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White, James L .,Kim, Kwang Jea 한국공업화학회 2001 Journal of Industrial and Engineering Chemistry Vol.7 No.1
Treated silica particles with four different silane coupling agents with different silane chain length were compounded in EPDM using an internal mixer, and their agglomerate sizes, viscosity, and extrudate swell were investigated. The treated silica compounds showed a smaller agglomerate size, lower viscosity, and lower swell reduction than the untreated silica compound after equivalent mixing times. The bis(triethoxysilyl-propyl)tetrasulfane (TESPT) treated silica compound exhibited a lower viscosity than the other treated compounds, however exhibited a large agglomerate size, whereas the short chain silane (SN203) treated compounds exhibited a smaller agglomerate size with a higher viscosity. The long chain silane (SN116) treated compound exhibited a lower viscosity with a better dispersion than the TESPT treated compound. TESPT acted as a processing aid in the silica/EPDM compounds. The extrudate swell reduction of the TESPT, SA2T, SN203, SN208, and SN116 treated silica compounds was less than that of the untreated silica compounds.
Effects of a Single Bout of Yoga on Self-esteem, Self-efficacy, and Happiness of College Students
James White III,Boyd, Joni 한국체육학회 2021 International journal of human movement science Vol.15 No.1
The purpose of this study was to determine the effects of a single bout of yoga on happiness, self-esteem, and self-efficacy for exercise in a volunteer sample of 25 college students from a public university in southeastern United States. Previous research explored long-term effects of yoga on mental health, but the effects of a single bout of yoga are unclear. Volunteers from a summer-session yoga course completed 26 items on demographics, happiness, self-esteem, and self-efficacy for exercise, before and after their first 30-minute yoga session. Paired samples t-test showed no significant differences in pre- and posttest scores of measured variables: % happy (M=62.7; M=62.9; p=.976), % unhappy (M=23.2; M=25.1; p=.662), % neutral (M=33.5; M=30.6; p=.650, self-esteem (M= 28.8; M=29.6; p=.721), and self-efficacy to exercise (M=16.0; M=17.4; p=.292). Although no significance was found, future research should focus on the impact of yoga (both single-bout and long-term effects) on health variables in a larger sample, and within diverse populations. Future research should also consider the effects of other exercise protocols, including steady state aerobic, high-intensity interval training, and resistance training.
Silica Agglomerate Breakdown in Three - Stage Mix Including a Continuous Ultrasonic Extruder
White, James L .,Kim, Kwang Jea 한국공업화학회 2000 Journal of Industrial and Engineering Chemistry Vol.6 No.6
The dispersive mixing of premixed nano-size untreated and treated silica particles, and compounds in ethylene-propylene-diene terpolymer (EPDM) were studied using an ultrasonic extruder (Ultra) and compared with an internal mixer (Int) processing. The rheological properties and extrudate swell of the compounds were investigated and compared with carbon black filled compounds. The Ultra processing broke down the silica agglomerate sizes effectively, which became smaller than after an Int processing. The silane treated silica exhibited a considerable reduction in the agglomerate sizes compared to the untreated silica in an Int. These results were then compared with carbon black filled compounds. The viscosity of the compounds with untreated and treated silica was higher than the compounds with carbon black. This may be due to the rough surface of the silica particles. The silane treated compounds exhibited a lower viscosity than the untreated compounds. The effect of extrudate swell reduction was minimal on the treated compounds.
Practical Circuits with Physarum Wires
James GH Whiting,Richard Mayne,Nadine Moody,Ben de Lacy Costello,Andrew Adamatzky 대한의용생체공학회 2016 Biomedical Engineering Letters (BMEL) Vol.6 No.2
Purpose Protoplasmic tubes of Physarum polycephalum,also know as Physarum Wires (PW), have been previouslysuggested as novel bio-electronic components. Until recently,practical examples of electronic circuits using PWs have beenlimited. These PWs have been shown to be self repairing,offering significant advantage over traditional electroniccomponents. This article documents work performed toproduce practical circuits using PWs. Methods We have demonstrated through manufacture andtesting of hybrid circuits that PWs can be used to produce avariety of practical electronic circuits. A plurality of differentapplications of PWs have been tested to show the universalityof PWs in analogue and digital electronics. Results Voltage dividers can be produced using a pair ofPWs in series with an output voltage accurate to within 12%. PWs can also transmit analogue and digital data with afrequency of up to 19 kHz, which with the addition of abuffer, can drive high current circuits. We have demonstratedthat PWs can last approximately two months, a 4 fold increaseon previous literature. Protoplasmic tubes can be modifiedwith the addition of conductive or magnetic nano-particles toprovide changes in functionality. Conclusions This work has documented novel macro-scaledata transmission through biological material; it has advancedthe field of bio-electronics by providing a cheap and easy togrow conducting bio-material which may be used in futurehybrid electronic technology.
White, James L .,Kim, Kwang Jea 한국공업화학회 2000 Journal of Industrial and Engineering Chemistry Vol.6 No.4
The breakdown rates of filler agglomerates, compounded in ethylene-propylene-diene terpolymer (EPDM) matrix, were compared using silica, carbon black, calcite, talc and zinc oxide in an internal mixer (Int). The shear viscosity and the extrudate character were used for investigation. Small sized, silica agglomerates were the most difficult particle to disperse. The small silica particle filled EPDM system exhibited the highest viscosity level. The quality of the extrudate smoothness improved, but the magnitude of the swell d/D decreased with small size particles. Among the fillers used, the zinc oxide exhibited the poorest character in the extrudate quality.