• 한국자기학회지
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• 제5권5호
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• pp.667-671
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• 1995

The viscometric technique is used to study the effects of microstructure on the viscosity (viscosity vs. concentration or shear rate) of magnetic particle suspensions. In this characterization, measurement of suspension viscosity is used to obtain the dependence of viscous energy dissipation on microstructural state of dispersions. Microstructural shape effects which are related to particle orientation are then indirectly obtained. Empirical formulas from mean field theory and the Mooney equation, which are applicable at high concentration of magnetic particles, are used to relate viscosity to particle concentration. The validity and physical meaning of these equations are discussed.

• 한국식품영양과학회지
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• 제44권9호
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• pp.1407-1413
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• 2015

본 연구는 '고운' 품종으로 제조한 감자가루 분산액의 농도(3, 4, 5, 6, 7%, w/w)에 따른 유변학적 및 페이스팅 특성에 대하여 평가하였다. 감자가루 분산액은 전단담화 거동(n=0.41~0.55)을 나타냈으며, 감자가루 농도가 증가함에 따라 점조도 지수(n), 겉보기 점도(${\eta}_{a,100}$), Casson 항복응력(${\sigma}_{oc}$)값이 증가하는 경향을 나타내었다. 또한 동적 점탄 특성 측정 결과에 의하면 감자가루 분산액은 약한 겔과 같은 거동을 보여주었으며 G'과 G" 값들은 감자가루 농도와 진동수(${\omega}$)가 증가함에 따라 증가하는 경향을 나타내었다. Cox-Merz 중첩원리는 감자가루 분산액에 잘 적용되지 않았다. RVA에 의한 페이스팅 특성은 감자가루 농도가 증가할수록 peak viscosity, trough viscosity, final viscosity, set back viscosity, break down viscosity 값이 유의적으로 증가하였다.

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제16권1호
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• pp.85-98
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• 2009

Strong convergence theorems on viscosity approximation methods for finite nonexpansive mappings are established in Banach spaces. The main theorem generalize the corresponding result of Kim and Xu [10] to the viscosity approximation method for finite nonexpansive mappings in a reflexive Banach space having a uniformly Gateaux differentiable norm. Our results also improve the corresponding results of [7, 8, 19, 20].

• Nonlinear Functional Analysis and Applications
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• 제28권4호
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• pp.1127-1143
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• 2023

The purpose of this paper, we prove convergence theorems of the modified viscosity inexact Mann iteration process for a family of asymptotically quasi-nonexpansive type mappings in CAT(0) spaces. We also show that the limit of the modified viscosity inexact Mann iteration {x_n} solves the solution of some variational inequality.

• East Asian mathematical journal
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• 제27권1호
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• pp.11-21
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• 2011

In this paper, we try to extend the viscosity approximation technique to find a particular common zero of a finite family of accretive mappings in a Banach space which is strictly convex reflexive and has a weakly sequentially continuous duality mapping. The explicit viscosity approximation scheme is proposed and its strong convergence to a solution of a variational inequality is proved.

• 대한한의학회지
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• 제16권1호통권29호
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• pp.351-369
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• 1995

In order to investigate the effect of Qingbaozhuyutang(淸胞逐瘀湯), Bee Veenom on 'Blood Stasis Pattern', here We regard Thrombosis and Elevated Blood viscosity as Blood Stasis Pattern. rats were injected Endotoxin into the caudal vein to make experimental thrombosis model(control group), and at sample group, rats were orally administrated solid extract of Qingbaozhuyutang(淸胞逐瘀湯) 0.5g/200g or were injected Apitoxin 1mg/Kg into the abdominal region(sample group), and then we observed platelet, fibrinogen, prothrombin time and FDP level. Another group were injected HA into the muscular rump to make experimental elevated blood viscosity instead of Endotoxin. Thereafter we measured whole blood viscosity and plasma viscosity. The results were summarized as follows. 1. Platelets were increased significantly in sample I compared with the control group. 2. Fibrinogen levels were increased significantly in sample I compared with the control group. 3. Prothrombin times were shortened significantly in sample II and sample III compared with the control group. 4. FDP levels were decreased significantly in sample II and sample III compared with the control group. 5. Whole blood viscosity and plasma viscosity were decreased significantly in all shear rates compared with the control group. According to the above results, it is considered that Qingbaozhuyutang(淸胞逐瘀湯) has significant effects on platelets, fibrinogens, prothrombin times, FDP levels, whole blood viscosity and plasma viscosities, therefore it seems to be applicable to disease related to 'Blood Stasis Pattern' through the thrombosis and elevated blood viscosity. But, Veenom has a little effect. the mechanism concerned for the effects is to be investigated in future.

• 한국산학기술학회논문지
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• 제12권10호
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• pp.4673-4678
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• 2011

이 연구에서는 고분자 전해질 막 연료전지의 분리판 용 고분자/흑연 복합소재의 혼합 특성 및 점도 측정 방법에 관하여 연구하였다. 분리판은 전도성이 있어야 하기 때문에 흑연의 함량이 매우 높고 이 때문에 제조된 복합재료의 점도가 높아 점도 측정이 어려운 문제가 있다. 일반적으로 캐필러리 레오메터에서 사용되는 다이로 점도를 측정한 결과 압력이 시간에 따라서 계속 변하고 정상상태의 값을 보이지 않아서 점도 측정이 불가능 했다. 다이의 디자인을 변경하여 측정하면 압력이 정상상태를 보이는 것을 관찰할 수 있었으나, 흑연과 PET를 단순 용융 혼합하여 점도를 측정하는 경우에는 측정된 점도 값이 재현성이 없는 결과를 나타냈다. 여러 차례의 시행 오차 끝에 흑연과 PET를 작은 입자로 분쇄한 후 용융 혼합하면 재현성 있는 점도를 측정할 수 있고, 제조된 복합재료의 전기전도도 값도 재현성 있는 결과를 보임을 관찰하였다.

• Asian-Australasian Journal of Animal Sciences
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• 제16권2호
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• pp.234-238
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• 2003

This experiment was conducted to measure nutrient digestibility and performance in broiler chicks fed diets based on normal and low viscosity rye or barley fed with and without enzyme (pentosanase and $\beta$-glucanase) during a 17 day growth trial. A total of 150 one-day old, male broiler chicks (5 birds per pen and 5 pens per treatment) were randomly assigned to one of six dietary treatments in a $3{\times}3$ factorial design experiment (3 cereals${\times}$2 enzyme levels). Digestibility coefficients were determined using chromic oxide. Digestibility coefficients for dry matter and crude protein were significantly (p=0.0001) higher for the barley-based diets than for any of the rye-based diets. Digestibility coefficients for gross energy did not differ (p>0.05) due to cereal grain. There were no differences in the digestibility coefficients for dry matter and gross energy between chicks fed normal and low viscosity rye. However, the digestibility coefficient for crude protein was higher (p=0.01) for the low viscosity rye compared with the normal viscosity rye. Addition of enzyme to the diet significantly (p=0.0001) increased digestibility coefficients for dry matter, crude protein and energy. There were no significant differences in weight gain, feed intake or feed conversion between birds fed barley or rye or between birds fed normal or low viscosity rye. Enzyme supplementation significantly improved (p=0.0001) weight gain, intake and feed conversion. The overall results of this experiment indicate that unsupplemented barley and rye do not support adequate growth rates in poultry. Enzyme supplementation dramatically improved broiler performance. In addition, genetic selection to reduce the viscosity of rye had only a modest effect on the nutritive value of rye for broilers.

• Journal of Oral Medicine and Pain
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• 제39권3호
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• pp.90-95
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• 2014

Purpose: To investigate viscosity and wettability of hyaluronic acid (HA) solutions according to supplementation of lysozyme and/or peroxidase, and different ionic strength and pH conditions. Methods: Solutions containing HA were prepared using distilled deionized water (DDW) and simulated salivary buffer (SSB) in different conditions. Different concentrations of hen egg-white lysozyme and bovine lactoperoxidase was added into HA solutions. HA solutions with antimicrobials in different ionic strength and pH conditions were prepared. Viscosity was measured using cone-and-plate digital viscometer at six different shear rates and wettability on acrylic resin and Co-Cr alloy was determined by contact angle. Results: The viscosity values of HA dissolved in DDW were decreased in order of HA, HA containing lysozyme, HA containing peroxidase, and HA containing lysozyme and peroxidase. The viscosity values for HA in DDW were decreased as the concentration of lysozyme and/or peroxidase increased. However, the viscosity values for HA in SSB showed no significant changes according to the concentration of lysozyme and/or peroxidase. The viscosity values of HA solutions were inversely proportional to ionic strength and pH. The contact angle of HA solutions showed no significant differences according to tested surface materials, addition of lysozyme and/or peroxidase, and different ionic strength and pH conditions. Contact angles on acrylic resin by HA solutions in all tested conditions were much higher than those by human saliva. Conclusions: The rheological properties of HA supplemented with lysozyme and/or peroxidase in different ionic strength and pH conditions were objectively confirmed, indicating the possibility of HA with lysozyme and/or peroxidase as main components in the development of effective saliva substitutes.

• 접착 및 계면
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• 제17권2호
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• pp.67-71
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• 2016

본 연구에서는 반응성 희석제 함량에 따라 접착강도 및 물성을 향상시키기 위해 polyether polyol/polyester polyol, 4,4-dicyclohexylmethane diisocyanate ($H_{12}MDI$), 2-butanone oxime (MEKO)를 사용하여 저점도 폴리우레탄 핫멜트를 합성하였다. 합성된 저점도 폴리우레탄 핫멜트의 물성은 FT-IR, viscosity meter 및 UTM 등을 통해 확인하였다. 반응성 희석제의 함량이 증가하고 NCO-blocked prepolymer가 감소함에 따라 저점도 폴리우레탄 핫멜트 접착제의 점도는 증가하였으며, OH-terminated oligomer, NCO-blocked prepolymer, 반응성 희석제 함량의 비가 1 : 0.5 : 0.5일 때 1.1 kgf/cm 접착강도를 나타내었다.