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Ting-Yu Hu,Chieh Wang,Kai-Chieh Yang,Li-Jen Chen 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-
Ring-like residual deposits are often observed after drying suspension droplets on surfaces. That introducesa crucial defect in practical applications, such as ink-jet printing that requires a uniform deposit. In this study, depositions after drying sessile/pendant droplets with silica/polystyrene particles wereexamined to identify the effect of gravitational sedimentation of particles on self-pinning and depositionpattern. The suspension droplet with larger polystyrene (or silica) particles would trigger the self-pinningat larger (or smaller) particle concentrations. The deposition pattern of pendant drops with silica particlesis hill-like. This is due to the large density difference between silica and water to induce high sedimentationvelocity, and the particles would precipitate and aggregate along the air–liquid interface to form ahollow shell deposit. The depositions for suspensions with bi-dispersed particles, the larger silica particleswould accumulate at the bottom of the deposit due to the higher sedimentation velocity, in contrastto the well-mixed in the deposits for bi-dispersed polystyrene particles. The sedimentation and capillaryflow velocities were calculated and discussed. These new findings reveal that the particle density (gravityeffect) can be used to adjust the sedimentation velocity to control the deposition morphology and particlesize distribution even to suppress the coffee-ring effect.
EXTERNAL COSTS OF INLAND CONTAINER TRANSPORTATION
Paul T-W Lee,Kai-Chieh Hu,Tao Chen,Jo-Ping Hsiung 인하대학교 정석물류통상연구원 2008 인하대학교 정석물류통상연구원 학술대회 Vol.2008 No.3
This paper aims to explore the external costs of inland container transportation in Taiwan, by analyzing the origin and destination of current container cargo in Taiwan, after reviewing an extensive literature survey of methods of external costs. A comparison of external costs between truck and SSS by corridor is made by using a model developed in this paper. Based on the findings that external costs of SSS is considerably lower than truck transport mode and can be an alternative of modal split for current inland container cargo transportation, we discuss the significance and managerial implications of SSS from the perspective of green logistics. In so doing, a top-down approach is employed for developing government policies, which aim to not only reduce the external costs of inland container transportation but also promote SSS in Taiwan.