[Oral Session 4] DEINKING OF COLORED OFFSET NEWSPRINT WITH ENZYME TREATMENT IN COOPERATION WITH ULTRASONIC WAVE

Yimin XIE,Hong WU,Yanming LAI 한국펄프·종이공학회 1999 한국펄프종이학회 기타 간행물 Vol.- No.-

A new process for deinking of colored offset newsprint, i.e. enzyme treatment in cooperation with ultrasonic wave was developed in the present study. The physical characteristics such as fiber length, coarseness, crystallinity index of the de inked pulps were investigated and the sugar residues released from the treatment were analyzed. It was found that colored offset newsprint could be deinked effectively by cellulase treatment when ultrasonic wave was applied. The brightness increased by 5%ISO over that of control experiment and the pigment content was reduced markedly. Though the ultrasonic wave had little effect on the strength and crystallinity of the pulp, the treatment of enzyme combined with ultrasonic wave reduced the coarseness and fiber length to some extent. It was also found that ultrasonic wave could accelerate the hydrolysis of cellulose and hemicellulose during the cellulase treatment.

Investigation of muscle-specific beef color stability at different ultimate pHs

Wu Shuang,Han Jina,Liang Rongrong,Dong Pengcheng,Zhu Lixian,Hopkins David L.,Zhang Yimin,Luo Xin 아세아·태평양축산학회 2020 Animal Bioscience Vol.33 No.12

Objective: This study was aimed to investigate the muscle-specific beef color stability at normal and high ultimate pHs. Methods: The impact of muscle (Longissimus lumborum [LL] vs psoas major [PM]) and pH (normal ultimate pH [Np] vs high pH dark cutting beef [Hp]) on color stability, indicated by basic color traits, metmyoglobin reducing activity (MRA) and oxygen consumption (OC), as well as the lipid oxidation, were determined over 7 days of display at 4°C. Results: Hp-LL had the highest pH (6.92), followed by Hp-PM (6.01), Np-PM (5.76), and Np-LL (5.52). Hp-LL had increased (p<0.05) a*, chroma and % oxymyoglobin during display. Hp-LL also had the highest metmyoglobin (MMb) reducing activity and OC among all the samples, thus, the greatest color stability, although very dark throughout storage, with lowest values for lightness (L*) and yellowness (b*). Np-LL also exhibited relatively high color stability, as a result of its lower % MMb and OC and higher MRA than psoas muscle samples. The 0.2 unit difference of the pH between Hp and Np psoas muscle, resulted in the difference of the color intensity, not the color stability. Interestingly, high pH psoas muscle (Hp-PM) did not have better color stability than Np-PM, and in fact had lower color stability than even Np-LL. The similar level of OC and lipid oxidation cannot explain the difference in color stability between Hp-PM and Np-LL. Conclusion: The Hp does not always show better color stability compared with Np beef, which depends on the muscle type. The balance of MRA and OC is important to keep the color in great intensity and stability in the meantime.

An optimization method for vibration suppression and energy dissipation of an axially moving string with hybrid nonclassical boundaries

Yuanfeng Wu,Enwei Chen,Neil S Ferguson,Yuteng He,Haozheng Wei,Yimin Lu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.3

The axially moving string model is widely used in engineering applications and is of great significance in research. To suppress transverse vibration and facilitate energy dissipation of the axially moving string with nonclassical boundaries, a bi-objective optimization model and methodology are proposed for its boundary parameters’ design. First, an approximate numerical model for an axially moving string with a nonclassical boundary is established, which is based on the finite element method (FEM) and Newmark-beta method. Then, a biobjective model is proposed, including the average transverse vibration and the average system energy in a single traveling wave period, and a particle swarm optimization (BOPSO) algorithm is established for optimization. Finally, the proposed optimization model is applied in a numerical example, and the results are compared with NSGA-II, a multi-objective cuckoo search algorithm (MOCSA), and multi-objective flower pollination algorithm (MOFPA) to verify the feasibility of the proposed methodology.

An active learning hybrid reliability method for positioning accuracy of industrial robots

Dequan Zhang,Song Liu,Jinhui Wu,Yimin Wu,Jie Liu 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.8

Popsitioning accuracy is an important index for evaluating the capacity of industrial robots. As a mechanism with multi-degree of freedom, the uncertainties of industrial robots are diverse and analyzing the positioning accuracy reliability is time consuming. To improve computation efficiency, a new active learning method based on Kriging model is proposed for hybrid reliability analysis of positioning accuracy with random and interval variables. In this study, the updated samples were selected through U learning function in the vicinity of limit-state function. A new stopping criterion based on expected risk function was exploited to judge whether the accuracy of Kriging model is enough. Two numerical examples and one engineering example were provided to verify the efficiency and accuracy of the proposed method. The results indicate that the proposed method is accurate and efficient.

A New Ambiguity Elimination Method for BSS Block Signals in Time Domain

Wei Zhao,Fengshan Wang,Yuehong Shen,Yuanyuan Wu,Zhigang Yuan,Pengcheng Xu,Pengcheng Xu,Yimin Wei,Wei Jian 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.11

This paper deals with the ambiguity problem of blind source separation (BSS) in the case where continuously received mixture signals are split in time and processed block by block. Due to the inherent permutation and scaling ambiguities of BSS, tying the separated components at each adjacent time blocks doesn’t recover the original source signals correctly in general. Inspired by the Permutation Method of reconstructing source signal blocks in time domain, a new ambiguity elimination approach is proposed in this paper. This method aims to concatenate the separated components in adjacent blocks by artificially setting contrast blocks for each adjacent time blocks. The core idea of this method is to utilize the associativity between components recovered from contrast blocks and corresponding adjacent blocks. Compared with Permutation Method, the main advantage of this new method consists in the fact that it is much more efficient in terms of separation quality and computational speed. Besides, a tradeoff can be adjusted between separation quality and computational speed by choosing different length of contrast blocks. Real-life experiments are performed to validate the performance of this method on the wireless communication system with two transmitting and receiving antennas.

Mussel Adhesive Protein/platelet-rich Plasma Composite-coated Titanium Surfaces Increase Functionality of Dermal Fibroblasts

Zhongshan Wang,Haiyan Qin,Zhihong Feng,Guofeng Wu,Shizhu Bai,Yan Dong,Yimin Zhao 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.3

Bacterial invasion and epithelial downgrowth with pocket formation are still severe clinical challenges for transcutaneous implants, and both have a close relationship with the lack of a stable biological seal around the transcutaneous parts. Dermal fibroblasts are the main cells in the skin tissue and have been proven to play vital roles in the formation of biological seals. In this work, platelet-rich plasma (PRP), which can release high concentrations of natural cytokines upon activation, was used to stimulate rapid fibroblast growth. Mussel adhesive proteins (MAPs) were used as mediators to anchor the platelets in the PRP onto Ti surfaces, and MAP/PRP composite-coated Ti surfaces were constructed successfully. This in vitro study indicated increased fibroblast adhesion (P < 0.05), spreading, and proliferation (P < 0.05) and upregulated extracellular matrix-related gene expression (P < 0.05) on a MAP/PRP composite-coated Ti surface compared with a control smooth Ti surface. Our results suggest that MAP/PRP composite-coated Ti surfaces are potentially useful for the formation of a stable biological seal in transcutaneous areas.