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Ramie offers excellent wearability compared to other fibrous material; however, since the inner structure of the fibers remains largely unexplored, this excellent wearability lacks a reasonable explanation. In this study, enzymatic peeling, using xylanase and laccase coupled with PM, FLSM, and SEM, was confirmed to be an effective and efficient method to characterize the inner structure of ramie fibers...
Morphological changes and biochemical process of ramie retting by RAMCD407 was investigated using microscopy techniques, including OM, PLM, FLSM and SEM coupled with enzyme activity analysis. Results showed that retting was completed within 56 h followed by 0.2% NaOH treatment. Residual gum content and breaking strength of the final fiber was 2.84% and 5.2 cN/dtex, respectively. This fulfills the...
Currently, homogeneous transformation method has been widely used for its advantages in robot. Its more commonly used modeling methods are classic Denavit-Hartenberg method and modified Denavit-Hartenberg method, but the relationship between the two is very few devoted. Then, the use area is limited. Therefore, the relationship between classic Denavit-Hartenberg method and modified Denavit-Hartenberg...
In this article, we introduce a power-hopping technique (PH-MAC) that, by alternating between different transmission power levels, aims to deliberately cause packet capture and thereby reduce the impact of collisions in 802.11 WLANs. We first devise an analytical model of the 802.11 protocol with heterogeneous capture probabilities, and show that, depending on the network load, the capture effect...
In practical WLAN deployments, the capture effect has been shown to enhance the performance of stations residing close to the AP, while putting at disadvantage the distant nodes. In this paper, we introduce an analytical model to characterise the performance of 802.11 devices with hetero- geneous capture probabilities and different network loads, and explore the interaction between the MAC operation...
As real-time multi-player games are increasingly popular network applications nowadays and 802.11 wireless are widely used, it is common that games are played over 802.11 networks. However, game performance can be degraded when competing with background traffic. In this paper, we propose Application Divided Resource Allocation (ADRA) scheme based on 802.11e to support games in a mixed traffic 802...
Real-time multiplayer games are a popular application of networks, and as IEEE 802.11 wireless networks are widely used, games are expected to be widely played on wireless networks. However, 802.11 networks with the normal MAC (DCF) may present some challenges when supporting real-time games traffic. In this work, we present a theoretical model which can predict the performance and capacity of 802...
Irregular LDPC codes can have capacity-approaching performance with an iterative BP decoder under AWGN channel with BPSK modulation. Generally in BPSK modulation, every bit within the block has the same power. In this paper, we investigate unequal power allocation (UPA) using BPSK modulation for irregular binary LDPC codes. We show that constant power modulation need not lead to the best performance...
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