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971.
972.
光学防抖制品弹片组料带手动清洗作业效率低下,同时因人工清洗引起的弹片变形、部品刮伤、清洗效果不佳造成产品品质不稳定的问题多发,为此专门设计了光学防抖制品弹片组料带自动清洗设备.结合现阶段的先进工业技术,采用步进电机同步受控进料,多机构并联PLC及人机界面触摸屏,研发了此光学防抖制品弹片组料带自动清洗设备,实现了光学防抖制品自动清洗作业,减少了质量问题和企业成本,提升了生产效率. 相似文献
973.
Fei Wang Xiaofeng Liao Songtao Guo Hongyu Huang Tingwen Huang 《Wireless Personal Communications》2013,70(1):435-457
In this paper, we focus on the problem of dynamic rate and power allocation in wireless ad hoc networks with slow-fading channels, where a mixture of elastic and inelastic traffic is supported. A stochastic optimization problem incorporating the quality of service requirements of the two types of traffic is formulated, which aims to maximize the network performance by allocating the power for each link and controlling the service rates of all flows in the network. Since the utility functions of inelastic flows may be non-concave, which are difficult to be readily transformed to be concave, the proposed original problem is non-convex. However, despite the existing difficulty, a dynamic rate and power allocation algorithm (named DRPAA), is proposed to solve the original optimization problem. In DRPAA, both the stochastic duality theory and the particle swarm optimization approach are used, and this dynamic algorithm provides a good approximation to the optimal solution when the variation of the channel condition of each link gets larger. By using DRPAA, flow rates and link powers are dynamically allocated in each network state without the need for the distribution of the network states. Simulation results show that DRPAA has a good convergence speed and can efficiently utilize network resources to improve the network performance. 相似文献
974.
城市绿线控制规划编制探讨——以龙岩市中心城区绿线控制规划为例 总被引:1,自引:0,他引:1
结合龙岩市中心城区绿线控制规划实践,借鉴城市规划设计的理念和手段,从城市绿地系统规划、控制性详细规划的层面探讨城市绿线控制规划编制的思路、方法并剖析编制误区。 相似文献
975.
976.
Microfluidic Templated Multicompartment Microgels for 3D Encapsulation and Pairing of Single Cells 下载免费PDF全文
Liyuan Zhang Kaiwen Chen Haoyue Zhang Bo Pang Chang‐Hyung Choi Angelo S. Mao Hongbing Liao Stefanie Utech David J. Mooney Huanan Wang David A. Weitz 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(9)
Controlled encapsulation and pairing of single cells within a confined 3D matrix can enable the replication of the highly ordered cellular structure of human tissues. Microgels with independently controlled compartments that can encapsulate cells within separately confined hydrogel matrices would provide precise control over the route of pairing single cells. Here, a one‐step microfluidic method is presented to generate monodisperse multicompartment microgels that can be used as a 3D matrix to pair single cells in a highly biocompatible manner. A method is presented to induce microgels formation on chip, followed by direct extraction of the microgels from oil phase, thereby avoiding prolonged exposure of the microgels to the oil. It is further demonstrated that by entrapping stem cells with niche cells within separate but adjacent compartments of the microgels, it can create complex stem cell niche microenvironments in a controlled manner, which can serve as a useful tool for the study of cell–cell interactions. This microfluidic technique represents a significant step toward high‐throughput single cells encapsulation and pairing for the study of intercellular communications at single cell level, which is of significant importance for cell biology, stem cell therapy, and tissue engineering. 相似文献
977.
978.
介绍了开发的全数字交流伺服系统的组成、基本原理及软、硬件结构。通过与模拟交流伺服系统的比较,说明了全数字交流伺服系统可编程能力强、系统稳定性好、系统性能提高等特点。 相似文献
979.
Qiwen Yong Bing Liao Guo Ying Liang Caizhen Hao Huang Hao Pang 《Journal of Coatings Technology and Research》2018,15(5):993-1002
This paper reports on a novel self-matte or bulk-matte waterborne polyurethane coating composite with inherently extremely low gloss. The coating composite was comprised of a siloxane-containing waterborne polyurethane (SPU) resin and a crosslinked waterborne polyurethane (CPU) resin. The CPU resin was mainly responsible for fabricating the micro-rough surface of the film, which was achieved by a crosslinking reaction between the waterborne polyurethane and bisphenol A-type epoxy E-44 resin. The SPU resin was used to improve the comprehensive properties of the film, which was ascribed to the addition of silane coupling agent KH792. Compared with traditional matte coatings, this coating composite made it possible to avoid high loadings of matting agent and to arrive at highly flexible low-gloss finishes. Gloss levels of as low as a few tenths of a percent, even at high incidence angles, have been achieved with zero loading of extraneous dulling agent. The chemical structures of the SPU and CPU resins were characterized by FTIR-ATR and NMR spectra. The micro-rough topographies and surface rough degrees of the SPU, CPU and their 50%/50% composite films were measured by SEM and MSP, respectively. The particle sizes and particle morphologies of the SPU and CPU resins were imaged by TEM. Finally, the comprehensive properties of the SPU, CPU and their 50%/50% composite resins were evaluated, including the water contact angle, film transparency, tensile strength and storage stability. 相似文献
980.