物联网技术发展困境之研究

文章从科技哲学视角探析了物联网技术三位一体的内涵,在此基础上,总结了物联网技术在发展过程中面临的技术异化困境、通用目的技术困境和中等收入陷阱困境,最后就如何摆脱以上三大技术困境进行了思考,提出应当从主观意识上防止和消解物联网技术异化,从客观上认识物联网技术的连续性与阶段性统一发展,最终实现物联网技术的自由和谐发展的观点。     

Bicriteria scheduling of a material handling robot in an m-machine cell to minimize the energy consumption of the robot and the cycle time

This study considers a flowshop type production system consisting of m machines. A material handling robot transports the parts between the machines and loads and unloads the machines. We consider the sequencing of the robot moves and determining the speeds of these moves simultaneously. These decisions affect both the robot’s energy consumption and the production speed of the system. In this study, these two objectives are considered simultaneously. We propose a second order cone programming formulation to find Pareto efficient solutions. We also develop a heuristic algorithm that finds a set of approximate Pareto efficient solutions. The conic formulation can find robot schedules for small cells with less number of machines in reasonable computation times. Our heuristic algorithm can generate a large set of approximate Pareto efficient solutions in a very short computational time. Proposed solution approaches help the decision-maker to achieve the best trade-off between the throughput of a cell and the energy efficiency of a material handling robot.     

变薄拉伸工艺中凹模锥角的计算机模拟优化

在分析了变薄拉伸工艺应力性质的基础上 ,应用有限元模拟软件定量地分析了凹模锥角对拉伸工艺的影响 ,并给出了凹模锥角的合理范围 ,从而为优化模具设计 ,合理制定工艺提供了可靠的参考依据     

20CrNiMo牙轮牙爪锻造缺陷对力学性能的影响

KX-250三牙轮钻头上的牙轮牙爪可选用20CrNiMo钢锻造,但20CrNiMo牙轮牙爪在锻造过程中产生的缺陷严重影响产品的力学性能.为此对20CrNiMo牙轮牙爪进行质量跟踪,并对试样进行了力学性能的测试.结果表明：当锻造产生了白点和过热缺陷时,牙轮牙爪的力学性能明显下降,尤其是塑性指标和冲击韧度降低明显.为了防止这些缺陷的产生,还提出了一些对策,以提高牙轮牙爪的力学性能.     

Outdoor attractancy of males ofMatsucoccus josephi (Homoptera: Matsucoccidae) andElatophilus hebraicus (Hemiptera: Anthocoridae) to synthetic female sex pheromone ofMatsucoccus josephi

The active component of the sex pheromone ofMatsucoccus josephi is (2E,6E,8E)-5,7-dimethyl-2,6,8-decatrien-4-one; the chemical is also a powerful kairomone of adult males and females of the bugElatophilus hebraicus the principal predator ofM. josephi. The presence of theZ isomer (2E,6Z,8E)-5,7-dimethyl-2,6,8-decatrien-4-one does not interfere with the attractancy of the activeE component forM. josephi males or the bug. Our results show a clear dose-response between trap catch ofM. josephi males andE. hebraicus. Conversely, increasing amounts of theZ isomer in the mixture did not affect the attraction of the scale insect males or the bug. The catch ofM. josephi males did not differ significantly among traps of different color, and was significantly higher with traps attached to the tree trunk than those suspended between trees. Comparison of the catch ofM. josephi among the three forests and between pine species suggests that the level of infestation ofPinus halepepsis andPinus brutia ssp.brutia is similar, despite the fact that the latter pine is resistant to the scale insect. Both sexes ofE. hebraicus were trapped in much lower numbers at the more infested sites. This may be related to interference with the activity ofE. hebraicus due to deterioration and drying of parts of the tree crowns and heavy colonization by generalist predators in injured trees.     

气化炉锥底砖、激冷环与下降筒的损毁与解决对策

针对国产化大氮肥水煤浆气化炉中锥底砖、激冷环和下降筒使用过程中出现的问题,分析了损毁原因,分别从技术改进、工艺操作和设备管理等方面提出了相应的解决对策,可以不同程度地延长锥底砖、激冷环、下降筒的寿命。     

Reduction of NO2 stored in a commercial lean NO x trap at low temperatures

Isothermal storage of NO₂ and subsequent reduction with different reducing agents (H₂, CO or H₂ + CO) in a lean NO _x trap catalyst was tested by Temperature Programmed Desorption (TPD) and Temperature Programmed Reduction (TPR) experiments at temperatures representative of automotive “cold-start” conditions (<200 °C) using a commercial NO _x trap catalyst. Results from the TPR experiments revealed that no reduction of stored NO₂ to N₂ was observed at 100–180 °C, and at 200 °C 10% reduction only of NO₂ to N₂ was measured. A special affinity of H₂ to form NH₃ was observed during the reduction of stored NO₂. The formation of NH₃ increases with increasing amount of stored NO₂ and decreases with increasing storage temperature. Direct relation exists between the amount of adsorbed and/or stored NO₂ and the formation of H₂O and NH₃.     

一种单面涂铝PVC塑料吊顶材料燃烧性能的实验研究

采用锥形量热仪对市场上常见的一种内装修单面涂铝PVC吊顶材料的燃烧性能进行了实验研究。实验结果表明，在不同的辐射功率和不同暴露面下，该材料表现出不同的燃烧性能。当涂铝面(正面)暴露燃烧时，其质量损失速率(即燃烧速率)比未涂铝面(背面)小，正面的引燃时间比背面引燃时间长，这些特性对减小燃烧时的火焰蔓延速度有利；而正面暴露燃烧时的发烟量和一氧化碳的产率则比背面暴露燃烧时大，这一特性将增大材料燃烧时的烟气危害性。     

Marsh筒法量化评价水泥与减水剂流变学相容性的探讨

从流变学角度阐述了Marsh筒试验参数的物理意义,并提出用5min流动性能系数K1、λmin（λ〉5）流动性能系数K2、流动性能经时损失系数K3及流变学相容性指数α来定量评价水泥与减水剂相容性的优劣。     

焦炭煅烧回转窑技术参数的讨论和锥形回转窑的设计构思

通过对焦煅烧回窑的一些设计和运行参数的讨论，论述了锥形回转窑的设计及其使用的可行性和优越性。