基于FPGA的数字跑表设计

Verilog程序通过综合、适配后形成配置文件,下载到FPGA器件中对FPGA进行配置,使FPGA成为实用的测频模块。通过波形仿真,符合本次设计的要求。最后,通过完整编译后的文件固化到开发板,接上高频信号源,实现了数字跑表的设计。本文详细介绍了数字跑表的设计指标,设计思路,设计方案,系统的电路设计,系统相应模块设计,系统硬件实现与测试结果。     

Collaborative filtering recommendation algorithm based on rough set rule extraction

To address the problem that in a practical recommendation system (RS),because of the datasets are often very sparse,the traditional collaborative filtering (CF) approach cannot provide recommendations with higher quality,a novel CF based on rough set rule extraction was proposed.Firstly,the attributes of user/item and the user-item rating matrix were used to construct a decision table.Then,the core value of each rule in the table was extracted through using the decision table reduction algorithm.Finally,according to the nuclear value decision rule of the core value table,the reductions of all decision rules were utilized to predict the rating scores of un-rated items.Experimental results suggest that the proposed approach can alleviate the data sparsity problem of CF,and provide recommendations with higher accuracy.     

一种智能环卫服的设计研究

目的基于环卫工人多维度的需求和太阳能资源的利用,设计安全兼具实用、功能完备的智能环卫服。方法因柔性非晶硅薄膜太阳能板吸收并将太阳能转化为电能,转存到锂电池为设备供电,同时以可拆卸的形式与服装结合,便于洗涤;微型轻便USB风扇通过纽扣开关的调节可使微型风扇多角度的活动,另一个纽扣开关控制的多功能USB插口可自主为无线电呼机、手机等设备充电,为环卫工提供生理安全、便利通讯和娱乐性;NFC芯片载有环卫工的具体信息,优化考勤工作。结论智能环卫服的设计研究对环卫智能化、一体化建设具有重要意义,同时也对从事安全服装设计的人员提供一个理论性的参考研究。     

STEAM背景下小学3D打印课程教学设计模式构建研究

培养具有创造性思维的创新性人才是教育新时代的新使命,以3D打印课程为寄托融入STEAM教育理念是培养创新性人才的有效途径。论文以提升小学生的创造性思维为出发点,针对我国STEAM教育教学发展的客观实际提出了小学3D打印课程的全新教学模式。该模式提出了课内学科融合和课外在线互动两个教学环节。其中,课内学科融合中设计了提问引入、分析自学、创造生成、交流反馈四个课堂环节,旨在进行指引、激发、组织思考和反思的教学活动;课外在线互动设计了分享微课资源、展示作品成果、答疑评价四个学习环节,旨在查缺补漏与巩固提高。最后以小学信息技术课程《我的糖果屋》为案例开展教学实践,以期为3D打印课程的实践与研究提供参考,探索培养学生的创造性思维的教学方法,从而助力推动教育改革。     

基于微信小程序的移动学习活动教学模式构建研究

微信自创建以来迅猛发展,微信小程序的到来更是给各行各业提供了发展的平台,教育领域也不例外。随着“5G”时代的到来,利用微信小程序进行移动学习已经成为当下重要的学习方式之一。本文在对微信小程序的优点进行阐述的基础上,从需求分析、实施过程、评价反馈三部分构建了基于微信小程序的移动学习活动教学模式,以教育技术学大一学生必修课程《数字音频技术》课程为例,基于“即速应用”平台开发《数字音频技术课程导学》课程并应用于实践中,为高校开展移动学习活动提供了新的契机,以期为基于微信小程序的移动学习的发展提供一定的参考。     

基于GA-BP算法的超声波测量精度优化研究

针对复杂环境下超声波传感器测量系统测量精度问题,以罐体油位测量为例,提出一种基于神经网络遗传算法的超声波传感器测量精度优化模型,实现超声波油位测量系统的非线性误差校正。仿真结果表明,该方法可以减小超声波传感器本身结构和外界因素的干扰,提高测量精度。     

Enhanced formation of magnesium silica hydrates (M-S-H) using sodium metasilicate and caustic magnesia in magnesia castables

Magnesium-silica-hydrates (M-S-H) is a promising binder for magnesia castables due to its bonding strength and progressive dehydration behavior over a wide temperature range during the heating-up stage. Sodium metasilicate and caustic magnesia were used to form M-S-H in magnesia castables. The results showed that M-S-H was remarkably produced in the caustic magnesia-microsilica slurries containing sodium metasilicate with increasing pH value, which activated the hydrolysis of microsilica into silicic ions and enhanced the M-S-H formation. When 0.3 wt% caustic magnesia and 0.05 wt% sodium metasilicate as additives were incorporated into magnesia castables, the cold crushing strength and cold modulus of rupture of castables after drying at 110 °C reached the maximum value of 68.3 MPa, which corresponded to ~ 40% improvement in comparison with those of caustic magnesia and sodium metasilicate-free magnesia castables. Besides, the enhanced formation of M-S-H bonding system contributed to a better explosion resistance of magnesia castables.     

Analysis of microseismic activity in rock mass controlled by fault in deep metal mine

Aiming at evaluating the stability of a rock mass near a fault,a microseismic(MS) monitoring system was established in Hongtoushan copper mine.The distribution of displacement and log(/),the relationship between MS activity and the exploitation process,and the stability of the rock mass controlled by a fault were studied.The results obtained from microseismic data showed that MS events were mainly concentrated al the footwall of the fault.When the distance to the fault exceeded 20 m,the rock mass reached a relatively stable state.MS activity is closely related to the mining process.Under the strong disturbance from blasting,the initiation and propagation of cracks is much faster.MS activity belongs in the category of aftershocks after large scale excavation.The displacement and log(C/) obtained from MS events can reflect the difference in physical and mechanical behavior of different areas within the rock mass,which is useful in judging the integrity and degradation of the rock mass.     

污泥发酵液对A2O脱氮除磷和微生物的影响

为研究剩余污泥发酵液作碳源对微生物群落结构的影响,将发酵液与市政污水按流量比1∶35回用于厌氧-缺氧-好氧反应器,在室温下运行90 d．聚类分析表明,发酵液明显改变了微生物群落结构,5~30 d和45~90 d的微生物属于不同的聚集区; 微生物多样性分析表明,发酵液使Shannon-Wiener指数从2.6升高到3.1,系统运行稳定性增强; PCR-DGGE分析表明,发酵液对微生物群落具有一定的选择性,氨氧化菌Nitrosomonas sp.、硝化菌Betaproteobacteria和 Nitrospira sp.、反硝化菌Comamonas sp.和聚磷菌Gammaproteobacteria得到富集,TN和TP去除率从64.5％和52.4％提高到84.7％和94.3％．     

基于企业职业技术人才评价研究与应用

通过对石化企业职业技术人才评价体系的分析,提出多种评价方法综合应用的评价思想。以模糊综合评价法和密切值法的转化和应用为例,研究如何有效利用不同评价方法,获得全面评价结果,达到评价信息对石化企业职业技术人才发展的全面推动和促进。同时,提出专家经验法和秩和比法的结合分析指标权重的确定,加强评价结果的科学客观性。最后,以锦州石化公司职业技术人才评价为例,说明这两种方法在人才评价中的转化和应用。