民族高校如何通过大型学科竞赛平台提升学生能力——以中国大学生方程式汽车大赛为例

针对学生能力培养过程具有复杂性、渐进性和长期性的特点,提出利用大型学科竞赛平台提升学生能力的方案。结合大型学科竞赛具有实施周期长、综合性强以及内容复杂等特点,利用整个活动过程中的多种动机强化手段和多个迁移机会,使学生能够全程积极参与到竞赛过程中。民族高校可利用此类理想的训练平台提升学生能力。     

壳聚糖—纳米金自组装葡萄糖生物传感器的研究

利用壳聚糖与纳米金构建一种新型的葡萄糖生物传感器。探究不同浓度的葡萄糖溶液、p H及温度对传感器响应电流的影响。结果表明,此传感器在温度为35.0℃,p H=7.00,葡萄糖质量浓度为0.018~25.7 mg/L范围内有良好的线性,线性I=4.135 6 m+91.787μA,R2=0.997 9,检出限为0.001 2 mg/L。该传感器具有制备简单、方法简便、灵敏度高,能快速检测等优点。     

汽车安全带产品质量现状的分析研究

随着汽车碰撞安全性能要求的不断提高,整个社会对安全带产品的质量和性能日益重视。阐述了国内安全带产品的市场情况,以两次安全带国家抽查的试验结果为依据,对各检测项目的试验数据分别进行统计分析,并与现行国家标准进行对比,查找并研究目前安全带产品存在的共性问题。结果显示,除两批次产品不合格外,市场上的安全带产品总体质量较好,且某些检测项目的试验数据要远优于标准限值,此研究对分析安全带产品的质量状况具有现实意义。     

整合多功能景观和生态系统服务的景观服务制图研究框架

生态系统和景观是地球表层系统的基本功能单元,其变化影响着景观和生态系统服务的供给.从当前国内外研究进展上看,结合多功能景观和生态系统服务的景观服务定量化研究还比较薄弱.本文从结合多功能景观和生态系统服务以及景观服务研究的角度出发,以景观服务制图作为切入点,通过对景观服务和生态系统服务以及多功能景观的综述,提出了一种景观服务制图的研究框架,旨在为区域景观服务评价以及可持续性科学研究提供参考和借鉴.     

论职业院校的教学文化变革

职业院校的教学文化变革是职业院校教学改革向纵深发展的内在要求.因此,我们一定要树立教学文化变革的开放意识,具备更加广阔的视野,对教学文化变革的内涵、价值和策略进行更加理性的审视,进而形成职业院校的教学品牌文化.     

COD测定废液中Ag2S04的回收循环利用研究

目的研究COD测定废液中Ag2SO4的回收和利用，实现资源的循环利用，提高利用效率，节约实验成本，减少环境污染。方法以COD测定废液为研究对象，将Ag2SO4通过NaCl转化为AgCl沉淀，再用Zn粒在酸性介质中进行还原，使AgCl转化为银粉；所得银粉在少量HN03存在的条件下，用浓H2S04氧化，将其转化为Ag2SO4，重新用于COD测定实验。结果通过一系列实验研究表明，有70％的银可以得到回收，所得Ag2SO4再次用于COD测定实验，标准样品的COD测定误差在许可范围之内；实际污水中COD的测定实验结果表明，Ag2SO4循环使用的测定误差平均为7．4％。结论实验证明回收的Ag2SO4可以作为COD测定实验的催化剂循环使用，可操作性良好，在节约实验成本的基础上，对于环境保护、减少污染物排放量方面有显著效果。但是COD测定结果的偏差较大，重现性有待进一步改进提高。     

A high-level synthesis based dual-module redundancy with multi-residue detection （DMR-MRD） fault-tolerant method for on-board processing satellite communication systems

On board processing （OBP） satellite systems have obtained more and more attentions in recent years because of their high efficiency and performance.However,the OBP transponders are very sensitive to the high energy particles in the space radiation environments.Single event upset （SEU） is one of the major radiation effects,which influences the satellite reliability greatly.Triple modular redundancy （TMR） is a classic and efficient method to mask SEUs.However,TMR uses three identical modules and a comparison logic,the circuit size becomes unacceptable,especially in the resource limited environments such as OBP systems.Considering that,a new SEU-tolerant method based on residue code and high-level synthesis （HLS） is proposed,and the new method is applied to FIR filters,which are typical structures in the OBP systems.The simulation results show that,for an applicable HLS scheduling scheme,area reduction can be reduced by 48.26％ compared to TMR,while fault missing rate is 0.15％.     

采用Sn中介层的覆Al薄膜硅片键合技术研究

研究采用Sn作为中间层键合覆盖Al薄膜的硅片。相对于Al-Al直接热压键合,该系统能提供低温、低压、快速的圆片级键合方案。采用直径为100 mm硅片,溅射一层500 nm厚度的Al层后,在N2气氛下进行450°C,30分钟退火,采用Ar等离子体清洗后,溅射一层500 nm厚度的Sn层。将硅片金属面紧贴在一起放入键合机中键合,在真空中进行。键合时间为3分钟条件下,得到平均剪切强度为9.9 MPa,随着键合时间增加,剪切强度显著降低。     

Detecting MoS2 and MoSe2 with optical contrast simulation

Optical imaging is a promising method to identify and locate 2D materials efficiently and non-invasively. By putting a 2D material on a substrate, the nanolayer will add to an optical path and create a contrast to the case when the nanolayer is absent. This optical contrast imaging can be used to identify the 2D material and its number of layers. To make the optical imaging process in the laboratories an effective tool, Fresnel Law as a model was used to simulate the optical imaging results of 2D materials(graphene, Mo S2 and MoSe_2) on top of different thickness of SiO_2 and Si wafer in the present investigation. The results provide the details of the optimal conditions(optimal light wavelength and optimal SiO_2 thickness) to identify and locate single to few 2D nanolayers, which can be used directly in laboratories. The optical contrasts of 1–5 layers of molybdenum disulfide(MoS_2) and molybdenum diselenide(MoSe_2) were simulated. To the best of our knowledge, it is the first time that the optical contrast results of MoSe_2 have been reported. In particular, this work highlights the sensitivity of the model on the accuracy of the refractive indices used. It is demonstrated that through computational modeling that optical contrast can allow effective determination of number of layers in few layer 2D materials.