大学计算机专业基于网络的交互式平台设计与实现

文章针对困扰教师的课堂出勤统计、学生知识点掌握程度、学生综合评价和历届学生综合能力比较等难题,通过搭建基于网络的交互式教学辅助平台,从不同角度对数据进行分析统计和可视化展示。该平台对教师及时掌握学生状况,进而进行教学方法的改进和培养学生学习兴趣起到重要的作用,将会成为教师课堂教学的有力助手。     

大数据在空调领域的应用

本文阐述了传统空调数据的主要来源,从空调研发等几个方面分析了传统空调数据的用途;围绕空调产品和空调企业,梳理了空调领域大数据的产生原因及来源;空调大数据的多度量性、多维度性、地域性等特点对数据挖掘提出了挑战;探讨了大数据在空调领域的应用,重点分析了大数据在空调系统优化、故障诊断、建筑能耗与维护预测、企业人力资源和资金分配、企业提供个性化定制服务等方面的用途;通过挖掘海量空调数据可以预测用户行为,表明空调领域大数据安全防护应当得到重视。     

GPT超前地质预报技术在马留山隧道中的应用

隧道超前地质预报对于预测围岩情况、指导隧道施工有着重要意义。本文介绍了GPT技术的原理和在国内外应用的现状,结合马留山隧道的地质超前预报,分析论证了GPT超前地质预报系统在隧道超前地质预报中应用的有效性,得出了马留山隧道左线ZK50＋735～ZK50＋935区段200m范围内的围岩属于中强风化砂岩,局部有渗水,稳定性和完整性稍差,属于IV级围岩,说明了GPT超前地质预报技术是保证隧道施工顺利安全施工的重要地质预报手段,展示出该系统在隧道施工中的广阔应用前景。     

采煤工作面局部风流雾化降温效果分析

为分析低温雾化喷淋对高温采煤工作面局部风流的降温效果,采用Eulerian-Lagrangian二相流描述方法,通过液滴与湿空气的双向耦合作用,对高温风流的降温效果进行了数值计算,计算结果表明：1次降温后,风流温度约有4℃的急剧降低,1排喷嘴的有效作用距离为10 m,10 m后,风流温度又逐渐升高1.5℃,总体上,回采面风流的温度呈现出阶跃性的上升趋势;拟合得到的风流降温效果随喷嘴流量呈负指数变化;液滴喷射角在70°~90°范围时,降温效果较明显,而细水雾的高压雾化喷嘴能明显提高降温效果。     

海底用耐腐蚀管线钢X60MOS的开发

随着油气行业的发展,亟需研发一种成本低、海底用、抗酸、综合性能优良的管线钢。参照API SPEC 5L标准,结合抗酸管线钢和海底管线钢的具体指标要求,以热模拟试验为指导,在管线钢生产基础上,通过采用低C、低Mn、低S的化学成分设计;采用连铸凝固末端压下技术;借助X60MOS钢高温应力应变曲线及CCT曲线,制定了合理的加热、轧制及冷却工艺制度,开发出晶粒细小、组织均匀,强韧性匹配优异、综合性能优良的海底用耐腐蚀管线钢X60MOS。     

Ultrathin Highly Luminescent Two‐Monolayer Colloidal CdSe Nanoplatelets

Surface effects in atomically flat colloidal CdSe nanoplatelets (NLPs) are significantly and increasingly important with their thickness being reduced to subnanometer level, generating strong surface related deep trap photoluminescence emission alongside the bandedge emission. Herein, colloidal synthesis of highly luminescent two‐monolayer (2ML) CdSe NPLs and a systematic investigation of carrier dynamics in these NPLs exhibiting broad photoluminescence emission covering the visible region with quantum yields reaching 90% in solution and 85% in a polymer matrix is shown. The astonishingly efficient Stokes‐shifted broadband photoluminescence (PL) emission with a lifetime of ≈100 ns and the extremely short PL lifetime of around 0.16 ns at the bandedge signify the participation of radiative midgap surface centers in the recombination process associated with the underpassivated Se sites. Also, a proof‐of‐concept hybrid LED employing 2ML CdSe NPLs is developed as color converters, which exhibits luminous efficacy reaching 300 lm W_opt^?1. The intrinsic absorption of the 2ML CdSe NPLs (≈2.15 × 10⁶ cm^?1) reported in this study is significantly larger than that of CdSe quantum dots (≈2.8 × 10⁵ cm^?1) at their first exciton signifying the presence of giant oscillator strength and hence making them favorable candidates for next‐generation light‐emitting and light‐harvesting applications.     

基于三维集成的红外焦平面阵列技术

随着像素单元越来越小、阵列规模越来越大、帧频越来越快,传统的IRFPA面临很大的集成技术发展瓶颈。基于三维集成的红外焦平面阵列(3D-IRFPA)通过堆叠芯片集成了A/D转换器、数字信号处理器、存储器等模块,可突破像元面积、阵列规模、帧频等瓶颈,实现探测器更强大的功能和更高的性能。本文介绍了3D-IRFPA技术的结构原理、优势、面临的挑战,以及最新技术进展。     

长直SiO_2纳米线的制备和结构表征

采用磁控溅射法,以Si粉和溅金Si(111)为原料,加入C粉,在Si(111)衬底上制备无定形SiO2纳米线。首先,在Si(111)衬底上分别溅射厚度为18和36 nm的Au。然后,在1 100℃条件下处理80 min。用扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、傅里叶红外光谱(FTIR)和X射线衍射方法 (XRD)等测试手段对退火后的SiO2纳米线的表面相貌、微观结构进行分析。结果表明,反应后有大量长而直的SiO2纳米线生成。而且随着溅射Au厚度的增加,SiO2纳米线的数量增多,且长度更长。这表明,SiO2纳米线的生长与溅射Au的厚度密切相关。     

Monitoring of the bacterial communities of bamboo shoots (Dendrocalamus latiflorus) during pickling process

The diversity and dynamics of the dominant bacterial communities arising during the pickling process of bamboo shoots (Dendrocalamus latiflorus) were investigated by nested polymerase chain reaction denaturing gradient gel electrophoresis combined with quantitative real‐time polymerase chain reaction. Results showed only several kinds of halophilic bacteria during early sampling time (0?3 days). After pickling for 7 days, Lactococcus lactis significantly increased (P < 0.05, quantities were 6.39 × 10⁵ copies μL^?1) and became the first dominant bacterium. After pickling for 14 days, Weissella sp. bands appeared and quickly became dominant on the 21st day (4.07 × 10⁶ copies μL^?1). As maturation progressed, Lc. lactis decreased in intensity whereas Weissella sp. increased in intensity. Finally, the quantities of Weissella sp. (2.50 × 10⁷ copies μL^?1) became higher than those of Lc. lactis (1.43 × 10⁷ copies μL^?1) after pickling for 56 days. The pickling process was initiated by Lc. lactis, followed by Lc. lactis and Weissella sp., and was finally succeeded by Weissella sp.     

Midas/civil在刚接空心板梁桥计算中的应用

目前我国中小桥设计,特别是20m跨径以下的中小桥,主要采用铰接空心板梁,但铰缝的危害也逐渐显现出来,而刚接空心板将很好的解决这一问题。刚接空心板计算方法有多种,本文选择考虑横向分布的单梁模型以及考虑斜弯效应的空间模型,并比较不同计算方法的差异,从而给出不同计算方法的计算特点及适用条件。相关设计方法可为同类型桥梁设计提供参考。