Probabilistic learning on manifolds (PLoM) with partition

The probabilistic learning on manifolds (PLoM) introduced in 2016 has solved difficult supervised problems for the “small data” limit where the number N of points in the training set is small. Many extensions have since been proposed, making it possible to deal with increasingly complex cases. However, the performance limit has been observed and explained for applications for which N is very small and for which the dimension of the diffusion-map basis is close to N. For these cases, we propose a novel extension based on the introduction of a partition in independent random vectors. We take advantage of this development to present improvements of the PLoM such as a simplified algorithm for constructing the diffusion-map basis and a new mathematical result for quantifying the concentration of the probability measure in terms of a probability upper bound. The analysis of the efficiency of this extension is presented through two applications.     

福祉设计视野下的老年生活辅具设计研究

目的以老龄化为背景,从福祉设计视野出发,通过对老年生活辅具设计研究,推动实现老年人独立自主参与社会活动来提升其福祉。方法以60岁以上、可生活自理的老年人为目标人群,采用访谈、现场观察等调研方式针对老年人的特殊需求进行梳理,结合文献及对经典设计的分析,总结老年生活辅具设计方法,并以后疫情下的地摊经济现象为例,进行多功能手推车的设计实证。结果提出福祉设计视野下老年生活辅具设计方法,设计出老年人多功能手推车方案。结论通过对老年生活辅具的设计,可以推动老年人独立自主参与社会活动进而提升其福祉;生活辅具设计应以老年人的生理、心理及行为特征为依归,结合产品设计规律,提出针对性的解决方案;老年手推车的设计可以帮助老年人在后疫情语境下独立自主地参与社会活动。     

煤层深孔注水技术在平禹一矿的研究与应用

介绍了平煤集团平禹煤电公司一矿13110工作面煤层注水方式选择和注水技术参数的确定方法，针对平禹一矿13110采面回采过程中煤尘较大的问题，研究合理的煤层深孔注水参数，达到最优注水效果。研究确定了深孔注水成熟的技术装备；总结形成了独特的煤层注水考核管理模式，应用效果较好。     

大类招生背景下电子信息类专业人才培养模式的探索与思考

“大类招生、分流培养”已成为大多数高校采取的招生和培养思路，如何确定大类招生包含的专业、合理制定分流原则、制定科学的课程体系、完善相关的配套制度，不仅关系高校招生生源质量，而且影响高校人才培养质量。本文以北京交通大学电子信息工程学院为例，详细阐述了电子信息类专业人才培养模式的探索和思考。     

Study of golden pompano (Trachinotus ovatus) freshness forecasting method by utilising Vis/NIR spectroscopy combined with electronic nose

Golden pompano (Trachinotus ovatus) quality forecasting method utilising Vis/NIR spectroscopy combined with electronic nose (EN) was investigated in this article. Responses of Vis/NIR spectroscopy and EN to pompanos stored at 4°C were measured for 6 days. Physical/chemical indexes including texture, total volatile basic nitrogen, pH, total viable counts, and human sensory evaluation were synchronously examined as quality references. Chemometric methods including principal component analysis (PCA) and stochastic resonance (SR) were employed for spectroscopic and EN data analysis. Physicochemical examination demonstrated that fish quality decreased rapidly during storage. PCA qualitatively classified freshness degree of pompano samples, while SR signal-to-noise ratio (SNR) spectrum using SNR maximum quantitatively characterised quality for all samples. Golden pompano quality predictive models were developed based on spectroscopy, EN, and spectroscopy combined with EN, respectively. Results demonstrated that the model developed based on spectroscopy combined with EN presented a forecasting accuracy of 93.3%.     

食品微生物检验用培养基的使用及质量控制探讨

培养基自身质量的优劣、保存是否得当、配制使用是否正确都直接影响食品微生物检验结果的准确性。因此,加强培养基的质量控制和关注使用过程中的注意事项是保证检验准确性的关键。本文结合相关文献研究及笔者多年工作实践经验,对食品微生物检验用培养基在使用中的注意事项及质量控制措施进行了探讨,以供广大同行参考。实验室需结合工作实际选择合适的培养基质控标准、制定相应的质量控制作业指导书,对培养基进行理化指标和微生物指标的质量验收。此外,还要注意对培养基配制用水、生化鉴定试剂盒以及血清进行质量控制。实验室在使用培养基时要选择适宜的制备方法、灭菌方式、储存方式等,并按照标准要求进行质量控制,以保证最终检验结果的准确性。     

VFP与EXCEL在招生录取工作中的灵活运用

面对复杂的招生录取工作,熟练地使用计算机技术,能够达到事半功倍的效果.本文讨论灵活运用VFP和EXCEL技术,利用VFP和EXCEL各自处理数据的特点,高效完成招生录取工作.     

Effect of hydrogen in advanced high strength steel materials

The effect of hydrogen in AHSS material (automobile and structural component) was discussed. Dual Phase steels were highly susceptible to hydrogen-related failure when working on hydrogen environment. The influence of hydrogen on TRIP steel was seen during fractographic examination where the brittle transgranular fracture was presented. TWIP steels results were inconsistent. The mechanisms which were responsible for crack growth are discussed. LIST and SSRT testing were performed for mechanical properties evaluation and SEM and TEM were used for microstructural examination of fractured samples. Simultaneous preventing methods to reduce hydrogen embrittlement such as coating, alloying and providing diffusion layer were discussed.     

略论建设工程质量检测行业与国际接轨

根据我国检测单位现状、特点,阐述我国检测行业与国际接轨是大趋势,作为整个行业来讲面对的不仅仅是业内日益激烈的竞争,更应清醒的认识到来自国外同行的竞争,在体制上应尽快与国际先进检测机构接轨,这样才能在日趋激烈的国际竞争中赢得先机。     

激光散斑干涉技术的应用

散斑干涉计量就是根据与物体变形有内在联系的散斑图，将物体表面位移或变形测量出来。介绍了激光散斑干涉技术的物理学基础、检测方法及其应用。说明它是一种非常便捷、先进、并具有发展潜力的光测技术。