APP软件性能效率研究

性能效率是APP软件的重要质量属性，但目前缺乏APP软件性能效率的通用模型。分析了APP软件的性能特征，基于ISO/IEC 25010标准提出了APP软件的性能效率模型，定义了APP软件性能效率的子特性和度量指标。基于提出的APP软件性能效率模型，通过实验对APP软件的性能效率进行了度量及相关分析。     

高功率光纤激光器光纤器件封装应力影响研究

高功率激光器无源器件制作过程中封装不当引入的应力,会导致信号光光束质量劣化和光纤温升,为了解决此问题,理论分析了光纤形变对信号光模式分布的影响,利用有限元方法建立包层光导致光纤发热模型,实验研究了不同封装方式对光纤发热情况和信号光光束质量的影响。实验表明,应力导致的光纤形变会造成信号光M2值在受力方向上略微变小而其垂直方向上变大,在输出100 W信号光时,施加应力导致的M2值的变化最高为0.39,与仿真结果相符。在光纤温升方面,相比于使用硬质胶水带来的12 ℃温升,使用硅橡胶封装的剥离器将温升控制在5 ℃以内,且其封装应力引入的M2值的变化在0.05以内。     

不同熄焦方式对40kg焦炉焦炭质量的影响

不同熄焦方式对焦炭的冷态强度、热态强度以及生产焦炉的工艺特点均有影响,为了更好地指导40 kg试验焦炉的生产,需对比分析水熄焦、干熄焦方式对焦炭质量的影响。选用4种不同炼焦煤和1种生产配合煤,利用40 kg级实验焦炉炼制焦炭,分别采用蒸汽熄焦与水熄焦方式对40 kg焦炉炼制的焦炭进行冷却,检测熄焦后焦炭的工业分析、机械强度及热性质等性能指标,对比分析2种熄焦方式对焦炭质量的影响,并研究2种熄焦方式下焦炭与生产干熄焦的焦炭质量关系。结果表明,相对水熄焦,蒸汽熄焦的焦炭水分较稳定(小于1%)、成焦率有所提升,改善了焦炭质量,其中1/3焦煤冷强度的改善最为明显,气煤与1/3焦煤的热性质改善最为明显,肥煤的成焦率提升最大;蒸汽熄焦与生产干熄焦的焦炭质量指标更接近,机械强度M 40一致、M 10数据高出2.5个百分点,热性质CRI数据高出8.1个百分点、CSR低出10.4个百分点。焦化企业可参照试验结果,进一步优化40 kg实验焦炉熄焦工艺及调整生产与试验焦炉的相关性。     

Facilitation of consumer loyalty toward branded applications: The dual-route perspective

Although many brands develop mobile applications (apps) to build relationships with consumers, most branded apps fail to retain consumers’ loyalty. This study examines the facilitation of consumer loyalty toward branded apps (continuance intention, in-app purchase intention, and word-of-mouth intention) from the dual-route perspective. One route is the affective (relationship) route, where brand benefits (functional benefits, experiential benefits, symbolic benefits, and monetary benefits) drive parasocial interactions between consumers and the brand, which, in turn, influences branded app loyalty. The other route is the utility route, where system characteristics (system quality and information quality) affect perceived usefulness, which, in turn, facilitates branded app loyalty. An online survey was conducted, and the research model was empirically tested using partial least squares structural equation modeling. The findings support the dual-route perspective according to which both affective and utilitarian paths facilitate branded app loyalty. The key theoretical contribution of this study is that it moves beyond the utilitarian path and finds the affective (relationship) path to give a more complete picture of the facilitation of consumer loyalty in the branded app context. A strategy is provided to suggest to practitioners how to design branded apps to facilitate consumer loyalty.     

不同水分工夫红茶贮藏过程中主要内含成分及感官品质变化研究

目的研究不同水分工夫红茶贮藏品质变化规律,为工夫红茶贮藏的适宜水分条件提供理论参考。方法系统比较不同水分工夫红茶(国家标准范围内)在自然贮藏条件下其主要内含成分及感官品质的变化。结果 1年贮藏期内,初始水分含量越低,含水率增长速度越快,总体上,茶叶初始水分含量高低决定贮藏过程中水分的高低。在短期贮藏(≤6月)时含水量越高的红茶中茶多酚、水浸出物保留量越多;长期贮藏(6月)时水分较低的红茶中茶多酚、水浸出物保留量越多。咖啡碱、可溶性糖在短期贮藏(≤6月)中水分含量适中的红茶中下降速度越慢;长期贮藏(6月)含水量较高的保留量越高。氨基酸含量在含水量越低的红茶中越高。初始水分含量高的红茶L*、a*、b*值均稍高于水分低的红茶。结论从综合品质的变化来看,本实验中以处理3含水率为5.93%的处理最好,处理2含水率为4.1%次之,处理1含水率为2.33%最差。     

Assessment of chemical and microbiological parameters of indoor swimming pool atmosphere using multiple comparisons

The aim of this study was to evaluate the air quality of an indoor swimming pool, analyzing diurnal and seasonal variations in microbiological counts and chemical parameters. The results indicated that yeast and bacteria counts, as well as carbon dioxide (CO₂), nitrogen oxides (NO_x) and O₃ concentrations, showed significant diurnal difference. On the other hand, temperature, relative humidity (R.H.), yeast counts and concentrations of CO₂, particles, O₃, toluene, and benzene showed seasonal differences. In addition, the relationship between indoor and outdoor air and the degree of correlation between the different parameters have been calculated, suggesting that CO₂, fine particles and NO_x would have indoor origin due to the human activity and secondary reactions favored by the chemical and environmental conditions of the swimming pool; while O₃, benzene and toluene, would come from outside, mainly. The overall results indicated that indoor air quality (IAQ) in the swimming pool building was deficient by the high levels of CO₂ and microorganisms, low temperatures, and high R.H., because frequently the limits established by the legislation were exceeded. This fact could be due to the poor ventilation and the inadequate operation of heating, ventilation, and air‐conditioning systems.     

Robust image retrieval by cascading a deep quality assessment network

The performance of computer vision algorithms can severely degrade in the presence of a variety of distortions. While image enhancement algorithms have evolved to optimize image quality as measured according to human visual perception, their relevance in maximizing the success of computer vision algorithms operating on the enhanced image has been much less investigated. We consider the problem of image enhancement to combat Gaussian noise and low resolution with respect to the specific application of image retrieval from a dataset. We define the notion of image quality as determined by the success of image retrieval and design a deep convolutional neural network (CNN) to predict this quality. This network is then cascaded with a deep CNN designed for image denoising or super resolution, allowing for optimization of the enhancement CNN to maximize retrieval performance. This framework allows us to couple enhancement to the retrieval problem. We also consider the problem of adapting image features for robust retrieval performance in the presence of distortions. We show through experiments on distorted images of the Oxford and Paris buildings datasets that our algorithms yield improved mean average precision when compared to using enhancement methods that are oblivious to the task of image retrieval. ¹     

某铅锌矿的三维地质模型及储量估算

针对矿山现有的地质信息数据等，建立了以利用Surpac软件的三维地表模型、矿体模型及地质数据库，对矿山资源储量进行计算。基于地质统计学的理论，建立某铅锌矿地表模型、钻孔数据库、矿体模型、块体模型，对矿体内样品进行组合分析统计，采用幂次距离反比法对块体品位进行估值，最后根据国内对地质矿产资源的分类方法，按照不同边界品位、工业品位等分类依据，得出资源储量核实报告，为铅锌矿的后续生产，提供了可靠保证。结果表明：通过构建该矿地质数据库，建立的三维模型，可对地质工程、采矿工程、储量估算、矿石品位动态管理等提供技术支持。     

基于ELM的英语教学质量评价研究

对英语教学质量实施科学化的评价关系到英语教学质量的提升,为减少主观因素的影响,本文提出一种ELM的教学质量评价方法,该种方法将可以在很大程度上提高教学质量评价的精度。对影响英语教学质量的12个指标进行打分,以此作为ELM的输入,同时将英语教学质量的综合得分作为ELM的输出。评价结果表明,基于EIM的英语教学质量评价结果比SVM、BP具有了很大程度的提升,为实施英语教学质量的评价提供了参考。