小型胶合板、细木工板企业如何生产达标产品

针对小型胶合板、细木工板生产企业的实际情况,从制造工艺技术方面提出具体要求与措施,以生产出质量符合国家标准要求的产品。     

26t全液压轮胎压路机行走系统的控制研究

主要针对26t全液压轮胎压路机行走系统的原理、行走系统的要求、调速控制原理、功率自适应功能等进行了分析,并得出了行驶速度、行驶制动、紧急制动等的控制方案,使轮胎压路机能够得到良好的动态响应曲线,并且能够平稳运行。     

The nutrient requirements of Lactobacillus acidophilus LA-5 and their application to fermented milk

Lactobacillus acidophilus LA-5 is a suitable probiotic for food application, but because of its slow growth in milk, an increase in its efficiency is desired. To shorten the time required for fermentation, the nutrient requirements of L. acidophilus LA-5 were analyzed, including the patterns of consumption of amino acids, purines, pyrimidines, vitamins, and metal ions. The nutrients required by L. acidophilus LA-5 were Asn, Asp, Cys, Leu, Met, riboflavin, guanine, uracil, and Mn²⁺, and when they were added to milk, the fermentation time of fermented milk prepared by L. acidophilus LA-5 alone was shortened by 9 h, with high viable cell counts that were maintained during storage of nutrient-supplemented fermented milk compared with the control. For fermented milk prepared by fermentation with Streptococcus thermophilus, Lactobacillus delbrueckii ssp. bulgaricus, and L. acidophilus LA-5, viable cell counts of L. acidophilus LA-5 increased 1.3-fold and were maintained during storage of nutrient-supplemented fermented milk compared with the control. Adding nutrients had no negative effect on the quality of the fermented milk. The results indicated that suitable nutrients enhanced the growth of L. acidophilus LA-5 and increased its viable cell counts in fermented milk prepared by L. acidophilus LA-5 alone and mixed starter culture, respectively.     

城市园林景观照明生态性控制研究

从城市生态系统出发,提出城市景观照明应考虑光生物安全性,对不当的照明对动植物的影响,光污染对城市环境的影响,生态照明的要求,城市照明的环保要求等进行了讨论。     

Automated Test Case Generation from Requirements: A Systematic Literature Review

Software testing is an important and cost intensive activity in software development. The major contribution in cost is due to test case generations. Requirement-based testing is an approach in which test cases are derivative from requirements without considering the implementation’s internal structure. Requirement-based testing includes functional and nonfunctional requirements. The objective of this study is to explore the approaches that generate test cases from requirements. A systematic literature review based on two research questions and extensive quality assessment criteria includes studies. The study identifies 30 primary studies from 410 studies spanned from 2000 to 2018. The review’s finding shows that 53% of journal papers, 42% of conference papers, and 5% of book chapters’ address requirements-based testing. Most of the studies use UML, activity, and use case diagrams for test case generation from requirements. One of the significant lessons learned is that most software testing errors are traced back to errors in natural language requirements. A substantial amount of work focuses on UML diagrams for test case generations, which cannot capture all the system’s developed attributes. Furthermore, there is a lack of UML-based models that can generate test cases from natural language requirements by refining them in context. Coverage criteria indicate how efficiently the testing has been performed 12.37% of studies use requirements coverage, 20% of studies cover path coverage, and 17% study basic coverage.     

浅谈隧道洞壁装饰板安装施工要点

本文针对隧道工程的特点,为保证隧道安全运营,阐述了合理选用及安装隧道洞壁装饰板的一些要点。     

浅析高速公路路面铣刨加铺技术的应用

阐述了高速公路路面铣刨处治原则,对原材料提出了其技术要求,进行了沥青混凝土的配合比试验和设计,确定了最佳油石比,并对路面铣刨加铺施工提出技术要求及注意事项,进而推广路面铣刨加铺技术的应用。     

A novel approach for capturing and evaluating dynamic consumer requirements in open design

In the product design, understanding consumer requirements (CRs) is essential due to the fact that it influences the success of the product. Currently, it has been recognized that consumer involvement in an open design (OD) environment is an effective way to reduce the gap between what is required by consumers and what companies can provide. In the process of OD, the initial CRs may shift as the consumers can influence each other, and it is a challenge to capture and evaluate dynamic CRs in OD. In this study, the dynamic relationship between consumers who participate in OD is discussed based on Nash equilibrium. Corresponding to the dynamic relationship, a novel approach is proposed to explore the crucial CRs from consumers’ perspective. Initially, the platform of OD is constructed on the Internet to collect the CRs and its evaluations. Thereafter, a similarity-based filtering method (SFM) is presented to filter out the most differentiated evaluations. Furthermore, to get the weight of the CR evaluated by consumers, an improved fuzzy Delphi method is introduced. Meanwhile, to solve the problem of excessive number of CRs, a dual-index evaluation method is put forward to control the opening degree of OD. Finally, to demonstrate the applicability of the suggested approach, a product of smartphone is examined as a case study. The results confirm that the proposed approach is appropriate for capturing and evaluating dynamic CRs in OD.     

广电网络光纤入户方案设计分析

伴随着我国经济社会的飞速发展和科学技术的不断进步,信息化程度越来越高,大家的生活和工作都离不开互联网技术,光纤入户是未来发展的必然走向。广电网络光纤入户,对相关工作的要求非常高,必须充分提升光纤入户方案的科学性、准确性和合理性,才能够保证相关工作的品质,使大家的生活变得越来越好。在充分研究实际光纤入户项目的基础上,深入研究广电网络光纤入户方案的设计要求。     

ENERGY QUANTIFICATION AND MECHANO-SORPTIVE BEHAVIOR IN THE KILN DRYING OF 2.5 cm THICK RED OAK LUMBER

ABSTRACT

Energy consumption was quantified in the drying of 2.5 cm thick red oak lumber in a 1.2 m³ steam heated experimental dry kiln. The aluminum pre-fab kiln is located indoors and was wrapped with 5 cm thick extruded polystyrene (R=10) for the experimental drying. Transmission loss accounted for about 80% of the energy/kilogram of water removed from the wood. The maximum value was for the 60°C DBT due to comparatively high transmission loss combined with maximum venting loss. Batch venting reduced average energy consumption per kiln run by over 6% compared to the conventional kiln schedule.

Average board shrinkage was over 2% less for drying with a low temperature schedule compared to drying by the conventional schedule for red oak. This was due to less compression set developing in the board interior at low wood temperatures, accompanied by more tension set in the surface layers. The mechano-sorptive results were in full agreement with McMillen's conclusions from his research on red oak.