心理声学基本理论及其在声音品质主观评价中的应用

介绍了心理声学中的基本理论，主要论及了掩蔽效应、临界频带等基本概念和响度、尖锐度、粗糙度、波动度等心理声学参数，最后介绍了满意度和骚扰度系数在声音品质主观评价中的应用。     

施用沼肥对设施土壤固氮菌影响的研究

以有机质含量相同的猪粪、沼渣为基肥,以N,P,K含量相同的化肥与沼液为追肥,以L402番茄为供试作物,采用二裂式区组设计的方法.研究了沼肥、猪粪、化肥等不同施肥组合对设施土壤固氮菌动态变化的影响.试验结果表明:随着番茄生育期的推进,各施肥处理土壤自生固氮菌的数量逐渐增加,基施沼渣比基施猪粪有利于促进土壤自生固氮菌的生长;从番茄苗期到成熟期,追施化肥土壤自生固氮菌数量多于追施沼液土壤,猪粪与化肥配合施用、沼渣与沼液配合施用分别较猪粪与沼液配合施用、沼渣与化肥配合施用能更好地促进土壤自生同氮菌的繁殖.     

无心感应熔铜、铝炉用耐火材料

介绍了熔炼铜、铝及其各自合金的无心感应炉用新型干式成型耐火材料的研制、性能和使用情况。该材料成本低,成型工艺简便,使用寿命长。     

RENEWABLE ENERGIES AND ENERGY CONSERVATION TECHNOLOGIES FOR BUILDINGS IN SOUTHERN EUROPE

The characteristics of the building's energy consumption in Southern Europe are analysed. The energy potential of solar energy for heating and lighting purposes as well as the potential of passive cooling techniques are investigated. The ecological impact of the energy saving technologies as well as the market opportunities of the alternative technologies are discussed.     

Life cycle assessment of power generation alternatives for a stand-alone mobile house

This paper presents comparative life cycle assessment of nine different hybrid power generation solutions that meet the energy demand of a prototypical mobile home. In these nine solutions, photovoltaic panels and a wind turbine are used as the main energy source. Fuel cell and diesel generator are utilized as backup systems. Batteries, compressed H₂, and H₂ in metal hydrides are employed as backup energy storage. The findings of the study shows that renewable energy sources, although they are carbon-free, are not as environmentally friendly as may generally be thought. The comparative findings of this study indicate that a hybrid system with a wind turbine as a main power source and a diesel engine as backup power system is the most environmentally sound solution among the alternatives.     

环境法规及其影响——国际海事组织和欧盟的相关议题

详细介绍了国际海事组织和欧盟关于环境法规的相关议题-压载水、空气污染等法规。对压载水管理公约的有关内容以及公约生效后船舶行业面临的机会和挑战作了分析。并探讨了IMO和EU关于SOx／NOx／CO2等的法规限值以及可能的解决方案。     

Drivers and barriers for the large-scale adoption of hydrogen fuel cells by Nordic shipping companies

The shipping industry needs to transition towards new fuels and technologies to reduce its environmental impact. A promising option is using hydrogen fuel cells. However, the technology is relatively new and not commercially available at a large scale. This study focuses on the Nordic shipping industry where the first commercial vessels are expected to be launched. Interviews were conducted with high-level managers to identify the factors that influence the adoption of hydrogen fuel cells. Sixteen factors are identified as motivating the decision and are categorized as internal, connecting, and external drivers. The most relevant are environmental commitments, customer expectations, and policies and regulations. Eleven factors are identified as limiting the decision and are categorized as behavioral, economic, organizational, and technological barriers. The most significant are high costs, lack of infrastructure, and operational challenges. The drivers and barriers are categorized as company-specific, industry-specific, and technology-specific.     

Hydrogen production from agricultural waste by dark fermentation: A review

The degradation of the natural environment and the energy crisis are two vital issues for sustainable development worldwide. Hydrogen is considered as one of the most promising candidates as a substitute for fossil fuels. In this context, biological processes are considered as the most environmentally friendly alternatives for satisfying future hydrogen demands. In particular, biohydrogen production from agricultural waste is very advantageous since agri-wastes are abundant, cheap, renewable and highly biodegradable. Considering that such wastes are complex substrates and can be degraded biologically by complex microbial ecosystems, the present paper focuses on dark fermentation as a key technology for producing hydrogen from crop residues, livestock waste and food waste. In this review, recent findings on biohydrogen production from agricultural wastes by dark fermentation are reported. Key operational parameters such as pH, partial pressure, temperature and microbial actors are discussed to facilitate further research in this domain.     

Efficiency increase of an induction motor by improving coolingperformance

Improving the efficiency of induction motors, which are the most energy consuming electric machines in the world, saves much energy. The efficiency can be increased by improving cooling performance as well as by using better materials or by improving electromagnetic performance with better design. This paper presents the relationship between the efficiency or the losses and the temperature of coils with experiments as well as simulations by changing parameters such as the load and the flow rate of cooling air. The losses and the efficiency are calculated from an equivalent circuit method as well as experiments. Coil temperatures variation affects much on the efficiency. The internal cooling method is better than that of external cooling for the coil temperature reduction. Several cooling methods are compared focusing on the fan efficiency and performance, from which the values of the efficiencies of the motors are expected. The fan efficiency as well as the fan performance should be considered for the optimum fan design to increase the total efficiency of a motor. The simulations are validated by the comparison with the experiments     

FFDJ－B便携式风力发电机检测系统

讨论了风力发电机检测原理及检测系统功能结构，非工频、非正弦波信号检测方法及运用时域分仓法的软件结构。