以新发展理念引领高校专业基础课教学改革

以“创新、协调、绿色、开放、共享”为内核的新发展理念，是对马克思主义发展理念的继承和发扬，极具时代精神，富含问题意识，为高校思想政治教育发展、教育教学改革实践提供了强大的理论支撑。本文以“通信原理”为例，阐述了新发展理念在课程改革中的思路和方法，实现了思想政治教育与专业基础课程有机融合，为深化高校教学改革、创新人才培养模式提供了思路。     

A novel combustion fuel for the synthesis of nanocrystalline ZnAl2O4 particles based on the thermodynamic correlations and their structural and optical studies

ZnAl₂O₄ nanocrystalline particles were prepared using the solution combustion method using a new combustion fuel, Leucine. The prepared samples' structural, microstructural–elemental composition, and optical characteristics were investigated using XRD, SEM-EDS, and UV–Visible spectroscopy. As-synthesized ZnAl₂O₄ nanoparticles are polycrystalline, with no secondary phases, and crystallized in a cubic - spinel structure. The polycrystalline nature of the prepared sample is due to the exothermicity of fuel and oxidizer, which demonstrate that the fuel utilized (Leucine) provided adequate energy for the production of nanoparticles in their as-synthesized form, as supported by adiabatic temperature through thermodynamic calculations. The thermodynamic calculations also include a universal method to estimate the specific heat capacity at constant pressure. Furthermore, even after 2 h of calcination at 600 °C, ZnAl₂O₄ exhibits a single phase with no secondary phases, indicating the material stability and single-phase nature. The crystallinity of ZnAl₂O₄ nanoparticles was observed to increase with increasing annealing temperature. SEM micrographs of as-synthesized samples exhibit the formation of dense particles, voids, and pores in the as-synthesized sample. In addition, tiny aggregates were detected on the surface of more prominent clusters, which reduced as the calcination progressed. In addition, calcined samples exhibit a greater optical reflectance than as-synthesized samples. Tauc's graphs were used to compute the optical energy bandgap. The calculated energy band gap is redshifted to that of the bulk material. The bandgap energy decreases upon calcination, suggesting that the prepared materials have a larger crystallite size or more crystallinity. Correlations were found between the T_ad, and the structural and optical properties of the prepared samples. The findings suggest that Leucine could be used as a novel combustion fuel to produce crystalline ZnAl₂O₄ nanoparticles in their as-synthesis form.     

2017年季节性供气紧张的原因与对策

研究2017年冬季季节性供气紧张形成过程，对于认识我国天然气行业的市场化现状，促进行业平稳发展具有重要意义。为此，基于大量数据分析了2017年我国冬季季节性供气紧张的演变过程和严重程度，进而在前人研究成果的基础上，依据天然气供求框架系统分析了供气紧张的形成原因，并提出了应对策略。结果表明：①2017年季节性供气紧张从9月初见端倪，10月开始出现，11月集中爆发，12月持续发酵，并演变为全国性供气紧张，其严重性体现在供气缺口巨大、波及区域广以及LNG价格大幅度上涨等方面；②经济回暖与“煤改气”导致天然气需求量的增长超过国内外气源的生产与储运能力约束下的供给增长，从而形成季节性供气紧张。最后，提出了针对性的应对策略：①以中游为突破口，上下游配合，有序推进天然气行业的市场化改革是解决季节性供气紧张的根本途径；②统筹推进旧管网的开放与新管网建设，有序建设联络线、核心管网、区域管网等新管网；③减缓经济波动与煤改气的冲击，增强供给的保障能力；④实行季节差价、峰谷差价等手段调节用气高峰需求，取消交叉补贴，推动气价并轨，出台区域性的应急调峰预案与建立区域性市场等。结论认为：2018年天然气供求形势预计有所好转，但形势依然不容乐观。     

新型有机玻璃在站台门的应用及有限元分析

介绍了新型有机玻璃的性能,通过对有机玻璃的相关性能进行分析,确认有机玻璃在站台门系统应用的可行性,为站台门节能减重的设计提供相关依据。     

新西兰食品监督检查良好实践

近年来, 新西兰在食品监管方面不断发展, 实施了一系列新的食品监督检查措施, 这些先进的管理办法值得我们学习和借鉴。本文总结梳理了新西兰政府要求食品企业遵守的3类食品安全控制计划, 并详述了这3类计划(国家计划、食品控制计划、风险管理计划)对应的风险等级、具体的实施范围、实施步骤以及检查频率。最后, 通过结合我国食品监督检查工作现状, 对新西兰食品监督检查工作进行经验总结, 并提出3点建议, 为我国下一步食品安全工作的发展提供信息。     

Economic effects of regulating the seismic strengthening of older buildings

The marked increase in the awareness of earthquake risk following the Canterbury earthquakes in New Zealand offered a unique opportunity to investigate the economic effect of disaster-mitigation regulations on the commercial building stock. A difference-in-differences (DD) framework was used to determine whether earthquake risk has been capitalized into the property prices of buildings constructed prior to 1976, as a response to the national policy requiring assessment and strengthening (or demolition) of the existing earthquake-prone building stock. A negative externality is found in the policy announcement on affected (pre-1970s) office and retail buildings which caused office buildings to suffer a 12.5% stigma discount. However, retail properties were less impacted suffering a 2.3% stigma loss. The value of the commercial building stock has been affected by the policy. These findings provide policy-makers with timely evidence as to the economic effects of New Zealand’s earthquake-prone buildings policy. Facing losses in property value and financial responsibility for retrofitting their assets, building owners will be looking for a workable set of regulatory and non-regulatory incentives to encourage disaster risk management and protect the built environment.     

Protection through property: from private to river-held rights

ABSTRACT

This article explores how private owners can protect bodies of water through private property rights. It compares the use of conventional property rights in the Netherlands and New Zealand with a novel approach whereby a New Zealand river owns itself.     

Rural idylls and urban economies: the making of metropolitan wine regions

In our quest to understand wine industries and their location and development worldwide, much emphasis has been given to key environmental, cultural and economic factors. The concept of terroir is used widely to describe, delimit and promote favoured wine regions. In this, we see constructions of rurality that tend to render invisible important connections between wine regions and urban places. However, many if not most wine regions owe much to their urban neighbours. Cities are sources of labour, capital and customers. Indeed, many wine regions are, in effect, metropolitan wine regions that owe as much to their proximity to cities than they do to any putative environmental distinctiveness and advantages. Wineries in such places develop strategies to survive and prosper not by producing bottles of wine that are widely sold on global markets – and compete on the basis on price or global reputation – but rather because they develop strong and loyal local markets tied to urban economies and because they appeal to the rural idylls held by urban consumers. This paper explores the way urban places have been critical in the development of certain wine regions in New Zealand.     

Performance evaluation of empirical models for vented lean hydrogen explosions

This paper aims to provide a comprehensive review of available empirical models for overpressures predictions of vented lean hydrogen explosions. Empirical models and standards are described briefly, with discussion on salient features of each model. Model predictions are then compared with the available experimental results on vented hydrogen explosions. First comparison is made for standards tests, with empty container and quiescent starting conditions. Comparisons are then made for realistic cases with obstacles and initial turbulent mixture. Recently, a large number of experiments are carried out with standard 20-foot container for the HySEA project. Results from these tests are also used for model comparison. Comments on accuracy of model predictions, their applicability and limitations are discussed.A new model for vented hydrogen explosion is proposed. This model is based on external cloud formation, and explosion. Available experimental measurements of flame speed and vortex ring formation are used in formulation of this model. All assumptions and modelling procedure are explained in detail. The main advantage of this model is that it does not have any tuning parameter and the same set of equations is used for all conditions. Predictions using this model show a reasonably good match with experimental results.     

Evaluation of China's new energy vehicle policy texts with quantitative and qualitative analysis

As one of the strategic emerging industries, the new energy vehicle (NEV) industry receives strong support from the Chinese government. The Chinese government has formulated a large number of policies to promote the development of NEV industry. Evaluating and analyzing the NEV policies are of great significance for improving policy formulation. In this study, we comprehensively analyze 253 NEV policy texts by employing quantitative and qualitative methods. We present the policy instrument types and semantic structure characteristics of policy texts based on the content analysis. The advantages and disadvantages of policy texts are identified by using a quantitative evaluation model. Our results show that the most frequently used policy instrument is regulatory, and the main policy objective is the demand-pull. The policies with higher scores are more comprehensive. Three suggestions are put forward to improve NEV policies.