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.     

Consumers’ willingness to pay for upcycled foods

Research on food waste reduction suggests that solutions aimed at reducing waste early in the consumption cycle are the most impactful. Based on this premise, food research labs and food manufacturers have started creating and selling foods made from food ingredients that are generally discarded. Such foods, termed upcycled foods, are safe for human consumption and provide a promising solution to reduce food waste. However, the commercial success of this new category of foods will depend on consumers’ acceptance. This research examines a key indicator of acceptance – consumers’ willingness to pay. We find that although consumers are willing to pay less for upcycled foods compared to conventional alternatives, messaging increases consumers’ willingness to pay. Specifically, we find that rational messaging is more effective than emotional messaging. Overall, our findings suggest that upcycled foods may command good acceptance among consumers.     

新型冠状病毒疫情对我国电力行业的影响分析

全球经验表明,疫情会对经济社会产生负面影响。此次中国武汉市新型冠状病毒疫情爆发的时间节点、波及的领域范围,以及为应对疫情釆取的相关部署安排,既考验着电力行业保障电力安全可靠供应的能力,也会直接或间接通过电力供求形势变化影响电力企业的生产运行。结合疫情因素和近年来中国经济运行中电力供求变化特点,本文认为疫情将会降低工业和商业用电负荷,医疗机构新增用电和居民生活用电将会显著增长,但鉴于工商业用电比重较高的事实,全社会用电量同期同比增速将明显放缓。考虑到近年来用电增速放缓的经验事实,此次疫情或将放大电力行业积聚的矛盾和困难,因此为发挥市场在电力资源配置中的决定性作用而加快推进电力体制改革和全国统一电力市场建设愈发重要与迫切。     

测井新技术在页岩储层中的评价与应用

测井新技术对于页岩气勘探开发具有很好的应用前景,可用于页岩储层的识别和评价。为了更好地总结测井新技术在页岩储层识别与评价中的应用,通过文献调研,归纳了页岩储层测井识别新技术,梳理了测井新技术在页岩储层识别与评价中解决的主要地质问题,列举了部分测井新技术的应用效果,对此后页岩气勘探开发具有一定的指导意义。     

新形势下中国天然气营销体系建设探讨

随着我国天然气产业的快速发展,天然气营销体系有待于进一步的调整和完善,在天然气市场快速增长、基础设施开放、营销主体多元化、价格市场化等行业发展的新形势下,亟待建设适应新形势的天然气营销体系,以助推天然气市场化发展迈入新阶段。为此,梳理了我国天然气营销发展历程,分析了天然气营销发展的特点以及存在的问题,探讨了天然气营销体系发展面临的形势:①我国天然气营销体系发展存在着市场缺乏有效的调动机制、营销经营价值没有体现、下游零售环节市场细分尚不充分、上游销售直供困难重重等问题;②面临着天然气市场进入新一轮快速增长期,基础设施开放、营销主体多元化成为必然,价格市场化机制逐步形成等新形势。进而从现有天然气市场营销实际发展的角度出发,提出了在新形势下建设适应市场化的天然气营销体系的发展思路及措施建议:①从以产品为中心向以客户为中心转变,运用现代市场营销理论,基于天然气市场产品、价格、渠道、促销四大市场营销关键要素,构建以营销战略规划、市场价格、销售管理、营销渠道、市场营销信息、客户服务为主的专业化、独立化的营销系统;②将营销行为和客户服务紧密结合,把天然气客户所需融入企业营销过程中,使天然气销售更能适应市场发展需要,促使天然气市场环境更加公平和充满活力。     

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.     

一种新型磁选机磁系装配夹具工艺及结构研究

分析了一种新型磁选机磁系，针对新型磁选机的磁系排布特点，与传统的磁系的装配方法进行了比较，给出了切实可行的装配方法，针对堵漏磁极设计了方便实用的工装，且对其进行了结构和运动学上的分析。在保证磁系的技术性能的基础上，使装配更加简单，减轻了劳动强度，降低了装配磁系过程可能发生的生产事故，进而可提高生产效率。     

新工科理念下“扩频通信技术与应用” 课程教学实践

本文以“扩频通信技术与应用”课程为例，探讨新工科理念下工程学科实践教学改革，具体措施包括：开展虚拟仿真实验，充分发挥双师型教师的主观能动性，开展MATLAB仿真训练、工程技术实训及相关的创新创业训练，结合企业实习以及开展国际交流合作等。     

Lithium metal hydrides (Li2CaH4 and Li2SrH4) for hydrogen storage; mechanical,electronic and optical properties

Hydrogen storage is a critical step for commercialisation of hydrogen consumed energy production. Among other storage methods, solid state storage of hydrogen attracts much attention and requires extensive research. This study rationally and systematically designs novel solid state hydrides; Li₂CaH₄ (GHD is obtained as −6.95 wt %) and Li₂SrH₄ (GHD is obtained as −3.83 wt %) using computational method. As a first step, we suggest and predict crystal structures of solid state Li₂CaH₄ and Li₂SrH₄ hydrides and look for synthesizability. Then, the mechanical stabilities of hydrides are identified using elastic constants. Both hydrides fulfil the well-known Born stability criteria, indicating that both Li₂CaH₄ and Li₂SrH₄ are mechanically stable materials. Several critical parameters, bulk modulus, shear modulus, Cauchy pressures, anisotropy factors of hydrides and bonding characteristics are obtained and evaluated. Furthermore, electronic and optical band structures of hydrides are computed. Both Li₂CaH₄ and Li₂SrH₄ have indirect bands gaps as 0.96 eV (Г-U) and 1.10 eV (Г-R). Thus, both materials are electronically semiconducting. Also, Bader charge analysis of hydrides have been carried out. Charge density distribution suggests an ionic-like (or polarized covalent) bonding interaction between the atoms.