我国聚丁二烯橡胶生产技术进展及市场分析

从生产工艺、新产品开发以及装置设备等方面概述了我国聚丁二烯橡胶生产技术的研究进展,并分析了我国聚丁二烯橡胶的市场情况。2019年我国聚丁二烯橡胶的生产能力为161.5万t/a,消费量为121.0万t,预计2024年消费量将达到约135.0万t。指出了我国聚丁二烯橡胶行业今后的发展趋势。     

2019年中国硫磺市场数据统计与分析

介绍了2019年中国硫磺产量、进口量及市场数据。2019年中国硫磺产量约7440 kt,同比增长9.4%;进口硫磺量11730 kt,同比增长8.8%。2019年中国进口日本、韩国液体硫磺量为2039.9 kt,与2018年基本持平。2019年中国硫磺市场一路走低,年度降幅为50%,在此过程中相关数据屡次刷出新的记录。2019年全国港口库存硫磺均值数达到1890 kt,数据最高点达到2750 kt。2020年中国硫磺国产数量继续有增长预期,而进口数量或许要看港口库存消耗及下游的整体表现,综合来看,2020年的硫磺市场背负的压力并不比前几年小。     

冷链仓储创新装备在河南鲁山精准扶贫中的应用分析

文章对鲁山县董周乡酥梨冷箱仓储扶贫试点应用项目的实施情况开展了专题调研,现将多功能模块化组合冷箱配套农产品市场经营策略精准促进鲁山县董周乡农村产业扶贫的实施情况做系统阐述。     

Optimal correlation of non-renewable and renewable generating systems for producing hydrogen and methane by power to gas process

This paper presents an efficient framework for converting renewable energy to gas and reducing Carbon dioxide (CO₂) footprint at the same time. The problem is presented in two levels. The first level is a minimization programming that minimizes operational cost and CO₂ of generators. The CO₂ is forwarded to the second level. In the second level, Carbon Capture and Storage (CCS) is designed to capture CO₂. The CO₂ is combined with Hydrogen and makes Methane (CH₄). The required Hydrogen is obtained from water electrolyzer that is supplied by the solar system. The capacity and size of water electrolyzer, solar system, and CCS is designed by the planning in the second level while this programming maximizes profit from selling Methane. As a result, the first level presents minimization programming (i.e., minimizing cost and CO₂) and the second level presents maximization programming (i.e., maximizing profit). The programming is developed taking into account solar uncertainty. The stochastic programming is implemented to cope with uncertainties. The problem is formulated as binary mixed integer linear programming and solved by GAMS software. The proposed power to gas (P2G) procedure efficiently designs proper solar system and deals with intermittency of solar energy, reduces CO₂ footprint, maximizes profit, and minimizes operational cost of generators at the same time.     

长沙太平街湘绣产品的市场调查与分析

长沙是湘绣的发源地,集湘绣的研发、生产、销售于一体,拥有着独特的湘绣文化。太平街坐落于长沙市老城区南部,是一条商业繁荣、游客众多的文化老街,主要以销售长沙当地特产、传统手工艺品、特色小吃等为主,极具湖湘文化魅力,吸引了许多外来游客。笔者以太平街为研究范围,对太平街区域内的湘绣销售情况进行了问卷调查,调查显示,太平街区域内的湘绣产品销售情况与湘绣产品的种类和游客群的构成特征关系密切。基于上述调查结果,笔者对当下的长沙地区湘绣销售的前景和未来湘绣文化产品的推广,进行了分析并提供了新的思路。     

Sustainability of ride-hailing services in China’s mobility market: A simulation model of socio-technical system transition

As a symbol of sharing economy, ride-hailing services have spread to Asia, where various forms of services have been established according to the existing socio-technical regimes, including legal, policy, and environmental concerns. China, in particular, has accepted ride-hailing services by revising existing institutions. This study analyzes China’s acceptance of ride-hailing services in the socio-technical system context set up for legacy services. Simulation modeling, combined with transition theory and an agent-based model, is used to analyze the data. This study calculates consumer disutility based on mobility market share, reflecting consumer preference, and predicts the sustainability of ride-hailing services. The simulation results conclude that legalization and socio-technical context are of importance for sustainable mobility.     

Integration of Demand Response in Electricity Market Capacity Mechanisms

Ensuring that the power system meets demand peaks is a key challenge of liberalized markets. On the supply side, capacity can be supported through a Capacity Remuneration Mechanism (CRM). On the demand side, Demand Response (DR) technologies can be deployed. We find that while all traditional generation should receive the same payment, capacity payments for DR technologies should gradually decrease based on operators’ position in the load-shedding order. We observe that all CRM schemes currently implemented provide inadequate incentives to non-price responsive DR and propose to adjust payments to DR units as a function of their expected activation periods.     

数字经济时代网络市场监管创新的思考

数字经济时代,新技术、新产业、新业态、新模式加速孕育,网络市场竞争态势愈加复杂、多变,监管创新成为重要课题。网络市场监管工作应当确立稳定、可预期的监管原则,并落实好包容审慎、事中事后监管、协同监管等原则;对关系到国家安全、社会稳定和公众生命健康等底线性问题,监管不能缺位,而应继续严格审查监管。从创新监管原则的宏观研究,以及大数据监管、提升电子取证能力等监管手段的具体研究等维度,对监管创新进行了深度思考。     

Three-level designs: Evaluation and comparison for screening purposes

Since their introduction by Box and Hunter, resolution criteria have been widely used when comparing regular fractional factorials designs. In this article, we investigate how a generalized resolution criterion can be used to assess some recently developed three-level screening designs, such as definitive screening designs (DSDs) and screening designs from weighing matrices. The aim of this paper is to capture the projection properties of those three-level screening designs, complementing the work of Deng and Tang, who used generalized resolution and minimum aberration criteria for ranking different two-level designs, particularly Plackett-Burman and other nonregular factorial designs. An advantage of generalized resolution, extended here to work on three-level designs, is that it offers a useful criterion for ranking three-level screening designs, whereas the Deng and Tang resolution is used mainly for the assessment of two-level designs. In addition, we applied a projection estimation capacity (PEC) criterion to select three-level screening designs with desirable properties. Practical examples and the best projections of the designs are presented in tables.     

Sweet processed foods in Brazil: use of sugar and sweeteners,inclusion of sugar claims and impact on nutritional profile

This study characterised the main sweet beverages and food products marketed in Brazil regarding (i) the addition of sugar/sweeteners, (ii) nutritional profile and (iii) sugar claims. Results revealed that most of the beverages had added sweeteners, while food products were mainly sweetened with sugar. Moreover, >90% of the powdered products had added sweeteners. ‘Zero sugar’ (46%) and ‘light’ (55%) were the most common sugar claims in sugar-free and reduced-sugar products, respectively. Powdered products, soya drinks and baked products included claims less frequently. Regarding the nutritional profile, beverages with sugar substitution had a proportionally greater reduction in the content of carbohydrates and calories (up to 99%, for both) in relation to food (<82% and <85%, respectively). The results suggest that reducing sugar in solid foods remains a greater challenge than in beverages and that this reduction has less impact on the final energy density of foods.