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排序方式: 共有75条查询结果,搜索用时 15 毫秒
11.
Improvement of air distribution in refrigerated vertical open front remote supermarket display cases
I. Gray P. Luscombe L. McLean C.S.P. Sarathy P. Sheahen K. Srinivasan 《International Journal of Refrigeration》2008,31(5):902-910
This paper presents some of the results derived from extensive experimentation on display cases for supermarkets and derives some possible improvements to augment temperature uniformity and energy performance. The effect of the perforation pattern of the rear duct on the distribution of airflow between these and the front curtain is brought out. The critical component is air infiltration across the curtain, which is governed by internal air distribution and curtain characteristics. It is observed that a 70–30 distribution of flow between the curtain and the rear duct perforations yields a performance that satisfies the standards. Further, a judicious distribution of perforations on the rear duct at various levels and across is necessary. Correlations available in the literature are useful in making a qualitative assessment of the results. 相似文献
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A diet rich in vegetables provides many nutrients such as vitamins, minerals, and fiber; as a result, eating vegetables could reduce the risk of chronic diseases. However, very few Americans consume enough vegetables daily, and average intake falls significantly below national recommendations. This study aimed to examine the effectiveness of seasoning and increased portion sizes on vegetable consumption in a US adult population. An observational study was conducted in a commercial cafeteria that provided options of steamed or seasoned green beans, broccoli, cauliflower, and carrots (n = 890). The portion size was 8-oz, double the standard vegetable size (4-oz). Participants returned 527 surveys with information regarding vegetable choice, liking, and demographics. Leftover bowls were collected for waste analysis. According to binomial tests, significantly more people purchased the seasoned vegetables over steamed (p < 0.001); in detail, the same trend was observed with the purchasing data of seasoned green beans, broccoli, and cauliflower (p < 0.001 for each vegetable type). Vegetable likings were high and similar across all vegetables and cooking methods with an average of 7.3 (9 = like extremely). Overall, 8-oz (226.8 g) servings resulted in 16.59 mean g waste and 210.21 mean g of consumption. To conclude, cooking vegetables with herbs and spices was well accepted by the adult population as was a larger portion size. 相似文献
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Commercial refrigeration comprises food freezing and conservation in retail stores and supermarkets, so, it is one of the most relevant energy consumption sectors, and its relevance is increasing. This paper reviews the most recent developments in commercial refrigeration available in literature and presents a good amount of results provided these systems, covering some advantages and disadvantages in systems and working fluids. Latest researches are focused on energy savings to reduce CO2 indirect emissions due to the burning of fossil fuels. They are focused on system modifications (as dedicated subcooling or the implementation of ejectors), trigeneration technologies (electrical, heating and cooling demand) and better evaporation conditions control. Motivated by latest GWP regulations that are intended to reduce high GWP HFC emissions; R404A and R507 are going to phase out. Besides hydrocarbons and HFO, CO2 appears as one of the most promising HFC replacements because its low contribution to global warming and high efficiencies when used in transcritical and low-stage of cascade systems. 相似文献
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John L. Casti 《Artificial Life and Robotics》2000,4(3):125-129
Large-scale, agent-based simulations are dramatically changing how one studies real-world processes, especially social and
behavioral processes. This paper addresses some of the ways this computing technology enables us to understand more about
the world of business. In aprticular, we show here how computer simulation has been used to investigate the efficiency of
stock markets and the operation of a supermarket. Both examples illustrate the point that it is possible to gain a much deeper
understanding of the ways of business by screating “laboratories” for doing controlled, repeatable scientific experiments
with such systems.
This work was presented in part at the Fourth International Symposium on Artificial Life and Robotics, Oita, Japan, January
19–22, 1999 相似文献
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秦宇伟 《智能计算机与应用》2011,(2):17-18
连锁超市特别是中小型连锁超市信息化管理水平比较落后,缺少合适的信息化管理系统.本系统基于B/S架构,采用ASP与SQL数据库技术相结合,实现连锁起市分类信息发布,商品统一管理、调度、具有很强的实用性和现实意义. 相似文献
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The invasive larger grain borer, Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae), originating from Meso-America, is a devastating stored product pest of maize (Zea mays L.) and cassava (Manihot esculenta). This species can destroy up to 40% of stored maize within four months. Despite four decades of research, P. truncatus has spread throughout Africa, while decimating maize and cassava production. Given the continuing problems with P. truncatus, the likelihood for its continued range expansion under climate change, and its status as a species of concern in many countries, the objective of this review was to provide an updated and comprehensive freely accessible record of the distribution and spread, biology, development, and ecology, host preferences, chemical ecology, detection, and monitoring, and management of P. truncatus. We conducted a search of the literature from 1911 to 2021 using Google Scholar and Web of Science to find all papers related to key search terms. We found that P. truncatus has been recorded in 36 countries across the globe, including 21 now in Africa. A recent predictive model found that the insect has been limited to tropical and subtropical regions but could likely spread to temperate regions as temperatures rise with climate change. Conspecifics respond to their two component, male-produced aggregation pheromone early after eclosion, but quickly switch to other cues as older adults. At close-range, P. truncatus may use food cues, but host volatiles are not involved in long-range host finding of commodities. Research on managing P. truncatus has mostly focused on chemical control to the detriment of other tactics, with the most promising tactic likely to be the different hermetic storage technologies. Many outstanding areas of basic behavior and ecology remain to be assessed for P. truncatus. We highlight specific areas that should be prioritized for further work in order to better manage and reduce the impact of this invasive insect pest. 相似文献
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超市所处的地理位置,对于超市的经营状况起到十分重要的作用,因此对超市选址进行研究具有重要意义.本文采用ArcGIS缓冲区分析和叠加分析功能对超市选址进行研究.从超市选址的主要影响因素出发,分别对淮安市淮海街道人口中心、交通线路以及已有超市位置进行缓冲分析,得到人口密度分布图、交通便利缓冲图以及已有超市竞争范围图,然后将... 相似文献