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排序方式: 共有99条查询结果,搜索用时 218 毫秒
1.
Many efforts have been made to define patterns,predict,and forecast energy use. However,changes in energy consumption may be studied in detail using various methodologies.This work presents a statistical methodology to assess changes in a facility consumption profile. Consumption patterns are obtained from a historical database of a predefined time interval,according to the type of day( day of the week,working or non-working),and an index that assesses change in the electrical consumption profile is proposed. Assessing these changes enables associating these values with possible events in a facility,which can serve to generate alarms in an energy management system,and reduce costs and maintenance periods. Additionally,a multi-criteria interpretation of the applied test table is presented that offers explanations and identifies possible causes of anomalous consumption. 相似文献
2.
Xavier Bignalet 《电子产品世界》2017,(12)
纵观与物联网(IoT)相关的全球市场活动,几乎所有细分市场的所有主导品牌最终都采取了针对IoT的策略.此外,绝大多数中小型企业也都在这一方向上进行了投资.在我看来,IoT有五个核心功能亟需解决:检测、控制、安全、连接和云分析. 相似文献
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INTRODUCTIONMultibladerowcalculationscanbeperformedusingsteady3DNScodesprovidedthatassumptionsaremadeforthecouplingofbladerows.Thesocalledmixing--planeapproachneedsthetangentialaveragesofflowquantitiesattheinterfaceplanebetweenadjacentbladerows.Butth... 相似文献
5.
回望历史,在街道纵横如迷宫般的Raval区,靠近Paral.lel的街边曾经立着一座漂亮的剧院。这里一度游人如织热闹非凡,只是随着时间的流逝,剧院逐渐变成了一座摇摇欲坠的建筑,勉强支撑于残破的外表与年久失修的墙壁之上。令人 相似文献
6.
Fernandes JC Tavaria FK Soares JC Ramos OS João Monteiro M Pintado ME Xavier Malcata F 《Food microbiology》2008,25(7):922-928
The objective of this study was to elucidate the controversial relationship between the molecular weight (MW) of chitosans and their antibacterial activity (upon different inoculum levels, at several concentrations). The influence of food components on the activity was also ascertained, as well as acceptance by a sensory panel. All the compounds tested exhibited antibacterial activity against Staphylococcus aureus and Escherichia coli. This activity was shown to be closely dependent on the inoculum level, MW and concentration used. Within 4h at 10(3) cells/mL, all five compounds, at every concentration (0.5%, 0.25% and 0.1%, w/v), proved to be bactericidal; for higher inocula, 0.1% (w/v) was only bacteriostatic; at 10(7) or 10(5) cells/mL, and independently of the inoculum level, 0.25% (w/v) of any chitooligosaccharide (COS) mixture was sufficient to reduce the E. coli initial population by at least 3 log cycles; COS never exhibited bactericidal action over S. aureus, unlike high and medium MW chitosans-which, at 0.5% (w/v), presented a bactericidal effect even against 10(7) cells/mL. When incorporated in liquid food matrices, medium and high MW chitosans maintained their activity, for both matrices and bacteria, although a slower activity was noticeable in milk; however, COS lost their activity upon both bacteria in milk after 4-8h. Furthermore, addition of chitosans to apple juice led to several unpleasant off-flavors, such as astringency and after taste--which increased in magnitude with MW. 相似文献
7.
以高聚物负载型双金属阴离子配位化合物PBM为催化剂,合成了二氧化碳-环氧丙烷-己内酯三元共聚物(PPCL)。用FT-IR1、H-NM R、13C-NM R、DSC和W AXD等对PPCL进行了表征,并考察了反应单体比例对共聚物性能的影响。结果表明,ε-己内酯单元的引入,有效地提高了聚合物的特性黏数和玻璃化转变温度。随着ε-己内酯单元摩尔分数的增加,共聚物的体外降解速度加快。 相似文献
8.
Mgl.7M0.3(M=Mg,Ti,Al)Ni贮氢合金结构及性能研究 总被引:1,自引:0,他引:1
采用固态烧结法制备了Mg1.7M0.3(M=Mg、Ti、A1)Ni贮氢合金,X射线衍射分析结果表明,适当提高烧结温度有利于Mg2Ni相的形成;Ti对Mg的取代未引起合金相结构的明显变化,而A1取代Mg除有Mg2Ni相外,还有一呈立方晶体结构的新相生成。Ti、A1对Mg的取代,不仅提高了Mg2Ni合金的放电容量,同时也提高了合金的循环寿命。 相似文献
9.
聚碳酸亚丙酯改性复合材料的性能 总被引:4,自引:0,他引:4
通过溶液共混法实现聚碳酸亚丙酯(PPC)与聚乙二醇(PEG)的共混改性,提高PPC的热性能。通过1HNMR、FTIR研究了共混物的相容性,表明聚合物之间没有发生化学反应,两者之间为简单的物理共混,相容性较好,而且共混物的亲水性随着PEG组分的增加而增强。热性能测试结果表明,共混物的玻璃化转变温度(Tg)和热分解温度(Td)都比PPC高,Tg和Td95%最高分别达到51℃和410℃,比PPC提高了29℃和130℃。可用于制备高性能的包装材料。 相似文献
10.
Sreeprasad TS Maliyekkal MS Deepti K Chaudhari K Xavier PL Pradeep T 《ACS applied materials & interfaces》2011,3(7):2643-2654
Multifunctional graphene oxide/reduced graphene oxide (GO/RGO) composites were prepared through electrostatic interaction using biocompatible ingredients. Different functionalities were added to GO/RGO by anchoring materials such as native lactoferrin (NLf), NLf protected Au clusters (designated as Au@NLf), chitosan (Ch) and combinations thereof. Anchoring of Ch and NLf enhances the antibacterial property of RGO/GO. The addition of Ch to RGO/GO not only helped in forming stable dispersions but also helped in fabricating large (cm(2)) area films through a simple solvent evaporation technique. Functionalities such as photoluminescence were added to Ch-RGO/GO composites by anchoring Au@NLf on it. The composites thus formed showed stable luminescence in presence of various metal ions in the solid state. The composite showed reasonable stability against pH and temperature variations as well. The as-prepared films were transparent and the transparency could be modulated by controlling the concentration of RGO/GO in the composite. The antibacterial property and ability to form stable thin films may provide an opportunity to use such composites for medical and environmental remediation applications as well. Erasable patterns were fabricated on the film by stamping required patterns under compressive pressure. Luminescent patterns can be inscribed on the film and can be erased by simply wetting it. Such films with erasable information may be useful for security applications. 相似文献