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1.
利用双层线性规划模型的某些性质和对偶理论,分析了双层线性规划问题的最优解、约束域的极点以及下层问题的对偶问题三者之间的关系,进而提出了一种求解双层线性规划问题的全局最优解的新算法.算例表明所提出的算法是简便而有效的.  相似文献   

2.
《纺织导报》2006,(11):36-36
Rieter(立达)纺织系统是各种天然纤维和合成纤维集成制造系统的领先供应商,也是全球唯一能够提供覆盖整套纺纱全流程产品与专利技术的供应商,能够为客户开发最优解决方案.同时,Rieter纺织系统也是用于生产和加工工业丝、地毯纱、非织造布的设备与系统的领先制造商.  相似文献   

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本文阐述了高校宿舍文化的内涵及构建最优高校宿舍文化的意义。分析了目前高校宿舍文化中存在的问题,提出了构建最优高校宿舍文化的对策。  相似文献   

5.
本文提出以热点距离权值重心构造的Wi-Fi最优热点组网通信算法,获取最优热点空间位置并组合至一起,从而实现Wi-Fi最优通信,提高通信效率。  相似文献   

6.
在运用统计最优近场声全息进行声场重建时,重建频率对重建精度有着很大的影响。为进一步验证重建精度随重建频率的变化情况,在100Hz~3000Hz的频率范围内,对统计最优近场声全息方法进行了数值仿真分析。仿真结果表明,在该频段内,统计最优近场场全息方法具有良好的重建精度。  相似文献   

7.
基于贝叶斯估计理论基础,从减小最优滤波算法计算量、提高计算效率的角度综述了GaussHermite滤波、扩展Kalman滤波、Sigma点Kalman滤波算法中的确定性采样计算方法以及粒子滤波算法中随机样本点粒子计算方法,指出:针对粒子滤波算法中采样函数设计、重采样技术、高斯近似法与粒子滤波法的有效融合来设计研究新型高效高精度粒子最优滤波算法,将成为未来Bayesian最优滤波理论方法研究的重要领域和发展方向,而构建区间粒子最优滤波理论算法不失为粒子滤波理论算法研究的新思路.  相似文献   

8.
威博  黄雅亮 《现代家电》2012,(12):63-63
日前,以"创新求进破冰前行——打造性价比最优的核心供应链"为主题的2012年广东威博电器有限公司供应商年会在顺德总部胜利召开。威博公司中高层领导以及涵括温控器、电热管等领域的近90名供应商参加了会议。通过与供应商携手,为合作伙伴提供最优的性价比、最稳定的品质、最及时的交付、最短的交货期、最佳的服务。威博与供应商的关系已经进行更深入、亲密的合作,成为战略合作伙伴的关系。  相似文献   

9.
把顶点数是n,边数是e的所有图称作一类图,寻找给定图类的一致最优可靠图.证明了八面体是所在图类及6个顶点12边图类的一致最优可靠图,同时找到了立方体所在图类及8个顶点12边图类的一致最优可靠图.  相似文献   

10.
在企业战略导向下,结合实际可利用的资源,探索基于EVA的项目组合最优配置方法,构建了三维度的项目最优组合模型,通过EVA指标、风险指标和战略符合度对项目进行综合性评价,最后在三维坐标系中对项目组合进行最优配置,为管理层的投资决策提供重要支撑。  相似文献   

11.
Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.  相似文献   

12.
An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.  相似文献   

13.
The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.  相似文献   

14.
The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.  相似文献   

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This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.  相似文献   

18.
<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the  相似文献   

19.
《印刷工业》2014,(11):95-95
According to Printing and Printing Equipment Industries Association of China(PEIAC)'s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%.  相似文献   

20.
《印刷工业》2014,(8):103-103
正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press  相似文献   

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