网络购物物流服务质量评价指标权重研究(二)

该文提出运用调查问卷法和层次分析法相结合的方法来进行网络购物物流服务质量评价指标相对权重的分析研究,在互联网发放了265份调查问卷,并回收有效问卷221份。然后,以调查问卷所得数据为基础,采用SPSS13.0软件和层次分析法,分别从发货卖家、网络购物消费者、既是发货卖家又是消费者,既不是发货卖家又不是网络购物消费者以及四者的整体角度进行了网络购物物流服务质量评价指标相对权重的分析,从而得出来自不同评价角度的网络购物物流服务质量评价指标权重结果。结果表明,除了既是发货卖家又是消费者的被调查者认为信息服务能力比时间性更为重要之外,基本上可以认为各网络购物物流服务质量评价指标的相对权重从高到低依次为送货服务水平,接单服务水平,正确安分履行订单能力,时间性,信息服务能力,价格。     

基于扩散型TTI与鲜银耳品质关联模型的建立及验证

为了建立扩散型时间-温度指示器(Time-Temperature Indicator,TTI)与鲜银耳品质参数的关联模型,实现TTI对鲜银耳品质的监控,分别研究了4种贮藏温度（5℃、13℃、17℃和23℃）下,扩散型TTI的RGB值及鲜银耳品质参数（失重率、可溶性蛋白质含量、可溶性糖含量以及丙二醛含量）的变化情况,通过反应动力学模型及Arrhenius模型获得了扩散型TTI颜色变化和鲜银耳品质变化的活化能Ea,并建立了扩散型TTI的RGB值与鲜银耳品质参数的关联模型。研究结果表明,在贮藏过程中,随着贮藏时间的延长,TTI的RGB值均呈下降趋势,且贮藏温度越高,RGB值下降幅度越大,其颜色变化的活化能值为36.1135 KJ/mol;随着贮藏时间的延长及贮藏温度的升高,鲜银耳的品质发生了劣变,其品质参数均与扩散型TTI的活化能差值在25 KJ/mol之内;基于扩散型TTI颜色变化与鲜鲜银耳品质参数构建了二者之间的关联模型,经实验验证其相对误差均在15%之内,证明了扩散型TTI在银耳品质监控中的应用潜力。因此,有望将此扩散型TTI用于鲜银耳贮藏过程中的品质监控并实现对银耳品质的预测。     

我国EIA有效性分析与指标优化研究

分析了我国环境影响评价（EIA）有效性现状及评价全过程,对现有EIA有效性评价的指标体系进行了优化,并提出将环境健康指标纳入指标体系的建议,籍以更好地提高我国环境影响评价有效性。     

Trillium grandiflorum height is an indicator of white-tailed deer density at local and regional scales

High densities of white-tailed deer (Odocoileus virginianus) in the U.S.A. and Canada are reducing or preventing forest regeneration, and as a result, deer function as a keystone species in some sites. Management decisions about deer require reliable population density data, which are challenging to obtain at both regional and local scales. We tested the broad-scale applicability of the indicator species approach in which forage plant height was used to estimate deer density. The maximum heights of marked and unmarked plants of the widely distributed, spring-flowering polycarpic herb, white trillium (Trillium grandiflorum) were measured across southern Ontario, Canada, over a 15-year period. A significant negative relationship was found at 10 sites between maximum plant height and estimates of deer population densities, which were derived from counts of live or culled animals and varied from 7 to 40 deers km⁻². Maximum plant height could be reliably measured within a 4-week period. The underlying mechanism driving the negative relationship between plant height and deer density was attributed to deer preferentially selecting taller plants that grew less than ungrazed plants in the subsequent year. In 16 additional sites with locally high deer populations, the mean maximum height of T. grandiflorum appeared to be a more reliable indicator of deer density than estimates based on hunter returns across the broader regional scale of the Wildlife Management Unit. The ability to assess local scale white-tailed deer densities based on measuring heights of an easily identifiable, widespread plant, provides local residents and landowners with a tool for estimating the potential impacts of deer browsing and grazing in local woodlots and forests, improving local knowledge about herbivory pressure.     

不同砧木嫁接对甜瓜生理和品质的影响

为了比较不同砧木对甜瓜部分生理指标和果实品质的影响,筛选适合甜瓜生长的良好砧木。以‘新盛玉’甜瓜为材料,采用田间试验、植物生理生化测定方法,研究了不同砧木嫁接对甜瓜生长过程中叶片生理指标和果实品质的影响。嫁接能提高甜瓜3个生长时期叶片叶绿素含量,提高叶片POD、SOD、CAT和PPO活性,降低叶片MDA含量,但不同的嫁接组合表现有差异;3个处理中,越瓜砧木嫁接苗果实可溶性固形物、可溶性糖、可溶性蛋白和维生素C含量最高,自根苗其次,南瓜砧木嫁接苗最低;小区产量最高的为越瓜砧木嫁接苗,其次为南瓜砧木嫁接苗,自根苗最低。综合相关指标来看,越瓜砧木表现优于南瓜砧木,可以作为‘新盛玉’甜瓜的良好砧木。     

基于草地退化指示植物大狼毒的植被指数研究

为建立基于指示植物的滇西北地区草地退化遥感评价技术体系,将有毒植物大狼毒（Euphorbia jolkinii）作为草地退化的指示植物,筛选并构建了反映草地群落中大狼毒组分信息的植被指数。结果表明：部分特殊样地有可能放大GPS定位偏差对植被指数与地面调查指标相关性研究的不利影响,最好予以剔除。现有的植被指数与大狼毒调查指标的相关性略低于其与总体调查指标的相关性,不适合作为大狼毒的遥感监测指标。采用Landsat 5卫星第5波段影像校正后的植被指数与大狼毒调查指标的相关性增加,而与总体调查指标的相关性降低,在弱化样地总体群落信息、突出大狼毒组分信息方面GNDVIc表现最佳,较适用于草地群落中大狼毒组分的遥感监测。     

恩诺沙星脂质纳米乳剂对断奶仔猪血液生化指标的影响

为研究不同剂量恩诺沙星脂质纳米乳剂对断奶生长仔猪血液生化指标的影响,分别按0．6、1．25、2．5、5．0mg／kg剂量对仔猪进行给药,并在给药后2、6、8和96h前腔静脉采血制血清,测定仔猪谷草转氨酶（AST）、谷丙转氨酶（ALT）、碱性磷酸酶（ALP）、淀粉酶（AMY）、尿素（Urea）和肌酐（Crea）六项血液生化指标的含量。结果显示,四个不同剂量给药组的ALT、AST、ALP、AMY和Crea的含量在2、6、8和96h与对照组差异不显著（P〉0．05）;各剂量组的Urea在2h与对照组未见统计学差异,但5．0mg／kg剂量组在6h与对照组和0．6mg／kg剂量组差异显著（P〈0．05）,在8h和96h时间点的数值与对照组和其他剂量组差异显著（P〈0．05）。试验表明,随着剂量的增加,恩诺沙星脂质纳米乳可能会对仔猪肾脏功能产生一定影响。     

水生藻类的环境指示作用(英文)

为了有效地监测水环境中的氮磷污染物、重金属、农药及其他有机污染物,笔者论述了水生藻类对水体环境中相应污染物的敏感性和耐受性,以及污染物对水域生态系统中藻类种群结构所造成的影响,分析了污染物对水生藻类的毒理和富集等。由此表明:水生藻类对一些水环境污染物具有较好的指示作用,该方法便于直观快速地调查分析相应水体的污染情况。     

Key Habitats in the Norwegian Production Forest: A Case Study

This study investigated the forest history, structural characteristics, the presence of fungal species suggested to indicate ecological continuity in old-growth forest, and the species composition of saproxylic beetles in 30 old forest ''woodland key habitats'' (WKHs), and compared them with production forest in the same age-class in south-eastern Norway. No statistically significant differences in forest characteristics, community of saproxylic beetles or number of red-listed beetles were found between the WKHs and the production forest, probably owing to a combination of profound long-term logging and a lack of will to delineate sufficiently large WKHs in the one area with significantly less forestry impact. The study indicates the advantage of including forest history information in WKH selection where such data exist, and the importance of restoring habitats in heavily exploited forest landscapes.     

福建龙眼树冻害指标初探

强低温常给龙眼树造成伤害,重则死亡,探讨龙眼树的冻害指标对龙眼树的合理布局和低温预警具有重要意义。为此,本文收集福建省近几年冬季低温考察资料、龙眼树冻害调查资料,引用考察文献中的龙眼树冻害和同期的低温资料,参考广西壮族自治区气象减灾研究所1999／2000年冬季10多县（市）龙眼树冻害的照片资料和对应的低温资料;经统计处理整理成同时同地龙眼树的冻害级别与百叶箱中的最低气温资料;相关分析表明：龙眼树冻害级别与最低气温间可以用一元二次方程拟合,龙眼树的无冻害、轻冻害、中冻害、重冻害、严重冻害对应的最低气温分别为-0．2℃、-1．6℃、-2．6℃、-3．3℃、-3．5℃;各冻害级别之间平均温差随着冻害级别的提高而缩小。