基于组态分析的数字直播活动效果提升路径研究

[目的/意义]数字直播是企业开展网络活动的重要方式。通过发现能够使企业数字直播活动创造更大价值的要素或要素组合,并采取多途径增强这些要素,从而达到企业数字直播活动效果提升的目的,这对企业发展有创新指导意义。[方法/过程]选取4个与数字直播活动相关的影响因素作为条件变量,采用活动效果作为结果变量,并结合清晰集定性比较分析与线性判别降维对烟草领域数字直播活动的数据进行组态分析。[结果/结论]研究发现,单个因素并不构成提升数字直播活动效果的必要条件,应考虑不同条件因素的组合;存在游戏辅助型和话题支撑型两条组态路径能改善数字直播活动的效果;这两条路径适用不同的数字直播形式,企业应根据自身需求进行选择并在实践中细化路径。     

土壤质量评价指标体系的构建及评价方法

[目的]探究国内外土壤质量评价方法与指标体系,梳理土壤质量评价中的研究热点与发展前沿,为我国土壤质量评估研究及方法应用提供科学参考.[方法]基于Web of Science和CNKI数据库,利用文献计量检索方法,收集有关土壤质量评价指标、最小数据集筛选、土壤质量评价方法等方面的文献415篇、最小数据集155个.基于土壤...     

Relation of carbohydrate reserves with the forthcoming crop,flower formation and photosynthetic rate,in the alternate bearing ‘Salustiana’ sweet orange (Citrus sinensis L.)

The aim of this work was to assess the relation between carbohydrate levels and flower and fruit production, as well as the role of carbohydrates on CO₂ fixation activity, by analysis of leaves, twigs and roots from the alternate bearing ‘Salustiana’ cultivar of sweet orange (Citrus sinensis [L.] Osbeck). A heavy crop load (on year) did not affect photosynthesis activity when compared to non-fruiting trees (off year). Fruiting trees accumulated most of the fixed carbon in mature fruits, whilst no accumulation was observed in roots before harvest. Non-fruiting trees transported part of the fixed carbon to the roots and mobilize it for growth processes and, at the end of the season (December), store it as reserves. Reserve carbohydrates accumulation in leaves started by early December for both tree types, showing the same levels in on and off trees until spring bud sprouting. A heavy flowering after an off year caused the rapid mobilization of the stored reserves, which were exhausted at full bloom. We found no evidence on carbon fixation regulation by either fruit demand or carbohydrate levels in leaves. Carbohydrate reserves played little or no role over fruit set, which actually relied on current photosynthesis.     

西北酸菜直投式发酵剂菌株高密度培养的研究

[目的]制备出适合西北酸菜发酵的复合直投式发酵剂。[方法]前期筛选出3个菌株:产酸速率快的东方醋酸杆菌AC5,降解亚硝酸盐高的干酪乳杆菌L5,醇香味适中的东方伊萨酵母Y7。对这3种菌分别进行高密度培养研究,确定菌体增殖的最佳培养基及培养条件。[结果]确定增殖培养基的成分是马铃薯汁、番茄汁、葡萄糖、蛋白胨和磷酸盐。通过正交试验和培养条件优化得出,AC5的最佳培养基为马铃薯汁含量40 g/L、番茄汁含量80 g/L、葡萄糖含量20 g/L、胰蛋白胨含量10 g/L、磷酸盐含量10 g/L,在pH 5.5、30℃、150r/min下培养24 h活菌数达到3.42×108cfu/ml;L5的最佳培养基为马铃薯汁含量40 g/L、番茄汁含量60 g/L、葡萄糖含量5 g/L、胰蛋白胨含量15 g/L、磷酸盐含量10 g/L,在pH 6.5、30℃、120 r/min下培养24 h活菌数可达到1.93×109cfu/ml;Y7的最佳培养基为马铃薯汁含量60 g/L、番茄汁含量60 g/L、葡萄糖含量20 g/L、胰蛋白胨含量20 g/L、磷酸盐含量10 g/L,在pH 6.0、35℃、150 r/min下培养24h活菌数可达到2.74×108cfu/ml。[结论]该研究使单位体积的活菌数有很大提高,为制备西北酸菜直投式发酵剂提供了依据。     

ZigBee无线传感器网络时钟同步研究

针对ZigBee网络的特点,引入连通支配集的方法对FTSP（flooding time synchronization protocol）多跳同步算法进行改进,在主节点中构建一个最小支配节点集,以减少时钟同步的通信开销．     

伊犁不同类型野生杏花期冻害及座果率研究

为探明影响野生杏花期冻害率、败育率和座果率高低的因素,对伊犁不同地区(四个县)及不同类型的野生杏调查研究结果显示:(1)冻害率在4个不同纬度地区间有显著差异。位于较低纬度的新源县冻害率最高(达57%),位于较高纬度的巩留县冻害率最低(仅4.4%),败育率则是巩留县最高,与其他地区间差异极显著;(2)海拔高度为1300 m时的冻害率为21.4%,而其他高于或低于海拔1300 m的地区则都显著高于1300m处的冻害率,败育率在较低海拔(900 m)地区显著低于其他各海拔高度地区;(3)野生甜仁杏的冻害率显著低于野生苦仁杏,且其败育率也低于野生苦仁杏。座果率则是野生甜仁杏显著高于野生苦仁杏。综合分析得出野生杏花期受冻程度与纬度、海拔高度和杏树的类型有关,败育率和座果率则与纬度和海拔没有必然的相关性,而与其类型有关。野生甜仁杏的抗冻性较野生苦仁杏强。     

陆梁原油化学改性室内研究

陆梁原油属含蜡高凝原油，混合样凝点达18℃。通过对该地区原油进行化学改性试验表明，降凝剂GY－3、CE对陆梁原油有显著的降凝、降效果。加GY－3剂后降凝幅度呆达18℃，降粘率接近90％，低温流动性明显改善，且性能较为稳定。     

Current and emerging concepts in biological and analytical variation applied in clinical practice

A single laboratory result actually represents a range of possible values, and a given laboratory result is impacted not just by the presence or absence of disease, but also by biological variation of the measurand in question and analytical variation of the equipment used to make the measurement. Biological variation refers to variability in measurand concentration or activity around a homeostatic set point. Knowledge of biological and analytical variation can be used to facilitate interpretation of patient clinicopathologic data and is particularly useful for interpreting serial patient data and data at or near reference limits or clinical decision thresholds. Understanding how biological and analytical variation impact laboratory results is of increasing importance, because veterinarians evaluate serial data from individual patients, interpret data from multiple testing sites, and use expert consensus guidelines that include decision thresholds for clinicopathologic data interpretation. The purpose of our report is to review current and emerging concepts in biological and analytical variation and discuss how biological and analytical variation data can be used to facilitate clinicopathologic data interpretation. Inclusion of veterinary clinical pathologists having expertise in laboratory quality management and biological variation on research teams and veterinary practice guideline development teams is recommended, to ensure that various considerations for clinicopathologic data interpretation are addressed.     

基于粗糙集理论的软件项目质量管理研究

软件项目质量管理是贯穿整个软件生存周期的重要工作,重视软件项目质量管理,对整个软件项目管理有着非常重要的促进作用.利用基于粗糙集理论的区分矩阵及属性等价分类计算方法提出软件项目的质量分析系统,并给出两个软件质量因子的相关系统以及区分矩阵的计算方法.通过对历史测评数据的分析,为软件项目的质量控制提供了决策.     

计算机辅助卡介苗优选的综合评判方法

基于结核病的监测防治管理信息系统，提出了卡介苗优选的模糊综合评判数学模型和录属函数的建立，并给出了相应的计算机软件系统。