大兴安岭生态功能区建设的区划分析及“G＋X”管理模式构建

依据价值分析理念,对大兴安岭生态功能区进行了区划分析,并构建了大兴安岭生态功能区建设的＂G＋X＂管理模式。     

城区道路景观共生模式研究——以金寨县将军大道为例

对小城镇沿河主干道的道路周边用地和道路中央分隔带进行景观设计和植物配置,将生态学中的共生机制原理运用到景观规划中,将地形、地貌、地物的自然景观,满足人类精神需要的人文景观,道路行车安全的功能景观和谐优化,初步探讨出一种共生机制下的小城镇道路景观共生模式。     

关于林业数学模型中参数的取值问题

针对国内林业期刊文献中普遍存在的数学模型参数取值不规范的问题，提出林业数学模型的参数取值，应遵循小数位统一和有效数统一的原则，而且有效数统一原则应该成为最高准则；同时还对与这两项原则有关的某些特定林业数表模型中参数的取值和估计问题进行讨论。     

山东农业科技期刊学术影响力分析与动态评估

利用动态评估模型对2008~2012年山东13种农业科技期刊的学术影响力进行分析。结果显示,2008~2012年中,13种农业类科技期刊的总被引频次和影响因子总体呈上升趋势,5年间,平均总被引频次增加了84.85%,平均影响因子增加了47.35%;平均学术影响力呈快速增长趋势,5年间增长了268%。各期刊发展不均衡,其中,《山东农业科学》和《中国烟草科学》学术影响力分别位居第一和第二,且发展态势良好。     

Design and Experiment of Slave Computer Control System for Applying Variable-rate Liquid Fertilizer

In order to increase the applying rate of liquid fertilizer and reduce environmental pollution, a slave computer control system for applying variable-rate liquid fertilizer was designed. The system used SMC as core processor and electrically controlled pressure regulator as execution component. The characteristic equation of the system was obtained by using classical control theory. Results indicated that the characteristic equation met the requirements of routh-criterion, which indicated the working process of the system was stable. Performance of the slave computer was verified via bench tests. Results demonstrated that there was no significant influence on the response from interclass error. The fertilization error was less than 0.9, and the fertilization accuracy was larger than 97%. The liquid fertilizer emitted by the fertilizing devices had no significant difference in uniformity, which met the demands of the slave computer control system for applying variable-rate liquid fertilizer.     

Comparison of dietary essential amino acid requirements determined from group‐housed versus individually‐housed juvenile bluegill,Lepomis macrochirus

Two 60‐day experiments were conducted sequentially to determine (i) lysine requirement of juvenile bluegill, Lepomis macrochirus based on the dose–response method, (ii) requirements for other essential amino acids (EAAs) using whole‐body amino acid profile and (iii) whether differences in growth rates of group‐housed versus individually‐housed bluegills lead to different lysine requirement levels because of the presence and absence, respectively, of social hierarchies. Seven, semi‐purified, experimental diets (isonitrogenous, isocaloric) were prepared to contain graded levels of digestible lysine (10–31 g kg⁻¹). Experiment‐1 involved group‐housed bluegills (approximately 27 g, n = 10 fish/chamber, 4 chambers/diet) whereas experiment‐2 involved individually‐housed bluegills (approximately 30 g, n = 1 fish/chamber, 14 chambers/diet). Fish were fed twice daily to apparent satiation. Bluegill growth responses in both experiments generally improved (P < 0.05, anova ) with increasing dietary lysine levels from 10 to 16 g kg⁻¹, and then levelled off with further increase in lysine level (P > 0.05). Optimal dietary lysine level (digestible basis) was estimated to be 15 g kg⁻¹ based on broken‐line regression analyses of relative growth rate and feed conversion ratio with no differences being observed between the two rearing methods. Determined dietary requirement levels for other EAAs ranged from 2.4 g kg⁻¹ (tryptophan) to 15.3 g kg⁻¹ (leucine).     

保健食品中原花青素测定的不确定度评定

对保健食品中原花青素的测定进行不确定度的评定,建立不确定度评定程序和方法。依据《保健食品检验与评价技术规范》建立数学模型,进行不确定度的计算并合成不确定度。找出了影响保健食品中原花青素测定的主要因素,分析归纳了不确定度分量的主要来源。评定程序和方法符合规范要求,适用于同类型试验不确定度评定。     

食用菌产品线下体验线上销售新模式应用探究

基于O2O与电子商务的理论背景,分析了线下体验线上销售模式应用于食用菌产品运营中的可行性,运用SWOT方法分析了该方法的优势、劣势、机会和威胁,构建了食用菌产品线下体验线上销售平台,并从财务成本管理的角度对该模式的成本与盈利进行了简要分析。结果表明,线下体验线上销售模式的应用会使得企业内部成本控制得到进一步优化,能降低促销成本,改变企业的分销战略,增加企业的营业外收入,降低交易成本。     

农村土地流转信托化的法律机制构建

从法律层面厘清了土地流转信托的概念,明晰了土地流转信托委托人、信托人及受益人的权利与义务,分析了我国土地流转信托在实践中存在的问题,如委托人权利缺乏维护,受托人过失缺乏追究,受益人权利缺乏保障,信托财产缺乏独立性,政府角色缺乏公立性,金融信贷缺乏畅通性。对此,提出了构建土地流转信托机制的设想:单独制定农村土地流转信托法律法规,加快土地流转信托确权登记颁证制度,强化政府的宏观调控职能,建立土地流转信托基金,加强金融合作,推行农村土地信托责任保险。     

混合沙粒对半开式叶轮离心泵磨损的影响

为了研究含有混合多种颗粒粒径的含沙水对离心泵过流部件磨损特性的影响,应用RNG k-ε湍流模型和SIMPLEC算法,基于颗粒离散相模型(DPM)和半经验的McLaury磨损模型,沙粒注入选用Rosin-Rammler分布的拟合方法,对一台半开式离心泵内固液两相流的磨损特性进行数值分析.研究结果表明:叶轮流道内沙粒组分中大颗粒有趋向叶片吸力面运动的趋势,当混合沙粒的粒径较小时,蜗壳内沙粒运动较为均匀,粒径越大,沙粒运动越贴近蜗壳壁面;不同粒径组分的沙粒在叶轮的压力面、吸力面和后盖板壁面上的平均停留时间分布相似,颗粒粒径越大,平均停留时间越小;在蜗壳壁面上沙粒组分中粒径不大于700 μm的沙粒平均停留时间分布规律与沙粒在叶轮过流壁面上的平均停留时间类似,大于700 μm的沙粒平均停留时间会随着粒径增加而增大;随着沙粒组分中大粒径沙粒的增加,叶片压力面的磨损强度逐渐减弱,叶片吸力面、后盖板和蜗壳的磨损强度逐渐增强.