Local adjustment method for field experiments. 2. Application in experiments with and without replications

Summary Presented are the results of an application of the local adjustment Field-method in the analysis of the real field experiments without replications and in experiments with pseudo- and random replications. It was found that the local adjustment allowed a more precise estimation of the real values of genotypes in all kinds of experiments over a wide interval of spatial heterogeneity. The results obtained indicate that by simply using up to 5 random replications the decrease of the spatial effects is inadequate for fields with medium and high soil heterogeneity or with unsuccessful randomization. The Field-method which has sufficient precision in evaluating spatial heterogeneity, considerably increases the reliability of estimates in experiments even with a small number of replications or with unsuccessful randomization. Therefore, for all field experiments that have fulfilled the necessary requirements the Field-method is recommended as an obligatory statistical procedure for a prior data analysis as it allows an accurate estimation of the real character expression of genotypes, as well as the random variance in experiments without replication and the parameters of ANOVA in ones with pseudo- and random replications.     

Comprehensive Fuzzy Evaluation Method for Sand Liquefaction

According to the fuzzy and uncertainty characteristics of soil liquefaction, a comprehensive fuzzy evaluation model of soil liquefaction is presented. In the comprehensive fuzzy evaluation model of soil liquefaction, the following factors, such as earthquake intensity, SPT counts, groundwater level and mean diameter of sand soil particle which affect the liquefaction of sand soil were considered, and the sketch map of trapezoid subordinate function was adopted and the subordinate function expression of each factor was given. The results show that the comprehensive fuzzy evaluation model of soil liquefaction is feasible and valuable.     

河南省渔业增加值的加权Markov残差修正预测研究

引入友精度指标,基于加权马尔可夫链(Markov)理论提出了灰色残差修正模型,并运用马尔可夫状态转移矩阵对未来残差的符号进行判定.以1994-2011年河南省渔业增加值为基础,建立预测模型,并在模型中不断加入新信息,进行实证分析.结果表明,与传统的灰色预测相比,预测值平均相对误差由8.33％降低为2.54％,较好地提高了预测的精度.     

Urban Green infrastructures: How much did they affect property prices in Singapore?

In 2015, 17 Sustainable Development Goals were outlined within the 2030 Agenda by the United Nations. Objective 11.7 aims to provide universal access to safe, inclusive, and accessible green and public spaces, highlighting the strategic role of these areas in cities. In the international literature, the theory of Ecosystem Services (ESs) has been developed to raise public awareness of the need to preserve biodiversity, enhance community cohesion, civic identity, and quality of life. In this study, we explored the economic value of Singapore's Urban Green Infrastructures (UGI) by investigating the private condominium and apartment unit market through the Hedonic Pricing Method (HPM). The HPM was integrated with Geographic Information System (GIS) to spatialize housing units, measure the distance of different green spaces, and consider the dependence effects among housing unit transactions. The results highlighted a positive effect on values of the proximity to the natural green areas, as well as to the regional, city parks, and small nature areas. The annual benefits of UGIs on households within 800 m range from 10,305,275 USD for nature areas to 59,723,703 USD for the city parks and 74,011,689 USD for the regional parks. Estimates showed the small contribution of park connectors (PCN) and neighborhood parks. The HPM results are a useful aid to understanding the amenity value of UGIs. The modeling outcomes could be used to inform policymakers and municipal green managers about UGIs preservation and new allocation starting from households’ preferences.     

离散Hardy算子与差分方程

对一类具有单调正解的非线性二阶差分方程，得到了其刻划，这些刻划与离散的Hardy算子的加权有界性相关。     

基于GIS的合肥市中心城区绿地可达性分析评价

为对合肥市中心城区(二环内)绿地进行可达性分析,并提出优化建议,在遥感(RS)和地理信息系统(GIS)技术支持下,运用景观可达性的概念与原理,建立城市绿地可达性模型,采用费用加权距离方法,结果表明:1)绿地破碎化较为严重,但绿地可达性总体较好;2)绿地可达性的空间格局仍存在不均衡;3)一环内外绿地可达性存在明显差异;4)城市绿地可达性分析是衡量城市绿地服务功能社会公平性的有力手段,充分体现城市建设"以人为本"的理念。因此,城市绿地可达性分析结果能有效地评价城市绿地格局和服务功能,可为合理调整与设计城市绿地系统提供科学依据。     

植物新品种权价值评估折现率的确定方法研究

折现率作为收益法评估植物新品种权时重要参数之一,细微的差异都有可能导致品种权评估结果的显著不同。因此,如何合理确定折现率是收益法在植物新品种权评估中需要解决的重要难题,该文依据知识产权收益法的整体思路,就品种权收益法评估中的折现率问题展开讨论,首先介绍折现率的几种计算方法,通过对加权平均成本(CACC)和资本定价模型(CAPM)进行改进,构建基于CACC和CAPM的扩展贴现率估值模型,并利用种业公司的资本结构、股权以及债务等数据资料对其参数进行实证分析。     

山东沿海生态系统服务协同与权衡的空间格局及驱动力

提升区域生态保护效能,可为区域生态治理科学决策提供政策依据,以山东省沿海地区为研究区,使用InVEST模型和CASA模型测度产水服务、土壤保持、植被固碳和生物多样性的时空演变,借助差异比较法探究生态系统服务协同权衡的时空分异机制,进一步利用多尺度地理加权回归(MGWR)剖析了自然因素和人类活动因素对协同权衡的影响。结果表明：(1) 2018年研究区产水服务、生物多样性的均值为605.27 mm/a, 0.28,2010—2018年总量递增速率分别为0.21 mm/a, 0.23;土壤保持、植被固碳的均值为0.000 73 t/(hm²·a),537.56 gC/(m²·a),2010—2018年总量递减速率分别为0.62 t/(hm²·a),2.1 gC/(m²·a)。(2) 2010—2018年,生态系统服务的协同权衡具有显著的空间异质性,产水服务分别与土壤保持、生物多样性表现为强权衡弱协同;植被固碳分别与产水服务、土壤保持、生物多样性表现为强协同弱权衡。(3)产水服务、土壤保持、植被固碳三者存在...     

一种面向农业无人机影像分割的尺度参数自动确定方法

【目的】自动提取影像中作物种植区域信息,对于推动无人机高分辨率影像在精准农业中的应用具有重要意义。本研究针对分割评价函数中加权局部方差法(weighted local variance,WLV)的缺陷,面向农业无人机影像高精度自动分割的需求,提出改进方法并基于不同作物田间试验数据进行对比验证。【方法】针对WLV没有充分考虑分割对象内部同质性的问题,本研究在WLV的基础上增加对象间同质性的计算,提出了改进加权局部方差法(improved weighted local variance,IWLV)。设计玉米氮肥试验和小麦水肥试验,获取不同作物不同时期及长势下的无人机影像。基于获取的无人机影像,设置不同情景,分别耦合主流分割算法与WLV、IWLV法开展影像分割,将它们的分割结果与人机交互分割结果进行对比,并基于单尺度对象精度(single-scale object accuracy,SOA)法进行评价。【结果】基于WLV法选择的最优分割尺度往往偏大,分割影像时会存在欠分割现象,而基于IWLV法选择的分割尺度进行分割的结果与人机交互分割结果更为接近。对于所有设定的分割情景,IWLV法获得了更高...