Evaluation of the Performance of Financial Support for Agriculture in Guizhou Province Using Secondary Relative Benefit Model Based on DEA

We use the secondary relative benefit model based on DEA to evaluate the performance of agricultural financial expenditure in Guizhou Province, which can give due consideration to the production effectiveness determined by objective natural conditions, and management effectiveness of all regions (as decision-making body) in the use of financial fund for supporting agriculture. In general, there is north-south gradient difference in the performance of financial support for agriculture between regions in Guizhou Province. The drought in 2010 has significant impact on the technical efficiency in the whole province; the performance score of each item in Liupanshui City and Southwest Guizhou is very low; the technical efficiency and management efficiency in most regions need to be improved. In order to improve the performance of financial support for agriculture, we need to ensure the scale of input; at the same time, provide appropriate preferential financial policies for agricultural infrastructure, especially the construction of rural water conservancy, development and promotion of agricultural science and technology, and other fields; adopt the way of special check and acceptance of supporting projects to strengthen the use management of the fund for agriculture.

Study on Soil and Water Conservation Benefit Models of Grassland Ecosystem──A Case Study on Jianou Mountain Grasslan Ecosystem

This paper studies the mechanism of grassland ecosystem's soil and water conservation function on the basis of two years experiment and inspection in Jianou mountain grassland ecosystem experiment station, Fujian province. After anaIysis on the data of soil erosion and runoff coefficient, relations between eroded soil, runoff and slope gradient. we establish soil and water conservation benefit models. According to the mode1s, experiment and inspection results, some proposals have been made to decrease the area of soil erosion in Fujian mountainous areas, e. g., optimizing land use structure in mountainous areas, taking suitable measures for local condition, closing hills for grassland development, accelerating restoration and raising quality of mountain grassland ecosystem, strengthening scientific and technological input, breeding the grass species that are suitable to local physical geographic condition.

Spatial distribution prediction and benefits assessment of green manure in the Pinggu District,Beijing,based on the CLUE-S model

Green manure use in China has declined rapidly since the 1980 s with the extensive use of chemical fertilizers.The deterioration of field environments and the demand for green agricultural products have resulted in more attention to green manure.Human intervention and policy-oriented behaviors likely have large impacts on promoting green manure planting.However,little information is available regarding on where,at what rates,and in which ways（i.e.,intercropping green manure in orchards or rotating green manure in cropland） to develop green manure and what benefits could be gained by incorporating green manure in fields at the county scale.This paper presents the conversion of land use and its effects at small region extent（CLUE-S） model,which is specifically developed for the simulation of land use changes originally,to predict spatial distribution of green manure in cropland and orchards in 2020 in Pinggu District located in Beijing,China.Four types of land use for planting or not planting green manure were classified and the future land use dynamics（mainly croplands and orchards） were considered in the prediction.Two scenarios were used to predict the spatial distribution of green manure based on data from 2011：The promotion of green manure planting in orchards（scenario 1） and the promotion of simultaneous green manure planting in orchards and croplands（scenario 2）.The predictions were generally accurate based on the receiver operating characteristic（ROC） and Kappa indices,which validated the effectiveness of the CLUE-S model in the prediction.In addition,the spatial distribution of the green manure was acquired,which indicated that green manure mainly located in the orchards of the middle and southern regions of Dahuashan,the western and southern regions of Wangxinzhuang,the middle region of Shandongzhuang,the eastern region of Pinggu and the middle region of Xiagezhuang under scenario 1.Green manure planting under scenario 2 occurred in orchards in the middle region of Wangxinzhuang,and croplands in most regions of Daxingzhuang,southern Pinggu,northern Xiagezhuang and most of Mafang.The spatially explicit results allowed for the assessment of the benefits of these changes based on different economic and ecological indicators.The economic and ecological gains of scenarios 1 and 2 were 175691 900 and143000 300 CNY,respectively,which indicated that the first scenario was more beneficial for promoting the same area of green manure.These results can facilitate policies of promoting green manure and guide the extensive use of green manure in local agricultural production in suitable ways.

Cost-Benefit Assessment of Inspection and Repair Planning for Ship Structures Considering Corrosion Model Uncertainty

Owing to high costs and unnecessary inspections necessitated by the traditional inspection planning for ship structures, the risk-based inspection and repair planning should be investigated for the most cost-effective inspection. This paper aims to propose a cost-benefit assessment model of risk-based inspection and repair planning for ship structures subjected to corrosion deterioration. Then, the benefit-cost ratio is taken to be an index for the selection of the optimal inspection and repair strategy. The planning problem is formulated as an optimization problem where the benefit-cost ratio for the expected lifetime is maximized with a constraint on the minimum acceptalbe reliability index. To account for the effect of corrosion model uncertainty on the cost-benefit assessment, two corrosion models, namgly, Paik＇ s model and Guedes Soares＇ model, are adopted for analysis. A numerical example is presented to illustrate the proposed method. Sensitivity studies are also providet. The results indicate that the proposed method of risk-based cost-benefit analysis can effectively integrate the economy with reliability of the inspection and repair planning. A balance can be achieved between the risk cost and total expected inspection and repair costs with the proposed method, which is very. effective in selecting the optimal inspection and repair strategy. It is pointed out that the corrosion model uncertainty and parametric uncertaintg have a significant impact on the cost-benefit assessment of inspection and repair planning.

Comprehensive benefits assessment of the ecological management model in Hobq Desert of China

The Hobq Desert is the seventh largest desert in China. Since 1988, the effects of ecological management in Hobq Desert have been obvious and a typical desertification control model developed gradually, which is well known as the ＂Hobq model＂. It is important to evaluate the comprehensive benefits of the ＂Hobq model＂, but this has not been addressed in previous studies. Thus, we established an index system to comprehensively evaluate the benefits of the ＂Hobq model＂, using an analytic hierarchy process method from 1988 to 2013. The results show the following： ecological benefits of the ＂Hobq model＂ had a positive trend, but with fluctuations during 2008 and 2009; economic benefits increased by 74% and the maximum value occurred in 2013; and social benefits increased steadily, but with fluctuations in 2010 and 2011. The social benefits were higher than ecological and economic benefits in the same period. Trends in overall benefits of the ＂Hobq model＂ were similar to changes in ecological benefits, which increased each year.

Cost-benefit Analysis of Scale Pig Breeding in Shandong Province Based on Modified Entropy Weight-TOPSIS Model

According to the relevant statistical data in National Agricultural cost-benefit Data Compilation(2001- 2013),we use the modified entropy weight- TOPSIS model to research the cost-benefit status of scale pig breeding in Shandong Province from the perspective of comparing it with that of the entire country and 9 other main pig producing areas. The results show that compared with the national average,the cost-benefit ratio of small scale pig breeding in Shandong Province is lower,while the cost-benefit ratio of medium scale and large scale pig breeding is significantly improved; the cost-benefit ratio of small scale pig breeding in Shandong Province is basically the same as that in 9 other main pig producing areas,while the cost-benefit ratio of medium scale and large scale pig breeding is higher; the output value of main products and the purchase price of piglet are two major bottlenecks restricting the cost-benefit improvement of scale pig breeding in Shandong Province.

西藏草业时空拓展的模式和路径

草业发展是维护西藏生态屏障安全的重要内容,也是高原特色畜牧业高质量发展和西藏牧民维持生计的传统优势产业。国家生态安全与粮食安全战略背景下,西藏草业高质量发展受到时空条件的制约。本研究借助城市时空拓展理论,阐明了西藏草业发展时空拓展的必要性和可行性,并依据西藏草业资源的禀赋特征,提出了聚焦生态效益模式、生产效益模式、生态和生产效益兼顾模式,以及实现3种模式的路径,以期为西藏草业未来的发展提供理论指导,也为我国其他地区草业时空拓展提供借鉴。

Benefit Analysis of Chemical Fertilizer Input for Staple Grain Production Based on Threshold Panel Data Model

Based on the threshold panel data model,this paper analyzed the nonlinear relationship between chemical fertilizer input and grain output. At the provincial level,from the perspective of average and marginal net benefits,it compared the effects of chemical fertilizer input on farmers' income. It reached the conclusion that the chemical fertilizer input efficiency has deviated from the optimal level. Thus,only by increasing the marginal productivity of chemical fertilizers,may it be able to increase farmers' income.

浅论基于实施效益决策的标准化业务模式

为了进一步提升标准化行业对我国高质量发展的促进作用,本文从标准化原理角度探讨了企业和标准化行业获取标准化效益的案例,总结分析了我国现行标准化业务模式的发展、问题、困境和创新苗头,提出一种基于实施效益决策的标准化业务模式,并初步分析了该业务模式的意义和难点。该业务模式综合了标准化需求分析、标准化范围建立、解决方案统筹与测算、方案优化协调与测算、基于效益规则的标准协定、完整贯标改造、标准实施效益核算和实施范围推广等主要工作环节,供学术交流研讨和业务实践指导。

Application of the AERMOD Model to Evaluate the Health Benefits Due to Air Pollution from the Public Transport Sector in Ha Noi, Viet Nam

Fine particulate matter (PM2.5) mainly originates from combustion emissions on-road transportation. Exposure to PM2.5 could be considered one of the primary causes of diseases such as heart attack, stroke, lung cancer, and chronic respiratory, which made it one of the most important co-benefits when evaluating the impact of GHG mitigation measures. This study quantifies the co-benefit of Ha Noi’s modal shift from private to public means of transport, which are reduced air pollution and extended life expectancy, combining AERMOD model and benefit transfer method. Analytical results show that shifting from motorbike to electric train could be the most beneficial option in term of health co-benefit, compared to the usage of standard buses and BRTs.

CEV模型下目标收益型养老金的最优投资和支付策略

该文研究了目标收益计划下养老金的最优投资策略和支付策略.养老金的支付取决于计划的财务状况,且风险由不同代人分担.养老基金可以投资于无风险资产和风险资产,其中风险资产价格由几何布朗运动模型推广为常方差弹性(CEV)模型来驱动.以最小化收益风险和福利风险的组合为目标,利用动态规划原理和HJB方程,推导出了最优投资策略和最优福利调整的闭型解.最后,数值实例分析了模型参数对控制问题的影响.

基于价值链的饲料企业营销模式分析

市场对动物源性食品的旺盛需求有效提高了饲料企业的经济效益,这对实现饲料企业的可持续发展具有重要的推动作用。但在复杂多变的市场环境下,饲料产品同质化、产能过剩、需求多元化等现实情况都对饲料企业的市场营销提出了挑战。为了更好地帮助饲料企业创造价值,需要从价值链的角度入手,对饲料企业的营销模式进行分析,力求通过提高产品销量来为饲料企业的可持续发展奠定基础。

“双碳”背景下林纸绿色供应链利益分配优化模型及应用研究

在“双碳”发展背景下,考虑核心竞争能力、主观投入水平、客观贡献程度、生态绩效贡献度、风险承担强度等影响因素,构建优化夏普利值法模型,应用算例并结果分析,从研究结果可知,在林纸绿色供应链发展及利益分配过程中,首先要认识到影响因素对林纸绿色供应链的发展及利益分配的重要性。其次,要始终将绿色化贯穿林纸绿色供应链整个发展过程,充分体现林纸绿色供应链发展与“双碳”发展的目标一致性。

病毒性脑炎217例症状性癫痫发生风险的预测研究

目的分析病毒性脑炎并发症状性癫痫的风险因素,据此构建列线图预测模型。方法回顾性分析2018年2月至2022年5月汕头市中心医院收治的217例病毒性脑炎病人临床资料,抽取70%为建模集(152例),30%为验证集(65例)。根据病人是否合并症状性癫痫,将建模集进一步分为发生组和未发生组,比较两组病人一般资料,选择差异有统计学意义的指标用逐步向前回归法进行非条件多因素logistic分析病毒性脑炎病人症状性癫痫发生的影响因素,并采用R3.4.3软件包绘制基于多因素分析结果的列线图模型。采用Bootstrap法分别对建模集和验证集进行验证,并绘制受试者操作特征曲线(ROC曲线)和决策曲线(DCA)以评估列线图模型的预测效能和临床净获益率。结果217例病毒性脑炎病人中,共46例病人合并症状性癫痫(21.20%),其中建模集中有32例合并症状性癫痫,验证集中有14例合并症状性癫痫;发生组昏迷、大脑皮质损坏、脑电图重度异常、颅脑核磁共振成像(MRI)有责任病灶、累及颞叶或额叶、脑脊液单纯疱疹病毒(HSV)(+)占比及脑脊液压力均高于未发生组(P<0.05);logistic多元回归分析,昏迷、大脑皮质损坏、脑电图重度异常、颅脑MRI有责任病灶、累及颞叶或额叶、脑脊液压力、脑脊液HSV(+)均是病毒性脑炎合并症状性癫痫的影响因素(P<0.05);经Bootsrap法进行验证,建模集其一致性指数(C-index)为0.833,验证集的C-index则为0.830,校正曲线和标准曲线拟合度较好。建模集ROC曲线下面积(AUC)、灵敏度、特异度分别为0.84[98%CI:(0.78,0.89)]、79.17%、84.04%,验证集则为0.81[98%CI:(0.76,0.86)],83.04%,73.64%,提示模型区分度良好。DCA曲线显示病人根据列线图模型进行风险评估可获得满意的净收益。结论昏迷、大脑皮质损坏、脑电图重度异常、颅脑MRI有责任病灶、累及颞叶或额叶、脑脊液压力、脑脊液HSV(+)均是病毒性脑炎合并症状性癫痫的影响因素,综合上述因素针对病毒性脑炎病人构建的列线图预测模型可以较好地个体化预测症状性癫痫的发生,对临床防治症状性癫痫提供指导。

基于部分预算法下加气灌溉技术经济效益分析

加气灌溉是目前最为高效的节水灌溉技术之一,是在地下滴灌的基础上,利用空气泵或气泡发射器提高土壤含氧量的一种灌溉方法。为了明确加气灌溉技术在大田作物种植中的主要应用效果与经济效益,为加气灌溉技术在农业生产中的推广及应用提供理论依据,采用部分预算法对田间加气灌溉后的经济效益进行综合评价。研究结果表明:与常规滴灌技术相比,加气灌溉技术与常规种植技术相比,总收益分别为25400.05元/hm^(2)和20162.14元/hm^(2);从农业净收益来看,加气灌溉技术可以增加326.03元/hm^(2),部分投资收益率超过700%;加气灌溉技术可以显著减少农业灌溉用水量,提高作物产量,提升农业经济收益,具有良好的应用推广价值。

基于P-E-R和成本收益模型的青岛市适度人口规模研究

基于P-E-R模型,选取反映经济发展和资源利用水平的各项指标,通过加权分析建立回归模型,对青岛市适度人口规模进行了研究,同时从成本收益角度分析构建了适度人口测度模型考察了青岛市的城镇化质量,以新型城镇化发展为焦点,为应对未来人口增长提供了资源配置方案及建议.结果表明:青岛市经济人口承载力优势显著,明显高于资源人口承载力;现阶段青岛市人口发展符合适度人口规模,人口增长存在一定空间,但人口增长速度低于全国水平;预计到2035年,青岛市人口约为1200万人.

“公转铁”政策对地方铁路货运业经济效益影响分析

为探究“公转铁”政策对我国铁路货运业经济效益的影响,以2018年开始推进的“公转铁”政策为准自然实验,基于19个省份40条地方铁路线的2012—2020年地方铁路数据和地方铁路线所在地区的经济发展数据,运用双重差分模型探究“公转铁”政策对地方铁路货运业经济效益的影响。结果表明,“公转铁”政策短期内对地方铁路的货物周转量促进作用显著,对地方铁路货运业的经济效益有正向影响但不显著。“公转铁”政策带来的货物周转量增长会促进地方铁路运输企业的运输收入增加,但是为适应铁路货物周转量增加而进行的铁路基础设施改造、扩建及铁路运价调整会显著影响运输成本增加,导致短期内“公转铁”政策对地方铁路货运业的经济效益影响不显著。