Bottleneck Analysis of the Minimum Cost Problem for the Generalized Network Based on Augmented Forest Structure

The bottleneck analysis of the minimum cost problem for the generalized network (MCPGN) is discussed. The analysis is based on the network simplex algorithm, which gains negative cost graphs by constructing augmented forest structure, then augments flows on the negative cost graphs until the optimal revolution is gained. Bottleneck structure is presented after analyzing the augmented forest structure. The negative cost augmented graphs are constructed with the bottleneck structure. The arcs that block the negative cost augmented graph are the elements of the bottleneck. The bottleneck analysis for the generalized circulation problem, the minimum circulation problem and the circulation problem are discussed respectively as the basal problems, then that for MCPGN is achieved. An example is presented at the end.

Study on Potential Problems of Shandong Economic Forest Construction and Standardization Construction Scheme

Shandong is a culturally powerful province with excellent natural geographical condition and the warm temperate monsoon climate creates abundant benefits to the agricultural development there.In 2009,Shandong administration bureau of Yellow River economic development held the forum on related issues of national new countryside industry office planning to build economic forest base around the Yellow River in Shandong.The primary intention was settled and the construction of Shandong Economic Forest was formally started.Although impressive progress has been achieved in recent years,there also exists potential problems in the construction of economic forest,among which heavy metal pollution and soil acidification are the worst,causing huge damage to the physiological health of the consumers of economic forest.The writer proposes the countermeasures against standardization construction of economic forest.Scientific management is to be adopted to improve the professional skills of the employees in economic forest and brand innovation should be emphasized to quicken the quality certification of the products of economic forest.Besides,standard production demonstration is to be created and promoted in order to boost scale development.Furthermore,mechanism innovation is also to be stressed and forestry specialized cooperation organizations should be largely supported.

Future Development Direction of the Restoration of Mountains,Rivers,Forests,Farmlands,Lakes,and Grasslands and the Faced Problems

In this paper,the definition,connotation,and internal relationship of mountains,rivers,forests,farmlands,lakes,and grasslands in China are elaborated,and the current situation of ecological restoration projects for mountains,rivers,forests,farmlands,lakes,and grasslands was introduced.Moreover,the problems that have arisen in the specific implementation process of pilot projects were analyzed,such as unclear target positioning,inaccurate analysis of ecological problems,insufficient engineering design systematicness,weak operability of evaluation standards,and weak coordination in engineering management.The development direction and major needs for the protection and restoration of mountains,rivers,forests,farmlands,lakes,and grasslands in the future have been proposed from four aspects:theoretical research,engineering design,effect evaluation,and monitoring and supervision.

An Approximation Algorithm for the Generalized Prize-Collecting Steiner Forest Problem with Submodular Penalties

In this paper,we consider the generalized prize-collecting Steiner forest problem with submodular penalties(GPCSF-SP problem).In this problem,we are given an undirected connected graph G=(V,E)and a collection of disjoint vertex subsets V={V_(1),V_(2),…,V_(l)}.Assume c:E→R_(+)is an edge cost function andπ:2^(V)→R_(+)is a submodular penalty function.The objective of the GPCSF-SP problem is to find an edge subset F such that the total cost including the edge cost in F and the penalty cost of the subcollection S containing these Vi not connected by F is minimized.By using the primal-dual technique,we give a 3-approximation algorithm for this problem.

Thoughts on Building Nanchang a Forestry City

From the concept of urban forest and status quo of urban forest in Nanchang,the problems existing on urban forest were proposed,as well as countermeasures and suggestions.

关于吉林省国有林管护站建设的思考

本文简述了吉林省国有林管护站建设现状,分析了管护站存在问题,提出了管护站工程建设策略。

Data mining for classification of power quality problems using WEKA and the effect of attributes on classification accuracy

There is growing interest in power quality issues due to wider developments in power delivery engineering.In order to maintain good power quality,it is necessary to detect and monitor power quality problems.The power quality monitoring requires storing large amount of data for analysis.This rapid increase in the size of databases has demanded new technique such as data mining to assist in the analysis and understanding of the data.This paper presents the classification of power quality problems such as voltage sag,swell,interruption and unbalance using data mining algorithms:J48,Random Tree and Random Forest decision trees.These algorithms are implemented on two sets of voltage data using WEKA software.The numeric attributes in first data set include 3-phase RMS voltages at the point of common coupling.In second data set,three more numeric attributes such as minimum,maximum and average voltages,are added along with 3-phase RMS voltages.The performance of the algorithms is evaluated in both the cases to determine the best classification algorithm,and the effect of addition of the three attributes in the second case is studied,which depicts the advantages in terms of classification accuracy and training time of the decision trees.

吉林省林草信息化建设现状、问题及发展对策

本文简介了吉林省林草信息化建设现状,梳理出信息化发展过程中存在的问题,有针对性地提出了今后发展对策。

四川省国家储备林建设情况及对策建议

2014年四川省开始启动国家储备林建设,经过几年发展,在推进方式、政策制度、技术规程、建设情况等方面取得了显著成效。但由于尚处于起步阶段,在协作机制、技术力量、思想认识、资本金筹集、林地流转、管理制度等方面仍面临着一些问题和制约。本文通过实地调研和资料收集,深入分析了四川省现阶段国家储备林建设存在的问题,从强化组织领导、加强技术培训、抓好宣传引导、拓宽投融资渠道、探索多机制的林地流转模式、完善管理制度、深化建设管理、增强示范引领等方面提出了全面推动国家储备林建设的对策建议。

舒兰市森林抚育存在的问题及对策

本文介绍了吉林省舒兰市森林资源概况、森林抚育实施情况及成效,分析了森林抚育存在的问题,提出了加强森林抚育的建议与对策。

省属国有林场自然资源确权登记技术方法及问题对策

塞罕坝机械林场是河北省省属国有林场,自然资源生态功能突出、环境相对敏感。文章介绍了省属国有林场确权登记任务目的和技术方法,分析了省属国有林场登记单元三种分类的可行性,结合自身特点,创新自增“省级大型国有林场”作为自然资源登记单元类型中国务院确定的重点国有林区的二级类,代码“41”。阐述了处理权属争议的工作方式和利用现代化的技术与手段实现野外作业在高清影像下实时定位方法,以及确权登记的重点问题和对策,可对全省其他林场自然资源确权登记工作提供思路和方法。

兴安县森林防火浅析

从广西壮族自治区兴安县县情出发,阐述了兴安县森林防火现状,分析了森林防火工作存在的问题,并针对所存在的问题提出了相关的建议和对策。

森林防灭火工作现状分析——以云南西双版纳国家级自然保护区曼稿子保护区为例

针对云南西双版纳国家级自然保护区曼稿子保护区森林防灭火工作存在的问题展开研究。介绍了曼稿子保护区概况,分析了该保护区森林防灭火工作现状,阐述了存在的问题,并提出强化措施,旨在为曼稿子保护区森林防灭火工作提供参考,以更好地保护该区域的生态安全和生物多样性。

哈密市林果业发展现状分析及对策建议

近年来,哈密市不断培育壮大特色林果业。通过实地调研与查阅相关资料,在分析哈密林果业发展现状与存在问题的基础上,提出今后林果业发展对策和建议,为哈密林果业健康、高效、可持续发展提供参考依据。

森林粮油资源与利用研究进展

森林粮油是我国粮油资源的重要组成部分,具有不占用耕地资源、营养价值高、富含多种生物活性物质的优点,经济效益和生态效益良好,有较高的发展潜力。本文主要介绍了蛋白类、淀粉类以及油料类森林木本植物的资源现状、分布情况、成分与功能特征、加工利用现状等,并针对森林粮油产业发展中存在的问题,提出了相对应的解决策略和建议,以期为森林粮油产业的发展提供参考。

新疆退耕还林工程建设存在问题及对策研究

退耕还林是我国生态文明建设的重要举措之一,也是解决生态环境问题的有效途径。新疆作为我国重要的生态屏障和生态功能区,退耕还林工作具有重要意义。然而,新疆在退耕还林过程中面临着一系列问题,如地方政府重视程度不够、技术保障力量普遍薄弱、土地利用冲突、生态补偿机制不完善等。该文通过对新疆新一轮退耕还林存在的问题进行研究,分析了问题的原因,并提出了相应对策,旨在为新疆的退耕还林工作提供参考。

森林抚育存在的问题及改进措施——以千阳县为例

森林抚育是提高森林林分质量,促进林木个体同林分群体健康生长的有效途径,可以有效地修补“生态窟窿”,提升林地生产力、承载力和支持力,培育稳定健康森林生态系统,为县域经济社会发展提供数量更多的生态产品和质量更优的生态服务。结合多年来千阳县森林抚育实践,总结了森林抚育在剩余物处置、作业设计不精细、技术工人缺乏和政策限制等方面存在问题,提出了科学编制作业设计、加强技术培训力度、强化日常监管和加强剩余物综合利用等合理建议。

马龙区林下经济发展现状、存在问题及建议

发展林下经济是生态建设的需要,也是林业健康协调持续发展的需要,是以森林资源为依托,以市场为导向,以提高经济效益为中心,对林下经济实行区域化布局、规模化生产、集约化经营、社会化服务、建立产供销贸工林一体化生产经营,可实现林业发展的可持续循环。马龙区拥有丰富的林业资源和适宜的生态环境,因此发展林下经济具有很大的潜力。该文分析了马龙区林下经济现状,总结了在发展林下经济中存在规模小、集约化程度相对较低、科技人员队伍建设落后等问题,并提出了相应的对策,以期为相关研究提供参考。

呼和浩特市林草业发展情况、特点、存在的问题和建议

随着全球生态环境问题的日益突出,林草业作为维护生态平衡、促进经济社会可持续发展、构建人类命运共同体、推动人与自然和谐共生的关键领域,越来越受到人们的关注。呼和浩特市作为内蒙古自治区的首府,位于我国西北部,既有丰富的森林资源,也有肥沃的草原覆盖,是林草事业高质量发展的重要组成部分之一,其林草业发展状况直接关系到我国生态安全、经济社会发展、生态文明建设的进一步提升。因此,对呼和浩特市林业的发展情况进行深入研究,找出发展过程中的症结,提出合理化的发展建议具有重要的现实意义。

矿山修复为主的山水林田湖草生态修复工程及效益探讨——以大方县煤矿、硫磺矿土地复垦工程安乐F3单元为例

为进一步探索矿山修复为主的山水林田湖草生态修复工程及其产生的效益,以贵州省乌蒙山区山水林田湖草生态保护修复重大工程大方县煤矿、硫磺矿(东关乡片区)土地复垦工程安乐F3单元为例,通过资料收集、现场调查等方法分析矿山存在的生态环境问题与影响。针对主要生态问题,提出以矿山生态修复为主的“土地复垦+污水处理+植被绿化”生态修复措施,同时考虑与矿山生态修复相结合的经济发展,更好地实现矿山生态修复价值最大化,取得良好的生态效益与经济效益,以期为类似矿山的生态修复提供一定的借鉴与参考。