基于Android的综合公园养护日志管理系统研究

养护日志编写是综合公园管理的重要日常工作之一,文章基于Android移动终端平台,分析了综合公园养护日志管理应用于移动终端的功能需求及原则,提出并设计了能在本地及移动互联网环境下进行实时编写、报告、查询、规则展现的综合公园养护日志管理系统。     

我省林业审计要实现三个突破

省林业厅为了认真贯彻《审计法》,健全林业审计体系,全面落实今年部、省审计任务,于四月中旬召开了有各地市林业局、厅直单位和森工系统国有大中型企事业单位40多位负责审计工作的同志参加的全省林业审计工作会议,安排部署今年的审     

企事业单位突发环境事件应急预案编制技术要点

对企事业单位突发环境事件应急预案编制过程中预案体系、突发环境事件分级、预防与预警、应急设施及措施、信息报告等编制技术要点进行了归纳总结,旨在为企事业单位突发环境事件应急预案编制提供技术支持。     

新会计制度的实施对事业单位财会工作的影响

财会工作是企事业单位正常运行的关键一环,而新会计制度的实施对当前企事业单位的工作形成了巨大的影响,为了保障相关工作的有效开展,相关工作人员需要加强对新会计制度的掌握,并对其形成的影响进行充分了解。从我国新会计制度实施之后财会工作所面对的一系列问题入手,分析了新会计制度对财会工作的影响和应对措施,以期对实际的工作提供帮助。     

新干县林业局开展夏季消防安全检查

<正>为切实加强夏季森林火灾防控工作,江西省新干县林业局决定从即日起至9月底,在全县林业系统组织开展夏季森林消防检查工作。此次的消防检查主要任务是落实消防安全监管责任,动员涉林企事业单位集中开展夏季火险隐患综合治理,提高企事业单位自我管理水平;加大消防设施建设,增强企事业单位火灾防控能力,确保夏季全县林业系统不发生重     

区林业厅党组认真贯彻落实全区国有企业党建工作经验交流现场会议精神

区林业厅有40多个直属企事业单位党的组织关系在当地党委。为切实加强和改进对区直林业企事业单位党建工作的领导，厅党组一班人认真学习区党委在桂林召开的全区国有企业党建工作经验交流现场会议精神和有关文件，认真分析存在问题，研究制定措施，下决心把企事业单位的党建工作抓紧M。一是于6月底前，分三个片召开了区宜林业企事业单位党委（总支、支部）书记参加的党建工作座谈会，传达全区企业党建会议精神，交流经验，座谈讨论，部署安排工作。二是按照企业党建会议精神，明确党组织关系在当地党委的区直林业企事业单位的党建工作实行…     

对地勘单位财务管理的几点思考

财务管理是企事业单位的核心,加强地勘单位财务管理,建立健全相应的财务管理制度,规范财务收支行为就显得尤为重要。针对当前地勘单位财务管理出现的诸多问题,本文分析了当前地质勘探单位财务管理的现状和存在的问题,并就如何完善其财务管理相关制度提出了建议。     

保定市城市森林的树木种类组成及其构成特征

为了解保定市城市森林的树木种类组成及其构成特征,对其城市森林6种类型的树木进行了抽样调查.结果表明:组成保定市城市森林的树木种类共有35科65属98种,其中本地种39种,引进种59种;树种属的区系地理成分以北温带成分为主,占其总属数的40.32 %;其城市森林6种类型组成树木种类的多少从大到小依次为居民区林、企事业单位林、风景林、公用林、行道树、防护林;企事业单位林和居民区林的树种多样性最高,防护林的树种多样性最低.     

国内樱花繁殖方法研究进展

对近几年国内各大专院校、企事业单位所做的樱花繁殖方法的研究进行了综述，提出了对其未来发展方向的展望。     

公路建设单位经济责任审计中常见问题及原因分析

公路建设单位领导干部经济责任审计已成为近年审计的工作重点,这一领域的审计既具经济责任审计的一般性,又具公路建设项目审计的特殊性.现结合公路建设中的审计,对该领域审计中常见问题出现的原因进行了分析.     

世界原木定心技术现状及发展趋势

原木定心技术在木材加工生产中广泛应用。精确定心,对提高木材利用率及经济效益是十分重要的。在分析现有定心技术的基础上,综合世界森林资源短缺及科学技术进步情况,提出原木定心技术向采用计算机扫描控制、提高精度、效益和效率方面发展是必然趋势。     

结合深度学习与Hough变换的等长原木材积检测系统

针对成捆堆放的原木端面图像,利用机器视觉方法开发一个材积检测系统,算法的鲁棒性和系统应用的方便性是两个关键难点.为了解决上述问题,实现原木材积自动化检测,设计并开发了结合深度学习与Hough变换的等长原木材积检测系统.首先,在对训练样本做了旋转、调整曝光度、加噪声等提高模型鲁棒性的预处理后,使用YOLOv3-tiny卷...     

Modeling prescribed burns to serve as regional firebreaks to allow wildfire activity in protected areas

Management around wilderness parks ideally requires thorough fire suppression in proximate settled and commercially exploited lands and natural fire within protected areas. To satisfy these requirements, we explored a potential regional firebreak (firewall) based on a series of prescribed burns in Quetico Provincial Park in northwestern Ontario, Canada. Fire managers were recruited each to independently devise a regional firebreak using simulated prescribed burns. The experts’ five designs consisted of between 9 and 25 prescribed burns, set over periods ranging from 3 to 8 years, and covering from 7900 to 26,100 ha. Each wildlife ignition was run after the entire firebreak was created and the vegetation was reclassified to account for post-fire vegetation re-growth. The potential efficacy of each design was tested using worst-case historical weather and 100 random ignitions in the Prometheus fire growth simulation model. Without a firewall, 100 ignitions resulted in 69 fires escaping the park and consuming 483,900 ha of forest beyond the park boundary. The firewall designs were all effective, reducing the area burned outside the park to between 15,400 and 35,400 ha. There was a 77–90% reduction in the number of fires escaping the firewall areas and an average reduction of fire area beyond the park of 92%. Moreover, one can map the geographic weak points in each design, which encourages iterative firebreak design improvements. For instance, firewalls set nearer the park boundary allowed fewer fires to start between the firewall and the boundary, so increasing firebreak effectiveness. The cost of the above systems can be regarded as taking preventative measures against the risk of future economic loss, and the modeling approach reduces the uncertainties in associated decision making.     

影响重组木和单板条平行胶合材力学性能的主要工艺因子的比较与分析(英文)

通过工艺实验,对重组木和单板条平行胶合材(PSL)的主要力学性能进行了研究。采用杨木、落叶松和桦木小径材作为重组木原料;以胶合板厂的杨木及桦木旋切后的废单板条作为PSL的原料。在实验室条件下,利用低质小径木和木材加工剩余物,制造出具有高强度的结构用重组木和PSL;对两种人造木材的工艺条件进行了比较与分析,分别提出了影响重组木和PSL力学强度的主要工艺因子。结果表明热压压力是影响重组木力学强度的一个重要工艺因子,而单板条长厚比对PSL也是一个重要工艺因子。     

Predicting Log Type and Knot Size Category Using External Log Shape Data from a 3D Log Scanner

The use of new technology such as 3D scanners for measuring log shape at sawmills is increasing. These scanners can provide a detailed model of log shape and evenness of the log mantle area. These data can be used for optimizing yield but also for predicting quality of the sawn goods. This report presents a model for quality - related log features based on data from a 3D log scanner. The model includes routines for development of variables related to four categories of log properties: surface unevenness, log taper, cross - sectional out - of - roundness and straightness. In total, 230 Scots pine (Pinus sylvestris L.) logs are used for developing and validating logistic regression models for sorting logs into classes of log type and knot size. The models are tested on validation data: 97% of the logs were sorted correctly according to log type and 79% were sorted correctly according to knot size.     

Stiffness gradients in radiata pine trees

A mill study of 62 trees, in which boards were reassembled into their original logs, permitted the construction of wood quality maps. In this instance stiffness profiles were obtained from butt to upper-top logs, based on machine stress grading of all boards and then averaging values from the 62 trees. Traditionally the butt log has been perceived to be the most valuable log in a tree, because it is bigger and gives a higher recovery of lumber. However, it is shown to contain a wide cone of very low stiffness wood that is confined to the first 2.4–2.7 m above ground level. Above this point stiffness gradients become cylindrical with no noticeable decrease in stiffness up the tree stem. Stiffness in all logs increased radially from pith to cambium with the greatest change being associated with the wood nearest the pith. The low stiffness at the base of the tree suggests that an alternative log bucking strategy should be considered, namely cutting a short 2.4–2.7 m butt log for plywood/LVL or for bolter sawing and only cutting standard length logs above this point.The least stiff logs (lowest 20%) yielded lumber that had an average stiffness that was over 1 GPa less than the average for the population. A case can be made for separating these logs and processing them differently.     

原木检尺进位方法对木材规格和材积的影响分析

通过随机抽取 316根原木 ,分别采用国家标准原木检尺方法与南方一些地区实际使用的原木检尺方法进行计算、比较和分析 ,认为不标准的原木检尺进位方法降低了木材规格和材积 ,损害了林农和国家利益 ,干扰了林业资源管理工作     

增城北部三镇乡村景观生态建设探讨

在人们日益向往乡村田园风光、渴望回归自然的当代社会,乡村作为人与自然接触最为密切的地理区域,如何在景观建设过程中,保持其原有人文特色和自然生态,同时实现一定的经济效益具有重要意义。本文以广东省广州增城北部三镇乡村景观生态建设为例,分析乡村景观的生态特征,探讨乡村景观生态规划建设的原则与方法。     

Prediction of Board Values in Pinus sylvestris Sawlogs Using X-ray Scanning and Optical Three-dimensional Scanning of Stems

As the sawmill industry strives towards customer orientation, the need for sorting of logs according to quality has been recognized, and automatic sorting based on measurements by three-dimensional (3D) optical log scanners has been implemented at sawmills. There is even a small number of sawmills using the X-ray log scanner for automatic log-sorting. At the log-sorting stage, the potential of the raw material to fulfil the needs has already been reduced by the decisions taken when the trees were bucked (cross-cut) into logs. Thus, the application of predictions of the boards’ properties at the bucking stage is desirable. This study investigates the possibility of predicting board values from logs based on 3D scanning alone and 3D scanning in combination with X-ray scanning of stems. This study is based on 628 logs scanned by computed tomography that make up the Swedish Pine Stem Bank. Simulated sawing of the logs gave product values for each log. Prediction models on product value were adapted using partial least squares regression and x-variables derived from the properties of the logs and their original stems, measurable with a 3D log scanner and the X-ray LogScanner. The results were promising. Using a 3D scanner alone, R ² was 0.68, and using a 3D scanner in combination with an X-ray LogScanner, R ² was 0.72.     

中国苏铁属植物保护现状与展望

自身致濒因子及人类影响适宜生境锐减,是中国苏铁属植物面临的主要威胁。在加强自然保护区和迁地保护等工作的同时,开展苏铁发育生物学和人工快繁技术的研究,特别是在人工繁殖和组织培养的辅助下补种和恢复其种群个体数和建立好的群落,是苏铁种质资源保护与开发利用的有效途径。