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木材生产经营的新尝试──关于广东省国营西江林业局拍卖青山的调查江祖森木材生产、销售是国有林场的一项重要的生产经营活动。广东省国营西江林业局每年生产销售木材7万多立方米,木材生产支出占林场总支出的30%多,销售收入占自筹总收入的80%。按传统的木材生产... 相似文献
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从系统总体设计、功能分析及数据库建立等方面,介绍木材生产销售管理系统的研究与开发.系统具有数据输入、查询、统计、分析、打印、结帐等功能,能科学、快捷、有效地管理木材生产销售过程中的各类数据,提高工作效率. 相似文献
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6月份酷暑降临,传统上的生产建设也到了一年之中时间过半、任务过半的高潮档口。北京城地区的木材市场此时的确也已经进入了夏季销售阶段。探访京城及周边地区一些大大小小的木材市场,总体印象是令人喜忧参半,明显感觉夏初季节销售优势已然充分体现出来,首先是木制原材料市场需求明显日渐强劲,销售速度加快。与此同时,木材价位不断飘忽上扬。令买卖双方都 相似文献
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蓝樟仁 《中南林业科技大学学报(自然科学版)》1990,(2)
本文以采运系统的内部结构为出发点,应用系统动力学原理和方法,建立了采运系统木材生产动力学模型。说明在木材销售活动这一随机因素干扰下的库存策略的动态变化,是木材生产整个系统行为波动的最主要的放大源。提出了有目标指导下的体现存在策略的具体参数。通过对实际系统多种生产方案进行模拟仿真,表明该模型能够找出最佳方案,作为生产决策的依据。 相似文献
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2000年10月,洪江市托口镇新田村民委员会为筹措资金进行农网改造,经集体研究,决定以8.5万元的山价出售本村泥鸡冲集体杉林,并于同年11月向社会进行公开拍卖,因木材商最高只能出3.6万元,故拍卖不成功。该村领导认为山上杉木绝对不只这个价,于是第2天组织人员上山点蔸量径级,经统计共有杉树3781株,估计有400多立方米木材。按保护价计算,约合5.59万元,村里决定以5.6万元山价出售。2001年3月3日木材商杨某(系该村村民,已判刑)找到村主任、村支书、会计,答应以5.6万元山价购买,但在某酒家协商时,杨某提出要该村出具真、假两份销售… 相似文献
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本文介绍了木材生产、销售微机管理系统的主要功能和实际操作运用技术,将微机运用于木材进出仓材积、价格、金额的计算、码单和销售表的打印,比人工借助简单计算器计算提高工作效率5~10倍,完全避免了木材进出仓计算的差错和损失。 相似文献
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The shortened fallow period in traditional slash and burn agriculture of the Maya of Quintana Roo, Mexico, has reduced soil
fertility, crop yields, biodiversity, and mature forest vegetation. Studies have shown that agroforests that mimic local ecosystem
processes can be used to provide for the farmers' well-being while protecting and preserving forest resources and biodiversity.
The objective of this investigation was to identify, describe, and evaluate Mayan crop plants that could be used as analog
species in agroforest design. We used participant observation, interviews with farmers, and field measurements to collect
information on the social, agricultural, and ecological aspects of the plants. We identified five horizontal and one vertical
strata in mature homegardens: the herbaceous stratum, the low shrub stratum, the tall shrub stratum, the fruit tree stratum,
the timber tree stratum, and the viny stratum. We categorized 77 forbes, shrubs, and vines identified for their temporal and
spatial placement in an agroforest. The plants evaluated can be placed in one of the four developmental stages of an agroforest:
the herbaceous stage, and the shrub stage, the fruit tree stage, and the timber tree stage. By using the identified plants
and the analog hypothesis, we can design an agroecological system that provides for the farmers' needs, and efficiently utilizes
the resources on-site for the production of food, timber, medicinal plants, and nontimber products in a manner that protects
the natural resource base of the region.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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贮木场空间管理系统的初步研究 总被引:1,自引:0,他引:1
传统的贮木场木材信息管理仅限于产、销、存等基本的功能,本文研究的贮木场空间管理系统是在传统的贮木场管理系统基础上,通过对贮木场平面图道路、楞区的划分以及合理地划分楞位大小。采用可视化图形方式对楞位和楞位中存放的木材进行管理,以提高贮木场楞区空间利用率,简化仓储业务操作,实现高效直观的贮木场仓储管理。 相似文献
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木材内部腐朽特征识别专家系统 总被引:4,自引:4,他引:0
简单介绍了专家系统在林业上的应用 ,详细阐述了木材内部腐朽特征识别专家系统的设计过程。该系统可以为合理造材 ,提高木材的经济价值提供依据。 相似文献
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带锯制材的第一道工序就是裁板皮,数控带锯机的裁板皮过程必须进行软件设计,而软件设计的基础是数学理论的建立,提出板皮裁边的数控加工数学模型、仿真加工过程,为板材最优下锯提供计算机编程方程,为视频再现提供数学方法,为板皮锯切、板皮材积精确检测提供理论依据,为数字化控制提供理论.通过数控技术与现代制材工艺结合,将使传统木材加工工艺数控化,可以推进木材工业加工过程中计算机数学描述研究的发展,推进木材工业加工过程数学描述研究理论的开展. 相似文献
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为进一步开发木材在工程材料中的应用,本文从木桥的系统进展及规划设计、木材设计特性、木材防腐、用于运输系统中的木结构、木桥检测及修复、木桥设计规范及计算机辅助设计6个领域综述了美国木桥近期研究状况及进展 相似文献
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In the previous report of this ongoing study, results of an extensive field survey were collated and a theoretical model was
proposed to predict the mechanical behavior of timber shear walls of traditional design in Taiwan. The initial objective of
the present report was to propose a simplified calculation method for estimating the initial stiffness and yield strength
of traditional timber shear walls. Based on the results of the field survey, a total of 15 full-scale specimens were tested
to verify the theoretical model and simplified calculation proposed previously. Good agreement was found from comparison of
analytical and experimental results. The results of this study show that the friction behavior between board units and beams
plays the major role in resisting the lateral force applied on the timber shear wall, followed by the resistance supplied
by embedment. The resistance provided by bamboo nails is minor due to the small section. Another trend found was that for
set dimensions of a timber shear wall, the board width can be increased to obtain higher stiffness and strength of the shear
wall. 相似文献
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Semi-rigidness of the joint connections is one of the main characteristics of timber structures. The pin-joint assumption for the semi-rigid joint connections might be not conservative in the timber structural design. In this paper, structural analysis was conducted on a semi-rigid timber portal frame; the formulas were derived in terms of the internal force and the lateral stiffness, and the influence of the semi-rigid connections was discussed. Moreover, experimental tests were performed on three full-scale timber portal frames and five bolted timber connections to study the lateral performance of the frames and the moment resistance of the connections. For consistency, the connections from the portal frames and the connections for bending tests were of the same configuration. Finally, a calculation flowchart of the lateral performance on a semi-rigid frame was presented to verify the derived formulas and to show a framework of the lateral structural design process. 相似文献