共查询到19条相似文献，搜索用时 578 毫秒
1.
开展职业院校园林CAD综合实训新模式的探索与实践,对推动学校教学改革、提升学生绘图能力具有一定的现实意义。文中通过分析基本情况,从设计实训任务、准备实训资源、建设线上课程、组织分步实施4个方面介绍了组织园林CAD综合实训的具体方法。按照提升技能、开展调查、制作图块、绘制图纸、提交报告的逻辑顺序,详细介绍了实训开展的组织过程。创新性地提出基于校园环境开展园林CAD综合实训,基于工作任务打破课程界限,解决了疫情防控、学生安全等方面存在的问题,突破了学生在植物种类识别、学科有机融合、操作技能提升等方面的难点,为全面实现训练目标创造了条件。 相似文献
2.
糖厂装置主要以设备和管线为主,管线类型及规格多,管道布置相互交叉,尤其是澄清加热蒸发车间,管道走向极为复杂。在糖厂设计过程中,传统的AutoCAD二维辅助设计存在着效率低下、局部管道设计困难、管道易碰撞等缺点,而三维辅助设计可以直观、逼真的反映车间的空间效果,进行碰撞检查,从而优化工程设计,优化净空和优化管线布置,并能降低管道设计难度,提升工程图纸质量和出图速度。目前,国外糖厂设计三维辅助设计技术已较为成熟。而我国的糖厂三维设计只有个别案例,文章以国内某糖厂澄清加热蒸发车间设计为例,详细提供了糖厂基于AutoCAD Plant 3D的三维辅助设计的主要思路、设计优势及存在的难点,并简要说明了国内糖厂三维辅助设计的发展趋势。 相似文献
3.
4.
茶叶包装图像设计从二维空间逐渐发展成三维或者多维空间,既符合了设计创新的需求,又顺应了新时代科技、人文、市场经济快速发展的趋势。通过分析茶品包装平面设计中图像发展现状与跨维平面表现成因,阐述了图像设计的视觉效果、空间美学与心理需求等方面相关内容,探讨茶叶包装图像跨维化发展的表现形式和功能性,并具体分析了其市场需求和实施措施。增进人们对图像设计的了解,对三维模式下的设计产生新的认知度。 相似文献
5.
6.
为研究棉花主要生育时期的土壤含水量时空变异及其可视化方法,使用Voxler软件进行三维可视化绘图,分析了花铃期（7月10－19日）棉花单作、棉花/二月兰、棉花/苕子3种模式下土壤含水量时空分布特征。结果表明,利用Voxler软件对数据处理分析进行三维可视化表达,可更加直观准确地掌握整个棉田土壤含水量的时空分布及其变化;该时段3种种植模式的土壤含水量以棉花/苕子最高,棉花/二月兰次之,单作棉花最低,且均为底层高于表层。 相似文献
7.
为研究棉花主要生育时期的土壤含水量时空变异及其可视化方法，使用Voxler软件进行三维可视化绘图，分析了花铃期（7月10－19日）棉花单作、棉花/二月兰、棉花/苕子3种模式下土壤含水量时空分布特征。结果表明，利用Voxler软件对数据处理分析进行三维可视化表达，可更加直观准确地掌握整个棉田土壤含水量的时空分布及其变化；该时段3种种植模式的土壤含水量以棉花/苕子最高，棉花/二月兰次之，单作棉花最低，且均为底层高于表层。 相似文献
8.
基于已有的特征指标及组合指标,对苎麻和涤纶纤维的各特征指标进行“组合对”识别与分类及其边界确定。利用“组合对”参数二维解析边界函数划分和判定方法,实现了计算机图像处理对麻/涤混纺纱混合比的精确、有效地计算,混纺比与实际比较绝对误差在3%以下,相对误差在5%以下。研究表明本文提供的方法更具有纤维识别的直观准确性和有效性,并可实用和标准化。 相似文献
9.
基于已有的特征指标及组合指标,对苎麻和涤纶纤维的各特征指标进行"组合对"识别与分类及其边界确定.利用"组合对"参数二维解析边界函数划分和判定方法,实现了计算机图像处理对麻/涤混纺纱混合比的精确、有效地计算,混纺比与实际比较绝对误差在3%以下,相对误差在5%以下.研究表明本文提供的方法更具有纤维识别的直观准确性和有效性,并可实用和标准化. 相似文献
10.
11.
Fabric or foam sheet moulding is an important manufacturing technique for the apparel industry, in particular for bra production.
It is the most economical and convenient method to seamlessly form a garment part into a specified 3D shape. This paper proposes
an example-based method for designing moulded bra cups. In this study, a total of 10 typical moulded bra cup specimens were
scanned using the Steinbichler Comet white light scanner. Parameterization based remeshing and registration algorithm was
used to characterize the 3D shapes of the convex surface of the scanned bra cups. Using an example-based method, virtual master
moulds were constructed based on the 3D surfaces of the investigated bra cups after eliminating the style lines and size differences.
Then a new bra cup design can be developed from the master mould, either by drawing the style lines in the virtual environment
or using scissors to cut the moulded plastic shot along the desired style lines. Different sizes can also be made by grading
the wire frame model in 3D manner. The present method will provide a scientific tool for the product development of new bra
cups which was conventionally very time-consuming and ineffective. 相似文献
12.
Eun Hee Gang Chang Seok Ki Jong Wook Kim Jonghwan Lee Bum Gyu Cha Ki Hoon Lee Young Hwan Park 《Fibers and Polymers》2012,13(6):685-691
In this study, a three-dimensional (3D) poly(lactide-co-glycolide) (PLGA) microfibrous scaffold with high porosity (ca. 90 % porosity) was developed for evaluating its performance in tissue engineering application. A dope solution of PLGA/polyethylene oxide (PEO) blend was electrospun into a methanol coagulation bath for fabricating highly porous 3D PLGA scaffold and a salt leaching method was used for making interconnected pores of 100?C200 ??m size inside the scaffold. The morphological structure, pore size and porosity of the microfibrous scaffold were determined, and compared with twodimensional (2D) mat-type and 3D sponge-type of PLGA scaffold. Also, swelling ratio, water uptake and compressive strength were compared in order to elucidate the structure-property relationships of different types of the scaffolds, especially in a wet condition. As a result of scanning electron microscopy (SEM) observation, normal human dermal fibroblasts (nHDF) were migrated, attached, and proliferated well inside the 3D scaffold. MTT assay confirmed that the highly porous 3D PLGA microfibrous scaffold had superior cell adhesion and proliferation abilities due to fibrous structure of large specific surface area, and interconnected pore structure. Therefore, this high performance 3D PLGA scaffold can have a high potentiality for application in tissue engineering in comparison with conventional PLGA scaffolds. 相似文献
13.
Cells behave differently between bidimensional (2D) and tridimensional (3D) environments. While most of the in vitro cultures are 2D, most of the in vivo extracellular matrices are 3D, which encourages the development of more relevant culture conditions, seeking to provide more physiological models for biomedicine (e.g., cancer, drug discovery and tissue engineering) and further insights into any dimension-dependent biological mechanism. In this study, cells were cultured between two protein coated surfaces (sandwich-like culture). Cells used both dorsal and ventral receptors to adhere and spread, undergoing morphological changes with respect to the 2D control. Combinations of fibronectin and bovine serum albumin on the dorsal and ventral sides led to different cell morphologies, which were quantified from bright field images by calculating the spreading area and circularity. Although the mechanism underlying these differences remains to be clarified, excitation of dorsal receptors by anchorage to extracellular proteins plays a key role on cell behavior. This approach--sandwich-like culture--becomes therefore a versatile method to study cell adhesion in well-defined conditions in a quasi 3D environment. 相似文献
14.
The woven fabric graphics designed with available computer aided design (CAD) systems using different colored warp and weft
yarns look quite different from the appearance of their actual fabrics. To enhance the visual effects of designed woven fabric
graphics, this paper reports a modified CAD woven fabric system, which allows users to design a fabric using parameters including
fabric weaves, yarn number, yarn material, fabric count, crimp shape of interwoven yarns, and illumination. This enhanced
system can design both yarns and fabrics, and consider the transitional color effect around interweaving points of warp and
weft yarns. Its simulation image quality of woven fabrics has been greatly improved, and several textile mills and universities
are currently using this woven fabric design system. 相似文献
15.
The basic aim of the sprinkler irrigation method, as in other irrigation methods, is to apply irrigation water as uniformly as possible to the root zone. The uniform distribution of the applied water in sprinkler irrigation depends on factors such as sprinkler type, number and size of nozzles, arrangement of sprinklers, working pressure and the speed and direction of the wind. Sprinkler and lateral spacing should be determined by also taking the speed and direction of the wind into consideration. The aim of this study was to determine the application limits and the curves of water distribution under different working pressures, spatial arrangement and nozzle diameters under field conditions of some irrigation sprinklers which are widely used in Turkey. The objective was to determine the most appropriate system arrangement by using a computer program called CATCH3D. Five sprinklers were tested in the experimental area of Ondokuz Mayis University Campus and their water distribution characteristics identified. The most suitable operating parameters for Bereket 3: 12 x 18 m, Bereket 2: 12 x 18 m, Egeyildiz 6 x 18m, Goktepe 6 x 12 m and for Atesler sprinkler 12 x 18 m arrangement type were determined. 相似文献
16.
氮密互作对淮北砂姜黑土区冬小麦冠层光合特性和产量的影响 总被引：1，自引：0，他引：1
为筛选出适合淮北平原砂姜黑土区小麦稳产高产栽培的氮密配置,在大田条件下以安农0711(AN0711)和烟农19(YN19)为试验材料,采用裂区设计,设置150×10~4、210×10~4、270×10~4和330×10~4株·hm~(-2)4个种植密度(分别用D1～D4代表),以及135、180、225和270 kg·hm~(-2)4个施氮水平(分别用N1～N4代表),分析了氮密互作对冬小麦冠层结构、光合特性和籽粒产量的影响。结果表明,氮密互作可改善小麦冠层结构,显著影响冠层光合特性。旗叶净光合速率和叶绿素相对含量随着种植密度的增加而降低,而随着施氮量的增加而增加,但施氮量超过225 kg·hm~(-2)时变化均不显著。随着种植密度和施氮量的增加,叶面积指数和冠层截获光合有效辐射显著提高,且在孕穗期和开花期均以D4N4处理最大,灌浆中期均以D3N3处理最大。氮密对籽粒产量有显著的互作效应。在D3N3处理下AN0711和YN19的冠层光合能力和籽粒产量均最高,其中产量分别达到7 866.67和7 400.00 kg·hm~(-2)。在本试验条件下,适宜的种植密度和施氮量分别为270×10~4株·hm~(-2)和225 kg·hm~(-2)。 相似文献
17.
Tight-fitting clothing pattern reflecting the accurate information of the 3D body shape has been one of the challenges for
garment industry, however, fitting problems still exist. The objectives of the paper is to develop a 2D pattern which fits
tightly to the 3D human scan data for sports suits that need comfort and function for maximum performance. In this study,
the user graphic interface application software for the semi-automatic garment pattern generation has been implemented using
the triangle simplification scheme together with 2D projections of free-falling of 3D surface polygons keeping the original
3D surface area preservation. A typical application of the developed pattern to the functional body suits is presented and
verification of the proposed method is also provided. 相似文献
18.
19.
甘蔗在中国糖料生产中占重要地位，甘蔗叶是一种储量巨大且亟待开发利用的生物质能源，具有很好的开发利用价值。然而，目前对甘蔗叶生物力学特性方面的研究尚缺乏有效的研究理论与方法。本研究引入新兴的农业生物力学研究理论，结合工程学、生物学、工程力学和工程材料学的基本原理与方法，研究甘蔗叶拉伸力学性能、甘蔗叶剪切力学性能、甘蔗叶力学性能，为研究甘蔗叶的生物力学特性寻找到有效的研究理论与方法，为甘蔗叶粉碎还田、甘蔗叶沼气利用预处理机械，以及甘蔗剥叶、收获等机械的研究开发、优化设计、计算机仿真及智能化提供参考。 相似文献