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机械制造设备是机械制造业的载体,是技师学院机械专业学生毕业后接触的主要生产工具,产品的加工质量与设备的使用、维护、保养等管理方法密切相关。机械制造设备管理已经成为现代制造企业中的一项重要工作。本文将介绍机械制造设备管理的基本理念,机械制造设备的使用、故障与维护,进而丰富“机械制造装备及设计”课程的学习内容。 相似文献
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机械图样是机械工程技术人员的通用语言,《识图与制图》课程在工程技术人员素质培养上具有极其重要的作用,该课程是高职院校机械制造大类的专业基础平台课程,以往教学评价方法单一。文章主要根据工匠精神主导思想探索多元的教学评价方法,创新课程评价模式,增加过程评价及以赛促评等评价方法,力争保证教学效果、实现教学目标、增强高职院校学生的职业能力。 相似文献
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现阶段的高职机械制造专业从根本上是模拟普通高校的相似专业建立起来的,既要像普通高校机械制造专业一样不断更新扩大专业知识点,也要为国内机械制行业不断输出技术高端人才。为了同时满足这两方面的需求,高职院校对机械制造专业做出了教学改革,摸索出了适应教学的新模式。 相似文献
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为培育“中国制造2025”发展战略所需的高素质工程科技人才，针对机械工程类本科专业《机械制造基础》和《金属工艺学》两门专业基础课程的教学状况及存在不足，以景德镇陶瓷大学为例，基于高等工程教育专业认证，大力开展《机械制造基础理论及实践》教学改革和创新。该课程综合了原有《机械制造基础》和《金属工艺学》课程的知识架构和实践体系，注重理论教学与实践训练的有机结合。教学改革实践结果表明，优化整合了教学内容，改进了教学方式，为后续专业课的学习奠定了基础，为机械工程类及近机械类本科专业的基础课程教学实践提供了有益借鉴。 相似文献
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现代制造业和现代职业教育的发展对技能人才的要求越来越高,职技校是培养技能人才的摇篮,传统教学和现代教学产生了矛盾,促进了课程教学的改革。《车工工艺与技能训练》是机械制造类专业的基础课程,对车工加工起到指导作用,但对于新接触的学生来说,该课程内容抽象、难以理解。导致该课程成为学生最厌学的科目之一。面对这样的问题,作者结合多年经验总结出如何让学生学好《车工工艺与技能训练》这门课。 相似文献
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目前,世界正处于经济与科技飞速发展时期,很多技术得到了优化,人们开始重视新技术的研发。经济发展对工业的巨大需求要求人们不断地革新技术,使用新工艺达到节省成本、提高效率的目的。机械制造是工业的主体和灵魂,发展机械工艺的新技术成为各机械制造企业的重中之重。文章研究了机械制造工艺新技术的应用现状,提出了机械制造工艺新技术发展趋势的猜想。 相似文献
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文章阐述了《单片机应用技术》课程教改实施的意义、思路及方案,总结了这门课程的教改特点、创新及取得的成果,并对在教改实施过程中碰到的问题进行了反思. 相似文献
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在"工学结合"原则的指导下,文章以汽车检测与维修专业《发动机构造与维修》课程为实验蓝本,明确该课程的教学目的,分析项目导向教学法在该课程中的应用优势,并就该课程在教学中如何实施项目教学法进行探讨,旨在构建良好的学习环境和培养高素质实用型人才. 相似文献
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Hans-Dieter Seelig Alexander Hoehn Louis S. Stodieck David M. Klaus William W. AdamsIII William J. Emery 《Irrigation Science》2009,27(5):357-365
Plants with different abilities for osmotic adjustment (cowpea, bean, and sugarbeet) were subjected to gradually decreasing
soil water content. During the development of water deficit stress, various plant water parameters were measured to characterize
their relationship to the near infrared R
1300/R
1450 leaf water index, which is based on the measurement of light reflected from leaves. In all three species, leaf water thickness
(LWT), leaf cell relative water content (RWC), and overall leaf thickness remained relatively constant under moderate water
deficit stress. However, at the point when plants could no longer cope with the increasing level of water deficit stress,
LWT, RWC, and leaf thickness were found to decrease substantially, signaling the onset of leaf dehydration. The R
1300/R
1450 leaf water index followed the RWC very closely in cowpea and bean leaves, and with some time lag in sugarbeet leaves. The
R
1300/R
1450 index may therefore be used as a feedback-signal in precision irrigation control, signaling effectively the physiological
response of plants when water deficit stress becomes detrimental. RWC and the R
1300/R
1450 index were linearly correlated in cowpea and bean leaves, but not in sugarbeet leaves. 相似文献
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Available water is one of the most limiting factors in crop production. As current methods for the determination of plant
water content are time-consuming and require numerous observations to characterize a field, managers could benefit from remote
sensing techniques to assist in irrigation decisions and further management practices. Adoption will depend on the development
of technologies, which allow real time sensing of the soil and plant water status and the discrimination of several stress
factors. A greenhouse study was initiated to determine specific wavelengths and/or combinations of wavelengths indicative
of water stress in wheat and to evaluate these wavelengths for discriminating water stress from other biotic stresses. Reflectance
of wheat leaves from plants grown under six different water treatments ranging from 65 to 26% field capacity was determined
once a week from the beginning of the fourth leaf stage until the sixth leaf stage. Reflectance measurements were performed
at the fourth leaf of wheat plants with an imager (LEICA S1 Pro) under controlled light conditions. Reflectance was measured
in different wavelength ranges throughout the visible and infrared spectra (380–1,300 nm). Leaf scans were evaluated within
the L*a*b*-color system. Total water content of wheat leaves was calculated after the difference between total fresh and total dry
weight of wheat plants. Significant reflectance changes and correlations between water status and leaf reflectance were obtained
at a water content <71% and enabled the identification and quantification of water status of wheat plants. Reflectance patterns
at 510780, 540780, 4901,300, and 5401,300 nm were found most suitable to describe to the water status regardless of the sampling date or growth stage. To evaluate
the validity of leaf reflectance as a method for separating water stress from other biotic stresses such as nutrient deficiencies
reflectance pattern of water deficient plants were compared with reflectance patterns of N, P, Mg, and Fe deficiency obtained
in earlier studies by calculating the color distance ΔEab as additional reflectance parameter. ΔEab increased under different nutrient deficiencies, but remained constant under water stress, thus enabling the discrimination
of the investigated stress factors. The approach indicated that various stress factors could be clearly identified by reflectance
measurements, thus enhancing a better plant management by the use of remote sensing techniques. 相似文献
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文章通过分析当前《电气控制与PLC技术》课程的具体教学情况,提出在课程中采用项目式驱动教学的必要性和重要性,以期积极探索出项目式驱动教学在《电气控制与PLC技术》课程中有效应用的具体对策,最终达到解决当前教学中所出现的普遍问题,并通过增加实践环节,提高学生的学习兴趣以及动手能力,进而获得更好的教学效果. 相似文献
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Tamara Begdullayeva Kirsten M. Kienzler Elena Kan Nazar Ibragimov John P. A. Lamers 《Irrigation and Drainage Systems》2007,21(3-4):237-250
Water and land salinization, caused by ill-practiced irrigation and drainage is acute and widespread in Karakalpakstan, Uzbekistan.
A crop frequently grown in these marginal areas is sorghum because of its capability to adapt to saline conditions. However,
the salt uptake potential of local varieties for salt-ameliorative purposes, as well as possible income-generation benefits,
have not yet been studied. Therefore, field experiments on low, medium and highly saline soils were conducted using four sorghum
cultivars (S. vulgare, S. cernuum, S. durra, and S. technicum). The effect of soil salinity on biomass, stover and grain yield, the baking and feed quality, and total water soluble salt
(TDS) accumulation, was assessed according to varieties, plant fractions and growth phases. Results showed that S. cernuum had the highest grain yield on the low (5.13 t ha−1), medium (6.05 t ha−1) and highly (3.3 t ha−1) saline soil. S. technicum showed the lowest growth potential under all salinity levels. TDS accumulation varied between 406 and 185 kg ha−1 depending on variety, site, plant fractions and growth stage. Irrespective of the soil salinity levels and varieties, TDS
was highest in stover and leaves, while highest TDS uptake, mainly chlorides and bicarbonates, occurred between booting and
flowering. Baking quality of all varieties was extremely low, whereas the in-vitro feed was assessed as of medium quality.
The findings indicate the scope of local sorghum varieties for phytomelioration of marginal lands in Karakalpakstan, while
concurrently satisfying a wider range of rural livelihood needs. 相似文献
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When using saline waters, sprinkling irrigation at night is a recommended practice to reduce evaporation, salt absorption
by the wetted leaves and its negative effects on crops. We measured shoot ion concentrations (Cl−, Na+ and K+) and total dry matter (TDM) in alfalfa subject to diurnal and nocturnal saline sprinkler irrigations and established potential
relationships among them. The work was carried out along the 2004–2006 growing seasons using EC waters from 0.5 to 5.6 dS m−1. Saline sprinkling irrigations linearly increased shoot Cl− and Na+ and decreased shoot K+. Even though daytime evaporation was much higher than nigh-time, shoot ion accumulation and TDM were similar in the diurnal
and nocturnal irrigations. The salinity tolerance of alfalfa decreased in year 2006 due to increases in shoot Cl− and, particularly, shoot Na+. The lower threshold for shoot Na+ (276 meq kg−1) than for shoot Cl− (726 meq kg−1) shows that alfalfa is more sensitive to Na+ than to Cl−, and that Na+ accumulation is the preponderant cause of alfalfa yield decline after 3 years of sprinkling with saline waters. 相似文献
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"学做教"合一人才培养模式的切入点是自主学习、自我教育,在有组织的开展实践应用教育的同时也注重培养学生素质的教育,其目的是为了培养学生在职业生涯或终身发展中具备可持续发展能力的高技能专业应用型人才.在高职院校开展"学教做",可以有效提高高职院校的教学质量. 相似文献