关键词： 草坪   割草机   试验   安全措施   园林机械   柴油机   内燃机  

标准号: GB 26509-2011

摘要： 本标准规定了以汽(柴)油机为动力的步进式草坪割草机的术语和定义、安全技术要求和试验方法、使用说明书和标识。 本标准涉及的应消除或降低危害程度的一些重大危险列于附录A 中。 本标准也适用于以其他内燃机为动力的步进式草坪机的对应部件,也适用于除乘人附件外的拖乘式草坪机。 本标准不适用于坐骑式草坪机,也不适用于切割部件为非金属柔线或自由定心式非金属切割器、每个切割部件的切割能量(动能)不大于10J的草坪机。

关键词： 工程机械   业绩   每股收益   净利润   年报  

摘要： 潍柴动力（000338）2011年3月31日发布年报。年报称，2010年公司营业总收入为632．80亿元，利润总额92．45亿元。归属于母公司股东的净利润67．82亿元。基本每股收益4．07元。

关键词： 中国航天科技集团公司   机械厂   西安   专业技术人员   航天企业   固定资产   机械加工   旋压加工  

摘要： 中国航天科技集团公司第四研究院西安航天动力机械厂（7414厂）是一个军民结合、寓军于民的航天企业，始建于1969年，拥有固定资产3．2亿元，员工1600人；其中研究员16人，国家特级技师4人，各类专业技术人员312人；设有机械加工、钣焊、热处理、工模具等专业车间；拥有旋压加工、精密加工、数控加工等多个专业加工中心；还有化工容器、换热器、蒸压釜、

关键词： 农机总动力   灰色理论   预测  

摘要： 农业机械总动力预测是农业机械化科学管理的重要内容。为此,运用灰色系统理论GM(1,1)模型,对1998-2008年陕西省农业机械总动力进行了相关检验,模拟了陕西省农机总动力发展情况,相对误差均小于3%,平均误差为1.01%,模型可用于农机总动力预测。预测结果表明:2011-2015年陕西农业机械总动力分别为19 570,21 687,2 3932,26 315,28 843kW,呈直线上升趋势,年平均递增率为9.48%。

关键词： 机械动力学   学术会议   中国   征文   工程学   振动  

摘要： 由中国振动工程学学会主办的“2011中国机械动力学学术会议”将于2011年7月29—31日在杭州召开。

关键词： 工程机械行业   东方红柴油机   动力元件   上海新国际博览中心   宝马   展放   品牌   亚太地区  

摘要： “上海宝马工程机械展”是世界最大的工程机械展bauma在中国的延伸，同时也是2010年亚太地区最具影响力的国际性行业博览会。bauma China2010暨第5届中国国际工程机械、建材机械、工程车辆及设备博览会于2010年11月23—26日在上海新国际博览中心召开。

关键词： Oxygen   Diffusion   Oxidation kinetics   Ascorbic acid   Mechanistic model   Sensitivity study  

摘要： A mechanistic model was developed taking into account both oxygen and ascorbic acid transfer phenomena and oxidation reaction of ascorbic acid. Studied system was cylindrical agar gel initially spiked with ascorbic acid and exposed to air on one face. This model describes oxygen and ascorbic acid diffusion (using Fick's law) and ascorbic acid oxidation rate. A sensitivity study showed that partial order of reaction with respect to oxygen was the critical factor in this model coupling transfer and reaction phenomena. This model has been validated at 20 degrees C using local measurements of ascorbic acid and oxygen contents in agar gels, and also using average ascorbic acid content, both type of data having been measured at different sampling times. It was shown that the reaction occurred at a significant extent only near from the interface air/gel, i.e. the part of the gel near from the interface air/gel contained high level of oxygen and low level of ascorbic acid, whilst the part near the other extremity of the gel contained high level of ascorbic acid and low level of oxygen. This model could be a useful tool to precisely locate the zone in a solid food submitted to oxidation, to determine which reactant and which phenomenon (diffusion and/or reaction) is rate limiting and consequently to assess better designs for strategies of protection against oxidation. (C) 2010 Elsevier Ltd. All rights reserved.

关键词： Labial interruption   Mechanical interruption   Subglottal pressure   Laryngeal airflow   Laryngeal resistance  

摘要： Objectives/Hypothesis. To directly compare the mechanical and labial interruption techniques of measuring subglottal pressure (P(s)), mean flow rate (MFR), and laryngeal resistance (R(L)). Methods. Thitty-four subjects performed 10 trials with both mechanical and labial interruption. P(s) and MFR were recorded, whereas R(L) was calculated by dividing P(s) by MFR. Coefficients of variation were calculated to compare intrasubject precision. A subset of 10 subjects performed the tasks twice with 30 minutes between sessions. Bland-Altman plots were used to determine intrasubject repeatability for each of the methods. Results. Mechanical interruption produced coefficients of variation for P(s), MFR, and R(L) of 0.0995, 0.127, and 0.129, respectively. Labial interruption produced coefficients of variation of 0.102, 0.147, and 0.169, respectively. P values were 0.824 for P(s), 0.159 for MFR, and 0.043 for R(L). The Bland-Altman plots revealed comparable repeatability between the two methods. The 95% confidence intervals of the Bland-Altman plots for mechanical interruption were (-0.050, 0.072), (-0.543, 1.832), and (-2.498, 10.528) for MFR, P(s), and R(L). Confidence intervals for labial interruption were (-0.018, 0.031) (0.057, 2.442), and (-3.267, 10.595) for MFR, P(s) and R(L). Conclusions. Mechanical interruption produced higher precision when measuring R(L) because of more reliable airflow measurements. Mechanical and labial interruption showed comparable repeatability. Further research into using mechanical interruption clinically is warranted.