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邓军 《江西农业大学学报》2000,22(3):461-464
针对当前要械设计领域最常用的CAD软件平台AutoCAD二次开发工具AutoLISP、ADS和ObjectARX进行全方位比较,提出AtuoCAD二次开发工具的使用应该建立在所开发的对象及结合企业自身情况的基础上。 相似文献
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Elizabeth A. Clubbs Elena Vittadini Thomas H. Shellhammer Yael Vodovotz 《Journal of Cereal Science》2008
Corn tortillas have a short shelf life due to increased firmness and microbial spoilage. Commercial corn tortillas use carboxymethyl cellulose (CMC) to delay staling; however this gum is expensive when compared to the rest of the tortilla ingredients. Glycerol has been added to bread and wheat tortillas to increase pliability and salt has been shown to mask the flavor of glycerol in corn tortillas. The possibility to reduce staling in corn tortillas by adding glycerol/salt as an alternative to CMC was investigated by monitoring changes in physico-chemical properties during 2 weeks of storage at 25 °C. Molecular and macroscopic changes were followed using thermal and mechanical analysis. During storage an increase in amylopectin recrystallization was observed in all samples. The “freezable” water content of all tortillas decreased over the first 3–5 days of storage with an increase after 7 days, while moisture content and water activity remained constant. Glycerol/salt tortillas exhibited a sharper transition region in the DMA temperature scan suggesting a more homogenous sample. CMC tortillas were significantly stiffer than glycerol tortillas after 14 days of storage. Glycerol/salt combinations may offer at least a partial replacement for CMC since it helped control the stiffness, water homogeneity and distribution during storage. 相似文献
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L.S. Faudskar DVM M. R. Raffe DVM MS D. A. Randall BS D. R. Bing BS RRT 《Journal of Veterinary Emergency and Critical Care》1997,7(1):49-58
A laboratory evaluation was performed to evaluate the performance characteristics of a new veterinary ventilator. The ventilator studied was configured according to manufacturer's directions and attached to a test lung via a pneumotachograph and differential pressure transducer interfaced to a pulmonary mechanics analyzer system. Constant resistance (R=10 cm H2 O/L/sec) and compliance (C=3 ml/cm H2 O) factors were maintained for all trials. The ventilator operated at the manufacturer's preprogrammed parameters. In the first trial, body weight was the only variable. In the second trial, an endotracheal tube was placed in series between the ventilator's breathing circuit and the pneumotachograph. Body weights from 1–20 kgs were evaluated. Mean values for respiratory rate (RR), minute ventilation (VE), inspiratory time (Ti), peak inspiratory pressure (PIP), and peak inspiratory flow (Fpki) displayed on the ventilator control panel; tidal volume (VT), calculated from the displayed minute volume, and identical parameters measured by the pulmonary mechanics system at each body weight, were compared using a two factor analysis of variance. Significant differences (P< 0.05) were found between mean displayed and measured values for RR, PIP, and Fpki. 相似文献
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Archana A. Sharbidre Vimal Metkari Priyanka Patode 《Pesticide biochemistry and physiology》2011,101(2):132-141
Tests of acute toxicity were performed on the most common species of aquarium fish, Poecilia reticulata. Guppies (P. reticulata) were exposed to progressive concentrations of methyl parathion (MP) and chlorpyrifos (CPF); a semi-static method according to guidelines of OECD was used. Tests of acute toxicity were conducted using 10 fish for each separate concentration and for the control group. The results were subjected to probit analysis to determine the 96 h LC50 values. The 96 h LC50 values of MP and CPF to P. reticulata were 8.48 ppm/L (5.98–10.89) and 0.176 ppm/L (0.313–0.224) respectively. In addition, behavioral changes at each concentration were observed for the individual fish. Fish were exposed for 96 h to different sublethal concentrations of MP and CPF (¼ LC50, 1/8 LC50 and 1/10 LC50) and their oxidative stress-induction potential was estimated in brain, liver and gills of fish. MDA content is induced in all tissues but maximum rise was observed in gills (161% and 153% for MP and CPF respectively). With regard to antioxidant defense system (ADS), GSH level decreased in the brain, liver and gills of tissues of MP treated fishes (22%, 6% and 13% respectively) and showed increase in brain and gills CPF treated (23% and 21% respectively). CAT, GST, GR and SOD levels fluctuated in all treatment groups relative to the control. Brain AChE showed dose-dependent inhibition in fish exposed to the higher concentrations reached 45% and 66% for MP and CPF respectively. Collective findings demonstrated that pesticide exposure of fish induced an increase in MDA and fluctuated ADS along with inhibited AChE. These findings may be used as valuable biomarkers for evaluation of water pollution. 相似文献
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尺寸公差标注是绘制机械图的一项重要内容。为了使机械CAD软件中的尺寸标注符合我国机械制图标准,作者以AutoCADR12为操作平台,在DOS环境下,利用AutoCADR12的高级用户开发系统,即ADS语言及对话框控制语言(DCL),研究并开发了尺寸标注系统。 相似文献
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阐述了一个三维塑料注射模具CAD系统的整体开发方案,并通过对AutoCAD的二次开发,详细说明了注射件尺寸向型芯,型腔尺寸的自动转换,建立注塑模标准零件库以及标准模架组合装配程序的开发方法。 相似文献
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多传感器的高精度湿度测量仪 总被引:1,自引:1,他引:0
介绍了一种湿度测量仪的设计方案,给出了硬件设计的总体框图;详细阐述了3款湿度传感器的信号采集电路;介绍了显示电路、电源模块、通讯接口以及湿度信号采集电路的软件设计。电路设计以高性能的JN5121为核心,简化了外围接口电路的设计,提高了系统的性价比,并利用低功耗、低价格及性能稳定的ZigBee技术构成了无线传感器网络。 相似文献
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