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In order to recover ore as much as possible, a computer-controlled truck real-time dis-patching model is conducted under the conditions of Qidashan Iron Mine. It can not only acquirethe optimization of shovel and truck operation, but also satisfy requirements of blending ores.The simulation results indicate the effectiveness of the model developed. 相似文献
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确定设计煤质工作中的问题探讨四川省电力工业局王忠强四川电力勘察设计院骆振宇火电建设的前期阶段,确定设计煤质是一项重要的基础性工作。它十分重要而技术性又很强,涉及的专业多而影响面又很广。目前,国家尚未对此制订统一的技术标准,也缺乏有关的指导性文件,因而... 相似文献
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CIS育苗营养基对西红柿品质影响的实验研究 总被引:1,自引:0,他引:1
加强无公害农业关键技术和无公害农业专用生产资料(农药、肥料、种苗基质、饲料、饵料等)的研制开发,依靠科学技术控制有害化学品的滥用,是提高谷物、果蔬、畜禽及水产品品质的重要手段。现代化种苗产业是构筑蔬菜和经济作物生产现代化的基础,也是无公害食品、绿色食品和有机食品生产的第一环节。我们采用低位草本泥炭为原料,开发研制成功CIS育苗营养基,不仅实现了提高种苗产业技术水平的目标,在增加蔬菜产量、提高农产品品质等方面也取得了显著效果。试验结果表明,CIS营养基育苗与营养土育苗、穴盘育苗、泥炭块育苗相比,可提高西红柿产量14.13%~43.08%,提高西红柿果实中Vc含量36.13%~61.73%,提高可溶糖15%~20%,提高糖酸比5.8%~32.54%,降低硝酸盐含量4.6%~24.64%。CIS育苗营养基为提高种苗生产技术水平,增加蔬菜产量,改善蔬菜品质,促进无公害食品和绿色食品生产提供了新型资材。 相似文献
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通过差示扫描量热仪(DSC)研究了熔融聚合耐高温聚酰胺10T以及10T/11树脂的等温结晶行为。通过Avrami方程分析了PA10T和PA10T/11的等温结晶动力学,其Avrami指数n值介于1.79~2.31之间,表明了PA10T和PA10T/11晶体以一维针状生长和二维片状生长并存,然后计算了相关的结晶动力学参数。通过Arrhenius方程计算了PA10T和PA10T/11的等温结晶活化能,同时通过Hoffman-Weeks外推法得到了PA10T和PA10T/11的平衡熔点。并且,利用Turnbull-Fisher方程和Lauritzen-Hoffman方程研究了PA10T和PA10T/11的结晶生长方式。偏光显微镜和X射线衍射分析表明,在实验条件下PA10T和PA10T/11以一维针状生长和二维片状生长并存,并且加入11-氨基十一酸后PA10T/11的晶粒尺寸显著细化。 相似文献
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Nylon 10T and nylon 10T/1010 samples were synthesized by direct melt polymerization.The isothermal crystallization kinetics of nylon 10T and nylon 10T/1010 was investigated by means of differential scanning calorimetry(DSC).The crystallization kinetics under isothermal condition has been analyzed by the Avrami equation.It was found that the Avrami equation was well-suited to describe the isothermal crystallization kinetics,combined with the results of the Turnbull-Fisher equation.The values of T_m~0 and K_g were obtained by Hoffman-Weeks and Lauritzen-Hoffman equations,respectively.The activation energies for isothermal crystallization of nylon 10T and nylon 10T/1010 were determined using the Arrhenius equation and found to be-123.24 and-81.86 kJ·mol~(-1),respectively,which reveals that the crystallization ability of nylon 10T/1010was lower than that of nylon 10T during the isothermal crystallization process.The crystal morphology was observed by means of polarized optical microscopy(POM)and X-ray diffraction(XRD).It was found that the addition of sebacic acid comonomer did not change the crystal form of nylon 10T,but significantly increased the number and decreased the size of spherulites. 相似文献
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通过熔融挤出的方法分别用环氧类扩链剂和双恶唑啉类扩链剂对尼龙(PA)6进行扩链增黏,并对扩链产物的特性黏度,力学性能和加工性能等进行了测试,对比了两类扩链剂对PA6的改性效果。结果表明,当这两类扩链剂的质量分数均为0.9%时,PA6的各项性能最佳;双恶唑啉类扩链剂对PA6的改性效果比环氧类扩链剂要好。相对于纯PA6,添加质量分数为0.9%的双恶唑啉类扩链剂,可使扩链PA6的特性黏度由0.86 d L/g增加到1.57 d L/g,熔体流动速率由14.3 g/10 min降到5 g/10 min,缺口冲击强度由5.5 k J/m2增加到7.3 k J/m2,拉伸强度由54 MPa增加到65.85 MPa,断裂伸长率由130%增加到450.9%,弯曲强度由53.16 MPa增加到72.66 MPa,平衡扭矩由2.1 N·m升高到5.3 N·m。 相似文献
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