汽车前照灯检测问题的分析

汽车检测是一种技术服务,它能采用不解体诊断技术,对汽车动力性、安全性、可靠性等进行评价,是检查、鉴定车辆技术状况和维修质量的基本手段。文章针对汽车前照灯检测技术进行了探讨。     

基于自适应Backstepping方法的无人飞艇纵向受限控制

针对无人飞艇受扰纵向运动难以控制的特点,提出了一种基于自适应Backstepping方法的鲁棒受限控制方法.首先对于飞艇模型中的外部时变干扰,采用参数自适应方法进行有效的处理.然后在无人飞艇飞行控制器设计时,明确考虑到非对称输入饱和限制的影响.引入一个辅助分析系统,对无人飞艇输入限制的影响进行有效分析.同时将辅助分析系...     

近红外漫反射光谱法在川续断属植物鉴别中的应用

用近红外漫反射光谱法对川续断和部分川续断属其它植物进行鉴别,为川续断的品种鉴别和质量评价提供一种新的可能的方法和手段.分别对6种川续断属植物的近红外漫反射原始图谱和经过多元散射校正(MSC)和二阶导数(SD)处理后的图谱建立PLSDA模型.快速、准确地鉴别川续断和部分川续断属其它植物,同时不同产地的同种样品也得到了准确的区分.本方法快速.准确,不破坏样品,能用于鉴别川续断和川续断属其它植物.     

Extraction of metals from complex sulfide nickel concentrates by low-temperature chlorination roasting and water leaching

The recovery of valuable metals from complex sulfide concentrates was investigated via chlorination roasting followed by water leaching. A reaction process is proposed on the basis of previous studies and the results of our preliminary experiments. During the process, various process parameters were studied, including the roasting temperature, the addition of NH₄Cl, the roasting time, the leaching time, and the liquid-to-solid ratio. The roasted products and leach residues were characterized by X-ray diffraction and vibrational spectroscopy. Under the optimum condition, 95% of Ni, 98% of Cu, and 88% of Co were recovered. In addition, the removal of iron was studied in the water leaching stage. The results demonstrate that this process provides an effective approach for extracting multiple metals from complex concentrates or ores.     

氧化石墨烯-铁基复合材料的制备及热稳定性能研究

采用改进的hummers法制备氧化石墨,通过超声震荡剥离成单层的氧化石墨烯.以制备的氧化石墨烯作为原料,水热法合成四氧化三铁/氧化石墨烯复合材料.利用SEM,XRD,Raman对此复合材料物相结构及形貌进行表征,并对样品进行热重-差热分析,获得较优的热稳定性能,从而更好地应用于阻燃领域.     

农科类专业实践教学模式探索

实践教学对学生综合素质的提高、创新精神和实践能力的培养具有特殊作用,是提高人才培养质量的有效途径。生产实习是农科类专业实践教学体系中最重要的一环,通过深化对实践教学的认识,修订人才培养方案和制定科学合理的实践教学计划,加大实践教学基地建设力度以及加强生产实习管理,湖北工程学院农学院逐步探索出生产实习与毕业论文、学生就业相结合的实践教学模式。湖北工程学院农学、园艺专业十多年的实践证明,该模式实施效果良好。     

白居易诗中之数字与佛禅思想

唐人在诗中频繁使用数字,成为其时诗文创作的重要表现形式.白居易诗中所出现的数字却常用以记叙现实状况.分析白居易以数字入诗的特点,可以认识白居易的“中人”意识,以及白居易以数字入诗背后所隐含的佛禅思想.     

Typical Construction Program of 600 MV Unit Supercritical Boiler Boiler

文章介绍了国产600 MW机组超临界直流锅炉的施工方案,重点论述了主要施工机械和布置、施工方案简介,前后炉膛的吊装顺序.     

Business Environment and Resource Allocation Based on the Perspective of the National Value Chain

China is actively upgrading its industrial structure through industries transferring between developed and undeveloped areas; however, the overall level of the national value chain is still not high, and the asymmetric competition pattern between the upstream and the downstream has not been broken. Therefore, this paper establishes a competitive equilibrium model for the production of manufacturing enterprises, with factor price distortion, under the condition of constant returns to scale.The au...     

Nano-mechanical and tribological properties of copper matrix composites reinforced by graphene nanosheets

The impacts of graphene nanosheets content on microstructure, nano-mechanical and tribological properties of the copper matrix composites were investigated. The graphene nanosheets randomly distributed in copper matrix, which obviously hindered its grain growth. The elastic modulus and nano-hardness of the copper matrix composite with 0.2 wt% graphene nanosheets were enhanced 47.5% and 54.7% compared to these of pure copper, respectively. The average creep degree(5.1%) was lower than that(11.8%) of pure copper in holding stage. The creep rate(ca. 0.016 nm/s) decreased 10 times as that(ca. 0.16 nm/s) of pure copper in steady-state creep. The tribological performances were improved dramatically with increase of graphene nanosheets content.