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.     

中国海洋鱼类单殖吸虫研究XXIV. 斧形虫科一新记录种

本文记述了采自海南三亚杜氏下鱵Hyporhamphus dussumieri鳃上的1种单殖吸虫低鱵斧形虫Axine depauperati Yamaguti, 1968。所获标本与Yamaguti（1968）的原始描述基本一致，但在吸铗形状、端钩数量、生殖腔刺和阴茎刺数量上略有差异。低鱵斧形虫为中国新记录，杜氏下鱵为宿主新记录。     

变频空调电气控制系统设计

介绍了空调系统的基本工作原理,对变频空调与定频空调的工作原理进行了比较,充分体现了变频空调的优越性,从室内外的硬件设计和软件设计介绍了家用一拖一变频空调,室外逆变电路部分由智能功率模块取代了分立的六路IGBT构成的逆变电路,有效地提高了系统的稳定性和可靠性,最后的整机测试波形论证了整个系统的可行性。