毛细管网吊顶辐射空调与新风耦合的性能研究   总被引：1，自引：0，他引：1  

于志浩  金梧凤  刘艳超 《绿色科技》2013,(11):253-258

对毛细管网结构研发及供冷性能进行测试,并应用 Fluent数值模拟,对毛细管辐射供冷末端与置换通风和贴附射流两种通风方式加以耦合,通过实验验证了其模拟模型对该实验系统具有相关适用性,并应用了该相关模型。结果表明：两种不同的送风方式下,房间的三度均能满足舒适性要求,当热湿负荷突然增加时,如不采取相应的响应动作,毛细管辐射板表面将会有结露现象发生,置换通风较为严重,相同的新风条件下,贴附射流的通风方式,对于消除辐射板结露效果明显。  相似文献   

绿色设计方法论在材料科学中的应用探讨     

靳瑜  张金华  卢良清 《绿色科技》2013,(6):287-289

指出了我国材料科学应用中存在的巨大问题,阐述了转换产业发展思路的重要性和紧迫性,以材料发展中的一些典型案例为切入点并由此延伸开来,深入阐述了绿色设计在材料应用中的巨大意义,提出了绿色设计是材料科学发展的必然选择。  相似文献   

A Spontaneous Epithelial-Myoepithelial Carcinoma of the Submandibular Gland in a Sprague-Dawley Rat     

Yinghua Li  Hak-Soo Kim  Min-Soo Kang  Seo-Ho Shin  Kyo-Hwan Koo  Chul-Min Kim  Kap-Ho Kim  Charles Peck  Han-Ik Bae  Ji Yun Jeong  Jin Seok Kang  Boo-Hyon Kang 《Journal of toxicologic pathology》2013,26(1):67-72

The present report describes a rare case of spontaneous tumor of the salivary gland in a male Sprague-Dawley rat. The clinically confirmed mass rapidly developed in the cervical region between 19 and 21 weeks of age, and the animal was subsequently euthanized. At necropsy, a well-circumscribed nodule approximately 7 × 6 cm in diameter was found at the site of the salivary gland. The cut surface of the nodule was lobulated and soft and had a pinkish tan fish-flesh appearance. One large cyst (approximately 3 × 2 cm in size) containing reddish fluid was also present in the nodule. Histopathologically, the tumor, with a partially lobulated structure, was surrounded by a thin fibrous capsule. The majority of tumor cells formed a diffuse solid sheet structure that mainly consisted of small ovoid or spindle-shaped cells. In the tumor periphery, some cells were arranged in nest-like structures. Small duct-like structures lined with a monolayer of cuboidal epithelial cells resembling an intercalated duct or large polygonal clear cells with a myoepithelial component were also observed. Mitotic figures and necrotic foci were frequently observed in solid areas. Immunohistochemically, the tumor cells were positive for cytokeratin, epithelial membrane antigen, vimentin, p63, α-smooth muscle actin and calponin. The cells were negative for calcitonin, synaptophysin and chromogranin A. On the basis of these findings, the tumor was diagnosed as an epithelial-myoepithelial carcinoma originating from the luminal epithelial cells and myoepithelial cells in the submandibular gland.  相似文献   

The 2009 pandemic (H1N1) viruses isolated from pigs show enhanced pathogenicity in mice     

Yongtao Li  Wei Zou  Guangmin Jia  Jianjiang Ke  Jiping Zhu  Xian Lin  Hongbo Zhou  Meilin Jin 《Veterinary research》2013,44(1):41

Since the emergence of the 2009 pandemic (H1N1) virus (2009/H1N1) in April 2009, cases of transmission from humans to pigs have been reported frequently. In our previous studies, four 2009/H1N1 variants were isolated from pigs. To better understand the phenotypic differences of the pig isolates compared with the human isolate, in this study mice were inoculated intranasally with different 2009/H1N1 viruses, and monitored for morbidity, mortality, and viral replication, cytokine production and pathological changes in the lungs. The results show that all isolates show effective replication in lungs, but varying in their ability to cause morbidity. In particular, the strains of A/swine/Nanchang/3/2010 (H1N1) and A/swine/Nanchang/F9/2010 (H1N1) show the greatest virulence with a persisting replication in lungs and high lethality for mice, compared with the human isolate A/Liaoning /14/2009 (H1N1), which shows low virulence in mice. Furthermore, the lethal strains could induce more severe lung pathological changes and higher production of cytokines than that of other strains at an early stage. Amino acid sequence analysis illustrates prominent differences in viral surface glycoproteins and polymerase subunits between pig isolates and human strains that might correlate with their phenotypic differences. These studies demonstrate that the 2009/H1N1 pig isolates exhibit heterogeneous infectivity and pathogencity in mice, and some strains possess an enhanced pathogenicity compared with the human isolate.  相似文献   

甜荞子粒总黄酮提取工艺的优化     

潘建刚  马利兵  刘忠艳  赵秀娟  贾晋 《湖北农业科学》2013,52(2)

为了充分利用荞麦(Fagopyrum esculentum)资源,以内蒙古甜荞子粒为研究对象,利用乙醇提取法提取子粒中总黄酮,并对其工艺进行优化.最终得出荞麦子粒总黄酮提取的最佳工艺条件为乙醇体积分数65％,水浴时间80 min,水浴温度60℃,料液比1:20(m/V,g:mL).  相似文献   

高海拔地区百合栽培的花期调控技术初探     

王金 《安徽农业科学》2013,(18):7763-7764,7783

该文介绍了百合的生物学特征、对光照、温度及其他环境条件的要求以及这些因素对百合开花的影响,提出在高海拔地区对百合开花期的主要调控技术,为百合的进一步开发利用提供依据。  相似文献   

新疆野苹果种群受损现状     

褚佳瑶  冯琳骄  侯毅兴  陆彪  王强  周龙  王瑾 《经济林研究》2022,40(1):265-273

[目的]为新疆野苹果种群的资源保护和开发利用提供参考.[方法]以新疆野果林不同自然分布区的野苹果为调查对象,在不同海拔、不同坡向、不同坡度设置20个样方,进行野苹果种群受损情况的实地调查.[结果]样地中未受损野苹果树为376棵,占总数的34.03％,其中有357棵为野苹果树苗,占未受损野苹果总数的94.68％.受损新疆...  相似文献   

论我国新型农村金融机构创新与发展     

李艳芳  陶劲 《北京农业职业学院学报》2019,33(3):33-39

在对长三角地区、京津冀地区及安徽、江西等省份大量调研的基础上,全面归纳总结新型农村金融机构的发展状况,重点分析各地新型农村金融机构在负债业务、资产业务和服务等各方面的创新,进而提出:新型农村金融机构应该走"错位"发展、创新发展和合作发展之路,政府应该在法律法规建设、征信体系建设和保障体系建设方面提供政策支持。  相似文献   

大田移动式精量配肥灌溉施肥一体机设计与试验     

刘林  李扬  杨坤  苑进  郝明 《农业机械学报》2019,50(10):124-133

为提高大田施肥精度和水肥利用效率,进一步促进灌溉施肥技术在大田中的应用,设计了大田移动式精量配肥灌溉施肥一体机并进行样机试验。首先,对一体机的移动式行走架、精量配肥装置和首部枢纽装置进行机械设计。其次,基于作物不同生长期所需水肥量,结合实时测定土壤墒情信息,设计3段式全自动灌溉施肥时间分配模型和母液浓度动态计算方法;建立母液浓度动态调控数学模型,针对不同类型颗粒肥溶解时间差异问题,设计一种含Smith预估器的PID切换控制方法快速稳定母液浓度,并通过Simulink对控制方法进行仿真验证;在此基础上,设计并实现一体机的中央控制系统,集成灌溉施肥时间分配模型和母液浓度动态调控方法,实现全自动灌溉施肥功能和母液浓度精准调控;最后,在大田环境中对试制样机开展灌溉施肥试验,测定注肥口电导率(EC)响应曲线并进行分析,结果表明:EC响应曲线呈3段式变化,表明一体机能够按设计的时间分配模型对大田作物进行全自动作业;施肥阶段EC值平稳,误差波动幅度小,过渡时间短、坡度陡、超调量小,表明针对不同类型的颗粒肥,提出的切换控制方法可以快速稳定母液浓度。  相似文献   

融合黄瓜光质需求的设施光环境智能调控模型     

胡瑾  荆昊男  高攀  李远方  张仲雄  张海辉 《农业机械学报》2019,50(9):329-336

设施光环境是影响作物生长发育的重要因素之一,其包括设施光强和光质。不同温度下,两者与光合速率存在显著的互作关系,建立融合作物光质需求的设施光环境智能调控模型,是设施农业环境调控急需解决的问题之一。本文以黄瓜为试验材料,设计了温度、光照强度、光质比嵌套的植株净光合速率测试试验,获取了多因子耦合的试验样本,并利用支持向量机建立了融合黄瓜光质需求的光合速率预测模型。其次,提出了基于粒子群算法的光照强度和光质比寻优算法,获取了不同温度条件下最适合植物生长的光照强度和光质比。最后,基于寻优结果,利用偏最小二乘回归法构建红蓝光目标值调控模型。验证结果表明,光合速率预测模型训练集数据和测试集数据的拟合度分别为0. 997 1和0. 996 9,均方根误差分别为0. 363 0、0. 436 7μmol/(m~2·s)。红、蓝光目标值调控模型均方根误差分别为15. 087 8、10. 138 3μmol/(m~2·s),可满足调控模型精度要求。其调控效果相比于传统固定光质比调控模型有明显提升,为有效地进行设施光环境调控提供了重要依据。  相似文献