蓝莓提取物对改善小鼠睡眠剥夺型记忆力减退的影响研究     

杨闯  潘顺圆  刘鑫悦  李震东  杨帆  裴娜  孙磊  任永宁  孔凡志 《黑龙江八一农垦大学学报》2020,32(6):38-42

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海南省益智产业发展优势、存在问题与对策     

晏小霞  王茂媛  王清隆  任保兰  羊青  汤欢  王祝年 《农学学报》2020,10(7):97-100

为促进海南省益智(Alpinia oxyphylla Miq.)产业的可持续发展,更好地发挥其对地区经济的推动作用,对海南益智产业发展现状开展了调查。分析发现海南益智产业具有资源比较优势明显、市场潜力巨大、产业基础良好等发展潜力和优势,是海南经济结构调整和精准扶贫的首选。指出了海南益智产业发展中存在种苗、种植、品质、市场风险等问题,提出了加强育种、规范化栽培、功能成分提取和产品开发研究,制定相关标准,健全组织保障和资金保障体系,加强市场营销,打响品牌知名度等建议。此研究可为海南益智产业发展提供参考。  相似文献   

Optimum Level of Dietary n‐3 Highly Unsaturated Fatty Acids for Juvenile Sea Cucumber,Apostichopus japonicus          下载免费PDF全文

Mingling Liao  Tongjun Ren  Wei Chen  Zhiqiang Jiang  Huan Yang  Yuzhe Han 《Journal of the World Aquaculture Society》2015,46(6):642-649

A feeding trial was conducted to estimate the optimum level of dietary n‐3 highly unsaturated fatty acids (HUFAs) for juvenile sea cucumber, Apostichopus japonicas, based on growth performance and fatty acid compositions. Diets with five n‐3 HUFAs levels (0.15, 0.22, 0.33, 0.38, and 0.46%) were fed to sea cucumber juveniles (1.97 ± 0.01 g) once a day for 60 d. The sea cucumbers fed diets containing 0.22% n‐3 HUFAs showed significantly (P < 0.05) higher body weight gain, feed efficiency, and protein efficiency ratio than the sea cucumbers fed diets containing 0.15% n‐3 HUFAs, but not significantly different (P > 0.05) from those of sea cucumbers fed diets containing 0.33, 0.38, and 0.46% n‐3 HUFAs. The sea cucumbers fed diets containing 0.46% n‐3 HUFAs showed significantly (P < 0.05) higher eicosapentaenoic acid and saturated fatty acid than the sea cucumber fed diets containing 0.15% n‐3 HUFAs, but not significantly different (P > 0.05) from those of sea cucumbers fed diets containing 0.22, 0.33, and 0.38% n‐3 HUFAs. The results of growth performance and n‐3 HUFA compositions of body wall indicated that the optimum level of dietary n‐3 HUFAs for juvenile sea cucumber is between 0.22 and 0.46%.  相似文献   

多自由度剑麻收割机的设计与仿真制造     

任晓智  孟强  毕伟  叶自旺  陈云凡 《农机化研究》2017,(9)

剑麻是一种广泛使用的硬质纤维的主要来源,被广泛的运用到各种行业,需求极大;但其收割现以手工为主,且因剑麻自身带有刺,加大了收割的难度,降低了效率。为解决剑麻的纯手工收割收割困难以及效率低的问题,提出一种多自由度剑麻收割机的机械,并申请了国家发明专利,得到授权。本文将运用UG、Sdams以及Mat Leb对该机械进行改进设计与仿真分析,并试制实物机械进行试验。试验结果表明:该机实现了剑麻收割的半自动化并提高剑麻收割的效率,可满足现行各行各业对剑麻的需求量。  相似文献   

中美城市树木碳储存的现状对比研究   总被引：3，自引：0，他引：3  

任继勤  郑惠潆 《森林工程》2016,(4):28-30

本文采用对比研究的方法,对中美城市树木的碳储存和碳封存状况进行比较,结果显示我国的主要城市树木平均碳储量高于美国,单位面积碳储量平均值低于美国,揭示了研究城市树木的碳储存和碳封存具有重要的现实意义,为我国进一步提升城市的生态环境以及城市树木的种植提供了有益思路。本文建议:在进行城市树木补植补造的同时,重视树木种类的选择和气候条件;加大城市绿化的投入力度,加强植被复层结构的管理;加强体制和机制的建设,关注城市树木的种植和养护。  相似文献   

农业科研机构知识库建设需求与策略研究     

戴红君  任妮  虞德容  陆学文 《农业科技管理》2016,(4):39-42

机构知识库作为开放获取的途径之一,在国内外正迅速建设发展。文章基于某农业科研机构科研和管理人员对机构知识库的总体认知、建设需求与参与意愿调研,从资源建设、技术保障、服务拓展和共建共享等方面提出适合农业科研机构的机构知识库建设策略与建议,以期为农业科研机构知识库的规划建设和推广使用提供参考依据。  相似文献   

基于RS与GIS的山东某煤矿区历史遗留损毁土地调查     

丁克松  杜一博  侯晓波  孙利国  任强坤 《农业工程》2016,6(2):75-78

我国地域辽阔，但可利用土地资源少，同时由于生产建设和自然灾害等，造成许多优质土地资源损毁。调查清楚土地损毁情况，采取针对性的土地复垦措施，在目前经济发展中显得尤为迫切。以山东某矿区为例，确定了历史遗留损毁土地的划定依据，利用RS与GIS等技术手段对矿区进行地表沉陷预计，用遥感影像提取土地利用变化情况，得到了历史遗留损毁土地的位置、面积和损毁类型等信息，为后期土地复垦与规划提供参考。   相似文献   

Characterizing long-term forest disturbance history and its drivers in the Ning-Zhen Mountains,Jiangsu Province of eastern China using yearly Landsat observations (1987–2011)     

Mingshi Li  Chengquan Huang  Wenjuan Shen  Xinyu Ren  Yingying Lv  Jingrui Wang  Zhiliang Zhu 《林业研究》2016,27(6):1329-1341

Forest losses or gains have long been recognized as critical processes modulating the carbon flux between the biosphere and the atmosphere. Timely, accurate and spatially explicit information on forest disturbance and recovery history is required for assessing the effectiveness of existing forest management. The major objectives of our research focused on testing the mapping efficacy of the vegetation change tracker (VCT) model over a forested area in China. We used a new version of VCT algorithm built upon the Landsat time series stacks (LTSS). The LTSS consisted of yearly image acquisitions to map forest disturbance history from 1987 to 2011 over the Ning-Zhen Mountains, Jiangsu Province of east China. The LTSS consisted of TM and ETM+ scenes with different projections due to distinct data sources (Beijing remote sensing ground station and the USGS EROS Center). The validation results of the disturbance year maps showed that most spatial agreement measures ranged from 70 to 86 %, comparable with the VCT accuracies reported for many places in USA. Very low accuracies were identified in 1995 (38.3 %) and 1992 (56.2 %) in the current analysis. These resulted from the insensitivity of the VCT algorithm to detect low intensity disturbances and also from the mis-registration errors of the image pairs. Major forest disturbance types existing in our study area were identified as agricultural expansion (39.8 %), urbanization (24.9 %), forest management practice (19.3 %), and mining (12.8 %). In general, there was a gradual decreasing trend in forest cover throughout this region, caused principally by China’s economic, demographic, environmental and political policies and decisions, as well as some weather events. While VCT has largely been used to assess long term changes and trends in the USA, it has great potential for assessing landscape level change elsewhere throughout the world.  相似文献   

辉夜姬——日本竹文化的象征   总被引：1，自引：0，他引：1  

任敬军 《竹子研究汇刊》2010,29(2):59-62

《竹取物语》是日本物语文学之＂鼻祖＂,有着浓厚的日本竹文化背景。通过小说中竹文化背景、竹子发光、竹灵信仰、竹工艺文化、三月长大、辉夜姬的光辉、命名竹文化、管弦竹文化、八月十五升月日等方面,揭示日本竹文化内涵,论证了此竹之传奇的主人公辉夜姬业已成为日本竹文化的象征。  相似文献   

射频识别技术在畜禽养殖中的应用与展望     

廖超  程金花  任守文  李碧侠  付言峰  王学敏  徐小波 《猪业科学》2021,38(11):92-95

随着畜禽规模养殖的发展,高度集约化养殖模式将影响畜禽的健康状况、疫病防控和福利水平。一种无接触、无应激的射频识别（Radio Frequency Identifi cation,RFID）技术应运而生,该技术可以在无损状态下采集畜禽的行为、生理生化和养殖环境指标,从而为评估集约化养殖的效果和影响提供基础数据。文章讨论了三种常见类型的RFID系统在畜禽养殖中的应用,系统地比较了各类系统的优缺点及适宜应用场景,进一步提出RFID在畜禽养殖中的未来应用方向,以期为深化畜禽信息采集的研究提供参考。  相似文献