亚运会转播国际声采集和传输系统

以广州亚运会为背景,概括地叙述了大型体育赛事转播系统中,国际声信号的采集和制作所遵从的原则及具体方法,并给出了高质量的、可靠的传输方案。     

长途智能网全网帐务计费结算流程设计解析

本文详细分析了中国长途智能网全网帐务计费结算流程设计,并就此方面指明了全面开通长途智能网业务并确保全网顺畅运转的关键所在。     

发射区硼掺杂浓度对横向PNP晶体管高低剂量率辐射损伤的影响

本文研究了发射区重硼掺杂和轻硼掺杂横向PNP晶体管的高低剂量率辐照损伤特性。实验结果表明,随总剂量的增加,晶体管基极电流增大,电流增益下降,且轻掺杂PNP晶体管的退化更为严重。文中讨论了辐照感生缺陷在发射区重掺杂和轻掺杂晶体管退化中的作用,特别是氧化物正电荷的双重作用。最后,文章详细论述了高低剂量率辐照下,重掺杂PNP晶体管集电极电流IC的辐照响应。     

国际造纸化学品公司及其在我国的发展

国际造纸化学品公司是造纸化学品开发和推广的重要力量,它们在我国造纸化学品工业的发展过程中也起了重要的作用,该文简述了国际造纸化学品公司以及它们在我国的发展.     

我国木质林产品国际贸易的特点分析

利用近10年来的我国木质林产品进出口数据,从贸易地位、贸易增长、进出口产品结构、进出口地区结构、贸易条件、贸易方式等方面,分析归纳了近年来我国木质林产品国际贸易的特点和问题。     

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纺织工业经济指标的灰色预测模型分析

利用灰色系统理论，对我国纺织工业主要经济指标做了建模分析。结果表明，对于生产总值和销售收入，用残差周期修正模型精度较高。对利税额精度极低，说明产值与利税不同步增长。     

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Blog作为Web2.0的重要应用以其个性化的信息发布平台、多元化的内容载体等特点吸引网络用户。撰写和浏览Blog已经成为网络文化的流行热点,推动了Blog搜索服务的发展。目前的Blog搜索服务大都是基于对查询关键词的匹配来实现的,缺乏自动提取用户兴趣并进行推荐的能力。该文设计和实现了一个面向Blog的兴趣挖掘和推荐系统Blog-digger,该系统采用兴趣挖掘技术,能自动识别用户的兴趣,并主动推荐主题相关的Blog。实验结果证明了该系统的有效性。     

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镍在不锈钢行业中有着稳定的需求,含镍电池也引发了镍需求的进一步增长.本文基于2010—2019年数据构建全球镍及其制品贸易网络,从贸易价值、网络结构和网络影响力对全球贸易格局进行分析,对贸易价值和经济发展指标进行相关性分析,从贸易伙伴和贸易集中度对中国贸易网络特征进行分析.研究发现:镍及其制品贸易价值受经济发展影响,发...     

Western Canadian dairy farmers' perspectives on the provision of outdoor access for dairy cows and on the perceptions of other stakeholders

The provision of pasture and outdoor access for dairy cattle differs around the globe. For example, in Ireland, New Zealand, and Australia, dairy farms are largely pasture based, whereas dairy farms in the United States and Canada are largely confinement based. There is a high level of public support for pasture and outdoor access for dairy cows, and the available evidence shows that dairy cattle are highly motivated to access pasture, especially at night. The decision as to whether to provide outdoor access is typically made by farmers, but little is known about dairy farmers' perspectives on this topic. We investigated perspectives of Western Canadian dairy farmers on outdoor access, as well as how they believe different stakeholders (i.e., the dairy industry, the dairy cows, and the general public) regard outdoor access for dairy cows. Data were collected via (1) 11 focus group discussions with a total of 50 Western Canadian dairy farmers, and (2) semi-structured individual interviews with an additional 6 dairy farmers of Hutterite colonies. Data were analyzed using template analysis. Although most participants in this study did not provide outdoor access on their farms, or only provided outdoor access to certain cow groups, participants generally mentioned that they enjoyed seeing cows on pasture or outdoors. However, participants shared that the Canadian supply management system (including processors) required a consistent flow of production, which was thought to be easier and more economically realized with indoor housing of lactating cows. Participants believed that pasture or outdoor access for dairy cows was desired by the public. Some participants believed that dairy cows prefer to spend time outside under favorable weather conditions, but others felt that cows preferred to stay indoors in modern, ventilated freestall barns. The results of this study describe the perspectives of dairy farmers regarding the views of dairy industry stakeholders as they relate to outdoor access, helping to inform conversations around the provision of outdoor access for dairy cattle.