异育银鲫幼鱼对饲料中缬氨酸需求量的研究

通过65d的生长实验,探讨饲料中不同缬氨酸水平对异育银鲫（Carassius auratus gibelio）幼鱼平均体重（3.17±0.01）g/尾生长性能、饲料利用和蛋白利用的影响,确定异育银鲫对饲料中缬氨酸的需要量。实验设计由酪蛋白、明胶和晶体氨基酸为蛋白源的8种等氮（蛋白含量：38%）等能（总能：17.0 kJ/g）的半精制饲料,其缬氨酸水平等梯度逐步升高（0.54、0.79、1.04、1.29、1.54、1.79、2.04、2.29%饲料干物质）。各实验饲料中缬氨酸的实测值分别为：0.66、0.85、1.07、1.22、1.46、1.70、1.86和2.12%饲料干物质。饲料中其他必需氨基酸含量参照异育银鲫肌肉氨基酸模式。每种饲料饲喂3个重复,每个重复30尾鱼,养殖于塑料方箱中（70 cm×55 cm×50 cm;水体容积：150 L）,养殖系统为室内流水系统（500 mL/min流速）,每天两次饱食连续投喂（9：00和16：00）。实验结果表明,饲料中适量的缬氨酸显著提高了异育银鲫的特定生长率、饲料转化效率和蛋白沉积率（P〈0.05）,特定生长率、饲料转化效率和蛋白沉积率均是1.70%处理组最高。饲料缬氨酸水平对异育银鲫血糖浓度及肝脏中的谷草转氨酶（AST）、谷丙转氨酶（ALT）的活性均无显著影响（P〉0.05）,但显著影响了血清谷氨酰胺的浓度（P〈0.05）。各处理组的鱼体粗蛋白、粗脂肪、水分均无显著差异（P〉0.05）,但不同的缬氨酸水平显著影响了鱼体灰分含量（P〈0.05）。对各处理组异育银鲫特定生长率的结果进行二次回归分析,结果表明满足异育银鲫最大生长的缬氨酸需求量为饲料干物质的1.72%,即占饲料蛋白的4.53%

The Foreign Language Collection Development of Social Sciences & Humanities Since 1949 and Its Future Sustanablity in Academic Libraries

以高校人文社科外文文献为重点,概述建国以来我国高校的文献收藏情况、对人文社会科学研究的支撑程度和满足水平、以及面对问题采取的保障与宏观建设方案。Focusing on the foreign language collections of social sciences and humanities in academic libraries,the paper summarizes its development,support and guarantees level for academic research,and discusses the macro-construction plan in the future.教育部人文社会科学研究规划基金项目“高校人文社科外文文献资源的布局与保障研究”(项目编号:08JA870002)课题的结题论

黄土高原综合治理试验示范区航空遥感监测试验研究

本课题属“七·五”科技攻关项目《黄土高原综合治理》（75-04-03-15）研究内容之一。1、成功地进行了水土流失综合治理大范围（跨越了两个生物气候带，分布于5省区中的11个试验示范区）大比例尺彩红外航空遥感监测，提出了有关参数的选定原则。2、综合应用了目视判读、光学处理、机助分类与制图等遥感信息提取技术，初步形成了一套独具特色、且适用于地形复杂地区的遥感图象处理方法。3、首次设计和建立了以大比例尺信息源为基础、并直接为小流域综合治理服务的信息系统，共建立了76个原始数据库，采集了55bit属性数据，150兆图形和图象数据，编写了232个专业程序，170个说明、解释、提示文件。4、以遥感影像分析和综合治理信息系统为基础，建立了水土流失综合治理评级系统，首次设计和编制了《综合治理评价图》，即能定位、定量、形象地显示了小流域综合治理现状、又能表明进一步治理方向的重点和方向

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies