Spatial heterogeneity of soil saturated hydraulic conductivity on a slope of the

在黄土高原水蚀风蚀交错区坡面(40 m&times;350 m)尺度上进行网格(10 m&times;10 m)取样,用经典统计学和地统计学相结合研究了180个土壤剖面(0&mdash;200 cm)各土层扰动土饱和导水率(Ks)的空间异质性及分布格局。结果表明:0&mdash;20 cm土层的Ks值(5.36&times;10-3cm/s)最大,&gt;20&mdash;200 cm各土层的Ks值均小于表层,其值介于4.32&times;10-3&mdash;4.76&times;10-3cm/s之间。各土层Ks的变异程度相近,均属于中等变异。&gt;20&mdash;200 cm各土层Ks的Kriging插值图分布格局也表现出一致性,因此可用&gt;20&mdash;40 cm土层的Ks值来代表深层Ks值对土壤水分运动进行模拟。除了0&mdash;20 cm的Ks的基台值(C+C0)为0.154,其它各土层基台值介于0.202&mdash;0.276之间,说明0&mdash;20 cm的Ks空间异质性小于&gt;20&mdash;200 cm各土层。从比值C/(C+C0)来看,0&mdash;20 cm属于中等自相关,&gt;20&mdash;200 cm土层属于强的空间自相关性,同样也验证了黄土高原水蚀风蚀交错区土壤剖面饱和导水率具有空间变异特征。 更多还原 </p

新疆罗布泊钾盐矿区地下水勘察研究

该项目实施的目的是为罗布泊钾盐矿区寻找地下水源，并在罗东的阿其克谷地取得了罗布泊地区找水历史上的重大突破，找到了可直接引用的淡水和选矿用水，为钾盐开发奠定了基础，随着罗布泊钾盐科技开发有限责任公司的成立和钾盐资源的勘探，阿其克谷地已作为钾盐矿区首选供水水源地正在进行勘探。2001年7月4日新疆日报公告：“新疆罗布泊钾盐矿区地下水勘察研究”项目的科研成果获自治区科技进步三等奖

甲烷空气催化部分氧化制合成气与含氮合成气制二甲醚的研究

采用常规浸渍法制备了经镧和镁改性的镍基催化剂，以铜锌铝甲醇合成催化剂和HZSM－5分子筛通过机械混合制造了二甲醚合成催化剂，采用固定床流动反应色谱装置研究了甲烷空气催化部分氧化制合成气的催化性能，同时开展了以含氮合成气制备二甲醚的研究，结果说明，镍基催化剂对甲烷空气部分氧化制合成气在常压下具有高的转化率，随压力升高，随压力升高，转化率明显下降，并且催伦剂严重积炭，通过向反应体系添加H2O和CO2可以提高加压条件下的CH4转化率并抑制催化剂积炭，还可获得n(H2)/n(CO)接近2的合成气，满足合成二甲醚的要求，采用含氮合成气制备二甲醚，在压力7．0MPa，空速1000h^-1条件下，催化剂连续使用200h性能基本稳定，CO转化率在93％左右，DME选择性在77％左右，DME收率在72％左右

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