脆性组氨酸三联体基因蛋白表达与炎症性肠病的临床关系

目的:探讨脆性组氨酸三联体基因(fragile histidine trail, FHIT)蛋白在38例溃疡性结肠炎(ulcerative colitis,UC)、25例Crohn’s病、11例UC相关性腺癌和13例正常对照组中的表达情况. 方法:标本常规石蜡包埋,采用免疫组化法检测FHIT在UC、Crohn’s病、UC相关性腺癌和正常对照组中的表达. 结果:38例UC中,25例FHIT蛋白表达阴性;25例Crohn’S 病中,19例表达阴性;11例UC相关性腺癌中,6例表达阴性.FHIT蛋白在UC和正常对照组(71.43%vs 7.69%, X2=18.80,P0.05). 结论:FHIT蛋白在炎症性肠病(inflammatory bowel disease, IBD)和UC相关性腺癌中呈低表达或缺失,提示该基因可能与IBD和UC相关性腺癌发生有关

Effect of HCO_3~-Concentration on CO_2 Corrosion in Gas and Oil Fields

应用动电位扫描和失重法研究HCO3-对油气田CO2腐蚀的影响.实验表明,当HCO3-浓度低于0.042 mol/L时,随着HCO3-浓度的增加,溶液pH升高,H+的还原速率(阴极电流密度)下降;HCO3-浓度增至0.126 mol/L时,溶液中的H2CO3、HCO3-的直接还原占主导地位,故阴极过程随HCO3-浓度的上升而加速,对阳极过程,在HCO3-浓度低于0.042 mol/L下,主要为活化过程,而且其阳极溶解电流(密度)随HCO3-浓度的增加而下降;HCO3-浓度增至0.126 mol/L时,阳极过程出现明显的活化-钝化行为.高温高压腐蚀试验显示,材料的腐蚀速率随介质HCO3-浓度的增加而下降.SEM、EDS、XRD分析表明,在较低的HCO3-浓度下,腐蚀产物膜的主要成分为FeCO3晶体,HCO3-浓度较高时,则腐蚀产物主要为Ca、Mg的化合物,并形成Ca(Fe,Mg)(CO3)2复盐.在高pH值下,Ca2+、Mg2+比Fe2+更容易沉积.The effecs of HCO_3~-concentration on CO_(2) corrosion in gas and oil fields were investigated by carrying out potentiodynamic scans and weight loss tests.Potentiodynamic polarization curves showed that the cathodic current density decreased with cm increase of HCO_3~-concentration when [HCO_3~-] was lower than 0.042(mol/L.)The cathodic reations were promoted by increasing [HCO_3~-] when it reached 0.126 mol/L,(Anodic) behavior was an active process at low er [HCO_3~-] concentration and the anodic current density decreased with the increase of [HCO_3~-] concentration.An evident active-passive behavior exhibited in anodic process at 0.126 mol/L HCO_3~-.Under high pressure and high temperature,the corrosion rate of steel X65 decreased with the increase of HCO_3~-concentration while pH increased.SEM,EDS,XRD results of the corrosion scales indicated that a typical FeCO_(3) crystallite was found at low HCO_3~-concentration but Ca(Fe,Mg)(CO_(3))_(2) at high HCO_3~-concentration.Ca~(2+),Mg~(2+) precipitated prior to Fe~(2+) at high pH value.作者联系地址：北京科技大学腐蚀与防护中心,北京科技大学腐蚀与防护中心,北京科技大学腐蚀与防护中心 北京100083,北京100083,北京100083Author's Address: *,LU Min-xu,WU Yin-shunCorrosion and Protection Center,University of Science and Technology Beijing,Beijing 100083,Chin

催化湿式氧化处理碱渣废水的研究

以催化湿式氧化（CWO）技术对碱渣废水进行治理，考察了各种反应条件对废水处理效果的影响。结果表明，在230℃,6.6MPa ，空速8h^-1的反应条件下，CODCr的去除率78％，硫的去除去率达到99％，BOD5／CODCr超过0.8，并对CWO处理后的尾气进行了分析，表明除空气和CO2以外没有其它有害气体

Automatic dispenser

本实用新型涉及投放器，具体地说是一种自动投放器，包括投放器主体及分别安装在其两侧的开关控制装置和支撑装置，开关控制装置包括舵机、十字杠及舵机开关，支撑装置包括支撑杆、支撑杆固定件及弹杆，舵机安装在投放器主体上，十字杠铰接在投放器主体上，十字杠的一端与舵机开关抵接；支撑杆的一端与安装在投放器主体上的支撑杆固定件铰接、并在铰接处设有扭转弹簧，支撑杆的另一端设有弹杆，十字杠的另一端与支撑杆的另一端之间为柔性连接；待投的投放物位于投放器主体内，由投放器主体及支撑杆支撑，投放物的引信通过弹杆顶紧。本实用新型实现投放自动化，结构简单，操作方便，机动性好，实用性强，安全可靠

2002–2010年中国典型生态系统辐射及光能利用效率数据集

辐射是陆地生态系统能量的主要来源,其利用效率表现为光能利用率,反映了生态系统转化光能、生成有机物质的能力。揭示典型生态系统的辐射及光能利用效率可以为评估区域光能资源及其利用效率提供参考,也为评估区域有机物质固定能力及碳吸收能力提供依据。基于中国陆地生态系统通量观测研究联盟(China FLUX)的长期观测结果及已发表文献的公开数据,构建了2002–2010年中国典型生态系统辐射及光能利用效率数据集,包含51个生态系统126个站点年辐射、光能利用效率及吸收光能利用效率的观测记录。另外,本数据集还包含生态系统代码、年份、经度、纬度、海拔、生态系统类型、年均气温、年总降水量、年均CO2质量浓度、年均叶面积指数、最大叶面积指数等生物气候信息。本数据集可以为评估生态系统生产能力、应对气候变化等方面的研究提供数据支持

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