东湖茶港排污口底泥对稀有鮈鲫的毒性

以东湖茶港排污口底泥复溶水为试验相,采用96h急性毒性试验和胚胎—卵黄囊吸收阶段毒性试验方法,研究了东湖茶港排污口底泥对稀有的鮈鲫毒性。结果显示,高浓度的复溶水对稀有鮈鲫胚胎、仔鱼和幼鱼具有明显的毒性效应,而胚胎—卵黄囊吸收阶段更为敏感。随着复溶水浓度的增加,稀有鮈鲫受精卵孵化率降低,仔鱼畸形率增高、成活率降低、生长减慢;对胚胎—卵黄囊吸收阶段的NOEC、LOEC和MATC分别为12.5%、25%和17.68%;对幼鱼96h LC50为69.1%。本文的研究还表明,底泥经晾晒后毒性大幅降低,暗示恢复东湖

Cross Time-Period Effect in Intertemporal Choice

跨期选择需要决策者对未来不同时间点的损益之间做出权衡与取舍,涉及对未来时间的长度知觉.本研究认为:在现实生活中,当人们用周期把一段连续的时间分割成不同的部分时(比如把未来的时间划分成本周和下周),他们对未来时间的长度知觉就会发生变化,进而影响跨期选择.实验1控制配对跨期选项的客观间隔时间不变,发现相对于两个奖励选项在同一周期的条件(比如同周),选项分布于不同周期时(比如跨周)被试更愿意选择结果小而早的选项(smaller;sooner,SS)而非结果大而迟的选项(later;larger,LL).实验2的结果则显示,跨时间周期现象是由于周期分割点的存在,引起被试对选项间的时间间隔知觉变长,进而选择SS所致

中国胭脂鱼线粒体控制区遗传多样性分析

利用PCR技术扩增了采自长江宜昌江段和清江的 8尾中国胭脂鱼线粒体DNA控制区全序列。研究发现该种具有脊椎动物线粒体控制区的一般结构 .在获得的 95 8bp的碱基序列中 ,共检测出 32个多态性核苷酸变异位点 ,多态位点比例为 0 .0 33。核苷酸的变异位点除一个为缺失外 ,其余全部为碱基转换 .变异位点主要集中在 5 5～36 5bp高变异区 ,而其他区域突变稀少。个体的变异在 0～ 1.36 %之间 ,表现出较大的个体多态性差异。中国胭脂鱼的线粒体控制区的变异远大于美国胭脂鱼 (Moxostom

Three-arm annular inspection tour robot mechanism

本实用新型涉及移动机器人机构，具体地说是一种三臂环形巡检机器人机构，包括前、下、后轮爪机构，前、下、后摇臂机构和中心轮，前、下、后摇臂机构的一端通过转动机构与中心轮连接，另一端分别与前、下、后摆臂的一端通过前、下、后俯仰机构转动连接，前、下、后摆臂的另一端通过回转机构与前、下、后轮爪机构转动连接，前、下、后轮爪机构的另一端设有在输电线上行走的行走机构及夹紧输电线的夹紧机构；前、下、后俯仰机构结构相同，包括转动副及驱动电机；前、下、后回转机构结构相同，包括转动副及驱动电机。本实用新型具有能够跨越引流线等复杂的障碍物能力，可适应地线、导线等多种线路环境，具有结构简单，越障能力强，应用范围广等优点

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