从公共服务的非竞争性与非排他性看城市的结构分化与城市价值及对京津冀一体化的借鉴价值

城市功能区的划分以及城市价值的衡量等空间问题难以应用平面化的理论分析,其往往会出现断崖式的波动,表现出其不符合市场规律的一面。而事实上城市的价值就在于提供社会公共服务,所以我们可以尝试从公共服务的角度来分析城市的空间结构与价值。与此同时借助经济学中有关公共服务的非竞争性与非排他性的特点来分析人们对不同公共资源配置的激励与反应。并以此为理论探究对京津冀一体化进程的指导意义

黄土高原泾河小流域泥沙碳、氮同位素与生态环境示踪

以泾河(陕西彬县境内)4条支流表层沉积物为研究对象,对其有机质的稳定碳、氮同位素组成进行测定和研究。结果表明,4条河流表层沉积物有机质的碳同位素(&delta;~(13)C)值变化范围为(-29.1&permil;)~(-20.4&permil;), 平均值为一25.4%其&delta;~(13)C值从上游到下游都有逐渐偏正的趋势,表明从上游到下游植被覆盖类型的变化影响了沿河表层沉积物有机质的&delta;~(13)值。4条河流表层沉积物有机质的氮同位素(&delta;~(13)N)值和碳氮比(C/N)的变化范围分别为0~4.6&permil;和1.4~17.2,平均值分别为2.8%和7.3。从上游到下游其&delta;~(15)N值逐渐偏正,表明沿岸进入河中的泥沙比例越来越大,人类活动等对自然环境的影响增强。徐家河和拜家河下游采样点表层沉积物有机质的&delta;~(15)N值有偏负趋势,可能与下游煤炭开采,煤等有机质进入河流表层沉积物有关。因此, 对河流表层沉积物中有机质的碳、氮同位素组成特征和变化研究可以揭示流域土壤侵蚀状态和生态环境的变化。</p

Nursing of a patient with type 2 diabetes mellitus complicated with invasive pulmonary aspergillosis resulting in the formation of a cavity in the upper lobe of the right lung causing hemoptysis (1例2型糖尿病合并侵袭性肺曲霉菌病致右肺上叶空洞形成致大咯血患者的护理体会)

This paper summarized the nursing of a patient with type 2 diabetes mellitus complicated with invasive pulmonary aspergillosis resulting in the formation of a cavity in the upper lobe of the right lung causing hemoptysis. Nurses had closely observe the changes in the patient's condition and carried out comprehensive interventions including hemoptysis care, dietary care, disinfection and isolation, cough and sputum production and oxygen therapy care, Traditional Chinese Medicine nursing, psychological care and health education. Efforts were made to reduce the risk of hemoptysis, control the blood glucose, improve immunity and quality of life of the patient. (本文总结1例2型糖尿病合并侵袭性肺曲霉菌病导致右肺上叶空洞形成致大咯血患者的护理的经验。患入院后密切观察病情变化, 给予咯血护理、饮食护理、消毒隔离、咳嗽咳痰及氧疗护理、中医护理、心理护理以及健康宣教, 降低患者咯血风险, 积极控制血糖, 增强机体抵抗力, 提高生活质量。

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