Research on the Nonlinear Relation of City Scale and Economic Growth under the Constraint of Urban Household Registration

利用2000年~2010年31个省市城市规模与经济增长的相关数据,构建门槛回归模型,探讨户籍管制下城市规模与经济增长的动态发展过程。研究发现:户籍管制的确构成了城市规模的发展瓶颈,过高的户籍管制导致城市规模与经济增长的负相关,而过低的户籍管制则影响城市规模对经济增长的带动作用;进一步结合样本分布的时空特征,指出户籍约束而非过度城市化导致了现阶段城市规模的低效率集聚。城市规模与经济增长的非线性关系,应该通过户籍改革加快城市化进程,并制定合理的户籍管制政策,防止户籍管制过低或过高对经济增长造成不利影响。Using 31 provinces' relevant data of city scale and economic growth from 2000 to 2010,this paper builds a threshold regression model to investigate the dynamic development process of urban household size and economic growth.It finds that: household control does constitute a bottleneck for the development of city scale,and too-high household control leads to the negative correlation of city size with economic growth,while too-low household control cannot maximize the driving role of city size in economic growth.The further integration of spatial and temporal characteristics of the sample distribution shows that it is the household constraint rather than the excessive urbanization that has led to the low efficiency of urban-scale gathering stage.The nonlinear relation between city size and economic growth should accelerate the process of urbanization through household registration reforms,and reasonable household regulatory policies should be developed to prevent the adverse effect of too-low or too-high household control on economic growth.国家社会科学基金项目(12BJL021

光电子材料InP玷污的研究

文章给出了光电子材料InP的（100）和（111）晶面质谱分析的结果，对（100）晶面做了光荧光分析。在300和77 K温度下测量了（100）晶面的电子浓度及电子迁移率。研究表明玷污主要来自硅

Expert consensus on the management of dermatogenic chronic pruritus in children

瘙痒见于多种疾病,在儿童多由皮肤疾病导致,即皮肤源性瘙痒.持续存在的慢性瘙痒治疗困难,可对患儿的睡眠、情绪、认知、学校表现及社会家庭功能等方面产生负面影响,严重影响患儿及其家庭成员的生活质量.临床上迫切需要对儿童慢性瘙痒进行规范化管理,而目前国内外缺乏独立的儿童慢性瘙痒诊疗指南或共识.该共识根据循证医学证据及专家意见,制定了一套针对0～18岁儿童皮肤源性慢性瘙痒的管理方案,供临床医生参考.</p

Prediction of Energy Resolution in the JUNO Experiment

International audienceThis paper presents the energy resolution study in the JUNO experiment, incorporating the latest knowledge acquired during the detector construction phase. The determination of neutrino mass ordering in JUNO requires an exceptional energy resolution better than 3% at 1 MeV. To achieve this ambitious goal, significant efforts have been undertaken in the design and production of the key components of the JUNO detector. Various factors affecting the detection of inverse beta decay signals have an impact on the energy resolution, extending beyond the statistical fluctuations of the detected number of photons, such as the properties of liquid scintillator, performance of photomultiplier tubes, and the energy reconstruction algorithm. To account for these effects, a full JUNO simulation and reconstruction approach is employed. This enables the modeling of all relevant effects and the evaluation of associated inputs to accurately estimate the energy resolution. The study reveals an energy resolution of 2.95% at 1 MeV. Furthermore, the study assesses the contribution of major effects to the overall energy resolution budget. This analysis serves as a reference for interpreting future measurements of energy resolution during JUNO data taking. Moreover, it provides a guideline in comprehending the energy resolution characteristics of liquid scintillator-based detectors

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