Application of real option method in BOT investment decision of Haicang water treatment project

随着城镇化水平的提高和人民生活水平的提高，我国需要投资数万亿人民币，改善城市的供水系统和水质。为了解决资金来源的问题，水务项目投资开始不断拓宽资金渠道。BOT项目投资模式以其独有的优势，吸引了外商资本、本国民间私人资本以及国外先进技术设备与管理经验，减轻了政府财政及债务负担，转移和降低多种风险，因而得以在水务项目投资领域中广泛应用。由于基础设施的先行，城区特别是工业园区的建设充满着变数，传统的净现值投资决策方式在未来现金流量不确定性的情况下局限性明显，引入实物期权决策方式恰恰可以克服这一缺点。本文以海沧水厂项目为例，比较了现金流量法及期权法的分析结果，并利用实物期权方法对海沧水厂投资决策进行了...With the improvement of the level of urbanization and the improvement of people's living standard, China needs to invest trillions of RMB to improve water supply system and water quality of the city. Therefore in order to solve the funding problem, water project began to expand investment continuously to improve water supply system and water quality. BOT investment mode with its unique advantages,...学位：工程硕士院系专业：管理学院_项目管理学号：X200515301

Allelopathy of Invasive Plant Lantana camara on four Receiver Plants

通信作者:[email protected][中文文摘]马缨丹(Lantana camara)是马鞭草科中一种入侵性极强的外来植物,为了明确马缨丹对入侵地农作物的化感作用,研究了不同浓度马缨丹叶片及根系水浸液对绿豆(Vigna radiata)、油菜(Brassica campestris)、小麦(Triticum aestivum)和水稻(Oryza sativa)种子萌发和幼苗生长的影响.结果表明,马缨丹不同部位及不同浓度水浸液对4种农作物化感效应不同,马缨丹水浸液对4种农作物的种子萌发及幼苗生长具有低质量浓度(2mg/mL)轻微促进、中高质量浓度(20,50,100和200mg/mL)较强烈的抑制作用,且随着水浸液浓度的升高其抑制效应不断增强.不同作物对马缨丹化感作用的敏感程度不同,其中油菜对马缨丹的化感作用反应最为敏感,水稻最不敏感.本研究为提高农作物在受马缨丹入侵田地的生长竞争力提供实验依据.[英文文摘]Lantana camara,Verbenaceae family,is one of the invasive alien plants.Previous study about the allelopathy of L.camara mainly focused on exudates from stem and leaf,however,few study analysed the allelopathy of root exudates.At present,with the increasing of L.camarainvasion expands scales,the plant has been expanded into farmland gradually.The aims of this study is to determine the allelopathy of different concentrations of water extracts fromL．camaraleaf and root on the germination and seedling growth of Vigna radiata,Brassica campestris,Triticum aestivum and Oryza sativa.Different parts and concentrations of water extracts from L.camara had different allelopathic effects on four receiver plants．Except the lowest concentration(2mg/mL)had slight facilitation effects,other higher concentrations(20,50,100，200mg/mL)showed significant inhibition effects and the inhibition increased with concentrations.The sensitivity of water extracts fromL.camara was different among four tested species,B.campestris was sensitive to allelopathy of L.camara,while O.sativa was not.This study gave theoretical support for improving the competitiveness of crops aroud L.camara,and also provide a scientific foundation for control of current invasions and prevention of future invasions.厦门市科技计划项目(3502z20092015

天山北坡降雪对葡萄越冬不同覆膜效果的影响[J]

为了省工、省力,又能应对-37℃的极端最低气温和长期低温,对降雪晚而少的干冷年份和早而多的湿冷年份,进行了白塑料和黑塑料薄膜双层和单层覆盖的比较。结果表明:采用双层覆盖比单层优越。在积雪深度不足9cm,最低气温-22℃时,双层覆盖下的最低温度是-9.9℃,而单层覆盖则是-16.0℃,出现了减产,果穗变得小而轻、新枝条短等生产性能不良的影响。在塑膜覆盖中,采用白塑料薄膜较黑塑料薄膜优越。在干冷年份,黑塑膜上不容易保留雪被,单层覆盖-16℃时,而白塑膜因为有雪被覆盖,则是-13.2℃,而且白塑料薄膜价格比黑塑料薄膜便宜近一半

新疆肖塘地区胡杨的种群结构与动态[J]

采用样线法在新疆塔里木河中游的肖塘地区设置4块100 m×100 m的样地,对样地内的胡杨种群进行每木调查并获得野外资料.采用空间代替时间的方法对胡杨的种群结构进行分析.结果表明:胡杨种群的径级结构分布整体上呈现两头低中间高的特点;随着样地与河道的距离变大,样地的胡杨密度整体上呈下降趋势,大龄级个体所占比例呈增加趋势,Ⅲ龄级以下个体所占比例减小;随着龄级的增加,种群致死率出现的2个高峰在Ⅳ～Ⅴ龄级间和Ⅷ龄级以上.此外,对种群动态指数与时间序列的分析表明:Ⅰ、Ⅱ龄级的动态值为负,由于没有低龄个体的更新,随着时间的推移,大龄个体的死亡必将导致肖塘地区胡杨种群的衰退

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

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 → 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