Subjects: Geosciences >> Geography submitted time 2021-12-14 Cooperative journals: 《干旱区地理》
Abstract： 青海湖与祁连山毗邻区域生态旅游资源保护与保护性利用，已成为青海省以国家公园为主 体的自然保护地体系示范省建设的重要组成部分。选取青海湖与祁连山毗邻区域为研究对象，在实际调查的基础上，依据国家公园理念下的资源特性，采用 ArcGIS 空间叠加分析、德尔菲法、AHP (Analytic hierarchy process)层次分析法，对区域内生态旅游资源进行梳理与分类评价。经评价定 级，区域内生态旅游资源级别分为 5 级，游憩资源单体特品级即五级 1 处；优良级 30 处，其中四级 8 处、三级 22 处；普通级 48 处，其中二级 32 处、一级 16 处。研究表明：在国家公园理念下，生态旅游资源评价指标体系要素层权重前三名依次是旅游功能和价值、人文特色、生态环境，评价层选取了国家公园资源属性的因子。可以看出，国家公园首要功能原真性和完整性指标因子是评价指标因 子选取的关键点。旨在为拟建青海湖国家公园功能区划定提供数据支撑，为国土空间禁止开发区 域的生态旅游资源评价提供方法，其研究视角和路径对国家公园理念下游憩资源深度保护和利用 具有借鉴作用。
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2020-09-28 Cooperative journals: 《计算机应用研究》
Abstract： Based on convolution neural network, this paper proposed a new asymmetric two branch underwater biological classification model to solve the problems of low visibility, poor illumination conditions and no obvious differences among species in the underwater environment. In the model, the interactive branch used different convolution neural network to extracted local features and interacted with local features through the interactive module to enhanced the classification model. Convolutional neural network branch could effectively learned the global characteristics of the target and made up for the global information ignored in the interactive branch. Finally, this model obtains 98.9%, 98.3% and 97.9% of the accuracy on the three data sets of fish4 knowledge (f4k) , Eilat and RAMAS, which are significantly improved compared with the previous methods. visual interpretation also verifies that the model can effectively capture local features and eliminates the background influence. Finally, it shows that the model has good classification performance in underwater environment.
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. submitted time 2018-01-05 Cooperative journals: 《工程热物理学报》
Abstract：在实际运行过程中，槽式太阳能集热器的聚光过程可能受到太阳光入射角、安装误差、镜面误差和跟踪误差等各种实际因素的影响。本文用空间坐标变换的方法结合蒙特卡罗光线追踪法，分别计算出了各种实际因素单独存在时和多种实际因素耦合时的槽式集热器热流分布。结果显示，安装误差和跟踪误差使聚焦热流的不均匀性增大，镜面误差使聚焦热流的不均匀性减小；计算出的实际因素耦合热流分布，可以为槽式集热器光学性能和热性能的分析提供依据。
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-11-07 Cooperative journals: 《工程热物理学报》
Abstract： The concentration process of a parabolic trough collector can be affected by incidence angle, installation error, reflector slope error and tracking error in operation. The coordinate transformation method and the Monte Carlo Ray Trace method are integrated to compute heat flux distributions under individual and coupled optical errors respectively in this study. It is shown that installation error and tracking error increase the non-uniformity of the heat flux distribution while reflector slope error tends to decrease it. Besides, the heat flux distribution under coupled optical errors can provide foundations for thermal and optical analysis of parabolic trough collectors.
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-11-07 Cooperative journals: 《工程热物理学报》
Abstract：本文基于300MW燃煤电厂的设计参数，针对四种典型燃煤电厂碳减排系统进行了发电量和碳减排量的比较。同时，从经济性角度分析且比较了四种燃煤电厂碳减排系统的均化发电成本((LCOE)和碳移除成本((COR)。结果显示在碳捕集率为so%条件下，当碳捕集设备的价格降低到原价的70%且有机朗肯循环(ORC)设备价格低于s06s元/kW时，太阳能ORC辅助碳减排的发电成本比太阳能直接辅助碳捕集系统低，此时太阳能ORC辅助系统在经济性上具备竞争力。
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-10-17 Cooperative journals: 《工程热物理学报》
Abstract：制约碳捕集技术实用化的重要瓶颈在于捕集能耗过高,而热力学是能源系统效能分析的有力工具。基于将热力学研究方法应用到碳捕集技术效能分析的思想,本文以变温吸附碳捕集为例,按照"物性-过程-冷热源-循环"顺序,完成热力学碳泵循环(TCPC)的构建,进而考察循环参数对总能耗和第二定律效率的影响。结果显示;循环能耗主要受循环温度、吸附剂和吸附相等影响,吸附相显热大约占循环总能耗的2%;第二定律效率区间为13.91%~21.21%,具有较高节能潜力;TCPC作为一种基于热力学思想的"量化规尺",可对碳捕集技术展开效能分析,进而对影响循环总能耗的主要因素进行归纳,并可通过第二定律效率对技术成熟度进行判断,有效挖掘碳捕集技术的节能潜力。
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