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Effects of riparian land use on water quality and fish communities in the headwater stream of the Taizi

Sen DING, Yuan ZHANG, Bin LIU, Weijing KONG, Wei MENG

《环境科学与工程前沿（英文）》 2013年第7卷第5期页码 699-708 doi: 10.1007/s11783-013-0528-x

摘要： Riparian land use remains one of the most significant impacts on stream ecosystems. This study focuses on the relationship between stream ecosystems and riparian land use in headwater regions. Four riparian land types including forest, grassland, farmland, and residential land were examined to reveal the correlation between stream water and fish communities in headwater streams of the Taizi River in north-eastern China. Four land types along riparian of 3 km in length were evaluated at 25, 50, 100, 200 and 500 m widths, respectively. Generally, the results found a significant relationship between riparian land uses and stream water quality. Grassland was positively correlated with water quality parameters (conductivity and total dissolved solids) at scales from 100 to 500 m riparian width. Farmland and residential land was negatively correlated with water quality parameters at scales from 25 to 500 m and from 50 to 200 m riparian widths, respectively. Although the riparian forest is important for maintaining habitat diversity and fish communities, the results found that only fish communities were significantly correlated with the proportion of riparian farmland. Farmland had a positive correlation with individual fish abundance within a riparian corridor of 25 to 50 m, but a negative correlation with fish diversity metrics from 25 to 100 m. This study indicates that effective riparian management can improve water quality and fish communities in headwater streams.

关键词： fish water quality land use riparian buffer headwater stream

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Anensemble method for data stream classification in the presence of concept drift

Omid ABBASZADEH,Ali AMIRI,Ali Reza KHANTEYMOORI

《信息与电子工程前沿（英文）》 2015年第16卷第12期页码 1059-1068 doi: 10.1631/FITEE.1400398

摘要： One recent area of interest in computer science is data stream management and processing. By ‘data stream’, we refer to continuous and rapidly generated packages of data. Specific features of data streams are immense volume, high production rate, limited data processing time, and data concept drift; these features differentiate the data stream from standard types of data. An issue for the data stream is classification of input data. A novel ensemble classifier is proposed in this paper. The classifier uses base classifiers of two weighting functions under different data input conditions. In addition, a new method is used to determine drift, which emphasizes the precision of the algorithm. Another characteristic of the proposed method is removal of different numbers of the base classifiers based on their quality. Implementation of a weighting mechanism to the base classifiers at the decision-making stage is another advantage of the algorithm. This facilitates adaptability when drifts take place, which leads to classifiers with higher efficiency. Furthermore, the proposed method is tested on a set of standard data and the results confirm higher accuracy compared to available ensemble classifiers and single classifiers. In addition, in some cases the proposed classifier is faster and needs less storage space.

关键词： Data stream Classificaion Ensemble classifiers Concept drift

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Changes in Headwater Streamflow from Impacts of Climate Change in the Tibetan Plateau

Zhengxin Bao,Jianyun Zhang,Yanqing Lian,Guoqing Wang,Junliang Jin,Zhongrui Ning,Jiapeng Zhang,Yanli Liu,Xiaojun Wang,

《工程（英文）》 doi: 10.1016/j.eng.2023.05.025

摘要： The Tibetan Plateau (TP) is the headwater of the Yangtze, Yellow, and the transboundary Yarlung Tsangpo, Lancang, and Nujiang Rivers, providing essential and pristine freshwater to around 1.6 billion people in Southeast and South Asia. However, the temperature rise TP has experienced is almost three times that of the global warming rate. The rising temperature has resulted in glacier retreat, snow cover reduction, permafrost layer thawing, and so forth. Here we show, based on the longest observed streamflow data available for the region so far, that changing climatic conditions in the TP already had significant impacts on the streamflow in the headwater basins in the area. Our analysis indicated that the annual average temperature in the headwater basins of these five major rivers has been rising on a trend averaging 0.37 °C·decade−1 since 1998, almost triple the rate before 1998, and the change of streamflow has been predominantly impacted by precipitation in these headwater basins. As a result, streamflow in the Yangtze, Yarlung Tsangpo, Lancang, and Nujiang River headwater areas is on a decreasing trend with a reduction of flow ranging from 3.0–5.9 × 109 m3·decade−1 (−9.12% to −16.89% per decade) since 1998. The increased precipitation in the Tangnahai (TNH) and Lanzhou (LZ) Basins contributed to the increase of their streamflows at 8.04% and 14.29% per decade, respectively. Although the increased streamflow in the headwater basins of the Yellow River may ease some of the water resources concerns, the decreasing trend of streamflow in the headwater areas of the southeastern TP region since 1998 could lead to a water crisis in transboundary river basins for billions of people in Southeast and South Asia.

关键词： Tibetan Plateau Streamflow Change Trend Climate Change

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Residence time distribution and modeling of the liquid phase in an impinging stream reactor

Xingjun WANG, Xianhui HU, Lishun HU, Guangsuo YU, Fuchen WANG,

《化学科学与工程前沿（英文）》 2010年第4卷第3期页码 353-359 doi: 10.1007/s11705-009-0262-x

摘要： Based on some experimental investigations of liquid phase residence time distribution (RTD) in an impinging stream reactor, a two-dimensional plug-flow dispersion model for predicting the liquid phase RTD in the reactor was proposed. The calculation results of the model can be in good agreement with the experimental RTD under different operating conditions. The axial liquid dispersion coefficient increases monotonously with the increasing liquid flux, but is almost independent of gas flux. As the liquid flux and the gas flux increase, the liquid dispersion coefficient of center-to-wall decreases. The axial liquid dispersion coefficient is much larger than that of center-to-wall, which indicates that the liquid RTD is dominated mainly by axial liquid dispersion in the impinging stream reactor.

关键词： RTD liquid dispersion reactor liquid independent

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Chaotic behavior of LNG after stratification in main stream region of storage tank

WANG Jingjing, MA Xiaoqian

《能源前沿（英文）》 2008年第2卷第4期页码 514-518 doi: 10.1007/s11708-008-0076-4

摘要： A study of the chaotic behavior of liquefied natural gas (LNG) after stratification in the main stream region of a storage tank was conducted. Based on non-linear dynamics, a 2-dimensional Rayleigh-Benard convection model was developed to simulate the convection, Lorenz equations of LNG convection were deduced from conservation equations, and the Runge-Kutta method was used to solve the equations. The results showed that when = 1.33, 106 < < 1470, chaos was obtained, which meant that the velocity field and the temperature field were highly unsteady. In addition, the influence of temperature and scale factor on the solutions and the corresponding range of parameters were studied. The results revealed that the chaos in LNG convection resulted from the interaction of buoyancy and viscid forces. A small quantity of heat impacting the storage tank would lead to a strong and unstable convection of LNG in the main stream region.

关键词： Runge-Kutta non-linear corresponding temperature addition

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川江载货汽车滚装运输贡献的评估与发展政策

许茂增,吴旻

《中国工程科学》 2008年第10卷第2期页码 31-34

摘要：

介绍了川江地区的运输环境，阐述了滚装运输产生的行业背景、发展历程和现状；提出以经济、社会、运输、节能、废气排放的指标，评价川江载货汽车滚装运输对区域经济社会发展的贡献，建立了运费节约和能源节约指标的计算模型，并以2005年的统计数据和专项调查数据为基础进行了实际评价。结果表明，川江载货汽车滚装运输兼具降低社会运输成本、节能、环保与生态价值，有助于长江流域经济社会的可持续发展；分析了滚装运输发展的机遇及面临的挑战，提出了促进滚装运输发展的政策和措施。

关键词：川江滚装运输评价指标计算模型发展政策

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工程化仿生血小板膜包覆纳米颗粒阻断金黄色葡萄球菌的细胞毒性并防止致命的全身感染 Article

Jwa-Kyung Kim, Satoshi Uchiyama, Hua Gong, Alexandra Stream, Liangfang Zhang, Victor Nizet

《工程（英文）》 2021年第7卷第8期页码 1149-1156 doi: 10.1016/j.eng.2020.09.013

摘要：

金黄色葡萄球菌（S. aureus）是一种常见的人类病原体，它可以引发严重的侵袭性感染，如菌血症、败血症和心内膜炎，具有较高的发病率和死亡率。然而由于细菌的抗生素耐药性增强，如耐甲氧西林金黄色葡萄球菌（MRSA），加剧了此类细菌的发病率和死亡率。金黄色葡萄球菌的发病机制是由毒素的分泌推动的，如膜损伤孔α毒素，它有不同的细胞靶点，包括上皮细胞、内皮细胞、白细胞和血小板。本文采用人体血小板膜包覆纳米颗粒（PNP）作为一种仿生诱饵策略，来中和金黄色葡萄球菌的毒素，并维持宿主细胞的防御功能。血小板膜包覆纳米颗粒保护血小板免受由金黄色葡萄球菌毒素带来的损伤，维持血小板活化和杀菌活性。血小板膜包覆纳米颗粒也同样保护巨噬细胞免受由金黄色葡萄球菌毒素带来的损伤，支持巨噬细胞进行氧化迸发、产生一氧化氮和维持其杀菌活性，并减少耐甲氧西林金黄色葡萄球菌诱导的中性粒细胞胞外杀菌网络。在感染系统性耐甲氧西林金黄色葡萄球菌的小鼠模型中，血小板膜包覆纳米颗粒制剂减少了血液中的细菌数量并防止小鼠发生死亡。总之，目前的研究结果证明了血小板膜包覆纳米颗粒的治疗优点，如中和毒素、保护细胞和增加宿主对侵袭性金黄色葡萄球菌感染的抵抗力。

关键词：纳米颗粒纳米海绵血小板金黄色葡萄球菌细菌毒素败血症

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PAC在人工流产术后计划生育关爱中的应用

钟慧玲

《中国工程科学》 2014年第16卷第5期页码 31-33

摘要：

文本研究人流后关爱（PAC）在人工流产术后计划生育关爱中的应用。选择2011年1月—2013年1月，武汉市蔡甸区计划生育服务站门诊进行人工流产的260 名病例为分析对象，根据其先后序号按照奇偶顺序分为关爱PAC组和对照组，每组130 例，对PAC组进行流产后关爱指导，而对照组只进行常规处理。一年后，共收回有效问卷248 份，其中关爱组126 份，对照组122 份。PAC组避孕知识和人流后保健知识掌握优良率均高于对照组，生活质量评分有明显优势，而重复流产率明显较低，育龄妇女满意率较高。其差异均有统计学意义（P<0.05）。高价值的PAC关爱，对于减少重复流产的概率和提高生活质量有着积极重要的意义。

关键词：人工流产流产后关爱计划生育关爱效果分析

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Value Engineering/Value Management Model and Application of Aerospace Projects

Wan-hua Qiu,Han-peng Zhang,Ze-Shui Xu,De-Sheng Wu

《工程管理前沿（英文）》 2015年第2卷第4期页码 373-377 doi: 10.15302/J-FEM-2015056

摘要： This paper presents a new space model developed by general value engineering/value management model. The authors take the function analysis, function optimization and function realization of the development object as the basic point, to get the final optimization structure by value evaluation, so as to improve the project quality and reduce the project cost. The final case shows that the application of this model can save about 18% of the time and considerable cost of the usually planned projects under the condition of quality assurance.

关键词： aerospace project value engineering value optimization value stream design structure matrix

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Photothermal materials for efficient solar powered steam generation

Fenghua Liu, Yijian Lai, Binyuan Zhao, Robert Bradley, Weiping Wu

《化学科学与工程前沿（英文）》 2019年第13卷第4期页码 636-653 doi: 10.1007/s11705-019-1824-1

摘要： Solar powered steam generation is an emerging area in the field of energy harvest and sustainable technologies. The nano-structured photothermal materials are able to harvest energy from the full solar spectrum and convert it to heat with high efficiency. Moreover, the materials and structures for heat management as well as the mass transportation are also brought to the forefront. Several groups have reported their materials and structures as solutions for high performance devices, a few creatively coupled other physical fields with solar energy to achieve even better results. This paper provides a systematic review on the recent developments in photothermal nanomaterial discovery, material selection, structural design and mass/heat management, as well as their applications in seawater desalination and fresh water production from waste water with free solar energy. It also discusses current technical challenges and likely future developments. This article will help to stimulate novel ideas and new designs for the photothermal materials, towards efficient, low cost practical solar-driven clean water production.

关键词： solar stream generation plasmonics porous carbon photothermal materials solar energy conversion efficiency water vapor generation rate

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海洋可再生能源的前景 Review

Alistair G. L. Borthwick

《工程（英文）》 2016年第2卷第1期页码 69-78 doi: 10.1016/J.ENG.2016.01.011

摘要：

以化石燃料为基础的发电方式会产生大量二氧化碳，从而导致全球气候变暖。我们需要采取行动减少化石燃料的使用和二氧化碳的排放。海洋能源存在巨大潜力，但是其开发还面临着跨学科的技术、成本、投资、环境影响和政府政策等方面的问题。本文简要介绍了海上风电、潮流、洋流、潮差、波浪能、海洋热能、盐度梯度、生物能等方面的内容，简述了开采海洋可再生能源需要进行研究的领域。这些领域包括能源存储、高级材料、机器人和信息学。本文以可持续性的角度从伦理、立法、监管环境、政府政策、经济、社会和环境制约等方面给出了海洋可再生能源发展的要求，强调我们急需富有专研精神的新一代科学家解决海洋可再生能源面临的重大挑战。

关键词：海洋可再生能源海上风电潮流洋流潮差波浪能海洋热能生物能可持续性

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FAAD：一种无监督快速准确的数据流上多维序列异常检测方法 Regular Papers

Bin LI, Yi-jie WANG, Dong-sheng YANG, Yong-mou LI, Xing-kong MA

《信息与电子工程前沿（英文）》 2019年第20卷第3期页码 388-404 doi: 10.1631/FITEE.1800038

摘要：最近，序列异常检测被广泛应用于许多领域。这些领域中的序列数据在数据流上通常是多维的。设计同时满足检测精度和速度的数据流上多维序列异常检测方法是一个挑战。因为：（1）序列数据和庞大状态空间的维度冗余导致序列建模能力较差；（2）异常检测无法适应数据流的高速性，尤其是概念漂移会降低检测率。一方面，大多数现有序列异常检测方法集中在单维序列。另一方面，多维序列研究主要集中在静态数据集而非数据流。为提高数据流上多维序列异常检测性能，提出一种新型无监督快速和准确异常检测（fast and accurate anomaly detection，FAAD）方法，该方法包括3种算法。首先，采用一种“信息计算和最小生成树聚类”（information calculation and minimum spanning tree cluster，IMC）方法减少冗余维度。其次，为加速模型构建确保数据流上序列的检测率，提出一种“基于索引概率后缀树的随机抽样和子序列划分”（random sampling and subsequence partitioning based on the index probabilistic suffix tree，RSIPST）方法。最后，“基于模型动态调整的异常缓冲”（anomaly buffer based on model dynamic adjustment，ABMDA）方法显著降低数据流中概念漂移的影响。在流平台Storm上实施FAAD检测多维日志审计数据。与现有异常检测方法相比，FAAD在检测精度和速度方面不受概念漂移影响，具有良好性能。

关键词：数据流；多维序列；异常检测；概念漂移；特征选择

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CAESAR竞赛认证加密算法设计分析与安全性评估进展 None

Fan ZHANG, Zi-yuan LIANG, Bo-lin YANG, Xin-jie ZHAO, Shi-ze GUO, Kui REN

《信息与电子工程前沿（英文）》 2018年第19卷第12期页码 1475-1499 doi: 10.1631/FITEE.1800576

摘要： CAESAR竞赛是2013年由美国国家标准与技术研究院（NIST）资助的认证加密算法征集竞赛，旨在征集综合性能和安全性优于AES-GCM的认证加密算法，能够同时实现完整性和机密性。最后入围的算法可能被推荐至工业界并标准化。竞赛分3个轮次，第3轮在2018年结束。本文首先介绍CAESAR竞赛候选算法的设计要求和筛选进展，然后从设计结构和加密模式两方面对最后一轮候选算法进行归类，之后综述了候选算法的综合性能与安全性分析进展，最后探讨了认证加密算法的设计和分析研究趋势。

关键词： CAESAR竞赛；认证加密算法；分组密码；序列密码；哈希函数；安全性评估

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长江干流水下岸坡侵蚀自动识别 Article

颜阁, 程和琴, 姜泽宇, 滕立志, 唐明, 石天, 姜月华, 杨国强, 周权平

《工程（英文）》 2022年第19卷第12期页码 50-61 doi: 10.1016/j.eng.2021.03.027

摘要：

识别河岸侵蚀的风险是确保早期预警和预防或控制包括长江在内的河流集水区崩岸的一项重要挑战。本文引入一种基于地貌要素的算法，通过调整多波束回波探测数据的平坦度来提取河岸侵蚀信息。该算法绘制了10 个水下地貌形态要素，包括坡、坡脚、水平面、脊、顶、谷、凹陷、凸起、坑和坡肩。利用21 个平坦度值构建水下河岸侵蚀特征的识别策略。结果表明：当平坦度为10°时，作为侵蚀载体的岸坡陡坎被坡要素覆盖。平坦度为0°时，冲刷坑和河岸破损由河岸附近的坑要素和岸坡中的凹陷表示。河道水下沙波是加速河岸侵蚀的重要因素，尤其是靠近河岸坡脚的沙波；沙波的临界平坦度为3°。分析了水下地貌形
态要素的分布，并用于绘制河岸侵蚀库存图。分析结果表明，近岸区水深较大，易形成较大的冲刷坑和较长的河岸陡坎。窝崩往往发生在较长的岸坡处，以缩短其长度。经讨论陆地、海洋和河流环境中平坦度值的不同设置，得出的结论是，多样化的平坦度值能够显著识别河流水下地貌形态。因此，本研究为基于平坦度的河流水下地貌形态要素识别提供参考，增强了从大量多波束测深数据定位水下岸坡失稳迹象与风险的能力。

关键词：多波束测深数据形态要素河岸侵蚀水下陡坎冲刷坑崩岸