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Determination of aniline derivatives in water samples after preconcentration with oxidized multiwalled

Hideyuki KATSUMATA, Yuta ODA, Satoshi KANECO, Tohru SUZUKI, Kiyohisa OHTA

《化学科学与工程前沿（英文）》 2012年第6卷第3期页码 270-275 doi: 10.1007/s11705-012-1298-x

摘要： A sensitive and selective preconcentration method using solid-phase extraction (SPE) disk made from oxidized multiwalled carbon nanotubes (OMWCNTs), has been developed for the determination of aniline derivatives, such as 2-nitroaniline (2-NA), 4-nitroaniline (4-NA), and 2,4-dichloroaniline (2,4-DCA) in water samples. Anilines were extracted onto OMWCNT disk and then determined by high performance liquid chromatography (HPLC) with UV detector. Several parameters on the recovery of the analytes were investigated. The experimental results showed that it was possible to obtain quantitative analysis when the solution pH was 8 using 200 mL of validation solution containing 2 μg of anilines and 10 mL of acetonitrile/ethanol (8/2, v/v) as an eluent. Relative standard deviations for five determinations were 7.5% (2-NA), 6.5% (4-NA) and 3.8% (2,4-DCA) under optimum conditions. The linear range of calibration curves were 0.5 ng·mL to 15 ng·mL for each analyte with good correlation coefficients. The detection limits (3S/N) of 2-NA, 4-NA and 2,4-DCA were 30 pg·mL , 31 pg·mL and 26 pg·mL , respectively. Our method was successfully applied to the determination of aniline compounds in river water sample with high precision and accuracy.

关键词： aniline determination solid-phase extraction oxidized multiwalled carbon nanotubes water sample HPLC-UV

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Permeability testing of drilling core sample from pavement

WANG Suda, TANG Zhengguang, NING Xiaojun, WU Peiguan, XING Pingyi

《结构与土木工程前沿（英文）》 2008年第2卷第4期页码 391-394 doi: 10.1007/s11709-008-0045-3

摘要： The permeability coefficient of pavement material is a very important parameter in designing the drainage of pavement structures and is also used to evaluate the quality of road construction. New equipment is used to measure the permeability coefficient of the pavement drilling core sample and relevant testing methods are introduced. Testing drilling core samples from a certain highway of Yunnan province has been proven to be feasible. The test results are also analyzed.

关键词： province material feasible permeability coefficient equipment

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Air bearing center cross gap of neutron stress spectrometer sample table support system

Yang LI,Yunxin WU,Hai GONG,Xiaolei FENG

《机械工程前沿（英文）》 2016年第11卷第4期页码 403-411 doi: 10.1007/s11465-016-0405-y

摘要：

A support system is the main load-bearing component of sample table for neutron stress spectrometer, and air bearing is an important element of a support system. The neutron stress spectrometer sample table was introduced, and the scheme for air bearing combination was selected. To study the performance of air bearing center cross gap, finite element models (FEMs) were established based on air motion and Reynolds equations, effects of air supply pressure, and gap parameters on the overturning moment and bearing capacity of air bearing center cross gap were analyzed. Results indicate that the width, depth, and height differences of the marble floor gap played important roles in the performance of the air bearing. When gap width is lesser than 1 mm and gap depth is lower than 0.4 mm, bearing capacity and overturning moment would vary rapidly with the variation of the width and depth. A gap height difference results in the bearing capacity dropping rapidly. The FEM results agree well with experimental results. Further, findings of the study could guide the design of the support system and marble floor.

关键词： neutron stress spectrometer sample table support system air bearing center cross gap simulation experiment

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A case study on sample average approximation method for stochastic supply chain network design problem

Yuan WANG, Ruyan SHOU, Loo Hay LEE, Ek Peng CHEW

《工程管理前沿（英文）》 2017年第4卷第3期页码 338-347 doi: 10.15302/J-FEM-2017032

摘要： This study aims to solve a typical long-term strategic decision problem on supply chain network design with consideration to uncertain demands. Existing methods for these problems are either deterministic or limited in scale. We analyze the impact of uncertainty on demand based on actual large data from industrial companies. Deterministic equivalent model with nonanticipativity constraints, branch-and-fix coordination, sample average approximation (SAA) with Bayesian bootstrap, and Latin hypercube sampling were adopted to analyze stochastic demands. A computational study of supply chain network with front-ends in Europe and back-ends in Asia is presented to highlight the importance of stochastic factors in these problems and the efficiency of our proposed solution approach.

关键词： supply chain network stochastic demand sampling average approximation Bayesian bootstrap Latin hypercube sampling

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Management innovation of Chang’e-5 project

《工程管理前沿（英文）》 2021年第8卷第4期页码 620-626 doi: 10.1007/s42524-021-0165-1

关键词： lunar exploration sample return systems engineering project management

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Detailed analysis of PCBs and PCDD/Fs impurities in a dielectric oil sample (ASKAREL Nr 1740) from an

Jun HUANG, Yamei HUI, Toru MATSUMURA, Gang YU, Shubo DENG, Makoto YAMAUCHI, Changmin WU, Norimasa YAMAZAKI

《环境科学与工程前沿（英文）》 2014年第8卷第2期页码 195-204 doi: 10.1007/s11783-013-0527-y

摘要： Homolog and congener profiles of polychlorinated biphenyls (PCBs), polychlorinated dibenzo- - dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in commercial PCBs formulations are useful information for the source appointment of PCBs contamination as well as the risk assessment caused by potential exposure. Dielectric oil (ASKAREL Nr 1740) in an imported transformer found in China was sampled and analyzed by isotope dilution technology using high resolution gas chromatography-high resolution mass spectrometry (HRGC/HRMS). The detailed homolog and congener profiles of PCBs obtained were compared with those of known Aroclor formulations. High similarity in the homolog profile between the oil sample and Aroclor 1260 was found, with the hexachlorinated and heptachlorinated biphenyls accounting for more than 80.2% of the total PCBs concentration. Severn indicator PCBs contribute about 30%, while 12 PCB congeners (i.e., #153, #143, #168, #180, #149, #165, #138, #170, #190, #187, #174, #181) account for more than 50% of the total PCB concentrations. Total concentration of PCDDs, PCDFs and dioxin-like PCBs (DL-PCBs) was found to be 740 ng TEQ/g, of which 620 ng TEQ/g came from DL-PCBs. The contribution of PCDDs to the total TEQ was neglectable. The concentration of PCDFs homologs follows the order of OCDF>HxCDFs>HpCDFs>PeCDFs>TeCDFs, which is in consistence with the previous study on Aroclor 1260. Three DL-PCBs congeners (i.e., #118, #156, #157) accounted for 77% of the total concentration of DL-PCBs, also they contribute 72% in the TEQ caused by DL-PCBs.

关键词： profiles of polychlorinated biphenyls (PCBs) polychlorinated dibenzo-p-dioxins (PCDDs) polychlorinated dibenzofurans (PCDFs) Askarel transformer insulating fluid

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Dynamic behavior of stormwater quality parameters in South Texas

Xubin PAN, Jingyi ZHANG, Wei-Ta FANG, Kim D. JONES

《环境科学与工程前沿（英文）》 2012年第6卷第6期页码 825-830 doi: 10.1007/s11783-012-0465-0

摘要： To control water impairment in urban stormwater, it is important to evaluate changing patterns of water quality parameters in stormwater runoff. Thus, the authors performed a series of experiments to investigate the dynamics of common water parameters during storm events in semi-arid areas, with multiple samples collected and analyzed in field stormwater applications. At this field monitoring site within McAuliffe Park, McAllen, Texas, in the United States, a storm event increased the concentrations of ( ), but this event represented a decreasing trend over the entire event period. Besides, peak intensity of different pollutants in the stormwater runoff occurred at different times other than at any peak flows, representing a complexity of the temporal and spatial measurements. Multi-sample per-event approaches recommended based on the complexity of the hydrograph and different peak intensity times of pollutants. In addition, high bacteria and total suspended solids (TSS) concentrations in the initial stage of the storm event should be considered when designing Best Management Practices (BMPs) and Low Impact Developments (LIDs). New strategies and solutions for addressing ecohydrological challenges should be proposed to avoid collateral damages to their both common wealth in ecosystems and human well-beings.

关键词： event mean concentration first flush multi-sample per event ecohydrology

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基于Wasserstein GAN的新一代人工智能小样本数据增强方法——以生物领域癌症分期数据为例 Article

刘宇飞, 周源, 刘欣, 董放, 王畅, 王子鸿

《工程（英文）》 2019年第5卷第1期页码 156-163 doi: 10.1016/j.eng.2018.11.018

摘要：

以大数据为基础的深度学习算法在推动新一代人工智能快速发展中意义重大。然而深度学习的有效利用对标注样本数量的高度依赖，使得深度学习在小样本数据环境下的应用受到制约。本研究提出了一种基于生成对抗网络（generative adversarial network，GAN）和深度神经网络（deep neural network，DNN）分类器的方法。首先，将原始样本划分为训练集样本和测试集样本，采用训练集样本训练GAN 后生成模拟样本数据，扩增训练集样本规模；然后，使用模拟样本训练DNN 分类器；最后，使用测试集样本测试分类器，并通过指标验证该方法在小样本多分类问题下的有效性。作为实证案例，将该方法应用于生物领域癌症分期识别，结果表明该方法比传统方法获得更高的识别准确率。同时，该方法是一次将基于原始样本的经典统计机器学习分类方法转变为基于数据增强的深度学习分类方法的尝试。本研究有助于探索以深度学习为代表的新一代人工智能技术在应用范围与应用效果方面的潜力。这将对各领域全面推进新一代人工智能的发展具有重要意义。

关键词：人工智能生成式对抗网络深度神经网络小样本癌症

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Social media and mobility landscape: Uncovering spatial patterns of urban human mobility with multi source data

Yilan Cui, Xing Xie, Yi Liu

《环境科学与工程前沿（英文）》 2018年第12卷第5期 doi: 10.1007/s11783-018-1068-1

摘要：

Check-in and survey data are explored to identify personal activity-specific places.

Ways for detecting and moderating sample bias of Weibo check-in data is proposed.

A graphic representation of urban activity intensity in Beijing, China is presented.

The potential application of Weibo check-in data for urban analysis is introduced.

关键词： Social media Human mobility Population bias Sample reconstruction Data integration

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锈蚀样件在动态钠回路中的实验研究

刘泽军,孙树海

《中国工程科学》 2012年第14卷第11期页码 99-102

摘要：

中国实验快堆的蒸汽发生器在安装过程中发现其中一个蒸发器和一个过热器壳程内存在较为严重的锈蚀现象。为此中国原子能研究院快堆工程部钠工艺研究室进行了钠中静态浸泡实验，但是静态除锈温度要求较高，快堆现场在运行前不易达到该要求。为了进一步研究蒸汽发生器锈蚀表面在动态钠中的行为，为现场进行蒸汽发生器的清洗提供依据，快堆工程部决定进行蒸汽发生器锈蚀样件动态清洗实验。本实验利用“PEC堆电磁泵特性实验钠回路”，模拟蒸汽发生器的运行工况，前后对比样件的照片，得出不同条件下的清洗效果,为中国实验快堆蒸汽发生器现场在线清洗提供依据。

关键词：蒸汽发生器样件锈蚀动态清洗

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液体样品预处理装置中黏稠液体定量转移结构创新

曹国忠,檀润华,张鹏,杨志岩

《中国工程科学》 2010年第12卷第1期页码 30-35

摘要：

为解决液体样品预处理装置中罐体之间黏稠液体定量转移无法准确实现的问题，综合应用发明问题解决理论(TRIZ)和约束理论(TOC)进行问题分析与求解。从系统的角度分析了样品预处理装置的组成及要素间的相互关系，基于TRIZ进化模式和TOC必备树确定了样品预处理装置的核心问题，应用基于TRIZ的计算机辅助创新软件InventionTool 3.0中的冲突模块、标准解模块和效应模块进行了设计方案的选择、评价和修正，提出了实现液体样品预处理装置中黏稠液体定量转移的原理解。

关键词： TRIZ TOC 样品预处理装置改进设计

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基于正交实验的BP神经网络预测研究

蔡安辉,刘永刚,孙国雄

《中国工程科学》 2003年第5卷第7期页码 67-71

摘要：

用不同的L₉（3⁴）正交实验方案结果作为训练学习样本集，对BP神经网络预测应用过程的策略进行了探讨，结果表明：完备的正交实验样本集是基本训练学习单元，在完备的正交实验样本集上添加或减少样本数量，所预测的结果是不可靠的；在同一类型、同一实验的条件下，完备的信息量大的正交实验样本集，能以很高的精度预测完备的信息量小的正交实验样本集；提出了一条新的实验设计思路——通过实验得出一个完备的正交实验样本集，通过计算机用BP神经网络就可以把与已知样本集有相同影响因素和水平的所有样本的值以相当高的精度预测出来，从而大大节省时间和劳力。

关键词： BP神经网络正交实验策略实验设计思路样本集

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利用证候要素架构中医人工智能诊疗模型

王阶, 段练, 李洪峥, 刘金垒, 陈恒文

《工程（英文）》 2022年第8卷第1期页码 29-32 doi: 10.1016/j.eng.2021.06.014

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深海生物资源开发装备发展研究

冯景春,梁健臻,张偲,杨志峰,祝振昌

《中国工程科学》 2020年第22卷第6期页码 67-75 doi: 10.15302/J-SSCAE-2020.06.009

摘要：

深海孕育了地球上规模最大、远未被详细认知的生态系统，蕴藏着极为丰富且兼具特殊功能的生物资源。深海装备是保障深海生物资源绿色、安全、有序开发的关键支撑。为了厘清深海生物资源开发装备的基本特征、发展特色和技术瓶颈，明确深海生物资源开发装备的未来发展方向和着力点，本文分析了深海生物资源开发对装备的技术需求特征，梳理了深海生物资源开发装备的发展现状；盘点了我国深海生物资源开发装备的基本情况，研判了领域内装备发展面临的困难和挑战。针对我国深海生物资源开发装备缺乏统一标准、试验平台和成果转化率不足等问题，提出创新体系、通用技术、转化平台、国际合作等方面的发展建议，以期从装备发展的视角为我国可持续开发深海生物资源提供方向参照。

关键词：深海生物资源原位观测取样原位实验