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Residual levels and health risk assessment of trace metals in Chinese resident diet

Journal of Environmental sciences 2024年第2期136卷 451-459页

作者： Yubing Dai Shuai Sun Rong Cao Haijun Zhang Jiping Chen ningbo Geng CAS Key Laboratory of Separation science for Analytical Chemistry Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Shenyang Pharmaceutical university Shenyang 110016China university of Chinese Academy of sciences Beijing 100049China

Large-scale metal contamination across the food web is an intractable problem due to increasing pollutant emissions,atmospheric transport,and dry and wet deposition of *** present study focus on several trace metals that are rarely studied but have special toxicity,including tin(Sn),antimony(Sb),gold(Au),hafnium(Hf),palladium(Pd),platinum(Pt),ruthenium(Ru),tellurium(Te)and iridium(Ir).We investigated trace metals residues and distribution characteristics,and further evaluated the potential health risks from major daily food intakes in 33 cities in ***,Sb,Ir,Hf,and Au were frequently detected in food samples with the concentrations ranged from ND(not detected)to 24.78μg/kg ww(wet weight).Eggs exhibited the highest residual level of all detected metals(13.70±14.70μg/kg ww in sum),while the lowest concentrations were observed in vegetables(0.53±0.17μg/kg ww in sum).Sn accounting for more than 50%of the total trace metals concentration in both terrestrial and aquatic animal origin *** terrestrial plant origin foods,Sn and Ir were the most abundant *** and Au were the most abundant elements in egg *** addition,Sb and Ir showed a clear trophic dilution effect in terrestrial environments,while in aquatic ecosystems,Sn,Hf,and Au exhibited obvious trophic amplification *** calculated average estimated daily intake(EDI)via food consumption in five regions of china was 0.09μg/(kg·day),implying the health risk of aforementioned elements was acceptable.

关键词： Trace metals Accumulation characteristics Dietary exposure Estimated daily intake(EDI)

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Siliceous mesocellular foam supported Cu catalysts for promoting non-thermal plasma activated CO_(2) hydrogenation toward methanol synthesis

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Frontiers of Chemical science and Engineering 2024年第7期18卷 55-65页

作者： Yi Chen Shaowei Chen Yan Shao Cui Quan ningbo Gao Xiaolei Fan Huanhao Chen State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China School of Environmental science and Engineering Nanjing Tech UniversityNanjing 211816China School of Energy and Power Engineering Xi’an Jiaotong UniversityXi’an 710049China Department of Chemical Engineering School of EngineeringThe University of ManchesterManchester M139PLUK Nottingham ningbo china Beacons of Excellence Research and Innovation Institute University of Nottingham Ningbo ChinaNingbo 315048China Institute of Wenzhou Zhejiang UniversityWenzhou 325006China

Electrified non-thermal plasma (NTP) catalytic hydrogenation is the promising alternative to the thermal counterparts, being able to be operated under mild conditions and compatible with green electricity/hydrogen. Rational design of the catalysts for such NTP-catalytic systems is one of the keys to improve the process efficiency. Here, we present the development of siliceous mesocellular foam (MCF) supported Cu catalysts for NTP-catalytic CO_(2) hydrogenation to methanol. The findings show that the pristine MCF support with high specific surface area and large mesopore of 784 m2·g−1 and ~8.5 nm could promote the plasma discharging and the diffusion of species through its framework, outperforming other control porous materials (viz., silicalite-1, SiO_(2), and SBA-15). Compared to the NTP system employing the bare MCF, the inclusion of Cu and Zn in MCF (i.e., Cu1Zn1/MCF) promoted the methanol formation of the NTP-catalytic system with a higher space-time yield of methanol at ~275 μmol·g_(cat)^(−1)·h^(−1) and a lower energy consumption of 26.4 kJ^(−1)·mmol_(CH_(3)OH)^(-1) (conversely, ~225 μmol·g_(cat)^(−1)·h^(−1) and ~71 kJ^(−1)·mmol_(CH_(3)OH)^(-1), respectively, for the bare MCF system at 10.1 kV). The findings suggest that inclusion of active metal sites (especially Zn species) could stabilize the CO_(2)/CO-related intermediates to facilitate the surface reaction toward methanol formation.

关键词： non-thermal plasma(NTP)catalysis Cu catalyst CO_(2)hydrogenation methanol siliceous mesocellular foam(MCF)

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Anti-biofilm and anti-virulence potential of cell free supernatant of Akkermansia muciniphila against Salmonella

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Food science and Human Wellness 2024年第5期13卷 2677-2689页

作者： Jiaxiu Liu Wenxiu Zhu Huanhuan Liu Xiaomeng Ren ningbo Qin Xiaodong Xia National Engineering Research Center of Seafood School of Food Science and TechnologyDalian Polytechnic UniversityDalian 116034China

Akkermansia muciniphila is one of the commensals residing within the mammalian gut and co-evolving with the *** studies have demonstrated the benefits of *** in ameliorating metabolic disorders,while little is known about the antimicrobial potential of *** against ***,we examined the antimicrobial and anti-virulence properties of cell free supernatant(CFS)of *** against Salmonella *** retarded bacterial growth and inhibited the motility of *** SL1344 and *** *** dose-dependently reduced cell hydrophobicity and auto-aggregation of both ***,CFS from *** significantly attenuated biofilm *** with untreated bacteria,CFS-treated bacteria significantly decreased adhesion and invasion to Caco-2 cells,and reduced intracellular survival in *** maintained antimicrobial properties after treatment with high temperatures and various proteases,while it lost its antimicrobial activity after pH *** chromatography-mass spectrometry(GC-MS)confirmed that *** produced a certain amount of acetate and propionate,and ultra-high-performance liquid chromatography-mass spectrometry(UHPLCMS)identified other organic acids and metabolites in *** summary,CFS from *** exhibited anti-biofilm and anti-virulence properties against Salmonella and could be potentially utilized in the food industry for controlling Salmonella contamination and reducing infection.

关键词： Akkermansia muciniphila Salmonella Biofilm Motility Short-chain fatty acid Adhesion Invasion

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Embedding Perovskite in Polymer Matrix Achieved Positive Temperature Response with Inversed Temperature Crystallization

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Energy & Environmental Materials 2024年第5期7卷 361-371页

作者： Meiting Peng Xue Guan Yingzhu Wu Nan Zhang Qi Feng Liyong Tian Yancheng Wu Yangfan Zhang Feng Gan Fuqin Deng Meilin Huang Guichuan Xing ningbo Yi College of Textile science and Engineering Wuyi University Institute of Applied Physics and Materials Engineering University of Macau School of Applied Physics and Materials Wuyi University faculty of Intelligent Manufacturing Wuyi University

Organic perovskites are promising semiconductor materials for advanced photoelectric applications. Their fluorescence typically shows a negative temperature coefficient due to bandgap change and structural instability. In this study, a novel perovskite-based composite with positive sensitivity to temperature was designed and obtained based on its inverse temperature crystallization, demonstrating good flexibility and solution processability. The supercritical drying method was used to address the limitations of annealing drying in preparing high-performance perovskite. Optimizing the precursor composition proved to be an effective approach for achieving high fluorescence and structural integrity in the perovskite material. This perovskite-based composite exhibited a positive temperature sensitivity of28.563%℃-1for intensity change and excellent temperature cycling reversibility in the range of 25–40℃in an ambient environment. This made it suitable for use as a smart window with rapid response. Furthermore, the perovskite composite was found to offer temperature-sensing photoluminescence and flexible processability due to its components of perovskite-based compounds and polyethylene oxide. The organic precursor solvent could be a promising candidate for use as ink to print or write on various substrates for optoelectronic devices responding to temperature.

关键词： flexibility inversed temperature crystallization perovskite positive temperature response

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Criteria for Regularity of Elliptic Diffusion Processes and It’s Application

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Wuhan university Journal of Natural sciences 2005年第2期10卷 347-350页

作者： LI Bo 1,2 , ZHANG Xiao-min 3 1.School of Mathematics and Statistics,Huazhong Normal university,Wuhan 430079,Hubei,china 2.School of Mathematics and Statistics, Wuhan university, Wuhan 430072, Hubei, china 3.faculty of science,ningbo university,ningbo 3.5211,zhejiang, china School of Mathematics and Statistics Huazhong Normal University Wuhan Hubei China School of Mathematics and Statistics Wuhan University Wuhan Hubei China faculty of science Ningbo University Ningbo Zhejiang China

The cone condition for x to be tegular for B under the elliptic diffusionprocess was proved. We also gave a necessary and sufficient condition for 0 to be regular for thornunder the elliptic diffusion process.

关键词： regular capacity thorn diffusion process

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基于最大压强控制的交叉口自动驾驶汽车和行人管理方法

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华南理工大学学报（自然科学版） 2024年第2期52卷 124-135页

作者：曹宁博赵利英长安大学运输工程学院陕西西安710061 西安理工大学经济与管理学院陕西西安710048

为提高交叉口自动驾驶汽车和行人的管理水平,进而改善交通流的运行效率和稳定性,文中基于最大压强控制和自动驾驶汽车轨迹规划方法构建了交叉口自动驾驶汽车和行人管理方法。首先,综合考虑行人到达率、人行横道尺寸、等待时间和行人到... 详细信息

为提高交叉口自动驾驶汽车和行人的管理水平,进而改善交通流的运行效率和稳定性,文中基于最大压强控制和自动驾驶汽车轨迹规划方法构建了交叉口自动驾驶汽车和行人管理方法。首先,综合考虑行人到达率、人行横道尺寸、等待时间和行人到达分布规律等对行人的影响,利用概率分布函数对行人排队长度进行建模,并利用估计的行人排队长度,基于最大压强控制方法构建了交叉口自动驾驶汽车和行人排队长度管理方法;然后,为帮助交叉口内部自动驾驶汽车避免碰撞并获取最佳运动轨迹,结合最大压强控制方法与已有交叉口自动驾驶汽车轨迹规划方法,在控制交叉口自动驾驶汽车和行人排队长度的基础上,同时对自动驾驶汽车轨迹进行规划;最后,利用Python联合SUMO开源交通仿真软件对模型进行验证,仿真持续2h。仿真结果表明,在不同自动驾驶汽车和行人需求条件下,该自动驾驶汽车和行人管理方法的加入不仅能够实现对自动驾驶汽车运动轨迹的规划控制,而且能够迅速稳定和降低它们的延误与排队长度,并能改善交叉口运行效率。

关键词：自动驾驶汽车行人最大压强控制轨迹规划管理方法

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A detection method for logic functions suitable for dual-logic synthesis

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Progress in Natural science:Materials International 2009年第10期19卷 1311-1315页

作者： Yinshui Xia,Fei Sun,Keyi Mao The faculty of Information science & Engineering,ningbo university,ningbo 3.5211,china The faculty of Information science & Engineering Ningbo University Ningbo 315211 China

Logic functions can be implemented in either AND/OR/NOT-based traditional Boolean(TB) logic or AND/XOR-based Reed-Muller(RM) *** the majority of logic functions,it will be beneficial to be partially implemented in both TB logic and RM logic,called *** this paper,a detection condition favoring dual-logic synthesis is proposed.A corresponding detection algorithm is developed and implemented in *** algorithm is applied to test a set of MCNC91 benchmarks for verifying the *** results show that the proposed algorithm is more efficient than published ones.

关键词： Logic synthesis Boolean logic Reed-Muller logic Detection method

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Analytical solution and semi-analytical solution for anisotropic functionally graded beam subject to arbitrary loading

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science china(Physics,Mechanics & Astronomy) 2009年第8期52卷 1244-1256页

作者： HUANG DeJin1,2,DING HaoJiang1 & CHEN WeiQiu3 1 Key Laboratory of Soft Soils and Geoenvironmental Engineering,Ministry of Education,zhejiang university,Hangzhou 310027,china 2 faculty of Engineering,ningbo university,ningbo 3.5211,china 3 Department of Engineering Mechanics,zhejiang university,Hangzhou 310027,china Key Laboratory of Soft Soils and Geoenvironmental Engineering Ministry of Education Zhejiang University Hangzhou China faculty of Engineering Ningbo University Ningbo China Department of Engineering Mechanics Zhejiang University Hangzhou China

Analytical and semi-analytical solutions are presented for anisotropic functionally graded beams subject to an arbitrary load,which can be expanded in terms of sinusoidal *** plane stress problems,the stress function is assumed to consist of two parts,one being a product of a trigonometric function of the longitudinal coordinate(x) and an undetermined function of the thickness coordinate(y),and the other a linear polynomial of x with unknown coefficients depending on *** governing equations satisfied by these y-dependent functions are *** expressions for stresses,resultant forces and displacements are then deduced,with integral constants determinable from the boundary *** the analytical solution is derived for the beam with material coefficients varying exponentially or in a power law along the thickness,the semi-analytical solution is sought by making use of the sub-layer approximation for the beam with an arbitrary variation of material parameters along the *** present analysis is applicable to beams with various boundary conditions at the two *** numerical examples are presented for validation of the theory and illustration of the effects of certain parameters.

关键词： anisotropic material functionally graded arbitrary loading stress function analytical solution semi-analytical solution

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基于自适应拟合的桥梁影响线提取方法

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铁道科学与工程学报 2024年第5期21卷 1909-1918页

作者：石爽王灿王宁波安徽三联集团博士后工作站安徽合肥230601 中南大学土木工程学院湖南长沙410075

桥梁影响线(IL)被广泛用于动态称重、结构评估、损伤识别等领域,如何从桥梁实测响应中准确提取桥梁影响线至关重要。为此,提出一种自适应拟合算法,用于从车辆过桥响应中提取高精度、准静态的桥梁影响线。从多车轴对桥梁的作用机理出发,... 详细信息

桥梁影响线(IL)被广泛用于动态称重、结构评估、损伤识别等领域,如何从桥梁实测响应中准确提取桥梁影响线至关重要。为此,提出一种自适应拟合算法,用于从车辆过桥响应中提取高精度、准静态的桥梁影响线。从多车轴对桥梁的作用机理出发,通过矩阵运算获取桥梁初始影响线。随后,采用自适应拟合算法来消除初始影响线中的波动干扰成分,从而提取高精度、准静态的桥梁影响线。开展静载和移动荷载模型桥试验,以静载实测影响线为基准,与移动荷载试验所提取的影响线作对比,验证文中自适应拟合算法的可行性。最后,通过与既有影响线提取方法进行比较,深入探讨了多种算法在波动性、精确性和计算速度上的优劣,验证了自适应拟合算法在提取桥梁影响线上的优势。研究结果表明:桥梁实测响应中包含了静态成分和波动成分,自适应拟合算法可较好地提取准静态桥梁影响线。该算法可根据原始响应的波动程度自动选取合适的数据段进行拟合,通过调节参数λ达到平滑的效果,同时保留数据局部信息。所提取的影响线不仅在精度上较既有方法存在一定优势,计算速度也较为理想,可在2~3次迭代后达到较高精确度。提出的基于自适应拟合的桥梁影响线提取方法为影响线的广泛应用奠定了基础。

关键词：桥梁影响线移动荷载试验自适应拟合迭代拟合信号处理

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进气畸变对重型燃气轮机燃压缸流动特性影响

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清华大学学报（自然科学版） 2024年第1期64卷 90-98页

作者：石云姣赵宁波郑洪涛哈尔滨工程大学动力与能源工程学院哈尔滨150001

针对重型燃气轮机的压气机和燃烧室匹配中存在的燃压缸进气流场畸变问题,采用数值模拟方法对燃压缸在不同进口畸变模式、畸变位置和畸变度条件下的流动特性和性能变化规律进行分析。结果表明:进气畸变模式中的周向畸变相比径向畸变会明... 详细信息

针对重型燃气轮机的压气机和燃烧室匹配中存在的燃压缸进气流场畸变问题,采用数值模拟方法对燃压缸在不同进口畸变模式、畸变位置和畸变度条件下的流动特性和性能变化规律进行分析。结果表明:进气畸变模式中的周向畸变相比径向畸变会明显削弱燃压缸的整流效果,导致总压损失和畸变度升高;随着径向畸变速度峰值出现位置下移,进口段的气流分离位置后移,出口截面下侧来流高速区面积和速度峰值增加;同种畸变模式下,进口畸变度的增加对流场分布特性影响较小,但会增加总压损失和出口截面畸变度。

关键词：重型燃气轮机燃压缸进气畸变数值模拟

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