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Mercury in soil,vegetable and human hair in a typical mining area in China:Implication for human exposure

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Journal of Environmental Sciences 2018年第6期30卷 73-82页

作者： qin Jia Xuemei zhu Yaqiong hao Ziliang Yang qi Wang Haihui Fu Hongjin Yu College of Water Sciences Beijing Normal University Research Institute of Solid Waste Management Chinese Research Academy of Environmental Sciences

Concentrations of total mercury（T-Hg） and methylmercury（MeHg） in soil, vegetables, and human hair were measured in a mercury mining area in central China. T-Hg and MeHg concentrations in soil ranged from 1.53 to 1054.97 mg/kg and 0.88 to 46.52 μg/kg, respectively.T-Hg concentrations was correlated with total organic carbon（TOC） content（R^2= 0.50, p〈0.01）and pH values（R^2= 0.21, p〈0.05）. A significant linear relationship was observed between MeHg concentrations and the abundance of sulfate-reducing bacteria（SRB）（R^2= 0.39, p〈0.05） in *** incubation experiments amended with specific microbial stimulants and inhibitors showed that Hg methylation was derived from SRB activity. T-Hg and MeHg concentrations in vegetables were 24.79 – 781.02 μg/kg and 0.01 – 0.18 μg/kg, respectively; levels in the edible parts were significantly higher than in the roots（T-Hg： p〈0.05; MeHg： p〈0.01）. Hg species concentrations in rhizosphere soil were positively correlated to those in vegetables（p〈0.01）, indicating that soil was an important source of Hg in vegetables. Risk assessment indicated that the consumption of vegetables could result in higher probable daily intake（PDI） of T-Hg than the provisional tolerable daily intake（PTDI） for both adults and children. In contrast, the PDI of MeHg was lower than the reference dose. T-Hg and MeHg concentrations in hair samples ranged from 1.57 to 12.61 mg/kg and 0.04 to 0.94 mg/kg, respectively, and MeHg concentration in hair positively related to PDI of MeHg via vegetable consumption（R^2= 0.39, p〈0.05）, suggesting that vegetable may pose health risk to local residents.

关键词： Mercury Methylmercury Soil Vegetable Human hair

Operating range of magnetic stabilization flow regime for magnetized fluidized bed with Geldart-B magnetizable and nonmagnetizable particles

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Particuology 2022年第1期20卷 90-98页

作者： Weikang hao Quanhong zhu College of Chemical Engineering Hebei University of TechnologyTianjin 300401China qingdao Institue of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao 266101ShandongChina Institute of Process Engineering Chinese Academy of SciencesBeijing 100190China

The magnetic stabilization flow regime could also be created forGeldart-Bnonmagnetizable particles pro-vided some magnetizable particles are introduced and the magnetic field is *** study aimed toexplore the size(d_(pM))and density(ρ_(pM))effects of magnetizable particles on its operating *** upperlimit(Umb;)could not be determined from the △P_(b)-U_(g)↓curve but could from analyzing the variation of △P_(b)-fluctuation with increasing U_(g).Due to the variation of U_(mfH)(lower limit)with d_(pM) and ppw,both U_(mbH)-U_(mfH) and(U_(mbH)-U_(mfH))/U_(mfH) were used to quantify the operating range of magnetic stabilization.U_(mbH)-U_(mfH) varied hardly with ρ_(pM) but increased significantly with decreasing ρ_(pM).(U_(mbH)-U_(mfH))/U_(mfH)increased as d_(pM) or ρ_(pM) *** was more difficult for the nonmagnetizable particles to escape fromthe network formed by the smaller/lighter magnetizable *** the same magnitude of change,dp had a stronger effect than ρ_(pM) on(U_(mbH)-U_(mfH))/U_(mfH).Neither U_(mbH)-U_(mfH) nor(U_(mbH)-U_(mfH):)/Uma variedmonotonously with the minimum fluidization velocity of the magnetizable particles,indicating that nostraightforward criterion for matching the magnetizable particles to the given nonmagnetizable particlescould be established based on their minimum fluidization velocities to maximize the operating range ofmagnetic stabilization.

关键词： Magnetized fluidized bed Binary mixture Magnetic stabilization Operating range Nonmagnetizable particles Magnetization-FIRST

Three-dimensional bioprinting speeds up smart regenerative medicine

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National Science Review 2016年第3期3卷 331-344页

作者： qi Gu He zhu Jing Li Xia Li Jie hao Gordon G.Wallace qi Zhou State Key Laboratory of Stem Cell and Reproductive Biology Institute of ZoologyChinese Academy of Sciences ARC Centre of Excellence for Electromaterials Science(ACES) Intelligent Polymer Research InstituteAIIM FacilityInnovation CampusUniversity of Wollongong

Biological materials can actively participate in the formation of bioactive organs and can even control cell fate to form functional tissues that we name as the smart regenerative medicine(SRM). The SRM requires interdisciplinary efforts to finalize the pre-designed organs. Three-dimensional(3D) printing, as an additive manufacturing technology, has been widely used in various fields due to its high resolution and individuation. In SRM, with the assistance of 3D printing, cells and biomaterials could be precisely positioned to construct complicated tissues. This review summarizes the state of the SRM advances and focuses in particular on the 3D printing application in biofabrication. We further discuss the issues of SRM development and finally propose some approaches for future 3D printing, which involves SRM.

关键词： 3D bioprinting regenerative medicine biomaterials tissues

The heterogeneous influence of economic growth on environmental pollution: evidence from municipal data of China

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Petroleum Science 2020年第4期17卷 1180-1193页

作者： Zhen Huangfu Hui Hu Nan Xie Yu-qi zhu hao Chen Yang Wang School of Economics and Management Tsinghua UniversityBeijing 100084China Economic Development Research Centre Wuhan UniversityWuhan 430070HubeiChina School of Economics and Management Wuhan UniversityWuhan 430070HubeiChina Antai College of Economics and Management Shanghai Jiao Tong UniversityShanghai 200240China

This study aims to investigate the influence of rapid economic development on pollution at the municipal level in *** constructs a Stochastic Impacts by Regression on Population,Affluence and Technology model(STIRPAT model) and uses comprehensive municipal data on industrial pollution and economic *** dataset contains 290 cities from2003 to 2016 as a sample for the panel data *** study further separates the cities into two groups by their levels of economic development for heterogeneity *** reveals that a low level of economic development would aggravate environmental pollution,and when the economy reaches a high level,this economic development will improve environmental *** also find that the relationships between foreign direct investment and industrial dust and sulfur dioxide(SO_2) discharge are significant,while the relationship between economic growth and effluent emission is *** more developed subsample cities present an inverted U-shaped curve between industrial pollutant emission,GDP per capita,and foreign direct investment,while the less developed subsamples show no such *** the shape of these curves differs among regions,their turning points vary *** on this finding,this study suggests that the governments of more developed cities should balance environmental pollution and economic development by enhancing environmental regulations and adjusting industrial structure.

关键词： Environmental pollution Economic development China Municipal data STIRPAT model Heterogeneity

Discrepancies in boreal summer monsoon rainfall between GPCP and CMAP products during 1979–2014

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Atmospheric and Oceanic Science Letters 2016年第3期9卷 226-233页

作者： hao Yu-qian zhu Cong-Wen LIU Bo-qi Institute of Climate System Chinese Academy of Meteorological Sciences State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences

This study compares the boreal summer monsoon （BSM） precipitation between the GPCP and CMAP products during 1979-2014. The authors apply temporal, spatial correlation and error evaluation methods to evaluate their discrepancies in terms of BSM distribution and summer rainfall interannual variability over the five BSM regions. The results suggest that the climatology of the seasonal evolution of BSM rainfall is reflected well in both datasets, and the summer rainfall anomalies of the two products are highly correlated. However, major diversity is found in the rainfall pattern and the magnitude in climatology over the oceanic monsoon areas, especially the western North Pacific monsoon region, as well as in the interannual variability of summer rainfall anomalies over the North Africa and India monsoon regions. Although inconsistency between the two datasets is evident before the 1990s, the use of their arithmetic mean is demonstrated to be an efficient way to reduce the uncertainty between them.

关键词： GPCP CMAP boreal summermonsoonl interannualvariability data evaluation

Digital Watermarking Secure Scheme for Remote Sensing Image Protection

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China Communications 2020年第4期17卷 88-98页

作者： Guanghui Yuan qi hao Space star technology co. LTDBeijing 100086China

As a means of copyright protection for multimedia data, digital watermarking technology has attracted more and more attention in various research fields. Researchers have begun to explore the feasibility of applying it to remote sensing data recently. Because of the particularity of remote sensing image, higher requirements are put forward for its security and management, especially for the copyright protection, illegal use and authenticity identification of remote sensing image data. Therefore, this paper proposes to use image watermarking technology to achieve comprehensive security protection of remote sensing image data, while the use of cryptography technology increases the applicability and security of watermarking technology. The experimental results show that the scheme of remote sensing image digital watermarking technology has good performance in the imperceptibility and robustness of watermarking.

关键词： data security watermark remote sensing image protection

Multi-radio access based bandwidth allocation strategy for video communication in heterogeneous wireless networks

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The Journal of China Universities of Posts and Telecommunications 2016年第2期23卷 6-14页

作者： zhu Xuewen zhu qi Jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and Telecommunications Key Laboratory on Wideband Wireless Communications and Sensor Network Technology Nanjing University of Posts and Telecommunications

In order to make full use of the radio resource of heterogeneous wireless networks（HWNs） and promote the quality of service（Qo S） of multi-homing users for video communication, a bandwidth allocation algorithm based on multi-radio access is proposed in this paper. The proposed algorithm adopts an improved distributed common radio resource management（DCRRM） model which can reduce the signaling overhead sufficiently. This scheme can be divided into two phases. In the first phase, candidate network set of each user is obtained according to the received signal strength（RSS）. And the simple additive weighted（SAW） method is employed to determine the active network set. In the second phase, the utility optimization problem is formulated by linear combining of the video communication satisfaction model, cost model and energy efficiency model. And finding the optimal bandwidth allocation scheme with Lagrange multiplier method and Karush-Kuhn-Tucker（KKT） conditions. Simulation results show that the proposed algorithm promotes the network load performances and guarantees that users obtain the best joint utility under current situation.

关键词： video communication heterogeneous wireless networks joint utility energy efficiency radio resource management

LightGCNet:基于轻量化卷积网络的深度色域压缩算法

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计算机科学与探索 2025年第1期19卷 196-210页

作者：杨晨徐昊朱佳伟吴秦柴志雷江南大学人工智能与计算机学院江苏无锡214122 江苏省模式识别与计算智能工程实验室江苏无锡214122

色域压缩是大色域向小色域进行转换时保持色彩信息的关键技术。经典算法虽计算快速,但处理结果缺乏细节且没有考虑人眼的感知特性,难以满足人们对色彩品质不断提升的要求。迭代算法处理效果更佳,但极其耗时,无法投入实际应用。针对上述... 详细信息

色域压缩是大色域向小色域进行转换时保持色彩信息的关键技术。经典算法虽计算快速,但处理结果缺乏细节且没有考虑人眼的感知特性,难以满足人们对色彩品质不断提升的要求。迭代算法处理效果更佳,但极其耗时,无法投入实际应用。针对上述问题,提出了轻量化的深度色域压缩方法,该方法可在逼近迭代算法计算效果的同时保持接近经典算法的速度。为色域压缩算法设计了LightGCNet模型,该网络中的双层卷积由DSC与DW卷积组合而成,相比常规U-Net,参数量与计算复杂度急剧降低。为进一步提高模型先验性,将预训练得到的DW卷积中多个核通道进行重聚焦操作以建立联系,最终权重由重聚焦权重和预训练权重组成。针对色相、明度、彩度这三个色彩属性,设计了色域压缩专用的损失函数。该函数不仅考虑了像素级损失,而且融合了图像感知损失,并联合色彩属性的多尺度信息进行加权,解决了深度色域压缩过程中细节丢失的问题。基于迭代算法生成标签以训练网络,联合学习目标色域特征与图像信息,实现了与迭代算法相当的效果。实验结果表明:该方法与业界经典的SGCK算法相比,iCID值降低了17.08%,SSIM值提高了5.30%。相比常规U-Net模型,LightGCNet参数量减少了82.96%,乘加次数从8.5GFLOPs大幅下降至2.2GFLOPs,使改良模型更适于低端设备部署。该模型在CPU上处理单幅512×512图像仅需0.208s,计算时间比迭代类算法减少99.92%。

关键词：色域压缩轻量化深度学习色彩管理

A new hierarchical software architecture towards safety-critical aspects of a drone system

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Frontiers of Information Technology & Electronic Engineering 2019年第3期20卷 353-362页

作者： Xiao-rui zhu Chen LIANG Zhen-guo YIN Zhong Shao Meng-qi LIU hao CHEN Department of Mechanical Engineering and Automation Harbin Institute of Technology (Shenzhen) Department of Computer Science Yale University

A new hierarchical software architecture is proposed to improve the safety and reliability of a safetycritical drone system from the perspective of its source code. The proposed architecture uses formal verification methods to ensure that the implementation of each module satisfies its expected design specification, so that it prevents a drone from crashing due to unexpected software failures. This study builds on top of a formally verified operating system kernel, certified kit operating system(CertiKOS). Since device drivers are considered the most important parts affecting the safety of the drone system, we focus mainly on verifying bus drivers such as the serial peripheral interface and the inter-integrated circuit drivers in a drone system using a rigorous formal verification method. Experiments have been carried out to demonstrate the improvement in reliability in case of device anomalies.

关键词： Safety-critical Drone Software architecture Formal verification