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Effects of ultrasonication on the DBP formation and toxicity during chlorination of saline wastewater effluents

Journal of Environmental Sciences 2022年第7期34卷 326-335页

作者： Yu li wanxin li Xiangru Zhang Jingyi Jiang School of Environment Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety&MOE Key Laboratory of Theoretical Chemistry of EnvironmentSouth China Normal UniversityGuangzhou 510006China Department of Civil and Environmental Engineering Hong Kong University of Science and TechnologyHong KongChina

Chlorine disinfection of saline wastewater effluents rich in bromide and iodide forms relatively toxic brominated and iodinated disinfection byproducts(DBPs). Ultrasonication is a relatively new water treatment technology, and it is less sensitive to suspended solids in wastewaters. In this study, we examined the effects of ultrasonication(in terms of reactor type and combination mode with chlorination) on the DBP formation and toxicity in chlorinated primary and secondary saline wastewater effluents. Compared with the chlorinated wastewater effluent samples without ultrasonication, ultrasonic horn pretreatment of the wastewater effluent samples reduced the total organic halogen(TOX) levels in chlorination by ~30%, but ultrasonic bath pretreatment of the wastewater samples did not significantly change the TOX levels in chlorination, which might be attributed to the higher energy utilization and decomposition extent of organic DBP precursors in the ultrasonic horn reactor. Moreover, the TOX levels in the chlorinated samples with ultrasonic horn pretreatment(USH–chlorination), simultaneous treatment(chlorination + USH) and subsequent treatment(chlorination–USH) were also significantly reduced, with the maximum TOX reductions occurring in the samples with ultrasonic horn pretreatment. A toxicity index was calculated by weighting and summing the levels of total organic chlorine, total organic bromine and total organic iodine in each treated sample. The calculated toxicity index values of the chlorinated wastewater effluent samples followed a descending rank order of “chlorination” > “chlorination + USH” > “chlorination–USH” > “USH–chlorination”, with the lowest toxicity occurring in the samples with ultrasonic horn pretreatment. Then, a developmental toxicity bioassay was conducted for each treated sample. The measured toxicity index values of the chlorinated wastewater samples followed the same descending rank order.

关键词： Disinfection byproducts DBPs Chlorination Ultrasonication Developmental toxicity

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Examining the Influence of Fertility Policy Adjustments on Gender Equality in China During the Period of Exceptionally Slow Population Growth

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China CDC weekly 2023年第27期5卷 605-608页

作者： Xueyan Yang wanxin li Rui li Institute for Population and Development Studies School of Public Policy and AdministrationXi'an Jiaotong UniversityXi'an CityShaanxi ProvinceChina

The Chinese population is entering a new stage of development,marked by the fertility intentions of women of childbearing age continuing to decline and concerns over their consistently low fertility *** number of newborns has been decreasing annually,with 2022 figures falling below 10 million for the first time since the founding of the People’s Republic of China,resulting in negative population growth(1).Currently,China’s population over the age of 60 years is nearing 300 million and is projected to surpass 20%of the total population during the 14th Five-Year Plan period.

关键词： Population fertility annually

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Fabrication and Mechanical Testing of Ultralight Folded Lattice-CoreSandwich Cylinders

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Engineering 2020年第2期6卷 196-204页

作者： wanxin li Qing Zheng Hualin Fan Bin Ji State Key Laboratory for Disaster Prevention and Mitigation of Explosion and Impact Army Engineering University of PLANanjing 210007China Research Center of lightweight Structures and Intelligent Manufacturing State Key Laboratory of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics and AstronauticsNanjing 210016China Aerospace System Engineering Shanghai Shanghai 2011089China

In this research,two novel folded lattice-core sandwich cylinders were designed,manufactured,and *** lattice core has periodic zigzag corrugations,whose ridges and valleys are directed axially or *** vibration and axial compression experiments were performed to reveal the fundamental frequency,free vibration modes,bearing capacity,and failure mode of the cylinder.A folded lattice core effectively restricts local buckling by reducing the dimension of the local skin periodic cell,and improves the global buckling resistance by enhancing the shear stiffness of the sandwich *** cylinders fail at the mode of material failure and possess excellent load-carrying *** axially directed folded sandwich cylinder has greater load-carrying capacity,while a circumferentially directed folded sandwich cylinder has higher fundamental *** two types of folded lattices provide a selection for engineers when designing a sandwich cylinder requiring strength or *** research also presents a feasible way to fabricate a large-dimensional folded structure and promote its engineering application.

关键词： Folded lattice-core sandwich cylinder Fabrication Mechanical testing

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Inflammation as a Mediator of Microbiome Dysbiosis-Associated DNA Methylation Changes in Gastric Premalignant Lesions

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Phenomics 2023年第5期3卷 496-501页

作者： lingjun Yan wanxin li Fenglin Chen Junzhuo Wang Jianshun Chen Ying Chen Weimin Ye Department of Epidemiology and Health Statistics School of Public HealthFujian Medical UniversityFuzhou 350122China Key Laboratory of Ministry of Education for Gastrointestinal Cancer Fujian Medical UniversityFuzhou 350122China Department of Gastroenterology Fujian Medical University Union HospitalFuzhou 350001China Changle Center for Disease Prevention and Control Fuzhou 350200China Changle Institute for Cancer Research Fuzhou 350200China Department of Medical Epidemiology and Biostatistics Karolinska InstitutetStockholm 17177Sweden

Evidence for the influence of chronic inflammation induced by microbial dysbiosis on aberrant DNA methylation supports a plausible connexion between disordered microbiota and precancerous lesions of gastric cancer(PLGC).Here,a comprehensive study including multi-omics data was performed to estimate the relationships amongst the gastric microbiome,inflammatory proteins and DNA methylation alterations and their roles in PLGC *** results demonstrated that gastric dysbacteriosis increased the risk of PLGC and DNA methylation alterations in related tumour suppressor *** inflammatory biomarkers were identified for antrum and corpus tissues,respectively,amongst which the expression levels of several biomarkers were significantly correlated with the microbial dysbiosis index(MDI)and methylation status of specific tumour suppressor ***,mediation analysis revealed that microbial dysbiosis partially contributed to DNA methylation changes in the stomach via the inflammatory cytokines C-C motif chemokine 20(CCL20)and tumour necrosis factor receptor superfamily member 9(TNFRSF9).Overall,these results may provide new insights into the mechanisms that might link the gastric microbiome to PLGC.

关键词： Gastric premalignant lesions Microbiome dysbiosis Inflammation DNA methylation Mediation analysis

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高速动车组电空制动系统的建模和参数分析

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中国铁道科学 2017年第2期38卷 89-95页

作者：李万新中国铁道科学研究院机车车辆研究所北京100081 北京纵横机电技术开发公司北京100094

高速动车组电空制动系统是由气动元件、电子元件和基础制动装置组成的复杂系统。基于现代流体力学的仿真分析软件AMESim建立制动系统中关键气动元件的仿真模型,通过试验数据对仿真模型进行验证和参数修正;将封装的气动元件模型与电子元... 详细信息

高速动车组电空制动系统是由气动元件、电子元件和基础制动装置组成的复杂系统。基于现代流体力学的仿真分析软件AMESim建立制动系统中关键气动元件的仿真模型,通过试验数据对仿真模型进行验证和参数修正;将封装的气动元件模型与电子元件模型和基础制动装置进行系统集成,建立单车以及列车级电空制动系统仿真模型。基于列车级电空制动系统仿真模型,对高速动车组电空制动系统参数进行配置和分析,设计高速动车组电空制动系统。在最大常用制动和紧急制动2种工况下对基于仿真模型设计的高速动车组电空制动系统进行验证。结果表明:最大常用制动时减速度仿真值与减速度设计值相符;紧急制动时制动距离试验值为5 670m,仿真计算值为5 795m,相对误差为2.2%,仿真计算值与试验值吻合程度高。

关键词：高速动车组电空制动系统气动元件参数分析系统集成仿真技术

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Population dynamics in northwestern China

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China Population and Development Studies 2021年第4期5卷 107-123页

作者： Xueyan Yang wanxin li Wen Jing Chezhuo Gao Rui li Yuqi He Institute for Population and Development Studies School of Public Policy and AdministrationXi’an Jiaotong UniversityXi’anChina

This article analyzes the population dynamics in northwestern China from roughly 2010 to *** area’s dynamics showed a slow,stable increase in population size,a stable increase in the population of non-Han ethnic groups,which increased at a more rapidly than the Han population,and population rejuvenation coupled with a population structure that *** biological sex structure fluctuated within a balanced range in northwestern *** advanced in northwestern China,throughout this period,but the area’s level of urbanization is still significantly lower than the average level of urbanization nationally.

关键词： Fertility Ethnic structure Age structure Urbanization Northwestern China

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UV-Based Advanced Oxidation Processes for Antibiotic Resistance Control: Efficiency, Influencing Factors, and Energy Consumption

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Engineering 2024年第6期37卷 27-39页

作者： Jiarui Han wanxin li Yun Yang Xuanwei Zhang Siyu Bao Xiangru Zhang Tong Zhang Kenneth Mei Yee Leung Department of Civil and Environment Engineering The Hong Kong University of Science and TechnologyHong Kong 999077China Department of Civil Engineering The University of Hong KongHong Kong 999077China State Key Laboratory of Marine Pollution and Department of Chemistry City University of Hong KongHong Kong 999077China

Antibiotic resistant bacteria(ARB)with antibiotic resistance genes(ARGs)can reduce or eliminate the effectiveness of antibiotics and thus threaten human *** United Nations Environment Programme considers antibiotic resistance the first of six emerging issues of *** oxidation processes(AOPs)that combine ultraviolet(UV)irradiation and chemical oxidation(primarily chlorine,hydrogen peroxide,and persulfate)have attracted increasing interest as advanced water and wastewater treatment *** integrated technologies have been reported to significantly elevate the efficiencies of ARB inactivation and ARG degradation compared with direct UV irradiation or chemical oxidation alone due to the generation of multiple reactive *** this study,the performance and underlying mechanisms of UV/chlorine,UV/hydrogen peroxide,and UV/persulfate processes for controlling ARB and ARGs were reviewed based on recent *** affecting the process-specific efficiency in controlling ARB and ARGs were discussed,including biotic factors,oxidant dose,UV fluence,pH,and water matrix *** addition,the cost-effectiveness of the UV-based AOPs was evaluated using the concept of electrical energy per *** UV/chlorine process exhibited a higher efficiency with lower energy consumption than other UV-based AOPs in the wastewater matrix,indicating its potential for ARB inactivation and ARG degradation in wastewater *** studies are required to address the trade-off between toxic byproduct formation and the energy efficiency of the UV/chlorine process in real wastewater to facilitate its optimization and application in the control of ARB and ARGs.

关键词： Advanced oxidation processes Ultraviolet/chlorine Ultraviolet/hydrogen peroxide Ultraviolet/persulfate Antibiotic resistant bacteria Antibiotic resistance genes

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On-chip ultra-high rejection and narrow bandwidth filter based on coherency-broken cascaded cladding-modulated gratings

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Photonics Research 2024年第5期12卷 979-985页

作者： JINZHAO WANG TING li YANG FENG JIEWEN li wanxin li LUWEI DING YONG YAO JIANAN DUAN WEI liU FENG HE YI ZOU XIAOCHUAN XU Guangdong Provincial Key Laboratory of Integrated Photonic-Electronic Chip Guangdong Provincial Key Laboratory of Aerospace Communication and Networking TechnologyHarbin Institute of TechnologyShenzhenShenzhen 518055China School of Information Science and Technology ShanghaiTech UniversityShanghai 201210China

Bragg filters are of essential importance for chip-scale photonic ***,the implementation of filters with sub-nanometer bandwidth and rejection beyond 70 dB is hindered by the high index contrast of the siliconon-insulator platform,which makes filters prone to fabrication *** this paper,we propose to combine coherency-broken cascading architecture and cladding modulation to circumvent the intrinsic *** cascading architecture effectively prevents the accumulation of phase errors,while the cladding modulation offers additional design freedom to reduce the coupling coefficient.A bimodal Bragg filter with a testingequipment-limited rejection level of 74 dB and a 40 dB bandwidth of 0.44 nm is experimentally *** minimum feature size is 90 nm,which significantly relieves the fabrication constraints.

关键词： filter cladding narrow

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