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Acetylacetone effectively controlled the secondary metabolites of Microcystis aeruginosa under simulated sunlight irradiation

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Journal of Environmental Sciences 2024年第1期135卷 285-295页

作者： Xiaomeng Wang Yixin luo Shujuan Zhang Lixiang Zhou Department of Environmental Engineering College of Resources and Environmental SciencesNanjing Agricultural UniversityNanjing 210095China The State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China

Inactivation of cyanobacterial cells and simultaneous control of secondary metabolites is of significant necessity for the treatment of cyanobacteria-laden ***(AcAc)has been reported a specific algicide to inactivate Microcystis aeruginosa(***)and an effective light activator to degrade *** study systematically investigated the photodegradation ability of AcAc under xenon(Xe)irradiation on the secondary metabolites of ***,mainly algal organic matter(AOM),especially toxic microcystin-LR(MC-LR).Results showed that AcAc outperformed H_(2)O_(2)in destructing the protein-like substances,humic acid-like matters,aromatic proteins and fulvic-like substances of *** MC-LR(250μg/L),0.05 mmol/L AcAc attained the same degradation efficiency(87.0%)as 0.1mmol/L H_(2)O_(2).The degradation mechanism of Xe/AcAc might involve photo-induced energy/electron transfer and formation of carbon center *** conditions(pH>9.0)were detrimental to the photoactivity of AcAc,corresponding to the observed degradation rate constant(k_(1)value)of MC-LR drastically decreasing to 0.0013 min^(-1)as solution pH exceeded *** PO_(4)^(3-)and HCO_(3)^(-)ions had obvious inhibition effects,whereas NO_(3)^(-)slightly improved k_(1)value from 0.0277 min^(-1)to 0.0321 min^(-1).The presence of AOM did not significantly inhibit MC-LR degradation in Xe/AcAc *** addition,the biological toxicity of MC-LR was greatly reduced after *** results demonstrated that AcAc was an alternative algicidal agent to effectively inactivate algal cells and simultaneously control the secondary metabolites after cell ***,the concentration and irradiation conditions should be further optimized in practical application.

关键词： Microcystis aeruginosa Photodegradation Acetylacetone Secondary metabolites Microcystin

Ultra-low loss Rayleigh scattering enhancement via light recycling in fiber cladding

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Photonics Research 2024年第8期12卷 1813-1819页

作者： PENGTAO luo FENGYI CHEN RUOHUI WANG XUEGUANG QIAO School of Physics Northwest UniversityXi’an 710127China Engineering Research Center of Optical Fiber Well Logging Technology for Oil and Gas Resources Universities of Shaanxi ProvinceXi’an 710127China

Rayleigh backscattering enhancement(RSE)of optical fibers is an effective means to improve the performance of distributed optical fiber *** laser direct-writing techniques have been used to modulate the fiber core for ***,in-core modulation loses more transmission light,thus limiting the sensing *** this work,a cladding-type RSE(cl-RSE)structure is proposed,where the femtosecond laser is focused in the fiber cladding and an array of scatterers is written parallel to the *** refractive-index modulation structure redistributes the light in the cladding,and the backward scattered light is recovered,which enhances the Rayleigh backscattered signal with almost no effect on the core light.

关键词： fiber scattering cladding

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深圳市罗湖区小学生龋病调查及流行特征分析

中国现代医生 2018年第31期56卷 123-125,169页

作者：李旺涛罗鸿城深圳市罗湖区人民医院体检科广东深圳518000 深圳市罗湖区疾病控制中心广东深圳518000

目的调查分析深圳市罗湖区小学生龋病流行状况,为儿童龋病预防提供依据。方法对深圳市罗湖区21个小学进行整群抽样,随机抽取5个小学,对7772例小学生进行龋病检查,通过深圳市学生口腔防治管理系统收集数据,进行统计描述及分析。结果小学... 详细信息

目的调查分析深圳市罗湖区小学生龋病流行状况,为儿童龋病预防提供依据。方法对深圳市罗湖区21个小学进行整群抽样,随机抽取5个小学,对7772例小学生进行龋病检查,通过深圳市学生口腔防治管理系统收集数据,进行统计描述及分析。结果小学生乳牙患龋率44.9%,恒牙患龋率14.2%,乳牙龋均(1.45±0.41),恒牙龋均(0.24±0.07),乳牙填充率12.0%,恒牙填充率24.8%。女生恒牙患龋率(16.5%)高于男生(11.9%)(χ~2=33.051,P<0.01);女生恒牙龋均(0.30±0.08)高于男生(0.19±0.05)(t=-74.069,P<0.01);女生乳牙龋均(1.59±0.48)也高于男生(1.48±0.42),差异均具有统计学意义(t=-10.764,P<0.01)。7～12岁儿童随年龄增长,乳牙患龋率先增长后下降,乳牙龋均呈下降趋势,恒牙患龋率、恒牙龋均呈上升趋势。12岁儿童患龋率27.0%,龋均(0.53±0.17),恒牙填充率为29.7%。结论深圳罗湖区小学生口腔卫生状况较好,龋病流行处于较低水平,龋病治疗状况较好,但各小学学生间差异较大,需要重点加强口腔健康教育及干预措施。

关键词：小学生龋病患龋率龋均

Laser Powder Bed Fusion of Beta-Type Titanium Alloys for Biomedical Application:A Review

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 17-28页

作者： Xuan luo Chao Yang Dongdong Li Lai-Chang Zhang State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan430074China National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic MaterialsSouth China University of TechnologyGuangzhou510640China Centre for Advanced Materials and Manufacturing School of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWA6027Australia

Additive manufacturing ofβ-type titanium alloy is expected to replace Ti-6Al-4V alloy in the field of orthopedic implantation because of their low elastic modulus,excellent corrosion resistance,and *** briefly introducing the laser powder bed fusion(LPBF)process and physical phenomena,this paper reviews the recent progresses in LPBF-edβ-type Ti *** strategies to strengthening and tougheningβ-type Ti alloys are critically *** is followed by the processing routes employed to achieve to low modulus for orthopedic applications,especially a new methodology for tailoring crystallographic orientation called multi-track coupled directional *** effect of processing and compositions on performance metrics ofβ-type Ti alloys included corrosion behavior,and biocompatibility is *** the end,challenges in additive manufacturing ofβ-type Ti alloys in future are highlighted,with the aim to ensue clinical application of LPBF-edβ-type Ti alloys.

关键词： β-type Ti alloys Laser powder bed fusion Mechanical properties Elastic modulus Biocompatibility

Study of the pressure transient behavior of directional wells considering the effect of non-uniform flux distribution

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Petroleum Science 2024年第3期21卷 1765-1779页

作者： Yan-Zhong Liang Bai-Lu Teng Wan-Jing luo School of Energy Resources China University of Geosciences(Beijing)Beijing100083China

During the production,the fluid in the vicinity of the directional well enters the wellbore with different rates,leading to non-uniform flux distribution along the directional ***,in all existing studies,it is oversimplified to a uniform flux distribution,which can result in inaccurate results for field ***,this paper proposes a semi-analytical model of a directional well based on the assumption of non-uniform flux ***,the direction well is discretized into a carefully chosen series of linear sources,such that the complex well trajectory can be captured and the nonuniform flux distribution along the wellbore can be considered to model the three-dimensional flow *** using the finite difference method,we can obtain the numerical solutions of the transient flow within the *** the aid of Green's function method,we can obtain the analytical solutions of the transient flow from the matrix to the *** complete flow behavior of a directional well is perfectly represented by coupling the above two types of transient ***,on the basis of the proposed model,we conduct a comprehensive analysis of the pressure transient behavior of a directional *** computation results show that the flux variation along the direction well has a significant effect on pressure *** addition,the directional well in an infinite reservoir may exhibit the following flow regimes:wellbore afterflow,transition flow,inclined radial flow,elliptical flow,horizontal linear flow,and horizontal radial *** horizontal linear flow can be observed only if the formation thickness is much smaller than the well ***,a dip region that appears on the pressure derivative curve indicates the three-dimensional flow behavior near the wellbore.

关键词： Directional well Pressure transient behavior Semi-analytical model Non-uniform flux

Genetic Variations and Nonalcoholic Fatty Liver Disease:Field Synopsis,Systematic Meta-Analysis,and Epidemiological Evidence

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Biomedical and Environmental Sciences 2024年第7期37卷 762-773页

作者： Yamei Li Xiang Xiao Jie Wang Yixu Liu Xiongfeng Pan Haibin Yu Jiayou luo Miyang luo Department of Epidemiology and Health Statistics School of Public HealthUniversity of South ChinaHengyang 421001HunanChina Department of Maternal and Child Health Xiangya School of Public HealthCentral South UniversityChangsha 410008HunanChina Supervision and Inspection Department of Shanghai Healthcare Security Bureau Shanghai 200003China Department of Epidemiology and Health Statistics Xiangya School of Public HealthCentral South UniversityChangsha 410008HunanChina

Objective To systematically summarize the published literature on the genetic variants associated with nonalcoholic fatty liver disease(NAFLD).Methods Literature from Web of Science,PubMed,and Embase between January 1980 and September 2022 was systematically ***-analyses of the genetic variants were conducted using at least five data *** epidemiologic credibility of the significant associations was graded using the Venice *** Based on literature screening,399 eligible studies were included,comprising 381 candidate gene association,16 genome-wide association,and 2 whole-exome sequencing *** identified 465 genetic variants in 173 genes in candidate gene association studies,and 25 genetic variants in 17 genes were included in the *** meta-analysis identified 11 variants in 10 genes that were significantly associated with NAFLD,with cumulative epidemiological evidence of an association graded as strong for two variants in two genes(HFE,TNF),moderate for four variants in three genes(TM6SF2,GCKR,and ADIPOQ),and weak for five variants in five genes(MBOAT7,PEMT,PNPLA3,LEPR,and MTHFR).Conclusion This study identified six variants in five genes that had moderate to strong evidence of an association with NAFLD,which may help understand the genetic architecture of NAFLD risk.

关键词： Nonalcoholic fatty liver disease Genetic association study Genetic variant Systematic review Meta-analysis

Breaking the optical efficiency limit of virtual reality with a nonreciprocal polarization rotator

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Opto-Electronic Advances 2024年第3期7卷 4-14页

作者： Yuqiang Ding Zhenyi luo Garimagai Borjigin Shin-Tson Wu College of Optics and Photonics University of Central FloridaOrlando FL 32816USA Department of Intelligent Interaction Technologies University of TsukubaTsukubaIbaraki 305-8573Japan Research Fellow of Japan Society for the Promotion of Science Chiyoda-kuTokyo 102-0083Japan

A catadioptric lens structure,also known as pancake lens,has been widely used in virtual reality(VR)displays to reduce the ***,the utilization of a half mirror(HM)to fold the optical path thrice leads to a significant optical *** theoretical maximum optical efficiency is merely 25%.To transcend this optical efficiency constraint while retaining the foldable characteristic inherent to traditional pancake optics,in this paper,we propose a theoretically lossless folded optical system to replace the HM with a nonreciprocal polarization *** our feasibility demonstration experiment,we used a commercial Faraday rotator(FR)and reflective polarizers to replace the lossy *** theoretically predicted 100%efficiency can be achieved approximately by using two high-extinction-ratio reflective *** addition,we evaluated the ghost images using a micro-OLED panel in our imaging ***,the ghost images can be suppressed to undetectable level if the optics are with antireflection *** novel pancake optical system holds great potential for revolutionizing next-generation VR displays with lightweight,compact formfactor,and low power consumption.

关键词： near-eye display virtual reality pancake optics folded optics nonreciprocal polarization rotator

The governance technology for blockchain systems:a survey

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Frontiers of Computer Science 2024年第2期18卷 181-197页

作者： Guocheng ZHU Debiao HE Haoyang AN Min luo Cong PENG School of Cyber Science and Engineering Wuhan UniversityWuhan 430072China Shandong Provincial Key Laboratory of Computer Networks Qilu University of Technology(Shandong Academy of Sciences)Jinan 250014China

After the Ethereum DAO attack in 2016,which resulted in significant economic losses,blockchain governance has become a prominent research ***,there is a lack of comprehensive and systematic literature review on blockchain *** deeply understand the process of blockchain governance and provide guidance for the future design of the blockchain governance model,we provide an in-depth review of blockchain *** this paper,first we introduce the consensus algorithms currently used in blockchain and relate them to governance ***,we present the main content of off-chain governance and investigate two well-known off-chain governance ***,we investigate four common on-chain governance voting techniques,then summarize the seven attributes that the on-chain governance voting process should meet,and finally analyze four well-known on-chain governance blockchain projects based on the previous *** hope this survey will provide an in-depth insight into the potential development direction of blockchain governance and device future research agenda.

关键词： blockchain governance off-chain governance on-chain governance voting

准噶尔盆地陆西地区石南13井区侏罗系三工河组砂体结构及控藏作用

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石油学报 2018年第9期39卷 1006-1018页

作者：刘刚卫延召罗鸿成陈棡龚德瑜王峰孙靖贾开富中国石油勘探开发研究院中国石油新疆油田公司准东采油厂中国石油新疆油田公司勘探开发研究院

准噶尔盆地陆西地区侏罗系三工河组油气成藏条件优越,是非常有利的勘探区带。通过岩心观察、粒度分析和单井相分析等,明确了石南13井区三工河组二段二亚段一砂组(J1s22-1)为多期叠置的三角洲前缘水下分流河道砂体。J1s22-1砂组具有2类... 详细信息

准噶尔盆地陆西地区侏罗系三工河组油气成藏条件优越,是非常有利的勘探区带。通过岩心观察、粒度分析和单井相分析等,明确了石南13井区三工河组二段二亚段一砂组(J1s22-1)为多期叠置的三角洲前缘水下分流河道砂体。J1s22-1砂组具有2类砂体结构单元,分别为水下分流主河道结构单元和水下分流河道侧翼结构单元,前者自底向顶砂岩粒度变粗、单期砂体厚度变大、物性越来越好,后者自底向顶砂岩粒度变细、单期砂体变薄、物性变差。精细油藏解剖和失利井分析表明,水下分流主河道结构单元顶部砂体的储集性能远远好于侧翼结构单元顶部砂体的储集性能,这一因素是控制石南13井区油气藏的关键。基于高精度三维地震资料,综合地震属性研究和单井相分析,刻画了水下分流主河道砂体的发育区,论证并部署了和8预探井。在和8井目的层的试油中获得了产量8.29t/d的工业油流。钻探结果与预测一致证实了地质认识的正确性,揭开了陆西地区三工河组油气勘探的新局面。

关键词：砂体结构控藏作用侏罗系三工河组陆西地区准噶尔盆地