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兰州城市绿地SCCPs污染来源及人群健康风险

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中国环境科学 2024年第3期44卷 1697-1705页

作者：贾柠屹程景隆胡柏丞郭雨轩宋世杰赵渊毛潇萱兰州大学资源环境学院甘肃省环境污染预警与控制重点实验室甘肃兰州730000

观测了2022~2023年暖、冷季节兰州市主城区绿化用地土壤中短链氯化石蜡(SCCPs)的污染水平、组成特征,并利用主成分分析法、多元线性回归方法对其污染来源进行了解析,运用熵值法进行生态风险评估,并利用暴露评估模型对人群健康暴露风险... 详细信息

观测了2022~2023年暖、冷季节兰州市主城区绿化用地土壤中短链氯化石蜡(SCCPs)的污染水平、组成特征,并利用主成分分析法、多元线性回归方法对其污染来源进行了解析,运用熵值法进行生态风险评估,并利用暴露评估模型对人群健康暴露风险进行评价.结果表明研究区SCCPs浓度暖季节为19.67~938.15ng/g(平均296.00ng/g),冷季节为61.11~976.20ng/g(平均316.72ng/g),二者对应的氯含量分别为61.49%~64.62%和61.79%~64.21%.碳同系物以C10(35.80%和40.15%)、C11(24.80%和22.52%)为主,氯同系物以Cl7(30.08%和30.00%)、Cl_(8)(23.89%和24.44%)为主.来源解析显示污染可能来源于工业活动、污水处理厂废水和污泥的排放以及废水灌溉.生态风险评价表明土壤中的SCCPs不会对土壤生态造成重大危害,健康风险评价显示不论是儿童还是成人土壤SCCPs的暴露均低于每日可耐受摄入量(TDI).

关键词：短链氯化石蜡城市绿地来源解析健康风险

A Prognostic Model Based on Colony Stimulating Factors-related Genes in Triple-negative Breast Cancer

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生物化学与生物物理进展 2024年第10期51卷 2741-2756页

作者： guo yu-xuan WANG Zhi-yu XIAO Pei-Yao ZHENG Chan-Juan FU Shu-Jun HE Guang-Chun LONG Jun WANG Jie DENG Xi-yun WANG Yi-An Key Laboratory of Model Animals and Stem Cell Biology in Hunan Province School of MedicineHunan Normal UniversityChangsha 410013China Engineering Research Center of Reproduction and Translational Medicine of Hunan Province Changsha 410013China Department of Pathology Institute of Oncology&Diagnostic Pathology CenterThe School of Basic Medical SciencesFujian Medical UniversityFuzhou 350122China Shenzhen Key Laboratory of Energy Electrocatalytic Materials Shenzhen Key Laboratory of Polymer Science and TechnologyGuangdong Provincial Key Laboratory of New Energy Materials Service SafetyCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518055China

Objective Triple-negative breast cancer(TNBC)is the breast cancer subtype with the worst prognosis,and lacks effective therapeutic *** stimulating factors(CSFs)are cytokines that can regulate the production of blood cells and stimulate the growth and development of immune cells,playing an important role in the malignant progression of *** article aims to construct a novel prognostic model based on the expression of colony stimulating factors-related genes(CRGs),and analyze the sensitivity of TNBC patients to immunotherapy and drug *** We downloaded CRGs from public databases and screened for differentially expressed CRGs between normal and TNBC tissues in the TCGA-BRCA *** LASSO Cox regression analysis,we constructed a prognostic model and stratified TNBC patients into high-risk and low-risk groups based on the colony stimulating factors-related genes risk score(CRRS).We further analyzed the correlation between CRRS and patient prognosis,clinical features,tumor microenvironment(TME)in both high-risk and low-risk groups,and evaluated the relationship between CRRS and sensitivity to immunotherapy and drug *** We identified 842 differentially expressed CRGs in breast cancer tissues of TNBC patients and selected 13 CRGs for constructing the prognostic ***-Meier survival curves,time-dependent receiver operating characteristic curves,and other analyses confirmed that TNBC patients with high CRRS had shorter overall survival,and the predictive ability of CRRS prognostic model was further validated using the GEO *** combining clinical features confirmed that CRRS was an independent factor for the prognosis of TNBC ***,patients in the high-risk group had lower levels of immune infiltration in the TME and were sensitive to chemotherapeutic drugs such as 5-fluorouracil,ipatasertib,and *** We have developed a CRRS-based prognostic model composed of 13 differentially expre

关键词： triple-negative breast cancer colony stimulating factors prognostic model tumor microenvironment drug sensitivity

黄河上游兰州段SCCPs污染特征及来源解析

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中国环境科学 2024年第5期44卷 2526-2533页

作者：程景隆贾柠屹胡柏丞郭雨轩宋世杰赵渊毛潇萱兰州大学资源环境学院甘肃省环境污染预警与控制重点实验室甘肃兰州730000

对黄河上游兰州段2023年枯水期和丰水期水环境中短链氯化石蜡(SCCPs)的污染特征、来源和生态风险展开调查.研究区水相、悬浮颗粒相和沉积物中SCCPs浓度水平分别为116.04~1057.74ng/L、1.89~68.93μg/g(干重)和121.65~428.97ng/g(干重).... 详细信息

对黄河上游兰州段2023年枯水期和丰水期水环境中短链氯化石蜡(SCCPs)的污染特征、来源和生态风险展开调查.研究区水相、悬浮颗粒相和沉积物中SCCPs浓度水平分别为116.04~1057.74ng/L、1.89~68.93μg/g(干重)和121.65~428.97ng/g(干重).水相中SCCPs浓度丰水期高于枯水期,而悬浮颗粒相中SCCPs浓度枯水期则要高于丰水期,沉积物中SCCPs浓度在主要排污口下游以及河流较缓处枯水期高于丰水期,研究区可能存在丰水期排污量增加的情况;SCCPs同系物以C_(10)、C_(11)组分和Cl_(5-7)组分占比最高.研究区SCCPs污染可能主要源于CPs产品的生产和使用以及大气迁移传输,其污染贡献率分别为67.21%和32.79%.根据加拿大环境部的风险判定标准,研究区河水和沉积物中SCCPs污染暂未构成显著的生态风险,但悬浮颗粒相中SCCPs较高的浓度需得到应有的重视.

关键词：黄河短链氯化石蜡来源解析生态风险

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基于FLUENT的燃气发生器热流特性研究

火工品 2024年第1期 7-12页

作者：施伟王伟郭宇轩李思宇李晨铭张丽莎王端中北大学环境与安全工程学院山西太原030051 南京理工大学江苏南京210094 西北工业大学陕西西安710072

为研究燃气发生器作用过程内部温度分布及滤网降温作用原理,基于Ansys Fluent软件对4种不同结构燃气发生器内部气体温度分布情况进行仿真分析,选用Standard k-ε模型模拟气体流动,以多孔介质模型模拟滤网,得到4组仿真结果。结果表明:侧... 详细信息

为研究燃气发生器作用过程内部温度分布及滤网降温作用原理,基于Ansys Fluent软件对4种不同结构燃气发生器内部气体温度分布情况进行仿真分析,选用Standard k-ε模型模拟气体流动,以多孔介质模型模拟滤网,得到4组仿真结果。结果表明:侧排式结构能延长气体流动路径,增加气体与内壁热交换;滤网可通过热交换降低气体温度,同时阻碍传质、延长气体与内壁接触时间,从而实现在限定时间内延缓出口温度上升。本研究为进一步优化燃气发生器降温结构设计提供参考。

关键词：燃气发生器传热分析多孔介质模型湍流有限体积法

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高海拔公路隧道火灾特性及安全疏散时间研究

公路 2024年第5期69卷 261-271页

作者：郭煜轩倪杨钦李宇翔李强方青青韩常领王安民严涛西南交通大学土木工程学院成都市610031 西南交通大学交通隧道工程教育部重点实验室成都市610031 江苏百盛工程咨询有限公司南京市210000 中交第一公路勘察设计研究院西安市710068 云南省交通规划设计研究院昆明市650011

为探明高海拔公路隧道火灾烟气及温度扩散规律,得到高海拔条件下人员安全疏散时间,采用理论分析、现场试验、数值模拟等手段,取得如下成果:高原环境大气密度及空气含氧量随着海拔的升高下降明显;高海拔地区相较于平原地区火灾燃烧的热... 详细信息

为探明高海拔公路隧道火灾烟气及温度扩散规律,得到高海拔条件下人员安全疏散时间,采用理论分析、现场试验、数值模拟等手段,取得如下成果:高原环境大气密度及空气含氧量随着海拔的升高下降明显;高海拔地区相较于平原地区火灾燃烧的热释放速率低143%,燃烧时间延长186 s;燃烧稳定后,高海拔隧道火灾最大纵向烟雾扩散速度比平原隧道大12.1%,最大横向烟雾扩散速度比平原隧道大12.5%,相同火灾规模情况下高海拔隧道最高纵向温度比平原隧道高16.5%,最高横向温度比平原隧道高5.7%,高海拔隧道整体温度要高于平原隧道;在30 MW火灾规模下,人员可用安全疏散时间与距火源点距离成正比,当距离火源点300 m处人员可用安全疏散时间达到506 s。研究成果可用于指导羊八井隧道人员安全疏散,同时也可为类似工程防灾救援提供参考借鉴。

关键词：隧道工程高海拔隧道火灾工况烟雾扩散特性温度分布规律可用安全疏散时间

烟秆炭基肥对植烟土壤氮组分及微生物群落结构的影响

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南方农业学报 2024年第4期55卷 932-941页

作者：刘东明郭宇轩童晨晓魏圆慧杨曦毛艳玲福建农林大学资源与环境学院福建福州350002 土壤生态系统健康与调控福建省高校重点实验室福建福州350002 自然生物资源保育利用福建省高校工程研究中心福建福州350002

【目的】研究不同用量烟秆炭基肥对植烟土壤氮组分及微生物群落结构的影响,以期为烟秆炭基肥在农业生产中的应用及植烟土壤氮素固持提供科学依据。【方法】采用田间试验,设对照(CK,不施肥)、烟草专用肥(F,750 kg/ha)、低量烟秆炭基肥(LB... 详细信息

【目的】研究不同用量烟秆炭基肥对植烟土壤氮组分及微生物群落结构的影响,以期为烟秆炭基肥在农业生产中的应用及植烟土壤氮素固持提供科学依据。【方法】采用田间试验,设对照(CK,不施肥)、烟草专用肥(F,750 kg/ha)、低量烟秆炭基肥(LBF,525 kg/ha)、中量烟秆炭基肥(MBF,1050 kg/ha)和高量烟秆炭基肥(HBF,1575kg/ha)共5个处理,其中MBF与F处理的氮(N)、磷(P)、钾(K)养分含量相同。烟叶成熟期采集表层土壤样品测定土壤氮含量、酶活性及微生物相关指标,分析不同用量烟秆炭基肥处理对土壤有机氮和无机氮含量、土壤氮循环酶活性及微生物群落结构的影响。【结果】与CK相比,施用烟秆炭基肥显著提高了土壤的全氮、可溶性有机氮、颗粒有机氮及铵态氮含量(PMBF>LBF>F>CK,LBF、MBF和HBF处理的微生物量氮含量较F处理分别提高31.83%、44.32%和59.84%。施用烟秆炭基肥增加了土壤细菌群落丰富度和多样性,且与施用量有关,其中HBF处理的Chao1指数和Shannon指数最高,较CK分别显著提高4.38%和5.92%,较F处理分别显著提高2.68%和3.46%。施用烟秆炭基肥也影响了细菌群落组成,与CK相比,LBF、MBF和HBF处理的变形菌门(Proteobacteria)相对丰度降低11.14%~15.16%,放线菌门(Actinobacteria)相对丰度提高6.50%~10.89%,根微菌属(Rhizomicrobium)相对丰度提高177.00%~203.00%。冗余分析结果表明,土壤全氮、可溶性有机氮、颗粒有机氮和铵态氮含量及脲酶和过氧化氢酶活性与放线菌门、单糖菌门(Saccharibacteria)、厚壁菌门(Firmicutes)呈正相关,与变形菌门、绿弯菌门(Chloroflexi)、硝化螺旋菌门(Nitrospirae)呈负相关。【结论】施用烟秆炭基肥可提高土壤氮组分含量,调节细菌群落结构,以中、高量烟秆炭基肥处理效果较优。同等肥力下,施用烟秆炭基肥的效果优于烟草专用肥。在实际生产中考虑到生产成本及施用效果,以中量烟秆炭基肥处理(1050 kg/ha)较适合。

关键词：烟秆炭基肥氮组分酶活性微生物群落结构

维普期刊数据库博看期刊

Escape probability for isotropic emitters near Kerr black hole with astrometric

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Communications in Theoretical Physics 2024年第5期76卷 128-133页

作者： yu-xuan Han Qing-Hua Zhu Qing-guo Huang CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesNo.19A Yuquan RoadBeijing 100049China Department of Physics Chongqing UniversityChongqing 401331China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced Study UCASHangzhou 310024China

The paper investigates the escape probability for isotropic emitters near a Kerr black *** propose a new approach to obtain the escape probability in a general manner,going beyond previous case-by-case *** approach is based on studies of the black hole shadow with astrometric observable and can be applied to emitters with an arbitrary 4-velocities and locations,even to the emitters outside of the equatorial *** also consider representative examples illustrating how escape probabilities vary with distance,velocity,and inclination ***,this new approach provides an effective method for studying escape probabilities near Kerr black holes.

关键词： Kerr black hole photon escape probability isotropic emitters

Revealing the role of calcium ion intercalation of hydrated vanadium oxides for aqueous zinc-ion batteries

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Journal of Energy Chemistry 2024年第8期95卷 9-19,I0001页

作者： Tao Zhou xuan Du guo Gao Key Laboratory for Thin Film and Micro Fabrication of the Ministry of Education School of Sensing Science and EngineeringSchool of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Exploring suitable high-capacity V_(2)O_(5)-based cathode materials is essential for the rapid advancement of aqueous zinc ion batteries(ZIBs).However,the typical problem of slow Zn^(2+)diffusion kinetics has severely limited the feasibility of such *** this work,unique hydrated vanadates(CaVO,BaVO)were obtained by intercalation of Ca^(2+)or Ba^(2+)into hydrated vanadium *** the CaVO//Zn and BaVO//Zn batteries systems,the former delivered up to a 489.8 mAh g^(-1)discharge specific capacity at 0.1 A g^(-1).Moreover,the remarkable energy density of 370.07 Wh kg^(-1)and favorable cycling stability yard outperform BaVO,pure V_(2)O_(5),and many reported cathodes of similar ionic intercalation *** addition,pseudocapacitance analysis,galvanostatic intermittent titration(GITT)tests,and Trasatti analysis revealed the high capacitance contribution and Zn^(2+)diffusion coefficient of CaVO,while an in-depth investigation based on EIS elucidated the reasons for the better electrochemical performance of ***,ex-situ XRD,XPS,and TEM tests further demonstrated the Zn^(2+)insertion/extraction and Zn-storage mechanism that occurred during the cycle in the CaVO//Zn battery *** work provides new insights into the intercalation of similar divalent cations in vanadium oxides and offers new solutions for designing cathodes for high-capacity aqueous ZIBs.

关键词： Aqueous zinc ion batteries Cathode materials Ion pre-intercalation Vanadium oxides Energy storage mechanism

Interference of harmonics emitted by different tunneling momentum channels in laser fields

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Chinese Physics B 2024年第9期33卷 366-372页

作者： Ling-yu Zhang Zhuo-xuan Xie Can Wang Xin-Lei Ge Jing guo Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China College of Physical Science and Technology Bohai UniversityJinzhou 121013China

By numerically solving the semiconductor Bloch equation(SBEs),we theoretically study the high-harmonic generation of ZnO crystals driven by one-color and two-color intense laser *** results show the enhancement of harmonics and the cut-off remains the same in the two-color field,which can be explained by the recollision trajectories and electron excitation from *** on the quantum path analysis,we investigate contribution of different ranges of the crystal momentum k of ZnO to the harmonic yield,and find that in two-color laser fields,the intensity of the harmonic yield of different ranges from the crystal momentum makes a big difference and the harmonic intensity is depressed from all k channels,which is related to the interferences between harmonics from symmetric k channels.

关键词： high-order harmonic generation the semiconductor Bloch equation k-resolved inter-band harmonic