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非离子聚丙烯酰胺絮凝剂对减水剂分散性能的影响

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铁道建筑技术 2024年第8期 1-4页

作者：檀军锋杨雷 Serina ng 李想东宋欣罗鑫陈福现中铁京诚工程检测有限公司北京104442 石家庄市长安育才建材有限公司河北石家庄051430 四川砼道科技有限公司四川成都610200 中铁二十二局集团有限公司北京100043

本文选用非离子聚丙烯酰胺絮凝剂和不同侧链长度、酸醚比的聚羧酸减水剂、萘系减水剂,通过试验研究聚丙烯酰胺与减水剂之间的相互作用及对减水剂分散性能的影响。研究结果:随聚丙烯酰胺含量增加,减水剂的初始分散性能和保持性能均随之下... 详细信息

本文选用非离子聚丙烯酰胺絮凝剂和不同侧链长度、酸醚比的聚羧酸减水剂、萘系减水剂,通过试验研究聚丙烯酰胺与减水剂之间的相互作用及对减水剂分散性能的影响。研究结果:随聚丙烯酰胺含量增加,减水剂的初始分散性能和保持性能均随之下降,而萘系减水剂所受影响较小;随聚羧酸侧链长度增加,聚羧酸减水剂的初始分散性能和保持性能下降严重;随聚羧酸酸醚比增加,各种聚羧酸减水剂的初始分散性能和保持性能受聚丙烯酰胺的影响差距不大;聚羧酸减水剂先吸附于水泥颗粒上,侧链再与聚丙烯酰胺通过氢键相互作用、缠结,从而降低了减水剂的空间位阻效应,随水泥水化更易被水化产物覆盖。

关键词：非离子聚丙烯酰胺絮凝剂减水剂侧链长度酸醚比

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周年生物钟:赋予动物预知季节的能力

Science Bulletin 2024年第12期69卷 1839-1843页

作者：陈君凤吴蔚龙娟刘鑫 David Hazlerigg 詹祥江 Key Laboratory of Animal Ecology and Conservation Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Arctic Seasonal Timekeeping Initiative(ASTI) Department of Arctic and Marine Biology UiTThe Arctic University of NorwayTromsø9037Norway Cardiff University-Institute of Zoology Joint Laboratory for Biocomplexity Research Chinese Academy of SciencesBeijing 100101China Center for Excellence in Animal Evolution and Genetics Chinese Academy of SciencesKunming 650223China

Seasonal changes in climate and animal behaviors have been depicted in Chinese literature since ancient times,such as the classical poem"HuìChóng Ch-un Jiang Wǎn Jǐng"by Su *** now know that the intricate interpla... 详细信息

关键词： periodic behaviors 生物钟

基于人工智能生成内容(AIGC)的网络文学人机协同生产影响动因与生态演替

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昆明理工大学学报（社会科学版） 2024年第3期24卷 142-154页

作者：宋俊锋安仲禹华东师范大学传播学院(出版学院) 上海200241 昆明市网络文学行业团工委云南昆明650500 昆明理工大学艺术与传媒学院云南昆明650500

当人工智能生成内容(AIGC)技术介入网络文学的生产与传播过程,内容生产者如何创作出与生产力和信息化发展相适应的内容文本与作品样态,既是机遇也是挑战。基于UTAUT模型五个核心变量的交叉控制来研究网络文学作者在面对新技术时的个体... 详细信息

当人工智能生成内容(AIGC)技术介入网络文学的生产与传播过程,内容生产者如何创作出与生产力和信息化发展相适应的内容文本与作品样态,既是机遇也是挑战。基于UTAUT模型五个核心变量的交叉控制来研究网络文学作者在面对新技术时的个体使用意愿与行为,同时根据深入访谈后引入“写作焦虑”这一新的预测因子,对网络文学作者使用AI大语言模型的影响因素进行实证研究。结果发现:网络文学作者对技术接入的绩效期望较低;使用技术所需的知识储备和操作难易程度,以及技术使用中所获得的乐趣体验和压力缓解程度成为网络文学作者使用人工智能生成内容(AIGC)技术的主要影响因素;周围群体及社会媒体关于技术的讨论与使用会给网络文学作者带来不同程度的写作焦虑。基于此,网络文学人机协同生产将产生如下生态演替:创作主体从“创作自然人”到“模型伴生人”,再到“独立制作人”;故事内容从“体能码字输出”到“指令引导输出”,再到“算法分析输出”;多模态产品从“数字媒体产品”到“沉浸交互场景”,再到“虚拟全感空间”;创作平台从“契约写作关系”到“行业技术支撑”,再到“产业全链贯通”;政策抓手从“行为引导指令”到“权益细化规约”,再到“流程保障体系”。

关键词：网络文学 AIGC AI大语言模型 UTAUT模型出版生态

Vertical distribution characteristics of soil mercury and its formation mechanism in permafrost regions:A case study of the Qinghai-Tibetan Plateau

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Journal of Environmental Sciences 2022年第3期34卷 311-321页

作者： Yali Liu junfeng Wang Junming Guo Luyang Wang Qingbai Wu State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Bering 200049China State Key Laboratory of Cryospheric Science Northwest Institute of Eco-environment and ResourcesChinese Academy of Sciences(CAS)Lanzhou 730000China

Continuing permafrost degradation is increasing the risk of mercury(Hg) exposure in the permafrost regions on the Qinghai-Tibetan Plateau(QTP),but related studies are still limited,especially the ones on the detailed Hg migration processes in *** vertical distribution characteristics of soil Hg were investigated in three ecosystems in the Beiluhe area on the QTP,and its influencing factors and formation mechanism were *** results indicate that the total soil mercury(THg)concentration in the Beiluhe area remains at an extremely low level(6.33±2.45 ng/g).In the vertical profile,the THg concentration of the shallow soil layer(0-50 cm)(5.96±2.22 ng/g)is significantly lower than that of the deep layer(50-400 cm)(7.44±2.71 ng/g)(png the THg *** weathering results in a low THg concentration in the shallow soil layer because the soil Hg is carried downward with the soil *** a certain depth,the impermeable frozen soil layer intercepts the flow of the soil Hg,and it forms a Hg enrichment *** paper presents the distinctive pattern of the soil Hg distribution in the permafrost regions of the QTP.

关键词： Total soil mercury Qinghai-Tibetan Plateau Alpine ecosystems Permafrost Mercury migration

环孢素A和他克莫司的高效液相色谱-串联质谱检测及其室内质控评价

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医药导报 2024年第2期43卷 196-202页

作者：钟里科米秀芳舒琦许高奇何超能朱俊峰浙江省肿瘤医院药剂科中国科学院杭州医学研究所杭州310022

目的建立环孢素A和他克莫司治疗药物监测的高效液相色谱-串联质谱(HPLC-MS/MS)质控方法,应用Westgard多规则理论对质控样品进行评估。方法利用HPLC-MS/MS建立人全血中环孢素A和他克莫司的血药浓度检测方法。对治疗药物监测过程中低、中... 详细信息

目的建立环孢素A和他克莫司治疗药物监测的高效液相色谱-串联质谱(HPLC-MS/MS)质控方法,应用Westgard多规则理论对质控样品进行评估。方法利用HPLC-MS/MS建立人全血中环孢素A和他克莫司的血药浓度检测方法。对治疗药物监测过程中低、中、高3个浓度水平的质控样品进行统计分析,绘制Levery-Jennings和Z分数质控图,应用Westgard多规则理论进行室内质控评估。结果环孢素A和他克莫司的线性范围分别为10.40~1040.00和0.50~49.50 ng·mL^(-1),定量下限分别为10.40和0.50 ng·mL^(-1),提取回收率分别为108.61%~113.24%和101.99%~109.37%,内标归一化的基质因子分别为106.68%~111.27%和95.70%~97.81%,日内和日间的准确度及精密度均小于15.0%,其他参数也均符合生物样本定量分析要求。Levery-Jennings和Z分数质控图显示,2022年第三季度26组质控样品的检测结果提出警告4次(违反12s规则),未出现失控现象。结论建立的环孢素A和他克莫司治疗药物监测室内质控体系能够有效保障血药浓度检测的准确性。

关键词：环孢素A 他克莫司高效液相色谱-串联质谱治疗药物监测 Westgard多规则理论质控图

Exposure to bifenthrin disrupts the development of testis in male Sebastiscus marmoratus

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Acta Oceanologica Sinica 2017年第2期36卷 57-61页

作者： LI Jinshou LUO Fen LIU Liyue RUAN junfeng WAng Nannan Department of Biology Ningde Normal University Ningde 352100 China

Bifenthrin（BF） is a pyrethroid insecticide that is widely used in agriculture, horticulture, and for residential purposes. However, few studies addressing the reproductive toxicity of BF on fishes are available. The present study was conducted to investigate the effects of BF on testicular development in Sebastiscus marmoratus and to gain insight into its mechanism. After exposure to 1, 10 and 100 ng/L BF for 50 days, there was a reduced number of mature sperm and an abundance of the late stages of spermatocysts in the testes. The levels of 17β-estradiol and testosterone were decreased significantly after BF exposure. The activity of caspase-3 was increased in a dosedependent manner after BF exposure, TUNEL assay indicated that BF exposure resulted in the occurrence of apoptosis in the testes, which might be main reason for the inhibition of spermatogenesis.

关键词： bifenthrin apoptosis reproductive toxicity Sebastiscus marmoratus

Nitrous oxide emissions from a maize field during two consecutive growing seasons in the North China Plain

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Journal of Environmental Sciences 2012年第1期24卷 160-168页

作者： Yuanyuan zh.ng junfeng Liu Yujing Mu zhu Xu Shuwei Pei Xiaoxiu Lun Ying zh.ng Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China Graduate School of Chinese Academy of Sciences Beijing 100039China College of Environmental Science and Engineering Beifing Forestry UniversityBeijing 100083China School of Economics and Management Beijing Forestry UniversityBeijing 100083China

Nitrous oxide （N 2 O） emissions from a maize field in the North China Plain （Wangdu County,Hebei Province,China） were investigated using static chambers during two consecutive maize growing seasons in the 2008 and *** N 2 O pulse emissions occurred with duration of about 10 days after basal and additional fertilizer applications in the both *** average N 2 O fluxes from the CK （control plot,without crop,fertilization and irrigation）,NP （chemical N fertilizer）,SN （wheat straw returning plus chemical N fertilizer）,OM- 1/2N （chicken manure plus half chemical N fertilizer） and OMN （chicken manure plus chemical N fertilizer） plots in 2008 were 8.51,72.1,76.6,101,107 ng N/（m 2 ·sec）,respectively,and in 2009 were 33.7,30.0 and 35.0 ng N/（m 2 ·sec） from CK,NP and SN plots,*** emission factors of the applied fertilizer as N 2 O-N （EFs） were 3.8% （2008） and 1.1% （2009） for the NP plot,3.2% （2008） and 1.2% （2009） for the SN plot,and 2.8% and 2.2% in 2008 for the OM-1/2N and OMN plots,*** properties of the investigated soil （with gley） are in favor of *** large differences of the soil temperature and water-filled pore space （WFPS） between the two maize seasons were suspected to be responsible for the significant yearly *** with the treatments of NP and SN,chicken manure coupled with compound fertilizer application significantly reduced fertilizer loss rate as N 2 O-N.

关键词： nitrous oxide fertilizers wheat straw manure maize field North China Plain

PCT和PSPN对急性髓系白血病化疗期间发热性中性粒细胞减少症患者细菌感染的鉴别价值

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现代肿瘤医学 2024年第9期32卷 1703-1708页

作者：曲伟商军锋邹慧琳杨瑞芳滨州医学院烟台附属医院输血科山东烟台264100 东营市东营区人民医院检验科山东东营257000 滨州医学院烟台附属医院血液内科山东烟台264100 滨州医学院烟台附属医院医学检验科山东烟台264100

目的:探讨降钙素原(procalcitonin,PCT)和可溶性白细胞分化抗原14亚型(soluble cell differentiation antigen 14,sCD14,又称presepsin,PSPN)对急性髓系白血病(acute myeloid leukemia,AML)化疗期间发热性中性粒细胞减少症(febrile neutropenia,FN)患者细菌感染的鉴别价值。方法:纳入2018年07月至2022年02月期间在我院接受化疗且出现FN的121例AML患者,分为非细菌感染组化疗期间发生FN且发热原因不明(细菌培养阴性,无临床迹象表明存在感染)与细菌感染组菌血症(血培养阳性)和局部感染(血培养阴性,细菌培养提示局部感染)。通过酶联免疫吸附试验试剂盒检测FN发病第1至3天血浆PCT和PSPN水平。结果:与非细菌感染组相比,细菌感染组患者FN发病第1至3天的PCT和PSPN水平明显更高,差异有统计学意义(Png/mL或者PSPN≥2.40μg/L,FN细菌感染风险显著增加(P0.05)。结论:PCT较PSPN在区分FN细菌感染性病因和非感染病因方面准确性更高,其浓度与细菌性脓毒症的严重程度有关;二者联用能进一步提高PCT对FN细菌感染的诊断效能。

关键词：降钙素原可溶性白细胞分化抗原14亚型急性髓系白血病感染性发热性中性粒细胞减少症

Rapid and Scalable Synthesis of Prussian Blue Analogue Nanocubes for Electrocatalytic Water Oxidation

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Chinese Journal of Chemistry 2021年第9期39卷 2347-2353页

作者： Wenbin Sun Zimeng Wei Jindi Qi Luyao Kang Jiechen Li junfeng Xie Bo Tang Yi Xie College of Chemistry Chemical Engineering and Materials ScienceCollaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of ShandongKey Laboratory of Molecular and Nano ProbesMinistry of EducationInstitute of Molecular and Nano ScienceShandong Normal UniversityJinanShandong 250014China Hefei National Laboratory for Physical Sciences at the Microscale CAS Center for Excellent in Nanoscale University of Science and Technology of China.HefeiAnhui 230026China

Design and fabrication of earth-abundant electrocatalysts for oxygen evolution reaction(OER)is essential in improving the overall ef-ficiency of water *** this work,we proposed a rapid and scalable synthesis route for fabricating Prussian blue analogue(PBA)nano cubes with tun able compositi ons and uniform particle *** the structural ben efits of abu ndant surface sites,facile charge transfer behavior and favorable Co^(2+)-to-Co^(3+)pre-oxidation reaction,fast generation and accumulation of the catalytically active Co3+sites can be achieved for the CoCo PBA nano cubes,leadi ng to remarkable OER activity with simulta neously achieved low overpotential,large anodic current density,small Tafel slope as well as outstanding intrinsic *** note,by performing Iong-term OER operati on,the CoCo PBA nano cubes exhibit a remarkable 5.5-folds performs nee enhan ceme nt,and obvious surface rec on struc-tion and the accumulation of high-valence Co species can be identified,proving the crucial role of pre-oxidation process in boosting the OER *** work proposed a un iversal approach for the rapid,scalable and con trollable fabricati on of the PBA-based materials,and the elucidation of the pre-oxidation process in facilitating the OER catalysis may provide useful guidanee for designing and optimizing advanced catalysts for energy-related electro-oxidation reactions in the future.

关键词： Electrochemistry Energy conversion Water splitting Prussian blue analogue Synthesis design