检索结果-南通市图书馆

酸性干湿循环下赤泥-石灰固化镉铅污染土性能

在线全文

学校读者我要写书评

暂无评论

有色金属工程 2024年第5期14卷 135-142页

作者：李丽华毛望裴尧尧唐宗振李贲杨俊超湖北工业大学土木建筑与环境学院河湖健康感知与生态修复教育部重点实验室武汉430068 广州市第一市政工程有限公司广州510060

为实现固废资源化利用并达到以废治废,变废为宝的目的,提出采用赤泥-石灰作为固化剂对镉、铅重金属污染土进行固化/稳定化处理,通过酸性干湿循环试验、无侧限抗压强度试验、毒性浸出试验以及微观结构分析,研究不同固化剂配比、污染物浓... 详细信息

为实现固废资源化利用并达到以废治废,变废为宝的目的,提出采用赤泥-石灰作为固化剂对镉、铅重金属污染土进行固化/稳定化处理,通过酸性干湿循环试验、无侧限抗压强度试验、毒性浸出试验以及微观结构分析,研究不同固化剂配比、污染物浓度、溶液pH值和干湿循环次数对赤泥-石灰固化剂固化污染土的质量损失率、强度变化、毒性浸出浓度以及微观形态的影响。结果表明:在各种条件下,R4c4固化土质量损失率最低;在溶液pH值为7、干湿循环下,固化土抗压强度随石灰掺量增加而增加,随循环次数的增加先增大后减小,在循环次数为两次时达到峰值;溶液pH值减小时,强度也随之减小;浸出浓度随循环次数以及溶液pH值的增大而增大,在初始浓度为M1时所有试样均满足标准要求;在多次酸性干湿循环后土体出现裂缝,且水化物减少导致结构被破坏。

关键词：酸性干湿循环镉、铅污染土赤泥抗压强度浸出浓度

同方期刊数据库

患者首次输血后短期内产生不规则抗体致血型正反定型不一致分析

在线全文

学校读者我要写书评

暂无评论

临床血液学杂志 2024年第6期37卷 429-431,436页

作者：贲燕华王峻霞夏和凤韩霜东台市人民医院输血科江苏东台224200

目的分析患者首次输血后短期内产生不规则抗体对血型正反定型的影响,正确鉴定患者血型和不规则抗体特异性,保证临床输血安全。方法采用试管法、凝聚胺法、微柱凝胶卡式法进行不规则抗体筛选、抗体鉴定试验、Rh分型及直接抗人球蛋白试验... 详细信息

目的分析患者首次输血后短期内产生不规则抗体对血型正反定型的影响,正确鉴定患者血型和不规则抗体特异性,保证临床输血安全。方法采用试管法、凝聚胺法、微柱凝胶卡式法进行不规则抗体筛选、抗体鉴定试验、Rh分型及直接抗人球蛋白试验分析不规则抗体特异性;2-巯基乙醇(2-ME)处理标本后鉴定血型。结果患者血型为B型Rh阳性,Rh分型为ccDEE,血清中检出IgM、IgG抗-c。结论患者首次输血后即可产生具有临床意义的特异性不规则抗体,建议对献血者和患者进行Rh血型系统抗原(ccEe)分型,可以快速匹配抗原相合血液,避免因抗体筛查阳性引起交叉配血困难而延误患者的输血治疗,减少不规则抗体引起的溶血性输血反应的发生。

关键词：不规则抗体抗-c IgG IgM

藏北两个临近不同高寒草地碳通量对气候条件的响应

在线全文

学校读者我要写书评

暂无评论

草业学报 2024年第6期33卷 1-16页

作者：徐玲玲牛犇张宪洲何永涛石培礼宗宁武建双王向涛中国气象局国家气象中心北京100081 中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室拉萨高原生态试验站北京100101 中国科学院大学资源与环境学院北京100049 中国农业科学院农业环境与可持续发展研究所北京100081 西藏农牧学院动物科学学院西藏林芝860000

生态系统碳循环应对气候变化的敏感性研究是“碳中和”背景下的重要议题。青藏高原高寒草地面积广阔,碳储量丰富,脆弱性高,近年来随着观测技术尤其是涡度相关技术和模拟技术的发展,已有不少研究致力于揭示青藏高原高寒草地生态系统碳水... 详细信息

生态系统碳循环应对气候变化的敏感性研究是“碳中和”背景下的重要议题。青藏高原高寒草地面积广阔,碳储量丰富,脆弱性高,近年来随着观测技术尤其是涡度相关技术和模拟技术的发展,已有不少研究致力于揭示青藏高原高寒草地生态系统碳水通量对气候变化的响应过程。但是,相同气候背景下不同高寒草地类型对环境变化的响应规律及敏感性尚不清楚。本研究基于藏北高原两个临近的高寒草地生态系统,高寒草甸和高寒湿地涡度相关观测的碳水通量数据,对比分析了不同水分条件下藏北高寒草甸和高寒湿地碳循环的气候敏感性。结果表明,高寒草甸的碳交换量要显著小于高寒湿地,高寒草甸是碳中性的,年净cO_(2)交换量为(18.09±40.66) g c·m^(-2) ,而高寒湿地是稳定的碳汇,年净cO_(2)固定量为(155.09±32.85)g c·m^(-2) 。水分条件对高寒草甸和高寒湿地植被光响应曲线最大的光合速率(α)的影响较弱,与饱和光强下的总初级生产力(Amax)呈显著正相关关系。水分对生态系统呼吸与温度的指数响应关系的调节作用主要体现在基础呼吸值(a)上,高寒湿地a的均值是高寒草甸的3.76倍,而对两个高寒草地生态系统呼吸敏感性(Q10)的调节均不显著。高寒草甸和高寒湿地Q10的均值(1.84)以及随温度升高而减小的趋势基本一致。藏北高寒草地生态系统的碳源汇特征对环境因子的响应取决于多因素共同限制,因此,基于区域性的联网协同观测有助于更加清晰地理解高寒生态系统碳交换响应气候变化的机理。

关键词：碳循环高寒草地气候敏感性藏北高原

Assessment of occupational exposure in medical practice in Gabon during 2013–2020

同方期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Radiation Medicine and Protection 2023年第2期4卷 109-115页

作者： P.Ondo Meye S.Y.Loemba Mouandza G.B.Dallou Y.Omon B.c.Mabika Ndjembidouma c.chaley G.H.ben-Bolie General Directorate for Radiation Protection and Nuclear Safety Ministry of Energy and Hydraulic ResourcesBP 1172LibrevilleGabon Laboratory of Atomic Molecular and Nuclear PhysicsDepartment of PhysicsFaculty of ScienceUniversity of Yaounde IBP 812YaoundeCameroon Department of Physics Faculty of SciencesUniversity of Sciences and Techniques of MasukuBP 943FrancevilleGabon University Marien Ngouabi Faculty of Science and TechniquesBP 69BrazzavilleCongo National Institute of Research in Exact and Natural Sciences BP 2400BrazzavilleCongo Department of Physics Faculty of SciencesUniversity of BanguiCentral African Republic AKANDA cancer Institute BP 23902LibrevilleGabon

ObjectiveTo evaluate whole-body,extremity and eye-lens occupational dose equivalents of ionizing radiation to Occupationally Exposed Workers(OEWs)in Gabon,monitored by the national Individual Monitoring Service(IMS),in the medical *** total of 816 dose records for 205 OEWs were *** were collected for an eight-year period,from 2013 to *** public and private hospitals were involved,including a cancer centre where radiotherapy(RT)and nuclear medicine(NM)procedures are regularly *** were monitored,on a monthly or quarterly basis,for whole-body dose and extremity dose using an optically stimulated luminescence(OSL)dosimeter worn on the torso or the wrist,as ***-lens dose was estimated from whole-body dose *** whole-body dose distribution was skewed and the zero dose was associated with a probability of 47%.Some recorded doses were associated with estimated X-ray energies above those typically encountered in diagnostic radiology,thus suggesting that some doses attributed to workers and believed to be due to X-rays may in fact be due to background radiation(false positive dose records).For the period 2013–2020,annual doses to OEWs in diagnostic radiology(DR),NM and RT departments were 0.40 mSv,0.38 mSv and 0.09 mSv,*** the same period,the mean annual extremity and eye-lens doses were 0.78 mSv(range:0–5.24mSv)and 0.35 mSv(range:0–3.74mSv),*** little effort by the national IMS and the regulatory body,annual whole-body doses to workers can be kept well below 6mSv,thus efficiently contributing to the optimization of worker's ***,extremity doses may in fact be greater than those reported for OEWs in the NM ***,eye-lens doses were well below the new annual dose limit of 20 mSv,thus demonstrating that,in the current situation,OEWs in the NM department do not require routine eye lens dose ***,whole-body dose may be used as an i

关键词： Occupational exposure Whole-body dose Extremity dose Eye-lens dose Reference levels

chemistry and particle size distribution of respirable coal dust in underground mines in central Eastern Europe

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of coal Science & Technology 2022年第1期9卷 200-216页

作者： Pedro Trechera Xavier Querol Robert Lah Diane Johnson Aleksander Wrana ben Williamson Teresa Moreno Instituto de Diagnostico Ambiental Y Estudios del Agua Consejo Superior de Investigaciones Cientificas(IDAEACSIC)C/Jordi Girona 18‑2608034 BarcelonaSpain Department of Natural Resources and Environment Industrial and TIC Engineering(EMIT-UPC)08242 ManresaSpain Premogovnik Velenje d.d Partizanskacesta 783320 VelenjeSlovenia camborne School of Mines University of ExeterPenrynCornwall TR109FEUK Department of Extraction Technology and Mining Support Central Mining Institute(GIG)40‑166 KatowicePlacGwarkow 1Poland

Despite international efforts to limit worker exposure to coal dust,it continues to impact the health of thousands of miners across *** coal dust has been studied to improve risk models and its control to protect *** size distribution analyses shows that using spraying systems to suppress airborne dusts can reduce particulate matter concentrations and that coals with higher ash yields produce finer *** are marked chemical differences between parent coals and relatively coarse deposited dusts(up to _(500)μm,DD_(500)).Enrichments in ca,K,Ba,Se,Pb,cr,Mo,Ni and especially As,Sn,cu,Zn and Sb in the finest respirable dust fractions could originate from:(i)mechanical machinery wear;(ii)variations in coal mineralogy;(iii)coal fly ash used in shotcrete,and carbonates used to reduce the risk of *** enrichments in ca in mine dusts are attributed to the use of such concrete,and elevated K to raised levels of phyllosilicate mineral *** concentrations are higher in the parent coal than in the DD_(500),probably due to relatively lower levels of organic *** concentrations of all elements observed in this study remained below occupational exposure limits.

关键词： coal dust Deposited dust Respirable dust Particle size distribution Dust chemistry PM10 coal dust exposure

Adsorption of rare earth elements onto diatomite M45:Experimental investigations and modeling with statistical physics theory

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2023年第11期41卷 1805-1811,I0006页

作者： Fatma Dhaouadi Guilherme L.Dotto Julien Vieillard Diana Pinto Luis F.O.Silva Éder c.Lima Mu Naushad Fatma Aouaini Samia Nasr Adrián Bonilla-Petriciolet Abdelmottaleb ben Lamine Laboratory of Quantum and Statistical Physics LR18ES18Faculty of Sciences of MonastirMonastir UniversityMonastirTunisia Research Group on Adsorptive and catalytic Process Engineering(ENGEPAc) Federal University of Santa MariaAv.Roraima1000-797105–900Santa MariaRSBrazil NormandieUniversité UNIROUENINSA RouenCNRSCOBRA(UMR 6014)27000EvreuxFrance Universidad De La costa Calle 58#55-66080002BarranquillaAtlánticoColombia Advanced Materials Research chair Department of ChemistryCollege of ScienceKing Saud UniversityRiyadh11451Saudi Arabia Department of chemistry College of ScienceBuilding#5King Saud UniversityRiyadhSaudi Arabia Department of Physics College of SciencePrincess Nourah Bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabia Research center for Advanced Materials Science(RcAMS) King Khalid UniversityAbha61413P.O.Box 9004Saudi Arabia chemistry Department Faculty of ScienceKing Khalid UniversityP.O.Box 9004Abha61413Saudi Arabia Instituto Tecnológico de Aguascalientes 20256AguascalientesMexico

The separation of rare earth elements using diatomite M45 from aqueous solutions was *** experimental isotherms for the adsorption of trivalent lanthanum,cerium,and neodymium cations on this adsorbent were quantified under strongly acidic conditions(pH 2)at 298-328 *** adsorption equilibria of these earth elements were analyzed using two statistical physics models(homogeneous and heterogeneous monolayer models).The results show that the adsorption of these ions implies a multiionic mechanism,which is ***-containing functional groups are responsible for the adsorption of these rare-earth elements on the diatomite surface.A heterogeneous statistical physics model confirms that two Si-based functional groups participate in the separation of these *** calculated adsorption capacities at saturation follow the order:neodymium>cerium>*** interaction energies range from 28600 to 40100 J/mol,indicating physical adsorption on diatomite *** study demonstrates that diatomite M45 is a promising separation medium that can be used for the recovery of REEs dissolved in aqueous solutions via adsorption.

关键词： Lanthanum cerium Neodymium Adsorption Diatomite M45 Statistical physics model

丹蛭降糖胶囊联合利拉鲁肽对肥胖型2型糖尿病患者胰岛β细胞功能、糖脂代谢及BMI的影响

在线全文

学校读者我要写书评

暂无评论

山西中医 2024年第4期40卷 19-21页

作者：王奔刘剑方朝晖杨萍萍严瑜珊安徽中医药大学第一临床医学院合肥230038 安徽中医药大学第一附属医院安徽中医药大学

目的:观察丹蛭降糖胶囊联合利拉鲁肽对肥胖型2型糖尿病患者胰岛β细胞功能、糖脂代谢及BMI的影响。方法:将80例肥胖型2型糖尿病患者随机分为两组各40例。对照组予利拉鲁肽治疗,治疗组在对照组基础上口服丹蛭降糖胶囊。治疗12周后比较两... 详细信息

目的:观察丹蛭降糖胶囊联合利拉鲁肽对肥胖型2型糖尿病患者胰岛β细胞功能、糖脂代谢及BMI的影响。方法:将80例肥胖型2型糖尿病患者随机分为两组各40例。对照组予利拉鲁肽治疗,治疗组在对照组基础上口服丹蛭降糖胶囊。治疗12周后比较两组治疗前后空腹血糖、餐后2h血糖、糖化血红蛋白、三酰甘油、总胆固醇、高密度脂蛋白胆固醇、低密度脂蛋白胆固醇及胰岛β细胞功能、BMI的变化。结果:治疗后两组患者FPG、2hPG、HbA1c、TG、Tc、LDL-c、HOMA-IR、BMI水平均降低;HDL-c、HOMA-β水平均升高(P﹤0.05),且治疗组疗效优于对照组,差异有统计学意义(P﹤0.05)。结论:丹蛭降糖胶囊与利拉鲁肽联合使用可显著改善肥胖2型糖尿病患者的糖脂代谢水平、减轻体重并改善胰岛素抵抗,从而有力防控糖尿病进展。

关键词： 2型糖尿病肥胖丹蛭降糖胶囊利拉鲁肽中西医结合疗法

In-situ formation of Ti-Mo biomaterials by selective laser melting of Ti/Mo and Ti/Mo_(2)c powder mixtures:A comparative study on microstructure,mechanical and wear performance,and thermal mechanisms

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第20期115卷 81-96页

作者： Qimin Shi Shoufeng Yang Yi Sun Yifei Gu ben Mercelis Shengping Zhong Bart Van Meerbeek constantinus Politis KU Leuven Department of Biomedical SciencesOMFS-IMPATH Research Group&UZ Leuven(University Hospitals Leuven)Oral and Maxillofacial SurgeryKapucijnenvoer 33Leuven 3000Belgium University of Southampton Faculty of Engineering and Physical SciencesSouthampton SO171BJUnited Kingdom KU Leuven Department of Oral Health SciencesBIOMAT-Biomaterials Research Group&UZ Leuven(University Hospitals Leuven)DentistryKapucijnenvoer 7Leuven 3000Belgium

Ti-Mo alloys/composites are expected to be the next-generation implant material with low moduli but without toxic/allergic ***,synthesis mechanisms of the Ti-Mo biomaterials in Selective Laser Melting(SLM)vary according to raw materials and fundamentally influence material performance,due to inhomogeneous chemical compositions and ***,this work provides a comparative study on microstructure,mechanical and wear performance,and underlying thermal mechanisms of two promising Ti-Mo biomaterials prepared by SLM but through different synthesis mechanisms to offer scientific understanding for creation of ideal metal *** are(i)Ti-7.5 Mo alloys,prepared from a conventional Ti/Mo powder mixture,and(ii)Ti-7.5 Mo-2.4 Ti c composites,in-situ prepared from Ti/Mo_(2)c powder *** reveal that the in-situ Ti-7.5 Mo-2.4 Ti c composites made from Ti/Mo_(2)c powder mixture by SLM can produce 61.4%moreβphase and extra Ti c precipitates(diameter below 229.6 nm)than the Ti-7.5 Mo *** fine Ti c not only contributes to thinner and shorterβcolumnar grains under a large temperature gradient of 51.2 K/μm but also benefits material *** in-situ Ti-7.5 Mo-2.4 Ti c composites produce higher yield strength(980.1±29.8 MPa)and ultimate compressive strength(1561.4±39 MPa)than the Ti-7.5 Mo alloys,increasing by up to 12.1%.However,the fine Ti c with an aspect ratio of 2.71 dominates an unfavourable rise of elastic modulus to 91.9±2 GPa,44.7%higher than the Ti-7.5 Mo alloys,which,nevertheless,is still lower than the modulus of traditional Ti-6 Al-4 ***,Ti c and its homogeneous distribution benefit wear resistance,decreasing the wear rate of the in-situ Ti-7.5 Mo-2.4 Ti c composites to 6.98×10^(-4)mm^3 N^(-1)m^(-1),which is 36%lower than that of the Ti-7.5 Mo ***,although with higher modulus than the Ti-7.5 Mo alloys,the SLM-fabricated in-situ Ti-7.5 Mo-2.4 Ti c composites can expect to provide good biomedical applicati

关键词： Selective laser melting(SLM) Titanium Metal matrix composites Microstructures Mechanical properties Wear properties

在线全文

学校读者我要写书评

暂无评论

不同林内环境下苦竹新鲜残体的分解特征

林业科学研究 2024年第3期37卷 183-192页

作者：林大雪赵厚本黄春华许伟华李兆佳周志平广东省天井山林场广东天井山国家森林公园管理处广东乳源512726 中国林业科学研究院热带林业研究所广东广州510520 广东南岭国家级自然保护区广东乳源512727 南岭北江源森林生态系统国家定位观测研究站广东广州510520

[目的]研究苦竹新鲜残体的分解过程及影响因素可以预测苦竹林在受到极端气候事件导致的机械损伤后生态系统物质循环变化过程,评估灾害对森林碳汇功能的影响,为灾后森林科学管理提供依据。[方法]以广东南岭地区皆伐后苦竹大量扩张的次生... 详细信息

[目的]研究苦竹新鲜残体的分解过程及影响因素可以预测苦竹林在受到极端气候事件导致的机械损伤后生态系统物质循环变化过程,评估灾害对森林碳汇功能的影响,为灾后森林科学管理提供依据。[方法]以广东南岭地区皆伐后苦竹大量扩张的次生林为对象,设置对照(cK)和移除林下竹子(RB)两种林内环境,采用分解袋法研究了苦竹各器官新鲜残体的分解特征。[结果]苦竹各器官新鲜残体的分解过程可以分为两个阶段,即前期阶段(前2个月)质量快速损失,后期阶段(后24个月)缓慢分解。前期阶段各器官平均质量损失率依次为竹叶(51.2%)>竹枝(31.7%)>竹根(24.4%)>竹秆(16.6%),各器官间均存在显著差异(PcK。后期阶段各器官平均质量损失率依次为竹枝(40.3%)>竹叶(29.1%)>竹秆(28.1%)>竹根(19.6%),各器官间除竹叶与竹秆外均存在显著差异,RB环境下竹枝的质量损失率显著高于cK,竹根的质量损失率显著低于cK。Olson分解模型能够较好地模拟各器官的分解过程,平均分解系数(k)依次为竹叶(0.891)>竹枝(0.554)>竹秆(0.249)>竹根(0.242),各器官间除竹秆和竹根外均存在显著差异,RB环境下竹叶的k显著低于cK。各器官分解50%的周期(T_(0.5))依次为竹秆(2.48 a)>竹根(2.44 a)>竹枝(0.97 a)>竹叶(0.51 a),其中竹根和竹秆显著高于竹枝和竹叶,RB环境下竹根的T_(0.5)显著高于cK。各器官分解周期(T_(0.95))依次为竹根(12.81a)>竹秆(12.12 a)>竹枝(5.22 a)>竹叶(3.22 a),其中竹根和竹秆显著高于竹枝和竹叶,RB环境下竹秆的T0.95显著低于cK,竹根的T_(0.95)显著高于cK。各器官基质质量与分解指标间的相关系数总体上表现为前期阶段高于后期阶段,cK环境下高于RB环境下,其中碳(c)、钾(K)、c/氮(N)、c/磷(P)与分解指标间相关系数较小,N、P、N/P与分解速率呈正相关,木质素/N与分解速率呈负相关。[结论]苦竹新鲜残体的分解过程表现为前期快速失重后期缓慢分解;竹叶分解速率最快,其次为竹枝,竹秆和竹根最慢;各器官基质质量中,N、P、N/P、木质素/N对分解速率影响较大,且主要影响分解前期阶段;清除林下竹子能减缓竹叶和竹根的分解,加快竹秆和竹枝的分解,减弱基质质量对分解速率的影响。

关键词：苦竹亚热带次生林凋落物分解基质质量林下环境木质素/N