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微型钢板内固定治疗掌指骨骨折的恢复效果与并发症情况评估

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中外医疗 2024年第4期43卷 50-53页

作者：郑明东陈明彦高溪源福建省东山县医院福建漳州363400

目的研究掌指骨骨折患者应用微型钢板内固定治疗的恢复效果及并发症发生情况。方法便利选取2021年1月-2023年1月福建省东山县医院收治的56例掌指骨骨折患者为研究对象,按照随机数表法分为对照组和观察组,各28例。对照组应用克氏针内固... 详细信息

目的研究掌指骨骨折患者应用微型钢板内固定治疗的恢复效果及并发症发生情况。方法便利选取2021年1月-2023年1月福建省东山县医院收治的56例掌指骨骨折患者为研究对象,按照随机数表法分为对照组和观察组,各28例。对照组应用克氏针内固定治疗,观察组应用微型钢板内固定治疗,比较两组治疗效果。结果观察组掌指关节功能恢复优良率为96.43%,高于对照组的71.43%,差异有统计学意义(χ^(2)=4.766,P<0.05)。观察组手术时间长于对照组,骨折愈合时间和功能锻炼开始时间短于对照组,差异有统计学意义(P均<0.05)。观察组疼痛程度评分低于对照组,手指总主动屈曲度和生活质量评分高于对照组,差异有统计学意义(P均<0.05)。观察组并发症发生率低于对照组,差异有统计学意义(P<0.05)。结论采取微型钢板内固定的方式治疗掌指骨骨折患者,可以显著提升恢复效果,该方法虽手术时间相对略长,但并发症更少,且疼痛症状较轻,有助于提升患者生活质量。

关键词：掌指骨骨折微型钢板内固定并发症功能恢复优良率

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超细颗粒特性及其对成浆性能的影响

煤炭技术 2024年第9期43卷 272-277页

作者：宋方林郑明东刘涛陈岩桂国阳安徽理工大学化学工程学院安徽淮南232001 安徽理工大学安徽省现代煤炭加工技术研究院安徽淮南232001

从表面含氧官能团和孔隙结构来揭示了超细颗粒的理化特性,并且探究了超细颗粒加入后,对浆体浓度和成浆性能的影响。采用ZN煤(粒径为80~70μm)成浆浓度为68%,随着超细颗粒(<10μm)的加入,所制成的水煤浆浓度达到71%。改变加入超细颗粒的... 详细信息

从表面含氧官能团和孔隙结构来揭示了超细颗粒的理化特性,并且探究了超细颗粒加入后,对浆体浓度和成浆性能的影响。采用ZN煤(粒径为80~70μm)成浆浓度为68%,随着超细颗粒(<10μm)的加入,所制成的水煤浆浓度达到71%。改变加入超细颗粒的占比,通过测量其黏度-剪切速率和Zeta电位变化发现,适量超细颗粒加入能够改善水煤浆的流变特性和稳定性。使用BET和SEM对超细颗粒的孔隙结构和浆体表面的微观形貌分析发现,超细颗粒的比表面积相对较大,颗粒接近于球形,有利于整个浆体的流动性能,并且能够改善水煤浆的聚沉现象等。

关键词：水煤浆超细颗粒理化特性成浆性

Effects of fractal surface on rheological behavior and combustion kinetics of modified brown coal water slurries

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International Journal of Coal Science & Technology 2015年第3期2卷 211-222页

作者： Zhifang Gao Shuquan Zhu mingdong zheng ZhaojinWu Huihong Lu Weiming Liu School of Metallurgy and Resource Anhui University ofTechnology Ma'anshan 243002 China School of Chemical and Environmental Engineering ChinaUniversity of Mining and Technology (Beijing)Beijing 100083 China

The paper reports the effects of surface fractal structures on the rheological behavior and combustion kinetics of raw brown coal and three modified coal water slurries （CWSs）. The results show that the fractal structures and physicochemical properties of samples are dependent on various modification processes. The apparent viscosities of the coal water slurries increase with increasing surface fractal dimensions （D）, especially with decreasing shear rates. Fur- thermore, it has been proved that the ignition temperatures and apparent activation energies of modified CWSs are lower than that of raw coal water slurry. Compared with the traditional qualitative analysis of the effect of pore structures on CWSs properties, D can more efficiently indicate the quantificational effect of pore structures on the rheological behavior and combustion kinetics of CWSs.

关键词： Coal water slurry Modification processes Fractal surface Rheological behavior Combustion kinetics

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混合焦等温热反应性的变化规律

煤炭转化 2016年第4期39卷 56-60页

作者：张小勇冯正郑明东程飞安徽工业大学化学与化工学院煤的洁净转化与综合利用安徽省重点实验室安徽马鞍山博士副教授243002

研究了不同比例下顶装焦与捣固焦均匀混合后焦炭的等温连续热反应,结果表明:当顶装焦与捣固焦分别以3∶1,2∶1和1∶1的质量比混合进行反应时,捣固焦优先于顶装焦与CO2反应,使顶装焦的反应性(CRI)较单独使用时明显降低,反应后强度(CSR)... 详细信息

研究了不同比例下顶装焦与捣固焦均匀混合后焦炭的等温连续热反应,结果表明:当顶装焦与捣固焦分别以3∶1,2∶1和1∶1的质量比混合进行反应时,捣固焦优先于顶装焦与CO2反应,使顶装焦的反应性(CRI)较单独使用时明显降低,反应后强度(CSR)明显改善.随捣固焦混合比例的增加,混合焦炭的CRI增大,CSR减小,其中,顶装焦的CRI减小,CSR增大,捣固焦的CRI增大,CSR减小,并且混合焦炭的CSR和CRI的实测值与计算值接近.混合焦炭可使优质焦得到保护,保障焦炭整体的骨架支撑作用.

关键词：顶装焦捣固焦混合焦反应性反应后强度

Plate tectonics in the Archean:Observations versus interpretations

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Science China Earth Sciences 2024年第1期67卷 1-30页

作者： YongFei zheng School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Key Laboratory of Crust-Mantle Materials and Environment Chinese Academy of SciencesHefei 230026China Center of Excellence for Comparative Planetology Chinese Academy of SciencesHefei 230026China

Plate tectonics theory,established in the 1960s,has been successful in explaining many geological phenomena,processes and events that occurred in the ***,the theory has often struggled to provide a coherent framework in interpreting geological records in continental interior and Precambrian *** dealing with the relationship between plate tectonics and continental geology,continental interior tectonics was often separated from continental margin tectonics in the inheritance and development of their structure and *** separation led to the illusion that the plate tectonics theory is not applicable to Precambrian geology,particularly in explaining the fundamental geological characteristics of Archean *** this illusion does not mean that the Archean continental crust did not originate from a regime of plate tectonics,it led to the development of alternative tectonic models,often involving vertical movements under a regime of stagnant lid tectonics,including not only endogenous processes such as gravitational sagduction,mantle plumes and heat pipes but also exogenous processes such as bolide *** vertical processes were not unique to the Archean but persisted into the *** result from mantle poloidal convection at different depths,not specific to any particular *** the plate tectonics theory from the traditional kinematic model in the 20th century to a holistic kinematic-dynamic model in the 21st century and systematically examining the vertical transport of matter and energy at plate margins,it is evident that plate tectonics can explain the common geological characteristics of Archean cratons,such as lithological associations,structural patterns and metamorphic *** deciphering the structure and composition of convergent plate margins as well as their dynamics,the formation and evolution of continental crust since the Archean can be divided into ancient plate tectonics in the Preca

关键词： Plate tectonics Archean geology Continental origin Crustal reworking Plate interior Plate margin

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混合型乳化液膜对焦化废水中氨氮的处理

膜科学与技术 2014年第1期34卷 101-103,110页

作者：宋龙张小勇郑明东安徽工业大学化学与化工学院、煤的洁净转化与综合利用省重点实验室马鞍山243002

研究了Span-80、Tween-80和四氯化碳为主要原料制备的乳化液膜处理焦化废水,与以Span-80为单一表面活性剂制备的乳化液膜处理焦化废水进行比较.考察了乳化剂的类型、亲水-亲油平衡值、乳化剂用量、硫酸浓度等各种影响因素对氨氮去除率... 详细信息

研究了Span-80、Tween-80和四氯化碳为主要原料制备的乳化液膜处理焦化废水,与以Span-80为单一表面活性剂制备的乳化液膜处理焦化废水进行比较.考察了乳化剂的类型、亲水-亲油平衡值、乳化剂用量、硫酸浓度等各种影响因素对氨氮去除率的影响,得出最佳条件:亲水-亲油平衡值(HLB)为5.19,乳化剂用量为0.8g,内相硫酸浓度为0.25mol/L,乳化液膜对于焦化废水中氨氮的去除率可达99.9%.同时,通过两种乳化液膜对焦化废水处理的比较说明,混合型乳化液膜对氨氮去除率要比单一型更好.

关键词：油水平衡乳化液膜氨氮去除率焦化废水

Discovery of the Significant Impacts of Swell Propagation on Global Wave Climate Change

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Journal of Ocean University of China 2024年第3期23卷 594-604页

作者： zheng Chongwei Dalian Naval Academy Dalian 116018China Marine Resources and Environment Research Group on the Maritime Silk Road Dalian 116018China

This study compared the differences in the wave climate in the South China Sea and North Indian Ocean under these two datasets:ERA-40 wave reanalysis and Mei’s hindcast wave *** the numerical calculation of regional ocean waves,the wave climate characteristics exhibited significant bias if the influence of external swells(swells from afar)was not fully considered,which may provide an incorrect basis for global climate change analysis.1)The trends of the significant wave height(SWH)obtained from the two datasets showed significant differences,such as those of the Bay of Bengal and the Java Sea in *** the past 45 years,SWH from ERA-40(SWH-ERA)exhibited a significant annual increase in low-latitude waters of the North Indian Ocean(0.2-0.6 cm yr^(-1))and South China Sea(0.2-0.8 cm yr^(-1)).2)In the Bay of Bengal,the SWH-ERA in each month was generally 0.5 m higher than the SWH from Mei’s hindcast wave data(SWH-Mei)and can reach 1.0 m higher in some months.3)In the Bay of Bengal,SWH-ERA and SWH-Mei increased significantly at annual rates of 0.13 and 0.27 cm yr^(-1),*** increasing trend was mainly reflected after ***-ERA showed a trough in 1975(1.33 m)and a crest in 1992(1.83 m),which were not reflected in SWH-Mei.

关键词： wave climate climatic trend monthly variation annual variation external swell

A positive trend in the stability of global offshore wind energy

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Acta Oceanologica Sinica 2024年第1期43卷 123-134页

作者： Chongwei zheng Dalian Naval Academy Dalian 116018China Marine Resources and Environment Research Group on the Maritime Silk Road Dalian 116018China Shandong Provincial Key Laboratory of Ocean Engineering Ocean University of ChinaQingdao 266100China

The recognition on the trend of wind energy stability is still extremely rare,although it is closely related to acquisition efficiency,grid connection,equipment lifetime,and costs of wind energy *** the 40-year(1979–2018)ERA-Interim data from the European Center for Medium-Range Weather Forecasts,this study presented the spatial-temporal distribution and climatic trend of the stability of global offshore wind energy as well as the abrupt phenomenon of wind energy stability in key regions over the past 40 years with the climatic analysis method and Mann-Kendall(M-K)*** results show the following 5 points.(1)According to the coefficient of variation(C_(v))of the wind power density,there are six permanent stable zones of global offshore wind energy:the southeast and northeast trade wind zones in the Indian,Pacific and Atlantic oceans,the Southern Hemisphere westerly,and a semi-permanent stable zone(North Indian Ocean).(2)There are six lowvalue zones for both seasonal variability index(S_(v))and monthly variability index(M_(v))globally,with a similar spatial distribution as that of the six permanent stable zones.M_(v) and S_(v) in the Arabian Sea are the highest in the world.(3)After C_(v),M_(v) and S_(v) are comprehensively considered,the six permanent stable zones have an obvious advantage in the stability of wind energy over other sea areas,with C_(v) below 0.8,M_(v) within 1.0,and S_(v) within 0.7 all the year round.(4)The global stability of offshore wind energy shows a positive climatic trend for the past four decades.C_(v),M_(v) and S_(v) have not changed significantly or decreased in most of the global ocean during 1979 *** is,wind energy is flat or more stable,while the monthly and seasonal variabilities tend to shrink/smooth,which is beneficial for wind energy utilization.(5)C_(v) in the low-latitude Pacific and M_(v) and S_(v) in both the North Indian Ocean and the low-latitude Pacific have an obvious abrupt phenomenon at the end of

关键词： global oceans wind energy stability spatial-temporal distribution climatic trend

Wind power and sand/dust storms

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Science China(Physics,Mechanics & Astronomy) 2024年第4期67卷 175-176页

作者： XiaoJing zheng Center for Particle-Laden Turbulence Lanzhou UniversityLanzhou 730000China

Sand/dust storms,a globally prevalent catastrophic weather phenomenon,can cause significant erosion to the climate and ecological *** high concentration of sand particles they carry not only impacts atmospheric qualit... 详细信息

关键词： Wind power and sand/dust storms