分区串并联式太阳能-地源热泵跨季节蓄热组合系统性能研究

为获得较高的取热温差与换热效率,提高系统综合性能,提出一种将地埋管群分区串并联的SAGSHP组合系统。基于TRNSYS-18建立分区串并联式SAGSHP组合系统的物理模型,利用某分区串并联式SAGSHP组合系统集中供热工程一个蓄/取热周期内的运行情况验证了模型的准确性,并利用该模型模拟研究在不同串并联分区面积、不同蓄热量的情况下,系统土壤温度场、地源热泵进出口温度、短期蓄热水箱的平均温度变化情况,得到系统最佳设计串并联分区与蓄热量,同时与同规模下传统SAGSHP系统进行性能对比。研究表明,串联区与并联区面积比为1∶4,蓄热量为3∶2时,系统具有最佳的综合性能,在该设计参数下,系统SCOP可达5.2,较传统并联系统提高13.0%,较传统串联系统提高18.1%。且分区串并联的SAGSHP系统运行状况稳定,满足末端供暖设计温度。

静脉血PCT、WBC及D-二聚体水平在肺炎合并脓毒症患儿病情诊断及预后评估的价值分析

目的检测肺炎合并脓毒症患儿静脉血降钙素原(PCT)、白细胞计数(WBC)及D-二聚体水平,并探究PCT、WBC及D-二聚体水平对肺炎合并脓毒症患儿病情诊断及预后评估的作用及关系。方法选取2018年6月-2019年12月在盐城市妇幼保健院儿科住院治疗的60例肺炎患儿作为研究对象,其中单纯患有肺炎的患儿30例作为对照组,肺炎合并脓毒症患儿30例作为研究组。检测2组患PCT、WB以及D-二聚体等表达水平;采用Logistic回归分析肺炎合并脓毒症患儿发生预后不良的相关影响因素;绘制PCT、WB以及D-二聚体联合检测的肺炎患者合并脓毒症的ROC曲线。结果观察组静脉血PCT、WBC及D-二聚体表达水平均显著高于对照组(P<0.05);ROC结果显示:静脉血PCT、WBC及D-二聚体诊断肺炎合并脓毒症的AUC分别为0.863、0.826、0.789,截断值分别为1.050ng/ml、12.90、0.95mg/l,此时对应灵敏度分别为76.7%、66.7%、56.7%,特异性分别为93.3%、96.7%、96.7%。静脉血PCT、WBC及D-二聚体联合检测肺炎合并脓毒症的AUC为0.942,此时对应灵敏度和特异性分别为86.7%、93.3%。高PCT组患儿预后不良发生率明显高于低PCT组(P<0.05);高WBC组患儿预后不良发生率显著高于低WBC组(P<0.05);高D-二聚体组患儿预后不良发生率明显高于低D-二聚体组(P<0.05)。Logistic分析显示,静脉血PCT、WBC及D-二聚体水平是影响肺炎合并脓毒症患儿发生多脏器功能衰竭或死亡的独立危险因素。结论PCT、WBC及D-二聚体在肺炎合并脓毒症患儿静脉血中表达水平明显升高,三者参与肺炎合并脓毒症的发生及发展,具有一定的诊断价值,且其表达情况与患儿预后密切相关,提示静脉血PCT、WBC及D-二聚体可作为肺炎合并脓毒症的早期诊断及预后评估的潜在生物学指标。

试论四川地区新型冠状肺炎的中医药防治

几千年来中医药在与瘟疫斗争中积累了丰富理论和经验,新型冠状病毒肺炎疫情爆发后,无数中医人深入抗疫一线,为坚决打赢这场疫情攻坚战,贡献自己的力量。笔者结合目前收集到的资料,从疫情概况、发病背景、中医病因病机、治疗四个方面对四川地区的中医药防疫特点进行梳理、归纳:四川地区的新冠肺炎病因为感受湿毒疫疠之邪,湿性缠绵,致病易蒙上流下,病位主要在肺、脾、三焦,可涉及膜原、心包、肝肾,临床症候湿像明显,中医药防治方面遵循"治未病""、扶助正气""、三因制宜""、芳香除湿贯穿始终"的原则。

Design and Applications of Land Resources and Ecological Environment Information System: A Case Study of Zigui County in the Three Gorges Area of China

The design and applications of a land information system built upon ARC/INFO and ArcView are presented. The proposed system not only maintains all the advantages of the more conventional implementations but also enhances them in the following ways: 1) the application program interfaces (API) are used to transmit data and messages among different parts of the system; 2) the integrated system can support studies on land evaluations and ecological analyses by efficient management of attribute and spatial data and 3) correspondingly, spatial records and attributive records are linked by the same identifiers (ID). A case study application in Zigui County of the Three Gorges Area in China demonstrates that the system could employ land-use maps and land property data to predicate and analyze the land utilization changes in the past, present and future. The ecological environment analysis can be carried out with the data of land, economics and terrain map used, showing that the system can be widely applied, especially to survey land and environment resources in the countryside area.

Analysis and Design of Soils and Terrain Digital Database (SOTER) Management System Based on Object-Oriented Method

A SOTER management system was developed by analyzing, designing, programming, testing, repeated proceeding and progressing based on the object-oriented method. The function of the attribute database management is inherited and expanded in the new system. The integrity and security of the SOTER database are enhanced. The attribute database management, the spatial database management and the model base are integrated into SOTER based on the component object model (COM), and the graphical user interface (GUI) for Windows is used to interact with clients, thus being easy to create and maintain the SOTER, and convenient to promote the quantification and automation of soil information application.

Multi-Suitability Evaluation of Cultivated Land in Houhu Farm Area Based on GIS and Niche-Fitness

The niche-fitness and limited factors of rice, wheat, cotton and rape inHouhu Farm area of Jianghan Plain are analyzed by weighted average model and limited factor model.The niche-fitness theory and GIS are applied to the research on multi-suitability evaluation. Thehigh values of the niche-fitness (the maximum is 0.958) indicate that the environmental conditionsbasically meet the requirements of crops in the area. Suitability evaluation of single crop showsthat the degrees of suitability are satisfactory. Comprehensive suitability evaluation shows thatthe acreage for grade 1 (highly suitable for cultivation) accounts for 18.16% of the totalcultivated land area, whereas the acreage for grade 3 (critically suitable) and grade 4 (unsuitable)only for 8.9%. The main factors limiting the potential land productivity are cation exchangecapacity (CEC), available phosphorus content and accessibility level of road.

测量标志巡查内外业一体化管理系统的设计与实现

测量标志巡查是加强测量标志管护的重要措施,传统的巡查方式存在劳动强度大、点查找难、内外业信息不能及时更新、巡查周期长等问题。结合巡查工作的实际需求,采用GIS、GPS及移动终端采集等技术,以影像和基础地理数据为支撑,提出了一套测量标志巡查信息的统一采集和管理体系,详细介绍了系统架构和主要功能,构建了测量标志巡查管理系统。系统包括桌面端管理子系统和移动端巡查子系统两部分,实现了巡查内外业信息的统一实时管理。

以问题为基础的教学模式联合以团队为基础的教学模式在骨肿瘤临床见习中的应用

目的比较以问题为基础的教学模式(problem-based learning,PBL)联合以团队为基础的教学模式(team-based learning,TBL)与传统教学法在骨肿瘤临床见习中的作用,探索较为适合骨肿瘤临床见习的带教方法。方法将2017年4月在四川大学华西医院骨科骨肿瘤亚专业进行临床见习的四川大学华西临床医学院2013级临床医学五年制专业60例学生随机分为2组,试验组采用PBL联合TBL模式教学法,对照组采用传统教学法,比较两组学生的一般情况,并于见习结束后比较两组学生的知识掌握情况、综合能力和满意度。结果两组学生的性别构成和上一学期“诊断学”课程考核成绩差异无统计学意义(P>0.05)。见习结束后,对于知识掌握情况,试验组的理论考试成绩[(89.13±3.47)vs.(87.03±2.99)分;t=2.511,P=0.015]、教师评价[(88.33±4.48)vs.(85.90±3.96)分;t=2.231,P=0.030]和学生评价[(89.83±2.97)vs.(87.47±2.91)分;t=3.117,P=0.003]均优于对照组;综合能力方面,试验组的推理归纳、信息管理、目标完成、沟通交流能力[(17.90±1.09)、(18.00±0.91)、(18.00±1.02)、(17.90±1.13)分]均优于对照组[(17.20±1.13)、(17.13±1.20)、(17.10±1.24)、(16.83±1.29)分],差异有统计学意义(P<0.05);两组学生的满意度差异无统计学意义(P>0.05)。结论PBL联合TBL模式可以增强学生在骨肿瘤临床见习中的效果,加深学生对专业知识的掌握,提高学生的综合能力,进而提高教学质量。