浅析高职院校“多维立体化”单独招生人才选拔模型

论文根据高职教育的特点和国家对高职院校招生的改革试点,构建了高职院校"多维立体化"单独招生人才选拔模型,鉴于此,作者阐述了高职院校"多维立体化"单独招生人才选拔模型的理论依据,总结分析了该模型的意义与价值。     

AE-HG-AFS测定长期汞暴露人群补硒后尿中硒的形态

建立了一种利用阴离子交换高效液相色谱与氢化物发生原子荧光光谱联用同时测定四、六价硒及硒代半胱氨酸(SeCys)形态的方法。优化了六价硒的还原条件及仪器检测参数,以不同浓度的柠檬酸铵作为流动相,在10 min内同时分离了四、六价硒及硒代半胱氨酸(SeCys)。采用加标法定量,加标回收率在90%～119%之间,相对标准偏差为1.6%～3.1%(100μg/L),四、六价硒及硒代半胱氨酸(SeCys)的检出限分别为0.32μg/L、0.47μg/L和0.44μg/L(进样量为100μL)。应用该法对长期汞暴露人群补硒后尿中的小分子硒的形态进行了分析,仅检测到硒代半胱氨酸(SeCys)。     

浅谈当前会计人员存在问题与解决途径

该文针对当前会计人员普遍存在文化水平偏低、职业道德修养欠缺等问题,提出转变观念、提高行业准入等解决途径,以全面提高会计人员综合素质,充分发挥会计职能,满足社会发展需要.     

基于AT89S52的多路温度检测设备的设计

温度检测是日常生活中最基本的环境参数。本文利用AT89S52单片机和DS18B20数字温度传感器直接相连进行温度检测,免除了传统的温度检测设备必须经过A/D转换环节才能与CPU通信的繁琐环节,具备设计简洁、成本低廉、转换功率高等优点。     

郜海燕: 为农民的四季"保鲜"

"帮助农民是我的责任."浙江省农科院研究员郜海燕说,每当收到农业广播电视学校、科协、农业厅和果蔬协会的邀请,自己一定会挤出时间赶去授课. 在农产品物流保鲜和精深加工领域,郜海燕耕耘了近40年,带动了一方方经济,富了一方方百姓.     

高职计算机专业基础课程教学模式初探

面对国内高职教育教学改革浪潮的全面推进,本文就高职教育的计算机专业基础课程教学方法作了初步探索和研究,密切联系自己和所在学校的教学实践,提出行之有效的,符合实际需求的教学方法和教学手段.     

Electrospun Small Diameter Tubes to Mimic Mechanical Properties of Native Blood Vessels Using Poly (L-lactide-co-ε-caprolactone )and Silk Fibroin: a Preliminary Study

Mismatch in mechanical properties can induce intimal hyperplasia,which is one of the main reasons for the failure of small diameter artificial blood vessels. Electrospun small diameter tubes with tailored mechanical properties were fabricated through blending poly( L-lactide-co-ε-caprolactone)( PLCL) and silk fibroin( SF)with the mass ratios of 30 /70,50 /50,and 70 /30 in this study.Scanning electron microscopy( SEM) and mechanical testing were used to characterize morphological and mechanical properties of the tubes. Results showed that tensile strength of the tubes was higher than most of the native blood vessels,and elongations at break of them were improved greatly by blending PLCL. Compliances of the tubes were all higher than 1% /13. 33 kPa( 1% /100 mmHg).Particularly,tubes with blending mass ratio of 50 /50 showed similar compliance with human native femoral arteries,which provided a promising biomaterial that could be applied on small diameter vascular applications.     

Fatigue Performance of Fabrics of Stent-Grafts Supported with Z-Stents vs. Ringed Stents

Stent-grafts were commercialized rapidly and gained a broad clinical acceptance over the past two decades. However,relatively more recent recognition of particular stent-graft design shortcomings have been identified which need to be addressed. It appears that various stent-graft designs may be more or less resistant to metal fatigue and /or fabric abrasions which can lead to type III and type IV endoleaks over the long term. Therefore,it is necessary to investigate the fatigue performance of the most common stentgraft designs: Z-stents and ringed stents,in a long-term in vitro fatigue simulation environment. This paper aimed to analyze nondestructively( gross observations) and destructively( fabric characteristics,mechanical and chemical properties) in order to put forward suggestions to improve the fabric and stent characteristics that may prevent type III and IV endoleaks. The fabric supported with ringed stent-grafts remained nearly completely intact after 168h. However, the fabric supported with Z-stents demonstrated significant damage. Fabric characteristics and tensile strength of the fibers did not present a significant difference between the control and fatigue simulated specimens. The crystallinity declined for both specimens. The fatigue performance of fabrics supported with ringed stents appears to be superior to that supported with Z-stents. The potential for a dynamic and destructive interaction between the apices of Z-stents which can lead to fraying and /or tearing of the graft fabric must be addressed in future designs.     

血液病患者红细胞输血发生免疫溶血因素分析

目的：多因素Logistic回归分析血液病患者红细胞输血效果影响因素,为血液病患者精准输血提供实验依据。方法：回顾性调查2019年8月～2021年1月兰州大学第一医院血液科接受输血治疗的血液病患者834例,其中男性483例,女性351例。利用多变量Logistic回归分析输血效果的显著风险因素。结果：（1）本院血液病患者红细胞输注无效发生率为26.9%(224/834);男性输注无效率为28.4%(137/483),女性输注无效率为24.8%(77/351);(2)不同性别血液病患者红细胞输血效果影响因素结果：妊娠次数（OR=1.813）、本次住院输血袋数（OR=2.701）、既往红细胞输注袋数10～19袋（OR=3.632）、既往红细胞输注袋数≥20袋（OR=7.421）、临床诊断（骨髓增生异常综合征、多发性骨髓瘤,OR=6.923;白血病、淋巴瘤,OR=12.779）与女性血液病患者输注无效显著正相关。本次住院输血袋数（OR=2.824）、既往红细胞输注袋数10～19袋（OR=2.467）、既往红细胞输注袋数≥20袋（OR=2.859）、临床诊断（骨髓增生异常综合征、多发性骨髓瘤,...     

甘肃省积石山县红细胞血型基因分布及精准输血中临床研究

目的:对甘肃省少数民族地区不同民族433例血液标本进行RH(C/c/E/e)、Lewis(Lw/Lw)、Duffy(Fy/Fy)等12种红细胞血型基因检测分析,为我省少数民族血液学研究、临床输血安全及稀有血型库建设等提供数据支撑,应用于精准输血医学.方法:对433例标本用荧光PCR法进行血型基因检测分析和统计,使血型基...