基于单片机ATmega8与ADS1244的数据采集

本文介绍一种基于ATmega8与ADS1244的数据采集系统。内容包括单片机ATmega8和ADS1244的特点,并详细阐述了数据采集系统中ATmega8和ADS1244的接口技术,包括硬件和软件技术。     

DS6-K5B计算机联锁系统PIO板调试常见故障分析

介绍DS6-K5B计算机联锁系统PIO板的组成和功能,并针对该PIO板调试中发现的常见故障现象,进行原因分析,提出故障排除的方法。     

双环汽车数字组合仪表设计

根据汽车仪表的数字化发展趋势，针对双环集团某款轿车，以瑞萨H8S汽车仪表专用单片机为核心，选用优质元器件，设计出符合国家、行业标准和主机厂要求的数字组合仪表。仪表软件开发的过程中充分考虑到汽车使用的各种具体情况，并采用软件工程的标准开发流程，达到系统工作的高可靠性。该款仪表目前已通过各项试验。进入批产状态。     

THE EFFECTS OF POLYAMINE ANALOGUES AND POLYAMINE TOXIN ON EXPRESSED KIR 2.1 CHANNEL

Inward rectifying potassium channels(Kir)are presentin a wide variety of cell types,includingmuscles,neurons,eggs and endothelial cells.Theyconduct cations more easily in the inward directionthan in the outward direction,and this property isimportant for maintaining the resting membranepotential near the K equilibrium potential (Ek) ,and for permitting long depolarizing responses[1,2 ] .The property of strong inward rectifier K channel(Kir2 .1 ) has been previously attributed to intra-cellul…     

THE RELATIONSHIP BETWEEN INTERLEUKIN-6,INTERLEUKIN-8 CONCENTRATIONS AND INTRAAMNIO INFECTION AND APGAR SCORES

PROMisoneofthecommoncomplicationsofpregnancyanditsrateis10%to20%ofdelivery">.TherehavebeenanumberofresearchesaboutPROMinrecent10yearsandtheyallshowedthattherewasacloserelationshipbetweenPROMandinfectionc2.33.AhighpercentageofthewomenwithPROMhaveeitherclinicalevidentchorioamnionitisorevidenceofasubclinicalinfection'3,.BOthPROMandIAIincreasedthePerinatalmorbidityandmortility,'...',.Manyexter-nalbutnointernalinvestigatorshavedonealotandfoundthattherewererelatinnsbipsbetweenIL--l.IL--6…     

腹部手术围手术期应用乌司他丁的作用及其机制

目的　探讨围手术期应用乌司他丁减少手术对机体损伤的作用及其机制。方法　腹部手术患者 2 0例为实验组 ,2 0例为对照组 ,检测两组术前 1d ,术后 1、3、5d血清TNF α、IL 6、IL 8、BUN及血肌酐 ,并观察两组患者术后体温及白细胞计数恢复正常的时间。结果　研究组与对照组相比较 :①术后TNF α、IL 6和IL 8研究组明显低于对照组(P <0 .0 5 ) ;②术后血肌酐研究组明显低于对照组 (P <0 .0 5 ) ;③术后第 1天和第 3天体温研究组明显低于对照组 (P<0 .0 5 ) ;④白细胞计数术后第 3天研究组明显低于对照组 (P <0 .0 5 )。结论　围手术期应用乌司他丁可通过抑制炎症反应防御组织损伤。     

褪黑素与免疫调节细胞的关系

目的　探讨褪黑素与免疫调节细胞之间的关系。方法　采用流式细胞计数测定外周血T淋巴细胞亚群CD4+和CD8+T细胞的百分含量、比值。结果　褪黑素可提高外周血中CD4+和CD8+T细胞的百分含量 ,调整CD4+/CD8+比值。结论　褪黑素可通过调整免疫调节细胞TH/TS 的比例发挥免疫调节作用。     

8000kW救助船规则波下的运动与波浪载荷预报

随着数值计算技术的发展,船舶运动与波浪载荷预报精度也在不断提高。介绍了三维势流理论方法在规则波上船舶运动与波浪载荷预报中的应用,以8 000 k W救助船为例,预报了其运动与波浪载荷。通过应用三维势流理论,可以为船舶耐波性评估和结构设计提供依据。     

Monte Carlo simulation of electron swarms parameters in c-C4F8/CF4 gas mixtures

The swarm parametes for c-C₄F₈/CF₄ mixtures, including the density-normalized effective ionization coefficient, drift velocity and mean energy were calculated using Monte-Carlo method with the null collision technique. The overall density-reduced electric field strength could be varied between 150 and 500 Td, while the c-C₄F₈ content in gas mixtures is varied in the range of 0–100%. The value of the density-normalized effective ionization coefficient shows a strong dependence on the c-C₄F₈ content, becoming more electronegative as the content of c-C₄F₈ is increased. The drift velocity of c-C₄F₈/CF₄ mixtures is more affected by CF₄. The calculated limiting field strength for c-C₄F₈/CF₄ mixtures is higher than that of SF₆/CF₄. Foundation item: the National Natural Science Foundation of China (No. 50777041)     

Measurement of swarm parameters of c-C4F8/CO2 and its insulation characteristics analysis

In c-C₄F₈ and c-C₄F₈/CO₂ mixtures, the swarm parameters including ionization coefficient, attachment coefficient and effective ionization coefficient were obtained at the ratio of the electric field strength to the gas density between 150–550 Td by the steady-state Townsend (SST) method. Static breakdown voltages at each ratio were also measured at the SST condition. The limiting field strengths were obtained by two methods: computing the density-normalized effective ionization coefficient as a function of the overall density-reduced electric field strength; and measuring static breakdown voltages as a function of the product of gas density and electrode separation. Good agreement was obtained by these two methods, which ensures the correctness of the former method. The limiting field strengths of c-C₄F₈ and c-C₄F₈/CO₂ mixtures were compared with those of pure SF₆, SF₆/CO₂ mixtures and pure c-C₄F₈. It is found that buffer gas CO₂ does not reduce the limiting field strengths of c-C₄F₈ greatly, the limiting field strengths of c-C₄F₈/CO₂ mixtures are higher than those of SF₆/CO₂ mixtures or even pure SF₆, and so c-C₄F₈/CO₂ mixtures are suggested to be possible substitutes for SF₆. Foundation item: the National Natural Science Foundation of China (No. 50777041)