Application of PLC in Hydraulic Power Sliding Table Control System

阐述了液压动力滑台的工作原理及可编程序控制器(PLC)在控制系统中的应用、PLC控制的硬件结构和程序设计。The application of PLC in the hydraulic power sliding table control system was introduced and its principles, the hardware structure and the procedure design were discussed

Analysis on death causes of liver cancer of inhabitants in Xiamen City from 2002 to 2011

目的了解2002-2011年厦门市居民肝癌死亡趋势、分布特征及寿命损失情况。方法对2002-2011年厦门市肝癌死亡登记资料和人口数据进行统计分析,通过计算死亡率、标化死亡率、年均增长死亡率及寿命损失年等指标,评价居民的肝癌死亡及寿命损失情况。结果 2002-2011年厦门市肝癌年均死亡率为32.70/10万,标化死亡率为34.48/10万,居恶性肿瘤死亡顺位第1位,总体趋势有下降,但差异无统计学意义(2趋势=2.13,P=0.144)。男性、女性、城区、郊区、农村的肝癌年均死亡率均呈下降趋势,但只有郊区下降有统计学意义(2趋势=7.46,P=0.006)。肝癌死亡率比较:农村>城区>郊区,男性死亡率高于女性,差异有统计学意义(2=1 758.80,P<0.001)。肝癌主要危害中老年人群,死亡年龄的中位数为57岁,89.37%的死亡病例发生在40岁以上人群。肝癌潜在寿命损失年为93 378.0人年,平均减寿年数为20.17人年,减寿率为5.74‰,男性和农村居民寿命损失较严重。结论 2002-2011年厦门市肝癌死亡率整体呈下降趋势,但对中老年人群的危害仍很严重,应继续加强防控力度。Objective To gain the knowledge of trends in mortality,distribution characteristics and potential years of life lost caused by liver cancer among Xiamen population from 2002 to 2011.Methods Mortality rate,standardized mortality rate,average annual growth rate of mortality and years of life lost have been employed to evaluate the mortality of liver cancer and years of life lost caused by the disease among population in Xiamen.Results The average annual mortality rate of liver cancer among Xiamen population was 32.70 /105.After the standardization,the rate was ascended to 34.48 /105,ranking in the top of the death causes.Compared to historical data,the mortality rate slightly decreased in total.However,no statistical significance was observed.The average annual mortality rate of male,female,urban,suburban and rural areas were decreased,but only a statistically significant decrease in the suburban was noted.As for the locations,the mortality rate in rural area was the highest,and that of urban area maintained in the second position,and the rate of suburb area was the lowest in Xiamen.The reduction on the average mortality rate among female population was greater than that of its counterparts.We also observed that the reduction was greater in rural areas than in the rest of city.However,the differences were not statistically significant.Liver cancer mainly affected the middle-aged and old population,and the median of death age was 57 years old.Furthermore,89.37% of deaths were reported in the population older than 40 of years.The potential years of life lost caused by liver cancer among Xiamen population was 93 378.0 PY and AYLL was 20.17 PY,and PYLL rate reached 5.74‰.The years of life lost caused by liver cancer among male and rural population are serious.Conclusions The mortality rate of live cancer among Xiamen population between 2002 and 2011 has been declined in general aspect.However,the liver cancer still renders great threat to the health among middle-aged and old population.Therefore,the prevention and control strategy should be further promoted.福建省卫生厅青年科研课题(2010-2-113

灰绿曲霉产纤维素酶的研究

灰绿曲霉(Aspergillus glaucus)发酵液通过硫酸铵盐析、Sephadex G-100分子筛、DEAE Sepharose Fast Flow离子交换柱和Phenyl Sepharose Fast Flow疏水层析,分离纯化一种外切葡聚糖酶(CBH)和一种内切葡聚糖酶(EG).通过SDS-PAGE和凝胶柱层析法测定分子质量表明:CBH全酶分子质量为71 ku,由两个分子质量为35 ku的同型亚基组成;EG为单体蛋白,全酶分子质量为32 ku.酶学性质研究表明:CBH催化pNPC的最适pH为6.0,最适温度为55℃,酶活在pH 5.0~8.0区间和温度低于55℃时稳定;EG催化CMC-Na的最适pH为4.0,最适温度为50℃,酶活在pH3.5~7.5区间和温度低于65℃时稳定.Na+、K+、Ba2+、Mg2+以及NO3-和SO42-对CBH和EG酶活均无影响;Ca2+和Mn2+对CBH有激活作用,Fe2+和Mn2+对EG有激活作用,而Zn2+、Cd2+和Cu2+对CBH和EG均有不同程度的抑制效应.酶动力学分析表明:CBH催化pNPC水解的米氏常数Km值为1.4 mmol/L(pH 6.0,55℃),EG催化CMC-Na水解的米氏常数Km值为5.0 mg/mL(pH 4.0,50℃)

乌鳢一个养殖群体中性别连锁AFLP标记的筛选

许多经济鱼类的雌雄个体生长和成体规格存在明显的差异，性别控制在这些鱼中往往能产生很高的经济效益吧例如全雌鲤鱼的培育和全雄罗非鱼的培育。最近，在全雄黄颡鱼的培育方面，我们实验室开发出了若干与黄颡鱼性染色体相连锁的DNA标记

乌鳢一个养殖群体中性别连锁AFLP标记的筛选

许多经济鱼类的雌雄个体生长和成体规格存在明显的差异，性别控制在这些鱼中往往能产生很高的经济效益吧例如全雌鲤鱼的培育和全雄罗非鱼的培育。最近，在全雄黄颡鱼的培育方面，我们实验室开发出了若干与黄颡鱼性染色体相连锁的DNA标记

锂离子电池正极材料层状LiNi1/2Mn1/2O2的制备与表征

用一种简单的共沉淀法制备出了层状LiNi1/2Mn1/2O2材料，并且用XRD、SEM、循环充放电、循环伏安(CV)和电化学阻抗谱(EIS)等方法对材料进行了表征测试。首先，用共沉淀法制备氢氧化镍和氢氧化锰的混合物：然后,对共沉淀溶液进行预氧化来制备前驱体；最后，用预氧化的前驱体合成了LiNi1/2Mn1/2O2材料。SEM 和XRD测试结果分别表明：LiNi1/2Mn1/2O2材料是粒径范围在100～200 nm之间的球形粒子，并且具有非常好的层状结构。循环充放电表明：在空气中900℃下合成时间为9 h的材料．在充放电截止电压为2.8～4.6 V的情况下，经过40次循环，材料的容量可以稳定地保持在140 mAh．g-1左右。循环伏安曲线表明：在锂的初始脱嵌和入嵌过程中存在不可逆相变。电化学阻抗谱测试表明LiNi1/2Mn1/2O2具有很好的锂离子扩散能力

磁控溅射制备WC涂层的结构及其水环境中的摩擦学行为

采用磁控溅射技术在304不锈钢基体上沉积制备WC涂层,为提高涂层的结合强度,不锈钢基体和WC涂层之间沉积Cr过渡层.WC涂层致密光滑,呈柱状晶特征,总厚度为2μm.不锈钢钢表面沉积的WC涂层硬度达到34 GPa,结合强度超过70 N.与不锈钢基体和碳化物块体材料相比,WC涂层在干摩擦,去离子水和海水环境中均具有最佳的耐磨减摩性能.WC涂层磨损机制在干摩擦和去离子水中主要为磨粒磨损,海水环境中磨损以粘着磨损为主

synthesis and characterization of layered lini1/2mn1/2o2 as cathode material for lithium ion batteries

用一种简单的共沉淀法制备出了层状LiNi1/2Mn1/2O2材料,并且用XRD、SEM、循环充放电、循环伏安(CV)和电化学阻抗谱(EIS)等方法对材料进行了表征测试.首先,用共沉淀法制备氢氧化镍和氢氧化锰的混合物;然后,对共沉淀溶液进行预氧化来制备前驱体;最后,用预氧化的前驱体合成了LiNi1/2Mn1/2O2材料.SEM和XRD测试结果分别表明:LiNi1/2Mn1/2O2材料是粒径范围在100～200 nm之间的球形粒子,并且具有非常好的层状结构.循环充放电表明:在空气中900℃下合成时间为9 h的材料,在充放电截止电压为2.8～4.6 V的情况下,经过40次循环,材料的容量可以稳定地保持在140 mAh·g-1左右.循环伏安曲线表明:在锂的初始脱嵌和入嵌过程中存在不可逆相变.电化学阻抗谱测试表明LiNi1/2Mn1/2O2具有很好的锂离子扩散能力