低压电力线载波通信的集散控制数据交换研究

低压电力线载波通信的集散控制数据交换平台,由若干集散控制接口单元组成,集散控制接口单元具有低压电力线载波通信功能及RS485总线通信功能,集散控制接口单元之间利用PL2102实现低压电力线载波通信,通过低压电力线完成上位机和下位机之间的数据交换.     

四川省主要杂交稻品种抗瘟性评价

"八五"以来,四川省培育出了一批新的杂交稻抗病丰产品种,及时更换了已丧失抗病性的主栽品种汕优63,使四川省结束了品种单一化种植的局面,控制了稻瘟病的大发生、大流行,确保了我省水稻持续高产稳产.1997年,我们对四川省主栽水稻品种和新育成品种的抗瘟性进行了系统评价,以期为这些品种的推广利用和合理布局提供科学依据.     

施肥量和施肥方式对人工混播草地产草量的影响

采用裂区试验设计探讨了施肥量和施肥方式两个因素对以苇状羊茅、多年生黑麦草为主的人工混播草地产草量的影响,结果表明:随着施肥量增加,鲜草产量明显提高,不同施肥量处理间产量差异达极显著水平(P<0.01);随着基肥比例的增大,追肥比例的减少,鲜草产量反而降低,不同基肥比例处理间产量差异也达极显著水平(P<0.01).另外,相同氮肥量条件下3种施用方式处理与相应的鲜草产量间都成直线关系(r5:5=0.9771**,r6:4=0.9630**,r7:3=0.9643**).     

Interleukin-1β inhibits AKT to down-regulate eNOS Ser1177 phosphorylation in human umbilical vein endothelial cells

AIM To investigate whether interleukin-1β （IL-1β） regulates endothelial nitric oxide synthase （eNOS） phosphorylation at Ser1177 site in human umbilical vein endothelial cells （HUVECs）， and to explore its possible mechanism. METHODS The HUVECs were randomly divided into normal control group， tumor necrosis factor-α （TNF-α） group， IL-1β group， IL-6 group， SC79 ［protein kinase B （PKB/AKT） specific agonist］ group and SC79+IL-1β group. Western blot was used to determine the protein levels of eNOS， p-eNOS-Ser1177， AKT and p-AKT-Ser473 in the HUVECs. Chemical colorimetry was used to detect the nitric oxide （NO） content in the culture medium of HUVECs. RESULTS No statistically significant difference of p-eNOS-Ser1177 level in HUVECs treated with TNF-α and IL-6 was observed as compared with normal control group （P>0.05）， while the protein level of p-eNOS-Ser1177 in the HUVECs and the content of NO in the culture medium of HUVECs decreased significantly in IL-1β group （P<0.05）， and the protein level of p-AKT-Ser473 in the HUVECs was decreased as compared with normal control group （P<0.05）. The AKT agonist SC79 blocked the down-regulation effect of IL-1β on p-eNOS-Ser1177 level in the HUVECs and NO content in the culture medium of HUVECs （P<0.05）. CONCLUSION IL-1β down-regulates the protein level of p-eNOS-Ser1177 in HUVECs and affects the activity of eNOS， which may be involved in AKT/eNOS signaling pathway.     

Role of leukotriene D4 in promoting proliferation of cultured human airway smooth muscle cells

AIM: To investigate whether leukotriene D₄(LTD₄) would stimulates proliferation of cultured human airway smooth muscle (ASMC). METHOD: Human ASMC were isolated and subcultured, varying concentration of LTD₄ were added to the media. Cell counts were obtained, -thymidine([³H]-TdR) incorporation and inositol 1, 4, 5-trisphosphate (IP₃) accumulation were measured. RESULTS: LTD₄(0.1nmol·L^-1~10 nmol·L^-1) increased cell number and also increased incorporation of[³H]-TdR and accumulation of IP₃ in a concentration dependent manner(P＜0.01). The latter response was blocked by phospholipase C inhibition with neomycin (1 μmoL·L^-1(P＜0.01). However, neomycin had no effect on the promitogenic action of LTD₄. CONCLUSION: LTD₄ stimulates proliferation of cultured human ASMC and may play a role in airway remodeling of asthma.     

木质养殖船的稳性衡准

针对木质养殖船无建造规范可进行稳性衡准,对大连市庄河、长海县、普兰店、开发区部分养殖船进行实船测绘,并对163艘养殖船资料进行了统计与分析,从中总结出适合大连地区木质养殖船的稳性衡准计算方法.     

论Trips协议下我国报刊社之版权及有关权

报刊社作为重要的传播者,在传播作品的过程中,所享有的权利主要分为著作权与邻接权。根据Trips协议的有关规定,我国近几年来对版权法律制度进行了一系列的修改。本文对报刊社在现行版权法中的权利做了详细的分析,并指出报刊社的转载权与Trips协议的精神不符及相应的立法建议。     

Analysis of leaf wetness in the rice crop caused by dew formation—a simulation study1

Daily dew amount and dew duration were simulated using a multi-layer energy balance model. Two simplifications were made in the model and validated. First, the simulation results showed that daily weather data instead of hourly weather data could be used to simulate dew formation in crops, which was validated by measurements for short grass vegetation. Second, estimation of the total daily dew period was shown to be possible on the basis of nightly dew formation only. This simplification was possible on the basis of the existence of a linear relationship between the dew period after sunrise on the one hand and the dew amount at sunrise on the other. The multi-layer crop microweather model becomes much smaller and simpler (and is then called the SIMPLE model) if only night dew formation is simulated. Our results will make it possible to incorporate the SIMPLE model into a fungal disease epidemic model and a basic crop growth model.