平川水地冬小麦钾肥适宜用量试验

分析了在含钾不同的土壤上增施不同量钾肥的试验数据,得出平川水地冬小麦钾肥的适宜用量,并提出了施用钾肥的建议。     

平茬对北方地区巨菌草生长的影响研究

为了了解平茬对北方地区巨菌草的影响,以内蒙古呼和浩特市土默特左旗温室大棚内巨菌草为研究对象,根据巨菌草的生长周期设置了平茬前为对照组,平茬一次后共两种处理方法的实验,分析了平茬前后巨菌草生长状况的变化。结果表明:与未平茬相比,平茬处理后巨菌草的生长速度明显增加,包括株高,叶片数,基部直径;其中分蘖形成的数量也大于未平茬时的分蘖数量;平茬后生物量显著高于未平茬的生物量。可见,平茬处理改变了巨菌草的生长速度、增加了巨菌草的分蘖数量;提高了巨菌草的生物产量。     

板式部件边部UV垂直辊涂机的设计

根据家具板式部件及门扇边部表面为平面的特点及UV辊涂工艺要求,设计开发了板式部件边部UV垂直辊涂机.重点阐述了所设计的UV垂直辊涂机的结构及功能特点.该设备由砂光单元、粉尘清扫单元、垂直辊涂单元及干燥单元等构成,可一次完成板式部件边部砂光、粉尘清扫、油漆及干燥4道工序,提高了边部油漆效率,减少了涂料浪费和环境污染.     

Predicting the effect of fresh gas flow on tidal volume in volume-controlled mechanically ventilated dogs

ObjectivesTo determine if the tidal volume (V_T) delivered (V_TDEL) to canine patients being mechanically ventilated by a volume-controlled ventilator differed from the volume set on the ventilator (V_TSET) at three fresh gas flow (FGF) rates. To determine if V_TDEL could be accurately predicted by an FGF-based mathematical model.Study designProspective proof-of-concept study.AnimalsA total of 23 adult client-owned dogs undergoing elective orthopedic surgery.MethodsDogs were anesthetized and ventilated with a volume-controlled mechanical ventilator with constant respiratory rate (f_R) of 10 breaths minute^–1, inspiratory-to-expiratory ratio of 1:2 [fraction of inspiratory time (T_I) in one respiratory cycle (T_tot) 1:3], and V_TSET as body weight (kg) × 15 (mL kg^–1). V_TDEL was measured in 20 dogs at three FGF (500, 1000 and 4000 mL minute^–1). A mathematical model was used to calculate predicted volume (V_TPRED) for each animal at each FGF: V_TSET + {FGF × [(T_I/T_tot)/f_R]}. Linear repeated measures models were fit comparing V_TDEL to V_TSET and to V_TPRED by FGF.ResultsV_TDEL was significantly higher than V_TSET at every FGF (p < 0.05), and differences were larger at higher FGF (p < 0.001). There were no statistically significant differences between V_TDEL and V_TPRED at FGF rates of 500 and 4000 mL minute^–1 and, although the mean V_TDEL was statistically significantly higher than V_TPRED at FGF 1000 mL minute^–1 (p = 0.017), the mean difference of 9 mL was not clinically significant.Conclusions and clinical relevanceDogs on volume-controlled ventilators may be ventilated at a higher V_TDEL than intended depending on the FGF settings. Ventilation of small animals at high FGF could inadvertently induce pulmonary damage. A mathematical equation can be used to achieve a desired V_TDEL by adjusting V_TSET values based on FGF, f_R and T_I/T_tot.     

Drag force due to vegetation in mangrove swamps

Field studies of tidal flows in largely pristine mangrove swamps suggestthat the momentum equation simplifies to a balance between the water surfaceslope and the drag force. The controlling parameter is the vegetation lengthscale L_E, which is a function of the projected area ofmangrove vegetation and the volume of the vegetation. The value ofL_E varies greatly with mangrove species and water depth. It isfound that the drag coefficient is related to the Reynolds number Re definedusing L_E. The drag coefficient decreases with increasingvalues of Re from a maximum value of 10 at low value of Re (<10⁴), and converges towards 0.4 for Re < 5 ×10⁴.     

Manganese dynamics in a mangrove mud flat tidal creek in SE Brazil

This study investigated the behavior of soluble and particulate manganese, during tidal cycles in a mangrove tidal creek and adjacent mud flats in SE Brazil. We identify the major processes affecting manganese transport to mangroves. The results showed that manganese variability occurs both seasonally, and over the tidal cycle, in response to changing redox potentials. Tidal water flooding mud flats are enriched in manganese, originating from upward migration of reduced species and further adsorption onto suspended particles under oxic conditions. During the tidal cycle, particulate manganese concentrations are higher during flood periods, whilst dissolved concentrations are higher during ebb periods. Although quantitatively different, this pattern occurs both in winter and summer. The dynamics of manganese characterized in this study suggest that this metal may play a significant role as a conveyor of trace metals to mangrove ecosystems, as suggested by earlier studies.     

谷物冷却技术处理浅圆仓发热玉米的生产性试验

浅圆仓储粮在国内已初具规模，总的仓容量达到100亿斤，但是与之配套的浅圆仓储粮技术却很不成熟，尤其是储藏中一些应急处理技术更加缺乏，也正是这些因素阻碍了浅圆仓储粮技术的推广与应用。本文对应用谷冷技术应急处理浅圆仓散装玉米局部发热问题进行了详尽的阐述和分析，并将共同机械倒仓作了客观综合比较，肯定了谷冷技术在应急处理浅圆仓粮食发热问题中的效能，从而为浅圆仓储粮的进一步推广应用起到推动作用。     

九味中药及其复方对奶牛乳房炎病原菌的体外抑菌试验

针对导致奶牛乳房炎的主要病原菌(大肠埃希菌、葡萄球菌、链球菌),用平板法测定了9味中药和4种复方中药的体外抑菌效果。结果表明,方剂1及方剂2的综合效果较好,对于葡萄球菌以黄芩、黄连、红花、鱼腥草的抑菌效果明显,对大肠埃希菌以黄芩、鱼腥草、蒲公英和黄连的效果好。为防治奶牛乳房炎的中药配方科学筛选提供了理论依据。     

浒苔绿潮的发生、危害及防治对策

本文就浒苔绿潮的发生、危害进行了探讨与分析,并提出了预防、治理和综合利用等方面的建议与对策。     

崇明东滩不同演替阶段湿地土壤有机碳汇聚能力的差异性及其微生物机制

旨在阐明崇明东滩不同演替阶段湿地土壤有机碳汇聚能力的差异性及其机制,以期为优化湿地的管理与保育措施,进而保持和提升湿地的碳汇功能提供理论指导和决策依据。研究结果表明,4个不同演替阶段湿地土壤有机碳含量和微生物呼吸强度有显著差异(P<0.05),中高潮滩处的土壤有机碳汇聚能力最高,这是由于其具有较高的有机碳输入(植物枯落物)和相对较低的碳输出(土壤呼吸)。PCR-DGGE分析和系统进化树结果表明,4个不同演替阶段土壤的微生物群落结构存在差异,一些特异性优势菌的存在可能是影响土壤微生物呼吸强度,并最终影响土壤有机碳汇聚能力的重要原因。出现在高潮滩的噬纤维菌和假单胞属菌具有较高降解纤维素等有机质的能力,它们的存在可能强化了高潮滩的土壤呼吸作用,从而降低了高潮滩土壤的有机碳汇聚能力。