中间罐尾气回收装置的运行及其改进措施

针对金陵分公司油品储运部中间罐区储存含有H2S粗汽油、粗柴油中间料挥发外泄带来的环境问题,采用抚顺石化研究院开发的“液态吸收”法对中间储罐排出的含硫、含烃尾气进行有效吸收:经冷冻的粗柴油作为贫吸收油,吸收尾气中的烃类组分,再经30％碱液重力反应器吸收含硫物质,尾气经上述处理过程后实现达标排放.通过对运行中存在的系统压力、吸收剂温度、碱液浓度等问题进行分析,提出了相关改进措施.改进后的装置运行稳定,连续尾气吸收效果较好.     

贵州普安县优质富硒茶及土壤环境调查

为促进普安县优质茶产业发展,对该县优质茶叶及产地土壤环境进行了调查。结果表明:贵州普安县精细加工的春茶品质优良,普安茶场的春茶中硒元素含量为0.28～0.33mg/kg,达国家富硒茶标准;该茶场分布于二叠系上统龙潭组(P3l)地层之上,茶园土壤硒含量达0.59～3.07mg/kg,属富硒～高硒土壤。该县在类似地质环境与土壤条件的地区发展优质富硒茶叶生产,具有很大的潜力。     

JDDY型粮油滴定分析仪在稻谷玉米脂肪酸值测定中的应用

采用基于机器视觉技术的JDDY型粮油滴定分析仪代替人工滴定进行稻谷、玉米脂肪酸值的测定.通过添加亚油酸标准溶液测定稻谷、玉米脂肪酸值的回收率,验证采用滴定仪测定稻谷、玉米脂肪酸值的准确性.实验结果表明,稻谷回收率在99.5％～107.3％之间,玉米回收率在96.1％～105.7％之间,滴定仪对稻谷、玉米的测试值与理论添加值之间具有较好的相关性,线性相关系数分别为r=0.9993,r=1.0000,具有较宽的测量范围,能够满足目前稻谷、玉米试样脂肪酸值指标的品质检验要求.     

底泥中多环芳烃的测定

介绍运用微波萃取提取底泥中多环芳烃的技术,在优化的试验条件下,采用气象色谱—质谱法测定底泥中的16种多环芳烃,运用加标回收率验证试验方法的可行性。结果表明:采用微波消解和硅胶净化柱对样品进行前处理,方法简便,安全,样品量大,耗时短,节省溶剂,污染小,样品加标回收率为67.353%～101.666%,效果较为理想。     

水稻苗期抗旱性的关联分析(英文)

[目的]此研究旨在检测水稻苗期抗旱性的数量性状位点。[方法]通过对 184 份水稻品种的田间苗期抗旱性鉴定,同时利用每 3Mb 为一区间随机分布于水稻 12 条染色体上的 156 个 SSR 标记子对卷叶、枯叶及复水恢复率 3 个苗期抗旱性性状进行标记,通过关联分析检测此 3 个性状的数量性状位点。[结果]水稻品种对苗期干旱具有不同的反应,卷叶、枯叶及复水恢复率这3个性状具有显著的相关性,对该群体在群体结构K=3 和 K=7 时进行了分析。[结果]该组水稻品种存在一定程度的遗传混杂,品种间的相互遗传相关性范围从 0 到 0.924 5。SSR 标记子间存在着明显的连锁不平衡。该试验共检测到与苗期抗旱性关联的16个SSR标记子,其中4个与卷叶性状,8个与枯叶性状,4个于复水恢复率紧密关联,而且大多数的标记子与2个以上的性状关联,表明某个单一抗性机理可能与多个不同性状的表达相关,如:渗透势调节。位于第九染色体上的RM107 标记子与所有 3 个苗期抗旱性性状关联,并且位于以前研究所报道的区间之内,为苗期抗旱性的主要位点,位于第八染色体上的 RM477与复水恢复率显著关联,且与卷叶性状的关联达到极显著水平,该位点可能是苗期抗旱性的另一个主要数量性状位点。[结论]关联分析是用于分析复杂性状(如抗旱性)非常有效的方法。     

杜仲叶提取物对力竭运动及恢复小鼠肝脏和骨骼肌的保护作用

[目的]研究杜仲叶提取物对力竭运动及恢复小鼠肝脏、股四头肌中SOD、POD、MDA和血清中AST、ALT、AKP活性的影响。[方法]取72只ICR小鼠,随机分为安静对照组A、安静杜仲叶提取物组B、力竭运动对照组C、力竭运动杜仲叶提取物组D、力竭运动恢复对照组E和力竭运动恢复杜仲叶提取物组F,每组12只,各给药组小鼠每日按1.5 g/kg剂量以杜仲叶提取物灌胃,各对照组小鼠以蒸馏水灌胃,连续30 d后,将运动组小鼠置于水中游泳至力竭,记录力竭运动时间;C组和D组小鼠运动后即刻摘眼球采血,并取肝脏和股四头肌备用。A组和B组不作运动处理,直接摘眼球采血,并取肝脏、股四头肌备用。E组和F组小鼠恢复24 h后摘眼球采血,并取肝脏、股四头肌备用;测定小鼠肝脏、股四头肌MDA含量、SOD和POD活性及血清中AST、ALT和AKP活性。[结果]杜仲叶提取物可以提高力竭运动状态下小鼠肝脏和股四头肌中SOD和POD活性,减少MDA生成,并可明显降低血液中AST、ALT和AKP的活性。[结论]杜仲叶提取物对力竭运动小鼠的肝脏和骨骼肌有保护作用,并具有促进机体恢复的作用。     

Influence of Backfill Air Gap on Soil Temperature Recovery in Ground coupled Heat Pumps

Air gap may easily emerge in the progress of backfill in ground heat exchange due to field operation problems. The single U tube three dimensional numerical heat transfer model is set up and there are 3 kinds of backfill air gap assumptions for computational analysis, which are the most common situations in practical projects. Different air gap situations will have considerable effects on soil heat transfer, especially the factor of soil temperature recovery performance, which is investigated in this research, and there is practical project operating data for the comparison confirmation with the theoretical calculation results in inlet and outlet water temperatures. It can be concluded that the backfill air gap will increase the soil average excess temperature in the period of recovery inside the place where the air gap is, and degrade the heat transfer performance of the ground heat exchange.     

Nitrogen-15 Uptake by Pinus contorta Seedlings in Relation to Phenological Stage and Season

This study measured the amount of uptake of labeled nitrogen (¹⁵N) of lodgepole pine (Pinus contorta Dougl. var. latifolia Engelm) seedlings, at three different phenological stages, in a growth chamber experiment. Thirty days after ¹⁵N application, the amount of ¹⁵N recovered in seedlings as a percentage of the total ¹⁵N fertilizer applied was 4% in early spring, 43% in summer and 33% in autumn. The total ¹⁵N recovered in the plant–pot system ranged from 80 to 96%, and is higher than reported in other studies. Total ¹⁵N recovered from the pot compartment alone ranged from 48 to 95%, suggesting that substantial pools of N remain in the soil. Results suggest that low ¹⁵N uptake in the spring was associated with limited development of new root as a result of low spring soil temperatures. The lack of unsuberized roots in spring could be a key factor decreasing the effectiveness of early spring fertilization in the boreal forest.     

Comparison of two harvesting systems for the production of forest biomass from the thinning of Picea abies plantations

Abstract

This study compares two principally different harvesting systems used for the thinning of Norway spruce [Picea abies (L.) Karst.] plantations in the Alps. The first system was whole-tree harvesting (WTH), producing only whole-tree chips for energy purposes. This system minimizes the production costs by simplifying the harvesting process. The other system was cut-to-length (CTL) mechanical harvesting with an excavator-based harvester. This system maximizes value recovery by producing both short sawlogs and quality fuel chips. Trials were conducted on two similar sites in the Dolomites, in northern Italy, and demonstrated that the CTL system resulted in slightly higher harvesting costs, and also higher revenue. The price differences between the different products determine which system offers the best economic results. If the delivered price of sawlogs does not exceed [euro]25 t^?1, WTH and CTL harvesting offer very similar economic performances, and become profitable only if the delivered price of raw chip wood exceeds [euro]40 t^?1. If the delivered price of sawlogs increases to [euro]50 t^?1, the mechanized CTL system always becomes preferable, and it will turn some profits when the price of raw biomass exceeds [euro]35 t^?1. The CTL system is less sensitive to long extraction and transport distances than the WTH system.     

常规干燥室余热回收装置的研究

分析研究具有强制集中换气木材干燥室的余热回收装置,并对其节能效果进行测试分析。对不同干燥阶段测试结果表明,从干燥室排出的通过余热回收装置后温度下降了13～16.3℃,补充到干燥室中的新鲜空气通过余热回收装置温度可以升高9～11.9℃。此余热回收装置的热回收效率为18.6%～28%,平均效率为22%,理论计算常规干燥每1m3、47mm厚的水曲柳的总排湿能量为1.4×106kJ,用该装置可节省热能为2.88×105kJ,相当于节省标准煤9.84kg。