豆油-苯乙烯共聚物的悬浮制备

采用悬浮聚合法将豆油与苯乙烯进行自由基共聚,制备支化和部分交联的聚合材料。结果表明,豆油与苯乙烯发生了共聚,聚合物中甘油酯基最高摩尔分数达到0.81%,豆油单元的质量分数达到6.50%。聚合温度85.0℃,反应时间4.0h,反应物中悬浮剂（聚乙烯醇）的质量分数0.15%,反应物中豆油的质量分数在10%时,共聚物的分子量达到最大值。共聚物中甘油酯基的含量随着反应物豆油含量的增加而增加。当反应物豆油的质量分数为10%时,凝胶的质量分数达到最大值3.70%。     

大豆收获机车架的轻量化设计

以某大豆收获机的车架为对象,利用三维建模软件Solidworks进行了参数化建模,导入有限元前处理软件Hypermesh对车架进行有限元网格划分和模态仿真分析,对车架样件进行模态试验分析,验证了仿真模型和结果的正确性。对车架不同工况下进行了强度校核计算;以车架固有频率和动载荷系数为2.5时材料的最大许用应力为约束,以车架质量最小为目标,进行了轻量化优化设计,优化后底盘车架减质量16%。     

微波萃取法提取豆渣中大豆异黄酮工艺研究

为优化豆渣中大豆异黄酮的提取工艺,以乙醇为溶剂,采用微波辅助萃取法,选取乙醇浓度、提取温度、微波萃取时间、固液比作为考察条件,结果表明,豆渣中大豆异黄酮的最佳提取工艺为:乙醇体积分数80%,提取温度60℃,微波萃取时间40 min,固液比1∶10～1∶12之间。     

富硒大豆的研究

通过盆栽和田间试验,研究肥料中硒的含量和大豆硒的积累特性.结果表明,施用研制的硒矿粉速效肥,土壤中硒质量分数为2mg kg时,大豆产量高,硒含量也较适宜.大豆中硒的积累与土壤中硒的含量有关,随着土壤中硒含量的增加而递增,但土壤中硒含量过高也会影响大豆的产量.     

南宁市一次严重空气污染期间颗粒污染物特征及气象条件分析

利用南宁市环境保护监测站2010年11月5日至12(污染个案期)在南宁市区振宁花园、市监测点、区农职院、大自然花园4个有代表性的国控环境空气监测点观测到的空气质量数据,分析颗粒污染物PM10和PM2.5的浓度变化及PM2.5的主要化学组分浓度,再利用广西气象服务中心观测的天气数据分析污染个案期的气象条件。结果表明:此次长时间空气污染重,南宁市大气中的颗粒物出现显著升高,颗粒物为此次诱发长时间空气污染物的首要污染因子,颗粒物中的组分以有机质OM和硫酸盐为主;观测时段内气象因素对空气污染存在重要影响,来自湖南方向的污染气团对南宁市的长时间轻微污染也存在一定影响。     

扁茎大豆与栽培大豆营养器官解剖结构比较

利用光学显微摄影技术,比较了两个大豆属植物根、茎、叶和叶柄的解剖结构特征.结果表明:扁茎大豆根内皮层维管形成层带明显,次生木质部导管发达、口径大,且皮层内有菌窝出现;茎的横切面表面积较大,茎中维管束的管孔链数和维管束数目较多,中间髓细胞呈狭长柱形,四周髓细胞发达,体积大、排列紧密.导致扁茎大豆不抗倒伏、光合能力下降以及结实率低的因素可能是:茎的表皮细胞呈方形紧密排列,凯氏带中没有淀粉鞘;叶片只有两层栅栏组织和叶片较薄、海绵组织稀疏;叶柄横切面面积较小.中国普通大豆吉育67叶片有三层栅栏组织,并且海绵组织、栅栏组织和叶片的厚度均明显大于扁茎大豆,有利于植物光合作用;吉育67根的栓质化外皮层发达,对植物体起到了有效的保护作用.     

黑豆皮色素提取方法的研究

目的 探讨黑豆皮色素的最佳提取条件和提取方法。方法 通过实验对黑豆的脱皮、提取溶剂的类型、浓度、料液比及浸提温度、时间、次数、pH值等进行了工艺参数比较及多因素条件下的正交实验，对影响提取率的因素进行了分析。结果 在确定的最佳条件下提取到两种黑豆色素成品，即色素浸膏和干燥的色素粉末。结论 检测数据可靠，提取方法简单合理。     

生物干化污泥衍生燃料流化床焚烧试验研究

在30 k W循环流化床试验了生物干化污泥衍生燃料的焚烧试验;探索衍生燃料焚烧特性及NOX和SO2排放特性。衍生燃料在流化床内具有良好的焚烧特性,燃烧效率达到96%以上,燃尽特性较好;NOX浓度随焚烧温度升高而增大,而分级配风可以有效控制NOX生成;SO2排放浓度受运行条件影响不大,加入石灰石可以有效脱除SO2,脱硫效率达90%以上。     

链状银硫簇合物的合成和晶体结构

选用叔丁硫醇和硝酸银在碱性条件下通过溶剂热反应制得一例新的银-硫配合物晶体[Ag6(μ-St Bu)6]n(1),对其进行X-射线单晶衍射、元素分析表征。结构分析表明1是以6核银Ag6(μ-St Bu)6为簇基结构基元的一维链状簇合物。     

The Siberian Traps and the End-Permian mass extinction: a critical review

The association between the Siberian Traps, the largest continental flood basalt province, and the largest-known mass extinction event at the end of the Permian period, has been strengthened by recently-published high-precision ⁴⁰Ar/³⁹Ar dates from widespread localities across the Siberian province^[1]. We argue that the impact of the volcanism was amplified by the prevailing late Permian environmental conditions―in particular, the hothouse climate, with sluggish oceanic circulation, that was leading to widespread oceanic anoxia. Volcanism released large masses of sulphate aerosols and carbon dioxide, the former triggering short-duration volcanic winters, the latter leading to long-term warming. Whilst the mass of CO₂ released from individual eruptions was small compared with the total mass of carbon in the atmosphere-ocean system, the long ‘mean lifetime’ of atmospheric CO₂, compared with the eruption flux and duration, meant that significant accumulation could occur over periods of 105 years. Compromise of the carbon sequestration systems (by curtailment of photosynthesis, destruction of biomass, and warming and acidification of the oceans) probably led to rapid atmospheric CO₂ build-up, warming, and shallow-water anoxia, leading ultimately to mass extinction.     

高压静电场预处理黄豆对其幼芽生物成分的影响

研究高压静电场预处理对黄豆芽生物成分的影响和不同电场处理条件下黄豆芽组织内抗坏血酸、可溶性蛋白质和总黄酮含量的变化.结果表明,经电场处理过的黄豆芽,3种生物成分与对照组相比均得到显著提高,不同处理条件对不同生物成分产生的生物学效应不尽相同.当电场强度为3～5 kV/cm、处理时间为15 min时,生物学效应最为明显.这表明电场预处理可以提高黄豆芽中抗坏血酸、可溶性蛋白质和总黄酮的含量.     

精馏法催化大豆油裂解制备可再生燃料油

采用自组装的裂解精炼装置,以大豆油为原料考察了精馏反应条件对裂解产物性能的影响。结果表明,最佳反应条件为：精馏柱温度范围320~350 ℃,裂解反应釜温度480~500 ℃,大豆油滴加速度为35 g/h。通过红外光谱（FTIR）、气质联用（GC MS）和凝胶色谱（SEC）对裂解产物的分析表明,产物具有较低的平均分子质量,主要成分为烷烃、烯烃、醛、羧酸等。从化学组成及燃料性能来看,裂解产物的性质与石化柴油相近,裂解所得产物密度825 kg/m3,黏度40 mm2/s,热值42 MJ/kg,冷凝点-9 ℃,冷滤点-4 ℃,具有较好燃料性能。     

大豆硒蛋白药理作用研究

开展了大豆硒蛋白的动物药、毒理实验 ,结果表明 ,大豆硒蛋白能明显增强小鼠抗疲劳能力 ,并能显著增加小鼠免疫器官 (脾脏和胸腺 )的重量。大豆硒蛋白对体外生长的 SP2 /0小鼠骨髓瘤细胞以及对小鼠体内 SP2 /0实体瘤的生长具有明显的抑制和杀伤作用。连续接受高剂量大豆硒蛋白的小鼠在一个月的观察期内无一死亡 ,且均未见到任何异常反应 ,证实了大豆硒蛋白的安全性。     

大豆异黄酮甙元提取工艺的研究

采用先酸水解、后碱水解的方法从大豆中提取游离型大豆异黄酮甙元成分，并通过单因素实验和正交实验确定了碱水解的最佳提取工艺条件．结果表明，碱水解的最佳条件是：pH8．75、温度50℃、提取时间90min，此条件下大豆异黄酮甙元的提取率为44．3％，粗提品纯度为19．9％．     

Re-examining the reliability of tree-ring isotope ratio as a historical CO2 proxy

To examine the reliability of using tree ring δ¹³C and the model of isotopic fractionation in reconstructing atmospheric CO₂ levels, we studied the variations of some important parameters of several subtropical species under natural field conditions. It was found that, different from other researchers’ results, leaf conductance to CO₂ transfer, g, did not change in proportion to the change in rate of CO₂ assimilation, A, with the result that intercellular concen- tration of CO₂, C_i, could not keep constant. Thus, we conclude that the use of tree-ring isotope ratios in the reconstruction of atmospheric CO₂ variation based on the presupposition that C_i keeps constant during assimilation is not reliable under current circumstances.     

大豆磷脂的分析与检测

通过利用纸层析来检测大豆磷脂中的基团,运用薄层层析法对大豆磷脂的各个成分进行分析,并用红外光谱技术对磷脂样品进一步分析。结果表明:纸层析分析表明大豆磷脂水解后,内部含有胆碱、乙醇胺、肌醇和丝氨酸这4种基团,薄层层析检测和红外光谱均表明大豆磷脂中有溶血磷脂酰胆碱、鞘磷脂、磷脂酰胆碱和磷脂酰乙醇胺等。     

高纯大豆磷脂的乳化萃取

以乳化萃取实验方法研究了高纯磷脂的提取，利用最小二乘法建立了数学模型，分析了提取温度、提取时间、搅拌速度、溶质一溶剂用量比、提取次数等影响因素，用确定最佳工艺参数为：转数6000rpm，时间10分钟．磷脂-溶剂比1：5，提取次数4次，所得磷脂纯度为98．8％。     

Seven million-year iron geochemistry record from a thick eolian red clay-loess sequence in Chinese Loess Plateau and the implications for paleomonsoon evolution

Recently, the Tertiary red clay sequence underlying Pleistocene loess has attracted much attention. The remarkable progress is the recognition that the Tertiary red clay sequence is also wind-blown in origin, thus providing a good opportunity to reconstruct long-term monsoon changes. In contrast to the loess deposits, the magnetic susceptibility and the pedogenic characteristics are almost independent of each other in the red clay, thus challenging the validity of the readily measurable magnetic susceptibility in describing the monsoon history recorded by the red clay. With the objective to address the long-term East Asia summer monsoon evolution, the free to total Fe₂O₃ ratios were calculated in a continuous eolian red clay-loess sequence at Lingtai, the Chinese Loess Plateau, which has a thickness of 305 m and a basal age of 7.0 Ma. The seven million-year Fe₂O₃ ratio record from the red clay-loess sequence indicates that (ⅰ) variations of the free to total Fe₂O₃ ratios of the loess can correlate generally with the alternations of the loess and paleosol horizons; (ⅱ) the East Asia summer monsoon was stronger as a whole in Neogene than that in Quaternary; (ⅲ) the strongest East Asia summer monsoon may occur between 4.0 and 4.8 Ma. The relatively small ice volume and high global temperature may be responsible for the strong summer monsoon during the early Pliocene.