甲醛缩合法快速测定缩合单宁含量的研究

本文利用甲醛缩合法测定了兴安落叶松缩合单宁的含量,通过与皮粉振荡法的结果比较,验证了甲醛缩合法的可行性,是一种快速简便的检验缩合单宁含量的测试方法。     

RFG—DMR降烯烃催化剂在重油催化裂化装置上的工业应用

介绍了东明石化集团Ⅱ套重油催化裂化装置使用RFG—DMR降烯烃催化剂的情况。该催化剂占系统藏量83％时进行的标定结果表明：该剂降低汽油烯烃含量效果比较明显。汽油烯烃体积分数由48．56％降到39．72％．下降了8．84％。汽油辛烷值没有降低。产品分布得到改善。重油裂化能力强。于气和焦炭选择性好。轻质油收率增加了1．07％，总液体收率增加了1．56％。     

高亲水性有色隐形眼镜的紫外合成与表征

以当前研究较多的甲基丙烯酸β羟乙酯(HEMA)、N乙烯基α吡咯烷酮(NVP)为单体(质量比1∶1),安息香乙醚(BEE)为引发剂(1%,质量分数),透明蓝为色料,利用紫外光引发自由基反应,合成了有色隐形眼镜。红外光谱定性说明单体参与了聚合反应,色料质量分数为2.46×10-5时,镜片浸出液pH与人体泪液接近,平均透光率达到97%以上,含水率为66.51%,抗张强度为916.26 Pa(湿态)。扫描电镜下观察到均匀交织的网状结构,进一步证明了镜片的高含水率、高透氧率、高抗张强度。     

α-纤维素膜气体分离性能

制备了α-纤维素膜并对其气体分离性能进行了研究.测定了水溶胀下，CO₂、H₂、CH₄、N₂、O₂等气体在α-纤维素膜内的气体渗透速率.通过比较研究醋酸纤维素膜、苯甲酰化纤维素膜和聚砜膜在干态和湿态下的气体渗透性能，揭示了水对α-纤维素膜气体渗透性能的作用规律.     

氯乙烯气柜的安全运行

介绍了氯乙烯气柜的结构、工作原理以及在生产中的作用,分析了气柜运行存在的安全风险和控制措施,并对气柜是否取消提出了建议。     

New sesquiterpenes fromMaytenus species (Celastraceae). Taxonomic and chemotaxonomic considerations concerning chileanMaytenus

Three new dihydro-content/lg4402v635942486/xxlarge946.gif" alt="beta" align="MIDDLE" BORDER="0">-agarofuran sesquiterpenes from two species ofMaytenus were isolated and their structures were elucidated by means of¹H and¹³C NMR studies. The differences and similarities noted in the chemical content of the dihydro-content/lg4402v635942486/xxlarge946.gif" alt="beta" align="MIDDLE" BORDER="0">-agarofuran sesquiterpenes from the fourMaytenus species from Chile are in line with the taxonomic characterization of these species; their geographical distribution is also given.     

β-Phellandrene: kairomone for pine engraver,Ips pini (Say) (Coleoptera: Scolytidae)

The responses ofIps pini (Scolytidae) to multiple-funnel traps baited with the pheromone, ipsdienol, and various monoterpenes were determined in stands of lodgepole pine in southern and central British Columbia.Ips pini was attracted to both ipsdienol and content/wwp047245863751t/xxlarge946.gif" alt="beta" align="MIDDLE" BORDER="0">-phellandrene, demonstrating that content/wwp047245863751t/xxlarge946.gif" alt="beta" align="MIDDLE" BORDER="0">-phellandrene is a kairomone for this species.Lasconotus complex (Colydiidae) and aCorticeus sp. (Tenebrionidae) were attracted to both ipsdienol and content/wwp047245863751t/xxlarge946.gif" alt="beta" align="MIDDLE" BORDER="0">-phellandrene. TheCorticeus sp. exhibited a synergistic response to the combination of ipsdienol and content/wwp047245863751t/xxlarge946.gif" alt="beta" align="MIDDLE" BORDER="0">-phellandrene; the responses of the other two species to the combination were additive. The predators,Thanasimus undatulus, Enoclerus sphegeus, andE. lecontei (Cleridae), were attracted to ipsdienol-baited traps, whileMonochamus clamator (Cerambycidae) andDendroctonus ponderosae (Scolytidae) were attracted to content/wwp047245863751t/xxlarge946.gif" alt="beta" align="MIDDLE" BORDER="0">-phellandrene. Attraction of all eight species increased with increasing release rates of ipsdienol and/or content/wwp047245863751t/xxlarge946.gif" alt="beta" align="MIDDLE" BORDER="0">-phellandrene.     

Surface of a Titanium Target After Interaction with Shaped‐Charge Jet Particles

Coatings containing content/lr718x436gj02807/xxlarge946.gif" alt="beta" align="MIDDLE" BORDER="0">content/lr718x436gj02807/xxlarge8208.gif" alt="dash" align="MIDDLE" BORDER="0">WC_1-x and W₂C_1-x tungsten carbides were produced on titanium targets by a shapedcontent/lr718x436gj02807/xxlarge8208.gif" alt="dash" align="MIDDLE" BORDER="0">charge explosion. The experiment used conical liners with a cone angle of 30° manufactured from a mixture of fine powders of tungsten, graphite, and ammonium nitrate. A comparative quantitative xcontent/lr718x436gj02807/xxlarge8208.gif" alt="dash" align="MIDDLE" BORDER="0">ray analysis of the top and bottom layers of the coating was performed. For the phase content/lr718x436gj02807/xxlarge946.gif" alt="beta" align="MIDDLE" BORDER="0">content/lr718x436gj02807/xxlarge8208.gif" alt="dash" align="MIDDLE" BORDER="0">WC_1-x in the bottom layer, the value of the cubic unit cell parameter falls outside the range known in the literature. Microhardness in different segments of the target was studied.     

Effect of emulsion temperature on physical properties of palm oil-based margarine

Margarines made from refined, bleached, and deodorized palm oil at different emulsion temperatures showed no significant difference in their consistency, polymorphic behavior, and solid fat content (SFC) during storage, although differences were observed during processing. The emulsion temperatures studied were 40, 45, and 50°C, with other parameters such as emulsion flow rates, tube cooler temperature, and pin rotor speed kept constant. The SFC developed during processing and storage at 28°C was measured to evaluate the quality of margarine. The emulsion contained no SFC at any emulsion temperature studied. However, the amount of SFC in the perfector or tube cooler unit increased to 15.9, 13.9, and 15.6% in margarine produced at emulsion temperatures of 40, 45, and 50°C, respectively. At 40°C, the lowest SFC was developed during storage even though this margarine had the highest consistency. The softening point of this sample was moderately high and closely related to the type of crystal developed, which was a mixture of β′ and β crystals. Emulsion at 45°C gave the most stable margarine consistency and SFC with crystal in the β′ form even after the fourth week. At 50°C, moderately soft product was produced, which might be undesirable for some applications, although the crystals were in the β′ form.     

装药密度及尺寸对RDX基含铝炸药爆压爆速的影响

利用锰铜压力传感器和测时仪测量了不同装药密度和尺寸下的RDX基含铝炸药的爆压和爆速,拟合出了爆压、爆速与装药密度的关系式,研究了装药密度和尺寸对RDX基含铝炸药爆压、爆速的影响。结果表明,随着密度的增加,RDX基含铝炸药的爆压和爆速均增加;当装药直径和装药长度分别达到20 mm和40 mm时,RDX基含铝炸药已经达到稳定爆轰,装药直径和装药长度再增加,爆压和爆速基本不变。