多组份阳离子易染共聚纤维的开发

本文在分析多组份阳离子易染共聚酯切片性能的基础上,重点研究探讨了干燥温度、纺丝温度、拉伸温度和拉伸倍率以及网络压缩空气压力等因素,对多组份阳离子易染共聚酯纤维生产的影响.这一具有多种优异功能的纤维的开发成功,为国内利用改性聚酯生产涤纶仿真丝织物开辟了又一新的技术途径.     

多组份改性聚酯纤维的研究

讨论了多组份改性聚酯纤维在常规纺丝速度下的生产工艺条件。试验结果表明，纺丝温度、纺丝压力、侧吹风速度和风温等工艺参数是影响纺丝成形过程中纺丝熔体的流变性能和可约性以及卷绕丝性能的关键因素，而拉伸工艺条件还直接影响到多组份改性聚酯纤维的力学行为及成品丝的质量.     

多组份生料乳浊釉的试验研究

作者经过一系列试验，研究探讨了多组份生料乳浊釉的乳浊机理，指出采用多组份乳浊剂可获得单一组份乳浊剂难以达到的效果。     

多组份精馏塔数字仿真

描述多组份精馏塔要用众多的方程式,数字仿真是求得它的动态响应的有效方法,如果有J个组份,不是理论板,非恒分子流,在一块加料板上有气、液混合进料,并假设回流R及再沸器供热量Q_B恒定,在这样的条件下本文编排了仿真程序,仿真结果与文献[1]提供的数据一致,稍加更动后也可仿真其他情况。     

用率值公式法计算四组份配料的生料配比

配料计算虽方法繁多,但常用的尝试误差法计算费时费力。近几年来推导出的率值公式法,则计算准确、速度也快,对四组份配料相当适用。文章详细介绍了率值公式法的系列公式,并进行了实例配料计算;同时依据率值公式法的计算公式,并采用Excel软件强大的矩阵功能,实现了计算机快速、准确的生料配料计算。     

多工位配料落差预估模型的建立

针对配料过程的速度控制进行了工程化改进,在多工位累计称量中,物料的累积使给料器出口与料筐内物料高度不断发生变化,根据给料速度和称量高度建立正在下落物料量的预估模型,采用预估模型与传统的预关门控制方法进行对比。仿真结果表明预估模型优于传统的预关门控制方法,可在多工位配料中使用。     

全自动多物料配料站

长陆公司发了全自动多物料配料站,以满足化工、橡塑和食品等行业对于多物料粉体配料的需求。使用该设备时,利用配料生产的自动化管理功能,在避免人为失误的同时,也提高了生产效率,     

阿博格“多组份注射成型”技术

9月25日，阿博格公司在深圳东方银座酒店举办“多组份注射成型”研讨会，由应用技术支持闫路顺工程硕士主讲。为用户讲解多组份技术的历史与优点。来自各地的Arburg用户到现场听取报告。     

智能化多工位物料自动配料系统简介

对智能化多工位物料自动配料系统作了简要介绍,该系统技术起点高,性能好,运行可靠,操作环境好,用户使用非常满意。     

The alexandrite effect of the Tavernier diamond caused by fluorescence under daylight

The 56.07-carat Tavernier pear-shaped gem diamond not only has an important historical provenance, but also shows a substantial color change between incandescent light and daylight. This famous diamond exhibits a very strong blue fluorescence when exposed to long-wavelength ultraviolet (UV) radiation. It appears light brown (an orange hue) under incandescent light, and light pink (a purple hue) under daylight. This change in color, or “alexandrite effect,” is caused by its very strong blue fluorescence resulting from the long-wavelength ultraviolet component present in daylight. © 1998 John Wiley & Sons, Inc. Col Res Appl, 23, 323–327, 1998     

预应力管桩上浮的预防及处理

介绍挤土桩设计时应注意事项及对基桩上浮的处理。     

Preparation of molecularly imprinted fluorescence sensor based on carbon quantum dots via precipitation polymerization for fluorescence detection of tetracycline

A facile and effective method was proposed to prepare the molecularly imprinted fluorescence sensor with carbon quantum dots, which were modified vinyl groups by acrylic acid on the surface. The obtained fluorescence composite material was investigated by transmission electron microscope and Fourier transform infrared spectra. After the experimental conditions were optimized, a linear range of 1.0–60 μmol L⁻¹ was obtained and the detection limit was 0.17 μmol L⁻¹. The novel fluorescence sensor can be successfully used to detect tetracycline in real samples. This study provides a convenient strategy for selective recognition and rapid detection of tetracycline in the complex environment.     

An improved method for determining the composition of FFA in red tide flagellates by RP-HPLC with fluorescence detection

An improved method for determining the composition of FFA in red tide flagellates by HPLC with fluorescence detection is described. For this purpose, total lipids from Heterosigma akashiwo, Chattonella antiqua, and C. marina were allowed to react with 9-anthryldiazomethane, then the resulting 9-anthrylmethyl esters of FFA were analyzed without any purification by RP-HPLC on a highly efficient C18 column (Superspher 100 RP-18e, 25 cm×4 mm i.d., 4 μm particle size; Merck, Darmstadt, Germany). Clear separations of long-chain saturated and unsaturated FFA, including 14∶0 and 16∶1, which were major components in the flagellates and were unresolved on a previously used C18 column, were achieved by a stepwise gradient elution using acetonitrile, water, and propan-2-ol. Two characteristic FA, 18∶5n−3 and trans-16∶1n−13, whose behaviors on RP-HPLC had not been reported previously, were also clearly separated from the other FFA. The FFA compositions of the flagellates determined by HPLC were in good agreement with those obtained by GLC. The present method is simple and sensitive, and would be widely applicable for compositional analysis of microalgal FFA.     

反应型荧光探针在检测金属离子中的研究进展

金属离子广泛存在于自然界中,与环境科学、生命科学、医学等领域有着密切的联系。一些金属离子如Hg²⁺、Fe³⁺、Cu²⁺、Zn²⁺、Al³⁺等,在生物体的生理和病理中扮演着重要角色,摄入过量或不足都会导致生理功能的紊乱,引发各种疾病。近几年来,反应型荧光探针因其高选择性和高灵敏性的特点得到了快速的发展。本文主要综述了近五年来反应型荧光探针在检测金属离子中的研究进展,主要介绍了各类探针分子的设计合成、传感机理、检测结果以及其在生物检测中的应用。指出反应型荧光探针的研究发展还处在初级阶段,该领域将会朝着灵敏度更高、反应时间更少、应用范围更广的方向发展,此外,反应型荧光探针在生物检测以及实际应用方面也有望得到进一步的应用发展。     

提高焦炉气甲醇生产中总碳利用率的措施

在以焦炉气为原料生产甲醇过程中,新鲜合成气的总碳利用率达不到设计要求,为此采取了调整转化炉工艺操作条件的措施,即提高转化炉温度和压力、降低水碳比等以降低新鲜合成气中CO2的含量。改进后,催化剂使用后期的精甲醇产量和新鲜合成气的总碳利用率分别提高了19 t/d和9.4%,CO2排放量减少了8 623 t/a。     

稻草原料挤压法全组分资源化利用技术可行性分析

稻草原料挤压法全组分资源化利用技术是建立在稻草原料高半纤维素含量基础上,利用挤压法纤维分离技术低能耗、多功能的特点,以半纤维素制备水解液、纤维素制备人纤浆、其余组分制备高效有机肥为主要资源化利用方向。从原料化学组分、基于纤维素含量的原料成本、酸水解液的可资源化利用程度等角度对该技术实施进行可行性分析,结果表明该技术在技术上、经济上均具有可行性;同时,通过主要技术关键的讨论最终提出具有代表性的工艺流程。     

Analysis of saturated free fatty acids from pollen by HPLC with fluorescence detection

A sensitive method for the determination of free fatty acids using 2‐(2‐(anthracen‐10‐yl)‐1H‐naphtho[2,3‐d]imidazol‐1‐yl) ethyl‐p‐toluenesulfonate (ANITS) as tagging reagent with fluorescence detection has been developed. ANITS could easily and quickly label fatty acids in the presence of the K₂CO₃ catalyst at 90 °C for 40 min in N,N‐dimethylformamide solvent. From the extracts of rape bee pollen samples, 20 free fatty acids were sensitively determined. Fatty acid derivatives were separated on a reversed‐phase Eclipse XDB‐C₈ column by HPLC in conjunction with gradient elution. The corresponding derivatives were identified by post‐column APCI/MS in positive‐ion detection mode. ANITS‐fatty acid derivatives gave an intense molecular ion peak at m/z [M+H]⁺; with MS/MS analysis, the collision‐induced dissociation spectra of m/z [M+H]⁺ produced the specific fragment ions at m/z [M–345]⁺ and m/z 345.0 (here, m/z 345 is the core structural moiety of the ANITS molecule). The fluorescence excitation and emission wavelengths of the derivatives were λ_ex = 250 nm and λ_em = 512 nm, respectively. Linear correlation coefficients for all fatty acid derivatives are >0.9999. Detection limits, at a signal‐to‐noise ratio of 3 : 1, are 24.76–98.79 fmol for the labeled fatty acids.     

熔融制样-X射线荧光光谱法测定铈锆固溶体中的元素成分

探讨了用熔融制样-X射线荧光光谱法对铈锆固溶体中CeO 2、ZrO 2、La 2 O 3、HfO 2、Pr 6O 11进行全定量分析的方法。采用经验α系数和散射线内标法校正基体效应,以上海市计量测试技术研究院提供的GBE标准物质为基体制备标准样品,以四硼酸锂为熔剂、硝酸铵为氧化剂、碘化铵为脱模剂进行熔融制样,采用热电Advant’X型X射线荧光光谱仪分析,结果与标准值或化学法相符。     

基桩验证检测问题的认识和探讨

对常用的5大类检测方法优缺点作了简要介绍,提出了验证检测的实施原因及其应用范围,指出验证检测要体现正确评价与经济合理的原则,并用工程实例说明了验证检测在实际检测工作中的应用。