Nanozeolite‐LTL with GdIII Deposited in the Large and EuIII in the Small Cavities as a Magnetic Resonance Optical Imaging Probe

The immense structural diversity of more than 200 known zeolites is the basis for the wide variety of applications of these fascinating materials ranging from catalysis and molecular filtration to agricultural uses. Despite this versatility, the potential of zeolites in medical imaging has not yet been much exploited. In this work a novel strategy is presented to selectively deposit different ions into distinct framework locations of zeolite‐LTL (Linde type L) and it is demonstrated that the carefully ion‐exchanged Gd/Eu‐containing nanocrystals acquire exceptional magnetic properties in combination with enhanced luminescence. This smart exploitation of the framework structure yields the highest relaxivity density (13.7 s^?1 L g^?1 at 60 MHz and 25 °C) reported so far for alumosilicates, rendering these materials promising candidates for the design of dual magnetic resonance/optical imaging probes, as demonstrated in preliminary phantom studies.     

A Cyclopeptide‐Derived Molecular Cage for Sulfate Ions That Closes with a Click

The 2:1 sandwich‐type complexes formed between a cyclopeptide with alternating L ‐proline and 6‐aminopicolinic acid subunits and inorganic anions can be stabilized by covalently linking a tris‐alkyne and a tris‐azide derivative of this peptide through copper‐catalyzed azide–alkyne cycloaddition. The resulting triply linked bis‐cyclopeptide can interact with anions such as sulfate ions in aqueous solution by including them into the cavity between the two cyclopeptide rings, where they can form hydrogen bonds to amide NH groups, distributed along the inner surface. The binding kinetics of this system differ significantly from those of a bis‐cyclopeptide that contains only one linker because the rate of guest exchange is considerably slower. Thermodynamically, the stability of the sulfate complex of the triply linked bis‐cyclopeptide approaches a log K_a value of 6 in H₂O/CH₃OH 1:1 (v/v) which is, however, only approximately one order of magnitude larger than affinity of the more flexible monolinked analogue. Titration calorimetry revealed that this behavior is mainly due to the change in the binding enthalpy from exothermic to endothermic upon increasing the number of linkers. Results from NMR spectroscopy and X‐ray crystallography indicate that the mono‐ and triply linked bis‐cyclopeptides adopt similar conformations in their complexes with sulfate ions, but the complex formation is enthalpically unfavorable for the cage. The substantial entropic contribution to sulfate complexation of this receptor more than compensates for this disadvantage, so that the overall sulfate affinity of both bis‐cyclopeptides ends up in the same range. These investigations provide important insight into the structure–property relationships of such receptors, thus leading the way to further structural improvement.     

长江外贸集装箱运量预测和码头装卸工艺优选

本文利用新陈代谢ＧＭ（１，１）模型、二次指数滑动平均法、计量经济学模型３种预测模型对上海港进行了外贸集装箱吞吐量的预测，并结合考虑长江各主要港口在共同航线上的运量分配及航线运量占该港吞吐量的比重，对各港口进行了外贸集装箱吞吐量和主要航线运量预测。然后，运用多目标决策理论中的线性分配法与层次分析法，分析了不同运量水平下港口装卸工艺系统的优选问题，并利用外贸集装箱的预测结果，得到了这些港口装卸工艺的优     

食品罐头内真空度的无损检测

至少有十种方法可用来检测食品罐头内的真空度。本文特别介绍一种扫频式电磁场声电检测法。这种方法的原理如下;扫频式电磁场作用于罐头的罐盖而使之振动,振动的音响由一个电探头所检测。研究已经表明,罐盖的振动的自然频率与罐内的真空度有关,自然频率随真空度的升高而增加。本文论述这种方法和装置的详细结果。     

用胀形法成形球形容器的两个失稳方程

简述了胀形时用主应力法求金属球形容器内压的计算方法，就容器材料服从常见的幂指数硬化方程σ=B∈^n，提出了胀形时的两个失稳方程，并对方程作了分析，得出了一些有用的结论．     

城市旧城改造的房屋拆迁补偿问题研究

随着经济的发展和城市改造步伐的加快,许多城市都面临着旧城房屋拆迁问题.房屋拆迁牵涉到广大群众的切身利益,由此而引发的冲突也时有发生.该文从政策法规和评估技术两个角度,对冲突产生的原因进行比较全面的分析,并提出了解决冲突的建议.     

亚洲地区1918—1970年7级以上强震重新定位与震源机制测量及结果的不确定性分析

通过光学字符识别(OCR)软件, 整理世界地震台网1918—1970年的世界台站震相报告, 对该时期发生在亚洲及周边地区7级以上强震的震源位置及部分强震的震源机制(断层面解)进行测量。使用1918—1970年《国际地震资料汇编》(ISS)和EHB Bulletin的震相到时和到时差, 对该时段338个7级以上地震事件进行重新定位, 得到其中316个地震事件的可靠定位。使用1933—1970年ISS和EHB Bulletin的P波初动数据, 对该时段244个地震事件求解震源机制解, 得到其中209个地震事件的震源机制解。研究结果丰富了亚洲地区基于全球地震台网观测的1918—1970年仪器记录早期近现代强震目录震源机制资料, 并提供一种研究近现代地震的可行方法, 对开展其他地区或其他震级范围的仪器记录早期近现代地震研究具有启发作用。     

双室比较型温室效应实验装置研制

研制了一套双室比较型温室效应的实验装置,采用温度传感器进行气温的实时测量与对比。利用该实验装置对二氧化碳（CO2）和水蒸气进行定量的温室效应实验,指出气体浓度、地表环境和植物环境对温度上升下降过程的影响。     

混合顺序作业堆场BAY优化模型

介绍了集装箱堆场优化的重要意义,提出了混合顺序堆场作业的概念,在图搜索技术和模式识别理论的基础上建立了随机条件下的混合顺序作业堆场ＢＡＹ优化模型,计算机模拟结果证明：混合顺序作业堆场ＢＡＹ优化模型可以在堆场作业不倒箱的情况下,产生符合配载要求的堆场。     

铁路车站集装箱管理信息系统

本文通过对我国铁路车站集装箱作业的分析,设计了“集装箱管理信息系统”。系统主要包括以下功能:(1)文件初始化及修改;(2)集装箱作业管理;(3)集装箱动态管理;(4)集装箱的统计及台账管理。文章还叙述了系统的硬件在集装箱作业站的一般配置,以及系统的特点和计算机网络形成后系统功能的扩充方向。