四联合硫磺氢分析仪预处理改造

四联合硫磺一期氢分析仪AT2510由于预处理的设计缺陷,对工艺生产和仪表维护都带来很大的麻烦。通过查找资料以及近两个月的反复试验,确定了改造方案,对于处理进行了改造,投用后效果良好。     

红外线气体分析在合成氨装置中的应用和改造

介绍了红外线气体分析仪的测量原理以及在合成氨装置中的应用情况。对 使用中出现的故障和原因进行了分析,对预处理装置的改造提出了相应的措施。     

328R型氧分析仪预处理系统的改造

预处理系统配置的合理性是影响氧分析仪运行的关键因素.本文介绍了328R型氧分析仪预处理系统改造的情况,改造后显著降低了分析仪故障次数,取得了良好的经济效益.     

气化装置洗涤塔出口粗水煤气在线分析仪预处理系统改造

对气化装置洗涤塔出口粗水煤气在线分析仪预处理系统进行改造,解决了原有预处理在使用中出现的问题.     

关于罐车拉运原油密闭计量技术的探讨

本文讲述了引进复合式含水分析仪、卸油计量系统,自主研制密闭油罐,对联合站原有单拉原油计量系统进行改造,形成了罐车拉运原油密闭计量技术,解决了以往传统的人工过磅、取样,人工测定含水造成计量误差大的问题。     

气化装置洗涤塔出口粗水煤气在线分析仪预处理系统改造

对气化装置洗涤塔出口粗水煤气在线分析仪预处理系统进行改造,解决了原有预处理在使用中出现的问题。     

红外线气体分析仪在合成氨装置中的应用和改造

介绍了Unor型红外线气体分析仪在合成氨装置中的应用情况、工作原理、使用过程中所遇到的故障和对预处理装置进行的改造措施。     

EO/EG装置氧表预处理系统的改进

针对EO/EG装置氧表预处理系统在实际应用中存在的问题,对原预处理系统中减压阀、流量报警设备设置不合理,造成氧表测量值频繁波动影响工艺生产的问题进行了相应改造,改造后的预处理系统的样品条件达到了氧表的使用要求。     

用连续流动分析仪总氮通道测六价铬的探讨

将已有的荷兰Skalar连续流动分析仪中测定总氮的模块进行简单改造,用于测定水体中六价铬。结果显示,测定结果与国标方法无显著差异。本方法既可以利用现代化仪器高效快速的优点,又为单位或企业节约了二次采购仪器的成本。     

热分析数据系统的开发及应用研究

研究开发出一套可用于改造老式热分析仪的数据处理系统。该系统适用于早期进口的各外国公司和国产的不同型号的DSC、TG、DTA和TMA等仪器 ;可在Windows　 95 / 98下运行 ;不但可以有效地提高各种老式仪器的工作效率 ,还可以对实验数据进行各种处理 ,并把结果 (曲线 )以图片方式直接剪贴到用words软件处理的文字文件中     

Amino-Acid-Anthraquinone Click Chemistry Conjugates Selectively Target Human Telomeric G-Quadruplexes

Guanine-rich sequences are known to fold into G-quadruplex (G4) arrangements, which are present in oncogenes and in the telomeric regions of chromosomes. In particular, G4s represent an obstacle to functioning of telomerase, an enzyme overexpressed in cancer cells causing their immortalization. Therefore, G4 stabilization using small molecules represents an appealing strategy for the medicinal chemist. Ligands based on an anthraquinone scaffold, to which peptidic side chains were attached by an amide bond, were previously reported. We envisioned improving this ligand concept leveraging the click chemistry approach, which, besides representing a flexible, high yielding synthetic strategy, allows an elongation of the side chains and an increase of π–π stacking and H-bond interactions with the nucleobases through the triazole ring. Compounds were tested for their ability to interact with G4 DNA with a multiple analytical approach, demonstrating an elevated aptitude to stabilize the G4 and high selectivity over double stranded DNA.     

Analysis of cell aggregation in the culturing of cerebellar granule neurons

We have proposed previously that an increased concentration of growth factor secreted by neurons themselves has a direct effect on survival of the neurons, and thereby cell density serves as a regulator of survival of neurons. In this study, the same idea was used to analyze the aggregation of cerebellar granule neurons in culture experimentally and theoretically. Assuming the transport of growth factor and substrate within an aggregate is by molecular diffusion, the metabolic efficiency of neurons, on the basis of an autocatalytic phenomenon, was increased within an aggregate compared to an identical quantity of dispersed cells. A good agreement in the size of neuronal aggregate between the theoretical prediction and the experimental result was found. This illustrates that growth factors produced by neurons acting in either an autocrine or paracrine manner play an important role during the development of cultured neurons.     

Optimal design and integration of an air separation unit (ASU) for an integrated gasification combined cycle (IGCC) power plant with CO2 capture

The air separation unit (ASU) plays a key role in improving the efficiency, availability, and operability of an oxygen-fed integrated gasification combined cycle (IGCC) power plant. An optimal integration between the ASU and the balance of the plant, especially the gasifier and the gas turbine (GT), has significant potential for enhancing the overall plant efficiency. Considering the higher operating pressure of the GT, an elevated-pressure air separation unit (EP-ASU) is usually favored instead of the conventional low-pressure air separation units (LP-ASU). In addition, a pumped liquid oxygen (PLOX) cycle is usually chosen if the operating pressure of the gasifier is high. A PLOX cycle helps to improve plant safety and availability and to decrease the capital cost by reducing the size of the oxygen compressor or by eliminating it completely. However, the refrigeration lost in withdrawn liquid oxygen must be efficiently recovered. This paper considers five different configurations of an ASU with PLOX cycle and compares their power consumptions with an EP-ASU with a traditional gaseous oxygen (GOX) cycle. The study shows that an optimally designed EP-ASU with a PLOX cycle can have similar power consumption to that of an EP-ASU with GOX cycle in the case of 100% nitrogen integration. In the case of an IGCC with pre-combustion CO₂ capture, the lower heating value (LHV) of the shifted syngas, both on a mass and volumetric basis, is in between the LHV of the unshifted syngas from an IGCC plant and the LHV of natural gas, for which the GTs are generally designed. The optimal air integration in the case of a shifted syngas is found to be much lower than that of an unshifted syngas. This paper concurs with the existing literature that the optimal integration occurs when air extracted from the GT can be replaced with the nitrogen from the ASU without exceeding mass/volumetric flow limitations of the GT. Considering nitrogen and air integration between the ASU and the GT, this paper compares the power savings in an LP-ASU with a PLOX cycle to the power savings in an EP-ASU with GOX cycle and EP-ASU with PLOX cycle. The results show that an LP-ASU with a PLOX cycle has less power consumption if the nitrogen integration levels are less than 50-60%. In addition, a study is carried out by varying the concentration of nitrogen and steam in the fuel diluents to the GT while the NOx level was maintained constant. The study shows that when the nitrogen injection rate exceeds 50%, an EP-ASU with a PLOX cycle is a better option than an LP-ASU with a PLOX cycle. This paper shows that an optimal design and integration of an ASU with the balance of the plant can help to increase the net power generation from an IGCC plant with CO₂ capture.     

潮州市生态城市规划初探

通过分析与研究生态城市规划的任务、原则、目标和方法,结合具体实际工程,在城市总体规划中引入了生态规划的内容,尝试探索生态城市建设规划的有效途径,以期对广东省的生态建设及城市可持续发展起到一定的促进作用。     

Rapid thermal annealing effect of transparent ITO source and drain electrode for transparent thin film transistors

We investigated the rapid thermal annealing (RTA) sequence effect on the electrical, optical, morphological, and structural properties of transparent thin film transistors (TTFTs) with an indium gallium zinc oxide (IGZO) channel and an indium tin oxide (ITO) source/drain. The electrical and optical properties of the IGZO channel and the ITO source/drain electrodes were compared as a function of RTA temperature in ambient air. The performance of a TTFT with only an RTA-processed IGZO channel was compared with that of a TTFT with an RTA-processed IGZO channel and ITO source/drain electrodes. Using the circular transmission line measurement (CTLM) method, we suggest a possible mechanism that explains the effect of the RTA process on the performance of the TTFT with only an annealed IGZO channel vs. that with an annealed IGZO/ITO multilayer. The TTFT with an RTA-processed IGZO/ITO multilayer showed a threshold voltage shift, an improved on/off ratio of 3.54 × 10¹¹, a subthreshold swing of 0.33 V/decade, and a high mobility of 8.69 cm²/V·s. This indicates that simultaneous RTA processing for an IGZO channel and an ITO electrode is beneficial for the fabrication of high-performance TTFTs.     

Study of aluminium bonded joints by analytical electron microscopy: Microstructural changes with aging

This study concerns the influence of aging on the microstructural characteristics of each component in bonded joint systems consisting of an aluminium alloy substrate (2024) clad with an aluminium sheet, an oxide layer obtained by surface treatment ('optimized' chromic-sulphuric acid etching, chromic acid anodizing, or phosphoric acid anodizing), an epoxy-novolac-based composite primer, and an epoxy-based adhesive film. The samples studied were obtained by ultrathin cross-section microtomy of the bonded joints (before and after aging). The microcharacterization was carried out using a transmission electron microscope (TEM) equipped with an X-ray energy-dispersive spectrometer (EDS), an electron energy-loss spectrometer (EELS), and an energy-filtered imaging system. Detailed analyses revealed that microstructural changes occur during aging in the primer in contact with the oxidized substrate and that the thickness of the modified zone depends on the underlying oxide. In addition, it is shown that a 'true' interphase about 200 nm thick is formed between the primer and adhesive by a diffusional process.     

Iridium‐Catalyzed Allylic Amination Route to α‐Aminoboronates: Illustration of the Decisive Role of Boron Substituents

The development of a new route to α‐aminoboronates using an iridium‐catalyzed allylic amination on boronated substrates is described. Unlike the boronate group, the trifluoroborato substituent was found to govern the regioselectivity exclusively in favor of branched products. The transformation of an allylic substitution product into an α‐aminoboronic ester in an efficient way validated the implementation of this approach.     

Stress Analysis of T-type Butt Adhesive Joint Subjected to External Bending Moments

Stress distributions and displacements at the interface between an adhesive and an adherend are examined when a T-type butt adhesive joint, in which two thin plates are joined, is subjected to an external bending moment. In the analyses, general representations of the stresses and the displacements are given using a two-dimensional theory of elasticity in the case where two dissimilar plates are joined. Next, in the case of plates with the same material, effects of Young's modulus of plates to that of an adhesive and the thickness of the adhesive on the stress distribution are made clear by numerical computations. For verification, experiments are performed and an analytical result is in a fairly good agreement with an experimental one.     

Leakage radiation microscopy of surface plasmons launched by a nanodiamond-based tip

Leakage-radiation microscopy of a thin gold film demonstrates the ability of an ensemble of fluorescent diamond nanoparticles attached onto the apex of an optical tip to serve as an efficient near-field surface-plasmon polariton launcher. The implementation of the nanodiamond-based tip in a near-field scanning optical microscope will allow for an accurate control on the launching position, thereby opening the way to scanning plasmonics.     

Development of electrokinetic-flushing technology for the remediation of contaminated soil around nuclear facilities

The effects of a flushing by a pump on an electrokinetic-flushing remediation of contaminated soil were estimated. The soils were sampled from the sites around nuclear facilities which were built on a high hydro-conductivity of sandstone. An electrokinetic-flushing equipment with a pump was manufactured to estimate the effect of a flushing on an electrokinetic-flushing remediation. In order to select an optimal reagent suitable to the characteristics of a soil near nuclear facilities, 4 experiments were executed with 4 candidate reagents selected from 12 reagents and the results of the experiments are as follows. The removal efficiencies of cobalt and cesium from the contaminated soil with the acetic acid were the highest, which were 92.1% and 83.1%, respectively. The effluent solution volume generated from an electrokinetic remediation was very smaller and it was 5% below that from a soil washing. Next, the results from a comparison of an electrokinetic-flushing remediation and an electrokinetic remediation revealed that the removal efficiencies of Co²⁺ and Cs⁺ by an electrokinetic-flushing remediation for 5 days were increased by 25% and 35% when compared to those by the electrokinetic remediation, but the effect of a flushing by the electrokinetic-flushing equipment started to decrease after 5 days. The removal efficiencies of Co²⁺ and Cs⁺ by an electrokinetic-flushing remediation for 15 days were increased by 6.8% and 7.7% when compared to that by an electrokinetic remediation. Namely, the higher the hydro-conductivity of a soil was, the larger the effect of a flushing was on an electrokinetic-flushing remediation.