甲基四氢苯酐合成工艺的研究

以气态混合C5和顺酐的甲基四氢苯酐溶液为原料合成甲基四氢苯酐,对间歇合成反应和连续合成反应进行研究。研究表明间歇反应中传质面积对反应的影响较大,连续反应时,进料比对顺酐转化率影响较明显,温度对两种反应的影响都不显著。     

多相雾化喷嘴混合特性的研究

采用经典的KI-KIO_3平行竞争反应体系来研究多相雾化喷嘴的微观混合特性,考察了该多相雾化喷嘴在各种操作条件下的微观混合情况,找出了不同条件下微观混合效果的变化规律.实验结果表明,增大雾化气量或减小进液量,提高气液比,均可显著改善多相雾化喷嘴的微观混合效果,当气液质量比大于3.7时,微观混合良好.进料流量比a(V_A/V_B)对分割指数X,影响显著,当a小于0.35时,雾化效果对分割指数影响不大,在较低的气液质量比下就能达到较小的分割指数.     

Identifying strategic management concepts: An analytic network process approach

This paper presents an approach to the identification of an organization’s strategic management concepts (SMCs) – mission, vision, values and competences. The highly qualitative relationships among these concepts are operationalized using the Analytic Network Process (ANP). As ANP captures the outcome of dependence and feedback between components of elements, the proposed approach enables us to handle indirect relationships and complex interactions existing among the SMCs. The alternatives with the highest overall priorities, resulting from the ANP, are selected as the organization’s most dominant SMC set. To improve the quality of the decision further analysis of the ANP results is suggested. Accordingly, alternative concept sets are derived by applying two approaches – bottom-up and top-down. The bottom-up approach indicates an explorative perspective where only common values and core competences held by the organization are used to identify the corresponding mission and vision statements. On the other hand, the top-down approach indicates a normative perspective where the necessary values and competences are determined according to a given desired vision statement. The proposed ANP approach has been applied to the Industrial Engineering Department (IED) of Istanbul Technical University. In light of the dominant, bottom-up and top-down sets, a final set of SMCs has been suggested for the IED.     

Technology-mediated information sharing between patients and clinicians in primary care encounters

Objective: The aim of this study was to identify and describe the use of electronic health records (EHRs) for information sharing between patients and clinicians in primary-care encounters. This topic is particularly important as computers and other technologies are increasingly implemented in multi-user health-care settings where interactions and communication between patients and clinicians are integral to interpersonal and organisational outcomes. Method: An ethnographic approach was used to classify the encounters into distinct technology-use patterns based on clinicians’ interactions with the technology and patients. Each technology-use pattern was quantitatively analysed to assist with comparison. Quantitative analysis was based on duration of patient and clinician gaze at EHR. Findings: Physicians employed three different styles to share information using EHRs: (1) active information sharing, in which a clinician turns the monitor towards the patient and uses the computer to actively share information with the patient; (2) passive information sharing, when a clinician does not move the monitor, but the patient might see the monitor by leaning in if they choose and (3) technology withdrawal, when a clinician does not share the monitor with the patient. Conclusion: A variety of technology-mediated information-sharing styles may be effective in providing patient-centred care. New EHR designs may be needed to facilitate information sharing between patients and clinicians.     

含内置过滤器的三相流化床流动特性探索

在含内置过滤器的三相流化床装置中,以空气、水、沙子三相为研究介质,对其过滤特性进行研究,考察了操作条件对过滤通量、反吹时间间隔、临界液速、最大液速的影响.结果表明:气速越大过滤通量越大;反吹时间间隔随液速增大明显减小,随气速增大而减小的慢;临界液速随气速增加而增大;最大液速随气速的增大而减小.     

2-硝基-4-氯甲苯催化加氢反应研究

主要对2-硝基-4-氯甲苯液相加氢制备2B油工艺进行了研究。考察了催化剂用量,反应温度,反应压力对反应收率的影响。研究表明,1.2 MPa下,反应温度70℃,催化剂含量5%,产物的综合效益最高。     

Phase equilibrium data for aqueous solutions of formic acid with 2-ethyl-1-hexanol at T=(298.2, 308.2, 318.2, and 328.2) K

Liquid-liquid equilibrium (LLE) data for the system of (water+formic acid+2-ethyl-1-hexanol) were experimentally determined at T=(298.2, 308.2, 318.2, and 328.2) K and atmospheric pressure. A type-2 LLE was obtained for this ternary system. The influence of temperature on the equilibrium characteristics was found to be smallat the temperatures studied. Distribution coefficients and separation factors were calculated over the immiscibility regions. The experimental tie-line data were correlated using the UNIQUAC model. The values of the interaction parameters between each pair of the components were obtained for this thermodynamic model. The root mean square deviation (RMSD) between the observed and calculated mass fractions was 0.61%.     

Electrochemical and Corrosion Behaviors of Mild Steel Coated with Polypyrrole

Polypyrrole films are formed on low-carbon steel by electropolymerization in solutions of oxalic acid. Their morphology and corrosion properties are studied by the methods of scanning electron microscopy and dc polarization. Polypyrrole coatings increase the corrosion potentials and decrease the corrosion currents in neutral solutions of chlorides and basic solutions.     

Comparative study of conventional and magnetically coupled piezoelectric energy harvester to optimize output voltage and bandwidth

Energy harvesting has experienced significant attention from researchers globally. This is due to the quest to power remote sensors and portable devices with power requirements of tens to hundreds of μW. Hence, ambient vibration energy has the potential to provide such power demands. Thus, cantilever beams with piezoelectric materials have been utilized to transduce mechanical energy in vibrating bodies to electrical energy. However, the challenge is to develop energy harvesters that can harvest sufficient amount of energy needed to power wireless sensor nodes at wide frequency bandwidth. In this article, piezoelectric energy harvester (PEH) beams with coupled magnets are proposed to address this issue. With macro fiber composite as the piezoelectric transducer, mathematical models of different system configurations having magnetic couplings are derived based on the continuum based model. Simulations of the system dynamics are done using numerical integration technique in MATLAB software to study the influence of magnetic interactions in generating power and frequency bandwidth due to base excitations at low frequency range. Experimental results comparing conventional system and the proposed piezoelectric beam configurations with coupled magnets are also presented. Finally, the optimal beam separation distance between the magnetic oscillator and PEH is presented in this work.