乙酰苯胺的微波合成研究

报导了采用微波辐射技术,以苯胺、冰乙酸为原料,在锌粉的作用下反应合成乙酰苯胺的方法。同时对影响收率诸因素进行了考察,确定了最佳反应条件:反应温度为100℃、微波功率为400 W、辐射时间为15 min、原料配比为1∶2.5时,乙酰苯胺的收率也从常规加热反应的55%提升到了70%左右。缩短了反应时间,提高了反应速率和收率。     

Completion time variance minimisation on two identical parallel processors

The problem of scheduling jobs to minimise completion time variance (CTV) is a well-known problem in scheduling research. CTV is categorized as a non-regular performance measure and its value may decrease by increasing the job completion times. This objective is relevant in situations where providing uniform service to customers is important, and is in-line with just-in-time philosophy. The problem concerned in this paper is to schedule n jobs on two identical parallel machines to minimise CTV. We consider the unrestricted version of the problem. The problem is said to be restricted when a machine is not allowed to remain idle when jobs are available for processing. It may be necessary to delay the start of job processing on a machine in order to reduce the completion time deviations. This gives rise to the unrestricted version of the problem. We discuss several properties of an optimal schedule to the problem. In this paper, we develop a lower bound on CTV for a known partial schedule and propose a branch and bound algorithm to solve the problem. Optimal solutions are obtained and results are reported.     

A new (3,8)-connected pillared-layer lanthanide–organic framework with interconnected channel and mesoporous cage

A novel non-interpenetrated lanthanide–organic framework constructed by dinuclear cerium cluster as pillar and trinuclear cerium cluster as layer with a uniform (3,8)-connected topology has been reported, which exhibits mesoporous cages between layers and 3D interconnected channels.     

Function projective synchronization of complex networks with asymmetric coupling via adaptive and pinning feedback control

The problem on function projective synchronization (FPS) is investigated for complex networks via hybrid control. In contrast to existing works, the asymmetric coupling matrix was considered. Based on adaptive and pinning feedback control methods, new FPS criteria are proposed. Finally, three examples are provided to illustrate the effectiveness of the proposed methods.     

酒曲中产香微生物的筛选及其生长特性研究

试验以酯化酶活力、总酯含量和代谢产物丰富度为指标,于酒曲中分离得到的62株真菌中筛选出优良产香微生物。结果表明:酵母Njsys-YT3和霉菌Njsys-MD45都具有较高的酯化酶活力和酯合成能力,且能产生丰富的代谢产物。Njsys-YT3的酯化酶活力为16.58 U/mL,总酯含量为0.22%;Njsys-MD45的酯化酶活力为7.18U/mL,总酯含量为0.14%。通过对Njsys-YT3和Njsys-MD45生长特性的研究表明:Njsys-YT3和Njsys-MD45能够在酒精浓度12.5%,温度36℃,pH分别为3.2和3.6的条件下生长,具有较高的抗逆耐受能力。     

Evaluation of furosine,lactulose and acid-soluble β-lactoglobulin as time temperature integrators for whipping cream samples at retail in Austria

Three heat load indicators, i.e., furosine, lactulose and acid-soluble β-lactoglobulin, were determined in whipping cream samples purchased from Austrian market (n = 33), as well as commercial samples obtained directly from one Austrian dairy company (one brand, n = 25). Furosine contents were 47.8 ± 14.0, 72.2 ± 36.6, and 172.5 ± 17.7 mg 100 g⁻¹ protein, and β-lactoglobulin contents were 143 ± 91, 195 ± 150, and 89 ± 31 mg L⁻¹ for retailed pasteurised, extended shelf life (ESL), and ultra-high temperature (UHT) cream samples, respectively. Lactulose concentrations (analysed enzymatically) were 29 ± 10, 56 ± 41, and 201 ± 24 mg L⁻¹ for pasteurised, ESL and UHT cream samples, respectively. Linear correlation obtained for furosine and lactulose concentrations indicated that these indicators can reliably assess the heat load of pasteurised, ESL and UHT cream samples, whereas β-lactoglobulin was definitely not appropriate to discriminate between these heating categories.     

关于型钢混凝土梁结构设计的浅析

介绍了型钢混凝土结构的特点及计算方法．重点介绍了采用强度叠加法进行型钢混凝土梁的承载力计算以及变形和宽度验算的过程。     

Syntheses,structures and luminescent properties of two new two-fold interpenetrating 2D coordination polymers based on 4′-(4-carboxyphenyl)-4,2′:6′,4″-terpyridine

Two new coordination polymers, [Zn₂(cptpy)₂Cl₂]_n·0.5nH₂O (1) and [Cd₂(cptpy)₄]_n·3.5nH₂O (2) (Hcptpy = 4′-(4-carboxyphenyl)-4,2′:6′,4″-terpyridine), were synthesized under hydrothermal conditions and characterized by elemental analysis, IR and single crystal X-ray diffraction. Compound 1 shows a new two-fold interpenetrating 3-connected 2D framework with the hcb topological net and the Schläfli symbol of 6³. Compound 2 displays a two-fold interpenetrating (4,4)-connected 2D framework with the sql topological net and the Schläfli symbol of {4⁴ · 6²}. Interestingly, compounds 1 and 2 were obtained in the similar reaction conditions. The structural diversity of compounds 1 and 2 may illustrate the marked effect of the metal ion of the reaction solution. Additionally, photoluminescence properties of compounds 1–2 have been investigated.     

The electronic structure of Ni-phthalocyanine/metal interfaces studied by X-ray and ultraviolet photoelectron spectroscopy

Nickel phthalocyanine (NiPc) thin films were grown stepwise on polycrystalline gold and silver substrates and the formed interfaces were characterized by X-ray and ultraviolet photoelectron spectroscopies (XPS, UPS). The variation of the XPS core level binding energy with NiPc film thickness yields information about band bending and interface dipoles. The valence band structure of the NiPc thin films was determined by UPS and exhibits four main features at binding energies 1.50 eV, 3.80 eV, 6.60 eV and 8.85 eV, respectively. The NiPc highest occupied molecular orbital (HOMO) cut-off was measured at ∼1.00 eV from the analyzer Fermi level and from the measured work function change of the growing NiPc film a final work function value for NiPc was estimated at 3.90 ± 0.10 eV. The main C1s peak of the NiPc film (∼5.0 nm) consists of two components at 284.8 eV (C–C bonds), 286.2 eV (C–N bonds) reflecting photoemission from multiple carbon sites within the molecule and a satellite at 287.9 eV, whereas the Ni2p and N1s peaks appear at ∼855.9 eV and ∼399.3 eV, respectively and are due to Ni–N bonds. The energy level diagrams of the NiPc/Au and NiPc/Ag interfaces were determined from a combination of the XPS and UPS results, yielding a hole injection barrier of 0.90 ± 0.10 eV for both substrates.     

大型机电设备电气参数监测与故障诊断装置

提出采用实时在线监测电气参数方法,并结合物联网、WIFI无线通信、VC编程与数据库管理等多种技术,研制出物联大型机电设备电气参数实时检测与故障动态诊断装置,以实现机电设备电气参数的实时在线监测、故障动态诊断、预警以及设备与故障诊断中心间的双向无线操作。实践表明,本装置能有效避免故障发生,减少故障停机损失,并为"预知维修"提供技术保障。