Research on New Methods of Improving Microwave Oven Heating Uniformity

随着社会进步和微波能利用技术的发展，微波炉的使用越来越普及。因微波具有良好的穿透性，能直接将微波能量送入被加热物体内部，实现了对物品内部和外部同时加热，因而极大地缩短了加热时间，提高了加热效率。此外，微波加热食品既不产生油烟、一氧化碳等有害物质，又能够最大限度地不破坏食品的营养成分，真正体现了现代人健康饮食的理念。 本文介绍了微波炉的发展过程，突出了传统微波炉加热不均的缺点及现用的常规克服方法：一种是在微波炉加热腔底部放置由电机带动旋转的食品托盘，另一种是在微波炉加热腔顶部放置由电机带动旋转的场搅拌器。此两种方法能在一定程度上克服微波炉加热的不均匀性，但都需要在微波炉加热腔中放置额外器件，给...Along with social progress and continuous improvement of microwave energy utilization technologies, the use of microwave ovens is becoming increasingly popular. Because of the good penetrability of microwave, microwave energy can be sent into the objects directly, and food can be heated from both internal and external. Thus, the heating time is greatly reduced and the heating efficiency is improve...学位：理学硕士院系专业：物理与机电工程学院物理学系_无线电物理学号：1982008115301

Automatic Measurement Method of the Resonant Frequency of Cylindrical Dielectric Resonator with Holes

从求解MAXWEll方程本征值出发,采用MATlAb中PdE工具箱,借助可二维作图的开槽圆柱谐振器,计算出有孔圆柱介质谐振器的谐振频率。求解结果与矢量网络分析仪测量结果吻合,误差在千分之四以内。且该有限元法计算软件采用MATlAb编写,可方便地被调用于矢量网络分析仪的VEE测试软件中,较好解决有孔及变形圆柱介质谐振器的设计、测量和微调等问题,特别是矢量网络分析仪的快速自动测量中。One method of calculating the resonant frequency of cylindrical dielectric resonant with holes is introduced.The method is based on the solution of eigenvalue of the Maxwell equation,and the resonant frequency of cylindrical dielectric resonant with holes is solved by applying the PDE tool box in the Matlab.Compared to the measurement results of the PNA,the error of the method is not more than 0.4%.The numerical method can be programmed by Matlab,and then can be applied conveniently in the test software VEE of the PNA.Thus,the complementary advantages of the method are very beneficial for the design of the resonant frequency of cylindrical dielectric resonant with holes and the deformation cylindrical dielectric resonant,and also can be used for solving many other problems,such as online automatic measurement of the resonant frequency of cylindrical dielectric resonant with holes and the deformation cylindrical dielectric resonant.福建省自然科学基金资助项目(2008J0031

Fast and New Measurement System of Temperature Coefficient for Open Dielectric Resonator

谐振频率温度系数是微波介质陶瓷材料的重要性能参数之一,文中提出了一种微波介质谐振器温度系数的新型快速检测方法,并介绍了系统的测试原理、电路结构和软件组成。该系统对微波陶瓷材料温度系数进行测量时,所产生的系统误差、人为误差最小,可实现精确和快速检测。Resonant frequency temperature coefficient is an important property parameter of the microwave dielectric ceramic materials, a fast and new measurement system for temperature coefficient of microwave dielectric resonator is presented. The principle and circuits as well as,software of measurement system is introduced. It is shown that the system has low system error and man-made error, and can measure the temperature coefficient of microwave ceramic materials accurately and fast.国家863计划资助项目(2001AA325100);; 福建省自然科学基金计划资助项目(J0650016

ZnNi/HZSM-5催化剂上混合C_4烃的芳构化反应

考察了ZnNi/HZSM 5催化剂制备方法和反应条件对混合C4烃芳构化反应的影响 ,并探讨了反应机理。结果表明 :(1)在ZnNi/HZSM 5催化剂制备过程中 ,采用先浸渍Zn2 + 后浸渍Ni2 + 的方法可以获得性能好的催化剂 ;(2 )混合C4烃在ZnNi/HZSM 5上的芳构化反应有最佳温度范围 ,在该温度范围内可以获得高的BTX的收率及选择性 ;(3)低的质量空速有利于芳构化反应 ,空速升高会因催化剂结焦而使BTX的收率及选择性下降 ;(4)在优化的反应温度 5 2 0～ 5 4 0℃、质量空速 1 0h-1,以及常压非临氢的条件下连续反应 6h ,芳烃收率平均值为 4 5 %～ 5 6 % ,BTX收率达 4 0 %～ 4 6 % ,液态烃中芳烃含量达 97%～ 99%

轻质烃在双功能ZnNi/HZSM-5催化剂上的芳构化

考察了混合碳四烃、石油液化气和正己烷在双功能ZnNi/HZSM -5催化剂上的芳构化 ,同时首次将微波辐射技术应用到芳构化中 ,并分别研究了混合碳四烃和正己烷在两种加热方式下的芳构化催化行

微波诱导催化轻质烃芳构化

研究了在常规加热和微波辐射两种不同加热方式下ZnNi/HZSM 5催化剂上混合碳四烃及正己烷芳构化反应的性能 .考察了高 /径比、反应温度及反应时间对反应性能的影响 .探讨了微波辐射诱导催化反应的作用机理

Synthesis and Crystal Structure of Porous Zinc(Ⅱ) Coordination Polymer{[Zn(L)_2(H_2O)_2]·H_2O}_n Constructed by Isonicotinoylhydrazone Ligand

以邻甲酰基苯磺酸钠和异烟肼为原料在乙醇/水溶液中制备了一种酰腙类SCHIff碱配体(nAl),采用常规溶液挥发法合成了由该配体构筑的zn((Ⅱ)配位聚合物{[zn(l)2(H2O)2]·4H2O}n。利用元素分析、Ir、TgA和X-射线单晶衍射分析对配合物进行了表征。配合物晶体属三斜晶系,P1空间群,晶胞参数A=0.786 98(4)nM,b=0.869 26(5)nM,C=1.180 44(7)nM,α=103.353(5)°,β=100.965(4)°,γ=93.123(4)°,z=1,V=0.767 24(7)nM3,dC=1.697 g·CM-3。每个zn(Ⅱ)离子被2个配体l-阴离子双重桥联形成二核环状结构单元,并通过共用锌离子形成一维链配位聚合物,链与链之间通过氢键扩展为具有一维开放孔道的三维超分子网络结构。An acylhydrazone-type Schiff base ligand(NaL) was synthesized by reaction of sodium 2-formylbenzene sulfonate with isoniazide in a mixture of ethanol and water.A Zn(Ⅱ) coordination polymer {[Zn(L)2(H2O)2]·4H2O}n have been synthesized by employing the solution preparation method at room temperature and characterized by elemental analysis,IR,TGA and X-ray diffraction structural analysis.Crystal data:triclinic system,space group P1,a=0.786 98(4) nm,b=0.869 26(5) nm,c=1.180 44(7) nm,α=103.353(5)°,β=100.965(4)°,γ=93.123(4)°,Z=1,V =0.767 24(7) nm3,Dc=1.697 g·cm-3.Each Zn (Ⅱ) ion is bridged by two L-ligands in the monodentatemonodentate mode to form a ring-like dimer units,and a one-dimensional chain is built by sharing a Zn (Ⅱ) ion between the units.The adjacent chains are linked into a 3D supramolecular network structure via hydrogen bonds and π-π interactions with a 1D open channel that are occupied by solvent molecules.CCDC:934292.泉州师范学院学科建设资金; 国家级大学生创新创业训练计划项目(No.201310399018)资

Breeding high-yield oil-producing strain to use cheap carbon source by UV induced protoplast mutagenesis

【目的】研究并建立利用原生质体紫外诱变技术选育可利用廉价碳源发酵的高产油新菌株的方法。【方法】采用1.5%蜗牛酶和1.0%纤维素酶混合液水解去除细胞壁得到2A00015(近平滑假丝酵母,CAndIdA PArAPSIlOSIS)的原生质体,将其放于紫外灯下诱变及再生壁培养,筛选获得可利用廉价碳源发酵的高产油酵母,并采用气相色谱质谱联用法(gC-MS)测定其脂肪酸组成。【结果】突变效果最好的突变菌株2A00015/25用葡萄糖发酵培养7 d后,其生物量、油脂产率和产油量分别为17.77 g/l、58.12%和10.32 g/l,较原始菌株分别提高了12.45%、23.32%和38.68%;利用废糖蜜发酵培养,其生物量、油脂产率和产油量分别为18.54 g/l、49.44%和9.17 g/l,较原始菌株分别提高了9.09%、21.16%和32.18%。利用废糖蜜培养其产油效率虽低于利用葡萄糖培养,但从环境保护及原材料成本的角度考虑,用废糖蜜作为碳源发酵培养产生油脂更具优势。诱变菌株利用废糖蜜发酵后产生油脂经检测含有8种脂肪酸,其脂肪酸组成与植物油近似,其中不饱和脂肪酸含量占脂肪酸总量的82.4%。【结论】通过利用原生质体紫外诱变技术,成功选育出一株新的可利用廉价碳源的高产油海洋菌株,产油率达到49.4%,提高了21.2%。[Objective] We used UV induced protoplast mutagenesis to study breed a new high-yielding lipid-producing strain which could use cheap carbon source.[Methods] Get the 1.5% glusulase and 1.0% cellulose solution.Hydrolyze to remove the cell wall and obtain the protoplast of 2A00015(Candida parapsilosis).Put it under the ultraviolet lamp for mutagenesis and cultivate regenrated wall.Then screen to get the high oil generated yeast which could be fermented by low-cost carbon source.Determine its fat acid components by gas chromatography with mass spectrometric(GC-MS).[Results] Cultivated the mutant strain with best mutation 2A00015/25 in the glucose.We found that the biomass, oil yield rate and oil production are separately 17.77 g/L, 58.12% and 10.32 g/L, which are separately 12.45%, 23.32% and 38.68% higher than the original strain.We have also cultivated the mutant strain in the waste molasses and found the biomass, oil yield rate and oil production are separately 18.54 g/L, 49.44% and 9.17 g/L, which are separately 9.09%, 21.16% and 32.18% higher than the original strain.The oil yield rate is lower in the waste molasses cultivation than that in glucose cultivation.However, in consideration of environment protection and cost of raw materials, the waste molasses is of much more advantages.It is tested that the fat generated from the waste molasses fermentation consists of eight kinds of fat acid.Its fat acid components are similar to the vegetable oil, in which the content of unsaturated fatty acid comprised 82.4% of the total fatty acid.[Conclusion] Basing on UV induced protoplast mutagenesis, we have successfully bred a new high-yielding oil strain which can make use of the low-cost carbon source, with its oil production rate 49.4% which has increased by 21.2%.深海(微)生物资源勘探与资源潜力评价项目(No.DY125-15-R-01

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In this paper，thr relationships between composi-tion,structure and soldering of bright tin electrode-posits were studied using the electrochemical methods,XPS．metallographic techniaues and positron annihila-tion lifetime spectroscopy. The influence of Co4+ and Sb(III) ion in tin baths，the growth of diffusionlayer of Cu-Sn alloy between doposited tin and copperbase and the soldering mochanism o...学位：理学硕士院系专业：化学化工学院化学系_物理化学(含化学物理)学号：SHAO00014