淮盐文化线路的判别与梳理

横跨古淮河尾闾南北、南至长江口、北到赣榆县的两淮海盐产区,是我国历史上最为悠久的海盐产区之一,在相当长一段时期内也是我国产量最高、规模最大的盐区,所以才有"天下盐利淮为大"的说法。从文化线路的视角,分别对文化线路应具备的时间指标、空间指标和文化功能指标这三个要素进行分析,阐述淮盐文化遗产满足文化线路遗产判别的基本要求,其具备较高的资源价值、遗产价值和旅游价值。     

两性聚丙烯酰胺的合成方法及应用进展

结合国内外研究情况，从技术路线和实施方法两个角度着重阐述了制备两性聚丙烯酰胺的方法，同时简单介绍了其应用情况，并对今后的研究工作提出了一些建议。     

氮化铝镓纳米固体材料的合成及其拉曼光谱

利用氨热法合成了AlxGa1-xN合金的纳米固体，其中Al含量的摩尔数可在x＝0－1的范围内变化，在x值从0到1整个范围内，对该合金的纳米固体进行了激光Raman光谱分析，证实了A1（LO）声子的模式行为和E2声子的的双模式行为，从实验现象中还可以推断出A1（TO）声子可能具有单模式行为，A1（LO）声子频率在x＝0－0．5范围内迅速单调增加，当x＞5时则缓慢增加，这可能是由于纳米颗粒之间的相互作用造成的，对于A1（TO），T1（LO），和E2（GaN）声子模式，其线宽在x＝0．5时达到最大值。     

Cruise missile multiple routes planning based on hybrid particle swarm optimization

In order to solve cruise missile route planning problem for low-altitude penetration,a hybrid particle swarm optimization( HPSO) algorithm is proposed. Firstly,K-means clustering algorithm is applied to divide the particle swarm into multiple isolated sub-populations,then niche algorithm is adopted to make all particles independently search for optimal values in their own sub-populations. Finally simulated annealing( SA) algorithm is introduced to avoid the weakness of PSO algorithm,which can easily be trapped into the local optimum in the search process. The optimal value obtained by every sub-population search corresponds to an optimal route,multiple different optimal routes are provided for cruise missile. Simulation results show that the HPSO algorithm has a fast convergence rate,and the planned routes have flat ballisticpaths and short ranges which meet the lowaltitude penetration requirements.     

浅析CDMA山区及交通干线覆盖方案

文章结合不同的用户分布和山区丘陵地形的特点进行站址选择和设备选型的分析,通过系统仿真来比较高山站与平地站的覆盖范围,综合考虑覆盖目标、建设成本和投资收益对二者进行取舍。直放站和射频拉远(RRU)是山区交通干线优化时的主力军,着重分析直放站对施主基站低噪抬升的影响。     

A NEW APPROACH FOR THE CLASSIFICATION AND ENUMERATION OF UNIQUE REACTION ROUTES AND UNIQUE OVERALL REACTIONS IN MULTIPLE CHEMICAL REACTION SYSTEMS

The methodology of response reactions (RERs) introduced earlier from thermodynamic and kinetic considerations is used in this work to develop a new algorithm for the classification and enumeration of unique/direct reaction routes (RRs) and overall reactions (ORs). According to the RERs approach, a unique set of both RRs and ORs may be generated starting from any conceivable set of linearly independent RRs and ORs. In particular, the direct ORs may be most conveniently enumerated starting from the formula matrix of the terminal species (reactants and products), i.e., without any relation to the elementary reactions comprising the detailed mechanism. Depending on the type of ORs produced by the RRs one can distinguish between two distinct types of direct RRs. Namely, one option is to define a direct RR by specifying the intermediate species that need to be eliminated. This type of RR is referred to as Milner RRs. The other option is to require the direct RRs to produce RERs, thus resulting in RRs referred to as Happel-Sellers RRs.     

Synthesis of fine-grain Ba0.96La0.04TiO3 dielectric ceramics by different routes for multilayer ceramic capacitors

Spherical Ba_0.96La_0.04TiO₃ powders were synthesized by a wet chemical method-based on a precipitation process, able of controlling uniformity and particle size. After sintering, fine-grain Ba_0.96La_0.04TiO₃ ceramics with good dielectric properties were obtained. Different synthesis routes of Ba_0.96La_0.04TiO₃ ceramics were used, and their effects on microstructure and dielectric properties were examined. Results showed that the ceramics samples prepared by La³⁺ and Ba²⁺ added together (abbreviated as, BLT-T) resulted in a mixture of large and small grains, sharp permittivity peaks, and high dielectrics loss. By comparison, another ceramics samples prepared by La³⁺ and Ba²⁺ added separately (BLT-S) exhibited uniform grain size and broadened/flattened permittivity peaks. The high value of ε_r (3255) and low tan δ (0.01) at room temperature and negligible temperature coefficient of capacitance from − 35 to 85 °C suggested the suitability of the above materials for multilayer capacitor applications.     

干燥方式对NaY(WO4)2∶Dy3+,Eu3+荧光粉粒度及上转换发光性能的影响

采用水热法合成了Dy3+和Eu3+共掺杂的NaY(WO4)2上转换荧光粉,用XRD, SEM和荧光光谱(PL)等方法对不同干燥方式所得样品的晶体结构、微观形貌、晶粒尺寸及上转换发光性能进行了分析。结果表明,合成样品均为四方白钨矿结构的NaY(WO4)2,空间群为I41/a,掺入Dy3+和Eu3+未改变基质晶格;常规干燥、喷雾干燥、冷冻干燥及真空干燥后荧光粉的尺寸分别为817.91, 486.04, 388.74和349.82 nm,真空干燥的样品分散性最好。在793 nm近红外光激发下,冷冻干燥样品的上转换发光性能最佳,与干燥过程中粉体团聚程度减弱及表面层缺陷减少有关。576 nm处的黄光发射峰来自Dy3+的4F9/2→6H13/2跃迁,595 nm处的橙光、616和655 nm处的红光发射峰分别归属于Eu3+的5D0→7F1, 5D0→7F2和5D0→7F3跃迁。荧光粉的CIE色坐标均位于红光区,表现出良好的红光发射特性,在发光二极管和彩色显示等光电领域具有潜在应用价值。     

1,3-丙二醇生产方法及用途

本文介绍并比较了 1,3-丙二醇的生产方法。在环氧乙烷法、丙烯醛法和生物技术法三种有工业应用前景的生产方法中 ,环氧乙烷法比丙烯醛法更有竞争力 ,生物技术法在国外是很有吸引力的路线 ,但国内由于农产品的价格偏高降低了该路线的竞争力。本文也简要介绍了 1,3-丙二醇的用途     

数控加工中零件淬火后阵列精孔的加工方法

淬火后的材料硬度很高,加工很难到位,对刀具的磨损较大,尤其对于精度高,数量多的阵列孔,要想保证孔径和孔间距达到公差要求需要在加工工艺和刀具的选择上合理安排。