港口供应链物流能力影响因素及其协调策略研究

随着全球经济一体化的加快进展,港口企业在物流服务中的作用越来越突出.将供应链的相关思想应用于港口业的发展,并把供应链管理理论运用于港口物流管理的实践,据此加强港口供应链管理的研究,已成为港口企业提升自身核心竞争力的重要战略.首先对港口供应链的现有模式及发展趋势进行了分析,继而对港口供应链物流能力的内外部影响因素展开详细剖析,并通过对其实施评价寻求提升港口企业核心竞争力的途径,最终提出促进港口供应链有效运作与协调发展的相关策略.     

轴向柱塞泵配流副低压区织构化试验研究

摘要为研究低压区织构化轴向柱塞泵配流副的摩擦磨损性能,设计了配流副的摩擦磨损试验机,对织构化配流副进行了试验研究,并与无织构配流副的摩擦磨损情况进行对比．研究结果表明：低压区织构化的配流副能够有效减小摩擦系数,最大减摩率可达29．11％;低压区织构化的配流副比无织构的平均磨损体积要小,且整个摩擦面磨损较为均匀,降低了配流副的偏磨．初步磨损试验表明：平均磨损体积量对表面织构面积率和直径较为敏感,最小平均磨损体积量出现在微凹坑直径100~200μm范围内．     

港口高杆灯智能控制系统的设计与实现

设计了一种基于单片机的港口高杆灯智能控制系统．该系统能根据港口所在地的经纬度和日期,自动计算当地每天日出日落的时间,从而实现高杆灯自动定时开关;应用GSM模块与单片机通信,通过短信实现对高杆灯的手动控制．实际运行证明了系统稳定且可靠．     

SHOCK AND BOUNDARY STRUCTURE FORMATION BY SPECTRAL-LAGRANGIAN METHODS FOR THE INHOMOGENEOUS BOLTZMANN TRANSPORT EQUATION

The numerical approximation of the Spectral-Lagrangian scheme developed by the authors in [30] for a wide range of homogeneous non-linear Boltzmann type equations is extended to the space inhomogeneous case and several shock problems are benchmark. Recognizing that the Boltzmann equation is an important tool in the analysis of formation of shock and boundary layer structures, we present the computational algorithm in Section 3.3 and perform a numerical study case in shock tube geometries well modeled in for ID in x times 3D in v in Section 4. The classic Riemann problem is numerically analyzed for Knudsen numbers close to continuum. The shock tube problem of Aoki et al [2], where the wall temperature is suddenly increased or decreased, is also studied. We consider the problem of heat transfer between two parallel plates with diffusive boundary conditions for a range of Knudsen numbers from close to continuum to a highly rarefied state. Finally, the classical infinite shock tube problem that generates a non-moving shock wave is studied. The point worth noting in this example is that the flow in the final case turns from a supersonic flow to a subsonic flow across the shock.     

基于FPGA的电子秒表的设计与实现

文章介绍了基于FPGA进行的电子秒表的设计.首先介绍了总体设计方案,接着分别从顶层文件设计和子模块设计两方面详细介绍了设计过程,最后对用硬件描述语言编程仿真中应该注意的问题做了一个小结.     

Hydrogen Bonded 3D Molecular Self Assembly Constructed from [(Ni(nicotinamide)2(thiocyanate)2(H2O)2] Complex Showing Spin Canted Anti-ferromagnetic Character

A new three-dimensional nickel(Ⅱ) hydrogen-bonded molecular self assembly containing [(Ni(nicotinamide)2(thiocyanate)2(H2O)2] complex has been synthesized and characterized by single-crystal X-ray diffraction,FTIR spectroscopy,thermal analysis and magnetic measurements.Structural analysis reveals that the complex crystallizes in triclinic space group P1(crystal data a = 7.5574,b = 8.2683,c = 9.0056 ?,α = 73.010,β = 69.698,γ = 66.51) and exhibits a distorted octahedral coordination sphere.Most interesting point in its structure is the involvement of sulphur atom of thiocyanate moiety in the trifurcated hydrogen bonding to build up the hydrogen-bonded self assembly.The magnetic behavior as determined by squid magnetometer(2~300 K temp.range) reveals dominating antiferromagnetic interaction followed by spin canting behavior below 20 K.     

Effect of hydrogen‐bonded interactions on the energetics and spectral properties of the astromolecule aminoacetonitrile

A detailed and systematic electronic structure calculation has been performed to analyze the hydrogen‐bonded interaction of aminoacetonitrile (H₂NCH₂CN) with hydrogen cyanide (HCN) and Glycine (H₂NCH₂COOH). Both HCN and aminoacetonitrile have already been detected in the interstellar medium (ISM) and their active role in the molecular mechanisms of glycine production has already been recognized. Four different density functional models have been used to study the effect of hydrogen bond formation on the energetic stability and vibrational spectra of the aminoacetonitrile‐HCN and aminoacetonitrile‐glycine complexes in gas phase. The aminoacetonitrile‐glycine dimer is energetically far more stable than all forms of aminoacetonitrile‐HCN dimers. Elastic and inelastic scattering of light off the hydrogen‐bonded clusters have been investigated in details via Rayleigh and Raman spectroscopic parameters. The dipole moments and depolarization ratios are found to be sensitive on the type of hydrogen‐bond network. The mean polarizabilty show appreciable dependence on the choice of the DFT‐model. In general, all the chemical groups (OH, CN, NH₂, and CH) that participate directly in the hydrogen bond formation suffer appreciable variation in the intensity of vibration.     

Fuzzy综合评判在福建沿海港口等级划分中的应用

本文采用特尔菲法决定港口等级评价因子,并采用AHP方法决定各因子的权重,最后应用Fuzzy综合评判方法对福建沿海港口进行等级划分,得出了福建省48个年吞吐量在万吨以上的大小港口的等级,并对划分结果进行了分析。     

用HDD工艺制备各向同性NdFeB磁粉和粘结磁体

本文应用HDD工艺制备了各向同性的NdFeB磁粉,对磁粉进行了X光衍射分析,并用这种磁粉制备了磁性能为iH_c=896 kA/m, B_r=0.51 T, (BH)_(max)=44 kJ/m~3的各向同性粘结磁体。     

红外光谱定量分析法研究醇在四氯化碳中的氢键缔合作用

对醇在CCl_4稀溶液中的红外光谱进行了图谱解析,研究醇在惰性溶剂稀溶液中的各种氢键缔合状态,推测了它们的结构及分布.根据有关文献分析,结合图谱解析,提出一个改进的醇的缔合模型.计算了有关的自缔常数。对所得结果进行了分析讨论。