4种电力衍生产品定价方法分析

随着电力市场的出现,电力衍生产品逐步成为电力交易的主要形式之一。由于电力不能大规模储存,作为现代金融工程理论核心的无套利定价原理对大多数电力衍生产品定价不再适用。文中采用Black-76公式和仿射跳跃-扩散电价模型研究了电力期货／远期、期货期权、单点期权以及摇摆期权等奇异期权的定价问题,提出了一种新的电力衍生产品风险中性概率框架,并根据德国EEX电力市场实际价格,利用解析及Monte Carlo方法给出了若干常见电力衍生产品的实际定价算例。计算表明,所提出的电力衍生产品定价方法具有完备的理论基础,能够解决各类常见电力衍生产品定价问题。     

国际一号码（POCSAG码）的接收及软件实现

利用寻呼接收机,移动电话实行特种服务越来越方便,传送的信息是国际一号码,实际应用中,国际一号码的接收,解码,显示主要利用硬件电路实现,该文从使用的角度阐述了寻呼发射台发射的国际一号码（POCSAG码）的编码格式,码字结构,各种地址码,信息码的编码方式,从经济指标入手,主要利用软件配以简单的硬件电路实现国际一号码的接收,解码纠错和显示。给出了国际一号码的硬件接收电路以及定时接收信息流的软件流程框图。     

As-extruded AZ31B magnesium alloy fatigue crack propagation behavior

The fatigue crack propagation rate of as-extruded AZ31B magnesium alloy was studied. Compact tension [C(T)] of the notch direction parallel (T-L), vertical (L-T), and inclined at 45o to the extrusion direction was investigated. The experimental results indicate that the crack propagation direction is parallel to the extrusion direction for T-L and L-T specimens, whereas the specimen inclined at 45o has an angular deflection of 9° to 11° toward the extrusion direction. The T-L specimen has the fastest fatigue crack propagation rate, and the L-T specimen has the slowest rate, the fatigue crack propagation rate of the specimen inclined at 45o is between the two directions. The crack tip propagates by both transgranular and intergranular fractures. Fatigue fractures consist of cleavage plane or quasi-cleavage and are brittle fractures. The fatigue striation occurs for specimens inclined at 45o and its size is 3-15 μm.     

220GUZ31型铁塔专用横担侧边卡具装置的研制

通过研制220GUZ31型铁塔专用横担侧边卡具装置,实现220GUZ31型铁塔双分裂导线架设方式双悬垂绝缘子串带电更换。该套卡具装置由220GUZ31型铁塔专用横担侧边卡具和连接调节器及软质绝缘绳钩3个部分组成。文中研究解决方案,制作出整套卡具装置,并在输电线路220GUZ31型铁塔上投入使用,验证该套卡具装置的安全性和实用性。     

Investigation of multidrug resistance in cultured human renal cell carcinoma cells by 31P-NMR spectroscopy and treatment survival assays

KTCTL-26 and KTCTL-2 are renal cell carcinoma (RCC) lines with high and lowexpression of P-170 glycoprotein, respectively. Inherent differences between the two cell lines in terms of phosphate metabolites and growth characteristics in culture were examined for possible association with multidrug resistance (MDR). Differences in response to drug treatment were investigated for 40 h incubations with various doses of vinblastine (VBL) alone or as cotreatments with various concentrations of the calcium antagonist diltiazem (DIL) and/or interferon–α (IFN-α). Treatment effects were quantitated using the MTT survival assay and ³¹P magnetic resonance spectroscopy (MRS) to determine phosphate metabolite profiles in intact cells. KTCTL-2 and KTCTL-26 cells exhibited significant inherent differences in phosphocholine, glycerophosphocholine, glycerophosphoethanolamine, and phosphocreatine levels. KTCTL-26 cells were more sensitive than KTCTL-2 to 0.011μM VBL alone (87% vs. 102% survival) or to 0.011μM BL + 10μM DIL (55% vs. 80% survival). The latter treatment resulted in a significant decrease in the ratio of phosphocholine to glycerophosphocholine in KTCTL-26 cells but no significant changes in phosphate metabolites in KTCTL-2 cells. Metabolomic ³¹P MRS detects different metabolite profiles for RCC cell lines with different MDR phenotypes and may be useful for noninvasive characterization of tumors in a clinical setting.This revised version was published online in August 2005 with a corrected sequence of authors.     

A Study of Evolution of Structural Parameters of PZT-Based Ferrosoft Ceramics in the Vicinity of Transition to a Paraelectric Phase

The peculiarities of structural changes of the material were investigated in the temperature range from 20 to 280°C. Electroelastic parameters: the frequency constant of radial vibrations N _r and the piezoelectric modulus d ₃₁ of the preposed sample and the poled sample being in a 1 kV/cm dc electric field were studied. It has been established that the electric field increases a temperature stability of structure of ferroelectric domains.     

轧制AZ31镁合金板材的显微组织和力学性能

以初始晶粒尺寸为250~300μm、20mm厚的铸态AZ31镁合金板坯为原材料,对比研究4种轧制方案对轧后板材显微组织和力学性能的影响。结果表明,4种方案终轧板材的平均晶粒尺寸依次为5μm、18μm、6.5μm和4.5μm,抗拉强度均大于250 MPa,屈服强度均大于140MPa,延伸率均大于20%。其中最佳方案制得了高塑性镁合金板材,抗拉强度为265MPa,屈服强度为186MPa,延伸率达29%,同时,板材沿横向、轧向和45°方向的性能相差较小,各向异性不显著。     

基于塘子凹31-1#矿体的采场地压及位移监测研究

运用MKⅡ型收敛仪和MC型钻孔应力计对云锡塘子凹31－1^#矿体进行现场收敛及应力量测，得出了一些有价值的结论。这些结论为该矿体的采矿优化提供了理论支持，同时为其它矿山提供技术借鉴，也验证了现场量测量在矿山开采中的重要性。     

Sensitivity Investigation of SW-B80N80 Nanotube to Polychlorinated Biphenyl-153 (PCB-153): DFT Methods

Polychlorinated biphenyls (PCBs) is one of the most persistent organic pollutants that exist in the atmosphere and can be concentrated in lithosphere and hydrosphere. Because of low biodegradability and lipophilicity, PCBs accumulate in fatty tissues and through oxidative stress could lead to cancers and central nervous system disorders. Currently, degradation of these synthetic pollutants is one of the environmental issues. The aim of this study is to provide a sensor for detection of PCB-153 (PCB-153). Nano boron nitride compounds (B_nN_m) are magic materials with high stability that can be used as a sensor for detection of chlorinated aromatic compounds. In this study, sensitivity of B₈₀N₈₀ as a form of single-walled boron nitride nanotubes (SW-B₈₀N₈₀ nanotube (8,8)) to PCB-153 has been investigated. The PCB-153 is closed to the SW-B₈₀N₈₀ nanotube and electron exchanges between them have been evaluated using density functional calculations by B3LYP/6–31G^* method. The calculation of the electronic properties has shown that SW-B₈₀N₈₀ nanotube is very sensitive to the presence of PCB-153 molecules. The HOMO/LUMO and gap energy (E_g) changes were considerable. Gap energy decreased from 4.214 eV to 2.022 eV during the formation of complex PCB-153-SW-B₈₀N₈₀ nanotube that leads to conversion of PCB-153 into the other products. According to thermodynamic parameter calculation through the IR-DFT method, it is expected that SW-B₈₀N₈₀ nanotube will be a suitable candidate in the elimination of PCB-153, as well as a gas sensor.     

乙二胺四乙酸对镁合金阳极氧化膜的影响

将AZ31镁合金在NaOH、Na2SiO3和Na2B4O7的电解液中进行阳极氧化,考察了乙二胺四乙酸添加剂对阳极氧化膜性能的影响。用扫描电镜观察阳极氧化膜形貌,用X-射线衍射和自带能谱仪对膜层的相组织和元素含量进行分析,用交流阻抗测试氧化膜的耐蚀性能。结果表明,氧化膜主要由Mg O组成,膜层中出现了乙二胺四乙酸的特征元素C和N,Mg Si O3的衍射峰受到抑制。阳极氧化过程中的起弧电压随乙二胺四乙酸含量的增加呈上升的变化趋势。随着乙二胺四乙酸含量的增加,膜层耐蚀性先提高后降低。乙二胺四乙酸质量浓度为7.5 g/L时氧化膜具有最大的阻抗,最优的耐蚀性能。