无穷维最优控制系统的N阶近似

讨论一类用无穷维系统方程描述的最优控制问题，把它看作为Ｈｉｌｂｅｒｔ空间上求算子方程的最小均方解的问题．在无穷维算子近似理论的基础上，用无穷矩阵奇异值分解方法得到无穷维最优控制问题解的形式，并研究这个解的有限维近似形式，建立一个有限的Ｎ阶最优控制系统，使得它的控制律与无穷维系统的控制之间误差最小     

三峡水库蓄水后消落带土壤有机质和氮磷含量及分布特征

2010年4月在三峡库区重庆段长江干流及部分支流的14个消落带采样点采集消落带土样,对有机质、全氮和全磷进行了测定,并对土壤的化学计量学特征进行了分析.结果表明,淹水过后消落带土壤有机质均值大于对照土壤.消落带植被覆盖状况对消落带土壤有机质和全氮含量变化影响较大,淹水前植被覆盖度高的消落带在落干初期土壤有机质和全氮含量高于对照土壤,而植被覆盖低的消落带土壤有机质和全氮低于对照土壤.消落带土壤全磷含量与植被覆盖度、土地利用类型均没有明显的关系.与对照土壤相比,消落带土壤C：N、C：P较大,N：P较小,消落带土样有机质和全氮含量呈现良好的线性拟合关系,表明两者有相同的来源.     

声速混合定则及生物媒质组份定征

研究各种声速混合定则的异同及对生物媒质组份定征的适用性.指出对于生物媒质组份定征,在一定条件下这些定则是兼容的;各种定则对实际声速模拟符合程度有不同的差别,尚不存在统一的、最佳模拟定则.     

Research on effects of hydrostatic pressure on the dielectric property of Pb(Zn<Subscript>1/3</Subscript>Nb<Subscript>2/3</Subscript>)O<Subscript>3−</Subscript>BaTiO<Subscript>3−</Subscript> PbTiO<Subscript>3</Subscript> relaxor ferroelectric ceramics

The dielectric properties of Pb(Zn1_1/3Nb_2/3)O₃₋ BaTiO₃₋PbTiO₃ relaxor ferroelectric ceramics near the rhombohedral and tetragonal phase boundary were investigated under hydrostatic pressure. It was found that hydrostatic pressure made their phase transition temperature T _c and the peak temperature T _m decreased, and the frequency dispersion and relaxor behavior enhanced. In these disorder systems of composite pervoskite structures, there appeared polar clusters or nanodomains. The unique physical characteristics, which made the relaxor behavior enhanced, is that the correlation length among these nanodomains decreases greatly with the pressure increasing.     

多DSP交换网络结构的研究与适配器的设计

摘要：简要介绍了软件无线电硬件电路实现的几种体系结构，并叙述了各种结构的优缺点．基于软件无线电的交换网络结构提出了一种改进结构，此改进结构具有很好的开放性、扩展性和可重构性，这种结构拓宽了软件无线电多处理器平台的应用范围，在民用和军用领域都具应用前景．最后给出了适配器模块的硬件构成与软件实现框图．     

大面积CVD金刚石膜的热铁板抛光

研制成功国内第1台大面积CVD金刚石膜热铁板抛光机,它可以在10^-3pa真空条件下,加热到1100℃;抛光台可以在0－10r/min间实现无级调速,一次完成3片φ110mm的金刚石膜的抛光,金刚石膜在980℃,2h抛光的结果表明该装置有良好的抛光效果。金刚石膜在980℃抛光不同时间的Raman谱表明,金刚石热铁板抛光是金刚石石墨化和C原子不断扩散的过程。     

非简谐振动对二维系统玻意耳线的影响

利用Collins模型,以氩为例,计算了在各种不同条件下二维系统的热力学函数.研究了二维系统在存在空位的情况下,原子不动、或平动、或作非简谐振动等情况的临界温度、玻意耳温度和玻意耳线等.所得的结果同由经验方程求得的结果相类似,与实际系统的实验值相近.     

Response of the northwestern Pacific upper water δ~(13)C to the last deglacial ventilation of the deep Southern Ocean

The deglacial δ~13C minimum events that originated from the ventilation of the deep Southern Ocean around Antarctica, have been recorded in a range of marine sediments from the southern to tropical oceans in late Pleistocene. However, the broad δ~13C minimum event was also reported as far as to the northern middle latitudes, in northwestern Pacific marginal sea areas, during the last deglaciation. In the northwestern Pacific, forcing from the northern high latitudes is strongly expressed, while the records of in- fluence from the southern high latitudes are few. The Kuroshio Source Region (KSR) forms a boundary between the northwestern Pacific and the southern, tropical Pacific. So, high-resolution planktonic foraminiferal records in core MD06-3054 from the KSR are well positioned to identify signals from the southern hemisphere in the northwestern Pacific. Planktonic foraminiferal tests from the upper 1030 cm of the core were subject to AMS14C, carbon and oxygen isotopic measurements. A negative excursion was found to occur from about 20.0-6.0 ka BP in δ~13C records of both surface (Globigerinoides ruber) and subsurface (Pulleni- atina obliquiloculata) dwellers, but the overall trends of the two curves have reversed since 26.5 ka BP. Moreover, the δ~13C rec- ord of G. ruber (the surface dweller) shows a robust link to the record of atmospheric CO2, and its changes precede the records of P. obliquiloculata (the subsurface dweller). According to the hydrologic conditions, the broad δ~13C minimum event recorded in the KSR is also a response to the increasing ventilation of the deep Southern Ocean around Antarctica during the last deglaciation. The inconsistency between the records of the surface and subsurface dwellers was possibly caused by the ways that the low δ~13C signal was transmitted. Subsurface water primarily received the low δ~13C signal from the Antarctic Intermediate Water (AAIW), whereas the surface water was probably mainly impacted by atmospheric CO2 in the KSR. The records from the KSR confirm the deduction that the broad δ~13C minimum event in the Okinawa Trough was due to the impact of tropical Pacific surface water dur- ing the last deglaciation, and suggest that signals from the southern high latitudes also can be delivered to the northern middle latitudes.     

含氟聚合物在赤磷基抗红外发烟剂中的应用

在实验室条件下利用多波段红外辐射仪，测试了含四种不同聚合物的赤磷发烟剂燃烧产生的烟雾在远红外波段的透过率，并使用粉尘取样仪测试了烟雾的质量，计算出了各种烟雾质量消光系数．试验结果和计算表明：以含氟聚合物的赤磷发烟剂燃烧产生烟雾在远红外波段的质量消光系数最高，透过率最低，并分析了上述烟雾在远红外波段具有不同质量消光系数的原因．