The Separate Meter in Separate Meter Out Control System Using Dual Servo Valves Based on Indirect Adaptive Robust Dynamic Surface Control

Due to the demand for energy efficiency in electro-hydraulic systems, the separate meter in and separate meter out(SMISMO) control system attracts vast attention. In this paper, the SMISMO control system was configured with two servo valves to control the meter in and meter out separately.By designing two of the proposed indirect adaptive robust dynamic surface controllers(IARDSC)for the working-side and off-side system and setting the coupled items as estimated parameters, the SMISMO control system was decoupled into two subsystems completely. Here, indirect adaptive robust control(IARC) was employed to address the internal parameter uncertainties and external disturbances.Dynamic surface control(DSC) was utilized in the backstepping design procedure of IARC to deal with the inherent ‘explosion of terms' problem. As thus, the proposed IARDSC could simplify the design procedure, decrease the computational cost, and achieve an improved control performance in practical use. Finally, experimental results validated the effectiveness of proposed IARDSC and showed that the proposed SMISMO control system could provide a possibility to save more energy.     

藏文古籍书籍类数字图书馆元数据标准的设计研究

书籍类元数据标准是建立藏文古籍书籍类数字图书馆的基础性工作。根据藏文古籍书籍的特点和要求，参考国际通用元数据制定规则，提出藏文古籍数字图书馆书籍类元数据标准。     

食品活性包装

包装类型是影响包装食品货架期的重要因素之一．活性包装可以降低外部因素对包装内部食品的影响．笔者综述了食品的活性包装及其应用，以及食品活性包装的发展方向．     

硒酵母制备中添加不同硒化物对酵母中硒含量的影响

进行了在麦芽汁培养液中添加亚硒酸钙、亚硒酸钠、二氧化硒等多种硒化合物制备硒酵母的研究．结果表明,酵母同化各种无机硒化物为有机硒的利用度不同,其中亚硒酸钙作为硒源具有毒性小、利用度高的特点．     

β—Keggin结构钨钼硅混配型杂多酸（盐）的合成及性质研究

报道了５种新化合物ＬｎＨＳｉＭｏ３Ｗ９Ｏ（４０）·ｘＨ２Ｏ（Ｌｎ＝Ｌａ，Ｎｄ，Ｓｍ，Ｅｕ，Ｇｄ）的合成．Ｘ－射线粉末衍射和红外光谱分析结果表明，５种化合物具有β－Ｋｅｇｇｉｎ结构．并通过紫外光谱、循环伏安和差热分析等测定了它们的性质，还讨论了反荷阳离子Ｌｎ（３＋）对主要红外振动光谱及热分解温度的影响。     

三种常见杯芳烃吸附苯酚能力的分子模拟研究及初步实验验证

用分子动力学模拟方法研究了对叔丁基杯[6]芳烃、对叔丁基杯[8]芳烃、四丙基间苯二酚杯[4]芳烃三种常见杯芳烃吸附环境水污染物苯酚的能力。数据分析表明分子模拟结果可成功地比较三种常见杯芳烃对苯酚吸附作用的强弱顺序,即四丙基间苯二酚杯[4]芳烃>对叔丁基杯[6]芳烃>对叔丁基杯[8]芳烃。模拟结果通过实验进行了初步验证。     

具有Dawson结构的过渡金属杂多钨磷酸盐的氧化还原性质研究

采用极谱和循环伏安法,研究过渡金属杂多钨磷酸盐K_x[P_2W_(17)ZO_(62)]·nH_2O(Z=Ti~(4+),Mn~(2+),Fe~(3+),Co~(2+),Ni~(2+),Cu~(2+),简写为P_2W_(17)Z)在溶液中的氧化还原性质,发现杂多阴离子的第一极谱半波还原电位E_(1/2)的顺序为Cu~(2+)>Ni~(2+)>Co~(2+)>Fe~(2+)>Mn~(2+)。分析了循环伏安峰电位与pH的关系,提出了它们的还原机理,讨论了过渡元素对杂多阴离子氧化还原性质的影响。     

Characteristics of 137Cs deposition in steppe area

Soil wind erosion in the semiarid steppe area was studied using the 137Cs tracing technique. Comparisons of 137Cs deposition characteristics between different soil profiles indicated that slight aeolian activities occurred on sandy grasslands and semi-fixed dunes with erosion/deposition rates of less than 0.108 cm/a, whereas they were intense on semi-shifting dunes with erosion/deposition rates of higher than 1.35 cm/a.