混沌Turbo CDMA通信系统

基于混沌数字编译码器与TurboCDMA,提出了一种新型CDMA通信系统－－混沌Turbo CDMA。其优点在于用混沌数字编译码器替代TurboCDMA中的交织器,从而减少了交织环节引起的时延,消除了用户干扰（MUI）的影响。最后得出了该系统的信噪比。仿真结果表明,即使在中、低信噪比时,其多用户误码特性依然接近单用户特性。     

控制换热器振动的结构处理

对二台焕热器的局部结构加以改造,人而消除了整个系统振动。     

关注未来的住宅与电器(二)

大型液晶显示操作 简便的带烤箱微波炉 尽管由于家庭环境、年龄层次不同,对于微波炉的使用方式方法不尽相同,但在许多方面的要求上却是一致的,例如希望“能制作各种菜肴”、“做出的饭菜美味可口”、“所需时间短”、“操作简单”、“节能”等等。 夏普开发的“烤饼重奖”ＲＥ—Ｍ３００能满足用户们以上的种种要求,受到各年龄层次人们的广泛好评现将该产品的特点概括如下： 驱动式加热器 ＲＥ—Ｍ３００采用能以强火快速进行烧烤的驱动式加热器,因此制作的烤鱼等食品保持水分,香酥可口。 上下火势调节器 在进行烧烤时,上下火势调节…     

Competitive adsorption of copper(II), cadmium(II), lead(II) and zinc(II) onto basic oxygen furnace slag

Polluted and contaminated water can often contain more than one heavy metal species. It is possible that the behavior of a particular metal species in a solution system will be affected by the presence of other metals. In this study, we have investigated the adsorption of Cd(II), Cu(II), Pb(II), and Zn(II) onto basic oxygen furnace slag (BOF slag) in single- and multi-element solution systems as a function of pH and concentration, in a background solution of 0.01M NaNO(3). In adsorption edge experiments, the pH was varied from 2.0 to 13.0 with total metal concentration 0.84mM in the single element system and 0.21mM each of Cd(II), Cu(II), Pb(II), and Zn(II) in the multi-element system. The value of pH(50) (the pH at which 50% adsorption occurs) was found to follow the sequence Zn>Cu>Pb>Cd in single-element systems, but Pb>Cu>Zn>Cd in the multi-element system. Adsorption isotherms at pH 6.0 in the multi-element systems showed that there is competition among various metals for adsorption sites on BOF slag. The adsorption and potentiometric titrations data for various slag-metal systems were modeled using an extended constant-capacitance surface complexation model that assumed an ion-exchange process below pH 6.5 and the formation of inner-sphere surface complexes at higher pH. Inner-sphere complexation was more dominant for the Cu(II), Pb(II) and Zn(II) systems.     

Characteristics and mechanisms of phosphate adsorption onto basic oxygen furnace slag

The adsorption characteristics of phosphate adsorption on the basic oxygen furnace (BOF) slag were identified as a function of pH and ion strengths in solution. In addition, adsorption mechanisms were investigated by conducting batch tests on both the hydrolysis and phosphate adsorption process of the BOF slag, and making a comparative analysis to gain newer insights into understanding the adsorption process. Results show that the adsorption capacity from 4.97 to 3.71 mgP/g slag when the solution pH was increased from 2.0 to 13.0 and phosphate initial concentration was 50 mg/L, indicating that adsorption capacity is largely dependent upon the pH of the system. The results of the competitive adsorption between phosphate and typical anions found in wastewater, such as NO(3)(-), SO(4)(2-) and Cl(-), onto BOF slag reveal that BOF slag can selectively adsorb phosphate ions. The insignificant effect of NO(3)(-), SO(4)(2-) and Cl(-) on phosphate adsorption capacity indicates that phosphate adsorption is through a kind of inner-sphere complex reaction. During the adsorption process, the decrease of phosphate concentration in solution accompanied with an increase in pH values and concentrations of NO(3)(-), SO(4)(2-) and Cl(-) suggests that phosphate replaced the functional groups from the surface of BOF slag which infers that ligand exchange is the dominating mechanism for phosphate removal. At the same time, the simultaneous decreases in PO(4)(3-) and total calcium, magnesium and aluminum concentration in solution indicate that chemical reaction and precipitation are other mechanisms of phosphate removal.     

卡拉胶在肉制品中的应用

介绍了卡拉胶的功能特性,强调了卡拉胶应用于肉制品加工中的工艺要求.     

熏制圆火腿的加工工艺

本文简介了熏制圆火腿的加工工艺要点和产品质量要求.     

熔盐混合物的过量焓关联

基于熔盐混合物与含醇溶液的某些相似性,将含醇溶液的过量焓方程推广到熔盐混合物.该方程由物理和化学作用两部分贡献组成,具有良好的灵活性和通用性,对149种熔盐混合物的过量焓计算结果表明,与实验值的平均绝对误差为0.29%,最大误差不超过1.8%.     

砌体复合隔震结构设计方案的合理选择

通过对一砌体隔震建筑设计方案的讨论 ,研究了砌体复合隔震设计方案的合理选择问题。论述了影响砌体复合隔震方案的主要因素及选择合理隔震方案的原则。     

Surface-effect on detection ability of fluorescent Eu(btc) metal-organic frameworks to metal ions

Eu(btc)metal organic frameworks(MOFs)were prepared by co-precipitation method via 1,2,4-benzenetricarboxylic acids(H3btc)connecting with Eu³⁺ions,and the morphology was controlled from compact spherical to irregular honeycomb by adjusting the pH of reaction solutions.The luminescence properties of Eu(btc)MOFs are found to be related to the surface morphology of products,and the compact spherical one performs stronger emission intensity.The sensing ability of Eu(btc)MOFs to 11 kinds of metal ions was investigated and a prominent quenching effect occurrs in Fe³⁺,or Ni²⁺solutions.Based on UV—vis absorption analysis,an“ion-fence”model presents the competition to absorb exciting light between Eu(btc)MOFs and adsorbed metal ions.Based on Stern-Volmer equation,the Eu(btc)detection is found with higher Ksv value and a lower detection limit.Meanwhile,a higher sensing efficiency is confirmed in the Eu(btc)MOFs with loose honeycomb due to aggravating porous surface offering much more sites for metal ions.