以1,3-二(4-邻羟基苯亚胺次甲基)苯氧基丙烷为载体的铁离子(Ⅲ)电极的研究

以1,3-二(4-邻羟基苯亚胺次甲基)苯氧基丙烷为中性载体制备了PVC膜Fe3+离子选择性电极。该电极对Fe3+呈现出良好的选择性和近Nernst电位响应性能。电极斜率为21mV/dec,线性范围为3.0×10-5～1.0×10-1mol/L,检出限为1.0×10-5mol/L。采用交流阻抗技术研究了电极的响应机理,并将电极作为指示电极初步用于EDTA的电位滴定。     

以丙二酰肼席夫碱为中性载体的钴离子选择性电极的研究

以双水杨醛缩丙二酰肼为中性载体制备了PVC膜Co2+离子选择性电极.该电极对Co2+呈现出良好的选择性和近Nemst电位响应性能.电极斜率为31.1 mV/dec,线性范围为1.0×10-1～3.2×10-5mol/L,检测下限1.0×10-5 mol/L.采用交流阻抗技术研究了电极响应机理,并将电极作为指示电极初步应用于EDTA的电位滴定及Co2+的回收率实验,结果令人满意.     

基于乙酰丙酮席夫碱为中性载体的高选择性铝离子电极的研究

该文报道了基于双(2-氨基苯酚)乙酰丙酮为中性载体的一种PVC膜离子选择性电极的研制.该电极对Al3+具有较好的电位响应性能和选择性,电极在pH=3.0的硝酸盐缓冲体系中对Al3+呈近能斯特响应,线性响应范围为5.5×10-6～1.0×10-mol/L,斜率为(19.7±0.3)mV/decade,检测下限为2.6×10-6 mol/L.采用紫外分光光度法和膜交流阻抗技术研究了该席夫碱与Al3+的响应机理.将其初步应用于电位滴定和废水中A13+回收率的测定,获得较满意的结果.     

稀土三元配合物中性载体水杨酸根离子电极的研究

以8-羟基喹啉-邻菲罗啉-La(Ⅲ)稀土配合物[La(Ⅲ)(Phen)(Oxine)]为中性载体的PVC膜电极对水杨酸根具有良好的电位响应性能和选择性,其选择性次序为Sal-＞ClO4-＞SCN-＞I-＞Br-＞NO2-＞SO32-＞Cl-＞SO42-.在pH4.0的磷酸盐缓冲体系中,电极电位呈现近能斯特响应,线性响应范围为1.0×10-5～1.0×10-1 mol/L,斜率为-58.5 mV/dec(20℃),检测下限为9.8×10-6 mol/L.采用交流阻抗技术研究了电极的响应机理,结果表明,配合物中心金属原子的结构以及载体本身的结构与电极的响应行为之间有非常密切的构效关系.电极可用于药品分析.     

以碳纳米管-氨基硫脲复合物为载体的碳糊铁离子选择性电极研究

以碳纳米管-氨基硫脲复合物为载体制成碳糊电极,该电极对铁离子具有选择性的Nernst电位响应,其线性范围为3.5×10^-7-1.0×10^-1mol/L,斜率为30.7 mV/decade,检测下限为1.0×10^-7 mol/L。该电极对Fe^3＋的响应时间为15 s,其选择性良好,并能成功应用于Fe^3＋的回收率实验。     

基于双核酞菁铜为中性载体的水杨酸根选择性电极的研究

合成了一种双核酞菁铜的衍生物,并将其用于离子选择性电极的敏感材料,制备出了基于该载体的水杨酸根离子(Sal-)选择性电极.该电极对Sal-呈现出良好的选择性和近能斯特电位响应性能.电极斜率为-56.5 mV/dec,线性范围为1.0×10-1～2.2×10-6mol/L,检测下限8.9×10-7mol/L.该电极用于了阿司匹林药片中水杨酸含量的分析,结果令人满意.     

海胆球形锰酸锂修饰碳糊型锂离子选择电极的研究

建立了一种新的锂离子选择电极体系,以水热法的Mn O2为原料制备海胆球形的尖晶石锰酸锂,以其为活性载体,采用压片技术制备了锰酸锂-碳糊电极(LMO-CPE),该电极对Li+具有优良的电位响应特性。并探讨了响应机理,系统研究了电极组分配比、适用的p H值范围、检测下限、选择性系数等性能。实验结果表明:锰酸锂:乙炔黑:石蜡(质量分数比)=20∶50∶30时制备的LMO-CPE电极在1×10-5~1×10-1mol/L范围内出现能斯特响应,p H=10时的响应性能最好,响应时间15 s以下,斜率可达到67.17 m V/dec,检测下限7.76×10-6mol/L;采用混合溶液法测得Na+和K+选择性系数分别为1.02×10-3和1.97×10-3,Ca2+、Mg2+、Ba2+的选择性系数在10-5数量级以下,该类电极对于其他碱金属和碱土金属离子有好的选择性。     

一种新型的铬（Ⅲ）离子选择性电极的研制与应用

以水杨醛和硫代氨基脲合成的席夫碱水杨醛缩-硫代氨基脲为中性载体,将其与碳粉混合,以液体石蜡为粘合剂,制备了新型的铬（Ⅲ）离子选择性电极。在室温下,电极对Cr3＋的能斯特响应浓度范围为4.00×10-7～1.00×10-2mol/L,斜率为20.31mV/dec,检测下限为1.58×10-7mol/L。电极的响应时间小于20s,pH使用范围广（3.20～5.80）,稳定性好,使用寿命长。在选定的条件下,用固定干扰离子法（FIM）考察了10余种离子的干扰情况,结果显示,电极对Cr3＋具有较好的选择性。以该离子选择性电极为指示电极,饱和甘汞电极为参比电极,用直接电位法对废水中的Cr3＋进行测定,结果令人满意。     

基于2,4-二羟基苯甲酸铜(Ⅱ)为载体的硫氰酸根电极的电位响应

制备了基于一种简单的金属铜配合物2,4-二羟基苯甲酸铜(Ⅱ)(Cu(Ⅱ)DHBA)为载体的PVC膜硫氰酸根离子(SCN-)选择性电极。该电极在1.0×10-1～1.0×10-6mol/LSCN-浓度范围内呈现斜率为-59.5mV/dec的近Nernst电位响应,检测下限为9.1×10-7mol/L。利用紫外可见光谱及交流阻抗技术初步探讨了电极对SCN-呈现的选择性电位响应机理。该电极作为直接电位分析法的指示电极,成功运用于实验室废水中硫氰酸盐含量的测定。     

过氧化聚吡咯分子印迹膜修饰电极对3，4-二羟基苯甲酸的测定

利用分子印迹技术,以3,4-二羟基苯甲酸(3,4-DHBA)作模板分子,通过循环伏安法电聚合吡咯.膜(PPy)和随后的定电位过氧化制备了3,4-DHBA-OPPy/GC分子印迹电极.该电极能有效地抑制电化学氧化过程中3,4-DHBA的聚合和同分异构体2,4-二羟基苯甲酸对其测定的干扰.实验结果表明,该修饰电极对3,4-DHBA测定的线性范围为1.0×10-5～1.6×10-3mol/L,检测限为5.0×10-6mol/L.     

Not a castaway but a stowaway

A portable keyboard that's no larger than my phone, that's theiGo Stowaway.     

Combining a monad and a comonad

We give a systematic treatment of distributivity for a monad and a comonad as arises in giving category theoretic accounts of operational and denotational semantics, and in giving an intensional denotational semantics. We do this axiomatically, in terms of a monad and a comonad in a 2-category, giving accounts of the Eilenberg–Moore and Kleisli constructions. We analyse the eight possible relationships, deducing that two pairs are isomorphic, but that the other pairs are all distinct. We develop those 2-categorical definitions necessary to support this analysis.     

On a nonlinear problem of a sequential control with a parameter

The problem of evasion of a group of moving points from a nonlinear controlled object, whose goal is consecutively approach these points in a prescribed order, is analyzed. The movement of each point is defined uniquely by a scalar parameter chosen at the initial time instant. The controlled object minimizes a certain cost function, and the group of the points, acting cooperatively, maximize this cost function by choosing the parameters. Necessary optimality conditions for parameters are obtained. A model problem of an evasion of moving points from a vehicle is solved.     

Three-Link Mechanism as a Model of a Person on a Swing

Journal of Computer and Systems Sciences International - We model movements of a person swinging on a swing. We consider a flat three-link hinged mechanism as the main mechanical model of the...     

Splitting a configuration in a simplex

This paper presents a new method of partition, named-splitting, of a point set ind-dimensional space. Given a pointG in ad-dimensional simplexT, T(G;i) is the subsimplex spanned by G and the ith facet ofT. LetS be a set ofn points inT, and let be a sequence of nonnegative integers ₁, ..., n_d+1 satisfying _i=1 ^d+1 ₁=n The-splitter of (T, S) is a pointG inT such thatT(G;i) contains at least _i points ofS in its closure for everyi=1, 2, ...,d + 1. The associated dissection is the re-splitting.The existence of a-splitting is shown for any (T, S) and, and two efficient algorithms for finding such a splitting are given. One runs inO(d²n logn + d³n) time, and the other runs inO(n) time if the dimensiond can be considered as a constant. Applications of re-splitting to mesh generation, polygonal-tour generation, and a combinatorial assignment problem are given.     

Motion control of a rotor with a cavity with a viscous fluid

A formulation and solution procedure of optimal control problems for perturbed relative uniform motion of a body with a cavity filled with a viscous incompressible fluid are proposed. In this paper, the case with a cylinder is considered; however, this approach is basically true for the a cavity of an arbitrary form. The formula for the angular velocity of perturbed motion depending on an external perturbing element is devised. After that, we have a possibility to set different optimal control problems and apply the formalism elaborated in the optimal control theory. Two illustrated problems are given.     

Building a sonar map in a specular environment using a singlemobile sensor

The physical properties of acoustic sensors are exploited to obtain information about the environment for sonar map building. A theoretical formulation for interpreting the sensor databases on the physical principles of acoustic propagation and reflection is presented. A characterization of the sonar scan that allows the differentiation of planes, corners, and edges in a specular environment is described. A single sensor mounted on an autonomous vehicle in a laboratory verifies the technique. The implications for sonar map building and the limitations of differentiating elements with one sensor are discussed