进口水溶性助焊剂的分析

用化学法对进口水溶性助焊剂进行分离，并用ＩＲ、ＧＣ／ＭＳ、ＮＭＲ对其进行了鉴定。     

A New Molecularly Imprinted Polymer (MIP)‐based Electrochemical Sensor for Monitoring Cardiac Troponin I (cTnI) in the Serum

A novel molecularly imprinted polymer (MIP) sensor for rapid determination of cardiac troponin (cTnI) was established. Since it can bind to the template molecule cTnI specifically, it can be used to detect concentration of cTnI in serum without much sample pretreatment. What's more, the electrochemical signals depend on the concentration of template molecules. The synthetic sensor possesses advantages including simplicity, high specificity, low cost of preparation, good chemical and mechanical properties, sensitive and label‐free determination. The synthetic sensor shows good dynamic linearity at concentration range from 0.05 to 5.00 nM. The limit of detection (LOD) was found to be 0.027 nM. The detection time of whole process was within 5 minutes.     

PEG‐4000‐promoted palladium‐catalyzed N‐allylation in water: aminonaphthalene as an example

An environmentally friendly, efficient catalytic process using palladium associated with ligands in a PEG4000–water system leading to N‐allylation was described in this study. PEG‐4000 was found to improve the palladium‐catalyzed allylic amination of allylic acetates with aminonaphthalenes and gave overall good to high yields of the corresponding N‐allylic aminonaphthalenes. Copyright © 2012 John Wiley & Sons, Ltd.     

Identity of coleonol with forskolin: structure revision of a base-catalysed rearrangement product

The identity of coleonol and forskolin is shown through structure revision of a rearrangement product isolated earlier from coleonol and is confirmed by direct comparison of authentic coleonol with forskolin $\text{1}$; in addition, coleonol-B should be correctly represented by structure $\text{4}$.     

In-situ scanning tunneling microscopy of carbon monoxide adsorbed on Au(111) electrode

In-situ scanning tunneling microscopy (STM) coupled with cyclic voltammetry was used to examine the adsorption of carbon monoxide (CO) molecules on an ordered Au(111) electrode in 0.1 M HClO4. Molecular resolution STM revealed the formation of several commensurate CO adlattices, but the (9 x radical 3) structure eventually prevailed with time. The CO adlayer was completely electrooxidized to CO2 at 0.9 V versus RHE in CO-free 0.1 M HClO(4), as indicated by a broad and irreversible anodic peak which appeared at this potential in a positive potential sweep from 0.05 to 1.6 V. A maximal coverage of 0.3 was estimated for CO admolecules from the amount of charge involved in this feature. Real-time in-situ STM imaging allowed direct visualization of the adsorption process of CO on Au(111) at 0.1 V, showing the lifting of (radical 3 x 22) reconstruction of Au(111) and the formation of ordered CO adlattices. The (9 x radical 3) structure observed in CO-saturated perchloric acid has a coverage of 0.28, which is approximately equal to that determined from coulometry. Switching the potential from 0.1 to -0.1 V restored the reconstructed Au(111) with no change in the (9 x radical 3)-CO adlattice. However, the reconstructed Au(111) featured a pairwise corrugation pattern with two nearest pairs separated by 74 +/- 1 A, corresponding to a 14% increase from the ideal value of 65.6 A known for the ( radical 3 x 22) reconstruction. Molecular resolution STM further revealed that protrusions resulting from CO admolecules in the (9 x radical 3) structure exhibited distinctly different corrugation heights, suggesting that the CO molecules resided at different sites on Au(111). This ordered structure predominated in the potential range between 0.1 and 0.7 V; however, it was converted into new structures of (7 x radical 7) and ( radical 43 x 2 radical 13) on the unreconstructed Au(111) when the potential was held at 0.8 V for ca. 60 min. The coverage of CO adlayer decreased accordingly from 0.28 to 0.13 before it was completely removed from the Au(111) surface at more positive potentials.     

An informal synthesis of ± lysergine

The synthesis of lysergine from tryptophane is described.     

A game-theoretic analysis of information sharing and security investment for complementary firms

This paper investigates information sharing and security investments by two firms provided that their information assets are complementary in the sense that their combined information assets are of significant value, whereas the information asset of a single firm is no value to an attacker. In particular, assuming that each firm chooses its security investment and information sharing individually, we obtain some insights about the optimal choices for the firms and the attacker, which form sharp comparisons with those derived from common (substitutive) firms. We further analyse the effect of a social planner on social total costs by assuming that it can control security investments, information sharing and both of them respectively. We demonstrate that an increase in intervention by the social planner may not necessarily be preferable.     

Role of the anion in the underpotential deposition of cadmium on a Rh(111) electrode: probed by voltammetry and in situ scanning tunneling microscopy

In situ scanning tunneling microscopy (STM) and cyclic voltammetry (CV) were employed to examine the underpotential deposition (UPD) of cadmium on a rhodium(111) electrode in sulfuric and hydrochloric acids. The (bi)sulfate and chloride anions in the electrolytes played a main role in controlling the number and arrangement of Cd adatoms. Deposition of Cd along with hydrogen adsorption occurred near 0.1 V (vs reversible hydrogen electrode) in either 0.05 M H2SO4 or 0.1 M HCl containing 1 mM Cd(ClO4)2. These coupled processes resulted in an erroneous coverage of Cd adatoms. The process of Cd deposition shifted positively to 0.3 V and thus separated from that of hydrogen in 0.05 M H2SO4 containing 0.5 M Cd2+. The amount of charge (80 microC/cm2) for Cd deposition in 0.5 M Cd2+ implied a coverage of 0.17 for the Cd adatoms, which agreed with in situ STM results. Regardless of [Cd2+], in situ STM imaging revealed a highly ordered Rh(111)-(6 x 6)-6Cd + HSO4- or SO42- structure in sulfuric acid,. In hydrochloric acid, in situ STM discerned a (2 x 2)-Cd + Cl structure at potentials where Cd deposition commenced. STM atomic resolution showed roughly one-quarter of a monolayer of Cd adatoms were deposited, ca. 50% more than in sulfuric acid. Dynamic in situ STM imaging showed potential dependent, reversible transformations between the (6 x 6) Cd adlattices and (square root 3 x square root 7)-(bi)sulfate structure, and between (2 x 2) and (square root 7 x square root 7)R19.1 degrees -Cl structures. The fact that different Cd structures observed in H2SO4 and HCl entailed the involvement of anions in Cd deposition, i.e. (bi)sulfate and chloride anions were codeposited with Cd adatoms on Rh(111).     

四元数矩阵方程AXB=C和AX-XB=C解的性质

本文利用四元数矩阵方程AX-XB=C有唯一解的充要条件给出了两个定理，并讨论了特殊条件下四元矩阵方程AX-XB=C在C=0和C=0且A=B两种情况下解的性质．