Stability Constants of Cobalt(II) and Copper(II) Complexes with 3-[(o-Carboxy-p-nitrobenzene)azo]chromotropic Acid and Selective Determination of Copper(II) by Competition Coordination

A method for selective determination of copper(II) based on the reactions of copper(II) or cobalt(II) with 3-[(o-carboxy-p-nitrobenzene)azo]chromotropic acid (CNBAC) at pH = 11.4 was developed. Results have shown that two complexes, Co(CNBAC)2 and Cu(CNBAC), were formed, whose cumulative stability constants were 5.22 × 109 and 7.61 × 105 dm3 mol–1, respectively, and their molar absorption coefficients were 1.19 × 104 and 2.12 × 104 dm3 mol–1 cm–1 at 610 nm. The competition coordination of CuII and CoII with CNBAC was applied for selective determination of CuII by the spectral correction technique. In the absence of any masking reagent, the recommended method was selective and was applied for quantitative determination of copper(II) in river and waste water samples

Key Points in Implementation of Knowledge Management and its Solutions

In knowledge-base economy era, knowledge becomes the most important resource for enterprise instead of physical labor, capital and natural resources. The success of the enterprise depends more and more on the quantity and quality of knowledge owned by it. The core competitiveness originates from employees’ innovation ability which comes from knowledge accumulation and knowledge management. How to manage the knowledge possessed by the enterprise and how to make it becoming the sustaining competitive advantages for the enterprise? This is a new problem we must face. Finding the key points of knowledge management and plan the solution path are the crux to settle this problem. Key words: Knowledge; Knowledge Management; Innovation; Competitiveness Résumé: Dans l’ ère de l’économie de la connaissance, la connaissance devient la ressource la plus importante pour les entreprises au lieu de travail physique, des capitaux et des ressources naturelles. Le succès de l'entreprise dépend de plus en plus de la quantité et de la qualité de la connaissance détenue par elle même. Les compétitivités principales viennent de la capacité d'innovation des employés qui provient de l'accumulation des connaissances et la gestion des connaissances. Comment faire pour gérer les connaissances possédées par l'entreprise et comment faire pour qu’elles deviennent des avantages concurrentiels soutenus pour l'entreprise? Il s'agit d'un nouveau problème à qui nous devons faire face. Pour régler ce problème, il faut trouver les points clés de la gestion des connaissances et planifier les moyens de solution. Mots-Clés: connaissances; gestion des connaissances; innovation; compétitivité

Key Points in Implementation of Knowledge Management and Its Solutions

In knowledge-base economy times, knowledge becomes the most important resource for enterprise instead of physical labor, capital and natural resources. The success of the enterprise depends more and more on the quantity and quality of knowledge owned by it. The core competitiveness originates from employees’ innovation ability which comes from knowledge accumulation and knowledge management. How to manage the knowledge possessed by the enterprise and how to make it becoming the sustaining competitive advantages for the enterprise? This is a new problem we must face. Finding the key points of knowledge management and plan the solution path are the crux to settle this problem. Key Words: Knowledge; Knowledge Management; Innovation; Competitiveness Résumé: Dans l’ ère de l’économie de la connaissance, la connaissance devient la ressource la plus importante pour les entreprises au lieu de travail physique, des capitaux et des ressources naturelles. Le succès de l'entreprise dépend de plus en plus de la quantité et de la qualité de la connaissance détenue par elle même. Les compétitivités principales viennent de la capacité d'innovation des employés qui provient de l'accumulation des connaissances et la gestion des connaissances. Comment faire pour gérer les connaissances possédées par l'entreprise et comment faire pour qu’elles deviennent des avantages concurrentiels soutenus pour l'entreprise? Il s'agit d'un nouveau problème à qui nous devons faire face. Pour régler ce problème, il faut trouver les points clés de la gestion des connaissances et planifier les moyens de solution. Mots-clés: connaissances; gestion des connaissances; innovation; compétitivités 摘 要：在知識經濟時代，知識取代勞動、資本和自然資源成為企業最重要的資源。企業的成功越來越依賴於企業所擁有知識的數量和質量，企業的核心競爭力來源於全體員工的創新能力，而員工的創新能力則來自知識積累和知識管理。如何對企業所擁有的知識進行管理，使這些知識為企業創造持續的競爭優勢是任何企業都要面對的全新課題，找到知識管理的難點並提前規劃解決路徑，是推行知識管理成敗的關鍵。 關鍵詞：知識；知識管理；創新；競爭

Differential measurement of atmospheric refraction with a telescope with double fields of view

For the sake of complete theoretical research of atmospheric refraction, the atmospheric refraction under the condition of lower angles of elevation is still worthy to be analyzed and explored. In some engineering applications, the objects with larger zenith distance must be observed sometimes. Carrying out observational research of the atmospheric refraction at lower angles of elevation has an important significance. It has been considered difficult to measure the atmospheric refraction at lower angles of elevation. A new idea for determining atmospheric refraction by utilizing differential measurement with double fields of view is proposed. Taking the observational principle of HIPPARCOS satellite as a reference, a schematic prototype with double fields of view was developed. In August of 2013, experimental observations were carried out and the atmospheric refractions at lower angles of elevation can be obtained by the schematic prototype. The measured value of the atmospheric refraction at the zenith distance of 78.8 degree is $240.23"\pm0.27"$, and the feasibility of differential measurement of atmospheric refraction with double fields of view was justified. The limitations of the schematic prototype such as inadequate ability of gathering light, lack of accurate meteorological data recording and lower automatic level of observation and data processing were also pointed out, which need to be improved in subsequent work.Comment: 10 pages, 6 figure

Degree correlation effect of bipartite network on personalized recommendation

In this paper, by introducing a new user similarity index base on the diffusion process, we propose a modified collaborative filtering (MCF) algorithm, which has remarkably higher accuracy than the standard collaborative filtering. In the proposed algorithm, the degree correlation between users and objects is taken into account and embedded into the similarity index by a tunable parameter. The numerical simulation on a benchmark data set shows that the algorithmic accuracy of the MCF, measured by the average ranking score, is further improved by 18.19% in the optimal case. In addition, two significant criteria of algorithmic performance, diversity and popularity, are also taken into account. Numerical results show that the presented algorithm can provide more diverse and less popular recommendations, for example, when the recommendation list contains 10 objects, the diversity, measured by the hamming distance, is improved by 21.90%.Comment: 9 pages, 3 figure