2,102 research outputs found
Synthesis, structural characterization, and application of N-doped TiO2 photocatalyst under visible-light irradiation
N-doped TiO2Â nanomaterials were prepared with the sol-gel method. The structure and properties of the materials were characterized by using XRD, UV-Vis, SEM, EDX, and IR techniques. The optimal dose of ammonium chloride for doping is 600 mg. The optical absorption edge of N-TiO2 displays a redshift, and a long tail occurs in the presence of nitrogen in the material. Thereby, N-TiO2 may exhibit improved absorption properties under visible light and the solar irradiation. The photocatalytic activity was investigated on the degradation of rhodamine B. The optimal amount of the photocatalyst is 1.8 g/L under visible light
Evaluation of plant growth regulators on root formation of semihardwood and hardwood cuttings of Sarcandra glabra (Thunb.) Nakai
The aim of this study is to evaluate the effects of three types of plant growth regulators (α- naphthyl acetic acid, indole-3-acetic acid and β-indol butyric acid) on the root formation of the semihardwood and hardwood cuttings of Sarcandra glabra (Thunb.) Nakai. The effects of plant growth regulators on root formation were evaluated based on living percentage, rooting percentage, secondary rooting percentage, and the number and the length of roots. The results showed that the best root growth regulator was β-IBA. The overall effective concentrations of growth regulators were 1.0 and 1.5%. The living percentage of the semihardwood cuttings was lower than that of the hardwood cuttings. However, the root growth parameters of the semihardwood cuttings were better than those of the hardwood cuttings.
Blaschke, Separation Theorems and some Topological Properties for Orthogonally Convex Sets
In this paper, we deal with analytic and geometric properties of orthogonally
convex sets. We establish a Blaschke-type theorem for path-connected and
orthogonally convex sets in the plane using orthogonally convex paths. The
separation of these sets is established using suitable grids. Consequently, a
closed and orthogonally convex set is represented by the intersection of
staircase-halfplanes in the plane. Some topological properties of orthogonally
convex sets in dimensional spaces are also given.Comment: 17 pages, 10 figures, adding more reference
On simultaneous diagonalization via congruence of real symmetric matrices
Simultaneous diagonalization via congruence (SDC) for more than two symmetric
matrices has been a long standing problem. So far, the best attempt either
relies on the existence of a semidefinite matrix pencil or casts on the complex
field. The problem now is resolved without any assumption. We first propose
necessary and sufficient conditions for SDC in case that at least one of the
matrices is nonsingular. Otherwise, we show that the singular matrices can be
decomposed into diagonal blocks such that the SDC of given matrices becomes
equivalently the SDC of the sub-matrices. Most importantly, the sub-matrices
now contain at least one nonsingular matrix. Applications to simplify some
difficult optimization problems with the presence of SDC are mentioned
What Makes for an Effective Commune Health Center?
This report, based on the main findings from a large-scale longitudinal study of rural health care in Viet Nam from 2008 to 2016, aims to develop the basic components of effective commune health center (CHC) models for different rural areas in Viet Nam.CHCs form the grassroots public health care system in rural Viet Nam, where two-thirds of the country's people live. The centers provide basic preventive care along with initial diagnoses, treatments and referrals to public hospitals.The report includes:A toolkit for assessing CHCs in different contexts identifying best practicesAn analysis of three models for the effective CHCPolicy recommendations aimed at developing major components of CHC model
Vers un modèle de vérification de la couche logique d'entreprise dans une architecture à 3 couches: modèle CPN-ECA
International audienceThis paper proposes a model for building a flexible system, which accepts and verifies the change on business logic, including both business processes and business rules, while the system has to cover the properties as reliability and reuse. In this model, the business process will be designed with Colour Petri Net and translated into a set of Event-Condition-Action rules, this set will be combined with business rules for checking the respect of a business process to the business rules in design and modifying the process. Hierarchical Colour Petri Net is also used to guarantee the reliability and to reuse properties of the system.Ce document propose un modèle pour la création d'un système flexible, qui accepte et vérifie les modifications apportées à la logique métier, y compris les processus et les règles métier, tandis que le système doit couvrir les propriétés en termes de fiabilité et de réutilisation. Dans ce modèle, le processus de gestion sera conçu avec un réseau Pétri coloré et traduit en un ensemble de règles Event-Condition-Action (ECA). Cet ensemble sera combiné à des règles de gestion permettant de vérifier le respect du processus de gestion par modifier le processus. Un réseau Pétri coloré hiérarchisé est également utilisé pour garantir la fiabilité et pour réutiliser les propriétés du systèm
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