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May 25, 2018Open AccessArticle
Introduction: A
fragmentation pathway of atorvastatin de-protonated ion was proposed based on
rational interpretation workflows. Method: The
mass spectral data (MS, MS/MS and MS3) of atorvastatin was obtained
by electrospray negative ionization mode with flow injection analysis; using
liquid chromatography systems coupled with tandem mass spectr ...
May 25, 2018Open AccessArticle
In order to study the
steam reforming process of dimethyl ether, a kind of reformer reactor with
thermal jacket, heat pipe and catalytic reaction bed was designed. The effects
of reaction gas temperature, molar ratio of water to ether and the structure
parameters of the reactor on the conversion of dimethyl ether, the yield of hydrogen,
the hydrogen concentration at the outlet of the reactor a ...
May 24, 2018Open AccessArticle
Enrichment and
purification of ursolic acid from Cynomorium
songaricum exacts were studied using five macroporous resins. The static
tests indicated that D101 resin was appropriate and its adsorption data were
well fitted to the Langmuir and Freundlich isotherms. To optimize the
separation process, dynamic adsorption and desorption tests were carried out.
The op ...
May 24, 2018Open AccessArticle
Haar wavelets are applied for solution of three
dimensional partial differential equations (PDEs) or time depending two dimensional
PDEs. The proposed method is mathematically simple and fast. Two techniques are used in numerical solution, the first based on
2D-Haar wavelets and the second based on 3D-Haar wavelets and we compare them.
To demonstrate the efficiency of the method, two test prob ...
May 24, 2018Open AccessArticle
This preliminary paper discusses the creation of an
agent based model for a signalized traffic intersection derived from a
previously developed mathematical vehicle-following micro-simulation model. The
results of the agent based model are compared to the results from the
mathematical model for verification purposes. The agent based model is then
used to show the effects of inclement weather on vehicle throughput at a
traffic inte ...
May 24, 2018Open AccessArticle
This paper mainly adopts
the panel data of listed company in GEM from 2012 to 2016, with the threshold
panel model, Deeply
studying the influence of R & D investment intensity on enterprise
performance, and discovering that R&D
intensity has a double threshold effect on enterprise performance. When the
sustainable ability of research and development activities is lower than the
first threshold va ...
May 24, 2018Open AccessArticle
Core competence of senior
citizen education teachers can play an important role in defining professional
standards of senior citizen education teachers, becoming a professional
threshold, measuring the core of teachers’ professional development, assessing
the current performance management, and being the tool for teachers’ self-evaluation.
The index system of core competence of senior citizen education t ...
May 24, 2018Open AccessArticle
As of the beginning of 2017, the number of motor
vehicles in our country exceeded 300 million. Motor vehicle emissions are one
of the most important sources of atmospheric haze. Therefore, vehicle emissions
and energy consumption have always been important research directions for
emission reduction and energy saving. In this paper, IOC (intake oxygen
concentration) observer and feedforward controller of EGR ...
May 24, 2018Open AccessArticle
General education is the development appeal of
humanistic education. At the basic education stage, the general teaching fits
with the physical and mental development and cognitive rules of learners at a
young age. Therefore, the application and practice of general education in
developed countries is relatively universal. The teaching of general education
in our country started late, but the proposition that needs to be developed i ...
May 23, 2018Open AccessArticle
Solar power has gained great usage in electricity generation world-wide, and stand-alone is common in Rwanda. Site visits and energy audit estimates for a typical residential house in Rwamagana district, were used to cost effectively compare stand-alone and grid-tied PV systems able to supply 7.2 kWh/day, load. Algorithms design of lifetime costs and benefits were developed, to analyse total daily energy requirements using Frequen ...
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