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Comparative Study of 3D Simulation and Experiment on Stator MPPUA of Generator under FWISC Faults with Different Degrees
Get PDFIn order to study the impacts of the stator magnetic pull per unit area (MPPUA) characteristics under different field winding inter-turn short-circuit (FWISC) degrees in generator, comparative study of 3D numerical simulations and experiments are respectively taken to calculate the quantitative data of stator MPPUA by finite-element method (FEM) in this paper. Firstly, the nature exciting force of stator vibration, which is called MPPUA, is carried out. Then simulations data on MPPUA under normal condition and different short-circuit degrees are obtained. Finally, the variation rules of MPPUA characteristics by experiments under different conditions are studied. The results show that in normal condition the main harmonic components of MPPUA consist of only 6th-harmonic component. However, the occurrence of FWISC will bring in extra 1st, 2nd, 3rd, 4th and 5th-harmonic components to MPPUA. Meanwhile, with the increasing of the rotor short circuit degrees, the amplitudes of 1st, 2nd, 3rd, 4th and 5th-harmonic components will present an increasing trend. However, the amplitudes of 6th-harmonic component will present a decrease trend
Transforming social work: Transcending vocational purpose—new book challenges current perspectives on social work
Get PDF“The evil that is in the world almost always comes of ignorance, and good intentions may do as much harm as malevolence if they lack understanding.
Weibel instability in Weakly Relativistic Laser Fusion Plasma
Get PDFIn this work, the Weibel instability due to inverse bremsstrahlung (IB) absorption in laser fusion plasma has been investigated. The stabilization effect due to the coupling of the self-generated magnetic field by Weibel instability with the laser wave field is explicitly showed. In this study, the relativistic effects are taken into account; here the basic equation is the relativistic Fokker-Planck equation. The main obtained result is that the coupling of self-generated magnetic field with the laser wave causes a stabilizing effect of excited Weibel modes. We found a decrease in the spectral range of Weibel unstable modes. This decreasing is accompanied by a reduction of two orders in the growth rate spectrum of instability, or even stabilization of these modes. It has been shown that the previous analysis of the Weibel instability due to IB have overestimated the values of the generated magnetic fields
Weibel instability in Weakly Relativistic Laser Fusion Plasma
Get PDFIn this work, we used the MATLAB code to calculate the growth rate of the Weibel instability (WI) in weakly relativistic parameters of laser-plasma interaction in the inertial thermonuclear fusion. In this study, the basic equation is the relativistic Fokker-Planck equation (FPE). However in our paper, the distribution function is not supposed but it is calculated from FPE by considering the fusion plasma heating by the laser source and the collisions term which corresponds to the laser fusion experiments. The main obtained result is a decrease in the spectral range of Weibel unstable modes. This decreasing is accompanied by a reduction of two orders in the growth rate spectrum of instability, this spectrum presents a maximum, which can be in terpreted by the competition between the loss effects (collisions and Landau damping) and the inverse bremsstrahlung absorption (IBA) with parameters of laser-plasma interactions
Competencies: A new currency for continuing professional development
Get PDF“No research without trained researchers” has become the mantra of the EU-funded Innovative Medicines Initiative (IMI) education and training projects. However, it is often hard to determine the type of training required at different stages of a scientist’s career. The situation is further complicated by the constantly changing environment, e.g. the growth of disruptive technologies, societal expectations of biomedical sciences, the greater need for multi-disciplinary collaborations, and conservative or changing regulatory requirements. This article summarises the experience from a series of five EMTRAIN Public Private Partnership PhD workshops that included both scientific and transferrable skill training. This is followed by an example of a recently developed training programme, including a competency profile, for translational research and medicines development; the C-COMEND teaching programme. The emphasis is on competencies as a new currency for continuing professional development. Finally, this paper describes what we consider to be the next steps required by the scientific community to address solutions to the current training challenges so that society can benefit from the innovations that only science can provide
Cytotoxic Effect of Chitosan Nanoparticles on Normal Human Dental Pulp Cells
Get PDF Introduction: Recent in vitro studies have shown that chitosan nanoparticles could enhance the antimicrobial activity of several dental materials. However, the biocompatibility of these nanoparticles with normal human cells is still controversial. The aim of this study was to evaluate the potential toxicity of various sizes and concentrations of chitosan nanoparticles cultured with normal human dental pulp cells. Methods: Normal human dental pulp cells were derived from human dental pulp tissues and cultured with (50-67) nm and (318-350) nm chitosan nanoparticles in concentrations: 0.2 mg/mL, 0.5 mg/mL, 1 mg/mL, and 2 mg/mL as study groups, and 0 mg/mL as a control. The cell attachment efficiency for each group was assessed at 16 hours. The proliferation rate and cell viability were evaluated at days 7 and 14. Both, attachment efficiency and proliferation rate were assessed by measuring the optical density of crystal violet stained cells. The cell viability was determined by the activity of the mitochondrial dehydrogenase enzyme. Statistical analysis was performed using One-Way ANOVA and post hoc Tukey test. Results: All concentrations of the (50-67) nm group significantly reduced cell attachment efficiency in comparison with the control (p<0.01) and with the (318-350) nm group (p<0.01). All concentrations of both groups, (50-67) nm and (318-350) nm, significantly reduced cell proliferation and cell viability compared to the control in dose-dependent and size-associated manners. (p<0.01). Conclusion: Chitosan nanoparticles exhibit a cytotoxic effect on normal human dental pulp cell
Intonational pitch features of interrogatives and declaratives in Chengdu dialect
Get PDFAs a representative of southwestern Mandarin, the Chengdu dialect has its own distinctive pitch features in phonology of tone and intonation. Research on the pronunciation and lexical tone of the Chengdu dialect has a long history with a certain amount of theoretical results. However, research on intonation of Chengdu dialect is still rare. The writer provides an acoustic analysis of research into intonational pitch features of interrogative and declarative sentences of Chengdu dialect, discussing the F0 contour at the final syllable (character) of each sentence to find out if the statement or question mood is carried by the edge tone as well as the pitch perturbation between lexical tone and intonation on it. The results of this acoustic analysis show that there exist statement and question mood of Chengdu dialect carried by the final syllable within an intonational phrase as well as the perturbation on the final syllable (character) by the coexistence of its lexical tone and intonation
Using ethnography in politeness studies: A discursiveness-based approach
Get PDFThe current study points out the methodological limitations of contemporary discursive politeness research and suggests that in-depth ethnographic data provides a potentially crucial solution. Discursive politeness studies advocate a data-driven, bottom-up analytical approach that stresses the importance of participants’ own contextual assessments. Analysis of such kind requires the corresponding methodological design which allows researchers to obtain the defining information that can be seemingly absent in the on-going interaction. However, in the current body of literature, politeness research focuses on theoretical discussion without specifically organised consideration regarding methodology. Therefore, aiming at providing a more valid methodological approach, the current study proposes to consider ethnography as the foundational data-collection method for discursive politeness research, stressing ‘long-term’ and ‘in-depth’ as the core features in conducting fieldwork. In order to clarify this view, the current study demonstrates a case study via examining an interaction naturally occurring among several family members during dinner time in China. This interaction is examined on two levels respectively (i.e., based on demographic data and in-depth ethnographic data). This paralleled analysis reveals that in complicated real-life interactions, lacking of thorough contextual information of both cultural norms and individually shaped cognition can be misleading in analysis. Therefore, understanding (im)politeness as an interactionally situated contextual/cognitive judgement, long-term ethnography is needed and that the fieldwork should be conducted carefully and patiently in order to gain access to comparatively more solid data and achieve more valid conclusion
A Foreword from the Editor
Get PDFWelcome to the 3rd issue of the Journal of Medicines Development Sciences. Like previous issues it contains articles covering the entire process of drug development from target identification to drug registration
Space-based Earth remote sensing: Part 1. Satellite orbit theory
Get PDFThe development of oceanography and meteorology has greatly benefited from remotely sensed satellite data of the atmosphere and ocean. For oceanographers, meteorologists, hydrologists and climatologists to obtain high-quality satellite data, orbits along which the satellites move must be designed carefully. For this reason, Sun-synchronous, repeat ground track orbits have traditionally been used for visible-wavelength and infrared Earth observations. As the needs for varied datasets are growing, however, new classes of Earth-observing missions are emerging such as interferometry and radiometry to name a few. On the other side, satellite platforms and onboard sensors are getting more compact and less expensive, allowing developing nations to launch their own satellites and under-researched parts of the Earth be studied. In light of these changes, this paper introduces new types of satellite orbits from celestial mechanics perspectives, whose applications will be detailed further in the follow-up work