scholarly journals Magnetic well and Mercier stability of stellarators near the magnetic axis

2020 ◽  
Vol 86 (5) ◽  
Author(s):  
Matt Landreman ◽  
Rogerio Jorge
Keyword(s):  
Stability Criterion ◽  
Arbitrary Shape ◽  
Small Distance ◽  
Magnetic Axis ◽  
Design Approach ◽  
Ideal Condition ◽  
Independent Variables ◽  
Neoclassical Transport ◽  
Major Radius ◽  
Magnetic Well

We have recently demonstrated that by expanding in small distance from the magnetic axis compared with the major radius, stellarator shapes with low neoclassical transport can be generated efficiently. To extend the utility of this new design approach, here we evaluate measures of magnetohydrodynamic interchange stability within the same expansion. In particular, we evaluate the magnetic well, Mercier's criterion, and resistive interchange stability near a magnetic axis of arbitrary shape. In contrast to previous work on interchange stability near the magnetic axis, which used an expansion of the flux coordinates, here we use the ‘inverse expansion’ in which the flux coordinates are the independent variables. Reduced expressions are presented for the magnetic well and stability criterion in the case of quasisymmetry. The analytic results are shown to agree with calculations from the VMEC equilibrium code. Finally, we show that near the axis, Glasser, Greene and Johnson's stability criterion for resistive modes approximately coincides with Mercier's ideal condition.

Toroidal equilibrium of rotating plasma with adiabatic constraints

1994 ◽  
Vol 52 (1) ◽  
pp. 129-140 ◽  
Author(s):  
A. Gałkowski ◽  
R. Żelazny
Keyword(s):  
Equilibrium Problem ◽  
Stability Criterion ◽  
Numerical Technique ◽  
Magnetic Axis ◽  
Governing Equations ◽  
Surface Geometry ◽  
Adiabatic Evolution ◽  
Flux Surface ◽  
Toroidal Plasma

A numerical technique, alternative to Grad's well-known ADM method has been proposed to deal with the slow adiabatic evolution of a toroidal plasma with flow. The equilibrium problem with prescribed adiabatic constraints may be solved by simultaneous calculations of flux surface geometry and original profile functions. Implications for the problem of bifurcation due to nonlinearity of the governing equations are discussed. In the case of field-aligned sub-Alfvénic flow the system is in the second elliptic regime if β <A2/(1 – A2) at the magnetic axis, where A is the Mach Alfvén number of the flow. Super-Alfvénic flows do not satisfy the local firehose stability criterion.

Novel Solid Lipid Nanocarrier of Glibenclamide: A Factorial Design Approach with Response Surface Methodology

2018 ◽  
Vol 24 (16) ◽  
pp. 1811-1820 ◽  
Author(s):  
Sonia Pandey ◽  
Payal Patel ◽  
Arti Gupta
Keyword(s):  
Particle Size ◽  
Factorial Design ◽  
Response Surface ◽  
Entrapment Efficiency ◽  
Water Soluble ◽  
Design Approach ◽  
Therapeutic Effectiveness ◽  
Regression Equations ◽  
Independent Variables ◽  
Solid Lipid

Background: In the present investigation, a factorial design approach attempt was applied to develop the Solid Lipid Nanoparticles (SLN) of Glibenclamide (GLB) a poorly water-soluble drug (BCS -II) used in the treatment of type 2 diabetes. Objectives: Prime objectives of this experiment are to optimize the SLN formulation of Glibenclamide and improve the therapeutic effectiveness of the developed formulation. Methods: Glibenclamide loaded SLNs (GLB-SLN) were fabricated by High speed homogenization technique. A 32-factorial design approach has been employed to assess the influence of two independent variables, namely amount of Poloxamer 188 and Glyceryl Monostearate on entrapment efficiency (% EE) (Y1), Particle Size (nm) (Y2), % drug release at 8hr Q8 (Y3) and 24 hr Q24 (Y4) of prepared SLNs. Differential scanning calorimetry analysis revealed the compatibility of the drug into lipid matrix with a surfactant, while Transmission electron and Scanning electron microscopy studies indicated the size and shape of SLN. Results: The entrapment efficiency, particle size, Q8 and Q24 of the optimized SLNs were 88.93%, 125 nm, 31.12±0.951% and 86.07±1.291% respectively. Optimized GLB-SLN formula was derived from an overlay plot. Three-dimensional response surface plots and regression equations confirmed the corresponding influence of selected independent variables on measured responses. In vivo testing of the GLB-SLN in diabetic albino rats demonstrated the significant antidiabetic effect of GLB-SLN. Conclusion: The hypoglycemic effect obtained by GLB-SLN remained significantly higher than that given by drug alone and marketed formulation, further confirming the higher therapeutic effectiveness of the GLB-SLN formulation. Our findings suggested the feasibility of the investigated system for oral administration of Glibenclamide.

scholarly journals Lagrangian neoclassical transport theory applied to the region near the magnetic axis

2002 ◽  
Vol 9 (9) ◽  
pp. 3946-3960 ◽  
Author(s):  
Shinsuke Satake ◽  
Masao Okamoto ◽  
Hideo Sugama
Keyword(s):  
Transport Theory ◽  
Magnetic Axis ◽  
Neoclassical Transport

On neoclassical transport near the magnetic axis

2000 ◽  
Vol 7 (7) ◽  
pp. 2878-2883 ◽  
Author(s):  
P. Helander
Keyword(s):  
Magnetic Axis ◽  
Neoclassical Transport

scholarly journals Significance of Regulations in Driving Internal Environmental Management among Contractors for GSCM Application

2018 ◽  
Vol 7 (4.38) ◽  
pp. 1025
Author(s):  
Yong Ming Heng ◽  
Zul Zakiyuddin Ahmad Rashid ◽  
Salman Riazi Mehdi Riazi
Keyword(s):  
Environmental Management ◽  
Research Design ◽  
Quantitative Research ◽  
Management Practice ◽  
Design Approach ◽  
Construction Sector ◽  
Internal Environment ◽  
Environment Management ◽  
Independent Variables ◽  
Environmental Management Practice

This paper is aiming to study the significance of Regulations as driver in Internal Environment Management practice as part of GSCM practices. Accordingly, the objectives are to identify the drivers in driving Internal Environmental Management among Contractors for GSCM application and to analyse the significance of Regulations in comparison to other Drivers in driving Internal Environmental Management among Contractors for GSCM application. Quantitative research design approach is employed in this study. The independent variables in this study are the drivers of GSCM implementation in construction sector, while the dependent variable is the level of adoption of Internal Environmental Management for GSCM application in the construction sector. The result shows that Regulations driver is the significant factor for Internal Environmental Management practice. The research is significant in providing all relevant parties insights into the most significant driver in Internal Environmental Management, so that further improvement can be carried out for a successful GSCM application in Malaysia.  

A New Defect in Polyethylene Single Crystals

1973 ◽  
Vol 31 ◽  
pp. 70-71
Author(s):  
E. L. Thomas ◽  
S. L. Sass
Keyword(s):  
Single Crystals ◽  
Screw Dislocation ◽  
Small Distance ◽  
Dipole Model ◽  
Dislocation Dipole ◽  
Chain Folding ◽  
Black And White ◽  
Polymer Crystal ◽  
Different Types

In polyethylene single crystals pairs of black and white lines spaced 700-3,000Å apart, parallel to the [100] and [010] directions, have been identified as microsector boundaries. A microsector is formed when the plane of chain folding changes over a small distance within a polymer crystal. In order for the different types of folds to accommodate at the boundary between the 2 fold domains, a staggering along the chain direction and a rotation of the chains in the plane of the boundary occurs. The black-white contrast from a microsector boundary can be explained in terms of these chain rotations. We demonstrate that microsectors can terminate within the crystal and interpret the observed terminal strain contrast in terms of a screw dislocation dipole model.

Unbiased estimation of particle number and sizes using the new stereological tools: the disector, the fractionator, the selector, and the nucleator — or just point-sampled intercepts

1988 ◽  
Vol 46 ◽  
pp. 428-429
Author(s):  
H.J.G. Gundersen
Keyword(s):  
Particle Number ◽  
Small Distance ◽  
Parallel Plane ◽  
Unbiased Estimation ◽  
Severe Problem ◽  
New Era ◽  
Size And Shape ◽  
Distinct Property ◽  
Sectioned Tissue

Previously, all stereological estimation of particle number and sizes were based on models and notoriously gave biased results, were very inefficient to use and difficult to justify. For all references to old methods and a direct comparison with unbiased methods see recent reviews.The publication in 1984 of the DISECTOR, the first unbiased stereological probe for sampling and counting 3—D objects irrespective of their size and shape, signalled the new era in stereology — and give rise to a number of remarkably simple and efficient techniques based on its distinct property: It is the only known way to obtain an unbiased sample of 3-D objects (cells, organelles, etc). The principle is simple: within a 2-D unbiased frame count or sample only cells which are not hit by a parallel plane at a known, small distance h.The area of the frame and h must be known, which might sometimes in itself be a problem, albeit usually a small one. A more severe problem may arise because these constants are known at the scale of the fixed, embedded and sectioned tissue which is often shrunken considerably.

Analisis Pengaruh Penerimaan Pajak Daerah Dan Retribusi Daerah Terhadap Pendapatan Asli Daerah Kabupaten/Kota Di Jawa Tengah

2015 ◽  
Vol 2 (1) ◽  
pp. 51-61
Author(s):  
Beta Asteria
Keyword(s):  
Local Government ◽  
Government Budget ◽  
Multiple Regressions ◽  
Independent Variables ◽  
Central Java ◽  
Directorate General ◽  
Fiscal Balance ◽  
Research Findings ◽  
Local Government Budget ◽  
The Impact

This research deals with the impact of Local Tax and Retribution Receipt to Local Government Original Receipt of Regency/City in Central Java from 2008 to 2012. This research utilizes the data of actual of local government budget from Directorate General of Fiscal Balance (Direktorat Jendral Perimbangan Keuangan). Methods of collecting data through census. The number of Regency/City in Central Java are 35. But the data consists of 33 of Regency/City In Central Java from 2008 to 2012. Total of samples are 165. Karanganyar Regency and Sukoharjo Regency were not included as samples of this research because they didn’t report the data of actual of local government budget to Directorate General of Fiscal Balance in 2009.The model used in this research is multiple regressions. The independent variables are Local Tax and Retribution Receipt, the dependent variable is Local Government Original Receipt. The research findings show that Local Tax and Retribution give the significant impact partially and simultaneusly on Local Government Original Receipt at real level 5 percent. All independent variables explain 91,90 percent of the revenue variability while the rest 8,10 percent is explained by other variables.Keywords: Local Tax, Retribution, and Local Government Original Receipt

Pengaruh Tekanan Waktu, Locus Of Control , Tindakan Supervisi, Dan Materialitas Terhadap Penghentian Prematur Atas Prosedur Audit Studi Kasus Pada Kantor Akuntan Publik Daerah Istimewa Yogyakarta Tahun 2015

2017 ◽  
Vol 24 (1) ◽  
pp. 35-53
Author(s):  
Sulastiningsih Sulastiningsih ◽  
Intan Ayu Candra
Keyword(s):  
Locus Of Control ◽  
Premature Termination ◽  
Sampling Methods ◽  
Time Pressure ◽  
Linear Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Test Reliability ◽  
Friedman Test ◽  
Independent Variables ◽  
Public Accountant

The purpose of this study is to prove: (1) Time pressure, locus of control, the action of supervision and materiality partially affect the premature termination of the audit procedures (2) Time pressure, locus of control, supervision and materiality simultaneously affect the premature termination on the audit procedures. This research was conducted in Public Accountant firm in Yogyakarta region of which total 12 samples of KAP, by distributing 105 questionnaires, and 57 questionnaires were returned (54%). 34 of the returned questionnaires can be processed (34%). The samples in this study were determined by using non-probability sampling, one of purposive sampling methods. Data analysis consisted of: (1) validity test, reliability test and classical assumption. The result showed that the instruments used are quite reliable and valid (2) multiple linear regression analysis. The results are (a) Some of independent variables partially affect premature termination of the audit procedure, while the action of supervision does not influence premature termination of audit procedures (b) All independent variables influence simultaneously to the premature termination of the audit procedures (c) All independent variables showed that as much as 55% it affects on premature termination of the audit procedures, the rest of it are influenced by other variables. (3) Friedman Test. The result shows that there are order of priority of audit procedures being terminated.

Sign in / Sign up

Export Citation Format

Share Document