scholarly journals Numerical criteria for divisors on to be ample

2009 ◽  
Vol 145 (5) ◽  
pp. 1227-1248 ◽  
Author(s):  
Angela Gibney
Keyword(s):  
Moduli Space ◽  
General Type ◽  
Topological Type ◽  
Rational Curves ◽  
Canonical Divisor ◽  
Content Type ◽  
One Dimensional ◽  
Stable Curves ◽  
The One ◽  
Ample Divisors

AbstractThe moduli space $\M _{g,n}$ of n-pointed stable curves of genus g is stratified by the topological type of the curves being parameterized: the closure of the locus of curves with k nodes has codimension k. The one-dimensional components of this stratification are smooth rational curves called F-curves. These are believed to determine all ample divisors. F-conjecture A divisor on $\M _{g,n}$ is ample if and only if it positively intersects theF-curves. In this paper, proving the F-conjecture on $\M _{g,n}$ is reduced to showing that certain divisors on $\M _{0,N}$ for N⩽g+n are equivalent to the sum of the canonical divisor plus an effective divisor supported on the boundary. Numerical criteria and an algorithm are given to check whether a divisor is ample. By using a computer program called the Nef Wizard, written by Daniel Krashen, one can verify the conjecture for low genus. This is done on $\M _g$ for g⩽24, more than doubling the number of cases for which the conjecture is known to hold and showing that it is true for the first genera such that $\M _g$ is known to be of general type.

scholarly journals The One-Dimensional Stratum in the Boundary of the Moduli Stack of Stable Curves

2009 ◽  
Vol 196 ◽  
pp. 27-66
Author(s):  
Jörg Zintl
Keyword(s):  
Moduli Space ◽  
Fixed Number ◽  
One Dimensional ◽  
Stable Curves ◽  
Moduli Stack ◽  
The One

It is well-known that the moduli space of Deligne-Mumford stable curves of genus g admits a stratification by the loci of stable curves with a fixed number i of nodes, where 0 ≤ i ≤ 3g - 3. There is an analogous stratification of the associated moduli stack .

Revising the Kano model for designing an employee compensation system

2019 ◽  
Vol 32 (1) ◽  
pp. 78-91
Author(s):  
Hossein Vaez Shahrestani ◽  
Arash Shahin ◽  
Hadi Teimouri ◽  
Ali Shaemi Barzoki
Keyword(s):  
Design Methodology ◽  
Compensation System ◽  
Kano Model ◽  
Employee Compensation ◽  
Content Type ◽  
One Dimensional ◽  
Compensation Systems ◽  
Proposed Model ◽  
The One

Purpose The purpose of this paper is twofold: first, to revise the Kano model with a focus on one-dimensional attributes; and second, to use the revised model for categorizing and prioritizing various employee compensation strategies. Design/methodology/approach The Kano evaluation table has been revised and the one-dimensional attribute has been further extended to three categories of OO, OM and OA. In the next step, the literature review-based identified strategies have been categorized and prioritized according to the developed Kano model. Consequently, an employee compensation system has been proposed to a process-based manufacturing company as a case study. Findings Findings indicated that out of the 44 employee compensation strategies, typically 6 were must-be, 13 were one-dimensional, 18 were attractive and 7 were indifferent. Also, the results of the revised Kano model indicated that typically out of the 13 one-dimensional strategies, 7 were one-dimensional tending toward must-be (OM); and 6 were one-dimensional tending toward attractive (OA). Research limitations/implications The case study was limited to one company. The validity of the proposed model can be further studied in a larger population. This study provides managers with a more accurate instrument of decision making in selecting more differentiated employee compensation strategies, which, in turn, might lead to more employee satisfaction. Originality/value Theoretically, this study is different from existing studies, since almost none of the previous studies extended the Kano evaluation table for one-dimensional attributes. Practically, this study is another evidence of the application of the Kano model in the field of human resource management and in particular contributes to the design of employee compensation systems.

Where are fossil fuels prices heading?

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Pierre Rostan ◽  
Alexandra Rostan
Keyword(s):  
Design Methodology ◽  
Fossil Fuels ◽  
Discrete Wavelet ◽  
Energy Prices ◽  
Content Type ◽  
One Dimensional ◽  
West Texas ◽  
Heating Oil ◽  
The One

Purpose The purpose of this paper is to present forecasts of fossil fuels prices until 2030 with spectral analysis to provide a clearer picture of this energy sector. Design/methodology/approach Fossil fuels prices time series are decomposed in simpler signals called approximations and details in the framework of the one-dimensional discrete wavelet analysis. The simplified signals are recomposed after Burg extension. Findings In 2019-2030 average price forecasts of: West Texas intermediate (WTI) oil ($58.67) is above its 1986-2030 long-term mean of $47.83; and coal ($81.01) is above its 1980-2030 long-term mean of $60.98. On the contrary, 2019-2030 average of price forecasts of: Henry Hub natural gas ($3.66) is below its 1997-2030 long-term mean of $4; heating oil ($0.64) is below its 1986-2030 long-term mean of $1.16; propane ($0.26) is below its 1992-2030 long-term mean of $0.66; and regular gasoline ($1.45) is below its 2003-2030 long-term mean of $1.87. Originality/value Fossil fuels prices projections may relieve participants of WTI oil and coal markets but worry participants of Henry Hub, heating oil, propane and regular gasoline markets including countries whose economy is tied to energy prices.

The tragedy of Mariana in management’s tragedy

2019 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Carolina Machado Saraiva ◽  
Pamella Thaís Magalhães Ferreira
Keyword(s):  
Design Methodology ◽  
Corporate Crime ◽  
Social Factor ◽  
Content Type ◽  
One Dimensional ◽  
Critical Studies ◽  
Analysis Technique ◽  
The Media ◽  
The One ◽  
Parent Companies

Purpose This paper aims to unveil the spheres that were silenced by the media and academia with regard to the collapse of the Fundão Dam that occurred in 2015, in Mariana (Minas Gerais - Brazil). Design/methodology/approach In an attempt to contribute to studies into the evil side of organizations, the authors use the theoretical contributions of corporate crime and the one-dimensional society. The authors used the “Samarco Mud” corporate crime case as an object of analysis, while a press conference with the company’s CEO and representatives from its parent companies was used as the analytical corpus. For the analysis, the authors used the content analysis technique. Findings The conclusions of this study point to the existence of subjects who were silenced about the phenomenon of the Fundão Dam collapse, a situation that reveals the power exercised by corporations and the totalitarian domination of the one-dimensional society as a social factor that favors the occurrence of corporate crimes. Originality/value The case in question is recent and not fully understood by academia. Neither is its organization around political and social movements understood with regard to the management implications for society and the environment. With a discussion that mixes the concepts of corporate crime and the one-dimensional society, this paper contributes to the base of critical studies in management, especially as far as concerns the mining policies used in the Southern Hemisphere.

Multi-scale analysis for helically wound structures with one-dimensional periodicity

2019 ◽  
Vol 36 (8) ◽  
pp. 2911-2928
Author(s):  
Jun Yan ◽  
Haitao Hu ◽  
Zhixun Yang ◽  
Rui Wan ◽  
Yang Li
Keyword(s):  
Finite Element ◽  
Axial Length ◽  
Homogenization Theory ◽  
Scale Analysis ◽  
Asymptotic Homogenization ◽  
Content Type ◽  
One Dimensional ◽  
Multi Scale ◽  
The One ◽  
Multi Scale Analysis

Purpose The purpose of this study is to present a multi-scale analysis methodology for calculating the effective stiffnesses and the micro stresses of helically wound structures efficiently and accurately. The helically wound structure is widely applied in ocean and civil engineering as load-bearing structures with high flexibility, such as wire ropes, umbilical cables and flexible risers. Their structures are usually composed of a number of twisted subcomponents with relatively large slender ratio and have the one-dimensional periodic characteristic in the axial direction. As the huge difference between the axial length and the cross-section size of this type of structures, the finite element modeling and theoretical analysis based on some assumption are usually unavailable leading to the reduction of computability; even the optimization design becomes infeasible. Design/methodology/approach Based on the asymptotic homogenization theory, the one-dimensional periodic helically wound structure is equivalent to the one-dimensional homogeneous beam. A novel implementation of the homogenization is derived for the analysis of the effective mechanical properties of the helically wound structure, and the tensile, bending, torsional and coupling stiffness properties of the effective beam model are obtained. On this basis, a downscaling analysis formation for the micro-component stress in the one-dimensional periodic wound structure is constructed. The stress of micro-components in the specified geometry position of the helically wound structure is obtained basing on the asymptotic homogenization theory simultaneously. Findings By comparing with the result from finite element established accurately, the established multi-scale calculation method of the one-dimensional periodic helically wound structure is verified. The influence of size effects on the macro effective performance and the micro-component stress is discussed. Originality/value This paper will provide the theoretical basis for the efficient elastoplastic analysis of the helically wound structure, even the fatigue analysis. In addition, it is necessary to point out that the axial length of the helically wound structure in the general engineering problems that such as deep-sea risers and submarine cables.

Approximate analytical solution for the one-dimensional nonlinear Boussinesq equation

2015 ◽  
Vol 25 (4) ◽  
pp. 831-840 ◽  
Author(s):  
Hossein Aminikhah
Keyword(s):  
Exact Solution ◽  
Laplace Transform ◽  
Arbitrary Function ◽  
Perturbation Methods ◽  
Boussinesq Equation ◽  
Approximate Solutions ◽  
Content Type ◽  
One Dimensional ◽  
Homotopy Perturbation ◽  
The One

Purpose – The purpose of this paper is to provide closed-form approximate solutions to the one-dimensional Boussinesq equation for a semi-infinite aquifer when the hydraulic head at the source is an arbitrary function of time. Combination of the Laplace transform and homotopy perturbation methods (LTHPM) are considered as an algorithm which converges rapidly to the exact solution of the nonlinear Boussinesq equation. Design/methodology/approach – The authors present the solution of nonlinear Boussinesq equation by combination of Laplace transform and new homotopy perturbation methods. An important property of the proposed method, which is clearly demonstrated in example, is that spectral accuracy is accessible in solving specific nonlinear nonlinear Boussinesq equation which has analytic solution functions. Findings – The authors proposed a combination of Laplace transform method and homotopy perturbation method to solve the one-dimensional Boussinesq equation. The results are found to be in excellent agreement. The results show that the LTNHPM is an effective mathematical tool which can play a very important role in nonlinear sciences. Originality/value – The authors provide closed-form approximate solutions to the one-dimensional Boussinesq equation for a semi-infinite aquifer when the hydraulic head at the source is an arbitrary function of time. In this work combination of Laplace transform and new homotopy perturbation methods (LTNHPM) are considered as an algorithm which converges rapidly to the exact solution of the nonlinear Boussinesq equation.

How to measure B2B relationship value to increase satisfaction and loyalty

2019 ◽  
Vol 34 (8) ◽  
pp. 1866-1878
Author(s):  
Alfonso Ruiz-Martínez ◽  
Marta Frasquet ◽  
Irene Gil-Saura
Keyword(s):  
Least Squares ◽  
Partial Least Squares ◽  
Design Methodology ◽  
Dimensional Structure ◽  
Content Type ◽  
One Dimensional ◽  
Relationship Value ◽  
The One ◽  
Practical Implications

Purpose The purpose of this paper is to analyse the dimensional structure of relationship value by comparing the results of one-dimensional versus multidimensional conceptualisation in the prediction of satisfaction and loyalty in a B2B context. Design/methodology/approach A survey was carried out and 219 responses were obtained from retail companies in the furniture sector in Spain. The model was estimated using the partial least squares (PLS) approach. Findings The results revealed that the multidimensional conceptualisation of relationship value explained satisfaction and loyalty levels to a greater extent than the one-dimensional conceptualisation. Research limitations/implications Given the complexity involved in conceptualising relationship value, its study needs to be expanded to encompass other contexts. Practical implications Manufacturers should focus their efforts on improving each of the axes of relationship value, to ensure the satisfaction and loyalty of their retail customers. Originality/value This study integrates and justifies the measurement of relationship value and its axes in the nomological structure with other relational constructs.

Exploring the Multidimensional Facets of Authoritarianism: Authoritarian Aggression and Social Dominance Orientation

2008 ◽  
Vol 67 (1) ◽  
pp. 51-60 ◽  
Author(s):  
Stefano Passini
Keyword(s):  
Social Dominance ◽  
Factor Model ◽  
Three Dimensional ◽  
Social Dominance Orientation ◽  
Model Fit ◽  
Regression Analyses ◽  
One Dimensional ◽  
Confirmatory Factor ◽  
The One ◽  
Better Than

The relation between authoritarianism and social dominance orientation was analyzed, with authoritarianism measured using a three-dimensional scale. The implicit multidimensional structure (authoritarian submission, conventionalism, authoritarian aggression) of Altemeyer’s (1981, 1988) conceptualization of authoritarianism is inconsistent with its one-dimensional methodological operationalization. The dimensionality of authoritarianism was investigated using confirmatory factor analysis in a sample of 713 university students. As hypothesized, the three-factor model fit the data significantly better than the one-factor model. Regression analyses revealed that only authoritarian aggression was related to social dominance orientation. That is, only intolerance of deviance was related to high social dominance, whereas submissiveness was not.

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