Conceptual Framework of Connectivity for a National Agroecosystem Model Based on Transport Processes and Management Practices

Author(s):  
Jeffrey G. Arnold ◽  
Michael J. White ◽  
Peter M. Allen ◽  
Philip W. Gassman ◽  
Katrin Bieger
2021 ◽  
Author(s):  
Ricardo Pérez Indoval ◽  
Javier Rodrigo-Ilarri ◽  
Eduardo Cassiraga

<p>Chlorpyrifos is commoly used as an pesticide to control weeds and prevent nondesirable grow of algae, fungi and bacteria in many agricultural applications. Despite its highly negative effects on human health, environmental modeling of this kind of pesticide in the groundwater is not commonly done in real situations. Predicting the fate of pesticides released into the natural environment is necessary to anticipate and minimize adverse effects both at close and long distances from the contamination source. A number of models have been developed to predict the behavior, mobility, and persistence of pesticides. These models should account for key hydrological and agricultural processes, such as crop growth, pesticide application patterns, transformation processes and field management practices.</p><p>This work shows results obtained by the Pesticide Water Calculator (PWC) model to simulate the behavior of chlorpyrifos. PWC model is used as a standard pesticide simulation model in USA and in this work it has been used to  simulate the fate and transport of chlorpyrifos in the unsaturated zone of the aquifer. The model uses a whole set of parameters to solve a modified version of the mass transport equation considering the combined effect of advection, dispersion and reactive transport processes. PWC is used to estimate the daily concentrations of chlorpyrifos in the Buñol-Cheste aquifer in Valencia Region(Spain).</p><p>A whole set of simulation scenarios have been designed to perform a parameter sensitivity analysis. Results of the PWC model obtained in this study represents a crucial first step towards the development of a pesticide risk assessment in Valencia Region. Results show that numerical simulation is a valid tool for the analysis and prediction of the fate  and transport of pesticides in the groundwater.</p>


2018 ◽  
Vol 9 (2) ◽  
pp. 56
Author(s):  
Attilio Mucelli ◽  
Francesca Spigarelli ◽  
Dominique Lepore

National culture has a well-recognized role in management practices especially in shaping participatory decision-making processes (PDM). The article aims to provide a conceptual framework where national culture is considered as a potential moderator in a PDM when designing a Time-Driven Activity Based Costing (TDABC). The purpose is to identify a set of dimensions when designing time equations, on which the costing system is based on, to be then linked to national culture. Moreover, a research agenda is also presented in order to validate the proposed framework, outlining directions for futures research as well as managerial implications.


2009 ◽  
Vol 6 (12) ◽  
pp. 3035-3051 ◽  
Author(s):  
J. van Huissteden ◽  
A. M. R. Petrescu ◽  
D. M. D. Hendriks ◽  
K. T. Rebel

Abstract. Modelling of wetland CH4 fluxes using wetland soil emission models is used to determine the size of this natural source of CH4 emission on local to global scale. Most process models of CH4 formation and soil-atmosphere CH4 transport processes operate on a plot scale. For large scale emission modelling (regional to global scale) upscaling of this type of model requires thorough analysis of the sensitivity of these models to parameter uncertainty. We applied the GLUE (Generalized Likelihood Uncertainty Analysis) methodology to a well-known CH4 emission model, the Walter-Heimann model, as implemented in the PEATLAND-VU model. The model is tested using data from two temperate wetland sites and one arctic site. The tests include experiments with different objective functions, which quantify the fit of the model results to the data. The results indicate that the model 1) in most cases is capable of estimating CH4 fluxes better than an estimate based on the data avarage, but does not clearly outcompete a regression model based on local data; 2) is capable of reproducing larger scale (seasonal) temporal variability in the data, but not the small-scale (daily) temporal variability; 3) is not strongly sensitive to soil parameters, 4) is sensitive to parameters determining CH4 transport and oxidation in vegetation, and the temperature sensitivity of the microbial population. The GLUE method also allowed testing of several smaller modifications of the original model. We conclude that upscaling of this plot-based wetland CH4 emission model is feasible, but considerable improvements of wetland CH4 modelling will result from improvement of wetland vegetation data.


2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Md Shariful Alam Khandakar ◽  
Faizuniah Pangil

PurposeThe purpose of this paper is to explain the mediation effect of affective commitment on the relationship between human resource management practices and informal workplace learning.Design/methodology/approachThis paper develops a conceptual framework along with propositions by integrating comprehensive literatures, in the field of human resource management, affective commitment and informal workplace learning. Through the review of detail literature and based on the situated learning theory (Lave and Wenger, 1991) and organizational support theory (Eisenberger et al., 1986; Rhoades and Eisenberger, 2002; – and Eisenberger, 2006), it is proposed that eight human resource practices could affect informal workplace learning. Moreover, it is also argued that affective commitment could mediate the relationship between HRM practices and informal workplace learning.FindingsThis paper provides a conceptual framework on human resource management practices and informal workplace learning which is mediated by affective commitment.Originality/valueNone of the models presented in the literature details the mediation of affective commitment on the relationship between human resource management practices and informal workplace learning which is mediated by affective commitment as indeed the most recent research on the subject envisages.


Agronomy ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 239 ◽  
Author(s):  
Guadalupe Tiscornia ◽  
Martín Jaurena ◽  
Walter Baethgen

Natural grasslands are being progressively degraded around the world due to human-induced action (e.g., overgrazing), but there is neither a widely accepted conceptual framework to approach degradation studies nor a clear definition of what “grassland degradation” is. Most of the drivers, processes, and consequences related to grassland degradation are widespread and are usually separately quoted in the literature. In this paper, we propose a comprehensive framework with different conceptual categories, for monitoring grassland degradation, and a new definition based on current ones. We provide a conceptual update of grassland degradation based on a literature review and an expert survey, focused on the Río de la Plata grasslands (RPG). We identified “drivers” as external forces or changes that cause degradation; “processes” as measurable changes in grasslands conditions that can be evaluated using indicators; and “consequences” as the impacts or results of the process of grassland degradation. We expect that this conceptual framework will contribute to monitoring programs, to support management decisions, to design conservation measures, and to communicate the importance of grasslands conservation and the different concepts involved. Particularly for RPG, we expect that this paper will contribute to promote sustainable management practices in this important and often neglected ecosystem.


2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Mazbahul G. Ahamad ◽  
Fahian Tanin

Abstract Objective Field interventions employed to improve preventive health behaviors and outcomes generally use well-established approaches; however, recent studies have reported that health education and promotional interventions have little to no impact on health behaviors, especially in low- and middle-income countries. We aimed to develop a conceptual framework to improve intervention designs that would internalize these concerns and limitations. Results We identified three major experimental design- and implementation-related concerns associated with mental models, including the balance between the treatment and control groups, the treatment group’s willingness to adopt suggested behaviors, and the type, length, frequency, intensity, and sequence of treatments. To minimize the influence of these aspects of an experimental design, we proposed a mental model-based repeated multifaceted (MRM) intervention design framework, which represents a supportive intervention design for the improvement of health education and promotional programs. The framework offers a step-by-step method that can be used for experimental and treatment design and outcome analysis, and that addresses potential implementation challenges.


2013 ◽  
Vol 29 (3) ◽  
pp. 239-254 ◽  
Author(s):  
M. Duru ◽  
C. Jouany ◽  
X. Le Roux ◽  
M.L. Navas ◽  
P. Cruz

AbstractResearch to understand and manage ecosystems to supply services has recently spurred a functional view of their biodiversity. In particular, approaches based on functional traits rather than species diversity are increasingly used to reflect interactions between organisms and their environment. These approaches bring a functional perspective to the study of community structure responses to disturbances and resources, and of their effects on ecosystem functioning and services. From an academic perspective, we propose a conceptual framework based on species functional traits to better infer how grassland management practices (fertilization, defoliation regime) along with abiotic factors influence plant, animal and microbial community composition and a range of services in grassland ecosystems. The core of the framework relies on combinations of plant functional traits and associated microbial features that specifically respond to environmental and management factors and influence ecosystem services. To overcome stakeholders’ difficulty in applying the concept of functional traits, we propose an operational approach implying the mapping of plant communities distributed into five plant functional types (PFTs). The approach was used for fields in grassland-based livestock farms from two French grassland networks. We evaluated its ability to predict a range of services including forage provision and non-market services according to environmental and management drivers. PFT-based plant community composition predicted forage services reasonably well but responded weakly to environmental gradients. To cope with the observed limitations of current predictive approaches, we suggest including soil microbial functional types and adaptive management rather than using a prescriptive scheme.


2021 ◽  
Author(s):  
◽  
Chootima Longjit

<p>This thesis develops the concept of destination management with a particular focus on the management of a local destination. It concentrates on seeking to understand what constitutes the general concept of destination management, exploring management practices, and clarifying the overall management of the local destination. In the absence of previous literature, a conceptual framework is developed from the bodies of literature in tourism, management, inter-organizational relationships, and integrated coastal management. This framework illustrates aspects, issues, and dimensions that are relevant to destination management and provides a structure for the analysis of destination management in Pattaya, Thailand. Given the exploratory nature of the study, a multi-phase case study is used. A mix of holistic and embedded cases is used to obtain broad and in-depth data relevant to the concept and practice of destination management. Pattaya, as one of the major coastal resorts in Thailand, is selected as the case study as tourism has been developed there for several decades and its diverse problems provide a range of management challenges. Its major tourism attractions - beaches, nightlife, Pattaya Music Festival - are examined as embedded cases. In addition to secondary data, semi-structured interviews and observation are used to collect primary data. The broad concept of destination management is developed first and then used as a basis to examine the nature and extent of destination management in Pattaya. The conceptual framework provides a structure to analyze the individual embedded cases and to compare commonalities and differences between their management processes and structures and their implications for the practice of destination management. The research reveals that there is a relationship between the practitioners' perspectives on a tourism destination and on destination management, and that there is a relationship between their initial perspectives on destination management and their management practices that occur at the destination. Destination management is defined as "the collaboration of relevant agencies responsible for providing multiple tourism products at the destination in a way to achieve common goals or destination goals." The research also highlights that destination management requires the integration of management agencies, of management purposes, and of management activities at the destination scale. In Pattaya, varying levels of integration occur and relevant agencies are commonly involved with managing aspects of tourism rather than the destination as a whole. The embedded cases reveal that two main forms of management occur in Pattaya: daily operations and project management. Daily management is practised by single agencies to achieve individual organizational goals and is evident in most aspects of beach management and the management of dispersed nightlife activities. Project-based management involves the pursuit of project goals and is carried out by committees, for example, Walking Street Committee and the Pattaya Music Festival Committees. A lack of common goals and low levels of integration are factors which lead to an absence of destination management. The formulation of destination goals and a scaled-up project management structure is suggested as one means of fostering destination management.</p>


ETIKONOMI ◽  
2020 ◽  
Vol 19 (2) ◽  
Author(s):  
Ruspita Rani Pertiwi ◽  
Jann Hidayat Tjakraatmadja ◽  
Hary Febriansyah

This conceptual paper aims to develop an integrated organizational performance model. The analysis will focus on the role of organizational management variables using Indonesian Islamic banking as a case study and features a correlation between how they manage their performance. The model developed in this paper uses a conceptualization phase adapted from Dubin's theory-building method. The conceptualization phase formed through interviews, observations, written expert experiences, and research publications. The finding proposes a conceptual framework that has the potential to boost organization performance by pay attention to how to bring together service innovation, knowledge management capability, and human capital drivers in such a model. The findings provide valuable insights for organizations into non-financial variables' role and the importance of organizational management variables in improving organizational performance, which could help them in (re-) align their management practices and formulating strategies for Indonesian Islamic banking.JEL Classification: L2, L8How to Cite:Pertiwi, R. R. (2020). Indonesian Islamic Banking Performance: A Conceptual Framework. Etikonomi: Jurnal Ekonomi, 19(2), xx – xx. https://doi.org/10.15408/etk.v19i2.16270.


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