bluuebunny/crossref_metadata_2025_split huggingface dataset:
Actin Interacting Protein1 and Actin Depolymerizing Factor Drive Rapid Actin Dynamics inPhyscomitrella patens
Authors: Augustine Robert C. , Pattavina Kelli A. , Tüzel Erkan , Vidali Luis , Bezanilla Magdalena 
Published: October 2011

AbstractThe remodeling of actin networks is required for a variety of cellular processes in eukaryotes. In plants, several actin binding proteins have been implicated in remodeling cortical actin filaments (F-actin). However, the extent to which these proteins support F-actin dynamics in planta has not been tested. Using reverse genetics, complementation analyses, and cell biological approaches, we assessed the in vivo function of two actin turnover proteins: actin interacting protein1 (AIP1) and actin depolymerizing factor (ADF). We report that AIP1 is a single-copy gene in the moss Physcomitrella patens. AIP1 knockout plants are viable but have reduced expansion of tip-growing cells. AIP1 is diffusely cytosolic and functions in a common genetic pathway with ADF to promote tip growth. Specifically, ADF can partially compensate for loss of AIP1, and AIP1 requires ADF for function. Consistent with a role in actin remodeling, AIP1 knockout lines accumulate F-actin bundles, have fewer dynamic ends, and have reduced severing frequency. Importantly, we demonstrate that AIP1 promotes and ADF is essential for cortical F-actin dynamics.
The IZA Evaluation Dataset: towards evidence‐based labor policy making
Authors: Caliendo Marco , Falk Armin , Kaiser Lutz C. , Schneider Hilmar , Uhlendorff Arne , van den Berg Gerard , Zimmermann Klaus F. 
Published: October 2011

PurposeThis paper aims to present the IZA Evaluation Dataset, a newly created data source allowing for the evaluation of active labor market policies in Germany.Design/methodology/approachThe paper's approach is a description of the sampling and contents of the IZA Evaluation Dataset and an outline of its research potential.FindingsThe evaluation of active labor market policies is often confronted with a lack of adequate empirical data. The IZA Evaluation Dataset may serve as a role model for the provision of such data.Research limitations/implicationsThe scope of active labor market policy instruments that can be analyzed with the IZA Evaluation Dataset is mainly restricted to measures for unemployed individuals.Originality/valueIn recent years, many countries have opened their administrative databases for evaluation studies. However, information that might be relevant for economic modeling is often absent. The IZA Evaluation Dataset aims to overcome such limitations for Germany by complementing administrative data from the Federal Employment Agency with innovative survey data.
Ethnicity, job search and labor market reintegration of the unemployed
Authors: Constant Amelie F. , Kahanec Martin , Rinne Ulf , Zimmermann Klaus F. 
Published: October 2011

PurposeThis paper seeks to shed further light on the native‐migrant differences in economic outcomes. The aim is to investigate labor market reintegration, patterns of job search, and reservation wages across unemployed migrants and natives in Germany.Design/methodology/approachThe paper is based on the IZA Evaluation Dataset, a recently collected rich survey of a representative sample of entrants into unemployment in Germany. The data include a large number of migration variables, allowing us to adapt a recently developed concept of ethnic identity: the ethnosizer. The authors analyze these data using the OLS technique as well as probabilistic regression models.FindingsThe results indicate that separated migrants have a relatively slow reintegration into the labor market. It can be argued that this group exerts a relatively low search effort and that it has reservation wages which are moderate, yet still above the level which would imply similar employment probabilities as other groups of migrants.Research limitations/implicationsThe findings indicate that special attention needs to be paid by policy makers to various forms of social and cultural integration, as it has significant repercussions on matching in the labor market.Originality/valueThe paper identifies a previously unmapped relationship between ethnic identity and labor market outcomes.
The threat effect of participation in active labor market programs on job search behavior of migrants in Germany
Authors: Bergemann Annette , Caliendo Marco , van den Berg Gerard J. , Zimmermann Klaus F. 
Published: October 2011

PurposeLabor market programs may affect unemployed individuals' behavior before they enroll. The aim of this paper is to study whether such ex ante effects differ according to ethnic origin.Design/methodology/approachThe authors apply a method that relates self‐reported perceived treatment rates and job search behavioral outcomes, such as the reservation wage or search intensity, to each other. German native workers are compared with migrants with a Turkish origin or Central and Eastern European (including Russian) background. Job search theory is used to derive theoretical predictions. The ex ante effect of the German active labor market program (ALMP) system is examined using the novel IZA Evaluation Data Set which includes self‐reported assessments of the variables of interest as well as an unusually detailed amount of information on behavior, attitudes and past outcomes.FindingsIt is found that the ex ante threat effect on the reservation wage and search effort varies considerably among the groups considered.Originality/valueThe study is the first to investigate whether migrants and natives react similarly to the expectation of participating in an ALMP, and whether migrants of different regions of origin react similarly or not.
Social networks, job search methods and reservation wages: evidence for Germany
Authors: Caliendo Marco , Schmidl Ricarda , Uhlendorff Arne 
Published: October 2011

PurposeThis paper aims to analyze the role of social networks on the job search choices of the unemployed. If social networks convey useful information in the job search process, individuals with larger networks should experience a higher productivity of informal search channels. This in turn affects the choice of formal search intensity and the reservation wage. The paper seeks to test these search‐theoretic implications of productive social networks empirically.Design/methodology/approachThe authors use the IZA Evaluation Dataset containing detailed information on job search behavior of recently unemployed individuals. Observing a rich array of personality traits and direct measures of the social network, the authors choose an identification approach based on observable characteristics using least squares and binary probit regression analysis.FindingsThe findings confirm theoretical expectations. Individuals with larger networks use informal search channels more often and shift from formal to informal search. In addition to that, evidence is found for a positive relationship between network size and reservation wages.Research limitations/implicationsThe extent to which networks are used during job search most likely also depends on the quality of the network, which cannot be observed in the data. However, as the network significantly changes the observable formal job search effort of individuals, public job search monitoring policies should take these effects into account.Originality/valueThe paper complements the previous body of literature on the role of social networks in the labor market that predominantly focuses on labor market outcomes. By highlighting the interaction between networks and job search choices the paper improves the understanding of realized labor market outcomes in the presence of networks.
Economic preferences and attitudes of the unemployed
Authors: Constant Amelie F. , Krause Annabelle , Rinne Ulf , Zimmermann Klaus F. 
Published: October 2011

PurposeThe aim of this paper is to study the economic effects of risk attitudes, time preferences, trust and reciprocity and to compare natives and second generation migrants.Design/methodology/approachThis paper is based on the IZA Evaluation Dataset, a recently collected survey of a representative inflow sample into unemployment in Germany. The data include a large number of migrant‐specific variables as well as information about economic preferences and attitudes. This allows an assessment of whether and how unemployed second generation migrants differ from unemployed natives in terms of economic preferences and attitudes.FindingsDifferences are found between the two groups mainly in terms of risk attitudes and positive reciprocity. Second generation migrants have a significantly higher willingness to take risks and they are less likely to have a low amount of positive reciprocity when compared to natives. It was also found that these differences matter in terms of economic outcomes, and more specifically in terms of the employment probability about two months after unemployment entry.Research limitations/implicationsThe findings offer interesting perspectives, e.g. with regard to the design and targeting of active labor market policy. It may be reasonable to specifically focus on less risk averse individuals with measures such as job search requirements and monitoring.Originality/valueThis paper provides novel and direct evidence on the relationship between economic preferences, attitudes and labor market reintegration of natives and second generation migrants.
Automated construction of the user interface for a CERIF‐compliant research management system
Authors: Milosavljević Gordana , Ivanović Dragan , Surla Dušan , Milosavljević Branko 
Published: October 2011

PurposeThis paper aims to examine the goal, which is to construct a user interface for CERIF‐compatible research management systems in an automated way. The system has to support all data items defined by the CERIF data model. The result of the automated construction is a functioning software system that can be customised according to the specific needs by manual changes in the program code.Design/methodology/approachThe Model‐Driven Architecture (MDA) approach to software engineering is based on the idea of automated construction of software applications based on the model of a system. System modelling usually utilises the Unified Modelling Language (UML). A specific UML profile (extension) used for describing user interface‐related aspects of the system model is defined. It is used to define the behaviour of the user interface in the model itself. By relying on the concept of a standard generic screen form implementing common data management operations and tools for automatic code generation it is possible to obtain a fully functional software application that is completely defined by the system model.FindingsA proposal of an automated user interface construction method for CERIF‐compatible research management systems is defined. The proposed application enables the management of all CERIF‐specified data items and facilitates the customisation of the model according to the specific needs. The customisation process is automated by using the tools for user interface code generation based on human‐computer interaction (HCI) standard defining the layout and behaviour of generic screen forms. The amount of automatically generated application functionality justifies the use of the model‐driven approach to software development.Practical implicationsUsing the model of a system it is possible to efficiently produce a functional software application that can further be customised according to the needs of specific institutions and users. The customisation process itself is made efficient since it is iteratively performed using the same cycles of modelling and software generation. The proposed method for automated user interface construction is used for implementing the web application for research management at the University of Novi Sad.Originality/valueA proposal for efficient software system development and its customisation is given. This way a software application is obtained that can be quickly adapted to new requirements and used in different research management systems based on a CERIF‐compatible data model.
Web citation persistence over time: a retrospective study
Authors: Riahinia Nosrat , Zandian Fatemeh , Azimi Ali 
Published: October 2011

PurposeBy studying a large number of citations in the LIS field, this paper seeks to examine carefully the persistence status of web resources specified by their domains and type of files.Design/methodology/approachAll 2005‐2008 volumes of six LIS journals ranked by ISI Thomson Reuters were selected. From 1,181 papers, 37,791 citations were recorded. Only original articles, which had a list of references, were included in the study. The persistence of web citations was checked by directly following the cited URLs.FindingsOf the 37,791 citations, 4,840 (12.8 percent) were web citations. The means per articles of web and print citations were 4.09, and 27.9, respectively. Of all web citations, 4,617 (95 percent) were readily persistent, and 5 percent returned errors and thus were not originally accessible. The relationship between the print and web citation over time (year) was significant. The most prevalent domain of citations was html and the most favorable and persistent file format was pdf.Practical implicationsThe web resources are used for their easy accessibility and the support they provide for a scientific content. While direct accessibility to a web citation is not provided, many strategies are adopted to recover the dead citation. The issue is to what extent the authors rely on web resources and are they finished with citing paper‐based materials? Are web resources becoming replaced with their print counterparts? The study showed that scholars still rely more on print resources than on the web materials.Originality/valueTracking current trends in scholars' communication behavior shows a shift from print to web resources. The paper examines web citations persistence in some prestigious journals to show whether the web citations are reliable enough and always accessible in the digital world.
M‐learning in distance education libraries
Authors: Chandhok Seema , Babbar Parveen 
Published: October 2011

PurposeThe purpose of this paper is to discover the perspectives of M‐Technologies in Distance Education Libraries. It proposes a model for providing e‐resources and other information services through mobile technology to its learners in Indira Gandhi National Open University, India.Design/methodology/approachIn this qualitative study data were gathered through questionnaire and interviews from Distance Learners of IGNOU to access the actual requirement of Distance Learners for various m‐library services in the present scenario. The study is guided conceptually by the perceived need for m‐libraries and a growing usage of mobiles in India.FindingsThe data suggest that M‐Libraries offer a unique opportunity for distance learners in different kinds of learning environment settings. The proposed m‐library services architecture suggests developing an M‐library web site at IGNOU Library to effectively facilitate m‐library services, hence strengthening the M‐Learning in Distance Education System.Originality/valueConsiderably less literature exists about the m‐libraries and its services in Distance Education. This study will be of interest to distance education library and information professionals who wish to obtain a better understanding of M‐Libraries scenario and practices.
An investigation and analysis of the application of Web 2.0 in Chinese university libraries
Authors: Si Li , Shi Ruoyao , Chen Bijuan 
Published: October 2011

PurposeThis paper aims to provide an overall picture of the application of Web 2.0 technologies in Chinese university libraries. The focus of the research is what types of Web 2.0 technologies were applied in such libraries as well as their function and user interface.Design/methodology/approachThe top 30 Chinese university libraries were selected to investigate the application of Web 2.0 technologies. Content analysis was used in terms of quantitative approach. Data were collected by accessing these 30 university libraries web sites within five weeks.FindingsTwo‐thirds of Chinese university libraries deployed one or more Web 2.0 technologies. Only one‐tenth of libraries adopted more than four Web 2.0 technologies. RSS was the most widely applied, while Wiki was the least. The application of Web 2.0 technologies among Chinese university libraries was not extensive and profound enough.Research implicationsThe findings can be utilized to evaluate the status of Web 2.0 technology applications. The statistical data are very useful and authentic sources for improving the level of Web 2.0 technology application. It may enable future research to analyze other aspects (e.g. the application of RSS or Blogs for services).Originality/valueThis unique study explores the application of Web 2.0 mainly in Chinese university libraries that deployed any types of Web 2.0 technologies. This study is very useful for Chinese university libraries in evaluating/deploying Web 2.0. Library managers, librarians, and other libraries may also find this helpful, once they decide to implement such technologies in their libraries.
Impact response of polymer‐coated grinding spheres
Authors: Langus J. , Šuštarič P. , Rodič T. 
Published: October 2011

PurposeThe purpose of this paper is to evaluate the effect that polymer coat has on the impact behavior of grinding sphere and to find possible subsection of parameter space in which grinding sphere wear could be reduced.Design/methodology/approachNumerical analysis is based on axisymmetric finite elements that were developed using symbolic tool AceGen. Comparing stress response of elastic and visco‐elastic material revealed that for high strain rates observed in impacts both behave the same and that is why elastic elements were used in simulations.FindingsImpact velocity, coat thickness and polymer material properties were varied in a parametric case study of polymer‐coated sphere impact. Decrease of the pressure on the surface of grinding sphere indicates that polymer layer can be effective in reducing grinding media wear, but in order to maintain adequate impact pressure to do the grinding the impact velocity has to be increased. Both upper and lower limit for impact velocity were determined for some arbitrary pressure threshold values. This shows that combining measured threshold values of specific material with results from presented numerical tool could provide valuable guides for finding optimum stirred media milling operation parameters.Originality/valueIn this work, the authors develop numerical tools with the aim of supporting experimental development of polymer coat capable of reducing grinding media wear.
Modeling of coupled heat, moisture transfer and mechanical deformations of wood during drying process
Authors: Zhu Zhenggang , Kaliske Michael 
Published: October 2011

PurposeThe purpose of this paper is to present a numerical model of coupled heat, moisture transfer and their effects on the mechanical deformations of wood during the drying process.Design/methodology/approachCoupling among heat, moisture, and mechanical deformations is solved consecutively by use of sparse solver of MATLAB. The weighted residual of the equilibrium equations of drying process of wood, based on finite element method, is investigated. The stress and plastic strain increments can be solved with Newton's method.FindingsThe numerical model is applied to a plain strain problem of a long wood board taken from the outer region of the wood log. Numerical simulation reveals the stress reversal during the drying process. The mechanical deformations and the principle stresses of a three‐dimensional wood board in consideration of the orthotropic properties are presented.Originality/valuePlane strain and plane stress are analysed. The tangential modulus is derived. The transformation of the stress and strain tensors between the local coordinate system resulting from the cylindrical properties of wood and the global one is evaluated. Selection of element type for temperature, moisture content and displacement is discussed.
Modified Mohr‐Coulomb – Rankine material model for concrete
Authors: Galic Mirela , Marovic Pavao , Nikolic Zeljana 
Published: October 2011

PurposeThe main aim of this paper is to present a three‐dimensional numerical material model for concrete which combines plasticity with a classical orthotropic smeared crack formulation. A further aim is to raise a discussion leading to the creation of a comprehensive computer programme for the analyses of reinforced and prestressed concrete structures.Design/methodology/approachA new numerical material model for concrete is developed and main theoretical explanations are given to aid in understanding the algorithm. The model is based on Mohr‐Coulomb criterion for dominant compression and Rankine criterion for dominant tension influences. A multi‐surface presentation of the model is implemented which permits the rapid convergence of the mathematical procedure. The model includes associated and non‐associated flow rules, strain hardening and softening where the development of the plastic strain was described by the function of cohesion.FindingsProvides information about developing a new numerical material model for concrete.Practical implicationsThe model is implemented into the computer programme PRECON3D for the three‐dimensional nonlinear analysis of the reinforced and prestressed concrete structures.Originality/valueIn this model, the very complex behaviour of concrete is defined by elementary material parameters which can be obtained by a standard uniaxial test. The presented model enables a very detailed and precise analysis of reinforced and prestressed concrete structures until crushing with a high accuracy, so that the expensive experimental tests can be reduced. The paper could be very valuable to researchers in this field as a benchmark for their analyses.
Computational steering in the problem solving environment WBCSim
Authors: Shu Jiang , Watson Layne T. , Ramakrishnan Naren , Kamke Frederick A. , Deshpande Shubhangi 
Published: October 2011

PurposeThis paper describes a practical approach to implement computational steering for problem solving environments (PSEs) by using WBCSim as an example. WBCSim is a Web based simulation system designed to increase the productivity of wood scientists conducting research on wood‐based composites manufacturing processes. WBCSim serves as a prototypical example for the design, construction, and evaluation of small‐scale PSEs.Design/methodology/approachVarious changes have been made to support computational steering across the three layers – client, server, developer – comprising the WBCSim system. A detailed description of the WBCSim system architecture is presented, along with a typical scenario of computational steering usage.FindingsThe set of changes and components are: design and add a very simple steering module at the legacy simulation code level, provide a way to monitor simulation execution (alert users when it is time to steer), add an interface to access and visualize simulation results, and perhaps to compare intermediate results across multiple steering attempts. These simple changes and components have a relatively low cost in terms of increasing software complexity.Originality/valueThe novelty lies in designing and implementing a practical approach to enable computational steering capability for PSEs embedded with legacy simulation code.