Sample records for relaxation unit commitment

  1. Fuzzy Array Approach to Unit Commitment

    Jantzen, Jan; Eliasson, Bo


    The paper investigates the unit commitment problem of Swedish power company Sydkraft as a constraint satisfaction problem. The power system is a simplified system with nuclear, thermal, and hydro generators as well as power interchange. In this paper we focus on soft constraints, for instance `ap...... `approximately equal`, `much larger than`, and `a little`. Several authors have recognized the significance of soft or fuzzy constraints. Our specific objective is to compute a power balance by means of fuzzy array logic in order to accommodate uncertainty....

  2. Neural Based Tabu Search method for solving unit commitment problem with cooling-banking constraints

    Rajan Asir Christober Gnanakkan Charles


    Full Text Available This paper presents a new approach to solve short-term unit commitment problem (UCP using Neural Based Tabu Search (NBTS with cooling and banking constraints. The objective of this paper is to find the generation scheduling such that the total operating cost can be minimized, when subjected to a variety of constraints. This also means that it is desirable to find the optimal generating unit commitment in the power system for next H hours. A 7-unit utility power system in India demonstrates the effectiveness of the proposed approach; extensive studies have also been performed for different IEEE test systems consist of 10, 26 and 34 units. Numerical results are shown to compare the superiority of the cost solutions obtained using the Tabu Search (TS method, Dynamic Programming (DP and Lagrangian Relaxation (LR methods in reaching proper unit commitment.

  3. An unit commitment model for hydrothermal systems; Um modelo de unit commitment para sistemas hidrotermicos

    Franca, Thiago de Paula; Luciano, Edson Jose Rezende; Nepomuceno, Leonardo [Universidade Estadual Paulista (UNESP), Bauru, SP (Brazil). Dept. de Engenharia Eletrica], Emails:,,


    A model of Unit Commitment to hydrothermal systems that includes the costs of start/stop of generators is proposed. These costs has been neglected in a good part of the programming models for operation of hydrothermal systems (pre-dispatch). The impact of the representation of costs in total production costs is evaluated. The proposed model is solved by a hybrid methodology, which involves the use of genetic algorithms (to solve the entire part of the problem) and sequential quadratic programming methods. This methodology is applied to the solution of an IEEE test system. The results emphasize the importance of representation of the start/stop in the generation schedule.

  4. A variant of the dynamic programming algorithm for unit commitment of combined heat and power systems

    Rong, Aiying; Hakonen, Henri; Lahdelma, Risto


    in the system, the number of periods over the planning horizon and the time for solving a single-period economic dispatch problem. We have compared the DP-RSC1 algorithm with realistic power plants against the unit decommitment algorithm and the traditional priority listing method. The results show that the DP...... introduce in this paper the DP-RSC1 algorithm, which is a variant of the dynamic programming (DP) algorithm based on linear relaxation of the ON/OFF states of the units and sequential commitment of units one by one. The time complexity of DP-RSC1 is proportional to the number of generating units...

  5. Ant Colony Search Algorithm for Solving Unit Commitment Problem

    M.Surya Kalavathi


    Full Text Available In this paper Ant Colony Search Algorithm is proposed to solve thermal unit commitment problem. Ant colony search (ACS studies are inspired from the behavior of real ant colonies that are used to solve function or combinatorial optimization problems. In the ACSA a set of cooperating agents called ants cooperates to find good solution of unit commitment problem of thermal units. The UC problem is to determine a minimal cost turn-on and turn-off schedule of a set of electrical power generating units to meet a load demand while satisfying a set of operational constraints. This proposed approach is a tested on 10 unit power system and compared to conventional methods.

  6. A technique for unit commitment with energy storage system

    Senjyu, Tomonobu; Miyagi, Tsukasa; Ahmed Yousuf, Saber; Urasaki, Naomitsu [Faculty of Engineering, University of the Ryukyus, 1 Senbaru, Nishihara-cho Nakagami, Okinawa 903-0213 (Japan); Funabashi, Toshihisa [Meidensha Corporation, Riverside Building 36-2, Nihonbashi, Hokozakicho, Chuo-ku, Tokyo 103-8515 (Japan)


    This paper introduces the scheduling method for thermal and energy storage system (ESS) unit commitment. The ESS is incorporated to achieve peak load-levelling and reduce the total cost. The thermal scheduling is implemented by the extended priority list (EPL) method. The EPL method consists of two steps, in the first step we get rapidly some initial unit commitment schedules by the priority list (PL) method. In this step, operational constraints are disregarded. In the second step, unit schedules are modified using the problem specific heuristics to fulfill operational constraints and to reduce the total cost. To calculate efficiently, heuristics are only applied to solutions which can be expected improvement. The ramp constraints for thermal unit are considered at the last of EPL method. The ESS scheduling is carried out based on the thermal unit schedule obtained by the EPL method. Several numerical examples demonstrate the effectiveness of the proposed method. (author)

  7. Optimization of unit commitment based on genetic algorithms

    蔡兴国; 初壮


    How to solve unit commitment and load dispatch of power system by genetic algorithms is discussed in this paper. A combination encoding scheme of binary encoding and floating number encoding and corresponding genetic operators are developed. Meanwhile a contract mapping genetic algorithm is used to enhance traditional GA' s convergence. The result of a practical example shows that this algorithm is effective.

  8. Accelerating Computation of the Unit Commitment Problem (Presentation)

    Hummon, M.; Barrows, C.; Jones, W.


    Production cost models (PCMs) simulate power system operation at hourly (or higher) resolution. While computation times often extend into multiple days, the sequential nature of PCM's makes parallelism difficult. We exploit the persistence of unit commitment decisions to select partition boundaries for simulation horizon decomposition and parallel computation. Partitioned simulations are benchmarked against sequential solutions for optimality and computation time.

  9. Neural networks as a tool for unit commitment

    Rønne-Hansen, Peter; Rønne-Hansen, Jan


    Some of the fundamental problems when solving the power system unit commitment problem by means of neural networks have been attacked. It has been demonstrated for a small example that neural networks might be a viable alternative. Some of the major problems solved in this initiating phase form...

  10. Security-constrained unit commitment with flexible operating modes

    Lu, Bo

    The electricity industry throughout the world, which has long been dominated by vertically integrated utilities, is facing enormous challenges. To enhance the competition in electricity industry, vertically integrated utilities are evolving into a distributed and competitive industry in which market forces drive the price of electricity and possibly reduce the net cost of supplying electrical loads through increased competition. To excel in the competition, generation companies (GENCOs) will acquire additional generating units with flexible operating capability which allows a timely response to the continuous changes in power system conditions. This dissertation considers the short-term scheduling of generating units with flexible modes of operation in security-constrained unit commitment (SCUC). Among the units considered in this study are combined cycle units, fuel switching/blending units, photovoltaic/battery system, pumped-storage units, and cascaded hydro units. The proposed security-constrained unit commitment solution will include a detailed model of transmission system which could impact the short-term scheduling of units with flexible operation modes.

  11. A dynamic regrouping based sequential dynamic programming algorithm for unit commitment of combined heat and power systems

    Rong, Aiying; Hakonen, Henri; Lahdelma, Risto


    This paper addresses the unit commitment (UC) in multi-period combined heat and power (CHP) production planning under the deregulated power market. In CHP plants (units), generation of heat and power follows joint characteristics, which implies that it is difficult to determine the relative cost...... efficiency of the plants. We introduce in this paper the DRDP-RSC algorithm, which is a dynamic regrouping based dynamic programming (DP) algorithm based on linear relaxation of the ON/OFF states of the units, sequential commitment of units in small groups. Relaxed states of the plants are used to reduce...... the dimension of the UC problem and dynamic regrouping is used to improve the solution quality. Numerical results based on real-life data sets show that this algorithm is efficient and optimal or near-optimal solutions with very small optimality gap are obtained....



    limits, minimum up/down times. Other ... incremental heat rate in ₦/hour for unit i ... approaches to treating thermal unit during its ... (d) Load Balance: During each interval of time, k, the .... The unit information and initial conditions are shown in.

  13. A Stochastic Unit Commitment Model for a Local CHP Plant

    Ravn, Hans V.; Riisom, Jannik; Schaumburg-Müller, Camilla


    Local CHP development in Denmark has during the 90’s been characterised by large growth primarily due to government subsidies in the form of feed-in tariffs. In line with the liberalisation process in the EU, Danish local CHPs of a certain size must operate on market terms from 2005. This paper...... presents a stochastic unit commitment model for a single local CHP plant (consisting of CHP unit, boiler, and heat storage facility) which takes into account varying spot prices. Further, additional technology is implemented in the model in the form of an immersion heater. Simulations are conducted using...

  14. Optimizing Combination of Units Commitment Based on Improved Genetic Algorithms

    LAI Yifei; ZHANG Qianhua; JIA Junping


    GAs are general purpose optimization techniques based on principles inspired from the biological evolution using metaphors of mechanisms, such as natural selection, genetic recombination and survival of the fittest. By use of coding betterment, the dynamic changes of the mutation rate and the crossover probability, the dynamic choice of subsistence, the reservation of the optimal fitness value, a modified genetic algorithm for optimizing combination of units in thermal power plants is proposed.And through taking examples, test result are analyzed and compared with results of some different algorithms. Numerical results show available value for the unit commitment problem with examples.

  15. A Randomized Clinical Trial of Acceptance and Commitment Therapy versus Progressive Relaxation Training for Obsessive-Compulsive Disorder

    Twohig, Michael P.; Hayes, Steven C.; Plumb, Jennifer C.; Pruitt, Larry D.; Collins, Angela B.; Hazlett-Stevens, Holly; Woidneck, Michelle R.


    Objective: Effective treatments for obsessive-compulsive disorder (OCD) exist, but additional treatment options are needed. The effectiveness of 8 sessions of acceptance and commitment therapy (ACT) for adult OCD was compared with progressive relaxation training (PRT). Method: Seventy-nine adults (61% female) diagnosed with OCD (mean age = 37…

  16. A Randomized Clinical Trial of Acceptance and Commitment Therapy versus Progressive Relaxation Training for Obsessive-Compulsive Disorder

    Twohig, Michael P.; Hayes, Steven C.; Plumb, Jennifer C.; Pruitt, Larry D.; Collins, Angela B.; Hazlett-Stevens, Holly; Woidneck, Michelle R.


    Objective: Effective treatments for obsessive-compulsive disorder (OCD) exist, but additional treatment options are needed. The effectiveness of 8 sessions of acceptance and commitment therapy (ACT) for adult OCD was compared with progressive relaxation training (PRT). Method: Seventy-nine adults (61% female) diagnosed with OCD (mean age = 37…

  17. Symmetry Breaking in MILP Formulations for Unit Commitment Problems

    Lima, Ricardo


    This paper addresses the study of symmetry in Unit Commitment (UC) problems solved by Mixed Integer Linear Programming (MILP) formulations, and using Linear Programming based Branch & Bound MILP solvers. We propose three sets of symmetry breaking constraints for UC MILP formulations exhibiting symmetry, and its impact on three UC MILP models are studied. The case studies involve the solution of 24 instances by three widely used models in the literature, with and without symmetry breaking constraints. The results show that problems that could not be solved to optimality within hours can be solved with a relatively small computational burden if the symmetry breaking constraints are assumed. The proposed symmetry breaking constraints are also compared with the symmetry breaking methods included in two MILP solvers, and the symmetry breaking constraints derived in this work have a distinct advantage over the methods in the MILP solvers.

  18. Relaxing Oscillation of the Machine-Unit

    Bohumil Skala


    Full Text Available To understand the behavior of the Earth´s geomagnetic field, many theories have been created. One of the possible approaches is the Rikitake dynamo and chaotic theory. This paper describes the first step, i.e. how to verify the chaotic theory simulated result by a practical test. This first step is the oscillating machine unit. The asynchronous motor working point is moving from the stable part of its torque characteristic to the labile part due to the enormous loading. In the labile part the speed slows down and loading has to be decreased. Then the motor moves back to the stable part of characteristic.

  19. United States commitment to heavy lift launch vehicles

    Gabris, Edward A.

    Observers of the United States' space program will note progress toward the development of a new launch system capable of supporting the nation's future space missions. The process of defining mission requirements, developing technically and politically acceptable solutions, making policy decisions, and developing budget support in a democratic society is protracted, but eventually yields decisions that represent the public interest. The consensus developing within the United States on a new launch capability including heavy-lift is embodied in the Joint NASA/DoD National Launch System. This launch vehicle concept has emerged after more than five years of studies by NASA, the DoD and every major industrial aerospace contractor in the U.S. In July 1991, Vice President Quayle, in his capacity as Chairman of the National Space Council stated the Nation's commitment to support of the NLS. This paper reviews progress to date, and the involvement of the four major constituencies; the Executive Branch operating through the National Space Council, the Legislative Branch, the various elements of the DoD, and NASA. The evolution of launch system "requirements", along with the form, content and rationale for the various decisions that have been made will be described and discussed.

  20. Fuzzy unit commitment solution - A novel twofold simulated annealing approach

    Saber, Ahmed Yousuf; Senjyu, Tomonobu; Yona, Atsushi; Urasaki, Naomitsu [Faculty of Engineering, University of the Ryukyus, 1 Senbaru, Nishihara-cho Nakagami, Okinawa 903-0213 (Japan); Funabashi, Toshihisa [Meidensha Corporation, Riverside Building 36-2, Tokyo 103-8515 (Japan)


    The authors propose a twofold simulated annealing (twofold-SA) method for the optimization of fuzzy unit commitment formulation in this paper. In the proposed method, simulated annealing (SA) and fuzzy logic are combined to obtain SA acceptance probabilities from fuzzy membership degrees. Fuzzy load is calculated from error statistics and an initial solution is generated by a priority list method. The initial solution is decomposed into hourly-schedules and each hourly-schedule is modified by decomposed-SA using a bit flipping operator. Fuzzy membership degrees are the selection attributes of the decomposed-SA. A new solution consists of these hourly-schedules of entire scheduling period after repair, as unit-wise constraints may not be fulfilled at the time of an individual hourly-schedule modification. This helps to detect and modify promising schedules of appropriate hours. In coupling-SA, this new solution is accepted for the next iteration if its cost is less than that of current solution. However, a higher cost new solution is accepted with the temperature dependent total cost membership function. Computation time of the proposed method is also improved by the imprecise tolerance of the fuzzy model. Besides, excess units with the system dependent probability distribution help to handle constraints efficiently and imprecise economic load dispatch (ELD) calculations are modified to save the execution time. The proposed method is tested using standard reported data sets. Numerical results show an improvement in solution cost and time compared to the results obtained from other existing methods. (author)

  1. Security-Constrained Unit Commitment Based on a Realizable Energy Delivery Formulation

    Hongyu Wu


    Full Text Available Security-constrained unit commitment (SCUC is an important tool for independent system operators in the day-ahead electric power market. A serious issue arises that the energy realizability of the staircase generation schedules obtained in traditional SCUC cannot be guaranteed. This paper focuses on addressing this issue, and the basic idea is to formulate the power output of thermal units as piecewise-linear function. All individual unit constraints and systemwide constraints are then reformulated. The new SCUC formulation is solved within the Lagrangian relaxation (LR framework, in which a double dynamic programming method is developed to solve individual unit subproblems. Numerical testing is performed for a 6-bus system and an IEEE 118-bus system on Microsoft Visual C# .NET platform. It is shown that the energy realizability of generation schedules obtained from the new formulation is guaranteed. Comparative case study is conducted between LR and mixed integer linear programming (MILP in solving the new formulation. Numerical results show that the near-optimal solution can be obtained efficiently by the proposed LR-based method.

  2. Solving Unit Commitment Problem Using Modified Subgradient Method Combined with Simulated Annealing Algorithm

    Ümmühan Başaran Filik


    Full Text Available This paper presents the solving unit commitment (UC problem using Modified Subgradient Method (MSG method combined with Simulated Annealing (SA algorithm. UC problem is one of the important power system engineering hard-solving problems. The Lagrangian relaxation (LR based methods are commonly used to solve the UC problem. The main disadvantage of this group of methods is the difference between the dual and the primal solution which gives some significant problems on the quality of the feasible solution. In this paper, MSG method which does not require any convexity and differentiability assumptions is used for solving the UC problem. MSG method depending on the initial value reaches zero duality gap. SA algorithm is used in order to assign the appropriate initial value for MSG method. The major advantage of the proposed approach is that it guarantees the zero duality gap independently from the size of the problem. In order to show the advantages of this proposed approach, the four-unit Tuncbilek thermal plant and ten-unit thermal plant which is usually used in literature are chosen as test systems. Penalty function (PF method is also used to compare with our proposed method in terms of total cost and UC schedule.

  3. A hybrid approach based on EP and PSO for proficient solving of Unit Commitment Problem



    Full Text Available Unit Commitment Problem (UCP is a nonlinear mixed integer optimization problem used in the scheduling operation of power systemgenerating units subjected to demand and reserve requirement constraints for achieving minimum operating cost. The task of the UCproblem is to determine the on/off state of the generating units at every hour interval of the planning period for optimally transmitting the load and reserve among the committed units. The importance for the necessity of a more effective optimal solution to the UCP problem is increasing with the regularly varying demand. Hereby, we propose a hybrid approach which solves the unit commitment problem subjectedto necessary constraints and gives the optimal commitment of the units. The possible combination of demand and their correspondingoptimal generation schedule can be determined by the PSO algorithm. Being a global optimization technique, Evolutionary Programming(EP for solving Unit Commitment Problem, operates on a method, which encodes each unit’s operating schedule with respect to up/down time. When the demand over a time horizon is given as input to the network it successfully gives the schedule of each unit’s commitment that satisfies the demands of all the periods and results in minimum total cost. Because hybridization is dominating, this approach for solving the unit commitment problem is more effective.

  4. A Comparative Study of Three Different Mathematical Methods for Solving the Unit Commitment Problem

    Mehmet Kurban


    Full Text Available The unit commitment (UC problem which is an important subject in power system engineering is solved by using Lagragian relaxation (LR, penalty function (PF, and augmented Lagrangian penalty function (ALPF methods due to their higher solution quality and faster computational time than metaheuristic approaches. This problem is considered to be a nonlinear programming-(NP- hard problem because it is nonlinear, mixed-integer, and nonconvex. These three methods used for solving the problem are based on dual optimization techniques. ALPF method which combines the algorithmic aspects of both LR and PF methods is firstly used for solving the UC problem. These methods are compared to each other based on feasible schedule for each stage, feasible cost, dual cost, duality gap, duration time, and number of iterations. The numerical results show that the ALPF method gives the best duality gap, feasible and dual cost instead of worse duration time and the number of iterations. The four-unit Tuncbilek thermal plant which is located in Kutahya region in Turkey is chosen as a test system in this study. The programs used for all the analyses are coded and implemented using general algebraic modeling system (GAMS.

  5. A Block-Asynchronous Relaxation Method for Graphics Processing Units

    Antz, Hartwig [Karlsruhe Inst. of Technology (KIT) (Germany); Tomov, Stanimire [Univ. of Tennessee, Knoxville, TN (United States); Dongarra, Jack [Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Manchester (United Kingdom); Heuveline, Vincent [Karlsruhe Inst. of Technology (KIT) (Germany)


    In this paper, we analyze the potential of asynchronous relaxation methods on Graphics Processing Units (GPUs). For this purpose, we developed a set of asynchronous iteration algorithms in CUDA and compared them with a parallel implementation of synchronous relaxation methods on CPU-based systems. For a set of test matrices taken from the University of Florida Matrix Collection we monitor the convergence behavior, the average iteration time and the total time-to-solution time. Analyzing the results, we observe that even for our most basic asynchronous relaxation scheme, despite its lower convergence rate compared to the Gauss-Seidel relaxation (that we expected), the asynchronous iteration running on GPUs is still able to provide solution approximations of certain accuracy in considerably shorter time then Gauss- Seidel running on CPUs. Hence, it overcompensates for the slower convergence by exploiting the scalability and the good fit of the asynchronous schemes for the highly parallel GPU architectures. Further, enhancing the most basic asynchronous approach with hybrid schemes – using multiple iterations within the ”subdomain” handled by a GPU thread block and Jacobi-like asynchronous updates across the ”boundaries”, subject to tuning various parameters – we manage to not only recover the loss of global convergence but often accelerate convergence of up to two times (compared to the effective but difficult to parallelize Gauss-Seidel type of schemes), while keeping the execution time of a global iteration practically the same. This shows the high potential of the asynchronous methods not only as a stand alone numerical solver for linear systems of equations fulfilling certain convergence conditions but more importantly as a smoother in multigrid methods. Due to the explosion of parallelism in todays architecture designs, the significance and the need for asynchronous methods, as the ones described in this work, is expected to grow.

  6. Tight MIP formulations of the power-based unit commitment problem

    Morales-Espana, G.A.; Gentile, C.; Ramos, A.


    This paper provides the convex hull description for the basic operation of slow- and quick-start units in power-based unit commitment (UC) problems. The basic operating constraints that are modeled for both types of units are (1) generation limits and (2) minimum up and down times. Apart from this,

  7. Stochastic Electric Power Generation Unit Commitment in Deregulated Power Market Environment

    F. Gharehdaghi


    Full Text Available Utilities participating in deregulated markets observe increasing uncertainty in load (i.e., demand for electric power and prices for fuel and electricity on spot and contract markets. This study proposes a new formulation of the unit commitment problem of electric power generators in a restructured electricity market. Under these conditions, an electric power generation company will have the option to buy or sell from a power pool in addition to producing electricity on its own. The unit commitment problem is expressed as a stochastic optimization problem in which the objective is to maximize expected profits and the decisions are required to meet the standard operating constraints. Under the assumption of competitive market and price taking, it is depicted that the unit commitment schedule for a collection of N generation units can be solved by considering each unit separately. The volatility of the spot market price of electricity is represented by a stochastic model. This paper uses probabilistic dynamic programming to solve the stochastic optimization problem pertaining to unit commitment. It is shown that for a market of 150 units the proposed unit commitment can be accurately solved in a reasonable time by using the normal, Edgeworth, or Monte Carlo approximation methods.

  8. On units combination and commitment optimization for electric power production

    谭忠富; 何永秀


    Electric power system is one of the most important and complex engineering in modern society, supplying main and general power for social production and social life. Meanwhile, since it is a productive system with both high input and output, it has an obvious economic significance to improve its operating efficiency. For an example, an unit is 10 GW year. It will be discussed mainly that how to establish optimization model and its numerical algorithm for operating management of the electric power system. The idea on establishing optimization model is how to dispatch work state of units or power plants, so that total cost of fuel consumption for generation is reduced to the minimum. Here the dispatch is to decide which unit or plant to operate, which unit or plant to stop running, how much power should be generated for those operating units or plants at each given time interval.

  9. Fat Tail Model for Simulating Test Systems in Multiperiod Unit Commitment

    J. A. Marmolejo


    Full Text Available This paper describes the use of Chambers-Mallows-Stuck method for simulating stable random variables in the generation of test systems for economic analysis in power systems. A study that focused on generating test electrical systems through fat tail model for unit commitment problem in electrical power systems is presented. Usually, the instances of test systems in Unit Commitment are generated using normal distribution, but in this work, simulations data are based on a new method. For simulating, we used three original systems to obtain the demand behavior and thermal production costs. The estimation of stable parameters for the simulation of stable random variables was based on three generally accepted methods: (a regression, (b quantiles, and (c maximum likelihood, choosing one that has the best fit of the tails of the distribution. Numerical results illustrate the applicability of the proposed method by solving several unit commitment problems.

  10. A Convex Model of Risk-Based Unit Commitment for Day-Ahead Market Clearing Considering Wind Power Uncertainty

    Zhang, Ning; Kang, Chongqing; Xia, Qing


    The integration of wind power requires the power system to be sufficiently flexible to accommodate its forecast errors. In the market clearing process, the scheduling of flexibility relies on the manner in which the wind power uncertainty is addressed in the unit commitment (UC) model. This paper...... and are considered in both the objective functions and the constraints. The RUC model is shown to be convex and is transformed into a mixed integer linear programming (MILP) problem using relaxation and piecewise linearization. The proposed RUC model is tested using a three-bus system and an IEEE RTS79 system...... that the risk modeling facilitates a strategic market clearing procedure with a reasonable computational expense....

  11. Reviving the United States' Commitment to Pakistan and Afghanistan

    Dr. Steve Young


    Full Text Available As President Obama is in the midst of deciding whether additional U.S.combat forces are needed in Afghanistan in addition to the 21,000 troops recently committed, he must realize that additional armed forces are only a stopgap measure in Afghanistan's downward spiral into an 'undergoverned' failed state. Similarly, as Pakistan's fragile and fractured civilian government continues to appease the Tehrik-i-Taliban Pakistan (TTP, an umbrella organization of Pakistani Pashtun tribesmen with Taliban cultural values led by Baitullah Mehsud and others, it comes closer to the concept of a "misgoverned" failed state, possessing a small arsenal of nuclear arms. The problem for the U.S. administration is that neither of these countries can be allowed to fall further into disrepair. At the same time each requires a different and unique approach to the threat of "Talibanization" that faces each country—the control of territory within each country by Islamic radicals seeking to impose their ultraconservative interpretation of shar'ia law onto the general populace. Generally acknowledged is the belief that what has tentatively worked in Iraq, that is, the additional U.S. troops and employment of former Sunni insurgents to help fight foreign fighters associated with al-Qaida, will not work in either Afghanistan or Pakistan. While a regional approach to the conflict in these two countries is warranted, Afghanistan and Pakistan are on two different economic, social, and political playing fields. Hence, there cannot be a one-size-fits-all solution for the two countries, especially one that draws on the Iraq playbook. In addition to its internal political problems, Pakistan also faces the issue of al-Qaida and Taliban training camps positioned in its literal back yard, the Federally Administered Tribal Areas (FATA or Tribal Areas. Resolution of the War on Terror cannot come to fruition without addressing the problems that exist in the Tribal Areas. This largely

  12. Advanced Unit Commitment Strategies for the U.S. Eastern Interconnection: Preprint

    Ela, E.; Milligan, M.; Meibom, P.; Barth, R.; Tuohy, A.


    This paper outlines a study undertaken for the U.S. Eastern Interconnection in which different advanced unit commitment strategies were simulated for three different years to evaluate the benefits that may occur from using these strategies as an operational tool.

  13. Advanced Unit Commitment Strategies for the U.S. Eastern Interconnection: Preprint

    Ela, E.; Milligan, M.; Meibom, P.; Barth, R.; Tuohy, A.


    This paper outlines a study undertaken for the U.S. Eastern Interconnection in which different advanced unit commitment strategies were simulated for three different years to evaluate the benefits that may occur from using these strategies as an operational tool.

  14. Network-constrained AC unit commitment under uncertainty: A Benders' decomposition approach

    Nasri, Amin; Kazempour, Seyyedjalal; Conejo, Antonio J.


    This paper proposes an efficient solution approach based on Benders’ decomposition to solve a network-constrained ac unit commitment problem under uncertainty. The wind power production is the only source of uncertainty considered in this paper, which is modeled through a suitable set of scenario...

  15. Emerging solution of large-scale unit commitment problem by Stochastic Priority List

    Senjyu, Tomonobu; Miyagi, Tsukasa; Saber, Ahmed Yousuf; Urasaki, Naomitsu [Faculty of Engineering, University of the Ryukyus, 1 Senbaru Nishihara-cho Nakagami, Okinawa 903-0213 (Japan); Funabashi, Toshihisa [Meidensha Corporation Riverside Building 36-2, Nihonbashi Hokozakicho, Chuo-ku, Tokyo 103-8515 (Japan)


    This paper presents a new approach for unit commitment problem using Stochastic Priority List method. In this method, rapidly some initial unit commitment schedules are generated by Priority List method and priority based stochastic window system. Excess units are added with system dependent probability distribution to avoid overlooking a desired solution during repeated search. Constraints are not considered in this stage. Then schedules are modified gradually using the problem specific heuristics to fulfill constraints. To reduce calculations, heuristics are applied only to the solutions, which can be expected to improve. Besides, sign vector is introduced to reduce economic load dispatch (ELD) overhead recalculations. This process is repeated for optimal solution. The proposed method is tested using the reported problem data set. Simulation results for the systems up to 100-unit are compared to previous reported results. Numerical results show an improvement in solution cost and time compared to the results obtained from Genetic Algorithm and others. (author)

  16. Efficacy and Cost-effectiveness of Acceptance and Commitment Therapy and Applied Relaxation for Longstanding Pain: A Randomized Controlled Trial.

    Kemani, Mike K; Olsson, Gunnar L; Lekander, Mats; Hesser, Hugo; Andersson, Erik; Wicksell, Rikard K


    To date, few studies have compared Acceptance and Commitment Therapy (ACT) for longstanding pain with established treatments. Only 1 study has evaluated the cost-effectiveness of ACT. The aim of the current study was to evaluate the efficacy and cost-effectiveness of ACT and applied relaxation (AR) for adults with unspecific, longstanding pain. On the basis of the inclusion criteria 60 consecutive patients received 12 weekly group sessions of ACT or AR. Data were collected pretreatment, midtreatment, and posttreatment, as well as at 3- and 6-month follow-up. Growth curve modeling was used to analyze treatment effects on pain disability, pain intensity, health-related quality of life (physical domain), anxiety, depression, and acceptance. Significant improvements were seen across conditions (pretreatment to follow-up assessment) on all outcome measures. Pain disability decreased significantly in ACT relative to AR from preassessment to postassessment. A corresponding decrease in pain disability was seen in AR between postassessment and 6-month follow-up. Pain acceptance increased only in ACT, and this effect was maintained at 6-month follow-up. Approximately 20% of the participants achieved clinically significant change after treatment. Health economic analyses showed that ACT was more cost-effective than AR at post and 3-month follow-up assessment, but not at 6-month follow-up. More studies investigating moderators and mediators of change are needed. The present study is one of few that have evaluated the cost-effectiveness of ACT and AR and compared ACT with an established behavioral intervention, and the results provide additional support for behavioral interventions for longstanding pain.

  17. A randomized clinical trial of Acceptance and Commitment Therapy vs. Progressive Relaxation Training for obsessive compulsive disorder

    Twohig, Michael P.; Hayes, Steven C.; Plumb, Jennifer C.; Pruitt, Larry D.; Collins, Angela B.; Hazlett-Stevens, Holly; Woidneck, Michelle R.


    Objective Effective treatments for adult OCD exist, but refusal and drop-out rates are high and treatments are not effective for all individuals who complete them. Thus, additional treatment options are needed. This study investigated the effectiveness of eight sessions of Acceptance and Commitment Therapy (ACT) for adult obsessive compulsive disorder (OCD) compared to Progressive Relaxation Training (PRT). Method 79 adults (66% Female) diagnosed with OCD (M age=37, 89% Caucasian) participated in a randomized clinical trial of 8 sessions of ACT or PRT with no in-session exposure. The following assessments were completed at pretreatment, posttreatment, and three month follow-up by an assessor who was unaware of treatment conditions: Yale-Brown Obsessive Compulsive Scale (Y-BOCS), Beck Depression Inventory-II, Quality of Life Scale, Acceptance and Action Questionnaire, Thought Action Fusion Scale, and Thought Control Questionnaire. The Treatment Evaluation Inventory-Short Form was completed at posttreatment. Results ACT produced greater changes at posttreatment and follow-up over PRT on OCD severity (Y-BOCS: ACT pre=24.22, post=12.76, follow-up=11.79; PRT pre=25.4, post=18.67, follow-up=16.23), and produced greater change on depression among those reporting at least mild depression before treatment. Clinically significant change in OCD severity occurred more in the ACT condition than PRT using multiple criteria (clinical response rates: ACT post=46-56%, follow-up 46-66%; PRT post=13%-18%, follow-up 16-18%). Quality of life improved in both conditions but was marginally in favor of ACT at post. Finally, treatment refusal (2.4% ACT, 7.8% PRT) and drop-out (9.8% ACT, 13.2% PRT) were low in both conditions. Conclusions ACT is worth exploring further as a treatment for OCD. PMID:20873905

  18. Genetic Algorithm Based Simulated Annealing Method for Solving Unit Commitment Problem in Utility System

    Rajan, C. Christober Asir


    The objective of this paper is to find the generation scheduling such that the total operating cost can be minimized, when subjected to a variety of constraints. This also means that it is desirable to find the optimal generating unit commitment in the power system for the next H hours. Genetic Algorithms (GA's) are general-purpose optimization techniques based on principles inspired from the biological evolution using metaphors of mechanisms such as neural section, genetic recombination and survival of the fittest. In this, the unit commitment schedule is coded as a string of symbols. An initial population of parent solutions is generated at random. Here, each schedule is formed by committing all the units according to their initial status ("flat start"). Here the parents are obtained from a pre-defined set of solution's i.e. each and every solution is adjusted to meet the requirements. Then, a random recommitment is carried out with respect to the unit's minimum down times. And SA improves the status. A 66-bus utility power system with twelve generating units in India demonstrates the effectiveness of the proposed approach. Numerical results are shown comparing the cost solutions and computation time obtained by using the Genetic Algorithm method and other conventional methods.

  19. Monte Carlo based unit commitment procedures for the deregulated market environment

    Granelli, G.P.; Marannino, P.; Montagna, M.; Zanellini, F. [Universita di Pavia, Pavia (Italy). Dipartimento di Ingegneria Elettrica


    The unit commitment problem, originally conceived in the framework of short term operation of vertically integrated utilities, needs a thorough re-examination in the light of the ongoing transition towards the open electricity market environment. In this work the problem is re-formulated to adapt unit commitment to the viewpoint of a generation company (GENCO) which is no longer bound to satisfy its load, but is willing to maximize its profits. Moreover, with reference to the present day situation in many countries, the presence of a GENCO (the former monopolist) which is in the position of exerting the market power, requires a careful analysis to be carried out considering the different perspectives of a price taker and of the price maker GENCO. Unit commitment is thus shown to lead to a couple of distinct, yet slightly different problems. The unavoidable uncertainties in load profile and price behaviour over the time period of interest are also taken into account by means of a Monte Carlo simulation. Both the forecasted loads and prices are handled as random variables with a normal multivariate distribution. The correlation between the random input variables corresponding to successive hours of the day was considered by carrying out a statistical analysis of actual load and price data. The whole procedure was tested making use of reasonable approximations of the actual data of the thermal generation units available to come actual GENCOs operating in Italy. (author)

  20. Unit commitment with wind power generation: integrating wind forecast uncertainty and stochastic programming.

    Constantinescu, E. M.; Zavala, V. M.; Rocklin, M.; Lee, S.; Anitescu, M. (Mathematics and Computer Science); (Univ. of Chicago); (New York Univ.)


    We present a computational framework for integrating the state-of-the-art Weather Research and Forecasting (WRF) model in stochastic unit commitment/energy dispatch formulations that account for wind power uncertainty. We first enhance the WRF model with adjoint sensitivity analysis capabilities and a sampling technique implemented in a distributed-memory parallel computing architecture. We use these capabilities through an ensemble approach to model the uncertainty of the forecast errors. The wind power realizations are exploited through a closed-loop stochastic unit commitment/energy dispatch formulation. We discuss computational issues arising in the implementation of the framework. In addition, we validate the framework using real wind speed data obtained from a set of meteorological stations. We also build a simulated power system to demonstrate the developments.

  1. A Unit Commitment Model with Demand Response for the Integration of Renewable Energies

    IKEDA Yuichi; Ikegami, Takashi; Kataoka, Kazuto; Ogimoto, Kazuhiko


    The output of renewable energy fluctuates significantly depending on weather conditions. We develop a unit commitment model to analyze requirements of the forecast output and its error for renewable energies. Our model obtains the time series for the operational state of thermal power plants that would maximize the profits of an electric power utility by taking into account both the forecast of output its error for renewable energies and the demand response of consumers. We consider a power s...

  2. An improved two stages dynamic programming/artificial neural network solution model to the unit commitment of thermal units

    Abbasy, N.H. [College of Technological Studies, Shuwaikh (Kuwait); Elfayoumy, M.K. [Univ. of Alexandria (Egypt). Dept. of Electrical Engineering


    An improved two stages solution model to the unit commitment of thermal units is developed in this paper. In the first stage a pre-schedule is generated using a high quality trained artificial neural net (ANN). A dynamic programming (DP) algorithm is implemented and applied in the second stage for the final determination of the commitment states. The developed solution model avoids the complications imposed by the generation of the variable window structure, proposed by other techniques. A unified approach for the treatment of the ANN is also developed in the paper. The validity of the proposed technique is proved via numerical applications to both sample and small practical power systems. 12 refs, 9 tabs

  3. Column Generation for Transmission Switching of Electricity Networks with Unit Commitment

    Villumsen, Jonas Christoffer; Philpott, Andy B.


    This paper presents the problem of finding the minimum cost dispatch and commitment of power generation units in a transmission network with active switching.We use the term active switching to denote the use of switches to optimize network topology in an operational context. We propose a Dantzig......-Wolfe reformulation and a novel column generation framework to solve the problem efficiently. Preliminary results are presented for the IEEE-118 bus network with 19 generator units. Active switching is shown to reduce total cost by up to 15 % for a particular 24-hour period. Furthermore, the need for generator...




    Full Text Available This paper presents a new approach to solve the profit based multi area unit commitment problem (PBMAUCP using an evolutionary programming based particle swarm optimization (EPPSO method. The objective of this paper is to maximize the profit of generation companies (GENCOs with considering system social benefit. The proposed method helps GENCOs to make a decision, how much power and reserve should be sold in markets, and how to schedule generators in order to receive the maximum profit. Joint operation of generation resources can result in significant operational cost savings. Power transfer between the areas through the tie lines depends upon the operating cost of generation at each hour and tie line transfer limits. The tie line transfer limits were considered as a set of constraints during optimization process to ensure the system security and reliability. The overall algorithm can be implemented on an IBM PC, which can process a fairly large system in a reasonable period of time. Case study of four areas with different load pattern each containing 7 units (NTPS and 26 units connected via tie lines have been taken for analysis. Numerical results showed comparing the profit of evolutionary programming-based particle swarm optimization method (EPPSO with conventional dynamic programming (DP, evolutionary programming (EP, and particle swarm optimization (PSO method. Experimental results shows that the application of this evolutionary programming based particle swarm optimization method have the potential to solve profit based multi area unit commitment problem with lesser computation time.

  5. Stochastic Unit Commitment via Progressive Hedging - Extensive Analysis of Solution Methods

    Ordoudis, Christos; Pinson, Pierre; Zugno, Marco


    high computational power, as stochastic models are dramatically more complex than their deterministic counterparts. This paper provides new insight into the potential of Progressive Hedging to decrease the solution time of the stochastic unit commitment problem with a relatively small trade......-off in terms of the suboptimality of the solution. Computational studies show that the run-time is at most half of what is needed to solve the original extensive formulation of the problem, when more than ten wind power scenarios are utilized. These studies demonstrate great potential for solving real...

  6. Research on unit commitment with large-scale wind power connected power system

    Jiao, Ran; Zhang, Baoqun; Chi, Zhongjun; Gong, Cheng; Ma, Longfei; Yang, Bing


    Large-scale integration of wind power generators into power grid brings severe challenges to power system economic dispatch due to its stochastic volatility. Unit commitment including wind farm is analyzed from the two parts of modeling and solving methods. The structures and characteristics can be summarized after classification has been done according to different objective function and constraints. Finally, the issues to be solved and possible directions of research and development in the future are discussed, which can adapt to the requirements of the electricity market, energy-saving power generation dispatching and smart grid, even providing reference for research and practice of researchers and workers in this field.

  7. Thermal Unit Commitment Scheduling Problem in Utility System by Tabu Search Embedded Genetic Algorithm Method

    C. Christober Asir Rajan


    Full Text Available The objective of this paper is to find the generation scheduling such that the total operating cost can be minimized, when subjected to a variety of constraints. This also means that it is desirable to find the optimal unit commitment in the power system for the next H hours. A 66-bus utility power system in India demonstrates the effectiveness of the proposed approach; extensive studies have also been performed for different IEEE test systems consist of 24, 57 and 175 buses. Numerical results are shown comparing the cost solutions and computation time obtained by different intelligence and conventional methods.

  8. A new approach for GenCos profit based unit commitment in day-ahead competitive electricity markets considering reserve uncertainty

    Yamin, H.Y. [Department of Power Engineering, Hijjawi Faculty, Yarmouk University, Irbid 21163 (Jordan); El-Dwairi, Q. [Department of Anatomy, Jordan University of Science and Technology, Irbid (Jordan); Shahidehpour, S.M. [Department of Electrical and Computer Engineering, Illinois Institute of Technology (United States)


    This paper presents a new approach for GenCos Profit Based Unit Commitment (GPBUC) in day-ahead competitive electricity markets. Generation, spinning and non-spinning reserves are considered in the proposed formulation. The estimated probability that spinning and non-spinning reserves are called and generated is also considered in the formulation to simulate the reserve uncertainty. The artificial neural network (ANN) is applied for forecasting the reserve probability considering line limits, line and generator outages, market prices, bidding strategy, load and reserves patterns. Fuel and emission constraints are included in the model. A hybrid method between Lagrangian relaxation (LR) and evolutionary programming (EP) is applied to solve the proposed GPBUC problem. The proposed approach is applied to a 36 unit test system and the results are compared with those obtained from other approaches. (author)

  9. Scalable unit commitment by memory-bounded ant colony optimization with A{sup *} local search

    Saber, Ahmed Yousuf; Alshareef, Abdulaziz Mohammed [Department of Electrical and Computer Engineering, King Abdulaziz University, P.O. Box 80204, Jeddah 21589 (Saudi Arabia)


    Ant colony optimization (ACO) is successfully applied in optimization problems. Performance of the basic ACO for small problems with moderate dimension and searching space is satisfactory. As the searching space grows exponentially in the large-scale unit commitment problem, the basic ACO is not applicable for the vast size of pheromone matrix of ACO in practical time and physical computer-memory limit. However, memory-bounded methods prune the least-promising nodes to fit the system in computer memory. Therefore, the authors propose memory-bounded ant colony optimization (MACO) in this paper for the scalable (no restriction for system size) unit commitment problem. This MACO intelligently solves the limitation of computer memory, and does not permit the system to grow beyond a bound on memory. In the memory-bounded ACO implementation, A{sup *} heuristic is introduced to increase local searching ability and probabilistic nearest neighbor method is applied to estimate pheromone intensity for the forgotten value. Finally, the benchmark data sets and existing methods are used to show the effectiveness of the proposed method. (author)

  10. Incorporating Wind Power Forecast Uncertainties Into Stochastic Unit Commitment Using Neural Network-Based Prediction Intervals.

    Quan, Hao; Srinivasan, Dipti; Khosravi, Abbas


    Penetration of renewable energy resources, such as wind and solar power, into power systems significantly increases the uncertainties on system operation, stability, and reliability in smart grids. In this paper, the nonparametric neural network-based prediction intervals (PIs) are implemented for forecast uncertainty quantification. Instead of a single level PI, wind power forecast uncertainties are represented in a list of PIs. These PIs are then decomposed into quantiles of wind power. A new scenario generation method is proposed to handle wind power forecast uncertainties. For each hour, an empirical cumulative distribution function (ECDF) is fitted to these quantile points. The Monte Carlo simulation method is used to generate scenarios from the ECDF. Then the wind power scenarios are incorporated into a stochastic security-constrained unit commitment (SCUC) model. The heuristic genetic algorithm is utilized to solve the stochastic SCUC problem. Five deterministic and four stochastic case studies incorporated with interval forecasts of wind power are implemented. The results of these cases are presented and discussed together. Generation costs, and the scheduled and real-time economic dispatch reserves of different unit commitment strategies are compared. The experimental results show that the stochastic model is more robust than deterministic ones and, thus, decreases the risk in system operations of smart grids.

  11. Commitment and dispatch of heat and power units via affinely adjustable robust optimization

    Zugno, Marco; Morales González, Juan Miguel; Madsen, Henrik


    The joint management of heat and power systems is believed to be key to the integration of renewables into energy systems with a large penetration of district heating. Determining the day-ahead unit commitment and production schedules for these systems is an optimization problem subject...... to uncertainty stemming from the unpredictability of demand and prices for heat and electricity. Furthermore, owing to the dynamic features of production and heat storage units as well as to the length and granularity of the optimization horizon (e.g., one whole day with hourly resolution), this problem...... approach. Secondly, we appraise the gain obtained by switching from linear to piecewise-linear decision rules within robust optimization. Furthermore, we give directions for selecting the parameters defining the uncertainty set (size, budget) and assess the resulting trade-off between average profit...

  12. Metamodel-assisted evolutionary algorithms for the unit commitment problem with probabilistic outages

    Georgopoulou, Chariklia A.; Giannakoglou, Kyriakos C. [National Technical University of Athens, School of Mechanical Engineering, Lab. of Thermal Turbomachines, Parallel CFD and Optimization Unit, P.O. Box 64069, Athens 157 10 (Greece)


    An efficient method for solving power generating unit commitment (UC) problems with probabilistic unit outages is proposed. It is based on a two-level evolutionary algorithm (EA) minimizing the expected total operating cost (TOC) of a system of power generating units over a scheduling period, with known failure and repair rates of each unit. To compute the cost function value of each EA population member, namely a candidate UC schedule, a Monte Carlo simulation must be carried out. Some thousands of replicates are generated according to the units' outage and repair rates and the corresponding probabilities. Each replicate is represented by a series of randomly generated availability and unavailability periods of time for each unit and the UC schedule under consideration accordingly. The expected TOC is the average of the TOCs of all Monte Carlo replicates. Therefore, the CPU cost per Monte Carlo evaluation increases noticeably and so does the CPU cost of running the EA. To reduce it, the use of a metamodel-assisted EA (MAEA) with on-line trained surrogate evaluation models or metamodels (namely, radial-basis function networks) is proposed. A novelty of this method is that the metamodels are trained on a few ''representative'' unit outage scenarios selected among the Monte Carlo replicates generated once during the optimization and, then, used to predict the expected TOC. Based on this low cost, approximate pre-evaluation, only a few top individuals within each generation undergo Monte Carlo simulations. The proposed MAEA is demonstrated on test problems and shown to drastically reduce the CPU cost, compared to EAs which are exclusively based on Monte Carlo simulations. (author)

  13. A Three-Stage Birandom Program for Unit Commitment with Wind Power Uncertainty

    Zhang, Na; Li, Weidong; Liu, Rao; Lv, Quan; Sun, Liang


    The integration of large-scale wind power adds a significant uncertainty to power system planning and operating. The wind forecast error is decreased with the forecast horizon, particularly when it is from one day to several hours ahead. Integrating intraday unit commitment (UC) adjustment process based on updated ultra-short term wind forecast information is one way to improve the dispatching results. A novel three-stage UC decision method, in which the day-ahead UC decisions are determined in the first stage, the intraday UC adjustment decisions of subfast start units are determined in the second stage, and the UC decisions of fast-start units and dispatching decisions are determined in the third stage is presented. Accordingly, a three-stage birandom UC model is presented, in which the intraday hours-ahead forecasted wind power is formulated as a birandom variable, and the intraday UC adjustment event is formulated as a birandom event. The equilibrium chance constraint is employed to ensure the reliability requirement. A birandom simulation based hybrid genetic algorithm is designed to solve the proposed model. Some computational results indicate that the proposed model provides UC decisions with lower expected total costs. PMID:24987739

  14. Smart Grid Cost-Emission Unit Commitment via Co-Evolutionary Agents

    Xiaohua Zhang


    Full Text Available In this paper, the uncertainty of wind, solar and load; smart charging and discharging of plug-in hybrid electric vehicles (PHEVs to and from various energy sources; and the coordination of wind, solar power, PHEVs and cost-emission are considered in the smart grid unit commitment (UC. First, a multi-scenario simulation is used in which a set of valid scenarios is considered for the uncertainties of wind and solar energy sources and load. Then the UC problem for the set of scenarios is decomposed into the optimization of interactive agents by multi-agent technology. Agents’ action is represented by a genetic algorithm with adaptive crossover and mutation operators. The adaptive co-evolution of agents is reached by adaptive cooperative multipliers. Finally, simulation is implemented on an example of a power system containing thermal units, a wind farm, solar power plants and PHEVs. The results show the effectiveness of the proposed method. Thermal units, wind, solar power and PHEVs are mutually complementarily by the adaptive cooperative mechanism. The adaptive multipliers’ updating strategy can save more computational time and further improve the efficiency.

  15. An immune-tabu hybrid algorithm for thermal unit commitment of electric power systems

    Wei LI; Hao-yu PENG; Wei-hang ZHU; De-ren SHENG; Jian-hong CHEN


    This paper presents a new method based on an immune-tabu hybrid algorithm to solve the thermal unit commitment (TUC) problem in power plant optimization. The mathematical model of the TUC problem is established by analyzing the generating units in modern power plants. A novel immune-tabu hybrid algorithm is proposed to solve this complex problem. In the algorithm, the objective function of the TUC problem is considered as an antigen and the solutions are considered as antibodies,which are determined by the affinity computation. The code length of an antibody is shortened by encoding the continuous operating time, and the optimum searching speed is improved. Each feasible individual in the immune algorithm (IA) is used as the initial solution of the tabu search (TS) algorithm after certain generations of IA iteration. As examples, the proposed method has been applied to several thermal unit systems for a period of 24 h. The computation results demonstrate the good global optimum searching performance of the proposed immune-tabu hybrid algorithm. The presented algorithm can also be used to solve other optimization problems in fields such as the chemical industry and the power industry.

  16. A fuzzy chance-constrained program for unit commitment problem considering demand response, electric vehicle and wind power

    Zhang, Ning; Hu, Zhaoguang; Han, Xue


    commitment model is proposed in this paper considering demand response and electric vehicles, which can promote the exploitation of wind power. On the one hand, demand response and electric vehicles have the feasi- bility to change the load demand curve to solve the mismatch problem. On the other hand......, they can serve as reserve for wind power. To deal with the unit commitment problem, authors use a fuzzy chance- constrained program that takes into account the wind power forecasting errors. The numerical study shows that the model can promote the utilization of wind power evidently, making the power...

  17. Two-level, two-objective evolutionary algorithms for solving unit commitment problems

    Georgopoulou, Chariklia A.; Giannakoglou, Kyriakos C. [National Technical University of Athens, School of Mechanical Engineering, Laboratory of Thermal Turbomachines, Parallel CFD and Optimization Unit, P.O. Box 64069, Athens 157 10 (Greece)


    A two-level, two-objective optimization scheme based on evolutionary algorithms (EAs) is proposed for solving power generating Unit Commitment (UC) problems by considering stochastic power demand variations. Apart from the total operating cost to cover a known power demand distribution over the scheduling horizon, which is the first objective, the risk of not fulfilling possible demand variations forms the second objective to be minimized. For this kind of problems with a high number of decision variables, conventional EAs become inefficient optimization tools, since they require a high number of evaluations before reaching the optimal solution(s). To considerably reduce the computational burden, a two-level algorithm is proposed. At the low level, a coarsened UC problem is defined and solved using EAs to locate promising solutions at low cost: a strategy for coarsening the UC problem is proposed. Promising solutions migrate upwards to be injected into the high level EA population for further refinement. In addition, at the high level, the scheduling horizon is partitioned in a small number of subperiods of time which are optimized iteratively using EAs, based on objective function(s) penalized to ensure smooth transition from/to the adjacent subperiods. Handling shorter chromosomes due to partitioning increases method's efficiency despite the need for iterating. The proposed two-level method and conventional EAs are compared on representative test problems. (author)

  18. A modified priority list-based MILP method for solving large-scale unit commitment problems

    Ke, Xinda; Lu, Ning; Wu, Di; Kintner-Meyer, Michael CW


    This paper studies the typical pattern of unit commitment (UC) results in terms of generator’s cost and capacity. A method is then proposed to combine a modified priority list technique with mixed integer linear programming (MILP) for UC problem. The proposed method consists of two steps. At the first step, a portion of generators are predetermined to be online or offline within a look-ahead period (e.g., a week), based on the demand curve and generator priority order. For the generators whose on/off status is predetermined, at the second step, the corresponding binary variables are removed from the UC MILP problem over the operational planning horizon (e.g., 24 hours). With a number of binary variables removed, the resulted problem can be solved much faster using the off-the-shelf MILP solvers, based on the branch-and-bound algorithm. In the modified priority list method, scale factors are designed to adjust the tradeoff between solution speed and level of optimality. It is found that the proposed method can significantly speed up the UC problem with minor compromise in optimality by selecting appropriate scale factors.

  19. A comparative study of 2 manual-based self-help interventions, acceptance and commitment therapy and applied relaxation, for persons with chronic pain.

    Thorsell, Jenny; Finnes, Anna; Dahl, Joanne; Lundgren, Tobias; Gybrant, Maria; Gordh, Torsten; Buhrman, Monica


    The aim of this study was to compare 2 self-help-based interventions; a coping-oriented approach, applied relaxation (AR) and an acceptance-oriented approach, acceptance and commitment therapy (ACT), for persons with chronic pain. This study is a randomized control trial (N=90) with a mixed between-within participants design with repeated measures. Interventions in both conditions comprised an initial face-to-face session, a 7-week manual-based self-help intervention including weekly therapist telephone support and a concluding face-to-face session. Outcome measures included satisfaction with life, depression, anxiety, acceptance of chronic pain, level of function, and pain intensity. Effects were measured at preintervention and postintervention and at 6 and 12 months after the end of intervention. The results show that the ACT condition increased their level of acceptance significantly compared with the AR condition. There was also a marginally significant interaction effect regarding satisfaction with life in which the ACT condition had improved in comparison to the AR condition. Further, the ACT condition reported a higher level of function and decreased pain intensity compared with the AR condition. Both conditions improved significantly regarding depression and anxiety. A manual-based self-help intervention with weekly therapist support in an ACT format adds value to the treatment repertoire for persons suffering with chronic pain.

  20. Day-Ahead Coordination of Vehicle-to-Grid Operation and Wind Power in Security Constraints Unit Commitment (SCUC

    Mohammad Javad Abdollahi


    Full Text Available In this paper security constraints unit commitment (SCUC in the presence of wind power resources and electrical vehicles to grid is presented. SCUC operation prepare an optimal time table for generation unit commitment in order to maximize security, minimize operation cost and satisfy the constraints of networks and units in a period of time, as one of the most important research interest in power systems. Today, the relationship between power network and energy storage systems is interested for many researchers and network operators. Using Electrical Vehicles (PEVs and wind power for energy production is one of the newest proposed methods for replacing fossil fuels.One of the effective strategies for analyzing of the effects of Vehicle 2 Grid (V2G and wind power in optimal operation of generation is running of SCUC for power systems that are equipped with V2G and wind power resources. In this paper, game theory method is employed for deterministic solution of day-ahead unit commitment with considering security constraints in the simultaneous presence of V2G and wind power units. This problem for two scenarios of grid-controlled mode and consumer-controlled mode in three different days with light, medium and heavy load profiles is analyzed. Simulation results show the effectiveness of the presence of V2G and wind power for decreasing of generation cost and improving operation indices of power systems.

  1. Global reorganisation of cis-regulatory units upon lineage commitment of human embryonic stem cells.

    Freire-Pritchett, Paula; Schoenfelder, Stefan; Várnai, Csilla; Wingett, Steven W; Cairns, Jonathan; Collier, Amanda J; García-Vílchez, Raquel; Furlan-Magaril, Mayra; Osborne, Cameron S; Fraser, Peter; Rugg-Gunn, Peter J; Spivakov, Mikhail


    Long-range cis-regulatory elements such as enhancers coordinate cell-specific transcriptional programmes by engaging in DNA looping interactions with target promoters. Deciphering the interplay between the promoter connectivity and activity of cis-regulatory elements during lineage commitment is crucial for understanding developmental transcriptional control. Here, we use Promoter Capture Hi-C to generate a high-resolution atlas of chromosomal interactions involving ~22,000 gene promoters in human pluripotent and lineage-committed cells, identifying putative target genes for known and predicted enhancer elements. We reveal extensive dynamics of cis-regulatory contacts upon lineage commitment, including the acquisition and loss of promoter interactions. This spatial rewiring occurs preferentially with predicted changes in the activity of cis-regulatory elements and is associated with changes in target gene expression. Our results provide a global and integrated view of promoter interactome dynamics during lineage commitment of human pluripotent cells.

  2. Correlated and cooperative motions in segmental relaxation: Influence of constitutive unit weight and intermolecular interactions

    Rijal, Bidur; Soto Puente, Jorge Arturo; Atawa, Bienvenu; Delbreilh, Laurent; Fatyeyeva, Kateryna; Saiter, Allisson; Dargent, Eric


    This work clarifies the notion of correlated and cooperative motions appearing during the α-relaxation process through the role of the molecular weight of the constitutive units and of the interchain dipolar interactions. By studying amorphous copolymers of poly(ethylene-co-vinyl acetate) with different vinyl acetate contents, we show that the correlated motions are not sensitive to the interchain dipolar interactions, in contrast to the cooperative motions, which increase with a strengthening of the intermolecular interactions for this sample family. Concerning the influence of the molecular weight m0, the notion of "correlated motions" seems to be equivalent to the notion of "cooperative motions" only for low m0 systems.

  3. Two-Stage Robust Security-Constrained Unit Commitment with Optimizable Interval of Uncertain Wind Power Output

    Dayan Sun


    Full Text Available Because wind power spillage is barely considered, the existing robust unit commitment cannot accurately analyze the impacts of wind power accommodation on on/off schedules and spinning reserve requirements of conventional generators and cannot consider the network security limits. In this regard, a novel double-level robust security-constrained unit commitment formulation with optimizable interval of uncertain wind power output is firstly proposed in this paper to obtain allowable interval solutions for wind power generation and provide the optimal schedules for conventional generators to cope with the uncertainty in wind power generation. The proposed double-level model is difficult to be solved because of the invalid dual transform in solution process caused by the coupling relation between the discrete and continuous variables. Therefore, a two-stage iterative solution method based on Benders Decomposition is also presented. The proposed double-level model is transformed into a single-level and two-stage robust interval unit commitment model by eliminating the coupling relation, and then this two-stage model can be solved by Benders Decomposition iteratively. Simulation studies on a modified IEEE 26-generator reliability test system connected to a wind farm are conducted to verify the effectiveness and advantages of the proposed model and solution method.

  4. New algorithm for the unit commitment based on the system marginal price%基于边际电价的短期机组组合求解新方法

    江健健; 夏清; 沈瑜; 康重庆; 许洪强; 张元鹏


    在制定电力市场中的电力交易计划时,由于系统边际电价(SMP)的引入,机组组合问题呈现出非解析的特点。论文建立了基于系统边际电价机组组合问题的数学模型,并结合电力市场的新特点,在分析Lagrangian分解与协调算法机理的基础上,提出了一种求解基于系统边际电价的机组组合问题的新方法。与传统Lagrangian方法相比,新算法很好地解决了传统方法求解基于SMP的机组组合问题时遇到的“振荡”以及“调整死区”等问题。实际应用表明:新算法具有很好的快速收敛性以及优化效果。%he concept of system marginal price (SMP) is introduced intopower generation planning. The objective function of the unit commitment is non-analytic. This paper presents the mathematical model of the unit commitment based on SMP with a new method for solving the unit commitment by analyzing the mechanism of the Lagrangian relaxation method and its coordinating process. The method overcomes the “calculated oscillation” and “dead-zone regulation” problems arising from the analysis of the unit commitment in a deregulated environment by traditional methods. The quick convergence and excellent optimizing ability of the new method are demonstrated by a practical application.

  5. A Comparative Study of Fuzzy Logic, Genetic Algorithm, and Gradient-Genetic Algorithm Optimization Methods for Solving the Unit Commitment Problem


    Due to the continuous increase of the population and the perpetual progress of industry, the energy management presents nowadays a relevant topic that concerns researchers in electrical engineering. Indeed, in order to establish a good exploitation of the electrical grid, it is necessary to solve technical and economic problems. This can only be done through the resolution of the Unit Commitment Problem. Unit Commitment Problem allows optimizing the combination of the production units’ states...

  6. A Multi-Objective Unit Commitment Model for Setting Carbon Tax to Reduce CO2 Emission: Thailand's Electricity Generation Case

    Nuchjarin Intalar


    Full Text Available Carbon tax policy is a cost-effective instrument for emission reduction. However, setting the carbon tax is one of the challenging task for policy makers as it will lead to higher price of emission-intensive sources especially the utility price. In a large-scale power generation system, minimizing the operational cost and the environmental impact are conflicting objectives and it is difficult to find the compromise solution. This paper proposes a methodology of finding a feasible carbon tax rate on strategic level using the operational unit commitment model. We present a multi-objective mixed integer linear programming model to solve the unit commitment problem and consider the environmental impacts. The methodology of analyzing of the effect of carbon tax rates on the power generation, operating cost, and CO2 emission is also provided. The trade-off relationship between total operating cost and total CO2 emission is presented in the Pareto-optimal curve to analyze the feasible carbon tax rate that is influencing on electricity operating cost. The significant outcome of this paper is a modeling framework for the policy makers to determine the possible carbon tax that can be imposed on the electricity generation.

  7. Short-term bulk energy storage system scheduling for load leveling in unit commitment: modeling, optimization, and sensitivity analysis.

    Hemmati, Reza; Saboori, Hedayat


    Energy storage systems (ESSs) have experienced a very rapid growth in recent years and are expected to be a promising tool in order to improving power system reliability and being economically efficient. The ESSs possess many potential benefits in various areas in the electric power systems. One of the main benefits of an ESS, especially a bulk unit, relies on smoothing the load pattern by decreasing on-peak and increasing off-peak loads, known as load leveling. These devices require new methods and tools in order to model and optimize their effects in the power system studies. In this respect, this paper will model bulk ESSs based on the several technical characteristics, introduce the proposed model in the thermal unit commitment (UC) problem, and analyze it with respect to the various sensitive parameters. The technical limitations of the thermal units and transmission network constraints are also considered in the model. The proposed model is a Mixed Integer Linear Programming (MILP) which can be easily solved by strong commercial solvers (for instance CPLEX) and it is appropriate to be used in the practical large scale networks. The results of implementing the proposed model on a test system reveal that proper load leveling through optimum storage scheduling leads to considerable operation cost reduction with respect to the storage system characteristics.

  8. Hypertension self-control with a portable feedback unit or meditation-relaxation.

    Hager, J L; Surwit, R S


    Thirty borderline essential hypertensives were randomly assigned to a portable constant-cuff blood pressure feedback technique or meditation-relaxation. Each technique was taught in the laboratory, then practiced twice daily at home for four weeks. Subjects mailed daily records of their progress. Seven feedback and ten meditation-relaxation subjects completed the program. Both techniques produced significant systolic and diastolic reductions within practice sessions and diastolic reductions over weeks of training. Neither technique improved reductions nor reduced initial systolic pressure levels over the four weeks. Differences between biofeedback and meditation-relaxation in within-session pressure reductions were not significant.


    L. B. Atlukhanova


    Full Text Available Two types of non-standard relaxation induced impurity photoconductivity (IIP observed in photoconductors CdS, ZnSe, GaAs and others, depending on the kinetic characteristics of the traps are described. In one case, at the stage of post flashing monotonic decay which is typical for relaxation associated with slow traps (the ratio of the speed of the electron capture to the recombination rate (R << 1, the photo response is experiencing vibrations of low frequency (f =0.03-0.3Hz. Relaxation of the second type characterized by rapid photoelectric traps (R >> 1: measurement alternating signal (f > 20 Hz relaxation curves take the form of curves usual impurity photoconductivity. Electronic processes responsible for relaxation of non-standard IIP are analyzed. For example, fast-centers, which include the characteristic AIIBVI donor Agi0, for the first time in semiconductors experimentally, investigated the dependence of the cross section of electron capture by traps energy released during localization.

  10. An empirical study on measuring the effect of layoff on job satisfaction and employee commitment: A case study of detergent producer unit

    Abolfazl Tajzadeh-Namin


    Full Text Available One of the necessary actions in many organizations is to reduce the number of workers in an attempt to restructure business activities. However, layoff could have negative consequences since many employees may decide to leave since they lose their tolerance. The layoff must be accompanied with some supportive plans to reduce stress among the remaining workers and increase their commitment for long-term work. The present study of this paper considers the effects of layoff on job satisfaction and commitment among the remaining employees of a detergent producer unit. The results indicate that a good supportive program including wage increase, family support, health care plans, etc. could significantly improve employee long-term commitments and it leads to job satisfaction.

  11. A Comparative Study of Fuzzy Logic, Genetic Algorithm, and Gradient-Genetic Algorithm Optimization Methods for Solving the Unit Commitment Problem

    Sahbi Marrouchi


    Full Text Available Due to the continuous increase of the population and the perpetual progress of industry, the energy management presents nowadays a relevant topic that concerns researchers in electrical engineering. Indeed, in order to establish a good exploitation of the electrical grid, it is necessary to solve technical and economic problems. This can only be done through the resolution of the Unit Commitment Problem. Unit Commitment Problem allows optimizing the combination of the production units’ states and determining their production planning, in order to satisfy the expected consumption with minimal cost during a specified period which varies usually from 24 hours to one week. However, each production unit has some constraints that make this problem complex, combinatorial, and nonlinear. This paper presents a comparative study between a strategy based on hybrid gradient-genetic algorithm method and two strategies based on metaheuristic methods, fuzzy logic, and genetic algorithm, in order to predict the combinations and the unit commitment scheduling of each production unit in one side and to minimize the total production cost in the other side. To test the performance of the optimization proposed strategies, strategies have been applied to the IEEE electrical network 14 busses and the obtained results are very promising.

  12. Relationships between Organizational Commitment, Core Job Characteristics, and Organizational Citizenship Behaviors in United States Air Force Organizations


    fact, former Secretary of the Air Force James Roche made retaining Air Force personnel the Air Force’s number one priority and made the retention of...could therefore be used to redesign health organizations in Malaysia to promote commitment (Pearson & Chong, 1997). Although feedback was found not

  13. Unit commitment considering alternating current power flow constraints%交流潮流约束下的机组组合求解

    潘志远; 韩学山; 刘超男


    With the parallel development of distributed generation technology and large power grid technology, a great amount of renewable energy generation was introduced to the electrical power grid. Under this circumstance, a unit commitment model was established by considering the constraints of transmission safety using AC (alternating current) power flow. This model also involved reactive and voltage constraints, as well as safe operation limits of generators. According to the Benders decomposition, the model was decomposed into a master problem and a sub-problem. The master problem could solve the unit commitment without AC constraints, and then the sub-problem could check the AC constraints according to the result of the master problem. Benders cuts might develop from the sub problem, and the cuts would form additional associated constraints, which could connect the master problem and the sub problem. Simulation results of modified IEEE-14 buses case proved that the proposed method could effectively solve unit commitment problems with constraints of AC power flow.%针对当前大电网与分布式发电并进,可再生资源发电大量接入的电网发展格局,构建交流潮流约束下的机组组合模型,在传统考虑有功网络安全约束的基础上,引入无功电压的制约,并计及机组的安全运行极限。依据Benders分解思想,将该模型分解为主、子两个问题,主问题为单母线模型机组组合,子问题为交流潮流约束的检验,通过子问题导引的Benders割形成主、子问题之间关联的附加约束。修正的IEEE-14节点仿真结果表明,该方法能够有效解决交流潮流约束下的机组组合问题。

  14. Model-based investigation of the electricity market. Unit commitment and power plant investments; Modellgestuetzte Untersuchung des Elektrizitaetsmarktes. Kraftwerkseinsatzplanung und -investitionen

    Sun, Ninghong


    The German Federal Government published its energy concept in September 2010 with a description of the road into the era of renewable energies. Therefore, the future renewable energy installed in Germany is expected to consist mostly of wind and solar, which are subject to intermittency of supply and significant fluctuations. The growing portion of energy generation by fluctuating sources is turning to a big challenge for the power plant unit commitment and the investment decisions as well. In this thesis, a fundamental electricity market model with combined modeling of these two aspects is developed. This model is subsequently applied to the German electricity market to investigate what kind of power plant investments are indispensable, considering the steadily increasing portion of energy generation from fluctuating sources, to ensure a reliable energy supply in a cost-effective way in the future. In addition, current energy policy in Germany regarding the use of renewable energy and nuclear energy is analyzed.

  15. GA-based Solution to Stochastic Unit Commitment Problem%基于遗传算法的随机机组组合问题求解

    熊高峰; 聂坤凯; 刘喜苹; 蔡振华; 谢上华


    为考虑不确定性负荷对机组组合问题的影响,通过情景分析法引入一系列的情景对不确定性负荷进行建模,建立了随机机组组合问题的数学模型.采用遗传算法求解该优化问题,可自行满足情景簇约束.通过改进初始种群产生方式和变异算子,引进局部搜索算子对遗传算法进行改进,增强了算法的搜索能力.计算结果显示了随机机组组合问题的数学模型和改进遗传算法求解方法的有效性.%In order to consider the effects of uncertain electric power demand on unit commitment, the uncertainty of electric power demand is modeled by using a set of scenarios, which are introduced by scenario analysis. A mathematical formulation of the expected value model of the stochastic unit commitment (SUC) problem is established. This optimization problem is solved by using a genetic algorithm (GA) , which can automatically satisfy the bundle constraints. The performance of the algorithm is improved by introducing a new method to generate the initial population, a new mutation operator, and a local search operator. Based on numerical examples, test results show the feasibility of the mathematical model of the SUC problem and its improved GA-based solution method.

  16. Formalizing the Relationship Between Commitment and Basic Cryptographic Primitives

    S. Sree Vivek


    Full Text Available Signcryption is a cryptographic primitive which offers the functionality of both digital signature and encryption with lower combined computational cost. On the other hand, commitment scheme allows an entity to commit to a value, where the entity reveals the committed value later during a decommit phase. In this paper, we explore the connection between commitment schemes, public key encryption, digital signatures and signcryption. We establish formal relationship between commitment and the other primitives. Our main result is that we show signcryption can be used as a commitment scheme with appropriate security notions. We show that if the underlying signcryption scheme is IND-CCA2 secure, then the hiding property of the commitment scheme is satisfied. Similarly, we show that if the underlying signcryption scheme is unforgeable, then the relaxed biding property of the commitment scheme is satisfied. Moreover, we prove that if the underlying signcryption scheme is NM-CCA2, then the commitment scheme is non-malleable.

  17. 基于广义Benders分解的启发式机组组合优化%A Generalized Benders Decomposition Based Heuristic Algorithm for Unit Commitment

    李颖浩; 郭瑞鹏


    电力系统机组组合问题是一个高维、离散、非线性的工程优化问题。提出了一种基于Benders分解的启发式算法。该算法一方面充分利用研究时段负荷曲线的特征,将问题进行解耦,减小被研究问题的规模。另一方面,利用Benders分解算法在混合整数规划中的有效性,提高了解决问题的效率。算例表明该方法效率高、结果稳定,有较好的实用价值。%Unit commitment (UC) of power system is a high dimensional, nonlinear and mixed-integer engineering optimization problem. To solve this problem a generalized Benders decomposition based heuristic algorithm is proposed. On the one hand the characteristics of load curve in the time-interval being researched are fully utilized to decouple the problem and to decrease the scale of the problem, on the other hand using the effectiveness of Benders algorithm is solving mixed-integer programming problem the efficiency of solving the problem is improved. Results of calculation example show that the proposed algorithm is efficient and practicable.

  18. Postmarket Requirements and Commitments

    U.S. Department of Health & Human Services — Provides information to the public on postmarket requirements and commitments. The phrase postmarket requirements and commitments refers to studies and clinical...

  19. A Fuzzy Commitment Scheme

    Al-saggaf, Alawi A


    This paper attempt has been made to explain a fuzzy commitment scheme. In the conventional Commitment schemes, both committed string m and valid opening key are required to enable the sender to prove the commitment. However there could be many instances where the transmission involves noise or minor errors arising purely because of the factors over which neither the sender nor the receiver have any control. The fuzzy commitment scheme presented in this paper is to accept the opening key that is close to the original one in suitable distance metric, but not necessarily identical. The concept itself is illustrated with the help of simple situation.

  20. Organizational Commitment in Nurses

    Azizollah Arbabisarjou


    Full Text Available Introduction: As increase in nursing shortages, absenteeism and turn over, organizational commitment is extensively important for retention of nurses. Organizational committed staff has higher efficiency; thus, more tendency to stay and less absenteeism are their characteristics. Being aware of nursing staff’s organizational commitment provides adequate information to authorities to make- decision and lead in adopting proper methods to determine the effectiveness of the Health Centers in the country. Hence, the present study carried out to examine the amount of nurses’ organizational commitment. Materials and Methods: The nurses were 200 subjects who participated in this descriptive- analytical study. They were engaged in teaching hospitals in Zahedan in 2016. Data were collected from 200 nurses in major hospitals. Samples were selected by a random sampling method. Questionnaires, including Demographic data, Organizational Commitment Questionnaires. Data were analyzed by SPSS version 21.0 using descriptive statistics, Pearson correlation, variance analysis and t-test. Findings: The results showed nurses’ average age was 30.05±6.56. The female subjects were 162. The average level of organizational commitment among nurses was 74.24±8.36, emotional commitment was 25.58±3.26. The component, and continued commitment was 24.36±4.05 and 24.30±3.48 for normative commitment. There was no relationship between the age and organizational commitment, emotional and continuing commitment, but their relation was significant with normative commitment. Conclusion: The result of the present study indicated that the grade of the organizational commitment of participating nurses in was moderate, in this study. An organization requires to the staff foe gaining to its goals, who do their duty along love and enthusiasm and are committed to this organization. Proper ground should be established in order to make and maintain these features in the staff.

  1. Career Commitment, Competencies, and Citizenship.

    Carson, Kerry David; Carson, Paula Phillips


    Nursing department employees (n=75) completed the Career Commitment Measure and other measures. Emotional intelligence was positively related to career commitment but not organizational commitment. Both types of commitment were positively related to organizational citizenship. (SK)

  2. Staff nurse commitment, work relationships, and turnover intentions: a latent profile analysis.

    Gellatly, Ian R; Cowden, Tracy L; Cummings, Greta G


    The three-component model of organization commitment has typically been studied using a variable-centered rather than a person-centered approach, preventing a more complete understanding of how these forms of commitment are felt and expressed as a whole. Latent profile analysis was used to identify qualitatively distinct categories or profiles of staff nurses' commitment. Then, associations of the profiles with perceived work unit relations and turnover intentions were examined. Three hundred thirty-six registered nurses provided data on affective, normative, and continuance commitment, perceived work unit relations, and turnover intentions. Latent profile analysis of the nurses' commitment scores revealed six distinct profile groups. Work unit relations and turnover intentions were compared in the six profile-defined groups. Staff nurses with profiles characterized by high affective commitment and/or high normative commitment in relation to other components experienced stronger work unit relations and reported lower turnover intentions. Profiles characterized by high continuance commitment relative to other components or by low overall commitment experienced poorer work unit relations, and the turnover risk was higher. High continuance commitment in combination with high affective and normative commitment was experienced differently than high continuance commitment in combination with low affective and normative commitment. Healthcare organizations often foster commitment by using continuance commitment-enhancing strategies (e.g., offer high salaries and attractive benefits) that may inadvertently introduce behavioral risk. This work suggests the importance of changing the context in which continuance commitment occurs by strengthening the other two components.

  3. Calibrating collective commitments

    Dunin-Keplicz, B; Verbrugge, R; Marik,; Muller, J; Pechoucek, M


    In this paper we aim to formally model the strongest motivational attitude occurring in teamwork, collective commitment. First, building on our previous work, a logical framework is sketched in which social commitments and collective intentions are formalized. Then, different versions of collective

  4. Managing by commitments.

    Sull, Donald N


    What makes a great manager great? Despite differences in their personal attributes, successful managers all excel in the making, honoring, and remaking of commitments. Managerial commitments take many forms, from capital investments to personnel decisions to public statements, but each exerts both immediate and enduring influence on a company. A leader's commitments shape a business's identity, define its strengths and weaknesses, establish its opportunities and limitations, and set its direction. Executives can all too easily forget that commitments are extraordinarily powerful. Caught up in the present, managers often take actions that, while beneficial in the near term, impose lasting constraints on their operations and organizations. When market or competitive conditions change, they can find themselves unable to respond effectively. Managers who understand the nature and power of their commitments can wield them more effectively throughout a company's life cycle. Entrepreneurs can avoid taking actions that imprint a new venture with a dysfunctional character. Managers in established enterprises can buttress past commitments that retain their currency and learn to recognize when commitments have become roadblocks to needed changes. The manager can then replace those roadblocks with new, rejuvenating commitments. That doesn't mean you should try to anticipate all the long-run consequences of every commitment--and it certainly doesn't mean you should shy away from making commitments. But it does mean that before making important decisions about, say, operating processes or partnerships, you should always ask yourself: Is this a process or relationship that we can live with in the future? Am I locking us into a course that we'll come to regret?

  5. Managerial strategy and nursing commitment in Australian hospitals.

    Brewer, A M; Lok, P


    This study examined the relationship of managerial strategy and nursing commitment in Australian hospitals. The general principles of managerial strategy and employee response were illustrated and the meaning of commitment and resistance were defined. Data were collected by questionnaire survey and interviews. The result demonstrated that the middle manager/nurse unit manager played an important role in generating nursing commitment in the workplace. Trust and identification were the most relevant components of nursing commitment. However, the study also found that there was still a high degree of distrust between senior management and nurses. Change strategies which nurse managers could apply to promote greater organizational commitment in nursing are discussed.

  6. Natural relaxation

    Marzola, Luca; Raidal, Martti


    Motivated by natural inflation, we propose a relaxation mechanism consistent with inflationary cosmology that explains the hierarchy between the electroweak scale and Planck scale. This scenario is based on a selection mechanism that identifies the low-scale dynamics as the one that is screened from UV physics. The scenario also predicts the near-criticality and metastability of the Standard Model (SM) vacuum state, explaining the Higgs boson mass observed at the Large Hadron Collider (LHC). Once Majorana right-handed neutrinos are introduced to provide a viable reheating channel, our framework yields a corresponding mass scale that allows for the seesaw mechanism as well as for standard thermal leptogenesis. We argue that considering singlet scalar dark matter extensions of the proposed scenario could solve the vacuum stability problem and discuss how the cosmological constant problem is possibly addressed.

  7. Alzheimer's: From Caring to Commitment

    ... Current Issue Past Issues Home Current issue contents Alzheimer's: From Caring to Commitment From Caring to Commitment ... Caring to Commitment During her sister’s battle with Alzheimer’s, Anne Murphy stayed by her side and continues ...

  8. 风电-火电-抽水蓄能联合优化机组组合模型%Unit Commitment Model for Combined Optimization of Wind Power-Thermal Power-Pumped Storage Hydro

    刘芳; 潘毅; 杨军峰; 周劼英; 周京阳; 朱泽磊; 李强


    大规模间歇式能源出力的不确定性给电网的安全经济运行提出新的挑战,研究间歇式能源接入下的多源联合优化机组组合模型对提高电网运行的安全性和促进间歇式能源的消纳具有重要意义。基于对风电不确定性及抽水蓄能运行机理分析,采用置信区间法进行风电不确定性建模,并提出新的系统调节能力约束,从而建立了考虑风电不确定性影响及抽蓄水头变化影响的联合优化机组组合模型。采用6节点系统验证模型的有效性,研究了抽蓄容量及置信区间选择对发电成本、机组组合及其可靠性的影响。结果显示,风电、火电装机不变的情况下,要保证机组组合的可靠性达99%以上,抽蓄发电装机占比分别为5.6%和10.5%时,与无抽蓄时相比可以分别减少16和17个开机时段,发电成本可以分别降低4.6%和6.8%。通过算例的论证,表明该机组组合模型能够实现多元能源的协调优化和给定置信区间内的风电的有效消纳。%The uncertainty of large-scale intermittent energy poses new challenges to grid operation, it is important to study unit commitment model for combined optimization of multi-source with intermittent energy to improve operation security and promote the utilization of intermittent energy. Based on analysis of the uncertainty of wind power and operational mechanism of pumped storage, this paper used confidence interval method to model the uncertainty, and proposed new constraints about system adjustment ability to establish unit commitment model considering wind power’s uncertainty and changes in pumped storage water head. This paper used a 6-node system to verify effectiveness of the model, and studied the impacts of pumped storage capacity and confidence interval on generation cost, unit commitment and its reliability. When the installed capacity of both wind and thermal power is fixed and the reliability of unit

  9. Optimization of unit commitment of marine power system using improved genetic algorithm%改进型遗传算法在机组负荷优化组合中的应用

    杨昆; 欧阳光耀; 陈海龙


    In accordance with the characteristics of the unit commitment problem in marine power system, we propose an improved genetic algorithm with-both float-point coding and binary coding. To apply the nonlinear 0-1 mixed integer programming to the optimization of the unit commitment, other items in the algorithm are modified accordingly, including the coding and decoding modes, initial population creation, constraint conditions disposal, fitness function selection, genetic operators and the control parameters modulation. In the application of this improved algorithm, not only the constraint conditions can be handled more readily, but the convergence speed and the solution precision are also improved. The application advantage is demonstrated by a 2% reduction in average oil consumption rate.%针对某舰用电站机组负荷组合的特点,提出了一种基于浮点数和二进制数统一编码的改进遗传算法,并进一步对算法中的编码解码方式、初始种群生成、约束条件处理、遗传算子映射及控制参数调节等作了改进,解决了机组优化组合的0-l混合整数非线性规划问题.改进后的算法不仅较好地处理了机组优化组合中的各种约束条件,同时改善了算法的收敛性.优化结果表明机组油耗率降幅最大可达2%,效果显著.

  10. 规模化电动汽车和风电协同调度的机组组合问题研究%Unit commitment considering coordinated dispatch of large scale electric vehicles and wind power generation

    汪春; 吴可; 张祥文; 孙海顺; 张聪; 许晓慧


    基于电动汽车通过集中控制器与电网交互的模式,考虑集中控制器所辖区域电动汽车负荷每个调度时段的可控特性,提出将集中控制器充电负荷作为机组组合模型的控制变量。通过蒙特卡洛抽样模拟电动汽车并网场景,计算集中控制器的可调度上限值和下限值,建立了规模化电动汽车与风电协同调度的机组组合模型。算例分析结果表明了应用提出的机组组合模型提高风电消纳能力和降低系统运行成本的有效性。%Assuming that all electric vehicles integrated to the grid are managed by aggregators, this paper proposes that the charging load of each EV aggregator can be dispatched within the unit commitment model taking the controllability of the charging of EVs at each dispatched time period into consideration. This can be accomplished by assessing the upper and lower limit of charging load of each EV aggregator based on the grid connected EVs scenarios simulation using Monte Carlo method. A unit commitment (UC) model is proposed for optimal coordination of wind power generation and charging load of EV aggregators. Cases study show that with the proposed UC model the wind abandon can be decreased as well as the cost of operation effectively.

  11. Organizational commitment: Does religiosity matter?

    Farrukh, Muhammad; Wei Ying, Chong; Abdallah Ahmed, Nazar Omer


    .... Findings and contribution: The findings showed a positive relationship between religiosity, affective and normative commitment while no association was found between religiosity and continuance commitment...

  12. Relaxing competition through speculation : Committing to a negative supply slope

    Holmberg, Par; Willems, Bert


    We demonstrate how commodity producers can take strategic speculative positions in derivatives markets to soften competition in the spot market. In our game, producers first choose a portfolio of call options and then compete in supply functions. In equilibrium, producers sell forward contracts and

  13. Relaxing Competition through Speculation : Committing to a Negative Supply Slope

    Holmberg, P.; Willems, Bert


    Abstract: We demonstrate how suppliers can take strategic speculative positions in derivatives markets to soften competition in the spot market. In our game, suppliers first choose a portfolio of call options and then compete with supply functions. In equilibrium firms sell forward contracts and buy

  14. 基于场景树和机会约束规划的含风电场电力系统机组组合%Unit commitment with wind farms using scenario tree and chance-constrained programming

    张步涵; 邵剑; 吴小珊; 王魁


      为了解决风电的随机波动性给含大规模风电场电力系统机组组合问题求解带来的影响,采用马尔科夫链原理描述风速变化的规律,并将它与场景树技术相结合,对风电的不确定性进行数学建模。同时基于机会约束规划建立了含风电场机组组合问题的随机数学模型,包含外层机组启停状态优化和内层机组间负荷经济分配两层优化子问题。在求解模型时,将离散粒子群算法(DPSO)与等微增率准则相结合,对两层优化问题进行交替迭代求解;同时提出开停机调整策略改善解的特性。对一个含风电场的10常规机组系统进行算例分析,验证了所提出数学模型和求解方法的合理性和有效性。%In order to cope with the difficulties brought by the volatile and intermittent nature of wind power when solving the unit commitment problem with large-scale wind farms, the basic principles of Markov chain are adopted to describe the regularity of the change of wind speed, and used to model the uncertainty of wind power combining with scenario tree. And this paper presents a stochastic programming model based on chance-constrained programming, and the unit commitment problem is decomposed into two embedded optimization sub-problems: the unit on/off status schedule problem and the load economic dispatch problem. The two problems are solved alternately and iteratively by discrete particle swarm optimization (DPSO) and the equal incremental principle, and an adjusted strategy of units’ on/off status enhances the algorithm’s optimization performance. The results on a system with 10 thermal units and wind farms demonstrate the feasibility and effectiveness of the proposed model and algorithm. This work is supported by National High-tech R & D Program of China (863 Program) (No. 2011AA05A101).

  15. 考虑需求侧低碳资源的新型模糊双目标机组组合模型%A Novel Fuzzy Bi-objective Unit Commitment Model Considering Demand Side Low-carbon Resources

    张宁; 胡兆光; 周渝慧; 肖欣; 王一依; 丛炘玮


    提出一种可促进电力系统碳减排的新型机组组合模型。相比于传统模型,该模型在以下两方面进行了改进:一是综合考虑供应侧资源与需求响应、电动汽车、分布式可再生能源发电等低碳的需求侧资源的最优组合;二是机组调度的规则在经济目标之外充分考虑碳排放目标,提出可计及目标相对优先级的模糊双目标优化方法。另外,在求解优化模型时,对粒子群优化算法进行改进,引入了遗传算法中的“交叉”、“变异”两个算子,提高了粒子群算法的全局寻优能力。通过对10机系统进行算例分析,验证了模型与算法的有效性。%A novel unit commitment model to promote carbon reduction of a power system is proposed.Compared with traditional models,this one is improved in the following two aspects.On the one hand,low-carbon demand side resources, such as demand response,vehicle to grid and distributed renewable energy generation,are considered together with power supply resources to achieve an optimal schedule.On the other hand,a new fuzzy bi-objective optimization approach that can reflect the relevant priority between objectives is presented to strike an effective balance between economic objective and carbon emission objective.To solve the unit commitment optimization problem,the particle swarm optimization (PSO) is improved by employing crossover operator and mutation operator from the genetic algorithm,which enhances the global optimization ability of PSO.Numerical studies of a 10-unit system have verified the effectiveness of the model and the algorithm.

  16. The United States cover-up of Japanese wartime medical atrocities: complicity committed in the national interest and two proposals for contemporary action.

    Nie, Jing-Bao


    To monopolize the scientific data gained by Japanese physicians and researchers from vivisections and other barbarous experiments performed on living humans in biological warfare programs such as Unit 731, immediately after the war the United States (US) government secretly granted those involved immunity from war crimes prosecution, withdrew vital information from the International Military Tribunal for the Far East, and publicly denounced otherwise irrefutable evidence from other sources such as the Russian Khabarovsk trial. Acting in "the national interest" and for the security of the US, authorities in the US tramped justice and morality, and engaged in what the English common law tradition clearly defines as "complicity after the fact." To repair this historical injustice, the US government should issue an official apology and offer appropriate compensation for having covered up Japanese medical war crimes for six decades. To help prevent similar acts of aiding principal offender(s) in the future, international declarations or codes of human rights and medical ethics should include a clause banning any kind of complicity in any unethical medicine-whether before or after the fact-by any state or group for whatever reasons.

  17. Following the terrorist attacks recently committed in the United States of America, and according to the recommendations of the Council of the European Union, the CERN staff observed 3 minutes of silence on Friday 14 September 2001 at 12h00, as a sign of deepest sympathy for all the victims and their families, and of solidarity with the American people

    Maximilien Brice


    Following the terrorist attacks recently committed in the United States of America, and according to the recommendations of the Council of the European Union, the CERN staff observed 3 minutes of silence on Friday 14 September 2001 at 12h00, as a sign of deepest sympathy for all the victims and their families, and of solidarity with the American people

  18. Commitment to Peace.

    Montessori, Renilde


    This reprint from a 1985 issue of "The NAMTA Journal" discusses the ideas of Maria Montessori and Erich Fromm in relation to world peace and the role of education in promoting peace. Also examines the nature of conflict, war, and peace, and the need to commit oneself to peace. (MDM)

  19. Committed Sport Event Volunteers

    Han, Keunsu; Quarterman, Jerome; Strigas, Ethan; Ha, Jaehyun; Lee, Seungbum


    The purpose of this study was to investigate the relationships among selected demographic characteristics (income, education and age), motivation and commitment of volunteers at a sporting event. Three-hundred and five questionnaires were collected from volunteers in a marathon event and analyzed using structural equation modeling (SEM). Based on…

  20. Commitments by hostage posting

    Raub, W.; Baurmann, M.; Lahno, B.


    We survey research on incurring commitments by voluntary hostage posting as a mechanism of cooperation. The Trust Game is employed as a paradigmatic example of cooperation problems. We sketch a very simple game-theoretic model that shows how voluntary hostage posting can bind the trustee and thus in

  1. Commitment to Peace.

    Montessori, Renilde


    This reprint from a 1985 issue of "The NAMTA Journal" discusses the ideas of Maria Montessori and Erich Fromm in relation to world peace and the role of education in promoting peace. Also examines the nature of conflict, war, and peace, and the need to commit oneself to peace. (MDM)

  2. Moral Commitment in Intimate Committed Relationships: A Conceptualization from Cohabiting Same-Sex and Opposite-Sex Partners

    Pope, Amber Leighann


    Diverse types of intimate committed relationships, namely cohabiting same-sex and opposite-sex partnerships, are increasingly prevalent in the United States (Bumpass & Lu, 2000; Garber, 2005; U.S. Census Bureau, 2000). Given the rise in the number of individuals participating in intimate committed relationships outside of the marital context,…

  3. From controlled to committed.

    Hess, J C


    Most of us agree that people are our most important resource. Yet we spend a minimal amount of time learning more about human behavior, communication, and how our attitudes and behavior impact employee performance. Instead we rely on traditional methods of negative reinforcement in an attempt to control our areas of responsibility. While these methods can render some short-term success, managers and organizations that succeed during these times of change and fierce competition will be those that take the time to understand and capture the power of a committed workforce. The committed workforce is energized, not simply compliant, as a result of having basic human needs for achievement satisfied, belonging to a group, and receiving recognition for its contributions. Committed workers typically describe the manager as one who has the ability to give them a great degree of control over their area of influence. We all know that we don't change our leadership style like we change clothes. Old habits die hard. it takes a personal commitment and lots of practice to rid outselves of habits and behavior that no longer serve our departments and facilities. This commitment, however, is crucial to survival. As managers, we must cope with increasing ambiguity and uncertainty in the workplace. To survive these challenges, we must improve our interpersonal skills and ability to successfully bring out the best in others. I believe that success will continue for managers who not only increase their knowledge and technical ability, but who also inspire their workers to move forward with a collective sense of enthusiasm and purpose.

  4. Factors Contributing to Personal Commitment in Chinese Interethnic Couples

    Xinmiao Zhong


    Full Text Available Interethnic relationships are increasingly common in many societies, yet interethnic couples have a higher divorce rate compared to intraethnic couples. Given these facts and the dearth of research, this study aimed to identify factors that contribute to couples’ commitment in interethnic relationships. This study investigated the personal commitment of Chinese interethnic couples in the United Kingdom and the United States. Specifically, whether love, dyadic adjustment and “couple cultural identity” (i.e. acculturation to the partner and couple’s similarity on individualism/collectivism would predict personal commitment and whether each variable would account for unique variance in personal commitment of the participants. Thirty-seven Chinese/non-Chinese heterosexual couples participated in the study and significant relationships between love and personal commitment, dyadic adjustment and personal commitment were found. Also, couple cultural identity was important for women’s personal commitment. Multiple regression and structural equation modelling showed that partners in interethnic relationships defined personal commitment in different ways with men emphasizing love and dyadic adjustment, and women emphasizing love and acculturation to their partner. The discovery of the importance of couple cultural identity in contributing to personal commitment, besides love and dyadic adjustment, helps researchers to gain a greater understanding of such relationships and to extend the research on interethnic relationships.

  5. Impact of Energy Storage System on the Unit Commitment Problem with Volatile Wind Power%储能系统对含风电的机组组合问题影响分析

    谢毓广; 江晓东


    分析了储能系统对含风电的机组组合问题的影响,为提高电力系统运行的灵活性和降低风电波动性对机组组合问题的影响,在含风电的机组组合问题中引入储能系统.将含风电和储能系统的机组组合问题描述为混合整数凸规划形式,采用分支定界结合内点法进行求解.采用最优优先搜索和深度优先搜索相结合的搜索策略提高分支定界的搜索效率.通过10机系统算例分析,表明储能系统的引入可明显地降低风电波动性对机组组合问题的不利影响.%This paper presents a simulation method that can assess the impact of energy storage system (ESS) on the unit commitment (UC) problem with volatile wind power. In order to achieve the higher system flexibility and reduce the impact of volatility of wind power, ESS is incorporated into the UC problem with wind power. The UC problem with wind power and ESS is formulated as the mixed-integer convex program, which is optimized by branch and bound combined with interior point method. During the branch and bound process, best first search and depth first search are combined to expedite the computation. Numerical simulations on a ten-unit system show that the introduction' of ESS is effective to reduce the impact of volatility of wind power on the UC problem.

  6. Smooth transition between SMM and SCM-type slow relaxing dynamics for a 1-D assemblage of {Dy(nitronyl nitroxide)2} units.

    Liu, Ruina; Li, Licun; Wang, Xiaoling; Yang, Peipei; Wang, Chao; Liao, Daizheng; Sutter, Jean-Pascal


    A model example for size effects on the dynamic susceptibility behavior is provided by the chain compound [{Dy(hfac)(3)NitPhIm(2)}Dy(hfac)(3)] (NitPhIm = 2-[4-(1-imidazole)phenyl]nitronyl nitroxide radical). The Arrhenius plot reveals two relaxation regimes attributed to SMM (Delta = 17.1 K and tau(0) = 17.5 x 10(-6) s) and SCM (Delta = 82.7 K and tau(0) = 8.8 x 10(-8) s) behaviors. The ferromagnetic exchange among the spin carriers has been established for the corresponding Gd derivative.

  7. Sustainability Marketing Commitment

    Tollin, Karin; Bech Christensen, Lars


    Corporate sustainability is an important strategy and value orientation for marketing, but scarce research addresses the organizational drivers and barriers to including it in companies’ marketing strategies and processes. The purpose of this study is to determine levels of commitment to corporate...... sustainability in marketing, processes associated with sustainability marketing commitment, drivers of sustainability marketing at the functional level of marketing, and its organizational context. Using survey data from 269 managers in marketing, covering a broad range of industries in Sweden and Denmark, we...... took a structural modelling approach to examine construct relationships, mediation, and moderation effects. Overall, the findings show that marketing capabilities associated with the innovation of new products, services, and business models constitute a strong driver to leverage sustainability...

  8. The Commitment Objective

    Milton; Kotler; President


    "So,tell me about Action Selling,"Matt said."It starts with Commitment Objectives?""All right,"Joe began,"first you tell me if this sounds familiar:You've made an initial appointment with a great prospect-call him Mr.Wright.You're heard his company has had some problems with its current vendor,and you figure they're ready to make a change.You're pumped.

  9. Robust relativistic bit commitment

    Chakraborty, Kaushik; Chailloux, André; Leverrier, Anthony


    Relativistic cryptography exploits the fact that no information can travel faster than the speed of light in order to obtain security guarantees that cannot be achieved from the laws of quantum mechanics alone. Recently, Lunghi et al. [Phys. Rev. Lett. 115, 030502 (2015), 10.1103/PhysRevLett.115.030502] presented a bit-commitment scheme where each party uses two agents that exchange classical information in a synchronized fashion, and that is both hiding and binding. A caveat is that the commitment time is intrinsically limited by the spatial configuration of the players, and increasing this time requires the agents to exchange messages during the whole duration of the protocol. While such a solution remains computationally attractive, its practicality is severely limited in realistic settings since all communication must remain perfectly synchronized at all times. In this work, we introduce a robust protocol for relativistic bit commitment that tolerates failures of the classical communication network. This is done by adding a third agent to both parties. Our scheme provides a quadratic improvement in terms of expected sustain time compared with the original protocol, while retaining the same level of security.

  10. How Exactly Do I “Let Go”? The Potential of Using ACT to Overcome the Relaxation Paradox

    Christopher J. Wilson


    Full Text Available Relaxation induced anxiety (RIA or relaxation induced panic (RIP occurs when a person’s attempts to reduce anxiety result in increased arousal. Such paradoxical increases often occur when relaxation is viewed as the avoidance of anxiety-related experiences. In fact, passivity toward these experiences is necessary for successful relaxation. However, passivity is not always easy to understand. Acceptance and commitment therapy (ACT has attracted increasing interest in recent years and adopts a similar position with regard to experiential avoidance. Reviewing literature on the relaxation paradox, this article argues that incorporating elements of ACT into relaxation training might help overcome some problems with passivity in relaxation.

  11. Relaxation Techniques for Health

    ... R S T U V W X Y Z Relaxation Techniques for Health Share: On This Page What’s the ... Bottom Line? How much do we know about relaxation techniques? A substantial amount of research has been done ...

  12. Organizational commitment of military physicians.

    Demir, Cesim; Sahin, Bayram; Teke, Kadir; Ucar, Muharrem; Kursun, Olcay


    An individual's loyalty or bond to his or her employing organization, referred to as organizational commitment, influences various organizational outcomes such as employee motivation, job satisfaction, performance, accomplishment of organizational goals, employee turnover, and absenteeism. Therefore, as in other sectors, employee commitment is crucial also in the healthcare market. This study investigates the effects of organizational factors and personal characteristics on organizational commitment of military physicians using structural equation modeling (SEM) on a self-report, cross-sectional survey that consisted of 635 physicians working in the 2 biggest military hospitals in Turkey. The results of this study indicate that professional commitment and organizational incentives contribute positively to organizational commitment, whereas conflict with organizational goals makes a significantly negative contribution to it. These results might help develop strategies to increase employee commitment, especially in healthcare organizations, because job-related factors have been found to possess greater impact on organizational commitment than personal characteristics.

  13. Latent Period of Relaxation.

    Kobayashi, M; Irisawa, H


    The latent period of relaxation of molluscan myocardium due to anodal current is much longer than that of contraction. Although the rate and the grade of relaxation are intimately related to both the stimulus condition and the muscle tension, the latent period of relaxation remains constant, except when the temperature of the bathing fluid is changed.

  14. The Fold of Commitment

    Raastrup Kristensen, Anders; Pedersen, Michael


    This paper serves two purposes. First, a rereading of Douglas McGregor’s An uneasy look at performance appraisal serves to show how McGregor’s conceptualization of commitment as a question of integrating personal goals with organizational purpose has helped shape founding the modern understanding...... of corporate community representation. Second, we suggest that French philosopher Gilles Deleuze’s concepts of fold, desire and interests can be useful in comprehending this modern form of corporate representation already present in McGregor’s text....

  15. [Acceptance and commitment therapy].

    Ducasse, D; Fond, G


    Acceptance and commitment therapy (ACT) is a third generation of cognitive-behavioral therapies. The point is to help patients to improve their psychological flexibility in order to accept unavoidable private events. Thus, they have the opportunity to invest energy in committed actions rather than struggle against their psychological events. (i) To present the ACT basic concepts and (ii) to propose a systematic review of the literature about effectiveness of this kind of psychotherapy. (i) The core concepts of ACT come from Monestès (2011), Schoendorff (2011), and Harris (2012); (ii) we conducted a systematic review of the literature using the PRISMA's criteria. The research paradigm was « acceptance and commitment therapy AND randomized controlled trial ». The bases of the MEDLINE, Cochrane and Web of science have been checked. Overall, 61 articles have been found, of which, after reading the abstracts, 40 corresponded to the subject of our study. (I) Psychological flexibility is established through six core ACT processes (cognitive defusion, acceptance, being present, values, committed action, self as context), while the therapist emphasizes on experiential approach. (II) Emerging research shows that ACT is efficacious in the psychological treatment of a wide range of psychiatric problems, including psychosis, depression, obsessive-compulsive disorder, trichotillomania, generalized anxiety disorder, post-traumatic stress disorder, borderline personality disorder, eating disorders. ACT has also shown a utility in other areas of medicine: the management chronic pain, drug-dependence, smoking cessation, the management of epilepsy, diabetic self-management, the management of work stress, the management of tinnitus, and the management of multiple sclerosis. Meta-analysis of controlled outcome studies reported an average effect size (Cohen's d) of 0.66 at post-treatment (n=704) and 0.65 (n=580) at follow-up (on average 19.2 weeks later). In studies involving

  16. 基于模糊决策方法的含风电场电力系统机组组合%Fuzzy Decision-Making Based Unit Commitment of Power Grid Integrated With Wind Farms

    李群; 张刘冬; 殷明慧; 张小莲; 邹云


    Combining confidence interval based uncertainty analysis on wind power with fuzzy decision-making, a fuzzy unit commitment model of power grid integrated with wind farms, in which the risk of wind power prediction uncertainty is taken into account, is proposed. In the proposed model the fuzzy decision-making is utilized to minimize both generation cost of units and loss-of-load risk of power grid to remedy the defect in existing models that the foundation for the selection of the confidence interval is not given. Besides, in the proposed model an uncertainty model for wind power prediction, which conforms to actual situation, is adopted to ensure the practicality of the proposed model. The proposed model is solved by mixed integer linear programming (MILP). The advantages and validity of the proposed model are verified by simulation results of IEEE RTS 26 test system connected with a wind farm.%结合基于置信区间的风电功率不确定性分析方法和模糊决策方法,提出了计及风电功率预测不确定性风险的含风电场的电力系统模糊机组组合模型。该模型采用模糊决策方法实现了机组发电成本和系统失负荷风险最小的目标,解决了已有模型中未给出置信区间选取依据的不足。此外,该模型采用贴合实际的风电预测不确定模型,保证了该模型的实用性。采用混合整数线性规划(mixed integer linear programming,MILP)方法对所提出的模型进行求解。通过对含风电场的IEEE RTS 26测试系统进行仿真,验证了该模型的有效性和优越性。

  17. Committed equivalent organ doses and committed effective doses from intakes of radionuclides

    Phipps, A W; Kendall, G M; Silk, T J; Stather, J W


    This report contains details of committed equivalent doses to individual organs for intakes by ingestion and inhalation of 1 mu m AMAD particles of 359 nuclides by infants aged 3 months, by children aged 1, 5, 10 and 15 years, and by adults. It complements NRPB-R245 which describes the changes which have taken place since the last NRPB compendium of dose per unit intake factors (dose coefficients) and gives summary tables. Information on the way committed doses increase with the integration period is given in NRPB-M289. The information given in these memoranda is also available as a microcomputer package - NRPB-SR245.

  18. Experimental unconditionally secure bit commitment

    Liu, Yang; Cao, Yuan; Curty, Marcos; Liao, Sheng-Kai; Wang, Jian; Cui, Ke; Li, Yu-Huai; Lin, Ze-Hong; Sun, Qi-Chao; Li, Dong-Dong; Zhang, Hong-Fei; Zhao, Yong; Chen, Teng-Yun; Peng, Cheng-Zhi; Zhang, Qiang; Cabello, Adan; Pan, Jian-Wei


    Quantum physics allows unconditionally secure communication between parties that trust each other. However, when they do not trust each other such as in the bit commitment, quantum physics is not enough to guarantee security. Only when relativistic causality constraints combined, the unconditional secure bit commitment becomes feasible. Here we experimentally implement a quantum bit commitment with relativistic constraints that offers unconditional security. The commitment is made through quantum measurements in two quantum key distribution systems in which the results are transmitted via free-space optical communication to two agents separated with more than 20 km. Bits are successfully committed with less than 5 . 68 ×10-2 cheating probability. This provides an experimental proof of unconditional secure bit commitment and demonstrates the feasibility of relativistic quantum communication.

  19. 75 FR 45693 - Request for Comments and Notice of Public Hearing Concerning China's Compliance With WTO Commitments


    ... multilateral commitments and any bilateral commitments made to the United States. In accordance with section... agreements. The Protocol and Working Party Report can be found on the Department of Commerce Webpage, http...

  20. 基于奔德斯算法的安全约束机组组合方法%A Method for Security Constrained Unit Commitment Based on Benders Algorithm

    王楠; 张粒子; 袁喆; 张黎明; 李雪


    When security-constrained unit commitment (SCUC) was directly solved by mixed integer programming algorithm, the calculation efficiency would considerably decrease, and when SCUC was solved by Benders algorithm, it led to the problem that the solution efficiency would decrease due to the algorithm shock and the restriction of system scale. A new Benders algorithm-based method to solve SCUC was proposed. Based on Benders algorithm, by means of adding the link to correct the constraint of out-of-limit after the iteration of Benders master problem, the search direction of Benders cut could be controlled; by means of adding the link to identify taken-effect constraints the search space of Benders algorithm was reduced, thus the solution efficiency of SCUC optimization could be improved. The effectiveness of the proposed method was verified by simulation results of 6-machine 3-bus system and 54-machine 118-bus system.%针对采用混合整数规划算法直接求解安全约束机组组合,将使计算效率大幅度降低,而利用奔德斯算法求解则存在着算法振荡和受系统规模制约求解效率下降的问题,提出了一种基于奔德斯算法的安全约束机组组合新方法.该方法在奔德斯算法的基础上,通过纳入新增越限约束校正环节,控制了奔德斯割的寻优方向,通过增加起作用约束识别环节,缩小了奔德斯算法的寻优空间,进而提高了安全约束机组组合优化问题的求解效率.6机3节点和54机118节点算例验证了所提方法的有效性.

  1. 安全约束机组组合理论与应用的发展和展望%Review and Prospects of the Security Constrained Unit Commitment Theory and Applications

    夏清; 钟海旺; 康重庆


    安全约束机组组合作为编制发电计划的核心环节,在国外电力市场中已经得到广泛的应用.随着中国电网全面推进精益化的调度管理和节能发电调度的实施,电网运行部门对安全经济运行的要求日益提高,安全约束机组组合的研究和应用也越来越受到重视.总结了安全约束机组组合的模式、数学模型和主要求解方法;在综述国内外最新研究动态和工业应用现状的基础上,展望了未来有待进一步研究的内容.希望本文的工作能够为推动中国发电计划领域的研究和应用提供重要参考.%Security constrained unit commitment (SCUC),as the key procedure of generation scheduling,has been widely used in electricity markets abroad.With the promotion of lean management in power dispatch and the implementation of energy conservation based power generation dispatch,the system operator has an increasingly demanding requirement on the secure and economic operations.Therefore,the research and applications of SCUC have been paid more and more attention.This paper summarized the patterns,mathematical models and major algorithms of SCUC.Based on the survey of the state-of-the-art of SCUC research and industrial applications in China and abroad,the potential research topics were proposed.Hopefully,this paper could be an important reference for the theoretical study and industrial applications of generation scheduling in China.

  2. Organizational Climate and Teacher Commitment

    Douglas, Stephen Michael


    This study examined the relationship of school climate and teacher commitment in elementary schools in Alabama. A total of 67 elementary schools were surveyed and 1353 teachers voluntarily participated in the study. The instruments used in this study were the Organizational Climate Index (OCI) and the Organizational Commitment Questionnaire (OCQ).…

  3. Organizational Climate and Teacher Commitment

    Douglas, Stephen Michael


    This study examined the relationship of school climate and teacher commitment in elementary schools in Alabama. A total of 67 elementary schools were surveyed and 1353 teachers voluntarily participated in the study. The instruments used in this study were the Organizational Climate Index (OCI) and the Organizational Commitment Questionnaire (OCQ).…

  4. Statistical secrecy and multibit commitments

    Damgård, Ivan Bjerre; Pedersen, Torben P.; Pfitzmann, Birgit


    nothing about it. One definition is based on the L1-norm distance between probability distributions, the other on information theory. We prove that the two definitions are essentially equivalent. We also show that statistical counterparts of definitions of computational secrecy are essentially equivalent......We present and compare definitions of "statistically hiding" protocols, and we propose a novel statistically hiding commitment scheme. Informally, a protocol statistically hides a secret if a computationally unlimited adversary who conducts the protocol with the owner of the secret learns almost...... to our main definitions. Commitment schemes are an important cryptologic primitive. Their purpose is to commit one party to a certain value, while hiding this value from the other party until some later time. We present a statistically hiding commitment scheme allowing commitment to many bits...

  5. Committing to Green


    This year the fifth anniversary since China ratified the Kyoto Protocol in 2002. Almost 10 years ago,in 1997,thefirst draft of the global warming pact was completed by 149 state and regional representatives at the Third Plenary Session of the United Nations Framework Convention on Climate Change


    Adrian Cristian MOISE


    In this study, starting with the presentation of some aspects regarding management of identity in cyberspace, it is carried out the analysis of the offence of identity theft committed through Internet. The term “identity theft” describes the criminal acts through which the offender obtains and uses in a fraudulent manner the identity of other person. These criminal acts may be carried out through the use of information and communication technology, too. The cases of identity theft committed t...

  7. NATO: Revisiting American Commitment


    been short sighted. Kurt Volker , 4 former U.S. ambassador to NATO, posits that it was this decision by the United States in 2001 to set aside...ineffective with “virtually no prospect that their soldiers would fire a shot in anger.”10 This situation in turn reduces the overall morale of the force...Potomac Books, 2011), 5. 3 Ibid., 47. 4 Kurt Volker , “Reaffirming Transatlantic Unity”, Policy Review, Hoover Institution, March 30, 2012. 5

  8. Committed warming inferred from observations

    Mauritsen, Thorsten; Pincus, Robert


    Due to the lifetime of CO2, the thermal inertia of the oceans, and the temporary impacts of short-lived aerosols and reactive greenhouse gases, the Earth’s climate is not equilibrated with anthropogenic forcing. As a result, even if fossil-fuel emissions were to suddenly cease, some level of committed warming is expected due to past emissions as studied previously using climate models. Here, we provide an observational-based quantification of this committed warming using the instrument record of global-mean warming, recently improved estimates of Earth’s energy imbalance, and estimates of radiative forcing from the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. Compared with pre-industrial levels, we find a committed warming of 1.5 K (0.9-3.6, 5th-95th percentile) at equilibrium, and of 1.3 K (0.9-2.3) within this century. However, when assuming that ocean carbon uptake cancels remnant greenhouse gas-induced warming on centennial timescales, committed warming is reduced to 1.1 K (0.7-1.8). In the latter case there is a 13% risk that committed warming already exceeds the 1.5 K target set in Paris. Regular updates of these observationally constrained committed warming estimates, although simplistic, can provide transparent guidance as uncertainty regarding transient climate sensitivity inevitably narrows and the understanding of the limitations of the framework is advanced.

  9. Indentation load relaxation test

    Hannula, S.P.; Stone, D.; Li, C.Y. (Cornell Univ., Ithaca, NY (USA))

    Most of the models that are used to describe the nonelastic behavior of materials utilize stress-strain rate relations which can be obtained by a load relaxation test. The conventional load relaxation test, however, cannot be performed if the volume of the material to be tested is very small. For such applications the indentation type of test offers an attractive means of obtaining data necessary for materials characterization. In this work the feasibility of the indentation load relaxation test is studied. Experimental techniques are described together with results on Al, Cu and 316 SS. These results are compared to those of conventional uniaxial load relaxation tests, and the conversion of the load-indentation rate data into the stress-strain rate data is discussed.

  10. Relaxation techniques for stress

    ... problems such as high blood pressure, stomachaches, headaches, anxiety, and depression. Using relaxation techniques can help you feel calm. These exercises can also help you manage stress and ease the effects of stress on your body.

  11. Perturbations and quantum relaxation

    Kandhadai, Adithya


    We investigate whether small perturbations can cause relaxation to quantum equilibrium over very long timescales. We consider in particular a two-dimensional harmonic oscillator, which can serve as a model of a field mode on expanding space. We assume an initial wave function with small perturbations to the ground state. We present evidence that the trajectories are highly confined so as to preclude relaxation to equilibrium even over very long timescales. Cosmological implications are briefly discussed.

  12. Redheffer representations and relaxed commutant lifting

    ter Horst, S.


    It is well known that the solutions of a (relaxed) commutant lifting problem can be described via a linear fractional representation of the Redheffer type. The coefficients of such Redheffer representations are analytic operator-valued functions defined on the unit disc D of the complex plane. In th

  13. Management Commitment to Safety, Teamwork, and Hospital Worker Injuries.

    McGonagle, Alyssa K; Essenmacher, Lynnette; Hamblin, Lydia; Luborsky, Mark; Upfal, Mark; Arnetz, Judith


    Although many studies link teamwork in health care settings to patient safety, evidence linking teamwork to hospital worker safety is lacking. This study addresses this gap by providing evidence linking teamwork perceptions in hospital workers to worker injuries, and further, finds a linkage between manager commitment to safety and teamwork. Organizational records of worker injuries and survey responses regarding management commitment to safety and teamwork from 446 hospital workers within 42 work units in a multi-site hospital system were examined. Results underscored the particular importance of teamwork on worker injuries as well as the importance of management commitment to safety as relating to teamwork. To improve worker safety, organizational leaders and unit managers should work to maintain environments wherein teamwork can thrive.

  14. Using commitment to improve environmental quality

    Lokhorst, Anne Marike


    The making of commitments is often used as an intervention aimed at increasing pro-environmental behavior. Research shows that when people commit to changing their environmental behaviors, they tend to adhere to their commitments. In this dissertation it is investigated whether commitment making is

  15. The effect of muscle relaxant antagonismon on patients with residual paralysis in postanesthesia care unit%肌松拮抗对麻醉恢复室患者残余阻滞作用的影响

    汪忠玉; 吴新海; 郑利民


    目的 探讨肌松拮抗药对麻醉恢复室患者残余阻滞作用的影响.方法 从入麻醉恢复室(PACU)患者中选出相似的患者进行配对,分为实验组(J组)和对照组(F组),每组26例,术后PACU内用四个成串刺激(TOF)监测肌松,TOF为4时J组给予新斯的明40 μg/kg、阿托品20 μg/kg;F组给予5ml生理盐水.按临床指征拔管,记录拔管时的TOF值、PaO2、PaCO2、离开PACU时SpO2、PACU停留时间以及是否出现呼吸抑制和副作用.结果 J组拔管时的TOF值(0.96 ±0.04)明显较F组(0.92±0.06)高(P<0.05),PACU停留时间[(26 ±5)min]也短于F组[(33±7)min](P <0.01).F组有2例出现呼吸抑制.拔管时的PaO2及PaCO2、拔管时间、离开PACU的SpO2两组差异无统计学意义(P>0.05).两组患者均未出现术后恶心呕吐(PONV)等副作用.结论 常规肌松拮抗使术后残余肌松作用风险降低,缩短PACU停留时间,且无PONV等副作用.%Objective To investigate the effects of muscle relaxant antagonism on patients with residual paralysis in postanesthesia care unit (PACU).Methods The similar patients who were daily accepted into PACU were chosen to make pairs,and were randomly divided into experimental (J; n =26) and control (F; n =26) groups.On arrival to the PACU,the train-of-four ratio (TO-Fr) was assessed using electromyography.When TOFr reached 4,Grour J was given with neostigmine 40 μg/kg and atropine 20 μg/kg; Group F was given with 5ml saline.Extubation was determined with standard clinical criteria.We recorded TOFr,PaO2,PaCO2at the time point of extubation,SpO2 at the time point of left the PACU,the stay time in PACU,the incidence of respiratory dysfunction,and the side effect.Results The TOFr at the time point of extubation in group J (0.96 ± 0.04) was significantly higher than group F (0.92 ±0.06) (P <0.05).The stay time in PACU in group J [(26 ±5)min] was significantly less than group F [(33 ±7) min] (P < 0.01).PaO2,PaCO2,extubation time,and SpO2 were

  16. Our commitment to quality



    The Office of Science Education and Technical Information (OSETI) provides leadership in leveraging the Department of Energy`s (DOE) unique scientific and technical resources to enhance the United States (U.S.) global competitiveness and the development of a diverse, well-educated, scientifically literate workforce. The Office provides scientific and technical information management policy, guidance, and services, as well as education program assistance, to a wide range of customers to help the Department contribute to the Nation`s welfare. OSETI was established in July 1993 within the Science and Technology cluster. The Office has two subcomponents, the Office of Scientific and Technical Information (OSTI), located in Oak Ridge, Tennessee, and the Office of Science Education Programs (OSEP), located in Washington, D.C. (see organization chart on page 5). OSTI, the larger of the two offices, has 164 full-time equivalent (FTE) federal staff and 100 contractor employees, while OSEP has 21 federal and 5 contractor employees.

  17. Job Insecurity and Organizational Commitment

    Bengt Furåker


    Full Text Available This article deals with the relationship between job insecurity and organizational commitment. Our analysis includes both ‘subjective’ and ‘objective’ measures of job insecurity and it also distinguishes between a cognitive and affective component of the subjective dimension. As to organizational commitment, we make a distinction between value commitment and readiness to remain with the employing organization. The empirical basis for the analysis is survey data collected in Sweden in 2010-2011. Some of the outcomes are just as expected: perceived risk of losing one’s job is associated with lower value commitment and less willingness to stay with the organization, while the opposite pattern appears for satisfaction with job security. Other results are more noteworthy: increases in unemployment, temporary employment contracts and worry about losing one’s job are linked to higher value commitment. Being anxious about job loss is also positively related to willingness to stay. These results indicate that insecurity can make people more appreciative of their current work and workplace.

  18. Conscientious commitment to women's health.

    Dickens, Bernard M; Cook, Rebecca J


    Conscientious commitment, the reverse of conscientious objection, inspires healthcare providers to overcome barriers to delivery of reproductive services to protect and advance women's health. History shows social reformers experiencing religious condemnation and imprisonment for promoting means of birth control, until access became popularly accepted. Voluntary sterilization generally followed this pattern to acceptance, but overcoming resistance to voluntary abortion calls for courage and remains challenging. The challenge is aggravated by religious doctrines that view treatment of ectopic pregnancy, spontaneous abortion, and emergency contraception not by reference to women's healthcare needs, but through the lens of abortion. However, modern legal systems increasingly reject this myopic approach. Providers' conscientious commitment is to deliver treatments directed to women's healthcare needs, giving priority to patient care over adherence to conservative religious doctrines or religious self-interest. The development of in vitro fertilization to address childlessness further illustrates the inspiration of conscientious commitment over conservative objections.

  19. Relaxation Dynamics of Semiflexible Fractal Macromolecules

    Jonas Mielke


    Full Text Available We study the dynamics of semiflexible hyperbranched macromolecules having only dendritic units and no linear spacers, while the structure of these macromolecules is modeled through T-fractals. We construct a full set of eigenmodes of the dynamical matrix, which couples the set of Langevin equations. Based on the ensuing relaxation spectra, we analyze the mechanical relaxation moduli. The fractal character of the macromolecules reveals itself in the storage and loss moduli in the intermediate region of frequencies through scaling, whereas at higher frequencies, we observe the locally-dendritic structure that is more pronounced for higher stiffness.

  20. Treating Inpatients with Comorbid Depression and Alcohol Use Disorders: A Comparison of Acceptance and Commitment Therapy

    Petersen, Connie L.; Zettle, Robert D.


    Inpatients involuntarily committed to a chemical dependency unit and exhibiting a co-occurring depressive disorder received either individual sessions of acceptance and commitment therapy (ACT) or treatment as usual (TAU) within the context of an ongoing 12-step program. Results indicated significant, but equivalent, reductions in levels of…

  1. Treating Inpatients with Comorbid Depression and Alcohol Use Disorders: A Comparison of Acceptance and Commitment Therapy

    Petersen, Connie L.; Zettle, Robert D.


    Inpatients involuntarily committed to a chemical dependency unit and exhibiting a co-occurring depressive disorder received either individual sessions of acceptance and commitment therapy (ACT) or treatment as usual (TAU) within the context of an ongoing 12-step program. Results indicated significant, but equivalent, reductions in levels of…

  2. Molecular Relaxation in Liquids

    Bagchi, Biman


    This book brings together many different relaxation phenomena in liquids under a common umbrella and provides a unified view of apparently diverse phenomena. It aligns recent experimental results obtained with modern techniques with recent theoretical developments. Such close interaction between experiment and theory in this area goes back to the works of Einstein, Smoluchowski, Kramers' and de Gennes. Development of ultrafast laser spectroscopy recently allowed study of various relaxation processes directly in the time domain, with time scales going down to picosecond (ps) and femtosecond (fs

  3. Relaxation training after stroke: potential to reduce anxiety.

    Kneebone, Ian; Walker-Samuel, Natalie; Swanston, Jennifer; Otto, Elisabeth


    To consider the feasibility of setting up a relaxation group to treat symptoms of post stroke anxiety in an in-patient post-acute setting; and to explore the effectiveness of relaxation training in reducing self-reported tension. A relaxation group protocol was developed in consultation with a multidisciplinary team and a user group. Over a period of 24 months, 55 stroke patients attended group autogenic relaxation training on a rehabilitation ward. Attendance ranged between one and eleven sessions. Self-reported tension was assessed pre and post relaxation training using the Tension Rating Circles (TRCs). The TRCs identified a significant reduction in self-reported tension from pre to post training, irrespective of the number of sessions attended; z = -3.656, p stroke rehabilitation shows potential. Self-reported tension decreased after attendance at relaxation training. The TRCs proved acceptable to group members, but should be validated against standard anxiety measures. Further exploration of the application of relaxation techniques in clinical practice is desirable. Implications for Rehabilitation Anxiety is prevalent after stroke and likely affects rehabilitation outcomes. Relaxation training is a well proven treatment for anxiety in the non-stroke population. A significant within session reduction in tension, a hallmark symptom of anxiety, was evidenced via group relaxation training delivered in a post-acute, in-patient stroke unit setting. Relaxation training a shows promise as a treatment for anxiety after stroke.

  4. Strategic effects of future environmental policy commitments: climate change, solar radiation management and correlated air pollutants.

    Qu, Jingwen; Silva, Emilson Caputo Delfino


    We study the effects of environmental policy commitments in a futuristic world in which solar radiation management (SRM) can be utilized to reduce climate change damages. Carbon and sulfur dioxide emissions (correlated pollutants) can be reduced through tradable permits. We show that if nations simultaneously commit to carbon permit policies, national SRM levels rise with carbon quotas. Alternatively, if they simultaneously commit to SRM policies, the global temperature falls with each unit increase in the global SRM level. A nation always wishes to be a leader in policymaking, but prefers carbon to SRM policymaking. The globe prefers SRM policy commitments. Copyright © 2014 Elsevier Ltd. All rights reserved.

  5. A study on the relationship between emotional intelligence, organizational commitment and organizational citizenship behavior

    Saman Chehrazi


    Full Text Available This paper presents a casual structure model between emotional intelligence and organizational citizenship behavior by using organizational commitment as mediator variable. The study is accomplished among 324 employees of united bus company in city of Tehran, Iran. Using structural equation modeling, the study has confirmed that emotional intelligence influenced on organizational citizenship behavior and commitment. The study also confirms that organizational commitment influenced on organizational citizenship behavior. Finally, the study has confirmed that there were significant relationships between emotional intelligence and its dimensions with organizational citizenship behavior and organizational commitment of employees.

  6. Idiosyncratic Deals and Organizational Commitment

    Ng, Thomas W. H.; Feldman, Daniel C.


    This article examines the relationship between idiosyncratic deals and organizational commitment. In particular, it examines how two individual differences which reflect self-worth (core self-evaluations and age) moderate that relationship. We predicted that employees with feelings of high self-worth will expect and will feel entitled to these…

  7. Faculty Organizational Commitment and Citizenship

    Lawrence, Janet; Ott, Molly; Bell, Alli


    Building on a theoretical framework that links characteristics of individuals and their work settings to organizational commitment (OC) and citizenship behavior, this study considers why faculty may be disengaging from institutional service. Analyses of survey data collected from a state system of higher education suggest that job characteristics,…

  8. Higher Education and Social Commitment.

    Nasution, S.; Virasai, Banphot, Eds.

    The proceedings of the Regional Institute of Higher Education and Development's seminar and the meaning and implications of social commitment in higher education are reported. The welcoming address (S. Nasution) and the opening address (Y. B. Dato' Murad bin Mohd. Noor) welcome the participants and set the tone for the discussions to follow. The…

  9. Acceptance and Commitment Therapy: Introduction

    Twohig, Michael P.


    This is the introductory article to a special series in Cognitive and Behavioral Practice on Acceptance and Commitment Therapy (ACT). Instead of each article herein reviewing the basics of ACT, this article contains that review. This article provides a description of where ACT fits within the larger category of cognitive behavior therapy (CBT):…

  10. Committed to the Public Interest?

    Holm Pedersen, Lene


    While politicians are often seen as being motivated by narrow self-interest, this article offers an alternative view. The relationship between two pro-social dimensions – Commitment to the Public Interest (CPI) and User Orientation (UO) – and behavioural outcomes among local councillors is analyzed...

  11. 24-Hour Relativistic Bit Commitment

    Verbanis, Ephanielle; Martin, Anthony; Houlmann, Raphaël; Boso, Gianluca; Bussières, Félix; Zbinden, Hugo


    Bit commitment is a fundamental cryptographic primitive in which a party wishes to commit a secret bit to another party. Perfect security between mistrustful parties is unfortunately impossible to achieve through the asynchronous exchange of classical and quantum messages. Perfect security can nonetheless be achieved if each party splits into two agents exchanging classical information at times and locations satisfying strict relativistic constraints. A relativistic multiround protocol to achieve this was previously proposed and used to implement a 2-millisecond commitment time. Much longer durations were initially thought to be insecure, but recent theoretical progress showed that this is not so. In this Letter, we report on the implementation of a 24-hour bit commitment solely based on timed high-speed optical communication and fast data processing, with all agents located within the city of Geneva. This duration is more than 6 orders of magnitude longer than before, and we argue that it could be extended to one year and allow much more flexibility on the locations of the agents. Our implementation offers a practical and viable solution for use in applications such as digital signatures, secure voting and honesty-preserving auctions.

  12. Acceptance and Commitment Therapy: Introduction

    Twohig, Michael P.


    This is the introductory article to a special series in Cognitive and Behavioral Practice on Acceptance and Commitment Therapy (ACT). Instead of each article herein reviewing the basics of ACT, this article contains that review. This article provides a description of where ACT fits within the larger category of cognitive behavior therapy (CBT):…

  13. Regulatory Foci and Organizational Commitment

    Markovits, Yannis; Ullrich, Johannes; van Dick, Rolf; Davis, Ann J.


    We use regulatory focus theory to derive specific predictions regarding the differential relationships between regulatory focus and commitment. We estimated a structural equation model using a sample of 520 private and public sector employees and found in line with our hypotheses that (a) promotion focus related more strongly to affective…

  14. School Climate and Teacher Commitment

    Smith, Larry Don


    This study examined the relationship between school climate and teacher commitment. The study focused on elementary schools in Northeast Alabama. Thirty-four elementary schools consisting of 522 teachers took part in the study. The teachers completed two survey instruments: the Organizational Climate Index (OCI) and the Organizational Commitment…

  15. Physical Education Teachers' Organizational Commitment

    Demir, Hayri


    The aim of this study was to determine physical education teachers' organizational commitment levels. The sample consisted of 204 physical education teachers working in the city center of Konya in the 2011 to 2012 academic year. The respondents were randomly selected in this research. Data collected for this research by using the Scale for…

  16. Atypical Employment Relationships and Commitment

    Torka, Nicole


    Nowadays, simultaneously maintaining flexible working practices and commitment is an important topic for HR managers since they both can contribute to organisational success. However, many HRM researchers and practitioners are unsure whether these can go together as job security is often seen as a n

  17. The Relationships between Collegiate DECA Commitment, Mentoring and College Students' Perceived Career Commitment

    Duke, Linda


    This study investigated relationships between student's Collegiate DECA commitment, psychological capital, mentoring, and perceived career commitment. Proposed relationships were supported with several psychological theories and frameworks including Organizational Commitment, Psychological Capital, and Social Identity Theory. Data was…

  18. Committed effective doses at various times after intakes of radionuclides

    Phipps, A W; Kendall, G M; Silk, T J; Stather, J W


    This report contains details of committed effective doses at nine times after intake from intakes by ingestion and inhalation of 1 mu 1 AMAD particles by adults. Data are given for various chemical forms of 359 nuclides. It complements NRPB-R245 which describes the changes which have taken place since the last NRPB compendium of dose per unit intake factors (dose coefficients) and gives summary tables. Information on committed equivalent doses to organs is given in NRPB-M288. The information given in these memoranda is also available as a microcomputer package - NRPB-SR245.

  19. Cognitive behavioural therapy in multiple sclerosis: a randomized controlled pilot study of acceptance and commitment therapy.

    Nordin, Linda; Rorsman, Ia


    The aim of this study was to design a trial that could evaluate the effect of acceptance and commitment therapy as a group-intervention for multiple sclerosis patients with psychological distress. Randomized controlled trial with assessment at pretreatment, end of treatment, and at 3-month follow-up. Multiple sclerosis outpatients with elevated symptoms of anxiety and/or depression (n = 21). Patients were randomly assigned to acceptance and commitment therapy or relaxation training. Both treatments consisted of 5 sessions over 15 weeks containing didactic sessions, group discussions, and exercises. Outcome was assessed by self-rated symptoms of anxiety, depression, and a measure of acceptance. At 3-month follow-up, the relaxation training group had a significant decline in anxiety symptoms whereas the acceptance and commitment therapy group showed a maintained improvement in rated acceptance at follow-up. The results reflect the different emphases of the therapies. Acceptance and commitment therapy is aimed at living an active, valued life and increasing acceptance, while relaxation training focuses directly on coping strategies to handle emotional symptoms. The results are preliminary, but supportive of further study of brief group interventions for reducing psychological distress in patients with multiple sclerosis.

  20. Effects of Gender on Engineering Career Commitment

    Barker, Anne M.

    Engineering has been one of the most difficult fields for 'women to enter and in which to succeed. Although the percentage of female engineers has Increased, women are still seriously underrcpresented in the workforce. This study examined the effect offender on career commitment, success, satisfaction, and involvement in engineering, and the effect of personality and work environment on these variables. Alumni from an engineering school in the northeastern United States were surveyed. The questionnaire was analyzed using statistical and descriptive methods to determine relationships among these variables. Women's commitment scores were lower than men's when controlled for other variables, including satisfaction and involvement. Men had longer tenure as engineers than women, even when controlled for year of graduation, professional engineering status, and number of children. Women did not leave engineering in different proportions than men, but they did earn significantly less despite controlling for year of graduation and number of hours worked weekly. Some gender differences in workplace experience were also found, including having colleagues act protectively, being mistaken for secretaries, and seeing men progress faster in their careers than equally qualified women.

  1. How do different types of community commitment influence brand commitment? The mediation of brand attachment.

    Zhang, Ning; Zhou, Zhi-min; Su, Chen-ting; Zhou, Nan


    Although previous research indicates that participation in a brand community may foster consumer loyalty to the brand in question, research has seldom examined the mediating effect of community commitment on brand commitment. Drawing from the typologies of organizational commitment, we divide community commitment into three components: continuance community commitment (continuance CC), affective community commitment (affective CC), and normative community commitment (normative CC). We then assess the mediating role of brand attachment in the relationship between these three components and brand commitment. We test the hypotheses using a sample of online mobile phone brand communities in China. The empirical results reveal that brand attachment exerts an indirect (but not mediated) effect on the relationship between continuance CC and brand commitment and on the relationship between normative CC and brand commitment. We also find that it exerts a partial mediating effect on the relationship between affective CC and brand commitment. The findings contribute to the branding literature and have important implications for brand community management.

  2. Antecedents and Consequences of Affective Commitment

    Bloemer, J.M.M.; Odekerken-Schröder, G.J.


    The primary objective of this study is to assess the impact of three psychological antecedents (position involvement, volitional choice and informational complexity) on affective commitment in a financial service setting. Furthermore, this study addresses the consequences of affective commitment on

  3. Hair Dye and Hair Relaxers

    ... For Consumers Consumer Information by Audience For Women Hair Dye and Hair Relaxers Share Tweet Linkedin Pin it More sharing ... products. If you have a bad reaction to hair dyes and relaxers, you should: Stop using the ...

  4. Social commitment robots and dementia.

    Roger, Kerstin; Guse, Lorna; Mordoch, Elaine; Osterreicher, Angela


    In 2010, approximately 500,000 Canadians suffered from a dementia-related illness. The number of sufferers is estimated to double in about 25 years. Due to this growing demographic, dementia (most frequently caused by Alzheimer's disease) will increasingly have a significant impact on our aging community and their caregivers. Dementia is associated with challenging behaviours such as agitation, wandering, and aggression. Care providers must find innovative strategies that facilitate the quality of life for this population; moreover, such strategies must value the individual person. Social commitment robots - designed specifically with communication and therapeutic purposes - provide one means towards attaining this goal. This paper describes a study in which Paro (a robotic baby harp seal) was used as part of a summer training program for students. Preliminary conclusions suggest that the integration of social commitment robots may be clinically valuable for older, agitated persons living with dementia in long-term care settings.

  5. A brief review on quantum bit commitment

    Almeida, Álvaro J.; Loura, Ricardo; Paunković, Nikola; Silva, Nuno A.; Muga, Nelson J.; Mateus, Paulo; André, Paulo S.; Pinto, Armando N.


    In classical cryptography, the bit commitment scheme is one of the most important primitives. We review the state of the art of bit commitment protocols, emphasizing its main achievements and applications. Next, we present a practical quantum bit commitment scheme, whose security relies on current technological limitations, such as the lack of long-term stable quantum memories. We demonstrate the feasibility of our practical quantum bit commitment protocol and that it can be securely implemented with nowadays technology.

  6. Pragmatic commitments to naturalized epistemology

    Cong Hangqing; Cheng Xiaodong


    This essay explores numerous and complicated naturalized epistemology against the background of pragmatism.We distinguish three programmes of naturalized epistemology:strong,moderate,and weak.By considering commitments of pragmatism on which different programmes depend,we point out the close-knit relationship between pragmatism and naturalized epistemology.We also illustrate the essential origin of today's controversy over naturalized epistemology and predict the uptrend of naturalized epistemology.

  7. The relevance of ontological commitments

    Echenique-Robba, Pablo


    In this introductory note, I describe my particular view of the notion of ontological commitments as honest and pragmatic working hypotheses that assume the existence (out there) of certain entities represented by the symbols in our theory. I argue that this is not naive, in the sense that it does not entail the belief that the hypotheses could ever be proved to be true (or false), but it is nevertheless justified by the success and predictive power of the theory that contains the concepts assumed to exist. I also claim that the ontological commitments one holds (even if tacitly so) have a great influence on what kind of science is produced, how it is used, and how it is understood. Not only I justify this claim, but I also propose a sketch of a possible falsification of it. As a natural conclusion, I defend the importance of identifying, clarifying and making explicit one's ontological commitments if fruitful scientific discussions are to be had. Finally, I compare my point of view with that of some philosop...

  8. The dimensionality of professional commitment

    Jeffrey J. Bagraim


    Full Text Available This paper examines the dimensionality of professional commitment amongst a sample of 240 South African actuaries. Data were obtained, via a mailed questionnaire, from members of the South African Actuarial Society employed in the financial services industry. Statistical analysis conducted on the data showed that the 3-component model first proposed by Meyer, Allen and Smith (1993 is appropriate for understanding professional commitment amongst South African professionals. The analysis also showed that South African actuaries are highly committed to their profession. Opsomming Hierdie artikel ondersoek die dimensionaliteit van professionele toewyding by ‘n steekproef van 240 Suid-Afrikaanse aktuarisse. Die data is verkry deur ‘n posvraelys aan lede van die Suid-Afrikaanse Aktuariële Vereniging wat in die finansiële dienstesektor werksaam was. Statistiese ontledings wat uitgevoer is op die data dui aan dat die driekomponentmodel, aanvanklik voorgestel deur Meyer, Allen en Smith (1993, geskik is om professionele toewyding by Suid-Afrikaanse beroepslui te verstaan. Die ontleding dui verder aan dat Suid-Afrikaanse aktuarisse hoogs toegewyd is aan hulle professie.

  9. Spermatogenesis: The Commitment to Meiosis.

    Griswold, Michael D


    Mammalian spermatogenesis requires a stem cell pool, a period of amplification of cell numbers, the completion of reduction division to haploid cells (meiosis), and the morphological transformation of the haploid cells into spermatozoa (spermiogenesis). The net result of these processes is the production of massive numbers of spermatozoa over the reproductive lifetime of the animal. One study that utilized homogenization-resistant spermatids as the standard determined that human daily sperm production (dsp) was at 45 million per day per testis (60). For each human that means ∼1,000 sperm are produced per second. A key to this level of gamete production is the organization and architecture of the mammalian testes that results in continuous sperm production. The seemingly complex repetitious relationship of cells termed the "cycle of the seminiferous epithelium" is driven by the continuous commitment of undifferentiated spermatogonia to meiosis and the period of time required to form spermatozoa. This commitment termed the A to A1 transition requires the action of retinoic acid (RA) on the undifferentiated spermatogonia or prospermatogonia. In stages VII to IX of the cycle of the seminiferous epithelium, Sertoli cells and germ cells are influenced by pulses of RA. These pulses of RA move along the seminiferous tubules coincident with the spermatogenic wave, presumably undergoing constant synthesis and degradation. The RA pulse then serves as a trigger to commit undifferentiated progenitor cells to the rigidly timed pathway into meiosis and spermatid differentiation.

  10. Kinetic Actviation Relaxation Technique

    Béland, Laurent Karim; El-Mellouhi, Fedwa; Joly, Jean-François; Mousseau, Normand


    We present a detailed description of the kinetic Activation-Relaxation Technique (k-ART), an off-lattice, self-learning kinetic Monte Carlo algorithm with on-the-fly event search. Combining a topological classification for local environments and event generation with ART nouveau, an efficient unbiased sampling method for finding transition states, k-ART can be applied to complex materials with atoms in off-lattice positions or with elastic deformations that cannot be handled with standard KMC approaches. In addition to presenting the various elements of the algorithm, we demonstrate the general character of k-ART by applying the algorithm to three challenging systems: self-defect annihilation in c-Si, self-interstitial diffusion in Fe and structural relaxation in amorphous silicon.

  11. 24 CFR 203.7 - Commitment process.


    ... 24 Housing and Urban Development 2 2010-04-01 2010-04-01 false Commitment process. 203.7 Section 203.7 Housing and Urban Development Regulations Relating to Housing and Urban Development (Continued... Insurance, and Commitments § 203.7 Commitment process. For single family mortgage programs that are...

  12. Commitment among Arab Adolescents in Israel.

    Ben-Ari, Adital Tirosh; Azaiza, Faisal


    Examines 662 Arab adolescents' commitments to their own self-development, family, Arab people, and village along with the order in which these commitments are structured. Reveals that the two prevalent patterns of adolescent commitment, individualistic and collectivistic, demonstrate the adolescents' struggle with these value systems and the…

  13. Organizational and Client Commitment among Contracted Employees

    Coyle-Shapiro, Jacqueline A-M.; Morrow, Paula C.


    This study examines affective commitment to employing and client organizations among long-term contracted employees, a new and growing employment classification. Drawing on organizational commitment and social exchange literatures, we propose two categories of antecedents of employee commitment to client organizations. We tested our hypotheses…

  14. Professionalism as a Form of Work Commitment.

    Morrow, Paula C.; Goetz, Joe F., Jr.


    Evaluated concept of professionalism as a form of work commitment using a modified version of Hall's (1968) multidimensional measure of professionalism on 325 accountants in public practice. Examined three forms of work commitment--job involvement, organizational commitment, and work ethic endorsement--and four professional behaviors. Suggests the…

  15. Nonlinear fractional relaxation

    A Tofighi


    We define a nonlinear model for fractional relaxation phenomena. We use -expansion method to analyse this model. By studying the fundamental solutions of this model we find that when → 0 the model exhibits a fast decay rate and when → ∞ the model exhibits a power-law decay. By analysing the frequency response we find a logarithmic enhancement for the relative ratio of susceptibility.

  16. An empirical investigation on relationship between social capital and organizational commitment

    Ali Alikhani


    Full Text Available This paper presents an empirical investigation to study the relationship between social capital and organizational commitment. The study considers the relationship between social capital with three components of organizational commitment; namely, affective commitment, continuous and normative commitment. The study has been applied among a sample of 292 regular employees who worked for an Iranian bank located in city of Tehran, Iran. The implementation of Pearson correlation has indicated that there were positive and meaningful relationships between social capital and affective commitment (r = 0.197, Sig. = 0.01, continuous (r = 0.308, Sig. = 0.01 and normative commitment (r = 0.423, Sig. = 0.01. In addition, the study has detected that women had more commitment on their organization than men did. The proposed study of this paper has also considered a regression model where organizational commitment is dependent variable and trust and communication are considered as independent variables. According to the results of regression analysis, an increase of one unit in trust and social capital communication will increase organizational commitment by 0.189 and 0.204, respectively.

  17. The impact of selected organizational variables and managerial leadership on radiation therapists' organizational commitment

    Akroyd, Duane [Department of Adult and Community College Education, College of Education, Campus Box 7801, North Carolina State University, Raleigh, NC 27695 (United States)], E-mail:; Legg, Jeff [Department of Radiologic Sciences, Virginia Commonwealth University, Richmond, VA 23284 (United States); Jackowski, Melissa B. [Division of Radiologic Sciences, University of North Carolina School of Medicine 27599 (United States); Adams, Robert D. [Department of Radiation Oncology, University of North Carolina School of Medicine 27599 (United States)


    The purpose of this study was to examine the impact of selected organizational factors and the leadership behavior of supervisors on radiation therapists' commitment to their organizations. The population for this study consists of all full time clinical radiation therapists registered by the American Registry of Radiologic Technologists (ARRT) in the United States. A random sample of 800 radiation therapists was obtained from the ARRT for this study. Questionnaires were mailed to all participants and measured organizational variables; managerial leadership variable and three components of organizational commitment (affective, continuance and normative). It was determined that organizational support, and leadership behavior of supervisors each had a significant and positive affect on normative and affective commitment of radiation therapists and each of the models predicted over 40% of the variance in radiation therapists organizational commitment. This study examined radiation therapists' commitment to their organizations and found that affective (emotional attachment to the organization) and normative (feelings of obligation to the organization) commitments were more important than continuance commitment (awareness of the costs of leaving the organization). This study can help radiation oncology administrators and physicians to understand the values their radiation therapy employees hold that are predictive of their commitment to the organization. A crucial result of the study is the importance of the perceived support of the organization and the leadership skills of managers/supervisors on radiation therapists' commitment to the organization.

  18. 基于混沌群粒子优化−情景约简算法的混合电力系统机组组合模型及其求解%Unit Commitment Model and Solution in the Hybrid Power System Based on Chaos Embedded Particle Swarm Optimization-Scenario Reduction Algorithms



    Large-scale grid-integration of new energy sources such as wind power generation and so on leads to new problems in secure and stable operation of traditional power grids. For a hybrid power grid containing thermal power plants, wind farms and energy storage equipments, by means of constructing a unit commitment model and the stochastic property of wind power output uncertainty is simulated by scenario tree. Leading chaos embedded particle swarm optimization (CEPSO) into scenario reduction algorithms (SRA) the results of stochastic simulation and the ability to search the optimal solution are improved. Taking a hybrid power system composed of a wind farm and a 10-machine system as simulation example, simulation results show that the obtained unit commitment scheme can dispatch as many wind power units as possible and the operational cost of thermal generation units can be reduced to suit to the demand of energy conservation and emission reduction.%  风电等新能源发电机组的大规模并网,对传统电力系统的安全稳定运行带来了新的问题。研究了一种含有风−火−储联合运行的混合电力系统,通过构建机组组合问题模型,利用情景树方法模拟风电出力的不确定性的随机特性,将混沌群粒子优化算法引入情景约简算法,改善随机模拟结果和提高最优解的搜寻能力。算例分析结果表明,得到的机组组合方案能够尽量多调度风电机组,降低火电机组的运行成本,适应节能减排工作需要。

  19. The role of professional and team commitment in nurse-physician collaboration: A dual identity model perspective.

    Caricati, Luca; Guberti, Monica; Borgognoni, Patrizia; Prandi, Carmen; Spaggiari, Ivana; Vezzani, Emanuela; Iemmi, Marina


    Nurse-physician collaboration involves healthcare operators from different professions working together. The dual identity model predicts that nurse-physician interprofessional collaboration could improve if these operators feel they belong to both their professional category and care unit. This study tested this prediction by analyzing the effect of professional and team commitments on interprofessional collaboration between nurses and physicians in a hospital based in Northern Italy. A cross-section questionnaire survey was administered to 270 nurses and 95 physicians. Results indicate that interprofessional collaboration is positively affected by team commitment, while professional commitment had no effect. In accordance with the dual identity model, results indicate that interprofessional collaboration is higher when: (i) both professional and team commitment is high, and (ii) when team commitment is high and professional commitment is low. These results support dual identity model predictions and suggest that interprofessional collaboration can be increased by bolstering both team and professional commitment of nurses and physicians.

  20. Commitment to self-rewards

    Koch, Alexander K.; Nafziger, Julia


    Self-administered rewards are ubiquitous. They serve as incentives for personal accomplish¬ments and are widely recommended as tools for overcoming self-control problems. However, it seems puzzling why self-rewards can work: the prospect of a reward has a motivating force only if the threat of self-denial of the reward after low performance is credible. We explain how a rational forward-looking individual may achieve commitment to self-rewards, by applying Köszegi and Rabin's (2006) model of ...

  1. Our Commitment to Bioenergy Sustainability



    The U.S. Department of Energy’s Bioenergy Technologies Office (BETO) is committed to developing the resources, technologies, and systems needed to support a thriving bioenergy industry that protects natural resources and ad- vances environmental, economic, and social benefits. BETO’s Sustainability Technology Area proactively identifies and addresses issues that affect the scale-up potential, public acceptance, and long-term viability of advanced bioenergy systems; as a result, the area is critical to achieving BETO’s overall goals.

  2. The Query-commit Problem

    Molinaro, Marco


    In the query-commit problem we are given a graph where edges have distinct probabilities of existing. It is possible to query the edges of the graph, and if the queried edge exists then its endpoints are irrevocably matched. The goal is to find a querying strategy which maximizes the expected size of the matching obtained. This stochastic matching setup is motivated by applications in kidney exchanges and online dating. In this paper we address the query-commit problem from both theoretical and experimental perspectives. First, we show that a simple class of edges can be queried without compromising the optimality of the strategy. This property is then used to obtain in polynomial time an optimal querying strategy when the input graph is sparse. Next we turn our attentions to the kidney exchange application, focusing on instances modeled over real data from existing exchange programs. We prove that, as the number of nodes grows, almost every instance admits a strategy which matches almost all nodes. This resu...

  3. Investment and Consumption without Commitment

    Ekeland, Ivar


    In this paper, we investigate the Merton portfolio management problem in the context of non-exponential discounting. This gives rise to time-inconsistency of the decision-maker. If the decision-maker at time t=0 can commit his/her successors, he/she can choose the policy that is optimal from his/her point of view, and constrain the others to abide by it, although they do not see it as optimal for them. If there is no commitment mechanism, one must seek a subgame-perfect equilibrium strategy between the successive decision-makers. In the line of the earlier work by Ekeland and Lazrak we give a precise definition of equilibrium strategies in the context of the portfolio management problem, with finite horizon, we characterize it by a system of partial differential equations, and we show existence in the case when the utility is CRRA and the terminal time T is small. We also investigate the infinite-horizon case and we give two different explicit solutions in the case when the utility is CRRA (in contrast with t...

  4. Grueneisen relaxation photoacoustic microscopy

    Wang, Lidai; Zhang, Chi; Wang, Lihong V.


    The temperature-dependent property of the Grueneisen parameter has been employed in photoacoustic imaging mainly to measure tissue temperature. Here we explore this property using a different approach and develop Grueneisen-relaxation photoacoustic microscopy (GR-PAM), a technique that images non-radiative absorption with confocal optical resolution. GR-PAM sequentially delivers two identical laser pulses with a micro-second-scale time delay. The first laser pulse generates a photoacoustic signal and thermally tags the in-focus absorbers. Owing to the temperature dependence of the Grueneisen parameter, when the second laser pulse excites the tagged absorbers within the thermal relaxation time, a photoacoustic signal stronger than the first one is produced. GR-PAM detects the amplitude difference between the two co-located photoacoustic signals, confocally imaging the non-radiative absorption. We greatly improved axial resolution from 45 µm to 2.3 µm and at the same time slightly improved lateral resolution from 0.63 µm to 0.41 µm. In addition, the optical sectioning capability facilitates the measurement of the absolute absorption coefficient without fluence calibration. PMID:25379919

  5. Sport Commitment and Purchase Intentions of Intercollegiate Boxing Coaches and Participants

    Lamar Reams


    Full Text Available The current study analyzed the sport commitment and purchase intentions of club level intercollegiate boxers and coaches. Participants at United States Intercollegiate Boxing Association (USIBA member institutions (N = 155 completed an online survey answering questions regarding their sport commitment and future equipment purchase intentions. Multivariate analysis discovered significant sport commitment differences among boxers and coaches, Wilk’s Λ = .838, F (7, 125 = 3.46, p <.05; with coaches being slightly more committed (M = 4.56, SD = .56 and personally invested than their boxing counterparts (M = 4.56, SD = .52. For the second research question, an analysis of covariance (using sport commitment as the covariate was conducted to analyze potential differences across coaches and boxers on equipment purchase intentions. No significant differences among boxers and coaches were found, F (1, 92 = .400, p = .529. Discussion within the manuscript includes academic implications and pragmatic recommendations.

  6. An examination of the role of perceived support and employee commitment in employee-customer encounters.

    Vandenberghe, Christian; Bentein, Kathleen; Michon, Richard; Chebat, Jean-Charles; Tremblay, Michel; Fils, Jean-François


    The authors examined the relationships between perceived organizational support, organizational commitment, commitment to customers, and service quality in a fast-food firm. The research design matched customer responses with individual employees' attitudes, making this study a true test of the service provider-customer encounter. On the basis of a sample of matched employee-customer data (N = 133), hierarchical linear modeling analyses revealed that perceived organizational support had both a unit-level and an employee-level effect on 1 dimension of service quality: helping behavior. Contrary to affective organizational commitment, affective commitment to customers enhanced service quality. The 2 sub-dimensions of continuance commitment to the organization--perceived high sacrifice and perceived lack of alternatives--exerted effects opposite in sign: The former fostered service quality, whereas the latter reduced it. The implications of these findings are discussed within the context of research on employee-customer encounters.

  7. Magnetoviscosity and relaxation in ferrofluids



    The increase in viscosity of a ferrofluid due to an applied magnetic field is discussed on the basis of a phenomenological relaxation equation for the magnetization. The relaxation equation was derived earlier from irreversible thermodynamics, and differs from that postulated by Shliomis. The two relaxation equations lead to a different dependence of viscosity on magnetic field, unless the relaxation rates are related in a specific field-dependent way. Both planar Couette flow and Poiseuille pipe flow in parallel and perpendicular magnetic field are discussed. The entropy production for these situations is calculated and related to the magnetoviscosity.

  8. [Death in a relaxation tank].

    Rupp, Wolf; Simon, Karl-Heinz; Bohnert, Michael


    Complete relaxation can be achieved by floating in a darkened, sound-proof relaxation tank filled with salinated water kept at body temperature. Under these conditions, meditation exercises up to self-hypnosis may lead to deep relaxation with physical and mental revitalization. A user manipulated his tank, presumably to completely cut off all optical and acoustic stimuli and accidentally also covered the ventilation hole. The man was found dead in his relaxation tank. The findings suggested lack of oxygen as the cause of death.

  9. Workplace Performance, Worker Commitment and Loyalty

    Brown, Sarah; McHardy, Jolian; McNabb, Robert; Taylor, Karl


    Using matched employer-employee level data drawn from the 2004 UK Workplace and Employee Relations Survey, we explore the determinants of a measure of worker commitment and loyalty (CLI) and whether CLI influences workplace performance. Factors influencing employee commitment and loyalty include age and gender, whilst workplace level characteristics of importance include human resource practices. With respect to the effects of employee commitment and loyalty upon the workplace, higher CLI is ...

  10. Acceptance and Commitment Therapy: Distinctive Features

    Flaxman, Paul E.; Blackledge, J. T.; Bond, Frank W.


    What are the distinctive theoretical and practical features of acceptance and commitment therapy? Acceptance and commitment therapy (ACT) is a modern behaviour therapy that uses acceptance and mindfulness interventions alongside commitment and behaviour change strategies to enhance psychological flexibility. Psychological flexibility refers to the ability to contact the present moment and change or persist in behaviour that serves one’s personally chosen values. Divided into two secti...

  11. Commitment and Trust in Young Adult Friendships

    Jennifer Wieselquist


    Given the importance of maintaining mutuality in interdependent relationships, the goal of the present research was to determine if interpersonal trust serves as a gauge of partners’ commitment within young adults’ close friendships. It was hypothesized that individuals trust their friends to the degree that their friends are committed to their relationship, and that individuals’ perceptions of their friends’ commitment mediates this association. A correlational design was employed and measur...

  12. Relaxing Behavioural Inheritance

    Nuno Amálio


    Full Text Available Object-oriented (OO inheritance allows the definition of families of classes in a hierarchical way. In behavioural inheritance, a strong version, it should be possible to substitute an object of a subclass for an object of its superclass without any observable effect on the system. Behavioural inheritance is related to formal refinement, but, as observed in the literature, the refinement constraints are too restrictive, ruling out many useful OO subclassings. This paper studies behavioural inheritance in the context of ZOO, an object-oriented style for Z. To overcome refinement's restrictions, this paper proposes relaxations to the behavioural inheritance refinement rules. The work is presented for Z, but the results are applicable to any OO language that supports design-by-contract.

  13. Disaggregated Futures and Options Commitments of Traders

    Commodity Futures Trading Commission — The Disaggregated Futures and Options Commitments of Traders dataset provides a breakdown of each week's open interest for agriculture, energy, metals, lumber, and...

  14. Disaggregated Futures-Only Commitments of Traders

    Commodity Futures Trading Commission — The Disaggregated Futures-Only Commitments of Traders dataset provides a breakdown of each week's open interest for agriculture, energy, metals, lumber, and...

  15. Family Commitment and Work Characteristics among Pharmacists

    Paul O. Gubbins


    Full Text Available Factors associated with family commitment among pharmacists in the south central U.S. are explored. In 2010, a cross-sectional mailed self-administered 70 item survey of 363 active licensed pharmacists was conducted. This analysis includes only 269 (74% participants who reported being married. Outcome measures were family commitment (need for family commitment, spouse’s family commitment, work-related characteristics (work challenge, stress, workload, flexibility of work schedule, and job and career satisfaction. Married participants’ mean age was 48 (SD = 18 years; the male to female ratio was 1:1; 73% worked in retail settings and 199 (74% completed the family commitment questions. Females reported a higher need for family commitment than males (p = 0.02 but there was no significant difference in satisfaction with the commitment. Work challenge and work load were significantly associated with higher need for family commitment (p < 0.01, when controlled for age, gender, number of dependents, work status, and practice setting. Higher work challenge was associated with higher career satisfaction. Higher job related stress was associated with lower job satisfaction. High work challenge and work load may negatively impact family function since married pharmacists would need higher family commitment from their counterparts. The impact of work-family interactions on pharmacy career satisfaction should be further investigated.

  16. Revealing ontological commitments by magic.

    Griffiths, Thomas L


    Considering the appeal of different magical transformations exposes some systematic asymmetries. For example, it is more interesting to transform a vase into a rose than a rose into a vase. An experiment in which people judged how interesting they found different magic tricks showed that these asymmetries reflect the direction a transformation moves in an ontological hierarchy: transformations in the direction of animacy and intelligence are favored over the opposite. A second and third experiment demonstrated that judgments of the plausibility of machines that perform the same transformations do not show the same asymmetries, but judgments of the interestingness of such machines do. A formal argument relates this sense of interestingness to evidence for an alternative to our current physical theory, with magic tricks being a particularly pure source of such evidence. These results suggest that people's intuitions about magic tricks can reveal the ontological commitments that underlie human cognition. Copyright © 2014 Elsevier B.V. All rights reserved.

  17. Act 7 Ask for Commitment

    Duane Sparks


    <正>"If you ask for commitment and don’t get it,what you’ll get instead will be either a stall or an objection,"he said."Handling those has always been the toughest part of my job,"Matt admitted."This is the point where every other sales system I know sort of kicks me outside the boundaries of the process and says,‘Here are some gimmicks to fall back on.’How does Action Selling want me to deal with stalls and objections?""To begin with,stop thinking of them as different names for the same thing,"Joe replied."Action Selling says that stalls and objections are two entirely different animals,and they call for A stall means the customer is not quite sold yet but has no

  18. The Factors of Strategic Leadership on Commitment: An Empirical Banking in Indonesia

    Juliansyah Noor


    Full Text Available This research is aimed at obtaining information related to possibility whether organizational commitment is affected by training, organization culture, and ethical practice. The data which had been analyzed by multi regression analysis after all variables had been put into principal factor analysis. In this research employees were chosen as a unit analysis and 120 samples selected randomly.The result of this study shows that organization commitment is positively affected by training, organization culture and ethical practice. Implications of organization commitment might have been effected by training, organization culture and ethical practice as a strategic leadership.

  19. Competition with Variety Seeking and Habitual Consumption: Price Commitment or Quality Commitment?

    Liyang Xiong; Guan Liu; Shi Jiang


    .... With price commitment, firms supply lower quality levels in period 1 and higher quality levels in period 2, while, with quality commitment, firms charge higher prices in period 1 and lower prices in period 2...

  20. Project on Elite Athlete Commitment (PEAK): IV. identification of new candidate commitment sources in the sport commitment model.

    Scanlan, Tara K; Russell, David G; Scanlan, Larry A; Klunchoo, Tatiana J; Chow, Graig M


    Following a thorough review of the current updated Sport Commitment Model, new candidate commitment sources for possible future inclusion in the model are presented. They were derived from data obtained using the Scanlan Collaborative Interview Method. Three elite New Zealand teams participated: amateur All Black rugby players, amateur Silver Fern netball players, and professional All Black rugby players. An inductive content analysis of these players' open-ended descriptions of their sources of commitment identified four unique new candidate commitment sources: Desire to Excel, Team Tradition, Elite Team Membership, and Worthy of Team Membership. A detailed definition of each candidate source is included along with example quotes from participants. Using a mixed-methods approach, these candidate sources provide a basis for future investigations to test their viability and generalizability for possible expansion of the Sport Commitment Model.

  1. Effects of Ethical Climate on Organizational Commitment, Professional Commitment, and Job Satisfaction of Auditor in Malaysia

    Suhaiza Ismail


    The objective of this paper is to investigate the effect of the ethical climate on the organizational commitment, professional commitment and job satisfaction of Malaysian auditors. Using a survey questionnaire comprising instruments about the ethical climate, organizational commitment, professional commitment and job satisfaction, 263 usable responses were received. To achieve the objectives, mean scores, standard deviations, correlations and multiple regressions were performed. The study re...

  2. Magnetic relaxation in anisotropic magnets

    Lindgård, Per-Anker


    The line shape and the kinematic and thermodynamic slowing down of the critical and paramagnetic relaxation in axially anisotropic materials are discussed. Kinematic slowing down occurs only in the longitudinal relaxation function. The thermodynamic slowing down occurs in either the transverse or...

  3. Surgeon commitment to trauma care decreases missed injuries.

    Lin, Yen-Ko; Lin, Chia-Ju; Chan, Hon-Man; Lee, Wei-Che; Chen, Chao-Wen; Lin, Hsing-Lin; Kuo, Liang-Chi; Cheng, Yuan-Chia


    Missed injuries sustain an important issue concerning patient safety and quality of care. The purpose of this study is to examine the effect of surgeon commitment to trauma care on missed injuries. We hypothesised that surgeons committed to the trauma service has less missed injuries than surgeons not committed to the trauma service would have. By retrospective analysis of 976 adult patients admitted to the trauma intensive care unit (ICU) at an urban, university-based trauma centre. Missed injuries were compared between two groups; in group 1 the patients were evaluated and treated by the surgeons who were committed to the trauma service and in group 2 the patients were evaluated and treated by surgeons practicing mainly in other specialties. Patients had significantly lower rates of missed major or life-threatening injuries when treated by group 1 surgeons. Logistic regression model revealed significant factors associated with missed major or life-threatening injuries including ISS and groups in which patients were treated by different group surgeons. Physicians will perform better when they are trained and interested in a specific area than those not trained, or even not having any particular interest in that specific area. Surgeons committed to the trauma service had less missed injuries in severely injured patients, and it is vital to improve patient safety and quality of care for trauma patients. Staff training and education for assessing severely injured patients and creating an open culture with detection and reduction of the potential for error are important and effective strategies in decreasing missed injuries and improving patient safety. Copyright © 2012 Elsevier Ltd. All rights reserved.

  4. Requesting a Commitment to Change: Conditions that Produce Behavioral or Attitudinal Commitment

    Overton, Githa Kanisin; MacVicar, Ronald


    There is a lack of clarity in the conceptualization of "commitment" underlying the commitment to change (CTC) procedure used by organizers of continuing education in the health professions. This article highlights the two distinct conceptualizations of commitment that have emerged in the literature outside health care education and practice. The…

  5. Factors associated with the goal commitment of radiography departments' staff in organizational change

    Groenroos, Eija [Helsinki Metropolia University of Applied Sciences, Degree Programme in Radiography and Radiotherapy, Mannerheimintie 172, 00300 Helsinki (Finland)], E-mail:; Pajukari, Arja [MHS, Hus-Roentgen, PL 809, 00029 Hus (Finland)], E-mail:; Matinheikki-Kokko, Kaija [Helsinki Metropolia University of Applied Sciences, Mannerheimintie 172, 00300 Helsinki (Finland)


    Purpose: The aim of the study is to examine factors associated with the goal commitment of radiography departments' staff. The associations studied are (1) organizational change, (2) work-related factors, (3) psychosocial work environment, and (4) intention to leave. Method: The follow-up study was performed between 2005 and 2007 in co-operation with 10 radiography departments of two Finnish municipalities. In 2005 the response rate was 60% (n = 97/163) and in 2007 it was 49% (n = 73/150). Results: The goal commitment had dropped during the organizational change from 3.96 in 2005 to 3.60 in 2007 (scale 1-5) (p = 0.001). Best predictors for the goal commitment of radiography departments' staff were having children (OR 4.4) and perceiving functional environment clearly (OR 2.6). Correlation between the goal commitment and intention to leave of the staff was -0.32 (p = 0.01). Conclusion: From the viewpoint of the commitment of the radiography departments' staff, the trend of uniting quite independent health care units into larger entities seems not to be beneficial. This study reveals that commitment to one's work unit is most of all a question of stability and job security. This is a fact the leadership of the radiography departments should take into account, appreciate and support to assure the tenure and productivity of their workforce.

  6. Predicting the Social Commitments of College Students.

    Lavelle, Ellen; O'Ryan, Leslie W.


    Investigates the nature of social beliefs and commitments during the college years in relation to developmental orientations as measured by the Dakota Inventory of Student Orientations. Results support Creative-Reflective scale scores as predictive of commitment to the more humanitarian issues such as race and women's rights, whereas…

  7. Analyzing Teaching Commitment: Theoretical and Empirical Dimensions.

    Tyree, Alexander K., Jr.

    Classical commitment studies are either sociologically oriented or based in the psychological empirical research tradition. A review of the literature reveals agreement on the multidimensionality and the contextual complexity of commitment, two principles which guide the hypotheses of the present study. This study uses the Administrator and…

  8. Identity Style, Parental Authority, and Identity Commitment.

    Berzonsky, Michael D.


    The role that parental authority patterns and social-cognitive identity styles may play in establishing identity commitments was investigated. The results indicated that family authority and identity style variables combined accounted for 50% of the variation in strength of identity commitment. As hypothesized, the relationship between parental…

  9. Identity Style, Parental Authority, and Identity Commitment.

    Berzonsky, Michael D.


    The role that parental authority patterns and social-cognitive identity styles may play in establishing identity commitments was investigated. The results indicated that family authority and identity style variables combined accounted for 50% of the variation in strength of identity commitment. As hypothesized, the relationship between parental…

  10. Religious and professional commitment in pastoral ministry

    Schilderman, J.B.A.M.; Felling, A.J.A.


    In this contribution, we clarify the pastoral commitment of Dutch Roman-Catholic pastors by describing it as the interplay of religious and professional commitment, which we analyze both analytically and empirically. Our main research question regards an empirical and theological inquiry into the re

  11. Mentor Commitment in Formal Mentoring Relationships

    Allen, Tammy D.; Eby, Lillian T.


    This research examined the role of mentor commitment relative to protege perceptions of relationship quality within formal mentoring programs. Based on a matched sample of 91 mentors and proteges, the results indicated that mentor commitment related positively to protege reports of relationship quality. This relationship was stronger for male…

  12. The Influence of Culture on Teacher Commitment

    Abd Razak, Nordin; Darmawan, I. Gusti Ngurah; Keeves, John P.


    Culture is believed to be an important factor that influences various aspects of human life, such as behaviour, thinking, perceptions and attitudes. This article examines the similarities and differences in the influence of culture on teacher commitment in three types of Malaysian primary schools. Since commitment to teaching has rarely been…

  13. Education on the Internet: Anonymity vs. Commitment.

    Dreyfus, Hubert L.


    Argues that learning a skill requires the kind of commitment which is undermined by the Press (the Public) and the Internet, citing Soren Kierkegaard's "The Present Age", and states that learning by apprenticeship is impossible in cyberspace. Includes: aesthetic sphere--commitment to the enjoyment of sheer information; ethical…

  14. Sexually Violent Predators and Civil Commitment Laws

    Beyer Kendall, Wanda D.; Cheung, Monit


    This article analyzes the civil commitment models for treating sexually violent predators (SVPs) and analyzes recent civil commitment laws. SVPs are commonly defined as sex offenders who are particularly predatory and repetitive in their sexually violent behavior. Data from policy literature, a survey to all states, and a review of law review…

  15. Decision to commit crime: rational or nonrational

    Glenn D. Walters


    Full Text Available Objective to prove the necessity to take into account the influence of emotions on decision making to describe a combined model of the decision making process which unites rational and irrational components of choice in crime commitment. Methods dialectic systemic historicallegal formaljuridical methods summarization. Results the paper gives a complex analysis of the criminal decisionmaking process and reveals the factors increasing the probability of antisocial actions. The value of the combined cognitiveemotive model is that emotions can give more significant information to the decisionmaker than reasoning. Scientific novelty the author proposes a theory of decision making which says that a person chooses to act or not to act under hedonistic or moral emotions while the irrelevant emotions are increased and the relevant ones are suppressed by cognitive and situational factors serving as a basis for criminal decision making. Practical significance studying the role of emotions in the criminal and noncriminal decision making will significantly contribute to the development of criminology. The research results will be useful for researchers and lawenforcement bodies as well as for all those who are interested in the issues of crime control and prevention.

  16. Optimal Deadline Scheduling with Commitment

    Chen, Shiyao; He, Ting


    We consider an online preemptive scheduling problem where jobs with deadlines arrive sporadically. A commitment requirement is imposed such that the scheduler has to either accept or decline a job immediately upon arrival. The scheduler's decision to accept an arriving job constitutes a contract with the customer; if the accepted job is not completed by its deadline as promised, the scheduler loses the value of the corresponding job and has to pay an additional penalty depending on the amount of unfinished workload. The objective of the online scheduler is to maximize the overall profit, i.e., the total value of the admitted jobs completed before their deadlines less the penalty paid for the admitted jobs that miss their deadlines. We show that the maximum competitive ratio is $3-2\\sqrt{2}$ and propose a simple online algorithm to achieve this competitive ratio. The optimal scheduling includes a threshold admission and a greedy scheduling policies. The proposed algorithm has direct applications to the chargin...

  17. Prosodic form and parsing commitments.

    Watt, S M; Murray, W S


    This paper examines the question of whether there are effects of prosody on the syntactic parsing of temporarily ambiguous sentences containing complement verbs. It reports the results of five experiments employing cross-modal response tasks where the visually presented target word was either an ¿appropriate' or an ¿inappropriate' continuation in terms of the prosodic form of the preceeding auditory sentence fragment. Two experiments employing cross-modal naming only showed indications of sensitivity to syntactic and appropriateness manipulations when coupled with a simultaneous appropriateness judgment task. In contrast, the experiments employing cross-modal lexical decision showed greater sensitivity to syntactic and appropriateness effects. However, while the results from these studies replicated our earlier auditory parsing results and provided support for the suggestion that there are differences in visual and auditory parsing processes and for a ¿constituent-based, ' ¿minimal commitment' type auditory parser, none of the studies demonstrated an effect of prosodic form on the parsing process.

  18. The roles of want to commitment and have to commitment in explaining physical activity behavior.

    Gabriele, Jeanne M; Gill, Diane L; Adams, Claire E


    Several theories and models have been proposed to explain decisions in changing and adopting behavior but few address the intricacies of behavioral maintenance. The current study assesses the utility of the Investment Model, which identifies satisfaction, investments, and involvement alternatives as predictors of commitment and continued behavior, in predicting physical activity behavior. Participants (N = 267) completed questionnaires about physical activity and commitment. Structural equation modeling assessed relationships among 2 types of exercise commitment (want to or enthusiastic commitment, have to or obligatory commitment), 3 commitment determinants (satisfaction, investments, and alternatives), and physical activity (minutes of physical activity, stage of behavior change). Want to commitment, but not have to commitment, was related to stage of exercise behavior change and time spent in physical activity. Satisfaction and investments were positively related to want to commitment; whereas, satisfaction, investments, and alternatives were positively related to have to commitment. The model explained 68% and 23% of the variance in time spent in physical activity and stage of behavior change, respectively. This study provides support for the application of the Investment Model to physical activity and suggests that want to commitment may be important for explaining and predicting sustained physical activity behavior.

  19. Can Black Hole Relax Unitarily?

    Solodukhin, S. N.


    We review the way the BTZ black hole relaxes back to thermal equilibrium after a small perturbation and how it is seen in the boundary (finite volume) CFT. The unitarity requires the relaxation to be quasi-periodic. It is preserved in the CFT but is not obvious in the case of the semiclassical black hole the relaxation of which is driven by complex quasi-normal modes. We discuss two ways of modifying the semiclassical black hole geometry to maintain unitarity: the (fractal) brick wall and the worm-hole modification. In the latter case the entropy comes out correctly as well.

  20. Can Black Hole Relax Unitarily?

    Solodukhin, Sergey N.


    We review the way the BTZ black hole relaxes back to thermal equilibrium after a small perturbation and how it is seen in the boundary (finite volume) CFT. The unitarity requires the relaxation to be quasi-periodic. It is preserved in the CFT but is not obvious in the case of the semiclassical black hole the relaxation of which is driven by complex quasi-normal modes. We discuss two ways of modifying the semiclassical black hole geometry to maintain unitarity: the (fractal) brick wall and the...

  1. Can Black Hole Relax Unitarily?

    Solodukhin, S N


    We review the way the BTZ black hole relaxes back to thermal equilibrium after a small perturbation and how it is seen in the boundary (finite volume) CFT. The unitarity requires the relaxation to be quasi-periodic. It is preserved in the CFT but is not obvious in the case of the semiclassical black hole the relaxation of which is driven by complex quasi-normal modes. We discuss two ways of modifying the semiclassical black hole geometry to maintain unitarity: the (fractal) brick wall and the worm-hole modification. In the latter case the entropy comes out correctly as well.

  2. Meaningful work, work engagement and organisational commitment

    Madelyn Geldenhuys


    Full Text Available Orientation: Meaningful work can yield benefits for organisations and lead to positive work outcomes such as satisfied, engaged and committed employees, individual and organisational fulfilment, productivity, retention and loyalty.Research purpose: The aim of the study was to investigate the relationships amongst psychological meaningfulness, work engagement and organisational commitment and to test for a possible mediation effect of work engagement on the relationship between psychological meaningfulness and organisational commitment.Motivation for the study: Managers have to rethink ways of improving productivity and performance at work, due to the diverse, and in some instances escalating, needs of employees (e.g. financial support to uphold their interest in and enjoyment of working.Research approach, design and method: A quantitative approach was employed to gather the data for the study, utilising a cross-sectional survey design. The sample (n = 415 consisted of working employees from various companies and positions in Gauteng, South Africa.Main findings: The results confirmed a positive relationship between psychological meaningfulness, work engagement and organisational commitment. Further, psychological meaningfulness predicts work engagement, whilst psychological meaningfulness and work engagement predict organisational commitment.Practical/managerial implications: Employers identifying their employees’ commitment patterns and mapping out strategies for enhancing those that are relevant to organisational goals will yield positive work outcomes (e.g. employees who are creative, seek growth or challenges for themselves.Contribution/value-add: This study contributes to the literature through highlighting the impact that meaningful work has on sustaining employee commitment to the organisation.

  3. An Exact Relaxation of Clustering

    Mørup, Morten; Hansen, Lars Kai


    of clustering problems such as the K-means objective and pairwise clustering as well as graph partition problems, e.g., for community detection in complex networks. In particular we show that a relaxation to the simplex can be given for which the extreme solutions are stable hard assignment solutions and vice......Continuous relaxation of hard assignment clustering problems can lead to better solutions than greedy iterative refinement algorithms. However, the validity of existing relaxations is contingent on problem specific fuzzy parameters that quantify the level of similarity between the original...... versa. Based on the new relaxation we derive the SR-clustering algorithm that has the same complexity as traditional greedy iterative refinement algorithms but leading to significantly better partitions of the data. A Matlab implementation of the SR-clustering algorithm is available for download....

  4. The relaxation & stress reduction workbook

    Davis, Martha; Eshelman, Elizabeth Robbins; McKay, Matthew


    "The Relaxation & Stress Reduction Workbook broke new ground when it was first published in 1980, detailing easy, step-by-step techniques for calming the body and mind in an increasingly overstimulated world...

  5. 75 FR 82095 - Purchase of Irrevocable Commitments Before Standard Termination


    ... Doc No: 2010-32827] PENSION BENEFIT GUARANTY CORPORATION Purchase of Irrevocable Commitments Before... taking further regulatory action or providing specific guidance on purchase of irrevocable commitments... a request for public comment on purchase of irrevocable commitments before standard termination...

  6. Relaxation Dynamics in Heme Proteins.

    Scholl, Reinhard Wilhelm

    A protein molecule possesses many conformational substates that are likely arranged in a hierarchy consisting of a number of tiers. A hierarchical organization of conformational substates is expected to give rise to a multitude of nonequilibrium relaxation phenomena. If the temperature is lowered, transitions between substates of higher tiers are frozen out, and relaxation processes characteristic of lower tiers will dominate the observational time scale. This thesis addresses the following questions: (i) What is the energy landscape of a protein? How does the landscape depend on the environment such as pH and viscosity, and how can it be connected to specific structural parts? (ii) What relaxation phenomena can be observed in a protein? Which are protein specific, and which occur in other proteins? How does the environment influence relaxations? (iii) What functional form best describes relaxation functions? (iv) Can we connect the motions to specific structural parts of the protein molecule, and are these motions important for the function of the protein?. To this purpose, relaxation processes after a pressure change are studied in carbonmonoxy (CO) heme proteins (myoglobin-CO, substrate-bound and substrate-free cytochrome P450cam-CO, chloroperoxidase-CO, horseradish peroxidase -CO) between 150 K and 250 K using FTIR spectroscopy to monitor the CO bound to the heme iron. Two types of p -relaxation experiments are performed: p-release (200 to ~eq40 MPa) and p-jump (~eq40 to 200 MPa) experiments. Most of the relaxations fall into one of three groups and are characterized by (i) nonexponential time dependence and non-Arrhenius temperature dependence (FIM1( nu), FIM1(Gamma)); (ii) exponential time dependence and non-Arrhenius temperature dependence (FIM0(A_{i}to A_{j})); exponential time dependence and Arrhenius temperature dependence (FIMX( nu)). The influence of pH is studied in myoglobin-CO and shown to have a strong influence on the substate population of the

  7. Relationship between organizational culture and commitment of employees in health care centers in west of Iran

    Hamidi, Yadollah; Mohammadibakhsh, Roghayeh; Soltanian, Alireza; Behzadifar, Masoud


    Introduction Presence of committed personnel in each organization not only reduces their absenteeism, delays, and displacements but also leads to a dramatic increase in performance and efficiency of an organization, mental freshness of employees, better manifestation of noble objectives, and organizational mission as well as fulfillment of personal goals. Therefore, the purpose of this study was to determine the relationship between organizational culture and organizational commitment of employees in administrative units of health care centers in the cities of Hamedan Province based on the Denison model in 2015. Methods In this cross-sectional study, 177 employees in administrative units of health care centers in the cities of Hamedan Province were selected by a multistage stratified sampling method. The data collection instruments included the standardized Denison organizational culture survey and organizational commitment questionnaire by Meyer and Allen. Data were analyzed by IBM-SPSS version 21 using descriptive statistics and Pearson product-moment coefficient. Results Among the 12 indicators of organizational culture, the highest mean scores were assigned to empowerment (16.74), organizational learning (16.41), vision (16.4), and strategic direction (16.35); respectively. Furthermore, the indicators of capability development (14.2), core values (15.31), team orientation (15.45), and goals (15.46) received the lowest mean scores in this respect. Among the four dimensions of organizational culture, the highest mean score was related to “mission” in organizational culture and the lowest score was associated with “involvement.” Meyer and Allen’s organizational commitment model also had three components in which affective commitment in this study obtained the highest score (26.63) and continuance commitment received the lowest score (24.73). In this study, there was a significant correlation between all the components of organizational culture and

  8. Negative magnetic relaxation in superconductors

    Krasnoperov E.P.


    Full Text Available It was observed that the trapped magnetic moment of HTS tablets or annuli increases in time (negative relaxation if they are not completely magnetized by a pulsed magnetic field. It is shown, in the framework of the Bean critical-state model, that the radial temperature gradient appearing in tablets or annuli during a pulsed field magnetization can explain the negative magnetic relaxation in the superconductor.

  9. The Influence of Transformational Leadership on Job Satisfaction, Organizational Commitment,and Employee Performance

    Marnis Atmojo


    Full Text Available This research has four main objectives; first, to prove and analyze the influence of transformational leadership towards employee job satis faction; Second, to prove and analyze the influence of transformational leadership towards organizational commitment; Third, to prove and analyze the influence of transformationalleadership towards employee performance; Fourth, to prove and analyze the influence of organization commitment towards the employee performance. This research involved 146 members of middle management as our research sample namely Head of Department, Plantation Manager, Plant Manager, Head of Bureau/Division, Head Assistant, Head of Strategic Business Unit (SBU, Chief Engineer and Head of Hospital Service. Structural Equation Modeling (SEM was used to test and analyze relationship among the research variables. Research findings are transformational leadership significantly influences job satisfaction, transformational leadership significantly influences the organization commitment. The job satisfaction is shown to have significant influence on employee performance, and organization commitment significantly influences the employee performance.

  10. The Influence of Transformational Leadership on Job Satisfaction, Organizational Commitment,and Employee Performance

    Marnis Atmojo


    Full Text Available This research has four main objectives; first, to prove and analyze the influence of transformational leadership towards employee job satis faction; Second, to prove and analyze the influence of transformationalleadership towards organizational commitment; Third, to prove and analyze the influence of transformational leadership towards employee performance; Fourth, to prove and analyze the influence of organization commitment towards the employee performance. This research involved 146 members of middle management as our research sample namely Head of Department, Plantation Manager, Plant Manager, Head of Bureau/Division, Head Assistant, Head of Strategic Business Unit (SBU, Chief Engineer and Head of Hospital Service. Structural Equation Modeling (SEM was used to test and analyze relationship among the research variables. Research findings are transformationalleadership significantly influences job satisfaction, transformational leadership significantly influences the organization commitment. The job satisfaction is shown to have significant influence on employee performance, and organization commitment significantly influences the employee performance.

  11. Sensitivity Factor Analysis For Unit Commitment In Loaded Lines

    Lata Chaudhary


    Full Text Available In today’s competitive electricity market, it is not possible to settle all contracted transactions of power because of congestion in transmission lines. Usually, the independent system operator seeks to eliminate congestion by rescheduling output power of the generators. But all generators may not have the same effect (sensitivity on the power flow of the congested lines, so this is not an economical way to reschedule output power of all generators for managing congestion. Therefore, in this paper, active power generator sensitivity factor of the generators to the congested lines have been utilized to ascertain the number of generators participating in congestion management. The effectiveness and feasibility of the proposed algorithm have been tested on IEEE 30 bus system

  12. Solving unit commitment and economic load dispatch problems ...

    solution. The IEEE 30 bus system is used to test the demonstration of the solution ... problem such as Genetic Algorithm (GA), Particle Swarm Optimization (PSO), ... representation. where σ , δ , τ is the hot startup cost, the cold startup cost and ...

  13. Organisational commitment and responses to planned ...

    12Key words: organisational change, organisational commitment, personal valence, organisational .... and acceptance of the goals and values of the organisation, a willingness to put in ...... Cognitive Therapy and Research, 1(4): 287–310.

  14. Commitment and Trust in Young Adult Friendships

    Jennifer Wieselquist


    Full Text Available Given the importance of maintaining mutuality in interdependent relationships, the goal of the present research was to determine if interpersonal trust serves as a gauge of partners’ commitment within young adults’ close friendships. It was hypothesized that individuals trust their friends to the degree that their friends are committed to their relationship, and that individuals’ perceptions of their friends’ commitment mediates this association. A correlational design was employed and measures were obtained from both members of 60 same-sex friendship dyads. A multilevel modeling approach was used to perform a mediational analysis of model variables; the hypotheses were confirmed. Furthermore, it was revealed that friends demonstrate a moderate degree of mutual commitment in their relationships. Potential avenues for future research regarding the development and consequences of trust in close friendships are discussed.

  15. Green Supplier Network Manufacturer Commitment Form

    Online form expressing interest in committing to be a Green Supplier; this form expresses your intent to participate in a confidential Green Suppliers Network assessment, implement recommended environmental improvements and complete a NIST MEP follow-up.

  16. The Braid-Based Bit Commitment Protocol

    WANG Li-cheng; CAO Zhen-fu; CAO Feng; QIAN Hai-feng


    With recent advances of quantum computation, new threats have closed in upon to the classical public key cryptosystems. In order to build more secure bit commitment schemes, this paper gave a survey of the new coming braid-based cryptography and then brought forward the first braid-based bit commitment protocol. The security proof manifests that the proposed protocol is computationally binding and information-theoretically hiding.Furthermore, the proposed protocol is also invulnerable to currently known quantum attacks.

  17. Commitment escalation to a failing family business

    Chirico, Francesco; Salvato, Carlo; Byrne, Barbara; Akhter, Naveed; Arriaga Múzquiz, Juan


    The overarching intent of this manuscript is to heighten awareness to the concept of commitment escalation as it bears on a failing family business. Specifically, drawing on the concept of emotional ownership, together with self-justification arguments, we a) identify factors considered to be most forceful in contributing to the presence of commitment escalation and thus, resistance to change in a failing family business (i.e., emotional ownership, feeling of responsibility, investment of cap...

  18. COMMITMENT A Psychological Tie and Moral Value


    Notes on the Concept of Commitment,” American Journal of Sociology 66, no. 1 (1960): 32-40. JSTOR ( Journal of Sociology LXI (January, 1956): 289-98. - Thomas C. Schelling, "An Essay on Bargaining," American Economic Review XLVI (June... Sociology 66, no. 1 (1960): 32-40. - B. Buchannan, “Building Organizational Commitment: The Socialization of Mangers in Work Organizations

  19. Linking transformational leadership and organisation commitment

    Rua, Orlando Manuel Lima; Araújo, João


    The main goal of this paper is to analyse the impacts of transformational leadership on organisational commitment. To this effect we developed a case study following a quantitative methodological approach. The research was conducted at the Serralves Foundation (Porto, Portugal) to empirically test the proposed research model and its hypothesis. The empirical results confirm that transformational leadership are not significantly influenced by commitment. As the main limitation of this...

  20. Relaxation to the Invariant Density for Kicked Rotor

    Khodas, M A


    The relaxation rates to the invariant density in the chaotic phase space component of the kicked rotor (standard map) are calculated analytically for a large stochasticity parameter, K. For hyperbolic systems these are the logarithms of the poles of the matrix elements of the resolvent $ These poles are inside the unit circle. For hyperbolic systems it is a rigorous result, while very little is known about mixed systems such as the kicked rotor, that is studied in this work. Here the relaxation rates are calculated in presence of noise, in powers of $1/\\sqrt{K}$, then the limit of vanishing noise is taken and the rates are found to be non vanishing, corresponding to poles inside the unit circle. It is found that the slow relaxation rates reduce to the ones found for diffusion in the momentum direction. The fast relaxation modes are related to relaxation of inhomogeneities in the angle direction. The analytical results are compared with numerical simulations, and small deviations from the analytical formulas r...

  1. Increasing Medical Practice Team Commitment: Twenty-Five Strategies.

    Hills, Laura


    Employee commitment is one of the most important principles of practice man- agement. Yet commitment is delicate; it must be carefully earned, and it can easily deteriorate. This article explores practical strategies the medical practice manager can use to assess, foster, and increase employee commitment. It de- fines commitment and how commitment is manifested in employee attitudes and behavior. It provides a 10-question guide medical practice managers can use to assess employee commitment, and a four-part roadmap that will inspire commitment through leadership. This article also offers 25 hands-on strate- gies to increase employee commitment, and more than a dozen questions to guide difficult conversations with employees when their commitment level to the medical practice is low or unclear. Finally, this article suggest four drivers of employee commitment and a five-part strategy medical practice managers can use to model commitment through their own leadership.

  2. Generalized extended Navier-Stokes theory: Multiscale spin relaxation in molecular fluids

    Hansen, Jesper Schmidt


    This paper studies the relaxation of the molecular spin angular velocity in the framework of generalized extended Navier-Stokes theory. Using molecular dynamics simulations, it is shown that for uncharged diatomic molecules the relaxation time decreases with increasing molecular moment of inertia...... per unit mass. In the regime of large moment of inertia the fast relaxation is wave-vector independent and dominated by the coupling between spin and the fluid streaming velocity, whereas for small inertia the relaxation is slow and spin diffusion plays a significant role. The fast wave...

  3. Dynamical theory of spin relaxation

    Field, Timothy R.; Bain, Alex D.


    The dynamics of a spin system is usually calculated using the density matrix. However, the usual formulation in terms of the density matrix predicts that the signal will decay to zero, and does not address the issue of individual spin dynamics. Using stochastic calculus, we develop a dynamical theory of spin relaxation, the origins of which lie in the component spin fluctuations. This entails consideration of random pure states for individual protons, and how these pure states are correctly combined when the density matrix is formulated. Both the lattice and the spins are treated quantum mechanically. Such treatment incorporates both the processes of spin-spin and (finite temperature) spin-lattice relaxation. Our results reveal the intimate connections between spin noise and conventional spin relaxation.

  4. A mixed relaxed clock model


    Over recent years, several alternative relaxed clock models have been proposed in the context of Bayesian dating. These models fall in two distinct categories: uncorrelated and autocorrelated across branches. The choice between these two classes of relaxed clocks is still an open question. More fundamentally, the true process of rate variation may have both long-term trends and short-term fluctuations, suggesting that more sophisticated clock models unfolding over multiple time scales should ultimately be developed. Here, a mixed relaxed clock model is introduced, which can be mechanistically interpreted as a rate variation process undergoing short-term fluctuations on the top of Brownian long-term trends. Statistically, this mixed clock represents an alternative solution to the problem of choosing between autocorrelated and uncorrelated relaxed clocks, by proposing instead to combine their respective merits. Fitting this model on a dataset of 105 placental mammals, using both node-dating and tip-dating approaches, suggests that the two pure clocks, Brownian and white noise, are rejected in favour of a mixed model with approximately equal contributions for its uncorrelated and autocorrelated components. The tip-dating analysis is particularly sensitive to the choice of the relaxed clock model. In this context, the classical pure Brownian relaxed clock appears to be overly rigid, leading to biases in divergence time estimation. By contrast, the use of a mixed clock leads to more recent and more reasonable estimates for the crown ages of placental orders and superorders. Altogether, the mixed clock introduced here represents a first step towards empirically more adequate models of the patterns of rate variation across phylogenetic trees. This article is part of the themed issue ‘Dating species divergences using rocks and clocks’. PMID:27325829

  5. Antecedents and Outcomes of Organisational Commitment among Malaysian Engineers

    Rajendran Muthuveloo; Raduan C. Rose


    This study explores the major factors contributing to organizational commitment among engineers in Malaysia. It identifies the effects of certain antecedents on organizational commitment and evaluates the impact of organizational commitment to organizational outcomes. From the literature review, a theoretical foundation for the study was compiled and two hypotheses were established. Firstly, positive employee perception leads to higher organizational commitment. Secondly, higher organizationa...

  6. Sustaining Teacher Commitment: The Role of Professional Communities.

    Hausman, Charles S.; Goldring, Ellen B.


    Surveyed elementary teachers in magnet and non-magnet schools regarding: level of commitment, whether choosing to teach in a school created more commitment than being assigned, and indicators of professionalism related to commitment. Forming a community of learners significantly enhanced teacher commitment. In all situations, teachers who felt a…


    IGA Prima Dewi AP


    Full Text Available Aromatherapy is a kind of treatment that used aroma with aromatherapy essential oil. Extraction process from essential oil generally doing in three methods, there are distilling with water (boiled, distilling with water and steam, and distilling with steam. One of the most favorite aroma is lavender. The main content from lavender is linalyl acetate and linalool (C10H18O. Linalool is main active contents in lavender which can use for anti-anxiety (relaxation. Based on some research, the conclusion indicates that essential oil from lavender can give relaxation (carminative, sedative, reduce anxiety level and increasing mood.

  8. Statistical mechanics of violent relaxation

    Spergel, David N.; Hernquist, Lars


    We propose a functional that is extremized through violent relaxation. It is based on the Ansatz that the wave-particle scattering during violent dynamical processes can be approximated as a sequence of discrete scattering events that occur near a particle's perigalacticon. This functional has an extremum whose structure closely resembles that of spheroidal stellar systems such as elliptical galaxies. The results described here, therefore, provide a simple framework for understanding the physical nature of violent relaxation and support the view that galaxies are structured in accord with fundamental statistical principles.

  9. Active optomechanics through relaxation oscillations

    Princepe, Debora; Frateschi, Newton


    We propose an optomechanical laser based on III-V compounds which exhibits self-pulsation in the presence of a dissipative optomechanical coupling. In such a laser cavity, radiation pressure drives the mechanical degree of freedom and its back-action is caused by the mechanical modulation of the cavity loss rate. Our numerical analysis shows that even in a wideband gain material, such dissipative coupling couples the mechanical oscillation with the laser relaxation oscillations process. Laser self-pulsation is observed for mechanical frequencies below the laser relaxation oscillation frequency under sufficiently high optomechanical coupling factor.

  10. Thermal relaxation and mechanical relaxation of rice gel

    丁玉琴; 赵思明; 熊善柏


    Rice gel was prepared by simulating the production processes of Chinese local rice noodles,and the properties of thermal relaxation and mechanical relaxation during gelatinization were studied by differential scanning calorimetry(DSC) measurement and dynamic rheometer.The results show that during gelatinization,the molecular chains of rice starch undergo the thermal relaxation and mechanical relaxation.During the first heating and high temperature holding processes,the starch crystallites in the rice slurry melt,and the polymer chains stretch and interact,then viscoelastic gel forms.The cooling and low temperatures holding processes result in reinforced networks and decrease the viscoelasticity of the gel.During the second heating,the remaining starch crystallites further melt,the network is reinforced,and the viscoelasticity increases.The viscoelasticity,the molecular conformation and texture of the gel are adjusted by changing the temperature,and finally construct the gel with the textural characteristics of Chinese local rice noodle.

  11. How high-commitment HRM relates to engagement and commitment: the moderating role of task proficiency

    Boon, C.; Kalshoven, K.


    In a multisource field study, we examine the relationship between employee perceptions of high-commitment human resource management (HRM), task proficiency, work engagement, and organizational commitment. Based on conservation of resources (COR) theory, we first propose that work engagement mediates

  12. Romantic Relationship Commitment and Its Linkages with Commitment to Parents and Friends during Adolescence

    De Goede, Irene H. A.; Branje, Susan; van Duin, Jet; VanderValk, Inge E.; Meeus, Wim


    This five-wave longitudinal study examines linkages between adolescents' perceptions of romantic relationship commitment and the development of adolescents' perceptions of commitment to parents and friends. A total of 218 early-to-middle adolescents (39.0 percent boys) and 185 middle-to-late adolescents (30.8 percent boys) participated.…

  13. Influence of Teacher Empowerment on Teachers' Organizational Commitment, Professional Commitment and Organizational Citizenship Behavior in Schools

    Bogler, Ronit; Somech, Anit


    The present study focuses on the relationship between teacher empowerment and teachers' organizational commitment, professional commitment (PC) and organizational citizenship behavior (OCB). It examines which subscales of teacher empowerment can best predict these outcomes. The data were collected through a questionnaire returned by a sample of…

  14. A modal approach to intentions, commitments and obligations: Intention plus commitment yields obligation

    Wieringa, R.; Dignum, F.P.M.; Meyer, J-J.Ch.; Kuiper, R.


    In this paper we introduce some new operators that make it possible to reason about decisions and commitments to do actions. In our framework, a decision leads to an intention to do an action. The decision in itself does not change the state of the world; a commitment to actually perform the intende

  15. Perceived Sacrifice and Few Alternatives Commitments: The Motivational Underpinnings of Continuance Commitment's Subdimensions

    Vandenberghe, Christian; Panaccio, Alexandra


    Using work on self-concepts and Conservation of Resources theory, the present research examined the motivational underpinnings of continuance commitment's subcomponents of perceived sacrifice and few alternatives. Study 1 (N=208) found job scope to be positively related to perceived sacrifice commitment, and negatively related to few alternatives…

  16. Organizational identification and commitment: correlates of sense of belonging and affective commitment.

    Dávila, Ma Celeste; Jiménez García, Gemma


    The general purpose of this work is to analyze the overlap between organizational identification and commitment. Specifically, our study focuses on the analysis of the differences and similarities between sense of belonging (a dimension of organizational identification) and affective commitment (a dimension of organizational commitment). In order to do this, we analyzed their discriminant validity and raised their relationship with variables that previous research had showed like precedent and subsequent variables of them: value congruence, perceived support, organizational citizenship behavior, and intention to continue in the organization. A total of 292 people at one organization completed surveys measuring the variables previously described. The results showed that sense of belonging and affective commitment are different concepts and they have different relationships with relation to precedent and subsequent variables. Affective commitment seems to be more useful than sense of belonging to predict organizational citizenship behavior aimed at the organization and intention to continue. Some practical implications are described.

  17. Delivery Commitments in Stochastic Service Networks: Case of Automobile Service

    Sandeep Dulluri; Ganesh Muthusamy


    Service firms have become highly competitive in terms of providing the delivery. The delivery quality in terms of delivery commitments. Delivery commitments impact the customer in deciding for the service. Computing the delivery commitments in stochastic service systems is a real challenge. Delivery commitment forms a key parameter in formulating the service level agreements in B2B markets. In our current work we propose a queuing theoretic approach for computing the delivery commitments. The...

  18. Delivery Commitments in Stochastic Service Networks: Case of Automobile Service

    Sandeep Dulluri; Ganesh Muthusamy


    Service firms have become highly competitive in terms of providing the delivery. The delivery quality in terms of delivery commitments. Delivery commitments impact the customer in deciding for the service. Computing the delivery commitments in stochastic service systems is a real challenge. Delivery commitment forms a key parameter in formulating the service level agreements in B2B markets. In our current work we propose a queuing theoretic approach for computing the delivery commitments. The...

  19. Policy Uncertainty, Investment and Commitment Periods



    Today's investment decisions in key sectors such as energy, forestry or transport have significant impacts on the levels of greenhouse gas (GHG) emissions over the coming decades. Given the economic and environmental long-term implications of capital investment and retirement, a climate mitigation regime should aim to encourage capital investment in climate-friendly technologies. Many factors affect technology choice and the timing of investment, including investor expectations about future prices and policies. Recent international discussions have focused on the importance of providing more certainty about future climate policy stringency. The design of commitment periods can play a role in creating this environment. This paper assesses how the length of commitment periods influences policy uncertainty and investment decisions. In particular, the paper analyses the relationship between commitment period length and near term investment decisions in climate friendly technology.

  20. Optimism as modifier of escalation of commitment.

    Juliusson, Asgeir


    To study whether optimism-pessimism modifies escalation of commitment, 52 undergraduates were told that they had made an unsuccessful investment, then they chose to continue or discontinue this investment. Optimism about future returns was induced in one group by varying the probability of a successful outcome from an initial low to medium, pessimism was induced in another group by varying this probability from an initial high to medium. Supporting the assumption of the manipulation, the results showed that optimistic participants preferred to continue investments whereas pessimistic participants preferred not to. As predicted, when the sunk cost increased, optimism led to escalation of commitment, whereas pessimism led to de-escalation of commitment. These effects were strengthened when probability of a successful outcome was ambiguous.

  1. Contractor and Government: Teamwork and Commitment

    Griffin, Gerald D.


    The assigned topic, "Contractor and Government: Teamwork and Commitment," is a subject about vitally interested. The successes of the U.S. space program were built on such teamwork and commitment. It seems only a short time ago that man's role in space was an unknown quantity. In rapid succession, however, the flights of Shepard, Glenn, and Armstrong demonstrated man's capability to live and travel in space. Consequently, we no longer live with the same awe of space. The success of these joint industry-NASA efforts in achieving our Nation's space goals testifies to the validity of our team's past commitment, management expertise, communications techniques, and teamwork over a period of 25 years. Today, however, We are at the beginning of a new era in space.

  2. Bayer MaterialScience Is Committed to PC Market in China

    Lily Wang


    @@ Bayer MaterialScience' Business Unit Polycarbonates is firmly committed to its customers in China and the wider Asia Pacific region. On May 22nd, at the Chinaplas 2007 exhibition in Guangzhou, Bayer MaterialScience announced further steps of its strategy aimed at improving its responsiveness to customer needs.

  3. Dielectric relaxation of samarium aluminate

    Sakhya, Anup Pradhan; Dutta, Alo; Sinha, T.P. [Bose Institute, Department of Physics, Kolkata (India)


    A ceramic SmAlO{sub 3} (SAO) sample is synthesized by the solid-state reaction technique. The Rietveld refinement of the X-ray diffraction pattern has been done to find the crystal symmetry of the sample at room temperature. An impedance spectroscopy study of the sample has been performed in the frequency range from 50 Hz to 1 MHz and in the temperature range from 313 K to 573 K. Dielectric relaxation peaks are observed in the imaginary parts of the spectra. The Cole-Cole model is used to analyze the dielectric relaxation mechanism in SAO. The temperature-dependent relaxation times are found to obey the Arrhenius law having an activation energy of 0.29 eV, which indicates that polaron hopping is responsible for conduction or dielectric relaxation in this material. The complex impedance plane plot of the sample indicates the presence of both grain and grain-boundary effects and is analyzed by an electrical equivalent circuit consisting of a resistance and a constant-phase element. The frequency-dependent conductivity spectra follow a double-power law due to the presence of two plateaus. (orig.)

  4. Choosing a skeletal muscle relaxant.

    See, Sharon; Ginzburg, Regina


    Skeletal muscle relaxants are widely used in treating musculoskeletal conditions. However, evidence of their effectiveness consists mainly of studies with poor methodologic design. In addition, these drugs have not been proven to be superior to acetaminophen or nonsteroidal anti-inflammatory drugs for low back pain. Systematic reviews and meta-analyses support using skeletal muscle relaxants for short-term relief of acute low back pain when nonsteroidal anti-inflammatory drugs or acetaminophen are not effective or tolerated. Comparison studies have not shown one skeletal muscle relaxant to be superior to another. Cyclobenzaprine is the most heavily studied and has been shown to be effective for various musculoskeletal conditions. The sedative properties of tizanidine and cyclobenzaprine may benefit patients with insomnia caused by severe muscle spasms. Methocarbamol and metaxalone are less sedating, although effectiveness evidence is limited. Adverse effects, particularly dizziness and drowsiness, are consistently reported with all skeletal muscle relaxants. The potential adverse effects should be communicated clearly to the patient. Because of limited comparable effectiveness data, choice of agent should be based on side-effect profile, patient preference, abuse potential, and possible drug interactions.

  5. Onsager relaxation of toroidal plasmas

    Samain, A.; Nguyen, F.


    The slow relaxation of isolated toroidal plasmas towards their thermodynamical equilibrium is studied in an Onsager framework based on the entropy metric. The basic tool is a variational principle, equivalent to the kinetic equation, involving the profiles of density, temperature, electric potential, electric current. New minimization procedures are proposed to obtain entropy and entropy production rate functionals. (author). 36 refs.

  6. Relaxation properties in classical diamagnetism

    Carati, A.; Benfenati, F.; Galgani, L.


    It is an old result of Bohr that, according to classical statistical mechanics, at equilibrium a system of electrons in a static magnetic field presents no magnetization. Thus a magnetization can occur only in an out of equilibrium state, such as that produced through the Foucault currents when a magnetic field is switched on. It was suggested by Bohr that, after the establishment of such a nonequilibrium state, the system of electrons would quickly relax back to equilibrium. In the present paper, we study numerically the relaxation to equilibrium in a modified Bohr model, which is mathematically equivalent to a billiard with obstacles, immersed in a magnetic field that is adiabatically switched on. We show that it is not guaranteed that equilibrium is attained within the typical time scales of microscopic dynamics. Depending on the values of the parameters, one has a relaxation either to equilibrium or to a diamagnetic (presumably metastable) state. The analogy with the relaxation properties in the Fermi Pasta Ulam problem is also pointed out.

  7. Managing Consistency Anomalies in Distributed Integrated Databases with Relaxed ACID Properties

    Frank, Lars; Ulslev Pedersen, Rasmus


    In central databases the consistency of data is normally implemented by using the ACID (Atomicity, Consistency, Isolation and Durability) properties of a DBMS (Data Base Management System). This is not possible if distributed and/or mobile databases are involved and the availability of data also...... has to be optimized. Therefore, we will in this paper use so called relaxed ACID properties across different locations. The objective of designing relaxed ACID properties across different database locations is that the users can trust the data they use even if the distributed database temporarily...... been committed and completed, the execution has the consistency property. The above definition of the consistency property is not useful in distributed databases with relaxed ACID properties because such a database is almost always inconsistent. In the following, we will use the concept Consistency...

  8. Intelligence, democracy, and international environmental commitment.

    Obydenkova, Anastassia; Salahodjaev, Raufhon


    This paper investigates the determinants of nations' commitment to environmental protection at the international level by focusing on the role of national intelligence and the level of democracy. The national intelligence is measured by nation's IQ scores. The findings based on a sample of 152 nations provide strong evidence that intelligence has statistically significant impact on ratification of international environmental agreements, and the countries with IQ 10-points above global average are 23% more likely to sign multilateral environmental agreements than others. The findings also demonstrate that it is the combination of high-level of intelligence of nations and democracy, that likely result in international environmental commitments.

  9. Type A behavior pattern and escalating commitment.

    Schaubroeck, J; Williams, S


    Subjects (N = 98) were randomly assigned to high- and low-responsibility conditions in a commitment-escalation experiment. Global Type A behavior pattern and the underlying dimension of achievement strivings were positively related to the desire to continue the same course of action in the high prior-responsibility condition but not in the low prior-responsibility condition. These findings are discussed in terms of future research into the judgment processes of people with Type A personality and the possible role of escalating commitment in disorders experienced by people with Type A personality.

  10. Evolution of mitigation commitments. Some key issues

    Philibert, C.; Pershing, J. [LTO/EED, International Energy Agency IEA, Paris (France); Morlot, J.C.; Willems, S. [Global and Structural Policies Division, Environment Directorate, Organisation for Economic Co-operation and Development OECD, Paris (France)


    This paper considers the challenges facing climate change policy makers from different perspectives. In so doing, it reviews some of the decision criteria that might guide policy decisions, as well as practical options on the form that different mitigation commitments might take. Taking a broad, longer-term view of the climate problem provides insights on what criteria might be used to eventually shape decisions about future commitments. The paper draws from previous IEA and OECD papers, from information presented and discussions in previous Annex I Expert Group meetings and from other sources in the open literature.

  11. Occupational stress, relaxation therapies, exercise and biofeedback.

    Stein, Franklin


    Occupational stress is a widespread occurrence in the United States. It is a contributing factor to absenteeism, disease, injury and lowered productivity. In general stress management programs in the work place that include relaxation therapies, exercise, and biofeedback have been shown to reduce the physiological symptoms such as hypertension, and increase job satisfaction and job performance. Strategies to implement a successful stress management program include incorporating the coping activities into one's daily schedule, monitoring one's symptoms and stressors, and being realistic in setting up a schedule that is relevant and attainable. A short form of meditation, daily exercise program and the use of heart rate or thermal biofeedback can be helpful to a worker experiencing occupational stress.

  12. Equivalent Relaxations of Optimal Power Flow

    Bose, S; Low, SH; Teeraratkul, T; Hassibi, B


    Several convex relaxations of the optimal power flow (OPF) problem have recently been developed using both bus injection models and branch flow models. In this paper, we prove relations among three convex relaxations: a semidefinite relaxation that computes a full matrix, a chordal relaxation based on a chordal extension of the network graph, and a second-order cone relaxation that computes the smallest partial matrix. We prove a bijection between the feasible sets of the OPF in the bus injection model and the branch flow model, establishing the equivalence of these two models and their second-order cone relaxations. Our results imply that, for radial networks, all these relaxations are equivalent and one should always solve the second-order cone relaxation. For mesh networks, the semidefinite relaxation and the chordal relaxation are equally tight and both are strictly tighter than the second-order cone relaxation. Therefore, for mesh networks, one should either solve the chordal relaxation or the SOCP relaxation, trading off tightness and the required computational effort. Simulations are used to illustrate these results.

  13. Validating Teacher Commitment Scale Using a Malaysian Sample

    Lei Mee Thien


    Full Text Available This study attempts to validate an integrative Teacher Commitment scale using rigorous scale validation procedures. An adapted questionnaire with 17 items was administered to 600 primary school teachers in Penang, Malaysia. Data were analyzed using exploratory factor analysis (EFA and confirmatory factor analysis (CFA with SPSS 19.0 and AMOS 19.0, respectively. The results support Teacher Commitment as a multidimensional construct with its four underlying dimensions: Commitment to Student, Commitment to Teaching, Commitment to School, and Commitment to Profession. A validated Teacher Commitment scale with 13 items measured can be proposed to be used as an evaluative tool to assess the level to which teachers are committed to their students’ learning, teaching, school, and profession. The Teacher Commitment scale would also facilitate the identifications of factors that influence teachers’ quality of work life and school effectiveness. The practical implications, school cultural influence, and methodological limitations are discussed.

  14. Building commitment in a sports class

    Olesen, Jesper; Nielsen, Jens Christian

    is not something you have, or are, but something you do, and commitment is not an individual property but a relationship in which athletes relate to talent developers to become talents. If that is so talent development may not be as much about spotting and selecting as about forging relationships and building...

  15. Organizational Commitment through Organizational Socialization Tactics

    Filstad, Cathrine


    Purpose: The aim of this paper is to investigate how organizational socialization tactics affect newcomers' organizational commitment and learning processes. Design/methodology/approach: A survey was conducted using a measurement tool based on Van Maanen and Schein's theory on organizational socialization tactics and Kuvaas' measurement tools of…

  16. Influencing Organizational Commitment through Office Redesign

    Morrow, Paula C.; McElroy, James C.; Scheibe, Kevin P.


    Prior research on the effects of office redesign on work-related outcomes has been largely a theoretical and yielded mixed and conflicting findings. Expanding on individual reactions to office design changes as specified by social interference theory, we propose that office redesign affects organizational commitment and this relationship is…

  17. Sex, Love, and the Committed Relationship

    Whitaker, Carl A.; And Others


    Six responses are presented to the question of relationship of love, sex, and commitment as revised by Sager in the Spring 1976 issue of this journal. Theoretical and historical perspectives as well as issues of coupling, eroticism, sexual dysfunction and therapy, and psychosexual development are discussed. (HLM)

  18. Planning and commitment in cultural heritage projects

    Baarveld, Marlijn; Smit, Marnix; Dewulf, Geert P.M.R.


    Purpose – The purpose of the study is to generate insights into the planning process for reusing cultural heritage within urban redevelopment projects and identifies barriers to and drivers for stakeholder commitment. Design/methodology/approach – Characteristics of five Dutch urban redevelopment

  19. Sport commitment in adolescent soccer players

    Noelia Belando Pedreño


    Full Text Available The aim of this study was to contribute to the postulates of the self-determination theory, the hierarchical model of intrinsic and extrinsic motivation by Vallerand, and social goals. A structural regression model was estimated to analyze the relations between social goals (responsibility and relationships, praise for autonomous behavior, satisfaction of the basic psychological needs and intrinsic motivation in commitment to sport. A sample of 264 young Spanish soccer players aged between 14 and 16 (M =14.74, SD =.77 participated in the study. Structural Equation Modeling results showed that the social responsibility goal, the social relationship goal and praise for autonomous behavior predicted perceived competence. Furthermore, the relationship goal also predicted the need for relatedness. Satisfaction of the basic psychological needs for competence and relatedness predicted intrinsic motivation. Intrinsic motivation positively predicted future commitment to sport. These results highlighted the importance of social goals, praise for autonomous behavior and psychological mediators in encouraging greater commitment in young soccer players. Future research should focus on the coach’s role in generating greater commitment to sport through the development of intervention methodologies based on social goals.

  20. Evolution of collective commitment during teamwork

    Dunin-Keplicz, B; Verbrugge, R


    In this paper we aim to describe dynamic aspects of social and collective attitudes in teams of agents involved in Cooperative Problem Solving (CPS). Particular attention is given to the strongest motivational attitude, collective commitment, and its evolution during team action. First, building on

  1. Evolution of collective commitment during teamwork

    Dunin-Keplicz, B; Verbrugge, R

    In this paper we aim to describe dynamic aspects of social and collective attitudes in teams of agents involved in Cooperative Problem Solving (CPS). Particular attention is given to the strongest motivational attitude, collective commitment, and its evolution during team action. First, building on

  2. Resistance, Justice, and Commitment to Change

    Foster, Rex D.


    This research focused on individual responses to organizational change by exploring the relationships among individual resistance, organizational justice, and commitment to change following organizational change implementations in three organizations. To accomplish this, Web-based questionnaires were used to gather individual-level quantitative…

  3. Identification of Determinants of Organizational Commitment and ...

    In Nigeria today, workplace is enveloped by the fear of downsizing, trouncing of job security ... downsizing; telecommunity, merger and acquisition, globalizations and diversity, .... The affective element means emotional commitment of an employee to the .... studies have discovered several antecedents and consequences of ...

  4. Planning and commitment in cultural heritage projects

    Baarveld, Marlijn; Smit, Marnix; Dewulf, Geert P.M.R.


    Purpose – The purpose of the study is to generate insights into the planning process for reusing cultural heritage within urban redevelopment projects and identifies barriers to and drivers for stakeholder commitment. Design/methodology/approach – Characteristics of five Dutch urban redevelopment pr

  5. Planning and commitment in cultural heritage projects

    Baarveld, M.Y.; Smit, M.; Dewulf, G.P.M.R.


    Purpose – The purpose of the study is to generate insights into the planning process for reusing cultural heritage within urban redevelopment projects and identifies barriers to and drivers for stakeholder commitment. Design/methodology/approach – Characteristics of five Dutch urban redevelopment

  6. Job insecurity, organisational commitment and work engagement ...

    commitment as a unidimensional construct based on employees' emotional attachment to the ..... as increased stress, anxiety and depression. ..... employee outcomes: the moderating role of emotional intelligence and the leader- .... Do its antecedents vary according to gender, economic sector and the measure used?',.

  7. Cohabitation and Marital Stability: Quality or Commitment.

    Thomson, Elizabeth; Colella, Ugo


    Used data from National Survey of Families and Households to examine cohabitation. Couples who cohabited before marriage reported lower quality marriages, lower commitment to institution of marriage, more individualistic views of marriage (wives only), and greater likelihood of divorce than couples who did not cohabit. Effects were generally…

  8. Organizational Justice and Commitment in Interscholastic Sports

    Whisenant, Warren


    The purpose of this study was to determine the effect of three organizational justice dimensions on the commitment of high school student athletes (N = 480) to continue playing a referent sport. The athletes were asked to complete an instrument designed to assess their perceived levels of justice displayed by their coaches in three justice…

  9. Competency management : Balancing between commitment and control

    Heinsman, H.; Hoogh, de A.H.B.; Muijen, van J.J.; Koopman, P.L.


    This study investigated the relationships between commitment and control approaches and the use of competency management by adopting the theory of planned behavior. Questionnaires were filled out by 43 human resource experts working in different organizations. We expected components of the theory of

  10. New Commitment Options: Compatibility with Emissions Trading



    This paper considers different options for quantitative greenhouse gas emission commitments from the standpoint of their technical compatibility with emissions trading. These are dynamic targets, binding targets with price caps, non-binding targets, sector-wide targets/mechanisms, action targets, allowances and endowments, and long-term permits. This paper considers these options from the standpoint of their compatibility with emissions trading.

  11. Employee Commitment to Organizations: A Conceptual Review.


    35 Exhibit 3 Hypothesized Antecedents and Outcomes of Organizacional Commitment (adopted from Steers, 1977a) Personal characteristics...characteristics Retention tics _Job effort W exencl- I IIf r - Exhibit 4 Comparison of Within versus Between Organization Comitment Scores Organizational State...Naval Training Analysis and Evaluation Group Orlando, FL 32813 Commanding Officer ATTN: TIC , Bldg. 2068 Naval Training Equipment Center Orlando, FL

  12. Resistance, Justice, and Commitment to Change

    Foster, Rex D.


    This research focused on individual responses to organizational change by exploring the relationships among individual resistance, organizational justice, and commitment to change following organizational change implementations in three organizations. To accomplish this, Web-based questionnaires were used to gather individual-level quantitative…

  13. Organizational Commitment among Public Service Employees.

    Young, Brian S.; Worchel, Stephen; Woehr, David J.


    A study that examined factors associated with organizational commitment among 64 blue-collar workers found that the following were positively and significantly related: promotion satisfaction, job characteristics, communication, leadership satisfaction, job satisfaction, intrinsic and extrinsic exchange, and intrinsic and extrinsic rewards.…

  14. Organizational Commitment among Public Service Employees.

    Young, Brian S.; Worchel, Stephen; Woehr, David J.


    A study that examined factors associated with organizational commitment among 64 blue-collar workers found that the following were positively and significantly related: promotion satisfaction, job characteristics, communication, leadership satisfaction, job satisfaction, intrinsic and extrinsic exchange, and intrinsic and extrinsic rewards.…

  15. Organic semiconductors: What makes the spin relax?

    Bobbert, Peter A.


    Spin relaxation in organic materials is expected to be slow because of weak spin-orbit coupling. The effects of deuteration and coherent spin excitation show that the spin-relaxation time is actually limited by hyperfine fields.

  16. Relaxation Techniques to Manage IBS Symptoms

    ... the Day Art of IBS Gallery Contact Us Relaxation Techniques to Manage IBS Symptoms Details Content Last Updated: ... Topic Psychological Treatments Understanding Stress Cognitive Behavioral Therapy Relaxation Techniques for IBS You’ve been to the doctor ...

  17. 78 FR 2672 - Application for Final Commitment for a Long-Term Loan or Financial Guarantee in Excess of $100...


    ... From the Federal Register Online via the Government Publishing Office EXPORT-IMPORT BANK OF THE UNITED STATES Application for Final Commitment for a Long-Term Loan or Financial Guarantee in Excess of $100 Million: AP078595XX, AP078595XA, AP078595XB AGENCY: Export-Import Bank of the United...

  18. 78 FR 2673 - Application for Final Commitment for a Long-Term Loan or Financial Guarantee in Excess of $100...


    ... From the Federal Register Online via the Government Publishing Office ] EXPORT-IMPORT BANK OF THE UNITED STATES Application for Final Commitment for a Long-Term Loan or Financial Guarantee in Excess of $100 Million: AP087730XX, AP087730XA AGENCY: Export-Import Bank of the United States. ACTION:...

  19. 78 FR 59688 - Application for Final Commitment for a Long-Term Loan or Financial Guarantee in Excess of $100...


    ... From the Federal Register Online via the Government Publishing Office EXPORT-IMPORT BANK OF THE UNITED STATES Application for Final Commitment for a Long-Term Loan or Financial Guarantee in Excess of $100 Million: AP088292XX & AP088292XA AGENCY: Export-Import Bank of the United States. ACTION:...

  20. Plasmon-mediated energy relaxation in graphene

    Ferry, D. K. [School of Electrical, Computer, and Energy Engineering, Arizona State University, Tempe, Arizona 85287-5706 (United States); Somphonsane, R. [Department of Physics, King Mongkut' s Institute of Technology, Ladkrabang, Bangkok 10520 (Thailand); Ramamoorthy, H.; Bird, J. P. [Department of Electrical Engineering, University at Buffalo, the State University of New York, Buffalo, New York 14260-1500 (United States)


    Energy relaxation of hot carriers in graphene is studied at low temperatures, where the loss rate may differ significantly from that predicted for electron-phonon interactions. We show here that plasmons, important in the relaxation of energetic carriers in bulk semiconductors, can also provide a pathway for energy relaxation in transport experiments in graphene. We obtain a total loss rate to plasmons that results in energy relaxation times whose dependence on temperature and density closely matches that found experimentally.

  1. Impact Of Leadership Styles On Employee Organizational Commitment

    Sharon Clinebell


    Full Text Available This research study examines the relationship between transformational, transactional and passive/avoidant leadership styles and three dimensions of organizational commitment – affective, continuance, and normative in two subsidiaries of one multinational organization. The research findings revealed that transformational leadership has the strongest impact on affective commitment, although transactional leadership also affects affective commitment. Transformational leadership also has a significant positive affect on normative commitment. Transactional leadership has a significant positive affect on continuance commitment and positive/avoidant leadership has a significant negative affect on affective commitment.

  2. Non-interactive and Reusable Non-malleable Commitment Schemes

    Damgård, Ivan Bjerre; Groth, Jens


    We consider non-malleable (NM) and universally composable (UC) commitment schemes in the common reference string (CRS) model. We show how to construct non-interactive NM commitments that remain non-malleable even if the adversary has access to an arbitrary number of commitments from honest players...... version based on the strong RSA assumption. For UC commitments, we show that existence of a UC commitment scheme in the CRS model (interactive or not) implies key exchange and - for a uniform reference string - even implies oblivious transfer. This indicates that UC commitment is a strictly stronger...

  3. Conceptual Commitments of AGI Systems: Editorial, Commentaries, and Response


    Editorial: Conceptual Commitments of AGI Systems Haris Dindo / James Marshall / Giovanni Pezzulo 23 General Problems of Unified Theories of Cognition, and Another Conceptual Commitment of LIDA Benjamin Angerer / Stefan Schneider 26 LIDA, Committed to Consciousness Antonio Chella 28 The Radical Interactionism Conceptual Commitment Olivier L. Georgeon / David W. Aha 31 Commitments of the Soar Cognitive Architecture John E. Laird 36 Conceptual Commitments of AGI Projects Pei Wang 39 Will (dis)Embodied LIDA Agents be Socially Interactive? Travis J. Wiltshire / Emilio J. C. Lobato / Florian G. Jentsch / Stephen M. Fiore 42 Author's Response to Commentaries Steve Strain / Stan Franklin 48

  4. Collisionless Relaxation of Stellar Systems

    Kandrup, H E


    The objective of the work summarised here has been to exploit and extend ideas from plasma physics and accelerator dynamics to formulate a unified description of collisionless relaxation that views violent relaxation, Landau damping, and phase mixing as (manifestations of) a single phenomenon. This approach embraces the fact that the collisionless Boltzmann equation (CBE), the basic object of the theory, is an infinite-dimensional Hamiltonian system, with the distribution function f playing the role of the fundamental dynamical variable, and that, interpreted appropriately, an evolution described by the other Hamiltonian system. Equilibrium solutions correspond to extremal points of the Hamiltonian subject to the constraints associated with Liouville's Theorem. Stable equilibria correspond to energy minima. The evolution of a system out of equilibrium involves (in general nonlinear) phase space oscillations which may -- or may not -- interfere destructively so as to damp away.

  5. Collisionless Relaxation of Stellar Systems

    Kandrup, Henry E.


    The objective of the work summarized here has been to exploit and extend ideas from plasma physics and accelerator dynamics to formulate a unified description of collisionless relaxation of stellar systems that views violent relaxation, Landau damping, and phase mixing as (manifestations of) a single phenomenon. This approach embraces the fact that the collisionless Boltzmann equation (CBE), the basic object of the theory, is an infinite-dimensional Hamiltonian system, with the distribution function f playing the role of the fundamental dynamical variable, and that, interpreted appropriately, an evolution described by the CBE is no different fundamentally from an evolution described by any other Hamiltonian system. Equilibrium solutions f0 correspond to extremal points of the Hamiltonian subject to the constraints associated with Liouville's Theorem. Stable equilibria correspond to energy minima. The evolution of a system out of equilibrium involves (in general nonlinear) phase space oscillations which may - or may not - interfere destructively so as to damp away.

  6. Kinetic activation-relaxation technique

    Béland, Laurent Karim; Brommer, Peter; El-Mellouhi, Fedwa; Joly, Jean-François; Mousseau, Normand


    We present a detailed description of the kinetic activation-relaxation technique (k-ART), an off-lattice, self-learning kinetic Monte Carlo (KMC) algorithm with on-the-fly event search. Combining a topological classification for local environments and event generation with ART nouveau, an efficient unbiased sampling method for finding transition states, k-ART can be applied to complex materials with atoms in off-lattice positions or with elastic deformations that cannot be handled with standard KMC approaches. In addition to presenting the various elements of the algorithm, we demonstrate the general character of k-ART by applying the algorithm to three challenging systems: self-defect annihilation in c-Si (crystalline silicon), self-interstitial diffusion in Fe, and structural relaxation in a-Si (amorphous silicon).

  7. Kinetic activation-relaxation technique.

    Béland, Laurent Karim; Brommer, Peter; El-Mellouhi, Fedwa; Joly, Jean-François; Mousseau, Normand


    We present a detailed description of the kinetic activation-relaxation technique (k-ART), an off-lattice, self-learning kinetic Monte Carlo (KMC) algorithm with on-the-fly event search. Combining a topological classification for local environments and event generation with ART nouveau, an efficient unbiased sampling method for finding transition states, k-ART can be applied to complex materials with atoms in off-lattice positions or with elastic deformations that cannot be handled with standard KMC approaches. In addition to presenting the various elements of the algorithm, we demonstrate the general character of k-ART by applying the algorithm to three challenging systems: self-defect annihilation in c-Si (crystalline silicon), self-interstitial diffusion in Fe, and structural relaxation in a-Si (amorphous silicon).

  8. Brief relaxation training program for hospital employees.

    Balk, Judith L; Chung, Sheng-Chia; Beigi, Richard; Brooks, Maria


    Employee stress leads to attrition, burnout, and increased medical costs. We aimed to assess if relaxation training leads to decreased stress levels based on questionnaire and thermal biofeedback. Thirty-minute relaxation training sessions were conducted for hospital employees and for cancer patients. Perceived Stress levels and skin temperature were analyzed before and after relaxation training.

  9. POS Tagging Using Relaxation Labelling

    Padro, L


    Relaxation labelling is an optimization technique used in many fields to solve constraint satisfaction problems. The algorithm finds a combination of values for a set of variables such that satisfies -to the maximum possible degree- a set of given constraints. This paper describes some experiments performed applying it to POS tagging, and the results obtained. It also ponders the possibility of applying it to word sense disambiguation.

  10. Spin relaxation in metallic ferromagnets

    Berger, L.


    The Elliott theory of spin relaxation in metals and semiconductors is extended to metallic ferromagnets. Our treatment is based on the two-current model of Fert, Campbell, and Jaoul. The d→s electron-scattering process involved in spin relaxation is the inverse of the s→d process responsible for the anisotropic magnetoresistance (AMR). As a result, spin-relaxation rate 1/τsr and AMR Δρ are given by similar formulas, and are in a constant ratio if scattering is by solute atoms. Our treatment applies to nickel- and cobalt-based alloys which do not have spin-up 3d states at the Fermi level. This category includes many of the technologically important magnetic materials. And we show how to modify the theory to apply it to bcc iron-based alloys. We also treat the case of Permalloy Ni80Fe20 at finite temperature or in thin-film form, where several kinds of scatterers exist. Predicted values of 1/τsr and Δρ are plotted versus resistivity of the sample. These predictions are compared to values of 1/τsr and Δρ derived from ferromagnetic-resonance and AMR experiments in Permalloy.

  11. Arresting relaxation in Pickering Emulsions

    Atherton, Tim; Burke, Chris


    Pickering emulsions consist of droplets of one fluid dispersed in a host fluid and stabilized by colloidal particles absorbed at the fluid-fluid interface. Everyday materials such as crude oil and food products like salad dressing are examples of these materials. Particles can stabilize non spherical droplet shapes in these emulsions through the following sequence: first, an isolated droplet is deformed, e.g. by an electric field, increasing the surface area above the equilibrium value; additional particles are then adsorbed to the interface reducing the surface tension. The droplet is then allowed to relax toward a sphere. If more particles were adsorbed than can be accommodated by the surface area of the spherical ground state, relaxation of the droplet is arrested at some non-spherical shape. Because the energetic cost of removing adsorbed colloids exceeds the interfacial driving force, these configurations can remain stable over long timescales. In this presentation, we present a computational study of the ordering present in anisotropic droplets produced through the mechanism of arrested relaxation and discuss the interplay between the geometry of the droplet, the dynamical process that produced it, and the structure of the defects observed.

  12. Relaxation response in femoral angiography.

    Mandle, C L; Domar, A D; Harrington, D P; Leserman, J; Bozadjian, E M; Friedman, R; Benson, H


    Immediately before they underwent femoral angiography, 45 patients were given one of three types of audiotapes: a relaxation response tape recorded for this study, a tape of contemporary instrumental music, or a blank tape. All patients were instructed to listen to their audiotape during the entire angiographic procedure. Each audiotape was played through earphones. Radiologists were not told the group assignment or tape contents. The patients given the audiotape with instructions to elicit the relaxation response (n = 15) experienced significantly less anxiety (P less than .05) and pain (P less than .001) during the procedure, were observed by radiology nurses to exhibit significantly less pain (P less than .001) and anxiety (P less than .001), and requested significantly less fentanyl citrate (P less than .01) and diazepam (P less than .01) than patients given either the music (n = 14) or the blank (n = 16) control audiotapes. Elicitation of the relaxation response is a simple, inexpensive, efficacious, and practical method to reduce pain, anxiety, and medication during femoral angiography and may be useful in other invasive procedures.

  13. Supplier Commitment and Production Decisions Under a Forecast-Commitment Contract

    Elizabeth Junqueira Durango-Cohen; Candace Arai Yano


    Manufacturing firms in capital-intensive industries face inherent demand volatility for their products and the inability to change their capacity quickly. To cope with these challenges, manufacturers often enter into contracts with their customers that offer greater certainty of supply in return for more predictable orders. In this paper, we study a "forecast-commitment" contract in which the customer provides a forecast, the supplier makes a production commitment to the customer based on the...

  14. Dating and commitment choices as a function of ethnicity among American college students in California.

    Fiebert, Martin S; Nugent, Dusty; Hershberger, Scott L; Kasdan, Margo


    The incidence of interracial and interethnic dating and marriage in the United States has increased. This investigation examined dating and commitment choices as a function of ethnicity and sex among groups of Euro-American, Hispanic-American, Asian-American, and African-American college students. A convenience sample of college students comprising 329 heterosexual subjects (134 men, 195 women) was surveyed regarding their partner preferences for dating, visiting parents, marriage, and bearing children. It was hypothesized that subjects would consider dating partners from different ethnic groups, but when making a commitment to marriage and children would prefer members of their own group. This hypothesis was supported in half of the groups: Euro-American men, African-American men, Asian-American women, and African-American women. A discussion of dating and commitment choices among ethnic and sex groups is presented and discussed.

  15. Commitment to personal values and guilt feelings in dementia caregivers.

    Gallego-Alberto, Laura; Losada, Andrés; Márquez-González, María; Romero-Moreno, Rosa; Vara, Carlos


    Caregivers' commitment to personal values is linked to caregivers' well-being, although the effects of personal values on caregivers' guilt have not been explored to date. The goal of this study is to analyze the relationship between caregivers´ commitment to personal values and guilt feelings. Participants were 179 dementia family caregivers. Face-to-face interviews were carried out to describe sociodemographic variables and assess stressors, caregivers' commitment to personal values and guilt feelings. Commitment to values was conceptualized as two factors (commitment to own values and commitment to family values) and 12 specific individual values (e.g. education, family or caregiving role). Hierarchical regressions were performed controlling for sociodemographic variables and stressors, and introducing the two commitment factors (in a first regression) or the commitment to individual/specific values (in a second regression) as predictors of guilt. In terms of the commitment to values factors, the analyzed regression model explained 21% of the variance of guilt feelings. Only the factor commitment to family values contributed significantly to the model, explaining 7% of variance. With regard to the regression analyzing the contribution of specific values to caregivers' guilt, commitment to the caregiving role and with leisure contributed negatively and significantly to the explanation of caregivers' guilt. Commitment to work contributed positively to guilt feelings. The full model explained 30% of guilt feelings variance. The specific values explained 16% of the variance. Our findings suggest that commitment to personal values is a relevant variable to understand guilt feelings in caregivers.

  16. Competition with Variety Seeking and Habitual Consumption: Price Commitment or Quality Commitment?

    Liyang Xiong


    Full Text Available This paper investigates price and quality competition in a market where consumers seek variety and habit formation. Variety seeking is modeled as a decrease in the willingness to pay for product purchased on the previous occasion while habitual consumption may increase future marginal utility. We compare two competing strategies: price commitment and quality commitment. With a three-stage Hotelling-type model, we show that variety seeking intensifies while habitual consumption softens the competition. With price commitment, firms supply lower quality levels in period 1 and higher quality levels in period 2, while, with quality commitment, firms charge higher prices in period 1 and lower prices in period 2. However, the habitual consumption brings the opposite effect. In addition, with quality commitment variety seeking leads to a lower profit and a higher consumer surplus, while habitual consumption leads to the opposite results. On the other side, with price commitment these behaviors have no effect on the consumer surplus, although they still lower down the firm profits. Finally, we also identify conditions under which one strategy outperforms the other.

  17. Capturing molecular multimode relaxation processes in excitable gases based on decomposition of acoustic relaxation spectra

    Zhu, Ming; Liu, Tingting; Wang, Shu; Zhang, Kesheng


    Existing two-frequency reconstructive methods can only capture primary (single) molecular relaxation processes in excitable gases. In this paper, we present a reconstructive method based on the novel decomposition of frequency-dependent acoustic relaxation spectra to capture the entire molecular multimode relaxation process. This decomposition of acoustic relaxation spectra is developed from the frequency-dependent effective specific heat, indicating that a multi-relaxation process is the sum of the interior single-relaxation processes. Based on this decomposition, we can reconstruct the entire multi-relaxation process by capturing the relaxation times and relaxation strengths of N interior single-relaxation processes, using the measurements of acoustic absorption and sound speed at 2N frequencies. Experimental data for the gas mixtures CO2-N2 and CO2-O2 validate our decomposition and reconstruction approach.

  18. Time of relaxation in dusty plasma model

    Timofeev, A. V.


    Dust particles in plasma may have different values of average kinetic energy for vertical and horizontal motion. The partial equilibrium of the subsystems and the relaxation processes leading to this asymmetry are under consideration. A method for the relaxation time estimation in nonideal dusty plasma is suggested. The characteristic relaxation times of vertical and horizontal motion of dust particles in gas discharge are estimated by analytical approach and by analysis of simulation results. These relaxation times for vertical and horizontal subsystems appear to be different. A single hierarchy of relaxation times is proposed.

  19. The roles of parties with different commitments under the Kyoto Protocol and implications for NAFTA

    Fauteux, P. [Environment Canada, Ottawa, ON (Canada). Climate Change Bureau


    A government perspective on climate change negotiations was presented with particular reference to Canada's cleaner energy exports, the Kyoto mechanism and the second commitment period. The author emphasized the importance of cleaner energy exports for Canada, although progress is likely to be slow in this area because of the opposition among other Parties. Whatever approach the United States takes to trading, it must be compatible with the Kyoto Protocol. Eligibility for trading in North America was discussed with reference to what effect Canada's ratification of the Protocol would have on energy exports. It was noted that if Canada ratifies, it could be both a buyer and a seller, whereas the United States could only buy and Mexico could only sell. The author also suggested that developing countries or major emitters should take on commitments in order to provide greater compatibility in the North American context, especially if the United States rejoined the Kyoto Protocol.

  20. Commitment bias : mistaken partner selection or ancient wisdom?

    Back, Istvan H.


    Evidence across the social and behavioral sciences points to psychological mechanisms that facilitate the formation and maintenance of interpersonal commitment. In addition, evolutionary simulation studies suggest that a tendency for increased, seemingly irrational commitment is an important trait o

  1. A survey on critical factors influencing organizational commitment

    Hamidreza Kheirkhah


    Full Text Available Organizational commitment is an important issue and organization attitude has become an area of study among many researchers in the fields of organizational behavior. In fact, there are many studies on human resource management where the effects of organizational commitment on other issues have been investigated and the purpose of this research is to find critical factors influencing on organizational commitment. Based on an exploration of the literature review and interviews, the proposed study of this paper extracts 24 variables and using factor analysis, we select the most important factors, which are grouped in four categories. The implementation of our factor analysis has revealed Affective commitment, Continuous commitment, Moral commitment and Enduring commitment are the most important factors influencing organizational commitment.

  2. The potential contribution of sinks to meeting Kyoto Protocol commitments

    Missfeldt, F.; Haites, E.


    The Kyoto Protocol to the climate convention makes provision for sink enhancement activities to contribute to meeting the greenhouse gas emissions limitation commitments of industrialised countries. This paper analyses the potential contribution of sink enhancement activities to meeting commitments...

  3. 5 Things To Know About Relaxation Techniques for Stress

    ... X Y Z 5 Things To Know About Relaxation Techniques for Stress Share: When you’re under stress, ... creating the relaxation response through regular use of relaxation techniques could counteract the negative effects of stress. Relaxation ...

  4. Regulation of Murine Natural Killer Cell Commitment

    Nicholas D Huntington


    Full Text Available NK cells can derive from the same precursors as B and T cells, however to achieve lineage specificity, several transcription factors need to be activated or annulled. While a few important transcription factors have identified for NK genesis the mechanisms of how this is achieved is far from resolved. Adding to the complexity of this, NK cells are found and potentially develop in diverse locations in vivo and it remains to be addressed if a common NK cell precursor seeds diverse niches and how transcription factors may differentially regulate NK cell commitment in distinct microenvironments. Here we will summarise some recent findings in NK cell commitment and discuss how a NK cell transcriptional network might be organised, while addressing some misconceptions and anomalies along the way.

  5. Observing joint action: Coordination creates commitment.

    Michael, John; Sebanz, Natalie; Knoblich, Günther


    Previous research has shown that interpersonal coordination enhances pro-social attitudes and behavior. Here, we extend this research by investigating whether the degree of coordination observed in a joint action enhances the perception of individuals' commitment to the joint action. In four experiments, participants viewed videos of joint actions. In the low coordination condition, two agents made independent individual contributions to a joint action. In the high coordination condition, the individual contributions were tightly linked. Participants judged whether and for how long the observed agents would resist a tempting outside option and remain engaged in the joint action. The results showed that participants were more likely to expect agents to resist outside options when observing joint actions with a high degree of coordination. This indicates that observing interpersonal coordination is sufficient to enhance the perception of commitment to joint action. Copyright © 2016 Elsevier B.V. All rights reserved.

  6. Common Preposition Errors Committed by Iranian Students

    Samaneh Yousefi


    Full Text Available This paper examined some common problems involving prepositions in learning a second language. Many students learning English as a foreign language commonly commit mistakes in prepositions. The aim of this paper is to survey the causes of errors in the use of prepositions that are frequently made by Iranian students. A diagnostic test (35 Multiple choice item was constructed to test the students proficiency in using these prepositions. The prepositions selected for this purpose were; to, in, at, on, with, of, from, for, about, during, into under, over and by. This test was given to a group of 35 intermediate students. The results indicated that the errors committed by the students were due to both Inter-lingual and Intra-lingual interferences. It is hoped that this research will help teachers of English Language to be aware of these problems and re-evaluate their teaching approach.

  7. Religious Belief, Motivation and Moral Commitment

    zahra khazaei


    Full Text Available There are two different approaches followed by moral philosophers regarding the motivational role of moral belief. Having restricted the motivating reasons to belief, the internalists consider the relationship between belief and ethical commitment necessary and believe that moral judgmentis inherentlymotivating. While theexternalists by regarding the belief and desire as reasons for action,they believe that the relationship between belief and actin is not necessary. Therefore, the weakness of will is possible, that is, the agent can acts against his best judgment. Now we put religious belief instead of moral judgment and ask about the motivational role of religious beliefs , that is , what is the relationship between religious beliefs and moral commitment? Are religious beliefs sufficient for moral action? Are they inherently motivating? Considering the impact of religious beliefs on committing ethical acts as necessary or contingent may have various and valuable consequences for the believers in different religions. The purpose of this article is to investigate such psychological relationship between religion and moralityand to seek the motivating influence of religious beliefs. The article tries to analyze the relation between the religious belief and ethical commitment and responds to this question that whether religious beliefs are the necessary and sufficientcondition for committing moral action , or they are just necessary conditions or neither necessary nor sufficient.If they are essential, what other elements can be complementary to religious beliefs? In other words, what other elements can substitute religious belief? To answer these questions, the present study will firstly investigate the stimulating influence of ethical beliefs and then will analyze the two approaches of internalism and externalism in ethics and finally will conclude that the approach of externalism is much closer to the reality. The article then will explain the

  8. Religious Belief, Motivation and Moral Commitment

    zahra khazaei


    Full Text Available There are two different approaches followed by moral philosophers regarding the motivational role of moral belief. Having restricted the motivating reasons to belief, the internalists consider the relationship between belief and ethical commitment necessary and believe that moral judgmentis inherentlymotivating. While theexternalists by regarding the belief and desire as reasons for action,they believe that the relationship between belief and actin is not necessary. Therefore, the weakness of will is possible, that is, the agent can acts against his best judgment. Now we put religious belief instead of moral judgment and ask about the motivational role of religious beliefs , that is , what is the relationship between religious beliefs and moral commitment? Are religious beliefs sufficient for moral action? Are they inherently motivating? Considering the impact of religious beliefs on committing ethical acts as necessary or contingent may have various and valuable consequences for the believers in different religions. The purpose of this article is to investigate such psychological relationship between religion and moralityand to seek the motivating influence of religious beliefs. The article tries to analyze the relation between the religious belief and ethical commitment and responds to this question that whether religious beliefs are the necessary and sufficientcondition for committing moral action , or they are just necessary conditions or neither necessary nor sufficient.If they are essential, what other elements can be complementary to religious beliefs? In other words, what other elements can substitute religious belief? To answer these questions, the present study will firstly investigate the stimulating influence of ethical beliefs and then will analyze the two approaches of internalism and externalism in ethics and finally will conclude that the approach of externalism is much closer to the reality. The article then will explain the

  9. Safe Commits for Transactional Featherweight Java

    Thuong Tran, Thi Mai; Steffen, Martin

    Transactions are a high-level alternative for low-level concurrency-control mechanisms such as locks, semaphores, monitors. A recent proposal for integrating transactional features into programming languages is Transactional Featherweight Java (TFJ), extending Featherweight Java by adding transactions. With support for nested and multi-threaded transactions, its transactional model is rather expressive. In particular, the constructs governing transactions - to start and to commit a transaction - can be used freely with a non-lexical scope. On the downside, this flexibility also allows for an incorrect use of these constructs, e.g., trying to perform a commit outside any transaction. To catch those kinds of errors, we introduce a static type and effect system for the safe use of transactions for TFJ. We prove the soundness of our type system by subject reduction.

  10. Requirements as Goals and Commitments Too

    Chopra, Amit K.; Mylopoulos, John; Dalpiaz, Fabiano; Giorgini, Paolo; Singh, Munindar P.

    In traditional software engineering research and practice, requirements are classified either as functional or non-functional. Functional requirements consist of all functions the system-to-be ought to support, and have been modeled in terms of box-and-arrow diagrams in the spirit of SADT. Non-functional requirements include desired software qualities for the system-to-be and have been described either in natural language or in terms of metrics. This orthodoxy was challenged in the mid-90 s by a host of proposals that had a common theme: all requirements are initially stakeholder goals and ought to be elicited, modeled and analyzed as such. Through systematic processes, these goals can be refined into specifications of functions the system-to-be needs to deliver, while actions assigned to external actors need to be executed. This view is dominating Requirements Engineering (RE) research and is beginning to have an impact on RE practice. We propose a next step along this line of research, by adopting the concept of conditional commitment as companion concept to that of goal. Goals are intentional entities that capture the needs and wants of stakeholders. Commitments, on the other hand, are social concepts that define the willingness and capability of an actor A to fulfill a predicate ϕ for the benefit of actor B, provided B (in return) fulfills predicate ψ for the benefit of actor A. In our conceptualization, goals are mapped to collections of commitments rather than functions, qualities, or actor assignments. We motivate the importance of the concept of commitment for RE through examples and discussion. We also contrast our proposal with state-of-the-art requirements modeling and analysis frameworks, such as KAOS, MAP, i * and Tropos.

  11. Divorced Men More Likely to Commit Suicide



    国人有句俗话:家和万事兴。看来。此言的外延意义非常丰富。本文告诉我们:Divorced Men More Likely to Commit Suicide。文章里出现了一句:do not have the same support networks,其中的same support networks生动形象。汉译却不易。】

  12. Credit And Growth Under Limited Commitment

    Azariadis, Costas; Kaas, Leo


    We consider a linear growth model with idiosyncratic productivity shocks in which producers cannot commit to repay their loans. Borrowing constraints are determined endogenously by the borrowers incentives to repay, assuming that defaulters lose a share of output and are excluded from future trade in the credit market. We characterize necessary and sufficient conditions for the enforceability of a first-best equilibrium growth path. Weak property rights, impatient producers, and small produc...

  13. Constructing rich false memories of committing crime.

    Shaw, Julia; Porter, Stephen


    Memory researchers long have speculated that certain tactics may lead people to recall crimes that never occurred, and thus could potentially lead to false confessions. This is the first study to provide evidence suggesting that full episodic false memories of committing crime can be generated in a controlled experimental setting. With suggestive memory-retrieval techniques, participants were induced to generate criminal and noncriminal emotional false memories, and we compared these false memories with true memories of emotional events. After three interviews, 70% of participants were classified as having false memories of committing a crime (theft, assault, or assault with a weapon) that led to police contact in early adolescence and volunteered a detailed false account. These reported false memories of crime were similar to false memories of noncriminal events and to true memory accounts, having the same kinds of complex descriptive and multisensory components. It appears that in the context of a highly suggestive interview, people can quite readily generate rich false memories of committing crime.

  14. Predicting Organizational Commitment from Organizational Culture in Turkish Primary Schools

    Ipek, Cemalettin


    This study aims to describe organizational culture and commitment and to predict organizational commitment from organizational culture in Turkish primary schools. Organizational Culture Scale (Ipek "1999") and Organizational Commitment Scale (Balay "2000") were used in the data gathering process. The data were collected from…

  15. Job Stress and Organizational Commitment among Mentoring Coordinators

    Michael, Orly; Court, Deborah; Petal, Pnina


    Purpose: This research aims to examine the impact of job stress on the organizational commitment of a random, representative sample of coordinators in the Israeli educational mentoring organization PMP. Organizational commitment, including affective, continuance and normative commitment, refers to worker relations in the organization, and how…

  16. Predictors of Career Commitment: A Test of Three Theoretical Models.

    Arnold, John


    Three theories of commitment were tested by surveying 92 nursing students 3 times during their first year. The social exchange approach and unmet expectations about nursing careers influenced commitment during the latter eight months. The circumstances surrounding the decision to enter nurse training (behavioral approach) predicted commitment only…

  17. Predicting Organizational Commitment from Organizational Culture in Turkish Primary Schools

    Ipek, Cemalettin


    This study aims to describe organizational culture and commitment and to predict organizational commitment from organizational culture in Turkish primary schools. Organizational Culture Scale (Ipek "1999") and Organizational Commitment Scale (Balay "2000") were used in the data gathering process. The data were collected from 415 primary teachers…

  18. 48 CFR 970.5226-3 - Community commitment.


    ... 48 Federal Acquisition Regulations System 5 2010-10-01 2010-10-01 false Community commitment. 970... for Management and Operating Contracts 970.5226-3 Community commitment. As prescribed in 48 CFR 970.2673-2, insert the following clause: Community Commitment (DEC 2000) It is the policy of the DOE to...

  19. Effects of Team and Organizational Commitment--A Longitudinal Study

    Neininger, Alexandra; Lehmann-Willenbrock, Nale; Kauffeld, Simone; Henschel, Angela


    Retention management, i.e., keeping qualified employees, is a top priority for contemporary organizations. Commitment, and especially team commitment, can be the key to mastering this challenge. There is a lack of longitudinal research concerning the development and the direction of the effects of team commitment over time. In a longitudinal…

  20. Effects of Team and Organizational Commitment--A Longitudinal Study

    Neininger, Alexandra; Lehmann-Willenbrock, Nale; Kauffeld, Simone; Henschel, Angela


    Retention management, i.e., keeping qualified employees, is a top priority for contemporary organizations. Commitment, and especially team commitment, can be the key to mastering this challenge. There is a lack of longitudinal research concerning the development and the direction of the effects of team commitment over time. In a longitudinal…

  1. Compaction and relaxation of biofilms

    Valladares Linares, R.


    Operation of membrane systems for water treatment can be seriously hampered by biofouling. A better characterization of biofilms in membrane systems and their impact on membrane performance may help to develop effective biofouling control strategies. The objective of this study was to determine the occurrence, extent and timescale of biofilm compaction and relaxation (decompaction), caused by permeate flux variations. The impact of permeate flux changes on biofilm thickness, structure and stiffness was investigated in situ and non-destructively with optical coherence tomography using membrane fouling monitors operated at a constant crossflow velocity of 0.1 m s−1 with permeate production. The permeate flux was varied sequentially from 20 to 60 and back to 20 L m−2 h−1. The study showed that the average biofilm thickness on the membrane decreased after elevating the permeate flux from 20 to 60 L m−2 h−1 while the biofilm thickness increased again after restoring the original flux of 20 L m−2 h−1, indicating the occurrence of biofilm compaction and relaxation. Within a few seconds after the flux change, the biofilm thickness was changed and stabilized, biofilm compaction occurred faster than the relaxation after restoring the original permeate flux. The initial biofilm parameters were not fully reinstated: the biofilm thickness was reduced by 21%, biofilm stiffness had increased and the hydraulic biofilm resistance was elevated by 16%. Biofilm thickness was related to the hydraulic biofilm resistance. Membrane performance losses are related to the biofilm thickness, density and morphology, which are influenced by (variations in) hydraulic conditions. A (temporarily) permeate flux increase caused biofilm compaction, together with membrane performance losses. The impact of biofilms on membrane performance can be influenced (increased and reduced) by operational parameters. The article shows that a (temporary) pressure increase leads to more

  2. Suppression of Raman electron spin relaxation of radicals in crystals. Comparison of Cu2+ and free radical relaxation in triglycine sulfate and Tutton salt single crystals.

    Hoffmann, S K; Goslar, J; Lijewski, S


    Electron spin-lattice relaxation was measured by the electron spin echo method in a broad temperature range above 4.2 K for Cu(2+) ions and free radicals produced by ionizing radiation in triglycine sulfate (TGS) and Tutton salt (NH4)(2)Zn(SO4)2 ⋅ 6H2O crystals. Localization of the paramagnetic centres in the crystal unit cells was determined from continuous wave electron paramagnetic resonance spectra. Various spin relaxation processes and mechanisms are outlined. Cu(2+) ions relax fast via two-phonon Raman processes in both crystals involving the whole phonon spectrum of the host lattice. This relaxation is slightly slower for TGS where Cu(2+) ions are in the interstitial position. The ordinary Raman processes do not contribute to the radical relaxation which relaxes via the local phonon mode. The local mode lies within the acoustic phonon band for radicals in TGS but within the optical phonon range in (NH4)(2)Zn(SO4)2 ⋅ 6H2O. In the latter the cross-relaxation was considered. A lack of phonons around the radical molecules suggested a local crystal amorphisation produced by x- or γ-rays.

  3. Plasma Relaxation in Hall Magnetohydrodynamics

    Shivamoggi, B K


    Parker's formulation of isotopological plasma relaxation process in magnetohydrodynamics (MHD) is extended to Hall MHD. The torsion coefficient alpha in the Hall MHD Beltrami condition turns out now to be proportional to the "potential vorticity." The Hall MHD Beltrami condition becomes equivalent to the "potential vorticity" conservation equation in two-dimensional hydrodynamics if the Hall MHD Lagrange multiplier beta is taken to be proportional to the "potential vorticity" as well. The winding pattern of the magnetic field lines in Hall MHD then appears to evolve in the same way as "potential vorticity" lines in 2D hydrodynamics.

  4. Spectral Estimation of NMR Relaxation

    Naugler, David G.; Cushley, Robert J.


    In this paper, spectral estimation of NMR relaxation is constructed as an extension of Fourier Transform (FT) theory as it is practiced in NMR or MRI, where multidimensional FT theory is used. nD NMR strives to separate overlapping resonances, so the treatment given here deals primarily with monoexponential decay. In the domain of real error, it is shown how optimal estimation based on prior knowledge can be derived. Assuming small Gaussian error, the estimation variance and bias are derived. Minimum bias and minimum variance are shown to be contradictory experimental design objectives. The analytical continuation of spectral estimation is constructed in an optimal manner. An important property of spectral estimation is that it is phase invariant. Hence, hypercomplex data storage is unnecessary. It is shown that, under reasonable assumptions, spectral estimation is unbiased in the context of complex error and its variance is reduced because the modulus of the whole signal is used. Because of phase invariance, the labor of phasing and any error due to imperfect phase can be avoided. A comparison of spectral estimation with nonlinear least squares (NLS) estimation is made analytically and with numerical examples. Compared to conventional sampling for NLS estimation, spectral estimation would typically provide estimation values of comparable precision in one-quarter to one-tenth of the spectrometer time when S/N is high. When S/N is low, the time saved can be used for signal averaging at the sampled points to give better precision. NLS typically provides one estimate at a time, whereas spectral estimation is inherently parallel. The frequency dimensions of conventional nD FT NMR may be denoted D1, D2, etc. As an extension of nD FT NMR, one can view spectral estimation of NMR relaxation as an extension into the zeroth dimension. In nD NMR, the information content of a spectrum can be extracted as a set of n-tuples (ω1, … ωn), corresponding to the peak maxima

  5. Relaxing Chosen-Ciphertext Security

    Canetti, Ran; Krawczyk, Hugo; Nielsen, Jesper Buus


    Security against adaptive chosen ciphertext attacks (or, CCA security) has been accepted as the standard requirement from encryption schemes that need to withstand active attacks. In particular, it is regarded as the appropriate security notion for encryption schemes used as components within...... “for most practical purposes.” We propose a relaxed variant of CCA security, called Replayable CCA (RCCA) security. RCCA security accepts as secure the non-CCA (yet arguably secure) schemes mentioned above; furthermore, it suffices for most existing applications of CCA security. We provide three...

  6. [Evaluation of muscle relaxant requirement for hospital anesthesia].

    Shchegolev, A V; Levshankov, A I; Bogomolov, B N; Pereloma, V I; Dumnov, A G


    The rationale for cost-effectiveness of modern muscle relaxants (MR) administration in general anesthesia was evaluated. New MRs are more expensive than traditionally used pipecuronium and succinylcholine. However, the old MRs are often required as a block reversion with anticholinesterase medicines at the end of surgery, the longer artificial lung ventilation and observation in patients during recovery in intensive care unit. It was found that the district military hospital had done an annual average of about 900 general anesthesia assisted with artificial ventilation and muscle relaxation. About 2% of all anesthesias accrue to short-term anesthesia, the 27% to medium-term and 71% to long-term. 81% of the medium-term anesthesia accrue small hospitals. According to cost/effectiveness the most optimal muscle relaxants administration scheme for short-term (up to 30 min) anesthesia was mivacurium, for the operation of medium duration (30-120 min)--rocuronium, for long-term (120 min)--pipecuronium. An electronic form of annual report, which allows to obtain the necessary data for calculation of annual muscle relaxants demand and costs both in hospital and in the whole of the armed forces quickly, was developed.

  7. Commitment: Functions, Formation, and the Securing of Romantic Attachment.

    Stanley, Scott M; Rhoades, Galena K; Whitton, Sarah W


    In this theoretical paper, we review central concepts in the psychological literature on relationship commitment to provide a foundation to discuss two themes related to long-term romantic relationships and marriages. First, we describe and discuss the role that commitment plays in stabilizing romantic attachment. Second, we use empirical research on cohabitation to highlight how the formation of commitment can be undermined by what are now common trajectories of couple development. The first topic underscores an increasingly important role for commitment in an age of companionate marriage. The second topic draws attention to dynamics that can affect the strength of romantic commitments, especially in marriage.

  8. Florida's outpatient commitment law: a lesson in failed reform?

    Petrila, John; Christy, Annette


    An involuntary outpatient commitment law became effective in Florida in January 2005. However, only 71 orders for outpatient commitment have been issued in three years, even though during that period 41,997 adults had two or more 72-hour involuntary emergency examinations under Florida's civil commitment law. This column describes the criteria for outpatient commitment in the Florida statute and discusses possible reasons for its low rate of use, including additional statutory criteria that make filing a petition for outpatient commitment difficult, lack of community treatment resources, and lack of enforcement mechanisms.

  9. Relaxation of liquid bridge after droplets coalescence

    Jiangen Zheng


    Full Text Available We investigate the relaxation of liquid bridge after the coalescence of two sessile droplets resting on an organic glass substrate both experimentally and theoretically. The liquid bridge is found to relax to its equilibrium shape via two distinct approaches: damped oscillation relaxation and underdamped relaxation. When the viscosity is low, damped oscillation shows up, in this approach, the liquid bridge undergoes a damped oscillation process until it reaches its stable shape. However, if the viscous effects become significant, underdamped relaxation occurs. In this case, the liquid bridge relaxes to its equilibrium state in a non-periodic decay mode. In depth analysis indicates that the damping rate and oscillation period of damped oscillation are related to an inertial-capillary time scale τc. These experimental results are also testified by our numerical simulations with COMSOL Multiphysics.

  10. Cross relaxation in nitroxide spin labels

    Marsh, Derek


    Cross relaxation, and mI -dependence of the intrinsic electron spin-lattice relaxation rate We , are incorporated explicitly into the rate equations for the electron-spin population differences that govern the saturation behaviour of 14N- and 15N-nitroxide spin labels. Both prove important in spin-label EPR and ELDOR, particularly for saturation recovery studies. Neither for saturation recovery, nor for CW-saturation EPR and CW-ELDOR, can cross relaxation be described simply by increasing the value of We , the intrinsic spin-lattice relaxation rate. Independence of the saturation recovery rates from the hyperfine line pumped or observed follows directly from solution of the rate equations including cross relaxation, even when the intrinsic spin-lattice relaxation rate We is mI -dependent.

  11. Utilizing RELAX NG Schemas in XML Editors

    Schmied, Martin


    This thesis explores the possibilities of utilizing RELAX NG schemata in the process of editing XML documents. The ultimate goal of this thesis is to prototype a system supporting user while editing XML document with bound RELAX NG schema inside the Eclipse IDE. Such a system comprises two major components -- an integration of RELAX NG validator and an autocompletion engine. Design of the autocompletion engine represents the main contribution of this thesis, because similar systems are almost...

  12. Temperature relaxation in dense plasma mixtures

    Faussurier, Gérald; Blancard, Christophe


    We present a model to calculate temperature-relaxation rates in dense plasma mixtures. The electron-ion relaxation rates are calculated using an average-atom model and the ion-ion relaxation rates by the Landau-Spitzer approach. This method allows the study of the temperature relaxation in many-temperature electron-ion and ion-ion systems such as those encountered in inertial confinement fusion simulations. It is of interest for general nonequilibrium thermodynamics dealing with energy flows between various systems and should find broad use in present high energy density experiments.

  13. Baryogenesis via Elementary Goldstone Higgs Relaxation

    Gertov, Helene; Pearce, Lauren; Yang, Louis


    We extend the relaxation mechanism to the Elementary Goldstone Higgs frame- work. Besides studying the allowed parameter space of the theory we add the minimal ingredients needed for the framework to be phenomenologically viable. The very nature of the extended Higgs sector allows to consider very flat scalar potential directions along which the relaxation mechanism can be implemented. This fact translates into wider regions of applicability of the relaxation mechanism when compared to the Standard Model Higgs case. Our results show that, if the electroweak scale is not fundamental but radiatively generated, it is possible to generate the observed matter-antimatter asymmetry via the relaxation mechanism.

  14. Dielectric relaxation studies in polyvinyl butyral

    Mehendru, P. C.; Kumar, Naresh; Arora, V. P.; Gupta, N. P.


    Dielectric measurements have been made in thick films (˜100 μm) of polyvinyl butyral (PVB) having degree of polymerization n=1600, in the frequency range 100 Hz-100 KHz and temperature range 300-373 K. The results indicated that PVB was in the amorphous phase and observed dielectric dispersion has been assigned as the β-relaxation process. The β relaxation is of Debye type with symmetrical distribution of relaxation times. The dielectric relaxation strength Δɛ and the distribution parameters β¯ increase with temperature. The results can be qualitatively explained by assuming the hindered rotation of the side groups involving hydroxyl/acetate groups.

  15. Relaxation and Visualization Strategies for Story Telling



    The importance of training students to tell or retell story is self - evident for mastering English language. The following activity introduces relaxation and visualization strategies for story telling.

  16. Relaxation of Dielectric Loss Peak over Intermediate Temperature Range in Bi5TiNbWO15 Intergrowth

    WANG Wei; WANG Xiao-Juan; ZHU Jun; MAO Xiang-Yu; CHEN Xiao-Bing


    @@ A dielectric loss peak with relaxation-type characteristic is observed in Bi5TiNbWO15 over 200-400℃. The modified Cole-Cole relation by introducing relaxation strength as another important fitting parameter is used to describe this temperature-dependent behaviour of dielectric relaxation process. This peak is considered to be associated with the oxygen vacancies inside the grains and with its activation energy by relaxation determined to be 0.76eV. The obtained broadening factor α is around 0.4, which indicates a strong correlation between those relaxation units. It is confirmed that the behaviour of this peak is due to the combined effects of the dielectric relaxation and electrical conduction by the thermal motion of oxygen vacancies. These results are further confirmed in Bi5TiNbWO15 samples through oxidization atmosphere treatment and Nd modification respectively.

  17. Toward a Theory of Organizational Commitment.


    A0D-AI03 358 OREGON UNIV EUGENE GRADUATE SCHOOL OF MANAGEMENT AND--ETC F/0 5/1 TOWARD A THEORY OF ORGANIZATIONAL COMMITMENT.(U) AUG A1 R T MOWDAY, R...M STEERS, L W PORTER N00014-81-K 0026 UNCLASSIFIED TR-8 ML EhEE"hE hhEEE~EE7hhhh LEVEr / 00 Gradate choo of anagmen Univrsit of rego -VI Euee0reo 70...Oregon Eugene , OR 97403 Dr. Gerald R. Stoffer Aerospace Psychologist LT, Medical Service Corp. Code N-712 HAVTRAEQUIPCEN Orlando, FL 32813 Dr

  18. Mimetic Methods for Lagrangian Relaxation of Magnetic Fields

    Candelaresi, Simon; Hornig, Gunnar


    We present a new code that performs a relaxation of a magnetic field towards a force-free state (Beltrami field) using a Lagrangian numerical scheme. Beltrami fields are of interest for the dynamics of many technical and astrophysical plasmas as they are the lowest energy states that the magnetic field can reach. The numerical method strictly preserves the magnetic flux and the topology of magnetic field lines. In contrast to other implementations we use mimetic operators for the spatial derivatives in order to improve accuracy for high distortions of the grid. Compared with schemes using direct derivatives we find that the final state of the simulation approximates a force-free state with a significantly higher accuracy. We implement the scheme in a code which runs on graphical processing units (GPU), which leads to an enhanced computing speed compared to previous relaxation codes.

  19. Nuclear relaxation via paramagnetic impurities

    Dzheparov, F S; Jacquinot, J F


    First part of the work contains a calculation of the kinetics of nuclear relaxation via paramagnetic impurities for systems with arbitrary (including fractal) space dimension d basing on ideas, which run current for 3d objects now. A new mean-field-type theory is constructed in the second part of the work. It reproduces all results of the first part for integer d and gives a possibility to describe the process for longer time, when a crossover to Balagurov-Waks asymptotics starts to develop. Solutions of the equations of the new theory are constructed for integer d. To obtain the solutions a method of calculation of the low-energy and long-wave asymptotics for T matrix of potential scattering out of the mass shell for singular repulsive potentials is developed

  20. Relaxing Chosen-Ciphertext Security

    Canetti, Ran; Krawczyk, Hugo; Nielsen, Jesper Buus


    Security against adaptive chosen ciphertext attacks (or, CCA security) has been accepted as the standard requirement from encryption schemes that need to withstand active attacks. In particular, it is regarded as the appropriate security notion for encryption schemes used as components within...... general protocols and applications. Indeed, CCA security was shown to suffice in a large variety of contexts. However, CCA security often appears to be somewhat too strong: there exist encryption schemes (some of which come up naturally in practice) that are not CCA secure, but seem sufficiently secure...... “for most practical purposes.” We propose a relaxed variant of CCA security, called Replayable CCA (RCCA) security. RCCA security accepts as secure the non-CCA (yet arguably secure) schemes mentioned above; furthermore, it suffices for most existing applications of CCA security. We provide three...

  1. A study on relationship between social entrepreneurship and organizational commitment

    Yadollah Hemmati


    Full Text Available During the past few years, organizational commitment has been a major concern in different types of business activities including banking industry. In this paper, we present an empirical investigation to study the relationship between social entrepreneurship and organizational commitment. The proposed study of this paper adapts a standard questionnaire developed by Meyer and Allen [Meyer, J. P., & Allen, N. J. (1991. A three-component conceptualization of organizational commitment. Human resource management review, 1(1, 61-89]. Cronbach alpha has been calculated for affective commitment, employee engagement and normative commitment as 0.77, 0.79 and 0.61, respectively. The results of survey indicate that affective commitment, employee engagement and normative commitment have positively influenced organizational commitment, significantly. In addition, Freedman test has indicated that normative commitment is number one priority with mean rank of 2.85 followed by affective commitment with mean rank of 2.47 and employee engagement with the mean rank of 2.26.


    Nildes Raimunda Pitombo Leite


    Full Text Available The main objective of this paper is to analyze the characteristics of the strategic people management, the strategy of retention of professional and of obtaining of organizational commitment, by taking up basis the case of Caulim da Amazônia S.A. – CADAM/Pará Pigmentos S.A. – PPSA and seeking to answer the question: what are the characteristics of the strategic management of people, focusing on retention strategy of professional and obtaining of organizational commitment in their peculiarities of remote organizational structure? The research subjects are directors, managers, HR professionals, supervisors and coordinators of units Ipixuna, Monte Dourado and Barcarena, located in northern region of Brazil, for a total of thirty-six respondents. The results show, at the interfaces of the three units, traits that unite people in all these places and around the same purpose: to retain talented professionals. One could say that, it becomes possible to identify the peculiarities that leads to commitment of people with the organizational objectives, these organizational structures, from the strategic approach of people management. The retention of professionals is conditioned on adaptive capacity of these professionals and their families in these regions.

  3. Superparamagnetic relaxation of weakly interacting particles

    Mørup, Steen; Tronc, Elisabeth


    The influence of particle interactions on the superparamagnetic relaxation time has been studied by Mossbauer spectroscopy in samples of maghemite (gamma-Fe2O3) particles with different particle sizes and particle separations. It is found that the relaxation time decreases with decreasing particl...

  4. Postextrasystolic relaxation in the dog heart

    Kuijer, P.J.P.; Heethaar, R.M.; Herbschleb, J.N.; Zimmerman, A.N.E.; Meijler, F.L.


    Left ventricular relaxation was studied in 8 dogs using parameters derived from the left ventricular pressure: the fastest pressure fall and the time constant of pressure decline. Effects of extrasystolic rhythm interventions were examined on the relaxation parameters of the post-relative to the pre

  5. Superparamagnetic relaxation in alpha-Fe particles

    Bødker, Franz; Mørup, Steen; Pedersen, Michael Stanley;


    The superparamagnetic relaxation time of carbon-supported alpha-Fe particles with an average size of 3.0 Mm has been studied over a large temperature range by the use of Mossbauer spectroscopy combined with AC and DC magnetization measurements. It is found that the relaxation time varies with tem...

  6. Cross relaxation in nitroxide spin labels

    Marsh, Derek


    -label EPR and ELDOR, particularly for saturation recovery studies. Neither for saturation recovery, nor for CW-saturation EPR and CW-ELDOR, can cross relaxation be described simply by increasing the value of We, the intrinsic spin-lattice relaxation rate. Independence of the saturation recovery rates from...

  7. Magnetization Transfer Induced Biexponential Longitudinal Relaxation

    Prantner, Andrew M.; Bretthorst, G. Larry; Neil, Jeffrey J.; Garbow, Joel R.; Ackerman, Joseph J.H.


    Longitudinal relaxation of brain water 1H magnetization in mammalian brain in vivo is typically analyzed on a per voxel basis using a monoexponential model, thereby assigning a single relaxation time constant to all 1H magnetization within a given voxel. This approach was tested by obtaining inversion recovery data from grey matter of rats at 64 exponentially-spaced recovery times. Using Bayesian probability for model selection, brain water data were best represented by a biexponential function characterized by fast and slow relaxation components. At 4.7 T, the amplitude fraction of the rapidly relaxing component is 3.4 ± 0.7 % with a rate constant of 44 ± 12 s-1 (mean ± SD; 174 voxels from 4 rats). The rate constant of the slow relaxing component is 0.66 ± 0.04 s-1. At 11.7 T, the corresponding values are 6.9 ± 0.9 %, 19 ± 5 s-1, and 0.48 ± 0.02 s-1 (151 voxels from 4 rats). Several putative mechanisms for biexponential relaxation behavior were evaluated, and magnetization transfer between bulk water protons and non-aqueous protons was determined to be the source of biexponential longitudinal relaxation. MR methods requiring accurate quantification of longitudinal relaxation may need to take this effect explicitly into account. PMID:18759367

  8. Windowing Waveform Relaxation of Initial Value Problems

    Yao-lin Jiang


    We present a windowing technique of waveform relaxation for dynamic systems. An effective estimation on window length is derived by an iterative error expression provided here. Relaxation processes can be speeded up if one takes the windowing technique in advance. Numerical experiments are given to further illustrate the theoretical analysis.

  9. A Literature Review on Organizational Commitment – A Comprehensive Summary

    Sayani Ghosh


    Full Text Available The paper encapsulates the evolution of the concept of organizational commitment, and its constructs. It focuses and analyses the literature findings of organizational commitments over the last five decades. It categorizes the approaches into six broad eras, each era being an extension and modification over the preceding ones. This review paper brings to the fore the theories that have emerged in the body of knowledge regarding commitment in organizations in a chronological order, starting from the side bet theory to the more recent multiple commitment approach. The gaps in the theories proposed have been identified and reviewed critically. It is difficult to conceptualize and measure organizational commitment as it encompasses a vast and highly diverse body of knowledge. Due to this it becomes difficult to interpret and conclude from the existing bodies of literature. The paper also highlights the importance of recognizing the individual/employee‟s perspective towards organizational commitment.

  10. Experimental bit commitment based on quantum communication and special relativity.

    Lunghi, T; Kaniewski, J; Bussières, F; Houlmann, R; Tomamichel, M; Kent, A; Gisin, N; Wehner, S; Zbinden, H


    Bit commitment is a fundamental cryptographic primitive in which Bob wishes to commit a secret bit to Alice. Perfectly secure bit commitment between two mistrustful parties is impossible through asynchronous exchange of quantum information. Perfect security is however possible when Alice and Bob split into several agents exchanging classical and quantum information at times and locations suitably chosen to satisfy specific relativistic constraints. Here we report on an implementation of a bit commitment protocol using quantum communication and special relativity. Our protocol is based on [A. Kent, Phys. Rev. Lett. 109, 130501 (2012)] and has the advantage that it is practically feasible with arbitrary large separations between the agents in order to maximize the commitment time. By positioning agents in Geneva and Singapore, we obtain a commitment time of 15 ms. A security analysis considering experimental imperfections and finite statistics is presented.

  11. The effects of professional ethics and commitment on audit quality

    Aliasghar Nasrabadi


    Full Text Available This paper presents a study on the effects of professional ethics and commitments on audit quality. The population of this survey includes all audit managers who were active in auditing official statements of different firms listed in Tehran Stock Exchange in 2014. The study designs a questionnaire in Likert scale and distributes it among 152 randomly selected managers. In our survey, professional ethics consists of four items including confidentiality and impartiality, professional competence, accountability and individual values while organizational commitment consists of three items including emotional commitment, continues commitment and fundamental commitment. Using Pearson correlation as well as regression models, the study has determined a positive and meaningful relationship between professional ethics as well as commitment and audit quality.




    Full Text Available The aim of this study was to check the association of factors like work environment, job security,pay satisfaction and participation in decision making; with organizational commitment of theemployees, working in the banking sector of Pakistan. Two hundred and fifteen (215 responses toquestionnaire-based survey were collected from managerial and non-managerial employees, andanalyzed. The analysis showed positive correlations between the dependent and independentvariables. The relation between job security and organizational commitment was the most significant,indicating that a secure job can yield higher level of commitment. Work environment also had asignificant relation with organizational commitment, showing that a healthy and friendly workenvironment may enhance an employee’s commitment towards his work and organization. Paysatisfaction and participation in decision-making had low correlations with organizationalcommitment. Age and tenure seemed to affect the commitment of employees, with highercommitment shown for higher age and tenure; whereas gender did not show significant change incommitment level of employees.

  13. Conflicting pressures on romantic relationship commitment for anxiously attached individuals.

    Joel, Samantha; MacDonald, Geoff; Shimotomai, Atsushi


    Anxious attachment predicts strong desires for intimacy and stability in romantic relationships, yet the relation between anxious attachment and romantic commitment is unclear. We propose that extant literature has failed to find a consistent relation because anxiously attached individuals experience conflicting pressures on commitment. Data from Australia (N=137) show that relationship satisfaction and felt security each act as suppressors of a positive relation between anxious attachment and commitment. Data from Japan (N=159) replicate the suppression effect of felt security and also demonstrate that the residual positive relation between anxious attachment and commitment can be partly explained by dependence on the partner. These findings suggest that anxiously attached individuals may be ambivalent about commitment. Dissatisfaction and worries about negative evaluation appear to exert downward pressure on commitment, counteracting the upward pressure that is exerted by factors such as relational dependency. © 2011 The Authors. Journal of Personality © 2011, Wiley Periodicals, Inc.

  14. Stress Relaxation in Entangled Polymer Melts

    Hou, Ji-Xuan; Svaneborg, Carsten; Everaers, Ralf


    We present an extensive set of simulation results for the stress relaxation in equilibrium and step-strained bead-spring polymer melts. The data allow us to explore the chain dynamics and the shear relaxation modulus, G(t), into the plateau regime for chains with Z=40 entanglements and into the t......We present an extensive set of simulation results for the stress relaxation in equilibrium and step-strained bead-spring polymer melts. The data allow us to explore the chain dynamics and the shear relaxation modulus, G(t), into the plateau regime for chains with Z=40 entanglements...... and into the terminal relaxation regime for Z=10. Using the known (Rouse) mobility of unentangled chains and the melt entanglement length determined via the primitive path analysis of the microscopic topological state of our systems, we have performed parameter-free tests of several different tube models. We find...

  15. Stress and Relaxation in Relation to Personality

    Harish Kumar Sharma


    Full Text Available Relaxation plays a significant role in facing stress. The aim of the present study is to see whether personality patterns determine an individual’s ability to relax. As a reaction to stress, coping is the best way to handle stress, which requires rational and conscious thinking. Does this ability to relax anyway facilitate coping reactions? A study was conducted on 100 college students. Results revealed that extraverts relax easily than introverts. In addition, if intelligence level is average or above average, relaxation does play a role in facilitating coping reactions. It suggests that in designing techniques of stress management, the personality and intelligence level must be taken into consideration to make techniques effective.

  16. Magnetic Resonance Fingerprinting with short relaxation intervals.

    Amthor, Thomas; Doneva, Mariya; Koken, Peter; Sommer, Karsten; Meineke, Jakob; Börnert, Peter


    The aim of this study was to investigate a technique for improving the performance of Magnetic Resonance Fingerprinting (MRF) in repetitive sampling schemes, in particular for 3D MRF acquisition, by shortening relaxation intervals between MRF pulse train repetitions. A calculation method for MRF dictionaries adapted to short relaxation intervals and non-relaxed initial spin states is presented, based on the concept of stationary fingerprints. The method is applicable to many different k-space sampling schemes in 2D and 3D. For accuracy analysis, T1 and T2 values of a phantom are determined by single-slice Cartesian MRF for different relaxation intervals and are compared with quantitative reference measurements. The relevance of slice profile effects is also investigated in this case. To further illustrate the capabilities of the method, an application to in-vivo spiral 3D MRF measurements is demonstrated. The proposed computation method enables accurate parameter estimation even for the shortest relaxation intervals, as investigated for different sampling patterns in 2D and 3D. In 2D Cartesian measurements, we achieved a scan acceleration of more than a factor of two, while maintaining acceptable accuracy: The largest T1 values of a sample set deviated from their reference values by 0.3% (longest relaxation interval) and 2.4% (shortest relaxation interval). The largest T2 values showed systematic deviations of up to 10% for all relaxation intervals, which is discussed. The influence of slice profile effects for multislice acquisition is shown to become increasingly relevant for short relaxation intervals. In 3D spiral measurements, a scan time reduction of 36% was achieved, maintaining the quality of in-vivo T1 and T2 maps. Reducing the relaxation interval between MRF sequence repetitions using stationary fingerprint dictionaries is a feasible method to improve the scan efficiency of MRF sequences. The method enables fast implementations of 3D spatially resolved

  17. Which serial killers commit suicide? An exploratory study.

    Lester, David; White, John


    In a sample of 483 serial killers, 6.2% were documented to have committed suicide. Those who committed suicide were found to come from more dysfunctional homes characterized by more psychiatric disturbance in the parents. The sexual acts involved in the murders by the suicides seemed to be more deviant in some aspects, such as committing more bizarre sexual acts or more often taping the murder.

  18. How Providing Mentoring Relates to Career Success and Organizational Commitment: A Study in the General Managerial Population

    Bozionelos, Nikos; Bozionelos, Giorgos; Kostopoulos, Konstantinos; Polychroniou, Panagiotis


    Purpose: This study aims to investigate the relationship of mentoring provided with career success and organizational commitment in the general managerial population. Design/methodology/approach: Participants were 194 native British who were employed in a variety of jobs, professions and industries in the United Kingdom. Findings: Mentoring…

  19. 77 FR 70161 - Application for Final Commitment for a Long-Term Loan or Financial Guarantee in Excess of $100...


    ... Application for Final Commitment for a Long-Term Loan or Financial Guarantee in Excess of $100 Million... long-term loan or financial guarantee in excess of $100 million (as calculated in accordance with....S. manufactured aircraft under operating lease from the United States to South Korea and...

  20. Doctoral Students in Music Education: Occupational Identity, Career Intent and Commitment, and Confidence for Teaching in Higher Education

    Martin, Lisa D.


    The purpose of this study was to examine music education doctoral students' shifting occupational identity beliefs, career intent and commitment, and overall confidence for teaching in higher education. A total of 124 music education doctoral students, enrolled at 29 institutions of higher education in the United States, completed a onetime,…

  1. 78 FR 33090 - Application for Final Commitment for a Long-Term Loan or Financial Guarantee in Excess of $100...


    ... From the Federal Register Online via the Government Publishing Office EXPORT-IMPORT BANK Application for Final Commitment for a Long-Term Loan or Financial Guarantee in Excess of $100 Million: AP087980XX AGENCY: Export-Import Bank of the United States. ACTION: Notice. SUMMARY: This Notice is to...

  2. 78 FR 75344 - Application for Final Commitment for a Long-Term Loan or Financial Guarantee in Excess of $100...


    ... From the Federal Register Online via the Government Publishing Office EXPORT-IMPORT BANK Application for Final Commitment for a Long-Term Loan or Financial Guarantee in Excess of $100 Million: AP088400XX AGENCY: Export-Import Bank of the United States. ACTION: Notice. SUMMARY: This Notice is to...


    Renata Winkler


    Full Text Available Presently, knowledge is considered as the most strategic resource of organizations. The literature on the subject often raises the issues of commitment. The purpose of the article was to discuss the associations between knowledge management and employee commitment. The article presents the stages of knowledge management and describes the category of commitment, taking account of several criteria. In the opinion of the authors, from the point of view of knowledge management particular importance can be attained to the way qualifications, skills, predispositions and knowledge of employees will be used, which, in turn, depends on "quality" of their commitment (its type, intensity, dimension and direction in achieving organizational goals.

  4. The Optimal Depletion of Exhaustible Resource under Different Commitment

    Zhou Wei; Wu Kangping


    There are few papers in the literature focusing on the issue of the optimal depletion of exhaustible resources in the framework of variable time preference. This paper attempts to analyze the pure consumption of exhaustible resource under hy- perbolic time preference, and to discuss the optimal depletion rate and the effect of the protection of the exhaustible resource under different commitment abilities. The results of model show that the case of the hyperbolic discount with the full commitment of the govemment is equivalent to the case of constant discount of the social planner problem. In that case, the optimal depletion rate and the initial consumption of exhaustible resource are the slowest. On the contrary, they are the highest and the myopic behaviors lead to excessive consumption of exhaustible resources inevitably without commitment. Otherwise, in the case of partial commit- ment, the results are between the cases of full commitment and of no commitment. Therefore, with the hyperbolic time preference, the optimal depletion rate of resource depends on the commitment ability. Higher commitment ability leads to lower effective rate of time preference, and consequently, lower depletion rate and lower initial depletion value. The improvement of commitment ability can decrease the impatience and myopia behaviors, and contribute to the protection of the exhaustible resources.

  5. Functional Flexibility in Women's Commitment-Skepticism Bias

    Christina M. Brown


    Full Text Available If a woman overestimates her romantic partner's commitment, the cost to her fitness—reproduction without an investing partner—can be considerable. Error Management Theory predicts that women have an evolved bias to be skeptical of men's commitment in a relationship, which reduces the likelihood of making a costly false positive error. However, because error probabilities are inversely related, this commitment-skepticism bias simultaneously increases the likelihood of missed opportunities, or false negatives. False positives when gauging a partner's commitment are the more costly error for women, but missing an opportunity to secure a genuinely high-quality mate can also be quite costly. We predicted and found that women's mating cognitions are functionally flexible, such that women do not exhibit the commitment-skepticism bias when faced with behavioral evidence that a male partner is willing to commit (Study 1. This suggests that relationship-enhancing behaviors are one contextual cue that may lessen the bias. However, not all relationship-enhancing behaviors are equally diagnostic of a person's true commitment intent. When comparing men and women's commitment thresholds, we found that women require more behavioral evidence than men do to feel certain of their partner's commitment to them (Study 2.

  6. [The publication and its commitment to the society].

    Fajardo-Gutiérrez, Arturo


    Publishing a research is one of the most important achievements for a researcher, since it is one of the tools to evaluate his scientific work. This achievement has a three-dimensional commitment: the personal commitment, the commitment with the population from which the data were obtained, and the commitment to the institution where he works. Therefore, publishing in the Revista Médica del Instituto Mexicano del Seguro Social should be a priority and an honor for a researcher of this Institution, since he is working with it to provide solutions to medical problems that affect their beneficiaries.

  7. 48 CFR 2801.602-3 - Ratification of unauthorized commitments.


    ... JUSTICE General DEPARTMENT OF JUSTICE ACQUISITION REGULATIONS SYSTEM Career Development, Contracting... the authority to ratify unauthorized commitments to the chief of the contracting office, except...

  8. Escalation of commitment with transparent future outcomes.

    Karlsson, Niklas; Gärling, Tommy; Bonini, Nicolao


    A frequent case of irrational decision making is the tendency to escalate commitment to a chosen course of action after unsuccessful prior investments of money, effort, or time (sunk costs). In previous research it is argued that escalation does not occur when future outcomes and alternative investments are transparent. Inconsistent with this argument, in an experiment in which undergraduates were presented fictitious investment problems with sunk costs, escalation was demonstrated when full information was given about investment alternatives and estimates of future returns. Thus, it is indicated that people may escalate despite knowing that it will not make them economically better off. A more comprehensive understanding of escalation requires disentangling people's noneconomic reasons for escalation.

  9. Nanotechnology to drive stem cell commitment.

    Bressan, Eriberto; Carraro, Amedeo; Ferroni, Letizia; Gardin, Chiara; Sbricoli, Luca; Guazzo, Riccardo; Stellini, Edoardo; Roman, Marco; Pinton, Paolo; Sivolella, Stefano; Zavan, Barbara


    Stem cells (SCs) are undifferentiated cells responsible for the growth, homeostasis and repair of many tissues. The maintenance and survival of SCs is strongly influenced by several stimuli from the local microenvironment. The majority of signaling molecules interact with SCs at the nanoscale level. Therefore, scaffolds with surface nanostructures have potential applications for SCs and in the field of regenerative medicine. Although some strategies have already reached the field of cell biology, strategies based on modification at nanoscale level are new players in the fields of SCs and tissue regeneration. The introduction of the possibility to perform such modifications to these fields is probably due to increasing improvements in nanomaterials for biomedical applications, as well as new insights into SC biology. The aim of the present review is to exhibit the most recent applications of nanostructured materials that drive the commitment of adult SCs for potential clinical applications.

  10. Complicating food security: Definitions, discourses, commitments

    William Ramp


    Full Text Available Food security is now commonly seen as one of the defining global issues of the century, intertwined with population and consumption shifts, climate change, environmental degradation, water scarcity, and the geopolitics attending globalization. Some analysts suggest that food security threats are so urgent that philosophical scruples must be set aside in order to concentrate all resources on developing and implementing radical strategies to avert a looming civilizational crisis. This article suggests that definitions of food security invoke commitments and have consequences, and that continued critical and conceptual attention to the language employed in food security research and policy is warranted.

  11. Language Support for Declarative Future Commitments

    Harrison, William


    Sequential programming and work-flow programming are two useful, but radically different, ways of describing computational processing. Of the two, it is sequential programming that we teach all programmers and support by programming languages, whether in procedural, objectoriented, or functional paradigms. We teach workflow as a secondary style of problem decomposition for use in special situations, like distributed or networked processing. Both styles offer complementary advantages, but the fact that they employ radically different models for ownership of continuations interferes with our ability to integrate them in a way that allows them to be taught and used in a single programming language. This paper describes a programming language construct, declarative future commitments, that permit better integration of the two.

  12. American 'committed' drama in Slovene theatres

    Igor Maver


    Full Text Available The purpose of this study is essentially to demonstrate that the delayed stagings of American 'committed' plays, written in the thirties and produced in Slovene theatres immediately after World War Two in the late forties and fifties, were often miscontextualized and partly misinterpreted by the literary critics of the period. This was only in the early post-war years largely due to the need to serve the then ruling ideology and to comply with the criteria of Marxist aesthetisc, especially that of a radical social criticism. However, the later stagings particularly of Arthur Miller's and also Tennessee Williams's plays, did not see the same phenomenon, for it was they that assured the popularity of the American post-war drama on Slovene stages and, even more importantly, helped Slovene theatre to come off age in the sixties.

  13. Job Satisfaction and Organizational Commitment: Affective Commitment Predictors in a Group of Professionals

    Ferretti, Maria Santa

    Job satisfaction and organizational commitment have long been identified as relevant factors for the well-being of individuals within an organization and the success of the organization itself. As the well-being can be, in principle, considered as emergent from the influence of a number of factors, the main goal of a theory of organizations is to identify these factors and the role they can play. In this regard job satisfaction and organizational commitment have been often identified with structural factors allowing an organization to be considered as a system, or a wholistic entity, rather than a simple aggregate of individuals. Furthermore, recent studies have shown that job satisfaction has a significant, direct effect on determining individuals' attachment to an organization and a significant but indirect effect on their intention to leave a company. However, a complete assessment of the role of these factors in establishing and keeping the emergence of an organization is still lacking, due to shortage of measuring instruments and to practical difficulties in interviewing organization members. The present study aims to give a further contribution to what is currently known about the relationship between job satisfaction and affective commitment by using a group of professionals, all at management level. A questionnaire to measure these constructs, following a pilot study, was designed and administered to 1042 participants who were all professionals and had the title of industrial manager or director. The factors relating to job satisfaction and the predictive value of these factors (to predict an employee's emotional involvement with their organization) were simultaneously tested by a confirmative factorial model. The results were generalized with a multi-sample procedure by using models of structural equations. This procedure was used to check whether these factors could be considered or not as causes producing the measured affective commitment. The results

  14. Domain Relaxation in Langmuir Films

    Bernoff, Andrew J.; Alexander, James C.; Mann, Elizabeth K.; Mann, J. Adin; Zou, Lu; Wintersmith, Jacob R.


    We report on an experimental, theoretical and computational study of a molecularly thin polymer Langmuir layer domain on the surface of a subfluid. When stretched (by a transient stagnation flow), the Langmuir layer takes the form of a bola consisting of two roughly circular reservoirs connected by a thin tether. This shape relaxes to the circular minimum energy configuration. The tether is never observed to rupture, even when it is more than a hundred times as long as it is thin. We model these experiments as a free boundary problem where motion is driven by the line tension of the domain and damped by the viscosity of the subfluid. We process the digital images of the experiment to extract the domain shape, use one of these shapes as an initial condition for the numerical solution of a boundary-integral model of the underlying hydrodynamics, and compare the subsequent images of the experiment to the numerical simulation. The numerical evolutions verify that our hydrodynamical model can reproduce the observed dynamics. They also allow us to deduce the magnitude of the line tension in the system, often to within 1%.

  15. Supervised Discrete Hashing With Relaxation.

    Gui, Jie; Liu, Tongliang; Sun, Zhenan; Tao, Dacheng; Tan, Tieniu


    Data-dependent hashing has recently attracted attention due to being able to support efficient retrieval and storage of high-dimensional data, such as documents, images, and videos. In this paper, we propose a novel learning-based hashing method called ''supervised discrete hashing with relaxation'' (SDHR) based on ''supervised discrete hashing'' (SDH). SDH uses ordinary least squares regression and traditional zero-one matrix encoding of class label information as the regression target (code words), thus fixing the regression target. In SDHR, the regression target is instead optimized. The optimized regression target matrix satisfies a large margin constraint for correct classification of each example. Compared with SDH, which uses the traditional zero-one matrix, SDHR utilizes the learned regression target matrix and, therefore, more accurately measures the classification error of the regression model and is more flexible. As expected, SDHR generally outperforms SDH. Experimental results on two large-scale image data sets (CIFAR-10 and MNIST) and a large-scale and challenging face data set (FRGC) demonstrate the effectiveness and efficiency of SDHR.

  16. Spin relaxation in organic semiconductors

    Bobbert, Peter


    Intriguing magnetic field effects in organic semiconductor devices have been reported: anomalous magnetoresistance in organic spin valves and large effects of small magnetic fields on the current and luminescence of organic light-emitting diodes. Influences of isotopic substitution on these effects points at the role of hyperfine coupling. We performed studies of spin relaxation in organic semiconductors based on (i) coherent spin precession of the electron spin in an effective magnetic field consisting of a random hyperfine field and an applied magnetic field and (ii) incoherent hopping of charges. These ingredients are incorporated in a stochastic Liouville equation for the dynamics of the spin density matrix of single charges as well as pairs of charges. For single charges we find a spin diffusion length that depends on the magnetic field, explaining anomalous magnetoresistance in organic spin valves. For pairs of charges we show that the magnetic field influences formation of singlet bipolarons, in the case of like charges, and singlet and triplet excitons, in the case of opposite charges. We can reproduce different line shapes of reported magnetic field effects, including recently found effects at ultra-small fields.

  17. Characteristics of Johari-Goldstein relaxations in bulk metallic glasses

    Qiao, Jichao; Casalini, Riccardo; Pelletier, Jean-Marc; Kato, Hidemi; Yao, Yao; Yao'S Group Team; Chemistry Division, Naval Research Laboratory Team; Pvmh, Mateis, Insa de Lyon Team; Kato'S Lab Team


    The dynamics of Pd-based metallic glasses was studied by mechanical spectroscopy and modulated differential scanning calorimetry. The results show the change in composition has a significant effect on the α relaxation dynamics. All Pd-based metallic glasses have similar fragilities, 59 < m <67, and Kohlrausch stretched exponents, 0.59 <βKWW <0.60. The values of m and βKWW correlate well with the general relation proposed by Böhmer et al. for other glassy materials and the substitution of the Ni with Cu induced a large change in the time constant of the β relaxation, τβ. The activation energy, Uβ, of the β relaxation was generally independent of chemical composition. In all cases, 25 units, Ncwere obtained; significantly larger Nc values for these metallic glasses were observed compared with glassy materials.

  18. Relaxation of a 1-D gravitational system

    Valageas, P


    We study the relaxation towards thermodynamical equilibrium of a 1-D gravitational system. This OSC model shows a series of critical energies $E_{cn}$ where new equilibria appear and we focus on the homogeneous ($n=0$), one-peak ($n=\\pm 1$) and two-peak ($n=2$) states. Using numerical simulations we investigate the relaxation to the stable equilibrium $n=\\pm 1$ of this $N-$body system starting from initial conditions defined by equilibria $n=0$ and $n=2$. We find that in a fashion similar to other long-range systems the relaxation involves a fast violent relaxation phase followed by a slow collisional phase as the system goes through a series of quasi-stationary states. Moreover, in cases where this slow second stage leads to a dynamically unstable configuration (two peaks with a high mass ratio) it is followed by a new sequence ``violent relaxation/slow collisional relaxation''. We obtain an analytical estimate of the relaxation time $t_{2\\to \\pm 1}$ through the mean escape time of a particle from its potent...

  19. Plasma Relaxation Dynamics Moderated by Current Sheets

    Dewar, Robert; Bhattacharjee, Amitava; Yoshida, Zensho


    Ideal magnetohydrodynamics (IMHD) is strongly constrained by an infinite number of microscopic constraints expressing mass, entropy and magnetic flux conservation in each infinitesimal fluid element, the latter preventing magnetic reconnection. By contrast, in the Taylor-relaxed equilibrium model all these constraints are relaxed save for global magnetic flux and helicity. A Lagrangian is presented that leads to a new variational formulation of magnetized fluid dynamics, relaxed MHD (RxMHD), all static solutions of which are Taylor equilibrium states. By postulating that some long-lived macroscopic current sheets can act as barriers to relaxation, separating the plasma into multiple relaxation regions, a further generalization, multi-relaxed MHD (MRxMHD), is developed. These concepts are illustrated using a simple two-region slab model similar to that proposed by Hahm and Kulsrud--the formation of an initial shielding current sheet after perturbation by boundary rippling is calculated using MRxMHD and the final island state, after the current sheet has relaxed through a reconnection sequence, is calculated using RxMHD. Australian Research Council Grant DP110102881.


    Oprea-Valentin BUȘU


    Full Text Available Organizational culture and organizational commitment represent two of the most important concepts to be considered în an well-functioning organization, having a direct influence over employees` lives in that company. Organizational culture, a scientific concept appeared in the field literature at the end of 1980`, in an increasingly unstable business environment, could be defined as a defined series of collective attitudes, ideas, beliefs, symbols and meanings, values and ideologies, rules and norms, feelings or behaviors, as a model and structure of stable practices shared by all the members of that organization and which, by being implemented, come to merge with the structure of organization and its control systems, with the purpose of producing behavioral norms, this way keeping  the unit of organization. In the same time, organizational commitment represents the feeling of membership, of belonging felt by the employee toward the company he/she works in, reflecting the degree to which those characteristics and organizational perspectives are internalized and adopted in his behavior by the subject. Commitment could be also seen as a model of thinking of an employee taking into consideration the level to which personal values and goals are congruent with those of the company. On the other hand, behavioral commitment refers to the process of one employee becoming committed or even stacked into the organization and the way he manage the situation. Our motivation for choosing the theme of this research lays on one hand in the desire to understand the construct of organizational culture and the organizational development, field which I`m interested in,  and on the other hand because the lack of similar research regarding the Romanian companies. The research We have made revealed that there are many studies linking the two concepts with the organizational development in companies from other countries, but only two studies realized in our country

  1. Le Chatelier's principle with multiple relaxation channels

    Gilmore, R.; Levine, R. D.


    Le Chatelier's principle is discussed within the constrained variational approach to thermodynamics. The formulation is general enough to encompass systems not in thermal (or chemical) equilibrium. Particular attention is given to systems with multiple constraints which can be relaxed. The moderation of the initial perturbation increases as additional constraints are removed. This result is studied in particular when the (coupled) relaxation channels have widely different time scales. A series of inequalities is derived which describes the successive moderation as each successive relaxation channel opens up. These inequalities are interpreted within the metric-geometry representation of thermodynamics.

  2. Neural control of muscle relaxation in echinoderms.

    Elphick, M R; Melarange, R


    Smooth muscle relaxation in vertebrates is regulated by a variety of neuronal signalling molecules, including neuropeptides and nitric oxide (NO). The physiology of muscle relaxation in echinoderms is of particular interest because these animals are evolutionarily more closely related to the vertebrates than to the majority of invertebrate phyla. However, whilst in vertebrates there is a clear structural and functional distinction between visceral smooth muscle and skeletal striated muscle, this does not apply to echinoderms, in which the majority of muscles, whether associated with the body wall skeleton and its appendages or with visceral organs, are made up of non-striated fibres. The mechanisms by which the nervous system controls muscle relaxation in echinoderms were, until recently, unknown. Using the cardiac stomach of the starfish Asterias rubens as a model, it has been established that the NO-cGMP signalling pathway mediates relaxation. NO also causes relaxation of sea urchin tube feet, and NO may therefore function as a 'universal' muscle relaxant in echinoderms. The first neuropeptides to be identified in echinoderms were two related peptides isolated from Asterias rubens known as SALMFamide-1 (S1) and SALMFamide-2 (S2). Both S1 and S2 cause relaxation of the starfish cardiac stomach, but with S2 being approximately ten times more potent than S1. SALMFamide neuropeptides have also been isolated from sea cucumbers, in which they cause relaxation of both gut and body wall muscle. Therefore, like NO, SALMFamides may also function as 'universal' muscle relaxants in echinoderms. The mechanisms by which SALMFamides cause relaxation of echinoderm muscle are not known, but several candidate signal transduction pathways are discussed here. The SALMFamides do not, however, appear to act by promoting release of NO, and muscle relaxation in echinoderms is therefore probably regulated by at least two neuronal signalling systems acting in parallel. Recently, other

  3. Stress Relaxation in Entangled Polymer Melts

    Hou, Ji-Xuan; Svaneborg, Carsten; Everaers, Ralf


    and into the terminal relaxation regime for Z=10. Using the known (Rouse) mobility of unentangled chains and the melt entanglement length determined via the primitive path analysis of the microscopic topological state of our systems, we have performed parameter-free tests of several different tube models. We find......We present an extensive set of simulation results for the stress relaxation in equilibrium and step-strained bead-spring polymer melts. The data allow us to explore the chain dynamics and the shear relaxation modulus, G(t), into the plateau regime for chains with Z=40 entanglements...

  4. Spin relaxation in nanowires by hyperfine coupling

    Echeverria-Arrondo, C. [Department of Physical Chemistry, Universidad del Pais Vasco UPV/EHU, 48080 Bilbao (Spain); Sherman, E.Ya. [Department of Physical Chemistry, Universidad del Pais Vasco UPV/EHU, 48080 Bilbao (Spain); IKERBASQUE Basque Foundation for Science, 48011 Bilbao, Bizkaia (Spain)


    Hyperfine interactions establish limits on spin dynamics and relaxation rates in ensembles of semiconductor quantum dots. It is the confinement of electrons which determines nonzero hyperfine coupling and leads to the spin relaxation. As a result, in nanowires one would expect the vanishing of this effect due to extended electron states. However, even for relatively clean wires, disorder plays a crucial role and makes electron localization sufficient to cause spin relaxation on the time scale of the order of 10 ns. (copyright 2012 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)

  5. Compact vs. Exponential-Size LP Relaxations

    Carr, R.D.; Lancia, G.


    In this paper we introduce by means of examples a new technique for formulating compact (i.e. polynomial-size) LP relaxations in place of exponential-size models requiring separation algorithms. In the same vein as a celebrated theorem by Groetschel, Lovasz and Schrijver, we state the equivalence of compact separation and compact optimization. Among the examples used to illustrate our technique, we introduce a new formulation for the Traveling Salesman Problem, whose relaxation we show equivalent to the subtour elimination relaxation.

  6. Relaxation time in disordered molecular systems

    Rocha, Rodrigo P. [Departamento de Física, Universidade Federal de Santa Catarina, 88040-900 Florianópolis-SC (Brazil); Freire, José A., E-mail: [Departamento de Física, Universidade Federal do Paraná, 81531-990 Curitiba-PR (Brazil)


    Relaxation time is the typical time it takes for a closed physical system to attain thermal equilibrium. The equilibrium is brought about by the action of a thermal reservoir inducing changes in the system micro-states. The relaxation time is intuitively expected to increase with system disorder. We derive a simple analytical expression for this dependence in the context of electronic equilibration in an amorphous molecular system model. We find that the disorder dramatically enhances the relaxation time but does not affect its independence of the nature of the initial state.

  7. Nuclear magnetic resonance relaxation in multiple sclerosis

    Larsson, H B; Barker, G J; MacKay, A


    OBJECTIVES: The theory of relaxation processes and their measurements are described. An overview is presented of the literature on relaxation time measurements in the normal and the developing brain, in experimental diseases in animals, and in patients with multiple sclerosis. RESULTS...... AND CONCLUSION: Relaxation time measurements provide insight into development of multiple sclerosis plaques, especially the occurrence of oedema, demyelination, and gliosis. There is also evidence that normal appearing white matter in patients with multiple sclerosis is affected. What is now needed are fast...

  8. 1H relaxation dispersion in solutions of nitroxide radicals: Influence of electron spin relaxation

    Kruk, D.; Korpała, A.; Kubica, A.; Kowalewski, J.; Rössler, E. A.; Moscicki, J.


    The work presents a theory of nuclear (1H) spin-lattice relaxation dispersion for solutions of 15N and 14N radicals, including electron spin relaxation effects. The theory is a generalization of the approach presented by Kruk et al. [J. Chem. Phys. 137, 044512 (2012)], 10.1063/1.4736854. The electron spin relaxation is attributed to the anisotropic part of the electron spin-nitrogen spin hyperfine interaction modulated by rotational dynamics of the paramagnetic molecule, and described by means of Redfield relaxation theory. The 1H relaxation is caused by electron spin-proton spin dipole-dipole interactions which are modulated by relative translational motion of the solvent and solute molecules. The spectral density characterizing the translational dynamics is described by the force-free-hard-sphere model. The electronic relaxation influences the 1H relaxation by contributing to the fluctuations of the inter-molecular dipolar interactions. The developed theory is tested against 1H spin-lattice relaxation dispersion data for glycerol solutions of 4-oxo-TEMPO-d16-15N and 4-oxo-TEMPO-d16-14N covering the frequency range of 10 kHz-20 MHz. The studies are carried out as a function of temperature starting at 328 K and going down to 290 K. The theory gives a consistent overall interpretation of the experimental data for both 14N and 15N systems and explains the features of 1H relaxation dispersion resulting from the electron spin relaxation.

  9. Hydrogen sulfide and vascular relaxation

    SUN Yan; TANG Chao-shu; DU Jun-bao; JIN Hong-fang


    Objective To review the vasorelaxant effects of hydrogen sulfide (H2S) in arterial rings in the cardiovascular system under both physiological and pathophysiological conditions and the possible mechanisms involved.Data sources The data in this review were obtained from Medline and Pubmed sources from 1997 to 2011 using the search terms "hydrogen sulfide" and ""vascular relaxation".Study selection Articles describing the role of hydrogen sulfide in the regulation of vascular activity and its vasorelaxant effects were selected.Results H2S plays an important role in the regulation of cardiovascular tone.The vasomodulatory effects of H2S depend on factors including concentration,species and tissue type.The H2S donor,sodium hydrosulfide (NarS),causes vasorelaxation of rat isolated aortic rings in a dose-dependent manner.This effect was more pronounced than that observed in pulmonary arterial rings.The expression of KATP channel proteins and mRNA in the aortic rings was increased compared with pulmonary artery rings.H2S is involved in the pathogenesis of a variety of cardiovascular diseases.Downregulation of the endogenous H2S pathway is an important factor in the pathogenesis of cardiovascular diseases.The vasorelaxant effects of H2S have been shown to be mediated by activation of KATP channels in vascular smooth muscle cells and via the induction of acidification due to activation of the CI/HCO3 exchanger.It is speculated that the mechanisms underlying the vasoconstrictive function of H2S in the aortic rings involves decreased NO production and inhibition of cAMP accumulation.Conclusion H2S is an important endogenous gasotransmitter in the cardiovascular system and acts as a modulator of vascular tone in the homeostatic regulation of blood pressure.

  10. Education: Commodity, Come-On, or Commitment?

    Moore, John W.


    July 4, and the glass art shown on pages 812-816, remind us that freedom is fragile. Through their governments, citizens of democracies have traditionally made strong commitments to education on grounds that without it individuals would not be able to act responsibly and to make wise decisions in voting booths and public meetings. All citizens have a stake in everyone's education, because a better-educated citizenry benefits all of society. In this country such a commitment has produced a system of public schools and public universities that offers opportunities to many who otherwise could not afford a level of education commensurate with their talents. But there are signs that this commitment to public education is flagging. Many students, teachers, and administrators view education as merely a way to enhance personal prosperity. How often have you heard the statistic that a college education pays for itself through increased earning power, even if it costs $20,000-30,000 per year? Investing in education pays off just as investing in the stock market does, provided you wait long enough. Attending a better school gets you a better job and a better income. In other words, a certified level of education is a commodity-something that is useful and can be turned to commercial advantage. Viewing education as a commodity has several consequences. First, if education is a means to better employment rather than better citizenship, why should anyone pay for it other than the person who benefits? Why should I pay taxes to help someone else get a better job when I could be spending the money for my own benefit? Education as a commodity makes such attitudes reasonable, though not commendable, and the result is lessened support for public education. Second, those who supply education as an economic good should be rewarded, and those who are much better at educating should be rewarded much more. Hence the fear of Arthur Levine, president of Teachers College, Columbia University

  11. “I think relax, relax and it flows a lot easier”: Exploring client-generated relax strategies

    Dianne Cirone


    Full Text Available Background. Some adult stroke survivors participating in Cognitive Orientation to daily Occupational Performance (CO-OP treatment programs self-generated relax strategies that have not been explored in previous CO-OP publications. The objective of this study was to describe the process by which adults with stroke used relax strategies and to explore the outcomes associated with their use. Methods. Secondary analysis of transcripts of intervention sessions from five participants was conducted. Results. All five participants applied relax strategies after initially observing a breakdown in performance that was attributed to increased fatigue or tension. The relax strategies used by the participants during their occupations included general relaxation, physical modifications to reduce tension, mental preparation, and pacing. The application of these strategies seemed to result in improved skill performance, reduced fatigue, and transfer to other activities. Conclusion. The relax strategy warrants further investigation as a potentially important therapeutic tool to improve occupational performance in individuals who have had a stroke.

  12. The Relationship between Perceived Organizational Support and Teachers' Organizational Commitment

    Nayir, Funda


    Problem Statement: It can be said that one of the key factors ensuring teachers adaptation to developments is teachers' level of commitment to their schools. In this commitment, the teacher is expected to internalize the organizational objectives. The teacher's perception of organizational support is important for him to internalize the…

  13. The Relationship between Career Growth and Organizational Commitment

    Weng, Qingxiong; McElroy, James C.; Morrow, Paula C.; Liu, Rongzhi


    This research examines the relationship between employees' career growth and organizational commitment. Career growth was conceptualized by four factors: career goal progress, professional ability development, promotion speed and remuneration growth, while organizational commitment was conceptualized using Meyer and Allen's (1997) three component…

  14. Investigation of the Relationship between Organizational Trust and Organizational Commitment

    Bastug, Gülsüm; Pala, Adem; Kumartasli, Mehmet; Günel, Ilker; Duyan, Mehdi


    Organizational trust and organizational commitment are considered as the most important entraining factors for organizational success. The most important factor in the formation of organizational commitment is trust that employees have in their organizations. In this study, the relationship between organizational trust and organizational…

  15. Impact of Satisfaction and Commitment on Teachers' Organizational Citizenship

    Sesen, Harun; Basim, Nejat H.


    This study examined the impact of job satisfaction and organizational commitment on teachers' organizational citizenship behavior (OCB) in a structural equation model. The study was employed to a group of teachers and their supervisors. The results indicated that job satisfaction and commitment to the school had an impact on OCBs of the teachers…

  16. 10 CFR 603.215 - Recipient's commitment and cost sharing.


    ... cost sharing. The purpose of cost sharing is to ensure that the recipient incurs real risk that gives... 10 Energy 4 2010-01-01 2010-01-01 false Recipient's commitment and cost sharing. 603.215 Section... AGREEMENTS Appropriate Use of Technology Investment Agreements § 603.215 Recipient's commitment and cost...

  17. Generational Differences as a Determinant of Women's Perspectives on Commitment

    Stark, Marcella D.; Kirk, Amy Manning; Bruhn, Rick


    Differences between 116 graduate and undergraduate women, representing 4 generations (i.e., Baby Boomers, Transitionals, Generation Xers, and Millennials), were studied to categorize earliest awareness and definitions of commitment in relationships. More than 63% of participants in each generation viewed relationship commitment in terms of…

  18. Qualitative and quantitative aspects of commitment development in psychology students

    Kunnen, E.S.


    We investigated the development of study- and work-related commitments in 28 psychology students during their bachelor years. Based on seven measurements of exploration and commitments (over a period of three-and-a-half years) We found the theoretically expected information-oriented, normative and d

  19. Qualitative and quantitative aspects of commitment development in psychology students

    Kunnen, E.S.

    We investigated the development of study- and work-related commitments in 28 psychology students during their bachelor years. Based on seven measurements of exploration and commitments (over a period of three-and-a-half years) We found the theoretically expected information-oriented, normative and

  20. Additively Homomorphic UC commitments with Optimal Amortized Overhead

    Cascudo Pueyo, Ignacio; Damgård, Ivan Bjerre; David, Bernardo Machado


    We propose the first UC secure commitment scheme with (amortized) computational complexity linear in the size of the string committed to. After a preprocessing phase based on oblivious transfer, that only needs to be done once and for all, our scheme only requires a pseudorandom generator...

  1. The Application of Acceptance and Commitment Therapy to Problem Anger

    Eifert, Georg H.; Forsyth, John P.


    The goal of this paper is to familiarize clinicians with the use of Acceptance and Commitment Therapy (ACT) for problem anger by describing the application of ACT to a case of a 45-year-old man struggling with anger. ACT is an approach and set of intervention technologies that support acceptance and mindfulness processes linked with commitment and…

  2. Balancing organizational and professional commitments in Professional Service Firm

    Jørgensen, Frances; Becker, Karen


    financial investment firms. Our findings suggest that in professional service firms, HR practices encourage high levels of organizational commitment primarily and most often through their influence on professional commitment and that HR practices related to flexible work design are essential in creating...

  3. Unconditionally Secure and Universally Composable Commitments from Physical Assumptions

    Damgård, Ivan Bjerre; Scafuro, Alessandra


    We present a constant-round unconditional black-box compiler that transforms any ideal (i.e., statistically-hiding and statistically-binding) straight-line extractable commitment scheme, into an extractable and equivocal commitment scheme, therefore yielding to UC-security [9]. We exemplify the u...

  4. Coming to Terms with Organizational Identification and Commitment.

    Cheney, George; Tompkins, Phillip K.


    Notes that "identification" and "commitment" appear frequently in organizational studies as ways of describing the individual's connection with the organization and argues that the concepts are distinct but interrelated. Sees identification as the substance of individual-organization relationships and commitment as the form.…

  5. Development and Evaluation of a Measure of Fear of Commitment.

    Serling, Deborah A.; Betz, Nancy E.


    Examined utility of fear of commitment in understanding differences between career undecidedness versus more complicated and chronic career indecisiveness in three studies targeting undecided and decided college students (N=707). Found fear of commitment related to state and trait anxiety, self-esteem, and was significantly higher in undecided…

  6. Employee Retention. Building Organizational Commitment. Recommendations for Nonprofit Organizations

    Paula BEUDEAN


    Full Text Available The paper provides recommendations onbuilding commitment which can be used by thenonprofit agencies that experience high personnelturnover. The recommendations are based on thetheories and research concerning retention andorganizational commitment. The study focuseson the organizational actions needed to buildcommitment and to retain employees.

  7. The Five Commitments: A Philosophical Framework Manifested through Dance

    Wakamatsu, Kori


    The philosophical framework known as the Five Commitments was recently approved by the Governing Board of the Brigham Young University-Public School Partnership. The Five Commitments consist of: Civic Preparation and Engagement; Engaged Learning Through Nurturing Pedagogy; Equitable Access to Academic Knowledge and Achievement; Stewardship in…

  8. Organisational Commitments and Teaching Styles among Academics in Mainland China

    Zhang, Li-Fang; Jing, Li-Zhen


    This research pioneered the investigation of the predictive power of organisational commitments for academics' teaching styles. Participants were 370 faculty members from 15 higher educational institutions in Beijing, the People's Republic of China. Results showed that academics' organisational commitments as measured by the Organisational…

  9. The Application of Acceptance and Commitment Therapy to Problem Anger

    Eifert, Georg H.; Forsyth, John P.


    The goal of this paper is to familiarize clinicians with the use of Acceptance and Commitment Therapy (ACT) for problem anger by describing the application of ACT to a case of a 45-year-old man struggling with anger. ACT is an approach and set of intervention technologies that support acceptance and mindfulness processes linked with commitment and…

  10. Using internal marketing to improve organizational commitment and service quality.

    Tsai, Yafang; Wu, Shih-Wang


    The purpose of this article was to explore the structural relationships among internal marketing, organizational commitment and service quality and to practically apply the findings. Internal marketing is a way to assist hospitals in improving the quality of the services that they provide while executing highly labour-intensive tasks. Through internal marketing, a hospital can enhance the organizational commitment of its employees to attain higher service quality. This research uses a cross-sectional study to survey nursing staff perceptions about internal marketing, organizational commitment and service quality. The results of the survey are evaluated using equation models. The sample includes three regional hospitals in Taiwan. Three hundred and fifty questionnaires were distributed and 288 valid questionnaires were returned, yielding a response rate of 82.3%. The survey process lasted from 1 February to 9 March 2007. The data were analysed with SPSS 12.0, including descriptive statistics based on demographics. In addition, the influence of demographics on internal marketing, organizational commitment and service quality is examined using one-way anova. The findings reveal that internal marketing plays a critical role in explaining employee perceptions of organizational commitment and service quality. Organizational commitment is the mediator between internal marketing and service quality. The results indicate that internal marketing has an impact on both organizational commitment and service quality. Internal marketing should be emphasized to influence frontline nursing staff, thereby helping to create better organizational commitment and service quality. © 2011 The Authors. Journal of Advanced Nursing © 2011 Blackwell Publishing Ltd.

  11. Organisational Commitments and Teaching Styles among Academics in Mainland China

    Zhang, Li-Fang; Jing, Li-Zhen


    This research pioneered the investigation of the predictive power of organisational commitments for academics' teaching styles. Participants were 370 faculty members from 15 higher educational institutions in Beijing, the People's Republic of China. Results showed that academics' organisational commitments as measured by the Organisational…

  12. A Longitudinal Investigation of Commitment Dynamics in Cohabiting Relationships

    Rhoades, Galena K.; Stanley, Scott M.; Markman, Howard J.


    This longitudinal study followed 120 cohabiting, opposite-sex couples over 8 months to test hypotheses derived from commitment theory about how two types of commitment (dedication and constraint) operate during cohabitation. In nearly half the couples, there were large differences between partners in terms of dedication. These differences were…

  13. Transferability of Skills and Education and Thai Academics' Organisational Commitment

    Rungruang, Parisa; Donohue, Ross


    Few studies have examined the links between perceived transferability of education or perceived transferability of skills and organisational commitment. This paper reports on a study examining the relationships between transferability of education and transferability of skills, and the three components of organisational commitment (affective,…

  14. Teachers: Emotional Intelligence, Job Satisfaction, and Organizational Commitment

    Anari, Nahid Naderi


    Purpose: The purpose of this study is to investigate the relationship between emotional intelligence and job satisfaction, between emotional intelligence and organizational commitment, and between job satisfaction and organizational commitment among high-school English teachers. Furthermore, the study aims to examine the role of gender and age in…

  15. Commitment, enjoyment and motivation in young soccer competitive players.

    Garcia-Mas, Alexandre; Palou, Pere; Gili, Margarita; Ponseti, Xavier; Borras, Pere A; Vidal, Josep; Cruz, Jaume; Torregrosa, Miquel; Villamarín, Francisco; Sousa, Catarina


    Building upon Deci's and Ryan (1985) Self-determination theory as well as the sportive behavioral correlates of the model of Commitment (Scanlan et al., 1976), this study tries to establish the relationship between motivation and commitment in youth sport. For this purpose 454 young competitive soccer players answered the Sport Motivation Scale (SMS) and the Sport Commitment Questionnaire (SCQ) during the regular season. The SMS measures the three dimensions of the Motivational continuum (the Amotivation, the Extrinsic Motivation and the Intrinsic Motivation). The SCQ measures the Sportive Commitment and its composing factors such as the Enjoyment, the Alternatives to the sport, and the Social Pressure. Our findings provided a clear pattern of the influence of motivation in sport enjoyment and commitment, outlining the positive contribution of intrinsic and extrinsic motivation to enjoyment and commitment. Amotivation, contributes positively to alternatives to sport and negatively to enjoyment and commitment, It should be noted that extrinsic motivation has a higher contribution to enjoyment whereas intrinsic motivation has a higher contribution to commitment.

  16. Unconditionally secure commitment in position-based quantum cryptography.

    Nadeem, Muhammad


    A new commitment scheme based on position-verification and non-local quantum correlations is presented here for the first time in literature. The only credential for unconditional security is the position of committer and non-local correlations generated; neither receiver has any pre-shared data with the committer nor does receiver require trusted and authenticated quantum/classical channels between him and the committer. In the proposed scheme, receiver trusts the commitment only if the scheme itself verifies position of the committer and validates her commitment through non-local quantum correlations in a single round. The position-based commitment scheme bounds committer to reveal valid commitment within allocated time and guarantees that the receiver will not be able to get information about commitment unless committer reveals. The scheme works for the commitment of both bits and qubits and is equally secure against committer/receiver as well as against any third party who may have interests in destroying the commitment. Our proposed scheme is unconditionally secure in general and evades Mayers and Lo-Chau attacks in particular.

  17. Multi-Prover Commitments Against Non-Signaling Attacks

    Fehr, S.; Fillinger, M.J.; Gennaro, R.; Robshaw, M.


    We reconsider the concept of two-prover (and more generally: multi-prover) commitments, as introduced in the late eighties in the seminal work by Ben-Or \\etal. As was recently shown by Cr{\\'e}peau \\etal., the security of known two-prover commitment schemes not only relies on the explicit assumption

  18. What Factors Influence a Teacher's Commitment to Student Learning?

    Dannetta, Vincent


    Study of the personal, organizational, student-related factors influencing teacher commitment to student learning. Finds, for example, that among personal factors intrinsic rewards are more important than extrinsic rewards, that among organization factors collegiality is an important influence on commitment to student learning, and that among…

  19. Leader-member exchange and affective organizational commitment: the contribution of supervisor's organizational embodiment.

    Eisenberger, Robert; Karagonlar, Gokhan; Stinglhamber, Florence; Neves, Pedro; Becker, Thomas E; Gonzalez-Morales, M Gloria; Steiger-Mueller, Meta


    In order to account for wide variation in the relationship between leader-member exchange and employees' affective organizational commitment, we propose a concept termed supervisor's organizational embodiment (SOE), which involves the extent to which employees identify their supervisor with the organization. With samples of 251 social service employees in the United States (Study 1) and 346 employees in multiple Portuguese organizations (Study 2), we found that as SOE increased, the association between leader-member exchange and affective organizational commitment became greater. This interaction carried through to in-role and extra-role performance. With regard to antecedents, we found in Study 1 that supervisor's self-reported identification with the organization increased supervisor's expression of positive statements about the organization, which in turn increased subordinates' SOE.

  20. Switzerland Committed to Innovation. The Swiss Network of Technology

    Konrade von Bremen


    Full Text Available

    Switzerland showed its commitment to innovation in health care since the early 80th, implementing agencies and government units with the mission to promote and to appropriately govern innovation. The Swiss Network of Technology Assessment (SNHTA was founded in 1998.

    The aim is the promotion and implementation of Health Technology Assessment projects in Switzerland by providing a neutral forum for the identification and the pursuit of common interests. This includes the coordination, exchange and dissemination of experiences of HTA projects and the implementation of the results. The collaboration in international projects is a priority. Ultimately SNHTA has the goal to improve efficacy, cost effectiveness and social accountability. An inventory survey amongst the members confirmed a high level of diverse specialised competencies, mainly employed within the institution. Only 20% of the HTA specific competencies are used for external activities.

    The need for integration of all partners in the field of innovation in a network has been recognised by the Swiss government. This lead to the creation of a webplatform in which all players involved in the business of medical technologies are involved.

    This platform (swiss medtech, includes patients, insurers, industry, universities and professional organisations. The joined activities include agreements on intellectual property and the integrated patient care chain. New ways to connect players in innovation are needed to face the challenge of increasing costs and diminishing resources.

  1. The Effect of Nurse-Physician Collaboration on Job Satisfaction, Team Commitment, and Turnover Intention in Nurses.

    Galletta, Maura; Portoghese, Igor; Carta, Mauro Giovanni; D'Aloja, Ernesto; Campagna, Marcello


    Voluntary turnover in nursing can lead to nursing shortages that affect both individuals and the entire hospital unit. We investigated the relationship between group- and individual-level variables by examining the association of nurses' job satisfaction and team commitment at the individual level, and nurse-physician collaboration at the group level, with individuals' intention to leave the unit at the individual level. A self-report questionnaire was administered to 1,024 nurses on 72 units in 3 Italian hospitals. At the individual level, affective commitment partially mediated the relationship between job satisfaction and nursing turnover intention. Moreover, a cross-level interaction was found. Nurses with high levels of job satisfaction showed high levels of identification with their team, and this relationship was stronger when the group perception of nurse-physician collaboration was high. Results suggested that managerial strategies to promote nurse-physician collaboration may be important to increase nurses' affective commitment to the team. At the individual level, job satisfaction and team affective commitment are important factors for retaining staff, and at the group level, good work collaboration with physicians is instrumental in developing nurses' affective identification with the team. © 2016 Wiley Periodicals, Inc. © 2016 Wiley Periodicals, Inc.

  2. Beyond neutrality and/or political commitment

    Roselyne Koren


    Full Text Available Cette contribution souhaite problématiser la question du devoir d’objectivité du chercheur, analyste de discours médiatiques sur le conflit israélo-palestinien. Il ne s’agit pas de contester la validité de la posture “neutre”, mais de la revisiter et de l’amender dans les cas où les corpus analysés ont des questions de vie et de mort pour objet. On soutiendra que cet amendement est rendu nécessaire pour des raisons éthiques et non pas politiques : les mots certes ne tuent pas, mais il peuvent contribuer à la légitimation de la diabolisation et de la violence mortifère ou de l’incitation à la haine. L’auteur tentera de justifier l’hypothèse suivante : l’objectivité ou au contraire l’engagement politique ne sont pas les seules options en matière de positionnement scientifique ; il en existe une troisième : l’engagement éthique explicite, justifié par un savoir scientifique.The aim of this contribution is to revisit the question of the duty of objectivity of the researcher, analyst of media discourses on the Israeli-Palestinian conflict. It is not to contest the validity of a “neutral” posture, but rather to reexamine it and to amend it in particular cases where matters of life and death are analyzed. The author shows that this amendment is necessary not for political but for ethical reasons: even if words do not kill, they can however legitimate a vilifying image of one side, while rendering acceptable deadly violence of the other and incitement to hatred.The author will try to justify the following hypothesis: objectivity or, on the contrary, political commitment, are not the only options in matter of scientific position. There exists a third option, namely an explicit ethical commitment of the researcher, supported by scientific knowledge.

  3. Nurses' perception of ethical climate and organizational commitment.

    Borhani, Fariba; Jalali, Tayebe; Abbaszadeh, Abbas; Haghdoost, Aliakbar


    The high turnover of nurses has become a universal issue. The manner in which nurses view their organization's ethical climate has direct bearing on their organizational commitment. The aim of this study was to determine the correlation between nurses' perception of ethical climate and organizational commitment in teaching hospitals in the southeastern region of Iran. A descriptive analytical design was used in this study. The sample consisted of 275 nurses working in four teaching hospitals in the southeastern region of Iran. The instruments used in this study included a demographic questionnaire, Ethical Climate Questionnaire, and Organizational Commitment Questionnaire. Data analysis was carried out using Pearson's correlation, t-test, and descriptive statistic through Statistical Package for Social Science, version 16. The result of this research indicated a positive correlation among professionalism, caring, rules, independence climate, and organizational commitment. Therefore, findings of this study are a guideline for researchers and managers alike who endeavor to improve organizational commitment.

  4. Psychopathy, criminal responsibility, and civil commitment as a sexual predator.

    Schopp, R F; Slain, A J


    Recent judicial decisions regarding commitment under sexual predator statutes and commentary addressing the legal significance of psychopathy provide an interesting opportunity to reflect upon the exculpatory significance of psychopathy and the appropriate relationship between criminal conviction and police power civil commitment. This paper examines the legal significance of psychopathy for the purposes of criminal responsibility and of civil commitment under sexual predator statutes. By examining the significance of psychopathy for each of these legal institutions, it clarifies our understanding of the legal significance of psychopathy and of the relationship between these institutions. This process illuminates the defensible functions and boundaries of each institution and clarifies the nature of the impairment that should qualify an individual for confinement by each. This analysis interprets criminal conviction and police power commitment, including sexual predator commitment, as integrated institutions of social control intended to provide a coherent approach to psychopaths as well as to others who require state intervention under the police power.

  5. On the Complexity of Additively Homomorphic UC Commitments

    Trifiletti, Roberto; Nielsen, Jesper Buus; Frederiksen, Tore Kasper


    as the commitment protocol by Garay \\emph{et al.} from Eurocrypt 2014. A main technical improvement over the scheme mentioned above, and other schemes based on using error correcting codes for UC commitment, we develop a new technique which allows to based the extraction property on erasure decoding as opposed...... transfer functionality. Based on this we prove our scheme secure in the Universal Composability (UC) framework against a static and malicious adversary corrupting any number of parties. On a practical note, our scheme improves significantly on the non- homomorphic scheme of Cascudo \\emph{et al.} Based...... on their observations in regards to efficiency of using linear error correcting codes for commit- ments we conjecture that our commitment scheme might in practice be more efficient than all existing constructions of UC commitment, even non-homomorphic constructions and even constructions in the random oracle model...

  6. Ideological commitment and posttraumatic stress in former Tamil child soldiers.

    Kanagaratnam, Pushpa; Raundalen, Magne; Asbjørnsen, Arve E


    This study focuses on the impact of present ideological commitment on posttraumatic stress symptoms in former child soldiers living in exile. Eighteen men and two women (aged 25-37), who had joined different Tamil armed groups in Sri Lanka between the ages of 13 and 17 years, participated. The Impact of Event Scale was used to measure posttraumatic symptoms. Qualitative methods were used to investigate the participants' ideological commitment. Participants reported being exposed to many potentially traumatizing events, and had high scores on the Impact of Event Scale. Twenty-five percent of the sample showed strong ideological commitment to the "cause". Ideological commitment at the present seemed to predict better mental health when exposure was less intense and overwhelming. Time had a negative impact on ideological commitment.

  7. Trust, Commitment and Competitive Advantage in SMEs Export Performance

    Md Daud Ismail


    Full Text Available The entry of small businesses into international markets has intensified. However, despite the growing presence of small businesses in international markets, studies into their international behavior, particularly regarding the effect of international relationships on international outcomes, remain limited. This study investigates the cross-border relationships of Small and Medium Enterprises (SMEs by examining the effects of the dimensions of the key relationship on the competitive advantage and performance of SMEs in export markets. These dimensions include trust and commitment. Results indicate that trust is significantly related to commitment and export performance. Commitment is positively related to competitive advantage but not to export performance. Trust affects competitive advantage through commitment. The effect of commitment on export performance is mediated by competitive advantage. The methodology and results are presented. The conclusion, implications, and limitations of this study are also discussed.

  8. Statistical Hiding Fuzzy Commitment Scheme for Securing Biometric Templates

    Alawi A. Al-Saggaf


    Full Text Available By considering the security flaws in cryptographic hash functions, any commitment scheme designed straight through hash function usage in general terms is insecure. In this paper, we develop a general fuzzy commitment scheme called an ordinary fuzzy commitment scheme (OFCS, in which many fuzzy commitment schemes with variety complexity assumptions is constructed. The scheme is provably statistical hiding (the advisory gets almost no statistically advantages about the secret message. The efficiency of our scheme offers different security assurance, and the trusted third party is not involved in the exchange of commitment.The characteristic of our scheme makes it useful for biometrics systems. If the biometrics template is compromised, then there is no way to use it directly again even in secure biometrics systems. This paper combines biometrics and OFCS to achieve biometric protection scheme using smart cards with renewability of protected biometrics template property.

  9. Some questions about complicity in the committing crimes

    Turanjanin Veljko


    Full Text Available The author in this work elaborates some problems about complicity in the committing a crimes. Criminal act is the act committed mostly by one person. But, today, there is more and more felonies which who are committing by several peoples, or groups of people. Therefore, the sanction must be more rigorous. In this article, author discussed about a one side of the complicity, accordingly, about a assistance in committing a crimes. Through analyses theoretical postulates in Codex trans aspects of some other authors till jurisprudence, the author concludes that this subject matter is very good elaborate, and, there is no many problems in practice. The author propose a harmonization of solutions on some aspects between the countries in the ambience, and demand more severe regard from court. The assistance in committing crime is the easiest shape of the complicity, but no less remarkable.

  10. Exploring commitment, professional identity, and support for student nurses.

    Clements, Andrew James; Kinman, Gail; Leggetter, Sandra; Teoh, Kevin; Guppy, Andrew


    Problems with the recruitment and retention of nurses globally mean that insight into the factors that might increase retention in qualified staff and students is crucial. Despite clear links between work commitment and retention, there is little research exploring commitment in student nurses and midwives. This paper reports the findings of a qualitative study designed to provide insight into commitment using semi-structured interviews conducted with nine pre-registration students and a qualitative survey completed by 171 pre-registration students. Thematic analysis of the data emphasised the impact of placement experiences on commitment via interpersonal relationships. Students typically emphasised their professional identity as the basis for commitment, although many participants also highlighted a lack of acceptance by qualified practitioners, which reduced it. There was evidence that suggested that practitioner workload may impact the student experience due to challenges in making sufficient time to provide support. Implications for retention strategies are discussed.

  11. Commitment to Cooperation and Peer Punishment: Its Evolution

    Tatsuya Sasaki


    Full Text Available Theoretical and empirical studies have generally weighed the effect of peer punishment and pool punishment for sanctioning free riders separately. However, these sanctioning mechanisms often pose a puzzling tradeoff between efficiency and stability in detecting and punishing free riders. Here, we combine the key aspects of these qualitatively different mechanisms in terms of evolutionary game theory. Based on the dilemmatic donation game, we introduce a strategy of commitment to both cooperation and peer punishment. To make the commitment credible, we assume that those willing to commit have to make a certain deposit. The deposit will be refunded as long as the committers faithfully cooperate in the donation game and punish free riders and non-committers. It turns out that the deposit-based commitment offers both the efficiency of peer punishment and the stability of pool punishment and that the replicator dynamics lead to transitions of different systems: pool punishment to commitment to peer punishment.

  12. Slow spin relaxation in dipolar spin ice.

    Orendac, Martin; Sedlakova, Lucia; Orendacova, Alzbeta; Vrabel, Peter; Feher, Alexander; Pajerowski, Daniel M.; Cohen, Justin D.; Meisel, Mark W.; Shirai, Masae; Bramwell, Steven T.


    Spin relaxation in dipolar spin ice Dy2Ti2O7 and Ho2Ti2O7 was investigated using the magnetocaloric effect and susceptibility. The magnetocaloric behavior of Dy2Ti2O7 at temperatures where the orientation of spins is governed by ``ice rules`` (T Tice) revealed thermally activated relaxation; however, the resulting temperature dependence of the relaxation time is more complicated than anticipated by a mere extrapolation of the corresponding high temperature data [1]. A susceptibility study of Ho2Ti2O7 was performed at T > Tice and in high magnetic fields, and the results suggest a slow relaxation of spins analogous to the behavior reported in a highly polarized cooperative paramagnet [2]. [1] J. Snyder et al., Phys. Rev. Lett. 91 (2003) 107201. [2] B. G. Ueland et al., Phys. Rev. Lett. 96 (2006) 027216.

  13. Energy landscape of relaxed amorphous silicon

    Valiquette, Francis; Mousseau, Normand


    We analyze the structure of the energy landscape of a well-relaxed 1000-atom model of amorphous silicon using the activation-relaxation technique (ART nouveau). Generating more than 40 000 events starting from a single minimum, we find that activated mechanisms are local in nature, that they are distributed uniformly throughout the model, and that the activation energy is limited by the cost of breaking one bond, independently of the complexity of the mechanism. The overall shape of the activation-energy-barrier distribution is also insensitive to the exact details of the configuration, indicating that well-relaxed configurations see essentially the same environment. These results underscore the localized nature of relaxation in this material.

  14. Precession Relaxation of Viscoelastic Oblate Rotators

    Frouard, Julien


    Various perturbations (collisions, close encounters, YORP) destabilise the rotation of a small body, leaving it in a non-principal spin state. Then the body experiences alternating stresses generated by the inertial forces. The ensuing inelastic dissipation reduces the kinetic energy, without influencing the angular momentum. This yields nutation relaxation, i.e., evolution of the spin towards rotation about the maximal-inertia axis. Knowledge of the timescales needed to damp the nutation is crucial in studies of small bodies' dynamics. In the past, nutation relaxation has been described by an empirical quality factor introduced to parameterise the dissipation rate and to evade the discussion of the actual rheological parameters and their role in dissipation. This approach is unable to describe the dependence of the relaxation rate upon the nutation angle, because we do not know the quality factor's dependence on the frequency (which is a function of the nutation angle). This leaves open the question of relax...

  15. Two-Body Relaxation in Cosmological Simulations

    Binney, J; Binney, James; Knebe, Alexander


    The importance of two-body relaxation in cosmological simulations is explored with simulations in which there are two species of particles. The cases of mass ratio sqrt(2):1 and 4:1 are investigated. Simulations are run with both a fixed softening length and adaptive softening using the publicly available codes GADGET and MLAPM, respectively. The effects of two-body relaxation are detected in both the density profiles of halos and the mass function of halos. The effects are more pronounced with a fixed softening length, but even in this case they are not so large as to suggest that results obtained with one mass species are significantly affected by two-body relaxation. The simulations that use adaptive softening are slightly less affected by two-body relaxation and produce slightly higher central densities in the largest halos. They run about three times faster than the simulations that use a fixed softening length.

  16. Structural relaxation in annealed hyperquenched basaltic glasses

    Guo, Xiaoju; Mauro, John C.; Potuzak, M.


    The enthalpy relaxation behavior of hyperquenched (HQ) and annealed hyperquenched (AHQ) basaltic glass is investigated through calorimetric measurements. The results reveal a common onset temperature of the glass transition for all the HQ and AHQ glasses under study, indicating that the primary r...... relaxation is activated at the same temperature regardless of the initial departure from equilibrium. The analysis of secondary relaxation at different annealing temperatures provides insights into the enthalpy recovery of HQ glasses.......The enthalpy relaxation behavior of hyperquenched (HQ) and annealed hyperquenched (AHQ) basaltic glass is investigated through calorimetric measurements. The results reveal a common onset temperature of the glass transition for all the HQ and AHQ glasses under study, indicating that the primary...

  17. Vibrational energy relaxation in liquid oxygen

    Everitt, K. F.; Egorov, S. A.; Skinner, J. L.


    We consider theoretically the relaxation from the first excited vibrational state to the ground state of oxygen molecules in neat liquid oxygen. The relaxation rate constant is related in the usual way to the Fourier transform of a certain quantum mechanical force-force time-correlation function. A result from Egelstaff allows one instead to relate the rate constant (approximately) to the Fourier transform of a classical force-force time-correlation function. This Fourier transform is then evaluated approximately by calculating three equilibrium averages from a classical molecular dynamics simulation. Our results for the relaxation times (at two different temperatures) are within a factor of 5 of the experimental relaxation times, which are in the ms range.

  18. Analytical representations for relaxation functions of glasses

    Hilfer, R.


    Analytical representations in the time and frequency domains are derived for the most frequently used phenomenological fit functions for non-Debye relaxation processes. In the time domain the relaxation functions corresponding to the complex frequency dependent Cole-Cole, Cole-Davidson and Havriliak-Negami susceptibilities are also represented in terms of $H$-functions. In the frequency domain the complex frequency dependent susceptibility function corresponding to the time dependent stretche...

  19. Vibrational relaxation in very high temperature nitrogen

    Hansen, C. Frederick


    Vibrational relaxation of N2 molecules is considered at temperatures up to 40,000 K in gas mixtures that contain electrons as well as heavy collision partners. The theory of vibrational relaxation due to N2-N2 collisions is fit to experimental data to 10,000 K by choice of the shape of the intermolecular potential and size of the collision cross section. These values are then used to extrapolate the theory to 40,000 K.

  20. Anomalous enthalpy relaxation in vitreous silica

    Yue, Yuanzheng


    scans. It is known that the liquid fragility (i.e., the speed of the viscous slow-down of a supercooled liquid at its Tg during cooling) has impact on enthalpy relaxation in glass. Here, we find that vitreous silica (as a strong system) exhibits striking anomalies in both glass transition and enthalpy...... the fragile ones do in a structurally independent fashion. We discuss the origin of the anomalous enthalpy relaxation in the HQ vitreous silica....

  1. Message passing with relaxed moment matching

    Qi, Yuan; Guo, Yandong


    Bayesian learning is often hampered by large computational expense. As a powerful generalization of popular belief propagation, expectation propagation (EP) efficiently approximates the exact Bayesian computation. Nevertheless, EP can be sensitive to outliers and suffer from divergence for difficult cases. To address this issue, we propose a new approximate inference approach, relaxed expectation propagation (REP). It relaxes the moment matching requirement of expectation propagation by addin...

  2. Protein dynamics from nuclear magnetic relaxation.

    Charlier, Cyril; Cousin, Samuel F; Ferrage, Fabien


    Nuclear magnetic resonance is a ubiquitous spectroscopic tool to explore molecules with atomic resolution. Nuclear magnetic relaxation is intimately connected to molecular motions. Many methods and models have been developed to measure and interpret the characteristic rates of nuclear magnetic relaxation in proteins. These approaches shed light on a rich and diverse range of motions covering timescales from picoseconds to seconds. Here, we introduce some of the basic concepts upon which these approaches are built and provide a series of illustrations.

  3. Lagrange relaxation and Dantzig-Wolfe decomposition

    Vidal, Rene Victor Valqui


    The paper concerns a large-scale linear programming problem having a block-diagonal structure with coupling constraints. It is shown that there are deep connections between the Lagrange relaxation techniques and the Dantzig-Wolfe decomposition methods......The paper concerns a large-scale linear programming problem having a block-diagonal structure with coupling constraints. It is shown that there are deep connections between the Lagrange relaxation techniques and the Dantzig-Wolfe decomposition methods...

  4. Lagrange relaxation and Dantzig-Wolfe decomposition

    Vidal, Rene Victor Valqui


    The paper concerns a large-scale linear programming problem having a block-diagonal structure with coupling constraints. It is shown that there are deep connections between the Lagrange relaxation techniques and the Dantzig-Wolfe decomposition methods......The paper concerns a large-scale linear programming problem having a block-diagonal structure with coupling constraints. It is shown that there are deep connections between the Lagrange relaxation techniques and the Dantzig-Wolfe decomposition methods...

  5. Orientational relaxation in semiflexible dendrimers.

    Kumar, Amit; Biswas, Parbati


    The orientational relaxation dynamics of semiflexible dendrimers are theoretically calculated within the framework of optimized Rouse-Zimm formalism. Semiflexibility is modeled through appropriate restrictions in the direction and orientation of the respective bond vectors, while the hydrodynamic interactions are included via the preaveraged Oseen tensor. The time autocorrelation function M(i)(1)(t) and the second order orientational autocorrelation function P(i)(2)(t) are analyzed as a function of the branch-point functionality and the degree of semiflexibility. Our approach of calculating M(i)(1)(t) is completely different from that of the earlier studies (A. Perico and M. Guenza J. Chem. Phys., 1985, 83, 3103; J. Chem. Phys., 1986, 84, 510), where the expression of M(i)(1)(t) obtained from earlier studies does not demarcate the flexible dendrimers from the semiflexible ones. The component of global motion of the time autocorrelation function exhibits a strong dependence on both degree of semiflexibility and branch-point functionality, while the component of pulsation motion depends only on the degree of semiflexibility. But it is difficult to distinguish the difference in the extent of pulsation motion among the compressed (0 qualitative behavior of P(i)(2)(t) obtained from our calculations closely matches with the expression for P(exact)(2)(t) in the earlier studies. Theoretically calculated spectral density, J(ω), is found to depend on the degree of semiflexibility and the branch-point functionality for the compressed and expanded conformations of semiflexible dendrimers as a function of frequency, especially in the high frequency regime, where J(ω) decays with frequency for both compressed and expanded conformations of semiflexible dendrimers. This decay of the spectral density occurs after displaying a cross-over behavior with the variation in the degree of semiflexibility in the intermediate frequency regime. The characteristic area increases with the

  6. Modeling of stress relaxation of a semi-crystalline multiblock copolymer and its deformation behavior.

    Yan, Wan; Fang, Liang; Heuchel, Matthias; Kratz, Karl; Lendlein, Andreas


    Stress relaxation can strongly influence the shape-memory capability of polymers. Recently a modified Maxwell-Wiechert model comprising two Maxwell units and a single spring unit in parallel has been introduced to successfully describe the shape recovery characteristics of amorphous polyether urethanes. In this work we explored whether such a modified Maxwell-Wiechert model is capable to describe the stress relaxation behavior of a semi-crystalline multiblock copolymer named PCL-PIBMD, which consists of crystallizable poly(ɛ-caprolactone) (PCL) segments and crystallizable poly(3S-isobutylmorpholine-2,5-dione) (PIBMD) segments. The stress relaxation behavior of PCL-PIBMD was explored after uniaxial deformation to different strains ranging from 50 to 900% with various strain rates of 1 or 10 or 50 mm·min -1. The modeling results indicated that under the assumption that in PCL-PIBMD both PCL and PIBMD blocks have narrow molecular weight distributions and are arranged in sequence, the two relaxation processes can be related to the amorphous PCL and PIBMD domains and the spring element can be associated to the PIBMD crystalline domains. The first Maxwell unit representing the faster relaxation process characterized by the modulus E1 and the relaxation time τ1 is related to the amorphous PCL domains (which are in the rubbery state), while the second Maxwell unit (E2 ; τ2) represents the behavior of the amorphous PIBMD domains, which are in the glassy state at 50 °C. Increasing strain rates resulted in an increase of E1 and a significant reduction in τ1, whereas the elastic modulus as well as the relaxation time related to the amorphous PIBMD domains remained almost constant. When a higher deformation was applied (ɛ ≥ 200% ) lower values for the elastic moduli of the three model elements were obtained. In general the applied model was also capable to describe the relaxation behavior of PCL-PIBMD at a deformation temperature of 20 °C, where additional crystalline

  7. Dielectric relaxation spectroscopy of phlogopite mica

    Kaur, Navjeet; Singh, Mohan; Singh, Anupinder [Department of Physics, Guru Nanak Dev University, Amritsar, Punjab 143005 (India); Awasthi, A.M. [Thermodynamics Laboratory, UGC-DAE Consortium for Scientific Research, Indore 452001 (India); Singh, Lakhwant, E-mail: [Department of Physics, Guru Nanak Dev University, Amritsar, Punjab 143005 (India)


    An in-depth investigation of the dielectric characteristics of annealed phlogopite mica has been conducted in the frequency range 0.1 Hz-10 MHz and over the temperature range 653-873 K through the framework of dielectric permittivity, electric modulus and conductivity formalisms. These formalisms show qualitative similarities in relaxation processes. The frequency dependence of the M Double-Prime and dc conductivity is found to obey an Arrhenius law and the activation energy of the phlogopite mica calculated both from dc conductivity and the modulus spectrum is similar, indicating that same type of charge carriers are involved in the relaxation phenomena. The electric modulus and conductivity data have been fitted with the Havriliak-Negami function. Scaling of M Prime , M Double-Prime , ac conductivity has also been performed in order to obtain insight into the relaxation mechanisms. The scaling behaviour indicates that the relaxation describes the same mechanism at different temperatures. The relaxation mechanism was also examined using the Cole-Cole approach. The study elaborates that the investigation regarding the temperature and frequency dependence of dielectric relaxation in the phlogopite mica will be helpful for various cutting edge applications of this material in electrical engineering.

  8. Dielectric relaxation of gamma irradiated muscovite mica

    Kaur, Navjeet [Department of Physics, Guru Nanak Dev University, Amritsar, Punjab 143005 (India); Singh, Mohan, E-mail: [Department of Physics, Guru Nanak Dev University, Amritsar, Punjab 143005 (India); Singh, Lakhwant [Department of Physics, Guru Nanak Dev University, Amritsar, Punjab 143005 (India); Awasthi, A.M. [Thermodynamics Laboratory, UGC-DAE Consortium for Scientific Research, Indore 452001 (India); Lochab, S.P. [Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067 (India)


    Highlights: • The present article reports the effect of gamma irradiation on the dielectric relaxation characteristics of muscovite mica. • Dielectric and electrical relaxations have been analyzed in the framework of dielectric permittivity, electric modulus and Cole–Cole formalisms. • The frequency dependent electrical conductivity has been rationalized using Johnsher’s universal power law. • The experimentally measured electric modulus and conductivity data have been fitted using Havriliak–Negami dielectric relaxation function. - Abstract: In the present research, the dielectric relaxation of gamma irradiated muscovite mica was studied in the frequency range of 0.1 Hz–10 MHz and temperature range of 653–853 K, using the dielectric permittivity, electric modulus and conductivity formalisms. The dielectric constants (ϵ′ and ϵ′′) are found to be high for gamma irradiated muscovite mica as compared to the pristine sample. The frequency dependence of the imaginary part of complex electric modulus (M′′) and dc conductivity data conforms Arrhenius law with single value of activation energy for pristine sample and two values of activation energy for gamma irradiated mica sample. The experimentally assessed electric modulus and conductivity information have been interpreted by the Havriliak–Negami dielectric relaxation explanation. Using the Cole–Cole framework, an analysis of real and imaginary characters of the electric modulus for pristine and gamma irradiated sample was executed which reflects the non-Debye relaxation mechanism.

  9. Rounded stretched exponential for time relaxation functions.

    Powles, J G; Heyes, D M; Rickayzen, G; Evans, W A B


    A rounded stretched exponential function is introduced, C(t)=exp{(tau(0)/tau(E))(beta)[1-(1+(t/tau(0))(2))(beta/2)]}, where t is time, and tau(0) and tau(E) are two relaxation times. This expression can be used to represent the relaxation function of many real dynamical processes, as at long times, t>tau(0), the function converges to a stretched exponential with normalizing relaxation time, tau(E), yet its expansion is even or symmetric in time, which is a statistical mechanical requirement. This expression fits well the shear stress relaxation function for model soft soft-sphere fluids near coexistence, with tau(E)Cole-Cole plots for dielectric and shear stress relaxation (both the modulus and viscosity forms). It is shown that both the dielectric spectra and dynamic shear modulus imaginary parts approach the real axis with a slope equal to 0 at high frequency, whereas the dynamic viscosity has an infinite slope in the same limit. This indicates that inertial effects at high frequency are best discerned in the modulus rather than the viscosity Cole-Cole plot. As a consequence of the even expansion in time of the shear stress relaxation function, the value of the storage modulus derived from it at very high frequency exceeds that in the infinite frequency limit (i.e., G(infinity)).

  10. Stress relaxation in viscous soft spheres.

    Boschan, Julia; Vasudevan, Siddarth A; Boukany, Pouyan E; Somfai, Ellák; Tighe, Brian P


    We report the results of molecular dynamics simulations of stress relaxation tests in athermal viscous soft sphere packings close to their unjamming transition. By systematically and simultaneously varying both the amplitude of the applied strain step and the pressure of the initial condition, we access both linear and nonlinear response regimes and control the distance to jamming. Stress relaxation in viscoelastic solids is characterized by a relaxation time τ* that separates short time scales, where viscous loss is substantial, from long time scales, where elastic storage dominates and the response is essentially quasistatic. We identify two distinct plateaus in the strain dependence of the relaxation time, one each in the linear and nonlinear regimes. The height of both plateaus scales as an inverse power law with the distance to jamming. By probing the time evolution of particle velocities during relaxation, we further identify a correlation between mechanical relaxation in the bulk and the degree of non-affinity in the particle velocities on the micro scale.

  11. On convex relaxation of graph isomorphism.

    Aflalo, Yonathan; Bronstein, Alexander; Kimmel, Ron


    We consider the problem of exact and inexact matching of weighted undirected graphs, in which a bijective correspondence is sought to minimize a quadratic weight disagreement. This computationally challenging problem is often relaxed as a convex quadratic program, in which the space of permutations is replaced by the space of doubly stochastic matrices. However, the applicability of such a relaxation is poorly understood. We define a broad class of friendly graphs characterized by an easily verifiable spectral property. We prove that for friendly graphs, the convex relaxation is guaranteed to find the exact isomorphism or certify its inexistence. This result is further extended to approximately isomorphic graphs, for which we develop an explicit bound on the amount of weight disagreement under which the relaxation is guaranteed to find the globally optimal approximate isomorphism. We also show that in many cases, the graph matching problem can be further harmlessly relaxed to a convex quadratic program with only n separable linear equality constraints, which is substantially more efficient than the standard relaxation involving n2 equality and n2 inequality constraints. Finally, we show that our results are still valid for unfriendly graphs if additional information in the form of seeds or attributes is allowed, with the latter satisfying an easy to verify spectral characteristic.

  12. WHO reaffirms commitment to women's health.

    Kirwin, S


    The World Health Organization (WHO) has reiterated its goal of reducing maternal mortality by 50% by 2000, and celebrated the 10th anniversary of its Safe Motherhood Initiative on April 7. The initiative is a coalition formed by the WHO, UNICEF, the World Bank, the UN Population Fund, and other nongovernmental organizations to encourage countries to look at the position of women in society and improve their health care. About 1600 women die every day due to complications in pregnancy and childbirth, mostly in Asia and Africa. Of all the health statistics monitored by the WHO, maternal mortality is the one with the largest discrepancy between developed and developing countries; the level of maternal mortality in the developing world is almost 18 times higher than that in the developed world and up to one third of all deaths among women of reproductive age in many developing countries are the result of complications of pregnancy or childbirth. The WHO claims that providing care from conception to delivery, including family planning and neonatal care, would cost only about $3 per woman, an important social and economic investment. China, Sri Lanka, Iran, and Cuba have had considerable success in reducing their levels of maternal mortality through a combination of commitment to the initiative and improved health care.

  13. Sustainable human development: an educational commitment



    Full Text Available Sustainable Human Development (hereafter SHD is taking shape as a proposal for progress in the face of a crisis in civilization so complex and far-reaching that it is considered quite difficult to solve. The aim of this article is to offer a reasoned justification of the evolution of the concept of development and of the need for an educational commitment to be able to make progress towards it. Although it is still polemical and the object of criticism, SHD has become consolidated as a strongly ethical proposal to lead the change in the course of development, transversally affecting its multiple dimensions and advocating interdisciplinary and intercultural cooperation and dialogue. The article analyses the challenges posed by SHD to today’s global society, as well as some ways to respond to them from the field of educational action and research. It concludes with a reasoned structuring of the contents of the monograph and an analytical description of the contents of the different contributions.

  14. Facility's employment practices reflect affirmative action commitment.

    Glaser, J W; Madden, M J


    The U.S. bishops' statements on racism over the last 40 years have addressed the structural as well as the personal aspects of racial discrimination. They have noted its persistence, described it as a moral and religious problem, and called for aggressive action among Catholics to combat it. "Meaningful equality" for blacks, however, remains a distant dream, the U.S. Supreme Court noted in a recent case involving institutional discrimination, because of the basically disadvantaged position into which blacks are born. As statistics on health, education, work, and standard of living illustrate, the socioeconomic opportunities available to blacks are markedly lower than those available to white Americans. Despite these odds, efforts to improve blacks' chances of contributing to society--through affirmative action programs--have achieved striking results in industry. Hospitals, as major workplaces, likewise should focus greater attention on developing and extending minority employment and advancement programs. Catholic health care facilities especially should evaluate their commitments to affirmative action. Increased efforts to eliminate discrimination in all aspects of a hospital's relationships with the business community as well as with its own employees will cause them to be recognized as symbols of justice not only in the workplace but also in society.

  15. CERN Confirms commitment to Open Access


    The CERN Library Information desk.At a meeting on the Wednesday before Easter, the Executive Committee endorsed a policy of open access to all the laboratory's results, as expressed in the document ‘Continuing CERN action on Open Access' (, released by its Scientific Information Policy Board (SIPB) earlier in the month. "This underlines CERN's commitment to sharing the excitement of fundamental research with as wide an audience as possible", said Guido Altarelli, current SIPB chairman. Open Access to scientific knowledge is today the goal of an increasing component of the worldwide scientific community. It is a concept, made possible by new electronic tools, which would bring enormous benefits to all readers by giving them free access to research results. CERN has implicitly supported such moves from its very beginning. Its Convention (, adopted in 1953, requires openness, stipulating that "......

  16. Relationship of High School Principal Organizational Commitment and Campus Academic Performance

    Edison, David Allen


    The purpose of the study was to explore the relationship of Texas high school principals' organizational commitment and the academic performance of the high schools served by the principals. Three components of principal organizational commitment--affective commitment, continuance commitment, and normative commitment--were assessed using the…

  17. Space and time dynamical heterogeneity in glassy relaxation. The role of democratic clusters

    Appignanesi, G A; Rodriguez Fris, J A [Fisicoquimica, Departamento de Quimica, Universidad Nacional del Sur, Avenida Alem 1253, 8000 BahIa Blanca (Argentina); Seccion de Fisicoquimica, Instituto de Quimica de la Universidad Nacional del Sur, INQUISUR-UNS-CONICET, Universidad Nacional del Sur, Avenida Alem 1253, 8000 BahIa Blanca (Argentina)], E-mail:


    In this work we review recent computational advances in the understanding of the relaxation dynamics of supercooled glass-forming liquids. In such a supercooled regime these systems experience a striking dynamical slowing down which can be rationalized in terms of the picture of dynamical heterogeneities, wherein the dynamics can vary by orders of magnitude from one region of the sample to another and where the sizes and timescales of such slowly relaxing regions are expected to increase considerably as the temperature is decreased. We shall focus on the relaxation events at a microscopic level and describe the finding of the collective motions of particles responsible for the dynamical heterogeneities. In so doing, we shall demonstrate that the dynamics in different regions of the system is not only heterogeneous in space but also in time. In particular, we shall be interested in the events relevant to the long-time structural relaxation or {alpha} relaxation. In this regard, we shall focus on the discovery of cooperatively relaxing units involving the collective motion of relatively compact clusters of particles, called 'democratic clusters' or d-clusters. These events have been shown to trigger transitions between metabasins of the potential energy landscape (collections of similar configurations or structures) and to consist of the main steps in the {alpha} relaxation. Such events emerge in systems quite different in nature such as simple model glass formers and supercooled amorphous water. Additionally, another relevant issue in this context consists in the determination of a link between structure and dynamics. In this context, we describe the relationship between the d-cluster events and the constraints that the local structure poses on the relaxation dynamics, thus revealing their role in reformulating structural constraints. (topical review)

  18. The Relationship between Organizational Commitment and Organizational Trust of Staff

    Marziyeh Alijanpour


    Full Text Available The present study aimed at investigating the relationship between organizational trust and organizational commitment in staff. Eighty-four persons from 101 staff of department of Sports and Youth in the province of Mazandaran responded to two questionnaires of “Organizational Trust Inventory (OTI” developed by Shockley-Zalaba, Ellis, and Winograd (2000 and “Organizational Commitment Questionnaire (OCQ” developed by Allen and Meyer (1990. The reliability analysis of questionnaires for OTI, and OCQ were reported ɑ = 0.92 and ɑ = 0.82, respectively based on Cronbach's alpha measure. Results revealed that there is a positive and significant relationship between organizational trust and organizational commitment (r = 0.573, p = 0.001, affective commitment (r = 0.54, p = 0.001, task commitment is (r = 0.345, p = 0.001. But the positive relationship between organizational trust and continuous commitment (r = 0.202 wasn’t significant (p = 0.066. In conclusion, it is suggested that managers should create trust of staff in order to increase its organizational commitment.


    Silvija Vig


    Full Text Available The article investigates the relationship between commitment to business ethics and nonfinancial business performance. Data of commitment to business ethics and nonfinancial business performance were collected from 100 participants through a questionnaire survey. The survey was conducted in 2015 in Croatian large and medium sized companies. The questionnaire for assessing commitment to business ethics contained nine different dimensions while the nonfinancial business performance contained three dimensions: client satisfaction, human resource management plus innovativeness and efficiency of business processes. Multiple regression methods were applied in the analysis. The empirical results of three multiple linear regression models show that certain dimension of commitment to business ethics had a positive influence on the nonfinancial performance of the companies. Motivation and rewarding policy for ethical behavior and responding to unethical behavior, as a dimension of commitment to business ethics, has distinctive effects on all three nonfinancial performance dimensions. It was also found that selecting suppliers based on the standards of ethics and compliance has a positive and strong influence on client satisfaction while using ethical criteria in the performance and efficiency evaluation of employees has a positive and significant influence on innovativeness and efficiency of business processes. This research leads to the conclusion that some dimensions of commitment to business ethics can be important predictors of nonfinancial business performance. Therefore, results of the research could be considered as valid motivation for further improvement of commitment to ethics in the business environment.

  20. Concept analysis of professional commitment in Iranian nurses

    Jafaragaee, Fateme; Parvizy, Soroor; Mehrdad, Neda; Rafii, Forough


    Aim: Professional commitment has been widely discussed during the last decade. There is no comprehensive definition about “professional commitment in Iranian nurses.” Hence, this study was conducted with the aim of analyzing the concept of professional commitment in Iranian nurses. Materials and Methods: Hybrid model was used in three phases. Firstly, in the theoretical phase, data were retrieved from the CINHAl, MEDLINE, PubMed, OVID, Google scholar, and SID databases. The literature search used the keywords “professional commitment” and “nursing.” The final sample included 27 papers published in English between 2001 and 2011.Secondly, in the fieldwork phase, deep interviews with five clinical nurses were carried out, and thirdly, in the final analytical phase, the obtained data from theoretical and fieldwork phases were combined and a comprehensive analysis was conducted. Results: Loyalty and tendency to remain in the profession and responsibility to the professional issues were extracted in theoretical phase. Commitment to promote caring abilities, satisfying of being a nurse, and belonging to the nursing profession were obtained in fieldwork phase. Finally, two main themes including “commitment to offering the best nursing care” and “commitment to promotion of the nursing profession” were extracted. Conclusion: Nursing is a humanistic profession; it has some particular characteristics due to the profession’s nature. In this paper, a definition composed of two main dimensions of professional commitment in nursing has been introduced. PMID:23922592

  1. Internet Pornography Consumption and Relationship Commitment of Filipino Married Individuals

    Racidon P. Bernarte


    Full Text Available Internet pornography has many adverse effects, especially to the relationship commitment. The use of pornography directly correlates to a decrease in sexual intimacy. Hence, this might lead to weakening of the relationship of their partner. To find out the relevance of the claim, the researchers aimed to explore the relationship of Internet pornography consumption to the relationship commitment of married individuals in the Philippines. Different factors such as level of satisfaction, investment, quality of alternatives, relationship stability and viewing habits were also considered in determining the relationship of watching online pornography and the relationship commitment of Filipino married individuals. The study used the descriptive-correlational design. A self-administered survey was distributed to 400.It is revealed that Internet pornography consumption has an adverse effect on the relationship commitment of married Filipino couples. Furthermore, watching porn online weakened the relationship commitment that leads to an unstable relationship. This investigation found out that internet pornography consumption has a nominal negative effect on the relationship commitment of Filipino married individuals. It is proven on this study that internet pornography consumption can weaken the relationship commitment of married individuals thus, it promotes knowledge about numerous effect of it, negatively and even positively. This paper also contributes to pornography related researches on the country which can give further awareness about the said area.

  2. The interplay between organizational commitment and personal values

    Alicia Omar


    Full Text Available The study of employee’s commitment is capturing the attention of managers and researchers. Besides being one of the most effective alternatives for achieving the organizational goals, the importance of organizational commitment (OC lies in its ability to influence the efficiency and the wellbeing of members of an organization. The article examines the relationships between personal values and components of OC. Participants were selected from twelve Argentinean organizations. Subjects completed a questionnaire of personal data, and two scales to measure individualism- collectivism (vertical and horizontal, and organizational commitment, respectively. All subjects were classified into eight subgroups, after dichotomizing by median each dimensions of values (HI: horizontal individualism; VI: vertical individualism; HC: horizontal collectivism, and HV: vertical collectivism. The four most representative subgroups (N= 162 were selected, that is, who exhibited high scores in one of the four dimensions and lows in the remaining three. In such subgroups were calculated analysis of variance, post-hoc comparison tests, and correlation analysis. The more significant findings can be summarized in the following items: a collectivists (HC or VC show a higher level of affective commitment, while individualists relate to their companies through normative or continuance commitment; b women and senior employees exhibit greater levels of affective and normative commitment; c managers, employees with higher academic degree, and employees of large companies, feel attached to their organizations through normative commitment; d continuance commitment seems to work differently than affective and normative commitment because it has no associations with any of the socio-demographic variables studied. Strengths and limitations of the study are discussed, and suggestions are made for future research. 

  3. United States Food Loss and Waste 2030 Champions

    U.S. Food Loss and Waste 2030 Champions are businesses and organizations that have made a public commitment to reduce food loss and waste in their own operations in the United States by 50 percent by the year 2030.

  4. Employee organizational commitment and hospital performance.

    Baird, Kevin M; Tung, Amy; Yu, Yanjie


    There is widespread evidence of the purported benefits of employee organizational commitment (EOC) and its impact on both individual and organizational performance. This study contributes to this literature by providing a unique insight into this relationship, focusing on the interrelationship between EOC with hospital performance and the role of the provision of adequate facilities in eliciting EOC. The aim of this study was to introduce and empirically examine a new theoretical model in which it is argued that the performance of hospitals with regard to the provision of adequate facilities (medical facilities, support facilities, and staff resources) influences the level of EOC, which in turn influences hospital performance with regard to patient care and operational effectiveness. To examine the interrelationships between the provision of adequate facilities, EOC, and hospital performance, the study utilizes a survey of hospital managers. The findings support the theoretical model, with the provision of support facilities and staff resources positively indirectly associated with both patient care and operational effectiveness through their impact on EOC. The findings highlight the importance of providing adequate facilities and EOC within hospitals and suggest that CEOs and general managers should try to enhance the provision of such resources in an attempt to elicit EOC within their hospitals. The findings suggest that managers should try to enhance their provision of adequate facilities in order to elicit EOC and enhance hospital performance. With regard to medical facilities, they should consider and incorporate the latest technology and up-to-date equipment. They should also provide adequate staff resources, including appropriate numbers of beds, nurses, and doctors, to prevent "fatigue" (West, 2001, p. 41) and provide adequate support facilities.

  5. Intestinal lineage commitment of embryonic stem cells.

    Cao, Li; Gibson, Jason D; Miyamoto, Shingo; Sail, Vibhavari; Verma, Rajeev; Rosenberg, Daniel W; Nelson, Craig E; Giardina, Charles


    Generating lineage-committed intestinal stem cells from embryonic stem cells (ESCs) could provide a tractable experimental system for understanding intestinal differentiation pathways and may ultimately provide cells for regenerating damaged intestinal tissue. We tested a two-step differentiation procedure in which ESCs were first cultured with activin A to favor formation of definitive endoderm, and then treated with fibroblast-conditioned medium with or without Wnt3A. The definitive endoderm expressed a number of genes associated with gut-tube development through mouse embryonic day 8.5 (Sox17, Foxa2, and Gata4 expressed and Id2 silent). The intestinal stem cell marker Lgr5 gene was also activated in the endodermal cells, whereas the Msi1, Ephb2, and Dcamkl1 intestinal stem cell markers were not. Exposure of the endoderm to fibroblast-conditioned medium with Wnt3A resulted in the activation of Id2, the remaining intestinal stem cell markers and the later gut markers Cdx2, Fabp2, and Muc2. Interestingly, genes associated with distal gut-associated mesoderm (Foxf2, Hlx, and Hoxd8) were also simulated by Wnt3A. The two-step differentiation protocol generated gut bodies with crypt-like structures that included regions of Lgr5-expressing proliferating cells and regions of cell differentiation. These gut bodies also had a smooth muscle component and some underwent peristaltic movement. The ability of the definitive endoderm to differentiate into intestinal epithelium was supported by the vivo engraftment of these cells into mouse colonic mucosa. These findings demonstrate that definitive endoderm derived from ESCs can carry out intestinal cell differentiation pathways and may provide cells to restore damaged intestinal tissue.

  6. Earth system commitments due to delayed mitigation

    Pfister, Patrik L.; Stocker, Thomas F.


    As long as global CO2 emissions continue to increase annually, long-term committed Earth system changes grow much faster than current observations. A novel metric linking this future growth to policy decisions today is the mitigation delay sensitivity (MDS), but MDS estimates for Earth system variables other than peak temperature (ΔT max) are missing. Using an Earth System Model of Intermediate Complexity, we show that the current emission increase rate causes a ΔT max increase roughly 3-7.5 times as fast as observed warming, and a millenial steric sea level rise (SSLR) 7-25 times as fast as observed SSLR, depending on the achievable rate of emission reductions after the peak of emissions. These ranges are only slightly affected by the uncertainty range in equilibrium climate sensitivity, which is included in the above values. The extent of ocean acidification at the end of the century is also strongly dependent on the starting time and rate of emission reductions. The preservable surface ocean area with sufficient aragonite supersaturation for coral reef growth is diminished globally at an MDS of roughly 25%-80% per decade. A near-complete loss of this area becomes unavoidable if mitigation is delayed for a few years to decades. Also with respect to aragonite, 12%-18% of the Southern Ocean surface become undersaturated per decade, if emission reductions are delayed beyond 2015-2040. We conclude that the consequences of delaying global emission reductions are much better captured if the MDS of relevant Earth system variables is communicated in addition to current trends and total projected future changes.

  7. The use of (double) relaxation oscillation SQUIDs as a sensor

    Duuren, van M.J.; Brons, G.C.S.; Kattouw, H.; Flokstra, J.; Rogalla, H.


    Relaxation Oscillation SQUIDs (ROSs) and Double Relaxation Oscillation SQUIDs (DROSs) are based on relaxation oscillations that are induced in hysteretic dc SQUIDs by an external L-R shunt. The relaxation frequency of a ROS varies with the applied flux Φ, whereas the output of a DROS is a dc voltage

  8. The use of (double) relaxation oscillation SQUIDs as a sensor

    van Duuren, M.J.; Brons, G.C.S.; Kattouw, H.; Flokstra, Jakob; Rogalla, Horst


    Relaxation Oscillation SQUIDs (ROSs) and Double Relaxation Oscillation SQUIDs (DROSs) are based on relaxation oscillations that are induced in hysteretic dc SQUIDs by an external L-R shunt. The relaxation frequency of a ROS varies with the applied flux Φ, whereas the output of a DROS is a dc


    Zhong Ming; Yang Yixian


    Recently, many bit commitment schemes have been presented. This paper presents a new practical bit commitment scheme based on Schnorr's one-time knowledge proof scheme,where the use of cut-and-choose method and many random exam candidates in the protocols are replaced by a single challenge number. Therefore the proposed bit commitment scheme is more efficient and practical than the previous schemes In addition, the security of the proposed scheme under factoring assumption is proved, thus the cryptographic basis of the proposed scheme is clarified.

  10. The measurement artifact in the Organizational Commitment Questionnaire.

    Caught, K; Shadur, M A; Rodwell, J J


    This study empirically examined the debate in the literature regarding the dimensionality of the Organizational Commitment Questionnaire. The sample comprised 803 employees from organizations in the information technology and hospitality industries. Confirmatory factor analysis showed that the Organizational Commitment Questionnaire appears to have a two-factor structure, with one factor consisting of positively worded items and the other factor, negatively worded items. Scores on both factors correlated significantly with job satisfaction, suggesting that both factors appear to be measuring a similar aspect of organizational commitment and that they present as two factors given as measurement artifacts of the item wording.

  11. Relationship between sport commitment and sport consumer behavior

    Norberta Elisa Fernandes


    Full Text Available The purpose of this study was to examine the relationships between sport commitment and three types of sport consumer behaviors: participation frequency, sporting goods and media consumption. A survey was conducted among sport participants of both individual and team sports, fitness and outdoor activities (n= 900. The survey included questions related to demographic information, measures of sport commitment and sport consumption behavior. The results analyzed trough structural equation modeling showed that the sport commitment influences positively the participation frequency, sporting goods consumption and media consumption. Implications of these results are discussed and suggestions for future research on sport consumers are provided.

  12. Conceptual Approach to the Organizational Trust Building in Commitment Perspective

    Mustafa Emre CİVELEK


    Full Text Available Trust is a psychological factor that is the premise of social relations. The trust level in a country is connected with the culture and forms the social capital. Organizational trust may be defined that the employees don’t require protecting themselves against the policies of organization which would affect them. Organizational commitment is defined that the employees internalize the organization values and creating the will of staying in the organization. The trust is considered as the most important premise of commitment. In this study the conceptual approach is developed how the organizational trust would be built in the commitment perspective.

  13. Time scales of relaxation dynamics during transient conditions in two-phase flow: RELAXATION DYNAMICS

    Schlüter, Steffen [School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis Oregon USA; Department Soil Physics, Helmholtz-Centre for Environmental Research-UFZ, Halle Germany; Berg, Steffen [Shell Global Solutions International B.V., Rijswijk Netherlands; Li, Tianyi [School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis Oregon USA; Vogel, Hans-Jörg [Department Soil Physics, Helmholtz-Centre for Environmental Research-UFZ, Halle Germany; Institut für Agrar- und Ernährungswissenschaften, Martin-Luther-Universität Halle-Wittenberg, Halle Germany; Wildenschild, Dorthe [School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis Oregon USA


    The relaxation dynamics toward a hydrostatic equilibrium after a change in phase saturation in porous media is governed by fluid reconfiguration at the pore scale. Little is known whether a hydrostatic equilibrium in which all interfaces come to rest is ever reached and which microscopic processes govern the time scales of relaxation. Here we apply fast synchrotron-based X-ray tomography (X-ray CT) to measure the slow relaxation dynamics of fluid interfaces in a glass bead pack after fast drainage of the sample. The relaxation of interfaces triggers internal redistribution of fluids, reduces the surface energy stored in the fluid interfaces, and relaxes the contact angle toward the equilibrium value while the fluid topology remains unchanged. The equilibration of capillary pressures occurs in two stages: (i) a quick relaxation within seconds in which most of the pressure drop that built up during drainage is dissipated, a process that is to fast to be captured with fast X-ray CT, and (ii) a slow relaxation with characteristic time scales of 1–4 h which manifests itself as a spontaneous imbibition process that is well described by the Washburn equation for capillary rise in porous media. The slow relaxation implies that a hydrostatic equilibrium is hardly ever attained in practice when conducting two-phase experiments in which a flux boundary condition is changed from flow to no-flow. Implications for experiments with pressure boundary conditions are discussed.

  14. Anomalous Enthalpy Relaxation in Vitreous Silica

    Yuanzheng eYue


    Full Text Available It is a challenge to calorimetrically determine the glass transition temperature (Tg of vitreous silica. Here we demonstrate that this challenge mainly arises from the extreme sensitivity of the Tg to the hydroxyl content in vitreous silica, but also from the irreversibility of its glass transition when repeating the calorimetric scans. It is known that the liquid fragility (i.e., the speed of the viscous slow-down of a supercooled liquid at its Tg during cooling has impact on enthalpy relaxation in glass. Here we find that vitreous silica (as a strong system exhibits striking anomalies in both glass transition and enthalpy relaxation compared to fragile oxide systems. The anomalous enthalpy relaxation of vitreous silica is discovered by performing the hperquenching-annealing-calorimetry experiments. We argue that the strong systems like vitreous silica and vitreous Germania relax in a structurally cooperative manner, whereas the fragile ones do in a structurally independent fashion. We discuss the origin of the anomalous enthalpy relaxation in the HQ vitreous silica.

  15. Motional Spin Relaxation in Large Electric Fields

    Schmid, Riccardo; Filippone, B W


    We discuss the precession of spin-polarized Ultra Cold Neutrons (UCN) and $^{3}\\mathrm{He}$ atoms in uniform and static magnetic and electric fields and calculate the spin relaxation effects from motional $v\\times E$ magnetic fields. Particle motion in an electric field creates a motional $v\\times E$ magnetic field, which when combined with collisions, produces variations of the total magnetic field and results in spin relaxation of neutron and $^{3}\\mathrm{He}$ samples. The spin relaxation times $T_{1}$ (longitudinal) and $T_{2}$ (transverse) of spin-polarized UCN and $^{3}\\mathrm{He}$ atoms are important considerations in a new search for the neutron Electric Dipole Moment at the SNS \\emph{nEDM} experiment. We use a Monte Carlo approach to simulate the relaxation of spins due to the motional $v\\times E$ field for UCN and for $^{3}\\mathrm{He}$ atoms at temperatures below $600 \\mathrm{mK}$. We find the relaxation times for the neutron due to the $v\\times E$ effect to be long compared to the neutron lifetime, ...

  16. Doppler effect induced spin relaxation boom

    Zhao, Xinyu; Huang, Peihao; Hu, Xuedong


    We study an electron spin qubit confined in a moving quantum dot (QD), with our attention on both spin relaxation, and the product of spin relaxation, the emitted phonons. We find that Doppler effect leads to several interesting phenomena. In particular, spin relaxation rate peaks when the QD motion is in the transonic regime, which we term a spin relaxation boom in analogy to the classical sonic boom. This peak indicates that a moving spin qubit may have even lower relaxation rate than a static qubit, pointing at the possibility of coherence-preserving transport for a spin qubit. We also find that the emitted phonons become strongly directional and narrow in their frequency range as the qubit reaches the supersonic regime, similar to Cherenkov radiation. In other words, fast moving excited spin qubits can act as a source of non-classical phonons. Compared to classical Cherenkov radiation, we show that quantum dot confinement produces a small but important correction on the Cherenkov angle. Taking together, these results have important implications to both spin-based quantum information processing and coherent phonon dynamics in semiconductor nanostructures.

  17. China Firmly Committed to Low Carbon Economy


    @@ The creation of a "low carbon" economy that will provide jobs and clean up industry is now a crucial policy objective for countries trying to spend their way out of the world economic downturn. A recent report by HSBC calculates that the United States is allocating 12 per cent of its fiscal stimulus to the green economy and China, 34per cent.

  18. Islamic Counselling Model to Increase Religious Commitment (Study of Students at the University UIN Bandung

    Fenti Hikmawati


    Full Text Available The study aims to test the effectiveness of Islamic counseling model for helping the students to tight their religious commitment. The religious commitment is covered in three major Islamic teachings: Iman (faith, Islam (surrender to Allah, and lhsan (state of being observed by Allah. The model of Islamic counseling aims to tight students' religious commitment must to be applied immediately because the preface study reveals some students' religious commitment were not strong enough, their behavior and thinking symptoms tend to not appropriate yet with Islam norm among their association and conception toward the truth of God. To achieve the aim, the study was carried out with three steps: (1 designing a model of counseling; (2 trying out field study, using pretest-post test control group experimental design with 140 students of Islamic Religion Education, the Faculty of Tarbiyah and Teaching, State Islamic University, Sunan Gunung Djati, Bandung. Of 140 students, 70 students are from the classes: A (32 people, B (38 people, involved in control group and the test; 37 people from class C, and 33 students from class D involved in the experiment group, and; (3 designing a final model by revising the model tried-out. The variable involved three major Islamic dimensions: the iman, Islam, and ihsan of the students. The model was designed based on the theory put forward by Musfir bin Said Az-Zalmmi, that is, an integrated counseling model. The model combines and employs the ideas from other concepts into a tightly united concept, called Islamic concept. Upon completing analysis, it was found that the new concept is significantly effective to enhance students' religious commitment. A Model of Islamic Counseling (MIC is an alternative-counseling model that can be employed for teenagers/ students to enhance their religious commitment. The study recommends that: (1 MIC can be applied to fifth semester students in the Faculty of Tarbiyah State Islamic

  19. Impact of organizational justice on satisfaction, commitment and turnover intention: Can fair treatment by organizations make a difference in their workers’ attitudes and behaviors?

    Gauri S. Rai


    Full Text Available This study investigated the impact of organizational justice on specific attitudes and behaviors such as job satisfaction, organizational commitment and turnover intention. The data were collected from 511 staff members from ten health and rehabilitation centers in a southern state in the United States. Pearson Correlations and Hierarchical Regression were used to analyze data. The findings revealed that distributive justice influenced job satisfaction, organizational commitment and turnover intentions. Procedural justice is only associated with organizational commitment. Informational justice affected only job satisfaction. Interpersonal justice was not related to any attitude or behavior included in this study. These findings suggest that if organizations want to improve job satisfaction and organizational commitment while reducing turnover intention, they need to pay more attention to developing programs and policies as well as leadership styles that encourage fairness.

  20. Age-specific radiation dose commitment factors for a one-year chronic intake

    Hoenes, G.R.; Soldat, J.K.


    During the licensing process for nuclear facilities, radiation doses and dose commitments must be calculated for people in the environs of a nuclear facility. These radiation doses are determined by examining characteristics of population groups, pathways to people, and radionuclides found in those pathways. The pertinent characteristics, which are important in the sense of contributing a significant portion of the total dose, must then be analyzed in depth. Dose factors are generally available for adults, see Reference 1 for example, however numerous improvements in data on decay schemes and half-lives have been made in recent years. In addition, it is advisable to define parameters for calculation of the radiation dose for ages other than adults since the population surrounding nuclear facilities will be composed of various age groups. Further, since infants, children, and teens may have higher rates of intake per unit body mass, it is conceivable that the maximally exposed individual may not be an adult. Thus, it was necessary to develop new radiation-dose commitment factors for various age groups. Dose commitment factors presented in this report have been calculated for a 50-year time period for four age groups.