Open System Model Research Articles

Systems Modelling of Steering System using OpenModelica

Steering system is one of the key vehicle-driver interface that impacts driving fatigue and perception of quality by driver. It is also a safety critical system governed by several Homologation requirements. While Homologation rules mandates the steering effort to be within certain limits, for a driver, asymmetric behavior in terms of angle & torque between LH & RH turn is also undesirable. The sub-attributes are affected indirectly by packaging constraints in each vehicle platform and model. For meeting the stringent targets in each variant and to maintain minimal unique parts, several design iterations would be needed. Physical testing involves higher cost and time. Hence development of a steering system simulation model becomes essential. This paper details the development of a steering model to simulate and analyze the steering system performance of commercial vehicles. A single steer model with hydraulic assistance is developed using OpenModelica (OM), an open source system modelling software. The parameters such as steering wheel effort, wheel lock angles, Ackermann error and Turning circle diameter (TCD) are computed along with prediction of dry park effort. Based on iterations, an optimized configuration with reduced asymmetry can be derived.

Open-system 182W[sbnd]142Nd isotope evolution of the Earth

We present a five-reservoir open-system model for the 182Hf182W and 146Sm142Nd isotope evolution of the Earth to constrain early mantle-crust exchange and late accretion processes. In the presented model, core formation is complete within 30–100 Myr after solar system formation. The complementary bulk silicate Earth (BSE) differentiates to form a continental crust (CC), an incompatible element depleted upper mantle (UM), an initially primitive but continuously evolving lower mantle (LM), and an isolated reservoir (IR) where the recycled crust is stored before mixing into the LM. In our default model, late accretion adds bulk Earth-like material to the mantle after core formation, concurrent to progressive silicate differentiation. The 182W and 142Nd isotope evolution in each reservoir is calculated with a series of differential equations that compute the changing abundance of each isotope from the start of solar system evolution (t = 4.56 Ga) to the present (t = 0 Ga). Core formation, by far, has the greatest influence on the 182Hf182W isotopic evolution of the bulk silicate Earth (BSE). It determines the ∼200 ppm offset between BSE's μ182W (μ182WBSE ∼ 0) and chondrites (μ182Wchondrite ∼ −200 ppm), whereas late accretion adds ∼10% of BSE's W which changes μ182WBSE by only ∼several 10s ppm. Most compatible with the modeled 182W evolution and W content of the silicate Earth are core formation processes lasting until ∼45–60 Myr after solar system initial and subsequent addition of about 1.0–0.5% late accreted material to Earth's mantle. However, both the pre-late accretion μ182W and W content of the BSE depend strongly on the rate and duration of core formation and ultimately determine the amount and type of late accreted material necessary to evolve to the present μ182WBSE ∼ 0, or any other value slightly higher or lower. Because tight constraints on the timing and rate of core formation during accretion are still lacking, the trade-off between core formation processes and the effects of late accretion on BSE's 182W evolution remains grossly under-constrained, making the μ182W evolution of Earth's mantle-crust system similarly under-determined. Nevertheless, robust constraints are that heterogeneous distribution of the late accreted material to Earth's mantle in combination with Hadean crust formation and recycling is required to form a mantle reservoir with a small range of 182W excesses between 10 and 15 ppm throughout the Archean, as observed in most Archean rocks. Reproducing the observed 142Nd and 182W signatures in Hadean-Eoarchean mantle-derived rocks with our model further requires that continental crust formation starts within the first ∼50 Myr after core formation. Continuous exchange between the crust and the different mantle reservoirs in our model leads to post-Archean homogenization of early-formed 182W and 142Nd heterogeneities and makes it difficult to preserve ancient μ182W and μ142Nd deviations from BSE values. Nevertheless, μ182W < 0 inherited from the combined effects of early crust-mantle differentiation and late accretion may under certain conditions be preserved in parts of Earth's mantle throughout the Archean, and perhaps even until today. The μ182W < 0 observed in recent oceanic basalts may therefore be inherited from early silicate differentiation or originate from potential core-mantle interaction at any time during Earth's history.

Dynamics of Open Quantum Systems—Markovian Semigroups and Beyond

The idea of an open quantum system was introduced in the 1950s as a response to the problems encountered in areas such as nuclear magnetic resonance and the decay of unstable atoms. Nowadays, dynamical models of open quantum systems have become essential components in many applications of quantum mechanics. This paper provides an overview of the fundamental concepts of open quantum systems. All underlying definitions, algebraic methods and crucial theorems are presented. In particular, dynamical semigroups with corresponding time-independent generators are characterized. Furthermore, evolution models that induce memory effects are discussed. Finally, measures of non-Markovianity are recapped and interpreted from a perspective of physical relevance.

Magmatic erosion of high-temperature-melting cumulates in the Bushveld Complex by chemical dissolution

• At least 10–20 m of floor cumulates are eroded away in the Bushveld complex. • These cumulates have very high melting temperatures (∼1400–1500 °C). • Low-temperature (∼1200 °C) replenishing melts cannot melt such cumulates. • The cumulates can, however, be chemically dissolved in these melts. • The replenishing melts were likely slightly superheated. The Bushveld Complex in South Africa shows spectacular examples of regional and local magmatic erosion of the floor cumulates by new melt batches that replenished the evolving magma chamber. Field observations indicate that, at some stratigraphic levels, at least, 15–20 m of pre-existing floor cumulates, often nearly monomineralic in composition (e.g., anorthosite or orthopyroxenite) were completely removed on a regional scale. What was the major agent of this erosion – (partial) melting or dissolution of the floor cumulates – remains poorly understood. Thermal melting appears to be a poor candidate because normal basaltic melts (∼1220–1260°C) cannot heat up the cumulates up to their melting temperature (∼1400–1500°C). We explored, therefore, the possibility of dissolution of these high-temperature-melting cumulates by slightly superheated (15°C above the liquidus) basaltic-andesitic melts that recharged the chamber and spread out laterally along its floor as basal flows. This was done using a freely available thermodynamic tool for phase equilibria modeling of open magmatic systems – the Magma Chamber Simulator. Our thermodynamic modeling shows that the superheated melts can digest up to 4.5–8.0 wt% of the bulk floor cumulates without inducing crystallization of the melts, despite them being much colder than the liquidus temperatures of these cumulates. This is equivalent to regional erosion of 15–24 m of the floor cumulates, given a basal melt layer of about 350 m thick. We conclude that the regional erosion of the high-temperature-melting floor cumulates in the Bushveld chamber has been mostly controlled by their chemical dissolution by replenishing superheated melts.

Quantum Thermodynamic Uncertainty Relations, Generalized Current Fluctuations and Nonequilibrium Fluctuation-Dissipation Inequalities.

Thermodynamic uncertainty relations (TURs) represent one of the few broad-based and fundamental relations in our toolbox for tackling the thermodynamics of nonequilibrium systems. One form of TUR quantifies the minimal energetic cost of achieving a certain precision in determining a nonequilibrium current. In this initial stage of our research program, our goal is to provide the quantum theoretical basis of TURs using microphysics models of linear open quantum systems where it is possible to obtain exact solutions. In paper [Dong et al., Entropy 2022, 24, 870], we show how TURs are rooted in the quantum uncertainty principles and the fluctuation–dissipation inequalities (FDI) under fully nonequilibrium conditions. In this paper, we shift our attention from the quantum basis to the thermal manifests. Using a microscopic model for the bath’s spectral density in quantum Brownian motion studies, we formulate a “thermal” FDI in the quantum nonequilibrium dynamics which is valid at high temperatures. This brings the quantum TURs we derive here to the classical domain and can thus be compared with some popular forms of TURs. In the thermal-energy-dominated regimes, our FDIs provide better estimates on the uncertainty of thermodynamic quantities. Our treatment includes full back-action from the environment onto the system. As a concrete example of the generalized current, we examine the energy flux or power entering the Brownian particle and find an exact expression of the corresponding current–current correlations. In so doing, we show that the statistical properties of the bath and the causality of the system+bath interaction both enter into the TURs obeyed by the thermodynamic quantities.

The Effectiveness of Planned Teaching Programme on Knowledge of Foot Care among Diabetic Patients

Statement of the problem: “A study to assess the effectiveness of planned teaching programme on knowledge of foot care among diabetic patients in ideas hospital, Gwalior (M.P)”. Objectives: to assess the pre-test knowledge regarding foot care for the Diabetic patient, to assess the effectiveness of planned teaching programme on Diabetic foot care and To determine the association between post test knowledge regarding foot care with selected demographic variables. Hypothesis: H1: The mean post test knowledge will be significantly higher than the pre test score. H2: There will be a significant association with knowledge score with selected demographic variables Conceptual Frame Work: Conceptual Frame Work Adopted for This Study is based on the J.W.Kenny’s open system model. Research Methodology: The research used one pre- and post-test group and a pre- and post-experimental design. Gwalior's Ideas Hospital served as the site of the investigation. Patients with diabetes mellitus were the focus of the investigation. Thirty diabetic individuals were selected via the use of a purposive sampling approach. There was a systematic questionnaire used to gather demographic information and identify the knowledge and rating scale used to evaluate the practice of the patients. Descriptive and inferential statistics were used to examine and interpret the data in light of the study's goals and hypotheses. It was decided to use a 0.05 threshold of significance for this study. A three-part structure. Section A: consist of socio-demographic data, Section B: Consist of 34 items (structured questionnaire) to assess the knowledge regarding diabetic foot care, Section C: Structured teaching programme on diabetic foot care. Results: A mean of 47.45 percent with a standard deviation of 2.62 was recorded in the pre-test knowledge scores, but the post-test results showed an improvement of 82.15 percent with a standard deviation of 1.837. Diabetes foot care knowledge and household income have a strong correlation. Conclusion: When it comes to diabetes, 41% of diabetic patients have inadequate knowledge; 53% are in the middle, and just 3% are in the top 5%. However, when it comes to diabetic foot care knowledge, only 3% have average knowledge, and 96% are in the best 10% of the population. According to the research results, the organized instruction program was successful.

Eliminating Radiative Losses in Long-Range Exciton Transport

We demonstrate that it is possible to effectively eliminate radiative losses during excitonic energy transport in systems with an intrinsic energy gradient. By considering chain-like systems of repeating `unit' cells which can each consist of multiple sites, we show that tuning a single system parameter (the intra-unit-cell coupling) leads to efficient and highly robust transport over relatively long distances. This remarkable transport performance is shown to originate from a partitioning of the system's eigenstates into energetically-separated bright and dark subspaces, allowing long range transport to proceed efficiently through a `dark chain' of eigenstates. Finally, we discuss the effects of intrinsic dipole moments, which are of particular relevance to molecular architectures, and demonstrate that appropriately-aligned dipoles can lead to additional protection against other (non-radiative) loss processes. Our dimensionless open quantum systems model is designed to be broadly applicable to a range of experimental platforms.

Non-Markovian entanglement dynamics of three independent qubits within atomic-cavity system

All realistic quantum systems will interact with their environments. This fact presents challenges to the implementation of quantum systems for practical systems. One of the most important quantum resources is the implementation of entanglement. In this paper, we investigate the interplay between the effects of noisy environments and the dynamics of entanglement. The open quantum system model that will be used is cavity quantum electrodynamics (CQED) with three-qubit interacting independently with a variation of environmental model. We use master equation to describe the dynamics of the open quantum system and a lower bound concurrence (CLBC ) to measure the entanglement of tripartite qubit. We derive the exact dynamics of each model and use CLBC method proposed by Li et.al to visualize entanglement dynamics. By adjusting the environmental parameters, we also found revivals and dark-periods of entanglement which are unique to non-Markovian processes.

Open source modelling of scenarios for a 100% renewable energy system in Barbados incorporating shore-to-ship power and electric vehicles

The high dependence on imported fuels and the potential for both climate change mitigation and economic diversification make Barbados' energy system particularly interesting for detailed transformation analysis. An open source energy system model is presented here for the analysis of a future Barbadian energy system. The model was applied in a scenario analysis, using a greenfield approach, to investigate cost-optimal and 100% renewable energy system configurations. Within the scenarios, the electrification of private passenger vehicles and cruise ships through shore-to-ship power supply was modelled to assess its impact on the energy system and the necessary investment in storage. Results show that for most scenarios of a system in 2030, a renewable energy share of over 80% is achieved in cost-optimal cases, even with a growing demand. The system's levelised costs of electricity range from 0.17 to 0.36 BBD/kWh in the cost-optimal scenarios and increase only moderately for 100% renewable systems. Under the reasonable assumption of decreasing photovoltaic investment costs, system costs of a 100% system may be lower than the current costs. The results show that pumped hydro-storage is a no-regret option for the Barbadian power system design. Overall, the results highlight the great potential of renewable energy as well as the technical and economic feasibility of a 100% renewable energy system for Barbados.

Comparing open source power system models - A case study focusing on fundamental modeling parameters for the German energy transition

Recent European and German climate targets call for a faster power system transition towards variable renewable energy sources. With the increasing importance of Open Science, several Open Source models have been developed in recent years. However, only a few studies exist that compare their performance against each other. Therefore, this study performs a comprehensive model comparison of five mature Open Source power sector models. For this purpose, we apply eight fully harmonized and simplified one-year scenarios for the German power sector, to analyze deviations in model results. First, an in-depth analysis of two base scenarios for 2016 and 2030 reveals that linear programming-based models differ substantially from models with pre-implemented dispatch orders. Other deviations occur across all models and are mainly caused by the indifferent use of flexibility options such as storage and transmission. Second, variations of parameters and characteristics with a political significance are individually applied to the 2030 base scenario to identify their impact on model results. This includes CO2 emission budgets, increased demands by sector coupling, coal exit strategies, and renewable generation shares. The results prove that some models are far more sensitive to these parameters than others, and renewable generation shares alone are not sufficient to reach desired effects in emission reductions. Finally, a comprehensive scenario for 2030 combines all measures to evaluate general trends that result from the most recent updates in German energy policy. Model results indicate that the new targets require substantially increased investments into renewable generation capacities, storage, and transmission.

Assessments of linear power flow and transmission loss approximations in coordinated capacity expansion problems

With rising shares of renewables and the need to properly assess trade-offs between transmission, storage and sectoral integration as balancing options, building a bridge between energy system models and detailed power flow studies becomes increasingly important, but is computationally challenging.Here, we compare approximations for two nonlinear phenomena, power flow and transmission losses, in linear capacity expansion problems that co-optimise investments in generation, storage and transmission infrastructure. We evaluate different flow representations discussing differences in investment decisions, nodal prices, the deviation of optimised flows and losses from simulated AC power flows, and the computational performance. By using the open European power system model PyPSA-Eur, we obtain detailed and reproducible results aiming at facilitating the selection of a suitable power flow model.Given the differences in complexity, the optimal choice depends on the application, the user’s available computational resources, and the level of spatial detail considered. Although the commonly used transport model can already identify key features of a cost-efficient system while being quick to solve, severe deficiencies under high loading conditions arise due to the lack of a physical grid representation. Moreover, disregarding transmission losses overestimates optimal grid expansion by 20%. Adding a convex relaxation of quadratic losses with three tangents to the linearised power flow and accounting for changing line impedances as the network is reinforced suffices to represent power flows and losses adequately in design studies. We show that the obtained investment and dispatch decisions are then sufficiently physical to be used in more detailed nonlinear simulations of AC power flow evaluating their technical feasibility.

Derivation of Liouville-like equations for the n-state probability density of an open system with thermalized particle reservoirs and its link to molecular simulation

A physico-mathematical model of open systems proposed in a previous paper (Delle Site and Klein 2020 J. Math. Phys. 61 083102) can represent a guiding reference in designing an accurate simulation scheme for an open molecular system embedded in a reservoir of energy and particles. The derived equations and the corresponding boundary conditions are obtained without assuming the action of an external source of heat that assures thermodynamic consistency of the open system with respect to a state of reference. However, in numerical schemes the temperature in the reservoir must be controlled by an external heat bath otherwise thermodynamic consistency cannot be achieved. In this perspective, the question to address is whether the explicit addition of an external heat bath in the theoretical model modifies the equations of the open system and its boundary conditions. In this work we consider this aspect and explicitly describe the evolution of the reservoir employing the Bergmann–Lebowitz statistical model of thermostat. It is shown that the resulting equations for the open system itself are not affected by this change and an example of numerical application is reviewed where the current result shows its conceptual relevance. Finally, a list of pending mathematical and modelling problems is discussed the solution of which would strengthen the mathematical rigour of the model and offer new perspectives for the further development of a new multiscale simulation scheme.

An open systems model of successful school leadership

PurposeThrough description and consideration of 12 models developed as part of the International Successful School Principalship Project (ISSPP), a new model of successful school leadership is developed.Design/methodology/approachThe paper is necessarily descriptive in nature. For the first time, 12 ISSPP models are described together, and these descriptions are then used inductively to create a new successful school leadership model.FindingsThe open systems approach adopted depicts schools as a continuous cycle of input-transformation-output with feedback loops that inform each stage of the cycle. The inputs are the variables that lead to transformation. The transformation stage is the actions or processes that individuals, groups and organisations engage in because of the inputs, and these lead to a range of student and school outcomes. Feedback loops connect the stages, and the whole model is open to the influence of five contextual forces: economic, political, socio-cultural, technological and system, institutional and educational.Originality/valueModels are an important way to make sense of complex phenomena. A new model of successful school leadership, with an open systems approach, provides a different frame to consider the findings of the ISSPP and potentially allows the ISSPP research to inform practice and connect with other school leadership views in new ways.

Melting and Evolution of Amphibole‐Rich Back‐Arc Abyssal Peridotites at the Mado Megamullion, Shikoku Basin

AbstractThe Mado Megamullion is an oceanic core complex (OCC) in the Shikoku back‐arc basin within the Philippine Sea Plate. Mantle peridotites (serpentinized) recovered by six dredge and submersible cruises exhibit signatures of extensive deformation. Amorphous pseudomorphs after plagioclase in many of the samples, as well as plagioclase‐spinel intergrowths, are clear evidence of melt stagnation and mantle reaction. Spinels show a wide range of compositions in terms of their Cr#, Mg#, and TiO2 content. The presence of apparently magmatic high‐temperature pargasitic amphibole in veins and as replacement of clinopyroxene suggests that it may be a primary or near‐primary mineral crystallized from a hydrous melt which is unusual for abyssal peridotites. Two trace‐element populations of clinopyroxenes are in equilibrium with depleted and enriched basaltic melts, respectively. Rare‐earth element (REE) in the most depleted clinopyroxenes are modeled by 10% fractional melting except for a ubiquitous La‐Ce “kick.” Multiple models of open system melting combined with subsequent mixing of an enriched melt can explain the REE data. Broadly it appears that the peridotites underwent variable degrees of partial melting with moderate influx of enriched melts, which agrees with the other textural and chemical evidence of melt‐rock reaction and re‐fertilization. The compositions of the accumulated melts simulated by the open system models reproduce the enrichments in fluid mobile elements (Ba, U, and Pb) observed in basalts dredged from the Shikoku basin. Back‐arc basin peridotites at Mado Megamullion appear to have a unique petrographic and geochemical character that is distinct from those of peridotites exposed at the seafloor after formation from mid‐ocean ridges.

Thermodynamic limits for assimilation of silicate crust in primitive magmas

Abstract Some geochemical models for basaltic and more primitive rocks suggest that their parental magmas have assimilated tens of weight percent of crustal silicate wall rock. But what are the thermodynamic limits for assimilation in primitive magmas? We pursue this question quantitatively using a freely available thermodynamic tool for phase equilibria modeling of open magmatic systems—the Magma Chamber Simulator (https://mcs.geol.ucsb.edu)—and focus on modeling assimilation of wall-rock partial melts, which is thermodynamically more efficient compared to bulk assimilation of stoped wall-rock blocks in primitive igneous systems. In the simulations, diverse komatiitic, picritic, and basaltic parental magmas assimilate progressive partial melts of preheated average lower, middle, and upper crust in amounts allowed by thermodynamics. Our results indicate that it is difficult for any subalkaline primitive magma to assimilate more than 20−30 wt% of upper or middle crust before evolving to compositions with higher SiO2 than a basaltic magma (52 wt%). On the other hand, typical komatiitic magmas have thermodynamic potential to assimilate as much as their own mass (59−102 wt%) of lower crust and retain a basaltic composition. The compositions of the parental melt and the assimilant heavily influence both how much assimilation is energetically possible in primitive magmas and the final magma composition given typical temperatures. These findings have important implications for the role of assimilation in the generation and evolution of, e.g., ultramafic to mafic trans-Moho magmatic systems, siliceous high-Mg basalts, and massif-type anorthosites.

Team Development Using Open-System Group Model

Team management is needed to support the achievement of organizational goals. One form of good team management also includes efforts to understand and develop the team. The purpose of team development is to ensure that the team can consistently produce the required performance to help organizational processes. This study uses the Open-System model as an effort to understand and carry out team development. The object of this study is the components in one of the teams, namely the Human Resource Development (PSDM) team with team members and the team's environmental conditions. The data collection methods used were interviews with team members, observations of the team's work environment, and document studies on team performance profiles. Data analysis is carried out by integrating findings that have been categorized based on the Open-System model qualitatively. The findings of this study indicate that the Open-System model is able to provide a structured picture of the condition and performance of the HRD team. The main problem condition is that the team work target is not yet solid. The intervention used in responding to the team's assessment results is the preparation of team performance targets using special key performance indicators for the team, so this research is very helpful in developing excellent performance.

The Lindblad and Redfield forms derived from the Born–Markov master equation without secular approximation and their applications

In this paper, we derive the Lindblad and Redfield forms of the master equation based on the Born–Markov master equation with and without the secular approximation for open multi-level quantum systems. The coefficients of the equations are re-evaluated according to the scheme in [(2019), Phys. Rev. A 99, 022118]. They are complex numbers rather than the real numbers obtained from traditional simplified methods. The dynamics of two models (one is an open three-level quantum system model, and the other is the model of phycoerythrin 545 (PE545) in a photosynthesis system) are studied. It is shown that the secular approximation and the simplified real coefficients may cause a small distortion of the dynamics in some environments, but a large distortion of the dynamics in others. These effects are discussed and characterized by studying the dynamics of nontrivial instances of multi-level systems in the presence of dissipation.

Discrete Time Hybrid Semi-Markov Models in Manpower Planning

Discrete time Markov models are used in a wide variety of social sciences. However, these models possess the memoryless property, which makes them less suitable for certain applications. Semi-Markov models allow for more flexible sojourn time distributions, which can accommodate for duration of stay effects. An overview of differences and possible obstacles regarding the use of Markov and semi-Markov models in manpower planning was first given by Valliant and Milkovich (1977). We further elaborate on their insights and introduce hybrid semi-Markov models for open systems with transition-dependent sojourn time distributions. Hybrid semi-Markov models aim to reduce model complexity in terms of the number of parameters to be estimated by only taking into account duration of stay effects for those transitions for which it is useful. Prediction equations for the stock vector are derived and discussed. Furthermore, the insights are illustrated and discussed based on a real world personnel dataset. The hybrid semi-Markov model is compared with the Markov and the semi-Markov models by diverse model selection criteria.

Principles underlying efficient exciton transport unveiled by information-geometric analysis

Adapting techniques from the field of information geometry, we show that open quantum system models of Frenkel exciton transport, a prevalent process in photosynthetic networks, belong to a class of mathematical models known as “sloppy.” Performing a Fisher-information-based multiparameter sensitivity analysis to investigate the full dynamical evolution of the system and reveal this sloppiness, we establish which features of a transport network lie at the heart of efficient performance. We find that fine tuning the excitation energies in the network is generally far more important than optimizing the network geometry and that these conclusions hold for different measures of efficiency and when model parameters are subject to disorder within parameter regimes typical of molecular complexes involved in photosynthesis. Our approach and insights are equally applicable to other physical implementations of quantum transport.Received 8 May 2020Revised 31 May 2021Accepted 8 June 2021DOI:https://doi.org/10.1103/PhysRevResearch.3.L032001Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasExcitonsOpen quantum systems & decoherenceQuantum transportTechniquesGeometryInformation theoryMaster equationCondensed Matter, Materials & Applied PhysicsAtomic, Molecular & Optical

A Study to Assess the Effectiveness of Planned Teaching Programme on Knowledge regarding No-Scalpel Vasectomy (NSV) among Married men and women in a selected rural area, Coimbatore

The present study is aimed to assess the knowledge of married men and women regarding No-Scalpel Vasectomy in a selected rural area, Coimbatore. The objectives of the study is to assess the knowledge among married men and women about No Scalpel Vasectomy by using a structured questionnaire, to assess the effectiveness of planned teaching programme, and to find the association between the findings and selected demographic variables such as age, gender, religion, educational status, occupation, monthly income, type of family, age at marriage, duration of married life, number of children, history of infertility medication if any, adoption of temporary family planning method, relatives with permanent family planning methods, awareness about No-Scalpel Vasectomy. The conceptual frame work for this study was based on Modified Open System Model by J.W. Kenny. Pre-experimental one group pretest posttest design was used for this study. The study was conducted among 60 married men and women who have not undergone permanent sterilization residing in Semmanichetti Palayam, Coimbatore. The village is 18 kilometre away from PPG College of Nursing. Purposive sampling technique was used in this study. Data collection was done from 16 September 2019 to 12 October 2019. Formal written permission was obtained from the medical officer in SMC Palayam, Primary Health Centre. Data was collected by administering the structured questionnaire before and after the planned teaching programme. The post- test was conducted after the sixth day of planned teaching programme. Data was analysed by using descriptive and inferential statistics. Paired ‘t’ test was used to find the effectiveness of planned teaching programme and ‘Chi-Square’ was used to find the association. The result of the study reveals that married men and women have lack of knowledge about No-Scalpel Vasectomy. The mean knowledge of married men and women in the pre-test was 14.93 in the pre-test with the standard deviation of 1.7. There was a marked gain in the mean knowledge score of married men and women after the administration of planned teaching programme (24.32) with the standard deviation of 1.8. The study concluded that the Planned Teaching Programme is effective in increasing the knowledge regarding No-Scalpel Vasectomy.