Process Of Change Research Articles

Improving lithium battery cooling: analyzing the impact of air flow, nanofluid flow, and phase change materials

In this study, a finite element analysis is employed to numerically investigate the thermal behavior of a battery pack comprising cylindrical lithium-ion cells. The system incorporates air cooling with phase change material (PCM) surrounding the batteries and nanofluid (NFD) circulating within the PCM through tubes of varying diameters (ranging from 2 mm to 6 mm) at flow rates (FRT) spanning 5 mL/min to 20 mL/min. A two-phase mixture model is applied to analyze the behavior of the NFD as it changes phase. The transient simulation covers a 1-h period to assess temperature variations of the NFD, batteries, surrounding air, PCM, and the phase change process within the PCM. Our results indicate that variations in NFD flow rate (NFFR) do not significantly affect the PCM’s molten fraction during PCM melting, coinciding with an increase in battery temperature (TBT). However, during the PCM refreezing phase, a FRT of 15 mL/min results in the highest quantity of solid PCM. The outlet temperature (TOT) of the NFD demonstrates a cyclical pattern of increase and decrease over time. We observe that when the NFD temperature is elevated, the lowest TOT of the NFD is associated with a FRT of 5 mL/min. Conversely, when the NFD temperature is lowered, this FRT leads to the highest TOT of the NFD. The TBT exhibits some sensitivity to changes in FRT within the initial half-hour, with a subsequent decline, particularly with a FRT of 15 mL/min.

Research on the Evaluation and Influencing Factors of China’s Provincial Employment Quality Based on Principal Tensor Analysis

The research on the quality of employment in China holds immense significance for attaining high-quality employment development. Firstly, enhancing the quality of employment facilitates the optimization of labor resource allocation and enhances economic efficiency. Secondly, high-quality employment serves as a fundamental pillar for social equity and stability. Lastly, continual enhancement of employment quality caters to the requirements of social development and plays a crucial role in promoting economic transformation and achieving sustainable development. However, what is the current situation of employment quality in China? How can we scientifically measure employment quality? What are the key factors for the development of employment quality? This study aimed to use spatiotemporal tensor data to measure the level of employment quality in China’s provinces and analyzed the magnitude and direction of its influencing factors in the spatiotemporal dimension. Taking thirty provinces, autonomous regions, and municipalities directly under the central government in China from 2011 to 2020 as the research objects, the employment quality evaluation system was constructed from six dimensions: employment environment, employment status, employability, labor remuneration, social security, and labor relations. The employment quality index data were expressed in the form of three-order, high-dimensional tensor spatiotemporal data, and the employment quality of China’s provinces was measured from the spatiotemporal perspective by using principal tensor analysis. Then, the visual analysis of the development and change process of employment quality was carried out. The spatial autocorrelation analysis of employment quality was carried out, and the time–space dual-fixed-effect model of the spatial Durbin model was selected to analyze the direction and magnitude of the influence factors of employment quality on the selected and neighboring provinces. The research showed that: (1) The overall level of employment quality in China was not high, the employment quality varied greatly among provinces, and the employment quality development gap among provinces showed a trend of widening. (2) The development of employment quality in western China was relatively fast, while the development of employment quality in central China showed insufficient stamina. (3) Sichuan Province had a strong radiation effect on the development of employment quality in neighboring provinces, and Beijing and Tianjin had a strong siphon effect on the development of employment quality in neighboring provinces. (4) The level of industrialization and informatization promoted the development of employment quality in China’s provinces, while the industrial structure had a significant negative effect on the development of employment quality. According to the research findings, the following policy recommendations are proposed: (1) strengthen inter-provincial cooperation and exchange, (2) emphasize support for the central and western regions, (3) fully leverage the radiation effect of Sichuan while optimizing the siphon effect of Beijing and Tianjin, and (4) enhance industrialization and information technology levels, as well as adjust the industrial structure.

Implementation of Archives Digitalization through Belajar.id Account in Improving Data Organization

The purpose writing this article is to understand the process of structuring digitized data at SDN 8 Rambang, due to archive services conventional which is ineffective and we are trying to change to a digital archive service. Due to the preservation of archives in the current era of Society 5.0 leads to how the public can access archival information that is capable of implementing technology in it. Archive arrangement includes several types of archives including textual, audio and audio-visual archives. The process of moving current archive contents saving it in different media, takes place continuously from old media to new media. Both documents and archives that are in digital format or still analog. Document digitization/archives are a process of change from conventional ones in various styles and forms to electronic archives.

Understanding the contemporary history of urban economic change: The case of entrepreneurial innovation

AbstractIn the opening decades of the twenty‐first century certain cities around the world emerged as hubs of entrepreneurial innovation. This paper explores this urban economic change phenomenon through in‐depth and comparative qualitative analysis. It focuses on the recent contemporary history of New York, Los Angeles, London, Berlin, Tokyo and Shanghai prior to the global COVID pandemic. Based on an analysis of the drivers, mechanisms and processes of change, it is found that these cities acted as places of possibility for many individuals who previously may have been unlikely to engage in entrepreneurship. The cities were found to have established new development paths through entrepreneurial innovation stemming from co‐creation network dynamics, with key human agents playing pivotal roles. Common elements include the rise of venture capital, the growth of entrepreneurial cultures, and institutional policy changes. Notably, entrepreneurial innovation was found to be closely tied to changes in large corporates. This innovation evolved through the proliferation of new infrastructure such as co‐working spaces and innovation incubators, with each city being utilised as a test‐bed for new ideas. Finally, the emergence of a darker side to entrepreneurial innovation is found in terms of growing urban inequality.

The Peak Stability Analysis through Hysteresis Phenomenon on Heterogeneous Networks

The macroscopic fundamental diagram (MFD) is a nonuniversal changing process over network traffic status which indicates different shapes in different networks. Hysteresis is observed in the MFD of some urban networks. It is a unique phenomenon when the network remains at low stability level and usually appears around the congestion period. This paper analyzed network peak stability through focusing on hysteresis. The formation mechanism of hysteresis is deduced from the mathematical method based on previous research studies. The precondition of hysteresis and the changing process of network state can be figured by mathematical deduction. It indicates that hysteresis only occurs conditionally in the period of macroscopic congestion and is not a universal phenomenon. Heterogeneity is an important factor leading to network instability. The hysteresis patterns of different peaks in MFD are different due to the variation of network flow. Real data are collected from Atlanta’s urban network to verify the analysis of hysteresis. To discuss the changing process of hysteresis in different peaks, a three-stage division is proposed and time series is presented as a third dimension in MFD. It is worth noticing that the existence and form of hysteresis in morning and evening peaks are different. Although there is a higher peak flow in the morning peak, the stability of the evening peak performs better when hysteresis occurs in the network. The different fluctuations in the morning and evening peaks are exhibited through the 3D version of MFD. The otherness of hysteresis in different peaks is explained through a 3D coordinate system with cross-compared corresponding indexes.

Changes of coastline and tidal flat and its implication for ecological protection under human activities: Take China’s Bohai Bay as an example

The change processes and trends of shoreline and tidal flat forced by human activities are essential issues for the sustainability of coastal area, which is also of great significance for understanding coastal ecological environment changes and even global changes. Based on field measurements, combined with Linear Regression (LR) model and Inverse Distance Weighing (IDW) method, this paper presents detailed analysis on the change history and trend of the shoreline and tidal flat in Bohai Bay. The shoreline faces a high erosion chance under the action of natural factors, while the tidal flat faces a different erosion and deposition patterns in Bohai Bay due to the impact of human activities. The implication of change rule for ecological protection and recovery is also discussed. Measures should be taken to protect the coastal ecological environment. The models used in this paper show a high correlation coefficient between observed and modeling data, which means that this method can be used to predict the changing trend of shoreline and tidal flat. The research results of present study can provide scientific supports for future coastal protection and management.©2024 China Geology Editorial Office.

Cytokines as fast indicator of infectious virus titer during process development

Measuring infectious titer is the most time-consuming method during the production and process development of live viruses. Conventionally, it is done by measuring the tissue culture infectious dose (TCID50) or plaque forming units (pfu) in cell-based assays. Such assays require a time span of more than a week to the readout and significantly slow down process development. In this study, we utilized the pro-inflammatory cytokine response of a Vero production cell line to a recombinant measles vaccine virus (MVV) as model system for rapidly determining infectious virus titer within several hours after infection instead of one week. Cytokines are immunostimulatory proteins contributing to the first line of defence against virus infection. The probed cytokines in this study were MCP-1 and RANTES, which are secreted in a virus dose as well as time dependent manner and correlate to TCID50 over a concentration range of several logarithmic levels with R2 = 0.86 and R2 = 0.83, respectively. Furthermore, the pro-inflammatory cytokine response of the cells was specific for infectious virus particles and not evoked with filtered virus seed. We also discovered that individual cytokine candidates may be more suitable for off- or at-line analysis, depending on the secretion profile as well as their sensitivity towards changing process conditions. Furthermore, the method can be applied to follow a purification procedure and is therefore suited for process development and control.

Organizational Change Dynamics and Their Impact on Employee Well-Being: A Quantitative Exploration within a Moroccan Hotel Chain

This research aims to examine the effect of organizational change on the health and well-being of employees, a topical issue in the contemporary professional environment. The study focuses on a case of a Moroccan hotel company, providing an original insight into the hotel industry in Morocco. The main goal is to explore the links between the dimensions of organizational change and the health and well-being of employees, in order to determine how organizations can optimize the management of these transformations. The research adopts a quantitative approach, including the collection of primary data from the employees of the hotel chain, followed by the validation of the instruments and a rigorous statistical analysis. The results show that the clarity of the goals and the vision of the change is essential for the health and well-being of employees. Moreover, the involvement of employees in the decisions related to the change has a positive influence on their health and well-being. However, the role of communication in the change process has not been verified significantly. These findings have practical implications for managers, highlighting the importance of clarity in communicating the goals and the involvement of employees in the decision-making process. They suggest strategies to improve the health and well-being of employees and their adaptation to the change, fostering a more positive and productive work climate.

Improving leadership skills of infection prevention and control teams by psychological empowerment: study protocol for a cluster randomised controlled trial (IP-POWER)

IntroductionInfection prevention and control (IPC) teams are routinely confronted with intense emotions in their daily work, as they are involved in many change processes with front-line medical staff, for example,...

A study of new labor market entrants' job satisfaction trajectories during a series of consecutive job changes.

Previous research on the psychological effect of job change has revealed a honeymoon-hangover pattern during the turnover process. However, there is a dearth of evidence on how individuals react and adapt to multiple job changes over their working lives. This study distinguishes adaptation to a single job change in the short term from adaptation to the process of job change in the long term. Drawing on two large-scale, long-running panel data sets from Britain and Australia, it examined how job satisfaction trajectory evolved as individuals made a series of consecutive job changes since they first entered the labor market. Our fixed effect analyses show that in both countries, individuals experienced a stronger honeymoon effect with each successive job change, before gradually reverting to their baseline job satisfaction. In short, the amplitude of the honeymoon-hangover effect increased across multiple job changes. By distinguishing "adaptation to change" from "change in adaptation," this study generates original insights into the role of job mobility in facilitating career development and extends set point theory from understanding the impact of single life events to recurring life events. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

Adverse human health effects of climate change: an update.

The world is currently facing a process of climate change, which may adversely impact human health in many different ways. The safety of food, water and urban environments is endangered by the consequences of climate change. Sea level and temperature rise, along with more frequent and longer heat waves, represent only a few of the effects of climate change. The increased risk of extreme climate events (e.g., cyclones, droughts and floods) is another serious public health issue. These adverse effects are enhanced in areas and countries not having the capacity to effectively deal with climate change. We primarily aimed at summarizing the impacts of climate change on public health. A further aim was to identify the most concerning consequences of this phenomenon and the vulnerability factors that amplify the negative effects of climate change. PubMed and other literature databases were used as literature sources for this narrative review based on the search terms 'climate change' and 'diseases categories' up to January 2024, in order to assess the most recent and relevant scientific evidence about the relation between climate change and public health, identify knowledge gaps and priorities for future research. We also screened the websites of major agencies devoted to human health protection and environmental health. Climate change appears to induce a broad spectrum of generally adverse effects on public health. It may increase the risk of infectious diseases, psychiatric disorders, cancer and other diseases. Currently, we are not effectively counteracting this phenomenon, since pollutant and greenhouse gas emissions have been increasing alongside temperatures. A host of measures are required in order to prevent and fight climate change and related health effects. These include the adoption of a holistic approach and the collaboration of different kinds of expertise in order to design more effective strategies. Special attention should be paid to those who live in disadvantaged countries, and those who are more vulnerable to the adverse health consequences of climate change.

Investigation of radial force in a high-speed miniature pump

A high-speed miniature pump design is put forth for utilization in the aerospace sector, where the pump’s reliability holds critical importance under microgravity operational conditions. This study focuses on a dynamic bearing-equipped miniature centrifugal pump, chosen for its suitability in investigating radial forces. The prototype of the miniature pump is manufactured and tested by experiments at the rotational speed of 10,000r/min. A good agreement is observed between the numerical predictions and the experimental results. The radial force acting on different blade part has been analyzed for several flow rate conditions using the steady state CFD calculation. It has been found that the radial force exerted on the blade trailing edge exit is the main cause of the total radial force for the impeller. Moreover, using the unsteady CFD simulation, the evolution process of the radial force changing for both the direction and the magnitude with respect to the annular position due to the shaft rotation is discussed in details. The pressure pulsation is also monitored in impeller and volute casing. The results show that the amplitude of the unsteady radial force has a strong relationship with the time it takes for the blade trailing edge exit passing the volute tongue region, while the direction of the radial force hardly changes. The findings of this study contribute to facilitating the broader implementation of the high-speed miniature pump across diverse sectors of society.

Flexural isostatic response of continental-scale deltas to climatically driven sea level changes

Abstract. The interplay between climate-forced sea level change, erosional and depositional processes, and flexural isostasy in deep time on passive margin deltas remains poorly understood. We performed a series of conceptual simulations to investigate flexural isostatic responses to high-frequency fluctuations in water and sediment load associated with climatically driven sea level changes. We model a large drainage basin that discharges to a continental margin and produces a large deltaic depocenter, then prescribe synthetic and climatic-driven sea level curves of different frequencies to assess flexural response. Results show that flexural isostatic responses are bidirectional over 100–1000 kyr timescales and are in sync with the magnitude, frequency, and direction of sea level fluctuations and that isostatic adjustments play an important role in driving along-strike and cross-shelf river mouth migration and sediment accumulation. Our findings demonstrate that climate-forced sea level changes produce a feedback mechanism that results in self-sustaining creation of accommodation into which sediment is deposited and plays a major role in delta morphology and stratigraphic architecture.

Charge Assessment for Nitrate-Based Salt as a Phase Change Material for a Medium-Temperature Latent Storage Tank

Abstract The present study assesses the heat characteristic of the nitrate-salt mixture as a phase change material (PCM) for a medium-temperature latent storage system (LSS). Two binary and ternary mixtures are evaluated, which demonstrate different thermal behaviour. The highest melting and latent heat capacity is obtained by KNO3(0.4)/NaNO3(0.6) at 223.8 °C and 161.5 J/g. However, it has a higher supercooling degree with a partial phase transition between 217.6 °C and 251.5 °C, making it unfeasible for a medium-temperature LSS tank. The ternary mixture (TM) with NaNO2(0.4)/KNO2(0.53)/NaNO3(0.7) demonstrates a stable phase transition with minimum partial phase transition (22.1 °C) and suitable heat of fusion (98.1 J/g). Further evaluation through static thermal profiling demonstrates that the TM has a notable performance during solid-sensible charge with a charge level indicator (CLI) around 45.3 %–49.1 %. The TM can be charged up to 85.7 % until the end stage of the phase transition. It promotes a better storage capacity with suitable performance since the system can be charged effectively at a suitable temperature range (< 160 °C) for various applications. The micrograph observation indicates some dispersed particles and local agglomeration, which makes phase stabilization as an advantageous method to promote a stable phase change process. The TM can be considered a suitable PCM for a medium-temperature LSS tank that allows for a better solar thermal renewable system operation.

Quantitative characterization of the effect of compaction rate on ammonium release from clayey sediments

Ammonium-rich pore water will release from clayey sediments into adjacent aquifers during aquitards compaction, which can adversely affect groundwater quality. Differences in the rate of groundwater exploitation can lead to differences in the rate of compaction of aquitards, which may, to some extent, affect the release of chemical components of the pore water from the aquitard. However, the effect of the compaction rate of aquitards on the process of ammonium release from clayey sediments is poorly understood. Three groups of indoor compaction experiments were conducted to identify the effect of compaction rate on ammonium release from clayey sediments during compaction. The results showed that the compaction rate and sediment liquid limit exert a clear controlling effect on the release rate and internal change process of ammonium in clayey sediments. The increase in the ammonium release rate was approximately proportional to the increase in the compaction rate. When the moisture content of the clayey sediments exceeds the liquid limit, the ammonium concentration in pore water increases mainly due to the mineralization of organic matter containing nitrogen and the dissolution of the carbonate-bound ammonium. When the moisture content drops to the liquid limit, the ammonium concentration in pore water begins to decrease. Because the increase in the compaction rate weakened sediment mineralization and accelerated pore water release, the main forms of ammonium released from the sediment change from organic sulfide-bound ammonium and carbonate-bound ammonium to carbonate-bound ammonium and ion-exchanged ammonium. The results of this study have important significance for the management of groundwater quality in groundwater exploitation areas.

You get us, so you like us: Feeling understood by an outgroup predicts more positive intergroup relations via perceived positive regard.

Intergroup felt understanding-the belief that outgroup members understand and accept ingroup perspectives-has been found to predict positive intergroup outcomes, but the mechanism through which it has its positive effects is unclear. Across eight studies, we tested the hypothesis that felt positive regard-the perception that outgroup members like and respect ingroup members-mediates the positive effects of felt understanding on outcomes like outgroup trust. Studies 1-6 (total N = 1,366) included cross-sectional and experimental designs and a range of intergroup settings such as Sunni-Shia relations in Lebanon, gender relations, and support for "Brexit" in the United Kingdom. Results of meta-analytic structural equation models across these studies provided evidence of the indirect effect of felt understanding via felt positive regard on outcomes including trust and positive relational emotions. Study 7 (N = 307) then tested the causal effect of felt positive regard through a direct manipulation. Findings confirmed that felt positive (vs. negative) regard did lead to more positive intergroup perceptions. Finally, Study 8 (N = 410) tested the indirect effect as a within-person change process using a year-long, two-wave study of the conflict in Chile between Indigenous Mapuche and Non-Indigenous Chileans: Change over time in felt understanding indirectly predicted change over time in trust via change in felt positive regard. We consider the theoretical implications of the findings for how intergroup relations may be improved and the possibilities presented by felt understanding for intervention development. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

금호강 유역 고려분묘 출토 도기 줄무늬병 연구

The pottery striped bottle of the Goryeo Dynasty is a characteristic bottle found in tombs in the Yeongnam area and this has received attention in that it reveals the locality of the Yeongnam region. This paper examined the process of change in the bottle, paying attention to the phenomenon that the striped bottle is intensively distributed in the Geumhogang River basin.
 The first period (middle 11th century to late 12th century) is the period in which hemispheric striped bottle and trumpet-mouth striped bottle coexist. The two types of striped bottles differ in the distribution range. Hemispheric striped bottles are excavated from the Nakdong River to the Geumho River, and trumpet-mouth striped bottles are excavated from the East Sea coast to the Geumho River. In the second period (13th century to 14th century), the trumpet-mouth striped-bottle was used alone, and the striped bottle culture, which developed in two directions through different routes, showed an integrated aspect centered on the Geumho River.
 The Geumho River basin is an important transportation hub, and the limited excavation pattern of the distribution of the striped bottle from the mid-stream of the Nakdong River to the East Sea is thought to be closely related to the distribution system formed around the road system of the time. In addition, this is an area that has long held the identity of the Silla people and the production base of earthenware early on, the earthenware production system. In this study, I tried to reveal the existence of a pottery production system shared in the Geumho River basin from the mid to late Goryeo period.

유아의 몸을 바라보는 교사의 변화과정과 즉흥연주로서의 교육과정 실행

The purpose of this study was to look back on the myself, who was trapped in the dominant discourse on the children's body, looked at the body from various angles and changed eyes, and to explore the changing process and curriculum of the teacher(I) as improvisation. This study is a self-study that records various events, feelings, experiences, and emotions encountered while looking at the children's body in everyday moments while living with children for a year from 2021, and experiences and emotions experienced while implementing the curriculum as an improvisation in photos, videos, and texts, frequently sharing opinions with fellow teachers and members of the learning community, analyzing the contents, and interpreting and describing their meaning. Through this study, teachers' old stereotypes and habits crack, fall into dilemmas, try to dismantle dichotomous structures, and see children communicate with the world through their bodies and acquire and express various experiences with their bodies, and teacher(I) try to de-power, trust children, recognize and watch their various attempts, listen to children, and practice pedagogy of listening. In addition, it creates a curriculum in which improvisation and planning are intertwined, and it contains various experiences and efforts to implement the curriculum as improvisation experienced by trying to escape. This suggests that teachers in the field see the children's body again, breaking away from the way they have seen it before, and provides the possibility to implement the curriculum as an improvisation based on the teacher’s changed gaze.

The Impact of Bureaucratic Reform Policy on Public Services at the Population and Civil Registration Service of North Padang Lawas Regency

Based on an analysis of the bureaucratic conditions in North Padang Lawas Regency after more than 15 years as a new autonomous region, it appears that the quality of public services is still low. The evaluation of the Indonesian Ombudsman Representative for North Sumatra in 2021 placed the district in the "bad" category. Research using qualitative models highlights obstacles to change, including resistance from employees who want to maintain the status quo. Although there is increased work motivation among some employees, senior employees tend to stick to a conservative mindset, creating a lack of uniformity in bureaucratic behavior. Bureaucratic reform efforts appear to be producing positive results in Disdukcapil services. Simplification of bureaucracy, application of information technology, and increased accessibility increase efficiency and effectiveness. Even though the Community Satisfaction Index survey shows an increase in positive perceptions, there are still discrepancies with observations in the field, especially regarding slow processes and lack of employee understanding. In the face of conservative employee resistance, Disdukcapil leaders need to engage them more in the change process, involving them in decision-making. It is also important to ensure services are inclusive, considering the needs of people with physical limitations or limited access to technology. Solutions such as pick-up services or efficient physical services can be implemented. This improvement is important to achieve the goals of bureaucratic reform and provide better services to the community.

Modeling and simulation of the cavitation phenomenon in turbopumps

This paper presents a model for simulating a two-phase flow involving cavitation and condensation, focusing on its application to turbopump flows. The model is derived by extending Kapila's approach, which incorporates thermal and free energy relaxation terms, to compressible multiphase flow equations in a rotating reference frame. The numerical method employed is a finite volume approach based on the Godunov scheme, ensuring pressure equilibrium and total energy conservation through a relaxation step. The model utilizes separate Equations of State (EOS) for the liquid and vapor phases, with the experimental saturation curve, expressed as psat(T), being the only parameter needed for cavitation modeling. To broaden its applicability beyond axial pumps, a specific Riemann solver is developed to couple rotating and non-rotating regions within the flow domain. The thermodynamic phase change process is validated using simple cases, and the model is further utilized to simulate water flows in a turbopump inducer. The characteristic curve of the pump is obtained in the non-cavitating regime for several mass flow rates conditions, and the model is successfully assessed in severe cavitation conditions, demonstrating the performance breakdown caused by vapor pockets. The modeling also provides detailed flow descriptions, including analysis of vapor pockets and their impact on blade pressure loading.