Browsing by Author "Nguyen T"
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- ItemA longitudinal analysis of communication traits: communication apprehension, willingness to communicate, and self-perceived communication competence(Taylor and Francis Group, 2024) Croucher SM; Kelly S; Nguyen T; Rocker K; Yotes T; Cullinane JThis longitudinal study assessed the communication apprehension, willingness to communicate, and self-perceived communication competence for a group of participants across a 15-year span. In total, 220 of 237 participants completed the 15-year project. The data represent six time points, with data collections happening once every three years. The results show that meeting communication apprehension, dyadic communication apprehension, public communication apprehension, willingness to communicate, and self-perceived communication competence all changed across time, indicating these traditionally thought of trait-like variables behaved more as state-like characteristics. Group communication apprehension did not change over time, indicating it may be more trait-like than state like. Results are limited by evidence of poor temporal stability for the public communication apprehension, self-perceived communication competence, and willingness to communicate measures.
- ItemCOVID-19 Prejudice Towards Afro-Brazilians(Taylor and Francis Group on behalf of the World Communication Association, 2022-04) Croucher S; Nguyen T; Ashwell D; Spencer A; Permyakova T; Gomez OAs of May 2021, more than 14.7 million people have been infected and nearly 409,000 people have died from COVID-19 in Brazil. During the pandemic, there were countless cases of discrimination, racism, prejudice, and violence towards Brazil’s Afro-Brazilian population. Using integrated threat theory (ITT), this study investigates prejudice towards Afro-Brazilians. Specifically, this study (n= 410) examines the extent to which COVID-19 related prejudice towards Afro-Brazilians, who were partially blamed for the spread of the virus, is related to prejudice and fear of COVID-19. Results reveal the following: ethnocentrism is positively related to symbolic and realistic threat and fear of COVID-19 is positively related to symbolic and realistic threat.
- ItemCOVID-19 vaccine strategies for Aotearoa New Zealand: a mathematical modelling study(Elsevier Ltd, 2021-10) Nguyen T; Adnan M; Nguyen BP; de Ligt J; Geoghegan JL; Dean R; Jefferies S; Baker MG; Seah WKG; Sporle AA; French NP; Murdoch DR; Welch D; Simpson CRBackground: COVID-19 elimination measures, including border closures have been applied in New Zealand. We have modelled the potential effect of vaccination programmes for opening borders. Methods: We used a deterministic age-stratified Susceptible, Exposed, Infectious, Recovered (SEIR) model. We minimised spread by varying the age-stratified vaccine allocation to find the minimum herd immunity requirements (the effective reproduction number Reff<1 with closed borders) under various vaccine effectiveness (VE) scenarios and R0 values. We ran two-year open-border simulations for two vaccine strategies: minimising Reff and targeting high-risk groups. Findings: Targeting of high-risk groups will result in lower hospitalisations and deaths in most scenarios. Reaching the herd immunity threshold (HIT) with a vaccine of 90% VE against disease and 80% VE against infection requires at least 86•5% total population uptake for R0=4•5 (with high vaccination coverage for 30-49-year-olds) and 98•1% uptake for R0=6. In a two-year open-border scenario with 10 overseas cases daily and 90% total population vaccine uptake (including 0-15 year olds) with the same vaccine, the strategy of targeting high-risk groups is close to achieving HIT, with an estimated 11,400 total hospitalisations (peak 324 active and 36 new daily cases in hospitals), and 1,030 total deaths. Interpretation: Targeting high-risk groups for vaccination will result in fewer hospitalisations and deaths with open borders compared to targeting reduced transmission. With a highly effective vaccine and a high total uptake, opening borders will result in increasing cases, hospitalisations, and deaths. Other public health and social measures will still be required as part of an effective pandemic response. Funding: This project was funded by the Health Research Council [20/1018]. Research in context.
- ItemDoes student sampling impact our understanding of argumentativeness and verbal aggressiveness?(Taylor and Francis Group on behalf of the American Forensic Association, 2024-08-17) Croucher SM; Kelly S; Elers P; Jackson K; Nguyen TStudent samples are regularly used in research. While student samples are convenient and easy to access, the use of such samples has been criticized for exposing theories and research to internal validity threats, as students are not representative of the general population. Using argumentativeness and verbal aggressiveness as contexts for analysis, this study explores the extent to which student and non-student samples differ in published empirical research. We found that in the case of the original verbal aggression and argumentativeness measures, sample type did not moderate the means among argumentativeness and verbal aggressiveness studies. We discuss the implications of these findings in terms of student vs. non-student samples.
- ItemIncreasing Supply for Woody-Biomass-Based Energy through Wasted Resources: Insights from US Private Landowners(MDPI AG, 23/05/2023) Nguyen TWoody biomass is suggested as a substitute for fossil fuels to achieve sustainable development. However, transitioning the land purpose to produce woody biomass entails investment and a tradeoff between wood pellet production and the current utilities created by the land, hindering the willingness of private landowners. To many forest landowners, forest trees and residues considered unprofitable to transport would be left in the forest without other proper use. The wasted woody resources on the land can be a potential source to increase the woody biomass supply. To support the policymakers, logging companies, state agencies, and landowners to better capitalize on these wasted resources, we aimed to identify the characteristics of woody-resource-wasting landowners and examine how to increase their likelihood to contribute to woody-biomass-based energy. By employing Bayesian Mindsponge Framework (BMF) analytics on a dataset of 707 private landowners in the United States (US), we discovered that landowners being male, having higher income, and being a member of a state/national forestry organization were more likely to waste woody resources. Moreover, woody-resource-wasting landowners perceiving woody-biomass-based energy as a substitution for fossil fuel were more likely to sell wood. In contrast, those perceiving environmental costs over the benefits of woody-biomass-based energy were less likely to sell. These findings can be used as insights for policymakers, logging companies, and state agencies to find an additional supply of woody-biomass-based energy from landowners likely to waste woody resources.
- ItemOperational Efficiency of Bank Loans and Deposits: A Case Study of Vietnamese Banking System(MDPI (Basel, Switzerland), 2018-03) Nguyen T; Tripe D; Ngo TThis paper examines whether there is a causal relationship between bank loans and deposits in the Vietnamese banking system and the efficiency of the use of loans and deposits by the Vietnamese banks. In a country such as Vietnam, where inter-bank money markets are relatively underdeveloped, one would expect a reasonably strong relationship between deposits and loans. A pooled cross-sectional sample of financial ratios is collected from annual reports of 44 Vietnamese banks covering the period 2008–2015. The explanatory power of instrumental variables in relation to the endogenous variables is tested. A deterministic frontier model based on corrected ordinary least squares, estimated by three-stage least squares on a simultaneous equations model, is employed to derive the frontiers for the sampled banks as well as to estimate the causality between bank loans and deposits. Our findings suggest that, in an underdeveloped banking system such as Vietnam, bank deposits have a positive and significant impact on bank loans, but the reverse relationship is not significant. It is further suggested that in deposit-taking and loan-creating activities, Vietnamese banks performed moderately well over the period examined; however, in the near future, they should start to focus more on deposit-taking activities.
- ItemPrejudice Toward Asian Americans in the Covid-19 Pandemic: The Effects of Social Media Use in the United States(Frontiers Media SA, 12/06/2020) Croucher S; Nguyen T; Rahmani D; Ahmed, RThe ongoing Covid-19 outbreak has brought increased incidents of racism, discrimination, and violence against “Asians,” particularly in the United States, with reports of hate crimes of over 100 per day. Since January 2020, many Asian Americans have reported suffering racial slurs, wrongful workplace termination, being spat on, physical violence, extreme physical distancing, etc., as media and government officials increasingly stigmatize and blame Asians for the spread of Covid-19. The links with social media are increasingly evident, as anti-Asian sentiment increases, with reports of anti-Asian sentiment spreading and Asian-Americans fighting hate via social media. Using integrated threat theory, this study explores the links between prejudice/hate toward Asians-Americans, in particular Chinese, and social media use. Three key results emerged from the study. First, the more a social media user believes their most used daily social media is fair, accurate, presents the facts, and is concerned about the public (social media believe), the more likely that user is to believe Chinese pose a realistic and symbolic threat to America. Second, men and women significantly differed on each type of prejudice, with men scoring higher on intergroup anxiety and women higher on symbolic and realistic threat. Third, respondents who do not use social media on a daily basis are less likely than those who use Facebook to perceive Chinese as a symbolic threat. Implications and recommendations for practitioners, health workers and government are proposed.
- ItemThe effect of variations in cold plasma conditions on the detoxification of Aflatoxin M1 and degradation products(Elsevier B.V., 2024-10-16) Nguyen T; Palmer J; Pedley J; Petcu M; Newson HL; Keener K; Flint SThe aim of this study was to explore the chemical reactive species of different operating gases, and their effect on the degradation of aflatoxin M1 (AFM1) by cold plasma by measuring the reactive species concentration. Helium, at 80, 90 or 95%, was used mixed with oxygen, nitrogen and air. The efficacy of cold plasma on aflatoxin M1 (AFM1) reduction was improved when decreasing the ratio of helium in the gas mixture. The ratio of the gas mixtures changed the cold plasma chemistry believed to be due to the differences in the concentrations of the reactive species. The degradation products of AFM1 after cold plasma treatment using a helium/air gas mixture and the degradation pathway were identified by LCMS. AFM1 was oxidised by reactive species in the cold plasma to produce degradant products with, theoretically, lower toxicity than AFM1.
