A Phylogeographic Analysis Of Sars-Cov-2 Variant Introduction

The ongoing SARS-CoV-2 pandemic is marked by continuing emergence of novel Omicron variants. However, the mechanism with which these lineages establish themselves in new geographical areas remains an understudied subject. In this research, we utilized a discrete phylogeographical analysis framework on 19,608 SARS-CoV-2 sequences of the BA.5 Omicron lineages between February and June 2022, in order to better understand how the variant emerged in different regions of the United States. We found that the earliest BA.5 introductions came from Africa, befitting the origin of the lineage. Additionally, we discovered extensive domestic transmission between the Department of Health and Human Services (HHS) regions of America through both neighboring effects and cross-country transmission. We found further evidence that two key regions that include California and Florida drove most within-U.S. introduction events of BA.5. Our results suggest a pattern of foreign importation and domestic spread, through interaction of these hotspot areas, and form a framework for understanding novel variant emergence in the United States

Use of a Trial Function Method to Semi-analytically Simulate Matrix Diffusion in Heterogeneous and Fractured Media

A semi-analytic trial function model is applied to simulate matrix diffusion in systems of parallel fractures, 2-D/3-D discrete fracture networks, and in 3-D heterogeneous media. The trial function model gives low normalized root mean square error (NRMSE) when compared to the parallel fracture analytical solution over a range of fracture spacing, with considerations for retardation and decay. The semi-analytic trial function model is efficient in time and maintains less than 6% NRMSE when it simulates matrix diffusive transport in 2-D/3-D discrete fracture networks (DFN). The model can predict DFN plume within a few meters of accuracy compared to fine-grid DFN models. In two material distributions of a heterogeneous media, the semi-analytic model is similarly efficient and accurate. The matrix diffusion modeling parameters of the trial function model can be directly computed in fractured and porous media using either the fracture properties or subsurface core/boreholes. An effort to improve the semi-analytic model by including a variable diffusion area is considered. The use of the variable diffusion area yields about a 5% gain in accuracy. In contrast to the semi-analytic trial function model, the dual-porosity model is shown to be a less robust equivalent porous media approach. The dual-porosity model relies on a first-order mass transfer coefficient, which is time-dependent. The mass transfer coefficient can be initially estimated as the inverse of the characteristic diffusion time. The dual-porosity model gives low NRMSEs in small fracture spacing cases. However even with calibration, in cases of large fracture spacing, the dual-porosity model is unable to match analytical solutions and fine-grid results

Synthesis Of -Tcp Powder Via Wet Precipitation And Hydrothermal Methods

Matlamat kajian ini adalah untuk mensintesis β-TCP [β-Ca3(PO4)2] menggunakan Ca(OH)2 dan H3PO4 sebagai bahan mula. The purpose of this study is to synthesize β-TCP [β-Ca3(PO4)2] using Ca(OH)2 and H3PO4 as the starting material

PROMOTING ASPECT OF PALLADIUM NANOPARTICLES ON SPINEL Pd@CuCr2O4/γ–Al2O3 CATALYTIC SYSTEM IN CARBON MONOXIDE OXIDATION

In this report, the promoting aspect of Pd on the activity of spinel CuCr2O4 and Pd catalytic systems in CO oxidation is investigated. Catalysts with compositions of 10 % spinel CuCr2O4 synthesized via modified sol–gel in situ on γ–Al2O3 support and Pd nanoparticles (0.11 ÷ 0.68) % then decorated on CuCr2O4/γ–Al2O3 via impregnation method by decomposed palladium (II) acetate solution at 280 °C for 2 h. Promoting aspect of Pd nanoparticles evaluating by Temperature Program Surface Reaction (TPSR) method in temperature range of 30 ÷ 450 °C and 15 L.h–1 flow gases consist of 1 % CO, 20 % O2 and 79 % N2 on 0.100 g catalysts. The experimental results reveal that the as–prepared materials completely convert CO at temperatures below 140 °C with 0.68 % Pd compare to 300 °C without Pd in the component. CO conversion highly increases with increasing amounts of Pd, with gas hourly space velocity reached by 1500 L.h–1.g–1 that exhibits promising application of these catalytic systems in exhausts treatment containing CO at low temperatures

HUMAN RESOURCES DEVELOPMENT IN VIETNAM: CURRENT SITUATION AND SOLUTIONS

There is a cause & effect relationship between human resources, capital, natural resources, technical infrastructure, science & technology, etc. However, human resources are considered the endogenous factor that dominates other resources as well as the process of socioeconomic development of each country. Compared to other resources, human resources, in which intellectual and grey matter are prominent characteristics, have the outstanding advantage of not being exhausted if they can be fostered, exploited and used properly; while other resources, no matter how much, are limited and can only prove their usefulness by being combined with human resources effectively. Human resources are the factor that decides the exploitation, use, protection and regeneration of other resources; in which, high-quality human resources determine the socioeconomic growth and development of each country. JEL: J24; O15 Article visualizations

LIFE OF WORKERS AT INDUSTRIAL PARKS AND EXPORT PROCESSING ZONES IN VIETNAM – CURRENT SITUATION AND SOLUTIONS

After decades of renovation, the rapid development of our country's industry has resulted in a rapid increase in the number of workers working at industrial parks and export processing zones. In addition to advantages, such as skill level, sense of style, discipline, income, etc. of workers have increased, there are also many problems, namely accommodation, learning opportunity, mental and recreational life of workers are not guaranteed. At the same time, the existing risk of a generation of workers who "prematurely retire" and become a burden of unemployment of society is posing itself as a problem that is yet solved. Obviously, this problem required the attention of workers, business owners and state management agencies alike; however, it cannot be dealt with after one night. The fact that a considerably large number of workers who are just rushing to work for money, satisfied with a barely enough living conditions and accept that these difficulties drag on will persist unless the government and the entire society soon have appropriate solutions. Article visualizations

Synthesis Of B-TCP Powder Via Wet Precipitation And Hydrothermal Methods [R857.M3 P534 2007 f rb].

Matlamat kajian ini adalah untuk mensintesis β-TCP [β-Ca3(PO4)2] menggunakan Ca(OH)2 dan H3PO4 sebagai bahan mula. Dua pendekatan telah digunakan dalam kajian ini untuk menghasilkan β-TCP, iaitu kaedah pemendakan basah dan kaedah hidtroterma. The purpose of this study is to synthesize β-TCP [β-Ca3(PO4)2] using Ca(OH)2 and H3PO4 as the starting material. Two approaches were used in this work to produce β-TCP, namely a precipitation method and a hydrothermal method

Consumer Behavior, Attitude and Perception Toward Modern Trade Stores in Rural Vietnam

Modern trade stores have been very successful in Vietnamese retail industry, espe-cially in some big cities. However, the popularity of such stores is still lagging behindthe traditional stores. In regard with this issue, many studies have been done overtime, but very few have been focused on rural regions in emerging countries likeVietnam. Thus, this study aims at exploring the reasons why Vietnamese consumersin the remote area prefer to shop at traditional stores instead of modern stores. Fur-thermore, this study attempts to fill the gap between these two types of formats. Theresearch uses quantitative method with the aid of SPSS software to analyze the data.The results show that consumers in the remote areas are still not willing to quit theirtraditional shopping habits for a new choice of store based on the current situation.Therefore, it is not the right time for investors to expand their modern business intothe country’s rural areas.Keywords: Modern Trade Store, Traditional Store, Rural Vietnam, Retail Industry,Consumer Behavior, Store Attributes

Influence of temperature on mechanical characteristics of 1018 low carbon steel estimated by ultrasonic non-destructive testing method

The temperature dependence of ultrasonic velocities propagated in low carbon steel 1018 has been investigated by the A-scan mode of the ultrasonic non-destructive testing method. Experimental results show that these velocities are linearly dependent on temperature of the carbon steel sample in the range of 0 to 50 °C. Based on the experimental velocities of the longitudinal wave and the shear one, mechanical characteristics of this carbon steel including Poisson's ratio (υ), Young’s modulus (E), shear modulus (G), and bulk modulus (K) have been calculated. These mechanical characteristics have also been linear response with respect to the increase of sample’s temperature. By using linear fitting approach, the temperature dependence coefficients of these mechanical characteristics have been analyzed and estimated to be 9.76×10-6/°C, −0.057 GPa/°C, −0.023 GPa/°C, and −0.038 GPa/°C for v, E, G, and K, respectively. It is concluded that the influence of the temperature on the mechanical properties of the carbon steels is necessary determined due to the improved accuracy of the ultrasonic testing method

Sustainable Decision Making in The Time of Uncertainty: Does Moral Intelligence Make It Different?

Background: The cybersecurity has been pondered as a great concern for professionals, legislators as well as all decision-makers and effectiveness of accounting information system (EAIS) has long been well-acknowledged as the prerequisite organizational management. Against this backdrop, big data analytics capabilities (BDAC) will become a must-have element of any fruitful cybersecurity resolution and organizational EAIS to enable public sector to achieve sustainable decision-making (SDM) in operation within the time of uncertainty. This research aims at investigating the interconnection between BDAC and SDM. It also delves into the mediation mechanism of EAIS and cybersecurity risk management (CRM) in the linkage between BDAC and SDM. Outstandingly, it examines whether the interconnections between these aforementioned components varies resting on specific degree of moral intelligence (MI). Method: The structural equation modeling is employed to investigate the statistical data captured from paper-and-pencil survey circulated to a convenience and snowball sample of 683 respondents in the Southern areas of Vietnam. Additionally, the multi-group analysis is applied to examine the moderating impact of MI. Results: The results analysis substantiates the markedly positive interconnection between BDAC and SDM. Simultaneously, this interconnection is partially mediated by CRM and EAIS. One of the most noteworthy observations is the moderating role of MI as a catalyst in enabling public sector to achieve SDM. Conclusion: The study\u27s findings provide important, realistic, and useful theoretical contributions to the current literature on the issue, as well as beneficial inputs for practitioners. Accordingly, these findings recommend that practitioners and policy-makers can benefit from enhancing BDAC and EAIS as well as implementing CRM, which are proactive measures to achieve SDM. Also increasing MI of accountants as an effective solution to foster the advantages of big data analytics, accounting information system and CRM to succeed in SDM