8,492 research outputs found
Influence of permanent dipole and dynamic core-electron polarization on tunneling ionization of polar molecules
No full textCitation: Hoang, V. H., Zhao, S. F., Le, V. H., & Le, A. T. (2017). Influence of permanent dipole and dynamic core-electron polarization on tunneling ionization of polar molecules. Physical Review A, 95(2), 8. doi:10.1103/PhysRevA.95.023407We present a detailed theoretical investigation on strong-field ionization of polar (CO and NO) as well as nonpolar molecules (N-2, O-2, and CO2). Our results indicate that accounting for the Stark correction in the molecular tunneling ionization theory leads to overall fairly good agreements with numerical solutions of the time-dependent Schrodinger equation. Furthermore, we show that the effect of dynamic core-electron polarization, in general, has a weak influence on the angle-dependent ionization probability. However, in the case of CO we confirm the recent finding by B. Zhang, J. Yuan, and Z. Zhao [Phys. Rev. Lett. 111, 163001 (2013)] that accounting for dynamic core-polarization is crucial to achieving an overall good agreement with experiments
Workaholism of the Vietnamese minority in the Czech Republic
No full textThe main aim of the bachelor’s thesis was to determine wether Vietnamese minority in the Czech Republic suffers form work addiction due to their excessive workload. Data collection was carried out by the survey specially created for the purposes of the bachelor’s thesis. Czech version of the Work addiction risk test by Dr. Robinson served as the basis for the survey and the research sample consisted of 520 individuals. Based on the research, it is possible to conclude that about 80 % of the respondents suffer from workaholism, which means that in a long term view, Vietnamse workaholics are likely to develop physical and psychological diseases. Research also indicates that the diagnosed workaholism of the Vietnamese minority does not relate to either sex, age or industustry, in which respondents work.Práce se zabývá diagnostikou workoholismu u vietnamské menšiny v České republice, která je provedena pomocí dotazníkové šetření. Workoholismus představuje chorobnou závislost na práci a výkonu. Základ dotazníkového šetření tvoří Dotazník závislosti – workoholismus obsažený na stránkách Národního zdravotnického informačního portálu, který vychází z Testu rizika závislosti na práci od amerického profesora psychologie Robinsona. Výzkumný soubor se sestává z 520 osob a z výsledků praktické části bakalářské vyplývá, že až 80 % respondentů trpí workoholismem. Pracovní nasazení menšiny je z dlouhodobého hlediska negativní a může způsobit řadu tělesných a duševních chorob. Dále vyšlo najevo, že projevy workoholismu nezávisí na věku, pohlaví, ani na odvětví, v němž Vietnamci pracují
Health and access to health services of rural-to-urban migrant populations in Viet Nam
No full textViet Nam has increasing internal migration since the Renovation (Doi Moi) in 1986. Migration flows – particularly rural-to-urban migration – have positive and negative effects to migrants, their family, and socio-economics in their places of origin and of destination. On the one hand, migration is an opportunity for improving wages of migrants, for ensuring economic security of their family, and for contributing to social and economic developments of the country. On the other hand, migration bears risks to migrants – especially health-related risks – and pressures on infrastructure development and social services at destinations. Many studies on health issues of migrants suggested that rural-to-urban migrants are more vulnerable to ill-health and have less access to health services than non-migrants. However, studies up to date did not use population-based and comparative approaches between migrant and non-migrant populations nor validated study tools. The studies of this dissertation examined the health status of non-migrants and 03 groups of rural-to-urban migrants: migrants working in industrial zones (IZ), migrants working in private small enterprise (PSE), and seasonal migrants. In addition, studies have assessed the access to health services and identified barriers to the access of migrants.
The dissertation used a mixed qualitative-quantitative approach in four subsequent study phases. Phase 1 analyzed secondary data from the 1989, 1999, and 2009 national censuses to characterize trends and patterns of rural-to-urban migration in Viet Nam. We could show that inter-provincial migration flows have changed dramatically over time. There was an increase in relative and absolute migration flows, an inversion of the male-female ratio with higher proportions of women in 2009 than in previous years, and a decrease in the average age of migrants. We could also confirm the relationship between migration and provincial socio-economic status (i.e. monthly income per capita) and urbanization (i.e. proportion of urban population). These findings reflect an unequally growing labor market in Vietnamese provinces. The increase of migration flows challenges the national health system to ensure access to health care services and health insurances, as well as to develop health services adapted to these populations.
In Phase 2 we have evaluated the health status of migrants by using the Short Form 36 version 2 (SF-36v2). The SF-36v2 is a validated and widely used health status assessment form. In this phase, we have also compared health status and the access to health services of migrants with those of non-migrants. Findings confirmed the reliability of the Vietnamese SF-36v2. Findings also showed that seasonal migrants were more likely to have physical ill-health than other groups, while migrants working in IZ were more likely to have mental ill-health than non-migrants and other migrant populations. Health insurance registration was an important factor related to the utilization of health care services and migrants were less likely to use health services than non-migrants in the same municipalities.
Among migrant populations, seasonal migrants had the lowest health service utilization frequency. Indeed, low income is the main obstacle of the utilization of health care services for seasonal migrants. The outcomes of this are that they pay less attention to their health, attend in available health programs at the destination, and are less health care insured. These, in return, encourage self-treatment of seasonal migrants.
Findings from Phase 1 and Phase 2 also showed that female migrants accounted for the highest proportion of the whole migrant population. They faced many health risks, particularly reproductive health of female migrants working in IZ. Phase 3, therefore, focused on the evaluation of access to health services for reproductive tract infections (RTIs) among female migrants working in IZ. Findings of this phase showed that health insurance was an important factor influencing the utilization of health services, but also social-cultural factors such as traditional norms – that integrate reproductive health problems with sexual relationship. The latter led to shame of female migrants to seek health services for RTIs and other reproductive health services. Finally, in Phase 4, we have designed an intervention proposal for improved utilization of reproductive health services for female migrants aged 18-49 working in IZ in Viet Nam. This intervention program will use available resources and should increase health insurance coverage and their application to reproductive health care services of female migrants. It also aims to increase knowledge of these health issues and possibilities of the access to health care services of female migrants.
Based on the findings of my dissertation, I could formulate recommendations for future interventions and research, for policy makers, health service providers at destination, employers of migrants, and migrants. Briefly, policy makers should recognize that migrants are vulnerable to ill-health, including both physical and mental health. For specific interventions such as reproductive health (e.g. RTIs) they are a priority group. Health service providers should integrate adapted health programs for migrants into their routine health programs, for example, periodic gynaecological examination programs, expanded program on immunization (EPI), and other health promotion programs – which better ensures sustainability of intervention programs. Employers should comply with laws of social and health insurance for employees, especially migrant employees. Moreover, they should strengthen the capacity of their health care units and collaborate with local health systems to provide health care services to migrant employees. Finally, migrants should register for temporary residence at the destination because this will provide them rights in accessing social and health services. Also, they should have knowledge about benefits of health insurance and available kinds of health insurances. Migrants should have better access to health promotion programs and pay more attention to their health
Workaholism of the Vietnamese minority in the Czech Republic
No full textThe main aim of the bachelor’s thesis was to determine wether Vietnamese minority in the Czech Republic suffers form work addiction due to their excessive workload. Data collection was carried out by the survey specially created for the purposes of the bachelor’s thesis. Czech version of the Work addiction risk test by Dr. Robinson served as the basis for the survey and the research sample consisted of 520 individuals. Based on the research, it is possible to conclude that about 80 % of the respondents suffer from workaholism, which means that in a long term view, Vietnamse workaholics are likely to develop physical and psychological diseases. Research also indicates that the diagnosed workaholism of the Vietnamese minority does not relate to either sex, age or industustry, in which respondents work.Práce se zabývá diagnostikou workoholismu u vietnamské menšiny v České republice, která je provedena pomocí dotazníkové šetření. Workoholismus představuje chorobnou závislost na práci a výkonu. Základ dotazníkového šetření tvoří Dotazník závislosti – workoholismus obsažený na stránkách Národního zdravotnického informačního portálu, který vychází z Testu rizika závislosti na práci od amerického profesora psychologie Robinsona. Výzkumný soubor se sestává z 520 osob a z výsledků praktické části bakalářské vyplývá, že až 80 % respondentů trpí workoholismem. Pracovní nasazení menšiny je z dlouhodobého hlediska negativní a může způsobit řadu tělesných a duševních chorob. Dále vyšlo najevo, že projevy workoholismu nezávisí na věku, pohlaví, ani na odvětví, v němž Vietnamci pracují
Retrieval of target structure information from laser-induced photoelectrons by few-cycle bicircular laser fields
No full textCitation: Hoang, V. H., Le, V. H., Lin, C. D., & Le, A. T. (2017). Retrieval of target structure information from laser-induced photoelectrons by few-cycle bicircular laser fields. Physical Review A, 95(3), 6. doi:10.1103/PhysRevA.95.031402By analyzing theoretical results from a numerical solution of the time-dependent Schrodinger equation for atoms in few-cycle bicircular laser pulses, we show that high-energy photoelectron momentum spectra can be used to extract accurate elastic scattering differential cross sections of the target ion with free electrons. We find that the retrieval range for a scattering angle with bicircular pulses is wider than with linearly polarized pulses, although the retrieval method has to be modified to account for different returning directions of the electron in the continuum. This result can be used to extend the range of applicability of ultrafast imaging techniques such as laser-induced electron diffraction and for the accurate characterization of laser pulses
Bridging the lesioned spinal cord using hydrogel
No full textI. INTRODUCTION 1
A. Spinal Cord Injury 1
B. Cavity formation and the importance of bridging lesion after spinal cord injury. 2
C. Bridging cavity using biomaterials 3
D. Injectable hydrogel for contusive injury model 4
E. Aims of Study 5
II. MATERIALS AND METHODS 6
1. Animal and surgical procedures 6
2. Poly (phosphazene) hydrogel injection 6
3. Tissue processing 6
4. Immunohistochemistry 7
5. Three dimensional reconstruction of lesion cavity 7
6. Zymography 7
7. Behavioral assessment 8
III. RESULTS 10
1. Hydrogel injection prevent cavity formation after contusive spinal cord injury 10
2. Hydrogel injection suppress microglial activation 4 week after injection 14
3. Remodelling of extracellular matrix by I-5 injection 16
4. Matrixmetallo-proteinase-9 ( MMP-9) involved in ECM remodelling 20
5. Perivascular fibroblasts are a major source of the newly formed ECM at 1 and 4 week 23
6. I-5 injection promotes functional recovery 25
IV. DISCUSSION 28
V. CONCLUSION 31Maste
Specifics of trade and business in Vietnam on example of a selected company
No full textThe aim of the thesis is to provide information on current business enviroment in Vietnam. Besides, it also focuses on people's mentality, negotiation habits and specific cultural differences
Intertwined Titanium Carbide MXene within a 3 D Tangled Polypyrrole Nanowires Matrix for Enhanced Supercapacitor Performances
No full textThe exploration of the rational design and synthesis of unique and robust architectured electrodes for the high capacitance, rate capability, and stability of supercapacitors is crucial to the future of energy storage technology. Herein, an in situ synthesis of multilayered titanium carbide MXene tightly caging within a 3 D conducting tangled polypyrrole (PPy) nanowire (NW) network is proposed as an effective strategy to prevent the aggregation of MXene, profoundly enhancing the electrochemical performance of the supercapacitor. Owing to the beneficial effects of an ideal 3 D interconnected porous structure and high electrical conductivity, the obtained electrode exhibits fast charge and ion transport kinetics as well as full usage of active material. As expected, the 3 D Ti3C2Tx@PPY NW exhibits a specific capacitance five times higher than that of pristine MXene (610 F g(-1)), a good rate capability up to a current density of 25 A g(-1), and excellent stability with 100 % retention after 14 000 cycles at 4 A g(-1), outperforming the known state-of-the-art MXene-based supercapacitor. Our work provides a facile method for enhancing the performance of MXene-based energy storage devices. (c) 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Leptomischus anisophyllus T. P. Anh, B. H. Quang, Nuraliev & L. Wu 2021, sp. nov.
No full textLeptomischus anisophyllus T.P.Anh, B.H.Quang, Nuraliev & L.Wu, sp. nov. (Figs. 1, 2) Diagnosis: —Similar to Leptomischus erianthus, L. funingensis, L. hiepii and L. parviflorus, differing from them and from the other species of Leptomischus by the following combination of morphological traits: stems terete, pubescent when young, leaves mostly strongly anisophyllous, flowers distylous, corolla tube 10–15 mm long. Type: — VIETNAM. Nghe An Province: Con Cuong District, Luc Da Commune, Pu Mat National Park, Kem waterfall area, 18°58’11.1’’N 104°48’01.9’’E, 261 m, 18 February 2017, H. Q . Bui 203 (holotype: HN; isotypes: CSFI, HN, LE, MW).Published as part of Anh, Tran Thi Phuong, Quang, Bui Hong, Nuraliev, Maxim S., Nguyen, Khang Sinh & Averyanov, Leonid V., 2021, Leptomischus anisophyllus (Argostemmateae: Rubiaceae), a new species from Vietnam, pp. 198-204 in Phytotaxa 507 (2) on page 199, DOI: 10.11646/phytotaxa.507.2.8, http://zenodo.org/record/542565
Specifics of trade and business in Vietnam on example of a selected company
No full textCílem práce je poskytnout informace týkající se specifik současného podnikatelského prostředí ve Vietnamu. Dále pak přiblížit zvláštnosti kulturních a obchodních zvyklostí a tyto zvyklosti následně demonstrovat nebo vyvrátit na příkladu vybrané firmy.The aim of the thesis is to provide information on current business enviroment in Vietnam. Besides, it also focuses on people's mentality, negotiation habits and specific cultural differences
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