Pub Date : 2023-08-11DOI: 10.15625/0868-3166/18278
Thi Lan Anh Hoang, Minh Trung Nguyen, Thi Kieu Anh Do, Le Thi Thanh Dang, Vu Diem Ngoc Tran, Thi Ngoc Tram Do, D. Nguyen
A facile approach was employed for the synthesis of cobalt oxide nanorods (NRs) using cobalt nitrate, sodium oxalate and ethylene glycol as precursors via a hydrothermal process. The hydrothermal conditions, such as temperature and time, were varied to optimize the morphological characteristics of the NRs. After undergoing filtration, washing, and drying, the resulting material was characterized using several techniques, including field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and transmission electron microscopy (TEM). Our findings reveal that the NRs exhibit diverse morphologies, depending on the hydrothermal conditions, with the smallest aspect ratio observed when prepared at 200 °C for 24 hours. In addition, we investigated the gas sensing capabilities of the NRs to ammonia under these conditions.
{"title":"Effect of synthesis parameters on cobalt oxide nanostructures morphology","authors":"Thi Lan Anh Hoang, Minh Trung Nguyen, Thi Kieu Anh Do, Le Thi Thanh Dang, Vu Diem Ngoc Tran, Thi Ngoc Tram Do, D. Nguyen","doi":"10.15625/0868-3166/18278","DOIUrl":"https://doi.org/10.15625/0868-3166/18278","url":null,"abstract":"A facile approach was employed for the synthesis of cobalt oxide nanorods (NRs) using cobalt nitrate, sodium oxalate and ethylene glycol as precursors via a hydrothermal process. The hydrothermal conditions, such as temperature and time, were varied to optimize the morphological characteristics of the NRs. After undergoing filtration, washing, and drying, the resulting material was characterized using several techniques, including field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and transmission electron microscopy (TEM). Our findings reveal that the NRs exhibit diverse morphologies, depending on the hydrothermal conditions, with the smallest aspect ratio observed when prepared at 200 °C for 24 hours. In addition, we investigated the gas sensing capabilities of the NRs to ammonia under these conditions.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85208136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-10DOI: 10.15625/0868-3166/18218
Loan Nguyen, Haidang Phan, H. Nguyen
In this paper, we investigate the asymmetry of holes tunneling through GaMnAs/GaAs/GaMnAs heterostructures in the cases general, where the magnetization of the two electrodes are not colinear and their magnitude are not equal. The six-bands $textbf{k.p}$ Hamiltonian is employed to describe the holes in the GaAs and GaMnAs layers, taking into account both spin-orbit and exchange interactions. The multi-band transfer-matrix formalism is applied for numerically solving the Schrodinger equation to derive the hole wave transmission. We then calculate the transmission asymmetry and discuss its dependence on the right electrode magnetization magnitude, as well as the angles determining relatively the orientation of two magnetization vectors. The study may provide the insights into dynamic of Anomalous Tunneling Hall current during magnetization switching process which are important in spintronics technology for device design and measurement.
{"title":"Asymmetric tunneling of holes through a semiconductor junction in an arbitrary magnetization configuration","authors":"Loan Nguyen, Haidang Phan, H. Nguyen","doi":"10.15625/0868-3166/18218","DOIUrl":"https://doi.org/10.15625/0868-3166/18218","url":null,"abstract":"In this paper, we investigate the asymmetry of holes tunneling through GaMnAs/GaAs/GaMnAs heterostructures in the cases general, where the magnetization of the two electrodes are not colinear and their magnitude are not equal. The six-bands $textbf{k.p}$ Hamiltonian is employed to describe the holes in the GaAs and GaMnAs layers, taking into account both spin-orbit and exchange interactions. The multi-band transfer-matrix formalism is applied for numerically solving the Schrodinger equation to derive the hole wave transmission. We then calculate the transmission asymmetry and discuss its dependence on the right electrode magnetization magnitude, as well as the angles determining relatively the orientation of two magnetization vectors. The study may provide the insights into dynamic of Anomalous Tunneling Hall current during magnetization switching process which are important in spintronics technology for device design and measurement.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"100 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76873324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.15625/0868-3166/18226
Huong Nguyen, Thao Do, Nghia Nguyen Trong, Nga Nguyen Thi, L. Pham Thi, Phuong Ha Thi, Nghia Nguyen Van, D. Vu, Huong Tran Thu, Anh Tran Kim, Quoc Minh Le
Rare earth photonic nanomaterials are increasingly prominently applied in various fields of biomedicine. Currently, there is greater focus on the investigation to control the size and shape of nanomaterials, including the nanospherical form, which allows for precise labeling by only one nanoparticle. This paper demonstrates, for the first time, the construction of a biological nanospherical probe (BNSP) Gd2O3: Yb3+, Er3+/Silica/NH/mAb^CD133 for diagnostic labeling of cancer stem cells (CSCs) NTERA-2. The BNSP was constructed using highly monodisperse spheres with around 200nm uniform size of Gd2O3: 7.6% Yb3+, 1.6% Er3+. They were functionalized by an amine group-contained shell coating and conjugated with CD133 monoclonal antibody. The functionalized nanosphere Gd2O3: Yb, Er/silica/NH2 showed strong upconversion luminescence in red color upon laser excitation in the near-infrared region at 975 nm. The Gd2O3: Yb3+, Er3+/silica/NH2 was carefully implemented to conjugate mAb^CD133 via a linker, glutaraldehyde, to obtain the predictable probe Gd2O3: Yb3+, Er3+/Silica/NH/mAb^CD133. Then, this BNSP was tested in vitro for its capacity to label NTERA-2 cancer stem cells. The efficient labeling based on the fluorescent immunoassay method was detected by incorporating a nanophotometer, Field Energy Scan Electron Microscopy (FESEM), and precisely determined by fluorescent microscopy. The study shows that the BNSP is highly efficient with targeting capacity and specificity in the labeling of cancer stem cells. These advanced results open up promising avenues for the development of precise imaging diagnostics in cancer cellular biomedicine, and beyond.
{"title":"Optic bionanospherical probe from Gd(_2)O(_3): Yb, Er upconverting nanosphere and mAb^CD133 antibody for precise imaging label of cancer stem cell NTERA-2","authors":"Huong Nguyen, Thao Do, Nghia Nguyen Trong, Nga Nguyen Thi, L. Pham Thi, Phuong Ha Thi, Nghia Nguyen Van, D. Vu, Huong Tran Thu, Anh Tran Kim, Quoc Minh Le","doi":"10.15625/0868-3166/18226","DOIUrl":"https://doi.org/10.15625/0868-3166/18226","url":null,"abstract":"Rare earth photonic nanomaterials are increasingly prominently applied in various fields of biomedicine. Currently, there is greater focus on the investigation to control the size and shape of nanomaterials, including the nanospherical form, which allows for precise labeling by only one nanoparticle. This paper demonstrates, for the first time, the construction of a biological nanospherical probe (BNSP) Gd2O3: Yb3+, Er3+/Silica/NH/mAb^CD133 for diagnostic labeling of cancer stem cells (CSCs) NTERA-2. The BNSP was constructed using highly monodisperse spheres with around 200nm uniform size of Gd2O3: 7.6% Yb3+, 1.6% Er3+. They were functionalized by an amine group-contained shell coating and conjugated with CD133 monoclonal antibody. The functionalized nanosphere Gd2O3: Yb, Er/silica/NH2 showed strong upconversion luminescence in red color upon laser excitation in the near-infrared region at 975 nm. The Gd2O3: Yb3+, Er3+/silica/NH2 was carefully implemented to conjugate mAb^CD133 via a linker, glutaraldehyde, to obtain the predictable probe Gd2O3: Yb3+, Er3+/Silica/NH/mAb^CD133. Then, this BNSP was tested in vitro for its capacity to label NTERA-2 cancer stem cells. The efficient labeling based on the fluorescent immunoassay method was detected by incorporating a nanophotometer, Field Energy Scan Electron Microscopy (FESEM), and precisely determined by fluorescent microscopy. The study shows that the BNSP is highly efficient with targeting capacity and specificity in the labeling of cancer stem cells. These advanced results open up promising avenues for the development of precise imaging diagnostics in cancer cellular biomedicine, and beyond.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87691931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.15625/0868-3166/18152
Khoa Cao Tien, Van Dinh Thuy, Huong Dang Thi, Quang Phan Dinh, Hue Do Thi
Spilanthes acmella L. Murr is a medicinal herb with many valuable biological activities such as clearing heat, detoxifying, dissipating phlegm, antiseptic, pain relief, antifungal, anti-inflammatory... In this work, we used Spilanthes acmella L. Murr extract to synthesize silver nanoparticles to combine and enhance the activity of silver and Spilanthes acmella L. Murr extract in antibacterial and antifungal activities. The reaction parameters were investigated to find the most optimal conditions for synthesizing silver nanoparticles, such as AgNO3 volume, solution pH, and reaction temperature. UV-VIS absorption spectra were used to analyze the influence of the reaction parameters. The functional groups on the silver nanoparticles as well as the Spilanthes acmella L. Murr extract were found by infrared absorption (FTIR) spectroscopy. The crystal structure of the synthesized silver nanoparticles was determined by X-ray diffraction (XRD) spectroscopy. On the basis of the synthesized silver nanoparticles, the antifungal activity was investigated on the strains: A. flavus (Af), A. brasiliensis (Ab), C. Albicans (Ca), and antibacterial: Staphylococcus aureus (SA), Pseudomonas aeruginosa (PA) was performed to compare the activity of the antibiotic ampicillin 100 mg/mL.
{"title":"Silver nanoparticles synthesized from Spilanthes acmella L. Murr extract using antifungal and antibacterial","authors":"Khoa Cao Tien, Van Dinh Thuy, Huong Dang Thi, Quang Phan Dinh, Hue Do Thi","doi":"10.15625/0868-3166/18152","DOIUrl":"https://doi.org/10.15625/0868-3166/18152","url":null,"abstract":"Spilanthes acmella L. Murr is a medicinal herb with many valuable biological activities such as clearing heat, detoxifying, dissipating phlegm, antiseptic, pain relief, antifungal, anti-inflammatory... In this work, we used Spilanthes acmella L. Murr extract to synthesize silver nanoparticles to combine and enhance the activity of silver and Spilanthes acmella L. Murr extract in antibacterial and antifungal activities. The reaction parameters were investigated to find the most optimal conditions for synthesizing silver nanoparticles, such as AgNO3 volume, solution pH, and reaction temperature. UV-VIS absorption spectra were used to analyze the influence of the reaction parameters. The functional groups on the silver nanoparticles as well as the Spilanthes acmella L. Murr extract were found by infrared absorption (FTIR) spectroscopy. The crystal structure of the synthesized silver nanoparticles was determined by X-ray diffraction (XRD) spectroscopy. On the basis of the synthesized silver nanoparticles, the antifungal activity was investigated on the strains: A. flavus (Af), A. brasiliensis (Ab), C. Albicans (Ca), and antibacterial: Staphylococcus aureus (SA), Pseudomonas aeruginosa (PA) was performed to compare the activity of the antibiotic ampicillin 100 mg/mL.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86864032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-28DOI: 10.15625/0868-3166/18082
P. H. Khiem
We present analytic results for one-loop radiative corrections to off-shell decay (H^* rightarrow W^+W^-) in 't Hooft-Veltman gauge within the Standard Model framework. In numerical results, we show off-shell decay rate and its corrections with varying off-shell Higgs mass. The results show that the corrections are of 10% contributions to the total decay rates. Furthermore, we study the impacts of one-loop radiative corrections to the off-shell decay (H^* rightarrow W^+W^-) in Higgs processes at future colliders. The signal processes such as (e^-e^+rightarrow ZH^*rightarrow Z(WW)) with including the initial beam polarizations and (e^-e^+rightarrow nu_ebar{nu}_e H^* rightarrow nu_ebar{nu}_e (WW)) and (e^-gamma rightarrow e^-H^* rightarrow e^-WW) are examined. We find that the effects are visible impacts and these should be taken into account at future colliders.
我们给出了在标准模型框架下Hooft-Veltman规范中离壳衰变(H^* rightarrow W^+W^-)的单环辐射修正的分析结果。在数值结果中，我们显示了离壳衰变率及其随离壳希格斯质量变化的修正。结果表明，校正值为10% contributions to the total decay rates. Furthermore, we study the impacts of one-loop radiative corrections to the off-shell decay (H^* rightarrow W^+W^-) in Higgs processes at future colliders. The signal processes such as (e^-e^+rightarrow ZH^*rightarrow Z(WW)) with including the initial beam polarizations and (e^-e^+rightarrow nu_ebar{nu}_e H^* rightarrow nu_ebar{nu}_e (WW)) and (e^-gamma rightarrow e^-H^* rightarrow e^-WW) are examined. We find that the effects are visible impacts and these should be taken into account at future colliders.
{"title":"One-loop formulas for off-shell decay (H^* rightarrow W^+W^-) in 't Hooft-Veltman gauge and its applications","authors":"P. H. Khiem","doi":"10.15625/0868-3166/18082","DOIUrl":"https://doi.org/10.15625/0868-3166/18082","url":null,"abstract":"We present analytic results for one-loop radiative corrections to off-shell decay (H^* rightarrow W^+W^-) in 't Hooft-Veltman gauge within the Standard Model framework. In numerical results, we show off-shell decay rate and its corrections with varying off-shell Higgs mass. The results show that the corrections are of 10% contributions to the total decay rates. Furthermore, we study the impacts of one-loop radiative corrections to the off-shell decay (H^* rightarrow W^+W^-) in Higgs processes at future colliders. The signal processes such as (e^-e^+rightarrow ZH^*rightarrow Z(WW)) with including the initial beam polarizations and (e^-e^+rightarrow nu_ebar{nu}_e H^* rightarrow nu_ebar{nu}_e (WW)) and (e^-gamma rightarrow e^-H^* rightarrow e^-WW) are examined. We find that the effects are visible impacts and these should be taken into account at future colliders.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74485442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-28DOI: 10.15625/0868-3166/18088
K. H. Phan, D. Tran, Anh Thu Nguyen
We present one-loop formulas for contributing to the HZZ vertex in ’t Hooft-Veltmangauge within Standard Model framework. One-loop off-shell Higgs decay rates to Z-pair areinvestigated in both unpolarized and longitudinal polarization for Z bosons in final state. Thecorrections are range of 7% to 8.4% when we vary the off-shell Higgs mass from 200 GeV to500 GeV. In applications, we study off-shell Higgs decay H ∗ → ZZ in the Higgs productions atfuture colliders such as the signal processes γ ∗ (Q2 )γ → H ∗ → ZZ and e− γ → e− H ∗ → e− ZZ areanalyzed.
{"title":"ONE-LOOP OFF-SHELL DECAY H∗ → ZZ AT FUTURE COLLIDERS","authors":"K. H. Phan, D. Tran, Anh Thu Nguyen","doi":"10.15625/0868-3166/18088","DOIUrl":"https://doi.org/10.15625/0868-3166/18088","url":null,"abstract":"We present one-loop formulas for contributing to the HZZ vertex in ’t Hooft-Veltmangauge within Standard Model framework. One-loop off-shell Higgs decay rates to Z-pair areinvestigated in both unpolarized and longitudinal polarization for Z bosons in final state. Thecorrections are range of 7% to 8.4% when we vary the off-shell Higgs mass from 200 GeV to500 GeV. In applications, we study off-shell Higgs decay H ∗ → ZZ in the Higgs productions atfuture colliders such as the signal processes γ ∗ (Q2 )γ → H ∗ → ZZ and e− γ → e− H ∗ → e− ZZ areanalyzed.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86700176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-10DOI: 10.15625/0868-3166/17901
V. H. Nguyen, T. N. Pham Thi, Thang Nguyen Toan
We study the effect of quantum and thermal fluctuations on the excitation energy spectrum and sublattice magnetization of the 1200 ordered phase of the spin-1 antiferromagnetic Heisenberg model on a triangular lattice with nearest J1 and next-nearest-neighbor J2 exchange interactions. The auxiliary fermionic representation of the spin operators within a functional integral formalism with an imaginary Lagrange multiplier is employed to retain an exact constraint of single particle occupancy. Representing the classical ground state by Luttinger-Tisza ordering vector Q one may consider the fluctuation contributions to the free energy of the system in the entire range of the coupling parameters. We derived the magnon spectrum in one-loop approximation and the magnetization taking into account thermal fluctuations. The obtained results are compared with the result of the linear spin-wave approximation and experimental findings on compound NiGa2S4.
{"title":"The (120^{0}) ordered phase of the spin-1 (J_{1} - J_{2}) antiferromagnetic Heisenbeberg model on a triangular lattice","authors":"V. H. Nguyen, T. N. Pham Thi, Thang Nguyen Toan","doi":"10.15625/0868-3166/17901","DOIUrl":"https://doi.org/10.15625/0868-3166/17901","url":null,"abstract":"We study the effect of quantum and thermal fluctuations on the excitation energy spectrum and sublattice magnetization of the 1200 ordered phase of the spin-1 antiferromagnetic Heisenberg model on a triangular lattice with nearest J1 and next-nearest-neighbor J2 exchange interactions. The auxiliary fermionic representation of the spin operators within a functional integral formalism with an imaginary Lagrange multiplier is employed to retain an exact constraint of single particle occupancy. Representing the classical ground state by Luttinger-Tisza ordering vector Q one may consider the fluctuation contributions to the free energy of the system in the entire range of the coupling parameters. We derived the magnon spectrum in one-loop approximation and the magnetization taking into account thermal fluctuations. The obtained results are compared with the result of the linear spin-wave approximation and experimental findings on compound NiGa2S4.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90041414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-03DOI: 10.15625/0868-3166/18109
Oanh Nguyen, Phong H. Nguyen, N. Nguyen, C. T. Bach, H. D. Nguyen, G. Bach
We apply classical Monte Carlo simulation to examine the thermodynamic properties of perovskites described by the Ising model with competitive magnetic interactions. By correspondingly adjusting the ferromagnetic-interaction and antiferromagnetic-interaction probabilities, $p$ and $(1-p)$, in the regime $p ge 0.5$, the temperature dependence of magnetization, total energy, spin susceptibility, and specific heat consistently show a ferromagnetic to paramagnetic (FM-PM) phase transition at a critical temperature $T_c$. Besides, the inverse susceptibility is confirmed to follow Curie-Weiss's law above another critical temperature $T_{CW}$. By increasing the FM interaction probability, we have observed the FM-PM critical temperature $T_c$ shifted to the higher value while the Curie-Weiss critical temperature $T_{CW}$ moves to the lower. The different values between these two critical temperatures imply the inhomogeneity of the systems having phase separation, thus in agreement with the increased homogeneity with increasing $p$.
我们应用经典蒙特卡罗模拟研究了具有竞争性磁相互作用的伊辛模型所描述的钙钛矿的热力学性质。在p ge 0.5$中，通过相应调整铁磁相互作用和反铁磁相互作用概率$p$和$(1-p)$，磁化强度、总能量、自旋磁化率和比热的温度依赖关系一致地显示出临界温度$T_c$下铁磁向顺磁(FM-PM)相变。此外，在另一个临界温度$T_{CW}$以上，证实了磁化率逆符合居里-魏斯定律。通过增加FM相互作用的概率，我们观察到FM- pm临界温度$T_c$向较高的值移动，而Curie-Weiss临界温度$T_{CW}$向较低的值移动。这两个临界温度之间的不同值暗示了相分离体系的不均匀性，从而与随着p值的增加而增加的均匀性相一致。
{"title":"Monte Carlo investigation for an Ising model with competitive magnetic interactions in the dominant ferromagnetic-interaction regime","authors":"Oanh Nguyen, Phong H. Nguyen, N. Nguyen, C. T. Bach, H. D. Nguyen, G. Bach","doi":"10.15625/0868-3166/18109","DOIUrl":"https://doi.org/10.15625/0868-3166/18109","url":null,"abstract":"We apply classical Monte Carlo simulation to examine the thermodynamic properties of perovskites described by the Ising model with competitive magnetic interactions. By correspondingly adjusting the ferromagnetic-interaction and antiferromagnetic-interaction probabilities, $p$ and $(1-p)$, in the regime $p ge 0.5$, the temperature dependence of magnetization, total energy, spin susceptibility, and specific heat consistently show a ferromagnetic to paramagnetic (FM-PM) phase transition at a critical temperature $T_c$. Besides, the inverse susceptibility is confirmed to follow Curie-Weiss's law above another critical temperature $T_{CW}$. By increasing the FM interaction probability, we have observed the FM-PM critical temperature $T_c$ shifted to the higher value while the Curie-Weiss critical temperature $T_{CW}$ moves to the lower. The different values between these two critical temperatures imply the inhomogeneity of the systems having phase separation, thus in agreement with the increased homogeneity with increasing $p$.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79058089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-26DOI: 10.15625/0868-3166/17576
Van Soa Dang, M. Le, Đào Thị Bích Thủy
The influence of vector, scalar unparticle exchange and photon ((gamma)), (Z) boson, Higgs-radion ((h,phi)) exchange on the fundamental M(o)ller scattering in Randall-Sundrum model is presented. We evaluated the contribution from each exchange in standard model physics and unparticle physics to the final production cross-sections with the apposite energy reach in the current accelerators and colliders. The results indicate that the effect of vector unparticles is larger than its scalar all over the range of collision energy, as much greater than Higgs ((h)) and radion ((phi)) in the low energy. (Z) boson exchange also contributes the greatest to the process in both unpolarized and polarized conditions in higher energy regions when compared to photon exchange ((gamma)) which normally dominates at the lower energies.
{"title":"The contribution of unparticles to the M(o)ller scattering in the Randall-Sundrum model","authors":"Van Soa Dang, M. Le, Đào Thị Bích Thủy","doi":"10.15625/0868-3166/17576","DOIUrl":"https://doi.org/10.15625/0868-3166/17576","url":null,"abstract":"The influence of vector, scalar unparticle exchange and photon ((gamma)), (Z) boson, Higgs-radion ((h,phi)) exchange on the fundamental M(o)ller scattering in Randall-Sundrum model is presented. We evaluated the contribution from each exchange in standard model physics and unparticle physics to the final production cross-sections with the apposite energy reach in the current accelerators and colliders. The results indicate that the effect of vector unparticles is larger than its scalar all over the range of collision energy, as much greater than Higgs ((h)) and radion ((phi)) in the low energy. (Z) boson exchange also contributes the greatest to the process in both unpolarized and polarized conditions in higher energy regions when compared to photon exchange ((gamma)) which normally dominates at the lower energies.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88884805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-25DOI: 10.15625/0868-3166/17494
S. Cao, Ngoc Tran, V. Nguyen, Quyen Phan
One of the most abundant man-made sources of low energy (few~MeVs) neutrinos, reactor neutrino, is not only useful for studying neutrino properties, but it is also used in practical applications. In this study, we investigate the potential of using reactor neutrino detectors for nuclear safeguards in Vietnam, specifically at the Dalat Nuclear Reactor, a future research facility, and presumably commercial reactors with 500~kW, 10~MW, and 1000~MW thermal powers, respectively. We compute the rate of observed inverted beta decay events, as well as the statistical significance of extracting isotope composition under the practical assumptions of detector mass, detection efficiency, and background level. We find that a 1-ton detector mass can allow us to detect the reactor's on-off transition state from a few hours to a few days, depending on the standoff distance and reactor thermal power. We investigate how background and energy resolution affect the precision of the extracted weapon-usable (^{239})Pu isotope. We conclude that in order to distinguish the 10% variation of the (^{239})Pu in the 10~MW thermal power reactor, a 1-ton detector placed 50~m away must achieve 1% background level. Increasing the statistics by using a 10x larger detector or placing it (sqrt{10}) times closer to the reactor alleviates the requirement of the background level to 10%.
反应堆中微子是低能量(mev)中微子最丰富的人造来源之一，它不仅对研究中微子的性质有用，而且在实际应用中也有应用。在本研究中，我们调查了在越南核保障中使用反应堆中微子探测器的潜力，特别是在大叻核反应堆，一个未来的研究设施，以及可能分别具有500千瓦，10兆瓦和1000兆瓦热功率的商业反应堆。我们计算了观测到的倒β衰变事件的速率，以及在探测器质量、检测效率和背景水平的实际假设下提取同位素组成的统计显著性。我们发现，一个1吨的探测器质量可以让我们在几小时到几天内检测到反应堆的开关过渡状态，具体时间取决于距离和反应堆的热功率。我们研究背景和能量分辨率如何影响提取武器可用(^{239}) Pu同位素的精度。我们的结论是，为了区分10% variation of the (^{239})Pu in the 10~MW thermal power reactor, a 1-ton detector placed 50~m away must achieve 1% background level. Increasing the statistics by using a 10x larger detector or placing it (sqrt{10}) times closer to the reactor alleviates the requirement of the background level to 10%.
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