Hypocalcemia is an important and common complication following thyroid surgery. The development of postoperative hypocalcemia is likely to be multifactorial in nature. Patients with acute hypocalcemia may present with numbness of the distal extremities, circumoral paresthesia, and/or carpopedal spasm, laryngospasm, seizure and arrhythmias. In most cases, post-thyroidectomy hypocalcemia is temporary, but small percentage (0-12%) are permanent. The present study was a 1-year prospective interventional study conducted at tertiary care center, Jaipur, India. Total 42 patients who underwent thyroidectomy were included in study. Evaluation of Serum and Ionic Calcium Level done Preoperatively and Postoperative at 6, 12, 24 and 48 h and patients who develops hypocalcemia symptoms were recorded and data were analyzed. In our study hypocalcemia was seen in 13 (31%) out of 42 subjects. Ionic calcium in 'All patients' gradually decreased from pre operative 1.28 ± 0.04 mmol/l to 1.14 ± 0.08 mmol/l by 24 h. Highest incidence of hypocalcemia was seen in patients who had Total thyroidectomy + neck dissection (83.3%) compared to other type of thyroid surgery. we concluded that post thyroidectomy transient hypocalcemia is a frequent complication. Serial monitoring of calcium levels preoperatively and postoperatively combined with careful monitoring of signs and symptoms of hypocalcemia is an efficient and cost-effective tool to detect early post thyroidectomy hypocalcemia.
{"title":"Serial Estimation of Serum Calcium and Ionic Calcium Level for Early Detection of Hypocalcemia After Total/Completion Thyroidectomy.","authors":"Nishi Sonkhya, Shubham Agarwal, Mahaveer Prasad Choudhary, Nishant Gupta","doi":"10.1007/s12070-023-04031-6","DOIUrl":"10.1007/s12070-023-04031-6","url":null,"abstract":"<p><p>Hypocalcemia is an important and common complication following thyroid surgery. The development of postoperative hypocalcemia is likely to be multifactorial in nature. Patients with acute hypocalcemia may present with numbness of the distal extremities, circumoral paresthesia, and/or carpopedal spasm, laryngospasm, seizure and arrhythmias. In most cases, post-thyroidectomy hypocalcemia is temporary, but small percentage (0-12%) are permanent. The present study was a 1-year prospective interventional study conducted at tertiary care center, Jaipur, India. Total 42 patients who underwent thyroidectomy were included in study. Evaluation of Serum and Ionic Calcium Level done Preoperatively and Postoperative at 6, 12, 24 and 48 h and patients who develops hypocalcemia symptoms were recorded and data were analyzed. In our study hypocalcemia was seen in 13 (31%) out of 42 subjects. Ionic calcium in 'All patients' gradually decreased from pre operative 1.28 ± 0.04 mmol/l to 1.14 ± 0.08 mmol/l by 24 h. Highest incidence of hypocalcemia was seen in patients who had Total thyroidectomy + neck dissection (83.3%) compared to other type of thyroid surgery. we concluded that post thyroidectomy transient hypocalcemia is a frequent complication. Serial monitoring of calcium levels preoperatively and postoperatively combined with careful monitoring of signs and symptoms of hypocalcemia is an efficient and cost-effective tool to detect early post thyroidectomy hypocalcemia.</p>","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"32 1","pages":"3493-3496"},"PeriodicalIF":0.6,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10645760/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82178127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-08DOI: 10.1088/1572-9494/acf7b7
Shengqiang Li, Jing Lin, Nannan Zhang, Xue Chen
Strong-field-seeking states are the lowest-energy configurations for paramagnetic molecules in the magnetic field. Molecules in strong-field-seeking states cannot be trapped in a magnetostatic field because a magnetostatic maximum in free space is not allowed. In this paper, we propose an AC magnetic trap composed of two pairs of Helmholtz coils. The spatial magnetic field distribution is numerically calculated and the time-sequential control is depicted. We investigate the influence of the switching frequency and the electric current in the coils on the performance of our trap. Variations of the location and phase-space distribution during a whole switching cycle are simulated. Finally, we study the impact of time during which the field is switched off on the number of captured molecules in a switching cycle.
{"title":"AC magnetic trap for cold paramagnetic molecules","authors":"Shengqiang Li, Jing Lin, Nannan Zhang, Xue Chen","doi":"10.1088/1572-9494/acf7b7","DOIUrl":"https://doi.org/10.1088/1572-9494/acf7b7","url":null,"abstract":"Strong-field-seeking states are the lowest-energy configurations for paramagnetic molecules in the magnetic field. Molecules in strong-field-seeking states cannot be trapped in a magnetostatic field because a magnetostatic maximum in free space is not allowed. In this paper, we propose an AC magnetic trap composed of two pairs of Helmholtz coils. The spatial magnetic field distribution is numerically calculated and the time-sequential control is depicted. We investigate the influence of the switching frequency and the electric current in the coils on the performance of our trap. Variations of the location and phase-space distribution during a whole switching cycle are simulated. Finally, we study the impact of time during which the field is switched off on the number of captured molecules in a switching cycle.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42802586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-29DOI: 10.1088/1572-9494/acf48d
M. T. Hoang
In a previous work (2018, Commun. Theor. Phys. 70, 795–802), a new compartment model for the spreading of rumors was introduced and analyzed. However, only the local asymptotic stability of this model was discussed. In the present work, we first provide a rigorous mathematical analysis for the global asymptotic stability (GAS) of the above-mentioned rumor spreading model. By constructing suitable Lyapunov candidate functions, we obtain the GAS of a rumor-free (boundary) equilibrium point and a unique rumor-spreading (positive) equilibrium point. After that, we utilize the approach based on the Lyapunov candidate functions to study the GAS of another rumor spreading model with control strategies, which was proposed in (2022, Physica A 606, 128157). As an important consequence, the GAS of the rumor spreading model with control strategies is determined fully without resorting to technical hypotheses used in the benchmark work. Lastly, the theoretical findings are supported by a set of illustrative numerical examples. The obtained results not only improve the ones constructed in the two above-mentioned benchmark papers but also can be extended to study the global dynamics of other rumor propagation models in the context of both integer-order and fractional-order derivatives.
在之前的一项工作（2018，Commun.Theor.Phys.70795-802）中，引入并分析了一种新的谣言传播隔间模型。然而，只讨论了该模型的局部渐近稳定性。在本工作中，我们首先对上述谣言传播模型的全局渐近稳定性（GAS）进行了严格的数学分析。通过构造合适的李雅普诺夫候选函数，我们得到了无谣言（边界）平衡点和唯一谣言传播（正）平衡点的GAS。之后，我们利用基于李雅普诺夫候选函数的方法来研究另一个具有控制策略的谣言传播模型的GAS，该模型在（2022，Physica A 606128157）中提出。作为一个重要的结果，具有控制策略的谣言传播模型的GAS是在不求助于基准工作中使用的技术假设的情况下完全确定的。最后，通过一组说明性的数值例子支持了理论发现。所获得的结果不仅改进了上述两篇基准论文中构建的结果，而且可以扩展到研究其他谣言传播模型在整数阶和分数阶导数背景下的全局动力学。
{"title":"Lyapunov functions for studying global asymptotic stability of two rumor spreading models","authors":"M. T. Hoang","doi":"10.1088/1572-9494/acf48d","DOIUrl":"https://doi.org/10.1088/1572-9494/acf48d","url":null,"abstract":"In a previous work (2018, Commun. Theor. Phys. 70, 795–802), a new compartment model for the spreading of rumors was introduced and analyzed. However, only the local asymptotic stability of this model was discussed. In the present work, we first provide a rigorous mathematical analysis for the global asymptotic stability (GAS) of the above-mentioned rumor spreading model. By constructing suitable Lyapunov candidate functions, we obtain the GAS of a rumor-free (boundary) equilibrium point and a unique rumor-spreading (positive) equilibrium point. After that, we utilize the approach based on the Lyapunov candidate functions to study the GAS of another rumor spreading model with control strategies, which was proposed in (2022, Physica A 606, 128157). As an important consequence, the GAS of the rumor spreading model with control strategies is determined fully without resorting to technical hypotheses used in the benchmark work. Lastly, the theoretical findings are supported by a set of illustrative numerical examples. The obtained results not only improve the ones constructed in the two above-mentioned benchmark papers but also can be extended to study the global dynamics of other rumor propagation models in the context of both integer-order and fractional-order derivatives.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46748326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-24DOI: 10.1088/1572-9494/acf36e
Yun-Feng Wei, Songbai Chen, Jiliang Jing
We have studied the equipotential surfaces of a thick accretion disk around a Casadio–Fabbri–Mazzacurati compact object in the brane-world scenario, which possesses a mass parameter together with a parameterized post-Newtonian (PPN) parameter. With the increase in the PPN parameter, the size of the thick accretion disk decreases, but the corresponding Roche lobe size increases. Thus, the larger PPN parameter yields the larger region of existing bound disk structures, where the fluid is not accreted into the central wormhole. Moreover, with the increase in the PPN parameter, the position of the Roche lobe gradually moves away from the central compact object, and the thickness of the region enclosed by the Roche lobe decreases near the compact object but increases in the region far from the compact object. Our results also show that the pressure gradient in the disk decreases with the PPN parameter. These effects of the PPN parameter on the thick accretion disk could help one to further understand compact objects in the brane-world scenario.
{"title":"Thick accretion disk configurations around a compact object in the brane-world scenario","authors":"Yun-Feng Wei, Songbai Chen, Jiliang Jing","doi":"10.1088/1572-9494/acf36e","DOIUrl":"https://doi.org/10.1088/1572-9494/acf36e","url":null,"abstract":"We have studied the equipotential surfaces of a thick accretion disk around a Casadio–Fabbri–Mazzacurati compact object in the brane-world scenario, which possesses a mass parameter together with a parameterized post-Newtonian (PPN) parameter. With the increase in the PPN parameter, the size of the thick accretion disk decreases, but the corresponding Roche lobe size increases. Thus, the larger PPN parameter yields the larger region of existing bound disk structures, where the fluid is not accreted into the central wormhole. Moreover, with the increase in the PPN parameter, the position of the Roche lobe gradually moves away from the central compact object, and the thickness of the region enclosed by the Roche lobe decreases near the compact object but increases in the region far from the compact object. Our results also show that the pressure gradient in the disk decreases with the PPN parameter. These effects of the PPN parameter on the thick accretion disk could help one to further understand compact objects in the brane-world scenario.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44532172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-23DOI: 10.1088/1572-9494/acf2f5
Wen-Ding Du, D. Kong, Sen-uye Lou
By using a reconstruction procedure of conservation laws of different models, the deformation algorithm proposed by Lou, Hao and Jia has been used to a new application such that a decoupled system becomes a coupled one. Using the new application to some decoupled systems such as the decoupled dispersionless Korteweg–de Vries (KdV) systems related to dispersionless waves, the decoupled KdV systems related to dispersion waves, the decoupled KdV and Burgers systems related to the linear dispersion and diffusion effects, and the decoupled KdV and Harry–Dym (HD) systems related to the linear and nonlinear dispersion effects, we have obtained various new types of higher dimensional integrable coupled systems. The new models can be used to describe the interactions among different nonlinear waves and/or different effects including the dispersionless waves (dispersionless KdV waves), the linear dispersion waves (KdV waves), the nonlinear dispersion waves (HD waves) and the diffusion effect. The method can be applied to couple all different separated integrable models.
{"title":"From decoupled integrable models to coupled ones via a deformation algorithm","authors":"Wen-Ding Du, D. Kong, Sen-uye Lou","doi":"10.1088/1572-9494/acf2f5","DOIUrl":"https://doi.org/10.1088/1572-9494/acf2f5","url":null,"abstract":"By using a reconstruction procedure of conservation laws of different models, the deformation algorithm proposed by Lou, Hao and Jia has been used to a new application such that a decoupled system becomes a coupled one. Using the new application to some decoupled systems such as the decoupled dispersionless Korteweg–de Vries (KdV) systems related to dispersionless waves, the decoupled KdV systems related to dispersion waves, the decoupled KdV and Burgers systems related to the linear dispersion and diffusion effects, and the decoupled KdV and Harry–Dym (HD) systems related to the linear and nonlinear dispersion effects, we have obtained various new types of higher dimensional integrable coupled systems. The new models can be used to describe the interactions among different nonlinear waves and/or different effects including the dispersionless waves (dispersionless KdV waves), the linear dispersion waves (KdV waves), the nonlinear dispersion waves (HD waves) and the diffusion effect. The method can be applied to couple all different separated integrable models.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48893376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-23DOI: 10.1088/1572-9494/acf307
A. M. Ali, S. Sriram, Hayder Natiq, Atefeh Ahmadi, K. Rajagopal, S. Jafari
Chaotic behavior can be observed in continuous and discrete-time systems. This behavior can appear in one-dimensional nonlinear maps; however, having at least three state variables in flows is necessary. Due to the lower mathematical complexity and computational cost of maps, lots of research has been conducted based on them. This paper aims to present a novel one-dimensional trigonometric chaotic map that is multi-stable and can act attractively. The proposed chaotic map is first analyzed using a single sinusoidal function; then, its abilities are expanded to a map with a combination of two sinusoidal functions. The stability conditions of both maps are investigated, and their different behaviors are validated through time series, state space, and cobweb diagrams. Eventually, the influence of parameter variations on the maps’ outputs is examined by one-dimensional and two-dimensional bifurcation diagrams and Lyapunov exponent spectra. Besides, the diversity of outputs with varying initial conditions reveals this map’s multi-stability. The newly designed chaotic map can be employed in encryption applications.
{"title":"A novel multi-stable sinusoidal chaotic map with spectacular behaviors","authors":"A. M. Ali, S. Sriram, Hayder Natiq, Atefeh Ahmadi, K. Rajagopal, S. Jafari","doi":"10.1088/1572-9494/acf307","DOIUrl":"https://doi.org/10.1088/1572-9494/acf307","url":null,"abstract":"Chaotic behavior can be observed in continuous and discrete-time systems. This behavior can appear in one-dimensional nonlinear maps; however, having at least three state variables in flows is necessary. Due to the lower mathematical complexity and computational cost of maps, lots of research has been conducted based on them. This paper aims to present a novel one-dimensional trigonometric chaotic map that is multi-stable and can act attractively. The proposed chaotic map is first analyzed using a single sinusoidal function; then, its abilities are expanded to a map with a combination of two sinusoidal functions. The stability conditions of both maps are investigated, and their different behaviors are validated through time series, state space, and cobweb diagrams. Eventually, the influence of parameter variations on the maps’ outputs is examined by one-dimensional and two-dimensional bifurcation diagrams and Lyapunov exponent spectra. Besides, the diversity of outputs with varying initial conditions reveals this map’s multi-stability. The newly designed chaotic map can be employed in encryption applications.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43572877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-22DOI: 10.1088/1572-9494/acf27c
Shuang Wang, Miao Li
We review the theoretical aspects of holographic dark energy (HDE) in this paper. Making use of the holographic principle (HP) and the dimensional analysis, we derive the core formula of the original HDE (OHDE) model, in which the future event horizon is chosen as the characteristic length scale. Then, we describe the basic properties and the corresponding theoretical studies of the OHDE model, as well as the effect of adding dark sector interaction in the OHDE model. Moreover, we introduce all four types of HDE models that originate from HP, including (1) HDE models with the other characteristic length scale; (2) HDE models with extended Hubble scale; (3) HDE models with dark sector interaction; (4) HDE models with modified black hole entropy. Finally, we introduce the well-known Hubble tension problem, as well as the attempts to alleviate this problem under the framework of HDE. From the perspective of theory, the core formula of HDE is obtained by combining the HP and the dimensional analysis, instead of adding a DE term into the Lagrangian. Therefore, HDE remarkably differs from any other theory of DE. From the perspective of observation, HDE can fit various astronomical data well and has the potential to alleviate the Hubble tension problem. These features make HDE a very competitive dark energy scenario.
{"title":"Theoretical aspects of holographic dark energy","authors":"Shuang Wang, Miao Li","doi":"10.1088/1572-9494/acf27c","DOIUrl":"https://doi.org/10.1088/1572-9494/acf27c","url":null,"abstract":"We review the theoretical aspects of holographic dark energy (HDE) in this paper. Making use of the holographic principle (HP) and the dimensional analysis, we derive the core formula of the original HDE (OHDE) model, in which the future event horizon is chosen as the characteristic length scale. Then, we describe the basic properties and the corresponding theoretical studies of the OHDE model, as well as the effect of adding dark sector interaction in the OHDE model. Moreover, we introduce all four types of HDE models that originate from HP, including (1) HDE models with the other characteristic length scale; (2) HDE models with extended Hubble scale; (3) HDE models with dark sector interaction; (4) HDE models with modified black hole entropy. Finally, we introduce the well-known Hubble tension problem, as well as the attempts to alleviate this problem under the framework of HDE. From the perspective of theory, the core formula of HDE is obtained by combining the HP and the dimensional analysis, instead of adding a DE term into the Lagrangian. Therefore, HDE remarkably differs from any other theory of DE. From the perspective of observation, HDE can fit various astronomical data well and has the potential to alleviate the Hubble tension problem. These features make HDE a very competitive dark energy scenario.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45073560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-22DOI: 10.1088/1572-9494/acf27e
Da Zhang, Zhihong Ren
Recently, partially degenerate triple-photon states (TPS) generated by the third-order spontaneous parametric down-conversion have been observed in a superconducting cavity (2020, Phys. Rev. X 10, 011011). Their non-Gaussian entanglement properties, characterized by a series of high-order covariance matrices, have also been theoretically revealed. Here, we use the non-Gaussian entanglement criterion proposed in (2021, Phy. Rev. Lett. 127, 150502) and the logarithmic negativity to study the effect of pump brightness, self-Kerr and cross-Kerr interactions on the entanglement of partially degenerate TPS (PDTPS). We find that the brighter the pump, the easier the entanglement of PDTPS leap to higher-order covariance matrices. Although both self-Kerr and cross-Kerr interactions induce nonlinear phase shifts and weaken the entanglement of PDTPS, cross-Kerr interactions can effectively raise the threshold of entanglement loaded on the third-order covariance matrix. These results can contribute to our understanding of the mechanism of the generation of unconditional non-Gaussian entanglement.
{"title":"Influence of pump brightness, self-Kerr and cross-Kerr effects on the entanglement of partially degenerate triple-photon state","authors":"Da Zhang, Zhihong Ren","doi":"10.1088/1572-9494/acf27e","DOIUrl":"https://doi.org/10.1088/1572-9494/acf27e","url":null,"abstract":"Recently, partially degenerate triple-photon states (TPS) generated by the third-order spontaneous parametric down-conversion have been observed in a superconducting cavity (2020, Phys. Rev. X 10, 011011). Their non-Gaussian entanglement properties, characterized by a series of high-order covariance matrices, have also been theoretically revealed. Here, we use the non-Gaussian entanglement criterion proposed in (2021, Phy. Rev. Lett. 127, 150502) and the logarithmic negativity to study the effect of pump brightness, self-Kerr and cross-Kerr interactions on the entanglement of partially degenerate TPS (PDTPS). We find that the brighter the pump, the easier the entanglement of PDTPS leap to higher-order covariance matrices. Although both self-Kerr and cross-Kerr interactions induce nonlinear phase shifts and weaken the entanglement of PDTPS, cross-Kerr interactions can effectively raise the threshold of entanglement loaded on the third-order covariance matrix. These results can contribute to our understanding of the mechanism of the generation of unconditional non-Gaussian entanglement.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46070801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-22DOI: 10.1088/1572-9494/acf288
Wei-Ping Zhang, Zhong-Zheng Li, W. Duan
The present study shows that the Rayleigh–Taylor (RT) instability and its growth rate are strongly dependent on the charge-mass ratio of charged particles in a charged fluid. A higher charge-mass ratio of the charged fluid appears to result in a stronger effect of the magnetic field to suppress the RT instability. We study the RT instabilities for both dusty plasma (small charge-mass ratio of charged particles) and ion-electron plasma (large charge-mass ratio of charged particles). It is found that the impact of the external magnetic field to suppress the RT instability for ion-electron plasma is much greater than that for dusty plasma. It is also shown that, for a dusty plasma, in addition to region parameters such as the external magnetic field, region length, its gradient, as well as dust particle parameters such as number density, mass, and charge of dust particles, the growth rate of the RT instability in a dusty plasma also depends on parameters of both electrons and ions such as the number densities and temperatures of both electrons and ions.
{"title":"Investigation of the Rayleigh–Taylor instability in charged fluids","authors":"Wei-Ping Zhang, Zhong-Zheng Li, W. Duan","doi":"10.1088/1572-9494/acf288","DOIUrl":"https://doi.org/10.1088/1572-9494/acf288","url":null,"abstract":"The present study shows that the Rayleigh–Taylor (RT) instability and its growth rate are strongly dependent on the charge-mass ratio of charged particles in a charged fluid. A higher charge-mass ratio of the charged fluid appears to result in a stronger effect of the magnetic field to suppress the RT instability. We study the RT instabilities for both dusty plasma (small charge-mass ratio of charged particles) and ion-electron plasma (large charge-mass ratio of charged particles). It is found that the impact of the external magnetic field to suppress the RT instability for ion-electron plasma is much greater than that for dusty plasma. It is also shown that, for a dusty plasma, in addition to region parameters such as the external magnetic field, region length, its gradient, as well as dust particle parameters such as number density, mass, and charge of dust particles, the growth rate of the RT instability in a dusty plasma also depends on parameters of both electrons and ions such as the number densities and temperatures of both electrons and ions.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45615055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-22DOI: 10.1088/1572-9494/acf286
Li Gong, Songya Ma, Junli Jiang
Multi-party quantum communication has gradually attracted widespread attention. To realize the perfect transmission of quantum states among multiple participants, a novel multi-party controlled cyclic remote preparation protocol for arbitrary single-qubit states with three senders is proposed. With the permission of one controller, each sender can transmit an arbitrary single-qubit state to its neighbor. In addition, we give a universal protocol for multi-party controlled cyclic remote preparation of arbitrary single-qubit states in the case of multiple senders, which can realize deterministic cyclic preparation of multiple quantum states in one direction. The scheme shows that the communication task can be successfully achieved only if all senders cooperate with the controller, and there is no need for the senders to employ information splitting and additional operations before performing measurements. Finally, we discuss the cyclic remote preparation protocol with three senders under five types of noisy environment, and the closeness between the output state and original state is measured by calculating fidelity.
{"title":"Controlled cyclic remote preparation","authors":"Li Gong, Songya Ma, Junli Jiang","doi":"10.1088/1572-9494/acf286","DOIUrl":"https://doi.org/10.1088/1572-9494/acf286","url":null,"abstract":"Multi-party quantum communication has gradually attracted widespread attention. To realize the perfect transmission of quantum states among multiple participants, a novel multi-party controlled cyclic remote preparation protocol for arbitrary single-qubit states with three senders is proposed. With the permission of one controller, each sender can transmit an arbitrary single-qubit state to its neighbor. In addition, we give a universal protocol for multi-party controlled cyclic remote preparation of arbitrary single-qubit states in the case of multiple senders, which can realize deterministic cyclic preparation of multiple quantum states in one direction. The scheme shows that the communication task can be successfully achieved only if all senders cooperate with the controller, and there is no need for the senders to employ information splitting and additional operations before performing measurements. Finally, we discuss the cyclic remote preparation protocol with three senders under five types of noisy environment, and the closeness between the output state and original state is measured by calculating fidelity.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":" ","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43653986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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