Artículos de revistas: "MGQSM"

1

Ma, Xiaolu, Dajun Liu, Yaochuan Wang, Hongming Yin, Haiyang Zhong y Guiqiu Wang. "Propagation of Rectangular Multi-Gaussian Schell-Model Array Beams through Free Space and Non-Kolmogorov Turbulence". Applied Sciences 10, n.º 2 (8 de enero de 2020): 450. http://dx.doi.org/10.3390/app10020450.

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In this paper, rectangular multi-Gaussian Schell-model (MGSM) array beams, which consists N×D beams in rectangular symmetry, are first introduced. The analytical expressions of MGSM array beams propagating through free space and non-Kolmogorov turbulence are derived. The propagation properties, such as normalized average intensity and effective beam sizes of MGSM array beams are investigated and analyzed. It is found that the propagation properties of MGSM array beams depend on the parameters of the MGSM source and turbulence. It can also be seen that the beam size of Gaussian beams translated by MGSM array beams will become larger as the total number of terms, M, increases or coherence length, σ , decreases, and the beam in stronger non-Kolmogorov turbulence (larger α and l 0 , or smaller L 0 ) will also have a larger beam size.

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2

Yin, Tian, Zheng Ma, Hongcan Chen, Qun Luo, Jieyu Zhang y Guangxin Wu. "Phase Equilibria of the Mg-Zn-Sm System in Mg-Rich Corner at 320 °C and 400 °C". Metals 12, n.º 10 (20 de septiembre de 2022): 1553. http://dx.doi.org/10.3390/met12101553.

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To clarify the controversy regarding the phase equilibria in the Mg-rich corner of the Mg-Zn-Sm system, alloys annealed at 320 °C and 400 °C were employed to determine the phase constitution, composition and crystal structure by scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The maximum solubility of Zn in Mg3Sm was measured to be 49.2 at.% at 400 °C. The Y phase (Mg62Zn31Sm7), only observed in the as-cast alloys, was determined to have an orthorhombic structure with lattice parameters of a = 10.20 Å, b = 11.26 Å and c = 9.64 Å by TEM. The hexagonal compound μ7, identified with lattice parameters of a = 34.62 Å and c = 8.94 Å, was detected during the transformation of the Y phase to the Z phase in the alloys located in the (Mg) + Mg3Sm + Z three-phase region. The phase equilibria (Mg) + Mg41Sm5 + Mg3Sm, Mg + Mg3Sm + Z, (Mg) + Z + liquid and Mg2Zn3 + Z + liquid at 400 °C are confirmed, and the three-phase region (Mg) + Z + MgZn exists in the Mg-Zn side at 320 °C. Subsequently, a self-consistent thermodynamic description was obtained based on the experimental data. Meanwhile, solidification simulation of Y phase formation was conducted by suppressing the stale Z phase, which can reasonably explain the as-cast microstructure of alloys in the Mg-rich corner. The thermodynamic database would be helpful for the further development of Mg-Zn-Sm alloys.

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3

Zhu, Hui, Yingfang Xue, Xiaofeng Chen, Qiang Li y Hui Li. "V-MGSM: A Multilevel and Grouping Security Virtualization Model for Mobile Internet Service". Mobile Information Systems 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/841292.

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With the pervasiveness of smart phones and the advance of Mobile Internet, more and more Mobile Internet services migrated to the cloud service platform for better user experience. As one of the most indispensable components of the cloud computing infrastructure, virtualization technology has attracted considerable interest recently. However, the flourish of virtualization still faces many challenges in information security. In this paper, we propose a novel architecture, called multilevel and grouping security model for virtualization (V-MGSM), for the security of resources in cloud computing platform. Specifically, to fulfill the balance between information sharing and privacy preservation, the virtual machines (VMs) are divided into diverse groups based on their corresponding entities, and each VM in the same group is assigned to different security level according to security requirements. Besides, the operation between VMs is based on mandatory access control mechanism. Detailed security analysis shows that the proposed V-MGSM can provide a secure communication mechanism for VMs and implement the synchronous updates of the borrowed data. Ultimately, we implement V-MGSM in Xen for experiments, and the results demonstrate that V-MGSM can indeed achieve data security and privacy protection efficiently for Mobile Internet service.

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4

Neumann, Ruth y James Guthrie. "Quality Enhancement in Doctoral Education: Developing a More Public Process". Journal of Management & Organization 7, n.º 1 (2001): 13–24. http://dx.doi.org/10.1017/s1833367200005277.

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AbstractGovernments play an important role in providing an appropriate national framework and structure for the development of doctoral education. Nevertheless, ultimate responsibility for quality supervision processes lies with institutions, in particular with their departmental units and their policies and processes (DETYA, 1999c). This paper presents a case study of recent developments in the quality enhancement of doctoral supervision in the Macquarie Graduate School of Management (MGSM). In doing so it looks at three areas in particular: (1) the key role of infrastructure support, including the introduction of a code of practice in doctoral supervision; (2) the induction and acculturation processes; and (3) supervision quality, including the selection, development and training of supervisors. The aim of the developments is to make a recognized private process more public and transparent. MGSM currently enrolls a significant number of doctoral students and the enhancement of their doctoral experience is a key priority. The paper concludes by highlighting key issues for future development.

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5

Neumann, Ruth y James Guthrie. "Quality Enhancement in Doctoral Education: Developing a More Public Process". Journal of the Australian and New Zealand Academy of Management 7, n.º 1 (2001): 13–24. http://dx.doi.org/10.5172/jmo.2001.7.1.13.

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AbstractGovernments play an important role in providing an appropriate national framework and structure for the development of doctoral education. Nevertheless, ultimate responsibility for quality supervision processes lies with institutions, in particular with their departmental units and their policies and processes (DETYA, 1999c). This paper presents a case study of recent developments in the quality enhancement of doctoral supervision in the Macquarie Graduate School of Management (MGSM). In doing so it looks at three areas in particular: (1) the key role of infrastructure support, including the introduction of a code of practice in doctoral supervision; (2) the induction and acculturation processes; and (3) supervision quality, including the selection, development and training of supervisors. The aim of the developments is to make a recognized private process more public and transparent. MGSM currently enrolls a significant number of doctoral students and the enhancement of their doctoral experience is a key priority. The paper concludes by highlighting key issues for future development.

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6

Zhang, Guiyong, Da Hui, Da Li, Li Zou, Shengchao Jiang y Zhi Zong. "A New TVD Scheme for Gradient Smoothing Method Using Unstructured Grids". International Journal of Computational Methods 17, n.º 03 (20 de noviembre de 2019): 1850132. http://dx.doi.org/10.1142/s0219876218501323.

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An improved [Formula: see text]-factor algorithm for implementing total variation diminishing (TVD) scheme has been proposed for the gradient smoothing method (GSM) using unstructured meshes. Different from the methods using structured meshes, for the methods using unstructured meshes, generally the upwind point cannot be clearly defined. In the present algorithm, the value of upwind point has been successfully approximated for unstructured meshes by using the GSM with different gradient smoothing schemes, including node GSM (nGSM) midpoint GSM (mGSM) and centroid GSM (cGSM). The present method has been used to solve hyperbolic partial differential equation discontinuous problems, where three classical flux limiters (Superbee, Van leer and Minmod) were used. Numerical results indicate that the proposed algorithm based on mGSM and cGSM schemes can avoid the numerical oscillation and reduce the numerical diffusion effectively. Generally the scheme based on cGSM leads to the best performance among the three proposed schemes in terms of accuracy and monotonicity.

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7

Meng, Fanxiang, Zhimin Sun, Long Yang, Kui Yu y Zongliang Wang. "Assessing the Forecasting Accuracy of a Modified Grey Self-Memory Precipitation Model Considering Scale Effects". Water 14, n.º 10 (21 de mayo de 2022): 1647. http://dx.doi.org/10.3390/w14101647.

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Precipitation is an important parameter in water resource management, urban flood warning systems, and hydrological analyses. Precipitation forecasting can provide a decision-making basis for relevant organizations, such as those in the agricultural sector and water conservancy departments. In this paper, a modified grey self-memory model (MGSM) was constructed by combining a self-memory function and grey theory. To verify the precision of the model in cases in which measured data are not available in the forecasting stage, a self-test method based on the scale effect in the precipitation forecasting stage was proposed. Ultimately, the model was verified based on three precipitation scales—the annual scale, the crop growth period, and the monthly scale—in the crop growth period from 1961 to 2018 in the Songnen Plain area, Heilongjiang Province. The results showed that the MGSM yielded higher fitting accuracy than the original GM(1,1) and grey self-memory models. Furthermore, the precipitation in the study area was predicted with the MSGM at the three different scales above from 2019 to 2023. The accuracy of forecasting meets the relevant requirements, and the model can be used to forecast precipitation trends at different time scales in the future. The results provide a reference for formulating scientific and rational agricultural water use strategies and guiding agricultural production practices.

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8

Zhang, Xian, Zhen Wu, Wei Liu y Zi-sheng Chao. "Preparation of pyridine and 3-picoline from acrolein and ammonia with HF/MgZSM-5 catalyst". Catalysis Communications 80 (mayo de 2016): 10–14. http://dx.doi.org/10.1016/j.catcom.2016.02.011.

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9

Ciambelli, Paolo y Pasquale Corbo. "Selective formation of propylene by acid-base catalyzed conversion of methyl alcohol over MgZSM-5". Reaction Kinetics and Catalysis Letters 37, n.º 2 (septiembre de 1988): 391–95. http://dx.doi.org/10.1007/bf02062089.

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10

Zhang, Minghui, Xianlong Liu, Lina Guo, Lin Liu y Yangjian Cai. "Partially Coherent Flat-Topped Beam Generated by an Axicon". Applied Sciences 9, n.º 7 (11 de abril de 2019): 1499. http://dx.doi.org/10.3390/app9071499.

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The intensity distribution of a partially coherent beam with a nonconventional correlation function, named the multi-Gaussian Schell-model (MGSM) beam, focused by an axicon was investigated in detail. Our numerical results showed that an optical needle with a flat-topped spatial profile and long focal depth was formed and that we can modulate the focal shift and focal depth of the optical needle by varying the width of the degree of coherence (DOC) and the parameters of the correlation function. The adjustable optical needle can be applied for electron acceleration, particle trapping, fiber coupling and percussion drilling.

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11

Tao, Lingbing, Jian Huang, YingKun Song y Zhixin Tie. "Encrypted Cloud Data Mark and Group Search Method Based on Singular Value Decomposition". Mathematical Problems in Engineering 2022 (22 de abril de 2022): 1–10. http://dx.doi.org/10.1155/2022/5279284.

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In order to improve the retrieval efficiency and security of the cloud server, an encrypted cloud data mark and group search method (MGSM) based on singular value decomposition is proposed in this paper. Firstly, all documents are clustered, then indexes and query marks are constructed according to classes, and then documents with low correlation are filtered according to their matching degree. Secondly, the reserved document index vector is expressed as an index matrix, and the singular value decomposition (SVD) algorithm is employed to reduce the dimensionality of the matrix. Then, the corresponding threshold is set to improve the search efficiency while ensuring accuracy. Thirdly, the reduced-dimensional indexes are grouped to reduce the high-dimensional encryption key to multiple low-dimensional keys, further reducing the index encryption time. Theoretical analysis and experimental results show that the proposed method is more feasible and more effective than the compared schemes.

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12

Tao, Liang y Xiao-Long Deng. "Simulating the Linearly Elastic Solid–Solid Interaction with a Cut Cell Method". International Journal of Computational Methods 14, n.º 06 (agosto de 2017): 1750072. http://dx.doi.org/10.1142/s0219876217500724.

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In this work, a cut cell-based sharp interface method is developed to deal with the interaction between linearly elastic solids in Eulerian framework. The material interface is represented by cut faces, and evolved by level set equation. Finite volume scheme is applied and strong coupling is achieved by using the Riemann solver for linearly elastic solid–solid interaction on the material interface. Original Ghost Solid Method (OGSM) and Modified Ghost Solid Method (MGSM) are realized in the Eulerian framework for comparison. Simulation results show that OGSM can lead to severe nonphysical oscillations when the density ratio is high, which is same as the results in KK. The location of wave front calculated by Ghost Solid Methods (GSMs) deviates from the exact location, because the evaluation of the ghost points deviates from the real interface location. The developed cut cell-based method gives accurate wave front location, and is stable for high density and acoustic impedance ratio and high-order reconstruction.

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13

Takaba, Hiromitsu, Takato Suzuki y Shin-ichi Nakao. "Estimation of diffusion coefficient and permeance of aromatic molecules in silicalite and MgZSM-5 using quantum calculation and dynamic Monte Carlo simulation". Fluid Phase Equilibria 219, n.º 1 (mayo de 2004): 11–18. http://dx.doi.org/10.1016/j.fluid.2004.01.022.

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14

Vershinina, Sofia F. y Vladimir I. Evtushenko. "Effect of intratumoral implantation of barium hexaferrite, magnetite, hematite, aluminium oxide and silica on the dynamics of Erlich tumor growth and survival value of tumor-carrying mice". Medical academic journal 20, n.º 1 (22 de junio de 2020): 75–82. http://dx.doi.org/10.17816/maj34107.

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Introduction. We have earlier shown antitumoral effect of barium hexaferrite implant BHF for models of two intratumoral transplantable solid tumor of mice LIO-1 and Erlich (2 sm3 tumors). In the mentioned work on the model of a rather big sized solid Erlich tumor (3 sm3) we have studied a comparative antitumoral effect after the implantation of BHF particles with a residual magnetic field of 150 mGsm referring to particles of iron oxides with residual magnetic field that was nearing to the zerohematite (Fe2O3) and magne tite (Fe3O4), and as well as for the control aluminium oxide (Al2O3) and silica (nSiO2 ∙ mH2O). Material and methods. Trials have been conducted with 70 white mice female mice with a mass of 2324 g. Malignant epithelial tumor of Erlich was intramuscularly transplanted into the right hind extremity. When tumors reached a size of 3 sm3, mice were divided into 6 groups whom BHF, magnetite, hematite, aluminium oxide, silica or physiologic saline were implanted, correspondingly. Results. As a result of the conducted studies it was found that BHF being implanted into a big-sized tumor (3 sm3) has a mild antitumoral effect for all the studies periods. Particles of iron oxides magnetite and hematite with a magnetic field nearing the zero did not possess the antitumor effect. By the end of experiment (29 days) in all groups including a control group, death of mice at 20 to 50 percent have been seen, and tumors were significantly necrotized, whereas in a group with implantation of silica into the tumor 100 percent of mice have survived and tumors itself did not have necrosis and had even pink colouring.

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15

Alkelly, Abdu Ahmed, M. A. H. Khaled y Labiba Fuad Hassan. "Spreading properties of partially coherent multi-Gaussian Schell-model and modiﬁed Bessel-correlated vortex beams in anisotropic turbulent plasma". Physica Scripta, 19 de junio de 2023. http://dx.doi.org/10.1088/1402-4896/acdf90.

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Abstract We investigate the propagation characteristics of partially coherent multi-Gaussian Schell-model (MGSM) and modiﬁed Bessel-correlated (MBc) vortex beams traveling in a turbulent plasma. Based on the extended Huygens-Fresnel principle, the cross-spectral density expressions for partially coherent MGSM and MBc vortex beams propagating through turbulent plasma were derived. The results show that the dark spot at the center of the partially coherent MGSM beams disappears in the low-coherence states and remains in the high-coherence states only. In contrast, the intensity of partially coherent MBc vortex beams exists in low- and high-coherence states and does not change during propagation in a weak turbulent plasma.

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16

Zakharia, Elia, Djoko Budiyanto Setyohadi y Y. Sigit Purnomo W. P. "PERANCANGAN ANTARMUKA ONLINE COURSE PADA PERANGKAT MOBILE MENGGUNAKAN TEORI USABILITY". Jurnal Informatika 12, n.º 1 (20 de junio de 2016). http://dx.doi.org/10.21460/inf.2016.121.468.

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E-learning model can be developed into various forms according to the context of development. All of e-learning model aims to support learning process. The main objective of this study was to design online course interface that runs in mobile device using the theory of usability ISO 9241-11 in UAJY (Universitas Atma Jaya Yogyakarta). Data was collected from 55 undergraduate students of UAJY. It is used as initial state in design process. Furthermore, online course interface design created with use case diagram that adapted to activities of HTA. Nevertheless, in the design process components of interface created by the user persona and mobile device pattern, as well as guided by MGQM, which is also adapted to the limitations of this study and the conditions in UAJY. In addition, using log data collection to handle part of MGQM, which related with time, steps, resources.

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17

Nadarzynski, Tom, Will Nutland, Phil Samba, Jake Bayley y T. Charles Witzel. "The Impact of First UK-Wide Lockdown (March–June 2020) on Sexual Behaviors in Men and Gender Diverse People Who Have Sex with Men During the COVID-19 Pandemic: A Cross-Sectional Survey". Archives of Sexual Behavior, 7 de noviembre de 2022. http://dx.doi.org/10.1007/s10508-022-02458-6.

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AbstractThe global COVID-19 pandemic resulted in strict social distancing measures restricting close physical contact. Men (cis and trans) and other gender diverse people who have sex with men (MGDSM) are at higher risk of sexually transmitted infections (STIs) and may have experienced changes in sexual behavior during government restrictions on social and sexual contact. We aimed to examine self-reported sexual behavior of MGDSM during the first UK-wide lockdown to identify the characteristics of the individuals who might most require sexual health promotion and clinical support. In April–May 2020, we conducted an online survey of MGDSM, promoted on social media and Grindr. Our exploratory approach used descriptive analysis to identify self-reported changes in sexual behavior and performed regression analyses to identify correlates of casual sex during the lockdown. A total of 1429 respondents completed the survey: mean age 36 years, 84% White, 97% male or trans male, 98% assigned male sex at birth, 2% female or non-binary, 65% degree educated or higher. During the lockdown, 76% reported not having any casual sex partners. While the majority reported reduced casual sex, 3% reported an increase in casual sex with one person and 2% with three or more people (group sex). About 12% of the sample engaged in casual sex with only one person and 5% with four or more sexual partners during the lockdown. Reporting casual sex during lockdown was associated with: lower level of education OR = 2.37 [95% CI 1.40–4.01]; identifying as a member of an ethnic minority OR = 2.27[1.40–3.53]; daily usage of sexual networking apps OR = 2.24[1.54–3.25]; being less anxious about contracting SARS-CoV-2 through sex OR = 1.66[1.12–2.44]; using PrEP before lockdown OR = 1.75[1.20–2.56]; continuing to use PrEP OR = 2.79[1.76–4.57]; and testing for STIs during lockdown OR = 2.65[1.76–3.99]. A quarter of respondents remained sexually active with casual partners, indicating a need to provide STI screening services and health promotion targeted to groups most likely to have need over this period. Future research is required to better understand how to support sexual and gender minorities to manage sexual risk in the context of pandemic public health initiatives.

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18

Lockwood, Mike, Mathew J. Owens, Stephanie L. Yardley, Iiro O. I. Virtanen, Anthony R. Yeates y Andrés Muñoz-Jaramillo. "Application of historic datasets to understanding open solar flux and the 20th-century grand solar maximum. 2. Solar observations". Frontiers in Astronomy and Space Sciences 9 (7 de septiembre de 2022). http://dx.doi.org/10.3389/fspas.2022.976444.

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We study historic observations of solar activity from the 20th-century rise towards the peak of the Modern Grand Solar Maximum (MGSM) and compare with observations of the decline that has occurred since. The major difference in available solar observations of the rise and of the fall are accurate magnetograms from solar magnetographs: we here use synthetic magnetograms to interpret the rise and employ historic observations of Polar Crown Filaments to test them and verify their use. We show that eclipse images at sunspot minimum reveal the long-term variation of open flux deduced from geomagnetic observations in Paper 1 (Lockwood et al., 2022). We also make use of polar coronal hole fluxes derived from historic white light images of polar faculae, but have to consider the implications of the fact that these facular images do not tell us the polarity of the field. Given this caveat, the agreement between the polar coronal hole fluxes and the values derived from open flux continuity modelling based on sunspot numbers is extremely good. This comparison indicates that one possible solution to the “open flux problem” is open flux within the streamer belt that potential-based modelling of coronal fields from photospheric fields is not capturing. We take a detailed look at the solar cycle at the peak of the MGSM, cycle 19, and show the variation of the polar coronal hole fluxes and the inferred poleward flux surges are predictable from the asymmetries in flux emergence in the two hemispheres with implied transequatorial flux transfer and/or “anti-Hale” (or more general “rogue” active region flux) emergence late in the sunspot cycle.

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19

"05/00456 Estimation of diffusion coefficient and permeance of aromatic molecules in silicalite and MgZSM-5 using quantum calculation and dynamic Monte Carlo simulation". Fuel and Energy Abstracts 46, n.º 1 (enero de 2005): 60. http://dx.doi.org/10.1016/s0140-6701(05)80457-6.

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20

Bondarenko, G. N., A. S. Rodionov, N. V. Kolesnichenko, T. I. Batova, E. N. Khivrich y A. L. Maximov. "Features of the Mechanism of the Dimethyl Ether to Light Olefins Conversion over MgZSM-5/Al2O3: Study by Vibrational Spectroscopy Experimental and Theoretical Methods". Catalysis Letters, 30 de septiembre de 2020. http://dx.doi.org/10.1007/s10562-020-03399-2.

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