bluuebunny/crossref_metadata_2025 huggingface dataset:
The Association of Thyroid Hormones with Coronary Atherosclerotic
Severity in Euthyroid Patients
Authors: Yu Na , Wang Linjie , Zeng Yong , Zhao Yuxing , Chen Shi , Pan Hui , Gong Fengying , Zhu Huijuan
Published: January 2022

The aim of the work was to explore the correlation between thyroid hormones and
coronary atherosclerotic severity. This cross-sectional study included 340
euthyroid patients who underwent diagnostic coronary artery angiography (CAG).
Gensini Score (GS) was applied to assess the severity of coronary
atherosclerosis. Thyroid hormones and routine biochemical parameters were
measured. The associations between thyroid hormones and coronary atherosclerosis
severity were analyzed. Thyroid hormones levels or parameters were taken as both
continuous variables and tertiles into analysis, and the lowest tertile was
usually used as the reference (OR=1) for medium and highest tertiles.
Free triiodothyronine (FT3) level was associated with GS≥22 (Median GS)
in Model I adjusted for age and sex [Continuous: OR=0.46, 95% CI
(0.23, 0.92), p=0.029; Tertile 3: OR=0.54, 95% CI (0.30,
0.97), p=0.038], and Model II adjusted for all known risk factors of
coronary artery disease (CAD) [Continuous: OR=0.44, 95% CI
(0.20, 0.95), p=0.036; Tertile 3: OR=0.49, 95% CI (0.25,
0.96), p=0.039]. Subjects with highest tertile of FT3 to free thyroxine
(FT4) ratio (FT3/FT4 ratio) appeared to have the remarkably decreased
risk of CAD in both Non-adjusted Model [OR=0.49, 95% CI (0.24,
0.98), p=0.044] and Model I [OR=0.45, 95% CI (0.22,
0.93), p=0.031]. Higher FT3 level within normal range was independently
and negatively associated with severity of coronary atherosclerosis. Besides,
FT3/FT4 ratio was remarkably correlated with the prevalence of CAD in
euthyroid population.
Colonização pré-operatória por Staphylococcus aureus e as bactérias não suscetíveis à cefalosporina, em pacientes com fratura proximal do fêmur
Authors: Bastos Leonardo R. , Almeida Mila M. , Marques Elizabeth A. , Leão Robson Souza
Published: January 2022

Objetivo Estimar a frequência da colonização por Staphylococcus aureus e as bactérias não suscetíveis à cefalosporina, em pacientes com fratura proximal do fêmur durante a internação pré-operatória.

Métodos Avaliação da prevalência e incidência em 63 pacientes hospitalizados ao longo de um ano. O tempo médio de internação pré-tratamento foi de 12 dias. As amostras foram coletadas das narinas, pele da virilha e mucosa anal, durante a internação prévia ao tratamento e testadas pela técnica de disco-difusão.

Resultados A incidência da colonização hospitalar e a prevalência de resultados positivos foram de 14,3% e 44,4% para Staphylococcus aureus; 3,2% e 6,4% para S. aureus resistente à meticilina; 28,6% e 85,7% para Staphylococcus coagulase-negativo resistente à meticilina; 28,6% e 61,9% para Enterobacteriaceae não suscetível à cefazolina (KFNSE); e 20,6% e 28,6% para Enterobacteriaceae não suscetível à cefuroxima (CXNSE). Além da duração do período de internação pré-tratamento, os pacientes não deambularam previamente à ocorrência da fratura e nem fizeram uso de antimicrobiano. Além disso, a duração do período de internação pré-tratamento cirúrgico, ser não-deambulador antes da fratura, uso de antimicrobianos, risco cirúrgico IV pela American Society of Anesthesiologists (ASA) e internação anterior, estiveram relacionados a um aumento na incidência de aquisição hospitalar e prevalência de colonização pelas cepas avaliadas. A prevalência de colonização pela KFNSE foi três vezes maior do que pela CXNSE na admissão e duas vezes maior no momento do tratamento da fratura.

Conclusão Observou-se uma alta incidência da colonização hospitalar e prevalência da colonização por todas as cepas estudadas, o que pode orientar a indicação de medidas profiláticas contra a infecção.
Charge density wave activated excitons in TiSe2–MoSe2 heterostructures
Authors: Joshi Jaydeep , Scharf Benedikt , Mazin Igor , Krylyuk Sergiy , Campbell Daniel J. , Paglione Johnpierre , Davydov Albert , Žutić Igor , Vora Patrick M.
Published: January 2022

Layered materials enable the assembly of a new class of heterostructures where lattice-matching is no longer a requirement. Interfaces in these heterostructures therefore become a fertile ground for unexplored physics as dissimilar phenomena can be coupled via proximity effects. In this article, we identify an unexpected photoluminescence (PL) peak when MoSe2 interacts with TiSe2. A series of temperature-dependent and spatially resolved PL measurements reveal that this peak is unique to the TiSe2–MoSe2 interface, is higher in energy compared to the neutral exciton, and exhibits exciton-like characteristics. The feature disappears at the TiSe2 charge density wave transition, suggesting that the density wave plays an important role in the formation of this new exciton. We present several plausible scenarios regarding the origin of this peak that individually capture some aspects of our observations but cannot fully explain this feature. These results therefore represent a fresh challenge for the theoretical community and provide a fascinating way to engineer excitons through interactions with charge density waves.
Impacts of the Lewis and Markstein numbers on premixed flame acceleration in channels due to wall friction
Authors: Bilgili Serdar , Bychkov Vitaly , Akkerman V'yacheslav
Published: January 2022

The effects of flame stretch as well as that of thermal and molecular diffusion on the scenario of flame acceleration in channels are quantified by means of computational and analytical endeavors. The analytical formulation incorporates the internal transport flame properties into the theory of flame acceleration due to wall friction by means of the Markstein number, which characterizes the flame response to curvature and stretch. Being a positive or negative quantity and a function of the thermal-chemical combustion parameters, such as the thermal expansion ratio as well as the Lewis and Zeldovich numbers, the Markstein number either moderates or promotes flame acceleration. While the Markstein number may provide a substantial impact on the flame acceleration rate in narrow channels, this effect diminishes with increase in the channel width. The analytical formulation is accompanied by extensive computational simulations of the reacting flow equations, which clarify the impact of the Lewis number on flame acceleration. It is noted that for Lewis numbers below a certain critical value, at the initial stage of flame acceleration, a globally convex flame front splits into two or more finger-like segments, accompanied by a drastic increase in the flame front surface area and associated enhancement of flame acceleration. Later, however, these segments of the flame front meet, promptly consuming cavities and pockets, which substantially decreases the flame surface area and moderates acceleration. Eventually, this dynamics results in a single, globally convex flame, which keeps accelerating. Overall, the thermal-diffusive effects substantially facilitate flame acceleration, thereby advancing a potential deflagration-to-detonation transition.
Correlation between fragility and free volume void size at glass transition temperature
Authors: Ma Qingli , Wang Yong , Gu Youlin , Zhao Nanxiang , Luo Sheng , Wang Lei , Hu Yihua , Fang Jiajie
Published: January 2022

Despite the tremendous endeavors devoted to exploiting the nature of glass transition, the factors that control the steepness index of viscosity near glass transition, that is, fragility, remain unclear. In this study, we demonstrate that, for polymeric and small molecular weight organic glass formers, fragility increases upward with increasing size of the free volume void at the glass transition temperature. This changing trend indicates that fragility is governed by the properties of the segments or molecular clusters in the free volume void rather than by the properties of the entire polymer chains. The physics behind the relationship between fragility and free volume void at the glass transition temperature is consistent with the physics behind the relationship between fragility and the molecular weight as well as the mechanics of the relationship between fragility and size of the cooperative units. This relationship also provides new insights into the understanding of the nature of the glass transition of polymeric and small molecular weight organic glass formers.
Capillary filling in drop merging: Dynamics of the four-phase contact point
Authors: Rostami Peyman , Auernhammer Günter K.
Published: January 2022

The merging of immiscible drops differs significantly from the merging of miscible drops due to the formation of a liquid–liquid interface between drops. The immiscibility requires the formation of a four-phase contact point, where the drops, the gas, and the substrate meet. We show that this point has its own unique dynamics, never studied beforehand. For very different scenarios, the propagation distance of this point follows scales with time like t12. A model balancing the driving and dissipative forces agrees with our experiments.
A review of heat pump research in China using bibliometric methods
Authors: Zhou Chaohui , Ye Shenghui , Ni Long , Yao Yang
Published: January 2022

The analysis of big data can reveal the macroscopic situation of a certain field from a relatively objective angle and indicate the potential development trends in the future. This study provides a novel approach to review the development of heat pump research from 1994 to 2020 in China using the bibliometric method which belongs to big data analysis. More than 15 000 references were selected, 2716 of which are from the Web of Science core collection and 13 183 of which are from China National Knowledge Infrastructure, including articles and reviews. Their knowledge maps and co-citation analysis were performed. Different major trends were identified for 15 clusters. Results showed that ground source heat pump (GSHP), air source heat pump (ASHP)-on frost, ASHP on heating, and solar-assisted heat pump are the most active research fronts. The studies on the GSHP account for the largest portion, reaching about 21%. Ground heat exchanger and thermal imbalance are the focus points. ASHP is the hottest research direction in recent years, mainly focusing on the technologies of frosting/defrosting and heating. The studies on defrosting experience a transition from the frosting/defrosting process and thermal energy storage for defrosting to frost-free ASHP. Besides, direct-expansion solar-assisted heat pump water heater was becoming more and more active. Finally, industrial heat pump showed great development potential.
Effect of surface roughness on laminar flow in closed channels
Authors: Ji Yue , Liu Fei , Li Xingfei , Li Jinyi
Published: January 2022

This study explores the flow characteristics of liquid water and liquid metals in closed channels with different roughness by using a modified roughness–viscosity model (RVM). The RVM model explains the influence of surface roughness on laminar flow by incorporating roughness and viscosity. This study proposes that the local Reynolds number should be used instead of the overall Reynolds number. This modified model in the flow of liquid water with different rough enclosures is studied by numerical simulation and then verified by experiments. Moreover, the verification model is used to explore the flow of conductive liquid metal in closed channels with different roughness under a magnetic field. According to the results of the study: (1) In the radial direction of the closed channel, the larger the radius was, the greater the change in the flow rate due to surface roughness. (2) As the flow direction through a closed channel changed, the larger the relative surface roughness was, the smaller the frictional resistance. (3) In a vertical magnetic field, the effect of surface roughness first weakened and then strengthened as the strength of the magnetic field increased. As the latter increased in a horizontal magnetic field, the effect of surface roughness decreased. This verified modified RVM model provides ideas and methods for research on laminar roughness in micro-closed channels in the future.
Controllable perovskite crystallization via potassium pretreatment toward high-performance solar cells
Authors: Yang Jian , Yao Ruijia , Xu Xingliang , Sun Yonggui , Du Ming , Yang Jianping , Liu Wei , Chu Liang , Li Xing'ao
Published: January 2022

High-photoelectric performance and long-term stability of perovskite solar cells (PSCs) are closely related to the crystallinity and morphology of organic–inorganic halide perovskite films. However, interfaces and grain boundary defects of perovskite films could degrade the quality of perovskite films. In this work, potassium nitrate (KNO3) was taken to pretreat the compact TiO2 layer by a simple spin-coating method, which can simultaneously passivate both the electron transport layer (ETL)/perovskite interface defects and grain boundaries defects in perovskite films. Accordingly, the crystallinity and absorption intensity of the perovskite films were improved, which also enlarged the grain size, prolonged carrier lifetimes, and reduced the defect density. Therefore, an enhancement of short-circuit current density ranges from 22.56 to 24.00 mA cm−2 and a corresponding power conversion efficiency increases from 16.74% to 19.26%. PSCs also show that improved operational stability was 40%–65% with only 20% power conversion efficiency loss after 320 h under the relative humidity. The ETL modified by KNO3 reported herein provided a new approach of defect passivation with high-performance PSCs.
QM/MM optimization with quantum coupling: Host–guest interactions in a pentacene-doped p-terphenyl crystal
Authors: Bertoni Andrés I. , Fogarty Richard M. , Sánchez Cristián G. , Horsfield Andrew P.
Published: January 2022

In this work, we present a novel force-based scheme to perform hybrid quantum mechanics/molecular mechanics (QM/MM) computations. The proposed scheme becomes especially relevant for the simulation of host–guest molecular systems, where the description of the explicit electronic interactions between a guest molecule and a classically described host is of key importance. To illustrate its advantages, we utilize the presented scheme in the geometry optimization of a technologically important host–guest molecular system: a pentacene-doped p-terphenyl crystal, a core component of a room-temperature MASER device. We show that, as opposed to the simpler and widely used hybrid scheme ONIOM, our Quantum-Coupling QM/MM scheme was able to reproduce explicit interactions in the minimum energy configuration for the host–guest complex. We also show that, as a result of these explicit interactions, the host–guest complex exhibits an oriented net electric dipole moment that is responsible for red-shifting the energy of the first singlet–singlet electronic excitation of pentacene.
Γ

-convergence of Onsager–Machlup functionals: I. With applications to maximum a posteriori estimation in Bayesian inverse problems
Authors: Ayanbayev Birzhan , Klebanov Ilja , Lie Han Cheng , Sullivan T J
Published: January 2022

The Bayesian solution to a statistical inverse problem can be summarised by a mode of the posterior distribution, i.e. a maximum a posteriori (MAP) estimator. The MAP estimator essentially coincides with the (regularised) variational solution to the inverse problem, seen as minimisation of the Onsager–Machlup (OM) functional of the posterior measure. An open problem in the stability analysis of inverse problems is to establish a relationship between the convergence properties of solutions obtained by the variational approach and by the Bayesian approach. To address this problem, we propose a general convergence theory for modes that is based on the Γ-convergence of OM functionals, and apply this theory to Bayesian inverse problems with Gaussian and edge-preserving Besov priors. Part II of this paper considers more general prior distributions.
Non-linear interaction of laser light with vacuum: contributions to the energy density and pressure in the presence of an intense magnetic field
Authors: Pérez-García M A , Pérez Martínez A , Rodríguez Querts E
Published: January 2022

Recent simulations show that very large electric and magnetic fields near the kilo tesla strength will likely be generated by ultra-intense lasers at existing facilities over distances of hundreds of microns in underdense plasmas. Even stronger ones are expected in the future although some technical difficulties must be overcome. In addition, it has been shown that vacuum exhibits a peculiar non-linear behaviour in the presence of high magnetic and electric field strengths. In this work, we are interested in the analysis of the thermodynamical contributions of vacuum to the energy density and pressure when radiation interacts with it in the presence of an external magnetic field. Using the Euler–Heisenberg formalism in the regime of weak fields i.e. smaller than critical quantum electrodynamics field strength values, we evaluate these magnitudes and analyse the highly anisotropic behaviour we find. Our work has implications for photon–photon scattering with lasers and astrophysically magnetized underdense systems far outside their surface where matter effects are increasingly negligible.
Effects of edge biasing on blob dynamics and associated transport in the edge of the J-TEXT tokamak
Authors: Li W , Xu Y , Cheng J , Liu H , Chen Z P , Xu J Q , Wang X Q , Chen Z Y , Wang N C , Yang Z J , Ding Y H , Pan Y
Published: January 2022

Effects of edge radial electric field

E
r

and

E
r

× B flow shear on edge turbulence and turbulent transport, in particular, on large-scale blobs and blobby transport have been investigated in the positive and negative biasing discharges in the J-TEXT tokamak. The results show that under certain conditions, the positive electrode biasing induces better plasma confinement than the negative biasing. Further studies reveal that in addition to flow shear effects on blob dynamics, the local radial electric field at the edge region plays a significant role in repulsion of the blobs and associated transport, leading to improvement of particle confinement when the outward motion of the blobs is blocked. The results are consistent with the existing theory on blob dynamics.
Plasma-based microwave power limitation in a printed transmission line: a self-consistent model compared with experimental data
Authors: Fuster Lucas , Hagelaar Gerjan , Pascaud Romain , Simon Antoine , Hoffmann Patrick , Liard Laurent , Pascal Olivier , Callegari Thierry
Published: January 2022

Plasma-based microwave power limitation in a suspended microstrip transmission line integrating a micro hollow cathode discharge (MHCD) in its centre is experimentally and numerically studied. Transient and steady state microwave power measurements exhibit a limitation threshold of 28 dBm and time responses of 25 microseconds. Intensified charge-coupled device imaging shows that microwave breakdown occurs at the top of the MHCD. The plasma then extends towards the microwave source within the suspended microstrip transmission line. Besides, a self-consistent model is proposed to simulate the non-linear interaction between microwave and plasma. It gives numerical results in agreement with the measurements, and show that the plasma expansion during the transient response is related to a shift between the ionization source term and the electron density maximum. The propagation speed, under the tested conditions, depends mainly on the stepwise ionization from the excited states.
LoGHeD: an effective approach for negative differential resistance effect suppression in negative-capacitance transistors
Authors: Xie Ziqiang , Lü Weifeng , Guo Mengxue , Zhao Mengjie
Published: January 2022

A negative capacitance transistor with fully depleted silicon-on-insulator (FDSOI) technology (NC-FDSOI) is one of the promising candidates for next-generation low-power devices. However, it suffers from the inherent negative differential resistance (NDR) effect, which is very detrimental to device and circuit designs. Aiming at overcoming this shortcoming, this paper proposes for the first time to use local Gaussian heavy doping technology (LoGHeD) in the channel near the drain side to suppress the NDR effect in the NC-FDSOI. The technical computer-aided design simulation results have validated that the output conductance (GDS) with LoGHeD, which is used to measure the NDR effect, increases compared to the conventional NC-FDSOI counterpart and approaches zero. With the increase in doping concentration, the inhibitory capability of the NDR effect shows a monotonously increasing trend. In addition, the proposed approach maintains and even enhances performances of the NC-FDSOI transistor regarding the electrical parameters, such as threshold voltage (VTH), sub-threshold swing, switching current ratio (ION/IOFF), and drain-induced barrier lowering.
Approximate field measures for ionic polymer-metal composite materials and a simplified order-of-magnitude actuator model
Authors: Olsen Zakai J , Kim Kwang J
Published: January 2022

As the field of soft robotics grows and new applications for this technology are discovered, the use of simplified models for the soft actuators found in these devices will be critical. In this study we explore arguments based on the magnitude of field gradients that arise in the ionic polymer-metal composite (IPMC) under large applied voltages and their use for approximating measures of the fields inside the polymer. Using the order-of-magnitude based arguments provides exceptional results for quantifying the field measures of maximum ionic concentration and electric potential within the bulk of the polymer. These measures are leveraged to reconstruct the fields themselves in such a way that the internal bending moments generated inside the actuator may be approximated. With the internal moments, a simplified kinematic model may be used to formulate the steady-state actuator response of the IPMC. This actuator model shows a great deal of accuracy as compared to a full multiphysics model, and we discuss the prospects for future development of this model to account for dynamic actuation.
Transverse instability of dust acoustic solitary waves in magnetized dusty plasma composed of vortex-like distribution ions
Authors: Zhang Juan , Wan Xiao-Huan , Zhou Yu-Shan , Ren Xue-Ping , Wang Jing , Fan Xiao-Bei , Shi Yu-Ren
Published: January 2022

The dynamical behaviors of dusty plasma can be described by a (3+1)-dimensional modified Zakharov-Kuznetsov equation (mZKE) when the distribution of ions is vortex-like. The critical stable conditions for the line solitons are obtained by the linear stability analysis, which are also confirmed by the nonlinear dynamic evolution. An interesting phenomenon is found from the numerical results, maybe the first time, that the unstable line solitons of the mZKE will evolve into one or more completely localized soliton(s) after a long time evolution. Subsequently, we numerically studied the collision process of two line solitons. The results show that two stable line solitons can restore to their original states. However, if one of the two solitons or both of them are unstable, one or more completely localized solitons will appear during the collision. The results indicate that there are both elastic and inelastic collisions between line solitons.
Biophysical and biochemical attributes of hybrid epithelial/mesenchymal phenotypes
Authors: Subbalakshmi Ayalur Raghu , Ashraf Bazella , Jolly Mohit Kumar
Published: January 2022

The epithelial–mesenchymal transition (EMT) is a biological phenomenon associated with explicit phenotypic and molecular changes in cellular traits. Unlike the earlier-held popular belief of it being a binary process, EMT is now thought of as a landscape including diverse hybrid E/M phenotypes manifested by varying degrees of the transition. These hybrid cells can co-express both epithelial and mesenchymal markers and/or functional traits, and can possess the property of collective cell migration, enhanced tumor-initiating ability, and immune/targeted therapy-evasive features, all of which are often associated with worse patient outcomes. These characteristics of the hybrid E/M cells have led to a surge in studies that map their biophysical and biochemical hallmarks that can be helpful in exploiting their therapeutic vulnerabilities. This review discusses recent advances made in investigating hybrid E/M phenotype(s) from diverse biophysical and biochemical aspects by integrating live cell-imaging, cellular morphology quantification and mathematical modeling, and highlights a set of questions that remain unanswered about the dynamics of hybrid E/M states.
Energy and spectral analysis of confined solar flares from radio and X-ray observations
Authors: Tan Cheng-Ming , Klein Karl Ludwig , Yan Yi-Hua , Masuda Satoshi , Tan Bao-Lin , Huang Jing , Yuan Guo-Wu
Published: January 2022

The energy and spectral shape of radio bursts may help us understand the generation mechanism of solar eruptions, including solar flares, coronal mass ejections, eruptive filaments, and various scales of jets. The different kinds of flares may have different characteristics of energy and spectral distribution. In this work, we selected 10 mostly confined flare events during October 2014 to investigate their overall spectral behaviour and the energy emitted in microwaves by using radio observations from microwaves to interplanetary radio waves, and X-ray observations of GOES, RHESSI, and Fermi/GBM. We found that: all the confined flare events were associated with a microwave continuum burst extending to frequencies of 9.4 ∼ 15.4 GHz, and the peak frequencies of all confined flare events are higher than 4.995 GHz and lower than or equal to 17 GHz. The median value is around 9 GHz. The microwave burst energy (or fluence) and the peak frequency are found to provide useful criteria to estimate the power of solar flares. The observations imply that the magnetic field in confined flares tends to be stronger than that in 412 flares studied by Nita et al. (2004). All 10 events studied did not produce detectable hard X-rays with energies above ∼300 keV indicating the lack of efficient acceleration of electrons to high energies in the confined flares.
A more accurate Parameterization based on cosmic Age (MAPAge)
Authors: Huang Lu , Huang Zhi-Qi , Li Zhuo-Yang , Zhou Huan
Published: January 2022

Recently, several statistically significant tensions between different cosmological datasets have raised doubts about the standard Lambda cold dark matter (ΛCDM) model. A recent letter (Huang 2020) suggests to use “Parameterization based on cosmic Age” (PAge) to approximate a broad class of beyond-ΛCDM models, with a typical accuracy ∼1% in angular diameter distances at z ≲ 10. In this work, we extend PAge to a More Accurate Parameterization based on cosmic Age (MAPAge) by adding a new degree of freedom η
2. The parameter η
2 describes the difference between physically motivated models and their phenomenological PAge approximations. The accuracy of MAPAge, typically of order 10−3 in angular diameter distances at z ≲ 10, is significantly better than PAge. We compare PAge and MAPAge with current observational data and forecast data. The conjecture in Huang (2020), that PAge approximation is sufficiently good for current observations, is quantitatively confirmed in this work. We also show that the extension from PAge to MAPAge is important for future observations, which typically require sub-percent accuracy in theoretical predictions.
Integrated control of individual plasma scalars with simultaneous neoclassical tearing-mode suppression
Authors: Pajares Andres , Schuster Eugenio , Thome Kathreen E. , Welander Anders S. , Barr Jayson L. , Eidietis Nicholas W. , Humphreys David A.
Published: January 2022

A novel integrated-control architecture has been tested in nonlinear, one-dimensional simulations using the control-oriented transport simulator (COTSIM©) and in DIII-D experiments. Integrated architectures that can perform continuous-mission control while also handling off-normal events will be vital in future reactor-grade tokamaks. Continuous-mission controllers for individual magnetic and kinetic scalars (thermal stored-energy (W), volume-average toroidal rotation (Ω
ϕ
), and safety factor profile (q) at different spatial locations) have been integrated in this work with event-triggered neoclassical tearing-mode (NTM) suppression controllers by combining them into an architecture augmented by a supervisory and exception handling (S&EH) system and an actuator management (AM) system. The AM system, which enables the integration of competing controllers, solves in real time a nonlinear optimization problem that takes into account the high-level control priorities dictated by the S&EH system. The resulting architecture offers a high level of integration and some of the functionalities that will be required to fulfill the advanced-control requirements anticipated for ITER. Initial simulations using COTSIM suggest that the plasma performance and its MHD stability may be improved under integrated feedback control. In addition, the integrated-control architecture has been implemented in the DIII-D plasma control system and tested experimentally for the first time ever in DIII-D in a high-q
min scenario, which is a candidate for steady-state operation in ITER.
Design and Implementation of Power Network Security Protection System Based on Internet of Things
Authors: Yun Kai , Li Haosheng , Chen Jia
Published: January 2022

With the progress of society, the power industry is also constantly developing. This puts forward higher requirements for the safety of our country’s power grid system. In order to ensure the stable and reliable operation of the power supply network and the economic rationality, stability and security, this article first elaborates the concept of network security and network security management, secondly, it analyzes the network security protection technology. Finally, it studies the design and implementation of a store network security protection system based on the Internet of Things.
Image Search System Based on Machine Learning
Authors: Wang HongLin
Published: January 2022

Since the 21st century, with the continuous maturity of network technology and its integration with the education field, traditional face-to-face communication has gradually expanded to the virtual network environment. In the online learning environment, students can use the online platform to communicate directly with teachers, no longer limited by time and region. The time and space breakthrough of teacher-student interaction has brought development opportunities for teachers to constantly contact students with a long-term management mechanism. Based on this situation, this article uses artificial intelligence technology to build a network communication platform. This article first analyzes the application status of artificial intelligence technology in the network communication platform, and then introduces the artificial intelligence technology applied in this article. Then, this article uses artificial intelligence technology to design a network communication platform, and test the function and performance of the platform. The test results show that the function of the system is very accurate and reliable, and the performance of the system is sufficient to support nearly 10,000 users at the same time.
Digital Print Synthesis Based on Image Processing and Interactive Technology
Authors: Sun Lijun
Published: January 2022

Fire is a common disaster, which causes major threats and losses to human life and property. Countries around the world have been committed to the study of the mechanism and internal mechanism of fires, with the goal of preventing fires from occurring and minimizing the losses caused by fires. Among the many methods, fire detection technology is an effective method to prevent and reduce the occurrence of fire. This article focuses on the research of the fire detection system based on artificial intelligence technology, improves the accuracy of the fire detection system by introducing artificial intelligence technology into the fire detection system, and uses experiments to verify the error rate of the artificial intelligence technology fire detection system. The experimental results show that the system’s detection of fire is not very different from the actual situation, and the error rate is within 10%. Then compared with the traditional detection system, the detection performance is relatively high, and the error rate can be reduced by one time.
Periodic Pattern Detection of Printed Fabric Based on Deep Learning Algorithm
Authors: Xiang Zhong , Shen Yujia , Cheng Zhitao , Ma Miao , Lin Feng
Published: January 2022

Printed fabric patterns contain multiple repeat pattern primitives, which have a significant impact on fabric pattern design in the textile industry. The pattern primitive is often composed of multiple elements, such as color, form, and texture structure. Therefore, the more pattern elements it contains, the more complex the primitive is. In order to segment fabric primitives, this paper proposes a novel convolutional neural network (CNN) method with spatial pyramid pooling module as a feature extractor, which enables to learn the pattern feature information and determine whether the printed fabric has periodic pattern primitives. Furthermore, by choosing pair of activation peaks in a filter, a set of displacement vectors can be calculated. The activation peaks that are most accordant with the optimum displacement vector contribute to pick out the final size of primitives. The results show that the method with the powerful feature extraction capabilities of the CNN can segment the periodic pattern primitives of complex printed fabrics. Compared with the traditional algorithm, the proposed method has higher segmentation accuracy and adaptability.
Dispersion Dynamics of Clustered Particles by Centrifugal Force
Authors: Feng Tiancong
Published: January 2022

In this paper an approach is proposed to solve the problem of aggregation in nanomaterials through the mean of rotational separation aiming to quickly disperse clustered nanoparticles while not affecting their purity. If it is possible, this approach may replace the current mean of mechanical mixing, which may cause impurities issues. The hypothesis is that the centrifugal force due to rotational velocity acting on the nanoparticles can overcome the cohesive force between the nanoparticles, therefore dispersing the clustered nanoparticles. The experimental mean is to put different spheres connected by different types of glues imitating different nanoparticle clusters into centrifuges imitating the swivel plate. The results from both the theoretical model and the experiment show that for a cluster with a cohesive force of 1.75N, a rotational velocity of about 800rad./s is required to disperse the cluster. While for a cluster with a cohesive force of 0.25N and the same mass and position, a rotational velocity of about 150 rad./s is required to disperse the cluster. Except for the cohesive force, the mass and position of the nanoparticle on the swivel plate also have a large effect on the required rotational velocity. The observation of the physical mechanism of the dispersion has also shown that while using this way, the cluster is dispersed slowly with small parts separated from it. Therefore, this way can also eliminate re-clustering problems of nanoparticles.
Study on Correlation of Physical and Mechanical Properties Indexex of Cohesive Soil in Hilly and Plain Region along the Yangtze River in Anhui Province
Authors: Wu Daoxiang , Ye Lei , Zhao Huahong , Wu Leilei , Guo Jiacheng , Ji Bin
Published: January 2022

In this paper, a large number of geotechnical engineering survey data are collected in hilly and plain region along the Yangtze River in Anhui Province. Based on the statistical analysis and calculation of the experimental data of physical and mechanical properties of cohesive soils (the main quaternary soil layers in the area), the correlation between the liquidity index and water content and other physical and mechanical properties indexes are analyzed, and the fitting regression is carried out respectively. The results show that the liquidity index (IL)) and water content (w) are highly correlated with cohesion (C), compression modulus (Es), compression coefficient (α), natural density (ρ), void ratio (e), and the regression equations have high goodness of fit and good fitting effect; In addition, the fitting regression equations of water content, void ratio and natural density are compared with the theoretical calculation formula, it is found that the calculation results are close, which proves that the fitting regression equations are reliable and can be used in engineering practice.
Study on Seismic Performance of UHV Transformer Based on Soil-structure Interaction
Authors: Xue Yaodong , Cheng Yongfeng , Lu Zhicheng , Zhu Zhubing , Wang Haibo , Liu Zhenliu , Zhang Shujun
Published: January 2022

At present, the seismic performance of UHV transformers is mostly studied without considering the interaction between soil and superstructure. In practical engineering, the transformer is installed on the foundation slab buried in the soil. Under the action of earthquake, the interaction between the soil and the structure changes the earthquake response of the upper electrical structure. In order to study the influence of the interaction between soil and structure on the seismic performance of the transformer, the shaking table test method of simulated earthquake is used, and the shaking table test of UHV transformer with scale ratio of 1:4 is carried out in class I field conditions. The dynamic characteristics of the equipment and the seismic response of the bushing under different test conditions are obtained respectively. The test results show that when the peak acceleration is 1.2g, the acceleration response at each measuring point on the box is 1.63-1.92 times that when the peak acceleration is 0.4g. With the increase of seismic peak acceleration, the acceleration and strain increase of high voltage bushing are greater than that of medium and low voltage bushing, which has a great influence on the seismic response of high voltage bushing. The research conclusion can provide reference for substation engineering design.
Experimental Study on Creep of Sandstone under Hydrochemical Corrosion
Authors: Hu Jiangchun , Sun Luge , Feng He , Liu Zhipeng , Wang Qin
Published: January 2022

Corrosion creep of sandstone has great influence on the safety and stability of geotechnical engineering, and it is of great significance to study the creep characteristics of sandstone under the action of hydrochemical corrosion for the long-term stability of geotechnical engineering. Through creep test of corroded rock, the characteristics of rock deformation and strength are analyzed. Combined with electrochemical impedance spectroscopy (EIS), the microcracks of corroded sandstone during creep process are detected, and the variation law of equivalent circuit parameters and the development trend of microcracks during creep process of corroded sandstone are analyzed. The test results show that the creep characteristics of rock samples are related to the hydrochemical environment; The medium-and long-term strength of the solution with high pH value is relatively small, and the difference with uniaxial compressive strength is large; Moreover, there is a certain correlation between creep of rock samples and equivalent circuit parameters. In this paper, the influence of creep deformation, mechanical properties and hydrochemical environment on sandstone creep is analyzed, and the research results can provide reference for stability analysis of related geotechnical engineering.
FLUENT Simulation Design and Optimization of Biological Aerated Filter
Authors: Wang Shuqin , Zhang Zhiqiang , Wang Ning , Zhao Wenqi , Yuan Chungang
Published: January 2022

In this paper, a small biological aerated filter for experimental use was designed, and a method was explored to optimize the nitrogen removal efficiency by using FLUENT software to simulate the particle size of the filler, the amount of the filler, the initial concentration of ammonia nitrogen, dissolved oxygen and other operating parameters. Through the simulation experiment, the optimal design parameters of the particle size of filler, the amount of filler, the initial concentration of ammonia nitrogen and the dissolved oxygen of the biological aerated filter are 4mm, 60%, 15% and 1.5%, respectively, when the removal efficiency of ammonia nitrogen exceeds 30% reported in the literature. It provides a reference for the experimental research and practical application of biological aerated filter (BAF) denitrification.
Seismic Finite Element Analysis of Lightning Arrester Combination by Casing and Pillar Insulator
Authors: Zhang Xiaojun , Liu Zhenlin
Published: January 2022

The seismic performance of electrical equipment in substations has a great impact on the normal operation of the whole substation. The results of the modal analysis show that the fundamental frequency of the three devices is in the range of 0.9Hz∼1.1Hz. The maximum stress of the casing for the three devices is respectively 55.43MPa, 45.39MPa, 35.26MPa, when the peak acceleration 0.4g seismic action is verified. The maximum stress of insulator is respectively 47.01MPa, 62.72MPa and 30.85MPa, and the maximum relative displacement of the top for the equipment is 617.2mm.
Joint Inversion of Rayleigh and Love Dispersion Curves Extracted from Ambient Seismic Noise Based on Secular Function
Authors: Gong Feng , Chen Xiaofei , Fan Youhua , Liu Xuefeng , Tang Haibing
Published: January 2022

Traditional multi-mode dispersion curve inversion requires correct mode discrimination. However, when the stratum contains complex structures such as low-speed soft interlayer or high-speed hard interlayer, the dispersion curve may show phenomena such as “mode kissing” and “mode jumping”, which can easily cause mode misjudgment and lead to erroneous inversion results. Based on the “secular function”, this paper constructs a new type of objective function applied to the inversion of dispersion curve. This objective function does not require prior mode discrimination, which effectively solves the “mode misjudgment” problem of multi-mode dispersion curve inversion. The joint inversion of Rayleigh and Love dispersion curves extracted from ambient seismic noise is used to improve the constraint of the inversion and avoid the inversion falling into a local minimum in the case of a large-scale search of parameters. Finally, a numerical simulation was performed to verify the feasibility of the new inversion method.
Stress Analysis of Vertical Bar Additional Connector at the Joint of Fabricated Shear Wall
Authors: Jiang Haowen , Zhang Yueguo , Fan Handuo , Liu Qikai , Du Linghang
Published: January 2022

Although there are many mainstream reinforcement connection methods, the realization of force transfer between reinforcement is the starting point of all connections and the most important inspection standard. Aiming at the vertical connection of the fabricated shear wall, this paper proposes a new type of additional connector connection, and two fabricated shear walls connected by new types of additional connectors and a cast-in-situ shear wall were established. The dimensions and material parameters of the fabricated shear wall connected by the new additional connector were the same as those of the cast-in-situ shear wall. The finite element software ABAQUS is used to perform static finite element analysis on fabricated shear walls and cast-in-situ shear walls connected by new additional connectors. By comparing the static finite element simulation results, the results show that the new additional connector can ensure the effective force transfer of reinforcement.
Cell lysis analysis for respiratory viruses through simulation modeling
Authors: Cuesta-Herrera L , Pastenes L , Córdova-Lepe F , Arencibia A D , Torres-Mantilla H A
Published: January 2022

An ordinary system of differential equations leading to a simulation model is propose as methodological approach to analysis the incidence of infectious-contagious diseases, in this case using SARS-CoV-2 virus as pathogenic model. The dynamics of the model are drive by the interaction between susceptible cells contemplating respiratory epithelial cells and viral infection mediated by two types of lysis response. To perform the simulations, values of some variables and parameters were selected from referenced sources, considering that previous reports suggested that the viral load in the lower respiratory tract might reach its peak in the second week after the beginning of disease symptoms. The scenarios described in the simulations evidence the performance of the cell lysis response from susceptible cells that have been infected. The recommend model shows that an excess response from both the original virus and the mutated virus leads to an increase in the approximate time to control viral infection within the organism.
Analysis of the mechanical behavior of adobe walls without reinforcement through computational modelling
Authors: Ospina Henao P A , Oñate Ballesteros R D , Peñaranda Vega J S
Published: January 2022

The construction of civil structures on land has played an important role for centuries, however, due to the seismic requirements and the minimum safety standards that are currently required for any structure, this type of construction has been lagged, it is denoted that the related regulations they are widely dispersed and in most cases. In developed countries, numerous technical and legal problems arise to carry out construction with these materials. In relation to this work, a set of models of raw earth type walls are presented, through the SAP 2000 software, having as a supply of the mechanical properties of this material the Peruvian regulation E.080. For the analysis of these models, a static linear analysis for finite elements and a stress analysis of the service limit state concept were studied. Finally, the models with their respective stress studies, management and design recommendations are presented under the criteria of the analyses carried out, leaving open the possibility of both carrying out an experimental phase to develop the analogy with the postulates and proposed results, as well as such as the option to perform a static pressure analysis by finite elements in order to achieve greater precision and calibration of the model with respect to what can be evidenced in laboratory tests.
Solution of Navier-Stokes equations for fluids with magnetorheological compensation used in structures with energy dissipaters
Authors: Medina N Balaguera , Atuesta M A , Nieto O A , Ospina Henao P A
Published: January 2022

The fixed-wall rectangular cavity flow problem is a classic problem that has been studied since the beginning of computational fluid mechanics. The present work aims to provide a numerical and computational solution of the Navier-Stokes equations using the finite difference method, applied to model the problem of a magnetorheological fluid in a rectangular cavity with a fixed wall in shock absorbers devices, used in civil structures that use energy dissipators.