bluuebunny/crossref_metadata_2025_split huggingface dataset:
Disparities in Telemedicine Access: A Cross-Sectional Study of a Newly Established Infrastructure during the COVID-19 Pandemic
Authors: Hsiao Vivian , Chandereng Thevaa , Lankton Robin L. , Huebner Jeffrey A. , Baltus Jeffrey J. , Flood Grace E. , Dean Shannon M. , Tevaarwerk Amye J. , Schneider David F. 
Published: June 2021

Abstract
Background The COVID-19 pandemic led to dramatic increases in telemedicine use to provide outpatient care without in-person contact risks. Telemedicine increases options for health care access, but a “digital divide” of disparate access may prevent certain populations from realizing the benefits of telemedicine.
Objectives The study aimed to understand telemedicine utilization patterns after a widespread deployment to identify potential disparities exacerbated by expanded telemedicine usage.
Methods We performed a cross-sectional retrospective analysis of adults who scheduled outpatient visits between June 1, 2020 and August 31, 2020 at a single-integrated academic health system encompassing a broad range of subspecialties and a large geographic region in the Upper Midwest, during a period of time after the initial surge of COVID-19 when most standard clinical services had resumed. At the beginning of this study period, approximately 72% of provider visits were telemedicine visits. The primary study outcome was whether a patient had one or more video-based visits, compared with audio-only (telephone) visits or in-person visits only. The secondary outcome was whether a patient had any telemedicine visits (video-based or audio-only), compared with in-person visits only.
Results A total of 197,076 individuals were eligible (average age = 46 years, 56% females). Increasing age, rural status, Asian or Black/African American race, Hispanic ethnicity, and self-pay/uninsured status were significantly negatively associated with having a video visit. Digital literacy, measured by patient portal activation status, was significantly positively associated with having a video visit, as were Medicaid or Medicare as payer and American Indian/Alaskan Native race.
Conclusion Our findings reinforce previous evidence that older age, rural status, lower socioeconomic status, Asian race, Black/African American race, and Hispanic/Latino ethnicity are associated with lower rates of video-based telemedicine use. Health systems and policies should seek to mitigate such barriers to telemedicine when possible, with efforts such as digital literacy outreach and equitable distribution of telemedicine infrastructure.
Evaluation of Clinical Decision Support to Reduce Sedative-Hypnotic Prescribing in Older Adults
Authors: Joglekar Natasha N. , Patel Yatindra , Keller Michelle S. 
Published: June 2021

AbstractObjective We sought to characterize the performance of inpatient and outpatient computerized clinical decision support (CDS) alerts aimed at reducing inappropriate benzodiazepine and nonbenzodiazepine sedative medication prescribing in older adults 18 months after implementation.Methods We reviewed the performance of two CDS alerts in the outpatient and inpatient settings in 2019. To examine the alerts' effectiveness, we analyzed metrics including overall alert adherence, provider-level adherence, and reasons for alert trigger and override.Results In 2019, we identified a total of 14,534 and 4,834 alerts triggered in the outpatient and inpatient settings, respectively. Providers followed only 1% of outpatient and 3% of inpatient alerts. Most alerts were ignored (68% outpatient and 60% inpatient), while providers selected to override the remaining alerts. In each setting, the top 2% of clinicians were responsible for approximately 25% of all ignored or overridden alerts. However, a small proportion of clinicians (2% outpatient and 4% inpatient) followed the alert at least half of the time and accounted for a disproportionally large fraction of the total followed alerts. Our analysis of the free-text comments revealed that many alerts were to continue outpatient prescriptions or for situational anxiety.Conclusion Our findings highlight the importance of evaluation of CDS performance after implementation. We found large variation in response to the inpatient and outpatient alerts, both with respect to follow and ignore rates. Reevaluating the alert design by providing decision support by indication may be more helpful and may reduce alert fatigue.
Development of an 11-channel multi wavelength imaging diagnostic for divertor plasmas in MAST Upgrade
Authors: Feng X. , Calcines A. , Sharples R. M. , Lipschultz B. , Perek A. , Vijvers W. A. J. , Harrison J. R. , Allcock J. S. , Andrebe Y. , Duval B. P. , Mumgaard R. T. ,   MAST-U Team,   EUROfusion MST1 Team
Published: June 2021

Divertor detachment and alternative divertor magnetic geometries are predicted to be promising approaches to handle the power exhaust of future fusion devices. In order to understand the detachment process caused by volumetric losses in alternative divertor magnetic geometries, a Multi-Wavelength Imaging (MWI) diagnostic has recently been designed and built for the Mega Amp Spherical Tokamak Upgrade. The MWI diagnostic will simultaneously capture 11 spectrally filtered images of the visible light emitted from divertor plasmas and provide crucial knowledge for the interpretation of observations and modeling efforts. This paper presents the optical design, mechanical design, hardware, and test results of an 11-channel MWI system with a field of view of 40°. The optical design shows better than 5 mm FWHM spatial resolution at the plasma on all 11 channels across the whole field of view. The spread of angle of incidence on the surface of each filter is also analyzed to inform the bandwidth specification of the interference filters. The results of the initial laboratory tests demonstrate that a spatial resolution of better than 5 mm FWHM is achieved for all 11 channels, meeting the specifications required for accurate tomography.
A novel method for Lorentz force detuning compensation in multi-cell superconducting RF cavity and its validation at room temperature
Authors: Singh Kuldeep K. , Jain Vikas K. , Ghodke Dharmraj V. , Puntambekar Avinash 
Published: June 2021

A tuner is an important element of a superconducting radio frequency (SCRF) cavity, which is used to tune the cavity at resonance frequency. The measurement and control of the pulsed detuning phenomenon is very challenging and can be measured in the superconducting state of the cavity at a high voltage gradient. This paper describes an innovative method and unique approach for the measurement of dynamic changes in resonance frequency of the SCRF cavity even at room temperature. For this purpose, a 1.3 GHz nine-cell prototype dressed cavity with RRCAT’s designed X-link tuning device is used. A test setup for measurements of dynamic changes in resonance frequency of the RF cavity has been designed and developed. The cavity response for piezo-excitation at various pulse widths has been determined. In order to simulate the Lorentz force detuning (LFD) effect, the source frequency has been modulated similar to the superconducting scenario in the SCRF cavity. To compensate the simulated detuning, a fast tuner is operated with half sinusoidal pulses at various combinations of pulse width and time advance to find out an optimum waveform. This optimized waveform will be used with a fast tuning control system to control LFD under actual operation conditions of the SCRF cavity.
Scattering of mesons in quantum simulators
Authors: Surace Federica Maria , Lerose Alessio 
Published: June 2021

Abstract
Simulating real-time evolution in theories of fundamental interactions represents one of the central challenges in contemporary theoretical physics. Cold-atom platforms stand as promising candidates to realize quantum simulations of non-perturbative phenomena in gauge theories, such as vacuum decay and hadron collisions, in prohibitive conditions for direct experiments. In this work, we demonstrate that present-day quantum simulators can imitate linear particle accelerators, giving access to S-matrix measurements of elastic and inelastic meson collisions in low-dimensional abelian gauge theories. Considering for definiteness a (1 + 1)-dimensional

Z

2

-lattice gauge theory realizable with Rydberg-atom arrays, we present protocols to observe and measure selected meson–meson scattering processes. We provide a benchmark theoretical study of scattering amplitudes in the regime of large fermion mass, including an exact solution valid for arbitrary coupling strength. This allows us to discuss the occurrence of inelastic scattering channels, featuring the production of new mesons with different internal structures. We present numerical simulations of realistic wavepacket collisions, which reproduce the predicted cross section peaks. This work highlights the potential of quantum simulations to give unprecedented access to real-time scattering dynamics.
On the algebra and groups of incompressible vortex dynamics
Authors: Müller Annette , Névir Peter 
Published: June 2021

Abstract
An algebraic representation for 2D and 3D incompressible, inviscid fluid motion based on the continuous Nambu representation of Helmholtz vorticity equation is introduced. The Nambu brackets of conserved quantities generate a Lie algebra. Physically, we introduce matrix representations for the components of the linear momentum (2D and 3D), the circulation (2D) and the total flux of vorticity (3D). These quantities form the basis of the vortex-Heisenberg Lie algebra. Applying the matrix commutator to the basis matrices leads to the same physical relations as the Nambu bracket for this quantities expressed classically as functionals. Using the matrix representation of the Lie algebra we derive the matrix and vector representations for the nilpotent vortex-Heisenberg groups that we denote by VH(2) and VH(3). It turns out that VH(2) is a covering group of the classical Heisenberg group for mass point dynamics. VH(3) can be seen as central extension of the abelian group of translations. We further introduce the Helmholtz vortex group V(3), where additionally the angular momentum is included. Regarding application-oriented aspects, the novel matrix representation might be useful for numerical investigations of the group, whereas the vector representation of the group might provide a better process-related understanding of vortex flows.
Characteristics of Lead and Zinc Polymetallic Deposit and Wall Rock Alteration Zoning in Luziyuan, Yunnan
Authors: Zeng Lei , Fan Li , Yao Si , Peng Feng , Yang Shan , Li Honggang , Liu Kun , Zhang Ke 
Published: June 2021

Abstract
Luzi Yuan lead and zinc polymetallic deposit is located at Zhenkang anticlinorium which is on the south section of baoshan block. Four main mineralized zones are included in this area, namely I, II, III and V. Among them, II-V1, II-V3 and III-V5 in NO II mineralized zone contain the main orebodies. Througn research the author believes that the deposit shows obvious mineralization alteration zonality from deep to superficial part. It appears that the orebodies are controlled by faulted structure and occur as banded, stratified, stratoid and veined in form along faut fractured zone in the trend of northeast. The analysis and summary of characteristics of mineralization and associated elemengts in this area in this paper provided basis for future prospecting works.
Characteristics of Tight Sandstone Cement in Panke Area
Authors: Shasha Yang , Yong Yang , Ying Chen , Kuanhong Xing , Kaide Liu 
Published: June 2021

Abstract
In order to improve the success rate of oil and gas exploration and further study the impact of tight sandstone cements on reservoirs, this paper uses a large number of rock thin sections, scanning electron microscopy, and physical property analysis to analyze the cements of the Chang 6 reservoir in the Panke area, southern Ordos Basin. Features have been studied in depth. The results show that the cements in the study area mainly include: authigenic cements such as illite and chlorite, carbonate cements such as iron calcite and iron dolomite, and siliceous cements. As the depth of the stratum increases and the temperature rises, the content of illite gradually increases; the main distribution area of chlorite cement is shallower than that of illite; with the increase of buried depth, the content of carbonate cement has a increase trend ; The content of siliceous cement in the deeper stratum is higher than that in the shallow layer.
Test and Analysis of Velocity Law of Flowing Water in Stratum of Bottom Contact Passages in Shield River-Crossing Section
Authors: Xiong Dongdong , Xu Chao , Song Xiangshuai 
Published: June 2021

Abstract
The method of combined hole arrangement on both banks and in the middle of the river was proposed for the test and analysis of the flowing water velocity in contact passages at the bottom of the Wulong River in order to address the insufficient reliability of the existing testing method for the flowing water velocity in the bottom stratum and its failure to truly reflect the data and law of the velocity in the stratum of bottom contact passages in the shield section. Meanwhile, the measurement time of each measuring hole has experienced the fluctuation cycle of the water level, enabling the parameters and law of the flowing water velocity obtained from the test to cover the complete spatial and temporal distribution range. Compared with the existing research, the method has a greatly improved data reliability, guiding the freezing reinforcement construction of bottom contact passages successfully. At the same time, the flow distribution law, velocity range and the law of influence of water fluctuation on the flow velocity revealed in this test can provide reference for related engineering projects in the region.
Research on Deformation Treatment and Control Technology of Tail Shield of Underwater Large Diameter Slurry Shield
Authors: Han Xiaoming , Zhang Feilei , He Yuan , Zhong Han 
Published: June 2021

Abstract
The Karnaphuli River underwater tunnel in Bangladesh is located at the estuary of the Karnaphuli River and is constructed with a Φ12.12m air-cushioned slurry pressure balance shield machine. The bottom section of the river mainly passes through a dense silty fine sand stratum, of which the standard penetration value and strength are high. When the shield tunneling got into to the sea area, the tail shield was significantly and unevenly deformed, which caused the shield machine to be trapped in the river bottom. Therefore, the characteristics and causes of the deformation of the shield tail during the tunneling boring process were analyzed on this basis. Studies have shown that the deformation of the tail shield was a gradual development process. If there is a slight lack of rigidity of the outer shell and tail shield on the outside of the shield, it tells that the large resistance of the ground caused by the deviation of shield tunneling is the main reason for the deformation. Besides, given the construction characteristics of the underwater shield and the limited working space in the shield machine, a linear rectification tool was designed. By summing up the rectification methods of the hole making in the tail shield, decompression with sand discharge, and incremental launching with loaded, local deformation of the tail shield was realized, so the trapped shield machine was successfully released. Finally, through the excavation experience after the shield restart, it is concluded that within 5cm of the tail shield steel plate deformation, the experience of deformation rebound can be achieved through measures such as sand discharge through radial holes and bentonite injection, which provides a reference for similar engineering projects in the future.
Connections for Bamboo Structures
Authors: Lao Hange 
Published: June 2021

Abstract
Bamboo is an outstanding, widely used historical green building material that features high strength, economic, and sustainability. The joints in a structure are the important points for resisting the loads. However, the connection of bamboo pole is always the major challenge during the construction. The thin-wall, hollow and other irregularities of this natural material contribute to the challenges of making connection systems. To utilising bamboo in the construction industry, this paper summarises the existing bamboo connection methods including both traditional and modern ones.
GFRP erosion depth model under alkaline solution erosion
Authors: Li Jiaxing , Yang Yongxin , Jia Bin , Huang Hui , Li Biao , Wang Tao 
Published: June 2021

Abstract
Based on the physical phenomenon of the fiber reinforced polymer material after the erosion of the liquid medium, the erosion law of the liquid medium on the FRP is analyzed. And considering the anisotropy of the FRP material, a FRP point source erosion depth model based on Fick’s law is proposed. Taking the glass fiber reinforced polymer (GFRP) in alkali solution as an example, we carried out GFRP corrosion and aging test in alkaline solution, and the erosion depth of GFRP specimens was measured at 30, 90, 180, 360 and 720 days, respectively. At the same time, the water absorption rate of GFRP was used to calculate the erosion diffusion coefficient of solution medium. Through the comparison between the experimental value of erosion depth and the calculated value of erosion depth model, the error between the experimental data and the calculated data is within 10%, and the overall regularity is consistent. It shows that the erosion depth model of liquid medium proposed in this paper is reasonable and has high accuracy.
Study on Properties of Ultra-Light Thermal Insulation Foamed Cement-Based Composites
Authors: Gao Yuxin , Cheng Baojun , Kang Shengrong , Ma Pengfei 
Published: June 2021

Abstract
In this paper, ordinary portland cement, aerogel powder, graphite modified polystyrene (EPS) particles, foaming agent and additives were used to successfully prepare ultra-light insulation foamed cement-based composite with dry density of 120 kg/m3. The effects of graphite modified EPS particles on its density, mechanical properties and thermal conductivity were studied. The research results show that: When adding graphite modified EPS particles with volume content of 30%, the foam concrete has the best performance, with compressive strength of 0.25 MPa and thermal conductivity of 0.0326 W/(m·K); It shows that the compressive strength can be maximized and the thermal conductivity can be minimized when the filling amount of graphite modified EPS particles and the pore structure of foamed cement-based materials reach the best composite ratio.
Thermal Behavior and Stress Response of Steel-concrete Structures under Solar Radiation
Authors: Liu Fatong , Liu Xiaorui , Wang Jie , Sun Ke 
Published: June 2021

Abstract
Steel-concrete structures are widely used because of their large space and strong plasticity, but the long construction period, complex splicing process and other factors will make the main body of the structure directly exposed to solar radiation, resulting in temperature changes on the surface of steel structure and concrete structure. In order to obtain the stress changes of steel-concrete structures under solar radiation, two kinds of steel-concrete structures with different support forms were simulated. Under three temperature gradients, the thermal behavior and mechanical properties of two kinds of steel-concrete structures composed of upper steel roof and lower concrete support were analyzed. The results show that there is a linear relationship between the thermal behavior and stress response of steel-concrete structure and the daily temperature difference caused by solar radiation. Under the action of thermal effect, the stress difference between the lower steel frame of the full support structure and the lower steel frame of the support structure on both sides is about 10.7%.
Analysis of the Sustainability of Bridges
Authors: Hang Hung Wai 
Published: June 2021

Abstract
Bridge is an indispensable infrastructure since ancient times, and the structure types of bridge are divided into beam type, arch type, cable-stayed bridge and suspension bridge. Bridges need to be safe and strong for a long time. Architects are always looking for ways to make Bridges last longer. This paper analyzes the sustainability of bridges. The way to extend the service life of the bridge will be discussed.
Cracking Analysis of Shield Construction Segments Based on Boss Unevenness
Authors: Pi Chunming , Zeng Dexing , Liu Wen , Yao Xiangchuan 
Published: June 2021

Abstract
As the most basic structural unit of shield tunnel, the segment will cause tunnel quality problems and ultimately affect the service life of the tunnel. Based on the actual project, this paper takes the segmental cracking phenomenon in the a large diameter shield tunnel as the research object, and analyzes the influence of the three protruding bosses of the cracked segment itself and the adjacent small ring on the segment cracking. Mechanical analysis, and finite element simulation of the force form of the tube under the unevenness of the boss. Through analysis, it is found that the three bosses of the cracked tube itself have little effect on the cracking of the segment, and the unevenness of the annular seam is the main cause of cracking of the segment. The analysis of this paper can take effective control measures to reduce the impact of cracks in shield tunnels on the normal construction of shield tunnels.
Study on icing mechanism of porous asphalt pavement
Authors: Xie Jianguang , Wang Zhaoxin , Wang Zhanqi 
Published: June 2021

Abstract
Cold weather influents most parts of China in winter. Pavements are easy to freeze, and the frozen pavements can affect traffic safety and reduce traffic efficiency. For porous asphalt pavement, low temperature has more serious effect on it and it is easier to freeze. The paper takes porous asphalt pavement as the research object, simulates its freezing phenomenon in winter, and measures the ice thickness and freezing depth. The freezing process of porous asphalt pavement is deduced.
Stability analysis and repair of a garbage dam
Authors: Wang Xiaohua 
Published: June 2021

Abstract
Garbage dam is an important structure of sanitary landfill, but there is no systematic stability calculation method at present. In this paper, the present situation of a garbage dam is investigated in detail, and it is found that the local settlement of the dam body is large, and there is the possibility of instability. Then, the soil samples were collected from the dam body and the indoor geotechnical tests were carried out. Based on the test data, the GEO-SLOPE software is used to carry out the numerical simulation analysis of the garbage dam. The results of the numerical analysis show that the safety factor of the garbage dam does not meet the requirements of the code, and there is a risk of instability. In view of the problems existing in the dam body, this paper puts forward the solutions for the reinforcement of the dam body, which effectively eliminates the problems of Seepage Damage and crack damage. The results show that the numerical analysis is correct and the reinforcement effect is effective.