bluuebunny/crossref_metadata_2025 huggingface dataset:
A mixing coupling scheme for spectra of singly heavy baryons with spin-1 diquarks in P-waves
Authors: Jia Duojie , Pan Ji-Hai , Pang Cheng-Qun
Published: May 2021

A new scheme of state classification is proposed and applied to analyze masses of the heavy baryons $$\varOmega _{Q}$$

Ω
Q

, $$\varSigma _{Q}$$

Σ
Q

and $$\varXi _{Q}^{\prime }$$

Ξ

Q

′

in P-waves. The results confirm all excited $$\varOmega _{c}$$

Ω
c

and $$\varOmega _{b}$$

Ω
b

baryons reported recently by LHCb to be bound states of a P-wave ss-diquark and a respective charm or bottom quark, and thereby predict Regge trajectories for more excited $$\varOmega _{c}$$

Ω
c

and $$\varOmega _{b}$$

Ω
b

baryons. We suggest one excited $$J^{P}=5/2^{-}$$

J
P

=
5
/

2
-

$$\varOmega _{b}$$

Ω
b

state to be unseen by LHCb around 6352 MeV, and predict P-wave masses of all spin-partners of the odd-parity baryons $$\varSigma _{c}(2800)/\varXi _{c}^{\prime }(2942)$$

Σ
c

(
2800
)

/

Ξ

c

′

(
2942
)

and $$\varSigma _{b}(6097)$$

Σ
b

(
6097
)

/$$\varXi _{b}^{\prime }(6227)$$

Ξ

b

′

(
6227
)

. A computation is further given in a relativized potential quark models to explain matched values of spin couplings of all considered baryons, by which a scaling law for these spin couplings is discussed.
Dirac particles in the presence of a constant magnetic field and harmonic potential with spin symmetry
Authors: Chenaghlou Alireza , Aghaei Sohrab , Niari Negar Ghadirian
Published: May 2021

In this paper, we study the effect of the constant magnetic field on energy levels of the Dirac particles such as electron, proton and heavy ions. We calculate the energy eigenvalues of the Dirac equation in the presence of the magnetic field and two-dimensional harmonic oscillator potential with spin symmetry by using the supersymmetric quantum mechanics and asymptotic iteration methods.
Numerical Feature Transformation-based Sequence Generation Model for Multi-disease Diagnosis
Authors: Yuan Ming , Ren Jiangtao
Published: May 2021

The goal of computer-aided diagnosis is to predict patient’s diseases based on patient’s clinical data. The development of deep learning technology provides new help for clinical diagnosis. In this paper, we propose a new sequence generation model for multi-disease diagnosis prediction based on numerical feature transformation. Our model simultaneously uses patient’s laboratory test results and clinical text as input to diagnose and predict the disease that the patient may have. According to medical knowledge, our model can transform numerical features into descriptive text features, thereby enriching the semantic information of clinical texts. Besides, our model uses attention-based sequence generation methods to achieve the diagnosis of multiple diseases and better utilizes the correlation information between multiple diseases. We evaluate our model’s performance on a dataset of respiratory diseases from the real world, and experimental results show that our model’s accuracy reaches 42.75%, and the [Formula: see text] score reaches 65.65%, which is better than many other methods. It is suitable for the accurate diagnosis of multiple diseases.
FEM Free Damage Detection of Beam Structures Using the Deflections Estimated by Modal Flexibility Matrix
Authors: He Wen-Yu , Ren Wei-Xin , Cao Lei , Wang Quan
Published: May 2021

The deflection of the beam estimated from modal flexibility matrix (MFM) indirectly is used in structural damage detection due to the fact that deflection is less sensitive to experimental noise than the element in MFM. However, the requirement for mass-normalized mode shapes (MMSs) with a high spatial resolution and the difficulty in damage quantification restricts the practicability of MFM-based deflection damage detection. A damage detection method using the deflections estimated from MFM is proposed for beam structures. The MMSs of beams are identified by using a parked vehicle. The MFM is then formulated to estimate the positive-bending-inspection-load (PBIL) caused deflection. The change of deflection curvature (CDC) is defined as a damage index to localize damage. The relationship between the damage severity and the deflection curvatures is further investigated and a damage quantification approach is proposed accordingly. Numerical and experimental examples indicated that the presented approach can detect damages with adequate accuracy at the cost of limited number of sensors. No finite element model (FEM) is required during the whole detection process.
Review of "Rhetorical work in emergency medical services: Communicating in the unpredictable workplace by Elizabeth Angeli," Angeli, E. L. (2019). Rhetorical work in emergency medical services: communicating in the unpredictable workplace. Routledge
Authors: Weems Elizabeth E.
Published: May 2021

In
Rhetorical Work in Emergency Medical Services: Communicating in the Unpredictable Workplace
(2019), Elizabeth L. Angeli explores the unpredictable workplaces which are the locations of emergency medical services provided by first responders, the EMS personnel who receive 911 calls but may have little idea about what to expect once they arrive at the site of the emergency. While rhetoric of health medicine (RHM) is not a new area of rhetoric, Angeli found little research about EMS professional rhetoric, leaving a void in understanding the modes of communication in these ever-changing, life-altering workplaces. Her text began as part of her dissertation project but morphed into a rhetorical analysis/EMS rhetorical training pedagogy for Technical Professional Communication (TPC) and RHM as well as EMS trainers and trainees.
Common membership across SIGs
Authors: Pérez-Quiñones Manuel
Published: May 2021

Conferences allow for sharing of knowledge in a particular domain, computing education for us. Many of us tend to participate in different conferences. CS Educators, after all, teach CS covering all areas of CS. This means that many of us are also members of other ACM SIGs.
ITiCSE 2021 preview
Authors: Schulte Carsten , Becker Brett
Published: May 2021

This year, ITiCSE will come to you from a virtual Paderborn, Germany. Not being bound by normal constraints, the conference will run from June 26th to the 1st of July. Paderborn is a University and Cathedral city, dating back more than 1,200 years. It is home to over 150,000 people and is the second largest, but most beautiful city, in the East Westphalia-Lippe region in Germany. Walking through Paderborn is like walking through the centuries. The cityscape unmistakably mirrors the city's eventful history. The centre alone contains more than twenty historical buildings of all architectural epochs.
Directed Technical Change in Labor and Environmental Economics
Authors: Hémous David , Olsen Morten
Published: May 2021

It is increasingly evident that the direction of technological change responds to economic incentives. We review the literature on directed technical change in the context of environmental economics and labor economics, and we show that these fields have much in common both theoretically and empirically. We emphasize the importance of a balanced growth path and show that the lack of such a path is closely related to the slow development of green technologies in environmental economics and to growing inequality in labor economics. We discuss whether the direction of innovation is efficient.
(Invited) Thermal Transport in Multi-component Nanoparticle Superstructures
Authors: Stahley James B , Zanjani Mehdi
Published: May 2021

This works presents a computational study of thermal properties of nanoparticle assemblies. Thermal management in micro- and nano-scale structures is of great significance in applications such as electronic devices. We investigate phonon transport and thermal properties of hybrid organic-inorganic nanocrystal assemblies using Molecular Dynamics simulations. The results demonstrate the dependence of thermal conductivity and phonon transport on various features of nanocrystalline structures and provide insight for future investigation of phononic spectrum of superstructures with complex, multi-component building blocks.
(Invited) Crystalline Oxide Semiconductor Applicable to Low-Power Consumption Edge AI
Authors: Kunitake Hitoshi , Baba Haruyuki , Okuno Naoki , Ito Yuki , Takahashi Masahiro , Jimbo Yasuhiro , Hodo Ryota , Kurokawa Yoshiyuki , Onuki Tatsuya , Sasagawa Shinya , Yamane Yasumasa , Yamazaki Shunpei
Published: May 2021

An oxide semiconductor field-effect transistor (OSFET) using c-axis-aligned crystalline indium–gallium–zinc oxide (CAAC-IGZO) exhibits extremely low off-state current (Ioff) and can be fabricated at a low process temperature that is 400°C or lower. The features indicate that the CAAC-IGZO FET is suitable for a monolithic stacking process and application to artificial intelligence (AI). This paper shows electric characteristics of the CAAC-IGZO FET and their factors.
Performance Assessment of Amorphous HfO2-Based RRAM Devices for Neuromorphic Applications
Authors: Ossorio Oscar G. , Vinuesa Guillermo , Garcia Hector , Sahelices Benjamin , Duenas Salvador , Castan Helena , Perez Eduardo , Kalishettyhalli Mahadevaiah Mamathamba , Wenger Christian
Published: May 2021

The use of thin layers of amorphous hafnium oxide has been shown to be suitable for the manufacture of Resistive Random-Access memories (RRAM). These memories are of great interest because of their simple structure and non-volatile character. They are particularly appealing as they are good candidates for substituting flash memories. In this work, the performance of the MIM structure that takes part of a 4 kbit memory array based on 1-transistor-1-resistance (1T1R) cells was studied in terms of control of intermediate states and cycle durability. DC and small signal experiments were carried out in order to fully characterize the devices, which presented excellent multilevel capabilities and resistive-switching behavior.
Computational Analysis of Joule Heating Effect in Triple Material Gate AlGaN/GaN High Electron Mobility Transistor
Authors: Kashem Md Tashfiq Bin , Subrina Samia
Published: May 2021

A two-dimensional electro-thermal model has been developed to investigate the Joule heating effect in triple material gate (TMG) aluminum gallium nitride (AlGaN) / gallium nitride (GaN) high electron mobility transistor (HEMT) using the software COMSOL. The current continuity and heat transport equations are solved self-consistently to obtain the temperature distribution profile in various layers of the device. By comparing with dual material gate and single material gate HEMTs, it has been found that, besides providing better current carrying capability, TMG HEMT shows optimum thermal performance. Effects of several device parameters like total channel length, spontaneous and piezoelectric polarization induced charges and ratio of lengths of control and screen gates, on the thermal efficiency have been explored. Bias voltage and underlying substrate material dependence of the device operation have also been investigated.
Investigation of Electrical and Optical Properties of Low Resistivity Indium Oxide Thin Films
Authors: Sundaresh Sreeram , Nehate Shraddha Dhanraj , Sundaram Kalpathy B.
Published: May 2021

Indium oxide (In2O3) films were deposited by reactive sputtering using an indium target in the presence of oxygen and argon as sputtering gases. The electrical and optical properties of In2O3 films specifically sheet resistance, resistivity, optical transparency, refractive index, and optical bandgap were investigated as a function of oxygen gas flow ratio, keeping the substrate at room temperature. The lowest reported resistivity in this study is 2 x 10-3 Ω-cm. The optical transmission was more than 80% in the wavelengths of 400 nm to 800 nm. The optical study revealed the wide optical bandgap of 3.875 eV of the deposited In2O3 films. The films showed refractive indices in the range of 1.99 to 2.22. The elemental composition of In2O3 films has been studied through X-ray Photoelectron Spectroscopy (XPS).
Optical Properties and HR-XRD Study of /InGaAs/Al Ga As/GaAs Structures with InAs Quantum Dots and Different Capping Layers
Authors: Polupan Georgiy v. , Cisneros-Tamayo Ricardo , Torchynska Tetyana
Published: May 2021

The Al0.30Ga0.70As /InGaAs/AlGaInAs/ Al0.30Ga0.70As structures with embedded InAs quantum dots (QDs) covered by strain reduced AlGaInAs capping layers have been investigated in an as-grown state using the photoluminescence (PL) and high resolution X ray diffraction (HR-XRD) methods. Two types of QD structures with different quantum well (QW) capping layers: Al0.10In0.15Ga0.75As (#1) and Al0.40In0.15Ga0.45As (#2), and buffer QW layers: In0.15Ga0.85As (#1) and In0.25Ga0.75As (#2) are compared. It is revealed that QD emission in the structure with Al0.10In0.15Ga0.75As capping (#1) is characterized by the higher PL intensity of the ground state (GS) band and smaller the full with at half maximum (FWHM), compared to those in #2. The variation of the GS emission intensity versus temperature has been monitored within the range of 10-500K. It was revealed more significant PL thermal quenching in #1 compared with #2. HR-XRD study has shown that the both QD structures are characterized by the best quality of the QW interfaces with the high numbers of Pendellösung peaks. The analysis of HR-XRD scans permits to estimate the values of the elastic strains in the studied QD structures, which were higher in #2 compared with #1. The peculiarities of PL spectra and HR-XRD are analyzed and the advances of studied QD structures have been compared and discussed.
X-Ray Photoemission Investigation of the Beryllium Oxide Band Alignment with Magnesium Oxide and Estimates for Other Insulating and Conducting Oxides
Authors: Koh Donghyi , Hudnall Todd W , Bielawski Chris W , Banerjee Sanjay , Brockman Justin , Kuhn Markus , King Sean W
Published: May 2021

Beryllium oxide (BeO) is a wurtzite structured, large bandgap (E
g > 8 eV) material of significant interest as an alloying agent and cladding dielectric in various oxide based optoelectronic devices. The success of such devices is highly reliant on bandgap and band alignment engineering to achieve sufficient charge carrier and optical confinement for device operation. In this regard, we have utilized x-ray photoemission spectroscopy (XPS) to determine the valence band offset (VBO) between atomic layer deposited (ALD) BeO and a (001) oriented magnesium oxide (MgO) substrate. The BeO VBO with MgO (001) was determined to be 0.1 ± 0.15 eV. Applying the rules of commutativity and transitivity for band alignment, we additionally predict the BeO VBO with other conductive oxides such as ZnO, Ga2O3, and InGaZnO4, to be 1.15 ± 0.3 eV, 0.3 ± 0.2 eV, and 0.9 ± 0.2 eV, respectively.
(Gordon E. Moore Award) Impact of Micro-/Nano-Electronics, Miniaturization Limit, and Technology Development for the Next 10 Years and After
Authors: Iwai Hiroshi
Published: May 2021

Electronics started at the beginning of the 20th century with the invention of vacuum tubes. Since then, downsizing of the electron devices has started in order to improve the cost, operational speed, power consumption, volume, weight, etc. In the early 1970s, 10 μm PMOS LSI (large scale integrated circuits) technology provided the first microprocessor. This was the beginning of micro-electronics. Now, the minimum feature size of CMOSLSIs has reached 10 nm range and we call it ‘nano-electronics’. Probably, electronics was the most important technological revolution in the 20th century. Then, micro-/nano-electronics is the 2nd revolution. Without the micro-/nano-electronics, today’s smart society with internet and artificial intelligence would not exist. For the further progress of the modern smart society, the continuation of the MOSFET downsizing is important. The downsizing is expected to reach its limit very soon when the gate length of MOSFETs reaches around 10 nm, by the practical reasons which are the increase of off-leakage current and the saturation in performance, as well as the cost increase. However, until reaching the limit, there are so many things to develop in order to keep the Moore’s law as long as the merit is still huge. They are 3D integration, introduction of new materials into interconnects, and resolution improvement of EUV lithography. Finally, Moore’s law is expected to stop in 10 years or so, but the market demands for the CMOSLSIs as well as other semiconductor devices will keep increasing in the future smart society.
Development of Catalyst with Optimum Calcination Temperature for the Application of Zinc-Air Battery
Authors: Kato Yoshiki , Rahman Md Mijanur , Saikawa Masato , Awata Rina , Ono Yuji , Batnyagt Garavdorj , Delgertsetsega Byambasuren , Takeguchi Tatsuya
Published: May 2021

Zinc-air batteries (ZABs) have several challenges that hamper large-scale commercialization because of cost, charge/discharge performance of the cathode catalyst. To overcome these problems, perovskite oxides such as LaSr3Fe3O10 (LSFCO) catalysts, were prepared using the complex polymerization synthesis method to investigate the relationship between catalyst activity and calcination temperature. The particle diameter of the prepared LSFCO catalysts and the crystalline structure of the perovskite samples were increased with increasing calcination temperature. In the case of 1400ºC, the highest catalytic activity of the LSFCO catalyst was derived from CV analyses and the constant current charge/discharge measurement for ZABs. It is suggested that the high catalytic activity of the LSFCO catalyst can be obtained by providing a high calcination temperature with larger particles.
Sulfur and Nitrogen Co-Doping Bismuth-Based Catalysts for Selective Electroreduction of CO2 to Formate
Authors: Shao Xiaolin , Liu Yuyu , Zhang Jiujun
Published: May 2021

Since the greenhouse effect is an urgent problem, the conversion of greenhouse gas CO2 into valuable chemicals and low-carbon fuels by electrocatalysis is a promising way and has attracted comprehensive attention. In recent years, metal sulfides have shown catalytic performance for electrocatalytic reduction of CO2. However, the existing catalysts still face the problems such as insufficient activity, poor conductivity and low stability. Here, we synthesized a bismuth-based catalyst doped with sulfur by electroreducing Bi2S3 precursor, which is obtained by one-pot hydrothermal reaction, and simultaneously modified catalyst with nitrogen atoms using N,N-Dimethylformamide (DMF) as nitrogen source. The experimental results show that maximum faradaic efficiency of formate can reach 85% at -0.96V (vs. RHE) with the largest current density of 30mA/cm2 and a long-term tolerance in reduction process. Combined with other experimental results, the better catalytic performance is mainly attributed to the improvement of the electron structure on the surface of the catalyst by sulfur and nitrogen co-doping. This work not only provides a simple way of sulfur and nitrogen co-doping, but also explores the transformation of Bi2S3 during electrochemical reduction, further providing an idea for the design of catalysts from metal sulfides.
An Online Gas Chromatography Cell Setup for Accurate CO2-Electroreduction Product Quantification
Authors: Diercks Justus S. , Pribyl-Kranewitter Bernhard , Herranz Juan , Chauhan Piyush , Faisnel Antoine , Schmidt Thomas J.
Published: May 2021

The electrochemical reduction of carbon dioxide (CO2) constitutes an increasingly important scientific topic and research on novel electrocatalysts for this demanding reaction is constantly increasing. One of the most important properties to be inferred for such electrocatalysts is their product selectivity and potential dependence thereof. However, the wide range of materials currently employed in CO2 electroreduction (e.g., Ag, Cu, Pd) entails a large variety of gaseous and/or liquid reaction products for which accurate quantification implies a major challenge. With this motivation, in this study we present an online gas chromatography cell setup specifically designed for the accurate and reproducible determination of the product selectivities of CO2-reduction electrocatalysts. Therewith, we assess the parameters influencing the cell’s performance and point out important design features, such as reproducible electrode alignment, minimized contact resistances and a low ratio among electrolyte volume and the electrodes’ geometrical surface area. The setup was validated by performing measurements on a Pt nanoparticle catalyst for which H2 is the only expected reduction product, while a Pd nanoparticle catalyst was subsequently used to verify its capabilities for CO2 electroreduction selectivity measurements involving multiple liquid and gaseous products.
Very Early-Onset Inflammatory Bowel Disease (VEO-IBD) Presenting with Recurrent Leukocytoclastic Vasculitis Preceded by Streptococcal Pharyngitis
Authors: Fonseca Ashley , Sunny Julee , Felipez Lina M.
Published: May 2021

Inflammatory bowel disease (IBD) that presents in children <6 years of age is known as very early-onset IBD (VEO-IBD). Extraintestinal manifestations in IBD, such as erythema nodosum (EN), pyoderma gangrenosum (PG), and, less likely, leukocytoclastic vasculitis (LV), are more commonly present in Crohn’s disease. Association between LV and ulcerative colitis (UC) is not commonly seen. We report a case of a 6-year-old female with a VEO-IBD UC phenotype presenting with multiple episodes of leukocytoclastic vasculitis, each preceded by streptococcal pharyngitis. Prior to the diagnosis of VEO-IBD, a skin biopsy was obtained and had shown leukocytoclastic vasculitis with a negative IgA stain. Initial laboratory results were remarkable for leukocytosis and increased anti-strep O and anti-DNase B titers. Gastrointestinal panel PCR demonstrated Clostridium difficile toxin A/B. Treatment for LV consisted of methylprednisolone IV 20 mg for four days with a weaning schedule of prednisolone for two weeks and naproxen 250 mg BID for three days. Clostridium difficile was treated with metronidazole 250 mg TID for ten days. She remained stable for three years until she presented with continuous bloody stools, newly onset chest pain, and shortness of breath. Computed tomography angiogram (CTA) was normal. Stool calprotectin was elevated at 658 mcg/gm. Abdominal magnetic resonance enterography (MRE), esophagogastroduodenoscopy, and colonoscopy confirmed a VEO-IBD ulcerative colitis phenotype. She was started on infliximab 10 mg/kg every four weeks after infliximab titers, and antibodies were obtained. Currently, the patient remains on clinical and biochemical remission, with no recent LV episodes or recurrence of streptococcal pharyngitis. Our patient is unique as no case report has been published with multiple episodes of leukocytoclastic vasculitis in association with a VEO-IBD UC phenotype.
Stability Assessment of Deep Three‐Soft Outburst Coal Seam Roof Based on Fuzzy Analytic Hierarchy Process
Authors: Meng Qingling , Wu Yanling , Zhang Minbo , Wang Zichao , Lei Kejiang
Published: May 2021

The stability of deep “three‐soft” coal seam roof has always been a key issue in coal mining. There are a lot of factors affecting the stability of deep three‐soft coal seam outburst roof. However, there is currently no definite method able to draw an accurate assessment conclusion on roof stability. In order to accurately determine the main influencing factors of the stability of deep three‐soft coal seam outburst roof and reduce the loss of coal production, this paper performed three‐soft coal seam risk identification on Lugou Mine based on the introduction of the fuzzy analytic hierarchy process theory. 23 main risk factors were identified. Then, it established a hierarchical structure model of coal seam roof stability in accordance with experts’ opinions. The analytic hierarchy process was used to calculate the weights of indicators at all levels. Next, the paper used the fuzzy comprehensive evaluation method and expert scoring to evaluate various risk factors in the indicator system, as well as the overall safety level. The results showed that the deep three‐soft coal seam stability of Lugou Mine ranks the third hazard level. The main risk and harmful factors include safety awareness, safety monitoring system, roof weakness, ventilation system, fire‐fighting system, and rock bolt quality. In response to the evaluation results, this paper formulated corresponding control measure in terms of ventilation risk, safety monitoring risks, construction personnel risks, and fire protection risk to reduce losses in the mining process, providing a new evaluation method for the stability assessment of deep outburst coal seam roof.
Exponential Stabilization of a Swelling Porous-Elastic System with Microtemperature Effect and Distributed Delay
Authors: Choucha Abdelbaki , Boulaaras Salah Mahmoud , Ouchenane Djamel , Cherif Bahri Belkacem , Hidan Muajebah , Abdalla Mohamed
Published: May 2021

The swelling porous thermoelastic system with the presence of temperatures, microtemperature effect, and distributed delay terms is considered. We will establish the well posedness of the system, and we prove the exponential stability result.
Multienvironment Evaluation of Tannin-Free Photoperiod-Insensitive Sorghum (Sorghum bicolor (L) Moench) for Yield and Resistance to Grain Mold in Senegal
Authors: Diatta Cyril , Sarr Mame P. , Tovignan Thierry Klanvi , Aidara Ousmane , Dzidzienyo Daniel Kwadjo , Diatta-Holgate Elisabeth , Faye Jacques Martin , Danquah Eric Yirenkyi , Offei Samuel Kwame , Cisse Ndiaga
Published: May 2021

Combining resistance to grain mold with high grain yield in tannin-free white-grained photoperiod-insensitive sorghum is of major interest for farmers in Senegal. In this study, GGE biplot analysis was used to assess the performance, adaptability, and stability of eleven sorghum parental lines and their hybrid combinations for yield and grain mold resistance under Senegalese environments. Eleven inbred lines along with their 22 hybrid combinations and one check were evaluated across three sites during the 2015 and 2016 rainy seasons under natural grain mold infestation. The results of this study showed strong genetic variability among studied genotypes for all measured traits. The highly significant G × E interaction effects for grain yield and panicle grain mold rating score (PGMR) indicated that both traits are influenced by genetics and to some extent by environment. Broad-sense heritability computed was high for all these traits except PGMR, showing a high environmental pressure on this later. The study showed that grain mold pressure in the studied sites decreased following a South-North gradient similar to the rainfall pattern, with the south region wetter, explaining the high disease pressure in Darou and Sinthiou Maleme contrary to Bambey. The GGE biplot analysis performed showed that the first two principal components explained 85.84% of the total variation of GGE sum of squares for grain yield. The which-won-where view of the GGE biplot for grain yield showed that the hybrid HB16 was the most adapted for Bambey area. The ranking of genotypes based on both yield performance and stability showed that HB16, HB5, HB21, HB18, and HB7 were the best hybrids combining high grain yield, high stability performance, and tolerance to grain mold disease across the test environments. These hybrids outperformed the best yielding inbred line P29 (2196.7 kg ha−1) with grain yield advantages ranging 17–60%. Therefore, these hybrids could be recommended to farmers in order to improve sorghum yield in Senegal.
Experimental Study on Physical‐Mechanical Properties of Expansive Soil Improved by Multiple Admixtures
Authors: Ma Binhui , Cai Kai , Zeng Xing , Li Zhuo , Hu Zhiyong , Chen Qiunan , He Chengbin , Chen Bingchu , Huang Xiaocheng
Published: May 2021

The treatment of expansive soil is always a difficult problem in engineering. Using coal gangue, fly ash, and other solid waste to treat expansive soil has gradually become a new way of energy saving and environmental protection. Most of the existing studies focus on using one or two kinds of admixtures to improve expansive soil, but there are few studies on improving expansive soil with multiple admixtures. In this paper, the expansion and shrinkage deformation and strength characteristics of expansive soil modified by coal gangue, fly ash, and lime are studied experimentally. Nine groups of different mixing schemes were designed through orthogonal tests, and the physical and mechanical properties of the improved expansive soil under different mixing ratios were tested. The sensitivity analysis of the test results was carried out to study the effect of each admixture on the improved expansive soil under different mixing ratios, and the optimal mix ratio under different conditions was obtained. The optimal mix ratio is 8% for coal gangue, 11% for fly ash, and 6% for lime. Further scanning electron microscopy (SEM) tests were carried out to analyze the microstructure of the improved expansive soil and explore the improvement mechanism of the multiadmixture. The results show that the optimal moisture content and the maximum dry density of the expansive soil with ash are decreased, and the properties of liquid plastic limit, free expansion rate, shear strength, and unconfined compressive strength of the expansive soil are improved obviously. Through the analysis of the comprehensive balance method, it is found that the content of lime has the greatest influence on the improvement effect of expansive soil, followed by that of coal gangue, and the least is that of fly ash. SEM structure analysis reveals that the particles of improved expansive soil are mainly aggregates, the soil structure is dense, particle agglomeration increases, and the overall structure is stronger. The research results can provide reference for the improvement of expansive soil with various admixtures and the resource utilization of coal gangue, fly ash, and other solid wastes.
Evaluation and Prediction Method of Rolling Bearing Performance Degradation Based on Attention‐LSTM
Authors: Wang Yaping , Yang Chaonan , Xu Di , Ge Jianghua , Cui Wei
Published: May 2021

It is significant for the evaluation and prediction of the performance degradation of rolling bearings. However, the degradation stage division of the rolling bearing performance is not obvious in traditional methods, and the prediction accuracy is low. Therefore, an Attention‐LSTM method is proposed to improve the evaluation and prediction of the performance degradation of rolling bearings. First, to reduce the uncertainty of the manual intervention, performance degradation characteristic indexes of rolling bearings are evaluated and screened by the correlation, the monotonicity, and the robustness. Second, the original characteristic indicator curve is divided into the Health Indicator (HI) curve and the residual curve by means of fixed‐window averaging to quantitatively and intuitively reflect the deterioration degree of the rolling bearing performance. Finally, the Attention mechanism is combined with the LSTM model, and a scoring function is established to enhance the prediction accuracy. The scoring function is used to adjust the intermediate output state weight of the LSTM model and improve the prediction accuracy. The appropriate network structure and the parameter configuration are determined, and the prediction model of rolling bearing degradation performance is established. Compared with other models, the method proposed by this paper makes full use of the historical data and is more sensitive to the key information in the long time series, and the eRMSE index and the eMAE index of the two sets of experimental data are minimum, and the prediction accuracy of rolling bearing degradation performance is higher. The model has the strong robustness and the generalization ability, which has the important engineering practical value for the prediction of the equipment health state.
Energy Dissipation and Damage Evolution Characteristics of Salt Rock under Uniaxial Cyclic Loading and Unloading Tension
Authors: Zhu Anqi , Liu Jianfeng , Wu Zhide , Wang Lu , Liu Hejuan , Xiao Fukun , Deng Chaofu
Published: May 2021

Salt rock has been regarded as the optimal surrounding rock for underground gas storage (UGS), and it is occasionally subjected to cyclic tension because of the gas injection and production of salt cavern, which leads to the change in mechanical properties of salt rock. In this paper, a laboratory study is conducted to investigate the energy dissipation and damage evolution characteristics of salt rock under uniaxial cyclic tension monitored by acoustic emission (AE) machine. Compared to monotonic tension, both tensile strength and deformation capacity of salt rock are enhanced under cyclic tension. The fracture crack is approximately a single linear crack with large elliptical plastic deformation zone, which is consistent with the spatial distribution of AE events. In yield stage, the proportion of dissipative energy increases first but decreases subsequently. The relationship between AE energy‐based damage variable and displacement is established. It is concluded that the damage variable is a piecewise power correlation with displacement while the growth rate of damage variable increases in the pre‐peak stage but decreases in post‐peak stage.
Optimum Path Tracking Control for the Inverse Problem of Vehicle Handling Dynamics Based on the hp-Adaptive Gaussian Pseudospectral Method
Authors: Liu Yingjie , Sun Yongli , Cui Dawei
Published: May 2021

We propose a vehicle path-tracking method based on the hp-adaptive Gaussian pseudospectral method (GPM), which tackles the problem of the slow convergence speed of the optimal control of vehicle path tracking. First, we establish a kinematic vehicle model by considering the path constraints and boundary constraints during the process of tracking the described path of a vehicle. Subsequently, finding the minimum error of the lateral distance between the prescribed path and the expected trajectory is set as the performance objective function. Finally, the vehicle path tracking problem is transformed into an optimal control problem. The optimization algorithm is combined with the sequential quadratic programming algorithm to optimize problems related to the control and state variables and the boundary and path constraints. The simulated results show that the hp-adaptive GPM can improve the convergence rate of the optimal control problem for vehicle path tracking. The proposed hp-adaptive pseudospectral method has a higher solving efficiency compared with traditional approaches for the vehicle path-tracking problem. Concurrently, the verification results of a real vehicle test indicate the feasibility of the proposed algorithm for solving the vehicle path tracking problem. This research provides valuable insight into the design work of lane changes and is an important step towards the design of feedback control laws for path tracking.
A Decentralized ETC Architecture Based on Blockchain Technology
Authors: Huang Shize , Yang Lingyu , Yang Xiaolu , Li Xinghua , Gao Fei
Published: May 2021

Electronic toll collection (ETC) has been widely spread in China, providing efficient, comfortable, and convenient toll services. However, the nature of centralization of those ETC systems has incurred serious security threatens. Given blockchain’s features of self-trust, decentralized architecture, and traceability, we propose a decentralized ETC architecture based on blockchain technology. After implementing our architecture in a test network, we verify its feasibility. A thorough discussion indicates that our architecture can effectively operate normal ETC services while avoiding most attacks that threaten traditional ETC systems. The proposed architecture provides a brand new way of conventional ETC system optimization.
Analytical and Numerical Study of the Ground Pressure of the Work Face Crossing the Fault
Authors: Gao Yanan , Zhang Yudong , Lan Donghao , Gao Feng
Published: May 2021

The excavation of coal mine often encounters the fault problem. In this paper, the analytical study of the pressure of the fault that the work face may cross is carried out. The evolution of the stress and moment of the fault is investigated. Afterwards, a numerical study is performed. The stress and displacement of the rock mass near the work face and the fault are calculated under each situation (the initial fracture and periodical fracture of the immediate roof, the forward direction fault, and the reverse direction fault), and the changes in the contact pressure and stress near the fault during the excavation are analyzed. The effect of searching tunnel on the mining pressure is also studied. The calculation results indicate that although the searching‐tunnel can decrease the stress at the roof of the fault (reverse direction fault), it may increase the stress at other positions. It can therefore be concluded that, for the forward direction fault, the effect of the searching tunnel to decrease the contact pressure and dissipate the energy is limited; on the contrary, it will aggravate the fragmentation degree and make the support more difficult, while, for the reverse direction fault, the excavation of searching tunnel can not only provide a better understanding of the characters of the fault but also have a positive effect on the ground control.
New Operators of Cubic Picture Fuzzy Information with Applications
Authors: Tehreem  , Gumaei Abdu , Hussain Amjad
Published: May 2021

The researcher has been facing problems while handling imprecise and vague information, i.e., the problems of networking, decision-making, etc. For encountering such complicated data, the notion of fuzzy sets (FS) has been considered an influential tool. The notion was extended to its generalizations by a number of researchers in different ways which helps to understand and assess even more complex issues. This article characterizes imprecision with four kinds of values of membership. In this work, we aim to define and examine cubic picture fuzzy sets and give an application on averaging aggregation operators. We first introduce the notion of a cubic picture fuzzy set, which is a pair of interval-valued picture fuzzy set and a picture fuzzy set by giving examples. Then, we define two kinds of ordering on these sets and also discuss some set-theoretical properties. Moreover, we introduce three kinds of averaging aggregation operators based on cubic picture fuzzy sets and, at the end, we illustrate the results with a decision-making problem by using one of the provided aggregation operators.
Comida de Coro: de Gracias, señor à Uzyna Uzona
Authors: Ramos Luiz Fernando
Published: May 2021

Gracias, señor, o mítico espetáculo de 1971 do Teatro Oficina, sempre foi compreendido, na história do teatro brasileiro, como um ponto fora da curva que teria provocado uma profunda crise no grupo, levando ao seu desmanche. Este artigo recusa essa tese, projetando o espetáculo como a semente que germinará, duas décadas depois, na constituição e trajetória vitoriosa da Uzyna Uzona. Desencadeador do processo de radicalização política e estética (que alcançou seu ápice na revolução portuguesa de 1974) e implicou no desfazimento do coletivo original, Gracias, señor, sugere-se aqui, cria as fundações daquilo que foi produzido nos três últimos decênios. De fato, o atual Teatro Oficina Uzyna Uzona é a realização acabada da utopia que aquela experiência projetou e que décadas de maturação conseguiram engendrar.
ZÉ, o homem político em cena
Authors: Mostaço Edélcio
Published: May 2021

O texto enfoca as dimensões políticas que perpassam a figura de Zé Celso Martinez Corrêa, encenador brasileiro e líder do Teatro Oficina. Desde suas origens marcadas pelo existencialismo até as condutas derivadas de sua concepção de tragicomediorgya, essa trajetória se mostra fortemente marcada pelas suas participações políticas e postura cidadã.
Oficina de florestas: Tupi or not Tupi, that is the question
Authors: Gonçalves Luiz Davi Vieira
Published: May 2021

Este artigo apresenta uma reflexão acerca da dimensão do teatro e os povos indígenas. Com um olhar expandido sobre a cena teatral brasileira, traz os trabalhos desenvolvidos pelo grupo de pesquisa Tabihuni, da cidade de Manaus, e pela companhia de teatro Oficina Uzyna Uzona, da cidade de São Paulo. O primeiro destaca-se pela participação direta dos indígenas nas performances Uwanary tendawa e Ühpü; o segundo, pela presença cênica vital dos envolvidos, elenco e público, no espetáculo Os sertões.
Notas sobre a história do Oficina
Authors: Fernandes Sílvia
Published: May 2021

O texto comenta alguns marcos da história do Teatro Oficina Uzyna Uzona até a encenação do ciclo Os Sertões, a partir da ênfase na trajetória de José Celso Martinez Corrêa, do coro e da relação com a cidade.
Práticas e desafios para a terapia ocupacional no contexto da intervenção precoce
Authors: Marini Bruna Pereira Ricci , Della Barba Patrícia Carla de Souza
Published: May 2021

Objetivos: analisar as práticas implementadas por terapeutas ocupacionais atuantes em serviços de Intervenção Precoce destinados a crianças entre zero e cinco anos e apontar os desafios enfrentados por esses profissionais durante a estruturação de suas ações. Procedimentos metodológicos: Trata-se de um estudo transversal, descritivo e exploratório, de abordagem qualitativa. Participaram quatro terapeutas ocupacionais vinculados a serviços localizados em municípios do interior e litoral do estado de São Paulo. A coleta de dados foi realizada mediante entrevistas semiestruturadas e a análise dos dados foi feita sob a perspectiva da Análise de Conteúdo, na modalidade de análise temática. Resultados: Os resultados do estudo, foram classificados em quatro núcleos temáticos, sendo eles: Práticas no contexto da Intervenção Precoce, O objeto da intervenção, Fundamentação para atuar e Desafios para a Terapia Ocupacional em Intervenção Precoce. Conclusões: Conclui-se que práticas desenvolvidas têm se estruturado sob referenciais predominantemente reabilitativos e pautados nas necessidades das crianças atendidas, o que impacta a identidade das ações. Assim, os principais encontram-se relacionados às características dos serviços, formação profissional e ao delineamento do um modelo de prática.
Avaliação da incapacidade e saúde de pacientes com doença renal crônica submetidos a hemodiálise
Authors: Hungria Thatyane Cruvinel Silva , Azevedo Gustavo Silva de , Campos Amanda Rafaella Araujo de , Duarte Amélia Stival
Published: May 2021

Introdução: A doença renal crônica (DRC) corresponde à redução irreversível da função renal, provoca um grande impacto para a pessoa acometida e suas funcionalidades básicas ficam prejudicadas, resultando em mudanças importantes no seu estilo de vida1. Objetivo: Avaliar o grau de incapacidade e saúde de pacientes com doença renal crônica submetidos à hemodiálise. Metodologia: Trata-se de um estudo de campo, do tipo transversal, com amostra de conveniência, para a avaliação sociodemográfica, clínico funcionais e de desempenho funcional dos pacientes DRC correlacionados ao questionário Word Health Organization Disability Assessment Schedule – WHODAS versão 2.0. Resultados: Os participantes do estudo (n= 59), com predominância de homens (67,79%), e média de idade de 51,75± 00 anos, apresentaram comorbidades associadas à DRC, tendo destaque para hipertensão arterial sistêmica (67,79%) e diabetes mellitus (33,89%). A mobilidade dos pacientes mensuradas pelo Time Up and Go – TUG teste possuiu correlação com o WHODAS nos domínios de: cognição, mobilidade, autocuidado e participação. Houve correlação inversamente proporcional entre a força de preensão palmar e os domínios de mobilidade, autocuidado e atividades domésticas. O grau de dor verificado pela escala EVA teve representatividade junto aos domínios de cognição, mobilidade, autocuidado, relaçõesinterpessoais, participação e atividades domésticas. Conclusão: Verifica-se os amplos prejuízos na funcionalidade de pacientes hemodialíticos; e a Fisioterapia, por dispor de vários recursos de avaliação e intervenção, poderá amenizar a incapacidade e favorecer a saúde dessa população.
Confecção de um dispositivo ortotico dinâmico de baixo custo para indivíduos com sequelas medulares de C6 e C7: nova forma de assistência no desempenho das atividades de vida diária
Authors: Silva Izabela Oliveira da , Dias Lorena Henriete Araújo , Silva Maria Vitória Oliveira da , Rodrigues Junior Jorge Lopes
Published: May 2021

A lesão medular apresenta variadas etiologias, atingem principalmente indivíduos do sexo masculino na faixa etária de alta produtividade, ocasionando danos de grau motores, psicológico e sociais. Dessa forma, as Tecnologias Assistivas contribuem para uma execução satisfatória das ocupações e autocuidado. Dentre elas, as órteses, agindo como auxilio ao método de reabilitação, pois contribuem e colaboram na utilização funcional do segmento lesado. O estudo objetivou a confecção de um dispositivo ortotico dinâmico para assistência de indivíduos com sequelas medulares em altura de cervical 6 e 7. A pesquisa tem caráter exploratório do tipo qualitativo, sendo realizada no laboratório de uma universidade pública da região norte. O processo de fabricação ocorreu em 5 fases, resultando em um protótipo de baixo custo resistente a força aplicada, testado em polímeros de policloreto de vinila e fibra sintética de carbono com resina epóxi. Priorizou-se o designer para o dispositivo, seguindo os critérios anatômicos e biomecânicos de movimentação da mão, e assim facilitando suas pressões e pinças. Ponderou-se que a função do dispositivo é diretamente favorecida pela variabilidade dos materiais, e seu acionamento é dado pela tenodese quando ativo e pela mola quando passivo.
Função sensorial em membros superiores e atividades funcionais de indivíduos pós AVC
Authors: Reis Jamine Cunha dos , Cruz Maria Soraida Silva , Caldas Ada Salvetti Cavalcanti
Published: May 2021

O Acidente Vascular Cerebral é uma patologia incapacitante e tem alto índice de morbimortalidade no Brasil. Essa condição pode gerar um impacto na homeostase das funções motoras e sensoriais. São necessários mais estudos de reabilitação com essa população visto que há lacunas no que se refere à descrição das intervenções e orientações específicas para a função sensorial. Diante disto, objetivou-se relacionar a função sensorial com a função motora e a capacidade funcional de indivíduos após AVC. Foram utilizadas a Avaliação Sensorial de Nottingham, Medida de Independência Funcional e Escala Fugl Meyer. A amostra foi composta por 35 voluntários sendo observados que quanto maior a pontuação na função sensorial melhor seria o desempenho nas funções motoras. Ao associar a função sensorial, o desempenho motor e as atividades funcionais os sujeitos necessitavam de supervisão; foram mais independentes os que apresentaram os itens “toque” e “pressão” considerados como normais. Conclui-se que houve alterações das funções somatossensoriais e motoras que geraram impacto nas atividades funcionais.