bluuebunny/crossref_metadata_2025 huggingface dataset:
Gaining Insight from Semi-Variograms into Machine Learning Performance of Rock Domains at a Copper Mine
Authors: Sarantsatsral Narmandakh , Ganguli Rajive
Published: August 2022

Machine learning (ML) is increasingly being leveraged by the mining industry to understand how rock properties vary at a mine site. In previously published work, the rock type, granodiorite, was predicted with high accuracy by the random forest (RF) ML method at the Erdenet copper mine in Mongolia. As a result of the optimistic results (86% overall success rate), this paper extended the research to determine if ML would be successful in modeling rock domains. Rock domains are groups of rocks that occur together. There were two additional goals. One was to determine if the variograms could predict or help understand how ML methods would perform on the data. The second was to determine if 2D modeling would perform well given the disseminated nature of the deposit. ML methods, multilayer perceptron (MLP), k-nearest neighborhood (KNN) and RF, were applied to model six rock domains, D0–D5, in 2D and 3D. Modeling performance was poor in 2D. Prediction performance accuracy was high in 3D for the domains D1 (92–94%), D2 (94–96%) and D4 (85–98%). Note that the domains D1 and D2 together constituted about 80% of the samples. Conclusions drawn in this paper are based on the results of 3D modeling since 2D modeling performance was poor. Prediction performance appeared to depend on two factors. It was better for a domain when the domain was not a minuscule proportion of the sample. It was also better for domains whose indicator semi-variogram (ISV) range was high. For example, though D4 only contributed 15% of the samples, the range was high. MLP did not perform as well as KNN and RF, with RF performing the best. The hyperparameters of KNN and RF suggested that performance was best when only a small number of samples were used to make a prediction. One overall summary conclusion is that the two most important domains, D1 and D2, could be predicted with high accuracy using ML. The second summary conclusion is that semi-variograms can provide insight into ML performance.
Age, Genesis and Tectonic Setting of the Sayashk Tin Deposit in the East Junggar Region: Constraints from Lu–Hf Isotopes, Zircon U–Pb and Molybdenite Re–Os Dating
Authors: Sun Zhenjun , Liu Guanghu , Ren Yunsheng , Chen Xi , Sun Xinhao , Wang Chengyang , Li Zuowu
Published: August 2022

The Sayashk tin (Sn) deposit is located within the southern part of the Eastern Junggar orogenic belt in Xinjiang Province and forms part of the Kalamaili alkaline granite belt. There are many Sn polymetallic deposits in the area. To constrain the age, genesis, and tectonic setting of the Sayashk tin deposit in the East Junggar region, we conducted a bulk-rock geochemical analysis of the granite porphyry (SR1) and medium- to fine-grained granite (SR2) hosts of the deposit, LA-ICP-MS zircon U–Pb dating and Lu–Hf isotopic analysis, as well as molybdenite Re–OS dating and combined our results with the metallogenic conditions and other geological characteristics of the deposit. The results show that the Sayashk Sn deposit is indeed spatially, temporally, and genetically closely related to the granite porphyry and medium-fine-grained granite. Both zircon U–Pb ages are 308.2 ± 1.5 Ma and 310.9 ± 1.5 Ma, respectively. The isochron age of molybdenite is 301.4 ± 6.7 Ma, which represents the crystallization age of the granite porphyry and medium-fine-grained granite. Therefore, all of them formed in the late Carboniferous epoch. The medium-fine-grained granites and granite porphyry are characteristically rich in Si and alkali, poor in Ca and Mg, rich in high field-strength elements (HFSE, e.g., Zr, Hf) and Ce, and deficient in Ba, Sr, Eu, P, and Ti. They are typical A-type granites, showing the characteristics of a mixed crustal mantle source. The εHf(t) values of the zircon from the granite porphyry (SR1) range from 10.27 to 16.17 (average 13.71), εHf(t) values of the zircon from the medium-fine-grained granites (SR2) are between 5.72 and 9.21 (average 7.08), and the single model ages (TDM1) and two-stage model ages (TDM2) of the granite porphyry (SR1) fall within the ranges of 319~535 Ma and 339~644 Ma. The single model ages (TDM1) and two-stage model ages (TDM2) of the medium-fine-grained granites (SR2) fall within the ranges of 346~479 Ma and 309~557 Ma. There is little difference between their two-stage model ages and zircon U–Pb ages, indicating that the Sayashk granite may be the product of partial melting of juvenile crustal. Combined with previous research results, the Sayashk Sn deposit formed in a post-collision extensional tectonic setting after the late Carboniferous in the Kalamaili area.
Mechanical Properties and Antibacterial Effect on Mono-Strain of Streptococcus mutans of Orthodontic Cements Reinforced with Chlorhexidine-Modified Nanotubes
Authors: Salmerón-Valdés Elias Nahum , Cruz-Mondragón Ana Cecilia , Toral-Rizo Víctor Hugo , Jiménez-Rojas Leticia Verónica , Correa-Prado Rodrigo , Lara-Carrillo Edith , Morales-Valenzuela Adriana Alejandra , Scougall-Vilchis Rogelio José , López-Flores Alejandra Itzel , Hoz-Rodriguez Lia , Velásquez-Enríquez Ulises
Published: August 2022

Recently, several studies have introduced nanotechnology into the area of dental materials with the aim of improving their properties. The objective of this study is to determine the antibacterial and mechanical properties of type I glass ionomers reinforced with halloysite nanotubes modified with 2% chlorhexidine at concentrations of 5% and 10% relative to the total weight of the powder used to construct each sample. Regarding antibacterial effect, 200 samples were established and distributed into four experimental groups and six control groups (4 +ve and 2 −ve), with 20 samples each. The mechanical properties were evaluated in 270 samples, assessing microhardness (30 samples), compressive strength (120 samples), and setting time (120 samples). The groups were characterized by scanning electron microscopy and Fourier transform infrared spectroscopy, and the antibacterial activity of the ionomers was evaluated on Streptococcus mutans for 24 h. The control and positive control groups showed no antibacterial effect, while the experimental group with 5% concentration showed a zone of growth inhibition between 11.35 mm and 11.45 mm, and the group with 10% concentration showed a zone of growth inhibition between 12.50 mm and 13.20 mm. Statistical differences were observed between the experimental groups with 5% and 10% nanotubes. Regarding the mechanical properties, microhardness, and setting time, no statistical difference was found when compared with control groups, while compressive strength showed higher significant values, with ionomers modified with 10% concentration of nanotubes resulting in better compressive strength values. The incorporation of nanotubes at concentrations of 5% and 10% effectively inhibited the presence of S. mutans, particularly when the dose–response relationship was taken into account, with the advantage of maintaining and improving their mechanical properties.
Synthesis of Aluminum Phosphate-Coated Halloysite Nanotubes: Effects on Morphological, Mechanical, and Rheological Properties of PEO/PBAT Blends
Authors: Wang Kui , Jin Xuefei , He Xiuhong , Huang Weijiang , Tian Qin , Fu Qiuping , Yan Wei
Published: August 2022

Polymer blending has been widely used to fabricate polymeric films in the last decade due to its superior properties to a single component. In this study, an aluminum phosphate-coated halloysite nanotube (HNTs@AlPO4) was fabricated using a one-pot heterogeneous precipitation method, organically modified HNTs@AlPO4 (o-HNTs@AlPO4) was used to improve the performance of polyethylene oxide/poly(butylene adipate-co-terephthalate) (PEO/PBAT) blends, and the mechanical and rheological properties of the PEO/PBAT/o-HNTs@AlPO4 films were systematically discussed. According to our results, there is an optimal addition for adequate AlPO4 nanoparticle dispersion and coating on the surface of HNTs, and organic modification could improve the interfacial compatibility of HNTs@AlPO4 and the polymeric matrix. Moreover, o-HNTs@AlPO4 may serve as a compatibilizer between PEO and PBAT, and PEO/PBAT/o-HNTs@AlPO4 films have better mechanical and rheological properties than the PEO/PBAT blends without the o-HNTs@AlPO4 component.
On Time-Dependent Rheology of Sutterby Nanofluid Transport across a Rotating Cone with Anisotropic Slip Constraints and Bioconvection
Authors: Abdal Sohaib , Siddique Imran , Abualnaja Khadijah M. , Afzal Saima , Jaradat Mohammed M. M. , Mustafa Zead , Ali Hafiz Muhammad
Published: August 2022

The purpose and novelty of our study include the scrutinization of the unsteady flow and heat characteristics of the unsteady Sutterby nano-fluid flow across an elongated cone using slip boundary conditions. The bioconvection of gyrotactic micro-organisms, Cattaneo–Christov, and thermal radiative fluxes with magnetic fields are significant physical aspects of the study. Anisotropic constraints on the cone surface are taken into account. The leading formulation is transmuted into ordinary differential formate via similarity functions. Five coupled equations with nonlinear terms are resolved numerically through the utilization of a MATLAB code for the Runge–Kutta procedure. The parameters of buoyancy ratio, the porosity of medium, and bioconvection Rayleigh number decrease x-direction velocity. The slip parameter retard y-direction velocity. The temperature for Sutterby fluids is at a hotter level, but its velocity is vividly slower compared to those of nanofluids. The temperature profile improves directly with thermophoresis, v-velocity slip, and random motion of nanoentities.
Laser Synthesis of Nanomaterials
Authors: Larosi Mohamed Boutinguiza , García Jesús del Val , Rodríguez Antonio Riveiro
Published: August 2022

Nanomaterials, defined as materials with typical dimensions of less than 100 nm in at least one dimension, exhibit very special physicochemical properties that are highly dependent on their size and shape [...]
You Are What You Eat… But Do You Eat What You Are? The Role of Identity in Eating Behaviors—A Scoping Review
Authors: Gerber Suzannah , Folta Sara C.
Published: August 2022

Background: Identity is a major construct in the fields of psychology and anthropology that can relate to both the maintenance of eating behaviors and cultural sensitivity. However, there has not been any systematic effort to understand the role of identity in eating behaviors and the maintenance of eating behaviors, or to address multiple aspects of identity within an individual across scientific disciplines. This scoping review aims to understand and describe existing research relating identity to eating behaviors and to detail the measurement of identity. Methods: We conducted a systematic search of Ovid, PsychINFO, Embase, and Web of Science for articles on identity and eating behaviors published between January 1946 and March 2022. We utilized the Preferred Reporting Items for Systematic reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR) checklist, and search methods were developed with the assistance of a research librarian. We rated articles from 1 to 5 based on the depth, complexity, and multi-dimensionality of the identity measurement conducted. Scoring criteria included a review of the number of items directly querying or evaluating identity and the extent of measurement of identity domains. Results: In total, 100 articles were included, examining 10 different identities, 8 identity constructs, 11 eating behaviors, and construct contributions from 26 theories. The mean score of all articles was 2.9 on the scale from 1 to 5. A total of 10 studies scored a “1”; 30 scored a “2”, indicating the use of 1–2 basic questions about identity; 31 received a “3” for use of a common but non-complex identity instrument; 19 received a “4”, meaning they contained strong evaluation and included multiple types of identity but were lacking in terms of depth of measure and/or the comparison of identity effects to constructs; and 10 scored a “5” for their strong, in-depth measure of identity and inclusion of multiple types. Identity was found to be significantly related to eating behaviors in all but one study. Conclusion: Identity measurements seldom accounted for complexities such as multiple identities and identity shifting over time. Nonetheless, our findings indicate that multiple aspects of identity reciprocally reinforce behavior and that change maintenance is associated with identity salience and centrality. Identity is underutilized and heterogeneously applied in eating behavior research. The inclusion of identity assessments may lead to better outcomes being obtained within differing cultural, normative, and environmental scenarios.
Haemonchus contortus Parasitism in Intensively Managed Cross-Limousin Beef Calves: Effects on Feed Conversion and Carcass Characteristics and Potential Associations with Climatic Conditions
Authors: Arsenopoulos Konstantinos V. , Katsarou Eleni I. , Mendoza Roldan Jairo A. , Fthenakis George C. , Papadopoulos Elias
Published: August 2022

The objectives of the study were: (a) to study the effect of Haemonchus spp. on the growth performance characteristics of fattening calves, (b) to assess any potential effects on carcass characteristics and (c) to investigate the potential role of climatic conditions in the process of the infection. The study was conducted for 201 days in an intensively managed cross-Limousin herd. The animals were divided into two equal groups: those receiving anthelmintic treatment (AT) and the untreated (C) controls. The same nutritional regime was applied to both groups and the feed consumption was calculated daily. Standard parasitological examinations were performed at weekly intervals. At slaughter, carcasses were weighed and assessed for conformation and fat cover classes. Climatic variables were obtained for the location of the farm and a temperature-humidity index was calculated. Before anthelmintic treatment with ivermectin, there was no difference in parasitic burdens between the two groups: 544 (AT) vs. 554 (C) epg, whilst after it, counts were 0 and 450–700 epg, respectively, with over 96% of larvae identified as Haemonchus spp. and, later, confirmed as Haemonchus contortus. It was concluded that treated animals had a higher average total bodyweight gain, higher feed conversion ratio and carcass yield of superior quality than controls. There was a difference between the two groups in the pattern of reduction of dry matter intake as the temperature-humidity index increased.
Current Topics in Dermatophyte Classification and Clinical Diagnosis
Authors: Moskaluk Alex E. , VandeWoude Sue
Published: August 2022

Dermatophytes are highly infectious fungi that cause superficial infections in keratinized tissues in humans and animals. This group of fungi is defined by their ability to digest keratin and encompasses a wide range of species. Classification of many of these species has recently changed due to genetic analysis, potentially affecting clinical diagnosis and disease management. In this review, we discuss dermatophyte classification including name changes for medically important species, current and potential diagnostic techniques for detecting dermatophytes, and an in-depth review of Microsporum canis, a prevalent zoonotic dermatophyte. Fungal culture is still considered the “gold standard” for diagnosing dermatophytosis; however, modern molecular assays have overcome the main disadvantages of culture, allowing for tandem use with cultures. Further investigation into novel molecular assays for dermatophytosis is critical, especially for high-density populations where rapid diagnosis is essential for outbreak prevention. A frequently encountered dermatophyte in clinical settings is M. canis, which causes dermatophytosis in humans and cats. M. canis is adapting to its primary host (cats) as one of its mating types (MAT1-2) appears to be going extinct, leading to a loss of sexual reproduction. Investigating M. canis strains around the world can help elucidate the evolutionary trajectory of this fungi.
Isosteviol Sodium (STVNA) Reduces Pro-Inflammatory Cytokine IL-6 and GM-CSF in an In Vitro Murine Stroke Model of the Blood–Brain Barrier (BBB)
Authors: Reschke Moritz , Salvador Ellaine , Schlegel Nicolas , Burek Malgorzata , Karnati Srikanth , Wunder Christian , Förster Carola Y.
Published: August 2022

Early treatment with glucocorticoids could help reduce both cytotoxic and vasogenic edema, leading to improved clinical outcome after stroke. In our previous study, isosteviol sodium (STVNA) demonstrated neuroprotective effects in an in vitro stroke model, which utilizes oxygen-glucose deprivation (OGD). Herein, we tested the hypothesis that STVNA can activate glucocorticoid receptor (GR) transcriptional activity in brain microvascular endothelial cells (BMECs) as previously published for T cells. STVNA exhibited no effects on transcriptional activation of the glucocorticoid receptor, contrary to previous reports in Jurkat cells. However, similar to dexamethasone, STVNA inhibited inflammatory marker IL-6 as well as granulocyte-macrophage colony-stimulating factor (GM-CSF) secretion. Based on these results, STVNA proves to be beneficial as a possible prevention and treatment modality for brain ischemia-reperfusion injury-induced blood–brain barrier (BBB) dysfunction.
Intra-Ocular Pressure Response to Dexamethasone Implant Injections in Patients with a History of Filtering Surgery: The TRABEX Study
Authors: Rezkallah Amina , Kodjikian Laurent , Barbarroux Aymeric , Laventure Corentin , Motreff Antoine , Chacun Samuel , Matonti Frédéric , Denis Philippe , Mathis Thibaud
Published: August 2022

Patients with both macular edemas, of various etiologies such as diabetes and glaucoma, may suffer serious loss of vision if either disease goes untreated. Where no effective alternative therapies are available, dexamethasone implant (DEX-I) injections may be the only choice of treatment, despite the risk of a possible increase in intraocular pressure (IOP) when using steroids. Although many studies have reported on IOP evolution in eyes treated with DEX-I, little is known specifically about eyes with a history of filtering surgery. The aim of this observational series was to evaluate the IOP response following DEX-I injection in eyes presenting conventional filtering surgeries or microinvasive glaucoma surgeries (MIGS). Twenty-five eyes were included in this study. A total of 64% of the eyes did not experience OHT during follow-up. Additional IOP-lowering therapy was needed for 32% of eyes, and 20% of eyes (all showing bleb fibrosis) required further filtering surgery: 50% of eyes in the MIGS group and 10.5% of eyes in the conventional filtering surgery group. A significant positive correlation was found between IOP at baseline and the maximum IOP throughout follow-ups after DEX-I (r = 0.45, p = 0.02). In conclusion, if DEX-I is used when there are no alternative therapies for treating macular edema, IOP in eyes with a history of filtering surgery is generally manageable. Those eyes which previously underwent conventional therapy with effective blebs obtained better IOP control after DEX-I injections and mostly did not require any additional IOP-lowering therapy or surgery.
State-of-the-Art and Opportunities for Bioactive Pentacyclic Triterpenes from Native Mexican Plants
Authors: Alfaro-Almaguer Juan Antonio , Mejía-Manzano Luis Alberto , González-Valdez José
Published: August 2022

Native Mexican plants are a wide source of bioactive compounds such as pentacyclic triterpenes. Pentacyclic triterpenes biosynthesized through the mevalonate (MVA) and the 2-C-methyl-D-erythritol-phosphate (MEP) metabolic pathways are highlighted by their diverse biological activity. Compounds belonging to the oleanane, ursane, and lupane groups have been identified in about 33 Mexican plants, located geographically in the southwest of Mexico. The works addressing these findings have reported 45 compounds that mainly show antimicrobial activity, followed by anti-inflammatory, cytotoxic, anxiolytic, hypoglycemic, and growth-stimulating or allelopathic activities. Extraction by maceration and Soxhlet with organic solvents and consecutive chromatography of silica gel have been used for their whole or partial purification. Nanoparticles and nanoemulsions are the vehicles used in Mexican formulations for drug delivery of the pentacyclic triterpenes until now. Sustainable extraction, formulation, regulation, isolation, characterization, and bioassay facilities are areas of opportunity in pentacyclic triterpenes research in Mexico while the presence of plant and human resources and traditional knowledge are strengths. The present review discusses the generalities of the pentacyclic triterpene (definition, biogenic classification, and biosynthesis), a summary of the last two decades of research on the compounds identified and their evaluated bioactivity, the generalities about the extraction and purification methods used, drug delivery aspects, and a critical analysis of the advantages and limitations of research carried out in this way.
Double-Network Polymer Electrolytes with Ionic Liquids for Lithium Metal Batteries
Authors: Zhu Chenjing , Ning Yi , Jiang Yizhi , Li Guangji , Pan Qiwei
Published: August 2022

Solid-state polymer electrolytes have become promising candidates for high-energy-density lithium metal batteries (LMBs). However, they suffer from low ionic conductivities at room temperature. In this work, two types of composite polymer electrolytes based on a double-network polymer, an ionic liquid (IL) of 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide (Pyr14TFSI) or 1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl) imide (EmimTFSI), and bis(trifluoromethane)sulfonamide lithium salt (LiTFSI) were prepared by a facile one-pot method. The two types of CPEs possess good mechanical properties, excellent thermal stability, and high ionic conductivities greater than 10−4 S cm−1 at 20 °C with 26 wt% IL. The performance diversity of the CPEs was also carefully investigated through a series of electrochemical measurements. Although the CPEs containing EmimTFSI show higher ionic conductivities than those of CPEs with Pyr14TFSI, the latter ones have wider electrochemical stability windows and better resistance to the growth of lithium dendrites. Moreover, CPE with 34 wt% Pyr14TFSI leads to Li/LiFePO4 batteries with favorable rate capability and cycling stability and a columbic efficiency of 98.8% at 20 °C, which suggests that CPEs are promising for practical application in solid-state LMBs.
Effect of Temperature on Mechanical Behavior of Concrete Reinforced with Different Types of GFRP Bar
Authors: de Araújo Moura Ruan Carlos , Lima Paulo Roberto Lopes , Ribeiro Daniel Véras
Published: August 2022

Glass fiber reinforced polymer (GFRP) bars have been increasingly used as reinforcement in concrete structures. However, when the bars are exposed to high temperatures, there is a change in the internal structure of the polymer which affects the tensile strength of the matrix and its adhesion with the fibers, reducing the mechanical strength of the bar. In addition, with increasing temperature, the bar-concrete interface is also damaged by the decomposition of hydration products from the cement paste and the loss of surface adhesion. The intensity of these changes is associated with the type of resin used as a matrix since each polymer has its own molecular structure that provides a greater or lesser ability to resist the changes imposed by temperature. The present study evaluates the mechanical behavior of reinforced concrete containing different types of GFRP bars and subjected to temperatures of 150 °C, 300 °C, and 350 °C. The GFRP bars with three types of matrices (polyester, vinyl ester, or epoxy) were mechanically evaluated under tension in two conditions: isolated and inserted into reinforced concrete specimens with a thickness of 20 mm, using two types of concrete (with and without silica fume). Degradation mechanisms at the bar/concrete interface were evaluated using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), differential thermal analysis (DTA), and bond techniques. The results showed that the type of matrix has a significant influence on the tensile behavior of GFRP bars, with the epoxy matrix showing the best performance, followed by bars with vinyl ester and polyester matrix resins. The use of silica fume improved the performance of the concrete coating and, consequently, improved the protection of GFRP bars, hindering the diffusion of oxygen and heat; bar/concrete adhesion was compromised by thermal degradation of GFRP bar ribs.
Dynamic Changes and Driving Forces of Alpine Wetlands on the Qinghai–Tibetan Plateau Based on Long-Term Time Series Satellite Data: A Case Study in the Gansu Maqu Wetlands
Authors: Zhang Bo , Niu Zhenguo , Zhang Dongqi , Huo Xuanlin
Published: August 2022

The Qinghai–Tibet Plateau (QTP), also known as the Third Pole of the Earth, is sensitive to climate change, and it has become a hotspot area for research. As a typical natural ecosystem on the QTP, alpine wetlands are particularly sensitive to climate change. The identification of different types of alpine wetland and analysis of changes in their distributions and areas are the most direct indicators for characterizing the impact of climate change on wetlands. To understand the dynamic change process of the alpine wetlands in the QTP and their responses to climate change, the Maqu wetlands, located at the source of the Three Rivers in the eastern part of the QTP, was taken as an example; the Google Earth Engine (GEE) remote sensing cloud platform and long-term dense Landsat time series data from 1990 to 2020 were used to map the annual wetland classification and to analyze the evolution characteristics of the wetlands and their driving forces. The results revealed that (1) based on dense Landsat time series data, different alpine wetland types can be effectively distinguished, including swamp, swamp meadow, and wet meadow. (2) From 1990 to 2020, the area of the Maqu wetlands exhibited an overall fluctuating decrease, with the total area decreasing by about 23.35%, among which the swamp area decreased the most (by 27.15%). The overall type of change was from wet to dry. All of the types of wetlands were concentrated between 3400 and 3600 m above sea level, and the reduction in the wetland area was concentrated on slopes < 3°, with the greatest loss of wetland area occurring on shady slopes. (3) The driving forces of the changes in the wetlands were predominantly temperature and precipitation, and the greatest correlation was between the total wetland area and the growing season temperature. The results of this study provide valuable information for the conservation of alpine wetlands.
A Systematic Review of Sensor Fusion Methods Using Peripheral Bio-Signals for Human Intention Decoding
Authors: Dwivedi Anany , Groll Helen , Beckerle Philipp
Published: August 2022

Humans learn about the environment by interacting with it. With an increasing use of computer and virtual applications as well as robotic and prosthetic devices, there is a need for intuitive interfaces that allow the user to have an embodied interaction with the devices they are controlling. Muscle–machine interfaces can provide an intuitive solution by decoding human intentions utilizing myoelectric activations. There are several different methods that can be utilized to develop MuMIs, such as electromyography, ultrasonography, mechanomyography, and near-infrared spectroscopy. In this paper, we analyze the advantages and disadvantages of different myography methods by reviewing myography fusion methods. In a systematic review following the PRISMA guidelines, we identify and analyze studies that employ the fusion of different sensors and myography techniques, while also considering interface wearability. We also explore the properties of different fusion techniques in decoding user intentions. The fusion of electromyography, ultrasonography, mechanomyography, and near-infrared spectroscopy as well as other sensing such as inertial measurement units and optical sensing methods has been of continuous interest over the last decade with the main focus decoding the user intention for the upper limb. From the systematic review, it can be concluded that the fusion of two or more myography methods leads to a better performance for the decoding of a user’s intention. Furthermore, promising sensor fusion techniques for different applications were also identified based on the existing literature.
Pandemic Portraits—An Intersectional Analysis of the Experiences of People with Disabilities and Caregivers during COVID-19 in Bangladesh and Liberia
Authors: Chowdhury Shahreen , Urme Salma Akter , Nyehn Boakai A. , Mark Heylove R. , Hassan Md. Tanvir , Rashid Sabina F. , Harris Naomi B. , Dean Laura
Published: August 2022

COVID-19 significantly affected people with disabilities, with many facing additional barriers in access to services and increased risks of poor health and social outcomes. Focusing on the impact of COVID-19 in the Global South, this study took place in Bangladesh and Liberia, where 14% and 16% of the population are thought to live with disabilities. However, there is minimal research on the needs and experiences of this population group and how these are shaped by intersecting axes of inequity. Furthermore, disabled people are often excluded from being actively involved in research. To address these evidence gaps, we used the creative participatory method of photovoice remotely to document experiences of COVID-19 through the lens of people with physical and psychosocial disabilities and their caregivers as co-researchers. The findings present themes relating to inaccessibility, social connection, hopes and fears. The nexus between disability and poverty was exacerbated for many in both settings, while psychosocial impacts of COVID-19 included increased stigmatisation and isolation. However, themes of faith, support and adaptability were also highlighted in stories of community care, nature and healing. Photovoice, through imagery and storytelling, was a powerful tool in prioritising the voices of disabled people, adding to an evidence base to inform inclusive pandemic responses.
A Symmetric Form of the Mean Value Involving Non-Isomorphic Abelian Groups
Authors: Fan Haihong , Zhai Wenguang
Published: August 2022

Let a(n) be the number of non-isomorphic abelian groups of order n. In this paper, we study a symmetric form of the average value with respect to a(n) and prove an asymptotic formula. Furthermore, we study an analogue of the well-known Titchmarsh divisor problem involving a(n).
Improved Analytical Solution for Air–Boosted Vacuum Consolidation of Saturated Soil Using Eigenfunction Expansion Method
Authors: Xie Liquan , Liang Zelong , Feng Guangrui , Li Yanhong , Wu Tongqing
Published: August 2022

Soft foundation consolidation engineering applications and experimental studies have proven the effectiveness of the air–boosted vacuum preloading method (AVP). The sand well consolidation theory, a typical axisymmetric consolidation, is adapted to analyze the whole consolidation process of the saturated soil by air–boosted vacuum preloading. The present analytical solution for air–boosted vacuum consolidation of the saturated soil is more suitable for application in a deep soft foundation. With the solving method, the general solution through separation of variables is used, which is mathematically used for the homogeneous partial differential equations. However, the partial differential equations for solving the consolidation of the AVP method are nonhomogeneous. Therefore, the eigenfunction expansion method for nonhomogeneous equations is proposed and validated in this study. Results showed that the improved analytical solution by the eigenfunction expansion method is more consistent with the numerical solution than that of the previous method using the general solution by separation of variables, which leads to a lower error ratio of less than 2%. The improved analytical solution can be used to predict the consolidation of deep foundations by air–boosted vacuum preloading effectively.
Computational Study of MHD Darcy–Forchheimer Hybrid Nanofluid Flow under the Influence of Chemical Reaction and Activation Energy over a Stretching Surface
Authors: Haq Izharul , Yassen Mansour F. , Ghoneim Mohamed E. , Bilal Muhammad , Ali Aatif , Weera Wajaree
Published: August 2022

The energy and mass transition through Newtonian hybrid nanofluid flow comprised of copper Cu and aluminum oxide (Al2O3) nanoparticles (nps) over an extended surface has been reported. The thermal and velocity slip conditions are also considered. Such a type of physical problems mostly occurs in symmetrical phenomena and are applicable in physics, engineering, applied mathematics, and computer science. For desired outputs, the fluid flow has been studied under the consequences of the Darcy effect, thermophoresis diffusion and Brownian motion, heat absorption, viscous dissipation, and thermal radiation. An inclined magnetic field is applied to fluid flow to regulate the flow stream. Hybrid nanofluid is created by the dispensation of Cu and Al2O3 nps in the base fluid (water). For this purpose, the flow dynamics have been designed as a system of nonlinear PDEs, which are simplified to a system of dimensionless ODEs through resemblance substitution. The parametric continuation method is used to resolve the obtained set of dimensionless differential equations. It has been noticed that the consequences of heat absorption and thermal radiation boost the energy transmission rate; however, the effect of suction constraint and Darcy–Forchhemier significantly diminished the heat transference rate of hybrid nanofluids. Furthermore, the dispersion of Cu and Al2O3 nps in the base fluid remarkably magnifies the velocity and energy transmission rate.
A Bivalent Trans-Amplifying RNA Vaccine Candidate Induces Potent Chikungunya and Ross River Virus Specific Immune Responses
Authors: Schmidt Christin , Hastert Florian D. , Gerbeth Julia , Beissert Tim , Sahin Ugur , Perkovic Mario , Schnierle Barbara S.
Published: August 2022

Alphaviruses such as the human pathogenic chikungunya virus (CHIKV) and Ross River virus (RRV) can cause explosive outbreaks raising public health concerns. However, no vaccine or specific antiviral treatment is yet available. We recently established a CHIKV vaccine candidate based on trans-amplifying RNA (taRNA). This novel system consists of a replicase-encoding mRNA and a trans-replicon (TR) RNA encoding the antigen. The TR-RNA is amplified by the replicase in situ. We were interested in determining whether multiple TR-RNAs can be amplified in parallel and if, thus, a multivalent vaccine candidate can be generated. In vitro, we observed an efficient amplification of two TR-RNAs, encoding for the CHIKV and the RRV envelope proteins, by the replicase, which resulted in a high antigen expression. Vaccination of BALB/c mice with the two TR-RNAs induced CHIKV- and RRV-specific humoral and cellular immune responses. However, antibody titers and neutralization capacity were higher after immunization with a single TR-RNA. In contrast, alphavirus-specific T cell responses were equally potent after the bivalent vaccination. These data show the proof-of-principle that the taRNA system can be used to generate multivalent vaccines; however, further optimizations will be needed for clinical application.
Developing Water-Quality Model for Jingpo Lake Based on EFDC
Authors: Qin Zihan , He Zhengwei , Wu Guozheng , Tang Gula , Wang Qian
Published: August 2022

Water-quality model simulation is the key to understanding hydrological processes and water-quality dynamic(s). In this study, Jingpo Lake, which is the most typical lake in the northern cold region of China, was selected as the research object. A numerical simulation model for transporting and diffusing the chemical oxygen demand (CODMn) and ammonia nitrogen (NH3N) with ice-covered and open-water periods was constructed and calibrated using the Environmental Fluid Dynamics Code (EFDC). Parameters such as the bottom roughness, ice roughness, diffusion coefficient, horizontal momentum diffusivity, molecular eddy viscosity, molecular diffusivity, buoyancy influence coefficient, CODMn decay rate and NH3N decay rate were validated. The research findings show that there were differences in the hydrodynamic water-quality changing process during the ice-covered and open-water periods, as well as for the seasonal ice-covered waterbody. The key parameter decay rates of the CODMn and NH3N in the ice-covered periods were lower than those in the open-water periods due to the water-temperature decline. The R2 of the CODMn and NH3N reached 90.71% and 79.79%, respectively. Thus, it may be concluded that the EFDC model could well reflect changes in the water level of Jingpo Lake, as well as the transport and diffusion of the CODMn and NH3N in Jingpo Lake.
Exacerbation of chronic arachnoiditis as one of the causes of transient headache
Authors:   Regional Clinical Hospital, Khabarovsk, Gulyabin K. R.
Published: August 2022

Arachnoiditis is an organic lesion of the brain, manifested as diffuse productive inflammation in the arachnoid membrane of the brain with the formation of adhesions and cysts, involving the pia mater, ependyma and subependymal layer of the ventricles and choroid plexuses in the pathological process. The incidence of the disease is approximately 3–5 % among all organic lesions of the central nervous system. Arachnoiditis can be autoimmune in nature, the pathogenesis of which is hyperproduction of autoantibodies followed by hyperplasia of the arachnoid endothelium as a result of their effect, or manifest itself as residual manifestations after a neuroinfection or traumatic brain injury. In most cases, focal symptoms accompanying arachnoiditis are associated with irritant action and involvement of the underlying brain structures in the adhesive process. The clinical picture is a complex symptom complex, including a combination of general infectious, cerebral, focal symptoms and signs of changes in the composition of the cerebrospinal fluid. Of the cerebral symptoms, headache comes first; it occurs in 80 % of patients with a history of arachnoiditis. The greatest intensity of the headache is noted in the early morning hours; very often it is accompanied by nausea and vomiting. In the vast majority of cases, this pain is based on intracranial hypertension. In addition to headaches, non-systemic dizziness is observed, and autonomic dysfunction and increased sensory excitability are noted in those suffering from chronic arachnoiditis.
Deserción Universitaria; un estudio preliminar en los Programas Educativos de Administración y Contaduría Pública
Authors: Rascón-Larios Angélica María
Published: August 2022

La deserción en las instituciones educativas de nivel superior; su estudio y seguimiento, ha tomado relevancia en los últimos años; por un lado, al ser uno de los principales problemas que afrontan; incrementándose por motivos de la pandemia y que indudablemente afecto al sector estudiantil y por otro, al tratar de mantener la calidad educativa institucional, siendo uno de los indicadores evaluados por los organismos acreditadores del país en todos los programas educativos. Lo que aquí se expone, es la primera fase de una investigación desarrollada para conocer los factores de deserción en los alumnos de la Licenciatura en Administración y Licenciatura en Contaduría Pública del Departamento de Ciencias Económico Administrativas de la Unidad Regional Sur de la Universidad de Sonora. Esta etapa tuvo el propósito de identificar los casos de alumnos registrados en los períodos 2018-2, 2019-2 y 2020-2 que al ciclo 2021-2 habían abandonado sus carreras y su proporción en el período de confinamiento y que actualmente debían de cursar el cuarto, sexto y octavo semestre. La población total analizada fue de 200 estudiantes de los dos programas, contabilizándose finalmente en las cohortes un abandono de 15 CP y 23 LA. Estos resultados han permitido iniciar la siguiente fase del estudio para conocer las razones de su deserción.
Investigación y evaluación del desempeño, dilemas en la eficacia y eficiencia de servicios públicos municipales
Authors: Tobar Domínguez Eddy Rolando
Published: August 2022

La investigación en la gestión pública municipal, se constituye en un baluarte para medir la eficacia y eficiencia en la prestación de servicios. El objetivo de esta revisión documental fue analizar la importancia de la investigación en organizaciones públicas, comparar estudios relacionados a mejorar la gestión municipal por medio de identificar factores como el rendimiento laboral, la evaluación del desempeño, y otros asociados al gobierno municipal. Fue una investigación de tipo documental. Los criterios de selección aplicados se optaron por publicaciones de fuentes primarias en los últimos cinco años. Se analizaron en total quince investigaciones con resultados que evidenciaron el aporte que genera la investigación en los asuntos públicos, lo notable que es la gestión del talento humano dentro de las organizaciones, además, la relación causal que existe entre el rendimiento laboral y evaluación del desempeño, como factores asociados a una gestión municipal eficaz y eficiente.
Incidencia del control interno (COSO-ERM) en la gestión logística de una empresa comercial
Authors: Rodríguez Delgado Elia Selene , Castillo Muncibay Micaela Margarita , Santos Maldonado Abrahan Braulio , Villanueva-Batallanos Marilyn
Published: August 2022

Un mal manejo del control interno hace posible que las empresas vean menguar sus ingresos, se acumulen los riesgos y puede desencadenar la quiebra de estas. Ante ello, la presente indagación buscó determinar cómo influye el control interno COSO-ERM en la gestión logística de la empresa Industria Papelera TRES ÁNGELES E.I.R.L. Por ello, se empleó la metodología mixta, de tipo descriptiva y corte transversal, además, se recolectó una muestra de 19 colaboradores del área logística de la empresa, cuya percepción fue medida a través de técnica de la encuesta, procesado por el sistema SPSS. Finalmente se comprobó que si existe una incidencia positiva del control interno (COSO-ERM) sobre la gestión logística, con una correlación Rho=0,798 y Sig.=0,00<0,05) positivo, de este modo, también se establece que la propuesta del control interno bajo el enfoque COSO-ERM, permite la correcta planificación y disminución de riesgos en la gestión logística
Pitahaya deshidratada, una alternativa de generar economía local (cantón Palora-Provincia Morona Santiago)
Authors: Aguiar Novillo Santiago , Uvidia Cabadiana Hernán
Published: August 2022

El cultivo de la Pitahaya es el principal rubro del Cantón Palora – Provincia de Morona Santiago en la Amazonia ecuatoriana, aportando en su desarrollo local. El objetivo de la presente revisión fue describir técnicas del proceso de elaboración de pitahaya deshidratada como una alternativa para el desarrollo económico local, mediante una investigación teórica con un enfoque documental, obteniendo información de fuentes confiables (artículos científicos, revisiones, tesis y páginas web) conservando la idea original de los diversos autores. Entre los procesos de deshidratación se tiene por convección, conducción, radiación, liofilización, osmótica, natural y por congelación, lo que tienen en común estos procesos es reducir la cantidad acuosa de la fruta formando un producto sólido, sin embargo, debido a los bajos costos de aplicación y factibilidad evidencian que la técnica de deshidratación por convección es la recomendada. La estandarización del proceso de deshidratación constituye un sistema complejo el cual podría ser realizado por los productores de la comunidad.
Programa de prevención y control para disminuir la morbilidad y la mortalidad por COVID-19 en el municipio de la Santísima Trinidad
Authors: Justiniano Méndez Jesús Alberto
Published: August 2022

La enfermedad COVID-19 ha afectado la salud, la economía y los estilos de vida de la población mundial, la ciudad de la Santísima Trinidad del departamento del Beni - Bolivia sufrió una de las peores tragedias sanitarias de su historia por la pandemia, con el más alto índice de riesgo y elevadas tasas de incidencia de Morbimortalidad. El objetivo de la investigación fue elaborar un programa de prevención y control de COVID-19 para contribuir a disminuir la tasa de incidencia de morbilidad y de mortalidad. Se aplicaron métodos teóricos como fueron el dialéctico, el holístico - holográfico, el sistémico estructural– funcional, la modelación y el histórico; además se trabajó con los métodos empíricos como la observación científica y la medición, aunado a las técnicas para la revisión documental, así como la entrevista y la encuesta. Se observó que las tasas de incidencia de Morbimortalidad fueron las más altas del departamento del Beni y del Estado Plurinacional de Bolivia  no se realizó una planificación adecuada para la prevención y control del COVID-19, lo que saturo los establecimientos de salud y colapsó el sistema de salud. Las conclusiones se sistematizó los fundamentos teóricos sobre la morbilidad, mortalidad y programas de prevención y control del COVID-19, se elaboró un modelo teórico, en el cual se precisó la estructura interna, los componentes y sus relaciones y se elaboró un programa de prevención y control contra el COVID-19.
Hemoglobina reticulocitaria y su utilidad clínica en el diagnóstico temprano de eritropoyesis por deficiencia de hierro absoluto en mujeres adolescentes
Authors: Cayo Toaquiza Myrian Doris , Castro Jalca Jazmin Elena , Ponce Floreano Diana Lourdes , Castro Jalca Alexander Dario
Published: August 2022

La hemoglobina reticulocitaria es un nuevo parámetro dentro de los autoanalizadores hematológicos de cuarta generación, siendo indispensable en el diagnóstico y manejo de eritropoyesis deficiente en hierro, especialmente la deficiencia funcional de hierro, el secuestro de hierro y la deficiencia absoluta de hierro. Además, este parámetro demuestra ser más preciso que las pruebas bioquímicas como el hierro sérico, la ferritina y la saturación de transferrina, en la detección precoz de eritropoyesis deficiente en hierro. El objetivo de la investigación fue describir la utilidad clínica de la hemoglobina reticulocitaria (CHr) en el diagnóstico temprano de eritropoyesis por deficiencia de hierro absoluto en mujeres adolescentes. El tipo de investigación fue descriptivo, analítico, el diseño de campo transversal. La muestra voluntaria, no aleatoria estuvo constituida por 62 mujeres adolescentes con edades comprendidas entre los 14 y 19 años. Como resultado se encontró que el 97% de la muestra tiene disminución de la CHr, indicando eritropoyesis deficiente en hierro, mientras que un 3% de las adolescentes presentan valores normales para la CHr, se realizó la relación diagnostica entre pruebas de laboratorio tales como CHr y el Hierro sérico. También se reportó que el 93% de la muestra presenta déficit de hierro sin anemia, y un 7% tiene anemia ferropénica, el rango de edad con mayor predominio de anemia ferropénica fue entre los 14 y 16 años. Se concluye que la CHr es de utilidad clínica y una nueva herramienta de diagnóstico temprano de eritropoyesis por deficiencia de hierro