bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development of a laboratory and experimental installation for checking the reliability of a mathematical model and an information and technical method for preventing emergencies at landfills of solid household waste with technological liquidation energy-intensive equipment
Authors: Azarenko Olena , Mirnenko Volodymyr , Rashkevich Nina , Shevchenko Olga , Shevchenko Tatyana 
Published: August 2021

The paper presents a developed laboratory setup that allows experimental studies of the influence of indicators of the physical state of landfill soil on the stability of slopes to shear, to check the reliability of the mathematical model and the information and technical method developed on its basis for preventing emergencies of the cascade type of propagation due to the displacement of landfill soil on a solid landfill household waste with technological liquidation energy-intensive equipment. The main elements of the developed installation are a rectangular experimental box with swivel and fixed parts, swivel and locking mechanisms, tabletop plates, a sprayer, and a tangential load system. As the main requirements for the installation, the possibility of conducting a series of experiments based on the use of landslide experimental blocks with a change in their humidity, density, temperature and angle of inclination of the base of the sliding surface, as well as mechanical characteristics - the angle of internal friction, specific adhesion of landfill soil. Carrying out research using a laboratory setup is based on the assumption that the transition of a landslide experimental block of landfill soil into a dynamic state is considered the onset of an emergency at the object level of distribution.
In the course of the work, a technique was developed for conducting experimental studies and processing observation results. The methodology includes the following procedures: establishment of initial and boundary conditions; preparation of a laboratory installation; conducting a series of experiments to determine the mechanical parameters and the shear angle of the experimental blocks, and a series of experiments to determine the indicators of moisture, temperature and density of landfill soil on the fact of the shift, taking into account the gradual increase in moisture; statistical processing to obtain a statistical sample of the values of the effective indicators of the physical state of landfill soil included in the confidence interval according to the classical statistical method - Student's t-test.
MULTIPLE DIRECTION INTERFERENCE SUPPRESSION BY UNIFORM LINEAR PHASED ARRAY SIDELOBE EFFICIENT CANCELLER
Authors: Romanuke Vadim 
Published: August 2021

Background. For radar systems, the beam pattern of a uniform linear array (ULA) is synthesized to ensure signal selectivity by direction. A specific ULA sidelobe is cancelled by rescaling the beam weights. In particular, this is done by increasing the number of sensors and shortening the scanning step. However, a noticeable limitation is a loss of the transmitted power. Therefore, the problem is to optimally balance the number of sensors versus effective ULA sidelobe cancellation.
Objective. In order to ensure multiple direction interference suppression, the goal is to find an optimal number of ULA radar sensors for the beam pattern synthesis. The criterion is to determine such a minimum of these sensors at which mainlobes towards useful signal directions are evened as much as possible.
Methods. To achieve the said goal, the ULA sidelobe cancellation is simulated. The simulation is configured and carried out by using MATLAB® R2020b Phased Array System ToolboxTM functions based on an algorithm of the sidelobe cancellation.
Results. By increasing the number of ULA sensors, the beam pattern lobes are not only thinned but also change in their power. In particular, the interference direction sidelobes become relatively stronger. The number of sensors is limited by the three influencing factors: the thinned-array curse transmitted power loss, the aperture size, and the sidelobes intensification.
Conclusions. An optimal number of ULA radar sensors for the beam pattern synthesis can be found when the scanning step is equal to the least distance between adjacent interference directions. At the start, the number of sensors is set at the number of useful signal directions. If the mainlobes towards useful signal directions are not evened enough, the set of interference directions is corrected.
Keywords: radar phased array; beam pattern; interference direction; sidelobe cancellation; aperture size.
METHOD OF TRANSMITTING INFORMATION ON THE INTERNET OF THINGS
Authors: Mikhnenko Yaroslav , Skulysh Mariia , Kurdecha Vasil , Mikhnenko Galyna 
Published: August 2021

Background. The IoT technology covers devices and appliances, such as thermostats, home security systems and cameras, lighting fixtures as well as other household appliances that support one or more shared ecosystems, and can be controlled by devices associated with that ecosystem, for example with smartphones and smart speakers. However, there are a lot of problems to be solved. One of these problems is the power supply of wireless sensors on the Internet of Things.
Objective. The purpose of the study is to reduce energy consumption of IoT devices in the process of transmitting the collected data by regulating the number of transmission transactions.
Methods. The analysis of the existing energy saving methods in IoT devices shows that the problem of choosing the optimal buffer size has not yet been solved. An optimization problem has been formulated, which allows considering the requirements for the quality of transmission of both information flows and communication systems that provide this transfer.
Results. The article presents the modified method of information transmission to improve the energy efficiency of the network. The need to allocate a queue buffer at each of the nodes and explain the operation of the node using the queue buffer has been highlighted. The scheme of the project with the use of the modified Sleep / Wake algorithm has been created.
Conclusions. The main idea of the method is to allocate a buffer at each node with a certain threshold value, and if the latter is exceeded, the transmission of information packets will begin. This increases the service life of WSN by 14.8… 20.6% compared to the IoT sensor networks that use an asynchronous queue cycle.
Keywords: IoT; energy efficiency; life expectancy of the IoT network.
MUTUAL COUPLING COEFFICIENTS OF ROTATING RECTANGULAR DIELECTRIC RESONATORS IN CUT-OFF RECTANGULAR WAVEGUIDE
Authors: Trubin Alexander 
Published: August 2021

Background. A further increase in the speed of information transfer is determined by more stringent requirements for the elements of communication devices. One of the most important components of such devices is various filters, which are often made on the basis of dielectric resonators. Calculation of the parameters of multi-section filters is impossible without further development of the theory of their design. The development of filter theory is based on electrodynamic modelling, which involves calculating the coupling coefficients of dielectric resonators in various transmission lines.
Objective. The aim of the research is to calculate and study the coupling coefficients of rectangular dielectric resonators with a rectangular metal waveguide when their axes rotate. Investigation of new effects to improve the performance of filters and other devices based on them.
Methods. Methods of technical electrodynamics are used to calculate and analyse the coupling coefficients. The end result is to obtain new analytical formulas for new structures with rectangular dielectric resonators, which make it possible to analyse and calculate their coupling coefficients.
Results. New analytical expressions are found for the coupling coefficients of dielectric resonators with the rotation of their axes in a rectangular waveguide.
Conclusions. The theory of designing filters based on new structures of dielectric resonators with rotation of their axes in metal waveguides has been expanded. New analytical relationships and new patterns of change in the coupling coefficients are found.
Keywords: dielectric filter; rectangular dielectric resonator; rotation; coupling coefficients.
ANALYSIS OF TELECOMMUNICATION CHANNEL SPECTRAL CHARACTERISTICS WITH BLOCK CODING AT A CONSTANT SPEED OF THE MESSAGE SOURCE
Authors: Uryvsky Leonid , Korniienko Andriy , Shmigel Bohdan 
Published: August 2021

Background. The direction of development of modern electronic communication systems tends to increase the speed of information transmission. In turn, increasing the speed requires the use of additional resources of the communication channel and tools to maintain the specified reliability of the transmission under limited conditions. But resources are not free. That is why there is a need to establish a relationship between the conditions for reliable transmission in high-speed channels and the spectral and energy parameters of the information transmission system.
Objective. The purpose of the paper is to analyse and describe the effect of block noise-tolerant coding on the rate of transmission of symbols in the communication channel while ensuring the required reliability of information transmission at a constant speed of the message source by increasing the frequency involved.
Methods. The initial stage of the study is the presentation of system parameters in case of inaccurate transmission. Then a block redundant code is synthesized, which ensures the reliability of information transmission and the procedure of spreading the spectrum at a fixed speed of the message source is performed.
Results. Recommendations on the method of selecting coding parameters in the procedure of spreading the spectrum and provided that the speed of the message source is constant are formed.
Conclusions. Analysis of the possibilities of noise-tolerant coding at different energies of the communication channel under conditions of increasing the channel transmission rate at a fixed speed of the message source.
Keywords: speed; message source; reliability; noise immunity.
Internal Limiting Membrane Peeling and Dexamethasone Intravitreal Implant for the Management of a Retinal Macroaneurysm Rupture
Authors: Sanjuán Pablo , Lázaro-Rodríguez Víctor , Samaan Muhsen , Elizalde Javier 
Published: August 2021

Abstract
Background: To describe an effective combined surgical and pharmacological approach for the management of a sub-internal limiting membrane (sub-ILM) macular hemorrhage and exudation related to a retinal arterial macroaneurysm (RAM) decompensation.Methods: Pars plana vitrectomy (PPV) was performed, with an accurate forceps-assisted ILM removal, hemorrhage aspiration, and a dexamethasone intravitreal implant injection at the end of the surgery. Anatomical and functional outcomes were evaluated by fundus examination, spectral-domain optical coherence tomography (SD-OCT), optical coherence tomography angiography (OCT-A) and best-corrected visual acuity (BCVA). Results: Postoperative outcome revealed that sub-ILM blood was successfully cleaned, and the RAM became progressively thrombosed with complete resolution of the exudation. Three months after surgery, BCVA improved from 20/400 to 20/80 with no signs of recurrence.Conclusion: This combined surgical and pharmacological approach could be an effective technique for the management of sub-ILM hemorrhage secondary to RAM decompensation, and favors anatomical macular restoration and significant recovery of the visual acuity.
A Deep Neural Network approach for P300 detection-based BCI using single-channel EEG scalogram images
Authors: Singh Sinam Ajitkumar , Meitei Takhellambam Gautam , Devi Ningthoujam Dinita , Majumder Swanirbhar 
Published: August 2021

Abstract
Brain-computer interfaces ( BCIs ) acquire electroencephalogram (EEG) signals and interpret them into a command that helps people with severe motor disabilities using single channel. The goal of BCI is to achieve a prototype that supports disabled people to develop the relevant function. Various studies have been implemented in the literature to achieve a superior design. The main novelty of the proposed P300 detection-based BCI model is associated with the usage of a single-channel. In this work, we introduced a denoising approach using the bandpass filter technique followed by the transformation of scalogram images using continuous wavelet transform. The derived images were trained and validated using a deep neural network based on the transfer learning approach. This paper presents a BCI model based on the deep network that delivers higher performance in terms of classification accuracy and bitrate for disabled subjects using a single-channel EEG signal. The proposed P300 based BCI model has the highest average information transfer rates of 13.23 to 26.48 bits/min for disabled subjects. The classification performance has shown that the deep network based on the transfer learning approach can offer comparable performance with other state-of-the-art-method. This article does not contain any studies with human participants performed by any of the authors. However, the data was collected by EPFL which is available open for the researchers to work upon.
Observing Errors in a Combination of Error and Correct Models Favors Observational Motor Learning
Authors: Tang Zhi-Ming , Oouchida Yutaka , Wang Meng-Xin , Dou Zu-Lin , Izumi Shin-Ichi 
Published: August 2021

Abstract
Background:Imitative learning is highly effective from infancy to old age, but little is known about the effects of observing errors during imitative learning. This study aims to examine how observing errors affect imitative learning performance, to maximize the effects of imitative learning. Method：In the pre-training session, participants were instructed to pinch at the target force (8 N) with auditory feedback about generated force while watching videos of someone pinching a sponge at the target force. In the pre-test, participants pinched at the target force without viewing a model or receiving auditory feedback. In Experiment 1, in the main training session, participants imitated models while watching videos of pinching at either the incorrect force (error-mixed condition) or the target force (all-correct condition). Then, the exact force they generated in pinching was measured without receiving auditory feedback or viewing a model. In Experiment 2, using the same procedure in the pre-training and pre-test sessions, newly recruited participants watched pinching at incorrect forces (4 and 24 N) as the all-error condition and the correct force as the correct condition. Results: In Experiment 1, the average force was better in the error-mixed condition than in the correct condition. In Experiment 2, the average force in the correct condition was better than that in the error condition.Conclusion: Our findings indicate that observing error actions combined with correct actions affected imitation motor learning positively, because error actions contain what-not-to-do information about the target action, unlike correct actions, which provide more information to enhance imitative learning.
Risk Factors For Long-Term Survival in Patients With ypN+M0 Rectal Cancer After Radical Anterior Resection
Authors: Zeman Marcin , Skałba Władysław , Szymański Piotr , Hadasik Grzegorz , Żaworonkow Dmytro , Walczak Dominik Andrzej , Czarniecka Agnieszka 
Published: August 2021

Abstract
Background: Regional lymph node metastases are the main adverse prognostic factor in patients with rectal cancer without distant metastases. There are discrepancies, however, regarding additional risk factors in the group of ypN+M0 patients.The purpose of the study was to assess clinical and pathological factors affecting long-term oncological outcomes in the group of ypN+M0 patients after radical rectal anterior resection.Methods: 112 patients with ypN+M0 rectal cancer after neoadjuvant therapy and radical anterior resection were subject to a retrospective analysis. The effect of potential factors on survival was assessed with the use of Kaplan-Meier curves together with a log-rank test and multiple factor Cox proportional hazards model.Results: In the multiple factor Cox analysis, adverse factors affecting OS were: the use of angiotensin-converting enzyme inhibitors (ACEIs) (HR: 3.059, 95% CI: 1.349-6.934, p= 0.007) and past <=3 cycles of adjuvant chemotherapy (HR: 2.833, 95% CI: 1.289-6.229, p= 0.01). For DFS, significant adverse factors were: the use of ACEIs (HR: 3.11, 95%CI: 1.01-9.56, p= 0.047), presence of perineural invasion (HR: 7.27, 95% CI: 2.74-19.3, p< 0.001) and occurrence of postoperative complications (HR: 6.79, 95% CI: 2.09-22.11, p= 0.001), while a positive factor was the negative lymph node (NLN) count >7 (HR: 0.33, 95% CI: 0.12-0.88, p= 0.026). Conclusions: The use of ACEIs may have a negative effect on long-term treatment outcomes in patients with ypN+M0 rectal cancer. In this group of patients, the NLN count seems to be an important prognostic factor, as well.
A Facile Strategy to Fabricate Silver-Functionalized Superhydrophobic Cotton Fabrics with Long-Term Antibacterial Properties
Authors: Ye Zhanpeng , Rong Hui , Li Shuangyang , Ma Qing , Deng Liandong , Zhang Jianhua , Dong Anjie 
Published: August 2021

Abstract
Silver-functionalized textiles, have attracted considerable attention as the most common protective medical materials. However, their poor antibacterial durability and relatively tedious preparation process limit their applications. In this study, a kind of multifunctional cotton fabric was prepared through simultaneous dip-coating of silver-silica hybrid nanoparticles (Ag-MSNs) and fluorinated MSNs (F-MSNs), leading to excellent antifouling due to superhydrophobicity and long-term antibacterial properties from the sustained release of Ag ions (Ag+). Detailed studies were performed to evaluate their structure and protective performance, especially the long-term antibacterial properties of the obtained fabrics through the inhibition zone experiment for 25 d. The as-prepared fabrics showed good non-wetting properties and sustained antibacterial activity against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). Further washing and abrasion experimentations demonstrated that the as-prepared fabrics had stable hydrophobicity and antibacterial properties, much more reliable than commercially derived antibacterial gauze. Considering the readily available inexpensive materials and simple preparation process as well as long-term and efficient sterilization effect, the strategy provided herein opens a new and facile way to fabricate multifunctional fabrics with robust hydrophobic and antibacterial activity for the future medical materials.
Anionic Surfactants Monitoring In Healthcare Facilities - A Case of Belo Horizonte City, Brazil
Authors: Trajano Graziela Torres , Vasconcelos Olívia Maria S Ribeiro , Pataca Luiz Carlos Moutinho , Mol Marcos Paulo Gomes 
Published: August 2021

Abstract
Surfactants are substances that when in aquatic environments, can cause negative impacts. Hospital effluents carry numerous chemicals daily, including surfactants, used in sanitization and disinfection procedures. These chemicals are found in different concentrations in the effluents and reach water bodies due to a lack of proper removal in the wastewater treatment plants. The present study investigated data about effluents monitoring from healthcare facilities located in the city of Belo Horizonte, Brazil, focusing on anionic surfactants. The results showed, in 2018, a total of 72 establishments monitoring this parameter, resulting in a median concentration of 1 mg⋅L-1 of anionic surfactants in the period. Cationic surfactants still do not have specific legislation in the studied country that dictates a limit for discharge into sewage, however, these compounds are used in the formulation of routine hospital products.
Striatal dopamine dissociates methylphenidate effects on value-based versus surprise-based reversal learning
Authors: Bosch Ruben van den , Lambregts Britt , Määttä Jessica , Hofmans Lieke , Papadopetraki Danae , Westbrook Andrew , Verkes Robbert-Jan , Booij Jan , Cools Roshan 
Published: August 2021

Abstract
Psychostimulants such as methylphenidate are widely used for their cognitive enhancing effects, but there is large variability in the direction and extent of these effects, and there are concerns about the potential for abuse. We tested the hypothesis that methylphenidate enhances or impairs reward/punishment-based reversal learning depending on baseline striatal dopamine levels and corticostriatal gating of reward/punishment-related representations in stimulus-specific sensory cortex. Young healthy adults were scanned with functional magnetic resonance imaging during a reward/punishment reversal learning task, after intake of methylphenidate or the selective D2/3-receptor antagonist sulpiride. Striatal dopamine synthesis capacity was indexed with [18F]DOPA positron emission tomography. Reward versus punishment learning signals were boosted to a greater degree in participants with higher dopamine synthesis capacity. By contrast, striatal and stimulus-specific sensory surprise signals were boosted in participants with lower dopamine synthesis. These results unravel the mechanisms by which methylphenidate modulates reward and attention, impacting our understanding of how it can both enhance attention and mitigate reward-related compulsivity.
Ultrasound-Guided Superficial Serratus Plane Block for Persistent Post-Mastectomy Pain: Four Case Reports
Authors: Liu Qian , Ashish Khanna , Stubblefield Michael , Yue Guanghui , Allexandre Didier 
Published: August 2021

Abstract
Background: Persistent post-mastectomy pain (PPMP) is common after surgery. Although multiple modalities have been used to treat this type of pain, including physical medicine, physical therapy and interventional approaches, managing PPMP may be still a challenge for breast cancer survivors. Currently, serratus plane block (SPB) as a novel regional anesthetic technique shows promising results for controlling chronic pain. Methods: We report four cases of patients with PPMP that were performed using superficial serratus plane block (SSPB) at our clinic. A retrospective review of effect of pain relief was collected through postprocedure interviews.Results: We found that two of our patients were successfully treated with SSPB for pain after treatment for breast cancer. The third patient had an intercostobrachial nerve block that produced incomplete pain relief, but had adequate pain relief with a SSPB. However, the fourth patient reported no pain relief after SSPB.Conclusion: These cases illustrate that the patients with PPMP could benefit from SSPB. Particularly, we find patients with a subjective sense of “tightness” relating to reconstructive surgeries may be a good candidate for SSPB. Further studies are warranted to evaluate this block for PPMP, as it is low risk and relatively simple to perform.