bluuebunny/crossref_metadata_2025 huggingface dataset:
Physical Activity, Mental Health and Wellbeing During the first COVID-19 Containment in New Zealand: A Cross-sectional Study
Authors: O’Brien Wendy J , Badenhorst Claire E , Draper Nick , Basu Arindam , Elliot Catherine A , Hamlin Michael J , Batten John , Lambrick Danielle , Faulkner James
Published: July 2021

Strategies implemented worldwide to contain COVID-19 outbreaks varied in severity across different countries, and established a new normal for work and school life (i.e. from home) for many people, reducing opportunities for physical activity. Positive relationships of physical activity with both mental and physical health are well recognised, therefore the aim was to ascertain how New Zealand’s lockdown restrictions impacted physical activity and mental health and wellbeing. Participants (n=4007; mean±SD: age 46.5±14.7y, 72% female, 80.7% New Zealand European) completed (10–26 April 2020) an online amalgamated survey (Qualtrics): International Physical Activity Questionnaire: Short Form; Depression, Anxiety and Stress Scale-9; World Health Organization-Five Well-being Index; Stages of Change Scale. Positive dose response relationships between physical activity levels and wellbeing scores were demonstrated for estimates that were unadjusted (moderate activity OR 3.79, CI 2.88-4.92; high activity OR 8.04, CI 6.07-10.7) and adjusted (confounding variables: age, gender, socioeconomic status, time sitting, co-morbidities) (moderate activity 1.57, CI 1.11-2.52; high activity 2.85, CI 1.97-4.14). The study results support previous research demonstrating beneficial effects of regular physical activity on mental health and wellbeing. Governments may use such results to promote meeting physical activity guidelines in order to protect mental health and wellbeing during the ongoing COVID-19 and future pandemics.
Can Inr on Admission Be a New Prognostic Parameter in Patients with Acute Pulmonary Embolism?
Authors: Ptaszyńska-Kopczyńska Katarzyna , Sawicka Emilia , Ciurzyński Michał , Milewski Robert , Kiluk Izabela , Krajewska Agnieszka , Kosacka Urszula , Skowrońska Marta , Plywaczewska Magdalena , Furdyna Aleksandra , Kurnicka Katarzyna , Pruszczyk Piotr , Musial Wlodzimierz J. , Kamiński Karol Adam , Sobkowicz Bozena
Published: July 2021

Pulmonary embolism (PE) is one of the leading causes of cardiovascular mortality, therefore new parameters regarding risk stratification are sought after. In patients admitted for acute PE we investigated associations between the initial coagulation impairment, expressed by prothrombin time international normalised ratio (INR), and parameters reflecting PE severity. Furthermore, in-hospital, 30-day and long-term mortality were also evaluated. The analysis included 848 patients who were divided into two groups: with normal INR≤1.2, and elevated INR>1.2 (252 patients, 29.7%). The group with elevated INR presented higher incidence of tachycardia and lower systolic blood pressure, higher CRP, d-dimer, and NT-proBNP. This group presented higher estimated systolic pulmonary artery pressure (49 IQR39-62mmHg vs 43 IQR32-53mmHg, p<0.001) and shorter pulmonary artery acceleration time (65 IQR55-85ms vs 81 IQR63-102ms; p<0.001). Patients with elevated INR had more often a sPESI of 1 or higher (78%vs60%, p=0.003). Cox regression model revealed that age, leukocyte level, SBP, neoplasm, and INR are associated with higher risk of death (p<0.001). Finally, elevated INR was associated with higher in-hospital (13%vs3%; p<0.001), 30-day (19%vs6%; p<0.001), and long-term mortality (p<0.001). Summing up, elevated INR on admission is frequent in patients with PE, reflects worse clinical condition and is related to PE severity and prognosis.
Stress Effect of Food Matrices on Viability of Probiotic Cells During Model Digestion
Authors: Matoušková Petra , Hoova Julie , Rysavka Petr , Marova Ivana
Published: July 2021

The aim was to evaluate the influence of model (alcohol, sugar, salt, protein and acid) and real foods and beverages on the viability of probiotics during incubation and artificial digestion. Viability of monocultures Lactobacillus acidophilus CCM4833 and Bifidobacterium breve CCM7825T and commercial mixture of 9 probiotic bacterial strains were tested by cultivation assay and flow cytometry. In model foods, the best viability was determined in the presence of 0.2 g/L glucose, 10% albumin and 10% ethanol. As the most suitable real food for probiotic survival complex protein and carbohydrate substrates were found, such as beef broth, potato salad with pork, chicken with rice, chocolate spread, porridge and yoghurt. The best liquid was milk and meat broth, followed by coca-cola, beer and coffee. Viability of probiotics was higher when consumed with meals than with beverages only. Addition of prebiotics increased the viability of probiotics especially in presence of instant and fast foods. Generally, the highest viability of probiotics during artificial digestion was observed in mixed culture in presence of protein, sugar and fat or their combination. The increase of cell viability observed in such foods during model digestion may further contribute to the positive effect of probiotics on human health.
Avoidance of Cybersecurity Threats with the Deployment of a Web-based Blockchain-Enabled Cybersecurity Awareness Model
Authors: Razaque Abdul , Alajlan Abrar M , Melaoune Noussaiba , Alotaibi Munif , Alotaibi Bandar , Dias Issabekov , OAD Ammar , Hariri Salim , Chenglin Zhao
Published: July 2021

The ignorance of or lack of knowledge about cybersecurity aspects causes a critical problem regarding confidentiality and privacy. This security problem will continue to exist even if the user possesses less expertise in information security. The modern IT technologies are well developed, and almost everyone uses the features of IT technologies and services within the Internet. However, people are being affected due to cybersecurity threats. People can adhere to the recommended cybersecurity guidelines, rules, adopted standards, and cybercrime preventive measures. However, it is not possible to entirely avoid cybercrimes. Cybercrimes often lead to sufficient business losses and spread forbidden themes (hatred, terrorism, child porn, etc.). Therefore, to reduce the risk of cybercrimes, a web-based Blockchain-enabled cybersecurity awareness program (WBCA) process is introduced in this paper. The proposed web-based cybersecurity awareness program trains users to improve their security skills. The proposed program helps with understanding the common behaviors of cybercriminals and improves user knowledge of cybersecurity hygiene, best cybersecurity practices, modern cybersecurity vulnerabilities, and trends. Furthermore, the proposed WBCA uses the Blockchain technology to protect the model from the potential threats. The proposed model is validated and tested using real-world cybersecurity topics with real users and cybersecurity experts. We anticipate that the proposed program can be extended to other domains, such as national or corporate courses, to increase the cybersecurity awareness level of users.
A New Symmetric Image Encryption Scheme Based on Block Level Processing Using Hash Function and AES
Authors: Thenmozhi R. , Rajeyyagari Sivaram , Balamuralitharan S.
Published: July 2021

Data could be in many forms like text, image, audio, video and many others. Amongst these data, processing image is of important concern even with sophisticated technologies. Generally, images consume more storage space and processing time. This work aims in attaining a novel image encryption strategy that consumes very less computational time with maximum security. The idea is to split the image into blocks and rearrange the pixels in diagonal fashion to achieve confusion. Next, the blocks are combined to form sub images and one block of the sub image is subjected to Secure Hash Algorithm (SHA 512 bits). The SHA bits are XORed with the remaining blocks of the sub image. Finally, the entire image is encrypted using Advanced Encryption Standard (AES). Decryption process is the exact reverse of encryption process. The computational overhead is very low, and security is efficient. The results are compared with existing encryption techniques.
Treatment of Periimplantitis - Electrolytic Cleaning versus Mechanical and Electrolytic Cleaning - A Randomized Controlled Clinical Trial – 18 Months Results
Authors: Schlee Markus , Wang Hom-Lay , Stumpf Thomas , Brodbeck Urs , Rathe Florian
Published: July 2021

Background: this RCT assesses the 18 months clinical outcomes after regenerative therapy of periimplantitis lesions using either an electrolytic method (EC) to remove biofilms or a combination of powder spray and electrolytic method (PEC). Materials and Methods: Twenty-four patients (24 implants) suffering from periimplantitis were randomly treated by EC or PEC followed by augmentation and submerged healing. Probing pocket depth (PPD), Bleeding on Probing (BoP), suppuration and standardized radiographs were assessed before surgery (T0), 6 months after augmentation (T1), 6 (T2) and 12 (T3) months after replacement of the restoration. Results: Mean of PPD changed from 5.8 ± 1.6 mm (T0) to 3.1 ± 1.4 mm (T3). While BoP and suppuration at T0 was 100 % BoP decreased at T2 to 36.8 % and at T3 to 35.3 %. Suppuration could be found 10.6% at T2 and 11.8% at T3. Radiologic bone level measured from the implant shoulder to the first visible bone to implant contact was 4.9 ± 1.9 mm at me-sial and 4.4 ± 2.2 mm at distal sites (T0) and 1.7 ± 1.7 mm and 1.5 ± 17 mm at T3. Conclusions: Significant radiographic bone fill and improvement of clinical parameters were demonstrated 18 months after therapy.
Cultural Acculturation of Yemeni Zapin Dance and Malay Dance in Malaysia As A Means of Islmic Teaching
Authors: Muzakir Hafis , Jazuli Ahmad
Published: July 2021

This research was conducted to explain the cultural acculturation of the Yemeni and Malay zapin dance as a means of da'wah Islamiyah in Malaysia. The method used in this research is descriptive qualitative. In this research, literature study was also carried out as a data collection method. There is a theory in this research, namely the theory of cultural diffusion and from the point of view of a historical approach. The aim of this research is to reveal the acculturation elements of the Yemeni and Malay zapin dance. Then describe the Islamic da'wah function and the value between the two parties behind the zapin dance. The results that can be concluded from the acculturation of the Yemeni zapin dances and the Malay dances in Malaysia are producing all kinds of changes including the elements of dancers, musical instruments, movements, and the lyrics or songs used in these dances.
Study of co-precipitated nanomaterials magnetic MnxCo1-xFe2O4 (with x = 0.50 & 0.75) for Photocatalyst Application in MB degradation
Authors: Sarifuddin Wahid Sidik , Utari Utari , Purnama Budi
Published: July 2021

The crystalline structure and magnetic properties of Mn1-xCoxFe2O4 (x = 0 & 0.25) was studied in this report. The ferrite materials were synthesized by the chemical co-precipitation method and calcinated at 1000oC for 5 hours. The obtained materials were characterized by FTIR, XRD and VSM, and for photocatalytic activity was measured by UV-Vis spectrometer. Vibration bands at tetrahedral and octahedral site were corresponded by  = 581.56 cm-1 and  = 465.83 cm-1 and 474.51 cm-1 . The obtained ferrite were confirmed by XRD as spinel structure and shown that the addition of number of Mn decreased crystallite size (D) and x-ray density (ρx), but lattice constants (a) increased. The crystallite size of samples with x = 0.50 was 34.85 nm, and x = 0.75 was 32.17 nm. The magnetic properties of nanoparticles shown that magnetization saturation (Ms)from 42.05 emu/g to 54.16 emu/g increased with the addition of number of Mn. The coercive field (Hc)decreased from 408.27 Oe to 258.37 Oe. Photocatalytic activity was observed by UV-Vis spectrometer, where percentage of MB degradation (E) increase with the addition of number on Mn from 49.08% to 69.06%, either rate constant (kapp) and half life time (t1/2).  Furthermore, ferrite material base Mn-Co-ferrite has good characteristic to applied for photocatalyst.
The application bispherical coordinate in Schrödinger equation for Mobius square plus modified Yukawa potential using Nikiforov Uvarov Functional Analysis (NUFA) method
Authors: Wibawa Briant Sabathino Harya , Suparmi A , Cari C
Published: July 2021

The application bispherical coordinates in Schrödinger equation for the Mobius square plus modified Yukawa potential have been obtained. The Schrödinger equation in bispherical coordinates for the separable Mobius square plus modified Yukawa potential consisting of the radial part and the angular part for the Mobius square plus modified Yukawa potential is solved using the variable separation method to reduce it to the radial part and angular part Schrödinger equation. The aim of this study was to solve the Schrödinger's equation of radial in bispherical coordinates for the Mobius square plus modified Yukawa potential using the Nikiforov Uvarov Functional Analysis (NUFA) method. Nikiforov Uvarov Functional Analysis (NUFA) method used to obtained energy spectrum equation and wave function for the Mobius square plus modified Yukawa potential. The result of energy spectrum equation for Mobius square plus modified Yukawa potential can be shown in Equation (50). The result of un-normalized wave function equation for Mobius square plus modified Yukawa potential can be shown in Table 1.
Effects Of Employee Motivation On Organizational Performance At Ethiopian Telecom South West Region Jimma
Authors: Wolde  , Negash Eminent , Asmare Aregu , Eshete Shimekit Kelkay
Published: July 2021

The study examined the effects of employee motivation on organization performance of crews in Ethio telecom South West Region Jimma. The data were collected through self-administered questionnaire from 229 respondents and 219 were returned.  Both primary and secondary sources of data were consumed in this study. The quantitative research approach was implemented and simple random sampling technics were adopted to provide equal chances for respondents. The data were analyzed by SPSS version 20.0 using an exploratory research design and data was analyzed using correlation and regression analysis. The correlation analysis indicates that there was a positive relationship between the independent variables (employee motivation) and dependent variables (organization performance). The result of the regression implies that the independent variables (employee benefit, promotion, teamwork, training and working environment) have accounted for 78.1% of variance in the dependent variable. Based on the outcome of the study, the researchers recommend that, it is better if the company focuses on employee motivation factors, mostly Promotion, employee benefit, teamwork and training so as to improve its performance.
Influence Analysis Of Forced Distribution Rating Performance Appraisal And Merit Pay To Performance Of Directorate General Of Taxes’s Employees With Job Satisfaction As Intervening Variable At Blora Tax Service Office
Authors: - Sigit Fadhil Rais , Mirwan Surya Perdhana  , Zainur Hidayah
Published: July 2021

This study aims to analyze and determine influence of forced distribution rating performance appraisal and merit pay toward performance of Directorate General of Taxes’s employees with job satisfaction as intervening variable at Blora Tax Service Office. Technique used for this study is census then data analyzed with SmartPLS. This research’s subjects are 80 low management employees at Blora Tax Service Office. The result of this research shows that forced distribution rating performance appraisal and merit pay don’t affect directly on employee’s performance. But forced distribution rating performance appraisal and merit pay have positive and significant effect on job satisfaction while job satisfaction has positive and significant effect on performance. Then indirectly through job satisfaction, forced distribution rating performance appraisal and merit pay have positive and significant effect to employee’s performance. This result shows that job satisfaction is a  suitable intervening variable for this research. Based on this research, it is suggested for future managerial policy with goal to increase performance, job satisfaction should be one of deciding factors.
Design optimisation of a wireless sensor node using a temperature-based test plan
Authors: Ciani Lorenzo , Catelani Marcantonio , Bartolini Alessandro , Guidi Giulia , Patrizi Gabriele
Published: July 2021

The introduction of Big Data and Internet of Things has allowed the rapid development of smart farming technologies. Usually, systems implemented in smart farms monitor environmental conditions and soil parameter to improve productivity, to optimize soil conservation, to save water and to limit plant diseases. Wireless sensor networks are a widespread solution because they allow to implement effective and efficient crop monitoring. At the same time, wireless sensor networks can cover large area, they can ensure fault tolerance and they can acquire large amount of data. Recent literature misses to consider the testing of the hardware performances of such systems according to the actual operating conditions. The effects of a harsh environment on the dynamic metrological performances of sensor nodes are not sufficiently investigated. Consequently, this work deals with the electrical design optimization of a sensor node by means of thermal test used to reproduce the actual operating conditions of the nodes. The results of the node characterization through thermal tests are used to improve the node’s design and consequently to achieve higher performances in harsh operative conditions.
An Innovative Correction Method of Wind Speed for Efficiency Evaluation of Wind Turbines
Authors: Carullo Alessio , Ciocia Alessandro , Malgaroli Gabriele , Spertino Filippo
Published: July 2021

The performance of horizontal axis Wind Turbines (WTs) is strongly affected by the wind speed entering in their rotor. Generally, this quantity is not available, because the wind speed is measured on the nacelle behind the turbine rotor, providing a lower value. Therefore, two correction methods are usually employed, requiring two input quantities: the wind speed on the back of the turbine nacelle and the wind speed measured by a meteorological mast close to the turbines under analysis. However, the presence of this station in wind farms is rare and the number of WTs in the wind farm is high. This paper proposes an innovative correction, named “Statistical Method” (SM), that evaluates the efficiency of WTs by estimating the wind speed entering in the WTs rotor. This method relies on the manufacturer power curve and the data measured by the WT anemometer only, thus having the possibility to be also applied in wind farms without a meteorological station. The effectiveness of such a method is discussed by comparing the results obtained by the standard methods implemented on two turbines (rated power = 1.5 MW and 2.5 MW) of a wind power plant (nominal power = 80 MW) in Southern Italy.
Bias-induced impedance effect of the current-carrying conductors
Authors: Baltianski Sioma
Published: July 2021

The paper presents the previously unstudied properties of current-carrying conductors utilising impedance spectroscopy. The purpose of the article is to present discovered properties that are the significant context of impedance research. The methodology is based on the superposition of test signals and bias affecting the objects under study. These are the main results obtained in this work: the studied objects have an additional low-frequency impedance during the passage of an electric current; the bias-induced impedance effect (ZBI-effect) is noticeably manifested in the range of 0.01 Hz … 100 Hz and it has either capacitive or inductive nature or both types, depending on the bias level (current density) and material types. The experiments in this work were done using open and covered wires made of pure metals, alloys, and non-metal conductors, such as graphite rods. These objects showed the ZBI-effect that distinguishes them from other objects, such as standard resistors of the same rating, in which this phenomenon does not occur. The ZBI-effect was modeled by equivalent circuits. Particular attention is paid to assessing the consistency of experimental data. Understanding the nature of this effect can give impetus to the development of a new type of instrument in various fields.
Are learning preferences really a myth? Exploring the mapping between study approaches and mode of learning preferences
Authors: Fitkov-Norris Elena , Yeghiazarian Ara
Published: July 2021

This article tested for the presence of the conversion effect in the mapping related to the strength of students’ preferences for receiving information in a visual, auditory, read/write or kinaesthetic modality and the study approaches they adopt when taking notes in class, learning new concepts and revising for exams. The results indicated that the conversion effect is not ubiquitous but is context specific and only present when students seek to learn a new concept and revise for exams. It was present for students with strong visual and read/write preferences but only when attempting to learn a new concept. It was also present for students with a strong auditory preference when revising for exams, while these students preferred to learn a new concept by reading about it. However, the conversion effect did not emerge with kinaesthetic-leaning students in any of the contexts studied, while these students were significantly more likely to utilise auditory input when learning a new concept. Overall, the findings suggest that traditional educational approaches such as lectures and tutorials can be effective in supporting the learning for diverse student groups.
Sensors-based mobile robot for harsh environments: functionalities, energy consumption analysis and characterization
Authors: De Fazio Roberto , Katamba Dany Mpoi , Lay Ekuakille Aimè , Ferreira Miguel Joseph , Kidiamboko Simon , Giannoccaro Nicola Ivan , Velazquez Ramiro , Visconti Paolo
Published: July 2021

Mobile robots and rovers play an important role in many industrial applications. Under certain constraints, they are suitable in harsh environments and conditions in which protracted human activity is not safe or permitted. In many circumstances, mechanical aspects and electrical consumption need to be optimized for autonomous and wheeled mobile robots. The paper illustrates the design of a semi-custom wheeled mobile robot with high-efficiency mono- or polycrystalline photovoltaic panel on the roof that supports the lithium ion batteries during particular tasks (e.g. navigating rough terrain, obstacles or steep paths) to extend the robot’s autonomy. An electronic controller was designed, and data acquisition related to power consumption performed using a specific experimental setup. The robot can detect parameters such as temperature, humidity, concentrations of toxic gas species and the presence of flames, making it particularly suitable for contaminated environments or industrial plants. For this aim, the mobile robot was equipped with a wide range of commercial sensors and a Global Positioning System receiver to track its position. In addition, using an HC-06 Bluetooth transceiver, the robot receives commands and instructions, and sends the acquired data to the developed IoTool smartphone application, where they are displayed to be analysed by user.
Metrological characterisation of current transformers calibration unit for accurate measurement
Authors: Isaiev Valentyn , Velychko Oleh
Published: July 2021

The manuscript presents a method for the metrological characterisation of the commercial AC comparators used to calibrate current transformers. The theoretical basis for simulating the difference between two almost identical currents has been outlined, as well as the mathematical models for both a ratio error and a phase displacement has been derived. The measurement setup, consisting of conventional measuring instruments, has been described with a detailed presentation of its parameters. The sources of uncertainty have been distinguished and analysed with determining the current phase shift which led to a significant increase of relative measurement uncertainty. The simulation of measurement results was yielded in two ways: physically using a method presented and virtually using a Monte Carlo method. The second method confirmed that evaluating the measurement uncertainty through derived sensitivity coefficients is correct enough. The simulation results in the range from 1 to 1200 parts per million for both ratio error and phase displacement motivated the use of a comparator characterised through the proposed method for accurate measurement, especially for very low errors.
Dimensional analysis of structural response in complex biological structures
Authors: Patel Reena , Thompson David , Riveros Guillermo , Hodo Wayne , Peters John , Acosta Felipe
Published: July 2021

The solution to many engineering problems is obtained through the combination of analytical, computational and experimental methods. In many cases, cost or size constraints limit testing of full-scale articles. Similitude allows observations made in the laboratory to be used to extrapolate the behavior to full-scale system by establishing relationships between the results obtained in a scaled experiment and those anticipated for the full-scale prototype. This paper describes the application of the Buckingham Pi theorem to develop a set of non-dimensional parameters that are appropriate for describing the problem of a distributed load applied to the rostrum of the paddlefish. This problem is of interest because previous research has demonstrated that the rostrum is a very efficient structural system. The ultimate goal is to estimate the response of a complex, bio-inspired structure based on the rostrum to blast load. The derived similitude laws are verified through a series of numerical experiments having a maximum error of 3.39%.
ОРГАНИЗАЦИОННО-ЭКОНОМИЧЕСКИЙ МЕХАНИЗМ ИСПОЛЬЗОВАНИЯ ПОДЗЕМНЫХ ВОД В РЕСПУБЛИКЕ БЕЛАРУСЬ
Authors: СКВОРЦОВА Е.
Published: July 2021

Статья посвящена анализу сложившегося в Республике Беларусь организационно-экономического механизма использования подземных вод. Оценка механизма произведена по ключевым направлениям применения пресной и минеральной воды: разведка, добыча и потребление. Выявлены основные проблемы эксплуатации подземных вод в разрезе исследуемых направлений, предложены концептуальные положения совершенствовании организационно-экономического механизма использования подземных вод Республики Беларусь.
СТРАТЕГИИ РАЗВИТИЯ ТРАНСПОРТНЫХ УСЛУГ САНКТ – ПЕТЕРБУРГА И ЛЕНИНГРАДСКОЙ ОБЛАСТИ.
Authors: СОБОЛЕВА И.
Published: July 2021

В статье предлагается анализ рынка транспортных услуг РФ и Санкт- Петербурга. Исследованы динамика объектов и процессов рынка, изменения структуры и тренды развития транспорта РФ, ТЛК Санкт- Петербурга. Установлены наиболее вероятные риски и проблемы. Предлагаются стратегии развития бизнеса на рынке транспортных услуг региона.
ПЕРСПЕКТИВЫ И МЕХАНИЗМЫ РАЗВИТИЯ И КАПИТАЛИЗАЦИИ СОЦИАЛЬНОГО ПОТЕНЦИАЛА РЕСПУБЛИКИ БЕЛАРУСЬ
Authors: СОЛОДОВНИКОВ С.
Published: July 2021

Установлено, что специфическим свойством социального капитала является то, что совокупное количество «социального капитала» в обществе не является суммой «социальных капиталов» всех его субъектов. Это происходит не только потому, что существуют некоторые проявления социального капитала только на уровне всего социума, но и потому, что этот капитал может использоваться не только в продукционных целях, но и с целью эгональной оптимизации своей социально-экономической жизненности, что вступает в противоречие с интересами других классов и групп, государства и социума. Разработаны механизмы новой стратегии развития и капитализации социального потенциала Республики Беларусь.
МЕЖДУ СОЦИАЛИСТИЧЕСКИМ ПРЕДПРИЯТИЕМ И РЫНОЧНОЙ ФИРМОЙ: БЕЛОРУССКИЕ ПОВ - ПРЕДПРИЯТИЯ, ОРИЕНТИРОВАННЫЕ НА ВЫЖИВАНИЕ.
Authors: ВАСЮЧЕНОК Л.
Published: July 2021

Статья посвящена эволюции белорусских предприятий. На основе синтеза неоклассического, институционального и эволюционного подходов показано, что предприятие является воплощением специфической производительной силы обособленной экономической организации, не сводимой ни к рынку, ни к плану. Сформулирован парадокс: в неоклассической теории и в политической экономии социализма предприятие - производственная функция. Определена специфика социалистического предприятия, особенности белорусских советских предприятий, описано превращение белорусского советского предприятия в устойчивую переходную форму - предприятие, ориентированное на выживание - ПОВ, феномен которой стал вызовом экономической теории.
Downhole Annular Barrier Solution for Sustained Casing Pressure - Trinidad Case Study
Authors: Olsen Jonathan Eugen , Hosein Wayne , Ringe Thomas , Friedli John David
Published: July 2021

Objectives/Scope

Downhole Annular Barrier (DAB) systems employed in intervention can correct integrity and conformance control issues during well lifecycle, extending the productive term in a safe and costeffective manner. These emergent wireline technologies come with unique challenges for logistics, quality control, and engineering, but can also provide solutions to difficult problems, with high value to spend ratio, in the non-rig intervention sector. The paper will review one such successful intervention, completed offshore Trinidad W.I., in a gas well presenting long term Sustained Casing Pressure (SCP). The desired end state of the well was A-Annulus at 0 psi SCP, which would return the well to a safe state and permit a planned infrastructure project to move ahead.

Methods, Procedures, Process

Operational objective was isolation of the casing annulus pressure from the source by injecting epoxy into the annular space at depth, forming a 360-degree pressure barrier. The project can be broken down into three main sections. The paper and presentation will address each section with its specific challenges, learnings, and outcomes: Onshore Epoxy and Tool Preparation Each Downhole Annular Barrier job employs a custom recipe epoxy suited to the planned logistics timing and expected bottomhole conditions. Quality control of the epoxy recipe and mixing process as well as temperature control of the batch after mixing is key to the sealing properties of the final epoxy plug. • An Epoxy Lab and Mixing Station was dismantled, air freighted, and reconstituted in Trinidad near to the field operations port. Special insulated offshore CCU were built to transport and contain filled epoxy canisters while maintaining low temperature requirements (near to 0 deg C for up to 30 days). • Build and System Integration Testing (SIT) of the downhole system (anchoring, stroking, hydraulic testing, perforation, and injection) with the electric line system (conveyance, telemetry, power). Offshore Job Execution The DAB system employed is designed to complete multiple operations in a single trip into the well, including perforating and high-pressure epoxy injection, with precise position control and monitoring. This is made possible with the multi-function modular tool. The operation was dynamic by design and contingencies were implemented based on the well response. Multiple epoxy annular plugs were placed into the A Annulus at depth, with high pressure injection.

Results, Observations, Conclusions

Well Response and Assessment Utilizing advanced annular surface monitoring technology and PvT analysis, precise assessment of the annulus pressure build was recorded throughout the operation. Once the project criteria were met, the operation was successfully concluded.
Not In My Backyard: The impact of waste disposal sites on communities in Jordan
Authors: Taher Raya , Abu Safe Farah , Perrin Jean-Patrick
Published: July 2021

Waste disposal sites across Jordan pose serious risks to the environment and to public health if not managed safely. Municipal waste decomposing in open landfills also takes an environmental and socio-economic toll on neighbouring communities. While the Government of Jordan is planning to reduce the number of operational landfills and improve waste management services, persistent issues associated with unsustainable waste practices and their associated effects on the wellbeing of surrounding communities and the environment need to be addressed. Guaranteeing a sustainable waste management scheme for communities in Jordan should include increased consideration of the long-term effects that waste disposal sites have on neighbouring communities.
Experimental Study of Crushed Granular Materials by the Notion of Fractal Dimension in 2D and 3D.
Authors: BOUZEBOUDJA Houria , MELBOUCI Bachir , BOUZEBOUDJA Aldjia
Published: July 2021

The micro-texture of the aggregates of a pavement layer has a direct influence on their resistance. Whatever the position of these aggregates in a pavement structure, they must withstand, during construction or during life, the stresses of attrition and impact. In this study, a series of mechanical tests (Proctor, Los-Angeles and Micro-Deval) are carried out on grains of local materials (limestone and shale), the degree of crushing of the grains has been quantified using the concept of fractal dimension. The fractal dimension was calculated for the different grains constituting the samples before and after each test, with the use of two two-dimensional 2D methods (Masses Method at the scale of a sample and the Box Counting Method at the scale of a grain) and a three-dimensional 3D method (Blanket on a grain scale) which is based on the use of the difference between erosion and dilation. We seek to determine from these methods the correlation between the two fractal dimensions, namely 2D and 3D and study the influence of different parameters on the mechanical characteristics of the materials chosen: the shape and size of the grains, the presence or absence of water, the stress intensity as well as the nature of the material. The results obtained show that the three-dimensional method has a positive effect on the description of the 3D microstructure of the surface of the grains subjected to the various mechanical tests.
Product Demand Forecasting in Ecommerce Based on Nonlinear Autoregressive Neural Network
Authors: Wu Peijian , Chen Yulu
Published: July 2021

With the rapid growth of the e-commerce business scale, to meet customers' demand for efficient order processing, it is of great significance to establish an order management mechanism capable of responding quickly by accurately predicting product demand. This study used real e-commerce order demand data and established a nonlinear autoregressive neural network (NAR) model after pre-processing methods including down-sampling and data set partition to effectively forecast the demand of products in the next 13 weeks. Compared with the Prophet time series prediction framework, NAR had better generalization ability, and the prediction time was reduced by 18.54%. Finally, we summarized two methods' characteristics and gave instructions on applying our model in the real scene. After being deployed in the actual demand management, the trained artificial neural network provides a scientific reference for the data-driven e-commerce decision-making process and brings new advantages over other companies, achieving the rational allocation of resources.
Nonlinear Methods to Quantify Movement Variability in Human-Humanoid Interaction Activities
Authors: Xochicale Miguel , Baber Chris
Published: July 2021

Human movement variability arises from the process of mastering redundant (bio)mechanical degrees of freedom to successfully accomplish any given motor task where stability and flexibility of many possible joint combinations helps to adapt to environment conditions. While the analysis of movement of variability is becoming increasingly useful as a diagnostic tool or skill performance evaluation, there are remain challenges on applying the most appropriate methods for their quantification. We therefore investigate reconstructed state space (RSSs), uniform time-delay embedding, recurrence plots (RPs) and recurrence quantification analysis (RQAs) with real-world time-series data of wearable inertial sensors. To which twenty healthy participants imitated vertical and horizontal arm movements in normal and faster velocity from an humanoid robot. We applied RSSs, RPs and RQAs to the time-series data to found visual differences in the patterns of RSSs and RPs and statistical differences with RQAs. We conclude that RQA with Shannon Entropy is a suitable method to quantify activities, types of sensors, windows lengths and level of smoothness. Hence this work might enhance the development of better diagnostic tools for applications in new forms of human-humanoid interaction for quantification of movement adaptations and motor pathologies or rehabilitation and sport science for skill performance.
Cardiac Resynchronization Therapy Using Left-bundle-branch Area Pacing and Coronary Sinus Pacing
Authors: Feng Xiang-Fei , Zhang Rui , Yu Yi-Chi , Liu Bo , Han Ya-Qin , Lu Qiu-Fen , Li Yi-Gang
Published: July 2021

Background: Cardiac resynchronization therapy via biventricular pacing (BVP) is an established therapy for patients with heart failure. Recently, it has been shown that left bundle branch area pacing (LBBAP) is feasible and may also improve clinical outcomes. In this article, we describe a new technique (sequential LBBAP followed by coronary sinus pacing, designated LOT-CRT) and assess the feasibility of LOT-CRT.Methods: The database of all patients with adaptive CRT from single centre was reviewed retrospectively. The eligible patients were divided into two groups, LOT-CRT and BV-CRT. The LBBAP lead implanted using our methods. The QRS duration (QRSd) was measured at baseline and during LBBAP, BVP, and LOT-CRT.Results: The study enrolled 17 consecutive heart failure patients with LBBB. LBBAP failed in 1 patient, succeed in 8 patients, while CS leads were implanted successfully in all patients. At baseline, the two groups (8 cases in LOT-CRT group, 9 cases in BV-CRT group) were matched for QRSd and ischemic cardiomyopathy (ICM, 5 cases in LOT-CRT group, 4 cases in BV-CRT group). In LOT-CRT group, BVP resulted in significant reduction of the QRSd from 158.0 ± 13.0 ms at baseline to 132.0 ± 4.5 ms (P=0.019). Compared with BVP, unipolar LBBAP resulted in further reduction of the QRSd to 123.0 ± 5.7 ms (P < 0.01). However, LOT-CRT with adaptive algorithm resulted in a significantly greater reduction of the QRSd to 117.0 ± 6.7 ms (P < 0.01). In BV-CRT group, BVP resulted in significant reduction of the QRSd from 176.7 ±19.7 ms at baseline to 143.3 ±8.2 ms (P=0.011). However, compared with LOT-CRT, BVP has no any advantage in reducing QRSd (P >0.05). As compared to the baseline after 3 months of LBBAP, patients in LOT-CRT group showed significant improvement in LVEF and NT-proBNP levels (P < 0.01), while patients in BV-CRT group showed non-significant changes in these parameters (P >0.05).Conclusions: The study demonstrates that LOT-CRT is clinically feasible in patients with systolic HF and LBBB. LOT-CRT was associated with significant narrowing of the QRSd and improvement in LV function, especially in patients with ICM.
An Efficient Compression of Gray Scale Images using Wavelet Transform
Authors: RANJAN RAJIV , Kumar Prabhat
Published: July 2021

The rapid development of technology and the standardization of digital photography have led to an explosive growth in digital image distribution and reproduction. The enhancement of storage capacity in computer disks and advancement in networking have not been able to keep pace with the demands of handling, storing and finally transmitting huge volume of image data. Only proper image compression technologies seem to offer a solution to this challenge. The importance of digital image compression in multimedia applications has inspired extensive research all over the world. The present study recommends a newly formulated algorithm by computing Discrete Wavelet Transform (DWT) in combination with thresholding and quadtree decomposition. Findings prove that the proposed technique is at par with EZW image compression algorithm in terms of quality performance at the same bit rate, and obviates the need for employing any other conventional standard image compression techniques.
Hidden Blood Loss in Percutaneous Endoscopic Lumbar Discectomy (PELD): A Prospective Study
Authors: Chen Chong , Xiao Dan , Gu Honglin , Liang Guoyan , Zhang Ruiying , Zheng Xiaoqing , Liang Changxiang , Chang Yunbing
Published: July 2021

Background: Percutaneous endoscopic lumbar discectomy (PELD) is a minimally invasive technique for treatment of lumbar disc herniation (LDH) that requires only an eight-mm skin incision and promotes faster recovery. It is widely believed that the procedure is associated with minimal blood loss. However, significant perioperative hidden blood loss (HBL) is frequently unaccounted for. This study aimed to investigate HBL and peri-operative factors contributing to HBL in a series of individuals undergoing PELD.Methods: As a prospective observational study, 156 patients, mean age 41.6 years (ranged from 17 to 71), undergoing PELD were finally enrolled between May 2019 and November 2020. The analyzed factors included gender, age, body mass index (BMI), symptom duration, operation approach/technique, operation duration, the presence of associated chronic diseases (e.g., hypertension, rheumatoid arthritis, and diabetes mellitus), and improvements in Visual Analog Scale (VAS), Japanese Orthopedic Association (JOA), and Oswestry Disability Index (ODI) scores. Gross’s formula was applied to calculate blood loss from recorded values for patient height, weight, and hematocrit levels before and after surgery. Multivariate linear regression analysis and t test were performed to identify factors that contributed significantly to HBL.Results: The mean HBL during PELD was 201 ± 126 mL, and the Hb reduction observed post-operatively was 7.4 ± 4.5 g/L. A lateral surgical approach was associated with greater HBL compared with an interlaminar approach. However, no significant differences in VAS, JOA, and ODI score improvements were noted between the two surgical approaches. Increased surgical times and foraminal decompression were identified by multivariate linear regression analysis as linked to increased HBL. As expected, the occurrence of post-operative anemia was significantly associated with HBL. Age, gender, BMI, symptom duration, and associated chronic diseases showed no association with increased HBL during PELD. Conclusions: HBL is increased in PELD patients with long surgical times and lumbar foraminal decompression.
Immediate Effect of Manual Therapy Techniques on the Limitation of Ankle Dorsiflexion: A Randomized, Controlled, Double-Blind Clinical Trial Protocol
Authors: Silva Matheus de Castro , Baldon Rodrigo de Marche , Lins Carolina , de Andrade Gustavo Martins , de Castro Gustavo Barros Braga , Felicio Lilian Ramiro
Published: July 2021

Background: The range of motion (RoM) of dorsiflexion (DF) plays an important role in human mobility, such as absorption of body weight during gait deceleration, jump landings, balance and eccentric movements. This limitation can generate potentially damaging movements. This way, evaluating techniques for DF RoM increase could help improve immediate performance in such functional activities. This being the case, the objective of this study will be to verify the sum effect of different joint mobilization techniques for DF gain in persons practicing physical activities and its relationship with functional performance and balance. Methodology: This is a randomized, controlled and double-blind clinical trial. Sixty-four (64) volunteers will be recruited, aged between 18 and 40 years, who have DF limitation. After checking eligibility criteria, the participants will be submitted to a physiotherapeutic evaluation. Volunteers will be evaluated as to a DF for open kinetic chain (OKC) and closed kinetic chain (CKC), and also submitted to functional Y Balance Test under a force platform and Triple Hop Test, by a blind examiner. Another researcher, also blind, will perform the randomization of patients in groups: (A) Joint Mobilization - Mulligan Concept and (B) Joint Mobilization - Maitland Method. After the randomization, volunteers will be submitted to initial evaluation (A0) and, after 2-3 days, they will be submitted to application of the techniques, which will be randomized, and reassessed immediately (A1). After 3-4 days of the application of the techniques, the re-evaluation will be performed (A2). Discussion: It is already known that DF RoM limitation can lead to compensatory and potentially damaging lower limb movements and that joint mobilizations are effective to treatment. However, there is no consensus whether the application of these techniques would also improve aspects of dynamic postural balance and performance in individuals practicing physical activity, and whether the sum of two joint mobilization techniques could enhance this effect. Trial registration: RBR-93xv9t, Registered 09 April 2020, https://ensaiosclinicos.gov.br/rg/RBR-93xv9t.
Role of Jasmonic and Salicylic Acid on Enzymatic Changes in the Root of Two Alyssum Inflatum Náyr. Populations Exposed to Nickel Toxicity
Authors: Kakavand Shiva - Najafi , Karimi Naser - , Ghasempour Hamid-Reza - , Raza Ali - , Chaichi Mehrdad - , Modarresi Masoud -
Published: July 2021

Salicylic acid (SA) and jasmonic acid (JA) as plant growth regulators (PGRs) have the potential to ameliorate plant development and tolerance to deleterious effects of toxic metals like nickel (Ni). Therefore, the current study was carried out to evaluate SA and JA's interactive effect on the root antioxidative response of two Alyssum inflatum Nyár. populations against Ni-toxicity. Two A. inflatum species under Ni-stress conditions (0, 100, 200, and 400 µM) were exposed to alone or combined levels of SA (0, 50, and 200 µM) and JA (0, 5, and 10 µM) treatments. Results showed that high Ni doses reduced the roots fresh weight (FW) in two populations than control; however, the use of external PGRs had ameliorated roots biomass by mitigated Ni-toxicity. Under Ni toxicity, SA and JA, especially their combination, induced high Ni accumulation in plants' roots. Moreover, the application of SA and JA alone, as well as combined SA + JA, was found to be effective in the scavenging of hydrogen peroxide (H2O2) by improving the activity of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), and ascorbate peroxidase (APX) in both populations under Ni-toxicity. Overall, our results manifest that SA and JA's external use, especially combined SA + JA treatments, ameliorate root biomass and plant tolerance by restricting translocation Ni to the shoot, accumulating in roots, and also enhancing antioxidant defense systems.