bluuebunny/crossref_metadata_2025 huggingface dataset:
Dual-phase contrast-enhanced multislice computed tomography scans play a key role in the diagnosis of abdominal wall desmoid-type fibromatoses
Authors: Li Shengkai , Yuan Xiaodan , Yi Zhijun , Dai Haiyang , Yang Lin , Dai Zhuozhi , Yan Gen
Published: April 2023

BACKGROUND: Abdominal wall desmoid-type fibromatoses (AWDF) are occasionally encountered in clinical work, but related CT reports are rare, and most cases were misdiagnosed as malignant tumors. OBJECTIVE: We aimed to determine the diagnostic value of multislice computed tomography (MSCT) in relation to the clinical diagnosis of AWDF. METHODS: The medical records of 14 patients whose pathology results provided initial confirmation of AWDF were reviewed, and data describing their clinical characteristics, tumors’ MSCT characteristics, and the condition of the surrounding tissues were analyzed and summarized retrospectively. Intraobserver and interobserver reproducibilities were evaluated. RESULTS: AWDF tended to occur in women of childbearing age (24–32 years). They occurred more frequently during the first year following pregnancy. The mean disease duration was 5.64 ± 3.78 months. All isolated tumors were growing along the musculoaponeurotic layer, and their maximum diameters were between 32 and 76 mm. Tumors’ capsules were incomplete, and although the tumors infiltrated the surrounding muscles, the surrounding fat tissue and vessels were not infiltrated. None of the patients’ tumors showed cystic degeneration, calcification, necrosis, or peritumoral edema. The tumors had slightly lower densities on the pre-contrast enhancement scans and mild-to-moderate enhancement after contrast enhancement. All tumors contained ribbon-like structures, and approximately 65% of the tumors encircled vascular structures. CONCLUSION: Dual-phase contrast-enhanced MSCT scans were associated with a high level of diagnostic efficacy for AWDF. The abdominal wall masses grew along the musculoaponeurotic layer, which, together with the ribbon-like structures within the tumors, should prompt clinicians to consider the presence of AWDF.
Secured computed tomography scanner using a random bit
Authors: Choi Hojong , Shin Seung-Hyeok
Published: April 2023

BACKGROUND: Patient data in current computed tomography scanner machines are transferred through several communication channels, such as WiFi, to the mobile channel platform. Therefore, patient information is an important security concern. Medical imaging must be protected using various methods. OBJECTIVE: The current hardware-dependent method for generating random bits exhibits predictable or inconvenient physical characteristics. Therefore, a more flexible random-bit generation technique is to be devised. METHODS: We propose a deterministic random bit generation algorithm that uses a mathematical periodic function. RESULTS: After randomizing the image using the proposed random bit, the performance is analyzed and compared with that of the processed image. CONCLUSION: The random bit generation method using a mathematical algorithm shows higher entropy than the random bit generated by hardware.
Assessment of the risk of unexplained recurrent spontaneous abortion based on the proportion and correlation of NK cells and T cells in peripheral blood
Authors: Du Mengxuan , Li Yanqiu , Gu Heng , Gao Mengge , Xu Hang , Zhong Wenyao , Liu Xiaohua , Zhong Xingming
Published: April 2023

BACKGROUND: Unexplained recurrent spontaneous abortion (URSA) is difficult to diagnose and treat clinically due to its unknown cause OBJECTIVE: Changes in natural killer (NK) cells, T lymphocytes, and Th1(IFNγ)/Th2(IL-4) cytokines were investigated in the peripheral blood of patients with URSA to examine the pathogenesis, clinical diagnosis, and inform potential treatment strategies for this condition. METHODS: For this study, we selected patients with URSA as the case group and included normal women in the control group. Flow cytometry was performed to detect lymphocytes and cytokines in the peripheral blood of all subjects. RESULTS: The proportion of NK cells, Th1 cells, and the Th1/Th2 ratio were significantly higher in the URSA group compared to the control group; whereas the proportion of CD3+T cells was lower. Pairwise correlation analysis revealed a positive correlation between the percentage of NK cells and CD3+T cells, as well as CD3+CD4+T cells. Canonical correlation analysis indicated a significant correlation between NK cells and T cells, including their subgroups. CONCLUSION: Patients with URSA have immune balance disorders, characterised by an increased proportion of peripheral blood NK cells, Th1, and Th1/Th2 ratio along with a decreased proportion of CD3+T cells. The proportion of NK cells and CD3+T may serve as predictive factors for URSA, while NK cells are closely related to the regulation of CD3+T cells and their subsets. By regulating the level of IFN-γ, NK cells can influence the proportion of CD3+T cells and induce a Th1 (IFNγ)/Th2 (IL-4) imbalance.
Effects of Prunus Tomentosa Thumb Total Flavones on adjuvant arthritis in rats and regulation of autophagy
Authors: Chen Xi , Sun Lijuan , Wang Shuang , Wang Yilin , Zhou Yue , Li Yan , Cheng Zihao , Wang Yingying , Jiang Yanan , Zhao Zihan , Xv Yawei , Zhang Chengyi
Published: April 2023

BACKGROUND: Rheumatoid arthritis (RA) is a slow in taking effect systemic autoimmune disease. Prunus Tomentosa Thumb Total Flavones (PTTTF) has anti-inflammatory and antioxidant properties. OBJECTIVE: The purpose of this study is to the PTTTF on adjuvant arthritis (AA) in rats and to explore the mechanism of autophagy. METHODS: Adjuvant arthritis model was established in rats. The cyclooxygenase 1 (COX-1) and cyclooxygenase 2 (COX-2), interleukin-1β (IL-1β), interleukin-6 (IL-6), interleukin-17 (IL-17), tumor necrosis factor (TNF-α) of rat synovial tissue were determined by RT-PCR. The histopathological varieties of knee joints in AA rats were observed by HE staining. The expressions of autophagy-related proteins ATG5, ATG7, ATG12, Beclin1, Lc3II and Bcl-2 in rat synovial tissue were determined by Western Blotting. RESULTS: PTTTF (50, 100, 200 mg/kg) significantly inhibited inflammation in rats (P< 0.01). PTTTF significantly inhibited inflammatory factor COX in rat synovial tissue. COX-2, IL-1β, IL-6, IL-17, TNF-α expression (P< 0.05); PTTTF can significantly improve the pathological damage of rat knee joint PTTTF and can significantly inhibited the expression of autophagy-related proteins in rat synovium (P< 0.05 ). CONCLUSION: PTTTF can inhibit adjuvant arthritis in rats and can inhibit the expression of autophagy-related proteins ATG5, ATG7, ATG12, Beclin1, Lc3II and Bcl-2.
Assessment of the potential value of combining western medicine therapies with traditional chinese medicine in the treatment of COVID-19: Mechanistic perspectives
Authors: Zeng Zirui
Published: April 2023

BACKGROUND: The pandemic caused by the novel coronavirus disease (COVID-19) since early 2020 is one of the most significant global health issues in history. Although there is currently no specific treatment for COVID-19, researchers have provided a whole array of potential treatments, both from the Western medicine approach, which is molecular target and pathogenesis based, and from the traditional Chinese medicine (TCM) approach, which is based on the exposure to toxins/pathogens and the balance of the body to combat them for recovery. OBJECTIVE: The aim of this research is to find combinations of Western medicine and TCM that may offer better therapeutic efficacy synergystically with a better adverse events profile. The findings of the research may provide a new insight in the development of the treatment of COVID-19. METHODS: From the Western medicine perspective, drugs target the mechanisms of viral infection, including the stages of viral entry (Arbidol, Camostat Mesylate, Convalescent Plasma therapy) and viral replication (Lopinavir/Ritonavir, Redemsivir, Ribavirin). Additional therapies target host defenses, preventing cytokine storms (Tocilizumab) and stimulating the immune system (Interferons). On the other hand, TCM also proposed a number of treatment methods for COVID-19 with new scientific approaches identifying their antiviral and immunomodulatory activities. The novel combination of Western medicine and TCM can be proposed by analyzing their respective molecular targets. RESULTS: Although TCM is not generally accepted in the Western community because of the general lack of knowledge on their detailed mechanisms, studies and clinical trials suggest that TCM could be beneficial in combating COVID-19. CONCLUSION: Based on the principle of combining TCM and Western medicine, two combinations are tested effective in clinical trials, and three possible combinations that might be effective are proposed in the paper.
A super-selective coil impregnation therapy for pancreatic duct haemorrhage caused by pseudoaneurysm rupture
Authors: Liu Xiangbo , Chen Songsen , Yang Guangming , Hong Jianfu , Lin Yanfang , Lin Zhong , Zhang Yuling , Chiang Tung-Ying
Published: April 2023

BACKGROUND: Haemorrhage of pancreas is a rare cause of upper gastrointestinal bleeding, and currently there is no clinical satisfactory treatment for this disorder. OBIECTIVE: The present study envisaged to treat the haemorrhage of pancreas caused by pseudoaneurysm rupture using interventional super-selective coil impregnation therapy, so as to achieve a better treatment efficacy. METHODS: Six cases presenting haemorrhage of pancreas were employed for the study, including 5 cases caused by splenic artery pseudoaneurysm and 1 case caused by superior pancreatic artery pseudoaneurysm. In all 6 patients the femoral artery was punctured using Seldinger femoral artery puncture and intubation technique. Subsequently, a catheter was inserted into the abdominal trunk and the contrast medium was injected, and the pseudoaneurysm was developed. A coil was then inserted into the distal end and proximal end of the pseudoaneurysm, respectively, leading to the elimination of the pseudoaneurysm. RESULTS: All 6 patients with pancreatic haemorrhage were implanted with coil at the distal and proximal end of the aneurysm, until the aneurysm disappeared during intraoperative angiography. Further, clinical symptoms such as abdominal pain, melena and hematemesis disappeared after the operation. No recurrence of the symptoms was observed in the studied population. CONCLUSION: A 100% treatment outcome can be achieved in patients with pseudoaneurysm-induced haemorrhage of pancreas using interventional super-selective coil embolization.
Network pharmacology and experimental studies for deciphering the molecular targets and mechanisms of Chaihu Shugan powder in the treatment of functional dyspepsia
Authors: Wang Yujiao , Wang Xiangxiang , Jiang Kailin , Yang Keming , Ling Jianghong
Published: April 2023

BACKGROUND: Chaihu Shugan powder (CSP) is a prevalent prescription product used in the treatment functional dyspepsia (FD) in China. However, the underlying pharmacological mechanisms involved in the treatment of FD remain unclear. OBJECTIVE: To explore the key components of CSP and their molecular targets and mechanisms in the treatment of FD. METHODS: Active compounds for CSP were identified from the TCMSP and SymMap databases, and the relevant targets were predicted. FD-related targets were obtained from the GeneCards and CTD database. In addition, using the protein-protein interactions (PPI) analysis, the common targets were obtained. Furthermore, the compound-target networks were created with Cytoscape. Finally, molecular docking was performed to identify the core targets and validate them experimentally. RESULTS: In total, 78 active compounds and 671 related targets of CSP were obtained. PPI network analysis identified 15 key FD-related compound targets. Molecular docking revealed that sitosterol and hyndarin exhibited good binding activities with AKT1 and IL6, respectively. Animal experiments have shown that CSP effectively increased the protein levels of AKT1 and reduced the serum levels of IL-6 in FD rats. CONCLUSION: This study provides a theoretical evidence for the analysis of the molecular targets and mechanisms of the action of CSP in FD.
An efficient 3D reconstruction method based on WT-TV denoising for low-dose CT images
Authors: Liu Yaoyao , Wang Chang
Published: April 2023

BACKGROUND: In order to reduce the impact of CT radiation, low-dose CT is often used, but low-dose CT will bring more noise, affecting image quality and subsequent 3D reconstruction results. OBJECTIVE: The study presents a reconstruction method based on wavelet transform-total variation (WT-TV) for low-dose CT. METHODS: First, the low-dose CT images were denoised using WT and TV denoising methods. The WT method could preserve the features, and the TV method could preserve the edges and structures. Second, the two sets of denoised images were fused so that the features, edges, and structures could be preserved at the same time. Finally, FBP reconstruction was performed to obtain the final 3D reconstruction result. RESULTS: The results show that The WT-TV method can effectively denoise low-dose CT and improve the clarity and accuracy of 3D reconstruction models. CONCLUSION: Compared with other reconstruction methods, the proposed reconstruction method successfully addressed the issue of low-dose CT noising by further denoising the CT images before reconstruction. The denoising effect of low-dose CT images and the 3D reconstruction model were compared via experiments.
Medium and large alleles of the PGC gene are risk factors for gastric cancer
Authors: Sánchez-López Josefina Yoaly , Vázquez-Ibarra Katia Carolina , García-Muro Andrea Marlene , García-Ruvalcaba Azaria , Pacheco-Sotelo Sergio , Díaz-Herrera Luis Carlos , Marin-Contreras Marıa Eugenia
Published: April 2023

BACKGROUND:

A 100-bp insertion/deletion polymorphism in the pepsinogen C gene has been associated with the risk of gastric cancer (GC).

OBJECTIVE:

We analyzed the relationships of the 100-bp insertion/deletion polymorphism with GC, atrophic gastritis (AG), and intestinal metaplasia (IM) in the Mexican general population (MGP).

METHODS:

We studied the genomic DNA of subjects with GC n = 80, AG and IM n = 60, controls n = 110, and the MGP n = 97. PGC gene insertion/deletion polymorphism was identified by means of PCR, capillary electrophoresis and GeneScan software.

RESULTS:

Different allele sizes of PGC polymorphism were observed in the studied groups, from 266 bp to 499 bp, which were grouped for the analysis as short alleles of 266–399 bp, medium alleles of 400–433 bp and large alleles of 434–499 bp. Carriers of one or two medium alleles, had an increased risk of GC, with OR of 1.99 (CI95% 1.08–3.67 p = 0.026) compared to homozygotes (no medium/no medium).

CONCLUSIONS:

Previous studies have related PGC short alleles to risk for or protection against GC depending on the ethnic origin of the population. In our study, medium alleles were related to risk for GC. Further studies are required to establish the importance of this polymorphism in the origin of gastric neoplasia.
Balancing the bio in a biopsychosocial model of hazardous drinking and alcohol use disorders
Authors: Morris James , Boness Cassandra L. , Burton Robyn , Dar-Nimrod Ilan , Moss Antony
Published: April 2023

How alcohol problems are represented, including as ‘Alcohol Use Disorder’ (AUD), has a broad set of implications for research, policy and practice. A biopsychosocial approach is commonly offered as a means of taking into account the various environmental and individual level factors that may contribute to so called mental and behavioural disorders including AUD. In this reply we argue that the reference article presents a heavy focus on ‘bio’ factors without sufficiently acknowledging the potential costs of doing so, particularly that a focus on individual level ‘bio’ factors may undermine the utilization of effective environmental policy levers whilst potentially harming AUD recovery processes. Thus, we call for a more balanced focus on the ‘psychosocial’ factors related to AUD.
Food Intolerance and Sensitivity Are Associated With Chronic Musculoskeletal Pain in a Self-Selected Community Population
Authors: Thomson Ella , Beer Harriet , Ryan Laura , Philcox Edward , Kelly Clive
Published: April 2023

INTRODUCTION People are presenting with chronic musculoskeletal pain at a younger age, and many fulfil criteria for fibromyalgia. We have recently shown a strong association between fibromyalgia symptoms and autistic traits in a self-selected community population, with the relationship mediated in part by the presence of hypermobility. Many respondents also described food sensitivities and intolerances. This study explores the relationships between food issues and fibromyalgia symptoms in this population METHODS The study used a nonexperimental, correlational design with data collected from a volunteer sample of 442 adults (aged 18-60) who completed online self-report questionnaires assessing each of fibromyalgia symptoms (ACR criteria), autistic traits (RAADS score) and hypermobility (Beighton’s test). Subjects were also asked to record any food sensitivities, allergies, or intolerances, along with their consequences. Correlation analyses and linear regressions were used to test the relationships between these features and each of fibromyalgia, autistic traits and hypermobility. Data was analysed using parametric and non-parametric techniques to assess the strength and significance of relationships, and the potential mediating effect of food-related symptoms in the correlation between fibromyalgia features and autistic traits RESULTS Our self-selected community population had a mean age of 24 years and was 77% female. The prevalence of fibromyalgia, autistic traits and hypermobility was 40%, 65% and 44% respectively. Half of all subjects reported food sensitivity and 31% reported food intolerance. The incidence of food-related symptoms was higher among subjects who met criteria for fibromyalgia than those who reported autistic traits or hypermobility. Food sensitivity and food intolerance were both more significantly associated with fibromyalgia (r=0.24, p>0.001 and r=0.38, p>0.001) than with autistic traits (r=0.15, p>0.01 and r=0.17, p>0.01).  DISCUSSION  This is the first community study to provide evidence for a direct association between features of fibromyalgia and reported food intolerance and sensitivity. Although self-selected, the findings in our predominantly young population suggest that gluten and lactose consumption may be associated with higher levels of musculoskeletal pain. The study population commonly reported that avoidance of gluten and / or lactose containing foods reduced symptoms. Dietary adjustment may merit further investigation as a therapeutic modality for some patients with fibromyalgia.
The Algorithm; Mind of a Virtual Era – Our Code of Codes
Authors: Aragno Anna
Published: April 2023

As soon as something implicit intrudes consciousness human thought undergoes a radical change. The introduction of any new tool or code brings a shift in cognition; every micro-step layering new semiotic forms within each macroevolutionary-stage has buttressed a new semantic leap. Our mechanization of everyday life and the tech-systems we interact with are impacting communication, cultural norms and values, market-aesthetics, and economics, in societies at large.

Undergirded by a survey of the role and significance of tools in human evolution, this study arrives at what is already a well-entrenched new era: the digital, screen-mediated age. Revolutionized by the algorithm, introduced by computers, this age is dominated by the addictive quality of instant contact, unlimited information, virtual gaming, and titillating service-forms, all at our finger tips.

Aside from the interpersonal impact on the new humans growing up with devices in hand, how does this disembodied, digital code-form through which our interactions are mediated condition human cognition? How does its seductive efficiency interfere with how we relate, feel, assign meanings, think? Rooted in Code Biology macro-evolutionary and psychoanalytic principles, this paper examines the algorithm itself and takes a sweeping interdisciplinary approach to the developmental, psychosocial, and cognitive implications for the human mind/brain as it interacts with its technological extension.
The impact of leadership on working motivation create lability for employees at FPT Software Da Nang
Authors:   The University of Danang - University of Economics, Vietnam, Bui Thu Thi Minh , Phan Lai Thi Yen ,   Branch of Hanoi University of Internal Affairs in Quang Nam, Vietnam
Published: April 2023

After 16 years of operation, FPT Software Da Nang has continuously grown and become the largest information technology company in the Central region with 3000 employees, whose average growth rate of the last 3 years is more than 70%/ year. Due to the nature of the information technology industry, FPT Software Da Nang has a fast-paced, long-term working environment, with working conditions and processes having a high degree of interdependence between teams. Maintaining loyalty and motivating employees is one of the most important tasks of a leader. Therefore, invisible competition in terms of leadership is significantly important for FPT Software Da Nang. To create work motivation and loyalty by offering benefits, influencing and stimulating it is indispensable to increase the effective functioning of workers at work, in a profession or in specific functions. Therefore, the study was conducted with data collected from 285 employees at the company using the Structural Equation Modeling technique. The results confirm that leadership capacity has a direct impact on work motivation, creating loyalty for employees, thereby proposing management measures to create competitive advantages for FPT Software Da Nang and other enterprises in Vietnam.
Improving Vietnamese law on the pre-action collection of evidence of law violations in cyberspace
Authors:   Faculty of Business, FPT University Hanoi, Vietnam, Dao Khoi Trong
Published: April 2023

In this technological era, illegal acts are surging in cyberspace and causing considerable damage by exploiting the fast and convenient features in connecting and making online transactions. Obtaining evidence and information related to those acts is a prerequisite for the victims of law violations in cyberspace to use legitimate tools to secure their rights and interests. Such an activity must be conducted as soon as possible, even before the proceeding starts to prevent the important evidence and information of the violators from being permanently dispersed or deleted. However, such data is often stored by an opposite party or placed under the management of third parties such as banks, internet service providers and social media platforms. These parties tend to refuse information disclosure due to the conflict of interests, assurance of confidentiality and other business issues. In this regard, Vietnamese civil procedure law still encounters several difficulties for the victims to collect evidence at the pre-action stage. The law has neither clarified the victims’ right to request the evidence-holders to disclose nor provided the victims with any other effective measure to support such collection in this crucial period. Meanwhile, the procedure law of foreign jurisdictions, namely the UK and the Netherlands, is integrated with effective mechanisms to deal with this specific issue. In general, such mechanisms entitle the victims to request the court to order the evidence-holders to disclose crucial evidence of the violations and information about the violators before the commencement of a civil action. Using both doctrinal and comparative methods, this article examines these foreign schemes to determine several vital points for improving Vietnamese civil procedure law regarding the request for court assistance in collecting evidence at this pre-action stage.
Effect of Job Satisfaction on Organizational Commitment of Officers at the State admininistrative agencies in Binh Dinh Province
Authors:   Hanoi University of Natural Resources and Environment, Vietnam, Nguyen Nam Danh , Uong Lan Thi Ngoc ,   Hanoi University of Natural Resources and Environment, Vietnam
Published: April 2023

The study aims to determine the factors affecting job satisfaction, and assessing the effect of job satisfaction on the level of organizational commitment of officers at the State administrative agencies in Binh Dinh province. From the data provided by 337 officers, the structural equation model (SEM) was applied to assess the effect of job satisfaction on organizational commitment of officials working at the State administrative agencies in Binh Dinh province. The results show that there are eight factors affecting the job satisfaction of officials include (i) training and promotion opportunities, (ii) trade union activities, (iii) colleagues, (iv) salary and bonus, (v) working conditions, (vi) job stability, (vii) leadership, and (viii) the nature of work. With the factor of training and promotion opportunities have the heaviest impact on job satisfaction, and the factor of trade union activities have the weakest impact on job satisfaction of officers. The result shows that a positive relationship between job satisfaction and organizational commitment. Based on the results suggested some significant policy implications for State administrative agencies in Binh Dinh province to increase job satisfaction and organizational commitment of officials in the coming time.
Factors affecting customers’ post-purchase behavior towards apartments in Ho Chi Minh City
Authors:   University of Economics and Law, VNU-HCM, Vietnam, Phùng Thanh Bình , Trần Thị Thanh Na ,   University of Economics and Law, VNU-HCM, Vietnam, Dang Hai Ha ,   University of Economics and Law, VNU-HCM, Vietnam
Published: April 2023

The development of the market economy has had a great impact on the urban development . The rapid growth of population and the residents migrating to big cities have resulted in increasing housing demand. Housing needs for people in big cities in general and in Ho Chi Minh City, in particular, are becoming more and more urgent, especially, apartment buildings because of limited land fund of the locality. Analyzing factors affecting the customers’ post-purcahse bahavior is useful for real estate companies. To examine the causal relationship among perceived risk, perceived quality, customer satisfaction, and post-purcahse behavior, This research used structural equation modeling (SEM) to analyze 412 samples who bought apartments in Ho Chi Minh City. The results showed that the post-purchase behavior towards apartments is directly affected by satisfaction and indirectly by factors: perceived quality, perceived risk, location, after-sales support, price, and brand. And the study provided recommendations to enhance customer satisfaction influence post-purchase behavior towards apartments.
The impact of authentic leadership on employee’s engagement at Tan Son Nhat Operation Center in the COVID-19 period: The mediating role of job satisfaction
Authors:   Business and Administration Faculty, Banking University HCMC, Vietnam, Nguyễn Văn Thụy , Vũ Chí Đức Văn ,   University of Economic HCMC, Vietnam
Published: April 2023

Human resources is one of the important resources to promote the development of enterprises in the aviation sector in Vietnam. Therefore, airline firms are increasingly interested in job satisfaction and employee engagement. Aviation is a sector of special importance in economic development. Before the COVID-19 pandemic, the aviation sector developed strongly. However, when the COVID-19 pandemic broke out, the world economy suffered from enormous damage, with the first hardest-hit sector being air transport. Vietnam's aviation sector was also not an exception from the impact of the COVID-19 pandemic, according to a report by the Ministry of Planning and Investment, which said that in 2020 and the first 5 months of 2021, the revenue of aviation enterprises decreased by 61% compared to that of 2019. In Vietnam Airlines Annual report 2020, Vietnam Airline had more than 100 aircraft temporarily suspended from operation. Tan Son Nhat Operation Center was a unit of Vietnam Airline JSC with the role of a representative at Tan Son Nhat airport, which was also affected by many related impacts. In a difficult period, the role of leadership in general and authentic leadership in particular was very important in improving employee satisfaction and engagement. This research investigated and tested affecting authentic leadership on employee engagement at Tan Son Nhat Operation Center in the covid-19 period: the mediating role of job satisfaction. It uses both qualitative and quantitative research. The qualitative research was carried out through focus group discussions with 10 employees. The quantitative research was conducted with 155 employees at Tan Son Nhat Operation Center – Vietnam Airlines JSC through a survey questionnaire by the convenient sampling method. The research results analyzed by partial least square – structural equation modeling (PLS – SEM) indicated that: Components of authentic leadership (AL): self-awareness (SA), internalized moral perspective (IMP), balanced processing (BP), and relational transparency (RT) have a positive impact on employee’s engagement through the mediating role of job satisfaction.
Determination of Parameters and Efficiency of Additional Operating Parts of Deep Tillers
Authors:   Central Ukrainian National Technical University, Leshchenko Serhii , Salo Vasyl ,   Central Ukrainian National Technical University, Vasylkovskyi Olexiy ,   Central Ukrainian National Technical University, Petrenko Dmytro ,   Central Ukrainian National Technical University
Published: April 2023

The article presents an overview and analysis of existing additional operating parts of combined deep tillers of serial machines. It was established that the issue of assessing the effectiveness of additional operating parts of deep tillers and the search for their rational structural and technological parameters is insufficiently studied and needs practical solution. The most versatile operating part for high-quality work of deep tillers can be a paired toothed roller. Having studied its design parameters and operating modes, it is possible to get clear recommendations regarding its use. An improved design of the Tandem Spiked toothed roller type with mechanical adjustment is proposed, as such rollers have a much simpler shape of teeth and a smaller cross-section of each tooth. The dependences for the calculation of certain design parameters of the roller, namely its diameter, length and coefficient of volume deformation of the soil, are given based on the fact that the roller performs two functions – compaction of the lower layers of the soil and crushing of clods and intensive mixing of the upper horizons. To determine the rolling force on the soil surface, we use the relationship that includes the weight of the roller, the volume deformation coefficient of the soil, the grip width of the roller and its diameter. Field studies to assess the efficiency of paired toothed rollers ere carried out. For the effective operation of combined deep tillers of the soil, it is necessary to use additional operating parts, which should additionally grind large particles and partially mix and distribute plant residues. It is most expedient to use paired toothed rollers with mechanical adjustment as additional operating parts under difficult working conditions. At the stage of substantiating the design parameters of paired toothed rollers, it is enough to take into account the required angle of the soil roller's girth and the average value of the soil deformation depth. This will allow getting actual value of the working diameter of the roller and calculate the force of the roller rolling over the soil surface. During field studies of the operation of combined deep tillers with a paired toothed roller, it was established that when working with two toothed rollers at a working speed of 7.2...8.2 km/h, the qualitative indicator of soil crushing is at the level of 70...75%, which significantly exceeds the qualitative indicators of the work of foreign machines of a similar design under the same operating conditions.
The Mass and Clearance Dimensions of Body Machines for Applying Solid Organic Fertilizers
Authors:   Zhytomyr Agrotechnical Collede, Zhytomyr, Ukraine, Limont Anatoliy , Limont Zlata ,   Dnipro National University named after Oles Honchar, the city of Dnipro, Ukraine
Published: April 2023

The research is aimed at improving the efficiency of the technological process of applying solid organic fertilizers by body spreaders, as well as at their design through determining statistical links between the mass of mass of machines as the resultative character and their length, width and height clearance as their factorial characters. The research also covers the reverse statistical link according te which the length, width and height clearance of machines are determined as the resultative characters, and the mass of machines is taken as a factorial character. The objects of the study were body machines for the introduction of solid organic production by enterprises located in the former Soviet Union and modern Ukraine. The data related to the mass of machines and their clearance dimensions have been chosen from the corresponding catalogues of farm machinery and advertising information of plants producing machines for applying solid organic ferhlizers. The processing of the data collected is made on the basis of the mathematical statistics, as well as with the use of standard computer programs. The correlation coefficients in the investigated pair statistical links have taken positive values ranging from 0.474 to 0.890 under the correlation links of the resultative characters for factorial ones which fluctuated from 0.609 to 0.866. The increase in the factorial characters is accompanied by the resultative characters investigated. In order to specily and reveal the character of the relations between the investigated parameters of body machines used for applying solid organic fertilizers we have accomplished the adjustment of experimental values of the resultative characters depending on factorial equations of straight lines with positive angular coefficients and curvilinear relations – graded with logarithmic, exponential and indicial ones and with hyperbolas with the determination of R2-coefficient for every approximation functions. The research testifies that change in the mass of machines depending on their length and height clearance and length and height of machines depending on their mass will be better presented by the equations of straight lines with positive angular coefficients. According to calculations the change in the mass of machines depending on its width clearance and the width clearance depending on its mass appears most expedient when presehted by the corresponding equations of the accelerated increasing exponent and gradually increasing inter-stage function. The dependences obtained as a result of the research conducted can be used for designing body machines for spreading solid organic fertilizers, as well as for using them in the technological processes of growing farm crops.
Plant Root Mass and Prediction of Long Flax Productivity and Fiber Quality
Authors:   Zhytomyr Agrotechnical Collede, Zhytomyr, Ukraine, Limont Anatoliy , Limont Zlata ,   Dnipro National University named after Oles Honchar, the city of Dnipro, Ukraine
Published: April 2023

The purpose of the article was to study the productivity of flax and the quality of the fiber and the number of elementary fibers in the cross section of the stem depending on the mass of the roots of plants. The density of stalks before harvesting, as well as the yield of seeds and fibers were determined as the productivity of long flax. The fiber quality indicators include the number of long fiber, fiber strength, flexibility, metric number and the calculated quality factor of the yarn. The number of elementary fibers in the bast bundle and the total fiber in the cross section of the stem is estimated. Based on correlation-regression analysis using experimental data, L.D. Fomenko determined that the change in stem density, seed and fiber yield, long fiber number, its strength and flexibility, metric number and calculated quality of yarn, plant weight at the beginning of flowering and before harvest, the number of elementary fibers in the bast bundle and all fibers in the cross section stem, as well as the height of the plants depending on the mass of the roots is described by the equations of rectilinear regression with positive angular coefficients. The change in the diameter of the stems depending on the mass of the roots of the plants is written off by the equation of the line with a negative angular coefficient.
Results of Experimental Studies Pneumatic Harvesting of Pests Agricultural Crops
Authors:   Central Ukrainian National Technical University, Onopa Volodymyr , Artemenko Dmytro ,   Central Ukrainian National Technical University
Published: April 2023

The article presents the results of experimental research on the pneumatic collection of pests of agricultural crops. Today, insect pests are one of the main problems in agriculture. Pests cause 20 to 40 percent of global crop losses every year, and pesticide treatment is the main method of control. The continuous use of pesticides leads to potential human diseases, plant and soil pollution, so much attention is paid to ecological control methods. Pneumatic collection of pests is the main and most effective means of control. And the development of new designs and devices for its implementation is an urgent task. The analysis of the constructions and researches of pneumatic machines for harvesting pests of agricultural crops allowed us to come to the conclusion that recently, machines with a pneumatic harvesting system are most often used for harvesting pests, as those that damage the plant the least. Due to their efficiency, pneumatic machines of the suction type are becoming the most popular. The use of machines of this type will make it possible to obtain ecologically clean food products without the use of chemical means of control. In the work, the design of the pneumodisinfector and the device for the pneumatic collection of pests of agricultural crops is proposed and the efficiency of its operation is investigated. Experimental studies of the proposed pneumodisinfectant sector showed that, on average, for three harvests, the effectiveness was: on winter wheat - 74.0%, on alfalfa - 60%, on potatoes - 68.3%, on eggplant - 78.5%, on tomatoes - 79, 3%, sweet pepper – 91.0%. The number of plants affected by viruses decreased by 1.2 times compared to the control without pneumodisinfection. The costs of applying chemical protection exceeded the costs of pneumodisinfection by 4.7 times. On the basis of the obtained data, in the conditions of production crops of winter wheat, alfalfa, eggplant and potatoes, the use of a pneumodisinfector is an effective method.
A methodical Approach to Substantiating the Performance Indicators of the Machine-Tractor Unit Using Energy-saving Technologies
Authors:   Institute of Mechanics and Automatics of Agroindustrial Production of the National academy of Agrarian Sciences of Ukraine, Glevakha, Ukraine, Kudrynetskyi Rostyslav , Dnes Viktor ,   Institute of Mechanics and Automatics of Agroindustrial Production of the National academy of Agrarian Sciences of Ukraine, Glevakha, Ukraine, Krupych Stepan ,   Institute of Mechanics and Automatics of Agroindustrial Production of the National academy of Agrarian Sciences of Ukraine, Glevakha, Ukraine
Published: April 2023

The article considers a mathematical model for determining the operational indicators of a machine-tractor unit, for determining a rational fleet of farm machines that ensures the performance of work with minimal operating costs and in optimal agrotechnical terms. The structure of operating costs during the cultivation of agricultural crops using different technologies was obtained. Patterns of changes in operational costs for growing crops using No-till and Strip-till technologies. The application of these regularities makes it possible to obtain predictive values of the efficiency of the use of the farm's machine-tractor park even at the planning stage. The choice of technical means must be carried out taking into account the requirements of agricultural techniques for growing agricultural crops, zonal soil and climatic conditions and the condition of the fields. To ensure the performance of works with minimal operating costs, it is necessary to equip the machine and tractor park with technical means that ensure high-quality performance of works in optimal agrotechnical terms. It was established that in the structure of the total operational costs for growing agricultural crops using intensive technology, about 55...66% are the costs of technological materials used during the cultivation of agricultural crops.The developed mathematical model for determining the performance indicators of the MTA makes it possible to obtain predictive values of the efficiency of the use of the farm's machine-tractor fleet even at the planning stage.
Theoretical Study of the Separation of Seed Material According to the Density of Grains by a Conical Vibro-pneumocentrifuge
Authors:   Podillia State University, Kamianets-Podilskyi, Ukraine, Kotov Borys , Stepanenko Serhiy ,   Institute of Mechanics and Automatics of Agroindustrial Production, Glevakha, Ukraine, Kalinichenko Roman ,   Separated Subdivision NULESU (Nizhyn Agrotechnical Institute), Nizhyn, Ukraine
Published: April 2023

The article examines the study of the separation of seed material by grain density by a conical vibro-pneumocentrifuge, taking into account the distribution of air velocity in the cross section of the aspiration channel, to determine the rational form and parameters of the working bodies of the conical vibro-pneumocentrifuge, as well as technological indicators of the machine: supply, consumption, efficiency of seed separation into factions. Scientific research has formulated improved mathematical models of grain movement in the vibro-pneumofluidized layer of a conical vibrocentrifuge centrifuge, which take into account the change in the action of the centrifugal force depending on the grain coordinate along the height of the cone, allowing to determine the movement parameters with varying degrees of accuracy. It is substantiated that when using a conical support surface of a vibrocentrifugal centrifuge, the thickness of the mixing layer of grain increases in the direction of movement, and it is possible to determine by theoretical calculations the rational geometric and kinematic parameters of the rotor, which ensure a qualitative separation of the seed material by density. The obtained systems of nonlinear differential equations with initial conditions are solved in the MathCad software environment in the form of grain movement trajectories in the air flow, which allows to calculate and establish the trends of their movement trajectories, which differ by windage coefficients, and to determine the rational values of the parameters of the conical vibropneumocentrifuge.
Preliminary Studies of Passive String Sieve
Authors:   Central Ukrainian National Technical University, Vasylkovskyi Oleksii , Leshchenko Serhii ,   Central Ukrainian National Technical University, Petrenko Dmytro ,   Central Ukrainian National Technical University, Moroz Serhii ,   Central Ukrainian National Technical University, Nesterenko Oleksandr ,   Central Ukrainian National Technical University
Published: April 2023

The article presents the results of research into the operation of the model of the original string sieve. The sieve is equipped with synthetic strings made of ultra-small diameter Dyneema braided cord. The purpose of this study is to evaluate the performance and identify the main indicators of the technological efficiency of the proposed fixed sieve installed at an angle to the horizon. Preliminary studies of the sowing sieve model were carried out by implementing the plan of a full factorial experiment. The experiments were carried out on a model of a seed sieve with holes of 2 mm. In the course of experiments, a post-harvest heap of winter wheat with natural clogging was used. The criterion for evaluating the efficiency of separation is the mass of seeding, and the specific feed and the angle of inclination of the sieve are the operating factors. The operational efficiency was established and the main performance indicators of the model were identified. The statistical mathematical model of the process allows us to assert the linear dependence of the criterion on the operating factors and to obtain a quantitative assessment of their influence on the process of cleaning the grain mixture. The surface of the response of the mass of the selected seeding from the specific loading of a unit of the sieve area and the angle of its inclination is constructed. An analysis of the regression equation and the response surface was carried out, during which design flaws were identified and tasks for further research were formulated. The factor that was found to be influential in the course of the previous experiments – the angle of inclination at the minimum value does not fully ensure guaranteed performance, since during the experiments clogging and accumulation of piles on the separating surface were periodically observed. An increase in the mass of the selected seeding is achieved by reducing the angle of the passive sieve to 17º and increasing the specific supply to 160 kg/dm2 ּh. A decrease in feed worsens the sieving process, especially at a small angle of inclination of the sieve, however, according to the Student's test, it is not significant. The resulting non-classical dependence may indicate the imperfection of the layout, the influence of unforeseen factors, etc., and requires further research.