bluuebunny/crossref_metadata_2025 huggingface dataset:
The Relationship Of Motivation With Nurses' Performance
Authors: Maemunah Neni , Susmini Susmini , Bili Rustiana Nona
Published: May 2024

Introduction: The high commitment of nurses in providing optimal health services to patients is an illustration of the seriousness of nurses to maintain the quality of services provided by hospitals. The aim of the research is todetermine the relationship between motivation and performance commitment of nurses.Methods: The research design used cross sectional. The research population was 65 nurses with a sample size of 56 nurses. Samples were taken using simple random sampling technique. The independent variable is motivation, the dependent variable is nurse performance commitment. The instrument used was a questionnaire. Data analysis used Fisher's exact test.Results: The results of this research show that the majority of respondents have motivation in the good category, some respondents have performance in the good category and there is a relationship between motivation and the performance commitment of nurses with a value of p value = ( 0.018) (0.05). Conclusion: There is a relationship between motivation and performance commitment of nurses. Factors that affect motivation and performance, namely workload and length of work can be used as topics for future researchKeywords: Motivation, Performance Commitment, Hospitals, Nurses.
Hydrogel Substrates of Collagen-Starch-Selenium Complexes for Stimulating Plant Metabolism
Authors: Gomez-Galicia Dirce S. , Claudio-Rizo Jesús A. , Cabrera-Munguía Denis A. , Mendoza-Villafaña Juan J. , Flores-Guía Tirso E. , Cano-Salazar Lucía F.
Published: May 2024

Various selenium (IV) complexes with essential amino acids such as phenylalanine, histidine, and tryptophan were encapsulated within polymeric matrices in hydrogel state based on collagen-starch, generating the biomatrices Col-St(Se-F), Col-St(Se-H), and Col-St(Se-T), respectively. 1 mg of each type of selenium complex was employed per mass ratio in matrices consisting of 60% collagen and 18% starch by mass. The advanced materials were surface-characterized using scanning electron microscopy (SEM), and their properties such as swelling capacity and degradation rate in commercial vegetable substrate were also evaluated. The amino acid involved in the selenium complex forms characteristic granules that determine the microstructure and porosity of the biomatrix; reporting that in the case of all biomatrices with selenium complexes, swelling capacities exceeding 2900% are shown, resulting statistically significant compared to the sole collagen-starch matrix. Likewise, the matrices exhibit resistance to degradation in the presence of the commercial vegetable substrate for up to 30 days of evaluation. In vitro biocompatibility studies with green and red tomato cells derived from fresh seeds reveal that the biomatrices Col-Str(Se-F) and Col-Str(Se-H) overstimulate the metabolism of green tomato cells, while for red tomato cells, greater stimulation is appreciated in the Col-Str(Se-T) biomatrix. The chemical composition of the biomatrices promotes the proliferation of these types of plant cells as inspected by epifluorescent microscopy. Such advanced materials could be successfully applied in agricultural applications related to tomato cultivation by regulating water capacity, substrate biodegradation, and stimulated metabolism to promote tomato growth.
Effect of the Zn-aminoacid MOF concentration on the in vitro biocompatibility of red and green tomato seed cells over collagen-starch-ZnMOFs hydrogels
Authors: Denis A. Cabrera-Munguia , Andrea M. Palao-Portillo , M. Ileana León-Campos , Cristian Aguirre-Joya , David R Aguillón-Gutiérrez , Jesús A. Claudio-Rizo
Published: May 2024

A balance between macronutrients (N, P, K, Ca, Mg) and micronutrients (Fe, Zn, Mn, Mo, B, Cl) is essential for the thriving of red tomato (Solanum lycopersicum) and green tomato (Physalis philadelphica) plants as well as good water irrigation. Zn is a vital micronutrient in seed development, fruit set, and maturity, while histidine plays a critical role in plant growth and development. Hence, a MOF based on Zn and histidine (ZnHis) was added in different amounts (X=0, 10, 30, and 50 wt. %) into a composite hydrogel of collagen and starch to supply of water and micronutrients necessary for the in vitro proliferation, and cell migration of red tomato and green tomato cells living over these hydrogels. The functional groups and reticulation degree were assessed by ATR-FTIR and the ninhydrin assay. The metabolic activity of red tomato and green tomato cells living on these hydrogels was tested by reaction with MTT. Cell migration of red tomato and green tomato cells was studied by light microscopy. The results evidencing that 10 wt. % and 30 wt.% of ZnHis are the preferable concentrations to promote cell metabolism, and cell migration of red tomato and green tomato cells extracted from seeds
Detecting Population III Stars through Tidal Disruption Events in the Era of JWST and Roman
Authors: Kar Chowdhury Rudrani , Chang Janet N. Y. , Dai Lixin , Natarajan Priyamvada
Published: May 2024

The first-generation metal-free stars, referred to as Population III (Pop III) stars, are believed to be the first objects to form out of the pristine gas in the very early Universe. Pop III stars have different structures from the current generation of stars and are important for generating heavy elements and shaping subsequent star formation. However, it is very challenging to directly detect Pop III stars given their high redshifts and short lifetimes. In this Letter, we propose a novel method for detecting Pop III stars through their tidal disruption events (TDEs) by massive black holes. We model the emission properties and calculate the expected rates for these unique TDEs in the early Universe at z ∼ 10. We find that Pop III star TDEs have much higher mass fallback rates and longer evolution timescales compared to solar-type star TDEs in the local Universe, which enhances the feasibility of their detection, although a good survey strategy will be needed for categorizing these sources as transients. We further demonstrate that a large fraction of the flare emissions are redshifted to infrared wavelengths, which can be detected by the JWST and the Nancy Grace Roman Space Telescope (Roman). Last but not least, we find a promising Pop III star TDE detection rate of up to a few tens per year using Roman, based on our current understanding of the black hole mass function in the early Universe.
Comparative Study of Primary SMILE, SMILE Enhancement, and Femtosecond Laser–Assisted LASIK on Higher Order Aberrations and Corneal Densitometry
Authors: Foo Valencia Hui Xian , Liu Yu-Chi , Ang Marcus , Htoon Hla Myint , Ting Darren Shu Jeng , Mehta Jodhbir S.
Published: May 2024

Purpose:

To compare differences in corneal densitometry (CD) and higher order aberrations (HOAs) in eyes that underwent small incision lenticule extraction (SMILE) and femtosecond laser–assisted laser in situ keratomileusis (FS-LASIK) for the treatment of myopia and myopic astigmatism at postoperative months 3, 6, and 12, and to evaluate their changes in a separate cohort of eyes after SMILE enhancement.

Methods:

In this prospective, randomized, paired-eye clinical trial, consecutive eligible participants were randomized to undergo SMILE or FS-LASIK in either eye. Main outcome measures were CD and HOAs preoperatively and at 3, 6, and 12 months postoperatively. A separate cohort of consecutive patients who had SMILE and underwent enhancement were also included for comparison.

Results:

For CD, no significant differences were found between SMILE and FS-LASIK up to month 12. For HOA measured by wavefront aberrometry, both SMILE and FS-LASIK had an increase in total root mean square (RMS) HOAs, spherical aberration (SA), and vertical coma up to month 12. SMILE had an additional increase in vertical quatrefoil, and FS-LASIK had an increase in horizontal coma at month 12. FS-LASIK had higher SA than SMILE, whereas SMILE had higher vertical quatrefoil than FS-LASIK at month 12. Central and posterior zone CD had significantly decreased after SMILE enhancement compared to after primary SMILE up to 2 years after enhancement. RMS HOAs, lower order aberrations, and SA were all increased after SMILE enhancement compared to after primary SMILE.

Conclusions:

SMILE induced lower SA but higher vertical quatrefoil than FS-LASIK at 1 year. Both SMILE and FS-LASIK had similar increases in RMS HOAs and vertical coma up to 1 year. There were no differences in CD between both groups. SMILE enhancement additionally had decreased central and posterior CD but greater RMS HOAs and SA compared to primary SMILE.

[
J Refract Surg
. 2024;40(5):e291–e303.]
Salzmann's Nodular Degeneration in Refractive Surgery: The Earlier Hit Hypothesis of EBM Injury-Related Fibrosis of the Subepithelial Space and Deeper Corneal Extension
Authors: Wilson Steven E. , Dupps William J.
Published: May 2024

Purpose:

To review the atypical development of Salzmann's nodular degeneration (SND) after two cases of laser in situ keratomileusis (LASIK) and one case of photorefractive keratomileusis (PRK), and to highlight the pathophysiology of SND and its treatment.

Methods:

Three cases of SND (two following LASIK performed with microkeratomes and one following PRK) were reviewed and Pubmed.gov and internet searches were performed.

Results:

SND is myofibroblast-generated fibrosis in the subepithelial space between the epithelium and Bowman's layer that develops years or decades after traumatic, surgical, infectious, or inflammatory injuries to the cornea in which the epithelial basement membrane is damaged in one or more locations and does not fully regenerate. It is hypothesized based on these cases, and the previous immunohistochemistry of other investigators, that myofibroblast precursors, such as fibrocytes or corneal fibroblasts, that enter the subepithelial space are driven to develop into myofibroblasts, which slowly proliferate and extend the fibrosis, by transforming growth factor-beta from epithelium and tears that passes through the defective epithelial basement membrane. These myofibroblasts and the disordered collagens, and other extracellular matrix components they produce, make up the subepithelial opacity characteristic of SND. Nodules are larger accumulations of myofibroblasts and disordered extracellular matrix. If the injury is associated with damage to the underlying Bowman's layer and stroma, as in LASIK flap generation, then the myofibroblasts and fibrosis can extend into Bowman's layer and the underlying anterior stroma.

Conclusions:

SND fibrosis often extends into Bowman's layer and the anterior stroma if there are associated Bowman's defects, such as incisions or lacerations. In the latter cases, SND frequently cannot be removed by simple scrape and peel, as typically performed for most common SND cases, but can be trimmed to remove the offending tissue. This condition is more accurately termed Salzmann's subepithelial fibrosis.

[
J Refract Surg
. 2024;40(5):e279–e290.]
Image encryption with leveraging blockchain-based optimal deep learning for Secure Disease Detection and Classification in a smart healthcare environment
Authors: Alrayes Fatma S. , Almuqren Latifah , Mohamed Abdullah , Rizwanullah Mohammed
Published: May 2024

Blockchain (BC) in healthcare can be used for sharing medical records and secure storage and other confidential data. Deep learning (DL) assists in disease recognition through image analysis, specifically in detecting medical conditions from images. Image encryption ensures the security and privacy of medical images by encrypting the image before sharing or storage. The combination of image encryption, BC, and DL provides an efficient and secure system for medical image analysis and disease detection in healthcare. Therefore, we designed a new BC with an Image Encryption-based Optimal DL for Secure Disease Detection and Classification (BIEODL-SDDC) technique. The presented BIEODL-SDDC technique enables the secure sharing of medical images via encryption and BC technology with a DL-based disease classification process. Furthermore, the medical image encryption process took place using the ElGamal Encryption technique with a giraffe kicking optimization (GKO) algorithm-based key generation process. In addition, BC-based smart contracts (SCs) were used for the secure sharing of medical images. For the disease detection process, the BIEODL-SDDC technique encompassed EfficientNet-B7-CBAM-based feature extraction, Adam optimizer, and a fully connected neural network (FCNN). The experimental validation of the BIEODL-SDDC technique was tested on medical image datasets and the outcome highlighted an enhanced accuracy outcome of 94.81% over other techniques.
Ulam-Hyers stability and existence results for a coupled sequential Hilfer-Hadamard-type integrodifferential system
Authors: Muthaiah Subramanian , Murugesan Manigandan , Awadalla Muath , Unyong Bundit , Egami Ria H.
Published: May 2024

This study aimed to investigate the existence, uniqueness, and Ulam-Hyers stability of solutions in a nonlinear coupled system of Hilfer-Hadamard sequential fractional integrodifferential equations, which were further enhanced by nonlocal coupled Hadamard fractional integrodifferential multipoint boundary conditions. The desired conclusions were obtained by using well-known fixed-point theorems. It was emphasized that the fixed-point technique was useful in determining the existence and uniqueness of solutions to boundary value problems. In addition, we examined the solution's Ulam-Hyers stability for the suggested system. The resulting results were further demonstrated and validated using demonstration instances.
Povjerljivost u superviziji iz perspektive supervizora
Authors: Hamer Vidmar Nikica
Published: May 2024

ABSTRACT The aim of this paper was to define which ethical dilemmas related to confidentiality, as an important ethical principle, occur ammong supervisors, how they act in these situations and what guides them. In the research that was conducted by an anonymous web questionnaire participatd licensed supervisors as well as supervisors that still participate in education. In this article there are presented results of the findings related to three research questions: which ethical dilemmas regarding adherence to confidentiality agreements occur in supervision; what guides supervisors in resolving ethical dilemmas related to confidentiality and how in practice.they resolve their ethical dilemmas related to confidentiality. Data analysis shows that ethical dilemmas related to compliance with confidentiality agreements relate to the categories: composition of supervision groups, expectations of supervisors, responsibilities of supervisors towards the employer/ organisatio that oredered supervision, dual roles of supervisors, supervisors attitude toward confidentiality and responsibilities of supervisors towards confidentiality. When solving ethical dilemmas, supervisors are guided by principles: related to the confidentiality agreement, concern for the welfare of the supervisee and client, professional values, methods and way of working. Related to the issue of practical resolving of ethical dilemmas related to confidentiality, the following categories were distinguished: practical use of confidentiality agreements and transparency. From the findings, it can be concluded that it is extremely important to develop the supervisor’s competencies in order to be able to bring an ethical distinction, but also to teach the supervisee how to behave ethically in their practical work. The above mentioned can be provided by systematic support in the form of meta-supervisions, intervision, consultations, written instructions and codes. Key words: supervision; ethical dilemmas; confidentiality; competences; confidentiality agreements.
Ocular disorders in a tertiary Hospital in South East Nigeria
Authors: Eze Christian Chukwuemeka , Ekweremadu Ezekiel , Okoloagu Nkiruka N.
Published: May 2024

The object of this study was to determine the pattern of ocular disease patients that presented to the Enugu State University of Science and Technology Teaching Hospital, Park Lane, Enugu, Nigeria. A retrospective study was conducted, where the medical case notes of patients who had ocular examinations, other clinical examinations, and investigations from April 2022 through December 2022 were retrieved. There were a total of 1145 patients, with a male population of 476 (41.6%), while females were 669 (58.4%). The mean age of the study population was 40.8 years, with a Standard Deviation (SD) of 22.4. A total of 924 (80.7%) participants were adults while children (aged 16 years and below) were 221 in number and constituted 19.3% of the study population. The most common eye disease was refractive error, which occurred in 266 (23.2%) of the participants; it was followed by allergic eye diseases, 201 (17.6%), cataract, 170 (14.9%), glaucoma, 111 (9.7%), and trauma to the eye, 94 (8.2%). Among the children, the most common eye disease seen were allergic eye diseases, 78 (35.3%), followed by refractive error, 70 (31.7%), trauma, 21 (9.5%), cataract, 11 (5.0%), while infections of the eye were 10 (4.5%). The most common eye disease among the adult participants was refractive error, 196 (21.1%), and then cataract, 159 (17.2%), allergic eye diseases, 123 (13.3%), glaucoma, 105 (11.4%), and retinal pathologies, 82 (8.9%). The most common causes of eye diseases in this study were refractive error, allergic eye diseases, cataracts, glaucoma, and trauma. Health education at community and primary health care level could help to reduce the number of people with avoidable causes of visual impairment.
Asymptotic behaviour of the survival probability of almost critical branching processes in a random environment
Authors: Kharlamov Victor Vladimirovich
Published: May 2024

A generalization of the well-known result concerning the survival probability of a critical branching process in random environment $Z_k$ is considered. The triangular array scheme of branching processes in random environment $Z_{k,n}$ that are close to $Z_k$ for large $n$ is studied. The equivalence of the survival probabilities for the processes $Z_{n,n}$ and $Z_n$ is obtained under rather natural assumptions on the closeness of $Z_{k,n}$ and $Z_k$.
Bibliography: 7 titles.
Effects perceived by Vietnamese B1 EFL students of extensive reading on intercultural competence
Authors: Nguyen Van Thi Ngoc , Nguyen Nam Thi Phuong
Published: May 2024

Investigation of effective approaches for supporting students’ linguistic and intercultural competence in the process of learning English as an international lingua franca has generally been an issue of great concern for teachers and researchers in language education. The study considered how fiction reading and non-fiction reading supported students’ reading comprehension and fostered their self-perception of intercultural competence. The scaffolds were tested in a pretest-posttest design on 58 participants, and in a classroom-based setting. Two measurement instruments included a reading comprehension test and a questionnaire on students’ self-perception of their intercultural competence. Both groups made significant progress in reading comprehension. Fiction reading condition was also found to contribute to the higher self-perception of intercultural competence. Discussion of the pros and cons of the experimental design and suggestions for further research into extensive reading and speech act appropriateness are in the last part of the paper. The paper finally puts forward the suggestion that short literary texts of cultures around the world might be considered as one of the meaningful inputs in B1 EFL classrooms.
Exploring the impact of risks on road construction quality: an AHP model study
Authors: Dang Thanh Trung , Nguyen Phong Duyen , Tran Minh Tuan ,   Hanoi University of Mining and Geology, Hanoi, Vietnam
Published: May 2024

The construction industry plays a role in the development of countries. The progress of this industry mainly depends on the quality of construction works, which is closely related to the longevity of the work. A risk assessment of construction quality is a comprehensive assessment of the level of risks and the construction contractor faces during the construction process. Risk factors affect the quality of work in the aspect of labor, equipment and machinery, material, constructional technology, environment, etc. Based on these factors, the authors build an index system to evaluate the quality of works according to experts. Quality is one of the factors to evaluate the success of construction projects. The level of success of the construction industry depends on many quality performances. The method used in this article is the analytical hierarchical method (AHP) for quantitative analysis, which has the function of comparing and selecting alternatives without requiring big data, etc. This method will also be chosen to satisfy the set of criteria. Based on the principle of comparing pairs of criteria, the AHP method analyzes, evaluates, synthesizes, and answers the question "Which criterion affects the quality of the work during the construction process?". This study is conducted to scrutinize the factors that harm construction projects. The results of the study evaluating over 15 criteria show that the influencing factor due to equipment and machinery assessed has the greatest influence on the quality of the work.
Effect of the low-order coefficients of the Earth gravity model in calculating the satellite orbit
Authors: Luong Dung Ngoc , Tran Trong Dinh ,   Hanoi National University of Civil Engineering, Hanoi, Vietnam
Published: May 2024

The Earth's gravity model is a crucial factor in determining satellite orbits. Scientific organizations such as GFZ Potsdam in Germany, GRGS Toulouse in France, and AIUB in Switzerland have established Earth gravity models with increasing precision of spherical harmonic coefficients. Low-order coefficients, including C ̅_21,( S) ̅_21, C ̅_10,C ̅_11,( S) ̅_11and C ̅_20, play a vital role in describing changes in the Earth's poles, geometric center, and flattening. To evaluate the impact of these coefficients and understand altimeter satellite orbital error, the Propagerror program was developed. This program calculates satellite orbital error from the differential components of Earth gravity model spherical harmonic coefficients (dC/Slm), which can be obtained from the difference between two gravity models or from seasonal and annual components of spherical harmonics. By separating appropriate low-order components in the Earth gravity models, the Propagerror program enables the estimation of satellite orbital error. In this study, we isolate C ̅_10,C ̅_11,( S) ̅_11, and C ̅_21,( S) ̅_21 coefficients in the EIGEN-GRGS.RL02bis.MF and EIGEN-6S gravity models to assess the geophysical impact on satellite orbits. The influence of the geometry center elements results in a 2 cm error in the Jason-2 satellite, while the rotational axis elements have no effect. The C ̅_31,( S) ̅_31 coefficient has a 6-7 mm impact on the accuracy of the Jason-2 satellite, as demonstrated by the satellite error map in two situations with and without the C ̅_31,( S) ̅_31 harmonic coefficient. This study highlights the significance of regulating function coefficients in satellite orbit determination, particularly the low-level harmonic parameters. The Propagerror program provides insights into the impact of each spherical harmonic parameter on satellite orbits, contributing to the improvement of orbit accuracy and the understanding of the Earth's gravity model.
Evidence of active tectonic activity in Muong Te area illuminated by geomorphic analysis
Authors: . Dao Anh Vu , . Hai Thanh Tran , . Thanh Xuan Ngo , . Hung Quoc Nguyen , Bui Hien Thu Thi , Dinh Van Quoc , . Binh Van Phan , . Hiep Huu Nguyen ,   Hanoi University of Mining and Geology, Hanoi, Vietnam
  Tectonics and Geodynamics for Geo-resources, Environment and Sustainable Development (TGREEN), Hanoi, Vietnam
  Vietnam Academy of Science and Technology, Hanoi, Vietnam
Published: May 2024

Muong Te area is located in the northwest part of the Da River valley is seismically active with numerous recent earthquakes and associated geohazard as the consequences of tectonic collisions between the Indian plate and the Eurasian plate. The most dominant lineament system alogate in NW - SE trending which is about several kilometer to several ten kilometer. However, there has been little research regarding neotectonics deformation in this area. This study compiles remote sensing images observation data with new extracted geomorphic indices of the fluvial network to illustrate deformation patterns and potential active movements in the Muong Te. Previous study noticed that although river channels occupy a small part of the land surface, a longitudinal river profile is a more sensitive indicator of rock uplift rate than other morphological properties (Whipple et al. 2007; Dinh et al. 2019). Relationship between faults and geomorphology is quantified using 12.5 - m ALOS DEM to extract channel and basin metrics including drainage basin normalized steepness index (ksn) is greater than 200 (m0.9), and knickpoints of modeled river longitudinal profiles. The results of the normalized steepness index also show that several knickpoints arise locally from lithological boundaries of different erodibility; however, many high values of ksn the river were truncated by the NW - SE lineamets system which is suggesting that Da River fault system seem to be active. The results proposed that the strike - slip and normal motions alternated because of a permutation of σ1/σ2 under the same extensional stress regime of σ3 in the northeast - southwest direction. The existence of the active tectonics in the area might pose many geological hazards and it threat to regional habitants.
Characteristics of Stratigraphy and sedimentation of the Phu Khanh Basin and adjacent area
Authors: Hoang Long Van , Bui Hoang Huy , Nguyen Tuan Quang , Ngo Anh Van Thi , Mai Dam Hoang , Nguyen Lan Tuyet Thi , Phung Phuong Lan Thi , Ho Thanh Thi , Tran Huong Thi , Ngo Chi Kim Thi ,   Vietnam Petroleum Intitute, Hanoi, Vietnam
  VPI - Lab, Vietnam Petroleum, Hanoi, Vietnam
  Hanoi University of Mining and Geology, Hanoi, Vietnam
Published: May 2024

The Phu Khanh Sedimentary Basin is situated in the deep-water offshore area, east of the continental shelf of Central Vietnam. This area is said to have quite good oil and gas potential, but very few geological and petroleum research projects have been carried out in the past. In this article, the authors update new research results based on new seismic interpretation and well data conducted in recent years. The obtained results show that: Stratigraphy of the Phu Khanh Basin was subdivided into 5 large sequences, including: a. Eocene(?)/Oligocene unit is mainly clastic sediments of fluvial/lacustrine, delta plain and marine environments, b. Lower Miocene stratigraphy: Includes deltaic clastic sediments and shelfal carbonates; c. Middle Miocene stratigraphy: includes delta-plain, shallow marine terrigenous sediments and shelfal carbonate, d. Upper Miocene and Pliocene - Quaternary units include continental shelf and deep-sea terrigenous sediments. Each unit of stratigraphy and corresponding sedimentary environment is related to each stage of the geological and tectonic evolution of the basin. In general, the trend changes from the fluvial/lacustrine environment to the deltaic, shelfal and deep marine environments upward. Establishing the names of the formations and the presence of the Eocene sedimentary rocks in the Phu Khanh Basin is still an open issue. More detailed data, especially well data, are needed to obtain a more convincing interpretation.
Initial research results on the possibility of using metacarbonate formations in Tan Lap - Cho Don - Bac Kan province as decorative stone
Authors: Le Tu Ngoc Thi , To Ban Xuan , Pham Anh Van Thi , Dang Vinh Thi , Pham Sinh Truong ,   Hanoi University of Mining and Geology, Hanoi, Vietnam
Published: May 2024

Based on the study of the characteristics of materials, structure, textures and physical properties of metacarbonate rocks at Tan Lap area, Cho Don district, Bac Kan province, it is possible to provide the initial possibility of using these rocks as decoration stones. Methods applied in the study include field investigations and sampling; sample analysis for thin-section microscopes, for the chemistry of sicilate and physical properties. The results indicate that metacarbonate rocks consist mainly of marbles which are allocated within the 3rd unit of the upper part of Mia Le formation (D1ml2). The rocks are thick layered structure, granoblastic texture, fine- to medium-grained marbles. Cao is the predominate chemical composition while heavy metals and radioactive elements are of very low contents. The rocks are pure white, exhibiting high color fastness and gloss. The outcomes of this study could serve as a scientific basis for guiding in exploration, exploitation, and utilization of mineral resources (marble) in the Tan Lap area particularly as well as in Vietnam's territory.
Application of the Kriging model combined with the whale algorithm in the optimization analysis of the micro-texture effect on the performance of the engine piston ring/cylinder friction pair
Authors: Nguyen Tuan Thanh , Le Loi Van , Tran Hiep Van ,   Hanoi University of Mining and Geology, Hanoi, Vietnam
  Vinacomin Institute of Mining and Energy Mechanical Engineering, Hanoi, Vietnam
  National University of Science and Technology "MISIS", Leninsky Avenue, Moscow, Russia
Published: May 2024

In order to study the influence of microstructure and improve the efficiency of the engine friction pair, the engine piston ring/cylinder liner friction pair is selected as the research object. This paper analyzes and evaluates the influence of microstructural geometric parameters on the performance of friction pair. The Kriging model is used as a parametric model to simulate the microstructural parameters and combined with the whale optimization algorithm to optimize the microstructural parameters. The optimal microstructural parameters of the piston ring/cylinder liner friction pair are obtained as follows: ellipse long half:15.3 μm, short half axis: 14.9 μm, offset: 6.5 μm, depth: 7.7 μm; axial spacing: 45.5 μm, and circumferential spacing: 261.2 μm. Compared with the prototype piston ring/liner friction pair, the average friction coefficients of piston ring/cylinder liner friction pair with unoptimized microstructure and optimized microstructure were, respectively, reduced by 10.88% and 13.99%, the average bearing pressure was increased by 23.75% and 24.12%, the average friction power decreased by 9.24% and 12.89%, the average oil film thickness increased by 0.56% and 7.49%, and the minimum oil film thickness increased by 29.80% and 34.51%.
Mineralogical and geological characteristics and potential of iron resources in Tan An area, Yen Bai province
Authors: Luong Khang Quang , Khuong Hung The , Le Quang Van ,   Hanoi University of Mining and Geology, Hanoi, Vietnam
  Radioactive and Rare Minerals Division, Hanoi, Vietnam
Published: May 2024

The Tan An area in Yen Bai province, located in northwestern Vietnam, is known for its high potential for iron deposits. The region has several iron occurrences, including Tan An, Nghia Hung, Buu Village, and Tran Phu Farm. The authors conducted a comprehensive study of the region using various geological and mineralogical analysis techniques to better understand the iron mineralization process. Their findings indicate that iron mineralization in the area is the result of metamorphic and hydrothermal processes characteristic of magnetite-quartzite and hematite types. The iron content in the orebodies varies from medium to high values, with an average range of 27.5÷63.7%. These results provide valuable insight into the prospect of iron resources in the Tan An region, serving as a foundation for identifying the most promising areas for further exploration. To estimate the iron resources in the study area, the Huvo method was used, yielding a total estimated amount of 11.4 million tons of Fe-metal, including 2,028,026 tons in the Tran Phu Farm area, 360,611 tons in the Buu Village area, 426,534 tons in the Nghia Hung area and 8,605,065 tons in the Tan An area at iron resource level 334a. These findings provide a preliminary assessment of the potential iron resources in the area. The study's results are significant, providing valuable information for future iron exploration and development activities in the Tan An region. With this knowledge, mining companies and investors can make informed decisions about the feasibility of mining iron in the area. Additionally, the study's results may lead to the creation of new jobs in the mining industry, benefiting the local economy and the region as a whole.
In situ U-Pb isotopic dating method on titanite, and application to determine REE-Fe-Cu mineralization age of the Sin Quyen deposit, Lao Cai province
Authors: . Dac Xuan Ngo , Trinh Son Hai , Quach Tin Duc , Khuong Hung The , Le Thu Thi , Hoang Thoa Thi , Phan Giang Hoang ,   The Vietnam Institute of Geosciences and Mineral Resources, Hanoi, Vietnam  Hanoi University of Mining and Geology, Hanoi, Vietnam  The Radioactive and Rare Minerals Division, Hanoi, Vietnam
Published: May 2024

Titanite (CaTiSiO5) is an important common accessory mineral in hydrothermal deposits, with appreciable amounts of U and Th incorporated into their structures for age dating. Titanite crystals are usually larger than zircon and monazite and may have zoning in texture and geochemistry which represent different parageneses likely related to multiple hydrothermal or mineralization events. In line with the development of laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) that has high sensitivity and spatial resolution, in-situ U-Pb isotopic dating method on titanite has become a powerful tool to investigate the ages of different zones from a mineral. Titanite typically accommodates a significant amount of Rare Earth Elements (REEs) and High Field Strength Elements (HFSEs) and the titanite generated from different origins exhibits distinct trace element geochemistry. Therefore, the trace element geochemistry of titanite can serve as an indicator of its formation environment. Titanite occurred in different mineralization stages of the Sin Quyen deposit, making it a suitable mineral for investigating the timing of mineralization. In this paper, we present the U-Pb age of titanite from different stages of the Sin Quyen deposit used to constrain the timing and origin of such events. The hydrothermal titanites are dated by in situ LA-ICP-MS technique and have U-Pb ages of 873±12 Ma and 844±12 Ma which indicate two mineralization/hydrothermal events at the same time, respectively. These ages from the Sin Quyen deposit are well correlated with regional tectono-thermal events during the long-lived Neoproterozoic subduction in the western Yangtze Block.
Investigating the effect of axial fan shrinkage obtained by centrifugal casting technology on aerodynamic characteristics
Authors: Dang Dinh Vu , Tran Linh Viet , Doan Binh Kim , Le Thang Hong Thi ,   Hanoi University of Mining and Geology, Hanoi, Vietnam
Published: May 2024

Centrifugal casting technology was developed for the application of manufacturing axial fans. In the literature, these fans were usually manufactured by injection molding, mechanical processing or heat pressing. The main characteristic of this molding technology allows the creation of thick and hollow blades. This characteristic of the blades gives useful advantages of the fan that cannot be achieved by conventional methods. The centrifugal casting technology has been applied to fabricate axial fans in recent research. However, the issue of quality control and especially the shrinkage of the resulting fan compared to the molding has not yet been considered. Therefore, more in-depth studies and approaches are required. In this study, 3D scanning method is used to evaluate the shrinkage of the blades. The used 3D scanner is the Comet L3D 5M type based on structured light (blue LED) with a 5-megapixel sensor. This device achieves high accuracy and reliability (resolution 18 μm). The theoretical basis for determining fan shrinkage compared to CAD molds is based on the following main parameters: Chord line L (mm), relative thickness Emax (%), and stagger angle ( (degrees). In addition, the aerodynamic characteristics of the proposed fan are compared to those of a fan made of aluminum (blades are identical, but different in fabricating technology). Characteristics of this aluminum rigid-fan are assumed as reference. The results showed that the difference was not large between the blades. Besides, the results of aerodynamic testing on the test bench of the two fans are almost similar. This indicates the good adaptability of the axial fan received by the centrifugal casting technology.
Metallization characteristics and gold ore controlling factors in the south region of Tra Nu - Phuoc Thanh, Quang Nam Province
Authors: Le Thu Thi ,   Hanoi University of Mining and Geology, Hanoi, Vietnam
Published: May 2024

The gold mineralization in the southern region of Tra Nu-Phuoc Thanh was initially discovered and assessed by the Central Geological Division. However, mineralization characteristics and ore-controlling factors in the Tra Nu-Phuoc Thanh area remain inadequately understood. To assess the gold mineralization potential in this research area, this study conducts a comprehensive synthesis of prior research findings, complemented by the analysis of an additional 50 thin sections, 100 thick sections, SEM scanning electron microscopy, and 10 ICP-MS samples. The research results reveal the presence of gold deposits within the study area, including native gold and electrum. The identified gold-bearing minerals in the deposits encompass quartz, pyrite, galena, sphalerite, pyrrhotite, and goethite. The ore formations predominantly exhibit disseminated, vein, and breccia structures, along with granular, semi-granular, spherical, and solid inclusions. It has been ascertained that the gold ore in the study area belongs to the gold-quartz-sulfur formation and can be categorized into two types: gold-quartz-pyrite ore and polymetallic gold-quartz-sulfur ore. The ore is primarily situated within ancient metamorphic sedimentary rocks of the Kham Duc formation and young granitoid rocks of the Ba Na complex. Typically, the gold ore body occurs in a single-vessel form, with less common branched, vascular zone, and infiltrative vascular forms. All gold ore bodies are aligned along the fault systems, primarily oriented in the northeast-southwest direction. These sub-meridian fault systems serve as conduits for hydrothermal solutions carrying gold ore in the study area.
Study of Antioxidant, Cytotoxic and Analgesic Properties of the Stem of Helicteres isora Linn
Authors: Latif Md Abdul , Md Asaduzzaman  , Yasmin Mt. Farzana , Chowdhury Mohammed Motaher Hossain , Jafreen Rehnuma , Hoque Majedul
Published: May 2024

Helicteres isora Linn., often referred to as the Indian screw tree, goes by the names Atmora or Rajot in Bangladesh. A genus of flowering plants in the Malvaceae family is called Helicteres (shrub). According to reports, extracts from fruits, roots, and bark have anti-cancer, hepatoprotective, anti-dysenteric, anti-diabetic, and antioxidant properties. To the best of our knowledge no attempts have been made for finding out therapeutic potentials of the stem part of this plant. From preliminary phytochemical screening we noticed the presence of different phytochemical constituents including the Alkaloids, glycoside, flavonoids, carbohydrates, tannins, fats & fixed oils. Where Alkaloids and fats & oils were moderately present. But steroids, saponins and Triterpenoids were absent in methanolic extract of Helicteres isora stem. The results of the present study provide scientific basis for the use of Helicteres isora in traditional medicine in the treatment of aforementioned diseases. Furthermore, some new pharmacological effects of the plant have been revealed. It is thus important that extensive phytochemical and pharmacological studies should be carried out on the basis of the results of the current study to eventually find bioactive compounds as new lead compounds.
Charting a Path to Progress: The Role of Uzbekistan's New Constitution
Authors: ugli Kamronbek Saparboyev Kamolbek
Published: May 2024

This article delves into the significance of Uzbekistan's new constitution in shaping the trajectory of the country’s progress. The author thoroughly examines the key provisions and reforms introduced in the constitution and discuss their implications for advancing democracy, governance, and human rights in Uzbekistan. By analyzing the political landscape and historical context, the article offers valuable insights into how the new constitution can foster inclusive development and modernization in the country. The author’s perspective provides a nuanced understanding of the role of legal frameworks in promoting social and political change, making this article a compelling read for those interested in constitutional law, Uzbekistan’s political evolution, and democratization in the region.
Striking a Balance: Navigating Ethical Complexity in Healthcare: A reply to Mandal, Jharna; Ponnambath, Dinoop Korol; Parija, Subhash Chandra
Authors: Fatima Zaira , Mahmood Azra
Published: May 2024

Background: Medical ethics is a rational area of moral philosophy that addresses probable outcomes and disputes in duties and obligations. There are two schools of ethics that focus on decision-making: utilitarian and deontological. While in the utilitarian method, outcomes define the means and most benefit expected for the greatest number of people, in the deontological approach, outcomes/consequences may not only justify the means to attain them. In this paper we explore the idea of striking a balance proposed by Mandal J., et al (2016) between two very strong and conflicting ethical approaches (deontological & utilitarian) viewpoints while making ethical decisions in the healthcare industry and focusing on real-world implementation challenges of these ethical approaches. We argue about the practical implication of “balance” as well as the limitations of “Dual processing theory of moral judgment”. Objectives: The objectives of this commentary are to critically analyze the concept of balance between utilitarian and deontological perspectives in ethical decision-making within healthcare and to highlight the challenges it poses in practical implementation. Conclusions: In conclusion, it is emphasized that striking a balance in healthcare ethics is important yet difficult, necessitating a dedication to compassion and honesty as well as a sophisticated grasp of ethical reasoning. In order to provide patient care that is both ethically sound and patient-centered, healthcare practitioners work to integrate utilitarian and deontological principles while taking into account a variety of contextual elements.
Etica reprezentației teatrale și limitele libertății creatoare
Authors: Vasiniuc Tiberius
Published: May 2024

Theatre represents an ingenuous form of dialogue of the self with another, a space of contradiction between freedom and alienating forms of power. By opening paths of ethics, the performing arts impose or are imposed on themselves limits that the stage performance itself continues to interrogate. Are there ways or means to sign an “agreement” between the stage creators and the audience, between the creation and the spectators, in such a way that, without infringing the right to freedom of the artists, the feelings, convictions, or beliefs of the receivers are not adversely affected? The answer comes from the very relationship that the theatre has with itself, from the way the creators understand how to manage sensitive subjects, approaching and not ignoring them, but passing them through the filter of a responsibility regarding the mission of art and the significant role which the encounter has. In contemporary theatre, there are taboo or controversial topics (for example, the representation of violence and trauma) that attract more attention than ever and continue to be perceived as sensitive depending on the cultural, social or political context in which they are presented. Thus, the limit becomes a central notion that we cannot avoid in the discussions related to the role that the theatre plays in relation to the spectators and their sufferings or sensitivities.
Sindromul Nina Zarecinaia
Authors: Purea Elena
Published: May 2024

Nina Zarechnaya is metaphorically seen in this research paper as a prototype of the apprentice in acting, as she is clearly a teenager facing the decision to engage in an artistic career and the ensuing hold-backs, such as her desperate attempts to perform, which culminate in personal and professional failure. In my paper, I have attributed a type of syndrome to this famous character, as a label for a great number of obstacles acting students have to overcome.
Între ideologie și identitate culturală (Piese cu tematică istorică la Teatrul de Stat din Sfântu Gheorghe, în anii 1960-1970)
Authors: Novák Csaba Zoltán
Published: May 2024

In the context of political liberalization in the 1960s, Hungarians in Romania, taking advantage of new cultural opportunities, quickly adapted to the new conditions. After the administrative reform, following cultural concessions, a phenomenon similar to that in Romania of reinventing and reproducing the historical past took place in Hungarian cultural institutions. Theatre played an important role in this cultural phenomenon. The State Theatre of Sfântu Gheorghe participated very actively in all the cultural initiatives to promote ethnocultural identity and local values initiated by the new political and cultural elite in Covasna County, founded in 1968. The main aim was therefore to rediscover, care for and promote the local historical past (Transylvanian and Szekler) in the context of the cultural policy of the time and the communist ideology through historical plays. The success, or lack thereof, of these plays should be sought in this context rather than in their literary and dramatic value. The theatre of Sfântu Gheorghe, in search of new forms after 1968, took up, accepted these plays, these historical themes, managed to slip them through the institutions of censorship and put them on stage. These plays are characterized by a lack of professional maturity, by ideological clichés. They are telling examples of how and to what extent the local Hungarian intelligentsia tried and failed to adapt to the new cultural conditions in the country, in these political-ideological conditions, how it tried to find Hungarian cultural alternatives and to what extent it managed to process and stage these themes.
Práticas e técnicas corporais terapêuticas: temas para estudo, prática e reflexão
Authors: de Oliveira Santos Gilbert
Published: May 2024

Esta obra nasce do desejo de divulgar a experiência adquirida com o ensino, a extensão e a pesquisa a respeito de práticas e técnicas corporais terapêuticas no contexto universitário. É um livro com corpo, imagem e palavra. Uma interpretação em imagens e textos de diferentes aspectos que abordam as relações entre o movimento e a saúde humana. São abordados temas, tais como a arte e a técnica de movimento; o autoconhecimento através do gesto; a justa medida de esforço físico; a importância da plena presença durante a prática corporal; a pessoalidade no movimentar-se; a arte marcial do Tai Chi Chuan; a ginástica terapêutica chinesa Chi Kung; as posturas psicofísicas do Hatha Yoga; os benefícios da Meditação; alguns aspectos da Medicina Clássica Chinesa relacionados ao corpo e ao gesto; o auto aperfeiçoamento através de uma prática corporal; a saúde humana e o ensino de práticas e técnicas corporais terapêuticas.