bluuebunny/crossref_metadata_2025 huggingface dataset:
Social Interaction and Power Relations in Companies: An Entropy-based Approach Using the Expert System Shell-SPIRIT
Authors: Schröer Maximilian , Reucher Elmar
Published: December 2023

The changed cooperation and organizational structure in companies are to be examined quantitatively with regard to their power structures and changes are to be revealed. The expert system Shell Symmetrical Probabilistic Intensional Reasoning in Inference Networks in Transition (Shell-SPIRIT, a.k.a., SPIRIT) is to be applied as the SPIRIT tool was already used for different applications in the context of information faithful knowledge processing, wherewith it’s achievement potential becomes visible, see, e.g., Rödder et al., Logic Journal of IGPL, Vol. 14 (2006). More recently the potential to model power structures and measure their power potentials in the SPIRIT tool has been recognized, see, e.g., Rödder et al., Decision Analytics Journal, (2021). This chapter will discuss from a practitioner’s perspective, how power structures in companies might have changed by Corona Virus Pandemic (a.k.a. Corona) in order to adequately model this in the SPIRIT tool. The chapter also presents and discusses the literature research, modeling results of power structures and rankings based on employee skills obtained from the SPIRIT tool, and their practical relevance.
Optimization Using Genetic Algorithms – Methodology with Examples from Seismic Waveform Inversion
Authors: Mallick Subhashis
Published: December 2023

Genetic algorithms use the survival of the fittest analogy from evolution theory to make random walks in the multiparameter model-space and find the model or the suite of models that best-fit the observation. Due to nonlinear nature, runtimes of genetic algorithms exponentially increase with increasing model-space size. A diversity-preserved genetic algorithm where each member of the population is given a measure of diversity and the models are selected in preference to both their objective and diversity values, and scaling the objectives using a suitably chosen scaling function can expedite computation and reduce runtimes. Starting from an initial model and the model-space defined as search intervals around it and using a new sampling strategy of generating smoothly varying initial set of random models within the specified search intervals; the proposed diversity-preserved method converges rapidly and estimates reliable models. The methodology and implementation of this new genetic algorithm optimization is described using examples from the prestack seismic waveform inversion problems. In geophysics, this new method can be useful for subsurface characterization where well-control is sparse.
Downes Score as a Predictor of Nasal Continuous Positive Airway Pressure Failure in Neonates of 28 - 36 Weeks Gestation with Respiratory Distress: A Survival Analysis
Authors: Yuniati Tetty , Permatagalih Vidi , Suryaningrat Filla Reviyani , Wahyudi Kurnia , Kadi Fiva Aprilia , Primadi Aris , Sukadi Abdurachman
Published: December 2023

Background: Respiratory distress is the most often encountered problem in preterm infants and the most frequently encountered reason for neonatal intensive care unit (NICU) admission. It can develop into respiratory failure and cause high morbidity and mortality. Noninvasive respiratory support, such as nasal continuous positive airway pressure (NCPAP), was the first line for neonates with respiratory distress. The progression of respiratory distress to respiratory failure in neonates with NCPAP (NCPAP failure) increases the need for mechanical ventilation on the first day of life. With limited resources, clinical observation is critical to predict prognosis and golden time for referral. Downes scores are the accurate and easiest measurement that is used to determine the severity and monitoring of respiratory distress in neonates. However, in Indonesia, there has still been no study that showed an effect of the increment of Downes score in 24 hours and the risk of NCPAP failure. Objectives: This study aimed to measure the association of Downes score at birth, ages 2, 6, 12, and 24 hours, and the risk of NCPAP failure in the first 72 hours using survival analysis. Methods: This prospective observational cohort study included all neonates with 28 - 36 weeks gestation born at Hasan Sadikin General Hospital, Bandung, Indonesia, within March to May 2019, with respiratory distress and NCPAP as respiratory support. Clinical monitoring was conducted using Downes score at birth, 2, 6, 12, and 24 hours of age. The time of NCPAP failure in the first 72 hours was also obtained. Survival analysis with Kaplan-Meier and Cox regression was used to determine the association. Results: This study analyzed 121 neonates at 72 hours with an overall survival rate of 70.2% and a mean survival time of 61.1 hours. Neonates born 28 < 32 weeks and birth weight 1000 - 1499 g had the lowest survival (54.5% and 56.9%). Downes score ≥ 4 at birth and 2 and 6 hours had lower survival than Downes score < 4 (67.7%, 60.5%, and 52.7%). The risk of NCPAP failure in 72 hours was increased with a higher Downes score at 2 hours (hazard ratio [HR] = 1.86 [95% confidence interval [CI]: 1.3 - 2.6, P < 0.001), 6 hours (HR = 1.67 [95% CI: 1.2 - 2.2], P < 0.001). Downes score ≥ 4 at 2 hours (3.26 times, P = 0.030) and 6 hours (2.44 times, P = 0.014) had a high risk of NCPAP failure in 72 hours. Conclusions: The increase in Downes score was associated with a high risk of NCPAP failure at 72 hours of age in preterm neonates with respiratory distress. Two to six hours of monitoring of the Downes score should be considered a critical time for referral.
Nonpuerperal chronic endometritis with pyometra causing systemic illness in a production sow
Authors: Morris Celeste , Watson Katherine , Schwartz Diana , Pereira Richard
Published: December 2023

A second parity, late pregnant, commercial mixed-breed sow was examined on a farm with a 5-day history of inappetence and lethargy that was unresponsive to treatment with flunixin meglumine. Clinical signs were suspected due to an enlarged, fluid-filled hollow abdominal organ identified via transabdominal ultrasonography. Further characterization of abdominal viscera and fluid was limited by the sensitivity of the imaging equipment. Flunixin meglumine was discontinued and a dietary supplement was added to the feed to encourage intake. Repeat transabdominal ultrasonography was performed 4 days later due to a lack of improvement with worsening lethargy, continued inappetence, and fever. The sow was euthanized because of poor prognosis, chronicity of disease, and lack of pregnancy. On necropsy, the uterine horns measured 20 cm in diameter and occupied ~ 80% of the abdominal cavity, compressing the intestines and liver. The uterine lumen contained watery, turbid fluid. The left ovary had multiple grossly appreciable corpora lutea, and right ovary had multiple corpora albicantia. Although uterine disease is poorly defined in swine, based on the gross and histologic findings this sow was diagnosed with nonpuerperal chronic endometritis with intrauterine accumulation of purulent fluid (consistent with pyometra). Additionally, the sow was diagnosed with salpingitis, interstitial nephritis, lymphadenitis, and gastric ulceration, all likely contributing to her declining health and systemic illness.
Pelatihan dan Pendampingan Peningkatan Keterampilan Akuntansi Pada UMKM "Sala Lauak Kito"
Authors: Amelia Herman Lisa , Sudiman Josephine , Djefris Dedy
Published: December 2023

The existence of Micro, Small and Medium Enterprises (MSMEs) in Indonesia is quite dominating and is the backbone that supports economic growth and provides jobs. Its existence needs to be appreciated and developed by providing access to financing, guidance and assistance so that it can develop its business. Training and mentoring activities are carried out in order to improve accounting skills for one of the micro businesses in Padang City "UD. Sala Lauak Kito. There is a need for partners to gain knowledge and understanding of accounting books and the ability to make financial reports. Until now, partners have not carried out the bookkeeping process so that cost and income information is not generated accurately. Implementation of activities consists of three stages: planning, implementation and final stage. Overall, all stages were carried out for 2 months. From planning to final stage. The training was carried out for 1 day and mentoring was carried out 1 month after the training. The method of implementation is in the form of material explanation presentations, exercises, discussions, question and answer discussions and independent learning through modules. The training material provided is in the form of knowledge related to the accounting cycle from recording to financial reporting. After the implementation of the activities there is an increase in accounting knowledge, the creation of complete and valid financial information, the existence of documented bookkeeping, the preparation of financial reports as information from the business. The output of this activity is the publication of print/digital newspapers and activity videos via YouTube media.
Organigrama semántico de una familia etimológica: el español maca ‘señal que queda en la fruta por algún daño recibido’ y sus cognados románicos
Authors: Georgescu Simona
Published: December 2023

En el caso de las etimologías desconocidas o inciertas, donde el recurso exclusivo a las leyes fonéticas conocidas ha demostrado su ineficacia, una perspectiva semántica resulta ser el primer paso necesario en la investigación. Tomando como eje metodológico el modelo de análisis semántico propuesto en Georgescu (2021) y el método de la gramática comparada – reconstrucción (cf. Buchi y Schweickard, 2014), una vez identificados los cognados románicos del español maca, rastreamos los patrones recurrentes de evolución semántica que definen esta familia etimológica, lo que nos permitirá visualizar la posición de la palabra española dentro de la red conceptual. Así, se podrá observar que lexemas antes tratados por separado en la lexicografía se originan, de hecho, en un mismo étimo cuyo significado primario se relaciona con la idea de ‘ímpetu’. La reconstrucción a raíz de la gramática comparada conduce a la postulación de un prototipo */'makk-/, que solo podría interpretarse como una raíz onomatopéyica, expresión básica de un movimiento brusco.
Chávez Fajardo, Soledad (2022): Diccionarios del fin del mundo, Santiago de Chile, Fondo de Cultura Económica. 228 pp. ISBN: 978-956-289-248-3.
Authors: Carriazo Ruiz José Ramón
Published: December 2023

Reseña de la obra: Chávez Fajardo, Soledad (2022): Diccionarios del fin del mundo, Santiago de Chile, Fondo de Cultura Económica. 228 pp. ISBN: 978-956-289-248-3.
Effectiveness of Parent Teacher School Management Committee on Quality of Education in Public Secondary School of Tehsil Hub, District Lasbela
Authors: Abdul Qayoom
Published: December 2023

Parental involvement in school activities, such as Parent, Teachers, and School Management Committees (PTSMCs), is crucial for improving education quality. This study aims to explore how parents can participate in school learning activities, enabling students to achieve high grades. The study found that most parents believe they are no longer responsible for their children's education, educators oppose parental meddling in school matters, and parents oppose parental meddling in school matters. To compare the effectiveness of education provided by Tehsil Hub of District Lasbela, eight high schools were selected, and 100 participants participated using both qualitative and quantitative research methods. Open-ended questions were used for teachers and parents, while closed-ended questions were used for students. The study found that PTSMC is effective based on firsthand observation. Using a Likert scale questionnaire, the students assessed the quality of PTSMCs performance on several dimensions. The questions on the questionnaire are all closed-ended, making statistical analysis and quantification of the data easy. Data were gathered using a questionnaire, semi-structured interviews, and all available administrative documents. Data was collected through in-person visits and subsequently subjected to statistical and content analysis. There were recommendations given considering the findings.
Nonlinear buckling and postbuckling of spiral stiffened FG-GPLRC cylindrical shells subjected to torsional loads
Authors: Le Kha Hoa , Vu Tho Hung , Pham Hong Quan , Vu Hoai Nam
Published: December 2023

The nonlinear buckling behavior of functionally graded graphene platelet reinforced composite (FG-GPLRC) cylindrical shells reinforced by ring, stringer and/or spiral FG-GPLRC stiffeners under torsional loads is studied by an analytical approach. The governing equations are based on the Donnell shell theory with geometrical nonlinearity of von Kármán-Donnell-type, combining the improvability of Lekhnitskii’s smeared stiffeners technique for spiral FG-GPLRC stiffeners. The effects of mechanical and thermal loads are considered in this paper. The number of spiral stiffeners, stiffener angle, and graphene volume fraction, are numerically investigated. A very large effect of spiral FG-GPLRC stiffeners on the nonlinear buckling behavior of shells in comparison with orthogonal FG-GPLRC stiffeners is approved in numerical results.
Optimizing the architecture of the artificial neural network by genetic algorithm to improve the predictability of pile bearing capacity based on CPT results
Authors: Phạm Tuấn Anh , Vu Huong-Lan Thi
Published: December 2023

This paper presents the results of applying the Artificial Neural Network (ANN) model in determining pile bearing capacity. The traditional methods used to calculate the bearing capacity of piles still have many disadvantages that need to be overcome such as high cost, complicated calculation, time-consuming. Currently, Artificial Intelligence (AI) is a useful tool that is applied in many fields to save time and costs. The study develops an ANN model and optimizes the architecture, using the Genetic Algorithm (GA) to determine the pile bearing capacity. A dataset of 108 pile static compression results is used to train and test the model. The results of the study are compared with the experimental formula according to Vietnamese nation standard TCVN 10304:2014, showing that the ANN model with well optimized, allowing prediction of pile bearing capacity close to experimental results and better than the formula in nation standard. Specifically, the ANN model gives 12% and 32.4% better performance, respectively, than the empirical formula on R2 and RMSE criteria, respectively. The results of the study are a premise for the application of AI in solving pile problems in the field of construction.
Application of an artificial neural network and QCM sensor coated with γ-Fe2O3 nanoparticles for estimation of SO2 gas sensing characteristics
Authors: Vinh Nguyen Thanh  , Tran Quoc Tuan  , Nguyen Van Cuong  , Cao Xuan Truong  , Nguyen Van Quy
Published: December 2023

γ-Fe2O3 nanoparticles (NPs) were synthesized by co-precipitation method and a following annealing treatment at 200 °C in ambient air for 6 hours. A mass-type sensor was prepared by coating γ-Fe2O3 NPs on the active electrode of quartz crystal microbalance (QCM). The obtained results of the γ-Fe2O3 NPs based QCM sensor indicate the high response and good repeatability toward SO2 gas in the range of 2.5 – 20 ppm at room temperature. Moreover, the frequency shift (DF) and change in mass of SO2 adsorption per unit area (Dm) of the γ-Fe2O3 NPs coated QCM sensor have a relationship with the mass density of γ-Fe2O3 NPs and SO2 concentrations. The artificial neural network (ANN) model using Levenberg-Marquardt optimization was used to handle the DF and Dm of the γ-Fe2O3 NPs coated QCM sensor. The results of the model validation proved to be a reliable way between the experiment and prediction values.
Prediction and sensitivity analysis of self compacting concrete slump flow by random forest algorithm
Authors: Kumar Raghvendra , Mai Hai-Van Thi
Published: December 2023

Self-compacting concrete (SCC) is a construction material with many advantages, including high performance and the capacity to self-compact without mechanical vibration. As a result, SCC is widely used in construction, especially at locations where concrete structures are difficult to construct. Filling ability is one of the three basic requirements that must be met when designing the SCC mix. The slump flow (SF) is used to determine the SCC mixture's filling capacity. As a result, it is critical to estimate this number fast and precisely. The purpose of this study is to propose the use of a random forest (RF) model to predict the SF of SCC and to assess the effect of input parameters on output parameters. The study constructed the RF model using a dataset of 507 experimental results collected, which is the biggest data collection compared to previous studies on this subject. Additionally, a 10-fold cross-validation approach is used to improve the model's prediction performance. As a result, the performance assessment criteria for the testing dataset have values of RMSE = 59.5664 mm, MAE = 32.4483 mm, and R = 0.8614, respectively. This result shows that the RF model is an effective tool in predicting the SF of SCC.
Investigation in manufacturing self-healing cementitious materials using microbial technology
Authors: Tran Van Quan , Giap Van Loi
Published: December 2023

Small cracks are inherent in cementitious-based structures. This causes deterioration of buildings, reducing the bearing capacity of structures due to the invasion of harmful substances as well as corrosion of reinforcement in cementitious material. Therefore, the cementitious material needs to be restored and these voids filled. Self-healing cementitious material has been strongly developed for long time in the world. However, this technology has not been popular in Vietnam. Therefore, the aim of this paper is to find the appropriate mix-design for creating self-healing cementitious material in Vietnam conditions. Experimental results show that the mixture including bacillus subtilis and calcium lactate can be used for creating the self-healing cementitious materials. Mixing directly the mixture in the cement is selected to manufacture the self-healing cementitious materials. It seems that the width of crack affects more on healing ability than the length of crack.
Synthesis and CO gas adsorption properties of GO/ZnFe2O4 nanocomposites
Authors: Vinh Thanh Nguyen  , Tuan Quoc Tran  , Cuong Van Nguyen  , Hung Van Nguyen  , Hai Thanh Nguyen  , Hang Thi Bui  , Dang Van Tran  , Quy Van Nguyen
Published: December 2023

In this work, ZnFe2O4 nanoparticles were synthesized by hydrothermal method while the hummer method was used to synthesize GO nanosheet. GO/ZnFe2O4 nanocomposites (GO/ZFO) were prepared by mixing of GO with ZnFe2O4 in mass ratio of 1:99, respectively. The structure, morphology, and physical – chemical characteristics were determined by Raman spectroscopy, Transform Electron Microscopy (TEM), and Fourier Transform Infrared Spectroscopy (FT-IR). The CO gas adsorption properties of GO/ZFO were investigated in the range of 25 – 200 ppm at room temperature using quartz crystal microbalance (QCM). GO/ZFO nanocomposites show great adsorption – desorption capacity, high repeatability, and the largest adsorption performance of 1.21‰ (0.098 µg.cm-2 at 200 ppm). The results show that this new approach is promising of spinel structure materials for CO adsorption at room temperature.
Durability of mortar and concrete containing pozzolans as a partial cement replacement in the marine environment: a review
Authors: Ho Lanh Si , Huong Thi Thanh Ngo  , Hieu Trung Vu  , Sang Thanh Nguyen  , Vinh Ngoc Chau  , Viet Quoc Dang
Published: December 2023

This paper reviews the durability of concrete containing pozzolans in marine environments, which mainly focuses on resistance to chloride ion penetration and sulfate attack. The results of previous literature showed that the main ions of seawater are almost similar but the salinity varies with location. The mechanism of chemical reaction between seawater and concrete was carefully reviewed and explained. Besides, the main attacks that caused the degradation of concrete structures in marine conditions were summarized. The results of previous research indicated that using pozzolans (fly ash, slag, metakaolin, rice husk ash, etc.) as a partial cement replacement in concrete improved the durability of concrete such as resistance to chloride ion penetration and resistance to sulfate. The use of pozzolans not only improves the durability of concrete in the marine environment but also solves environmental impacts such as reducing CO2 emissions and landfilling areas. It can be concluded that the utilization of pozzolans in concrete, particularly in marine concrete structures is a promising approach for sustainable development.
Assessment of Liver Enzymes among Gold Mining Workers in Alabedia Souk Nile River Sudan
Authors: Saad Yassin , Abdelhamid Hisham , Abdelhamid Mona , Khidir Awatif , Nouraldein Mohammed Hamad Mosab
Published: December 2023

This study aims to measure the liver enzymes among gold mining workers and compare them with a group of healthy subjects as a control sample. This cross-sectional study was conducted Alabedia market, Nile River, Sudan. The study included 70 people, the gold prospectors by mercury as a test group (50 people) and healthy (20 people) as a control group. The venous blood samples were collected from the two groups to measure the rates of Hg liver enzymes. Statistical analysis of the results reviled that, there was a significant increase in serum level of ALP in the test group (82.8 IU/L) when compared with the control group (70.25.1IU/L) with a P. value of 0.013, and an increase in serum level of ALT in the test group was (21.18 IU/L) when compared with a control group of (26.96.1IU/L) with P. value of 0.003. Statistical analysis of the results reviled that, there was no significant increase in serum level of AST when compared with a control group with a P-value of 0.071. The mean level of serum mercury in the test group was (62.17) and in the control group was (0.72) with P. value of <0.001. This study established that there is a significant increase in the levels of serum mercury compared to the control group. The new workers are more exposed to mercury than the older workers because the new workers have no experience in contact with gold mining extraction.
فاعلية استخدام تكنولوجياالتعليم
Authors: الماحي الطاهر الماحي عمر
Published: December 2023

This study is introduced under the title of ((The effectiveness of using learning technology to raise the learning efficiency of teaching staff members of the Sudanese universities according to quality standards. The study aimed to know how the effect of using learning technology and its role in raising learning efficiency for the teaching staff members. The major problem appeared in the question ((How do the Sudanese universities benefit from learning technology in raising the efficiency of the member of the teaching staff. The researcher used the descriptive method and the survey tool in collecting information with the help of SPSS program for statistical analysis. The study community included teaching staff member of (Nile Valley University -Faculty of Education and college of teachers). A random sample of 60 members was chosen out of 125 members. (Total number). The most important result of the study are: It raises the efficiency of the staff members, It improves the output quality of the learning operation, and It develops positive trends for staff members when it is used in teaching.In the light at these results the researcher recommends that learning technology skills should be developed for the teaching staff members.
صراع التنشئة الاجتماعية بين مؤسستي الأسرة وجماعة الرفاق
Authors: أبكر أحمد عبد الله المعز , بله عوض السيد وجدان
Published: December 2023

تهدف هذه الدراسة إلى التعرف على واقع العلاقة بين الأسرة وجماعة الرفاق كمؤسسات للتنشئة الاجتماعية بمدارس مرحلة الأساس بمدينة شندي ، الواقعة في النصف الجنوبي لولاية نهر النيل ، شمال السودان ، على بعد (100) ميل تقريباً إلى الشمال من مدينة الخرطوم ، والكشف عن تأثير جماعة الرفاق في التنشئة الاجتماعية ودور الأسرة من خلال المراقبة والضبط الاجتماعي للأطفال الموجودين في الشارع .
استخدمت الدراسة المنهج الوصفي التحليلي وجمعت البيانات الأولية من خلال الاستبانه مع الذين تنطبق عليهم شروط الدراسة .
وقد خلصت الدراسة إلى أن جماعة الرفاق ليس بديلاً للأسرة كمؤسسة للتنشئة الاجتماعية ، وأن هنالك عدم توافق بين ما يتعلمه الطفل في الأسرة وبين ما يتعلمه من الرفاق . وأوصت الدراسة بضرورة تفعيل دور الأسرة كمؤسسة للتنشئة الاجتماعية وضرورة أن يخصص الأباء والامهات جزءاً من وقتهم لأبنائهم من أجل محاربة الفراغ العاطفي لدي الأبناء بالتواصل البناء مع أبائهم .
نشر مضمون الكراهيةعلى شبكات التواصل الاجتماعي وانعكاساته السالبة على واقع المجتمعات
Authors: يوسف احمد حسن , فرح كرم الله وقيع الله محمد
Published: December 2023

This study aims mainly to find out the negative effects that can be reflect on societies due to the dissemination of hate speech on social networks. The study took the Sudanese society as model. By studying the trends of the study sample, for the period from the fall of the former president‘s regime on 11/4/2019, to the year 2022AD.This study is considered one of the descriptive studies, using the descriptive survey method to reach its objectives, and the use of the questionnaire tool as a means of collecting data from the study community in the professors of Wady Anile University and Sheikh Abdullah Al – Badry.The study reached a set of results, the most important of which is that most members of the study sample believe that the most important negative repercussions on Sudanese society due to the dissemination of hate speech on social networks are: the strengthening of tribal influence, the emergence of voices talking about persecution because of religious affiliation, the emergence of some voices calling for separation from the Greater Sudan, the spread of followers of political parties, the emergence of cases of insecurity, the emergence of Women‘s groups claiming to subvert Women‘s rights, the spread of some cases of verbal and physical violence exchanged between the security forces and civilians, in addition to the fact that the security forces did not become accustomed to the lawlessness around.
GEOGRAFIC INFORMATION SYSTEM PARIWISATA KABUPATEN TEGAL BERBASISKAN WEBSAIT
Authors: Din Ulummud , Fortuna Zulfa Puspa
Published: December 2023

Sebagai salah satu kabupaten di jawa tengah yang memiliki beragam obyek pariwisata Kabupaten tegal mempunyai potensi pariwisata yakni wisata alam, wisata sejarah, wisata religi, wisata keluarga dan wisata kuliner. Kabupaten Tegal merupakan salah satu daerah kabupaten di Propinsi Jawa Tengah dengan Ibu Kota Slawi. Terletak pada posisi 108° 57’ 6” – 109° 21’ 30” Bujur Timur dan 6° 50’ 41’’ - 7° 15’ 30” Lintang Selatan. Luas wilayah Kabupaten Tegal, adalah berupa daratan seluas 878,79 km2. Berdasarkan wilayah administrasinya Kabupaten Tegal bagian utara berbatasan dengan Kota Tegal dan Laut Jawa, bagian timur berbatasan dengan Kabupaten Pemalang, bagian selatan berbatasan dengan Kabupaten Brebes dan Kabupaten Banyumas, dan bagian barat berbatasan dengan Kabupaten Brebes.
Differentiation of linear algebras with a unit over a field
Authors: Sultanov A.Ya. , Glebova M.V. , Sultanova G.A.
Published: December 2023

Linear algebras over a given field arise when studying various problems of algebra, analysis and geometry. The operation of differentiation, which originated in mathematical analysis, was transferred to the theory of linear algebras over a field, as well as to the theory of rings.

The set of all differentiations of a linear algebra themselves form a linear algebra. This algebra is called the algebra of differentiations. At the same time, this algebra admits the structure of a Lie algebra. If the algebra whose differentiations are considered is finite-dimensional, then its Lie algebra of differentiations will also be finite-dimensional. Therefore, the­re is a natural problem of determining the dimension of the Lie algebras of the differentiations of the linear algebra under consideration or to obtain an estimate from above of the dimension of the algebra of differentiations.

To solve these problems, a system of linear homogeneous equations is obtained, which is satisfied by the components of arbitrary differen­tia­tion. Evaluation of the rank of this system allows us to obtain an estimate from below of the rank of the matrix under consideration.
Bianchi transformation of the pseudosphere
Authors: Cheshkova M.A.
Published: December 2023

The work is devoted to the study of the Bianchi transform for surfa­ces of constant negative Gaussian curvature. The surfaces of rotation of cons­tant negative Gaussian curvature are the Minding top, the Minding coil, the pseudosphere (Beltrami surface). Surfaces of constant negative Gaus­sian curvature also include Kuens surface and the Dinis surface. The study of surfaces of constant negative Gaussian curvature (pseudosphe­ri­cal surfaces) is of great importance for the interpretation of Lobachevsky planimetry. The connection of the geometric characteristics of pseudos­phe­rical surfaces with the theory of networks, with the theory of solitons, with nonlinear differential equations and sin-Gordon equations is estab­li­shed. The sin-Gordon equation plays an important role in modern physics. Bianchi transformations make it possible to obtain new pseudospherical surfaces from a given pseudospherical surface. The Bianchi transform for the pseudosphere is constructed. Using a mathematical package, the pseu­dos­phere and its Bianchi transform are constructed.
Linear and projective connections over a smooth manifold
Authors: Shevchenko Yu. I. , Vyalova A.V.
Published: December 2023

The principal bundles of the first order coframes and the second order coframes, as well as factor bundle of centroprojective (coaffine) coframes are considered. In the bundle of linear coframes a connection is given with the help of the field of connection object. The torsion and curvature tensors of this linear connection are determined. Special connections are singled out: torsion-free, curvature-free. The space of a linear connection devoid of torsion and curvature is an affine group, that served as the basis for classical name «affine connection».

Under the specializations of a manifold, strong and weak projectivity conditions was introduced, which make it possible to single out the cof­ra­me bundles. The connections in these principal bundles are called strong and weak projective connections.

In the case of symmetric linear connection, when the torsion is absent, the object of classic projective connection is considered. Connec­tion forms are introduced and their structure equations are found. Hence it follows that classic projective connection is neither fundamental-group nor linear differential-geometric. It is proved, that the curvature object of this connection forms a quasitensor together with the connection object only. It is shown, that classic projective connection degenerates into diffe­rent from the original linear connection on the image of a section of some homogeneous bundle.
Tác dụng làm lành vết thương và tính kích ứng da của cao chiết và chế phẩm kem chứa cao chiết lá Chùm ngây trên thực nghiệm
Authors: Lý Hải Triều Lý Hải Triều , Lê Thị Kim Oanh Lê Thị Kim Oanh , Đinh Trường Sơn Đinh Trường Sơn , Lâm Bích Thảo Lâm Bích Thảo , Lê Quí Trí Lê Quí Trí , Nguyễn Thị Thu Hương Nguyễn Thị Thu Hương , Lê Văn Minh Lê Văn Minh
Published: December 2023

Đặt vấn đề: Các sản phẩm từ thảo dược được sử dụng phổ biến để chữa lành vết thương. Lá Chùm ngây (Moringa oleifera Lam.) được biết có khả năng làm lành vết thương. Mục tiêu: Khảo sát tác dụng làm lành vết thương và tính kích ứng da của cao chiết và chế phẩm dạng kem có chứa cao lá Chùm ngây. Đối tượng và phương pháp: Mô hình chuột cắt da gây vết thương hở được áp dụng để khảo sát tác dụng làm lành vết thương của cao chiết và chế phẩm. Tính kích ứng da của cao chiết và chế phẩm được đánh giá bằng thử nghiệm kích ứng da thỏ. Kết quả: Cao lá Chùm ngây nồng độ 7.5% w/v có tác dụng làm lành vết thương tốt hơn các nồng độ khác thông qua khả năng làm giảm diện tích vết thương. Điều trị vết thương với chế phẩm kem có chứa 7.5% w/v cao lá Chùm ngây đã làm tăng đáng kể sự co vết thương sau 3 ngày điều trị. Hơn nữa, cao chiết nồng độ 7.5% và chế phẩm kem có khả năng tái tạo cấu trúc mô da tại vùng vết thương sau 11 ngày điều trị. Mặt khác, cao chiết và chế phẩm gây kích ứng không đáng kể trên da thỏ. Kết luận: Cao chiết và chế phẩm kem chứa cao lá Chùm ngây ở nồng độ 7.5% có tác dụng làm lành vết thương chuột và an toàn trên da thỏ.
Nghiên cứu thành phần hóa học của dược liệu Cỏ bắc (Leersia hexandra Sw., Poaceae)
Authors: Tô Hoàng Thít Tô Hoàng Thít , Huỳnh Trần Quốc Dũng Huỳnh Trần Quốc Dũng , Phan Thị Thủy Tiên Phan Thị Thủy Tiên , Phạm Ngọc Thạc Phạm Ngọc Thạc
Published: December 2023

Huyện Tam Nông, tỉnh Đồng Tháp có sản lượng Cỏ bắc rất lớn, tồn tại dưới dạng quần xã thực vật đặc trưng cho vùng đất ngập nước là lúa ma – Cỏ bắc (Oryza rufipugon – Leersia hexandra) với diện tích khoảng 160 ha. Cỏ bắc (Leersia hexandra) là vị thuốc dân gian, có nhiều ở vùng Tam Nông, Đồng Tháp, được người dân sử dụng làm thuốc định hướng điều trị các bệnh về gan, chủ yếu dưới dạng thuốc sắc. Tuy nhiên, chưa có nhiều nghiên cứu chi tiết về thành phần hóa học của Cỏ bắc. Từ nguyên liệu Cỏ bắc khô (toàn cây, trừ rễ), nhóm nghiên cứu đã sử dụng các kỹ thuật sắc ký hiện đại như chiết lỏng - lỏng, sắc ký cột pha thuận, sắc ký cột pha đảo để phân lập các hợp chất thiên nhiên có trong Cỏ bắc và sử dụng các phương pháp phân tích quang phổ hiện đại như MS, NMR để xác định cấu trúc hóa học của các hợp chất đó. Kết quả đã phân lập được một lượng lớn 3 hợp chất. Chúng được xác định là syringaresinol, mayuenolid và ciwujiaton.
Chiết xuất và đánh giá hoạt tính kháng ung thư của thân rễ Ngải tím (Kaempferia parviflora) ở vùng Thất Sơn - An Giang
Authors: Hồ Thị Thạch Thúy Hồ Thị Thạch Thúy , Lê Thị Tường Vi Lê Thị Tường Vi , Đặng Thị Lệ Thủy Đặng Thị Lệ Thủy , Lý Hồng Hương Hạ Lý Hồng Hương Hạ , Phạm Cảnh Em Phạm Cảnh Em
Published: December 2023

Kaempferia parviflora Wall. Ex Baker được biết đến là gừng đen hay ở Việt Nam gọi là Ngải tím, là một loại cây nổi tiếng thuộc họ Zingiberaceae, được dân gian dùng chữa đau bụng, nhuận tràng, vết thương và tiêu chảy. Kaempferia parviflora đã được chứng minh có một số tác dụng dược lý bao gồm chống co thắt, kháng nấm, kháng khuẩn và kháng ung thư. Trong nghiên cứu này, mục đích là khảo sát hàm lượng phenolic tổng (TPC) và hàm lượng flavonoid tổng (TFC) cũng như đánh giá hoạt tính kháng ung thư in vitro của cao chiết Ngải tím tại vùng Thất Sơn - An Giang với các dung môi chiết xuất khác nhau bằng phương pháp thông thường. Kết quả cho thấy cao chiết ethanol cho hiệu suất chiết tốt (18.39%) cũng như hàm lượng TPC (82.06 mg GAE/g) và TFC (70.95 mg QE/g) cao so với các cao chiết khác. Đặc biệt, cao chiết ethanol còn thể hiện hoạt tính kháng ung thư in vitro tốt trên các dòng tế bào MCF7, T47D, SKOV3, TOV-21G và Hela với giá trị IC50 nằm trong khoảng từ 31.67 đến 518.06 µg/mL so với thuốc đối chứng paclitaxel (IC50 = 0.12-5.38 µg/mL). Do đó, những phát hiện này cung cấp bằng chứng về hoạt tính kháng ung thư của cao xuất ethanol Kaempferia parviflora trên các dòng tế bào ung thư vú, cổ tử cung và buồng trứng, đồng thời gợi ý khả năng sử dụng cao chiết như một phương pháp thay thế để phòng ngừa và điều trị ung thư ở phụ nữ.
Chiết xuất và tối ưu hóa hoạt tính chống oxy hóa của cao chiết lá Đinh lăng (Polyscias fruticosa (L.) Harms) với sự hỗ trợ của vi sóng
Authors: Đặng Thị Lệ Thủy Đặng Thị Lệ Thủy , Lê Thị Tường Vi Lê Thị Tường Vi , Lý Hồng Hương Hạ Lý Hồng Hương Hạ , Phạm Cảnh Em Phạm Cảnh Em
Published: December 2023

Polyscias fruticosa (L.) Harms thuộc họ Araliaceae và được sử dụng làm dược liệu với hoạt tính dược lý đa dạng như chống trầm cảm, chống căng thẳng, cải thiện trí nhớ, chống oxy hóa, hạ đường huyết, bảo vệ gan, hạ lipid máu, kháng nấm và kháng khuẩn. Ngoài ra, lá Polyscias fruticosa còn chứa nhiều các hoạt chất như phenolic, flavonoid, diệp lục,... có hoạt tính chống oxy hóa tốt. Nghiên cứu này khảo sát hàm lượng phenolic tổng (TPC), hàm lượng flavonoid tổng (TFC) và hoạt tính chống oxy hóa in vitro của cao chiết từ lá Đinh lăng bằng phương pháp hỗ trợ vi sóng. Kết quả cho thấy quá trình chiết sử dụng dung môi ethanol 90%, tỷ lệ nguyên liệu/dung môi 1:20 (wt/v), công suất vi sóng 200 W, thời gian chiết 15 phút bằng phương pháp hỗ trợ vi sóng đã cải thiện đáng kể hiệu suất chiết (33.50%), TPC (60.91 mg GAE/100 mg), TFC (62.88 mg QE/g) và hoạt tính chống oxy hóa (IC50 DPPH = 20.38 µg/mL và IC50 ABTS = 12.60 µg/mL) so với phương pháp thông thường. Do đó, cao chiết tối ưu này thể hiện dược tính tiềm năng để phát triển dược liệu có hoạt tính chống oxy hóa trong tương lai.
Kinh nghiệm thực hiện chương trình đào tạo nhân lực quản lý đô thị của một số quốc gia Đông Nam Á
Authors: Trương Hoàng Trương Trương Hoàng Trương , Vương Quốc Trung Vương Quốc Trung
Published: December 2023

Đô thị hóa là quá trình tất yếu trong quá trình phát triển của xã hội hiện đại. Trong bối cảnh toàn cầu hóa và cuộc cách mạng công nghiệp 4.0 phát triển mạnh mẽ, yêu cầu về phẩm chất, trình độ chuyên môn, nghiệp vụ của đội ngũ cán bộ quản lý đô thị ngày càng phải đặt ra cao hơn. Tuy nhiên, chương trình đào tạo quản lý phát triển đô thị ở một số trường đại học còn hạn chế, chưa đáp ứng nhu cầu về số lượng và chất lượng. Bài viết này nhóm tác giả sử dụng phương pháp thứ cấp tổng hợp các tư liệu, bài giảng quản lý đô thị của các nước Đông Nam Á, từ đó nhóm tác giả phân tích so sánh các chương trình đào tạo cán bộ trong ngành quản lý đô thị ở các nước Đông Nam Á. Đồng thời, nhóm tác giả dựa trên những kinh nghiệm của các nước Đông Nam Á đưa ra một số khuyến nghị cho chương trình đào tạo cán bộ quản lý đô thị.
Phương pháp sinh trình điều khiển fuzzing trong kiểm thử thư viện phần mềm với điều kiện thiếu thông tin về ngữ cảnh sử dụng
Authors: Phùng Thế Bảo Phùng Thế Bảo , Trần Chí Thiện Trần Chí Thiện , Tạ Hữu Vinh Tạ Hữu Vinh
Published: December 2023

Kiểm thử fuzzing đóng vai trò quan trọng trong vòng tuần hoàn phát triển phần mềm an toàn. Đối với các thư viện phần mềm đòi hỏi phải xây dựng các trình điều khiển fuzzing (fuzz driver) để phân phối và thực thi các mẫu kiểm cho các hàm trong thư viện. Các nghiên cứu liên quan chủ yếu trích xuất ngữ cảnh sử dụng của thư viện được kiểm trong các phần mềm khác để xây dựng trình điều khiển fuzzing, điều này dẫn đến việc không kiểm tra, đánh giá được hết các hàm được định nghĩa trong thư viện, hoặc không đánh giá, kiểm tra được trong điều kiện thư viện được kiểm chưa được sử dụng trong bất kỳ phần mềm nào. Bài báo đề xuất phương pháp tự động sinh các trình điều khiển fuzzing cho các thư viện ngôn ngữ C/C++ trong điều kiện thiếu thông tin về ngữ cảnh sử dụng thư viện được kiểm. So với việc viết thủ công các trình điều khiển fuzzing cho một số thư viện phổ biến phương pháp này đã sinh được số trình điều khiển vượt trội, giúp giảm thời gian viết mã cho các trình điều khiển fuzzing. Bên cạnh đó, ứng dụng phương pháp được đề xuất giúp phát hiện một số lỗi trong các thư viện phần phổ biến: libpng, pugixml.
Building the Space Elevator Tether
Authors:   International Space Elevator Consortium, Wright Dennis H
Published: December 2023

A simple Earth-based space elevator consists of a cable or tether extending from the surface to well beyond geosynchronous orbit. A climber grips the tether, pulling itself upward and delivering payload to space. For a space elevator to be feasible, the material from which the tether is built must be strong enough that the tether can support itself and any climbers that ascend it. Three such materials exist today and their industrial-scale production seems near at hand. These materials are compared and, based on previous studies, required improvements for each are listed. The material properties, along with the load, determine the shape and mass of the tether. Two example tether shapes are shown: one using the constant stress model and another which takes into account atmospheric winds and orbital debris. Options for tether construction are discussed. These are influenced by the material fabrication process, the way in which materials are combined and arranged in the tether and how much of the fabrication takes place on Earth or in space. Keywords: Space Elevators, Strong Materials, Tether Construction
Breakthrough Sun Diving: The Rectilinear Option
Authors:   Physics. Dept., New York City College of Technology, Matloff Greg , Johnson Les
Published: December 2023

A near-term possibility for utilization of Breakthrough Initiatives Project Starshot technology is application of the sun diving maneuver as a replacement for laser acceleration of highly miniaturized photon sails to interstellar velocities. This possibility was discussed during the June 2022 Breakthrough Discuss meeting in Santa Cruz California. Here, we consider application of statite-type photon sail probes to achieve rectilinear trajectories to explore outer solar system and near-interstellar destinations. Statite-Type solar photon sails are sufficiently thin and reflective that solar radiation pressure force on the sail exactly balances the solar gravitational force. In such a force-free environment, the spacecraft exits the solar system at its pre-sail-deployment solar-orbital velocity. Here we consider departures from a circular 1 AU solar orbit, the perihelion of a 0.7-1 AU elliptical solar orbit and the perihelion of a 0.3-1 AU solar orbit. Possible outer-solar system destinations of possible interest to Breakthrough Initiatives extraterrestrial-life/artifact -search researchers include Europa, Titan, Enceladus, Methone, and Arrokoth. More distant possible objectives are ‘Oumuamua and the Sun’s inner gravitational focus. To achieve a rectilinear trajectory, the sail must be oriented normal to the Sun and spacecraft areal mass thickness is 1.46 × 10-3 kg/m2. Current sail technology is reviewed to determine whether it can achieve the required areal mass thickness.
Zeitungsdatenbanken: Lass uns das Ding drehn
Authors: Braun Ilja
Published: December 2023

Während Tauschbörsennutzer als Raubkopierer kriminalisiert werden, organisieren deutsche Zeitungen den umfangreichsten Urheberrechtsklau seit Anbruch des Digitalzeitalters. Ilja Braun berichtet, wie Online-Zeitungsarchive mit Texten freier Autoren umgehen.
USA: Streit um Online-Videorekorder wird zum Politikum
Authors: Gehring Robert A.
Published: December 2023

Die gerichtliche Auseinandersetzung um die Zulässigkeit von Online-Videorekordern in den USA wird die kommende US-Regierung beschäftigen. Der Supreme Court hat seine Entscheidung vertagt und das Justizministerium um eine Stellungnahme gebeten. Die Zukunft des Videorekorders liegt im Netz. Davon sind jedenfalls die Kabelanbieter in den USA überzeugt.
Mal wieder im Rampenlicht: das iRights.info-Buch
Authors: Spielkamp Matthias
Published: December 2023

Rüdiger Lühr hat in der Medienzeitschrift “M – MENSCHEN – MACHEN – MEDIEN”, herausgegeben von der Deutschen JournalisteInnen-Union (dju) in verdi, unser Buch rezensiert. Leider wissen wir noch immer nicht, wann der Nachdruck erscheint. Die erste Auflage ist ja auch  erst seit sieben Monaten vergriffen… Da bleibt einem wirklich nur Galgenhumor.
Rechtsausschuss des Europaparlaments spricht sich für Verlängerung der Schutzdauer auf Musikwerke aus
Authors: Spielkamp Matthias
Published: December 2023

Obwohl es in letzter Zeit so aussah, als könnten die Gegner der Schutzdauerverlängerung die Oberhand gewinnen, hat jetzt der Rechtsausschuss des EU-Parlaments der Schutzdauerverlängerung zugestimmt, wie in einer Pressemitteilung bekannt gegeben wurde (bisher nur auf Englisch): Das dürfte eine herbe Enttäuschung sein für diejenigen, die stichhaltige empirische Belege dafür vorweisen können, dass diese Schutzdauerverlängerung in erster Linie den
Internetsperre für irische Filesharer
Authors: Gehring Robert A.
Published: December 2023

Der größte irische Internetprovider, Eircom, hat sich vor Gericht mit den vier weltgrößten Plattenfirmen geeinigt, in Zukunft aktiv gegen illegales Filesharing in seinen Netzen vorzugehen. Eircom wird eine so genannte “Three-Strikes-Policy” praktizieren. Bei Universal, Sony, EMI und Warner dürften gestern die Champagner-Korken geknallt haben.
EuGH-Entscheidung zum Datenbankrecht
Authors: Gehring Robert A.
Published: December 2023

Der Europäische Gerichtshof hat sich in Antwort auf eine Anfrage des Bundesgerichtshofs für eine weite Auslegung der EU-Datenbankrichtlinie von 1996 ausgesprochen. Dem EuGH zufolge kann die Übernahme von Elemente einer Datenbank aus einer Bildschirmanzeige eine Rechtsverletzung darstellen.
Stiftung Preußische Schlösser und Gärten gewinnt Fotostreit
Authors: Gehring Robert A.
Published: December 2023

Im Streit um die Vermarktung von Fotos aus Potsdamer Parkanlagen hat sich die Stiftung Preußische Schlösser und Gärten gegen die Fotoagentur Ostkreuz durchgesetzt. Das Landgericht Potsdam verurteilte die Fotoagentur wegen Eigentumsverletzung als Mitstörer.
Diskussion über Urheberrecht und Web 2.0
Authors: Kreutzer Till
Published: December 2023

Am morgigen Dienstag findet bei der Körber-Stiftung in Hamburg eine Diskussionsveranstaltung zum Thema Urheberrecht und neue Medien statt. Mit iRights-Redakteur Till Kreutzer diskutieren Stefan Heidenreich, Autor und Kulturwissenschaftler, Sudabeh Mohafez, Schriftstellerin und Bloggerin und Verena Sich, Juristin beim Börsenverein des Deutschen Buchhandels. Moderator ist Christoph Bungartz vom NDR.
Freigeist oder vogelfrei?
Authors: Spielkamp Matthias
Published: December 2023

Die Honorare „grenzen an Körperverletzung“, die Aufträge bleiben aus. Können freie Journalisten nur mithilfe von PR überleben? Es hat den Anschein, sagt Tom Schimmeck, aber gerade deshalb dürfen Freie nicht nur klagen, sondern müssen für bessere Bedingungen kämpfen. iRights.info dokumentiert seine Rede zur Gründung des Verbands „Freischreiber“.  Tom Schimmeck (l.) beim Freischreiber-Gründungskongress, Berlin, November 2008. 
Frankfurt-live.com: Panoramafreiheit muss erhalten bleiben
Authors: Gehring Robert A.
Published: December 2023

Laut Frankfurt-live.com hat sich die Medienpolitische Kommission Hessen, ein “Fachgremium der hessischen Wirtschaft”, gegen die von der Enquete-Kommission “Kultur in Deutschland” empfohlene Einschränkung der urheberrechtlichen Panoramafreiheit ausgesprochen.
EU-Parlament verabschiedet Resolution zu ACTA-Verhandlungen
Authors: Gehring Robert A.
Published: December 2023

Vom 15. bis zum 17. Dezember wurden in Paris die Verhandlungen zum geplanten internationalen Anti-Piraterie-Abkommen ACTA fortgesetzt. Das EU-Parlament beklagt die fortgesetzte Geheimniskrämerei der Verhandlungspartner und fordert mehr Informationen.
Selbstvermarktung von Musikmachern
Authors: Gehring Robert A.
Published: December 2023

Die Website SellYourRights.com startet morgen einen interessanten Versuch. Der Pianist und Komponist Marcus Loeber will die Verwertungsrechte an seinem neuen Album “At the Very Moment” versteigern. Die Auktion läuft vom 12. bis zum 26. Dezember 2008. Weitere Informationen gibt es im Blog der Website. The post Selbstvermarktung von Musikmachern appeared first on iRights.info.
Wie geht’s weiter mit der Schutzdauerverlängerung für Musikaufnahmen?
Authors: Spielkamp Matthias
Published: December 2023

Martin Kretschmer berichtet von der komplexen Auseiandersetzung um die Schutzdauerverlängerung für Musikaufnahmen, die er ablehnt (mein Interview dazu hier). Besonders aufschlussreich: “Several MEP assistants told me that they had received offers for concert tickets of famous artists.” (“Einige Assistenten von MdEP haben mir erzählt, dass ihnen Karten für Konzerte berühmter Musiker angeboten wurden.”). Was es schwierig mache, die MdEP davon zu
Vortrag Florian Cramer: Anticopyright in künstlerischen Subkulturen (Sa 11.00 Uhr)
Authors: Kreutzer Till
Published: December 2023

Ein Überflug über die künstlerische Tradition, sich mit dem Urheberrecht kritisch auseinanderzusetzen, so könnte man den Vortrag von Florian Cramer mit einem Satz zusammenfassen. Konkret begann die Reise Mitte des 19. Jahrhunderts (einzelne Ausflüge gingen auch in die Antike) und führte uns bis in die Gegenwart.