bluuebunny/crossref_metadata_2025 huggingface dataset:
Revitalization Programs in Rural Areas in Kujawsko-Pomorskie Voivodship
Authors: Kola-Bezka Maria
Published: October 2022

The aim of the article is to evaluate revitalization programs of rural communes in Kujawsko-Pomorskie Voivodship and to formulate critical remarks with respect to the revitalization programming rules currently in force. The method of analyzing source documents (i.e., revitalization programs, was used to achieve this objective). The subject of the analyzes were: revitalization models, ways of designating degraded areas and areas of revitalization as well as financial instruments and forms and methods of social participation provided for in the revitalization process. The results of the study indicate that the principles of revitalization programming, which may be effective in cities, do not always correspond to the conditions prevailing in rural areas, which is mainly due to the fact that these areas are usually mostly affected by a crisis caused by widespread occurrence of structural problems.
From the Garden-City to the Idea of Sustainable Development: a Case Study of the Garden Tri-City Near Warsaw
Authors: Szczepańska Magdalena
Published: October 2022

The conception of a garden-city assumes creation of an organized unit in functional and spatial terms ensuring harmonious relations among economic growth, protection of the natural environment and catering to different kinds of social needs. Thus, this former city model is deeply rooted in the contemporary idea of sustainable development. The article aims to describe a research procedure that would allow a determination of the degree of implementation of the garden-city concept in relation to contemporary cities. Moreover, the paper presents a comparative analysis of selected garden-cities in the context of the sustainable development idea. Historical, social, environmental and economic factors were analyzed as well as the functional-spatial structure and strategic documents of the cities. The entities investigated were shown to be the Polish interpretation of the garden-city idea and local rules include requirements concerning the principles of sustainable development.
Ratio Analysis of Infrastructure Investments: a Case Study of the Municipalities and Communes of the Olsztyn County
Authors: Kozłowski Waldemar
Published: October 2022

A fundamental aspect of infrastructure investments made by local authorities is the evaluation of their effectiveness. Considering their public character, infrastructural investments require more methodological sophistication to allow an assessment of a number of areas which have been ignored in previous analyses. This paper introduces a model for evaluating infrastructural investments based on select socio-economic ratios. The results of the research can be used by local authorities during investment planning and evaluation.
Identification of Conditions of the Spatial Economy in Cross-Border Regions
Authors: Miszczuk Andrzej
Published: October 2022

The objective of the article is the analysis of conditions of conducting coherent spatial management specific to cross-border regions. The most important are geopolitical conditions, determining the character and functions of the national border. Socio-economic and spatial processes occurring in the conditions of both closed and open borders are also of importance. The institutional-legal distance occurring between entities located on both sides of the border may prove to be a serious hindrance in the conducting of coherent spatial policy in cross-border regions.
Ordering Illegal Migration Terminology: the Migration Legality Cube
Authors: Janicki Wojciech
Published: October 2022

In the subject literature, the terms “illegal migration” and “illegal migrant” encompass many categories of processes, people, and phenomena that have little to do with migration as a movement of people in space. This includes, most prominently, unauthorized employment and unauthorized residence in the receiving country. Both of these circumstances may be related to prior illegal migration, but do not necessarily have to be. The physical process of migration may have taken place entirely in accordance with the law. This is the starting point for the reconsideration of the standard migration terminology, as proposed in this paper. As three basic dimensions of illegality associated to date with migration analysis may focus on one person in as many as eight different combinations, this would require us to describe a single person using three different terms, which would quickly turn out to be inefficient. For practical reasons, the most convenient term is illegal migrant. Given its vague nature, however, the paper proposes to supplement this using the classification presented in the Migration Legality Cube encompassing eight types, depending on which group of migrants is in focus. This will make it easier for analysts and laymen alike to find their way in the ocean of uncertainty in which current debates on migration drift — and often founder.
Managing Cross-Border Movement of People and Goods in the European Union on the Example of the Road Border Crossing in Lubelskie Voivodship
Authors: Witkowski Piotr
Published: October 2022

The external border of the European Union is the subject of integrated management aimed at minimizing the risks associated with the illegal movement of people and goods. A significant section of the EU external border is located in the Lubelskie Voivodship. Its length and size of cross-border movement of people and trading goods and the diversification of border infrastructure is significant. The aim of the article is to discuss issues related to the integrated management of EU external borders and to present and analyse border service systems at road border crossing points, divided into a terminal system (Koroszczyn–Kukuryki ) and a so-called “pipe system” (Dorohusk ).
Application of Marketing Communication Tools in Small and Medium Enterprises. Results of Regional Research
Authors: Adamska Małgorzata
Published: October 2022

This paper aims to investigate the application of different types of communications forms and tools in the context of client capital management and development of the client lifetime value in the sector of small and medium enterprises. The research method was a questionnaire survey using computer-aided telephone interviews (CATI), on a group of 383 small and medium-sized enterprises from the Opolskie Voivodship. This research illustrates the use of diverse forms and tools by diverse members of the SME sector. More importantly, this research prepares conclusions for future development of communication as a main stimulator of increasing client lifetime value. The findings show that the small and medium enterprises in Opolskie Voivodship are aware of the need to use a variety of tools to communicate with clients. The tools are diverse and have a different degree of contact intensity, which effectively contributes to the involvement of clients in the relationship with the company’s offer. In the future the SME sector should develop and diversify channels of communication with client capital. For modern enterprises, the most important thing will be constant development of the client’s lifetime value.
Sandomierskie Voivodship in the Former Poland — Political and Administrative Status
Authors: Seroka Krzysztof
Published: October 2022

The Sandomierskie Voivodship existed on the administrative map of Poland from the 14th century until the fall of the Polish-Lithuanian Commonwealth at the end of the 18th century. Its genesis is connected with the times of the early Piast monarchy and the importance of the city of Sandomierz as one of the main seats of the Kingdom of Poland (sedes Regni principales) already defined in the oldest Polish Chronicles by Gallus Anonymus. Sandomierz’s relations with Krakow during the division of the state into districts (1138–1310) and support granted to the Piasts in the struggle for the unification of the state raised the province of Sandomierz to the rank of the voivodship, with all the constituent elements of the voivodship as an administrative unit of the nobility’s self-government. This study draws attention to the role of historical factors in obtaining a high position in the hierarchy of pre-partition Poland by the Sandomierskie Voivodship. In particular, the role of this voivodship is visible in the light of formal and legal sources, documents and royal seals as well as the place of the Sandomierz’s dignitaries in the former state ceremonial. The dusk of the significance of the Sandomierskie Voivodship was triggered by the reign of rulers of the Jagiellon dynasty in Poland. The shift of the state borders to the east after the unification of Poland and Lithuania weakened the former meaning of Sandomierz as the main gate leading from Poland to the east. After Poland regained its independence in 1918, the concept of the continuation of the voivodship with the capital in Sandomierz was developed. These plans were interrupted by the outbreak of World War II and the Polish state did not resume them.
Legal Status of the Voivodship Marshal in the Light of Its Functions
Authors: Sobczak Jacek
Published: October 2022

The legal status of the voivodship marshal is determined by a number of conditions. The most important are functions and powers vested in this authority under the Act on the voivodship government, other laws and provisions of secondary legislation. The analysis of these regulations determines the strong legal position of the voivodship marshal, which allow for including this authority in the category of local government bodies, even though the Constitution and the Act on the voivodship government mention only the voivodship assembly and the voivodship board as local government authorities. The independent, managerial powers in the voivodship board, and in particular the right to issue administrative decisions in individual cases, frame this institution as a monocratic authority. This conclusion allows putting forward a proposal concerning direct election of this authority by the inhabitants of the voivodship.
Komisja do spraw reprywatyzacji nieruchomości warszawskich jako nadzwyczajny organ nadzoru nad administracją samorządową
Authors: Kukuryk Krzysztof
Published: October 2022

Ustawą z 9 marca 2017 r. o szczególnych zasadach usuwania skutków prawnych decyzji reprywatyzacyjnych dotyczących nieruchomości warszawskich, wydanych z naruszeniem prawa utworzona została Komisja ds. reprywatyzacji nieruchomości warszawskich. Komisja powołana została do kontroli ogółu decyzji reprywatyzacyjnych dotyczących nieruchomości warszawskich, wydanych na podstawie dekretu z 26 października 1945 r. o własności i użytkowaniu gruntów na obszarze m.st. Warszawy. Kompetencje komisji stanowią istotny wyłom od ogólnej zasady postępowania administracyjnego zakładającej stabilność decyzji ostatecznych. Komisja ds. reprywatyzacji nieruchomości warszawskich jako organ administracji publicznej stojący na straży interesu publicznego w zakresie postępowań w przedmiocie wydania decyzji reprywatyzacyjnych dotyczących nieruchomości warszawskich jest organem nie tylko kontrolnym, ale i nadzorczym, posiadającym uprawnienia do władczego wkraczania w sferę samodzielności prawnej jednostek samorządu terytorialnego. Kontrola Komisji ds. reprywatyzacji nieruchomości warszawskich jest kontrolą szczególną. Z uwagi na sposób powoływania członków z jednej strony stanowi element kontroli parlamentarnej. Większość członków Komisji jest bowiem powoływana i odwoływana przez Sejm Rzeczypospolitej Polskiej. Z drugiej strony zakres kompetencji Komisji, zakres przedmiotowy nadzoru oraz tryb postępowania pozwalają na umieszczenie jej w systemie organów władzy wykonawczej.
Samodzielność finansowa samorządu terytorialnego. Uwagi na tle niektórych postulatów modyfikacji systemu dochodów samorządowych
Authors: Niezgoda Andrzej
Published: October 2022

Artykuł dotyczy problematyki podziału dochodów publicznych między administrację rządową i jednostki samorządu terytorialnego. Utworzenie jednostek samorządu terytorialnego jako podmiotów administracji publicznej wymaga zapewnienia im odpowiednich środków finansowych umożliwiających realizację zadań. Środki te samorząd otrzymuje w wyniku podziału dochodów publicznych między administrację rządową i jednostki samorządu. Jego efektem jest system dochodów samorządowych obejmujący dochody własne, subwencję ogólną i dotacje celowe z budżetu państwa, którego ramy prawne wyznacza Konstytucja i Europejska Karta Samorządu Lokalnego. Jednym z podstawowych czynników kształtujących rozwiązania prawne w tym zakresie jest pozycja ustrojowa jednostek samorządu, będących samodzielnymi, tj. niepodporządkowanymi hierarchicznie administracji rządowej, podmiotami wykonującymi zadania publiczne. Celem artykułu jest ocena propozycji zniesienia ograniczeń kompetencji samorządu w zakresie kształtowania stawek podatków lokalnych oraz zwiększenia poziomu finansowania samorządu z budżetu państwa. Analiza tych propozycji w świetle orzecznictwa Trybunału Konstytucyjnego prowadzi do wniosku, że obie wskazane wyżej propozycje nie mieszczą się w ramach prawnych wyznaczonych przepisami Konstytucji oraz Europejskiej Karty Samorządu Terytorialnego. Ponadto realizacja drugiej z nich wiązałaby się z ograniczeniem samodzielności samorządu, podważając jego pozycję ustrojową.
The Geographical, Economic and Legal Regionalization of the Changes in Dividend Payments in the World
Authors: Kowerski Mieczysław
Published: October 2022

The dynamic growth of nominal and real values of dividends paid in the world, observed since the last quarter of the twentieth century, is determined by the companies with the largest capitalization. However, the increase in global dividend payments is not the same in all countries and is subject to geographical, economic and legal regionalization. It is also disturbed by economic fluctuations (especially the 2008 crisis) and, more recently, by the COVID-19 pandemic. The paper, using the data from the survey of Janus Henderson Investments, analyses changes in dividend payments in geographical (continents) economic (countries with a similar level of economic development) and legal (countries with similar legal systems) regions by the 1,200 largest companies in the world between 2009 and 2021. Linnear trend models taking into account the COVID-19 pandemic in the world and in separate regions and subregions, as well as the panel partial adjustment model of dividends vs. GDP, were estimated. The conducted research confirmed the impact of different forms of regionalization on the rate of dividend payments by the world’s largest companies. In the years 2009–2021 dividend payments in Australia and Asia grew the fastest. COVID-19 significantly reduced dividend payments in 2020 in Europe. Dividend payments in emerging markets countries grew faster than in developed markets countries and COVID-19 did not significantly reduce payouts on emerging markets. However, it is the developed markets that still provide the vast majority of dividends. The common law system is more favorable to dividend payments.
DEVELOPING A SHADOWGRAPH EXPERIMENT SYSTEM FOR CHARACTERIZING SPRAY ATOMIZATION
Authors:   Le Quy Don Technical University, Phung Van Duoc
Published: October 2022

The development of modern imaging techniques plays an imporatnt role in studying fuel spray atomization. Shadowgraph combines camera, lens and lightsources to experimentally determine micro parametters (droplet size, droplet size distribution, velocity of droplets) and macro parametters (cone angle, breakup length, penetration) of spray structure. To achieve high quality, shadowgraph systems need to be carefully validated to ensure realiability and capability of working under various operating conditions. This articledevelops an experiment system for characterizing spray atomization by shadowgraph imaging technique. A peliminary study on an air-blast atomizer is also provided.
EFFECT OF FLEXIBILITY ON THE AERODYNAMIC CHARACTERISTICS OF AN INSECT-LIKE FLAPPING-WING IN HOVERING
Authors:   Le Quy Don Technical University, Le Vu Dan Thanh
Published: October 2022

Insect-mimicking flapping-wing micro air vehicles (FWMAVs) are currently of great research interest due to their many practical applications. Most of the studies have focused on the rigid wing, which is much simpler. However, the wings of these FWMAVs, as well as those of insects in nature, are light and flexible structures, thus the deformation is unavoidable. In this study, a spring-body system is used to model the insect-like wing structure, combined with an aerodynamic program based on the UVLM model. The co-simulation framework is validated with published experimental data. Results show that using the flexible wing significantly increases the lift force as well as improves energy efficiency.
STUDY ON CHARACTERISTIC PARAMETERS OF AN UPSTREAM TUBE-ANNULAR COMBUSTION CHAMBER OF THE MARINE GAS TURBINE ENGINEBY CFD SIMULATION
Authors:   Le Quy Don Technical University, Nguyen Quoc Quan
Published: October 2022

Thisarticle presents the numerical study of combustor aerodynamic parameters of marine gas turbine engines to evaluate the actual characteristics. With the 3D model built from the upstream tube-annular combustor of DR76 engine, using CFD approach to evaluate the flow structure, determine the total pressure drop, the airflow distribution into the linner in primary, secondary and dilution zones. As aresult, the cold pressure loss in the combustor was 5.5% of the inlet pressure, the air mass flow through the swirl zone by about 29%, the primary orifices and cooling channels by 40.5%, and the dilution zone by 30% of the total combustor airflow.
Ảnh hưởng của loại hom, mùa vụ và một số chất kích thích tạo rễ thương mại tới quá trình ra rễ của hom Hoắc hương
Authors: Phùng Thị Lan Hương , Nguyễn Phương Quý , Vũ Xuân Dương , Nguyễn Thị Thu Thảo
Published: October 2022

Cây Hoắc hương (Pogostemon cablin (Blanco) Benth.) là cây lấy tinh dầu quan trọng rất cần cho công nghiệp nước hoa cũng như có giá trị dược liệu. Nghiên cứu này có mục đích khảo sát ảnh hưởng của một số yếu tố như loại hom cành, mùa vụ và một số chất kích thích rễ thương mại đối với sự ra rễ của hom Hoắc hương. Kết quả nghiên cứu cho thấy sự ra rễ đạt hiệu quả cao nhất ở hom Hoắc hương non, trong cả hai mùa đông và mùa xuân, khi so sánh với ở cành bánh tẻ và cành già. Các chất kích rễ thương mại có hiệu ứng không giống nhau tới sự ra rễ (tỷ lệ ra rễ, số lượng rễ, chiều dài rễ) ở các loại hom khác nhau. Tỉ lệ ra rễ đạt 100% ở tất cả các công thức thí nghiệm có cành hom non. King root và Rooting power có hiệu ứng kích thích tạo số rễ và sinh trưởng chiều dài rễ lớn hon so với N3M và Rootone. Số lượng rễ/hom cao nhất thu được khi xử lí King root hoặc Rooting power trên cành non (27,2 và 28,8 rễ/hom) và cành bánh tẻ (27,0 và 25,6 rễ/hom). Trong khi đó, chiều dài rễ lớn nhất quan sát được khi xử lí King rooting trên cành non (50,8 mm). Nghiên cứu này gợi ý có thể sử dụng hom non để nhân giống cây Hoắc hương. Mùa vụ thích hợp là mùa xuân và có thể sử dụng các chất kích thích rễ thương mại King root và Rooting power trong nhân giống loài cây dược liệu này.
The degree to which faculty members in the Faculty of Education Saber at the University of Lahj practice their academic roles from the students’ point of view
Authors:   Assistant Professor|| Faculty of Education||Tur_Al_Bahah|| Lahj University || Yemen Tel: 00967772161364|| Email: dr-smeeerth73@gmail.com, Ahmed Taha Sameer
Published: October 2022

The study aimed at estimating the degree to which faculty members in the college of education saber Lahj university, Practice their academic roles from the students’ point of view. The study was applied to a random samples of (223) male and female students from all scientific department of the faculty of education- Saber university of Lahj . the results of the study showed that the faculty members ‘ practice of their academic roles got a total average of (3.36 out of 5) with a grade of (medium) and at the level of fieds, evaluation skills got the highest average (3.37) and finally, personal skills and moral qualities with an average (3.32) and all of them with a degree of practice (medium),as the results of the study showed that there were no statistically significant differences at level (0.05) between the average responses of the sample members in the areas of the study tool according to the variable of specialization (applied – theoretical) and in light of the results, the researcher recommended designing training programs to develop roles the ethical, personal, professional and academic skills and evaluation skills of the faculty member, and adoption of the roles addressed by the study in evaluating the performance of the faculty member from the point of view of students and colleagues, in addition to proposals for studies completing the subject of the study. Key words: evaluation – academic roles – practice – teaching staff – university of Lahj - students’ point view. الملخص بالعربية: هدفت الدراسة إلى تقدير درجة ممارسة أعضاء هيئة التدريس بكلية التربية صبر جامعة لحج لأدوارهم الأكاديمية من وجهة نظر الطلاب، ولتحقيق أهداف الدراسة أعد الباحثان استبانة تضمنت (50) عبارة موزعة على ثلاثة مجالات؛ تم تطبيق الدراسة على عينة عشوائية مكونة من ( (223طالباً وطالبة من كافة الأقسام العلمية بكلية التربية صبر بجامعة لحج. وأظهرت نتائج الدراسة أن ممارسة أعضاء هيئة التدريس أدوارهم الأكاديمية حصلت على متوسط كلي (3.36 من5) بتقدير (متوسطة) وعلى مستوى المجالات؛ حصلت مهارات التقييم على أعلى متوسط (3.38) ثم المهارات المهنية والأكاديمية بمتوسط (3.37) وأخيراً المهارات الشخصية والصفات الأخلاقية بمتوسط (3.32) وجميعها بدرجة ممارسة (متوسطة) كما بينت نتائج الدراسة عدم وجود فروق دالة إحصائياً عند مستوى (α≤0.05) بين متوسطات استجابات أفراد العينة في مجالات أداة الدراسة وفقا لمتغير التخصص (تطبيقي- نظري)، وفي ضوء النتائج أوصى الباحثان بتصميم برامج تدريبية لتنمية الأدوار الأخلاقية والمهارات الشخصية والمهنية والأكاديمية ومهارات التقييم لدى عضو هيئة التدريس، واعتماد الأدوار التي تناولتها الدراسة في تقييم أداء عضو هيئة التدريس من وجهة نظر الطلاب والزملاء، إضافة لمقترحات بدراسات مكملة لموضوع الدراسة. الكلمات المفتاحية: تقييم. ممارسة. الدور الأكاديمي. هيئة التدريس. جامعة لحج.، وجهة نظر الطلاب
An upper bound for the regularity of edge ideals
Authors:   Vinh University, Nghe An, Viet Nam, Thi Thanh Ha DAO
Published: October 2022

Let G be a simple graph. We give an upper bound for reg I(G) in terms of the induced matching number of its spanning trees.
Teaching the Theorem 3 of the Continuous Function sourced in Algebraic and Analysis textbook of current grade 11 aims to train Maths-talented students in high school
Authors:   Vinh University, Nghe An, Viet Nam, Tran Lam NGUYEN
Published: October 2022

Textbooks play an important part in teaching and developing students’ learning orientation. Basing on the study of the Theorem 3 cited in Algebraic and Analysis Textbook of current grade 11, our goal is to focus on the importance of teaching implementation in order to faclitate students to comprehend knowledge mentioned in textbooks and to apply such basic knowledge into doing related exercises or topics. By that means, it is expected to improve students not only mathematics understanding but also general intellectual development.
“Off-standard” words and the creation of neologism in To Hoai's memoirs
Authors:   Nghe An College of Arts and Culture, Thi Dao NGUYEN
Published: October 2022

Studying To Hoai's memoir, we can not only see that the author was a writer with an abundant and profound language knowledge, flexible and talented use of national language to describe, tell, and look back what he has experienced, but also discover his creativity and rule-break in word formation when producing his writing works. A number of words were created by combining, separating, or forming different words or meanings by himself to express the content of the events he wanted to manifest in the most effective way. This confirms not only his personal experience and his rich language knowledge but also his great contribution to the development of the Vietnamese language in the 20th century.
Foreign trade activities, investments and economic cooperation with external partners of Cambodia from 1993 to 2013
Authors:   Hue Academy of Administration, Hai Dinh TRAN
Published: October 2022

This study helps to clarify key governmental policies, analyzes the developmental manifestations of foreign trade, investment and economic cooperation in Cambodia from 1993 to 2013, with two phases (1993 - 2002) and (2003 - 2013). Although the size, level and structure of these sectors were different in each stage of development, but trade in Cambodia from 1993 to 2013 continued to grow by increasing exportation; attraction and and approach of investment were openly regulated; economic cooperation developed by maintaining and developing traditional cooperation, and expanding global partnerships, which was strongly influenced by China.
Determining characteristics of the M'nong epics in terms of social basis and reflected contents
Authors:   Tay Nguyen University, Van Thinh TRIEU
Published: October 2022

Through the survey, we find that the social base of the M'nong Epics (Ot Ndrong) was in the early history of human history, the time when people were on their way to come before “the threshold of the era of civilization”. The main content of the M'nong Epics was the wars that unified small and sporadic villages into larger alliances. In Ot Ndrong, the spirits had a very important role; There, spirit and human activity intertwined as in a universe that was still in chaos. Besides, polygamy, custom of totem worship, the taboo and the ancient rituals appeared very regularly. From the research results, we have more evidence to confirm that the M'nong Epic is a mythical epic.
Human sensibility in Vietnamese contemporary travel sketch
Authors:   Vinh University, Nghe An, Viet Nam, Tri Dung DINH , Thi Xuan Quynh NGUYEN ,   Vinh University, Nghe An, Viet Nam
Published: October 2022

Travel sketch has been especially flourished in the recent years as a typical literary genre. Human sensibility as a result of integration trend becomes one of the unique and inspirable points in these travel works. Based on the survey of contemporary Vietnamese travel sketch (from 2000 up to now), this paper initially identifies the original literary world which was built up by human sensibility. That reveals in some specific expressions: the aspiration of travelling, the effort to integrate and conquer cultural challenges and sense of “go and come back”. All of these together are fueled by a mix of proper style of language, open structural forms and natural narrative that makes contemporary travel sketch more popular and charismatic to readers.
The anatomy of the Domestic pigeon Columba livia domestica gmelin, 1789 and the Chicken Gallus gallus domesticus (linnaeus, 1758
Authors:   Department of Biology, Faculty of Education, Can Tho University, Minh Quang DINH , Vo An Khang LUONG ,   Department of Biology, Faculty of Education, Can Tho University, Vu Dieu Anh MAI ,   Department of Biology, Faculty of Education, Can Tho University
Published: October 2022

In this paper, we provides the anatomical figures of male and female Domestic pigeon Columba livia domestica and Chicken Gallus gallus domesticus. The figures are drawn based on 12 specimens of these two species by Adobe Illustrator CS6 software. Specimens are euthanized by ether and taken photos that are then drawing with legends in Vietnamese and English, which are different from images in the previous documents. The anatomical figures play as visual document being used in teaching for pupils and students.
Study of enhancement of self-Kerr nonlinearity in three-level cascade EIT medium with doppler broadening
Authors:   Vinh University, Nghe An, Viet Nam, Ngoc Sau VU , Tue PHAM ,   Hong Linh High School, Ha Tinh
Published: October 2022

We study enhancement of self-Kerr nonlinearity in three-level cascade EIT medium by the analytical method. The results apply to the 85Rb atoms and show that, in the presence of the EIT effect, the Kerr nonlinear coefficient is enhanced several order of magnitudes (about 10-5 cm2/W) around transparent region. That is, on the Kerr nonlinear graph the two positive and negative values are found on both sides of the resonant frequency. The amplitude and sign of the Kerr nonlinear coefficient can be controlled versus the intensity or frequency of the coupling laser field. Influence of Doppler broadening leads to a decrease in the amplitude of the Kerr nonlinear coefficient. Analytical results are useful for experimental observation and related applications.
On the (p; q)-type strong law of large number for double arrays of random elements
Authors:   Department of Mathematics, Hoa Lu University, Ninh Binh, Thi Ngoc Anh VU
Published: October 2022

In this note, we provide the necessary and sufficient conditions for double arrays of random elements satisfying the (p; q)-type SLLN for the case 1 ≤ q < p < 2:
Design and Verification of a Creeping Mars Rover
Authors: Zhang Wangjun , Jia Yang , Tao Zhuo
Published: October 2022

Aiming at the possible wheel sinkage, difficulty in climbing and underpinning of Mars rover with traditional passive suspension due to the complex terrain of Mars surface, the characteristics of the inchworm motion are imitated, and a creeping Mars rover is designed, include the design of sinkage and extrication, slope-climbing, anti-underpinning, and wheel-lifting. The key parameters of the mobile system of creeping rover are identified and the key parameter values of different rover lift heights and the displacement value of a creeping cycle are calculated. and the results show that the creeping rover can solve the above problems encountered by the passive suspension rover. Ground tests and flight tests have been carried out on the designed creeping rover, and the ground tests have verified the ability of wheel sinkage and extrication, obstacle-overcoming, and slope-climbing. As an example of the application of the creeping rover, the “Zhurong” Mars rover has undergone flight tests, and its successful operation on the surface of Mars shows that the design measures of the creeping are effective.
Investigation of the Shear Stress Dynamics on Silty Loam Soil and Measurement of Traction-Wheel Slip Relationship of a Tractor Tire
Authors: Arévalo César , Böttinger Stefan
Published: October 2022

The Hohenheim Tire Model (HTM) was developed and validated at the University of Hohenheim. It simulates the specific behavior of large-volume agricultural tires and is used in conjunction with multi-body models of tractors and other agricultural machines. Special focus is placed on driving dynamics and comfort. Currently the HTM is being expanded for implementation on soft soils. Therefor the soil's shear response using Bevameter tests and the relationship traction-wheel slip using a single wheel tester are investigated. In field tests, the effect of shear rate on soil mechanical parameters was examined. The shear device of the Bevameter was used to conduct experiments in a soil bin with silty loam at eight shear rates and five vertical loads. The Mohr-Coulomb failure criterion was calculated and the measured values were fitted to the Wong-Preston and the Janosi-Hanamoto approaches. The shear stress-shear displacement curves show two different behaviors with respect to shear rate. At high shear rates, the shear stress reaches a peak and then drops to a residual value, which is typical for cohesive soils. At low shear rates, the trend of the curves is exponential, which is typical for granular soils. The cohesion and angle of internal friction values are comparable to those from literature. The angle of internal friction has no correlation with shear rate while the cohesion shows a low correlation. Traction-wheel slip curves for the tractor tire 480/70 R24 with two tire loads (17 and 22 kN) and at 2 km∙h-1 were measured under identical conditions as the shear experiments. For the higher tire load, there is a tendency toward a larger tractive force. The curves of both wheel loads have equal gross traction coefficients. For the prediction of the traction force, the parameters obtained in the shear tests and the method of Wong and Preston-Thomas are used.
A Wheel and Vehicle Mobility Index Based on Traction and Velocity for Optimization of Mobility Performance
Authors: Vantsevich Vladimir , Gorsich David , Gorsich David , Ghasemi Masood , Moradi Lee
Published: October 2022

In this paper, two new indices for wheel and vehicle mobility performance suitable for mobility performance optimization are proposed based on the wheel circumferential forces and the vehicle actual linear velocity. The indices are intended for on-the go assessment of mobility for autonomous real-time optimization of wheel power distribution. The wheel mobility performance (WMP) characterizes the mobility performance of a wheel in terms of its traction and velocity with regard to a potential but unachievable maximum. The index is extended to a vehicle with a given number of drive wheels, where the traction characteristics and theoretical velocities may be different at each wheel, as the vehicle mobility performance (VMP). The VMP index is demonstrated through a simulated comparison of multiple driveline configurations of a 4x4 vehicle on different terrains to the optimal value. The optimal mobility is computed through an objective function with the use of Lagrange Multipliers which determine the optimal distribution of vehicle forces and slippages which achieve optimal mobility.
Campo electromagnético amplificado con nanoestructuras de geometría estelar
Authors: Cruz García Iván Alberto , de León-Zapata Ramón Díaz , De la Rosa Zapata Ariel Benjamín , Flores-García Efrén , González Fernández José Vulfrano , Javier González Francisco
Published: October 2022

Se presenta el estudio de nanoantenas de geometría estelar como elementos plasmónicos amplificadores y direccionales del campo electromagnético. El estudio se llevó a cabo con análisis numérico basado en la técnica del elemento finito. Fueron analizados varios materiales, dimensiones arreglos geométricos y frecuencias para la simulación y el análisis de datos. La geometría estelar fue elegida con base en la propiedad de autoensamblado de los materiales de plata-óxido de zinc (Ag-ZnO). La direccionalidad y la amplificación del campo eléctrico fueron simulados tanto en campo cercano como en campo lejano. Adicionalmente se discuten algunas aplicaciones de estas nanoestructuras.
Indicadores de resiliencia como predictores de desempeño en equipos deportivos de alto rendimiento
Authors: Segura Mojica Francisco Javier
Published: October 2022

En esta investigación se explora la manera en que la resiliencia en equipos deportivos de alto desempeño puede relacionarse con el logro de objetivos a mediano plazo. Se integró una base de datos con indicadores de resiliencia observables en el desempeño de equipos de futbol profesional en México y se analizaron los datos mediante un modelo de regresión logística logit. Entre los indicadores de resiliencia con mayor valor predictivo para determinar las probabilidades de que un equipo logre un campeonato, se encuentran la capacidad de revertir un marcador adverso y la capacidad de anotar goles en el lapso final de los partidos.
Dispositivo recortador de luz láser de bajo costo controlado por LabVIEW
Authors: Blanco-Tapia L.E. , Benítez-Aguilera A.I. , De la Rosa-Zapata Ariel Benjamín , Ortega-Gallegos Jorge , González Fernández José Vulfrano
Published: October 2022

En este trabajo se reporta la fabricación de un dispositivo recortador de onda basado en LabVIEW. El dispositivo consiste en usar pulsos ópticos infrarrojos para controlar la velocidad de una hélice con un motor de corriente continua operado a 6 V. Con un punto de prueba estimado de 1000 rpm, se hace girar una hélice con 12 aperturas para controlar una frecuencia de giro exacta por medio de un sistema retroalimentado en configuración control PID, de esta manera obtenemos pulsos que tienen forma y frecuencia particular controlada. Por medio de la tarjeta de bajo costo NIDAQ-USB6002, en LabVIEW se utilizan las herramientas de programación para detectar la frecuencia del giro, realizar el análisis y procesamiento para variar el voltaje de salida de tarjeta que alimenta al motor y controlar la velocidad de rotación. La funcionalidad del sistema fue corroborada al utilizar el
dispositivo para realizar una caracterización espectroscópica por fotorreflectancia.
Evaluación de la Huella de Carbono de las Microempresas en la Zona Metropolitana de San Luis Potosí
Authors: Gómez Vega Jesús Jovani , Flores Gutiérrez Metzly Desiree , Castillo Carrillo Elsa
Published: October 2022

En este artículo se presenta una estimación del consumo eléctrico de las microempresas establecidas en la Zona Metroplitana de San Luis Potosí-Soledad de Graciano Sánchez; la evaluación de su Huella de Carbono y Daños a la Salud Humana utilizando el modelo EcoInvent 2.2 Database with ReCiPe Assessment Method Hierarchist with World Normalization; y los beneficios que generaría el uso de electricidad producida a partir de energia fotovoltáica. Se encontró que el consumo de electricidad en las microempresas establecidas en la ZM-SLP-SGC oscila entre 199.34 y 278.79 millones de kw/h; las emisiones de CO2 de las microempresas en la ZM-SLP-SGS oscilan entre 146 778 y 205 283 toneladas por año; y la sustitución de energía electrica convencional por páneles fotovoltáicos representaría una reducción de 92.4% en emisiones de CO2 y 90% en Disability Adjusted Life Year (DALY).
Procesos de calidad en exportación de aguacate de Uruapan Michoacán a Estados Unidos
Authors: Suárez-Espinosa Brenda Crysta , Aguirre-Escalera Rodolfo , Chávez-Esquivel Gilberto , Arévalo-Carrasco Francisco Jesús
Published: October 2022

La presente investigación tiene la finalidad determinar el nivel de implementación de procesos enfocados a la calidad en las empresas que exportan aguacate a Estados Unidos ubicadas en la localidad de Uruapan, Michoacán, México. Los datos fueron obtenidos durante el año 2020 mediante la aplicación de un cuestionario diagnóstico en una muestra por conveniencia proporcionada por la Asociación de Productores Empacadores de Aguacate dela entidad y basado en la perspectiva procesos internos, donde se incluye la calidad de Kaplan y Norton (2002) y la Norma ISO 9001:2015, se realizó también un análisis de literatura sobre los principales esquemas para la exportación de fruto permitiendo también la obtención de las conclusiones de la investigación mediante el método inductivo. Los resultados refieren que las empresas bajo estudio mantienen un nivel alto de estandarización de procesos enfocados a la calidad, sin embargo, presentan áreas de oportunidad al identificarse que los principales retos del sector son la innovación, implementación de técnicas ingenieriles para el control del proceso, así como planeación a largo plazo.
The explorat ion of inflammat ory and coagulation biomarkers between pregnantwomen with andwithout COVID-19
Authors: Wardhana M.P. , Tumangger D , Juwono H.J. , Ernawati E. , Rifdah. S.N. , Wafa I.A. , Kuntaman K. , Dachlan E.G.
Published: October 2022

Objectives: to assess the effect-related inflammatory and coagulation biomarkers in pregnancy and their connection with the coronavirus disease of 2019 (COVID-19). Methods: A prospective case-control study was carried out among normal third-trimester pregnant women admitted to the labor room of Dr. Soetomo General Academic Hospital between January until June 2021. Two classified groups of patients were established in accordance with the result of the RT-PCR test. Demographic, clinical and laboratory results data of the two groups were collected and compared. Results: Platelet-to-lymphocyte ratio (PLR) was shown to be the only significant biomarkers found in the expectant with COVID-19, which was 35.8% higher compared to the ones free of COVID-19 [212.25 (157.57-269.37) vs 156.29 (128.55-195.3), p=0.048]. Logistic regression analysis of PLR between groups showed that the level of PLR was an independent factor in pregnant women with COVID-19 (OR 4.483, 95%CI 1.262-15.926). The ROC analysis showed that the PLR cut-off among the expectant was 171.335, with both sensitivity and specificity were 66.7% (p=0.021). The result shows no significant differences in leukocyte count, absolute neutrophils – lymphocyte count and percentage, neutrophil-to-lymphocyte ratio (NLR) and D-Dimer level between pregnant women infected with COVID-19 and free of the virus (p>0.05). Conclusion: Intriguingly, physiological adaptation during the course of the third trimester of pregnancy found no difference in most inflammation and coagulation markers, both in the condition of infected COVID-19 or not. The evidence from this single-centre study supports the viewpoint that elevated PLR was associated with independent biomarkers and thereby might be helpful to detect expectant with COVID-19.
Experimental Investigations of Composite Halite Core with a Hard Rock Creep Behavior
Authors: Ju Yingtong , Chen Mian , Lu Yunhu
Published: October 2022

Rock salt, mainly comprised of NaCl, exhibits inherent softness and has a good rheology property, resulting in complex creep patterns and fracture evolution for wellbore stability. They are, even coming from underground, facing weathering and dissolution & precipitation process, which makes the rock salt outcrop structure probably different from halite core. In this paper, physical property and chemical composition comparisons were conducted first to determine the difference between conventional rock salt outcrop and the halite core. The creep behavior of rock salt, shale, and halite core was investigated respectively by creep tests and DIC analysis. The results show that shale creeps are accompanied by fluctuation and the sample is compressive in both axial and radial. The fine grain rock salt has a smooth strain & time relation and the sample has a negative (tensile) volumetric strain as well as radial strain. However, the composite halite core creeps in a pattern between "soft rock" (rock salt) and "hard rock" (shale). Creeping with fluctuation, the sample dilates in radial while the volume is compressive. DIC analysis shows that the high strain area is concentrated at the boundary between different components.

1. INTRODUCTION

Halite or rock salt formation is considered to be an ideal location for gas storage due to its perfect tightness, and the pre-salt area has shown great exploration potential and prospects nowadays (Formigli, J. M. et al. (2009); de Almeida, A. S.et al. (2010); Jones*, C. M. et al. (2015); França, D. et al. (2021)). Since the salt has a rheological property, it leaves tremendous challenges to drilling safety, as well as wellbore integrity. Therefore, there is of great necessity and meaning to investigate the creep behavior of rock salt.

In Tarim basin, northwest of China, the salt composition is not as simple as that in, for example, the Brazilian coastal region. Since the salt formation is bedded, mud, quartz, and other impurities may exist between salt layers. Therefore, the creep behavior of this type of rock salt remains uncertain.
Geomechanical Controls on Production Performance of Austin Chalk and Eagle Ford Oil Wells in Southern Texas
Authors: Panja Palash , Sorkhabi Rasoul
Published: October 2022

Austin Chalk and Eagle Ford formations, both Upper Cretaceous in age and located in southern Texas, are two prominent tight oil plays in the US shale revolution. Our analysis of production data from horizontal wells from these two plays indicates that the deeper horizons exhibit better production performance. For the Austin Chalk, the shallow wells (4000-8000 ft deep) yield normalized cumulative production (NCP) of 0.44 STB/ft/month which increases to 0.75 STB/ft/month for the deeper wells (8000-14000 ft). For the Eagle Ford, the NCP is 0.42 STB/ft/month for shallow wells (4000-10000 ft) which increases to 0.71 STB for deeper wells. Similarly, the first month’s gas to oil ratio (GOR) almost doubles for the deeper wells in both formations. This geomechanical control may be explained on account of greater thermal maturity and fluid pressures at the deeper levels of these plays. Well production from depths <6000 ft probably indicates upward migration of oil from the deeper levels in both formations, while wells deeper than 10000 ft show higher GOR values because of more thermal maturity and proximity to the gas window.

1. INTRODUCTION

The US shale revolution has doubled the country’s crude production since 2010. Tight oil currently accounts for over 60% of US crude production (Figure 1; EIA 2022). The Upper Cretaceous Austin Chalk and Eagle Ford formations distributed extensively in the subsurface stratigraphy of southern Texas and Louisiana (Figure 2) are among the ten major plays that have contributed to the US shale revolution. The Austin Chalk and the Eagle Ford respectively produced 0.11 and 0.96 million barrels of oil per day (MMBOPD) in December 2021; together, they accounted for about 9% of the total US crude production (11.6 MMBOPD; EIA, 2022).

Although the stratigraphy and source rock evaluation of these and other tight oil formations in the US have long been studied, their properties as reservoirs have been relatively less investigated quantitatively. Obviously, our knowledge of these tight oil formation as reservoirs have significant relevance to their optimal production and recovery. One approach to decipher the reservoir behavior of tight oil formations is the "reverse engineering of production data to petroleum systems" (Sorkhabi and Panja, 2020, 2021). In this paper, we apply this approach to the Austin Chalk and Eagle Ford formations, and highlight the geomechanical controls on the production performance of these plays.
Improved Relationships of Moment Magnitude with Regional and Local Magnitudes for Earthquakes in the United States
Authors: Kc B. , Amirlatifi A. , Ghazanfari E.
Published: October 2022

The moment magnitude is the preferred magnitude to characterize the earthquake source. Moment magnitudes (Mw) are calculated from moment tensor inversion. In contrast, the regional short period surface-wave magnitude (Mblg) and local magnitude (ML) are calculated using the amplitude of the Lg surface waves and maximum horizontal amplitude measured by the seismograph, respectively. Moment magnitudes are inaccurate for small earthquakes (Magnitude < 3.5) and if the waveforms used in the moment tensor inversion are recorded in stations with inadequate azimuthal coverage for the earthquake. In such cases, the moment magnitude is estimated using other available magnitudes. Due to the difference in bedrock geology and anelastic attenuation coefficient, the National Earthquake Information Center (NEIC) uses different magnitudes for the Central Eastern (i.e., Mblg) and the Western (i.e., ML) United States. This study uses the Saint Louis University earthquake catalog to develop improved relationships of moment magnitude with the regional magnitude (Mblg) in the Central Eastern U.S., and the local magnitude (ML) for the Western U.S. to accurately estimate moment magnitude when the moment tensor inversion is unavailable.

1. INTRODUCTION

Earthquake magnitude is a commonly accepted tool to quantitatively describe the size and severity of an earthquake. During an earthquake event, seismic energy at the hypocenter is radiated through the earth in different waveforms, i.e., body waves (P and S waves) and surface waves (Rayleigh and Love waves), which are recorded by the seismometers on the earth’s surface. In 1935, Charles F. Richter introduced the concept of measuring the earthquake magnitude based on the maximum amplitude of the waveform recorded in a particular type of seismograph (Woods - Anderson torsion instrument) in southern California (Richter (1935)). Richter magnitude (ML) developed by Richter (1935) was only valid for southern California for specific frequency and distance ranges. Thus, several magnitude scales were developed based on the amplitude of the specific type of seismic waves within specified frequency ranges to account for the regional anelastic attenuation of the waveforms and measure the earthquakes in regions other than southern California (e.g., USGS (2022a)).