bluuebunny/crossref_metadata_2025 huggingface dataset:
Generalized Momentum implied by GUP with a Nonrelativistic Harmonic Oscillator
Authors: Khorram-Hosseini Seyed Amin , Zarrinkamar Saber , Panahi Hossein
Published: March 2023

We consider the Schrödinger equation with a generalized form of uncertainty principle and solve the problem up to a third-order correction to the arising equation. The particle in box and harmonic oscillator cases are considered in this formulation and various thermodynamic properties are reported including entropy, internal energy, chemical potential, specific heat, etc. Various consequences of the GUP are commented.
Establishment and validation of prognostic model of lung adenocarcinoma based on apoptosis-related genes
Authors: Zhang Wei , Zhu Wentao , Xu Suwei , Liu Yu
Published: March 2023

Objective: Apoptosis is an autonomous cell death process controlled by genes that can keep the internal environment of cells relatively stable. Lately, many studies have shown that apoptosis plays an important role in the construction of tumor microenvironment, mainly through the release of a series of regulatory factors to control cell growth. Therefore, it is very valuable to find and explore the possible role of apoptosis in the pathogenesis of lung cancer and its impact on the prognosis of patients.
Materials and Methods: We selected 10 apoptosis-related genes and used different statistical methods to construct a model to predict the survival and prognosis of patients with lung adenocarcinoma. Univariate and multivariate Cox analysis were used to evaluate the predictive power and value of prognostic models, as well as receiver operating characteristic (ROC) curve analysis.
Results: We defined two subgroups (cluster1 and cluster2). Compared with cluster1, cluster2 was named "apoptosis inhibition subgroup". The survival prognosis of cluster1 was significantly better than that of cluster2, and the infiltration of immune cells in cluster2 suggested that its immune system was inhibited. Then, we established a new prognostic model of apoptosis-related genes to identify high-risk patients with lung adenocarcinoma. Two types of Cox proportional hazards analysis and ROC curve showed that our model can be used as a new independent factor for the prognosis of lung adenocarcinoma patients, and had strong predictive ability.
Conclusion: Apoptosis is involved in the formation and development of lung adenocarcinoma and plays an important role. Our survival model can better predict the survival and prognosis of lung adenocarcinoma, and our study may be helpful for further research on new therapeutic targets and precise individualized treatment in the future.
Information modelling of road facilities
Authors:   Irkutsk National Research Technical University, Badmaeva Irina A. , Volkova Elena V. ,   Irkutsk National Research Technical University
Published: March 2023

This work addressed the problems of using information modelling in road facilities. One of the main scientific and technical tasks of implementing information modelling in the field of design and construc-tion of highways and engineering structures lies in its use throughout the entire life cycle of a road facility. It was revealed that such models should include the geometric characteristics of road facilities, local conditions in which they are located and basic data on the occurring processes. The applicability of information models at different stages of construction, reconstruction and reconditioning of roads and engineering structures were considered in order to ensure continuous monitoring of all technical programmes and data amendment. In order to implement the information modelling to design manage-ment, it is necessary to establish interaction between all the design participants by means of a special knowledge library represented by a catalog of standard solutions that can be used in subsequent pro-jects at variable component parameters. Software products used for the design of roads using infor-mation modelling were given. A 3D model of a motorway bridge containing the data on each element was presented, which allowed a spatial model of an engineering structure to be built. It was concluded that the use of information modelling of an object greatly facilitates the work of designers and con-struction workers, allowing for many advantages over previous means of developing road construction projects. This approach offers a combination and coordination of parts of the designed road object developed by different specialists and organisations.
Seasonal water balance of the Abay River Basin assessed using satellite databases and a specialized hydrological model
Authors:   Irkutsk National Research Technical University, Chupin Viktor R. , Yoshe Agegnehu K. ,   Irkutsk National Research Technical University,   Arba Minch University
Published: March 2023

The paper examines the seasonal water balance of the Abay River basin (Ethiopia) using open-access satellite data and a hydrological model representing the formation of water resources. The conducted analysis and theoretical studies indicate that hydrological modeling and remote sensing are the most appropriate tools for assessing water balance, which is essential for determining water prices and op-timizing water resource management. In this work, QGIS models were applied to estimate water deficit during the dry season and water surplus during the rainy season, using those data to determine sea-sonal water balance for six years. To this end, the study employed GeoTIFF metadata and additional information, including a map projection, coordinate systems, ellipsoids, and baseline data necessary to establish the accurate spatial reference of the file. The water balance analysis required data on evapo-ration, precipitation, surface runoff, and surface water reserves in the Abay River basin. According to the calculation results, a significant surplus of water was noted during the rainy season and its deficit during the dry season. The obtained numerical data were used to model the timing of droughts and floods, as well as to manage urban drainage systems and agricultural irrigation.
A novel method for experiments in a one-atmosphere box furnace
Authors: Linzerová Dominika , Špillar Václav , Fabbrizio Alessandro
Published: March 2023

We present a conceptually simple method to perform high-temperature experiments in a one-atmosphere box furnace that has a negligible cost of materials. The experimental setup consists of two commercially available materials and can be customized to sample or furnace size with few limitations. Furthermore, the design allows easy extraction of samples in one piece, making them eligible for textural analysis.

The setup comprises a graphite capsule and a fireclay shell, the latter of which acts as a heat-resistant protective shield. Containers must be individually hand-crafted, but each can hold multiple samples. The setup can be reliably used in temperature conditions below the heat tolerance limit of the commercial fireclay, commonly ~1400 °C. Moreover, the graphite capsule buffers the oxygen fugacity to strongly reducing conditions during the experiment. The main advantage of our method lies in the utilization of easily accessible and low-cost materials that provides a widely applicable experimental setup easily used at larger scales. The method was developed during an experimental study of magmatic crystal-liquid suspensions and was reliable for experiments lasting for up to 36 h.
An Indigenous Perspective on Women Leadership: An Example for Higher Education
Authors: Jacobs Don , Witt Judy
Published: March 2023

Fielding Graduate University, founded in 1974, offers distributed graduate education and research programsin three social science areas: psychology, human and organizational development, and educationalleadership. All three schools affirm a commitment to social change and social justice. The EducationalLeadership and Change (ELC) doctoral program was developed in 1996 as a way to influence educationalreform and to make doctoral education accessible to working adults, especially those from underservedcommunities. During its development, the program struggled and faltered as it tried to establish its identityand work toward its goals. After an abrupt change in leadership, two women emerged to form a co-deanleadership team: Susan Tiara, Ph.D. and Judy Witt, Ph.D. Looking for a model that emphasized relationshipsand a more global outlook, they adopted Total Transformational Management Process (Mink, Esterhuysen,Mink, & Owen, 1993) as the conceptual framework for ELC's governance. Based on action researchprocesses, TTMP utilizes an inclusive model for change that emphasizes the system, "paying specialattention to the human side" (p. 11). TTMP was instrumental in developing ELC's way of simultaneouslyworking at the individual, group, and organizational levels and in seeing participatory action research (Park,1992, 1993) as "transformation concomitant with intense learning" (Mink, et al., 1993, p. 11). Consideringthe complexity of Fielding's dispersed learning environment, such a transformational priority in leadership,communication, and decision-making became a critical priority for both Fielding and ELC
Theorizing African American Women's Leadership Experiences: Socio-Cultural Theoretical Alternatives
Authors: Byrd Dr. Marilyn
Published: March 2023

Leadership is generally associated with an individual being in a position of authority, and holding a certain measure of power and influence within an organization. However, for African American women (AAW) in predominantly white organizations, race, gender, and social class may restrict the process of leadership. Rather than being mechanisms of leadership, power and influence may be means of restricting AAW's leadership authority over others.Whites often use their privilege to circumvent, diminish, overrule, and control the actions of blacks in the workplace (Deitch et al., 2003). Even blacks in positions of leadership are subject to having their authority undermined. King and Ferguson (1996) suggest the presence of AAW as leaders in predominantly white organizations is in itself ambiguous in that these roles are beyond the customary expectations for black women. Although the number of AAW leaders in predominantly white organizations is increasing (Catalyst, 2004), the dilemma remains that socially constructed hierarchies of race, gender, and social class together may serve to disempower the process of leadership (Collins, 1999).Furthermore, AAW's marginalized status may limit access to social connections in predominantly white organizations. Access to power as well as the freedom to exercise one's own power and authority often lies in informal social networking systems (Gostnell, 1996). Lack of access to these systems may disadvantage the AAW leader's ability to influence organizational processes and actions.
Black Feminism: An Epistemological Framework for Exploring How Race and Gender Impact Black Women's Leadership Development
Authors: Rosser-Mims Dr. Dionne
Published: March 2023

This paper presents, through the lens of Black feminism, a historical review of the contextual forces that have shaped and hindered African American's women's leadership development.
Gender and Organizational Culture: Perceptions of Leadership Style and Effectiveness
Authors: Cundiff Nicole L
Published: March 2023

The purpose of this paper was to demonstrate changes in the definition of effective leadership and present an argument for how the shift relates to evident changes in perceptions of women leaders. Perceptions of effectiveness estimations for female and male executives were compared, while taking into consideration organizational culture. Scenario methodology was used to manipulate gender, leadership styles, and organizational culture through an experimental online survey looking for differences in perceptions of effectiveness. Findings, in part 1, show that female executives were viewed as more transformational than male executives with no significant differences in perceptions of leadership effectiveness. Leadership style mediated relations between leader gender and perceptions of leadership effectiveness. In part 2, organizational culture was shown to increase the associations of gender and leadership style with expectations of effectiveness. Female leaders may over time be perceived as effective as male leaders, if the present shift in definitions of effective leadership styles continue to align with female gender roles and organizational cultures embrace collective practices. However, this paradigmatic change is slow and women continue to be stereotyped in leadership roles. This paper gives an explanation for why nil results are becoming more prevalent in the literature on gender in leadership.
Equity-Directed Instructional Practices: Beyond the Dominant Perspective
Authors: Rubel Laurie H.
Published: March 2023

In this article, the author synthesizes four equity-directed instructional practices: standards-based mathematics instruction, complex instruction, culturally relevant pedagogy (CRP), and teaching mathematics for social justice (TMfSJ). The author organizes these practices according to the dominant and critical axes in GutiÃ©rrez's (2007a) equity framework. Among 12 teachers from 11 schools in a large urban school district, the author presents case studies of 3 teachers who excelled with the aforementioned dominant equity-directed practices but struggled with the critical practices of connecting to students' experiences called for in CRP and critical mathematics called for in TMfSJ. The analysis explicitly explores the role of whiteness in these struggles. The author presents implications and recommendations for mathematics teacher education on how to better support teachers for equitable teaching that includes these critical equity-directed practices.
Student or Teacher? A Look at How Students Facilitate Public Sensemaking During Collaborative Groupwork
Authors: Lo Michelle , Ruef Jennifer
Published: March 2023

As institutions strive to improve teaching and learning for all, educators must consider equitable instruction. In particular, equitable distributions of authority and agency among students. The authors define distribution of authority as shared opportunities for decision-making in enacting mathematical tasks, and agency as the power to carry out these self-made decisions. Equitable distributions of authority and agency can be enhanced in mathematics public sensemaking classrooms where students participate in discourse as active members of the classroom. In public sensemaking classrooms, students understand and acknowledge one another's ideas, present and revise arguments, and take risks by sharing ideas. This study investigates one group of students and how they positioned one another during mathematical groupwork in a public sensemaking classroom, as well as how the positioning impacted the distribution of agency and authority. Analyses indicate that one student replicates the role of teacher by redistributing authority and agency back to other students. The findings intend to inform classroom teachers of the positioning patterns that may occur during groupwork, and the effectiveness of public sensemaking classrooms on distributing authority and agency equitably during groupwork.
Black Lives Matter in Teaching Mathematics for Social Justice
Authors: Leonard Jacqueline
Published: March 2023

Prior to becoming a mathematics educator, I was a teacher in Prince George’s County, Maryland. Because of the success I experienced with culturally relevant pedagogy (CRP), it became part of my research agenda along with teaching mathematics for social justice (TMfSJ). Databases like 23andme and Ancestry can be used as a context for CRP and TMfSJ. Data related to education, occupation, military service, and voting records can be accessed online. Our ancestors’ experiences can shape our identity and serve as powerful tools for contextualizing mathematics. The stories and counterstories of African Americans can be problematized to show Black lives matter.
A Call for Critical Reads of “Trouble” Texts that Inform Urban Mathematics Education
Authors: Moldavan Alesia Mickle
Published: March 2023

Alesia Mickle Moldavan, the section editor of Critical Reads in the Journal of Urban Mathematics Education, encourages interested contributors to submit reviews of critical texts (e.g., books, research articles, short stories, social media posts, poetry, play/film scripts) in order to push conversations in the field that offer an empowering and transformative vision for urban mathematics education. This call urges scholars to engage in critical thinking and creative rethinking of teaching and learning in the urban context to inspire new critical perspectives that interrogate systemic inequities and illuminate urban excellence. Submissions to Critical Reads ought to critique “trouble” texts to improve educational experiences and outcomes in mathematics for historically marginalized students in urban communities.
A Conversation About Rethinking Criteria for Qualitative and Interpretive Research
Authors: Grant Melva R. , Lincoln Yvonna
Published: March 2023

This editorial shares a conversation about qualitative and interpretive research quality between friends. Dr. Yvonna Lincoln, University Distinguished Professor Emerita at Texas A&M University, has been a pioneer in the field of qualitative and interpretive inquiry research. The purpose of this paper is to share Yvonna Lincoln’s contemporary thinking about quality criteria for qualitative and interpretive inquiry research and to make it available to mathematics educators who conduct qualitative research in urban settings.
Math Links: Building Learning Communities in Urban Settings
Authors: Leonard Jacqueline , Evans Brian R.
Published: March 2023

Learning mathematics in urban settings is often routine and decontextualized rather than inquiry- and culturally-based. Changing prospective teachers’ attitudes about pedagogy in order to change this pattern is often tenuous. The purpose of this pilot study was to provide opportunities for teacher interns enrolled in a graduate certification program to interact with urban students in a community-based program called Math Links. Twelve interns completed 30 hours of fieldwork at church-based sites. Prior to fieldwork, the interns participated in a 3-hour professional development and education session, in addition to their education courses. Three interns’ work with urban children and youth reveal that community-based experiences changed their attitudes about practice and their capacity to teach urban children mathematics in culturally sensitive ways. One in-depth case study of an Asian teacher reveals not only changes in her attitudes and beliefs about urban students but also changes in her pedagogy as she shifted from teaching by telling to guided inquiry.
Comparing Teachers’ Conceptions of Mathematics Education and Student Diversity at Highly Effective and Typical Elementary Schools
Authors: Kitchen Richard S. , Roy Francine Cabral , Lee Okhee , Secada Walter G.
Published: March 2023

In this study, the authors examined what distinguished highly effective from typical elementary schools in mathematics by examining the conceptions of fourth-grade teachers with regards to mathematics education (curriculum, instruction, and assessment) and student diversity (ability, culture, language, and socioeconomic status). The study was conducted in two large urban areas with high proportions of racially/ethnically and linguistically diverse student groups. Interviews were conducted with 32 fourth-grade teachers from 16 elementary schools, including 10 highly effective and 6 typical schools in the two areas. Compelling evidence was found that teachers at highly effective schools had better developed and better articulated conceptions of mathematics education and student diversity. While similar findings were found across the two areas (e.g., teachers’ beliefs about the influence of high-stakes assessment and the academic ability of low-achieving students), differences were also found across the two areas (e.g., teachers’ beliefs about the importance of implementing multiple instructional strategies and expectations for college attendance).
Exploring the Nexus of African American Students’ Identity and Mathematics Achievement
Authors: Nzuki Francis M.
Published: March 2023

In this article, the author explores five African American students’ racial, mathematical, and technological identity construction and how these identities shape each other and the sense of agency exhibited in the process. Data collection for the study included classroom observations and interviews, including a task-based interview. The stories told by the participants, their solutions for the mathematical tasks, and their participation in the figured world of mathematical learning illuminated their sense of identity and agency. An analysis of the data revealed that the participants’ positioning and authoring of their identities were influenced by how they negotiated and interpreted the constraints and affordances in the figured worlds in which they participated. It is through this process of negotiation and interpretation that the participants exhibited a sense of agency, or lack thereof, which, in turn, shaped their opportunities to participate in mathematics and hence the authoring of their mathematical identities.
Caring, Race, Culture, and Power: A Research Synthesis Toward Supporting Mathematics Teachers in Caring With Awareness
Authors: Bartell Tonya
Published: March 2023

In this article, the author draws on theories of care to lay out a theoretical map of sorts on what an effective, caring teacher–student relationship that supports student learning might “look like.” In so doing, theories of culturally relevant pedagogy are considered, as these not only illustrate effective practices caring teachers employ but also because such theories provide models of classroom practices that consider explicitly issues of race, culture, and power. The author aims to illuminate the complex, nuanced, and, at times, overwhelming descriptions of what it means to be a caring teacher in the service of student learning. The author concludes by considering models of professional development that hold potential for supporting mathematics teachers in developing teacher–student relationships reflective of “caring with awareness.”
Preservice Teachers’ Changing Conceptions About Teaching Mathematics in Urban Elementary Classrooms
Authors: Kalchman Mindy
Published: March 2023

In this article, the authors report changes in mathematical disposition, participation, and competencies within a group of Pasifika students as a teacher established the discourse of mathematical inquiry and argumentation. Within a classroom-based design approach, the teacher used a communication and participation framework tool to support students to engage in a range of collective mathematical practices. Drawing on analyses of student interviews conducted over one school year, the authors provide a narrative that illustrates how changes in agency and accountability accompanied shifts in the mathematical inquiry discourse. The results show positive learning outcomes for Pasifika students when the general and mathematical obligations attend to the cultural, social, and mathematical well being of all students in mathematics classrooms.
K–2 Teachers’ Attempts to Connect Out-of-School Experiences to In-School Mathematics Learning
Authors: McCulloch Allison W. , Marshall Patricia L.
Published: March 2023

In this article, the authors report on a 3-year professional development research project. The project focused in general on early mathematics teaching and learning in urban schools and in particular on promoting teachers’ awareness of the importance of making connections between students’ out-of-school experiences to promote deep understanding of K–2 school mathematics. Children cross into school spaces bringing with them a wide variety of out-of-school experiences; this is especially true in the early elementary grades when they have spent more of their lives out of school than in school. Effective teaching at this level requires that teachers put forth concerted efforts to make connections between these out-of-school experiences and formal curricular content. The authors present the strategies that participating teachers (n = 49) employed in their attempts to make such connections as well as implications for future professional development research.
Reflecting Heritage Cultures in Mathematics Learning: The Views of Teachers and Students
Authors: Averill Robin
Published: March 2023

In this article, the author explores the views of six teachers and 136 indigenous (M?ori), Pacific Nations, and New Zealand European students on reflecting the heritage cultures of M?ori and Pacific peoples in mathematics learning. Findings show that teachers responded to students’ cultures through their classroom interactions but not through contexts used in mathematical tasks—participants largely viewed M?ori and Pacific Nations cultures and mathematics learning as distinct. Findings indicate that substantive incorporation of heritage cultures in mathematics instruction requires changes in teacher and student beliefs regarding the place of heritage cultures within mathematics learning and sector and school-based support for teachers to develop their cultural knowledge and understanding of how to utilize such knowledge in their teaching.
Young Children's Mathematics: Whose Home Practices Are Privileged?
Authors: Wager Anita A. , Whyte Kristin
Published: March 2023

In this essay, the authors share a professional dialogue about the ways in which issues of power emerge in preschool classrooms when teachers endeavor to build on children's home and school mathematical experiences and understanding. From different perspectives, as early childhood and mathematics education researchers, the authors discuss ways in which data from teacher interviews and discussions collected during a professional development program provide evidence of whose knowledge is privileged. The authors use the dialogue to explore what, how, and who pre--K teachers most often privileged in their work with children and families in mathematics. And what effect that privileging had on power relationships.
Advocating for Equitable Mathematics Education: Supporting Novice Teachers in Navigating the Sociopolitical Context...
Authors: Willey Craig , Drake Corey
Published: March 2023

In this essay, the authors situate elementary mathematics teacher preparation in a broader, sociopolitical context, one that includes historical patterns of educational privilege and oppression. The authors attend to the effects of “reform” movements that encompass a vast array of stakeholders and interests as well as the growing significance of federal education policy on mathematics teacher education. In particular, they highlight the tensions involved in prospective teachers’ first experiences in attempting to make sense of how research-based theories of learning and practice intersect with local schooling realities. The authors present questions that novice mathematics teachers might ask at the personal, interpersonal, institutional, and cultural levels; questions which hold the potential to disrupt dominant discourses and initiatives in favor of discourses that reframe mathematics education opportunities for oppressed youth in the United States.
K--8 Teachers' Concerns about Teaching Latino/a Students
Authors: Anhalt Cynthia Oropesa , Pérez María Elena Rodríguez
Published: March 2023

In this article, the authors examine elementary and middle school mathematics teachers' concerns about teaching Latino/a student populations across three regions in the United States: southern Arizona, northern New Mexico, and central California. Surveys were administered to 68 teachers who participated in professional development activities on language and culture diversity. Survey questions consisted of items from three domains: (a) concerns about social issues central to teaching Latino/a students, such as discrimination, multiculturalism, and stereotypes; (b) concerns about the task of teaching Latino/a students focusing on methods, strategies, materials, and new ideas for teaching; and (c) concerns about Latino/a students' learning, which dealt with factors that impact student performance in school, such as home environment, family culture, and expectations. In general, the authors found that the surveyed teachers were highly concerned with issues about teaching Latino/a students and their learning and were less concerned about social issues in teaching Latino/a students.
Ethnomodeling as a Research Theoretical Framework on Ethnomathematics and Mathematical Modeling
Authors: Rosa Milton , Orey Daniel Clark
Published: March 2023

In this article, the authors discuss a pedagogical approach that connects the cultural aspects of mathematics with its academic aspects in which they refer to as ethnomodeling. Ethnomodeling is the process of translation and elaboration of problems and questions taken from systems that are part of the daily life of the members of any given cultural group. Here, the authors offer an alternative goal for research, which is the acquisition of both emic and etic forms of knowledge for the implementation of ethnomodeling. They also offer a third perspective on ethnomodeling research, which is the dialectical approach, which makes use of both emic and etic knowledge. Finally, the authors define ethnomodeling as the study of mathematical phenomena within a culture because it is a social construct and culturally bound.
Urban Latina/o Undergraduate Students' Negotiations of Identities and Participation in an Emerging Scholars Calculus I Workshop
Authors: Oppland-Cordell Sarah
Published: March 2023

In this article, the author presents a qualitative multiple case study that explored how two urban Latina/o undergraduate students' emerging mathematical and racial identity constructions influenced their participation in a culturally diverse, Emerging Scholars Program, Calculus I workshop at a predominately White urban university. Drawing on critical race theory and Latina/o critical theory, cross-case analysis illustrates that participants' emerging mathematical and racial identities--co-constructed with their other salient identities--contributed to positively shifting their participation by: (a) changing their perceptions of their and peers' mathematics abilities, (b) allowing them to challenge racialized mathematical experiences, and (c) strengthening their comfort levels in the workshop environment. The Latina/o participants' counter-stories support that the sociopolitical nature of identity development and participation in mathematical learning contexts should be embraced because it provides additional knowledge regarding how and why Latina/o students attain mathematical success.
Black Male Students and The Algebra Project: Mathematics Identity as Participation
Authors: Grant Melva R. , Crompton Helen , Ford Deana J.
Published: March 2023

In this article, the authors examine the mathematics identity development of six Black male students over the course of a 4-year The Algebra Project Cohort Model (APCM) initiative. Mathematics identity here is defined as participation through interactions and positioning of self and others. Data collection included nearly 450 minutes of video recordings of small-group, mathematics problem solving in which student actions, coded as acts of participation, were tallied. These tallied actions were conceptualized descriptively in terms of mathematics identity using the lenses of agency, accountability, and work practices. The analyses suggest that the APCM students' confidence in self and peers increased over the 4 years, they consistently chose to engage in mathematics, and their reliance on knowledgeable others less-ened. Opportunities for future research and implications for policy makers and other stakeholders are discussed.
An Intersectional Analysis of Latin@ College Women's Counter-stories in Mathematics
Authors: Leyva Luis A.
Published: March 2023

In this article, the author discusses the intersectionality of mathematics experiences for two Latin@ college women pursuing mathematics-intensive STEM (science, technology, engineering, and mathematics) majors at a large, predominantly White university. The author employs intersectionality and poststructural theories to explore and make meaning of their experiences in relation to discourses of mathematics ability and pursuits of STEM higher education. A cross-case analysis of two Latin@ college women's counter-stories details the development of success-oriented beliefs and strategies in navigating the discourses that they encountered institutionally and interpersonally in their mathematics experiences. Implications are raised for P--16 mathematics and STEM education to broaden equitable learning opportunities for Latin@ women and other marginalized groups' construction of positive mathematics identities at intersections of gender and other social identities
Industrial effluents of mining enterprises of the North Caucasus and water resources
Authors:   North Caucasus Mining Metallurgical Institute (State Technological University), Dzaparov Viacheslav , Sakhnov Aleksandr ,   North Caucasus Mining Metallurgical Institute (State Technological University), Zdorovets Igor ,   Ural State Mining University, Shokhov Semen ,   Ural State Mining University
Published: March 2023

Subject of research. The article is devoted to the problem of preserving the quality of the global water resources under the threat of its deterioration caused by industrial effluents polluting the hydrosphere. Research objective is to establish the patterns of changes in water resources state and carry out the ecological detailing of the mechanism for managing water quality and protecting water resources. Methods of research include the generalization and systematization of reported data and literature on the aquatic environment condition in the metallic ore mining regions and methods of mine effluents treatment, laboratory experiments on electrochemical treatment of mineralized effluents to restore their quality, recommendations for improving the management of the aquatic environment state. Research results and scope. A distinctive feature of the problem for regions with mountainous terrain is indicated. The surroundings of mining enterprises were ranked according to metal pollution. The research results on the effluents state at non-ferrous metallurgy facilities are presented. The results of research by the precipitation curve method are summarized. The laboratory experiment results are shown on electrochemical treatment of mineralized effluents and their quality restoration. The direction is indicated of improving the economic efficiency of effluents treatment by increasing by-products output. A technology with the generation of self-neutralizing agents is recommended. It has been established that in the case of heavy metal pollution, the extent of the pollution bubble is determined by the processes of chemicals mixing and dilution. Conclusions. The management of water resources quality and industrial effluents pollution prevention should begin with the establishment of patterns of change in their state as well as with the control mechanism detailing in mountainous terrain.
Parametric model for a cutting edge contour of the geokhod cutting body blade
Authors:   T. F. Gorbachev Kuzbass State Technical University, Sadovets Vladimir , Rezanova Elena ,   T. F. Gorbachev Kuzbass State Technical University, Sadovets Roman ,   Bauman Moscow State Technical University (National Research University)
Published: March 2023

a parametric model for a cutting body blade cutting edge contour of geokhod, which is a new class of mining equipment. The research relevance is due to the need to create a unified methodology for forming the cutting body cutting edge for geokhods of various sizes, since the cutting edge design parameters are heavily dependent on geokhod geometry and force parameters. The research objective is to obtain parametric equations for determining the geometric coordinates of the points of the geokhod cutting body blade cutting edge in Cartesian coordinates. Methods of research. The paper describes the principles of parameterization of the complex geometry of geokhod cutting body blade cutting edge. Research methods include the study of blade edge geometry, as well as its design parameters dependence on geokhod’s force and design parameters. To achieve that, analytical dependencies were selected from the method of calculating the cutting body force parameters, and then parametric functions affecting the cutting body cutting edge geometry were selected. Results. As a result, a geometric model of the cutting body cutting edge in a parametric form was obtained. To demonstrate the formation of the blade cutting edge contact with rock based on the obtained parametric-time dependencies, a computer program was developed with the calculated values probability construction. The dependence between the cutting edge geometry and the geokhod design parameters dictated the modeling of the cutting edge shape for geokhods of different diameters. Conclusions. The obtained parametric expressions for calculating the coordinates of geokhod cutting body contact make it possible to build contact lines of the blade and the rock mass according to the input data. Is has also been proved that geokhod cutting edge shape depends on the geokhod diameter, and its geometric parameters will be individual for each type of geokhod
Justifying the power consumption of mine dewatering pumps by the example of the Akkerman mine
Authors:   Nosov Magnitogorsk State Technical University, Olizarenko Vladimir , Burmistrov Konstantin ,   Nosov Magnitogorsk State Technical University, Zubkov Artem ,   Nosov Magnitogorsk State Technical University, Rybakov Aleksandr ,   Nosov Magnitogorsk State Technical University
Published: March 2023

Introduction. The purpose of the power consumption comparative evaluation at the mine dewatering is to clarify the methodology of selecting and calculating the actual parameters of D and CNS centrifugal pumps (Russian manufacturer) and LH (Japan) and Flygt (Sweden) submersible pumps by actual working points of intersection of the force pumps features and the external line design features. The results of calculations of centrifugal and submersible pumps power consumption are given in the tabular form when revising the existing mine dewatering scheme of the Akkerman mine. Methods of research. Characteristics of external lines and quantitative values of constant of suction and discharge pipelines of centrifugal and submersible pumps are determined according to the existing methods. External line characteristics were built on individual characteristics diagrams and working points which confirm actual parameters were defined to compare electric power consumption by the studied unit sizes of centrifugal pumps (D, CNS) and submersible pumps (LH, Flygt). Obtained actual operating modes of centrifugal and submersible pumps are checked for compliance with Federal Norm and Regulations requirements. Results and analysis. The calculation data obtained as well as the calculated quantitative values of electric power consumption of the competitive D and CNS pumps and submersible LH and Flygt pumps, given in the tabular form, show that electric power consumption for mine dewatering by pumps of 1D160-112 size and CNS 300-120–360 size is 20% lower. Scope of results. The results of justification of power consumption of centrifugal pumps for mine dewatering are recommended for implementation by organizations performing research and development of mine dewatering with import substitution of foreign submersible pumps
A method of seismic microzoning based on the vulnerability coefficient
Authors:   Institute of Geophysics UB RAS, Senin Lev , Senina Tatiana ,   Institute of Geophysics UB RAS
Published: March 2023

The research objective is to develop a new method of seismic microzoning (SMZ) based on the spectral ratios between seismic signal’s horizontal and vertical components, i.e. on the vulnerability coefficient of the topmost soil stratum. Methods of research. The HVSR spectral ratio analysis has been used for a long time in various modifications. However, in author’s opinion, what’s new is the approach to seismic hazard zoning proposed in this research. It uses the vulnerability indices and subsequent recalculation into seismic intensity increments. The SMZ method based on the vulnerability coefficient considered in this article is not mandatory, although it is a variation of the spectral ratio method. It may be regarded as an addition to the mandatory seismic stiffness method. The combination of these SMZ methods will arguably increase the capabilities of the method as a whole and improve the accuracy and adequacy of a schematic map of seismic intensity increments. One of the advantages of both spectral ratio method and SMZ method based on the vulnerability index, is that they allow to take into account inelastic and nonlinear deformation processes when strong wave movements impacts on soils. Research results. Based on the calculated spectral characteristics of soils, the method makes it possible to construct schematic SMZ maps for different frequency ranges. Another advantage of the proposed of seismic microzoning method is that it eliminates the requirements for the synchronic microtremor measurements on the studied and reference soils. Moreover, the fact that there is simply no need for reference soils is a prerequisite for the method. The local vulnerability can therefore be assessed using only one seismic recorder with a 3-component sensor ignoring the location of microseismic motions sources and their characteristics variation over time.
The advisability of an underground processing facility at the Voronets iron ore deposit
Authors:   Institute of Mining UB RAS, Sokolov Igor , Solomein Iurii ,   Institute of Mining UB RAS, Smirnov Aleksei ,   Institute of Mining UB RAS, Nikitin Igor ,   Institute of Mining UB RAS
Published: March 2023

Relevance. When mining large iron ore deposits of the Kursk Magnetic Anomaly, one of the main problems is environmental safety, in particular, the maximum preservation of fertile soil. The underground mining method reduces the technogenic load on the natural environment and allows most of the mining waste to be placed in the mined-out space. However, main source of negative environmental impact is the processing production, which occupies large areas and is characterized by intense harmful emissions. Processing facilities placed underground significantly reduce this impact. Research objective is to assess the advisability of building an underground processing facility at the Voronets iron ore deposit. Methods of research. The work uses a comprehensive research method, including rational ore processing scheme justification, underground processing facility design, and a technical and economic comparison. Results. A scheme of ore processing with the production of a high-quality concentrate is presented, and a chain of mechanisms and apparatus for all stages of ore processing is selected, including its crushing, grinding, magnetic separation and dehydration of the resulting products. Based on the parameters of the selected equipment, its underground layout is shown, the volume the processing facility chambers is calculated. It is shown that the entire volume of tailings is located in the chamber goafs of the underground mine and are not lifted to the surface. Conclusions. An approximate assessment of the effectiveness of the processing facility underground location has been made. It has been shown that the cost of building that facility is comparable to the cost of building a similar processing facility on surface. Placing the processing in underground makes it possible to significantly reduce the area of land allotment of the enterprise, to lift only concentrate on the surface, and to eliminate the negative environmental impact of processing production.
SYNCHRONIZATION OF ENVIRONMENTAL LAW TO MINING LAW IN SUSTAINABLE ENVIRONMENTAL MINING GOVERNANCE IN INDONESIAS LEGAL SYSTEM
Authors:   Senior Professor at the Faculty of Law, Halu Oleo University., Jufri Dewa Muh
Published: March 2023

Mining management in Indonesia, should pay attention to aspects of environmental sustainability. The facts show that most of the mining management in Indonesia does not pay attention to aspects of environmental sustainability. For this reason, based on legal norms, mining regulations in Indonesia should be synchronized with environmental regulations. This is the issue of research articles written. Based on the results of research using normative research methods, environmental law norms and mining legal norms synergize where mining law has a very close relationship with environmental law, because every business and mining activity, whether it is related to mineral and coal mining or oil mining and natural gas are required to maintain the continuity of the carrying capacity and capacity of the environment and the preservation of environmental functions.Kata.
MINORITY CARRIERS DENSITY AND RECOMBINATION VELOCITY AT THE BACK FACE OF N+PP+ SILICON SOLAR CELL: EFFECTS OF DOPING RATE AND TEMPERATURE
Authors:   Laboratory of Semiconductors and Solar Energy, Physics Department, Faculty of Science and Technology, University Cheikh Anta Diop of Dakar , Dakar - Senegal., B.A Fatimata , Diallo Sadio Omar ,   Laboratory of Semiconductors and Solar Energy, Physics Department, Faculty of Science and Technology, University Cheikh Anta Diop of Dakar , Dakar - Senegal., Diao Dame ,   Laboratory of Semiconductors and Solar Energy, Physics Department, Faculty of Science and Technology, University Cheikh Anta Diop of Dakar , Dakar - Senegal., Ndiaye Mor ,   Laboratory of Semiconductors and Solar Energy, Physics Department, Faculty of Science and Technology, University Cheikh Anta Diop of Dakar , Dakar - Senegal., Diagne Issa ,   Laboratory of Semiconductors and Solar Energy, Physics Department, Faculty of Science and Technology, University Cheikh Anta Diop of Dakar , Dakar - Senegal.
Published: March 2023

In this article, we have established the expressions of the density of minority charge carriersand the recombination velocity at the back face of our sample.The effects of the base doping rate combined with the effects of temperature on the latter have been the subject of our study.Thus, we followed the evolution of the density of minority charge carriers and of the recombination velocity at the back face as a function of the thickness of the base for different base doping rate and for different values of the temperature.
HARTAL (ARSENICTRISULPHIDE) A CONCEPTUAL STUDY
Authors:   Principal, Prof. And HOD, Dept. of Rasa Shastra Evum Bhaisjya Kalpana, Major S D Singh P G Ayurvedic College And Hospital, Farrukhabad, UP., Saxena Jolly , Om Dixit Shiv ,   Asso. Prof., Dept. of Rasa Shastra Evum Bhaisjya Kalpana, Major S D Singh P G Ayurvedic College And Hospital, Farrukhabad, UP., S. Chandran Irina ,   Asst. Prof., Dept. of Rasa Shastra Evum Bhaisjya Kalpana, Major S D Singh P G Ayurvedic College And Hospital, Farrukhabad, UP., Sxaena Ankur ,   Asst. Prof, Dept. of Rog Nidan Evum Vikriti Vijyan, Major S D Singh P G Ayurvedic College And Hospital, Farrukhabad, UP.
Published: March 2023

In Rasa Shastra Hartal has an important place. It is mentioned under group Uprasa by many Acharyas.1 Best Hartal is Gold like in appearance, reddish yellow colour and heavy weight. It is formed of many thin layers, which are one upon another2. Hartal is a poisonous substance in which Arsenic is present. Hartal is of two kind : A) that which is obtained in Mines. B) that which is prepared at laboratory by the combination of Arsenic and Sulphur. Chemically it is As2S3 and called Orpiment in Morden, which is very important indigenous source of Arsenic. Purified Hartal destroys effect of Vitiated Vata, kapha, Rakta and Visha. It is helpful in curing the skin abnormalities, infectious fever (Bhoot Jwara), Shwas, Kasa, Kushth, Vatarakta, Visarpa. Thus the Purified Hartal is considered as a Rasayana. The cessation of menstrual bleeding can be observed even by the use of Hartal as a single drug.2