title: Circular supply chain management: a bibliometric analysis-based literature review

authors: Zhang, Abraham

abstract: Purpose: Supply chain management (SCM) research has contributed to the transition to a circular economy (CE). Still, confusions exist on the related terms, and no review has mapped out the development trends in the domain. This research clarifies the boundaries of the relevant concepts. Then, it conducts a comprehensive review of the circular SCM (CSCM) literature and identifies opportunities for future research. Design/methodology/approach: Using relevant keywords, 1,130 journal articles published in December 31, 2021 were identified. Unlike the published reviews, which mainly relied on content analysis, this review uses bibliometric analysis tools, including citation analysis, co-citation analysis and cluster analysis. The review identifies general trends, influential researchers, high-impact publications, citation patterns and established and emergent research themes. Findings: The extant CSCM literature includes five prominent clusters: (1) reverse channel optimization; (2) CSCM review and empirical studies; (3) closed-loop supply chain (CLSC) and consumers; (4) CLSC and inventory management and (5) CLSC and reverse logistics (RL). Significant research gaps exist in the use of secondary and longitudinal data, a wider range of theories, mixed-methods, multi-method, action research and behavioral experiment. The least researched topics include zero waste, industrial symbiosis, circular product design, sourcing and supply management and reuse. Originality/value: This is the first bibliometric analysis-based literature review on CSCM. It clarifies the interrelated supply chain sustainability terms and thus reduces related confusion. It offers insights into the patterns in the CSCM literature and suggests important research directions.

text: Circular supply chain management: a bibliometric analysis-based literature review Purpose: Supply chain management (SCM) research has contributed to the transition to a circular economy (CE). Still, confusions exist on the related terms, and no review has mapped out the development trends in the domain. This research clarifies the boundaries of the relevant concepts. Then, it conducts a comprehensive review of the circular SCM (CSCM) literature and identifies opportunities for future research. Design/methodology/approach: Using relevant keywords, 1,130 journal articles published in December 31, 2021 were identified. Unlike the published reviews, which mainly relied on content analysis, this review uses bibliometric analysis tools, including citation analysis, co-citation analysis and cluster analysis. The review identifies general trends, influential researchers, high-impact publications, citation patterns and established and emergent research themes. Findings: The extant CSCM literature includes five prominent clusters: (1) reverse channel optimization; (2) CSCM review and empirical studies; (3) closed-loop supply chain (CLSC) and consumers; (4) CLSC and inventory management and (5) CLSC and reverse logistics (RL). Significant research gaps exist in the use of secondary and longitudinal data, a wider range of theories, mixed-methods, multi-method, action research and behavioral experiment. The least researched topics include zero waste, industrial symbiosis, circular product design, sourcing and supply management and reuse. Originality/value: This is the first bibliometric analysis-based literature review on CSCM. It clarifies the interrelated supply chain sustainability terms and thus reduces related confusion. It offers insights into the patterns in the CSCM literature and suggests important research directions.

year: 2023-01-20

title: Estimating pre-historic earthquake parameters in the Hamilton lowlands using laboratory geotechnical analyses of seismically liquefied volcanic-ash layers in lakes

authors: Chaneva, Jordanka

abstract: Soft-sediment deformation structures caused by pre-historic earthquakes were discovered in volcanicash (tephra) units preserved as discrete layers within soft, organic lake sediments in the Hamilton lowlands, North Island, New Zealand. Complementing a broader paleoliquefaction project that involves geological and seismological perspectives as well, this PhD research was focused on a geotechnical approach in analysing the paleoliquefaction features in the tephra layers across multiple 20 cal-ka-aged lakes in the Hamilton lowlands. Aiming to back-analyse pre-historic earthquakes that might have caused the palaeoliquefaction features, this thesis also had to address literature and knowledge gaps related to cyclic undrained behaviour and liquefaction resistance of pumiceous silts and sand-silt mixtures. Thus, the scope of this research covered the following objectives: (1) analyses of the geotechnical properties of the tephras of interest in order to define their liquefaction susceptibility, (2) investigation of the undrained monotonic and cyclic behaviour of a pumiceous silt (Tuhua silt, from lacustrine Tuhua tephra aged 7.6 cal ka) in order to fill knowledge gaps related to potential particle crushing affecting undrained cyclic behaviour as well as liquefaction resistance in pumiceous silts, (3) identification of the potential threshold of pumice content and/or fines content, at which pumiceous sand-silt mixtures (internal beds from lacustrine Mamaku tephra aged 8.0 cal ka) become crushable, and finally (4) developing a framework, that extends laboratory obtained liquefaction resistance ratios of three different beds of one of the tephras of interest, that provided enough volume for cyclic undrained triaxial testing (Mamaku tephra), into the rest of the tephras across the studied lakes (that only provided small volumes for sampling). The last objective assisted in reaching the main aim of this thesis which was to obtain the equivalent triggering earthquake parameters, i.e., peak ground acceleration, amax and earthquake magnitude, M for the tephras across the lakes, based on their estimated liquefaction resistances. It was found that the tephras in the lakes are pumiceous and liquefiable within the grain-size range: silts to sandy silts to silty sands. The results from undrained triaxial testing on the pumiceous silt showed that no particle crushing occurred and that the silty material behaved closer to the typical trends established for hard-grained soils than to those associated with pumiceous sands. Furthermore, the undrained cyclic triaxial testing program on three different beds, one silt and two silty sands, from one of the tephras of interest (Mamaku tephra), suggested a fines threshold below which begin to crush during cyclic triaxial testing to be somewhere between 31% and 20%. Empirical correlations used to estimate earthquake parameters from liquefaction resistance that are derived for hard-grained soils were, thus, considered reasonable for application to the pumiceous materials considered in the current study. The final results of this study showed that the tephra layers across the lakes were very sensitive and vulnerable to liquefaction at very low peak ground accelerations, i.e. amax ranging from 0.02 to 0.08 g within the range of magnitudes, M = 5 to 8.5. The high vulnerability to liquefaction across all the Mamaku tephra layers in the Hamilton lowlands (~13 lakes) was considered to be the result of the very low in-situ overburden stresses, consequence of their shallow burial depths in the lake environment, as well as the relatively low liquefaction resistance in situ. The results presented in this dissertation, (1) supply valuable information about the liquefaction potential of pre-historically liquefied tephra layers, assisting local paleoliquefaction studies in the Hamilton lowlands area, (2) explore the possibility of applying laboratory-based liquefaction resistance analysis in paleoliquefaction studies, and (3) contribute to better understanding of the undrained behaviour and liquefaction resistance of pumiceous sand-silt mixtures.

text: Estimating pre-historic earthquake parameters in the Hamilton lowlands using laboratory geotechnical analyses of seismically liquefied volcanic-ash layers in lakes Soft-sediment deformation structures caused by pre-historic earthquakes were discovered in volcanicash (tephra) units preserved as discrete layers within soft, organic lake sediments in the Hamilton lowlands, North Island, New Zealand. Complementing a broader paleoliquefaction project that involves geological and seismological perspectives as well, this PhD research was focused on a geotechnical approach in analysing the paleoliquefaction features in the tephra layers across multiple 20 cal-ka-aged lakes in the Hamilton lowlands. Aiming to back-analyse pre-historic earthquakes that might have caused the palaeoliquefaction features, this thesis also had to address literature and knowledge gaps related to cyclic undrained behaviour and liquefaction resistance of pumiceous silts and sand-silt mixtures. Thus, the scope of this research covered the following objectives: (1) analyses of the geotechnical properties of the tephras of interest in order to define their liquefaction susceptibility, (2) investigation of the undrained monotonic and cyclic behaviour of a pumiceous silt (Tuhua silt, from lacustrine Tuhua tephra aged 7.6 cal ka) in order to fill knowledge gaps related to potential particle crushing affecting undrained cyclic behaviour as well as liquefaction resistance in pumiceous silts, (3) identification of the potential threshold of pumice content and/or fines content, at which pumiceous sand-silt mixtures (internal beds from lacustrine Mamaku tephra aged 8.0 cal ka) become crushable, and finally (4) developing a framework, that extends laboratory obtained liquefaction resistance ratios of three different beds of one of the tephras of interest, that provided enough volume for cyclic undrained triaxial testing (Mamaku tephra), into the rest of the tephras across the studied lakes (that only provided small volumes for sampling). The last objective assisted in reaching the main aim of this thesis which was to obtain the equivalent triggering earthquake parameters, i.e., peak ground acceleration, amax and earthquake magnitude, M for the tephras across the lakes, based on their estimated liquefaction resistances. It was found that the tephras in the lakes are pumiceous and liquefiable within the grain-size range: silts to sandy silts to silty sands. The results from undrained triaxial testing on the pumiceous silt showed that no particle crushing occurred and that the silty material behaved closer to the typical trends established for hard-grained soils than to those associated with pumiceous sands. Furthermore, the undrained cyclic triaxial testing program on three different beds, one silt and two silty sands, from one of the tephras of interest (Mamaku tephra), suggested a fines threshold below which begin to crush during cyclic triaxial testing to be somewhere between 31% and 20%. Empirical correlations used to estimate earthquake parameters from liquefaction resistance that are derived for hard-grained soils were, thus, considered reasonable for application to the pumiceous materials considered in the current study. The final results of this study showed that the tephra layers across the lakes were very sensitive and vulnerable to liquefaction at very low peak ground accelerations, i.e. amax ranging from 0.02 to 0.08 g within the range of magnitudes, M = 5 to 8.5. The high vulnerability to liquefaction across all the Mamaku tephra layers in the Hamilton lowlands (~13 lakes) was considered to be the result of the very low in-situ overburden stresses, consequence of their shallow burial depths in the lake environment, as well as the relatively low liquefaction resistance in situ. The results presented in this dissertation, (1) supply valuable information about the liquefaction potential of pre-historically liquefied tephra layers, assisting local paleoliquefaction studies in the Hamilton lowlands area, (2) explore the possibility of applying laboratory-based liquefaction resistance analysis in paleoliquefaction studies, and (3) contribute to better understanding of the undrained behaviour and liquefaction resistance of pumiceous sand-silt mixtures.

year: 2024

title: Relational Responsive Pedagogy, Teachers and Māori students Listening and Learning from each other

authors: Joyce, Chrisandra Itirana

subjects: Relational Pedagogy

abstract: This thesis examines the culturally responsive and relational pedagogical practices of a group of teachers in one Phase four Te Kotahitanga school. It then considers the influences of these pedagogies on four Māori students.
The thesis begins by seeking to understand the two different worldviews in Aotearoa/New Zealand (a Western worldview and a Māori worldview) and some of the discourses that have emerged in the shared Māori and colonial history of this country. It examines kaupapa Māori as both a movement of resistance to the dominant Western worldview that came with colonisation; and a movement of revitalisation to Māori ways of knowing and understanding the world that began to be lost at the same time. It focuses on Te Kotahitanga as a kaupapa Māori response in secondary schools.
The collaborative storying of teachers and Māori students in a Te Kotahitanga school alongside their data of practice and achievement are discussed and examined. Shifts across three levels of the school are identified and understood alongside the Te Kotahitanga professional development cycle. These understandings are discussed in relation to Māori metaphors.  The overall implications of Māori metaphors in relation to the research questions are then considered.
This thesis concludes with considerations and implications for others in addressing the on-going educational disparities of Māori students in mainstream educational settings in New Zealand.

text: Relational Responsive Pedagogy, Teachers and Māori students Listening and Learning from each other This thesis examines the culturally responsive and relational pedagogical practices of a group of teachers in one Phase four Te Kotahitanga school. It then considers the influences of these pedagogies on four Māori students.
The thesis begins by seeking to understand the two different worldviews in Aotearoa/New Zealand (a Western worldview and a Māori worldview) and some of the discourses that have emerged in the shared Māori and colonial history of this country. It examines kaupapa Māori as both a movement of resistance to the dominant Western worldview that came with colonisation; and a movement of revitalisation to Māori ways of knowing and understanding the world that began to be lost at the same time. It focuses on Te Kotahitanga as a kaupapa Māori response in secondary schools.
The collaborative storying of teachers and Māori students in a Te Kotahitanga school alongside their data of practice and achievement are discussed and examined. Shifts across three levels of the school are identified and understood alongside the Te Kotahitanga professional development cycle. These understandings are discussed in relation to Māori metaphors.  The overall implications of Māori metaphors in relation to the research questions are then considered.
This thesis concludes with considerations and implications for others in addressing the on-going educational disparities of Māori students in mainstream educational settings in New Zealand.

year: 2012