scholarly journals Controls on the Effect of Impact Scraping on High-position and Long-runout Landslides

2021 ◽  
Author(s):  
Yang Gao ◽  
Yueping Yin ◽  
Bin Li ◽  
Haoyuan Gao ◽  
Zhuang Li
Keyword(s):  
Developmental Stages ◽  
Sliding Mode ◽  
Gravitational Acceleration ◽  
Long Runout ◽  
Rescue Operation ◽  
High Position ◽  
Theoretical Support ◽  
Field Investigations ◽  
Extensive Field ◽  
The Impact

Abstract Landslides in mountainous areas act as an important control on morphological landscape evolution and represent a major natural hazard. The dynamic characteristics of a landslide directly relate to the distance it traveled and the scale of the resulting disaster. Based on extensive field investigations, we explored the effect of impact scraping on high-position landslides. During a rapid landslide, impact scraping amplifies the volume of the landslide and the size of the area affected by the landslide. Without acknowledging this effect, it is easy to underestimate the risk presented by a given potential landslide. In this study, we investigate the impact scraping of landslides that travel for significant distances both vertically (high-position) and horizontally (long-runout). There are four developmental stages of high-position, long-runout landslides: high-position shearing, gravitational acceleration, impact scraping, and debris deposition. Impact scraping amplifies the scale of the disaster by drastically increasing the volume of the landslide debris. After accounting for the effect of impact scraping, the total volume of the landslide exhibits a strong correlation with its travel distance. Additionally, the material properties of the erodible layer influence the landslide mobility. High-position and long-runout landslides have multiple scraping modes, including the embedding and excavation mode, the entrainment mode, the pushing and sliding mode, and the impact and splashing mode. In this study, we aim to provide insight that will improve the disaster modeling and risk assessment of high-position landslides, as well as to offer theoretical support for high-position and long-runout landslide dynamics research, disaster prevention and mitigation, and first responder rescue operation planning.

Keynote

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Jeanne LIEDTKA
Keyword(s):  
Organizational Performance ◽  
Design Thinking ◽  
Social Systems ◽  
Field Research ◽  
Higher Order ◽  
Lens Design ◽  
Social Sector ◽  
Extensive Field ◽  
Innovative Solutions ◽  
The Impact

The value delivered by design thinking is almost always seen to be improvements in the creativity and usefulness of the solutions produced. This paper takes a broader view of the potential power of design thinking, highlighting its role as a social technology for enhancing the productivity of conversations for change across difference. Examined through this lens, design thinking can be observed to aid diverse sets of stakeholders’ abilities to work together to both produce higher order, more innovative solutions and to implement them more successfully. In this way, it acts as a facilitator of the processes of collectives, by enhancing their ability to learn, align and change together. This paper draws on both the author’s extensive field research on the use of design thinking in social sector organizations, as well as on the literature of complex social systems, to discuss implications for both practitioners and scholars interested in assessing the impact of design thinking on organizational performance.

Developing Effective Dispositions for Teaching Music

2019 ◽  
pp. 321-344
Author(s):  
Michael Raiber
Keyword(s):  
Music Education ◽  
Teacher Educators ◽  
Systematic Approach ◽  
Music Teachers ◽  
Developmental Stages ◽  
Music Teacher ◽  
Teacher Dispositions ◽  
Teacher Concerns ◽  
Teaching Music ◽  
The Impact

The impact of teacher dispositions on the professional development of preservice music teachers (PMTs) has been substantiated. This chapter describes an approach to dispositional development within the structure of an introduction to music education course. A teacher concerns model is used to organize this systematic approach through three developmental stages that include self-concerns, teaching task concerns, and student learning concerns. A series of 11 critical questions are presented for use in guiding PMTs’ dispositional development through these developmental stages. Activities to engage PMTs in the exploration of each of these questions are detailed for use by music teacher educators desiring to engage PMTs in dispositional development.

scholarly journals Exogenous application of growth stimulators improves the condition of maize exposed to soil drought

2021 ◽  
Vol 43 (4) ◽  
Author(s):  
Agnieszka Ostrowska ◽  
Maciej T. Grzesiak ◽  
Tomasz Hura
Keyword(s):  
Plant Growth ◽  
Developmental Stages ◽  
Aminolevulinic Acid ◽  
Stem Elongation ◽  
Development Stage ◽  
Photochemical Activity ◽  
Soil Drought ◽  
Beneficial Effects ◽  
Induced Changes ◽  
The Impact

AbstractSoil drought is a major problem in plant cultivation. This is particularly true for thermophilic plants, such as maize, which grow in areas often affected by precipitation shortage. The problem may be alleviated using plant growth and development stimulators. Therefore, the aim of the study was to analyze the effects of 5-aminolevulinic acid (5-ALA), zearalenone (ZEN), triacontanol (TRIA) and silicon (Si) on water management and photosynthetic activity of maize under soil drought. The experiments covered three developmental stages: three leaves, stem elongation and heading. The impact of these substances applied during drought stress depended on the plant development stage. 5-ALA affected chlorophyll levels, gas exchange and photochemical activity of PSII. Similar effects were observed for ZEN, which additionally induced stem elongation and limited dehydration. Beneficial effects of TRIA were visible at the stage of three leaves and involved leaf hydration and plant growth. A silicon preparation applied at the same developmental stage triggered similar effects and additionally induced changes in chlorophyll levels. All the stimulators significantly affected transpiration intensity at the heading stage.

scholarly journals Influence of Whey Protein Micro-Gel Particles and Whey Protein Micro-Gel Particles-Xanthan Gum Complexes on the Stability of O/W Emulsions

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2301
Author(s):  
Man Zhang ◽  
Bin Liang ◽  
Hongjun He ◽  
Changjian Ji ◽  
Tingting Cui ◽  
...  
Keyword(s):  
Oxidative Stability ◽  
Whey Protein ◽  
High Speed ◽  
Xanthan Gum ◽  
Physical Stability ◽  
Theoretical Support ◽  
Gel Particles ◽  
Oil In Water ◽  
The Stability ◽  
The Impact

Appropriate pretreatment of proteins and addition of xanthan gum (XG) has the potential to improve the stability of oil-in-water (O/W) emulsions. However, the factors that regulate the enhancement and the mechanism are still not clear, which restricts the realization of improving the emulsion stability by directional design of its structure. Therefore, the effects of whey protein micro-gel particles (WPMPs) and WPMPs-XG complexes on the stability of O/W emulsion were investigated in this article to provide theoretical support. WPMPs with different structures were prepared by pretreatment (controlled high-speed shear treatment of heat-set WPC gels) at pH 3.5–8.5. The impact of initial WPC structure and XG addition on Turbiscan Indexes, mean droplet size and the peroxide values of O/W emulsions was investigated. The results indicate that WPMPs and XG can respectively inhibit droplet coalescence and gravitational separation to improve the physical stability of WPC-stabilized O/W emulsions. The pretreatment significantly enhanced the oxidative stability of WPC-stabilized O/W emulsions. The addition of XG did not necessarily enhance the oxidative stability of O/W emulsions. Whether the oxidative stability of the O/W emulsion with XG is increased or decreased depends on the interface structure of the protein-XG complex. This study has significant implications for the development of novel structures containing lipid phases that are susceptible to oxidation.

scholarly journals NonlinearL2-Gain Analysis of Hybrid Systems in the Presence of Sliding Modes and Impacts

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
T. Osuna ◽  
O. E. Montano ◽  
Y. Orlov
Keyword(s):  
Sliding Mode ◽  
Numerical Study ◽  
Sufficient Conditions ◽  
Disturbance Attenuation ◽  
Sliding Modes ◽  
Time Dynamics ◽  
Attenuation Level ◽  
Disturbance Factor ◽  
Disturbance Attenuation Level ◽  
The Impact

TheL2-gain analysis is extended towards hybrid mechanical systems, operating under unilateral constraints and admitting both sliding modes and collision phenomena. Sufficient conditions for such a system to be internally asymptotically stable and to possessL2-gain less than ana priorigiven disturbance attenuation level are derived in terms of two independent inequalities which are imposed on continuous-time dynamics and on discrete disturbance factor that occurs at the collision time instants. The former inequality may be viewed as the Hamilton-Jacobi inequality for discontinuous vector fields, and it is separately specified beyond and along sliding modes, which occur in the system between collisions. Thus interpreted, the former inequality should impose the desired integral input-to-state stability (iISS) property on the Filippov dynamics between collisions whereas the latter inequality is invoked to ensure that the impact dynamics (when the state trajectory hits the unilateral constraint) are input-to-state stable (ISS). These inequalities, being coupled together, form the constructive procedure, effectiveness of which is supported by the numerical study made for an impacting double integrator, driven by a sliding mode controller. Desired disturbance attenuation level is shown to satisfactorily be achieved under external disturbances during the collision-free phase and in the presence of uncertainties in the transition phase.

Mothering Identity Experiences: A Backwards Glance

2021 ◽  
pp. 106648072110239
Author(s):  
Robyn T. Simmons ◽  
Kelly Coker ◽  
Brooks B. Hanks ◽  
Donna S. Sheperis ◽  
Lynn Bohecker
Keyword(s):  
Growth And Development ◽  
Developmental Stages ◽  
Human Growth ◽  
Professional Literature ◽  
Developmental Progression ◽  
Letting Go ◽  
Human Growth And Development ◽  
The Impact ◽  
Universal Themes

Aspects of human growth and development have been studied since the inception of psychology as a field of science. The impact of the quality of mothering on children has been highly researched. However, little attention has been paid in the professional literature to the experiences of mothers as their children move through developmental stages. The focus of this hermeneutic phenomenology study was to investigate how mothers’ experiences of their child's growth and development changed her perceptions of her identity and herself. Participants were eight women who had launched the oldest child from the home within the last 2 years. Extensive data analysis and triangulation procedures were conducted to develop themes. Universal themes experienced by all participants were categorized as internal (questioning, comparison, being purposeful, and feeling supported) and external (experiencing joy). Some participant experiences were influenced by incidental themes such as subsequent children, expectations versus reality, and spirituality. Participants’ experience of their mothering role was also impacted by the process of letting go through the developmental progression of their children. Clinical implications are discussed.

A study on the impact of digital tobacco logistics on tobacco supply chain performance: taking the tobacco industry in Guangxi as an example

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xiaoping Shen ◽  
Yeheng Zhang ◽  
Yumei Tang ◽  
Yuanfu Qin ◽  
Nan Liu ◽  
...  
Keyword(s):  
Supply Chain ◽  
Tobacco Industry ◽  
Indicator System ◽  
Supply Chain Performance ◽  
Dynamics Model ◽  
Content Type ◽  
Chain Operation ◽  
Theoretical Support ◽  
Supply Chain Operation ◽  
The Impact

PurposeThis paper, with the tobacco industry as the background, establishes an indicator system for tobacco supply chain performance evaluation using the FAHP method.Design/methodology/approachBased on the relevant data of tobacco enterprises in Guangxi, the paper calculates the performance values of tobacco companies in various cities of Guangxi, and through the analysis of each indicator and the performance values of each city, the authors find that the improvement ability has a major impact on tobacco supply chain performance. Then, the paper establishes a system dynamics model to further demonstrate the impact of information digitalization on the performance of the tobacco supply chain in Guangxi, thus providing theoretical support for building digital tobacco logistics in Guangxi.FindingsThe findings of the study show that the performance of the tobacco supply chains in various cities of Guangxi is generally at the level of “Pass–Good,” which can barely meet the requirements of tobacco supply chain operation, but there is still plenty of room for improvement.Originality/valueThe authors show that digital and IT-based empowerment can maximize the performance of Guangxi's tobacco logistics performance.

Local Civil Society

2021 ◽  
Author(s):  
Robin Mann ◽  
David Dallimore ◽  
Howard Davis ◽  
Graham Day ◽  
Maria Eichsteller
Keyword(s):  
Civil Society ◽  
Local Community ◽  
Local Level ◽  
Economic Transformation ◽  
Community Relations ◽  
Field Investigations ◽  
The Everyday ◽  
State And Local ◽  
The Impact ◽  
Focus Questions

Epdf and ePUB available Open Access under CC-BY-NC licence. Drawing on place-based field investigations and new empirical analysis, this original book investigates civil society at local level. The concept of civil society is contested and multifaceted, and this text offers assessment and clarification of debates concerning the intertwining of civil society, the state and local community relations. Analysing two Welsh villages, the authors examine the importance of identity, connection with place and the impact of social and spatial boundaries on the everyday production of civil society. Bringing into focus questions of biography and temporality, the book provides an innovative account of continuities and changes within local civil society during social and economic transformation.

Dynamic vacuum pressure tracking control with high-speed on-off valves

2018 ◽  
Vol 232 (10) ◽  
pp. 1325-1336 ◽  
Author(s):  
Gang Yang ◽  
Kai Chen ◽  
Linglong Du ◽  
Jingmin Du ◽  
Baoren Li
Keyword(s):  
Mass Flow ◽  
Pulse Width ◽  
High Speed ◽  
Pulse Width Modulation ◽  
Sliding Mode ◽  
Tracking System ◽  
Vacuum Pressure ◽  
Chamber Pressure ◽  
Asymmetric Structure ◽  
The Impact

A vacuum pressure tracking system with high-speed on-off valves is a discontinuous system due to the discrete nature of high-speed on-off valves. Chamber pressure changes in the system are determined by the mass flow rates during the processes of charging and discharging. Here, a sliding mode controller with an asymmetric compensator based on average mass flow rate is designed for accurate vacuum pressure tracking. The controller output signal is converted into the duty cycles of the high-speed on-off valves via a pulse width modulation pulsing scheme. Owing to the extreme asymmetry of the processes, an asymmetric structure comprising one high-speed on-off valve in the charging unit and three high-speed on-off valves in the discharging unit is applied to weaken the impact of asymmetry. In addition, an asymmetric compensator is also designed to modify the pulse width modulation pulsing scheme to further eliminate the asymmetry. Experimental results indicate that the proposed controller achieves better performance in pressure tracking with the asymmetric compensator overcoming process asymmetry and enhancing system robustness.

scholarly journals Effect of Elevated CO2 on Biomolecules’ Accumulation in Caraway (Carum carvi L.) Plants at Different Developmental Stages

Plants ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 2434
Author(s):  
Hamada AbdElgawad ◽  
Mohammad K. Okla ◽  
Saud S. Al-amri ◽  
Abdulrahman AL-Hashimi ◽  
Wahida H. AL-Qahtani ◽  
...  
Keyword(s):  
Elevated Co2 ◽  
Developmental Stages ◽  
Co2 Enrichment ◽  
Biomass Accumulation ◽  
Antibacterial Activities ◽  
Mature Stage ◽  
Plant Metabolites ◽  
Phytochemical Content ◽  
The Impact ◽  
Phytochemical Contents

Caraway plants have been known as a rich source of phytochemicals, such as flavonoids, monoterpenoid glucosides and alkaloids. In this regard, the application of elevated CO2 (eCO2) as a bio-enhancer for increasing plant growth and phytochemical content has been the focus of many studies; however, the interaction between eCO2 and plants at different developmental stages has not been extensively explored. Thus, the present study aimed at investigating the changes in growth, photosynthesis and phytochemicals of caraway plants at two developmental stages (sprouts and mature tissues) under control and increased CO2 conditions (ambient CO2 (a CO2, 400 ± 27 μmol CO2 mol−1 air) and eCO2, 620 ± 42 μmol CO2 mol−1 air ppm). Moreover, we evaluated the impact of eCO2-induced changes in plant metabolites on the antioxidant and antibacterial activities of caraway sprouts and mature plants. CO2 enrichment increased photosynthesis and biomass accumulation of both caraway stages. Regarding their phytochemical contents, caraway plants interacted differently with eCO2, depending on their developmental stages. High levels of CO2 enhanced the production of total nutrients, i.e., carbohydrates, proteins, fats and crude fibers, as well as organic and amino acids, in an equal pattern in both caraway sprouts and mature plants. Interestingly, the eCO2-induced effect on minerals, vitamins and phenolics was more pronounced in caraway sprouts than the mature tissues. Furthermore, the antioxidant and antibacterial activities of caraway plants were enhanced under eCO2 treatment, particularly at the mature stage. Overall, eCO2 provoked changes in the phytochemical contents of caraway plants, particularly at the sprouting stage and, hence, improved their nutritive and health-promoting properties.

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