scholarly journals Forward and inverse models relating river long profile to monotonic step-changes in tectonic rock uplift rate history: A theoretical perspective under a nonlinear slope-erosion dependency

2021 ◽  
Author(s):  
Yizhou Wang ◽  
Liran Goren ◽  
Dewen Zheng ◽  
Huiping Zhang
2021 ◽  
Author(s):  
Yizhou Wang ◽  
Liran Goren ◽  
Dewen Zheng ◽  
Huiping Zhang

Abstract. The long profile of rivers is widely considered as a recorded of tectonic uplift rate. Knickpoints form in response to rate changes and faster rates produce steeper channel segments. However, when the exponent relating fluvial incision to river slope, n, is not unity, the links between tectonic rates and channel profile are complicated by channel dynamics that consume and form river segments. Here, we explore non-linear cases leading to channel segment consumption and develop a Lagrangian analytic model for knickpoint migration. We derive a criterion for knickpoint preservation and merging, and develop a forward analytic model that resolves knickpoint and long profile evolution before and after knickpoint merging. We further propose a linear inverse scheme to infer tectonic history from river profiles when all knickpoints are preserved. Our description provides a new framework to explore the links between tectonic uplift rates and river profile evolution when n is not unity.


Pflege ◽  
1999 ◽  
Vol 12 (1) ◽  
pp. 21-27
Author(s):  
Marit Kirkevold

Eine Übersicht der bestehenden Literatur weist auf Unsicherheiten bezüglich der spezifischen Rolle der Pflegenden in der Rehabilitation von Hirnschlagpatientinnen und -patienten hin. Es existieren zwei unterschiedliche Begrifflichkeiten für die Rolle der Pflegenden, keine davon bezieht sich auf spezifische Rehabilitationsziele oder Patientenergebnisse. Ein anfänglicher theoretischer Beitrag der Rolle der Pflege in der Genesung vom Hirnschlag wird als Struktur unterbreitet, um die therapeutischen Aspekte der Pflege im Koordinieren, Erhalten und Üben zu vereinen. Bestehende Literatur untermauert diesen Beitrag. Weitere Forschung ist jedoch notwendig, um den spezifischen Inhalt und Fokus der Pflege in der Genesung bei Hirnschlag zu entwickeln.


2015 ◽  
Vol 8 (2) ◽  
pp. 61
Author(s):  
Juella Rumiris

The use of portfolios as an assessment tool probably is unlikely common in Asian countries. Portfolios is commonly considered as a compilation of students’ work for a certain period of time. In fact, the portfolios may show the originality of and the nature of students’ learning improvement. In this paper, the writer will discuss portfolios as a method of assessment in English as Second Language or English as Foreign Language (ESL/EFL) classroom context from teacher’s perspective. This paper is designed with this format order: firstly to explain about the degree of portfolios method to assess content, skills and knowledge in the teach-ing-learning program in the ESL/EFL context, to correlate portfolios system to model of curriculum planning and policy context. Secondly, to discuss the strengths and weaknesses of portfolios method from a theoretical perspective, and analyse the validity, reliability, and fairness. Thirdly, to specify the association of portfolios method and the types of assessment and the correlation of portfolios method with assessment for learning. Fourthly, to evaluate the degree of portfolios method of assessment promoting learning of the knowledge, skills, and abilities related to my teaching experience.Keywords : Portfolios, Assessment, Curriculum, Learning, Knowledge, Skills.


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