A list of macroinvertebrates in Dutch water types: A first step towards an ecological classification of surface waters based on key factors

1992 ◽  
Vol 25 (3) ◽  
pp. 241-259 ◽  
Author(s):  
P. F. M. Verdonschot ◽  
L. W. G. Higler ◽  
W. F. Hoek ◽  
J. G. M. Cuppen
Keyword(s):  
Surface Waters ◽  
Ecological Classification ◽  
Key Factors ◽  
Water Types

scholarly journals A CONTROL LIST FOR THE SYSTEMATIC IDENTIFICATION OF DISTURBANCE FACTORS

2021 ◽  
Vol 1 ◽  
pp. 51-60
Author(s):  
Peter Welzbacher ◽  
Gunnar Vorwerk-Handing ◽  
Eckhard Kirchner
Keyword(s):  
Literature Review ◽  
Product Development ◽  
Model Theory ◽  
Development Process ◽  
Product Development Process ◽  
Key Factors ◽  
Starting Point ◽  
Disturbance Factor ◽  
Systematic Identification

AbstractThe importance of considering disturbance factors in the product development process is often emphasized as one of the key factors to a functional and secure product. However, there is only a small number of tools to support the developer in the identification of disturbance factors and none of them yet ensures that the majority of occurring disturbance factors is considered. Thus, it is the aim of this contribution to provide a tool in form of a control list for the systematic identification of disturbance factors. At the beginning of this contribution, the terms “disturbance factor” and “uncertainty” are defined based on a literature review and different approaches for the classification of uncertainty are presented. Subsequently, the fundamentals of multipole based model theory are outlined. Moreover, a first approach in terms of a control list for a systematic identification of disturbance factors is discussed. Based on the discussed approach and taking the identified weaknesses as a starting point, a control list is presented that combines the existing basic concept of the control list with the fundamentals of multipole based model theory.

Small Bowel Obstruction

2010 ◽  
Vol 21 (2) ◽  
pp. 187-194
Author(s):  
Colleen Trevino
Keyword(s):  
Small Bowel ◽  
Physical Examination ◽  
Surgical Intervention ◽  
Signs And Symptoms ◽  
Bowel Ischemia ◽  
Key Factors ◽  
The Past ◽  
Factors Influencing ◽  
Imaging Response

Strategies for the management of small bowel obstructions have changed significantly over the years. Nonoperative medical management has become the mainstay of treatment of many small bowel obstructions. However, the key to the management of small bowel obstructions is identifying those patients who need surgical intervention. Identification of those at risk for bowel ischemia and bowel death is an art as much as it is a science. Using the current literature and the past knowledge regarding small bowel obstructions, the clinician must carefully identify the signs and symptoms that suggest the need for operative intervention. Classification of the obstruction, history and physical examination, imaging, response to decompression and resuscitation, and resolution or progression of symptoms are the key factors influencing the management of small bowel obstructions.

On the ecological classification of inland saline waters

1968 ◽  
Vol 2 (6) ◽  
pp. 449-457 ◽  
Author(s):  
Horst Ziemann
Keyword(s):  
Ecological Classification ◽  
Saline Waters

A Priori Typology-Based Prediction of Benthic Macroinvertebrate Fauna for Ecological Classification of Rivers

2008 ◽  
Vol 42 (5) ◽  
pp. 894-906 ◽  
Author(s):  
Jukka Aroviita ◽  
Esa Koskenniemi ◽  
Juho Kotanen ◽  
Heikki Hämäläinen
Keyword(s):  
A Priori ◽  
Benthic Macroinvertebrate ◽  
Ecological Classification ◽  
Macroinvertebrate Fauna

scholarly journals TO THE QUESTION OF COMPREHENSIVE ASSESSMENT OF SURFACE WATER IN THE CENTRAL CAUCASUS DURING WINTER BETWEEN AND SUMMER FLOOD

2021 ◽  
Vol 6 (5(55)) ◽  
pp. 22-27
Author(s):  
Liliya Zuberovna Zhinzhakova ◽  
Elena Alexandrovna Cherednik
Keyword(s):  
Water Quality ◽  
Surface Waters ◽  
Inorganic Nitrogen ◽  
High Water ◽  
Polluted Water ◽  
Trace Impurities ◽  
Central Caucasus ◽  
Summer Flood

Based on long-term observations, the assessment of the pollution of the rivers of the Central Caucasus was carried out by comparing the calculated coefficients of the complexity of pollution and the specific combinatorial index of pollution of surface waters, and the quality classes were determined. The results of chemical analysis of the concentration levels of trace impurities (Mo, Pb, Zn, V, Ni, Cr, Mn, Ag) and inorganic nitrogen compounds (NO2 -, NO3 — and NH4 +) in the waters of 13 rivers in two permanent sections of each watercourse were used. The results of calculating the indicators of pollution in the waters of rivers of winter low water and summer high water are presented. The most polluted watercourses and the frequency of pollution in each river are identified, estimated by the values of the specific combinatorial index of water pollution, the coefficient of complexity of pollution, and the class of water quality is presented. The assessment of the most polluted water bodies during the winter low-water period and summer flood is given according to the classification of water quality. According to long-term observations, the features of watercourses and their differences in terms of pollution are presented.

Canada's National Ecological Framework: An asset to reporting on the health of Canadian forests

2001 ◽  
Vol 77 (1) ◽  
pp. 111-115 ◽  
Author(s):  
Harry Hirvonen
Keyword(s):  
Forest Health ◽  
Forest Service ◽  
Ecological Framework ◽  
Single Element ◽  
Ecological Classification ◽  
International Reporting ◽  
Ecological Land Classification ◽  
Reporting Framework ◽  
Ecosystem Classification

The Canadian Forest Service, in cooperation with its partners, has a mandate to report on the health of Canada's forests and determine if, how, and why it is changing. A holistic perspective of forest health is taken whereby the ecosystem rather than a single element is considered. The use of the national ecological classification of Canada as a key reporting framework facilitates this task. Advantages for reporting purposes are several, including the use of ecological over jurisdictional boundaries to discuss ecosystems, wide national acceptance of the framework, and access to a wide array of other environmental databases that use the same framework. Compromises have to be made for forest health reporting as the ecological classification is not a forest ecosystem classification. However, advantages to using the framework for national reporting far outweigh these shortcomings. Key words: ecological land classification, forest health, national and international reporting

scholarly journals La evolución de la bóveda maya a través de la forma de las dovelas

2020 ◽  
Vol 55 ◽  
pp. 65-87
Author(s):  
Laura Gilabert Sansalvador
Keyword(s):  
Comparative Analysis ◽  
Temporal Evolution ◽  
Technological Evolution ◽  
Key Factors ◽  
Technical Developments ◽  
Maya Architecture ◽  
Different Types

Over more than ten centuries, Maya vaults had great technical developments that allowed to achieve constructive and structural advanced systems and increasingly improved forms. One of the key factors to consider when studying its temporal evolution and the different regional variants is the stone vaults shape. This work is based on data collected during fieldwork and comparative analysis of a wide sample of vaults from different geographical zones and chronological periods, and as a result proposes a classification of the Maya stone vaults. The study of the influence of stereotomy on its form and the analysis of the use of different types of stone vaults by zones offer new data to understand the technological evolution of vaulted Maya architecture and the transfers of building knowledge.

scholarly journals Comparison of Lake Optical Water Types Derived from Sentinel-2 and Sentinel-3

2019 ◽  
Vol 11 (23) ◽  
pp. 2883 ◽  
Author(s):  
Soomets ◽  
Uudeberg ◽  
Jakovels ◽  
Zagars ◽  
Reinart ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Lake Water ◽  
Natural Waters ◽  
Critical Role ◽  
Inland Waters ◽  
Water Types ◽  
Lake Võrtsjärv ◽  
Level 2 ◽  
Sentinel 2

Inland waters play a critical role in our drinking water supply. Additionally, they areimportant providers of food and recreation possibilities. Inland waters are known to be opticallycomplex and more diverse than marine or ocean waters. The optical properties of natural waters areinfluenced by three different and independent sources: phytoplankton, suspended matter, andcolored dissolved organic matter. Thus, the remote sensing of these waters is more challenging.Different types of waters need different approaches to obtain correct water quality products;therefore, the first step in remote sensing of lakes should be the classification of the water types. Theclassification of optical water types (OWTs) is based on the differences in the reflectance spectra ofthe lake water. This classification groups lake and coastal waters into five optical classes: Clear,Moderate, Turbid, Very Turbid, and Brown. We studied the OWTs in three different Latvian lakes:Burtnieks, Lubans, and Razna, and in a large Estonian lake, Lake Võrtsjärv. The primary goal of thisstudy was a comparison of two different Copernicus optical instrument data for opticalclassification in lakes: Ocean and Land Color Instrument (OLCI) on Sentinel-3 and MultispectralInstrument (MSI) on Sentinel-2. We found that both satellite OWT classifications in lakes werecomparable (R2 = 0.74). We were also able to study the spatial and temporal changes in the OWTs ofthe study lakes during 2017. The comparison between two satellites was carried out to understandif the classification of the OWTs with both satellites is compatible. Our results could give us not onlya better overview of the changes in the lake water by studying the temporal and spatial variabilityof the OWTs, but also possibly better retrieval of Level 2 satellite products when using OWT guidedapproach.

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