Results 21 to 30 of about 264,579 (261)

A Variable-Dimension Overtube for Natural Orifice Transluminal Endoscopic Surgery

IEEE Access, 2020
In natural orifice transluminal endoscopic surgery, the insertion of surgical instruments can cause patient discomfort, even bleeding and perforation. This paper proposes a design of an overtube which can vary its radial dimension.
Yuyang Sun, Hongbin Liu, Shuxin Wang, Junghwan Back, Siyang Zuo, Julius E. Bernth, Guokai Zhang, Guohui Wang, Jianmin Li   +8 more
doaj   +1 more source

New methods for assessing the fascinating nature of nature experiences. [PDF]

PLoS ONE, 2013
In recent years, numerous environmental psychology studies have demonstrated that contact with nature as opposed to urban settings can improve an individual's mood, can lead to increased levels of vitality, and can offer an opportunity to recover from ...
Yannick Joye, Roos Pals, Linda Steg, Ben Lewis Evans   +3 more
doaj   +1 more source

Study on the influence of natural cracks on the mechanical properties and fracture mode for shale at the microscale: An example from the Lower Cambrian Niutitang Formation in northern Guizhou

Frontiers in Earth Science, 2023
A large number of natural cracks exist in shale reservoirs, and the presence of natural cracks weakens the integrity of shale, which is an important factor governing the effectiveness of shale gas extraction. In this paper, shales from the Lower Cambrian
Chao Yang, Zhonghu Wu, Wentang Wang, Heng Qu, Nuo Ren, Hai Li   +5 more
doaj   +1 more source

SUSTAINABLE MANAGEMENT OF COASTAL RESOURCES IN MENTAWAI ISLANDS DISTRICT, WEST SUMATRA PROVINCE, INDONESIA [PDF]

Geo Journal of Tourism and Geosites, 2023
This study aims to analyze the level of sustainability of coastal resources in the Mentawai Islands District. As an area that has various potential resources. Many developments in coastal areas are essential means of regional economic growth.
Achmad RIZAL, Suhendar I. SACHOEMAR, Ratu Siti ALIAH, HARYANTI, Joko Prayitno SUSANTO, MUHAMI, Indrati SUKMADI   +6 more
doaj   +1 more source

Fractal Dimension of Coastal Soil Aggregates and Its Relationship with Physical and Chemical Soil Properties

Guan'gai paishui xuebao, 2021
【Objective and objective】 Soil aggregate is a function unit commonly used to describe the impact of soil structure on soil fertility and quality. It is temporally dynamic, modulated by a myriad of biotic and abiotic factors such as wetting-drying cycles ...
HAN Xiao, SHE Dongli, WANG Hongde, ZHENG Yipeng   +3 more
doaj   +1 more source

Monitoring the Governance Dimension of Natural Resource Co-management

Ecology and Society, 2010
The governance outcomes of natural resource co-management have been neither systematically monitored nor rigorously assessed. We identified system attributes and key variables that could form the basis for monitoring the governance dimension of adaptive ...
Georgina Cundill, Christo Fabricius
doaj   +1 more source

Fractal dimension analogous scale-invariant derivative of Hirsch’s index

Applied Network Science, 2022
We propose a scale-invariant derivative of the h-index as “h-dimension”, which is analogous to the fractal dimension of the h-index for institutional performance analysis.
Yuji Fujita, Noritaka Usami
doaj   +1 more source

Fractal Features in Terrain Restoration of Jiuzhai Valley, a World Natural Heritage Site in China

Fractal and Fractional, 2023
Jiuzhai Valley, a World Natural Heritage Site, was significantly damaged by an earthquake in 2017. However, case studies on the restoration of World Natural Heritage sites are lacking.
Zan Zou, Yue Du, Huixing Song
doaj   +1 more source

Registro de un Águila Harpía (Harpia harpyja) en la Selva Lacandona, Chiapas, México

Huitzil
Existe escaso conocimiento del águila harpía (Harpia harpyja) en el norte de su distribución, siendo el ave rapaz y depredador tope más raro y amenazado.
Alan Monroy Ojeda, Santiago Gibert Isern, Román López Gómez, José de Jesús Vargas, Felix Hernan Vargas, Silvano López Gómez, Aurora Narváez Arcos   +6 more
doaj   +1 more source

Hurst Coefficient in long time series of population size: Model for two plant populations with different reproductive strategies

, 2010
Can the fractal dimension of fluctuations in population size be used to estimate extinction risk? The problem with estimating this fractal dimension is that the lengths of the time series are usually too short for conclusive results.
LUIS GARMENDIA, ALFONSO GARMENDIA, Garmendia Salvador, Luis, Garmendia Salvador, Alfonso, Salvador Alcaide, Adela, ADELA SALVADOR   +5 more
core   +1 more source