scholarly journals Assessing the risks of pesticides to threatened and endangered species using population modeling: A critical review and recommendations for future work

2016 ◽  
Vol 35 (8) ◽  
pp. 1904-1913 ◽  
Author(s):  
Valery E. Forbes ◽  
Nika Galic ◽  
Amelie Schmolke ◽  
Janna Vavra ◽  
Rob Pastorok ◽  
...  
Keyword(s):  
Endangered Species ◽  
Critical Review ◽  
Population Modeling ◽  
Threatened And Endangered Species ◽  
Future Work

scholarly journals Threatened and Endangered Species Geography

BioScience ◽  
1998 ◽  
Vol 48 (5) ◽  
pp. 365-376 ◽  
Author(s):  
Curtis H. Flather ◽  
Michael S. Knowles ◽  
Iris A. Kendall
Keyword(s):  
Endangered Species ◽  
Threatened And Endangered Species

scholarly journals Costs of Biological and Cultural Resource Protection to the U.S. Natural Gas Industry

2020 ◽  
pp. 1-20
Author(s):  
Mitch Kunce
Keyword(s):  
Endangered Species ◽  
Natural Gas ◽  
Jel Classification ◽  
Cultural Resources ◽  
Private Lands ◽  
Gas Industry ◽  
Land Type ◽  
Threatened And Endangered Species ◽  
Natural Gas Industry ◽  
The U.S

Using a unique land transaction from the 1860s in the Western U.S., this paper examines whether the presence of biological and cultural resources on private and federal land increase drilling costs to the U.S. natural gas industry. Our results suggest that the presence of these resources can increase costs, but the effect depends on the land type and which resources are being protected. The presence of threatened and endangered species increase drilling costs significantly on both federal and private lands; whereas the existence of migratory wildlife like elk and pronghorn does not. Cultural resources have a differentiated impact-they raise drilling costs significantly on federal lands, but not on private lands. JEL classification numbers: C23, Q58. Keywords: Endangered Species, U.S. Natural Gas, Cultural Resources, Drilling Costs.

A critical review on automation of steering mechanism of load haul dump machine

2019 ◽  
Vol 234 (2) ◽  
pp. 160-182
Author(s):  
Sreeharsha Rowduru ◽  
Niranjan Kumar ◽  
Ajit Kumar
Keyword(s):  
Critical Review ◽  
Tracking Error ◽  
Steering System ◽  
Pictorial Representation ◽  
Research Gaps ◽  
Steering Mechanism ◽  
Different Types ◽  
Automatic Steering ◽  
Complete Automation ◽  
Future Work

This article presents a brief note on the evolution of steering mechanisms and more emphasized on articulated steering system of the load haul dump machine. In this respect, pictorial representation of the evolution of steering mechanisms for on-road and articulated steering mechanisms of the load haul dump machine is made from the available literature. Critical review on basic elements required for the complete automation of the load haul dump vehicle steering system is presented. Different types of controllers for path tracking error minimization of the scale-modeled or simulated model of the load haul dump steering system are tabulated. Few case studies stimulating the complete automation of the load haul dump steering system employed on the field are also discussed. Challenges and some research gaps in making fully automated steering system of the load haul dump machine are identified in this review article. At the end, based on the critical review, some novel methods for making the fully automated steering system of the load haul dump machine is provided, which is the potential future work for the design and development of feasible automatic steering system.

scholarly journals Orchids in Rolpa district of Western Nepal: Documentation, stock, trade and conservation

1970 ◽  
Vol 20 (2) ◽  
pp. 3-13 ◽  
Author(s):  
PN Koirala ◽  
D Pyakurel ◽  
K Gurung
Keyword(s):  
Endangered Species ◽  
Legal Protection ◽  
Systematic Research ◽  
Generic Level ◽  
Rare And Endangered Species ◽  
Wild Fauna ◽  
Threatened And Endangered Species ◽  
Rare And Endangered ◽  
Propagation Technique ◽  
Over Exploitation

Orchids are perennial, epiphytic, terrestrial or lithophytic herbs with roots having multilayered spongy tissues. In Nepal, 363 species of orchids are organized into 97 genera. Orchids fall under the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) Appendix II but do not fall under the legal protection of any existing national legislation. Habitat loss, forest destruction and degradation and over-exploitation have posed threats to the conservation of orchids in Nepal. The current study aims to document the orchids and estimate the stock of Dendrobium denudans and Dendrobium eriiflorum in a few potential locations of Rolpa district. A total of 36 species were documented in the surveyed 17 Village Development Committees (VDCs). Among them, 31 species were identified up to species level, two species up to generic level and the remaining three were unidentifed. The total stock of D. denudans was highest in Uwa VDC with 11018.08 kg followed by Seram VDC with the stock of 9982.57 kg. Similarly, D. eriiflorum stock in Seram, Siuri and Jaimakasala VDCs were 22750.01 kg, 7039.67 kg and 4933.46 kg, respectively. This study recommends a systematic research on the propagation technique; complete indexing of orchids; and inclusion of orchids in the Red Data Book on the threatened and endangered species. Orchid reserves in orchid hotspots should be established for the preservation and promotion of regeneration activities. The rare and endangered species should be preserved in botanic gardens. In addition to scientific attempts, the country should launch and implement a very firm regulation for their protection. Key words: Orchids; Dendrobium denudans; Dendrobium eriiflorum; distribution; conservation; Rolpa district DOI: 10.3126/banko.v20i2.4796 Banko Janakari Vol.20(2) 2010 pp.3-13

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