scholarly journals Lineament Length and Density Analyses Based on the Segment Tracing Algorithm: A Case Study of the Gaosong Field in Gejiu Tin Mine, China

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Chunzhong Ni ◽  
Shitao Zhang ◽  
Chunxue Liu ◽  
Yongfeng Yan ◽  
Yujian Li
Keyword(s):  
Early Stage ◽  
Mineral Exploration ◽  
Mining Area ◽  
Minimum Length ◽  
Contour Map ◽  
New Approach ◽  
Production Area ◽  
Tracing Algorithm ◽  
Ore Block

This study used the Segment Tracing Algorithm (STA) to extract lineaments from remotely sensed images. A computer program was then written to calculate the lineament densities and lengths. In Gaosong field, 3,233 lineaments were extracted based on a 200 m × 200 m grid size. The results indicate that most lineaments lengths are between 30 m and 50 m, and the number of lineaments within each cell ranges from 1 to 6. Areas with high distributions exist on both sides of the central region. According to the contour map of lineament length, the maximum lineament length is 380 m, and the minimum length is 30 m. The contours mainly extend in two directions, including NE and NW trends. This is consistent with the prominent NE and NW strike faults that prevail in the mining area. The results are similar to those obtained in the Machishui ore block, which has become a mine production area. High values of lineament length and density in the contour map of Gaosong field may be associated with hydrothermal tin mineralization in the study area. The results of this study potentially provide a new approach to mineral exploration in the early stage of geological prospecting.

scholarly journals Shifting Cases: Advancing a New Artifact for Entrepreneurial Education

2019 ◽  
Vol 8 (2) ◽  
pp. 211-227
Author(s):  
Marlo Rencher
Keyword(s):  
Early Stage ◽  
Safety Net ◽  
Boundary Object ◽  
Entrepreneurial Activity ◽  
Entrepreneurial Education ◽  
New Approach ◽  
Making Sense ◽  
Midwestern University ◽  
Dynamic Case

Entrepreneurship, as applied here, involves helping students develop an entrepreneurial mindset by working in a university-supported startup that lacks the artificiality of a simulation or the safety net of heavy financial subsidization. This article chronicles an organizational-wide change at a private Midwestern university and the development of a new “artifact”—the dynamic case study—to complement a new approach to business and entrepreneurial education. After reviewing the function of case studies in a teaching and research context, I consider this new kind of case study as a boundary object and means for making sense of early stage entrepreneurial activity.

scholarly journals Multitargeting for biological control of sleeper weeds

2008 ◽  
Vol 61 ◽  
pp. 396-396
Author(s):  
R. Groenteman ◽  
D. Kelly ◽  
S.V. Fowler
Keyword(s):  
Biological Control ◽  
Early Stage ◽  
Vascular Plant ◽  
Strong Support ◽  
Weed Species ◽  
Invasive Potential ◽  
New Approach ◽  
Native Flora ◽  
Rhinocyllus Conicus

Sleeper weeds are weeds at the early stage of invasion exotic species that have become naturalised and are highly likely to turn invasive in due course New Zealand has more naturalised exotic vascular plant species than natives many of which are considered sleeper weeds Biological control is more likely to succeed on weeds that have not yet fulfilled their invasive potential hence its significance in management of sleeper weeds Multitargeting is suggested here as a new approach for safe and effective management of multiple closely related invasive and sleeper weed species from groups not represented in the native flora using agents with a relatively wide host range While specifically targeting an invasive species in the group such agents could prevent closely related sleeper weeds from becoming a problem in the first place Thistles were used as a case study and strong support was found for the multitargeting approach Thus three nontarget less preferred thistle species were attacked and damaged by the biocontrol agent Rhinocyllus conicus more in the presence of its preferred host Carduus nutans (nodding thistle) than in its absence both in a field experiment and in a field survey

scholarly journals Indoor Building Reconstruction from Occluded Point Clouds Using Graph-Cut and Ray-Tracing

2018 ◽  
Vol 8 (9) ◽  
pp. 1529 ◽  
Author(s):  
Mattia Previtali ◽  
Lucía Díaz-Vilariño ◽  
Marco Scaioni
Keyword(s):  
Ray Tracing ◽  
Early Stage ◽  
Laser Scanner ◽  
Point Clouds ◽  
Outdoor Scenes ◽  
Complex Building ◽  
Tracing Algorithm ◽  
Increasing Demand ◽  
Indoor Reconstruction

Despite the increasing demand of updated and detailed indoor models, indoor reconstruction from point clouds is still in an early stage in comparison with the reconstruction of outdoor scenes. Specific challenges are related to the complex building layouts and the high presence of elements such as pieces of furniture causing clutter and occlusions. This work proposes an automatic method for modelling Manhattan-World indoors acquired with a mobile laser scanner in the presence of highly occluded walls. The core of the methodology is the transformation of indoor reconstruction into a labelling problem of structural cells in a 2D floor plan. Assuming the prevalence of orthogonal intersections between walls, indoor completion is formulated as an energy minimization problem using graph cuts. Doors and windows are detected from occlusions by implementing a ray-tracing algorithm. The methodology is tested in a real case study. Except for one window partially covered by a curtain, all building elements were successfully reconstructed.

A Proof for the Possibility of Ce-Oxide from CMP Residuals in Si-Wafers by Analytical TEM

2012 ◽  
Author(s):  
Wayne Zhao ◽  
Liem Do Thanh ◽  
Michael Gribelyuk ◽  
Mary-Ann Zaitz ◽  
Wing Lai
Keyword(s):  
Technology Development ◽  
Early Stage ◽  
Chemical Mechanical Planarization ◽  
Particle Cluster ◽  
Limited Region ◽  
Physical Evidence ◽  
Analytical Tem ◽  
Transmission Electron ◽  
Oxide Particles

Abstract Inclusion of cerium (Ce) oxide particles as an abrasive into chemical mechanical planarization (CMP) slurries has become popular for wafer fabs below the 45nm technology node due to better polishing quality and improved CMP selectivity. Transmission electron microscopy (TEM) has difficulties finding and identifying Ce-oxide residuals due to the limited region of analysis unless dedicated efforts to search for them are employed. This article presents a case study that proved the concept in which physical evidence of Ce-rich particles was directly identified by analytical TEM during a CMP tool qualification in the early stage of 20nm node technology development. This justifies the need to setup in-fab monitoring for trace amounts of CMP residuals in Si-based wafer foundries. The fact that Cr resided right above the Ce-O particle cluster, further proved that the Ce-O particles were from the wafer and not introduced during the sample preparation.

scholarly journals The Problem of Carbon Dioxide Emissions from Closed Coal Mine Shafts – The Overview and the Case Study

2016 ◽  
Vol 61 (3) ◽  
pp. 587-600
Author(s):  
Paweł Wrona ◽  
Józef Sułkowski ◽  
Zenon Różański ◽  
Grzegorz Pach
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Emissions ◽  
Carbon Dioxide Emission ◽  
Mining Area ◽  
Emission Point ◽  
Water Pumping ◽  
Gas Hazard ◽  
Flow Through ◽  
Reporting Procedures

Abstract Greenhouse gas emissions are a common problem noticed in every mining area just after mine closures. However, there could be a significant local gas hazard for people with continuous (but variable) emission of these gases into the atmosphere. In the Upper Silesia area, there are 24 shafts left for water pumping purposes and gases can flow through them hydraulically. One of them – Gliwice II shaft – was selected for inspection. Carbon dioxide emission with no methane was detected here. Changes in emission and concentration of carbon dioxide around the shaft was the aim of research carried out. It was stated that a selected shaft can create two kinds of gas problems. The first relates to CO2 emission into the atmosphere. Possible emission of that gas during one minute was estimated at 5,11 kg CO2/min. The second problem refers to the local hazard at the surface. The emission was detected within a radius of 8m from the emission point at the level 1m above the ground. These kinds of matters should be subject to regular gas monitoring and reporting procedures.

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