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RISS 인기검색어
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- 저자 : Hatherly, Peter (검색결과 6 건)
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Hatherly Peter,Medhurst Terry,Sliwa Renate,Turner Roland Korean Society of Earth and Exploration Geophysici 2005 지구물리와 물리탐사 Vol.8 No.1
물리검층은 석탄광 탐사에 일상적으로 적용된다. 현재 검층의 주요 적용 목적은 탄층의 심도 탐지와 탄질, 층서 및 암반강도의 정성적 추정이다. 그러나 만약 정량적 해석이 이루어진다면 더 많은 정보가 얻어질 수 있는데, 정량적 해석의 이해를 돕기 위해, 검층 반응을 Sydney Basin과 Bowen Basin의 호주산 검은 석탄(black coal) 광산지역에서 흔히 발견되는 쇄설퇴적암의 광물조성에 따라 논의하였으며, 검층 반응은 충분한 신뢰도로 광물조성에 대비될 수 있음을 알았다. 해석의 모호성은 만약 모든 종류의 검층자료가 있다면 더 잘 해결될 수 있을 것이다. 음파검층에서 측정된 속도와 계산값을 비교함으로써 일관성을 검토하는 방법 또한 서술하였다. 정량해석의 중요한 목적은 지질공학적 특성화이며, 이 논문에서는 물리검층으로부터 유추될 수 있는 물리적 성질을 고려한 쇄설암의 분류 시스템을 제안하였다.
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Seismic wave propagation through surface basalts - implications for coal seismic surveys
Sun, Weijia,Zhou, Binzhong,Hatherly, Peter,Fu, Li-Yun Korean Society of Earth and Exploration Geophysici 2010 지구물리와 물리탐사 Vol.13 No.1
Seismic reflection surveying is one of the most widely used and effective techniques for coal seam structure delineation and risk mitigation for underground longwall mining. However, the ability of the method can be compromised by the presence of volcanic cover. This problem arises within parts of the Bowen and Sydney Basins of Australia and seismic surveying can be unsuccessful. As a consequence, such areas are less attractive for coal mining. Techniques to improve the success of seismic surveying over basalt flows are needed. In this paper, we use elastic wave-equation-based forward modelling techniques to investigate the effects and characteristics of seismic wave propagation under different settings involving changes in basalt properties, its thickness, lateral extent, relative position to the shot position and various forms of inhomogeneity. The modelling results suggests that: 1) basalts with high impedance contrasts and multiple flows generate strong multiples and weak reflectors; 2) thin basalts have less effect than thick basalts; 3) partial basalt cover has less effect than full basalt cover; 4) low frequency seismic waves (especially at large offsets) have better penetration through the basalt than high frequency waves; and 5) the deeper the coal seams are below basalts of limited extent, the less influence the basalts will have on the wave propagation. In addition to providing insights into the issues that arise when seismic surveying under basalts, these observations suggest that careful management of seismic noise and the acquisition of long-offset seismic data with low-frequency geophones have the potential to improve the seismic results.
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Seismic wave propagation through surface basalts – implications for coal seismic surveys
Weijia Sun,Binzhong Zhou,Peter Hatherly,Li-Yun Fu 한국지구물리.물리탐사학회 2010 지구물리와 물리탐사 Vol.13 No.1
Seismic reflection surveying is one of the most widely used and effective techniques for coal seam structure delineation and risk mitigation for underground longwall mining. However, the ability of the method can be compromised by the presence of volcanic cover. This problem arises within parts of the Bowen and Sydney Basins of Australia and seismic surveying can be unsuccessful. As a consequence, such areas are less attractive for coal mining. Techniques to improve the success of seismic surveying over basalt flows are needed. In this paper, we use elastic wave-equation-based forward modelling techniques to investigate the effects and characteristics of seismic wave propagation under different settings involving changes in basalt properties, its thickness,lateral extent, relative position to the shot position and various forms of inhomogeneity. The modelling results suggests that:1) basalts with high impedance contrasts and multiple flows generate strong multiples and weak reflectors; 2) thin basalts have less effect than thick basalts; 3) partial basalt cover has less effect than full basalt cover; 4) low frequency seismic waves (especially at large offsets) have better penetration through the basalt than high frequency waves; and 5) the deeper the coal seams are below basalts of limited extent, the less influence the basalts will have on the wave propagation. In addition to providing insights into the issues that arise when seismic surveying under basalts, these observations suggest that careful management of seismic noise and the acquisition of long-offset seismic data with low-frequency geophones have the potential to improve the seismic results.
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( Toshifumi Hibi ),( Isao Kamae ),( Philippe Pinton ),( Lyann Ursos ),( Ryuichi Iwakiri ),( Greg Hather ),( Haridarshan Patel ) 대한장연구학회 2021 Intestinal Research Vol.19 No.1
Background/Aims: Several biologic therapies are approved in Japan to treat moderately to severely active ulcerative colitis (UC), but there are no published comparative efficacy studies in a Japanese population. We compared the efficacy of biologics approved in Japan (adalimumab, infliximab, golimumab, and vedolizumab) for treating biologic-naïve patients with UC at their approved doses. Methods: A targeted literature review identified 4 randomized controlled trials of biologics for UC in biologic-naïve Japanese patients. For each study, efficacy outcome data from induction (weeks 6-12) and maintenance (weeks 30-60) treatment were extracted for analysis. Treatment effects on clinical response, clinical remission, and mucosal healing relative to the average placebo results across all trials were estimated using network meta-analyses followed by transformation into probabilities and odds ratios (OR). Results: At the end of induction, the likelihood of clinical response and clinical remission was highest with infliximab (OR: 2.12 and 2.35, respectively) and vedolizumab (OR: 2.10 and 2.32, respectively); the likelihood of mucosal healing was highest with infliximab (OR: 2.24) and adalimumab (OR: 1.86). During maintenance, the likelihood of clinical response and clinical remission was highest with vedolizumab (OR: 6.44 and 4.68, respectively) and golimumab (OR: 5.13 and 3.84, respectively); the likelihood of mucosal healing was significantly higher than placebo with all biologics. Conclu sions: All active treatments were efficacious compared with placebo. Infliximab and vedolizumab had the highest odds for induction of clinical response, remission, and mucosal healing. Golimumab and vedolizumab had numerically higher odds of achieving efficacy outcomes in the maintenance phase. (Intest Res 2021;19:53-61)
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