1945 년 이후의 소리시

미하엘렌츠 서울대학교 독일학연구소 2000 독일어문화권연구 Vol.9 No.-

Low-Salinity Liquid-Rich Or Vapor-Like Fluids In A Porphyry-Type Mo Deposit, South Korea

Kim, Hyungsuk,Yang, Kyounghee,Lentz, David,Jeong, Hoon-Young,Kil, Youngwoo,Hwang, Jinyeon,Park, Sam-Gye The Mineralogical Association of Canada 2016 The Canadian mineralogist Vol.54 No.3

<P>Small porphyry-type molybdenum (Mo) mineralization, the Geumeum deposit in the Gyeongsang Basin, South Korea, is associated with the crystallization of a Cretaceous granodiorite, exsolution of magmatic hydrothermal fluids, and related hydrofracturing. Quartz and molybdenite occur with minor amounts of uneconomic chalcopyrite, pyrite, sphalerite, and galena that precipitated from exsolved magmatic fluids and formed hydrothermal fissure-filling vein ores. Three distinct fluid inclusion assemblages responsible for the precipitation of molybdenite are present in the vein quartz. The earliest fluid is represented by low-salinity liquid-rich Type I fluid inclusions, which displayed homogenization temperatures ranging from 298 to 352 °C, and salinities from ∼0 to 9 wt.<I></I>% NaCl equiv. The Type I inclusions were trapped in a liquid-stable, vapor-absent, one-phase field. The intermediate fluid is represented by CO<SUB>2</SUB>-bearing vapor-rich Type IV inclusions, generally showing no visible CO<SUB>2</SUB> liquid phase. These CO<SUB>2</SUB>-bearing inclusions totally homogenized by vapor disappearance at 327∼340 °C or vapor bubble expansion at 327∼369 °C, exhibiting near-critical behaviors. The textural relationships and phase equilibria constraints indicate that the Type IV inclusions were derived from a single population, which formed as pressure and temperature fluctuated at near-critical conditions. The latest fluid can be represented by vapor-rich Type II fluid inclusions. No microthermometric data were obtained for these latest assemblages as no visible amounts of liquid phases are evident in small inclusions. Type III inclusions, which commonly refer to halite-bearing inclusions, are absent in the quartz veins studied. The oxygen and hydrogen isotopic fluid compositions of the vein quartz (<I></I>δ<SUP>18</SUP>O<SUB>SMOW</SUB> = 4.3 to 6.9‰ and <I></I>δD<SUB>SMOW</SUB> = −65 to −84‰ at 400 °C) is consistent with a magmatic origin with a possible slight influence from meteoric water. Molybdenum mineralization at Geumeum is a product of hypogene hydrothermal processes that were strongly fracture-controlled, highlighting the importance of low-salinity liquid-rich to vapor-like supercritical fluids for the mineralization. It seems likely that the magmas responsible for the formation of the deposit at Geumeum were emplaced at greater depths than those reported for economic porphyry copper deposits in the world. The deposit could thus have survived long periods of erosion, and represent the weakly mineralized “base” of porphyry systems in the Gyeongsang Basin, South Korea.</P>

Demographic Analysis of Lumbar Pedicle Diameters in a Diverse Population

Joseph Albano,Jonathon Lentz,Robert Stockton,Vincent DePalma,Michael Markowitz,Maximillian Ganz,Gus Katsigiorgis,Kanwarpaul Grewal 대한척추외과학회 2019 Asian Spine Journal Vol.13 No.3

Study Design: Retrospective chart review. Purpose: We sought to determine the differences in pedicle diameter (PD) in the lumbar spine between various races: ‘Asian,’ ‘Black,’ ‘White,’ and ‘Other.’ These data could aid in perioperative planning during instrumented spinal fusion. Overview of Literature: Recent literature underscores the importance of understanding diverse pedicle isthmus morphology to perform successful transpedicular procedures. These studies suggest that more detailed and reliable measurements of pedicles should be undertaken. However, none of the current literature comprehensively compares average PDs between diverse racial populations with a standardized study design. Methods: Coronal cuts of 5,060 lumbar spine pedicles were inspected to obtain their transverse outer cortical PD as measured through the isthmus at L1–L5. Data were collected and categorized on the basis of patient-reported race. We examined average PD and PD range at each level for each race. To determine the significance, we used a mixed analysis of variance and a post hoc analysis. Results: The Asian cohort consistently had a significantly smaller PD at L1–L5 than Blacks or Whites (p<0.001), as did the ‘Other’ group compared with Blacks (p<0.001) and Whites (p=0.032). At L1–L2, the ‘Other’ group showed the least variability in PD. At L3–L5, the Asian population showed the smallest range, and the Black population had the largest variability in PD except at L5. There was a significant difference in PD between the various races. Conclusions: The Asian population consistently has significantly smaller pedicles in the lumbar spine than the Black or White populations. This information could prove useful for surgical planning. We suggest using preoperative computed tomography for pedicle screw templating as a safe method for pedicle screw instrumentation with the highest pullout strength given the wide range of PD in the Black population and the variability of PD between races.

OPTIMIZATION OF INTENTIONAL MISTUNING PATTERNS FOR THE REDUCTION OF THE FORCED RESPONSE EFFECTS OF UNINTENTIONAL MISTUNING

Byeong-Keun Choi,Jeff Lentz,Alejandro Rivas-Guerra,Marc P. Mignolet 한국동력기계공학회 2002 한국동력기계공학회 학술대회 논문집 Vol.- No.-

Biobehavioral Health Research: A nursing study of women with and without fibromyalgia

Landis, Carol A.,Lentz, Martha J. The Research Institute of Nursing Science Seoul Na 2005 간호학의 지평 Vol.2 No.1

Biobehavioral nursing research is focused on generating knowledge that examines relations among biological, behavioral, and social dimensions of health to improve outcomes. In this paper we review the findings of a biobehavioral nursing study of individuals with fibromyalgia (FM) that was framed from the perspective of an individual human response model, the FM literature, and our previous studies in midlife women. We were particularly interested in the studying the role of 'arousal' secondary to pain or to dysregulated hypothalamic-pituitary-adrenal (HPA) axis hormones during sleep and the impact on symptom expression. Unexpectedly, we did not find evidence of, arousal' or abnormal amounts of HPA axis hormones but we did find reduced amounts of growth hormone (GH) and prolactin (PRL) and of sleep spindle activity, a biomarker of sleep maintenance. We discuss these new findings and how our thinking was re-shaped to better understand the role that disturbed sleep plays in symptom expression in FM. It is argued that disturbed sleep maintenance mechanisms coupled with dysregulated somatotrophic-growth hormone axis and sleep-related PRL render individuals vulnerable to the development of or exacerbations of FM symptoms.

Biobehavioral Health Research: A nursing study of women with and without fibromyalgia

( Carol A. Landis ),( Martha J. Lentz ) 서울대학교 간호과학연구소 2005 간호학의 지평 Vol.2 No.1

An Overview of Biopulping Research: Discovery and Engineering

Scott, Gary M.,Akhtar, Masood,Lentz, Michael J.,Horn, Eric,Swaney, Ross E.,Kirk, T.Kent Korea Technical Association of the Pulp and Paper 1998 펄프.종이기술 Vol.30 No.4

Biopulping is defined as the treatment of wood chips with lignin-degrading fungi prior to pulping. Fungal pretreatment prior to mechanical pulping reduces electrical energy requirements during refining or increases mill throughput, improves paper strength, reduces the pitch content, and reduces the environmental impact of pulping. Our recent work involved scaling up the biopulping process towards the industrial level, investigating both the engineering and economic feasibility. We envision the process to be done in either a chip-pile or silo-based system for which several factors need to be considered: the degree of decontamination, a hospitable environment for the fungus, and the overall process economics. Currently, treatment of the chips with low-pressure steam is sufficient for decontamination and a simple, forced ventilation system maintains the proper temperature, humidity, and moisture conditions, thus promoting uniform growth of the fungus. The pilot-scale trial resulted in the successful treatment of 4 tons of wood chips (dry weight basis) with results comparable to those on a laboratory. Larger, 40-ton trials were also successful, with energy savings and paper properties comparable with the laboratory scale. The overall economics of the process also look very favorable and can result in significant annual savings to the mill. Although the current research has focused on biopulping for mechanical pulping, it is also beneficial for sulfite chemical pulping and some applications to recycled fiber have been investigated.

Review of Qualitative Approaches for the Construction Industry: Designing a Risk Management Toolbox

Zalk, David M.,Spee, Ton,Gillen, Matt,Lentz, Thomas J.,Garrod, Andrew,Evans, Paul,Swuste, Paul Occupational Safety and Health Research Institute 2011 Safety and health at work Vol.2 No.2

Objectives: This paper presents the framework and protocol design for a construction industry risk management toolbox. The construction industry needs a comprehensive, systematic approach to assess and control occupational risks. These risks span several professional health and safety disciplines, emphasized by multiple international occupational research agenda projects including: falls, electrocution, noise, silica, welding fumes, and musculoskeletal disorders. Yet, the International Social Security Association says, "whereas progress has been made in safety and health, the construction industry is still a high risk sector." Methods: Small- and medium-sized enterprises (SMEs) employ about 80% of the world's construction workers. In recent years a strategy for qualitative occupational risk management, known as Control Banding (CB) has gained international attention as a simplified approach for reducing work-related risks. CB groups hazards into stratified risk 'bands', identifying commensurate controls to reduce the level of risk and promote worker health and safety. We review these qualitative solutions-based approaches and identify strengths and weaknesses toward designing a simplified CB 'toolbox' approach for use by SMEs in construction trades. Results: This toolbox design proposal includes international input on multidisciplinary approaches for performing a qualitative risk assessment determining a risk 'band' for a given project. Risk bands are used to identify the appropriate level of training to oversee construction work, leading to commensurate and appropriate control methods to perform the work safely. Conclusion: The Construction Toolbox presents a review-generated format to harness multiple solutions-based national programs and publications for controlling construction-related risks with simplified approaches across the occupational safety, health and hygiene professions.

Implicit Contracts and Perform - ance Bonds : The Mentor - Protege Relationship in Legal Partnership

David N . Laband,Bernard F . Lentz 한양대학교 경제연구소 1997 JOURNAL OF ECONOMIC RESEARCH Vol.2 No.2

Activation Parameters for the Aquation Reaction of Trans-Dichlorobis(1,3Propanediamine)-Cobalt(III)-Chloride

Oh, Sang-Oh,Ro¨βling, Georg,Lentz, Harro 慶北大學校 物理化學硏究所 1984 硏究論文集 Vol.5 No.-

The hydrolysis of trans-[Co(pn)_2Cl_2]Cl has been studied between 30 and 60 C up to pressure of 2 kbar. Activation volumes and activation energies are reported. At 25 and 40 C and at 1 and 1000 bars activation parameters are compared with those of the hydrolysis of trans-[Co(pn)_2Cl_2]Cl.