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RISS 인기검색어
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- 저자 : Thomas H. Christensen (검색결과 4 건)
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폐기물 소각 잔류물의 매립 : 새로운 접근 방법에 대해
( Thomas H. Christensen ),( Thomas Astrup ),( Zuansi Cai ),( Dezhen Chen ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.2
폐기물 소각시설로부터의 잔류물은 대표적으로 바닥재와 비산재를 포함한 대기오염방지시설에서 나오는 잔류물이다. 이러한 재로부터 상당량의 중금속과 염이 용출되며, 다양한 용출실험을 통하여 비산재 및 바닥재의 매립 규제를 위한 기준이 제안 되어왔다. 그러나 실제 처분하는 현장과 동일하게 정보를 제공 및 매립하기 전에 잔류물들의 전처리의 이익평가를 하기 위해서 용출실험은 주의 깊게 선택 되어야만 한다. 본 논문은 매립된 잔류물에서의 pH-변화 및 Cr 용출능에 대한 용출실험의 영향과 FeSO<sub>4</sub> 를 이용한 전처리의 효과를 서술하였다. Residues from waste incineration are bottom ashes and air-pollution-control (APC) residues including fly ashes. The leaching of heavy metals and salts from the ashes is substantial and a wide spectrum of leaching tests and corresponding criteria have been introduced to regulate the landfilling of the ashes. Leaching test, however, must be selected carefully to provide information relevant for the actual disposal scenario and for evaluating the benefits of pre-treating the residues prior to landfilling. This paper describes research at the Technical University of Denmark addressing some of these issues focusing on pH-development in landfilled residues, effects of leaching test conditions on Cr leaching and effects of pre-treatment with FeSO<sub>4</sub>.
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LANDFILLING OF WASTE INCINERATION RESIDUES: TOWARDS NEW APPROACHES
( Thomas H. Christensen ),( Thomas Astrup ),( Zuansi Cai ),( Dezhen Chen ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.1
Residues from waste incineration are bottom ashes and air-pollution-control (APC) residues including fly ashes. The leaching of heavy metals and salts from the ashes is substantial and a wide spectrum of leaching tests and corresponding criteria have been introduced to regulate the landfilling of the ashes. Leaching test, however, must be selected carefully to provide information relevant for the actual disposal scenario and for evaluating the benefits of pre-treating the residues prior to landfilling. This paper describes research at the Technical University of Denmark addressing some of these issues focusing on pH-development in landfilled residues, effects of leaching test conditions on Cr leaching and effects of pre-treatment with FeSO<sub>4</sub>.
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Comparing Outcomes of Bicruciate-Stabilized and Cruciate-Retaining Total Knee Arthroplasty
Lorena Hernandez,Ittai Shichman,Thomas H. Christensen,Joshua C. Rozell,Morteza Meftah,Ran Schwarzkopf 대한정형외과학회 2024 Clinics in Orthopedic Surgery Vol.16 No.1
Background: Bicruciate-stabilized (BCS) total knee arthroplasty (TKA) aims to restore normal kinematics by replicating the function of both cruciate ligaments. Conventional cruciate-retaining (CR) design in TKA has shown previous clinical success with lower complication rates. This study compared the patient-reported outcomes between the BCS and CR TKA designs. Methods: This retrospective study examined patients who underwent primary TKA using a CR or a BCS implant. Patient demographics, Knee Injury and Osteoarthritis Outcome Score for Joint Replacement (KOOS, JR), and Forgotten Joint Score (FJS) were compared between two cohorts. Patient-reported outcome measures were analyzed using independent samples t -tests. Results: There were no significant preoperative demographic differences between groups. The CR cohort (n = 756) had significantly higher average KOOS, JR Scores compared to the BCS cohort (n = 652) at 3 months (59.7 ± 3.8 vs. 53.0 ± 3.9, p < 0.001) and 2 years (62.6 ± 8.0 vs. 53.8 ± 6.7, p = 0.001) after TKA. Within the cohort, KOOS, JR delta differences were not significant for CR when comparing patient scores 3 months to 1 year after surgery. Meanwhile, the BCS patients did show significant delta improvement (4.1 ± 1.9, p = 0.030) when compared 3 months to 1 year after surgery. One year postoperatively, the BCS cohort (n = 134) showed a significantly higher average FJS score (49.5 ± 31.4, vs. 36.8 ± 28.5, p = 0.028) than the CR cohort (n = 203). Both cohorts displayed a significant difference in delta improvements within their respective cohort when measuring FJS from 3 months to 1 year, 2 years, and 3 years after surgery. Conclusions: The CR cohort performed better on average, compared to the BCS cohort in measures of KOOS, JR scores at the 2-year follow-up. The BCS cohort performed marginally better regarding FJS only at 1-year follow-up.
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