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Mask On, Mask Off: Subclinical Parkinson’s Disease Unveiled by COVID-19
Milan Beckers 대한파킨슨병및이상운동질환학회 2023 Journal Of Movement Disorders Vol.16 No.1
Since early in the coronavirus disease (COVID-19) pandemic, the neuroinvasive potential of the SARS-CoV-2 virus has been recognized. Common neurological complaints experienced during COVID-19 are headache, dizziness, hyposmia and hypogeusia. The latter symptoms are thought to originate from viral invasion of the olfactory bulb via angiotensin-converting enzyme 2 (ACE2) receptors
Local Structure Invariant Potential for InxGa1-xAs Semiconductor Alloys
심은지,Minwoo Han,Joost Beckers,Simon de Leeuw 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.4
We model lattice-mismatched group III-V semiconductor InxGa1-xAs alloys with the three-parameter anharmonic Kirkwood-Keating potential, which includes realistic distortion effect by introducing anharmonicity. Although the potential parameters were determined based on optical properties of the binary parent alloys InAs and GaAs, simulated dielectric functions, reflectance, and Raman spectra of alloys agree excellently with experimental data for any arbitrary atomic composition. For a wide range of atomic composition, InAs- and GaAs-bond retain their respective properties of binary parent crystals despite lattice and charge mismatch. It implies that use of the anharmonic Kirkwood-Keating potential may provide an optimal model system to investigate diverse and unique optical properties of quantum dot heterostructures by circumventing potential parameter searches for particular local structures.
Local Structure Invariant Potential for In<sub>x</sub>Ga<sub>1-x</sub>As Semiconductor Alloys
Sim, Eun-Ji,Han, Min-Woo,Beckers, Joost,De Leeuw, Simon Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.4
We model lattice-mismatched group III-V semiconductor $In_{x}Ga_{1-x}$ alloys with the three-parameter anharmonic Kirkwood-Keating potential, which includes realistic distortion effect by introducing anharmonicity. Although the potential parameters were determined based on optical properties of the binary parent alloys InAs and GaAs, simulated dielectric functions, reflectance, and Raman spectra of alloys agree excellently with experimental data for any arbitrary atomic composition. For a wide range of atomic composition, InAs- and GaAs-bond retain their respective properties of binary parent crystals despite lattice and charge mismatch. It implies that use of the anharmonic Kirkwood-Keating potential may provide an optimal model system to investigate diverse and unique optical properties of quantum dot heterostructures by circumventing potential parameter searches for particular local structures.
독일 상트 오틸리엔 선교분도수도원 선교박물관 소장 갑옷에 관한 기초연구
조우현(Woo Hyun Cho),염정하(Jung Ha Yum),BeckersKim영자(Young Ja Beckers Kim) 한국복식학회 2015 服飾 Vol.65 No.3
This is a basic study of the two remaining armors (artifacts number K2366, K2368) from the late Joseon dynasty that is part of the Korean costume collection, which is preserved in the Mission Museum of Saint Ottilien in Germany. The armor No. 1 (artifacts number K2366) is a coat-styled armor with brass studs. It has a U-shaped neckline with the non-overlapping collars and sleeve straight-lined inseam. The armor No. 1 has the Mu to the sides and is not back slit. Both its inner and outer material are padded with cotton. Leather mails are attached on the inner lining, and studs are attached on the outer lining to match the leather mails. For this reason, the armor No. 1 can be named MyeonPiGab (brass studded armor consisting of a cotton coat with internal leather mails). The outer material is faded to have the natural white, or antique white look and the patterns on it are indigo blue. The inner material is blue, but the original color is unknown since it is faded. The lotus blossoms and vine patterns are dyed on the surface of the outer material and a name is written on the inner material. The armor No. 1 was worn between the late 17th century and the 19th century. It is estimated that it was worn by military officers who were above the mid-rank in the end of the Joseon dynasty. The armor No. 2 (artifacts number K2368) is a coat-styled armor with brass studs and a low-cut U-shaped neckline. The armor No. 2 has a slit on the left armpit and a string around it. Studs are evenly attached on the armor. The iron mails are attached to the left chest area on its inner lining. It seems that it was designed with both formality and functionality in mind. The outer material is red flannel, the inner material is blue satin and the pads are cheesecloth. The side of its collars, cuffs, front lines, sidelines, back slit, and bottom lines are trimmed with fur. There are armors called “JeonCheolGap (brass studded armor consisting of a felt coat with internal iron mails),” which is similar to the armor No. 2, however, the similarities are limited because they are not made of the same material nor do they follow the same principle of nomenclature.
Pine sawdust biomass and biochars at different pyrolysis temperatures change soil redox processes
Awad, Yasser Mahmoud,Ok, Yong Sik,Abrigata, Jens,Beiyuan, Jingzi,Beckers, Felix,Tsang, Daniel C.W.,Rinklebe, Jö,rg Elsevier BV 2018 Science of the Total Environment Vol. No.
<P><B>Abstract</B></P> <P>To date, no investigation has been carried out to explore the effects of biochars produced at different pyrolysis temperatures on the dynamics of redox potential (<I>E</I> <SUB>H</SUB>) and pH in a contaminated floodplain soil. Thus, we aimed to quantify the dynamics of <I>E</I> <SUB>H</SUB> and pH in contaminated flooded soils treated with 70tha<SUP>−1</SUP> of pine sawdust biomass (S&BM) and biochars pyrolyzed at 300°C (S&BC300) and 550°C (S&BC550) and pre-incubated for 105days in an automated biogeochemical microcosm system. Microbial community composition was also determined via analyzing phospholipid fatty acid (PLFA).We found that BC300 and BC550 treatments substantially decreased (3–6.5%) and BM increased (~37%) the mean of soil <I>E</I> <SUB>H</SUB> compared to the untreated contaminated soil (CS).·The largest <I>E</I> <SUB>H</SUB> decline in S&BC550 was at the rate of −80mVh<SUP>−1</SUP> at 10h while it was observed at 25h in S&BC300 and 20–25h in S&BM or CS, respectively. At high <I>E</I> <SUB>H</SUB>, a higher total PLFA biomass and microbial groups in the CS (71–87%) were found in comparison to treated soils. Higher aromaticity and ash content in BC550 than BC300 and BM led to the greater PLFA biomass and microbial groups which contributed to higher capacity of accepting and donating electrons in soil slurry and were probably one reason for the largest decrease in <I>E</I> <SUB>H</SUB>. Pine sawdust biomass and BCs have a noticeable influence in soil biogeochemical processes relevant to fluctuating redox conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> First study of the effects of biochars on soil redox potential (<I>E</I> <SUB>H</SUB>) and pH </LI> <LI> The most rapid <I>E</I> <SUB>H</SUB> change per hour was in soil treated with biochar made at 550°C. </LI> <LI> This <I>E</I> <SUB>H</SUB> decline occurs after 10h during the redox experiment. </LI> <LI> The second rapid <I>E</I> <SUB>H</SUB> change was found in soil treated with pine sawdust biomass. </LI> <LI> At low <I>E</I> <SUB>H</SUB>, biochar made at 550°C increased PLFA biomass compared to untreated soil. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>