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Hassan, Syed Zahid,Cheon, Hyung Jin,Choi, Changwon,Yoon, Seongwon,Kang, Mingyun,Cho, Jangwhan,Jang, Yun Hee,Kwon, Soon-Ki,Chung, Dae Sung,Kim, Yun-Hi American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.31
<P>Herein, we explore the strategy of realizing a red-selective thin-film organic photodiode (OPD) by synthesizing a new copolymer with a highly selective red-absorption feature. PCZ-Th-DPP, with phenanthrocarbazole (PCZ) and diketopyrrolopyrrole (DPP) as donor and acceptor units, respectively, was strategically designed/synthesized based on a time-dependent density functional theory calculation, which predicted the significant suppression of the band II absorption of PCZ-Th-DPP due to the extremely efficient intramolecular charge transfer. We demonstrate that the synthesized PCZ-Th-DPP exhibits not only a high absorption coefficient within the red-selective band I region, as theoretically predicted, but also a preferential face-on intermolecular structure in the thin-film state, which is beneficial for vertical charge extraction as an outcome of a glancing incidence X-ray diffraction study. By employing PCZ-Th-DPP as a photoactive layer of Schottky OPD, to fully match its absorption characteristic to the spectral response of the red-selective OPD, we demonstrate a genuine red-selective specific detectivity in the order of 10<SUP>12</SUP> Jones while maintaining a thin active layer thickness of ∼300 nm. This work demonstrates the possibility of realizing a full color image sensor with a synthetic approach to the constituting active layers without optical manipulation.</P> [FIG OMISSION]</BR>
Hassan, Md Zahid,Robin, Arif Hasan Khan,Rahim, Md Abdur,Natarajan, Sathishkumar,Kim, Hoy-Taek,Park, Jong-In,Nou, Ill-Sup The Korean Society of Plant Biotechnology 2018 식물생명공학회지 Vol.45 No.3
Gummy stem blight (GSB) is one of the most destructive and economically important, soil borne diseases of melon caused by the ascomycete fungus, Didymella bryoniae throughout the world. In Korea, however, no GSB resistant genotype has been reported yet. The study aimed to identify GSB resistant melon germplasm. We screened a total of 60 genotypes including 16 lines and 44 melon cultivars collected from USA and Korea. Among the 16 melon lines, four lines including 'PI482399', 'PI140471', 'PI136170' and 'PI420145', and two Korean cultivars viz. 'Asia Papaya' and 'Supra' showed complete resistance. We were aware that both genotypic and environmental variations could influence the phenotypic screening of resistance and susceptibility. We therefore, further assessed all genotypes using 20 SSR markers. The SSR marker 'CMCT505' linked to Gsb1 in chromosome 1 perfectly grouped resistant and susceptible lines indicating that resistance is probably due to the presence of Gsb1 gene. Cloning and sequencing of resistant and susceptible Gsb1 amplicons showed that there were 32-bp deletions in resistant line and 39-bp deletions in resistant cultivar compared to susceptible one. Thus, the resistant melon lines and cultivars identified in this study could be recommended for the melon breeding program. Furthermore, the SSR marker 'CMCT505' which is tightly linked with Gsb1 could be used for molecular screening of melon germplasm.
Hassan, Syed Tauseef,Danish, Danish,khan, Salah-Ud-Din,Baloch, Muhammad Awais,Tarar, Zahid Hassan Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.12
Looking at the recent studies, nuclear energy and carbon dioxide (CO<sub>2</sub>) emissions nexus shows inconclusive result. To further explain nuclear energy-pollution nexuses this study is an attempt to analyze the impact of nuclear energy on pollution reduction for BRICS countries covering data for the period from 1993 to 2017. This study conducts advanced panel techniques such as Continuously-Updated Fully-Modified (CUP-FM) and Continuously-Updated Bias-Corrected (CUP-BC) for long run estimation. Our results support the notion that nuclear energy reduce CO<sub>2</sub> emissions. Also, renewable energy corrects environmental pollution in BRICS countries. The magnitude of the coefficient of nuclear energy is less as compared to renewable energy, implying that nuclear is less effective in reducing environmental pollution. The findings offer significant policy understandings and suggestions not only for BRICS economies but for developing countries as well in designing suitable nuclear energy-growth-carbon policies.
Md Zahid Hassan,Arif Hasan Khan Robin,Md Abdur Rahim,Sathishkumar Natarajan,김효택,박종인,노일섭 한국식물생명공학회 2018 JOURNAL OF PLANT BIOTECHNOLOGY Vol.45 No.3
Gummy stem blight (GSB) is one of the most destructive and economically important, soil borne diseases of melon caused by the ascomycete fungus, Didymella bryoniae throughout the world. In Korea, however, no GSB resistant genotype has been reported yet. The study aimed to identify GSB resistant melon germplasm. We screened a total of 60 genotypes including 16 lines and 44 melon cultivars collected from USA and Korea. Among the 16 melon lines, four lines including ‘PI482399’, ‘PI140471’, ‘PI136170’ and ‘PI420145’, and two Korean cultivars viz. ‘Asia Papaya’ and ‘Supra’ showed complete resistance. We were aware that both genotypic and environmental variations could influence the phenotypic screening of resistance and susceptibility. We therefore, further assessed all genotypes using 20 SSR markers. The SSR marker ‘CMCT505’ linked to Gsb1 in chromosome 1 perfectly grouped resistant and susceptible lines indicating that resistance is probably due to the presence of Gsb1 gene. Cloning and sequencing of resistant and susceptible Gsb1 amplicons showed that there were 32-bp deletions in resistant line and 39-bp deletions in resistant cultivar compared to susceptible one. Thus, the resistant melon lines and cultivars identified in this study could be recommended for the melon breeding program. Furthermore, the SSR marker ‘CMCT505’ which is tightly linked with Gsb1 could be used for molecular screening of melon germplasm.
End-Group Alkylation of Diarylethene to Enhance Photo-Switchability of Organic Transistors
Syed Zahid Hassan,유성훈,소찬,문도현,정대성 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
A molecular and synthetic approach to strengthen switching performance of diarylethene (DAE)-based organic transistor is proposed. From photophysical, structural and morphological analyses, we found that longer alkyl chains inhibit intermolecular aggregation between DAEs and allow more hydrophobic surface property of DAEs, thus improving molecular miscibility with ITIC. In addition, it is found that the improved molecular compatibility of DAEs with ITIC makes the overall bulk heterojunction (BHJ) film amorphous, allowing more free volume for reversible photoisomerization. As a result, DAE_C6 exhibits the maximum quantum yield for both photocyclization and photocycloreversion, enabling high light-controlled on/off ratios when employed as a photoswitch of ITIC transistor. Furthermore, exceptionally high quantum yield of DAE_C6 enables robust fatigue resistance under repeated photoswitching of the transistor with only 30% decrease of on/off ratio after 100 cycles.
Hassan AL-Alawi,Saad Al-Nazhan,Nassr Al-Maflehi,Mazen A. Aldosimani,Mohammed Nabil Zahid,Ghadeer N. Shihabi 대한치과보존학회 2020 Restorative Dentistry & Endodontics Vol.45 No.1
Objectives: The purpose of this study was to determine the incidence of radix molaris (RM) (entomolaris and paramolaris) in the mandibular first permanent molars of a sample Saudi Arabian subpopulation using cone-beam computed tomography (CBCT). Materials and Methods: A total of 884 CBCT images of 427 male and 457 female Saudi citizens (age 16 to 70 years) were collected from the radiology department archives of 4 dental centers. A total of 450 CBCT images of 741 mature mandibular first molars that met the inclusion criteria were reviewed. The images were viewed at high resolution by 3 examiners and were analyzed with Planmeca Romexis software (version 5.2). Results: Thirty-three (4.5%) mandibular first permanent molars had RM, mostly on the distal side. The incidence of radix entomolaris (EM) was 4.3%, while that of radix paramolaris was 0.3%. The RM roots had one canal and occurred more unilaterally. No significant difference in root configuration was found between males and females (p > 0.05). Types I and III EM root canal configurations were most common, while type B was the only RP configuration observed. Conclusions: The incidence of RM in the mandibular first molars of this Saudi subpopulation was 4.5%. Identification of the supernumerary root can avoid missing the canal associated with the root during root canal treatment.