http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Baikie, Tom (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
Phase Transitions of Formamidinium Lead Iodide Perovskite under Pressure
Jiang, Shaojie,Luan, Yiliang,Jang, Joon I.,Baikie, Tom,Huang, Xin,Li, Ruipeng,Saouma, Felix O.,Wang, Zhongwu,White, Timothy J.,Fang, Jiye American Chemical Society 2018 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.140 No.42
<P>The pressure-induced structural evolution of formamidinium-based perovskite FAPbI<SUB>3</SUB> was investigated using <I>in situ</I> synchrotron X-ray diffraction and laser-excited photoluminescence methods. Cubic α-FAPbI<SUB>3</SUB> (<I>Pm</I>3̅<I>m</I>) partially and irreversibly transformed to hexagonal δ-FAPbI<SUB>3</SUB> (<I>P</I>6<SUB>3</SUB><I>mc</I>) at a pressure less than 0.1 GPa. Structural transitions of α-FAPbI<SUB>3</SUB> followed the sequence of <I>Pm</I>3̅<I>m</I> → <I>P</I>4/<I>mbm</I> → <I>Im</I>3̅ → partial amorphous during compression to 6.59 GPa, whereas the δ-phase converted to an orthorhombic <I>Cmc</I>2<SUB>1</SUB> structure between 1.26 and 1.73 GPa. During decompression, FAPbI<SUB>3</SUB> recovered the <I>P</I>6<SUB>3</SUB><I>mc</I> structure of the δ-phase as a minor component (∼18 wt %) from 2.41-1.40 GPa and the <I>Pm</I>3̅<I>m</I> structure of the α-phase becomes dominant (∼82 wt %) at 0.10 GPa but with an increased fraction of δ-FAPbI<SUB>3</SUB>. The photoluminescence behaviors from both the α- and δ-forms were likely controlled by radiative recombination at the defect levels rather than band-edge emission during pressure cycling. FAPbI<SUB>3</SUB> polymorphism is exquisitely sensitive to pressure. While modest pressures can engineer FAPbI<SUB>3</SUB>-based photovoltaic devices, irreversible δ-phase crystallization may be a limiting factor and should be taken into account.</P> [FIG OMISSION]</BR>
-
Estimation of the Gastric Cancer Incidence in Tehran by Two-Source Capture-recapture
Aghaei, Abbas,Ahmadi-Jouibari, Toraj,Baiki, Omid,Mosavi-Jarrahi, Alireza Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.2
Introduction: Capture-recapture methods have been suggested for reducing costs of disease registration as well as reducing bias in incidence estimations. This study aimed to estimate the gastric cancer incidence in the Tehran metropolis population during 2002-2006. Materials and Methods: We investigated new cases of gastric cancer reported by three sources; death certificates, pathology reports, and medical records to Tehran population-based cancer registry during 2002-2006. $G^2$ statistics and the two-source capture-recapture method were used to select the best-fitted log-linear model and to estimate incidence, respectively. EXCEL software version 2007 and SPSS software version 16 were used for this research. Results: The number of reported cases was 4,463, with an average age of 68.5 (${\pm}12.9$) years. We found the model that combined two sources of data including pathology reports and medical records and furthermore complemented by death certificates as the best model. The reported and the estimated incidences were 11.0 and 27.1 per 100,000 respectively. Conclusions: The incidence estimated by two-source capture-recapture method is about three times higher than the incidence reported by the sources under investigation. It is recommended to move towards the implementation of population-based cancer registration using various sources of data collection to achieve more accurate data.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
