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- 저자 : Ailian Liu (검색결과 2 건)
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Characteristics Analysis for Nanosoldering with Atomic Force Microscope
Zenglei Liu,Ailian Gao,Shuangxi Xie,Niandong Jiao,Lianqing Liu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.4
Field-emission deposition of atomic force microscope (AFM) can be used to fabricate nanopads, and therefore has potential applications in soldering nanodevices. However, the soldering effects are hard to verify because the soldering pads are of nanoscale. This paper studied the electrical, thermal and mechanical characteristics of the deposited nanopads, in order to testify the soldering effects. For this purpose, first, a carbon nanotube field effect transistor (CNTFET) was soldered to see whether the conductivity of the transistor was improved. Next, the thermal performance of the nanopads were observed by heating them in an oven. Last, the nanopads were mechanically pushed by an AFM probe to test the physical connection between the nanopads and the substrate. Experimental results showed that the nanosoldering dramatically reduced the contact resistance of the transistor. Moreover, the nanopads could withstand high temperature and mechanical push. Consequently, field-emission deposition of the AFM promised a bright future in nanosoldering.
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Guanfu Liu,Mengying Li,Guosheng Li,Zhiyong Li,Ailian Liu,Renwang Pu,Huizhi Cao,Yijun Liu 대한영상의학회 2018 Korean Journal of Radiology Vol.19 No.1
Objective: To exploit material decomposition analysis in dual-energy spectral computed tomography (CT) to assess the blood supply status of the ground-glass opacity (GGO) in lungs. Materials and Methods: This retrospective study included 48 patients with lung adenocarcinoma, who underwent a contrast-enhanced dual-energy spectral CT scan before treatment (53 GGOs in total). The iodine concentration (IC) and water content (WC) of the GGO, the contralateral and ipsilateral normal lung tissues were measured in the arterial phase (AP) and their differences were analyzed. IC, normalized IC (NIC), and WC values were compared between the pure ground-glass opacity (pGGO) and the mixed ground-glass opacity (mGGO), and between the group of preinvasive lesions and the minimally invasive adenocarcinoma (MIA) and invasive adenocarcinoma (IA) groups. Results: The values of pGGO (IC = 20.9 ± 6.2 mg/mL and WC = 345.1 ± 87.1 mg/mL) and mGGO (IC = 23.8 ± 8.3 mg/mL and WC = 606.8 ± 124.5 mg/mL) in the AP were significantly higher than those of the contralateral normal lung tissues (IC = 15.0 ± 4.9 mg/mL and WC = 156.4 ± 36.8 mg/mL; IC = 16.2 ± 5.7 mg/mL and WC = 169.4 ± 41.0 mg/mL) and ipsilateral normal lung tissues (IC = 15.1 ± 6.2 mg/mL and WC = 156.3 ± 38.8 mg/mL; IC = 15.9 ± 6.0 mg/mL and WC = 174.7 ± 39.2 mg/mL; all p < 0.001). After normalizing the data according to the values of the artery, pGGO (NIC = 0.1 and WC = 345.1 ± 87.1 mg/mL) and mGGO (NIC = 0.2 and WC = 606.8 ± 124.5 mg/mL) were statistically different (p = 0.049 and p < 0.001, respectively), but not for the IC value (p = 0.161). The WC values of the group with preinvasive lesions and MIA (345.4 ± 96.1 mg/mL) and IA (550.1 ± 158.2 mg/mL) were statistically different (p < 0.001). Conclusion: Using dual-energy spectral CT and material decomposition analysis, the IC in GGO can be quantitatively measured which can be an indicator of the blood supply status in the GGO.
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