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Search Results: 1 - 10 of 120218 matches for " Lilin Wang "
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Interface instability modes in freezing colloidal suspensions - revealed from onset of planar instability
Lilin Wang,Jiaxue You,Zhijun Wang,Jincheng Wang,Xin Lin
Physics , 2015,
Abstract: Freezing colloidal suspensions widely exists in nature and industry. Interface instability has attracted much attention for the understandings of the pattern formation in freezing colloidal suspensions. However, the interface instability modes, the origin of the ice banding or ice lamellae, are still unclear. In-situ experimental observation of the onset of interface instability is still absent up to now. Here, by directly imaging the initial transient stage of planar interface instability in directional freezing colloidal suspensions, we proposed three interface instability modes, Mullins-Sekerka instability, global split instability and local split instability. All the three instability modes come from the competition of the solute boundary layer and the particle boundary layer, which only can be revealed from the initial transient stage of planar instability in directional freezing.
History-dependent Selection of Primary Dendritic Spacing in Directionally Solidified Alloy
Linlin WANG,Xin LIN,Guolu DING,Lilin WANG,Weidong HUANG,
Linlin
,WANG,Xin,LIN,Guolu,DING,Lilin,WANG,Weidong,HUANG

材料科学技术学报 , 2007,
Abstract: Directional solidification experiments were carried out for succinonitrile-1.0 wt pct acetone alloy with the orientation of dendritic arrays being not parallel to the direction of the temperature gradient. Experimental results show that there exists an allowable range of primary dendritic spacing under a given growth condition.The average primary spacing depends not only on the current growth conditions but also on the way by which the conditions were achieved. The upper limit of the allowable range becomes smaller in comparison with that with <001> direction of dendrite arrays parallel to the direction of the temperature gradient, which means that the history-dependence of dendritic growth is weaker under this condition. The lower limit obtained is compared with a self-consistent model, which shows a good agreement with experimental results.
Can secondary nucleation exist in ice banding of freezing colloidal suspensions?
Jiaxue You,Jincheng Wang,Lilin Wang,Zhijun Wang,Xiaobing Hu,Junjie Li,Xin Lin
Physics , 2015,
Abstract: The formation mechanism of ice banding in the system of freezing colloidal suspensions, which is of significance in frost heaving, ice-templating porous materials and biological materials, still remains a mystery. Recently, the theory of secondary nucleation and growth of ice has been proposed to explain the emergence of a new ice lens. However, this theory has not been quantitatively examined. Here, we quantitatively measured the initial interfacial undercooling of a new ice lens and the nucleation undercoolings of suspensions. We found that the interfacial undercooling can not satisfy the nucleation undercooling of ice and hence disprove the secondary nucleation mechanism for ice banding.
Interfacial undercooling in the solidification of colloidal suspensions
Jiaxue You,Lilin Wang,Zhijun Wang,Junjie Li,Jincheng Wang,Xin Lin,Weidong Huang
Physics , 2015,
Abstract: Interfacial undercooling is of significant importance on microscopic pattern formation in the solidification of colloidal suspensions. Two kinds of interfacial undercooling are supposed to be involved in freezing colloidal suspensions, i.e. solute constitutional supercooling (SCS) caused by additives in the solvent and particulate constitutional supercooling (PCS) caused by particles. However, quantitatively identification of the interfacial undercooling of freezing colloidal suspensions is still absent and it is still unknown which undercooling is dominant. The revealing of interfacial undercooling is closely related to the design of ice-templating porous materials. Based on quantitative experimental measurements, we show that the interfacial undercooling mainly comes from SCS caused by the additives in the solvent, while the PCS can be ignored. This finding implies that the PCS theory is not the fundamental physical mechanism for patterning in the solidification of colloidal suspensions. Instead, the patterns in ice-templating method can be controlled effectively by adjusting the additives.
In situ observation the interface undercooling of freezing colloidal suspensions with differential visualization method
Jiaxue You,Lilin Wang,Zhijun Wang,Junjie Li,Jincheng Wang,Xin Lin,Weidong Huang
Physics , 2015, DOI: 10.1063/1.4928108
Abstract: Interface undercooling is one of the most significant parameters in the solidification of colloidal suspensions. However, quantitative measurement of interface undercooling of colloidal suspensions is still a challenge. Here, a new experimental facility and gauging method are designed to directly reveal the interface undercooling on both static and dynamic cases. The interface undercooling is visualized through the discrepancy of solid/liquid interface positions between the suspensions and its solvent in a thermal gradient apparatus. The resolutions of the experimental facility and gauging method are proved to be 0.01 K. The high precision of the method comes from the principle of converting temperature measurement into distance measurement in the thermal gradient platform. Moreover, both static and dynamic interface undercoolings can be quantitatively measured.
The age of the base of the paleoproterozoic Hutuo Group in the Wutai Mountains area, North China Craton: SHRIMP zircon U-Pb dating of basaltic andesite
LiLin Du,ChongHui Yang,JingHui Guo,Wei Wang,LiuDong Ren,YuSheng Wan,YuanSheng Geng
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-009-3611-8
Abstract: Basalt and basaltic andesite metamorphosed at greenschist facies occurs with conglomerate layers at the bottom of the Paleoproterozoic Hutuo Group in the Wutai Mountains area, North China Craton. Detailed geological surveying confirms that these volcanic rocks are conformable within the neighboring sedimentary rocks. The SHRIMP results on basaltic andesite are divided into two groups. In one group the 207Pb/206Pb ages are from 2433 to 2558 Ma, which is consistent with the basement crustal age in Fuping and Wutai areas. In the other group, 13 grains yielded a weighted mean 207Pb/206Pb age of 2140±14 Ma. The latter is interpreted as the eruption age of the basaltic andesite, and gives the age of the base of the Hutuo Group. This result further suggests that the Hutuo Group formed in the middle Paleoproterozoic, not the early Palaeoproterozoic or late Archaean, as thought before, and is related to a 2.2–2.1 Ga rifting event in the Central North China Craton.
Watt-level ultrahigh-OSNR single-longitudinal-mode tunable Brillouin fiber laser
Gaomeng Wang,Li Zhan,Jinmei Liu,Tao Zhang,Jun Li,Liang Zhang,Junsong Peng,Lilin Yi
Physics , 2012, DOI: 10.1364/OL.38.000019
Abstract: A watt-level ultrahigh optical signal-to-noise ratio (OSNR) single-longitudinal-mode (SLM) tunable Brillouin fiber laser (BFL) has been demonstrated.By optimizing the length of the single mode fiber (SMF) cavity at 11m and its output ratio at sixty percent, 1.04 W output power, as well as stable SLM operation is obtained at 2.24 W pump power. The single pass cavity BFL has the advantage that Brillouin pump frequency doesn't need to match the cavity mode, thus the stability is greatly improved. As only SMF is used in the cavity, the operate wavelength can be tunable without the restriction from self lasing cavity mode. Furthermore, it proves that core-pumped single frequency fiber laser is able to generate watt-level power. The laser has excellent performance in terms of noise, linewidth, and stability.
Formation ages and source regions of the Palaeoproterozoic Gaofan, Hutuo and Dongjiao groups in the Wutai and Dongjiao areas of the North China Craton from SHRIMP U-Pb dating of detrital zircons: Resolution of debates over their stratigraphic relationships
YuSheng Wan,PeiSheng Miao,DunYi Liu,ChongHui Yang,Wei Wang,HuiChu Wang,ZheJiu Wang,ChunYan Dong,LiLin Du,HongYing Zhou
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-009-0615-3
Abstract: This paper reports detrital zircon age distributions of meta-sedimentary rocks of the Gaofan, Hutuo and Dongjiao groups in the Wutai and Dongjiao areas of the North China Craton. Detrital zircons of a quartzite from the Gaofan Group are mainly ~2.5 Ga in age, with some ~2.7 Ga and older. A quartzite pebble from the basal conglomerate of the Hutuo Group is similar in detrital zircon age distribution to the quartzite of the Gaofan Group. For a meta-feldspar-quartz sandstone from the Dongjiao Group, the age of detrital zircons is mainly concentrated at ~2.5 Ga. No zircons older than 2.6 Ga have been identified, but with some being 1.84 Ga and 2.2–2.0 Ga in age. Combined with earlier studies, the following conclusions can be drawn: (1) The Gaofan Group is early Palaeoproterozoic in age and is much younger and unrelated to the late Neoarchaean Wutai granite-greenstone terrane, which it unconformably overlies. As such, the Gaofan Group is one of the oldest Palaeoproterozoic meta-sedimentary units in the North China Craton. (2) The Hutuo Group was deposited in the middle Palaeoproterozoic (2.14-2.09 Ga) on a continental basement, after the early Palaeoproterozoic Gaofan Group. (3) The Dongjiao Group was formed after 1.84 Ga, and probably belongs to the lower portion of the Changcheng System. (4) The detrital zircons from all the three groups show an obvious age peak of ~2.5 Ga, being sourced from the igneous rocks formed in the intense tectono-magma-thermal events at the end of Archaean in the North China Craton.
ER81 Expression in Breast Cancers and Hyperplasia
YuanYuan Wang,Li Wang,Yue Chen,Lin Li,XuanTao Yang,BaoLin Li,ShuLing Song,LiLin Yang,Yan Hao,JuLun Yang
Pathology Research International , 2011, DOI: 10.4061/2011/980513
Abstract: ER81 is a transcription factor that may contribute to breast cancer; however, little known about the role of ER81 in breast carcinogenesis. To investigate the role of ER81 in breast carcinogenesis, we examined ER81 expression in IDC, DCIS, ADH, HUT, and normal breast tissues by immunohistochemical staining. We found that ER81 overexpression was detected in 25.7% (9/35) of HUT, 41.2% (7/17) of ADH, 54.5% (12/22) of DCIS, and 63.0% (51/81) of IDC. In 20 of breast cancer tissues combined with DCIS, ADH, and HUT, ER81 expression was found in 14/20 (70%) IDC. In these 14 cases all cases were ER81 positive expression in DCIS, 13 of 14 cases were positively expressed of ER81 in ADH and 8 of 14 were positive for ER81 in HUT components. A statistical significance was found between NBT and HUT ( ) and HUT and ADH ( ). Clinical-pathological features analysis of breast cancer revealed that ER81 expression was significantly associated with Her2 amplification and was negatively associated with ER and PR expression. Our results demonstrated that ER81 overexpression was present in the early stage of breast development that suggested that ER81 overexpression may play an important role in breast carcinogenesis. 1. Introduction Breast carcinogenesis is thought to undergo a transition from normal epithelium to invasive carcinoma (IDC) via hyperplasia of usual type (HUT), atypical ductal hyperplasia (ADH), and carcinoma in situ (DCIS) [1]. Over 14% of breast cancer diagnosed in the United States annually are DCIS, and approximately 50% of untreated DCIS will develop into an IDC within 24 years after the original biopsy [2]. However, it is unclear how IDC develop from these lesions. ER81 (ETS-related 81), also called ETS variant 1 (ETV1), is a transcription factor that is a member of the ETS family of DNA-binding proteins [3–5]. Its association with cancer was first noted in Ewing tumors, in which the EWS gene can be translocated onto the ER81 gene and the resultant EWS-ER81 fusion protein exerts oncogenic properties [6]. From then on, many findings suggest that dysregulation of ER81 target genes in disparate tumors like Ewing sarcomas and prostate carcinomas are causally involved in tumorigenesis [7]. Of note, ER81 transcriptional activity is dramatically enhanced upon Her2/Neu (a receptor tyrosine kinase and proto-oncoprotein especially associated with breast cancer) overexpression [8, 9]. Moreover, ER81 mRNA levels are increased in murine cell lines and tumors overexpressing Her2/Neu and also in many human breast cancer cell lines, which suggests that ER81 may contribute
AlGaN/GaN HEMT Device Optimization and I-V Characteristics
AlGaN/GaN材料HEMT器件优化分析与I-V特性

Ma Long,Wang Yan,Yu Zhiping,Tian Lilin,
祃龙
,王燕,余志平,田立林

半导体学报 , 2004,
Abstract: 在考虑Al Ga N / Ga N异质结中的压电极化和自发极化效应的基础上,自洽求解了垂直于沟道方向的薛定谔方程和泊松方程.通过模拟计算,研究了Al Ga N / Ga N HEMT器件掺杂层Al的组分、厚度、施主掺杂浓度以及栅偏压对二维电子气特性的影响.用准二维物理模型计算了Al Ga N/ Ga N HEMT器件的输出特性,给出了相应的饱和电压和阈值电压,并对计算结果和Al Ga N/ Ga N HEMT器件的结构优化进行了分析.
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