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Low-temperature dielectric relaxation associated with NbO_6 octahedron distortion in antimony modified potassium sodium niobate ceramics

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Journal of Materials Science & Technology 2022年第20期115卷 189-198页

作者： Nan Zhang Xiang Lv Xi-xiang Zhang Jing Lyu Shuo-Wang Yang Jiagang Wu Department of Materials Science Sichuan UniversityChengdu 610065China Division of Physical Science and Engineering King Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia Department of Chemistry National University of Singapore3 Science Drive 3117543Singapore Institute of High Performance Computing Agency for ScienceTechnology and Research1 Fusionopolis Way#16-16 Connexis138632Singapore

Although the antimony(Sb) has been widely used to modify potassium sodium niobate(KNN) ceramics for tailoring the phase structure and performance, the role of Sb still remains insufficiently understood,consequently hindering the understanding of the physical origin of high-performance KNN-based ceramics. Here, we combine the experiments and first-principles calculations to deeply reveal the effects of Sb on KNN ceramics. Our results reveal a re-entrant-like relaxation behavior near the rhombohedralorthorhombic(R-O) phase transition at the low content of Sb, which transforms into a canonical one at higher content of Sb. First-principles calculations show a significantly decreased difference in the bond length of six B-O bonds of Nb O6 octahedral in Sb-modified KNN ceramics compared to pristine KNN ceramics, responsible for the low-temperature re-entrant-like dielectric relaxation. Furthermore, the addition of Sb would soften the B-O repulsion and gradually break the long-range ferroelectric ordering,resulting in the occurrence of nanoscale domains and enhanced local heterogeneity. Finally, we find that the optimized piezoelectric properties are the trade-off between the long-range ferroelectric ordering and the local heterogeneity. Therefore, this work not only deeply reveals the effects of Sb on KNN ceramics from multi-scale perspectives but also helps the future composition design for achieving high piezoelectricity.

关键词： KNN-based ceramics Re-entrant-like relaxation Covalency Multiphase coexistence Local heterogeneity

Computational Modelling of Retrofitting a Coal Fired Boiler Type OP-230 for Predicting NOX Reduction

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Journal of Thermal Science 2018年第5期27卷 433-439页

作者： MOTYL Przemyslaw LACH Jan Faculty of Mechanical Engineering Kazimierz Pulaski University of Technology and Humanities in RadomRadom 26-600poland Faculty of Engineering Management Bialystok University of TechnologyKleosin 16-001 Poland

This study focuses on a CFD modelling of biomass-derived syngas co-firing with coal in an older mid-sized PC-fired boiler of type OP-230 with low-emission burners on the front wall. The simulations were performed to determine whether the boiler can be retrofitted for the fulfilment of the prospective environmental protection regulations relating to levels of NO_X emissions. The improvement of the air staging via the dual-fuel technique was based on the indirect co-firing technology. The impact of two arrangements of dedicated syngas nozzles(below and above the existing coal burners), two syngas compositions and two heat replacements(5% and 15%) on the course of thermal processes in a furnace was tested. The reductions in NO_X emissions were predicted relative to the baseline when only coal is combusted. The highest reduction of about 38% was achieved with the syngas nozzles below the existing coal burners and 15% heat replacement. This arrangement of nozzles offers the residence time sufficient to co-fire coal with waste derived syngas. A lower reduction in NO_X emissions was obtained with the nozzles above the burners as the enlargement of local fuel rich zone near syngas injection becomes significant for 15% heat replacement. Results provide for the decreasing impact of methane content along with the increase of syngas heat input. The avoided CO_2 emissions through the syngas indirect co-firing with coal in the boiler are linear function of heat replacements.

关键词： boiler modelling co-firing biomass derived syngas NOX emission retrofitting

Efficacy of intra-tumor injection of Xiao-Zhi-Ling on transplanted hepatoma in rats

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World Journal of Gastroenterology 2003年第9期9卷 2121-2124页

作者： Yun Lu Li-Qun Wu Department of Hepato-biliary Vascular Surgery,Medical College,Qingdao University,Qingdao 266003,Shandong Province,China Department of Hepato-biliary Vascular Surgery Medical College Qingdao University 16 Jiangsu Road Qingdao 266003 Shandong Province China. cloudylucn@***

AIM: To study the therapeutic effectiveness of intra-tumorinjection of Xiao-Zhi-Ling(XZL) on transplanted hepatomain ***: Sixty rats were divided into 3 groups (groupsS, X and E), 20 in each. Different drugs were injected intothe implanted hepatoma (Group S with 0.2 mi saline ascontrol, group X with 0.2 mi XZL, group E with 0.2 miethanol). After 3 days and 8 days respectively, we detectedthe hepatoma volume (HV), the level of albumin, alanineaminotransferase (ALT), aspartate aminotransferase (AST)and alkaline phosphatase (ALP) in serum, and the expressionof proliferating cell nuclear antigen (PCNA) in ***: The results were obtained after 3 days, the HVsin groups X and E were smaller than those in group S (groupX vs S P=0.010*, group Evs S P=0.002*, P＜0.05). Thelevels of ALT and AST in group S and X were lower thanthose in group E (ALT Group S vs E P=0.019*, group X vsEP=0.003*, P＜0.05; AST group X vs E P=0.002*, P＜0.05).The levels of ALP and PCNA labeling index in group X werelower than those in group S and E (ALP group X vs SP=0.000*, group X vs E P=0.000*. P＜0.05; PCNA group XvsS P=0.008*, group X vsE P=0.048*, P＜0.05). The levelsof creatinine in group S were lower than those in group E(group S vs E P=0.017, P＜0.05). The degree of tumornecrosis in group S was lower than those in groups X and E(group S vsX P=0.006*, group S vs E P=0.006*, P＜0.05).After 8 days, the HVs in groups X and E were smaller thanthose in group S (group X vs S P=0.007*, group Evs SP=0.004*, P＜0.05). The difference of HVs between groupsX and E was not significant. The levels of albumin, ALT, ASTand creatinine in group X were not higher than those inother groups, the levels of ALP and PCNA in group X werelower than those in groups S and E (ALP group X vs EP=0.006* P＜0.05; PCNA group X vsS P=0.044*, group Xvs E P=0.021*, P＜0.05). The degree of tumor necrosis ingroup S was lower than that in groups X and E (group S vsX P=0.001*, group S vs E P=0.002*, P＜0.05).CONCLUSION: The

关键词： Xiao-Zhi-Ling注射液中药制剂肝细胞癌肿瘤转移

Recent Advances in In-Memory Computing:Exploring Memristor and Memtransistor Arrays with 2D Materials

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Nano-Micro Letters 2024年第7期16卷 1-30页

作者： Hangbo Zhou Sifan Li Kah-Wee Ang Yong-Wei Zhang Institute of High Performance Computing(IHPC) Agency for ScienceTechnology and Research(A*STAR)1 Fusionopolis Way#16-16 ConnexisSingapore 138632Republic of Singapore Department of Electrical and Computer Engineering National University of Singapore4 Engineering Drive 3Singapore 117583Republic of Singapore Institute of Materials Research and Engineering Agency for ScienceTechnology and Research(A*STAR)2 Fusionopolis WaySingapore 138634Republic of Singapore

The conventional computing architecture faces substantial chal-lenges,including high latency and energy consumption between memory and processing *** response,in-memory computing has emerged as a promising alternative architecture,enabling computing operations within memory arrays to overcome these *** devices have gained significant attention as key components for in-memory computing due to their high-density arrays,rapid response times,and ability to emulate biological *** these devices,two-dimensional(2D)material-based memristor and memtransistor arrays have emerged as particularly promising candidates for next-generation in-memory computing,thanks to their exceptional performance driven by the unique properties of 2D materials,such as layered structures,mechanical flexibility,and the capability to form *** review delves into the state-of-the-art research on 2D material-based memristive arrays,encompassing critical aspects such as material selection,device perfor-mance metrics,array structures,and potential ***,it provides a comprehensive overview of the current challenges and limitations associated with these arrays,along with potential *** primary objective of this review is to serve as a significant milestone in realizing next-generation in-memory computing utilizing 2D materials and bridge the gap from single-device characterization to array-level and system-level implementations of neuromorphic computing,leveraging the potential of 2D material-based memristive devices.

关键词： 2D materials Memristors Memtransistors Crossbar array In-memory computing

Isolation and characterization of heterotrophic nitrifying bacteria in MBR

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Journal of Environmental Sciences 2005年第4期17卷 589-592页

作者： LINYan HEYi-liang KONGHai-nan LIUBin-bin LIYan INAMONYuhei SchoolofEnvironmentalScienceandEngineering ShanghaiJiaotongUniversityShanghai200240China. DepartmentofBiotechnology ShanghaiJiaotongUniversityShanghai200240China NationalInstituteforEnvironmentalStudies16-20nogawa.Tsukuba IbarakiJapan）

The study presented the method for isolating the heterotrophic nitrifiers and the characterization of heterotrophic nitrification. Continuous tests via a membrane bioreactor (MBR) were operated under the controlled conditions to proliferate the nitrifiers. Heterotrophic nitrifying bacteria were isolated from the system in which the efficiency of total nitrogen(TN) removal was up to 80%. Since no autotrophic ammonium and nitrite oxidizers could be detected by fluorescence in situ hybridization(FISH), oxidized-N production was unlikely to be catalyzed by autotrophic nitrifiers during the heterotrophic nitrifiers' isolation in this study. The batch test results indicate that the isolated heterotrophic bacteria were able to nitrify. After 3 weeks incubation, the efficiencies of the COD removal by the three isolated bacterial strains B1, B2, and B3 were 52 6%, 71 7%, and 77 7%, respectively. The efficiencies of the TN removal by B1, B2, and B3 were 35 6%, 61 2% and 68 7%, respectively.

关键词： membrane bioreactor(MBR) simultaneous nitrification and denitrification(SND) heterotrophic nitrification aerobic denitrification

Hydrodynamic Interaction of Elastic Capsules in Bounded Shear Flow

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Communications in Computational Physics 2014年第9期16卷 1031-1055页

作者： D.V.Le Zhijun Tan Institute of High Performance Computing Agency for ScienceTechnology and Research1 Fusionopolis Way#16-16 ConnexisSingapore 138632 School of Mathematics and Computational Science Sun Yat-sen UniversityGuangzhou 510275China Province Key Laboratory of Computational Science Sun Yat-sen UniversityGuangzhou 510275China.

This paper presents a modified Loop’s subdivision algorithm for studying the deformation of a single capsule,the hydrodynamic interaction between two capsules and the hydrodynamic diffusion of a suspension of capsules in bounded shear flow.A subdivision thin-shell model is employed to compute the forces generated on the surface of the elastic capsule during *** capsule surface is approximated using the modified Loop’s subdivision scheme which guarantees bounded curvature and C1 continuity everywhere on the limit *** present numerical technique has been validated by studying the deformation of a spherical capsule in shear *** are also performed for a biconcave capsule over a wide range of shear rates and viscosity ratios to investigate its *** addition,the hydrodynamic interaction between two elastic capsules in bounded shear flow is *** on the wall separation distance,the trajectory-bifurcation points that separate reversing and crossing motions for both spherical and biconcave capsules can be *** to the spherical capsules,the biconcave capsules exhibit additional types of interaction such as rotation and head-on *** head-on collision results in a large trajectory shift which contribute to the hydrodynamic diffusion of a suspension.A suspension of a large number of biconcave capsules in shear flow is also simulated to show the ability of the modified scheme in running a large-scale simulation over a long period of time.

关键词： Thin shell elastic capsules red-blood cells subdivision surfaces immersed boundary method Navier-Stokes equations.

The Shock Effects of Orthopyroxene in the Heavily Shocked Meteorites

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Chinese Science Bulletin 1993年第12期38卷 1024-1027页

作者：陈鸣谢先德 Guangzhou Branch Institute of Geochemistry Academia Sinica Guangzhou 510640 PRC Received August 16 1992.

1 Introduction The information of the deformation and phase transformation of minerals under the impact of different intensities can be obtained from some meteorites. Therefore, meteorites are good samples for the study of shock effects of minerals in natural impact process. Orthopyroxene is a kind of main rock-forming mineral in chondrite. The study of

关键词： orthopyroxene chondrite shock effect.

Relationship between expression of E-cadherin-catenin complex and clinicopathologic characteristics of pancreatic cancer

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World Journal of Gastroenterology 2003年第2期9卷 368-372页

作者： Yu-Jun Li Xiang-Rui Ji Department of Pathology, the Affiliated Hospital of Medical College, Qingdao University, Qingdao 266003, Shandong Province, China Department of Pathology the Affiliated Hospital of Medical College Qingdao University 16 Jiangsu Rd Qingdao 266003 China. yunjun-Li66@***

AIM: To investigate the expression of E-cadherin and alpha-catenin and beta-catenin in pancreatic carcinoma and itsrelationship with the clinicopathologic characteristics, andclarify the mechanism of invasion and metastasis ofpancreatic ***: The expression of E-cadherin and alpha-, beta-catenin was examined in 47 cases of infiltrative ductaladenocarcinoma of pancreas and 12 adult normal pancreatictissues by immunohistochemical ***: The immunoreactivity of E-cadherin and alpha-,beta-catenin was expressed by normal ductal and acinarcells with strong membranous staining at the intercellularborder in 12 cases of adult normal pancreatic tissues. Abnormalexpression of E-cadherin and alpha-, beta-catenin in 47pancreatic carcinoma tissues was demonstrated in 53.2 %,61.7 % and 68.1%, respectively. Both abnormal expressionof E-cadherin and alpha-catenin significantly correlated withdifferentiation, lymph node and liver metastases (P＜0.05,respectively), whereas aberrant beta-catenin expression onlycorrelated with lymph node and liver metastases (P＜0.001).Abnormal E-cadherin and alpha-, beta-catenin expressionwas not associated with tumor size, invasion and survivaltime of patients (P＞0.05, all).CONCLUSION: Pancreatic cancer likely occurs in case ofE-cadherin-catenin complex genes mutations or deletionsand abnormal expression of proteins, which significantlycorrelate with the biologic character of the tumor and lymphnode and liver metastases. It is suggested that the abnormalE-cadherin-catenin complex expression plays an importantrole in the development and progression of tumor, and thusmay become a new marker in pancreatic cancer metastasis.

关键词： E-钙粘素连接素胰腺癌临床病理学肿瘤侵袭肿瘤转移免疫活性

SYNTHESIS OF NOVEL BI-FUNCTIONAL COPOLYMER BEARING STERICALLY HINDERED PHENOL AND HINDERED AMINE GROUPS VIA RING-OPENING METATHESIS POLYMERIZATION

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Chinese Journal of Polymer Science 2008年第5期26卷 525-531页

作者： Bo-yong Xue Kenichi Ogata Akinori Toyota Graduate School of Engineering Tokyo University of Agriculture and Technology2-24-16 Naka-choKoganei-shiTokyo 184-8588Japan

Norbornene derivatives exo,endo-2-[2-(3,5-di-tert-butyl-4-hydroxyphenoxy)-acetoxy]methyl-5-norbornene(M1) and 3,3,5,5-tetramethyl-4-piperidinyl 5-norbornene-exo,endo-2-carboxylate(M2)were synthesized and polymerized by RuCl_2(=CHPh)(PCy_3)_2 to prepare a novel kind of bi-functional polymer bearing sterically hindered phenol(SHP)and hindered amine(HLAS)groups via ring-opening metathesis polymerization(ROMP).The resulting copolymers were characterized by gel permeation chromatography(GPC),~1H-NMR and differen...

关键词： Sterically hindered phenol Hindered amine Ring-opening metathesis polymerization(ROMP)