Find Research Output

Research Output
  • All
  • Scholar Profiles
  • Research Units
  • Research Output
Filter
Department Publication Year Content Type Data Sources

SELECTED FILTERS

2017
Clear all

1.Energy Dissipation During Impact of an Agglomerate Composed of Autoadhesive Elastic-Plastic Particles

Author:Liu, LF;Thornton, C;Shaw, SJ

Source:PROCEEDINGS OF THE 7TH INTERNATIONAL CONFERENCE ON DISCRETE ELEMENT METHODS,2017,Vol.188

Abstract:Discrete Element Method is used to simulate the impact of agglomerates consisting of autoadhesive, elastic-plastic primary particles. In order to explain the phenomenon that the elastic agglomerate fractures but the elastic-plastic agglomerate disintegrates adjacent to the impact site for the same impact velocity, we increase the impact velocity and lower the yield strength of the constituent particles of the agglomerate. We find that increasing the impact velocity can lead to the increased number of yielded contacts, and cause the elastic-plastic agglomerate to disintegrate faster. Mostly importantly, the energy dissipation process for the elastic-plastic agglomerate impact has been investigated together with the evolutions of the yielding contacts, and evolutions of velocity during impact.

2.Deformations of the standard model: SUq(3) flavor symmetry

Author:Gresnigt, NG

Source:XXIV INTERNATIONAL CONFERENCE ON INTEGRABLE SYSTEMS AND QUANTUM SYMMETRIES (ISQS-24),2017,Vol.804

Abstract:The quantum group SUq(3) = Uq(su(3)) is taken as a baryon flavor symmetry and exceptionally accurate octet and decuplet baryons mass relations are obtained by accounting for the electromagnetic contribution to baryon masses (to zeroth order). The resulting charge specific q-deformed octet and decuplet baryon mass sum formulas are accurate to 0.02%% and 0.08%% respectively; a factor of 20 reduction in error compared to the standard Gell-Mann-Okubo mass formulas. An explicit formula for the Cabibbo angle, taken to be pi/14, in terms of the deformation parameter q and spin parity J(P) of the baryons is obtained.

3.Minimize Reactive Power Losses of Dual Active Bridge Converters using Unified Dual Phase Shift Control

Author:Wen, HQ;Su, B

Source:JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY,2017,Vol.12

Abstract:This paper proposed an unified dual-phase-shift (UDPS) control for dual active bridge (DAB) converters in order to improve efficiency for a wide output power range. Different operating modes of UDPS are characterized with respect to the reactive current distribution. The proposed UDPS has the same output power capability with conventional phase-shift (CPS) method. Furthermore, its implementation is simple since only the change of the leading phase-shift direction is required for different operating power range. The proposed UDPS control can minimize both the inductor rms current and the circulating reactive current for various voltage conversion ratios and load conditions. The optimal phase-shift pairs for two bridges of DAB converter are derived with respect to the comprehensive reactive power loss model, including the reactive components delivered from the load and back to the source. Simulation and experimental results are illustrated and explained with details. The effectiveness of the proposed method is verified in terms of reactive power losses minimization and efficiency improvement.

4.Quantitative and rapid detection of microcystin-LR using time-resolved fluorescence immunochromatographic assay based on europium nanospheres

Author:Zhang, Y;Ding, XL;Guo, MM;Han, TT;Huang, ZJ;Shang, HT;Huang, B

Source:ANALYTICAL METHODS,2017,Vol.9

Abstract:In the present study, a novel time-resolved fluorescence immunochromatographic assay was established for the rapid quantitative detection of microcystin-leucine arginine (MC-LR). In this method, the europium nanoshpere labelled with anti-MC-LR antibodies was used as the luminescent tracer, dissolved in the running buffer and then added with the sample solution on the pad. MC-LR-BSA and goat anti-mouse antibody were dispensed on the nitrocellulose membrane for the test and the control line, respectively. The optimal parameters were 0.05 g L-1 MC-LR-BSA, 1 : 100 colloidal europium-antibody conjugate, and 10 min reaction time. The linear working range for MC-LR was 0.1-5 mu g L-1 with an IC50 of 0.78 mu g L-1 and a sensitivity of 0.035 mu g L-1. The low cross-reactivity was observed with MC-YR and MC-LF. The assay accuracy was confirmed by the HPLC method with a correlation coefficient of 0.99. When the variable coefficients were 4.4%% and 5.4%%, the average recoveries of tap and lake water were 94.6%% and 102.8%%, respectively. The time-resolved fluorescence immunochromatographic assay provides a sensitive, simple, and speedy performance for MC-LR quantitative determination and has a potential use for water sample screening.

5.The dual effects of home country institutions on the internationalization of private firms in emerging markets Evidence from China

Author:Li, FR;Ding, D

Source:MULTINATIONAL BUSINESS REVIEW,2017,Vol.25

Abstract:Purpose - This study aims to examine the dual effects of home country institutional forces (i.e. institutional support and institutional constraints) on the internationalization of private firms in emerging markets. By doing so, this study aims to examine the applicability of the two seemingly paradoxical views (i.e. the governmental promotion view and the institutional escapism view) in explaining private firms' internationalization. Further, this study investigates how the effect of the home country institutional environment on firms' internationalization is contingent upon firm characteristics. Design/methodology/approach - A sample of Chinese private firms is used to examine the effect of home country institutions on internationalization. Findings - Empirical findings suggest that both institutional support and institutional constraints promote the internationalization of private firms in emerging markets. Moreover, it is found that firm resources strengthen the effect of government support on internationalization. It is also found that firms' business ties strengthen the effect of institutional constraint on internationalization, whereas firms' political ties weaken the effect of institutional constraints on internationalization. Originality/value - By adopting an integrated and comprehensive investigation of the dual effects of home country institutional environment in emerging markets on internationalization, this study provides evidence to the applicability of the two competing views (i.e. the governmental promotion view and the institutional escapism view) in relation to home country institutional effects on internationalization. In addition, this study examines how institutional effects vary across firms with different resources and social ties, thus extends understandings of the boundary conditions of the two institutional effects.

6.Implications of Sino-Japanese Rivalry in High-Speed Railways for Southeast Asia

Author:Pavlicevic, D;Kratz, A

Source:EAST ASIAN POLICY,2017,Vol.9

Abstract:China and Japan are intensively vying for high-speed rail markets in Southeast Asia. Focusing on the developments surrounding the bid for Indonesia's first high-speed rail project from Jakarta to Bandung, this paper investigates Japan and China's relative strategies, and considers the policy options available to ASEAN to manage the risks rooted in Sino-Japanese competition in the sector.

7.Effects of Biased Irradiation on Charge Trapping in HfO2 Dielectric Thin Films

Author:Mu, YF;Zhao, CZ;Lu, QF;Zhao, C;Qi, YF;Lam, S;Mitrovic, IZ;Taylor, S;Chalker, PR

Source:4TH INTERNATIONAL CONFERENCE ON THE ADVANCEMENT OF MATERIALS AND NANOTECHNOLOGY (ICAMN IV 2016),2017,Vol.1877

Abstract:This paper reports the low-dose-rate radiation response of Al-HfO2/SiO2-Si MOS devices, in which the gate dielectric was formed by atomic layer deposition (ALD) with 5-nm equivalent oxide thickness. The degradation of the devices was characterized by a pulse capacitance-voltage (CV) and on-site radiation response technique under continuous gamma (gamma) ray exposure at a relatively low dose rate of 0.116 rad (HfO2)/s. Compared with conventional CV measurements, the proposed measurements extract significant variations of flat-band voltage shift of the hafnium based MOS devices. The large flat-band voltage shift is mainly attributed to the radiation-induced oxide trapped charges, which are not readily compensated by bias-induced charges produced over the measurement timescales (for timescales less than 5 ms). A negative flat-band voltage shift up to -1.02 V was observed under a positive biased irradiation with the total dose up to 40 krad (HfO2) and with the electric field of 0.5 MV/cm. This is attributed to net positive charge generation in the HfO2 oxide layer. The generated charges are transported towards the HfO2/SiO2 interface, and then form effective trapped holes in the HfO2. Similarly, a positive flat-band voltage shift up to 1.1 V was observed from irradiation under negative bias with an electric field of -0.5 MV/cm. The positive shift is mainly due to the accumulation of trapped electrons. Analyses of the experimental results suggest that both hole and electron trapping can dominate the radiation response performance of the HfO2-based MOS devices depending upon the applied bias. It was also found there was no distinct border traps with irradiation in all cases.

8.Parametric investigation of polymethacrylate monolith synthesis and stability via thermogravimetric characterisation

Author:Acquah, C;Danquah, MK;Moy, CKS;Anwar, M;Ongkudon, CM

Source:ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING,2017,Vol.12

Abstract:Polymethacrylate monoliths are synthetic adsorbents with macroporous and mesoporous interconnected channels that can be engineered to target the hydrodynamic features of a wide range of molecular species. However, rigorous study into the effect of synthesis conditions on their thermal stability is limited. This work attempts to characterise the influence of key synthesis process variables on the stability of polymethacrylate monoliths using thermogravimetric analysis at a heating rate of 10 degrees C/min. Experimental results showed that the thermal stability of polymethacrylate monoliths increased with decreasing polymerisation temperature from 85 to 65 degrees C. Increasing the total porogen (P) to monomer (M) ratio increased the thermal stability of the monolith by >62%% and >50%% for P40/M60-P60/M40 and P60/M40-P80/M20, respectively. The impact of the initiator concentration, monomer variation, biporogen ratio, washing and activation of the monoliths was investigated. Nuclear magnetic resonance analyses conducted confirmed the hydrolysis of epoxy moieties on the monolith. (C) 2017 Curtin University of Technology and John Wiley & Sons, Ltd.

9.Homogeneity-preserving property of harmonic sequences from surfaces into complex Grassmann manifolds

Author:Fei Jie;Zhang Wenjuan

Source:Frontiers of Mathematics in China,2017,Vol.12

Abstract:We prove that if phi is a homogeneous harmonic map from a Riemann surface M into a complex Grassmann manifold G(k,n), then the maps of the harmonic sequences generated by phi are all homogeneous.

10.Combinations of fungal and milling pretreatments for enhancing rice straw biogas production during solid-state anaerobic digestion

Author:Mustafa, AM;Poulsen, TG;Xia, YH;Sheng, KC

Source:BIORESOURCE TECHNOLOGY,2017,Vol.224

Abstract:Rice straw was pretreated by different combinations of physical (milling) and biological (incubation with Pleurotus ostreatus fungus) treatment to improve its biodegradability and biogas production during solid-state anaerobic digestion (SS-AD). Effects of milling (62 mm) and incubation time (10, 20 and 30 d), on lignin, cellulose, and hemicellulose degradation during fungal pretreatment and methane yield during digestion were assessed by comparison with untreated rice straw. Both incubation time and milling had significant impacts on both lignin removal during fungal pre-treatment and methane yield during digestion. A combination of fungal pretreatment at 30 days followed by milling prior to anaerobic digestion resulted in 30.4%% lignin removal, the highest selectivity value (the ratio between relative lignin removal and relative cellulose removal) of 4.22, and the highest methane yield of 258 L/kg VS. This was equivalent to a 165%% increase in methane yield from SS-AD compared to untreated rice straw. (C) 2016 Elsevier Ltd. All rights reserved.

11.“第二故乡”:“一带一路”格局下的企业战略

Author:李平;杨政银

Source:Business Review,2017,Vol.

Abstract:大时代呼唤大战略,大格局孕育大战略.伫立于实现民族复兴的历史关口,置身于“一带一路”倡议的恢弘实践,中国企业迎来了全新的历史发展机遇,世界舞台正拭目以待中国企业的全新表现,尤其是中国企业如何通过国际化战略实现转型升级.毋庸讳言,中国企业迎来了跨国全球发展的春天.然而,“春天”到来之际也可能出现“倒春寒”,跨国经营的战略转型充满挑战与陷阱,一着不慎就可能万劫不复.中国企业如何顺利“春种”,获得“秋收”?本文为中国企业提供了一个在“一带一路”背景下跨国经营战略转型的管理思想及模式——“第二故乡”战略.希望这一战略模式有助于中国企业全球化经营,有助于“一带一路”倡议从宏伟畅想变成累累果实.

12.Does an institutional factor influence corporate environmental strategy? Looking through the Guanxi lens

Author:Cao, XW;Quazi, A

Source:SUSTAINABILITY ACCOUNTING MANAGEMENT AND POLICY JOURNAL,2017,Vol.8

Abstract:Purpose - This paper aims to illustrate how institutional factors, such as Guanxi (connectedness) mechanism in a transition economy, could impact managerial cognition and their temporal orientation at individual level as well as induced change on corporate environmental strategy (CES). More specifically, this paper explores the micro foundation of corporate strategy change in an attempt to examine how corporate strategic choice and actions evolve with managerial cognition of "Guanxi" with various temporal orientations. Design/methodology/approach - The paper reviews the extant literature focusing on Guanxi and CES with special attention to the temporal orientation in strategy formulation. A conceptual framework is proposed to analyze the underlying mechanism of Guanxi in mediating and shaping CES. A multi-case study with four companies operating in two industry sectors were investigated considering their relative long foothold as well as their different postures and dynamic change of corporate environment strategy in the past decades. Findings - The findings support recent critiques on the likely shift in strategic choice of firms from the traditional Guanxi- based to a rule-based format. The interactions between entrepreneurial cognition and strategic activities toward environmental issues were still influenced by deep relational embeddedness. The findings proved that managerial Guanxi cognition impacts managers' temporal orientation and their strategic choice on CES. Foreign-invested enterprises in the process of localization face the potential risk of emerging backdrop of their CES, i.e. from more active strategy to more reactive strategic posture, whereas local private-owned enterprises show a transformation from reactor to follower and even pioneer in the wave of those entrepreneurs' changing cognition on the role of Guanxi in their businesses. Research limitations/implications - One main limitation of the study is the lacking of quantitative measurement of corporate environment performance. Although the paper used multiple cases to explore the dynamics of Guanxi on impacting CES, only with further development of effective scale measurement to test corporate environment performance can increase the explaining power of the proposed theoretical model in this study. It is important to note that with data of longitudinal measurement of corporate environment performance, it would be more convincing to show the outcome of the temporal lens of Guanxi on CES. However, the lacking availability of qualified disclosed data on indicating corporate environment performance constrains another limitation for the study. Considering the complexity of corporate environment strategy, the focus cases in the paper might still lack powerful and convincing illustration to prove the impact of Guanxi on CES despite the enriched contextual data and description. It is necessary to conduct deeper analysis to exclude the impact of other possible factors on CES to highlight the direct impact of Guanxi on CES. Practical implications - The results of the in-depth analysis and interpretation of the exploration of the cases suggest that Guanxi still seems to dominate managerial thinking process as the norm is deeply rooted in their mind sets. However, Guanxi is no longer considered as a mere reactive cultural norm rather a positive mechanism through which Chinese firms can achieve their sustainable environmental strategic goals as well as economies prosperity in the rapidly competitive business landscape in modern China. Originality/value - Previous research on CES largely neglected the context factors. This paper presents a conceptual model to deepen our understanding of the contextual factor of Guanxi with a temporal perspective and its consequent influence on CES. This helps policy makers as well as strategic management researchers and academics to reconsider the mechanism of adaptation and selection in shaping CES in the event of large scale institutional change.

13.Cross-VM cache-based side channel attacks and proposed prevention mechanisms: A survey

Author:Anwar, S;Inayat, Z;Zolkipli, MF;Zain, JM;Gani, A;Anuar, NB;Khan, MK;Chang, V

Source:JOURNAL OF NETWORK AND COMPUTER APPLICATIONS,2017,Vol.93

Abstract:The state-of-the-art Cloud Computing (CC) has been commercially popular for shared resources of third party applications. A cloud platform enables to share resources among mutually distrusting CC clients and offers cost-effective, on-demand scaling. With the exponential growth of CC environment, vulnerabilities and their corresponding exploitation of the prevailing cloud resources may potentially increase. Although CC provides numerous benefits to the cloud computing tenant. However, features namely resource sharing and Virtual Machine (VM) physical co-residency raising the potential for sensitive information leakages such as Side Channel (SC) attacks. In particular, the physical co-residency feature allows attackers to communicate with another VM on the same physical machine and leak the confidential information due to inadequate logical isolation. Unlike encryption, which protects information from being decoded by unauthorized persons, SC attacks aim to exploit the encryption systems and to hide the occurrence of communication. SC attacks were initially identified as the main threat on multi-level secure systems i.e. OS, database, and networks. More recently, the focus of the researchers has shifted toward SC attacks in CC. Since the last level cache (L2 or L3) is always shared between VM, is the most targeting device for these attacks. Therefore, the aim of this article is to explore cross-VM SC attacks involving the CPU cache and their countermeasures in CC and to compare with the traditional SC attacks and countermeasures. We categorized the SC attacks according to the hardware medium they target and exploit, the ways they access the module and the method they use to extract confidential information. We identified that traditional prevention mechanisms for SC attacks are not appropriate for prevention of cross-VM cache-based SC attacks. We also proposed countermeasures for the prevention of these attacks in order to improve security in CC.

14.Healthcare design patterns -An internet of things approach

Author:Periyasamy,K.;Wan,K.;Alagar,V.

Source:Proceedings of the 32nd International Conference on Computers and Their Applications, CATA 2017,2017,Vol.

Abstract:The emerging Internet of Things (IoT) paradigm offers great promise for creating a global Internetbased architecture connecting humans, autonomous mobile devices, sensor networks, medical devices, and cloud computing to provide context-Aware solutions to public health whenever and wherever healthcare services are demanded. Two of the main critical areas of significance in such Healthcare IoT (HIoT) are Inhouse healthcare management for elderly people and healthcare provision in remote areas where hospital facilities do not exist. From software engineering principles for constructing a trustworthy HIoT, it is essential that the "things" in the system are dependable and reusable and the design remains extendable. This in turn will maximize the quality of service and minimize the cost of service provisioning. Motivated by this vision, this paper investigates the notion of Healthcare Design Pattern(HDP) and explains how the HDPs can be the building blocks for cyber-enabled healthcare solutions in HIoT. Three specific examples of HDPs for In-house healthcare solutions are described.

15.EAP and Occupations

Author:Bin, Z;Cheng, C;Hsu, WC

Source:JOURNAL OF ASIA TEFL,2017,Vol.14

16.The Making of the Chinese Middle Class: Small Comfort and Great Expectations

Author:Goodman, DSG

Source:CHINA QUARTERLY,2017,Vol.231

17.An improved method for predicting discharge of homogeneous compound channels based on energy concept

Author:Tang, XN

Source:FLOW MEASUREMENT AND INSTRUMENTATION,2017,Vol.57

Abstract:Accurate estimation of flow discharge in a compound river channel is increasingly important in river management and hydro-environment design. In this paper, a new model is developed to improve the prediction of flow based on Energy Concept Method (ECM) and Weighted Divided Channel Method (WDCM) along with the apparent shear stress at the interface between main channel and floodplain. The new model is compared with a wide range of our experimental data and the data available in the literature. The 27 datasets used include homogenous symmetric channels (22 datasets) and asymmetric channels (5 datasets) with various aspect ratios [channel total width (B) at bankfull / main channel bottom (b) =1.5-15.8], and bed slopes (S-0 = 4.3 x 10(-4)-1.3 x 10(-2)). It was found that the new model has significantly improved the accuracy of flow prediction compared with the traditional Divided Channel Method (DCM), and has also considerably better results than the ECM and WDCM methods against all the datasets, particularly for relatively low flow depths of floodplain where the flow discharges are most difficult to predict correctly. The new model predicts the total discharge well for both symmetric and asymmetric channels, within an averaged relative error of about 5%%.

18.Practice and Exploration of Discovery Tool Embedded in Learning Management System

Author:Wang Jun;Yang Liping;Bi Xin

Source:新世纪图书馆,2017,Vol.

Abstract:This paper introduces roles of academic libraries in learning management system, and takes Xi’an Jiaotong-Liverpool University Library as an example to illustrate the practice of discovery tool embedded in learning management system. By analyzing the concrete forms and operating mechanism of library resources and services embedded in the user learning environment, this paper reveals the opportunities and challenges faced by the library in the exploration process.

19.P2X7 receptor regulates CSD and CSD-induced TNF-alpha induction

Author:Ma, DQ;Bu, F;Jiang, LW;Quinn, JP;Wang, MY

Source:CEPHALALGIA,2017,Vol.37

20.SmallClient for big data: an indexing framework towards fast data retrieval

Author:Siddiqa, A;Karim, A;Chang, V

Source:CLUSTER COMPUTING-THE JOURNAL OF NETWORKS SOFTWARE TOOLS AND APPLICATIONS,2017,Vol.20

Abstract:Numerous applications are continuously generating massive amount of data and it has become critical to extract useful information while maintaining acceptable computing performance. The objective of this work is to design an indexing framework which minimizes indexing overhead and improves query execution and data search performance with optimum aggregation of computing performance. We propose SmallClient, an indexing framework to speed up query execution. SmallClient has three modules: block creation, index creation and query execution. Block creation module supports improving data retrieval performance with minimum data uploading overhead. Index creation module allows maximum indexes on a dataset to increase index hit ratio with minimized indexing overhead. Finally, query execution module offers incoming queries to utilize these indexes. The evaluation shows that SmallClient outperforms Hadoop full scan with more than 90%% search performance. Meanwhile, indexing overhead of SmallClient is reduced to approximately 50 and 80%% for index size and indexing time respectively.
Total 536 results found
Copyright 2006-2020 © Xi'an Jiaotong-Liverpool University 苏ICP备07016150号-1 京公网安备 11010102002019号