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Search Results: 1 - 10 of 69556 matches for " Xia Yang "
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Direct Visualisation of the Depth-Dependent Mechanical Properties of Full-Thickness Articular Cartilage  [PDF]
Matthew Szarko, Yang Xia
Open Journal of Orthopedics (OJO) , 2012, DOI: 10.4236/ojo.2012.22007
Abstract: Objective: The structural anisotropy of articular cartilage controls its deformation response. As proteoglycans and collagen vary with depth, simple uniaxial compression results in inhomogeneous deformation with distinct depth-dependent mechanical properties. Investigations into depth-dependent mechanical properties of articular cartilage have previously required tissue modification after specimen isolation. Such modifications include histological processes, freezing, subchondral bone removal, and fluorescent staining that may alter the tissue, limiting in vivo applicability. Design: Using a custom tissue-sectioning device, 0.1 mm thick unfixed, unstained, osetochondral samples were obtained. A customized apparatus loaded samples to 12.5%, 24%, and 29% compression in under a microscope with 10× magnification. Equilibrium load was measured after stress relaxation. Intra-tissue displacement was measured by tracing groups of cells between the different compression levels using a digital imaging program. Cell distance from the subchondral bone was measured to identify intratissue displacement and calculate strain. Results: The results reveal that stress levels and intratissue displacement increased with greater tissue compression (p < 0.05). Intra-tissue displacement decreased as depth from the articular surface increased (p < 0.01). This occurred for each level of tissue compression. Overall compressive resistance is seen to increase with depth from the articular surface. Conclusions: The current study identifies a method directly visualising and assessing the depth-dependent structural response to compression. The ability to avoid tissue modification after specimen isolation, allows this procedure to more closely approximate in vivo conditions and may provide an important method for analyzing the coordinated changes in cartilage composition and function due to ageing and disease.
Hierarchical Coordinated Control for Power System Voltage Using Linear Temporal Logic  [PDF]
Hongshan ZHAO, Hongliang GAO, Yang XIA
Engineering (ENG) , 2009, DOI: 10.4236/eng.2009.12014
Abstract: The paper proposed an approach to study the power system voltage coordinated control using Linear Temporal Logic (LTL). First, the hybrid Automata model for power system voltage control was given, and a hierarchical coordinated voltage control framework was described in detail. In the hierarchical control structure, the high layer is the coordinated layer for global voltage control, and the low layer is the power system controlled. Then, the paper introduced the LTL language, its specification formula and basic method for control. In the high layer, global voltage coordinated control specification was defined by LTL specification formula. In order to implement system voltage coordinated control, the LTL specification formula was transformed into hybrid Automata model by the proposed algorithms. The hybrid Automata in high layer could coordinate the different distributed voltage controller, and have constituted a closed loop global voltage control system satisfied the LTL specification formula. Finally, a simple example of power system voltage control include the OLTC controller, the switched capacitor controller and the under-voltage shedding load controller was given for simulating analysis and verification by the proposed approach for power system coordinated voltage control. The results of simulation showed that the proposed method in the paper is feasible.
Recent Advances in Machine-to-Machine Communications  [PDF]
Nian Xia, Chu-Sing Yang
Journal of Computer and Communications (JCC) , 2016, DOI: 10.4236/jcc.2016.45016
Abstract:

In the near future, there are expected to have at least billions of devices interconnected with each other. How to connect so many devices becomes a big issue. Machine-to-Machine (M2M) communications serve as the fundamental underlying technologies to support such Internet of Things (IoT) applications. The characteristics and services requirements of machine type communication devices (MTCDs) are totally different from the existing ones. Existing network technologies, ranging from personal area networks to wide area networks, are not well suited for M2M communications. Therefore, we first investigate the characteristics and service requirements for MTCDs. Recent advances in both cellular and capillary M2M communications are also discussed. Finally, we list some open issues and future research directions.

Portfolio Performance on Agency Mechanism with Capability of Manager  [PDF]
Haijun Yang, Wei Xia, Jian Fu
Theoretical Economics Letters (TEL) , 2018, DOI: 10.4236/tel.2018.81002
Abstract: By given different capabilities of managers, a novel model of optimal contracting is proposed in agency problems, which adds a new variable denoted by the manager’s ability in delegated portfolio management. Then we compare our results with Dybvig and Farnsworth’s (2010) and find a new effect by appending this variable. The results show that in the first-best situation with log utility, the optimal contract is in accord with the result of Dybvig and Farnsworth’s (2010). In the second-best situation, the optimal contract is a proportional sharing rule plus a bonus. However, the bonus is associated with variables including private signals and the manager’s ability. In the third-best situation, the manager’s share is no longer a constant; and the manager’s fee is no longer a linear combination of the returns, which depends on the signal and the manager’s ability. So manager’s ability is an important variable for the market return. We can also find that these institutional features are more similar to practice than other existing agency models and consistent with the reality of the situation. The numerical results also verify the solutions.
Physiochemical Properties, Volatile Compounds and Sensory Evaluation of Chili Sauce Shrimp Paste from Different Regions in Indonesia  [PDF]
Wildan Suhartini, Fang Yang, Wenshui Xia
Food and Nutrition Sciences (FNS) , 2019, DOI: 10.4236/fns.2019.103026
Abstract: Chili sauce shrimp paste (CSSP) is an exotic traditional sauce prepared using mainly fresh chili and shrimp paste well known as sambal terasi (Indonesia) and sambal belacan (Malaysia and Brunei). This study aims to evaluate CSSP from different regions in Indonesia on physiochemical properties, volatile compounds, and sensory evaluation. Evaluation in free amino acid (FAA) and volatile compounds were analyzed using HPLC and GC-MS. CSSP had no significant (p > 0.05) on proximate (except for moisture), salinity, pH, microbial counts and the redness index (a*/b*) compared to control. The identified volatiles can be grouped into hydrocarbon, carbonyl, sulfur, alcohol, nitrogen, fatty acid, and ester compounds. The CSSP A, B, C, D, and E (control) contained 9, 21, 12, 29, and 6 volatile compounds respectively. The total FAA ranged from 44.32 to 67.03 g/100 g, and histidine (his) was found as the most abundant in each CSSP. The rheological properties (yield stress, viscosity, and consistency) of CSSP and control values were significantly, except for CSSP B. The intensities perceived of saltiness, sweetness, and bitterness were greatly varied among CSSP. Although there is no correlation between sweetness and bitterness this is indicated by the negative correlation.
Difluoro[2-(quinolin-2-yl)phenolato]borane
Xi Yang,Min Xia
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811011895
Abstract: The title compound, C15H10BF2NO, was synthesized by the reaction of 2-(quinolin-2-yl)phenol and boron trifluoride etherate. The quinoline ring system and the benzene ring are twisted, making a dihedral angle of 8.3 (2)°. In the crystal, π–π interactions between the aromatic rings [centroid–centroid distance = 3.638 (9) ] link the molecules into chains propagating in [100].
The Neo-Pagan God of Modern Humanism in Disgrace
Xia WANG,Nan YANG
Studies in Literature and Language , 2010,
Abstract: Disgrace, published in 1999, is set in the post-apartheid South Africa. After its publication, many critics read the novel as a response to the current political affairs of South Africa: the whites seeking a way to reconcile with the blacks in the new South African land. Besides, the novel is also read as an existential novel. Many critics are concerned with Lurie’s personal growth in which animals play an important transformative role: dogs make Lurie aware of the suffering of beings. Lurie is thus entitled as a “dogman,” a “scapegoat,” or a “scapegrace.” However, all of these critics neglect one trait of Lurie, that is, he is actively inventing his own perverse life rather than life transforms him. He willfully woos one of his students thirty years younger than him. Afterwards, he asserts his right of desire and refuses to repent for his sexual harassment on his student. Finally he determinedly chooses to become a dogman in the rural land of South Africa. In the fifth chapter of his 2003 novel Elizabeth Costello titled “The Humanity in Africa,” Coetzee expresses his view of Humanism which, I found, can shed a light on interpreting the protagonist Lurie’s character in Disgrace. In “The Humanity in Africa,” Coetzee suggests that Greek-Renaissance Humanism and Judean-Christianity have been rivaling, yet at the same time miming each other. Modern Humanism is usually regarded to be originated from Greek civilization as opposed to Christianity, yet, Coetzee suggests, it incorporates the two European civilizations: it follows the Greeks to pursue human beauty and also learns caritas from Christianity. Human pride is the backbone of Modern Humanism, which makes men their own gods: Human beings assert their human subjectivity and pursue human beauty and at the same time assume the role of Christ to suffer as a human flesh and suffer for others. In this thesis, I argue that one of the protagonist Lurie’s remarkable traits is that he, inspired by his human pride, willfully self-invents his perverse life. Lurie’s pride is actually a pride of a Modern Humanist, which drives him to completely pursue human beauty and endows him with the strength to willingly suffer human disgrace. Lurie’s human pride is so strong that it grants Lurie’s absolute sovereign self and elevates him to a Neo-Pagan God of Modern Humanism. Keywords: Human Pride; Greek Humanism; Judean-Christianity; Beauty and Ugliness
An Innovative Research on the Cultivation Pattern of Human Resources Management Professionals
Xia Cui,Yang Lu
Asian Social Science , 2009, DOI: 10.5539/ass.v4n5p65
Abstract: With the approaching era of knowlege-based economy as well as the gradual universalization of China’s higher education, the quantity issue in talent cultivation has given way to the quality one consequently. Setting out from some problems in the cultivation of human resources management professional in China, this article puts forward patterns for objectives, curriculum systems as well as teaching methods in innovative talent cultivation.
A note on the sign (unit root) ambiguities of Gauss sums in index 2 and 4 cases
Jing Yang,Lingli Xia
Mathematics , 2009, DOI: 10.1007/s11464-012-0217-2
Abstract: Recently, the explicit evaluation of Gauss sums in the index 2 and 4 cases have been given in several papers (see [2,3,7,8]). In the course of evaluation, the sigh (or unit root) ambiguities are unavoidably occurred. This paper presents another method, different from [7] and [8], to determine the sigh (unit root) ambiguities of Gauss sums in the index 2 case, as well as the ones with odd order in the non-cyclic index 4 case. And we note that the method in this paper are more succinct and effective than [8] and [7].
Complete Solving for Explicit Evaluation of Gauss Sums in the Index 2 Case
Jing Yang,Lingli Xia
Mathematics , 2009, DOI: 10.1007/s11425-010-3155-z
Abstract: Let $p$ be a prime number, $q=p^f$ for some positive integer $f$, $N$ be a positive integer such that $\gcd(N,p)=1$, and let $\k$ be a primitive multiplicative character of order $N$ over finite field $\fq$. This paper studies the problem of explicit evaluation of Gauss sums in "\textsl{index 2 case}" (i.e. $f=\f{\p(N)}{2}=[\zn:\pp]$, where $\p(\cd)$ is Euler function). Firstly, the classification of the Gauss sums in index 2 case is presented. Then, the explicit evaluation of Gauss sums $G(\k^\la) (1\laN-1)$ in index 2 case with order $N$ being general even integer (i.e. $N=2^{r}\cd N_0$ where $r,N_0$ are positive integers and $N_03$ is odd.) is obtained. Thus, the problem of explicit evaluation of Gauss sums in index 2 case is completely solved.
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