The comparison theorem for Bergman and Kobayashi metrics on Cartan-Hartogs domain of the second type

In this paper, the holomorphic sectional curvature under invariant metric on a Cartan-Hartogs domain of the second type YII(N,p,K) is presented and an invariant K?]lher metric which is complete and not less than the Bergman metric is constructed, such that its holomorphic sectional curvature is bounded above by a negative constant. Hence a comparison theorem for the Bergman and Kobayashi metrics on YII(N,p,K) is obtained.     

ON LIE ALGEBRAS WITH A CYCLIC NILPOTENT DERIVATION

A derivation of a Lie algebra is said to be cyclic nilpotent, if, as a linear transformation, it is cyclic nilpotent, i. e, its index of nilpotency is equal to the dimension of the algebra. A Lie algebra with such a derivation is called a 2-algebra. In this paper, the structure of s-algebras over an arbitrary field of characteristic zero is investigated.This paper can bs divided into two parts. In the first part, the following two main theorems are proved.     

Block-based test data adequacy measurement criteria and test complexity metrics

On the basis of software testing tools we developed for progrmnming languages, we firstly present a new control flowgraph model based on block. In view of the notion of block, we extend the traditional program-based software test data adequacy measurement criteria, and empirically analyze the subsume relation between these measurement criteria. Then, we define four test complexity metrics based on block. They are J-complexity 0; J-complexity 1 ; J-complexity 1 ; J-complexity 2. Finally, we show the Kiviat diagram that makes software quality visible.     

A NEW CLASS OF NON-NORMAL SIMPLE LIE ALGEBRAS OVER AN ARBITRARY FIELD

The structure of Lie algebras over an arbitrary field has not yet been determined. Except the well-known four types of simple Lie algebras A, B,C, D over an arbitrary field, Witt discovered a new class of simple Lie algebras over an arbitrary field. Recently Kaplansky extended the definition of Witt algebras. The author, under the supervision of Mr. Nieh Ling-chao, further extends the definition and obtains a new class of non-normal simple Lie algebras over an arbitrary field.     

某些紧致齐性空间上非黎曼的Einstein-Randers度量

The homogeneous spaces E7/SU ( 6 ) and E7/SU ( 2 ) are proved to admit invariant Einstein metrics, and then it's shown that they admit non-Riemannian Einstein-Randers metrics.     

Predicting the maintainability of open source software using design metrics

This paper empirically investigates the relationships between 15 design metrics and maintainability of 148 Java open source software. The results show that size and complexity metrics are strongly related to the maintainability of open source software. However, cohesion and coupling, as currently captured by existing metrics, do not seem to have a significant impact on maintainability. When used together, these metrics can predict system maintainability fairly accurately （mean MREs below 30%）.     

Modeling and Analyzing the Performance of High-Speed Packet I/O

Recently, 10 Gbps or higher speed links are being widely deployed in data centers. Novel high-speed packet I/O frameworks have emerged to keep pace with such high-speed links. These frameworks mainly use techniques, such as memory preallocation, busy polling, zero copy, and batch processing, to replace costly operations(e.g., interrupts, packet copy, and system call) in native OS kernel stack. For high-speed packet I/O frameworks,costs per packet, saturation throughput, and latency are performance metrics that are of utmost concern, and various factors have an effect on these metrics. To acquire a comprehensive understanding of high-speed packet I/O, we propose an analytical model to formulate its packet forwarding(receiving–processing–sending) flow. Our model takes the four main techniques adopted by the frameworks into consideration, and the concerned performance metrics are derived from it. The validity and correctness of our model are verified by real system experiments. Moreover, we explore how each factor impacts the three metrics through a model analysis and then provide several useful insights and suggestions for performance tuning.     

Dimensional Properties and Stretchability of Cotton Interlock with Missing Needle Fabrics

The dimensional properties and uniarial stretchability of cotton interlock and interlock with missing needle are discussed on the basis of definition system for double knits. K values used widely to describe the dimensional properties of plain knitted structures are developed into the study of double knitted structures in this paper. K values are not constants, the numerical values of which will depend on the actual configuration of various knitted structures. It is suggested that the effect of knitted structures on dimensional properties and stretchability can be described by K values.     

Lie Bialgebra Structures on Generalized Heisenberg-Virasoro Algebra

In a recent article by Liu,Pei,and Zhu,Lie bialgebra structures on the twisted Heisenberg-Virasoro algebra were determined. By disposing the indexing set, the generalized Heisenberg-Virasoro algebra was considered. It is proved that all Lie bialgebra structures on centerless generalized Heisenberg-Virasoro algebra L are coboundary triangular by proving that the first cohomology group H1 （L,V） =0.     

Possibility of using strain F9（Serratia marcescens） as a bio-collector for hematite flotation

In this study, we characterized strain F9 and evaluated the interaction between strain F9 and hematite by scanning electron microscopy（SEM）, Fourier transform infrared spectrophotometry（FTIR）, zeta potential, flotation, and other methods. The results showed that strain F9 belongs to Serratia marcescens. This brevibacterium had CH2, CH3, and hydroxyl groups on its cell wall, which imparted a strong hydrophobic and negative charge. Adsorption of strain F9 reduced the zeta potential of the hematite surface and increased the hydrophobicity of the hematite surface, thereby generating hydrophobic hematite agglomerates. At least four groups on strain F9 interacted with the hematite surface, which contributed to chemical interactions of carboxylic groups and hydrophobic association among hydrophobic hematite particles. The possible use of strain F9 as a bio-collector for hematite flotation was proved.     

Crocin Synthesis Mechanism in Crocus sativus

Saffron （Crocus sativus） cells can synthesize crocin, crocetin digentiobiosyl ester, in suspension cultures. The crocin family biosynthesis mechanism was studied using high pressure liquid chromatography （HPLC） to determinate the glucosyltransferase activity and to develop a method for synthesizing medicine from saffron cells. Previous studies indicated that two glucosyltransferases might be involved in the formation of crocetin glucosyl- and gentiobiosyl-esters. GTasel formed an ester bond between crocetin carboxyl groups and glucose moieties while GTase2 catalyzed the formation of glucosidic bonds with glucosyl ester groups at both ends of the molecule. These enzymes can catalyze the formation of crocetin glucosides in vitro. GTasel activity is higher during the first four days of crocin glucosides biosynthesis, but decreases after four days. The formation and accumulation of crocin increase during the first six days and stabilized on the eighth day.     

Gradient Analysis of Urbanization Pattern Based on Class-level Landscape Metrics for Shanghai Region

The spatial pattern of urbanization in the Shanghai metropolitan area is quantified with GIS-based land use data set and gradient analysis of landscape metrics. A number of landscape metrics were computed along a 64 km long and 6 km wide west-east transect and another 66 km long and 6 km wide south-north transect. The results of transect analysis with class-level metrics showed that the spatial pattern of urbanization could be reliably quantified using landscape metrics with a gradient analysis approach, and the location of the urbanization center could be identified precisely and consistently with multiple indices of the landscape metrics used in this study. Different land use types exhibited distinctive, but not necessarily unique, spatial signatures that were dependent on specific landscape metrics. These results seemed to characterize the urban core of the Shanghai metropolitan area rather accurately and precisely: Agriculture patches were abundant and less fragmented; the urban land use types were extensive, having many small patches and highly fragmented.     

齐性空间 E6/SU(5)与 E6/SU(2)上非黎曼的Einstein-Randers度量(英文)

The homogeneous spaces E ₆ /SU (5) and E ₆ /SU (2) are firstly proved to admit invariant Einstein metrics. And then it's shown that they admit non-Riemannian Einstein-Randers metrics.     

One-dimensional nano-structure of Cu-Zn-Al alloy

Cu-Zn-Al alloy of one dimensional nano-structure was prepared and the structure of obtained nano-material was characterized by transmission electron microscope (TEM). It was shown that there are non-linear oscillations on the surface of Cu-Zn-Al alloy and the consanguineous connection exists between non-linear oscillation and the growth process of one dimensional nano-structure. The diameter of one dimensional nano-structure is about 40 nm, and the ratio of length to diameter is over 40. Finally, the growth mechanism of one dimensional nano-structure was also studied.     

Cost of Multicast Logical Key Tree Based on Hierarchical Data Processing

How to design a multicast key management system with high performance is a hot issue now. This paper will apply the idea of hierarchical data processing to construct a common analytic model based on directed logical key tree and supply two important metrics to this problem： re-keying cost and key storage cost. The paper gives the basic theory to the hierarchical data processing and the analyzing model to multieast key management based on logical key tree. It has been proved that the 4-ray tree has the best performance in using these metrics. The key management problem is also investigated based on user probability model, and gives two evaluating parameters to re-keying and key storage cost.     

A Novel DBN-EFA-CFA-Based Dimensional Reduation for Credit Risk Measurement

Affected by the Federal Reserve’s interest rate hike and the downward pressure on the domestic economy, the phenomenon of default is still prominent. The credit risk of the listed companies has become a growing concern of the community. In this paper we present a novel credit risk measurement method based on a dimensional reduation technique. The method first extracts the risk measure indexes from the basal financial data via dimensional reduation by using deep belief network(DBN), exploratory f...     

Effect of microstructure and surface chemistry in liquid-phase adsorptive nicotine by almond-shell-based activated carbon

The effect of microstructure and surface chemistry on nicotine adsorption capacity of almond-shell-based activated carbon was studied.Almond-shell-based activated carbon was reactivated or modified with steam,ZnCl2and NaHSO4separately.The surface area and pore structure parameters of activated carbon were determined from the adsorption-desorption isotherm of nitrogen at 77K.Boehm titration and FTIR were explored to determine the surface oxygen groups.The results revealed that nicotine adsorption from solution on carbons depend on the micropores and phenolic groups.A strong correlation between the amounts of adsorbed nicotine and the phenolic groups was observed,whereas the higher amounts of carboxylic groups decrease the nicotine adsorption capacity on activated carbons.     

Phase-Plane Invariant Analysis of Pressure Fluctuations in Fluidized Beds

Partial agglomeration is a major problem in fluidized beds. A chaotic analytical method based on the phase-plane invariant of the pressure fluctuations in the fluidized beds has been used to warn of ag-glomeration at an early stage. Cold tests (no combustion) and hot tests (combustion) in fluidized beds show that the phase-plane invariant of the pressure fluctuations can distinguish the dynamic behavior of fluidized beds with different flow rates in cold tests. With combustion, when the flow rate was kept constant, agglom-eration was detected very early by looking at the phase-plane invariant. The phase-plane invariant can be used to distinguish changes in fluidized beds due to changes in the flow rate, agglomeration, or various other factors. Therefore, this reliable agglomeration early warning system can be used for better control of circulating fluidized beds.     

Measurement of corneal astigmatism

Cornea is the most important optical surface in the eye dioptric system. Three kinds of methods in measuring corneal astigmatism were used. Three hundred and sixty eyes suffered ametropia were selected on a random basis. Computer_assisted corneal topographic system was compared with keratometer and cycloplegic retinoscopy in measuring corneal curvature. There was no statistical difference in axes of astigmatism among the three groups. It is thought that ΔSim \%K\% could show the corneal regular astigmatism. As for diopters of astitigmatism, no difference was found between the groups of corneal topography and keratometer, but there was a significant difference between the group of cycloplegic retinoscopy and the other two groups. It was demonstrated that keratometer could function similarly as the corneal topography. However, it measured only four points from a small region of the cornea and was limited in measuring slight changes in corneal curvature. Some discussion was also made about the graphic patterns and ΔSim \%K\% in corneal topography.     

Preparation Process and Mechanical Properties of PLA/PCL Intravascular Stent

A hand-made biodegradable intravascular stent with zig- zag structure has been developed, which made from polylactic acid （ PLA ） braided thread and poly-eaprolactone （ PCL ） tube. This paper showed the preparation process of the PLA braded thread and stent, and discussed the heat setting process of the stents. The sixteen groups of stents were made for the heat setting experiments, discussing two factors on four levels. Radial compression behavior of stents was tested by plate compression method. The result showed that both the heat setting temperature and time had significant effects on stent compression strength. The compression recovery rate was mainly affected by heat setting temperature. The optimized heat setting condition should be 90-100℃ for 45 rain.