岩体力学参数确定的GA-FLAC~(3D)位移反演方法

在矿产资源开采、采矿设计及施工、地下结构物稳定性预测等岩土工程领域中,初步的也是重要的研究课题之一是确定岩体力学参数。经过综合分析多种岩体力学性质反演法,提出了一种智能位移反演方法。首先,在工程经验和GSI体系的基础上选定待反演的岩体力学参数的数值范围,通过巷道现场位移量测获得拱顶下沉和水平收敛位移。然后,运用遗传算法(GA)与FLAC3D数值模拟软件相结合,进行位移反演,确定比较正确的岩体力学参数。根据上述方法采用VC++高级程序语言开发了将遗传算法与FLAC3D软件相结合的位移反演系统,以某铅锌矿体和上下盘岩体为例,进行了矿岩体力学参数反演。进行与其他反演法的对比分析,证明了该方法的正确性和实用性。     

Determination of S‐methyl‐L‐methionine (SMM) from Brassicaceae Family Vegetables and Characterization of the Intestinal Transport of SMM by Caco‐2 Cells

The objectives of the current study were to determine S‐methyl‐L‐methionine (SMM) from various Brassicaceae family vegetables by using validated analytical method and to characterize the intestinal transport mechanism of SMM by the Caco‐2 cells. The SMM is well known to provide therapeutic activity in peptic ulcers. The amount of SMM from various Brassicaceae family vegetables ranged from 89.08 ± 1.68 μg/g to 535.98 ± 4.85 μg/g of dry weight by using validated ultra‐performance liquid chromatography‐electrospray ionization‐mass spectrometry method. For elucidating intestinal transport mechanism, the cells were incubated with or without transport inhibitors, energy source, or a metabolic inhibitor. Phloridzin and verapamil as inhibitors of sodium glucose transport protein (SGLT1) and P‐glycoprotein, respectively, were not responsible for cellular uptake of SMM. Glucose and sodium azide were not affected by the cellular accumulation of SMM. The efflux ratio of SMM was 0.26, implying that it is not effluxed through Caco‐2 cells. The apparent coefficient permeability (P _app) of SMM was 4.69 × 10^?5 cm/s, indicating that it will show good oral absorption in in vivo .     

Nonisothermal crystallization kinetics of poly(etheretherketone) (PEEK)

Analysis of the crystallization kinetics of poly(etheretherketone) (PEEK) was achieved with dynamic differential scanning calorimetry results. A new kinetic model for the nonisothermal crystallization was derived and the possibility of its application was investigated. By evaluating the parameters in the model, the crystallization behavior of PEEK was analyzed. The experimental and predicted crystallinity change showed good agreement, which indicated that the model equation was appropriate to describe the nonisothermal crystallization kinetics of PEEK. As the melt temperature was increased the number of heterogeneous nuclei decreased, hence the crystallization was delayed.     

Valid transformations: a new class of loop transformations forhigh-level synthesis and pipelined scheduling applications

In this paper we present a new class of loop optimizing transformations called valid transformations, which are suitable for fine-grain parallelization applications such as high-level synthesis of VLSI designs or compilers for super-scalar or VLIW machines. This class of transformations are different from existing ones in that valid transformations can be illegal. Nevertheless, if a transformation is valid, the transformed loop has a feasible pipeline schedule. We present an example valid transformation called loop expansion which can help produce cost-performance efficient designs and explore a larger design space for a satisfactory design. Several examples are used to demonstrate the efficacy of the proposed technique     

Cavity length dependence of high-speed 1.55-/spl mu/m multiple-quantum-well laser diode characteristics

Spontaneous emission spectra below threshold were measured from the side wall of InGaAs QW laser diodes to extract laser design parameters such as cavity length dependence of gain, linewidth enhancement factor, and serial resistance. The threshold current varies according to the change of cavity length, and thus, the lasing peak shifts and the serial resistance changes. It is interesting that the linewidth enhancement factor, however, is not deteriorated by shortening cavity length. The short cavity length would rather improve the linewidth enhancement factor mainly by shifting the lasing peak to smaller wavelength side, where the linewidth enhancement factor is inherently low.     

A thermoanalytical study on solid-state cure of poly(p-phenylene sulfide)

Differential scanning calorimetry (DSC) was used to investigate the solid-state cure process of poly(phenylene sulfide)(PPS) resin. Virgin PPS resin in an open sample pan was cured in DSC cell. Either air or oxygen was used as a curing atmosphere. Cure temperatures were in the range of 200 and 250 °C, which are below the melting point of PPS resin. Cure temperature as well as atmospheric condition influenced the cure behavior of PPS in the solid state. Both the rate and the amount of cure increased with increasing cure temperature. On the other hand, the time to reach the maximum cure rate was independent of cure temperature. Changing the atmosphere from air to oxygen increased both the cure rate and the amount of cure. The size effect of PPS particles on the cure reaction was also discussed.     

Global scheduling with code-motions for high-level synthesisapplications

In this paper, we present a global scheduling technique for synthesis applications. The algorithm accepts a specification containing conditional branches and while-loop constructs and schedules it for a given set of resources. The algorithm performs several types of code motions across different basic blocks and trades off cost with performance. Several real-life examples taken from Numerical Recipes in C are used to demonstrate the efficacy of the approach. The results indicate that code-motions are very important for achieving significant speed-ups for synthesis applications     

Charge–discharge curves and discharge capacities of LiNi1−yCoyO2 synthesized from lithium carbonate and nickel and cobalt oxides

LiNi_1?yCo_yO₂ (y=0.1, 0.3, and 0.5) were synthesized by a solid-state reaction method at 800 °C and 850 °C using Li₂CO₃, NiO, and Co₃O₄ as the starting materials. The electrochemical properties of the synthesized LiNi_1?yCo_yO₂ were then investigated. For samples with the same composition, the particles synthesized at 850 °C were larger than those synthesized at 800 °C. The particles of all the samples synthesized at 850 °C were larger than those synthesized at 800 °C. LiNi_0.5Co_0.5O₂ synthesized at 850 °C had the largest first discharge capacity (159 mA h/g), followed in order by LiNi_0.7Co_0.3O₂ synthesized at 800 °C (158 mA h/g) and LiNi_0.9Co_0.1O₂ synthesized at 850 °C (151 mA h/g). LiNi_0.9Co_0.1O₂ synthesized at 850 °C had the best cycling performance with discharge capacities of 151 mA h/g at n=1 and 156 mA h/g at n=5.     

Efficient phosphorescent white organic light-emitting diodes using Ir(4-Me-2,3-dpq)2(przl-C6H4F) as a red emitter

We demonstrated white organic light-emitting diodes (WOLED) using the iridium bis(4-methyl-2,3-phenylquinolinato-N,C2) fluorophenylpyrazolonate complex (Ir(4-Me-2,3-dpq)2(przl-C6H4F)) as a phosphorescent red dopant and iridium bis[(4,6-difluorophenyl)-pyridinato-N,C2] picolinate (Flrpic) as a phosphorescent blue dopant. The WOLED with Ir(4-Me-2,3-dpq)2(przl-C6H4F) had better exciton confinement in emitting layer and indicated smaller movement of exciton than the WOLED with iridium bis(2-phenylquinoline) acetylacetonate (Ir(2-pq)2(acac)) as phosphorescent red dopant. The optimized WOLED had a peak external quantum efficiency of 7.16%, current efficiency of 11.84 cd/A, and Commission Internationale de l'Eclairage (CIE(x,y)) coordinates of (0.35, 0.32). The WOLED also exhibited the minimal change with delta CIE(x,y) coordinates of +/- (0.01, 0.00) from 100 to 4000 cd/m2.     

Analysis and design of long-stroke linear actuators

This paper proposes a design method of a long-stroke linear actuator used for vertical lifting. The long-stroke linear actuator is a type of linear actuator that comprises a pair of springs. A spiral spring called “the windup spring” engages teeth on a tooth spring called“ the toothed coil spring”, thereby forming a solid column and transferring a high power and large displacement while stored by a small assembly located at the base of the column. Working performance of the designed linear actuator is verified through simulation and experiments.