Room temperature near-infrared tunable Cr:La3Ga5SiO14 laser

Laser operation was achieved in a Cr-doped crystal of La₃ Ga₅SiO₁₄. The laser had a free-running wavelength of 960 nm at room temperature from 862 to 1107 nm. Up to 80 mW output power has been measured with 1.5 W of pump power absorbed from a krypton ion laser. The ⁴T₂ fluorescence spectrum showed a peak at 890 nm indicating an unusually large Franck-Condon shift. At room temperature the fluorescence lifetime was 5.3 μs and the fluorescence quantum yield was measured to be about 14%     

Hardware fault latency: Problem formulation and solution

A fault does not necessarily cause an immediately effective error, thereby leading to a system failure. Many experiments have shown that most hardware faults do not cause immediately detectable errors. In fact, it has been found that a significant proportion of the faults injected during the experiments remained latent, i.e. went undetected. In this paper we call this phenomenon the latency problem. An analytical model is developed in the paper to study the effects of the latency problem on fault-tolerant computer systems. Some of the results of our sensitivity analysis are presented and discussed.     

地震岩性横向变化的划分——自回归模式识别的应用

假设地震记录道可视为一个离散的时间序列,并认为它是一个包含各种信息的高维样本空间,利用自回归模式识别方法,在信息量损失最小的条件下,求取样本空间的特征系数,可使维数大大降低,按层计算出所有地震道的特征系数,利用多种距离准则,在层内对它们进行划分.对划分出的各部分利用模糊聚类方法进行聚类,实现了层内岩性横向变化的划分和分类.用理论模型对本方法进行了验证,并将它应用于实际地震剖面处理,获得了满意的效果.     

A general stability theorem for linear discrete-time systems

The strongest sufficient conditions for constraining zeros to be on or within a circular region in thezplane in terms of weighted absolute norms are derived using elementary geometry. It is shown that the weighted L1norm yields the strongest result.     

Identification for systems with bounded noise

In this paper, we present a set-membership identification algorithm for systems with unknown but bounded disturbance. The algorithm contains a weighting factor which is selected according to whether the new observed data contains sufficient information. The proposed approach ensures that the estimation error is bounded and nonincreasing. Furthermore, it is shown that the parameter estimates provided by the algorithm will converge to a region containing the true parameters, and its upper bound is also given     

Ultrastructural characteristics of Lyme disease spirochetes (Borrelia burgdorferi) isolated from Ixodes persulcatus in China

Diluting composite materials with unfilled resin to facilitate clinical application during direct lamination will result in an alteration of filler loading with possible changes of physical properties. This study compared the surface hardness and abrasion resistance of a visible light-cured microfilled and hybrid resin with and without dilution. Samples were prepared, cured, and stored in distilled water at 37 degrees C for 24 hours before testing. Knoop hardness values were obtained from the upper surface of 10 samples in three dilution and control groups of each material. Three samples of the dilution and control groups were similarly prepared and stored for toothbrush abrasion testing. Data from the hardness and abrasion tests were subjected to analysis of variance and Tukey's test at a 0.05 level of significance. Results showed that dilution had a significant effect on surface hardness of the materials tested, although the diluted materials were not significantly different from the controls. Abrasion tests showed visible evidence of abrasion on all samples, but dilution showed no significant effect on abrasion resistance of the materials tested.     

修正容积法确定稠油蒸汽吞吐开发的合理井距

方法 应用计算油气进质储量计算方法－－容积法、对实际采油量及最科采油油量进行脱气原油体积收缩量校正。目的 确定和评价蒸汽吞吐开发的合理井距。结果 该方法综合考虑了蒸汽吞吐降压开采过程中溶解气油比和原油体积系数的变化，可确定不同蒸汽吞吐开发阶段的合理井距。结论修正容积法确定稠油蒸汽吞吐开发的合理吉距具有参数取简便，计算简单的特点，与井距研究的其它该当具有可靠性及有效性。     

Reconstruction of moderate sized intra-oral defects using the nasolabial flap

The nasolabial flap was used in 11 patients for reconstruction of moderate sized intra-oral defects. There was minimal morbidity of donor and recipient sites in terms of function and cosmesis. The flap was easily harvested, with a reduction in operating time. The superb vascularity and reliability of the flap was demonstrated by the fact that it was possible to use this flap even after a radical neck dissection had been performed on the same side or after radiotherapy. This article describes the authors' experience with the use of the subcutaneously-pedicled, inferiorly-based, double-staged nasolabial flap for intra-oral reconstruction.     

RP2基因的连锁分析定位

为寻找视网膜色素变性相关基因ＲＰ２所在的染色体位点，采用染色体ＸＰ２１．１－Ｐ１１．２区段的８个微卫星ＤＮＡ樯记。，对Ｘ－连锁ＲＰ家系进行连锁分析。     

Improved lower bounds on the reliability of hypercube architectures

The hypercube topology, also known as the Boolean n-cube, has recently been used for multiprocessing systems. The paper considers two structural-reliability models, namely, terminal reliability (TR) and network reliability (NR), for the hypercube. Terminal (network) reliability is defined as the probability that there exists a working path connecting two (all) nodes. There are no known polynomial time algorithms for exact computation of TR or NR for the hypercube. Thus, lower-bound computation is a better alternative, because it is more efficient computationally, and the system will be at least as reliable as the bound. The paper presents algorithms to compute lower bounds on TR and NR for the hypercube considering node and/or link failures. These algorithms provide tighter bounds for both TR and NR than known results and run in time polynomial in the cube dimension n, specifically, within time O(n²)