基于SVG搜索技术的研究与实现

在将SVG文档存入对象关系型数据库后，探讨了如何利用扩展SQL语句(SQL3/SQL99)进行搜索的方法；同时，讨论了将SVG文档存入本源数据库后，利用XQuery语句搜索的方法。研究表明，基于这两种数据库的SVG搜索，均可在客户端执行时大大提高搜索速度，且不需占用过多的系统资源。     

任务驱动法在Protel 99SE教学中的应用

Protel 99SE是进行印制电路板设计的首选软件。目前对该课程的教学而言,实操要求性强和课时分配少之间的矛盾成为其现存的主要矛盾。应用任务驱动法进行Protel 99SE的教学,可以在有限的教学时间内让学生更熟练地掌握该软件在实践中的应用。     

A new fundamental solution for differential Riccati equations arising in control

The matrix differential Riccati equation (DRE) is ubiquitous in control and systems theory. The presence of the quadratic term implies that a simple linear-systems fundamental solution does not exist. Of course it is well-known that the Bernoulli substitution may be applied to obtain a linear system of doubled size. Here, however, tools from max-plus analysis and semiconvex duality are brought to bear on the DRE. We consider the DRE as a finite-dimensional solution to a deterministic linear/quadratic control problem. Taking the semiconvex dual of the associated semigroup, one obtains the solution operator as a max-plus integral operator with quadratic kernel. The kernel is equivalently represented as a matrix. Using the semigroup property of the dual operator, one obtains a matrix operation whereby the kernel matrix propagates as a semigroup. The propagation forward is through some simple matrix operations. This time-indexed family of matrices forms a new fundamental solution for the DRE. Solution for any initial condition is obtained by a few matrix operations on the fundamental solution and the initial condition. In analogy with standard-algebra linear systems, the fundamental solution can be viewed as an exponential form over a certain idempotent semiring. This fundamental solution has a particularly nice control interpretation, and might lead to improved DRE solution speeds.     

Numerical optimal control of the wave equation: optimal boundary control of a string to rest in finite time

In many real-life applications of optimal control problems with constraints in form of partial differential equations (PDEs), hyperbolic equations are involved which typically describe transport processes. Since hyperbolic equations usually propagate discontinuities of initial or boundary conditions into the domain on which the solution lives or can develop discontinuities even in the presence of smooth data, problems of this type constitute a severe challenge for both theory and numerics of PDE constrained optimization.     

Preparation of layered nickel aluminium double hydroxide from waste solution of nickel

The separation of nickel has been carried out from a waste solution containing 3.18 g/L Ni with other impurities such as Fe, Zn, Cu and As. Iron was removed by precipitation and Cu and Zn were removed by solvent extraction using LIX 622N and NaTOPS-99, respectively. After removal of all these impurities nickel was extracted by 1.5 M NaTOPS-99 in two counter-current stages at A:O ratio of 3:1 and the loaded organic was stripped with 30 g/L H₂SO₄ at phase ratio of unity. The strip solution of nickel was treated with Al₂(NO)₃ · 9H₂O for co-precipitation by increasing the pH of solution with 1 M NaOH up to 10. The Ni–Al layered double hydroxide was confirmed through XRD characterization.     

Self determination-based design to achieve acceptance of assisted living technologies for older adults

Providing technological support to assist older adults in their daily activities is a promising approach to aging in place. However, acceptance is critical when technologies are embedded in the user's life. Recently, Lee et al. established a connection between acceptance and motivation. They approached motivation via the Self-Determination Theory (SDT): the capacity to make choices and to take decisions.This paper leverages SDT to promote a new design style for gerontechnologies that consists of principles and requirements. We applied our approach to develop an assisted living platform, which was used to conduct a six-month field study with 34 older adults. We show that self-determination is a determining factor of technology acceptance. Furthermore, our platform improved the self-determination of equipped participants, compared to the control group, suggesting that our approach is effective. As such, SDT opens up new opportunities for improving the design process of gerontechnologies.     

The pinhole SPECT for animal model of bone metastasis with SPC-A-1BM human pulmonary adenocarcinoma bone metastasis cell line

The study was to investigate the role of pinhole single photon emission computed tomography （SPECT）, the human pulmonary adenocarcinoma bone-seeking metastasis cell line SPC-A-1BM was used. These cells form typical osteolytic bone metastases when inoculated into the arterial circulation of NIH-Beige-Nude-XD （BNX） mice v/a the left ventricle. In order to evaluate the irradiation impact of ^99mTc-MDP versus X-ray on cells growth, we used six groups of SPC-A-IBM cells in our imaging scheme and irradiated by various doses of ^99mTc-MDP （37, 74, 111, 370, 740 MBq） and X-ray（40 kV, 2 mA, 6 s） respectively. The cell＇s number of each group was well recorded in different exposure time（ 4, 8, 12, 24, 48, 72, 96 hours ）. After that, SPC-A-1BM cells （1×106） were inoculated into the mice via left ventricle. We compared the results obtained with those different doses of ^99mTc-MDP using pinhole SPECT and conventional X-ray skeletal surveys. The data show that the cell-survival number of 111 MBq group has insignificant difference with that of X-ray and the dose is adequate to have an ideal image. Besides, it is important that the chromosome of the cells in the group of 111 MBq showed no irradiation-related damages in our test. These results implied that ^99mTc-MDP pinhole SPECT may provide another way other than conventional X-ray skeletal surveys in detecting bone metastasis of pulmonary adenocarcinoma in BNX mice.     

Towards a Unified Approach for Proving Geometric Ergodicity and Mixing Properties of Nonlinear Autoregressive Processes

Abstract. In this paper we attempt to establish unified sufficient conditions for geometric ergodicity of autoregressive models. It is shown that there is a close relationship between geometric ergodicity and mixing properties. The case of nonstationary time series is incorporated into the investigations. Several time series models including threshold and EXPARCH‐models are examined with respect to geometric ergodicity. In some cases we obtain regions of geometric ergodicity in the parameter space, which are larger than that known from the literature.     

~（99m）Tc-HL91乏氧显像检测鼻咽癌癌灶乏氧状态的临床研究

目的探讨99mTc-HL91在鼻咽癌的临床应用价值。方法对16例初治鼻咽癌患者静脉注射99mTc-HL91925 MBq（25 mci）后4 h进行头颈部断层显像。结果 16例患者中,阳性13例（81.25%）,阳性患者中鼻咽病灶放射性浓聚部位与正常鼻咽组织放射性计数比值（T＋/N）为1.83±0.43,鼻咽病灶放射性非浓聚部位与正常鼻咽组织放射性计数比值（T-/N）为1.12±0.13,两者存在显著性差异（P〈0.001）。结论 99mTc-HL91乏氧显像能监测鼻咽癌癌灶乏氧状态,有一定临床应用价值。