基于Web3D技术的矿床三维可视化系统及应用

基于Web3D技术,研究了在B/S环境下实现矿床三维可视化的方法.通过建立矿床地质数据库及对原始数据的预处理、坐标计算及插值处理,在所建立的系统软件、硬件总体架构之下,实现了Web环境下矿床的整体显示、分层显示、剖切显示和品位区间显示.结合某金矿的实际数据对该系统进行了验证,表明了系统的可靠性及准确性.     

Theory and clinical application of functional MRI: 3D-functional brain mapping

Functional magnetic resonance imaging (fMRI) was performed using a clinical 1.5 T MR scanner. Normal volunteers and patients with several neurological disorders were studied with somatosensory stimulation using sponge at right hand and visual stimulation using checkerboard pattern. Both fMR images by gradient echo echo planar imaging and three dimensional gradient echo images were studied. Reconstructed 3 dimensional functional brain mapping was superimposed on 3D anatomical images. Apparent signal increase was observed at contra lateral sensorimotor cortex and secondary sensory cortex with sponge stimulation. In the case of left homonymous hemianopia due to cerebral infarction, increasing signal was only observed surrounding left calcarine fissure by using stimulation of all visual field. In conclusion, fMRI and 3-D functional brain mapping has extremely high potentiality to examine pathophysiology of various neurological disorders.     

Clinical application of repeated tissue expansion

Acetabular fractures due to bone insufficiency are rare and difficult to diagnose based on clinical findings alone. Plain films are often normal for a long period of time. We report two cases of acetabular fractures in women aged 78 and 90 years, respectively. An acetabular fracture should be considered in elderly females with sudden onset of pain in the groin occurring immediately upon weight-bearing, a clinostatic syndrome, and increased radionuclide uptake by the acetabulum. Computed tomography and magnetic resonance imaging are useful when the diagnosis remains in doubt.     

Stochastic relations between conscious and automatic memory processes: an expansion of the process-dissociation procedure

This paper presents an extension of the process dissociation procedure with wordstem completion, allowing the measurement of the stochastic relation between conscious and automatic processes. The conditional probabilities of conscious remembering with and without automatic processes can be determined. The determination of these conditional probabilities succeeds due to the extension of the process dissociation procedure by an indirect wordstem completion test, without referring to the usual assumptions of the dissociation paradigm. For the evaluation of this extended process dissociation procedure a multinomial model is presented which allows the distinction between voluntary and involuntary conscious memory. The model is applied to a study by ourselves and to an experiment published by Toth, Reingold, and Jacoby (1994). The results show that the assumptions of stochastic independence or redundancy as well as exclusivity of conscious and automatic processes are often violated. Two conscious processes with different probabilities of occurrence are found; voluntary and involuntary conscious memory processes.     

Preimplantation diagnosis for Huntington's disease (HD): clinical application and analysis of the HD expansion in affected embryos

Huntington's disease (HD) is an autosomal dominant disease characterized by motor disturbance, cognitive loss and psychiatric manifestations, starting between the fourth and the fifth decade, followed by death within 10-20 years of onset of the disease. The disease-causing mutation is an expansion of a CAG triplet repeat at the 5' coding end of the Huntington gene. We have developed a single-cell PCR assay for the HD gene in order to propose preimplantation genetic diagnosis (PGD) for the couples at risk. We present here our first results with our first nine PGD cycles and also discuss the behaviour of the disease-causing expansion in pre-implantation embryos.     

Data-driven curvilinear reconstructions of 3D MR images: application to cryptogenic extratemporal epilepsy

This paper presents a data-driven method for the reconstruction and visualisation of curvilinear slices from three-dimensional (3D) magnetic resonance (MR) scans of the head. Visualisation of curvilinear slices, rather than standard planar slices, produces symmetrical views of the cortex and allows small abnormalities to be detected by comparing the two hemispheres of the brain. In our method, the surface defined by the upper half of the brain is used as a reference shape for curvilinear reconstructions. The brain is first segmented from the 3D scan using a 3D region growing method associated to an unsupervised threshold selection technique. The upper half of the segmented brain is then extracted and fitted by a deformable surface model. This surface is finally interactively moved by the operator in the 3D scan, to visualise the desired curvilinear slice, which is projected on the screen as a two-dimensional image. We show an application of this visualisation technique to the localisation of cerebral epileptogenic lesions. The procedure has proven efficient and handy in clinical use.     

Nonsurgical rapid maxillary alveolar expansion in adults: a clinical evaluation

Palatal expansion in adults has traditionally been performed on a very limited basis. The expansion has been thought to be limited in scope and stability and to be associated with unacceptable complications. Instead, surgically assisted rapid maxillary expansion (SA-RME) has been advocated. Five adults with transverse arch deficiency are presented to illustrate the feasibility of nonsurgical expansion using the Haas appliance. Transmolar expansions of 3.9 to 7.5 mm, sufficient to correct the malocclusions, were achieved. Limiting the rate of appliance activation is thought to be important to avoid pain, swelling, and ulceration. Measurements of molar axial angulation, facial divergence, and clinical crown heights demonstrated modest molar tipping, stable mandibular divergence, and only minimal gingival recession. Radiographs revealed minimal observable root resorption of the maxillary molars and premolars. Contour tracings of the palate indicated that most of the correction of the maxillary transarch deficiency occurred at the level of the lateral walls of the palate (the alveolar process) rather than in the skeletal base of the maxilla. For this reason the technique is defined as rapid maxillary alveolar expansion (RMAE). RMAE is an acceptable alternative to SA-RME in adults for most cases of maxillary transarch deficiency. This article is followed by a commentary by Robert L. Vanarsdall Jr., and by an author's response.     

多层自动溜槽的研制及应用

重选因环境影响小、成本低而被广泛应用于金属矿和非金属矿的选矿中。重选效果好坏主要取决于所处理的矿石性质和所选用的重选设备。介绍了多层自动溜槽的结构、选别过程及影响分选效果的因素,以黑龙江乌拉嘎金矿难选矿石为工程背景,通过对浮选精矿浸渣特性的分析,利用最新研制的多层自动溜槽对浮选精矿浸渣采用重选法回收其中的自然金、黄铁矿及其他金属矿物,提高了总选矿回收率指标。同时为难选矿石及同类物料的综合利用开辟了新的途径。     

三维模拟技术在瑞木项目中的应用

以瑞木项目为载体,探索三维模拟技术在项目管理中的应用.建立瑞木项目三维模型库,使用三维模型进行施工方案的演示、工程结构的分析、工艺流程的模拟等,借助三维模拟技术提升项目管理水平.     

AMIAD全自动过滤器的结构特点及应用

详细介绍了AMIADCTF-A全自动过滤器的工作原理、结构特点及其在韶钢动力厂循环水处理系统的应用效果。     

3D fast FLAIR: a CSF-nulled 3D fast spin-echo pulse sequence

OBJECTIVE: To examine the effects of peptidyl membrane interactive molecule D4B in a murine model of lethal burn wound infection. EXPERIMENTAL DESIGN: Four experiments were performed: (1) growth inhibition assays of Pseudomonas aeruginosa treated with D4B, 0 to 100 micromol/L; (2) in vitro coculture of bone marrow cells with D4B, 0 to 100 micromol/L; (3) D4B treatment survival studies after burn injury only or burn wound infection in mice; and (4) peripheral white blood cell count, burn wound tissue bacterial culture, and burn wound morphological analysis at days 1, 2, and 3 after injury. SETTING: University medical center laboratory. SUBJECTS: Groups of B6D2F1 male mice (20 each) were studied. INTERVENTIONS: Full-thickness scald burn, 15% of total body surface area, with P aeruginosa topical infection, and subeschar injections of D4B at 200 microg or 0.25 mL of placebo per mouse at 2 and 24 hours after injury. MAIN OUTCOME MEASURES: Animal survival after thermal burn wound bacterial infection, circulating leukocyte numbers, in vitro clonal cell culture of granulocyte-macrophage progenitor cells, and wound histopathological analysis. RESULTS: The survival rate in the D4B-treated group was nearly 2-fold greater than that in controls (P<.01) during 14 days of study. Bacterial quantitative wound cultures disclosed significant reductions in bacterial numbers at days 1, 2, and 3 in D4B-treated animals as compared with controls (P<.05 to <.01). D4B induced a dose-dependent inhibition of bacterial cell growth when added to in vitro P aeruginosa cultures (P<.01). Granulocyte-macrophage progenitor cell growth in culture was not altered by D4B treatment. D4B-treated animals displayed no signs of toxic effects or impairment in wound healing. CONCLUSIONS: The peptidyl membrane interactive molecule D4B had the ability to improve survival after gram-negative burn wound sepsis via direct antimicrobial effects. Peptidyl membrane interactive molecules may offer the potential of alternative treatments to standard topical agents or in patients with drug-resistant microbes.     

Sacral reflexes: physiology and clinical application

Sacral reflexes consist of motor responses in the pelvic floor and sphincter muscles evoked by stimulation of sensory receptors in pelvic skin, anus, rectum, or pelvic viscera. These responses may be elicited by physical or electrical stimuli. They have been used in research studies of the pathophysiology of pelvic floor and anorectal disorders and many have been recommended for diagnostic use. These reflexes are described and discussed in this review. More rigorous evaluation of their value in the clinical assessment and care of patients with pelvic floor and sphincter disorders is required. Currently direct comparisons of the value of particular responses are generally not available, and few of these reflexes have proven validity for use in clinical diagnosis.     

Mifepristone: clinical application in general gynecology

RU-486, the first clinically available antiprogestin, has numerous gynecologic applications beyond first-trimester pregnancy termination. Long-term administration of 2 mg/day of RU-486 suppresses ovulation while maintaining serum estrogen levels and ovarian follicular activity. In the endometrium, long-term RU-486 administration results in significant endometrial dysynchrony and stromal compaction. RU-486 has been demonstrated to relieve pain in women with symptomatic endometriosis and decrease the size of uterine leiomyomata by about 50%. There are preliminary findings indicating that RU-486 is effective in the treatment of premenstrual syndrome, ectopic pregnancy, and anovulatory uterine bleeding. In need of further investigation is the RU-486 dosage that can treat pathophysiologic states while minimizing the endometrial effects.     

Iron ore sinter porosity characterisation with application of 3D X-ray tomography

Abstract

X-ray tomography has been applied for the estimation of iron ore sinter porosity. Procedures to distinguish open and closed pores and to estimate the volume and the equivalent diameter of each pore were developed, providing the possibility to calculate the amount of porosity considering open and closed pores separately. The effect of the sinter mixture composition on the porosity parameters was investigated, and a comparison with a mercury intrusion measurement is also presented. Reducibility tests were performed for the samples, the porosity of which had been previously identified by tomography. The fact that samples with a premeasured porosity could be analysed with other characterisation methods opens new possibilities to understand the effect of the porosity on the properties of the sinter.     

智能MCC自动化控制系统的配置及其应用

在智能MCC中融合了当今的现场总线技术、通信技术和控制技术,使得智能MCC成为一种先进、简洁、高效的自动化控制系统.以智能MCC作为自动化系统平台,改变了以往传统的MCC加控制柜,使用大量控制电缆的系统集成方式.本文简要介绍智能MCC自动化控制系统的配置方法及在实际工程中的应用.     

Development of rotational digital angiography and new cone-beam 3D image: clinical value in vascular lesions

There are no data in the literature on effects of supplementing infants with yeast-selenium. We therefore studied the impact of selenium-enriched yeast on the serum selenium concentration of preterm infants living in a selenium-low area (Hungary). Twenty-eight preterm infants with a mean +/- SD birthweight of 962 +/- 129 g and a gestational age of 27 +/- 1 weeks were randomized into two groups at birth with respect to selenium supplementation. In the supplemental group (n = 14) infants received 4.8 mg yeast containing 5 microgram selenium daily with naso-gastric drip during the first 14 postnatal days. The nonsupplemented infants were used as a reference group. In the supplemented group the serum selenium concentration increased from 32.1 +/- 8.5 microgram/l to 41.5 +/- 6.5 microgram/l and in the nonsupplemented group it decreased from 25.9 +/ 6.8 microgram/l to 18.2 +/- 6.4 microgram/l within two weeks. The serum glutathione peroxidase activity increased from 2.97 +/- 0.73 U/20 microliter to 6.42 +/- 3.11 U/20 microliter in the supplemented group, and it did not change significantly (from 3.53 +/- 0.94 U/20 microliter to 3.85 +/- 0.95 U/20 microliter) in the nonsupplemented group. We did not observe any complications or side effects in connection with enteral yeast-selenium supplementation. It is concluded that selenium-enriched yeast is a safe and an effective form of short term enteral selenium supplementation for preterm infants.     

采空区三维激光扫描信息可视化集成系统设计及应用

为了更好地对采空区三维数据进行有效建模分析,开展采空区三维激光扫描信息可视化集成系统研发.在核心算法的基础上对点云进行过滤分析处理,保证建模的精度和速度.采用CVIS这一专门用于采空区三维激光扫描空间信息处理的系统,Windows开发平台,Visual C++开发环境,以及OpenGL开放性接口进行开发.通过对研发的系...     

太钢1800m~3高炉煤气干法除尘自动控制系统设计及应用

结合太钢不锈钢股份有限公司新建1800m3高炉煤气干法除尘工艺,设计了干法除尘自动控制系统.介绍了该系统的组成及功能,着重分析了独特的周期定时过滤反吹动作控制时序.现场运行表明,该系统功能强大,控制灵活,操作方便,运行稳定可靠,基于本控制系统的煤气干法除尘效率高、节能环保效果显著,对同行业的生产进步将起到推动作用.