Note: This page contains sample records for the topic acquired motor fusion from Science.gov.
While these samples are representative of the content of Science.gov,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of Science.gov
to obtain the most current and comprehensive results.
Last update: November 12, 2013.
1

ACQUIRED OCULAR MOTOR APRAXIA AFTER AORTIC SURGERY  

PubMed Central

Purpose To describe an unusual form of acquired ocular motor apraxia. Methods Case reports with electronic eye movement recordings. Results Three patients had surgery to repair aortic root or arch dissections or aneurysms. A few days after surgery, all had ophthalmoplegia. Neuro-ophthalmic examination found complete absence of horizontal and vertical volitional and reflex saccades in 1 patient and slow, hypometric saccades in 2 others. However, smooth pursuit, slow phases of optokinetic nystagmus, and the vestibulo-ocular response (VOR) were intact. Fast phases of the VOR were absent in 2 patients but were intact in the other. Video and electronic eye movement recordings documented the findings. Magnetic resonance imaging (MRI) in 1 patient showed small infarcts in a cerebellar hemisphere, pons, and cerebral hemispheres. The other patients’ MRIs showed no significant lesions. Conclusions Acquired ocular motor apraxia with profoundly impaired volitional saccades after aortic surgery is a distinctive syndrome, but its pathophysiology is unclear. Studies of neurologic damage in animals and patients undergoing similar surgical procedures provide conflicting data. However, knowledge about the complex neural pathways generating saccades from animal and human studies, and detailed clinical observations, as in the patients described here, can help to determine the location of lesions. Based on the 3 cases reported here, we propose that this syndrome might be due to damage to excitatory burst and/or omnipause neurons in the brainstem or by damage to pathways from the frontal eye fields to the brainstem.

Yee, Robert Donald; Purvin, Valerie Ann

2007-01-01

2

Acquiring functional object knowledge through motor imagery?  

PubMed

A widely investigated question in the research on the acquisition of novel functional object representations is the role of the action system. Whereas most studies so far have investigated the role of active action training on the acquisition of object representation, we investigated whether people are able to acquire object representations by just imagining the use of novel objects, given that previous findings suggested that executed and imagined actions share a common representational format. To this end, participants trained the use of novel objects in a motor imagery condition. Training comprised the particular grip applied to the objects and the objects' typical end location. Subsequently, participants' object representations were assessed by means of an object detection task. The results show that participants responded slower when the novel objects were presented at functionally incorrect end locations, indicating that the participants had acquired functional knowledge about object use. Yet, there was no effect of correct versus incorrect grip. Altogether, the findings suggest that motor imagery can facilitate the acquisition of novel object representations, but point also to differences between first-hand action training and training by imagery. PMID:22430184

Paulus, Markus; van Elk, Michiel; Bekkering, Harold

2012-03-20

3

Neuron activity in the anterolateral motor cortex in operant food-acquiring and alcohol-acquiring behavior  

Microsoft Academic Search

The interactions of the neuronal mechanisms of food-acquiring behavior and newly formed operant alcohol-acquiring behavior were studied by recording the activity of individual neurons in the anterolateral area of the motor cortex in chronically alcoholized rabbits. Adult animals learned food-acquiring behavior in a cage with two feeders and two pedals, in the corners (the food in the feeders was presented

Yu. I. Aleksandrov; Yu. V. Grinchenko; D. G. Shevchenko; V. N. Mats; S. Laukka; R. G. Averkin

2005-01-01

4

Gene Therapy Using Gene Fusions for Genetic or Acquired Disorders.  

National Technical Information Service (NTIS)

The invention is related generally to the construction of fusion genes. More particularly, it is related to the construction of a fusion gene comprising a coding sequence for a selectable marker linked by fusion to another coding sequence, the product of ...

I. Pastan M. Gottesman

1988-01-01

5

Reliability of the Motor Learning Strategy Rating Instrument for Children and Youth with Acquired Brain Injury  

ERIC Educational Resources Information Center

|Purpose: To evaluate reliability and feasibility of the Motor Learning Strategy Rating Instrument (MLSRI) in children with acquired brain injury (ABI). The MLSRI quantifies the extent to which motor learning strategies (MLS) are used within physiotherapy (PT) interventions. Methods: PT sessions conducted by ABI team physiotherapists with a…

Kamath, Trishna; Pfeifer, Megan; Banerjee-Guenette, Priyanka; Hunter, Theresa; Ito, Julia; Salbach, Nancy M.; Wright, Virginia; Levac, Danielle

2012-01-01

6

EML4-ALK fusion lung cancer: a rare acquired event  

Microsoft Academic Search

A recurrent gene fusion between EML4 and ALK in 6.7% of non-small cell lung cancers (NSCLCs) and NKX2-1 (TTF1, TITF1) high-level amplifications in 12% of adenocarcinomas of the lung were independently reported recently. Because the EML4-ALK fusion was only shown by a reverse transcription-polymerase chain reaction approach, we developed fluorescent in situ hybridization assays to interrogate more than 600 NSCLCs

A M Chinnaiyan; Patrick L. Wagner; Francesca Demichelis; Rohit Mehra; Christopher J. LaFargue; Benjamin J. Moss; Stefanie Arbogast; Alex Soltermann; Walter Weder; Thomas J. Giordano; David G. Beer; David S. Rickman; Holger Moch; Mark A. Rubin

2008-01-01

7

Non-Speech Oro-Motor Exercise Use in Acquired Dysarthria Management: Regimes and Rationales  

ERIC Educational Resources Information Center

|Background: Non-speech oro-motor exercises (NSOMExs) are described in speech and language therapy manuals and are thought to be much used in acquired dysarthria intervention, though there is no robust evidence of an influence on speech outcome. Opinions differ as to whether, and for which dysarthria presentations, NSOMExs are appropriate. Aims:…

Mackenzie, Catherine; Muir, Margaret; Allen, Carolyn

2010-01-01

8

Extensive Fusion of Mitochondria in Spinal Cord Motor Neurons  

PubMed Central

The relative roles played by trafficking, fission and fusion in the dynamics of mitochondria in neurons have not been fully elucidated. In the present study, a slow widespread redistribution of mitochondria within cultured spinal cord motor neurons was observed as a result of extensive organelle fusion. Mitochondria were labeled with a photoconvertible fluorescent protein (mitoKaede) that is red-shifted following brief irradiation with blue light. The behavior of these selectively labeled mitochondria was followed by live fluorescence imaging. Marking mitochondria within the cell soma revealed a complete mixing, within 18 hours, of these organelles with mitochondria coming from the surrounding neurites. Fusion of juxtaposed mitochondria was directly observed in neuritic processes at least 200 microns from the cell body. Within 24 hours, photoconverted mitoKaede was dispersed to all of the mitochondria in the portion of neurite under observation. When time lapse imaging over minutes was combined with long-term observation of marked mitochondria, moving organelles that traversed the field of view did not initially contain photoconverted protein, but after several hours organelles in motion contained both fluorescent proteins, coincident with widespread fusion of all of the mitochondria within the length of neurite under observation. These observations suggest that there is a widespread exchange of mitochondrial components throughout a neuron as a result of organelle fusion.

Owens, Geoffrey C.; Walcott, Elisabeth C.

2012-01-01

9

Multisensor fusion for induction motor aging analysis and fault diagnosis  

Microsoft Academic Search

Induction motors are the most commonly used electrical drives, ranging in power from fractional horsepower to several thousand horsepowers. Several studies have been conducted to identify the cause of failure of induction motors in industrial applications. Recent activities indicate a focus towards building intelligence into the motors, so that a continuous on-line fault diagnosis and prognosis may be performed. The

Ali Seyfettin Erbay

1999-01-01

10

Acquiring a Novel Coordination Skill without Practicing the Correct Motor Commands  

Microsoft Academic Search

There is evidence that experience of the sensory consequences, in the absence of practice of the required motor commands, is sufficient to learn new bimanual coordination patterns. This was shown through improvements of an incongruent group who practiced a desired 30° phase offset between the limbs while 1 limb was weighted such that the desired phase relation was achieved when

Lieke Feijen; Nicola J. Hodges; Peter J. Beek

2010-01-01

11

Characterization of the gag/fusion protein encoded by the defective Duplan retrovirus inducing murine acquired immunodeficiency syndrome.  

PubMed Central

Murine acquired immunodeficiency syndrome is induced by a defective retrovirus. Sequencing of this defective viral genome revealed a long open reading frame which encodes a putative gag/fusion protein, N-MA-p12-CA-NC-COOH, (D. C. Aziz, Z. Hanna, and P. Jolicoeur, Nature (London) 338:505-508, 1989). We raised a specific antibody to the unique p12 domain of this gag fusion precursor, Pr60gag. We found that Pr60gag was indeed encoded by the defective viral genome both in cell-free translation reticulocyte extracts and in infected mouse fibroblasts. Pr60gag was found to be myristylated, phosphorylated, and attached to the cell membrane, like other helper murine leukemia virus (MuLV) gag precursors. Pr60gag was not substantially cleaved within the nonproducer cells and was not released from these cells. However, in the presence of helper MuLV proteins, it formed phenotypically mixed particles. In these particles, Pr60gag was only partially cleaved. In helper MuLV-producing cells harboring the defective virus, a gag-related p40 intermediate was generated both intracellularly and extracellularly. In these cells, Pr60gag appeared to behave as a dominant negative mutant, interfering with proper cleavage of helper Pr65gag. Our data indicate that Pr60gag is a major (and possibly the only) gene product of the defective murine acquired immunodeficiency syndrome virus and is likely to harbor some determinants of pathogenicity of this virus. Images

Huang, M; Jolicoeur, P

1990-01-01

12

Highly efficient retrograde gene transfer into motor neurons by a lentiviral vector pseudotyped with fusion glycoprotein.  

PubMed

The development of gene therapy techniques to introduce transgenes that promote neuronal survival and protection provides effective therapeutic approaches for neurological and neurodegenerative diseases. Intramuscular injection of adenoviral and adeno-associated viral vectors, as well as lentiviral vectors pseudotyped with rabies virus glycoprotein (RV-G), permits gene delivery into motor neurons in animal models for motor neuron diseases. Recently, we developed a vector with highly efficient retrograde gene transfer (HiRet) by pseudotyping a human immunodeficiency virus type 1 (HIV-1)-based vector with fusion glycoprotein B type (FuG-B) or a variant of FuG-B (FuG-B2), in which the cytoplasmic domain of RV-G was replaced by the corresponding part of vesicular stomatitis virus glycoprotein (VSV-G). We have also developed another vector showing neuron-specific retrograde gene transfer (NeuRet) with fusion glycoprotein C type, in which the short C-terminal segment of the extracellular domain and transmembrane/cytoplasmic domains of RV-G was substituted with the corresponding regions of VSV-G. These two vectors afford the high efficiency of retrograde gene transfer into different neuronal populations in the brain. Here we investigated the efficiency of the HiRet (with FuG-B2) and NeuRet vectors for retrograde gene transfer into motor neurons in the spinal cord and hindbrain in mice after intramuscular injection and compared it with the efficiency of the RV-G pseudotype of the HIV-1-based vector. The main highlight of our results is that the HiRet vector shows the most efficient retrograde gene transfer into both spinal cord and hindbrain motor neurons, offering its promising use as a gene therapeutic approach for the treatment of motor neuron diseases. PMID:24086660

Hirano, Miyabi; Kato, Shigeki; Kobayashi, Kenta; Okada, Tomoaki; Yaginuma, Hiroyuki; Kobayashi, Kazuto

2013-09-24

13

Highly Efficient Retrograde Gene Transfer into Motor Neurons by a Lentiviral Vector Pseudotyped with Fusion Glycoprotein  

PubMed Central

The development of gene therapy techniques to introduce transgenes that promote neuronal survival and protection provides effective therapeutic approaches for neurological and neurodegenerative diseases. Intramuscular injection of adenoviral and adeno-associated viral vectors, as well as lentiviral vectors pseudotyped with rabies virus glycoprotein (RV-G), permits gene delivery into motor neurons in animal models for motor neuron diseases. Recently, we developed a vector with highly efficient retrograde gene transfer (HiRet) by pseudotyping a human immunodeficiency virus type 1 (HIV-1)-based vector with fusion glycoprotein B type (FuG-B) or a variant of FuG-B (FuG-B2), in which the cytoplasmic domain of RV-G was replaced by the corresponding part of vesicular stomatitis virus glycoprotein (VSV-G). We have also developed another vector showing neuron-specific retrograde gene transfer (NeuRet) with fusion glycoprotein C type, in which the short C-terminal segment of the extracellular domain and transmembrane/cytoplasmic domains of RV-G was substituted with the corresponding regions of VSV-G. These two vectors afford the high efficiency of retrograde gene transfer into different neuronal populations in the brain. Here we investigated the efficiency of the HiRet (with FuG-B2) and NeuRet vectors for retrograde gene transfer into motor neurons in the spinal cord and hindbrain in mice after intramuscular injection and compared it with the efficiency of the RV-G pseudotype of the HIV-1-based vector. The main highlight of our results is that the HiRet vector shows the most efficient retrograde gene transfer into both spinal cord and hindbrain motor neurons, offering its promising use as a gene therapeutic approach for the treatment of motor neuron diseases.

Hirano, Miyabi; Kato, Shigeki; Kobayashi, Kenta; Okada, Tomoaki; Yaginuma, Hiroyuki; Kobayashi, Kazuto

2013-01-01

14

Acquiring transgenic tobacco plants with insect resistance and glyphosate tolerance by fusion gene transformation.  

PubMed

The advantages of gene 'stacking' or 'pyramiding' are obvious in genetically modified (GM) crops, and several different multi-transgene-stacking methods are available. Using linker peptides for multiple gene transformation is considered to be a good method to meet a variety of needs. In our experiment, the Bt cry1Ah gene, which encodes the insect-resistance protein, and the mG ( 2 ) -epsps gene, which encodes the glyphosate-tolerance protein, were connected by a 2A or LP4/2A linker. Linker 2A is a peptide from the foot-and-mouth disease virus (FMDV) that has self-cleavage activity. LP4 is a peptide from Raphanus sativus seeds that has a recognition site and is cleaved by a protease. LP4/2A is a hybrid peptide that contains the first 9 amino acids of LP4 and 20 amino acids from 2A. We used the linker peptide to construct four coordinated expression vectors: pHAG, pHLAG, pGAH and pGLAH. Two single gene expression vectors, pSAh and pSmG(2), were used as controls. The six expression vectors and the pCAMBIA2301 vector were transferred into tobacco by Agrobacterium tumefaciens-mediated transformation, and 529 transformants were obtained. Molecular detection and bioassay detection data demonstrated that the transgenic tobaccos possessed good pest resistance and glyphosate tolerance. The two genes in the fusion vector were expressed simultaneously. The plants with the genes linked by the LP4/2A peptide showed better pest resistance and glyphosate tolerance than the plants with the genes linked by 2A. The expression level of the two genes linked by LP4/2A was not significantly different from the single gene vector. Key message The expression level of the two genes linked by LP4/2A was higher than those linked by 2A and was not significantly different from the single gene vector. PMID:22777591

Sun, He; Lang, Zhihong; Zhu, Li; Huang, Dafang

2012-07-10

15

Promoting Adaptive Behavior in Persons with Acquired Brain Injury, Extensive Motor and Communication Disabilities, and Consciousness Disorders  

ERIC Educational Resources Information Center

|These two studies extended the evidence on the use of technology-based intervention packages to promote adaptive behavior in persons with acquired brain injury and multiple disabilities. Study I involved five participants in a minimally conscious state who were provided with intervention packages based on specific arrangements of optic, tilt, or…

Lancioni, Giulio E.; Singh, Nirbhay N.; O'Reilly, Mark F.; Sigafoos, Jeff; Belardinelli, Marta Olivetti; Buonocunto, Francesca; Sacco, Valentina; Navarro, Jorge; Lanzilotti, Crocifissa; De Tommaso, Marina; Megna, Marisa; Badagliacca, Francesco

2012-01-01

16

Promoting Adaptive Behavior in Persons with Acquired Brain Injury, Extensive Motor and Communication Disabilities, and Consciousness Disorders  

ERIC Educational Resources Information Center

These two studies extended the evidence on the use of technology-based intervention packages to promote adaptive behavior in persons with acquired brain injury and multiple disabilities. Study I involved five participants in a minimally conscious state who were provided with intervention packages based on specific arrangements of optic, tilt, or…

Lancioni, Giulio E.; Singh, Nirbhay N.; O'Reilly, Mark F.; Sigafoos, Jeff; Belardinelli, Marta Olivetti; Buonocunto, Francesca; Sacco, Valentina; Navarro, Jorge; Lanzilotti, Crocifissa; De Tommaso, Marina; Megna, Marisa; Badagliacca, Francesco

2012-01-01

17

Fusion  

Microsoft Academic Search

The book abounds with fascinating anecdotes about fusion's rocky path: the spurious claim by Argentine dictator Juan Peron in 1951 that his country had built a working fusion reactor, the rush by the United States to drop secrecy and publicize its fusion work as a propaganda offensive after the Russian success with Sputnik; the fortune Penthouse magazine publisher Bob Guccione

Robin Herman

1990-01-01

18

Strategy for treating motor neuron diseases using a fusion protein of botulinum toxin binding domain and streptavidin for viral vector access: work in progress.  

PubMed

Although advances in understanding of the pathogenesis of amyotrophic lateral sclerosis (ALS) and spinal muscular atrophy (SMA) have suggested attractive treatment strategies, delivery of agents to motor neurons embedded within the spinal cord is problematic. We have designed a strategy based on the specificity of botulinum toxin, to direct entry of viral vectors carrying candidate therapeutic genes into motor neurons. We have engineered and expressed fusion proteins consisting of the binding domain of botulinum toxin type A fused to streptavidin (SAv). This fusion protein will direct biotinylated viral vectors carrying therapeutic genes into motor nerve terminals where they can enter the acidified endosomal compartments, be released and undergo retrograde transport, to deliver the genes to motor neurons. Both ends of the fusion proteins are shown to be functionally intact. The binding domain end binds to mammalian nerve terminals at neuromuscular junctions, ganglioside GT1b (a target of botulinum toxin), and a variety of neuronal cells including primary chick embryo motor neurons, N2A neuroblastoma cells, NG108-15 cells, but not to NG CR72 cells, which lack complex gangliosides. The streptavidin end binds to biotin, and to a biotinylated Alexa 488 fluorescent tag. Further studies are in progress to evaluate the delivery of genes to motor neurons in vivo, by the use of biotinylated viral vectors. PMID:22069580

Drachman, Daniel B; Adams, Robert N; Balasubramanian, Uma; Lu, Yang

2010-12-20

19

Strategy for Treating Motor Neuron Diseases Using a Fusion Protein of Botulinum Toxin Binding Domain and Streptavidin for Viral Vector Access: Work in Progress  

PubMed Central

Although advances in understanding of the pathogenesis of amyotrophic lateral sclerosis (ALS) and spinal muscular atrophy (SMA) have suggested attractive treatment strategies, delivery of agents to motor neurons embedded within the spinal cord is problematic. We have designed a strategy based on the specificity of botulinum toxin, to direct entry of viral vectors carrying candidate therapeutic genes into motor neurons. We have engineered and expressed fusion proteins consisting of the binding domain of botulinum toxin type A fused to streptavidin (SAv). This fusion protein will direct biotinylated viral vectors carrying therapeutic genes into motor nerve terminals where they can enter the acidified endosomal compartments, be released and undergo retrograde transport, to deliver the genes to motor neurons. Both ends of the fusion proteins are shown to be functionally intact. The binding domain end binds to mammalian nerve terminals at neuromuscular junctions, ganglioside GT1b (a target of botulinum toxin), and a variety of neuronal cells including primary chick embryo motor neurons, N2A neuroblastoma cells, NG108-15 cells, but not to NG CR72 cells, which lack complex gangliosides. The streptavidin end binds to biotin, and to a biotinylated Alexa 488 fluorescent tag. Further studies are in progress to evaluate the delivery of genes to motor neurons in vivo, by the use of biotinylated viral vectors.

Drachman, Daniel B.; Adams, Robert N.; Balasubramanian, Uma; Lu, Yang

2010-01-01

20

Fusion  

NASA Astrophysics Data System (ADS)

The book abounds with fascinating anecdotes about fusion's rocky path: the spurious claim by Argentine dictator Juan Peron in 1951 that his country had built a working fusion reactor, the rush by the United States to drop secrecy and publicize its fusion work as a propaganda offensive after the Russian success with Sputnik; the fortune Penthouse magazine publisher Bob Guccione sank into an unconventional fusion device, the skepticism that met an assertion by two University of Utah chemists in 1989 that they had created "cold fusion" in a bottle. Aimed at a general audience, the book describes the scientific basis of controlled fusion--the fusing of atomic nuclei, under conditions hotter than the sun, to release energy. Using personal recollections of scientists involved, it traces the history of this little-known international race that began during the Cold War in secret laboratories in the United States, Great Britain and the Soviet Union, and evolved into an astonishingly open collaboration between East and West.

Herman, Robin

1990-10-01

21

Acquired Brain Injury Program.  

ERIC Educational Resources Information Center

|This paper reviews the Acquired Brain Injury (ABI) Program at Coastline Community College (California). The ABI Program is a two-year, for-credit educational curriculum designed to provide structured cognitive retraining for adults who have sustained an ABI due to traumatic (such as motor vehicle accident or fall) or non-traumatic(such as…

Schwartz, Stacey Hunter

22

A faster, high resolution, mtPA-GFP-based mitochondrial fusion assay acquiring kinetic data of multiple cells in parallel using confocal microscopy.  

PubMed

Mitochondrial fusion plays an essential role in mitochondrial calcium homeostasis, bioenergetics, autophagy and quality control. Fusion is quantified in living cells by photo-conversion of matrix targeted photoactivatable GFP (mtPAGFP) in a subset of mitochondria. The rate at which the photoconverted molecules equilibrate across the entire mitochondrial population is used as a measure of fusion activity. Thus far measurements were performed using a single cell time lapse approach, quantifying the equilibration in one cell over an hour. Here, we scale up and automate a previously published live cell method based on using mtPAGFP and a low concentration of TMRE (15 nm). This method involves photoactivating a small portion of the mitochondrial network, collecting highly resolved stacks of confocal sections every 15 min for 1 hour, and quantifying the change in signal intensity. Depending on several factors such as ease of finding PAGFP expressing cells, and the signal of the photoactivated regions, it is possible to collect around 10 cells within the 15 min intervals. This provides a significant improvement in the time efficiency of this assay while maintaining the highly resolved subcellular quantification as well as the kinetic parameters necessary to capture the detail of mitochondrial behavior in its native cytoarchitectural environment. Mitochondrial dynamics play a role in many cellular processes including respiration, calcium regulation, and apoptosis. The structure of the mitochondrial network affects the function of mitochondria, and the way they interact with the rest of the cell. Undergoing constant division and fusion, mitochondrial networks attain various shapes ranging from highly fused networks, to being more fragmented. Interestingly, Alzheimer's disease, Parkinson's disease, Charcot Marie Tooth 2A, and dominant optic atrophy have been correlated with altered mitochondrial morphology, namely fragmented networks. Often times, upon fragmentation, mitochondria become depolarized, and upon accumulation this leads to impaired cell function. Mitochondrial fission has been shown to signal a cell to progress toward apoptosis. It can also provide a mechanism by which to separate depolarized and inactive mitochondria to keep the bulk of the network robust. Fusion of mitochondria, on the other hand, leads to sharing of matrix proteins, solutes, mtDNA and the electrochemical gradient, and also seems to prevent progression to apoptosis. How fission and fusion of mitochondria affects cell homeostasis and ultimately the functioning of the organism needs further understanding, and therefore the continuous development and optimization of how to gather information on these phenomena is necessary. Existing mitochondrial fusion assays have revealed various insights into mitochondrial physiology, each having its own advantages. The hybrid PEG fusion assay, mixes two populations of differently labeled cells (mtRFP and mtYFP), and analyzes the amount of mixing and colocalization of fluorophores in fused, multinucleated, cells. Although this method has yielded valuable information, not all cell types can fuse, and the conditions under which fusion is stimulated involves the use of toxic drugs that likely affect the normal fusion process. More recently, a cell free technique has been devised, using isolated mitochondria to observe fusion events based on a luciferase assay. Two human cell lines are targeted with either the amino or a carboxy terminal part of Renilla luciferase along with a leucine zipper to ensure dimerization upon mixing. Mitochondria are isolated from each cell line, and fused. The fusion reaction can occur without the cytosol under physiological conditions in the presence of energy, appropriate temperature and inner mitochondrial membrane potential. Interestingly, the cytosol was found to modulate the extent of fusion, demonstrating that cell signaling regulates the fusion process. This assay will be very useful for high throughput screening to identify components of the fusion machinery and also pharmacological c

Lovy, Alenka; Molina, Anthony J A; Cerqueira, Fernanda M; Trudeau, Kyle; Shirihai, Orian S

2012-07-20

23

Acquired neuropathies.  

PubMed

Acquired neuropathies represent most of the neuropathies encountered in clinical practice. Hundreds of causes have been identified even though up to 41 % of patients are still classified as idiopathic (Rajabally and Shah in J Neurol 258:1431-1436, 1). Routine evaluation relies on comprehensive medical history taking, clinical examination, nerve conduction studies and laboratory tests. Other investigations such as nerve biopsy or nerve or muscle imaging are performed in specific settings. This review focuses on recent advances in acquired neuropathies. PMID:23771508

Lozeron, Pierre; Trocello, Jean-Marc; Kubis, Nathalie

2013-06-16

24

Acquired Methemoglobinaemia  

PubMed Central

Acquired methemoglobinaemia is a relatively rare condition and, therefore infrequently encountered in acute medical practice. Suspicion of the condition may be triggered when the measured PaO2 is ‘out of keeping’ with the oxygen saturations that are discovered with pulse oximetry. We describe two separate cases of acquired methemoglobinaemia secondary to the recreational use of alkyl nitrites (’poppers’). The patients presented at separate times to two different teaching hospitals in London, UK. The similarity of these cases has led the authors to conclude that a raised awareness of this potentially fatal condition, and its association with a widely-available recreational drug, is necessary to ensure a correct and timely diagnosis.

Al-Lawati, Adil; Murch, Nick

2012-01-01

25

Clinical Evaluation of Spatial Accuracy of a Fusion Imaging Technique Combining Previously Acquired Computed Tomography and Real-Time Ultrasound for Imaging of Liver Metastases  

SciTech Connect

Purpose: This study was designed to evaluate the spatial accuracy of matching volumetric computed tomography (CT) data of hepatic metastases with real-time ultrasound (US) using a fusion imaging system (VNav) according to different clinical settings. Methods: Twenty-four patients with one hepatic tumor identified on enhanced CT and US were prospectively enrolled. A set of three landmarks markers was chosen on CT and US for image registration. US and CT images were then superimposed using the fusion imaging display mode. The difference in spatial location between the tumor visible on the CT and the US on the overlay images (reviewer no. 1, comment no. 2) was measured in the lateral, anterior-posterior, and vertical axis. The maximum difference (Dmax) was evaluated for different predictive factors.CT performed 1-30 days before registration versus immediately before. Use of general anesthesia for CT and US versus no anesthesia.Anatomic landmarks versus landmarks that include at least one nonanatomic structure, such as a cyst or a calcificationResultsOverall, Dmax was 11.53 {+-} 8.38 mm. Dmax was 6.55 {+-} 7.31 mm with CT performed immediately before VNav versus 17.4 {+-} 5.18 with CT performed 1-30 days before (p < 0.0001). Dmax was 7.05 {+-} 6.95 under general anesthesia and 16.81 {+-} 6.77 without anesthesia (p < 0.0015). Landmarks including at least one nonanatomic structure increase Dmax of 5.2 mm (p < 0.0001). The lowest Dmax (1.9 {+-} 1.4 mm) was obtained when CT and VNav were performed under general anesthesia, one immediately after the other. Conclusions: VNav is accurate when adequate clinical setup is carefully selected. Only under these conditions (reviewer no. 2), liver tumors not identified on US can be accurately targeted for biopsy or radiofrequency ablation using fusion imaging.

Hakime, Antoine, E-mail: thakime@yahoo.com; Deschamps, Frederic; Garcia Marques de Carvalho, Enio; Teriitehau, Christophe; Auperin, Anne; De Baere, Thierry [Gustave Roussy Institute (France)

2011-04-15

26

A role for motor and somatosensory evoked potentials during anterior cervical discectomy and fusion for patients without myelopathy: Analysis of 57 consecutive cases  

PubMed Central

Background: Although the usage of combined motor and sensory intraoperative monitoring has been shown to improve the surgical outcome of patients with cervical myelopathy, the role of transcranial electric motor evoked potentials (tceMEP) used in conjunction with somatosensory evoked potentials (SSEP) in patients presenting with radiculopathy but without myelopathy has been less clear. Methods: We retrospectively reviewed all patients (n = 57) with radiculopathy but without myelopathy, undergoing anterior cervical decompression and fusion at a single institution over the past 3 years, who had intraoperative monitoring with both tceMEPs and SSEPs. Results: Fifty-seven (100%) patients presented with radiculopathy, 53 (93.0%) with mechanical neck pain, 35 (61.4%) with motor dysfunction, and 29 (50.9%) with sensory deficits. Intraoperatively, 3 (5.3%) patients experienced decreases in SSEP signal amplitudes and 4 (6.9%) had tceMEP signal changes. There were three instances where a change in neuromonitoring signal required intraoperative alteration of the surgical procedure: these were deemed clinically significant events/true positives. SSEP monitoring showed two false positives and two false negatives, whereas tceMEP monitoring only had one false positive and no false negatives. Thus, tceMEP monitoring exhibited higher sensitivity (33.3% vs. 100%), specificity (95.6% vs. 98.1%), positive predictive value (33.3% vs. 75.0%), negative predictive value (97.7% vs. 100%), and efficiency (91.7% vs. 98.2%) compared to SSEP monitoring alone. Conclusions: Here, we present a retrospective series of 57 patients where tceMEP/SSEP monitoring likely prevented irreversible neurologic damage. Though further prospective studies are needed, there may be a role for combined tceMEP/SSEP monitoring for patients undergoing anterior cervical decompression without myelopathy.

Xu, Risheng; Ritzl, Eva K.; Sait, Mohammed; Sciubba, Daniel M.; Wolinsky, Jean-Paul; Witham, Timothy F.; Gokaslan, Ziya L.; Bydon, Ali

2011-01-01

27

Escherichia coli alkaline phosphatase localized to the cytoplasm slowly acquires enzymatic activity in cells whose growth has been suspended: a caution for gene fusion studies.  

PubMed Central

Alkaline phosphatase is normally localized to the periplasm of Escherichia coli and is unable to fold into its native conformation if retained in the cytoplasm of growing cells. The alkaline phosphatase activity of E. coli expressing a version of the protein without a signal sequence was nonetheless found to increase gradually when the growth of cells was suspended. At least 30% of the protein was activated over the course of several hours when freshly grown exponential-phase cells were held on ice. Similar behavior was observed with cells expressing certain other mutant versions of alkaline phosphatase that are retained in the cytoplasm. The activation resulted not from the passage of the alkaline phosphatase into the periplasm but from the slow folding of alkaline phosphatase into its native conformation in the cytoplasm. These findings indicate that the mechanism by which proteins are normally kept reduced in the cytoplasm fails to function if cells are not growing. It was found that the addition of the sulfhydryl-alkylating agent iodoacetamide to cells after growth blocks this activation completely. This treatment can therefore diminish the likelihood of spurious enzyme activity measurements in studies that make use of alkaline phosphatase fusion proteins.

Derman, A I; Beckwith, J

1995-01-01

28

Acquired Methemoglobinemia  

PubMed Central

Cases of acquired methemoglobinemia have been identified with increasing frequency in Los Angeles during the last several years. Among 18 patients, both infants and adults, the most commonly incriminated agent was silver nitrate used for topical antibacterial prophylaxis of burn wounds. One burned child died from overwhelming septicemia complicated by hypoxia with a methemoglobin level of 5.4 grams per dl. Other causative factors included nitrate-rich vegetables used in early infancy, additives in ethnic foods, and prescribed and overdosed drugs. Discontinuation of the precipitating agent and methylene blue therapy were usually followed by prompt improvement. In burned patients treated with silver nitrate, careful regular monitoring of serum methemoglobin levels and early initiation of specific therapy are mandatory.

Geffner, Mitchell E.; Powars, Darleen R.; Choctaw, William T.

1981-01-01

29

Calibrating the BOLD signal during a motor task using an extended fusion model incorporating DOT, BOLD and ASL data  

PubMed Central

Multimodal imaging improves the accuracy of the localization and the quantification of brain activation when measuring different manifestations of the hemodynamic response associated with cerebral activity. In this study, we incorporated cerebral blood flow (CBF) changes measured with arterial spin labeling (ASL), Diffuse Optical Tomography (DOT) and blood oxygen level-dependent (BOLD) recordings to reconstruct changes in oxy- (?HbO2) and deoxyhemoglobin (?HbR). Using the Grubb relation between relative changes in CBF and cerebral blood volume (CBV), we incorporated the ASL measurement as a prior to the total hemoglobin concentration change (?HbT). We applied this ASL fusion model to both synthetic data and experimental multimodal recordings during a 2-sec finger-tapping task. Our results show that the new approach is very powerful in estimating ?HbO2 and ?HbR with high spatial and quantitative accuracy. Moreover, our approach allows the computation of baseline total hemoglobin concentration (HbT0) as well as of the BOLD calibration factor M on a single subject basis. We obtained an average HbT0 of 71 ?M, an average M value of 0.18 and an average increase of 13 % in cerebral metabolic rate of oxygen (CMRO2), all of which are in agreement with values previously reported in the literature. Our method yields an independent measurement of M, which provides an alternative measurement to validate the hypercapnic calibration of the BOLD signal.

Yucel, Meryem A.; Huppert, Theodore J.; Boas, David A.; Gagnon, Louis

2012-01-01

30

Calibrating the BOLD signal during a motor task using an extended fusion model incorporating DOT, BOLD and ASL data.  

PubMed

Multimodal imaging improves the accuracy of the localization and the quantification of brain activation when measuring different manifestations of the hemodynamic response associated with cerebral activity. In this study, we incorporated cerebral blood flow (CBF) changes measured with arterial spin labeling (ASL), Diffuse Optical Tomography (DOT) and blood oxygen level-dependent (BOLD) recordings to reconstruct changes in oxy- (?HbO(2)) and deoxyhemoglobin (?HbR). Using the Grubb relation between relative changes in CBF and cerebral blood volume (CBV), we incorporated the ASL measurement as a prior to the total hemoglobin concentration change (?HbT). We applied this ASL fusion model to both synthetic data and experimental multimodal recordings during a 2-s finger-tapping task. Our results show that the new approach is very powerful in estimating ?HbO(2) and ?HbR with high spatial and quantitative accuracy. Moreover, our approach allows the computation of baseline total hemoglobin concentration (HbT(0)) as well as of the BOLD calibration factor M on a single subject basis. We obtained an average HbT(0) of 71 ?M, an average M value of 0.18 and an average increase of 13% in cerebral metabolic rate of oxygen (CMRO(2)), all of which are in agreement with values previously reported in the literature. Our method yields an independent measurement of M, which provides an alternative measurement to validate the hypercapnic calibration of the BOLD signal. PMID:22546318

Yücel, Meryem A; Huppert, Theodore J; Boas, David A; Gagnon, Louis

2012-04-23

31

Piezoceramic Ultrasonic Motor Technology  

Microsoft Academic Search

The objective of this project was to team Aerotech and AlliedSignal FM and T (AS) to develop a cost-efficient process for small-batch, high performance PZT motor production. Aerotech would acquire the basic process expertise in motor fabrication, assembly, and testing from AS. Together, Aerotech and AS were to identify appropriate process improvements, focusing on raw material quality, manufacturing processes, and

1999-01-01

32

GENERAL IMMUNOLOGY ACQUIRED IMMUNITY  

Technology Transfer Automated Retrieval System (TEKTRAN)

This review, for the 2005 American Association of Swine Veterinarians (AASV) annual meeting, summarizes the swine acquired immune response. The swine immune system is comprised of both innate and acquired components. Whereas the innate immune system confers initial protection, the acquired, or adapt...

33

[Research on the surface electromyography signal decomposition based on multi-channel signal fusion analysis].  

PubMed

The decomposition method of surface electromyography (sEMG) signals was explored by using the multi-channel information extraction and fusion analysis to acquire the motor unit action potential (MUAP) patterns. The action potential waveforms were detected with the combined method of continuous wavelet transform and hypothesis testing, and the effective detection analysis was judged with the multi-channel firing processes of motor units. The cluster number of MUAPs was confirmed by the hierarchical clustering technique, and then the decomposition was implemented by the fuzzy k-means clustering algorithms. The unclassified waveforms were processed by the template matching and peel-off methods. The experimental results showed that several kinds of MUAPs were precisely extracted from the multi-channel sEMG signals. The space potential distribution information of motor units could be satisfyingly represented by the proposed decomposition method. PMID:23198440

Li, Qiang; Yang, Jihai

2012-10-01

34

10 CFR 490.304 - Which new light duty motor vehicles are covered.  

Code of Federal Regulations, 2013 CFR

... false Which new light duty motor vehicles are covered. 490.304 Section...490.304 Which new light duty motor vehicles are covered. (a) General...part applies to all light duty motor vehicles newly acquired for use...

2013-01-01

35

Repetitive Transcranial Magnetic Stimulation to the Primary Motor Cortex Interferes with Motor Learning by Observing  

ERIC Educational Resources Information Center

Neural representations of novel motor skills can be acquired through visual observation. We used repetitive transcranial magnetic stimulation (rTMS) to test the idea that this "motor learning by observing" is based on engagement of neural processes for learning in the primary motor cortex (M1). Human subjects who observed another person learning…

Brown, Liana E.; Wilson, Elizabeth T.; Gribble, Paul L.

2009-01-01

36

Repetitive Transcranial Magnetic Stimulation to the Primary Motor Cortex Interferes with Motor Learning by Observing  

ERIC Educational Resources Information Center

|Neural representations of novel motor skills can be acquired through visual observation. We used repetitive transcranial magnetic stimulation (rTMS) to test the idea that this "motor learning by observing" is based on engagement of neural processes for learning in the primary motor cortex (M1). Human subjects who observed another person learning…

Brown, Liana E.; Wilson, Elizabeth T.; Gribble, Paul L.

2009-01-01

37

Laboratory-Acquired Mycoses.  

National Technical Information Service (NTIS)

The most widely quoted of studies that summarize cases of laboratory-acquired infections are by Sulkin and Pike, who included laboratory-acquired infections in the U.S. from 1930 to 1950 and worldwide infections from 1950 to 1963. Because these studies do...

E. Hanel R. H. Kruse

1967-01-01

38

Laboratory?Acquired Infections  

Microsoft Academic Search

Laboratory-acquired infections due to a wide variety of bacteria, viruses, fungi, and parasites have been described. Although the precise risk of infection after an exposure remains poorly defined, surveys of laboratory-acquired infections suggest that Brucella species, Shigella species, Salmonella species, Mycobacterium tuberculosis, and Neisseria meningitidis are the most common causes. Infections due to the bloodborne pathogens (hepatitis B virus, hepatitis

Kamaljit Singh

2009-01-01

39

Motor Tutorials  

NSDL National Science Digital Library

This website provides tutorials with some animations on topics such as motor principles, phase angle control, pulse width modulation, and power topologies. Students can learn more about DC motors, stepper motors, brushless AC motors and more. These materials could be used as part of an in-class discussion or explored independently.

2013-06-13

40

Motor imagery facilitates force field learning.  

PubMed

Humans have the ability to produce an internal reproduction of a specific motor action without any overt motor output. Recent findings show that the processes underlying motor imagery are similar to those active during motor execution and both share common neural substrates. This suggests that the imagery of motor movements might play an important role in acquiring new motor skills. In this study we used haptic robot in conjunction with motor imagery technique to improve learning in a robot-based adaptation task. Two groups of subjects performed reaching movements with or without motor imagery in a velocity-dependent and position-dependent mixed force field. The groups performed movements with motor imagery produced higher after effects and decreased muscle co-contraction with respect to no-motor imagery group. These results showed a positive influence of motor imagery on acquiring new motor skill and suggest that motor learning can be facilitated by mental practice and could be used to increase the rate of adaptation. PMID:21555118

Anwar, Muhammad Nabeel; Tomi, Naoki; Ito, Koji

2011-04-21

41

[Laboratory-acquired brucellosis].  

PubMed

Brucellosis is a rare disease in Denmark. We describe one case of laboratory-acquired brucellosis from an index patient to a laboratory technician following exposure to an infected blood culture in a clinical microbiology laboratory. PMID:18565306

Fabiansen, Christian; Knudsen, Jenny Dahl; Lebech, Anne-Mette K

2008-06-01

42

Developmental contributions to motor sequence learning  

Microsoft Academic Search

Little is known about how children acquire new motor sequences. In particular, it is not clear if the same learning progression\\u000a observed in adults is also present in childhood nor whether motor skills are acquired in a similar fashion across development.\\u000a In the present study we used the multi-finger sequencing task (MFST), a variant of the serial reaction time (SRT)

Tal Savion-Lemieux; Jennifer A. Bailey; Virginia B. Penhune

2009-01-01

43

Acquired Immunity to Malaria  

PubMed Central

Naturally acquired immunity to falciparum malaria protects millions of people routinely exposed to Plasmodium falciparum infection from severe disease and death. There is no clear concept about how this protection works. There is no general agreement about the rate of onset of acquired immunity or what constitutes the key determinants of protection; much less is there a consensus regarding the mechanism(s) of protection. This review summarizes what is understood about naturally acquired and experimentally induced immunity against malaria with the help of evolving insights provided by biotechnology and places these insights in the context of historical, clinical, and epidemiological observations. We advocate that naturally acquired immunity should be appreciated as being virtually 100% effective against severe disease and death among heavily exposed adults. Even the immunity that occurs in exposed infants may exceed 90% effectiveness. The induction of an adult-like immune status among high-risk infants in sub-Saharan Africa would greatly diminish disease and death caused by P. falciparum. The mechanism of naturally acquired immunity that occurs among adults living in areas of hyper- to holoendemicity should be understood with a view toward duplicating such protection in infants and young children in areas of endemicity.

Doolan, Denise L.; Dobano, Carlota; Baird, J. Kevin

2009-01-01

44

Nuclear fusion  

Microsoft Academic Search

The advantages of nuclear fusion as an energy source and research progress in this area are summarized. The current state of the art is described. Laser fusion, inertial confinement fusion, and magnetic fusion (the tokamak) are explained, the latter in some detail. Remaining problems and planned future reactors are considered. They are the Compact Ignition Tokamak (CIT), the International Thermonuclear

T. K. Fowler

1989-01-01

45

Motor Cortex Reorganization across the Lifespan  

ERIC Educational Resources Information Center

The brain is a highly dynamic structure with the capacity for profound structural and functional change. Such neural plasticity has been well characterized within motor cortex and is believed to represent one of the neural mechanisms for acquiring and modifying motor behaviors. A number of behavioral and neural signals have been identified that…

Plowman, Emily K.; Kleim, Jeffrey A.

2010-01-01

46

Motor Cortex Reorganization across the Lifespan  

ERIC Educational Resources Information Center

|The brain is a highly dynamic structure with the capacity for profound structural and functional change. Such neural plasticity has been well characterized within motor cortex and is believed to represent one of the neural mechanisms for acquiring and modifying motor behaviors. A number of behavioral and neural signals have been identified that…

Plowman, Emily K.; Kleim, Jeffrey A.

2010-01-01

47

Motor imagery  

Microsoft Academic Search

We describe general concepts about motor imagery and differences to motor execution. The problem of controlling what the subject actually does during imagery is emphasized. A major part of the chapter is dealing with mental training by imagery and the usage of motor imagination in athletes, musicians and during rehabilitation. Data of altered representations of the body after loss of

Martin Lotze; Ulrike Halsband

2006-01-01

48

Acquired brain injury  

Microsoft Academic Search

Acquired brain injury in childhood is not uncommon and arises from trauma, metabolic conditions, CNS tumours and infection, toxins or as a result of treatment. Injury to the brain can occur any time from just after conception onwards. Age of injury is a critical variable in determining outcome, as is the mechanism of injury. When the brain is in a

Judith A Middleton

2005-01-01

49

Laboratory-acquired brucellosis.  

PubMed

We report two laboratory-acquired Brucella melitensis infections that were shown to be epidemiologically related. Blood culture isolates were initially misidentified because of variable Gram stain results, which led to misdiagnoses and subsequent laboratory exposures. Notifying laboratory personnel who unknowingly processed cultures from brucellosis patients is an important preventive measure. PMID:15504276

Noviello, Stephanie; Gallo, Richard; Kelly, Molly; Limberger, Ronald J; DeAngelis, Karen; Cain, Louise; Wallace, Barbara; Dumas, Nellie

2004-10-01

50

Developmental and Acquired Dyslexias  

Microsoft Academic Search

Marshall (1984) highlighted potential parallels between children with developmental disorders of reading and adults who had acquired reading disorders. He advocated the use of a cognitive neuropsychological framework in the investigation of children with developmental abnormalities of cognition, including those with developmental dyslexias.Developmental phonological dyslexia has been extensively described and is a pervasive disorder. The relationship between reading difficulty and

Christine M. Temple

2006-01-01

51

Laboratory-acquired infections.  

PubMed

Laboratory-acquired infections due to a wide variety of bacteria, viruses, fungi, and parasites have been described. Although the precise risk of infection after an exposure remains poorly defined, surveys of laboratory-acquired infections suggest that Brucella species, Shigella species, Salmonella species, Mycobacterium tuberculosis, and Neisseria meningitidis are the most common causes. Infections due to the bloodborne pathogens (hepatitis B virus, hepatitis C virus, and human immunodeficiency virus) remain the most common reported viral infections, whereas the dimorphic fungi are responsible for the greatest number of fungal infections. Because of the increasing attention on the role of the laboratory in bioterrorism preparation, I discuss the risk of laboratory-acquired infection with uncommon agents, such as Francisella tularensis and Bacillus anthracis. Physicians who care for a sick laboratory worker need to consider the likelihood of an occupationally acquired infection while advising exposed laboratory workers about postexposure prophylaxis. In addition, physicians should be aware of the importance of alerting the laboratory if infection with a high-risk agent is suspected. PMID:19480580

Singh, Kamaljit

2009-07-01

52

Community-acquired pneumonia  

Microsoft Academic Search

Community-acquired pneumonia (CAP) is a significant cause of morbidity and mortality in all age groups, especially the elderly, which is a patient population that continues to grow. Recently the spectrum and clinical picture of pneumonia has been changing as a reflection of this aging population; this requires a reassessment of and a new approach to the patient with pneumonia. Currently,

Michael S. Nieclerman

1998-01-01

53

Molecular motors  

NASA Astrophysics Data System (ADS)

Life implies movement. Most forms of movement in the living world are powered by tiny protein machines known as molecular motors. Among the best known are motors that use sophisticated intramolecular amplification mechanisms to take nanometre steps along protein tracks in the cytoplasm. These motors transport a wide variety of cargo, power cell locomotion, drive cell division and, when combined in large ensembles, allow organisms to move. Motor defects can lead to severe diseases or may even be lethal. Basic principles of motor design and mechanism have now been derived, and an understanding of their complex cellular roles is emerging.

Schliwa, Manfred; Woehlke, Günther

2003-04-01

54

Motor imagery.  

PubMed

We describe general concepts about motor imagery and differences to motor execution. The problem of controlling what the subject actually does during imagery is emphasized. A major part of the chapter is dealing with mental training by imagery and the usage of motor imagination in athletes, musicians and during rehabilitation. Data of altered representations of the body after loss of afferent information and motor representation due to limb amputation or complete spinal cord injury are demonstrated and discussed. Finally we provide an outlook on additional work about motor imagery important for further understanding of the topic. PMID:16716573

Lotze, Martin; Halsband, Ulrike

2006-05-22

55

Biometric liveness checking using multimodal fuzzy fusion  

Microsoft Academic Search

In this paper we propose a novel fusion protocol based on fuzzy fusion of face and voice features for checking liveness in secure identity authentication systems based on face and voice biometrics. Liveness checking can detect fraudulent impostor attacks on the security systems, and ensure that biometric cues are acquired from a live person who is actually present at the

Girija Chetty

2010-01-01

56

What's Motor Development Got to Do with Physical Education?  

ERIC Educational Resources Information Center

|Through the study of motor development, the physically educated person will understand that individuals develop at their own rate and require both time and practice to acquire new motor skills. The physically educated person needs to know about motor development in order to monitor his or her own change and become an independent learner.…

Williams, Kathleen

2004-01-01

57

Rotor Constructions for a High-Speed Induction Motor.  

National Technical Information Service (NTIS)

The motivation of this work was to identify the changes in the optimal design of a high-speed induction motor in comparison to a conventional motor design. The aim was acquire knowledge on how to build good high-speed induction motors. Special attention w...

J. Laehteenmaeki

2001-01-01

58

Acquired Atrioventricular Block  

Microsoft Academic Search

There are many causes of atrioventricular (AV) block but progressive idiopathic fibrosis of the conduction system related\\u000a to an aging process of the cardiac skeleton is the most common cause of chronic acquired AV block. Barring congenital AV block,\\u000a Lyme disease is the most common cause of reversible third-degree AV block in young individuals and it is usually AV nodal.

S. Serge Barold; Bengt Herweg

59

Acquired Resistance in Arabidopsis  

Microsoft Academic Search

Acquired resistance is an important component of the complex disease resistance mechanism in plants, which can result from either pathogen infection or treatment with\\\\synthetic, resistance-inducing compounds. In this study, Arabidopsis, a tractable genetic system, is shown to develop resistance to a bacterial and a fungal pathogen following 2,6- dichloroisonicotinic acid (INA) treatment. Three proteins that accumulated to high levels in

Scott Uknes; Brigitte Mauch-Mani; Mary Moyer; Sharon Potter; Sandra Dincher; Danielle Chandler; Alan Slusarenko; Eric Ward; John Ryals

1992-01-01

60

Acquired myopathy/dystrophies.  

PubMed

Diseases of muscle may be congenital or acquired. They cause muscle weakness without sensory loss. The onset, distribution, and clinical course help to differentiate the type of muscle disorder. The diagnostic workup may include laboratory examination, electrodiagnostic studies, and muscle biopsy. A definitive diagnosis leads to better decision making with regard to treatment, genetic education, prognosis, functional expectations, and the impact of exercise on muscle function. PMID:23584160

Chiodo, Anthony

2013-04-11

61

Acquired Brain Pathology  

Microsoft Academic Search

\\u000a Acute brain injury is rarely seen, but salient features include acute hemorrhage, thrombosis, and localized or general edema.\\u000a Findings are rarely specific with regard to etiology. In addition to maternal disease, risk factors for acquired brain lesions\\u000a include disorders of the placenta and\\/or umbilical cord, exposure to toxic agents, metabolic disease, iatrogenic hazards,\\u000a fetal cardiovascular disease, and space-occupying lesions. Most

Daniela Prayer; Ulrika Asenbaum; Peter C. Brugger; Gregor Kasprian

62

School Reentry for Children with Acquired Central Nervous Systems Injuries  

ERIC Educational Resources Information Center

|Onset of acquired central nervous system (CNS) injury during the normal developmental process of childhood can have impact on cognitive, behavioral, and motor function. This alteration of function often necessitates special education programming, modifications, and accommodations in the education setting for successful school reentry. Special…

Carney, Joan; Porter, Patricia

2009-01-01

63

Neuropsychological Findings in Congenital and Acquired Childhood Hydrocephalus  

Microsoft Academic Search

Hydrocephalus is an increase in cerebrospinal fluid volume that can be caused by a variety of etiologies. The most common connatal and acquired causes of hydrocephalus are spina bifida, aqueduct stenosis, and preterm low birthweight infants with ventricular hemorrhage. In general, the literature suggests mild neuropsychological deficits associated with hydrocephalus, which are predominant in visuospatial and motor functions, and other

Maria Mataró; Carme Junqué; MariaAntonia Poca; Juan Sahuquillo

2001-01-01

64

Nuclear Fusion  

NASA Astrophysics Data System (ADS)

This chapter is devoted to the fundamental concepts of nuclear fusion. To be more precise, it is devoted to the theoretical basics of fusion reactions between light nuclei such as hydrogen, helium, boron, and lithium. The discussion is limited because our purpose is to focus on laboratory-scale fusion experiments that aim at gaining energy from the fusion process. After discussing the methods of calculating the fusion cross section, it will be shown that sustained fusion reactions with energy gain must happen in a thermal medium because, in beam-target experiments, the energy of the beam is randomized faster than the fusion rate. Following a brief introduction to the elements of plasma physics, the chapter is concluded with the introduction of the most prominent fusion reactions ongoing in the Sun.

Veres, G.

65

Mirror fusion  

NASA Astrophysics Data System (ADS)

Progress reported in the mirror fusion energy program covers (1) fusion, plasma theory, and computation; (2) magnetic mirror system and tandem mirror experiments; (3) superconducting magnetic development; (4) fusion reactor materials; (5) experiments in the mirror fusion test facility; and (6) design and construction of the facility. Topics covered include fiber optic communication links; desorption of deuterium and contaminants; neutral beam injection; operating point for the Yin-Yang cell; and reverse field pinch.

Harrison, M. A.; McGregor, C. K.

1980-07-01

66

Fault classification for induction motor using Hilbert-based bispectral analysis and probabilistic neural networks  

Microsoft Academic Search

This paper addresses the development of a new sig- nal processing approach based on the fusion of Hilbert transform and bispectral analysis to extract features of defects in a number of induction motor conditions. The motor conditions considered are a normal motor and motors with outer, inner race and rotor faults. The signal processing techniques based on Hilbert transform have

D.-M. Yang

2011-01-01

67

Fusion power  

Microsoft Academic Search

Fusion, which powers the sun and stars, is potentially an environmentally responsible and intrinsically safe source of essentially limitless energy on earth. The potential of fusion has been recognized for over 65 years, but mastering fusion on earth has proved to be an enormous scientific and technical challenge. It involves heating a large volume of dilute gas, containing equal parts

CHRIS LLEWELLYN-SMITH; DAVID WARD

2005-01-01

68

Motorized Car  

NSDL National Science Digital Library

In this design challenge activity, learners build a car that uses a battery-operated motor to "drive" at least ten feet. Educators can use this activity as a fun, hands-on way to introduce the design process as well as circuitry and motors to learners.

Wgbh

2010-01-01

69

Acquiring Disambiguation Rules from Text  

Microsoft Academic Search

An effective procedure for automatically acquiring a new set of disambiguation rules for an existing deterministic parser on the basis of tagged text is presented. Performance of the automatically acquired rules is much better than the existing hand-written disambiguation rules. The success of the acquired rules depends on using the linguistic information encoded in the parser; enhancements to various components

Donald Hindle

1989-01-01

70

Fusion Implementation  

SciTech Connect

If a fusion DEMO reactor can be brought into operation during the first half of this century, fusion power production can have a significant impact on carbon dioxide production during the latter half of the century. An assessment of fusion implementation scenarios shows that the resource demands and waste production associated with these scenarios are manageable factors. If fusion is implemented during the latter half of this century it will be one element of a portfolio of (hopefully) carbon dioxide limiting sources of electrical power. It is time to assess the regional implications of fusion power implementation. An important attribute of fusion power is the wide range of possible regions of the country, or countries in the world, where power plants can be located. Unlike most renewable energy options, fusion energy will function within a local distribution system and not require costly, and difficult, long distance transmission systems. For example, the East Coast of the United States is a prime candidate for fusion power deployment by virtue of its distance from renewable energy sources. As fossil fuels become less and less available as an energy option, the transmission of energy across bodies of water will become very expensive. On a global scale, fusion power will be particularly attractive for regions separated from sources of renewable energy by oceans.

J.A. Schmidt

2002-02-20

71

"Polarized" Fusion  

NASA Astrophysics Data System (ADS)

Increasing energy demand in view of limited supply, as well as environmental and nuclear-safety concerns leading to increased emphasis on renewable energy sources such as solar or wind energy are expected to focus public and scientific interest increasingly also on fusion energy. With the decision to build ITER (low-density magnetic confinement) and also continuing research on (high-density) inertial-confinement fusion (cf. the inauguration of the laser fusion facility at the Lawrence Livermore National Laboratory) prospects of fusion energy have probably entered a new era.

Schieck, Hans Paetz Gen.

72

Ultrasonic Motors.  

National Technical Information Service (NTIS)

Ultrasonic motors, which have superior characteristics like high torque at low speed, absence of magnetic interference, and compactness in size, are good candidates for medical applications, automation, robotics, aerospace engineering and various other fi...

S. Cagatay K. Uchino B. Koc

2003-01-01

73

Developmental and acquired dyslexias.  

PubMed

Marshall (1984) highlighted potential parallels between children with developmental disorders of reading and adults who had acquired reading disorders. He advocated the use of a cognitive neuropsychological framework in the investigation of children with developmental abnormalities of cognition, including those with developmental dyslexias. Developmental phonological dyslexia has been extensively described and is a pervasive disorder. The relationship between reading difficulty and phonological difficulties evident in explicit oral phonological tasks continues to be a focus for debate. Clear cases of developmental deep dyslexia have now been described and the syndrome has also been described as characterising early reading development in Williams syndrome (WS), where there are also semantic errors in other domains, including naming and receptive vocabulary and there may be a generalised difficulty with the activation of fine grain semantic specifications. In the domain of number, highly selective reading disorders characterised by high rates of semantic errors have been documented, indicating that semantic reading errors can be domain-specific. They can occur to number words despite intact ability to read Arabic numbers and they can occur to Arabic numbers and number words despite intact ability to read words in other domains. Current models of reading written words do not allow for such material-specific dissociation. Developmental surface dyslexia has also been described in a range of countries, languages and orthographies. Descriptions of cases for whom there is no phonological impairment in reading have generated contrary evidence for theories suggesting that phonological impairment underlies all developmental dyslexia. As reading develops in Williams Syndrome, phonological reading skills may improve with over-reliance on these leading to surface dyslexia. Surface dyslexia has also been reported in cases of developmental amnesia in which there are semantic memory impairments. Hyperlexia can take several forms including broad hyperdevelopment with elevated phonological reading abilities, lexico-semantic reading abilities and reading comprehension as in Turner's syndrome (TS). This advantage has early onset in school-starters. These specific modular effects do not have pervasive impact across systems but demonstrate the limitations of functional plasticity in developmental and genetic disorders. The framework Marshall (1984) outlined has provided a foundation for the development of systematic investigation of developmental disorders. PMID:17131596

Temple, Christine M

2006-08-01

74

Children Acquire Emotion Categories Gradually  

ERIC Educational Resources Information Center

Some accounts imply that basic-level emotion categories are acquired early and quickly, whereas others imply that they are acquired later and more gradually. Our study examined this question for fear, happiness, sadness, and anger in the context of children's categorization of emotional facial expressions. Children (N=168, 2-5 years) first labeled…

Widen, Sherri C.; Russell, James A.

2008-01-01

75

Fusion Power.  

ERIC Educational Resources Information Center

|Discusses the extraordinary potential, the technical difficulties, and the financial problems that are associated with research and development of fusion power plants as a major source of energy. (GA)|

Dingee, David A.

1979-01-01

76

Fusion Power.  

ERIC Educational Resources Information Center

Discusses the extraordinary potential, the technical difficulties, and the financial problems that are associated with research and development of fusion power plants as a major source of energy. (GA)

Dingee, David A.

1979-01-01

77

Infants with Down Syndrome: Percentage and Age for Acquisition of Gross Motor Skills  

ERIC Educational Resources Information Center

|The literature is bereft of information about the age at which infants with Down syndrome (DS) acquire motor skills and the percentage of infants that do so by the age of 12 months. Therefore, it is necessary to identify the difference in age, in relation to typical infants, at which motor skills were acquired and the percentage of infants with…

Pereira, Karina; Basso, Renata Pedrolongo; Lindquist, Ana Raquel Rodrigues; da Silva, Louise Gracelli Pereira; Tudella, Eloisa

2013-01-01

78

Ultrasonic Motor,  

National Technical Information Service (NTIS)

As electronics represented by computers make progress, comparable actuators of small size and high-speed response are in strong demand. This ultrasonic motor is based on an utterly new principle where the rotating force is obtained by an ultrasonic vibrat...

A. Tokushima N. Harao K. Takahashi N. Sugano R. Inaba

1987-01-01

79

Ultrasonic motors  

Microsoft Academic Search

An ultrasonic motor is proposed which uses two piezoelectric elements in the stator. One element is used to generate a vibration polarized with respect to the direction of motion of the rotor or the slider. The other one generates a vibration perpendicular to the motion of the rotor. By imaging the ratio of the vibration amplitudes and the phase, the

S. Ueha; M. Kurosawa

1988-01-01

80

Theoretical solid-propellant rocket motor internal ballistic performance  

Microsoft Academic Search

Theoretical methods for calculating solid-propellant rocket motor (SRM) internal ballistic performance were investigated and demonstrated through application to a full-scale Minuteman III Stage III motor (MM III SIII). The propellant grain burning surface location as a function of time and internal ballistic performance were calculated and compared to experimental data previously acquired at the Arnold Engineering Development Center (AEDC). Propellant

R. W. McAmis; T. V. Le

1992-01-01

81

Latent Structure of Motor Abilities in Pre-School Children  

ERIC Educational Resources Information Center

|The theoretical and practical knowledge which have so far been acquired through work with pre-school children pointed to the conclusion that the structures of the latent dimensions of the motor abilities differ greatly from such a structure, in pre-school children and adults alike. Establishing the latent structure of the motor abilities in…

Vatroslav, Horvat

2011-01-01

82

Lateral Transpsoas Fusion: Indications and Outcomes  

PubMed Central

Spinal fusion historically has been used extensively, and, recently, the lateral transpsoas approach to the thoracic and lumbar spine has become an increasingly common method to achieve fusion. Recent literature on this approach has elucidated its advantage over more traditional anterior and posterior approaches, which include a smaller tissue dissection, potentially lower blood loss, no need for an access surgeon, and a shorter hospital stay. Indications for the procedure have now expanded to include degenerative disc disease, spinal stenosis, degenerative scoliosis, nonunion, trauma, infection, and low-grade spondylolisthesis. Lateral interbody fusion has a similar if not lower rate of complications compared to traditional anterior and posterior approaches to interbody fusion. However, lateral interbody fusion has unique complications that include transient neurologic symptoms, motor deficits, and neural injuries that range from 1 to 60% in the literature. Additional studies are required to further evaluate and monitor the short- and long-term safety, efficacy, outcomes, and complications of lateral transpsoas procedures.

Patel, Vishal C.; Park, Daniel K.; Herkowitz, Harry N.

2012-01-01

83

Lateral transpsoas fusion: indications and outcomes.  

PubMed

Spinal fusion historically has been used extensively, and, recently, the lateral transpsoas approach to the thoracic and lumbar spine has become an increasingly common method to achieve fusion. Recent literature on this approach has elucidated its advantage over more traditional anterior and posterior approaches, which include a smaller tissue dissection, potentially lower blood loss, no need for an access surgeon, and a shorter hospital stay. Indications for the procedure have now expanded to include degenerative disc disease, spinal stenosis, degenerative scoliosis, nonunion, trauma, infection, and low-grade spondylolisthesis. Lateral interbody fusion has a similar if not lower rate of complications compared to traditional anterior and posterior approaches to interbody fusion. However, lateral interbody fusion has unique complications that include transient neurologic symptoms, motor deficits, and neural injuries that range from 1 to 60% in the literature. Additional studies are required to further evaluate and monitor the short- and long-term safety, efficacy, outcomes, and complications of lateral transpsoas procedures. PMID:23213303

Patel, Vishal C; Park, Daniel K; Herkowitz, Harry N

2012-11-06

84

Synchronous Motor Railcar Propulsion  

Microsoft Academic Search

Development of ac motor drives for rail transit car has centered on the induction motor with pulsewidth modulated (PWM) inverter control. Interest in the induction motor as a replace for the series dc traction motor stems from the simplicity of the squirrel cage rotor of the induction motor. In this article, the short-comings of PWM inverter-induction motor transit car drive

Frank J. Bourbeau

1977-01-01

85

Advanced Motors  

SciTech Connect

Project Summary Transportation energy usage is predicted to increase substantially by 2020. Hybrid vehicles and fuel cell powered vehicles are destined to become more prominent as fuel prices rise with the demand. Hybrid and fuel cell vehicle platforms are both dependent on high performance electric motors. Electric motors for transportation duty will require sizeable low-speed torque to accelerate the vehicle. As motor speed increases, the torque requirement decreases which results in a nearly constant power motor output. Interior permanent magnet synchronous motors (IPMSM) are well suited for this duty. , , These rotor geometries are configured in straight lines and semi circular arc shapes. These designs are of limited configurations because of the lack of availability of permanent magnets of any other shapes at present. We propose to fabricate rotors via a novel processing approach where we start with magnet powders and compact them into a net shape rotor in a single step. Using this approach, widely different rotor designs can be implemented for efficiency. The current limitation on magnet shape and thickness will be eliminated. This is accomplished by co-filling magnet and soft iron powders at specified locations in intricate shapes using specially designed dies and automatic powder filling station. The process fundamentals for accomplishing occurred under a previous Applied Technology Program titled, ���������������¢��������������������������������Motors and Generators for the 21st Century���������������¢�������������������������������. New efficient motor designs that are not currently possible (or cost prohibitive) can be accomplished by this approach. Such an approach to motor fabrication opens up a new dimension in motor design. Feasibility Results We were able to optimize a IPMSM rotor to take advantage of the powder co-filling and DMC compaction processing methods. The minimum low speed torque requirement of 5 N-m can be met through an optimized design with magnet material having a Br capability of 0.2 T. This level of magnetic performance can be met with a variety of bonded magnet compositions. The torque ripple was found to drop significantly by using thinner magnet segments. The powder co-filling and subsequent compaction processing allow for thinner magnet structures to be formed. Torque ripple can be further reduced by using skewing and pole shaping techniques. The techniques can be incorporated into the rotor during the powder co-filling process.

Knoth, Edward A.; Chelluri, Bhanumathi; Schumaker, Edward J.

2012-12-14

86

Multifocus microscope image fusion analysis based on Daubechies wavelets  

NASA Astrophysics Data System (ADS)

We present in this work a multifocus image fusion algorithm based on wavelet transforms applied to multifocus microscopy images acquired by the bright-field technique. The fusion scheme is based on the Daubechies family transforms. Experimental results are presented using metallic samples.

Padilla-Vivanco, Alfonso; Toxqui-Quitl, Carina; Santiago-Tepantlan, C.

2009-06-01

87

Biometric liveness detection based on cross modal fusion  

Microsoft Academic Search

In this paper we propose liveness checking technique for multimodal biometric authentication systems based on audio-visual cross-modal fusion. Liveness checking ensures that biometric cues are acquired from a live person who is actually present at the time of capture for authenticating the identity. The liveness check based on mutual dependency models is performed by fusion of acoustic and visual speech

Girija Chetty

2009-01-01

88

Hospital-acquired pneumonia (image)  

MedlinePLUS

Pneumonia acquired in the hospital is a very serious infection because the patient's defense mechanisms are often impaired by illness, and the infecting organisms are more dangerous than the ones generally encountered in the community.

89

Linear Induction Motor Electrical Performance Test.  

National Technical Information Service (NTIS)

This report describes the electrical performance characteristics of a 2500-hp (at 250 mph) linear induction motor (LIM), based on data acquired while propelling the LIM research vehicle over a 0-to-250-mph speed range. Pertinent LIM design information is ...

R. B. Powell

1976-01-01

90

Universal acquired melanosis: carbon baby.  

PubMed

We report a 3-year-old boy born with light brown skin that progressively became much darker. The color change was insidious in onset at the age of 3 months, asymptomatic, and progressive involving the entire body surface. Hyperpigmentation may be congenital or acquired, hereditary or nonhereditary, localized or universal, of known or unknown origin. Universal acquired melanosis is a rare form of hyperpigmentation, which has been synonymously referred to as ''carbon baby.'' PMID:24010507

Niiyama, Shiro; Bando, Yuki; Ishii, Masahiro; Katsuoka, Kensei

2013-07-14

91

Children acquire emotion categories gradually  

Microsoft Academic Search

Some accounts imply that basic-level emotion categories are acquired early and quickly, whereas others imply that they are acquired later and more gradually. Our study examined this question for fear, happiness, sadness, and anger in the context of children's categorization of emotional facial expressions. Children (N=168, 2–5 years) first labeled facial expressions of six emotions and were then shown a

Sherri C. Widen; James A. Russell

2008-01-01

92

Data fusion for the detection of buried land mines  

SciTech Connect

The authors conducted experiments to demonstrate the enhanced delectability of buried land mines using sensor fusion techniques. Multiple sensors, including imagery, infrared imagery, and ground penetrating radar, have been used to acquire data on a number of buried mines and mine surrogates. The authors present this data along with a discussion of the application of sensor fusion techniques for this particular detection problem. The authors describe the data fusion architecture and discuss some relevant results of these classification methods.

Clark, G.A.; Sengupta, S.K.; Schaich, P.C.; Sherwood, R.J.; Buhl, M.R.; Hernandez, J.E.; Kane, R.J.; Barth, M.J.; Fields, D.J.; Carter, M.R.

1993-10-01

93

MICROCONTROLLER BASED THREE-PHASE INDUCTION MOTOR PROTECTION RELAY WITH OPERATOR SELECTABLE THERMAL IT CURVE FEATURE  

Microsoft Academic Search

This paper presents a Microcontroller based three phase induction motor protection relay. The scheme employs the Hall effect current transducers for sensing motor line currents, and an ‘Auto ranging ’ feature, in order to acquire motor line currents accurately from no load to blocked rotor current. The flexibility of ‘Operator selectable thermal current versus time (I-T) curves feature’ is incorporated

K. PANDURANGAVITTAL; D. B. FAKRUDDIN; I. RAGHAVENDRA RAO; K. PARTHASARATHY

1998-01-01

94

Stuttering Following Acquired Brain Damage: A Review of the Literature.  

PubMed

Communication problems resulting from acquired brain damage are most frequently manifested as motor speech disorders such as dysarthria, syndromes of aphasia, and impairments of pragmatics. A much less common phenomenon is the onset of stuttering in adults who sustain a stroke, traumatic brain injury, or other neurologic events. When stuttering occurs in association with neuropathology, precise characterization and explanation of observed behaviors is often difficult. Among the clinical challenges presented by acquired stuttering are the problem of distinguishing this form of dysfluency from those associated with dysarthria and aphasia, and identifying the neuropathological condition(s) and brain lesion site(s) giving rise to this speech disorder. Another challenge to the precise characterization of acquired stuttering is the fact that some cases of acquired stuttering apparently have a psychological or neuropsychiatric genesis rather than a neuropathological one. In this paper we provide a review of the literature pertaining to the complicated phenomenon of acquired stuttering in adults and draw some tentative explanatory conclusions regarding this disorder. PMID:20628582

Lundgren, Kristine; Helm-Estabrooks, Nancy; Klein, Reva

2010-09-01

95

Stuttering Following Acquired Brain Damage: A Review of the Literature  

PubMed Central

Communication problems resulting from acquired brain damage are most frequently manifested as motor speech disorders such as dysarthria, syndromes of aphasia, and impairments of pragmatics. A much less common phenomenon is the onset of stuttering in adults who sustain a stroke, traumatic brain injury, or other neurologic events. When stuttering occurs in association with neuropathology, precise characterization and explanation of observed behaviors is often difficult. Among the clinical challenges presented by acquired stuttering are the problem of distinguishing this form of dysfluency from those associated with dysarthria and aphasia, and identifying the neuropathological condition(s) and brain lesion site(s) giving rise to this speech disorder. Another challenge to the precise characterization of acquired stuttering is the fact that some cases of acquired stuttering apparently have a psychological or neuropsychiatric genesis rather than a neuropathological one. In this paper we provide a review of the literature pertaining to the complicated phenomenon of acquired stuttering in adults and draw some tentative explanatory conclusions regarding this disorder.

Lundgren, Kristine; Helm-Estabrooks, Nancy; Klein, Reva

2009-01-01

96

Community-acquired Acinetobacter infections.  

PubMed

Acinetobacter infections have been attracting increasing attention during recent years because they have become common in hospitalized patients, especially in the intensive care unit (ICU) setting. However, the available literature suggests that the pathogen has another fearful potential; it can cause community-acquired infections. We searched PubMed and the reference lists of the initially identified articles and identified six case series regarding a total of 80 patients with community-acquired Acinetobacter baumannii infections; from these, 51 had pneumonia and 29 had bacteremia. Of these 80 patients, 45 (56%) died of the infection. In addition, we identified 26 case reports regarding 43 patients with community-acquired Acinetobacter infections; from these, 38 had pneumonia, two had meningitis, one had soft-tissue infection, one had ocular infection, and one had native valve endocarditis. Comorbidity was commonly present in patients reported in the case series as well as the case reports, mainly, chronic obstructive pulmonary disease, renal disease, and diabetes mellitus; heavy smoking and excess alcohol consumption were also common. Most of the studies originated from China, Taiwan, and tropical Australia. We also identified 12 retrospective or prospective studies (seven from the Far East, two from Oceania, one from N. Guinea, one from Palestine, and one from USA/Canada) that reported the frequency of community-acquired Acinetobacter infections; the range of isolation of Acinetobacter from patients with community-acquired pneumonia in these studies was 1.3%-25.9%. In conclusion, most community-acquired Acinetobacter infections have been reported from countries with tropical or subtropical climate, and mainly affect patients with some form of comorbidity or are associated with heavy smoking and excess alcohol consumption. PMID:17701432

Falagas, M E; Karveli, E A; Kelesidis, I; Kelesidis, T

2007-12-01

97

Motor Effect  

NSDL National Science Digital Library

In this activity about electricity and magnetism, learners examine what happens when a magnet exerts a force on a current-carrying wire. Using a simple device, learners discover that when an electrical current flows through a magnetic field, a force is exerted on the current and this force can be used to make an electric motor. Learners will experiment to find out what happens when they reverse the direction of current flow. They will also discover a mathematical tool called the "right-hand rule."

Exploratorium, The

2012-06-26

98

Piezoelectric ultrasonic motors: overview  

Microsoft Academic Search

This paper reviews recent developments of ultrasonic motors using piezoelectric resonant vibrations. Following the historical background, ultrasonic motors using standing and traveling waves are introduced. Driving principles and motor characteristics are explained in comparison with conventional electromagnetic motors. After a brief discussion on speed and thrust calculation, finally, reliability issues of ultrasonic motors are described.

Kenji Uchino

1998-01-01

99

Etiology-specific differences in motor function after hemispherectomy.  

PubMed

Prediction of functional motor outcome after hemispherectomy is difficult due to the heterogeneity of motor outcomes observed. We hypothesize that this might be related to differences in plasticity during the onset of the underlying epileptogenic disorder or lesion and try to identify predictors of motor outcome after hemispherectomy. Thirty-five children with different etiologies (developmental, stable acquired or progressive) underwent functional hemispherectomy and motor function assessment before hemispherectomy and 24 months after hemispherectomy. Preoperatively, children with developmental etiologies performed better in terms of distal arm strength and hand function, but not on gross motor function tests. Postoperatively, the three etiology groups performed equally poor in muscle strength and hand function, but gross motor function improved in those with acquired and progressive etiologies. Loss of voluntary hand function and distal arm strength after surgery was associated with etiology, intact insular cortex and intact structural integrity of the ipsilesional corticospinal tract on presurgical MRI scans. In conclusion, postoperative motor function can be predicted more precisely based on etiology and on preoperative MRI. Children with developmental etiology more often lose distal arm strength and hand function and show less improvement in gross motor function, compared to those with acquired pathology. PMID:22974527

van der Kolk, Nicolien M; Boshuisen, Kim; van Empelen, Ron; Koudijs, Suzanne M; Staudt, Martin; van Rijen, Peter C; van Nieuwenhuizen, Onno; Braun, Kees P J

2012-09-11

100

Cold fusion: Alchemist's dream  

NASA Astrophysics Data System (ADS)

In this report the following topics relating to cold fusion are discussed: muon catalyzed cold fusion; piezonuclear fusion; sundry explanations pertaining to cold fusion; cosmic ray muon catalyzed cold fusion; vibrational mechanisms in excited states of D2 molecules; barrier penetration probabilities within the hydrogenated metal lattice/piezonuclear fusion; branching ratios of D2 fusion at low energies; fusion of deuterons into He-4; secondary D+T fusion within the hydrogenated metal lattice; helium-3 to helium-4 ratio within the metal lattice; shock induced fusion; and anomalously high isotopic ratios of helium-3/helium-4.

Clayton, E. D.

1989-09-01

101

Infrared and color visible image fusion system based on luminance-contrast transfer technique  

NASA Astrophysics Data System (ADS)

In this paper, an infrared and color image fusion algorithm based on luminance-contrast transfer technique is presented. This algorithm shall operate YCbCr transform on color visible image, and obtain the luminance component. Then, the grey-scale image fusion methods are utilized to fuse the luminance component of visible and infrared images to acquire grey-scale fusion image. After that, the grey-scale fusion image and visible image are fused to form color fusion image based on inversed YCbCr transform. To acquire better details appearance, a natural-sense color transfer fusion algorithm based on reference image is proposed. Furthermore, a real-time infrared/visible image fusion system based on FPGA is realized. Finally, this design and achievement is verified experimentally, and the experimental results show that the system can produce a color fusion image with good image quality and real-time performance.

Wang, Bo; Gong, Wenfeng; Wang, Chensheng

2012-12-01

102

Selectively Acquiring Ratings for Product  

Microsoft Academic Search

Accurate prediction of customer preferences on products is the key to any recommender systems to realize its promised strategic values such as improved customer satisfaction and therefore enhanced loyalty. In this paper, we propose proactively acquiring ratings from customers for a newly introduced product to quickly improve the accuracy of the predicted ratings generated by a collaborative filtering recommendation algorithm

103

Acquired Equivalence Changes Stimulus Representations  

ERIC Educational Resources Information Center

Acquired equivalence is a paradigm in which generalization is increased between two superficially dissimilar stimuli (or antecedents) that have previously been associated with similar outcomes (or consequents). Several possible mechanisms have been proposed, including changes in stimulus representations, either in the form of added associations or…

Meeter, M.; Shohamy, D.; Myers, C. E.

2009-01-01

104

Acquired cutaneous smooth muscle hamartoma.  

PubMed

A 35-year-old white man had an indurated, indistinct plaque on the anterior aspect of the neck for 10 years. Results of biopsy specimens showed an excess of smooth muscle bundles scattered throughout the dermis. Unlike previously reported cases of acquired smooth muscle hamartomas, it did not occur in association with a Becker nevus. PMID:8491877

Darling, T N; Kamino, H; Murray, J C

1993-05-01

105

Preputial intussusception or acquired megaprepuce.  

PubMed

Preputial intussusception, or acquired megaprepuce, is a clinical condition whose incidence is increasing. It results from infolding of the outer preputial skin, obstruction of urinary flow, and the development of a phimosis. With time the process continues, resulting in a distinctive clinical picture. Treatment by early circumcision cures the problem and allows resolution of the sequelae. PMID:9563032

Powis, M R; Capps, S

1998-03-01

106

The Inheritance of Acquired Characters  

Microsoft Academic Search

IT would be difficult to overrate the importance of the instance given by my friend Prof. Hartog in the last number of NATURE (p. 462) of the inheritance of a character acquired by habit; but the explanation which he offers of the non-inheritance of characters produced by mutilation, so far from being flat Lamarckism, appears to me to flavour of

W. J. Sollas

1889-01-01

107

Duplicated Information Acquired by Libraries.  

ERIC Educational Resources Information Center

|The object of this study is to make a start toward determining the extent of duplicated information that is being acquired in spite of customary precautions to avoid it. Referring to a specific case, the percentages in Table II show the frequency of appearance in five other works of 19 items in Mitchell's "Encyclopedia of American Politics."…

White, Carl M.

108

PROGRESS TOWARD UNDERSTANDING MAGNETIZED TARGET FUSION (MTF).  

SciTech Connect

Magnetized target fusion (MTF) takes advantage of (1) the reduction of the electron thermal conductivity in a plasma due to magnetization and (2) the efficient heating through bulk compression. MTF proposes to create a warm plasma with an embedded magnetic field and to compress it using an imploded liner or shell. The minimum energy required for fusion in an optimized target is directly proportional to the mass of the ignited fusion fuel. Simple theoretical arguments and parameter studies have demonstrated that MTF has the potential for significantly reducing the power and intensity of a target driver needed to achieve fusion. In order to acquire a comprehensive understanding of MTF and its potential applications it is prudent to develop more complete and reliable computational techniques. This paper briefly reviews the progress toward that goal.

Kirkpatrick, R. C. (Ronald C.); Lindemuth, I. R. (Irvin R.); Barnes, D. C. (Daniel C.); Faehl, R. J. (Rickey J.); Sheehey, P. T. (Peter T.); Knapp, C. E. (Charles E.)

2001-01-01

109

Sleep Contribution to Motor Memory Consolidation: A Motor Imagery Study  

PubMed Central

Study Objectives: Sleep is known to enhance performance following physical practice (PP) of a new sequence of movements. Apart from a pilot study, it is still unknown whether a similar sleep-dependent consolidation effect can be observed following motor imagery (MI) and whether this mnemonic process is related to MI speed. Design: Counterbalanced within-subject design. Setting: The laboratory. Participants: Thirty-two participants. Interventions: PP, real-time MI, fast MI, and NoSleep (control) groups. Measurements and Results: Subjects practiced an explicitly known sequence of finger movements, and were assigned to PP, real-time MI, or fast MI, in which they intentionally imagined the sequence at a faster pace. A NoSleep group subjected to real-time MI, but without any intervening sleep, was also tested. Performance was evaluated before practice, as well as prior to, and after a night of sleep or a similar time interval during the daytime. Compared with the NoSleep group, the results revealed offline gains in performance after sleep in the PP, real-time MI, and fast MI groups. There was no correlation between a measure of underestimation of the time to imagine the motor sequence and the actual speed gains after sleep, neither between the ease/difficulty to form mental images and performance gains. Conclusions: These results provide evidence that sleep contributes to the consolidation of motor sequence learning acquired through MI and further suggests that offline delayed gains are not related to the MI content per se. They extend our previous findings and strongly confirm that performance enhancement following MI is sleep dependent. Citation: Debarnot U; Creveaux T; Collet C; Doyon J; Guillot A. Sleep contribution to motor memory consolidation: a motor imagery study. SLEEP 2009;32(12):1559-1565.

Debarnot, Ursula; Creveaux, Thomas; Collet, Christian; Doyon, Julien; Guillot, Aymeric

2009-01-01

110

Constructing nanomechanical devices powered by biomolecular motors  

NASA Astrophysics Data System (ADS)

A confluence in scientific advancements associated with molecular biology and nanofabrication technology now offers the potential of engineering functional hybrid organic/inorganic nanomechanical systems. Our objectives were to: (i) establish a system for producing a recombinant biomolecular motor; (ii) precisely position and orient biological molecules on nanofabricated substrates; and (iii) acquire baseline performance data on a biomolecular motor in a hybrid system. A recombinant expression system was established for the large-scale production of a thermostable biomolecular motor, F1-ATPase, modified to contain chemically active `handles.' His tags were used to specifically attach, as well as precisely position and orient, biological molecules on nickel, copper and gold substrates created using electron beam lithography. Further, these substrates were used to attach F1-ATPase and acquire baseline performance data on motor rotation through the attachment of fluorescent microspheres to the tip of the ? subunit. Counterclockwise rotation of the ? subunit was measured at approximately 10 Hz (3-4 rev s-1) using a differential interferometer. These data have established several prerequisite technologies that are essential to the integration of biomolecular motors in nano-electro-mechanical systems. The evolution of these technologies will open the door to the seamless integration of the motive power of life with engineered nanofabricated devices.

Montemagno, Carlo; Bachand, George

1999-09-01

111

Musicality: instinct or acquired skill?  

PubMed

Is the human tendency toward musicality better thought of as the product of a specific, evolved instinct or an acquired skill? Developmental and evolutionary arguments are considered, along with issues of domain-specificity. The article also considers the question of why humans might be consistently and intensely drawn to music if musicality is not in fact the product of a specifically evolved instinct. PMID:22961931

Marcus, Gary F

2012-09-07

112

Engelhard acquires German catalyst maker  

SciTech Connect

Engelhard will acquire the precious- and base-metal catalyst businesses of Doduco GmbH & Co. (Pforzheim, Germany), a privately held supplier of catalysts to the chemical and pharmaceutical industries. {open_quotes}This is an excellent product expansion for us, one that we believe can be leveraged throughout Europe and, later, globally,{close_quotes} says James A. Martin, group v.p., president, and general manager of Engelhard`s chemical catalysts group.

NONE

1996-10-16

113

The inhibition of acquired fear  

Microsoft Academic Search

A conditioned stimulus (CS) associated with a fearsome unconditioned stimulus (US) generates learned fear. Acquired fear is\\u000a at the root of a variety of disorders, among which are phobias, generalized anxiety, and the posttraumatic stress disorder\\u000a (PTSD). The simplest way to inhibit learned fear is to extinguish it, which is usually done by repeatedly presenting the CS\\u000a alone, so that

Iván Izquierdo; Martín Cammarota; Mónica R. M. Vianna; Lía R. M. Bevilaqua

2004-01-01

114

Exploring the Use of Cognitive Intervention for Children with Acquired Brain Injury  

ERIC Educational Resources Information Center

|Introduction: Children with acquired brain injury (ABI) often experience cognitive, motor, and psychosocial deficits that affect participation in everyday activities. Cognitive Orientation to Daily Occupational Performance (CO-OP) is an individualized treatment that teaches cognitive strategies necessary to support successful performance.…

Missiuna, Cheryl; DeMatteo, Carol; Hanna, Steven; Mandich, Angela; Law, Mary; Mahoney, William; Scott, Louise

2010-01-01

115

Pure motor demyelinating neuropathy: deterioration after steroid treatment and improvement with intravenous immunoglobulin.  

PubMed Central

Within one month of starting oral prednisolone treatment weakness unexpectedly increased in four patients aged 34 to 75 years with purely motor forms of acquired chronic demyelinating neuropathy. By contrast, steroids produced the expected improvement in 11 other patients with symmetric sensorimotor chronic inflammatory demyelinating polyneuropathy. Two of the patients with purely motor demyelinating neuropathy were subsequently treated with high dose IVIg (0.4 g/kg/day for five days) with prompt improvements in strength measurements and motor nerve conduction. Thus IVIg seems to be the treatment of choice and steroids should be used with extreme caution, if at all, in patients with purely motor forms of acquired demyelinating polyneuropathy.

Donaghy, M; Mills, K R; Boniface, S J; Simmons, J; Wright, I; Gregson, N; Jacobs, J

1994-01-01

116

Horizontal fusional responses to stimuli containing artificial scotomas.  

PubMed

Horizontal fusional responses were studied with stimuli containing binocular or monocular, artificial, stabilized, scotomas. Binocular scotomas of 5-deg, 10-deg, and 15-deg diameters were utilized. The fusional responses to scotomatic stimuli were compared with full-field stimulus responses. All responses contained significant motor and nonmotor (sensory) components. Overall motor compensation to stimuli with 10-deg and 15-deg scotomas was reduced, while the overall motor compensation to stimuli with 5-deg scotomas was not. With full-field stimuli and with stimuli containing binocular scotomas, the changes in the two eyes' lines of sight were often asymmetric in response to symmetric disparity changes. This response asymmetry was exacerbated by the presence of monocular scotomas. Fixation was less steady with stimuli containing 10-deg or 15-deg binocular scotomas than it was in response to full-field stimulation. The fusional responses to annular stimuli were similar to those elicited by scotomatic stimuli. PMID:4019095

Boman, D K; Kertesz, A E

1985-08-01

117

Investigating motors and magnetism.  

NSDL National Science Digital Library

This activity is an activity where students build a motor, learn motor operation and theory, interpret their understanding through troubleshooting, and develop a new, experimental question related to the motor. One follow-up activity would be coupling their motor to a fan blade or other axle to convert electrical energy to magnetic energy into mechanical motion for real world application.

Reierson, David

118

AC induction motor efficiency  

Microsoft Academic Search

The author discusses those factors which determine the efficiency and rating of polyphase AC induction motors. The loss mechanisms are described and are related to the performance and design characteristics of the motor, such as the operating flux density, the winding turns distribution, the current density in the windings, the motor speed torque characteristic, and the motor efficiency itself. The

S. D. Umans

1989-01-01

119

Compact piezoelectric ultrasonic motors  

Microsoft Academic Search

This paper reviews recent developments of compact ultrasonic motors using piezoelectric resonant vibrations. Following the historical background, ultrasonic motors using the standing and traveling waves are introduced. Driving principles and motor characteristics are explained in comparison with the conventional electromagnetic motors.

Kenji Uchino; Burhanettin Koc

1999-01-01

120

Compact ultrasonic rotary motors  

Microsoft Academic Search

This paper reviews recent developments of compact ultrasonic rotary motors using piezoelectric resonant vibrations. Following the historical background, three ultrasonic motors recently developed are introduced; windmill, PZT tube and metal tube types. Driving principles and motor characteristics are described in comparison with the conventional ultrasonic motors. Motors with 1.5 mm in diameter and 0.1 mNm in torque have been actually

K. Uchino; B. Koc; S. Dong

2001-01-01

121

Reconstruction of acquired oromandibular defects.  

PubMed

Acquired defects of the mandible resulting from trauma, infection, osteoradionecrosis, and ablative surgery of the oral cavity and lower face are particularly debilitating. Familiarity with mandibular and cervical anatomy is crucial in achieving mandibular reconstruction. The surgeon must evaluate which components of the hard and soft tissue are missing in selecting a method of reconstruction. Complexity of mandibular reconstruction ranges from simple rigid internal fixation to microvascular free tissue transfer, depending on defect- and patient-related factors. Modern techniques for microvascular tissue transfer provide a wide array of reconstructive options that can be tailored to patients' specific needs. PMID:23642671

Fernandes, Rui P; Yetzer, Jacob G

2013-05-01

122

Severe community-acquired pneumonia.  

PubMed

Severe community-acquired pneumonia necessitating intensive care unit admission is associated with high morbidity, mortality, and health-care cost. This review article serves to summarize the epidemiology, diagnosis, treatment, and prognosis of this common life-threatening condition. Current practice guidelines as well as the role of several scoring systems (such as the PSI, CURB-65, and IDSA/ATS criteria) used to predict CAP severity, prognosis, and site of care are reviewed. In addition, common complications and prevention strategies are discussed. PMID:23830654

Sligl, Wendy I; Marrie, Thomas J

2013-07-01

123

Experiments on Decision Fusion for Driver Recognition  

Microsoft Academic Search

\\u000a In this chapter, we study the individual as well as combined performance of various driving behavior signals on identifying\\u000a the driver of a motor vehicle. We investigate a number of classifier fusion techniques to combine multiple channel decisions.\\u000a We observe that some driving signals carry more biometrie information than others. When we employ trainable combining methods,\\u000a we can reduce identification

Hakan Erdogan; Aytül Ereil; Hüseyin Abut

124

Acquired Enamel Pellicle of Human Teeth.  

National Technical Information Service (NTIS)

The literature concerning the chemical composition and physical properties of the acquired organic integuments (pellicle) of human enamel was reviewed and the findings summarized. The source, mode of formation, and function of the acquired pellicle are di...

C. W. Mayhall

1971-01-01

125

Homopolar motors and generators. (Latest citations from the INSPEC database). Published Search  

SciTech Connect

The bibliography contains citations concerning design, analysis, construction, testing, and applications of homopolar motors and generators. Energy storage for nuclear fusion and industrial welding facilities is discussed. Applications of homopolar motors in transportation are presented. Topics also include magnetic circuit analysis, superconducting windings, and environmental testing. (Contains a minimum of 58 citations and includes a subject term index and title list.)

Not Available

1994-02-01

126

Fusion Science Education Outreach  

Microsoft Academic Search

This presentation will focus on education outreach activities at General Atomics that have been expanded to include the general population on science education with a focus on fusion energy. Outreach materials are distributed upon request both nationally and internationally. These materials include a notebook containing copies of DIII--D tour panels, fusion poster, new fusion energy video, new fusion energy brochure,

C. A. Danielson

1996-01-01

127

Bejel: acquirable only in childhood?  

PubMed

Bejel clearly has a long history in the Middle East and the Sudan, but was it transmitted to Europe? As the major manifestation of bejel is presence of periosteal reaction in 20-40% of afflicted populations, absence of significant population frequency of periosteal reaction in Europe would exclude that diagnosis. Examination of skeletal populations from continental Europe revealed no significant periosteal reaction at the time of and immediately subsequent to the Crusades. Thus, there is no evidence for bejel in Europe, in spite of clear contact (the mechanism of bejel transmission in children) between warring groups, at least during the Crusades. This supports the hypothesis that bejel is a childhood-acquired disease and apparently cannot be contracted in adulthood. PMID:17049474

Rothschild, Bruce M; Rothschild, Christine; Naples, Virginia; Billard, Michel; Panero, Barbara

2006-10-17

128

Hospital acquired acute renal failure.  

PubMed

This study was performed to evaluate hospital-acquired renal insufficiency with special reference to the causative factors, clinical course and patient management. A total of 100 patients who were admitted to medical and surgical wards at the King Hussein Medical Center, Amman, Jordan over a 15-month period and who developed renal failure during their hospital stay, were referred to, and seen at the nephrology department. The patients ages varied from 18 to 77 years; there were 59 males and 41 females. Reduced renal perfusion, major surgery and administration of nephrotoxic drugs accounted for the majority of episodes of renal failure (77%). In general, non-oliguric patients fared better, they required dialysis less frequently and had lower mortality compared to the oliguric patients. Severity of renal failure and multi-organ involvement adversely affected the prognosis. However, age of the patient had no influence on the outcome. PMID:18417766

El-Lozi, M; Akash, N; Gneimat, M; Smadi, I; Nimri, M; Hadidi, M

129

Advanced motor and motor control development  

Microsoft Academic Search

The capability of operating a high speed permanent magnet brushless dc motor with electronic controller over a wide load and speed range was demonstrated. A centrifugal pump was used as the loading mechanism and hydraulic fluid was pumped in simulation of an aircraft engine fuel pump requirement. A motor speed of 45,000 rpm was reached and a maximum output of

Kenneth L. Wuertz; Edward D. Beauchamp

1988-01-01

130

Fusion energy  

SciTech Connect

The main purpose of the International Thermonuclear Experimental Reactor (ITER) is to develop an experimental fusion reactor through the united efforts of many technologically advanced countries. The ITER terms of reference, issued jointly by the European Community, Japan, the USSR, and the United States, call for an integrated international design activity and constitute the basis of current activities. Joint work on ITER is carried out under the auspices of the International Atomic Energy Agency (IAEA), according to the terms of quadripartite agreement reached between the European Community, Japan, the USSR, and the United States. The site for joint technical work sessions is at the MaxPlanck Institute of Plasma Physics. Garching, Federal Republic of Germany. The ITER activities have two phases: a definition phase performed in 1988 and the present design phase (1989--1990). During the definition phase, a set of ITER technical characteristics and supporting research and development (R D) activities were developed and reported. The present conceptual design phase of ITER lasts until the end of 1990. The objectives of this phase are to develop the design of ITER, perform a safety and environmental analysis, develop site requirements, define future R D needs, and estimate cost, manpower, and schedule for construction and operation. A final report will be submitted at the end of 1990. This paper summarizes progress in the ITER program during the 1989 design phase.

Not Available

1990-09-01

131

Asynchronous induction roller motors  

Microsoft Academic Search

Problems of designing special modifications of roller induction motors of ARM2P type for variable-frequency electric drives\\u000a have been considered. Motor designs, energy indices, and adjustment properties are presented.

A. E. Gusel’nikov; V. S. Baklin; P. R. Baranov

2008-01-01

132

Micro Piezoelectric Ultrasonic Motors.  

National Technical Information Service (NTIS)

This paper reviews recent developments of micro ultrasonic rotary motors using piezoelectric resonant vibrations. Following the historical background, four ultrasonic motors recently developed at Penn State University are introduced: windmill, PZT tube, m...

K. Uchino S. Cagatay B. Koc S. Dong P. Bouchilloux

2003-01-01

133

A prospective comparison of nursing home acquired pneumonia with community acquired pneumonia  

Microsoft Academic Search

A prospective comparison of nursing home acquired pneumonia with community acquired pneumonia. W.S. Lim, J.T. Macfarlane. #ERS Journals Ltd 2001. ABSTRACT: Nursing home acquired pneumonia (NHAP) is thought to be clinically distinct from community acquired pneumonia (CAP). This observation, based on studies conducted mainly in North America, may not be relevant in countries with a different healthcare system. The authors

W. S. Lim; J. T. MacFarlane

2001-01-01

134

Developing Language in a Developing Body: The Relationship between Motor Development and Language Development  

ERIC Educational Resources Information Center

|During the first eighteen months of life, infants acquire and refine a whole set of new motor skills that significantly change the ways in which the body moves in and interacts with the environment. In this review article, I argue that motor acquisitions provide infants with an opportunity to practice skills relevant to language acquisition…

Iverson, Jana M.

2010-01-01

135

Detection of Induction Motor Faults: A Comparison of Stator Current, Vibration and Acoustic Methods  

Microsoft Academic Search

In this paper we present the comparison results of induction motor fault detection using stator current, vibration, and acoustic methods. A broken rotor bar fault and a combination of bearing faults (inner race, outer race, and rolling element faults) were induced into variable speed three-phase induction motors. Both healthy and faulty signatures were acquired under different speed and load conditions.

WEIDONG LI; CHRIS K. MECHEFSKE

2006-01-01

136

Implementing Motor Decision Plans  

Microsoft Academic Search

In spite of the significant savings that could be realized from improved motor decisions, most industrial facilities do not have plans in place. A number of reasons contribute to this including lack of resource to pay attention to these motors and a perception that the implementation of a plan is challenging and time consuming. In reality, motor plans can be

R. Neal Elliott; Ronald G. Wroblewski

137

Motor considerations for turbomachinery  

Microsoft Academic Search

Customers who use large rotating equipment realize motors can be subjected to hostile environmental conditions, nonstandard voltage levels and a variety of load requirements. The motor specifications they write reflect this change and have become far more detailed. Too often in the past, when large projects were being organized and highly technical equipment purchased, induction motors were thought of as

R. F. Halfpap; R. Brotherhood

1995-01-01

138

Identification of a Motor with Multiple Nonlinearities by Improved Genetic Algorithm  

Microsoft Academic Search

\\u000a This paper presents a mathematical model that employs a new genetic algorithm for motor identification. Mechanical structures\\u000a require precise motor information for high control performance. However, it is difficult to acquire accurate motor information\\u000a and a genetic algorithm can be an adequate method to search unknown parameters using only angular position. The previous methods\\u000a by using conventional genetic algorithms do

Jung-shik Kong; Jin-geol Kim

2005-01-01

139

[Severe community-acquired pneumonia].  

PubMed

There is no precise definition for severe community-acquired pneumonia (SEHP), but there are a number of factors which are associated with a greater severity, and which therefore recommended the admission of these patients in an intensive care unit (ICU). In the present article, we mainly refer to SEHP in the immune competent population. SEHP makes up 8-10% of the total number of admissions of an ICU although this depends greatly on the type of unit concerned. The majority of patients admitted, do so because they need mechanical ventilation, because they present a shock situation, or because they develop a multi-organ failure in the course of the disease. The battery of usual tests recommended basically includes a chest x-ray, arterial gas, a count of red and white blood cells, biochemical profile, blood cultures, analysis and culture of the pleural liquid (if this is present), and respiratory samples. The therapeutic strategies tend to guarantee the simultaneous coverage of S. pneumoniae, H. influenzae, and the so-called atypical pathogens. Keeping in mind the considerable percentage of penicillin resistant pneumococcus existing in our country, in a general manner it is recommended to use a combination of a macrolide with a 3rd generation cephalosporin against this organism. They should be detected early, especially those situations in which there is respiratory failure and shock which shall require the use of mechanical ventilation and inotropics as well as an adequate monitoring. PMID:9410082

Insausti, J; Olaechea, P; Barado, J

1997-10-01

140

[Treatment of community acquired pneumonia].  

PubMed

The S3 guidelines for diagnosis and therapy use German epidemiological data to set the standards for a risk and degree of severity based treatment of community acquired pneumonia (CAP). Over the last few years, a change in pathogen epidemiology has been recognized with the significance of staphylococci and enterobacteria increasing. CAP is becoming increasingly a disease of the elderly, for whom a more broadly effective initial therapy appears to be needed. Resistant pathogens play an important role in the course of the disease. For patients with a low risk of mortality, a reduction in the length of therapy seems possible. On the other hand, the early identification of critically ill patients who require treatment with high dose, broad spectrum antibiotics is necessary. Antibiotic associated diarrhoea, caused by Clostridium difficile, is a significant complication in antibiotic therapy. With the introduction of vaccination against Streptococcus pneumoniae for children, a change in the course of the illness and an improvement in the resistance situation has been achieved. An update of the S3 guidelines is intended for 2008 in order to integrate new knowledge into the recommendations. PMID:17431572

Welte, T

2007-05-01

141

Regional distribution of forest height and biomass from multisensor data fusion  

Microsoft Academic Search

Elevation data acquired from radar interferometry at C-band from SRTM are used in data fusion techniques to estimate regional scale forest height and aboveground live biomass (AGLB) over the state of Maine. Two fusion techniques have been developed to perform post-processing and parameter estimations from four data sets: 1 arc sec National Elevation Data (NED), SRTM derived elevation (30 m),

Yifan Yu; Sassan Saatchi; Linda S. Heath; Elizabeth LaPoint; Ranga Myneni; Yuri Knyazikhin

2010-01-01

142

A Reconfigurable Stepping Motor  

NASA Astrophysics Data System (ADS)

Multiphase brushless actuators, commonly known as the stepper motors, are ubiquitous for many precision control applications. Developments in the microelectronics have lead to their use as efficient drive motors for modern electric vehicles. Understanding the physics and the control logic for interfacing these transducers continues to be important for scientists and engineers. An overview of the stepping motor principles and interfacing requirements is presented and a simple working model used to teach the concepts of stepper motors is described and demonstrated. This model was used to design a much larger stepper motor required to precisely rotate a massive optical system in the undergraduate advanced physics laboratory.

Rogers, Charles; Selvaggi, Richard

2009-04-01

143

Adiabatic quantum motors.  

PubMed

When parameters are varied periodically, charge can be pumped through a mesoscopic conductor without applied bias. Here, we consider the inverse effect in which a transport current drives a periodic variation of an adiabatic degree of freedom. This provides a general operating principle for adiabatic quantum motors which we discuss here in general terms. We relate the work performed per cycle on the motor degree of freedom to characteristics of the underlying quantum pump and discuss the motors' efficiency. Quantum motors based on chaotic quantum dots operate solely due to quantum interference, and motors based on Thouless pumps have ideal efficiency. PMID:23971547

Bustos-Marún, Raúl; Refael, Gil; von Oppen, Felix

2013-08-05

144

Atomic Force Microscope Studies of the Fusion of Floating Lipid Bilayers  

Microsoft Academic Search

This study investigated the fusion of apposing floating bilayers of egg L-?-phosphatidylcholine (egg PC) or 1,2-dimyristoyl-sn-glycero-3-phosphocholine. Atomic force microscope measurements of fusion forces under different compression rates were acquired to reveal the energy landscape of the fusion process under varied lipid composition and temperature. Between compression rates of ?1000 and ?100,000 pN\\/s, applied forces in the range from ?100 to

Midhat H. Abdulreda; Vincent T. Moy

2007-01-01

145

Towards New Content Services by Fusion of Web and Broadcasting Contents  

Microsoft Academic Search

We describe the research on fusion of Web and TV broadcasting contents conducted by Kyoto University 21st COE program and NICT communication\\/broadcasting contents fusion project. Despite much talk about the fusion of broadcasting\\u000a and the Internet, no technology has been established for fusing web and TV program content. We proposed several ways to acquire\\u000a information from diverse information sources of

Katsumi Tanaka

2007-01-01

146

Dynamic Response Study of Flexible Nozzle in Solid Rocket Motor  

Microsoft Academic Search

system, solid rocket motor and control system must be examined jointly many times during the course of the flexible nozzle study. With the aim of acquiring the responses of flexible to different excitation, there is much experiment to be done. Those different excitation signals are accomplished when different forces applied to the supports in divergent section. While the deformation of

Hongbin Shi; Xiao Hou

2002-01-01

147

Implementation of an embedded induction motor test and analysis system  

Microsoft Academic Search

This article presents the implementation of an embedded induction motor test and analysis system based on ARM and Linux. This system adopts the ARM microprocessor - S3C2410X - as the core of the hardware and the Linux as the embedded operating system. It can be used to sample and acquire the currents, voltages, and the rate of the tested induction

Hongbin Gao; Yukun Liu; Liwei Guo

2011-01-01

148

Imitating chemical motors with optimal information motors.  

PubMed

To induce transport, detailed balance must be broken. A common mechanism is to bias the dynamics with a thermodynamic fuel, such as chemical energy. An intriguing, alternative strategy is for a Maxwell demon to effect the bias using feedback. We demonstrate that these two different mechanisms lead to distinct thermodynamics by contrasting a chemical motor and information motor with identical dynamics. To clarify this difference, we study both models within one unified framework, highlighting the role of the interaction between the demon and the motor. This analysis elucidates the manner in which information is incorporated into a physical system. PMID:23862988

Horowitz, Jordan M; Sagawa, Takahiro; Parrondo, Juan M R

2013-07-03

149

Rotary DNA motors.  

PubMed Central

Many molecular motors move unidirectionally along a DNA strand powered by nucleotide hydrolysis. These motors are multimeric ATPases with more than one hydrolysis site. We present here a model for how these motors generate the requisite force to process along their DNA track. This novel mechanism for force generation is based on a fluctuating electrostatic field driven by nucleotide hydrolysis. We apply the principle to explain the motion of certain DNA helicases and the portal protein, the motor that bacteriophages use to pump the genome into their capsids. The motor can reverse its direction without reversing the polarity of its electrostatic field, that is, without major structural modifications of the protein. We also show that the motor can be driven by an ion gradient; thus the mechanism may apply as well to the bacterial flagellar motor and to ATP synthase. Images FIGURE 1 FIGURE 2 FIGURE 4 FIGURE 5 FIGURE 7

Doering, C; Ermentrout, B; Oster, G

1995-01-01

150

Motorized support jack  

DOEpatents

A compact, vacuum compatible motorized jack for supporting heavy loads and adjusting their positions is provided. The motorized jack includes: (a) a housing having a base; (b) a first roller device that provides a first slidable surface and that is secured to the base; (c) a second roller device that provides a second slidable surface and that has an upper surface; (d) a wedge that is slidably positioned between the first roller device and the second roller device so that the wedge is in contact with the first slidable surface and the second slidable surface; (e) a motor; and (d) a drive mechanism that connects the motor and the wedge to cause the motor to controllably move the wedge forwards or backwards. Individual motorized jacks can support and lift of an object at an angle. Two or more motorized jacks can provide tip, tilt and vertical position adjustment capabilities.

Haney, Steven J. (Tracey, CA); Herron, Donald Joe (Manteca, CA)

2001-01-01

151

When Affordances Climb into Your Mind: Advantages of Motor Simulation in a Memory Task Performed by Novice and Expert Rock Climbers  

ERIC Educational Resources Information Center

|Does the sight of multiple climbing holds laid along a path activate a motor simulation of climbing that path? One way of testing whether multiple affordances and their displacement influence the formation of a motor simulation is to study acquired motor skills. We used a behavioral task in which expert and novice rock climbers were shown three…

Pezzulo, Giovanni; Barca, Laura; Bocconi, Alessandro Lamberti; Borghi, Anna M.

2010-01-01

152

Acquired Chiari malformation secondary to atlantoaxial vertical subluxation in a patient with rheumatoid arthritis combined with atlanto-occipital assimilation.  

PubMed

A 65-year-old woman with a history of rheumatoid arthritis presented with a rare case of acquired Chiari malformation secondary to atlantoaxial vertical subluxation, associated with congenital atlanto-occipital assimilation. Syringomyelia and tetraparesis improved immediately after posterior fossa decompression and simultaneous occipito-cervical junction fusion. The progression of acquired Chiari malformation is not well known. We concluded that coexisting assimilation accelerated crowded foramen magnum following atlantoaxial vertical subluxation and induced acquired Chiari malformation over the course of a few years. PMID:23006887

Kimura, Yuiko; Seichi, Atsushi; Gomi, Akira; Kojima, Masahiro; Inoue, Hirokazu; Kimura, Atsushi

2012-01-01

153

Extending Dynamic Range of Monochrome and Color Images through Fusion  

Microsoft Academic Search

This paper presents an approach to enhance the dynamic range of monochromatic and color images. The goal of this method is that of overcoming the inherent physical limitations of the acquisition process. The approach uses pattern-selective image fusion as a means to integrate information from images acquired under different shutter speeds or apertures. The result of this process is a

Luca Bogoni

2000-01-01

154

Cluster-impact fusion  

NASA Astrophysics Data System (ADS)

We present a model for the cluster-impact-fusion experiments of Buehler, Friedlander, and Friedman, Calculated fusion rates as a function of bombarding energy for constant cluster size agree well with experiment. The dependence of the fusion rate on cluster size at fixed bombarding energy is explained qualitatively. The role of correlated, coherent collisions in enhanced energy loss by clusters is emphasized.

Echenique, P. M.; Manson, J. R.; Ritchie, R. H.

1990-03-01

155

Maturation of Spinal Motor Neurons Derived from Human Embryonic Stem Cells  

PubMed Central

Our understanding of motor neuron biology in humans is derived mainly from investigation of human postmortem tissue and more indirectly from live animal models such as rodents. Thus generation of motor neurons from human embryonic stem cells and human induced pluripotent stem cells is an important new approach to model motor neuron function. To be useful models of human motor neuron function, cells generated in vitro should develop mature properties that are the hallmarks of motor neurons in vivo such as elaborated neuronal processes and mature electrophysiological characteristics. Here we have investigated changes in morphological and electrophysiological properties associated with maturation of neurons differentiated from human embryonic stem cells expressing GFP driven by a motor neuron specific reporter (Hb9::GFP) in culture. We observed maturation in cellular morphology seen as more complex neurite outgrowth and increased soma area over time. Electrophysiological changes included decreasing input resistance and increasing action potential firing frequency over 13 days in vitro. Furthermore, these human embryonic stem cell derived motor neurons acquired two physiological characteristics that are thought to underpin motor neuron integrated function in motor circuits; spike frequency adaptation and rebound action potential firing. These findings show that human embryonic stem cell derived motor neurons develop functional characteristics typical of spinal motor neurons in vivo and suggest that they are a relevant and useful platform for studying motor neuron development and function and for modeling motor neuron diseases.

Takazawa, Tomonori; Croft, Gist F.; Amoroso, Mackenzie W.; Studer, Lorenz; Wichterle, Hynek; MacDermott, Amy B.

2012-01-01

156

Acquiring New Speech Sounds by Clustering  

Microsoft Academic Search

Acquiring a second language phonetic contrast involves learn- ing new sound categories from examples. Consequently, re- search in category learning should have important implica- tions for research examining how a foreign sound contrast is acquired. The current project is an initial attempt to apply work in category learning to work in second language sound acquisition. Here, I advance that a

Yasuaki Sakamoto

157

Acquiring and Managing Electronic Journals. ERIC Digest.  

ERIC Educational Resources Information Center

Electronic journals are both a blessing and a curse for libraries. To be meaningful in the current information environment--to meet users' ever-increasing demands--libraries must acquire as many appropriate full text resources as possible, as quickly as possible, and make them easy to use. This Digest provides tips for acquiring and providing…

Curtis, Donnelyn; Yue, Paoshan

158

Approach to Acquiring and Applying Knowledge.  

National Technical Information Service (NTIS)

The problem addressed in this paper is how to enable a computer system to acquire facts about new domains from tutors who are experts in their respective fields, but who have little or no training in computer science. The information to be acquired is tha...

G. G. Hendrix N. Haas

1980-01-01

159

Hospital-acquired infection in elderly patients  

Microsoft Academic Search

Increasing numbers of elderly people are being treated in hospitals and are at particular risk of acquiring infections. The incidence, risk factors and types of hospital-acquired infection (HAI) in the elderly are reviewed. Special reference is made to urinary tract infections, respiratory tract infections, gastrointestinal infections including Clostridium difficile, bacteraemia, skin and soft tissue infections and infections with antibiotic-resistant organisms.

M. E. Taylor; B. A. Oppenheim

1998-01-01

160

Cost of Hospital-Acquired Infection  

Microsoft Academic Search

The authors assessed the costs of hospital-acquired infections using rigorous econometric methods on publicly available data, controlling for the interdependency of length of stay and the incidence of hospital acquired infection, and estimated the cost shares of different payers. They developed a system of equations involving length of stay, incidence of infection, and the total hospital care cost to be

Mahmud Hassan; Howard P. Tuckman; Robert H. Patrick; David S. Kountz; Jennifer L. Kohn

2010-01-01

161

A variable torque motor compatible with magnetic resonance imaging.  

PubMed

High magnetic fields used in magnetic resonance imaging (MRI) do not allow the employment of conventional motors due to various incompatibility issues. This paper reports on a new motor that can operate in or near high field magnets used for MRI. The motor was designed to be operational with the MRI equipment and could be used in a rotating imaging gantry inside the magnet designed for dual modality imaging. Furthermore, it could also be used for image guided robotic interventional procedures inside a MRI system if so desired. The prototype motor was developed using magnetic resonance (MR) compatible materials, and its functionality with MR imaging was evaluated experimentally by measuring the performance of the motor and its effect on the MR image quality. Since in our application, namely, single photon emission tomography, the motor has to perform precise stepping of the gantry in small angular steps the most important parameter is the start-up torque. The experimental results showed that the motor has a start-up torque up to 1.37 Nm and rotates at 196 rpm when a constant voltage difference of 12 V is applied at a magnetic field strength of 1 T. The MR image quality was quantified by measuring the signal-to-noise of images acquired under different conditions. The results presented here indicate that the motor is MR compatible and could be used for rotating an imaging gantry or a surgical device inside the magnet. PMID:19405704

Roeck, W W; Ha, S-H; Farmaka, S; Nalcioglu, O

2009-04-01

162

Usual and Virtual Reality Video Game-Based Physiotherapy for Children and Youth with Acquired Brain Injuries  

ERIC Educational Resources Information Center

|Little is known about how therapists promote learning of functional motor skills for children with acquired brain injuries. This study explores physiotherapists' description of these interventions in comparison to virtual reality (VR) video game-based therapy. Six physiotherapists employed at a children's rehabilitation center participated in…

Levac, Danielle; Miller, Patricia; Missiuna, Cheryl

2012-01-01

163

The Best Time to Acquire New Skills: Age-Related Differences in Implicit Sequence Learning across the Human Lifespan  

ERIC Educational Resources Information Center

Implicit skill learning underlies obtaining not only motor, but also cognitive and social skills through the life of an individual. Yet, the ontogenetic changes in humans' implicit learning abilities have not yet been characterized, and, thus, their role in acquiring new knowledge efficiently during development is unknown. We investigated such…

Janacsek, Karolina; Fiser, Jozsef; Nemeth, Dezso

2012-01-01

164

The dynein microtubule motor  

Microsoft Academic Search

Dyneins are large multi-component microtubule-based molecular motors involved in many fundamental cellular processes including vesicular transport, mitosis and ciliary\\/flagellar beating. In order to achieve useful work, these enzymes must contain motor, cargo-binding and regulatory components. The ATPase and microtubule motor domains are located within the very large dynein heavy chains that form the globular heads and stems of the complex.

Stephen M King

2000-01-01

165

Hybrid ultrasonic micromachined motors  

Microsoft Academic Search

A hybrid ultrasonic motor has been fabricated using silicon micromachining and metallic micromechanical components. The concept of elastic force motors (EFMs) is applied for the conversion of standing waves to mechanical energy. Millimeter-size prototypes (6×6×2 mm) show interesting characteristics. Free rotation speed up to 600 rpm and net torque of 50 nNm are observed. Typical applications are the motorization of

G.-A. Racine; R. Luthier; N. F. de Rooij

1993-01-01

166

Main Drives and Motors  

Microsoft Academic Search

\\u000a This chapter provides a brief discussion on variable speed motors and drives for the tandem cold rolling process. The basic\\u000a characteristics of the cage rotor induction motor and the synchronous motor are presented, along with the voltage converter\\u000a as a viable modern drive for these machines. Cycloconverters are also addressed as a less preferred drive. Material is included\\u000a which describes

John Pittner; Marwan A. Simaan

167

Electric vehicle motors and controllers  

Microsoft Academic Search

Improved and advanced components being developed include electronically commutated permanent magnet motors of both drum and disk configuration, an unconventional brush commutated motor, and ac induction motors and various controllers. Test results on developmental motors, controllers, and combinations thereof indicate that efficiencies of 90% and higher for individual components, and 80% to 90% for motor\\/controller combinations can be obtained at

R. R. Secunde

1981-01-01

168

The Basal Ganglia and Adaptive Motor Control  

NASA Astrophysics Data System (ADS)

The basal ganglia are neural structures within the motor and cognitive control circuits in the mammalian forebrain and are interconnected with the neocortex by multiple loops. Dysfunction in these parallel loops caused by damage to the striatum results in major defects in voluntary movement, exemplified in Parkinson's disease and Huntington's disease. These parallel loops have a distributed modular architecture resembling local expert architectures of computational learning models. During sensorimotor learning, such distributed networks may be coordinated by widely spaced striatal interneurons that acquire response properties on the basis of experienced reward.

Graybiel, Ann M.; Aosaki, Toshihiko; Flaherty, Alice W.; Kimura, Minoru

1994-09-01

169

Electric Vehicle Motors and Controllers.  

National Technical Information Service (NTIS)

Improved and advanced components being developed include electronically commutated permanent magnet motors of both drum and disk configuration, an unconventional brush commutated motor, and ac induction motors and various controllers. Test results on deve...

R. R. Secunde

1981-01-01

170

Stepping motor controller  

DOEpatents

A stepping motor is microprocessor controlled by digital circuitry which monitors the output of a shaft encoder adjustably secured to the stepping motor and generates a subsequent stepping pulse only after the preceding step has occurred and a fixed delay has expired. The fixed delay is variable on a real-time basis to provide for smooth and controlled deceleration.

Bourret, S.C.; Swansen, J.E.

1982-07-02

171

Piezoelectric Ultrasonic Motors  

Microsoft Academic Search

Piezoelectric ultrasonic motors are a new type of actuator. They are characterized by high torque at low rotational speed, simple mechanical design and good controllability. They also provide a high holding torque even if no power is applied. Compared to electromagnetic actuators the torque per volume ratio of piezoelectric ultrasonic motors can be higher by an order of magnitude. Recently

Jorg Wallaschek

1995-01-01

172

Stepping motor controller  

DOEpatents

A stepping motor is microprocessingly controlled by digital circuitry which monitors the output of a shaft encoder adjustably secured to the stepping motor and generates a subsequent stepping pulse only after the preceding step has occurred and a fixed delay has expired. The fixed delay is variable on a real-time basis to provide for smooth and controlled deceleration.

Bourret, Steven C. (Los Alamos, NM); Swansen, James E. (Los Alamos, NM)

1984-01-01

173

Electronic Motor Braking  

Microsoft Academic Search

Electronic motor brakes (EMB's) can be applied to both new and existing machines to provide a rapid nonmechanical adjustable braking profile. They can also be used to supplement the braking torque of existing brake motors, forming a complete sequential braking system for demanding applications. The EMB stops without friction or wear. It also provides for an adjustable soft stop and

Richard Shemanske

1983-01-01

174

Brushless DC motor selection  

Microsoft Academic Search

This paper investigates the process of brushless DC motor selection through the specification of load torque and the desired load motion as a function of time. The peak and RMS torque requirements of the application are discussed along with the procedure to find the correct motor size and performance. Gearing and power transmissions are also considered in the drive system

B. K. Fussell; C. K. Taft

1995-01-01

175

Motor carrier evaluation program  

SciTech Connect

The purpose of the Motor Carrier Evaluation Program is to develop a set of standards or guidelines that can be used to evaluate the ability of motor carriers to safely transport Highway Route Controlled Quantities (HRCQ) and Truckload (TL) quantities of radioactive and hazardous materials or wastes owned by the US Department of Energy (DOE). This program document consists of a narrative report detailing the criteria and methodology used to objectively evaluate potential motor carriers. A sample Motor Carrier Evaluation/Carrier Profile and a Motor Carrier Inspection Data Sheet are included as appendices to this report. Organizations offering hazardous materials, such as radioactive materials and hazardous chemicals or wastes for transportation, have a regulatory and ethical responsibility to select transporters that are in compliance with all applicable federal, state, and local regulations related to the transportation of these commodities. 8 refs.

Portsmouth, J.H.; Maxwell, J.E.; Boness, G.O.

1990-02-01

176

Superconducting stepper motors  

NASA Astrophysics Data System (ADS)

A commercially available stepper motor designed for a remote positioning system of cryogenic acoustic microscopes was modified for use at liquid-He temperatures. The coils of the original disk-magnet motor were rewound with a superconducting wire consisting of 0.076-mm-thick Nb-Ti alloy clad with a 0.025-mm-thick layer of copper and insulated with Formvar. The four coils (each with the resistance of 35 ohm at room temperature) were wound on plastic coil forms, and the three pole pieces were pressed into each coil form. No adhesive was used, making it easy to remove coils from the motor, and the pole pieces from the coil forms. Three motors were thus modified and have proved reliable after many cooldowns over a period of several months. The motors were operated with about 400 mA per coil.

Moulthrop, Andrew A.; Muha, Michael S.

1988-04-01

177

Clinical Trial Design in Community Acquired Pneumonia  

Center for Biologics Evaluation and Research (CBER)

Text Version... Issues in non-inferiority trials; the evidence in community-acquired pneumonia. Clin ... culture was reported…[or] with negative blood cultures ... More results from www.fda.gov/downloads/advisorycommittees/committeesmeetingmaterials

178

Hyponatremia in Community-Acquired Pneumonia  

Microsoft Academic Search

Background\\/Aim: Community-acquired pneumonia (CAP) is a frequent cause for hospitalization and may result in a number of different renal and electrolyte complications. The purpose of this study was to describe the incidence of hyponatremia in CAP and to analyze risk factors for its occurrence. Methods: Records were reviewed for all 342 subjects who participated in the Community-Acquired Pneumonia Standardized Order

Vinay Nair; Michael S. Niederman; Naveed Masani; Steven Fishbane

2007-01-01

179

Acquired limb deficiencies. 2. Perioperative management  

Microsoft Academic Search

Pandian G, Huang ME, Duffy DA. Acquired limb deficiencies. 2. Perioperative management. Arch Phys Med Rehabil 2001;82 Suppl 1:S9-16. This self-directed learning module highlights recent advances in the evaluation and management of complications arising from diabetes and peripheral vascular disease leading to amputation. It is part of the chapter on acquired limb deficiencies in the Self-Directed Physiatric Education Program for

Geetha Pandian; Mark E. Huang; Daniel A. Duffy

2001-01-01

180

Community-acquired enterococcal urinary tract infections  

Microsoft Academic Search

Enterococcal urinary tract infection (UTI) is usually hospital-acquired and affects individuals with predisposing conditions. The aim of this study was to evaluate the community-acquired enterococcal UTIs in otherwise well children. We reviewed all the 257 first UTI episodes in children hospitalized in a General Hospital during a 5-year period. Enterococcus faecalis was isolated in 13 episodes, accounting for 5.1% of

Maria Bitsori; Sofia Maraki; Maria Raissaki; Anna Bakantaki; Emmanouil Galanakis

2005-01-01

181

Acquired hemiplegia in infancy and childhood  

Microsoft Academic Search

Summary and Conclusions  Fifty cases of acquired hemiplegias in infancy and childhood have been studied. No definite cause could be found in 29 cases\\u000a but in 16 others, there was a strong possibility that tuberculosis might have played a significant role in the causation of\\u000a their hemiplegia. Appropriate investigations to exclude tuberculosis, therefore, appear rational in all cases of acquired\\u000a hemiplegias

S. N. Basu; D. Dutta

1979-01-01

182

Acquired noncompaction in Duchenne muscular dystrophy  

Microsoft Academic Search

Acquired left ventricular hypertrabeculation\\/noncompaction (LVHT) is rare and has been described in patients with mitochondriopathy, Barth syndrome, and Becker muscular dystrophy. Here we report acquired LVHT in a 28-year-old man with Duchenne muscular dystrophy who required non-invasive, positive-pressure ventilation for muscular respiratory failure since age 16 years. Transthoracic echocardiography at age 22 years revealed enlarged left atrium and ventricle and

Josef Finsterer; Claudia Stöllberger; Kurt Gaismayer; Bart Janssen

2006-01-01

183

Economic aspects of hospital acquired infection  

Microsoft Academic Search

Despite the decline in rates of hospital acquired infections (HAI) since the 1950s, the level remains high and a significant proportion of them are unavoidable. International studies show that between 5.9 and 13.5 patients in every hundred are affected by hospital acquired infections, most frequently of the urinary tract, of the lower respiratory tract and in surgical wounds. The evidence

Elizabeth Currie; ALan Maynard

1989-01-01

184

Community-acquired pneumonia in the elderly  

Microsoft Academic Search

Background: Community-acquired pneumonia (CAP) is a frequent cause of hospitalization and death among the elderly.Objective: This article reviews information on CAP among the elderly, including age-related changes, predisposing risk factors, causes, treatment strategies, and prevention.Methods: Searches of MEDLINE (January 1990-November 2009), International Pharmaceutical Abstracts (January 1990-November 2009), and Google Scholar were conducted using the terms community-acquired pneumonia, pneumonia, treatment guidelines,

Horatio B. Fung; Maricelle O. Monteagudo-Chu

2010-01-01

185

Ultrasonic motor driving method for EMI-free image in MR image-guided surgical robotic system  

Microsoft Academic Search

Electromagnetic interference (EMI) between magnetic resonance (MR) imager and surgical manipulator is a severe problem, that degrades the image quality, in MR image- guided surgical robotic systems. We propose a novel motor driving method to acquire noise-free image. Noise generation accompanied by motor actuation is permitted only during the \\

Takashi Suzuki; Hongen Liao; Etsuko Kobayashi; Ichiro Sakuma

2007-01-01

186

ISRO's solid rocket motors  

NASA Astrophysics Data System (ADS)

Solid rocket motors have been the mainstay of ISRO's sounding rockets and the first generation satellite launch vehicles. For the new launch vehicle under development also, the solid rocket motors contribute significantly to the vehicle's total propulsive power. The rocket motors in use and under development have been developed for a variety of applications and range in size from 30 mm dia employing 450 g of solid propellant—employed for providing a spin to the apogee motors—to the giant 2.8 m dia motor employing nearly 130 tonnes of solid propellant. The initial development, undertaken in 1967 was of small calibre motor of 75 mm dia using a double base charge. The development was essentially to understand the technological elements. Extruded aluminium tubes were used as a rocket motor casing. The fore and aft closures were machined from aluminium rods. The grain was a seven-pointed star with an enlargement of the port at the aft end and was charged into the chamber using a polyester resin system. The nozzle was a metallic heat sink type with graphite throat insert. The motor was ignited with a black powder charge and fired for 2.0 s. Subsequent to this, further developmental activities were undertaken using PVC plastisol based propellants. A class of sounding rockets ranging from 125 to 560 mm calibre were realized. These rocket motors employed improved designs and had delivered lsp ranging from 2060 to 2256 Ns/kg. Case bonding could not be adopted due to the higher cure temperatures of the plastisol propellants but improvements were made in the grain charging techniques and in the design of the igniters and the nozzle. Ablative nozzles based on asbestos phenolic and silica phenolic with graphite inserts were used. For the larger calibre rocket motors, the lsp could be improved by metallic additives. In the early 1970s designs were evolved for larger and more efficient motors. A series of 4 motors for the country's first satellite launch vehicle SLV-3 were developed. The first and second stages of 1 and 0.8 m dia respectively used low carbon steel casing and PBAN propellant. The first stage used segmented construction with a total propellant weight of 8600 kg. The second stage employed about 3 tonnes of the same propellant. The third and fourth stages were of GFRP construction and employed respectively 1100 and 275 kg of CTPB type propellants. Nozzle expansion ratios upto 30 were employed and delivered vacuum lsp of 2766 Ns/kg realized. The fourth stage motor was subsequently used as the apogee motor for orbit injection of India's first geosynchronous satellite—APPLE. All these motors have been flight proven a number of times. Further design improvements have been incorporated and these motors continue to be in use. Starting in 1984 design for a large booster was undertaken. This booster employs a nominal propellant weight of 125 tonne in a 2.8 m dia casing. The motor is expected to be qualified for flight test in 1989. Side by side a high performance motor housing nearly 7 tonnes of propellant in composite casing of 2 m dia and having flex nozzle control system is also under development for upper stage application. Details of the development of the motors, their leading specifications and performance are described.

Nagappa, R.; Kurup, M. R.; Muthunayagam, A. E.

187

The fusion breeder  

Microsoft Academic Search

The fusion breeder is a fusion reactor designed with special blankets to maximize the transmutation by 14 MeV neutrons of uranium-238 to plutonium or thorium to uranium-233 for use as a fuel for fission reactors. Breeding fissile fuels has not been a goal of the U.S. fusion energy program. This paper suggests it is time for a policy change to

Ralph W. Moir

1982-01-01

188

Cell fusions in mammals  

Microsoft Academic Search

Cell fusions are important to fertilization, placentation, development of skeletal muscle and bone, calcium homeostasis and\\u000a the immune defense system. Additionally, cell fusions participate in tissue repair and may be important to cancer development\\u000a and progression. A large number of factors appear to regulate cell fusions, including receptors and ligands, membrane domain\\u000a organizing proteins, proteases, signaling molecules and fusogenic proteins

Lars-Inge Larsson; Bolette Bjerregaard; Jan Fredrik Talts

2008-01-01

189

Mechanics of membrane fusion  

PubMed Central

Diverse membrane fusion reactions in biology involve close contact between two lipid bilayers, followed by the local distortion of the individual bilayers and reformation into a single, merged membrane. We consider the structures and energies of the fusion intermediates identified in experimental and theoretical work on protein-free lipid bilayers. On the basis of this analysis, we then discuss the conserved fusion-through-hemifusion pathway of merger between biological membranes and propose that the entire progression, from the close juxtaposition of membrane bilayers to the expansion of a fusion pore, is controlled by protein-generated membrane stresses.

Chernomordik, Leonid V; Kozlov, Michael M

2008-01-01

190

Critical Review of Complex Plasma (Dusty Plasma) Diagnostics and Manipulation Techniques for the Fusion Community and Others  

Microsoft Academic Search

This paper surveys the present state of the art of diagnostics and removal techniques for particles suspended in plasma. Research on ldquodusty plasmasrdquo is necessary for ITER and fusion reactors of the future. The aim is to transfer the knowledge acquired in complex (dusty) plasma research and low temperature plasma community to the broad fusion community, which is being mobilized

Beatrice Maria Annaratone; Wolfgang Jacob; CÉcile Arnas; Gregor Eugen Morfill

2009-01-01

191

Short fusion versus long fusion for degenerative lumbar scoliosis  

Microsoft Academic Search

The extent of fusion for degenerative lumbar scoliosis has not yet been determined. The purpose of this study was to compare\\u000a the results of short fusion versus long fusion for degenerative lumbar scoliosis. Fifty patients (mean age 65.5 ± 5.1 years)\\u000a undergoing decompression and fusion with pedicle screw instrumentation were evaluated. Short fusion was defined as fusion\\u000a within the deformity, not exceeding the

Kyu-Jung Cho; Se-Il Suk; Seung-Rim Park; Jin-Hyok Kim; Sung-Soo Kim; Tong-Joo Lee; Jeong-Joon Lee; Jong-Min Lee

2008-01-01

192

36 CFR 293.6 - Commercial enterprises, roads, motor vehicles, motorized equipment, motorboats, aircraft...  

Code of Federal Regulations, 2013 CFR

...Commercial enterprises, roads, motor vehicles, motorized equipment...Commercial enterprises, roads, motor vehicles, motorized equipment...temporary or permanent roads; no aircraft landing...helispots, no use of motor vehicles, motorized...

2013-07-01

193

Multifocus microscope color image fusion based on Daub(2) and Daub(4) kernels of the Daubechies wavelet family  

NASA Astrophysics Data System (ADS)

We present in this work a multifocus image fusion based on the Daubechies wavelet transform applied to multi-focus microscopy color images acquired by the bright-field reflection microscopy technique. The fusion scheme is based on the Daub(2) and Daub(4) kernels of the Daubechies family. The fusion scheme is implemented in each RGB channel. Experimental results are presented using metallic samples.

Padilla-Vivanco, Alfonso; Tellez-Arriaga, Irwing; Toxqui-Quitl, Carina; Santiago-Tepantlan, C.

2009-08-01

194

RPM of AC Motors  

NSDL National Science Digital Library

This interactive presentation, created by Terry Bartelt for the Electromechanical Digital Library, discusses the rotations per minute (RPM) of AC motors. Bartelt begins with a discussion of the magnetism that allows most of these motors to function. The author addresses such factors as the frequency of the applied voltage and also the number of stator poles located in the magnetic field. Two and four pole motors are then discussed and compared to each other. Bartelt explains each using helpful interactive flash animations. These are not only useful in explanation, but they allow the student to more fully engage with the topic. The author concludes the presentation with a brief series of questions.

Bartelt, Terry L.

2009-04-14

195

BIOCHEMISTRY: Processive Motor Movement  

NSDL National Science Digital Library

Access to the article is free, however registration and sign-in are required. Permeating throughout a eukaryotic cell is a lattice of filamentous tracks called microtubules, upon which molecular motors travel, moving cargo about. In this transport system, the molecular motor kinesin-1 carries relatively large loads (molecular complexes, membranous vesicles, and organelles), its motion powered by the energy liberated from hydrolyzing adenosine triphosphate (ATP) (1). A mechanism that controls the stepwise movement of the molecular motor along a filamentous microtubule track in the cell does not seem to require the track itself.

David D. Hackney (Carnegie Mellon University;Department of Biological Science)

2007-04-06

196

Acquired limb deficiencies. 1. Acquired limb deficiencies in children and young adults  

Microsoft Academic Search

Bryant PR, Pandian G. Acquired limb deficiencies. 1. Acquired limb deficiencies in children and young adults. Arch Phys Med Rehabil 2001;82 Suppl 1:S3-8. This self-directed learning module highlights prosthetic treatment considerations and challenges in children and young adults. It is part of the chapter on acquired limb deficiencies in the Self-Directed Physiatric Education Program for practitioners and trainees in physical

Phillip R. Bryant; Geetha Pandian

2001-01-01

197

Acquired channelopathies in nerve injury and MS.  

PubMed

Although neurophysiologic doctrine has traditionally referred to "the" voltage-gated sodium channel, it is now clear that there are at least nine genes that encode molecularly and physiologically distinct sodium channels. Mutations of sodium channel genes provide a basis for genetic channelopathies. Dysregulated expression of sodium channels due to alterations in activity of nonmutated channel genes, on the other hand, can produce acquired channelopathies. Two examples of acquired channelopathies are discussed in this article. Recent research has established that peripheral nerve injury can provoke an acquired channelopathy in spinal sensory neurons; axonal transection triggers the turning-off of some previously active sodium channel genes and the turning-on of at least one previously silent sodium channel gene, a set of molecular changes that can result in hyperexcitability of these cells. Emerging evidence also suggests that an acquired channelopathy, characterized by abnormal expression of sensory neuron specific sodium channels that can alter impulse trafficking within Purkinje cells, may contribute to the pathophysiology of MS. Subtype-specific drugs that selectively modulate various types of channels probably will soon be developed. The acquired channelopathies associated with nerve injury and MS may thus represent prototype disorders that present therapeutic opportunities. PMID:11428390

Waxman, S G

2001-06-26

198

Controlled Nuclear Fusion.  

ERIC Educational Resources Information Center

|This publication is one of a series of information booklets for the general public published by The United States Atomic Energy Commission. Among the topics discussed are: Importance of Fusion Energy; Conditions for Nuclear Fusion; Thermonuclear Reactions in Plasmas; Plasma Confinement by Magnetic Fields; Experiments With Plasmas;…

Glasstone, Samuel

199

Fusion Power Deployment  

SciTech Connect

Fusion power plants could be part of a future portfolio of non-carbon dioxide producing energy supplies such as wind, solar, biomass, advanced fission power, and fossil energy with carbon dioxide sequestration. In this paper, we discuss key issues that could impact fusion energy deployment during the last half of this century. These include geographic issues such as resource availability, scale issues, energy storage requirements, and waste issues. The resource needs and waste production associated with fusion deployment in the U.S. should not pose serious problems. One important feature of fusion power is the fact that a fusion power plant should be locatable within most local or regional electrical distribution systems. For this reason, fusion power plants should not increase the burden of long distance power transmission to our distribution system. In contrast to fusion power, regional factors could play an important role in the deployment of renewable resources such as wind, solar and biomass or fossil energy with CO2 sequestration. We examine the role of these regional factors and their implications for fusion power deployment.

J.A. Schmidt; J.M. Ogden

2002-02-06

200

Laser Driven Fusion  

Microsoft Academic Search

Laser-driven fusion, although requiring the use of an unusual source of pulsed energy, depends in its main features on well known and verified results of hydrodynamics and nuclear physics. Under optimized conditions these allow energy breakeven by the fusion process to occur under conditions which appear to be well within the range of present technology. Achieving the energy multiplication required

Keith A. Brueckner

1973-01-01

201

Mars manned fusion spaceship  

Microsoft Academic Search

Fusion Propulsion has an enormous potential for space exploration in the near future. In the twenty-first century, a usable and efficient fusion rocket will be developed and in use. Because of the great distance between other planets and Earth, efficient use of time, fuel, and payload is essential. A nuclear spaceship would provide greater fuel efficiency, less travel time, and

J. Hedrick; B. Buchholtz; P. Ward; J. Freuh; E. Jensen

1991-01-01

202

Inertial fusion reactors (review)  

Microsoft Academic Search

The current status of the work on engineering problems of inertial fusion is reviewed. The state of laboratory physics research, aspects of driver choice, and pellet designs are discussed. Particular attention is paid to the development of inertial fusion reactors and their energy applications. It is shown that lasers with output energies in the 0.5-5.0 MJ range must be acknowledged

A V Kalinin

1984-01-01

203

Experimenting with Theoretical Motor Neuroscience  

Microsoft Academic Search

Motor neuroscience is well over 100 years old, with seminal work such as G. T. Fritz and E. Hitzig's discovery of motor cortex occurring in 1870. Theoretical motor neuroscience has been ongoing for at least the last 50 years. How mature a scientific discipline is motor neuroscience? Are experimentalists and theoreticians working together productively to help the field progress? This

Robert Ajemian; Neville Hogan

2010-01-01

204

Optimal induction motor bearing selection  

Microsoft Academic Search

There is no choice in bearing selection on small motors (less than 200 HP), where only anti-friction bearings are available. Likewise, a choice does not exist on larger motors (motors in excess of 2000 HP), where various design requirements leave only the sleeve bearing (or tilting pad bearing) as a viable option. On the intermediate size motors a choice exists.

W. R. Finley; M. M. Hodowanec

2003-01-01

205

Cryogenic testing of stepper motors  

Microsoft Academic Search

Stepper motors may be used in several subsystems of the planned Shuttle Infrared Telescope Facility. Very high reliability is required in all considered applications. An investigation was, therefore, conducted to study the operational reliability of stepper motors, taking into account tests with a type of stepper motor which had previously performed well in uncooled spectrographic instruments. Two stepper motors were

S. M. Pompea; F. Bartko; J. R. Houck

1982-01-01

206

MotorWeek  

ScienceCinema

In 2008, PBS's MotorWeek, television's original automotive magazine, visited Argonne's Transportation Technology R&D Center "to learn what it really takes to make clean power sources a viable reality."

207

Dielectric fluid motors  

SciTech Connect

On the application of high electric fields to a dielectric fluid, a convective motion of the fluid is induced. By controlling the fluid motion in nonuniform dc fields, a new type of fluid motor is developed. An angular velocity of more than 15s{sup {minus}1} (150 rpm) can be achieved at a dc voltage of 5 kV for a motor with a rotor radius of 10 mm. The efficiency of energy transformation from electric to kinetic energy is about 4{percent}. Since magnetic fields and switching circuits are not required, the advantage of the fluid motor will be enhanced by size reduction. The dielectric fluid motor is attractive as a source of mechanical energy in a micromachine. {copyright} {ital 1997 American Institute of Physics.}

Otsubo, Y. [Center of Cooperative Research, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba-shi 263 (Japan); Edamura, K. [New Technology Management Co., Higashi-Shinkoiwa 2-9-1-306, Katsushika-ku, Tokyo 124 (Japan)

1997-07-01

208

Motor Neuron Diseases  

MedlinePLUS

... speaking, walking, breathing, and swallowing. Normally, messages from nerve cells in the brain (called upper motor neurons) are transmitted to nerve cells in the brain stem and spinal cord (called ...

209

Motor Neuron Diseases  

MedlinePLUS

... speaking, walking, breathing, and swallowing. Normally, messages from nerve cells in the brain (called upper motor neurons ) are transmitted to nerve cells in the brain stem and spinal cord (called ...

210

Stepper Motors Tutorials  

NSDL National Science Digital Library

This resource presents tutorials about stepper motors. Topics include unipolar, bipolar, current control, and micro stepping. Clicking on each topic provides an in-depth tutorial complete with graphics.

2013-07-18

211

Magnetostriction and Motor Vibration  

NASA Astrophysics Data System (ADS)

These days, a quiet induction motor is strongly demanded. Electromagnetic factor is main cause of vibration and acoustic noise of small induction motor. Electromagnetic forces and magnetostrictive forces are considered of origin of electromagnetic vibration and noise. In this paper, magnetostrictive vibration of ring of electrical steel sheets was simulated by mechanical Finite Element Method. Magnetostriction was assumed as external forces and they were added at each node of meshed ring. Resonant frequency and mode of ring were calculated. In steel sheet ring excited by PWM voltage source inverter, frequency spectrum of vibration of ring was measured and compared with calculated results. It was confirmed that these procedure simulated magnetostriction behavior of electrical steel sheets. Furthermore, electromagnetic forces of small induction motor was calculated and compared with magnetostriction data. It became clear that electromagnetic vibration was affected by the magnetostriction of steel. These results will be useful to reduce the acoustic noise and to develop quiet motors.

Ishibashi, Fuminori; Noda, Shinichi; Yanase, Shunji; Sasaki, Tadashi

212

General Motors Goes Metric  

ERIC Educational Resources Information Center

Describes the program to convert to the metric system all of General Motors Corporation products. Steps include establishing policy regarding employee-owned tools, setting up training plans, and making arrangements with suppliers. (MF)

Webb, Ted

1976-01-01

213

Advanced motor and motor control development  

NASA Astrophysics Data System (ADS)

The capability of operating a high speed permanent magnet brushless dc motor with electronic controller over a wide load and speed range was demonstrated. A centrifugal pump was used as the loading mechanism and hydraulic fluid was pumped in simulation of an aircraft engine fuel pump requirement. A motor speed of 45,000 rpm was reached and a maximum output of 68.5 hp was demonstrated. The response of the system to step commands for speed change was established. Reduction of size and weight of electronic control was established as a primary future goal. The program system concept with minor rotating machine improvements is viable for high speed drive applications up to 100-hp level.

Wuertz, Kenneth L.; Beauchamp, Edward D.

1988-08-01

214

Decomposition of incomplete fusion  

SciTech Connect

The velocity distribution of fusion-like products formed in the reaction 701 MeV /sup 28/Si+/sup 100/Mo is decomposed into 26 incomplete fusion channels. The momentum deficit of the residue per nonevaporative mass unit is approximately equal to the beam momentum per nucleon. The yields of the incomplete fusion channels correlate with the Q-value for projectile fragmentation rather than that for incomplete fusion. The backward angle multiplicities of light particles and heavy ions increase with momentum transfer, however, the heavy ion multiplicities also depend on the extent of the fragmentation of the incomplete fusion channel. These data indicate that at fixed linear momentum transfer, increased fragmentation of the unfused component is related to a reduced transferred angular momentum. 22 refs., 6 figs., 1 tab.

Sobotka, L.B.; Sarantities, D.G.; Stracener, D.W.; Majka, Z.; Abenante, V.; Semkow, T.M.; Hensley, D.C.; Beene, J.R.; Halbert, M.L.

1989-01-01

215

Migraine and genetic and acquired vasculopathies.  

PubMed

It is remarkable that migraine is a prominent part of the phenotype of several genetic vasculopathies, including cerebral autosomal dominant arteriopathy with subcortical infarcts and leucoencephalopathy (CADASIL), retinal vasculopathy with cerebral leukodystrophy (RVCL) and hereditary infantile hemiparessis, retinal arteriolar tortuosity and leukoencephalopahty (HIHRATL). The mechanisms by which these genetic vasculopathies give rise to migraine are still unclear. Common genetic susceptibility, increased susceptibility to cortical spreading depression (CSD) and vascular endothelial dysfunction are among the possible explanations. The relation between migraine and acquired vasculopathies such as ischaemic stroke and coronary heart disease has long been established, further supporting a role of the (cerebral) blood vessels in migraine. This review focuses on genetic and acquired vasculopathies associated with migraine. We speculate how genetic and acquired vascular mechanisms might be involved in migraine. PMID:19689610

Stam, A H; Haan, J; van den Maagdenberg, A M J M; Ferrari, M D; Terwindt, G M

2009-09-01

216

Magnetic resonance imaging of acquired cardiac disease.  

PubMed Central

Over the last 15 years, advances in magnetic resonance imaging techniques have increased the accuracy and applicability of cardiovascular magnetic resonance imaging. These advances have improved the utility of magnetic resonance imaging in evaluating cardiac morphology, blood flow, and myocardial contractility, all significant diagnostic features in the evaluation of the patient with acquired heart disease. Utilization of cardiovascular magnetic resonance imaging has been limited, primarily due to clinical reliance upon nuclear scintigraphy and echocardiography. Recent developments in fast and ultrafast imaging should continue to enhance the significance of magnetic resonance imaging in this field. Widespread use of magnetic resonance imaging in the evaluation of the cardiovascular system will ultimately depend upon its maturation into a comprehensive, noninvasive imaging technique for the varying manifestations of acquired heart disease, including cardiomyopathy, ischemic heart disease, and acquired valvular disease. Images

Carrol, C L; Higgins, C B; Caputo, G R

1996-01-01

217

Acquired FXIII inhibitors: a systematic review.  

PubMed

Coagulation factor XIII (FXIII) is a protein that promotes fibrin stabilization by forming multiple covalent cross-links between fibrin monomers. Beside congenital FXIII deficiency, due to FXIII gene mutations, severe acquired FXIII deficiency has been described in association with autoantibodies against coagulation FXIII. These inhibitors, which occurs very rarely but may cause life-threatening bleeding complications, may arise spontaneously or in association with autoimmune and lymphoproliferative disorders or medications. The management of patients with acquired FXIII inhibitors is very demanding and treatment regimens must be focused on eradication of the inhibitor and to increase the plasma FXIII levels. In this systematic review, we analyse all the published case-reports on anti-FXIII autoantibodies focusing on the clinical features and treatment modalities of this acquired hemorrhagic condition. PMID:23065324

Franchini, Massimo; Frattini, Francesco; Crestani, Silvia; Bonfanti, Carlo

2013-07-01

218

Community-acquired pneumonia in elderly patients  

PubMed Central

Community-acquired pneumonia continues to have a significant impact on elderly individuals, who are affected more frequently and with more severe consequences than younger populations. As the population ages it is expected that the medical and economic impact of this disease will increase. Despite these concerns, little progress has been made in research specifically focusing on community-acquired pneumonia in the elderly. Data continue to show that a high index of suspicion, early antimicrobial therapy and appropriate medications to cover typical pathogens are extremely important in treating community-acquired pneumonia in older individuals. This review is designed to serve as an update to our previous work published in Aging Health in 2006, with specific emphasis on the most recent evidence published since that time.

Stupka, John E; Mortensen, Eric M; Anzueto, Antonio; Restrepo, Marcos I

2010-01-01

219

Cryogenic testing of stepper motors  

NASA Astrophysics Data System (ADS)

Stepper motors may be used in several subsystems of the planned Shuttle Infrared Telescope Facility. Very high reliability is required in all considered applications. An investigation was, therefore, conducted to study the operational reliability of stepper motors, taking into account tests with a type of stepper motor which had previously performed well in uncooled spectrographic instruments. Two stepper motors were tested, in vacuum, at liquid nitrogen temperature. One motor was lubricated with a vacuum stable grease, while the other used unlubricated bearings. Both motors failed after less than 18,000 revolutions. The failure of the unlubricated motor indicated that motor modifications would have to be made to achieve operation at liquid helium temperature. The motor was modified to compensate for the magnitude of different thermal contractions. It was then found that modified stepper motors can perform reliably at LHe temperature for extended periods.

Pompea, S. M.; Bartko, F.; Houck, J. R.

1982-10-01

220

Pennzoil to acquire part of Chevron's production  

SciTech Connect

This paper reports that Pennzoil Co., Houston, will exchange 48% of its $2.2 billion investment in Chevron Corp. for a chunk of chevron's U.S. producing leases. The trade is to involve a tax free exchange of 15.75 million chevron Corp. shares held by Pennzoil for all the stock of Chevron PBC Inc., a Chevron unit owning Gulf of Mexico, Gulf Coast, Permian basin, and other U.S. oil and gas producing leases. Sixty percent of the acquired reserves are in the Gulf of Mexico and Gulf Coast where Pennzoil's operations are concentrated, and 60% of the acquired reserves consist of natural gas, mirroring Pennzoil's reserve ratios.

Not Available

1992-10-05

221

[Critical pathway for community-acquired pneumonia].  

PubMed

A clinical pathway is a methodological tool for standardizing medical practice, improving the quality and efficiency of care delivery, and enhancing the diffusion of evidence-based medicine. Despite the fact that a majority of trials have shown that the use of clinical pathways improves certain specific outcomes such as length of stay or complications, the overall impact of these pathways in the clinical setting has yet to be documented. In the setting of community-acquired pneumonia, a few observational and one large randomized trial have shown positive effects on various outcomes. We describe in this article the clinical pathway for community-acquired pneumonia developed at our institution. PMID:21674896

Garin, N; Harbarth, S; Nendaz, M; Rochat, T; Rutschmann, O

2011-04-27

222

Sensing with the Motor Cortex  

PubMed Central

The primary motor cortex is a critical node in the network of brain regions responsible for voluntary motor behavior. It has been less appreciated, however, that the motor cortex exhibits sensory responses in a variety of modalities including vision and somatosensation. We review current work that emphasizes the heterogeneity in sensori-motor responses in the motor cortex and focus on its implications for cortical control of movement as well as for brain-machine interface development.

Hatsopoulos, Nicholas G.; Suminski, Aaron J.

2011-01-01

223

Battery powered electric motor vehicle  

SciTech Connect

The battery energized electric motor vehicle has a main driving motor connected to the battery via a footpedal operated control circuit; an auxiliary electric motor for a steering device is connected to the battery in series with the main driving motor and across the control circuit of the latter so that a difference voltage between the battery voltage and the instant driving voltage applied to the main driving motor controls the steering device.

Olbrich, G.; Pfeffer, P.

1982-09-21

224

Multiple propellant solid rocket motor  

Microsoft Academic Search

An integrated stage solid propellant rocket motor arrangement provides boost and repeated throttling post-boost operations on demand and includes an attitude control system. The rocket motor includes a plurality of casings for enclosing an initial boost motor, a post-boost motor, and gas generator means for producing gases that are used for reignition of the post-boost motor and as a motive

Allan J. McDonald

1994-01-01

225

Technology Acquisition and Performance in International Acquisitions: The Role of Compatibility Between Acquiring and Acquired Firms  

Microsoft Academic Search

This article examines the determinants of technology acquisition and performance in a sample of South Korean international acquisitions (IAs). Derived from the concept of absorptive capacity, determinants are identified as compatibility between acquiring and acquired firms, specifically organizational cultural compatibility, goal similarity, and business relatedness. The findings support the study's hypothesis that goal similarity and business relatedness positively influence technology

Byung Il Park; Keith W. Glaister; Kum-Sik Oh

2009-01-01

226

EDITORIAL: The Nuclear Fusion Award The Nuclear Fusion Award  

Microsoft Academic Search

The Nuclear Fusion Award ceremony for 2009 and 2010 award winners was held during the 23rd IAEA Fusion Energy Conference in Daejeon. This time, both 2009 and 2010 award winners were celebrated by the IAEA and the participants of the 23rd IAEA Fusion Energy Conference. The Nuclear Fusion Award is a paper prize to acknowledge the best distinguished paper among

M. Kikuchi

2011-01-01

227

Community-acquired pneumonia in children  

Microsoft Academic Search

regimens. Summary The continued evolution of bacterial resistance highlights the need for appropriate use of antibacterials. Improved diagnostic techniques will aid the treatment of children with community-acquired pneumonia. Aggressive vaccination with the pneumococcal conjugate vaccine and other available vaccines as well as the development of new vaccines will aid the prevention of respiratory disease in children.

Constantine A. Sinaniotis; Athanassios C. Sinaniotis

2005-01-01

228

How Did Light Acquire a Velocity?  

ERIC Educational Resources Information Center

|We discuss how light acquired a velocity through history, from the ancient Greeks to the early modern era. Combining abstract debates, models of light, practical needs, planned research and chance, this history illustrates several key points that should be brought out in science education.|

Lauginie, Pierre

2013-01-01

229

Acné ‘en Plaque’ and Acquired Ichthyosis  

Microsoft Academic Search

A 50-year-old man with no past history of acne vulgaris developed at the age of 47 years acneiform lesions focally distributed on the trunk, acquired ichthyosis and lichenoid lesions without history of toxic exposure. This may represent either an unnoticed exposure to a toxic substance or a paraneoplastic syndrome.Copyright © 1988 S. Karger AG, Basel

Denis Salomon; Monika Harms; Jean-Hilaire Saurat

1988-01-01

230

The clinical significance of acquired jejunoileal diverticula  

Microsoft Academic Search

Objective: Because of the relative rarity of acquired jejunoileal diverticulosis, including its symptomatology and complications, diagnosis is often difficult and delayed, resulting in unnecessary morbidity and mortality. The purpose of the present study was to draw attention to jejunoileal diverticula and their complications as a site of gastrointestinal symptoms. Methods: The records of 10 patients with symptomatic jejunoileal diverticula treated

E de Bree; J Grammatikakis; M Christodoulakis; D Tsiftsis

1998-01-01

231

Prevention of laboratory-acquired brucellosis.  

PubMed

Brucellosis is one of the most common laboratory-acquired infections, mostly because aerosolization is a mechanism of transmission in this setting. We report an exposure to Brucella melitensis that occurred in a large microbiology laboratory and describe the strategy chosen for antibiotic prophylaxis and serological follow-up of exposed workers. PMID:15227634

Robichaud, Sophie; Libman, Michael; Behr, Marcel; Rubin, Earl

2004-05-24

232

Acquired immune deficiency syndrome in childhood  

Microsoft Academic Search

Central nervous system (CNS) involvement is very frequently observed in pediatric AIDS. Clinical manifestations include encephalopathy, cognitive deficits, acquired microcephaly, neurological signs, myelopathy, and peripheral neuropathy. Neurological complications can be related to opportunistic viral infections such as encephalitis, atypical aseptic meningitis, progressive multifocal leukoencephalopathy, and myelitis. Nonviral syndromes include: toxoplasmosis, cryptococcal meningitis, candidiasis, Mycobacterium tuberculosis meningitis, and Mycobacterium avium subacute

Paola Iannetti; Paola Falconieri; Carlo Imperato

1989-01-01

233

Eye movement correlates of acquired central dyslexia  

Microsoft Academic Search

Based on recent progress in theory and measurement techniques, the analysis of eye movements has become one of the major methodological tools in experimental reading research. Our work uses this approach to advance the understanding of impaired information processing in acquired central dyslexia of stroke patients with aphasia. Up to now there has been no research attempting to analyze both

Kerstin I. Schattka; Ralph Radach; Walter Huber

2010-01-01

234

Eye Movement Correlates of Acquired Central Dyslexia  

ERIC Educational Resources Information Center

Based on recent progress in theory and measurement techniques, the analysis of eye movements has become one of the major methodological tools in experimental reading research. Our work uses this approach to advance the understanding of impaired information processing in acquired central dyslexia of stroke patients with aphasia. Up to now there has…

Schattka, Kerstin I.; Radach, Ralph; Huber, Walter

2010-01-01

235

Acquired limb deficiencies. 2. Perioperative management  

Microsoft Academic Search

This self-directed learning module highlights recent advances in the evaluation and management of complications arising from diabetes and peripheral vascular disease leading to amputation. It is part of the chapter on acquired limb deficiencies in the Self-Directed Physiatrie Education Program for practitioners and trainees in physical medicine and rehabilitation. This article includes discussion of comorbid conditions that may have an

Geetha Pandian; Mark E. Huang; Daniel A. Duffy

2001-01-01

236

Neural Correlates of Acquired Color Category Effects  

ERIC Educational Resources Information Center

|Category training can induce category effects, whereby color discrimination of stimuli spanning a newly learned category boundary is enhanced relative to equivalently spaced stimuli from within the newly learned category (e.g., categorical perception). However, the underlying mechanisms of these acquired category effects are not fully understood.…

Clifford, Alexandra; Franklin, Anna; Holmes, Amanda; Drivonikou, Vicky G.; Ozgen, Emre; Davies, Ian R. L.

2012-01-01

237

Neural Correlates of Acquired Color Category Effects  

ERIC Educational Resources Information Center

Category training can induce category effects, whereby color discrimination of stimuli spanning a newly learned category boundary is enhanced relative to equivalently spaced stimuli from within the newly learned category (e.g., categorical perception). However, the underlying mechanisms of these acquired category effects are not fully understood.…

Clifford, Alexandra; Franklin, Anna; Holmes, Amanda; Drivonikou, Vicky G.; Ozgen, Emre; Davies, Ian R. L.

2012-01-01

238

An Acquired Deficit of Audiovisual Speech Processing  

ERIC Educational Resources Information Center

We report a 53-year-old patient (AWF) who has an acquired deficit of audiovisual speech integration, characterized by a perceived temporal mismatch between speech sounds and the sight of moving lips. AWF was less accurate on an auditory digit span task with vision of a speaker's face as compared to a condition in which no visual information from…

Hamilton, Roy H.; Shenton, Jeffrey T.; Coslett, H. Branch

2006-01-01

239

Surgery-associated acquired hemophilia A  

Microsoft Academic Search

We present two patients who acquired factor VIII antibodies in the immediate postoperative period. One patient was receiving warfarin that was temporarily discontinued but reintroduced after the procedure. Preoperatively, none gave a history of bleeding, even with past surgeries, and both had normal coagulation tests. Within days of surgery, hemorrhage with prolonged activated partial thromboplastin time, low factor VIII levels,

G. Theodossiades; V. Tsevrenis; E. Nomikou; L. Dadiotis; I. Kontopoulou-Griva

2001-01-01

240

Infections acquired in clinical laboratories in Utah.  

PubMed

We reviewed laboratory-acquired infections occurring in Utah from 1978 through 1982. Written and telephone interviews of supervisors of 1,191 laboratorians revealed an estimated annual incidence of 3 laboratory-acquired infections per 1,000 employees. Infections, in order of frequency, included hepatitis B (clinical cases), shigellosis, pharyngitis, cellulitis, tuberculosis (skin test conversion), conjunctivitis, and non-A, non-B hepatitis. One-half of large laboratories (over 25 employees), but only 12% of smaller laboratories, reported infections. The annual incidence, however, at smaller laboratories was more than three times greater than at large laboratories (5.0 versus 1.5 per 1,000; P less than 0.05, chi-square test). Microbiologists were at greatest risk of infection, with an incidence of almost 1%, followed by generalists and phlebotomists. Shigellosis was acquired only by microbiologists and accounted for more than half of their infections. The most common laboratory-acquired infection, hepatitis B, affected a microbiologist, a hematologist, a phlebotomist, a pulmonary blood gas technician, and a blood bank technologist who died from her illness. Clinical cases of hepatitis B occurred at a rate 10 times higher than the rate in the general U.S. population. The incidence of tuberculosis skin test conversion was intermediate between rates reported for hospital employees and for the state of Utah. PMID:3157700

Jacobson, J T; Orlob, R B; Clayton, J L

1985-04-01

241

Support Network Responses to Acquired Brain Injury  

ERIC Educational Resources Information Center

|Acquired brain injury (ABI) affects social relationships; however, the ways social and support networks change and evolve as a result of brain injury is not well understood. This study explored ways in which survivors of ABI and members of their support networks perceive relationship changes as recovery extends into the long-term stage. Two…

Chleboun, Steffany; Hux, Karen

2011-01-01

242

Group Treatment in Acquired Brain Injury Rehabilitation  

ERIC Educational Resources Information Center

|The current article describes critical issues in adapting traditional group-treatment methods for working with individuals with reduced cognitive capacity secondary to acquired brain injury. Using the classification system based on functional ability developed at the NYU Rusk Institute of Rehabilitation Medicine (RIRM), we delineate the cognitive…

Bertisch, Hilary; Rath, Joseph F.; Langenbahn, Donna M.; Sherr, Rose Lynn; Diller, Leonard

2011-01-01

243

Interviewing Children with Acquired Brain Injury (ABI)  

ERIC Educational Resources Information Center

|Research into the lives of children with acquired brain injury (ABI) often neglects to incorporate children as participants, preferring to obtain the opinions of the adult carer (e.g. McKinlay et al., 2002). There has been a concerted attempt to move away from this position by those working in children's research with current etiquette…

Boylan, Anne-Marie; Linden, Mark; Alderdice, Fiona

2009-01-01

244

Estimating the costs of Hospital Acquired Infection  

Microsoft Academic Search

Hospital acquired infections (HAI) are a largely avoidable and costly burden on public health systems. Accurate estimates of the costs of HAI are necessary to gauge the cost efficiency of alternative infection control measures, but are traditionally very difficult to compute. In particular, existing studies of the costs of HAI do not take into account the possible endogeneity bias between

Nicholas Graves; Diana Weinhold

245

Brucella abortus Infection Acquired in Microbiology Laboratories  

Microsoft Academic Search

We report an outbreak of laboratory-acquired Brucella abortus infection originating in the accidental breakage of a centrifuge tube. A total of 12 laboratory workers were infected (attack rate of 31%), with an incubation time ranging from 6 weeks to 5 months. Antibody titers were evaluated weekly in all personnel exposed, allowing the diagnosis of the infection in most cases before

PIER LUIGI FIORI; SCILLA MASTRANDREA; PAOLA RAPPELLI; PIERO CAPPUCCINELLI

2006-01-01

246

Clinical Outcome and Fusion Rates after the First 30 Extreme Lateral Interbody Fusions  

PubMed Central

Introduction. The lateral transpsoas approach for lumbar interbody fusion (XLIF) is gaining popularity. Studies examining a surgeon's early experience are rare. We aim to report treatment, complication, clinical, and radiographic outcomes in an early series of patients. Methods. Prospective data from the first thirty patients treated with XLIF by a single surgeon was reviewed. Outcome measures included pain, disability, and quality of life assessment. Radiographic assessment of fusion was performed by computed tomography. Results. Average follow-up was 11.5 months, operative time was 60 minutes per level and blood loss was 50?mL. Complications were observed: clinical subsidence, cage breakage upon insertion, new postoperative motor deficit and bowel injury. Approach side-effects were radiographic subsidence and anterior thigh sensory changes. Two patients required reoperation; microforaminotomy and pedicle screw fixation respectively. VAS back and leg pain decreased 63% and 56%, respectively. ODI improved 41.2% with 51.3% and 8.1% improvements in PCS and MCS. Complete fusion (last follow-up) was observed in 85%. Conclusion. The XLIF approach provides superior treatment, clinical outcomes and fusion rates compared to conventional surgical approaches with lowered complication rates. Mentor supervision for early cases and strict adherence to the surgical technique including neuromonitoring is essential.

Malham, Gregory M.; Ellis, Ngaire J.; Parker, Rhiannon M.; Seex, Kevin A.

2012-01-01

247

A versatile stepping motor controller for systems with many motors  

SciTech Connect

A versatile system for controlling beamlines or complex experimental setups is described. The system as currently configured can control up to 32 motors, with all motors capable of full speed operation concurrently. There are 2 limit switch inputs for each motor, and a further input to accept a reference position marker. The motors can be controlled via a front panel keyboard with display, or by a host computer over an IEEE-488 interface. Both methods can be used together if required. There is an emergency stop'' key on the front panel keyboard to stop the motion of all motors without losing track of the motors' position. 3 refs., 4 figs., 1 tab.

Feng, S.K.; Siddons, D.P.

1989-01-01

248

Utilizing ZFS for the Storage of Acquired Data  

SciTech Connect

Every day, the amount of data that is acquired from plasma experiments grows dramatically. It has become difficult for systems administrators to keep up with the growing demand for hard drive storage space. In the past, project storage has been supplied using UNIX filesystem (ufs) partitions. In order to increase the size of the disks using this system, users were required to discontinue use of the disk, so the existing data could be transferred to a disk of larger capacity or begin use of a completely new and separate disk, thus creating a segmentation of data storage. With the application of ZFS pools, the data capacity woes are over. ZFS provides simple administration that eliminates the need to unmount to resize, or transfer data to a larger disk. With a storage limit of 16 Exabytes (1018), ZFS provides immense scalability. Utilizing ZFS as the new project disk file system, users and administrators can eliminate time wasted waiting for data to transfer from one hard drive to another, and also enables more efficient use of disk space, as system administrators need only allocate what is presently required. This paper will discuss the application and benefits of using ZFS as an alternative to traditional data access and storage in the fusion environment.

C. Pugh, P. Henderson, K. Silber, T. Carroll, K. Ying

2009-02-04

249

Inheritance of acquired traits in plants  

PubMed Central

Since Lamarck proposed the idea of inheritance of acquired traits 200 years ago, much has been said for and against it, but the theory was finally declined after the 1930s. Despite of the negative opinions of the majority of geneticists, botanists and plant breeders have long recognized that altered properties during the growth were occasionally transmitted to the offspring. This was also the case with artificially altered properties such as dwarfism, flowering timing and plant stature, which were induced by a non-mutagenic chemical, 5-azacytidine and its derivatives. As these drugs are powerful inhibitors of DNA methylation in vivo, a close correlation between methylation and phenotypic expression was suggested. Subsequent studies showed that rice plants acquired disease resistance upon demethylation of the corresponding resistant gene, and that both resistant trait and hypomethylated status were inherited by the progeny up to nine generations. Whether or not the methylation pattern changes under natural condition was then questioned, and recent studies have indicated that it indeed naturally changes in response to environmental stresses. Whether or not the altered methylation pattern during the vegetative growth is heritable was also questioned, and studies on toadflax and rice affirmed the question, showing stable maintenance of hypermethylation in the former and hypomethylation in the latter for 250 and 10 years, respectively. The observation strongly suggested that acquired traits can be heritable as far as the acquired methylation pattern is stably transmitted. This concept is consistent with the Lamarck's theory of the inheritance of acquired traits, which therefore should be carefully reevaluated to reestablish his impaired reputation.

2010-01-01

250

Dynamics of Neuronal, Autonomic, and Motor Measures in Animals Performing an Acquired Habit  

Microsoft Academic Search

Previously obtained results and data from other groups showing that intersignal activity in animals correlates with the success of acquisition of defensive and food-procuring behavior are presented. In addition, specific changes in neuron activity and in the dynamics of cardiac and respiratory activity are demonstrated during performance of intersignal behavioral acts. The moments of appearance of intersignal activity were studied,

B. V. Zhuravlev; E. P. Murtazina

2003-01-01

251

The parameter preferences of acquired motor programs for rapid, discrete movements: I. Transfer of training  

Microsoft Academic Search

Sixty subjects made discrete movements to visual targets without concurrent visual feedback. After 160 acquisition trials\\u000a with a single target\\/movement, subjects were divided into five groups for transfer. The major independent variable was the\\u000a relationship between the acquisition and transfer movements. For three groups, extent, duration, or velocity was the same\\u000a in acquisition and in transfer, with the other two

Raymond Klein; Steve Levy; John McCabe

1984-01-01

252

Fusion–fission–fusion fast ignition plasma focus  

Microsoft Academic Search

A crucial advancement in the problem for the controlled release of energy by nuclear fusion appears possible by an autocatalytic fusion–fission–fusion microexplosion, where the deuterium–tritium (DT) fusion reaction of a dense magnetized DT plasma placed inside a thin liner made up of U238, Th232 (perhaps B10) releases a sufficient number of 14 MeV fusion neutrons which by fission reactions in

F. Winterberg

2005-01-01

253

Inertial fusion commercial power plants  

SciTech Connect

This presentation discusses the motivation for inertial fusion energy, a brief synopsis of five recently-completed inertial fusion power plant designs, some general conclusions drawn from these studies, and an example of an IFE hydrogen synfuel plant to suggest that future fusion studies consider broadening fusion use to low-emission fuels production as well as electricity.

Logan, B.G. [Lawrence Livermore National Lab., CA (United States)

1994-09-01

254

Vehicles detection using sensor fusion  

Microsoft Academic Search

Sensor fusion method is more robust than the method using a single sensor, so sensor fusion is effective for vehicle recognition in a complex scene. However, if each sensing data is processed individually for most of the stages, recognition performance is not always good. In this paper, we propose the extensible and generalized fusion method. First, fusion vector which is

Hiroomi Takizawa; Kenichi Yamada; T. Ito

2004-01-01

255

Fusion of String-Matched Templates for Continuous Activity Recognition  

Microsoft Academic Search

This paper describes a new method for continuous activity recognition based on fusion of string-matched activity templates. The underlying segmentation and spotting approach is carried out on several symbol streams in parallel. These streams represent motion trajectories of body limbs in Cartesian space, acquired from body-worn inertial sensors. First results of our method in a highly complex real-world application are

Thomas Stiefmeier; Daniel Roggen; Gerhard Troster

2007-01-01

256

Laser-Driven Fusion.  

ERIC Educational Resources Information Center

|Discusses the present status and future prospects of laser-driven fusion. Current research (which is classified under three main headings: laser-matter interaction processes, compression, and laser development) is also presented. (HM)|

Gibson, A. F.

1980-01-01

257

Fusion Ignition Research Experiment  

NSDL National Science Digital Library

This site contains extensive status reports regarding background information and reviews of international fusion research and policy. Focus is on two projects, FIRE and ITER, with reports on physics and engineering design considerations, and an engineering appendix.

Laboratory, Princeton P.

2003-10-10

258

Indian fusion test reactor  

NASA Astrophysics Data System (ADS)

The fusion reactor as a volumetric neutron source can serve many applications needed for realizing fusion power reactor. For the Indian energy scenario, such a device can also produce fissile fuel for accelerating the nuclear power production. The Indian Fusion Test Reactor (FTR) is a low fusion gain (Q = 3-5) device to be used as component test facility for qualifying future reactor materials as well as for demonstrating the production of fissile fuel. FTR will be a medium sized tokamak device with a neutron wall load of 0.2 MW/m2. The presently available structural materials can be used for this device and such a device can be realized in ten years time from now. This device should produce about 25-50 kg of fissile fuel in one full-power-year and also produce the tritium needed for its operation. This device will greatly help the nuclear fission power program by producing fissile fuel.

Srinivasan, R.; FTR Team

2012-06-01

259

Ceramics for Fusion Devices.  

National Technical Information Service (NTIS)

Ceramics are required for a number of applications in fusion devices, among the most critical of which are magnetic coil insulators, windows for RF heating systems, and structural uses. Radiation effects dominate consideration of candidate materials, alth...

F. W. Clinard

1984-01-01

260

Progress toward fusion energy  

SciTech Connect

This paper summarizes the basis for the present optimism in the magnetic fusion program, and describes some of the remaining tasks leading to a demonstration power reactor and the primary technologies necessary for that endeavor.

Thomassen, K.I.

1981-03-11

261

Infrared-visual image sequence fusion algorithm with noise suppression  

NASA Astrophysics Data System (ADS)

Video sequence fusion has a high request on real-time. A new fusion method of infrared and visible video fusion is proposed, which has the characteristics of low computational complexity and noise suppression. Firstly the improved mixed frame difference method is used to achieve the separation of the infrared target areas and the background areas. Secondly the new fusion algorithm is proposed to fuse the target areas of the infrared and visible light sequence. By image smoothness operator , the source images are divided into two parts: the edge region and the smooth region. Different fusion strategies are adopted for the different regions, can highlight the image edges and texture details more accurately and remove redundant, as well as suppressing noise. Finally, the fused target areas are combined with the background area of the visible light sequence to form the final fused image, which can avoid the high background noise of infrared sequence. The experimental results show that the proposed method not only can suppress noise effectively ,but also can acquire good fusion effects as well as achieve the real time need.

Wang, Xin; Liu, Fu; Wei, Youli; Zhou, Huantian

2013-09-01

262

Cell fusion promotes chemoresistance in metastatic colon carcinoma.  

PubMed

Chemoresistance is an important concern in the treatment of metastatic colon cancer. It may emerge through selection of clones that are inherently resistant from the outset or through mechanisms acquired during treatment. Cell fusion represents an efficient means of rapid phenotypic evolution that make cells with new properties at a rate exceeding that achievable by random mutagenesis. Here, we first identified a number of proteins involved in cell fusion using a shotgun proteomics approach, then we investigated the role of these proteins namely tetraspanin CD81/CD9, ADAM10, GTP-binding protein ?13, radixin, myosin regulatory light chain and RhoA in the regulation of colon cancer cell fusion. We also found a previously unrecognized role of ADAM10, G?13 and RhoA in promoting cell fusion. Finally, we show that the occurrence of cell fusion in a metastatic model of colon carcinoma causes the appearance of cells resistant to both 5-fluorouracil and oxaliplatin. These findings highlight the importance of cell fusion in cancer progression and raise significant implications for overcoming chemoresistance in metastatic colon cancer. PMID:22751128

Carloni, V; Mazzocca, A; Mello, T; Galli, A; Capaccioli, S

2012-07-02

263

Bent shaft motor  

DOEpatents

A nonelectromagnetic motor comprising a base, a bent shaft which is rotable relative to the base wherein the bent shaft comprises a straight portion aligned with a main axis and an offset portion that is offset with respect to the main axis; and a drive means for driving the offset portion of the bent shaft along a generally circular path in a plane perpendicular to the main axis to rotate the bent shaft. The bent shaft and drive means for driving the bent shaft can be selected from piezoelectric, magnetostrictive, rheological and shape memory alloys. The drive means of the nonelectromagnetic motor can additionally comprise a shell which shell surrounds and houses the bent shaft and precesses or gyrates which in turn causes the bent drive shaft to rotate. The nonelectromagnetic motor does not rely on friction for the application of torque upon a rotor.

Benavides, Gilbert L. (Albuquerque, NM)

1998-01-01

264

Basics of AC Motors  

NSDL National Science Digital Library

This course is one of the quickStep series offered by Siemens in AC Motors. These are FREE on-line industrial knowledge building tutorials. quickSTEPs are a great start for industry novices moving into technical jobs or staff in operational support rolls. They can also be very effectively used as out of class assignments for review or to build fundamental skills. Each course includes: an online tutorial organized as a number of units, lessons with self check quiz questions, a glossary of terms, a self-check final exam with scoring, an extensive downloadable PDF study guide. This course covers: motor basics, NEMA motors, Siemens motorr, final exam, a glossary, plus a 116 page study guide.

2008-11-26

265

Micromachine Wedge Stepping Motor  

SciTech Connect

A wedge stepping motor, which will index a mechanism, has been designed and fabricated in the surface rnicromachine SUMMiT process. This device has demonstrated the ability to index one gear tooth at a time with speeds up to 205 teeth/see. The wedge stepper motor has the following features, whi:h will be useful in a number of applications. o The ability to precisely position mechanical components. . Simple pulse signals can be used for operation. o Only 2 drive signals are requixed for operation. o Torque and precision capabilities increase with device size . The device to be indexed is restrained at all times by the wedge shaped tooth that is used for actuation. This paper will discuss the theory of operation and desi=m of the wedge stepping motor. The fabrication and testing of I he device will also be presented.

Allen, J.J.; Schriner, H.K.

1998-11-04

266

Tuning the flagellar motor.  

PubMed

Many bacteria are motile by means of flagella, semi-rigid helical filaments rotated at the filament's base and energized by proton or sodium-ion gradients. Torque is created between the two major components of the flagellar motor: the rotating switch complex and the cell-wall-associated stators, which are arranged in a dynamic ring-like structure. Being motile provides a survival advantage to many bacteria, and thus the flagellar motor should work optimally under a wide range of environmental conditions. Recent studies have demonstrated that numerous species possess a single flagellar system but have two or more individual stator systems that contribute differentially to flagellar rotation. This review describes recent findings on rotor-stator interactions, on the role of different stators, and on how stator selection could be regulated. An emerging model suggests that bacterial flagellar motors are dynamic and can be tuned by stator swapping in response to different environmental conditions. PMID:20203052

Thormann, Kai M; Paulick, Anja

2010-03-04

267

Investigation of SNARE-Mediated Membrane Fusion Mechanism Using Atomic Force Microscopy  

NASA Astrophysics Data System (ADS)

Membrane fusion is driven by specialized proteins that reduce the free energy penalty for the fusion process. In neurons and secretory cells, soluble N-ethylmaleimide-sensitive factor-attachment protein (SNAP) receptors (SNAREs) mediate vesicle fusion with the plasma membrane during vesicular content release. Although, SNAREs have been widely accepted as the minimal machinery for membrane fusion, the specific mechanism for SNARE-mediated membrane fusion remains an active area of research. Here, we summarize recent findings based on force measurements acquired in a novel experimental system that uses atomic force microscope (AFM) force spectroscopy to investigate the mechanism(s) of membrane fusion and the role of SNAREs in facilitating membrane hemifusion during SNARE-mediated fusion. In this system, protein-free and SNARE-reconstituted lipid bilayers are formed on opposite (trans) substrates and the forces required to induce membrane hemifusion and fusion or to unbind single v-/t-SNARE complexes are measured. The obtained results provide evidence for a mechanism by which the pulling force generated by interacting trans-SNAREs provides critical proximity between the membranes and destabilizes the bilayers at fusion sites by broadening the hemifusion energy barrier and consequently making the membranes more prone to fusion.

Abdulreda, Midhat H.; Moy, Vincent T.

2009-08-01

268

Bayesian fusion of hyperspectral astronomical images  

NASA Astrophysics Data System (ADS)

The new integral-field spectrograph MUSE will acquire hyperspectral images of the deep sky, requiring huge amounts of raw data to be processed, posing a challenge to modern algorithms and technologies. In order to achieve the required sensitivity to observe very faint objects, many observations need to be reconstructed and co-added into a single data cube. In this paper, we propose a new fusion method to combine all raw observations while removing most of the instrumental and observational artifacts such as blur or cosmic rays. Thus, the results can be accurately and consistently analyzed by astronomers. We use a Bayesian framework allowing for optimal data fusion and uncertainty estimation. The knowledge of the instrument allows to write the direct problem (data acquisition on the detector matrix) and then to invert it through Bayesian inference, assuming a smoothness prior for the data cube to be reconstructed. Compared to existing methods, the originality of the new technique is in the propagation of errors throughout the fusion pipeline and the ability to deal with various acquisition parameters for each input image. For this paper, we focus on small-size, simulated astronomical observations with varying parameters to validate the image formation model, the reconstruction algorithm and the predicted uncertainties.

Jalobeanu, André; Petremand, Matthieu; Collet, Christophe

2011-03-01

269

Fusion power plant economics  

Microsoft Academic Search

The rationale, methodology, and updated comparative results of cost projections for magnetic-fusion-energy central-station electric power plants are considered. Changing market and regulatory conditions, particularly in the U.S., prompt fundamental reconsideration of what constitutes a competitive future energy-source technology and has implications for the direction and emphasis of appropriate near-term research and development programs, for fusion and other advanced generation systems.

1996-01-01

270

Magnetic fusion reactor economics  

Microsoft Academic Search

An almost primordial trend in the conversion and use of energy is an increased complexity and cost of conversion systems designed to utilize cheaper and more-abundant fuels; this trend is exemplified by the progression fossil?fission?fusion. The present projections of the latter indicate that capital costs of the fusion “burner” far exceed any commensurate savings associated with the cheapest and most-abundant

Robert A. Krakowski

1995-01-01

271

(Fusion reactor materials)  

Microsoft Academic Search

The purpose of this trip is to participate and present a paper in the Fourth International Conference on Fusion Reactor Materials (ICFRM-4) at Kyoto, Japan, December 4--8, 1989; and to participate in two workshops at the University of Tokyo: (1) Fusion Reactor Fuel-Materials Interactions, December 11--12, 1989, and (2) P-149, United States-Japan Workshop on Evaluation of Radiation Damage in Ceramics

1990-01-01

272

Fusion power development pathways  

Microsoft Academic Search

During the national fusion program Technical Planning Activity (TPA) led by Argonne National Laboratory, it was proposed that a systematic activity be initiated called Development Pathways Analysis. This activity was defined as {open_quotes}developing and applying methodologies for assessing the cost, risk, and schedule impacts of differing approaches to fusion development.{close_quotes} The TPA report states that an {open_quotes}important objective is to

Stephen O. Dean

1993-01-01

273

Inertial fusion program  

Microsoft Academic Search

Progress in the development of high-energy short-pulse carbon dioxide laser systems for fusion research is reported. Improvements for the Gemini System and the eight-beam system Helios are summarized and the 100- to 200-TW Antares target irradiation system is discussed. Other topics covered include: (1) phase conjugation by degenerate four-wave mixing and its applicability to laser fusion system; (2) frequency multiplexing

F. Skoberne

1981-01-01

274

Inertial fusion program  

Microsoft Academic Search

Progress in the development of high energy short pulse CO2 laser systems for fusion research is reported. Improvements to a two-beam system, Gemini, are outlined and experimental results discussed. An eight-beam system, Helios, was fired successfully on target for the first time, and became the world's most powerful gas laser for laser fusion studies. Work on Antares, a 100 to

R. B. Perkins; F. Skoberne

1980-01-01

275

Biology of Spine Fusion  

Microsoft Academic Search

Spinal fusion was first reported in the United States in 1911 by Hibbs and Albee for the treatment of scoliosis and tuberculosis\\u000a (1,2). Since that time, the indications for spinal arthrodesis have continued to increase, and, in the late 1990s, approx 250,000\\u000a spinal fusions were performed each year in the United States (3,4). The rate of nonunion after spinal arthrodesis

K. Craig Boatright; Scott D. Boden

276

Fusion ignition research experiment  

SciTech Connect

Understanding the properties of high gain (alpha-dominated) fusion plasmas in an advanced toroidal configuration is the largest remaining open issue that must be addressed to provide the scientific foundation for an attractive magnetic fusion reactor. The critical parts of this science can be obtained in a compact high field tokamak which is also likely to provide the fastest and least expensive path to understanding alpha-dominated plasmas in advanced toroidal systems.

Dale Meade

2000-07-18

277

Cold nuclear fusion  

SciTech Connect

Recent accelerator experiments on fusion of various elements have clearly demonstrated that the effective cross-sections of these reactions depend on what material the target particle is placed in. In these experiments, there was a significant increase in the probability of interaction when target nuclei are imbedded in a conducting crystal or are a part of it. These experiments open a new perspective on the problem of so-called cold nuclear fusion.

Tsyganov, E. N., E-mail: edward.tsyganov@utsouthwestern.edu [University of Texas Southwestern Medical Center at Dallas (United States)

2012-02-15

278

Motor current signature analysis method for diagnosing motor operated devices  

DOEpatents

A motor current noise signature analysis method and apparatus for remotely monitoring the operating characteristics of an electric motor-operated device such as a motor-operated valve. Frequency domain signal analysis techniques are applied to a conditioned motor current signal to distinctly identify various operating parameters of the motor driven device from the motor current signature. The signature may be recorded and compared with subsequent signatures to detect operating abnormalities and degradation of the device. This diagnostic method does not require special equipment to be installed on the motor-operated device, and the current sensing may be performed at remote control locations, e.g., where the motor-operated devices are used in accessible or hostile environments.

Haynes, Howard D. (Kingston, TN); Eissenberg, David M. (Oak Ridge, TN)

1990-01-01

279

Tuning Multiple Motor Travel Via Single Motor Velocity  

PubMed Central

Microtubule-based molecular motors often work in small groups to transport cargos in cells. A key question in understanding transport (and its regulation in vivo) is to identify the sensitivity of multiple-motor-based motion to various single molecule properties. Whereas both single-motor travel distance and microtubule binding rate have been demonstrated to contribute to cargo travel, the role of single-motor velocity is yet to be explored. Here, we recast a previous theoretical study, and make explicit a potential contribution of velocity to cargo travel. We test this possibility experimentally, and demonstrate a strong negative correlation between single-motor velocity and cargo travel for transport driven by two motors. Our study thus discovers a previously unappreciated role of single-motor velocity in regulating multiple-motor transport.

Xu, Jing; Shu, Zhanyong; King, Stephen J.; Gross, Steven P.

2012-01-01

280

Cognitive motor processes: the role of motor imagery in the study of motor representations.  

PubMed

Motor imagery is viewed as a window to cognitive motor processes and particularly to motor control. Mental simulation theory [Jeannerod, M., 2001. Neural simulation of action: a unifying mechanism for motor cognition. NeuroImage 14, 103-109] stresses that cognitive motor processes such as motor imagery and action observation share the same representations as motor execution. This article presents an overview of motor imagery studies in cognitive psychology and neuroscience that support and extend predictions from mental simulation theory. In general, behavioral data as well as fMRI and TMS data demonstrate that motor areas in the brain play an important role in motor imagery. After discussing results on a close overlap between mental and actual performance durations, the review focuses specifically on studies reporting an activation of primary motor cortex during motor imagery. This focus is extended to studies on motor imagery in patients. Motor imagery is also analyzed in more applied fields such as mental training procedures in patients and athletes. These findings support the notion that mental training procedures can be applied as a therapeutic tool in rehabilitation and in applications for power training. PMID:19167426

Munzert, Jörn; Lorey, Britta; Zentgraf, Karen

2009-01-07

281

ITER Fusion Energy  

ScienceCinema

ITER (in Latin “the way”) is designed to demonstrate the scientific and technological feasibility of fusion energy. Fusion is the process by which two light atomic nuclei combine to form a heavier over one and thus release energy. In the fusion process two isotopes of hydrogen – deuterium and tritium – fuse together to form a helium atom and a neutron. Thus fusion could provide large scale energy production without greenhouse effects; essentially limitless fuel would be available all over the world. The principal goals of ITER are to generate 500 megawatts of fusion power for periods of 300 to 500 seconds with a fusion power multiplication factor, Q, of at least 10. Q ? 10 (input power 50 MW / output power 500 MW). The ITER Organization was officially established in Cadarache, France, on 24 October 2007. The seven members engaged in the project – China, the European Union, India, Japan, Korea, Russia and the United States – represent more than half the world’s population. The costs for ITER are shared by the seven members. The cost for the construction will be approximately 5.5 billion Euros, a similar amount is foreseen for the twenty-year phase of operation and the subsequent decommissioning.

282

Fusion energy breakthrough  

NASA Astrophysics Data System (ADS)

The physics of harnessing nuclear fusion as a heat source is not well known. No such power generator has been made yet and significant breakthroughs will be necessary before the concept is proven. All such advances in energy research are followed with keen interest by geophysicists. One such breakthrough was made recently at the Massachusetts Institute of Technology (MIT) in experiments with a model Tokamak fusion reactor.The MIT experimental high-field nuclear fusion reactor with the name of Alcator-C experienced a large technological advance when its operating parameters exceeded the socalled “Lawson criterion,” one of the minimum requirements of a successful nuclear fusion power generator. The nuclear fusion of hydrogen to form helium releases heat, but to make such a process workable for a power plant, there must be a sizable efficiency in the ratio of energy input to bring about the reaction to the thermal energy released by the reaction, and even this advance falls far short of the breakeven point. The advance is, however, a great step in the learning curve about fusion magnetohydrodynamic plasma systems.

Bell, Peter M.

283

Is the human primary motor cortex involved in motor imagery?  

Microsoft Academic Search

Participation of the primary motor cortex (M1) in motor imagery was addressed using functional magnetic resonance imaging at 2.0 T and 2×2×4 mm3 resolution in six right-handed subjects. Paradigms comprised visually cued execution and imagination of a sequential finger-to-thumb opposition task (12 s) contrasted with motor rest and visual imagery (18 s), respectively. Motor execution activated M1 as well as

Peter Dechent; Klaus-Dietmar Merboldt; Jens Frahm

2004-01-01

284

Multiple propellant solid rocket motor  

NASA Astrophysics Data System (ADS)

An integrated stage solid propellant rocket motor arrangement provides boost and repeated throttling post-boost operations on demand and includes an attitude control system. The rocket motor includes a plurality of casings for enclosing an initial boost motor, a post-boost motor, and gas generator means for producing gases that are used for reignition of the post-boost motor and as a motive source for the attitude control system. The boost motor and the post-boost motor are contained within the same enclosure but are separated by an internal bulkhead. The rocket motor has a plurality of nozzles, one of which is located aft of the boost motor and another located within the internal bulkhead that separates the boost and post-boost motors. The rocket motor of the invention has application in many propulsion systems, including strategic systems requiring both boost and post-boost propulsion, advanced antiballistic missile interceptors requiring boost/sustain thrust and on/off operation, and in space motors for deploying satellites by accomplishing both perigee and apogee burns with a single motor or as an on-demand orbit transfer vehicle for changing orbits.

McDonald, Allan J.

1994-03-01

285

17 CFR 210.3-05 - Financial statements of businesses acquired or to be acquired.  

Code of Federal Regulations, 2010 CFR

... 2010-04-01 false Financial statements of businesses acquired or...CONTENT OF AND REQUIREMENTS FOR FINANCIAL STATEMENTS, SECURITIES ACT OF 1933...General Instructions As to Financial Statements § 210.3-05...

2010-04-01

286

17 CFR 210.3-05 - Financial statements of businesses acquired or to be acquired.  

Code of Federal Regulations, 2013 CFR

... 2013-04-01 false Financial statements of businesses acquired or...CONTENT OF AND REQUIREMENTS FOR FINANCIAL STATEMENTS, SECURITIES ACT OF 1933...General Instructions As to Financial Statements § 210.3-05...

2013-04-01

287

17 CFR 210.3-05 - Financial statements of businesses acquired or to be acquired.  

Code of Federal Regulations, 2010 CFR

... 2009-04-01 false Financial statements of businesses acquired or...CONTENT OF AND REQUIREMENTS FOR FINANCIAL STATEMENTS, SECURITIES ACT OF 1933...General Instructions As to Financial Statements § 210.3-05...

2009-04-01

288

Preferential Reinnervation of Motor Nerves by Regenerating Motor Axons  

Microsoft Academic Search

Regeneration of axons into inappropriate distal nerve branches may adversely affect functional recovery after pe- ripheral nerve suture. The degree to which motor axons rein- nervate sensory nerves, and vice versa, has not been de- termined. In these experiments, HRP is used to quantify the sensory and motor neurons that reinnervate sensory and motor branches of the rat femoral nerve

Thomas M. E. Brushart

289

The possible benefits of reduced errors in the motor skills acquisition of children  

PubMed Central

An implicit approach to motor learning suggests that relatively complex movement skills may be better acquired in environments that constrain errors during the initial stages of practice. This current concept paper proposes that reducing the number of errors committed during motor learning leads to stable performance when attention demands are increased by concurrent cognitive tasks. While it appears that this approach to practice may be beneficial for motor learning, further studies are needed to both confirm this advantage and better understand the underlying mechanisms. An approach involving error minimization during early learning may have important applications in paediatric rehabilitation.

2012-01-01

290

The possible benefits of reduced errors in the motor skills acquisition of children.  

PubMed

An implicit approach to motor learning suggests that relatively complex movement skills may be better acquired in environments that constrain errors during the initial stages of practice. This current concept paper proposes that reducing the number of errors committed during motor learning leads to stable performance when attention demands are increased by concurrent cognitive tasks. While it appears that this approach to practice may be beneficial for motor learning, further studies are needed to both confirm this advantage and better understand the underlying mechanisms. An approach involving error minimization during early learning may have important applications in paediatric rehabilitation. PMID:22230189

Capio, Catherine M; Sit, Cindy Hp; Abernethy, Bruce; Masters, Rich Sw

2012-01-09

291

interviewing children with Acquired Brain Injury (ABI)  

Microsoft Academic Search

Research into the lives of children with acquired brain injury (ABI) often neglects to incorporate children as participants, preferring to obtain the opinions of the adult carer (e.g. McKinlay et al., 2002). There has been a concerted attempt to move away from this position by those working in children’s research with current etiquette highlighting the inclusion of children and the

Anne-Marie Boylan; Mark Linden; Fiona Alderdice

2009-01-01

292

Acquired (Drug-Induced) Long QT Syndrome  

Microsoft Academic Search

The most common cause of acquired drug-induced long QT syndrome (ADILQTS) in clinical practice is an exposure of the heart\\u000a to drugs known for their potential to prolong the QT interval. It has long been recognized that most drugs that prolong the\\u000a duration of the QT interval can cause fatal tachyarrhythmias. However, it took decades to sensitize medical and scientific

Jeffrey S. Litwin; Robert B. Kleiman; Ihor Gussak

293

Selectively acquiring ratings for product recommendation  

Microsoft Academic Search

ABSTRACT Accurate prediction of customer, preferences ,on products ,is the key to any,recommender,systems to realize its promised,strategic values,such ,as improved ,customer satisfaction ,and ,therefore enhanced loyalty. In this paper, we propose proactively acquiring ratings from customers for a newly,introduced product to quickly improve,the accuracy ,of the ,predicted ratings generated by a collaborative filtering recommendation ,algorithm for the entire customer,population. We

Zan Huang

2007-01-01

294

Hyponatremia in pediatric community-acquired pneumonia  

Microsoft Academic Search

Studies focusing on serum sodium disorders in children with community-acquired-pneumonia (CAP) are nearly entirely lacking,\\u000a though clinical experience suggests that at least hyponatremia (HN) might be rather common. We evaluated the incidence of\\u000a hypo- and hypernatremia, in relation to other clinical, laboratory and etiological findings, in pediatric CAP. Serum sodium\\u000a concentration was measured in 108 ambulatory and hospitalized children with

Massimiliano Don; Giuliana Valerio; Matti Korppi; Mario Canciani

2008-01-01

295

The clinical significance of acquired jejunoileal diverticula  

Microsoft Academic Search

Objective:Because of the relative rarity of acquired jejunoileal diverticulosis, including its symptomatology and complications, diagnosis is often difficult and delayed, resulting in unnecessary morbidity and mortality. The purpose of the present study was to draw attention to jejunoileal diverticula and their complications as a site of gastrointestinal symptoms.Methods:The records of 10 patients with symptomatic jejunoileal diverticula treated in our departments

E de Bree; J. Grammatikakis; M. Christodoulakis; D. Tsiftsis

1998-01-01

296

Acquired Antibiotic Resistance Genes: An Overview  

PubMed Central

In this review an overview is given on antibiotic resistance (AR) mechanisms with special attentions to the AR genes described so far preceded by a short introduction on the discovery and mode of action of the different classes of antibiotics. As this review is only dealing with acquired resistance, attention is also paid to mobile genetic elements such as plasmids, transposons, and integrons, which are associated with AR genes, and involved in the dispersal of antimicrobial determinants between different bacteria.

van Hoek, Angela H. A. M.; Mevius, Dik; Guerra, Beatriz; Mullany, Peter; Roberts, Adam Paul; Aarts, Henk J. M.

2011-01-01

297

Intrinsic and acquired resistance mechanisms in enterococcus  

PubMed Central

Enterococci have the potential for resistance to virtually all clinically useful antibiotics. Their emergence as important nosocomial pathogens has coincided with increased expression of antimicrobial resistance by members of the genus. The mechanisms underlying antibiotic resistance in enterococci may be intrinsic to the species or acquired through mutation of intrinsic genes or horizontal exchange of genetic material encoding resistance determinants. This paper reviews the antibiotic resistance mechanisms in Enterococcus faecium and Enterococcus faecalis and discusses treatment options.

Hollenbeck, Brian L.; Rice, Louis B.

2012-01-01

298

Brucella abortus infection acquired in microbiology laboratories.  

PubMed

We report an outbreak of laboratory-acquired Brucella abortus infection originating in the accidental breakage of a centrifuge tube. A total of 12 laboratory workers were infected (attack rate of 31%), with an incubation time ranging from 6 weeks to 5 months. Antibody titers were evaluated weekly in all personnel exposed, allowing the diagnosis of the infection in most cases before the onset of clinical symptoms, so that specific therapy could be administrated. PMID:10790142

Fiori, P L; Mastrandrea, S; Rappelli, P; Cappuccinelli, P

2000-05-01

299

Acquired dermal melanocytosis: Appearance during pregnancy  

Microsoft Academic Search

We report the first case of acquired dermal melanocytosis (ADM) appearing during pregnancy. A 23-year-old Hispanic woman presented to the Dermatology Clinic of Columbia-Presbyterian Medical Center during the second trimester of pregnancy with a nonpalpable blue-gray patch with interspersed discrete brown macules on the right lower extremity. It had appeared during the first trimester of pregnancy. Cutaneous biopsy specimens revealed

Adam I. Rubin; S. Van Laborde; Matthew J. Stiller

2001-01-01

300

Domestically acquired fascioliasis in northern california.  

PubMed

Abstract. Two cases of domestically acquired fascioliasis are reported. Patient One was a 63-year-old male who developed a febrile illness 2 months after eating watercress in Marin County. Patient Two was a 38-year-old male who had eaten watercress with Patient One, and also developed a febrile illness. Both patients had eosinophilia and liver lesions on imaging. Diagnosis was made by serology and treatment was with triclabendazole. PMID:23836562

Weisenberg, Scott A; Perlada, David E

2013-07-08

301

Self-awareness after acquired brain injury  

Microsoft Academic Search

Objective To investigate the factors contributing to deficit in self-awareness following acquired brain injury and to study change in self-awareness during a group support program. Methods Sixty-two patients (mean age: 35.4±15.3 years) attending our Service (295±525 days after injury) were included in the study (41 of them had sustained a head injury). Thirty-six patients were admitted to a multidisciplinary rehabilitation

E. Noé; J. Ferri; M. C. Caballero; R. Villodre; A. Sanchez; J. Chirivella

2005-01-01

302

Hospital-acquired urinary tract infections  

Microsoft Academic Search

Hospital-acquired urinary tract infections have a great impact on clinical medicine. They are almost exclusively complicated urinary tract infections. Clinical diagnosis in some patients. (e.g., sedated patients, paediatric or geriatric patients) might be delayed for the lack of symptoms. About 80% of urinary tract infections are catheter-associated. However, certain diseases favour urinary tract infections: diabetes mellitus or cystic renal diseases,

F. M. E Wagenlehner; K. G Naber

2000-01-01

303

Chlamydia pneumoniae in community-acquired pneumonia.  

PubMed

Chlamydia pneumoniae has been established recently as an important human respiratory pathogen. The aim of this study was to define the prevalence of C. pneumoniae in community-acquired pneumonia. We prospectively investigated adult patients who were treated as inpatients and outpatients. Acute and convalescent serum samples were obtained from each patient. Serological diagnosis of C. pneumoniae infection was determined by enzyme-linked immunosorbent assay (ELISA). Eighty paired sera were tested for C. pneumoniae-specific IgM, IgG and IgA. Twenty-one patients (26.2%) had serological results compatible with acute C. pneumoniae infection. Eighteen (85.7%) of these infected patients were C. pneumoniae-specific IgM positive, three had a seroconversion of IgA and two had a four-fold or greater increase in C. pneumoniae-specific IgG antibody titer. The most common clinical manifestations of community-acquired pneumonia due to C. pneumoniae were fever (100%), cough (100%), chest pain (47.6%) and shortness of breath (42.9%). Physical examination revealed crackle in 85.7 per cent of the cases. These findings suggest that C. pneumoniae is a common cause of community-acquired pneumonia in Thailand. PMID:11281503

Wattanathum, A; Boonyongsunchai, P; Palwatwichai, A; Limpairojn, N; Chanbancherd, P; Chanthadisai, N

2001-01-01

304

Blood group antigens acquired from the plasma.  

PubMed

In some blood group systems, the plasma contains an antigen that is not synthesized by the red cell precursors but that contributes to the red cell phenotype. This antigen may be glycolipid (eg, ABH and Lewis) or glycoprotein (eg, Chido and Rodgers). The amount of ABH glycolipid in plasma is affected by the secretor and Lewis genes, and is greatest in those secretors who lack the Le gene. ABH taken up by the red cell from plasma is a type 1 glycolipid, whereas ABH glycolipid intrinsic to the red cell is type 2. Thus only those antibodies directed against type 1 glycolipid will detect ABH antigen acquired from the plasma. For example, type 1 A is detected by the antibody in group O donors but rarely by the antibody in group B donors. Lymphocytotoxic reactions which, at first, appear to be due to new specificities are sometimes due to the presence of type 1 glycolipids with ABH and Lewis specificity, acquired by lymphocytes from the plasma. Chido (Ch) and Rodgers (Rg) are antigens of C4, a glycoprotein. These antigens are acquired by the red cells when complement is activated. PMID:6158741

Crookston, M C

1980-01-01

305

Bacterial Degradation of Motor Oil.  

National Technical Information Service (NTIS)

This study examines the disposition of motor oil, the type of petroleum likely to be associated with nearshore discharges and wastewater effluent. Motor oil was subjected to degradation by naturally occurring microbial populations cultered under condition...

J. D. Walker R. R. Colwell L. Petrakis

1975-01-01

306

Electric motor model repair specifications  

SciTech Connect

These model repair specifications list the minimum requirements for repair and overhaul of polyphase AC squireel cage induction motors. All power ranges, voltages, and speeds of squirrel cage motors are covered.

NONE

1995-08-01

307

Linear Magnetic Motor/Generator.  

National Technical Information Service (NTIS)

A linear magnetic motor/generator is disclosed which uses magnetic flux to provide mechanical motion or electrical energy. The linear magnetic motor/generator includes an axially movable actuator mechanism. A permament magnet mechanism defines a first mag...

P. A. Studer

1982-01-01

308

Energy Saving Electrical Motor Control System.  

National Technical Information Service (NTIS)

An energy saving system in AC electrical motors which provides optimum control of the rriac control voltage supplied to different motors with which the system is used, despite the different characteristics of such motors is described. A three phase motor,...

T. M. Edge

1982-01-01

309

29 CFR 1926.601 - Motor vehicles.  

Code of Federal Regulations, 2013 CFR

...2013-07-01 2013-07-01 false Motor vehicles. 1926.601 Section 1926.601...REGULATIONS FOR CONSTRUCTION Motor Vehicles, Mechanized Equipment, and Marine Operations § 1926.601 Motor vehicles. (a) Coverage. Motor...

2013-07-01

310

Tandem motors reduce well costs  

SciTech Connect

The new generation of tandem mud motors that recently appeared on the drilling scene is significantly affecting drilling efficiency worldwide. These motors provide drillers with increased horsepower at the bit, higher torque, and faster rates of penetration (ROP). With advanced engineering and more durable materials, motor life is being extended, thereby increasing the time between bit trips and reducing drilling costs. This article reviews the performance, design, and operation of these motors.

Hooper, M.; Daigle, C. [Halliburton Energy Services, Houston, TX (United States); Crowe, R. [Halliburton Energy Services, Aberdeen (United Kingdom)

1995-10-01

311

Microprocessor controller for stepping motors  

Microsoft Academic Search

A new concept for digital computer control of multiple stepping motors which operate in a severe electromagnetic pulse environment is presented. The motors position mirrors in the beam-alignment system of a 100-kJ COâ laser. An asynchronous communications channel of a computer is used to send coded messages, containing the motor address and stepping-command information, to the stepping-motor controller in a

B. G. Strait; M. E. Thuot

1977-01-01

312

Metacognition in Motor Learning  

Microsoft Academic Search

Research on judgments of verbal learning has demonstrated that participants' judgments are unreliable and often overconfident. The authors studied judgments of perceptual–motor learning. Participants learned 3 keystroke patterns on the number pad of a computer, each requiring that a different sequence of keys be struck in a different total movement time. Practice trials on each pattern were either blocked or

Dominic A. Simon; Robert A. Bjork

2001-01-01

313

Ironless Armature Torque Motor.  

National Technical Information Service (NTIS)

Four iron-less armature torque motors, four Hall device position sensor assemblies, and two test fixtures were fabricated. The design approach utilized samarium cobalt permanent magnets, a large airgap, and a three-phase winding in a stationary ironless a...

R. L. Fisher

1972-01-01

314

Solid rocket motors  

NASA Astrophysics Data System (ADS)

Structural requirements, materials and, especially, processing are critical issues that will pace the introduction of new types of solid rocket motors. Designers must recognize and understand the drivers associated with each of the following considerations: (1) cost; (2) energy density; (3) long term storage with use on demand; (4) reliability; (5) safety of processing and handling; (6) operability; and (7) environmental acceptance.

Carpenter, Ronn L.

1993-02-01

315

Alarr Spin Motor Test.  

National Technical Information Service (NTIS)

The spin motor for the Air-Launched Air-Recoverable Rocket (ALARR) vehicle is designed to provide the spin required by the NESCO payload for its operation. A secondary objective is to maintain the vehicle orientation during payload operation above 300,000...

R. G. Grisham

1967-01-01

316

The St. Louis Motor  

ERIC Educational Resources Information Center

|The St. Louis Motor, invented in 1909, is unique among physics apparatus for being named for a geographical place rather than a physicist. The sturdy little device (Fig. 1) has never been out of production. Any older school or physics department that has not done a catastrophic housecleaning in the last 20 years will certainly have a small flock…

Greenslade, Thomas B., Jr.

2011-01-01

317

The primate motor thalamus  

Microsoft Academic Search

The functional parcellation of the motor thalamus of primates has suffered from serious historical and technical drawbacks, which have led to extreme confusion. This is a problem when thalamic stereotaxy is again being use clinically. The cause usually imputed is the historical conflict between two main schools, the Vogt and the ‘Anglo-American’ (Michigan), which used different nomenclatures. In fact, the

G. Percheron; C. François; B. Talbi; J. Yelnik; G. Fénelon

1996-01-01

318

Multifocal motor neuropathy.  

PubMed

Multifocal motor neuropathy (MMN) is a chronic immune-mediated neuropathy that is particular for its asymmetric, multifocal, purely motor clinical presentation, often related to the distribution of individual nerves. Upper limbs are usually primarily and more severely affected, but lower limbs may be involved during the course of the disease. The hallmark of the disease is the presence, in electrophysiological studies, of persistent conduction blocks in the affected motor nerves, located outside the usual sites of nerve compression, contrasting with normal sensory nerve conduction velocities. The most typical laboratory finding is the presence of high levels of serum IgM antibodies to the ganglioside GM1, and less frequently to asialo-GM1, GD1a or GM2. These striking features may help distinguishing this neuropathy from both motor neuron disease and other chronic immune-mediated neuropathies. Several randomized controlled trials (RCT) have established the efficacy of high-dose intravenous immunoglobulin (IVIg), as well as subcutaneous immunoglobulin (SCIg). However, this therapy has a short-lasting effect, and need to be maintained with periodic infusions. This disappointing status has led to the search of other immune therapies whose efficacy has not been so far confirmed in RCT. This review intends to summarize current contents in the diagnosis and the treatment of MMN. PMID:23623583

Guimarăes-Costa, Raquel; Bombelli, Francesco; Léger, Jean-Marc

2013-04-25

319

Description of the Motor Development of 3-12 Month Old Infants with Down Syndrome: The Influence of the Postural Body Position  

ERIC Educational Resources Information Center

|The purpose of the present study was to describe the rate of motor development in infants with Down syndrome in the age range of 3-12 months and identify the difficulties both in performance and acquiring motor skills in prone, supine, sitting and standing positions. Nineteen infants with Down syndrome and 25 healthy full term typical infants…

Tudella, Eloisa; Pereira, Karina; Basso, Renata Pedrolongo; Savelsbergh, Geert J. P.

2011-01-01

320

Dopamine in Motor Cortex Is Necessary for Skill Learning and Synaptic Plasticity  

PubMed Central

Preliminary evidence indicates that dopamine given by mouth facilitates the learning of motor skills and improves the recovery of movement after stroke. The mechanism of these phenomena is unknown. Here, we describe a mechanism by demonstrating in rat that dopaminergic terminals and receptors in primary motor cortex (M1) enable motor skill learning and enhance M1 synaptic plasticity. Elimination of dopaminergic terminals in M1 specifically impaired motor skill acquisition, which was restored upon DA substitution. Execution of a previously acquired skill was unaffected. Reversible blockade of M1 D1 and D2 receptors temporarily impaired skill acquisition but not execution, and reduced long-term potentiation (LTP) within M1, a form of synaptic plasticity critically involved in skill learning. These findings identify a behavioral and functional role of dopaminergic signaling in M1. DA in M1 optimizes the learning of a novel motor skill.

Molina-Luna, Katiuska; Pekanovic, Ana; Rohrich, Sebastian; Hertler, Benjamin; Schubring-Giese, Maximilian; Rioult-Pedotti, Mengia-Seraina; Luft, Andreas R.

2009-01-01

321

Experiments with a DC Motor  

ERIC Educational Resources Information Center

Experiments with an electric motor provide good opportunity to demonstrate some basic laws of electricity and magnetism. The aim of the experiments with a low-power dc motor is to show how the motor approaches its steady rotation and how its torque, mechanical power and efficiency depend on the rotation velocity. The tight relationship between the…

Kraftmakher, Yaakov

2010-01-01

322

Motor Education: Educational Development Programs.  

ERIC Educational Resources Information Center

|This booklet presents educational programs and activities focusing on motor skills for 5- to 9-year-old children and older children with learning problems. The premise of the activities is that the acquisition of motor skills is essential to basic learning. The role of language as a mediator and controller of motor development is emphasized. The…

Tansley, A. E.

323

Na + -driven bacterial flagellar motors  

Microsoft Academic Search

Bacterial flagellar motors are the reversible rotary engine which propels the cell by rotating a helical flagellar filament as a screw propeller. The motors are embedded in the cytoplasmic membrane, and the energy for rotation is supplied by the electrochemical potential of specific ions across the membrane. Thus, the analysis of motor rotation at the molecular level is linked to

Yasuo Imae; Tatsuo Atsumi

1989-01-01

324

Duty Cycles and Motor Rating  

Microsoft Academic Search

The horsepower rating of a motor carries a dual implication??first, torque ability; second, temperature rise. The two are frequently confused. In selecting motors for duty-cycle jobs the two concepts should be considered separately. The motor rating and type should be chosen to fit the torque requirements of the job. The proper time rating or service factor to associate with this

L. E. Hildebrand

1939-01-01

325

News in Motor Cortical Physiology.  

PubMed

Motor cortical activity relates to static motor parameters (isometric force, limb position) under static conditions but predominantly to dynamic parameters (change of force, limb velocity) under dynamic conditions. This dual relation conceptually unifies the role of motor cortex in the control of isometric force and movement. PMID:11390822

Georgopoulos, Apostolos P.

1999-04-01

326

Experiments with a DC Motor  

ERIC Educational Resources Information Center

|Experiments with an electric motor provide good opportunity to demonstrate some basic laws of electricity and magnetism. The aim of the experiments with a low-power dc motor is to show how the motor approaches its steady rotation and how its torque, mechanical power and efficiency depend on the rotation velocity. The tight relationship between…

Kraftmakher, Yaakov

2010-01-01

327

Multiple stage miniature stepping motor  

DOEpatents

A stepping motor comprising a plurality of stages which may be selectively activated to effect stepping movement of the motor, and which are mounted along a common rotor shaft to achieve considerable reduction in motor size and minimum diameter, whereby sequential activation of the stages results in successive rotor steps with direction being determined by the particular activating sequence followed.

Niven, William A. (Livermore, CA); Shikany, S. David (Danville, CA); Shira, Michael L. (Fremont, CA)

1981-01-01

328

Spotting drives for large motors  

Microsoft Academic Search

High power line-fed, constant speed motors sometimes must be operated at very low speed for controlled positioning of the attached load equipment. This process is referred to as 'spotting' or 'inching'. Examples include cement grinding mills (both raw and finish) and metal processing rolls. These motors are usually medium voltage (>2300 V). Two methods of spotting motors have been used

B. Dick

2002-01-01

329

Learning motor primitives for robotics  

Microsoft Academic Search

The acquisition and self-improvement of novel motor skills is among the most important problems in robotics. Motor primitives offer one of the most promising frameworks for the application of machine learning techniques in this context. Employing an improved form of the dynamic systems motor primitives originally introduced by Ijspeert et al. [2], we show how both discrete and rhythmic tasks

Jens Kober; Jan Peters

2009-01-01

330

Separable Connectors for Large Motors  

Microsoft Academic Search

Continuing growth in electric motor size is coupled with greater need for reliable interconnection between motor and power system to minimize process downtime. Yet the many standards governing electrical clearance, moisture resistance, grounding, safety, and cooling of electrical apparatus have little to say about that interconnection located within the motor terminal box. The traditional bolted and taped terminal lug joints,

L. Bruce McClung; Richard L. Nailen; Dennis L. Rimmel

1977-01-01

331

The closed-loop human eye-brain-hand to computer (EBH-C) interface for hand sensory-motor coordination based on force tablet  

Microsoft Academic Search

The mechanism of the sensory-to-motor transformation as well as motor-to-sensory transformation of human beings has attracted much attention in recent years. As no efficient device can record hand intrinsic behavior, it is difficult to get its neuro-physiological models of sensory-motor coordination. In this paper, we offer a system to acquire the kinematics and kinetics information of human hand movement through

Zhongcheng Wu; Fei Shen; Le Kang; Mingxu Wei; Yong Yu; Bing Fang

2005-01-01

332

Inertial fusion program  

NASA Astrophysics Data System (ADS)

High energy short pulse CO2 laser systems for fusion research are discussed. Improvements in the eight beam Helios system are described. These improvements increased the reliability of the laser and permitted the firing of 290 shots, most of which delivered energies of approximately 8 kJ to the target. Modifications to Gemini are outlined, including the installation of a new target insertion mechanism. The redirection of the Antares program is discussed in detail, which will achieve a total energy of approximately 40 kJ with two beams. This redirection will bring Antares on line almost two years earlier than was possible with the full six beam system, although at a lower energy. Experiments with isentropically imploded Sirius-B targets are discussed, and X-ray radiation loss data from gold microballoons are presented, which show that these results are essentially identical with those obtained at glass laser wavelengths. Significant progress in characterizing laser fusion targets is reported. High quality metallic coatings, and the deposition of thick plastic coatings are described. Results in the development of X-ray diagnostics are reported, and research in the Los Alamos heavy ion fusion program is summarized. Results of investigations of phase conjugation research of gaseous saturable absorbers and of the use of alkali-halide crystals in a new class of saturable absorbers are summarized. New containment vessel concepts for Inertial Confinement Fusion reactors are discussed, and results of a scoping study of four fusion fission hybrid concepts are presented.

Skoberne, F.; Sinoradzki, H. M.

1981-10-01

333

STATs and macrophage fusion  

PubMed Central

Macrophages play a pivotal role in host defense against multiple foreign materials such as bacteria, parasites and artificial devices. Some macrophage lineage cells, namely osteoclasts and foreign body giant cells (FBGCs), form multi-nuclear giant cells by the cell–cell fusion of mono-nuclear cells. Osteoclasts are bone-resorbing cells, and are formed in the presence of RANKL on the surface of bones, while FBGCs are formed in the presence of IL-4 or IL-13 on foreign materials such as artificial joints, catheters and parasites. Recently, fusiogenic mechanisms and the molecules required for the cell–cell fusion of these macrophage lineage cells were, at least in part, clarified. Dendritic cell specific transmembrane protein (DC-STAMP) and osteoclast stimulatory transmembrane protein (OC-STAMP), both of which comprise seven transmembrane domains, are required for both osteoclast and FBGC cell–cell fusion. STAT6 was demonstrated to be required for the cell–cell fusion of FBGCs but not osteoclasts. In this review, advances in macrophage cell–cell fusion are discussed.

2013-01-01

334

Decentralized multiplatform data fusion  

NASA Astrophysics Data System (ADS)

The decentralized data fusion paradigm is the more general case of centralized fusion. Although centralized fusion is currently well understood and applied widely, a decentralized approach offers many (potential) advantages. These include significant improvements in modularity, fault tolerance, and scalability. In particular, decentralized techniques directly support the development of 'plug and play' systems, and can provide valuable insights into the relationship between system level performance and that of sensor sub-systems. There can also be a provable equivalence to optimal centralized algorithms. This paper describes the design of a preliminary, comprehensive demonstration of the concept of fully decentralized, modular sensing technology. The demonstrator will allow for multiple sensor platforms each equipped with one or more range-only, bearings-only, or range and bearing sensors providing limited view, asynchronous measurements of the target environment. This work builds on the latest developments in the information-based representations of the data fusion process, as these make explicit the value (or utility) of each data fusion decision.

Durrant-Whyte, Hugh F.; Deaves, Rob H.; Greenway, Phil

1998-08-01

335

Electric drive system with BLDC motor  

Microsoft Academic Search

With the resource supply becoming severe recently, the use of hybrid car or electric car is a necessity that it can reduce the need of oil. This paper presents BLDC motor is the best choice for high-efficiency motor and shows a design of control system for BLDC motor. With the comparison of DC motor, Induction Motor and BLDC motor, Analysis

Lin Bai

2011-01-01

336

Motor technology for mining applications advances  

SciTech Connect

AC motors are steadily replacing DC motors in mining and mineral processing equipment, requiring less maintenance. The permanent magnet rotor, or the synchronous motor, has enabled Blador to introduce a line of cooling tower motors. Synchronous motors are soon likely to take over from the induction motor. 1 photo.

Fiscor, S.

2009-08-15

337

Fusion after minimally disruptive anterior lumbar interbody fusion: Analysis of extreme lateral interbody fusion by computed tomography  

Microsoft Academic Search

BackgroundLess invasive fusion approaches, such as extreme lateral interbody fusion (XLIF), have proliferated, but few reports have critically assessed fusion rates. To date, no studies have reported computed tomography (CT) documented fusion rates following XLIF.

W. B. Rodgers; Edward J. Gerber; Jamie R. Patterson

2010-01-01

338

Hemispheric asymmetry of ipsilateral motor cortex activation during unimanual motor tasks: further evidence for motor dominance  

Microsoft Academic Search

Objectives: To test to which extent the increase in ipsilateral motor cortex excitability during unimanual motor tasks shows hemispheric asymmetry.Methods: Six right-handed healthy subjects performed one of several motor tasks of different complexity (including rest) with one hand (task hand) while the other hand (non-task hand) was relaxed. Focal transcranial magnetic stimulation was applied to the motor cortex ipsilateral to

Ulf Ziemann; Mark Hallett

2001-01-01

339

Similar cerebral motor plans for real and virtual actions.  

PubMed

A simple movement, such as pressing a button, can acquire different meanings by producing different consequences, such as starting an elevator or switching a TV channel. We evaluated whether the brain activity preceding a simple action is modulated by the expected consequences of the action itself. To further this aim, the motor-related cortical potentials were compared during two key-press actions that were identical from the kinematics point of view but different in both meaning and consequences. In one case (virtual grasp), the key-press started a video clip showing a hand moving toward a cup and grasping it; in the other case, the key-press did not produce any consequence (key-press). A third condition (real grasp) was also compared, in which subjects actually grasped the cup, producing the same action presented in the video clip. Data were collected from fifteen subjects. The results showed that motor preparation for virtual grasp (starting 3 s before the movement onset) was different from that of the key-press and similar to the real grasp preparation-as if subjects had to grasp the cup in person. In particular, both virtual and real grasp presented a posterior parietal negativity preceding activity in motor and pre-motor areas. In summary, this finding supports the hypothesis that motor preparation is affected by the meaning of the action, even when the action is only virtual. PMID:23112847

Bozzacchi, Chiara; Giusti, Maria Assunta; Pitzalis, Sabrina; Spinelli, Donatella; Di Russo, Francesco

2012-10-24

340

Heavy ion inertial fusion  

NASA Astrophysics Data System (ADS)

Inertial fusion has not yet been as well explored as magnetic fusion but can offer certain advantages as an alternative source of electric energy for the future. Present experiments use high-power beams from lasers and light-ion diodes to compress the deuterium-tritium (D-T) pellets but these will probably be unsuitable for a power plant. A more promising method is to use intense heavy-ion beams from accelerator systems similar to those used for nuclear and high-energy physics. The very high beam power needed poses new design questions, from the ion source through the accelerating system, the beam transport system, to the final focus. These problems will require extensive study, both theoretically and experimentally, over the next several years before an optimum design for an inertial fusion driver can be arrived at.

Keefe, D.; Sessler, A. M.

1980-07-01

341

Cryogenics for Fusion  

NASA Astrophysics Data System (ADS)

Fusion of Hydrogen to produce energy is one of the technologies under study to meet the mankind raising need in energy and as a substitute to fossil fuels for the future. This technology is under investigation for more than 30 years already, with, for example, the former construction of the experimental reactors Tore Supra, DIII-D and JET. With the construction of ITER to start, the next step to ``fusion for energy'' will be done. In these projects, an extensive use of cryogenic systems is requested. Air Liquide has been involved as cryogenic partner in most of former and presently constructed fusion reactors. In the present paper, a review of the cryogenic systems we delivered to Tore Supra, JET, IPR and KSTAR will be presented.

Dauguet, P.; Gistau-Baguer, G. M.; Bonneton, M.; Boissin, J. C.; Fauve, E.; Bernhardt, J. M.; Beauvisage, J.; Andrieu, F.

2008-03-01

342

Inertial fusion program  

NASA Astrophysics Data System (ADS)

Progress in the development of high-energy short-pulse carbon dioxide laser systems for fusion research is reported. Improvements for the Gemini System and the eight-beam system Helios are summarized and the 100- to 200-TW Antares target irradiation system is discussed. Other topics covered include: (1) phase conjugation by degenerate four-wave mixing and its applicability to laser fusion system; (2) frequency multiplexing as a means toward multipulse energy extraction; (3) experiments with targets designed accurate diagnostics; (4) the detection of expanding ions, neutron yield, and X-ray emission; (5) target design codes for use with the CRAY-1 computer; (6) implosion phenomena; (7) the development of a ICF reactor blanket that offers a promising alternative to the usual lithium blanket; and (8) the formulation of capital-cost data base for laser fusion reactors.

Skoberne, F.

1981-06-01

343

Ceramics for fusion devices  

SciTech Connect

Ceramics are required for a number of applications in fusion devices, among the most critical of which are magnetic coil insulators, windows for RF heating systems, and structural uses. Radiation effects dominate consideration of candidate materials, although good pre-irradiation properties are a requisite. Materials and components can be optimized by careful control of chemical and microstructural content, and application of brittle material design and testing techniques. Future directions for research and development should include further extension of the data base in the areas of electrical, structural, and thermal properties; establishment of a fission neutron/fusion neutron correlation including transmutation gas effects; and development of new materials tailored to meet the specific needs of fusion reactors.

Clinard, F.W. Jr.

1984-01-01

344

Ceramics for fusion applications  

SciTech Connect

Ceramics are required for a variety of uses in both near-term fusion devices and in commercial powerplants. These materials must retain adequate structural and electrical properties under conditions of neutron, particle, and ionizing irradiation; thermal and applied stresses; and physical and chemical sputtering. Ceramics such as Al/sub 2/O/sub 3/, MgAl/sub 2/O/sub 4/, BeO, Si/sub 3/N/sub 4/ and SiC are currently under study for fusion applications, and results to date show widely-varying response to the fusion environment. Materials can be identified today which will meet initial operating requirements, but improvements in physical properties are needed to achieve satisfactory lifetimes for critical applications.

Clinard, F.W. Jr.

1986-01-01

345

Fusion Reactor Control  

NASA Astrophysics Data System (ADS)

The plasma kinetic temperature and density changes, each per an injected fuel density rate increment, control the energy supplied by a thermonuclear fusion reactor in a power production cycle. This could include simultaneously coupled control objectives for plasma current, horizontal and vertical position, shape and burn control. The minimum number of measurements required, use of indirect (not plasma parameters) system measurements, and distributed control procedures for burn control are to be verifiable in a time dependent systems code. The International Thermonuclear Experimental Reactor (ITER) has the need to feedback control both the fusion output power and the driven plasma current, while avoiding damage to diverter plates. The system engineering of fusion reactors must be performed to assure their development expeditiously and effectively by considering reliability, availability, maintainability, environmental impact, health and safety, and cost.

Plummer, Dirk

2003-10-01

346

An Internet-Based Telerehabilitation System for the Assessment of Motor Speech Disorders: A Pilot Study  

ERIC Educational Resources Information Center

Purpose: This pilot study explored the feasibility and effectiveness of an Internet-based telerehabilitation application for the assessment of motor speech disorders in adults with acquired neurological impairment. Method: Using a counterbalanced, repeated measures research design, 2 speech-language pathologists assessed 19 speakers with…

Hill, Anne J.; Theodoros, Deborah G.; Russell, Trevor G.; Cahill, Louise M.; Ward, Elizabeth C.; Clark, Kathy M.

2006-01-01

347

Motor Coordination Dynamics Underlying Graphic Motion in 7- to 11-Year-Old Children  

ERIC Educational Resources Information Center

|Using concepts and tools of a dynamical system approach in order to understand motor coordination underlying graphomotor skills, the aim of the current study was to establish whether the basic coordination dynamics found in adults is already established in children at elementary school, when handwriting is trained and eventually acquired. In the…

Danna, Jeremy; Enderli, Fabienne; Athenes, Sylvie; Zanone, Pier-Giorgio

2012-01-01

348

An Extended Motor Network Generates Beta and Gamma Oscillatory Perturbations during Development  

ERIC Educational Resources Information Center

This study examines the time course and neural generators of oscillatory beta and gamma motor responses in typically-developing children. Participants completed a unilateral flexion-extension task using each index finger as whole-head magnetoencephalography (MEG) data were acquired. These MEG data were imaged in the frequency-domain using spatial…

Wilson, Tony W.; Slason, Erin; Asherin, Ryan; Kronberg, Eugene; Reite, Martin L.; Teale, Peter D.; Rojas, Donald C.

2010-01-01

349

Primer: cognitive motor learning for teaching surgical skill—how are surgical skills taught and assessed?  

Microsoft Academic Search

As the practice of surgery evolves, the modalities by which future surgeons are trained must also develop. Traditionally, surgical trainees have learned through a mentorship model, with the majority of cognitive motor learning for surgical skill being initiated and practiced within the operating room. This, however, is no longer the ideal environment in which to acquire surgical skills and, subsequently,

Jaime A Wong; Edward D Matsumoto

2008-01-01

350

Iris image acquirement and preprocessing in biometrics  

NASA Astrophysics Data System (ADS)

As a biometrics, iris recognition is becoming an active topic in recent years. Due to constriction and dilation of iris sphincter muscle affected by illumination, iris images should be captured under steady illumination. The principles of our homemade iris capture device and real product are introduced first. This device can be used to capture fine iris images and store them into the computer. Due to changes of head orientation and binocular vergence at different iris acquirement time, a preprocessing method including iris location, normalization, image enhancement and rotation correction is then applied to achieve rotation, shift and scale invariance. Finally the correlation measurement is used to evaluate the performance of this processing.

Ming, Xing; Li, Zhihui; Liu, Yuanning

2005-12-01

351

Energy efficient motors reference guide  

NASA Astrophysics Data System (ADS)

The motor reference guide is the result of data and information collected and organized by the Industrial and Large Commercial staff of the Tennessee Valley Authority. The information was collected over several months from motor manufacturers, technical papers, textbooks, and files of former TVA engineers. Additionally, computer simulations were performed to develop data not currently available in literature. The guide is not intended to be a textbook on motors, but a quick and ready reference for the TVA field staff to assist in the technical and economic evaluation of energy-efficient motors versus standard motors. However, chapters on motor related topics such as rotating fields, power factor correction, and impact of power quality on motor performances have also been included to complement the text.

Sadanandan, N. D.; Eltom, A. H.

1992-03-01

352

Intense fusion neutron sources  

SciTech Connect

The review describes physical principles underlying efficient production of free neutrons, up-to-date possibilities and prospects of creating fission and fusion neutron sources with intensities of 10{sup 15}-10{sup 21} neutrons/s, and schemes of production and application of neutrons in fusion-fission hybrid systems. The physical processes and parameters of high-temperature plasmas are considered at which optimal conditions for producing the largest number of fusion neutrons in systems with magnetic and inertial plasma confinement are achieved. The proposed plasma methods for neutron production are compared with other methods based on fusion reactions in nonplasma media, fission reactions, spallation, and muon catalysis. At present, intense neutron fluxes are mainly used in nanotechnology, biotechnology, material science, and military and fundamental research. In the near future (10-20 years), it will be possible to apply high-power neutron sources in fusion-fission hybrid systems for producing hydrogen, electric power, and technological heat, as well as for manufacturing synthetic nuclear fuel and closing the nuclear fuel cycle. Neutron sources with intensities approaching 10{sup 20} neutrons/s may radically change the structure of power industry and considerably influence the fundamental and applied science and innovation technologies. Along with utilizing the energy produced in fusion reactions, the achievement of such high neutron intensities may stimulate wide application of subcritical fast nuclear reactors controlled by neutron sources. Superpower neutron sources will allow one to solve many problems of neutron diagnostics, monitor nano-and biological objects, and carry out radiation testing and modification of volumetric properties of materials at the industrial level. Such sources will considerably (up to 100 times) improve the accuracy of neutron physics experiments and will provide a better understanding of the structure of matter, including that of the neutron itself.

Kuteev, B. V. [Russian Research Centre Kurchatov Institute (Russian Federation); Goncharov, P. R.; Sergeev, V. Yu. [St. Petersburg State Polytechnic University (Russian Federation); Khripunov, V. I. [Russian Research Centre Kurchatov Institute (Russian Federation)

2010-04-15

353

Reinforcement learning of motor skills with policy gradients.  

PubMed

Autonomous learning is one of the hallmarks of human and animal behavior, and understanding the principles of learning will be crucial in order to achieve true autonomy in advanced machines like humanoid robots. In this paper, we examine learning of complex motor skills with human-like limbs. While supervised learning can offer useful tools for bootstrapping behavior, e.g., by learning from demonstration, it is only reinforcement learning that offers a general approach to the final trial-and-error improvement that is needed by each individual acquiring a skill. Neither neurobiological nor machine learning studies have, so far, offered compelling results on how reinforcement learning can be scaled to the high-dimensional continuous state and action spaces of humans or humanoids. Here, we combine two recent research developments on learning motor control in order to achieve this scaling. First, we interpret the idea of modular motor control by means of motor primitives as a suitable way to generate parameterized control policies for reinforcement learning. Second, we combine motor primitives with the theory of stochastic policy gradient learning, which currently seems to be the only feasible framework for reinforcement learning for humanoids. We evaluate different policy gradient methods with a focus on their applicability to parameterized motor primitives. We compare these algorithms in the context of motor primitive learning, and show that our most modern algorithm, the Episodic Natural Actor-Critic outperforms previous algorithms by at least an order of magnitude. We demonstrate the efficiency of this reinforcement learning method in the application of learning to hit a baseball with an anthropomorphic robot arm. PMID:18482830

Peters, Jan; Schaal, Stefan

2008-04-26

354

Fusion cross-sections for inertial fusion energy  

Microsoft Academic Search

The application of selective resonant tunneling model is extended from d 1 t fusion to other light nucleus fusion reactions, such as d 1 d fusion and d 1 3 He. In contrast to traditional formulas, the new formula for the cross-section needs only a few parameters to fit the experimental data in the energy range of interest. The features

XING ZHONG LI; BIN LIU; SI CHEN; QING MING WEI; HEINRICH HORA

2004-01-01

355

Fusion - High performance computing in magnetic fusion energy research  

Microsoft Academic Search

Obtaining energy from nuclear fusion requires heating the fuel to about 100 times the temperature of the sun to produce a plasma, and holding the hot plasma long enough for fusion reactions to produce a net energy gain. In a magnetic fusion device, this plasma is maintained in a largely self-organized state that far from equilibrium the mathematical description of

Donald B. Batchelor

2006-01-01

356

Buffer Energy Nuclear Fusion  

NASA Astrophysics Data System (ADS)

A compact scheme of non-thermonuclear fusion is presented. Hydrogen ions are implanted directly from nonthermal discharge plasma or ion source into a surface of liquid Li metal at a buffer energy of a few tens keV where nuclear stopping occurs. The ions interact with Li atoms or mixed element atoms which are not being internally excited and tend towards the formation of united atoms at the minimum Gibbs free energy point. This leads to the enhanced rate of non-thermonuclear fusion of hydrogen ions due to cohesion in the liquid metal.

Ikegami, Hidetsugu

2001-10-01

357

Fusion's $372-Million Mothball  

SciTech Connect

Lawrence Livermore National Laboratory's Mirror Fusion Test Facility (MFTF-B) was built to prove that a design using magnetic mirrors could compete in an international race to produce a commercial fusion reactor. The MFTF-B was to be used to propel the magnetic mirror program into a real contest against Livermore's arch rival: the Princeton Plasma Physics Laboratory and its tokamak machine. On 21 February 1986, after 9 years of construction and $372 million, MTFT-B was officially dedicated. However, due to budget restriction DOE demanded the facility be put on standby the very next day.

Booth, W.

1987-10-09

358

DD fusion in crystals  

SciTech Connect

The article discusses the mechanism of DD {sup {yields} 4}He fusion and so-called nonradiative thermalization of the reaction in crystals. The dynamics of this process is considered. The assumption that the decay time of the compound nucleus depends on its excitation energy makes experiments in crystals compatible with the acceleration data.We consider the processes in the crystals that increase the intensity ofDD fusion in comparison to the amorphous media, and the yield of the reaction is estimated.

Tsyganov, E. N. [University of Texas Southwestern Medical Center at Dallas (United States)

2010-12-15

359

Caviton-Induced Fusion  

NASA Astrophysics Data System (ADS)

A process of is described which utilizes a nonlinear state "Caviton"(2) to induce localized fusion. Cavitons are depleted-electron-density states created by localized enhanced oscillating fields. The large ambipolar potential results in the acceleration and trapping of D- to fuse with D+. Cavitons can be created efficiently because the enabling oscillating fields are enhanced by local plasma resonances and the frequency is in the microwave range. This process in a low-temperature plasma is described and compared with Muon catalyzed fusion. 2. Cavitons, A.Y. Wong, J. de Phys. Tome 38, Calloque C-6 (1977).

Wong, Alfred Y.

2001-10-01

360

Cell fusion by ionizing radiation.  

National Technical Information Service (NTIS)

The relevance and importance of cell fusion are illustrated by the notion that current interest in this phenomenon is shared by scientists in quite varied disciplines. The diversity of cellular membrane fusion phenomena could provoke one to think that the...

M. B. Khair

1993-01-01

361

Civilian Applications of Laser Fusion.  

National Technical Information Service (NTIS)

The commercial aspects of laser fusion were evaluated in an attempt to relate the end products (neutrons and energy) to significant commercial applications. We have found that by far the largest markets and highest payoffs for laser fusion are associated ...

J. Maniscalco J. Blink R. Buntzen J. Hovingh W. Meier

1978-01-01

362

Fusion technology status and requirements  

SciTech Connect

This paper summarizes the status of fusion technology and discusses the requirements to be met in order to build a demonstration fusion plant. Strategies and programmatic considerations in pursuing engineering feasibility are also outlined.

Thomassen, K.I.

1982-01-26

363

Dynamically timed electric motor  

NASA Astrophysics Data System (ADS)

The invention disclosed in this document is a brushless DC motor including a housing having an end cap secured thereto. The housing encloses a rotor, a stator and a rotationally displaceable commutation board having 5 sensors secured thereon and spaced around the periphery of the rotor. An external rotational force is applied to the commutation board for displacement of the sensors to various positions whereby varying feedback signals are generated by the positioning of the sensors relative to the rotating rotor. The commutation board is secured in a fixed position in response to feedback signals indicative of optimum sensor position being determined. The rotation of the commutation board and the securing of the sensors in the desired fixed position is accomplished without requiring the removal of the 5 end cap and with the DC motor operating.

Casper, Ann M.

1994-12-01

364

Rocket motor exhaust scrubber  

US Patent & Trademark Office Database

A wet scrubber having a series of chambers for capturing and cooling exhaust gases generated during static test firing of rocket motors. Exhaust gas enters an inlet to a first chamber and is cooled and slowed by a spray solution. HCL gas is condensed and absorbed by the spray solution and precipitates to a liquid slurry at the bottom of the device. The remaining exhaust products enter a demister chamber where nozzles continue to spray the gasses as they pass upward and through a mesh-style demister at the top of the vessel. The demister filters liquid and solid waste particles from the gas stream, and the clean, dry gases are accelerated through a centrifugal fan into the atmosphere. A deflector is positioned within the inlet to the first chamber for containing parts in the event of a motor mal-function.

Carns; Richard H. (Byantown, MD); Armstrong; Gerald (Hughesville, MD); Rast; Robert H. (Nanjemoy, MD); Mitchell; Dennis R. (Brooking, OR)

2005-11-15

365

Motorized dumping vehicle  

Microsoft Academic Search

A motorized dump-type vehicle is described for on-the-job transporting of concrete or other materials, comprising: (a) a rectangular metal formed chassis frame having integrally-joined side, front and rear members defining in transit front and rear ends thereof; (b) a gasoline engine mounted above and on the rear end of the frame; (c) an open top dump container having metal formed

1987-01-01

366

Hydraulic motor for cars  

SciTech Connect

A hydraulic motor for a car is described comprising, in combination, an automotive vehicle engine for travel self-propulsion, including a block, a plurality of cylinders in the block, a piston slidable in each cylinder, a crankshaft in the block, a piston rod connected between the crankshaft and each of the pistons, a power take-off gear on the crankshaft for the travel self-propulsion, and the engine including a hydraulic means for driving the pistons in the cylinders.

Gagnon, D.C.

1986-09-02

367

Motor neurone disease  

PubMed Central

Physiological and biochemical studies were carried out on 16 patients with motor neurone disease (MND). It was confirmed that the peripheral nerves in cases of MND are often unusually resistant to ischaemia especially as regards the large sensory fibres. Biochemical investigations demonstrated a tendency to carbohydrate intolerance and abnormal pyruvate metabolism. When compared with other related studies in MND it seems very likely that there is a metabolic abnormality present in MND which demands further study. Images

Shahani, Bhagwan; Davies-Jones, G. A. B.; Russell, W. Ritchie

1971-01-01

368

Motors and Movement  

Microsoft Academic Search

\\u000a Your 3D printer is now ready for the motors that will control movement and allow the Plastic Extruder to “print” on the tabletop.\\u000a There are three axes of movement: X, Y, and Z. The X-axis consists of the Table that will move forwards and backwards (front\\u000a to back), the Y-axis will move the Extruder left and right, and the Z-axis

Patrick Hood-Daniel; James Floyd Kelly

369

Clinicopathological correlation of acquired hyperpigmentary disorders.  

PubMed

Acquired pigmentary disorders are group of heterogenous entities that share single, most significant, clinical feature, that is, dyspigmentation. Asians and Indians, in particular, are mostly affected. Although the classic morphologies and common treatment options of these conditions have been reviewed in the global dermatology literature, the value of histpathological evaluation has not been thoroughly explored. The importance of accurate diagnosis is emphasized here as the underlying diseases have varying etiologies that need to be addressed in order to effectively treat the dyspigmentation. In this review, we describe and discuss the utility of histology in the diagnostic work of hyperpigmentary disorders, and how, in many cases, it can lead to targeted and more effective therapy. We focus on the most common acquired pigmentary disorders seen in Indian patients as well as a few uncommon diseases with distinctive histological traits. Facial melanoses, including mimickers of melasma, are thoroughly explored. These diseases include lichen planus pigmentosus, discoid lupus erythematosus, drug-induced melanoses, hyperpigmentation due to exogenous substances, acanthosis nigricans, and macular amyloidosis. PMID:23619441

Patel, Anisha B; Kubba, Raj; Kubba, Asha

370

Biomarkers in community-acquired pneumonia.  

PubMed

A relevant problem in the management of pulmonary infections is the low specificity of clinical symptoms for the exact diagnosis and the need of antibiotic therapy. An ideal biomarker for bacterial pulmonary infections should allow a rapid diagnosis, have a prognostic value and facilitate therapeutic decision making. The two biomarkers currently needed in clinical use are C-reactive protein and procalcitonin. C-reactive protein is very unspecific and elevated in bacterial as well as viral infections. Today, procalcitonin is the best validated biomarker for pulmonary infections. In several interventional studies procalcitonin-guided therapy has proven to allow a significant reduction of duration and frequency of antibiotic therapy. However, for the evaluation of prognosis in community-acquired pneumonia, new cardiovascular biomarkers are superior compared with inflammatory markers, especially for the determination of long-term mortality. The combination of several biomarkers reflecting different pathophysiological pathways has the potential to improve the management of community-acquired pneumonia in the future. PMID:22455492

Krüger, Stefan; Welte, Tobias

2012-04-01

371

Guidelines for acquiring and reporting clinical neurospectroscopy.  

PubMed

Since the advent of CPT 76390 in 1998, magnetic resonance spectroscopy (MRS) of the brain, or neurospectroscopy, has moved from the realm of academic research into that of the clinical world. All major MR manufacturers have aided in the endeavor by automating neurospectroscopy so that it no longer requires an MR physicist and is a push-button technique that can be run by technologists just as a typical MR sequence. Thousands of studies have demonstrated the clinical efficacy of neurospectroscopy, and there are many medical reviews of how this technique can be applied across a wide range of neurologic disorders. However, few studies address the practical issue of acquiring and reporting neurospectroscopy in a clinical practice. Based on clinical experience at three different sites across the country and nearly two decades of applications training for technologists and radiologists at international clinical neurospectroscopy courses, the guidelines described in this article demonstrate proven protocols for clinical diagnosis and outline the strategies involved in acquiring, interpreting, and reporting clinical neurospectroscopy successfully. A standard operating procedure used across the three sites is described and high reproducibility across different platforms is shown. PMID:23361487

Lin, Alexander; Tran, Thao; Bluml, Stefan; Merugumala, Sai; Liao, Hui-Jun; Ross, Brian D

2013-01-29

372

Fusion of Doppler Radar and video information for automated traffic surveillance  

Microsoft Academic Search

Current Doppler radar speed measurement systems lack the ability to distinguish multiple targets within the microwave beamwidth. In this paper, a traffic surveillance system is presented that is capable of automatically monitoring vehicle speeds on roadways using sensor fusion on data acquired from a calibrated video camera and a continuous wave Doppler radar. The time-frequency resolution of the radar signal

Arunesh Roy; Nicholas Gale; Lang Hong

2009-01-01

373

Automated traffic surveillance using fusion of Doppler radar and video information  

Microsoft Academic Search

Current Continuous Wave (CW) Doppler radar speed measurement systems lack the ability to distinguish multiple targets. Most systems can only identify the strongest (closest) target or the fastest target. In this paper, a traffic surveillance system is presented that is capable of automatically monitoring all vehicle speeds on roadways using sensor fusion on data acquired from a video camera and

Arunesh Roy; Nicholas Gale; Lang Hong

2011-01-01

374

Intelligence image fusion recognition algorithm based on Dempster-Shafer evidence reasoning  

Microsoft Academic Search

Three dimension object recognition is a basic problem of computer vision field. There were uncertainness, uncompleteness and unclarity in acquirement data as invariant moment theory was applied to recognize three dimension image target, therefore recognition efficiency could not meet the needs of actual system. By combining Dempster-Shafer evidence reasoning with invariant moment theory, intelligence image fusion recognition algorithm was present.

Yongmei Cheng; Quan Pan I; Hongcai Zhang; Gang Wang

2004-01-01

375

25 CFR 211.8 - Government employees cannot acquire leases.  

Code of Federal Regulations, 2013 CFR

...2013-04-01 false Government employees cannot acquire leases. 211...OF TRIBAL LANDS FOR MINERAL DEVELOPMENT General § 211.8 Government employees cannot acquire leases. U.S. Government employees are prevented from...

2013-04-01

376

25 CFR 212.8 - Government employees cannot acquire leases.  

Code of Federal Regulations, 2011 CFR

...2011-04-01 false Government employees cannot acquire leases. 212...OF ALLOTTED LANDS FOR MINERAL DEVELOPMENT General § 212.8 Government employees cannot acquire leases. U.S. Government employees are prevented from...

2011-04-01

377

25 CFR 212.8 - Government employees cannot acquire leases.  

Code of Federal Regulations, 2013 CFR

...2013-04-01 false Government employees cannot acquire leases. 212...OF ALLOTTED LANDS FOR MINERAL DEVELOPMENT General § 212.8 Government employees cannot acquire leases. U.S. Government employees are prevented from...

2013-04-01

378

25 CFR 211.8 - Government employees cannot acquire leases.  

Code of Federal Regulations, 2011 CFR

...2011-04-01 false Government employees cannot acquire leases. 211...OF TRIBAL LANDS FOR MINERAL DEVELOPMENT General § 211.8 Government employees cannot acquire leases. U.S. Government employees are prevented from...

2011-04-01

379

Laboratory-acquired meningococcemia--California and Massachusetts.  

PubMed

Although Neisseria meningitidis is commonly isolated in clinical laboratories, laboratory-acquired infection is rare (1). This report describes two fatal cases of meningococcal infection in laboratory workers; both of these cases probably were laboratory acquired. PMID:1898759

1991-01-25

380

Fusion reactors as a future energy source  

Microsoft Academic Search

A detailed update of fusion research concepts is given. Discussions are given for the following areas: (1) the magnetic confinement principle, (2) UWMAK I: conceptual design for a fusion reactor, (3) the inertial confinement principle, (4) the laser fusion power plant, (5) electron-induced fusion, (6) the long-term development potential of fusion reactors, (7) the symbiosis between fusion and fission reactors,

W. Seifritz

1975-01-01

381

U. S. Fusion Energy Future  

Microsoft Academic Search

Fusion implementation scenarios for the US have been developed. The dependence of these scenarios on both the fusion development and implementation paths has been assessed. A range of implementation paths has been studied. The deployment of CANDU fission reactors in Canada and the deployment of fission reactors in France have been assessed as possible models for US fusion deployment. The

John A. Schmidt; Dan Jassby; Scott Larson; Maria Pueyo; Paul H. Rutherford

2000-01-01

382

Cryogenic engineering and fusion power  

Microsoft Academic Search

In order to reduce the consumption of power for the magnets of a fusion power plant to acceptable proportions, it is necessary that fusion reactors must use either cryogenically cooled or superconducting coils. The cryogenic aspects of reactor design are discussed. It is found that the most difficult cryogenic engineering problems of fusion reactors are mainly those caused by the

C. E. Taylor

1974-01-01

383

Prospects for Tokamak Fusion Reactors.  

National Technical Information Service (NTIS)

This paper first reviews briefly the status and plans for research in magnetic fusion energy and discusses the prospects for the tokamak magnetic configuration to be the basis for a fusion power plant. Good progress has been made in achieving fusion react...

J. Sheffield J. Galambos

1995-01-01

384

World progress toward fusion energy  

Microsoft Academic Search

Magnetic confinement research has demonstrated the ability to produce controlled thermonuclear fusion conditions in the laboratory. As a result, fusion research is turning from the question of scientific feasibility to the question of engineering feasibility. The author summarizes the rapid progress that has been made in fusion science and technology, as well as what remains to be done. She emphasizes

N. A. Davies

1989-01-01

385

Fusion Research at the Crossroads  

Microsoft Academic Search

On 10 December 1993 the Tokamak Fusion Test Reactor (TFTR) at the Princetone Plasma Physics Laboratory generated 6 million watts, a world record for the amount of power produced by a fusion reactor. The achievement was heralded as proof of fusion's potential as a virtually inexhaustible supply of electrical energy. Sometime in late 1994 or early 1995 the 43-year-old lab

Christopher Anderson

1994-01-01

386

Physics (selected articles). [Nuclear fusion  

SciTech Connect

Controlled nuclear fusion as a new energy source was investigated. It will be possible in the 1980's to obtain thermal nuclear ignition, and in the early 2000's nuclear fusion may be used to supplement the energy shortage. It is predicted that in the 2000's nuclear fusion will occupy an important position as a global source of energy.

Shiyao, Z.; Zesheng, C.; Xiaolung, X.; Qiang, H.

1982-09-01

387

Strategy toward inertial fusion energy  

Microsoft Academic Search

The understanding of implosion physics and the progress of relevant technologies for inertial fusion has led us to a new phase of inertial fusion research: the initiation of the construction of ignition-capable laser facilities (the US National Ignition Facility and the French Megajoule Project). This also led us to consider a new phase for Inertial Fusion Energy (IFE) research, to

S Nakai; B. G Logan

1999-01-01

388

IMM architecture for track fusion  

Microsoft Academic Search

A numeric solution for the fusion of multiple tracks produced form an arbitrary number of asynchronous measurements has been recently developed. This track fusion solution is a weighted sum of the values associated with the previous fused estimate and the multiple individual estimates. This optimal asynchronous track fusion algorithm (OATFA) has properties that are identical to the Kalman filter. However,

Gregory A. Watson; Theodore R. Rice; Ali T. Alouani

2000-01-01

389

Fusion reactor radioactive waste management  

Microsoft Academic Search

Quantities and compositions of non-tritium radioactive waste are estimated for some current conceptual fusion reactor designs, and disposal of large amounts of radioactive waste appears necessary. Although the initial radioactivity of fusion reactor and fission reactor wastes are comparable, the radionuclides in fusion reactor wastes are less hazardous and have shorter half-lives. Areas requiring further research are discussed.

J. D. Kaser; A. K. Postma; D. J. Bradley

1976-01-01

390

Motor protecting improved energy economizer for induction motors  

SciTech Connect

A standard, unmodified AC induction motor has its stator winding energized from a sine wave source through a signal-responsive wave modifier operative to control the portion of each cycle of the sine wave which is coupled from said source to the stator winding. An improved motor current demodulator, responsive to efficiency-related parameters and excessive stator winding inrush current each time said current increases from zero, produces signals for controlling the wave modifier, thereby to maintain optimum motor efficiency with varying motor loads and power source variations, and the signals also control a motor protector circuit which inhibits said wave modifier thereby to deenergize said stator winding under excessive input current conditions, excessive motor temperature or a potentially damaging combination thereof.

Hedges, R.W.

1983-11-08

391

Role of BDNF in Central Motor Structures and Motor Diseases.  

PubMed

Brain-derived neurotrophic factor (BDNF), belonging to the neurotrophic family of growth factors, has a widespread distribution in the central and peripheral nervous systems. In central motor structures including the motor cortex, cerebellum, basal ganglia, and spinal cord, BDNF exerts both neurotrophic and direct electrophysiological effects via a high-affinity tyrosine receptor kinase B receptor and a common low-affinity p75 neurotrophin receptor. The underlying signaling pathways mainly involve mitogen-activated protein kinase cascades, phosphatidylinositol 3-kinase pathway, and phospholipase C-? pathway. The loss of BDNF usually leads to neurodegeneration in these motor centers and eventually results in several severe motor diseases, such as amyotrophic lateral sclerosis, spinocerebellar ataxias, Parkinson's disease, Huntington's disease, as well as vestibular syndrome. In this review, we summarize the recent understanding of functions of BDNF in motor structures and suggest that BDNF may be a potent candidate for the treatment of these neurodegenerative motor diseases. PMID:23649659

He, Yan-Yan; Zhang, Xiao-Yang; Yung, Wing-Ho; Zhu, Jing-Ning; Wang, Jian-Jun

2013-05-01

392

Status of inertial fusion  

NASA Astrophysics Data System (ADS)

The technology advancement to high-power beams has also given birth to new technologies. That class of Free Electron Lasers that employs RF linacs, synchrotrons, and storage rings - although the use of the tools of High Energy Physics (HEP) - was developed well behind the kinetic energy frontier. The induction linac, however, is something of an exception; it was born directly from the needs of the magnetic fusion program, and was not motivated by a high-energy physics application. The heavy-ion approach to inertial fusion starts with picking from the rich menu of accelerator technologies those that have, ab initio, the essential ingredients needed for a power plant driver: multigap acceleration - which leads to reliability/lifetime; electrical efficiency; repetition rate; and beams that can be reliably focused over a suitably long distance. The report describes the programs underway in Heavy Ion Fusion Accelerator Research as well as listing expected advances in driver, target, and beam quality areas in the inertial fusion power program.

Keefe, D.

1987-04-01

393

Fusion processor simulation (FPSim)  

Microsoft Academic Search

The Fusion Processor Simulation (FPSim) is being developed by Rome Laboratory to support the Discrimination Interceptor Technology (DITP) and Advanced Sensor Technology (ASTP) Programs of the Ballistic Missile Defense Organization. The purpose of the FPSim is to serve as a test bed and evaluation tool for establishing the feasibility of achieving threat engagement timelines. The FPSim supports the integration, evaluation,

Mark D. Barnell; Douglas G. Wynne; Brian J. Rahn

1998-01-01

394

Fusion Power Demonstration III.  

National Technical Information Service (NTIS)

This is the third in the series of reports covering the Fusion Power Demonstration (FPD) design study. This volume considers the FPD-III configuration that incorporates an octopole end plug. As compared with the quadrupole end-plugged designs of FPD-I and...

J. D. Lee

1985-01-01

395

Cell Fusion Hybrids.  

National Technical Information Service (NTIS)

Cell fusion hybrids were obtained by fusing protoplasts of Nicotiana glauca and N. langsdorffii in the presence of polyethylene glycol. The hybrid protoplasts were selected out of a mixed population by growing on a culture medium that does not support the...

H. H. Smith

1976-01-01

396

Fusion of Bacterial Protoplasts  

Microsoft Academic Search

Prototrophic Bacillus subtilis cells can be formed in the presence of DNase as a result of cell fusion occurring in mixed populations of protoplasts derived from two parental strains which are both nutritionally-complementing and polyauxotrophic. No prototrophs ever appear from mixed nonprotoplasted bacteria, or from the auxotrophic parental protoplasts plated separately. The frequency of prototroph formation, which is appreciable only

Pierre Schaeffer; Brigitte Cami; Rollin D. Hotchkiss

1976-01-01

397

Progress in Laser Fusion  

Microsoft Academic Search

Operation of four of the worlds largest laser systems, and lines of investigation opened up by the systems, make it possible to be guardedly optimistic about the scientific feasibility of demonstrating laser fusion within the next 10 years. Major advances in tow disciplines are primarily responsible for this optimism. In optics a phenomenon called harmonic-frequency conversion has been exploited to

R. Stephen Craxton; Robert L. McCrory; John M. Soures

1986-01-01

398

Laser-driven fusion  

Microsoft Academic Search

The use of intense laser light to bring about thermonuclear reactions in a plasma is of considerable current interest. We present detailed analytical and computational studies which show the feasibility of laser-driven fusion. The required laser technology and the presently anticipated practical difficulties are discussed in outline.

Keith A. Brueckner; Siebe Jorna

1974-01-01

399

Inertial fusion program  

NASA Astrophysics Data System (ADS)

Progress in the development of high energy short pulse CO2 laser systems for fusion research is reported. Improvements to a two-beam system, Gemini, are outlined and experimental results discussed. An eight-beam system, Helios, was fired successfully on target for the first time, and became the world's most powerful gas laser for laser fusion studies. Work on Antares, a 100 to 200 TW target irradiation system, is summarized. A baseline design for automatic centering of laser beams onto the various relay mirrors and the optical design of the Antares front end are discussed. The results of various fusion reactor studies are summarized, as well as investigations of synthetic-fuel production through application of fusion energy to hydrogen production by thermochemical water splitting. Studies on increased efficiency of energy extraction in CO2 lasers and on lifetimes of cryogenic pellets in a reactor environment are summarized, as well as the results of studies on pellet injection, tracking, and beam synchronization.

Perkins, R. B.; Skoberne, F.

1980-11-01

400

Fusion of conformal interfaces  

Microsoft Academic Search

We study the fusion of conformal interfaces in the c = 1 conformal field theory. We uncover an elegant structure reminiscent of that of black holes in supersymmetric theories. The role of the BPS black holes is played by topological interfaces, which (a) minimize the entropy function, (b) fix through an attractor mechanism one or both of the bulk radii,

C. Bachas; I. Brunner

2008-01-01

401

Cell fusion and plasticity  

Microsoft Academic Search

Cell plasticity is a central issue in stem cell biology. In many recent discussions, observation of cell fusion has been seen\\u000a as a confounding factor which calls into question published results concerning cell plasticity of, particularly, adult stem\\u000a cells. An examination of the voluminous literature of \\

Joseph J. Lucas; Naohiro Terada

2003-01-01

402

Fusion reactor materials  

NASA Astrophysics Data System (ADS)

This paper discuses the following topics on fusion reactor materials: irradiation, facilities, test matrices, and experimental methods; dosimetry, damage parameters, and activation calculations; materials engineering and design requirements; fundamental mechanical behavior; radiation effects; development of structural alloys; solid breeding materials; and ceramics.

403

Status of inertial fusion  

SciTech Connect

The technology advancement to high-power beams has also given birth to new technologies. That class of Free Electron Lasers that employs rf linacs, synchrotrons, and storage rings - although the use the tools of High Energy Physics (HEP) - was developed well behind the kinetic energy frontier. The induction linac, however, is something of an exception; it was born directly from the needs of the magnetic fusion program, and was not motivated by a high-energy physics application. The heavy-ion approach to inertial fusion starts with picking from the rich menu of accelerator technologies those that have, ab initio, the essential ingredients needed for a power plant driver: multigap acceleration - which leads to reliability/lifetime; electrical efficiency; repetition rate; and beams that can be reliably focused over a suitably long distance. The report describes the programs underway in Heavy Ion Fusion Accelerator Research as well as listing expected advances in driver, target, and beam quality areas in the inertial fusion power program.

Keefe, D.

1987-04-01

404

Compact fusion reactors  

SciTech Connect

Compact, high-power-density approaches to fusion power are proposed to improve economic viability through the use of less-advanced technology in systems of considerably reduced scale. The rationale for and the means by which these systems can be achieved are discussed, as are unique technological problems.

Krakowski, R.A.; Hagenson, R.L.

1983-01-01

405

Adaptive sensor fusion  

Microsoft Academic Search

A perceptual reasoning system adaptively extracting, associating, and fusing information from multiple sources, at various levels of abstraction, is considered as the building block for the next generation of surveillance systems. A system architecture is presented which makes use of both centralized and distributed predetection fusion combined with intelligent monitor and control coupling both on-platform and off-board track and decision

Ivan Kadar

1995-01-01

406

Soldier systems sensor fusion  

Microsoft Academic Search

This paper addresses sensor fusion and its applications in emerging Soldier Systems integration and the unique challenges associated with the human platform. Technology that,provides the highest operational payoff in a lightweight warrior system must not only have enhanced capabilities, but have low power components resulting in order of magnitude reductions coupled with significant cost reductions. These reductions in power and

Kathryne M. Brubaker

1998-01-01

407

Motor Simulation without Motor Expertise: Enhanced Corticospinal Excitability in Visually Experienced Dance Spectators  

PubMed Central

The human “mirror-system” is suggested to play a crucial role in action observation and execution, and is characterized by activity in the premotor and parietal cortices during the passive observation of movements. The previous motor experience of the observer has been shown to enhance the activity in this network. Yet visual experience could also have a determinant influence when watching more complex actions, as in dance performances. Here we tested the impact visual experience has on motor simulation when watching dance, by measuring changes in corticospinal excitability. We also tested the effects of empathic abilities. To fully match the participants' long-term visual experience with the present experimental setting, we used three live solo dance performances: ballet, Indian dance, and non-dance. Participants were either frequent dance spectators of ballet or Indian dance, or “novices” who never watched dance. None of the spectators had been physically trained in these dance styles. Transcranial magnetic stimulation was used to measure corticospinal excitability by means of motor-evoked potentials (MEPs) in both the hand and the arm, because the hand is specifically used in Indian dance and the arm is frequently engaged in ballet dance movements. We observed that frequent ballet spectators showed larger MEP amplitudes in the arm muscles when watching ballet compared to when they watched other performances. We also found that the higher Indian dance spectators scored on the fantasy subscale of the Interpersonal Reactivity Index, the larger their MEPs were in the arms when watching Indian dance. Our results show that even without physical training, corticospinal excitability can be enhanced as a function of either visual experience or the tendency to imaginatively transpose oneself into fictional characters. We suggest that spectators covertly simulate the movements for which they have acquired visual experience, and that empathic abilities heighten motor resonance during dance observation.

Jola, Corinne; Abedian-Amiri, Ali; Kuppuswamy, Annapoorna; Pollick, Frank E.; Grosbras, Marie-Helene

2012-01-01

408

Comparison of capabilities of reluctance synchronous motor and induction motor  

NASA Astrophysics Data System (ADS)

This paper compares the capabilities of a reluctance synchronous motor (RSM) with those of an induction motor (IM). An RSM and IM were designed and made, with the same rated power and speed. They differ only in the rotor portion while their stators, housings and cooling systems are identical. The capabilities of both motors in a variable speed drive are evaluated by comparison of the results obtained by magnetically nonlinear models and by measurements.

Štumberger, Gorazd; Hadžiselimovi?, Miralem; Štumberger, Bojan; Miljavec, Damijan; Dolinar, Drago; Zagradišnik, Ivan

2006-09-01

409

Preschoolers Acquire General Knowledge by Sharing in Pretense  

ERIC Educational Resources Information Center

|Children acquire general knowledge about many kinds of things, but there are few known means by which this knowledge is acquired. In this article, it is proposed that children acquire generic knowledge by sharing in pretend play. In Experiment 1, twenty-two 3- to 4-year-olds watched pretense in which a puppet represented a "nerp" (an unfamiliar…

Sutherland, Shelbie L.; Friedman, Ori

2012-01-01

410

Preschoolers Acquire General Knowledge by Sharing in Pretense  

ERIC Educational Resources Information Center

Children acquire general knowledge about many kinds of things, but there are few known means by which this knowledge is acquired. In this article, it is proposed that children acquire generic knowledge by sharing in pretend play. In Experiment 1, twenty-two 3- to 4-year-olds watched pretense in which a puppet represented a "nerp" (an unfamiliar…

Sutherland, Shelbie L.; Friedman, Ori

2012-01-01

411

Nonvisual motor learning improves visual motion perception: evidence from violating the two-thirds power law.  

PubMed

Few studies have reported direct effects of motor learning on visual perception, especially when using novel movements for the motor system. Atypical motor behaviors that violate movement constraints provide an excellent opportunity to study action-to-perception transfer. In our study, we passively trained blindfolded participants on movements violating the 2/3 power law. Before and after motor training, participants performed a visual discrimination task in which they decided whether two consecutive movements were same or different. For motor training, we randomly assigned the participants to two motor training groups or a control group. The motor training group experienced either a weak or a strong elliptic velocity profile on a circular trajectory that matched one of the visual test stimuli. The control group was presented with linear trajectories unrelated to the viewed movements. After each training session, participants actively reproduced the movement to assess motor learning. The group trained on the strong elliptic velocity profile reproduced movements with increasing elliptic velocity profiles while circular geometry remained constant. Furthermore, both training groups improved in visual discrimination ability for the learned movement as well as for highly similar movements. Participants in the control group, however, did not show any improvements in the visual discrimination task nor did participants who did not acquire the trained movement. The present results provide evidence for a transfer from action to perception which generalizes to highly related movements and depends on the success of motor learning. Moreover, under specific conditions, it seems to be possible to acquire movements deviating from the 2/3 power law. PMID:20610788

Beets, I A M; Rösler, F; Fiehler, K

2010-07-07

412

Usefulness of magnetic motor evoked potentials in the surgical treatment of hemiplegic patients with intractable epilepsy.  

PubMed

Five hemiplegic patients with intractable epilepsy were studied with transcranial magnetic stimulation (TMS) before and after various surgical treatments. These patients had unilateral widespread cerebral lesions acquired at various times, including congenital, infantile and childhood injury. Motor evoked potentials (MEPs) of the abductor pollicis brevis (APB) muscles were simultaneously recorded on both sides following TMS of the motor cortex in the respective hemisphere using a figure-8 or circular coil. In all patients with congenital disease, the abolition of motor function in the affected hemisphere was estimated by magnetic MEPs, and the hemiplegia did not deteriorate after functional hemispherectomy (HS) was performed in two of them. In two patients with acquired disease, HS was not performed because it was shown by magnetic maps that the motor function in the affected hemisphere remained. Furthermore, it was shown by electric MEPs using subdural electrodes that a patient who had had encephalitis in early childhood had a reorganised motor area in the parietal cortex of the affected hemisphere. The present findings indicate that magnetic MEPs are a very useful non-invasive method of assessing whether the motor area in the affected hemisphere can be resected in hemiplegic patients with intractable epilepsy. PMID:12915083

Kamida, Tohru; Baba, Hiroshi; Ono, Kenji; Yonekura, Masato; Fujiki, Minoru; Kobayashi, Hidenori

2003-09-01

413

Acquired limb deficiencies. 1. Acquired Limb deficiencies in children and young adults  

Microsoft Academic Search

This self-directed learning module highlights prosthetic treatment considerations and challenges in children and young adults. It is part of the chapter on acquired limb deficiencies in the Self-Directed Physiatrie Education Program for practitioners and trainees in physical medicine and rehabilitation. This article specifically focuses on prosthetic considerations for a child experiencing a mutilating traumatic amputation, examines the rationale for limb

Phillip R. Bryant; Geetha Pandian

2001-01-01

414

Directions for improved fusion reactors  

SciTech Connect

Conceptual fusion reactor studies over the past 10 to 15 years have projected systems that may be too large, complex, and costly to be of commercial interest. One main direction for improved fusion reactors points towards smaller, higher-power-density approaches. First-order economic issues (i.e., unit direct cost and cost of electricity) are used to support the need for more compact fusion reactors. A generic fusion physics/engineering/costing model is used to provide a quantiative basis for these arguments for specific fusion concepts.

Krakowski, R.A.; Miller, R.L.; Delene, J.G.

1986-01-01

415

Accelerators for heavy ion fusion  

SciTech Connect

Large fusion devices will almost certainly produce net energy. However, a successful commercial fusion energy system must also satisfy important engineering and economic constraints. Inertial confinement fusion power plants driven by multi-stage, heavy-ion accelerators appear capable of meeting these constraints. The reasons behind this promising outlook for heavy-ion fusion are given in this report. This report is based on the transcript of a talk presented at the Symposium on Lasers and Particle Beams for Fusion and Strategic Defense at the University of Rochester on April 17-19, 1985.

Bangerter, R.O.

1985-10-01

416

THE IMMUNOLOGICAL BASIS OF ACQUIRED CELLULAR RESISTANCE  

PubMed Central

The resistance developed by mice during infection with Listeria monocytogenes, Brucella abortus, or Mycobacterium tuberculosis is not specifically directed against the infecting organism. The processes involved in the induction of acquired resistance, however, are highly specific and seem to depend upon two factors: a state of immunological reactivity of the host and the presence of the specific microbial antigens to which the host has become reactive. When these two coexist in the tissues the host is found to be non-specifically resistant. It is suggested that resistance, which was shown to depend upon an altered state of host macrophages, may be due to the interaction of antigen and a specific antibody adsorbed to the surface of host macrophages; and that the antibody involved in the reaction is perhaps identical with the antibody which confers the state of delayed-type hypersensitivity. The results are discussed in relation to the question of latent infection and infection immunity.

Mackaness, G. B.

1964-01-01

417

[Merits of acquiring ISO15189 accreditation].  

PubMed

In Japan, an ISO15189 accreditation system was started in 2005. To date, 47 hospitals have been accredited. In this session, I will present the merits of acquiring accreditation regarding ISO15189 based on our experience. Our hospital has 263 beds. The Clinical Examination Section consists of 12 staff (including 5 part-time workers): 7 in change of sample examination and 5 in charge of physiological examination. The annual number of samples is approximately 150,000. Samples collected on health checkups account for 90%. To improve the quality and service, assessment by third persons has been positively utilized in our hospital. Accreditation regarding ISO9001, ISO14001, ISO27001, privacy mark, hospital function assessment, the functional assessment of "ningen-dock"/health checkup hospitals, labor/hygiene service function assessment, and ISO15189 has been acquired. Patients may not recognize ISO. So, it must be utilized, considering that the acquisition of accreditation is not a goal but a starting point. Furthermore, cost-performance should be improved to achieve utilization-related merits. It is important to not only acquire accreditation but also help clinical staff and patients become aware of some changes/merits. Patients may consult a hospital for the following reasons: confidence in the hospital, and the staffs kind/polite attitudes. Long-term management strategies should be established without pursuing only short-term profits. I will introduce several merits of acquiring accreditation regarding ISO15189. Initially, incidental conditions for bids and appeal points include accreditation regarding ISO15189. Our corporation has participated in some competitive bids regarding health checkup business. In some companies, the bid conditions included ISO acquisition. In our hospital, clinical trials have been positively carried out. For participation in trials, hospitals must pass an institutional examination. However, ISO acquisition facilitates the preparation of documents, leading to successful results. The staffs consciousness has also change. I feel that they try to manage samples from blood collection until reporting laboratory data and interpret laboratory findings strictly. With ISO9001 and ISO14001 activities in our corporation, improvements in consciousness and service have increased the number of patients. Although items other than ISO also improved, ISO played an important role. We could participate in an international collaborative study, "Regional Difference in Laboratory Data and Establishment of Common Reference Ranges", which was mainly designed by Prof. Ichihara, Medical Research Department, Yamaguchi University Graduate School. This also resulted from ISO15189 acquisition. Furthermore, the Japanese Society of "Ningen-Dock" selected Dr. Yoshida, the chairman of the board of directors in our corporation, as a chairman of a meeting that will be held by this society in Asahikawa in 2010 as a result of ISO15189 acquisition by the Clinical Examination Section of our hospital, that is, high-level consciousness. It may be the first case for a middle-/small-scale general hospital to lead a meeting held by such a prestigious society. Thus, I have introduced the merits of ISO15189 acquisition. I hope that our experience will contribute to future ISO activities. PMID:20169948

Kitagawa, Masami

2010-01-01

418

Acquired immunodeficiency syndrome: Ga-67 citrate imaging  

SciTech Connect

All gallium-67 citrate scans obtained in patients with acquired immunodeficiency syndrome (AIDS) at the Clinical Center, National Institutes of Health (Bethesda, Md.) were retrospectively analyzed and correlated with the results of bronchoscopy, chest radiography, and endoscopy. There were 164 scans of 95 patients. Twenty scans were from patients with Pneumocystis carinii pneumonia; 19 were abnormal, for a sensitivity of 95%. Ga-67 uptake tended to be less in patients receiving therapy for P. carinii pneumonia. Chest radiographs were normal at least initially in three patients with abnormal scans and P. carinii pneumonia. Unusually prominent colonic activity was associated with infection in some patients. No lesions of Kaposi sarcoma showed tracer uptake. Gallium scanning is useful for detecting P. carinii pneumonia and other opportunistic infections in patients with AIDS, but it is not useful for localizing Kaposi sarcoma.

Woolfenden, J.M.; Carrasquillo, J.A.; Larson, S.M.; Simmons, J.T.; Masur, H.; Smith, P.D.; Shelhamer, J.H.; Ognibene, F.P.

1987-02-01

419

Blastomycosis acquired by three children in Toronto  

PubMed Central

Three paediatric cases of blastomycosis, apparently acquired in or near Toronto, Ontario, a region not known to be endemic for this disease, are described. Blastomycosis was not suspected clinically in any of the three cases, and the diagnosis was established only when the diagnostic net was broadened to include fungal and mycobacterial cultures. All three patients were diagnosed after significant delays, which is consistent with the rarity of the disease in children and its acquisition outside previously accepted geographical boundaries. Pulmonary involvement was present in all three children, while one also had multifocal osteomyelitis. Drug therapy was successful in all three cases, either with amphotericin B followed by itraconazole, or itraconazole alone. Blastomycosis should be included in the differential diagnosis of a patient from the Toronto area who presents with a compatible history despite a negative travel history to known endemic zones.

Bernstein, Stacey; Brunner, Hermine I; Summerbell, Richard; Allen, Upton; Babyn, Paul; Richardson, Susan E

2002-01-01

420

Acquired Epidermoid Cysts of the Cauda Equina  

PubMed Central

Intradural extramedullary epidermoid (EC) cysts are uncommon (0,2–1%). Acquired tumors appear more frequently as a late complication of lumbar punctures (40%). The authors present three cases of epidermoid cysts of the cauda equina which were surgically treated in their department during the past five years. All three had suffered lumbar punctures for rachianesthesia 6–9 years prior to their presentation. The patients' ages ranged between 19 and 31. Surgical treatment was deemed necessary because of the space–occupying nature of this slow–growing lesion, and this indication was supported by the MRI findings. Two–level laminectomy and microsurgical total tumor ablation were performed in all three cases. There were no postoperative complications.

Strambu, VED; Rosca, T; Cioti, D; Copaciu, R; Stroi, M; Ciurea, AV; Popa, F

2011-01-01

421

Acquired haemophilia A initially diagnosed as angioedema.  

PubMed

Acquired haemophilia (AH) is a bleeding diathesis caused by inhibitors to factor VIII. Patients developing AH may present with catastrophic bleeding episodes despite having no prior history of bleeding disorder. The authors report a patient with AH who presented with tongue swelling and was diagnosed with angioedema on presentation. However, the patient started bleeding spontaneously after presentation and was diagnosed with AH and the workup revealed haematoma of the tongue, which was the cause of tongue swelling. As previously reported in the literature, AH in this patient might have been precipitated secondary to exposure to an ear infection or exposure to the penicillin group of antibiotics. Laboratory examination was confirmatory for AH, which was appropriately treated with recombinant activated factor VIIa and immunosuppressive therapy with good outcomes. Understanding the pathophysiology of AH and appropriate management is important to prevent life-threatening bleeding. PMID:23921693

Demissie, Asmeret; Shahani, Lokesh; Khan, Aziz; Desai, Meghna

2013-08-06

422

Infantile and acquired nystagmus in childhood.  

PubMed

Nystagmus is an involuntary, periodic eye movement caused by a slow drift of fixation which is followed by a fast refixation saccade (jerk nystagmus) or a slow movement back to fixation (pendular nystagmus). In childhood most cases are benign forms of nystagmus: idiopathic infantile, ocular or latent nystagmus. They arise at the age of 3 months, without oscillopsia and show the absence of the physiologic opto-kinetic nystagmus. A full ophthalmologic evaluation is all that is needed in most cases: albinism, macular or optic nerve hypoplasia and congenital retinal dystrophies are the most common forms of ocular nystagmus. Idiopathic infantile nystagmus can be hereditary, the most common and best analyzed form being a mutation of the FRMD7 gene on chromosome Xq26.2. The mutation shows a mild genotype-phenotype correlation. In all female carriers the opto-kinetic nystagmus is absent and half had mild nystagmus. Latent nystagmus is part of the infantile esotropia syndrome and shows the unique feature of change of direction when the fixing eye changes: it is always beating to the side of the fixing eye. There is no cure for infantile nystagmus but therapeutic options include magnifying visual aids or eye muscle surgery at the age of 6-8 y in patients with head turn. Less than 20% of childhood nystagmus are acquired and need further neurological and imaging work-up. Alarming signs and symptoms are: onset after the age of 4 months, oscillopsia, dissociated (asymmetric) nystagmus, preserved opto-kinetic nystagmus, afferent pupillary defect, papilloedema and neurological symptoms like vertigo and nausea. The most common cause is due to pathology of the anterior optic pathway (e.g. optic nerve gliomas). It shows the same clinical feature of dissociated nystagmus as spasmus nutans but has a higher frequency as in INO. Other forms of acquired nystagmus are due to brainstem, cerebellar or metabolic diseases. PMID:22459007

Ehrt, Oliver

2012-03-28

423

Improved motors for utility applications  

NASA Astrophysics Data System (ADS)

The reliability and performance of powerhouse motors was evaluated and design and operational characteristics which, through advanced development, offer the potential of increased reliability, performance, and efficiency were identified. A data base of utility motor applications, operating factors, failures, causes of failures, and impacts of failures on the operation of the generating station was developed. A survey of 132 generating units was conducted and data on 4800 low and medium voltage motors with ratings greater than 100 hp was obtained. Results are presented relating motor failures to units, utilities, manufacturers, and applications. A separate survey was undertaken with the goal of documenting utility industry experience in using vacuum devices to switch motors in generating station auxiliaries systems. Eleven utilities were identified as having installations involving vacuum switching devices at 12 generating stations representing 122 motors.

Cornell, E. P.; Owen, E. L.; Appiarius, J. C.; McCoy, R. M.; Albrecht, P. F.; Houghtaling, D. W.

1982-10-01

424

Research on fusion neutron sources  

SciTech Connect

The use of fusion devices as powerful neutron sources has been discussed for decades. Whereas the successful route to a commercial fusion power reactor demands steady state stable operation combined with the high efficiency required to make electricity production economic, the alternative approach to advancing the use of fusion is free of many of complications connected with the requirements for economic power generation and uses the already achieved knowledge of Fusion physics and developed Fusion technologies. 'Fusion for Neutrons' (F4N), has now been re-visited, inspired by recent progress achieved on comparably compact fusion devices, based on the Spherical Tokamak (ST) concept. Freed from the requirement to produce much more electricity than used to drive it, a fusion neutron source could be efficiently used for many commercial applications, and also to support the goal of producing energy by nuclear power. The possibility to use a small or medium size ST as a powerful or intense steady-state fusion neutron source (FNS) is discussed in this paper in comparison with the use of traditional high aspect ratio tokamaks. An overview of various conceptual designs of compact fusion neutron sources based on the ST concept is given and they are compared with a recently proposed Super Compact Fusion Neutron Source (SCFNS), with major radius as low as 0.5 metres but still able to produce several MW of neutrons in a steady-state regime.

Gryaznevich, M. P. [Tokamak Solutions UK, Culham Science Centre, Abingdon, OXON, OX133DB (United Kingdom)

2012-06-19

425

Fusion research at the crossroads  

SciTech Connect

On 10 December 1993 the Tokamak Fusion Test Reactor (TFTR) at the Princetone Plasma Physics Laboratory generated 6 million watts, a world record for the amount of power produced by a fusion reactor. The achievement was heralded as proof of fusion's potential as a virtually inexhaustible supply of electrical energy. Sometime in late 1994 or early 1995 the 43-year-old lab will set another, less auspicious record: TFTR will be shut down, and the flagship lab in the U.S. fusion program will be left without an operating fusion experiment. This article examines DOE's fusion research program and shows that in the future Japan and Europe will dominate fusion research. The U.S. has only two operating reactors and may soon have only one. 2 figs.

Anderson, C.

1994-04-29

426

Newer lumbar interbody fusion techniques.  

PubMed

The purpose of this review is to update the reader on more recent, less invasive lumbar interbody fusion procedures. The article contains a brief history on the development of lumbar interbody fusion methods, as well as the indications and descriptions of the various open and minimally invasive procedures, their complications, and outcomes. In contrast to the more traditional open methods of performing anterior and posterior interbody fusions, surgeons doing the less invasive techniques of transforaminal lumbar interbody fusion, extreme lateral and direct lateral interbody fusion, and the presacral axial approach are reporting less morbidity, shorter hospital stays, high rates of fusion, and improved patient outcomes. Although each technique has a different anatomical plane of approach, the goal is to achieve a solid interbody fusion of the pain generating segment(s) without complications. PMID:23628562

Nasca, Richard J

2013-01-01

427

Motion control with induction motors  

Microsoft Academic Search

Induction motors (IM) provide a very wide speed range, mechanically robust and relatively low cost motion control option. An up-to-date summary of the status of induction motor motion control technology is the subject of this paper. The topics which this paper includes are as follows: basic motion control system requirements; field orientation instantaneous torque control principles for induction motors (FO-IM);

ROBERT D. LORENZ; THOMAS A. LIPO; DONALD W. NOVOTNY

1994-01-01

428

Toroidally wound brushless DC motor  

SciTech Connect

A high speed DC brushless motor in which the stator is toroidal and the stator core does not include winding slots. In the preferred embodiment the core material for the stator is an amorphous metal alloy which provides high speed motor efficiency. For some applications core materials like ferrite or low silicon-alloys can be used. According to one embodiment of the invention a ferrite shielding ring can be added surrounding the motor to further improve high speed efficiency.

Langley, L. W.; Fisher, R. L.

1985-10-15

429

Gas-operated motor systems  

Microsoft Academic Search

A gas-operated motor system of the stored energy type-as disclosed in U.S. Pat. No. 4,092,830-in which the gas exhausted from the motor is ducted to a chamber during operation of the motor and thereafter compressed back into the gas reservoir vessel. Recompression may be achieved, e.g., by providing the exhaust gas chamber with a movable piston, or by running the

Rilett

1980-01-01

430

Spine image fusion via graph cuts.  

PubMed

This study investigates a novel CT/MR spine image fusion algorithm based on graph cuts. This algorithm allows physicians to visually assess corresponding soft tissue and bony detail on a single image eliminating mental alignment and correlation needed when both CT and MR images are required for diagnosis. We state the problem as a discrete multilabel optimization of an energy functional that balances the contributions of three competing terms: (1) a squared error, which encourages the solution to be similar to the MR input, with a preference to strong MR edges; (2) a squared error, which encourages the solution to be similar to the CT input, with a preference to strong CT edges; and (3) a prior, which favors smooth solutions by encouraging neighboring pixels to have similar fused-image values. We further introduce a transparency-labeling formulation, which significantly reduces the computational load. The proposed graph-cut fusion guarantees nearly global solutions, while avoiding the pix elation artifacts that affect standard wavelet-based methods. We report several quantitative evaluations/comparisons over 40 pairs of CT/MR images acquired from 20 patients, which demonstrate a very competitive performance in comparisons to the existing methods. We further discuss various case studies, and give a representative sample of the results. PMID:23372071

Miles, Brandon; Ben Ayed, Ismail; Law, Max W K; Garvin, Greg; Fenster, Aaron; Li, Shuo

2013-01-29

431

Design of piezoelectric motor systems  

NASA Astrophysics Data System (ADS)

Designing, building, and testing piezoelectric motor systems are fundamental to the successful development and application of these relatively new components in practical devices. This dissertation describes the design, development, building, and testing of several unique motor systems along with the equipment and techniques for doing so. Designing original piezoelectric motors requires a fresh look at the existing selection of successful and unsuccessful motor systems. An extensive literature survey of piezoelectric motor systems over the past thirty years is provided as the first section of this work. Examining the construction geometry, the vibration and piezoelectric material orientation, and the output motion of these designs, new ideas as either variations on old designs or completely new and untested designs can be created. These ideas can be refined with analysis to develop a set of prototypes, which may be tested to compare their performance to the current art of piezoelectric motors. The design and testing of two new motor systems are described in detail in this work. Other problems associated with piezoelectric motor systems, including the measurement and calculation of the properties of piezoelectric materials; the calculation of their vibration characteristics, and problems with the analysis of piezoelectric motors form the final sections of this document.

Friend, James Robert

1998-12-01

432

46 CFR 169.684 - Overcurrent protection for motors and motor branch circuits.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 false Overcurrent protection for motors and motor branch...Gross Tons § 169.684 Overcurrent protection for motors and motor branch...be provided with running protection against overcurrent. A protective...

2012-10-01

433

Identification Of Synchronous Reluctance Motor Parameters  

Microsoft Academic Search

The detection of the neutral point voltage of three-phase synchronous reluctance motors is useful for obtaining information on the operating conditions of the motor and also on the Fourier coeficients of the air gap permeance. It is known that these parameters are crucial for the accurate evaluation of the motor’s main quantities. Modelling the motor so as to take into

N. Locci; I. Marongiu

1992-01-01

434

Development of Ulta-Efficient Electric Motors  

Microsoft Academic Search

Electric motors utilize a large amount of electrical energy in utility and industrial applications. Electric motors constructed with high temperature superconducting (HTS) materials have the potential to dramatically reduce electric motor size and losses. HTS motors are best suited for large motor applications at ratings above 1000 horsepower (hp), where the energy savings from the efficiency improvement can overcome the

B. Shoykhet; R. Schiferl; R. Duckworth; C. M. Rey; S. W. Schwenterly; M. J. Gouge

2008-01-01

435

Measuring motor imagery ability: A review  

Microsoft Academic Search

The internal nature of motor imagery makes the measurement of motor imagery ability a difficult task. In this review, we describe and evaluate existing measures of motor imagery ability. Following Jeannerod (1994, 1997) we define motor imagery in terms of imagined movement from the first person perspective. We describe how explicit motor imagery ability can be measured by questionnaire and

Laura P. McAvinue; Ian H. Robertson

2008-01-01

436

Fusion of concurrent single trial EEG data and fMRI data using multi-set canonical correlation analysis  

Microsoft Academic Search

We propose a data fusion method for the fusion of simultaneously acquired functional magnetic resonance imaging (fMRI) and single trial electroencephalography (EEG) data from multiple subjects using multi-set canonical correlation analysis (M-CCA). Our proposed technique utilizes the common time series information in the multimodal datasets to find trial-to-trial covariations across modalities, and based on these covariations, the data is decomposed

Nicolle M. Correa; Tom Eichele; Tülay Adali; Yi-Ou Li; Vince D. Calhoun

2010-01-01

437

Primary motor cortex excitability is modulated with bimanual training.  

PubMed

Bimanual visuomotor movement has been shown to enhance cortical motor activity in both hemispheres, especially when movements require simultaneous activation of homologous muscle groups (in-phase movement). It is currently unclear if these adaptations are specific to motor preparatory areas or if they also involve changes in primary motor cortex (M1). The present study investigated the representation of wrist muscles within motor cortex before and following bimanual movement training that was in-phase, anti-phase with or without motor preparation. Motor evoked potentials (MEPs) for the extensor carpi radialis muscle (ECR) cortical territory were acquired and analyzed before and following bimanual movement. The cortical representation was quantified and compared in terms of spatial extent and MEP amplitude, in two different experiments involving distinct movement training types. In Experiment 1, participants performed bimanual wrist flexion/extension movements to targets which involved in-phase movements, either following a 2s preparation period (In-phase preparation), or without the preparation period (In-phase no preparation). In Experiment 2, training involved antagonist muscle groups activated simultaneously (Anti-phase) with the addition of the 2s preparation period. In-phase bimanual movement enhanced the spatial representation of ECR in M1, and did not show a difference in MEP amplitude of the cortical area. It may be that simultaneous activation of homologous M1 representations in both hemispheres, in combination with activity from premotor areas, leads to a greater increase in plasticity in terms of increased M1 spatial extent of trained muscles. PMID:22405809

Neva, Jason L; Legon, Wynn; Staines, W Richard

2012-03-03

438

Motor power control circuit for ac induction motors  

NASA Astrophysics Data System (ADS)

A motor power control of the type which functions by controlling the power factor wherein one of the parameters of power factor current on time is determined by the on time of a triac through which current is supplied to the motor. By means of a positive feedback circuit, a wider range of control is effected.

Nola, F. J.

1983-03-01

439

Intermittent rectal motor activity: a rectal motor complex?  

PubMed Central

Prolonged nocturnal recordings from multiple sites in the anorectum and duodenum were performed in 12 healthy volunteers to investigate the presence and determine the characteristics of nocturnal rectal motor activity and assess any synchronicity with phase III of the small intestinal migrating motor complex. Runs of phasic contractions of two contractile frequencies (3 or 6/minute), sustained for more than three minutes, and preceded and followed by motor quiescence were observed in 10 of the 12 subjects. This phenomenon is similar to that described by other investigators and termed the 'rectal motor complex'. The runs of contractions showed considerable inter- and intrasubject variation, with a duration of 3-30 minutes (median 9.0), amplitude of 10-55 mm Hg (median 20.0), and periods of 10-420 minutes (median 55.5) between contractile activity. There was no propagation through the rectum, the phasic motor activity rarely occurred simultaneously at more than one rectal recording site. No consistent relation with phase III of the small intestinal migrating motor complex was observed in any subject. In view of these findings, we question whether this intermittent motor activity merits the term 'rectal motor complex'.

Prior, A; Fearn, U J; Read, N W

1991-01-01

440

Motor Constants Measurement for Induction Motors without Rotating  

NASA Astrophysics Data System (ADS)

In the induction motor drive using sensorless control or vector control, the control calculation is performed based on motor constants. Motor constants are obtained by no load test and lock test. However no load test and lock test are inapplicable to the induction motors joined to machines. This paper suggests the novel method of motor constants measurement without rotating for induction motors. The feature of this novel method is measuring only imaginary part of equivalent impedance of T type equivalent circuit of the induction motor on stop state by supplying the low frequency alternating voltage when measuring mutual inductance and rotor resistance. The reason is because the measured value of the real part of equivalent impedance is not exact because of the error of stator resistance and the voltage error which the dead time causes. It was confirmed by the experiment that this novel method enables to set control parameters correctly and to drive stably induction motors joined to machines with speed sensorless vector control.

Kobayashi, Takahiko; Kimpara, Yoshihiko; Fukuta, Masahiro; Ohnuma, Takumi

441

Motor-operated valve (MOV) actuator motor and gearbox testing  

SciTech Connect

Researchers at the Idaho National Engineering and Environmental Laboratory tested the performance of electric motors and actuator gearboxes typical of the equipment installed on motor-operated valves used in nuclear power plants. Using a test stand that simulates valve closure loads against flow and pressure, the authors tested five electric motors (four ac and one dc) and three gearboxes at conditions a motor might experience in a power plant, including such off-normal conditions as operation at high temperature and reduced voltage. They also monitored the efficiency of the actuator gearbox. All five motors operated at or above their rated starting torque during tests at normal voltages and temperatures. For all five motors, actual torque losses due to voltage degradation were greater than the losses calculated by methods typically used for predicting motor torque at degraded voltage conditions. For the dc motor the actual torque losses due to elevated operating temperatures were greater than the losses calculated by the typical predictive method. The actual efficiencies of the actuator gearboxes were generally lower than the running efficiencies published by the manufacturer and were generally nearer the published pull-out efficiencies. Operation of the gearbox at elevated temperature did not affect the operating efficiency.

DeWall, K.; Watkins, J.C.; Bramwell, D. [Lockheed Idaho Technologies Co., Idaho Falls, ID (United States)

1997-07-01

442

The moving phantom: Motor execution or motor imagery?  

Microsoft Academic Search

Amputees who have a phantom limb often report the ability to move this phantom voluntarily. In the literature, phantom limb movements are generally considered to reflect motor imagery rather than motor execution. The aim of this study was to investigate whether amputees distinguish between executing a movement of the phantom limb and imagining moving the missing limb. We examined the

Estelle Raffin; Pascal Giraux; Karen T. Reilly

443

Speckled microtubules improve tracking in motor-protein gliding assays  

NASA Astrophysics Data System (ADS)

Gliding assays of motor proteins such as kinesin, dynein and myosin are commonly carried out with fluorescently labeled microtubules or filamentous actin. In this paper, we show that speckled microtubules (MTs), prepared by copolymerizing 98% unlabeled tubulin with 2% rhodamine-labeled tubulin, can be localized to ±7.4 nm (24 measurements) in images acquired every 125 ms. If the speckled MTs move at about 800 nm s-1, ten images are sufficient to determine their velocity to a precision of ±6.8 nm s-1 (6 microtubules, 24 measurements). This velocity precision is four-fold better than manual methods for measuring the gliding velocity of uniformly labeled MTs by end-point localization. The improved velocity precision will permit the determination of velocity-force curves when one, two and three kinesin motors pull a single load in vitro.

Chisena, Ernest N.; Wall, R. Andrew; Macosko, Jed C.; Holzwarth, George

2007-03-01

444

Computational fusion magnetohydrodynamics  

SciTech Connect

Simple magnetohydrodynamic models provide the framework for much of our understanding of the macroscopic behavior of magnetically confined laboratory plasmas. In even the simplest of models, however, the many different time and spatial scales, the multidimensionality, and the nonlinearity of the equations make finding solutions difficult. In realistic geometries obtaining quantitative results to aid our understanding, to interpret experiment, and to design new devices, involves the development of large scale numerical codes. During the past decade considerable effort has been extended in the fusion community to develop equilibrium, linear stability, and nonlinear time evolution codes in two and three dimensions, some of which have had a considerable impact on the fusion program. An overview of the various types of codes and numerical methods is given. Emphasis is on the spectrum of linear perturbations and ideal MHD stability, boundary layer methods and resistive MHD stability, and modeling of nonlinear, time evolution resistive MHD phenomena in tokamak configurations.

Grimm, R.C.

1984-01-01

445

Fusion pumped laser  

DOEpatents

The apparatus of this invention may comprise a system for generating laser radiation from a high-energy neutron source. The neutron source is a tokamak fusion reactor generating a long pulse of high-energy neutrons and having a temperature and magnetic field effective to generate a neutron flux of at least 10/sup 15/ neutrons/cm/sup 2//center dot/s. Conversion means are provided adjacent the fusion reactor at a location operable for converting the high-energy neutrons to an energy source with an intensity and energy effective to excite a preselected lasing medium. A lasing medium is spaced about and responsive to the energy source to generate a population inversion effective to support laser oscillations for generating output radiation. 2 figs., 2 tabs.

Pappas, D.S.

1987-07-31

446

Adaptive sensor fusion  

NASA Astrophysics Data System (ADS)

A perceptual reasoning system adaptively extracting, associating, and fusing information from multiple sources, at various levels of abstraction, is considered as the building block for the next generation of surveillance systems. A system architecture is presented which makes use of both centralized and distributed predetection fusion combined with intelligent monitor and control coupling both on-platform and off-board track and decision level fusion results. The goal of this system is to create a `gestalt fused sensor system' whose information product is greater than the sum of the information products from the individual sensors and has performance superior to either individual or a sub-group of combined sensors. The application of this architectural concept to the law enforcement arena (e.g. drug interdiction) utilizing multiple spatially and temporally diverse surveillance platforms and/or information sources, is used to illustrate the benefits of the adaptive perceptual reasoning system concept.

Kadar, Ivan

1995-07-01

447

Crystal structure of the Candida albicans Kar3 kinesin motor domain fused to maltose-binding protein.  

PubMed

In the human fungal pathogen Candida albicans, the Kinesin-14 motor protein Kar3 (CaKar3) is critical for normal mitotic division, nuclear fusion during mating, and morphogenic transition from the commensal yeast form to the virulent hyphal form. As a first step towards detailed characterization of this motor of potential medical significance, we have crystallized and determined the X-ray structure of the motor domain of CaKar3 as a maltose-binding protein (MBP) fusion. The structure shows strong conservation of overall motor domain topology to other Kar3 kinesins, but with some prominent differences in one of the motifs that compose the nucleotide-binding pocket and the surface charge distribution. The MBP and Kar3 modules are arranged such that MBP interacts with the Kar3 motor domain core at the same site where the neck linker of conventional kinesins docks during the "ATP state" of the mechanochemical cycle. This site differs from the Kar3 neck-core interface in the recent structure of the ScKar3Vik1 heterodimer. The position of MBP is also completely distinct from the Vik1 subunit in this complex. This may suggest that the site of MBP interaction on the CaKar3 motor domain provides an interface for the neck, or perhaps a partner subunit, at an intermediate state of its motile cycle that has not yet been observed for Kinesin-14 motors. PMID:23137538

Delorme, Caroline; Joshi, Monika; Allingham, John S

2012-11-05

448

Haemorrhagic pure motor stroke.  

PubMed

To describe the clinical characteristics of haemorrhagic pure motor stroke (PMS). Twelve patients with haemorrhagic PMS were identified. Haemorrhagic PMS accounted for 3.2% of all cases of pure motor hemiparesis (n = 380) and 3.3% of intracerebral haemorrhage (n = 364) entered in the database. When compared with PMS of ischaemic origin, patients with haemorrhagic PMS were more likely to be younger (62.2 vs. 75.2 years, P = 0.003) and to have headache (33% vs. 6.3%, P =0.007) and thalamus involvement (25% vs. 2.4%, P = 0.005). Limb weakness (100% vs. 74.1%; P = 0.03), involvement of the internal capsule (50% vs. 17.3%, P = 0.012) and symptom free at discharge (25% vs. 3.7%, P = 0.012) were significantly more frequent in patients with haemorrhagic PMS than in the remaining cases of haemorrhagic stroke, whereas nausea and vomiting (0% vs. 25.9%, P = 0.03), altered consciousness (0% vs. 42.9%, P = 0.001), sensory symptoms (8.3% vs. 46.9%, P =0.007) and ventricular haemorrhage (0% vs. 26.1%, P = 0.028) were significantly less frequent. Haemorrhagic PMS is a very infrequent stroke subtype. Headache at stroke onset may be useful sign for distinguishing haemorrhagic PMS from other causes of lacunar stroke. There are important differences between haemorrhagic PMS and the remaining intracerebral haemorrhages. PMID:17250733

Arboix, A; García-Eroles, L; Massons, J; Oliveres, M; Balcells, M

2007-02-01

449

Fusion development and technology  

SciTech Connect

This report discusses the following: superconducting magnet technology; high field superconductors; advanced magnetic system and divertor development; poloidal field coils; gyrotron development; commercial reactor studies--aries; ITER physics: alpha physics and alcator R D for ITER; lower hybrid current drive and heating in the ITER device; ITER superconducting PF scenario and magnet analysis; ITER systems studies; and safety, environmental and economic factors in fusion development.

Montgomery, D.B.

1992-01-01

450

Inertial confinement fusion  

NASA Astrophysics Data System (ADS)

Papers on the following topics are presented: a nondestructive method for measuring the fill pressure and permeability of fuel-filled plastic shells; an improved method for making polystyrene microspheres; indirect-drive Rayleigh-Taylor experiments using shape laser pulses; intensity scaling of stimulated raman forward scattering; beam propagation across the target chamber in heavy-ion fusion; preparations and properties of brominated polymer coatings; and beam-smoothing capability on the Nova laser.

Bernat, T. P.

451

How Many Fusion Barriers?  

Microsoft Academic Search

Fusion barrier distributions for the 20Ne + 112,116,118Sn systems have been extracted from quasi-elastic scattering cross sections measured at the Warsaw HIL Cyclotron. Results are compared to coupled-channels calculations performed with the CCFULL code. The overall widths of the distributions are reproduced on taking account of the low-lying collective states of the target and projectile but some puzzling discrepancies in

L. Swiderski; P. Czosnyka; M. Kowalczyk; E. Piasecki; K. Piasecki; M. Witecki; J. JastrzEBSKI; A. Kordyasz; M. Kisielinski; T. Krogulski; N. Rowley; C. Marchetta; A. Pagano; M. Mutterer; W. H. Trzaska; K. Hagino

2004-01-01

452

Solar fusion cross sections  

Microsoft Academic Search

We review and analyze the available information on the nuclear-fusion cross sections that are most important for solar energy generation and solar neutrino production. We provide best values for the low-energy cross-section factors and, wherever possible, estimates of the uncertainties. We also describe the most important experiments and calculations that are required in order to improve our knowledge of solar

Eric G. Adelberger; Sam M. Austin; John N. Bahcall; A. B. Balantekin; Gilles Bogaert; Lowell S. Brown; Lothar Buchmann; F. Edward Cecil; Arthur E. Champagne; Ludwig de Braeckeleer; Charles A. Duba; Steven R. Elliott; Stuart J. Freedman; Moshe Gai; G. Goldring; Christopher R. Gould; Andrei Gruzinov; Wick C. Haxton; Karsten M. Heeger; Ernest Henley; Calvin W. Johnson; Marc Kamionkowski; Ralph W. Kavanagh; Steven E. Koonin; Kuniharu Kubodera; Karlheinz Langanke; Tohru Motobayashi; Vijay Pandharipande; Peter Parker; R. G. Robertson; Claus Rolfs; R. F. Sawyer; N. Shaviv; T. D. Shoppa; K. A. Snover; Erik Swanson; Robert E. Tribble; Sylvaine Turck-Chičze; John F. Wilkerson

1998-01-01

453

Community-acquired pneumonia in the elderly.  

PubMed

The incidence of community-acquired pneumonia (CAP) in the elderly is higher compared to younger populations. In addition, pneumonia in the elderly is a life-threatening problem. As our demographics have changed, clinicians have developed a heightened interest in managing pneumonia in the elderly. The development of pneumonia in elderly patients differs from that in younger individuals due to a complex array of factors. (1) The organisms involved depend on the setting in which the pneumonia developed: either the nonhospitalized elderly patient with CAP or the institutionalized patient who develops nursing-home-acquired pneumonia. (2) Underlying comorbid conditions commonly exist in the elderly that affect the etiology and outcome of pneumonia. Overall, Streptococcus pneumoniae and Haemophilus influenzae are still the most common etiologies of pneumonia in the elderly. The true role of gram-negative bacilli remains unclear although these micro-organisms may be more common etiologic agents in nursing-home pneumonia. Some recent studies from Mediterranean areas have reported high rates of infection by Chlamydia pneumoniae, but the real role of this micro-organism has to be confirmed. Another important issue is that the presenting symptoms of pneumonia in the elderly can be subtle and sometimes difficult to recognize. Fever is frequently absent, and delirium or alteration of functional physical capacity may be the only manifestations. Mortality in the elderly with CAP is higher when compared to younger populations. However, this may be explained by the concomitant presence of comorbid conditions more than by age per se. This statement has to be kept in mind when considering hospital and, particularly, intensive care unit admissions. Finally, antibiotic pharmacokinetics in the elderly populations with CAP ought to be considered to avoid frequent side-effects and complications. Overall, antibiotic regimens in hospitalized elderly patients with CAP do not differ from other hospitalized CAP populations. An organized approach to assessing elderly patients with suspicion of pneumonia and an awareness of common pitfalls in the management of this pulmonary infection in this population are essential to improving outcomes. PMID:10391411

Torres, A; El-Ebiary, M; Riquelme, R; Ruiz, M; Celis, R

1999-06-01

454

Cargo transport by several motors  

NASA Astrophysics Data System (ADS)

In a cell, organelles and vesicles are usually transported by cooperation of several motor proteins, including plus-end-directed motor kinesin and minus-end-directed motor dynein. In recent years, many biophysical models have been constructed to understand the mechanism of this transport; however, so far, its basic principle has not been completely understood. In this paper, we will present a model that is based on recent experimental results and existing theoretical models. In this model, each motor is regarded as a head-spring system. The head can bind to or detach from the track stochastically, and step forward or backward with a fixed step size L and force-dependent transition rates. The spring connects the head to the cargo tightly. The position of the cargo is determined by the force-balance condition. An obvious characteristic of our model is that the motors interact with each other and do not share the external load equally. Results indicate that the basic properties of the cargo, including its mean velocity and stall force (definitions are given in the text), are greatly affected by the intermotor interaction. Stated simplistically, the mean velocity and (average) stall force decrease with the intermotor interaction. Therefore, in a sense, the intermotor interaction is negative to the cooperate motion of motors. However, if the cargo is pulled by motors from the same species, its (average) stall force is usually larger than that of the single motor; this means that under external load, the velocity of cargo transported by several motors might be higher than the single-motor cases. We can infer from this that the cooperation of motors is beneficial to draw big cargoes, while it is not as beneficial as one might expect to improve motion velocity when the external load is low.

Zhang, Yunxin

2011-01-01

455

Artificial neural network based fault identification scheme implementation for a three-phase induction motor.  

PubMed

This paper presents results from the implementation and testing of a PC based monitoring and fault identification scheme for a three-phase induction motor using artificial neural networks (ANNs). To accomplish the task, a hardware system is designed and built to acquire three-phase voltages and currents from a 1/3 HP squirrel-cage, three-phase induction motor. A software program is written to read the voltages and currents, which are first used to train a feed-forward neural network structure using the JavaNNS program. The trained network is placed in a LabVIEW based program formula node that monitors the voltages and currents online and displays the fault conditions and turns the motor off. The complete system is successfully tested in real time by creating different faults on the motor. PMID:17336306

Kolla, Sri R; Altman, Shawn D

2007-03-02

456

Aberrant supplementary motor complex and limbic activity during motor preparation in motor conversion disorder.  

PubMed

Conversion disorder (CD) is characterized by unexplained neurological symptoms presumed related to psychological issues. The main hypotheses to explain conversion paralysis, characterized by a lack of movement, include impairments in either motor intention or disruption of motor execution, and further, that hyperactive self-monitoring, limbic processing or top-down regulation from higher order frontal regions may interfere with motor execution. We have recently shown that CD with positive abnormal or excessive motor symptoms was associated with greater amygdala activity to arousing stimuli along with greater functional connectivity between the amygdala and supplementary motor area. Here we studied patients with such symptoms focusing on motor initiation. Subjects performed either an internally or externally generated 2-button action selection task in a functional MRI study. Eleven CD patients without major depression and 11 age- and gender-matched normal volunteers were assessed. During both internally and externally generated movement, conversion disorder patients relative to normal volunteers had lower left supplementary motor area (SMA) (implicated in motor initiation) and higher right amygdala, left anterior insula, and bilateral posterior cingulate activity (implicated in assigning emotional salience). These findings were confirmed in a subgroup analysis of patients with tremor symptoms. During internally versus externally generated action in CD patients, the left SMA had lower functional connectivity with bilateral dorsolateral prefrontal cortices. We propose a theory in which previously mapped conversion motor representations may in an arousing context hijack the voluntary action selection system, which is both hypoactive and functionally disconnected from prefrontal top-down regulation. PMID:21935985

Voon, Valerie; Brezing, Christina; Gallea, Cecile; Hallett, Mark

2011-09-20

457

Walking dreams in congenital and acquired paraplegia.  

PubMed

To test if dreams contain remote or never-experienced motor skills, we collected during 6 weeks dream reports from 15 paraplegics and 15 healthy subjects. In 9/10 subjects with spinal cord injury and in 5/5 with congenital paraplegia, voluntary leg movements were reported during dream, including feelings of walking (46%), running (8.6%), dancing (8%), standing up (6.3%), bicycling (6.3%), and practicing sports (skiing, playing basketball, swimming). Paraplegia patients experienced walking dreams (38.2%) just as often as controls (28.7%). There was no correlation between the frequency of walking dreams and the duration of paraplegia. In contrast, patients were rarely paraplegic in dreams. Subjects who had never walked or stopped walking 4-64 years prior to this study still experience walking in their dreams, suggesting that a cerebral walking program, either genetic or more probably developed via mirror neurons (activated when observing others performing an action) is reactivated during sleep. PMID:21704532

Saurat, Marie-Thérčse; Agbakou, Maité; Attigui, Patricia; Golmard, Jean-Louis; Arnulf, Isabelle

2011-06-24

458

Stabilized Spheromak Fusion Reactors  

SciTech Connect

The U.S. fusion energy program is focused on research with the potential for studying plasmas at thermonuclear temperatures, currently epitomized by the tokamak-based International Thermonuclear Experimental Reactor (ITER) but also continuing exploratory work on other plasma confinement concepts. Among the latter is the spheromak pursued on the SSPX facility at LLNL. Experiments in SSPX using electrostatic current drive by coaxial guns have now demonstrated stable spheromaks with good heat confinement, if the plasma is maintained near a Taylor state, but the anticipated high current amplification by gun injection has not yet been achieved. In future experiments and reactors, creating and maintaining a stable spheromak configuration at high magnetic field strength may require auxiliary current drive using neutral beams or RF power. Here we show that neutral beam current drive soon to be explored on SSPX could yield a compact spheromak reactor with current drive efficiency comparable to that of steady state tokamaks. Thus, while more will be learned about electrostatic current drive in coming months, results already achieved in SSPX could point to a productive parallel development path pursuing auxiliary current drive, consistent with plans to install neutral beams on SSPX in the near future. Among possible outcomes, spheromak research could also yield pulsed fusion reactors at lower capital cost than any fusion concept yet proposed.

Fowler, T

2007-04-03

459

Neuromuscular ultrasound in polyneuropathies and motor neuron disease.  

PubMed

Current standards for diagnosing polyneuropathies (PN) and motor neuron disease (MND) sometimes lack early sensitivity and result in delayed diagnosis and treatment. Neuromuscular ultrasound (NMUS), already established in the diagnosis of entrapment neuropathies, may offer another means of diagnosis and monitoring response to therapy. This review of current evidence discusses diffuse nerve hypertrophy in hereditary demyelinating neuropathies, multifocal nerve enlargement in acquired demyelinating PN and the lack of readily apparent structural change in axonal neuropathies. NMUS detection of fasciculations and muscular change in MND is also reviewed, along with the need for further research to better define the role of nerve imaging in patients with PN. PMID:23629869

Hobson-Webb, Lisa D

2013-04-29

460

Acquired von Willebrand syndrome in multiple myeloma.  

PubMed

Acquired von Willebrand syndrome (AvWS) is an uncommon complication of multiple myeloma (MM), and it is believed to be connected with paraprotein. The aim of this study was to determine the incidence of AvWS in patients with MM, and estimate the role of paraprotein in its occurrence. The study included 40 patients with MM. The plasma level of paraprotein, platelet adhesion on glass pearls, plasma von Willebrand factor antigen concentration, and ristocetin-induced platelet aggregation (RIPA) were measured initially. Absence of RIPA was found in six patients with MM (15%); however, all six of them had normal levels of von Willebrand factor antigen. Paraprotein was isolated from the serum of these patients. Platelet aggregation was measured in six healthy donors before and after addition of the isolated paraprotein. RIPA was significantly decreased in healthy donors in the presence of paraprotein (P<0·001). The same test was repeated with added human immunoglobulins for intravenous use without any change in RIPA. A significant negative correlation between plasma paraprotein level and RIPA was found (P<0·001). These investigations have shown that paraprotein is associated with AvWS in patients with MM. PMID:21756536

Djunic, Irena; Elezovic, Ivo; Ilic, Vesna; Tomin, Dragica; Suvajdzic-Vukovic, Nada; Bila, Jelena; Antic, Darko; Vidovic, Ana; Milosevic-Jovcic, Nadezda

2011-07-01

461

Gastrointestinal Manifestations of the Acquired Immunodeficiency Syndrome  

PubMed Central

In addition to abnormalities in systemic immune function, patients with the acquired immunodeficiency syndrome (AIDS) and the pre-AIDS syndromes have significant abnormalities in the distribution of T-cell subsets in the intestinal tract. Such immune deficits predispose such patients to opportunistic infections and tumors, many of which involve the gastrointestinal tract. For example, Candida albicans often causes stomatitis and esophagitis. Intestinal infections with parasites (Cryptosporidium, Isospora belli, Microsporidia) or bacteria (Mycobacterium avium-intracellulare) are associated with severe diarrhea and malabsorption, whereas viruses like cytomegalovirus and herpes simplex virus cause mucosal ulcerations. Clinically debilitating chronic diarrhea develops in many AIDS patients for which no clear cause can be identified. Enteric pathogens like Salmonella and Campylobacter can be associated with bacteremias. Kaposi's sarcoma and lymphoma involving the intestinal tract are now well-recognized complications of AIDS. Although AIDS is not associated with a pathognomonic liver lesion, opportunistic infections and Kaposi's sarcoma or lymphoma may involve the liver. ImagesFigure 3.Figure 4.Figure 5.Figure 6.Figure 7.

Rodgers, Vance D.; Kagnoff, Martin F.

1987-01-01

462

Acquired 'theory of mind' impairments following stroke.  

PubMed

The ability to attribute thoughts and feelings to self and others ('theory of mind') has been hypothesised to have an innate neural basis and a dedicated cognitive mechanism. Evidence in favour of this proposal has come from autism; a brain-based developmental disorder which appears to be characterised by impaired theory of mind, despite sometimes good general reasoning skills/IQ. To date no case of specific acquired theory of mind impairment has been reported. The present study examined theory of mind in adults who had suffered right hemisphere stroke, a group known to show pragmatic and social difficulties. In one study using story materials and two using cartoons, patients' understanding of materials requiring attribution of mental states (e.g. ignorance, false belief) was significantly worse than their understanding of non-mental control materials. Data from healthy elderly subjects, and a small group of left hemisphere patients (who received the tasks in modified form), suggest that this impairment on mental state tasks is not a function of task difficulty. The findings support the notion of a dedicated cognitive system for theory of mind, and suggest a role for the healthy right hemisphere in the attribution of mental states. PMID:10384736

Happé, F; Brownell, H; Winner, E

1999-04-01

463

Type III hyperlipoproteinemia acquired by liver transplantation.  

PubMed

A case of type III hyperlipoproteinemia (HLP) (dysbetalipoproteinemia) acquired by liver transplantation is reported. The 50-year-old female patient was referred to the Frankfurt University Hospital for orthotopic liver transplantation. She had suffered from ethylic liver cirrhosis. The donor liver showed discrete signs of steatosis. The postoperative course of the patient was satisfactory. Enzyme levels and blood coagulation tests returned to normal within thirty days. However, both cholesterol and triglycerides gradually increased from approximately 2.00 g/L to values ranging from 2.50 to 3.50 g/L within 200 days after transplantation. Cutaneous xanthomas did not develop. The patient's lipoprotein pattern met the criteria of type III HLP: the cholesterol to triglyceride ratio in very low-density lipoproteins (VLDL) was 0.64. Intermediate-density lipoprotein(IDL) cholesterol was 0.48 g/L. Lipoprotein electrophoresis showed a broad beta-band, and beta-migrating particles were present in VLDL. Immunoblotting of apolipoprotein (apo) E from the patient's plasma revealed an E2/2 phenotype. However, restriction isotyping of an in vitro amplified apoE gene fragment showed the genotype of the patient to be epsilon 3/epsilon 4. These data suggest that the development of type III HLP in this patient was due to a change in the apoE phenotype from E3/4 to E2/2 after liver transplantation. PMID:8434377

März, W; Peschke, B; Ruzicka, V; Siekmeier, R; Gross, W; Schoeppe, W; Scheuermann, E

1993-02-01

464

Changing needs of community-acquired pneumonia  

PubMed Central

Community-acquired pneumonia (CAP) is a serious condition associated with significant morbidity and potential long-term mortality. Although the majority of patients with CAP are treated as outpatients, the greatest proportion of pneumonia-related mortality and healthcare expenditure occurs among the patients who are hospitalized. There has been considerable interest in determining risk factors and severity criteria assessments to assist with site-of-care decisions. For both inpatients and outpatients, the most common pathogens associated with CAP include Streptococcus pneumoniae, Haemophilus influenzae, group A streptococci and Moraxella catarrhalis. Atypical pathogens, Gram-negative bacilli, methicillin-resistant Staphylococcus aureus (MRSA) and viruses are also recognized aetiological agents of CAP. Despite the availability of antimicrobial therapies, the recent emergence of drug-resistant pneumococcal and staphylococcal isolates has limited the effectiveness of currently available agents. Because early and rapid initiation of empirical antimicrobial treatment is critical for achieving a favourable outcome in CAP, newer agents with activity against drug-resistant strains of S. pneumoniae and MRSA are needed for the management of patients with CAP.

Ramirez, Julio Alberto; Anzueto, Antonio R.

2011-01-01

465

Murine models for acquired immune deficiency syndrome.  

PubMed

The mouse has been suggested as a host for comparative studies of several aspects of Human Acquired Immune Deficiency Syndrome (AIDS). Models include studies where part or all of the genome of Human Immunodeficiency Virus (HIV) has been incorporated into murine DNA in living mice. However, the most promising opportunities for study of immunological changes, vaccine development, cofactor involvement in disease, and anti-retroviral and immunostimulatory drug testing involve infection with murine retroviruses which cause many functional changes similar to AIDS. The viruses' effects on immune systems are reviewed with special emphasis. LP-BM5 murine leukemia virus which infects T and B cells, and macrophages. LP-BM5 infection suppresses cell functions while causing polyclonal lymphocyte activation. Murine immunological characterization, availability of inbred mouse strains, economy of using mice versus primates or humans models, and similarity of immune change caused by murine retroviruses compared to those seen in AIDS caused by HIV encourage rapid development of the LP-BM5 murine leukemia model. PMID:2536876

Watson, R R

1989-01-01

466

Acquired brain damage and driving: a review.  

PubMed

Five issues in evaluating driving ability after brain damage were addressed through a review of the literature. Some preliminary conclusions were reached: (1) about half of all subjects studied still hold a valid driver's license; (2) brain-damaged drivers could not, in general, be seen as risky drivers, although some individuals show decreased driving skill and risky behavior in traffic; and (3) statistics show no increase in traffic violations or accidents in groups of neurologic patients with acquired brain lesions or diseases. Frequently noted problems of brain-damaged drivers include poor judgment of traffic situations, impulsivity, and visuospatial impairments. Traditional psychologic tests have insufficient predictive value regarding fitness to drive. It is suggested that new techniques be developed to enable more valid statements about the skills needed for safe traffic participation. These assessment techniques should emphasize the higher cognitive levels in driving, ie, the tactical and strategic levels. At the moment, driver training programs in rehabilitation focus mainly on the operational level, with emphasis on handling the car, use of controls and mirrors, and technical adaptation of the vehicle. PMID:3310958

van Zomeren, A H; Brouwer, W H; Minderhoud, J M

1987-10-01

467

[Spontaneous acquired localized neuropathies in childhood].  

PubMed

Acquired non-surgical, non-traumatic localized neuropathies, excluding cranial nerve disorders, are rare in infancy. We review the clinical histories of six children, studied for this disorders amongst a total of 2,105 children seen in the Neuropediatric Department of the Hospital Miguel Servet in Zaragoza. Two were diagnosed as familial neuropathy with pressure sensitive paralysis. Two plexopathies were considered to be familial brachial plexopathy with minor dysmorphic features. One case was diagnosed as idiopathic radial neuropathy and a further case as idiopathic lumbosacral plexopathy. We emphasize that although rare in pediatrics, spontaneous localized neuropathies often show constitutional pathology, frequently hereditary. Idiophatic cases may also be hereditary, and it may be difficult to confirm the diagnosis if there is no family history or phenotypic characteristics. Diagnosis depends on the personal and family history, physical examination, neurophysiological study, absence of abnormal neuroimaging findings and awareness of the possibility of this diagnosis. These disorders probably occur more often than is generally believed. PMID:9244623

Peńa, J L; Marco, M; Gros, L; López Pisón, J

1997-06-01

468

Activities for a Perceptual Motor Program.  

ERIC Educational Resources Information Center

Perceptual motor activities for physically handicapped children are presented in the areas of fine and gross motor skills. Also detailed are activities to develop body image, visual motor skills, and tactile and auditory perception. (JD)

Brinning, Dorothy; And Others

469

Fault analysis of induction motor  

Microsoft Academic Search

A method for the fault diagnosis of a broken rotor bar in induction motor is presented. The method is based on the analysis of the magnetic flux of three-phase Induction motor. The purpose of this paper is the analysis of the inverter fed induction machine with broken rotor for diagnostic purposes. The features of magnetic flux of healthy conditions of

I. Kathir; S. Balakrishnan; R. J. Bevila

2011-01-01

470

Energy-saving asynchronous motors  

Microsoft Academic Search

The results of activities on creating asynchronous motors with rotor cast copper windings in Ukraine, the United States, France,\\u000a Italy, Germany, Poland, Brazil, and India are analyzed. Tests have shown that motors have higher efficiency and higher useful\\u000a power than analogs.

V. A. Chuvashev; S. S. Nalivaiko; A. V. Shishov; D. V. Tsvetaev; Yu. N. Papazov

2009-01-01

471

Advances in brushless motor control  

Microsoft Academic Search

Brushless DC servomotors have been replacing brush type motors in machine tool and robotics applications over the last number of years. The well known advantages of brushless over brush motors include improved reliability, higher power to weight ratios, and an overall better dynamic performance. This paper briefly describes the evolution in the control of brushless drive systems which has been

Aengus Murray; Paul Kettle; Finbarr Moynihan

1997-01-01

472

Motor Coordination and Executive Functions  

ERIC Educational Resources Information Center

|Since Piaget, the view that motor and cognitive development are interrelated has gained wide acceptance. However, empirical research on this issue is still rare. Few studies show a correlation of performance in cognitive and motor tasks in typically developing children. More specifically, Diamond A. (2000) hypothesizes an involvement of executive…

Michel, Eva

2012-01-01

473

Power control for ac motor  

NASA Astrophysics Data System (ADS)

A motor controller employing a triac through which power is supplied to a motor is described. The open circuit voltage appearing across the triac controls the operation of a timing circuit. This timing circuit triggers on the triac at a time following turn off which varies inversely as a function of the amplitude of the open circuit voltage of the triac.

Dabney, R. W.

1984-12-01

474

Miniature solid propellant rocket motor.  

National Technical Information Service (NTIS)

A miniature solid-propellant rocket motor has been developed to impart a specific motion to an object deployed in space. This rocket motor effectively eliminated the need for a cold-gas thruster system or mechanical spin-up system. A low-energy igniter, a...

M. C. Grubelich M. Hagan E. Mulligan

1997-01-01

475

Power Control for AC Motor.  

National Technical Information Service (NTIS)

A motor controller employing a triac through which power is supplied to a motor and wherein the open circuit voltage appearing across the triac controls the operation of a timing circuit which triggers on the triac at a time following turn off which varie...

R. W. Dabney

1983-01-01

476

Motors and Bulbs in Series  

ERIC Educational Resources Information Center

|One of Paul Hewitt's "Figuring Physics" that appeared in this journal dealt with the heating of a motor. This phenomenon can be demonstrated with a miniature motor and a bulb as part of a series of activities with "batteries and bulbs." Students examine the effect on the brightness of a single bulb when a second, identical bulb is placed in…

Whitaker, Robert J.

2009-01-01

477

Present status of ultrasonic motors  

Microsoft Academic Search

The principle, features, and classification of ultrasonic motors are briefly described. The classification scheme, which is based on the way elliptic motion is created in the stator, consists of six categories: standing-wave, traveling-wave, mode-conversion, mode-rotation, multimode, and hybrid transducer motors. Research trends are reviewed

S. Ucha

1989-01-01

478

Deficient motor synchrony in schizophrenia  

Microsoft Academic Search

Introduced a laboratory measure of motor function, synchronization of tapping with an auditory stimulus, as an index of motor disorganization in schizophrenia. It was hypothesized that (a) schizophrenics' performance on this task would be distinguishable from that of controls and would reflect a relative inability to take advantage of stimulus predictability, independent of task difficulty; (b) clinical measures of disturbed

Theo C. Manschreck; Mary E. Rucklos; Donald R. Veneer; Deborah N. Ader

1981-01-01

479

Molecular Motors: A Theorist's Perspective  

NASA Astrophysics Data System (ADS)

Individual molecular motors, or motor proteins, are enzymatic molecules that convert chemical energy, typically obtained from the hydrolysis of ATP (adenosine triphosphate), into mechanical work and motion. Processive motor proteins, such as kinesin, dynein, and certain myosins, step unidirectionally along linear tracks, specifically microtubules and actin filaments, and play a crucial role in cellular transport processes, organization, and function. In this review some theoretical aspects of motor-protein dynamics are presented in the light of current experimental methods that enable the measurement of the biochemical and biomechanical properties on a single-molecule basis. After a brief discussion of continuum ratchet concepts, we focus on discrete kinetic and stochastic models that yield predictions for the mean velocity, V(F, [ATP], …), and other observables as a function of an imposed load force F, the ATP concentration, and other variables. The combination of appropriate theory with single-molecule observations should help uncover the mechanisms underlying motor-protein function.

Kolomeisky, Anatoly B.; Fisher, Michael E.

2007-05-01

480

Antibody-targeted cell fusion.  

PubMed

Membrane fusion has many potential applications in biotechnology. Here we show that antibody-targeted cell fusion can be achieved by engineering a fusogenic viral membrane glycoprotein complex. Three different single-chain antibodies were displayed at the extracellular C terminus of the measles hemagglutinin (H) protein, and combinations of point mutations were introduced to ablate its ability to trigger fusion through the native viral receptors CD46 and SLAM. When coexpressed with the measles fusion (F) protein, using plasmid cotransfection or bicistronic adenoviral vectors, the retargeted H proteins could mediate antibody-targeted cell fusion of receptor-negative or receptor-positive index cells with receptor-positive target cells. Adenoviral expression vectors mediating human epidermal growth factor receptor (EGFR)-targeted cell fusion were potently cytotoxic against EGFR-positive tumor cell lines and showed superior antitumor potency against EGFR-positive tumor xenografts as compared with control adenoviruses expressing native (untargeted) or CD38-targeted H proteins. PMID:14990955

Nakamura, Takafumi; Peng, Kah-Whye; Vongpunsawad, Sompong; Harvey, Mary; Mizuguchi, Hiroyuki; Hayakawa, Takao; Cattaneo, Roberto; Russell, Stephen J

2004-02-15

481

Greasing Membrane Fusion and Fission Machineries  

Microsoft Academic Search

Biological membrane fusion is a local-point event, ex- tremely fast, and under strict control. Proteins are re- sponsible for the mutual recognition of the fusion partners and for the initiation of biomembrane fusion, and thus determine where and when fusion occurs. However, the central event during membrane fusion is the merger of two membranes, which requires a tran- sient reorganization

Koert N. J. Burger

2000-01-01

482

An introduction to controlled thermonuclear fusion  

Microsoft Academic Search

Aspects of background theory are examined, taking into account fission, fusion, the mass defect, the energy release, the Coulomb barrier, possible fusion reactions of interest, fusion in colliding beams of particles, fusion of particles with random thermal motion, the magnetic confinement of the plasma, and radiation losses from a plasma. Controlled fusion reactors are discussed, giving attention to plasma parameters

M. O. Hagler; M. Kristiansen

1977-01-01

483

Critical distance in fusion reactions  

SciTech Connect

The rapid descent of the fusion cross section for lighter heavy-ion systems at higher energies is interpreted in terms of a fusion entry line based on a new concept of the critical distance between heavy ions. This model reproduces well experimental data with one parameter; h..omega../sub d/ = (0.70 +- 0.05)40A/sup -1/3/. The appearance of an angular momentum window in incomplete fusions is demonstrated for ..cap alpha..+ /sup 233/U.

Matsuse, T.; Arima, A.; Lee, S.M.

1982-11-01

484

Directions for improved fusion reactors  

Microsoft Academic Search

Conceptual fusion reactor studies over the past 10 to 15 years have projected systems that may be too large, complex, and costly to be of commercial interest. One main direction for improved fusion reactors points towards smaller, higher-power-density approaches. First-order economic issues (i.e., unit direct cost and cost of electricity) are used to support the need for more compact fusion

R. A. Krakowski; R. L. Miller; J. G. Delene

1986-01-01

485

Piezoelectric wave motor  

DOEpatents

A piezoelectric motor having a stator in which piezoelectric elements are contained in slots formed in the stator transverse to the desired wave motion. When an electric field is imposed on the elements, deformation of the elements imposes a force perpendicular to the sides of the slot, deforming the stator. Appropriate frequency and phase-shifting of the electric field will produce a wave in the stator and motion in a rotor. In a preferred aspect, the piezoelectric elements are configured so that deformation of the elements in the direction of an imposed electric field, generally referred to as the d.sub.33 direction, is utilized to produce wave motion in the stator. In a further aspect, the elements are compressed into the slots so as to minimize tensile stresses on the elements in use.

Yerganian, Simon Scott (Lee' s Summit, MO)

2003-02-11

486

Graded motor imagery.  

PubMed

New information regarding cortical changes in patients with chronic pain has prompted a reevaluation of the typical "bottom up" treatment for pain, which focuses on peripheral nociceptive stimuli. More recently, increasing considerations for chronic pain are focused from the "top down" cortical central processing perspective. Graded motor imagery (GMI) is one treatment technique from the "top down" paradigm designed to treat chronic pain. This technique attempts to sequentially normalize central processing to remediate chronic pain. This article briefly summarizes the basic components of GMI, targeting complex regional pain in the upper limb, and describes a case where this method was successfully integrated. The initial research and clinical experience is promising and indicates that patients with chronic pain may benefit from using GMI to "retrain the brain." PMID:21306870

Priganc, Victoria W; Stralka, Susan W

2011-02-09

487

[Regulation of motor behaviour].  

PubMed

The review is devoted to analysis of the basic links of motor behavior control systems: sensorimotor cortex, cerebellum, a red nucleus and striatum. The organization and communications of these structures and their participation in learning and memory processes are described. The synaptic neurotransmitter and nonsynaptic neuromodulatory systems innervating these structures are also described. Hierarchical synaptic networks are formed by GABA and glutamatergic systems. The nonsynaptic dopaminergic system innervates both of these structures, but carries out a modulatory function. The mesocorticolimbic dopaminergic system induces an emotional and motivational state - processes of reinforcement, and participates in realization of purposeful behavior. The nigrostriatal dopaminergic system, through triggering an endocellular signal and the processes ofphosphorylation and dephosphorylation modulates activity ofGABA and glutamatergic receptors ofdorsal striatum spiny neurons and adapted thalamocortical networks. PMID:21950009

Bazian, A S; Grigir'ian, G A; Ioffe, M E

488

Piezoelectric wave motor  

DOEpatents

A piezoelectric motor having a stator in which piezoelectric elements are contained in slots formed in the stator transverse to the desired wave motion. When an electric field is imposed on the elements, deformation of the elements imposes a force perpendicular to the sides of the slot, deforming the stator. Appropriate frequency and phase shifting of the electric field will produce a wave in the stator and motion in a rotor. In a preferred aspect, the piezoelectric elements are configured so that deformation of the elements in direction of an imposed electric field, generally referred to as the d.sub.33 direction, is utilized to produce wave motion in the stator. In a further aspect, the elements are compressed into the slots so as to minimize tensile stresses on the elements in use.

Yerganian, Simon Scott (Lee' s Summit, MO)

2001-07-17

489

Magnetostrictive roller drive motor  

NASA Astrophysics Data System (ADS)

A magnetostrictive drive motor is disclosed which has a rotary drive shaft in the form of a drum which is encircled by a plurality of substantially equally spaced roller members in the form of two sets of cones which are in contact with the respective cam surfaces on the inside surface of an outer drive ring. The drive ring is attached to sets of opposing pairs of magnetostrictive rods. Each rod in a pair is mutually positioned end to end within respective energizing coils. When one of the coils in an opposing pair is energized, the energized rod expands while the other rod is caused to contract, causing the drive ring to rock, i.e., rotate slightly in either the clockwise or counterclockwise direction, depending upon which rod in a pair is energized. As the drive ring is activated in repetitive cycles in either direction, one set of drive cones attempts to roll up their respective cam surface but are pinned between the drive shaft drum and the drive ring. As the frictional force preventing sliding builds up, the cones become locked, setting up reaction forces including a tangential component which is imparted to the drive shaft drum to provide a source of motor torque. Simultaneously the other set of cones are disengaged from the drive shaft drum. Upon deactivation of the magnetostrictive rod coils, the force on the drive cones is released, causing the system to return to an initial rest position. By repetitively cycling the energization of the magnetostrictive rods, the drive shaft drum indexes in microradian rotational steps.

Vranish, John M.

1992-01-01

490

Economic potential of inertial fusion  

SciTech Connect

Beyond the achievement of scientific feasibility, the key question for fusion energy is: does it have the economic potential to be significantly cheaper than fission and coal energy. If fusion has this high economic potential then there are compelling commercial and geopolitical incentives to accelerate the pace of the fusion program in the near term, and to install a global fusion energy system in the long term. Without this high economic potential, fusion's success depends on the failure of all alternatives, and there is no real incentive to accelerate the program. If my conjectures on the economic potential of inertial fusion are approximately correct, then inertial fusion energy's ultimate costs may be only half to two-thirds those of advanced fission and coal energy systems. Relative cost escalation is not assumed and could increase this advantage. Both magnetic and inertial approaches to fusion potentially have a two-fold economic advantage which derives from two fundamental properties: negligible fuel costs and high quality energy which makes possible more efficient generation of electricity. The wining approach to fusion may excel in three areas: electrical generating efficiency, minimum material costs, and adaptability to manufacture in automated factories. The winning approach must also rate highly in environmental potential, safety, availability factor, lifetime, small 0 and M costs, and no possibility of utility-disabling accidents.

Nuckolls, J.H.

1984-04-01

491

The path to fusion power†  

PubMed Central

The promise, status and challenges of developing fusion power are outlined. The key physics and engineering principles are described and recent progress quantified. As the successful demonstration of 16?MW of fusion in 1997 in the Joint European Torus showed, fusion works. The central issue is therefore to make it work reliably and economically on the scale of a power station. We argue that to meet this challenge in 30 years we must follow the aggressive programme known as the ‘Fast Track to Fusion’. This programme is described in some detail.

Smith, Chris Llewellyn; Cowley, Steve

2010-01-01

492

Forcing free fusion of stereograms.  

PubMed

n order to read articles that either are on stereopsis, or use stereopsis as a tool, it is virtually inescapable to learn to fuse stereograms without the help of a stereoscope or special glasses (free fusion). For a few, this is easy. For many, it is frustratingly difficult, leading some to turn their backs on stereopsis altogether. Here, we show how presenting a stereogram on a transparency-rather than on paper-with a fixation cross behind it (for uncrossed fusion), or presenting a fixation cross on a transparency with a paper stereogram behind it (for crossed fusion), can force free fusion towards greater success. PMID:20301854

Cecchetto, Stefano; Kramer, Peter

2010-01-01

493

Stockpile tritium production from fusion  

SciTech Connect

A fusion breeder holds the promise of a new capability - ''dialable'' reserve capacity at little additional cost - that offers stockpile planners a new way to deal with today's uncertainties in forecasting long range needs. Though still in the research stage, fusion can be developed in time to meet future military requirements. Much of the necessary technology will be developed by the ongoing magnetic fusion energy program. However, a specific program to develop the nuclear technology required for materials production is needed if fusion is to become a viable option for a new production complex around the turn of the century.

Lokke, W.A.; Fowler, T.K.

1986-03-21

494

MECHANISMS OF ACQUIRED RESISTANCE IN MOUSE TYPHOID  

PubMed Central

Experiments in vitro comparing normal mouse peritoneal macrophages with cells from Salmonella typhimurium-infected mice have shown that the "immune" macrophages have conspicuously enhanced microbicidal properties. Whereas normal macrophages could inactivate only 50 to 60% of intracellular S. typhimurium pretreated with immune serum, cells from infected animals killed virtually all ingested organisms and did so at an accelerated rate. Macrophages from Listeria monocytogenes-infected mice were shown to possess similarly enhanced microbicidal activity against S. typhimurium. Furthermore, the growth of S. typhimurium in the liver and spleen was more effectively restricted in Listeria-infected mice than in animals vaccinated with heat-killed S. typhimurium, even though the Listeria-infected animals possessed no demonstrable cross-reacting antibody to S. typhimurium. The lack of resistance in the mice vaccinated with heat-killed organisms could not be attributed to any deficiency of humoral factors, since the serum from these animals was as effective at promoting phagocytosis and killing by macrophages as serum from actively infected (and demonstrably resistant) mice. Conversely, Salmonella-infected mice were totally resistant to intravenous challenge with L. monocytogenes. The level of resistance in individual animals was related to the numbers of residual Salmonellae remaining in the tissues; mice with heavier residual infections being the more resistant. Specific antiserum from mice vaccinated with heat-killed S. typhimurium was found to be significantly protective only when the intraperitoneal route of challenge was employed. The foregoing studies have been interpreted to mean that enhancement of the microbicidal ability of macrophages is the mechanism of major importance in acquired resistance to S. typhimurium infection in mice.

Blanden, R. V.; Mackaness, G. B.; Collins, F. M.

1966-01-01

495

Community-acquired Stenotrophomonas maltophilia infections: a systematic review  

Microsoft Academic Search

Stenotrophomonas maltophilia is a pathogen that causes infections mainly in immunocompromised patients. However, community-acquired S. maltophilia infections have been occasionally reported. The objective of this paper was to collect and evaluate the available published\\u000a data referring to community-acquired S. maltophilia infections. We searched PubMed, the Cochrane Library, and Scopus for articles providing data for patients with community-acquired\\u000a S. maltophilia infections.

M. E. Falagas; A. C. Kastoris; E. K. Vouloumanou; G. Dimopoulos

2009-01-01

496

Hospital acquired rotavirus infections: burden in Canadian paediatric hospitals  

Microsoft Academic Search

Rotavirus infections are one of the most common hospital acquired infections in pediatric hospitals. Laboratory confirmed hospital acquired rotavirus infections from 12 pediatric hospitals in Canada were documented for a 3 year period, 2005-7. Overall, hospital acquired infections represented one quarter of all rotavirus hospitalizations for an annual rate of 0.45 per 1000 hospital days with a peak of 0.68

Nicole Le Saux; Julie Bettinger; Scott Halperin; Wendy Vaudry; David Scheifele

2011-01-01

497

Hospital-acquired infections: are prevention strategies matching incidence rates?  

Microsoft Academic Search

The threat of hospital-acquired infections, although known, continues to rise. Are hospitals setting guidelines in order to prevent hospital infections? If so, arethe setguidelines effective? A study conducted across three hospitals showed asignificant drop in the rates of surgical site infections (SSI) and hospital-acquired urinary tract infection (UTI) by increasing the awareness of hospital-acquired infections among healthcare workers. An education

Joyce B. Suchitra; Nanjaiah Lakshmidevi

2009-01-01

498

Motor unit types of cat triceps surae muscle  

PubMed Central

1. Motor units, defined as including a motoneurone (cell body, dendrites and axon) plus the muscle unit innervated, have been examined in the triceps surae motor pool of pentobarbital anaesthetized cats. 2. The technique of intracellular stimulation and recording which was used permitted measurement of the axonal conduction velocity, post-spike hyperpolarization duration and input resistance of individual motoneurones, and the correlation of these properties with the characteristics of the twitch and tetanus responses of the muscle unit innervated by the cell elicited by direct intracellular stimulation. 3. On the basis of muscle unit speed of contraction, motor units were divided into two groups: (a) fast twitch, or F, type with twitch time to peak (TwTp) less than or equal to 30 msec, and (b) slow twitch, or S, type with TwTp of 40 msec or greater. The twitch tensions (TwTen) produced by type F units were significantly larger (median value = 18 g) than the tensions generated by type S units (TwTen median value = 1·6 g). Type F muscle units had much higher tetanus fusion frequencies (median = 85 pulses/sec) than the S type (median 25 pulses/sec), and tended to have smaller tetanus to twitch tension ratios (Tet/Tw) (median = 2·6) than type S units (median = 5·4). 4. The gastrocnemius heads contained a mixture of F and S types of muscle units, the proportions found being about 3 to 1 respectively. Units encountered in the soleus muscle were uniformly of type S. The characteristics of gastrocnemius and soleus type S motor units were not identical but appeared to represent quantitative differences in units of the same qualitative type. 5. Motoneurones innervating type F muscle units had faster axonal conduction velocities, shorter post-spike hyperpolarizations and lower input resistances than those supplying type S units. However, no combination of motoneurone properties alone was sufficient to separate unambiguously types F and S motor units.

Burke, Robert E.

1967-01-01

499

Fusion of Multiple Facial Features for Age Estimation  

NASA Astrophysics Data System (ADS)

A novel age estimation method is presented which improves performance by fusing complementary information acquired from global and local features of the face. Two-directional two-dimensional principal component analysis ((2D)2PCA) is used for dimensionality reduction and construction of individual feature spaces. Each feature space contributes a confidence value which is calculated by Support vector machines (SVMs). The confidence values of all the facial features are then fused for final age estimation. Experimental results demonstrate that fusing multiple facial features can achieve significant accuracy gains over any single feature. Finally, we propose a fusion method that further improves accuracy.

Lu, Li; Shi, Pengfei

500

Fusion materials irradiations at MaRIE'S fission fusion facility  

Microsoft Academic Search

Los Alamos National Laboratory's proposed signature facility, MaRIE, will provide scientists and engineers with new capabilities for modeling, synthesizing, examining, and testing materials of the future that will enhance the USA's energy security and national security. In the area of fusion power, the development of new structural alloys with better tolerance to the harsh radiation environments expected in fusion reactors

Eric J. Pitcher

2011-01-01