Rem Study of Current Effect on the Structure of Clean Si(111) Surface

1990 ◽  
Vol 48 (1) ◽  
pp. 306-307
Author(s):  
A. Yamanaka ◽  
H. Ohse ◽  
K. Yagi
Keyword(s):  
The Other ◽  
Current Direction ◽  
Clean Surface ◽  
Current Effect ◽  
Atomic Steps ◽  
Step Bunching ◽  
Terrace Width ◽  
Step Down ◽  
A Current

Recently current effects on clean and metal adsorbate surfaces have attracted much attention not only because of interesting phenomena but also because of practically importance in treatingclean and metal adsorbate surfaces [1-6]. In the former case, metals deposited migrate on the deposit depending on the current direction and a patch of the deposit expands on the clean surface [1]. The migration is closely related to the adsorbate structures and substrate structures including their anisotropy [2,7]. In the latter case, configurations of surface atomic steps depends on the current direction. In the case of Si(001) surface equally spaced array of monatom high steps along the [110] direction produces the 2x1 and 1x2 terraces. However, a relative terrace width of the two domain depends on the current direction; a step-up current widen terraces on which dimers are parallel to the current, while a step-down current widen the other terraces [3]. On (111) surface, a step-down current produces step bunching at temperatures between 1250-1350°C, while a step-up current produces step bunching at temperatures between 1050-1250°C [5].In the present paper, our REM observations on a current induced step bunching, started independently, are described.Our results are summarized as follows.(1) Above around 1000°C a step-up current induces step bunching. The phenomenon reverses around 1200 C; a step-down current induces step bunching. The observations agree with the previous reports [5].

DC-HEATING-INDUCED ANTIBAND FORMATION AND SUBSEQUENT STEP WANDERING ON Si(111) STUDIED BY IN-SITU REM

1999 ◽  
Vol 06 (06) ◽  
pp. 977-984 ◽  
Author(s):  
MASASHI DEGAWA ◽  
HIROKI MINODA ◽  
YASUMASA TANISHIRO ◽  
KATSUMICHI YAGI
Keyword(s):  
Electron Microscopy ◽  
Present Report ◽  
Current Direction ◽  
Vicinal Surfaces ◽  
Step Bunching ◽  
Subsequent Step ◽  
Step Down ◽  
Scanning Electron

Direct current fed through a Si crystal with (111) vicinal surfaces induces step bunching and wandering which depend on the temperature and the current direction. In the present report in-situ reflection electron microscope studies of antiband formation and the growth of step wandering are presented together with supplemental observations by scanning electron microscopy and optical microscopy. Observations were for the temperature range (about 1000–1180°C) where the step-down current induces step wandering and the step-up current induces step bunching and antiband formation and subsequent step wandering. An important role of antiband formation for step wandering in the step-up current regions is presented.

Quantitative studies of step bunching dynamics on Si(111) induced by a current effect

1996 ◽  
Vol 357-358 ◽  
pp. 518-521 ◽  
Author(s):  
Takashi Senoh ◽  
Hiroki Minoda ◽  
Yasumasa Tanishiro ◽  
Katsumichi Yagi
Keyword(s):  
Current Effect ◽  
Step Bunching ◽  
Quantitative Studies ◽  
A Current

Ventricular fibrillation during uniform myocardial anoxia due to asphyxia

1960 ◽  
Vol 198 (5) ◽  
pp. 955-958 ◽  
Author(s):  
Jay D. Coffman ◽  
D. E. Gregg
Keyword(s):  
Cardiac Arrest ◽  
Ventricular Fibrillation ◽  
Potassium Level ◽  
Serum Potassium Level ◽  
Current Theory ◽  
The Other ◽  
Right Atrial ◽  
Serum Electrolytes ◽  
Anesthetized Dogs ◽  
A Current

Thirty-three anesthetized dogs of varying weights were subjected to complete asphyxia by tracheal occlusion to produce uniform anoxia of the heart. Eleven showed electrocardiographic evidence of ventricular fibrillation while the other twenty-two demonstrated cardiac arrest. The development of ventricular fibrillation correlated with the heavier body and heart weights and with a lower average right atrial serum potassium level as compared to the dogs not fibrillating. Other serum electrolytes, pH, body temperature and sex showed no correlation with the arrhythmia. The importance of the fact that large dogs have a greater susceptibility to develop ventricular fibrillation during uniform anoxia of the heart is discussed in relation to experimental research on dogs and to a current theory of the cause of ventricular fibrillation.

Statistics on Jupiter's Current Sheet with Juno Data: Geometry, Magnetic Fields and Energetic Particles

2021 ◽  
Author(s):  
Zhi-Yang Liu ◽  
Qiu-Gang Zong ◽  
Michel Blanc
Keyword(s):  
Magnetic Fields ◽  
Current Sheet ◽  
Power Law ◽  
Heavy Ions ◽  
Particle Interaction ◽  
The Other ◽  
Gaussian Functions ◽  
Fixed Energy ◽  
Thin Current Sheet ◽  
A Current

<p>Jupiter's magnetosphere contains a current sheet of huge size near its equator. The current sheet not only mediates the global mass and energy cycles of Jupiter's magnetosphere, but also provides an occurring place for many localized dynamic processes, such as reconnection and wave-particle interaction. To correctly evaluate its role in these processes, a statistical description of the current sheet is required. To this end, here we conduct statistics on Jupiter's current sheet, with four-year Juno data recorded in the 20-100 Jupiter radii, post-midnight magnetosphere. The results suggest a thin current sheet whose thickness is comparable with the gyro-radius of dominant ions. Magnetic fields in the current sheet decrease in power-law with increasing radial distances. At fixed energy, the flux of electrons and protons increases with decreasing radial distances. On the other hand, at fixed radial distances, the flux decreases in power-law with increasing energy. The flux also varies with the distances to the current sheet center. The corresponding relationship can be well described by Gaussian functions peaking at the current sheet center. In addition, the statistics show the flux of oxygen- and sulfur-group ions is comparable with the flux of protons at the same energy and radial distances, indicating the non-negligible effects of heavy ions on current sheet dynamics. From these results, a statistical model of Jupiter's current sheet is constructed, which provides us with a start point of understanding the dynamics of the whole Jupiter's magnetosphere.</p>

scholarly journals Cost-effective Analysis of Proton Pump Inhibitors in Long-term Management of Gastroesophageal Reflux Disease: A Narrative Review

2019 ◽  
Vol 55 (5) ◽  
pp. 292-305
Author(s):  
Shazia Jamshed ◽  
Akshaya Srikanth Bhagavathula ◽  
Sheikh Muhammad Zeeshan Qadar ◽  
Umaira Alauddin ◽  
Sana Shamim ◽  
...  
Keyword(s):  
Cost Effectiveness ◽  
Gastroesophageal Reflux Disease ◽  
Cost Effective ◽  
The Other ◽  
Cost Effectiveness Ratio ◽  
On Demand ◽  
Step Down ◽  
The Cost ◽  
Term Management

Background: Gastroesophageal reflux disease (GERD) is a common gastrointestinal disorder that results from regurgitation of acid from the stomach into the esophagus. Treatment available for GERD includes lifestyle changes, antacids, histamine-2 receptor antagonists (H2RAs), proton pump inhibitors (PPIs), and anti-reflux surgery. Aim: The aim of this review is to assess the cost-effectiveness of the use of PPIs in the long-term management of patients with GERD. Method: We searched in PubMed to identify related original articles with close consideration based on inclusion and exclusion criteria to choose the best studies for this narrative review. The first section compares the cost-effectiveness of PPIs with H2RAs in long-term heartburn management. The other sections shall only discuss the cost-effectiveness of PPIs in 5 different strategies, namely, continuous (step-up, step-down, and maintenance), on-demand, and intermittent therapies. Results: Of 55 articles published, 10 studies published from 2000 to 2015 were included. Overall, PPIs are more effective in relieving heartburn in comparison with ranitidine. The use of PPIs in managing heartburn in long-term consumption of nonsteroidal anti-inflammatory drug (NSAID) has higher cost compared with H2RA. However, if the decision-maker is willing to pay more than US$174 788.60 per extra quality-adjusted life year (QALY), then the optimal strategy is traditional NSAID (tNSAID) and PPIs. The probability of being cost-effective was also highest for NSAID and PPI co-therapy users. On-demand PPI treatment strategy showed dominant with an incremental cost-effectiveness ratio of US$2197 per QALY gained and was most effective and cost saving compared with all the other treatments. The average cost-effectiveness ratio was lower for rabeprazole therapy than for ranitidine therapy. Conclusion: Our review revealed that long-term treatment with PPIs is effective but costly. To achieve long-term cost-effective approach, we recommend on-demand approach to treat heartburn symptoms, but if the symptoms persist, treatment with continuous step-down therapy should be applied.

Spanish Morphophonology

2011 ◽  
Vol 4 (1) ◽  
Author(s):  
Sonia Colina
Keyword(s):  
The Other ◽  
Current View ◽  
Phonological Processes ◽  
Other Hand ◽  
Word Classes ◽  
Active Phenomenon ◽  
A Current ◽  
Sizable Number

AbstractIn recent years a sizable number of morphophonological phenomena have attracted considerable attention from Spanish phonologists. This article presents a current view of the controversies within the context of two recurring topics: the validity of morphophonological generalizations and the interaction of morphological and phonological processes. Some of the processes discussed are velar and coronal softening, diphthongization, word-classes, stem formatives, nasal depalatalization, diminutive formation and the nature of final -e. It is shown that some phenomena cannot be said to be synchronically active (i.e. coronal and velar softening, final epenthesis, diphthongization, and depalatalization), consisting instead of lexicalized alternants. Plural epenthesis, on the other hand, is argued (contra Bonet) to be an active phenomenon. Pluralization and diminutive formation are said to be morphophonological, not just phonological. Finally, the article addresses the connection between the interaction of morphological and phonological processes to the design of the morphophonological component of the grammar, introducing the issue of a derivational element in non-derivational models of phonology.

On some Relations between Magnetism and Twist. Parts II., III

1892 ◽  
Vol 18 ◽  
pp. 318-319
Author(s):  
Cargill G. Knott
Keyword(s):  
The Other ◽  
Close Connection ◽  
Rectangular Section ◽  
Nickel Iron ◽  
Other Hand ◽  
High Fields ◽  
Very High ◽  
A Current

Part II. contains a continuation of former experiments on the twists produced in the magnetic metals when they are under the combined influence of circular and longitudinal magnetisations.It is established that a cobalt rod of rectangular section twists left-handedly when a current is passed along it in the direction of magnetisation. That is, cobalt behaves like nickel. Iron, on the other hand, twists right-handedly, until very high fields are employed. These results seem to have a close connection with the magnetic changes of length in these metals; for iron expands in moderate fields, while nickel and cobalt contract, the former always, and the latter till high fields are reached.

Morphological and functional aspects of two different types of hair cells in the goldfish sacculus

1989 ◽  
Vol 62 (6) ◽  
pp. 1330-1343 ◽  
Author(s):  
I. Sugihara ◽  
T. Furukawa
Keyword(s):  
Cell Body ◽  
Hair Cells ◽  
The Other ◽  
Resting Potential ◽  
K Channel ◽  
Short Hair ◽  
Current Clamp ◽  
Other Hand ◽  
Inwardly Rectifying ◽  
A Current

1. With the use of whole-cell mode of the patch-clamp method, we examined the electrical responses of hair cells enzymatically isolated from the goldfish sacculus. 2. Hair cells from the rostral saccule had a short cell body and were ovoidal or eggplantlike in shape, whereas hair cells from the caudal saccule had a variable shape. Many had a longer cell body and were cylindrical or gourd-like in shape, but some short hair cells were also present in the caudal saccule. 3. The short hair cells had a resting potential of about -75 mV. In current-clamp experiments, these hair cells elicited damped oscillatory-potential changes of a relatively small amplitude in response to a depolarizing current. A current in the opposite direction produced a slow hyperpolarization, much larger in amplitude. 4. Resonant frequency of the short, or the oscillatory, type of hair cells ranged from 40 to 200 Hz or higher. However, resonance was generally of a poor quality as compared with that noted for hair cells in the turtle cochlea or frog sacculus. 5. The long hair cells had a resting potential of -90 to -100 mV. In current-clamp experiments, these hair cells elicited an all-or-none spike approximately 50 mV in amplitude in response to a depolarizing current. The spike was usually followed by a plateau, which was maintained for the duration of the depolarizing pulse. In some hair cells, damped slow oscillatory waves were evoked at a rate of 5-15 Hz. On the other hand, a hyperpolarizing current produced potential changes much smaller in amplitude. 6. Voltage-clamp experiments showed that Ca2+-activated K+ channel and A-current, especially its high-threshold subclass, were involved in the generation of outward rectification in the oscillatory-type hair cells. On the other hand, Na+, in addition to Ca2+, was involved in the generation of spike in the spike-type hair cells. Spike potentials were elicited even in the presence of tetrodotoxin (TTX), but the rate of rise was slower as compared with the intact spikes. 7. The spike-type hair cells had an inwardly rectifying K+ channel similar to that noted in the tunicate egg and chick vestibular hair cell. However, the oscillatory-type hair cells had an inwardly rectifying channel similar to the hyperpolarization-activated current, Ih, of the rod inner segment, or sinoatrial nodal cell, or lacked the inwardly rectifying channel. Differences in the resting membrane potential between the oscillatory- and spike-type hair cells are probably related to differences in the inwardly rectifying channels. 8. Effects of sound stimulation were simulated by injecting a half-wave rectified sinusoidal current of various frequencies.(ABSTRACT TRUNCATED AT 400 WORDS)

scholarly journals XXVII. On the relative speed of the electric wave through submarine cables of different lengths, and a unit of speed for comparing electric cables by bisecting the electric wave

1863 ◽  
Vol 12 ◽  
pp. 211-216
Keyword(s):  
The Other ◽  
Relative Speed ◽  
Submarine Cable ◽  
Electric Wave ◽  
Retarding Effect ◽  
The Earth ◽  
Current Flows ◽  
Electric Cables ◽  
Submarine Cables ◽  
A Current

The present paper gives the results of some experiments which were undertaken to determine, first, the relative speed of the electric wave through cables of various lengths; secondly, the retarding effect of the iron covering of the cable; and thirdly, methods for the increase of the speed of the electric wave. When a long submarine cable or subterranean wire is connected at one end through a galvanometer to the earth, and the other end is connected with a battery, a current flows through it, deflecting the galvanometer-needle.

Social Dimensions of Epistemological Disputes: The Case of Literary Theory

1997 ◽  
Vol 40 (2) ◽  
pp. 243-263
Author(s):  
Mark A. Schneider
Keyword(s):  
Literary Theory ◽  
Fine Arts ◽  
The Other ◽  
Organizational Forms ◽  
Human Sciences ◽  
Social Dimensions ◽  
The Arts ◽  
A Current ◽  
Academic Study

Epistemological reflection has been a major source of innovation in the human sciences while having very little influence on the arts or sciences. This variation is explained using a sociological framework emphasizing the organizational forms that underpin or are implicit in epistemological positions. The fine arts and the harder sciences are, respectively, too weakly and too strongly organized to be open to epistemological influence. By contrast, the human sciences might plausibly be organized either more loosely or more tightly, and epistemological argument is used in part to urge movement in one or the other direction. This perspective is applied to the academic study of literature both historically and in relation to a current epistemological dispute between realist and relativist scholars. The argument is unresolvable in practice, it is argued, because of constraints on scholarly interpretation set by consumers. Parallels are drawn with circumstances in sociology.

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