— the spin echo

Báo cáo hóa học: " Field Dependence of the Spin Relaxation Within a Film of Iron Oxide Nanocrystals Formed via Electrophoretic " pptx

Ngày tải lên : 21/06/2014, 17:20

... K, and the magnetization is recorded as the sample warms to 350 K The procedure for the FC measurement is similar, except the sample is cooled in the presence of a small external field For the ZFC ... which the macrospins relax on the order of s & 100 s [26] As depicted in Fig 5, TSP & B 190 K for the parallel applied field, while TSP & 217 K B for the perpendicular applied field The thermal ... assemblies, where the distance between NCs is governed by the length of the organic capping molecules (d & 1–2 nm) Therefore, it is reasonable to presume that the magnetic properties of the NCs are...

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Báo cáo nghiên cứu khoa học: "THEORETICAL STUDY OF THE SPIN DENSITY DISTRIBUTION OF THE GREEN TEA CATECHIN RADICALS" doc

Ngày tải lên : 22/07/2014, 10:21

... and β spin: ρ(1) = ρα (1) + ρβ (1) (ρα (1), ρβ (1) corresponds to the probability density of finding an electron with α and β spin at the position r1) The radical will be stable as the spin densities ... tea catechins The study has concerned the determination of the max spin density according to the stability of radicals and their scavenging activity In solution and gas phase, the minimum of ... with the maximum spin density – MSD at every atom of radical is small At the doublet state, sum of spin densities is In this paper, we have investigated at the density functional level of the...

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Báo cáo khoa học: "Words and Echoes: Assessing and Mitigating the Non-Randomness Problem in Word Frequency Distribution Modeling" ppt

Ngày tải lên : 17/03/2014, 04:20

... based on the empirical standard deviation of the ei across the 20 trials (the conﬁdence intervals are usually somewhat larger than the actual range of values found in the experiments, so they should ... (rather than document sampling), so that the LNRE models can be applied “as is” to echo- adjusted corpora Echo- adjustment does not affect the sample size N nor the vocabulary size V , making the ... word in the same document with echo tokens, and estimate the parameters of a plain LNRE model with the resulting version of the training corpus 4.3 Experiments with echo adjustment Using the same...

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Báo cáo toán học: " Spin-related tunneling through a nanostructured electric-magnetic barrier on the surface of a topological insulator" potx

Ngày tải lên : 20/06/2014, 20:20

... electrons are spin polarized along the direction of the vector (π × z), the magnetic field bends the trajectory of the electrons, resulting in a rotation of the spin of the transmitted electrons The reflected ... Our results demonstrate that the magnetic field of the magnetic barrier bends the trajectory of the electrons, and therefore rotate the spin Theory First we focus on the electron transmission through ... shows the spin orientation as a function of the incident angles and the incident energies From the spin orientation one can see that the transmitted electron spins are polarized along the same...

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Báo cáo hóa học: " Electron-Spin Precession in Dependence of the Orientation of the External Magnetic Field" docx

Ngày tải lên : 22/06/2014, 00:20

... directed along the spin of the hole (parallel to the longitudinal axis, here k) acting on the electron spin The speed and direction of the electron -spin precession are determined by the total ﬁeld ... determined by the orientation of the electron spin with respect to the direction of observation, optical excitation aligns the electron spin along the longitudinal (k) axis When the electron -spin precesses ... seen that the theoretic curve agrees well with the experimental data The dependence of the oscillation decay rate on the orientation of the magnetic ﬁeld is shown in Fig As can be seen, the change...

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Báo cáo hóa học: " Research Article Optimum Detection of Ultrasonic Echoes Applied to the Analysis of the First Layer of a Restored Dome" pot

Ngày tải lên : 22/06/2014, 19:20

... of the pulse in the go and return path through the first layer Besides, it will be affected by the surface and by the pressure on the transducer in the manual measurement In detection theory, the ... Finally, the vector s, which represents the form of the pulse to be detected, depends on the pulse arriving at the possible reflector, which, due to the propagation effects, is a distorted version of the ... noise could be considered the result of the superposition of many echoes coming from the material grains, that is, the result of convolving the material reflectivity with the ultrasonic pulse sent...

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Báo cáo hóa học: " Split SR-RLS for the Joint Initialization of the Per-Tone Equalizers and Per-Tone Echo Cancelers in DMT-Based Receivers" doc

Ngày tải lên : 23/06/2014, 01:20

... Here, the row vector hE represents the overall echo channel and U(k) are the transmitted echo symbols Again, the matrices 0(3,4) are zero matrices of appropriate dimension [13] Now, define the echo ... where vE,i is the TEC -taps echo canceler for tone i and ∆r(k) , (k) , R(k) , and U (k) are the T ˜i ∆u EQ − difference terms of the i received signal, the TEC − difference terms of the echo reference ... κ = 8) The PSD on the transmitted upstream and downstream tones are −38 dBm/Hz and −40 dBm/Hz, respectively The echo and far-end channels include the transmission loop together with all the transmit...

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Putting a New Spin on Groups The Science of Chaos docx

Ngày tải lên : 28/06/2014, 08:20

... parallel to the building leading to the front door Between the ramp and the building there is a small, narrow space The mother led herfawn into the space and then left the camp For two days, the young ... direction or another or entices the group to retreat Throughout the book, the strands of these ideas as well as others are woven together using chaos theory Although the application of chaos theory to ... deer would be cared for, but the call was not necessary Just before the retreat ended, the mother returned, gathered herfawn, and the two of them headed into the forest The nature of this event and...

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Báo cáo toán học: "Bounding the partition function of spin-systems" ppsx

Ngày tải lên : 07/08/2014, 13:21

... product over the vertices of G of the weights of the spins times the product over the edges of G of the weights of the spin- pairs In this language Z W (G) is the partition function of the the electronic ... think of the weights λ·,uv as a measure of the likelihood of seeing the different spin- pairs across the edge uv The probability of a particular spin conﬁguration is thus proportional to the product ... {1, , m} as the set of possible spins that a particle may take For each v ∈ V we think of the weights λ·,v as a measure of the likelihood of seeing the different spins at v; furthermore, for...

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Báo cáo y học: "Histone tales: echoes from the past, prospects for the future" ppt

Ngày tải lên : 09/08/2014, 20:21

... Functionally, these changes correlate with a longer mean life span and a larger brood size in the postdauer stage animals Although the authors [5] not directly demonstrate which of these genes causes the ... In a nutshell, the dauer-induced chromatin modeling did not lead per se to changes in gene expression but paved the way for these changes on a site-specific scale To test the hypothesis that dauer-induced ... in cellular memory formation and whether distinct environmental signals operate at these different scales The findings [5] also provoke the question of whether such graded memory formation in...

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Báo cáo y học: "The accuracy of echocardiography versus surgical and pathological classification of patients with ruptured mitral chordae tendineae: a large study in a Chinese cardiovascular center" ppt

Ngày tải lên : 10/08/2014, 09:22

... replacement included a mechanical prosthetic valve and bioprosthetic valve The method of choosing the type of surgical method depended on the location of the ruptured chordae tendineae (P < 0.01), ... and the incidence of valvular thickening combined with AV damage in the CRV group was higher than that in the other groups Infective endocarditis patients were younger than those in the other ... other groups, and there was a higher incidence of abnormal echo than in the other groups (Table and Figure 1) With regard to structure and hemodynamic changes, compared other groups, the CRV group...

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Báo cáo y học: "A successfully thrombolysed acute inferior myocardial infarction due to type A aortic dissection with lethal consequences: the importance of early cardiac echocardiography" ppsx

Ngày tải lên : 10/08/2014, 09:22

... via the left main coronary artery The procedure took place under systematic hypothermia (25°C) After the opening of the aorta the diagnosis of a type A aortic dissection was confirmed with the ... operation: The origin of the right coronary artery from the false lumen (black arrow), the false lumen (white arrow), the intimal flap (arrow head) and the venous cannula inserted in the right ... a coronary spasm was the cause of the STEMI, due to nearby hematoma or pressure of the false lumen which resolved with the use of the adjuvant therapy, such as nitrates The followed inappropriate...

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Báo cáo khoa học: " Preliminary reference values for electrocardiography, echocardiography and myocardial morphometry in the European brown hare (Lepus europaeus)" pps

Ngày tải lên : 12/08/2014, 18:22

... http://www.actavetscand.com/content/51/1/6 was measured from the beginning of the rise to the end of the decrease in the record line PQ (PR) interval was measured from the beginning of P wave to the beginning of QRS complex ... ventricle, thickness of the interventricular septum and of the free wall in the left and right ventricle below the atrio-ventricular valves (similar to the site of measurement in echocardiographic ... out of ECG and echocardiographic examinations, calculated the parameters, and drafted the manuscript JN participated in the drafting and revised the content critically MN performed the histopathological...

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Báo cáo khoa học: "Echocardiography and assessing fluid responsiveness: acoustic quantification again into the picture" pptx

Ngày tải lên : 13/08/2014, 03:20

... First, despite the careful implementation of passive leg raising, a small shift or displacement of the TOE probes in relation to the LV short axis could distort the findings significantly The analysis ... manner at the bedside Competing interests The author(s) declare that they have no competing interests Acknowledgements Work conducted by the authors is supported by an unrestricted grant from the International ... predictor of fluid responsiveness only if tidal volume was more than ml/kg Further investigation is necessary to reveal whether the observations reported by Cannesson and coworkers [1] are also valid...

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Báo cáo khoa học: "Is tissue Doppler echocardiography the Holy Grail for the intensivist" potx

Ngày tải lên : 13/08/2014, 03:21

... signals suggests that the septal signals are apparently more sensitive to preload alterations The reader, however, should bear in mind that the stability of the signals obtained at the septal side ... of the E′ wave in a rather small subset of intensive care unit patients, and again several issues have to be kept in mind First, several of the study patients were supported by a vasopressor The ... colleagues [6] The number of intensive care unit patients included in this subset is again far too small to conclude in a proper manner From all these studies, it is unclear whether the discussed...

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Báo cáo y học: " Recently published papers: A review of novel strategies in the prevention of hospital-acquired infections, the ability of intensivists to perform echocardiography, and the benefit of polymyxin B haemoperfusion in abdominal sepsis" pot

Ngày tải lên : 13/08/2014, 18:22

... in the treatment group and a resultant increase in early survival data Despite their early withdrawal from the study the authors call for larger multicentred studies to confirm their findings The ... early physical and occupational therapy can reduce the duration of time on a ventilator, and can thereby reduce the mortality associated with this intervention [9] They performed a dualcentre randomised ... for the intensivists to study in their own time The study group comprised 44 patients in whom the intensivists were asked to first identify normal or abnormal left ventricular function and then...

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Báo cáo y học: " Echocardiography: a help in the weaning process" pot

Ngày tải lên : 13/08/2014, 20:22

... to the deconnection from the ventilator on a T-piece, and subsequently at the end of the SBT (i.e., before the planned extubation or before the reconnection to the ventilator required by the ... wave) was measured, and the E/A ratio was computed The deceleration time of the E wave (DTE) was measured in extending the deceleration slope from the peak wave velocity to the zero-velocity baseline ... performed The attending physician in charge of the patient did not have access to TTE results All patients were included at the time of their first SBT Failure to wean a patient from the ventilator...

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Báo cáo y học: "Transthoracic echocardiography for the diagnosis of left ventricular thrombosis in the postoperative care unit" ppt

Ngày tải lên : 14/08/2014, 07:21

... visualization of the thrombi was observed in the apical four-chamber view, the apical two-chamber view and the parasternal short-axis view In one of the cases, the thrombus was also visualized in the parasternal ... structure in the apex of the left ventricle Therefore, full-dose anticoagulant therapy was considered indispensable in avoiding the consequences of thrombus dislodgement into the bloodstream The sensitivity ... Transthoracic echocardiography of the left ventricle Thrombus (arrows) in the apex of the left ventricle is clearly depicted in the (A) short, (B) long parasternal axes as well as in the (C) apical...

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study of the stall-spin phenomena using analysis and interactive 3-d graphics

Ngày tải lên : 29/11/2014, 07:21

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