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Journal articles on the topic 'Q-V'

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Published: 4 June 2021

Last updated: 8 February 2022

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1

Melakhessou, A., K. Guenda, T. A. Gulliver, M. Shi, and P. Solé. "On codes over $$\mathbb {F}_{q}+v\mathbb {F}_{q}+v^{2}\mathbb {F}_{q}$$ F q + v F q + v 2 F q." Journal of Applied Mathematics and Computing 57, no. 1-2 (May 11, 2017): 375–91. http://dx.doi.org/10.1007/s12190-017-1111-6.

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2

Helmstetter, Jacques. "Universal Algebras $${\mathcal{U}(V,Q)}$$ U ( V , Q ) for Quadratic Mappings $${Q:V \rightarrow V}$$ Q : V → V." Advances in Applied Clifford Algebras 27, no. 2 (July 14, 2016): 1263–81. http://dx.doi.org/10.1007/s00006-016-0707-5.

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3

Tokics, Leif. "Radiospirometry V/Q." Acta Anaesthesiologica Scandinavica 35 (September 1991): 97–101. http://dx.doi.org/10.1111/j.1399-6576.1991.tb03405.x.

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4

Deakin, A. L., K. Parker, D. N. Burrell, C. Boivin, and P. J. Mountford. "85. Y/Q 4 a V/Q?" Nuclear Medicine Communications 15, no. 4 (April 1994): 248. http://dx.doi.org/10.1097/00006231-199404000-00088.

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5

Uren, R. "SPECT V/Q Scans." Journal of Nuclear Medicine 50, no. 4 (March 16, 2009): 654. http://dx.doi.org/10.2967/jnumed.108.059832.

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6

SHI, Minjia, Ting YAO, Adel ALAHMADI, and Patrick SOLÉ. "Skew Cyclic Codes over $\mathbb{F}_{q}+v\mathbb{F}_{q}+v^{2}\mathbb{F}_{q}$." IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E98.A, no. 8 (2015): 1845–48. http://dx.doi.org/10.1587/transfun.e98.a.1845.

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7

Ashraf, Mohammad, and Ghulam Mohammad. "On skew cyclic codes over $F_{q}+vF_{q}+v^2F_{q}$." Tbilisi Mathematical Journal 11, no. 2 (June 2018): 35–45. http://dx.doi.org/10.32513/tbilisi/1529460020.

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8

Hinks, F. "Trusts ineffective as testamentary dispositions: Q v Q [2010]." Trusts & Trustees 17, no. 3 (February 19, 2011): 219–21. http://dx.doi.org/10.1093/tandt/ttr019.

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9

Freeman, L. M., and M. D. Blaufox. "Reply: SPECT V/Q Scans." Journal of Nuclear Medicine 50, no. 4 (March 16, 2009): 654–55. http://dx.doi.org/10.2967/jnumed.108.060137.

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10

Ashraf, Mohammad, and Ghulam Mohammad. "Quantum codes from cyclic codes over $$F_q+uF_q+vF_q+uvF_q$$ F q + u F q + v F q + u v F q." Quantum Information Processing 15, no. 10 (July 11, 2016): 4089–98. http://dx.doi.org/10.1007/s11128-016-1379-8.

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11

Roach, Paul J., Denis J. Gradinscak, Geoffrey P. Schembri, Elizabeth A. Bailey, Kathy P. Willowson, and Dale L. Bailey. "SPECT/CT in V/Q Scanning." Seminars in Nuclear Medicine 40, no. 6 (November 2010): 455–66. http://dx.doi.org/10.1053/j.semnuclmed.2010.07.005.

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12

Pitaktonp, U., Z. Szabo, N. Ilgin, A. C. Civelek, and S. Sostre. "CONTOUR ANALYSIS OF V-Q SCANS." Clinical Nuclear Medicine 19, no. 10 (October 1994): 930. http://dx.doi.org/10.1097/00003072-199410000-00036.

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13

Larcos, G. "Non-diagnostic lung (V/Q) scans." Nuclear Medicine Communications 20, no. 4 (April 1999): 365. http://dx.doi.org/10.1097/00006231-199904000-00024.

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14

Bhakat, S. K., and P. DaS. "(ϵ ε v q)-fuzzy subgroup." Fuzzy Sets and Systems 80, no. 3 (June 1996): 359–68. http://dx.doi.org/10.1016/0165-0114(95)00157-3.

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15

Gutte, Henrik, Jann Mortensen, Claus Verner Jensen, Peter von der Recke, Claus Leth Petersen, Ulrik Sloth Kristoffersen, and Andreas Kjaer. "Comparison of V/Q SPECT and planar V/Q lung scintigraphy in diagnosing acute pulmonary embolism." Nuclear Medicine Communications 31, no. 1 (January 2010): 82–86. http://dx.doi.org/10.1097/mnm.0b013e3283336747.

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16

Deng, Tenghui, and Jing Yang. "Double Cyclic Codes over \({\mathbb{F}_{q}+v\mathbb{F}_{q}}\)." Mathematics 8, no. 10 (October 17, 2020): 1820. http://dx.doi.org/10.3390/math8101820.

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In this paper, an algebraic structure of a type of double cyclic codes is investigated, which covers some existing codes as special cases. The paper presents generic results about the generating polynomials, minimal generating sets, matrices and dual codes of the proposed codes.

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17

Khan, Asif, M. S. Mansoori, Khalid Khan, and M. Mursaleen. "Phillips-Type q -Bernstein Operators on Triangles." Journal of Function Spaces 2021 (February 19, 2021): 1–13. http://dx.doi.org/10.1155/2021/6637893.

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The purpose of the paper is to introduce a new analogue of Phillips-type Bernstein operators B m , q u f u , v and B n , q v f u , v , their products P m n , q f u , v and Q n m , q f u , v , their Boolean sums S m n , q f u , v and T n m , q f u , v on triangle T h , which interpolate a given function on the edges, respectively, at the vertices of triangle using quantum analogue. Based on Peano’s theorem and using modulus of continuity, the remainders of the approximation formula of corresponding operators are evaluated. Graphical representations are added to demonstrate consistency to theoretical findings. It has been shown that parameter q provides flexibility for approximation and reduces to its classical case for q = 1 .

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18

Rhodes, C. G., S. O. Valind, L. H. Brudin, P. E. Wollmer, T. Jones, and J. M. Hughes. "Quantification of regional V/Q ratios in humans by use of PET. I. Theory." Journal of Applied Physiology 66, no. 4 (April 1, 1989): 1896–904. http://dx.doi.org/10.1152/jappl.1989.66.4.1896.

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With positron emission tomography, quantitative measurements of regional alveolar and mixed venous concentrations of positron-emitting radioisotopes can be made within a transaxial section through the thorax. This allows the calculation of regional ventilation-to-perfusion (V/Q) ratios by use of established tracer dilution theory and the constant intravenous infusion of 13N. This paper considers the effect of the inspiration of dead-space gas on regional V/Q and investigates the relationship between the measured V/Q, physiological V/Q, and V/Q defined conventionally in terms of bulk gas flow (VA/Q). Ventilation has been described in terms of net gas transport, and the term effective ventilation has been introduced. A simple two-compartment model has been constructed to allow for the reinspiration of regional (or personal) and common dead-space gas. By use of this model, with parameters representative of normal lung the effective V/Q ratio for 13N [(VA/Q)eff(13N)] is shown to overestimate VA/Q by 18% when VA/Q = 0.1 but underestimate VA/Q by 68% when VA/Q = 10. For physiological gases, the model predicts that the behavior of O2 should be similar to that of 13N, so that, in terms of gas transport, V/Q ratios obtained using the infusion of 13N closely follow those for O2. Values of the effective V/Q ratio for CO2 [(VA/Q)eff(CO2)] lie approximately halfway between (VA/Q)eff(13N) and VA/Q. These results indicate that dead-space ventilation is far less a confounding issue when V/Q is considered in terms of net gas transport (VAeff), rather than bulk flow (VA).(ABSTRACT TRUNCATED AT 250 WORDS)

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19

Cárdenas, Esteban, Georgi Raikov, and Ignacio Tejeda. "Spectral properties of Landau Hamiltonians with non-local potentials." Asymptotic Analysis 120, no. 3-4 (October 30, 2020): 337–71. http://dx.doi.org/10.3233/asy-191591.

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We consider the Landau Hamiltonian H 0 , self-adjoint in L 2 ( R 2 ), whose spectrum consists of an arithmetic progression of infinitely degenerate positive eigenvalues Λ q , q ∈ Z + . We perturb H 0 by a non-local potential written as a bounded pseudo-differential operator Op w ( V ) with real-valued Weyl symbol V, such that Op w ( V ) H 0 − 1 is compact. We study the spectral properties of the perturbed operator H V = H 0 + Op w ( V ). First, we construct symbols V, possessing a suitable symmetry, such that the operator H V admits an explicit eigenbasis in L 2 ( R 2 ), and calculate the corresponding eigenvalues. Moreover, for V which are not supposed to have this symmetry, we study the asymptotic distribution of the eigenvalues of H V adjoining any given Λ q . We find that the effective Hamiltonian in this context is the Toeplitz operator T q ( V ) = p q Op w ( V ) p q , where p q is the orthogonal projection onto Ker ( H 0 − Λ q I ), and investigate its spectral asymptotics.

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20

Nyrén, Sven, Peter Radell, Margareta Mure, Johan Petersson, Hans Jacobsson, Sten G. E. Lindahl, and Alejandro Sánchez-Crespo. "Inhalation Anesthesia Increases V/Q Regional Heterogeneity during Spontaneous Breathing in Healthy Subjects." Anesthesiology 113, no. 6 (December 1, 2010): 1370–75. http://dx.doi.org/10.1097/aln.0b013e3181fc5788.

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Background The underlying mechanism for the increased alveolar-arterial oxygen tension difference resulting from almost all forms of general anesthesia is unknown. We hypothesized that inhalation anesthesia influences the intrapulmonary distribution of ventilation (V) and perfusion (Q), leading to less advantageous V/Q matching. Methods Ten healthy volunteers were studied in supine position on two separate occasions, once awake and once during mild anesthesia (sevoflurane inhalation) with maintained spontaneous breathing. On both occasions, the distribution of V and Q were simultaneously imaged using single photon emission computed tomography. V was tagged with [Tc]-labeled carbon particle aerosol and Q with [In]-labeled macroaggregates of human albumin. Atelectasis formation during anesthesia was prevented using low concentrations of oxygen in inhaled air. Results Mean V and Q distributions in the ventral-to-dorsal direction, measured in 20 equally spaced volumes of interest and in three regions of interest of equal volume, did not differ between conditions. Anesthesia, when compared with the awake state, significantly decreased the total heterogeneity of the Q distribution (P = 0.002, effect size 1.16) but did not alter V (P = 0.37, effect size 0.41). The corresponding V/Q total heterogeneity was higher under anesthesia (P = 0.002, effect size 2.64). Compared to the awake state, the V/Q frequency distribution under anesthesia became wider (P = 0.009, 1.76 effect size) with a tendency toward low V/Q ratios. Conclusion Inhalation anesthesia alone affects Q but not V, suggesting that anesthesia has a direct effect on the active regulatory mechanism coordinating Q with V, leading to less favorable V/Q matching.

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21

Goubi, Mouloud, Abdelmejid Bayad, and Mohand Hernane. "Explicit and asymptotic formulae for Vasyunin-cotangent sums." Publications de l'Institut Math?matique (Belgrade) 102, no. 116 (2017): 155–74. http://dx.doi.org/10.2298/pim1716155g.

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For coprime numbers p and q, we consider the Vasyunin-cotangent sum V(q, p)= ?p?1 k=1 {kq/p} cot (?k/p). First, we prove explicit formula for the symmetric sum V(p,q)+ V(q,p) which is a new reciprocity law for the sums above. This formula can be seen as a complement to the Bettin-Conrey result [13, Theorem 1]. Second, we establish an asymptotic formula for V(p,q). Finally, by use of continued fraction theory, we give a formula for V(p,q) in terms of continued fraction of p/q.

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22

Belhadj, Samir, and Mouloud Goubi. "On the Vasyunin Cotangent sums related to Riemann Hypothesis." WSEAS TRANSACTIONS ON MATHEMATICS 19 (February 9, 2021): 676–82. http://dx.doi.org/10.37394/23206.2020.19.74.

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In this work, we are interested by Vasyunin cotangent-sum V (p/q) encountered in computation of the inner product arising in the Baez-Duarte-Balazard criterion for Riemann hypothesis. By hint of generating functions theory and introduction of double Euclidean algorithm, we give series expansions of V (p/q) and the symmetric sum S (p, q) = V (p/q)+V (q/p). These calculus permit to deduce another reformulation of Vasyunin formula. This study is a complement of the recent work of M. Goubi concerning special case V (1/q).

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23

Wang, Zhi-Gang. "Analysis of the vertexes $ \Xi_{Q}^{*}$′QV , $ \Sigma_{Q}^{*}$ $ \Sigma_{Q}^{}$V and radiative decays $ \Xi_{Q}^{*}$ $ \rightarrow$ ′Q $ \gamma$ , $ \Sigma_{Q}^{*}$ $ \rightarrow$ $ \Sigma_{Q}^{}$ $ \gamma$." European Physical Journal A 44, no. 1 (March 12, 2010): 105–17. http://dx.doi.org/10.1140/epja/i2010-10952-8.

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24

Norberg, Ragnar. "Correction Note to Prediction of Outstanding Liabilities in Non-Life Insurance, AB 23, 95-115." ASTIN Bulletin 29, no. 1 (May 1999): 27. http://dx.doi.org/10.2143/ast.29.1.504604.

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1. In (4.17) a factor W is missing in the numerator of the expression in the middle.2. The predictor of Xorns proposed in Paragraph 5B is not unbiased in general as a simple counterexample will show. The proposed reserve on an individual orns claim with past history T, U, V > υ′ = τ – T – U, {Y′(υ″); 0 ≤ υ″ ≤ υ′}, isSuppose that Y = V and Y′(υ″) = Q(υ″/V)V, 0 ≤ υ″ ≤ V, where Q is a non-decreasing, deterministic function on [0,1] such that Q(0) = 0 and Q(1) = 1. In this case R = E[V∣T, U, V > Y′(υ′)] – Y′(υ′). If Q(s) > s for all s ∈ (0, 1), then Y′(υ′) = Q(υ′/V)V > υ′, hence

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25

Mendes-Gonçalves, Suzana, and R. P. Sullivan. "The Ideal Structure of Semigroups of Linear Transformations with Lower Bounds on Their Nullity or Defect." Algebra Colloquium 17, no. 01 (March 2010): 109–20. http://dx.doi.org/10.1142/s1005386710000131.

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Suppose V is an infinite-dimensional vector space and let T(V) denote the semigroup (under composition) of all linear transformations of V. In this paper, we study the semigroup OM(p,q) consisting of all α ∈ T(V) for which dim ker α ≥ q and the semigroup OE(p,q) of all α ∈ T(V) for which codim ran α ≥ q, where dim V = p ≥ q ≥ ℵ0. It is not difficult to see that OM(p,q) and OE(p,q) are a right ideal and a left ideal of T(V), respectively, and using these facts, we show that they belong to the class of all semigroups whose sets of bi-ideals and quasi-ideals coincide. Also, we describe Green's relations and the two-sided ideals of each semigroup, and determine its maximal regular subsemigroup. Finally, we determine some maximal right cancellative subsemigroups of OE(p,q).

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26

Harris, R. Scott, Donna-Beth Willey-Courand, C. Alvin Head, Gaetano G. Galletti, Daniel M. Call, and José G. Venegas. "Regional V˙a,Q˙, and V˙a/Q˙during PLV: effects of nitroprusside and inhaled nitric oxide." Journal of Applied Physiology 92, no. 1 (January 1, 2002): 297–312. http://dx.doi.org/10.1152/jappl.2002.92.1.297.

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Partial liquid ventilation (PLV) with high-specific-weight perfluorocarbon liquids has been shown to improve oxygenation in acute lung injury, possibly by redistributing perfusion from dependent, injured regions to nondependent, less injured regions of the lung. Our hypothesis was that during PLV in normal lungs, a shift in perfusion away from dependent lung zones might, in part, be due to vasoconstriction that could be reversed by infusing sodium nitroprusside (NTP). In addition, delivering inhaled NO during PLV should improve gas exchange by further redistributing blood flow to well-ventilated lung regions. To examine this, we used a single transverse-slice positron emission tomography camera to image regional ventilation and perfusion at the level of the heart apex in six supine mechanically ventilated sheep during five conditions: control, PLV, PLV + NTP, and PLV + NO at 10 and 80 ppm. We found that PLV shifted perfusion from dependent to middle regions, and the dependent region demonstrated marked hypoventilation. The vertical distribution of perfusion changed little when high-dose intravenous NTP was added during PLV, and inhaled NO tended to shift perfusion toward better ventilated middle regions. We conclude that PLV shifts perfusion to the middle regions of the lung because of the high specific weight of perflubron rather than vasoconstriction.

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27

Iohara, K., G. Lehrer, and R. Zhang. "Equivalence of a tangle category and a category of infinite dimensional 𝑈_{𝑞}(𝔰𝔩₂)-modules." Representation Theory of the American Mathematical Society 25, no. 10 (April 20, 2021): 265–99. http://dx.doi.org/10.1090/ert/568.

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It is very well known that if V V is the simple 2 2 -dimensional representation of U q ( s l 2 ) \mathrm {U}_q(\mathfrak {sl}_2) , the category of representations V ⊗ r V^{\otimes r} , r = 0 , 1 , 2 , … r=0,1,2,\dots , is equivalent to the Temperley-Lieb category T L ( q ) \mathrm {TL}(q) . Such categorical equivalences between tangle categories and categories of representations are rare. In this work we give a family of new equivalences by extending the above equivalence to one between the category of representations M ⊗ V ⊗ r M\otimes V^{\otimes r} , where M M is a projective Verma module of U q ( s l 2 ) \mathrm {U}_q(\mathfrak {sl}_2) and the type B B Temperley-Lieb category T L B ( q , Q ) \mathbb {TLB}(q,Q) , realised as a subquotient of the tangle category of Freyd, Yetter, Reshetikhin, Turaev and others.

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28

Bachmann, Kaspar F., Matthias Haenggi, Stephan M. Jakob, Jukka Takala, Luciano Gattinoni, and David Berger. "Gas exchange calculation may estimate changes in pulmonary blood flow during veno-arterial extracorporeal membrane oxygenation in a porcine model." American Journal of Physiology-Lung Cellular and Molecular Physiology 318, no. 6 (June 1, 2020): L1211—L1221. http://dx.doi.org/10.1152/ajplung.00167.2019.

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Veno-arterial extracorporeal membrane oxygenation (V-A ECMO) is used as rescue therapy for severe cardiopulmonary failure. We tested whether the ratio of CO2 elimination at the lung and the V-A ECMO (V˙co2ECMO/V˙co2Lung) would reflect the ratio of respective blood flows and could be used to estimate changes in pulmonary blood flow (Q˙Lung), i.e., native cardiac output. Four healthy pigs were centrally cannulated for V-A ECMO. We measured blood flows with an ultrasonic flow probe. V˙co2ECMO and V˙co2Lung were calculated from sidestream capnographs under constant pulmonary ventilation during V-A ECMO weaning with changing sweep gas and/or V-A ECMO blood flow. If ventilation-to-perfusion ratio (V˙/Q˙) of V-A ECMO was not 1, the V˙co2ECMO was normalized to V˙/Q˙ = 1 (V˙co2ECMONorm). Changes in pulmonary blood flow were calculated using the relationship between changes in CO2 elimination and V-A ECMO blood flow (Q˙ECMO). Q˙ECMO correlated strongly with V˙co2ECMONorm ( r2 0.95–0.99). Q˙Lung correlated well with V˙co2Lung ( r2 0.65–0.89, P < = 0.002). Absolute Q˙Lung could not be calculated in a nonsteady state. Calculated pulmonary blood flow changes had a bias of 76 (−266 to 418) mL/min and correlated with measured Q˙Lung ( r2 0.974–1.000, P = 0.1 to 0.006) for cumulative ECMO flow reductions. In conclusion, V˙co2 of the lung correlated strongly with pulmonary blood flow. Our model could predict pulmonary blood flow changes within clinically acceptable margins of error. The prediction is made possible with normalization to a V˙/Q˙ of 1 for ECMO. This approach depends on measurements readily available and may allow immediate assessment of the cardiac output response.

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29

Kreck, Thomas C., Melissa A. Krueger, William A. Altemeier, Scott E. Sinclair, H. Thomas Robertson, Erin D. Shade, Jacob Hildebrandt, et al. "Determination of regional ventilation and perfusion in the lung using xenon and computed tomography." Journal of Applied Physiology 91, no. 4 (October 1, 2001): 1741–49. http://dx.doi.org/10.1152/jappl.2001.91.4.1741.

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We propose a model to measure both regional ventilation (V˙) and perfusion (Q˙) in which the regional radiodensity (RD) in the lung during xenon (Xe) washin is a function of regional V˙ (increasing RD) and Q˙(decreasing RD). We studied five anesthetized, paralyzed, mechanically ventilated, supine sheep. Four 2.5-mm-thick computed tomography (CT) images were simultaneously acquired immediately cephalad to the diaphragm at end inspiration for each breath during 3 min of Xe breathing. Observed changes in RD during Xe washin were used to determine regional V˙ and Q˙. For 16 mm3, Q˙ displayed more variance than V˙: the coefficient of variance of Q˙ (CVQ˙) = 1.58 ± 0.23, the CV of V˙ (CVV˙) = 0.46 ± 0.07, and the ratio of CVQ˙ to CVV˙ = 3.5 ± 1.1. CVQ˙(1.21 ± 0.37) and the ratio of CVQ˙ to CVV˙ (2.4 ± 1.2) were smaller at 1,000-mm3 scale, but CVV˙ (0.53 ± 0.09) was not. V˙/Q˙ distributions also displayed scale dependence: log SD of V˙ and log SD of Q˙ were 0.79 ± 0.05 and 0.85 ± 0.10 for 16-mm3 and 0.69 ± 0.20 and 0.67 ± 0.10 for 1,000-mm3 regions of lung, respectively. V˙ and Q˙ measurements made with CT and Xe also demonstrate vertically oriented and isogravitational heterogeneity, which are described using other methodologies. Sequential images acquired by CT during Xe breathing can be used to determine both regional V˙ and Q˙ noninvasively with high spatial resolution.

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30

Nabozny, G. H., M. J. Bull, J. Hanson, M. M. Griffiths, H. S. Luthra, and C. S. David. "Collagen-induced arthritis in T cell receptor V beta congenic B10.Q mice." Journal of Experimental Medicine 180, no. 2 (August 1, 1994): 517–24. http://dx.doi.org/10.1084/jem.180.2.517.

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B10.Q (H-2q) mice congenic for the truncated T cell receptor (TCR) V beta a and V beta c haplotypes were derived to examine the influence of TCR V beta genomic deletions in murine collagen-induced arthritis (CIA). Previous studies using gene complementation and segregation analyses suggested that in SWR (H-2q) mice, possession of the V beta a gene deletion results in CIA resistance. However, other studies have suggested alternative hypotheses. Thus, analysis of TCR V beta congenic mice allows for direct examination of V beta genotypes in CIA control. After immunization with bovine type II collagen, B10.Q-V beta a mice showed no difference in arthritis susceptibility, onset, or severity when compared with prototype B10.Q mice. In contrast, B10.Q-V beta c mice, which lack the V beta 6, 15, 17, and 19 families in addition to the V beta a deletion, were highly resistant to CIA. In vivo depletion of V beta 6+ T cells in B10.Q-V beta a mice significantly delayed arthritis onset suggesting that, among those V beta genes present in V beta a but absent in V beta c, V beta 6+ T cells contribute to arthritogenesis. Our findings show that, in B10.Q-V beta congenic mice, while the V beta a genotype does not prevent CIA, the highly truncated V beta c genotype renders B10.Q mice resistant to CIA. Thus, deletions within the V beta TCR genome can indeed influence CIA and suggests that the TCR repertoire displays only marginal flexibility in response to arthritogenic stimuli.

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31

Shen, Ya-Ching, Kuang-Liang Lo, Yao-Haur Kuo, Yuh-Chi Kuo, Chung-Hsiung Chen, and Ashraf T. Khalil. "Cespihypotins Q−V, Verticillene Diterpenoids fromCespitularia hypotentaculata." Journal of Natural Products 71, no. 12 (December 26, 2008): 1993–97. http://dx.doi.org/10.1021/np8005327.

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32

Birchall, J. D., K. Blackband, M. Blaze, S. Lawes, and R. H. Ganatra. "50. Technician provisional V/Q scan reports." Nuclear Medicine Communications 24, no. 4 (April 2003): 460. http://dx.doi.org/10.1097/00006231-200304000-00069.

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33

Aoki, K., M. Kato, T. Satoh, M. Kanezashi, and Y. Nishimura. "Practical Method for Decentralized V-Q Control." IEEE Power Engineering Review PER-5, no. 2 (February 1985): 29–30. http://dx.doi.org/10.1109/mper.1985.5528861.

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34

Katz, Allen, Robert Gray, and Roger Dorval. "Linearizers for ${Q}$ - and ${V}$ -Band TWTAs." IEEE Transactions on Electron Devices 65, no. 6 (June 2018): 2371–77. http://dx.doi.org/10.1109/ted.2018.2806199.

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35

Wang, G. W., and Y. Chang. "Q and V band power InGaAs MESFETs." Electronics Letters 27, no. 6 (1991): 488. http://dx.doi.org/10.1049/el:19910307.

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36

Aoki, K., M. Kato, T. Satoh, M. Kanezashi, and Y. Nishimura. "Practical Method For Decentralized V-Q Control." IEEE Transactions on Power Apparatus and Systems PAS-104, no. 2 (February 1985): 257–65. http://dx.doi.org/10.1109/tpas.1985.319038.

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37

TIU, SERAFIN, PATRICK J. TOTH, HOWARD J. BANNER, ELISSA L. KRAMER, and JOSEPH J. SANGER. "Aortic Aneurysm Dissection Causing V/Q Mismatch." Clinical Nuclear Medicine 13, no. 3 (March 1988): 190–91. http://dx.doi.org/10.1097/00003072-198803000-00013.

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38

Ovadia, Marc, and Michael D. Tsifansky. "V/Q-SPECT Scintigraphy in Pulmonary Hypertension." JACC: Cardiovascular Imaging 11, no. 10 (October 2018): 1494–98. http://dx.doi.org/10.1016/j.jcmg.2017.08.028.

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Harris, Benjamin, Dale L. Bailey, Paul J. Roach, Geoffrey P. Schembri, Ivan HoShon, Peter Chicco, Elizabeth Bailey, and Gregory G. King. "A clinical comparison between traditional planar V/Q images and planar images generated from SPECT V/Q scintigraphy." Nuclear Medicine Communications 29, no. 4 (April 2008): 323–30. http://dx.doi.org/10.1097/mnm.0b013e3282f4a240.

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Nyrén, Sven, Peter Radell, Sten G. E. Lindahl, Margareta Mure, Johan Petersson, Stig A. Larsson, Hans Jacobsson, and Alejandro Sánchez-Crespo. "Lung Ventilation and Perfusion in Prone and Supine Postures with Reference to Anesthetized and Mechanically Ventilated Healthy Volunteers." Anesthesiology 112, no. 3 (March 1, 2010): 682–87. http://dx.doi.org/10.1097/aln.0b013e3181cf40c8.

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Background The literature on ventilation (V) and lung perfusion (Q) distributions during general anesthesia and controlled mechanical ventilation in supine and prone position is contradictory. The authors aimed to investigate whether V, Q, and ventilation to perfusion ratio (V/Q ratio) matching in anesthetized and mechanically ventilated volunteers are gravity dependent irrespective of posture. Methods Seven healthy volunteers were studied at two different occasions during general anesthesia and controlled mechanical ventilation. One occasion studied ventral to dorsal V and Q distributions in the supine posture and the other in the prone posture. Imaging was performed in supine posture at both occasions. A dual radiotracer technique and single photon emission computed tomography were used. V and Q were simultaneously tagged with Tc-Technegas (Tetley Manufacturing Ltd., Sydney, Australia) and In-labeled macroaggregates of human albumin (TechneScan LyoMAA, Mallinckrodt Medica, Petten, The Netherlands), respectively. Results No differences in V between postures were observed. Q differed between postures, being more uniform over different lung regions in prone posture and dependent in supine posture. The contribution of the vertical direction to the total V/Q ratio heterogeneity was larger in supine (31.4%) than in prone (16.4%) (P = 0.0639, two-tailed, paired t test) posture. Conclusions During mechanical ventilation, prone posture favors a more evenly distributed Q between lung regions. V distribution is independent of posture. This results in a tendency toward lower V/Q gradients in the ventral to dorsal direction in prone compared with supine posture.

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CHANG, SHU-CHIUAN, and ROBERT SHROCK. "PARTITION FUNCTION ZEROS OF A RESTRICTED POTTS MODEL ON SELF-DUAL STRIPS OF THE SQUARE LATTICE." International Journal of Modern Physics B 21, no. 10 (April 20, 2007): 1755–73. http://dx.doi.org/10.1142/s021797920703703x.

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We calculate the partition function Z(G, Q, v) of the Q-state Potts model exactly for self-dual cyclic square-lattice strips of various widths Ly and arbitrarily large lengths Lx, with Q and v restricted to satisfy the relation Q=v2. From these calculations, in the limit Lx→∞, we determine the continuous accumulation locus [Formula: see text] of the partition function zeros in the v and Q planes. A number of interesting features of this locus are discussed and a conjecture is given for properties applicable to arbitrarily large width. Relations with the loci [Formula: see text] for general Q and v are analyzed.

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Weinberg, Aaron S., William Chang, Grace Ih, Alan Waxman, and Victor F. Tapson. "Portable Ventilation/Perfusion Scanning is Useful for Evaluating Clinically Significant Pulmonary Embolism in the ICU Despite Abnormal Chest Radiography." Journal of Intensive Care Medicine 35, no. 10 (October 22, 2018): 1032–38. http://dx.doi.org/10.1177/0885066618807859.

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Objective: Computed tomography angiography is limited in the intensive care unit (ICU) due to renal insufficiency, hemodynamic instability, and difficulty transporting unstable patients. A portable ventilation/perfusion (V/Q) scan can be used. However, it is commonly believed that an abnormal chest radiograph can result in a nondiagnostic scan. In this retrospective study, we demonstrate that portable V/Q scans can be helpful in ruling in or out clinically significant pulmonary embolism (PE) despite an abnormal chest x-ray in the ICU. Design: Two physicians conducted chart reviews and original V/Q reports. A staff radiologist, with 40 years of experience, rated chest x-ray abnormalities using predetermined criteria. Setting: The study was conducted in the ICU. Patients: The first 100 consecutive patients with suspected PE who underwent a portable V/Q scan. Interventions: Those with a portable V/Q scan. Results: A normal baseline chest radiograph was found in only 6% of patients. Fifty-three percent had moderate, 24% had severe, and 10% had very-severe radiographic abnormalities. Despite the abnormal x-rays, 88% of the V/Q scans were low probability for a PE despite an average abnormal radiograph rating of moderate. A high-probability V/Q for PE was diagnosed in 3% of the population despite chest x-ray ratings of moderate to severe. Six patients had their empiric anticoagulation discontinued after obtaining the results of the V/Q scan, and no anticoagulation was started for PE after a low-probability V/Q scan. Conclusion: Despite the large percentage of moderate-to-severe x-ray abnormalities, PE can still be diagnosed (high-probability scan) in the ICU with a portable V/Q scan. Although low-probability scans do not rule out acute PE, it appeared less likely that any patient with a low-probability V/Q scan had severe hypoxemia or hemodynamic instability due to a significant PE, which was useful to clinicians and allowed them to either stop or not start anticoagulation.

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Peyton, Philip J., Gavin J. B. Robinson, and Bruce Thompson. "Ventilation-perfusion inhomogeneity increases gas uptake in anesthesia: computer modeling of gas exchange." Journal of Applied Physiology 91, no. 1 (July 1, 2001): 10–16. http://dx.doi.org/10.1152/jappl.2001.91.1.10.

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Ventilation-perfusion (V˙a/Q˙) inhomogeneity was modeled to measure its effect on overall gas exchange during maintenance-phase N2O anesthesia with an inspired O2 concentration of 30%. A multialveolar compartment computer model was used based on physiological log normal distributions of V˙a/Q˙ inhomogeneity. Increasing the log standard deviation of the distribution of perfusion from 0 to 1.75 paradoxically increased O2 uptake (V˙o 2) where a low mixed venous partial pressure of N2O [high N2O uptake (V˙n 2 o)] was specified. With rising mixed venous partial pressure of N2O, a threshold was observed where V˙o 2 began to fall, whereas V˙n 2 o began to rise with increasing V˙a/Q˙ inhomogeneity. This phenomenon is a magnification of the concentrating effects thatV˙o 2 andV˙n 2 o have on each other in low V˙a/Q˙ compartments. During “steady-state” N2O anesthesia,V˙n 2 o is predicted to paradoxically increase in the presence of worseningV˙a/Q˙ inhomogeneity.

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WAN, JINKUI, and WEIQIANG WANG. "Twisted Dickson–Mui invariants and the Steinberg module multiplicity." Mathematical Proceedings of the Cambridge Philosophical Society 151, no. 1 (March 18, 2011): 43–57. http://dx.doi.org/10.1017/s0305004111000120.

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AbstractWe determine the invariants, with arbitrary determinant twists, of the parabolic subgroups of the finite general linear group GLn(q) acting on the tensor product of the symmetric algebra S•(V) and the exterior algebra ∧•(V) of the natural GLn(q)-module V. In addition, we obtain the graded multiplicity of the Steinberg module of GLn(q) in S•(V) ⊗ ∧•(V), twisted by an arbitrary determinant power.

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GATA, MARIETA. "Comparing performance of a speaker recognition system for Dynamic Time Warping and Vector Quantization models." Creative Mathematics and Informatics 23, no. 2 (2014): 199–202. http://dx.doi.org/10.37193/cmi.2014.02.01.

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This paper analyzes Dynamic Time Warping (DTW) and Vector Quantization (V Q) technique for speaker recognition showing performance of each model. Text independent (T I) experiments are realized with V Q and text dependent (T D) experiments are realized with V Q and DTW.

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Chen, Chih-chi, Sinn-wen Chen, and Chih-horng Chang. "Solid/solid interfacial reactions between Sn–0.7 wt% Cu and Ni–7 wt% V." Journal of Materials Research 23, no. 7 (July 2008): 1895–901. http://dx.doi.org/10.1557/jmr.2008.0235.

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Sn–0.7 wt% Cu alloy is an important Pb-free solder, and Ni–7 wt% V is the major diffusion barrier layer material of flip chip technology. Reactions at the Sn–0.7 wt% Cu/Ni–7 wt% V interface are examined at 160, 180, and 210 °C. Only the Cu6Sn5 phase is formed in the Sn–0.7 wt% Cu/Ni–7 wt% V couple reacted at 160 and 180 °C; however, in addition to the Cu6Sn5 and Ni3Sn4 phases, a quaternary Q phase is formed in the Sn–0.7 wt% Cu/Ni–7 wt% V couple reacted at 210 °C. The Q phase is a mixture of nanocrystalline Ni3Sn4 phase and an amorphous phase. With longer reaction time at 210 °C in the Ni–V/Q/Sn–Cu couple where the Q phase is in direct contact with solder, the Ni3Sn4 phase nucleates inside the preformed Q phase, and the alternating layer phenomenon Ni–V/Q/Ni3Sn4/Q/Ni3Sn4/Cu6Sn5/Sn–Cu is observed. The interesting solid state amorphization and alternating layer phenomena at 210 °C are primarily caused by the fact that Sn and Cu are fast diffusing species, while V is relatively immobile.

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Jaworski, Jerzy. "Epidemic processes on digraphs of random mappings." Journal of Applied Probability 36, no. 3 (September 1999): 780–98. http://dx.doi.org/10.1239/jap/1032374634.

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A random mapping (Tn;q) of a finite set V, V = {1,2,…,n}, into itself assigns independently to each i ∊ V its unique image j ∊ V with probability q if i = j and with probability P = (1-q)/(n−1) if i ≠ j. Three versions of epidemic processes on a random digraph GT representing (Tn;q) are studied. The exact probability distributions of the total number of infected elements as well as the threshold functions for these epidemic processes are determined.

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Gonçalves, Deise Josely Pereira, Rosana Romero, and Kikyo Yamamoto. "Vochysiaceae no Parque Nacional da Serra da Canastra, Minas Gerais, Brasil." Rodriguésia 64, no. 4 (December 2013): 863–75. http://dx.doi.org/10.1590/s2175-78602013000400014.

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No Parque Nacional da Serra da Canastra, localizado a sudoeste do estado de Minas Gerais, foram encontradas 11 espécies de quatro gêneros da família Vochysiaceae: Vochysia, com cinco espécies (V. cinnamomea Pohl, V. elliptica Mart., V. sessilifolia Warm., V. thyrsoidea Pohl e V. tucanorum Mart.), Qualea com quatro espécies (Q. cordata Spreng., Q. grandiflora Mart., Q. multiflora Mart. e Q. parviflora Mart.) e Callisthene e Salvertia com uma espécie cada, C. major Mart. e S. convallariodora A.St.-Hil. O presente artigo fornece chave de identificação e descrições das espécies, dados de distribuição geográfica, comentários taxonômicos e ilustrações dos caracteres diagnósticos.

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Edlinger-Stanger, Maximilian, Martin-Hermann Bernardi, Katharina Kovacs, Michael Mascha, Thomas Neugebauer, Stefan Böhme, Nathan Ayoubi, et al. "The effect of acute ventilation-perfusion mismatch on respiratory heat exchange in a porcine model." PLOS ONE 16, no. 7 (July 12, 2021): e0254399. http://dx.doi.org/10.1371/journal.pone.0254399.

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Background Respiratory heat exchange is an important physiological process occurring in the upper and lower respiratory tract and is usually completed when inspired gases reach the alveoli. Animal and human studies demonstrated that heat exchange can be modulated by altering pulmonary ventilation and perfusion. The purpose of this study was to examine the effect of acute ventilation-perfusion (V/Q) mismatch on respiratory heat exchange. In clinical practice, monitoring respiratory heat exchange might offer the possibility of real-time tracking of acute V/Q-mismatch. Methods In 11 anesthetized, mechanically ventilated pigs, V/Q-mismatch was established by means of four interventions: single lung ventilation, high cardiac output, occlusion of the left pulmonary artery and repeated whole-lung lavage. V/Q-distributions were determined by the multiple inert gas elimination technique (MIGET). Respiratory heat exchange was measured as respiratory enthalpy using the novel, pre-commercial VQm™ monitor (development stage, Rostrum Medical Innovations, Vancouver, CA). According to MIGET, shunt perfusion of low V/Q compartments increased during single lung ventilation, high cardiac output and whole-lung lavage, whereas dead space and ventilation of high V/Q compartments increased during occlusion of the left pulmonary artery and whole-lung lavage. Results Bohr dead space increased after pulmonary artery occlusion and whole-lung lavage, venous admixture increased during single lung ventilation and whole-lung lavage, PaO2/FiO2 was decreased during all interventions. MIGET confirmed acute V/Q-mismatch. Respiratory enthalpy did not change significantly despite significant acute V/Q-mismatch. Conclusion Clinically relevant V/Q-mismatch does not impair respiratory heat exchange in the absence of additional thermal stressors and may not have clinical utility in the detection of acute changes.

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Jaworski, Jerzy. "Epidemic processes on digraphs of random mappings." Journal of Applied Probability 36, no. 03 (September 1999): 780–98. http://dx.doi.org/10.1017/s0021900200017575.

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A random mapping (T n ;q) of a finite set V, V = {1,2,…,n}, into itself assigns independently to each i ∊ V its unique image j ∊ V with probability q if i = j and with probability P = (1-q)/(n−1) if i ≠ j. Three versions of epidemic processes on a random digraph G T representing (T n ;q) are studied. The exact probability distributions of the total number of infected elements as well as the threshold functions for these epidemic processes are determined.

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