Journal articles: '(QMAG)'

1

Beigi, S. "NP vs QMA_\log(2)." Quantum Information and Computation 10, no. 1&2 (January 2010): 141–51. http://dx.doi.org/10.26421/qic10.1-2-10.

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Although it is believed unlikely that $\NP$-hard problems admit efficient quantum algorithms, it has been shown that a quantum verifier can solve NP-complete problems given a "short" quantum proof; more precisely, NP\subseteq QMA_{\log}(2) where QMA_{\log}(2) denotes the class of quantum Merlin-Arthur games in which there are two unentangled provers who send two logarithmic size quantum witnesses to the verifier. The inclusion NP\subseteq QMA_{\log}(2) has been proved by Blier and Tapp by stating a quantum Merlin-Arthur protocol for 3-coloring with perfect completeness and gap 1/24n^6. Moreover, Aaronson et al. have shown the above inclusion with a constant gap by considering $\widetilde{O}(\sqrt{n})$ witnesses of logarithmic size. However, we still do not know if QMA_{\log}(2) with a constant gap contains NP. In this paper, we show that 3-SAT admits a QMA_{\log}(2) protocol with the gap 1/n^{3+\epsilon}} for every constant \epsilon>0.

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Feng, Q., and W. H. Woodin. "P-points in Qmax models." Annals of Pure and Applied Logic 119, no. 1-3 (February 2003): 121–90. http://dx.doi.org/10.1016/s0168-0072(02)00036-2.

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Bookatz, Adam D. "QMA-complete problems." Quantum Information and Computation 14, no. 5&6 (May 2014): 361–83. http://dx.doi.org/10.26421/qic14.5-6-1.

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In this paper we give an overview of the quantum computational complexity class QMA and a description of known QMA-complete problems to date (The reader is invited to share more proven QMA-complete problems with the author). Such problems are believed to be difficult to solve, even with a quantum computer, but have the property that if a purported solution to the problem is given, a quantum computer would easily be able to verify whether it is correct. An attempt has been made to make this paper as self-contained as possible so that it can be accessible to computer scientists, physicists, mathematicians, and quantum chemists. Problems of interest to all of these professions can be found here.

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de Oliveira-Costa, Angelica, Max Tegmark, Mark J. Devlin, L. M. Haffner, Tom Herbig, Amber D. Miller, Lyman A. Page, Ron J. Reynolds, and S. L. Tufte. "Galactic Contamination in the QMAP Experiment." Astrophysical Journal 542, no. 1 (October 10, 2000): L5—L8. http://dx.doi.org/10.1086/312909.

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5

Nagaj, D., P. Wocjan, and Y. Zhang. "Fast amplification of QMA." Quantum Information and Computation 9, no. 11&12 (November 2009): 1053–68. http://dx.doi.org/10.26421/qic9.11-12-8.

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Given a verifier circuit for a problem in QMA, we show how to exponentially amplify the gap between its acceptance probabilities in the `yes' and `no' cases, with a method that is quadratically faster than the procedure given by Marriott and Watrous. Our construction is natively quantum, based on the analogy of a product of two reflections and a quantum walk. Second, in some special cases we show how to amplify the acceptance probability for good witnesses to 1, making a step towards the proof that QMA with one-sided error QMA_1 is equal to QMA. Finally, we simplify the filter-state method to search for QMA witnesses by Poulin and Wocjan.

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Aaronson, S. "On perfect completeness for QMA." Quantum Information and Computation 9, no. 1&2 (January 2009): 81–89. http://dx.doi.org/10.26421/qic9.1-2-5.

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Whether the class QMA (Quantum Merlin Arthur)\ is equal to QMA_1, or QMA with one-sided error, has been an open problem for years. This note helps to explain why the problem is difficult,\ by using ideas from real analysis to give a "quantum" relative to which QMA \neq QMA_1. As a byproduct, we find that there are facts about quantum complexity classes that are classically relativizing but not quantumly relativizing, among them such "trivial" containments as BQP \subseteq ZQEXP.

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Dziemba, Friederike Anna. "Robustness of QMA against witness noise." Quantum Information and Computation 17, no. 13&14 (November 2017): 1167–90. http://dx.doi.org/10.26421/qic17.13-14-6.

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Using the tool of concatenated stabilizer coding, we prove that the complexity class QMA remains unchanged even if every witness qubit is disturbed by constant noise. This result may not only be relevant for physical implementations of verifying protocols but also attacking the relationship between the complexity classes QMA, QCMA and BQP, which can be reformulated in this unified framework of a verifying protocol receiving a disturbed witness. While QCMA and BQP are described by fully dephasing and depolarizing channels on the witness qubits, respectively, our result proves QMA to be robust against 27% dephasing and 18% depolarizing noise.

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Kempe, J., and O. Regev. "3-Local Hamiltonian is QMA-complete." Quantum Information and Computation 3, no. 3 (May 2003): 258–64. http://dx.doi.org/10.26421/qic3.3-7.

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Gharibian, Sevag, Jamie Sikora, and Sarvagya Upadhyay. "QMA variants with polynomially many provers." Quantum Information and Computation 13, no. 1&2 (January 2013): 135–57. http://dx.doi.org/10.26421/qic13.1-2-8.

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We study three variants of multi-prover quantum Merlin-Arthur proof systems. We first show that the class of problems that can be efficiently verified using polynomially many quantum proofs, each of logarithmic-size, is exactly \class{MQA} (also known as QCMA), the class of problems which can be efficiently verified via a classical proof and a quantum verifier. We then study the class $\class{BellQMA}(\poly)$, characterized by a verifier who first applies unentangled, nonadaptive measurements to each of the polynomially many proofs, followed by an arbitrary but efficient quantum verification circuit on the resulting measurement outcomes. We show that if the number of outcomes per nonadaptive measurement is a polynomially-bounded function, then the expressive power of the proof system is exactly \class{QMA}. Finally, we study a class equivalent to \class{QMA}($m$), denoted $\class{SepQMA}(m)$, where the verifier's measurement operator corresponding to outcome {\it accept} is a fully separable operator across the $m$ quantum proofs. Using cone programming duality, we give an alternate proof of a result of Harrow and Montanaro [FOCS, pp. 633--642 (2010)] that shows a perfect parallel repetition theorem for $\class{SepQMA}(m)$ for any $m$.

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10

Gharibian, Sevag, and Julia Kempe. "Approximation Algorithms for QMA-Complete Problems." SIAM Journal on Computing 41, no. 4 (January 2012): 1028–50. http://dx.doi.org/10.1137/110842272.

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11

JANZING, DOMINIK, PAWEL WOCJAN, and THOMAS BETH. ""NON-IDENTITY-CHECK" IS QMA-COMPLETE." International Journal of Quantum Information 03, no. 03 (September 2005): 463–73. http://dx.doi.org/10.1142/s0219749905001067.

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We describe a computational problem that is complete for the complexity class QMA, a quantum generalization of NP. It arises as a natural question in quantum computing and quantum physics. "Non-identity-check" is the following decision problem: Given a classical description of a quantum circuit (a sequence of elementary gates), determine whether it is almost equivalent to the identity. Explicitly, the task is to decide whether the corresponding unitary is close to a complex multiple of the identity matrix with respect to the operator norm. We show that this problem is QMA-complete. A generalization of this problem is "non-equivalence check": given two descriptions of quantum circuits and a description of a common invariant subspace, decide whether the restrictions of the circuits to this subspace almost coincide. We show that non-equivalence check is also in QMA and hence QMA-complete.

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12

Broadbent, Anne, Zhengfeng Ji, Fang Song, and John Watrous. "Zero-Knowledge Proof Systems for QMA." SIAM Journal on Computing 49, no. 2 (January 2020): 245–83. http://dx.doi.org/10.1137/18m1193530.

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13

Deva, Sanjeev, Jacek Mackiewicz, Stephane Dalle, Helen Gogas, Iwona Lugowska, Alfonso Berrocal, Alexander M. Menzies, et al. "Abstract CT557: Phase 1/2 study of quavonlimab (Qmab) + pembrolizumab (pembro) in patients (pts) with advanced melanoma that progressed on a PD-1/PD-L1 inhibitor." Cancer Research 82, no. 12_Supplement (June 15, 2022): CT557. http://dx.doi.org/10.1158/1538-7445.am2022-ct557.

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Abstract Background: Safe, effective treatment options for advanced melanoma that progressed on a PD-1/PD-L1 inhibitor is an unmet medical need. Results of the phase 1b KEYNOTE-029 trial showed promising antitumor activity in advanced melanoma with pembro combined with a CTLA-4 inhibitor. This ongoing, open-label, multiarm phase 1/2 study (NCT03179436) evaluating the CTLA-4 inhibitor Qmab + pembro showed antitumor activity as first-line treatment for advanced NSCLC and for previously treated extensive-stage SCLC. Data from the efficacy expansion phase in pts with advanced melanoma that progressed on a PD-1/PD-L1 inhibitor are presented. Methods: Pts with unresectable stage III-IV melanoma and confirmed progressive disease (PD) per iRECIST within 12 wk of the last dose of a PD-1/PD-L1 inhibitor given alone or in combination for ≥2 doses (combinations with CTLA-4 inhibitors were not allowed) were randomly assigned (1:1) to receive Qmab 25 mg IV Q6W with or without pembro 400 mg IV Q6W; 100 pts in the Qmab + pembro arm and 40 pts in the Qmab monotherapy arm were planned for enrollment. Treatment in both arms was given for up to 18 cycles (~2 y) or until PD, toxicity, or pt withdrawal. Pts who had PD after ≥2 Qmab monotherapy cycles could crossover to Qmab + pembro. Tumor imaging was assessed Q9W to wk 54 and Q12W thereafter. Primary end points were safety and ORR by BICR per RECIST v1.1. Secondary and exploratory end points included DOR and PFS by BICR per RECIST v1.1 and OS. Results: 151 pts were enrolled (n = 111, Qmab + pembro; n = 40, Qmab monotherapy); median time from first dose to database cutoff was 7.7 mo. In all pts, median age was 64 y; 66% of pts were male, 33% had BRAF-mutant tumors, and 50% had elevated LDH. Treatment-related adverse events (TRAEs) were reported in 87 pts (78%) in the Qmab + pembro arm and 24 pts (60%) in the Qmab monotherapy arm; grade 3/4 TRAEs were reported in 16 pts (14%) and 3 pts (8%), respectively. The most common TRAEs were pruritus (26%), fatigue (14%), diarrhea (14%), and rash (13%). No treatment-related deaths occurred in either arm; 5% of pts discontinued because of TRAEs. Confirmed ORR was 9% (95% CI, 4.4-15.9) with Qmab + pembro (1 CR, 9 PRs) and 3% (95% CI, 0.1-13.2) with Qmab monotherapy (1 PR). Median DOR was not reached (NR; range, 2.0+ to 13.8+ mo) with Qmab + pembro. DOR was 1.9+ with Qmab monotherapy. Median PFS was 2.1 mo (95% CI, 2.1-3.2) with Qmab + pembro and 2.1 mo (95% CI, 2.1-2.5) with Qmab monotherapy; 6-mo PFS rates were 21% and 13%, respectively. Median OS was NR (95% CI, 11.2 mo to NR) with Qmab + pembro and 7.8 mo (95% CI, 6.3 to NR) with Qmab monotherapy; 6-mo OS rates were 74% and 73%, respectively. Conclusions: Qmab + pembro was generally well tolerated and provided modest antitumor activity in pts with advanced melanoma that progressed on a PD-1/PD-L1 inhibitor. This combination and a coformulation of Qmab + pembro will be further investigated in the KEYMAKER-U02 study. Citation Format: Sanjeev Deva, Jacek Mackiewicz, Stephane Dalle, Helen Gogas, Iwona Lugowska, Alfonso Berrocal, Alexander M. Menzies, Michele Maio, Adnan Nagrial, Karmele Mujika Eizmendi, Jean-Jacques Grob, Christian Caglevic, Megan Lyle, Juan Martin-Liberal, Rachel Altura, Yixin Ren, Anuradha Khilnani, Jobin Cyrus, Shabana Siddiqi, Michal Lotem. Phase 1/2 study of quavonlimab (Qmab) + pembrolizumab (pembro) in patients (pts) with advanced melanoma that progressed on a PD-1/PD-L1 inhibitor [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2022; 2022 Apr 8-13. Philadelphia (PA): AACR; Cancer Res 2022;82(12_Suppl):Abstract nr CT557.

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14

Di, Ruohai, Ye Li, Kaifang Wan, Zhigang Lyu, and Peng Wang. "Bayesian network parameter learning algorithm based on improved QMAP." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 39, no. 6 (December 2021): 1356–67. http://dx.doi.org/10.1051/jnwpu/20213961356.

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Small data sets make the statistical information in Bayesian network parameter learning inaccurate, which makes it difficult to get accurate Bayesian network parameters based on data. Qualitative maximum a posteriori estimation (QMAP) is the most accurate algorithm for Bayesian network parameter learning under the condition of small data sets. However, when the number of parameter constraints is large or the parameter feasible region is small, the rejection-acceptance sampling process in QMAP algorithm will become extremely time-consuming. In order to improve the learning efficiency of QMAP algorithm and not affect its learning accuracy as much as possible, a new analytical calculation method of the center point of constrained region is designed to replace the original rejection-acceptance sampling calculation method. Firstly, a new objective function is designed, and a constrained objective optimization problem for solving the boundary points of the constrained region is constructed. Secondly, a new optimization engine is used to solve the objective optimization problem, and the boundary points and center points of the constrained region are obtained. Finally, the existing QMAP algorithm is improved by the obtained center points. The simulation results show that the CMAP algorithm proposed in this paper has a slightly worse parameter learning accuracy than the QMAP algorithm, but its computational efficiency is 2-5 times higher than that of the QMAP algorithm.

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Brenner, Julia, Wesley Porter, Jana R. Phillips, Joanne Childs, Xiaojuan Yang, and Melanie A. Mayes. "Phosphorus sorption on tropical soils with relevance to Earth system model needs." Soil Research 57, no. 1 (2019): 17. http://dx.doi.org/10.1071/sr18197.

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Phosphorus (P) availability critically limits the productivity of tropical forests growing on highly weathered, low-P soils. Although efforts to incorporate P into Earth system models (ESMs) provide an opportunity to better estimate tropical forest response to climate change, P sorption dynamics and controls on soil P availability are not well constrained. Here, we measured P and dissolved organic carbon (DOC) sorption isotherms on 23 soils from tropical Oxisol, Ultisol, Inceptisol, Andisol, and Aridisol soils using P concentrations from 10 to 500mg P L−1, and DOC concentrations from 10 to 100mg DOC L−1. Isotherms were fit to the Langmuir equation and parameters were related to soil characteristics. Maximum P sorption capacity (Qmax) was significantly correlated with clay content (ρ=0.658) and aluminium (Al)- or iron (Fe)-oxide concentrations (ρ=0.470 and 0.461 respectively), and the DOC Qmax was correlated with Fe oxides (ρ=0.491). Readily available soil characteristics could eventually be used to estimate Qmax values. Analysis of literature values demonstrated that the maximum initial P concentration added to soils had a significant impact on the resultant Qmax, suggesting that an insufficiently low initial P range could underestimate Qmax. This study improves methods for measuring P Qmax and estimating Qmax in the absence of isotherm analyses and provides key data for use in ESMs.

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Lee, Yong-Gu, Jaegwan Shin, Jinwoo Kwak, Sangwon Kim, Changgil Son, Geon-Youb Kim, Chang-Ha Lee, and Kangmin Chon. "Enhanced Adsorption Capacities of Fungicides Using Peanut Shell Biochar via Successive Chemical Modification with KMnO4 and KOH." Separations 8, no. 4 (April 15, 2021): 52. http://dx.doi.org/10.3390/separations8040052.

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This study explored the effects of peanut shell biochar (PSB) on the adsorption capacities of fungicides with and without successive chemical modifications, using KMnO4 and KOH (PSBOX-A), in order to provide a valuable understanding of their adsorption mechanisms and behaviors. To this end, the physicochemical properties of PSB and PSBOX-A were examined by using the Brunauer–Emmett–Teller method, Fourier transform infrared spectroscopy, and scanning electron microscopy with an energy dispersive X-ray spectrometer. The effects of temperature, ionic strength, and humic acids on the adsorption of fungicides, using PSB and PSBOX-A, were estimated through batch experiments. Furthermore, adsorption kinetics, isotherms, and thermodynamics were studied. The maximum adsorption capacities of fungicides by PSBOX-A were estimated to be more notable (Qmax of carbendazim = 531.2 μmol g−1, Qmax of pyrimethanil = 467.7 μmol g−1, and Qmax of tebuconazole = 495.1 μmol g−1) than PSB (Qmax of carbendazim = 92.6 μmol g−1, Qmax of pyrimethanil = 61.7 μmol g−1, and Qmax of tebuconazole = 66.7 μmol g−1). These findings suggest that successive chemical modification using KMnO4 and KOH could potentially be used to effectively fabricate PSB to remove fungicides in water-treatment processes.

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Gosset, David, and Daniel Nagaj. "Quantum 3-SAT Is QMA$_1$-Complete." SIAM Journal on Computing 45, no. 3 (January 2016): 1080–128. http://dx.doi.org/10.1137/140957056.

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Bryanskaya, Yuliya, and Aleksandra Ostyakova. "Results of hydraulic tests of the ACO Qmax system pipeline." E3S Web of Conferences 264 (2021): 03073. http://dx.doi.org/10.1051/e3sconf/202126403073.

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Polymer corrugated pipelines are a very promising type of construction that has many advantages over concrete and reinforced concrete structures that are widely used today for collecting and diverting surface runoff from residential areas and enterprise sites. To collect and divert surface runoff from residential areas and enterprise sites, the hydraulic characteristics of the drainage system made of corrugated polymer culverts of ACO Qmax are studied by computational and experimental methods. The experiments were carried out in the laboratory of Hydraulics and hydro-mechanics at different flow rates and different slopes. The kinematic and dynamic characteristics of the water flow in the pipeline were determined: the velocity, the roughness coefficient, and the hydraulic resistance coefficient were measured at different values of the pipeline filling. It is found that the characteristics of the water flow obtained by the computational method using a computer program differ from the experimental values, the reason for which, apparently, in the shortcomings of the computational program and the lack of accuracy of experimental measurements. Experimental studies were conducted to adjust the calculation methods of such pipelines used in the design and verification of hydraulic calculation methods of corrugated pipelines based on the software product ACO Qmax.

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de Oliveira-Costa, Angelica, Mark J. Devlin, Tom Herbig, Amber D. Miller, C. Barth Netterfield, Lyman A. Page, and Max Tegmark. "Mapping the Cosmic Microwave Background Anisotropy:Combined Analysis of QMAP Flights." Astrophysical Journal 509, no. 2 (December 20, 1998): L77—L80. http://dx.doi.org/10.1086/311767.

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Bhardwaj, Megha, Tobias Terzer, Petra Schrotz-King, and Hermann Brenner. "Comparison of Proteomic Technologies for Blood-Based Detection of Colorectal Cancer." International Journal of Molecular Sciences 22, no. 3 (January 26, 2021): 1189. http://dx.doi.org/10.3390/ijms22031189.

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Blood-based protein biomarkers are increasingly being explored as supplementary or efficient alternatives for population-based screening of colorectal cancer (CRC). The objective of the current study was to compare the diagnostic potential of proteins measured with different proteomic technologies. The concentrations of protein biomarkers were measured using proximity extension assays (PEAs), liquid chromatography/multiple reaction monitoring–mass spectrometry (LC/MRM-MS) and quantibody microarrays (QMAs) in plasma samples of 56 CRC patients and 99 participants free of neoplasms. In another approach, proteins were measured in serum samples of 30 CRC cases and 30 participants free of neoplasm using immunome full-length functional protein arrays (IpAs). From all the measurements, 9, 6, 35 and 14 protein biomarkers overlapped for comparative evaluation of (a) PEA and LC/MRM-MS, (b) PEA and QMA, (c) PEA and IpA, and (d) LC/MRM-MS and IpA measurements, respectively. Correlation analysis was performed, along with calculation of the area under the curve (AUC) for assessing the diagnostic potential of each biomarker. DeLong’s test was performed to assess the differences in AUC. Evaluation of the nine biomarkers measured with PEA and LC/MRM-MS displayed correlation coefficients >+0.6, similar AUCs and DeLong’s p-values indicating no differences in AUCs for biomarkers like insulin-like growth factor binding protein 2 (IGFBP2), matrix metalloproteinase 9 (MMP9) and serum paraoxonase lactonase 3 (PON3). Comparing six proteins measured with PEA and QMA showed good correlation and similar diagnostic performance for only one protein, growth differentiation factor 15 (GDF15). The comparison of 35 proteins measured with IpA and PEA and 14 proteins analyzed with IpA and LC/MRM-MS revealed poor concordance and comparatively better AUCs when measured with PEA and LC/MRM-MS. The comparison of different proteomic technologies suggests the superior performance of novel technologies like PEA and LC/MRM-MS over the assessed array-based technologies in blood-protein-based early detection of CRC.

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Chang, Kuo-Chu, Huey-Ming Lo, and Yung-Zu Tseng. "Systolic Elastance and Resistance in the Regulation of Cardiac Pumping Function in Early Streptozotocin-Diabetic Rats." Experimental Biology and Medicine 227, no. 4 (April 2002): 251–59. http://dx.doi.org/10.1177/153537020222700405.

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We determined the roles of maximal systolic elastance (Emax) and theoretical maximum flow (Qmax) in the regulation of cardiac pumping function in early streptozotocin (STZ)-diabetic fats. Physically, Emax can reflect the intrinsic contractility of the myocardium as an intact heart, and Qmax has an inverse relation to the systolic resistance of the left ventricle. Rats given STZ 65 mg/kg l.v. (n = 17) were divided into two groups, 1 week and 4 weeks after induction of diabetes, and compared with untreated age-matched controls (n = 15). Left ventricular (LV) pressure and ascending aortic flow signals were recorded to calculate Emax and Qmax, using the elastance-resistance model. After 1 or 4 weeks, STZ-diabetic animals show an increase in effective LV end-diastolic volume (Veed), no significant change in peak iso-volumic pressure (Pisomax), and a decline in effective arterial volume elastance (Ea). The maximal systolic elastance Emax is reduced from 751.5 ± 23.1 mmHg/ml in controls to 514.1 ± 22.4 mmHg/ml in 1- and 538.4 ± 33.8 mmHg/ml in 4-week diabetic rats. Since Emax equals PisomaxVeed, an increase in Veed with unaltered Pisomax may primarily act to diminish Emax so that the intrinsic contractility of the diabetic heart is impaired. By contrast, STZ-diabetic rats have higher theoretical maximum flow Qmax (40.9 ± 2.8 ml/s in 1- and 44.5 ± 3.8 ml/s in 4-week diabetic rats) than do controls (30.7 ± 1.7 ml/s). There exists an inverse relation between Qmax and Ea when a linear regression of Qmax on Ea is performed over all animals studied (r= 0.65, p < 0.01). The enhanced Qmax is indicative of the decline in systolic resistance of the diabetic rat heart. The opposing effects of enhanced Qmax and reduced Emax may negate each other, and then the cardiac pumping function of the early STZ-diabetic rat heart could be preserved before cardiac failure occurs.

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Richard, Patrick, Nydia Icaza Ordonez, and Le Mai Tu. "The effect of a 6 Fr catheter in women: Are they obstructive?" Canadian Urological Association Journal 7, no. 5-6 (June 12, 2013): 185. http://dx.doi.org/10.5489/cuaj.1320.

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Objectives: Our objective was to evaluate the effect of a 6 Fr transurethral catheter on the uroflowmetry and to assess whether it potentially contributes to the bladder outlet obstruction (BOO) in women.Methods: We reviewed the charts of 1367 women who underwent an urodynamic study. We included patients with a non-invasive free-flow study (NIFFS) and pressure flow study (PFS) performed through a 6 Fr double lumen transurethral catheter.Results: In total, 120 women met the inclusion/exclusion criteria. Mean maximal flow rate (Qmax) was significantly higher (p < 0.001) in the NIFFS (27.2±11.1 mL/s) than in the PFS (19.3±10.6 mL/s). The mean difference between both Qmax was 7.9±12.0 mL/s. Of these women, 92.3% (24/26) with a Qmax <12 mL/s during PFS were found to have a Qmax ≥12 mL/s during the NIFFS. Ten of the 72 women with an available Pdet.Qmax were deemed to have a BOO according to the PFS and all of them had a Qmax >12 mL/s during the NIFFS. Of the 10 patients, only 2 reported obstructive symptoms.Conclusion: The presence of 6 Fr transurethral catheters alters the PFS and results in a significant reduction of the Qmax in patients who voided more than 250 mL. We believe that NIFFS should be performed in all patients before any urethral manipulation to lower a possible overdiagnosis of BOO and findings should always be correlated to clinical symptoms.

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Zhang, Lianyang. "Prediction of end-bearing capacity of rock-socketed shafts considering rock quality designation (RQD)." Canadian Geotechnical Journal 47, no. 10 (October 2010): 1071–84. http://dx.doi.org/10.1139/t10-016.

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Existing empirical methods for determining the end-bearing capacity, qmax, use empirical relations between qmax and the unconfined compressive strength of intact rock, σc. As rock-socketed shafts are supported by the rock mass, not just the intact rock, one should consider not only the intact rock properties, but also the influence of discontinuities on rock mass properties when determining qmax. Although semi-empirical and analytical methods have been developed that can consider the effect of discontinuities, they are more complicated than the empirical relations and require information about discontinuities that is often not available or difficult to obtain in engineering practice. In this paper, an empirical relation between qmax and the unconfined compressive strength of rock mass, σcm, is developed. The new empirical relation explicitly considers the effect of discontinuities represented by rock quality designation (RQD), which is the parameter normally obtained in engineering practice. The accuracy of the expression for estimating σcm based on RQD is verified by comparing its estimation values with those from the existing empirical expressions based on rock mass classification. Two examples are presented to show the application of the newly developed empirical relation between qmax and σcm.

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BARCLAY, J. K. "Physiological determinants of Qmax in contracting canine skeletal muscle in situ." Medicine & Science in Sports & Exercise 20, Sup 1 (October 1988): S113—S118. http://dx.doi.org/10.1249/00005768-198810001-00004.

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Rattenbury, MS, and MJ Isaac. "The QMAP 1:250 000 Geological Map of New Zealand project." New Zealand Journal of Geology and Geophysics 55, no. 4 (December 2012): 393–405. http://dx.doi.org/10.1080/00288306.2012.725417.

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Raza, Iffat, Nausheen Jamshed, Mubina Lakhani, Maria Mohiuddin, Syeda Bushra Ahmed, and Sahrish Mukhtar. "Correlation of Uroflowmetry with Prostate Volume and International Prostatic Symptom Score (IPSS)." Journal of Bahria University Medical and Dental College 12, no. 04 (October 1, 2022): 191–96. http://dx.doi.org/10.51985/jbumdc202242.

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Objective: To correlate Uroflowmetry with Prostate volume and International Prostatic Symptom Score in BPH patients and healthy adults in a subset of Karachi Population. Study Design and Setting: This is a crossectional study carried out at Ziauddin Hospital, Karachi over a period of 6 months. Methodology: In this study 100 Samples were taken through non probability convenience sampling. Inclusion criteria includes 40years and above. Sample initially was taken on the basis of International Prostatic Symptom Score i.e., less than 8 and greater than 8 score. Ultrasonography was performed. 65 Individuals with International Prostatic Symptom Score > 8 and Prostate volume <25 and individuals having symptom index < 8 and Prostate volume > 25ml went for Uroflowmetry. Mean and standard deviation was taken out for quantitative variables. Univariate analysis and Multiple Linear Regression applied to assess relationship between Uroflowmetry with Prostate volume and International Prostatic Symptom Score. Result: Mean age of patients was found to be 58±6 years. Mean International Prostatic Symptom Score was 11±4. Mean Prostate Volume was 28ml±5, mean Qmax was 14ml/s ±4. The correlation between Qmax and International Prostatic symptom score was found to be negative (-0.78) and statistically significant. No correlation was found between Prostate volume and Qmax. Conclusion: Qmax and International Prostatic Symptom Score are reliable tool for assessing Benign Prostatic Hyperplasia patients concluding that as Symptom Score increases Qmax decreases. Qmax showed no correlation with Prostate volume. Prostate volume assessed on Ultrasonography is not an authentic parameter for diagnosing BPH patients

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Le Gall, Francois, Shota Nakagawa, and Harumichi Nishimura. "On QMA protocols with two short quantum proofs." Quantum Information and Computation 12, no. 7&8 (July 2012): 589–600. http://dx.doi.org/10.26421/qic12.7-8-4.

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This paper gives a QMA (Quantum Merlin-Arthur) protocol for 3-SAT with two logarithmic-size quantum proofs (that are not entangled with each other) such that the gap between the completeness and the soundness is $\Omega(\frac{1}{n\polylog{n}})$. This improves the best completeness/soundness gaps known for NP-complete problems in this setting.

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Hui, C. S., and W. K. Chandler. "Intramembranous charge movement in frog cut twitch fibers mounted in a double vaseline-gap chamber." Journal of General Physiology 96, no. 2 (August 1, 1990): 257–97. http://dx.doi.org/10.1085/jgp.96.2.257.

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Intramembranous charge movement was measured in cut twitch fibers mounted in a double Vaseline-gap chamber with either a tetraethylammonium chloride (TEA.Cl) or a TEA2.SO4 solution (13-14 degrees C) in the central pool. Charge vs. voltage data were fitted by a single two-state Boltzmann distribution function. The average values of V (the voltage at which steady-state charge is equally distributed between the two Boltzmann states), k (the voltage dependence factor), and qmax/cm (the maximum charge divided by the linear capacitance, both per unit length of fiber) were V = -53.3 mV (SEM, 1.1 mV), k = 6.3 mV (SEM, 0.3 mV), qmax/cm = 18.0 nC/microF (SEM, 1.1 nC/microF) in the TEA.Cl solution; and V = -35.1 mV (SEM, 1.8 mV), k = 10.5 mV (SEM, 0.9 mV), qmax/cm = 36.3 nC/microF (SEM, 3.2 nC/microF) in the TEA2.SO4 solution. These values of k are smaller than those previously reported for cut twitch fibers and are as small as those reported for intact fibers. If a correction is made for the contributions of currents from under the Vaseline seals, V = -51.2 mV (SEM, 1.1 mV), k = 7.2 mV (SEM, 0.4 mV), qmax/cm = 22.9 nC/microF (SEM, 1.4 nC/microF) in the TEA.Cl solution; and V = -34.0 mV (SEM, 1.9 mV), k = 10.1 mV (SEM, 1.1 mV), qmax/cm = 38.8 nC/microF (SEM, 3.2 nC/microF) in the TEA2.SO4 solution. With this correction, however, the fit of the theoretical curve to the data is poor. A good fit with this correction can be obtained with a sum of two Boltzmann distribution functions. The first has average values V = -33.0 mV (SEM, 2.8 mV), k = 11.0 mV (SEM, 0.5 mV), qmax/cm = 10.6 nC/microF (SEM, 1.0 nC/microF) in the TEA.Cl solution; and V = -20.0 mV (SEM, 3.3 mV), k = 17.0 mV (SEM, 2.0 mV), qmax/cm = 36.4 nC/microF (SEM, 2.3 nC/microF) in the TEA2.SO4 solution. The second has average values V = -56.5 mV (SEM, 1.3 mV), k = 2.9 mV (SEM, 0.4 mV), qmax/cm = 13.2 nC/microF (SEM, 1.0 nC/microF) in the TEA.Cl solution; and V = -41.6 mV (SEM, 1.4 mV), k = 2.5 mV (SEM, 0.8 mV), qmax/cm = 11.8 nC/microF (SEM, 1.7 nC/microF) in the TEA2.SO4 solution. When a fiber is depolarized to near V of the second Boltzmann function, a slowly developing "hump" appears in the ON-segment of the current record.(ABSTRACT TRUNCATED AT 400 WORDS)

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Yeih, Dong-Feng, Lian-Yu Lin, Hung-I. Yeh, Yu-Jun Lai, Fu-Tien Chiang, Chuen-Den Tseng, Shu-Hsun Chu, and Yung-Zu Tseng. "Temporal changes in cardiac force- and flow-generation capacity, loading conditions, and mechanical efficiency in streptozotocin-induced diabetic rats." American Journal of Physiology-Heart and Circulatory Physiology 294, no. 2 (February 2008): H867—H874. http://dx.doi.org/10.1152/ajpheart.00573.2007.

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Diabetes mellitus may result in impaired cardiac contractility, but the underlying mechanisms remain unclear. We aimed to investigate the temporal alterations in cardiac force- and flow-generation capacity and loading conditions as well as mechanical efficiency in the evolution of systolic dysfunction in streptozotocin (STZ)-induced diabetic rats. Adult male Wistar rats were randomized into control and STZ-induced diabetic groups. Invasive hemodynamic studies were done at 8, 16, and 22 wk post-STZ injection. Maximal systolic elastance (Emax) and maximum theoretical flow (Qmax) were assessed by curve-fitting techniques, and ventriculoarterial coupling and mechanical efficiency were assessed by a single-beat estimation technique. In contrast to early occurring and persistently depressed Emax, Qmax progressively increased with time but was decreased at 22 wk post-STZ injection, which temporally correlated with the changes in cardiac output. The favorable loading conditions enhanced stroke volume and Qmax, whereas ventriculoarterial uncoupling attenuated the cardiac mechanical efficiency in diabetic animals. The changes in Emax and Qmax are discordant during the progression of contractile dysfunction in the diabetic heart. In conclusion, our study showed that depressed Qmax and cardiac mechanical efficiency, occurring preceding overt systolic heart failure, are two major determinants of deteriorating cardiac performance in diabetic rats.

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Allen, Simon, and Ivan G. Aghajanyan. "Effect of thermobalancing therapy on chronic prostatitis and chronic pelvic pain syndrome." Journal of Clinical Urology 10, no. 4 (September 20, 2016): 347–54. http://dx.doi.org/10.1177/2051415816671036.

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Background: Type-III chronic prostatitis/chronic pelvic pain syndrome (CP/CPPS) is the most common type of prostatitis. Patients and methods: We ascertained the effect of ‘thermobalancing’ therapy (TT; using Dr Allen’s therapeutic device (DATD)) on CP/CPPS. We measured National Institute of Health Chronic Prostatitis Symptom Index (NIH-CPSI) scores, prostatic volume (PV), and maximum urinary flow rate (Qmax) in one group of 45 patients who underwent TT and a control group that did not have TT, and compared these parameters between groups. Results: Baseline evaluation (pretreatment) of both groups showed no significant difference with regard to age, NIH-CPSI score, PV or Qmax. Pain score decreased in both groups but, in the treatment group, the difference between scores was considerably higher (8.72:1) than that of the non-treatment group. TT decreased quality of life (QoL) significantly whereas, in the control group, it decreased QoL slightly. TT reduced PV significantly whereas, in the control group, PV increased. TT increased Qmax significantly in CP/CPPS patients whereas, in the control group, TT did not elicit a significant change in Qmax. Conclusions: Six-month TT with DATD: (a) reduces CP/CPPS symptoms and improves QoL; (b) reduces PV; (c) increases Qmax. TT could be effective treatment for CP/CPPS.

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Gaugler, Joseph E., Leonard I. Pearlin, and Steven H. Zarit. "Family Involvement Following Institutionalization: Modeling Nursing Home Visits Over Time." International Journal of Aging and Human Development 57, no. 2 (September 2003): 91–117. http://dx.doi.org/10.2190/8mnf-qma3-a5tx-6qq3.

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Gerontological research has emphasized family members' continued involvement in the lives of loved ones following institutionalization. However, many of these studies are cross-sectional in design and do not ascertain how family members' visits change over time. The present study utilized a growth curve analysis to examine preplacement and postplacement predictors of nursing home visits over a two-year period among a sample of 65 caregivers of dementia patients. Intraindividual patterns of change suggested considerable heterogeneity in family visits. Several variables were also significantly predictive ( p < .05) of change in nursing home visits. Spousal caregivers were more likely to report increased visits. Care recipients with greater cognitive impairment following institutionalization experienced increased visits. Caregivers who perceived respect and support from their social network following institutionalization also reported increased visits over the two-year study period. Caregivers who engaged in socially restorative activities after institutionalization reported decreases in visits. The findings provide a more refined understanding of the long-term involvement process following institutionalization.

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Rasmussen, Henrik Højgaard, Preben Bo Mortensen, and Ivan W. Jensen. "Depression and Magnesium Deficiency." International Journal of Psychiatry in Medicine 19, no. 1 (March 1990): 57–63. http://dx.doi.org/10.2190/nkcd-1rb1-qma9-g1vn.

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Keenan, John D., and Robert N. Amundsen. "A Surface Heated Greenhouse Model for Waste Heat Utilization Assessment." Journal of Environmental Systems 19, no. 4 (January 1, 1989): 275–93. http://dx.doi.org/10.2190/l9qn-qmak-dcr1-7kav.

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Pezza, Paul E. "The Viral Model for AIDS: Paradigmatic Dominance, Politics, or Best Approximation of Reality?" International Quarterly of Community Health Education 15, no. 4 (January 1995): 331–48. http://dx.doi.org/10.2190/gy4t-66tg-qmap-87wc.

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In 1981, a non-infectious disease hypothesis was offered by the Centers for Disease Control to explain the cluster of atypical pneumonias which had appeared among gay men in the United States. Although quickly supplanted by the now widely held viral hypothesis and largely ignored by professional and media sources, that view has persisted. This article raises the question of why one explanation for the epidemic of immune system suppression has dominated the discourse on AIDS, despite the anomalies attributed to it by the proponents of other viewpoints. Alternative responses to the question are set forth drawing upon literatures in the philosophy of science and public policy formulation. Some discussion is provided of what the consequences may be if one of the contrarian hypotheses proves to be the closer approximation to the truth about AIDS etiology.

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JUN, HYUN CHUL, HAE PYEONG LEE, SUNG-CHUL YI, KYONG OK YOO, and SEA CHEON OH. "A Kinetic Analysis of the Thermal-Oxidative Decomposition of Polypropylene." Journal of Fire Sciences 18, no. 4 (July 1, 2000): 245–64. http://dx.doi.org/10.1106/bq4t-j160-qma6-4yrm.

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Banthao, Jarupong, Wijai Boonyanusith, Nuanpan Buransri, Panadda Sophatai, and Pojjana Thankrathok. "Saline Inventory Management with Simulation Techniques." ASEAN Journal of Scientific and Technological Reports 24, no. 2 (August 19, 2021): 58–69. http://dx.doi.org/10.55164/ajstr.v24i2.241654.

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This research aims to study an inventory system for managing saline in four categories at a community hospital. The objective is to conduct an Economic Order Quantity (EOQ) and Reorder Point (ROP) to improve the saline inventory management system. Monte Carlo Simulation technique was applied to analyze saline inventory management policies under uncertain demands, namely; s, Qmax(1), s, Qavg(2), s, Qmin(3), T, Qmax(4), T, Qavg(5), T, Qmin(6), T, S (7), and s, S(8). An optimization technique was used to conduct the suitable policy of saline inventory management. The simulation results stated that the most appropriate policy without affecting shortage and overstocking was s,Qmax policy. Moreover, the comparison of each demand quantity (bottle) in each type of saline (A, B, C, and D) among the proposed policies indicated that the s,Qmax policy yielded the lowest overstocking value compared to each demand in each saline type equal to 0.20, 0.38, 0.32, and 0.37, respectively. This study ca

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Shrestha, Rajesh R., Jennifer Pesklevits, Daqing Yang, Daniel L. Peters, and Yonas B. Dibike. "Climatic Controls on Mean and Extreme Streamflow Changes Across the Permafrost Region of Canada." Water 13, no. 5 (February 27, 2021): 626. http://dx.doi.org/10.3390/w13050626.

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Climatic change is affecting streamflow regimes of the permafrost region, altering mean and extreme streamflow conditions. In this study, we analyzed historical trends in annual mean flow (Qmean), minimum flow (Qmin), maximum flow (Qmax) and Qmax timing across 84 hydrometric stations in the permafrost region of Canada. Furthermore, we related streamflow trends with temperature and precipitation trends, and used a multiple linear regression (MLR) framework to evaluate climatic controls on streamflow components. The results revealed spatially varied trends across the region, with significantly increasing (at 10% level) Qmin for 43% of stations as the most prominent trend, and a relatively smaller number of stations with significant Qmean, Qmax and Qmax timing trends. Temperatures over both the cold and warm seasons showed significant warming for >70% of basin areas upstream of the hydrometric stations, while precipitation exhibited increases for >15% of the basins. Comparisons of the 1976 to 2005 basin-averaged climatological means of streamflow variables with precipitation and temperature revealed a positive correlation between Qmean and seasonal precipitation, and a negative correlation between Qmean and seasonal temperature. The basin-averaged streamflow, precipitation and temperature trends showed weak correlations that included a positive correlation between Qmin and October to March precipitation trends, and negative correlations of Qmax timing with October to March and April to September temperature trends. The MLR-based variable importance analysis revealed the dominant controls of precipitation on Qmean and Qmax, and temperature on Qmin. Overall, this study contributes towards an enhanced understanding of ongoing changes in streamflow regimes and their climatic controls across the Canadian permafrost region, which could be generalized for the broader pan-Arctic regions.

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Agbo, Christian A., Venyir M. Ramyil, Nuhu K. Dakum, Samaila I. Shuaibu, Idorenyin C. Akpayak, and Chima G. Ofoha. "Correlation between intravesical prostatic protrusion and maximum flow rate among Nigerian men with Benign Prostatic Hyperplasia." Medical Journal of Zambia 48, no. 3 (January 11, 2022): 207–11. http://dx.doi.org/10.55320/mjz.48.3.946.

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Objective: To determine the correlation between intravesical prostatic protrusion and maximum flow rate in benign prostatic hyperplasia among Nigerian men. Materials and Methods: A cross-sectional prospective study that included patients who presented to the Urology clinic of Jos University Teaching Hospital with clinical features of BPE. Each had IPSS, Qmax and IPP measured in addition to clinical evaluation. Statistical analysis was done using SPSS(R) version 20 (SPSS, IBM, Chicago, IL, USA). Appropriate test statistics were used with p-value < 0.05 considered as significant. Results: Eighty-seven patients aged 40 - 86 years were enrolled in the study period. The means of age, IPSS, Qmax, IPP and PV - were 64.6±10.2 years, 16.7±7.6, 8.2± 3.8 ml/s, 12.9±7.0 mm and 70.1±50.3 mis respectively. IPP correlated negatively with Qmax (r=-0.519, p=0.000). Conclusion: Intravesical prostatic protrusion measurement is non-invasive, easily accessible, reproducible and more cost effective. It showed a significant correlation with Qmax. Therefore, it is a valuable parameter - for evaluation of patients with BPH.

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Mameeva, Olag G., T. P. Kasatkina, and V. S. Podgorsky. "The Role of Carotenoid Pigments in Cr(VI) Tolerance, Biosorption and Bioaccumulation by Rhodotorula mucilaginosa UCM Y-1776 and its Mutants." Advanced Materials Research 20-21 (July 2007): 611–14. http://dx.doi.org/10.4028/www.scientific.net/amr.20-21.611.

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To compare Cr (VI) tolerance, biosorption and bioaccumulation for initial carotenoidsproducing yeast Rhodotorula mucilaginosa UCM Y-1776 and its mutants, twenty stable mutants with various intensity of colors were obtained using nitrosoguanidine (NSG). The ultraviolet was found to be inefficient as a mutagen in our study. Light- and non-pigmented mutants (4L and 2) demonstrated a significant growth inhibition by 30 mg/l Cr (VI) whereas wild strain was able to grow at much higher chromium concentrations (500 mg/l). Cr (VI) sorption ability of R. mucilaginosa UCM Y-1776 was higher than those of mutants. Cr (VI) sorption/uptake parameters (Qmax, b) were found to be close for initial pink-pigmented R. mucilaginosa UCM Y-1776 (Qmax = 950 5M/g), and its light-pigmented mutant 4L (Qmax = 678 5M/g) and non-pigmented mutant 2 (Qmax = 790 5M/g) by non-living biomass. Non-pigmented “white” mutant 2 showed the highest ability to sorb chromium ions by living biomass (Qmax = 1020 mmol/g). The least chromiumtolerant light-pigmented (mutant 4L) and non-pigmented yeasts showed the highest chromium uptake for living biomass. The results showed that the presence of carotenoids did not affect Cr (VI) ions sorption by yeast biomass which could highlight significance of chitin and glucan-mannoprotein complex in chromium biosorption. However pigment absence increased Cr (VI) bioaccumulation by living yeast demonstrating the protective role of carotenoids against hexavalent chromium toxicity.

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Herbig, Tom, Angelica de Oliveira-Costa, Mark J. Devlin, Amber D. Miller, Lyman A. Page, and Max Tegmark. "Mapping the Cosmic Microwave Background Anisotropy:The Second Flight of the QMAP Experiment." Astrophysical Journal 509, no. 2 (December 20, 1998): L73—L76. http://dx.doi.org/10.1086/311768.

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Devlin, Mark J., Angelica de Oliveira-Costa, Tom Herbig, Amber D. Miller, C. Barth Netterfield, Lyman A. Page, and Max Tegmark. "Mapping the Cosmic Microwave Background Anisotropy:The First Flight of the QMAP Experiment." Astrophysical Journal 509, no. 2 (December 20, 1998): L69—L72. http://dx.doi.org/10.1086/311769.

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Itratip, Itratip, and Wardatul Jannah. "ANALISA RASIO DEBIT MAKSIMUM DAN MINIMUM (Qmax/Qmin) SUNGAI UNUS KOTA MATARAM." JUPE : Jurnal Pendidikan Mandala 1, no. 1 (December 4, 2016): 273. http://dx.doi.org/10.58258/jupe.v1i1.81.

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Banjir merupakan salah satu masalah tahunan yang dihadapi Pemerintah Kota Mataram.Penyempitan kapasitas sungai dapat disebabkan oleh sedimentasi (pengendapan) dan sampah..Penelitian ini dilakukan di Sungai Unus Kota Mataram. Sungai unus melewati beberapa kelurahan padat penduduk di Kota Mataram. Data yang diperoleh akan dianalisis dengan metode statistik.Berdasarkan obeservasi dan analisis data dapat disimpulkan bahwa terjadi peningkatan rasio maksimum dan minimum sungai Unus dari 4,04 tahun 2007 menjadi 5,75 pada 2010. Peningkatan rasio debit maksimum dan minimum menyebabkan potensi banjir meningkat

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BARKER, C. M., and C. V. MORR. "Composition and Properties of Spherosil-QMA Whey Protein Concentrate." Journal of Food Science 51, no. 4 (July 1986): 919–23. http://dx.doi.org/10.1111/j.1365-2621.1986.tb11199.x.

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Nagaj, Daniel, and Shay Mozes. "New construction for a QMA complete three-local Hamiltonian." Journal of Mathematical Physics 48, no. 7 (July 2007): 072104. http://dx.doi.org/10.1063/1.2748377.

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Nguimalet, Cyriaque Rufin. "Changements enregistrés sur les extrêmes hydrologiques de l’Oubangui à Bangui (République centrafricaine) : analyse des tendances." Revue des sciences de l’eau 30, no. 3 (March 28, 2018): 183–96. http://dx.doi.org/10.7202/1044246ar.

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Principal affluent septentrional du Congo, l’Oubangui à Bangui a un bassin transfrontalier, s’étendant en RDC (République démocratique du Congo) sur 499 000 km2. Quatre variantes du climat tropical humide influencent son régime selon un gradient pluviométrique sud-nord (1 600-1 000 mm) mais la soudano-guinéenne prédomine sur la majeure partie du bassin. Cet article caractérise les fluctuations des débits (Q) extrêmes (crues et étiages) de l’Oubangui et les tendances enregistrées dans le temps, au regard de la variabilité hydrologique notée depuis 1971. Des données de débits moyens journaliers extrêmes, maximum (Qmax) et minimum (Qmin) sur la période 1911-2014, ont été utilisées. Des tests statistiques (indices d’irrégularité R, recherches des tendances et changements de dates d’apparition des crues et étiages, etc.) leur ont été appliqués pour identifier parmi les périodes hydroclimatiques dans le bassin de l’Oubangui, laquelle détermine l’instabilité et/ou la stabilité du régime de ces extrêmes hydrologiques. Ainsi, les Qmax et Qmin ont connu une période de stabilité grossière, relayée par une baisse relativement plus sévère sur les Qmin (R = 0,64) que sur les Qmax (R = 0,56). Cette tendance est confirmée sur l’évolution du coefficient A (R = 0,56), alors que les indices d’irrégularité R ordinaire (R = 0,51) et décennal (R = 0,83), et le coefficient de tarissement (R = 0,59) présentent des degrés relatifs de hausse ou de sécheresse hydrologique sur l’Oubangui à Bangui. La corrélation Qmax/Qmin montre une tendance moyenne à la hausse (R = 0,51), laquelle ferait noter que la faible réduction des Qmax équilibre la baisse accentuée des Qmin. En effet, cette dégradation hydrologique est diversement notable sur l’Oubangui : 16 % de réduction sur les Qmax depuis 1975 contre 47 % sur les Qmin depuis 1982. Ceci confirme en outre l’ampleur de la sécheresse actuelle, tarissant ou disparaissant de sous-affluents. Aussi, les dates de crue sont elles passées d’octobre (1911-2014) à novembre (1971-2014) et celles d’étiage de mars-avril (1911-2014) à avril (1971-2014). Les crues d’inondation se réduisent aussi au profit des crues moyennes et des étiages de plus en plus prononcés. Cela est établi par les ruptures (segmentation de Hubert) montrant une baisse sur les Qmax (R = 0,84) et Qmin (R = 0,81). Dans ce contexte, une exacerbation de ces tendances positives ou négatives (baisse des crues et étiages, et/ou sévérité des étiages) engendrera de notables impacts sociétaux à Bangui et le long de ce corridor fluvial.

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Botturi, A., C. Simeone, G. Pezzotti, and S. Cosciani Cunico. "Symptom scores and uroflowmetry in the screening of outlet obstruction." Urologia Journal 63, no. 3 (June 1996): 346–50. http://dx.doi.org/10.1177/039156039606300315.

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IPSS has a recognised utility in quantifying the symptoms of outlet obstruction, even if its specificity for benign prostatic hyperplasia has not been proved. Uroflowmetry can also define micturition patterns, but not the degree of obstruction. We correlated the symptom scores and the uroflowmetrograms in the screening of outlet obstruction. A group of 121 patients was evaluated: 111 subjects were observed for voiding symptoms and 10 normal patients were included as a control group. Qmax, IPSS and three new parameters suggested by Nishimoto and coll. (Qmax/T100, TQmax/T100, VV/T100 x Qmax) were considered for all patients. All the values, calculated for each patient, were correlated using Student's T test. A statistically significant correlation between IPSS and Nishimoto's parameters was observed when the latter were indicative of an abnormal flow.

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Matos, Talisson Sáteles, Eduardo Morgan Uliana, Camila Aparecida da Silva Martins, and Luis Miguel Castillo Rapalo. "Regionalization of maximum, minimum and mean streamflows for the Juruena River basin, Brazil." Ambiente e Agua - An Interdisciplinary Journal of Applied Science 15, no. 3 (May 15, 2020): 1. http://dx.doi.org/10.4136/ambi-agua.2418.

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This study aimed to regionalize maximum (Qmax), minimum (Q95), and long-term mean (Qltm) streamflows in the Juruena River Basin to further water-resource planning and management, especially regarding water-use grant rights, streamflow regulation, and hydraulic designs. To do that, a traditional method was used, which relates the interest streamflows with sub-basin physiographic parameters by linear and nonlinear regressions. In summary, the traditional method was efficient for regionalization of Q95, Qltm, and Qmax streamflows for the Juruena River Basin. Moreover, the explanatory variables able to provide the best results for regionalization of Q95 and Qltm stream flows are drainage area, total watercourse length, and sub-basin mean altitude. For Qmax regionalization, the best results were provided by explanatory variables like drainage area, perimeter, and total watercourse length.

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Rosselin, Manon, Guy Prod’hom, Gilbert Greub, and Antony Croxatto. "Performance Evaluation of the Quantamatrix QMAC-dRAST System for Rapid Antibiotic Susceptibility Testing Directly from Blood Cultures." Microorganisms 10, no. 6 (June 14, 2022): 1212. http://dx.doi.org/10.3390/microorganisms10061212.

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Objectives: Rapid antibiotic susceptibility testing (AST) for positive blood cultures can improve patient clinical outcomes if the time to an effective antimicrobial therapy is shortened. In this study, we tested the Quantamatrix dRAST system (QMAC-dRAST), a rapid AST system based on time-lapse microscopic imagery of bacterial colony formation in agarose. Methods: Evaluation of the QMAC-dRAST was performed from 250 monobacterial blood cultures including 130 Enterobacterales, 20 non-fermentative Gram-negative bacteria, 69 staphylococci and 31 enterococci. Blood cultures were recovered from anonymous patients or from spiking experiments to enrich our study with bacterial species and resistant strains. Categorical agreement (CA), minor errors (me), major errors (ME) and very major errors (VME) were calculated in comparison to the results obtained from the BD Phoenix™ M50. Discrepancies between the Phoenix™ M50 and QMAC-dRAST results were investigated using the gradient strip method. The repeatability and reproducibility performance of the QMAC-dRAST was assessed for 16 strains, each strain being tested five times from a spiked blood culture. Results: The overall CAs for Enterobacterales, non-fermentative Gram-negative bacteria, staphylococci and enterococci were 95.1%, 91.2%, 93.4% and 94.5%, respectively. The VME percentage was below 4% for all the groups except for staphylococci, which showed a VME rate of 7%. The median time to result was 6.7 h (range: 4.7–7.9). Repeatability and reproducibility assays showed a high reliability of AST results with best and worst ratios of 98.8% and 99.6% and 95.0% and 98.3%, respectively. Conclusions: The QMAC-dRAST is a fast and reliable system to determine AST directly from monobacterial blood cultures with a major TAT reduction compared to conventional AST testing.

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Mendes, Natalia Gomes de Souza, Roberto Avelino Cecílio, Sidney Sara Zanetti, and Cleber Assis dos Santos. "RELATIONSHIP BETWEEN THE STREAMFLOWS AND PRECIPITATIONS IN ITAPEMIRIM RIVER BASIN." FLORESTA 49, no. 2 (March 29, 2019): 171. http://dx.doi.org/10.5380/rf.v49i2.53994.

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ThThe present paper analyzed the relationship between streamflow and rainfall at the stream of Itapemirim River Watershed (BHRI). The minimum streamflow with duration of seven days (Q7), the average annual streamflow (Qmed) and the annual maximum streamflow (Qmax) of 11 BHRI’s sub-basins were determined. Trends in rainfall and streamflow series were analyzed with Mann-Kandall and Pettitt nonparametric tests. Regression analysis between rainfall and streamflow were established. Results showed no trends on rainfall and Q7 series. Trends in Qmed were found only at one sub-basin and trends in Qmax were found in two sub-basins. The total rainfall was correlated with the streamflow of all the sub-basins. It has been found that annual rainfall amount (Pa) explained considerably variations in Qmed and Q7. Rainfall amounts of the rainiest month (Pmax) showed good correlation to Qmax.

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Evans, Stephen G. "The maximum discharge of outburst floods caused by the breaching of man-made and natural dams." Canadian Geotechnical Journal 23, no. 3 (August 1, 1986): 385–87. http://dx.doi.org/10.1139/t86-053.

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The sudden release of water impounded in natural and man-made reservoirs has been responsible for some major disasters in mountainous regions of the world. Recent natural damming events and failures of natural dams have illustrated the need to examine the nature and magnitude of outburst floods and the behaviour of debris dams in general. An empirical relationship between maximum discharge (Qmax) and volume of water released during the outburst event (Vmax) is established (Qmax = 0.72Vmax0.53) for man-made dams and the relationship is thought applicable to the breaching of natural debris dams (landslides and moraines). This relationship allows a first-order estimate to be made of Qmax in the vicinity of the breach for a given Vmax during the failure of a man-made dam or a natural debris dam. Key words: outburst floods, man-made dams, natural dams, landslide, dam failure.

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Journal articles on the topic '(QMAG)'

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