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Search Results: 1 - 10 of 332919 matches for " Michael J. Ditty "
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Fidelity enhancement by logical qubit encoding
Michael K. Henry,Chandrasekhar Ramanathan,Jonathan S. Hodges,Colm A. Ryan,Michael J. Ditty,Raymond Laflamme,David G. Cory
Physics , 2007, DOI: 10.1103/PhysRevLett.99.220501
Abstract: We demonstrate coherent control of two logical qubits encoded in a decoherence free subspace (DFS) of four dipolar-coupled protons in an NMR quantum information processor. A pseudo-pure fiducial state is created in the DFS, and a unitary logical qubit entangling operator evolves the system to a logical Bell state. The four-spin molecule is partially aligned by a liquid crystal solvent, which introduces strong dipolar couplings among the spins. Although the system Hamiltonian is never fully specified, we demonstrate high fidelity control over the logical degrees of freedom. In fact, the DFS encoding leads to higher fidelity control than is available in the full four-spin Hilbert space.
Integrating an internet-mediated walking program into family medicine clinical practice: a pilot feasibility study
David E Goodrich, Lorraine R Buis, Adrienne W Janney, Megan D Ditty, Christine W Krause, Kai Zheng, Ananda Sen, Victor J Strecher, Michael L Hess, John D Piette, Caroline R Richardson
BMC Medical Informatics and Decision Making , 2011, DOI: 10.1186/1472-6947-11-47
Abstract: In Phase I of the study, we recruited six pairs of physicians and medical assistants from two family practice clinics to assist with the design of a clinical interface. During Phase II, providers used the developed interface to refer patients to a six-week pilot intervention. Provider perspectives were assessed regarding the feasibility of integrating the program into routine care. Assessment tools included quantitative and qualitative data gathered from semi-structured interviews, surveys, and online usage logs.In Phase I, 13 providers used SUH and participated in two interviews. Providers emphasized the need for alerts flagging patients who were not doing well and the ability to review participant progress. Additionally, providers asked for summary views of data across all enrolled clinic patients as well as advertising materials for intervention recruitment. In response to this input, an interface was developed containing three pages: 1) a recruitment page, 2) a summary page, and 3) a detailed patient page. In Phase II, providers used the interface to refer 139 patients to SUH and 37 (27%) enrolled in the intervention. Providers rarely used the interface to monitor enrolled patients. Barriers to regular use of the intervention included lack of integration with the medical record system, competing priorities, patient disinterest, and physician unease with exercise referrals. Intention-to-treat analyses showed that patients increased walking by an average of 1493 steps/day from pre- to post-intervention (t = (36) = 4.13, p < 0.01).Providers successfully referred patients using the SUH provider interface, but were less willing to monitor patient compliance in the program. Patients who completed the program significantly increased their step counts. Future research is needed to test the effectiveness of integrating SUH with clinical information systems over a longer evaluation period.Physical activity is recommended as first-line medical therapy for preventing and ma
Using error correction to determine the noise model
M. Laforest,D. Simon,J. -C. Boileau,J. Baugh,M. Ditty,R. Laflamme
Physics , 2006, DOI: 10.1103/PhysRevA.75.012331
Abstract: Quantum error correcting codes have been shown to have the ability of making quantum information resilient against noise. Here we show that we can use quantum error correcting codes as diagnostics to characterise noise. The experiment is based on a three-bit quantum error correcting code carried out on a three-qubit nuclear magnetic resonance (NMR) quantum information processor. Utilizing both engineered and natural noise, the degree of correlations present in the noise affecting a two-qubit subsystem was determined. We measured a correlation factor of c=0.5+/-0.2 using the error correction protocol, and c=0.3+/-0.2 using a standard NMR technique based on coherence pathway selection. Although the error correction method demands precise control, the results demonstrate that the required precision is achievable in the liquid-state NMR setting.
Quantum Data Bus in Dipolar Coupled Nuclear Spin Qubits
Jingfu Zhang,Michael Ditty,Daniel Burgarth,Colm A. Ryan,C. M. Chandrashekar,Martin Laforest,Osama Moussa,Jonathan Baugh,Raymond Laflamme
Physics , 2009, DOI: 10.1103/PhysRevA.80.012316
Abstract: We implement an iterative quantum state transfer exploiting the natural dipolar couplings in a spin chain of a liquid crystal NMR system. During each iteration a finite part of the amplitude of the state is transferred and by applying an external operation on only the last two spins the transferred state is made to accumulate on the spin at the end point. The transfer fidelity reaches one asymptotically through increasing the number of iterations. We also implement the inverted version of the scheme which can transfer an arbitrary state from the end point to any other position of the chain and entangle any pair of spins in the chain, acting as a full quantum data bus.
Direct observation of quantum criticality in Ising spin chains
Jingfu Zhang,Fernando M. Cucchietti,C. M. Chandrashekar,Martin Laforest,Colm A. Ryan,Michael Ditty,Adam Hubbard,John K. Gamble,Raymond Laflamme
Physics , 2008, DOI: 10.1103/PhysRevA.79.012305
Abstract: We use NMR quantum simulators to study antiferromagnetic Ising spin chains undergoing quantum phase transitions. Taking advantage of the sensitivity of the systems near criticality, we detect the critical points of the transitions using a direct measurement of the Loschmidt echo. We test our simulators for spin chains of even and odd numbers of spins, and compare the experimental results to theoretical predictions.
Development of Soup Powder from Squid Sepioteuthis lessoniana and Shelf-life Assessment During Storage in Laminated Packaging Material
Ditty Chacko,R. Emilin Renitta,Jamila Patterson
Journal of Food Technology , 2013,
Abstract: The soup power was prepared using squid Sepioteuthis lessoniana and their quality was assessed during storage in laminated packaging material. The FFA content (% Oleic acid) increased slowly during the storage period. The TMA-N and TVB-N contents were also increased with the extension of storage period. The Total Plate Count (CFU/g) of the soup powder increased during the storage period. Pathogenic bacteria such as E.coli, Vibrio sp., Salmonella sp., were absent in the samples. The soup powder was acceptable throughout the storage period of 9 months as they organoleptically scored well above the acceptability level.
Population, Development and Deforestation in Songea District, Tanzania  [PDF]
Michael J. Haule
Natural Resources (NR) , 2014, DOI: 10.4236/nr.2014.51004
Abstract:

Deforestation is a phenomenon that forms part of environmental degradation. The fact that deforestation is both a source and contributor to global warming, as it reduces the carbon sinks, cannot be contested [1]. A case study research was carried out in Songea Tanzania aimed at establishing whether there was differential participation of people of different demographic characteristics in those activities that lead into tree cover decline. The study revealed that people of different age group and, sex categories played different roles in activities that lead to deforestation such as felling trees for firewood and felling trees for establishing and/or for expanding farms. It was observed that age group and sex categories influenced one’s involvement or participation in deforestation thus contributing differently by both activity and degree of forest cover reduction. This literally means that people of different demographic characteristics of age and sex contributed differently to the ailing deforestation process. From this end, it is logical and implicit arguing that the identification of actors in deforestation-related activities confirms the disaggregated manner by which population acts on the environment. Development of blanket conservation packages that are not focused on age group and sex categories of members the population in question remains too general and in-effective. To be precise, the planning and implementation of effective conservation initiatives has to take into account demographic characteristics of the population in question. The observed reality is that the population engages with the environment not as a unit but in its disaggregated manner, i.e. based on its demographic sub-categories [2]. The theory behind a successful conservation initiative is based on unveiling the mechanism by which population acts when resulting to deforestation.

The Effect of NeuroGen® Nerve Support Supplement on Pillar Pain after Endoscopic Carpal Tunnel Release  [PDF]
Michael J. Fitzmaurice
Modern Plastic Surgery (MPS) , 2014, DOI: 10.4236/mps.2014.41002
Abstract:

61 patients with clinically diagnosed and electromyographically confirmed carpal tunnel syndrome were enrolled in a prospective study to evaluate the effectiveness of a nerve supplement on pillar pain after carpal tunnel surgery. All of the patients underwent endoscopic carpal tunnel release. 15 of the patients also took the nerve support supplement NeuroGen? as part of their perioperative treatment. The supplement group demonstrated a significantly lower amount of pillar pain (VAS) at initial follow up compared to the control group (1.13 and 4.05 respectively). 46% (7/15) of the supplement group were completely free of pillar pain compared to only 9% (4/46) of the control group at the first follow up. 53% (8/15) of the NeuroGen? group did not require any pain medications compared to 35% (16/46) of the control group. The Nerve supplement NeuroGen? significantly reduces pain after carpal tunnel surgery.

Changes in Human Population Characteristics and Environmental Change in the West Matogoro Catchment Area of Songea, Tanzania  [PDF]
Michael J. Haule
Natural Resources (NR) , 2014, DOI: 10.4236/nr.2014.512064
Abstract: The study was carried out in West Matogoro Catchment Area (WMCA) of Songea, Tanzania, to establish whether for the period between intercensal periods 1978-1988 and 1988-2002, and between 2002 and 2005 characteristics of human population of the area had changed in terms of size, age structure and sex composition. In case it did, then the study had to establish whether such changes may be used to explain the observed forest cover change that occurred in the area. Establishing whether the observed changes were proportionate was important in linking the relationship among factors at hand. The study partly tested the thesis by Liu and others which linked human population changes and their implications to the panda habitat [1]. The findings indicated existence of changes in human population characteristics for the period under review. Variations in terms of population size, age structure and sex composition were realized. While growth was measured by the total population and size of age group of the environmentally active population as identified by the study by Haule, sex composition was determined by sex ratios [2]. The environmentally active age group included males aged 20 to 44 and females aged 10 to 44, i.e. the key actors in felling trees for farm expansion and for firewood respectively. Geographic Information System (GIS) evidence indicated progressive forest cover deterioration. When compared, the changes in human population characteristics and those of the forest cover were noted to be un-proportional. Variations were in terms of increase in human population size and expansion of age group of the “actors” thus attributed to the augmenting deforestation. A positive relationship was demonstrated between population growth, expansion of age segment of the key actors and expanded deforestation. We reiterate that any sustainable measures to address the environmental issues should take into account changes in demographic characteristics of the in Situ population which forms the locus of the interface between population and environment. These factors signify the intensity and duration of the involved forces that characterize forest cover quality.
Nanofat and Platelet Rich Plasma to Enhance Recovery and Minimize Risk of Recurrence after Endoscopic Carpal Tunnel Release  [PDF]
Michael J. Fitzmaurice
Modern Plastic Surgery (MPS) , 2019, DOI: 10.4236/mps.2019.91002
Abstract: Carpal tunnel release is one of the most common and surgery procedures performed. Complications and recurrence of the condition can occur up to 20% of cases. We describe a technique of utilizing the nanofat and platelet rich plasma to successfully enhance healing and minimize risk of recurrence after endoscopic carpal tunnel release. This patient had exceptionally fast recovery, resuming work in one day and excellent grip strength and a full functioning level at his two-week follow-up. After one year he continues to demonstrate a complete resolution of symptoms and full function without any evidence of recurrence or complications.
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