Relevant bibliographies by topics / Coherence

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'Coherence'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 July 2024

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Journal articles on the topic "Coherence"

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Concha, Soledad, Soledad Aravena, Carmen Julia Coloma, and Verónica Romero. "Escritura expositiva en tres niveles de escolaridad: coherencia y dominio de recursos lingüísticos." Literatura y Lingüística, no. 21 (June 26, 2015): 75. http://dx.doi.org/10.29344/0717621x.21.135.

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ResumenEl estudio explora la capacidad de estudiantes de tres niveles de escolaridad –5° Básico,1° Medio y 4° Medio– para producir textos expositivos coherentes utilizando los recursos lingüísticos con que se construye la coherencia local en la escritura expositiva. Se trabajó con alumnos de dos colegios municipalizados de Santiago, quienes redactaron textos expositivos a partir de un ítem de respuesta abierta extensa. Sus textos fueron codificados con dos rúbricas para medir la coherencia local (CL) y los recursos lingüísticos involucrados en la coherencia local (RCL). Los resultados muestran un ascenso significativo en el desempeño para la medida RCL a lo largo de los tres niveles escolares,pero no para la medida CL.Palabras clave: Producción escrita, texto expositivo, coherencia, recursos lingüísticosAbstractThe study focused on 5th grade, 9th grade and 12th grade students’ ability to produce coherent expository texts and to use the linguistic resources with which local coherenceis achieved in expository writing. Participants belonged to two public schools in Santiago,Chile, and their expository writing was elicited with writing prompts. Products of writing were coded using two different rubrics: Local Coherence (LC) and Local Coherence Resources (LCR). Results reveal a significant improvement for the measure LCR across age groups, but not for LC.Key words: Writing, expository text, coherence, linguistic resources
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Le, Thai-Hoa, and Dong-Anh Nguyen. "TEMPORO-SPECTRAL COHERENT STRUCTURE OF TURBULENCE AND PRESSURE USING FOURIER AND WAVELET TRANSFORMS." ASEAN Journal on Science and Technology for Development 25, no. 2 (November 22, 2017): 405–17. http://dx.doi.org/10.29037/ajstd.271.

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Studying the spatial distribution in coherent fields such as turbulent and turbulent-induced force ones is important to model and evaluate turbulent-induced forces and response of structures on the turbulent flows. Turbulent field-based coherent function is commonly used for the spatial distribution characteristic of induced forces in the frequency domain. This paper will focus to study spectral coherent structure of turbulence and forces in not only the frequency domain using conventional Fourier transform-based coherence, but also temporo-spectral coherent one in the time-frequency plane thanks to wavelet transform-based coherence for more understanding of the turbulence and force coherences and their spatial distributions. Effects of spanwise separations, bluff body flow and flow conditions on coherent structures of turbulence and induced pressure, comparison between turbulence and pressure coherences as well as intermittency of coherent structure in the time-frequency plane will be investigated here.
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Jung, Jungkyo, and Sang-Ho Yun. "Evaluation of Coherent and Incoherent Landslide Detection Methods Based on Synthetic Aperture Radar for Rapid Response: A Case Study for the 2018 Hokkaido Landslides." Remote Sensing 12, no. 2 (January 13, 2020): 265. http://dx.doi.org/10.3390/rs12020265.

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Damage mapping using Synthetic Aperture Radar (SAR) imagery has been studied in recent decades to support rapid response to natural disasters. Many researches have been developing coherent and incoherent change detection. However, their performances can vary depending on the types of the damages, the characteristics of the scatterers and the corresponding capability of algorithms. In particular, the coherence-based methods have been used as promising detectors over urban areas where high coherences are observed, but their detection accuracies still remain controversial over the area where low coherences are mainly observed such as the 2018 Hokkaido landslides. In order to understand the characteristics of landslide (damage) detectors for low-coherence areas and find an alternative and complementary method, we designed the coherence difference, coherence normalized difference, log-ratio, intensity correlation difference, and normalized differences of the intensity correlation assuming limited availability of dataset, and also developed multi-temporal algorithms using the coherence, intensity, and intensity correlation. They were tested and evaluated using multiple polygons extracted from aerial photos. We were able to observe that the multi-temporal intensity correlation method has the potential to detect the landslides over the low coherence region and all types of land uses.
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Zhu, Ruidan, Meixia Ruan, Hao Li, Xuan Leng, Jiading Zou, Jiayu Wang, Hailong Chen, Zhuan Wang, and Yuxiang Weng. "Vibrational and vibronic coherences in the energy transfer process of light-harvesting complex II revealed by two-dimensional electronic spectroscopy." Journal of Chemical Physics 156, no. 12 (March 28, 2022): 125101. http://dx.doi.org/10.1063/5.0082280.

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The presence of quantum coherence in light-harvesting complex II (LHCII) as a mechanism to understand the efficiency of the light-harvesting function in natural photosynthetic systems is still debated due to its structural complexity and weak-amplitude coherent oscillations. Here, we revisit the coherent dynamics and clarify different types of coherences in the energy transfer processes of LHCII using a joint method of the high-S/N transient grating and two-dimensional electronic spectroscopy. We find that the electronic coherence decays completely within 50 fs at room temperature. The vibrational coherences of chlorophyll a dominate over oscillations within 1 ps, whereas a low-frequency mode of 340 cm−1 with a vibronic mixing character may participate in vibrationally assisted energy transfer between chlorophylls a. Our results may suggest that vibronic mixing is relevant for rapid energy transfer processes among chlorophylls in LHCII.
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Fan, Zhaobing, Zewen Shan, and Haitao Ma. "Partial Recovery of Coherence Loss in Coherence-Assisted Transformation." Entropy 25, no. 10 (September 24, 2023): 1375. http://dx.doi.org/10.3390/e25101375.

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Coherence-assisted transformation under incoherent operations is discussed. For transformation from the pure state to the mixed state, we show that the coherence loss can be partially recovered by adding auxiliary coherent states. First, we discuss the coherence-assisted transformation for qubit states and give the sufficient and necessary condition for the partial recovery of coherence loss, and the maximum of the recovery of coherence loss is also studied in this case. Second, the maximally coherent state can be obtained in the above recovery scheme, so we give the full characterization of obtaining the maximally coherent state in a qubit system. Finally, we show that the coherence-assisted transformation for arbitrary finite-dimensional main coherent states and low-dimensional auxiliary coherent states is always possible, and the coherence loss also can be partially recovered in these cases.
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Hájek, Alan. "Is Strict Coherence Coherent?" Dialectica 66, no. 3 (September 2012): 411–24. http://dx.doi.org/10.1111/j.1746-8361.2012.01310.x.

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Qin, Lei, Frank L. Vernon, Christopher W. Johnson, and Yehuda Ben‐Zion. "Spectral Characteristics of Daily to Seasonal Ground Motion at the Piñon Flats Observatory from Coherence of Seismic Data." Bulletin of the Seismological Society of America 109, no. 5 (August 27, 2019): 1948–67. http://dx.doi.org/10.1785/0120190070.

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Abstract We investigate coherences of seismic data recorded during three years (2015–2017) at the Piñon Flats Observatory (PY) array and a collocated 148 m deep borehole station B084, along with oceanic data from a buoy southwest of the PY array. Seismic and barometric recordings at PY stations are analyzed with a multitaper spectral technique. The coherence of signals from seismic sources is >0.6 at 0.05–8 Hz between closely spaced (<65 m) surface stations and decreases to ∼0.2 in frequency bands in which the wavelengths are smaller than interstation distances. There are several local coherence increases at 1–8 Hz between nearby (<65 m) surface stations, whereas large coherence values between a surface and 148 m deep borehole stations are only present at the secondary microseism (∼0.14 Hz). These points to significant modification of seismic recordings in the top crust, and those continual near‐surface failures might produce shallow rapidly attenuating signals at surface stations. Incoherent local atmospheric effects induce incoherent seismic signals in low‐ and high‐frequency ranges through different coupling mechanisms. Between 0.003 and 0.05 Hz, atmospheric loadings generate ground tilts that contaminate the two horizontal seismic recordings and decrease their coherence, whereas the vertical component is less affected. At 1–8 Hz, coupling of atmospheric pressure with surface structures transmits incoherent signals into the ground, degrading the seismic coherence in all three components. The two horizontal coherences show seasonal variations with extended coherent frequency bands in winter and spring, likely to be produced by seasonal variations in microseisms and local ground tilts. The coherences also contain high anomalies between 2 and 4 Hz resulting from anthropogenic activities. The results provide useful information on instrument characteristics and variations in the shallow crustal response to earthquakes, seasonal and ambient sources of seismic energy, along with atmospheric pressure–temperature changes and anthropogenic activities.
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Wang, Bang-Hai, Zi-Heng Ding, Zhihao Ma, and Shao-Ming Fei. "Common Coherence Witnesses and Common Coherent States." Entropy 23, no. 9 (August 31, 2021): 1136. http://dx.doi.org/10.3390/e23091136.

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We show the properties and characterization of coherence witnesses. We show methods for constructing coherence witnesses for an arbitrary coherent state. We investigate the problem of finding common coherence witnesses for certain class of states. We show that finitely many different witnesses W1,W2,⋯,Wn can detect some common coherent states if and only if ∑i=1ntiWi is still a witnesses for any nonnegative numbers ti(i=1,2,⋯,n). We show coherent states play the role of high-level witnesses. Thus, the common state problem is changed into the question of when different high-level witnesses (coherent states) can detect the same coherence witnesses. Moreover, we show a coherent state and its robust state have no common coherence witness and give a general way to construct optimal coherence witnesses for any comparable states.
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Baker, Stuart N., Elizabeth M. Pinches, and Roger N. Lemon. "Synchronization in Monkey Motor Cortex During a Precision Grip Task. II. Effect of Oscillatory Activity on Corticospinal Output." Journal of Neurophysiology 89, no. 4 (April 1, 2003): 1941–53. http://dx.doi.org/10.1152/jn.00832.2002.

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Recordings from primary motor cortex (M1) during periods of steady contraction show oscillatory activity; these oscillations are coherent with the activity of contralateral muscles. We investigated synchronization of corticospinal output neurons with the oscillations, which could provide the pathway for their transmission to the spinal motoneurons. One hundred seventy-six antidromically identified pyramidal tract neurons (PTNs) were recorded from M1 in three macaque monkeys trained to perform a precision grip task. Local field potentials (LFP) were simultaneously recorded. All analysis was confined to the hold period of the task, where our previous work has shown that there is the strongest oscillatory activity. Coherence was calculated between LFP and PTN discharge. Significant coherence was seen in three bands, with frequencies of 10–14, 17–31, and 34–44 Hz. Coherence values were low, with the majority of PTN–LFP coherences having a peak lower than 0.05. The phase of coherence was approximately −π/2 radians for each band (with LFP polarity defined as negative upward), although there was some dispersion of phase across the population of PTNs. Coherence was also calculated between pairs of PTNs that had been simultaneously recorded. Where there was significant coherence, it was also generally smaller than 0.05. The phase of PTN–PTN coherence clustered around zero radians. A computer model was constructed to assist the interpretation of the experimental results. It simulated an integrate-and-fire neuron responding to synaptic inputs. A fraction of the synaptic inputs was synchronized with a simulated LFP; the remainder were uncorrelated with it. The model showed that coherence between the LFP and the output spike train considerably underestimated the fraction of synchronized inputs. Additionally, for a given fraction of synchronized inputs, coherence was smaller for high- compared with low-frequency bins. Cell discharge rate also influenced the spike–LFP coherence: coherence was higher for simulations in which the cell discharged at a faster rate. Thus although levels of PTN–LFP coherence seen experimentally were low, a considerable proportion of the input to the PTN must be synchronized with the global oscillatory activity recorded by the LFP. The low LFP–PTN coherences do however indicate that cortical oscillations are transmitted with only low fidelity in the discharge of a single PTN. Using further computer simulations, it was demonstrated that a small population of PTNs could encode the cortical oscillatory signal effectively, since the action of averaging across the population improves the signal:noise ratio. The oscillations will therefore be effectively transmitted to spinal motoneurons, and this has important consequences for the possible role of oscillations in motor control of the hand.
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LIM, WOOCHANG, and SANG-YOON KIM. "STOCHASTIC SPIKING COHERENCE IN COUPLED SUBTHRESHOLD MORRIS-LECAR NEURONS." International Journal of Modern Physics B 23, no. 05 (February 20, 2009): 703–10. http://dx.doi.org/10.1142/s0217979209049991.

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We consider a large population of globally coupled subthreshold Morris-Lecar neurons. By varying the noise intensity D, we numerically investigate stochastic spiking coherence (i.e., collective coherence between noise-induced neural spikings). As D passes a lower threshold, a transition from an incoherent to a coherent state occurs because of a constructive role of noise to stimulate coherence between noise-induced spikings. However, when passing a higher threshold of D, another transition from a coherent to an incoherent state takes place due to a destructive role of noise to spoil the spiking coherence. Such an incoherence-coherence-incoherence transition is well-described in terms of the order parameter which is just the mean square deviation of the global potential. In the coherent regime, we also characterize the degree of stochastic spiking coherence by using a coherence measure which reflects the degree of "resemblance" of the global potential to the local potential. Thus, stochastic spiking coherence with large coherence measure is found to occur over a large range of intermediate noise intensity.
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Dissertations / Theses on the topic "Coherence"

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Alarousu, E. (Erkki). "Low coherence interferometry and optical coherence tomography in paper measurements." Doctoral thesis, University of Oulu, 2006. http://urn.fi/urn:isbn:9514282140.

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Abstract This thesis describes the application of Low Coherence Interferometry (LCI) and Optical Coherence Tomography (OCT) in paper measurements. The developed measurement system is a combination of a profilometer and a tomographic imaging device, which makes the construction versatile and applicable in several paper measurement applications. The developed system was first used to measure the surface structure of paper. Different grades of paper were selected to provide maximum variation in surface structure. The results show that the developed system is capable of measuring grades of paper from rough base paper to highly coated photo printing paper. To evaluate the developed system in surface characterization, the roughness parameters of five laboratory-made paper samples measured with the developed system and with a commercial optical profilometer were compared. A linear correlation was found with roughness parameters Ra and Rq. Next, the surface quality of paper was evaluated using LCI, a Diffractive Optical Element Based Glossmeter (DOG), and a commercial glossmeter. The results show linear correlation between Ra and gloss measured with the commercial glossmeter. The roughness Ra and averaged gloss measured with the DOG didn't give such a correlation, but a combination of these techniques provided local properties of gloss and surface structure, which can be used to evaluate the local surface properties of paper. In the next study, determination of the filler content of paper using OCT is discussed. The measurement results show clear correspondence of the slope of the averaged logarithmic fringe signal envelope and the filler content. The last studies focus on 2D and 3D imaging of paper using OCT and begin with imaging of a self-made wood fiber network. The visibility of the fibers was clear. Next, several refractive index matcing agents are studied by means of light transmittance and OCT measurements to find the best possible agent for enhancing the imaging depth of OCT in paper. Benzyl alcohol was found to have the best possible combination of optical, evaporation, and sorption characteristics, and it is applied in 2D and 3D visualizations of copy paper.
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Xiong, Han. "Coherence-induced entanglement." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3797.

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Coherence and entanglement are the two key concepts that distinguish quantum mechanics from classical mechanics. Many novel phenomena occuring in the quantum world are due to these two “physical quantities”. They also play essential roles in quantum computation and quantum information. For example, coherence, which says that a quantum mechanical system could be in a superposition state, makes the quantum parallel computing scheme possible; and entanglement, which says that two quantum systems separated in space could be in an intervened state, is the key factor in various quantum teleportation algorithms. We have studied entanglement generation in various systems. We found that with atomic coherence, entanglement could be generated between two thermal fields with arbitrarily high temperatures. We also found that temperature difference instead of the purity of state is essential for the entanglement generation between an atom and a thermal field. We discovered that correlated spontaneous emission lasers (CELs) could be used to generate bright entanglement laser beams. As a special case of CEL systems, we studied entanglement generation in Non-degenerate Optical Parametric Amplifiers (NOPAs). We performed the input-output calculations for a NOPA system and showed that the two output optical beams are still entangled. This justifies our idea that CEL (or NOPA) systems can be used as an ideal entanglement source for various quantum information schemes. From an experimental point of view, we considered the effects of pumping fluctuations on entanglement generation in CEL and NOPA systems. We found that these fluctuations, especially the phase diffusion processes, in the pump laser would greatly reduce the entanglement generated in such systems.
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Hunting, John. "Sensibility and coherence." Thesis, University of Ottawa (Canada), 1989. http://hdl.handle.net/10393/5840.

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Sun, Fangzheng. "Kernel Coherence Encoders." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-theses/252.

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In this thesis, we introduce a novel model based on the idea of autoencoders. Different from a classic autoencoder which reconstructs its own inputs through a neural network, our model is closer to Kernel Canonical Correlation Analysis (KCCA) and reconstructs input data from another data set, where these two data sets should have some, perhaps non-linear, dependence. Our model extends traditional KCCA in a way that the non-linearity of the data is learned through optimizing a kernel function by a neural network. In one of the novelties of this thesis, we do not optimize our kernel based upon some prediction error metric, as is classical in autoencoders. Rather, we optimize our kernel to maximize the "coherence" of the underlying low-dimensional hidden layers. This idea makes our method faithful to the classic interpretation of linear Canonical Correlation Analysis (CCA). As far we are aware, our method, which we call a Kernel Coherence Encoder (KCE), is the only extent approach that uses the flexibility of a neural network while maintaining the theoretical properties of classic KCCA. In another one of the novelties of our approach, we leverage a modified version of classic coherence which is far more stable in the presence of high-dimensional data to address computational and robustness issues in the implementation of a coherence based deep learning KCCA.
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Huang, David. "Optical coherence tomography." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12675.

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Kramer, Emily Hope. "Musical Discourse Coherence." Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1336857806.

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Muscat, Sarah. "Optical coherence tomography." Thesis, Connect to e-thesis, 2003. http://theses.gla.ac.uk/630/.

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Thesis (Ph.D.) - University of Glasgow, 2003.
Ph.D. thesis submitted to the Department of Cardiovascular and Medical Sciences, Faculty of Medicine, University of Glasgow, 2003. Includes bibliographical references. Print version also available.
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Younan, Elizabeth Mary. "Coherence through Pitch." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/18742.

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Recent musicological output has viewed neither the aesthetic concept of organicism nor the methodology of formalistic music analysis in a favourable light. Both organicism and formalistic music analysis in the current age have been plagued by criticisms concerning its validity, purpose, and function. Thus there has been a decrease in the perceived value and usefulness of both organicism as means of rendering contemporary post-tonal compositions as cohesive entities and music analysis as a means of elucidating such organic musical construction. My aims for my thesis are, at its simplest, two-fold. Drawing upon the aesthetics of organicism and cohesion as seen in Schoenberg’s writings, I aim primarily to espouse both the purpose and effectiveness of organicism as well as music analysis in rendering art music of the twentieth and twenty-first centuries comprehensible. I also argue that organicism must be accompanied by contrast in order to maintain musical variety and interest, and I explain how I, as a composer, satisfy these two imperatives in my own compositional output. A comprehensive motivic analysis of selected works from the twentieth century in conjunction with analyses of my own compositions created as part of this degree will not only demonstrate the presence of organicism but will also argue its value in achieving coherence in post-tonal music. Investigating the intervallic properties inherent in the primary musical material of each work will demonstrate the multifaceted ways in which the composer in question takes advantage of these properties to create a work that is simultaneously diverse yet unified in its structure. A consideration of the work’s construction on both the micro and macro scale (that is, the ways in which musical cells both interact and develop on local and global levels) will demonstrate how the composer has generated an organic structural trajectory through the manipulation of a small musical cell; it will also demonstrate how such an organic structure can create meaningful and coherent listenings of the work. I aim to convey the ways in which I and the selected composers develop material to achieve variety whilst maintaining unifying musical elements. I hope to convince the reader of the value of employing a motivic-based approach when composing post-tonal works due to its possibilities of ensuring musical coherence.
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Le, Jeune Paul. "Coherence optique, coherence de spin dans les puits quantiques a semiconducteurs." Toulouse, INSA, 1998. http://www.theses.fr/1998ISAT0018.

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Ce memoire est une contribution a l'etude des coherence optique et coherence de spin dans les puits quantiques a semiconducteur. Les manifestations de ces coherences sont observees sur la luminescence au cours d'experiences de spectroscopie optique ultra-rapide. La conservation de la coherence de spin de l'electron ou de l'exciton conduit a la mesure precise des facteurs de lande de l'electron, du trou, ou de l'exciton, a l'aide d'experiences de battements quantiques de spin. La conservation de la coherence optique de l'exciton permet le controle coherent de la phase de l'etat quantique d'un systeme excitonique. Nous mesurons ainsi le temps de dephasage optique en etudiant la perte de la coherence. A forte densite, nous etudions les effets de l'interaction d'echange interexcitons. Outre l'impact de cette interaction sur la coherence optique, nous rapportons de nouvelles manifestations touchant a la largeur des raies spectrales, a leur decalage, ainsi qu'un phenomene de saturation de l'absorption.
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De, Coning Cedric Hattingh. "Complexity, peacebuilding and coherence : implications of complexity for the peacebuilding coherence dilemma." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71891.

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Thesis (PhD)--Stellenbosch University, 2012.
ENGLISH ABSTRACT: This dissertation explores the utility of using Complexity studies to improve our understanding of peacebuilding and the coherence dilemma, which is regarded as one of the most significant problems facing peacebuilding interventions. Peacebuilding is said to be complex, and this study investigates what this implies, and asks whether Complexity could be of use in improving our understanding of the assumed causal link between coherence, effectiveness and sustainability. Peacebuilding refers to all actions undertaken by the international community and local actors to consolidate the peace – to prevent a (re)lapse into violent conflict – in a given conflict-prone system. The nexus between development, governance, politics and security has become a central focus of the international effort to manage transitions, and peacebuilding is increasingly seen as the collective framework within which these diverse dimensions of conflict management can be brought together in one common framework. The coherence dilemma refers to the persistent gap between policy-level assumptions about the value and causal role of coherence in the effectiveness of peacebuilding and empirical evidence to the contrary from peacebuilding practice. The dissertation argues that the peacebuilding process is challenged by enduring and deep-rooted tensions and contradictions, and that there are thus inherent limits and constraints regarding the degree to which coherence can be achieved in any particular peacebuilding context. On the basis of the application of the general characteristics of Complexity to peacebuilding, the following three recommendations reflect the core findings of the study: (1) Peacebuilders need to concede that they cannot, from the outside, definitively analyse complex conflicts and design ‘solutions’ on behalf of a local society. Instead, they should facilitate inductive processes that assist knowledge to emerge from the local context, and such knowledge needs to be understood as provisional and subject to a continuous process of refinement and adaptation. (2) Peacebuilders have to recognise that self-sustainable peace is directly linked to, and influenced by, the extent to which a society has the capacity, and space, to selforganise. For peace consolidation to be self-sustainable, it has to be the result of a home-grown, bottom-up and context-specific process. (3) Peacebuilders need to acknowledge that they cannot defend the choices they make on the basis of pre-determined models or lessons learned elsewhere. The ethical implications of their choices have to be considered in the local context, and the effects of their interventions - intended and unintended - need to be continuously assessed against the lived-experience of the societies they are assisting. Peacebuilding should be guided by the principle that those who will have to live with the consequences should have the agency to make decisions about their own future. The art of peacebuilding lies in pursuing the appropriate balance between international support and home-grown solutions. The dissertation argues that the international community has, to date, failed to find this balance. As a result, peacebuilding has often contributed to the very societal weaknesses and fragilities that it was meant to resolve. On the basis of these insights, the dissertation concludes with a call for a significant re-balancing of the relationship between international influence and local agency, where the role of the external peacebuilder is limited to assisting, facilitating and stimulating the capacity of the local society to self-organise. The dissertation thus argues for reframing peacebuilding as something that must be essentially local.
AFRIKAANSE OPSOMMING: Hierdie proefskrif ondersoek die toepaslikheid van Kompleksiteitstudies om ons begrip van vredesbou en die dilemma van koherensie te verbeter, wat as een van die gewigtigste probleme vir die toetrede tot vredesbou beskou kan word. Vredesbou word as kompleks beskou en die implikasies van hierdie siening word in hierdie proefskrif ondersoek. Dienooreenkomstig word die vraag na die nut van Kompleksiteitstudies vir die verbetering van ons begrip van die veronderstelde kousale verband tussen koherensie, doeltreffendheid en volhoubaarheid aangespreek. Vredesbou verwys na alle handelinge wat deur die internasionale gemeenskap en plaaslike belanghebbendes onderneem word om vrede binne ʼn gegewe sisteem, wat neig na konflik, te konsolideer om sodoende ’n (her)verval in gewelddadige konflik te voorkom. Die aanknopingspunt tussen ontwikkeling, staatsbestuur, staatkunde en sekuriteit is tans die sentrale fokus van die internasionale poging om sodanige oorgange te beheer, en vredesbou word toenemend as ’n kollektiewe raamwerk beskou, waarbinne hierdie onderskeie dimensies van konflikbestuur in een gemeenskaplike raamwerk saamgebring kan word. Die koherensiedilemma verwys na die voortdurende gaping tussen beleidsvlakaannames ten opsigte van die waarde en kousale rol van koherensie vir die doeltreffendheid van vredesboupogings en empiriese data vanuit die vredesboupraktyk wat hierdie aanvaarde kousale verband weerspreek. Die proefskrif toon dat vredesboupogings uitgedaag word deur voortdurende en diepgewortelde spanninge en teenstrydighede, en dat daar dus inherente beperkings en stremmings is ten opsigte van die mate waartoe koherensie binne enige spesifieke vredesboukonteks moontlik is. Op grond van die toepassing van die algemene kenmerke van Kompleksiteitstudies op die vredesbouproses, weerspieël die volgende drie aanbevelings die kernbevindings van die studie: (1) Vredesbouers moet toegee dat hulle nie daartoe in staat is om komplekse konflikte van buite af bepalend te analiseer en ‘oplossings’ namens ’n plaaslike gemeenskap te ontwerp nie. Hulle behoort eerder induktiewe prosesse te fasiliteer om ondersteuning te bied sodat kennis uit die plaaslike konteks na vore kom, en sodanige kennis moet as voorlopig en onderhewig aan ’n voortdurende proses tot verfyning en aanpassing, verstaan word. (2) Vredesbouers moet besef dat die selfvolhoubaarheid van vrede direk verband hou met, en beïnvloed word deur, die mate waartoe ’n gemeenskap oor die vermoë tot en ruimte vir selforganisering beskik. Vir vredeskonsolidering om selfvolhoubaar te wees, moet die proses wat daartoe aanleiding gee inheems, van ‘onder-na-bo’ en konteks-spesifiek wees. (3) Vredesbouers moet aanvaar dat hulle nie die besluite wat hulle neem op grond van voorafbestaande modelle of lesse wat elders geleer is kan regverdig nie. Die etiese implikasies van hulle besluite moet in terme van die plaaslike konteks beoordeel word, en die effekte van hulle ingrepe – bepland en onbepland – moet voortdurend opgeweeg word teen die daaglikse ervaring van die samelewings wat bygestaan word. Vredesbehoupogings behoort gelei te word deur die beginsel dat diegene wat met die gevolge van die proses sal moet saamleef, die agentskap behoort te hê om besluite oor hulle eie toekoms te neem. Die kuns van vredesbou lê in die vasstel van ’n toepaslike balans tussen internasionale ondersteuning en inheemse oplossings. Die proefskrif se argument is dat die internasionale gemeenskap tot dusver daarin gefaal het om hierdie balans te vind. As gevolg hiervan het pogings tot vredesbou dikwels bygedra tot die presiese swakhede en broosheid in die gemeenskap wat dit veronderstel was om aan te spreek. Op grond van hierdie insigte sluit die proefskrif af met ’n beroep tot ’n betekenisvolle herbalansering van die verhouding tussen internasionale invloed en plaaslike agentskap, waarin die rol van die eksterne vredesbouer beperk moet word tot die ondersteuning, fasilitering en stimulering van die plaaslike gemeenskap se vermoë tot selforganisering. Die proefskrif bepleit dus dat vredesbou herontwerp word binne ’n essensieel plaaslike raamwerk.
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Books on the topic "Coherence"

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Ramírez, David, Ignacio Santamaría, and Louis Scharf. Coherence. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-13331-2.

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Pötz, Walter, Ulrich Hohenester, and Jaroslav Fabian, eds. Quantum Coherence. Berlin/Heidelberg: Springer-Verlag, 2006. http://dx.doi.org/10.1007/11398448.

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New trends in quantum coherence and nonlinear optics. Hauppauge, NY: Nova Science Publishers, 2009.

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Bernardes, Rui, and José Cunha-Vaz, eds. Optical Coherence Tomography. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27410-7.

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Hyvärinen, Matti, Lars-Christer Hydén, Marja Saarenheimo, and Maria Tamboukou, eds. Beyond Narrative Coherence. Amsterdam: John Benjamins Publishing Company, 2010. http://dx.doi.org/10.1075/sin.11.

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Heydrich, Wolfgang, Fritz Neubauer, János S. Petöfi, and Emil Sözer, eds. Connexity and Coherence. Berlin, Boston: DE GRUYTER, 1989. http://dx.doi.org/10.1515/9783110854831.

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Girach, Aniz, and Robert C. Sergott, eds. Optical Coherence Tomography. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-24817-2.

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Drexler, Wolfgang, and James G. Fujimoto, eds. Optical Coherence Tomography. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-77550-8.

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Saxena, Sandeep. Optical coherence tomography. New York, NY: McGraw-Hill Medical, 2008.

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1942-, Meredith Travis A., and Saxena Sandeep, eds. Optical coherence tomography. New York, NY: McGraw-Hill, 2008.

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Book chapters on the topic "Coherence"

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Kirby, Jonathan. "Admittance, Coherency and Coherence." In Spectral Methods for the Estimation of the Effective Elastic Thickness of the Lithosphere, 171–211. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-10861-7_5.

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Neumann, Knut. "Coherence." In Encyclopedia of Science Education, 1–2. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-6165-0_42-4.

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Deymier, Pierre, and Keith Runge. "Coherence." In Sound Topology, Duality, Coherence and Wave-Mixing, 163–259. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-62380-1_4.

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Foucart, Simon, and Holger Rauhut. "Coherence." In A Mathematical Introduction to Compressive Sensing, 111–31. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-0-8176-4948-7_5.

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Neumann, Knut. "Coherence." In Encyclopedia of Science Education, 172–74. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-2150-0_42.

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Stockwell, Peter. "Coherence." In The Language of Surrealism, 115–32. London: Macmillan Education UK, 2017. http://dx.doi.org/10.1057/978-1-137-39219-0_7.

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Moscoso, Javier. "Coherence." In Pain, 165–90. London: Palgrave Macmillan UK, 2012. http://dx.doi.org/10.1057/9781137284235_8.

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Kress, Ken. "Coherence." In A Companion to Philosophy of Law and Legal Theory, 521–38. Oxford, UK: Wiley-Blackwell, 2010. http://dx.doi.org/10.1002/9781444320114.ch36.

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DiMarzio, Charles A. "Coherence." In Optics for Engineers, 399–430. 2nd ed. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781315157047-10.

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Bennett, Richard, and Joseph E. Oliver. "Coherence." In Acceptance and Commitment Therapy, 40–41. Milton Park, Abingdon, Oxon ; New York, NY : Routledge, 2019.: Routledge, 2019. http://dx.doi.org/10.4324/9781351056144-17.

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Conference papers on the topic "Coherence"

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Gershgoren, Erez, Eli Gordon, Dimitri Star, and Sanford Ruhman. "Role of symmetry breaking in transfer of vibrational coherence from reactant to product." In International Conference on Ultrafast Phenomena. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/up.1996.wd.3.

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Impulsive photodissociation of triiodide; I3− + hν → I2− + I has been demonstrated to generate vibrationally excited and phase coherent diiodide ion fragments in polar solvents1. Investigations of the mechanisms which allow the phase coherent molecular evolution to transcend bond fission and solvent collisions, stresses the importance of symmetry breaking prior to excitation in molding product vibrational coherence2. Centro-symmetric and linear I3− must decide which of its ends will become the I2− radical, and which atomic iodine. If this decision is postponed too long, collision with solvent may precede it and wash out phase coherence of nuclear motion. Preexisting broken symmetry facilitates a rapid dynamic decision. Subtler effects of a delayed decision involve deposition of excess energy into translation and vibration of the products again show advantages of early symmetry breaking in producing fragment coherence3. The purpose of the present study is to test this hypothesis by comparing dissociation dynamics from centro-symmetric and asymmetrical initial states.
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Dahan, Nir, Avi Niv, Yuri Gorodetski, Vladimir Kleiner, and Erez Hasman. "Enhanced Coherency of Thermal Emission From SiC by Coupled Resonant Cavity Structure." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59026.

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Surface waves have been shown to play a key role in spontaneous thermal emission in the near-field as well as the coherence and the polarization properties of the nonradiative field. The near-field coherence of the delocalized nonradiative surface waves can be transferred into radiative fields by introducing a shallow grating on the surface. We show that the coherency of the thermal radiation can be enhanced by an order of magnitude compared with the coherency imposed by the delocalized surface waves. The enhanced coherency is due to coherent coupling between resonant cavities obtained by surface standing waves, where each cavity supports localized field that is attributed to coupled surface waves. We realized coupled resonant cavity structure on amorphous SiO2 and crystalline SiC, both support surface phonon-polaritons, to demonstrate extraordinary coherent thermal emission with a high quality factor of 600 and a spatial coherence length of 760λ.
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Zhang, Jun, Bin Rao, and Zhongping Chen. "Coherent amplified optical coherence tomography." In European Conference on Biomedical Optics. Washington, D.C.: OSA, 2007. http://dx.doi.org/10.1364/ecbo.2007.6627_36.

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Zhang, Jun, Bin Rao, and Zhongping Chen. "Coherent amplified optical coherence tomography." In European Conference on Biomedical Optics, edited by Peter E. Andersen and Zhongping Chen. SPIE, 2007. http://dx.doi.org/10.1117/12.728654.

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Gbur, Greg, and Taco D. Visser. "Coherence vortices in partially coherent beams." In Frontiers in Optics. Washington, D.C.: OSA, 2003. http://dx.doi.org/10.1364/fio.2003.thb5.

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Pishdad, Leila, Federico Fancellu, Ran Zhang, and Afsaneh Fazly. "How coherent are neural models of coherence?" In Proceedings of the 28th International Conference on Computational Linguistics. Stroudsburg, PA, USA: International Committee on Computational Linguistics, 2020. http://dx.doi.org/10.18653/v1/2020.coling-main.539.

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Pishdad, Leila, Federico Fancellu, Ran Zhang, and Afsaneh Fazly. "How coherent are neural models of coherence?" In Proceedings of the 28th International Conference on Computational Linguistics. Stroudsburg, PA, USA: International Committee on Computational Linguistics, 2020. http://dx.doi.org/10.18653/v1/2020.coling-main.539.

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Teramura, Y., K. Suzuki, M. Suzuki, and F. Kannari. "Low coherence interferometry using coherent function synthesis." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cfd5.

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Low coherence interferometry (LCI) is a noninvasive sensing method that provides depth information with high resolution and high sensitivity When the coherence of broadband incoherent light is modified by the same spectral modulation technique utilized in femtosecond pulse shaping1, one can achieve more functional sensing. In this paper, coherent function synthesis by manipulating the spectral phase of low coherence light in the frequency domain and its application in a reflectometry are described.
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Izatt, Joseph A., Michael R. Hee, Gary Tearney, Gabrielle M. Owen, Eric Swanson, and James G. Fujimoto. "Optical Coherence Microscopy." In Advances in Optical Imaging and Photon Migration. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/aoipm.1994.ci.249.

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Confocal microscopy has become a standard technique for high resolution optical imaging in many fields1,2. Confocal imaging is conventionally limited to relatively transparent specimens, since image contrast is degraded by light scattering in turbid samples. We have developed a new method for coherent confocal microsopy which uses low-coherence interferometry to enhance optical sectioning in highly scattering media. In optical coherence microscopy (OCM), improved confocal imaging is achieved through high detection sensitivity and high contrast rejection of out-of-focus light. OCM is an adaptation of optical coherence tomography (OCT), which has recently been demonstrated for noninvasive, ten-micron-scale resolution imaging in the eye and other biological tissues3-5. The extension of this technique to confocal microscopy offers the potential for micron-resolution imaging deep into highly scattering media such as skin and endoscopically accessible tissues, and may make possible the development of a new form of noninvasive "optical biopsy."
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Kong, Honqzhi, Cunkai Wu, and Mark Cronin-Golomb. "Effects of spatial coherence on photorefractive two-beam coupling." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.fs3.

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Photorefractive two-beam coupling with partially coherent light is investigated both theoretically and experimentally. By applying partial-coherence theory, a spatially varying distribution function for the grating visibility is found analytically. For certain beam configurations, this function may be approximated as one-dimensional and the coupled wave equations may be established and solved numerically. When compared to the case of perfect coherence, partial coherence has two major effects on the beam coupling. One is that the effective grating length may be smaller than the crystal length as a result of the spatial-coherence limit. The second is that the visibility distribution over the grating is smaller than the constant visibility of the coherent case.
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Reports on the topic "Coherence"

1

Bickel, Douglas Lloyd. SAR image effects on coherence and coherence estimation. Office of Scientific and Technical Information (OSTI), January 2014. http://dx.doi.org/10.2172/1147517.

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Hodgkiss, William S. Coherence of Transients. Fort Belvoir, VA: Defense Technical Information Center, June 1992. http://dx.doi.org/10.21236/ada253926.

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Williams, Craig, Jr Reynolds, de Supinski Paul F., and Bronis R. Delta Coherence Protocols. Fort Belvoir, VA: Defense Technical Information Center, January 2000. http://dx.doi.org/10.21236/ada480167.

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Kamenev, Alex, and Leonid Glazman. Electron Coherence in Mesoscopic Structures. Office of Scientific and Technical Information (OSTI), March 2011. http://dx.doi.org/10.2172/1009434.

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Ocko, Samuel. Coherence Properties of the LCLS. Office of Scientific and Technical Information (OSTI), August 2010. http://dx.doi.org/10.2172/992935.

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Wolf, Emil. Spatial - Coherence Effects in Spectroscopy. Fort Belvoir, VA: Defense Technical Information Center, December 2002. http://dx.doi.org/10.21236/ada408980.

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Flatte, Michael E. Spin Coherence in Semiconductor Nanostructures. Fort Belvoir, VA: Defense Technical Information Center, December 2006. http://dx.doi.org/10.21236/ada459443.

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Touzi, R., A. Lopes, J. Bruniquel, and P. W. Vachon. Coherence Estimation for SAR Imagery. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1999. http://dx.doi.org/10.4095/219098.

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Lindesay, James. Quantum Coherence Arguments for Cosmological Scale. Office of Scientific and Technical Information (OSTI), May 2005. http://dx.doi.org/10.2172/890780.

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Chang, Chang. Coherence techniques at extreme ultraviolet wavelengths. Office of Scientific and Technical Information (OSTI), January 2002. http://dx.doi.org/10.2172/810486.

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