To see the other types of publications on this topic, follow the link: Differential measurement.
Dissertations / Theses on the topic 'Differential measurement'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Differential measurement.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Gander, Matthew James. "Multicore optical fibre sensors for differential strain measurement." Thesis, Heriot-Watt University, 2000. http://hdl.handle.net/10399/513.
Full text
2
Justo, Hernandez Ruiz. "Low differential pressure and multiphase flow measurements by means of differential pressure devices." Diss., Texas A&M University, 2004. http://hdl.handle.net/1969.1/1077.
Full textAbstract:
The response of slotted plate, Venturi meter and standard orifice to the presence of two phase, three phase and low differential flows was investigated. Two mixtures (air-water and air-oil) were used in the two-phase analysis while a mixture of air, water and oil was employed in the three-phase case. Due to the high gas void fraction (α>0.9), the mixture was considered wet gas. A slotted plate was utilized in the low differential pressure analysis and the discharge coefficient behavior was analyzed. Assuming homogeneous flow, an equation with two unknowns was obtained for the multi-phase flow analysis. An empirical relation and the differential response of the meters were used to estimate the variables involved in the equation. Good performance in the gas mass flow rate estimation was exhibited by the slotted and standard plates for the air-water flow, while poor results were obtained for the air-oil and air-water oil flows. The performance of all the flow meter tested in the analysis improved for differential pressures greater than 24.9 kPa (100 in_H2O). Due to the tendency to a zero value for the liquid flow, the error of the estimation reached values of more than 500% at high qualities and low differential pressures. Air-oil and air-water-oil flows show that liquid viscosity influences the response of the differential pressure meters. The best results for high liquid viscosity were obtained in the Venturi meter using the recovery pressure for the gas flow estimation at differential pressures greater than 24.9 kPa (100 in_H2O). A constant coefficient Cd was used for the low differential pressure analysis and results did show that for differential pressure less than 1.24 kPa (5 inH2O) density changes are less than 1% making possible the incompressible flow assumption. The average of the computed coefficients is the value of Cd.
3
Ji, Jie. "Investigation of Skew on Differential High Speed Links." Thesis, University of Gävle, Department of Technology and Built Environment, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-722.
Full textAbstract:
Skew in telecommunication normally means the difference in arrival time of bits transmitted at the same time in differential transmission. As an increasing of transmission data bit rate and more importantly, a data and clock signal rise time of become faster, digital system interconnects became behaving as transmission line. The high speed signals become microwave in nature. The problem is that modern digital designs and verifications require knowledge that has formerly not been needed for a data bit rate of below than 100Mbit but also at the higher frequency range as 5 to 15GHz, however, most references on the necessary subjects are too abstract to be immediately applicable to the skew. For this reason a new method to investigate the skew were introduced, and with which, test board were measured. Since the test boards are made in devise material, and lines on the boards are configured out in distinct structures. In this paper, several methods were applied to find out the skew, and by comparing the results, it could be found that how factors affect the skew, not only the material factor, but some manufactory reason.
4
Uemura, Sho. "Differential cross section measurement for the d(n,np) reaction." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/61004.
Full textAbstract:
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2010.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (p. 83-84).
The differential cross section for the quasielastic d(n,np) neutron-induced deuteron breakup reaction was measured as a function of incident and scattered particle energies and angles, using a liquid deuterium target at the Weapons Neutron Research (WNR) spallation neutron beam at the Los Alamos Neutron Science Center at the Los Alamos National Laboratory. Cross sections were computed for the incident neutron energy ranges of 10010, 20010, and 30010 MeV. We used proton detectors covering a range of = 17 - 25 in the lab frame, and neutron detectors covering a range of = 55 - 76 in the lab frame. Experiment setup and data analysis are discussed, and preliminary results are presented for the cross section.
by Sho Uemura.
S.B.
5
Radhakrishnan, Sudhaharini. "Measurement of Thermal Properties of Seafood." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36834.
Full textAbstract:
Thermal properties of ten different seafood were measured in this research. They included bluefish (Pomatomus saltatrix), croaker (Micropogonias undulatus), spanish mackerel (Scomberomorus maculatus), pink salmon (Oncorhynhus gorbuscha), black seabass (Atractoscion nobilis), spot (Leiostomus xanthurus), shrimp(Pandalus borealis), tilapia (Tilapia aurea), grey sea trout(Cynoscion regalis), and yellow fin tuna (Thunnus albacares) (Wheaton, et al. 1985). Thermal properties measured were thermal conductivity, thermal diffusivity, and specific heat from 5 to 30oC. Enthalpy was measured from -40 to 30oC. Moisture and fat content were measured. Thermal conductivity and thermal diffusivity were measured by a rapid transient technique using a bead thermistor probe. Specific heat and enthalpy were measured using a differential scanning calorimeter. Moisture content and fat content were measured by the AOAC specified oven dry method and ether extraction method, respectively.
The measured thermal properties agreed well with the scarcely available literature values. They were then statistically correlated with moisture and fat content. Based on statistical analysis, mathematical models relating thermal properties and composition were proposed and compared with the models available in the literature. Models for thermal conductivity and specific heat were recommended to predict these properties of meats and fish with similar composition.Master of Science
6
Brink, Anita. "Renogram Image Characteristics and the Reproducibility of Differential Renal Function Measurement." Doctoral thesis, Faculty of Health Sciences, 2019. https://hdl.handle.net/11427/31657.
Full textAbstract:
Aim
The reproducibility of differential renal function (DRF) estimates on 99mTc-mercaptoacetyltriglycine (99m Tc-MAG3) is good in the majority of children. There is however a small but important group with poor reproducibility which, if not recognized, could affect clinical decision making. Some factors, such as age and glomerular filtration rate (GFR), have been implicated as causes for poor reproducibility. The aim of this study is to formally investigate image characteristics associated with the reproducibility of DRF measurements.
Patients and methods
The image characteristics and reproducibility of the DRF estimates of the 127 patients in cohort 1 was used to identify the characteristics associated with reproducibility. The associations between these image characteristics and reproducibility were then tested in a second cohort of 227 patients. The DRF measurements were calculated using two internationally accepted methods for calculating DRF, the HERMES area under the curve (HAUC) method and the HERMES Rutland Patlak (HRP) method. The images were visually inspected to categorise the categorical variables and processed to obtain the values of the continuous variables. The variables investigated included two nonimaging variables, age (in months) and GFR which included measured or estimated GFR values. The association between each variable and the reproducibility of DRF measurement for both the HAUC and the HRP methods was tested with univariate linear regression. The results of the univariate linear regression were used to plan the multiple linear regression combinations. All possible combinations were tested with multiple linear regression.
Results
The goodness-to-fit for the multiple regression models were much higher for all the combinations analysed in cohort 1 than in cohort 2. In cohort 1 the R2 -values ranged from 0.3510 to 0.4906 for log MAXMINHAUC and 0.3284 to 0.4500 for log MAXMINHRP. In cohort 2, they ranged from 0.1675 to 0.2163 for log MAXMINHAUC, and 0.1706 to 0.2191 for log MAXMINHRP. The combinations with the highest R2 -value for multiple linear regression analyses were similar in cohort 1 and 2. The only individual variable which was significant in all the multiple linear regression combinations for cohort 1 and 2 for both log MAXMINHAUC and log MAXMINHRP was LEFT KIDNEY TO BACKGROUND RATIO. RIGHT KIDNEY TO BACKGROUND RATIO, RIGHT RENAL MARGINS WELL DEFINED, RIGHT RENAL MARGINS POORLY VISUALISED and TIME VISUALISATION RIGHT CALYCES were significant in most of the combinations analysed. A high kidney to background ratio, RIGHT RENAL MARGINS WELL DEFINED and higher AGE predicted a good reproducibility. A low kidney to background ratio and later TIME VISUALISATION RIGHT CALYCES predicted poor reproducibility. The variables LEFT RENAL AREA, LEFT BACKGROUND AREA, BOTH RENAL MARGINS SMOOTH and RIGHT RENAL MARGINS IRREGULAR were not-significant in any combinations analysed cohort 1 and 2 for both log MAXMINHAUC and log MAXMINHRP. The remaining variables inconsistently predicted reproducibility in log MAXMINHAUC and log MAXMINHRP for both cohort 1 and 2.
Conclusion:
The only variables which consistently predicted good and poor reproducibility for the measurement of DRF on 99mTc-MAG3 renograms performed according to the EANM guidelines for both log MAXMINHAUC and log MAXMINHRP were AGE, LEFT KIDNEY TO BACKGROUND RATIO, RIGHT KIDNEY TO BACKGROUND RATIO, RIGHT RENAL MARGINS WELL DEFINED and TIME VISUALISATION RIGHT CALYCES. Consideration should be given to incorporating the kidney to background ratio into the renal processing screen display as a valuable quality control step. The DRF values should be interpreted with caution if the kidney to background ratio is < 2.0.
7
Kyei-Blankson, Lydia S. "Predictive Validity, Differential Validity, and Differential Prediction of the Subtests of the Medical College Admission Test." Ohio University / OhioLINK, 2005. http://www.ohiolink.edu/etd/view.cgi?ohiou1125524238.
Full text
8
IMANI, BEHZAD. "ESTIMATION OF WATER CONTENT, TRANSPIRATION RATE, AND WATER POTENTIAL OF COTTON FROM STEM DIAMETER MEASUREMENTS USING A LINEAR VOLTAGE DIFFERENTIAL TRANSFORMER." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184005.
Full textAbstract:
The Linear Voltage Differential Transformer (LVDT) is an accurate sensor for stem diameter measurements. Based on the results of this dissertation it was found that stem diameter [mm] was related to water content [grams] of the cotton crop by the following equation: W(D) = 0.114(D)³ˑ¹⁸² Also the ratio of stem diameter contraction rate to the rate of water loss in cotton was experimentally determined to be: (dW/dt)/(dD/dt) = (0.166 [g min⁻¹])/(0.535 [μm min⁻¹]) = (.0469% per minute)/(.0039% per minute). Similarly the cellular water potential was derived to be a non linear function of stem diameter in cotton: ψ(t) - ψₒ = 2 ε ln (D(t)/ Dₒ) + πₒDₒ² [(1/D²(t)) – (1/Dₒ²)]. Based on this work, the grower can estimate the water content, transpiration rate and water potential of the cotton crops via stem diameter measurements. Moreover, a computer system can be implemented to remotely keep track of the water status of the field, and control the irrigation system. A general model was proposed to quantify the nature of input-output relation of the cotton crop. A proposed simplified model based on stem diameter is also introduced. The stem diameter measurements can be used as an index for estimation of cotton's water content, transpiration rate, and water potential. These three parameters and the proposed simplified model established a plant based predictive irrigation scheduling technique. The electrical output of the LVDT was quite noisy. To remove the noise and demodulate the data, two cascade circuits were designed and implemented. First, the external output circuit removed the noise and isolated the LVDT. Second, the LVDT signal conditioner demodulated the phase information from the secondary windings which were produced by the movement of the rod. By the implementation of these circuits, 1 m of the rod displacement resulted in 1.14 mv of dc voltage changes in the output.
9
Lawrence, James. "Differential absorption LiDAR for the total column measurement of atmospheric CO2 from space." Thesis, University of Leicester, 2012. http://hdl.handle.net/2381/10379.
Full textAbstract:
Since the beginning of the industrial revolution (1750 to 1800) the Earth’s atmospheric composition has undergone significant change as a result of human activities, in particular the burning of fossil fuels. As a consequence the atmospheric concentrations of a number of gases known to be influential to the Earth’s climate have increased far beyond natural levels. Atmospheric gases such as carbon dioxide which naturally exist in the Earth system have increased in correlation with anthropogenic emissions. The effect of this perturbation on the Earth system has been predicted through computer simulations to have undesirable consequences on the Earth’s future climate. The present measurement systems for atmospheric carbon dioxide have limited spatial coverage and temporal resolution which restricts their ability to accurately attribute observations of atmospheric composition to particular terrestrial sources and sinks. This inability to accurately locate and quantify the key carbon dioxide sources and sinks in the terrestrial and marine biospheres is hindering the understanding of the processes that are driving the Earth’s natural uptake of approximately half of the anthropogenic carbon dioxide emissions. With such uncertainty it is currently unknown precisely how the Earth’s climate will respond to global warming in the future. Through computer simulation it has been demonstrated that improving the spatial distribution of global measurements of atmospheric carbon dioxide is likely to advance the present understanding of the Earth’s terrestrial sources and sinks. Regions that require particular improvement in measurement coverage are the southern oceans owing to a lack of landmass on which to site instruments, and much of the tropics because of difficulties in locating instruments in some of the worlds more politically unstable regions. Satellite remote sensing instruments which measure atmospheric carbon dioxide from low Earth orbit provide some coverage of these sparsely sampled locations, however cloud cover often prevents measurements being made (particularly in the tropics), and limited latitudinal coverage caused by current instruments using passive remote sensing techniques prevents measurements at very high and low latitudes (including much of the southern ocean during local winter). An alternative remote sensing technique has been proposed in the scientific literature for measuring atmospheric carbon dioxide concentrations using laser emissions from a satellite platform known as total column differential absorption LiDAR (TC-DIAL). The TC-DIAL technique has been identified as having the theoretical potential to meet the coverage and precision requirements to greatly aid in identifying and quantifying terrestrial carbon dioxide sources and sinks. The TC-DIAL technique has the potential to achieve these goals largely owing to its unique capabilities of being able to make measurements during both the day and night and at all latitudes with a footprint which may be small enough to see between patchy cloud cover in the tropics. This thesis builds on previous studies of the TC-DIAL measurement technique from a satellite platform to assess its current and future capabilities to meet the observation requirements defined by the atmospheric carbon and modeling scientific communities. Particular investigations are carried out to assess the optimum system configuration in the context of global carbon modeling using up-to-date spectroscopy and instrument parameters for the latest technology. Optimum systems for both direct and heterodyne detection TC-DIAL instruments are defined, and it is found that direct detection provides the lowest retrieval errors under clear sky conditions. For a system based on current technology TC-DIAL retrievals are expected to have errors of approximately 0.68 ppm for direct detection and 1.01 ppm for heterodyne detection over a 50 km surface track. Using global cloud statistics two suitable pulse repetition frequencies (PRF) for a heterodyne detection system have been identified as 5 and 15 kHz. These PRF’s provide the minimum probability of an effect known as cross signal contamination occurring when measurements are made in the presence of cloud. In this thesis it is shown that the retrieval error incurred by cross signal contamination is > 16 ppm for a heterodyne detection TC-DIAL system measuring through cloud with optical depth > 2. The most important retrieval error component in TC-DIAL retrievals has been found to be the uncertainties introduced by the use of numerical weather prediction data for the ancillary atmospheric profiles. The limited spatial resolution of current NWP models (> 20 km) implies the uncertainties associated with the ancillary data are required to be treated as systematic, and as a consequence their errors dominate over other TC-DIAL retrieval errors following multiple pulse integration.
10
Holzhausen, Rudolf. "A clinical patient vital signs parameter measurement, processing and predictive algorithm using ECG." Thesis, Brunel University, 2011. http://bura.brunel.ac.uk/handle/2438/6466.
Full textAbstract:
In the modern clinical and healthcare setting, the electronic collection and analysis of patient related vital signs and parameters are a fundamental part of the relevant treatment plan and positive patient response. Modern analytical techniques combined with readily available computer software today allow for the near real time analysis of digitally acquired measurements. In the clinical context, this can directly relate to patient survival rates and treatment success. The processing of clinical parameters, especially the Electrocardiogram (ECG) in the critical care setting has changed little in recent years and the analytical processes have mostly been managed by highly trained and experienced cardiac specialists. Warning, detection and measurement techniques are focused on the post processing of events relying heavily on averaging and analogue filtering to accurately capture waveform morphologies and deviations. This Ph. D. research investigates an alternative and the possibility to analyse, in the digital domain, bio signals with a focus on the ECG to determine if the feasibility of bit by bit or near real time analysis is indeed possible but more so if the data captured has any significance in the analysis and presentation of the wave patterns in a patient monitoring environment. The research and experiments have shown the potential for the development of logical models that address both the detection and short term predication of possible follow-on events with a focus on Myocardial Ischemic (MI) and Infraction based deviations. The research has shown that real time waveform processing compared to traditional graph based analysis, is both accurate and has the potential to be of benefit to the clinician by detecting deviations and morphologies in a real time domain. This is a significant step forward and has the potential to embed years of clinical experience into the measurement processes of clinical devices, in real terms. Also, providing expert analytical and identification input electronically at the patient bedside. The global human population is testing the healthcare systems and care capabilities with the shortage of clinical and healthcare providers in ever decreasing coverage of treatment that can be provided. The research is a moderate step in further realizing this and aiding the caregiver by providing true and relevant information and data, which assists in the clinical decision process and ultimately improving the required standard of patient care.
11
Xiang, Dong. "Differential dielectric sensor analysis and experimental investigation of a modular differential dielectric sensor for use in multiphase separation, process measurement and control." Saarbrücken VDM Verlag Dr. Müller, 2008. http://d-nb.info/991258150/04.
Full text
12
Mtsatse, Nangamso. "Exploring Differential Item Functioning on reading achievement between English and isiXhosa." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/65447.
Full textAbstract:
Post-Apartheid South Africa has undergone an educational language policy shift from only Afrikaans and English in education to the representation of all 11 official languages: Afrikaans, English, isiZulu, isiXhosa, isiNdebele, siSwati, Sesotho, Setswana, Tshivenda and Xitsonga. The national languages policy included the Language in Education Policy (LiEP), which stipulates that learners from grades 1- 3 in all ways possible should be provided the opportunity to be taught in their home language (HL). With this change, there has been a need to increase access to African languages in education. The 2007 Status of LoLT report released by the Department of Education (DoE) revealed that since 1996 up to 65% of learners in the foundation phase are being taught in their home language. In other ways, the LiEP has been successful in bridging the gap of access to African languages in the basic education system. With that said, there has been rapid growth of interest in early childhood crosscultural literacy assessment across the globe. Internationally South Africa has participated in the Southern and Eastern Africa Consortium for Monitoring Education Quality as well as the Progress in International Reading Literacy Study studies. The design of these particular international studies meant participation in the same assessment but in different languages, calling into question the equivalence of assessments across languages. Assessing across languages should aim to encourage linguistic equivalence, functioning equivalence, cultural equivalence as well as metric equivalence. South Africa has taken part in three cycles of the Progress in International Reading Literacy (PIRLS) study. The purposes of the current study is to present secondary analysis of the prePIRLS 2011 data, to investigate any differential item functioning (DIF) of the achievement scores between English and isiXhosa. The Organisation for Economic Co-operation and Development (OECD) developed a framework of input, process and output for curriculum process. The framework shows the multiple facets that needs to be considered when implementing a curriculum in a country. The curriculum process framework was used as the theoretical framework for this study. The framework views curriculum success as a process of measuring how the intended curriculum (input) was implemented (process) and should be reflected in the attained curriculum (output). The adapted framework is LiEP as the attained curriculum, as learners in the prePIRLS 2011 are tested in the LoLT in Grades 1-3. Followed by the prePIRLS 2011 assessment, as the implemented curriculum testing the learners’ comprehension skills requires by grade 4 in their HL. Lastly, the attained curriculum refers the learners’ achievement scores in the prePIRLS 2011 study. A sample of 819 Grade 4 learners (539 English L1 speaking learners and 279 isiXhosa L1 speakign learners) that participated in the prePIRLS 2011 study were included in this study. These learners wrote a literary passage called The Lonely Giraffe, accompanied by 15 items. The study made use of the Rasch model to investigate any evidence of Differential Item Functioning (DIF) on the reading achievement of the learners. The findings showed that the items did not reflect an equal distribution. In addition, an item by item DIF analysis revealed discrimination on one subgroup over the other. A further investigation showed that these discriminations could be explained by means of inaccurate linguistic equivalence. The linguistic equivalence could be explained by means of mistranslation and/or dialectal differences. Subsequently, the complexities of dialects in African languages are presented by providing isiXhosa alternative translations to the items. The significance of the current study is in its potential contribution in further understanding language complexities in large-scale assessments. Additionally, in attempts to provide valid, reliable and fair assessment data across sub-groups.Dissertation (MEd)--University of Pretoria, 2017.
Science, Mathematics and Technology Education
Centre for Evaluation & Assessment (CEA)
MEd
Unrestricted
13
Liu, Qiaoling. "Ultrafine particle generation and measurement." VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/3971.
Full textAbstract:
Ultrafine particles (UFPs) with diameters smaller than 100 nm are omnipresent in ambient air. They are important sources for fine particles produced through the agglomeration and/or vapor condensation. With their unique properties, UFPs have also been manufactured for industrial applications. But, from the toxicological and health perspective, ultrafine particles with high surface-to-volume ratios often have high bio-availability and toxicity. Many recent epidemiologic studies have evidence UFPs are highly relevant to human health and disease. In order to better investigate UFPs, better instrumentation and measurement techniques for UFPs are thus in need. The overall objective of this dissertation is to advance out current knowledge on UFPs generation and measurement. Accordingly, it has two major parts: (1) ultrafine particle generation for laboratory aerosol research via electrospray (ES), and (2) ultrafine particle measurement for ambient aerosol monitor and personal exposure study via the development of a cost-effective and compact electrical mobility particle sizer. In the first part, to provide monodisperse nanoparticles, a new single capillary electrospray with a soft X-ray photoionizer as a charge reduction scheme has been developed. The soft X-ray effects on electrospray operation, particle size distribution and particle charge reduction were evaluated. To generate ultrafine particles with sufficient mass concentration for exposure/toxicity study, a TSE twin-head electrospray (THES) was evaluated, as well. The configuration and operational variables of the studied THES has been optimized. Three different nanoparticle suspensions were sprayed to investigate material difference. In the second part, to develop a miniature electrical mobility based ultrafine particle sizer (mini e-UPS), a new mini-plate aerosol charger and a new mini-plate differential mobility analyzer (DMA) have been developed. The performances of mini-plate charger and mini-plate DMA were carefully evaluated for ultrafine particles, including intrinsic/extrinsic charging, extrinsic charge distribution, DMA sizing accuracy and DMA transfer function. A prototype mini e-UPS was then assembled and tested by laboratory generated aerosol. Also a constrained least square method was applied to recover the particle size distribution from the current measured by a mini Faraday Cage aerosol electrometer.
14
Vural, Aydin. "Precise Height Estimation By Differential Amplitude Measurement For An Airborne Cw Doppler Proximity Sensor." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614956/index.pdf.
Full textAbstract:
Airborne CW doppler proximity sensors are very sensitive, but leaks precise height measurement. It may be possible to estimate the heigth at the terminal phase (the case where the sensor is at a heigth close to ground) precisely by using the doppler shift and amplitude information. The thesis includes this novel concept with theoritical analysis and simulation results.
15
Laming, J. M. "A differential measurement of the ground state Lamb shift in hydrogenic germanium Ge'3'1'+." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235051.
Full text
16
Fabbri, Federica. "Measurement of ttbar production differential cross section at \sqrt{s}=8 TeV at ATLAS." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7599/.
Full textAbstract:
Top quark studies play an important role in the physics program of the Large
Hadron Collider (LHC). The energy and luminosity reached allow the acquisition of
a large amount of data especially in kinematic regions never studied before. In this
thesis is presented the measurement of the ttbar production differential cross section
on data collected by ATLAS in 2012 in proton proton collisions at \sqrt{s} = 8 TeV,
corresponding to an integrated luminosity of 20.3 fb^{−1}. The measurement is performed for ttbar events in the semileptonic channel where the hadronically decaying
top quark has a transverse momentum above 300 GeV. The hadronic top quark
decay is reconstructed as a single large radius jet and identified using jet substructure properties. The final differential cross section result has been compared with
several theoretical distributions obtaining a discrepancy of about the 25% between
data and predictions, depending on the MC generator. Furthermore the kinematic
distributions of the ttbar production process are very sensitive to the choice of the
parton distribution function (PDF) set used in the simulations and could provide
constraints on gluons PDF. In particular in this thesis is performed a systematic
study on the PDF of the protons, varying several PDF sets and checking which one
better describes the experimental distributions. The boosted techniques
applied in
this measurement will be fundamental in the next data taking at \sqrt{s}=13 TeV when
will be produced a large amount of heavy particles with high momentum.
17
Foster, Garett C. "Measurement Invariance of Burnout Inventories across Sex." Bowling Green State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1428162452.
Full text
18
Bolz, Arthur Eugen [Verfasser], and André [Akademischer Betreuer] Schöning. "Measurement of Differential ρ0 Photoproduction Cross-Sections at HERA / Arthur Eugen Bolz ; Betreuer: André Schöning." Heidelberg : Universitätsbibliothek Heidelberg, 2019. http://d-nb.info/1201346479/34.
Full text
19
Olmstead, Michael Roy. "Development of a differential temperature probe for the measurement of atmospheric turbulence at all levels." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23172.
Full text
20
Bolz, Arthur [Verfasser], and André [Akademischer Betreuer] Schöning. "Measurement of Differential ρ0 Photoproduction Cross-Sections at HERA / Arthur Eugen Bolz ; Betreuer: André Schöning." Heidelberg : Universitätsbibliothek Heidelberg, 2019. http://d-nb.info/1201346479/34.
Full text
21
Mathur, Navin G. "Feasibility of using a low-cost inertial measurement unit with centimeter accuracy differential global positioning system." Ohio University / OhioLINK, 1999. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1181173720.
Full text
22
Prinsloo, David Schalk Van Der Merwe. "Characterisation of L-band differential low noise amplifiers." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/18063.
Full textAbstract:
Thesis (MScEng)--Stellenbosch University, 2011.ENGLISH ABSTRACT: This thesis addresses the complications that are encountered when characterising the performance of differential microwave LNAs. The predominant sources of noise in electronic circuits are introduced and equivalent two-port noise models for active devices are derived. Correlation between noise generators are defined by means of the noise correlation matrix and existing network theory is adapted to include noise analysis of twoport and multi-port networks. Mixed-mode scattering parameters are introduced in order to define the signal performance of differential and common-mode propagation in multi-port networks and, by applying the same theory, the mixed-mode correlation matrix for a three-port dLNA is derived. Furthermore, an expression is derived for de-embedding the differential noise figure of a three-port dLNA using two single ended measurements. Two dLNA designs, both incorporating wideband 180°-Hybrid ring couplers, are discussed and the differential signal and noise performance of the dLNAs are compared to that of their constituent single ended LNAs.
AFRIKAANSE OPSOMMING: Hierdie tesis behandel die komplikasies wat ontwerpers in die gesig staar tydens die karakterisering van mikrogolf differensiële laeruis versterkers. Die hoof ruisbronne in stroombane word bespreek en ekwivalente tweepoortnetwerkmodelle vir aktiewe toestelle word afgelei. Korrelasie tussen ruisbronne word gedefnieer deur middel van ruiskorrelasiematrikse en bestaande tweepoort- en multipoort-netwerkteorie word aangepas om ruismodelle in te sluit. Weens die feit dat differensiële- en gemene-wyse voortplanting van seine voorkom in multipoortnetwerke word gemengde-modus S-parameters behandel. Dieselfde teorie maak dit vervolgens moontlik om die gemengde-modus ruiskorrelasiematriks van ’n drie-poort differensiële laeruis versterker af te lei. Verder word daar ’n wyse voorgestel waarmee die differensiëleruissyfer van ’n drie-poort differensiële laeruis versterker vanuit twee enkel ruissyfermetings bereken kan word. Twee differensiële laeruis versterker ontwerpe, waarvan beide wyeband 180 -differensiaalkoppelaars implementeer, word bespreek en die differensiëlesein- asook die differensiëleruis-werking word vergelyk met die werking van die omsluite ongebalanseerde laeruis versterkers.
23
O'Loughlin, Christina. "Evaluation of measurement quality in the assessment of health related issues using structural equation modelling techniques." Thesis, University of Ulster, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342424.
Full text
24
Geller, Norman J. "Asperger's Syndrome and Non-verbal Learning Disabilities: A study of differential diagnosis agreement across disciplines." VCU Scholars Compass, 2005. http://scholarscompass.vcu.edu/etd/1373.
Full textAbstract:
Mental health professionals tend to have a clinical perspective that is dependent upon Diagnostic and Statistical Manual of Mental Disorders-IV-TR (DSM-IV) criteria for a differential diagnosis. School-based clinicians are bound by regulations governing special education placement established by Individuals with Disabilities Education Act (IDEA). While both sets of clinicians generate diagnostic recommendations for students, the guidelines and criteria are not of parallel descriptors. AS is only a diagnosis provided for in DSM-IV. Non-verbal learning disability (NVLD) and high functioning autism (HFA) are addressed in both DSM-IV and IDEA. The dilemma presented to clinicians is intertwining the terminology of both fields in order to provide a more concise and meaningful diagnosis for the students who are being served. Although school-based and mental-health clinicians provide services for students, the criteria employed may differ. Essentially, the descriptors that are applied to Asperger's Syndrome (AS) and NVLD are similar and may only differ in the criteria used by different discipline affiliations. Upon review of the literature, there seems to be some question about the different clinical perspectives and diagnosis that may emerge. The criteria used for disability identification is often based upon discipline affiliation. Bashe and Kirby (2000) suggest that psychiatrists may identify students with AS while an education-based organization might suggest a learning disability and yet, a speech and language pathologist might refer to the same set of characteristics as a semantic-pragmatic disorder or an audiologist would refer to a central auditory processing disorder. Furthermore, Bashe and Kirby felt that the "specialist" generally sees and identifies the facet of AS that pertains to their area of expertise. While identification is a critical component of planning intervention, service delivery of both AS and NVLD students are relegated to educators and the school-based program. Therefore, the terminology employed to identify a disability must be applicable to the school setting. The literature often refers to AS in a hyphenated context with HFA. Rather than there being a consistent diagnostic category of AS, AS is often joined with HFA as a means of describing symptoms that transcend characteristics of autism but still have similarities with students classified as having autism. There is also a considerable amount of literature that differentiates the two terms and refers to AS and HFA as two distinct disabilities. Furthermore, there is a great deal of conjecture regarding AS as a type of learning disability. This study will ascertain whether there is agreement between disciplines in diagnosis of AS and NVLD, whether or not there is consistency between and among disciplines regarding the importance of specific characteristics of the two disabilities, and the application of these characteristics when rendering a diagnosis and intervention recommendations. While the results of this study did not demonstrate an interaction between diagnosis and professional discipline affiliation, it did demonstrate that the rate of correct diagnosis for AS was significantly higher than that of NVLD and autism. An alternative conclusion is that AS is overly diagnosed and impacting the rate of correct diagnosis for NVLD and autism. While there was an association between the elements used for clinical diagnosis of both autism and AS, there was a demonstrable correlation of service delivery models for both NVLD and AS and a departure of similarities in service delivery between AS and autism. Implications of these results are discussed in greater detail.
25
Korte, Hubert. "The integration of Wide Area Network Differential Global Positioning Systems (WAN-DGPS) into yield mapping on the combine harvester." Thesis, University of Newcastle Upon Tyne, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285322.
Full text
26
Hinrichsen, Bjorn. "A measurement of the dijet mass differential cross section in proton-antiproton collisions at 1.8 TeV." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0006/NQ41174.pdf.
Full text
27
Oldeman, Rudolf Gerhard Christiaan. "Measurement of differential cross-sections and structure functions in neutrino and anti-neutrino scattering on lead." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2000. http://dare.uva.nl/document/56191.
Full textAbstract:
Proefschrift Universiteit van Amsterdam.Part of the research program of 'het Nationaal Instituut voor Kernfysica en Hoge-Energie Fysica (NIKHEF)' Met lit. opg. - Met samenvatting in het Nederlands.
28
Talts, Jaak. "Continuous non-invasive blood pressure measurement: comparative and methodological studies of the differential servo-oscillometric method /." Online version, 2004. http://dspace.utlib.ee/dspace/bitstream/10062/932/5/Talts.pdf.
Full text
29
Korol, Ievgen [Verfasser], and Olaf [Akademischer Betreuer] Behnke. "Measurement of Double Differential ttbar Production Cross Sections with the CMS Detector / Ievgen Korol. Betreuer: Olaf Behnke." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2016. http://d-nb.info/111103916X/34.
Full text
30
Wang, Qun. "Measurement of the differential cross section of Z boson production in association with jets at the LHC." Doctoral thesis, Universite Libre de Bruxelles, 2018. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/271719.
Full textAbstract:
This thesis presents the measurement of the differential cross section of Z boson pro-duction in association with jets (Z+jets) in proton-proton collision at the center-of-massenergy of 13 TeV. The data has been recorded with the CMS detector at the LHC duringthe year 2015, corresponding to an integrated luminosity of 2.19 fb −1 .A study of theCMS muon High Level Trigger (HLT) with the data collected in 2016 is also presented.The goal of analysis is to perform a first measurement at 13 TeV of the cross sections ofZ+jets as a function of the jet multiplicity, its dependence on the transverse momentumof the Z boson, the jet kinematic variables (transverse momentum and rapidity), thescalar sum of the jet momenta, and the balance in the transverse momentum betweenthe reconstructed jet recoil and the Z boson. The results are obtained by correctingthe detector effects, and are unfolded to particle level. The measurement are com-pared to four predictions using different approximations: at the leading-order (LO),next-to-leading-order (NLO) and next-to-next-to-leading order (NNLO) accuracy. Thefirst two calculations used M AD G RAPH 5_ A MC@NLO interfaced with PYTHIA 8 for theparton showering and hadronisation, one of which includes matrix elements (MEs) atLO, another includes one-loop corrections (NLO). The third is a fixed-order calculationwith NNLO accuracy for Z+1 jet using the N -jettiness subtraction scheme (N jetti ). Thefourth uses the GENEVA program with an NNLO calculation combined with higher-order resummation.A series of studies on the HLT double muon trigger are also included. Since 2015 theLHC reached higher luminosity, more events are produced inside the CMS detector persecond, which resulted in more challenges for the trigger system. The work presentedincludes the monitoring, validation and the calibration of the muon trigger paths since2016.Doctorat en Sciences
info:eu-repo/semantics/nonPublished
31
Korol, Ievgen Verfasser], and Olaf [Akademischer Betreuer] [Behnke. "Measurement of Double Differential ttbar Production Cross Sections with the CMS Detector / Ievgen Korol. Betreuer: Olaf Behnke." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2016. http://nbn-resolving.de/urn:nbn:de:gbv:18-79194.
Full text
32
Olofsdotter, Susanne. "Anxiety among Adolescents : Measurement, Clinical Characteristics, and Influences of Parenting and Genetics." Doctoral thesis, Uppsala universitet, Institutionen för neurovetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-323578.
Full textAbstract:
Anxiety is the most commonly reported mental health problem among adolescents. Still, many adolescents in need of treatment are not detected and the clinical characteristics and etiological pathways of adolescent anxiety are under-researched topics. This thesis examined the clinical utility of the Swedish versions of the Spence Children’s Anxiety Scale (SCAS) and the clinical characteristics of multiple anxiety disorders among psychiatrically referred adolescents, and the influence of parenting and oxytocin gene (OXT) variants on anxiety among adolescents in the general population. Studies employed cross-sectional and longitudinal designs and were based on questionnaire, interview, and genotype data. Support for the reliability and validity of both SCAS and SCAS-P was obtained. The overall ability to predict anxiety among referred adolescents ranged from fair to excellent for both scales. Among adolescents psychiatrically referred for any reason, the prevalence of any anxiety disorder was 46%. Homotypic comorbidity was observed in 43%, and heterotypic comorbidity in 91%. Early adolescent anxiety influenced homotypic anxiety in late adolescence independent of parental rejection and control. The mediating role of parenting was small with indirect effect sizes no larger than one-tenth the size of direct effects, irrespective of the informant on parenting behavior. Significant interaction effects with positive and negative parenting were observed for OXT variants rs4813625 and rs2770378 in relation to social anxiety. The nature of the interactions was in line with the differential susceptibility framework for rs4813625, whereas for rs2770378, results indicated a diathesis–stress type of interaction. The findings suggest that psychiatrically referred adolescents with anxiety disorders are best characterized as a highly complex patient group and call attention to the necessity of structured assessment. For this purpose, this thesis provides evidence for the clinical utility of the SCAS; routine utilization of this questionnaire can improve detection of adolescents in need of anxiety treatment. Findings of this theses further suggest that the influence of positive and negative parenting behaviors on anxiety may be of greater importance among some adolescents than others, depending on individual differences in sensitivity to parenting. The etiology of anxiety among adolescents may therefore involve differential susceptibility effects of the interplay between genes and parenting behaviors.
33
Kama, Sami. "Measurement Of (anti-)neutrino--nucleon Structure Functions In Chorus Experiment." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606367/index.pdf.
Full textAbstract:
In this work an analysis of the CHORUS
(anti-)neutrino-nucleon scattering data taken on lead--scintillator calorimeter
during the 1998 run is presented. The differential cross-sections are
measured in the range of $0.01le xle 0.7$, $0.05le y le 0.95$,
$10le E_nu le 200 GeV$ for both anti-neutrino and neutrino beam modes.
The anti-neutrino and neutrino--nucleon structure
functions Fone, Ftwo and Fthree is extracted by making 2, 3 and 6-parameter
fits to the measured differential cross-sections.
The comparisons of these results with
the earlier experiments, CDHSW and CCFR is given.
34
Braren, Früd [Verfasser]. "Measurement and Interpretation of Higgs Boson Differential Cross Sections in the Diphoton Decay Channel and Measurement of the Photon Identification Efficiency in the ATLAS Experiment / Früd Braren." Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2020. http://d-nb.info/1221084755/34.
Full text
35
Siddiqui, Abujawad Rafid. "A Vision and Differential Steering System for a Mobile Robot Platform." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3040.
Full textAbstract:
Context: Effective vision processing is an important study area for mobile robots which use vision to detect objects. The problem of detecting small sized coloured objects (e.g. Lego bricks) with no texture information can be solved using either colour or contours of the objects. The shape of such objects doesn‟t help much in detecting the objects due to the poor quality of the picture and small size of the object in the image. In such cases it is seen that the use of hybrid techniques can benefit the overall detection of objects, especially, combining keypoint based methods with the colour based techniques. Robotic motion also plays a vital role in the completion of autonomous tasks. Mobile robots have different configurations for locomotion. The most important system is differential steering because of its application in sensitive areas like military tanks and security robot platforms. The kinematic design of a robotic platform is usually based on the number of wheels and their movement. There can be several configurations of wheels designs, for example differential drives, car-like designs, omni-directional, and synchro drives. Differential drive systems use speed on individual channels to determine the combined speed and trajectory of the robot. Accurate movement of the robot is very important for correct completion of its activities. Objectives: A vision solution is developed that is capable of detecting small sized colour objects in the environment. This has also been compared with other shape detection techniques for performance evaluation. The effect of distance on detection is also investigated for the participating techniques. The precise motion of a four-wheel differential drive system is investigated. The target robot platform uses a differential drive steering system and the main focus of this study is accurate position and orientation control based upon sensor data. Methods: For object detection, a novel hybrid method „HistSURF‟ is proposed and is compared with other vision processing techniques. This method combines the results of colour histogram comparison and detection by the SURF algorithm. A solution for differential steering using a Gyro for the rotational speed measurement is compared with a solution using a speed model and control outputs without feedback (i.e. dead reckoning). Results: The results from the vision experiment rank the new proposed method highest among the other participating techniques. The distance experiment indicates that there is a direct and inverse relation between the distance and detected SURF features. It is also indicated by the results that distance affects the detection rate of the new proposed technique. In case of robot control, the differential drive solution using a speed model has less error rate than the one that uses a Gyro for angle measurement. It is also clear from the results that the greater the difference of speeds among the channels the less smooth is the angular movement. Conclusions: The results indicate that by combining a key-point based technique with colour segmentation, the false positive rate can be reduced and hence object recognition performance improves . It has also become clear that the improved accuracy of the proposed technique is limited to small distances and its performance decreases rapidly with increase in the distance to target objects. For robot control, the results indicate that a Gyro alone cannot improve the movement accuracy of the robotic system due to a variable drift exhibited by the Gyro while in rotation. However, a Gyro can be effective if used in combination with a magnetometer and some form of estimation mechanism like a Kalman filter. A Kalman filter can be used to correct the error in the Gyro by using the output from the magnetometer, resulting in a good estimate.Bakgrund: Effektiv vision behandling är ett viktigt studieområde för mobila robotar som använder vision att upptäcka föremål. Problemet upptäcka små och medelstora färgade föremål (t.ex. Lego tegelstenar) utan konsistens information kan lösas med färg eller konturer av föremålen. Formen på sådana föremål spelar ingen hjälpa mycket att upptäcka föremål på grund av den dåliga kvaliteten på bild och ringa storlek på objektet i bilden. I sådana fall är det sett att användningen av hybrid-teknik kan gynna den totala upptäckt av föremål, särskilt genom att kombinera keypoint metoder med färgen tekniker. Robotic motion spelar också en viktig roll i genomförandet av självständiga uppgifter. Mobila robotar har olika konfigurationer för transport. Det viktigaste är differentierad styrning på grund av dess tillämpning i känsliga områden som stridsvagnar och säkerhet plattformar robot. Den kinematiska utformningen av en robot plattform är vanligtvis baserad på antalet hjul och deras rörelser. Det kan finnas flera konfigurationer av hjul mönster, till exempel olika enheter, bil-liknande mönster, rundstrålande, och driver synkroniserad. Differential drivsystem använder fart om olika kanaler för att bestämma den kombinerade snabbhet och banan för roboten. Exakt förflyttning av roboten är mycket viktigt för korrekt ifyllande av sin verksamhet. Mål: En vision lösning har utvecklats som kan upptäcka små och medelstora färg objekt i miljön. Detta har också jämfört med andra tekniker form upptäcka för utvärdering av prestanda. Effekten av avstånd vid upptäckt är också undersökas för de deltagande tekniker. Den exakta rörelse av en fyrhjulsdriven olika drivsystem undersöks. Målet robot plattform använder en differentierad system driva styrning och i centrum för denna studie är korrekt läge och riktning kontroll baserat på sensordata. Metoder: För att upptäcka, en ny hybrid metod "HistSURF" föreslås och jämförs med andra tekniker vision bearbetning. Denna metod kombinerar resultaten av färg histogram jämförelse och upptäckt av SURF algoritm. En lösning för differentierad styrning med hjälp av en Gyro för varvtal mätningen jämförs med en lösning med en hastighet modell och utgångar kontroll utan återkoppling (dvs död räkning). Resultat: Resultaten från den vision experiment inom den nya föreslagna metoden högsta bland de andra deltagande tekniker. Avståndet experiment indikerar att det finns ett direkt och omvänd korrelation mellan avstånd och upptäckt SURF funktioner. Det är också framgå av resultatet från det avståndet påverkar upptäckten hastighet av den nya föreslagna tekniken. Vid robot kontroll har skillnaden köra lösningen med en hastighet modell mindre felfrekvens än den som använder en Gyro för vinkelmätning. Det framgår även av resultaten att ju större skillnaden i hastigheter mellan de kanaler de mindre smidiga är vinkelrörelse. Slutsatser: Resultaten visar att genom att kombinera en central-punkt baserad teknik med färg segmentering, den falska positiva kan sänkas och därmed objektigenkänning prestanda ökar. Det har också blivit uppenbart att förbättrad noggrannhet av den föreslagna tekniken är begränsad till små avstånd och dess prestanda minskar snabbt med ökat avstånd till målet objekt. För robot kontroll, tyder resultaten på att en Gyro inte ensam kan förbättra rörligheten noggrannhet robotsystem på grund av en variabel glida ut av Gyro medan rotation. Men en Gyro kan vara effektiva om de används i kombination med en magnetometer och någon form av uppskattning mekanism som ett Kalman filter. En Kalman filter kan användas för att rätta till felet i Gyro med hjälp av utdata från magnetometer, vilket resulterar i en god uppskattning.
36
Arnison, Matthew Raphael. "Phase control and measurement in digital microscopy." University of Sydney. Physics, 2003. http://hdl.handle.net/2123/569.
Full textAbstract:
The ongoing merger of the digital and optical components of the modern microscope is creating opportunities for new measurement techniques, along with new challenges for optical modelling. This thesis investigates several such opportunities and challenges which are particularly relevant to biomedical imaging. Fourier optics is used throughout the thesis as the underlying conceptual model, with a particular emphasis on three--dimensional Fourier optics. A new challenge for optical modelling provided by digital microscopy is the relaxation of traditional symmetry constraints on optical design. An extension of optical transfer function theory to deal with arbitrary lens pupil functions is presented in this thesis. This is used to chart the 3D vectorial structure of the spatial frequency spectrum of the intensity in the focal region of a high aperture lens when illuminated by linearly polarised beam. Wavefront coding has been used successfully in paraxial imaging systems to extend the depth of field. This is achieved by controlling the pupil phase with a cubic phase mask, and thereby balancing optical behaviour with digital processing. In this thesis I present a high aperture vectorial model for focusing with a cubic phase mask, and compare it with results calculated using the paraxial approximation. The effect of a refractive index change is also explored. High aperture measurements of the point spread function are reported, along with experimental confirmation of high aperture extended depth of field imaging of a biological specimen. Differential interference contrast is a popular method for imaging phase changes in otherwise transparent biological specimens. In this thesis I report on a new isotropic algorithm for retrieving the phase from differential interference contrast images of the phase gradient, using phase shifting, two directions of shear, and non--iterative Fourier phase integration incorporating a modified spiral phase transform. This method does not assume that the specimen has a constant amplitude. A simulation is presented which demonstrates good agreement between the retrieved phase and the phase of the simulated object, with excellent immunity to imaging noise.
37
Pedroza, Albert. "IMPLEMENTATION OF DGPS AS A FLIGHT TEST PERFORMANCE MEASUREMENT TOOL." International Foundation for Telemetering, 1997. http://hdl.handle.net/10150/609790.
Full textAbstract:
International Telemetering Conference Proceedings / October 27-30, 1997 / Riviera Hotel and Convention Center, Las Vegas, NevadaThe accurate determination of test aircraft position and velocity is a very strong requirement in several certification and development flight test applications. This requirement often requires availability of test ranges properly instrumented with optical or radar tracking systems, precision time for data reduction and dependency on environmental and meteorological conditions. The capabilities of GPS (Global Positioning System) technology, in terms of data accuracy, speed of data availability and reduction of test operating cost, moved Bombardier Flight Test Center to make an investment and integrate a system utilizing GPS for extensive use in flight and ground test activity. Through the use of differential GPS (DGPS) procedures, Bombardier Flight Test Center was able to implement a complete system which could provide real-time data results to a very acceptable output rate and accuracy. Furthermore, the system was capable of providing post-processed data results which greatly exceeded required output rate and accuracy. Regardless of the type of aircraft testing conducted, the real-time or post-processed data could be generated for the same test. After conducting various types of testing, Bombardier Flight Test Center has accepted the DGPS as an acceptable and proper flight and ground test measurement tool for its various aircraft test platforms.
38
Spannagel, Simon [Verfasser], and Erika [Akademischer Betreuer] Garutti. "Test Beam Measurements for the Upgrade of the CMS Pixel Detector and Measurement of the Top Quark Mass from Differential Cross Sections / Simon Spannagel. Betreuer: Erika Garutti." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2016. http://d-nb.info/1103233351/34.
Full text
39
Ocalan, Kadir. "Measurement Of Differential Photon-jet Cross Section From 7 Tev Pp Collisions In The Cms Experiment At The Lhc." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614239/index.pdf.
Full textAbstract:
Prompt photons are produced primarily by quark-gluon compton scattering and quark-anti-quark annihilation mechanisms that their measurements are driven by several motivations at hadron colliders. Measurement of prompt photons can be used for probing perturbative Quantum Chromodynamics (pQCD). Prompt photons are produced in the final states of important decays providing evidence for low mass Higgs boson and new physics searches. Compact Muon Solenoid (CMS) is one of the multi-purpose experiments conducted at the Large Hadron Collider (LHC) to study the Standard Model (SM) physics including prompt photons
and new theories in proton-proton collisions. In this thesis, photon reconstruction is discussed along with the photon identification methods in the CMS experiment. Photon efficiency measurements are presented as an important ingredient for photon+jet cross section measurement.
Photon High Level Trigger (HLT) efficiencies, reconstruction (RECO) efficiencies, and identification (ID) efficiencies are presented that are measured from collision data recorded by the CMS detector and Monte Carlo simulation data. Efficiency corrected differential photon+jet cross section measurement results are presented in this study. The collision data used in this thesis corresponds to 2.2 /fb integrated luminosity collected by the CMS detector at a center-of-mass energy of 7 TeV from 2011 LHC proton-proton collision running.
40
Handley, Julia-Claire. "An investigation of the use of differential skin temperature measurement to determine an optimal thermal environment for preterm infants." Thesis, Staffordshire University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314867.
Full text
41
Bessner, Martin Florian [Verfasser], and Peter [Akademischer Betreuer] Schleper. "Measurement of differential di-photon plus jet cross sections using the ATLAS detector / Martin Florian Bessner ; Betreuer: Peter Schleper." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2017. http://d-nb.info/1139844172/34.
Full text
42
Leigh, Roland. "A concurrent multi-axis differential optical absorption spectroscopy system for the measurement of nitrogen dioxide and other trace species." Thesis, University of Leicester, 2006. http://hdl.handle.net/2381/30583.
Full textAbstract:
Despite improvements in efficiency in many combustion processes including vehicular engines, the level of nitrogen dioxide in the typical urban environment continues to impact a human health and requires regular monitoring. This thesis describes the development of a novel remote-sensing instrument configured for the measurement of nitrogen dioxide and other trace species in an urban environment.;A novel concurrent multi-axis differential optical absorption spectroscopy(CMAX-DOAS) system has been developed in this work based on scattered light spectroscopy. Data from the measurements has a temporal resolution of a minute or less and therefore the capability to spatially resolve different air masses as they traverse the instrument input optics. Such sampling capabilities are unique to a ground-based scattered-light DOAS system and are well suited to analysis of rapidly moving and distinct plumes in an urban environment.;The CMAX-DOAS instrument was built in 2002, and tested and validated during an intercomparison campaign in Norway in 2003. During 2004 concurrent measurements from multiple viewing geometries were made in Leicester (52.6 oN, 1.12o W). Measured slant columns of nitrogen dioxide from the CMAX-DOAS instrument have errors calculated at less than 2% for a single axis, and 4 to 6% for analysis using a reference spectrum from another axis. These measurements agree well with in situ measurements and identify significant boundary layer concentrations (up to 80 microg m--3) of nitrogen dioxide which clearly correlate with anthropogenic activity over diurnal, weekly and annual timescales.;Through concurrent measurement of different air masses, considerable information on individual plumes has been obtained, including estimates of source location, plume size provide on nitrogen dioxide emissions on an urban scale and are necessary to determine the link between urban activity, nitrogen dioxide emissions, air quality and ultimately human health.
43
Celli, Federico. "Measurement of the differential t/t production cross section at 13 TeV with CMS in the all-hadronic boosted regime." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15829/.
Full textAbstract:
An inclusive and differential measurement of the t/t production cross section in the all-hadronic channel is presented here, using data from 13 TeV pp collisions, collected by the CMS detector at the LHC in 2016, corresponding to an integrated luminosity of 37 fb−1 . The analysis has been performed in the boosted regime, characterized by high-pT top quarks whose decay products are reconstructed, due to the large Lorentz boost, into two wide jets. The inclusive t/t production cross section has been measured to be σt/t = 572 ± 14(stat) ± 118(syst) ± 14(lumi) pb, a value quite lower than the theoretical prediction. An overestimation of the POWHEG + PYTHIA 8 Monte Carlo selection efficiency could explain this effect.
The detector-level differential cross section is then measured as a function of some variables of interest and it is compared to the theoretical predictions.
Finally, an unfolding procedure is performed in order to remove detector effects and to extrapolate the differential cross section measurement to the full parton-level phase space.
44
Armitage, Lewis. "Measurement of the Drell-Yan triple-differential cross-section in pp collisions at √s = 8 TeV with the ATLAS detector." Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/24549.
Full textAbstract:
This thesis presents the measurement and results of the Z/γ* → μ⁺μ⁻ Drell-Yan triple-differential cross-section, using 20.24 fb⁻¹ of ATLAS data recorded in 2012 at a centre-of-mass energy of √s = 8TeV. The triple-differential cross-section is measured as a function of dimuon invariant mass, m_μμ, dimuon rapidity, γ_μμ , and lepton decay angle in the Collins-Soper frame, cosθ*. These dimensions provide sensitivity to the parton composition of the proton through the parton density functions, PDFs, and the weak effective mixing angle, sin²θeff./W, via the forward-backward asymmetry, A_FB. The measurement is performed on and around the Z-boson's invariant mass peak, 46 < m_μμ < 200 GeV, in a kinematic ducial volume of muon transverse momentum, pT > 20 GeV, and muon pseudo-rapidity |η|≤2.4. The results are unfolded from the detector level to the Born, bare and dressed levels, where a precision of < 0:6% is reported in the central bins. The data is combined with an electron channel measurement resulting in a combined result with reduced total uncertainty. The combined result is shown to constrain PDF uncertainties and achieve the most constrained sin²θeff./W uncertainty yet reported at the LHC.
45
Gul, Umar. "Measurement of the fiducial differential cross-section of top quark pair production in the dilepton final state at 8 TeV." Thesis, University of Glasgow, 2018. http://theses.gla.ac.uk/8858/.
Full textAbstract:
The top quark is the most massive fundamental particle of the Standard Model of particle physics and being the only quark which decays before hadronization gives a unique opportunity for studying Quantum Chromodynamics (QCD). This dissertation presents a measurement of differential cross-sections of top quark pairs decaying in a purely leptonic mode as a function of the dilepton invariant mass, transverse momentum, difference in the pseudorapidity and azimuthal angle between two leptons in the same event at 8 TeV proton-proton collision data collected by the ATLAS detector at the Large Hadron Collider. This data corresponds to an integrated luminosity of 20.3 fb−1. Events with top quark pair signatures are selected in the dilepton channel in the ATLAS acceptance (two leptons with pT < 25 GeV and |η| > 2.5). The measured cross-sections are compared to the Standard Model predictions generated using current Monte Carlo generators. All the measurements are found to be in agreement with the SM.
46
Iemmi, Fabio. "Measurement of the inclusive and differential t/t cross sections at 13 TeV in the all-jets boosted regime with CMS." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/12032/.
Full textAbstract:
The t/t production cross section is measured with the CMS detector in the all-jets channel in $pp$ collisions at the centre-of-mass energy of 13 TeV. The analysis is based on the study of t/t events in the boosted topology, namely events in which decay products of the quark top have a high Lorentz boost and are thus reconstructed in the detector as a single, wide jet. The data sample used in this analysis corresponds to an integrated luminosity of 2.53 fb-1. The inclusive cross section is found to be sigma(t/t) = 727 +- 46 (stat.) +115-112 (sys.) +- 20~(lumi.) pb, a value which is consistent with the theoretical predictions. The differential, detector-level cross section is measured as a function of the transverse momentum of the leading jet and compared to the QCD theoretical predictions. Finally, the differential, parton-level cross section is reported, measured as a function of the transverse momentum of the leading parton, extrapolated to the full phase space and compared to the QCD predictions.
47
Savoiu, Daniel [Verfasser], and G. [Akademischer Betreuer] Quast. "Triple-Differential Measurement of the Dijet Cross Section at $\sqrts}$ = 13 TeV with the CMS Detector / Daniel Savoiu ; Betreuer: G. Quast." Karlsruhe : KIT-Bibliothek, 2021. http://d-nb.info/1228439273/34.
Full text
48
Tsionou, Dimitra. "Measurement of the differential production cross section of W bosons and charge asymmetry at √s = 7 TeV with the ATLAS detector." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/3844/.
Full textAbstract:
This document presents a measurement of the production cross section of W bosons and of its charge asymmetry in proton-proton collisions at a centre of mass energy of 7 TeV with the ATLAS detector. These measurements provide information on the momentum fraction of the protons carried by the partons contributing to the W production and therefore allow to better understand the parton distribution functions of the proton. The W candidate events are selected in the W→eν decay mode. The LAr electromagnetic calorimeter plays an important role in the detection of electrons and the author has worked on the on-line energy reconstruction in the LAr detectors. A subject which is treated in some detail is the evaluation of the charge misidentification rates for electrons and positrons. This is a key ingredient for charge related measurements such as the W charge asymmetry. In this document, the W production cross section times the branching ratio is studied inclusively, as a function of the lepton pseudorapidity and as a double differential measurement as a function of the lepton pseudorapidity and transverse energy. The charge asymmetry measurement is presented as a function of the lepton pseudorapidity and as a double differential measurement as well. The data were recorded by the ATLAS detector in 2011 and correspond to 4.7 fb⁻¹.
49
Kim, Giyeon. "Measurement equivalence of the center for epidemiological studies depression scale in racially/ethnically diverse older adults." [Tampa, Fla] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002205.
Full text
50
Goddard, Jack Robert. "A measurement of the low mass Drell-Yan differential cross section in the di-muon channel with √s = 7 TeV proton-proton collisions at the ATLAS experiment." Thesis, Queen Mary, University of London, 2014. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8147.
Full textAbstract:
A measurement of the Drell-Yan differential cross section at low invariant mass is presented in the di-muon channel. A 1.64 pb−1 dataset of √s = 7 TeV proton-proton collision data collected by the ATLAS experiment at the LHC is used. The measurement is made in an invariant mass range of 26 < M < 66 GeV where M is the invariant mass of the muon pair. A review of the relevant theoretical physics and the ATLAS detector is made. The analysis is described with particular attention paid to the determination of the isolation efficiency corrections for the Monte Carlo and the estimate of the multijet background. The fiducial differential cross section is calculated with a statistical uncertainty that varies between 0.8% and 1.2%. The systematic uncertainty is seen to vary between 2.4% and 4.1%. A cross section extrapolated to the full phase space is also presented. This is dominated by theoretical uncertainties from the variation of the factorisation and renormalisation scales. The obtained fiducial differential mass cross section is compared to theoretical predictions at NLO and NNLO in perturbative QCD. It is shown that a move beyond NLO is needed to describe the distribution well due to the restrictions of using a fixed order theoretical prediction. A combination with the electron channel measurement is also briefly discussed as well as comparisons to a di-muon measurement in an extended invariant mass range. This allows similar, but stronger conclusions to be drawn. A discussion is made of a PDF fit that uses the measurement presented here. The fit demonstrates the impact of the measurement on the PDFs and further supports the conclusion that a move to NNLO in pQCD is needed to describe the data.