ASIGN5_SMT312 Essay Example | Topics and Well Written Essays - 750 words

ASIGN5_SMT312 - Essay Example Energy costs take 8% of the GDP of the United States. The United States is conducting a geological survey to evaluate its oil reserves. OPEC refers to organization of the petroleum producing Exporting countries. This is a cartel of twelve countries namely United Arab Emirates, Saudi Arabia, Ecuador, Venezuela, Iran, Qatar, Libya, Nigeria Kuwait, Angola, Iraq and Algeria. The headquarters of OPEC are in Vienna. They hold regular meeting represented by member countries oil ministers. In 2008 Indonesia withdrew from the group due to its declining reserves. The countries with the most coal reserves in the world are the United States, Russia and China respectively. There are about 847 billion tones in the world. These are enough deposits to last the entire world for the next 130 years at the existent level of production. A survey conducted by the United States Geological Survey show areas around Arctic Alaska, Amerasia, East Greenland Rift Basins in North America have large deposits tar sand. It’s estimated that 84% of gas and oil production would take place off shore. Like any non-renewable energy source tar sand affect the environment. When being mined toxic chemical infiltrate rivers and other water bodies. In addition because of the high carbon emission it causes deforestation. Most of time a large section of trees, bushes, top soil are cleared thereby causing environmental degradation. The oil crisis in 1973 emanated when the then Organization of Arab Petroleum Exporting placed an oil Embargo on the United States of America. It came about after the United States supplied Israeli with military equipment during the Yom Kippur War. The embargo was placed on October 1973 to march 1974 (Campbell, 89). 16 The 1979 oil crisis which is also known as the second oil crisis resulted from the Iranian Revolution. Massive protests that led to the fleeing of Mohammed Pahlavi, Shah of Iran, also disrupted the county’s oil sector

Wheelchair Basketball Essay Example | Topics and Well Written Essays - 2500 words

Wheelchair Basketball - Essay Example The fact that these soldiers were recently paralyzed led to a lot of frustration and no outlet for them to channel their energy. As they began rehabilitation and searched for a physical outlet to relieve stress they decided what better than sports? (Schweiker: 1954) The soldiers began with sports such as ping-pong, catch and pool, then it went to bowling, volleyball and swimming, then to the more energy requiring sports such as water polo, touch-football, softball and basketball. Although several other sports have now been added, it was basketball that overshadowed the others in a few years time in overall popularity. In 1946, other historical documents reveal that the California Chapter of Paralyzed Veterans of America played the very first match of organized wheelchair basketball, two weeks prior to the New England Chapter. According to these facts, it thereafter spread across the nation to the VA hospitals in Chicago, Memphis, Boston, Richmond and New York. Not before long, the sp ort had spread across the border to the UK and to Canada as well. (Schweiker: 1954) By time 1948 rolled around, there were six teams in total in the United States. All were members of the PVA and all functioned from Veteran hospitals. This was the same year that the Birmingham, California team obtained a sponsored tour to travel by plane, and play other paraplegic teams across the nation. The immediate result of the first sponsored tour of the Birmingham Flying Wheels was the development of the first wheelchair basketball team outside of VA hospitals in Kansas City. The first ‘civilian’ hometown team was known as the Kansas City Wheelchair Bulldozers (later known as the City Rolling Pioneers). (Schweiker: 1954) In 1955, the Touring U.S. Pan Am Jets team was the first to bring wheelchair basketball to England, when they participated in the first international competition at Stoke Mandeville. (GBWA.org: 2011) Now, there are several teams throughout the United Stated, UK, and rest of the world. The first World Championships for Men, the G old Cup, took place in Bruges, Belgium in 1975, but has long since continued on thereafter. In the UK, The Great Britain Wheelchair Basketball Association governs wheelchair basketball. The GBWA is a registered charity and forms the representative body of wheelchair basketball in Northern Ireland, Scotland, Wales and England. Teams in the GBWA league consist of the RGK TCAT Rhinos, Sheffield Steelers, Teamside Owls, GLL Capital City Raiders, Essex Outlaws, Knights and Aces. However there are several more teams at different divisional levels. GBWA.org: 2011) Aside from the GBWA there is also the Welsh Wheelchair Basketball Association WWBA. The International Wheelchair Basketball Federation (IWBF) governs the sport itself. The height of the basket and the size of the court are the same as in the running version of the game (10 feet from the floor and 28mx 15m, respectively). The duration of for all international games is 40 minutes. In terms of eligibility, athletes using wheelchairs play wheelchair basketball, and whose disabilities might include lower limb amputations, paraplegia, polio and cerebral palsy. In general terms, any individual who cannot participate in stand-up running basketball as the direct result of an injury, disabling condition, etc. is eligible to play wheelchair basketball. It is important to note that not all participants in wheelchair basketball use a wheelchair for daily living. (Paralympics.org: 2011). Other important classifications to notice are the points rating system. Athletes in wheelchairs are classified by their physical

Arab Heritage Discussion Essay Example | Topics and Well Written Essays - 250 words

Arab Heritage Discussion - Essay Example Nasser, respecting culture and respecting human rights issues. The nurse in this context should avail the right drugs to the patient as mother and daughter are culturally accustomed to over the counter prescription but schedule a follow up appointment the following day as the authority of physicians is seldom challenged Mrs. Nasser is to return with her daughter and a trusted elderly relative the following day for the follow-up examination. It is also advisable that when addressing this issue a health practitioner of Arab descent and a woman to be available during the follow-up. The nurse who preferably is a woman should explain the symptoms gradually with assistance from the health practitioner and the elderly relative. To address Mrs. Nasser’s concerns, the nurse should encourage the all three women to observe the nurse as she examines Samia explaining what she is doing. This should be done only after Mrs. Nasser understands that her daughter’s health should be taken to consideration and has given consent for the exam to be done. This is because according to Arab culture informed consent is highly valued (Purnell, 2014; Purnell,

Hotensios wife Essay Example for Free

Hotensios wife Essay Petruchio would say this in a condescending way because he thinks that a wife should obey her husband at all times and come to him even when she is busy.  Ay, and a kind one too. You not a worse  Gremio would say this in a respectful way to Lucentio, but at the same time being contemptuous towards Petruchio.  Sirrah Biondello. Come to me forthwith  Hortensio would say this in more of an imposing way than Lucentio did to summon his wife. This would make the audience believe that Hotensios wife would definitely obey him.  Biondello exits the room the same way as before, through the oak doors, and you hear him running down the hall. I am afraid, sir. not be entreated.  Hortensio says this very derisively towards Petruchio because both Hortensio and the audience still think that Petruchio is idiotically wasting his money.  Biondello yet again comes back out of breath and with bad news.  She says you have. You come to her.He tells Hortensio this in a very disdainful way because Hortensio was becoming very overconfident about the bet especially after Lucentio had failed with Biannca.   Worse and worse! She will not come. Come to mePetruchio is mocking Hortensio because his wife gave an even worse answer than what Biannca gave to Lucentio. He then tells Gremio to order Kate to come to him; he says this in a very superior way. I know her answer  Hortensio says this in a very pompous tone of voice. I would make Hortensio say it in this way because I want the audience still to think that Biannca is not going to come and that Petruchio will be disgraced.  Just before the doors open the gentlemen are laughing at the expense of Petruchio because they think he has done all this boasting about Kate being tamed and she wont obey him. As soon as the doors open and the audience see Kate I think that they would be very surprised and shocked, so I would make all the actors except Petruchio to faint to add a comical side to this instant. What is your will, sir, that you send for me?  Katherina would say this in a very delicate voice and whilst saying this she would curtsy. This would also be a shock to the audience because they are used to Kate being very forceful in her dialect and in her physical presence.  Go fetch them hither. Bring them hither straight.  Petruchio would say this in a very condescending manner to Kate. As soon as Petruchio has finished Kate abruptly rushes off to fetch the other women. Heres a wonder, if you talk of a wonder.  Lucentio says this in a very astounded way. He says this because he cannot believe what he is seeing, I would expect the audience to feel the same because throughout the play Kate has never done anything she did not wish to do.  Marry, peace it bodes. sweet and happy.  Petruchio is saying that Life with Kate is going to be a happy one; the audience have started to see that Petruchio loves Kate and did all those cruel things so that she could live in peace with him. Nay, I will win my wager. virtue and obedience.  Petruchio wants to prove what a good job of taming her he has done and how dutiful she is know.  Kate then enters dragging Biannca and the widow by their hair through the large oak doors. When the door shuts she lets them go and walks towards Petruchio.I would your duty. Since supper time.   Lucentio is very disappointed with Biannca and the actor would bring this out by saying these lines in a very saddened way.  The more fool you for laying on my duty.  Biannca would say this in a very patronising tone of voice. The audience would be quite astonished by Bianncas reply to Lucentio because she is usually very quiet and obedient. Katherine, I charge thee. Lords and husbands.  Petruchio wants Kate to tell the people how a lady should act towards her husband/lord. The crowd will think that although Kate has changed she will not lower herself to that level. But she does in a way that still leaves her with a vast amount of pride.  Kate starts her speech by insulting the widow and saying that she should respect her master  Fie, fie unknit that threatening unkind. Thy governor.  She would say this in a very sarcastic, but malicious way. I would get the actress to say it in that way because although Kate does respect Petruchio she also has her own will and she also wants to intimidate the widow. As Kate would be saying this I feel that she should walk towards the widow in an ominous manor. As Kate walks up to her, the widow would cower away into a corner. This will show the crowd that Kate is still domineering and robust. It blots thy beauty. meet or amiable  Kate is saying that being angry all of the time hides the fact that underneath that fiery surface is a beautiful majestic lady. The audience will at this stage think that what Kate is saying is ironic because she was once fiery, but now the audience will start to realise that women who act this way disgust her.  Thy husband is thy. Sea and land  This is where Kate is saying how she expects other women to feel about their husbands because this is the way that she feels about Petruchio. Whilst she is saying this she will go up to Petruchio and kneel in front of him to show the audience how much respect she has for her husband. Too little payment for so great a debt. owes the prince.  She is saying that women have a good life and hardly have to repay their husband for all the tasks he has to do for her. As she says this she will scan across the room glaring at the other wives as if to say that they do not repay their husbands enough and should be thankful that he hasnt left them.  I am ashamed that women are so simple. Love obey.

A healthy heart

A healthy heart abstract A healthy heart is the key to good life .The heart is a vital organ of the human body which ensures the effective pumping of blood throughout the circulatory system. Due to our sedentary lives and food habits, the heart is prone to malfunctioning, and heart attack (i.e. coronary artery disease), is one of the primary cause of death [1]. Heart attack is caused by a blockage of the coronary arteries, typically at a site of narrowing (stenosis) caused by atherosclerosis. It is difficult to accurately determine the degree of atherosclerosis in arteries, particularly in the early stages of disease. One method that has been introduced is the intravascular ultrasonic catheter (IVUS), which sends a pulse of sound from a receiver and uses the returned echo to deduce the properties of the arterial tissues. Doppler Ultrasound is a similar a diagnostic, noninvasive technique which can effectively evaluate the blood flow velocity in the coronary arteries by passing the high frequency ultrasound waves into the blood using a single receiver. Our group has found that an improvement in velocity estimation can be obtained if the returned Doppler ultrasound echo is collected by multiple receivers and the information from those receivers is combined. The research proposed here will use simulation methods to determine the extent to which this same concept can be applied to multiple IVUS receivers. 1. introduction Doppler ultrasound provides a measure of the velocity distribution of blood throughout the volume of the artery. Because the signal is a superposition of echoes from multiple scatterers, the red blood cells, distributed in space, the signal at the receiver is subject to constructive and destructive interference. This phenomenon is called coherent scattering and is the primary reason that Doppler ultrasound signals are inherently noisy. The same phenomenon applies to ultrasonic imaging (B-mode imaging), in which the Doppler shift is ignored and only the magnitude of the returned signal is used to form an image of the tissue. However, in B-mode ultrasound, the scatterers are variations in the acoustic impedance of the tissue. Figure 1 shows a typical IVUS image [6]. Whereas it is possible to differentiate between the lumen, media and adventitia, the exact boundaries are difficult to determine as a result of the coherent scattering effects. 2. background 2.1. Principles of Ultrasonic B-Mode Imaging B mode imaging is typically used for ultrasound imaging as it facilitates the display of the echoes at various brightness or gray levels corresponding to their amplitude.[ee handbook] Most B-mode systems in use today create an image in 0.1 s or less, so that the image is displayed in real-time for viewing of moving structures, such as structures in the heart or the fetus moving within the womb. This is not possible with the typical magnetic resonance or computed tomography system. Most of these systems use the Doppler principle, but some use time domain detection. In Doppler detection, if the ultrasound is reflected from a target moving at some speed vt toward (away from) the source at an angle q with respect to the beam axis, the frequency of the transmitted signal f is shifted up (down) by an amount fD, the Doppler shift, according to the following relation: (116.4) In principle a measurement of fD, when f, c, and q are known, will yield the speed of the target vt. However, it is often difficult to determine q because the angle the transducer axis makes with a blood vessel, for example, is often unknown. Even when that angle is known, the flow is not necessarily along the direction of the vessel at every location and for all times Two-dimensional B-mode display: Echoes from a transducer, or beam, scanned in one plane displayed as brightness (or gray scale) versus location for the returned echo to produce a two-dimensional image. Duplex ultrasound: Simultaneous display of speed versus time for a chosen region and the two-dimensional B-mode image. B-mode display: Returned ultrasound echoes displayed as brightness or gray scale levels corresponding to the amplitude versus depth into the body fig 6 in devts in cardio vascular ultrasound.pdfdescribes input signal used B -mode (Brightness mode) ultrasound is the most commonly applied ultrasound technique for intracoronary artery visualization. B-mode images are made up of one dimensional signals from transducer crystals aligned in an arrays,which can also be displayed in two dimensional in the form of a sector[August et al].In This mode of imaging, depth and the brightness are the measure of radial axis and echo intensity. 2.1.1. Scattering of sound echo description fundamental sources of errors 2.1.2. Relationship between sound intensity and scattering coefficient The size of the scattering shadow is called the effective cross-section (s [cm2]) and can be smaller or larger than the geometrical size of the scattering particle (A [cm2]), related by the proportionality constant called the scattering efficiency Qs [dimensionless]: The scattering coefficient  µs [cm-1] describes a medium containing many scattering particles at a concentration described as a volume density s [cm3]. The scattering coefficient is essentially the cross-sectional area per unit volume of medium. Scattering coefficient: The factor that expresses the attenuation caused by scattering, e.g., of radiant or acoustic energy, during its passage through a medium. Note: The scattering coefficient is usually expressed in units of reciprocal distance. Attenuation: The decrease in intensity of a signal, beam, or wave as a result of absorption of energy and of scattering out of the path to the detector, but not including the reduction due to geometric spreading. [After JP1] Note 1: Attenuation is usually expressed in dB. Note 2: Attenuation is often used as a misnomer for attenuation coefficient, which is expressed in dB per kilometer. Note 3: A distinction must be made as to whether the attenuation is that of signal power Measurement of the intensity distribution of laser radiation using by VV Morozov 1979 Related articles All 4 versions of interaction between the light and sound, i.e., in which the scattering coefficient would depend linearly on the sound intensity. 2.1.3. Constructive and destructive interference Sound travels in the form of waves.These waves are associated with frequency and amplitude.From basic laws of physics it is known that intensity is directly proportional to amplitude of the wave which is the discriminating factor between different modes of ultrasound imaging.When these sound waves interact with each other interference occurs.The type of interference is determined by measuring the amplitude of the resultant wave formed by interaction of 2 sound waves.If the amplitude of 2 waves is either positive or negative then the resultant wave has larger amplitude.This phenomenon is known as constructive interference(or in phase interference). If the interacting waves have opposite amplitude then the resultant wave has a lower amplitude.This phenomenon is known as destructive interference(or out of phase interference). The interference type depends on the difference in distances that each wave has to take. In this context,if the ultrasonic signals are emitted from a single transmitter and captured from multiple receivers separated by a distance of half the wavelength, then we can observe constructive interference of returned echo amplitudes of the scaterrers locate d in region of interest at one receiver and destructive interference occurring at the second receiver located half the wavelength apart.[cite reference wu thesis book]. 2.1.4. Signal processing for B-Mode images (e.g. envelope detection) Intracoronary ultrasonic is done on envelope detection of the sum of (returned) echo signals from each receiver .there are many/three ways of envelope detection. One simpler method of doing it is to perform a full wave rectification on the returned echo followed by a low pass filtering to remove the side lobes of the signal. [rectify/demodulate the signal and process it by passing it through a low pass filter to remove the side lobes of the returned echo].though this method of envelope detection appears to be simpler, the operating center frequency for each of the returned signal is to be known and possibly tracked from time to time for changes. The second/another yet complex method of envelope detection is using Hilbert transform to get /generate/create a rational /methodical representation of the returned signal from each scatterer at each receiver. The advantage of using this method is that it is independent of the dampening effect present in the returned signal. (i.e. the changes in center frequency of the echo with time).The magnitude obtained from the complex signal is used as the final signal for ultrasonic imaging/next stage of converting into polar plots and plotting it using weighted average method . (refr:sprab12 page 11 and B-mode handbook).quadrature detection can also be used for extracting the envelope of the signal.refrce(high resolution ultrasound) 2.2. Current implementations of intracoronary imaging Heart disease can be diagnosed with the aid of Doppler and B-mode ultrasound, where the Doppler method provides a measure of flow rate and B-mode ultrasound provides an image. Generally these techniques, as typically used, do not have the spatial resolution to examine flow in the coronary arteries. Coronary artery geometry is diagnosed by injecting a radio-opaque dye into the artery with a catheter and taking x-ray images. However, this method does not specifically provide the locations of atherosclerotic lesions. It provides the internal geometry of the arterial lumen. Intracoronary Doppler ultrasound is a method in which a Doppler-tipped catheter is inserted into the coronary artery to measure blood velocity. IVUS uses a more complicated catheter that has an array of ultrasound crystals arranged in a ring at the tip of the catheter, and each crystal transmits an ultrasound pulse radially and then receives the returned echo. With multiple crystals, a 2-dimensional image of the cross -section of the arterial lumen can be reconstructed. This technique is currently capable of providing real time cross sectional images in vivo [3]. The main objective of Doppler ultrasound is to extract the flow velocity measurements and interpret them in physiologically significant variables through assumptions and velocity calculations [2]. The most fundamental quantity we consider is the flow rate as it best describes the extent of perfusion of blood in the region of interest [2] (i.e. a section of the coronary artery). The objective of IVUS is to obtain a mapping of the make-up of the artery as an image. Although IVUS uses several transmitter-receivers, only a single receiver is being used to capture the reflected ultrasound wave and to view the circumferential view of the artery. The problem involved by using a single receiver is that we miss many precise details about the physiological status of the artery due to its limited view and the obtained images are noisy because of coherent scattering. The possible solution can be to use multiple receivers to look at the region of interest from different angles to get a detailed view. The doctor can get a clear picture of the artery in terms of velocity, flow rate, the size of plaque present inside artery and can treat the patient in a better way. 2.2.5. Geometry of the transducers. We assume transducer as a point size spherical shaped piezoelectric crystal. Papers: B-mode handbook.pdf sprab12.pdf page 7 2.2.6. Transducer frequency response characteristics. The phrase frequency response characteristic usually implies a complete description of a systems sinusoidal steady-state behavior as a function of frequency. 2.2.7. Specifics of the transmitted signal from program 2.2.8. Signal conditioning and signal processing 2.3. Limitations of intracoronary imaging (particularly coherent scattering/scattering from multiple scatterers) One of the main problems encountered with Doppler and B-Mode ultrasound velocity estimation is coherent scattering of noise. Coherent scattering error is caused by the changes in phase of the reflected echo as the red blood cells enter and leave the sample volume. This phase depends on the distance of the transmitter to the scatterer and then to the receiver [5]. The main research objective is to simulate this process of multiple receiver Doppler ultrasound using Matlab simulation software and to see how well it improves the understanding of image quality and clarity. Even the state of art of image is to be observed using the simulations. paper : basic model of ivus.pdf page 8 Intravascular ultrasonic image quality remains poor due to speckle noise, imaging artifacts and shadowing of parts of vessel wall by calcifications. (Refce: intravascular ultrasound image segmentation.) 2.4. Previous work done on multiple receivers independence of coherent scattering noise in Doppler signals when receivers are sufficiently far apart. Velocity Measurements made/obtained over the region of interest (ROI) in an intracoronary artery have inherited velocity estimation errors due to coherent scattering. One of the methods to reduce these estimated errors is the use of multiple receivers .The echo received from each of the receivers will have some complementary information which not only improves velocity estimation, also contributes in enhancing the image clarity in a B-mode ultrasound image processing. [Jones, Krishnamurthy 2002] Improvement in velocity estimation is observed if returned Doppler ultrasound echo is collected and combined from all the multiple receivers. Most importantly the returned echo signal obtained at each receiver is independent of coherent scattering noise in Doppler signals when receivers are sufficiently far apart. In the case of an intracoronary artery, the RBCs are the major kind of multiple scatterers distributed in artery space. Since the returned echo signal detected/obtained at each of t he receiver is a summation of all the echo amplitude signals from multiple scatterers in the region of interest, they are subjected to constructive and destructive interference This way multiple receivers in B-mode can improve the image quality of B -mode intravascular ultrasound (IVUS) images. Initially a 2 dimensional geometry for the artery would be simulated. The transmitted signal would be generated using by a piezoelectric crystal in an ultrasound in real time applications. But in this proposed research, using Matlab, we first try generating a discrete signal using the pulse generator. Based on the defined parameters such as the frequency, pulse width, amplitude, pulse repetition time, artery geometry[r (?)], angle of transmission of the transmitted and received signal, the image would be extracted. Primarily, the signal from a single scatterer is modeled. In the advanced stages, multiple scatterer signals would be modeled. The following questions would be answered while doing the actual simulation. Each scatterer is modeled as a point source that reflects the transmitted signal with a set reflectivity. The scatterer does not alter the signals phase, but alters the amount of power that is returned to the receiver. Each receiver therefore is subjected to a signal that is the sum of returns from all of the scatterers, where it is important to keep track of the phases of the signals from each scatterer so that coherent scattering is adequately accounted for. The signal at each receiver is rectified and then averaged in time with a moving window to produce a signal that represents scattered power as a function of time. The range, corresponding to the location in the image, is proportional to the delay time of the returned signal. Each receiver will provide an image, and a composite image will be produced as the average over all of the receivers. 3.4.1. Transmitter/Receiver characteristics (transmitted frequency, beam width) 3.4.2. Speed of sound 3.4.3. Scattering coefficients for (1) Background and (2) Plaques The fraction of the incident energy reflected or scattered is very small for soft tissues like elastin collagen etc. [ee handbook] The differential Backscattering coefficient/scattering coefficient is the aspect that expresses the attenuation caused by scattering, of acoustic energy, while passing through a medium. The scattering coefficient ( µs) is usually expressed in units of reciprocal distance. There certainly lies a difference between the normal aortic intima and various kinds of atherosclerotic plaques. More than 90% of normal vessels usually have scattering coefficients in the range of 15 mm-1 to 36 mm-1 ,where as atherosclerotic plaques like the lipid rich blocks, fibrocalcific plaques have scattering coefficients lesser than 20 mm-1 [Levitz, Andersen et al ].The fibrous plaques which constituted elasin ,lipids and collagen demonstrated a relatively large variations in terms of scattering coefficient. Out of the three kinds of atherosclerotic plaques, fibrocalcific sample s do not show up as sharp regions in any kind of image and hence can be assumed as in homogeneities within the tissue wall having highly scattering coefficient. 3.4.4. Random numbers (particle location and scattering coefficients) 3.5. Signal Analysis (envelope detection) http://www.mathworks.com/products/demos/shipping/dspblks/dspenvdet.html Hilbert Transform can be used to generate a time domain envelope. The point is to create a rectified signal that is more suitable for calculating a smooth envelope. In the frequency domain, magnitude data is already all positive, so I dont know why youd use Hilbert Transform. To get a spectrum envelope, just average several spectrum frames together. The key then is to choose correct frame size prior to FFT, which should be based on the nature of your data and the sampling rate you are using. Averaging will help your SNR and maybe you can differentiate key frequencies between good and damaged bearings. x = Hilbert (xr) returns a complex helical sequence, sometimes called the analytic signal, from a real data sequence. The analytic signal x = xr + i*xi has a real part, xr, which is the original data, and an imaginary part, xi, which contains the Hilbert transform. The imaginary part is a version of the original real sequence with a 90 ° phase shift. Sines are therefore transformed to cosines and vice versa. The Hilbert transformed series has the same amplitude and frequency content as the original real data and includes phase information that depends on the phase of the original data. If xr is a matrix, x = Hilbert (xr) operates column wise on the matrix, finding the Hilbert transform of each column. x = Hilbert (xr, n) uses an n point FFT to compute the Hilbert transform. The input data xr is zero-padded or truncated to length n, as appropriate. The Hilbert transform is useful in calculating instantaneous attributes of a time series, especially the amplitude and frequency. The instantaneous amplitude is the amplitude of the complex Hilbert transform; the instantaneous frequency is the time rate of change of the instantaneous phase angle. For a pure sinusoid, the instantaneous amplitude and frequency are constant. The instantaneous phase, however, is a saw tooth, reflecting the way in which the local phase angle varies linearly over a single cycle. For mixtures of sinusoids, the attributes are short term, or local, averages spanning no more than two or three points. Reference [1] describes the Kolmogorov method for minimum phase reconstruction, which involves taking the Hilbert transform of the logarithm of the spectral density of a time series. The toolbox function rceps performs this reconstruction. For a discrete-time analytic signal x, the last half of fft(x) is zero, and the first (DC) and center (Nyquist) elements of fft(x) are purely real. http://dip.sun.ac.za/~weideman/research/mfiles/hilb1.m function h = hilb1(F, N, b, y)% The function h = hilb1(F, N, b, y) computes the Hilbert transform% of a function F(x) defined on the real line, at specified% values of y (y could be a scalar, vector, or matrix.) 8. bibliography http://www.johnshopkinshealthalerts.com/white_papers/heart_health_ch_wp/digital08_landing.html, last accessed on 02/26/2008, 08:30 pm. Jones SA, Fundamental Sources of error and spectral broadening in Doppler ultrasound signals, Crc critical reviews in Biomedical Engineering, page(s):399-483, 1993. Van der Steen AFW, Cespedes EI, de Korte C.L, Carlier S.G , Li W, Mastik F, Lancke C.T, Borsboom J, Lupotti F, Krams R, Sermys P.W, Bom N,Novel developments in intravascular imaging, Ultrasonics Symposium Proceedings, IEEE, Volume 2, page(s):1733 1742, 1998. Kumar P and Shoukri MM, Copula based prediction models: an application to an aortic regurgitation study, BMC Medical Research Methodology, page 7:21, 2007. Jones SA and Krishnamurthy K,Reduction of coherent scattering noise with multiple receiver doppler, Ultrasound in Med. Biol., Volume 28, page(s): 647-653, 2002. Zhu H, Oakeson K D, and Friedman M H, Retrieval of Cardiac Phase from IVUS IVUS Sequences, Medical Imaging 2003: Ultrasonic Imaging and Signal Processing, Volume 5035, 2003 page(s): 1605-7422.

Music :: essays research papers

It has been years since I wrote anything at all, although people do see me writing odd pieces of music. But this time I am writing about my past, the past that seems so far away and forgotten. I know that this account is hardly going to interest anyone, but I do need to share my feelings with someone, or in this case, with something. People see me as a berserk creature talking garrulously of her past that probably never existed. And that is the belief of ignorance. They pity me, speak sympathetically and listen to me the gibbering about my past and my feelings. But do they really want to know about my feelings? No they don't, but if they did I would never tell them. Night after night, I sit ruminating about my long-forgotten past. And flashes of it just appear out of nowhere. A young cheerful, little girl with red hair, playing in an overgrown garden with her friends and looming against the sky was her very own castle. It wasn't much but at least it was hers. So innocent she looked, having no clue of what her future might hold. She lived happily with her parents and playing with her headless dolls, while occasionally listening admiringly to her mother playing her tiara. How she longed to play just like her mother. And she slowly learned to play it. She had dreams all right, not about the tiara, but completely different from it. Dreams just like a girl of her own age would have. Dreams of her Prince Charming sweeping her off her feet and taking her away to Paradise...to the land of eternal happiness and live happily ever after. After years of patiently waiting, he finally entered her life. And a Prince Charming he was- with dark lean features and as tall as a giant. She wasn't sure whether or not he was her Prince, but what she was sure about was that she loved him. Loved him with all her heart, and was ready to go to the darkest corner of the world just for him. After a short love affair the young couple married. But what the young wife found out after the marriage struck her much harder than a lightning bolt. It was like an explosion. He was a drunkard! And she couldn't do anything about it. She was shattered and was like a broken soul. All her dreams she had of their happy future together seemed so far away.

A Room of One’s Own Critical Analysis

Many intelligent and creative women can make great contributions to the society if they are given space and time. However, for many years women have been viewed as less intelligent, merely mothers, and objects of ownership.In A Room of One’s Own, a novel by Virginia Woolf, the author argues that Shakespeare’s sister is as talented as her brother and that she can make great contributions to her society.In chapter, six Woolf clearly demonstrates her opinion and attitude towards patriarchal society. She portrays her judgment through use of language, narrative, style and other viewpoints about man, their dominance and female subservience.She uses sarcasm and irony combined with a lot humor to emphasize her argument as she contradicts the general opinions of men. She reminds women that what they want depends on them and that they should leave exhortations to men. She however criticizes women for lack of motivation and spirit by referring to them as â€Å"disgraceful ignoran t.†Through this the extract, the author gives hope to others but she is also realistic about the society developing a culture of equality. She tells women that it is very important to be their selves than to be anything else, a statement which contradicts men’s belief that women are objects of ownership and are merely mothers.Woolf seeks revenge against the society which is patriarchal through the characters of Mr. John Davies and Professor X. For example, Professor X is not given a name or identity (Davis).The author sarcastically calls men â€Å"great minds†¦Ã¢â‚¬ ¦.are androgynous,† meaning that the part of the male’s mind should work together with women to create something that is original (Davis). She tells the writers that they should not think about their sex but should focus on the story that they are about to write.In conclusion, it is ironic that, in this book she does not talk about a matriarchal society but only talks about the society whe re women and men are equal.Works CitedDavis, C.   A Room of One's Own: Critical Response.   July 9 2010.  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   http://www.dadooda.com/index.cfm/fa/library.detail/Library_ID/8016