4,207 research outputs found
Using Perl for Statistics: Data Processing and Statistical Computing
No full textIn this paper we show how Perl, an expressive and extensible high-level programming language, with network and ob ject-oriented programming support, can be used in processing data for statistics and statistical computing. The paper is organized in two parts. In Part I, we introduce the Perl programming language, with particular emphasis on the features that distinguish it from conventional languages. Then, using practical examples, we demonstrate how Perl's distinguishing features make it particularly well suited to perform labor intensive and sophisticated tasks ranging from the preparation of data to the writing of statistical reports. In Part II we show how Perl can be extended to perform statistical computations using modules and by "embedding" specialized statistical applications. We provide example on how Perl can be used to do simple statistical analyses, perform complex statistical computations involving matrix algebra and numerical optimization, and make statistical computations more easily reproducible. We also investigate the numerical and statistical reliability of various Perl statistical modules. Important computing issues such as ease of use, speed of calculation, and efficient memory usage, are also considered.
Reflections on experimental science: Martin Perl
No full textThis is a collection of important lecture and original articles and commentaries by Martin Perl, discoverer of the tau lepton and the third generation of elementary particles, and this year's Nobel Prize winner. This book contains a fascinating and realistic picture of experimental science based on the high energy physics research work carried out by him. Using reprints of his articles with his commentaries, the author presents the various aspects of experimental research in science: the pleasures and risks of experimental work; the pain and frustration with experiments that are useless or fa
An analysis of the PERL Magnetic Resonance Imaging theory and implementation
No full textDue to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to [email protected], referencing the URI of the item.Includes bibliographical references (leaf 32).The goal of PERL MRI in its most basic form is single shot imaging without the need to rapidly switch gradients to encode spatial information into the signal. PERL MRI incorporates the application of the PERL field into the standard spin echo sequence following the excitation of spins, creating an initial phase pattern that causes echoes to form in the signal in the presence of a constant readout gradient. The echo train that occurs can be sampled and decoded into image data using reconstruction methods that are not discussed in this paper. The theoretical analysis of PERL MRI that will be discussed verifies the mathematical basis for the formation of a periodic signal resulting from cyclical coherence of the spins within a homogeneous sample. Theory also indicates a significant reduction in the maximum amount of coherence present in the PERL signal as compared to total coherence that occurs at the center of k-space, indicating that SNR may suffer with this technique. The effects of specific design parameters on the field generated by a proposed PERL coil design layout is discussed, and an experimental design is presented. The experimental PERL coil produces an approximation of the PERL field over a limited spatial region at the center of the coil structure. The PERL MRI pulse sequence was implemented by interfacing the experimental PERL coils to the slice selection gradient channel of a TecMag MRI console. Experiments were conducted using water phantom with varying amounts of PERL prephasing and readout gradient strengths, in an attempt to obtain data confirming the effects of the PERL imaging parameters on the PERL signal. These experiments were inconclusive as to the formation of a PERL echo train, but some form of cyclical coherence appeared to result. The evidence does not suggest that the PERL approach is robust when implemented with the experimental apparatus used in these experiments. Additional experiments are proposed, and possible explanations for the non-ideality of the experimental results are presented
Perl one-liners
No full text130 Time-Saving, Problem-Solving Perl Scripts That Get Things DonePart of the fun of programming in Perl lies in tackling tedious tasks with short, efficient, and reusable code. Often, the perfect tool is the one-liner, a small but powerful program that fits in one line of code and does one thing really well.In Perl One-Liners, author and impatient hacker Peteris Krumins takes you through more than 100 compelling one-liners that do all sorts of handy things, such as manipulate line spacing, tally column values in a table, and get a list of users on a system. This cookbook of useful, customiza
PERL, un freeware de éxito
No full textPara que es el programa PERL, su funcionamiento su mercado de programación, los programas con quien compite m ventaja
Nosokomiale Pneumonie
No full textPneumonia occurring more than 48 h after induction of mechanical ventilation is called ventilator-associated pneumonia (VAP). VAP is the most common nosocomial infection in intensive care medicine and is associated with prolonged intensive care and hospital stay and a higher mortality. The main pathomechanism for development of ventilator-associated pneumonia is not so much the mechanical ventilation per se but more the pathogens passing along the tube towards the lungs. Avoidance of tracheal intubation, strict hygienic measures, reduction of oropharyngeal colonization and the avoidance of microaspiration are the most promising prevention strategies. Therapeutic success in treatment of VAP is coupled to an early diagnosis and therapy. Suspicion of pneumonia is based on clinical and radiologic criteria. Biomarkers and microbiological findings are important for follow-up and reevaluation of the suspected diagnosis
Perl Script
No full textThis Perl script enables you to extract the longest open reading frame (ORF) from nucleatide sequence
A suite of Perl modules for handling microarray data
No full textWe describe PerlMAT, a Perl microarray toolkit providing easy to use object-oriented methods for the simplified manipulation, management and analysis of microarray data. The toolkit provides objects for the encapsulation of microarray spots and reporters, several common microarray data file formats and GAL files. In addition, an analysis object provides methods for data processing, and an image object enables the visualisation of microarray data. This important addition to the Perl developer's library will facilitate more widespread use of Perl for microarray application development within the bioinformatics community. The coherent interface and well-documented code enables rapid analysis by even inexperienced Perl developers. © The Author 2008. Published by Oxford University Press. All rights reserved
Introduction to The Canvas and Other Stories by Salamea Perl
No full textThe Canvas and Other Stories by Salomea Perl is a bilingual Yiddish-English text featuring the only known stories Perl wrote and published in the various Yiddish newspapers of her time. Uncovered after two years of research and translated by Ruth Murphy, the book presents the original Yiddish text and English translation in a side-by-side format. Murphy\u27s translations present Perl\u27s voice to English readers, while Perl\u27s rich, authentic Yiddish brings readers back to the Jewish, Yiddish-speaking streets of turn-of-the-century Poland. The insightful introduction by Dr. Justin Cammy gives the historical background of both the text and its author. The work of Salomea Perl, an author completely unknown until these translations, is an important addition to ongoing discovery of female Yiddish writers.
Salomea Perl (1869-1916) was born in the town of Lomża (now Poland) and raised in the larger city of Lublin. After completing studies at the University of Geneva, she settled in Warsaw. Her Yiddish first stories were published n Yontev Bletlekh, the self-proclaimed radical magazine published by Y. L. Peretz, starting in 1895. Her seventh and final known Yiddish work was published in 1910.
The publication here of all seven known stories by Salomea Perl is not only important because it marks the rediscovery of a forgotten Yiddish writer. It also allows us to consider her unsentimental portraits of a Jewish world in transition. Her stories reveal deep class divisions and the prevalence of Jewish poverty. She investigates how the religious values that guided everyday life often lacked compassion for lived experience. Perl explores the social and cultural ruptures caused by internal migration from small towns to big cities, and new manifestations of secular Jewish identity associated with modern life.
At the same time, for every frayed relationship between a husband and wife or a daughter shunning her father, Perl\u27s fiction also reveals unassuming acts of self-sacrifice and modesty. For every abandonment of religious obligation in favor of the seductions of the secular-modern world there remain those who are content to carry on lives of relative simplicity.
From the Introduction by Justin Cammy, Associate Professor of Jewish Studies and Comparative Literature at Smith College in Northampton, Massachusetts
Source: Publisherhttps://scholarworks.smith.edu/jud_books/1005/thumbnail.jp
Perioperative thermal management
No full textPerioperative hypothermia can influence clinical outcome negatively. It triples the incidence of adverse myocardial outcomes, significantly increases perioperative blood loss, significantly augments allogenic transfusion requirements, and increases the incidence of surgical wound infections. The major causes are redistribution of heat from the core of the body to the peripheral tissues and a negative heat balance. Adequate thermal management includes preoperative and intraoperative measures. Preoperative measures, e.g., prewarming, enhance heat content of the peripheral tissues, thereby reducing redistribution of heat from the core to the peripheral tissues after induction of anesthesia. Intraoperative measures are active skin surface warming of a large body surface area with conductive or convective warming systems. Intravenous fluids should be warmed when large volumes of more than 500-1000 ml/h are required. The body surfaces that cannot be actively warmed should be insulated. Airway humidification and conductive warming of the back are less efficient
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