76,582 research outputs found
Self-consistent time-domain large-signal model of traveling-waveelectroabsorption modulators
No full text
The Folio: F. C. C. Magazine
No full textEditorial. pp. 1-2; Samuel, V. M.-Essay-Pilgrimage to Lincoln's Tomb. pp. 2-7; Burke, D. C.-Article-Self-Importance. pp. 7-10; Chaubey, S. K.-Article-The Artist's Cry. pp. 10-11; The Co-Eds' Corner. pp. 11-12; Ranjit Kumar-Whiffs of Wisdom. pp. 12-13; Goverdhan Das-Poetry-Moments of Tryst. pp. 13; Kak, B. N.-Tourism-Kashmir. pp. 13-15; Satyindra Singh-News and Notes. pp. 16-18; W. P. B. pp. 19-20; News from the Outposts. pp. 20-21; The Alumni Corner. pp. 21-22; In Memoriam. pp. 23-24; [Hindi]. 12 p.; Punjabi Kiyari [Punjabi]. 4 p.; The Folio [Urdu]. 16 p.S. Bhagat Singh Malhotra, K. B. S. Maqbool Shah. after page 20; M. K. Tandon, Masud H. Sayid, Philipose Mathai. after page 22; M. L. Banerji, Rev Canon A. B. Chandu Lal, Rev J. Ali Baksh, Mangat Rai, Malik Mohd. Shafi. after page 2
Balanced Electroabsorption Modulator for High-Linearity, Low-Noise Microwave Analog Optical Link
No full textThe paper presents a new device for analog optical links, the balanced electroabsorption modulator, to allow the simultaneous cancellation of laser relative intensity noise, all even-order distortions, and third order intermodulation. The RF photonic link employing the new balanced modulator shows great improvement in the overall link performance with respect to conventional links using a single electroabsorption modulator. Moreover, it favorably compares with the to date highest performance links employing lithium niobate cross-coupled Mach-Zehnder modulators, proving itself an enabling technology for placement of all-semiconductor radio-frequency lightwave transmitters in high performance analog fiber optic links
Balanced ElectroAbsorption Modulated RF Photonic Link
No full textWe propose a novel high linearity, low noise analog photonic link using a balanced
electroabsorption modulator. It simultaneously cancels all common-mode intensity noises,
even-order distortions and suppresses the third order intermodulation, achieving shot noiselimited
performance
D-branes, RR-fields and duality on noncommutative manifolds
No full textWe develop some of the ingredients needed for string theory on noncommutative spacetimes, proposing an axiomatic formulation of T-duality as well as establishing a very general formula for D-brane charges. This formula is closely related to a noncom4 mutative Grothendieck-Riemann-Roch theorem that is proved here. Our approach relies on a very general form of Poincaré duality, which is studied here in detail. Among the technical tools employed are calculations with iterated products in bivariant K-theory and cyclic theory, which are simplified using a novel diagram calculus reminiscent of Feynman diagrams
Genital and urinary tract infections in pregnancy in southern India : diagnosis, management and impact om perinatal outcome
No full textBackground: Prevalence of sexually transmitted infections varies in different parts of the world. These infections, occurring during pregnancy, can result in adverse outcome. There is paucity of information on the prevalence, effects and management of such infections in pregnancy in India. Similarly, urinary tract infection (UTI) is a common medical problem in pregnancy. But, very little is known about the patterns and mechanism of antimicrobial resistance among bacteria causing UTI and the prescription practices for this condition. Diagnostic methods, used for early onset sepsis (EOS) in the new-born also need evaluation.Methods: Endocervical samples from consecutive pregnant women at 26 to 36 weeks of gestation were tested to detect infection with Chlamydia trachomatis. Association of this infection with adverse pregnancy outcome was determined In another retrospective cohort study, information related to pregnancy and outcome was collected from pregnant women with reactive Venereal Disease Research Laboratory (VDRL) test, which was done as part of antenatal care. Data on susceptibility patterns of bacteria isolated in significant counts from urine of pregnant women suspected to have urinary infection were collected. To understand the mechanism of resistance, the prevalence of integrons among these E. coli were determined Prescribing patterns for these infections were ascertained using a questionnaire and based on antibiotics dispensed to pregnant women. To evaluate the use of CRP in diagnosing EOS, CRP levels in cord blood and neonatal blood at 24 hrs were estimated in two groups of neonates, one at risk of developing infection and the other at low risk of infection.Results: Prevalence of C trachomatis infection was 3.3% and this infection did not contribute significantly to adverse pregnancy outcome. Prevalence of syphilis was also low. However, fetal loss occurred in 32% of the infected women. The difference in outcome between those receiving antenatal care and those without was significant (P = 0.01; RR 7.53 95% Cl 1.1 - 51.9). In 2002, > 90% of E. coli causing UTI was susceptible to nitrofurantoin, a relatively inexpensive and safe drug. However, less than 25% of doctors used it for treatment of cystitis. The choice and duration of therapy varied greatly.Resistance to ampicillin (pDiscussion: The prevalence of STIs among antenatal women is low. However, syphilis is an unrecognised cause of pregnancy loss in the area. There are several lacunae in the diagnosis and treatment of infections in pregnancy - both UTI and STIs. A major reason probably is the lack of locally relevant uniform guidelines for the diagnosis and management of these conditions. There is also complacency because of low prevalence of STIs in pregnancy. We also observed that auditing the management of syphilis in pregnancy could be an effective and simple tool to assess the quality of antenatal care. High prevalence of resistance among E coli is associated with integrons. Since CRP levels rise in babies without infection, this test may be useful only in excluding infection.List of scientific papersI. Alexander R, Mathai E, Nayyar V, Mathew M, Jasper P (1993). "Low prevalence of chlamydial endocervical infection in antenatal south Indian women." Genitourin Med 69(3): 240-1 https://pubmed.ncbi.nlm.nih.gov/8335319II. Mathai E, Mathai M, Prakash JA, Bergstrom S (2001). "Audit of management of pregnant women with positive VDRL tests." Natl Med J India 14(4): 202-4 https://pubmed.ncbi.nlm.nih.gov/11547524III. Mathai E, Thomas RJ, Chandy S, Mathai M, Bergstrom S (2004). "Antimicrobials for the treatment of urinary tract infection in pregnancy: practices in southern India. " Pharmacoepidemiol Drug Saf 13(9): 645-52 https://pubmed.ncbi.nlm.nih.gov/15362088IV. Mathai E, Grape M, Kronvall G (2004). "Integrons and multidrug resistance among Escherichia coli causing community-acquired urinary tract infection in southern India. " APMIS 112(3): 159-64 https://pubmed.ncbi.nlm.nih.gov/15153157V. Mathai E, Christopher U, Mathai M, Jana AK, Rose D, Bergstrom S (2004). "Is C-reactive protein level useful in differentiating infected from uninfected neonates among those at risk of infection? " Indian Pediatr 41(9): 895-900 https://pubmed.ncbi.nlm.nih.gov/15475630</p
Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at √s = 7 TeV
No full textThe prompt production of charmonium χ c and J / ψ states is studied in proton-proton collisions at a centre-of-mass energy of √s = 7 TeV at the Large Hadron Collider. The χ c and J / ψ mesons are identified through their decays χ c → J / ψ γ and J / ψ → μ + μ - using 36 pb - 1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for χ c and J / ψ, σ (χ c → J / ψ γ) / σ (J / ψ), is determined as a function of the J / ψ transverse momentum in the range 2 < p T J / ψ < 15 GeV / c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low p T J / ψ region
Progress in Understanding, Diagnosing, and Managing Cardiac Complications of Systemic Sclerosis
No full textPurpose of the Review: Systemic sclerosis (scleroderma) is a complex autoimmune disease that commonly involves the cardiovascular system. Even if often subclinical, cardiac involvement is considered a poor prognostic factor as it is a leading cause of death in scleroderma patients. We review the cardiac manifestations of scleroderma, the diagnostic methods useful in detection, and current advances in therapeutic management. Recent Findings: Beside the routine exams for the assessment of cardiac status (including EKG, standard echocardiography, provocative tests) novel techniques such as myocardial strain imaging on echocardiography, cardiac magnetic resonance imaging, invasive hemodynamic assessment, and endomyocardial biopsy have been demonstrated to be useful in understanding the cardiac alterations that typically affect scleroderma patients. Summary: Recent application of novel cardiac detection strategies is providing increased insight into the breadth and pathogenesis of cardiac complications of scleroderma. Further studies coupling exercise provocation, invasive and imaging assessment, and mechanistic studies in scleroderma cardiac tissue are needed to develop the optimal approach to early detection of cardiac disease in scleroderma and targeted therapies
The Folio: F. C. C. Magazine
No full textEditorial. pp. 1-2; Poetry-Belinda. pp. 3-4; Lall, J. S.-Article-On the Writing of History (Being a Review of the Book by Sir Charles Oman). pp. 5-7; Isaac, O. S.-Story-Retribution. pp. 7-9; Swaraj Malhotra-Travelogues-India Today. pp. 9-11; Knowledge Comes but Wisdom Lingers. pp. 12; Alexander, I.-What Shall I Write On? pp. 12-14; Basant Saigal-News and Notes. pp. 14-17; Bhatnagar, R. M.-Article-On Textual Criticism. pp. 18-19; Article-War Publicity by Students. pp. 19-21; Satya Paul Jaura-A Beauty Spot. pp. 21-23; Shanti Cameron-The Co-Eds' Corner. pp. 23-24; Sport. pp. 24; Shakespeare in India. pp. 25-27; Societies. pp. 27-28; Hostel News. pp. 29; W. P. B. pp. 30-31; [Hindi]. 8 p.; Punjabi Kiyari [Punjabi]. 10 p.; Folio [Urdu]. 16 p.Professor Mathai and Professor Manohar Ray. before page
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