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Maqbool K, Shaheen S, Mann AB. Exact solution of cilia induced flow of a Jeffrey fluid in an inclined tube. SPRINGERPLUS 2016; 5:1379. [PMID: 27610298 PMCID: PMC4993733 DOI: 10.1186/s40064-016-3021-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Accepted: 08/08/2016] [Indexed: 11/17/2022]
Abstract
The present study investigated the cilia induced flow of MHD Jeffrey fluid through an inclined tube. This study is carried out under the assumptions of long wavelength and low Reynolds number approximations. Exact solutions for the velocity profile, pressure rise, pressure gradient, volume flow rate and stream function are obtained. Effects of pertinent physical parameters on the computational results are presented graphically.
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Stella S, Li H, Stathogiannis K, Stojkovic S, Ondrus T, Plaza Lopez D, Jinno S, Verseckaite R, Oliveira Da Silva C, Altin C, Krestjyaninov MV, Izci S, Santos M, Urbano-Moral JA, Spartera M, Gonzalvez-Garcia A, Miskowiec D, Hagrass MUHAMMAD, Rady M, Reskovic Luksic V, Castaldi B, Silva T, Silva T, Silva T, Kolossvary M, Basuoni A, Miskowiec D, Peovska Mitevska I, Aguiar Rosa S, Rosa I, Marini C, Ancona F, Spagnolo P, Latib A, Romano V, Colombo A, Margonato A, Agricola E, Yuan L, Xie MX, Jin XY, Toutouzas K, Drakopoulou M, Latsios G, Synetos A, Sanidas E, Kaitozis O, Trantalis G, Gerckens U, Tousoulis D, Tesic M, Stojkovic S, Stepanovic J, Trifunovic D, Beleslin B, Giga V, Nedeljkovic I, Djordjevic Dikic A, Bartunek J, Vanderheyden M, Stockman B, Mirica C, Kotrc M, Van Praet F, Van Camp G, Penicka M, Igual Munoz B, Sanchez Lacuesta ME, Lopez Vilella R, Domenech Tort MD, Sepulveda Sanchis P, Ten Morro F, Calvillo Batlles P, Montero Argudo JA, Martinez Dolz LV, Yamada A, Sugimoto K, Ito S, Kato M, Inuzuka H, Sugiyama H, Takada K, Ozaki Y, Ishii J, Mizariene V, Gaileviciute K, Bieseviciene M, Jonkaitiene R, Jurkevicius R, Gunyeli E, Winter R, Back M, Settergren M, Manouras A, Shahgaldi K, Ozsoy HM, Gezmis E, Yilmaz M, Tunc E, Sade LE, Muderrisoglu H, Gimaev RH, Melnikova MA, Olezov NV, Ruzov VI, Dogan C, Acar R, Cetin G, Bakal RB, Unkun T, Cap M, Erdogan E, Kaymaz C, Ozdemir N, Leite L, Martins R, Baptista R, Barbosa A, Ribeiro N, Oliveira A, Castro G, Pego M, Gutierrez-Garcia-Moreno L, Rodriguez-Palomares JF, Galuppo V, Maldonado-Herrera G, Teixido-Tura G, Gruosso D, Gonzalez-Alujas T, Evangelista-Massip A, Stella S, Rosa I, Ancona F, Marini C, Latib A, Giannini F, Colombo A, Margonato A, Agricola E, Urbano-Moral JA, Matabuena-Gomez-Limon J, Grande-Trillo A, Rojas-Bermudez C, Rodriguez-Puras MJ, Martinez-Martinez A, Lopez-Pardo F, Lopez-Haldon JE, Kupczynska K, Kasprzak JD, Lipiec P, Abdelrahman Sharaf El Dein AHMED, Shawky El Serafy AHMED, Rajan RAJESH, Sveric K, Kvakan H, Strasser RH, Cekovic S, Veceric S, Separovic Hanzevacki J, Romanato S, Callegari A, Bernardinello V, Reffo E, Milanesi O, Agapito A, Sousa L, Oliveira JA, Branco LM, Timoteo AT, Galrinho A, Thomas B, Tavares NJ, Cruz Ferreira R, Agapito A, Sousa L, Oliveira JA, Branco LM, Timoteo AT, Galrinho A, Thomas B, Tavares NJ, Cruz Ferreira R, Agapito A, Sousa L, Oliveira JA, Soares R, Aguiar Rosa SA, Morais L, Thomas B, Tavares NJ, Cruz Ferreira R, Szilveszter B, Elzomor H, Karolyi M, Raaijmakers R, Benke K, Celeng C, Bagyura Z, Merkely B, Maurovich-Horvat P, Shaheen S, Abdelkader M, Rasheed T, Kasprzak JD, Lipiec P, Srbinovska E, Pop Gorceva D, Zdravkovska M, Galrinho A, Moura Branco L, Timoteo AT, Agapito A, Sousa L, Oliveira JA, Rodrigues I, Viveiros Monteiro A, Cruz Ferreira R. HIT Poster session 3Transcatheter procedures (TAVI/MitralClip)P937Comparison between 3d transesophageal echocardiography and multislice computed tomography for the aortic annulus sizing in tavi patients: implication for prosthesis sizingP938Left ventricular remodelling in chronic mitral regurgitation: from geometry to mechanics by speckle tracing imageP939Direct TAVI of a self-expanding bioprosthesis: long-term clinical outcomes.P940Prognostic value of coronary flow reserve in the culprit artery following previous myocardial infarctionP941Both MitraClip and heartport surgery prevent progressive left ventricular remodeling in very severe systolic heart failureP942Predictors for the development of microvascular obstruction in patients with acute myocardial infarction treated with primary percutaneous coronary intervention.P943Usefulness of exercise stress echocardiography in asymptomatic or mildly symptomatic patients with chronic degenerative mitral regurgitationP944Left ventricular myocardial deformation changes after aortic valve repair and replacement for aortic regurgitationP945Transcatheter aortic valve implantation: a view of the right side.P946Assessment of epicardial fat thickness and carotid intima media thickness in preeclemsiaP947Gender differences in the remodelling of left and right chambers of the heart in patients with uncontrolled hypertensionP948The five-year course of the left ventricular conventional and advanced echocardiographic parameters in patients with anterior and inferior myocardial infarction revascularized by percutaneouslyP949Aortic regurgitation and 2D derived-speckle tracking left ventricle global longitudinal strain: a connection with symptoms beyond ejection fractionP950Hypertrophic cardiomyopathy: structural abnormalities beyond hypertrophy from a prospective echocardiographic evaluationP952Echocardiographic findings of thrombosis vs endocarditis in tavi patients: a single centre experienceP953Prospective examination of the prevalence and significance of causal mechanisms of low gradient aortic valve stenosisP954Echocardiographic assessment of regional left atrial longitudinal strain by tissue Doppler and speckle tracking method - a comparison studyP955Pattern of atherosclerosis in extracranial and intracranial vessles in non diabetic, non stroke patient with atherosclerotic CADP9563D volume time curves of the left ventricle and exercise capacity testing in patients with dilated cardiomyopathy- old parameters revisedP957Left ventricular longitudinal function in hypertensive patients with septal bulgeP958Integrated imaging to evaluate cardiac performance in Fontan patientsP959The value of right ventricular global longitudinal strain in the evaluation of adult patients with repaired tetralogy of FallotP960Accurate transthoracic echocardiography parameters for the evaluation of adult patients with repaired tetralogy of Fallot: validation with cardiac magnetic resonance imagingP961Cardiac magnetic resonance imaging and cardiopulmonary exercise testing in the functional evaluation of adult patients with repaired tetralogy of FallotP962Model based iterative reconstruction techniques cause modest change in calcium scoresP963Assesment of diastolic heart function by using multi detector computed tomography ( MDCT) in comparison with tissue dopplerP964Bicuspid aortic valve morphology and its impact on aortic diameter - a meta-analysisP965Prognostic value of moderate and severe myocardial ischemia in patients with suspected coronary artery disease and normal coronary angiogramsP966Predictors of aortic dilation in patients with bicuspid aortic valve. Eur Heart J Cardiovasc Imaging 2015. [DOI: 10.1093/ehjci/jev274] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Ashfaq M, Najam T, Shah SSA, Ahmad MM, Shaheen S, Tabassum R, Rivera G. DNA binding mode of transition metal complexes, a relationship to tumor cell toxicity. Curr Med Chem 2015; 21:3081-94. [PMID: 24934346 DOI: 10.2174/0929867321666140601201803] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Revised: 04/01/2014] [Accepted: 05/26/2014] [Indexed: 11/22/2022]
Abstract
Transition metal-based compounds constitute a distinct class of chemotherapeutics extensively used in the clinic as antitumor and antiviral agents. However, drug resistance and side effects of established antitumor metallodrugs such as cisplatin [cis-diamminedichloroplatinum(II)] and its analogues, carboplatin and oxaliplatin, have limited their clinical utility. These limitations have prompted a search for more effective and less toxic metal-based antitumor agents. The unique properties of metal ions, such as redox transfer/electron shuttling, and versatile coordination geometries arising from various oxidation states, result in metal ions and complexes that have potential medicinal applications that could be complementary to organic compounds and which are widely sought in drug discovery efforts. This review summarizes the results that show that transition metal complexes exhibit antitumor effects that differ from cisplatin or its analogues.
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Greenblatt JB, Shaheen S. Automated Vehicles, On-Demand Mobility, and Environmental Impacts. ACTA ACUST UNITED AC 2015. [DOI: 10.1007/s40518-015-0038-5] [Citation(s) in RCA: 128] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Allinson J, Hardy R, Donaldson G, Shaheen S, Kuh D, Wedzicha J. P13 The Overlapping Prevalence Of Chronic Mucus Hypersecretion (cmh) And Chronic Cough (cc). Thorax 2014. [DOI: 10.1136/thoraxjnl-2014-206260.163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Abstract
This article presents an overview of mycetoma and offers guidelines for orthopaedic surgeons who may be involved in the care of patients with this condition.
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Shaheen S, Martin E, Cohen A. Public Bikesharing and Modal Shift Behavior: A Comparative Study of Early Bikesharing Systems in North America. ACTA ACUST UNITED AC 2013. [DOI: 10.14257/ijt.2013.1.1.03] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Pervaiz S, Shaheen T, Shaheen S, Dar N, Samra Z. Purification, characterization and preparation immunomatrixes of S-layer proteins of Thermobifida fusca. J Appl Microbiol 2013; 115:735-43. [DOI: 10.1111/jam.12259] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Revised: 05/14/2013] [Accepted: 05/18/2013] [Indexed: 11/27/2022]
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Shaheen S, Akita H, Souichirou I, Miura N, Harashima H. Abstract P4-04-08: A Potential non-viral vector to transfect dendritic cell and thereby MHC-Class I antigen presentation might be a potential use in carcinoma. Cancer Res 2012. [DOI: 10.1158/0008-5472.sabcs12-p4-04-08] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
To date almost no remarkable potential non-viral vector was developed to transfect promisingly primary dendritic cell like Bone Marrow Derived Dendritic Cell (BMDC) so that it might generate antigen presentation while epitopic-plasmid was delivered. Here we have introduced a potential non-viral vector named Stearyl-KALA MEND (100–130 nm, zeta potential 35–40 mV), which expressed to date the highest transgene expression while firefly luciferase was introduced (sub-cloned), and thereby promising antigen presentation in vitro while OVA plasmid containing MHC Class-I restricted SIINFEKL epitope was introduced and co-cultured with B3Z T-cell hybridoma. On the basis of these results, we used this vector to transfect BMDC and harvested the DC to chase the corresponding EG7-OVA induced tumor ex vivo. Later we further immunized mice directly with STR-KALA MEND containing OVA plasmid and challenged against the tumor (EG7-OVA induced). In this in vivo study we found also a significant antitumor activity. To evaluate the promptness of our vector we further sub-cloned Mart-1 gene, in our sub-cloned plasmid vector and immunized the mice as before. Thereafter inserting B16F10 melanoma cells to the immunized mice we found also a significant antitumor activity after 24 days of inoculation. Thus the vector, STR-KALA MEND might be a future potential use as DNA vaccine in anti-tumor methodology.
Citation Information: Cancer Res 2012;72(24 Suppl):Abstract nr P4-04-08.
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Bakolis I, Hooper R, Burney P, Shaheen S. P1-8 Principal components analysis of diet is not good at identifying foods that are causally linked to disease: a simulation study. Br J Soc Med 2011. [DOI: 10.1136/jech.2011.142976c.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Burney P, Potts J, Makowska J, Kowalski M, Phillips J, Gnatiuc L, Shaheen S, Joos G, Van Cauwenberge P, van Zele T, Verbruggen K, van Durme Y, Derudder I, Wohrl S, Godnic-Cvar J, Salameh B, Skadhauge L, Thomsen G, Zuberbier T, Bergmann KC, Heinzerling L, Renz H, Al-Fakhri N, Kosche B, Hildenberg A, Papadopoulos NG, Xepapadaki P, Zannikos K, Gjomarkaj M, Bruno A, Pace E, Bonini S, Bresciani M, Gramiccioni C, Fokkens W, Weersink EJM, Carlsen KH, Bakkeheim E, Loureiro C, Villanueva CM, Sanjuas C, Zock JP, Lundback B, Janson C. A case-control study of the relation between plasma selenium and asthma in European populations: a GAL2EN project. Allergy 2008; 63:865-71. [PMID: 18588552 DOI: 10.1111/j.1398-9995.2008.01716.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND There is evidence that selenium levels are relatively low in Europe and may be falling. Low levels of selenium or low activity of some of the enzymes dependent on selenium have been associated with asthma. METHODS The GA(2)LEN network has organized a multicentre case-control study in Europe to assess the relation of plasma selenium to asthma. The network compared 569 cases in 14 European centres with a diagnosis of asthma and reporting asthma symptoms in the last 12 months with 576 controls from the same centres with no diagnosis of asthma and no asthmatic symptoms in the last 12 months. RESULTS All cases and controls were selected from the same population defined by age and place of residence. Mean plasma selenium concentrations among the controls ranged from 116.3 microg/l in Palermo to 67.7 microg/l in Vienna and 56.1 microg/l among the children in Oslo. Random effects meta-analysis of the results from the centres showed no overall association between asthma and plasma selenium [odds ratio (OR)/10 microg/l increase in plasma selenium: 1.04; 95% confidence interval (CI): 0.89-1.21] though there was a significantly protective effect in Lodz (OR: 0.48; 95% CI: 0.29-0.78) and a marginally significant adverse effect in Amsterdam (OR: 1.68; 95% CI: 0.98-2.90) and Ghent (OR: 1.35; 95% CI: 1.03-1.77). CONCLUSION This study does not support a role for selenium in protection against asthma, but effect modification and confounding cannot be ruled out.
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Shaheen S, Potts J, Gnatiuc L, Makowska J, Kowalski ML, Joos G, van Zele T, van Durme Y, De Rudder I, Wöhrl S, Godnic-Cvar J, Skadhauge L, Thomsen G, Zuberbier T, Bergmann KC, Heinzerling L, Gjomarkaj M, Bruno A, Pace E, Bonini S, Fokkens W, Weersink EJM, Loureiro C, Todo-Bom A, Villanueva CM, Sanjuas C, Zock JP, Janson C, Burney P. The relation between paracetamol use and asthma: a GA2LEN European case-control study. Eur Respir J 2008; 32:1231-6. [PMID: 18579547 DOI: 10.1183/09031936.00039208] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Studies from the UK and USA suggest that frequent use of paracetamol (acetaminophen) may increase the risk of asthma, but data across Europe are lacking. As part of a multicentric case-control study organised by the Global Allergy and Asthma European Network (GA(2)LEN), it was examined whether or not frequent paracetamol use is associated with adult asthma across Europe. The network compared 521 cases with a diagnosis of asthma and reporting of asthma symptoms within the last 12 months with 507 controls with no diagnosis of asthma and no asthmatic symptoms within the last 12 months across 12 European centres. All cases and controls were selected from the same population, defined by age (20-45 yrs) and place of residence. In a random effects meta-analysis, weekly use of paracetamol, compared with less frequent use, was strongly positively associated with asthma after controlling for confounders. There was no evidence for heterogeneity across centres. No association was seen between use of other analgesics and asthma. These data add to the increasing and consistent epidemiological evidence implicating frequent paracetamol use in asthma in diverse populations.
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Shaheen S, Potts J, Gnatiuc L, Makowska J, Kowalski ML, Joos G, van Zele T, van Durme Y, De Rudder I, Wöhrl S, Godnic-Cvar J, Skadhauge L, Thomsen G, Zuberbier T, Bergmann KC, Heinzerling L, Gjomarkaj M, Bruno A, Pace E, Bonini S, Fokkens W, Weersink EJM, Loureiro C, Todo-Bom A, Villanueva CM, Sanjuas C, Zock JP, Janson C, Burney P. The relation between paracetamol use and asthma: a GA2LEN European case-control study. Eur Respir J 2008. [PMID: 18579547 DOI: 10.1183/09031936.00039208.] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Studies from the UK and USA suggest that frequent use of paracetamol (acetaminophen) may increase the risk of asthma, but data across Europe are lacking. As part of a multicentric case-control study organised by the Global Allergy and Asthma European Network (GA(2)LEN), it was examined whether or not frequent paracetamol use is associated with adult asthma across Europe. The network compared 521 cases with a diagnosis of asthma and reporting of asthma symptoms within the last 12 months with 507 controls with no diagnosis of asthma and no asthmatic symptoms within the last 12 months across 12 European centres. All cases and controls were selected from the same population, defined by age (20-45 yrs) and place of residence. In a random effects meta-analysis, weekly use of paracetamol, compared with less frequent use, was strongly positively associated with asthma after controlling for confounders. There was no evidence for heterogeneity across centres. No association was seen between use of other analgesics and asthma. These data add to the increasing and consistent epidemiological evidence implicating frequent paracetamol use in asthma in diverse populations.
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Nyagol J, De Falco G, Lazzi S, Luzzi A, Cerino G, Shaheen S, Palummo N, Bellan C, Spina D, Leoncini L. HIV-1 Tat mimetic of VEGF correlates with increased microvessels density in AIDS-related diffuse large B-cell and Burkitt lymphomas. J Hematop 2008; 1:3-10. [PMID: 19669199 PMCID: PMC2712328 DOI: 10.1007/s12308-008-0002-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2007] [Accepted: 02/19/2008] [Indexed: 01/16/2023] Open
Abstract
Angiogenic switch marks the beginning of tumor’s strategy to acquire independent blood supply. In some subtypes of non-Hodgkin’s lymphomas, higher local vascular endothelial growth factor (VEGF) expression correlates with increased microvessel density. However, this local VEGF expression is higher only in tumors with elevated expression of the receptors of the growth factor, suggesting an autocrine growth-promoting feedback loop. Several studies have indicated that VEGF receptors are also targeted by Tat protein from the HIV-1-infected cells. Given the similarity of the basic region of Tat to the angiogenic factors (basic fibroblast growth factor, VEGF), Tat mimics these proteins and binds to their receptors. We evaluated the role of HIV-1 Tat in regulating the level of VEGF expression and microvessel density in the AIDS-related diffuse large B-cell (DLBCL) and Burkitt lymphomas (BL). By luciferase assay, we showed that VEGF promoter activity was downregulated in vitro in cells transfected with Tat. Reduced VEGF protein expression in primary HIV-1 positive BL and DLBCL, compared to the negative cases, supported the findings of promoter downregulation from the cell lines. Microvascular density assessed by CD34 expression was, however, higher in HIV-1 positive than in HIV-1 negative tumors. These results suggest that Tat has a wider angiogenic role, besides the regulation of VEGF expression. Thus, targeting Tat protein itself and stabilizing transient silencing of VEGF expression or use of monoclonal antibodies against their receptors in the AIDS-associated tumors will open a window for future explorable pathways in the management of angiogenic phenotypes in the AIDS-associated non-Hodgkin’s lymphomas.
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Talukder MH, Jabeen S, Shaheen S, Islam MJ, Haque M. Pattern of cancer in young adults at National Institute of Cancer Research and Hospital (NICRH), Bangladesh. Mymensingh Med J 2007; 16:S28-S33. [PMID: 17917627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
This is an analysis of 1624 young adults (20-44 years) new cancer patients who attended Out Patient Department of NICRH in 2005 from 01 January to 31 December. This study was carried out to know the age and sex distribution and types of cancer they are suffering from. Histologiacally or cytologically confirmed patients or those patients having radiological or clinical evidence of malignancy were included in the study. There were 42.9% male and 57.1% female with male to female ratio of 0.75: 1.00. Female populations of this age group were the most cancer sufferers. Mean age of young adults was 34.47 (SD+/-6.33) years. Muslims (93.4%) were in majority and 36.5% were illiterate. This study revealed that the top five cancers found in both sexes were breast cancer (19.2%), female genital organ cancer (17.7%), GIT cancer (13.5%), head & neck cancer (12.2%) and respiratory tract cancer (7.9%). Breast cancer and GIT cancer ranked top among females and males respectively.
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Tricon S, Willers S, Smit HA, Burney PG, Devereux G, Frew AJ, Halken S, Host A, Nelson M, Shaheen S, Warner JO, Calder PC. Nutrition and allergic disease. ACTA ACUST UNITED AC 2006. [DOI: 10.1111/j.1365-2222.2006.00114.x] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Voytas PA, Ternovan C, Galeazzi M, McCammon D, Kolata JJ, Santi P, Peterson D, Guimarães V, Becchetti FD, Lee MY, O'Donnell TW, Roberts DA, Shaheen S. Direct measurement of the L/K ratio in (7)Be electron capture. PHYSICAL REVIEW LETTERS 2002; 88:012501. [PMID: 11800939 DOI: 10.1103/physrevlett.88.012501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2001] [Indexed: 05/23/2023]
Abstract
The ratio of L- to K-shell electron captures in light nuclei is particularly sensitive to electron overlap and exchange effects. Calculations of these effects in (7)Be disagree by more than 20%. We report a measurement of the L/K ratio in (7)Be, using a cryogenic microcalorimeter which clearly separates L- and K-shell captures. The obtained L/K ratio of 0.040(6) is less than half that of existing predictions for free (7)Be. The discrepancy is likely due to in-medium effects distorting the L-shell electron orbitals.
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Shaheen S. Shots in the desert and Gulf war syndrome. Evidence that multiple vaccinations during deployment are to blame is inconclusive. BMJ (CLINICAL RESEARCH ED.) 2000; 320:1351-2. [PMID: 10818005 PMCID: PMC1118030 DOI: 10.1136/bmj.320.7246.1351] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Gad EF, Atiya AF, Shaheen S, el-Dessouki A. A new algorithm for learning in piecewise-linear neural networks. Neural Netw 2000; 13:485-505. [PMID: 10946395 DOI: 10.1016/s0893-6080(00)00024-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Piecewise-linear (PWL) neural networks are widely known for their amenability to digital implementation. This paper presents a new algorithm for learning in PWL networks consisting of a single hidden layer. The approach adopted is based upon constructing a continuous PWL error function and developing an efficient algorithm to minimize it. The algorithm consists of two basic stages in searching the weight space. The first stage of the optimization algorithm is used to locate a point in the weight space representing the intersection of N linearly independent hyperplanes, with N being the number of weights in the network. The second stage is then called to use this point as a starting point in order to continue searching by moving along the single-dimension boundaries between the different linear regions of the error function, hopping from one point (representing the intersection of N hyperplanes) to another. The proposed algorithm exhibits significantly accelerated convergence, as compared to standard algorithms such as back-propagation and improved versions of it, such as the conjugate gradient algorithm. In addition, it has the distinct advantage that there are no parameters to adjust, and therefore there is no time-consuming parameters tuning step. The new algorithm is expected to find applications in function approximation, time series prediction and binary classification problems.
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Khalil H, Atiya AF, Shaheen S. Three-dimensional video compression using subband/wavelet transform with lower buffering requirements. IEEE TRANSACTIONS ON IMAGE PROCESSING : A PUBLICATION OF THE IEEE SIGNAL PROCESSING SOCIETY 1999; 8:762-773. [PMID: 18267491 DOI: 10.1109/83.766855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Three-dimensional (3-D) video compression using wavelets decomposition along the temporal axis dictates that a number of video frames must be buffered to allow for the temporal decomposition. Buffering of frames allows for the temporal correlation to be made use of, and the larger the buffer the more effective the decomposition. One problem inherent in such a set up in interactive applications such as video conferencing, is that buffering translates into a corresponding time delay. We show that 3-D coding of such image sequences can be achieved in the true sense of temporal direction decomposition but with much less buffering requirements. For a practical coder, this can be achieved by introducing an approximation to the way the transform coefficients are encoded. Applying wavelet decomposition using some types of filters may introduce edge errors, which become more prominent in short signal segments. We also present a solution to this problem for the Daubechies (1988) family of filters.
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Anderson JD, McDonald EM, Lee PA, Anderson ML, Ritchie EL, Hall HK, Hopkins T, Mash EA, Wang J, Padias A, Thayumanavan S, Barlow S, Marder SR, Jabbour GE, Shaheen S, Kippelen B, Peyghambarian N, Wightman RM, Armstrong NR. Electrochemistry and Electrogenerated Chemiluminescence Processes of the Components of Aluminum Quinolate/Triarylamine, and Related Organic Light-Emitting Diodes. J Am Chem Soc 1998. [DOI: 10.1021/ja980707+] [Citation(s) in RCA: 182] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
Recent follow-up studies have provided convincing evidence that the foundations of chronic airflow obstruction (CAO) are laid in utero and early childhood. Men born in Hertfordshire and Derbyshire, England, were more likely to have impaired lung function at 60-70 years of age if they had been lighter at birth and if they had had lower respiratory tract infection (LRTI) in the first 2 years of life. Furthermore, they were more likely to have died from chronic obstructive pulmonary disease if they had been lighter at 1 year of age. These findings suggest that impairment of pulmonary growth in utero and early childhood, as a consequence of undernutrition and LRTI, plays an important part in the development of CAO in late adult life. This may be of particular importance for the future respiratory health of developing nations as the additive effects of smoking take hold.
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Naqvi A, Nagadi M, Shaheen S, Bari A. Energy resolution measurements of benzene, toluene and cyclohexane scintillators for monoenergetic γ-rays. Appl Radiat Isot 1996. [DOI: 10.1016/0969-8043(95)00261-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Roberts DA, Ashktorab K, Becchetti FD, Jänecke J, Harakeh MN, Berg GP, Foster CC, Lisantti JE, Rinckel T, Stephenson EJ, Wells SP, Nadasen A, Shaheen S. Neutron decay from the isobaric analog state in 120Sb populated in 120Sn(3He,t)120Sb at E(3He) = 200 MeV, theta = 0 degrees. PHYSICAL REVIEW. C, NUCLEAR PHYSICS 1995; 52:1361-1367. [PMID: 9970641 DOI: 10.1103/physrevc.52.1361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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