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1. Progression of liver fibrosis following acute hepatitis C virus infection in HIV-positive MSM

Author

Newsum, A.M., Kooij, K.W., Boyd, A., Smit, C., Wit, F.W.N.M., Meer, J.T.M. van der, Prins, M., Reiss, P., Valk, M. van der, Eden, H. van, Molenkamp, R., Pijnappel, F., Reesink, H.W., Schinkel, J., Steba, G.S., Berk, G.E.L. van den, Brinkman, K., Hooijenga, I., Kwa, D., Meche, N. van der, Toonen, A., Vos, D., Broekhuizen, M. van, Lauw, E.N., Mulder, J.W., Arend, J.E., Kessel, A. van, Silvius, B., Versloot, M., Boonstra, A., Rijnders, B.J.A., Brokking, W., Eeden, A. van, Elsenburg, L., Nobel, H.E., Laar, T.J.W. van de, Veldt, W. van der, Geerlings, S.E., Goorhuis, A., Hovius, J.W., Lempkes, B., Nellen, F.J.B., Poll, T. van der, Prins, J.M., Vugt, M. van, Wiersinga, W.J., Duinen, M. van, Eden, J. van, Hazenberg, A., Hes, A.M.H. van, Pijnappel, F.J.J., Smalhout, S.Y., Weijsenfeld, A.M., Jurriaans, S., Back, N.K.T., Zaaijer, H.L., Berkhout, B., Cornelissen, M.T.E., Schinkel, C.J., Wolthers, K.C., Peters, E.J.G., Agtmael, M.A. van, Bomers, M., Sigaloff, K.C.E., Heitmuller, M., Laan, L.M., Ang, C.W., Houdt, R. van, Jonges, M., Pettersson, A.M., Prehn, J. van, Berge, M. van den, Stegeman, A., Baas, S., Looff, L.H. de, Wintermans, B., Veenemans, J., Pronk, M.J.H., Ammerloan, H.S.M., Munnik, E.S. de, Jansz, A.R., Tjhie, J., Wegdam, M.C.A., Deiman, B., Scharnhorst, V., Elsenburg, L.J.M., Nobel, H., Damen, M., Kasteren, M.E.E. van, Berrevoets, M.A.H., Brouwer, A.E., Adams, A., Kruijf-van de Wiel, B.A.E. de, Keelan-Pfaf, S., Ven, B. van de, Ven, B. van der, Buiting, A.G.M., Murck, J.L., Versteeg, D., Ende, M.E. van der, Box, H.I., Gorp, E.C.M. van, Nouwen, J.L., Schurink, C.A.M., Verbon, A., Vries-Sluijs, T.E.M.S. de, Jong-Peltenburg, N.C. de, Bassant, N., Beek, J.E.A. van, Vriesde, M., Zonneveld, L.M. van, Berg-Cameron, H.J. van den, Groot, J. de, Boucher, C.A.B., Koopmans, M.P.G., Kampen, J.J.A. van, Branger, J., Douma, R.A., Duijf-van de Ven, C.J.H.M., Schippers, E.F., Nieuwkoop, C. van, IJperen, J.M. van, Geilings, J., Hut, G. van der, Burgel, N.D. van, Leyten, E.M.S., Gelinck, L.B.S., Mollema, F., Davids-Veldhuis, S., Hartingsveld, A.Y. van, Wildenbeest, G.S., Heikens, E., Groeneveld, P.H.P., Bouwhuis, J.W., Lammers, A.J.J., Kraan, S., Hulzen, A.G.W. van, Kruiper, M.S.M., Bliek, G.L. van der, Bor, P.C.J., Bloembergen, P., Wolthagen, M.H.M., Ruijs, G.J.H.M., Kroon, E., Boer, M.G.J. de, Scheper, H., Jolink, H., Dorama, W., Holten, N. van, Claas, E.C.J., Wessels, E., Hollander, J.G. den, Pogany, K., Roukens, A., Douma, R., Kastelijns, M., Smit, J.V., Smit, E., Struik-Kalkman, D., Tearno, C., Niekerk, T. van, Pontesilli, O., Lowe, S.H., Lashof, A.M.L.O., Posthouwer, D., Ackens, R.P., Burgers, K., Schippers, J., Enberg-Maes, B.W., Loo, I.H.M. van, Havenith, T.R.A., Vrouenraets, S.M.E., Broekhuizen, M.C. van, Vlasblom, D.J., Kroeze, M., Smits, P.H.M., Weijer, S., Moussaoui, R. el, Bosma, A.S., Vonderen, M.G.A. van, Kampschreur, L.M., Faber, S., Steeman-Bouma, R., Wed, J., Kootstra, G.J., Delsing, C.E., Burg-van de Plas, M. van der, Heins, H., Kortmann, W., Twillert, G. van, Renckens, R., Ruiter-Pronk, D., Truijen-Oud, E.A. van, Stuart, J.W.T.C., Jansen, E.R., Hoogewerf, M., Rozemeijer, W., Reijden, W.A. van der, Sinnige, J.C., Blok, W.L., Frissen, P.H.J., Lettinga, K.D., Schouten, W.E.M., Veenstra, J., Brouwer, C.J., Geerders, G.E., Hoeksema, K., Kleene, M.J., Knapen, M., Meche, I.B. van der, Mulder-Seeleman, E., Toonen, A.J.M., Wijnands, S., Crevel, R. van, Dofferhoff, A.S.M., Hofstede, H.J.M. ter, Hoogerwerf, J., Keuter, M., Richel, O., Albers, M., Grintjes-Huisman, K.J.T., Haan, M. de, Marneef, M., Strik-Albers, R., Rahamat-Langendoen, J., Stelma, E.E., Burger, D., Gisolf, E.H., Hassing, R.J., Claassen, M., Beest, G. ter, Bentum, P.H.M. van, Langebeek, N., Tiemessen, R., Swanink, C.M.A., Lelyveld, S.F.L. van, Soetekouw, R., Prijt, L.M.M. van der, Swaluw, J. van der, Bermon, N., Jansen, R., Herpers, B.L., Veenendaal, D., Verhagen, D.W.M., Wijk, M. van, Bierman, W.F.W., Bakker, M., Kleinnij, APH - Global Health, AII - Infectious diseases, Graduate School, Infectious diseases, APH - Aging & Later Life, Global Health, APH - Methodology, APH - Digital Health, APH - Personalized Medicine, Gastroenterology & Hepatology, Internal Medicine, Virology, Medical Microbiology & Infectious Diseases, Med Microbiol, Infect Dis & Infect Prev, MUMC+: DA MMI Staf (9), RS: CAPHRI - R4 - Health Inequities and Societal Participation, MUMC+: TPZ Verpleegkundig Team Infectieziekten (9), MUMC+: DA MMI Infectieserologie (9), MUMC+: DA MMI AIOS (9), MUMC+: DA KFT Medische Staf (9), Anatomy and neurosciences, Amsterdam Movement Sciences - Rehabilitation & Development, Internal medicine, and Microbes in Health and Disease (MHD)

Subjects
Liver Cirrhosis, Male, 0301 basic medicine, HIV Infections, Disease, DISEASE, 0302 clinical medicine, ANTIRETROVIRAL THERAPY, STAGE, Interquartile range, HEPATOCELLULAR-CARCINOMA, Immunology and Allergy, 030212 general & internal medicine, Immunodeficiency, Netherlands, liver fibrosis, RISK, education.field_of_study, IMMUNODEFICIENCY, Coinfection, HIV/hepatitis C virus coinfection, MEN, Hepatitis C, Markov Chains, Infectious Diseases, Hepatocellular carcinoma, Disease Progression, SEX, Adult, medicine.medical_specialty, Population, Immunology, acute hepatitis C virus infection, 03 medical and health sciences, SDG 3 - Good Health and Well-being, Internal medicine, medicine, Humans, MSM, Homosexuality, Male, education, Retrospective Studies, Hepatitis, business.industry, fibrosis-4, Retrospective cohort study, NONINVASIVE INDEX, medicine.disease, Confidence interval, INDIVIDUALS, 030104 developmental biology, business
Abstract

Background: Whether continued, accelerated liver fibrosis progression occurs following acute hepatitis C virus infection (AHCVI) in HIV-positive MSM is unknown.Design and methods: HIV-positive MSM from the AIDS Therapy Evaluation in the Netherlands and MSM Observational Study for Acute Infection with Hepatitis C-cohorts with primary AHCVI and at least one fibrosis-4 (FIB-4) measurement less than 2 years before and 1 year after estimated AHCVI were included. Mixed-effect linear models were used to evaluate (time-updated) determinants of FIB-4 levels over time. Determinants of transitioning to and from FIB-4 1.45 were examined using multistate Markov models.Results: Of 313 MSM, median FIB-4 measurements per individual was 12 (interquartile range = 8-18) and median follow-up following AHCVI was 3.5 years (interquartile range = 1.9-5.6). FIB-4 measurements averaged at 1.00 [95% confidence interval (CI) = 0.95-1.05] before AHCVI, 1.31 (95% CI = 1.25-1.38) during the first year of AHCVI and 1.10 (95% CI = 1.05-1.15) more than 1 year after AHCVI. Mean FIB-4 more than 1 year after AHCVI was higher for chronically infected patients compared with those successfully treated (P = 0.007). Overall FIB-4 scores were significantly higher with older age, lower CD4(+) cell count, longer duration from HIV-diagnosis or AHCVI, and nonresponse to HCV-treatment. At the end of follow-up, 60 (19.2%) and eight MSM (2.6%) had FIB-4 between 1.45-3.25 and >= 3.25, respectively. Older age, lower CD4(+) cell count and detectable HIV-RNA were significantly associated with higher rates of progression to FIB-4 > 1.45, whereas older age, longer duration from HIV-diagnosis and nonresponse to HCV-treatment were significantly associated with lower rates of regression to FIB-4Conclusion: In this population of HIV-positive MSM, FIB-4 scores were higher during the first year of AHCVI, but FIB-4 >= 3.25 was uncommon by the end of follow-up. Well controlled HIV-infection appears to attenuate FIB-4 progression. Copyright (C) 2019 Wolters Kluwer Health, Inc. All rights reserved.

Published
2019

2. Predictive Performance of Cardiovascular Disease Risk Prediction Algorithms in People Living With HIV

Author

Zoest, R.A. van, Law, M., Sabin, C.A., Vaartjes, I., Valk, M. van der, Arends, J.E., Reiss, P., Wit, F.W., Geerlings, S.E., Godfried, M.H., Goorhuis, A., Hovius, J.W., Kuijpers, T.W., Nellen, F.J.B., Poll, D.T. van der, Prins, J.M., Vugt, H.J.M. van, Wiersinga, W.J., Wit, F.W.M.N., Duinen, M. van, Eden, J. van, Hes, A.M.H. van, Pijnappel, F.J.J., Weijsenfeld, A.M., Jurriaans, S., Back, N.K.T., Zaaijer, H.L., Berkhout, B., Cornelissen, M.T.E., Schinkel, C.J., Wolthers, K.C., Peters, E.J.G., Agtmael, M.A. van, Bomers, M., Heitmuller, M., Laan, L.M., Ang, C.W., Houdt, R. van, Pettersson, A.M., Vandenbroucke-Grauls, C.M.J.E., Berge, M. van den, Stegeman, A., Baas, S., Looff, L.H. de, Wintermans, B., Veenemans, J., Pronk, M.J.H., Ammerlaan, H.S.M., Munnik, E.S. de, Jansz, A.R., Tjhie, J., Wegdam, M.C.A., Deiman, B., Scharnhorst, V., Eeden, A. van, Brokking, W., Groot, M., Elsenburg, L.J.M., Damen, M., Kwa, I.S., Kasteren, M.E.E. van, Brouwer, A.E., Erve, R. van, Kruijf-van de Wiel, B.A.F.M. de, Ven, B. van de, Buiting, A.G.M., Kabel, P.J., Versteeg, D., Ende, M.E. van der, Bax, H.I., Gorp, E.C.M. van, Nouwen, J.L., Rijnders, B.J.A., Schurink, C.A.M., Verbon, A., Vries-Sluijs, T.E.M.S. de, Jong-Peltenburg, N.C. de, Bassant, N., Beek, J.E.A. van, Vriesde, M., Zonneveld, L.M. van, Berg-Cameron, H.J. van den, Groot, J. de, Zeeuw-de Man, M. de, Boucher, C.A.B., Koopmans, M.P.G., Kampen, J.J.A. van, Pas, S.D., Branger, J., Douma, R.A., Duijf-van de Ven, C.J.H.M., Schippers, E.F., Nieuwkoop, C. van, IJperen, J.M. van, Geilings, J., Hut, G. van der, Burgel, N.D. van, Leyten, E.M.S., Gelinck, L.B.S., Davids-Veldhuis, S., Hartingsveld, A.Y. van, Meerkerk, C., Wildenbeest, G.S., Heikens, E., Groeneveld, P.H.P., Bouwhuis, J.W., Lammers, A.J.J., Kraan, S., Hulzen, A.G.W. van, Kruiper, M.S.M., Bliek, G.L. van der, Bor, P.C.J., Bloembergen, P., Wolfhagen, M.J.H.M., Ruijs, G.J.H.M., Kroon, F.P., Boer, M.G.J. de, Scheper, H., Jolink, H., Dorama, W., Holten, N. van, Claas, E.C.J., Wessels, E., Hollander, J.G. den, Pogany, K., Roukens, A., Kastelijns, M., Smit, J.V., Smit, E., Struik-Kalkman, D., Tearno, C., Niekerk, T. van, Pontesilli, O., Lowe, S.H., Lashof, A.M.L.O., Posthouwer, D., Ackens, R.P., Burgers, K., Schippers, J., Weijenberg-Maes, B., Loo, I.H.M. van, Havenith, T.R.A., Mulder, J.W., Vrouenraets, S.M.E., Lauw, F.N., Broekhuizen, M.C. van, Vlasblom, D.J., Smits, P.H.M., Weijer, S., Moussaoui, R. el, Bosma, A.S., Vonderen, M.G.A. van, Kampschreur, L.M., Dijkstra, K., Faber, S., Weel, J., Kootstra, G.J., Delsing, C.E., Burg-van de Plas, M. van der, Heins, H., Kortmann, W., Twillert, G. van, Renckens, R., Ruiter-Pronk, D., Truijen-Oud, F.A. van, Stuart, J.W.T.C., IJzerman, E.P., Jansen, R., Reijden, W.A. van der, Brinkman, K., Berk, G.E.L. van den, Blok, W.L., Frissen, P.H.J., Lettinga, K.D., Schouten, W.E.M., Veenstra, J., Brouwer, C.J., Geerders, G.F., Hoeksema, K., Kleene, M.J., Meche, I.B. van der, Spelbrink, M., Toonen, A.J.M., Wijnands, S., Kwa, D., Regez, R., Crevel, R. van, Keuter, M., Ven, A.J.A.M. van der, Hofstede, H.J.M. ter, Dofferhoff, A.S.M., Hoogerwerf, J., Grintjes-Huisman, K.J.T., Haan, M. de, Marneef, M., Rahamat-Langendoen, J., Stelma, F.F., Burger, D., Gisolf, E.H., Hassing, R.J., Claassen, M., Beest, G. ter, Bentum, P.H.M. van, Langebeek, N., Tiemessen, R., Swanink, C.M.A., Lelyveld, S.F.L. van, Soetekouw, R., Prijt, L.M.M. van der, Swaluw, J. van der, Bermon, N., Herpers, B.L., Veenendaal, D., Verhagen, D.W.M., Wijk, M. van, Bierman, W.F.W., Bakker, M., Kleinnijenhuis, J., Kloeze, E., Stienstra, Y., Wilting, K.R., Wouthuyzen-Bakker, M., Boonstra, A., Meulen, P.A. van der, Weerd, D.A. de, Niesters, H.G.M., Leer-Buter, C.C. van, Knoester, M., Hoepelman, A.I.M., Barth, R.E., Bruns, A.H.W., Ellerbroek, P.M., Mudrikova, T., Oosterheert, J.J., Schadd, E.M., Wassenberg, M.W.M., Zoelen, M.A.D. van, Aarsman, K., Elst-Laurijssen, D.H., Rozemeijer, Graduate School, AII - Infectious diseases, APH - Aging & Later Life, Infectious diseases, Global Health, APH - Digital Health, APH - Personalized Medicine, APH - Global Health, Microbes in Health and Disease (MHD), Neurochirurgie, RS: MHeNs - R3 - Neuroscience, Med Microbiol, Infect Dis & Infect Prev, MUMC+: DA MMI Staf (9), RS: CAPHRI - R4 - Health Inequities and Societal Participation, Internal medicine, Pediatric surgery, Amsterdam Movement Sciences - Rehabilitation & Development, ACS - Diabetes & metabolism, AGEM - Digestive immunity, Medical Microbiology and Infection Prevention, Amsterdam Reproduction & Development (AR&D), Internal Medicine, Virology, and Medical Microbiology & Infectious Diseases

Subjects
Male, Heart disease, Human immunodeficiency virus (HIV), risk prediction algorithms, Blood Pressure, HIV Infections, Disease, 030312 virology, medicine.disease_cause, SUBCLINICAL ATHEROSCLEROSIS, Risk Factors, cardiovascular disease, FRAMINGHAM, Pharmacology (medical), Netherlands, 0303 health sciences, INFECTED PATIENTS, Framingham Risk Score, Middle Aged, Prediction algorithms, Cholesterol, Infectious Diseases, Anti-Retroviral Agents, Cardiovascular Diseases, HUMAN-IMMUNODEFICIENCY-VIRUS, Female, Risk assessment, Algorithms, Adult, Anti-HIV Agents, CARDIOLOGY/AMERICAN HEART ASSOCIATION, HEART-DISEASE, AMERICAN-COLLEGE, DATA-COLLECTION, Risk Assessment, EVENTS, 03 medical and health sciences, SDG 3 - Good Health and Well-being, INFLAMMATION, Environmental health, SCORE, medicine, Humans, Propensity Score, business.industry, HIV, medicine.disease, CD4 Lymphocyte Count, MYOCARDIAL-INFARCTION, Propensity score matching, Disease risk, business
Abstract

Background: People living with HIV (PLWH) experience a higher cardiovascular disease (CVD) risk. Yet, traditional algorithms are often used to estimate CVD risk. We evaluated the performance of 4 commonly used algorithms.Setting: The Netherlands.Methods: We used data from 16,070 PLWH aged > 18 years, who were in care between 2000 and 2016, had no pre-existing CVD, had initiated first combination antiretroviral therapy >1 year ago, and had available data on CD4 count, smoking status, cholesterol, and blood pressure. Predictive performance of 4 algorithms [Data Collection on Adverse Effects of Anti-HIV Drugs Study (D: A: D); Systematic COronary Risk Evaluation adjusted for national data (SCORE-NL); Framingham CVD Risk Score (FRS); and American College of Cardiology and American Heart Association Pooled Cohort Equations (PCE)] was evaluated using a Kaplan-Meier approach. Model discrimination was assessed using Harrell's C-statistic. Calibration was assessed using observed-versusexpected ratios, calibration plots, and Greenwood-Nam-D'Agostino goodness-of-fit tests.Results: All algorithms showed acceptable discrimination (Harrell's C-statistic 0.73-0.79). On a population level, D: A: D, SCORE-NL, and PCE slightly underestimated, whereas FRS slightly overestimated CVD risk (observed-versus-expected ratios 1.35, 1.38, 1.14, and 0.92, respectively). D: A: D, FRS, and PCE best fitted our data but still yielded a statistically significant lack of fit (Greenwood-Nam-D'Agostino chi(2) ranged from 24.57 to 34.22, P Conclusions: All algorithms perform reasonably well in PLWH, with SCORE-NL performing poorest. Prediction algorithms are useful for clinical practice, but clinicians should be aware of their limitations (ie, lack of fit and slight underestimation of CVD risk in low-risk groups).

Published
2019

3. The Effects of Selective Hematopoietic Expression of Human IL-37 on Systemic Inflammation and Atherosclerosis in LDLr-Deficient Mice

Author

Hoeke, G., Khedoe, P., Diepen, J.A. van, Pike-Overzet, K., Ven, B. van de, Vazirpanah, N., Mol, I., Hiemstra, P.S., Staal, F.J., Stienstra, R., Netea, M.G., Dinarello, C.A., Rensen, P.C., Berbee, J.F., Hoeke, G., Khedoe, P., Diepen, J.A. van, Pike-Overzet, K., Ven, B. van de, Vazirpanah, N., Mol, I., Hiemstra, P.S., Staal, F.J., Stienstra, R., Netea, M.G., Dinarello, C.A., Rensen, P.C., and Berbee, J.F.

Abstract

Contains fulltext : 177479.pdf (publisher's version ) (Open Access), The human cytokine interleukin (IL)-37 has potent anti-inflammatory capacities, and hematopoietic cell-specific transgenic overexpression of IL-37 in mice protects against septic shock and colitis. In the present study we investigated the effect of hematopoietic expression of IL-37 on atherosclerosis development under low-grade inflammatory conditions. Low-density lipoprotein receptor (LDLr)-deficient mice were lethally irradiated and transplanted with bone marrow from IL-37-transgenic or control wild-type mice and fed a Western-type diet (WTD; 1% cholesterol) for eight weeks. Metabolic and inflammatory parameters were monitored and atherosclerosis was assessed in the aortic valve area. Hematopoietic IL-37 expression did not influence body weight, food intake and plasma cholesterol levels during the study. Plasma soluble E-selectin levels were increased with WTD-feeding as compared to chow-feeding, but were not influenced by IL-37 expression. IL-37 expression reduced the inflammatory state as indicated by reduced white blood cell counts and by reduced basal and lipopolysaccharide-induced cytokine response by peritoneal macrophages ex vivo. IL-37 expression did not influence the atherosclerotic lesion area. Lesion composition was marginally affected. Smooth muscle cell content was decreased, but macrophage and collagen content were not different. We conclude that under low-grade inflammatory conditions, hematopoietic IL-37 expression reduces the inflammatory state, but does not influence atherosclerosis development in hyperlipidemic LDLr-deficient mice.

Published
2017

5. Emotion work and emotional exhaustion in teachers: The job and individual perspective

Author

Näring, G.W.B., Vlerick, P., Ven, B. van de, Näring, G.W.B., Vlerick, P., and Ven, B. van de

Abstract

Contains fulltext : Repository-Emotion-work-EduStudies-Naring-Vlerick-VandeVen.pdf (publisher's version ) (Closed access), Teaching requires much emotion work which takes its toll on teachers. Emotion work is usually studied from one of two perspectives, a job or an individual perspective. In this study, we assessed the relative importance of these two perspectives in predicting emotional exhaustion. More than 200 teachers completed a questionnaire comprising the DISQ (Demand‐Induced Strain Compensation Questionnaire), the Dutch Questionnaire on Emotional Labour (D‐QEL), and the UBOS (Utrechtse Burnout Schaal [Utrecht Burnout Scale]). In line with previous studies, our findings indicated that emotional exhaustion is positively associated with emotional job demands and surface acting. The relative importance of the two operationalisations of emotion work was assessed by comparing the results of two regression analyses. Whereas the model with job demands explained 18% of the variance, the model with emotional labour explained only 5%. In understanding what might contribute to emotional exhaustion in teachers, the emotional job demands might be much more important than the self‐regulation perspective that is measured with emotional labour.

Published
2012

6. Drugs en kalmeringsmiddelen in het oppervlaktewater

Author

Aa, M. van der, Dijkman, E., Ven, B. van de, Steegh, A. van der, Emke, E., Helmus, R., Voogt, P. de, Bijlsma, R., Hernández, F., Aa, M. van der, Dijkman, E., Ven, B. van de, Steegh, A. van der, Emke, E., Helmus, R., Voogt, P. de, Bijlsma, R., and Hernández, F.

Abstract

In het oppervlaktewater van de Rijn en de Maas zijn lage concentraties aangetoond van twaalf in de Opiumwet opgenomen stoffen. Het gaat om amfetaminen, slaap- en kalmeringsmiddelen (barbituraten en benzodiazepinen), opiaten en cocaïne. Deze stoffen zijn waarschijnlijk al in het watersysteem aanwezig sinds mensen ze gebruiken, maar kunnen nu worden opgespoord dankzij geavanceerde meettechnieken, die sinds kort beschikbaar zijn. Tijdens de drinkwaterzuivering worden de meeste stoffen verwijderd of sterk in concentratie verlaagd. In het drinkwater worden uiteindelijk nog drie stoffen aangetroffen, allen barbituraten. De concentraties zijn zeer laag; maximaal 12 nanogram per liter. De gezondheidskundige risiconormen voor drinkwater worden dan ook niet overschreden. Het is raadzaam de aanwezigheid van deze stoffen in het watersysteem te blijven volgen. Daarnaast wordt aanbevolen de mogelijke effecten op het ecosysteem te onderzoeken.

Published
2011

8. De economische kracht van de baggerindustrie: clusterstudie met behulp van de 'methode Porter'

Author

Jacobs, D., Limpens, I., Kuijper, J., Ven, B. van de, and Studiecentrum voor technologie en beleid TNO

Abstract

Deze clusterstudie van de Nederlands-Belgische baggerindustrie is uitgevoerd in opdracht van IHC Holland, de belangrijkste bouwer van baggerschepen ter wereld, en de Vereniging Centrale Baggerbedrijf, de branche-organisatie van aannemers in de bagger. De bedoeling is een beter inzicht te krijgen in de sterktes en zwaktes van dit cluster, als ook op de uitdagingen en bedreigingen die aan de orde zljn.

Published
1993

9. Time asymmetric quantum theory – I. Modifying an axiom of quantum physics

Author

Bohm, A.R., Loewe, M., and Ven, B. Van de

Abstract

A slight modification of one axiom of quantum theory changes a reversible theory into a time asymmetric theory. Whereas the standard Hilbert space axiom does not distinguish mathematically between the space of states (in-states of scattering theory) and the space of observables (out-“states” of scattering theory) the new axiom associates states and observables to two different Hardy subspaces which are dense in the same Hilbert space and analytic in the lower and upper complex energy plane, respectively. As a consequence of this new axiom the dynamical equations (Schrödinger or Heisenberg) integrate to a semigroup evolution. Extending this new Hardy space axiom to a relativistic theory provides a relativistic theory of resonance scattering and decay with Born probablilities that fulfill Einstein causality and the exponential decay law.

Published
2003
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