The Experts below are selected from a list of 2055123 Experts worldwide ranked by ideXlab platform
Sifa Turan - One of the best experts on this subject based on the ideXlab platform.
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computerized fetal heart Rate Analysis doppler ultrasound and biophysical profile score in the prediction of acid base status of growth restricted fetuses
Ultrasound in Obstetrics & Gynecology, 2007Co-Authors: Sifa Turan, Ozhan Turan, C Berg, Dolores Moyano, A Bhide, Sarah Bower, B Thilaganathan, U GembruchAbstract:Objective To investigate the performance of non-stress test (NST), computerized fetal heart Rate Analysis (cCTG), biophysical profile scoring (BPS) and arterial and venous Doppler ultrasound investigation in the prediction of acid–base status in fetal growth restriction. Methods Growth-restricted fetuses, defined by abdominal circumference 95th percentile, were tested by NST, cCTG, BPS, and UA, middle cerebral artery (MCA), ductus venosus (DV) and umbilical vein (UV) Doppler investigation. The short-term variation (STV) of the fetal heart Rate was calculated using the Oxford Sonicaid 8002 cCTG system. Relationships between antenatal test results and cord artery pH < 7.20 were investigated, using correlation, parametric and non-parametric tests. Results Fifty-six of 58 patients (96.6%) received complete assessment of all variables. All were delivered by pre-labor Cesarean section at a median gestational age of 30 + 6 weeks. The UA pulsatility index (PI) was negatively correlated with the cCTG STV (Pearson correlation − 0.29, P < 0.05). The DV PI was negatively correlated with the pH (Pearson correlation − 0.30, P < 0.02). The cCTG mean minute variation and pH were not significantly correlated (Pearson correlation 0.13, P = 0.34). UV pulsations identified the highest proportion of neonates with a low birth pH (9/17, 53%), the highest number of false positives among patients with an abnormal BPS, abnormal DV Doppler and a STV < 3.5 ms, and also stratified false negatives among patients with an equivocal or normal BPS. Abnormal DV Doppler correctly identified false positives among patients with an abnormal BPS. cCTG reduced the Rate of an equivocal BPS from 16% to 7.1% when substituted for the traditional NST. Elevated DV Doppler index and umbilical venous pulsations predicted a low pH with 73% sensitivity and 90% specificity (P = 0.008). Conclusion In fetal growth restriction with placental insufficiency, venous Doppler investigation provides the best prediction of acid–base status. The cCTG performs best when combined with venous Doppler or as a substitute for the traditional NST in the BPS. Copyright © 2007 ISUOG. Published by John Wiley & Sons, Ltd.
Entin Hartini - One of the best experts on this subject based on the ideXlab platform.
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gamma dose Rate Analysis in biological shielding of htgr 10 mwth pebble bed reactor
Urania Jurnal Ilmiah Daur Bahan Bakar Nuklir, 2019Co-Authors: Hery Adrial, Ainon Hamzah, Entin HartiniAbstract:GAMMA DOSE Rate Analysis IN BIOLOGICAL SHIELDING OF HTGR-10 MWth PEBBLE BED REACTOR. HTGR-10 MWth is a high-temperature gas-cooled reactor. The fuel and moderator are pebble shaped with a radius of 3 cm. One fuel pebble consists of thousands of UO 2 kernels with a density of 10.4 gram/cc and the enrichment Rate of 17%. The core of HTGR-10 MWth is the center of origin of neutrons and gamma radiation resulting from the interaction of neutrons with pebble fuel, moderator and biological shield. The various types of radiations geneRated from such nuclear reactions should be monitored to ensure the safety of radiation workers. This research was conducted using MCNP-6 Program package with the aim to calculate and analyze gamma radiation dose in biological shield of HTGR-10 MWth. In this study, the biological shield is divided into 10 equal segments. The first step of the research is to benchmark the created program against the critical height of HTR-10. The results of the benchmarking show an error Rate of ± 1.1327%, while the critical core height of HTGR 10 MWth for the ratio of pebble fuel and pebble moderator (F:M) of 52: 48 occurs at a height of 134 cm. The Rate of gamma dose at the core is 3.0052E + 05 mSv/hr. On the biological shield made of regular concrete with a density of 2.3 grams/cc, the Rate of gamma dose decreases according to an equation y = 0.0042 e -0.03x . Referring to Perka Bapeten no 4 of 2013, the safe limits for workers and radiation protection officers will be achieved if the minimum thickness of biological shield is 115 cm with gamma dose Rate of 0 mSv/hour. Keywords: Gamma dose Rate, HTGR 10 MWth, biological shield, pebble
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GAMMA DOSE Rate Analysis IN BIOLOGICAL SHIELDING OF HTGR-10 MWth PEBBLE-BED REACTOR
Pusat Teknologi Bahan Bakar Nuklir, 2019Co-Authors: Hery Adrial, Amir Hamzah, Entin HartiniAbstract:GAMMA DOSE Rate Analysis IN BIOLOGICAL SHIELDING OF HTGR-10 MWth PEBBLE BED REACTOR. HTGR-10 MWth is a high-temperature gas-cooled reactor. The fuel and moderator are pebble shaped with a radius of 3 cm. One fuel pebble consists of thousands of UO2 kernels with a density of 10.4 gram/cc and the enrichment Rate of 17%. The core of HTGR-10 MWth is the center of origin of neutrons and gamma radiation resulting from the interaction of neutrons with pebble fuel, moderator and biological shield. The various types of radiations geneRated from such nuclear reactions should be monitored to ensure the safety of radiation workers. This research was conducted using MCNP-6 Program package with the aim to calculate and analyze gamma radiation dose in biological shield of HTGR-10 MWth. In this study, the biological shield is divided into 10 equal segments. The first step of the research is to benchmark the created program against the critical height of HTR-10. The results of the benchmarking show an error Rate of ± 1.1327%, while the critical core height of HTGR 10 MWth for the ratio of pebble fuel and pebble moderator (F:M) of 52: 48 occurs at a height of 134 cm. The Rate of gamma dose at the core is 3.0052E + 05 mSv/hr. On the biological shield made of regular concrete with a density of 2.3 grams/cc, the Rate of gamma dose decreases according to an equation y = 0.0042 e-0.03x. Referring to Perka Bapeten no 4 of 2013, the safe limits for workers and radiation protection officers will be achieved if the minimum thickness of biological shield is 115 cm with gamma dose Rate of 0 mSv/hour. Keywords: Gamma dose Rate, HTGR 10 MWth, biological shield, pebbl
Jiayi Zhang - One of the best experts on this subject based on the ideXlab platform.
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Unified Framework for the Effective Rate Analysis of Wireless Communication Systems Over MISO Fading Channels
IEEE Transactions on Communications, 2017Co-Authors: Jing Jiang, Jiayi ZhangAbstract:This paper proposes a unified framework for the effective Rate Analysis over arbitrary correlated and not necessarily identical multiple-input single-output (MISO) fading channels, which uses the moment generating function (MGF) based approach and H transform representation. The proposed framework has the potential to simplify the cumbersome Analysis procedure compared with the probability density function-based approach. Moreover, the effective Rates over two specific fading scenarios are investigated, namely, independent but not necessarily identical distributed (i.n.i.d.) MISO hyper Fox's H fading channels and arbitrary correlated generalized K fading channels. The exact analytical representations for these two scenarios are also presented. By substituting corresponding parameters, the effective Rates in various practical fading scenarios, such as Rayleigh, Nakagami-m, Weibull/Gamma, and generalized K fading channels, are readily available. In addition, asymptotic approximations are provided for the proposed H transform and MGF-based approach as well as for the effective Rate over i.n.i.d. MISO hyper Fox's H fading channels. Simulations under various fading scenarios are also presented, which support the validity of the proposed method.
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unified framework for the effective Rate Analysis of wireless communication systems over miso fading channels
arXiv: Information Theory, 2016Co-Authors: Minglei You, Jing Jiang, Hongjian Sun, Jiayi ZhangAbstract:This paper proposes a unified framework for the effective Rate Analysis over arbitrary correlated and not necessarily identical multiple inputs single output (MISO) fading channels, which uses moment generating function (MGF) based approach and H transform representation. The proposed framework has the potential to simplify the cumbersome Analysis procedure compared to the probability density function (PDF) based approach. Moreover, the effective Rates over two specific fading scenarios are investigated, namely independent but not necessarily identical distributed (i.n.i.d.) MISO hyper Fox's H fading channels and arbitrary correlated generalized K fading channels. The exact analytical representations for these two scenarios are also presented. By substituting corresponding parameters, the effective Rates in various practical fading scenarios, such as Rayleigh, Nakagami-m, Weibull/Gamma and generalized K fading channels, are readily available. In addition, asymptotic approximations are provided for the proposed H transform and MGF based approach as well as for the effective Rate over i.n.i.d. MISO hyper Fox's H fading channels. Simulations under various fading scenarios are also presented, which support the validity of the proposed method.
U Gembruch - One of the best experts on this subject based on the ideXlab platform.
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computerized fetal heart Rate Analysis doppler ultrasound and biophysical profile score in the prediction of acid base status of growth restricted fetuses
Ultrasound in Obstetrics & Gynecology, 2007Co-Authors: Sifa Turan, Ozhan Turan, C Berg, Dolores Moyano, A Bhide, Sarah Bower, B Thilaganathan, U GembruchAbstract:Objective To investigate the performance of non-stress test (NST), computerized fetal heart Rate Analysis (cCTG), biophysical profile scoring (BPS) and arterial and venous Doppler ultrasound investigation in the prediction of acid–base status in fetal growth restriction. Methods Growth-restricted fetuses, defined by abdominal circumference 95th percentile, were tested by NST, cCTG, BPS, and UA, middle cerebral artery (MCA), ductus venosus (DV) and umbilical vein (UV) Doppler investigation. The short-term variation (STV) of the fetal heart Rate was calculated using the Oxford Sonicaid 8002 cCTG system. Relationships between antenatal test results and cord artery pH < 7.20 were investigated, using correlation, parametric and non-parametric tests. Results Fifty-six of 58 patients (96.6%) received complete assessment of all variables. All were delivered by pre-labor Cesarean section at a median gestational age of 30 + 6 weeks. The UA pulsatility index (PI) was negatively correlated with the cCTG STV (Pearson correlation − 0.29, P < 0.05). The DV PI was negatively correlated with the pH (Pearson correlation − 0.30, P < 0.02). The cCTG mean minute variation and pH were not significantly correlated (Pearson correlation 0.13, P = 0.34). UV pulsations identified the highest proportion of neonates with a low birth pH (9/17, 53%), the highest number of false positives among patients with an abnormal BPS, abnormal DV Doppler and a STV < 3.5 ms, and also stratified false negatives among patients with an equivocal or normal BPS. Abnormal DV Doppler correctly identified false positives among patients with an abnormal BPS. cCTG reduced the Rate of an equivocal BPS from 16% to 7.1% when substituted for the traditional NST. Elevated DV Doppler index and umbilical venous pulsations predicted a low pH with 73% sensitivity and 90% specificity (P = 0.008). Conclusion In fetal growth restriction with placental insufficiency, venous Doppler investigation provides the best prediction of acid–base status. The cCTG performs best when combined with venous Doppler or as a substitute for the traditional NST in the BPS. Copyright © 2007 ISUOG. Published by John Wiley & Sons, Ltd.
Ozhan Turan - One of the best experts on this subject based on the ideXlab platform.
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computerized fetal heart Rate Analysis doppler ultrasound and biophysical profile score in the prediction of acid base status of growth restricted fetuses
Ultrasound in Obstetrics & Gynecology, 2007Co-Authors: Sifa Turan, Ozhan Turan, C Berg, Dolores Moyano, A Bhide, Sarah Bower, B Thilaganathan, U GembruchAbstract:Objective To investigate the performance of non-stress test (NST), computerized fetal heart Rate Analysis (cCTG), biophysical profile scoring (BPS) and arterial and venous Doppler ultrasound investigation in the prediction of acid–base status in fetal growth restriction. Methods Growth-restricted fetuses, defined by abdominal circumference 95th percentile, were tested by NST, cCTG, BPS, and UA, middle cerebral artery (MCA), ductus venosus (DV) and umbilical vein (UV) Doppler investigation. The short-term variation (STV) of the fetal heart Rate was calculated using the Oxford Sonicaid 8002 cCTG system. Relationships between antenatal test results and cord artery pH < 7.20 were investigated, using correlation, parametric and non-parametric tests. Results Fifty-six of 58 patients (96.6%) received complete assessment of all variables. All were delivered by pre-labor Cesarean section at a median gestational age of 30 + 6 weeks. The UA pulsatility index (PI) was negatively correlated with the cCTG STV (Pearson correlation − 0.29, P < 0.05). The DV PI was negatively correlated with the pH (Pearson correlation − 0.30, P < 0.02). The cCTG mean minute variation and pH were not significantly correlated (Pearson correlation 0.13, P = 0.34). UV pulsations identified the highest proportion of neonates with a low birth pH (9/17, 53%), the highest number of false positives among patients with an abnormal BPS, abnormal DV Doppler and a STV < 3.5 ms, and also stratified false negatives among patients with an equivocal or normal BPS. Abnormal DV Doppler correctly identified false positives among patients with an abnormal BPS. cCTG reduced the Rate of an equivocal BPS from 16% to 7.1% when substituted for the traditional NST. Elevated DV Doppler index and umbilical venous pulsations predicted a low pH with 73% sensitivity and 90% specificity (P = 0.008). Conclusion In fetal growth restriction with placental insufficiency, venous Doppler investigation provides the best prediction of acid–base status. The cCTG performs best when combined with venous Doppler or as a substitute for the traditional NST in the BPS. Copyright © 2007 ISUOG. Published by John Wiley & Sons, Ltd.
