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Shelley M Speed - One of the best experts on this subject based on the ideXlab platform.
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analysis of prevertebral soft tissue swelling and dysphagia in multilevel anterior cervical discectomy and Fusion with recombinant human bone morphogenetic protein 2 in patients at risk for pseudarthrosis
Journal of Neurosurgery, 2011Co-Authors: Joseph B Stachniak, Jeffrey D Diebner, Estee S Brunk, Shelley M SpeedAbstract:Object The goal of this study was to demonstrate the incidence of Fusion and soft-tissue swelling in multilevel anterior cervical discectomies and Fusions (ACDFs) using polyetheretherketone (PEEK) spacers with recombinant human bone morphogenetic protein–2 (rhBMP-2) impregnated in a Type I collagen sponge and titanium plates. Methods A single surgeon performed 30 multilevel ACDFs using PEEK spacers with an rhBMP-2 impregnated collagen sponge (0.4 ml, or the equivalent of 0.6 mg rhBMP-2). Soft-tissue swelling was assessed using cervical spine radiographs on postoperative Day 1 and at 2, 6, and 10 weeks and 6 months after surgery. Incidence of dysphagia was assessed with the Cervical Spine Research Society Swallowing–Quality of Life tool. Clinical success was evaluated with the Neck Disability Index, neck pain scores, and arm pain scores. Final Fusion was assessed with CT by an independent neuroradiologist. Results Patients were followed for 6 months unless they had an Incomplete Fusion; those patients were...
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analysis of prevertebral soft tissue swelling and dysphagia in multilevel anterior cervical discectomy and Fusion with recombinant human bone morphogenetic protein 2 in patients at risk for pseudarthrosis
Journal of Neurosurgery, 2011Co-Authors: Joseph B Stachniak, Jeffrey D Diebner, Estee S Brunk, Shelley M SpeedAbstract:Object The goal of this study was to demonstrate the incidence of Fusion and soft-tissue swelling in multilevel anterior cervical discectomies and Fusions (ACDFs) using polyetheretherketone (PEEK) spacers with recombinant human bone morphogenetic protein–2 (rhBMP-2) impregnated in a Type I collagen sponge and titanium plates. Methods A single surgeon performed 30 multilevel ACDFs using PEEK spacers with an rhBMP-2 impregnated collagen sponge (0.4 ml, or the equivalent of 0.6 mg rhBMP-2). Soft-tissue swelling was assessed using cervical spine radiographs on postoperative Day 1 and at 2, 6, and 10 weeks and 6 months after surgery. Incidence of dysphagia was assessed with the Cervical Spine Research Society Swallowing–Quality of Life tool. Clinical success was evaluated with the Neck Disability Index, neck pain scores, and arm pain scores. Final Fusion was assessed with CT by an independent neuroradiologist. Results Patients were followed for 6 months unless they had an Incomplete Fusion; those patients were...
Joseph B Stachniak - One of the best experts on this subject based on the ideXlab platform.
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analysis of prevertebral soft tissue swelling and dysphagia in multilevel anterior cervical discectomy and Fusion with recombinant human bone morphogenetic protein 2 in patients at risk for pseudarthrosis
Journal of Neurosurgery, 2011Co-Authors: Joseph B Stachniak, Jeffrey D Diebner, Estee S Brunk, Shelley M SpeedAbstract:Object The goal of this study was to demonstrate the incidence of Fusion and soft-tissue swelling in multilevel anterior cervical discectomies and Fusions (ACDFs) using polyetheretherketone (PEEK) spacers with recombinant human bone morphogenetic protein–2 (rhBMP-2) impregnated in a Type I collagen sponge and titanium plates. Methods A single surgeon performed 30 multilevel ACDFs using PEEK spacers with an rhBMP-2 impregnated collagen sponge (0.4 ml, or the equivalent of 0.6 mg rhBMP-2). Soft-tissue swelling was assessed using cervical spine radiographs on postoperative Day 1 and at 2, 6, and 10 weeks and 6 months after surgery. Incidence of dysphagia was assessed with the Cervical Spine Research Society Swallowing–Quality of Life tool. Clinical success was evaluated with the Neck Disability Index, neck pain scores, and arm pain scores. Final Fusion was assessed with CT by an independent neuroradiologist. Results Patients were followed for 6 months unless they had an Incomplete Fusion; those patients were...
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analysis of prevertebral soft tissue swelling and dysphagia in multilevel anterior cervical discectomy and Fusion with recombinant human bone morphogenetic protein 2 in patients at risk for pseudarthrosis
Journal of Neurosurgery, 2011Co-Authors: Joseph B Stachniak, Jeffrey D Diebner, Estee S Brunk, Shelley M SpeedAbstract:Object The goal of this study was to demonstrate the incidence of Fusion and soft-tissue swelling in multilevel anterior cervical discectomies and Fusions (ACDFs) using polyetheretherketone (PEEK) spacers with recombinant human bone morphogenetic protein–2 (rhBMP-2) impregnated in a Type I collagen sponge and titanium plates. Methods A single surgeon performed 30 multilevel ACDFs using PEEK spacers with an rhBMP-2 impregnated collagen sponge (0.4 ml, or the equivalent of 0.6 mg rhBMP-2). Soft-tissue swelling was assessed using cervical spine radiographs on postoperative Day 1 and at 2, 6, and 10 weeks and 6 months after surgery. Incidence of dysphagia was assessed with the Cervical Spine Research Society Swallowing–Quality of Life tool. Clinical success was evaluated with the Neck Disability Index, neck pain scores, and arm pain scores. Final Fusion was assessed with CT by an independent neuroradiologist. Results Patients were followed for 6 months unless they had an Incomplete Fusion; those patients were...
D Singh - One of the best experts on this subject based on the ideXlab platform.
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study of Incomplete Fusion reaction dynamics in c13 165ho system and its dependence on various entrance channel parameters
Nuclear Physics, 2018Co-Authors: Suhail A Tali, Harish Kumar, Afzal M Ansari, Asif Ali, D Singh, Rahbar Ali, Pankaj K Giri, Sneha B Linda, Siddharth Parashari, R KumarAbstract:Abstract The excitation functions for the evaporation residues populated in the interaction of C 13 + 165 Ho system have been measured at projectile energies ≈ 4–7 MeV/nucleon. Stacked foil activation technique followed by off-line γ-ray spectroscopy have been employed in the present work. The experimentally measured cross-sections are analyzed in the frame work of statistical model code PACE4, which takes into account only the complete Fusion reaction cross-sections. The evaporation residues populated via xn and pxn channels were found to be in good agreement with the PACE4 predictions, while a significant enhancement in the measured cross-sections over PACE4 predictions is observed in case of α-emitting channels, which may be attributed to the Incomplete Fusion process. For the better understanding of Incomplete Fusion dynamics, the Incomplete Fusion fraction has also been deduced and its sensitivity with various entrance channel parameters like: projectile energy, mass-asymmetry, projectile structure in terms of Q α -value and Coulomb effect has been studied in the present work. The Incomplete Fusion fraction is found to increase with increasing the projectile energy and a strong projectile structure dependent mass-asymmetry systematic is also observed. The Incomplete Fusion fraction is also found to be small for more negative Q α -value projectile (13C) induced reactions as compared to less negative Q α -value projectiles (12C, 16O and 20Ne) induced reactions with the same target nucleus 165Ho. An interesting trend is obtained on further investigation of Incomplete Fusion dependence on Coulomb effect ( Z P Z T ).
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observed side feeding in Incomplete Fusion dynamics in 16 o 160 gd reaction at energy 5 6 mev a spin distribution measurements
Nuclear Physics, 2017Co-Authors: Rahbar Ali, Afzal M Ansari, D Singh, Rakesh Kumar, D P Singh, M K Sharma, Unnati Gupta, B P Singh, P D Shidling, D NegiAbstract:Abstract Spin distributions of various residues populated via complete Fusion (CF) and Incomplete Fusion (ICF) reactions in the interaction of 16 O with 160 Gd at the projectile energy E proj ∼ 5.6 MeV/A have been studied. The experimentally measured spin distributions of the residues associated with the ICF reactions are found to be distinctly different from those populated via the CF reactions. An attempt has been made to extract the side-feeding pattern from the spin distributions of CF and ICF reaction products. It has been observed that the CF products are strongly fed over a broad spin range. But, no side-feeding takes place in the low observed spins as low partial waves are strongly hindered in the fast α -emission channels (associated with ICF) in the forward direction. It has also been observed that the mean input angular momentum for direct α -emitting (ICF) channels is relatively higher than evaporation α -emitting (CF) channels, and it increases with direct α -multiplicity in forward direction.
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observation of entrance channel mass asymmetry effect on Incomplete Fusion reaction for ne20 ho165 system
Nuclear Physics, 2012Co-Authors: D Singh, Afzal M Ansari, Rahbar Ali, B S Tomar, M H Rashid, R Guin, Souvik DasAbstract:Abstract An experiment has been performed to explore the Incomplete Fusion (ICF) reaction dynamics in heavy ion induced reactions. Excitation functions (EFs) for eighteen evaporation residues (ERs) produced in the system Ne 20 + Ho 165 have been measured in the energy range ≈ 88 – 164 MeV . Some of the ERs have significant contribution from precursor decay, which has been separated out from the measured cumulative cross-sections to get direct production cross-sections. Parameters of the statistical model code PACE-2 are optimized to reproduce the ERs populated in complete Fusion reactions such as in xn and pxn channels. Using the same parameters, EFs for the residues produced in α-particle(s) emission channels have been calculated. A significant enhancement in the measured EFs of the ERs produced in α-particle(s) emission channels over the PACE-2 predictions have been observed which indicates the occurrence of Incomplete Fusion reaction process. In the ICF process the break-up of projectile 20Ne into He 4 + O 16 and/or Be 8 + C 12 takes place followed by Fusion of one of the fragments with the target nucleus 165Ho. The present data analyses suggest that probability of Incomplete Fusion reaction increases with projectile energy. The ICF fraction F ICF has been estimated and found to increase with increasing mass-asymmetry [ A T / ( A T + A P ) ] of the partners in entrance channel. It is also observed that critical angular momentum associated with Incomplete Fusion channels at higher projectile energy may be associated with l-values lower than that of peripheral collisions, indicating that the Incomplete Fusion competes with complete Fusion even at angular momentum values little lower than critical angular momentum.
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reaction mechanism in the sup 20 ne sup 59 co system at 3 7 mev nucleon and observation of entrance channel mass asymmetry of the Incomplete Fusion fraction
Physical Review C, 2011Co-Authors: D Singh, Afzal M Ansari, Rahbar Ali, B S Tomar, M H Rashid, R Guin, S K DasAbstract:Incomplete Fusion of {sup 20}Ne with {sup 59}Co has been investigated at 3-7 MeV/nucleon using the measurement and analysis of excitation functions. The recoil-catcher technique followed by offline gamma-ray spectroscopy has been employed. Evaporation residues are found to have contributions from precursor decays, which have been separated out from the measured cumulative cross sections of evaporation residues. Measured independent cross sections are compared with PACE-2 predictions. The PACE-2 calculations are carried out for evaporation residues formed in complete Fusion (CF), and the parameters are optimized so as to reproduce the cross section of evaporation residues produced exclusively in CF, e.g., xn and pxn products. With these parameters, the predicted CF cross sections for alpha emission products are calculated. Any substantial enhancement in the experimental cross section over the PACE-2 prediction is taken as a signature of Incomplete Fusion (ICF). The analysis indicates the occurrence of Incomplete Fusion involving the breakup of {sup 20}Ne into {sup 16}O + {sup 4}He and/or {sup 12}C + {sup 8}Be(2{alpha}) followed by Fusion of one of the fragments with the target nucleus {sup 59}Co. These data also suggest that the probability of Incomplete Fusion increases with the projectile energy. Moreover, the ICF probability is foundmore » to increase with entrance-channel mass-asymmetry of the projectile-target systems.« less
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disentangling full and partial linear momentum transfer events in the sup 16 o sup 169 tm system at e sub proj 5 4 mev nucleon
Physical Review C, 2009Co-Authors: Unnati Gupta, D Singh, R Kumar, B P Singh, Abhishek Yadav, Pushpendra P Singh, Manoj Kumar Sharma, Sunita Gupta, H D Bhardwaj, R PrasadAbstract:Forward recoil ranges of heavy reaction products have been measured to disentangle full and/or partial linear momentum transfer events in the {sup 16}O+{sup 169}Tm system at E{sub proj}{approx_equal}76 and 81 MeV. The experimentally measured forward recoil ranges of complete and/or Incomplete Fusion products are found to be in satisfactory agreement with that estimated using range-energy formulations. The angular distributions of several heavy reaction products have also been measured at E{sub proj}{approx_equal}81 MeV to get complementary information about Incomplete Fusion. To figure out the influence of Incomplete Fusion on complete Fusion at such low projectile energies, the relative strengths of their contributions in {alpha}-emitting channel(s) have been deduced from the measurement of recoil range distributions.
Rahbar Ali - One of the best experts on this subject based on the ideXlab platform.
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study of Incomplete Fusion reaction dynamics in c13 165ho system and its dependence on various entrance channel parameters
Nuclear Physics, 2018Co-Authors: Suhail A Tali, Harish Kumar, Afzal M Ansari, Asif Ali, D Singh, Rahbar Ali, Pankaj K Giri, Sneha B Linda, Siddharth Parashari, R KumarAbstract:Abstract The excitation functions for the evaporation residues populated in the interaction of C 13 + 165 Ho system have been measured at projectile energies ≈ 4–7 MeV/nucleon. Stacked foil activation technique followed by off-line γ-ray spectroscopy have been employed in the present work. The experimentally measured cross-sections are analyzed in the frame work of statistical model code PACE4, which takes into account only the complete Fusion reaction cross-sections. The evaporation residues populated via xn and pxn channels were found to be in good agreement with the PACE4 predictions, while a significant enhancement in the measured cross-sections over PACE4 predictions is observed in case of α-emitting channels, which may be attributed to the Incomplete Fusion process. For the better understanding of Incomplete Fusion dynamics, the Incomplete Fusion fraction has also been deduced and its sensitivity with various entrance channel parameters like: projectile energy, mass-asymmetry, projectile structure in terms of Q α -value and Coulomb effect has been studied in the present work. The Incomplete Fusion fraction is found to increase with increasing the projectile energy and a strong projectile structure dependent mass-asymmetry systematic is also observed. The Incomplete Fusion fraction is also found to be small for more negative Q α -value projectile (13C) induced reactions as compared to less negative Q α -value projectiles (12C, 16O and 20Ne) induced reactions with the same target nucleus 165Ho. An interesting trend is obtained on further investigation of Incomplete Fusion dependence on Coulomb effect ( Z P Z T ).
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observed side feeding in Incomplete Fusion dynamics in 16 o 160 gd reaction at energy 5 6 mev a spin distribution measurements
Nuclear Physics, 2017Co-Authors: Rahbar Ali, Afzal M Ansari, D Singh, Rakesh Kumar, D P Singh, M K Sharma, Unnati Gupta, B P Singh, P D Shidling, D NegiAbstract:Abstract Spin distributions of various residues populated via complete Fusion (CF) and Incomplete Fusion (ICF) reactions in the interaction of 16 O with 160 Gd at the projectile energy E proj ∼ 5.6 MeV/A have been studied. The experimentally measured spin distributions of the residues associated with the ICF reactions are found to be distinctly different from those populated via the CF reactions. An attempt has been made to extract the side-feeding pattern from the spin distributions of CF and ICF reaction products. It has been observed that the CF products are strongly fed over a broad spin range. But, no side-feeding takes place in the low observed spins as low partial waves are strongly hindered in the fast α -emission channels (associated with ICF) in the forward direction. It has also been observed that the mean input angular momentum for direct α -emitting (ICF) channels is relatively higher than evaporation α -emitting (CF) channels, and it increases with direct α -multiplicity in forward direction.
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low energy nuclear reaction of the n 14 tm 169 system Incomplete Fusion
Physical Review C, 2017Co-Authors: R Kumar, Rahbar Ali, Avinash Agarwal, B P Singh, Vijay R Sharma, Abhishek Yadav, Pushpendra Singh, S Appannababu, S Mukherjee, R K BhowmikAbstract:Excitation functions of reaction residues produced in the $^{14}\mathrm{N}+^{169}\mathrm{Tm}$ system have been measured to high precision at energies above the Fusion barrier, ranging from $1.04{V}_{B}$ to $1.30{V}_{B}$, and analyzed in the framework of the statistical model code pace4. Analysis of $\ensuremath{\alpha}$-emitting channels points toward the onset of Incomplete Fusion even at slightly above-barrier energies where complete Fusion is supposed to be one of the dominant processes. The onset and strength of Incomplete Fusion have been deduced and studied in terms of various entrance channel parameters. Present results together with the reanalysis of existing data for various projectile-target combinations conclusively suggest strong influence of projectile structure on the onset of Incomplete Fusion. Also, a strong dependence on the Coulomb effect $({Z}_{P}{Z}_{T})$ has been observed for the present system along with different projectile-target combinations available in the literature. It is concluded that the fraction of Incomplete Fusion linearly increases with ${Z}_{P}{Z}_{T}$ and is found to be more for larger ${Z}_{P}{Z}_{T}$ values, indicating significantly important linear systematics.
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observation of entrance channel mass asymmetry effect on Incomplete Fusion reaction for ne20 ho165 system
Nuclear Physics, 2012Co-Authors: D Singh, Afzal M Ansari, Rahbar Ali, B S Tomar, M H Rashid, R Guin, Souvik DasAbstract:Abstract An experiment has been performed to explore the Incomplete Fusion (ICF) reaction dynamics in heavy ion induced reactions. Excitation functions (EFs) for eighteen evaporation residues (ERs) produced in the system Ne 20 + Ho 165 have been measured in the energy range ≈ 88 – 164 MeV . Some of the ERs have significant contribution from precursor decay, which has been separated out from the measured cumulative cross-sections to get direct production cross-sections. Parameters of the statistical model code PACE-2 are optimized to reproduce the ERs populated in complete Fusion reactions such as in xn and pxn channels. Using the same parameters, EFs for the residues produced in α-particle(s) emission channels have been calculated. A significant enhancement in the measured EFs of the ERs produced in α-particle(s) emission channels over the PACE-2 predictions have been observed which indicates the occurrence of Incomplete Fusion reaction process. In the ICF process the break-up of projectile 20Ne into He 4 + O 16 and/or Be 8 + C 12 takes place followed by Fusion of one of the fragments with the target nucleus 165Ho. The present data analyses suggest that probability of Incomplete Fusion reaction increases with projectile energy. The ICF fraction F ICF has been estimated and found to increase with increasing mass-asymmetry [ A T / ( A T + A P ) ] of the partners in entrance channel. It is also observed that critical angular momentum associated with Incomplete Fusion channels at higher projectile energy may be associated with l-values lower than that of peripheral collisions, indicating that the Incomplete Fusion competes with complete Fusion even at angular momentum values little lower than critical angular momentum.
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reaction mechanism in the sup 20 ne sup 59 co system at 3 7 mev nucleon and observation of entrance channel mass asymmetry of the Incomplete Fusion fraction
Physical Review C, 2011Co-Authors: D Singh, Afzal M Ansari, Rahbar Ali, B S Tomar, M H Rashid, R Guin, S K DasAbstract:Incomplete Fusion of {sup 20}Ne with {sup 59}Co has been investigated at 3-7 MeV/nucleon using the measurement and analysis of excitation functions. The recoil-catcher technique followed by offline gamma-ray spectroscopy has been employed. Evaporation residues are found to have contributions from precursor decays, which have been separated out from the measured cumulative cross sections of evaporation residues. Measured independent cross sections are compared with PACE-2 predictions. The PACE-2 calculations are carried out for evaporation residues formed in complete Fusion (CF), and the parameters are optimized so as to reproduce the cross section of evaporation residues produced exclusively in CF, e.g., xn and pxn products. With these parameters, the predicted CF cross sections for alpha emission products are calculated. Any substantial enhancement in the experimental cross section over the PACE-2 prediction is taken as a signature of Incomplete Fusion (ICF). The analysis indicates the occurrence of Incomplete Fusion involving the breakup of {sup 20}Ne into {sup 16}O + {sup 4}He and/or {sup 12}C + {sup 8}Be(2{alpha}) followed by Fusion of one of the fragments with the target nucleus {sup 59}Co. These data also suggest that the probability of Incomplete Fusion increases with the projectile energy. Moreover, the ICF probability is foundmore » to increase with entrance-channel mass-asymmetry of the projectile-target systems.« less
Jeffrey D Diebner - One of the best experts on this subject based on the ideXlab platform.
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analysis of prevertebral soft tissue swelling and dysphagia in multilevel anterior cervical discectomy and Fusion with recombinant human bone morphogenetic protein 2 in patients at risk for pseudarthrosis
Journal of Neurosurgery, 2011Co-Authors: Joseph B Stachniak, Jeffrey D Diebner, Estee S Brunk, Shelley M SpeedAbstract:Object The goal of this study was to demonstrate the incidence of Fusion and soft-tissue swelling in multilevel anterior cervical discectomies and Fusions (ACDFs) using polyetheretherketone (PEEK) spacers with recombinant human bone morphogenetic protein–2 (rhBMP-2) impregnated in a Type I collagen sponge and titanium plates. Methods A single surgeon performed 30 multilevel ACDFs using PEEK spacers with an rhBMP-2 impregnated collagen sponge (0.4 ml, or the equivalent of 0.6 mg rhBMP-2). Soft-tissue swelling was assessed using cervical spine radiographs on postoperative Day 1 and at 2, 6, and 10 weeks and 6 months after surgery. Incidence of dysphagia was assessed with the Cervical Spine Research Society Swallowing–Quality of Life tool. Clinical success was evaluated with the Neck Disability Index, neck pain scores, and arm pain scores. Final Fusion was assessed with CT by an independent neuroradiologist. Results Patients were followed for 6 months unless they had an Incomplete Fusion; those patients were...
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analysis of prevertebral soft tissue swelling and dysphagia in multilevel anterior cervical discectomy and Fusion with recombinant human bone morphogenetic protein 2 in patients at risk for pseudarthrosis
Journal of Neurosurgery, 2011Co-Authors: Joseph B Stachniak, Jeffrey D Diebner, Estee S Brunk, Shelley M SpeedAbstract:Object The goal of this study was to demonstrate the incidence of Fusion and soft-tissue swelling in multilevel anterior cervical discectomies and Fusions (ACDFs) using polyetheretherketone (PEEK) spacers with recombinant human bone morphogenetic protein–2 (rhBMP-2) impregnated in a Type I collagen sponge and titanium plates. Methods A single surgeon performed 30 multilevel ACDFs using PEEK spacers with an rhBMP-2 impregnated collagen sponge (0.4 ml, or the equivalent of 0.6 mg rhBMP-2). Soft-tissue swelling was assessed using cervical spine radiographs on postoperative Day 1 and at 2, 6, and 10 weeks and 6 months after surgery. Incidence of dysphagia was assessed with the Cervical Spine Research Society Swallowing–Quality of Life tool. Clinical success was evaluated with the Neck Disability Index, neck pain scores, and arm pain scores. Final Fusion was assessed with CT by an independent neuroradiologist. Results Patients were followed for 6 months unless they had an Incomplete Fusion; those patients were...
