Husam Abed - Academia.edu (original) (raw)
Papers by Husam Abed
Silicon
In this work, macro porous silicon layers were fabricated by Laser Assisted Etching. The morpholo... more In this work, macro porous silicon layers were fabricated by Laser Assisted Etching. The morphology, structure and luminescence characteristics of the porous Si were examined as functions of the etching time using Field Emission-Scanning Electron Microscopy (FE-SEM), Atomic Force Microscopy (AFM) and Photoluminescence (PL). FE-SEM pictures revealed that the macro porous silicon surface layer has macro pores with a similar structure, also the thickness of this layer and the average pore diameter have increased with the increase of etching time. The specific surface area was measured by BET method and it was found in range of 152–213 m2/g. The AFM images manifested the high roughness and root mean square at low current density which can affect the porous silicon for the gas sensing applications. The PL spectra gave the luminescence energy in the orange–red region of the visible spectrum with the energy band gap of around (2.01 eV) for n-Si etched for 16 min. Two electrode configurations have been investigated for the sensing performance toward the NH3 gas; planar and sandwich, the former depicted a gas response of 1.85, while the latter revealed an efficient and ultra-gas response of 3.5 with the fast response and recovery times.
Plasmonics, 2020
Enhancing the performance of the room temperature gas sensing that based on a wide surface area o... more Enhancing the performance of the room temperature gas sensing that based on a wide surface area of the metal oxide semiconductor is the most important field. In this paper, tin dioxide has been successfully prepared and deposited on the photoelectrochemical etched n-type silicon substrate by spray pyrolysis technique at different deposition temperatures. The constructional, morphological, and topographical properties have been inspected. The XRD patterns showed a broadening peak with a preferential one in the direction (110) having a tiny crystalline size and a huge surface area. The SEM and atomic force microscope displayed semi-spherical microstructures and nanostructures aggregated on the wall of the pores, and the others cover some pores; also, the surface was very rough and has small grains. Sensing characteristics depicted an ultra-response toward ammonia gas at the room temperature with the value of (175%) and quick response and recovery times at the deposition temperature of...
Silicon, 2021
In this work, macro porous silicon layers were fabricated by Laser Assisted Etching. The morpholo... more In this work, macro porous silicon layers were fabricated by Laser Assisted Etching. The morphology, structure and luminescence characteristics of the porous Si were examined as functions of the etching time using Field Emission-Scanning Electron Microscopy (FE-SEM), Atomic Force Microscopy (AFM) and Photoluminescence (PL). FE-SEM pictures revealed that the macro porous silicon surface layer has macro pores with a similar structure, also the thickness of this layer and the average pore diameter have increased with the increase of etching time. The specific surface area was measured by BET method and it was found in range of 152–213 m2/g. The AFM images manifested the high roughness and root mean square at low current density which can affect the porous silicon for the gas sensing applications. The PL spectra gave the luminescence energy in the orange–red region of the visible spectrum with the energy band gap of around (2.01 eV) for n-Si etched for 16 min. Two electrode configuratio...
Journal of Electronic Materials, 2021
In this study, SnO2 nanowires and antimony (Sb) nanoparticles were synthesized using SnCl4.5H2O a... more In this study, SnO2 nanowires and antimony (Sb) nanoparticles were synthesized using SnCl4.5H2O and SbCl3 by dissolving them in acetone. The solution was sprayed onto a glass substrate via the spray pyrolysis route. The x-ray diffraction (XRD) patterns confirmed a polycrystalline film with a tetragonal structure. Field emission scanning electron microscopy (FESEM) analysis of the morphology confirmed a nanowire structure of SnO2 and nanoparticle structure of Sb. Energy-dispersive x-ray spectra (EDX) showed that when the Sb concentration was increased, the SnO2 weight decreased from 72% to 68%. The optical properties were comprehensively investigated by a UV-Vis spectrophotometer, which revealed that the absorbance, reflection, and extinction coefficient increased with an increase in Sb content. The energy band gap and the refractive index exhibited a decrease with the increase in Sb content from 3.92 eV to 3.8 eV and from 2.24 to 2.22, respectively. The electrical properties showed ...
Solid-state Electronics, 2021
In this paper, the role of gold nanoparticles on the temporal response of a porous silicon gas se... more In this paper, the role of gold nanoparticles on the temporal response of a porous silicon gas sensor has been studied. The porous layer was prepared by a laser-assisted etching process using 810 nm wavelength and 2 W infrared laser diode as an illumination photonics source. The experimental etching conditions involve 20 mA/cm2 current density and 10 min etching time. Gold nanoparticles were incorporated into porous silicon structures via the ion reduction process. The characteristics of sensors were studied comprehensively by SEM, XRD, and the electrical properties were investigated for the sensor before and after the gold nanoparticles incorporation process. The obtained results manifested that the decay time of the sensor was reduced by a factor almost greater than (50%) as compared with the bare porous silicon sensor. The results were discussed based on the role of gold nanoparticles that enhanced the thermal conductivity of porous silicon. A higher thermal conductivity of about...
Journal of Physics: Conference Series, 2021
In the present work, pure and composite ZnO/CuO were effectively deposited by chemical spray pyro... more In the present work, pure and composite ZnO/CuO were effectively deposited by chemical spray pyrolysis. Structural, morphological, and topographical features have been well investigated and explained. XRD analysis showed a polycrystalline structure with hexagonal and monoclinic systems for ZnO and CuO, respectively. The crystal size that calculated from XRD patterns has decreased with the increase of CuO content, while the dislocation density and the micro strain have increased. These results lead to high defects in the structure of the nanocomposite which will be more efficient in a specific application. Moreover, the morphology of the samples was examined by FESEM and it was spherical-like shapes and has elevated points, whereas the EDX confirm the existence of the employed materials without any other undesired materials. The topography of the surface depicted a slightly rough surface which will be suitable for different nanoelectronics devices.
What do you tell a pregnant patient with a previous third- or fourth-degree tear, for whom anothe... more What do you tell a pregnant patient with a previous third- or fourth-degree tear, for whom another vaginal delivery raises the risk of further injury? Can some women safely have a trial of labor? Diagnose occult tears with ultrasound, advise these experts—and use it to assess the anal sphincters of all incontinent women.
In the present study, a procedure of the inserting of SnO2:CuO nanoparticles with different CuO n... more In the present study, a procedure of the inserting of SnO2:CuO nanoparticles with different CuO nanoparticles contents within a macroporous silicon layer (macroPSi) gas sensor was prepared and successfully investigated. The macroPSi was effectively fabricated by laser assisted etching process, and CuO nanoparticles loaded with SnO2 with a high value of surface area were successfully synthesized by the spray pyrolysis method. Atomic Force Microscopy (AFM) and Field Emission Scanning Electron Microscopy (FE-SEM) manifested a novel morphology for CuO Bucky particles inside the pores and a nano nail like structure for SnO2 with a small average grain size of CuO Bucky particles with 30% content. This morphology of nanocomposites improved the sensing performance for NH3 gas. A higher sensitivity with a very swift response and recovery times of 4 s and 55 s, respectively, was obtained with 150 ppm of NH3 gas at the room temperature. This improvement in gas sensor performance is strongly re...
Data gathering and critical events detection are two essential functionalities for Wireless Senso... more Data gathering and critical events detection are two essential functionalities for Wireless Sensor Network (WSN). In this paper, we propose double mobile sinks network architecture, where two mobile sink nodes visit the Cluster Heads (CHs) to collect the captured data, which is very energy effective in terms of energy transmission efficiency and reliable compared with the case of having one static sink node. Moreover, the proposed architecture provides a capable scheme for supporting critical and non-critical data, which assures a timely delivery for any critical event to the remote monitoring and decision-making center with minimal interference to the non-critical data. Our proposed architecture shows a superior performance in terms of packets transmission delay, and requires low buffer occupancy for the CHs nodes when compared to related work in the literature. Finally, the paper provides a preliminary hardware design and implementation for the proposed architecture.
Materials Chemistry and Physics
Abstract This study introduces an elaboration of the heat treatment influence on the morphologica... more Abstract This study introduces an elaboration of the heat treatment influence on the morphological, structural, and gas sensing performance of Tungsten trioxide. It has been coated by pulsed laser technique (PLT) using optimized conditions. The optimum crystalline size and surface area have been observed at (750 °C) of heat treatment with values of 47.81 nm and 20.45 m2/g, respectively. The surface morphology of Tungsten trioxide depicted that the shape of film has bunches of grapes-like structure with a high number of pores which is the perfect one for the sensing performance. The higher surface roughness investigated by AFM makes it more active for the gas molecules. The electronic structure analysis confirmed the presence of oxygen vacancies which provide a lot of sites for the gas molecules. The gas-sensing performance towards the (NO2) molecules has been measured, and it was found that the film sensor revealed an ultra-gas response at the room temperature with a value of (392%) for the gas concentration of (150) ppm. Furthermore, the limit of detection manifested that the device can detect the minimum value concentration of (1.72 ppm) NO2 gas molecules at the room temperature. Besides, WO3 nanostructures have high selectivity, stability, and reproducibility to the NO2 toxic gas.
2ND INTERNATIONAL CONFERENCE ON MATERIALS ENGINEERING & SCIENCE (IConMEAS 2019)
Optical and Quantum Electronics
In this paper, a porous silicon (Psi) surface modification process, including the incorporating o... more In this paper, a porous silicon (Psi) surface modification process, including the incorporating of pure and CuO mixed SnO2 within a Psi layer, was investigated. A Psi layer with a pore-like structure prepared via laser-assisted etching process with a laser illumination intensity of (40) mW/cm2 was employed as a substrate for materialization SnO2/CuO/Psi nanocomposites for gas sensing application. Pure SnO2 and SnO2:CuO nanoparticles were synthesized via a chemical spray pyrolysis process on the Psi surface at 350 °C. The materialization of SnO2:CuO/Psi nanocomposites were recognized through Field-Emission Scanning Electron Microscopy, X-ray Diffraction, Atomic Force Microscopy, and Energy-dispersive X-ray Analysis. The results displayed that the morphological properties of SnO2:CuO nanoparticles were definitely controlled by varying the CuO contents. Different shapes (nearly cubic shape and spherical shape) with various sizes of SnO2 and SnO2:CuO within the Psi surface were achieved by increasing the CuO content. SnO2:CuO/Psi nanocomposites, plans, grain size, average surface roughness, homogeneity and specific surface area of SnO2:CuO nanoparticles were considerably influenced by CuO content. The lower grain size and higher average surface roughness and specific surface area were attained when the percentage of CuO was about 30% within the structure of 70% SnO2:30% CuO, and the performance of the NH3 gas sensor revealed a short response time with a high sensitivity of (88%).
American Journal of Obstetrics and Gynecology
BACKGROUND: The American Congress of Obstetricians and Gynecologists recommends that "the surgeon... more BACKGROUND: The American Congress of Obstetricians and Gynecologists recommends that "the surgeon and patient discuss the potential benefits of the removal of the fallopian tubes during a hysterectomy in women at population risk of ovarian cancer who are not having an oophorectomy," resulting in an increasing rate of salpingectomy at the time of hysterectomy. Rates of salpingectomy are highest for laparoscopic and lowest for vaginal hysterectomy. OBJECTIVE: The primary objective of this study was to determine the feasibility of bilateral salpingectomy at the time of vaginal hysterectomy. Secondary objectives included identification of factors associated with unsuccessful salpingectomy and assessment of its impact on operating time, blood loss, surgical complications, and menopausal symptoms. STUDY DESIGN: This was a multicenter, prospective study of patients undergoing planned vaginal hysterectomy with bilateral salpingectomy. Baseline medical data along with operative findings, operative time, and blood loss for salpingectomy were recorded. Uterine weight and pathology reports for all fallopian tubes were reviewed. Patients completed the Menopause Rating Scale at baseline and at postoperative follow-up. Descriptive analyses were performed to characterize the sample and compare those with successful and unsuccessful completion of planned salpingectomy using Student t test, and χ 2 test when appropriate. Questionnaire scores were compared using paired t tests. RESULTS: Among 77 patients offered enrollment, 74 consented (96%), and complete data were available regarding primary outcome for 69 (93%). Mean age was 51 years. Median body mass index was 29.1 kg/m 2 ; median vaginal parity was 2, and 41% were postmenopausal. The indications for hysterectomy included prolapse (78%), heavy menstrual bleeding (20%), and fibroids (11%). When excluding conversions to alternate routes, vaginal salpingectomy was successfully performed in 52/64 (81%) women. Mean operating time for bilateral salpingectomy was 11 (±5.6) minutes, with additional estimated blood loss of 6 (±16.3) mL. There were 8 surgical complications: 3 hemorrhages >500 mL and 5 conversions to alternate routes of surgery,
Obstetrics & Gynecology, 2016
To update clinical practice guidelines on graft and mesh use in transvaginal pelvic organ prolaps... more To update clinical practice guidelines on graft and mesh use in transvaginal pelvic organ prolapse repair based on systematic review. DATA SOURCES: Eligible studies, published through April 2015, were retrieved through ClinicalTrials.gov, MEDLINE, and Cochrane databases and bibliography searches. METHODS OF STUDY SELECTION: We included studies of transvaginal prolapse repair that compared graft or mesh use with either native tissue repair or use of a different graft or mesh with anatomic and symptomatic outcomes with a minimum of 12 months of follow-up. TABULATION, INTEGRATION, AND RESULTS: Study data were extracted by one reviewer and confirmed by a second reviewer. Studies were classified by vaginal compartment (anterior, posterior, apical, or multiple), graft type (biologic, synthetic absorbable, synthetic nonabsorbable), and outcome (anatomic, symptomatic, sexual function, mesh complications, and return to the operating room). We found 66 comparative studies reported in 70 articles, including 38 randomized trials; quality of the literature has improved over time, but some outcomes still show heterogeneity and limited power. In the anterior vaginal compartment, synthetic nonabsorbable mesh consistently showed improved anatomic and bulge symptom outcomes compared with native tissue repairs based on meta-analyses. Other subjective outcomes, including urinary incontinence or dyspareunia, generally did not differ. Biologic graft or synthetic absorbable mesh use did not provide an advantage in any compartment. Synthetic mesh use in the posterior or apical compartments did not improve success. Mesh erosion rates ranged from 1.4-19% at the anterior vaginal wall, but 3-36% when mesh was placed in multiple compartments. Operative mesh revision rates ranged from 3-8%. CONCLUSION: Synthetic mesh augmentation of anterior wall prolapse repair improves anatomic outcomes and bulge symptoms compared with native tissue repair. Biologic grafts do not improve prolapse repair outcomes in any compartment. Mesh erosion occurred in up to 36% of patients, but reoperation rates were low.
Clinicas Medicas De Norteamerica, 2008
Journal of Pelvic Medicine and Surgery
An abstract is unavailable. This article is available as HTML full text and PDF.
Female Pelvic Medicine & Reconstructive Surgery, 2010
ABSTRACT
Silicon
In this work, macro porous silicon layers were fabricated by Laser Assisted Etching. The morpholo... more In this work, macro porous silicon layers were fabricated by Laser Assisted Etching. The morphology, structure and luminescence characteristics of the porous Si were examined as functions of the etching time using Field Emission-Scanning Electron Microscopy (FE-SEM), Atomic Force Microscopy (AFM) and Photoluminescence (PL). FE-SEM pictures revealed that the macro porous silicon surface layer has macro pores with a similar structure, also the thickness of this layer and the average pore diameter have increased with the increase of etching time. The specific surface area was measured by BET method and it was found in range of 152–213 m2/g. The AFM images manifested the high roughness and root mean square at low current density which can affect the porous silicon for the gas sensing applications. The PL spectra gave the luminescence energy in the orange–red region of the visible spectrum with the energy band gap of around (2.01 eV) for n-Si etched for 16 min. Two electrode configurations have been investigated for the sensing performance toward the NH3 gas; planar and sandwich, the former depicted a gas response of 1.85, while the latter revealed an efficient and ultra-gas response of 3.5 with the fast response and recovery times.
Plasmonics, 2020
Enhancing the performance of the room temperature gas sensing that based on a wide surface area o... more Enhancing the performance of the room temperature gas sensing that based on a wide surface area of the metal oxide semiconductor is the most important field. In this paper, tin dioxide has been successfully prepared and deposited on the photoelectrochemical etched n-type silicon substrate by spray pyrolysis technique at different deposition temperatures. The constructional, morphological, and topographical properties have been inspected. The XRD patterns showed a broadening peak with a preferential one in the direction (110) having a tiny crystalline size and a huge surface area. The SEM and atomic force microscope displayed semi-spherical microstructures and nanostructures aggregated on the wall of the pores, and the others cover some pores; also, the surface was very rough and has small grains. Sensing characteristics depicted an ultra-response toward ammonia gas at the room temperature with the value of (175%) and quick response and recovery times at the deposition temperature of...
Silicon, 2021
In this work, macro porous silicon layers were fabricated by Laser Assisted Etching. The morpholo... more In this work, macro porous silicon layers were fabricated by Laser Assisted Etching. The morphology, structure and luminescence characteristics of the porous Si were examined as functions of the etching time using Field Emission-Scanning Electron Microscopy (FE-SEM), Atomic Force Microscopy (AFM) and Photoluminescence (PL). FE-SEM pictures revealed that the macro porous silicon surface layer has macro pores with a similar structure, also the thickness of this layer and the average pore diameter have increased with the increase of etching time. The specific surface area was measured by BET method and it was found in range of 152–213 m2/g. The AFM images manifested the high roughness and root mean square at low current density which can affect the porous silicon for the gas sensing applications. The PL spectra gave the luminescence energy in the orange–red region of the visible spectrum with the energy band gap of around (2.01 eV) for n-Si etched for 16 min. Two electrode configuratio...
Journal of Electronic Materials, 2021
In this study, SnO2 nanowires and antimony (Sb) nanoparticles were synthesized using SnCl4.5H2O a... more In this study, SnO2 nanowires and antimony (Sb) nanoparticles were synthesized using SnCl4.5H2O and SbCl3 by dissolving them in acetone. The solution was sprayed onto a glass substrate via the spray pyrolysis route. The x-ray diffraction (XRD) patterns confirmed a polycrystalline film with a tetragonal structure. Field emission scanning electron microscopy (FESEM) analysis of the morphology confirmed a nanowire structure of SnO2 and nanoparticle structure of Sb. Energy-dispersive x-ray spectra (EDX) showed that when the Sb concentration was increased, the SnO2 weight decreased from 72% to 68%. The optical properties were comprehensively investigated by a UV-Vis spectrophotometer, which revealed that the absorbance, reflection, and extinction coefficient increased with an increase in Sb content. The energy band gap and the refractive index exhibited a decrease with the increase in Sb content from 3.92 eV to 3.8 eV and from 2.24 to 2.22, respectively. The electrical properties showed ...
Solid-state Electronics, 2021
In this paper, the role of gold nanoparticles on the temporal response of a porous silicon gas se... more In this paper, the role of gold nanoparticles on the temporal response of a porous silicon gas sensor has been studied. The porous layer was prepared by a laser-assisted etching process using 810 nm wavelength and 2 W infrared laser diode as an illumination photonics source. The experimental etching conditions involve 20 mA/cm2 current density and 10 min etching time. Gold nanoparticles were incorporated into porous silicon structures via the ion reduction process. The characteristics of sensors were studied comprehensively by SEM, XRD, and the electrical properties were investigated for the sensor before and after the gold nanoparticles incorporation process. The obtained results manifested that the decay time of the sensor was reduced by a factor almost greater than (50%) as compared with the bare porous silicon sensor. The results were discussed based on the role of gold nanoparticles that enhanced the thermal conductivity of porous silicon. A higher thermal conductivity of about...
Journal of Physics: Conference Series, 2021
In the present work, pure and composite ZnO/CuO were effectively deposited by chemical spray pyro... more In the present work, pure and composite ZnO/CuO were effectively deposited by chemical spray pyrolysis. Structural, morphological, and topographical features have been well investigated and explained. XRD analysis showed a polycrystalline structure with hexagonal and monoclinic systems for ZnO and CuO, respectively. The crystal size that calculated from XRD patterns has decreased with the increase of CuO content, while the dislocation density and the micro strain have increased. These results lead to high defects in the structure of the nanocomposite which will be more efficient in a specific application. Moreover, the morphology of the samples was examined by FESEM and it was spherical-like shapes and has elevated points, whereas the EDX confirm the existence of the employed materials without any other undesired materials. The topography of the surface depicted a slightly rough surface which will be suitable for different nanoelectronics devices.
What do you tell a pregnant patient with a previous third- or fourth-degree tear, for whom anothe... more What do you tell a pregnant patient with a previous third- or fourth-degree tear, for whom another vaginal delivery raises the risk of further injury? Can some women safely have a trial of labor? Diagnose occult tears with ultrasound, advise these experts—and use it to assess the anal sphincters of all incontinent women.
In the present study, a procedure of the inserting of SnO2:CuO nanoparticles with different CuO n... more In the present study, a procedure of the inserting of SnO2:CuO nanoparticles with different CuO nanoparticles contents within a macroporous silicon layer (macroPSi) gas sensor was prepared and successfully investigated. The macroPSi was effectively fabricated by laser assisted etching process, and CuO nanoparticles loaded with SnO2 with a high value of surface area were successfully synthesized by the spray pyrolysis method. Atomic Force Microscopy (AFM) and Field Emission Scanning Electron Microscopy (FE-SEM) manifested a novel morphology for CuO Bucky particles inside the pores and a nano nail like structure for SnO2 with a small average grain size of CuO Bucky particles with 30% content. This morphology of nanocomposites improved the sensing performance for NH3 gas. A higher sensitivity with a very swift response and recovery times of 4 s and 55 s, respectively, was obtained with 150 ppm of NH3 gas at the room temperature. This improvement in gas sensor performance is strongly re...
Data gathering and critical events detection are two essential functionalities for Wireless Senso... more Data gathering and critical events detection are two essential functionalities for Wireless Sensor Network (WSN). In this paper, we propose double mobile sinks network architecture, where two mobile sink nodes visit the Cluster Heads (CHs) to collect the captured data, which is very energy effective in terms of energy transmission efficiency and reliable compared with the case of having one static sink node. Moreover, the proposed architecture provides a capable scheme for supporting critical and non-critical data, which assures a timely delivery for any critical event to the remote monitoring and decision-making center with minimal interference to the non-critical data. Our proposed architecture shows a superior performance in terms of packets transmission delay, and requires low buffer occupancy for the CHs nodes when compared to related work in the literature. Finally, the paper provides a preliminary hardware design and implementation for the proposed architecture.
Materials Chemistry and Physics
Abstract This study introduces an elaboration of the heat treatment influence on the morphologica... more Abstract This study introduces an elaboration of the heat treatment influence on the morphological, structural, and gas sensing performance of Tungsten trioxide. It has been coated by pulsed laser technique (PLT) using optimized conditions. The optimum crystalline size and surface area have been observed at (750 °C) of heat treatment with values of 47.81 nm and 20.45 m2/g, respectively. The surface morphology of Tungsten trioxide depicted that the shape of film has bunches of grapes-like structure with a high number of pores which is the perfect one for the sensing performance. The higher surface roughness investigated by AFM makes it more active for the gas molecules. The electronic structure analysis confirmed the presence of oxygen vacancies which provide a lot of sites for the gas molecules. The gas-sensing performance towards the (NO2) molecules has been measured, and it was found that the film sensor revealed an ultra-gas response at the room temperature with a value of (392%) for the gas concentration of (150) ppm. Furthermore, the limit of detection manifested that the device can detect the minimum value concentration of (1.72 ppm) NO2 gas molecules at the room temperature. Besides, WO3 nanostructures have high selectivity, stability, and reproducibility to the NO2 toxic gas.
2ND INTERNATIONAL CONFERENCE ON MATERIALS ENGINEERING & SCIENCE (IConMEAS 2019)
Optical and Quantum Electronics
In this paper, a porous silicon (Psi) surface modification process, including the incorporating o... more In this paper, a porous silicon (Psi) surface modification process, including the incorporating of pure and CuO mixed SnO2 within a Psi layer, was investigated. A Psi layer with a pore-like structure prepared via laser-assisted etching process with a laser illumination intensity of (40) mW/cm2 was employed as a substrate for materialization SnO2/CuO/Psi nanocomposites for gas sensing application. Pure SnO2 and SnO2:CuO nanoparticles were synthesized via a chemical spray pyrolysis process on the Psi surface at 350 °C. The materialization of SnO2:CuO/Psi nanocomposites were recognized through Field-Emission Scanning Electron Microscopy, X-ray Diffraction, Atomic Force Microscopy, and Energy-dispersive X-ray Analysis. The results displayed that the morphological properties of SnO2:CuO nanoparticles were definitely controlled by varying the CuO contents. Different shapes (nearly cubic shape and spherical shape) with various sizes of SnO2 and SnO2:CuO within the Psi surface were achieved by increasing the CuO content. SnO2:CuO/Psi nanocomposites, plans, grain size, average surface roughness, homogeneity and specific surface area of SnO2:CuO nanoparticles were considerably influenced by CuO content. The lower grain size and higher average surface roughness and specific surface area were attained when the percentage of CuO was about 30% within the structure of 70% SnO2:30% CuO, and the performance of the NH3 gas sensor revealed a short response time with a high sensitivity of (88%).
American Journal of Obstetrics and Gynecology
BACKGROUND: The American Congress of Obstetricians and Gynecologists recommends that "the surgeon... more BACKGROUND: The American Congress of Obstetricians and Gynecologists recommends that "the surgeon and patient discuss the potential benefits of the removal of the fallopian tubes during a hysterectomy in women at population risk of ovarian cancer who are not having an oophorectomy," resulting in an increasing rate of salpingectomy at the time of hysterectomy. Rates of salpingectomy are highest for laparoscopic and lowest for vaginal hysterectomy. OBJECTIVE: The primary objective of this study was to determine the feasibility of bilateral salpingectomy at the time of vaginal hysterectomy. Secondary objectives included identification of factors associated with unsuccessful salpingectomy and assessment of its impact on operating time, blood loss, surgical complications, and menopausal symptoms. STUDY DESIGN: This was a multicenter, prospective study of patients undergoing planned vaginal hysterectomy with bilateral salpingectomy. Baseline medical data along with operative findings, operative time, and blood loss for salpingectomy were recorded. Uterine weight and pathology reports for all fallopian tubes were reviewed. Patients completed the Menopause Rating Scale at baseline and at postoperative follow-up. Descriptive analyses were performed to characterize the sample and compare those with successful and unsuccessful completion of planned salpingectomy using Student t test, and χ 2 test when appropriate. Questionnaire scores were compared using paired t tests. RESULTS: Among 77 patients offered enrollment, 74 consented (96%), and complete data were available regarding primary outcome for 69 (93%). Mean age was 51 years. Median body mass index was 29.1 kg/m 2 ; median vaginal parity was 2, and 41% were postmenopausal. The indications for hysterectomy included prolapse (78%), heavy menstrual bleeding (20%), and fibroids (11%). When excluding conversions to alternate routes, vaginal salpingectomy was successfully performed in 52/64 (81%) women. Mean operating time for bilateral salpingectomy was 11 (±5.6) minutes, with additional estimated blood loss of 6 (±16.3) mL. There were 8 surgical complications: 3 hemorrhages >500 mL and 5 conversions to alternate routes of surgery,
Obstetrics & Gynecology, 2016
To update clinical practice guidelines on graft and mesh use in transvaginal pelvic organ prolaps... more To update clinical practice guidelines on graft and mesh use in transvaginal pelvic organ prolapse repair based on systematic review. DATA SOURCES: Eligible studies, published through April 2015, were retrieved through ClinicalTrials.gov, MEDLINE, and Cochrane databases and bibliography searches. METHODS OF STUDY SELECTION: We included studies of transvaginal prolapse repair that compared graft or mesh use with either native tissue repair or use of a different graft or mesh with anatomic and symptomatic outcomes with a minimum of 12 months of follow-up. TABULATION, INTEGRATION, AND RESULTS: Study data were extracted by one reviewer and confirmed by a second reviewer. Studies were classified by vaginal compartment (anterior, posterior, apical, or multiple), graft type (biologic, synthetic absorbable, synthetic nonabsorbable), and outcome (anatomic, symptomatic, sexual function, mesh complications, and return to the operating room). We found 66 comparative studies reported in 70 articles, including 38 randomized trials; quality of the literature has improved over time, but some outcomes still show heterogeneity and limited power. In the anterior vaginal compartment, synthetic nonabsorbable mesh consistently showed improved anatomic and bulge symptom outcomes compared with native tissue repairs based on meta-analyses. Other subjective outcomes, including urinary incontinence or dyspareunia, generally did not differ. Biologic graft or synthetic absorbable mesh use did not provide an advantage in any compartment. Synthetic mesh use in the posterior or apical compartments did not improve success. Mesh erosion rates ranged from 1.4-19% at the anterior vaginal wall, but 3-36% when mesh was placed in multiple compartments. Operative mesh revision rates ranged from 3-8%. CONCLUSION: Synthetic mesh augmentation of anterior wall prolapse repair improves anatomic outcomes and bulge symptoms compared with native tissue repair. Biologic grafts do not improve prolapse repair outcomes in any compartment. Mesh erosion occurred in up to 36% of patients, but reoperation rates were low.
Clinicas Medicas De Norteamerica, 2008
Journal of Pelvic Medicine and Surgery
An abstract is unavailable. This article is available as HTML full text and PDF.
Female Pelvic Medicine & Reconstructive Surgery, 2010
ABSTRACT