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1.
Chem Rec ; 23(4): e202200294, 2023 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-36850030

RESUMEN

Chemical upcycling of waste plastics into high-value-added products is one of the most effective, cost-efficient, and environmentally beneficial solutions. Many studies have been published over the past few years on the topic of recycling plastics into usable materials through a process called catalytic pyrolysis. There is a significant research gap that must be bridged in order to use catalytic pyrolysis of waste plastics to produce high-value products. This review focuses on the enhanced catalytic pyrolysis of waste plastics to produce jet fuel, diesel oil, lubricants, aromatic compounds, syngas, and other gases. Moreover, the reaction mechanism, a brief and critical comparison of different catalytic pyrolysis studies, as well as the techno-feasibility analysis of waste plastic pyrolysis and the proposed catalytic plastic pyrolysis setup for commercialization is also covered.

2.
J Environ Sci (China) ; 125: 290-308, 2023 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-36375915

RESUMEN

Photocatalytic CO2 reduction is an appealing strategy for mitigating the environmental effects of greenhouse gases while simultaneously producing valuable carbon-neutral fuels. Numerous attempts have been made to produce effective and efficient photocatalysts for CO2 reduction. In contrast, the selection of competitive catalysts continues to be a substantial hindrance and a considerable difficulty in the development of photocatalytic CO2 reduction. It is vital to emphasize different techniques for building effective photocatalysts to improve CO2 reduction performance in order to achieve a long-term sustainability. Metal-organic frameworks (MOFs) are recently emerging as a new type of photocatalysts for CO2 reduction due to their excellent CO2 adsorption capability and unique structural characteristics. This review examines the most recent breakthroughs in various techniques for modifying MOFs in order to improve their efficiency of photocatalytic CO2 reduction. The advantages of MOFs using as photocatalysts are summarized, followed by different methods for enhancing their effectiveness for photocatalytic CO2 reduction via partial ion exchange of metal clusters, design of bimetal clusters, the modification of organic linkers, and the embedding of metal complexes. For integrating MOFs with semiconductors, metallic nanoparticles (NPs), and other materials, a number of different approaches have been also reviewed. The final section of this review discusses the existing challenges and future prospects of MOFs as photocatalysts for CO2 reduction. Hopefully, this review can stimulate intensive research on the rational design and development of more effective MOF-based photocatalysts for visible-light driven CO2 conversion.

3.
BMC Public Health ; 20(1): 1800, 2020 Nov 26.
Artículo en Inglés | MEDLINE | ID: mdl-33243192

RESUMEN

BACKGROUND: In developing countries, Pakistan is one of the countries where access to health and health-related indicators is a major concern. Their improvement would reduce inequalities among various Communities/Districts or groups of Communities. A Community health index (CHI) in this regard is estimated to explore inequality ratio, inequality slope, and spatial analysis of inequalities among all Communities at regional and geographical levels. METHODS: Data from Pakistan Social and Living Standard Measurement (PSLM) survey, Round-VI, 2014-15 were used to construct CHI. The index was constructed in two steps. In the first step, the study indicators were standardized while in the second step, the standardized indicators were aggregated into a single metric by applying non-linear Geometric Mean formula. RESULTS: The inequality ratio of 16.59 estimated for Pakistan was found to be higher than the ratio of Atlanta city, GA (5.92), whereas, a lower slope coefficient was estimated for Pakistan than Atlanta city, GA (0.38 < 0.54). This ratio of disparity was also found to be lower for urban regions as compared to rural (7.78 < 17.54). While the slope coefficient was slightly higher for urban regions (0.45 > 0.43). The results of the spatial analysis revealed different patterns of inequalities. A cluster of healthy districts was found in Punjab province, whereas districts from Baluchistan had made a bunch of deprived/unhealthy districts in terms of CHI scores. Besides, separate maps for all provinces showed that capital districts of all provinces were relatively well-off/developed. CONCLUSION: The instant results concluded that inequalities in access to health and health-related indicators exist across countries as well as across geographical regions. To reduce or eradicate these inequalities, government and public health workers are recommended to set priorities based on access to composite index.


Asunto(s)
Indicadores de Salud , Disparidades en Atención de Salud/estadística & datos numéricos , Humanos , Pakistán , Población Rural/estadística & datos numéricos , Factores Socioeconómicos , Análisis Espacial , Encuestas y Cuestionarios , Población Urbana/estadística & datos numéricos
4.
J Environ Manage ; 276: 111296, 2020 Dec 15.
Artículo en Inglés | MEDLINE | ID: mdl-32906073

RESUMEN

Drought is a complex natural hazard. It occurs due to a prolonged period of deficient in rainfall amount in a certain region. Unlike other natural hazards, drought hazard has a recurrent occurrence. Therefore, comprehensive drought monitoring is essential for regional climate control and water management authorities. In this paper, we have proposed a new drought indicator: the Seasonally Combinative Regional Drought Indicator (SCRDI). The SCRDI integrates Bayesian networking theory with Standardized Precipitation Temperature Index (SPTI) at varying gauge stations in various month/seasons. Application of SCRDI is based on five gauging stations of Northern Area of Pakistan. We have found that the proposed indicator accounts the effect of climate variation within a specified territory, accurately characterizes drought by capturing seasonal dependencies in geospatial variation scenario, and reduces the large/complex data for future drought monitoring. In summary, the proposed indicator can be used for comprehensive characterization and assessment of drought at a certain region.


Asunto(s)
Sequías , Teorema de Bayes , Pakistán , Estaciones del Año , Temperatura
5.
J Environ Manage ; 215: 123-131, 2018 Jun 01.
Artículo en Inglés | MEDLINE | ID: mdl-29567552

RESUMEN

In this work, nitrogen-enriched carbon sheet (NECS) was successfully fabricated by using sodium gluconate as a carbon source via melamine assisted chemical blowing approach. The obtained material exhibits sheet-like morphology with ultra-thin thickness and has a high specific surface area of 604 m2g-1 and high nitrogen contents of 11.2 wt%. The NECS showed an excellent adsorption performance towards the removal of anionic dye Methyl blue (a-Mb). The adsorption of a-Mb onto NECS better fitted the Langmuir isotherm model with the highest adsorption capacity of 847 mg g-1. Interestingly, the NECS showed a pH-sensitive behavior towards the adsorption efficiency of a-Mb dye in which the adsorption capacity abruptly increased from 34 to 701 mg g-1 when the pH of the solution was decreased from 10 to 2. Furthermore, the adsorbed materials can be easily regenerated without obvious efficiency loss over a five adsorption-desorption cycles.


Asunto(s)
Bencenosulfonatos/química , Carbono , Contaminantes Químicos del Agua/química , Adsorción , Bencenosulfonatos/aislamiento & purificación , Cinética , Azul de Metileno , Nitrógeno , Contaminantes Químicos del Agua/aislamiento & purificación , Purificación del Agua
6.
Pak J Pharm Sci ; 31(5): 1975-1983, 2018 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-30150197

RESUMEN

Adhatoda vasica and Calotropis procera species were investigated as a resource for new diverse pharmacological agents including B complex, individual total phenolic compounds and antioxidants for curing and treatments of many infectious diseases in human through advanced analytical methods. These plants are abundant in Khyber Pukhtoon Khawa, Pakistan as well as in all over the world and famous for their unique medicinal importance. These herbaceous species are so far used for animals curing while current exploration of these species showed that these species are a precious resource of various compounds which can be employed in the formation of different drugs. The results showed that the leaf and flower extracts of Adhatoda vasica and leaf extract of Calotropis procera contained higher contents of bioactive compounds. The chemical analysis of the samples resulted in higher values of total phenolic compounds (71.32mg GAE/g), total antioxidants (651% DPPH inhibition), the enzyme catalase (4716µg/g), ash content (16.72%) and pH values in the Calotropis procera, whereas the total carotenoids (1987mg/100g), the enzymes, superoxide dismutase (4566µg/g) and peroxidase (1322µg/g) were higher in leaves of Adhatoda vasica. The flower extract of the Adhatoda vasica was rich in the flavonoids (0.87mg/100g) and organic matter (89.99%) as compared to Calotropis procera. The obtained data for each parameter was interpreted by applying Complete Randomized Design (CRD) along with factorial arrangements. The mean comparison was performed using LSD test at 5% probability level. The presence of these phytochemicals may lead to the conclusion that these herbal plants have the potential for formation of new drugs and can be used as herbal medicine for treatment of different cancer and viral diseases. These compounds are also useful in the treatment of the tumor.


Asunto(s)
Acanthaceae , Antineoplásicos Fitogénicos/análisis , Antioxidantes/análisis , Antivirales/análisis , Calotropis , Extractos Vegetales/análisis , Antineoplásicos Fitogénicos/farmacología , Antioxidantes/farmacología , Antivirales/farmacología , Productos Biológicos/análisis , Productos Biológicos/farmacología , Humanos , Extractos Vegetales/farmacología
7.
J Ayub Med Coll Abbottabad ; 29(1): 30-32, 2017.
Artículo en Inglés | MEDLINE | ID: mdl-28712168

RESUMEN

BACKGROUND: Posterior urethral valve (PUV) is life-threatening congenital anomaly of the urinary tract that results in vesicoureteric reflux, recurrent UTI, voiding dysfunction and renal insufficiency if not treat timely. Endoscopic ablation of posterior urethral valves using cold knife or laser is the current gold standard therapy. Many urologists go for repeat cystoscopy to see residual valve or stricture while others repeat VCUG to measure the posterior to anterior urethral ratio for residual obstruction. In this study, we have standardized by regularly doing re-look cystoscopy at 3 months whether the child is symptomatic or not to see justification for re-look cystoscopy after PUV ablation. METHODS: In this prospective study, first 50 cases that underwent posterior urethral valve fulguration were included. Diagnosis of posterior urethral valve was made by voiding symptoms, ultrasonography and confirmed by voiding cysto-urethrogram (VCUG). All children were treated by endoscopic fulguration of posterior urethral valves (PUV) using cold knife as urethral valvotome and were followed clinically for voiding symptoms and with ultrasonography and laboratory test at 3 and 6 months. All patients underwent re-look cystoscopy at three months to see residual valves irrespective of their clinical improvement. RESULTS: Mean age at presentation was 4.9±3.2 years. The most common symptoms were poor stream (76%), straining at voiding (72%), dribbling of urine (54%), fever (42%) and urinary retention (14%). Residual valves on re-look cystoscopy were seen in 78%. Four (8%) patients had urethral stricture on re-look cystoscopy. CONCLUSIONS: We suggest routine re-look cystoscopy after primary fulguration of PUV to pick more residual obstructive valves.


Asunto(s)
Cistoscopía , Electrocoagulación , Reoperación , Estrechez Uretral , Niño , Preescolar , Humanos , Estudios Prospectivos , Uretra/fisiopatología , Uretra/cirugía , Estrechez Uretral/fisiopatología , Estrechez Uretral/cirugía
8.
BMC Musculoskelet Disord ; 17: 54, 2016 Feb 02.
Artículo en Inglés | MEDLINE | ID: mdl-26832148

RESUMEN

BACKGROUND: The aim of this study was to examine whether cartilage volume as measured by MRI and radiographic osteoarthritis (OA) at baseline predict cartilage volume loss over ten years independent of each other and other structural co-pathologies. METHODS: 219 participants [mean-age 45(26-61); 57 % female] were studied at baseline and ten years. Approximately half were the adult offspring of subjects who underwent knee replacement for OA and the remainder were randomly selected controls. Joint space narrowing (JSN) and osteophytes were assessed on radiographs and cartilage volume (tibiofemoral), cartilage defects, bone marrow lesions and meniscal tears/extrusion were assessed on MRI. RESULTS: Mean absolute and percentage per annum cartilage volume loss was 1284 mm(3) and 1.91 % respectively in the medial compartment and 1007 mm(3) and 1.38 % respectively in the lateral compartment. Higher baseline tibiofemoral cartilage volume was independently associated with greater absolute cartilage volume loss in both medial (ß(95 % CI) = -300 (-399,-200)) and lateral (ß = -338 (-443,-233)) compartments and percentage per annum loss in the lateral compartment(ß = -0.15 (-0.29, -0.01)). Baseline JSN and osteophytes were associated with cartilage volume loss in the univariable analysis, however these associations did not persist after adjustment for other structural co-pathologies. CONCLUSION: Cross-sectional cartilage volume measurement independently predicts cartilage volume loss over 10 years and can be used to identify fast progressors in clinical trials. Radiographic JSN and osteophytes on the other hand are a reflection of other co-pathologies assessed on MRI and do not independently predict cartilage volume loss over 10 years.


Asunto(s)
Cartílago Articular/diagnóstico por imagen , Cartílago Articular/patología , Articulación de la Rodilla/diagnóstico por imagen , Articulación de la Rodilla/patología , Imagen por Resonancia Magnética , Osteoartritis de la Rodilla/diagnóstico , Adulto , Artroplastia de Reemplazo de Rodilla , Cartílago Articular/cirugía , Estudios de Casos y Controles , Progresión de la Enfermedad , Femenino , Humanos , Articulación de la Rodilla/cirugía , Estudios Longitudinales , Masculino , Persona de Mediana Edad , Osteoartritis de la Rodilla/diagnóstico por imagen , Osteoartritis de la Rodilla/patología , Osteoartritis de la Rodilla/cirugía , Valor Predictivo de las Pruebas , Pronóstico , Factores de Riesgo , Factores de Tiempo
9.
BMC Musculoskelet Disord ; 17: 4, 2016 Jan 05.
Artículo en Inglés | MEDLINE | ID: mdl-26728980

RESUMEN

BACKGROUND: There is limited longitudinal data available on the natural history of meniscal tears especially in middle-aged adults with a low prevalence of osteoarthritis (OA). The aim of this study was to describe the natural history of meniscal tears over 8 years and the relationship with change in knee pain and structures. METHODS: One hundred ninety eight participants [mean age 47 (28-63); 57% female] were studied at baseline and 8 years later. Approximately half were the adult offspring of subjects who had a knee replacement performed for knee OA and the remainder were randomly selected controls. Meniscal tears/extrusion, cartilage volume/defects, bone marrow lesions (BMLs) and effusion were assessed on MRI. Knee pain was assessed using the Western Ontario and McMaster Universities Osteoarthritis Index. RESULTS: 22% of the participants had at least one meniscal tear at any site at baseline. Over 8 years, 16% of the participants had an increase in severity of meniscal tears while none improved. Increase in meniscal tear score was associated with worsening knee pain (ß = +2.81 (+1.40, +4.22)), with offspring having a significantly greater increase in pain severity compared to controls. BMI and presence of osteophytes at baseline, but not knee injury, predicted change in tears, whereas change in meniscal tears was independently associated with cartilage volume loss, change in BMLs and change in meniscal extrusion. CONCLUSION: Change in meniscal tears shares risk factors with knee OA and is independently associated with worsening knee pain and structural damage suggesting that meniscal tears are on the knee OA causal pathway.


Asunto(s)
Artralgia/diagnóstico por imagen , Meniscos Tibiales/diagnóstico por imagen , Lesiones de Menisco Tibial , Adulto , Artralgia/epidemiología , Estudios de Cohortes , Femenino , Estudios de Seguimiento , Humanos , Estudios Longitudinales , Masculino , Persona de Mediana Edad , Radiografía , Factores de Riesgo , Tasmania/epidemiología , Factores de Tiempo
10.
Pak J Pharm Sci ; 29(5 Suppl): 1839-1846, 2016 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-28476712

RESUMEN

Head and Neck (HN) cancer is the most frequently identified cancer across the globe and is considered as 8-10 % of all cancers in Southeast Asia. The social and cultural habits are the main cause of the remarkable increase in HN cancer in Pakistan. HN cancers are more prevalent in men as compared to women. The HN cancer in Pakistan is mainly attributed to discrete demographic profile, risk elements, eating patterns and family history. The foremost factors of risk are linked with cigarette smoking, alcoholic drinks and tobacco chewing like paan, gutka, etc. The actual burden of HN cancer in Pakistan is 18.74% of all new cancer cases recorded during 2004 -2014. The data is collected from HN cancer patients who are diagnosed from September 2011 till May 2012 in the Institute of Nuclear medicine and Oncology, Lahore Pakistan. In order to diagnose risk factors of HN cancer, the Logistic Regression (LR) and Linear Discriminant Analysis (LDA) are used as analytical tools. The findings of using these both tools concluded that gender, age, occupation, socioeconomic status, family history, chewing habits, smoking habit, worked in the chemical or dust place, alcohol use are main causes for HN cancer. The main aim of this study is to develop the awareness about HN cancer, its causes and early diagnosis.


Asunto(s)
Neoplasias de Cabeza y Cuello/diagnóstico , Neoplasias de Cabeza y Cuello/epidemiología , Adulto , Femenino , Humanos , Masculino , Persona de Mediana Edad , Pakistán/epidemiología , Factores de Riesgo , Tomografía Computarizada por Rayos X
11.
J Ayub Med Coll Abbottabad ; 27(4): 861-4, 2015.
Artículo en Inglés | MEDLINE | ID: mdl-27004340

RESUMEN

BACKGROUND: Vesicoureteral reflux (VUR) is a common anomaly affecting 1-3% of all children and 30-50% of those with urinary tract infection (UTI). In the past febrile vesicoureteric reflux on chronic antibiotic prophylaxis were treated by open surgery. Now a day's endoscopic injection of a bulking material has replaced open surgical procedure in cases of primary VUR. Our objective was to assess the efficacy of endoscopic treatment for primary vesico-ureteric reflux in children. METHODS: This was a descriptive case series. One hundred and five patients with either unilateral or bilateral VUR (181 ureters) underwent endoscopic treatment for primary VUR between January 2011 and January 2014. Children from 1 to 12 years of age with grade-II to IV reflux on preoperative voiding cystourethrogram (VCUG) were enrolled through consecutive non-probability sampling. Efficacy of treatment was evaluated at three months post injection by a standard VCUG. Ureters with no or grade-I reflux were considered successful treatment. RESULTS: Out of 105 patients 76 had bilateral while 29 had unilateral reflux. Mean age was 5.7 years (SD ± .7). Among 181 refluxing ureters, 116 (64%) were free of reflux, while 49 (27%) showed down gradation and 16 (8.8%) showed no response to treatment on postoperative VCUG. CONCLUSION: Endoscopic treatment for VUR is a viable option for patients with primary VUR and may be considered in management of such cases.


Asunto(s)
Endoscopía/métodos , Procedimientos Quirúrgicos Urológicos/métodos , Reflujo Vesicoureteral/cirugía , Niño , Preescolar , Femenino , Humanos , Lactante , Masculino
12.
J Ayub Med Coll Abbottabad ; 26(3): 404-5, 2014.
Artículo en Inglés | MEDLINE | ID: mdl-25671959

RESUMEN

Neuroblastoma is one of the commonest malignancy of childhood. Neuroblatoma in horseshoe kidney is an extremely rare condition. There is only one case of this tumour occurring in horseshoe kidney described in the literature. Recently we successfully treated a boy with neuroblastoma in horseshoe kidney.


Asunto(s)
Neoplasias Renales/terapia , Riñón/anomalías , Neuroblastoma/terapia , Antineoplásicos/uso terapéutico , Quimioterapia Adyuvante , Preescolar , Humanos , Neoplasias Renales/diagnóstico , Masculino , Terapia Neoadyuvante , Nefrectomía , Neuroblastoma/diagnóstico
13.
J Ayub Med Coll Abbottabad ; 26(4): 616-7, 2014.
Artículo en Inglés | MEDLINE | ID: mdl-25672199

RESUMEN

Isolated female epispadias without bladder exstrophy is a rare congenital anomaly. Patients present with total or partial urinary incontinence. The diagnosis can only be made on careful genitalia examination by separating the labia majora. That is why it is often missed by most physicians even after being extensively investigated. The physical findings include patulous urethra, flattened mons pubis, and bifid clitoris with lack of anterior labial commissure. In most of the cases, single stage reconstruction of urethra, labia minora and clitoris is enough to achieve urinary continence with cosmetically acceptable genitalia.


Asunto(s)
Epispadias/diagnóstico , Epispadias/cirugía , Niño , Clítoris/cirugía , Femenino , Humanos , Uretra/cirugía , Vulva/cirugía
14.
Cureus ; 16(3): e57178, 2024 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-38681343

RESUMEN

Background Clinical presentation, diagnosis, and treatment of myocarditis in children can be highly challenging, and results can vary greatly. Research on the precise processes of myocardial injury, including the effects of viral infections and newly identified variables like COVID-19, is still underway. Though treatment approaches, such as immunosuppressive therapy, are still debatable, diagnostic methods such as cardiac MRI and biomarkers show promise in improving diagnostic accuracy. The purpose of this study is to describe the spectrum of pediatric acute myocarditis, assess existing therapy approaches, and develop regional guidelines based on the experience of a tertiary care institution.  Methods Children diagnosed with acute myocarditis over a six-month period were included in this retrospective and descriptive hospital-based study. Data on demographics, clinical presentations, diagnostic tests, treatments, and results were gathered and examined. Descriptive statistics, non-parametric tests for categorical variables, and Spearman's correlation tests for continuous data were used in the statistical analysis, with a significance level of p < 0.05.  Results Of the 99 patients included, the mean age was 2.37 years, with males making up the majority (n = 54, 54.55%). Clinical symptoms typically included shortness of breath (n = 998, 99.0%), vomiting (n = 63, 63.6%), and chest pain (n = 6, 6.1%). High levels of troponin I (n = 70, 70.7%), cardiomegaly on a chest X-ray (n = 97, 97.0%), and different degrees of ventricular dysfunction were found in the laboratory and in imaging studies. Methylprednisolone (n = 84, 84.8%) and IV immunoglobulin (n = 54, 54.5%) were the most often used treatment modalities, and there were no appreciable differences in the two treatment groups' outcomes. A weak negative association (Spearman's rho = -0.211, p = 0.036) was found in the correlation study between the administration of methylprednisolone and length of stay (LOS), indicating possible benefits in terms of shortening hospital stays.  Conclusion This research offers a significant understanding of the clinical manifestation, treatment, and complications of acute myocarditis in children. Methylprednisolone administration seems to be linked to a shorter length of stay (LOS), despite disagreements over treatment approaches. To confirm these results and provide guidance for evidence-based management guidelines for pediatric myocarditis in our setup, more studies are necessary.

15.
Dose Response ; 22(2): 15593258241247185, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38617389

RESUMEN

Background: Caffeine citrate (CC)-induced excessive energy expenditure, diuresis, natriuresis, and other CC-associated potential side effects (CC-APSEs) result in lower daily weight gain (WG) in premature neonates. This study aimed to assess higher CC-doses' effect on the mean daily-WG (MD-WG) and CC-APSE development, considering 5 mg/kg/day as the standard regimen. Method: This retrospective cohort study included neonates of ≤36 weeks gestational age and received CC-therapy. The same participants were followed for data analysis in two postnatal phases: 15-28 and 29-42 days of life (DOL). Based on daily CC-dose, formed group-I=(5 mg/kg/day), group-II=(>5-7 mg/kg/day), and group-III=(>7 mg/kg/day). Data was analyzed separately for group-II and group-III using group-I as the standard. Results: The study included 284 neonates. During phase-I, the MD-WG was significantly higher in group-I than group-II (19.9 ± .88 g/kg/d vs 17.5 ± .49, P = .031) and group-III (19.9 ± .88 g/kg/d vs 16.7 ± .71, P < .001). During 29-42 DOL, the MD-WG of group-I was only significantly higher than group-III (21.5 ± .42 g/kg/d vs 18.1 ± .39 g/kg/d, P = .003) and comparable with group-II. During 15-28 DOL, CC-APSEs were significantly higher in group-II and group-III but during 29-42 DOL was significant only in group-III. Conclusion: Exposure to higher caffeine doses in this study cohort is associated with lower postnatal WG in preterm neonates than standard daily doses may be due to its catabolic effects and CC-APSEs.

16.
Chem Asian J ; : e202300593, 2023 Oct 03.
Artículo en Inglés | MEDLINE | ID: mdl-37787825

RESUMEN

The rapid advancement of refined nanostructures and nanotechnologies offers significant potential to boost research activities in hydrogen storage. Recent innovations in hydrogen storage have centered on nanostructured materials, highlighting their effectiveness in molecular hydrogen storage, chemical storage, and as nanoconfined hydride supports. Emphasizing the importance of exploring ultra-high-surface-area nanoporous materials and metals, we advocate for their mechanical stability, rigidity, and high hydride loading capacities to enhance hydrogen storage efficiency. Despite the evident benefits of nanostructured materials in hydrogen storage, we also address the existing challenges and future research directions in this domain. Recent progress in creating intricate nanostructures has had a notable positive impact on the field of hydrogen storage, particularly in the realm of storing molecular hydrogen, where these nanostructured materials are primarily utilized.

17.
Cureus ; 15(2): e35209, 2023 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-36968943

RESUMEN

OBJECTIVE: To identify the frequency of congenital heart disease (CHD) in various Khyber Pakhtunkhwa (KPK) divisions. MATERIALS AND METHODS: To perform this research, we reviewed the medical records of pediatric cardiology patients hospitalized between January 2022 and July 2022. Data was taken from the cardiology department's computerized data system between January 1 and July 31, 2022. To prevent any errors in diagnosis and address them during input by the ward clerk, patients' addresses, diagnoses, and gender were verified with the computerized medical record. Data were analyzed, and frequency and percentages were calculated. Per the digital mapping of KPK districts, we stratified and examined the data among various KPK divisions. RESULTS: Out Of the 371 patients with CHD who were admitted, 36.98% (137) were from the Peshawar division, 28.84% (107) from the Malakand division, 16.71% (62) from the Mardan division, 6.1% (23) from the Kohat division, 4.3% (16) from the Bannu division, 3.5% (13) from the Dera Ismail Khan division, and 3.5% (13) from the Hazara division. A total of 371 had CHD, of which 234 (63.07%) were cyanotic and 137 (36.92%) were cyanotic. The most prevalent acynotic congenital heart defect was patent ductus arteriosus (PDA) at 36.32% (85), followed by a ventricular septal defect (VSD) at 35.04 (82). The most frequent acyanotic congenital cardiac abnormality was tetralogy of Fallot (TOF) at 49.63% (68), which was followed by transposition of the great arteries (TGA) at 33.57% (46). CONCLUSION: In KPK, congenital heart disease is most prevalent in the divisions of Peshawar and Malakand, while it is least prevalent in Hazara.

18.
Chem Asian J ; : e202300641, 2023 Sep 23.
Artículo en Inglés | MEDLINE | ID: mdl-37740712

RESUMEN

As energy demand continues to rise and the global population steadily grows, there is a growing interest in exploring alternative, clean, and renewable energy sources. The search for alternatives, such as green hydrogen, as both a fuel and an industrial feedstock, is intensifying. Methane steam reforming (MSR) has long been considered a primary method for hydrogen production, despite its numerous advantages, the activity and stability of the conventional Ni catalysts are major concerns due to carbon formation and metal sintering at high temperatures, posing significant drawbacks to the process. In recent years, significant attention has been given to bimetallic catalysts as a potential solution to overcome the challenges associated with methane steam reforming. Thus, this review focuses on the recent advancements in bimetallic catalysts for hydrogen production through methane steam reforming. The review explores various aspects including reactor type, catalyst selection, and the impact of different operating parameters such as reaction temperature, pressure, feed composition, reactor configuration, and feed and sweep gas flow rates. The analysis and discussion revolve around key performance indicators such as methane conversion, hydrogen recovery, and hydrogen yield.

19.
Cureus ; 14(1): e21577, 2022 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-35228936

RESUMEN

Objective The objective is to share our experience of trans-catheter device closure of patent ductus arteriosus (PDA) and review its efficacy and immediate complications. Methodology This cross-sectional observational study was done in the Department of Pediatric cardiology, Lady Reading Hospital, Peshawar from January 2020 to December 2020. A total of 51 patients with isolated PDA, who underwent PDA device closure, were enlisted in this study through consecutive sampling methods, irrespective of their age and gender. Data of the patients were collected on preformed pro forma. Data was entered in SPSS 20 (SPSS Inc., Chicago, IL, USA). Descriptive statistics like mean ± SD for numerical data (age, weight, and hospital stay), while frequency and percentage for categorical variables (Device type, complication, hospital stay, and type of anesthesia given) were calculated. Results Among total 51 patients (33 [64.7%] females and 18 [35.3%] males) with mean age 8.19 ± 6.96 years underwent attempted trans-catheter PDA device closure. In all cases PDA was successfully occluded with appropriate size devices. General anesthesia was given in 38 (74.5%) patients. Complications occurred in only four (7.8%) patients in the form of hemolysis followed by acute kidney injury in one patient, another had device embolization to descending aorta, which was retrieved in cath lab, one had device embolization to the right pulmonary artery, which was retrieved in cath lab and one had mild left ventricular systolic dysfunction. The mean duration of hospital stay was 22.0 ± 10.2 h. Conclusion Trans-catheter PDA device closure is a safe procedure with a high success rate and little morbidity.

20.
PeerJ ; 10: e13377, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-35529496

RESUMEN

The Standardized Precipitation Index (SPI) is a vital component of meteorological drought. Several researchers have been using SPI in their studies to develop new methodologies for drought assessment, monitoring, and forecasting. However, it is challenging for SPI to provide quick and comprehensive information about precipitation deficits and drought probability in a homogenous environment. This study proposes a Regional Intensive Continuous Drought Probability Monitoring System (RICDPMS) for obtaining quick and comprehensive information regarding the drought probability and the temporal evolution of the droughts at the regional level. The RICDPMS is based on Monte Carlo Feature Selection (MCFS), steady-state probabilities, and copulas functions. The MCFS is used for selecting more important stations for the analysis. The main purpose of employing MCFS in certain stations is to minimize the time and resources. The use of MCSF makes RICDPMS efficient for drought monitoring in the selected region. Further, the steady-state probabilities are used to calculate regional precipitation thresholds for selected drought intensities, and bivariate copulas are used for modeling complicated dependence structures as persisting between precipitation at varying time intervals. The RICDPMS is validated on the data collected from six meteorological locations (stations) of the northern area of Pakistan. It is observed that the RICDPMS can monitor the regional drought and provide a better quantitative way to analyze deficits with varying drought intensities in the region. Further, the RICDPMS may be used for drought monitoring and mitigation policies.


Asunto(s)
Sequías , Meteorología , Probabilidad , Pakistán
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