Polycaprolactone (PCL) is an important polymer due to its mechanical properties, miscibility with a large range of other polymers and biodegradability. Polycaprolactone (PCL) was chosen as the matrix because of its bi...
Polycaprolactone (PCL) is an important polymer due to its mechanical properties, miscibility with a large range of other polymers and biodegradability. Polycaprolactone (PCL) was chosen as the matrix because of its biodegradability characteristics. This paper reports on an investigation of the influence of the presence of bentonite. It was found that of bentonite significantly influenced the mass loss behavior of the nanocomposite because of physical interactions between the clay and the polymer chains and degradation volatiles. Melt drawing of the composite, however, had little influence on the degradation behavior of the investigated samples. Based on mechanical properties results, addition of bentonite significantly enhances the flexibility of PCL blends. TGA showed that the presence of bentonite improves thermal stability of blends.
Blackwater is a type of domestic wastewater that must be processed before discharge into the river. This study uses gravel, sand, and charcoal as filtration materials which arranged from coarse to fine, and also wetla...
Blackwater is a type of domestic wastewater that must be processed before discharge into the river. This study uses gravel, sand, and charcoal as filtration materials which arranged from coarse to fine, and also wetland system using Vetiver grass (Vetiveria zizanioides) and Cattail (Typha angustifolia). The treatment process is obtained by applying different treatments related to the sand thickness and blackwater residence time in the wetland. The focus of observation is emphasized on the measurement of BOD (Biological oxygen demand) and COD (Chemical oxygen demand). Both parameters measured and compared with the standard of water for agricultural purposes (Grade IV) regulated by Indonesian Government. The results showed that stratified filters can reduce the levels of BOD and COD effectively. The final results obtained after blackwater flowed through the wetland tube shows that BOD and COD levels have yet to meet the standard of grade IV water, although the overall result indicated the significant reduction of both parameters. This can be related to the input of organic matter from wetland itself, and it also can be considered an indication that blackwater treatment requires longer residence time.
This study aimed to devisea new design of domestic waste treatment which can produce an output of class IV water (irrigation water) based on measurement of TDS (Total Dissolved Solid) and TSS (Total Suspended Solid) p...
This study aimed to devisea new design of domestic waste treatment which can produce an output of class IV water (irrigation water) based on measurement of TDS (Total Dissolved Solid) and TSS (Total Suspended Solid) parameters. The physical model tested in this research wasa stratified filter consisting of compositionsfrom coarse to fine materialsnamely gravel, charcoal and sand. Furthermore, filtering blackwater waste was refined by remediation with Cattail (Typha Angustifolia) and Vetiver (Vetiveria Zizanoides). The physical model of WWTP was set to 1:25 added by a stratified filter in the upstream section. Observations were done by measuring blackwater TDS levels prior to treatment, after going through a stratified filter, and after going through a remediation process with aquatic plants. The results showed that stratified filters and wetland can reduce TDS levels in blackwater until it reached the standard for irrigation water.
This paper presents a numerical and experimental study of increasing the performance coefficient (COP) of split AC (SAC) by reducing compressor work and increasing cooling capacity. Two phase ejector as an expansion d...
This paper presents a numerical and experimental study of increasing the performance coefficient (COP) of split AC (SAC) by reducing compressor work and increasing cooling capacity. Two phase ejector as an expansion device with a new design of dual evaporator temperature used. numerical methods apply the mathematical model developed in the EES software that is applied. Thermodynamic analysis is carried out to achieve ASHRAE Standard requirements for a minimum SAC with COP application of 3.5. The SAC system is filled with R-290 as a thermal fluid medium. Based on the simulation results a numerical model of the ejector is then produced and installed in a modified SAC system of cooling capacity of at least 9000 BTU/hour. An experimental test was conducted to investigate the actual performance of the ejector and its effect on the performance of the SAC system. The results showed that the two phase ejector with the new design of the dual evaporator temperature system was successful. When compared to standard split air conditioners using capillary tube expansion devices the tested ejector system contributes around 35% of power savings. The COP of the system can reach 5.5 which accounts for 39% of the increase in performance.
The object of this research was aluminum 6061 with 150 mm length, 50 mm wide, and 10 mm thick. The probe utilized is one of with simple design was made from hardened EMS 45. The observed aspect was microstructure in a...
The object of this research was aluminum 6061 with 150 mm length, 50 mm wide, and 10 mm thick. The probe utilized is one of with simple design was made from hardened EMS 45. The observed aspect was microstructure in a specific temperature that would affect of the strength the material. Apart from the microstructure, the observation also covered the macrostructure and the temperature. The analysis of the result also involved several tests including hardness test, x-ray, and tensile test. The determined parameter for this research was the feed rate speed that ranged from 6 mm/min, 8 mm/min, 10 mm/min, 15 mm/min, and 30 mm/min and varied corner joint (Corner-Butt 45, Corner-Butt, and Corner-Lap 45). The rotation speed varied set at 1000 rpm, 1500 rpm, and 2000 rpm. The heat generated, the acquisition data was then calculated. The experiment is highest value of tensile test was 163 MPa, acquired from Corner-Butt joint 45 with 10 mm/min feed rate speed. It was verified by the heat temperature that ranged from 300-420° C and clarified by its micro and macrostructure..
BACKGROUND:Long COVID, an emerging public health issue, is characterized by persistent symptoms following SARS-CoV-2 infection. This study aims to explore the relationship between post-COVID-19 symptomatology and pati...
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BACKGROUND:Long COVID, an emerging public health issue, is characterized by persistent symptoms following SARS-CoV-2 infection. This study aims to explore the relationship between post-COVID-19 symptomatology and patient distress employing Latent Class Analysis to uncover symptom co-occurrence patterns and their association with distress.
METHODS:A cross-sectional study was conducted using an online survey among 240 participants from a university and affiliated hospital of southern Taiwan. The survey quantified distress due to persistent symptoms and assessed the prevalence of Long COVID, symptom co-occurrence, and latent symptom classes. Latent Class Analysis (LCA) identified distinct symptom patterns, and multiple regression models evaluated associations between symptom patterns, distress, and demographic factors.
RESULTS:The study found that 80 % of participants experienced Long COVID, with symptoms persisting for over three months. Individuals with multiple COVID-19 infections showed a significant increase in general (β = 1.79), cardiovascular (β = 0.61), and neuropsychological symptoms (β = 2.18), and higher total distress scores (β = 6.35). Three distinct symptomatology classes were identified: "Diverse", "Mild", and "Severe" symptomatology. The "Mild Symptomatology" class was associated with lower distress (-10.61), while the "Severe Symptomatology" class showed a significantly higher distress due to symptoms (13.32).
CONCLUSION:The study highlights the significant impact of Long COVID on individuals, with distinct patterns of symptomatology and associated distress. It emphasizes the cumulative effect of multiple COVID-19 infections on symptom severity and the importance of tailored care strategies.
Escherichia coli strain LS5218 is a useful host for the production of fatty acid derived products, but the genetics underlying this utility have not been fully investigated. Here, we report the genome sequence of LS52...
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This study aimed to assesses the effect of various commercial Na2SiO3 on the compressive strength (CS) of alkaline activated fly ash mortar (AAFM). The three mixture of alkaline activated mortar (AAM) C1, C2 and C3 we...
This study aimed to assesses the effect of various commercial Na2SiO3 on the compressive strength (CS) of alkaline activated fly ash mortar (AAFM). The three mixture of alkaline activated mortar (AAM) C1, C2 and C3 were prepared from the source material of fly ash and alkaline activator solution (AAS). The initial AAS was comprised of NaOH (10M) and various grade of Na2SiO3. The various grades of Na2SiO3 were characterized by their SiO2/Na2O molar ratio of 2.0, 2.2, and 3.3, respectively. The sample from each mixture was characterized based on the CS and microstructure changes using useful tools of XRD and FTIR analysis. The results obtained indicated that the highest CS achieved among the three mixtures were 48.23MPa of mixture C2 prepared with SiO2/Na2O molar ratio of 2.2. This was mainly due to higher binder formation (N-A-S-H gel type) and a higher rate of reaction of the main source material. This result is in line with XRD and FTIR analysis results finding.
OBJECTIVE:To evaluate the association between human papillomavirus (HPV) infection and the subsequent risk of developing glaucoma using real-world data.DESIGN:Retrospective cohort study.SUBJECTS AND CONTROLS:Adults ag...
OBJECTIVE:To evaluate the association between human papillomavirus (HPV) infection and the subsequent risk of developing glaucoma using real-world data.
DESIGN:Retrospective cohort study.
SUBJECTS AND CONTROLS:Adults aged ≥18 years with a diagnosis of HPV were identified from the TriNetX research network and matched 1:1 to individuals without HPV based on demographics, comorbidities, and healthcare utilization patterns.
METHODS:Propensity score matching was performed to balance baseline characteristics. Cox proportional hazards models were used to estimate the hazard ratios (HRs) for incident glaucoma. Sensitivity analyses and subgroup stratifications were conducted to assess robustness.
MAIN OUTCOME MEASURES:Incident diagnosis of glaucoma, including open-angle and angle-closure subtypes, following HPV infection.
RESULTS:Among 451,288 matched participants, HPV infection was associated with an increased risk of glaucoma (HR: 1.34; 95% CI: 1.28-1.41), with elevated risks observed for both open-angle (HR: 1.33; 95% CI: 1.16-1.52) and angle-closure glaucoma (HR: 1.66; 95% CI: 1.20-2.30). The association was more pronounced in older adults, males, and Asians, and further amplified by comorbidities such as hypertension, diabetes, and myopia. Results were consistent across sensitivity analyses.
CONCLUSION:HPV infection is associated with a higher risk of glaucoma. While these findings highlight a potential need for increased ophthalmologic surveillance in HPV-positive individuals, the possibility of surveillance bias, in which individuals with HPV may receive more frequent healthcare and eye examinations, cannot be excluded. Further studies are warranted to explore causal mechanisms and control for potential confounding.
In synthetic biology,researchers assemble biological components in new ways to produce systems with practical *** of these practical applications is control of the flow of genetic information(from nucleic acid to prot...
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In synthetic biology,researchers assemble biological components in new ways to produce systems with practical *** of these practical applications is control of the flow of genetic information(from nucleic acid to protein),*** *** is critical for optimizing protein(and therefore activity)levels and the subsequent levels of metabolites and other cellular *** central dogma of molecular biology posits that information flow commences with transcription,and accordingly,regulatory tools targeting transcription have received the most attention in synthetic *** this mini-review,we highlight many past successes and summarize the lessons learned in developing tools for controlling *** particular,we focus on engineering studies where promoters and transcription terminators(cis-factors)were directly engineered and/or isolated from DNA *** also review several well-characterized transcription regulators(trans-factors),giving examples of how cis-and trans-acting factors have been combined to create digital and analogue switches for regulating transcription in response to various ***,we provide examples of how engineered transcription control systems have been used in metabolic engineering and more complicated genetic *** most of our mini-review focuses on the well-characterized bacterium Escherichia coli,we also provide several examples of the use of transcription control engineering in non-model *** approaches have been applied outside the bacterial kingdom indicating that the lessons learned from bacterial studies may be generalized for other organisms.
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