Temat: High Density - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: The effect of silanized halloysite nanotubes on the structure of polyethylene : based composite
Autorzy:: Tatarchuk, Tetiana
Szulc, Joanna
Wieczorek, Martina
Tomaszewska, Jolanta
Skórczewska, Katarzyna
Opis:: Chemical modification of the surface of halloysite nanotubes (HNT) by alkalization (with sodium hydroxide (NaOH)) and grafting with silanes (bis(trimethylsilyl)amine (HMDS)) was carried out. The efficiency of the alkalization and grafting process was evaluated by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and the nitrogen adsorption method were used. XRD and FTIR analysis confirmed the formation of bonds of trimethylsilyl groups to the HNT surface which changed the nature of the surface from hydrophilic to hydrophobic. In addition, it was noted that grafting with silanes decreases by 7.2% the specific surface area of the halloysite compared to the alkalized material. High-density polyethylene (HDPE) composites with halloysite (HNT), alkalized halloysite (alk-HNT), and HMDS-modified halloysite (m-HNT) were processed in the molten state in a Brabender mixer chamber. On SEM/EDS micrographs of HDPE composites with silanized HNT, a change in surface characteristics from smooth to ductile was observed. Higher melting point values based on differential scanning calorimetry (DSC) analysis of HDPE composites with 5%wt silanized halloysite in comparison with HNT and alk-HNT of, respectively, 2.2% and 1.4% were found, which indicates a slight beneficial influence of the filler on the quality of ordering of the crystalline phase of the matrix.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 2.

Tytuł:: A fusion-fission hybrid reactor driven by high-density pinch plasmas
Autorzy:: Zoita, V.
Lungu, S.
Tematy:: CANDU
high-density pinch
hybrid reactor
plasma focus; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/146261.pdf Link otwiera się w nowym oknie
Opis:: A conceptual design for a 200 MW hybrid fusion-fission reactor to be used as a heat source for district heating has been developed. The fission, heat-generating blanket is based on the CANDU reactor technology, while the fusion fast neutrons are provided by a high-density, pinch plasma. The basic assumption regarding the fusion neutron source is that in a pinch plasma (high-density Z-pinch and plasma focus configurations have been considered) a fusion power level of 10 MW can be achieved. An outstanding feature of the design is that no active components are necessary within the reactor containment area, all the hybrid system control being ensured by the fusion component of the reactor.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Wireless at the "Connected Games": How the London 2012 Olympic and Paralympic Games Utilized the Latest Wi-Fi Technology
Autorzy:: Leonhardt, P.
Tematy:: high density Wi-Fi
olympics
paralympics
WiFi
wireless; Pokaż więcej
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/307834.pdf Link otwiera się w nowym oknie
Opis:: The London 2012 Olympic and Paraolympic Games drew together tens of thousands of people in the form of athletes, organisers, media, VIPs, public and many more groups and individuals. With the growth in smart phones and tablets coupled with the ever expanding volume and range of content accessed via Aps and browsers, this huge volume of people expected connectivity from their mobile devices during their time on the Olympic sites. It was BT's role in the games as the official communications services partner to deliver Wi-Fi connectivity across the venues, covering the range of users from the public, athletes, organisers and ticket scanners. This paper examines this state of the art Wi-Fi solution.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Predictive capacity of vitamin D and HDL levels alone and in combination for mortality in critically ill patients
Autorzy:: Singh, Kuldeep
Yadav, Amlendu
Yadav, Rupesh
Kumar, Damera Seshi
Purohit, Ankit
Dahiya, Komal
Kumar, Praveen
Tematy:: Intensive care unit
high-density lipoprotein
mortality
vitamin D; Pokaż więcej
Wydawca:: Towarzystwo Pomocy Doraźnej
Powiązania:: https://bibliotekanauki.pl/articles/55783635.pdf Link otwiera się w nowym oknie
Opis:: INTRODUCTION: Vitamin D and HDL (high density lipoprotein) levels have potential to be used as an early and simple predictor of morbidity and mortality in critically ill patients. The aim of the study was to determine the predictive capacity of vitamin D and HDL levels alone and in combination for mortality in critically ill patients. MATERIALS AND METHODS: Prospective observational study involving 302 patients admitted to an intensive care unit (ICU). Blood samples were obtained within the initial 24 hours of admission to assess vitamin D and HDL levels. Vitamin D levels of >20 ng/ml were considered non-deficient and ≤ 20 ng/mL considered deficient. HDL levels >30 mg/dl were considered normal HDL and <30 mg / dl were considered low HDL. The study collected data on various parameters including the APACHE II score at the ICU admission, SOFA scores throughout the ICU stay, 28-day mortality, as well as the requirement for mechanical ventilation, inotropic support, and renal replacement therapy RESULTS: Of 302 patients, 102 (33.77%) had mortality in 28 days. While analysing the predictive capacity of vitamin D and HDL alone and in combination for mortality at 28 days, the AUC (Area Under the Curve) was 0.667 (95% CI 0.610 TO 0.720), 0.673 (95%CI 0.617 TO 0.725), 0.628 (95% CI 0.571 TO 0.683) respectively. The vitamin D level 12 ng/ml and the HDL level 29 mg/dl were found to have a statistically significant association with mortality. P value <0.001. CONCLUSIONS: The study showed that vitamin D and HDL levels alone and in combination have a significant association with mortality in critically ill patients.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Predictive capacity of vitamin D and HDL levels alone and in combination for mortality in critically ill patients.
Autorzy:: Yadav, Amlendu
Seshi Kumar, Damera
Singh, Kuldeep
Purohit, Ankit
Kumar, Praveen
Dahiya, Komal
Yadav, Rupesh
Wydawca:: Towarzystwo Pomocy Doraźnej
Cytata wydawnicza:: Singh K, Yadav A, Yadav R, Kumar DS, Purohit A, Dahiya K, Kumar P. Predictive capacity of vitamin D and HDL levels alone and in combination for mortality in critically ill patients. Crit. Care Innov. 2024; 7(2): 1-11.
Opis:: INTRODUCTION: Vitamin D and HDL (high density lipoprotein) levels have potential to be used as an early and simple predictor of morbidity and mortality in critically ill patients. The aim of the study was to determine the predictive capacity of vitamin D and HDL levels alone and in combination for mortality in critically ill patients. MATERIALS AND METHODS: Prospective observational study involving 302 patients admitted to an intensive care unit (ICU). Blood samples were obtained within the initial 24 hours of admission to assess vitamin D and HDL levels. Vitamin D levels of >20 ng/ml were considered non-deficient and ≤ 20 ng/mL considered deficient. HDL levels >30 mg/dl were considered normal HDL and <30 mg / dl were considered low HDL. The study collected data on various parameters including the APACHE II score at the ICU admission, SOFA scores throughout the ICU stay, 28-day mortality, as well as the requirement for mechanical ventilation, inotropic support, and renal replacement therapy RESULTS: Of 302 patients, 102 (33.77%) had mortality in 28 days. While analysing the predictive capacity of vitamin D and HDL alone and in combination for mortality at 28 days, the AUC (Area Under the Curve) was 0.667 (95% CI 0.610 TO 0.720), 0.673 (95%CI 0.617 TO 0.725), 0.628 (95% CI 0.571 TO 0.683) respectively. The vitamin D level 12 ng/ml and the HDL level 29 mg/dl were found to have a statistically significant association with mortality. P value <0.001. CONCLUSIONS: The study showed that vitamin D and HDL levels alone and in combination have a significant association with mortality in critically ill patients.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 6.

Tytuł:: The ability of HDL to inhibit VCAM-1 expression and oxidized LDL uptake is impaired in renal patients
Autorzy:: Jurek, Aleksandra
Kubit, Piotr
Turyna, Bohdan
Klein, Andrzej
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 7.

Tytuł:: The association between cardiorespiratory fitness and metabolic syndrome diagnosis: A cross-sectional study in Indonesian middle-aged and older adults
Autorzy:: Arovah, Novita Intan
Heesch, Kristiann C.
Tematy:: abdominal obesity
hyperglycaemia
triglyceride
high density of lipoprotein
hypertension; Pokaż więcej
Wydawca:: PPHU Projack Jacek Wąsik
Powiązania:: https://bibliotekanauki.pl/articles/1933084.pdf Link otwiera się w nowym oknie
Opis:: Objectives: The roles of cardiorespiratory fitness (CF) in reducing cardiovascular disease (CVD) and allcause mortality risks are well established; however, little is known about the role of CF in reducing risk of metabolic syndrome (MetS), a cluster of CVD risk factors, particularly in Asian countries. This research examined associations between CF and MetS diagnosis and its five components in Indonesian middle-aged and older adults. Methods: This cross-sectional study included 161 participants (aged 63±8 years; 70% female). CF was assessed with a 6-minute walk test. MetS diagnosis and its components were assessed with the Adult Treatment Panel III. Logistic regression modelling was conducted to examine the relationships between CF and MetS diagnosis and its components, after adjustment for BMI and other confounders. BMI was categorized using cut-points for Asians. Results: In adjusted models, participants with low CF had a greater likelihood of being diagnosed with MetS than those with high CF (OR=4.79, 95%CI:2.17-10.62). They were also more likely to have low highdensity lipoprotein (OR=2.07, 95%CI:1.02-4.18) or hypertriglyceridemia (OR=2.37, 95%CI:1.15-4.86). There was also borderline significant findings that suggested that participants with low CF had greater likelihood of having abdominal obesity (OR=2.34, 95%CI:0.97-5.65, p=0.06) or hyperglycaemia (OR=2.07 95%CI:0.98-4.41, p=0.06). Conclusions: Low CF is associated with increased likelihood of being diagnosed with MetS. The adverse effects of low CF are mainly characterized by dyslipidaemia. Public health messages should emphasise the importance of improving CF for preventing MetS. Assessment of CF could be useful for targeting individuals most likely to benefit from intervention to prevent MetS.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Development of a Composite Propellant Formulation with a High Performance Index Using a Pressure Casting Technique
Autorzy:: Ramesh, K.
Jawalkar, S. N.
Sachdeva, S.
Bhattacharya, B.
Tematy:: composite propellant
high density
high performance index
pressure casting
solid loading; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Powiązania:: https://bibliotekanauki.pl/articles/358322.pdf Link otwiera się w nowym oknie
Opis:: There is a continuous demand for high performance composite propellant formulations to meet future requirements. The performance of composite propellant formulations can be enhanced by the addition of energetic oxidizers, like ADN/HNF as well as an energetic binder & a plasticizer. However, on incorporation of energetic ingredients, the composition becomes sensitive, and thus processing, handling and transportation pose a greater threat. Therefore, a moderately high burn rate composition having a burn rate ~ 13-14 mmźs -1 at 7000 kPa was tailored by increasing the solid loading of the propellant from 85.15% to 87.27% with the help of ammonium perchlorate and process aids without affecting the burn rate and mechanical properties. The tailored composition was studied for different properties such as end of mix viscosity, density, mechanical & ballistic properties. The evaluated data reveal that the end of mix viscosity of the tailored composition is higher than the base composition, i.e., 672 Paźs and 2340 Paźs at the same temperature; however, this viscosity was castable using a pressure casting technique. The properties of the cured propellant reveal that there is an enhancement of density from 1.74 gźcm -3 to 1.79 gźcm -3 with no other changes in mechanical properties. The performance index of the tailored composition has been increased from 416 to 437, well supported by results of ballistic evaluation motors of 2 kg.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: The properties of Lightweight Stabilised Blockboard panels
Autorzy:: Roziņš, Rihards
Iejavs, Jānis
Jakovļevs, Vilnis
Spulle, Uldis
Tematy:: Lightweight Stabilised Blockboard
physical properties
mechanical properties
high density fibreboard; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Powiązania:: https://bibliotekanauki.pl/articles/2010850.pdf Link otwiera się w nowym oknie
Opis:: Lightweight Stabilised Blockboard (LSB) panel is a product newly introduced onto the market. Research was carried out to determine the main physical and mechanical properties of the panel and to evaluate the effect of panel direction and moisture content. LSB panels have wide potential for application in the furniture industry, door production, transport, and construction board production. Potentially LSB panels are lighter, with lower density and higher form stability than solid wood and conventional fibreboard, particle board, oriented strand board (OSB) and plywood. LSB panels produced from solid pine wood core and High Density Fibreboard (HDF) skins are found to have the following physical properties: average moisture content 8.6%; density 450 kg·m,-3; shrinkage coefficients 0.36% %-1 for thickness and 0.25%·%-1 for length and width; thickness swelling 6.3% after 24 hours’ immersion in water. The following mechanical properties were determined: internal bond 0.51 N mm-2; screw withdrawal resistance 1076 N from plane and 553 N from edge; bending strength 13.4 N mm-2; and modulus of elasticity in static bending 1754 N mm-2.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: The Effects of Calcium Carbonate Filler on HDPE Pipe
Autorzy:: Kherici, Samira
Benouali, Djillali
Nouredine, Chekhar
Tematy:: composite
HDPE
CaCO3
ring stiffness
MFI
high density polyethylene; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/2201739.pdf Link otwiera się w nowym oknie
Opis:: The objective of this work is the preparation and the characterization of high density polyethylene /calcium carbonate (HDPE/CaCO3) composites. Polyethylene composites, containing 10-35 wt. % of CaCO3 and HDPE with MFI (Melt Flow index) (0.550 g/10mn) were prepared with co-extrusion process using extruder type Cincinati 90D. Thermal and mechanical studies were made in order to determine the parameters for obtaining a material (corrugated pipe) with optimal properties. The composite viscosity increased with filler content, suggesting the formation of filler agglomerates. Thermal analysis shows that addition of 30 % CaCO3 increased the thermal stability of HDPE around 32°C, decreasing the processing temperature of composites in 15°C. Regarding to the mechanical tests, the ring stiffness of the composites decreased with the addition of CaCO3. According to the obtained results, we suggest that HDPE/CaCO3 composites could be used in the pipe production where tensile strengths higher than 25 MPa are not required and for service temperatures between 30°C and 70°C.
Dostawca treści:: Biblioteka Nauki

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