A CFD Study of Industrial Double-Cyclone in HDPE Drying Process

Double-cyclone in fluidized bed drying is an important equipment which reflects the conditions of drying in HDPE slurry process. Cyclone is an important unite of fluidized bed drying in order to move the solid particles outward to its wall. Therefore, flow pattern created in fluidized bed will affect industrial cyclones installed in dryer for dust removing. Pressure drop of the cyclones is an effective parameter represents the drying behavior. Substantially, geometry of cyclone, inlet flow rate of gas, density and particle size distribution (PSD) can affect the pressure drop value. Fluidized bed hydrodynamic regime is very complex and must be understood to improve fluidized bed operations through theoretical, industrial and CFD study of double-cyclone. Pressure drop is introduced as parameter related to the cyclone efficiency can be calculated with ANSYS Fluent software in the Eulerian-Lagrangian framework with RNG k-ɛ turbulence model used as a mathematical method. Proper pressure drop concluded from industrial experiments and CFD calculation shows good fluidization of HDPE particles in the bed of nitrogen and powder  to reach the best fluidized bed situation and suitable quality of HDPE powdery product

Kokcidioza koza: učinci pokusne infekcije na određene krvne pokazatelje.

The objective of this experiment was to elucidate the aspects of differential circulatory cell responses during experimental coccidiosis in goat. A total of twenty newborn kids were selected; ten of them were infected with sporulated oocysts of the most pathogenic species of Eimeria and the remainder served as control. Blood samples were taken at 0 (before inoculation), 3, 7, 14, 17, 21, 24, 28 and 35 days post infection (dpi) and some hematological and fecal related parameters were measured. According to our data, except for a significant decrease at 24 dpi, packed cell volume (PCV) and hemoglobin (Hb) concentrations evidenced no substantial changes in the infected kids compared to controls. The percentage of the circulatory neutrophils showed remarkable increases from 7 to 24 dpi. Unlike neutrophils, the level of lymphocytes represented marked decreases from 7 to 24 dpi. In addition, circulatory eosinophils evidenced no statistical changes during the infection; however monocytes revealed a significant elevation only at 17 and 24 dpi. Substantial activations of neutrophils and lymphocytes indicate that these cells have key roles in either preventing or establishing primary infections with Eimeria in goats.Cilj pokusa bio je rasvijetliti različite odgovore stanica u krvnom optjecaju tijekom pokusno uzrokovane kokcidioze u koza. U pokus je bilo uključeno 20 novoojarene jaradi od čega je 10 bilo zaraženo sporuliranim oocistama najpatogenije vrste roda Eimeria, a ostalih 10 su poslužili za kontrolu. Uzorci njihove krvi bili su uzeti 0. (prije zaražavanja), 3., 7., 14., 17., 21., 24., 28. i 35. dana nakon zaražavanja te su bili pretraženi na neke hematološke pokazatelje. Parazitološki su bili pretraženi i uzorci izmeta. Vrijednosti hematokrita i koncentracije hemoglobina nisu pokazivale bitne promjene u zaraženih u odnosu na kontrolne životinje, osim značajnog smanjenja 24. dana nakon infekcije. Postotak optjecajnih neutrofila bio je značajno povećan od 7. do 24. dana nakon infekcije. Za razliku od neutrofila, razina limfocita bila je znantno smanjena od 7. do 24. dana poslije infekcije. Povrh toga, statistički značajne promjene ustanovljene su u broju optjecajnih eozinofila dok je broj monocita bio značajno povišen 17. i 24. dana nakon infekcije. Znatna aktivacija neutrofila i limfocita upućuju na zaključak da te stanice imaju ključnu ulogu u sprječavanju primarne infekcije kokcidijama roda Eimeria u koza

Model projections on the impact of HCV treatment in the prevention of HCV transmission among people who inject drugs in Europe"

Prevention of hepatitis C virus (HCV) transmission among people who inject drugs (PWID) is critical for eliminating HCV in Europe. We estimated the impact of current and scaled-up HCV treatment with and without scaling up opioid substitution therapy (OST) and needle and syringe programmes (NSPs) across Europe over the next 10 years. We collected data on PWID HCV treatment rates, PWID prevalence, HCV prevalence, OST, and NSP coverage from 11 European settings. We parameterised an HCV transmission model to setting-specific data that project chronic HCV prevalence and incidence among PWID. At baseline, chronic HCV prevalence varied from <25% (Slovenia/Czech Republic) to >55% (Finland/Sweden), and <2% (Amsterdam/Hamburg/Norway/Denmark/Sweden) to 5% (Slovenia/Czech Republic) of chronically infected PWID were treated annually. The current treatment rates using new direct-acting antivirals (DAAs) may achieve observable reductions in chronic prevalence (38-63%) in 10 years in Czech Republic, Slovenia, and Amsterdam. Doubling the HCV treatment rates will reduce prevalence in other sites (12-24%; Belgium/Denmark/Hamburg/Norway/Scotland), but is unlikely to reduce prevalence in Sweden and Finland. Scaling-up OST and NSP to 80% coverage with current treatment rates using DAAs could achieve observable reductions in HCV prevalence (18-79%) in all sites. Using DAAs, Slovenia and Amsterdam are projected to reduce incidence to 2 per 100 person years or less in 10 years. Moderate to substantial increases in the current treatment rates are required to achieve the same impact elsewhere, from 1.4 to 3 times (Czech Republic and France), 5-17 times (France, Scotland, Hamburg, Norway, Denmark, Belgium, and Sweden), to 200 times (Finland). Scaling-up OST and NSP coverage to 80% in all sites reduces treatment scale-up needed by 20-80%. The scale-up of HCV treatment and other interventions is needed in most settings to minimise HCV transmission among PWID in Europe. Measuring the amount of HCV in the population of PWID is uncertain. To reduce HCV infection to minimal levels in Europe will require scale-up of both HCV treatment and other interventions that reduce injecting risk (especially OST and provision of sterile injecting equipment

Industrial challenges of hdpe fluid bed drying in different grades

Saber de los retos en el secado de HDPE es muy esencial para mejorar el proceso. En este trabajo, el polímero en términos de producción con densidades de 940 kg / m3 o superior se produce mediante la técnica de polimerización en suspensión utilizando reactores CSTR. Las materias primas incluyen etileno, hidrógeno, hexano, buteno y catalizador Ziegler-Natta. El producto en suspensión se separa mediante un decantador (20-30% de hexano residual) y un secador de lecho fluidizado de 2 etapas en el que el polvo húmedo se seca adicionalmente hasta un contenido de hexano residual de 0,1%. El proceso de secado aceptable requiere fluidización adecuada. El estudio de este comportamiento hidrodinámico es un trabajo complejo, ya que su comprensión y modelización matemática sigue siendo un reto hasta la fecha y depende en gran medida de la recolección de datos empíricos significativos sobre plantas de procesamiento. El secado de partículas se realiza comúnmente usando secadores de lecho fluidizado en plantas HDPE donde su evaluación de rendimiento depende principalmente del comportamiento de las partículas y del patrón de flujo. Es importante comprender los factores que afectan al régimen de flujo de partículas de gas para alcanzar el proceso con buena eficiencia. Se han empleado comúnmente ciclones dobles para mejorar la separación y evitar que el polvo se transfiera a ubicaciones de plantas vulnerables a lo largo de la trayectoria de secado, incluyendo la placa distribuidora, las bandejas de torre de lavado y los impulsores de sopladores. Esto ayuda a describir los patrones de flujo y reduce aún más la aglomeración de partículas que conduce a un menor consumo de energía en los soplantes. Se investigan diferentes aspectos de los factores que afectan al proceso de secado en la planta capaz de manejar una alimentación húmeda de 56000 kg / h (40000 kg / h de polímero seco de diversos grados incluyendo PE100, BL3 y EX5 y 16000 kg / h de hexano)

Modeling the relationships between perfectionism, achievement emotions and academic well-being among gifted high school students: Testing for gender invariance

The present study examined the mediationg role of positive and negative achievement emotions on the relationship between perfectionism and academic well-being among boy and girl gifted adolescents. In this correlational study, 326 gifted students (161 boy and 165 girl) responded to the Multidimensional Perfectionism Cognitions Inventory (MPCI, Kobori, 2006), the Achievement Emotions Questionnaire- Revised (AEQ-R, Abdollahpour, 1394), the Schoolwork Engagement Inventory (SEI, Salmela-Aro & Upadaya, 2012) and the School Burnout Inventory (SBI, Salmela-Aro, Kiuru, Leskinen & Nurmi, 2009). Results indicated that for total sampel and for boy and girl gifted adolescents, the partially mediated model of positive and negative achievement emotions on the relationship between perfectionism and academic well-being had good fit to data. The results of the group specificity of structural relations showed that the relationship between perfectionism, achievement emotions, academic well-being were equivalent for both groups. All of the regression weights in the global model and for each of the two groups (boy and girl gifted adolescents) were statistically significant. These results consistent with contemporary models of giftedness show that noncognitive concepts such as social/emotional abilities have critical role in prediction of academic functioning of girl and boy gifted high school students

The use of aminoguanidine, a selective inducible nitric oxide synthase inhibitor, to evaluate the role of nitric oxide on periapical healing

Background: Nitric oxide (NO) is one of the many chemical mediators involved in inflammatory processes. In addition to periapical inflammation, NO can have a role in periapical healing. The purpose of this study was to evaluate the effect of aminoguanidine (AG) as a selective inhibitor of inducible nitric oxide synthase (iNOS) on the degree of healing response of periapical lesions of the canine teeth of cats. Methods: In this interventional experimental study, the root canals of 48 cat canine teeth were infected with cat dental plaque and sealed. After induction of periapical lesions, root canal therapy (RCT) was performed. On the day of RCT phase, the cats were administered either AG (experimental group) or normal saline (control group), which was continued on a daily basis until the day of sacrifice. Four canine teeth in one cat served as negative and positive controls. The animals were sacrificed 6 weeks after RCT. The healing response of the periapical zones was analyzed histologically. The mean scores of healing for the two groups were compared using Mann-Whitney U test. Results: The mean scores of healing for the AG group (2.45±0.508) were significantly higher than those of the control group (2±0.510) (P<0.05). Conclusion: The use of an iNOS selective inhibitor such as AG can accelerate the healing process in periapical lesions

Nymphal Linguatulosis in Indian Crested Porcupines (Histrix Indica) in Southwest of Iran

Linguatula serrata is one of the important zoonotic parasites. Carnivores serve as definitive host. The larvae existed in mesenteric lymph nodes (MLNs), liver, lungs, etc of intermediate herbivores. The definitive host becomes infected by ingesting viscera containing the infective nymphal stage. Humans may be infected with Linguatula either by ingestion of nymphs resulting in a condition called nasopharyngeal linguatulosis or Halzoun syndrome or by ingestion of infective eggs which develop in internal organs resulting in visceral linguatulosis. Indian crested porcupine (Hystrix indica) is a common rodent in Middle East. Based on some tradition, consumption of Histrix meat and viscera is common in some parts of Iran. The present study reports the occurrence of Linguatula serrata nymph in H. indica as a new intermediate host from southwest of Iran