Frequency analysis of chatter vibrations in tandem rolling mills

Chatter in high speed tandem mills affects the quality of the product and the production rate of the rolling mill. It may also cause damage to mill components and strip rupture. To monitor chatter generation within the rolling mill, it is highly recommended to use online chatter detecting systems. This paper presents a set of guidelines to optimal control and prevention of chatter in rolling mills. Investigation is based on experimental results of the third octave chatter in a two-stand tandem rolling mill. Online vibration monitoring system that was used has provided different acceleration signals from various components of the rolling stand. Acceleration signals have been analyzed by a vibration analysis toolbox. Frequency analysis and signal processing techniques were used for examining the vibration data. From frequency spectrum analysis it is found that the prominent frequency in the vibration spectrum of the upper backup roll is the most significant one. It is demonstrated that the upper backup roll and top housing are more sensitive to chatter than the work rolls and they are suitable locations for installing the permanent acceleration sensors for chatter warning system

Potential role of a nutraceutical spice (Allium hirtifolium) in reduction of atherosclerotic plaques

Introduction: Spices are now considered as agents that not only can prevent but may even treat chronic diseases. This study was aimed to investigate the effects of Allium hirtifolium as a hypolipidemic and anti-atherosclerotic substance in hypercholesterolemic rabbits. Methods: Twenty four adult New Zealand male rabbits were divided randomly into 3 groups of 8 animals each and treated for 60 days as follows. Normal group received basal feed, while the two intervention groups were fed with hypercholesterolemic diet (1% cholesterol) and hypercholesterolemic diet plus A. hirtifolium extract, respectively. At the start and the end of the experiment, fasting blood was taken from all animals. Serum concentrations of total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), triglycerides (TG), apolipoproteins A and B, serum glutamate oxaloacetate transaminase (SGOT), serum glutamate pyruvate transaminase (SGPT), high-sensitivity C-reactive protein (hs-CRP), glucose and insulin were measured at the end of supplementation period in all studied groups. Atherosclerotic plaque thickness of aorta to media was also determined in all groups. Results: Rabbits fed only with high cholesterol diet showed increased atherosclerotic plaque thickness to media compared to the control group, while the group fed with hypercholesterolemia diet plus A. hirtifolium extract significantly decreased atherosclerotic plaque thickness to media, TC, TG, LDL-C, and significantly increased HDL-C compared to hypercholesterolemic diet group. Supplementation with A. hirtifolium extract did not cause any significant alteration in apolipoproteins, SGOT, SGPT, hs-CRP, glucose and insulin compared to the hypercholesterolemic diet group (p>0.05). Conclusion: Ethanolic extract of A. hirtifolium ameliorates fatty lesions in aorta and may reduce risk factors of cardiovascular disease

Potential role of a nutraceutical spice (<em>Allium hirtifolium</em>) in reduction of atherosclerotic plaques

Introduction: Spices are now considered as agents that not only can prevent but may even treat chronic diseases. This study was aimed to investigate the effects of Allium hirtifolium as a hypolipidemic and anti-atherosclerotic substance in hypercholesterolemic rabbits. Methods: Twenty four adult New Zealand male rabbits were divided randomly into 3 groups of 8 animals each and treated for 60 days as follows. Normal group received basal feed, while the two intervention groups were fed with hypercholesterolemic diet (1 cholesterol) and hypercholesterolemic diet plus A. hirtifolium extract, respectively. At the start and the end of the experiment, fasting blood was taken from all animals. Serum concentrations of total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), triglycerides (TG), apolipoproteins A and B, serum glutamate oxaloacetate transaminase (SGOT), serum glutamate pyruvate transaminase (SGPT), high-sensitivity C-reactive protein (hs-CRP), glucose and insulin were measured at the end of supplementation period in all studied groups. Atherosclerotic plaque thickness of aorta to media was also determined in all groups. Results: Rabbits fed only with high cholesterol diet showed increased atherosclerotic plaque thickness to media compared to the control group, while the group fed with hypercholesterolemia diet plus A. hirtifolium extract significantly decreased atherosclerotic plaque thickness to media, TC, TG, LDL-C, and significantly increased HDL-C compared to hypercholesterolemic diet group. Supplementation with A. hirtifolium extract did not cause any significant alteration in apolipoproteins, SGOT, SGPT, hs-CRP, glucose and insulin compared to the hypercholesterolemic diet group (p&gt;0.05). Conclusion: Ethanolic extract of A. hirtifolium ameliorates fatty lesions in aorta and may reduce risk factors of cardiovascular diseases.</p

Allium hirtifolium Boiss: Radical scavenging property and the lowering effects on blood fibrinogen and factor VII

Enhancement of blood fibrinogen or factor VII increases cardiovascular diseases. Allium hirtifolium Boiss (Mosir) has been shown to have cardioprotective effect. This study, therefore, aimed to evaluate the effects of Allium hirtifolium Boiss on factor VII and fibrinogen blood levels. Its radical scavenging property was also measured. Twenty four NewZealand male rabbits were randomly designated into 3 groups of 8 and were fed for 60 days with normal diet, hypercholestrol (1%) diet or hypercholestrol (1%) diet+Mosir. At the beginning and 60 days after the start of the study, the blood fibrinogen and factor 7 were measured and compared in different groups. The Mosir radical scavenging property was measured using the beta-carotene linoleate method. The blood fibrinogen and factor 7 were higher in hypercholesterolemic group (26.7 +/- 329.22 and 17.1 +/- 277.7mg/dl) compared to normal diet group (13.7 +/- 287.25 and 18.2 +/- 230.0 mg/dl, respectively) (P<0.05), at the end of the experiment. The amount of blood fibrinogen and factor 7 were decreased in hypercholesterol+Mosir group (23.9 +/- 180.00 and 53.3 +/- 237.0 mg/dl) compared to hypercholesterol diet group (P<0.05). radical scavenging activity of Mosir extract was 52.1 +/- 3.3%. Mosir may have beneficial effect on heart by decreasing blood fibrinogen and factor 7 as cardiovascular risk factors. These effects of Mosir should be considered carefully in patients with hemostatic disorders. Asgari. S, Rafieian-kopaei. M, Pourgheysari. B, Ansari-Samani. R, Deris F, Shahinfard. N, Hojjati. MR and Salimi. M. Allium hirtifolium Boiss: Radical scavenging property and the lowering effects on blood fibrinogen and factor VII. Life Sci J 2012;9(3):1793-1798] (ISSN:1097-8135). http://www.lifesciencesite.com. 25

Health risk assessment of heavy metal intake due to fish consumption in the Sistan region, Iran

The heavy metal (Pb, Cd, Cr, and Ni) content of a fish species consumed by the Sistan population and its associated health risk factors were investigated. The mean concentrations of Pb, Cd, and Cr were slightly higher than the standard levels. The Ni content of fish was below the maximum guideline proposed by the US Food and Drug Administration (USFDA). The average estimated weekly intake was significantly below the provisional tolerable intake based on the FAO and WHO standards for all studied metals. The target hazard quotients (THQ) of all metals were below 1, showing an absence of health hazard for the population of Sistan. The combined target hazard quotient for the considered metals was 26.94 × 10â��3. The cancer risk factor for Pb (1.57 × 10â��7) was below the acceptable lifetime carcinogenic risk (10â��5). The results of this study reveal an almost safe level of Pb, Cd, Cr, and Ni contents in the fish consumed by the Sistan population

Antioxidant activity and the lowering effect of hydroalcoholic extract of Allium hirtifolium boisson some haemostatic factors in hypercholesterolemic rabbits

Background and purpose: Hypercholesterolemia and the activity of haemostatic factors may trigger cardiovascular diseases. Allium hirtifolium Boiss (Persian shallot) has been shown to have cardioprotective effects. This study evaluated the effects of A. hirtifoliumon on factor VII and serum fibrinogen levels in hypercholesterolemic rabbits. Also, the antioxidant capacity of A. hirtifolium was measured. Materials and methods: In an experimental study, 24 NewZealand male rabbits were randomly assigned into three groups of eight. The groups' diet which was followed for 60 days included normal diet, hypercholestrol diet (1%) or hypercholestrol diet (1%) + A. hirtifolium. The blood fibrinogen and factor VII were measured pre and post study in all groups. The A. hirtifolium antioxidant capacity was measured using beta-carotene linoleate. Results: The study showed that serum fibrinogen level and factor VII increased significantly in hypercholesterolemic group (329.22 ± 26.7 and 277.7 ± 17.1 mg/dl) compared to normal diet group (287.25 ± 13.7 and 230.0 ± 18.2 mg/dl), respectively (P<0.05). The amount of serum fibrinogen and factor VII decreased in hypercholesterol+A. hirtifolium group (180.0 ± 23.9 and 237.0 ± 53.3 mg/dl) compared to hypercholesterol diet group (P<0.05). The antioxidant capacity of A. hirtifolium extract was 52.1 ± 3.3% in 0.2 g/L. The plasma antioxidant capacity in the group fed with hypercholesterol + A. hirtifolium was 943.907 ± 249.51 µM which was higher compared to that of the normal diet group (629.675 ± 130.73 µM). Conclusion: A. hirtifolium decreases serum fibrinogen level and factor VII, therefore, it might be helpful in reducing risk factors of cardiovascular diseases. These influences are of great importance in patients with haemostatic disorder

Global, regional, and national burden of Alzheimer's disease and other dementias, 1990-2016: a systematic analysis for the Global Burden of Disease Study 2016.

BACKGROUND: The number of individuals living with dementia is increasing, negatively affecting families, communities, and health-care systems around the world. A successful response to these challenges requires an accurate understanding of the dementia disease burden. We aimed to present the first detailed analysis of the global prevalence, mortality, and overall burden of dementia as captured by the Global Burden of Diseases, Injuries, and Risk Factors (GBD) Study 2016, and highlight the most important messages for clinicians and neurologists. METHODS: GBD 2016 obtained data on dementia from vital registration systems, published scientific literature and surveys, and data from health-service encounters on deaths, excess mortality, prevalence, and incidence from 195 countries and territories from 1990 to 2016, through systematic review and additional data-seeking efforts. To correct for differences in cause of death coding across time and locations, we modelled mortality due to dementia using prevalence data and estimates of excess mortality derived from countries that were most likely to code deaths to dementia relative to prevalence. Data were analysed by standardised methods to estimate deaths, prevalence, years of life lost (YLLs), years of life lived with disability (YLDs), and disability-adjusted life-years (DALYs; computed as the sum of YLLs and YLDs), and the fractions of these metrics that were attributable to four risk factors that met GBD criteria for assessment (high body-mass index [BMI], high fasting plasma glucose, smoking, and a diet high in sugar-sweetened beverages). FINDINGS: In 2016, the global number of individuals who lived with dementia was 43·8 million (95% uncertainty interval [UI] 37·8-51·0), increased from 20.2 million (17·4-23·5) in 1990. This increase of 117% (95% UI 114-121) contrasted with a minor increase in age-standardised prevalence of 1·7% (1·0-2·4), from 701 cases (95% UI 602-815) per 100 000 population in 1990 to 712 cases (614-828) per 100 000 population in 2016. More women than men had dementia in 2016 (27·0 million, 95% UI 23·3-31·4, vs 16.8 million, 14.4-19.6), and dementia was the fifth leading cause of death globally, accounting for 2·4 million (95% UI 2·1-2·8) deaths. Overall, 28·8 million (95% UI 24·5-34·0) DALYs were attributed to dementia; 6·4 million (95% UI 3·4-10·5) of these could be attributed to the modifiable GBD risk factors of high BMI, high fasting plasma glucose, smoking, and a high intake of sugar-sweetened beverages. INTERPRETATION: The global number of people living with dementia more than doubled from 1990 to 2016, mainly due to increases in population ageing and growth. Although differences in coding for causes of death and the heterogeneity in case-ascertainment methods constitute major challenges to the estimation of the burden of dementia, future analyses should improve on the methods for the correction of these biases. Until breakthroughs are made in prevention or curative treatment, dementia will constitute an increasing challenge to health-care systems worldwide

Mapping 123 million neonatal, infant and child deaths between 2000 and 2017

Since 2000, many countries have achieved considerable success in improving child survival, but localized progress remains unclear. To inform efforts towards United Nations Sustainable Development Goal 3.2—to end preventable child deaths by 2030—we need consistently estimated data at the subnational level regarding child mortality rates and trends. Here we quantified, for the period 2000–2017, the subnational variation in mortality rates and number of deaths of neonates, infants and children under 5 years of age within 99 low- and middle-income countries using a geostatistical survival model. We estimated that 32% of children under 5 in these countries lived in districts that had attained rates of 25 or fewer child deaths per 1,000 live births by 2017, and that 58% of child deaths between 2000 and 2017 in these countries could have been averted in the absence of geographical inequality. This study enables the identification of high-mortality clusters, patterns of progress and geographical inequalities to inform appropriate investments and implementations that will help to improve the health of all populations