The effect of Aluminum on the increasing risk of developing anemia among workers of tile production plants

Background and aims: The aluminum-containing compounds are used as glaze in tile and ceramic production plants. It means that the workers working in these plants are in direct exposure to aluminum-containing compounds. The aim of this study was to assess the potential damages caused by aluminum among tile plant workers. Methods: In this cross-sectional study, 60 workers whom were in direct exposure to glazing material were enrolled as case group and 112 workers whose jobs were different from the case group and who had no exposure to the chemical materials in tile plants were considered as control group. After taking fasting blood samples, it was performed cell count tests using an automated blood cell counter. Serum iron and liver function test were measured using auto analyzer. Serum aluminum measurement was done by graphite furnace atomic absorption spectrometry and ferritin was measured by ELISA. Results: The serum aluminum level was significantly higher in the case group (7.26±2.63) than the control group (5.48±1.75) (P<0.001), as well as the mean hemoglobin level was lower in the case group (14.28±0.88) than the control group (15.44±1.19) (P<0.011). However, the mean level of iron and ferritin as well as liver tests exhibited no significant difference between two groups (P>0.05). Conclusion: Occupational exposure to aluminum in tile production industries could increase the serum aluminum level but may decrease blood hemoglobin concentration, which is a predisposing factor for anemia possibly through intervening in blood iron and ferritin

The effects of dynamic loading on hysteretic behavior of frictional dampers

During an earthquake excitation, a frictional damper may experience many cycles of dynamic loading. The effects of wear and heat induced by the cyclic loading result in the possible decay of the slippage load which subsequently reduce the energy absorption of the damper. In this paper, the effect of dynamic loading on hysteretic behavior of a special kind of frictional damper, namely, cylindrical frictional damper (CFD), is investigated by experimental means as well as numerical models which also account for coupled thermal-structural interaction. The damper is deemed to be more susceptible to thermal deformations due to the shrink-fit mechanism by which the device is assembled. The numerical models are validated experimentally and may be utilized for simulation of dynamic cyclic loading on frictional dampers. The results demonstrate that the slippage load is reduced gradually when subjected to consecutive cycles. This drift is attributed to thermal deformation. The verified numerical models are used to improve the geometry of the CFD. With the geometrical improvements implemented, the subsequent numerical studies confirmed that almost no degradation of the slippage load occurred. Furthermore, a dimensionless parameter is introduced by the authors which shows the effect of wear on the response of CFDs. © 2014 Hamid Rahmani Samani et al

Privacy in Internet of Things: A Model and Protection Framework

AbstractA new form of computation is being evolved to include massive number of diverse set of conventional computing systems, sensors, devices, equipments, software and information services and apps. This new form of computing environment is known as the “Internet-of-Things” (IoT). The adoption of IoT is fast and the “things” are becoming integral part of people day-to-day life as well as essential elements in the businesses everyday activities and processes. Open characteristics of IoT environments raises privacy concern as “things” are autonomous with some degree of authority to sharing their capabilities and knowledge to fulfil their individual or collective tasks. As such privacy becomes central and an inherit computational aspect of the “things”. The work presented here is based on modelling IoT as Cooperative Distributed Systems (CDS). It proposes a novel approach of analysing and modelling privacy concepts and concerns. Privacy protection is captured as a form of “sensitive information” management at the interaction level. A privacy protection management framework for CDS at the interaction level is proposed. The application of the framework has been demonstrated by extending Contract Net Protocol (CNP) to support privacy protection for CDS

Solving inverse problems of unknown contaminant source in groundwater-river integrated systems using a surrogate transport model based optimization

The paper presents a new approach to identify the unknown characteristics (release history and location) of contaminant sources in groundwater, starting from a few concentration observations at monitoring points. An inverse method that combines the forward model and an optimization algorithm is presented. To speed up the computation, the transfer function theory is applied to create a surrogate transport forward model. The performance of the developed approach is evaluated on two case studies (literature and a new one) under different scenarios and measurement error conditions. The literature case study regards a heterogeneous confined aquifer, while the proposed case study was never investigated before, it involves an aquifer-river integrated flow and transport system. In this case, the groundwater contaminant originated from a damaged tank, migrates to a river through the aquifer. The approach, starting from few concentration observations monitored at a downstream river cross-section, accurately estimates the release history at a groundwater contaminant source, even in presence of noise on observations. Moreover, the results show that the methodology is very fast, and can solve the inverse problem in much less computation time in comparison with other existing approaches

Pengaruh Pengelolaan Bengkel Tkr terhadap Pengetahuan, Keterampilan Praktik, dan Motivasi Belajar Siswa di Smk Negeri 1 Sambeng

The aims of this research is to know:1) the effect of workshop automotive management towards knowledge, 2) the effect of workshop automotive management towards practice skills, and 3) the effect of workshop automotive management towards student learning motivation state Vocational High School 1 Sambeng. This is a quasi experiment research. The research method is hypothesis testing on causal relationship between manipulation of independence variable and testing changes that caused of them. The independent variable this research is the management of LWV workshop automotive. However, knowledge, practice skill, and student learning motivation is dependent variables . Data collecting technique by using test item, observation, and questionnaire. Sample of this research are 34 student of X class lightweight vehicle major. Data analysis techniques are using t-test to know the effect of workshop automotive management towards knowledge, practice skills, and student learning motivation state Vocational High School 1 Sambeng. The result of t-test are: (1) there are an effect of LWV workshop automotive management towards student knowledge. This is showed by t-test result is 4,568 with sig. (p) score = 0.000 less then 0.05 , 2) there are an effect to LWV workshop automotive management towards practice skills. This is showed by t-test sore is 5,510 with sign. (p) score = 0.000 less than 0,05, (3) there is an effect of LWV workshop automotive management towards student learning motivation by knowing the result of t-test with numbers -10,91 with sig. (p) score = 0.000 less then 0,05. From the data analyzing it can be conclude that research of LWV workshop automotive management could influence to knowledge, practice skills, and student learning motivation state Vocational High School 1 Sambeng. Keywords : workshop automotive management, practice skills, and students learning motivation J

A sparsity-based method for fault-tolerant manipulation of a redundant robot

As an important part of the manufacturing industry, redundant robots can undertake heavy and tough tasks, which human operators are difficult to sustain. Such onerous and repetitive industrial manipulations, that is, positioning and carrying, impose heavy burdens on the load bearing for redundancy robots' joints. Under the circumstances of long-term and intense industrial operations, joints of redundant robots are conceivably to fall into functional failure, which may possibly cause abrupt joint lock or freeze at unknown time instants. Therefore, task accuracy by end-effectors tends to diminish considerably and gradually because of broken-down joints. In this paper, a sparsity-based method for fault-tolerant motion planning of redundant robots is provided for the first time. The developed fault-tolerant redundancy resolution approach is defined as L1-norm based optimization with immediate variables involved to avoid discontinuity in the dynamic solution process. Meanwhile, those potential faulty joint(s) can be located by the designed fault observer with the proposed fault-diagnosis algorithm. The proposed fault-tolerant motion planning method with fault diagnosis is dynamically optimized by resultant primal dual neural networks with provable convergence. Moreover, the sparsity of joint actuation by the proposed method can be enhanced by around 43.87% and 36.51%, respectively, for tracking circle and square paths. Simulation and experimental findings on a redundant robot (KUKA iiwa) prove the efficacy of the developed defect tolerant approach based on sparsity

Assessing the toxic effects of hydroalcoholic extract of Stachys lavandulifolia Vahl on rat's liver

Aims: Stachys lavandulifolia Vahl is a frequently used plant to treat different diseases, but its probable toxic effects have not been reported yet. This study aimed to study the toxicity of the extract on rats' liver. Methods: In this experimental study, 100 rats were designated into 10 groups and injected normal saline or Stachys lavandulifolia Vahl extract at 50, 100, 150, and 200 mg/kg, intraperitoneally for 28 days. Four case groups and one control group were examined for ALT, AST and ALP after one month and the other groups were evaluated after two months. Results: In the first month, the increase of ALP at all doses and the increase of AST at 200 mg/kg was significant, compared to the control group (p<0.05). In the second month, AST increased at the dosage of 150mg/kg, and ALP decreased at the dosage of 100 mg/kg, compared to the control group (p<0.05). Histopathological assessment showed a significant dose dependent increase both in necrotic-inflammatory reactions and fibrotic lesions, in the first and second months, compared to the control group (p<0.001). Conclusions: The Stachys lavandulifolia extract injected intraperitoneally has hepatotoxic effect, which is not eliminated by the drug withdrawal. Therefore, it is necessary to be consumed with caution (Tab. 4, Fig. 1, Ref 21). Text in PDF www.elis.sk

Children’s body fatness and prevalence of obesity in relation to height for age

Background: Children who are taller for their age tend to have higher BMI, and as a group, a greater prevalence of overweight/obesity. Aim: To examine the relationship between height for age with three measures of adiposity. Subjects and methods: Height, weight, BMI, % body fat (%BF) (by bioimpedance) and waist circumference (WC) were measured in 2298 Caucasian children (1251 boys) aged 4.5 to 14 years. Standard deviation scores (SDS) were derived and cases divided into quartiles of height SDS. Mean BMI, %BF and WC SDSs were compared across quartiles. Prevalence of overweight/obesity, overfat/obesity and abdominal overweight/obesity within each height for age quartile was determined. Results: Mean BMI, %BF and WC SDSs increased with increasing quartile of height SDS. Overweight/obesity, overfat/obesity and abdominal overweight/obesity prevalence increased from the first quartile (8.8-13%) to the fourth quartile (32.7-45.5%) of height SDS. A significant rising trend in mean SDSs for BMI, %BF and WC was also observed with increasing height SDS in overweight/obese children only. Conclusion: A higher prevalence of excess weight, measured by BMI SDS among children taller for their age is replicated when using %BF and WC. Height for age measurement has potential in screening children for later risk of obesity

Effect of Surgical Flap on IL-1β and TGF-β Concentrations in the Gingival Crevicular Fluid of Patients with Moderate to Severe Chronic Periodontitis

Background: Growth factors play a major part in wound healing in many tissues including the periodontium. Transforming growth factor-β1 (TGF-β1) is one of these factors present in the gingival crevicular fluid. In addition, it is considered as one of the most important anti-inflammatory cytokines. Interleukin-1β is a proinflammatory cytokine that presents itself in gingival inflammation and the GCF. Such factors might be of value as prognostic markers of wound healing activity and the therapeutic progress following flap surgery. Objective: The aim of this study was to evaluate the effect of surgical flap on the concentration of IL-1β and TGF-β in the GCF of patients with moderate to severe chronic periodontitis. Methods: The GCF samples were collected, using the Perio-Paper strip at phase 1 (pre-surgery), phase 2 (4th week post surgery) and phase 3 (12th week post surgery) from 20 sites of 10 patients undergoing flap surgery. After the elution, IL-1β and TGF-β concentrations were measured by enzyme-linked immunosorbent assay (ELISA). Results: The mean TGF-β and IL-1β concentration decreased from phase 1 to phase 3 (p<0.05). There were no significant statistical correlations between IL-1β and TGF-β1 concentrations in the 3 assessment phases. There was a significant statistical correlation between TGF-β1 concentrations and the Plaque Index (PI) in phase 2 (p<0.05). There was a significant statistical correlation (p<0.05) between IL-1β and TGF-β1 concentration and the probing pocket depth (PPD). Conclusion: The flap surgery has a significant effect on decreasing IL-1β concentration. In the case of TGF-β1, probably the decrease in the concentration after treatment might be due to the removal of the inflammatory stimulants