Selective Laser Melting of CuSn10: Simulation of Mechanical Properties, Microstructure, and Residual Stresses.

In this study, the evolution of mechanical properties, microstructure, and residual stresses during selective laser melting of CuSn10 components was studied. To provide a proper material model for the simulations, various CuSn10 parts were manufactured using selective laser melting and examined. The manufactured parts were also used to validate the developed model. Subsequently, a sequentially coupled thermal-mechanical FEM model was developed using the Ansys software package. The developed model was able to deliver the mechanical properties, residual stresses, and microstructure of the additively manufactured components. Due to introducing some simplifications to the model, a calibration factor was applied to adjust the simulation results. However, the developed model was validated and showed a good agreement with the experimental results, such as measured residual stresses using the hole drilling method, as well as mechanical properties of manufactured parts. Moreover, the developed material model was used to simulate the microstructure of manufactured CuSn10. A fine-grain microstructure with an average diameter of 19 ± 11 µm and preferred orientation in the Z-direction, which was the assembly direction, was obtained.

Impact of a Stress Management Intervention Program on Sexual Functioning and Stress Reduction in Women with Breast Cancer

Breast cancer as the most common cancer among women endangers various aspects of their sexual lives and is a major culprit regarding health impairment and low life quality. The aim of this study was to examine the effect of a stress management intervention program on sexual functioning and stress reduction in women with breast cancer. This study employed a quasi-experimental pre-test, post-test design which included follow-up checks and a control group. To this end, 104 women with breast cancer referring to Hamadan's Mahdiyeh MRI Center at the time of data collection were conventionally selected in 2015. Using permuted blocks, they were randomly divided into experimental and control groups (n= 52), only the former receiving stress management counseling for 18 hours. Data were collected through a demographic questionnaire, the Female Sexual Function Index (FSFI) questionnaire, and Harry's stress questionnaire, filled out by patients before and after the intervention. To analyze the data, descriptive statistics and two-way ANOVA were used. The results showed that cognitive - behavioral stress management group therapy improved total sexual functioning and its subscales. After the treatment, there was a significant difference in mean scores between the groups (p=0.01). Moreover, significant differences were observed in the mean scores for stress with improvement in the experimental group in post-test results. Cognitive - behavioral group therapy for stress management was thuis found to improve total sexual functioning and its subscales and reduce the level of stress in the experimental group after the intervention and follow-up period with an interval of two weeks. Therefore, this method can be used as a complementary therapy along with medical treatment in oncology centers.

Effect of Marital Relationship Enrichment Program on Marital Satisfaction, Marital Intimacy, and Sexual Satisfaction of Infertile Couples.

BACKGROUND: Infertile couples only think of having children during their sexual intercourse, and their constant concern about this issue increases their stress level. Psychosocial and social stress leads to decreased life satisfaction, increased marital problems, and reduced sexual confidence. This study aims to determine the effect of enrichment program on marital and sexual satisfaction as well as marital intimacy among infertile couples. MATERIALS AND METHODS: This randomized controlled clinical trial was conducted on 50 infertile couples in 2013 in Hamedan. The marital relationship enrichment program was taught to the experimental group during seven 90 minutes sessions. Enrich marital satisfaction, Linda Berg sexual satisfaction, and marital intimacy questionnaires were completed by both groups in 3 pretest steps immediately after the end of training sessions, and 8 weeks later. The results were analyzed in STATA11 software using t test, Chi-square, ANCOVA, RM-ANOVA, and Bonferroni post-hoc test. To check the data normality, Kolmogorov-Smirnov test was used. P<0.05 was considered significant. RESULTS: Comparison of mean scores related to pretest on the one hand and immediately after the test in 8 week later on the other hand showed marital relationship enrichment program significantly increased marital and sexual satisfaction (P<0.001). Also, mean score of marital intimacy immediately after the test (P=0.04) and 8 weeks after the test (P<0.001) significantly increased in comparison with the pretest under the influence of the program. CONCLUSION: Enrichment training can increase marital intimacy and also marital and sexual satisfaction in infertile couples (Registration Number: IRCT201604299014N97).

The influence of occupational heat exposure on cognitive performance and blood level of stress hormones: a field study report.

INTRODUCTION: This article aimed to investigate the effect of heat stress on cognitive performance and the blood concentration of stress hormones among workers of a foundry plant. METHODS: Seventy workers within the exposed (35 people) and unexposed (35 people) groups were studied. The wet bulb globe temperature (WBGT) index was measured for heat stress assessment. The cognitive performance tests were conducted using the Stroop color word test (SCWT) before and during working hours. For the assessment of the serum level of cortisol and the plasma level of adrenaline and noradrenaline, blood samples were taken during working hours from both groups. RESULTS: Only for SCWT III was there a significant relationship between heat stress and test duration, error rate and reaction time. The laboratory test results revealed significantly higher concentrations of cortisol, adrenaline and noradrenaline in the exposed subjects than in the unexposed group. There existed a positive correlation between cortisol, adrenaline, noradrenaline and WBGT index and also test duration and reaction time of SCWT III, and number of errors of SCWT I, SCWT II and SCWT III during work. CONCLUSION: Heat stress can lead to an increase in the blood level of stress hormones, resulting in cognitive performance impairment.

Comparison of Quality of Life, Sexual Satisfaction and Marital Satisfaction between Fertile and Infertile Couples.

BACKGROUND: Fertility plays an important role in sexual and psychological function in families. Infertility can result in major emotional, social, and mental disorders, including a reduction in satisfaction with marital life and quality of life. The present study aimed to compare the quality of life and marital satisfaction and sexual satisfaction between fertile and infertile couples. MATERIALS AND METHODS: This analytical cross-sectional study was conducted on 250 couples at the Fatemiyeh Educational Research Center affiliated to Hamadan University of Medical Sciences, Hamadan, Iran, from May to August in 2014. The subjects were randomly selected from the patients referred to this center using a table of random numbers. They were then allocated into two groups of infertile group (n=125) and fertile group (n=125). The study participants completed World Health Organization Quality of Life-BREF (WHOQOL-BREF) questionnaire, Linda Berg's Sexual Satisfaction Scale, and Enrich Marital Satisfaction Scale. Then, the data were entered into the SPSS version16 for statistical analysis. The Chi-square and Mann-Whitney tests were also applied to compare the data between the groups. RESULTS: The results revealed no significant difference between the two groups regarding demographic and general health variables. The mean scores of sexual satisfaction were 63.67 ± 13.13 and 46.37 ± 7.72 in the fertile and infertile couples, respectively. Furthermore, the mean scores of marital satisfaction were also 44.03 ± 9.36 and 36.20 ± 4.03 in the fertile and infertile groups, respectively. Our finding demonstrated that the fertile couples obtained significantly higher mean scores of quality of life as well as lower mean scores of sexual satisfaction and marital satisfaction as compared to the infertile ones (P<0.001). CONCLUSION: According to the results, the fertile couples obtained significantly higher quality of life and lower sexual satisfaction and marital satisfaction as compared to the infertile ones. Therefore, holding consultation programs and conducting more studies are necessary for improving the quality of life and promoting sexual and marital satisfaction in infertile couples.

Evaluating Effects of Heat Stress on Cognitive Function among Workers in a Hot Industry.

BACKGROUND: Heat stress, as one of the most common occupational health problems, can impair operators' cognitive processes. The aim of this study was to evaluate the impact of thermal stress on cognitive function among workers in a hot industry. METHODS: In this cross-sectional study conducted in Malibel Saipa Company in 2013, workers were assigned into two groups: one group were exposed to heat stress (n=35), working in casting unit and the other group working in machining unit (n=35) with a normal air conditioning. Wet Bulb Globe Temperature was measured at three heights of ankle, abdomen, and head. In order to evaluate the effects of heat stress on attention and reaction time, Stroop tests 1, 2, and 3 were conducted before starting the work and during the work. RESULTS: A significant positive correlation was observed between WBGT and test duration (P=0.01) and reaction time of Stroop test 3 (P=0.047), and between number of errors in Stroop tests 1, 2, and 3, during the work (P= 0.001). Moreover, Stroop test 3 showed a significant higher score for both test duration and reaction time of workers in case group. CONCLUSION: RESULTS of the present study, conducted in a real work environment, confirmed the impairment of cognitive functions, including selective attention and reaction time, under heat stress conditions.

Five-years surveillance of invasive aspergillosis in a university hospital.

BACKGROUND: As the most common invasive fungal infection, invasive aspergillosis (IA) remains a serious complication in immunocompromised patients, leading to increased mortality. Antifungal therapy is expensive and may result in severe adverse effects.The aim of this study was to determine the incidence of invasive aspergillosis (IA) cases in a tertiary care university hospital using a standardized surveillance method. METHODS: All inpatients at our facility were screened for presence of the following parameters: positive microbiological culture, pathologist's diagnosis and antifungal treatment as reported by the hospital pharmacy. Patients fulfilling one or more of these indicators were further reviewed and, if appropriate, classified according to international consensus criteria (EORTC). RESULTS: 704 patients were positive for at least one of the indicators mentioned above. Applying the EORTC criteria, 214 IA cases were detected, of which 56 were proven, 25 probable and 133 possible. 44 of the 81 (54%) proven and probable cases were considered health-care associated. 37 of the proven/probable IA cases had received solid organ transplantation, an additional 8 had undergone stem cell transplantation, and 10 patients were suffering from some type of malignancy. All the other patients in this group were also suffering from severe organic diseases, required long treatment and experienced several clinical complications. 7 of the 56 proven cases would have been missed without autopsy. After the antimycotic prophylaxis regimen was altered, we noticed a significant decrease (p = 0.0004) of IA during the investigation period (2003-2007). CONCLUSION: Solid organ and stem cell transplantation remain important risk factors for IA, but several other types of immunosuppression should also be kept in mind. Clinical diagnosis of IA may be difficult (in this study 13% of all proven cases were diagnosed by autopsy only). Thus, we confirm the importance of IA surveillance in all high-risk patients.

[Acute renal failure and hypercalcemia in an AIDS patient on tenofovir and low-dose vitamin D therapy with immune reconstitution inflammatory syndrome]. / Akutes Nierenversagen und Hyperkalzämie unter tenofovirhaltiger antiretroviraler Therapie bei einer Patientin mit AIDS und Immunrekonstitutionssyndrom nach niedrigdosierter Vitamin-D-Substitution.

BACKGROUND: Tenofovir-containing antiviral therapy might result in acute renal failure and is able to induce tubular dysfunction with hypocalcemia. On the other hand, hypercalcemia induced by intoxication with colecalciferol has been described to induce renal failure in HIV-positive individuals as well. Here, the authors describe the unusual case of reversible renal failure due to hypercalcemia in a patient with low-dose colecalciferol substitution treated with tenofovir. CASE REPORT: A 31-year-old HIV-positive female, CDC stage C3, was admitted to the authors' hospital with progressive renal failure and hypercalcemia. Antiretroviral therapy consisted of tenofovir and emtricitabine in combination with efavirenz. Additionally, she was on low-dose vitamin D(3) substitution (25 microg/d) and calcium supplementation (500 mg/d) due to systemic steroid treatment. CONCLUSION: Additionally to regular control of renal function, serologic level of calcium should be supervised in patients concomitantly treated with tenofovir and colecalciferol.