Optimization and analysis of cutting parameters using cryogenic media in machining of high strength alloy steel

In this research, liquid Argon is used as a cryogenic media to optimize the cutting parameters for evaluation of tool flank wear width of Tungsten Carbide Insert (CNMG 120404-WF 4215) while turning high strength alloy steel. Robust design concept of Taguchi L9 (34) method is applied to determine the optimum conditions. This analysis revealed is revealed that cryogenic impact is more significant in reduction of the tool flank wear

Saudi Cement Industry - A Comparative Study of Profitability Position during Economic Slowdown

Infrastructure is one of the favorite projects of every developed and developing nation. Construction industry occupies a prominent place in the infrastructure development of a country. Cement is one the elementary material components in the construction industry. Saudi Arabia has shown a weaker performance in generation of revenue over a period of five years from 2015 to 2019. In a situation of economic slowdown it becomes a challenge for the business concerns to maintain their profitability. The present study is designed to analyze and compare the profitability position of cement companies in the kingdom of Saudi Arabia during this period. The study belongs to top five cement companies in terms of market value and revenue generation in the kingdom of Saudi Arabia. To measure the profitability gross profit ratio, operating ratio, operating profit ratio, net profit ratio and return on investment have been used as variables. One way anova has been used to test the hypotheses. The study shows that these companies do not differ significantly from one another in terms of gross profit, operating profit and net profit but they differ significantly when return on investment is compared. Cement companies can increase their profitability by improving the components of those ratios that have been the cause of decline in profitability

CpG methylation of the FHIT, FANCF, cyclin-D2, BRCA2 and RUNX3 genes in Granulosa cell tumors (GCTs) of ovarian origin

BACKGROUND: Granulosa cell tumors (GCTs) are relatively rare and are subtypes of the sex-cord stromal neoplasms. Methylation induced silencing in the promoters of genes such as tumor suppressor genes, DNA repair genes and pro-apoptotic genes is recognised as a critical factor in cancer development. METHODS: We examined the role of promoter hypermethylation, an epigenetic alteration that is associated with the silencing tumor suppressor genes in human cancer, by studying 5 gene promoters in 25 GCTs cases by methylation specific PCR and RT-PCR. In addition, the compatible tissues (normal tissues distant from lesion) from three non-astrocytoma patients were also included as the control. RESULTS: Frequencies of methylation in GCTs were 7/25 (28 % for FHIT), 6/25 (24% for FNACF), 3/25 (12% for Cyclin D2), 1/25 (4% for BRCA2) and 14/25 (56%) in RUNX3 genes. Correlation of promoter methylation with clinical characteristics and other genetic changes revealed that overall promoter methylation was higher in more advanced stage of the disease. Promoter methylation was associated with gene silencing in GCT cell lines. Treatment with methylation or histone deacetylation-inhibiting agents resulted in profound reactivation of gene expression. CONCLUSIONS: These results may have implications in better understanding the underlying epigenetic mechanisms in GCT development, provide prognostic indicators, and identify important gene targets for treatment

BREAST CANCER DIAGNOSIS USING WRAPPER-BASED FEATURE SELECTION AND ARTIFICIAL NEURAL NETWORK

Breast cancer is commonest type of cancers among women. Early diagnosis plays a significant role in reducing the fatality rate. The main objective of this study is to propose an efficient approach to classify breast cancer tumor into either benign or malignant based on digitized image of a fine needle aspirate (FNA) of a breast mass represented by the Wisconsin Breast Cancer Dataset. Two wrapper-based feature selection methods, namely, sequential forward selection(SFS) and sequential backward selection (SBS) are used to identify the most discriminant features which can contribute to improve the classification performance. The feed forward neural network (FFNN) is used as a classification algorithm. The learning algorithm hyper-parameters are optimized using the grid search process. After selecting the optimal classification model, the data is divided into training set and testing set and the performance was evaluated. The feature space is reduced from nine feature to seven and six features using SFS and SBS respectively. The highest classification accuracy recorded was 99.03% with FFNN using the seven SFS selected features. While accuracy recorded with the six SBS selected features was 98.54%. The obtained results indicate that the proposed approach is effective in terms of feature space reduction leading to better accuracy and efficient classification model

Bleomycin induced pneumonitis: a case successfully managed with high-dose steroids

Bleomycin is a chemotherapeutic agent used in a number of solid organ malignancies.1-3 It accumulates in the skin and lungs resulting in skin ulceration and associated pulmonary toxicity. Its use is somewhat limited due to its significant pulmonary adverse effects with bleomycin induced pnemonitis (BIP) as the commonest and most dreaded complications. The overall incidence of pulmonary toxicity is as high as 10% and it is fatal in 1-2%.3,4 We present a case of BIP which was successfully managed by the aggressive use of high dose steroids with complete resolution

Wegener\u27s granulomatosis: a diagnostic challenge

Wegener\u27s Granulomatosis (WG) is a necrotizing granulomatous vasculitis that primarily involves small vessels in the body. Patient usually presents in the fourth to fifth decade. The clinical presentation is variable; however, majority of patients (90%) seek medical attention for nasal and sinus symptoms with or without lower respiratory symptoms of cough, dyspnoea and haemoptysis. The typical form of WG tends to involve the triad of upper and lower respiratory tract and the kidneys; while involvement of other organs like ocular, cutaneous, rheumatological, neural, gastrointestinal and lower genito-urinary tract is occasionally seen. A limited form with clinical findings isolated to the upper respiratory tract or lungs, occur in approximately one-fourth of cases. We present a case of Wegener\u27s Gmnulomatosis in an eighty five year old lady who presented with an acute pneumonia-like illness. She underwent an extensive work-up to reach a definitive diagnosis

Recent Advances in Decontamination of Chemical Warfare Agents

The recent turmoil and volatile situation in many countries and the increased risk of terrorist activities have raised alarm bells for the field of defense against toxic chemical/materials. These situations poses threats to society as terrorists can take advantage of such situations to strike and cause public mayhem. A number of chemicals have the potential of being used as chemical warfare (CW) agents. CW agents could immediately kill or incapacitate the affected individuals even when they are present in very low concentration. CW agents should be removed quickly to minimize their deleterious health effect. There is no single decontamination system that can be used against all types of chemical warfare (CW) agents. The review briefs about different decontamination processes and approaches for chemical decontamination and also discusses about various decontamination products available globally.Defence Science Journal, 2013, 63(5), pp.487-496, DOI:http://dx.doi.org/10.14429/dsj.63.288

Entrapment of medial plantar nerve [tarsal tunnel syndrome] in type 2 diabetes mellitus: An electrophysiological study

AbstractBackgroundWith increase in type 2 diabetes mellitus patients the complications of diabetes are being seen more frequently. Patients with diabetic neuropathy often present with distressing symptoms such as pain and burning sensation in the feet. Tarsal tunnel syndrome with electrophysiological changes may be a causative or contributing factor. The present study was designed to assess the presence and features of tarsal tunnel syndrome in diabetes mellitus patients.MethodIn this study a group of 10 normal volunteers were selected who had no neurological complaints or foot trauma. Another group of 33 patients having longstanding diabetes mellitus with complaints of pain, burning sensation and paraesthesia in the feet were selected for electrophysiological tests and median plantar nerve was studied.ResultsIn the present study we observed that 15 (45%) of diabetic cases showed abnormal findings e.g., prolonged distal motor latency, decreased amplitude of M-response, low or absent sensory response suggesting tarsal tunnel syndrome.ConclusionThis study shows that the tarsal tunnel syndrome may be present in a significant number of diabetic patients with subjective neuropathic symptoms in the feet. The tarsal tunnel syndrome should be kept in mind during the diagnostic workup and management of diabetes mellitus