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Vasculitis with renal involvement in essential mixed cryoglobulinemia:Case report and mini-review

World Journal of Clinical Cases 2014年第5期2卷 160-166页

作者： Sabiha Anis Khawar Abbas Mohammad Mubarak Ejaz ahmed Sajid Bhatti rana Muzaffar Department of Immunology and Molecular Biology Dewan Farooq Medical ComplexSindh Institute of Urology and TransplantationKarachi 74200Pakistan Department of Histopathology Sindh Institute of Urology and TransplantationKarachi 74200Pakistan Department of Nephrology Sindh Institute of Urology and TransplantationKarachi 74200Pakistan

The discovery of a strong association between hepatitis C virus(HCV) infection and mixed cryoglobulinemia(MC) has led to an increasingly rare diagnosis of idiopathic essential MC(EMC).The incidence of EMC is high in regions where there is a comparatively low HCV infection burden and low in areas of high infection prevalence,including *** diagnosis of EMC requires an extensive laboratory investigation to exclude all possible causes of cryoglobulin *** addition,although cryoglobulin testing is simple,improper testing conditions will result in false negative ***,we present a 46-year-old female patient with a case of EMC with dermatological and renal manifestations,highlighting the importance of extensive investigation to reacha proper *** review the need for appropriate laboratory testing,which is often neglected in clinical practice and which can result in false negative *** review also emphasizes the significance of an extended testing repertoire necessary for better patient *** a strong association of MC with HCV infection and other causes that lead to cryoglobulin formation,EMC remains a separate *** diagnosis requires proper temperature regulation during sample handling,as well as characterization and quantification of the *** of rheumatoid factor activity and complement levels in the cryoglobulin test-panel promotes better patient management and *** guidelines should be developed and implemented for cryoglobulin detection and the diagnosis of cryoglobulinemic syndrome,which will reduce variability in inter-laboratory reporting.

关键词： Cryoglobulin characterization Cryoglobulin detection Essential mixed cryoglobulinemia Cryoglobulinemic glomerulonephritis Hepatitis C virus Renal manifestations

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Wireless Head Gesture Controlled Robotic Wheel Chair for Physically Disable Persons

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Journal of Sensor Technology 2020年第4期10卷 47-59页

作者： Shadman Mahmood Khan Pathan Wasif ahmed Md. Masud rana Md. Shahjalal Tasin Faisul Islam Anika Sultana Department of Mechatronics Rajshahi University of Engineering & Technology Rajshahi Bangladesh Department of Electrical & Electronic Engineering Rajshahi University of Engineering & Technology Rajshahi Bangladesh Department of EEE Rajshahi University of Engineering & Technology Rajshahi Bangladesh

A robotic wheelchair is assumed to be capable of doing tasks like navigation, obstacle detection, etc. using sensors and intelligence. The initial part of the work was development of a cap controlled wheelchair to test and verify the gesture operation. Following that, a real time operating wheelchair was developed consisting of mode changing option between joystick control mode and head gesture control mode as per as the user’s requirement. The wheelchair consists of MPU6050 sensor, joystick module, RF module, battery, dc motor, toggle switch and Arduino. The movement of the head is detected by MPU6050 and the signal is transmitted to the microcontroller. Then the signal is processed by controller and motion of wheelchair is enabled for navigation. The wheelchair was capable of moving left, right, forward and backward direction. The speed of the wheelchair was 4.8 km/h when tested. Design objective of the wheelchair included cost effectiveness without compromising safety, flexibility and mobility for the users.

关键词： Head Gesture Wheel Chair Arduino Motor Driver Joystick Module

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Microstructure and mechanical properties of hot extruded 6016 aluminum alloy/graphite composites

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Journal of Materials Science & Technology 2018年第9期34卷 1580-1591页

作者： Mohamed M.El-Sayed Seleman Mohamed M.Z.ahmed Sabbah Ataya Department of Metallurgical and Materials Engineering Faculty of Petroleum and Mining Engineering Suez University 43518 Suez Egypt Suez and Sinai Metallurgical and Materials Research Center of Scientific Excellence (SSMMR-CSE) 43518 Suez Egypt The British University in Egypt Mechanical Engineering Deportment El-Sherouk City 11837 Cairo Egypt Department of Mechanical Engineering College of Engineering AI Imam Mohammad Ibn Saud Islamic University Riyadh 11432 saudi Arabia

The incorporation of graphite particles into AA6016 aluminum alloy matrix to fabricate metal/ceramic composites is still a great challenge and various parameters should be considered. In this study, dense AA6016 aluminum alloy/（0-20 wt%） graphite composites have successfully been fabricated by powder metallurgy process. At first, the mixed aluminum and graphite powders were cold compacted at 200 MPa and then sintered at 500 ℃ for 1 h followed by hot extrusion at 450 ℃. The influence of ceramic phases（free graphite and in-situ formed carbides） on microstructure, physical and mechanical properties of the produced composites were finally investigated. The results show that the fabricated composites have a relative density of over 98%. SEM observations indicate that the graphite has a good dispersion in the alloy matrix even at high graphite content. Hardness of all the produced composites was higher than that of aluminum alloy matrix. No cracks were observed at strain less than 23% for all hot extruded *** strength, reduction in height, ultimate tensile stress, fracture stress, yield stress, and fracture strain of all Al/graphite composites were determined by high precision second order equations. Both compressive and ultimate tensile strengths have been correlated to microstructure constituents with focusing on the in-situ formed ceramic phases, silicon carbide（SiC） and aluminum carbide（Al4 C3）. The ductile fracture mode of the produced composites became less dominant with increasing free graphite content and in-situ formed carbides. Wear resistance of Al/graphite composites was increased with increasing graphite content. Aluminum/20 wt% graphite composite exhibited superior wear resistance over that of AA6016 aluminum alloy.

关键词： AA6016/graphite composites Hot extrusion In-situ carbides Mechanical properties Wear resistance Fracture behavior

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Relationship between Radiological Lung Findings and Laboratory Ferritin and D-Dimer Levels in Patients with COVID-19 Infection

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International Journal of Clinical Medicine 2022年第10期13卷 468-477页

作者： Mona F. Kardus rana A. Hallak ahmed Alakedi Noha Yusef Sindi Hadeel Abdullah Alhawas Shine Rashed Hessa Al-Twalah Ibrahim Khoja Department of Laboratory Medicine Dr. Sulaiman Al Habib Hospital—ARRYAN Riyadh Saudi Arabia Department of Laboratory Medicine King Saud Medical City Riyadh Saudi Arabia

Introduction: Pulmonary symptoms of COVID-19 infection range from asymptomatic infection to severe pneumonia. Pathogenesis and severity of symptoms were found to be related to the body’s immune response. Objectives: Ferritin and D-Dimer in COVID-19 confirmed cases can predict lung injury and possible poor patient prognosis. Materials and Methods: Patients who had been admitted to Dr. Sulaiman Alhabib-Arryan Hospital with positive COVID-19 polymerase chain reaction (PCR) tests between March 2020 and December 2021 were studied for blood ferritin and D-Dimer levels in relation to pulmonary radiological findings. Results: A total of 494 cases are included in this study. Male patients represent 74.1% of the cases, and the mean age is 51.68 ± 13.37 years. Increased age, ferritin, D-Dimer levels, and respiratory symptoms are factors that showed a statistically significant association with positive computed tomography (CT) findings. Receiver operator characteristic curve (ROC) showed that ferritin has a higher capability than D-Dimer to detect CT findings and that both are equal in predicting possible patient mortality. Suggested cutoff values for Ferritin > 336 ng/mL, with 78.21% sensitivity and 86.42% specificity and for D-Dimer > 0.55 mg/L FEU, with sensitivity of 74.82% and specificity of 75.31%. For mortality, the suggested cutoff point for ferritin is >864.6 ng/mL, which gives a sensitivity of 80.26 and a specificity of 64.83%. The suggested cutoff point for D-Dimer is >1.46 mg/L FEU, which gives a sensitivity of 65.79% and a specificity of 78.23%. Conclusion: Laboratory markers such as Ferritin and D-Dimer can be an accurate predictor of lung injury in COVID-19 patients and their increased values can predict the poor patient prognosis and possible mortality if aggressive hospital care is not provided.

关键词： Ferritin COVID-19 D-Dimer

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Effect of Planting Methods on the Yield and Yield Attributes of Short Duration <i>Aman</i>Rice

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American Journal of Plant Sciences 2014年第3期5卷 251-255页

作者： Md. Masud rana Md. Abdullah Al Mamun Afruz Zahan Md. Nayeem ahmed Md. Abdul Jalil Mridha Adaptive Research Division Bangladesh Rice Research Institute Gazipur Bangladesh Agronomy Division Bangladesh Rice Research Institute Gazipur Bangladesh Soil Science Division Bangladesh Rice Research Institute Gazipur Bangladesh

To find out the effect of planting methods on the yield and yield attributes of short duration Aman rice varieties, a field trial was conducted at the farm of Bangladesh Rice Research Institute, Gazipur, during July to November 2012. The treatments comprised of three BRRI released high yielding varieties viz., BRRI dhan39, BRRI dhan49 and BRRI dhan57 and three planting methods viz., direct seeding of dry seed, direct seeding of sprouted seed and transplanting. It was a factorial experiment conducted in a Randomized Complete Block Design with three replications. Planting methods had a significant effect on the growth duration of rice. The rice crop established with direct seeding of the dry and sprouted seed matured 7 days earlier than transplanting. The variety BRRI dhan39 gave the highest yield (4.964 t·ha-1) when grown with direct seeding of sprouted seed compared to other varieties. The highest net return (23362.00 BDT ha-1) and cost benefit ratio (1:1.49) were observed in direct seeding of the sprouted seed method. So, direct seeding of sprouted seed might be the best planting method because about 19.94% production cost is reduced due to the omission of seedling raising and transplanting operations as well as the reduction in the length of the crop cultivation period.

关键词： Direct Seeding of Dry and Sprouted Seed Growth Duration Short Duration Aman Rice

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Bandgap Saturation in Room Temperature Synthesized Cobalt Doped ZnS Nanoparticles

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材料科学与工程（中英文A版） 2020年第3期10卷 103-110页

作者： Sujan Kumar Das Shahnaj Parvin Ummay Honey MdSohel rana Nasrin Jewena Jahirul IslamKhandaker Farid ahmed Department of Physics Jahangirnagar UniversitySavarDhaka-1342Bangladesh Department of Chemistry Jahangirnagar UniversitySavarDhaka-1342Bangladesh

In this study,cobalt doped ZnS nanoparticles(NPs)have been synthesized by simple chemical precipitation method with six different weight percentages(0.0,0.1,0.3,0.5,0.7 and 1.0%)of cobalt content at room temperature(30°C).X-ray diffraction(XRD)patterns of the samples revealed the formation of cubic structure and calculated particle size were found to be *** band gap values have been obtained from UV-Vis absorption *** has also been found that energy band gap(Eg)increases with the increase in molar concentration of reactant solution and the variation of bandgap was between 5.30-6.01 eV with cobalt doping.

关键词： ZnS nanoparticles cobalt doped bandgap precipitation method

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