Comparative Study of Perforated RF MEMS Switch

AbstractMEMS are the Micro Electronic mechanical system or in general terms it is also known as Micro electronic mechanical switch. MEMS have classified in two types of switch that is series switch and shunt switch .The cantilever is a series type switch whereas the fixed- fixed beam is shunt type switch. Fixed- Fixed beam is the element that is fixed at both anchor ends. The electrostatic actuation process occurs on the switch due to which switch deflects from its original position. The stiction problem occurs in MEMS switches which have been reduced by the proposed design. The perforation is used to reduce the squeeze film damping by decreasing the mass of the switch. As the voltage increases the switch moves to downward z-direction .The displacement is produced in the switch as direction of movement is towards negative z-axis. When the beam contacts with electrode, pull in voltage is achieved. This paper explores the perforation and meander concept with Fixed -fixed switch, which increases the flexibility, low actuation voltage and switching speed. The various types of perforations provide discrete displacement corresponding to voltage. In this paper we represent the design and simulation of Fixed-Fixed switch using perforation of size 2μm-5μm. The electrostatic actuation mechanism is applied on the Fixed-fixed switch which has a serpentine meanders and perforation at different voltages. The switch is designed and simulated by using COMSOL®MULTIPHYSICS 4.3b software

A retrospective study on ectopic pregnancy at tertiary care hospital: a two-year study

Background: Over the last few decades, the incidence of ectopic pregnancy has increased almost to extent of an epidemic disease. The rate of ectopic pregnancy has increased from 0.5% in 1970 to 2% today. The aim of this study was to determine incidence, clinical presentation, risk factor, treatment, morbidity and mortality associated with ectopic pregnancy.Methods: The present retrospective study was conducted over a period of 2 year in department of obstetrics and gynaecology, JMCH, Jhalawar from Jan 2015 to Dec 2017. A total of 64 patients with ectopic pregnancy were analyzed.Results: Total 64 cases of ectopic pregnancy were admitted in this duration and total no. deliveries in these 2 year was 18176. So, incidence of ectopic pregnancy at our institute is 0.35%. Most common presenting complain was pain abdomen (in 93.75%) cases. Classical triad of pain, amenorrhea and bleeding was present in 48.3% cases.Conclusions: Early diagnosis and timely intervention in the form of medical treatment or conservative surgery not only reduces maternal morbidity but also preserves future fertility

Maternal and fetal outcome in emergency versus elective caesarean section

Background: Caesarean section preferred as an emergency or elective procedure are entirely different entities according to measures taken, facilities and skilled staff available and preparation done. It has been shown that risk of surgical complications is greater with emergency compared with elective caesarean section.Methods: Present study is a retrospective study, designed to evaluate maternal and fetal outcomes in elective versus emergency caesarean section performed at our hospital from January 2016 to December 2016.Results: Out of 2156 caesarean, 1628 were emergency and 528 were elective caesarean section.  In our study overall intra operative complications were 11.08% which was mainly contributed to emergency group.Conclusions: The elective caesarean section shows less maternal and perinatal complications as compared to emergency caesarean sections. Increasing incidence of emergency caesarean section can be reduced by encouraging all pregnant females to visit antenatal clinics

Study of effects of negative pressure wound therapy in contaminated wounds

Background: Negative pressure wound therapy is an advanced wound therapy technique that helps in healing the wounds and accelerates granulation tissue as well as wound closure.Methods: Prospective randomized interventional study was done in Dept. of Orthopedics, Dr. BRAM Hospital, Pt. JNM Medical college, Raipur during period from January 2016 to December 2016 involving 25 patients with open fractures up to Gustilo Anderson grade IIIB. All were subjected to this wound technique and response was observed as granulation, size of wound and closure duration.Results: There was up to 10 to 20 mm reduction in wound size with each dressing in half the patients and up to 10 mm in other half of the patients. There was significant reduction in the bacterial growth in all patients and closure was attained in all the subjects after a few therapies.Conclusions: Negative pressure wound therapy is a promising technique to reduce the size of the wound in large wound associated with compound fractures and hasten the healing of wound and its closure

Efficacy and safety of various drugs used for the treatment of nonneurogenic lower urinary tract symptoms in tertiary care hospital

Background: Lower urinary tract symptoms (LUTS) due to benign prostatic hyperplasia (BPH) are common in elder men. Previously surgical treatment was mainstay of treatment of BPH. But now number of drugs alone or combined are clinically used for this disorder. Primary aim was to study the prescribing pattern of different drug therapies and their role in treating LUTS/BPH by evaluating their efficacy and safety in tertiary health care centre.Methods: An observational study including 78 male patients ≥45 years, newly diagnosed with LUTS from April 2014 to May 2015. Patients were followed up every 4 weeks for 3 months after the drug has been prescribed. Efficacy assessment was done on basis of change in IPSS score over 12 weeks. Data was expressed in percentage and Mean ±SD.Results: Mean age of Patients was 64.94 years. Alpha blockers are mainstay prescribed drug either as monotherapy (48.7%) or with 5 alpha reductase inhibitor-dutasteride (38.4%) and with antimuscarinic –Tolterodene (12.8%). Among alpha blockers Tamsulosin (58.97%) was most commonly prescribed, followed by Silodosin (20.5%) and Alfuzosin (20.5%). All drug treatment results in significant improvement with dizziness being the most common adverse event. A subgroup analysis in symptoms was done comparing alpha blockers. All alpha blockers have near about similar efficacy with no significant difference.Conclusions: Alpha blockers are main drugs prescribed in management of LUTS/BPH with near about similar efficacy of all alpha blockers

DStore: Blockchain-Powered Decentralized Cloud Mesh

Data is a critical asset for any company, as well as for any individual as well, but it is also vulnerable to attack. In the last few years, we have seen an alarming increase in data breaches that have compromised millions of accounts and resulted in billions of dollars lost. But how do you protect something so sensitive? In response to this, we propose our Project. This project focuses on developing a Decentralized Cloud Storage to store and secure data. You don't access data simply specifying 'where it is' in Decentralised Cloud Storage. Instead, you define 'what it is'. Because data is distributed throughout a global network rather than being stored in a specific location, the concept of location is rendered obsolete in decentralised cloud storage

A 6G White Paper on Connectivity for Remote Areas

In many places all over the world rural and remote areas lack proper connectivity that has led to increasing digital divide. These areas might have low population density, low incomes, etc., making them less attractive places to invest and operate connectivity networks. 6G could be the first mobile radio generation truly aiming to close the digital divide. However, in order to do so, special requirements and challenges have to be considered since the beginning of the design process. The aim of this white paper is to discuss requirements and challenges and point out related, identified research topics that have to be solved in 6G. This white paper first provides a generic discussion, shows some facts and discusses targets set in international bodies related to rural and remote connectivity and digital divide. Then the paper digs into technical details, i.e., into a solutions space. Each technical section ends with a discussion and then highlights identified 6G challenges and research ideas as a list.Comment: A 6G white paper, 17 page

Effects of combined gate and ohmic recess on GaN HEMTs

AlGaN/GaN, because of their superior material properties, are most suitable semiconductor material for High Electron Mobility Transistors (HEMTs). In this work we investigated the hidden physics behind these materials and studied the effect of recess technology in AlGaN/GaN HEMTs. The device under investigation is simulated for different recess depth using Silvaco-Atlas TCAD. Recess technology improves the performance of AlGaN/GaN HEMTs. We considered three kinds of recess technology gate, ohmic and combination of gate and ohmic. Gate recess improves transconductance gm but it reduces the drain current Id of the device under investigation. Ohmic recess improves the transconductance gm but it introduces leakage current Ig in the device. In order to use AlGaN/GaN for high voltage operation, both the transconductance and the drain current should be reasonably high which is obtained by combining both gate and ohmic recess technologies. A good balance in transconductance and drain current is achieved by combining both gate and ohmic recess technologies without any leakage current