Developing highly symmetric Microelectromechanical systems (MEMS) based butterfly gyroscopes

Microelectromechanical systems (MEMS) is the technology combining electrical components with mechanical systems at a micro scale. The combination of these two technologies allowed devices to interact with each other and build complex structures. System on the chips are built with components such as masses, electrodes, anchors, actuators and detectors. Reducing the size, weight, energy usage and cost is key while maintaining the sensors integrity. Sensitivity is an important factor when evaluating a gyroscope’s performance. This research presents beam modeling techniques for maximizing mechanical sensitivity of the butterfly resonator for gyroscopic applications. It investigates the geometric aspects of synchronizing beam that connects the wings of a butterfly resonator. The results show that geometric variation in the synchronizing beam can have a large effect on the frequency split and sensitivity of the device. The model simulation demonstrates a sensitivity of 10e-12 (m/°/sec) for a frequency split of 10 Hz, resulting from the optimized synchronous beam. Out of plane actuation was developed to drive and sense the resonators displacement. A butterfly sensor chip was fabricated to capture the dynamic responses of the resonator and to observe the theoretical and experimental results. Two butterfly resonators were tested, and the experimental results show a frequency split of 305 Hz and 400 Hz, while the model illustrated a split of 195 Hz and 220 Hz, respectively. The design and analysis presented in this thesis can further aid the development of MEMS butterfly resonators for inertial sensing applications

Genetic variability and regression analysis for yield and quality traits in Brassica napus

An experiment was conducted to estimate the genetic variability and regression analysis for yield and quality traits in a set of eight brassica genotypes in a randomized complete block design with three replications at The University of Agriculture Peshawar, during 2011-12 cropping season. Significant genetic variability was recorded among genotypes for plant height, pods main receme-1, pod length, seed yield plant-1, 1000-seed weight, seeds pod-1, oil content, protein content, glucosinolate content, erucic acid content, oleic acid content and linolenic acid content except for primary branch plant-1 and pods plant-1 which showed non-significant differences. Genotypes, AUP-401, AUP-402, AUP-404 and AUP-407 showed potential performance for glucosinolate content (55.1 µmol g-1), seed yield plant-1 (23.93 g), pods plant-1 (268.83), protein contents (21.1 %), erucic acid contents (42.7 %) and oil contents (53.3 %). Seed yield plant-1 was taken as a dependent variable to study the effects of many morphological yield traits on it. Branches plant-1, pods main raceme-1, pods plant-1, and seed pod-1 showed a positive effect on seed yield plant-1, while 1000-seed weight, pod length, and plant height showed a negative effect on seed yield plant-1. Seed yield plant-1 as an independent variable showed a negative effect on oil content. Protein content as an independent variable showed a positive effect on erucic acid content, while oil contents as independent variables show a negative effect on protein contents, respectively. The developed germplasm could be used in the upcoming brassica breeding programs to release high yielding, disease resistance, stress tolerance, and insect resistance varieties, which will eventually upsurge the productivity and decrease the gap between demand and domestic production of the brassica crop

Perceptions and Attitudes of Medical Sales Representatives (MSRs) and Prescribers Regarding Pharmaceutical Sales Promotion and Prescribing Practices in Pakistan

Pakistan is the 6th most populous country in the world and has an enormous potential for an ever increasing drug market. The health care system is highly prone to unethical drug prescribing practices. In addition, there is a huge tendency of pharmaceutical firms to indulge in unethical drug promotional practices by means of inducements and other benefits through their medical sales representatives (MSRs). On the other hand, the prescribers are also reported to be demanding inducements from these companies in return to write higher number of prescription. This study investigated the ground realities of drug promotion and prescribing practices in Pakistan. Materials and Methods: A cross sectional study was conducted for a period of 8 months in which 472 physicians and 609 medical sales representatives of Pakistan selected through prospective sampling were interviewed on a validated, structured questionnaire. The responses of the target groups were then analyzed for association between variables by Chi–square test (p<0.05) and cross tabulation through SPSS, version 20. Results: Majority of practitioners (83.2%) expected both, good communication skills and knowledge from MSRs and at the same time nearly half (53%) of prescribers demanded CME and almost a third proportion (36%) demanded gifts, incentives and inducements from MSRs. Replying to same question, MSRs disagreed with prescribers and believed that around (~70%) of prescribers ask for inducements with a high percentage i.e. (~64%) among them demanding unethical inducements like excessive free samples, gifts, leisure trips and cars. Majority of physicians (92%) have consensus that the multinational pharmaceutical firms have defined promotional practices while the national pharmaceutical companies (~73%) are mainly involved in unethical practices of drug marketing. Conclusion: Majority of national pharmaceuticals as well as prescribers were involved in unethical drug promotion and prescribing respectively. There is a need of curbing the unethical drug promotion and prescribing and formidable policies governing this issue are required to be implemented by the concerned regulatory authorities to avoid unnecessary harm to the patient’s life and pocket. Strength and weakness of study: The study explored the drug promotion and prescribing practices for the first time in a developing country however, due to sensitivity of the topic a number of respondents hesitated to participate

Parametric analysis of wax printing technique for fabricating microfluidic paper-based analytic devices (µPAD) for milk adulteration analysis

Accurate prediction of hydrophobic–hydrophilic channel barriers is essential in the fabrication of paper-based microfluidic devices. This research presents a detailed parametric analysis of wax printing technique for fabricating µPADs. Utilizing commonly used Grade 1 filter paper, experimental results show that the wax spreading in the paper porous structure depends on the initially deposited wax line thickness, a threshold melting temperature and melting time. Initial width of the printed line has a linear relationship with the final width of the barrier; however, a less pronounced effect of temperature was observed. Based on the spreading behavior of the molten wax at different parameters, a generalized regression model has been developed and validated experimentally. The developed model accurately predicts wax spreading in Whatman filter paper: a non-uniform distribution of pores and fibers. Finally, tests were carried out for calorimetric detection of commonly used adulterants present in milk samples

An Efficient Algorithm for Recognition of Human Actions

Recognition of human actions is an emerging need. Various researchers have endeavored to provide a solution to this problem. Some of the current state-of-the-art solutions are either inaccurate or computationally intensive while others require human intervention. In this paper a sufficiently accurate while computationally inexpensive solution is provided for the same problem. Image moments which are translation, rotation, and scale invariant are computed for a frame. A dynamic neural network is used to identify the patterns within the stream of image moments and hence recognize actions. Experiments show that the proposed model performs better than other competitive models

Arsenic speciation and biotransformation pathways in the aquatic ecosystem: The significance of algae

© 2020 Elsevier B.V. The contamination of aquatic systems with arsenic (As) is considered to be an internationally-important health and environmental issue, affecting over 115 countries globally. Arsenic contamination of aquatic ecosystems is a global threat as it can enter the food chain from As-rich water and cause harmful impacts on the humans and other living organisms. Although different factors (e.g., pH, redox potential, iron/manganese oxides, and microbes) control As biogeochemical cycling and speciation in water systems, the significance of algal species in biotransformation of As is poorly understood. The overarching attribute of this review is to briefly elaborate various As sources and its distribution in water bodies and factors affecting As biogeochemical behavior in aqueous ecosystems. This review elucidates the intriguing role of algae in biotransformation/volatilization of As in water bodies under environmentally-relevant conditions. Also, we critically delineate As sorption, uptake, oxidation and reduction pathways of As by algae and their possible role in bioremediation of As-contaminated water (e.g., drinking water, wastewater). The current review provides the updated and useful framework for government and water treatment agencies to implement algae in As remediation programs globally

Prospective elective neurosurgical theater utilization audit in Pakistan: problems in a public tertiary care hospital and proposed solutions from lower-middle-income country

Background: In lower-middle-income countries such as Pakistan, public hospitals provide free healthcare but suffer from poor management and misgovernance, negatively impacting service provision. One aspect of this is operating theater time (OTT) utilization. In a 1,600-bed hospital with a 22 million catchment population, we noticed significant delays and inadequate OTT efficiency at the neurosurgery department of Jinnah Hospital, Lahore, Punjab, Pakistan. This audit aimed to analyze the neurosurgical OTT utilization, identify delays, and highlight managerial deficiencies and areas for improvement while comparing our workflow with contemporary international literature. Materials and Methods: We prospectively audited OTT utilization at the neurosurgical department. All elective surgeries from January to April 2021 were included to identify delays concerning patient transfer, anesthesia team arrival, preparation and intubation time, operative time, and anesthesia extubation time. Results: Fifty-six per cent of OTT was utilized operating. Sources of delay included the delayed arrival of anesthesia team (4.7%) and the delay in transferring patients to OT (9.7%). Anesthesia intubation and preparation time accounted for 23% of OT utilization and was significantly longer than the comparable international studies. Extubation time accounted for 5.7% of OT utilization. The issues surrounding transfer delays and prolonged anesthesia time were discussed, with strategies to address them developed with close vital input from our anesthesia colleagues and ward staff. Conclusion: Gross delays relatively simple in nature were identified due to poor management and less than ideal interspecialty coordination. Most delays were avoidable and can be addressed by proper planning, optimization of patient transfer and resources, and, most importantly, improved communication between surgeons, anesthetists, and ward staff. This can ensure optimal use of theater time and benefit all specialties, including ancillary staff, and, most importantly, the patient. A reaudit is warranted to assess the impact of interventions on OTT utilization

Whole exome sequencing identified five novel variants in CNTN2, CARS2, ARSA, and CLCN4 leading to epilepsy in consanguineous families

Introduction: Epilepsy is a group of neurological disorders characterized by recurring seizures and fits. The Epilepsy genes can be classified into four distinct groups, based on involvement of these genes in different pathways leading to Epilepsy as a phenotype. Genetically the disease has been associated with various pathways, leading to pure epilepsy-related disorders caused by CNTN2 variations, or involving physical or systemic issues along with epilepsy caused by CARS2 and ARSA, or developed by genes that are putatively involved in epilepsy lead by CLCN4 variations.Methods: In this study, five families of Pakistani origin (EP-01, EP-02, EP-04, EP-09, and EP-11) were included for molecular diagnosis.Results: Clinical presentations of these patients included neurological symptoms such as delayed development, seizures, regression, myoclonic epilepsy, progressive spastic tetraparesis, vision and hearing impairment, speech problems, muscle fibrillation, tremors, and cognitive decline. Whole exome sequencing in index patients and Sanger sequencing in all available individuals in each family identified four novel homozygous variants in genes CARS2: c.655G&gt;A p.Ala219Thr (EP-01), ARSA: c.338T&gt;C: p.Leu113Pro (EP-02), c.938G&gt;T p.Arg313Leu (EP-11), CNTN2: c.1699G&gt;T p.Glu567Ter (EP-04), and one novel hemizygous variant in gene CLCN4: c.2167C&gt;T p.Arg723Trp (EP-09).Conclusion: To the best of our knowledge these variants were novel and had not been reported in familial epilepsy. These variants were absent in 200 ethnically matched healthy control chromosomes. Three dimensional protein analyses revealed drastic changes in the normal functions of the variant proteins. Furthermore, these variants were designated as “pathogenic” as per guidelines of American College of Medical Genetics 2015. Due to overlapping phenotypes, among the patients, clinical subtyping was not possible. However, whole exome sequencing successfully pinpointed the molecular diagnosis which could be helpful for better management of these patients. Therefore, we recommend that exome sequencing be performed as a first-line molecular diagnostic test in familial cases