Fluxon analogues and dark solitons in linearly coupled Bose-Einstein condensates

Two effectively one-dimensional parallel coupled Bose-Einstein condensates in the presence of external potentials are studied. The system is modelled by linearly coupled Gross-Pitaevskii equations. In particular, grey-soliton-like solutions representing analogues of superconducting Josephson fluxons as well as coupled dark solitons are discussed. Theoretical approximations based on variational formulations are derived. It is found that the presence of a magnetic trap can destabilize the fluxon analogues. However, stabilization is possible by controlling the effective linear coupling between the condensates.Comment: 14 pages, 7 figures, The paper is to appear in Journal of Physics

Re-Scaling of Energy in the Stringy Charged Black Hole Solutions using Approximate Symmetries

This paper is devoted to study the energy problem in general relativity using approximate Lie symmetry methods for differential equations. We evaluate second-order approximate symmetries of the geodesic equations for the stringy charged black hole solutions. It is concluded that energy must be re-scaled by some factor in the second-order approximation.Comment: 18 pages, accepted for publication in Canadian J. Physic

Salivary Leptin, pH and Flow Rate Among a Group of Patients with Rheumatoid Arthritis In Iraq

Background: Rheumatoid arthritis (RA) is a chronic multisystemic disease which can lead to significant deformities and functional disability.Objectives:is to estimate level of salivary Leptin, flow rate and pH of saliva among group of patients with rheumatoid arthritis according to treatment.Patients and methods: Study design ;a case control study included Fifty women patients with rheumatoid arthritis; twenty-five on Methotrexate treatment and twenty-five on combination treatment of Methotrexate and Etanercept selected as study groups with an age range (30-40) years old and twenty-five gender, age and Body Mass Index matched healthy looking persons were selected as control. Collection of unstimulated salivary samples was carried out under standard conditions then salivary flow rate, pH in addition salivary Leptin was estimatedResults after adjustment for age, gender and body mass index; mean salivary flow rate was highest among rheumatoid arthritis cases on combination treatment (Etanercept and Methotrexate) =0.4±0.202 ml/min and least significant difference test between groups was statistically significant (p< 0.05). The mean salivary pH was highest among rheumatoid arthritis cases on combination treatment (Etanercept and Methotrexate) =7.1±0.29; however the differences between groups failed to reach the level of statistical significance. The median of salivary Leptin was highest among rheumatoid arthritis cases on Methotrexate =0.65ng/ml without statistically significant difference between groups, furthermore the salivary levels of Leptin in this study reveals weak correlation with disease activity score 28 r=0.127/p=0.42 among rheumatoid arthritis patients.  Conclusions:the whole unstimulated salivary flow rate was higher among rheumatoid arthritis cases on combination treatment (Etanercept and Methotrexate) revealing improvements in salivary gland functions, the study also concluded that salivary Leptin level is of low importance to assess disease activity to rheumatoid arthritis patients . Keywords: rheumatoid arthritis, salivary flow rate, salivary Lepti

Insight into the impact of COVID-19 on Australian transportation sector : an economic and community-based perspective

The Coronavirus Disease 2019 (COVID-19) is a major virus outbreak of the 21st century. The Australian government and local authorities introduced some drastic strategies and policies to control the outspread of this virus. The policies related to lockdown, quarantine, social distancing, shut down of educational institute, work from home, and international and interstate travel bans significantly affect the lifestyle of citizens and, thus, influence their activity patterns. The transport system is, thus, severely affected due to the COVID-19 related restrictions. This paper analyses how the transport system is impacted because of the policies adopted by the Australian government for the containment of the COVID-19. Three main components of the transport sector are studied. These are air travel, public transport, and freight transport. Various official sources of data such as the official website of the Australian government, Google mobility trends, Apple Mobility trends, and Moovit were consulted along with recently published research articles on COVID-19 and its impacts. The secondary sources of data include databases, web articles, and interviews that were conducted with the stakeholders of transport sectors in Australia to analyse the relationship between COVID-19 prevention measures and the transport system. The results of this study showed reduced demand for transport with the adoption of COVID-19 prevention measures. Declines in revenues in the air, freight, and public transport sectors of the transport industry are also reported. The survey shows that transport sector in Australia is facing a serious financial downfall as the use of public transport has dropped by 80%, a 31.5% drop in revenues earned by International airlines in Australia has been predicted, and a 9.5% reduction in the freight transport by water is expected. The recovery of the transport sector to the pre-pandemic state is only possible with the relaxation of COVID-19 containment policies and financial support by the government

A First Look at CQVID-19 Messages on WhatsApp in Pakistan

The worldwide spread of COVID-19 has prompted extensive online discussions, creating an `infodemic' on social media platforms such as WhatsApp and Twitter. However, the information shared on these platforms is prone to be unreliable and/or misleading. In this paper, we present the first analysis of COVID-19 discourse on public WhatsApp groups from Pakistan. Building on a large scale annotation of thousands of messages containing text and images, we identify the main categories of discussion. We focus on COVID-19 messages and understand the different types of images/text messages being propagated. By exploring user behavior related to COVID messages, we inspect how misinformation is spread. Finally, by quantifying the flow of information across WhatsApp and Twitter, we show how information spreads across platforms and how WhatsApp acts as a source for much of the information shared on Twitter

A gabor filter-based protocol for automated image-based building detection

Detecting buildings from high-resolution satellite imagery is beneficial in mapping, environmental preparation, disaster management, military planning, urban planning and research purposes. Differentiating buildings from the images is possible however, it may be a time-consuming or complicated process. Therefore, the high-resolution imagery from satellites needs to be automated to detect the buildings. Additionally, buildings exhibit several different characteristics, and their appearance in these images is unplanned. Moreover, buildings in the metropolitan environment are typically crowded and complicated. Therefore, it is challenging to identify the building and hard tolocate them. To resolve this situation, a novel probabilistic method has been suggested using local features and probabilistic approaches. A local feature extraction technique was implemented, which was used to calculate the probability density function. The locations in the image were represented as joint probability distributions and were used to estimate their probability distribution function (pdf). The density of building locations in the image was extracted. Kernel density distribution was also used to find the density flow for different metropolitan cities such as Sydney (Australia), Tokyo (Japan), and Mumbai (India), which is useful for distribution intensity and pattern of facility point f interest (POI). The purpose system can detect buildings/rooftops and to test our system, we choose some crops with panchromatic high-resolution satellite images from Australia and our results looks promising with high efficiency and minimal computational time for feature extraction. We were able to detect buildings with shadows and building without shadows in 0.4468 (seconds) and 0.5126 (seconds) respectively

Современное состояние проблемы хирургического лечения неопухолевых заболеваний толстой кишки и факторы, влияющие на его результаты. Часть 1.

Современное состояние проблемы хирургического лечения неопухолевых заболеваний толстой кишки и факторы, влияющие на его результаты. Часть 1

Диференційований підхід до вибору способу дислокації тонкокишкового трансплантата в порожнину малого таза

Мета. Покращити результати реконструктивно-відновних операцій після колектомії з наднизькою передньою резекцією прямої кишки шляхом оптимізації методів забезпечення вільної дислокації тонкокишкового трансплантата в порожнину малого таза. Матеріали і методи. Розроблені нові способи дислокації тонкокишкового трансплантата під час виконання реконструктивно-відновних операцій після колектомії з наднизькою передньою резекцією прямої кишки, мукозектомії хірургічного анального каналу, які передбачають мобілізацію кореня брижі тонкої кишки, пересічення судинної аркади верхньої брижової артерії (ВБА) та прямих її судин. Зазначені способи використано у 32 пацієнтів у комплексі з відомими методами в складних анатомічних умовах залежно від анатомічних особливостей брижі тонкої кишки, розташування відрізка клубової кишки, архітектоніки ВБА. Результати. Ускладнень в ранньому післяопераційному періоді, обумовлених дислокацією тонкокишкового трансплантата в порожнину малого таза, у оперованих пацієнтів не спостерігали. В пізньому післяопераційному періоді у 1 (3,1%) пацієнта виник ішемічний резервуарит, який не був пов’язаний з особливостями техніки дислокації. Висновки. Розроблені нові способи дислокації тонкокишкового трансплантата після резекції термінальної ділянки клубової кишки сприяють збільшенню його довжини та покращенню мобільності. Диференційований підхід до використання розроблених нових способів дислокації тонкокишкового трансплантата в комплексі з відомими методами забезпечував переміщення трансплантата в порожнину малого таза в складних анатомічних умовах, обумовлених зменшенням довжини термінальної ділянки клубової кишки, без натягу брижі тонкої кишки, суттєвого ризику виникнення його ішемії та некрозу

Морфофункціональне обгрунтування тазової тонкокишкової резервуарної конструкції нового типу

Морфофункціональне обгрунтування тазової тонкокишкової резервуарної конструкції нового тип

Black Holes in Bulk Viscous Cosmology

We investigate the effects of the accretion of phantom energy with non-zero bulk viscosity onto a Schwarzschild black hole and show that black holes accreting viscous phantom energy will lose mass rapidly compared to the non-viscous case. When matter is incorporated along with the phantom energy, the black holes meet with the same fate as bulk viscous forces dominate matter accretion. If the phantom energy has large bulk viscosity, then the mass of the black hole will reduce faster than in the small viscosity case.Comment: 20 pages, 3 figures, accepted for publication in Int. J. Theor. Phy