Discrete Dynamical Systems: A Brief Survey

Dynamical system is a mathematical formalization for any fixed rule that is described in time dependent fashion. The time can be measured by either of the number systems - integers, real numbers, complex numbers. A discrete dynamical system is a dynamical system whose state evolves over a state space in discrete time steps according to a fixed rule. This brief survey paper is concerned with the part of the work done by José Sousa Ramos [2] and some of his research students. We present the general theory of discrete dynamical systems and present results from applications to geometry, graph theory and synchronization

Impacts of \u3ci\u3eYartsa Gunbu\u3c/i\u3e Harvesting on Alpine Ecosystems in the Barun Valley, Makalu-Barun National Park, Nepal

Around 2003, the highly valuable medicinal fungi Ophiocordyceps sinensis (Nepali: yartsa gunbu) began to be commercially harvested in the remote Barun valley of the Makalu-Barun National Park and Buffer Zone, eastern Nepal. Since then, an estimated 3,000 collectors per year have visited the valley each harvesting season, placing new pressures upon its subalpine and alpine landscapes. A review of the yartsa gunbu literature suggested that its harvesting throughout highland India, Nepal, Bhutan, and China has brought important economic benefits, but that it has often been accompanied by a corresponding increase in negative environmental impacts such as alpine shrub destruction, wildlife poaching, and improper garbage disposal. Adverse social impacts reported have included an increase in violence, occasional murder, and the erosion of traditional values. In an attempt to determine if similar phenomena were occurring within the Barun valley, east Nepal, we conducted a month-long study of yartsa gunbu harvesting practices between May and June of 2016. Unlike other regions of the Himalaya, we found that violence and social unrest due to harvesting competition were unheard of in the Barun, which we link to the (a) lower market value of yartsa gunbu harvested there when compared to other regions, and (b) the recognized role of yartsa gunbu as a supplemental and livelihood diversifying income generation opportunity instead of a sole source of new income. Since its collection and sale were legalized by the Government of Nepal in 2001, the concurrent development of locally responsive yartsa gunbu harvesting policies and practices can also be linked to the general absence of environmental disturbance that we found

Knowledge, attitude and belief about contraception in post-partum and post abortal women in a tertiary care centre

Background: In this modern era where women have achieved the highest positions in politics, corporate world and conquered the moon, on the other side she is still fighting for her right, i.e. health. For this the women should become economically independent. The concept of waiting for a son preference by the society should be discouraged. Postpartum and post abortal period are very crucial for a women especially for many of those belonging to the villages as this may be the only time she comes in contact with a health personnel. Hence counseling should be given to all patients at this time.Methods: We conducted a cross-sectional study in the department of obstetrics and gynecology of sir Sunder Lal hospital between August 2013 to October 2013. 230 post-partum and post abortal women were interrogated and counseled about various methods of contraception. Awareness about emergency contraception pill and MTPill was also noted.Results: Only 69% had heard about various methods of contraception. IUCD and OCP were known to most patients. Most patients knew about contraception from television and doctors. After counseling 97% patients wanted contraception. Most patients opted for IUCD, Barrier method and DepoProvera. 20% patients knew about emergency contraception pill and 34.4% patients about MTPill.Conclusions: There is lack of awareness of contraception, emergency contraception and medical abortion in women under study. Regular counseling is a must to all post-partum and post abortal women. Information should be provided about various methods and patients should be given a choice to choose the method of contraception

Weak Equivalence Principle Test on a Sounding Rocket

SR-POEM, our principle of equivalence measurement on a sounding rocket, will compare the free fall rate of two substances yielding an uncertainty of E-16 in the estimate of \eta. During the past two years, the design concept has matured and we have been working on the required technology, including a laser gauge that is self aligning and able to reach 0.1 pm per root hertz for periods up to 40 s. We describe the status and plans for this project.Comment: Presented at the Fifth Meeting on CPT and Lorentz Symmetry, Bloomington, Indiana, June 28-July 2, 201

China Financial Research: A Review and Synthesis

We review the financial research on China as a transitional economy over the past fifteen years or so. This review sheds light on several important issues that are pertinent for an emerging financial market - how regulation can affect the prices of different financial assets; how and why markets are segmented; corporate governance effects between major and minor shareholders in an emerging market; the importance of a bank-based financial system; interactions between the financial market and the goods market; how market participants can complete the market; and how an emerging financial market emulates established markets and evolves over time. Many unexplored financial issues remain unexplored, and more research is warranted into, what theories are at work, and what are missing

Temperature-dependent proximity magnetism in Pt

We experimentally demonstrate the existence of magnetic coupling between two ferromagnets separated by a thin Pt layer. The coupling remains ferromagnetic regardless of the Pt thickness, and exhibits a significant dependence on temperature. Therefore, it cannot be explained by the established mechanisms of magnetic coupling across nonmagnetic spacers. We show that the experimental results are consistent with the presence of magnetism induced in Pt in proximity to ferromagnets, in direct analogy to the well-known proximity effects in superconductivity.Comment: 4 pages, 3 figure

Inter-limb jump asymmetries and their association with sport-specific performance in young male and female swimmers

This study aimed to examine inter-limb jump asymmetries and their association with sport-specific performance in young swimmers. Thirty-eight (male, n = 19; female, n = 19) regional/national level young swimmers (age: 12.3 ± 1.2 years; height: 159.6 ± 8.2 cm; body mass: 52.5 ± 9.2 kg) participated in this study. Inter-limb asymmetries were assessed for single-leg countermovement jump (SLCMJ) and single-leg standing long jump (SLSLJ). Sport-specific performance was evaluated using front crawl (i.e., 50 m and 25 m) and front crawl kick (i.e., 50 m and 25 m). The kappa coefficient revealed a “slight” level of agreement (Κ = 0.156, 0.184, and 0.197 for female, male, and all, respectively) between the direction of asymmetry for SLCMJ and SLSLJ, indicating that asymmetries rarely favored the same limb during both tests. A paired sample t-test showed a significant difference (p = 0.025) between asymmetry scores obtained in SLCMJ and SLSLJ. No significant difference was found in asymmetry scores between males and females (p = 0.099 to 0.977). Additionally, no association between asymmetry scores and sport-specific performance was observed (p > 0.05). Our findings highlight the independent nature of inter-limb asymmetries derived from SLCMJ and SLSLJ among young male and female swimmers. Further, our results suggest no association between jumping asymmetries and sport-specific performance

Impacts of Yartsa Gunbu Harvesting on Alpine Ecosystems in the Barun Valley, Makalu-Barun National Park, Nepal

Around 2003, the highly valuable medicinal fungi Ophiocordyceps sinensis (Nepali: yartsa gunbu) began to be commercially harvested in the remote Barun valley of the Makalu-Barun National Park and Buffer Zone, eastern Nepal. Since then, an estimated 3,000 collectors per year have visited the valley each harvesting season, placing new pressures upon its subalpine and alpine landscapes. A review of the yartsa gunbu literature suggested that its harvesting throughout highland India, Nepal, Bhutan, and China has brought important economic benefits, but that it has often been accompanied by a corresponding increase in negative environmental impacts such as alpine shrub destruction, wildlife poaching, and improper garbage disposal. Adverse social impacts reported have included an increase in violence, occasional murder, and the erosion of traditional values. In an attempt to determine if similar phenomena were occurring within the Barun valley, east Nepal, we conducted a month-long study of yartsa gunbu harvesting practices between May and June of 2016. Unlike other regions of the Himalaya, we found that violence and social unrest due to harvesting competition were unheard of in the Barun, which we link to the (a) lower market value of yartsa gunbu harvested there when compared to other regions, and (b) the recognized role of yartsa gunbu as a supplemental and livelihood diversifying income generation opportunity instead of a sole source of new income. Since its collection and sale were legalized by the Government of Nepal in 2001, the concurrent development of locally responsive yartsa gunbu harvesting policies and practices can also be linked to the general absence of environmental disturbance that we found

Formulation and Characterization of Phytostanol Ester Solid Lipid Nanoparticles for the Management of Hypercholesterolemia: An ex vivo Study.

Background: Phytostanols are naturally occurring compounds that reduce blood cholesterol levels significantly. However, their aqueous insolubility poses formulation challenges. Aim: To formulate and characterize solid lipid nanoparticle carriers for phytostanol esters to enhance the bioavailability of phytostanols. Methods: Phytostanol ester solid lipid nanoparticles were formulated by the microemulsion method. They were characterized for particle size distribution, polydispersity index, shape, surface charge, entrapment efficiency, stability, chemical structure, and thermal properties. The uptake of the formulation by cell lines, HepG2 and HT-29, and its effect on cell viability were evaluated. Results: The formulation of solid lipid nanoparticles was successfully optimised by varying the type of lipids and their concentration relative to that of surfactants in the present study. The optimised formulation had an average diameter of (171 ± 9) nm, a negative surface charge of (− 23.0 ± 0.8) mV and was generally spherical in shape. We report high levels of drug entrapment at (89 ± 5)% in amorphous form, drug loading of (9.1 ± 0.5)%, nanoparticle yield of (67 ± 4)% and drug excipient compatibility. The biological safety and uptake of the formulations were demonstrated on hepatic and intestinal cell lines. Conclusion: Phytostanol ester solid lipid nanoparticles were successfully formulated and characterized. The formulation has the potential to provide an innovative drug delivery system for phytostanols which reduce cholesterol and have a potentially ideal safety profile. This can contribute to better management of one of the main risk factors of cardiovascular disease