Magnetic properties of Fe5_5SiB2_2 and its alloys with P, S, and Co

Fe$_5$SiB$_2$ has been synthesized and magnetic measurements have been carried out, revealing that M$_{\text{sat}}$ = 0.92 MA/m at T = 300 K. The M vs T curve shows a broad peak around T = 160 K. The anisotropy constant, K$_1$, estimated at T = 300 K, is 0.25 MJ/m$^3$. Theoretical analysis of Fe$_5$SiB$_2$ system has been carried out and extended to the full range of Fe$_5$Si$_{1-x}$P$_x$B$_2$, Fe$_5$P$_{1-x}$S$_x$B$_2$, and (Fe$_{1-x}$Co$_x$)$_5$SiB$_2$ compositions. The electronic band structures have been calculated using the Full-Potential Local-Orbital Minimum-Basis Scheme (FPLO-14). The calculated total magnetic moments are 9.20, 9.15, 9.59 and 2.42$\mu_B$ per formula units of Fe$_5$SiB$_2$, Fe$_5$PB$_2$, Fe$_5$SB$_2$, and Co$_5$SiB$_2$, respectively. In agreement with experiment, magnetocrystalline anisotropy energies (MAE's) calculated for T = 0 K changes from a negative (easy-plane) anisotropy -0.28 MJ/m$^3$ for Fe$_5$SiB$_2$ to the positive (easy-axis) anisotropy 0.35 MJ/m$^3$ for Fe$_5$PB$_2$. Further increase of the number of p-electrons in Fe$_5$P$_{1-x}$S$_x$B$_2$ leads to an increase of MAE up to 0.77 MJ/m$^3$ for the hypothetical Fe$_5$P$_{0.4}$S$_{0.6}$B$_2$ composition. Volume variation and fixed spin moment calculations (FSM) performed for Fe$_5$SiB$_2$ show an inverse relation between MAE and magnetic moment in the region down to about 15\% reduction of the spin moment. The alloying of Fe$_5$SiB$_2$ with Co is proposed as a practical realization of magnetic moment reduction, which ought to increase MAE. MAE calculated in virtual crystal approximation (VCA) for a full range of (Fe$_{1-x}$Co$_x$)$_5$SiB$_2$ compositions reaches the maximum value of 1.16 MJ/m$^3$ at Co concentration x = 0.3, with the magnetic moment 7.75$\mu_B$ per formula unit. Thus, (Fe$_{0.7}$Co$_{0.3}$)$_5$SiB$_2$ is suggested as a candidate for a rare-earth free permanent magnet.Comment: 11 pages, 14 figure

Business Models for Sustainable Finance: The Case Study of Social Impact Bonds

Business models for sustainability (BMfS) are relevant topics on research agendas, given their orientation toward sustainability issues. However, traditional versions of these models are often ill-equipped at solving complex social problems. Cross-sector partnerships for sustainability (CSPfS) have been recognized as a new paradigm that mitigates the failure of traditional models. Impact investing, and social impact bonds (SIBs) in particular, represent an interesting field of research in innovative business models for sustainable finance, even though the literature does not consider SIBs within this broader field. We propose an exploratory study based on qualitative methods aimed at conceptualizing SIBs within the framework of BMfS and understanding how SIB collaboration varies across social sectors and geographical areas. Our study identifies three different models of SIBs characterized by the different degrees of collaboration between actors: (i) SIB as a fully collaborative partnership; (ii) SIB as a low-collaborative partnership; and (iii) SIB as a partially collaborative partnership. Our findings are useful to policy makers and practitioners involved in the SIB design, suggesting that a fully collaborative SIB model may stand a better chance of achieving the expected social impacts

Implementing the Simple Biosphere Model (SiB) in a general circulation model: Methodologies and results

The Simple Biosphere MOdel (SiB) of Sellers et al., (1986) was designed to simulate the interactions between the Earth's land surface and the atmosphere by treating the vegetation explicitly and relistically, thereby incorporating biophysical controls on the exchanges of radiation, momentum, sensible and latent heat between the two systems. The steps taken to implement SiB in a modified version of the National Meteorological Center's spectral GCM are described. The coupled model (SiB-GCM) was used with a conventional hydrological model (Ctl-GCM) to produce summer and winter simulations. The same GCM was used with a conventional hydrological model (Ctl-GCM) to produce comparable 'control' summer and winter variations. It was found that SiB-GCM produced a more realistic partitioning of energy at the land surface than Ctl-GCM. Generally, SiB-GCM produced more sensible heat flux and less latent heat flux over vegetated land than did Ctl-GCM and this resulted in the development of a much deeper daytime planetary boundary and reduced precipitation rates over the continents in SiB-GCM. In the summer simulation, the 200 mb jet stream and the wind speed at 850 mb were slightly weakened in the SiB-GCM relative to the Ctl-GCM results and equivalent analyses from observations

Towards Social Security Systems in Japan Lessons for India

Japan has to restructure its social security systems fromtime to time for different reasons like a far more rapid aging of population , the slow down of long term economic growth and deteriorating equity in the inter-generational transfer of welfare .But even then, the basic elements remain the same .It si pertinent to see how and to whar extent japan’s social security systems could be translated in the case of India. As apreliminary analysis ,in section One, attempt has been made to summarize the distinctive features of social security systems in Japan.Section Two dwells upon the nature and problems of the social security systems in India. An endeavour has been made in Section three to articulate on the lessons for India. Final Section Four concludes and summarizes the main findings.It has ben observed that there are certain experiences that India can learn ,amongothers, the careful application of universal social security systems, the role of insurance policies,private-public synergies ,the role of the government and governance, the importance attached to social capital.Universal social security system, private–public partnership, Inter-generational Equity governance, social capital

Analisis Pengaruh Stimulasi Koh terhadap Peningkatan Laju Alir Produksi Sumur Sib 1, Sib 2 dan Sib 3

Penurunan laju produksi merupakan salah satu dampak yang dapat terjadi akibat adanya kerusakan formasi disekitar lubang sumur. Kerusakan formasi pada sumur yang menjadi objek penelitian pada sumur SIB 1, SIB 2 dan SIB 3 disebabkan oleh clay yang mengembang. Stimulasi KOH dilakukan untuk meningkatkan kembali produksi sumur SIB 1, SIB 2 dan SIB 3. KOH dipilih karena KOH dapat menstabilkan clay sehingga pori-pori yang terhalang oleh clay swelling dapat mengalirkan kembali fluida sehingga meningkatkan kembali laju alir produksi. Penelitian ini bertujuan untuk menganalisis keberhasilan dan peningkatan laju alir produksi setelah pelaksanaan stimulasi KOH. Analisis keberhasilan stimulasi KOH dapat diketahui dengan membandingkan laju alir produksi minyak (Qo), productivity index (PI), dan kurva inflow performance relationship (IPR) sebelum dan sesudah stimulasi KOH. Pelaksanaan stimulasi KOH berhasil pada sumur SIB 1, SIB 2 dan SIB 3. Hal ini ditandai dengan adanya peningkatan laju alir produksi minyak dan productivity index (PI). Peningkatan laju alir produksi minyak pada sumur SIB 1 adalah 227.8 %, SIB 2 adalah 111.86 % dan SIB 3 102.9 %. Sedangkan peningkatan nilai productivity index (PI) pada sumur SIB 1 adalah 96.3%, SIB 2 40.86% dan SIB 3 24.05%. Q max sumur SIB 1 meningkat 99.1 %, SIB 2 40.68% dan SIB 3 meningkat sebesar 24.18%

The Rise of the Resilient Local Authority?

The term resilience is increasingly being utilised within the study of public policy to depict how individuals, communities and organisations can adapt, cope, and ‘bounce back’ when faced with external shocks such as climate change, economic recession and cuts in public expenditure. In focussing on the local dimensions of the resilience debate, this article argues that the term can provide useful insights into how the challenges facing local authorities in the UK can be reformulated and reinterpreted. The article also distinguishes between resilience as ‘recovery’ and resilience as ‘transformation’, with the latter's focus on ‘bouncing forward’ from external shocks seen as offering a more radical framework within which the opportunities for local innovation and creativity can be assessed and explained. While also acknowledging some of the weaknesses of the resilience debate, the dangers of conceptual ‘stretching’, and the extent of local vulnerabilities, the article highlights a range of examples where local authorities – and crucially, local communities – have enhanced their adaptive capacity, within existing powers and responsibilities. From this viewpoint, some of the barriers to the development of resilient local government are not insurmountable, and can be overcome by ‘digging deep’ to draw upon existing resources and capabilities, promoting a strategic approach to risk, exhibiting greater ambition and imagination, and creating space for local communities to develop their own resilience

A review of recent research on improvement of physical parameterizations in the GLA GCM

A systematic assessment of the effect of a series of improvements in physical parameterizations of the Goddard Laboratory for Atmospheres (GLA) general circulation model (GCM) are summarized. The implementation of the Simple Biosphere Model (SiB) in the GCM is followed by a comparison of SiB GCM simulations with that of the earlier slab soil hydrology GCM (SSH-GCM) simulations. In the Sahelian context, the biogeophysical component of desertification was analyzed for SiB-GCM simulations. Cumulus parameterization is found to be the primary determinant of the organization of the simulated tropical rainfall of the GLA GCM using Arakawa-Schubert cumulus parameterization. A comparison of model simulations with station data revealed excessive shortwave radiation accompanied by excessive drying and heating to the land. The perpetual July simulations with and without interactive soil moisture shows that 30 to 40 day oscillations may be a natural mode of the simulated earth atmosphere system