Counting spanning trees on fractal graphs and their asymptotic complexity

Using the method of spectral decimation and a modified version of Kirchhoff's Matrix-Tree Theorem, a closed form solution to the number of spanning trees on approximating graphs to a fully symmetric self-similar structure on a finitely ramified fractal is given in Theorem \ref{thm:maintheoremfull}. We show how spectral decimation implies the existence of the asymptotic complexity constant and obtain some bounds for it. Examples calculated include the Sierpinski Gasket, a non post critically finite analog of the Sierpinski Gasket, the Diamond fractal, and the Hexagasket. For each example, the asymptotic complexity constant is found.Comment: 26 pages. arXiv admin note: substantial text overlap with arXiv:1211.734

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Rectorale oratie Vrije Universiteit 191

Should active recruitment of health workers from sub-Saharan Africa be viewed as a crime?

[No abstract available]Articl

Implementation of the participatory approach for supervisors to prevent sick leave: a process evaluation

To perform a process evaluation of a multifaceted strategy to implement the participatory approach for supervisors to prevent sick leave in three organisations. The implementation strategy incorporated a working group meeting with stakeholder representatives, supervisor training, and optional supervisor coaching. Context, recruitment, reach, dose delivered, dose received, fidelity, and satisfaction with the strategy were assessed at organisational and supervisor level using questionnaires and registration forms. At least 4 out of 6 stakeholders were represented in the working group meetings, and 11 % (n = 116) of supervisors could be reached. The working group meetings and supervisor training were delivered and received as planned and were well appreciated within all three organisations. Three supervisors made use of coaching. At 6-month follow-up, 11 out of 41 supervisors (27 %) indicated that they had applied the participatory approach at least one time. The implementation strategy was largely carried out as intended. However, reach of both supervisors and department managers should be improved. Future studies should consider targeting employees with the strategy

Factors associated with first return to work and sick leave durations in workers with common mental disorders

Background: Associations are examined between socio-demographic, medical, work-related and organizational factors and the moment of first return to work (RTW) (within or after 6 weeks of sick leave) and total sick leave duration in sick leave spells due to common mental disorders. Methods: Data are derived from a Dutch database, build to provide reference data for sick leave duration for various medical conditions. The cases in this study were entered in 2004 and 2005 by specially trained occupational health physicians, based on the physician's assessment of medical and other factors. Odds ratios for first RTW and sick leave durations are calculated in logistic regression models. Results: Burnout, depression and anxiety disorder are associated with longer sick leave duration. Similar, but weaker associations were found for female sex, being a teacher, small company size and moderate or high psychosocial hazard. Distress is associated with shorter sick leave duration. Medical factors, psychosocial hazard and company size are also and analogously associated with first RTW. Part-time work is associated with delayed first RTW. The strength of the associations varies for various factors and for different sick leave durations. Conclusion: The medical diagnosis has a strong relation with the moment of first RTW and the duration of sick leave spells in mental disorders, but the influence of demographic and work-related factors should not be neglected

Coordinated and tailored work rehabilitation: a randomized controlled trial with economic evaluation undertaken with workers on sick leave due to musculoskeletal disorders

Introduction In Denmark, the magnitude and impact of work disability on the individual worker and society has prompted the development of a new "coordinated and tailored work rehabilitation" (CTWR) approach. The aim of this study was to compare the effects of CTWR with conventional case management (CCM) on return-to-work of workers on sick leave due to musculoskeletal disorders (MSDs). Methods The study was a randomized controlled trial with economic evaluation undertaken with workers on sick leave for 4-12 weeks due to MSDs. CTWR consists of a work disability screening by an interdisciplinary team followed by the collaborative development of a RTW plan. The primary outcome variable was registered cumulative sickness absence hours during 12 months follow-up. Secondary outcomes were work status as well as pain intensity and functional disability, measured at baseline, 3 and 12 months follow-up. The economic evaluation (intervention costs, productivity loss, and health care utilization costs) was based on administrative data derived from national registries. Results For the time intervals 0-6 months, 6-12 months, and the entire follow-up period, the number of sickness absence hours was significantly lower in the CTWR group as compared to the control group. The total costs saved in CTWR participants compared to controls were estimated at US $1,366 per person at 6 months follow-up and US$ 10,666 per person at 12 months follow-up. Conclusions Workers on sick leave for 4-12 weeks due to MSD who underwent "CTWR" by an interdisciplinary team had fewer sickness absence hours than controls. The economic evaluation showed that-in terms of productivity loss-CTWR seems to be cost saving for the society

UJI AKTIVITAS PROTEASE DAN KARAKTERISASI PH ACTINOMYCETES ISOLAT ATH-03 ASAL TAHURA POCUT MEURAH INTAN KABUPATEN ACEH BESAR

ABSTRAKKata kunci: Aktivitas Protease, Karakterisasi pH, Actinomycetes.Penelitian Uji Aktivitas Protease dan Karakterisasi pH Actinomycetes Isolat ATH-03 Asal Tahura Pocut Meurah Intan Kabupaten Aceh Besar telah dilaksanakan sejak tanggal 3 September sampai dengan 27 Desember 2012. Penelitian ini bertujuan untuk mengukur aktivitas protease dan mengetahui pH optimum aktivitas protease dari isolat Actinomycetes ATH-03. Metode penelitian yang digunakan adalah metode Eksperimen dengan Rancangan Acak Lengkap Non Faktorial dengan 6 kali perlakuan, 2 kali ulangan. Data yang diperoleh dianalisis secara deskriptif yang terkait dengan nilai indeks proteolitik sebagai dasar seleksi isolat Actinomycetes. Isolat Actinomycetes berasal dari koleksi Laboratorium Mikrobiologi Jurusan Biologi FMIPA Universitas Syiah Kuala. Delapan belas isolat Actinomycetes menunjukkan aktivitas pada Media NA yang mengandung susu skim 1%. Isolat ATH-03 dipilih dalam penelitian ini karena memiliki zona bening yang lebar dengan indeks proteolitik (IP) tertinggi 8,537 setelah inkubasi selama 48 jam pada Media NAS. Protease ekstraseluler dikarakterisasi menggunakan media NB yang mengandung susu skim 1% sebagai media produksi. Waktu optimum pemanenan ekstrak kasar protease isolat ATH-03 pada hari ke-7 dengan aktivitas sebesar 0,083 U/ml, kadar protein 0,003 mg/ml dan aktivitas spesifik mencapai 23,72 U/mg. Hasil karakterisasi pH ekstrak kasar enzim isolat ATH-03 menunjukkan aktivitas optimum pada pH 8 yaitu 0,067 U/ml, protease yang dihasilkan oleh isolat ini aktif pada kisaran pH netral.Banda Ace