Analisa Pelaksanaan Pekerjaan Inspeksi Dan Pengujian Pesawat Angkat Di Pertambangan

PT. ”X” Indonesia merupakan salah satu perusahaan tambang terbesar di dunia sehingga untuk perluasan area  tambangnya diperlukan suatu pekerjaan konstruksi berskala besar menggunakan pesawat angkat dan sampai saat ini telah tersedia 374 unit. Sebagai perusahaan kelas dunia, maka harus peduli pada keselamatan para pekerja, instalasi peralatan maupun lingkungan dan menjadikannya proritas utama selain produksi. Untuk menjamin kondisi dan keamanan pesawat angkat yang dioperasikan, dibutuhkan suatu metode inspeksi dan pengujian sertifikasi secara berkala yang dilakukan oleh pemerintah melalui Perusahaan Jasa Keselamatan dan Kesehatan Kerja (PJK3). Namun ternyata, waktu penyelesaiannya adalah 2 tahun 5 bulan sehingga tidak sesuai dengan masa berlaku Surat Kelayakan Penggunaan Peralatan (SKPP), yang hanya 2 tahun. Agar inspeksi dan pengujian pesawat angkat dalam rangka sertifikasi kurang dari 2 tahun, perusahaan dapat menerapkan Critical Path Method (CPM), dengan  jumlah pesawat angkat 374 unit, sehingga dapat menyelesaikan pekerjaan tersebut dalam waktu 1 tahun 7 bulan. Disarankan penelitian ini dilanjutkan sampai pada penerbitan SKPP oleh Direktorat Teknik, Lingkungan, Mineral dan Batu Bara sehingga dapat diketahui keseluruhan waktu dan biaya yang dibutuhkan. Kata kunci : Inspeksi dan Pengujian Pesawat Angkat, Critical Path Method, Waktu dan Biay

Optimization of Implementation of Crane Certification in Contruction Service Companies

Purpose: This study aims to analyze the effect of accelerating the implementation of work and the costs needed for the job of occupational safety and health certification in the Construction services company in East Java province. Design/methodology/approach: This study used a survey method carried out on 20 crane units in 4 construction service companies by analyzing data using Critical Path Method (CPM), resulting in an acceleration of inspection and testing of crane up to 37% with cost efficiency of  36 %. Findings: The results of this study are expected to provide an overview of Crane's reliability as early as possible to users to anticipate operational failures through regular maintenance and repairs. Research limitations/implications: This study can also determine the timing of inspection and testing in the context of implementing the Crane Occupational Safety and Health certification so that the use of resources can be optimized. Practical implications: With the implementation of inspection and testing, certification can be fulfilled before the certification period ends. Originality/value: This paper is original Paper type: Research pape

Weak KAM for commuting Hamiltonians

For two commuting Tonelli Hamiltonians, we recover the commutation of the Lax-Oleinik semi-groups, a result of Barles and Tourin ([BT01]), using a direct geometrical method (Stoke's theorem). We also obtain a "generalization" of a theorem of Maderna ([Mad02]). More precisely, we prove that if the phase space is the cotangent of a compact manifold then the weak KAM solutions (or viscosity solutions of the critical stationary Hamilton-Jacobi equation) for G and for H are the same. As a corrolary we obtain the equality of the Aubry sets, of the Peierls barrier and of flat parts of Mather's $\alpha$ functions. This is also related to works of Sorrentino ([Sor09]) and Bernard ([Ber07b]).Comment: 23 pages, accepted for publication in NonLinearity (january 29th 2010). Minor corrections, fifth part added on Mather's $\alpha$ function (or effective Hamiltonian

On the flow map for 2D Euler equations with unbounded vorticity

In Part I, we construct a class of examples of initial velocities for which the unique solution to the Euler equations in the plane has an associated flow map that lies in no Holder space of positive exponent for any positive time. In Part II, we explore inverse problems that arise in attempting to construct an example of an initial velocity producing an arbitrarily poor modulus of continuity of the flow map.Comment: http://iopscience.iop.org/0951-7715/24/9/013/ for published versio

Critical Decay at Higher-Order Glass-Transition Singularities

Within the mode-coupling theory for the evolution of structural relaxation in glass-forming systems, it is shown that the correlation functions for density fluctuations for states at A_3- and A_4-glass-transition singularities can be presented as an asymptotic series in increasing inverse powers of the logarithm of the time t: $\phi(t)-f\propto \sum_i g_i(x)$, where $g_n(x)=p_n(\ln x)/x^n$ with p_n denoting some polynomial and x=ln (t/t_0). The results are demonstrated for schematic models describing the system by solely one or two correlators and also for a colloid model with a square-well-interaction potential.Comment: 26 pages, 7 figures, Proceedings of "Structural Arrest Transitions in Colloidal Systems with Short-Range Attractions", Messina, Italy, December 2003 (submitted

A Nonperturbative Eliasson's Reducibility Theorem

This paper is concerned with discrete, one-dimensional Schr\"odinger operators with real analytic potentials and one Diophantine frequency. Using localization and duality we show that almost every point in the spectrum admits a quasi-periodic Bloch wave if the potential is smaller than a certain constant which does not depend on the precise Diophantine conditions. The associated first-order system, a quasi-periodic skew-product, is shown to be reducible for almost all values of the energy. This is a partial nonperturbative generalization of a reducibility theorem by Eliasson. We also extend nonperturbatively the genericity of Cantor spectrum for these Schr\"odinger operators. Finally we prove that in our setting, Cantor spectrum implies the existence of a $G_\delta$-set of energies whose Schr\"odinger cocycle is not reducible to constant coefficients

High-mobility group box-1 protein, lipopolysaccharide-binding protein, interleukin-6 and C-reactive protein in children with community acquired infections and bacteraemia: a prospective study

<p>Abstract</p> <p>Introduction</p> <p>Even though sepsis is one of the common causes of children morbidity and mortality, specific inflammatory markers for identifying sepsis are less studied in children. The main aim of this study was to compare the levels of high-mobility group box-1 protein (HMGB1), Lipopolysaccharide-binding protein (LBP), Interleukin-6 (IL-6) and C-reactive protein (CRP) between infected children without systemic inflammatory response syndrome (SIRS) and children with severe and less severe sepsis. The second aim was to examine HMGB1, LBP, IL6 and CRP as markers for of bacteraemia.</p> <p>Methods</p> <p>Totally, 140 children with suspected or proven infections admitted to the Children's Clinical University Hospital of Latvia during 2008 and 2009 were included. Clinical and demographical information as well as infection focus were assessed in all patients. HMGB1, LBP, IL-6 and CRP blood samples were determined. Children with suspected or diagnosed infections were categorized into three groups of severity of infection: (i) infected without SIRS (n = 36), (ii) sepsis (n = 91) and, (iii) severe sepsis (n = 13). They were furthermore classified according bacteraemia into (i) bacteremia (n = 30) and (ii) no bacteraemia (n = 74).</p> <p>Results</p> <p>There was no statistically significant difference in HMGB1 levels between children with different levels of sepsis or with and without bacteraemia. The levels of LBP, IL-6 and CRP were statistically significantly higher among patients with sepsis compared to those infected but without SIRS (<it>p </it>< 0.001). Furthermore, LBP, IL-6 and CRP were significantly higher in children with severe sepsis compared to those ones with less severe sepsis (<it>p </it>< 0.001). Median values of LBP, IL6 and CRP were significantly higher in children with bacteraemia compared to those without bacteraemia. The area under the receiver operating curve (ROC) for detecting bacteraemia was 0.87 for both IL6 and CRP and 0.82 for LBP, respectively.</p> <p>Conclusion</p> <p>Elevated levels of LBP, IL-6 and CRP were associated with a more severe level of infection in children. Whereas LBP, IL-6 and CRP seem to be good markers to detect patients with bacteraemia, HMGB1 seem to be of minor importance. LBP, IL-6 and CRP levels may serve as good biomarkers for identifying children with severe sepsis and bacteraemia and, thus, may be routinely used in clinical practice.</p

Effect of metformin on bone marrow progenitor cell differentiation: in vivo and in vitro studies

Diabetes mellitus is associated with bone loss. Patients with type 2 diabetes are frequently treated with oral antidiabetic drugs such as sulfonylureas, biguanides, and thiazolidinediones. Rosiglitazone treatment has been shown to increase adipogenesis in bone marrow and to induce bone loss. In this study we evaluated the effect of in vivo and in vitro treatment with metformin on bone marrow progenitor cells (BMPCs), as well as the involvement of AMPK pathway in its effects. The in vitro effect of coincubation with metformin and rosiglitazone on the adipogenic differentiation of BMPCs also was studied. In addition, we evaluated the effect of in vivo metformin treatment on bone regeneration in a model of parietal lesions in nondiabetic and streptozotocin-induced diabetic rats. We found that metformin administration both in vivo and in vitro caused an increase in alkaline phosphatase activity, type I collagen synthesis, osteocalcin expression, and extracellular calcium deposition of BMPCs. Moreover, metformin significantly activated AMPK in undifferentiated BMPCs. In vivo, metformin administration enhanced the expression of osteoblast-specific transcription factor Runx2/Cbfa1 and activation of AMPK in a time-dependent manner. Metformin treatment also stimulated bone lesion regeneration in control and diabetic rats. In vitro, metformin partially inhibited the adipogenic actions of rosiglitazone on BMPCs. In conclusion, our results indicate that metformin causes an osteogenic effect both in vivo and in vitro, possibly mediated by Runx2/Cbfa1 and AMPK activation, suggesting a possible action of metformin in a shift toward the osteoblastic differentiation of BMPCs

Demostración del efecto de la tensión superficial en un preparado para medir distensibilidad del pulmón aislado de rata

Entre las actividades prácticas de muestra Cátedra se encuentra la medición de la distensibilidad de un pulmón aislado de rata. Nuestro objetivo fue demostrar la contribución de la TS a la DP total, y el rol del agente surfactante, desarrollando un sistema de medición de la TS sencillo, preciso, y portátil.Facultad de Ciencias Médica

Demostración del efecto de la tensión superficial en un preparado para medir distensibilidad del pulmón aislado de rata

Entre las actividades prácticas de muestra Cátedra se encuentra la medición de la distensibilidad de un pulmón aislado de rata. Nuestro objetivo fue demostrar la contribución de la TS a la DP total, y el rol del agente surfactante, desarrollando un sistema de medición de la TS sencillo, preciso, y portátil.Facultad de Ciencias Médica