Stress-Strain Relation in Debris Flow Analysis

In debris flow analysis, the generalized viscop1astic fluid (GVF) model can be used as the constitutive equations. When the yield stress is negligible, the shear expression in the GVF model for simple shear flow reduces to r = µ1 (du/dz)n, where r is the shear stress, µ1 is the consistency index, du/dz is the shear rate, and n is the flow behavior index. In this paper the r versus du/dz relation is studied by running experiments with 14 mm dry glass spheres in a conveyor-belt flume. A comparison of the estimated r with the measured du/dz across the flow depth indicates that µ1 is a strong function of the concentration that changes across the flow depth and thus, must be included in the analysis of the r versus du/dz relation. An analysis of experimental results indicates that a relation between r/µ1 and du/dz is more meaningful; therefore, concentration data across the flow depth is needed. In this paper a viable method based on a Van Der Waals type equation of state is developed from experimental results, thereby assessing the applicability of r/µ1 versus du/dz relation in debris flow analysis

Stress-Strain Relation in Debris Flow Analysis

In debris flow analysis, the generalized viscop1astic fluid (GVF) model can be used as the constitutive equations. When the yield stress is negligible, the shear expression in the GVF model for simple shear flow reduces to r = µ1 (du/dz)n, where r is the shear stress, µ1 is the consistency index, du/dz is the shear rate, and n is the flow behavior index. In this paper the r versus du/dz relation is studied by running experiments with 14 mm dry glass spheres in a conveyor-belt flume. A comparison of the estimated r with the measured du/dz across the flow depth indicates that µ1 is a strong function of the concentration that changes across the flow depth and thus, must be included in the analysis of the r versus du/dz relation. An analysis of experimental results indicates that a relation between r/µ1 and du/dz is more meaningful; therefore, concentration data across the flow depth is needed. In this paper a viable method based on a Van Der Waals type equation of state is developed from experimental results, thereby assessing the applicability of r/µ1 versus du/dz relation in debris flow analysis

Security of Deputy Signature

E-system, a new commerce model, is a new era for business direction. When a principal is absent (goes on an errand or on leave), a well-designed deputy system keeps the business operations working. In the network world, identity verification and any substitute for traditional signature can be done by digital signature [1]. Deputy signature guarantees the existence of deputy system in e-system. Current deputy mechanism addresses the verification of deputy signature. No research has been done on the prevention of the illegal use of deputy system when the principal returns and the deputy system is not in use. We propose a mechanism to solve the problem of illegal use of deputy system when the power of deputy system is not legally “ON.

Frontal skull craniotomy combined with moderate-dose radiotherapy effectively ameliorate a rare case of non-secretory, multiple myeloma with orbital involvement

<p>Abstract</p> <p>Background</p> <p>Orbital infiltration in patients with multiple myeloma is a rare condition, with less than 50 cases reported in the medical literature. Most patients undergo conservative treatment because multiple myeloma is a disseminated systemic disease.</p> <p>Case presentation</p> <p>A 43-year-old male subject with multiple myeloma and long-term survival presented with orbital involvement. The subject lacked the typical features and poor prognostic factors associated with multiple myeloma, such as renal failure, hypercalcemia, and paraprotein in the serum and urine. The orbital computed tomographic scan revealed the tumor encasing the optic nerve, but without prominent bony destruction. Therefore, a frontal skull craniotomy with an epidural entrance to the orbital space was performed, to completely extirpate the orbital mass. The surgical procedure was followed by moderate-dose radiation therapy. After 32 months of follow-up care, the subject is doing well with excellent local control.</p> <p>Conclusion</p> <p>Although the effectiveness and applicability of this approach remains to be determined, this case report demonstrates that accurate and early detection combined with local surgical treatment and appropriate radio/chemotherapy, can be applied to effectively extend an orbital multiple myeloma patient's life.</p

Staphylococcal Cassette Chromosome mec in MRSA, Taiwan

To determine the predominant staphylococcal cassette chromosome (SCC) mec element in methicillin-resistant Staphylococcus aureus, we typed 190 isolates from a hospital in Taiwan. We found a shift from type IV to type III SCCmec element during 1992–2003, perhaps caused by selective pressure from indiscriminate use of antimicrobial drugs