735 research outputs found
PPT Webinar Ko+Lab 14042023
No full textWebinar Labs Series "LR to SLR"
Penelitian yg baik dimulai dengan studi literature yang tepat. Literature Review (LR) atau tradisional Review biasanya menjawab pertanyaan penelitian yang luas dan deskriptif. Systematic literature review (SLR) menjawab kebutuhan peneliti untuk mendapatkan hal yg lebih sistematis dan komprehensif serta tepat karena berusaha menjawab pertanyaan ilmiah spesifik yang sangat penting.
Research Alliance Ko+Lab bersama Startup IdSpora menyelenggarakan Webinar Labs Series dengan judul "LR to SLR" </p
Floer cohomology of Lagrangian intersections and pseudo-holomorphic disks. I.Addendum
No full textThis is an addendum to the author's earlier paper ''Floer Cohomology of Lagrangian Intersection and Pseudo-Holomorphic Discs, I,'' Comm. Pure Appl. Math. 46, 1993, pp. 949-993. The main result of this addendum extends the definition of the Fleer cohomology of Lagrangian intersection to the case where the minimal Maslov number is equal to 2. (C) 1996 John Wiley & Sons, Inc.X1145sciescopu
Spectral invariants and the length minimizing property of Hamiltonian paths
No full textIn this paper we provide a criterion for the quasi-autonomous Hamiltonian path ("Hofer's geodesic") on arbitrary closed symplectic manifolds (M, omega) to be length minimizing in its homotopy class in terms of the spectral invariants rho(G; 1) that the author has recently constructed. As an application, we prove that any autonomous Hamiltonian path on arbitrary closed symplectic manifolds is length minimizing in its homotopy class with fixed ends, as long as it has no contractible periodic orbits of period one and it has a maximum and a minimum that are generically under-twisted, and all of its critical points are non-degenerate in the Floer theoretic sense.X1110sci
Influence of rhenium on the microstructures and mechanical properties of a mechanically alloyed oxide dispersion-strengthened nickel-base superalloy
No full textThe influence of a 3wt% Re addition on the creep strength and microstructure of a mechanically alloyed and oxide dispersion-strengthened nickel-base superalloy was investigated. Two alloys, Ni-8Cr-6.5Al-6W-3Ta-1.5Mo-6Co-1Ti-3Re-0.15Zr -0.05C-0.01B-0.9Y(2)O(3) (3Re alloy) and a non-rhenium containing (ORe) alloy were prepared for this study. The 3Re alloy showed two-fold improvement in creep life compared with that of 0Re alloy, presumably due to a change in the mode of the precipitate-dislocation interaction. For the 3Re alloy, finer, more cuboidal and aligned gamma' precipitates a re formed, which force the mobile dislocations at the gamma-gamma' interfaces to cut precipitates in order to proceed. Shearing of precipitates is evinced by the existence of stacking faults and results in an increase of creep strength. In contrast, lower creep strength was observed for ORe alloy because a dislocation looping mode is dominant with coarser and more irregularly shaped gamma' precipitates present in this alloy. Another possible explanation for an improved creep strength of 3Re alloy is related to the tangled dislocation structure formed by the interaction between glide dislocation and interfacial dislocation, which also acts as an effective barrier for further glide dislocation motion. A 3wt% Re addition significantly retards gamma' coarsening kinetics. Rhenium acts as a rate-controlling species upon the volume diffusion-controlled coarsening process because it is a heavy element and also it almost solely partitions to the gamma matrix. X-ray diffraction experiments showed that the magnitude of the lattice mismatch between gamma and gamma' increased with the 3wt% Re addition from 0% to -0.26% at room temperature. Increased lattice mismatch for 3Re alloy causes the formation of more aligned and cuboidal gamma' precipitates rather than random and odd-shaped gamma' precipitates for ORe alloy, and it also accelerates the coalescence between cuboidal gamma' precipitates. (C) 1998 Kluwer Academic Publishers.The authors acknowledge Inco Alloy International, Inc., for supplying the specimens
Floer mini-max theory, the Cerf diagram, and the spectral invariants
No full textThe author previously defined the spectral invariants, denoted by rho(H; a), of a Hamiltonian function H as the mini-max value of the action functional A(H) over the Novikov Floer cycles in the Floer homology class dual to the quantum cohomology class a. The spectrality axiom of the invariant rho(H; a) states that the mini-max value is a critical value of the action functional AH. The main purpose of the present paper is to prove this axiom for nondegenerate Hamiltonian functions in irrational symplectic manifolds (M, omega). We also prove that the spectral invariant function rho(a) : H (sic) rho(H; a) can be pushed down to a continuous function defined on the universal (etale) covering space (sic)(M,omega) of the group Ham(M,omega) of Hamiltonian diffeomorphisms on general (M, omega). For a certain generic homotopy, which we call a Cerf homotopy H = {H(s)}(0 <= s <= 1) of Hamiltonians, the function rho(a) circle H : s (sic) rho(H(s); a) is piecewise smooth away from a countable subset of [0,1] for each non-zero quantum cohomology class a. The proof of this nondegenerate spectrality relies on several new ingredients in the chain level Floer theory, which have their own independent interest: a structure theorem on the Cerf bifurcation diagram of the critical values of the action functionals associated to a generic one-parameter family of Hamiltonian functions, a general structure theorem and the handle sliding lemma of Novikov Floer cycles over such a family and a family version. of new transversality statements involving the Floer chain map, and many others. We call this chain level Floer theory as a whole the Floer mini-max theory.X118sciescopuskc
The role of targeted temperature management before organ transplantation
No full textThis study aimed to investigate the clinical course of brain death donors and admitted through the emergency department before organ procurement and early outcomes of kidney transplantation. We retrospectively reviewed the medical records of patients who visited a single tertiary emergency department with the final diagnosis of brain death and donor procurement between January 2013 and January 2022. Donors were categorized into 3 groups: brain hemorrhage, hanging, and other medical causes. The primary outcome was the variation in the intensive care unit length of stay (LOS) across these groups. Secondary outcomes included organ procurement rates and factors influencing transplantation protocols, such as transplanted organs, age, sex, body mass index, cardiac arrest events, laboratory findings, and serial recipient laboratory results after organ transplantation. Medical records of 257 donors and 94 recipients for kidney transplantations were collected. The brain hemorrhage, hanging and other medical causes groups comprised 173 (67.3%), 53 (20.6%), and 31 (12.1%) patients, respectively. Of these, 102 patients (39.7%) experienced cardiac arrest before brain death. Targeted temperature management (TTM) was performed in 53 patients (20.6%). The mean time to organ procurement was 8.8 +/- 6.4 days; the hemorrhage, hanging, and other medical causes groups averaged 6.9 +/- 6.1, 7.1 +/- 5.1, and 8.6 +/- 5.1 days, respectively, with no significant differences (P = .29). However, TTM and non-TTM groups differed, averaging 10.9 +/- 6.9 vs 8.2 +/- 6.1 days (P = .013). The Kaplan-Meier curve indicated significant differences in LOS between these groups (P < .001). Before organ procurement, the TTM group's donors' sodium levels were better controlled at 143.4 +/- 10.3 vs 150.1 +/- 19.9 (P < .05). Consequently, the recipients' creatinine levels were lower than the non-TTM group on postoperative day 7 (1.68 +/- 0.82 vs 2.67 +/- 2.57; P < .01). The time to organ transplantation did not differ between the groups. However, the TTM group had a 2.7-day longer intensive care unit LOS before organ procurement than the non-TTM group. Before organ procurement, the TTM groups showed well-controlled sodium levels, and the kidney recipient group that received kidneys from the TTM group showed lower creatinine levels on postoperative day 7. It may represent more precise electrolyte imbalance management in post-cardiac arrest care using TTM
Continuous Hamiltonian dynamics and area-preserving homeomorphism group of D2
No full textThe main purpose of this paper is to propose a scheme of a proof of the nonsimpleness of the group {\rm Homeo}^\Omega(D^2,\del D^2) of area preserving homeomorphisms of the 2-disc . We first establish the existence of Alexander isotopy in the category of Hamiltonian homeomorphisms. This reduces the question of extendability of the well-known Calabi homomorphism \Cal: {\rm Diff}^\Omega(D^1,\del D^2) \to \R to a homomorphism \overline \Cal: {\rm Hameo(}D^2,\del D^2) \to \R to that of the vanishing of the basic phase function , a Floer theoretic graph selector constructed in \cite{oh:jdg}, that is associated to the graph of the topological Hamiltonian loop and its normalized Hamiltonian on that is obtained via the natural embedding . Here {\rm Hameo(}D^2,\del D^2) is the group of Hamiltonian homeomorphisms introduced by M\"uller and the author \cite{oh:hameo1}. We then provide an evidence of this vanishing conjecture by proving the conjecture for the special class of \emph{weakly graphical} topological Hamiltonian loops on via a study of the associated Hamiton-Jacobi equation.1111Ysciescopuskc
- …
