Finite Density Algorithm in Lattice QCD -- a Canonical Ensemble Approach

I will review the finite density algorithm for lattice QCD based on finite chemical potential and summarize the associated difficulties. I will propose a canonical ensemble approach which projects out the finite baryon number sector from the fermion determinant. For this algorithm to work, it requires an efficient method for calculating the fermion determinant and a Monte Carlo algorithm which accommodates unbiased estimate of the probability. I shall report on the progress made along this direction with the Pad\'{e} - Z$_2$ estimator of the determinant and its implementation in the newly developed Noisy Monte Carlo algorithm.Comment: Invited talk at Nankai Symposium on Mathematical Physics, Tianjin, Oct. 2001, 18 pages, 3 figures; expanded and references adde

Critical point of Nf=3N_f = 3 QCD from lattice simulations in the canonical ensemble

A canonical ensemble algorithm is employed to study the phase diagram of $N_f = 3$ QCD using lattice simulations. We lock in the desired quark number sector using an exact Fourier transform of the fermion determinant. We scan the phase space below $T_c$ and look for an S-shape structure in the chemical potential, which signals the coexistence phase of a first order phase transition in finite volume. Applying Maxwell construction, we determine the boundaries of the coexistence phase at three temperatures and extrapolate them to locate the critical point. Using an improved gauge action and improved Wilson fermions on lattices with a spatial extent of 1.8 \fm and quark masses close to that of the strange, we find the critical point at $T_E = 0.925(5) T_c$ and baryon chemical potential $\mu_B^E = 2.60(8) T_c$.Comment: 5 pages, 7 figures, references added, published versio

Modeling Coastal and Estuarine Processes for Coastal Flood Management and Erosion Protection against Storms

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Evaluating Emergency ENT Admissions In Two Scottish Teaching Hospitals

Introduction: Ear, Nose and Throat (ENT) emergencies are common in all communities, with significant regional variations in published literature. Early diagnosis and prompt management results in reduction in morbidity and mortality. The management of ENT emergencies requires significant financial resources for admissions and surgical interventions. An awareness of the pattern of admissions will facilitate strategic planning of a department’s activity. Objective: To evaluate the pattern of emergency ENT admissions to our department. Our objectives were to register the common admission diagnoses; record the equipment required in the ward treatment room and to identify training requirements for nursing and medical staff involved in their management. Methods: Retrospective analysis of a prospectively maintained departmental database. All emergency admissions to our department over 8 years were recorded. The data collected included patients’ demographics and admission diagnoses. Results: The total patients identified were 3878 with 56% (2185) male and 44% (1693) female. The majority of the patients admitted had a diagnosis in the head and neck sub group (58%). Over the study period on average 41 emergency admissions were recorded per month. The commonest emergency requiring admission was epistaxis, followed by acute sore throat. Conclusions: The most common adult ENT emergencies requiring admission to our unit are epistaxis, quinsy and post-tonsillectomy complications

Study on River Migration and Stable Water Supply Countermeasure in the Reach of Kaoping Weir

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Strangeness Content in the Nucleon

I review recent studies of strangeness content in the nucleon pertaining to the flavor-singlet $g_A^0$, the $\bar{s}s$ matrix element and the strangeness electric and magnetic form factors $G_E^s(q^2)$ and $G_M^s(q^2)$, based on lattice QCD calculations. I shall also discuss the relevance of incorporating the strangeness content in nuclei in regard to strange baryon-antibaryon productions from proton-nucleus and nucleus-nucleus collisions at SPS and RHIC energies.Comment: 11 pages, 4 figures, Invited talk at V Int. Conf. on Strangeness in Quark Matter, Berkeley, CA, July 20--25, 200