き裂型貯留層における3次元チャネリングフロー

Tohoku University土屋範芳課

Theories for correlating impedance computations with beam-based measurements in electron storage rings

As a stationary solution of the Vlasov-Fokker-Planck equation, the Haissinski equation predicts the equilibrium line density of a bunch circulating in a storage ring for a given wake function. Here, we show that, from the Haissinski equation, a few principles can be derived in a sef-consistent way and provide assistance in connecting impedance computations to beam-based measurements at electron storage rings.Comment: 5 pages, 6 figure

Heat Transfer Characteristics of the Non-uniform Grooved Tube considering Tube Expansion

A plate-fin heat exchanger is a type of heat exchanger widely used in air conditioners, and tubes and fins are tightly assembled by the mechanical expansion process of tubes. The tube expansion process deforms the grooves inside the tube, and the groove shapes also affect the adhesion between tubes and fins. In this study, the adhesion and heat transfer performance affected by the tube expansion of the non-uniform groove shape tube with different heights are investigated by both analysis and experiments. From the analysis method, it was shown that the contact pressure of non-uniform groove tube is higher than that of the uniform groove tube, and the most appropriate high groove number of the non-uniform groove tube is designed for the maximum contact pressure. From the experimental results, the decreasing rate of the condensation heat transfer coefficient is smaller in the non-uniform groove tube with different heights, compared to the conventional uniform groove tube. Also, the air-side heat transfer coefficient of the non-uniform groove tube with different heights is higher than that of the uniform groove tubes

Potential-well bunch lengthening in electron storage rings

The cubic equation derived by B. Zotter has been popularly used for electron storage rings to describe the scaling law of potential-well bunch lengthening. This equation has also often been used to calculate the effective impedance when the bunch lengthening is measured or simulated. This paper discusses the validity of Zotter's equation and presents an alternative but self-consistent equation for potential-well bunch lengthening. Its applications to predicting bunch lengthening and extracting effective impedance from bunch length measurements are also addressed.Comment: 6 pages, 4 figures, submitted to 20th Annual Meeting of Particle Accelerator Society of Japan (PASJ2023). arXiv admin note: text overlap with arXiv:2307.0128

Development of Flat Tube Heat Exchanger for Heat Pump Air Conditoner

We developed a new type of a heat pump outdoor unit using an aluminum flat tube heat exchanger in order to improve the energy saving capability of an air conditioner. There are several difficulties in keeping a desired drainage performance, frost formation performance, as well as even distribution of refrigerant, when applying the flat tube heat exchanger to heat pump outdoor units. In order to achieve the same drainage performance and the frost formation performance as those of conventional heat exchangers, we have adopted new plate fins with ellipse cutouts. Flat tubes were inserted in the ellipse cutouts, and the slit position on a plate fin was properly adjusted. In order to achieve the even distribution of refrigerant, an aluminum distributor and 3-way pipes were installed to the evaporator. In this report, first we describe features of the flat tube heat exchanger. Next, we present and explain experimental results of the air-side heat transfer coefficient and the air-side pressure drop on the condition of dry, wet, and frost state respectively. Moreover, we present experimental results of the total heat transfer performance, including the refrigerant performance, under the conditions of the condensation and the evaporation. Finally, we explain the heat transfer performance and the effect of the flat tube heat exchanger to a conventional one in the case that the developed heat exchanger was mounted in heat pump outdoor unit

Pemphigus Vulgaris with Marked Stenosis of the Esophageal Orifice from an Osteoporosis Drug: a Case Study with Long-term Follow-up

Pemphigus vulgaris produces multiple and intractable erosions of the oral mucosa in the head and neck region. We describe a case of pemphigus vulgaris that showed erosions in the hypopharynx and stenosis of the esophageal orifice from an osteoporosis drug. A 73-year-old woman was admitted with oral intake difficulty and erosions in the hypopharynx. During the first admission, we could not make a definite diagnosis by biopsy or blood examination. The condition of the mucosa worsened subsequently; an esophagram showed marked stenosis of the esophageal orifice. As a possible factor exacerbating the stenosis, an osteoporosis drug was considered. The stenosis was improved by balloon expansion. One year after the first medical examination, we finally made a definite diagnosis of pemphigus vulgaris from the results of a blood examination in which anti-desmoglein 3 turned positive when the hypopharyngeal erosions and stenosis of the esophageal orifice became worse. Systemic treatment with a steroid was effective for the control of pemphigus vulgaris; restenosis of the esophageal orifice was recognized twice during a state of remission, and careful follow-up will be necessary in the future

Characterizing Reaction Route Map of Realistic Molecular Reactions based on Weight Rank Clique Filtration of Persistent Homology

A reaction route map (RRM) constructed using GRRM program is a collection of elementary reaction pathways, each of which consists of two equilibrium (EQ) geometries and one transition-state (TS) geometry, connected by the intrinsic reaction coordinate (IRC). An RRM can be mathematically represented by a graph with weights assigned to both vertices, corresponding to EQs, and edges, corresponding to TSs, representing the corresponding energies. In this study, we propose a method to extract topological descriptors of a weighted graph representing an RRM based on persistent homology (PH). The work of Mirth et al. [J. Chem. Phys. 2021, 154, 114114], in which PH analysis was applied to the (3N-6)-dimensional potential energy surface of an N atomic system, is related to the present method, but the latter is practically applicable to realistic molecular reactions. The results of this study suggest that the descriptors obtained using the proposed method reflect the characteristics of the chemical reactions and/or physicochemical properties of the system accurately.Comment: 38 pages, 19 figure

Implementation of a Strongly Robust Identity-Based Encryption Scheme over Type-3 Pairings

Identity-based encryption (IBE) is a powerful mechanism for maintaining security. However, systems based on IBE are unpopular when compared with those of the public-key encryption (PKE). In our opinion, one of the reasons is a gap between theory and practice. For example, a generic transformation of weakly/strongly robust IBE from any IBE has been proposed by Abdalla et al., no robust IBE scheme is explicitly given. This means that, theoretically, anyone can construct a weakly/strongly robust IBE scheme by employing this transformation. However, this seems not easily applicable to non-cryptographers. In this paper, we first introduce the Gentry IBE scheme constructed over Type-3 pairings by employing the transformation proposed by Abe et al., and second we explicitly give strongly/weakly robust Gentry IBE schemes by employing the Abdalla et al. transformation. Finally, we show its implementation result and show that we can add strong robustness to the Gentry IBE scheme with a very few additional costs. We employ the mcl library to support a Barreto-Naehrig curve defined over the 462-bit prime. The encryption requires about 5 ms, whereas the decryption requires about 9 ms

The Molecular Mechanism Underlying Continuous Exercise Training-Induced Adaptive Changes of Lipolysis in White Adipose Cells

Physical exercise accelerates the mobilization of free fatty acids from white adipocytes to provide fuel for energy. This happens in several tissues and helps to regulate a whole-body state of metabolism. Under these conditions, the hydrolysis of triacylglycerol (TG) that is found in white adipocytes is known to be augmented via the activation of these lipolytic events, which is referred to as the “lipolytic cascade.” Indeed, evidence has shown that the lipolytic responses in white adipocytes are upregulated by continuous exercise training (ET) through the adaptive changes in molecules that constitute the lipolytic cascade. During the past few decades, many lipolysis-related molecules have been identified. Of note, the discovery of a new lipase, known as adipose triglyceride lipase, has redefined the existing concepts of the hormone-sensitive lipase-dependent hydrolysis of TG in white adipocytes. This review outlines the alterations in the lipolytic molecules of white adipocytes that result from ET, which includes the molecular regulation of TG lipases through the lipolytic cascade