Effect of the chosen incision on corneal astigmatism after implantable collamer lens surgery

AIM: To evaluate the effect of the chosen incision on corneal astigmatism after implantable collamer lens(ICL)surgery.<p>METHODS: The study included 195 eyes of 102 patients, and all eyes were randomly divided into two groups: the chosen incision group(Group A, 97 eyes)and temporal corneal incision(Group B, 98 eyes). Before the operation, and 1wk,1mo and 3mo after the operation, each patient was examined with corneal topography to observe the changes of corneal astigmatism. <p>RESULTS: Preoperative corneal astigmatisms were(1.26±0.35)D in group A and(1.28±0.38)D in group B, thus there was no statistically significant difference(<i>P</i>>0.05). One week postoperatively, the astigmatism were(0.93±0.29)D in group A and(1.32±0.33)D in group B. One month postoperatively, the astigmatism were(0.85±0.16)D in group A and(1.27±0.18)D in group B. Three months postoperatively, the astigmatism were(0.80±0.13)D in group A and(1.25±0.20)D in group B. The differences between the two groups were statistically significant(<i>P</i><0.01). <p>CONCLUSION: The chosen incision can reduce postoperative astigmatism to a certain extent after ICL surgery

TPM: A GPS-based Trajectory Pattern Mining System

With the development of big data and artificial intelligence, the technology of urban computing becomes more mature and widely used. In urban computing, using GPS-based trajectory data to discover urban dense areas, extract similar urban trajectories, predict urban traffic, and solve traffic congestion problems are all important issues. This paper presents a GPS-based trajectory pattern mining system called TPM. Firstly, the TPM can mine urban dense areas via clustering the spatial-temporal data, and automatically generate trajectories after the timing trajectory identification. Mainly, we propose a method for trajectory similarity matching, and similar trajectories can be extracted via the trajectory similarity matching in this system. The TPM can be applied to the trajectory system equipped with the GPS device, such as the vehicle trajectory, the bicycle trajectory, the electronic bracelet trajectory, etc., to provide services for traffic navigation and journey recommendation. Meantime, the system can provide support in the decision for urban resource allocation, urban functional region identification, traffic congestion and so on

On Weak Exponential Expansiveness of Evolution Families in Banach Spaces

The aim of this paper is to give several characterizations for the property of weak exponential expansiveness for evolution families in Banach spaces. Variants for weak exponential expansiveness of some well-known results in stability theory (Datko (1973), Rolewicz (1986), Ichikawa (1984), and Megan et al. (2003)) are obtained

Note On Certain Inequalities for Neuman Means

In this paper, we give the explicit formulas for the Neuman means $N_{AH}$, $N_{HA}$, $N_{AC}$ and $N_{CA}$, and present the best possible upper and lower bounds for theses means in terms of the combinations of harmonic mean $H$, arithmetic mean $A$ and contraharmonic mean $C$.Comment: 9 page

1-(3,4-Dihydroxy­phen­yl)-2-(4-fluoro­phen­yl)ethanone

In the title compound, C14H11FO3, the dihedral angle between the aromatic rings is 69.11 (8)°. An intra­molecular O—H⋯O hydrogen bond is present. Inter­molecular O—H⋯O inter­actions help to establish the packing

Preconditioned WR–LMF-based method for ODE systems

AbstractThe waveform relaxation (WR) method was developed as an iterative method for solving large systems of ordinary differential equations (ODEs). In each WR iteration, we are required to solve a system of ODEs. We then introduce the boundary value method (BVM) which is a relatively new method based on the linear multistep formulae to solve ODEs. In particular, we apply the generalized minimal residual method with the Strang-type block-circulant preconditioner for solving linear systems arising from the application of BVMs to each WR iteration. It is demonstrated that these techniques are very effective in speeding up the convergence rate of the resulting iterative processes. Numerical experiments are presented to illustrate the effectiveness of our methods

Deltaline from Delphinium delavayi Franch

The title compound [systematic name: 6β,10-dihy­droxy-1α,14α,16β-trimeth­oxy-4-methyl-7β,8-(methyl­enedi­oxy)-20-ethyl­aconitan-6-yl acetate], C27H41NO8, is a C19-diterpenoid alkaloid and a major diterpenoid alkaloid component of the roots of Delphinium delavayi Franch. var. pogonanthum (Hand.-Mazz.) W. T. Wang. The mol­ecule has a lycoctonine carbon-atom skeleton with four six-membered rings and three five-membered rings among; three of the six-membered rings adopt chair conformations with the fourth adopting a boat conformation while all of the five-membered rings exhibit envelope conformations. Inter­molecular O—H⋯O hydrogen bonding is present in the crystal structure

Developer-Intent Driven Code Comment Generation

Existing automatic code comment generators mainly focus on producing a general description of functionality for a given code snippet without considering developer intentions. However, in real-world practice, comments are complicated, which often contain information reflecting various intentions of developers, e.g., functionality summarization, design rationale, implementation details, code properties, etc. To bridge the gap between automatic code comment generation and real-world comment practice, we define Developer-Intent Driven Code Comment Generation, which can generate intent-aware comments for the same source code with different intents. To tackle this challenging task, we propose DOME, an approach that utilizes Intent-guided Selective Attention to explicitly select intent-relevant information from the source code, and produces various comments reflecting different intents. Our approach is evaluated on two real-world Java datasets, and the experimental results show that our approach outperforms the state-of-the-art baselines. A human evaluation also confirms the significant potential of applying DOME in practical usage, enabling developers to comment code effectively according to their own needs

Impact Of Urbanization On Spatial And Temporal Variation Of Rainfall In Beijing Over The Last 50 Years

Rainfall is one of the key terms involved in many hydrological processes, and it is particularly important in the field of urban hydrology. It is well known that urbanization can have potential impact on precipitation process due to the changes it causes to the ground roughness, thermal-dynamics and many other factors. In this study, the focus is set on the impact on the precipitation patterns in Beijing in term of spatial and temporal variation, from the urbanization over last 50 years in which time the fast and continuous expansion of the city at dramatic scales, the rapid growth of residents population as well as human activities especially building of ground constructions, collectively and inevitably bring changes to the local climatic characteristics of the urbanized areas. This study looks at the two periods according to the speed of urbanization, namely the slow urbanization period of 1957-1980 and the fast urbanization period of 1981-2010. Rainfall data collected from the representative rain gauges across the region is used to analyze the spatial and temporal variation over these two periods. The results show that precipitation in urban areas exhibits the characteristics of higher intensity, shorter duration, with the rainfall mainly concentrated in 60 min or so. Local short-duration rainstorms tend to occur more frequently. Compared with suburban areas, urbanization has significant effect, especially on short-duration precipitation events evidenced by remarkable difference between the coefficients of variation of urban rainfall and those of the suburbs. In addition, for the fast urbanization period, the spatially localized, highly intensive rainfall events are found to be more frequent. Therefore, urbanization of the city has caused increase of the strong convective weather and pressure of flood control drainage, which should be paid more attentions to in city planning