晋李彤《字指》佚文钩沉

《字指》是晋李彤撰写的一部字书,今已亡佚。目前我们所能见到的辑本共有8种,但诸家所辑佚文未经校勘,均有不同程度的讹误,且颇多重复。本文利用中土固有文献《经典释文》《文选注》《埤雅》以及域外传回文献《原本玉篇残卷》《一切经音义》《文选集注》《遊仙窟注》《倭名类聚抄》等的引用校勘佚文38条。按《说文》五百四十部首排录,并对前人所辑佚文进行辑校,以期还原更为准确、可靠的佚文材料。

WEIGHTED ALGORITHM FOR FINGERPRINTING RELATIONAL DATABASES

The necessity and the feasibility of introducing attribute weight into digital fingerprinting system are given. The weighted algorithm for fingerprinting relational databases of traitor tracing is proposed. Higher weights are assigned to more significant attributes, so important attributes are more frequently fingerprinted than other ones. Finally, the robustness of the proposed algorithm, such as performance against collusion attacks, is analyzed. Experimental results prove the superiority of the algorithm.

Photoelectric Instrument for Measuring the Geometrical Dimensions of the Bullet

A laser-scanning calibre measuring and digital indicating grating photosensor gauging systems are introduced,which are used to measure the dimensions of bullet.In the paper,we expound the operation principle and design idea of the principal parts and units.

Digital Forensic Analysis on Runtime Instruction Flow

Computer system＇s runtime information is an essential part of the digital evidence. Current digital forensic approaches mainly focus on memory and I/O data, while the runtime instructions from processes are often ignored. We present a novel approach on runtime instruction forensic analysis and have developed a forensic system which collects instruction flow and extracts digital evidence. The system is based on whole-system emulation technique and analysts are allowed to define analysis strategy to improve analysis efficiency and reduce overhead. This forensic approach and system are applicable to binary code analysis, information retrieval and matware forensics.

GENERATORS BY THE QUADRATIC EXPONENTIAL METHOD

Based on the quadratic exponential method, this paper constructs two types of generators over finite field Fq, the digital quadratic exponential generator and quadratic exponential pseudorandom vector generator. We investigate the distribution of the sequence generated by the generators, and present results about their one dimensional discrepancy. The proofs are based on the estimate of certain character sum over Fq. Ift is the least period of the sequence and t≥q^1/2＋2c, then the bound of the discrepancy is O（t^-1/4q^1/8＋τ logq） for any ε 〉 0. It shows that the sequence is asymptotically uniformly distributed.

Oil–water pre-separation with a novel axial hydrocyclone

A novel hydrocyclone with guide vanes, named as axial hydrocyclone(AHC), is designed to tackle the problem of oil–water separation faced by most mature oilfields. Optimal design of the AHC is carried out by using numerical methods. The effects of guide vanes, cone angle, tapered angle and overflow pipe on the oil–water separation are discussed in this paper. The results show that a double swirling flow is generated in the tapered section where oil–water separation occurs. Both the cylindrical and the tapered section have important influences on AHC performance. On the basis of single factor results, response surface methodology is employed to optimize the AHC design. The experimental results indicate that the novel AHC has an excellent performance for the oil–water separation.

A Study on Quantitative Evaluation of Calligraphy Characters

In this study, a numerical method was proposed to evaluate the calligraphy work called calligraphy evaluation system. Four classical chirographies of ＂Kaisho＂, ＂Gyosho＂, ＂Sousho＂ and ＂Hiragana＂, and 47 characters for each chirography, were selected and analyzed by this system. The ＂Sumi＂ distribution of character was clarified from 12 directions and summarized into four parts of horizontal part, diagonal left part, vertical part and diagonal fight part. The character＇s contour line was converted to a signal data in order to calculate roundness index. The degree of character＇s radian was presented by roundness index. The smooth index was calculated at the same time. Additionally, width index, ＂Sumi＂ ratio, stability index also were calculated to contrast the features of each style. The main character points of four styles of ＂Kaisho＇, ＂Gyosho＂, ＂Sousho＂, ＂Hiragana＂ were extracted to compare each other, and provide a reference for learners. The learners could obtain the quantitative data to understand their work＇s characteristics. It can also be compared with other person＇s work by this system in order to improve learners＇ writing skill.

REDEFINING ENSO EPISODES BASED ON CHANGED CLIMATE REFERENCES

Through studying changes in ENSO indices relative to change of climate reference from 1961~1990 to 1971~2000, the study generated new standards to define ENSO episodes and their intensities. Then according to the new climate references and new index standards, ENSO episodes and their intensities for the period 1951 -2003 have been classified. Finally, an analysis has been performed comparing the new characteristics with the old ones for ENSO period, peak values and intensities.

Numerical study on three-dimensional CJ detonation waves interacting with isotropic turbulence

The three-dimensional structures of a cellular detonation wave interacting with different turbulent flows were investigated using a one-step irreversible Arrhenius kinetics model. High-resolution bandwidth-optimized WENO scheme of spatial discretization and total variation diminishing temporal integration are used to solve the three dimensional chemically reactive Navier-Stokes equations. The turbulent vertical and entropic forcing effects on the three dimensional detonation wave structures and dynam- ics are analyzed, as well as the detonation effects on tur- bulent vortex structures. It has been found that the turbulence field imposed has created small scale wrinkles embedded in the detonation front, apart from the large scale features of detonation without turbulence. The deto- nation propagating velocity over the leading shock front varies from 0.8 to 1.6 times of CJ velocity and its proba- bility density function （pdf） skews towards sub-CJ velocity and peaks at about 0.9. The recorded detonation velocity always preferentially decays with time, with very rapid accelerations through triple point interactions. Its pdf also skews to sub-CJ velocity, while its overall shape agrees well with W3. The reaction zone is greatly influenced by the vortex, much more irregular and elongated for the turbulent cases. Distributed burning pockets are more likely to be found there. The turbulent kinetic energy is amplified across the detonation, and periodically oscillates downstream the detonation. The off-diagonal components of Reynolds stress also show a rapid rise across the deto- nation and present to be non-zero downstream of detona- tion. Vortex structures are compound results of the convected vortex and the generated vortex by the collision of triple points. The convection term and baroclinic gen- eration term in the transport equation of enstrophy are compared in detail.

Should few retrieved oocytes be as an indication for intracytoplasmic sperm injection?

Objective:To reevaluate whether relatively few oocytes obtained in one cycle are an indication for intracytoplasmic sperm injection(ICSI).Methods:A total of 406 cycles with three or fewer retrieved oocytes performed in 396 non-male infertile couples were retrospectively reviewed.Cycles were classified into three groups by different fertilization techniques:the in vitro fertilization(IVF) group,insemination with conventional IVF;the ICSI group,insemination with ICSI though semen parameters were normal;and the rescue ICSI group,re-insemination with ICSI after conventional IVF failure.Results:The ICSI group resulted in higher normal fertilization compared with the conventional IVF group.Correspondingly,the cycle cancellation rate was decreased in the ICSI group,though it was not statistically significant.The clinical pregnancy rate and implantation rate were lower in the ICSI group compared with the conventional IVF group.Rescue ICSI was a method to avert total fertilization failure in conventional IVF,increasing fertilization and ensuring embryo availability for transfer,but the normal fertilization was the lowest due to delayed insemination and the chance of pregnancy was very little.Conclusions:Obtaining only few oocytes in one cycle is not considered as an indication for ICSI when the sperm sample is apparently normal.Rescue ICSI is either not recommended if conventional insemination fails.Such patients should not be subjected to the unnecessary costs and potential risks of ICSI.