Search

Sequence identification and division is an important basis for oil and gas exploration research. In view of the complex sedimentary environment, based on the previous element logging correction lithology, through the combination of logging curve and lithology data, in this paper, two methods of maximum entropy spectrum analysis and wavelet transform are used to identify the logging curve and divide the interface, and the high-resolution sequence identification of migmatite in the study area was completed. Compared with AC and SP logging curves, the overall and local trend inflection points of INPEFA-GR curve can improve the accuracy of medium-term and short-term cycle interface identification; wavelet transform and time–frequency spectrum analysis of different scale factors can realize the identification and comparison of medium-term and short-term cycle interfaces. The results show that maximum entropy spectrum analysis is more suitable for determining the third-level and fourth-level sequence interfaces. Wavelet transform is more suitable for the division of fifth-level sequences. By comparing and adjusting the two methods, the lower Es3 of KL Oilfield in Laizhouwan Sag can be divided into 1 long-term base-level cycle, 3 medium-term base-level cycle and 8 short-term base-level cycle. This study has certain reference significance for the construction of sequence stratigraphic framework in migmatite area and helps to better describe the reservoir. [ABSTRACT FROM AUTHOR]

We introduce SemDiff, a novel technology for finding semantic differences between two binary files. Now, the vendor will release the information to patch the previous version which has vulnerability. Then, we can compare the differences and similarities between the two versions to get the unpublished details of the 1day vulnerabilities. Tools, such as BinDiff, BinHunt and iBinHunt, have worked on this project before, however, there are some weaknesses on them. Just like BinDiff, a comparison method based on structure, can not be effective for judging the semantic differences. Though the other two tools(BindHunt and iBinHunt) can recognize the differences we focus on, they can not effectively verify the functional inlining and spend a pretty long time to finish the process because the use of graph-based isomorphism algorithm. In the paper, we first propose SemDiff, which uses the existing tool(angr) to generate the intermediate language(VEX). Then, because of the nature of program, the data read from and written to the memories, we record these information to implement the comparison. Last, an improved BinDiff algorithm is used to match the basic blocks. In this paper, we take some real vulnerabilities as examples, such as CVE-2010-3974-Microsoft Windows to test our tool, reaching a good goal, matching more blocks than BinDiff and taking less time than BinHunt and iBinHunt.

Main observation and conclusion: A new dual palladium/scandium catalysis starting from β‐alkynyl ketones and o‐alkynyl anilines is reported for the first time, leading to the atom‐economic synthesis of rotationally hindered C3‐naphthylated indoles in moderate to good yields and high regioselectivity. This method can tolerate normal air conditions, and features the use of palladium/scandium cooperative catalysts without any ligand, facile double annulation involving various internal alkynes, and good functional group tolerance. [ABSTRACT FROM AUTHOR]

Tunable catalytic annulation reactions of β alkynyl ketones with indoles have been developed, enabling multiple chemical bond‐forming events to selectively access skeletally diverse indole‐containing heterocycles with generally good yields. Silver‐catalyzed intermolecular benzannulation reaction of β‐alkynyl ketones with indoles afforded tetracyclic benzo[b]carbazoles whereas isochromen‐1‐yl‐substituted indoles could be obtained using the same silver catalysis by lowering the reaction temperature (0 °C or rt). Interestingly, using Sc(OTf)3 and AgOTf as a combined catalytic system led to the formation of C3‐naphthylated indoles via intramolecular benzannulation reaction. [ABSTRACT FROM AUTHOR]