Abstract: In accordance with some embodiments, systems, methods, and media for fault localization in declarative specification languages are provided. In some embodiments, a method comprises: receiving a model in a declarative specification language; querying an automated analysis of the declarative specification language for a counterexample, wherein the counterexample is an instance of the model that does not satisfy a property; using a partial max satisfiability solver to find an instance that satisfies the property; determining one or more differences in an expression from the model between the counterexample and the satisfying instance; analyzing the differences between the counterexample and the satisfying instance; determining a suspicion score for the expression in the model; and causing the suspicion score to be presented.

Abstract: A bolt and a method for manufacturing the bolt are provided. The bolt includes a screw cap and a bolt bar, the bolt bar includes a positioning bar, a flexible bar and a threaded portion, the positioning bar is connected to one end of the screw cap, and the flexible bar is connected to the positioning bar and the threaded portion respectively. Wherein, an anti-shearing stand is formed on the flexible bar. The threaded portion includes standard threads and transition threads, the transition threads are formed between the flexible bar and the standard threads, and a thread height of the transition threads is smaller than a thread height of the standard threads, wherein the thread height of the standard threads keeps constant. The force distribution of the threads can be optimized, and the threads can effectively cooperate with the threads of the nut.

Abstract: A bolt and a method for manufacturing the bolt are provided. The bolt includes a screw cap and a bolt bar, the bolt bar includes a positioning bar, a flexible bar and a threaded portion, the positioning bar is connected to one end of the screw cap, and the flexible bar is connected to the positioning bar and the threaded portion respectively. Wherein, an anti-shearing stand is formed on the flexible bar. The threaded portion includes standard threads and transition threads, the transition threads are formed between the flexible bar and the standard threads, and a thread height of the transition threads is smaller than a thread height of the standard threads, wherein the thread height of the standard threads keeps constant. The force distribution of the threads can be optimized, and the threads can effectively cooperate with the threads of the nut.