Ambiguity is a major characteristic of Persian contemporary poetry. It does not mean that the Persian classic poets did not use it, but it means that ambiguity is a necessary mean for contemporary poets to discover the modern world. Though the classic poets did not feel this necessity, the contemporary poets believe that the modern world is too complicated and ambiguity is an imperative for discovering and depicting it.

In this paper, one of the obvious psychological attributes of entrepreneurs that are ambiguity endurance is described by divergent and entrepreneurial thinking. So this characteristic is investigated and analyzed from different and new points, by designing some questions about tolerance, ambiguity and they way of cope with them. These questions would not be answered in this paper but will help the reader to know entrepreneurs.

Background: Fast and precise detection of SARS-CoV-2 RNA in clinical samples and subsequent quarantine are two critical factors in preventing virus transmission and distribution through the community. The false-negative result is a major problem in the SARSCoV-2 detection because of the kind of sample (swab sample), sampling error, and sensitivity of PCR test, which can be reduced by a much more sensitive test such as nested PCR. Objectives: This study aimed to evaluate the false-negative rate among samples that were negative by a real-time PCR test using RT-nested PCR. Methods: One hundred eighty-four negative samples were included in the study, and nucleic acid was extracted using a commercial kit based on a silica filter column and then subjected to RT-nested PCR using three sets of primers targeting Orf1ab, N, and RdRp regions. Results: Among 184 negative swab samples for SARS-CoV-2, 27 (14. 6%) cases were positive for the Orf1ab gene using RT-nested PCR. The samples were tested using N and RdRp primer sets. Also, seven (3. 8%) cases were positive for the N gene, and four (2. 1%) cases were positive for the RdRp gene. Conclusions: The results indicated that RT-nested PCR could be more sensitive than real-time PCR and reduce the false-negative rate.

Two experiments investigated the false memory effect (the Deese - Roediger - McDermott paradigm) among the Iranian population. In experiment 1, subjects studied list of semantically associated words. In experiment 2 which was an extension of the afore - mentioned paradigm, lists of linedrawings of semantically associated words were presented. In both experiments, a high rate of false recall and false recognition was observed. The findings suggest that a) - the effect is replicable among the Iranian population and b) - it can be generalized to pictorial stimuli. The results are discussed in terms of the network theories.

Language is one of the most important and beautiful phenomena in the world and is one of Gods' manifestations. Its investigation could reveal some mysteries of the world.One of the prominent figures in the Persian literature is Hafez who has skillfully used the delicacies of speech to manifest his ideas and points of View. In Hafezs' poetry, ambiguity plays an important role. The present paper has made an attempt to investigate this issue.

Fixing integer ambiguities is a non-trivial problem, especially if we aim at computational efficiency and high performance (or success rate). For this reason it has been a rich source of Global Positioning System (GPS) research over the last decade. A brief review of ambiguity resolution using the method of Least-Squares AMBiguity De-correlation Adjustment (LAMBDA) and rapid GPS ambiguity resolution for short and long baseline (KTH method) is presented in this article. It continues with some numerical comparisons between two methods with real (float) and simulated GPS data. Finally, we end the paper with conclusions and some remarks.  This comparison shows that the results of ambiguity resolution for short baselines are exactly the same using the KTH, LAMBDA and Trimble Total Control (TM) software. Also, for very long baselines these methods and software were not successful in solving ambiguities. However, the success rate of Trimble Total Control software was lower than for the others. This research also shows the exact effect of ionosphere in ambiguity resolution techniques. Any improvement in this area can improve the quality of ambiguity resolution significantly. More research with extra GPS observations in different conditions must be made for better results in the future.

Translating ambiguities, especially the ambiguities of the Qur'an as a sacred text has  always proved difficult because the style and methods used in Qur'anic ambiguities are flawless,consistent and rhetorical. The present article examines the translation of ambiguity in Persian and Chinese, to first determine how translators deal with the category of ambiguity and secondly to examine the differences between the two languages in cultural choices. For this purpose, among the Persian translations, an ancient translation - the translation of Abolfotuh Razi - and a contemporary translation - the translation of Garmaroodi - and among the Chinese translations, the translation of "Suleiman Bai zhisuo" has been selected. Thefindings indicate that Razi, in the face of multiple aspects of a word or ambiguous structure, usually chooses one aspect while omiting other aspects. Garmaroodi is more focused on conveying the semantic plurality in the original text using footnotes and parenthesis while Suleiman focuses on conveying a vague word or structure in Chinese.