THE IMPACT OF ATTAGENUS SMIRNOVI ON CULTURAL AND DOMESTIC ASSETS: CHALLENGES AND SOLUTIONS
The study examines the destructive effects of Attagenus smirnovi (the brown carpet beetle) on both cultural heritage sites and household assets. Special attention is given to historical monuments and museum collections, where the beetle causes significant damage to organic materials such as wool,...

Actual problems of Natural Sciences / 2025 / July

Atajanova Shirin Masharibovna, Abdullaev Ikram Iskandarovich

Volume 9 | Issue 7

3 July 2025, 21:50

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SYNTHESIS AND ANALYSIS RESULTS OF THE 1,10-PHENANTHROLINETRIS(2-AMINO-5-ETHYLTHIO-1,3,4-THIADIAZOLE) COPPER(II) PERCHLORATE COMPLEX COMPOUND OBTAINED USING 2-AMINO-5-ETHYLTHIO-1,3,4-THIADIAZOLE AND 1,10-PHENANTHROLINE LIGANDS
This article presents the synthesis method and structural study of a new 1,10-phenanthroline-tris(2-amino-5-ethylthio-1,3,4- thiadiazole)copper(II)perchlorate complex formed with copper perchlorate and the ligands 2-amino-5-ethylthio-1,3,4-thiadiazole and 1,10-phenanthroline. The structure of the...

Actual problems of Natural Sciences / 2025 / July

Matmuratova Zulayxo Ikromboy Kizi

Volume 9 | Issue 7

3 July 2025, 21:50

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SYNTHESIS AND STUDY OF THE COORDINATION COMPOUND OF ZINC NITRATE WITH KETOROLAC
This article presents the synthesis and physicochemical characterization of a novel coordination compound formed from zinc nitrate and ketorolac. The compound [Zn(ket)2](NO3)2·2H2O was synthesized in a water–ethanol mixture under pH conditions of 5.5–6 and precipitated as white crystals....

Actual problems of Natural Sciences / 2025 / July

Karimova Momojon Egamberganovna, Ismailova Shahla Atanazarovna, Khudoyberganov Oybek Ikromovich

Volume 9 | Issue 7

3 July 2025, 21:50

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ANNEALING-INDUCED PHASE EVOLUTION AND MORPHOLOGICAL CONTROL IN RF-SPUTTERED VO2 THIN FILMS
This study investigates the influence of annealing temperature (200–500 °C) and atmosphere (air vs. oxygen) on the properties of VO2 thin films deposited by RF magnetron sputtering. XRD analysis revealed a mixed-phase composition (VO2/V2O5), with oxygen annealing promoting preferential VO2growth at...

Actual problems in modern technical sciences / 2025 / July

Bunyod Allabergenov, Farangis Allabergenova, Uchqun Kutliev, Sungjin Kim

Volume 9 | Issue 7

3 July 2025, 21:50

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STATISTICAL WORD IMPORTANCE MODELING FOR UZBEK TEXT SUMMARIZATION: A TF-IDF-BASED APPROACH WITH IMPROVED SENTENCE SELECTION
Summarization is a central activity in the field of Natural Language Processing that makes it possible to extract essential information from a massive amount of text with minimal preservation of key meaning. But in the case of the Uzbek language, summarization is a weak field because it is an...

Actual problems in modern technical sciences / 2025 / July

Khabibulla Madatov

Volume 9 | Issue 7

3 July 2025, 21:50

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DESIGN AND IMPLEMENTATION OF A MODEL AND ALGORITHM FOR PART-OF-SPEECH TAGGING IN UZBEK TEXTS USING THE CONDITIONAL RANDOM FIELDS (CRFs) APPROACH
This paper presents a part-of-speech tagging system for the Uzbek language based on the Conditional Random Fields (CRF) approach. Using a manually annotated corpus and a set of language-specific morphological and contextual features, the model was trained and evaluated through 5-fold...

Actual problems in modern technical sciences / 2025 / July

Sharipov Maksud

Volume 9 | Issue 7

3 July 2025, 21:50

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SYNTHESIS AND SURFACE MORPHOLOGY STUDY OF VANADIUM OXIDE THIN FILMS
Vanadium oxide (VOx) thin films were synthesized using DC magnetron sputtering with a vanadium target prepared by spark plasma sintering (SPS) at 900 °C under Ar+H2 atmosphere. Amorphous VOx films were deposited on glass substrates and annealed in air and oxygen atmospheres at 200–500 °C to study...

Actual problems in modern technical sciences / 2025 / July

Bunyod Allabergenov, Farangis Allabergenova, Uchqun Kutliev, Sungjin Kim

Volume 9 | Issue 7

3 July 2025, 21:50

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BROMATION REACTIONS OF 2-ARYLQUINOLINE DUBAMINE
The results of the bromination reaction of the 2-arylquinoline alkaloid dubamine with N-bromosuccinimide and molecular bromine are presented in this paper. Dubamine was reacted with N-bromosuccinimide in DMF to obtain bromdubamine with a yield of 78.4%. However, when reacting with molecular bromine...

Actual problems of Natural Sciences / 2024 / July

Niyazmetov Azamat Rahmatjonovich

Volume 8 | Issue 7

3 July 2024, 21:50

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IMPACT OF CLIMATE CHANGE ON LANDSCAPES OF KHOREZM REGION
Khorezm region has long been known for its colorful and vibrant landscapes, from lush green river valleys to arid desert expanses. However, this delicate balance has become increasingly important in recent decades due to the increasing effects of climate change. This scientific article examines the...

Actual problems of Natural Sciences / 2024 / July

Aminov Bekhzod Bakhram Ugl

Volume 8 | Issue 7

3 July 2024, 21:50

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DEVELOPMENT OF SOCIOLINGUISTIC COMPETENCE IN PEDAGOGICAL PRACTICE
This article examines sociolinguistic competence as a vital element of effective communication and pedagogical practice. It analyzes the structure of sociolinguistic competence, which includes knowledge of cultural traditions and norms, as well as the ability to adapt speech according to the...

Actual problems in modern pedogogy and pshychology / 2024 / July

Ibragimova Nazokat Muxtarovna

Volume 8 | Issue 7

3 July 2024, 21:50

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