Journal of Bangladesh Academy of Sciences

The performance of Brillouin optical time domain analysis (BOTDA) sensors is largely deteriorated due to the poor signal-to-noise ratio (SNR) of Brillouin gain spectra (BGSs) collected from the BOTDA experiment. The fast monitoring of distributed temperature using BOTDA sensors is also vital for many longdistant applications. To cope with these requirements, this paper proposes total variation denoising (TVD) and Euclidean distance-based pattern recognition (TEPR) for high-performance BOTDA sensors. The performances of TEPR are analyzed explicitly, and rigorous comparisons have been made with traditional nonlinear least squares fitting (NLSF). The experimentally demonstrated results signify that the proposed TEPR can improve the measurement uncertainty by up to ~55% compared to NLSF without worsening the experimental spatial resolution. The signal processing for using TEPR is also ~4 times faster than that for using NLSF. Hence, the proposed technique is an efficient and reliable alternative for the fast and accurate monitoring of distributed temperature in BOTDA sensors. J. Bangladesh Acad. Sci. 46(2); 193-202: December 2022

Taskin Sakin

Tanbin Ahmed

Abul Kalam Azad

Total variation denoising and Euclidean distance based distributed temperature monitoring in Brillouin optical time-domain analysis sensors

基于全变差去噪和欧几里得距离的布里渊光时域分析传感器分布式温度监测

Bloodstream infections (BSI) are serious, life-threatening, and critical clinical conditions with high global human morbidity and mortality rates. This study aimed to determine the Gram-negative bacterial profiles and antimicrobial resistance patterns of acute bloodstream infections in rural patients. Three hundred forty-six blood samples were collected and analyzed with the BD BactecTM FX40 automated culture system, selective media culture, and biochemical parameters. Finally, antimicrobial susceptibility testing was performed using the disk diffusion method. The most common age group affected out of 51 cases was 41-60 years, with 20 patients (39.22%), and 1-15 years, with 2 patients (3.92%). Male patients were more susceptible (66.67%) than female patients. Among the isolates, E. coli was the most common, with 23 cases (45.1%); Cephradine was the most resistant antibiotic, and Imipenem was the most sensitive. Multiple drug-resistant pathogens were one of the most notable findings in our work. Our study will surely provide the best guide for properly treating antibacterial-resistant bacterial diseases and minimizing their critical mortality and morbidity. J. Bangladesh Acad. Sci. 46(2); 185-191: December 2022

Mohammad Zakerin Abedin

Md Muhaymenul Islam

Md Babul Aktar

Muhammad Irfanul Islam

Nowshin Tarannum

Laila Jarin

Zohora Fatema Tuz

Ahmed Abdullah Akhtar

Etiologies and antibiotic resistance patterns of acute bloodstream infections by gram-negative bacterial isolates in a tertiary care hospital, Sirajganj, Bangladesh

三级护理医院中由革兰氏阴性菌分离株引起的急性血流感染的病因和抗生素耐药模式，孟加拉国，锡拉杰甘杰

To understand the responsive nature to excess water, a pot experiment was conducted at different growth stages of sesame (Sesamum indicum L. cv. BARI Til-4). The waterlogging stress at each stage was set to three durations, viz. 2, 4, and 6 days. Twelve different treatment combinations were replicated three times and arranged in a completely randomized design. Different morpho-physiological and yield parameters were measured after the completion of the longest stress duration (6 days). The data revealed that sesame is vulnerable to excess water conditions, and the sensitivity is positively correlated with the stress duration. Plant biomass, leaf area, SPAD value, and the yield attributes recorded are observed to be declined with the increment of stress duration. Another important finding is that among the three growth stages of sesame, the reproductive stage is the most sensitive stage, which hardly withstands waterlogging. the stress at the vegetative stage affect yield parameters minimally. J. Bangladesh Acad. Sci. 46(2); 165-173: December 2022

Taufika Islam Anee

Parimal Kanti Biswas

Mirza Hasanuzzaman

Changes in morpho-physiological and yield attributes of Sesamum indicum under waterlogging at different growth stages

不同生长阶段淹水对芝麻形态生理及产量性状变化的影响

This paper proposes a new version of the Reve’s puzzle, allowing at most one violation of the “divine rule”. Letting S(n) be the minimum number of moves required to solve the problem with n(³ 1) discs, an scheme is given to find the dynamic programming equation satisfied by S(n). A closed- form expression of S(n) is derived. J. Bangladesh Acad. Sci. 46(2); 213-217 December 2022

Abdullah Al Kafi Majumdar

The Reve’s Puzzle with single relaxation of the Divine rule

神谕规则单次松弛下的雷维谜题

Gemifloxacin mesylate is a synthetic fluoroquinolone derived antimicrobial agent. Two metal complexes of gemifloxacin mesylate were synthesized viz. gemifloxacin-Fe and gemifloxacin-Zn. The formed complexes were characterized by using TLC, TGA and FT-IR spectra analyses. The formed complexes were then evaluated for antimicrobial activity. The newly formed two complexes were assessed against nine bacterial and one fungal strain, where gemifloxacin (30 µg/disc) was used as a reference standard. The new complexes showed better activity than the standard reference drug against Klebsiella pneumoniae among nine bacterial strains. But two bacterial species, Acinetobacter lwoffii and Enterococcus faecium, and the fungal strain Candida albicans showed complete resistance to the newly synthesized complexes and the reference standard. The drug protein interaction with the Bovine Serum Albumin (BSA) was also studied. The interaction mechanism was explored, suggesting that gemifloxacin and its Zn (II) complex interact with BSA via a static process while the Fe (II) complex interacts via a dynamic process and the lower Ksv value also indicated that drug -BSA complexes were formed in ground-state. J. Bangladesh Acad. Sci. 46(2); 203-211: December 2022

Fahima Aktar

Md Jamal Hossain

Md Zakir Sultan

Mohammad A Rashid

Iron (II) and Zinc (II) complexes of gemifloxacin mesylate: synthesis, characterization, serum binding profiling, and evaluation of antimicrobial activity

甲磺酸吉米沙星的铁(II)和锌(II)配合物：合成、表征、血清结合谱分析及抗菌活性评价

In this document paper, we offer the concepts of some notions of Hausdorff (T2 ) property in intuitionistic fuzzy bitopological spaces. We demonstrate that each of them notion satisfies good extension property. We also establish that these notions satisfy hereditary properties. We observe that all the concepts of intuitionistic fuzzy Hausdorff bitopological spaces are preserved under one-one, onto, fuzzy mappings. J. Bangladesh Acad. Sci. 48(1); 51-59: June 2024

Shahjahan Miah Saikh

Homayra Kabir

Study on intutionistic fuzzy Hausdorff ( T2) bitopological spaces: theoretical insights

直觉模糊豪斯多夫（T2）双拓扑空间研究：理论洞察

Two medicinal plants, O. corniculata and O. triangularis, were investigated cytogenetically for proper characterization. Both plants had Complex Chromocenter interphase nuclei and Continuous prophase chromosomes. O. corniculata was discovered to have 2n=48 chromosomes and 2n=30 in O. triangularis. The chromosomal length range was 0.82±0.02-1.61±0.02 in O. corniculata and 1.02±0.02- 2.52±0.03 in O. triangularis. The total length of the 2n chromosome complement was 53.52±1.19 and 46.76±0.41 for O. corniculate and O. triangular, respectively. The two species differed in centromeric formulas, such as 48m for O. corniculata and 28m+2sm for O. triangularis. In their karyotype, no steady decrease in chromosomal length was seen. These characteristics showed that O. corniculata and O. triangularis could be considered primitive species. Therefore, compiling the cytogenetic features will be helpful to ensure the genuine identification and characterization of the two medicinally important Oxalis species. J. Bangladesh Acad. Sci. 48(1); 135-140: June 2024

Ashma Ahmed Warasy

Chromosomal characterization of two medicinal plants from Bangladesh

孟加拉国两种药用植物的染色体特征

In this paper, we aim to investigate separation axioms in intuitionistic topological spaces. After presenting some characterizations of separation axioms, we provide interrelationships among those and their non-implications in counterexamples. Furthermore, we show that our notions satisfy hereditary and topological properties. Moreover, we establish that some of these notions satisfy productive and projective properties. 2000 Mathematics Subject Classification. 54A99. J. Bangladesh Acad. Sci. 48(1); 35-43: June 2024

Rajandra Chadra Bhowmik

Md Sahadat Hossain

T_0 Separation Axioms in Intuitionistic Topological Spaces

直觉拓扑空间中的T_0分离公理

We have studied the structural and magnetic properties of Zn­1-xFexTe thin films grown under Te-rich flux condition with almost same Fe composition, x = 1.3%, on both undoped and nitrogen (N) acceptor doped ZnTe buffer layer by molecular beam epitaxy (MBE). Structural analysis by XRD and XAFS reveals that Zn­0.987Fe0.013Te films are mainly composed of pure diluted phase with substitutional Fe atoms on the Zn-site in the zinc-blende (ZB) ZnTe in both cases. However, the magnetization measurement using SQUID shows distinctly different magnetic properties among these films; a linear dependence of magnetization on magnetic field (M-H), typical of van-Vleck paramagnetic behavior of Zn­0.987Fe0.013Te film grown over undoped ZnTe turns into ordinary paramagnetic behavior with S-shape M-H curve for film grown on N-doped ZnTe buffer layer, [N] ≈ 1020 cm-3 which may reflect the impact of interfacial holes provided by N-acceptors on the valence state of substitutional Fe. J. Bangladesh Acad. Sci. 48(1); 27-34: June 2024

Indrajit Saha

Shinji Kuroda

Effect of p-type doped buffer layer on the structural and magnetic properties of (Zn,Fe)Te dilute magnetic semiconductor

p型掺杂缓冲层对(Zn,Fe)Te稀磁半导体结构和磁性性质的影响

The purification of waste engine oil was conducted utilizing locally available clay in three different forms: raw, acid-treated, and a mixture of clay with activated charcoal. A 72.6% and 70.12% purification efficiency has been achieved when employing raw and acid-treated clay, respectively. However, the purification yield decreased to 64.35% when utilizing a combination of acid-treated clay and activated charcoal. FTIR analysis confirmed the presence of alkanes and alkenes in the purified oil. The NMR and GC-MS analysis identified the presence of linear and branched alkanes and alkenes, as well as substituted-benzene compounds in the purified oil. The density of waste engine oil and the corresponding purified oil was determined to be 0.929 g/mL and 0.825 g/mL, respectively. After purification, the kinematic viscosity decreased from 192 mm2/sec to 70 mm2/sec at 40 °C. The AAS analysis revealed the presence of 13.28 mg/L of lead (Pb) and 91.56 mg/L of chromium (Cr) in the waste engine oil, which significantly decreased to 0.02 mg/L and 0.037 mg/L, respectively, after purification with clay mixed with activated charcoal. J. Bangladesh Acad. Sci. 48(1); 121-134: June 2024

Mohammed Mahmudur Rahman

Moni Akter

Abu Bakar Siddik

Md Waliul Islam

Sadia Afrin

Mirola Afroze

Mala Khan

Md Azizul Hoque

Md Al Mamun

Purification of waste engine oil using raw clay, acid treated clay and clay/activated charcoal

废发动机油的净化：采用原生黏土、酸处理黏土及黏土/活性炭混合物

涉及主题	physical scienceschemical sciencesmedical sciencesbiological sciencesagricultural sciencesengineering sciences
出版信息	出版商: Bangladesh Journals Online (JOL)，出版周期: ，期刊类型: journal，开源期刊: 是
基本数据	创刊年份: 2012，原创研究文献占比: ，自引率:， Gold OA占比:
平均审稿周期	12 weeks

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