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A modified gas flow model in the near wellbore region below dew point pressure

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Petroleum 2021年第3期7卷 294-302页

作者： Abed Inan Chowdhury md Mostafijul karim Department of Petroleum and Mining Engineering Chittagong University of Engineering&TechnologyChittagongBangladesh

When pressure in gas reservoirs fall below the dew point,condensate banking occurs around the wellbore which alters the fluid flow *** state of the knowledge on this flow behavior is yet not fully-developed;which leads to severe problems in *** this study,the Al-Hussainy,Ramey,and Crawford Solution Technique has been modified to accurately resemble the real gas flow behavior for this ***,a primary investigation was conducted to observe the severity of the problem in three condensate banked *** this study involved Constant Composition Expansion tests for determining the dew point,Prode Properties software for modeling the reservoir fluid properties,Flowing Material Balance(or Dynamic P/Z Material Balance)for identifying the pressure distribution of the selected *** real field data along with the determined(analytical,computational,and experimental)data were incorporated to check the validity of the *** modification proposes a Dimensionless Correction Factor(CD)for any condensate banked reservoir and identifies parameters such as the Perforation Factor(Pf)and Heterogeneity Factor(n).It is found that the Modified Al-Hussainy,Ramey,and Crawford Solution Technique successfully models the actual flow characteristics of the stated condition.

关键词： Condensate banking Effective permeability Gas flow modeling Model fitting

Exploration of Distinct Physiological and Biochemical Alterations in Chickpea (Cicer arietinum L.) under Varying Organic Materials, Drought and Proline Application

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Phyton-International Journal of Experimental Botany 2022年第12期91卷 2775-2789页

作者： Uttam Kumer Sarker a.n.md.an.mul karim F.M.Jamil Uddin Ahmed Khairul Hasan najrul Islam md.Romij Uddin md.Alamgir Hossain Sabry Hassan Mohamed M.Hassan Mahmoud F.K.Soliman Department of Agronomy Bangladesh Agricultural UniversityMymensingh2202Bangladesh Department of Crop Botany Bangladesh Agricultural UniversityMymensingh2202Bangladesh Department of Biology College of ScienceTaif UniversityTaif21944Saudi Arabia nature Conservation Sector Egyptian Environmental Affairs Agency(EEAA)Cairo11435Egypt

Chickpea yield is decreasing day by day due to drought stress,which could be an immense risk for future food security in developing *** practices could be the most excellent approach to diminish loss due to this abiotic *** current research work was designed to explore the tolerance reaction of chickpea genotypes against management practices,through morphological and biochemical parameters and evaluate yield performance across drought prone location of *** genotypes BD-6048,BD-6045,BD-6090,BD-6092 and eight management practices,e.g.,severe water stress(SWS),i.e.,without irrigation,10 cm thick mulching with rice straw(MRS),10 cm thick mulching with water hyacinth(MWH),organic amendment through compost(OAC)@3 t ha−1,organic amendment through cow dung@5 t ha−1(OACD),organic amendment through poultry manure@2 t ha−1(OAPM),inorganic amendment through proline application(IAPA)as foliar spray and 16 h hydro-priming(HP).The study revealed that the genotypes BD-6048 showed excellent performance because of the highest chlorophyll,carotenoids,phosphorus,potassium,proline and protein *** highest pod number plant−1 also increased seed yield in *** management practices,IAPA increased relative water content,carotenoids,leaf phosphorus and potassium compared to other management practices and severe water ***,BD-6084 was selected as best genotype because of a significant increase in chlorophyll a and b,carotenoids,and relative water content with *** top performing genotypes can be used for releasing variety and cultivated for sustainable production in drought prone area of Bangladesh.

关键词： Hydro-priming grain yield organic amendments photosynthetic activity

Dicyclopentamethylenethiuram Disulfide as Precursor of Mononuclear Complexes: Oxidative Cleavage of Metal-Metal Bond in [CpMo(CO)3]2and Molecular Structure of cis-[CpMo(CO)2{S2C-n(CH2)5}]

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Crystal Structure Theory and Applications 2017年第4期6卷 67-72页

作者： md. Manzurul karim Shafikul Islam md. RafikulIslam Mohammad R. karim Tasneem A. Siddiquee Department of Chemistry Jahangirnagar University Savar Bangladesh Department of Chemistry Morning Glory School and College Savar Bangladesh Department of Chemistry Barisal Cadet College Barisal Bangladesh Department of Chemistry Tennessee State University Nashville TN USA

The reaction of [CpMo(CO)3]2 with dicyclopentamethylenethiuram disulfide in refluxing xylene resulted a novel mono nuclear complex, cis-[(CpMo(CO)2{S2C-n(CH2)5}] as red crystals in moderate yield. The compound was formed by the oxidative cleavage of metal-metal bond in [CpMo(CO)3]2 together with a reductive sulfur-sulfur bond scission in the ligand.

关键词： Dicyclopentamethylenethiuram Disulfide (Dcpmtd) Oxidation number Oxida-tive Cleavage Coordination number Mononuclear Complex X-Ray Crystal Structure

Oxidase Enzyme Activities and Their Correlations with Antioxidative Stress Biomarkers in Patients with Acute Coronary Syndrome in Bangladesh

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World Journal of Cardiovascular Diseases 2020年第4期10卷 163-177页

作者： nourin Ferdausi md. Eahsanul karim Anik nabila nawar Binti Laila n. Islam Department of Biochemistry and Molecular Biology University of Dhaka Dhaka Bangladesh

Acute coronary syndrome (ACS) is a range of conditions associated with decreased blood flow in the coronary arteries resulting from sudden rupture of atherosclerotic plaques. Several studies have found that oxidative stress is involved in the initiation and progression of atherosclerosis. The role of oxidase enzymes and antioxidative stress biomarkers in these processes needs further attention. In this study, a total of 120 participants were enrolled which comprised 60 ACS patients and 60 control subjects. The major oxidase enzyme, xanthine oxidase, which plays a pivotal role in the generation of reactive oxygen species (ROS), showed significantly higher activities in both serum (158.03 ± 43.30 mU/mL) and red blood cells (RBC) lysate (309.07 ± 75.73 mU/mL) of the ACS patients compared to controls, 48.51 ± 13.41 mU/mL and 184.10 ± 70.14 mU/mL, respectively. The nicotinamide adenine dinucleotide phosphate (nADPH) oxidase and myeloperoxidase, both of which are major contributors to ROS production, showed significantly higher activities in patients (14.13 ± 3.38 U/L and 10.9 ± 3.3 U/mg) than in controls, 6.90 ± 1.94 U/L and 5.9 ± 1.5 U/mg, respectively. Ceruloplasmin, an emerging biomarker of inflammation, showed significantly higher activity in patients (83.8 ± 26.2 U/L) compared to controls, 70.0 ± 18.9 U/L. The antioxidant enzyme glutathione reductase showed significantly lower activity in patients than controls, 60.7 ± 47.8 U/mL/min and 85.2 ± 49.5 U/mL/min, respectively. Evaluation of cardioprotective biomarkers nitric oxide and high-density lipoprotein-cholesterol (HDL-C) showed significantly lower values in patients. Correlation analyses between these parameters further corroborated increased oxidative stress in patients. These findings suggest that excessive productions of ROS by the oxidase enzymes cause an imbalance between oxidants and antioxidants in favor of oxidants leading to increased oxidative stress in patients with ACS.

关键词： ACS Xanthine Oxidase nADPH Oxidase Ceruloplasmin Glutathione Reductase

Synthesis and Characterization of 2,2’-Bipyridyl-5,5’-Dialdehyde Schiff Bases from O,S,n and F-Containing Amines

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International Journal of Organic Chemistry 2015年第1期5卷 29-36页

作者： md Rejaul Hoq Mohammad R. karim md. Arifuzzaman Aminul H. Mirza Department of Chemistry Tennessee State University Nashville TN USA Department of Chemistry Iowa State University Ames IA USA Chemistry Faculty of Science Universiti Brunei Darussalam Jalan Tungku Link Brunei Darussalam

Design and synthesis of organic chelating agents containing nitrogen and sulfur as donor atoms and their metal complexes is an interesting field of research for their different types of activities. The bi-dentate n,n chelating agent such as 2,2-Bipyridal has been playing a vital role in synthetic and medicinal chemistry. 2,2-Bipyridal has been used to prepare many mixed-ligand complexes. Different ligand complexes prepared from 2,2-Bipyridyl are used in different areas such as molecular catalysis, solar energy conversion, calorimetric analysis, herbicides, molecular recognition, self-assembly, antineoplastic agents, and nucleic acid probes. Another important property of these types of compounds is the triplet state photosensitizing character of bipyridyl nucleus, which is shown in metal complexes. It is also found that compounds containing O,S,n atoms have received considerable attention because of their pharmacological studies like anticancer, antibacterial, and antitumour activities. Therefore, it has been decided to synthesize Schiff bases derived from 2,2’- bipyridyl-5,5’-dicarbaldehyde compounds with O,S,n and F-containing amines and study their antibacterial properties. Several new Schiff bases have been synthesized and fully characterized by spectral data. This paper presents the synthesis and characterization of newly designed Schiff bases.

关键词： 2 2’-Bipyridyl Schiff Base O S n-Containing Amines 5 5’-Dicarbaldehyde Bidentate

new Schiff Bases from 6,6’-Diformyl-2,2’-Bipyridyl with Amines Containing O, S, n and F: Synthesis and Characterization

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International Journal of Organic Chemistry 2015年第4期5卷 264-270页

作者： md. Razzak Mohammad R. karim md. Rejaul Hoq Aminul H. Mirza Department of Chemistry Tennessee State University Nashville USA Department of Chemistry Faculty of Science Universiti Brunei Darussalam Bandar Seri Begawan Brunei Darussalam

Eight novel Schiff Bases, from 6,6′-diformyl-2,2′-bipyridyl (1a, 43%)with O, n, S and F containing amines: Thiosemicarbazide (2a, 70%), 4-Ethyl-3-thiosemicabazide (2b, 75%), 4,4-Dimethyl-3-thio-semicarbazide (2c, 75%), S-benzyldithiocarbazide, SBDTC (2d, 80%), (Trifluromethyl) phenylhy-drazine (2e, 80%), 4-Phenyl-3-thiosemcarbazide (2f, 80%), Thiocarbazide (2g, 70%), 2-Amino-thiophenol (2h, 65%), have been synthesized. The conventional method of synthesis of the Schiff bases involves refluxing the reaction mixture containing the diformyls and amines for 1 hour. The solid products that had formed were filtered off using suction filtration. In few reactions, 2 - 3 drops of conc. sulfuric acid were used to obtain high yield. The structures of all eight novel synthesized compounds have fully been characterized by spectroscopic (IR, nMR, MS) methods.

关键词： 2 2’-Bipyridyl Schiff Base O n S and F Containing Amines 6 6’-Diformyl

Geomorphological, Geological and Engineering Geological Aspects for Sustainable Urban Planning of Mymensingh City, Bangladesh

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Open Journal of Geology 2018年第7期8卷 737-752页

作者： Salma Akter Reshad md. Ekram Ali Shahtaj karim Mahmuda Khatun Mohammad Feruj Alam Geological Survey of Bangladesh Dhaka Bangladesh Jahangirnagar University Dhaka Bangladesh

Geomorphological, geological and engineering geological information is used as the base data to characterize the subsurface condition and for sustainable urban planning and development of the rapidly expanding Mymensingh city. Extensive field work has been completed to get the realistic scenario, data and samples have been collected from surface and subsurface with auguring and geotechnical boring. The laboratory tests have been performed following standard laboratory procedures. Geomorphologically the area is broadly classified into Older Floodplain or Mymensingh Terrace and Younger Floodplain. These two flood plains are separated by Old Brahmaputra River. Geologically the area is mainly covered by the recent alluvial flood plain deposits which are underlain by the Pleistocene Madhupur clay deposits. The Younger Flood Plain deposit consists of mainly unconsolidated fine to medium sands with some silt and clay whereas the Older Flood Plain deposits are mainly consisting of silty clay and fine to medium sand. Moderately compacted sediments of older flood plain deposit are suitable for urban development. Based on geotechnical characteristics and the n values (blow counts of Spontaneous Penetration Test, SPT) of the subsurface sediments, the study area is classified into four Engineering Geological Units. Unit I indicates loose soil and is suitable for shallow foundation. Unit II is indicating compact soil packing;n value of these two units increase with depth and would be good for heavy foundation. Unit III is suitable for shallow structures. Unit IV, which is composed of mostly clay, silty clay and sand with highly compressive organic clay, is recommended to avoid any heavy construction and could be used as open place, water retaining zone etc. Beside the geological and engineering geological study details hydrology and hydrogeological and a systematic study on seismic hazards are strongly recommended before planning of urban area.

关键词： Geology Engineering Geology Standard Penetration Test (SPT)

南海北部陆架和陆坡区小型底栖动物群落的比较研究

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海洋与湖沼 2020年第3期51卷 555-563页

作者：周红 Saif md Uddin 黄梦娇刘晓收王正茂尹泳桐姜钱钱 Rebeca Montero-Taboada karim md Abdul 中国海洋大学海洋生命学院青岛266003

为了解南海北部陆架与陆坡区小型底栖动物的群落特征,以及影响群落特征的环境因素,2015年6月对南海北部海域(19.3°—21.4°n, 112.4°—115.1°E)7个站位的小型底栖动物及环境因子进行了采样,并对陆架和陆坡区小型底栖动物群落的丰度... 详细信息

为了解南海北部陆架与陆坡区小型底栖动物的群落特征,以及影响群落特征的环境因素,2015年6月对南海北部海域(19.3°—21.4°n, 112.4°—115.1°E)7个站位的小型底栖动物及环境因子进行了采样,并对陆架和陆坡区小型底栖动物群落的丰度、生物量、类群组成和群落结构进行比较。结果表明,在陆架站位,小型底栖动物由13个类群组成,平均丰度为(132±130)ind./10cm^2,平均生物量为(169±79)μgdwt/10cm^2;在陆坡站位由8个类群组成,平均丰度为(33±14)ind./10cm^2,平均生物量为(56±35)μgdwt/10cm^2。单因素方差分析结果表明,陆坡区小型底栖动物的总丰度和总生物量以及线虫和多毛类的丰度均显著低于陆架区,但优势类群的相对丰度组成没有显著不同,海洋线虫占总丰度的83%,其次为多毛类和桡足类,分别占7%和3%。环境因子的主成分分析(Principal ComponentsAnalysis,PCA)将陆架和陆坡站位沿第一主分量轴分开,小型底栖生物丰度和生物量与沉积物叶绿素a和脱镁叶绿酸含量以及底层水温呈最大正相关,与水深呈负相关;聚类(Cluster)和排序(non-metric multidimensional Scaling, mdS),以相似性系数65%将7个站位划分为2组,与按照水深划分的陆架和陆坡组基本吻合;单因素相似性分析(one-way AnOSIM)显示陆架和陆坡区小型底栖动物群落结构差异显著;生物-环境分析(Biota-Environment,BIOEnV)表明影响群落结构的最佳环境因子组合为叶绿素a和底层水温。综上可知,随水深增加的食物减少和底层水温的下降是限制南海北部研究海域小型底栖动物丰度和生物量及影响群落组成和结构的主要因素。

关键词：小型底栖动物群落丰度和生物量组成和结构陆架和陆坡南海北部

Some novel Schiff Bases from Pyruvic Acid with Amines Containing n &S Donor Atoms: Synthesis, Spectral Studies and X-Ray Crystal Structures

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International Journal of Organic Chemistry 2017年第1期7卷 42-56页

作者： Abdul Azim Jambol Malai Haniti Sheikh Abdul Hamid Aminul Huq Mirza md. Shafiqul Islam Mohammad Rezaul karim Chemical Sciences Faculty of Science Universiti Brunei Brunei Darussalam Bandar Seri Begawan Brunei Darussalam Department of Chemistry Tennessee State University Nashville USA

Four Schiff bases, from pyruvic acid (1) with amines containing n and S donor atoms, thiocarbohydrazide (2, 61%), 2-methyl-3-thiosemicarbazide (3, 26%), S-benzyldithiocarbazate (4, 51%) and S-n-octyldithiocarbazate (5, 63%) have been successfully synthesized. The conventional method was used and a series of novel linear and cyclic Schiff bases were obtained with or without catalyst. All the Schiff bases were fully characterized by CHn elemental analysis, FT-IR, 1H & 13C nMR, EI-MS and two of the Schiff bases were further characterized by X-ray crystallographic structure analysis. Compound 2 crystallizes in the triclinic space group P-1 and unit cell dimensions are: a = 4.1777(8), b = 5.9538(11), c = 13.458(3) &ARInG;, α = 92.759(6), β = 90.813(6), γ = 100.040(6)°, R1 = 0.0439. Compound 3 crystallizes in the orthorhombic space group P n a 2(1) and unit cell dimensions are: a = 5.5992(2), b = 11.3962(5), c = 10.6473(5), α = 92.759(6), β = 90.813(6), γ = 100.040(6)°, R1 = 0.0285. Compounds 2 and 3 were obtained as cyclic Schiff bases which are triazine derivatives.

关键词： Pyruvic Acid Schiff Bases Thiocarbohydrazide S-Alkyldithiocarbazates Thiosemicarbazide Triazine n and S Containing Amines