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Bio Synthesis of Gold Nanoparticles Using the Aqueous Leaf Extracts of Melia Dubia and its Anti-Oxidant Efficacy 苦楝叶水提物生物合成纳米金及其抗氧化作用
Pub Date : 2023-01-01 DOI: 10.22232/stj.2023.11.01.07
Shanthy P., Vigneswari K
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引用次数: 0
Some Curvature Properties of Kenmostsu Manifolds with Generalised Tanaka-Webster Connection 广义Tanaka-Webster连接下Kenmostsu流形的一些曲率性质
Pub Date : 2023-01-01 DOI: 10.22232/stj.2023.11.01.12
M.Saroja Devi, Bidyabati Th.
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引用次数: 0
Folk Knowledge of Medicinal Plants Used to Combat COVID-19 by Residents of East Jaintia Hills, Meghalaya 梅加拉亚邦东耆那亚山居民对用于对抗COVID-19的药用植物的民间知识
Pub Date : 2023-01-01 DOI: 10.22232/stj.2023.11.01.01
Fedalia Bamon, Lal nundanga
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引用次数: 1
Induced Magnetism in Non-metal Doped CdS Monolayer 非金属掺杂CdS单层的感应磁性
Pub Date : 2021-07-01 DOI: 10.22232/stj.2021.09.02.12
Lalmuan Chhana, R. Tiwari, L. Zuala, Dibya Prakash Rai
The structural, electronic, and magnetic properties of CdS monolayer doped with non-metallic (NM) atoms B, C and N are studied based on ab initio density functional theory calculations within the generalized gradient approximation as revised for solids by Perdew, Burke and Ernzerhof (PBE-sol). The total magnetic moments per supercell of B, C and N-doped CdS monolayer is found to be ~1.0 µB, ~2.0 µB and ~1.0 µB respectively. As the electronegativity of the dopant increases, the local magnetic moment tends to localize and 2p-states of the dopants gradually move towards the valence band maximum of the host CdS. Our study also confirmed that the introduction of impurity atom by substitution of S atom results in half-metallic magnetism. Our investigation concludes that doping of NM element is an efficient way of altering the magnetic and electronic properties in CdS monolayer.
本文利用Perdew、Burke和Ernzerhof (PBE-sol)对固体修正的广义梯度近似密度泛函理论从头算,研究了掺杂非金属原子B、C和N的CdS单层的结构、电子和磁性能。结果表明,掺杂B、C和n的CdS单层单体单体的总磁矩分别为~1.0µB、~2.0µB和~1.0µB。随着掺杂物电负性的增加,掺杂物的局部磁矩趋于局域化,掺杂物的2p态逐渐向基体cd的价带最大值移动。我们的研究还证实了通过取代S原子引入杂质原子可以产生半金属磁性。我们的研究表明,纳米元素的掺杂是改变CdS单层磁性和电子性能的有效方法。
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引用次数: 0
Potential Application of Indigenous Microorganism Derived Biosorbent in the Efficient Removal of Congo Red from Aqueous Solution 本土微生物衍生生物吸附剂在高效去除刚果红中的潜在应用
Pub Date : 2021-07-01 DOI: 10.22232/stj.2021.09.02.06
Lalmalsawm dawngliani, Gospel Lallawmzuali, Samuel Lallianrawna, T. liana, K. Vanlaldinpuia, C. Lalhriatpuia
IMO compost was obtained using Indigenous Microorganisms (IMO) as inoculant through anaerobic fermentation process from kitchen waste biomass. The Physico-chemical analysis of the solid was obtained by taking pH, MC, OM, OC, N, K and P content. The biosorbent material was further characterized by SEM, IR and BET analytical techniques. Various physico-chemical parametric studies viz. effect of pH, initial dye concentration and background electrolyte concentrations are performed in the removal of Congo red (CR) dye using the IMO compost. The lower pH condition pH < 6.0 favoured the removal of Congo red and the percent removal was decreased with increase in the CR concentration. The removal of Congo red followed the pseudo-second order rate kinetics and the equilibrium state sorption data was reasonably fitted well to the Freundlich adsorption isotherm. In addition, the minimal effect of background electrolyte concentrations (0.0001 to 0.1 mol/L NaNO3) in the removal of CR inferred a specific sorption of Congo red forming ‘inner sphere’ complexes at the surface of the biosorbent.
以厨余生物质为原料,以原生微生物(IMO)为孕育剂,通过厌氧发酵工艺制备IMO堆肥。通过测定固体的pH、MC、OM、OC、N、K、P含量,得到固体的理化分析结果。利用扫描电镜、红外光谱和BET分析技术对生物吸附材料进行了表征。在使用IMO堆肥去除刚果红(CR)染料时,进行了各种物理化学参数研究,即pH值、初始染料浓度和背景电解质浓度的影响。较低的pH条件下,pH < 6.0有利于刚果红的去除率,去除率随CR浓度的增加而降低。刚果红的去除符合准二级速率动力学,平衡态吸附数据符合Freundlich吸附等温线。此外,背景电解质浓度(0.0001至0.1 mol/L NaNO3)对CR去除的影响最小,这表明在生物吸附剂表面形成“内球”复合物的刚果红特异性吸附。
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引用次数: 0
Arbuscular Mycorrhizal Colonization Status in Selected Alien Invasive Plants of Asteraceae 菊科外来入侵植物丛枝菌根定殖状况
Pub Date : 2021-07-01 DOI: 10.22232/stj.2021.09.02.10
M. C. F. Vanlalmuana, Lalmuan puia, K. Chakraborty, R. Lalfakzuala
Invasive alien plants tend to grow much faster than non-invasive plants. The colonization by AM fungi is confirmed by the presence of mycorrhizal structures in the roots of invasive plants. The pattern of hyphae and arbuscules denotes Arum and Paris type of AM fungal morphology. The most common and abundant invasive plants from Asteraceae family were selected for the study. Ageratum conyzoides, Mikania micrantha, Ageratum haustonianum and Bidens Pilosa were selected and eventually showed that they have a high percentage of mycorrhizal colonization. Arum type of morphology is found in three of the plant species and Paris type of morphology is found in one of the species. The extent of AM fungal colonization is fairly high ranging from 60% to 90% among the studied plants. The percentage of arbuscular colonization is highest in Bidens pilosa and the percentage of vesicle and hyphal colonization is highest in Ageratum conyzoides.
外来入侵植物往往比非入侵植物生长得快得多。AM真菌的定植通过入侵植物根部菌根结构的存在得到证实。菌丝和丛枝的形态为Arum型和Paris型。选取了菊科中最常见、最丰富的入侵植物作为研究对象。结果表明,这些品种具有较高的菌根定植率。在三种植物中发现了Arum型形态,在一种植物中发现了Paris型形态。AM真菌在研究植物中的定殖率较高,为60% ~ 90%。丛枝定殖率以毛拜登最高,囊泡定殖率和菌丝定殖率以合子柱最高。
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引用次数: 0
QoS–Aware Web Service Composition using Weight Improved Particle Swarm Optimization 基于权重改进粒子群优化的qos感知Web服务组合
Pub Date : 2021-07-01 DOI: 10.22232/stj.2021.09.02.07
Laishram Jenny Chanu, Arnab Paul
Lots of Web Services are available which differ in their QoS values but can perform a similar task. Discovery mechanism selects the best Web Service according to their QoS values and functional attributes. Cases arise, where the discovery mechanism fails, as a user’s complex query cannot be satisfied by a single Web Service. This can be solved by Web Service composition where multiple Web Services are combined to give a composite Web Service which meet user’s complex query. Our work is mainly focused on composition of Web Services that efficiently meets the user’s query. Different algorithms have been discussed and used by different researchers in this field. One of the most blooming topics is the use of evolutionary algorithms in optimization problems. In our work, we have chosen Particle Swarm Optimization Algorithm approach to discover the best efficient composition. Then, Weight Improved Particle Swarm Optimization Algorithm is used to improve the results which were found to be quite satisfying and efficient.
有许多可用的Web服务,它们的QoS值不同,但可以执行类似的任务。发现机制根据Web服务的QoS值和功能属性选择最佳的Web服务。由于单个Web服务无法满足用户的复杂查询,因此会出现发现机制失败的情况。这可以通过Web服务组合来解决,其中将多个Web服务组合在一起以提供满足用户复杂查询的复合Web服务。我们的工作主要集中在有效地满足用户查询的Web服务组合上。不同的算法已经被不同的研究者讨论和使用。最热门的话题之一是在优化问题中使用进化算法。在我们的工作中,我们选择了粒子群优化算法来发现最有效的组合。然后,利用加权改进粒子群算法对算法进行改进,得到了较好的优化结果。
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引用次数: 0
Rockfall Analysis of State Highway along the Southern Vicinity of Aizawl, Mizoram 米佐拉姆邦Aizawl南部地区国道岩崩分析
Pub Date : 2021-07-01 DOI: 10.22232/stj.2021.09.02.13
Zairem mawii, H. Lalhlimpuia, Lalhming Sangi, V. Vanthangliana, Laldin puia, Shivam Kumar
Slope failure in the form of rockfall is a common phenomenon that occur in the hilly ranges of Himalayas. Mizoram, being a part of it experiences a high rate of rockfall throughout the year especially during the monsoon season. This paper focus on frequent rock fall along the State highway between Aizawl to Lunglei via Thenzawl at Midumkham, Sumsuih village. Damage of passenger vehicles, public goods carrier trucks, private vehicles and road blocks are the common phenomenon due to various forms of landslide within the study area. The death of a couple on 14th October 2016 due to rockfall within the study area captivate attention of government as well as the local about the condition of the area. Thus, detailed study of the area becomes mandatory so as to reduce rockfall and to educate the government and locals about the actual condition of the area. Field reconnaissance has been carried out to collect joint data for kinematic analysis. The behaviour of rockfall was determined by kinematic analysis using Rocscience software Dips 6.0, the stereograph shows that toppling, planar and wedge type are the potential modes of failures. The rock beddings are classified based on RMR (Rock Mass Rating) and SMR (Slope Mass Rating). About 90% of the selected site shows that low RMR as well as SMR value. The RMR values of the rock exposed in the study area indicated a very poor quality of rock mass. The average stand up time obtained 30 min for 1m span suggest high rate of erosion of rocks in the area. The rock slopes represent Class V of Romana classification, considered as very bad rock mass and completely unstable. The low value of rebound number and strength of the rock along with presence of numerous joints determined the high vulnerability of the study area
以落石形式出现的边坡破坏是发生在喜马拉雅山丘陵地区的一种常见现象。作为它的一部分,米佐拉姆邦全年都经历着高比率的岩崩,尤其是在季风季节。本文的重点是在Sumsuih村Midumkham的Aizawl到Lunglei之间的国道上,通过Thenzawl频繁的岩石坠落。在研究区内,由于各种形式的滑坡,客运车辆、公共物品运输车、私家车和路障的损坏是常见的现象。2016年10月14日,一对夫妇因研究区域内的岩崩死亡,引起了政府和当地对该地区状况的关注。因此,必须对该地区进行详细研究,以减少岩崩,并向政府和当地人介绍该地区的实际情况。进行了实地侦察,以收集关节数据进行运动学分析。利用Rocscience软件Dips 6.0对岩崩行为进行运动学分析,立体图显示倾倒、平面和楔型是潜在的破坏模式。根据岩体质量等级(RMR)和边坡质量等级(SMR)对岩石层理进行分类。约90%的站点显示低RMR和低SMR值。研究区暴露岩石的RMR值表明岩体质量很差。平均站立时间为30分钟,跨度为1m,表明该地区岩石侵蚀率高。岩质边坡代表Romana分类的V类,被认为是非常糟糕的岩体,完全不稳定。岩石的回弹数和强度较低,且节理较多,决定了研究区脆弱程度高
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引用次数: 2
Monitoring of PM10 Concentration and Evaluation of its Effect on Respiratory Diseases in Aizawl City, Mizoram 米佐拉姆邦艾扎尔市PM10浓度监测及其对呼吸系统疾病影响评价
Pub Date : 2021-07-01 DOI: 10.22232/stj.2021.09.02.09
Davy Lalruatliana, Lalnun Tluanga, S. T. Lalzarzovi
Particulate matter (PM), a primary component of air pollution has been implicated in various respiratory and cardiovascular diseases and was found to be the 13th leading cause of mortality worldwide by the World Health Organisation. The concentration of PM10 (Coarse particulate matters with aerodynamic diameter between 2.5–10 μm ) was assessed for Aizawl City, Mizoram for a period of two years from June 2014–May 2016. The annual mean concentration of PM10 was found to fall within the permissible limit of the National Ambient Air Quality Standard and was highest in Khatla station (71.67 µg/m3) followed by Bawngkawn station (39.75 µg/m3) and Laipuitlang station (33.25 µg/m3) and the lowest annual mean concentration was seen in Mizoram University station (0.85 µg/m3). Seasonal variations have been observed in the mean concentration of PM10 with the highest concentration in winter season (51.3µg/m3±28.27)and the lowest in monsoon season (22.58 µg/m3 ±2.37). Despite the low concentration of PM10, a strong association was found between PM10 exposure and three types of respiratory diseases namely Corrosion of respiratory tract (CORT), chronic obstructive pulmonary disease (COPD) and vasomotor rhinitis (VR).
颗粒物(PM)是空气污染的主要组成部分,与各种呼吸系统和心血管疾病有关,世界卫生组织发现,颗粒物是全球第13大死亡原因。2014年6月至2016年5月,对米佐拉姆邦Aizawl市进行了为期两年的PM10(空气动力学直径在2.5 ~ 10 μm之间的粗颗粒物)浓度评估。PM10的年平均浓度均在国家环境空气质量标准允许范围内,其中喀喇站最高(71.67µg/m3),其次是巴旺关站(39.75µg/m3)和莱普特朗站(33.25µg/m3),米佐拉姆大学站最低(0.85µg/m3)。PM10平均浓度存在季节变化,冬季最高(51.3µg/m3±28.27),季风季节最低(22.58µg/m3±2.37)。尽管PM10浓度较低,但PM10暴露与呼吸道腐蚀(CORT)、慢性阻塞性肺疾病(COPD)和血管运动性鼻炎(VR)三种呼吸系统疾病之间存在很强的相关性。
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引用次数: 0
Non-Linear Optical Properties and Global Reactivity Descriptors by ab initio Hartree-Fock (H.F.) Calculations of Simple Coumarins 从头算Hartree-Fock (H.F.)的非线性光学性质和全局反应性描述符简单香豆素的计算
Pub Date : 2021-07-01 DOI: 10.22232/stj.2021.09.02.01
P. Sumalatha, N. Muralikrishna, K. V. Padmavathi, M. Subbarao
In this present analysis, the measurement of optimized molecular structure and molecular hyperpolarizability (βtotal) of simple coumarin molecules were investigated using the HF method at 6-311G basis set level Gaussian09W. The measured nonlinear optical parameters (NLO); polarizability (α), the anisotropy of the polarizability (Δα), and first-order molecular hyperpolarizability (βtotal) of the studied coumarins indicate promising optical properties. The energy difference between HOMO and LUMO helped determine the molecular descriptors; global hardness (η), softness (σ) electronegativity (χ) Chemical potential (μ), and electrophilicity index (ω) in gas and different solvents. The molecular hyperpolarizability (βtotal) and descriptors that have been calculated in the solvent medium were taken into consideration through the Polarizable Continuum Model (PCM), This study shows the high static hyperpolarizability exhibited by HNR, FXT, and CNT and offers the potential the materials may have for NLO devices. The molecular descriptors, hardness, and chemical potential values are high for CNT and UCAcompared to other studied coumarins. This suggested that CNT and CA have the most significant chemical potential resistance to change the number of electrons among the other molecules.
本研究在6-311G基集能级Gaussian09W下,用HF法测定简单香豆素分子的优化分子结构和分子超极化率(β总)。测量的非线性光学参数(NLO);所研究的香豆素的极化率(α)、极化率的各向异性(Δα)和一阶分子超极化率(β总)表明其具有良好的光学性质。HOMO和LUMO之间的能量差有助于确定分子描述符;总体硬度(η)、柔软度(σ)、电负性(χ)、化学势(μ)、亲电性指数(ω)。通过可极化连续体模型(Polarizable Continuum Model, PCM)计算了溶剂介质中分子的超极化率(βtotal)和描述子,该研究显示了HNR、FXT和CNT所表现出的高静态超极化率,并提供了材料可能具有NLO器件的潜力。与其他研究的香豆素相比,碳纳米管和uca的分子描述符、硬度和化学势值都很高。这表明碳纳米管和CA在其他分子中具有最显著的化学势抵抗改变电子数量的能力。
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引用次数: 0
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Silpakorn University Science and Technology Journal
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