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Investigating the Influence of Precursor Concentration on the Photodegradation of Methylene Blue using Biosynthesized ZnO from Pometia pinnata Leaf Extracts 利用从羽扇豆叶提取物中生物合成的氧化锌研究前体浓度对亚甲蓝光降解的影响
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-12-05 DOI: 10.21123/bsj.2023.9176
A. S. Rini, Y. Rati, Seliana Putri, R. Dewi
The ZnO nanoparticles were synthesized at various precursor concentrations i.e. 0.05, 0.1, and 0.5 M by biosynthesis method based on Pometia pinnata Leaf Extracts. Initial nanoparticle concentration influenced the optical bandgap, shape, and structure of nanoparticles. The photodegradation process was carried out under UV illumination. The efficiency of MB degradation was determined by measuring the decrease in MB concentration and by analyzing the optical absorption at 663 nm recorded by UV-Vis spectroscopy. Results showed that the biosynthesized ZnO nanoparticles exhibited efficient photodegradation of MB, with a maximum degradation rate of 80% after 90 minutes of exposure to UV-C light. The study highlights the potential of Pometia pinnata leaf extracts as a low-cost and eco-friendly alternative for synthesizing ZnO nanoparticles for use in environmental remediation processes
以柚子叶提取物为原料,采用生物合成法在0.05、0.1和0.5 M的不同前体浓度下合成ZnO纳米颗粒。纳米颗粒初始浓度影响了光学带隙、形状和结构。在紫外光照下进行了光降解过程。通过测定MB浓度的下降量和紫外-可见光谱记录的663 nm处的光吸收来确定MB的降解效率。结果表明,生物合成的ZnO纳米粒子对MB具有良好的光降解能力,在UV-C光照射90分钟后,其降解率最高可达80%。该研究强调了柚子叶提取物作为一种低成本、环保的ZnO纳米颗粒合成替代品的潜力,并将其用于环境修复过程
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引用次数: 0
An Observation and Analysis the role of Convolutional Neural Network towards Lung Cancer Prediction 观察和分析卷积神经网络对肺癌预测的作用
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-12-05 DOI: 10.21123/bsj.2023.9029
Suranjana Mitra, A. B. Majumder, Tanusree Saha
Lung cancer is one of the most serious and prevalent diseases, causing many deaths each year. Though CT scan images are mostly used in the diagnosis of cancer, the assessment of scans is an error-prone and time-consuming task. Machine learning and AI-based models can identify and classify types of lung cancer quite accurately, which helps in the early-stage detection of lung cancer that can increase the survival rate. In this paper, Convolutional Neural Network is used to classify Adenocarcinoma, squamous cell carcinoma and normal case CT scan images from the Chest CT Scan Images Dataset using different combinations of hidden layers and parameters in CNN models. The proposed model was trained on 1000 CT Scan Images of cancerous and non-cancerous cells to find the best combination of parameters in CNN to predict lung cancer accurately.  The proposed system recorded the highest accuracy of 92.79%. In addition to that, the paper addresses 192 observations made using the CNN model. 
肺癌是最严重和最普遍的疾病之一,每年造成许多人死亡。虽然CT扫描图像主要用于癌症的诊断,但对扫描结果的评估是一项容易出错且耗时的任务。机器学习和基于人工智能的模型可以非常准确地识别和分类肺癌的类型,这有助于肺癌的早期发现,从而提高生存率。本文利用卷积神经网络对胸部CT扫描图像数据集中的腺癌、鳞状细胞癌和正常病例CT扫描图像进行分类,在CNN模型中使用不同的隐藏层和参数组合。该模型在1000张癌细胞和非癌细胞的CT扫描图像上进行训练,寻找CNN中最佳的参数组合来准确预测肺癌。该系统的最高准确率为92.79%。除此之外,该论文还使用CNN模型进行了192次观察。
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引用次数: 0
Synthesis of Multifunctional Polymers Based on Tert-Butyl Acrylamide/Octyl Acrylate as Lubricant Additives and Adsorbents for Copper Ion from Aqueous Solution 合成基于丙烯酰胺叔丁酯/丙烯酸辛酯的多功能聚合物,作为润滑油添加剂和水溶液中铜离子的吸附剂
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-12-05 DOI: 10.21123/bsj.2023.9095
A. Mohammed, Enaam Fadel Mousa, A. H. Hamed, Mansor Ahmad
Two homopolymeric and three copolymeric additives for base oil were synthesized using octyl acrylate (OA) and tert-butyl acrylamide (TBA) monomers. The two additives named P1 and P2 are the homopolymers of TBA and OA, respectively, whereas copolymeric additives named Co1, Co2, and Co3 were synthesized by varying the ratios of TBA:OA as 1:3, 3:1 and 1:1, respectively. The prepared polymers were characterized by Fourier Transform Infrared (FTIR). Based on the solubility of synthesized polymers in base oil and reactivity ratios of TBA/OA copolymer (0.222, 0.434) calculated by Fineman-Ross method, P2, Co1, Co2 and Co3 were selected to evaluate their performance as pour point depressant (PPD), viscosity improver (VII), and anticorrosion additives in base oil. Additives P2 and Co1 showed the best performance as (PPD) and (VII) whereas Co2 and Co3 revealed the best performance as anticorrosion additives. The flash point of base oil increased as a concentration of polymeric additives increased in the base oil. In addition to study the performance of synthesized polymers as lubricant additives, the capability of polymers for removing CuII from synthetic wastewater was also investigated. Different parameters such as pH of solution, contact time, and CuII concentration were changed in order to study their effect on adsorption capacity of polymers. Generally, polymers with high TBA content such as P1, Co2, and Co3 showed good performance in removing CuII.
以丙烯酸辛酯(OA)和丙烯酰胺叔丁基(TBA)为单体,合成了2种均聚物和3种共聚物基础油添加剂。添加剂P1和P2分别是TBA和OA的均聚物,而共聚添加剂Co1、Co2和Co3分别是在TBA和OA的比例分别为1:3、3:1和1:1时合成的。用傅里叶红外(FTIR)对所制备的聚合物进行了表征。根据合成的聚合物在基础油中的溶解度和通过Fineman-Ross法计算的TBA/OA共聚物的反应性比(0.222,0.434),选择P2、Co1、Co2和Co3作为基础油中的降凝剂(PPD)、增粘剂(VII)和防腐添加剂,评价其在基础油中的性能。添加剂P2和Co1作为(PPD)和(VII)的防腐性能最好,而Co2和Co3作为防腐添加剂的防腐性能最好。随着基础油中聚合物添加剂浓度的增加,基础油闪点增大。除了研究合成的聚合物作为润滑剂添加剂的性能外,还研究了聚合物对合成废水中CuII的去除能力。研究了溶液pH、接触时间、CuII浓度等参数对聚合物吸附能力的影响。一般来说,TBA含量较高的聚合物如P1、Co2和Co3对CuII的去除效果较好。
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引用次数: 0
Synthesis and Antibacterial Evaluation for Some New Schiff-bases Derived from P-aminoacetanilide 由 P-氨基乙酰苯胺衍生的一些新希夫碱的合成与抗菌评价
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-12-05 DOI: 10.21123/bsj.2023.8905
Eman M. Hussain
Derivatives of Schiff-bases possess a great importance in pharmaceutical chemistry. They can be used for synthesizing different types of bioactive compounds. In this paper, derivatives of new Schiff bases have been synthesized from several serial steps. The acid (I) was synthesized from the reaction of dichloroethanoic acid with 2 moles of p-aminoacetanilide. New acid (I) converted to its ester (II) via the reaction of (I) with dimethyl sulphate in the present of anhydrous of sodium carbonate and dry acetone. Acid hydrazide (III) has been synthesized by adding 80% of hydrazine hydrate  to the new ester using ethanol as a solvent. The last step included the preparation of new Schiff-bases (IV-VIII) by the reaction of acid hydrazide with appropriate aromatic aldehydes and using glacial acetic acid as a catalyst. New derivatives were diagnosed by FT-IR, and by mass and 1HNMR spectroscopy (some of them). Derivatives (IV-VIII) were screened for their antibacterial against E. Coli (G-) and staph. aureus (G+). All tested compounds were found to have activity against the two kinds of bacteria.
席夫碱衍生物在药物化学中占有重要地位。它们可用于合成不同类型的生物活性化合物。本文通过一系列步骤合成了新的席夫碱衍生物。以二氯乙醇酸和2mol对氨基乙酰苯胺为原料合成了酸(I)。在无水碳酸钠和干丙酮的存在下,通过(I)与硫酸二甲酯反应,将新酸(I)转化为其酯(II)。以乙醇为溶剂,在新酯中加入80%的水合肼,合成了酸性肼(III)。最后一步以冰醋酸为催化剂,通过酸性肼与合适的芳香醛反应制备新的希夫碱(IV-VIII)。新的衍生物是通过FT-IR,质量和1HNMR光谱(其中一些)诊断出来的。筛选衍生物IV-VIII对大肠杆菌(G-)和葡萄球菌的抑菌作用。葡萄球菌(G +)。所有被测试的化合物都被发现对这两种细菌有活性。
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引用次数: 0
A Novel Water Quality Index for Iraqi Surface Water 伊拉克地表水的新型水质指数
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-12-05 DOI: 10.21123/bsj.2023.9348
Zahraa Z. Aljanabi, A. M. J. Al-Obaidy, Fikrat M. Hassan
The study aims to build a water quality index that fits the Iraqi aquatic systems and reflects the environmental reality of Iraqi water. The developed Iraqi Water Quality Index (IQWQI) includes physical and chemical components. To build the IQWQI, Delphi method was used to communicate with local and global experts in water quality indices for their opinion regarding the best and most important parameter we can use in building the index and the established weight of each parameter. From the data obtained in this study, 70% were used for building the model and 30% for evaluating the model. Multiple scenarios were applied to the model inputs to study the effects of increasing parameters. The model was built 4 by 4 until it reached 17 parameters for 10 sampling times. Obviously, with the increasing number of parameters, the value of the index will change. To minimize the effect of eclipse that arises in WQI and to solve the problem of overlapping quality and pollution, this study has created another index linked with IQWQI, which included both the quality and the degree of pollution. The second index is called the Environmental Risk Index (ERI), where only the variables that exceed the permissible environmental limits were included. Sensitivity Analysis was done to predicate IQWQI and to determine the most influential parameters in the IQWQI score; two types of models were chosen for the run of the sensitivity test, which are the Artificial Neural Network Regression (ANNR) and Backward Linear Regression (BLR). The results of IWOI and ERI for freshwater use during the dry season were very poor water quality with a high degree of risk. While in the wet season, both indices' values ranged from poor water quality to very poor water quality with a high degree of risk.
该研究旨在建立一个适合伊拉克水生系统的水质指数,并反映伊拉克水的环境现实。开发的伊拉克水质指数(IQWQI)包括物理和化学成分。为了构建IQWQI,我们采用德尔菲法与当地和全球的水质指标专家进行交流,征求他们对我们在构建指标时可以使用的最佳和最重要的参数以及每个参数的确定权重的意见。在本研究获得的数据中,70%用于构建模型,30%用于评估模型。模型输入采用了多种情景,研究了增加参数的影响。通过10次采样,4 × 4地建立模型,直至得到17个参数。显然,随着参数数量的增加,索引的值也会发生变化。为了最大限度地减少日蚀对WQI的影响,解决质量和污染的重叠问题,本研究创建了另一个与IQWQI相关联的指标,该指标同时包含质量和污染程度。第二个指数被称为环境风险指数(ERI),其中只包括超过允许的环境限制的变量。通过敏感性分析来预测IQWQI,并确定影响IQWQI评分的最重要参数;选择人工神经网络回归(ANNR)和反向线性回归(BLR)两种模型进行敏感性检验。IWOI和ERI对旱季淡水利用的结果是水质非常差,风险程度很高。而在丰水期,两项指数的值均介于水质差至极差之间,风险程度较高。
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引用次数: 0
Ecofriendly Control for Stored-Product Pest, Oryzaephilus surinamensis (Order: Coleoptera, Family: Silvanidae) 储藏产品害虫苏里南蚕(目:鞘翅目,科:蚕蛾科)的生态友好型防治方法
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-12-05 DOI: 10.21123/bsj.2023.9104
F. Galal
Dates are considered one of the most important foods consumed in Arab countries. Dates are commonly infested with the sawtoothed grain beetle, Oryzaephilus surinamensis. Consequently, the date yield, quantity, and quality (economic value and seed viability) are negatively affected. This study was designed to investigate the effectiveness of air evacuation as eco-friendly and safe control method against adult O. surinamensis. Insects were obtained from the infested date purchased from a private store in sakaka city, Aljouf region, Saudi Arabia. Air evacuation (using a vacuum pump) and food deprivation were applied to O. surinamensis, and insect mortality was observed daily in comparison with the control group (administered both food and air). Application of both air evacuation, and food deprivation, significantly, increased the percentage of daily mortality when compared to control. Percentage accumulative mortality displayed very strong positive correlation with the time course in both cases of air-deprived and food-deprived groups. On the basis of lethal time values, the air evacuation method resulted in a comparable effect of food deprivation. Conclusively, the air-evacuation of the package is a very effective Eco-friendly and safe control method against O. surinamensis.
枣被认为是阿拉伯国家最重要的食物之一。枣子通常被锯齿状谷物甲虫(Oryzaephilus surinamensis)侵染。因此,枣的产量、数量和质量(经济价值和种子活力)都受到负面影响。本研究旨在探讨空气抽吸作为一种环保、安全的防治方法对苏里南稻蛾成虫的有效性。昆虫是从沙特阿拉伯Aljouf地区sakaka市一家私人商店购买的受感染枣中获得的。对苏里南稻蛾进行抽气(使用真空泵)和食物剥夺,与对照组(同时给予食物和空气)相比,每天观察昆虫死亡率。与对照组相比,空气抽吸和食物剥夺都显著提高了日死亡率。在空气剥夺组和食物剥夺组中,累积死亡率百分比与时间进程均表现出非常强的正相关。在致死时间值的基础上,空气抽吸法产生了与食物剥夺相当的效果。综上所述,包装抽气是一种非常有效、环保、安全的防治方法。
{"title":"Ecofriendly Control for Stored-Product Pest, Oryzaephilus surinamensis (Order: Coleoptera, Family: Silvanidae)","authors":"F. Galal","doi":"10.21123/bsj.2023.9104","DOIUrl":"https://doi.org/10.21123/bsj.2023.9104","url":null,"abstract":"Dates are considered one of the most important foods consumed in Arab countries. Dates are commonly infested with the sawtoothed grain beetle, Oryzaephilus surinamensis. Consequently, the date yield, quantity, and quality (economic value and seed viability) are negatively affected. This study was designed to investigate the effectiveness of air evacuation as eco-friendly and safe control method against adult O. surinamensis. Insects were obtained from the infested date purchased from a private store in sakaka city, Aljouf region, Saudi Arabia. Air evacuation (using a vacuum pump) and food deprivation were applied to O. surinamensis, and insect mortality was observed daily in comparison with the control group (administered both food and air). Application of both air evacuation, and food deprivation, significantly, increased the percentage of daily mortality when compared to control. Percentage accumulative mortality displayed very strong positive correlation with the time course in both cases of air-deprived and food-deprived groups. On the basis of lethal time values, the air evacuation method resulted in a comparable effect of food deprivation. Conclusively, the air-evacuation of the package is a very effective Eco-friendly and safe control method against O. surinamensis.","PeriodicalId":8687,"journal":{"name":"Baghdad Science Journal","volume":"86 24","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138600370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Purification and characterization of L-asparaginase produced from Bacillus sp. 从芽孢杆菌(Bacillus sp.
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-12-05 DOI: 10.21123/bsj.2023.9231
Sahar I. H., Zaid A. H., Milad A.
The objective of this study was to isolate and identify the asparaginase-producing bacteria, then purify and characterize the enzyme in order to investigate their properties in the future. Fifteen local bacterial isolates were isolated from various sites in the city of Baghdad, identified by conventional morphological and biochemical procedures, and confirmed using vitek 2 methods, and submitted to primary screening processes for asparaginase production. For secondary screening, eight isolates with the greatest yellow zone ability on a specific solid medium were chosen. Bacillus sp. was reported to have the highest enzyme production (7.5 U/mg proteins). After 24 hours of incubation, submerged fermentation yielded optimal conditions for the production of L-asparaginase (L-ASNase) by the chosen isolate, with medium (2) serving as the optimal medium for production and fructose serving as the optimal source of carbon. In pH 6 at 40°C, Sephadex G-150 gel filtration chromatography was used to purify the enzyme. The final purification folds were increased by 2.5 times, resulting in an enzyme yield of 93.7%. It also showed the highest purified enzyme activity and stability was at 37°C. Also it revealed the highest activity and stability at pH 7.0 and pH 8.0 respectively. Enzyme lost activity when exposed to several metallic ions at concentrations of 1, 5, and 10 mM.
本研究的目的是分离和鉴定产生天冬酰胺酶的细菌,并对酶进行纯化和表征,为今后研究其性质奠定基础。从巴格达市的不同地点分离出15株当地分离细菌,通过常规形态学和生化方法进行鉴定,并使用vitek 2方法进行确认,并提交给天冬酰胺酶生产的初步筛选过程。选择8株在特定固体培养基上黄带能力最强的菌株进行二次筛选。据报道,芽孢杆菌的酶产量最高(7.5 U/mg蛋白质)。培养24小时后,所选分离物通过深层发酵获得l -天冬酰胺酶(L-ASNase)的最佳生产条件,培养基(2)为最佳生产培养基,果糖为最佳碳源。在pH为6,温度为40°C的条件下,采用Sephadex G-150凝胶过滤层析纯化酶。最终纯化折叠数提高2.5倍,产酶率达93.7%。纯化后的酶活性和稳定性在37℃时最高。在pH 7.0和pH 8.0时活性和稳定性最高。当暴露于浓度为1、5和10毫米的几种金属离子时,酶失去活性。
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引用次数: 0
Solvability of the Quaternary Continuous Classical Boundary Optimal Control Dominated by Quaternary Parabolic System 四元抛物系统主导的四元连续经典边界最优控制的可解性
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-11-19 DOI: 10.21123/bsj.2023.8690
J. A. Al-Hawasy, Fetan J. Naji
The purpose of this paper is to study the solvability of the quaternary continuous classical boundary optimal control vector problem dominated by quaternary nonlinear parabolic boundary value problem with state constraints. The existence theorem for a quaternary continuous classical boundary optimal control vector with equality and inequality state constraints is stated and demonstrated under suitable assumptions. The mathematical formulation of the quaternary adjoint eqs. associated with the quaternary nonlinear parabolic boundary value problem with state constraints is discovered. The Fréchet derivative of the cost function and the constraints functions are derived. The necessary and sufficient theorems (conditions) for optimality of the quaternary continuous classical boundary optimal control vector problem are stated and demonstrated under suitable assumptions.
本文旨在研究由带状态约束的四元非线性抛物线边界值问题支配的四元连续经典边界最优控制向量问题的可解性。在适当的假设条件下,阐述并证明了具有相等和不相等状态约束的四元连续经典边界最优控制向量的存在定理。发现了与带状态约束的四元非线性抛物线边界值问题相关的四元邻接方程的数学表达式。导出了成本函数和约束函数的弗雷谢特导数。在适当的假设条件下,阐述并证明了四元连续经典边界最优控制向量问题最优性的必要和充分定理(条件)。
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引用次数: 0
Evaluation of some heart enzymes and Iron levels in β-thalassemia patients in Thi-Qar City, Iraq 评估伊拉克济加尔市β地中海贫血症患者的某些心肌酶和铁水平
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-11-19 DOI: 10.21123/bsj.2023.8352
Ahmed jaber Ibrahim, A. AL–Saeed
Beta thalassemia is one of the most common hereditary diseases in the world caused by a deficiency of globin chains. Heart disease is one of the main complications of this disease as a result of excess iron deposition in the cardiac tissues. Total of 100 patients of 2-18 years diagnosed with ß-TM were employed in the current study and admitted to Thi-Qar Center of Hereditary Blood Diseases in Thi-Qar city, Iraq, and 80 healthy participants, matched by age, and geographical area were adopted as control group. The current study included evaluating of serum Troponin I (c.TnI), Creatine kinase-MB isoenzyme (CK-MB), Apelin, aspartate aminotransferase (AST), and Lactate Dehydrogenase enzyme (LDH) of studied groups. The finding revealed a significant increase (p<0.01) of c.TnI, CK-MB, AST, and LDH levels as well as a significant decrease (p<0.01) in apelin level in all patients with ß-TM compared to the control group. Pearson's correlation coefficient (r) was also found between the biochemical parameters studied for ß-TM patients with ferritin level, were found a significant correlation (p<0.01) between ferritin level with CK-MB, LDH, and AST levels while there was no significant correlation (P>0.01) through apelin and c.TnI levels. The finding showed a clinical predictor to damage cardiac tissues in the near term, which portends the use of more efficient treatment protocols to remove excess iron from ß-TM patients.
β地中海贫血症是世界上最常见的遗传性疾病之一,由球蛋白链缺乏引起。心脏病是该病的主要并发症之一,因为过多的铁沉积在心脏组织中。在本次研究中,伊拉克济加尔市的济加尔遗传性血液病中心共收治了 100 名 2-18 岁的ß-TM 患者,并以 80 名年龄和地域相匹配的健康人作为对照组。本次研究包括评估研究组的血清肌钙蛋白 I(c.TnI)、肌酸激酶-MB 同工酶(CK-MB)、胰蛋白酶、天门冬氨酸氨基转移酶(AST)和乳酸脱氢酶(LDH)。研究结果表明,凋亡磷脂和 c.TnI 水平明显升高(p0.01)。该研究结果表明,ß-TM 患者的心脏组织在短期内会受到损害,这预示着需要采用更有效的治疗方案来清除患者体内过量的铁。
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引用次数: 0
Modifications for Quasi-Newton Method and Its Spectral Algorithm for Solving Unconstrained Optimization Problems 用于解决无约束优化问题的准牛顿法及其谱算法的修改
IF 0.6 Q3 MULTIDISCIPLINARY SCIENCES Pub Date : 2023-11-19 DOI: 10.21123/bsj.2023.8020
E. Sadraddin, I. S. Latif
In this paper, two modifications for spectral quasi-Newton algorithm of type BFGS are imposed. In the first algorithm, named SQNEI, a certain spectral parameter is used in such a step for BFGS algorithm differs from other presented algorithms. The second algorithm, SQNEv-Iv, has both new parameter position and value suggestion. In SQNEI and SQNEv-Iv methods, the parameters are involved in a search direction after an approximated Hessian matrix is updated. It is provided that two methods are effective under some assumptions. Moreover, the sufficient descent property is proved as well as the global and superlinear convergence for SQNEv-Iv and SQNEI.  Both of them are superior the standard BFGS (QNBFGS) and previous spectral quasi-Newton (SQNLC). However, SQNEv-Iv is outstanding SQNEI if it is convergent to the solution. This means that, two modified methods are in the race for the more efficiency method in terms less iteration numbers and consuming time in running CPU. Finally, numerical results are presented for the four algorithms by running list of test problems with inexact line search satisfying Armijo condition.
本文对 BFGS 类型的光谱准牛顿算法进行了两处修改。在第一种名为 SQNEI 的算法中,某个光谱参数被用于 BFGS 算法不同于其他算法的步骤中。第二种算法,即 SQNEv-Iv,则有新的参数位置和参数值建议。在 SQNEI 和 SQNEv-Iv 方法中,参数在近似黑森矩阵更新后参与搜索方向。这两种方法在某些假设条件下是有效的。此外,还证明了 SQNEv-Iv 和 SQNEI 的充分下降特性以及全局和超线性收敛性。 这两种方法都优于标准 BFGS(QNBFGS)和之前的谱准牛顿(SQNLC)。但是,如果 SQNEv-Iv 能收敛到解,则 SQNEI 更胜一筹。这意味着,这两种改进方法在迭代次数和 CPU 运行耗时方面都在争夺更高效的方法。最后,通过运行满足 Armijo 条件的非精确直线搜索测试问题列表,给出了四种算法的数值结果。
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引用次数: 0
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Baghdad Science Journal
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