检索结果-南通市图书馆

Weighted-exponential regression model:An alternative to the gamma regression model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Modeling, Simulation, and Scientific Computing 2019年第6期10卷 15-29页

作者： Emrah altun Department of Statistics Bartin University BartinTurkey

In this study,weighted-exponential regression model is proposed for modeling the right-skewed response variable as an alternative to the gamma regression *** maximum likelihood,method of moments,least-squares and weighted least-squares estimation methods are used to estimate unknown parameters of re-parametrized weightedexponential *** simulation study is conducted to compare the efficiencies of parameter estimation *** application on coalition duration dataset is given to demonstrate the usefulness of proposed regression model against the gamma regression *** residual analysis is performed to evaluate the accuracy of the fitted *** findings show that the weighted-exponential regression model provides better fits than the gamma regression model and could be a good choice for modeling the right-skewed response variable.

关键词： Weighted-exponential distribution maximum likelihood method of moments randomized quantile residuals gamma regression

A New Metaheuristic Approach to Solving Benchmark Problems: Hybrid Salp Swarm Jaya Algorithm

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第5期71卷 2923-2941页

作者： Erkan Erdemir Adem Alpaslan altun Department of Information Technologies Tokat Vocational and Technical Anatolian High SchoolMerkez/Tokat60030Turkey Department of Computer Engineering Faculty of TechnologyKonya Selcuk UniversitySelcuklu/Konya42130Turkey

Metaheuristic algorithms are one of the methods used to solve optimization problems and find global or close to optimal solutions at a reasonable computational *** with other types of algorithms,in metaheuristic algorithms,one of the methods used to improve performance and achieve results closer to the target result is the hybridization of *** this study,a hybrid algorithm(HSSJAYA)consisting of salp swarm algorithm(SSA)and jaya algorithm(JAYA)is *** speed of achieving the global optimum of SSA,its simplicity,easy hybridization and JAYA’s success in achieving the best solution have given us the idea of creating a powerful hybrid algorithm from these two *** hybrid algorithm is based on SSA’s leader and follower salp system and JAYA’s best and worst solution *** works according to the best and worst food source *** this way,it is thought that the leader-follower salps will find the best solution to reach the food *** hybrid algorithm has been tested in 14 unimodal and 21 multimodal benchmark *** results were compared with SSA,JAYA,cuckoo search algorithm(CS),firefly algorithm(FFA)and genetic algorithm(GA).As a result,a hybrid algorithm that provided results closer to the desired fitness value in benchmark functions was *** addition,these results were statistically compared using wilcoxon rank sum test with other *** to the statistical results obtained from the results of the benchmark functions,it was determined that HSSJAYA creates a statistically significant difference in most of the problems compared to other algorithms.

关键词： Metaheuristic optimization benchmark algorithm swarm hybrid

Use of centrifugal-gravity concentration for rejection of talc and recovery improvement in base-metal flotation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2016年第8期23卷 859-867页

作者： Bern Klein Naci Emre altun Hassan Ghaffari NBK Institute of Mining Engineering The University of British Columbia Department of Mining Engineering Middle East Technical University Tetra Tech Metallurgy

The possibility of using a centrifugal-gravity concentrator to reject Mg-bearing minerals and minimize metal losses in the flotation of base metals was evaluated. Sample characterization, batch scoping tests, pilot-scale tests, and regrind-flotation tests were conducted on a Ni flotation tailings stream. Batch tests revealed that the Mg grade decreased dramatically in the concentrate products. Pilot-scale testing of a continuous centrifugal concentrator（Knelson CVD6） on the flotation tailings revealed that a concentrate with a low mass yield, low Mg content, and high Ni upgrade ratio could be achieved. Under optimum conditions, a concentrate at 6.7% mass yield was obtained with 0.85% Ni grade at 12.9% Ni recovery and with a low Mg distribution（1.7%）. Size partition curves demonstrated that the CVD also operated as a size classifier, enhancing the rejection of talc fines. Overall, the CVD was capable of rejecting Mg-bearing minerals. Moreover, an opportunity exists for the novel use of centrifugal-gravity concentration for scavenging flotation tailings and/or after comminution to minimize amount of Mg-bearing minerals reporting to flotation.

关键词： flotation base metals talc centrifugation gravity concentrators

Strength properties of xanthan gum and guar gum treated kaolin at different water contents

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2021年第5期13卷 1160-1172页

作者： Irem Bozyigit Akbar Javadi Selim altun Department of Civil Engineering Ege UniversityBornova-IzmirTurkey College of Engineering Mathematics and Physical SciencesUniversity of ExeterExeterUK

Nowadays,using biopolymer as a ground improvement method has become very ***,since biopolymers are organic and degradable,their long-term effect is not fully *** this study,the effects of biopolymers on the mechanical behavior of kaolin clay were investigated through a comprehensive program of *** types of biopolymer,*** gum and guar gum were chosen to investigate the effect of biopolymer *** this purpose,specimens were prepared using standard Proctor energy at four different water contents(25%,30%35%and 40%)with 0.5%,1%,1.5%and 2%biopolymer *** specimens were cured for 1 d,7 d,28 d and 90 ***,some of the specimens were kept in the curing room for 3 years to observe the long-term effect of the *** the end of the curing periods,the specimens were subjected to unconfined compression test,and scanning electron microscopy(SEM)analysis was performed to observe the mechanism of strength *** results revealed that the unconfined compressive strength(UCS)of the specimens treated with biopolymers increased in all biopolymer inclusion levels and water contents up to a 90-d curing *** specimens containing xanthan gum,the maximum strength increase was observed at 25%water content and 2%xanthan gum with 90-d *** strength increased 5.23 times induced by xanthan gum addition when compared to the pure ***,the increase in strength reached 8.53 times in specimens treated with guar ***,increasing water content caused more ductile behavior,thus increasing the axial deformation.

关键词： Biopolymer Clay Unconfined compressive strength(UCS) Xanthan gum Guar gum Strength properties

A Study on Monotone Self-Dual Boolean Functions

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2017年第1期33卷 43-52页

作者： Mustafa altun Marc D.RIEDEL Electronics and Communication Engineering Istanbul Technical University Electrical and Computer Engineering University of Minnesota

This paper shows that monotone self-dual Boolean functions in irredundant disjuntive normal form （IDNF） do not have more variables than disjuncts. Monotone self-dual Boolean functions in IDNF with the same number of variables and disjuncts are examined. An algorithm is proposed to test whether a monotone Boolean function in IDNF with n variables and n disjuncts is self-dual. The runtime of the algorithm is O（n3）.

关键词： duality problem monotone Boolean functions self-dual Boolean functions

Potential biotherapeutic properties of lactic acid bacteria in foods

在线全文

学校读者我要写书评

暂无评论

Food Bioscience 2022年第2期46卷 942-950页

作者： Zerrin Erginkaya Gozde Konuray-altun Cukurova University Faculty of AgricultureDepartment of Food Engineering01330AdanaTurkey

Today,the use of microorganisms to produce substances that can be consumable,used as a food ingredient and have a positive effect on consumer health is attracting attention and studies in this field are ***,the therapeutic products produced by lactic acid bacteria(LAB)can be used in the food and pharmaceutical industry to create desirable characteristics of *** addition to the positive effects of LAB,probiotics and synbiotics have been known for many years,many studies examining postbiotics and paraprobiotics have attracted attention in recent *** therapeutic products obtained from different LAB may have different properties and should be investigated *** this paper,the biotherapeutic substances produced by LAB and their effects on health are summarized.

关键词： Biotherapeutic Lactic acid bacteria Paraprobiotic Postbiotic Probiotic Synbiotic

Vitamin B complex and vitamin B12 levels after peripheral nerve injury

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2016年第5期11卷 842-845页

作者： Idiris altun Ergül Belge Kurutas Department of Neurosurgery Kahramanmaras Sutcu Imam University Medical Faculty Kahramanmaras Turkey Department of Biochemistry Kahramanmaras Sutcu Imam University Medical Faculty Kahramanmaras Turkey

The aim of the present study was to evaluate whether tissue levels of vitamin B complex and vitamin B12 were altered after crush-induced peripheral nerve injury in an experimental rat model. A total of 80 male Wistar rats were randomized into one control（n = 8） and six study groups（1, 6, 12, 24 hours, 3, and 7 days after experimental nerve injury; n = 12 for each group）. Crush-induced peripheral nerve injury was performed on the sciatic nerves of rats in six study groups. Tissue samples from the sites of peripheral nerve injury were obtained at 1, 6, 12, 24 hours, 3 and 7 days after experimental nerve injury. Enzyme-linked immunosorbent assay results showed that tissue levels of vitamin B complex and vitamin B12 in the injured sciatic nerve were significantly greater at 1 and 12 hours after experimental nerve injury, while they were significantly lower at 7 days than in control group. Tissue level of vitamin B_（12） in the injured sciatic nerve was significantly lower at 1, 6, 12 and 24 hours than in the control group. These results suggest that tissue levels of vitamin B complex and vitamin B12 vary with progression of crush-induced peripheral nerve injury, and supplementation of these vitamins in the acute period may be beneficial for acceleration of nerve regeneration.

关键词： nerve regeneration sciatic nerve injury vitamin B complex vitamin B12 neural regeneration

Improved Electro Search Algorithm with Intelligent Controller Control System:ESPID Algorithm

在线全文

学校读者我要写书评

暂无评论

Intelligent Automation & Soft Computing 2023年第3期35卷 2555-2572页

作者： Inayet Hakki Cizmeci Adem Alpaslan altun Akseki Vocational High School Computer Technologies Department Alanya Alaaddin Keykubat UniversityAntalya07425Turkey Computer Engineering Department Selcuk UniversityFaculty of TechnologyKonya42100Turkey

Studies have established that hybrid models outperform single *** particle swarm algorithm(PSO)-based PID(proportional-integral-derivative)controller control system is used in this study to determine the parameters that directly impact the speed and performance of the Electro Search(ESO)algorithm to obtain the global optimum *** algorithm was created by integrating this system with the ESO *** improved ESPID algorithm has been applied to 7 multi-modal benchmark test *** acquired results were compared to those derived using the ESO,PSO,Atom Search Optimization(ASO),and Vector Space Model(VSM)*** a consequence,it was determined that the ESPID algorithm’s mean score was superior in all ***,while comparing the mean duration value and standard deviations,it is observed that it is faster than the ESO algorithm and produces more accurate results than other *** algorithm has been used for the least cost problem in the production of pressure vessels,which is one of the real-life *** results were compared with ESO,Genetic algorithm and *** was found to be superior to other methods with the least production cost value of 5885.452.

关键词： Electro search algorithm intelligent PID optimization multi-optimization

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

含碳酸钙的海泡石钻井液的封堵性能

石油勘探与开发 2017年第3期44卷 446-455页

作者： ETTEHADI Ali altun Gursat Department of Petroleum and Natural Gas Engineering Istanbul Technical University Department of Petroleum and Natural Gas Engineering Izmir Katip ?elebi University

通过室内实验和理论分析,研究了不同温度、压力条件下添加碳酸钙前后海泡石水基钻井液对不同渗透性地层的封堵性能,论证将碳酸钙作为堵漏剂添加到海泡石钻井液中的可行性。在实验温度为27~204℃、实验压力为2 070 kPa和6 895 kPa条件下... 详细信息

通过室内实验和理论分析,研究了不同温度、压力条件下添加碳酸钙前后海泡石水基钻井液对不同渗透性地层的封堵性能,论证将碳酸钙作为堵漏剂添加到海泡石钻井液中的可行性。在实验温度为27~204℃、实验压力为2 070 kPa和6 895 kPa条件下进行流变性和滤失性测试,结果表明,除了在149℃时,其他各温度下海泡石钻井液流变性质较好、悬固能力较强,高温高压滤失量较低。孔隙堵塞器(PPA)实验中用孔径10~90μm的渗透性陶瓷盘模拟地层,实验结果表明,不含碳酸钙的海泡石钻井液不能封堵孔隙,而含碳酸钙的海泡石钻井液可在较短时间内封堵孔隙,且在高温下也能保持碳酸钙颗粒悬浮,使用温度可高达193℃。扫描电镜分析及理想充填理论分析结果验证了PPA实验结果。

关键词：海泡石钻井液钻井液漏失封堵性能热稳定性碳酸钙颗粒高温高压钻井