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Research 2021年第1期2021卷 112-124页

作者： Guanzhao Wu Yangxue Liu Zhen Yang Liulei Ma Yao Tang Xianliang Zhao Hossein Rouh Qixuan Zheng Peng Zhou Jia-Yin Wang Farhan Siddique Sai Zhang Shengzhou Jin Daniel Unruh Adelia JAAquino Hans Lischka Kristin M.Hutchins Guigen Li Department of Chemistry and Biochemistry Texas Tech UniversityLubbockTexas 79409-1061USA Institute of Chemistry and Biomedical Sciences School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210093China School of Pharmaceutical Sciences and Technology Tianjin UniversityTianjin 300072China Department of Mechanical Engineering Texas Tech UniversityLubbockTX 79409USA

Conjugated polymers and oligomers have great potentials in various fields,especially in materials and biological sciences because of their intriguing electronic and optoelectronic *** recent years,the through-space conjugation system has emerged as a new assembled pattern of multidimensional ***,a novel series of structurally condensed multicolumn/multilayer 3D polymers and oligomers have been designed and synthesized through one-pot Suzuki polycondensation(SPC).The intramolecularly stacked arrangement of polymers can be supported by either X-ray structural analysis or computational *** all cases,polymers were obtained with modest to good yields,as determined by GPC and 1 ***-TOF analysis has proven the speculation of the step-growth process of this *** computational study of ab initio and DFT calculations based on trimer and pentamer models gives details of the structures and the electronic *** results of optical and AIE research confirmed by calculation indicates that the present work would facilitate the research and applications in materials.

关键词： properties transition materials

High day and night temperatures impact on cotton yield and quality——current status and future research direction

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Journal of Cotton Research 2023年第3期6卷 209-225页

作者： SAINI Dinesh K. IMPA S.M. MCCALLISTER Donna PATIL Gunvant B. ABIDI Noureddine RITCHIE Glen JACONIS S.Y. JAGADISH Krishna S.V. Department of Plant and Soil Science Texas Tech UniversityLubbockTX 79410USA Department of Agricultural and Applied Economics Texas Tech UniversityLubbockTX 79410USA Institute of Genomics for Crop Abiotic Stress Tolerance Texas Tech UniversityLubbockTX 79410USA Fiber and Biopolymer Research Institute Texas Tech UniversityLubbockTX 79410USA Cotton Incorporated CaryNC 27513USA

Heat waves,and an increased number of warm days and nights,have become more prevalent in major agricultural regions of the *** well adapted to semi-arid regions,cotton is vulnerable to high temperatures,particularly during flowering and boll *** maintain lint yield potential without compromising its quality under high-temperature stress,it is essential to understand the effects of heat stress on various stages of plant growth and development,and associated tolerance *** ongoing efforts to gather data on the effects of heat stress on cotton growth and development,there remains a critical gap in understanding the distinct influence of high temperatures during the day and night on cotton yield and ***,identifying mechanisms and target traits that induce greater high day and night temperature tolerance is essential for breeding climate-resilient cotton for future uncertain *** bridge these knowledge gaps,we embarked on a rigorous and comprehensive review of published literature,delving into the impact of heat stress on cotton yields and the consequential losses in fiber *** review encompasses information on the effects of heat stress on growth,physiological,and biochemical responses,fertilization,cotton yield,and ***,we discuss management options for minimizing heat stress-induced damage,and the benefits of integrating conventional and genomics-assisted breeding for developing heat-tolerant cotton ***,future research areas that need to be addressed to develop heat-resilient cotton are proposed.

关键词： Controlled environment Cotton Fiber yield and quality Heat stress Heat tents Reproductive failure

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Fast and Accurate Predictor-Corrector Methods Using Feedback-Accelerated Picard Iteration for Strongly Nonlinear Problems

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Computer Modeling in Engineering & Sciences 2024年第5期139卷 1263-1294页

作者： Xuechuan Wang Wei He Haoyang Feng Satya N.Atluri School of Astronautics Northwestern Polytechnical UniversityXi’an710072China Department of Mechanical Engineering Texas Tech UniversityLubbock79409USA

Although predictor-corrector methods have been extensively applied,they might not meet the requirements of practical applications and engineering tasks,particularly when high accuracy and efficiency are necessary.A novel class of correctors based on feedback-accelerated Picard iteration(FAPI)is proposed to further enhance computational *** optimal feedback terms that do not require inversion of matrices,significantly faster convergence speed and higher numerical accuracy are achieved by these correctors compared with their counterparts;however,the computational complexities are comparably *** advantages enable nonlinear engineering problems to be solved quickly and accurately,even with rough initial guesses from elementary *** proposed method offers flexibility,enabling the use of the generated correctors for either bulk processing of collocation nodes in a domain or successive corrections of a single node in a finite difference *** our method,the functional formulas of FAPI are discretized into numerical forms using the collocation *** collocated iteration formulas can directly solve nonlinear problems,but they may require significant computational resources because of the manipulation of *** address this,the collocated iteration formulas are further converted into finite difference forms,enabling the design of lightweight predictor-corrector algorithms for real-time *** generality of the proposed method is illustrated by deriving new correctors for three commonly employed finite-difference approaches:the modified Euler approach,the Adams-Bashforth-Moulton approach,and the implicit Runge-Kutta ***,the updated approaches are tested in solving strongly nonlinear problems,including the Matthieu equation,the Duffing equation,and the low-earth-orbit tracking *** numerical findings confirm the computational accuracy and efficiency of the derived predictor-correc

关键词： Predictor-corrector method feedback-accelerated Picard iteration nonlinear dynamical system real-time computation

Pharmacologic inducers of the uric acid exporter ABCG2 as potential drugs for treatment of gouty arthritis

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Asian Journal of Pharmaceutical Sciences 2020年第2期15卷 173-180页

作者： Bojana Ristic Mohd Omar Faruk Sikder Yangzom D.Bhutia Vadivel Ganapathy Department of Cell Biology and Biochemistry Texas Tech University Health Sciences CenterLubbockTX 79430United States

Uric acid is the end product of purine catabolism and its plasma levels are maintained below its maximum solubility in water(6–7 mg/dl).The plasma levels are tightly regulated as the balance between the rate of production and the rate of excretion,the latter occurring in urine(kidney),bile(liver)and feces(intestinal tract).Reabsorption in kidney is also an important component of this *** excretion and reabsorption are mediated by specific *** of the balance between production and excretion leads to hyperuricemia,which increases the risk of uric acid crystallization as monosodium urate with subsequent deposition of the crystals in joints causing gouty ***-of-function mutations in the transporters that mediate uric acid excretion are associated with *** ATP-Binding Cassette exporter ABCG2 is important in uric acid excretion at all three sites:kidney(urine),liver(bile),and intestine(feces).Mutations in this transporter cause gout and these mutations occur at significant prevalence in general ***,mutations that are most prevalent result only in partial loss of transport ***,if the expression of these partially defective transporters could be induced,the increased number of the transporter molecules would compensate for the mutation-associated decrease in transport function and hence increase uric acid *** such,pharmacologic agents with ability to induce the expression of ABCG2 represent potentially a novel class of drugs for treatment of gouty arthritis.

关键词： Uric acid excretion Intestine ABCG2 Loss-of-function mutations Gouty arthritis Pharmacologic inducers

应用电容电阻模型研究大型成熟油田井间连通性

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石油勘探与开发 2017年第1期44卷 130-136页

作者： JAMALI Ali ETTEHADTAVAKKOL Amin Texas Tech University Lubbock TX 79409 USA

针对电容电阻模型在大型成熟油田应用时存在的问题,选用了生产井电容电阻模型(CRMP),提出了其在大型成熟油田的简化应用方法,并进行了实例分析。结合大型成熟油田的特征,给出了CRMP简化推导方法。通过优化求解方法缩短求解时间、提高收... 详细信息

针对电容电阻模型在大型成熟油田应用时存在的问题,选用了生产井电容电阻模型(CRMP),提出了其在大型成熟油田的简化应用方法,并进行了实例分析。结合大型成熟油田的特征,给出了CRMP简化推导方法。通过优化求解方法缩短求解时间、提高收敛速率,包括应用全局优化算法,计算CRMP目标函数的解析梯度向量及Hessian矩阵并应用于解算器中,进行参数缩放等,使CRMP可以应用于大型油田。通过逐步历史拟合可提高CRMP模拟结果的可靠性。实例分析结果表明,采用该方法得到的连通性分析结果与生产实际相符,验证了该方法的可靠性。根据CRMP模拟结果,可以有效分析注入井与其周围生产井的连通性,并进行相关分析,例如判断哪些注水井可以改注二氧化碳以及某二氧化碳注入井是否适宜注二氧化碳等。

关键词：电容电阻模型成熟油田井间连通性提高采收率

Potential cotton aphid, Aphis gossypii, population suppression by arthropod predators in upland cotton

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Insect Science 2013年第6期20卷 778-788页

作者： Ram B. Shrestha Megha N. Parajulee Texas A&M University AgriLife Research and Extension Center 1102 E. FM 1294 Lubbock TX 79403 United States

The cotton aphid, Aphis gossypii Glover, predation rate of convergent lady beetle, Hippodamia convergens Guerin-Meneville, was determined by assigning a single predator randomly to each of four prey density treatments in the laboratory. Prey densities included 25, 50, 100, and 200 aphids per Petri dish arena. Predation response was recorded at 1, 4, 8, 16, 24, and 48 h after assigning predators to their prey treatments. Rate of consumption increased through time, with all 25 aphids consumed during the first 4 h of the experiment. At the highest density, adult lady beetle consumed on average 49, 99, 131, 163, 183, and 200 aphids within 1, 4, 8, 16, 24 and 48 h, respectively. Predators showed a curvilinear feeding response in relation to total available time, indicating that convergent lady beetles have the potential to suppress larger populations of aphids through continuous feeding by regulating their predation efficiency during feeding. The analysis of age-specific mortality in absence of prey revealed that lady beetles could survive for an extended period of time （more than 2 weeks） without prey. The ability of a predator to survive without prey delays or prevents the rebound of pest populations that is a significant factor in natural biological control. A two-year field sampling of 10 cotton arthropod predator species showed that spiders （27%） were the most dominant foliage dwelling predators in the Texas High Plains cotton followed by convergent lady beetles （23.5%）, hooded beetles （13.5%）, minute pirate bugs （11%）, green lacewings （9.5%）, bigeyed bugs （7.5%）, scymnus beetles （3%）, soft-winged flower beetles （2%）, damsel bugs （1.5%）, and assassin bugs （1.5%）. A field cage study showed that one H. convergens adult per plant released at prey density of one aphid per leaf kept the aphid population below economic threshold for the entire growing season.

关键词： Aphis gossypii biological control cotton IPM functional response Hippo-damia convergens natural suppression

Optimization of acid fracturing for a tight carbonate reservoir

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Petroleum 2020年第1期6卷 70-79页

作者： Aymen Al-Ameri Talal Gamadi Bob L.Herd Department of Petroleum Engineering Texas Tech University2500 BroadwayLubbockTX79409USA

In this study,acid fracturing treatments were simulated for a tight limestone reservoir within a shale formation using FRACPRO *** purpose was to investigate the optimum acid fracturing design that leads to a higher fracture etched length and width,and higher fracture ***,the impact of the rock-acid contact time and whether to consider a post-flush or fluids flowback,on the acid fracturing outcomes were also investigated.A simple geological model was constructed which consists of different lithological *** acid fracturing design scenarios were considered starting from a single stage of acid injection to multi-stage *** multi-stage acid treatment,alternate acid-slickwater injection was *** HCl acids with different concentrations and other acids that are already included in FRACPRO database were *** results showed that the acid loss during post-flush is among the main problems of the acid fracturing in tight carbonate shale *** the single stage of acid injection,it is recommended to flow back the acid after well shut-in instead of considering a post-flush *** multi-stage alternate acid slickwater injection reduces or even eliminated the acid ***,it is recommended to inject a slickwater before well shut-in to reduce the rock-acid contact time,thus reducing the formation *** results also showed that the created fracture etched width decreases and the fracture etched length increases as the fracturing stages *** this study,because of the low carbonate layer permeability and compressive strength,a two-stage alternate 28%HCl and slickwater injection with a post-flush stage is recommended.

关键词： Acid fracturing Tight carbonate Acid loss Low compressive strength Single stage acid fracturing Multi-stage acid fracturing

Optimize Evacuation Route Considering the Operational Cost as a Constraint

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International Journal of Transportation Science and Technology 2013年第1期2卷 65-78页

作者： Hao Xu Hongchao Liu Department of Civil&Environmental Engineering Texas Tech UniversityLubbockTX 79409

Evacuation planning involves modeling,operation,and management of evacuation routes before and during emergency *** paper presents the development and examination of a route optimization model which considers the operational cost as a *** study is focused on the situation when the backbone evacuation route,usually the interstate highway system,is over congested and some traffic need to be directed to local street *** intersections are the key control components of a street network,traffic operations at intersections cannot be neglected in route *** order to consider the operational cost in the modeling process,a street network is first presented by an extended graph network which has cost information associated with each ***,a system optimal traffic assignment approach is used to select and optimize the evacuation *** property of the approach is examined by a numerical test which includes a network composed of a backbone interstate highway and a grid network with over 30 intersections.

关键词： network intersection backbone

A primer on stochastic epidemic models:Formulation,numerical simulation,and analysis

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Infectious Disease Modelling 2017年第2期2卷 128-142页

作者： Linda J.S.Allen Department of Mathematics and Statistics Texas Tech UniversityLubbockTX 79409-1042USA

Some mathematical methods for formulation and numerical simulation of stochastic epidemic models are ***,models are formulated for continuous-time Markov chains and stochastic differential *** well-known examples are used for illustration such as an SIR epidemic model and a host-vector malaria *** methods for approximating the probability of a disease outbreak are also discussed.

关键词： Branching process Continuous-time Markov chain Minor outbreak Stochastic differential equation

Duration of a minor epidemic

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Infectious Disease Modelling 2018年第1期3卷 60-73页

作者： William Tritch Linda J.S.Allen Department of Mathematics and Statistics Texas Tech UniversityLubbockTX 79409-1042USA

Disease outbreaks in stochastic SIR epidemic models are characterized as either minor or ***01,they can be minor or *** 1955,Whittle derived formulas for the probability of a minor or a major epidemic.A minor epidemic is distinguished from a major one in that a minor epidemic is generally of shorter duration and has substantially fewer cases than a major *** this investigation,analytical formulas are derived that approximate the probability density,the mean,and the higher-order moments for the duration of a minor *** analytical results are applicable to minor epidemics in stochastic SIR,SIS,and SIRS models with a single infected *** probability density for minor epidemics in more complex epidemic models can be computed numerically applying multitype branching processes and the backward Kolmogorov differential ***0 is close to one,minor epidemics are more common than major epidemics and their duration is significantly longer than whenR0≪1 orR»01.

关键词： Birth-death process Branching process Epidemic model Markov chain