An Opposition-Based Learning-Based Search Mechanism for Flying Foxes Optimization Algorithm

The flying foxes optimization(FFO)algorithm,as a newly introduced metaheuristic algorithm,is inspired by the survival tactics of flying foxes in heat wave environments.FFO preferentially selects the best-performing individuals.This tendency will cause the newly generated solution to remain closely tied to the candidate optimal in the search area.To address this issue,the paper introduces an opposition-based learning-based search mechanism for FFO algorithm(IFFO).Firstly,this paper introduces niching techniques to improve the survival list method,which not only focuses on the adaptability of individuals but also considers the population’s crowding degree to enhance the global search capability.Secondly,an initialization strategy of opposition-based learning is used to perturb the initial population and elevate its quality.Finally,to verify the superiority of the improved search mechanism,IFFO,FFO and the cutting-edge metaheuristic algorithms are compared and analyzed using a set of test functions.The results prove that compared with other algorithms,IFFO is characterized by its rapid convergence,precise results and robust stability.

An Overview of the Achievements of Modern Research on the Flying Shadow Pavilion Pictorial

The current academic research on the Dian Shi Zhai Pictorial founded in 1884 has been perfected,but there is very little research on the Flying Shadow Pavilion Pictorial,which can be said to be derived from Dian Shi Zhai Pictorial terms of both content and form,and which was founded by the Haiist painter Wu Youru in 1890 in order to reward the increasing number of admirers,but it is still in the initial stage.Flying Shadow Pavilion Pictorial consisted of four parts:pictures of ladies in Shanghai costumes,news about current affairs,pictures of animals,and compilations of women,each of which was accompanied by the then popular notebooks,which were popular at the time among the then readers because of the matching of pictures with text and the mixing of narratives and discussions.This paper takes Flying Shadow Pavilion Pictorial as the main object,summarizes the existing literature about Flying Shadow Pavilion Pictorial,points out the deficiencies of the current research on this basis,and points out the development trend of Flying Shadow Pavilion Pictorial in the future research.

Plasma density transition-based electron injection in laser wake field acceleration driven by a flying focus laser

By using a high-intensity flying focus laser,the dephasingless[Phys.Rev.Lett.124134802(2020)]or phase-locked[Nat.Photon.14475(2020)]laser wakefield acceleration(LWFA)can be realized,which may overcome issues of laser diffraction,pump depletion,and electron dephasing which are always suffered in usual LWFA.The scheme thus has the potentiality to accelerate electrons to Te V energy in a single acceleration stage.However,the controlled electron injection has not been self-consistently included in such schemes.Only external injection was suggested in previous theoretical studies,which requires other accelerators and is relatively difficulty to operate.Here,we numerically study the actively controlled density transition injection in phase-locked LWFA to get appropriate density profiles for amount of electron injection.The study shows that compared with LWFA driven by lasers with fixed focus,a larger plasma density gradient is necessary.Electrons experience both transverse and longitudinal loss during acceleration due to the superluminal group velocity of the driver and the variation of the wakefield structure.Furthermore,the periodic deformation and fracture of the flying focus laser in the high-density plasma plateau make the final injected charge also depend on the beginning position of the density downramp.Our studies show a possible way for amount of electron injection in LWFA driven by flying focus lasers.

LSTDA: Link Stability and Transmission Delay Aware Routing Mechanism for Flying Ad-Hoc Network (FANET)

The paper presents a new protocol called Link Stability and Transmission Delay Aware(LSTDA)for Flying Adhoc Network(FANET)with a focus on network corridors(NC).FANET consists of Unmanned Aerial Vehicles(UAVs)that face challenges in avoiding transmission loss and delay while ensuring stable communication.The proposed protocol introduces a novel link stability with network corridors priority node selection to check and ensure fair communication in the entire network.The protocol uses a Red-Black(R-B)tree to achieve maximum channel utilization and an advanced relay approach.The paper evaluates LSTDA in terms of End-to-End Delay(E2ED),Packet Delivery Ratio(PDR),Network Lifetime(NLT),and Transmission Loss(TL),and compares it with existing methods such as Link Stability Estimation-based Routing(LEPR),Distributed Priority Tree-based Routing(DPTR),and Delay and Link Stability Aware(DLSA)using MATLAB simulations.The results show that LSTDA outperforms the other protocols,with lower average delay,higher average PDR,longer average NLT,and comparable average TL.

2021—2023年厦门市蝇类密度及抗药性监测结果分析

目的掌握厦门市蝇类的种群分布、季节消长和抗药性情况,为制定综合防制措施提供科学依据。方法采用笼诱法和目测法进行蝇密度监测,采用药膜法进行家蝇抗药性测定。结果厦门市2021—2023年共捕获蝇类609只,平均蝇密度为1.27只/笼;家蝇和市蝇为优势蝇种,构成比分别为31.69%和26.27%;不同生境蝇密度以农贸市场最高。防蝇设施合格率为78.67%。家蝇对毒死蜱、氯菊酯、残杀威分别产生了不同程度的抗药性,抗性倍数分别为5.72、26.26、>100.91。结论厦门市应加强农贸市场等重点场所环境综合治理,做好环境卫生、清除孳生地与集中杀灭,加强防蝇设施建设,提高防蝇设施合格率,降低蝇类密度。提倡科学用药,以延缓病媒生物的抗药性发展。

肺鳞状细胞乳头状瘤8例临床病理分析

1954 年支气管鳞状细胞乳头状瘤首次被报道[1],目前认为此种肿瘤是支气管黏膜上皮发生鳞状化生,从而形成良性的乳头状增生性肿瘤,比较罕见。临床上一般常发生在支气管主干开口,也有报道显示可以发生在叶及段支气管。通常成人常见,也可以发生在儿童及青年人,1998年FLIEDER等[2]报道27 例鳞状细胞乳头状瘤中以男性多发。研究发现该肿瘤与HPV感染具有相关性,尤其是与HPV6、HPV11型感染密切相关[3]。

基于SFFS多特征选择的航拍图像目标检测

针对航拍图像目标多变、目标角度变化丰富以及背景复杂等特点,提出基于SFFS(Sequential Floating Forward Selection)多特征选择的航拍图像目标检测方法。首先,引入BING(Binarized Normed Gradients)算法进行目标粗定位,克服航拍图像数据量大、检测效率低等问题。其次,提取航拍图像的RI-LBP (Rotation Invariant LBP)特征、FD(Fourier Descriptor)形状特征和RIFF(Rotation Invariant Fast Feature)特征对航拍图像进行描述,避免单一特征描述能力不足带来的误检测率高的问题。最后,基于SFFS贝叶斯分类算法对RI-LBP特征、FD特征和RIFF特征集合进行最优子集选择,以进一步提高特征的泛化性与鲁棒性。实验结果表明,该多特征航拍图像目标检测算法不仅对航拍角度变化具有更强的鲁棒性,且在减少特征维数的同时,提高了目标检测的平均准确率,满足实时性的需求。

基于两类媒介的炭疽传播模型的全局动力学分析

为了研究动物种群中媒介对炭疽传播的影响,该文依据尸食性蝇与血食性蝇的传播机制,建立了一个确定性传染病模型.利用微分方程基本定理证明了模型解的非负性和有界性,给出了平衡点存在的充分条件,定义了模型的几类再生数,利用线性化方法和M-矩阵等方法对平衡点的稳定性进行了分析,并研究了疾病的持久性.利用数值模拟研究了参数对基本再生数的影响.研究结果表明:及时清理染病尸体,尽量消除苍蝇的繁殖地点,对苍蝇使用杀虫剂对炭疽在动物种群中传播具有一定的抑制作用.

基于MC2045的1550nm的SFF光接收机噪声特性分析及设计

分析了光接收机噪声特性,讨论了Peraonick定义的加权常数I1I2I3和S1与输入输出脉冲的形状、输入光功率产生的与信号有关的等效输入噪声功率之间的关系,选择适当的灵敏度与动态范围,具体阐述了光收发合一模块SFF中接收部分构成,设计出基于MC2045的1550nm的SFF。

Utilization of Basalt Saw Mud as a Spherical Porous Functional Aggregate for the Preparation of Ordinary Structure Concrete

To promote the production and application of artificial aggregates,save natural sand resources and protect the ecological environment,we evaluated the feasibility of using spherical porous functional aggregates(SPFAs) formed by basalt saw mud under autoclave curing in ordinary structural concrete.In our work,two types of prewetted functional aggregates were taken as replacements for natural aggregates with different volume substitution rates(0%,5%,10%,15%,20%,25%,and 30%) in the preparation of ordinary structural concrete with water-to-binder ratios(W/B) of 0.48 and 0.33.The effects of the functional aggregate properties and content,W/B,and curing age on the fluidity,density,mechanical properties and autogenous shrinkage of ordinary concrete were analyzed.The experimental results showed that the density of concrete declined at a rate of not more than 5%,and the 28 d compressive strength could reach 31.0-68.2 MPa.Low W/B,long curing age and high-quality functional aggregates were conducive to enhancing the mechanical properties of SPFAs concrete.Through the rolling effects,SPFAs can optimize the particle gradation of aggregate systems and improve the fluidity of concrete,and the water stored inside SPFAs provides an internal curing effect,which prolongs the cement hydration process and considerably reduces the autogenous shrinkage of concrete.SPFAs exhibits high strength and high density,as well as being more cost-effective and ecological,and is expected to be widely employed in ordinary structural concrete.

腐食性食蚜蝇分子生物学种类鉴定

对长沙市内采集到的四种腐食性食蚜蝇进行种类鉴定,确定是否为目的食蚜蝇。通过形态学方法检索食蚜蝇的形态特征,并同时提取4种食蚜蝇基因组DNA,对线粒体细胞色素C氧化酶亚基Ⅰ(COⅠ)基因片段进行PCR扩增和测序,测序结果在Gen Bank中进行比对,采用邻接法构建系统进化树。结果表明,采获的四种食蚜蝇的形态等与目的食蚜蝇特征相符,分别为羽芒宽盾蚜蝇、棕腿斑眼蚜蝇、灰带管蚜蝇和长尾管蚜蝇,其COⅠ基因序列在Gen Bank中进行比对,序列相似度都极高,基于COⅠ序列的系统发育进化树显示,灰带管蚜蝇和长尾管蚜蝇为同一分支。本研究结果为食蚜蝇的后续研究提供了理论依据。

中国福建黄鬃长足虻属一新种记述(双翅目:长足虻科)

记述采自中国福建省武夷山的黄鬃长足虻属1新种:武夷山黄鬃长足虻Chrysotimus wuyishanensis Liu&Yang sp.nov.,提供了该种的整体图和解剖生殖器图,并与近似种进行了比较。

2022—2023年山东省金乡县蝇类密度监测情况分析

目的 掌握金乡县人居及周边环境蝇类种群构成、密度、分布特点和季节消长规律,为蝇类防控工作提供科学依据。方法 以红糖食醋为诱饵,采用笼诱法在每年3—11月监测不同生境、不同种群的蝇类密度进行统计分析。结果 以厩腐蝇和麻蝇为主要优势蝇种,构成比分别为38.92%和21.34%。蝇类密度高峰期为6—9月;在农贸市场、绿化带、餐饮外环境、居民区生境中,蝇密度依次为18.25、11.72、6.25、4.53只/笼。结论 厩腐蝇、麻蝇为优势蝇种,6—9月是蝇类发生关键时期,农贸市场和绿化带是蝇类发生的重点环境,应注意在高峰期前对蝇类采取防控措施。

4-(4-乙酰氧基苯基)-2-丁酮在实蝇防控中的研究与应用进展

实蝇分布范围广泛,寄主种类多样,危害十分严重,经济损失巨大,对其防治的时间紧迫性与经济重要性与日俱增。检验检疫及农业、物理、化学和生物防治都是常见的实蝇害虫防治方法。能够刺激实蝇行为反应的引诱剂作为一种高效环保的害虫防治策略在实蝇防治体系中占有重要地位。按照不同分类标准,实蝇引诱剂既可以分为性诱剂、食诱剂和植物源诱剂;又可以分为雄性实蝇引诱剂和雌(双)性实蝇引诱剂。其中,雄性实蝇引诱剂特异性强、效果显著。1960年首次报道雄性实蝇引诱剂4-(4-乙酰氧基苯基)-2-丁酮(诱蝇酮)对实蝇的显著吸引效果以来,它一直被用于监测和诱捕靶标实蝇。应用于调查监测时,诱蝇酮可以与多种类型的诱芯与诱捕器一起使用,实现效能最大化。诱蝇酮不仅可以单独使用引诱实蝇,而且可以与其他诱剂与菌液等混配使用。而且,诱蝇酮在发挥其基础引诱功能的同时,还会影响靶标实蝇的行为和生理以及非靶标昆虫的生存。因此,本文重点从调查监测、引诱灭杀、吸引取食、对非靶标昆虫影响等方面对诱蝇酮在实蝇害虫防治中的研究和应用进展进行综述,并对实蝇害虫诱饵站引诱防治与害虫自动测报的发展,诱捕的影响因素与引诱剂在害虫综合防治中的作用等做出合理展望,以期为实蝇害虫引诱技术的研究提供理论基础。

基于IWOA-BP神经网络图像复原

针对传统复原算法在退化图像复原过程中存在明显滞后的问题,建立了一种改进的鲸鱼算法(Improved Whale Optimization Algorithm,IWOA)-BP神经网络图像复原模型。首先,通过Tent混沌增强初始种群的均匀性和多样性;其次,采用非线性权重和改进的收敛因子,平衡算法的全局搜索与局部寻优能力;最后,结合Levy飞行策略更新个体位置,帮助算法跳出局部最优。随后采用经典图像数据,建立IWOA-BP模型。选取PSNR、SSIM和NMSE作为网络模型的评价指标,与BP、GWO-BP、WOA-BP进行对比。实验结果表明IWOA-BP模型图像复原视觉效果更好,提高了图像复原的质量。

米勒重复理论视角下《蝇王》中的重复现象

《蝇王》中的重复现象是探求小说主题内涵及意义构成的关键。从微观处着眼,重复的意象以隐喻的形式出现,如“蝇王”象征人性之恶;从中观层面看,人物和事件复现经典原型,如西蒙以耶稣为原型,是真理的殉道者;从宏观角度探究,《蝇王》创新发展荒岛文学的主题,探索人性善恶。由此小说中的重复现象由点到面,层层递进地揭示出“人性中深谙恶”这一主题意义。

养殖场的蝇类危害及防控方法

蝇类是重要的病媒昆虫,其幼虫可在养殖场的粪便及未经处理的动物尸体中大量孳生。圈舍内的大量蝇虫可通过影响畜禽休息和吸食血液等方式袭扰牲畜,降低其生产性能。更重要的是,蝇类的体表和体内可携带大量致病菌、病毒、寄生虫及虫卵等病原体;蝇虫具有边食、边吐、边排的习性,可机械性地传播各种病原体,是很多疾病的重要媒介。另外,一些蝇类的幼虫本身就是蝇蛆症的病原。因此,种群数量不受控制的蝇类可对畜禽和人类的健康造成严重威胁。养殖场蝇类的综合防控措施包括环境治理、化学防治、生物防治、物理或机械防治等。口服抗蝇蛆药是化学防治的一种,该类药物为昆虫生长调节剂,对畜禽毒性较低,混饲给药后在肠道吸收极少,随粪便排出,可阻断粪便中蝇蛆的发育而减少成蝇的数量。目前,常用的畜禽口服抗蝇蛆药有环丙氨嗪、除虫脲。本文综述了蝇类害虫的主要生物学习性、对养殖业的危害、综合防控措施以及口服抗蝇蛆药的应用情况,以期为养殖业的蝇害综合防控提供帮助,为口服抗蝇蛆药的开发提供参考。

One new species in the genus Elaphropeza(Diptera:Empididae)from Chongqing,China

Elaphropeza is distributed worldwide with over 220 known species,of which 61 species were known to occur in China.Two species of Elaphropeza are reported from Chongqing for the first time.One species,Elaphropeza chongqingana sp.nov.,is described as new to science.A key to the species of Elaphropeza from Chongqing is presented.

Mechanism study of Cu(Ⅱ) adsorption from acidic wastewater by ultrasonic-modified municipal solid waste incineration fly ash

High concentrations of copper ions(Cu(Ⅱ)) in water will pose health risks to humans and the ecological environment. Therefore, this study aims to utilize ultrasonic-cured modified municipal solid waste incineration(MSWI) fly ash for Cu(Ⅱ) adsorption to achieve the purpose of “treating waste by waste.” The effects of p H, adsorption time, initial concentration, and temperature on the modified MSWI fly ash’s adsorption efficiency were systematically studied in this article. The adsorption performance of the modified MSWI fly ash can be enhanced by the ultrasonic modification. At pH = 2, 3 and 4, the adsorption capacity of the modified MSWI fly ash for Cu(Ⅱ) increased by 2.7, 1.9 and 1.2 times, respectively. Furthermore, it was suggested that the adsorption process of the modified MSWI fly ash can be better simulated by the pseudo-second-order kinetic model, with a maximum adsorption capacity calculated by the Langmuir model of 24.196 mg.g-1. Additionally, the adsorption process is spontaneous,endothermic, and chemisorption-dominated from the thermodynamic studies(ΔH and ΔS > 0, ΔG < 0).Finally, the enhanced adsorption performance of the modified MSWI fly ash for Cu(Ⅱ) may be attributed to electrostatic interaction and chelation effects.

Barley chitinase genes expression revamp resistance against whitefly (Bemisia Tabaci) in transgenic cotton (Gossypium hirsutum L.)

Background Chitinase is an enzyme that hydrolyzes chitin,a major component of the exoskeleton of insects,including plant pests like whiteflies.The present study aimed to investigate the expression of chemically synthesized barley ch1 and chi2 genes in cotton(Gossypium hirsutum)through Agrobacterium-mediated transformation.Fifty-five putative transgenic cotton plants were obtained,out of which fifteen plants successfully survived and were shifted to the field.Using gene-specific primers,amplification of 447 bp and 401 bp fragments confirmed the presence of the ch1 and chi2 genes in five transgenic cotton plants of the T0 generation.These five plants were further evalu-ated for their mRNA expression levels.The T0 transgenic cotton plants with the highest mRNA expression level and better yield performance in field,were selected to raise their subsequent progenies.Results The T1 cotton plants showed the highest mRNA expression levels of 3.5-fold in P10(2)for the ch1 gene and 3.7-fold in P2(1)for the chi2 gene.Fluorescent in situ hybridization(FISH)confirmed a single copy number of ch1 and chi2(hemizygous)on chromosome no.6.Furthermore,the efficacy of transgenes on whitefly was evaluated through an insect bioassay,where after 96 h of infestation,mortality rates of whitefly were calculated to be 78%–80%in transgenic cotton plants.The number of eggs on transgenic cotton plants were calculated to be 0.1%–0.12 per plant compared with the non-transgenic plants where egg number was calculated to be 0.90–1.00 per plant.Conclusion Based on these findings,it can be concluded that the chemically synthesized barley chitinase genes(ch1 and chi2)have the potential to be effective against insects with chitin exoskeletons,including whiteflies.The transgenic cotton plants expressing these genes showed increased resistance to whiteflies,resulting in reduced egg numbers and higher mortality rates.