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Weed and insect control affected by mixing insecticides with glyphosate in cotton

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Journal of Integrative Agriculture 2016年第2期15卷 373-380页

作者： ma Xiao-yan WU Han-wen JIANg Wei-li ma Ya-jie ma Yan State Key Laboratory of Cotton Biology Institute of Cotton ResearchChinese Academy of Agricultural Sciences Wagga Wagga Agricultural Institute NSW Department of Primary Industries

Field studies were conducted in 2012 and 2013 to evaluate weed and insect control efficacy with glyphosate at 1 230 g ai（active ingredient） ha^（-1） and the insecticides acephate（728 g ai ha^（-1））,carbosulfan（135 g ai ha^（-1））,endosulfan（683 g ai ha^（-1））,imidacloprid（32 g ai ha^（-1））,or lambda-cyhalothrin（23 g ai ha^（-1））,as well as glyphosate tank-mixed with these *** of the most common weeds in cotton,common purslane,false daisy,goosegrass,and lambsquarters,were manually sown in the cotton field and treated with glyphosate alone or in combination with *** efficacy,based on visual estimates of control and weed fresh weight at 21 d after treatment（DAT）,was unaffected by the addition of *** weeds were controlled by 93-97%and 86-100%（visual rating） and reduced weed fresh biomass by98-99%and 96-100%with glyphosate alone and its combination with insecticides,*** of glyphosate to acephate improved cotton aphid control compared with acephate ***,addition of glyphosate to carbosulfan,endosulfan,imidacloprid,or lambda-cyhalothrin did not affect the aphid control when compared with the insecticide alone *** results indicate that cotton producers could potentially integrate weed and insect management strategies by choosing suitable insecticide mixing partners with glyphosate,thereby reducing the application costs without sacrificing the efficacy of the glyphosate or the insecticides.

关键词： aphid control efficacy glyphosate-resistant cotton herbicide-insecticide combinations weed

goosegrass (Eleusine indica) density effects on cotton (gossypium hirsutum)

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Journal of Integrative Agriculture 2015年第9期14卷 1778-1785页

goosegrass is one of the worst agricultural weeds on a worldwide basis. Understanding of its interference impact in crop ifeld wil provide useful information for weed control programs. Field experiments were conducted during 2010–2012 to determine the inlfuence of goosegrass density on cotton growth at the weed densities of 0, 0.125, 0.25, 0.5, 1, 2, and 4 plants m–1 of row. Seed cotton yield tended to decrease with the increase in weed density, and goosegrass at a density of 4 plants m–1 of row signiifcantly reduced cotton yields by 20 to 27%. A density of 11.6–19.2 goosegrass plant m–1 of row would result in a 50%cotton yield loss from the maximum yield according to the hyperbolic decay regression model. Bol production was not affected in the early growing season. But bol numbers per plant were reduced about 25%at the den-sity of 4 plants m–1 of row in the late growing season. Both cotton bol weight and seed numbers per bol were signiifcantly reduced (8%) at 4 goosegrass plants m–1 of row. Cotton plant height, stem diameter and sympodial branch number were not affected as much as cotton yields by goosegrass competition. Seed index, lint percentage and lint ifber properties were unaffected by weed competition. Intraspeciifc competition resulted in density-dependent effects on weed biomass per plant, 142–387 g dry weight by harvest. goosegrass biomass m–2 tended to increase with increasing weed density as indicated by a quadratic response. The adverse impact of goosegrass on cotton yield identiifed in this study has indicated the need of effective goosegrass management.

关键词： competition goosegrass cotton yield fiber properties weed biomass

Asymptotic Performance Limits of Vehicular Location and Velocity Detection Towards 6g mmWave Integrated Communication and Sensing

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China Communications 2023年第9期20卷 1-19页

作者： Shanshan ma Bingpeng Zhou The School of Electronics and Communication Engineering Sun Yat-sen UniversityShenzhen 518107China

In this paper,joint location and velocity estimation(JLVE)of vehicular terminals for 6g integrated communication and sensing(ICAS)is *** aim to provide a unified performance analysis framework for ICAS-based JLVE,which is challenging due to random fading,multipath interference,and complexly coupled system models,and thus the impact of channel fading and multipath interference on JLVE performance is not fully *** address this challenge,we exploit structured information models of the JLVE problem to render tractable performance ***,an individual closedform Cramer-Rao lower bound for vehicular localization,velocity detection and channel estimation,respectively,is established for gaining insights into performance limits of ICAS-based ***,the impact of system resource factors and fading environments,e.g.,system bandwidth,the number of subcarriers,carrier frequency,antenna array size,transmission distance,spatial channel correlation,channel covariance,the number of interference paths and noise power,on the JLVE performance is theoretically *** associated closed-form JLVE performance analysis can not only provide theoretical foundations for ICAS receiver design but also provide a perfor mance benchmark for various JLVE methods。

关键词： integrated sensing and communication vehicular state sensing Cramer-Rao lower bound

Dynamic genetic analysis for body weight and main length ratio in turbot Scophthalmus maximus

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Acta Oceanologica Sinica 2020年第2期39卷 22-27页

作者： Xin’an Wang Aijun ma Yellow Sea Fisheries Research Institute Chinese Academy of Fishery Sciences/Shandong Province Key Laboratory of Marines Fisheries Biotechnology and Genetic BreedingQingdao 266071China Laboratory for marine Biology and Biotechnology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China

The objective of this study was to estimate genetic parameters of body width(BW)to body length(BL)ratio(BW/BL)and of body weight traits(BWT)in turbot,and to elucidate the genetic mechanism of the two traits during ontogeny by dynamic genetic *** 3 to 27 months,BW,BL and BWT of each communally stocked fish were measured every 3 *** BW/BL ratio was measured at different sampling ages.A twotrait animal model was used for genetic evaluation of *** results showed that the heritability values of BW/BL ratio ranged from 0.2168 to 0.3148,corresponding to moderate *** BWT heritability values ranged from 0.2702 to 0.3479 corresponding to moderate *** heritability of BW/BL ratio was lower than that of BWT,except at 3 months of *** correlation between BW/BL ratio and BWT decreased throughout the measurement *** correlations were higher than the phenotypic *** current results for estimating genetic parameters demonstrate that the BW/BL ratio could be used as a phenotypic marker of fast-growing turbot,and the BW/BL ratio and BWT could be improved simultaneously through selective breeding.

关键词： turbot dynamic genetic analysis body weight main length ratio heritability genetic correlation

Denitrifying phosphorus removal in a step-feed CAST with alternating anoxic-oxic operational strategy

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Journal of Environmental Sciences 2009年第9期21卷 1169-1174页

作者： ma Juan PENg Yongzhen WANg Shuying WANg Li LIU Yangt ma Ningpin Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering College of Environmental and Energy Engineering Beijing University of Technology Beijing 100124 China. China Water Holdings Private Limited 28 Kaki Bukit Crescent Kaki Bukit Techpark I S416259 416259 Singpore.

A bench-scale cyclic activated sludge technology （CAST） was operated to study the biological phosphorus removal performance and a series of batch tests was carried out to demonstrate the accumulation of denitrifying polyphosphate-accumulating organisms （DNPAOs） in CAST system. Under all operating conditions, step-feed CAST with enough carbon sources in influent had the highest nitrogen and phosphorus removal efficiency as well as good sludge settling performance. The average removal rate of COD, NH4^＋-N, PO4^3--P and total nitrogen （TN） was 88.2%, 98.7%, 97.5% and 92.1%, respectively. The average sludge volume index （SVI） was 133 mL/g. The optimum anaerobic/aerobic/anoxic （AOA） conditions for the cultivation of DNPAOs could be achieved by alternating anoxic/oxic operational strategy, thus a significant denitrifying phosphorus removal occurred in step-feed CAST. The denitrification of NO^x--N completed quickly due to step-feed operation and enough carbon sources, which could enhance phosphorus release and further phosphorus uptake capability of the system. Batch tests also proved that polyphosphate-accumulating organisms （PAOs） in the step-feed process had strong denitrifying phosphorus removal capacity. Both nitrate and nitrite could be used as electron acceptors in denitrifying phosphorus removal. Low COD supply with step-feed operation strategy would favor DNPAOs accumulation.

关键词： cyclic activated sludge technology biological phosphorus removal denitrifying polyphosphate-accumulating organisms

High Power Sige X-Band (8～10gHz) Heterojunction Bipolar Transistors and Amplifiers

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Journal of Semiconductors 2006年第2期27卷 270-275页

作者： ma Zhenqiang Wang guogong Jiang Ningyue Ponchak g E Alterovitz S A Department of Electrical and Computer Engineering University of Wisconsin-Madison Madison WI 53706 USA NASA-glenn Research Center Cleveland OH 44135 USA

Limited by increased parasitics and thermal effects as device size increases, current commercial Sige power HBTs are difficult to operate at X-band （8--12gHz） frequencies with adequate power added efficiencies at high power levels. We find that, by changing the heterostructure and doping profile of Sige HBTs, their power gain can be significantly improved without resorting to substantial lateral scaling. Furthermore,employing a common-base configuration with a proper doping profile instead of a common-emitter configuration improves the power gain characteristics of Sige HBTs,thus permitting these devices to be efficiently operated at X-band frequencies. In this paper,we report the results of Sige power HBTs and MMIC power amplifiers operating at 8 *** 10gHz,a 22.5dBm （178mW） RF output power with a concurrent gain of 7.32dB is measured at the peak power-added efficiency of 20.0%, and a maximum RF output power of 24.0dBm （250mW） is achieved from a 20 emitter finger Sige power HBT. The demonstration of a single-stage X-band medium-power linear MMIC power amplifier is also realized at 8gHz. Employing a 10-emitter finger Sige HBT and on-chip input and output matching passive components, a linear gain of 9.7dB, a maximum output power of 23.4dBm,and peak power add- ed efficiency of 16% are achieved from the power amplifier. The MMIC exhibits very low distortion with 3rd order intermodulation （IM） suppression C/I of -13dBc at an output power of 21,2dBm and over 20dBm 3^rd order output intercept point （OIP3）.

关键词：晶体管放大器基极发射极掺杂

Influence of Probiotics on the growth and Digestive Enzyme Activity of White Pacific Shrimp (Litopenaeus vannamei)

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Journal of Ocean University of China 2008年第2期7卷 215-218页

作者： gómez R. geovanny D. ma Shen College of Fisheries Ocean University of China College of Fisheries Ocean University of China Qingdao 266003 P. R. China

The influence of Bacillus probiotics on the digestive enzyme activity and the growth of Litopenaeus vannamei were de- termined in this study. The shrimp was treated with five percentages (1.5, 3.0, 4.5, 6.0 and 7.5) of probiotics (Bacillus spp.) supple- mented to the feed and cultured for 45 d. The growth measured as the weight gain at the end of culturing was significantly (Pgher in probiotic-treated shrimps than that of the control (without receiving probiotics). Activities of protease and amylase, two digestive enzymes of the midgut gland and the intestine were significantly (Pgher in probiotic-treated shrimp than in the control.

关键词： Bacillus digestive enzymes growth midgut gland probiotic

Paleomagnetism of late Cretaceous dykes in the gangdese belt: New constraints on the position and structure of the southern margin of Asia prior to the India-Asia collision

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China geology 2023年第2期6卷 269-284,I0001-I0003页

作者： Zhi-yu Yi Si-lin Yang Joseph g.Meert Xu-xuan ma Planetary Environmental and Astrobiological Research Laboratory(PEARL) School of Atmospheric SciencesSun Yat-sen UniversityZhuhai 519000China Key Laboratory of Tropical Atmosphere-Ocean System Ministry of EducationZhuhai 519082China Department of Earth&Planetary Sciences 112 Williamson HallUniversity of FloridaGainesvilleFL 32611USA Key Laboratory for Continental Tectonics and Dynamics Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China

This paper report paleomagnetic data from late Cretaceous diorite dykes that sub-vertically intrude granodiorites in the eastern gangdese belt near the city of *** research goals are to provide further constraints on pre-collisional structure of the southern margin of Asia and the onset of the India-Asia *** is identified as the main magnetic carrier in our *** magnetite shows no evidence of metamorphism or alteration as determined from optical and scanning electron microscope observations.A strong mineral orientation is revealed by anisotropy of magnetic susceptibility analysis both for the intruded dykes and the country *** authors interpret this AMS fabric to have formed during intrusion rather than *** of 23 sites yield acceptable site mean characteristic remanences with dual polarities.A scatter analysis of the virtual geomagnetic poles suggests that the mean result adequately averaged paleosecular *** paleomagnetic pole from the gangdese dykes yields a paleolatitude of 14.3°N±5.8°N for the southern margin of Asia near *** paleolatitude corresponds to an in-between position of the Lhasa terrane during about 130‒60 ***,the mean declination of the characteristic remanent magnetization reveals a significant counterclockwise rotation of 18°±9°for the sampling location since about 83 *** the light of tectonic setting of the dykes,the strike of the southern margin of Asia near Lhasa is restored to trend approximately about 310°,which is compatible with the hypothesis that the southern margin of Eurasia had a quasi-linear structure prior to its collision with India.

关键词： Paleomagnetism Diorite dyke granodiorite India-Asia collision Southern Tibet geological survey engineering Lhasa Terrane

NOVEL INTEgRABLE HAMILTONIAN HIERARCHIES WITH SIX POTENTIALS

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Acta mathematica Scientia 2024年第6期44卷 2498-2508页

作者： Wenxiu ma Department of mathematics Zhejiang Normal UniversityJinhua 321004China Department of mathematics King Abdulaziz UniversityJeddah 21589Saudi Arabia Department of mathematics and Statistics University of South FloridaTampaFL 33620-5700USA material Science Innovation and Modelling Department of Mathematical SciencesNorth-West UniversityMafikeng CampusMmabatho 2735South Africa

This paper aims to construct six-component integrable hierarchies from a kind of matrix spectral problems within the zero curvature *** Hamiltonian formulations are furnished by the trace identity,which guarantee the commuting property of infinitely many symmetries and conserved Hamiltonian *** examples of the resulting integrable equations of second and third orders are explicitly computed.

关键词： matrix spectral problem zero curvature equation integrable hierarchy NLS equations mKdV equations