bluuebunny/crossref_metadata_2025 huggingface dataset:
New Energetic Complex of Copper(II) Dinitramide Based Nitrogen‐rich Ligand Aminoguanidine(CH6N4): Synthesis, Structural and Energetic Properties
Authors: Nosratzadegan Keyvan , Mahdavi Mohammad , Ghani Kamal , Barati Kazem
Published: May 2019

The crystal structure of the energetic complex bis(aminoguanidine)copper(II) dinitramide [Cu(AG)2][DN]2 (I), has been determined at 298 K using single‐crystal X‐ray diffraction technique. The Cu(II) atom is four‐coordinated by two imine N atoms and two amine N atoms from two aminoguanidine ligands, forming a slightly distorted square‐planar coordination. In the crystal structure, molecules are linked through intermolecular N−H…O hydrogen bonds, forming a network. The infrared spectrum showed a sharp peaks at 1650 and 1010 cm−1 which are typical of the conjugated C=N stretching due to the coordination of the imine nitrogen and NNN stretching dinitramide counterion, respectively. The thermal decomposition process of this complex was investigated through differential scanning calorimetry (DSC) and the sensitivities toward impact and friction were assessed using a BAM drophammer and a BAM friction tester. In the measurement of I a violent explosion appeared destroying the setup. This may be a reason, due to the copper complex (I), which crystallizes water free. The power of powder and single crystal of I was measured by the Trauzl test are 425 and 427 cm−3 for 10 g I (142 % TNT and 88 % RDX).
Goos–Hänchen Shift in Single Crystal Silicon Induced by the Electro‐Optic Effects
Authors: Jiao Xinbing , Wang Zhenyu , Cai Yibo
Published: May 2019

The Goos–Hänchen shift is vital in the fields of optics and nanophotonics. In this paper, positive and negative Goos–Hänchen shifts are observed in the linearly or circularly polarized laser beams reflected from single crystal silicon, with tunable strains induced by electricity. The Goos–Hänchen shifts are analyzed by the electro‐optic effect theory. The results show that the Goos–Hänchen shifts are related to the relative positions of the incident laser beams and the direction of silicon crystallization. The maximum pressure found for an external direct current voltage acting on the single crystal silicon was 9.2 × 109 Pa.
The Alphasat Aldo Paraboni scientific and communication experiments at Ka and Q/V bands in Austria
Authors: Cuervo Felix , Martellucci Antonio , Rivera Castro Juan , Schmidt Michael , Schönhuber Michael
Published: May 2019

The use of higher frequencies for satellite multimedia communication systems calls for research of the atmospheric propagation effects at these bands (rain, cloud and gaseous attenuation, scintillation, and depolarization). Alphasat was successfully launched on 25 July 2013. This largest and most powerful European telecommunication satellite carries, besides a commercial payload belonging to the mobile satellite communication provider Inmarsat, several Technology Demonstration Payloads (TDPs) from ESA. One of them is the Aldo Paraboni payload (TDP5) for Q/V‐band communication and Ka/Q‐band propagation experiments. These experiments explore future applications in satellite communication and measure how the Earth's atmosphere affects the propagation of electromagnetic waves. Under ESA contract, JOANNEUM RESEARCH designed, developed, and operates a Q/V‐band communication ground station and a Ka/Q‐band propagation terminal. The experimental site is equipped with ancillary equipment including a multifrequency radiometer profiler, a 2D video disdrometer (2DVD), and meteorological stations. This paper reports on the experimental setup, data processing, and obtained results.
Recent Progress in Advanced Characterization Methods for Silicon‐Based Lithium‐Ion Batteries
Authors: Wu Jingkun , Ma Fei , Liu Xiaorui , Fan Xiayue , Shen Long , Wu Zhihong , Ding Xiaoyang , Han Xiaopeng , Deng Yida , Hu Wenbin , Zhong Cheng
Published: May 2019

With the remarkably large theoretical specific capacity of silicon (Si), Si‐based rechargeable lithium‐ion batteries (LIBs) have attracted great interest, as they are expected to meet the growing demand for large‐scale energy storage devices, electric vehicles, and portable electronic devices with high energy density. However, the Si‐based LIB faces great challenges due to the cyclic volume changes induced by Si, which lead to considerable capacity fading. To facilitate the use of high‐performance LIBs enabled by Si‐based anodes, understanding the fading mechanism is necessary. In this regard, various advanced characterization methods have been developed to reveal the fading mechanism and to develop a modification strategy associated with compositional and structural evolution. In this review, the general understanding of the fading mechanism and the technical specifications of Si‐based LIBs are discussed. The recent progress in advanced characterization methods for Si‐based LIBs is summarized with respect to the achievements in compositional and structural interpretation. Several possible future research directions for Si‐based LIBs and the expected development trends in relevant characterization methods are also discussed.
Atom Probe Tomography of Carbides in Fe‐Cr‐(W)‐C Steels
Authors: Gramlich Alexander R. M. , Auger Maria A. , Schneider Andre , Moody Michael P.
Published: May 2019

In this study, Fe‐Cr‐C and Fe‐Cr‐W‐C alloys are characterized using atom probe tomography. The alloys have been heat treated at 1070 °C for 30 min and subsequently at 780 °C for various time periods. Carbide formation is observed at each state. Cr‐C precipitates smaller than 5 nm in radius for short heat treatment times and larger than 50 nm for heat‐treatment times greater than 1000 s are observed. It is found that the phase interface moves during the first time period at an almost constant speed. Later on the velocity of the phase interface decreases. Furthermore, kinetic assumptions for carbide growth from a previous theoretical study have been verified. As expected, a decrease of the microhardness with increasing aging time is detected which is caused by martensite tempering. The aim of this study is to measure the change in chemical compositions across phase interfaces between matrix and precipitates to obtain a better understanding of the precipitation process.
“We Listened to Each Other”: Socioemotional Growth in Literature Circles
Authors: Venegas Elena M.
Published: May 2019

Literature circles undoubtedly foster literacy, but successful participation in literature circles requires students’ social and emotional competence. The author presents findings from a study of a fifth‐grade student who demonstrated socioemotional growth while participating in literature circles. Specifically, growth in intrapersonal and interpersonal skills such as self‐management, social awareness, social metacognition, and empathy were evident. These findings suggest that literature circles foster not only literacy but also socioemotional learning.
Exact generalized partition function of 2D CFTs at large central charge
Authors: Dymarsky Anatoly , Pavlenko Kirill
Published: May 2019

Abstract

We discuss generalized partition function of 2d CFTs on thermal cylinder decorated by higher qKdV charges. We propose that in the large central charge limit qKdV charges factorize such that generalized partition function can be rewritten in terms of auxiliary non-interacting bosons. The explicit expression for the generalized free energy is readily available in terms of the boson spectrum, which can be deduced from the conventional thermal expectation values of qKdV charges. In other words, the picture of the auxiliary non-interacting bosons allows extending thermal one-point functions to the full non-perturbative generalized partition function. We verify this conjecture for the first seven qKdV charges using recently obtained pertrubative results and find corresponding contributions to the auxiliary boson masses. We further extend these results by conjecturing the full spectrum of bosons and find an exact expression for the generalized partition function as a function of infinite tower of chemical potentials in the limit of large central charge.
A metaheuristic algorithm and structured analysis for the Line-haul Feeder Vehicle Routing Problem with Time Windows
Authors: Brandstätter Christian
Published: May 2019

Synchronisation in vehicle routing is a rather new field of research and naturally new problems arise. One of these problems is the Line-haul Feeder Vehicle Routing Problem (LFVRP). It uses a fleet of small and large vehicles to serve two types of customers. The first type provides additional parking space and can be visited by both vehicle classes. The second type can only be visited by the small vehicle class as these customers provide only limited parking space. The main characteristic of the small vehicle class is the limited capacity. To overcome this particular disadvantage, the small vehicles can use the large vehicles as virtual depots. In other words, a small and large vehicle can meet at a parking lot or at a customer with enough space (type-1 customer) and perform a transfer of goods. For a successful reloading operation, both vehicles must be present at the same place at the same time. Thus, both vehicle tours must be synchronized. After using the large vehicle as virtual depot, the small vehicle can proceed immediately afterwards because it does not need to go back to the physical depot. Consequently, less time and distance is required which results in a reduction of the overall costs. The advantage of the LFVRP over classical variants of the Vehicle Routing Problem has been shown in previous papers. Yet, customer time windows have been neglected so far and as time windows play an important role in vehicle routing research, they need to be addressed properly. Therefore, we aim to close this gap by introducing the Line-haul Feeder Vehicle Routing Problem with Time Windows (LFVRPTW). We discuss the complexity of customer time windows for the LFVRPTW and adopt the previously introduced algorithm for the LFVRP. Furthermore, we provide a thorough computational analysis on the impact of different time window characteristics and show the advantage of the LFVRPTW over other variants of the Vehicle Routing Problem with Time Windows.
The Influence of Segregation of Mn on the Recrystallization Behavior of C-Mn Steels
Authors: Slater C. , Mandal A. , Davis C.
Published: May 2019

The influence of Mn segregation that occurs during casting on recrystallization kinetics has been explored for a C-Mn automotive steel. A homogenization heat treatment was used to remove Mn segregation, while maintaining a similar initial austenite grain size to the segregated condition, to provide base-line comparison data. Deformation trials were carried out in a Gleeble thermomechanical simulator to 0.3 strains at 900 °C, and significant differences in both recrystallization times and final grain sizes were seen between the two conditions. The segregated sample incurred a longer recrystallization time and a wider recrystallized grain size distribution than the homogenized sample. A finite element model was used to predict the local deformation strains based on variations in material properties caused by segregation; the model used data from XRF elemental mapping of Mn to define the local mechanical properties based on differences in solid solution strengthening. Local strain variations ranging from 0.19 to 0.49 were predicted in the segregated sample for an overall applied 0.3 strain (compared to 0.26 to 0.35 in the homogenized sample); using these strains to predict the recrystallized grain sizes gave a much better prediction for the grain size distribution.
Identity of attached eddies in turbulent channel flows with bidimensional empirical mode decomposition
Authors: Cheng Cheng , Li Weipeng , Lozano-Durán Adrián , Liu Hong
Published: May 2019

Bidimensional empirical mode decomposition (BEMD) is used to identify attached eddies in turbulent channel flows and quantify their relationship with the mean skin-friction drag generation. BEMD is an adaptive, non-intrusive, data-driven method for mode decomposition of multiscale signals especially suitable for non-stationary and nonlinear processes such as those encountered in turbulent flows. In the present study, we decompose the velocity fluctuations obtained by direct numerical simulation of channel flows into BEMD modes characterized by specific length scales. Unlike previous works (e.g. Flores & Jiménez, Phys. Fluids, vol. 22(7), 2010, 071704; Hwang, J. Fluid Mech., vol. 767, 2015, pp. 254–289), the current approach employs naturally evolving wall-bounded turbulence without modifications of the Navier–Stokes equations to maintain the inherent turbulent dynamics, and minimize artificial numerical enforcement or truncation. We show that modes identified by BEMD exhibit a self-similar behaviour, and that single attached eddies are mainly composed of streaky structures carrying intense streamwise velocity fluctuations and vortex packets permeating in all velocity components. Our findings are consistent with the existence of attached eddies in actual wall-bounded flows, and show that BEMD modes are tenable candidates to represent Townsend attached eddies. Finally, we evaluate the turbulent-drag generation from the perspective of attached eddies with the aid of the Fukagata–Iwamoto–Kasagi identity (Fukagata et al., Phys. Fluids, vol. 14(11), 2002, pp. L73–L76) by splitting the Reynolds shear stress into four different terms related to the length scale of the attached eddies.
Stress relaxation in a dilute bacterial suspension: the active–passive transition
Authors: Nambiar Sankalp , S. Phanikanth , Nott P. R. , Subramanian Ganesh
Published: May 2019

This paper follows a recent article of Nambiar et al. (J. Fluid Mech., vol. 812, 2017, pp. 41–64) on the linear rheological response of a dilute bacterial suspension (e.g. E. coli) to impulsive starting and stopping of simple shear flow. Here, we analyse the time dependent nonlinear rheology for a pair of linear flows – simple shear (a canonical weak flow) and uniaxial extension (a canonical strong flow), again in response to impulsive initiation and cessation. The rheology is governed by the bacterium orientation distribution which satisfies a kinetic equation that includes rotation by the imposed flow, and relaxation to isotropy via rotary diffusion and tumbling. The relevant dimensionless parameters are the Péclet number $Pe\equiv \dot{\unicode[STIX]{x1D6FE}}\unicode[STIX]{x1D70F}$, which dictates the importance of flow-induced orientation anisotropy, and $\unicode[STIX]{x1D70F}D_{r}$, which quantifies the relative importance of the two intrinsic orientation decorrelation mechanisms (tumbling and rotary diffusion). Here, $\unicode[STIX]{x1D70F}$ is the mean run duration of a bacterium that exhibits a run-and-tumble dynamics, $D_{r}$ is the intrinsic rotary diffusivity of the bacterium and $\dot{\unicode[STIX]{x1D6FE}}$ is the characteristic magnitude of the imposed velocity gradient. The solution of the kinetic equation is obtained numerically using a spectral Galerkin method, that yields the rheological properties (the shear viscosity, the first and second normal stress differences for simple shear, and the extensional viscosity for uniaxial extension) over the entire range of $Pe$. For simple shear, we find that the stress relaxation predicted by our analysis at small $Pe$ is in good agreement with the experimental observations of Lopez et al. (Phys. Rev. Lett., vol. 115, 2015, 028301). However, the analysis at large $Pe$ yields relaxations that are qualitatively different. Upon step initiation of shear, the rheological response in the experiments corresponds to a transition from a nearly isotropic suspension of active swimmers at small $Pe$, to an apparently (nearly) isotropic suspension of passive rods at large $Pe$. In contrast, the computations yield the expected transition to a nearly flow-aligned suspension of passive rigid rods at high $Pe$. We probe this active–passive transition systematically, complementing the numerical solution with analytical solutions obtained from perturbation expansions about appropriate base states. Our study suggests courses for future experimental and analytical studies that will help understand relaxation phenomena in active suspensions.
Turbulence velocity spectra and intensities in the inflow of a turbine rotor
Authors: Milne I. A. , Graham J. M. R.
Published: May 2019

The changes in spectra and intensities of the streamwise component of turbulent velocity are calculated in the inflow of a turbine rotor. The flow is initially calculated in the limit when the turbulence is of small scale compared with the rotor diameter. Rapid distortion theory (RDT), Batchelor & Proudman (Q. J. Mech. Appl. Maths, vol. 7 (1), 1954, pp. 83–103) (BP), for small-scale turbulence is combined with the effect of the fluctuating potential flow field on the turbulence caused by the direct interaction of the incident turbulence with the rotor as a sheet of resistance. A second computation is then carried out for turbulence of larger length scale. The results of the calculations are compared with velocity measurements in the inflow of both a commercial wind turbine and a tidal turbine rotor.
Psychosocial safety climate, safety compliance and safety participation: The mediating role of psychological distress
Authors: Mirza Muhammad Zeeshan , Isha Ahmad Shahrul Nizam , Memon Mumtaz Ali , Azeem Sundas , Zahid Muhammad
Published: May 2019

We conceptualize that psychosocial safety climate (PSC) has a positive effect on employees' safety behavior by reducing their psychological distress. A high-level PSC environment reduces psychological distress by eliminating the employees' need for devoting psychological resources toward safety concerns. This preserves psychological resources to be invested in important behaviors i.e., safety compliance and participation. Data were collected from 190 production workers in the oil and gas industry across three states of Malaysia. Results showed strong support for our hypotheses. PSC was negatively linked with psychological distress. Psychological distress predicted safety compliance and participation and mediated the relationship between PSC and safety compliance/participation. Results suggest that in order to improve safety compliance and participation, management in safety-sensitive industries should pay attention to psychosocial factors in the work environment. The implications of these results for safety interventions and further research are discussed.
Investigating (a)symmetry in a small mammal's response to warming and cooling events across western North America over the late Quaternary
Authors: Balk Meghan A. , Betancourt Julio L. , Smith Felisa A.
Published: May 2019

Many mammalian populations conform spatially and temporally to Bergmann's rule. This ecogeographic pattern is driven by selection for larger body masses by cooler temperatures and smaller ones by warming temperatures. However, it is unclear whether the response to warming or cooling temperatures is (a)symmetrical. Studies of the evolutionary record suggest that mammals evolve smaller body sizes more rapidly than larger ones, suggesting that it may be “easier” to adapt to warming climates than cooling ones. Here, we examine the potential asymmetrical response of mammals to past temperature fluctuations. We use the fossil midden record of the bushy-tailed woodrat,Neotoma cinerea, a well-studied animal that generally conforms to Bergmann's rule, to test the ability of populations to respond to warming versus cooling climate throughout its modern range in western North America over the late Quaternary. We quantified the response to temperature change, as characterized by the Greenland Ice Sheet Project 2 temperature record, usingN. cinereapresence/absence and “darwins.” Our results show that populations within the modern range ofN. cinereashow little difference between warming and cooling events. However, northern, peripheral populations are absent during older, cooler periods, possibly due to climate or taphonomy. Our study suggests adaptation in situ may be an underestimated response to future climate change.
Decadal- to centennial-scale climate changes over the last 2000 yr recorded from varved sediments of Lake Kusai, northern Qinghai-Tibetan Plateau
Authors: Jia Weihan , Liu Xingqi
Published: May 2019

High-resolution climate archives of the Late Holocene are essential in the study of paleoclimatic dynamics and for understanding the importance of natural and anthropogenic influences on past and future climate changes. Here, we present well-dated X-ray fluorescence scanning records retrieved from a varved sediment core from Lake Kusai. These records show the decadal- to centennial-scale paleoclimatic variability of the northern Qinghai-Tibetan Plateau over the last 2000 yr. Ca is mainly related to the precipitation of authigenic carbonates and is a proxy for temperature changes. The Ca record of Lake Kusai is well-correlated with the variations and periodicities of solar activity. Therefore, solar output can be suggested as being the predominant forcing mechanism of decadal- to centennial-scale temperature fluctuations over the last 2000 yr. The evolution of effective moisture was inferred from the log-ratios of Rb/Sr, which demonstrated synchronous changes with the typical Indian summer monsoon record from Dongge Cave. These results indicate that the decadal- to centennial-scale effective moisture evolution of the northern Qinghai-Tibetan Plateau is mainly influenced by the Indian summer monsoon. Additionally, we have not found the evident periodicities of solar activity in our effective moisture record over the last 2000 yr.
Lessons from the Dying: The Role of Deuteronomy 32 in its Narrative Setting
Authors: Weitzman Steven
Published: May 2019

If one can trust the testimony of modern biblical scholarship, the Song of Moses in Deuteronomy 32 is leading a double life. According to some, Deuteronomy 32 represents a lawsuit in which God summons witnesses to the stand (Deut 32:1), issues a formal indictment (Deut 32:15–18), takes an oath (Deut 32:40), and, finally, pronounces punishment (Deut 32:19–29). For others, Deuteronomy 32 represents a wisdom text that identifies itself as a teaching (Deut 32:2), chastises Israel for its intellectual shortcomings (Deut 32:6, 28), and repeatedly exhorts Israel to remember and understand (Deut 32:7, 29). Thus Deuteronomy 32 seems to have two literary identities: one as an act of indictment drawing on legal language; the other as an act of instruction belonging to the sphere of wisdom.
Self-Cognizing Intellect and Negative Attributes in Maimonides' Theology
Authors: Kasher Hannah
Published: May 2019

In his introductory essay on the philosophical sources of The Guide of the Perplexed, Shlomo Pines points out a well-known contradiction between two conceptions of God in Maimonides' theology. On the one hand, Maimonides borrowed the Aristotelian definition of God as the intellect that cognizes itself; on the other, in line with Avicenna's Neoplatonic theory of attributes, Maimonides denied the possibility of saying anything positive about God. Pines proposes two possible solutions; first, that Maimonides was well aware of the contradiction, or, second, that he fell into the contradiction inadvertently. As Pines himself admits, however, neither solution is satisfactory.
Bishops and Politics in the Reign of Edward II: Hamo de Hethe, Henry Wharton, and the ‘Historia Roffensis’
Authors: Haines Roy Martin
Published: May 2019

It was a commonplace of the times, featured in royal letters despatched abroad, and of course in the chronicles, that during the reign of Edward II the ‘indiscretum regimen’ of bishops coupled with their ‘taciturnitas’ lay at the root of the manifest political troubles.

In 1944 Kathleen Edwards produced two articles on Edward II's bishops, relating respectively to their ‘learning’ and to their ‘political importance’. Fifteen years later, she treated another aspect of the topic, their ‘social origins and provenance’. These articles, based on her 1937 London MA thesis, provide the point of departure for further study, in particular for any prosopographical analysis. However, apart from transcripts of parliamentary proxies (PRO, SC 10) provided by Professor Johnstone and the briefMeditacio de Statu Prelati(BL, MS Royal 5 C. iii), ascribed to Simon de Ghent, printed sources only were used.
Moralism, Justification, and the Controversy over Methodism
Authors: Chamberlain Jeffrey S.
Published: May 2019

When asked why he objected to the preaching of George Whitefield, Parson Adams, Henry Fielding's paradigmatic parish priest in Joseph Andrews, replied that Whitefield ‘set up the detestable doctrine of faith against good works’. He went on to say that in his opinion ‘a virtuous and good Turk, or heathen, are more acceptable in the sight of their Creator than a vicious and wicked Christian, though his faith was as perfectly orthodox as St Paul's himself’. This literary anecdote illustrates the caricatures that developed in the wake of the Methodist revival: Methodists were portrayed as ‘solafideists’ and antinomians while traditional Anglicans were characterised as moralists. Both sides in the dispute felt obliged to attack the other, with the result that straw men were often set up in order to be knocked down. There were substantive differences between the Methodists and other Anglicans, but these were frequently exaggerated on both sides for the purpose of emphasising the severity of the opponent's error. And often these substantive differences were ignored altogether in favour of contrived and inflammatory charges.
Shape Analysis of Frasnian Species of the Late Devonian Conodont Genus Palmatolepis
Authors: Klapper Gilbert , Foster C. T.
Published: May 2019

Multielement taxonomy and shape analysis have led to substantial revisions in the taxonomic concepts of 13 Frasnian species of Palmatolepis, which previously have been based largely on visual discrimination of the Pa elements. Septimembrate apparatuses have been recognized in three species and diagnostic Pb elements are associated with the Pa elements of eight others. The multielement reconstructions thus derived provide the a priori classification that is tested by the canonical variate analysis of the outlines of the Pa elements. The outlines are digitized from a TV image and quantified by calculating mean tangent angles within a specified number of intervals between landmarks. The mean tangent angles for each interval are the variables used in the canonical variate analysis. In a series of comparisons limited to three species each, all 13 species separate into isolated clusters that are completely congruent with the a priori groups based, with two exceptions, on multielement taxonomy. Thus, shape analysis provides a rigorous separation of closely similar species that have been difficult to distinguish by visual discrimination of the Pa elements. Shape analysis is treated herein as an integral part of the systematic descriptions. Newly described species are P. bohemica, P. boogaardi, P. luscarensis, and P. muelleri. The new taxonomic concepts lead to significant revisions in the biostratigraphic ranges of a number of species of Palmatolepis involved in the zonation and graphic correlation of the Frasnian Stage.
Maastrichtian Ammonites from the Biscay Region (France, Spain)
Authors: Ward Peter D. , Kennedy W. James
Published: May 2019

Maastrichtian sediments exposed in the Bay of Biscay region at coastal sections at Zumaya and Sopelana, northern Spain, and Hendaye and Bidart, France, yield the most diverse Upper Maastrichtian ammonite faunas yet recovered. Thirty-two species/subspecies referred to 21 genera are described, one of which,Anapachydiscus terminus, is new. The ranges of all taxa are fully documented and provide the basis for a four-fold division of the uppermost Campanian and Maastrichtian, with zones ofPseudokossmaticeras tercense(oldest),Pachydiscus (P.) epiplectus, Anapachydiscus fresvillensis, andA. terminus(youngest). This represents the most refined, and first properly documented, ammonite zonation for the Maastrichtian of western Europe, and can be directly correlated with the belemnite zonation developed for the white chalks of northern Europe. The extinction of the last ammonites, documented here, occurred at relatively high standing diversity and appears to have been sudden and catastrophic.
Hero or Villain? The evolving legacy of Shi Lang in China and Taiwan
Authors: PO RONALD C.
Published: May 2019

For over two centuries, prominent officials, literary figures, and intellectuals in China have paid special attention to the legacy of Shi Lang. Compared to many other historical figures, Shi Lang remains essential to our understanding of the cross-strait tension and the murky outlook for its future. Although the image of Shi Lang continues to mean different things to different individuals, to some degree, his significance to one particular community is also communicated to other communities. By analysing most of the previous appraisals and examinations of Shi Lang, we can reveal the historical narratives of this man as being continually under construction in a shifting and mutually reinforcing process. This article aims to examine the ways in which the legacy of Shi Lang has percolated throughout Chinese history, since the Qing dynasty, and also how it continues to function in the present day. It is fascinating to not only delineate how the story of Shi Lang has evolved as a legacy, but also to explore the rich variety of ways in which an individual or a community has adapted the narratives that make up the story of Shi Lang to suit the demands of different historical settings and perspectives.
Effect of Ammonium Sulfate on Absorption of Imazethapyr by Quackgrass (Elytrigia repens) and Maize (Zea mays) Cell Suspension Cultures
Authors: Gronwald John W. , Jourdan Scott W. , Wyse Donald L. , Somers David A. , Magnusson Mark U.
Published: May 2019

Field trials indicated that addition of ammonium sulfate to imazethapyr plus nonionic surfactant increased quackgrass control, especially at low imazethapyr rates. In greenhouse experiments, approximately twice as much imazethapyr was absorbed by quackgrass leaves when the herbicide was applied in combination with nonionic surfactant plus ammonium sulfate than when the herbicide was applied with nonionic surfactant alone. Black Mexican Sweet maize (BMS) suspension-cultured cells were used to evaluate the effects of ammonium sulfate and nonionic surfactant on cellular absorption of imazethapyr in the absence of a cuticular barrier. Imazethapyr absorption by BMS cells was diffusion-mediated, energy-dependent, and exhibited a pH optimum of approximately 3. Over the concentration range of 0.1 to 10.0 μM, the equilibrium concentration of imazethapyr in BMS cells was a linear function of the external concentration. Addition of ammonium sulfate to the external medium of BMS cells enhanced both the rate of imazethapyr uptake and medium acidification. There was a linear correlation between the ability of ammonium sulfate (0.5 to 10 mM) to promote medium acidification and imazethapyr uptake by BMS cells. The ammonium sulfate-induced stimulation of imazethapyr absorption in BMS cells was sensitive to plasma membrane adenosine triphosphatase inhibitors (sodium vanadate, diethylstilbestrol), the uncoupler carbonyl cyanide m-chlorophenylhydrazone, and energy metabolism inhibitors (sodium azide, nitrogen gas), demonstrating that this effect was dependent on ATP production and the functioning of the plasma membrane ATPase. It is hypothesized that cytoplasmic acidification in BMS cells due to ammonium assimilation stimulates the plasma membrane ATPase to pump protons across the plasma membrane which in turn acidifies the cell wall promoting cellular accumulation of imazethapyr by ion-trapping. Cell wall acidification due to ammonium assimilation may contribute to the ability of ammonium sulfate to enhance the efficacy of imazethapyr and other foliar-applied herbicides.
Characterization of Root and Shoot Development of Jointed Goatgrass (Aegilops cylindrica)
Authors: Dotray Peter A. , Young Frank L.
Published: May 2019

Greenhouse and field studies were conducted to compare root development of jointed goatgrass to winter wheat. Time of seminal root development in jointed goatgrass was similar to that of winter wheat and to root development predicted by a model. The only exception was the epiblast node roots (−1A and −1B), which developed approximately 1 phyllochron later in jointed goatgrass than in winter wheat. At crown nodes, A and B roots developed later in jointed goatgrass than in winter wheat, but development of X and Y roots at these nodes was similar for both species. First-order branching at a given root axis in jointed goatgrass roots began approximately 1 phyllochron after development of that axis, compared to 2.5 phyllochrons for winter wheat and the model. Second- and third-order branching of jointed goatgrass roots began 1 and 0.5 phyllochrons earlier than the respective branching of winter wheat roots. Leaf and tiller development followed the same pattern with time for both species. Maximum distance between crown roots was 1.5 to 3 times greater in winter wheat than in jointed goatgrass. Root length density at the 0- to 10-cm depth was less for jointed goatgrass than for winter wheat, but there were no differences at greater depths. The frequency of branching of first-order laterals was greater for jointed goatgrass than for winter wheat. In the field, the relationship of jointed goatgrass shoot development to accumulated growing degree-days was linear (R2= 0.97), with a slope and y-intercept similar to winter wheat (R2= 0.95). These data, showing slight differences in root growth and development between jointed goatgrass and winter wheat, may be used in predictive modeling to better understand the biology and ecology of each species, and may be used in conjunction with other models to establish weed threshold levels and improve selective placement of fertilizers and herbicides to benefit crop development.
Itchgrass (Rottboellia cochinchinensis) Biotypes in World Populations
Authors: Millhollon Rex W. , Burner David M.
Published: May 2019

Itchgrass biotypes from 34 countries or territories were evaluated under controlled and natural day length at Houma, LA. They could be placed in five broad groups based primarily on the effect of day length on flowering but also on general morphology and pattern of growth. The Group 1 biotypes (Argentina, Bolivia, Costa Rica, Cuba-1, Ecuador-1, Florida, Guadeloupe, Honduras-1, Louisiana-1, North Carolina, Papua New Guinea-1, Panama, Peru, Philippines-1, and Venezuela) were not affected by day lengths of 12 and 14 h (day length neutral) and flowered 35 to 57 d after germination. The Group 2 biotypes (Australia, Kenya-1, Reunion, South Africa, and Zimbabwe) also were not greatly affected by photoperiod and flowered 54 to 67 d after germination, and were taller with fewer and larger diameter culms than the Group 1 biotypes. The Group 3 biotypes (Brazil, Colombia, Jamaica, and Philippines-2) were moderately sensitive to photoperiod. They took longer to flower at 14 h than at 12 h and flowered in 63 to 95 d. The Group 4 biotypes (Cuba-2, Dominican Republic, Ecuador-2, Honduras-2, India, Louisiana-2, Malaysia, Papua New Guinea-2, Puerto Rico, Taiwan, and Thailand) were short-day plants that did not flower in the screenhouse until August or September (130 to 163 d), after the natural photoperiod had decreased to 13 h. The Group 5 biotypes (Indonesia, Kenya-2, Nigeria, Sudan, Tanzania, and Trinidad) were strict short-day plants that flowered only in September to November (167 to 226 d), after the day length had decreased to about 12 h. Most biotypes were diploids with 2n = 20 chromosomes, but some were polyploids (2n = 40 or 2n = 60). The shape of the glume tip on the pedicellate spikelet was found to be acuminate, acute, or obtuse for the biotypes with 2n = 20, 40, and 60 chromosomes, respectively, and was a reliable marker to distinguish diploids from polyploids.
Atrazine Reduces Primisulfuron Transport to Meristems of Giant Foxtail (Setaria faberi) and Velvetleaf (Abutilon theophrasti)
Authors: Hart Stephen E. , Penner Donald
Published: May 2019

Greenhouse and laboratory studies were conducted to determine the effect of atrazine on efficacy, absorption, translocation, and metabolism of primisulfuron applied to velvetleaf and giant foxtail. Efficacy of primisulfuron was reduced by 18 and 22% when applied at 20 and 40 g ai ha−1, respectively, in combination with 1.7 kg ai ha−1atrazine to velvetleaf. Efficacy of primisulfuron was reduced by 15 and 16% when applied at 30 or 60 g ai ha−1, respectively, in combination with 1.7 kg ai ha−1atrazine to giant foxtail. Foliar absorption of14C-primisulfuron by either weed species was not affected by addition of atrazine to the treatment solution. Atrazine had no effect on metabolism of14C-primisulfuron by either weed species. In the absence of atrazine, translocation of absorbed14C from primisulfuron out of treated leaves of velvetleaf and giant foxtail averaged 19 and 29%, respectively, across sampling times. These values were reduced to an average of 9 and 16% in velvetleaf and giant foxtail, respectively, when14C-primisulfuron was applied in combination with atrazine. The majority of translocated14C from primisulfuron was transported acropetally in velvetleaf and basipetally in giant foxtail. Atrazine significantly reduced14C translocation from primisulfuron to these meristematic sinks in both weed species. Reduced translocation was positively correlated with reduced control of these weeds when primisulfuron was tank mixed with atrazine.
Effects of Day and Night Temperature on Goatsrue (Galega officinalis) and Alfalfa (Medicago sativa) Growth
Authors: Patterson David T.
Published: May 2019

Goatsrue, a perennial legume, is an exotic noxious weed currently found in the United States only in Cache County, Utah. It infests irrigated pastures, alfalfa fields, and noncropland areas. In order to compare their responses to temperature, goatsrue and alfalfa were grown in artificially illuminated controlled-environment chambers in 16 day/night temperature regimes ranging from 15/4 to 36/25 C. Growth analysis was used to evaluate effects of temperature on dry matter accumulation, leaf area production, and biomass allocation. Both species grew best at day/night temperatures of 22/25, 29/ 18, and 29/25 C. Leaf appearance rates were linearly related to mean daily temperature. Goatsrue produced fewer but larger leaves and a greater total leaf area than alfalfa. Biomass partitioning to leaves was greater in goatsrue, whereas partitioning to stems was greater in alfalfa. Response of vegetative dry matter production to temperature closely paralleled response of leaf area duration in both species. Alfalfa generally had a higher net assimilation rate, but the greater leaf area duration of goatsrue resulted in greater dry matter accumulation in this species after 50 d of growth. Overall responses to temperature were similar in the two species. Thus it seems likely that goatsrue could become a much more widely distributed weed in alfalfa.
Influence of Growth Stage on Spring Barley (Hordeum vulgare) Tolerance to Chlorsulfuron
Authors: Lemerle Deirdre , Cousens Roger D.
Published: May 2019

Tolerance of barley to chlorsulfuron at various stages of crop development was studied in weed-free field and pot experiments. Five barley crops were sown between mid-May and mid-July in the field in 1988 and sprayed simultaneously with four rates of chlorsulfuron when the corresponding stages of crop development ranged from growth stage 7 (GS 7) to GS 31. Early-sown barley yielded more than late-sown barley, but percent grain yield reduction from chlorsulfuron was similar for all planting dates. In a field experiment in 1989, barley was sown at three dates (May, June, and July) and each was treated with chlorsulfuron at 0, 15, 30, and 60 g ai ha−1 at either GS 12 or GS 15. Grain yield of barley sown in May and treated with 15 g ha−1 chlorsulfuron at GS 12 was reduced 35%, compared with no effect when applied at GS 15; this yield reduction was related to spike size and number. Application of chlorsulfuron at GS 12 and GS 15 to barley sown in June caused yield reductions of 20 and 11%, respectively. In contrast, barley sown in mid-July was not affected by chlorsulfuron. Applications of chlorsulfuron at GS 12,13,14, and 15 led to reductions of 75,35,15, and 5% shoot dry matter (DM) of plants grown in pots and measured at GS 33. Root DM was more sensitive to chlorsulfuron than shoot DM. Tolerance of barley to chlorsulfuron increased with age of the plant at the time of application.
Yellow and Purple Nutsedge and Chile Peppers Host Southern Root-Knot Nematode
Authors: Schroeder Jill , Thomas Stephen H. , Murray Leigh
Published: May 2019

Yellow and purple nutsedge and southern root-knot nematode are common pests in intensively managed chile pepper production. Greenhouse studies were conducted to identify relationships among nutsedge species, chile peppers, and root-knot nematode. All practical combinations of the plant species and nematodes were grown together in pots for 14 wk. Both nutsedges and root-knot nematode reduced chile pepper height over time with no interaction. Competition from purple nutsedge or either nutsedge species plus nematodes reduced chile pepper top weight more than yellow nutsedge or nematodes alone. All pest combinations reduced chile pepper root weight. Chile pepper and nematodes individually reduced rates of shoot production, as well as top and belowground weights of yellow and purple nutsedge. Chile pepper and purple and yellow nutsedge hosted root-knot nematode host race 3. Nematode egg production was greater on chile pepper roots than on either nutsedge species. Purple nutsedge growing with chile pepper increased nematode production g−1 of chile pepper root. Purple nutsedge grown with chile pepper was the most detrimental for chile pepper growth, but most efficient for maintaining the root-knot nematode population on the least amount of root biomass. Since root-knot nematode infests yellow and purple nutsedge, and few nematicides are available for nematode control, root-knot nematode cannot be managed with crop rotation if nutsedge is not controlled.
Confidence Intervals for Area of Influence Experiments and Derived Yield Loss Estimates
Authors: Cousens Roger D. , O'Neill Michael E.
Published: May 2019

A method of calculating confidence intervals of the “area of influence” of a weed plant, and of yield losses calculated from it, was developed. In a worked example using published data, the confidence intervals of the area of influence were found to be large. Yield losses calculated from this method were less precisely estimated than those from a more traditional additive density experiment. This limited evidence suggests that to give similar precision, the area of influence experiments may need to be at least double their present size. If this is indeed the case, published statements on the space, time, and effort advantages of the area of influence design will need to be treated with caution.
Absorption, Translocation, and Metabolism of AC 263,222 in Peanut (Arachis Hypogaea), Soybean (Glycine Max), and Selected Weeds
Authors: Newsom Larry J. , Shaw David R. , Hubbard Thomas F.
Published: May 2019

The14C-AC 263,222 was foliar applied to common cocklebur, johnsongrass, peanut, sicklepod, and soybean in order to study translocation and metabolism characteristics in each species. Differential absorption of14C-AC 263,222 between species was evident 4 h after application. At 48 h after application, sicklepod and peanut absorbed more14C-AC 263,222 than johnsongrass, common cocklebur, or soybean. Translocation of14C-AC 263,222 and its metabolites out of the treated leaves increased with time for all species. The14C-AC 263,222 and its metabolites appear to be both xylem- and phloem-mobile based on patterns of movement. Absorption and translocation differences occurred between species; however, they did not appear to explain differential species response. Metabolism of14C-AC 263,222 differed greatly among species. Common cocklebur metabolized less14C-AC 263,222 than any other species 96 h after application. Johnsongrass and sicklepod metabolized 24 and 28% of the14C-AC 263,222, respectively, 96 h after application. Peanut and soybean metabolized 76 and 62%, respectively, of the14C-AC 263,222 96 h after treatment. The half-life of14C-AC 263,222 was 1.1, 2.5, 7.7, 11.6, and 34.5 d in peanut, soybean, sicklepod, johnsongrass, and common cocklebur, respectively. Differential tolerance of species appears to be directly related to the half-life of AC 263,222 in the plant.
Effect of Interspecific Interference, Light Intensity, and Soil Moisture on Soybean (Glycine max), Common Cocklebur (Xanthium strumarium), and Sicklepod (Cassia obtusifolia) Water Uptake
Authors: Jones Ronald E. , Walker Robert H.
Published: May 2019

Greenhouse and growth chamber experiments with potted plants were conducted to determine the effects of interspecific root and canopy interference, light intensity, and soil moisture on water uptake and biomass of soybean, common cocklebur, and sicklepod. Canopy interference and canopy plus root interference of soybean with common cocklebur increased soybean water uptake per plant and per unit leaf area. Root interference with soybean decreased common cocklebur water uptake per plant. Canopy interference of soybean with sicklepod increased soybean water uptake per unit leaf area, while root interference decreased uptake per plant. Combined root and canopy interference with soybean decreased water uptake per plant for sicklepod. Soybean leaf area and shoot weight were reduced by root interference with both weeds. Common cocklebur and sicklepod leaf area and shoot weight were reduced by root and canopy interference with soybeans. Only common cocklebur root weight decreased when canopies interfered and roots did not. The relationship between light intensity and water uptake per unit leaf area was linear in both years with water uptake proportional to light intensity. In 1991 water uptake response to tight was greater for common cocklebur than for sicklepod. The relationship between soil moisture level and water uptake was logarithmic. Common cocklebur water uptake was two times that of soybean or sicklepod at −2 kPa of pressure potential. In 1991 common cocklebur water uptake decreased at a greater rate than soybean or sicklepod in response to pressure potential changes from −2 to −100 kPa.
Distribution and Survival of Quackgrass (Elytrigia repens) Rhizome Buds
Authors: Lemieux Claudel , Cloutier Daniel C. , Leroux Gilles D.
Published: May 2019

An experiment was established at three sites to determine the longevity and distribution of rhizome buds of two quackgrass biotypes in the soil profile under two tillage systems (no-till or fall-plow). The experiments were established in May 1987 at sites initially free of quackgrass. Rhizome segments with three nodes were planted 2 to 5 cm deep to give an initial density of 21 buds m-2. Production of new buds was prevented in subsequent years. Rhizome bud populations were sampled every 6 mo between October 1987 and October 1989. Buds were produced until snow cover, indicating the need to control quackgrass until late fall to prevent a bud population increase. Under no-till conditions, 94% of quackgrass buds occurred in the top 10 cm of soil while 68 and 19% were found below 10 and 20 cm, respectively, in the fall-plow treatments. A control program against quackgrass should aim at keeping the majority of rhizomes in the top 10 cm in order to facilitate control by having most shoots emerging at the same time. There was no statistically significant difference in bud longevity between biotypes, sites, and tillage systems. Viability of the rhizome buds declined rapidly during the first year. In most cases it took 2 yr for the bud populations to reach extinction although 0.6% of buds of one biotype survived as long as 30 mo in one of the three sites. Therefore, a minimum of 2 yr of total control would be required to eradicate quackgrass from most locations.