Journal articles: 'Cover sequence'

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Baik, Hyungryul, Farbod Shokrieh, and Chenxi Wu. "Limits of canonical forms on towers of Riemann surfaces." Journal für die reine und angewandte Mathematik (Crelles Journal) 2020, no. 764 (July 1, 2020): 287–304. http://dx.doi.org/10.1515/crelle-2019-0007.

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AbstractWe prove a generalized version of Kazhdan’s theorem for canonical forms on Riemann surfaces. In the classical version, one starts with an ascending sequence {\{S_{n}\rightarrow S\}} of finite Galois covers of a hyperbolic Riemann surface S, converging to the universal cover. The theorem states that the sequence of forms on S inherited from the canonical forms on {S_{n}}’s converges uniformly to (a multiple of) the hyperbolic form. We prove a generalized version of this theorem, where the universal cover is replaced with any infinite Galois cover. Along the way, we also prove a Gauss–Bonnet-type theorem in the context of arbitrary infinite Galois covers.

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Drofelnik, N., J. Lamut, M. Marolt, and M. Knap. "Interaction Between Steel Melt and Refractory Materials in Tundish." Archives of Metallurgy and Materials 60, no. 1 (April 1, 2015): 269–73. http://dx.doi.org/10.1515/amm-2015-0043.

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Abstract In Štore Steel steelworks steel is casted on a three strand continuous casting machine. Lining of tundish is mainly made from a magnesia based material. Tundish cover powder is based on alumina and silica. It also contains aluminum and carbon. During casting, the composition of cover slag is constantly changing. When steel in casted in sequences the change in cover slag composition depends on the amount of CaO rich ladle slag. The composition of tundish cover slag at the end of the casting sequence lies in the area of gehlenite (2CaO·Al2O3·SiO2) in ternary phase diagram CaO·Al2O3·SiO2. The result of the reaction between melted steel, refractory material and tundish cover slag are enstatite (MgO·SiO2) and monticellite (CaO·MgO·SiO2). Merwinite (3CaO·MgO·SiO2) is formed in the end of the casting sequence because of high basicity of the gehlenite based tundish cover slag. Clogging on the inner side of submerged entry nozzles (SEN) are made of calcium aluminates (CaO·2Al2O3) and spinel (MgO, MnO)·Al2O3. Only when steel is casted in sequence composition changes in tundish cover slag and clogging occurs.

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Suknikhom, Kampol, Pattaramon Jongpradist, Surachate Chutima, and Thoatsanope Kamnerdtong. "Effects of Screw Fastening Sequence to Top Cover Loosening in Hard Disk Drive Assembly." Applied Mechanics and Materials 110-116 (October 2011): 3534–40. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.3534.

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In hard disk drive assembly process, a number of small screws around the perimeter of the top cover are used to attach the top cover to the base. When one of the screws is fastened, screw loosening at the other screw heads can frequently be observed. . This research employs a three-dimensional finite element analysis to compare the effects of three different screw tightening sequences to top cover loosening in a 3.5-inch hard disk drive assembly. The top cover deformation and the contact forces at the screw heads of the three sequences are presented and discussed. Among the three sequences, the across pattern has shown to be the most appropriate sequence in which a minimum screw loosening occurs.

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Scheepers, Marion. "Rothberger's property and partition relations." Journal of Symbolic Logic 62, no. 3 (September 1997): 976–80. http://dx.doi.org/10.2307/2275582.

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Let X be an infinite but separable metric space. An open cover of X is said to be large if for each x ϵ X the set {U ϵ : x ϵ U} is infinite. The symbol Λ denotes the collection of large open covers of X. An open cover of X is said to be an ω-cover if for each finite subset F of X there is a U ϵ such that F ⊆ U, and X is not a member of , X is said to have Rothberger's property if there is for every sequence (n : n = 1,2,3,…) of open covers of X a sequence (Un : n = 1,2,3,…) such that:(1) for each n, Un is a member of n, and(2) {Un: n = 1,2,3,…} is a cover of X.Rothberger introduced this property in his paper [2]. For convenience we let denote the collection of all open covers of X.In [3] it was shown that X has Rothberger's property if, and only if, the following partition relation is true for large open covers of X:This partition relation means:for every large cover of X, for every coloringsuch that for each U ϵ and each large cover there is an i with a large cover of X,either there is a large cover such that f({A, B}) = 0 whenever {A,B} ϵ ,or else there is a which is not point–finite such that f{{A, B}) = 1 whenever {A, B} ϵ .

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Kelley, William Terry, and David L. Coffey. "SEQUENTIAL VEGETABLE CROPPING UNDER VARIOUS TILLAGE SYSTEMS." HortScience 26, no. 6 (June 1991): 710G—710. http://dx.doi.org/10.21273/hortsci.26.6.710g.

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Three cropping sequences and three tillage systems were evaluated for increasing returns on small farms under reduced tillage. The sequences were spring 'Packman' broccoli followed by 'Sunny' tomatoes, spring broccoli/tomatoes/fall broccoli, and tomatoes/fall broccoli. Each sequence was grown conventionally tilled with no winter cover, conventionally tilled with a wheat winter cover and no-till transplanted directly into killed wheat. The study was conducted at Knoxville, TN (elev. 251m, Greeneville, TN (elev. 400m) and Crossville, TN (elev. 549m) during 1989 and 1990. Experiments were arranged in a strip plot design with sequences stripped across tillage treatments. No. 1 tomato yield was reduced in no-till at Greeneville (1989). Percentage of No. 1 tomatoes was not affected by tillage but the tomato-broccoli system produced a greater percentage at Greeneville (1990). Percentage of cull fruit was greater in Knoxville (1990) for conventional/no cover. A tomato-broccoli sequence produced more cull fruit at Knoxville (1990) and Greeneville (1989). Broccoli head size and subsequent yield and value was generally greater at most environments in conventionally tilled plots. Sequence generally had little affect on broccoli production.

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STEVENS, WAYNE H. "RECURSION FORMULAS FOR SOME ABELIAN KNOT INVARIANTS." Journal of Knot Theory and Its Ramifications 09, no. 03 (May 2000): 413–22. http://dx.doi.org/10.1142/s0218216500000190.

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Let K be a tame knot in S3. We show that the sequence of cyclic resultants of the Alexander polynomial of K satisfies a linear recursion formula with integral coefficients. This means that the orders of the first homology groups of the branched cyclic covers of K can be computed recursively. We further establish the existence of a recursion formula that generates sequences which contain the square roots of the orders for the odd-fold covers that contain the square roots of the orders for the even-fold covers quotiented by the order for the two-fold cover. (That these square roots are all integers follows from a theorem of Plans.)

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WONG, W. ERIC, and YU LEI. "REACHABILITY GRAPH-BASED TEST SEQUENCE GENERATION FOR CONCURRENT PROGRAMS." International Journal of Software Engineering and Knowledge Engineering 18, no. 06 (September 2008): 803–22. http://dx.doi.org/10.1142/s0218194008003878.

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One common approach to test sequence generation for structurally testing concurrent programs involves constructing a reachability graph (RG) and selecting a set of paths from the graph to satisfy some coverage criterion. It is often suggested that test sequence generation methods for testing sequential programs based on a control flow graph (CFG) can also be used to select paths from an RG for testing concurrent programs. However, there is a major difference between these two, as the former suffers from a feasibility problem (i.e., some paths in a CFG may not be feasible at run-time) and the latter does not. As a result, even though test sequence generation methods for sequential programs can be applied to concurrent programs, they may not be efficient. We propose four methods — two based on hot spot prioritization and two based on topological sort — to effectively generate a small set of test sequences that covers all the nodes in an RG. The same methods are also applied to the corresponding dual graph for generating test sequences to cover all the edges. A case study was conducted to demonstrate the use of our methods.

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Durán-Meza, G., J. López-García, and J. L. del Río-Correa. "The self-similarity properties and multifractal analysis of DNA sequences." Applied Mathematics and Nonlinear Sciences 4, no. 1 (June 29, 2019): 267–78. http://dx.doi.org/10.2478/amns.2019.1.00023.

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AbstractIn this work is presented a pedagogical point of view of multifractal analysis deoxyribonucleic acid (DNA) sequences is presented. The DNA sequences are formed by 4 nucleotides (adenine, cytosine, guanine, and tymine). Following Jeffrey’s paper we associated a simple contractive function to each nucleotide, and constructed the Hutchinson’s operator W, which was used to build covers of different sizes of the unitary square Q, thus Wk(Q) is a cover of Q, conformed by 4k squares Qk of size 2−k, as each Qk corresponds to a unique subsequence of nucleotides with length k : b1b2...bk. Besides, it is obtained the optimal cover Ck to the fractal F generated for each DNA sequence was obtained. We made a multifractal decomposition of Ck in terms of the sets Jα conformed by the Qk’s with the same value of the Holder exponent α, and determined f (α), the Hausdorff dimension of Jα, using the curdling theorem.

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Alsatami, Khalid A., Hong-Jian Lai, and Xindong Zhang. "Dicycle Cover of Hamiltonian Oriented Graphs." Journal of Discrete Mathematics 2016 (February 3, 2016): 1–5. http://dx.doi.org/10.1155/2016/7942192.

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A dicycle cover of a digraph D is a family F of dicycles of D such that each arc of D lies in at least one dicycle in F. We investigate the problem of determining the upper bounds for the minimum number of dicycles which cover all arcs in a strong digraph. Best possible upper bounds of dicycle covers are obtained in a number of classes of digraphs including strong tournaments, Hamiltonian oriented graphs, Hamiltonian oriented complete bipartite graphs, and families of possibly non-Hamiltonian digraphs obtained from these digraphs via a sequence of 2-sum operations.

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Rosenfeld, Jeffrey A., and Christopher E. Mason. "Pervasive sequence patents cover the entire human genome." Genome Medicine 5, no. 3 (2013): 27. http://dx.doi.org/10.1186/gm431.

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Shekinah, D. Esther, and James K. Stute. "Synergy and/or Antagonism in a Cover Crop Sequence: Rotational Effects on Rye in the Midwest." Sustainable Agriculture Research 8, no. 2 (April 10, 2019): 90. http://dx.doi.org/10.5539/sar.v8n2p90.

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Cover cropping reduces soil erosion mainly by providing cover when the soil is left barren after a short season crop. It also improves nutrient cycling and prevents the loss of NO3-N by leaching especially during late fall and early spring season. When CCs are grown in a sequence, they are able to harvest both the benefits mentioned above and provide ecological services. However, there may be synergistic or antagonistic effects in action between CCs just as is the case of CC allelopathy in weed control. Field experiments were conducted over two cropping seasons (2016-16 and 2016-17) at Michael Fields Agricultural Institute, Wisconsin on a forest derived Fox silt loam (Fine-loamy, mixed, mesic Typic Hapludalfs) under organic certification to determine the effect of sequential planting of CCs on Above Ground Biomass (AGB) yield, N and C addition and to determine the synergistic or antagonistic effect of the species grown in a sequence on each other. Ten different species of CCs were planted immediately after crop harvest in early August followed by winter rye in a sequence, after roll-crimping of the first cover. The cropping sequences significantly affected the cover crop yield and related parameters. Radish – winter rye sequence was the best performing one in both years of study with regard to the AGB yield (13.96 and 14.87 Mg ha-1 respectively), and large amounts of N and C added to the soil. Phacelia – winter rye followed close, with the sequence recording on par yields in 2015-16 (13.28 Mg ha-1). Winter rye performed better following a dicot compared to monocot; non-legume compared to a legume. The CC sequences also exhibited synergism and antagonism. The yield of winter rye was boosted when the biomass yield of the forage radish it followed increased, which we consider as synergy: while the yield of winter rye reduced whenever the yield of oat, barley or beseem clover it followed increased, which we consider as an antagonistic effect. The other CCs performed moderately and were greatly a reflection of the prevailing weather conditions. More research along this line is recommended to generate research based information on synergy and antagonism in CC sequence.

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Li, Shuchao, and Shujing Wang. "Extremal cover cost and reverse cover cost of trees with given segment sequence." Discrete Mathematics 343, no. 4 (April 2020): 111791. http://dx.doi.org/10.1016/j.disc.2019.111791.

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13

Kabailienė, Meilutė, Giedrė Vaikutienė, Lina Macijauskaitė, Eugenija Rudnickaitė, Rimantė Guobytė, Dalia Kisielienė, Gražyna Gryguc, Jonas Mažeika, Petras Šinkūnas, and Gediminas Motuza. "Lateglacial and Holocene environmental change in the area of Samogitian Upland (NW Lithuania): records from Lopaičiai and Pakastuva sites." Baltica 28, no. 2 (December 11, 2015): 163–78. http://dx.doi.org/10.5200/baltica.2015.28.14.

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Pollen, plant macrofossil and carbonate analyses supplemented with 14C dating were applied for Lopaičiai hollow and Pakastuva Lake sediment sequences. The new data obtained from two sediment cores were used to reconstruct vegetation cover and environmental changes during Lateglacial and Holocene in Samogitian Upland (NW Lithuania). Different burial conditions of dead ice blocks caused different time of lake sediment start in studied sites. The depositional and vegetation cover history is traced starting at pre-Allerød time in sediment sequence from Lopaičiai core. However, sediment sequence from Pakastuva core provides paleoenvironmental information starting only from the very beginning of Holocene. The study results bring more light on environmental development during Lateglacial and Holocene of specific ice marginal area, which is interlobate insular upland.

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Amatya, Bhaba. "DNA Barcoding of Cyprinid Fish Chagunius chagunio Hamilton,1822 from Phewa Lake, Nepal." International Journal of Biology 11, no. 4 (September 28, 2019): 88. http://dx.doi.org/10.5539/ijb.v11n4p88.

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The present study is the first of its type that uses a technique of DNA barcoding to determine identification and relationship of a species of fish from Phewa lake, Nepal. The mitochondrial DNA from two ethanol-preserved samples of fish, randomly collected from Phewa lake, was extracted using Gene AllExgene TMtissue extraction kit. 650 base pair of mitochondrial cytochrome c oxidase subunit 1 (CO1) was amplified using a cocktail of four primers and was sequenced bidirectionaly using Sanger sequence method. The DNA sequences were edited using AliView software. The sequences confirmed Chagunius chagunio as their alignment with 16 reference sequences belonging to Chagunius chagunio in the NCBI GenBank, scored highest percentage of Query Cover (75% to 100%) and Percentage Identity (97.29% to 100%). The MEGA software analysed the DNA sequences to obtain their corresponding protein sequences. The DNA sequences were submitted to the GenBank and accession numbers (MN087472 and MN087473) were obtained. Clustal Omega software analysed multiple sequence alignment among 19 homologous DNA sequences of Chagunius chagunio from India, Bangladesh and Phewa lake, Nepal. The percentage of similarity among the aligned sequences was calculated as 39.3%. Based on the neighbour joining tree, the Chagunius chagunio of Phewa lake is found closely related with Chagunius chagunio of Bangladesh.

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Kelley, William Terry, and David L. Coffey. "SEQUENTIAL CROPPING IN VEGETABLE AND TOBACCO PRODUCTION SYSTEMS UNDER VARIOUS TILLAGES." HortScience 27, no. 11 (November 1992): 1172b—1172. http://dx.doi.org/10.21273/hortsci.27.11.1172b.

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Three cropping sequences and three tillage systems were evaluated under reduced tillage. Sequences were spring `Packman' broccoli followed by `Sunny' tomatoes or 'm.s. Ky 14 × L8 tobacco, spring broccoli/tomatoes or tobacco/fall broccoli, and tomatoes or tobacco/fall broccoli. Each sequence was grown conventionally tilled/no winter cover, conventionally tilled/wheat winter cover and no-till transplanted directly into killed wheat. The study was conducted at Knoxville, (elev. 251m), Greeneville, (elev. 400m) and Crossville, (elev. 549m) during 1989 and 1990. Experiments were arranged in a strip-plot design with sequences stripped across tillages. No. 1 tomato yield was reduced in no-till at Greeneville (1989). Percentage of No. 1 tomatoes was not affected by tillage but the tomato-broccoli system produced a greater percentage at Greeneville (1990). Broccoli head size and subsequent yield was generally greater in conventionally tilled plots. Sequence generally had little affect on broccoli production. Yield and revenue of tobacco were generally lower in no-till treatments. Broccoli/tobacco sequences generally had the highest yield but varied by location. No-till produced lower quality tobacco both years at Knoxville but not at Greeneville.

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Schwenk, Michael A., Patrick Schläfli, Dimitri Bandou, Natacha Gribenski, Guilhem A. Douillet, and Fritz Schlunegger. "From glacial erosion to basin overfill: a 240 m-thick overdeepening–fill sequence in Bern, Switzerland." Scientific Drilling 30 (February 25, 2022): 17–42. http://dx.doi.org/10.5194/sd-30-17-2022.

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Abstract. We drilled a 210 m-thick succession of Quaternary sediments and extended it 30 m upsection with information that we collected from an adjacent outcrop. In the 240 m-thick succession we identified 12 different lithofacies, grouped them into five facies assemblages, and distinguished two major sedimentary sequences. A sharp contact at 103 m depth cuts off cross-beds in sequence A and separates them from the overlying horizontal beds in sequence B. Although the lowermost facies assemblage of each sequence includes a till deposited during a period of ice cover, the two tills differ from each other. In particular, the till at the base of sequence A is dominated by large clasts derived from the underlying Molasse bedrock, whereas the till at the base of sequence B has no such Molasse components. Furthermore, the till in sequence A bears evidence of glaciotectonic deformation. Both tills are overlain by thick assemblages of subaqueous, most likely glaciolacustrine and lacustrine facies elements. The cross-bedded and steeply inclined sand, gravel, and diamictic beds of sequence A are interpreted as deposits of density currents in a subaqueous ice-contact fan system within a proglacial lake. In contrast, the lacustrine sediments in sequence B are considered to record a less energetic environment where the material was most likely deposited in a prodelta setting that gradually developed into a delta plain. Towards the top, sequence B evolves into a fluvial system recorded in sequence C, when large sediment fluxes of a possibly advancing glacier resulted in a widespread cover of the region by a thick gravel unit. Feldspar luminescence dating on two samples from a sand layer at the top of sequence B provided uncorrected ages of 250.3 ± 80.2 and 251.3 ± 59.8 ka. The combination of these ages with lithostratigraphic correlations of sedimentary sequences encountered in neighboring scientific drillings suggests that sequence B was deposited between Marine Isotope Stage 8 (MIS 8; 300–243 ka) and MIS 7 (243–191 ka). This depositional age marks the end of one stage of overdeepening–fill in the perialpine Aare Valley near Bern.

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Moyer, J. R., R. E. Blackshaw, E. G. Smith, and S. M. McGinn. "Cereal cover crops for weed suppression in a summer fallow-wheat cropping sequence." Canadian Journal of Plant Science 80, no. 2 (April 1, 2000): 441–49. http://dx.doi.org/10.4141/p99-099.

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Cropping systems in western Canada that include summer fallow can leave the soil exposed to erosion and require frequent weed control treatments. Cover crops have been used for soil conservation and to suppress weed growth. Experiments were conducted under rain-fed conditions at Lethbridge, Alberta to determine the effect of short-term fall rye (Secale cereale L.), winter wheat (Triticum aestivum L.) and annual rye cover crops in the fallow year on weed growth and subsequent wheat yield. Under favorable weather conditions fall rye was as effective as post-harvest plus early spring tillage or herbicides in spring weed control. Winter wheat and fall rye residues, after growth was terminated in June, reduced weed biomass in September by 50% compared to no cover crop in 1993 but had little effect on weeds in 1995. Fall-seeded cover crops reduced the density of dandelion (Taraxacum officinale Weber in Wiggers) and Canada thistle [Cirsium arvense (L.) Scop.] but increased the density of downy brome (Bromus tectorum L.), wild buckwheat (Polygonum convolvulus L.), and thyme-leaved spurge (Euphorbia serpyllifolia Pers.) in the following fall or spring. Wheat yields after fall rye and no cover crop were similar but yields after spring-seeded annual rye were less than after no cover crop. Spring-seeded annual rye did not adequately compete with weeds. Cover crops, unlike the no cover crop treatment, always left sufficient plant residue to protect the soil from erosion until the following wheat crop was seeded. Key words: Allelopathies, fall rye, nitrogen, soil conservation, soil moisture, weed control, spring rye, winter wheat

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Larkin, Denis M., Annelie Everts-van der Wind, Mark Rebeiz, Peter A. Schweitzer, Sharon Bachman, Cheryl Green, Chris L. Wright, et al. "A Cattle–Human Comparative Map Built with Cattle BAC-Ends and Human Genome Sequence." Genome Research 13, no. 8 (August 2003): 1966–72. http://dx.doi.org/10.1101/gr.1560203.

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As a step toward the goal of adding the cattle genome to those available for multispecies comparative genome analysis, 40,224 cattle BAC clones were end-sequenced, yielding 60,547 sequences (BAC end sequences, BESs) after trimming with an average read length of 515 bp. Cattle BACs were anchored to the human and mouse genome sequences by BLASTN search, revealing 29.4% and 10.1% significant hits (E < e-5), respectively. More than 60% of all cattle BES hits in both the human and mouse genomes are located within known genes. In order to confirm in silico predictions of orthology and their relative position on cattle chromosomes, 84 cattle BESs with similarity to sequences on HSA11 were mapped using a cattle–hamster radiation hybrid (RH) panel. Resulting RH maps of BTA15 and BTA29 cover ∼85% of HSA11 sequence, revealing a complex patchwork shuffling of segments not explained by a simple translocation followed by internal rearrangements. Overlay of the mouse conserved syntenies onto HSA11 revealed that segmental boundaries appear to be conserved in all three species. The BAC clone-based comparative map provides a foundation for the evolutionary analysis of mammalian karyotypes and for sequencing of the cattle genome.

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Nemenchinskaya, Ekaterina O., Yuri V. Kondratenko, and Michael G. Sadovsky. "Entropy Based Approach to Data Loss Reparation Through the Indeterminate Fine-Grained Parallel Computation." Open Systems & Information Dynamics 11, no. 02 (June 2004): 161–75. http://dx.doi.org/10.1023/b:opsy.0000034194.24443.22.

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The new method of a gap recovery in symbol sequences is presented. A covering is combined from the suitable reasonably short strings of the parts of a sequence available for observation. Two criteria are introduced to choose the best covering. It must yield the maximum of entropy of a frequency dictionary developed over the sequence obtained due to the recovery, if an overlapping combined from the copies of strings from the available parts of the sequence exists. The second criterion identifies the best covering in case when one has to use any string to cover the gap; here the best covering must yield the minimum of specific entropy of the frequency dictionary developed over the available parts of the sequence against the one developed over the entire sequence obtained due to the recovery. Kirdin kinetic machine which is the ideal finegrained structureless computer has been used to resolve the problem of the reconstruction of a gap in symbol sequence.

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Su, Ying Ying, Hai Dong, and Di Liang. "Assembly Sequence Planning Based on Connector Structure and Ant Colony Algorithm." Advanced Materials Research 712-715 (June 2013): 2482–86. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.2482.

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For the purpose of effectively reducing the degree of complexity and improving the efficiency, the method of assembly sequence planning based on connector structure and ant algorithm was proposed. The concept of connector structure was presented, which was regarded as basic assembly unit to cover features of assembly parts. Then, a model of assembly sequence planning was built, which represented the precedence constraint relationship among connector structures. Additionally, the combination of the connector structure concept and characteristics of ant colony algorithm was developed for generating optimal assembly sequences under the guidance of precedence relations in the model. Finally, an example was studied to illustrate the effectiveness of the strategy.

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Tu, Shine, Christopher Holman, Adam Mossoff, Ted Sichelman, Michael Risch, Jorge L. Conteras, Yaniv Heled, Greg Dolin, and Lee Petherbridge. "Response to ‘pervasive sequence patents cover the entire human genome’." Genome Medicine 6, no. 2 (2014): 14. http://dx.doi.org/10.1186/gm531.

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Abdullah, Mohammed, Colin Cooper, and Alan Frieze. "Cover time of a random graph with given degree sequence." Discrete Mathematics 312, no. 21 (November 2012): 3146–63. http://dx.doi.org/10.1016/j.disc.2012.07.006.

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Tiddy, Caroline, Diana Zivak, June Hill, David Giles, Jim Hodgkison, Mitchell Neumann, and Adrienne Brotodewo. "Monazite as an Exploration Tool for Iron Oxide-Copper-Gold Mineralisation in the Gawler Craton, South Australia." Minerals 11, no. 8 (July 26, 2021): 809. http://dx.doi.org/10.3390/min11080809.

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The chemistry of hydrothermal monazite from the Carrapateena and Prominent Hill iron oxide-copper-gold (IOCG) deposits in the IOCG-rich Gawler Craton, South Australia, is used here to define geochemical criteria for IOCG exploration in the Gawler Craton as follows: Monazite associated with IOCG mineralisation: La + Ce > 63 wt% (where La > 22.5 wt% and Ce > 37 wt%), Y and/or Th < 1 wt% and Nd < 12.5 wt%; Intermediate composition monazite (between background and ore-related compositions): 45 wt% < La + Ce < 63 wt%, Y and/or Th < 1 wt%. Intermediate monazite compositions preserving Nd > 12.5 wt% are considered indicative of Carrapateena-style mineralisation; Background compositions: La + Ce < 45 wt% or Y or Th > 1 wt%. Mineralisation-related monazite compositions are recognised within monazite hosted within cover sequence materials that directly overly IOCG mineralisation at Carrapateena. Similar observations have been made at Prominent Hill. Recognition of these signatures within cover sequence materials demonstrates that the geochemical signatures can survive processes of weathering, erosion, transport and redeposition into younger cover sequence materials that overlie older, mineralised basement rocks. The monazite geochemical signatures therefore have the potential to be dispersed within the cover sequence, effectively increasing the geochemical footprint of mineralisation.

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Favarato, Luiz Fernando, Rogério Carvalho Guarçoni, Frederico Jacob Eutrópio, Lidiane Mendes, and Mírian Piassi. "Growth of lettuce cultivars in beds covered with differing materials." REVISTA AGRO@MBIENTE ON-LINE 13 (July 23, 2019): 87. http://dx.doi.org/10.18227/1982-8470ragro.v13i0.5442.

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In commercial lettuce growing, the intensive cultivation of the soil results in an increase in weed populations, making it difficult to fully exploit the area and increasing production costs. Under such circumstances, the use of soil covers can minimize this problem. Consequently, the objective of this study was to evaluate the effects of different materials as soil covers on the agronomic performance of three lettuce cultivars. The experiment was arranged in randomized blocks, with treatments set in a subdivided plot scheme. Five types of soil cover (plots) were tested: no cover, black plastic, double white faced plastic, straw mulching and kraft paper and three Lettuce cultivars (subplots): loose-crested leaf group, iceberg lettuce group, with four replicates. Number of leaves per plant, stem length and diameter, head diameter, mass of fresh and total dry matter, fresh matter mass of leaves and stem were evaluated. For the Lisa and Americana lettuce groups, bed soil cover materials were more efficient when compared to the uncovered beds. For economic and environmental reasons, kraft paper is recommended as a bedding cover material for these cultivars. Variation in growth occurred between the lettuce cultivars, independently of the use of bedding cover. This occurred in the sequence: loose leaf > iceberg lettuce> loose-crested leaf group.

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Boonyarak, Thayanan, and Charles W. W. Ng. "Effects of construction sequence and cover depth on crossing-tunnel interaction." Canadian Geotechnical Journal 52, no. 7 (July 2015): 851–67. http://dx.doi.org/10.1139/cgj-2014-0235.

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An appropriate construction sequence for crossing tunnels can help minimize the adverse impact on the tunnel that is constructed first (considered as the existing tunnel). However, the influence of construction sequence on crossing-tunnel interaction is complex. Two pairs of three-dimensional centrifuge tests were carried out to investigate the effects of construction sequence on crossing-tunnel interaction. In the first pair of tests, the new tunnel was excavated beneath the existing tunnel in a reference test, while in the other test the new tunnel advanced above the existing tunnel. To study the effects of cover depth on the construction sequence, the depths of the existing and new tunnels were increased in the second pair of tests. An advanced hypoplasticity constitutive model with small-strain stiffness was adopted to back-analyze the tests. The existing tunnel was found to be vertically compressed when the new tunnel was excavated underneath, but vertically elongated when the new tunnel advanced above. This is because the reduction of stress acting on the existing tunnel in the horizontal direction was larger than in the vertical direction when the new tunnel was constructed beneath. On the other hand, the decrease in vertical stress on the existing tunnel was larger than the horizontal stress reduction when the new tunnel was excavated above. This behavior was observed in both pairs of tests, irrespective of the cover depths of the tunnels. As the cover depths of the existing and new tunnels increased, settlement of the existing tunnel due to the new tunnel construction beneath decreased. This is because with the larger cover depths of the tunnels, the increase in mobilized shear stiffness of the soil dominated the increase in stress relief caused by the tunnel excavation.

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26

Deminco, Felice, Sara N. Vaz, Daniele S. Santana, Celia Pedroso, Jean Tadeu, Andreas Stoecker, Sueli M. Vieira, Eduardo Netto, and Carlos Brites. "A Simplified Sanger Sequencing Method for Detection of Relevant SARS-CoV-2 Variants." Diagnostics 12, no. 11 (October 27, 2022): 2609. http://dx.doi.org/10.3390/diagnostics12112609.

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Molecular surveillance of the new coronavirus through new genomic sequencing technologies revealed the circulation of important variants of SARS-CoV-2. Sanger sequencing has been useful in identifying important variants of SARS-CoV-2 without the need for whole-genome sequencing. A sequencing protocol was constructed to cover a region of 1000 base pairs, from a 1120 bp product generated after a two-step RT-PCR assay in samples positive for SARS-CoV-2. Consensus sequence construction and mutation identification were performed. Of all 103 samples sequenced, 69 contained relevant variants represented by 20 BA.1, 13 delta, 22 gamma, and 14 zeta, identified between June 2020 and February 2022. All sequences found were aligned with representative sequences of the variants. Using the Sanger sequencing methodology, we were able to develop a more accessible protocol to assist viral surveillance with a more accessible platform.

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Gale, D. F., S. B. Lucas, and J. M. Dixon. "Structural relations between the polydeformed Flin Flon arc assemblage and Missi Group sedimentary rocks, Flin Flon area, Manitoba and Saskatchewan." Canadian Journal of Earth Sciences 36, no. 11 (November 10, 1999): 1901–15. http://dx.doi.org/10.1139/e99-099.

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The structure of the Flin Flon area (Manitoba and Saskatchewan) has been examined through mapping of mesoscopic and macroscopic structures in both the ca. 1900 Ma Flin Flon arc assemblage volcanic basement and the unconformably overlying (or fault juxtaposed) ca. 1845 Ma Missi Group continental sedimentary cover sequence. The Flin Flon and Callinan volcanogenic massive sulphide orebodies occur within the basalt-dominated basement. The contact between the basement and the cover rocks was investigated in detail during this study. The cover sequence records three principal fold- and foliation-forming events. All deformation observed within the cover sequence is correlative with deformation observed within the volcanic basement. Significant low-angle overlap of basement on cover is attributed to development of a D1 north-verging nappe and subsequent thrust displacement on the overturned basement-cover contact. North-verging D1 structures provide evidence for a distinct post-Missi Group deformation event that preceded regional, southwestward D2 thrusting at peak metamorphic conditions across the southeastern Trans-Hudson Orogen. D2 deformation produced closed to tight, west-verging overturned folds with a well-developed axial planar cleavage and a pervasive extension lineation. D3 deformation generated open folds of the S2 and a weakly to moderately developed spaced axial planar S3 cleavage. D3 and D4 deformations produced sinistral-oblique, brittle-ductile reverse faults that offset all older features.

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28

Wedage, W. M. M., A. H. M. N. R. Aberathne, I. N. Harischandra, and D. Gunawardana. "A Nodulation-Proficient Nonrhizobial Inhabitant of Pueraria phaseoloides." Scientific World Journal 2019 (April 1, 2019): 1–9. http://dx.doi.org/10.1155/2019/9782684.

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Pueraria phaseoloides is a legume cover crop, found chiefly in the wet zone of Sri Lanka. Nitrogen fixation is performed by nodular inhabitants of this cover crop, comparable to the nodule-dwelling bacteria of most other legume plants. We isolated a bacterium (Sub1) from Pueraria phaseoloides, of coccobacillus cell shape, that showed nodulation, when assessed by hydroponics, showing nodules as early as 3 weeks after reinfection. When a nifH fragment from the genome of this bacterium was amplified using a pair of nifH primers, it yielded an amplicon of 360 bp that, when sequenced, helped us identify the bacterium, as belonging to a species of Pseudacidovorax intermedius, at 99% sequence identity. When we constructed a phylogenetic tree with neighboring sequences, we encountered nifH sequences of Pseudacidovorax, forming a monophyletic cluster, which too contained a single Azospirillum species. The genus Pseudacidovorax is a bacterium that, so far, has not been associated with legume nodules. Sub1 secreted a pair of enzymes to the extracellular medium to degrade cellulose and milk proteins. The Sub1 bacterium showed biofilm formation and secreted into the extracellular medium, indole acetic acid. Sub1 also showed a “bulls eye” swarming pattern for the chemoattractant proline, while showing no significant chemotaxis movement, for naringenin, quercetin, and glutamate. Sub1 too possesses the basic genetic foundation (nifH and nifD) to produce a molybdenum-dependent nitrogenase enzyme. We finally show that this rare nonrhizobial bacterium is able to impact, positively, nodulation and shoot length of Pueraria plants, demonstrating that this beta-proteobacterium can abet the biological vigor of this legume cover crop.

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Lipshitz, Robert, Peter S. Ozsváth, and Dylan P. Thurston. "Bordered Floer homology and the spectral sequence of a branched double cover II: the spectral sequences agree." Journal of Topology 9, no. 2 (June 2016): 607–86. http://dx.doi.org/10.1112/jtopol/jtw003.

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30

Brotodewo, Adrienne, Caroline Tiddy, Diana Zivak, Adrian Fabris, David Giles, Shaun Light, and Ben Forster. "Recognising Mineral Deposits from Cover; A Case Study Using Zircon Chemistry in the Gawler Craton, South Australia." Minerals 11, no. 9 (August 25, 2021): 916. http://dx.doi.org/10.3390/min11090916.

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Detrital zircon grains preserved within clasts and the matrix of a basal diamictite sequence directly overlying the Carrapateena IOCG deposit in the Gawler Craton, South Australia are shown here to preserve U–Pb ages and geochemical signatures that can be related to underlying mineralisation. The zircon geochemical signature is characterised by elevated heavy rare-earth element fractionation values (GdN/YbN ≥ 0.15) and high Eu ratios (Eu/Eu* ≥ 0.6). This geochemical signature has previously been recognised within zircon derived from within the Carrapateena orebody and can be used to distinguish zircon associated with IOCG mineralisation from background zircon preserved within stratigraphically equivalent regionally unaltered and altered samples. The results demonstrate that zircon chemistry is preserved through processes of weathering, erosion, transport, and incorporation into cover sequence materials and, therefore, may be dispersed within the cover sequence, effectively increasing the geochemical footprint of the IOCG mineralisation. The zircon geochemical criteria have potential to be applied to whole-rock geochemical data for the cover sequence diamictite in the Carrapateena area; however, this requires understanding of the presence of minerals that may influence the HREE fractionation (GdN/YbN) and/or Eu/Eu* results (e.g., xenotime, feldspar).

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31

Minutillo, S. A., A. Marais, T. Mascia, C. Faure, L. Svanella-Dumas, S. Theil, A. Payet, et al. "Complete Nucleotide Sequence of Artichoke latent virus Shows it to be a Member of the Genus Macluravirus in the Family Potyviridae." Phytopathology® 105, no. 8 (August 2015): 1155–60. http://dx.doi.org/10.1094/phyto-01-15-0010-r.

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Complete genomic sequences of Artichoke latent virus (ArLV) have been obtained by classical or high-throughput sequencing for an ArLV isolate from Italy (ITBr05) and for two isolates from France (FR37 and FR50). The genome is 8,278 to 8,291 nucleotides long and has a genomic organization comparable with that of Chinese yam necrotic mosaic virus (CYNMV), the only macluravirus fully sequenced to date. The cleavage sites of the viral polyprotein have been tentatively identified by comparison with CYNMV, confirming that macluraviruses are characterized by the absence of a P1 protein, a shorter and N-terminally truncated coat protein (CP). Sequence comparisons firmly place ArLV within the genus Macluravirus, and confirm previous results suggesting that Ranunculus latent virus (RALV), a previously described Macluravirus sp., is very closely related to ArLV. Serological relationships and comparisons of the CP gene and of the partial RaLV sequence available all indicate that RaLV should not be considered as a distinct species but as a strain of ArLV. The results obtained also suggest that the spectrum of currently used ArLV-specific molecular hybridization or polymerase chain reaction detection assays should be improved to cover all isolates and strains in the ArLV species.

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32

贾, 雁宇. "The Minimum Cover Cost of a Tree with Given Degree Sequence." Advances in Applied Mathematics 10, no. 07 (2021): 2605–13. http://dx.doi.org/10.12677/aam.2021.107270.

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33

Tull, James F., William I. Ausich, Mark S. Groszos, and Troy W. Thompson. "Appalachian Blue Ridge cover sequence ranges at least into the Ordovician." Geology 21, no. 3 (1993): 215. http://dx.doi.org/10.1130/0091-7613(1993)021<0215:abrcsr>2.3.co;2.

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34

Mauro, Rosario Paolo, Umberto Anastasi, Sara Lombardo, Gaetano Pandino, Roberto Pesce, Restuccia Alessia, and Giovanni Mauromicale. "Cover crops for managing weeds, soil chemical fertility and nutritional status of organically grown orange orchard in Sicily." Italian Journal of Agronomy 10, no. 2 (June 23, 2015): 101. http://dx.doi.org/10.4081/ija.2015.641.

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Cover crops can offer significant advantages in the agronomic management of citrus orchards in Mediterranean environments. Therefore, a three-year research was conducted in eastern Sicily aimed at studying the effects of four cover crop sequences (Sinapis arvensis-Trigonella foenum-graecum-T. foenum-graecum; Medicago scutellata-Avena sativa-Lolium perenne; Vicia faba minor-A. sativa-A. sativa; A. sativa-V. faba. minor-L. perenne) on weeds, major soil chemical properties and nutritional status of an organically grown orange orchard. The results highlighted that, among the studied cover crop sequences, Vicia faba-Avena-Avena was the most beneficial for weeds control within the orchard (92%, of cover crop cover, and 586 and 89 g DW m–2 of cover crop aboveground biomass and weeds aboveground biomass, respectively). Overall, the chemical fertility of the soil was positively influenced. In particular, it was observed an increase of the content of total nitrogen and available phosphorus in the soil by both Sinapis-Trigonella-Trigonella (0.75 g kg–1 and 59.0 mg kg–1, respectively) and Vicia faba-Avena-Avena (0.70 g kg–1 and 56.0 mg kg–1, respectively) cover crop sequences. Medicago-Avena-Lolium sequence seemed to be the most useful to ensure a better nutritional status of the orange orchard.

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35

Coward, M. P. "The thrust structures of southern Assynt, Moine thrust zone." Geological Magazine 122, no. 6 (November 1985): 595–607. http://dx.doi.org/10.1017/s0016756800032015.

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AbstractThe Moine thrust zone of southern Assynt forms part of the northwest margin of the Caledonide belt and has aroused controversy concerning amounts and timing of thrust displacement and sequence of thrust development. Recent mapping shows it to have been a foreland propagating thrust sequence; the uppermost ductile Moine thrust formed first, followed by sequences of imbricates, a major thrust (the Ben More thrust) and then several lower duplex zones. This sequence is clear from new observations that many of the earlier thrusts were folded and/or breached during the development of the underlying structures. A displacement of over 54 km has been estimated for the zone as a whole. An alkaline igneous complex, including the large Borrolan syenite, was intruded during the development of the thrust zone and much of it was carried some 30 km to the west-northwest onto the foreland. Late extensional structures in southern Assynt are an integral part of the Caledonide thrust sequence and probably developed from the collapse of the thrust wedge as it climbed from stronger basement rocks on to a weaker cover sequence on the foreland.

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36

Chmel, A., V. S. Kuksenko, V. S. Smirnov, and N. G. Tomilin. "Anomalies of critical state in fracturing geophysical objects." Nonlinear Processes in Geophysics 14, no. 2 (March 6, 2007): 103–8. http://dx.doi.org/10.5194/npg-14-103-2007.

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Abstract. Non-linear time-sequences of fracture-related events were studied in drifting sea-ice and fracturing rock. A reversible drop of the b-value was detected prior to the large-scale sea-ice cover fragmentation, when the time sequence of impact interactions between ice-fields was fully decorrelated. A similar loss of the temporal invariance of the fracture process was revealed in the time sequence of microfracture events detected in a loaded rock sample. These temporal gaps in the continuous critical state of the considered self-organizing, open systems were attributed to the property of hierarchicity inherent in the geophysical objects. A combination of scaling and hierarchic features in the behavior of fracturing solids manifests itself in the heterogeneity of the temporal pattern of fracture process.

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37

Bleeker, Wouter, John WF Ketchum, Valerie A. Jackson, and Michael E. Villeneuve. "The Central Slave Basement Complex, Part I: its structural topology and autochthonous cover." Canadian Journal of Earth Sciences 36, no. 7 (July 1, 1999): 1083–109. http://dx.doi.org/10.1139/e98-102.

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New field and geochronological data are used to define the distribution of Mesoarchean basement rocks in the south-central Slave Province. This distribution reflects a single contiguous basement terrane that we propose to call the Central Slave Basement Complex. It shows a structural topology that is internally consistent and compatible with known regional folding and faulting events. A sample of a proposed basement gneiss below the Courageous Lake greenstone belt, central Slave Province, has been dated by U-Pb methods and yields an age of 3325 ± 8 Ma, consistent with the new basement distribution. This sample also contains 2723 ± 3 Ma metamorphic zircon and ca. 2680 Ma titanite. The Central Slave Basement Complex is overlain by a thin, discontinuous, but distinctive cover sequence that includes minor volcanic rocks, clastic sedimentary rocks, and banded iron formation. All previously known and some new occurrences of this distinctive cover sequence occur in the immediate stratigraphic hanging wall of the Central Slave Basement Complex, locally overlying a preserved in situ unconformity. We propose to call this post-2.93 Ga cover sequence the Central Slave Cover Group. It is perhaps best typified by detrital chromite-bearing, fuchsitic quartzites. Formal formation names are proposed for the spatially separate occurrences of the Central Slave Cover Group. Detrital zircon ages are presented for one of the formations of the Central Slave Cover Group, the Patterson Lake Formation, which occurs on the western flank of a local basement culmination known as the Sleepy Dragon Complex. The detrital zircon data provide evidence for two discrete basement sources dated at ca. 2943 Ma and ca. 3147-3160 Ma. These detrital ages reinforce the depositional link between the Central Slave Cover Group and underlying crystalline rocks of the Central Slave Basement Complex.

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38

Swanton, C. J., K. Chandler, and K. J. Janovicek. "Integration of cover crops into no-till and ridge-till wheat (Triticum aestivum L.) – corn (Zea mays L.) cropping sequence." Canadian Journal of Plant Science 76, no. 1 (January 1, 1996): 85–91. http://dx.doi.org/10.4141/cjps96-013.

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The use of underseeded red clover (Trifolium pratense L.) as a cover crop in winter wheat has been declining because of poor clover establishment during dry growing seasons, the lack of selective herbicides for weed control in clover, and the difficulty in using burn-down herbicides to remove the clover before planting no-till corn. During 1990–1992, we conducted on-farm trials on silt loam no-till and sandy ridge-till fields in southern Ontario to evaluate the establishment and growth of alternative stubble-seeded cover crops following wheat and their effects on subsequent weed and volunteer wheat growth. In general, oats (Avena sativa L.), oilseed radish (Raphanus sativus L.), and barley (Hordeum vulgare L.) produced more biomass than the other stubble-seeded cover crops, hairy vetch (Vicia villosa Roth.), red clover, and buckwheat (Fagopyrum esculentum L.). In comparison, winter-hardy underseeded hairy vetch and red clover produced the most biomass and provided better weed control; however, any reduction in herbicide use is offset by the need to burn down these cover crops. An evaluation of cover-crop effects on post-wheat-harvest weed growth was not possible because of sparse and variable weed growth, which occurred even in the absence of a cover crop. However, volunteer wheat biomass was inversely correlated with cover-crop biomass. At the no-till site, cover-crop response to straw baling and the subsequent effects on weed and volunteer wheat growth and corn performance also were evaluated. Straw baling had minimal effects on cover-crop growth; however, volunteer wheat growth doubled. No-till corn was not adversely affected by the amounts of residue present where cover crops were established the previous year. Importantly, reducing the amount of wheat straw by baling increased early-season growth rates and corn grain yield by 0.91 Mg ha−1. We conclude that alternative stubble-seeded cover crops, such as oats, barley and oilseed radish, are suitable for no-till corn. At present, cover crops augment weed management but are not a substitute for herbicides, as burn-down herbicides are required to remove existing weeds or winter-hardy cover crops. Key words: Underseeded, stubble seeded, baling, volunteer wheat

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39

Ðoković, Dragomir Ž. "Classification of Base Sequences." International Journal of Combinatorics 2010 (June 28, 2010): 1–21. http://dx.doi.org/10.1155/2010/851857.

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Base sequences BS are quadruples of -sequences , with A and B of length and C and D of length n, such that the sum of their nonperiodic autocor-relation functions is a -function. The base sequence conjecture, asserting that BS exist for all n, is stronger than the famous Hadamard matrix conjecture. We introduce a new definition of equivalence for base sequences BS and construct a canonical form. By using this canonical form, we have enumerated the equivalence classes of BS for . As the number of equivalence classes grows rapidly (but not monotonically) with n, the tables in the paper cover only the cases .

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40

XIE, MINZHU, JIANXIN WANG, and JIANER CHEN. "A practical parameterised algorithm for the individual haplotyping problem MLF." Mathematical Structures in Computer Science 20, no. 5 (October 2010): 851–63. http://dx.doi.org/10.1017/s096012951000023x.

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Haplotypes are more useful in complex disease gene mapping than single-nucleotide polymorphisms (SNPs). However, haplotypes are difficult to obtain directly using biological experiments, which has prompted research into efficient computational methods for determining haplotypes. The individual haplotyping problem called Minimum Letter Flip (MLF) is a computational problem that, given a set of aligned DNA sequence fragment data of an individual, induces the corresponding haplotypes by flipping minimum SNPs. There has been no practical exact algorithm for solving the problem. Due to technical limits in DNA sequencing experiments, the maximum length of a fragment sequenced directly is about 1kb. In consequence, with a genome-average SNP density of 1.84 SNPs per 1 kb of DNA sequence, the maximum number k1 of SNP sites that a fragment covers is usually small. Moreover, in order to save time and money, the maximum number k2 of fragments that cover an SNP site is usually no more than 19. Building on these fragment data properties, the current paper introduces a new parameterised algorithm with running time O(nk22k2 + mlogm + mk1), where m is the number of fragments and n is the number of SNP sites. In practical biological applications, the algorithm solves the MLF problem efficiently even if m and n are large.

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41

Tanner, M. J. A., P. G. Martin, and S. High. "The complete amino acid sequence of the human erythrocyte membrane anion-transport protein deduced from the cDNA sequence." Biochemical Journal 256, no. 3 (December 15, 1988): 703–12. http://dx.doi.org/10.1042/bj2560703.

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1. We have isolated cDNA clones corresponding to the red cell membrane anion-transport protein (Band 3). 2. The cDNA clones cover 3475 bases of the mRNA and contain the entire protein-coding region, 150 bases of the 5′ untranslated region and part of the 3′ non-coding region, but do not extend to the 3′ end of the mRNA. 3. The translated protein sequence predicts that the human red cell anion transporter contains 911 amino acids. 4. The availability of the amino acid sequence allows the interpretation of some of the many studies on the chemical and proteolytic modification of the human protein aimed at examining the structure and mechanism of this membrane transport protein.

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42

Eisold, Anne-Mareen Ellen. "Molecular Characterization of the Movement and Coat Proteins of a New Elm Mottle Virus Isolate Infecting European White Elm (Ulmus laevis Pall.)." International Journal of Phytopathology 8, no. 1 (March 10, 2019): 01–07. http://dx.doi.org/10.33687/phytopath.008.01.2742.

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European white elms (Ulmus laevis Pall.) growing in a park in Caputh near Berlin (Germany) were regularly monitored over a period of 18 years showing virus infection-like symptoms such as chloroses, chlorotic ringspots, mottling and dieback. To obtain the evidence for viral infection, RNA-seq using an Illumina Hi Seq2500 was conducted and three contigs were obtained. They match with the three EMoV genomic RNAs and cover the open reading frames for the viral replicase, the polymerase and the movement and coat proteins (MP, CP). The contigs show identities of 95.3–96.4%, 91.9–93.3% and 89.0–92.5% at the nucleotide level with RNA 1, RNA 2 and RNA 3 of reference sequences, respectively. The analyses of the MP and CP showed significant differences in amino acid sequence compositions compared to those of reference EMoV sequences. These results demonstrate the presence of a so far unknown isolate of EMoV. This is the first report of sequence data of EMoV infecting U. laevis.

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43

PYKÄLÄ, JUHA, ANNINA LAUNIS, and LEENA MYLLYS. "Verrucaria tenebrosa (Verrucariaceae), a new lichen species from Finland and Norway, and notes on the taxonomy of epiphytic taxa belonging to the V. hydrophila complex." Phytotaxa 361, no. 2 (July 19, 2018): 211. http://dx.doi.org/10.11646/phytotaxa.361.2.6.

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Species related to Verrucaria hydrophila and V. placida in Finland were studied based on morphology and ITS sequences. V. tenebrosa is described as new. The species is characterized by a thin, variable-coloured thallus, small and rather sparsely occurring perithecia with a thin thalline cover, and relatively broad ascospores. V. tenebrosa occurs in shady habitats, usually on calcareous pebbles on N-facing cliffs. It has an eastern distribution in Finland, but it also occurs in Norway. The sequences of an epiphytic species V. lignicola were grouped together with V. hydrophila. However, based on morphological differences we consider them not to be conspecific, but suggest that V. hydrophila is a species complex in need of further studies. An epiphytic occurrence of V. hydrophila is confirmed by an ITS sequence. One putative sequence of V. trabicola is also grouped together with V. hydrophila, but further studies are needed on the identity of V. trabicola.

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44

Starovoytov, A. V., K. Z. Valiullina, A. N. Oshkin, and A. M. Piatilova. "Sedimentary cover structure of fresh water lakes of Kindo peninsula near the White sea Biological station of Moscow State University according to georadiolocation and drilling data." Moscow University Bulletin. Series 4. Geology, no. 6 (December 28, 2019): 87–98. http://dx.doi.org/10.33623/0579-9406-2019-6-87-98.

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The geological structure of two freshwater lakes (the Verkhneye and the Vodoprovodnoye) located near the White sea biological Station of the Moscow State University (the Kandalaksha Bay of the White sea) is considered for the first time according to the GPR data. The morphology of the top of the Archean basement, the structure of the Quaternary sedimentary cover and bottom relief were studied. Shallow marine sediments overlying the rocks of the Archean and a sequence of lacustrine-marsh sediments were identified using the drilling data in the Quaternary cover. Structural schemes were constructed for the main reflecting horizons, while isopach schemes were generated on the basis of the main sequences. The values of electrical resistivity and absorption coefficient are calculated and the possibilities of their use for the delineation of GPR facies are considered.

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45

Rodríguez, José L., and Lutz Strüngmann. "Cellular covers of ℵ1-free abelian groups." Journal of Algebra and Its Applications 14, no. 10 (September 2015): 1550139. http://dx.doi.org/10.1142/s021949881550139x.

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In this paper, we first show that for every natural number n and every countable reduced cotorsion-free group K there is a short exact sequence [Formula: see text] such that the map G → H is a cellular cover over H and the rank of H is exactly n. In particular, the free abelian group of infinite countable rank is the kernel of a cellular exact sequence of co-rank 2 which answers an open problem from Rodríguez–Strüngmann [J. L. Rodríguez and L. Strüngmann, Mediterr. J. Math.6 (2010) 139–150]. Moreover, we give a new method to construct cellular exact sequences with prescribed torsion free kernels and cokernels. In particular we apply this method to the class of ℵ1-free abelian groups in order to complement results from the cited work and Göbel–Rodríguez–Strüngmann [R. Göbel, J. L. Rodríguez and L. Strüngmann, Fund. Math.217 (2012) 211–231].

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46

Yurkovskaya, T. K., I. S. Iljina, and I. N. Safronova. "Macrostructure of vegetation cover in Russiaranalysis of map." Geobotanical mapping, no. 2001-2002 (2002): 3–15. http://dx.doi.org/10.31111/geobotmap/2001-2002.3.

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The vegetation map s. 1:15 000 000 reflects the most important space regularities in distribution of vegetation. The regional-typological principle has been used in construction of the legend. The highest divisions of the legend are ''Vegetation of plains" and ''Vegetation of mountains''. The vegetation of plains is further subdivided into types of vegetation: the tundra, boreal, nemoral, steppe and desert one. The next hierarhic stage is represented by regional complexes including mapping categories in their subzonal sequence. In the mapping of montane vegetation we rejected the traditional showing of separate mountain belts. Every mountain massif is showed as a whole retaining the essential features of its separate parts which are accounted for latitudinal position of pedestal, height of given massif, and its meridional position. The typical belt sequence, characterizing the definite segment of mountain massif is used as a mapping unit. Due to such construction of the legend the map conveniently present the botanical-geographic macrostructure of vegetation cover and its separate subdivisions. In the paper regional division of vegetation is considered in detail.

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47

Muscinelli, Samuel P., Wulfram Gerstner, and Johanni Brea. "Exponentially Long Orbits in Hopfield Neural Networks." Neural Computation 29, no. 2 (February 2017): 458–84. http://dx.doi.org/10.1162/neco_a_00919.

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We show that Hopfield neural networks with synchronous dynamics and asymmetric weights admit stable orbits that form sequences of maximal length. For [Formula: see text] units, these sequences have length [Formula: see text]; that is, they cover the full state space. We present a mathematical proof that maximal-length orbits exist for all [Formula: see text], and we provide a method to construct both the sequence and the weight matrix that allow its production. The orbit is relatively robust to dynamical noise, and perturbations of the optimal weights reveal other periodic orbits that are not maximal but typically still very long. We discuss how the resulting dynamics on slow time-scales can be used to generate desired output sequences.

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48

Chakraborty, Suman, and Prof Samir K. Bandyopadhyay. "An approach of image staganography by combine application of DNA sequence and arithmetic encoding." INTERNATIONAL JOURNAL OF MANAGEMENT & INFORMATION TECHNOLOGY 5, no. 3 (September 29, 2013): 636–42. http://dx.doi.org/10.24297/ijmit.v5i3.6572.

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In this paper an attempt has been made to hide an image with in a cover image by using DNA sequence and Arithmetic encoding.DNA sequence used to represent an image and arithmetic encoding convert this DNA sequence in decimal form within the range of 0 to 1.In this procedure encoding has been done in 2 level, 1st Secret-Image converted into decimal form and 2nd decimal form to DNA sequence. So, in this approach secret information is hidden in more depth. Increase depth provides more degree of security from external attack.

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Krützfeldt, Louisa-Marie, Max Schubach, and Martin Kircher. "The impact of different negative training data on regulatory sequence predictions." PLOS ONE 15, no. 12 (December 1, 2020): e0237412. http://dx.doi.org/10.1371/journal.pone.0237412.

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Regulatory regions, like promoters and enhancers, cover an estimated 5–15% of the human genome. Changes to these sequences are thought to underlie much of human phenotypic variation and a substantial proportion of genetic causes of disease. However, our understanding of their functional encoding in DNA is still very limited. Applying machine or deep learning methods can shed light on this encoding and gapped k-mer support vector machines (gkm-SVMs) or convolutional neural networks (CNNs) are commonly trained on putative regulatory sequences. Here, we investigate the impact of negative sequence selection on model performance. By training gkm-SVM and CNN models on open chromatin data and corresponding negative training dataset, both learners and two approaches for negative training data are compared. Negative sets use either genomic background sequences or sequence shuffles of the positive sequences. Model performance was evaluated on three different tasks: predicting elements active in a cell-type, predicting cell-type specific elements, and predicting elements' relative activity as measured from independent experimental data. Our results indicate strong effects of the negative training data, with genomic backgrounds showing overall best results. Specifically, models trained on highly shuffled sequences perform worse on the complex tasks of tissue-specific activity and quantitative activity prediction, and seem to learn features of artificial sequences rather than regulatory activity. Further, we observe that insufficient matching of genomic background sequences results in model biases. While CNNs achieved and exceeded the performance of gkm-SVMs for larger training datasets, gkm-SVMs gave robust and best results for typical training dataset sizes without the need of hyperparameter optimization.

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Ren, Z., and G. G. Zhu. "Pseudo-random binary sequence closed-loop system identification error with integration control." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 223, no. 6 (June 26, 2009): 877–84. http://dx.doi.org/10.1243/09596518jsce794.

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This paper studies the closed-loop system identification (ID) error when a dynamic integral controller is used. Pseudo-random binary sequence (PRBS) q-Markov covariance equivalent realization (Cover) is used to identify the closed-loop model, and the open-loop model is obtained based upon the identified closed-loop model. Accurate open-loop models were obtained using PRBS q-Markov Cover system ID directly. For closed-loop system ID, accurate open-loop identified models were obtained with a proportional controller, but when a dynamic controller was used, low-frequency system ID error was found. This study suggests that extra caution is required when a dynamic integral controller is used for closed-loop system identification. The closed-loop identification framework also has significant effects on closed-loop identification error. Both first- and second-order examples are provided in this paper.

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Journal articles on the topic 'Cover sequence'

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