Zigzag Pattern Research Articles

Russian President and local self-government: the evolution of relationships

The subject. An attempt is made to analyze the evolution of the relationship between the Russian Presidents and local self-government in modern Russia over the past 30 years.The methodology of the research is based on the application of the historical method and the method of comparative legal analysis of normative legal acts of the Russian Federation of different years.The purpose of the article is to confirm or dispute hypothesis that the President's relations with local self-government developed non-linearly and contradictory on the different stages.The main results, scope of application. The paper examines the dynamics of the relationship between the Russian Presidents and local self-government, determines the five stages of the development of such relations and their characteristic features, as well as the prospects for these relations after the adoption of amendments to the Constitution of the Russian Federation in 2020.Stage 1. The absence of specific regulatory legal provisions on the participation of the President in local self-government issues and the actual practice of their interaction (July 1991 – October 1993).Stage 2. Arbitrary or authoritarian President’s participation in local self-government issues (October 1993 – August 1995). This stage is connected with the period of the constitutional crisis of 1993 and is characterized, first of all, by two decrees of the Russian President directly changing the provisions of the Law of the Russian Federation on Local Self-Government of 1991.Stage 3. Bringing the powers of the President in the field of local self-government in accordance with the Russian Constitution of 1993, the approval by the President of the main directions of state policy in the field of local self – government development in the Russian Federation, the creation of the Council for Local Self-Government under the President of the Russian Federation (August 1995 – August 2000).Stage 4. Strengthening the role of the President in the field of local self-government. The beginning of this stage is connected with the coming to power of the new Russian President (August 2000 – July 2020). So far, this is the longest stage in our chronology. This stage is characterized by additional regulation by the President of certain point issues in the field of organization and implementation of local self-government, directly provided for by federal law. Stage 5. The integration of local self-government bodies into a single system of public power and the receipt by the Russian President of hidden, virtually unlimited powers in the field of local self-government (from July 2020 to the present). The starting point of this stage was the adoption of amendments to the Russian Constitution in 2020.Conclusions. The interaction between the Russian President and local self-government developed in a zigzag pattern: from the complete absence of contacts to the direct intervention of the Russian President in the legal regulation of relations in the field of local self– government, violating and actually canceling the legislative regulation of these relations in 1993-1995. From bringing these relations into line with the Russian Constitution of 1993, which proclaimed the organizational independence of local self-government, to strengthening the role of the Russian President and regulating certain issues in the field of organization and implementation of local self-government. The expansion of the powers of the Russian President in connection with the amendments to the Russian Constitution in 2020 actually means an aside from the organizational independence of local self-government and the integration of local self-government bodies into a single system of public authorities. In this regard, the question arises: do the above amendments mean an actual return to the second stage of the development of relations between the Russian President and local selfgovernment in the period of 1993-1995, when the use of "hidden (implied)" powers of the President was allowed, and, consequently, theoretically unlimited participation of the Russian President in local self-government issues?

ANALISIS PERUBAHAN GARIS PANTAI AKIBAT PENGARUH PEMASANGAN GROPOZAG (Studi Kasus Pantai Neuhen, Aceh Besar)

At the present time, a lot of researchs and treatments have been carried out by experts to minimize the bad effects due to erosion and sedimentation, including the application of groin. Beach structure of the groyne generally used on the Indonesia beaches is groin solid model (impermeable) in which no water can pass the groin. The various types, configuration, material, and height of groin have been applied in Aceh. One of the types is porous zig-zag type groin (gropozag). This type had been tested both as physical model in the laboratory and numerical model. However, the performance application in the field had been rarely carried out. This paper aims to determine the effect of the gropozag application on the coastline changes in the Neuheun Beach. The groin was made of cubes arranged in a zigzag pattern. The size of a unit cube was 1m x 1m x1m with several holes on either side. The upper side was open and the bottom side was completely closed without any holes. Several cube units were assembled into a single groyne series and placed perpendicular to the coast. The observation carried out was without gropozag condition year 2017 and after gropozag installation tear 2019. Output of the research showed that the Gropozag application affected the coastline changes in the left and right area of the Gropozag. The erosion carried out in the left side of the gropozag which was affected by the waves from northeast was higher than the right side of the gropozag. Keywords : coastline change, sedimentation, erosion, groin, gropozag

Comparison of Poisson’s Ratio Measurement Methods: The Extensometer and the Universal Tensile Testing Devices

Auxetic materials with a negative Poison’s ratio (PR) have the potential to meet the demand for different materials, especially technical textiles. In the literature, Universal Tensile Test (UTT) devices and various experimental setups developed by researchers have been used in PR measurements. This study aims to investigate the PR of knitted fabrics with UTT and extensometer devices comparatively by using the same measurement parameters according to ASTM E132. Knitted fabrics with zigzag and foldable patterns were produced in the study because of their auxetic behaviour. It has been determined that the extensometer device can be used as an alternative to the UTT device for PR measurements. While the PR of foldable fabrics cannot be measured with the UTT device because of the fabrics' folding on themselves, it has been observed that it can be easily measured with the extensometer device thanks to the horizontal axis principle.

Tunable phonon-plasmon hybridization in α-MoO3-graphene based van der Waals heterostructures.

The plasmon-phonon hybridization behavior between anisotropic phonon polaritons (APhP) of orthorhombic phase Molybdenum Trioxide (α - MoO3) and the plasmon-polaritons of Graphene layer - forming a van der Waals (vdW) heterostructure is investigated theoretically in this paper. It is found that in-plane APhP shows strong interaction with graphene plasmons lying in their close vicinity, leading to large Rabi splitting. Anisotropic behavior of biaxial MoO3 shows the polarization-dependent response with strong anti-crossing behavior at 0.55 eV and 0.3 eV of graphene's Fermi potential for [100] and [001] crystalline directions, respectively. Numerical results reveal unusual electric field confinement for the two arms of enhanced hybrid modes: the first being confined in the graphene layer representing plasmonic-like behavior. The second shows volume confined zigzag pattern in hyperbolic MoO3. It is also found that the various plasmon-phonon hybridized modes could be wavelength tuned, simply by varying the Fermi potential of the graphene layer. The coupling response of the hybrid structure is studied analytically using the coupled oscillator model. Furthermore, we also infer upon the coupling strength and frequency splitting between the two layers with respect to their structural parameters and interlayer spacing. Our work will provide an insight into the active tunable property of hybrid van der Waals (vdW) structure for their potential application in sensors, detectors, directional spontaneous emission, as well as for the tunable control of the propagating polaritons in fields of flat dispersion where strong localization of photons can be achieved, popularly known as the flatband optics.

Seismic Analysis of L-Shape Multi-Storey RCC Building with X-Bracing in Different Effective Location and Pattern

Abstract: In this day and age of urbanization, there is a strong need for a large-scale high-rise apartment building in every city but high-rise construction systems are extremely difficult to construct in any seismic region due to the intense and disruptive nature of seismic forces. Seismic forces have the highest risk of causing the most harm to high-rise buildings. To meet this need, the Civil Engineering industry is constantly developing new groundbreaking techniques. To solve this problem RCC or steel bracings are provided in high-rise buildings which help to the low down the effect of seismic and wind forces. The main objective of this paper is to locate an effective position and pattern of the RCC X-bracing system in the L- shape multi-storey building which is subjected to seismic forces. According to a previous reference paper, X-bracing produces better results than other bracing systems. Analysis the seven types of frame models are taken – (1) Normal L-shape building without bracing, (2) Xbracing are provided at the face of L-shape building, (3) X-bracing are provided alternative pattern at the face of L-shape building from bottom to top floor, (4) X- bracing are provided zig-zag pattern at the face of L-shape building, (5) X-bracing are provided at the corner of L-shape building, (6) X-bracing are provided alternative pattern at the corner of L-shape building from bottom to the top floor, (7) X-bracing are provided zig-zag pattern at the corner of L-shape building. Developed and evaluated by response spectrum analysis method (Linear dynamic analysis) as per IS 1893-2000 using STAAD PRO V8i. In the present work G+12 storey, the L-shape frame structure is analyzed by using X-bracing. It is analyzed and the results of the Following Parameters are taken - (1) Peak storey shear, (2) Base shear, (3) Nodal displacement, (4) Maximum bending moment, (5) Total quantity of steel in the whole structure, (6) Total volume of concrete in the whole structure are evaluated and compared. Keywords: RCC Bracing, Seismic Behavior, Seismic Analysis, Peak Storey Shear, Base shear, Nodal Displacements, Maximum Bending Moment, The Total Quantity of Steel, The Total Volume of Concrete

شبیه‌سازی رشد و نمو گوجه‌فرنگی (Lycopersicon esculentum Mill.) در شرایط تنش خشکی: 1- محتوای رطوبت خاک، تبخیر وتعرق و پوشش کانوپی

Introduction: The modeling approach for the simulation of the growth and development of tomatoes in Iran has been overlooked. Calibrated crop simulation models, therefore, are increasingly being used as an alternative means for the rapid assessment of water-limited crop yield over a wide range of environmental and management conditions. AquaCrop is a multi-crop model that simulates the water-limited yield of herbaceous crop types under different biophysical and management conditions. It requires a relatively small number of explicit and mostly intuitive parameters to be defined compared to other crop models and has been validated and applied successfully for multiple crop types across a wide range of environmental and agronomic settings. This study was conducted as a two-year field experiment with the aim of the simulation of soil water content, evapotranspiration, and green canopy cover of tomato using AquaCrop model under different irrigation regimes at two growth stages in Mashhad climate conditions. Materials and Methods: A field experiment was conducted over two consecutive seasons (2016-2017) in the experimental field of Ferdowsi University of Mashhad, located in Khorasan Razavi province, North East of Iran. The experiment was laid out in a split-plot design with different irrigation regimes at the vegetative and at the reproductive stage as the main and subplot factors, replicated thrice. In total, 27 plots of 4.5×3 m (13.5 m2) were used at a planting density of 2.7 plants per m2. Seedlings were planted in a zigzag pattern into twin rows, with a distance of 1.5 m between them, so there were four twin rows of three meters in each plot. The distance between tomato plants within each twin-row was 0.5 meters. A buffer zone spacing of 3 and 1.5 m was provided between the main plots and subplots, respectively. The following experimental factors were studied: three irrigation regimes (100= 100% of water requirement, 75= 75% of water requirement, 50= 50% of water requirement) and two crop growth stages (V= vegetative stage and R= Reproductive stage). The drip irrigation method was used for irrigation. The tomato water requirement was calculated using CROPWAT 8.0 software. The irrigation water was supplied based on total gross irrigation and obtained irrigation schedule of CROPWAT. Model accuracy was evaluated using statistical measures, e.g., R2, normalized root means square error (NRMSE), model efficiency (E.F.), and d-Willmott. The 2016 and 2017 measured soil and canopy data sets were used for calibration and validation of the AquaCrop model, respectively. Results and Discussion: For a water-driven model, such as AquaCrop, it is important to evaluate its effectiveness in simulating soil water content. During calibration (2016), the model simulated the soil water content with good accuracy. The simulated soil water content values were close to the observed values during calibration (2016) for all treatments with R2 ranging from 0.90 to 0.97, NRMSE in range of 8.47 to 17.96%, d varying from 0.76 to 0.99, and M.E. ranging from 0.87 to 0.96. Validation results indicated the good performance of the model in simulating soil water content for most of the treatments (0.79 0.87), good E.F. (>0.61), low estimation errors (RMSE, ranging from only 4.5 to 9.2) and high d values (>0.92). Conclusion: The AquaCrop model (version 6.1) was calibrated and validated for modeling soil water content, evapotranspiration, and green canopy cover for tomatoes under drought stress conditions. In general, soil water content, evapotranspiration, and green canopy cover of tomato were simulated by AquaCrop model with acceptable accuracy in both calibration and validation stages. However, the model performance was more accurate in no and/or moderate stress conditions than in severe water stress environments. In conclusion, the AquaCrop model could be calibrated to simulate the growth and soil water content of tomatoes under temperate conditions reasonably well and become a very useful tool to support the decision on when and how much irrigate. For R2, values > 0.90 were considered very well, while values between 0.70 and 0.90 were considered good. Values between 0.50 and 0.70 were considered moderately well, while values less than 0.50 were considered poor. Root mean square error ranges from 0 to positive infinity and expresses in the units of the studied variable. An RMSE approaching 0 indicates good model performance.

Design of a Dual-Purpose Patch Antenna for Magnetic Resonance Imaging and Induced RF Heating for Small Animal Hyperthermia

The popularity of patch antennas in magnetic resonance imaging (MRI) has reduced because of the large size required for patch antennae to resonate. Since the size of the patch antenna is associated with the wavelength and the wavelengths that are used in MRI are substantially large, large antennas are used. Methods of reducing patch antenna sizes have been proposed; however, these methods reduce the penetration depth and uniformity. In this study, we reduced the area of the patch antenna by 30% by folding the ground and patch planes in a zigzag pattern. The patch antenna produced two main resonant modes. The first mode produced a uniform magnetic field that was used for MRI. The second mode produced a strong and focused electric (|E|)-field, which was used for radiofrequency (RF) heating. Furthermore, we explored the use of a combination of two patch antennas aligned along the z-axis to provide a circular uniform magnetic flux density (|B1|) field at 300 MHz, which corresponds to the Larmor frequency in the 7T MRI system. In addition, the patch antenna configuration will be used for RF heating hyperthermia operating at 1.06 GHz. The target object was a small rat with insertion of colon cancer. Using the proposed configuration, we achieved |B1|-field uniformity with a standard deviation of 3% and a temperature increment of 1 °C in the mimic cancer tissue.

Influence of Infill Patterns Generated by CAD and FDM 3D Printer on Surface Roughness and Tensile Strength Properties

Fused deposition modeling (FDM) is a capable technology based on a wide range of parameters. The goal of this study is to make a comparison between infill pattern and infill density generated by computer-aided design (CAD) and FDM. Grid, triangle, zigzag, and concentric patterns with various densities following the same structure of the FDM machine were designed by CAD software (CATIA V5®). Polylactic acid (PLA) material was assigned for both procedures. Surface roughness (SR) and tensile strength analysis were conducted to examine their effects on dog-bone samples. Also, a finite element analysis (FEA) was done on CAD specimens to find out the differences between printing and simulation processes. Results illustrated that CAD specimens had a better surface texture compared to the FDM machine while tensile tests showed patterns generated by FDM were stronger in terms of strength and stiffness. In this study, samples with concentric patterns had the lowest average SR (Ra) while zigzag was the worst with the value of 6.27 µm. Also, the highest strength was obtained for concentric and grid samples in both CAD and FDM procedures. These techniques can be useful in producing highly complex sandwich structures, bone scaffolds, and various combined patterns to achieve an optimal condition.

Spatiotemporal evolution of transfer structures and linked fault systems in an extensional setting: Southwest Gebel Akheider, Cairo-Suez District, Egypt

Detailed geological field mapping of the area located to the southwest of Gebel Akheider, south-central part of the Cairo-Suez District (Egypt), was carried out to identify the geometry, structural style, and evolution of the normal fault systems in the study area. The present structural geometry of the study area is of Miocene age and is the result of the propagation, kinematic interaction, and eventual linkage of extensional fault segments. Eight mapped relay ramps formed between synthetic non-overlapping and overlapping normal faults. Fault displacement profiles showing variation in displacement along strike revealed steep displacement gradients and local displacement minima at the locations of these relay ramps. Conjugate normal faults in the area also showed signs of kinematic interaction. Fault displacement profiles revealed complimentary displacement distribution between interacting overlapping conjugate faults. In competent rock units (Middle Eocene limestone), this interaction resulted in the formation of horsts and grabens relay zones, while in incompetent rock units (Middle Miocene soft marl and sandy limestone), this interaction resulted in a series of en echelon plunging anticlines and synclines (accommodation folds). Several transfer faults marked by points of local displacement minima were also identified, forming a distinctive zigzag pattern in map view that is characteristic of the Cairo-Suez District. Curved fault traces represent another form of fault linkage in the study area. Fault displacement profiles indicated two different growth mechanisms, either as the result of bilateral growth of two along-strike faults, or the intersection of previously isolated and differently oriented fault segments.

Polymorphism induced gas adsorption on naphthalic imide appended phenothiazine for the detection of volatile organic compounds

In this work, we have developed a new polymorphic phase of 2-(4-(10H-phenothiazin-10-yl)phenyl)-1H-benzo[de]isoquinoline-1,3(2H)-dione(NIPTZ-DM) and compared it with the reported polymeric phase (NIPTZ-C). Single crystal XRD analysis revealed that NIPTZ-C existed in herringbone molecular arrangement and NIPTZ-DM showed a zigzag pattern. The photophysical properties of the two phases in the solid state were explored. The unique crystalline phases were investigated for photo- response behaviour with saturated vapours of volatile organic compounds (VOCs). The gas interaction study was carried with Scanning Kelvin Probe (SKP) system with different VOCs such as acetone, triethylamine (TEA), ethanol, and n-hexane. NIPTZ-DM demonstrated excellent gas response towards acetone vapours and showed a high photo response behaviour. NIPTZ-C exhibits both p-type and n-type behaviour, whereas NIPTZ-DM exhibits only n-type behaviour under UV-light illumination.

Multi-objective optimization of 3D Printing process using genetic algorithm for fabrication of copper reinforced ABS parts

Fused deposition modeling (FDM) is now used in various industriesto create functional parts using polymers and metal reinforced polymer composites to attain desired properties. This study has been performed to acquire best FDM process parameters for maximization of tensile strength, compressive strength, and flexural strength. Copper particle reinforced ABS filament is used for fabrication of test samples to highlight the applications of 3d printing in composites. Multi-objective optimization has been performed using genetic algorithm to optimize three input parameters of FDM i.e. printing temperature, infill pattern, and layer height. The mechanical properties were calculated through Taguchi L9 design of experiments approach. It has been noticed that there was conflicting effect of each FDM parameter on strength. By using a genetic algorithm, the parameters are optimized and hence single combination was achieved i.e. 244.90 °C printing temperature, 0.20 mm layer height, and zig-zag pattern. The study would be helpful to fabricate copper reinforced ABS components for electronics, automobile and aerospace industry.

Design of a viscoelastic layer by incorporating graphite wafers in a zig-zag pattern for the augmented hybrid damping treatment of beam

In the present work, the ascendancy of actively constrained zig-zag 1-3 viscoelastic composite (VEC) layer on hybrid damping is studied. For this analysis, structural beam is taken that consists of substrate layer/beam, constrained zig-zag 1-3 VEC layer and constraining extension actuated piezoelectric layer. The zig-zag 1-3 VEC is configured by incorporating graphite wafers in zig-zag pattern within conventional viscoelastic material (VEM). In order to investigate the hybrid damping characteristics, the finite element (FE) model for structural beam is evolved. In order to study the ascendancy of incorporating graphite wafers in zig-zag pattern within VEM layer, initially, bending and shear strain distributions are evaluated. Moreover, optimal geometrical configuration of present zig-zag 1-3 VEC layer is obtained based on maximal hybrid damping using exhaustive search optimization technique. The results reveal that the augmentation in energy dissipation or hybrid damping for the beam with zig-zag 1-3 VEC layer occurs due to rise in both bending and shear strain in VEM by incorporating graphite wafers in zig-zag pattern while for conventional VEM layer it occurs due to shear strain only. And this augmented energy dissipation ameliorates extension and shear counterparts as well as overall modal loss factor of beam with actively constrained zig-zag 1-3 VEC layer compared to conventional VEM layer.

IDENTIFICATION OF FINE MOTOR SKILLS IN CHILDREN WITH INTELECTUAL DISABILITY

Abstract: The purpose of this study was to describe fine motor skills in mentally retarded children. This study involved 20 mentally retarded children in special schools (SLB) in North Lombok. Identification was carried out using several data collection techniques, namely through observation, filling out instruments and interviewing the teacher. Identification of mentally disabled children focuses on several fine motor skills, namely: making curved lines, making horizontal lines, making circle patterns, cutting straight line pattern paper, cutting zigzag pattern paper, cutting circle pattern paper, cutting square pattern paper, simple drawing, coloring using colored pencils, coloring using crayons, and coloring using watercolors. The results of the study used descriptive analysis with two categorizations. Based on the results of the analysis, it was found that out of 20 mentally retarded children can be categorized as follows: on average 68% of children are in the Start Development category (MB), which means that children are starting to be able to do activities, but still with the help of teachers and 32% of children fall into the Developing Appropriate category Hope (BSH). Thus, through this identification it can improve fine motor skills in mentally retarded children by using other interesting methods or strategies. Keywords: skill, finemotor, intelectual disability

Thematic Progression in Students’ Descriptive Text

A way for developing good writing skills is by using thematic progression. It can help students improve their writing abilities. Theme and rheme are used to analyze the thematic progression. This study aimed to find out the types of thematic progression of students' descriptive texts and the most dominant pattern of thematic progression in students’ descriptive texts. The researcher used the descriptive qualitative method in the research design. There were 50 texts written by students at SMP Swasta Sultan Agung Pematangsiantar. The data was analyzed using (Eggins, 2005) theory as the theoretical framework that found three types of thematic progression. The findings revealed that the students' descriptive texts follow three thematic progression patterns: reiteration or constant pattern, zig-zag or linear pattern, and multiple patterns or split rheme pattern. The constant pattern was the most dominant used by students in 271 occurences (91.80%), followed by zig-zag or linear pattern occurred 13 times (4.4%) and multiple patterns or split rheme pattern occurred 11 times (3.8%)l. The findings show students, in writing descriptive text, tend to use simple thematic progression due to their level of knowledge in grammar and thematic progression is relatively low.

Intrapartal cardiotocographic patterns and hypoxia-related perinatal outcomes in pregnancies complicated by gestational diabetes mellitus

AimsIn previous reports, cardiotocographic (CTG) fetal heart rate (FHR) monitoring has shown only limited benefits in decreasing adverse perinatal outcomes in pregnancies complicated by gestational diabetes mellitus (GDM). The aim of the present study was to evaluate whether an association exists between the recently reported ZigZag pattern (FHR baseline amplitude changes of > 25 bpm with a duration of 2–30 min) and asphyxia-related neonatal outcomes in GDM pregnancies.MethodsIntrapartal CTGs were recorded in a one-year cohort of 5150 singleton childbirths. The following CTG changes were evaluated: ZigZag pattern, saltatory pattern, late decelerations, episodes of tachycardia and bradycardia, reduced variability, and uterine tachysystole. The cohort was divided into three groups: women with GDM, women with normal oral glucose tolerance test (OGTT), and women with no OGTT performed. Umbilical artery (UA) blood gases, Apgar scores, neonatal respiratory distress, and neonatal encephalopathy were used as outcome variables.ResultsGDM was diagnosed in 624 (12.1%), OGTT was normal in 4115 (79.9%), and OGTT was not performed in 411 (8.0%) women. Hypoxia-related ZigZag patterns (OR 1.94, 95% CI 1.64–2.34) and late decelerations (OR 1.65, 95% CI 1.27–2.13) of FHR, as well as a greater risk of fetal asphyxia (UA pH < 7.10 and/or UA BE < -12.0 meq/L and/or Apgar scores < 7 at 5-min) (OR 6.64, 95% CI 1.84–12.03) were observed in those with GDM compared with those without GDM.ConclusionsGDM is associated with intrapartal ZigZag pattern and late decelerations, cord blood acidemia and low 5-min Apgar scores at birth indicating increased occurrence of fetal hypoxia in GDM pregnancies.

Screen-printed conductive pattern on spandex for stretchable electronic textiles

Current stretchable conductive fibers used for electronic textiles have received significant attention, but the fiber-based electronic textiles restrict the elaborate patterning due to the limited weaving process. To fabricate electrical circuits on textiles directly to ultimately combine various electronic devices, different approaches would be required to allow the pattern printing onto the stretchable fabric. Here, screen-printing was taken to prepare a highly durable, stretchable conductive pattern on spandex with elastic recovery and high washing durability. A zigzag pattern with the right angle was selected as an optimal shape to prevent the failure of conductive paste from the spandex after stretching cycles. The pattern can successfully diverge the stress by stretching to the of applied one, which enables the conductive characteristic to maintain from the stress under the range of elastic recovery. Another key issue of wearable electronic textiles is the ability to operate under mechanical stress. Encapsulation is an easy modification method to allow the electrical characteristic of the conductive pattern on the spandex when stretched. We confirmed the pattern after encapsulation could act as conductive wires under the stretching deformation of 18% that was much higher than that of the pattern without encapsulation (7%). Consequently, the results suggest potential and further modification methods to fabricate high durable, stretchable electronic textiles.

Oxygen magnetic polarization, nodes in spin density, and zigzag spin order in oxides

Recent DFT calculations for Ba2CoO4 (BCO) and neutron scattering experiments for SrRuO3 (SRO) have shown that oxygen develops a magnetic polarization. Moreover, DFT calculations for these compounds also unveiled unexpected nodes in the spin density, both along Co-O and Ru-O. For BCO, the overall antiferromagnetic state in its triangular lattice contains unusual zigzag spin patterns. Here, using simple model calculations supplemented by DFT we explain and extend these results. We predict that ligands that in principle should be spinless, such as O$^{2-}$, will develop a net polarization when they act as electronic bridges between transition metal (TM) spins ferromagnetically ordered, regardless of the number of intermediate ligand atoms. The reason is the hybridization between atoms and mobility of the electrons with spins opposite to those of the closest TM atoms. Moreover, for bonds with TMs antiferromagnetically ordered, counterintuitively our calculations show that oxygens should also have a net magnetization for the super-super-exchange cases TM-O-O-TM while for only one oxygen, as in Cu-O-Cu, the O-polarization should cancel. Our simple model also allows us to explain the presence of nodes based on the antibonding character of the dominant singly occupied molecular orbitals along the TM-O bonds. Finally, the zigzag pattern order becomes the ground state mainly due to the influence of the Hubbard $U$, that creates the moments, in combination with a robust easy-axis anisotropy that suppresses the competing 120$^{\circ}$ degree antiferromagnetic order of a triangular lattice. Our predictions are generic and should be applicable to any other compound with characteristics similar to those of BCO and SRO.

Study on production of several soybean varieties with corn intercropping system on dry land in East Lampung, Lampung Province

Soybean is a commodity which is less desirable for farmers to be planted yet it has an increasing high demand for processed food products made from soybean (tofu, tempeh, soy sauce, soy milk, etc.). As a strategic commodity,innovations are needed to provide solutions in order to maintain soybean production, especially in dry land. The purpose of this study was to assess the level of production of several soybean varieties grown using the intercropping system (turiman) with corn on suboptimal dry land. The study was conducted in East Lampung during the 2nd planting season from December 2019 to March 2020. The soybean varieties planted are Dena, Devon, Anjasmoro, and the local one (Tanggamus). The varieties of corn planted are the local existing one. The intercropping system used a corn-soybean pattern of 2 rows of corn and 7 rows of soybeans (Jale 2-7). The corn planted with zigzag pattern. The land area used for intercropping crops is 1 ha. The results showed that the intercropping system between soybeans and corn provided optimal soybean and corn production. The average soybean production was 1.548 kg/ha. The highest soybean production was the Devon variety (2,141 kg/ha) intercropping with corn (BS-18). Meanwhile, the Anjasmoro variety yielded 1.249-1.775 kg/ha, Dena variety yielded 1.428-1.541 kg/ha, and the local Tanggamus variety yielded 971-1.790 kg/ha. Corn production was 11.879-18.672 kg/ha of wet shelled corn. The average corn production was 15.110 kg/ha. The corn-soybean (Jale 2-7) intercropping system was able to optimize the use of dry land based on rainwater irrigation. This innovation contributed to the improvement of the cropping index from CI = 100 to 150-200.

Cohesion and Coherence of Students Recount Texts in Indonesia

This study aimed at analyzing the cohesion and coherence of recount texts and their implication to teaching writing. The data was fifteen recount texts which were non-randomly chosen from the first-grade students of high school in Central Java, Indonesia. This was qualitative research employing cohesion theory by Halliday and Hasan (1976) and thematic progression proposed by Butt et al. (1995). The result of this research showed that most of the cohesive devices employed by the students were personal reference with 58.11%; demonstrative reference and definite article with 7.18%; comparative reference with 0.93%), lexical (repetition 22.21%; synonym 0.66%; superordinate 0.13%), conjunction (temporal conjunction 7.45%; adversative conjunction: 1.33%; additive conjunction 1.06%; causal conjunction 0.66%), and ellipsis with 2%. The presuppositions of the presupposed items and presupposing items were achieved anaphorically and cataphorically; most of them were anaphoric. The distances of the presuppositions were in the forms of immediate ties, mediated ties, and non-mediated ties. Furthermore, immediate ties occurred extensively. Based on the analysis, most of the texts were cohesive due to the achievement of presupposing and presupposed items in every sentence of the texts. Then, coherence of the students recount texts was achieved by employing three kinds of patterns: reiteration/ constant, zig-zag, and multiple thematic progression patterns. Most of the texts were developed by using a reiteration/ constant pattern. Based on the analysis, most texts were not coherent because of the unrelated clauses. As the result, they broke the signposted progression of the texts. The finding was expected to possibly contribute to the process of teaching writing by encouraging the students to create a good text in a cohesive and coherent way.

Adsorption and Light Emission of a Racemic Mixture of [7]thiaheterohelicene-2,13-carboxaldehyde on Au(111), Cu(001), and NiAl(110) Surfaces Investigated Using a Scanning Tunneling Microscope

The coverage-dependent adsorption of a racemic mixture of [7]thiaheterohelicene-2,13-carboxaldehyde on Au(111), Cu(001), and NiAl(110) surfaces was investigated using a scanning tunneling microscope (STM). At a low coverage, the adsorption process for helicene molecules on Au(111) was strongly affected by surface reconstruction. At monolayer saturation coverage, the dominant molecular structure observed on Au(111) characteristically had separated self-assembled twin rows aligned in ⟨112̅⟩ directions. The helicene molecules within these separated twin rows are preferentialy arranged in a zigzag pattern with alternating (M)- and (P)-enantiomers. With increasing molecular coverage, the molecular structural transition from self-assembled twin rows to self-assembled single rows was observed. STM-induced light emission (STM-LE) investigation of helicene molecules on Au(111) showed the suppression of plasmon light emission over the molecules. The adsorption of helicene molecules on Cu(001) and NiAl(110) was quite different from that observed on Au(111). Neither the formation of self-assembled twin rows nor the molecular arrangement into different domains was observed. The formation of molecular clusters on Cu(001) and NiAl(110) was observed. STM-LE investigation of helicene molecules adsorbed on Cu(001) showed the suppression of plasmon light emission over these molecules. In contrast to metallic Au(111) and Cu(001) substrates, STM-LE investigations revealed the enhancement of light emission above the molecular clusters formed on metallic NiAl(110), suggesting plasmon-enhanced molecular light emission.