Syntheses and crystal structures of 2-(p-tolyl)-1H-perimidine hemihydrate and 1-methyl-2-(p-tolyl)-1H-perimidine

The title compounds, 2-(4-methylphenyl)-1H-perimidine hemihydrate (1, C18H14N2·0.5H2O) and 1-methyl-2-(4-methylphenyl)-1H-perimidine (2, C19H16N2), were prepared and characterized by 1H NMR and single-crystal X-ray diffraction. The organic molecule of the hemihydrate lies on a twofold rotation axis while the water molecule lies on the intersection of three twofold rotation axes (point group symmetry 222). As a consequence, the hydrogen atoms that are part of the N—H group and the water molecule as well as the CH3 group of the p-tolyl ring are disordered over two positions. In compound 1, the perimidine and the 2-aryl rings are slightly twisted while its N-methylated derivative 2 has a more distorted conformation because of the steric repulsion between the N-methyl group and the 2-aryl ring. In the crystal structures, molecules of perimidine 2 are held together only by C—H...π contacts while the parent perimidine 1 does not exhibit this type of interaction. Its crystal packing is established by intermolecular N—H...O hydrogen bonds with the solvent water molecules and additionally stabilized by π–π stacking.

Elliptic Curve Pseudorandom Bit Generator with Maximum Period Sequences

Pseudo-random number generator is an important mechanism for cryptographic information protection. It can be used independently to generate special data or as the most important element of security of other mechanisms for cryptographic information protection. The application of transformations in a group of points of elliptic and hypereliptic curves is an important direction for the designing of cryptographically stable pseudo-random sequences generators. This approach allows us to build the resistant cryptographic algorithms in which the problem of finding a private key is associated with solving the discrete logarithm problem. This paper proposes a method for generating pseudo-random sequences of the maximum period using transformations on the elliptic curves. The maximum sequence period is provided by the use of recurrent transformations with the sequential formation of the elements of the point group of the elliptic curve. In this case, the problem of finding a private key is reduced to solving a theoretically complex discrete logarithm problem. The article also describes the block diagram of the device for generating pseudo-random sequences and the scheme for generating internal states of the generator.

Efektifitas Media Leaflet dan Power Point Pada Pengetahuan Remaja Putri Tentang Menstrual Personal Hygiene

ABSTRAKPermasalahan tentang menstruasi merupakan salah satu tantangan menggapai kesehatan reproduksi yang sehat bagi remaja. Tujuan penelitian ini untuk mengetahui perbedaan pengetahuan remaja putri sebelum dan sesudah diberikan penyuluhan dengan menggunakan leaflet dan power point.Jenis penelitian ini adalah quasy eksperimen dengan melakukan pre test dan post test sebelum dan sesudah diberikan penyuluhan yang dilaksanakan pada Maret-April 2021 di kampung Putali wilayah kerja Puskesmas Ebungfauw. Sampel sejumlah 40 remaja putri. Intrument yang digunakan adalah media leaflet dan media power point dan kuesioner yang telah diuji validitas dan relibilitas. Analis data menggunakan uji Paired T-test dan uji Independen t-tes. Rerata pretest pengetahuan kelompok leaflet 53,00 dan posttest 61,25. Rerata pretest pengetahuan kelompok power point 59,75 dan posttest 78,75. Uji paired t-test pengetahuan kelompok leaflet yaitu p-value 0,000 dan pada kelempok power point yaitu p-value 0,000. Uji Efektifitas kelompok leaflet dan kelompok power point adalah 0,008 dengan perbedaan mean 10,00 kelompok leaflet dan mean 19,00 kelompok power point. Sehingga kelompok power point lebih efektif dalam meningkatkan pengetahuan remaja. Media power point lebih efektif dalam meningkatkan pengetahuan remaja putri tentang personal hygiene saat menstruasi. Kata Kunci : pengetahuan; personal hygiene; menstruasi; power point; leaflet ABSTRACT Menstruation is one of problems in achieving healthy reproductive female teenagers. The purpose of this study was to determine the difference in knowledge of female teenagers before and after being given counseling using leaflets and power point media.This research was a quasi-experimental study by conducting a pre-test before being given counseling and a post-test after being given counseling, carried out in March-April 2021 in Putali village, the working area of Ebungfauw Health Center. The sample of this research is 40 female teenagers. The instruments used are leaflet media and power point media and questionnaires that have been tested for validity and reliability. Data analysis used Paired T-test and Independent t-test. The mean of the pretest knowledge of the leaflet group was 53.00 and the posttest was 61.25. The mean of the pretest knowledge of the power point group was 59.75 and the posttest was 78.75. The paired t-test for the knowledge of the leaflet group is p-value 0.000 and for the power point group, the p-value is 0.000. The effectiveness test for the leaflet group and the power point group was 0.008 with a mean difference of 10.00 for the leaflet group and 19.00 for the power point group. So that the power point group is more effective in increasing the knowledge of teenagers. Power point media was more effective in increasing the knowledge of young women about personal hygiene during menstruation. Keywords: knowledg; personal hygiene; menstruation; power point; leaflet

Helical phase in two-dimensional magnets due to four-spin interactions

We demonstrate that in ferromagnets with the D3h point group of symmetry a possible origin of phase transition from a collinear ferromagnetic state to a non-collinear state can be the fourth order contributions to the free energy density that are allowed by this point group of symmetry. At the same time, Dzyaloshinskii-Moria interaction vanishes in such materials. Via symmetry analysis we derive seven possible fourth order contributions to the free energy density with respect to the unit vector of the local magnetization direction but only two of them can be considered as independent. Moreover, for two-dimensional systems only one survives. Considered symmetry class is essential because a large group of two-dimensional intrinsic ferromagnets belongs to it, for example a monolayer Fe3GeTe2. The four-spin chiral exchange does also manifest itself in peculiar magnon spectra and favors spin waves.

Standard mark table and standard USCI-CF table of the point group D6h. Unification of candidates derived from different D6h-skeletons

Combined-permutation representations (CPRs) for characterizing -skeletons (a benzene skeleton, a Haworth-projected skeleton, a superphane skeleton, and a coronene skeleton) are constructed by starting from respective sets of generators, where the permutation of each generator is combined with a mirror-permutation of 2-cycle to treat both achiral and chiral substituents under the GAP system. Thereby, the CPR of degree 8 (= 6 + 2) for the benzene skeleton, the CPR of degree 14 (= 12 + 2) for the Haworth-projected skeleton, the CPR of degree 14 (= 12 + 2) for the superphane skeleton, the CPR of degree 14 (= 12 + 2) for the coronene skeleton are generated to give primary mark tables (tables of marks) based on these CPRs. These primary mark tables generated by the GAP system are different in the sequence of subgroups from each other, although they stem from the same point group . They are unified into a single standard mark table by means of a newly-devised GAP function MarkTableforUSCI. Moreover, another newly-devised GAP function constructUSCITable is employed to construct a standard USCI-CF (unit-subduced-cycle-index-with-chirality-fittingness) table concordantly. After a set of PCI-CFs (partial cycle indices with chirality fittingness) is calculated for each skeleton, symmetry-itemized combinatorial enumeration is conducted by means of the PCI method of Fujita’s USCI approach (S. Fujita, Symmetry and Combinatorial Enumeration in Chemistry, Springer-Verlag, Berlin-Heidelberg, 1991).

propSym: a tool to establish relationships between property constants for material property tensors of any order

The properties of crystalline materials can be described mathematically by tensors whose components are generally known as property constants. Tabulations of these constants in terms of the independent components are well known for common material properties (e.g. elasticity, piezoelectricity etc.) aptly described by tensors of lower rank (e.g. ranks 2–4). General relationships between constants of higher rank are often unknown and sometimes reported incorrectly. A computer program is developed here to calculate the property constant relationships of a property of any order, represented by a tensor of any rank and point group. Tensors up to rank 12, e.g. the tensor of sixth-order elastic constants c 6 ijklmnpqrs , can be calculated on a standard computer, while ranks higher than 12 are best handled on a supercomputer. Output is provided in either full index form or a reduced index form, e.g. the Voigt index notation common to elasticity. As higher-order tensors are often associated with nonlinear material responses, the program provides an accessible means to investigate the important constants involved in nonlinear material modeling. The routine has been used to discover several incorrect relationships reported in the literature.

Characterizing the universal rigidity of generic tensegrities

A tensegrity is a structure made from cables, struts, and stiff bars. A d-dimensional tensegrity is universally rigid if it is rigid in any dimension $$d'$$ d ′ with $$d'\ge d$$ d ′ ≥ d . The celebrated super stability condition due to Connelly gives a sufficient condition for a tensegrity to be universally rigid. Gortler and Thurston showed that super stability characterizes universal rigidity when the point configuration is generic and every member is a stiff bar. We extend this result in two directions. We first show that a generic universally rigid tensegrity is super stable. We then extend it to tensegrities with point group symmetry, and show that this characterization still holds as long as a tensegrity is generic modulo symmetry. Our strategy is based on the block-diagonalization technique for symmetric semidefinite programming problems, and our proof relies on the theory of real irreducible representations of finite groups.

The determination of point groups from imprecise molecular geometries

We present a new approach for the assignment of a point group to a molecule when the structure conforms only approximately to the symmetry. It proceeds by choosing a coordinate frame that minimises a measure of symmetry breaking that is computed efficiently as a simple function of the molecular coordinates and point group specification.

Electron and Positron Scattering by Non-Central Potentials: Matrix Elements and Symmetry Properties in the First Born Approximation

The Fourier transform of Cartesian Gaussian functions product is presented in the light of positron scattering. The calculation of this class of integrals is crucial in order to obtain the scattering amplitude in the first Born approximation framework for an ab initio method recently proposed. A general solution to the scattering amplitude is given to a molecular target with no restriction due to symmetry. Moreover, symmetry relations are presented with the purpose of identifying terms that do not contribute to the calculation for the molecules in the D∞h point group optimizing the computational effort. Keywords — Positron and electron scattering, Fourier transform of the Gaussian product theorem, McMurchie-Davidson procedure, Obara-Saika procedure, linear molecules .

Anti-bacterial Efficacy of WHO Recommended Locally made Alcohol based Hand Rub in a Resource Constraint Environment

Healthcare-associated infections (HCAIs) are a major concern and associated with noticeable morbidity and mortality. To combat this, the simple strategy is hand hygiene (HH). In a resource constraint settings one of the important reason for poor hand hygiene compliance is irregular supply of HH products. This study was done to assess the cost effectiveness and acceptability of WHO recommended locally made alcohol based hand rub. The study was carried out in 28 HCPs working in an IMCU. Samples for the assessment of the microbial hand contamination were collected by direct fingerprint of their dominant hand onto the blood agar plates at three different time point. Group A samples collected in random. Group B samples collected immediately after patient physical examination. Group C were group B representatives collected after cleaning their hands with locally made isopropyl alcohol based hand rub. No significant difference in colony count between the groups A and B was observed. On the other hand, there was a statistically significant difference in colony count between the groups B and C (P=0.05). It means that the rubbing of the hands using locally made WHO recommended hand sanitizer enabled to eradicate the bacterial flora remarkably from the hands of HCPs.