(2E)-3-(3-Nitro­phen­yl)-1-[4-(piperidin-1-yl)phen­yl]prop-2-en-1-one

In the title compound, C20H20N2O3, the piperidine ring adopts a chair conformation and its mean plane forms dihedral angles of 19.63 (9) and 19.44 (9)°, respectively, with the benzene and the nitro-substituted benzene ring. The benzene and nitro-substituted benzene rings are almost coplanar and make a dihedral angle of 4.78 (8)°. In the crystal, mol­ecules are linked by C—H⋯O hydrogen bonds into two-dimensional networks parallel to the ab plane. The crystal packing is further stabilized by π–π inter­actions [maximum centroid–centroid distance = 3.7807 (12) Å]

N-(2,6-Dichloro­phen­yl)-2-(naphthalen-1-yl)acetamide

In the title compound, C18H13Cl2NO, the naphthalene ring system and the benzene ring form dihedral angles of 74.73 (13) and 62.53 (16)°, respectively, with the acetamide grouping [maximum deviation = 0.005 (3) Å]. The naphthalene ring system forms a dihedral angle of 75.14 (13)° with the benzene ring. In the crystal, mol­ecules are linked by N—H⋯O hydrogen bonds, forming C(4) chains propagating in [010]. The O atom also accepts two C—H⋯O inter­actions

(2E)-3-(3-Bromo-4-meth­oxy­phen­yl)-1-(4,4′′-difluoro-5′-meth­oxy-1,1′:3′,1′′-terphenyl-4′-yl)prop-2-en-1-one

In the title compound, C29H21BrF2O3, the dihedral angles between the central anisole ring and the pendant fluoro­benzene rings are 48.86 (19) and 31.89 (18)°. The dihedral angle between the anisole ring and the 1-bromo-2-meth­oxy­benzene ring linked via the enone bridge is 82.95 (17)°. In the crystal, C—H⋯O hydrogen bonds link the mol­ecules into C(11) chains propagating along [010]

4-Amino-3-{1-[4-(2-methyl­prop­yl)phen­yl]eth­yl}-1H-1,2,4-triazole-5(4H)-thione

In the title triazole compound, C14H20N4S, the dihedral angle between the triazole and benzene rings is 83.29 (11)°. The methine H atom and two methyl groups of the isobutyl group are disordered over two sites with occupancies of 0.684 (9) and 0.316 (9). In the crystal structure, N—H⋯S hydrogen bonds link the mol­ecules into chains running along the b axis. These chains are cross-linked into a two-dimensional network parallel to the ab plane by C—H⋯S hydrogen bonds

(E)-3-(2-Chloro­phen­yl)-1-(2,4-dichloro­phen­yl)prop-2-en-1-one

In the title chalcone derivative, C15H9Cl3O, the dihedral angle between the 2-chloro­phenyl and 2,4-dichloro­phenyl rings is 41.79 (14)°. Weak C—H⋯O and C—H⋯Cl intra­molecular inter­actions involving the enone unit generate S(5) ring motifs. In the crystal structure, the mol­ecules are arranged in a head-to-tail manner along the a axis. These chains are stacked along the b axis

Plastic Pipe Defect Detection Using Nonlinear Acoustic Modulation

This project discuss about the defect detection of plastic pipe by using nonlinear acoustic wave modulation method. Nonlinaer acoustic modulations are investigated for fatigue crack detection. It is a sensitive method for damage detection and it is based on the propagation of high frequency acoustic waves in plastic pipe with low frequency excitation. The plastic pipe is excited simultaneously with a slow amplitude modulated vibration pumping wave and a constant amplitude probing wave. The frequency of both the excitation signals coincides with the resonances of the plastic pipe. An actuator is used for frequencies generation while sensor is used for the frequencies detection. Besides that, a PVP pipe is used as the specimen as it is commonly used for the conveyance of liquid in many fields. The results obtained are being observed and the difference between uncrack specimen and cracked specimen can be distinguished

N-(3,5-Dichloro­phen­yl)-2-(naphthalen-1-yl)acetamide

In the title compound, C18H13Cl2NO, the naphthalene ring system [maximum deviation = 0.038 (4) Å] and the benzene ring form dihedral angles of 69.5 (2) and 37.2 (2)°, respectively, with the essentially planar acetamide unit [maximum deviation = 0.004 (4) Å]. The naphthalene ring system forms a dihedral angle of 52.36 (18)° with the benzene ring. In the crystal, mol­ecules are linked via inter­molecular N—H⋯O hydrogen bonds, forming chains along [001]

(E)-1-(2-Thien­yl)-3-(2,4,5-trimethoxy­phen­yl)prop-2-en-1-one

In the title mol­ecule, C16H16O4S, the enone fragment, thio­phene ring and benzene ring are individually essentially planar. The thio­phene ring is disordered over two sites, corresponding to a rotation of approximately 180° about the single C—C bond to which it is attached. The approximate ratio of occupancies for the major and minor components is 0.872 (2):0.128 (2). The major component of the thio­phene ring and the benzene ring are twisted from each other by 13.92 (19)°. An intra­molecular C—H⋯O hydrogen bond generates an S(5)S(5) ring motif. The crystal structure is stabilized by inter­molecular C—H⋯O hydrogen-bonding inter­actions. In addition, a π–π stacking inter­action, with a centroid–centroid distance of 3.852 (2) Å, and short S⋯O [2.9378 (12) Å] and O⋯O [2.5811 (16) Å] contacts are observed

1-[3-(4-Chloro­phen­yl)-5-(4-meth­oxy­phen­yl)-4,5-dihydro-1H-pyrazol-1-yl]butan-1-one

In the title compound, C20H21ClN2O2, the benzene rings form dihedral angles of 6.35 (5) and 81.82 (5)° with the mean plane of the 4,5-dihydro-1H-pyrazole ring (r.m.s. deviation = 0.145 Å). This latter ring adopts an envelope conformation with the CH grouping as the flap. The dihedral angle between the benzene rings is 75.63 (4)°. In the crystal, mol­ecules are linked by C—H⋯Cl and C—H⋯O hydrogen bonds into chains along [-201]. The crystal structure also features C—H⋯π inter­actions

2-Bromo-1-(4-methyl­phen­yl)-3-phenyl­prop-2-en-1-one. Corrigendum

Corrigendum to Acta Cryst. (2008), E64, o1559