Tether-net is a promising active debris removal technique, and closing mechanism can ensure the reliable wrapping of space by using tether-net. This study focuses on dynamics model split sliding joint between thread ring. First, new kind proposed, which drives to close net mouth through masses, mass-spring-damper method used Thereafter, for first time, thread-ring proposed based method, be simu...

The title tricyclic diene, C(24)H(22)Cl(2), is the product of thermal ring-opening of a corresponding basketane (penta-cyclo-[4.4.0.0(2,5).0(3,8).0(4,7)]deca-ne) derivative. The cyclo-butene ring is planar to within 0.0032 (12) Å and its geometry is normal. The two 4-chloro-phenyl groups are oriented in an approximately face-to-face conformation with a dihedral angle of 44.14 (6)° between them....

In the title compound, C(23)H(17)ClN(2)O(3), the quinazoline fused-ring system, including the ring-bound carbonyl-O and methyl-C atoms, is close to being planar (r.m.s. deviation = 0.044 Å) and is essentially orthogonal to both the 2-tolyl ring [dihedral angle = 89.51 (8)°] and to the ester group [the C-O-C-C torsion angle = -103.69 (16)°]. The carboxyl-ate group is almost coplanar with the ben...

In the title compound, C(33)H(30)N(2)O(3), the pyrrolidine ring adopts an envelope conformation in which the H atom attached the an ortho-C atom deviates from the plane, whereas the cyclo-hexa-none ring in the tetra-hydro-naphthalene fused-ring system adopts a sofa conformation. The oxindoline ring system is almost perpendicular with respect to the mean plane of the pyrrolidine ring, with a dih...

prepared, and their Ca2+ -antagonistic activity was evaluated. Among these compounds, the N-Me derivatives with m-OMe, p-F, p-Cl, 3,4-(OM4 and 3,5-(OMe)2 substituents on the A ring were found to show higher Ca2+ -antagonistic activity than verapamil . The effect of substituents on the A ring was examined quantitatively using physicochemical substituent parameters and regression analysis. The an...

We establish commutativity theorems for certain classes of rings in which every invertible element is central, or, more generally, in which all invertible elements commute with one another. We prove that if R is a semiexchange ring (i.e. its factor ring modulo its Jacobson radical is an exchange ring) with all invertible elements central, then R is commutative. We also prove that if R is a semi...

The title mol-ecule, C(13)H(17)NO, is close to planar: the dihedral angle betweent the dimethyl amino group and the benzene ring is 7.94 (19)°. No significant inter-molecular inter-actions are observed in the crystal structure.

BACKGROUND Digital nerve block is commonly performed by care providers in medical fields. This study compares the blocks in terms of effectiveness of anesthesia and pain. METHODS Patients were divided into two groups. First group underwent digital block whereas 2nd group had transmetacarpal digital block. The subcutaneous ring block was performed by two injections of 3 ml of 2% lignoca...