Bis[μ-4-hydr­oxy-N′-(4-meth­oxy-2-oxido­benzyl­idene)benzohydrazidato]bis­[pyridine­copper(II)]

In the title compound, [Cu2(C15H12N2O4)2(C6H5N)2], each CuII atom is chelated by the tridentate doubly deprotonated Schiff base and a pyridine mol­ecule in a nearly planar environment (r.m.s. deviation for all non-H atoms = 0.107 Å). The metal ions are bridged by one O atom from the symmetry-related Schiff base ligands, forming a centrosymmetric dinuclear copper(II) complex. The dimeric complex is linked to another dimer via weaker Cu—O inter­actions and also O—H⋯N hydrogen bonds

Tetra-μ2-acetato-bis­{μ2-5-meth­oxy-2-[(2-morpholinoeth­yl)iminio­meth­yl]phenolato}tricadmium(II)

The central CdII atom in the trinuclear title compound, [Cd3(C14H19N2O3)2(CH3COO)4], lies on a center of inversion and is bonded to the O atoms of four acetate groups as well as to the phenolate O atoms of the mono-deprotonated Schiff base ligands in a distorted all-trans octa­hedral geometry. Two of the acetate groups function in a μ2-bridging mode, while the other two each chelate to the terminal CdII atom and simultaneously bind to the central metal atom in a κ3-bonding mode. The Schiff base anions N,O-chelate to the terminal metal atoms. The morpholine ring assumes a chair conformation

Bis{5-methoxy-2-[(2-morpholinoethyl)iminomethyl-κN]phenolato-κO 1}nickel(II)

The asymmetric unit of the crystal structure of the title compound, [Ni(C14H19N2O3)2], contains two independent NiII complex mol­ecules, with the metal atoms each located on a center of inversion. Each metal atom is chelated by two Schiff base anions in a distorted square-planar coordination environment

(E)-4-Hydr­oxy-N′-(2-hydr­oxy-4-methoxy­benzyl­idene)benzohydrazide N,N-dimethyl­formamide solvate

The Schiff base mol­ecule of the title compound, C15H14N2O4·C3H7NO, adopts a trans configuration with respect to the C=N double bond; the Schiff base itself is nearly planar (r.m.s. deviation 0.20 Å). The amido N atom is a hydrogen-bond donor to the dimethyl­formamide solvate mol­ecule. One of the hydr­oxy groups forms an intra­molecular hydrogen bond to the N atom of the C=N double bond, whereas the other forms an inter­molecular hydrogen bond to the carbonyl group

4-Meth­oxy-N′-(2-methoxy­benzyl­idene)benzohydrazide

In the title compound, C16H16N2O3, the two benzene rings are inclined to one another by 75.4 (2)°, and the mol­ecule adopts an E configuration about the C=N bond. In the crystal structure, symmetry-related mol­ecules are linked via inter­molecular N—H⋯O hydrogen bonds, forming chains running parallel to the c axis

(E)-N′-(2,4-Dihy­droxy­benzyl­idene)-4-nitro­benzohydrazide

The title compound, C14H11N3O5, is essentially planar, with an r.m.s. deviation for the non-H atoms of 0.0832 (3) Å. In the crystal, O—H⋯O and N—H⋯O hydrogen bonds link adjacent mol­ecules into layers parallel to (101). These layers are further connected into a three-dimensional network via C—H⋯O inter­actions. In addition, a π–π inter­action occurs between the aromatic rings [centroid–centroid distance = 3.5425 (8) Å]. An intra­molecular O—H⋯N hydrogen bond is also observed

[N′-(4-Meth­oxy-2-oxidobenzyl­idene)4-nitro­benzohydrazidato-κ3 O,N,O′](pyridine-κN)copper(II)

The pyridine-coordinated CuII atom in the title Schiff base complex, [Cu(C15H11N3O5)(C5H5N)], is O,N,O′-chelated by the doubly deprotonated Schiff base ligand. The metal centre is in a square-planar coordination geometry

N′-[1-(2-Hydroxy­phen­yl)ethyl­idene]-2-nitro­benzohydrazide methanol solvate

In the title compound, C15H13N3O4·CH3OH, the dihedral angle between the two substituted benzene rings is 66.7 (2)°. An intra­molecular O—H⋯N hydrogen bond is observed in the Schiff base mol­ecule. In the crystal structure, the Schiff base and solvent mol­ecules are linked into chains running along the a axis by inter­molecular O—H⋯O and N—H⋯O hydrogen bonds

5-Meth­oxy-2-[(2-morpholinoeth­yl)­iminio­meth­yl]phenolate

Each of the two independent mol­ecules of the title comound, C14H20N2O3, exists in the zwitterionic form as the imino N atoms are protonated. The =N—H unit forms an intra­molecular hydrogen bond to the negatively charged O atom, and also a weaker intermolecular N—H⋯O bond, the latter resulting in inversion dimers

The spare part inventory management system (SPIMS) for the profound heritage Sdn Bhd: a case study on the EOQ technique

The inventory management is an important part of supply chain management, which protects the schedule of production or maintenance towards any type of disturbance. This research emphasized on the development of the Spare Part Inventory Management System (SPIMS) for the Profound Heritage Sdn Bhd (PHSB), which is currently adopting the manual Kadex method. This automatic software used the Economic Order Quantity (EOQ) in the periodic review environment to control the inventory and the software was written using the Microsoft Visual Studio 2012. Therefore, this research will not only helps the PHSB but also increased literature on the actual implementation of the EOQ technique in the periodic review environment. This newly developed SPIMS have the ability to keep the spare parts transaction records, calculate the EOQ for each part and remind the user to purchase more spare parts at its dedicated “When to Order” date. The developed SPIMS performance was then evaluated by comparing it to the current Kadex or manual method. The method, which produced the lowest average inventories, is considered as the best method. Comparison across the overall average inventory indicated that the EOQ with zero opening balance (which represented a system that start with zero opening inventories) performs better than the Kadex method. However, the Kadex method is found to perform better than the EOQ when current opening balance is considered. The deterioration in the EOQ performance, when current opening balance is considered, is due to the fact that more data and longer time for observation is required before the EOQ reached its steady state. However, it is expected that the result similar to the EOQ with zero opening balance will be observed when the EOQ (with opening balance) reached it steady state. In addition, the EOQ also produces some shortages on the stock, which is nonexistent in the Kadex method. This problem is caused by the EOQ inability in detecting any shortages as the inventory will only be checked on a specific time interval called the “when to order” date. Due to this, an improvement on the SPIMS is needed. Rather than reviewing the inventories periodically during the “when to order” date, it is suggested that the SPIMS should adopt the continuous review/monitoring environment to optimize its performance