Multiple RGB images encryption algorithm based on elliptic curve,improved Diffie Hellman protocol

Multimedia Tools and Applications - For the asymmetric key, the Diffie Hellman Key (DHK) protocol is very efficient, but sometimes it is vulnerable against brute force attacks if the parameters are...     

A steady'state capillary cell method for measuring gas-liquid diffusion coefficients

A simple method for measuring diffusion coefficients of gases in liquids using capillary cells has been shown to give accurate results for the diffusivities of carbon dioxide in water, methane in carbon tetrachloride, and carbon dioxide in ethanol when compared with reported values. Diffusivities were also measured at 30°C. for ethane in n-hexane and ethane in n-heptane, and at 40°C. for ethane in n-heptane. The steady-state capillary cell technique appears to be capable of giving reliable diffusivities for a large number of gas-liquid systems.     

Laparoscopic management of ovarian tumors

BACKGROUND: Laparoscopy can be used with minimal operative morbidity to evaluate adnexal masses. We report our experience with the endoscopic approach to the diagnosis and treatment of ovarian tumors. In particular, we describe 11 patients who incidentally underwent laparoscopy and in whom the ovarian masses were found to be malignant. METHODS: Between September 1994 and September 1996, 292 patients with 316 ovarian tumors were treated laparoscopically in the Department of Obstetrics-Gynaecology, University of Ulm. We assessed vaginal ultrasonography, clinical assessment, the tumor marker CA 12-5, and the intraoperative low-power magnification for their value in predicting the final diagnosis in all laparoscopically treated ovarian tumors. RESULTS: From a total of 292 patients with ovarian tumors, 11 were diagnosed, intraoperatively or after final histologic examination, as having a malignant or borderline ovarian tumor. All applied pre- and intraoperative diagnostic procedures were by themselves too unreliable to exclude early stages of ovarian carcinoma exactly. CONCLUSIONS: On the basis of the present findings, we are tempted to conclude that laparoscopic surgery is justified in the management of ovarian tumors. Even with an accurate preoperative selection of suitable patients for laparoscopic surgery, the presence of an undetected ovarian carcinoma cannot be entirely excluded.