objective: recently the laparoscopic ovarian drilling (lod) has been used as a surgical treatment for ovulation in women with polycystic ovarian syndrome (pcos), although its mechanism and outcomes are still unclear. this study was undertaken to evaluate the in vitro fertilization (ivf)/intracytoplasmic sperm injection (icsi) outcomes in clomiphene-resistant women with pcos who were treated wit...

This paper explores the consequences of applying an ultrasonic vibration-assisted ball burnishing process and its non-vibration assisted version on topology subsurface microstructure a transformation-induced plasticity AISI 301LN alloy. More specifically, four different metallographic conditions provided as 1.5-mm thickness sheets characterized by starting martensite content (3, 10, 20 40 wt.%)...

Hollow needles of micron dimensions have previously been fabricated and envisioned for use with transdermal patches or infusion pumps to achieve painless delivery of drugs to the skin for local and systemic effects without the need for hypodermic needles. However, little work has been carried out to identify methods to effectively use hollow microneedles for drug delivery. To address this need,...

The grinding force is an important index during the process, which affects surface quality and other aspects after machining. However, research on of ceramic matrix composites assisted by two-dimensional ultrasonic vibration-assisted very weak. In this paper, impact relationship between critical cutting depth maximum undeformed chip thickness removal mode was analyzed. On basis, model were deve...

In-situ sampling and analysis is one of the major tasks in future NASA exploration missions. It is essential that the samples acquired on other planets including Mars are free of contaminations from the earth. Recently, a novel drilling technology that is actuated by a piezoelectric drive mechanism was developed and it is called Ultrasonic/Sonic Driller/Corer (USDC). This drill has an inherent ...

Elliptical ultrasonic vibration-assisted milling (EUVAM) is widely used as an efficient processing method for hard-to-machining materials such titanium alloy, superalloy, and hard-brittle materials. To uncover the mechanism of intermittent cutting characteristics in EUVAM, tool-workpiece contact rate model developed by combining with kinematic relationship between tool edge workpiece process. A...

High-efficiency rock-breaking is a problem that has long been studied in the oil- and gas-drilling industry. The successful use of ultrasonic technology related fields prompted us to study how introduce into oil gas drilling. This paper introduces discusses cases breaking fields, summarizes three basic forms action on rocks, namely, resonance, impact cavitation, expounds factors laws affect ult...