POSFET tactile sensing arrays using CMOS technology

This work presents fabrication and evaluation of novel POSFET (Piezoelectric Oxide Semiconductor Field Effect Transistor) devices based tactile sensing chip. In the newer version presented here, the tactile sensing chip has been fabricated using CMOS (Complementary Metal Oxide Semiconductor) technology. The chip consists of 4 x 4 POSFET touch sensing devices (or taxels) and both, the individual taxels and the array are designed to match spatio–temporal performance of the human fingertips. To detect contact events, the taxels utilize the contact forces induced change in the polarization level of piezoelectric polymer (and hence change in the induced channel current of MOS). The POSFET device on the chip have linear response in the tested dynamic contact forces range of 0.01–3 N and the sensitivity (without amplification) is 102.4 mV/N

Trions in a periodic potential

The group-theoretical classification of trion states is presented. It is based on considerations of products of irreducible representations of the 2D translation group. For a given BvK period N degeneracy of obtained states is N^2. Trions consist of two identical particles so the symmetrization of states with respect to particles transposition is considered. Completely antisymmetric states can be constructed by introducing antisymmetric spin functions. Two symmetry adapted bases are considered. The third possibility is postponed for the further investigations.Comment: revtex, 5 p., sub. to Physica

Tactile Sensing for Robotic Applications

This chapter provides an overview of tactile sensing in robotics. This chapter is an attempt to answer three basic questions: \u2022 What is meant by Tactile Sensing? \u2022 Why Tactile Sensing is important? \u2022 How Tactile Sensing is achieved? The chapter is organized to sequentially provide the answers to above basic questions. Tactile sensing has often been considered as force sensing, which is not wholly true. In order to clarify such misconceptions about tactile sensing, it is defined in section 2. Why tactile section is important for robotics and what parameters are needed to be measured by tactile sensors to successfully perform various tasks, are discussed in section 3. An overview of `How tactile sensing has been achieved\u2019 is given in section 4, where a number of technologies and transduction methods, that have been used to improve the tactile sensing capability of robotic devices, are discussed. Lack of any tactile analog to Complementary Metal Oxide Semiconductor (CMOS) or Charge Coupled Devices (CCD) optical arrays has often been cited as one of the reasons for the slow development of tactile sensing vis-\ue0-vis other sense modalities like vision sensing. Our own contribution \u2013 development of tactile sensing arrays using piezoelectric polymers and involving silicon micromachining - is an attempt in the direction of achieving tactile analog of CMOS optical arrays. The first phase implementation of these tactile sensing arrays is discussed in section 5. Section 6 concludes the chapter with a brief discussion on the present status of tactile sensing and the challenges that remain to be solved

Fixed-gain/adaptive control for simultaneous rejection of broadband and sinusoidal disturbances

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76246/1/AIAA-2001-4095-990.pd

EFFICACY OF YOGA VASTI IN ANOVULATION: A PILOT STUDY

Infertility is commonly increasing problem which any gynaecologist has to face in their gynaecological carrier. Infertility is a common problem of about 10% of women aged 15 to 44. It is a significant problem that affects many couples mental and physical health and disturbs there family as well as social life. Evaluation is the starting point for treatment of infertility as it may suggest specific causes and appropriate treatment modalities. The causes of female infertility is multifactorial, a systematic approach typically is used and involves testing for ovulatory factor, uterotubal factor, and peritoneal factor. Anovulatory dysfunction is a common problem and is responsible for about 40% of female infertility. Polycystic ovarian syndrome (PCOS) remains one of its leading causes. Ayurveda explains many treatment modalities pertaining to infertility. The present pilot study was conducted to evaluate the efficacy of Yoga vasti & oral administration of Ayurvedic drugs (Artava pravartakas & Artava janakas) in the management of Ovulation factor in infertility. This article clearly gives an idea about some successes cases of infertility with anovulation, done in OPD and IPD of PG Dept of Prasuti and Stree roga of Dr BRKR Govt. Ayurvedic Hospital, Hyderabad

A CASE STUDY OF POLYHYDROMNIOS

The fetus develops inside of a sac that is surrounded by a membrane called the amnion. The sac contains amniotic fluid, which surrounds the developing fetus and protects the fetus from injuries. Polyhydramnios (Garbhodhaka vriddhi) is a condition that occurs when there is too much accumulation of liquor amnii. The exact cause is unknown, but it may be the result of deficient absorption & excessive production of liquor amnii. Liquor amnii exceeds 2000ml, AFI is more than 25cm. It probably occurs in 1 in 1000 pregnancies. Susrutha described one characteristic of Garbha vriddhi as Jataraabhi vriddhi (increase in size of the abdomen). That increase may be due to variation in Sankya (multiple pregnancies), size (big baby) or fluid (hydromnios) of Garbha. Bhavamisra adds further that labour is much difficult. Abnormal amniotic fluid volume can be associated with increased maternal risk as well as perinatal morbidity and mortality. Successful management depends upon appropriate diagnostic evaluation. Prolongation of the pregnancy for further fetal maturation may be achieved with timely therapeutics. This article describes the case report of a 23 year old woman who is a primi complicated by polyhydramnios, which developed between 26 & 28 weeks of pregnancy. Ayurveda being an eternal medicine many treatments are described by Acharyas. The background of the study is Jalodara chikitsa. It is concluded that Ayurveda is useful for treating polyhydramnios, as an alternative to Diuretics, Indomethacin & amniocentesis