We investigate the impact of power MOSFET channel width on the power efficiency of a switch-mode power supply. With this analysis, we derive a circuit-specific criterion that minimizes the power ...dissipated by a power MOSFET, which is based on the ratio between on resistance and output capacitance of the MOSFET and is independent of its technological parameters. The effect of channel width on the power dissipation is illustrated by simulation-based analysis, which also provide an example of a published non-optimum selection of a power MOSFET and demonstrate the advantage of the newly proposed method for MOSFET selection.
Montgomery T-tube used to maintain a patent airway in post tracheostomised patients can act like a double edged sword. We report a case where a T-tube migrated into distal airway leading a precarious ...situation.
Abstract
In this research work, the problem is to reduce the surface roughness of the Jacquard body which is a casting part to optimize the effects of different process parameters of surface ...roughness & to reduce surface roughness for milling operation by using the Taguchi method. Milling is better than other machines in the surface finish and accuracy. Greater quality product and higher productivity is the main vision of every entrepreneur. To achieve this, the process parameters of each process need to be optimized. In a milling machine, some of the important parameters like feed rate, depth of cut, speed, etc, play an important role in achieving the required quality product. To optimize these parameters, the most suitable and widely used method is the Taguchi method. The most significant objective of this research is to obtain effective quality parameters. Experimentation is done on the Jacquard body by varying the milling machine parameters. The experimental results indicate that the minimum surface roughness is obtained for the process parameters feed 0.7 mm per revolution, speed 225 rpm and 1.5 mm depth of cut. This study recommended that more surface finish be obtained by increasing speed, low feed rate, and depth of cut.
Optimizing cardiovascular function to ensure adequate tissue oxygen delivery is a key objective in the care of critically ill patients with burns. Hemodynamic monitoring may be necessary to optimize ...resuscitation in serious burn patients with reasonable safety. Invasive central venous pressure (CVP) monitoring has become the corner stone of hemodynamic monitoring in patients with burns but is associated with inherent risks and technical difficulties. Previous studies on perioperative patients have shown that measurement of peripheral venous pressure (PVP) is a less invasive and cost-effective procedure and can reliably predict CVP.
The aim of the present prospective clinical study was to determine whether a reliable association exists between changes in CVP and PVP over a long period in patients admitted to the Burns Intensive Care Unit (BICU).
The CVP and PVP were measured simultaneously hourly in 30 burns patients in the BICU up to 10 consecutive hours. The predictability of CVP by monitoring PVP was tested by applying the linear regression formula and also using the Bland-Altman plots of repeated measures to evaluate the agreement between CVP and PVP.
The regression formula revealed a reliable and significant association between CVP and PVP. The overall mean difference between CVP and PVP was 1.628 ± 0.84 mmHg (P < 0.001). The Bland-Altman diagram also showed a perfect agreement between the two pressures throughout the 10 h period.
Peripheral venous pressure measured from a peripheral intravenous catheter in burns patients is a reliable estimation of CVP, and its changes have good concordance with CVP over a long period of time.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
Trans-anal protrusion of intussusception in a neonate Mathur, Praveen; Sultania, Saurav; Boipai, Manika ...
Journal of pediatric surgery case reports,
March 2020, 2020-03-00, 2020-03-01, Letnik:
54
Journal Article
Recenzirano
Odprti dostop
Intussusception in neonates is an exceedingly rare entity. The incidence of malrotation in cases of childhood intussusception is around 40%. However, there is no clear data on the incidence of such ...occurrence in a neonate. We describe a case of compound intussusception with intestinal malrotation in a neonate presenting as trans-anal prolapse.
•Intussusception in neonates is an exceedingly rare entity.•TAPI is an uncommon manifestation of childhood and has never been reported in a neonate.•The association of intussusception and intestinal malrotation is referred to as Waugh Syndrome.
Abstract This article investigates the trapping mechanism in AlGaN/GaN heterostructure. For our study, the traps within the AlGaN layer are introduced at the interface and near the interface of ...AlGaN/GaN, in the SILVACO TCAD tool. Frequency-dependent capacitance-Voltage ( CVF ) curves are obtained to study the impact of traps on device performance. From the CVF curve, it is found that the existence of interface traps introduces a shift in capacitance along the gate voltage axis. These traps introduce the threshold voltage ( V TH ) shift. Furthermore, a detailed study of near-interface traps (NITs) is done based on tunneling mechanisms. For our investigation, the NITs are positioned at 0.5 nm, 1 nm, and 1.5 nm away from the AlGaN/GaN interface. The response of the NITs reduces the capacitance value in the accumulation region. The response of the NITs is explained through the capacitance charge model and border trap model. For NITs placed 0.5 nm away from the interface, the frequency dispersion in the accumulation region becomes evident. On the contrary, the dispersion reduces significantly, as the NITs goes deeper upto 1.5 nm. The results indicate that the NITs nearer to the interface respond to high frequencies. Further, the temperature dependent capacitance–voltage analysis is done for both interface and NITs, to understand the effect of temperature on frequency dispersion.
Background: Caesarean section is one of the most frequently performed surgeries in obstetrics. Optimal pain relief of the mother is possible with multimodal methods. Wound infiltration is one of the ...simplest and safe methods. The aim of the study was to compare the analgesic efficacy of wound infiltration of bupivacaine, with tramadol and bupivacaine mixture for postoperative pain. Materials and Methods: After obtaining Institutional Ethical Committee approval, 60 pregnant women of age group 18–35 years, undergoing elective caesarean section under spinal anaesthesia were included in the study. The patients were randomized into two groups of 30 each. Patients belonging to group B received bupivacaine 0.25% 0.7 mg/kg (diluted to 20 mL with normal saline), while those belonging to group T received tramadol 2 mg/kg mixed in bupivacaine 0.25% 0.7 mg/kg (diluted to 20 mL with normal saline). The time for first request of analgesia, numerical rating scale score, and cumulative consumption of diclofenac and tramadol in 24 h were compared. Results: The time for first request of analgesia in group T was 386.17 ± 233.84 min compared to group B which was 192.50 ± 134.77 (P < 0.0002). The total diclofenac consumption in the first 24 h was significantly reduced in group T when compared to group B (P < 0.0068). Conclusions: Subcutaneous wound infiltration with tramadol and bupivacaine prolongs the pain-free period and analgesic consumption after caesarean section, while it also enhances the patient satisfaction.
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