Tearing Research Articles

Simple techniques for atraumatic peritoneal dissection from the abdominal wall and for preventing peritoneal injury during trocar placement under retroperitoneoscopy.

Inadvertent peritoneal tearing causes pneumoperitoneum and makes retroperitoneal laparoscopic procedures technically more difficult. We describe some simple techniques of atraumatic peritoneal dissection and the prevention of peritoneal injury during trocar placement under retroperitoneoscopic guidance. After balloon dilation and the establishment of pneumoretroperitoneum a laparoscopic swab stick was used for peritoneal dissection from the abdominal wall under retroperitoneoscopic guidance. Exploratory puncture using a Cathelin (Terumo, Tokyo, Japan) needle was performed before trocar placement in close proximity to the lateral peritoneal reflection. We applied this technique in our last 10 consecutive retroperitoneal laparoscopic procedures. No peritoneal rents occurred during dissection of the lateral peritoneal reflection or trocar insertion. The laparoscopic swab stick technique described facilitates atraumatic peritoneal dissection as well as creation of an adequate working space. Exploratory puncture using a Cathelin needle is useful for preventing inadvertent peritoneal injury during trocar placement.

Clinical investigation of epipolis laser in situ keratomileusis on high myopia

To investigate the surgical characteristics and clinical results of Epi-LASIK on high myopia. Epi-LASIK was performed with a rotational epikeratome, which features a blunt oscillating blade. Corneal epithelial separation was achieved mechanically without the use of alcohol. Laser ablation was performed with Zeiss Mel-80 excimer laser. After ablation, epithelial sheet was repositioned and a therapeutic contact lens was applied to the eye for 3 to 5 days. The postoperative symptom, epithelial flap, contrast sensitivity, wavefront aberration and haze formation were investigated. The period of follow-up ranged from 3 to 6 months. 52 eyes of 30 patients with a mean spherical equivalent (SE) of (-12.82 +/- 4.38) D were included in the clinical trial. Among which 36 eyes were pathologic myopia and 16 eyes were simple high myopia. Patient age ranged from 20 to 50 years. Integrated epithelial flap with a diameter of 8 to 9 mm was made in 49 eyes leaving an about 3 mm superior hinge. Epithelial flap contained part of stroma tissue was seen in one eye. Free epithelial flap was made in 2 eyes. 4 eyes had moderate photophobia, tearing and foreign body sensation. Other patients only had mild discomfort. No patient reported other subjective symptom after 2 days with the exception of mild foreign body sensation. In 3 months after surgery, spherical equivalent of 44 eyes (84.61) were within +/- 1.00 D of attempted refraction. No eye lost more than one line of best spectacle-corrected visual acuity (BSCVA), whereas 10 eyes (19.23%) gained one or two lines of BSCVA. Grade 0.5 haze was found in 8 eyes (15.38%) and grade 1 haze was found in 2 eyes (3.84%). In 6 months after surgery, Grade 0.5 haze was found in 3 eyes. Contrast sensitivity decreased 1 month postoperatively and recovered to preoperative lever gradually 3 months postoperatively. Higher order aberration was increased postoperatively. Epi-LASIK is a safe and efficient method to correct high myopia with the advantages of having mild irritating symptom and haze. Larger series with adequate follow-up are needed to observe the long term clinical results and haze.

Deep Brain Stimulation for SUNCT

SUNCT (short-lasting, unilateral, neuralgiform headache attacks with conjunctival injection and tearing) is a rare primary headache disorder in the group of trigeminal autonomic cephalgia (e.g., cluster headache). It differs from cluster headache in that the pain is shorter (5–240 seconds), more frequent (3–200 episodes per day), and often triggered by mechanical stimulation in the trigeminal …

Stop tearing your hair out

Stop tearing your hair out

Avulsão indireta da epífise da crista ilíaca: uma rara lesão

A avulsão da cartilagem da crista ilíaca é uma lesão infreqüente e raramente é descrita na literatura. Atletas jovens e adolescentes são os indivíduos mais predispostos à lesão. O trauma indireto causado pela contração da musculatura aderida à crista ilíaca e o movimento de angulação do tronco em sentido oposto ao da contração é o mecanismo mais comum de arrancamento da cartilagem. Como na maioria dos casos não existe trauma direto, esses podem não ser diagnosticados se não considerarmos essa possibilidade de lesão. Relatamos dois casos atendidos em nosso Serviço, que apresentaram lesão na cartilagem devido a um trauma indireto (contração muscular abrupta). Ambos foram tratados de maneira incruenta, com excelente evolução.

Does Perineal Massage in Labor Prevent Trauma

Keeping the perineum intact during childbirth is important because perineal trauma can result in pain, dyspareunia, and fecal and urinary incontinence. The goal of perineal massage during the second stage of labor is to prevent tearing; these Australian authors designed a randomized, controlled trial to measure the effectiveness of this approach. Nulliparous and multiparous women with singleton pregnancies were recruited …

Low Temperature Effects on the Strength and Fracture Toughness of Membrane for LNG Storage Tank

Tensile and fracture toughness tests of the cold-rolled STS 304 steel plate for membrane material of LNG storage tank were performed at wide range of temperatures, 11 IK(boiling point of LNG), 153K , 193K and 293K(room temperature). Tensile strength significantly increases with a decrease in temperature, but the yield strength is relatively insensitive to temperature. Elongation at 193K abruptly decreases by 50% of that at 293K, and then decreases slightly in the temperature range of 193K to 111K. Strain hardening exponents at low temperatures are about four times as high as that at 293K. Elastic-plastic fracture toughness() and tearing modulus() tend to decrease with a decrease in temperature. The values are inversely related to effective yield strength in the temperature range of 111K to 293K. These phenomena result from a significant increase in the amount of transformed martensite in low temperature regions.

Effects of rubber content and temperature on ductile tearing stability in ABS materials

The material can fail by tearing instability when the elastic contraction is greater than the plastic extension due to crack growth. Tearing instability (TIS) theory developed by Paris and co-workers is applied to describe the effects of rubber content and temperature on the stability of ductile crack growth in ABS materials under impact test conditions. The increase in slope of the J–Δa (δ-Δa) curve, dJ/d(Δa) (dδ/d(Δa)), tearing modulus, T (TJ or Tδ) and JTJ with increasing rubber concentration indicates that higher rubber content is beneficial in maintaining crack growth stability. dJ/d(Δa), TJ and JTJ increase with increasing temperature until a certain temperature. After that they decrease with further increasing temperature. This is due to the embrittlement of SAN matrix close to its glass transition temperature. Materialversagen durch Tearing-Instabilitat kann eintreten, wenn die elastische Kontraktion groser als die plastische Deformation durch Riswachstum ist. Die von Paris und Mitarbeitern entwickelte Theorie der Tearing-Instabilitat wird zur Beschreibung der Einflusse von Kautschukgehalt und Temperatur auf die Stabilitat des duktilen Riswachstums in ABS unter Schlagbeanspruchung angewendet. Die Zunahme der Steigung der J-Δa(δ–Δa)-Kurve, dJ/d(Δa) (dδ/d(Δa)), des Tearingmoduls, T (TJ or Tδ) und JTJ mit steigender Kautschukkonzentration deutet darauf hin, das ein hoher Kautschukgehalt zum Erhalt der Riswachstumsstabilitat beitragt. dJ/d(Δa), TJ und JTJ nehmen mit steigender Temperatur bis zu einer bestimmten Temperatur zu. Danach nehmen sie mit weiter steigender Temperatur ab. Dies wird durch die Versprodung der SAN-Matrix in der Nahe der Glasubergangstemperatur verursacht.

And Still It Comes

like a downhill brakes-burned freight train full of pig iron ingots, full of lead life-sized statues of Richard Nixon, like an avalanche of smoke and black fog full of bent pins, the broken off tips of switch-blade knives, the dust of dried offal, remorseless, it comes, faster when you turn your back, faster when you turn to face it, like a fine rain, then colder showers, then downpour to razor sleet, then egg-sized hail, fist-sized, then jagged laser, shrapnel hail thudding and tearing like footsteps of drunk gods or fathers; it comes polite, loutish, assured, suave, breathing through its mouth (which is a hole eaten by a cave), it comes like an elephant annoyed, like a black mamba terrified, it slides down the valley, grease on grease, like fire eating birds' nests, like fire melting the fuzz off a baby's skull, still it comes: mute and gorging, never to cease, insatiable, gorging and mute.

Testing and Evaluation of Metal-Plate-Connected Wood Truss Joints

Abstract Five different types of metal-plate-connected (MPC) wood joints from a scissors truss were tested to evaluate their behavior. All joints were tested in a unique testing apparatus where in-plane loads along with moments were applied to simulate loads carried by the truss members. Strength, stiffness, and failure modes for bottom chord splice joints at web (BSJ), heel joints (HJ), crown joints (CJ), bottom chord ridge joints (BRJ), and top chord splice joints at web (TSJ) were reported. The average strengths of the BSJ, HJ, CJ, BRJ, and TSJ were 51 200 N, 49 800 N, 33 000 N, 52 300 N, and 43 100 N, respectively. The average values of the rotational stiffness were 245 440 kNmm/rad, 249 600 kNmm/rad, 103 700 kNmm/rad, and 33 800 kNmm/rad for BSJ, HJ, BRJ, and TSJ, respectively. Average transitional stiffness values were 61.7 kN/mm for BSJ, 29.2 kN/mm for HJ, and 40.2 kN/mm for BRJ. The majority of bottom chord joints failed in plate tearing, whereas top chord joints generally failed in a web member withdrawal mode. The joint stiffness data were used in a preliminary finite element (FE) analysis of the same truss, and the analytical results compared well to actual full-scale truss test results. Stiffness and strength data will be used in a future FE study.

Recent experience of penile fracture (1989-1993).

Penile fracture is an uncommon injury in the genitourinary organ which occurs following a blunt injury on the rigid penis. Penile fracture with urethral injury is even rarer. A total of 11 new patients with penile fracture were treated at our institution from 1989 to 1993. All of these injuries occurred during sexual intercourse and received immediate surgical repair to preserve the sexual function. Only one patient with complete transection of the urethra received end-to-end anastomosis of the urethra. Unfortunately, he suffered from urethral-cutaneous fistula ten days later. Suprapubic urinary diversion was performed in 3 patients with partial urethral tearing, and they enjoyed satisfactory outcomes during the limited follow-up. Immediate surgical repair of tunica albuginea is recommended for preserving penile function. If associated with partial urethral tear, suprapubic urinary diversion is sufficient to treat urethral lesions.

UNCONTROLLED TEARING SUPPRESSED BY TOPICAL SUPROFEN

UNCONTROLLED TEARING SUPPRESSED BY TOPICAL SUPROFEN

How to Stop Tearing Your Hair Out

How to Stop Tearing Your Hair Out

The sexed shape of Helminthosporium gramineum Rabh. fungus involved in increasing disease damage of torn leaves in barley

The onset of some sclerotic formations are reported on barley straws on which the following microscopic investigations and biometrical measurements peritecia, ascia and ascospores of Pyrenophora graminea (Rabh. Ito et Kurib.) were detected, representing the sexed multiplication of fungus Helminthosporium gramineum , the pathogenic factor causing leaf tearing in barley, a condition rarely encountered in nature. Owing to the great number of peritecia on barley straw residues, we are of the opinion that the sexed multiplication of fungus represents a real danger in barley cultivation assigning the efficient control steps against this pest.

Fast-time-scale plasma turbulence and the collisionless tearing mode

On considere l'effet d'une turbulence variant rapidement dans le temps dans un plasma de Langmuir magnetise sans collision sur le taux de croissance d'un mode de dechirure. On montre que dans des conditions typiques, le taux de croissance peut etre augmente

The Role of Texture on the Edge Tearing of Fabricated Products

Abstract Tensile tests were performed on both standard and circularly waisted aluminum sheet specimens. The alloy used, AA8007, is characterized by a fine grain size and a strong crystallographic texture. Simple crystallographic strain analysis could qualitatively predict the neck profile after the initiation of instability. The observed directionality of collar cracks in heat exchanger fin stock correlated well with the above analysis. Resume Les eprouvettes de feuille en alliage d'aluminum AA 8007 etaient utilisees dans les essais de traction sous la forme d'eprouvettes normales et d'eprouvettes a ceinture circulaire. L'alliage AA 8007 est caracterise d'un grosseur de grain finet d'une forte texture crystallographique.Une simpleanalysede tension crystallographique pourr ait predire qualitativement la configuration de la region de striction a la suite de l'initiation d'instabilite, La directionalite des criques de collet observee dans des ailettes d'echangeur de chaleur manifeste une bonne correlation au...

Viscoelasticity and Tearing Energy of Fluorinated Hydrocarbon Elastomers

Etude de 3 sortes de Viton (copolymer de fluorure de vinylidene et d'hexafluoro propylene) diversement reticules

Drift-Modified Tearing Instabilities Due to Trapped Electrons

It is shown that the collisional detrapping of magnetically trapped electrons in tokamaks can excite drift tearing modes with high azimuthal mode numbers. For normal temperature gradients ($\frac{d\mathrm{ln}{T}_{e}}{d\mathrm{ln}n}>0$), the modes are unstable in the collisional regime (${\ensuremath{\nu}}_{\mathrm{eff}}>{\ensuremath{\omega}}_{^{*}e}$), but stable in the collisionless regime (${\ensuremath{\nu}}_{\mathrm{eff}}<{\ensuremath{\omega}}_{^{*}e}$).

Broken beams

Broken beams

Technique to minimize tearing of plastic-carbon replicas

Technique to minimize tearing of plastic-carbon replicas