超声检测在糖厂榨辊轴环向裂纹检测中的应用

文章主要介绍对糖厂榨辊轴环向裂纹的超声检测,使用新的方法对环向裂纹深度作出判定,为企业生产决策提供有力支持。     

Surgical correction of aberrant conjunctival overgrowth in a rabbit: a case report

A dwarf rabbit presented with unilateral aberrant conjunctival growth. Allgoewer’s U-suture therapy was initially used to correct the overgrowth. Centrifugal incisions extending up to the limbus were made on the hypertrophic conjunctiva. Transpalpebral limbal fixation was performed next. When the symptoms recurred 3 weeks later, a second operation was performed using the Lembert suture method instead. The overgrowing membrane was excised radically just posterior to the limbus. The conjunctiva was then sutured using the Lembert pattern. The rabbit recovered with no further complications.     

Effect of end-taping and removal of sapwood on radial distribution of moisture content and tangential strains during radio-frequency/vacuum drying of <Emphasis Type="Italic">Cedrela sinsensis</Emphasis> log cross sections

This study was carried out to investigate the effects of end-taping of sapwood (ETS) and removal of sapwood (ROS) treatments of log cross sections on the radial distributions of moisture content (MC) and tangential strain, according to the circumferential slicing method (CSM), during radio-frequency/vacuum (RF/V) drying of log cross sections. The MC of control and ETS samples showed an even distribution around the center but decreased closer to the periphery side. In ROS samples, the MC decreased closer to the periphery side when above the hygroscopic range but showed an even distribution at the late stage of drying. Tangential strain in ETS samples showed slight compressive stress or tensile stress through the entire area of the cross section during the initial stage of drying, although the periphery side was in tensile stress from an area starting at a relative radius of 0.7. ROS samples showed tensile stress in the heartwood around the center and the heartwood of the periphery side and showed no stress or slight compressive stress in the middle area at the initial stage of drying, after which it showed an even distribution of tensile stress throughout the entire end surface. About 90% of the total checks contained in ETS and ROS samples were observed on the periphery side starting from a relative radius of 0.7.     

Management and Outcome of a Non-iatrogenic,Nearly Circumferential,Full-thickness Retroperitoneal Rectal Tear in a Horse

An 8-year-old Quarter Horse stallion presented to the Veterinary Teaching Hospital for evaluation of acute colic and a suspected rectal tear. Clinical examination revealed a nearly circumferential retroperitoneal full-thickness rectal tear. Exploratory laparotomy was performed, and medical management of the tear continued for 6 weeks. Multiple attempts at direct suturing of the tear were unsuccessful. Despite intensive medical management, the horse was not able to defecate, and the tear did not heal adequately, so the horse was humanely euthanized. Necropsy revealed complete obliteration of the muscular layers of the rectum with only a small area of rectal mucosa intact dorsally. There is limited information available on the management of circumferential rectal tears. Based upon this experience and other historical reports, a poor prognosis may be expected for circumferential full-thickness retroperitoneal rectal tears involving the ventral aspect of the rectum.     

Pull, lift and side force characteristics of cage wheels with opposing circumferential lugs

This study was aimed at finding the effect of a lug parameter that has been considered less important in improving the performance of cage wheels. This was the lug arrangement or configuration like a rubber tire on the cage wheels, called opposing circumferential lugs. The experiments were carried out in a laboratory soil bin with clay soil of 49% average soil moisture content and 135 kN average cone index. Cage wheels with opposing circumferential lugs at four levels of circumferential angle, 0°, 15°, 30° and 45°, were evaluated and their performance compared with normal cage wheels. The lug spacing and wheel slip of the test wheels were varied from 20°, 24°, 30° to 40° and from 25, 40 to 55%, respectively. All tests were conducted at a constant lug sinkage of 7 cm and at 20 rpm rotational speed of the wheel. The characteristics of three orthogonal force components produced by the cage wheels with opposing circumferential lugs were obtained by using a triaxial dynamometer. The pull and lift forces of the opposing lugs at circumferential angles of 15° and 30° were significantly higher than those of the normal lugs due to increase in the shear area in the corresponding direction, caused by the increase in lug length at larger circumferential angle. However, the wheel forces were drastically affected by the influence of the opposing circumferential lug interference at 45° circumferential angle. The better balancing of side forces could be obtained by increasing the circumferential angle and decreasing the lug spacing. The cage wheels with opposing circumferential lugs at 15° circumferential angle, 24° and 30° lug spacing gave superior performances as compared to other combinations.