Side-grooved Charpy impact testing: Assessment of splitting and fracture properties of high-toughness plate steels.

The fracture properties and susceptibility to crack-divider delamination (or splitting) of three commercially produced high-toughness X70 pipeline steels are evaluated with Charpy impact test samples modified to incorporate side grooves. Temperature-dependent impact data are compared with standard Charpy V-notch (CVN) and drop weight tear test data (DWTT). It is shown that the modified geometry prevents the accumulation of plastic deformation at upper shelf energy temperatures and improves the accuracy of impact properties measurements. It also promotes splitting, mirroring the splitting behavior assessed with DWTT samples. To demonstrate the effects of splitting on fracture characteristics and impact energies, steels with similar tensile properties but different splitting susceptibilities are considered. Splitting severity is maximum close to the ductile-brittle transition temperature. However, the effect of splitting on impact energy is minimum at such temperature, as this type of delamination increases energy absorption at lower temperatures and decreases it by a similar extent at higher temperatures. This finding is discussed by examination of force-displacement curves from the instrumented impact tests.

Publisher Correction: Rapid Thermal Processing to Enhance Steel Toughness.

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

Rapid Thermal Processing to Enhance Steel Toughness.

Quenching and Tempering (Q&T) has been utilized for decades to alter steel mechanical properties, particularly strength and toughness. While tempering typically increases toughness, a well-established phenomenon called tempered martensite embrittlement (TME) is known to occur during conventional Q&T. Here we show that short-time, rapid tempering can overcome TME to produce unprecedented property combinations that cannot be attained by conventional Q&T. Toughness is enhanced over 43% at a strength level of 1.7 GPa and strength is improved over 0.5 GPa at an impact toughness of 30 J. We also show that hardness and the tempering parameter (TP), developed by Holloman and Jaffe in 1945 and ubiquitous within the field, is insufficient for characterizing measured strengths, toughnesses, and microstructural conditions after rapid processing. Rapid tempering by energy-saving manufacturing processes like induction heating creates the opportunity for new Q&T steels for energy, defense, and transportation applications.

Residency time, migration route and survival of Atlantic salmon Salmo salar smolts in a Canadian fjord.

Atlantic salmon Salmo salar smolts (n = 181) from two rivers were surgically implanted with acoustic transmitters and released to determine migration route, residency time and survival in a 50 km long estuarine fjord located on the south coast of Newfoundland, Canada. Data obtained from automated receivers placed throughout the Bay d'Espoir fjord indicated that migrating smolts used different routes to reach the outer areas of the fjord. The duration of time that smolts spent in the immediate estuary zone also differed between the two localities (7 and 17 days) although the total time smolts were resident in the fjord was similar and extensive (40 days). Many smolts were resident for periods of 4-8 weeks moving back and forth in the outer part of the fjord where maximum water depths range from 300 to 700 m. Survival in the estuary zone was greater for smolts with prolonged residency in estuarine habitat. Overall smolt survival to the fjord exit was moderately high (54-85%), indicating that the initial phase of migration did not coincide with a period of unusually high mortality.

Hyperacusis in Williams syndrome.

OBJECTIVE: To define hyperacusis in audiologic parameters and to further elucidate central and peripheral auditory pathways. DESIGN AND SETTING: Theories surrounding hyperacusis have always been highly debated. A group of children with Williams syndrome universally complain of hyperacusis. They have highly reproducible behavioural responses to noise and are thus hampered in their social interactions. Loss of inhibitory modulation to efferent sensory input to the cochlea is thought to be a possible mechanism. METHODS: Nine patients with Williams syndrome received a complete audiologic work-up, including audiogram, speech reception thresholds, acoustic reflexes, impedance, and transient evoked otoacoustic emissions (TEOAEs). MAIN OUTCOME MEASURES: Assessment of the efferent system is done by measuring changes in TEOAEs following stimulation of the contralateral ear. RESULTS: Three patients had high-frequency sensorineural hearing loss (SNHL) and thus, as expected, absent TEOAEs, indicating cochlear damage. Two had normal hearing and normal TEOAEs. However, four patients had normal hearing with absent TEOAEs. CONCLUSIONS: These findings are suggestive of cochlear disease and may, in fact, support the hypothesis of outer hair cell modulation by the ipsilateral medial olivocochlear system. Behavioural aspects of the syndrome make audiologic testing difficult. Thus, the diagnosis of SNHL may be hampered if it truly exists. The data show a preponderance of SNHL in the older age groups of our study population. This either reflects previously missed diagnoses or underlying cochlear disease, which may manifest later in life. Thus, this finding blurs the boundary between loudness recruitment and hyperacusis.

Congenital cervical teratoma in neonates. Case report and review.

Cervical teratomas are uncommon neoplasms. Although these lesions are histologically benign they are usually large and may cause airway obstruction. Cervical teratomas are usually diagnosed at birth. In-utero diagnosis is possible by prenatal ultrasound which assists in planning early airway management and surgical intervention. Mortality is significant but prognosis is good with airway control and complete surgical excision. However, pressure injury of contiguous structures can limit resectability and adversely affect outcome. Malignant cervical teratoma with metastasis has been reported mostly arising in adults with poor outcome. We present nine cases of neonatal cervical teratoma identified at two institutions between 1984 and 1996. One patient died before surgical intervention. All others underwent resection. There was one intraoperative death and one postoperative death. The remaining six patients did well postoperatively with no significant sequelae with 3 to 14 years follow-up.

Docetaxel administered on a weekly basis for metastatic breast cancer.

PURPOSE: To evaluate the safety and efficacy of weekly docetaxel in women with metastatic breast cancer. PATIENTS AND METHODS: Twenty-nine women were enrolled onto a study of weekly docetaxel given at 40 mg/m(2)/wk. Each cycle consisted of 6 weeks of therapy followed by a 2-week treatment break, repeated until disease progression or removal from study for toxicity or patient preference. Fifty-two percent of patients had been previously treated with adjuvant chemotherapy; 21% had received prior chemotherapy for metastatic breast cancer, and 31% had previously received anthracyclines. All patients were assessable for toxicity; two patients were not assessable for response but are included in an intent-to-treat analysis. RESULTS: Patients received a median of 18 infusions, with a median cumulative docetaxel dose of 720 mg/m(2). There were no complete responses. Twelve patients had partial responses (overall response rate, 41%; 95% confidence interval, 24% to 61%), all occurring within the first two cycles. Similar response rates were observed among subgroups of patients previously treated either with any prior chemotherapy or with anthracyclines. An additional 17% of patients had stable disease for at least 6 months. The regimen was generally well tolerated. There was no grade 4 toxicity. Only 28% of patients had any grade 3 toxicity, most commonly neutropenia and fatigue. Acute toxicity, including myelosuppression, was mild. Fatigue, fluid retention, and eye tearing/conjunctivitis became more common with repetitive dosing, although these side effects rarely exceeded grade 2. Dose reductions were made for eight of 29 patients, most often because of fatigue (n = 5). CONCLUSION: Weekly docetaxel is active in treating patients with metastatic breast cancer, with a side effect profile that differs from every-3-weeks therapy.

Phase I study of Doxil and vinorelbine in metastatic breast cancer.

BACKGROUND: Vinorelbine and Doxil (liposomal doxorubicin) are active chemotherapeutic agents in metastatic breast cancer. A phase I study was designed to evaluate combination therapy. PATIENTS AND METHODS: Thirty women with metastatic breast cancer were enrolled. Dose-limiting toxicity was determined through a dose escalation scheme, and defined for the first treatment cycle, only. Pharmacokinetic studies were performed during the first cycle of treatment. RESULTS: In the first cohort of Doxil 30 mg/m2 day 1 and vinorelbine 25 mg/m2 days 1 and 8, patients experienced severe neutropenia. Vinorelbine administration was changed thereafter to days 1 and 15 of each cycle. Dose limiting toxicity was observed at Doxil 50 mg/m2 and vinorelbine 25 mg/m2. Doxil 40 mg/m2 and vinorelbine 30 mg/m2 was defined as the maximally tolerated dose. Few toxicities (principally neutro penia) were seen at this dose level, with the notable absence of significant nausea, vomiting, or alopecia. Though 63% of patients had received prior anthracycline-based chemotherapy, only one patient developed grade 2 cardiac toxicity. Pharmacokinetic studies revealed prolonged exposure to high doxorubicin concentrations for several days following Doxil administration. CONCLUSIONS: Combination chemotherapy with Doxil and vinorelbine affords treatment with two active drugs in women with metastatic breast cancer, and appears to have a favorable toxicity profile. A schedule of Doxil 40 mg/m2 day 1 and vinorelbine 30 mg/m2 days 1 and 15 given every 28 days is recommended for phase II studies.

Nodular fasciitis in the parotid region of a child.

BACKGROUND: Nodular fasciitis is a common pathologic entity in the limbs of adults but rare in the head and neck of children. It is defined by the World Health Organization as a benign and probably reactive fibroblastic growth extending as a solitary nodule from superficial fascia into subcutaneous tissue. Treatment is local excision, and recurrence is rare. METHOD: Case Report RESULTS: A 3.5-year-old boy was initially seen with a 1-year history of gradually enlarging but otherwise asymptomatic right facial mass. On examination, a firm nodule was palpable anterior to the right ear, and facial movement was symmetrical. Computed tomography showed a rounded, well-defined solid mass continuous with the parotid fascia. The patient underwent superficial parotidectomy without complication. The pathology was reported as nodular fasciitis, and the child has had no clinical recurrence over 2 years. CONCLUSION: Benign lesions in this region in children may present similarly to malignancies but require much more-conservative treatment.

Tonsillectomy: indications for referral by family physicians versus indications for surgery by otolaryngologists.

OBJECTIVE: The purpose of this study was to compare reasons for family physician (FP) referral of children for tonsillectomy to the indications for this surgery used by otolaryngologists practising in the same region. METHOD: A checklist-type survey was sent to a random sample of 300 FPs and all of the practising otolaryngologists in Nova Scotia in the spring of 1995. RESULTS: There were significant differences between reasons for referral and indications for treatment in many areas, the most important of which was that over 60% of FPs referred cases because of parental insistence, while no surgeons operated for this reason. If inappropriate referrals are taken to be those for which no specialist intervention occurs, it appears that there is a significant number of referrals. CONCLUSION: These results suggest that both FPs and parents require information about these common paediatric problems.

Does a dedicated discharge coordinator improve the quality of hospital discharge?

OBJECTIVE: To evaluate the effectiveness of the role of a discharge coordinator whose sole responsibility was to plan and coordinate the discharge of patients from medical wards. DESIGN: An intervention study in which the quality of discharge planning was assessed before and after the introduction of a discharge coordinator. Patients were interviewed on the ward before discharge and seven to 10 days after being discharged home. SETTING: The three medical wards at the Homerton Hospital in Hackney, East London. PATIENTS: 600 randomly sampled adult patients admitted to the medical wards of the study hospital, who were resident in the district (but not in institutions), were under the care of physicians (excluding psychiatry), and were discharged home from one of the medical wards. The sampling was conducted in three study phases, over 18 months. INTERVENTIONS: Phase I comprised base line data collection; in phase II data were collected after the introduction of the district discharge planning policy and a discharge form (checklist) for all patients; in phase III data were collected after the introduction of the discharge coordinator. MAIN MEASURES: The quality and out come of discharge planning. Readmission rates, duration of stay, appropriateness of days of care, patients' health and satisfaction, problems after discharge, and receipt of services. RESULTS: The discharge coordinator resulted in an improved discharge planning process, and there was a reduction in problems experienced by patients after discharge, and in perceived need for medical and healthcare services. There was no evidence that the discharge coordinator resulted in a more timely or effective provision of community services after discharge, or that the appropriateness or efficiency of bed use was improved. CONCLUSIONS: The introduction of a discharge coordinator improved the quality of discharge planning, but at additional cost.