MOLECULAR BEAM DEFLECTION OF HIGH TEMPERATURE MOLECULES

Author Institution: Department of Chemistry Princeton University, Princeton; Department of chemistry, Harvard UniversityMolecular beams of $TiO_{2}$, $ZrO_{2}$, $TaO_{2}$, $CeO_{2}$, $ThO_{2}$, $UO_{2}$, and $SiO_{2}$ have been generated from Ta, W or Ir ovens at $2000-2600^{\circ} K$. The molecules pass through an electric quadrupole field and are then detected using a Weiss-type electron-bombardment ionizer with mass spectrometric selection of the $MO_{2}^{+}$ ions. In the electric quadrupole field, only molecules with permanent electric dipole moments are deflected toward the beam axis (refocusing). All the above dioxides except $SiO_{2}$ show appreciable refocusing behavior, indicating that they are probably bent in their ground electronic states. Beams of chemically unstable free radicals are produced by sampling reacting systems at steady state. Some preliminary studies have been performed on alkali-alkyl halide reactions

Ischial osteoid osteoma: A cause of persistent hip pain in an adolescent patient with bilateral femoroacetabular impingement.

A 15-year-old boy presented with left-sided hip pain and imaging consistent with the diagnosis of femoroacetabular impingement. Following hip arthroscopy, which included an osteochondroplasty, labral repair, and capsular repair, the patient's anterior hip pain improved. However, his deep aching hip pain persisted until an ischial osteoid osteoma was identified and treated with radiofrequency ablation. At 3 years follow-up, the patient reports high satisfaction and minimal pain. We present this case to illustrate the importance of considering all potential causes of persistent hip pain following hip arthroscopy, including benign bone tumors which may be difficult to visualize on plain radiographs

Arthroscopic Hip Capsule Reconstruction for Anterior Hip Capsule Insufficiency in the Revision Setting

Iatrogenic hip instability is increasingly recognized as a cause of persistent pain and disability after hip arthroscopy. Many authors currently advocate capsular repair to reduce postoperative instability. However, anatomic deficiencies in the anterosuperior capsule can prevent a functional capsular repair, particularly in the revision setting. Capsular reconstruction has been shown to restore biomechanical stabilization in cadaveric models and improve short-term patient outcomes in patients with primary hip arthroscopy failure. Arthroscopic hip capsular reconstruction is technically challenging, largely owing to complex suture management and difficulties with graft placement and sizing. This article describes the capsular reconstruction technique, detailing the technical aspects of anterosuperior capsular defect identification; capsular preparation; suture management; and dermal allograft sizing, preparation, and positioning

Therapeutic fascism: re-educating Communists in Nazi-occupied Serbia, 1942-44

This article probes the relationship between psychoanalysis and right-wing authoritarianism, and analyses a unique psychotherapeutic institution established by Serbia’s World War II collaborationist regime. The extraordinary Institute for compulsory re-education of high-school and university students affiliated with the Communist resistance movement emerged in the context of a brutal civil war and violent retaliations against Communist activists, but its openly psychoanalytic orientation was even more astonishing. In order to stem the rapid spread of Communism, the collaborationist state, led by its most extreme fascistic elements, officially embraced psychotherapy, the ‘talking cure’ and Freudianism, and conjured up its own theory of mental pathology and trauma – one that directly contradicted the Nazi concepts of society and the individual. In the course of the experiment, Serbia’s collaborationists moved away from the hitherto prevailing organicist, biomedical model of mental illness, and critiqued traditional psychiatry’s therapeutic pessimism