Development of the CLAES instrument aperture door system

The design, assembly, and test processes followed in developing a space-qualified aperture door system are described. A blackbody calibration source is mounted inside the door, requiring the assembly to open and close a minimum of 150 cycles for instrument recalibration. Within the door system are four separate mechanisms, three of which are redundant; a pyro launch latch, a hinge bearing assembly, and a pair of pivot mechanisms. Decoupling devices within the pivot mechanisms allow an active drive unit to automatically overdrive a failed drive unit. The door is also stowable for possible Shuttle retrieval and re-entry. Illustrations and photographs of the flight hardware help acquaint the reader with the design. The aim is to pass on lessons learned in all phases of developing this spaceflight mechanism

Existence and computation of generalized Wannier functions for non-periodic systems in two dimensions and higher

Exponentially-localized Wannier functions (ELWFs) are a basis of the Fermi projection of a material consisting of functions which decay exponentially fast away from their maxima. When the material is insulating and crystalline, conditions which guarantee existence of ELWFs in dimensions one, two, and three are well-known, and methods for constructing the ELWFs numerically are well-developed. We consider the case where the material is insulating but not necessarily crystalline, where much less is known. In one spatial dimension, Kivelson and Nenciu-Nenciu have proved ELWFs can be constructed as the eigenfunctions of a self-adjoint operator acting on the Fermi projection. In this work, we identify an assumption under which we can generalize the Kivelson-Nenciu-Nenciu result to two dimensions and higher. Under this assumption, we prove that ELWFs can be constructed as the eigenfunctions of a sequence of self-adjoint operators acting on the Fermi projection. We conjecture that the assumption we make is equivalent to vanishing of topological obstructions to the existence of ELWFs in the special case where the material is crystalline. We numerically verify that our construction yields ELWFs in various cases where our assumption holds and provide numerical evidence for our conjecture.Comment: 71 pages, 15 figures. Added a new appendix where we prove that the uniform spectral gap assumption implies the existence of an analytic and periodic Bloch frame in the special case where the material is crystallin

Alien Registration- Stubbs, Mary D. (Bangor, Penobscot County)

https://digitalmaine.com/alien_docs/10546/thumbnail.jp

A Comparison of RF-DNA Fingerprinting Using High/Low Value Receivers with ZigBee Devices

The ZigBee specification provides a niche capability, extending the IEEE 802.15.4 standard to provide a wireless mesh network solution. ZigBee-based devices require minimal power and provide a relatively long-distance, inexpensive, and secure means of networking. The technology is heavily utilized, providing energy management, ICS automation, and remote monitoring of Critical Infrastructure (CI) operations; it also supports application in military and civilian health care sectors. ZigBee networks lack security below the Network layer of the OSI model, leaving them vulnerable to open-source hacking tools that allow malicous attacks such as MAC spoofing or Denial of Service (DOS). A method known as RF-DNA Fingerprinting provides an additional level of security at the Physical (PHY) level, where the transmitted waveform of a device is examined, rather than its bit-level credentials which can be easily manipulated. RF-DNA fingerprinting allows a unique human-like signature for a device to be obtained and a subsequent decision made whether to grant access or deny entry to a secure network. Two NI receivers were used here to simultaneously collect RF emissions from six Atmel AT86RF230 transceivers. The time-domain response of each device was used to extract features and generate unique RF-DNA fingerprints. These fingeprints were used to perform Device Classification using two discrimination processes known as MDA/ML and GRLVQI. Each process (classifier) was used to examine both the Full-Dimensional (FD) and reduced dimensional feature-sets for the high-value PXIe and low-value USRP receivers. The reduced feature-sets were determined using DRA for both quantitative and qualitative subsets. Additionally, each classifier performed Device Classification using a hybrid interleaved set of fingerprints from both receivers

An investigation of the edible and medicinal plants used by the Flathead Indians

Describes and lists the use of plants used by the Flathead Indians for medicine, foods, and toiletries

Summary of NASA landing-gear research

This paper presents a brief summary of the airplane landing gear research underway at NASA. The technology areas include: ground handling simulator, antiskid braking systems, space shuttle nose-gear shimmy, active control landing gear, wire brush skid landing gear, air cushion landing systems, tire/surface friction characteristics, tire mechanical properties, tire-tread materials, powered wheels for taxiing, and crosswind landing gear. This paper deals mainly with the programs on tire-tread materials, powered wheel taxiing, air cushion landing systems, and crosswind landing gear research with particular emphasis on previously unreported results of recently completed flight tests. Work in the remaining areas is only mentioned

Summary of NASA landing-gear research

Research relative to tire tread, powered-wheel taxiing, air cushion landing systems, and crosswind landing gear is discussed

Synthesis of Compounds Related to Fluoranthene

Part 1a. The known 4-methylfluoranthene and 4-phenylfluoranthene have been synthesised by condensation of methyl and phenyl vinyl ketones, or the corresponding Mannich bases, methyl 2-morpholinoethyl ketone and 2-diethylaminoethyl phenyl ketone respectively, with methyl fluorene-9-carboxylate, followed by hydrolysis and decarboxylation, reduction, cyclisation, and dehydrogenation. Unsuccessful attempts to evolve a new synthesis of methyl fluorene-9-carboxylate were made. Part lb. 1:2:5:6-Dibenzpyracylene was synthesised by a crossed Ullmann reaction between 4-iodofluoranthene and 2-bromonitrobenzene, followed by reduction, diazotisation, and ring-closure. An attempt at synthesis by the method described in Part la failed. The ultra-violet absorption spectrum is reported and discussed, especially in relation to Clar's Anellation Theory. Part 2. 2:3-Benzfluoranthene has been synthesised from o-diphenylenephthalide by Clar's zinc dust-zinc chloride fusion method. An attempt to synthesise 2:3-benzfluoranthene by cyclisation of 9-bromo-9-o-bromo-o-tolylfluorene gave a compound believed, in the light of spectrographic and analytical evidence, to be 1:9-diphenylanthracene. The spectrum of 2:3-benzfluoranthene is reported and discussed, especially in relation to the Anellation Theory. Part 3. 3:4-Dimethylfluoranthene was obtained by the Grignard reaction on 4-keto-3-methyl-1:2:3:4-tetra-hydrofluoranthene, followed by dehydration-dehydrogenation. 2-Methoxyfluoranthene was synthesised by a crossed Ullmann reaction between 1-iodo-2-methoxynaphthalene and o-bromonitrobenzene, followed by reduction, diazotisation, and ring-closure. Part 4. The ultra-violet absorption spectra of several mono-, di-, and trimethylfluoranthenes, methoxy-fluoranthenes, and 4-phenylfluoranthene, not previously recorded, have been measured. They are shown to be of value in characterisation of the pure compounds. Distortion due to overlapping of the substituent methyl- or methoxyl- group with a hydrogen atom in the 2- or 10- substituted derivatives appears to produce corresponding distortions in the ultraviolet absorption curve

Improved Healing of Pressure Ulcers Using Dermapulse, A New Electrical Stimulation Device

A double-blind, clinical study of pulsed electrical stimulation using the Dermapulse® device was carried out on 40 pressure ulcers, randomized to receive either active (stim) or sham treatment. Electrodes were placed over saline-moistened gauze on the ulcers. An electrical current of 35mA was delivered to the wound tissues at a frequency of 128 pulses per second. Polarity was negative until the wound debrided, then alternated from .positive to negative every three days. Ulcers were treated for 30 minutes twice daily for four weeks, after which sham patients could cross over to active treatment, and stim patients could continue active treatment. Ulcer healing was determined by measuring the length and width of the ulcer and calculating the L x W product. The same clinicians measured the ulcers each week, were kept blinded to treatment group, and were not the same persons who applied the treatment. Nine centers treated 40 ulcers (19 sham and 21 stim). Analysis of the characteristics of the patients, the ulcers, and concomitant wound care by both univariate and multivariate analyses showed comparability of the groups. After four weeks, the stim ulcers healed more than twice as much as the sham ulcers (49.8% vs. 23.4%; (p = 0.042). The stim ulcers healed 12.5% per week compared to 5.8% for the sham group. In the 15 crossover patients, four weeks of active stimulation caused nearly four times as much healing as their four weeks of sham treatment (47.9% vs. 13.4%; p = 0.012). By the last week of-active stimulation they had healed an average of 64%, and complete healing occurred in 40% of these ulcers after an average of nine weeks. Seventeen of the active treatment ulcers had extended therapy, and by their last week of treatment had healed an average of 75%. Forty-one percent of these ulcers healed completely after an average of 11.8 weeks. There were no significant safety problems identified